JP2017155830A - Capacity control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacity control valve capable of improving pressure resistance performance.SOLUTION: A diaphragm body 34 has a deformation surface part 341, and a cylindrical part 342 extending substantially orthogonally to the deformation surface part 341. The diaphragm body 34, an upper lid 35 and a lower lid 36 are connected at the cylindrical part 342 and cylindrical holding parts 352, 362. Consequently, even when fluid pressure acts on the deformation surface part 341 and force in a direction substantially perpendicular to the deformation surface part 341 is applied, failure such as a crack hardly occurs at the connected portions, to improve pressure resistance performance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a capacity adjustment valve in which a valve space for accommodating a valve member and an urging member space for accommodating an urging member are partitioned by a diaphragm body.

  2. Description of the Related Art Conventionally, as a capacity adjustment valve that short-circuits a high pressure side and a low pressure side in a refrigeration cycle in which a refrigerant circulates, a valve having a diaphragm (diaphragm body) has been proposed (see, for example, Patent Document 1). In the valve device (capacity adjusting valve) described in Patent Document 1, the space in the capacity adjusting valve is divided into an upper chamber in which a spring (biasing member) is provided by a diaphragm and a passage on the outflow side (secondary side). The valve is opened when the pressure in the passage on the outflow side is low, and is closed when the pressure is high.

Japanese Utility Model Publication No. 53-105040

  However, in the valve device of Patent Document 1, a plate-like diaphragm is sandwiched between the upper and lower lids, and if a large force is applied to the diaphragm due to high pressure in the passage, the joint between the lid and the diaphragm is cracked. There is a possibility that the airtightness may not be maintained due to a problem such as the above.

  An object of the present invention is to provide a capacity adjusting valve capable of improving pressure resistance performance.

  The capacity adjustment valve of the present invention is a capacity adjustment valve in which a valve space for accommodating a valve member and an urging member space for accommodating an urging member are partitioned by a diaphragm body. A first holding member and a second holding member that sandwich and hold the diaphragm body from the side of the biasing member space, and the diaphragm body includes at least one of the valve space side and the biasing member space side The first holding member and the second holding member are formed in a bottomed cylindrical shape having a disc-shaped deformable surface portion that can be convexly deformed on one side, and a tubular portion continuous to the outer peripheral edge of the deformed surface portion. The holding member has an annular portion that is sandwiched while exposing a central portion of the deformation surface portion, and a cylindrical sandwiching portion that sandwiches the cylindrical portion, and the cylindrical portion, the first holding member, and the first 2 The cylindrical holding part of the holding member is joined And wherein the are.

  According to the present invention, the diaphragm body has the cylindrical portion, the first holding member and the second holding member have the cylindrical clamping portion, and these are joined together, so that the diaphragm body, the holding member, Are joined at a portion extending so as to intersect the deformation surface portion. Here, when the pressure of the fluid acts on the deformed surface portion, a force in a direction substantially perpendicular to the deformed surface portion is applied, and the diaphragm body and the holding member tend to be separated by this force. In the present invention, the portion extending so as to intersect the deformation surface portion is joined, so that the portion in a direction substantially perpendicular to the deformation surface portion is compared with the configuration in which the portion extending parallel to the deformation surface portion is joined. Strength against force can be improved. Therefore, even if the fluid pressure acts on the deformed surface portion, it is difficult for defects such as cracks to occur in the joined portion, and the pressure resistance performance can be improved. In addition, the cylindrical part is not limited to the one extending so as to be orthogonal to the deformation surface part, and may be a truncated cone shape.

  At this time, in the capacity adjustment valve of the present invention, it is preferable that the cylindrical clamping portion extends so as to be orthogonal to the deformation surface portion. According to such a configuration, the pressure resistance can be further improved by forming the joint portion at a portion extending perpendicular to the deformed surface portion.

