U.S. patent application number 12/180213 was filed with the patent office on 2008-12-25 for active magnetic refrigerator.
This patent application is currently assigned to DAEWOO ELECTRONICS CORPORATION. Invention is credited to Dong Kwan Lee, Seung Hoon Shin.
Application Number | 20080314049 12/180213 |
Document ID | / |
Family ID | 38309397 |
Filed Date | 2008-12-25 |
United States Patent
Application |
20080314049 |
Kind Code |
A1 |
Shin; Seung Hoon ; et
al. |
December 25, 2008 |
Active Magnetic Refrigerator
Abstract
An active magnetic refrigerator includes separated hot and cold
heat exchange units wherein a heat transfer fluid that exchanges a
heat with a magnetic heat exchange unit having the magnetocaloric
material pieces arranged to have a gap therebetween separately
circulates through a solenoid valve.
Inventors: |
Shin; Seung Hoon; (Seoul,
KR) ; Lee; Dong Kwan; (Seoul, KR) |
Correspondence
Address: |
EDELL, SHAPIRO & FINNAN, LLC
1901 RESEARCH BOULEVARD, SUITE 400
ROCKVILLE
MD
20850
US
|
Assignee: |
DAEWOO ELECTRONICS
CORPORATION
Seoul
KR
|
Family ID: |
38309397 |
Appl. No.: |
12/180213 |
Filed: |
July 25, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/KR2006/004714 |
Nov 10, 2006 |
|
|
|
12180213 |
|
|
|
|
Current U.S.
Class: |
62/3.1 |
Current CPC
Class: |
F25B 21/00 20130101;
F25B 2321/002 20130101; Y02B 30/00 20130101; Y02B 30/66 20130101;
F25B 2321/0022 20130101 |
Class at
Publication: |
62/3.1 |
International
Class: |
F25B 21/00 20060101
F25B021/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 27, 2006 |
KR |
1020060008730 |
Mar 6, 2006 |
KR |
1020060020868 |
Claims
1. An active magnetic refrigerator, comprising: first and second
heat exchange units including a magnetocaloric material for passing
a flow of a heat transfer fluid; a magnet unit for applying a
magnetic field to one of the first heat exchange unit and the
second heat exchange unit or erasing the magnetic field from the
first heat exchange unit or the second heat exchange unit; a hot
heat exchanger for coupled to the first heat exchange unit and the
second heat exchange unit for a circulation; a cold heat exchanger
for coupled to the first heat exchange unit and the second heat
exchange unit for the circulation; a first solenoid valve for
directing a first heat transfer fluid exhausted from the hot heart
exchanger to one of the first heat exchange unit and the second
heat exchange unit having the magnetic field applied thereto; and a
second solenoid valve for directing a second heat transfer fluid
exhausted from the cold heart exchanger to one of the second heat
exchange unit and the first heat exchange unit having the magnetic
field erased therefrom.
2. The refrigerator in accordance with claim 1, wherein the magnet
unit comprises a first electromagnet attached to the first heat
exchange unit, and a second electromagnet attached to the second
heat exchange unit.
3. The refrigerator in accordance with claim 1, wherein the magnet
unit comprises a permanent magnet and a permanent magnet conveying
member for moving the permanent magnet to one of the first heat
exchange unit and the second heat exchange unit.
4. The refrigerator in accordance with claim 3, wherein the
permanent magnet conveying member comprises a yoke having the
permanent magnet disposed at both sides thereof, and a
reciprocation transfer member for reciprocating of the yoke.
5. The refrigerator in accordance with claim 4, wherein the
reciprocation transfer member comprises a rack attached to the
yoke, a pinion engaged with the rack, and a motor for transferring
a rotational power to the pinion.
6. The refrigerator in accordance with claim 1, wherein the magnet
unit comprises a magnet and a magnet rotating assembly for rotating
the magnet, and further comprising a plurality of mounting parts
for mounting the first heat exchange unit and the second heat
exchange unit, the mounting part being disposed on a rotational
plane of the magnet, a through-hole having the magnet rotating
assembly mounted at a center thereof, and a table for constituting
a connecting path for connecting the heat exchangers and the
magnetic heat exchange units.
7. The refrigerator in accordance with claim 6, wherein the
connecting path of a portion at a crossing of the first heat
transfer fluid and the second heat transfer fluid comprises a
tunnel and a bridge.
8. The refrigerator in accordance with claim 7, wherein the magnet
rotating assembly comprises a flange supporting the magnet disposed
upper and lower sides of one of the first heat exchange unit and
the second heat exchange unit, a yoke consisting of a web
connecting the flange, and a rotational power transfer member for
transferring a rotational power to the yoke.
9. The refrigerator in accordance with claim 1, wherein the first
heat exchange unit comprises a first case including the
magnetocaloric material, an upper inlet port and an upper outlet
port disposed on an upper surface of the first case, and an lower
inlet port and an lower outlet port disposed on an lower surface of
the first case, and wherein the second heat exchange unit comprises
a second case including the magnetocaloric material, an upper inlet
port and an upper outlet port disposed on an upper surface of the
second case, and a lower inlet port and a lower outlet port
disposed on a lower surface of the second case.
10. The refrigerator in accordance with claim 9, wherein the
magnetocaloric material comprises a plurality of magnetocaloric
material pieces disposed in the first case or the second case, the
plurality of magnetocaloric material pieces have a gap
therebetween.
11. The refrigerator in accordance with claim 10, wherein each of
the plurality of magnetocaloric material pieces comprises a
gadolinium plate.
12. The refrigerator in accordance with claim 10, wherein each of
the plurality of magnetocaloric material pieces comprises a
gadolinium rod having a constant circular cross-section in the
lengthwise direction.
13. The refrigerator in accordance with claim 12, wherein the
gadolinium rod comprises a groove in the lengthwise direction.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/KR2006/004714, filed on Nov. 10, 2006, entitled
"Active Magnetic Refrigerator," which claims priority under 35
U.S.C. .sctn.119 to Application No. KR 10-2006-0008730 filed on
Jan. 27, 2006, entitled "Active Magnetic Refrigerator," and
Application No. KR 10-2006-0020868 filed on Mar. 6, 2006, entitled
"Active Magnetic Refrigerator," the entire contents of which are
hereby incorporated by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to an active magnetic
refrigerator comprising separated hot and cold heat exchange units
wherein a heat transfer fluid that exchanges a heat with a magnetic
heat exchange unit having the magnetocaloric material pieces
arranged to have a gap therebetween separately circulates through a
solenoid valve.
