U.S. patent application number 10/367867 was filed with the patent office on 2003-08-28 for bistable electromagnetic valve.
Invention is credited to Grau, Thomas, Ott, Hubert.
Application Number | 20030159454 10/367867 |
Document ID | / |
Family ID | 27618758 |
Filed Date | 2003-08-28 |
United States Patent
Application |
20030159454 |
Kind Code |
A1 |
Ott, Hubert ; et
al. |
August 28, 2003 |
Bistable electromagnetic valve
Abstract
Proposed herein is a bistable electromagnetic valve (1) with a
valve chamber (15) arranged between two pole pieces (5, 6) and a
valve body (12) displaceable therein between two end positions,
which is designed as a magnet armature for at least one permanent
magnet (9, 10) and for at least one control coil (3), which is
distinguished by a particularly compact design and low production
expense. This is achieved according to the invention by arranging
at least one permanent magnet (9, 10) inside the valve housing
(2).
Inventors: |
Ott, Hubert; (Ravensburg,
DE) ; Grau, Thomas; (Argenbuehl, DE) |
Correspondence
Address: |
William D. Breneman, Esq.
BRENEMAN & GEORGES
3150 Commonwealth Avenue
Alexandria
VA
22305
US
|
Family ID: |
27618758 |
Appl. No.: |
10/367867 |
Filed: |
February 19, 2003 |
Current U.S.
Class: |
62/222 ;
62/474 |
Current CPC
Class: |
F16K 31/0606 20130101;
F25B 43/003 20130101; F16K 31/0651 20130101; F16K 31/0662 20130101;
F16K 31/082 20130101; F16K 31/0631 20130101; F25B 2600/2511
20130101; Y10T 137/86622 20150401; F25B 2500/12 20130101 |
Class at
Publication: |
62/222 ;
62/474 |
International
Class: |
F25B 041/04; F25B
043/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 19, 2002 |
DE |
102 06 778.3 |
Claims
1. Bistable, electromagnetic valve with a valve chamber arranged
between two pole pieces and a valve body displaceable therein
between two end positions, which is designed as a magnet armature
for at least one permanent magnet and for at least one control
coil, characterized in that the permanent magnet (9, 10) is
arranged inside the valve housing (2).
2. Valve according to claim 1, characterized in that the valve
chamber (15) is arranged inside the control coil (2).
3. Valve according to one of the preceding claims, characterized in
that at least two permanent magnets (9, 10) are provided.
4. Valve according to one of the preceding claims, characterized in
that the permanent magnet(s) (9, 10) is/are arranged next to a
valve seat (17, 27).
5. Valve according to one of the preceding claims, characterized in
that the polarization direction of the permanent magnets (9, 10)
runs in an axial direction.
6. Valve according to one of the preceding claims, characterized in
that the permanent magnet or the permanent magnets (9, 10) is/are
designed as an annular magnet.
7. Valve according to one of the preceding claims, characterized in
that a spacer ring (11) is provided between two annular magnets (9,
10).
8. Valve according to one of the preceding claims, characterized in
that the valve body (12) designed as a magnet armature is
spherical.
9. Valve according to one of the preceding claims, characterized in
that a guide ring (11) is provided for the valve body (12).
10. Valve according to one of the preceding claims, characterized
in that the guide ring for the valve body (12) is provided as a
spacer ring (11) between the annular magnets (9, 10).
11. Valve according to one of the preceding claims, characterized
in that a filter element (11) is provided.
12. Valve according to one of the preceding claims, characterized
in that the filter element (11) is designed as a guide ring for the
valve body.
13. Valve according to one of the preceding claims, characterized
in that the filter element (11) is designed as a spacer ring
between the annular magnets (9, 10).
14. Valve according to one of the preceding claims, characterized
in that the valve housing (2) is comprised of a circular tube.
15. Valve according to one of the preceding claims, characterized
in that the housing (2) is designed as a single piece.