  Furthermore, in the capacity adjustment valve of the present invention, in the first holding member, the annular portion extends along the deformed surface portion, and the second holding member linearly contacts the deformed surface portion. It is preferable to have. According to such a configuration, the deformable surface portion is sandwiched between the planar annular portion and the line contact portion, and the deformable surface portion can be held at a high pressure using the line contact portion as a fulcrum for deformation.

  In the capacity adjustment valve of the present invention, the second holding member is disposed inside the cylindrical portion, and a curved portion between the annular portion and the cylindrical clamping portion faces the deformation surface portion. It is preferable that the curved portion functions as the line contact portion by being formed in a convex shape. According to such a configuration, the curved portion between the annular portion and the cylindrical sandwiching portion functions as a line contact portion, so that it is not necessary to provide a projection as a line contact portion, and the structure is simplified. Can do. Further, the curved portion of the second holding member disposed inside the cylindrical portion of the diaphragm body serves as a fulcrum for deformation of the deformable surface portion, whereby the fulcrum is arranged by arranging the second holding member inside the cylindrical portion. Positioning can be performed, and the shift of the fulcrum position in the deformation surface portion can be suppressed. Therefore, the force required to deform the diaphragm body is unlikely to fluctuate, and the load applied to the diaphragm body can be easily managed.

  Moreover, in the capacity | capacitance adjustment valve of this invention, it is preferable that the said cylindrical part is extended toward the said valve space side from the said deformation | transformation surface part. According to such a configuration, when the valve housing has a unit (main body unit) that accommodates the valve member and a unit (cap unit) that accommodates the biasing member, and these are assembled, A cylindrical part and a cylindrical clamping part can be made easy to join.

  According to the capacity adjusting valve of the present invention, the tubular portion of the diaphragm body is sandwiched and joined by the tubular sandwiching portion of the holding member, whereby the pressure resistance performance can be improved.

It is sectional drawing which shows the capacity | capacitance adjustment valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the cap unit of the said capacity | capacitance adjustment valve. It is an exploded view which shows the said cap unit. It is sectional drawing which shows the principal part of the said cap unit. It is sectional drawing which shows the capacity | capacitance adjustment valve which concerns on 2nd Embodiment of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the capacity adjustment valve 1 </ b> A of the present embodiment includes a main unit 20 and a cap unit 30, and is provided so as to bypass the discharge side and the suction side of the compressor in the refrigeration cycle, for example. . In the present embodiment, the operation direction of the valve (the axial direction L of the main unit 20 and the cap unit 30) is defined as the Z direction, and two directions substantially orthogonal to the Z direction are defined as the X direction and the Y direction. In the following, the upper and lower directions in the Z direction are based on FIG.

  The main unit 20 includes a valve housing 21, an inlet joint 22, an outlet joint 23, a valve member 24, a seat 25, and a seat spring 26.

  The valve housing 21 is formed in a cylindrical shape extending along the Z direction, and accommodates the valve member 24, the seat 25, and the seat spring 26. An opening on the lower end side in the Z direction of the valve housing 21 becomes an inlet connection hole 211 to which the inlet joint 22 is connected, and an outlet connected to the side surface of the valve housing 21 so that the outlet joint 23 extends along the X direction. A connection hole 212 is formed. A space inside the valve housing 21 is defined as a valve space S1.

  The valve member 24 includes a rod-shaped portion 241 that extends along the Z direction, a valve body 242 provided on the lower end side of the rod-shaped portion 241, a plate portion 243 provided on the upper end side, and a seat spring support member 252 described later. A seal member 244 accommodated in the through hole and an adjustment nut 245 for fixing the plate portion 243 to the rod-shaped portion 241 are provided. The valve body 242 is formed in a cylindrical shape opened on the upper end side in the Z direction, and has a first valve portion 242A on the lower end side and a second valve portion 242B on the upper end side.