BACKGROUND
[0003] A conventional active magnetic refrigerator is disclosed in
U.S. Pat. No. 6,826,915. As shown in FIG. 1, (a) a temperature of a
magnetic refrigerant material which has a magnetic field applied
thereto as a magnet moves to a right increases from a dotted line
to a solid line. (b) The temperature of the magnetic refrigerant
material drops from the dotted line to the solid line as a heat
transfer fluid at a cold side moves to a hot side, and the heat
transfer fluid is gradually heated to be hot at a right outlet,
thereby emitting heat by an heat exchange with the hot side. (c)
The temperature of the magnetic refrigerant material which has a
magnetic field erased as the magnet moves to a left decreases more
from the dotted line to the solid line. (d) Due to the movement of
the heat transfer fluid from the hot side to the cold side, the
magnetic refrigerant material is heated from the temperature of the
dotted line to that of the solid line, and the heat transfer fluid
is relatively cooled to be cold at a left outlet, thereby absorbing
heat from the cold side to cool the cold side.
[0004] As shown in FIGS. 2 and 3, in accordance with the
conventional shuttle type active magnetic regenerator including the
above-described cycle, a temperature of the heat transfer fluid
heated in a first heat exchange unit 10A in the magnetic field is
dropped to an atmospheric temperature by a hot-side heat exchanger
70 and the heat transfer fluid is then passed through the second
heat exchange unit 10B. At the same time, since the second heat
exchange unit 10B is outside the magnetic field, a magnetic
refrigerant material 16 has a low temperature, the temperature of
the heat transfer fluid drops while passing through the magnetic
refrigerant material layer 16. The heat transfer fluid having the
low temperature passes through a cold-side heat exchanger 60 and
then enters the first heat exchange unit 10A to be heated. The heat
transfer fluid then flows to the hot-side heat exchanger 70, the
second heat exchange unit 10B and the cold-side heat exchanger 60
to complete the one cycle.
[0005] Contrarily, when the second heat exchange unit 10B is moved
to a magnet circuit 22 by a movable mechanism 24, a channel switch
30 reverses the flow of the heat transfer fluid to generate a
reverse cycle.
[0006] A disadvantage of the conventional shuttle type active
magnetic refrigerator is that a single heat transfer fluid
circulates two magnetic heat exchange units 10A and 190B to serve
as the hot side and the cold side simultaneously such that the heat
exchange efficiency is degraded. For instance, when the magnet
circuit 22 switched from the first magnetic heat exchange unit 10A
to the second magnetic heat exchange unit 10B, the channel switch
30 operates. At the same time, the first magnetic heat exchange
unit 10A moves out of the magnetic field so that the temperature of
the magnetocaloric material 16 drops rapidly. When the temperature
drops, a coolant having the atmospheric temperature that has passed
through the hot-side heat exchanger 70 should pass the first
magnetic heat exchange unit 10A in order to be effected by the
rapidly cooled temperature. However, the heat transfer fluid having
a high temperature that has not passed through the hot-side heat
exchanger 70 is reversely circulated by the channel switch 30 to be
returned to the AMR bed 10. Therefore, the effect of the cooling is
hardly obtained.
[0007] As shown in FIG. 3, since the magnetic heat exchange unit 10
comprises the inlet/outlet ports 18a and 18b of the heat transfer
fluid, the heat transfer fluid having the hot temperature in the
magnetic heat exchange unit cannot be exhausted due to the reverse
circulation when the channel switch 30 is in operation, thereby
degrading the heat exchange efficiency.
[0008] In addition, since the conventional active magnetic
refrigerator employs the single heat transfer fluid, an amount of
the heat transfer fluid passing through the hot side cannot be
controlled, and a heat of the magnetocaloric material 16 cannot be
cooled promptly, resulting in a degradation of the heat exchange
efficiency.
[0009] In addition, since a fine mesh 16 is used at the outlet port
in order to prevent a problem that the magnetocaloric material 16
of a power type is lost by the heat transfer fluid (coolant), the
coolant cannot be circulated smoothly.
[0010] Moreover, since the coolant continues to pass the
magnetocaloric material 16 at the same spot, a smooth heat exchange
is difficult.
[0011] In addition, the magnetocaloric material 16 having a
microscopic size may be lost when the coolant enters or exits the
magnetic heat exchange unit 10.
[0012] A conventional rotation magnetic refrigerator is disclosed
in U.S. Pat. No. 6,668,560. As shown in FIGS. 4 and 5, in
accordance with the conventional rotation magnetic refrigerator,
while a heat transfer fluid 17 entering into a cold side inlet port
22 through a cold side inlet port pipe 21 flows to a hot side
outlet port 34, the heat transfer fluid 17 absorbs a heat generated
by a magnetocaloric effect of a magnetocaloric material 12 having a
magnetic field applied thereto and exits to a hot side outlet port
pipe 33 through a hot side outlet port ports 34 to cool the
magnetocaloric material 12. A hot side sequentially passes the hot
side outlet port pipe 33, a valve 71, a pump 60, and a hot heat
exchanger 62 and flows into a magnetic heat exchange compartment
13. In a hot side inlet port pipe 31, the hot side is divided into
the hot side inlet port pipe 31 and a cold side outlet port 23, and
meets a cold side at a cold side outlet port pipe 24 and proceed to
a valve 74. When the hot side moves from a hot side inlet port 32
to the cold side outlet port pipe 24, the hot side is cooled by
passing the magnetocaloric material 12 already cooled by the hot
side. The cold side that has passed through the valve 74 passes a
cold heat exchanger 63 and flows to pipes 83 and 21 to repeat a
cycle (a detailed description is omitted. See U.S. Pat. No.
6,668,560 for omitted reference numerals).
[0013] As described above, since the conventional rotation magnetic
refrigerator comprises twelve magnetic heat exchange compartments,
four valves 71, 72, 73 and 74 and more than 24 pipes, it is
difficult to manufacture the conventional magnetic
refrigerator.
