U.S. patent application number 13/187049 was filed with the patent office on 2012-01-26 for control valve for variable displacement compressor.
This patent application is currently assigned to Fujikoki Corporation. Invention is credited to Yoshiyuki Kume, Shintaro Tano.
Application Number | 20120020814 13/187049 |
Document ID | / |
Family ID | 44645428 |
Filed Date | 2012-01-26 |
United States Patent
Application |
20120020814 |
Kind Code |
A1 |
Tano; Shintaro ; et
al. |
January 26, 2012 |
CONTROL VALVE FOR VARIABLE DISPLACEMENT COMPRESSOR
Abstract
There is provided a control valve for a variable displacement
compressor capable of directly connecting a plunger to a valve rod
in a relatively easy way, and realizing an improvement in
assemblability, reduction in costs, and the like. A connecting
cylinder for directly connecting the plunger to the valve rod is
provided. The valve rod is provided with a mushroom-like or
flange-like part. The connecting cylinder is provided with an
elastic locking piece which, by pushing the mushroom-like or
flange-like part into the elastic locking piece, is pushed and
opened outward in a radial direction so as for the mushroom-like or
flange-like part to pass through the elastic locking piece, and
which, after the passing of the mushroom-like or flange-like part,
is restored to an original shape due to elasticity which the
elastic locking piece has, and locks the mushroom-like or
flange-like part.
Inventors: |
Tano; Shintaro; (Tokyo,
JP) ; Kume; Yoshiyuki; (Tokyo, JP) |
Assignee: |
Fujikoki Corporation
Tokyo
JP
|
Family ID: |
44645428 |
Appl. No.: |
13/187049 |
Filed: |
July 20, 2011 |
Current U.S.
Class: |
417/289 |
Current CPC
Class: |
F16K 31/06 20130101 |
Class at
Publication: |
417/289 |
International
Class: |
F04B 49/00 20060101
F04B049/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 21, 2010 |
JP |
2010-163642 |
Claims
1. A control valve for a variable displacement compressor
comprising: a valve rod having a valve body part; a valve body
having a guide hole, in which the valve rod is slidably fitted, and
having a valve chamber provided with a valve port, at which the
valve body part contacts/leaves, wherein a discharge-pressure
refrigerant inlet for guiding therein refrigerants of discharge
pressure from a compressor is provided upstream of the valve port,
and a refrigerant outlet communicated with a crank chamber of the
compressor is provided downstream of the valve port; an
electromagnetic actuator including a plunger for moving the valve
rod in a valve-closing direction; a pressure sensing chamber into
which intake pressure is guided from the compressor; and a
pressure-sensitive responding member which presses the valve rod in
a valve-opening direction in response to the pressure of the
pressure sensing chamber, wherein a connecting member for
connecting the plunger to the valve rod is provided, the connecting
member being configured such that the valve rod is inserted into
the guide hole of the valve body, thereby engaging with one end of
the valve rod to lock the one end.
2. The control valve for a variable displacement compressor of
claim 1, wherein the valve rod is provided with a mushroom-like or
flange-like part; wherein the connecting member has a cylindrical
shape, and is fabricated from an elastic plate material; and
wherein the connecting member is provided with an elastic locking
piece which, by pushing the mushroom-like or flange-like part into
the elastic locking piece, is pushed and opened outward in a radial
direction so as for the mushroom-like or flange-like part to pass
through the elastic locking piece, and which, after the passing of
the mushroom-like or flange-like part, is restored to an original
shape due to elasticity which the elastic locking piece has, and
locks the mushroom-like or flange-like part.
3. The control valve for a variable displacement compressor of
claim 2, wherein a bottom part of the cylindrical connecting member
is provided with the elastic locking piece having a truncated cone
shape split into a plurality of parts, and the elastic locking
piece bends inward from the bottom part.