  The first valve portion 242A is disposed in the vicinity of the inlet connection hole 211 in the valve housing 21, is formed in a rhombus shape in a cross section along the ZX plane, and an upper surface inclined with respect to the Z direction is formed on a first valve seat 251A described later. Sitting and leaving. In addition, a communication hole 242C is formed on the lower surface of the first valve portion 242A. Accordingly, a communication passage S2 is formed between the outer peripheral surface of the rod-shaped portion 241 and the inner peripheral surface of the valve body 242 so that fluid can flow in from the communication hole 242C and flow out from the opening at the upper end. . Further, the second valve portion 242B is seated and separated from a second valve seat 251B described later.

  The plate portion 243 is configured to receive an upward force in the Z direction when its lower surface abuts against the seat spring 26. Further, the mounting position of the plate portion 243 with respect to the rod-shaped portion 241 can be adjusted by an adjusting nut 245. The seal member 244 is made of a slidable member such as a fluororesin, and the inner peripheral surface thereof is provided along the outer peripheral surface of the rod-shaped portion 241. Therefore, as will be described later, when the valve member 24 moves along the Z direction, the outer peripheral surface of the rod-shaped portion 241 and the inner peripheral surface of the seal member 244 are in sliding contact.

  The seat 25 includes a valve seat member 251 in which two valve seats 251A and 251B are formed, and a seat spring support member 252 that is provided above the valve seat member 251 and supports the seat spring 26. The valve seat member 251 and the seat spring support member 252 are fixed to each other by screwing together or by press-fitting the other into one.

  A first valve seat 251A is formed in the valve seat member 251 so as to open at the lower end thereof, and a second valve seat 251B is formed thereabove. When the first valve portion 242A is seated on the first valve seat 251A, the second valve portion 242B is also seated on the second valve seat 251B at the same time, and when the first valve portion 242A is separated from the first valve seat 251A. The second valve portion 242B is also separated from the second valve seat 251B at the same time.

  The seat spring support member 252 is formed in a disk shape along the inner peripheral surface of the valve housing 21. The seat spring support member 252 is formed with a hole penetrating vertically, so that the valve space S1 is not partitioned by the seat spring support member 252. In addition, a through hole through which the rod-shaped portion 241 of the valve member 24 is inserted is formed at a substantially central portion of the seat spring support member 252. A step for locking the seal member 244 of the valve member 24 is formed in the through hole, and the seal member 244, the small spring 252A, and the inner peripheral surface of the through hole are screwed therein. The adjustment bolt 252B is accommodated in order from the lower side. That is, the seal member 244 and the small spring 252A are sandwiched between the adjustment bolt 252B and the step formed in the through hole so that the seal member 244 is pressed against the step by the restoring force generated in the compressed small spring 252A. It has become. At this time, the compression amount of the small spring 252A can be changed by the adjusting bolt 252B.

  Such a seat 25 is arranged so that the valve seat member 251 closes the inlet connection hole 211 together with the first valve portion 242A, and is screwed into the step at the lower end of the valve housing 21 and the inner peripheral surface of the valve housing 21. It is sandwiched between the seat presser 27 and fixed to the valve housing 21. Further, a seal member 28 is provided between the valve seat member 251 and the valve housing 21, and from the inlet passage S5 in the inlet joint 22 to the valve space S1 other than the opening of the first valve seat 251A and the communication passage S2. Fluid is prevented from flowing in.

  The seat spring 26 is disposed between the seat spring support member 252 and the plate portion 243 of the valve member 24 while being compressed from a natural state. Since the seat 25 is fixed to the valve housing 21, the seat spring 26 biases the valve member 24 upward. At this time, since the attachment position of the plate portion 243 can be adjusted by the adjustment nut 245, the amount of compression of the seat spring 26 can be changed and the urging force can be adjusted.