[0014] Moreover, since the single heat transfer fluid is circulated
to serve as the hot side and the cold side simultaneously. As shown
in FIG. 5, the heat transfer fluid enters the hot-side through the
hot side inlet port 32 and cooled by passing through the cooled the
magnetocaloric material to exit through the cold side inlet port 24
resulting in the degradation of the heat exchange efficiency. At
this time, when the heat transfer fluid having a temperature lower
than that of the hot side injected into the hot side inlet port 32
enters the hot side inlet port 32 and passes through the cooled
magnetocaloric material, the heat transfer fluid having a lower
temperature may be obtained at the cold side inlet port 24
resulting in an improvement of the heat exchange efficiency.
[0015] In addition, since the conventional active magnetic
refrigerator employs the single heat transfer fluid, the amount of
the heat transfer fluid passing through the hot side cannot be
controlled, and a heat of the magnetocaloric material cannot be
cooled promptly, resulting in a degradation of the heat exchange
efficiency.
SUMMARY
[0016] It is an object of the present invention to provide an
active magnetic refrigerator wherein a hot side and a cold side is
dividedly circulated to provide a high heat exchange efficiency and
to control an mount of the heat transfer fluid.
[0017] In order to achieve the above-described object, there is
provided an active magnetic refrigerator, comprising: first and
second heat exchange units including a magnetocaloric material for
passing a flow of a heat transfer fluid; a magnet unit for applying
a magnetic field to one of the first heat exchange unit and the
second heat exchange unit or erasing the magnetic field from the
first heat exchange unit or the second heat exchange unit; a hot
heat exchanger for coupled to the first heat exchange unit and the
second heat exchange unit for a circulation; a cold heat exchanger
for coupled to the first heat exchange unit and the second heat
exchange unit for the circulation; a first solenoid valve for
directing a first heat transfer fluid exhausted from the hot heart
exchanger to one of the first heat exchange unit and the second
heat exchange unit having the magnetic field applied thereto; and a
second solenoid valve for directing a second heat transfer fluid
exhausted from the cold heart exchanger to one of the second heat
exchange unit and the first heat exchange unit having the magnetic
field erased therefrom.
[0018] In accordance with the refrigerator, a hot side and a cold
side is dividedly circulated to provide a high heat exchange
efficiency and to control an amount of the heat transfer fluid.
[0019] It is preferable that the magnet unit comprises a first
electromagnet attached to the first heat exchange unit, and a
second electromagnet attached to the second heat exchange unit.
[0020] In addition, when the magnet unit comprises a permanent
magnet and a permanent magnet conveying member for moving the
permanent magnet to one of the first heat exchange unit and the
second heat exchange unit, a use of the plurality of the magnetic
heat exchange units is possible with a single magnet unit.
[0021] It is preferable that the permanent magnet conveying member
comprises a yoke having the permanent magnet disposed at both sides
thereof, and a reciprocation transfer member for reciprocating of
the yoke, wherein The refrigerator in accordance with claim 4,
wherein the reciprocation transfer member comprises a rack attached
to the yoke, a pinion engaged with the rack, and a motor for
transferring a rotational power to the pinion.
[0022] On the other hand, it is preferable that the magnet unit
comprises a magnet and a magnet rotating assembly for rotating the
magnet, and the refrigerator further comprises a plurality of
mounting parts for mounting the first heat exchange unit and the
second heat exchange unit, the mounting part being disposed on a
rotational plane of the magnet, a through-hole having the magnet
rotating assembly mounted at a center thereof, and a table for
constituting a connecting path for connecting the heat exchangers
and the magnetic heat exchange units.
[0023] It is preferable that the connecting path of a portion at a
crossing of the first heat transfer fluid and the second heat
transfer fluid comprises a tunnel and a bridge.
[0024] It is also preferable that the magnet rotating assembly
comprises a flange supporting the magnet disposed upper and lower
sides of one of the first heat exchange unit and the second heat
exchange unit, a yoke consisting of a web connecting the flange,
and a rotational power transfer member for transferring a
rotational power to the yoke.
[0025] When the first heat exchange unit comprises a first case
including the magnetocaloric material, an upper inlet port and an
upper outlet port disposed on an upper surface of the first case,
and an lower inlet port and an lower outlet port disposed on an
lower surface of the first case, and the second heat exchange unit
comprises a second case including the magnetocaloric material, an
upper inlet port and an upper outlet port disposed on an upper
surface of the second case, and an lower inlet port and an lower
outlet port disposed on an lower surface of the second case, the
cold side and the hot side is completely divided as to improve the
heat exchange efficiency.
[0026] It is preferable that the magnetocaloric material comprises
a plurality of magnetocaloric material pieces disposed in the first
case or the second case, the plurality of magnetocaloric material
pieces have a gap therebetween so that a mesh may not be used for a
smooth flow of the heat transfer fluid.
[0027] It is preferable that each of the plurality of
magnetocaloric material pieces comprises a gadolinium plate or a
gadolinium rod having a constant circular cross-section in the
lengthwise direction.
[0028] When the gadolinium rod comprises a groove in the lengthwise
direction, a contact area is increased more resulting in an
improvement of the heat exchange efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] FIG. 1 is a diagram illustrating a concept of an active
magnetic refrigerator.
[0030] FIG. 2 is a diagram illustrating a configuration of a
conventional active magnetic refrigerator.
[0031] FIG. 3 is a cross-sectional view illustrating a magnetic
heat exchange unit for the active magnetic refrigerator of FIG.
2.
[0032] FIG. 4 is a plan view illustrating a heat transfer fluid in
another conventional active magnetic refrigerator.
[0033] FIG. 5 is a plan view exemplifying a magnetic heat exchange
unit including a magnetocaloric material of a powder type of FIG.
4.
[0034] FIG. 6 is a configuration diagram illustrating a magnetic
refrigerator in accordance with a first preferred embodiment of the
present invention.
[0035] FIG. 7 is a plan view illustrating a magnet unit for the
active magnetic refrigerator of FIG. 6.
[0036] FIG. 8 is a perspective view illustrating an exterior of the
magnetic heat exchange unit for the active magnetic refrigerator of
FIG. 6.
[0037] FIG. 9 is a cross-sectional view of the magnetic heat
exchange unit in accordance with the first preferred embodiment of
the present invention taken along a line B-B of FIG. 8.
[0038] FIGS. 10 through 12 are cross-sectional views of the
magnetic heat exchange unit in accordance with another alternative
example taken along a line B-B of FIG. 8.
[0039] FIG. 13 is a perspective view illustrating a magnetocaloric
material having a shape of a rod having a groove in a lengthwise
direction.