4. The control valve for a variable displacement compressor of
claim 1, wherein there is provided, in the connecting member, a
bellows device and the pressure sensing chamber both serving as the
pressure-sensitive responding member.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Japanese Patent
Application No. 2010-163642, filed Jul. 21, 2010, all of which is
herein incorporated by reference in its entirety.
BACKGROUND
[0002] 1. Technical Field
[0003] The present disclosure relates to a control valve for a
variable displacement compressor that is used in a car
air-conditioner or the like, and in particular, to a control valve
for a variable displacement compressor wherein the control valve
substantially prevents a valve rod from causing defective
operation, and which is easily assembled.
[0004] 2. Background Art
[0005] In general, in order to adjust pressure Pc in a crank
chamber of a compressor, a control valve for a variable
displacement compressor used in a car air-conditioner or the like
is typically configured to guide in refrigerants of discharge
pressure Pd from the compressor (e.g., a discharge chamber of the
compressor) and narrow down the refrigerants of the discharge
pressure Pd to guide out such refrigerants into the crank chamber.
In addition, the control valve for a variable displacement
compressor is typically configured to control a guide-out amount
(narrowing-down amount) into the crank chamber in response to
intake pressure Ps of the compressor. As a basic configuration and
as disclosed in Patent Document 1 (JP Patent Publication (Kokai)
No. 2003-172256 A, the entire contents of which is herein
incorporated by reference in its entirety), the aforesaid control
valve typically includes: a valve rod having a valve body part, a
valve body having a guide hole, in which the valve rod is slidably
fitted, and having a valve chamber provided with a valve port, at
which the valve body part contacts/leaves, wherein a
discharge-pressure refrigerant inlet (Pd port) for guiding therein
the refrigerants of the discharge pressure from the compressor is
provided upstream of the valve port, and a refrigerant outlet (Pc
port) communicated with the crank chamber of the compressor is
provided downstream of the aforesaid valve port; a coil; a
cylindrical stator arranged on the inner peripheral side of the
coil; an attractor fixed to the stator; a plunger slidably arranged
in an up-and-down direction below the attractor; a plunger spring
arranged between the attractor and the plunger; an electromagnetic
actuator having a guide pipe in which the plunger is slidably
fitted; a pressure sensing chamber which is formed above the
attractor and in which intake pressure is guided from the
compressor via an intake pressure guiding-in port (Ps port); a
pressure-sensitive responding member which biases the valve rod in
a valve-opening direction in response to the pressure of the
pressure sensing chamber; and a valve-closing spring which biases
the valve rod in a valve-closing direction.
[0006] In the control valve configured as such, when the coil of
the electromagnetic actuator is energized, the plunger is attracted
to the attractor. With this, a biasing force of the valve-closing
spring makes the valve rod move in the valve-closing direction so
as to follow the plunger. Meanwhile, the refrigerants of the intake
pressure Ps, which has been guided in from the compressor via the
Ps port, are guided into the pressure sensing chamber from a
guide-in chamber via a clearance or the like formed between the
plunger and the guide pipe arranged on an outer periphery of the
plunger. The pressure-sensitive responding member (e.g., a bellows
device) is elastically displaced in response to the pressure of the
pressure sensing chamber (intake pressure Ps) (e.g., when the
intake pressure Ps is high, the pressure-sensitive responding
member contracts; whereas when the intake pressure Ps is low, the
pressure-sensitive responding member extends). Such displacement
(e.g., biasing force) is transmitted to the valve rod, thereby
adjusting the valve opening.
[0007] That is, the valve opening is typically determined based on
an attractive force with which the attractor attracts the plunger,
the biasing force of the pressure-sensitive responding member, and
the biasing forces of the plunger spring (valve-opening spring) and
of the valve-closing spring. In response to such valve opening, the
guide-out amount (narrowing-down amount) toward the outlet side of
the refrigerants of the discharge pressure Pd guided into the valve
chamber from the Pd port, namely, into the crank chamber. This
makes the pressure Pc in the crank chamber controlled.