  The cap unit 30 is provided so as to close the opening at the upper end in the Z direction of the valve housing 21, and as shown in FIG. 2, a cap body 31, a cap nut 32, and a coil spring 33 as an urging member, The diaphragm body 34, the upper lid 35 as the first holding member, the lower lid 36 as the second holding member, the abutment 37, the abutment plate 38, and the adjusting bolt 39 are provided.

  The cap body 31 is formed in a cylindrical shape extending along the Z direction and accommodates the coil spring 33. An opening at the upper end in the Z direction of the cap body 31 is closed by a cap nut 32, and an upper cover 35 is fixed to the lower end by brazing and a contact plate 38 is provided so as to close the opening. A seal member 311 is provided between the cap body 31 and the cap nut 32.

  The coil spring 33 is disposed so as to be compressed from a natural state so as to be sandwiched between the contact plate 38 and the adjusting bolt 39 in the Z direction. The adjustment bolt 39 is screwed into the inner peripheral surface of the cap body 31 so that the amount of compression of the coil spring 33 can be adjusted.

  The diaphragm body 34 is made of, for example, stainless steel, and as shown in FIG. 3, as shown in FIG. Are formed in a bottomed cylindrical shape. In the diaphragm body 34, the deformable surface portion 341 extends along the XY plane, and the tubular portion 342 extends from the deformable surface portion 341 toward the lower side in the Z direction, that is, the tubular portion 342 is substantially formed on the deformable surface portion 341. It extends so as to be orthogonal. The diaphragm body 34 is overlaid with a plate-like auxiliary diaphragm 34 </ b> A on the upper surface of the deformable surface portion 341 (that is, the side opposite to the cylindrical portion 342).

  The auxiliary diaphragm 34 </ b> A has a substantially equal thickness with the same material as the diaphragm body 34, and is configured in a disk shape. The material and thickness of the auxiliary diaphragm 34A may be set as appropriate according to the required pressure resistance performance, deformation characteristics (responsiveness to pressure), and the like, and may be different from the deformation surface portion 341. Further, the outer shape (the shape of the outer peripheral edge) of the auxiliary diaphragm 34A is not limited to a circular shape, and may be a polygonal shape, and is actually deformed by forming a fulcrum of deformation by the upper lid 35 and the lower lid 36. The part may be circular. Further, the configuration is not limited to the configuration in which only one auxiliary diaphragm is provided, and a plurality of auxiliary diaphragms may be provided, and the materials and thicknesses of the plurality of auxiliary diaphragms may be the same or different from each other. Good. Moreover, it is good also as a structure by which an auxiliary diaphragm is not provided.

  The upper lid 35 and the lower lid 36 sandwich and hold the diaphragm body 34 from the upper and lower sides in the Z direction. The annular lid portions 351 and 361 that sandwich the diaphragm body 34 while exposing the central portion of the deformable surface portion 341, and the cylindrical portion And cylindrical sandwiching portions 352 and 362 for sandwiching 342. The cylindrical sandwiching portions 352 and 362 extend from the annular portions 351 and 361 toward the lower side in the Z direction.

  The annular portion 351 of the upper lid 35 extends in a planar shape along the XY plane (along the deformed surface portion 341) in the outer peripheral portion, and in the central portion, the XY plane extends toward the upper side toward the center. It extends with an inclination. On the other hand, the annular portion 361 of the lower lid 36 is inclined with respect to the XY plane so as to go upward as it goes from the center toward the outer peripheral side, and the diaphragm body 34 and the auxiliary diaphragm 34A are deformed to be convex downward. It can be done. Further, a curved portion 364 between the annular portion 361 and the cylindrical sandwiching portion 362 is formed in a convex shape toward the deformation surface portion 341, and the curved portion 364 contacts the deformation surface portion 341. Further, the lower lid 36 has a support cylinder part 363 that is continuous with the inner peripheral edge of the annular part 361 and extends downward in the Z direction, and an abutment 37 is disposed inside the support cylinder part 363 for support. It has come to be.