[0040] FIGS. 14 and 15 are plan views illustrating a cycle of a
heat transfer fluid according to a position of a magnet in
accordance with an active magnetic refrigerator in accordance with
a second preferred embodiment of the present invention.
[0041] FIG. 16 is a plan view illustrating the cycle of FIGS. 14
and 15 as one.
[0042] FIG. 17 is a schematic diagram illustrating a magnet
rotating assembly.
[0043] FIGS. 18 and 19 are a perspective view and a partially
magnified view of a table having a flow path.
DETAILED DESCRIPTION
[0044] The above-described objects and other objects and
characteristics and advantages of the present invention will now be
described in detail with reference to the accompanied drawings.
First Embodiment
[0045] FIG. 6 is a configuration diagram illustrating a magnetic
refrigerator in accordance with a first preferred embodiment of the
present invention, FIG. 7 is a plan view illustrating a magnet unit
for the active magnetic refrigerator of FIG. 6, and FIG. 8 is a
perspective view illustrating an exterior of the magnetic heat
exchange unit for the active magnetic refrigerator of FIG. 6.
[0046] As shown in FIGS. 6 through 8, the active magnetic
refrigerator in accordance with the preferred embodiment of the
present invention comprises a first magnetic heat exchange unit
113A and a second magnetic heat exchange unit 113B including a
magnetocaloric material, a magnet unit 140 for applying a magnetic
field to the first magnetic heat exchange unit 113A and the second
magnetic heat exchange unit 113B or erasing the magnetic field
therefrom, a hot heat exchanger 162, a cold heat exchanger 163, a
first solenoid valve 120a and a second solenoid valve 120b.
[0047] The heat transfer fluid is divided into a first heat
transfer fluids 17aa and 17ab circulating in the hot heat exchanger
162, and a second heat transfer fluids 17bb and 17bc circulating in
the cold heat exchanger 163 to form a cycle.
[0048] The first solenoid valve 120a is a 3-port 2-way solenoid
valve for redirecting the first heat transfer fluid 17aa of a cold
side flowing in a tube 130 of the hot heat exchanger 162 to a tube
131a through the first magnetic heat exchange unit 113A or to a
tube 131b through the second magnetic heat exchange unit 113B such
that the first heat transfer fluid 17aa flows in a tube 131.
[0049] That is, the first solenoid valve 120a is disposed at a
junction wherein the tube 130 is divided into tubes 130a and 130b
connected to the first magnetic heat exchange unit 113A and the
second magnetic heat exchange unit 113B.
[0050] Similarly, the second solenoid valve 120b is the 3-port
2-way solenoid valve for redirecting the second heat transfer fluid
17bc of a hot side flowing in a tube 132 of the cold heat exchanger
163 to a tube 133a through the second magnetic heat exchange unit
113B or to a tube 133b through the first magnetic heat exchange
unit 113A such that the second heat transfer fluid 17bc flows in a
tube 133.
[0051] That is, the second solenoid valve 120b is disposed at a
junction wherein the tube 132 is divided into tubes 132a and 132b
connected to the second magnetic heat exchange unit 113B and the
first magnetic heat exchange unit 113A.
[0052] As described above, since the first heat transfer fluids
17aa and 17ab of the hot side and the second heat transfer fluids
17bb and 17bc of the cold side is dividedly circulated as two
cycles, a larger amount of the heat transfer fluid may be flown to
the hot side by controlling an amount thereof to improve a heat
exchange efficiency.
[0053] Moreover, it is preferable that the flow of the first heat
transfer fluids 17aa and 17ab and the second heat transfer fluids
17bb and 17bc is generated by pumps 160 and 161.
[0054] That is, as shown in FIG. 6, the hot heat exchange
circulating member and the cold heat exchange circulating member
embodies a closed cycle similar to a closed circuit. Therefore,
since an atmospheric pressure does not act on the heat transfer
fluid directly, almost no resistance is applied to the pumps 160
and 161, thereby reducing a time required for the heat exchange and
improving the heat exchange efficiency.
[0055] The first magnetic heat exchange units 113A and 113B
includes a magnetocaloric material 112 for passing the flow of the
heat transfer fluid. The magnetocaloric material 112 comprises a
gadolinium (Gd) of a fine powder type. The gadolinium has pores
having a high osmosis to the flow of the heat transfer fluid, and a
superior absorption and emission of a heat.
First Alternative Example
Magnetic Heat Exchange Unit 113
[0056] As shown in FIGS. 8 and 9, a magnetic heat exchange unit 113
of the first alternative example a case 115 extending vertically,
and a plurality of magnetocaloric material pieces 112 disposed in
the case 115 to form a gap 114 therebetween.
[0057] Ports 115a and 116b are disposed on a top surface of the
case 115, and ports 115b and 116a are disposed on a bottom surface
of the case 115.
[0058] When the case 115 is the first magnetic heat exchange unit
113A, the ports 115a and 116b are connected to the tubes 130a and
133b, and the ports 115b and 116a are connected to the tubes 131a
and 132b.
[0059] When the case 115 is the second magnetic heat exchange unit
113B, the ports 115a and 116b are connected to the tubes 130b and
133a, and the ports 115b and 116a are connected to the tubes 131b
and 132a.
[0060] The case 115 may be manufactured by arranging and mounting
the plurality of magnetocaloric material pieces 112 while the case
115 is disassembled in two parts, and then assembling, bonding or
welding the parts.
[0061] The case 115 in accordance with the embodiment may be
connected to the tube by the ports 115a and 116b and the ports 115b
and 116a to be supported. The support improves the heat exchange
efficiency by establishing an adiabatic state wherein the plurality
of magnetocaloric material pieces 112 of the magnetic heat exchange
unit 113 is not exposed.
[0062] The magnetocaloric material 112, which have a shape of a
plate manufactured from a gadolinium powder, are disposed in the
case 115 in parallel such that the gap 114 prevents a contact
therebetween. The plurality of magnetocaloric material pieces 112
of the gadolinium plate may be a thin foil or a thick sheet
according to a flow velocity and a heat exchange rate of the heat
transfer fluid.
[0063] As described above, the plurality of magnetocaloric material
pieces 112 having the gap 114 therebetween prevents the loss of the
material even when a mesh is not used, a contact with the entirety
of the plurality of magnetocaloric material pieces 112 as well as a
smooth flow is obtained since the heat transfer fluid flows through
the gap 114, and a higher heat exchange rate compared to that of
the conventional art is obtained since a contact area is larger in
case of the gadolinium plate.