[0008] However, in the control valve, the valve rod is typically
configured to be moved in the valve-closing direction only by the
biasing force of the valve-closing spring. If a foreign material
becomes stuck between sliding contact surfaces of the valve rod and
the guide hole, or the sliding resistance of the valve rod
increases due to the seizure of oil or the like, there may occur
malfunctioning such as the locking of the valve rod; for example, a
problem that even if the plunger is attracted to the attractor, the
valve rod is not moved in the valve-closing direction, and is left
behind. In this case, the valve opening cannot be adequately
adjusted. In order to solve such malfunctioning, it is typically
only necessary to increase the biasing force of the valve-closing
spring. However, this makes it necessary also to increase the
biasing force of the plunger spring (e.g., valve-opening spring),
resulting in the enlargement of the spring and a product, an
increase in costs, and the like.
[0009] In order to solve the aforementioned problem, Patent
Document 2 (JP Patent Publication (Kokai) No. 2004-100473 A, the
entire contents of which is herein incorporated by reference in its
entirety) proposes a technique in which the plunger is directly
connected to (integrated with) the valve rod, and when the plunger
is attracted to the attractor, together with this, the valve rod is
forcibly moved in the valve-closing direction.
[0010] However, also in the control valve in which the plunger is
directly connected to the valve rod as proposed above, the
following problems could occur.
[0011] That is, at the time of energization, the plunger may be
deviated laterally or may be drawn on one side (e.g., in terms of
the relationship of the coaxiality or the like of the attractor and
the plunger) on a magnetic circuit, or may move in the up-and-down
direction (in the valve-opening/closing direction) while being
inclined. Thus, if the plunger is directly connected to the valve
rod without any looseness, the valve rod is pressed against the
guide hole with the rise of the lateral deviation or the
inclination of the plunger, and the sliding resistance increases,
resulting in being incapable of smoothly moving. This may cause the
malfunctioning, such as the locking, in the same manner as
mentioned above, in extreme cases.
[0012] In addition, when the plunger is directly connected to the
valve rod, due to the above-mentioned problem, there is a tendency
that the dimensional control or the assembling accuracy of parts,
etc., is strictly required, resulting in an increase in costs.
[0013] In order to solve the above-mentioned problems, as described
in Patent Document 3 (JP Patent Publication (Kokai) No. 2007-285159
A, the entire contents of which is herein incorporated by reference
in its entirety) the assignee of the present application has
proposed (e.g., in FIGS. 3 to 5 thereof), the control valve for a
variable displacement compressor in which, when the plunger is
attracted to the attractor, the valve rod is forcibly pulled in the
valve-closing direction by the plunger; however, the valve rod is
fitted with a predetermined clearance in a radial direction with
respect to the plunger so as not to be affected by the lateral
deviation and the inclination of the plunger. More specifically, as
shown in FIGS. 3 to 5 of the aforesaid Patent Document 3, this
control valve is configured such that, for example, the valve rod
is provided with a small diameter part; above the small diameter
part, a large diameter part, which will be a locking part for
forcible movement, is provided; at the center of the plunger, a
central hole, in which the aforesaid small diameter part is fitted;
in order to improve the convenience at the time of assembly, an
eccentric hole, into which the aforesaid large diameter part is
insertable while the eccentric hole is made eccentric by a
predetermined distance in the radial direction so as to be
partially overlapped with the aforesaid central hole; and the
clearance, which is formed between the aforesaid small diameter
part and the aforesaid central hole, is larger than the clearance,
which is formed between the plunger and the guide pipe arranged on
the outer periphery of the plunger.
SUMMARY
[0014] However, the control valve for a variable displacement
compressor described in Patent Document 3 is configured such that,
when assembling the valve, the valve rod is inserted into the valve
body from underneath, and the plunger is passed through the valve
rod; and thereafter, the plunger is laterally deviated to be fitted
to the valve rod or caulked thereto, thereby directly connecting
the plunger to the valve rod; and thus, there is a tendency that
the assembling of the valve may require great care, resulting in
high manufacturing costs.