  The diaphragm body 34 and the auxiliary diaphragm 34A are arranged inside the cylindrical clamping part 352 of the upper lid 35, and the lower cover 36 is arranged inside the cylindrical part 342 of the diaphragm body 34, whereby the diaphragm body 34 and the auxiliary diaphragm 34A. Is sandwiched between the upper lid 35 and the lower lid 36. At this time, the abutment 37 is sandwiched between the diaphragm body 34 and the lower lid 36. Further, the cylindrical portion 342 and the cylindrical sandwiching portions 352 and 362 are in contact with each other in the radial direction so that the relative positions of the members are not displaced inside the cylinder. In such a state, the diaphragm body 34 and the auxiliary diaphragm 34A are held by the upper lid 35 and the lower lid 36 by joining the tubular portion 342 and the tubular sandwiching portions 352 and 362 by welding.

  At this time, as shown in FIG. 4A, the cylindrical portion 342 before welding has its tip 342A protruding beyond the tips 352A and 362A of the cylindrical sandwiching portions 352 and 362. At the time of welding, first, the tip 342A of the cylindrical portion 342 is melted to cover the tips 352A and 362A of the cylindrical sandwiching portions 352 and 362 with the deformed tip 342A as shown in FIG. 4B. Moreover, the part which the cylindrical part 342 and the cylindrical clamping parts 352 and 362 overlap is welded, and it joins in joining area | region A1. In addition, the joining method of the cylindrical part 342 and the cylindrical clamping parts 352 and 362 is not limited to welding, A friction stir welding etc. may be sufficient.

  In this way, the diaphragm body 34 held by the upper lid 35 and the lower lid 36 has the deformed surface portion 341 disposed along the lower surface of the annular portion 351 of the upper lid 35 and the curved portion 364 of the lower lid 36 in linear contact. The curved portion 364 functions as a line contact portion. That is, the deformable surface portion 341 can be convexly deformed downward with a portion sandwiched between the lower surface of the annular portion 351 and the curved portion 364 as a fulcrum.

  In the cap unit 30 as described above, the outer peripheral surface of the support cylinder portion 363 of the lower lid 36 is a male screw, and the inner peripheral surface of the upper end opening of the valve housing 21 in the main unit 20 is a female screw. Is possible. That is, the cap unit 30 is assembled to the main unit 20 by screwing the male screw portion of the lower lid 36 and the female screw portion of the valve housing 21. At this time, by providing the sealing member 40 between the upper end of the valve housing 21 and the lower surface of the annular portion 361 of the lower lid 36, the valve space S1 does not communicate with the external space, and the valve space S1 is sealed. .

  Hereinafter, the force that acts on the diaphragm body 34 in the capacity adjustment valve 1A and the deformation modes thereof will be described. It should be noted that the same force is applied to the auxiliary diaphragm 34A and is similarly deformed, and the description of the auxiliary diaphragm 34A is omitted.

  First, the diaphragm body 34 receives a downward force through the contact plate 38 by the coil spring 33 of the cap unit 30 and an upward force through the contact member 37 by the valve member 24 of the main unit 20. receive. That is, the valve member 24 is urged by the seat spring 26 as described above, and the upper end of the valve member 24 abuts against the metal plate 37 from below to apply a force to the diaphragm body 34.

  Further, the diaphragm body 34 receives a force due to a pressure difference between the internal space (the urging member space accommodating the coil spring 33) S3 of the cap unit 30 and the valve space S1 of the valve housing 21. The internal space S3 of the cap unit 30 is a closed space, and its pressure is substantially constant. On the other hand, the valve space S1 of the valve housing 21 communicates with the outlet channel S4 in the outlet joint 23, and the pressure thereof is substantially equal to the pressure (secondary pressure) in the outlet channel S4. That is, when the secondary side pressure becomes higher than the pressure in the internal space S3, an upward force is applied to the diaphragm body 34.