Second Alternative Example
Magnetic Heat Exchange Unit 213
[0064] As shown in FIG. 10, the magnetic heat exchange unit 213 in
accordance with the second alternative example comprises a
plurality of magnetocaloric material pieces 212 having a shape of a
rod instead of the plurality of magnetocaloric material pieces 112
having the shape of the plate. That is, each of the plurality of
magnetocaloric material pieces 212 has the shape of the rod having
a constant circular cross-section in the lengthwise direction.
[0065] A gap 214 between the plurality of magnetocaloric material
pieces 212 having the shape of the rod is formed when in contact or
not in contact due to the circular cross-section even when the
plurality of magnetocaloric material pieces 212 are randomly
arranged such that an effect of the first alternative example is
obtained when the heat transfer fluid flows through the gap
214.
[0066] It is preferable that the plurality of magnetocaloric
material pieces 212 having the shape of the rod arranged vertically
are tied as one to be inserted in a batch.
[0067] On the other hand, as shown in FIG. 13, it is preferable
that the plurality of magnetocaloric material pieces 212 having the
shape of the rod comprises a groove 212a in a lengthwise direction
to increase the contact area with the heat transfer fluid, thereby
improving the heat exchange efficiency.
Third Alternative Example
Magnetic Heat Exchange Unit 313
[0068] As shown in FIG. 11, the magnetic heat exchange unit 313 in
accordance with the third alternative example comprises a plurality
of magnetocaloric material pieces 312 having the shape of the rod
arranged to have a gap 314 therebetween similar to the plurality of
magnetocaloric material pieces 112 having the shape of the plate of
the first alternative example instead of a random arrangement of
the plurality of magnetocaloric material pieces 212 having the
shape of the rod of the second alternative example.
[0069] It is preferable that the plurality of magnetocaloric
material pieces 312 having the shape of the rod arranged vertically
are tied as one to be inserted in a batch.
[0070] As shown in FIG. 13, it is preferable that the plurality of
magnetocaloric material pieces 312 having the shape of the rod
comprises the groove 212a in the lengthwise direction.
Fourth Alternative Example
Magnetic Heat Exchange Unit 413
[0071] As shown in FIG. 12, the magnetic heat exchange unit 413 in
accordance with the fourth alternative example comprises a
magnetocaloric material piece 412a having the shape of the rod and
a magnetocaloric material piece 412b having the shape of the plate
combined to have a gap 414 therebetween.
[0072] The magnet unit 140 may be attached to the magnetic heat
exchange unit 113.
[0073] Similar to the first embodiment, the magnet unit 140 may
comprise a permanent magnet 141 disposed at both sides of the first
magnetic heat exchange unit 113A or the second magnetic heat
exchange unit 113B, and a permanent magnet conveying member for
moving the permanent magnet 141 between the first magnetic heat
exchange unit 113A and the second magnetic heat exchange unit 113B,
or may comprises an electromagnet (not shown) attached to the first
magnetic heat exchange unit 113A and the second magnetic heat
exchange unit 113B to apply or erase the magnetic field. In
addition, the magnet unit that is pushed toward or pulled away from
(vertical to a paper surface of FIG. 7) the first magnetic heat
exchange unit 113A and the second magnetic heat exchange unit 113B
may be embodied.
[0074] As shown in FIG. 7, the permanent magnet conveying member
comprises a yoke 143 having the permanent magnet 141 disposed at
both sides thereof, and a reciprocation transfer member for
carrying out a reciprocation of the yoke 143.
[0075] The yoke 143 serves to concentrate the magnetic field of the
permanent magnet 141 in a direction of the magnetic heat exchange
unit 113 so that the magnetic field having a higher intensity is
applied to the magnetic heat exchange unit.
[0076] The reciprocation transfer member may be embodied with a
rack 145 attached to the yoke 143, a pinion 147 engaged with the
rack 145, and a motor 149 a shaft of which transfers a rotational
power to the pinion 147. The rack 145 may be embodied by forming a
tooth on a rod of a link of the yoke 143 or welding a separate rack
to the rod.
[0077] It will be understood by those skilled in the art that
various reciprocation transfer members that convert a rotational
motion to a linear motion may be used in accordance with the
present invention.
[0078] While FIG. 6 illustrates a case wherein the first magnetic
heat exchange unit 113A and the second magnetic heat exchange unit
113B are disposed in parallel in order to show an entirety of the
first magnetic heat exchange unit 113A and the second magnetic heat
exchange unit 113B, it is preferable that the first magnetic heat
exchange unit 113A and the second magnetic heat exchange unit 113B
is disposed in line.
[0079] When the electromagnet is used, a current may be applied
intermittently to embody applying or erasing the magnetic
field.
[0080] The cycle of the active magnetic refrigerator employing the
magnetic heat exchange unit 113 in accordance with the first
alternative example of the present invention will now be described
wherein the characteristic of the magnetocaloric material is
subjected to an experiment by setting an atmospheric temperature
which carries out an heat exchange with the hot heat exchanger 162,
and an atmospheric temperature which carries out an heat exchange
with the cold heat exchanger 163 are set at 26.degree. C.
respectively, considering a characteristic of the magnetocaloric
material wherein a temperature thereof rises by 3.degree. C. when
the magnetocaloric material is magnetized and drops by 3.degree. C.
when cooled by the heat transfer fluid.
[0081] The entire system except the magnet unit 140 is fixed and
the magnet unit 140 is subjected to the reciprocation motion
between the first magnetic heat exchange unit 113A and the second
magnetic heat exchange unit 113B to alternately apply and erase the
magnetic field.
[0082] A state wherein the magnet unit 140 is positioned at the
first magnetic heat exchange unit 113A is be described below.
[0083] When the magnetic field is applied to the magnetocaloric
material of the first magnetic heat exchange unit 113A, the first
solenoid valve 120a is in operation to carry out a heat exchange
wherein the first heat transfer fluid 17aa of the tube 130
(26.degree. C.) is flown to the first magnetic heat exchange unit
113A through the tube 130a with a pressure to cool the
magnetocaloric material (29.degree. C.) heated by the magnetic
field to 26.degree. C., and the first heat transfer fluid 17ab
absorbs a heat to have a temperature of 29.degree. C. A cycle is
carried out wherein the first heat transfer fluid 17ab that carried
out the heat exchange passes through the tube 131a and the tube 131
to carry out an heat exchange with an atmosphere at the hot heat
exchanger 162 and cooled to the first heat transfer fluid 17aa of
26.degree. C. (see thin solid line of FIG. 6).