16. Valve according to one of the preceding claims, characterized
in that one or more fluid channels (19) are attached to a pole
piece (6) outside the valve axis.
17. Valve according to one of the preceding claims, characterized
in that several peripherally distributed fluid channels (19) are
attached to a pole piece (6) outside the valve axis.
18. Valve according to one of the preceding claims, characterized
in that a pole piece (6) exhibits a noncircular outside
cross-section.
19. Valve according to one of the preceding claims, characterized
in that the fluid channels (19) situated outside the valve axis are
routed past at least one permanent magnet (9, 10).
20. Valve according to one of the preceding claims, characterized
in that at least one pole piece (5, 6) is press molded or soldered
with the housing.
21. Valve according to one of the preceding claims, characterized
in that at least one sealing element (32) is provided between a
pole piece (5) and the valve housing (23).
22. Valve according to one of the preceding claims, characterized
in that a bead (20, 21) is provided inside the valve housing (2) to
fix the internal structural elements in place.
23. Valve according to one of the preceding claims, characterized
in that the guide and/or filter and/or spacer ring (11) is designed
to allow fluid through in an axial and radial direction.
24. Valve according to one of the preceding claims, characterized
in that an external coarse filter is provided.
25. Valve according to one of the preceding claims, characterized
in that it is designed as a 2/2-way valve.
26. Valve according to one of the preceding claims, characterized
in that it is designed as a 3/2-way valve.
27. Valve according to one of the preceding claims, characterized
in that a central tube is connected fluid-tight with a pole piece
(6) inside the valve housing (2).
28. Valve according to one of the preceding claims, characterized
in that a sealing element is provided between the central tube (24)
and the accompanying pole piece (6).
29. Valve according to one of the preceding claims, characterized
in that the tubular valve housing is designed as a T-piece or
Y-piece.
30. Refrigerating circuit for a refrigeration system, in particular
with several refrigerating compartments, with a compressor, a
condenser, several evaporators, which each are allocated to one of
the refrigerating compartments, as well as at least one electric
control valve for connecting the condenser with one or more of the
evaporators based on predetermined operating modes, characterized
in that the control valve (1) is designed according to one of the
preceding claims.
31. Household appliance with a refrigerating circuit, in particular
a refrigerator or freezer chest, characterized in that the
refrigerating circuit is designed according to claim 30.
Description
[0001] The invention relates to a bistable electromagnetic valve
according to the preamble to claim 1.
[0002] Values of this type are used, for example, in refrigerant
circuits of the kind described in publications DE 37 18 490 or EP
10 54 200.
[0003] In such valves, a bistable situation is achieved by
arranging permanent magnets outside the valve housing, next to the
valve chamber or next to the pole pieces, so that the valve body
has two end positions at the pole pieces, in which it is held by
these permanent magnets.
[0004] In one design, known valves have a control coil arranged in
the axial extension of a pole, thereby resulting in different
forces of attraction for the two end positions of the valve body
upon activation of the control coil. Another known layout of the
control coil is laterally situated next to the valve chamber, which
yields a uniform distribution of forces of attraction for the
control coil on the valve body in both end positions, but the
dimensions of the permanent magnets must be comparatively large due
to a lacking, or at least not closed, magnetic return sheet, which
results in a corresponding manufacturing expense.
[0005] The object of the invention relative to the described prior
art is to propose a valve with a compact design that is inexpensive
to manufacture.
[0006] This object is achieved in a valve according to the preamble
to claim 1 with the characterizing features.
[0007] The measures specified in the subclaims enable advantageous
embodiments and further developments of the invention.
[0008] Consequently, a valve according to the invention is
characterized by the fact that at least one permanent magnet is
arranged inside the valve chamber. In this case, contact between
the permanent magnet and the fluid streaming through the valve is
accepted. The advantage to this arrangement, however, is that the
permanent magnet is situated in direct proximity to the valve
housing or pole piece, and hence can be made smaller.