[0015] The present disclosure has been made in view of the
above-mentioned circumstances. It is an object of the present
disclosure to provide a control valve for a variable displacement
compressor capable of directly connecting a plunger to a valve rod
in a relatively easy way, and realizing an improvement in
assemblability (e.g., easily assembled), reduction in costs, and
the like.
[0016] In order to achieve the above-mentioned object, a control
valve for a variable displacement compressor according to the
present disclosure typically includes: a valve rod having a valve
body part and a valve body having a guide hole, in which the valve
rod is slidably fitted, and having a valve chamber provided with a
valve port, at which the valve body part contacts/leaves, wherein a
discharge-pressure refrigerant inlet for guiding therein
refrigerants of discharge pressure from a compressor is provided
upstream of the valve port, and a refrigerant outlet communicated
with a crank chamber of the compressor is provided downstream of
the aforesaid valve port; an electromagnetic actuator having a
plunger for moving the valve rod in a valve-closing direction; a
pressure sensing chamber into which intake pressure is guided from
the compressor; and a pressure-sensitive responding member which
presses the valve rod in a valve-opening direction in response to
the pressure of the pressure sensing chamber, wherein a connecting
member for connecting the plunger to the valve rod is provided, the
connecting member being configured such that the valve rod is
inserted into the guide hole of the valve body, thereby engaging
with one end of the valve rod to lock the one end.
[0017] In a more specific and preferred aspect, the valve rod is
provided with a mushroom-like or flange-like part, and the
connecting member has a cylindrical shape, and is made of an
elastic plate material. In addition, the connecting member is
provided with an elastic locking piece which, by pushing the
mushroom-like or flange-like part into the elastic locking piece,
is pushed and opened outward in a radial direction so as for the
mushroom-like or flange-like part to pass through the elastic
locking piece, and which, after the passing of the mushroom-like or
flange-like part, is restored to an original shape due to
elasticity which the elastic locking piece has, and locks the
mushroom-like or flange-like part.
[0018] In this case, in a more specific and preferred aspect, a
bottom part of the cylindrical connecting member is provided with
the elastic locking piece having a truncated cone shape split into
a plurality of parts, and the elastic locking piece bends inward
from the bottom part.
[0019] In another preferred aspect, in the connecting member, there
is provided a bellows device and the pressure sensing chamber both
serving as the pressure-sensitive responding member.
[0020] In a control valve for a variable displacement compressor
according to the present disclosure, it is possible to very easily
connect a plunger to a valve rod only by inserting a valve rod into
a guide hole of the valve body, and is possible to realize an
improvement in assemblability, reduction in costs, and the
like.
[0021] In addition, a connecting member is configured to have a
cylindrical shape and be made of an elastic plate material, whereby
it is possible to keep manufacturing costs down, and realize weight
saving and the like.
[0022] Moreover, since a bellows device can be arranged in the
connecting member that is located underneath a coil, a coil
diameter can be made small, compared with a case where the bellows
device is arranged at the inner peripheral part of the coil. This
also makes it possible to realize downsizing, reduction in costs,
and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is a longitudinal sectional view showing one
embodiment of a control valve for a variable displacement
compressor according to the present disclosure.
[0024] FIG. 2 is a sectional view taken along and as viewed in a
direction of arrows X-X of FIG. 3A.
[0025] FIGS. 3A to 3C are views provided for the explanation of
valve assembling of the embodiment shown in FIG. 1.
DETAILED DESCRIPTION
[0026] Hereinafter, an explanation will be made as to embodiments
of a control valve for a variable displacement compressor of the
present disclosure with reference to the drawings.
[0027] FIG. 1 is a longitudinal sectional view showing one
embodiment of the control valve for a variable displacement
compressor according to the present disclosure.