[0084] The second solenoid valve 120b at the second magnetic heat
exchange unit 113B that does not have any magnetic field applied
thereto is operated to carry out an heat exchange wherein the
second heat transfer fluid 17bc (26.degree. C.) of the tube 132 is
flown to the second magnetic heat exchange unit 113B with a
pressure through the tube 132a so as to heat the heat transfer
fluid (23.degree. C.) to 26.degree. C., and the second heat
transfer fluid 17bc is cooled to 23.degree. C. After the second
heat transfer fluid 17bb of 23.degree. C. that carried out the heat
exchange passes through the tube 133a and the tube 133 to carry out
an heat exchange with an indoor at the cold heat exchanger 163, the
second heat transfer fluid 17bc of 23.degree. C. passes through the
second magnetic heat exchange unit 113B. The above-described cycle
is repeated to carry out the heat exchange (see thick solid line of
FIG. 6).
[0085] As described above, while the first solenoid valve 120a is a
valve for redirecting the first heat transfer fluid to the first
magnetic heat exchange unit 113A or the second magnetic heat
exchange unit 113B so that the first heat transfer fluid may absorb
the heat in the indoor and then emit the heat to the atmosphere,
the second solenoid valve 120bis a valve for redirecting the second
heat transfer fluid to the first magnetic heat exchange unit 113A
or the second magnetic heat exchange unit 113B that does not have
the magnetic field applied thereto so that the second heat transfer
fluid 17 may be cooled and then may absorb the hear in the indoor.
The redirecting function may be embodied by a simple program in a
digital format.
[0086] As described above, the circulation of the heat transfer
fluid is divided into the hot heat exchanger and the cold heat
exchanger for the heat exchange of two cycles, thereby simplifying
the structure of a magnetic refrigerating cycle.
[0087] In addition, in accordance with the system, since the heat
transfer fluid at the atmospheric temperature is injected to the
magnetocaloric material, the heat transfer fluid is heated and
cooled more according to a state of the material to improve an
efficiency of the heat exchanger.
[0088] Moreover, since the active magnetic refrigerator is divided
into the hot heat exchanger and the cold heat exchanger, amounts of
the first heat transfer fluid and the second heat transfer fluid
17bb are controlled to be different. Therefore, a larger amount of
the first heat transfer fluid may be flown to the hot side of the
magnetic heat exchange unit to maximize the cooling of the
magnetocaloric material.
Second Embodiment
[0089] FIGS. 14 and 15 are plan views illustrating a cycle of a
heat transfer fluid according to a position of a magnet in
accordance with an active magnetic refrigerator in accordance with
a second preferred embodiment of the present invention, FIG. 16 is
a plan view illustrating the cycle of FIGS. 14 and 15 as one, FIG.
17 is a schematic diagram illustrating a magnet rotating assembly,
and FIGS. 18 and 19 are a perspective view and a partially
magnified view of a table having a flow path.
[0090] As shown in FIGS. 14 through 19, the active magnetic
refrigerator in accordance with the preferred embodiment of the
present invention comprises a first magnetic heat exchange units
113A and 113A' and a second magnetic heat exchange units 113B and
113B' including a magnetocaloric material, a magnet 1141 attached
to the magnetic heat exchange units 113A, 113A', 113B and 113B', a
magnet rotating assembly 1140 for applying and erasing a magnetic
field by rotating the magnet 1141, a hot heat exchanger 162, a cold
heat exchanger 163, a first solenoid valve 120a and a second
solenoid valve 120b.
[0091] The heat transfer fluid is divided into a first heat
transfer fluids 17aa and 17ab circulating in the hot heat exchanger
162, and a second heat transfer fluids 17bb and 17bc circulating in
the cold heat exchanger 163 to form a cycle.
[0092] A plurality of the first magnetic heat exchange units 113A
and 113A' are disposed on a left and a right and a plurality of the
second magnetic heat exchange units 113B and 113B' are disposed at
a top and a bottom from a plan view.
[0093] The first solenoid valve 120a is a 3-port 2-way solenoid
valve for redirecting the first heat transfer fluid 17aa of the
cold side exhausted from the hot heat exchanger 162 to the first
magnetic heat exchange units 113A and 113A' through the tube 130a
or to the second magnetic heat exchange units 113B and 133B'
through the tube 130b such that the first heat transfer fluid 17ab
that has carried out a heat exchange flows into the cold heat
exchanger 163.
[0094] That is, the first solenoid valve 120a is disposed at a
junction wherein the tube 130a or the tube 130b connected to the
first magnetic heat exchange unit 113A or the second magnetic heat
exchange unit 113B is divided.
[0095] Similarly, the second solenoid valve 120b is the 3-port
2-way solenoid valve for redirecting the second heat transfer fluid
17bb of the hot side exhausted from the cold heat exchanger 163 to
the second magnetic heat exchange units 113B and 113B' through the
tube 132a or to the second magnetic heat exchange units 113B and
133B' through the tube 130b such that the first heat transfer fluid
17ab that has carried out a heat exchange flows into the cold heat
exchanger 163.
[0096] That is, the second solenoid valve 120b is disposed at a
junction wherein the tube 132a or the tube 132b connected to the
second magnetic heat exchange unit 113B' or the first magnetic heat
exchange unit 113A' is divided.
[0097] As described above, since the first heat transfer fluids
17aa and 17ab of the hot side and the second heat transfer fluids
17bb and 17bc of the cold side is dividedly circulated as two
cycles, a larger amount of the heat transfer fluid may be flown to
the hot side by controlling an amount thereof to improve a heat
exchange efficiency.
[0098] Since the magnetic heat exchange units 113A, 113A', 113B and
113B' are similar to those of the first embodiment, a detailed
description is thereby omitted.
[0099] In addition, it is preferable that the magnetic heat
exchange units 113A, 113A', 113B and 113B' are mounted on a table
1150. As shown in FIG. 18, the table 1150 comprises an upper plate
1150a having mounting parts 1153A, 1153A', 1153B and 1153B' formed
therein for mounting the magnetic heat exchange units 113A, 113A',
113B and 113B' having a predetermined distance therebetween, and a
connecting path for connecting the tubes 130a, 131a, 132a, 133a,
130b, 131b, 132b and 133b and the upper plate 1150a as well as
supporting the upper plate 1150a. The mounting parts 1153A and
1153B may be embodied by a groove or a through-hole.