[0009] In a special embodiment of the invention, the design can
here be made so compact that the valve chamber fits completely
inside the control coil. In addition to the simple introduction of
magnetic lines of force for the control coil in the axial direction
of the valve chamber, this also yields additional advantages.
[0010] For example, the complete valve can be secured to the
respective site using the already provided attachment elements of
the control coil.
[0011] In a further development of the invention, at least two
permanent magnets are provided, arranged spaced apart in an axial
direction. This makes it possible to increase the stability of the
two end positions of the valve body via higher forces of attraction
of the permanent magnets, and hence to also improve the tightness
of the valve in the respective position.
[0012] In a special embodiment of the invention, the selected
polarization direction of the permanent magnet is parallel to the
direction of movement of the valve body. This polarization
direction further improves the stability of the end positions of
the valve body.
[0013] In another further development of the invention, this
polarization direction also enables the use of annular magnets,
which envelop the respective valve seat and are aligned toward the
valve chamber with the respective like pole. This embodiment can be
made especially compact. In addition, the advantage to this design
is that the resultant magnetic fields are rotationally symmetric
relative to the middle axis of the valve, which yields a good
axially parallel attraction of the valve body designed as a magnet
armature.
[0014] In a further development of the invention, these annular
magnets can be slipped onto the respective pole piece, which
preferably exhibits an annular shoulder in the area of the seal
seat for this purpose. The respective annular magnet can therefore
be mounted by simply being slipped onto the accompanying pole piece
until it hits the annular shoulder.
[0015] A spacer ring is preferably also provided, which defines the
distance between the permanent magnets, and hence between the pole
pieces. The spacer ring can therefore be used to precisely position
the pole pieces and the permanent magnets relative to each other by
simply joining them together, and then fix them in place inside the
valve housing.
[0016] The valve body is advantageously designed as a sphere. A
spherical valve body can be tightly fitted directly onto an
accompanying seal seat, e.g. a conical seat, without any additional
closure elements being required on the valve body.
[0017] In embodiments based on prior art, separate spheres were
secured as sealing elements to a valve body with correspondingly
larger dimensions. Designing the valve body as a sphere not only
gives the valve body a smaller structural shape, but also provides
for a good mobility of the valve body, with as little rubbing
against the valve chamber as possible, as well as for good
centering, e.g., in a spherical seal seat.
[0018] The slight mass of the spherical valve body also lowers the
impact pulse of the valve body on the seal seat, thereby resulting
in less noise generation and a distinctly longer service life for
the valve. The decreased load on the valve seat lessens the
requirements, and hence the complexity, associated with its
production. If necessary, the valve seat or pole piece enveloping
the valve seat does not even have to be hardened.
[0019] The valve body, in particular a spherical valve body of the
kind described above, is advantageously guided using a guide ring
inside the valve chamber, which provides the valve body with an
external guide. In a special further development of the invention,
the guide ring can simultaneously be designed as a spacer ring for
the permanent magnet(s).
[0020] A filter element is also advantageously provided to keep
dirt particles away from the seal seat, which otherwise might end
up resulting in malfunctions. Stringent requirements are placed on
tightness above all in refrigerant circuits, while the introduction
of dirt particles, e.g. during soldering procedures or other
operations, cannot be entirely avoided during the assembly of these
refrigerant circuits. Since dirt is only introduced during
production stages, a filter element with a capacity sufficient for
the one-time cleansing of fluid in the closed circulation system
can prevent the contamination of valve seats for a long time.
[0021] In a particularly advantageous embodiment of the invention,
the filter element is simultaneously designed as the guide ring for
the valve body. In addition, the filter element can also be
designed as a spacer ring between the permanent magnets. In both
structural designs, the number of required valve components is
reduced.
[0022] In a particularly advantageous further development of the
invention, a single component is simultaneously designed as a
spacer ring, guide ring and filter element, so that all three
functions can be performed by a single component, thereby
minimizing the number of components for these functions.