  When the pressure in the valve space S1 is lower than a predetermined reference pressure, the downward force is larger than the upward force applied to the diaphragm body 34, and the diaphragm body 34 is convex downward. As a result, the valve member 24 moves downward, and the valve portions 242A and 242B are separated from the valve seats 251A and 251B, thereby opening the valve. On the other hand, when the pressure in the valve space S1 is higher than a predetermined reference pressure, the downward force is smaller than the upward force applied to the diaphragm body 34, and the diaphragm body 34 is substantially along the XY plane. Flattened. At this time, the valve member 24 is urged upward by the seat spring 26 and moves upward as the diaphragm body 34 is deformed, and the valve portions 242A and 242B are seated on the valve seats 251A and 251B. Closed. The diaphragm body 34 may be convexly inverted upward and downward, or may be convex upward in the valve closed state.

  Here, the flow of fluid in the valve open state and the valve closed state will be described. First, in the valve open state, the inlet flow path S5 in the inlet joint 22 is directly communicated with the valve space S1 and indirectly communicated via the communication path S2 of the valve member 24. That is, the fluid in the inlet flow path S5 passes through the opening of the first valve seat 251A and flows into the valve space S1, and also passes through the communication path S2 and the gap between the second valve portion 242B and the second valve seat 251B. Into the valve space S1. The fluid that flows into the valve space S1 flows into the outlet channel S4.

  On the other hand, in the valve closed state, the first valve seat 251A is closed by the first valve portion 242A, and fluid cannot pass therethrough. Further, a closed space is formed between the second valve portion 242B, the second valve seat 251B, and the lower surface of the seat spring support member 252, and the communication path S2 does not communicate with the valve space S1. Therefore, the fluid in the inlet channel S5 does not flow into the valve space S1.

  According to this embodiment, there are the following effects. That is, the diaphragm body 34, the upper lid 35, and the lower lid 36 are joined at the cylindrical portion 342 and the cylindrical clamping portions 352 and 362, which are portions extending so as to be substantially orthogonal to the deformation surface portion 341. Even if a fluid pressure acts on the deformable surface portion 341 and a force in a direction substantially perpendicular to the deformable surface portion 341 is applied, defects such as cracks are hardly generated in the joined portion, and the pressure resistance performance can be improved.

  Further, the deformable surface portion 341 is sandwiched between the annular portion 351 along the deformable surface portion 341 and the curved portion 364 that is linearly contacted, so that the deformable surface portion 341 is used as a fulcrum for deformation at a high pressure. Can be held.

  Furthermore, since the curved portion 364 between the annular portion 361 and the cylindrical sandwiching portion 362 functions as a line contact portion, there is no need to provide a projection as a line contact portion, and the structure can be simplified. Further, the bent portion 364 of the lower lid 36 disposed inside the cylindrical portion 342 of the diaphragm body 34 serves as a fulcrum for deformation of the deformation surface portion 341, whereby the lower lid 36 is disposed inside the cylindrical portion 342. Thus, the fulcrum can be positioned, and the shift of the fulcrum position in the deformation surface portion 341 can be suppressed. Therefore, the force required to deform the diaphragm body 34 is unlikely to fluctuate, and the load applied to the diaphragm body 34 can be easily managed.

  Further, the diaphragm body 34 is provided at the lower end of the cap unit 30 and the cylindrical portion 342 extends downward from the deformable surface portion 341 (on the main body unit 20 side). The part 342 and the cylindrical sandwiching parts 352 and 362 can be easily joined.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 5, the capacity adjustment valve 1 </ b> B of the present embodiment includes a main unit 20 </ b> B and a cap unit 30. That is, the capacity adjustment valve 1B is obtained by replacing the main body unit 20 of the capacity adjustment valve 1A of the first embodiment with a main body unit 20B.