[0100] Particularly, as shown in FIG. 19, a mixing of the first
heat transfer fluid and the second heat transfer fluid is prevented
at a crossing thereof by employing a bridge 1155 and a tunnel 1157
in the connecting path inside the upper plate 1150a. The bridge
1155 has a form of elevated overpass which is thicker than other
connecting path to allow a facile formation of the tunnel 1157.
[0101] Due to the bridge 1155 and the tunnel 1157, a thickness of
the upper plate 1150a is minimized.
[0102] The magnet rotating assembly 1140 for applying the magnetic
field to the first magnetic heat exchange units 113A and 113A' or
the second magnetic heat exchange units 113B and 113B' or erasing
the magnetic field therefrom by rotating the magnet 1141 may be
mounted on a through-hole 1151 punched at a center of the upper
plate 1150a.
[0103] The magnet rotating assembly 1140 rotates the magnet 1141
disposed at both sides of the first magnetic heat exchange units
113A and 113A' or the second magnetic heat exchange units 113B and
113B' to the second magnetic heat exchange units 113B and 113B' or
the first magnetic heat exchange units 113A and 113A'. That is, as
shown in FIG. 17, it is preferable that the magnet rotating
assembly 1140 comprises a plurality of yokes 1143 having the magnet
1141 disposed at both sides thereof, a rotation support 1147 for
supporting the magnet 1141, and a rotational power transfer member
for rotating the rotation support 1147.
[0104] The rotational power transfer member may be embodied by a
motor 1148, a rotating shaft 1149 for transferring a rotational
power of the motor 1148 to the rotation support 1147.
[0105] It should be understood by the skilled in the art that
various rotational power transfer members may be embodied such as
directly connecting the rotating shaft 1149 to the plurality of
yokes 1143 for a rotation or using a belt to rotate the plurality
of yokes 1143.
[0106] The cycle of the active magnetic refrigerator employing the
magnetic heat exchange units 113A, 113A', 113B and 113B' in
accordance with the second embodiment of the present invention will
now be described wherein the characteristic of the magnetocaloric
material is subjected to an experiment by setting an atmospheric
temperature which carries out an heat exchange with the hot heat
exchanger 162, and an atmospheric temperature which carries out an
heat exchange with the cold heat exchanger 163 are set at
26.degree. C. respectively, considering a characteristic of the
magnetocaloric material wherein a temperature thereof rises by
3.degree. C. when the magnetocaloric material is magnetized and
drops by 3.degree. C. when cooled by the heat transfer fluid.
[0107] The entire system except the magnet 1141 is fixed and only
the magnet 1141 is rotated by the magnet rotating assembly 1140 to
alternately apply the magnetic field to the magnetocaloric material
of the first magnetic heat exchange units 113A and 113A' or the
second magnetic heat exchange units 113B and 113B'.
[0108] As shown in FIG. 14, a state wherein the magnet 1141 is
positioned at the first magnetic heat exchange units 113A and 113A'
at the right and left thereof is be described below.
[0109] When the magnetic field is applied to the magnetocaloric
material of the first magnetic heat exchange units 113A and 113A',
the first solenoid valve 120a is in operation to carry out a heat
exchange wherein the first heat transfer fluid 17aa of 26.degree.
C. is flown to the first magnetic heat exchange units 113A and
113A' through the tube 130a with a pressure to cool the
magnetocaloric material (29.degree. C.) heated by the magnetic
field to 26.degree. C., and the first heat transfer fluid 17ab
absorbs a heat to have a temperature of 29.degree. C. A cycle is
carried out wherein the first heat transfer fluid 17ab that carried
out the heat exchange passes through the tube 131a to carry out an
heat exchange with an atmosphere at the hot heat exchanger 162 and
cooled to the first heat transfer fluid 17aa of 26.degree. C. (see
thin solid line arrow of FIGS. 14 and 15).
[0110] The second solenoid valve 120b at the second magnetic heat
exchange units 113B and 113B' that do not have any magnetic field
applied thereto is operated to carry out an heat exchange wherein
the second heat transfer fluid 17bb having the temperature of
26.degree. C. is flown to the second magnetic heat exchange units
113B and 113B' with a pressure through the tube 132a so as to heat
the heat transfer fluid having the temperature of 23.degree. C. to
26.degree. C., and the second heat transfer fluid 17bc is cooled to
23.degree. C. After the second heat transfer fluid 17bc of
23.degree. C. that carried out the heat exchange passes through the
tube 133a to carry out an heat exchange with the indoor at the cold
heat exchanger 163, the second heat transfer fluid 17bb passes
through the second magnetic heat exchange units 113B. The
above-described cycle is repeated to carry out the heat exchange
(see thick solid line arrow of FIGS. 14 and 15).
[0111] On the other hand, as shown in FIG. 15, a state wherein the
magnet 1141 is rotated to be positioned at the second magnetic heat
exchange units 113B and 113B' at the top and the bottom is
described below.
[0112] When the magnetic field is applied to the magnetocaloric
material of the second magnetic heat exchange units 113B and 113B',
the first solenoid valve 120a is in operation to carry out a heat
exchange wherein the first heat transfer fluid 17aa of 26.degree.
C. is flown to the second magnetic heat exchange units 113B and
113B' through the tube 130b with a pressure to cool the
magnetocaloric material (29.degree. C.) heated by the magnetic
field to 26.degree. C., and the first heat transfer fluid 17ab
absorbs a heat to have a temperature of 29.degree. C. A cycle is
carried out wherein the first heat transfer fluid 17ab that carried
out the heat exchange passes through the tube 131b to carry out an
heat exchange with an atmosphere at the hot heat exchanger 162 and
cooled to the first heat transfer fluid 17aa of 26.degree. C. (see
thin dotted line arrow of FIGS. 14 and 16).