[0023] The valve housing is preferably designed as a circular tube.
A circular tube is particularly easy to incorporate into a control
coil, which usually exhibits a cylindrical passage. If necessary,
adapter sleeves can be provided on the outside for this purpose, to
precisely center the circular tube housing without play inside the
control coil, and improve, i.e. increase, the magnetic flux of the
control coil.
[0024] In addition, a circular tube housing offers a cylindrical
internal wall, on which flatly sealing bonds, e.g., to a pole piece
or other components, can be established.
[0025] The valve housing is also preferably designed as a single
piece, so as to avoid bonding sites with the resultant tightness
problems and inspections. In combination with a circular tube
housing, this yields a particularly simple one-piece structural
shape, in which only connecting tubes must be attached on the end
side, for example. The connecting tubes can here be soldered in, or
injected or attached on the valve housing using other known joining
methods.
[0026] At least one pole piece is advantageously provided with one
or more fluid channels outside the valve axis or outside the range
of action of the valve body, thereby resulting in a constant
connection between the inside of the valve chamber, where the valve
body is located, and the corresponding valve coupling on the side
of this pole piece. This connection between the accompanying
coupling and the valve chamber is never influenced by the motion of
the valve body. The specified fluid channel(s) can here be provided
outside or inside the pole piece (e.g., using holes or the
like).
[0027] Several peripherally distributed fluid channels are
advantageously provided to achieve a uniform flow into the valve
chamber, and hence defined flow conditions and a defined flow
resistance of the valve.
[0028] In a further development of this embodiment, a pole piece is
provided with a noncircular cross-section, so that the fluid
channel or fluid channels are formed by the resultant interspaces
between the pole piece and interior wall of the valve housing.
[0029] In one possible embodiment for these fluid channels, an
initially cylindrical pole piece is provided with external
smoothened surfaces, so that areas still continue to arise between
the resultant fluid channels where the pole piece abuts tightly
against the interior wall of the valve housing, as a result of
which the pole piece sits centrally in the valve housing.
[0030] In another advantageous embodiment of the invention, the
fluid channels are routed by the permanent magnets. This is ensured
in particular in an embodiment where one or more annular magnets
are provided, along with externally guided fluid channels. The
inflow of fluid to the one or several permanent magnets provides an
additional filtration effect by holding back magnetic particles on
the permanent magnet.
[0031] In particular in the structural design described above with
annular magnets and spacer sleeve, the valve can be assembled by
joining together the entire arrangement comprised of two pole
pieces, spacer sleeve and spherical valve body, and then attaching
and press molding and/or soldering it inside a tube. The press
molding and/or soldering can here simultaneously produce a sealing
function between one pole piece and the housing, wherein a large
contact surface is preferably provided between the housing and the
pole piece to be tightly attached, in particular when press
molding.
[0032] If necessary, sealing elements, e.g., elastomers, Teflon or
the like, can be provided for this purpose.
[0033] Other advantages can be realized by pressing in an external
bead. For example, tight-fitting internal structural components can
be fixed in place in an axial direction by one or more of these
beads.
[0034] The guide, filter and/or spacer ring is preferably designed
to allow fluid through in both the axial and radial directions.
This yields various advantages, in particular in conjunction with
fluid channels along the interior wall of the housing.
[0035] On the one hand, this ensures that the valve chamber is
completely and uniformly loaded with fluid even though the
individual annular structural elements are joined tightly together.
On the other hand, given two annular magnets, the fluid flows
toward both annular magnets, thereby improving the magnetic
filtration effect relative to magnetic dirt particles. In addition,
this provides for a thorough and uniform flow through the filter
ring, thereby ensuring that the filter ring is exposed to a uniform
load of dirt particles.
[0036] In a further development of the invention, an external
coarse filter can also be provided, e.g. a sieve insert, which is
placed inside the tubular housing.