[0028] An illustrated control valve 1 includes an electromagnetic
actuator 30, a valve body 20, a valve rod 15 that is slidably
fitted in the valve body 20, and a bellows device 40 serving as a
pressure-sensitive responding member.
[0029] The electromagnetic actuator 30 includes a coil 32 for
energized excitation, a connector head 31 having a power-supply
connector part 31A attached on the upper side of the coil 32, a
cylindrical attractor 34 (stator) arranged on the inner peripheral
side of the coil 32, a stair-like stepped guide pipe 35 whose upper
end is joined to an outer periphery of a lower end (stepped part)
of the attractor 34 using TIG welding or the like, a plunger 37
slidably arranged in an up-and-down direction on the inner
peripheral side of the guide pipe 35 under the attractor 34, a
stepped cylindrical housing 60 externally inserted around the coil
32 and the connector head 31, and a holder 50 that is arranged
between a lower end of the housing 60 and the stepped guide pipe 35
and fixes such lower end and such guide pipe to the upper part of
the valve body 20.
[0030] A hexagon socket head adjusting screw 65 is screwed into the
upper part of the attractor 34. With a lower end surface of this
adjusting screw 65, an upper end surface of a tension rod 33, which
is slidably fitted in the attractor 34 and the plunger 37, is
brought into contact.
[0031] The valve body 20 includes a valve chamber 21 provided with
a valve seat (valve port) 22 at which a valve body part 15a of the
valve rod 15 contacts/leaves. At the outer peripheral part of this
valve chamber 21 (on the lower side of the valve seat 22), there
are provided a plurality of discharge pressure refrigerant
guiding-in ports 25 for guiding therein refrigerants of discharge
pressure Pd from a compressor. On the upper side of the valve seat
22, a convex stopper part 28 for restricting the most lowered
position of the plunger 37 is fixed by means of press-fitting or
the like. Between this convex stopper part 28 and the valve seat
22, there is provided a guide-out chamber 24 for guiding the
refrigerant (pressure Pc of the refrigerant), which flows via the
valve seat (valve port) 22 from the valve chamber 21 while being
narrowed down, into a crank chamber. At the lower part of the valve
body 20, there are provided a plurality of (e.g., four) guide-out
holes 26 that are opened to the guide-out chamber 24 and a lower
end surface of the valve body 20. In addition, at the center of a
lower end of the valve body 20, an insertion hole 13, into which
the valve rod 15 is inserted at the time of assembly, is provided.
In the insertion hole 13, by means of press-fitting or the like,
there is fixed a cylindrical plug-like guide member 12 having a
bottom and a step in which a lower end 15b (lower fitting-in part)
of the valve rod 15, which will be described later, is slidably
fitted. Moreover, on the upper side of the convex stopper part 28
in the valve body 20, an intake pressure guiding-in port (Ps port)
27 and an intake pressure guiding-in chamber 23 are provided.
[0032] The valve rod 15 includes a lower rod-like member 15A which
is slidably fitted in a guide hole 19 formed in the convex stopper
part 28 and an upper convex member 15B arranged on the upper side
of the lower rod-like member 15A. The lower rod-like member 15A
includes the lower fitting-in part 15b, the valve body part 15a
having a diameter larger than a diameter of the lower fitting-in
part 15b, a small diameter part 15c, an upper fitting-in part 15d,
and a mushroom-like head part 15e in sequence from the bottom. In
addition, the upper convex member 15B includes a small diameter
rod-like part 15f, a large diameter part 15g, and a flange-like
spring receiving part 15h in sequence from the top. Moreover,
inside of the valve rod 15 including the lower rod-like member 15A
and the upper convex member 15B, a pressure equalizing hole 18
having a T-shaped cross section is formed.