[0113] The second solenoid valve 120b at the first magnetic heat
exchange units 113A and 113A' that do not have any magnetic field
applied thereto is operated to carry out an heat exchange wherein
the second heat transfer fluid 17bb having the temperature of
26.degree. C. is flown to the first magnetic heat exchange units
113A and 113A' with a pressure through the tube 132b so as to heat
the heat transfer fluid having the temperature of 23.degree. C. to
26.degree. C., and the second heat transfer fluid 17bc is cooled to
23.degree. C. After the second heat transfer fluid 17bc of
23.degree. C. that carried out the heat exchange passes through the
tube 133b to carry out an heat exchange with the indoor at the cold
heat exchanger 163, the second heat transfer fluid 17bb of
23.degree. C. passes through the first magnetic heat exchange units
113A and 113A'. the above-described cycle is repeated to carry out
the heat exchange (see thick dotted line of FIGS. 14 and 16).
[0114] As described above, while the first solenoid valve 120a is a
valve for redirecting the first heat transfer fluid to the first
magnetic heat exchange units 113A and 113A' or the second magnetic
heat exchange units 113B and 113B' so that the first heat transfer
fluid may absorb the heat in the indoor and then emit the heat to
the atmosphere, the second solenoid valve 120bis a valve for
redirecting the second heat transfer fluid to the first magnetic
heat exchange units 113A and 113A' or the second magnetic heat
exchange units 113B and 113B' that do not have the magnetic field
applied thereto so that the second heat transfer fluid may be
cooled and then may absorb the hear in the indoor. The redirecting
function may be embodied by a simple program in a digital
format.
[0115] As described above, the circulation of the heat transfer
fluid is divided into the hot heat exchanger and the cold heat
exchanger for the heat exchange of two cycles, thereby simplifying
the structure of a magnetic refrigerating cycle.
[0116] While the present invention has been particularly shown and
described with reference to the preferred embodiment thereof, it
will be understood by those skilled in the art that various changes
in form and details may be effected therein without departing from
the spirit and scope of the invention as defined by the appended
claims.
[0117] As described above, the circulation of the heat transfer
fluid is divided into the hot heat exchanger and the cold heat
exchanger for the heat exchange of two cycles, thereby simplifying
the structure of a magnetic refrigerating cycle.
[0118] Moreover, since the magnetic refrigerator is divided into
the hot heat exchanger and the cold heat exchanger, amounts of the
first heat transfer fluid and the second heat transfer fluid 17bb
are controlled to be different. Therefore, a larger amount of the
first heat transfer fluid may be flown to the hot side of the
magnetic heat exchange unit to maximize the cooling of the
magnetocaloric material.
[0119] In addition, the adiabatic state wherein the magnetocaloric
material piece is not exposed may be achieved to improve the heat
exchange efficiency.
[0120] Moreover, the hot heat exchange circulating member and the
cold heat exchange circulating member embodies the close cycle
similar to the closed circuit. Therefore, since the atmospheric
pressure does not act on the heat transfer fluid directly, almost
no resistance is applied to the pump, thereby reducing the time
required for the heat exchange and improving the heat efficiency.
This allows a use of a single pump since the pressure adjustment
range is increased according to a size and the heat efficiency of
the magnetic heat exchange unit.
[0121] In addition, each of the hot side and the cold side has
dedicated ports (two in the upper portion, two in the lower
portion), the hot and cold heat transfer fluids are not mixed
resulting in the high heat exchange efficiency.
[0122] The magnetic heat exchange unit is constructed to comprise
the case and the plurality of magnetocaloric material pieces
disposed in the case to form the gap so that the heat transfer
fluid may be flown through the gap, thereby improving the heat
exchange efficiency through a uniform contact between the plurality
of magnetocaloric material pieces and the heat transfer fluid and
eliminating a need for the mesh for the smooth flow of the heat
transfer fluid.
[0123] Moreover, the magnetocaloric material piece is embodied to
have the shape of the plate or the rod, the magnetocaloric material
piece is not easily lost.
[0124] In addition, since the magnet unit comprises the yoke and
the reciprocation transfer member, the magnetic field may be
applied or erased with the magnetic heat exchange unit being fixed,
and the yoke concentrates the magnetic field of the permanent
magnet toward the direction of the magnetic heat exchange unit to
apply the high intensity magnetic field to the magnetic heat
exchange unit
[0125] Moreover, the heat exchange efficiency is improved by
increasing the contact area with the heat transfer fluid when the
groove is formed on the plurality of magnetocaloric material pieces
having the shape of the rod in the lengthwise direction.
[0126] In addition, the active magnetic refrigerator comprises the
table which includes a plurality of mounting parts for mounting the
first magnetic heat exchange unit and the second magnetic heat
exchange unit disposed on the rotational plane of the magnet, a
through-hole having the magnet rotating assembly mounted at the
center thereof, and a table for constituting a connecting path for
connecting the heat exchangers and the magnetic heat exchange units
such that an installation of the magnetic heat exchange unit is
simplified, the formation of the connecting path for connecting the
heat exchanges is possible, and a layout of the tube is
superior.
[0127] Moreover, since the connecting path at a crossing of the
first heat transfer fluid and the second heat transfer fluid has
the form of the tunnel and the bridge, the mixing of the fluids is
prevented while maintaining the superior layout of the tube.
[0128] In addition, since the magnet rotating assembly comprises
the yoke and the rotational power transfer member, the magnetic
field may be applied or erased while the magnetic heat exchange
unit being fixed, and the yoke concentrates the magnetic field of
the magnet toward the direction of the magnetic heat exchange unit
to apply the high intensity magnetic field to the magnetic heat
exchange unit.
LIST OF REFERENCE SIGNS
[0129] 160, 161: pump [0130] 162: hot heat exchanger [0131] 163:
cold heat exchanger [0132] 17aa, 17ab: first heat transfer fluids
[0133] 17bb, 17bc: second heat transfer fluids [0134] 112, 212,
312, 412a, 412b: magnetocaloric material pieces (Gd) [0135] 113,
213, 313, 413: magnetic heat exchange units [0136] 114, 214, 314,
414: gaps [0137] 115: case [0138] 115a, 115b': outlet ports [0139]
115a', 115b: inlet ports [0140] 130, 131, 132, 133: tube [0141]
140: magnet unit [0142] 141: permanent magnet [0143] 143: yoke
[0144] 145: rack [0145] 147: pinion [0146] 149: motor shaft [0147]
1140: magnet rotating assembly [0148] 1141: magnet [0149] 1143:
yoke [0150] 1147: rotation support. [0151] 1148: motor [0152] 1149:
motor shaft [0153] 1150: table [0154] 1150a: upper plate [0155]
1150b: leg [0156] 1153A, 1153B: mounting part [0157] 1155: bridge
[0158] 1157: tunnel
* * * * *