[0037] The valve according to the invention can be designed as a
so-called 2/2-way valve. In this case, a through hole is provided
in only one pole, emptying out in a seal seat on the valve chamber
side. This pole piece is preferably tightly bonded on the outside
with the valve housing, e.g., press molded or soldered. The other
pole piece exhibits the fluid channels described above, so that
fluid can continuously be relayed to the valve chamber over the
side of this pole piece. The spherical valve armature exhibits two
stable end positions, one at each of the two pole pieces, wherein
the valve seat of the through hole of the one pole piece is either
closed or opened.
[0038] In order to achieve a symmetrical arrangement and, even with
the valve open, a well centered position of the spherical valve
armature, a corresponding blind hole with a conical seat
corresponding to the seal seat can be introduced in the pole piece
opposite the seal seat.
[0039] The invention can also be designed as a so-called 3/2-way
valve. To this end, both pole pieces are to be provided with a
corresponding through hole and a respective valve seat. In pole
pieces with outside fluid channels, a central tube is here
preferably inserted in a hole of the pole piece situated in an
extension of the through hole and tightly bonded there, e.g. press
molded or soldered. If necessary, a sealing element can here also
be provided between the central tube and the pole piece.
[0040] In the embodiment described above, the central tube is taken
out of the valve housing on the coupling side, and there bonded to
the housing, e.g. press molded or soldered. This central tube can
then be used directly as a connecting tube for the fluid circuit,
e.g. the refrigerant circuit. This central tube can simultaneously
be fixed relative to the valve housing in both a radial and axial
direction in a single assembly procedure, e.g. by press molding or
soldering.
[0041] Given the right diameter configuration, an intermediate
space is situated between the exterior wall of the central tube and
the interior wall of the valve housing, and connected with the
valve chamber via the outside fluid channels. This intermediate
space is coupled with an inflow line in the case of a 3/2-way
valve, e.g., by inserting a tube line into a corresponding hole of
the valve housing and tightly bonding it there, e.g., through
soldering.
[0042] In a special embodiment of the invention, a T-shaped or
Y-shaped tubular housing is provided from the very outset before
the internal structural components are assembled. The two pole
pieces with an annular magnet and guide, spacer or filter ring and,
if necessary, sealing elements, can here be introduced together
with the central tube into the tube housing, and fixed in a single
assembly procedure. Only the coil then still has to be slipped over
the straight, continuous portion of the tubular valve housing, and
the valve is completed.
[0043] An exemplary embodiment of the invention is shown on the
drawing, and will be described in greater detail below based on the
figures.
[0044] Shown on:
[0045] FIG. 1 is a longitudinal section through a 2/2-way valve
according to the invention, and on
[0046] FIG. 2 is a longitudinal section through a corresponding
3/2-way valve.
[0047] Valve 1 according to FIG. 1 encompasses a tubular valve
housing interspersed with a control coil 3. Adapter pieces here
ensure the good fit and increased magnetic flux of the control coil
of the valve housing 2 in the control coil 3 given deviations in
the outside diameter of the valve housing 2 from the inside
diameter of the control coil 3.
[0048] The internal structural components of the valve 1 are
situated inside the valve housing 2 in the area of the control coil
3.
[0049] Specifically, these are two pole pieces 5, 6 whose inner
ends each exhibit an annular shoulder 7, 8. Two permanent magnets
9, 10 designed as annular magnets are slipped onto the pole pieces
5, 6 until they hit the stop at the annular shoulders 7, 8. Placed
between the permanent magnets 9, 10 is a spacer ring 11, which
simultaneously serves as the filtering element and guide ring for a
spherical valve body 12. The valve body 12 is made out of a
magnetic or magnetizable material, and hence used directly as the
valve armature.
[0050] The pole piece 5 incorporates a through hole 13 that empties
out in what is here a spherical valve seat 14, but which can also
be designed differently, e.g. as a conical seat, inside the valve
chamber 15. The opposing pole piece 6 exhibits only a blind hole 16
with a spherical seat 17 on the end side, which can also be
differently designed, e.g. as a spherical seat, for the valve body
12.