  The main unit 20B includes a valve housing 21, an inlet joint 22, an outlet joint 23, a valve member 24B, a seat 25B, and a seat spring 26. That is, the main unit 20B includes a valve member 24B and a seat 25B instead of the valve member 24 and the seat 25.

  The valve member 24B has one valve portion 246 at its lower end. Further, no communication passage or the like is formed in the valve member 24B. Further, the seat 25B has one valve seat 253 on which the valve portion 246 of the valve member 24B is seated and separated. Therefore, when the diaphragm body 34 protrudes downward and the valve member 24B is in the valve open state, the fluid in the inlet joint 22 passes through the opening of the valve seat 253, and the diaphragm body 34 protrudes upward. When the valve member 24B is closed, the fluid in the inlet joint 22 does not pass through the opening of the valve seat 253. According to this embodiment, the same effect as the first embodiment can be obtained.

  The present invention is not limited to the first and second embodiments, but includes other configurations and the like that can achieve the object of the present invention. The following modifications are also included in the present invention. For example, in the first embodiment, the cylindrical portion 342 of the diaphragm body 34 is formed in a cylindrical shape, but the cylindrical portion only needs to extend so as to intersect the deformation surface portion, and is cylindrical. However, the shape is not limited to a truncated cone. At this time, the cylindrical clamping part should just have the shape according to the cylindrical part.

  In the first embodiment, the curved portion 364 of the lower lid 36 functions as a line contact portion. However, a protrusion or the like as a line contact portion may be provided on the upper surface of the annular portion of the lower lid. . Moreover, the line contact part may be provided in the upper cover. Further, none of the annular portions of the pair of holding members may be in line contact, and may be a fulcrum of deformation of the deformation surface portion by surface contact.

  In the first embodiment, the cylindrical portion 342 extends from the deformable surface portion 341 toward the main body unit 20, but the cylindrical portion may extend toward the opposite side. The extending direction may be appropriately selected according to the size and shape of each part of the capacity adjustment valve.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A, 1B Capacity adjustment valve 24, 24B Valve member 33 Coil spring (biasing member)
34 Diaphragm body 341 Deformation surface portion 342 Cylindrical portion 35 Upper lid (first holding member)
351 Annular part 352 Cylindrical clamping part 36 Lower lid (second holding member)
361 Annular part 364 Curved part (Line contact part)
S1 valve space S3 internal space (biasing member space)

Claims (5)

A capacity adjusting valve in which a valve space for accommodating a valve member and an urging member space for accommodating an urging member are partitioned by a diaphragm body,
A first holding member and a second holding member that hold the diaphragm body sandwiched from the valve space side and the biasing member space side;
The diaphragm body includes a disc-shaped deformable surface portion that can be convexly deformed to at least one of the valve space side and the biasing member space side, and a cylindrical portion continuous to the outer peripheral edge of the deformable surface portion, Having a bottomed cylindrical shape,
The first holding member and the second holding member each have an annular portion that is sandwiched while exposing a central portion of the deformation surface portion, and a cylindrical sandwiching portion that sandwiches the tubular portion,
The capacity adjustment valve, wherein the tubular portion and the tubular holding portions of the first holding member and the second holding member are joined.   The capacity adjustment valve according to claim 1, wherein the cylindrical clamping portion extends so as to be orthogonal to the deformation surface portion.   The said 1st holding member WHEREIN: While the said cyclic | annular part extends along the said deformation | transformation surface part, the said 2nd holding member has a line contact part which contacts a linear form with respect to the said deformation | transformation surface part. Or the capacity adjustment valve of 2.   The second holding member is disposed inside the tubular portion, and a curved portion between the annular portion and the tubular sandwiching portion is formed in a convex shape toward the deformed surface portion. The capacity adjusting valve according to claim 3, wherein the curved portion functions as the line contact portion.   The capacity adjusting valve according to any one of claims 1 to 4, wherein the cylindrical portion extends from the deformable surface portion toward the valve space.

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