[0033] Meanwhile, in the present embodiment, in order to directly
connect the plunger 37 to the valve rod 15 (the lower rod-like
member 15A of the valve rod 15), there is provided a bottomed
cylindrical connecting cylinder (connecting member) 52 made of a
thin plate material having elasticity, and in this connecting
cylinder 52, the bellows device 40 and the upper convex member 15B
of the valve rod 15 are accommodated.
[0034] In detail, the upper part of the connecting cylinder 52 is
caulked and fixed (e.g., a caulked part 52a) to a circular groove
37a formed around the outer periphery at the lower part of the
plunger 37. In addition, as is understood with reference to FIGS. 2
and 3, at the center of a bottom part 52b of the connecting
cylinder 52, there is provided an elastic locking piece 53 having a
truncated cone shape split into four parts, which bends inward
(toward the upper side) from the bottom part 52b. As shown in the
order from FIGS. 3A through 3C, this elastic locking piece 53 is
configured such that, by pushing up the elastic locking piece 53
from underneath by means of the mushroom-like head part 15e of the
lower rod-like member 15A in the valve rod 15, the elastic locking
piece 53 is pushed and opened outward in a radial direction so as
for the mushroom-like head part 15e to pass through the elastic
locking piece 53, and after the passing of the mushroom-like head
part 15e, the elastic locking piece 53 is restored to the original
truncated cone shape split into four parts due to the elasticity
which the elastic locking piece 53 has, and locks the mushroom-like
head part 15e. The elastic locking piece 53 locks the mushroom-like
head part 15e, whereby the plunger 37 is directly connected to the
valve rod 15 via the connecting cylinder 52, and the plunger 37 and
the valve rod 15 are integrally moved up and down.
[0035] In addition, with an upper surface of the bottom part 52b of
the connecting cylinder 52 and that of the mushroom-like head part
15e, the flange-like spring receiving part 15h and the large
diameter part 15g of the upper convex member 15B are brought into
contact.
[0036] The bellows device 40 arranged in the connecting cylinder 52
includes a bellows 41 serving as the pressure-sensitive responding
member, an upper stopper 42 having a reverse convex shape, a lower
stopper 43 having a reverse concave shape, compression coil springs
44, a cylindrical spring receiver 48, and the like. The space
formed between the connecting cylinder 52 and the bellows 41 is a
pressure sensing chamber 45. An upper end surface (the upper
stopper 42) of the bellows device 40 is brought into contact with
the tension rod 33. The small diameter rod-like part 15f of the
upper convex member 15B is inserted into and brought into contact
with the lower stopper 43.
[0037] In addition, between the lower stopper 43 and the
flange-like spring receiving part 15h of the upper convex member
15B, compression coil springs 46, which support the bellows 41 and
bias the valve rod 15 in a valve-opening direction (downward), are
mounted in a compressed manner.
[0038] In the control valve 1 configured as such, when the plunger
37 is attracted to the attractor 34 (at the time of energization),
the valve rod 15 is forcibly pulled in a valve-closing direction
via the connecting cylinder 52 by means of the plunger 37.
Meanwhile, intake pressure Ps guided from the compressor into the
intake pressure guiding-in port 27 is guided into the pressure
sensing chamber 45 via a clearance of the respective members. The
bellows device 40 (the inside thereof is in a vacuum state) is
elastically displaced in response to the pressure (the intake
pressure Ps) of the pressure sensing chamber 45 (when the intake
pressure Ps is high, the bellows device 40 contracts, whereas when
the intake pressure Ps is low, the bellows device 40 extends). Such
displacement is transmitted to the valve rod 15, thereby adjusting
the valve opening.
[0039] That is, the valve opening is determined based on an
attractive force with which the attractor 34 attracts the plunger
37, a biasing force of the bellows device 40, and the biasing
forces of the compression coil springs 46. In response to the
aforementioned valve opening, a guide-out amount (narrowing-down
amount) toward an outlet 26 side of the refrigerants of the
discharge pressure Pd guided from the discharge pressure
refrigerant guiding-in port 25 into the valve chamber 21, namely,
into the crank chamber. This makes the pressure Pc in the crank
chamber controlled.