[0051] The outside of the pole piece 6 is provided with smoothened
surfaces 18, thereby forming fluid channels 19 between the pole
piece 6 and the valve housing 2 at this location.
[0052] All internal structural elements of the valve 1 are press
molded between two peripherally running beads 20, 21 in the valve
housing 2, and hence fixed in the axial direction.
[0053] Accommodated on the end side of the valve housing 2 are two
connecting tubes 22, 23, with which the valve can be connected to
the respective fluid circuit. In this exemplary embodiment, the
connecting tubes 22, 23 are molded onto the valve housing 2 as a
single piece, so that this location has no bonding site, and hence
no sealing problems.
[0054] The fluid is supplied to the valve 1 according to FIG. 1 via
the connecting tube 23. The fluid passes through the fluid channels
19 between the pole piece 6 and the valve housing 2 and enters into
the area of the valve chamber 15. It here first flows on the
outside along the permanent magnet 10, and then gets into the
spacer ring 11, which is permeable in both the radial and axial
directions. As a result, the flow also passes to the opposing
permanent magnet 9. The permanent magnets 9, 10 have a smaller
outside diameter relative to the inside diameter of the valve
housing 2, so that sufficient space remains between the permanent
magnets 9, 10 and the valve housing 2 for the flow of fluid, and
for the accumulation of magnetic dirt particles. The spacer ring 11
also serves as a mechanical filter element to trap nonmagnetic dirt
particles in the fluid before they can penetrate inside the valve
chamber 15. At the same time, the spacer ring 11 provides a guide
for the spherical valve body 12.
[0055] In the switch setting of the valve 1 shown, the 2/2-way
valve is closed, i.e. the valve body 12 rests on the valve seat 14,
and seals off the through hole 13. Actuating the control coil 3
makes it possible to switch the valve body 12 to the opposite
position, in which it hits the spherical seat 17, thereby opening
the through hole 13 to the inside of the valve chamber 15. In this
switch setting, the fluid can flow via the through hole 13 all the
way to the connecting tube 22.
[0056] The permanent magnets 9, 10 are polarized in such a way as
to align the respective like poles toward the inside, i.e. toward
the spacer ring 11, and the corresponding other poles toward the
connecting tube 22, 23. The permanent magnets 9, 10 are hence
polarized in a direction parallel to the valve axis. This yields a
permanent magnetic field in the area of the valve seat 14 or
spherical seat 17, which holds the valve body 12 in the respective
end position. The bistable configuration of the valve 1 is realized
in this way.
[0057] The permanent magnets 9, 10 can be given very small
dimensions by arranging them inside the valve housing 2 in direct
proximity to the valve body 12. In addition, arranging the
permanent magnets 9, 10 in the area of the valve seat 14 or
spherical seat 17, i.e. in the area of the end position of the
valve body 12, allows them to exert their forces particularly well,
thereby ensuring a good sealing function or stable switch setting,
even given magnets with comparatively small dimensions.
[0058] The valve arrangement according to FIG. 2 essentially
corresponds to the exemplary embodiment described above. The
difference is that the valve according to FIG. 2 is designed as a
3/2-way valve.
[0059] To this end, the connecting tube 23 has inserted into it a
central tube 24 extending all the way to the pole piece 6, which is
provided with a location hole 25 to accommodate the central tube
24.
[0060] The location hole 25 in the pole piece 6 is extended to
inside the valve chamber 15 by a through hole 26. A spherical or
conical valve seat 27 is accommodated in the pole piece 6 in the
outlet area, which is opened or closed alternating with the valve
seat 14, depending on the switch setting of the valve.
[0061] An intermediate space 29 connected to an inflow line 31 via
a hole 30 results between the central tube 24 and the casing area
28.
[0062] In the embodiment shown, a sealing element 32 is also
inserted into an annular groove 33 of the pole piece 5 and, as
evident from an outer bead 34, press molded or soldered.
[0063] The 3/2-way valve according to FIG. 2 has an inflow line 31
and two output lines. One of the output lines is comprised of the
connecting tube 22 as in the aforementioned exemplary embodiment,
but the other output line is now formed by the connecting tube 23,
which served as an inflow line in the 2/2 way model.
[0064] Inflow takes place via the intermediate space 29 toward the
fluid channels 19. As in the aforementioned exemplary embodiment,
the flow passes to the permanent magnets 9, 10 and the spacer and
guide ring 11. The permanent magnets 9 and 10 here also act as
magnetic filter elements to hold back the magnetic dirt particles,
while the spacer and guide ring 11 is designed as a filter ring
permeable to fluid in a radial and axial direction. The fluid gets
inside the valve chamber 15 in this way.
[0065] The fluid can now escape either via the through hole 13 or,
depending on the switch setting of the valve, via the through hole
26. In the switch position shown, the valve seat 14 is closed by
the valve body 12, while the valve seat 27 is open. The fluid hence
streams toward the output line 23 in this switch setting.
[0066] After a control pulse is relayed through the control coil 3
to initiate a switchover, the valve seat 27 is closed, and the
valve seat 14 is opened at the same time, so that the fluid streams
via the through hole 13 toward the connecting tube 22. The control
coil 3 and permanent magnets 9 and 10 here operate exactly as in
the aforementioned exemplary embodiment.
[0067] As illustrated by the sealing element 32, care must be taken
to establish as tight a seal as possible between the one pole piece
5 and the valve casing 2. The annular sealing element used to
accomplish this is only an example. Flat press molding or soldering
would also be possible. This type of arrangement would correspond
to the exemplary embodiment depicted based on FIG. 1.
[0068] The central tube 24 must be sealed relative to the pole
piece 6 in a corresponding manner. If required, a sealing element
can here also be used in a manner not shown in any greater detail.
In the embodiment according to FIG. 2, the central tube 24 abuts
flatly, thereby resulting in a tight seal via press molding or
soldering.
[0069] As shown on FIG. 2, the central tube 24 can be fixed in both
the axial and radial directions via press molding or soldering,
which becomes evident based on the bead 20 abutting the central
tube 24. In this case, care must be taken to ensure that the bead
20 does not abut around the entire periphery, so that a sufficient
passage always remains open between the intermediate space 29 and
the fluid channels 19.
[0070] The depicted embodiments represent extremely compact
structural designs that can be manufactured with an exceedingly
small production expense, while ensuring a reliable long-term
stability given a high tightness. In particular, the reduced mass
of the valve body 12 also decreases the respective impact pulse on
the valve seats 14, 27, thereby resulting in a better wear
resistance by comparison to previously known valves in addition to
lower operating noise levels.
Reference List:
[0071] 1 Valve
[0072] 2 Valve housing
[0073] 3 Control coil
[0074] 4 Adapter piece
[0075] 5 Pole piece
[0076] 6 Pole piece
[0077] 7 Annular shoulder
[0078] 8 Annular shoulder
[0079] 9 Permanent magnet
[0080] 10 Permanent magnet
[0081] 11 Spacer ring
[0082] 12 Valve body
[0083] 13 Through hole
[0084] 14 Valve seat
[0085] 15 Valve chamber
[0086] 16 Blind hole
[0087] 17 Spherical seat
[0088] 18 Smoothened surface
[0089] 19 Fluid channel
[0090] 20 Bead
[0091] 21 Bead
[0092] 22 Connecting tube
[0093] 23 Connecting tube
[0094] 24 Central tube
[0095] 25 Location hole
[0096] 26 Through hole
[0097] 27 Valve seat
[0098] 28 Housing area
[0099] 29 Intermediate space
[0100] 30 Hole
[0101] 31 Inflow line
[0102] 32 Sealing element
[0103] 33 Annular groove
[0104] 34 Bead
* * * * *