[0040] When assembling the control valve 1 of the present
embodiment, the parts configured of the plunger 37, the connecting
cylinder 52, the bellows device 40, and the upper convex member 15B
are first assembled, and this assembly is assembled to the
electromagnetic actuator 30 and the valve body 20 as shown in FIG.
1. Thereafter, the lower rod-like member 15A of the valve rod 15 is
inserted from the underside of the valve body 20 into the insertion
hole 13. As shown in the order from FIGS. 3A through 3C, the
elastic locking piece 53 having the truncated cone shape split into
four parts is pushed up from underneath by the mushroom-like head
part 15e of the lower rod-like member 15A in the valve rod 15. This
makes the elastic locking piece 53 pushed and opened outward in a
radial direction, and makes the mushroom-like head part 15e
penetrate above the elastic locking piece 53. At the same time, the
elastic locking piece 53 is restored to the original truncated cone
shape split into four parts due to the elasticity which the elastic
locking piece 53 has, and locks the mushroom-like head part 15e.
The elastic locking piece 53 locks the mushroom-like head part 15e,
whereby the plunger 37 is directly connected to the valve rod 15
via the connecting cylinder 52, and the plunger 37 and the valve
rod 15 are integrally moved up and down. Subsequently, the
plug-like guide member 12 is fixed to the insertion hole 13 by
means of press-fitting or the like, thereby assembling the control
valve 1.
[0041] As described above, in the control valve 1 of the present
embodiment, it is possible to directly connect the plunger 37 to
the valve rod 15 extremely easily only by pushing the mushroom-like
head part 15e of the valve rod 15 into the elastic locking piece 53
provided at the connecting cylinder 52, and is possible to realize
an improvement in assemblability, reduction in costs, and the
like.
[0042] In addition, since the connecting cylinder 52 can be
manufactured by, for example, performing a drawing press to a thin
metal plate, it is possible to keep manufacturing costs down, and
realize weight saving and the like.
[0043] Moreover, the bellows device 40 can be arranged in the
connecting cylinder 52 that is located underneath the coil 32, in
other words, the connecting cylinder 52 doubles as a bellows
accommodating chamber. Thus, a coil diameter can be reduced,
compared with a case where the bellows device is conventionally
arranged at the inner peripheral part of the coil 32. The reduction
in the diameter of the coil 32 also makes it possible to realize
downsizing, reduction in costs, and the like.
[0044] Although the systems and methods of the present disclosure
have been described with reference to an exemplary embodiment
thereof, the present disclosure is not limited to such exemplary
embodiment and/or implementations. Rather, the systems and methods
of the present disclosure are susceptible to many implementations
and applications, as will be readily apparent to persons skilled in
the art from the disclosure hereof. The present disclosure
expressly encompasses such modifications, enhancements and/or
variations of the disclosed embodiment. Since many changes could be
made in the above construction and many widely different
embodiments of this disclosure could be made without departing from
the scope thereof, it is intended that all matters contained in the
drawings and specification shall be interpreted as illustrative and
not in a limiting sense. Additional modifications, changes, and
substitutions are intended in the foregoing disclosure.
Accordingly, it is appropriate that the appended claims be
construed broadly and in a manner consistent with the scope of the
disclosure.
DESCRIPTION OF SYMBOLS
[0045] 1 Control valve for a variable displacement compressor
[0046] 15 Valve rod [0047] 15A Lower rod-like member [0048] 15B
Upper convex member [0049] 15e Mushroom-like head part [0050] 19
Guide hole [0051] 20 Valve body [0052] 21 Valve chamber [0053] 22
Valve seat (valve port) [0054] 30 Electromagnetic actuator [0055]
40 Bellows device [0056] 52 Connecting cylinder (connecting member)
[0057] 53 Elastic locking piece
* * * * *