JP2018189126A - Spring receiving member and valve assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring receiving member capable of coping with springs of various sizes while improving strength, and a valve assembly including the spring receiving member.SOLUTION: As a spring receiving member 4 has a cylindrical portion 42 extended in an X-direction which is a reciprocating direction of a spool, as an axial direction, strength of the spring receiving member 4 can be secured even on a position free from groove portions 422, 423. Through holes 424, 427 are formed on positions holding the groove portions 422, 423 of the cylindrical portion 42, thus a part of a spring can be disposed or penetrated in the through holes 424, 427, and the large-sized spring can be used. The through holes 424, 427 are independent from each other, and a pillar portion is formed therebetween, so that the strength of the cylindrical portion 42 hardly degrades even through the through holes are formed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a valve assembly for switching a fluid flow path and a spring receiving member provided in the valve assembly.

  In general, a diaphragm pump having a pair of pump chambers and discharging fluid by reciprocating movement of a center rod is provided with a switching device for switching which of the pair of working fluid chambers is supplied with the working fluid. As such a switching device, a device provided with a wire spring has been proposed so that a reciprocating spool does not stop at a neutral position (see, for example, Patent Document 1). In the conventional switching device described in Patent Document 1, a pair of wire springs is locked in a groove of a spring receiving body (spring receiving member) so that the spring contracts most when the spool is positioned at the neutral position. It has become. As a result, the spool is biased away from the neutral position, and the stop at the neutral position is prevented.

JP 2014-214629 A

  However, in the spring receiver of the switching device described in Patent Document 1, two upright portions formed with grooves for locking the springs extend along the reciprocating direction, and the upright portions are thinned by the grooves. Therefore, it was difficult to ensure the strength. That is, when the spool reciprocates and repeatedly collides with the spring receiver, the upright portion is easily damaged, and it is difficult to improve durability.

  In view of this, a spring receiving member having a cylindrical upright portion (tubular portion) may be used, and a spring locking groove may be formed on the inner surface of the cylindrical portion. In such a configuration, although strength can be ensured by a portion of the cylindrical portion where no groove is formed, the entire spring must be accommodated inside the cylindrical portion, and the spring needs to be downsized. . If the degree of freedom in design of the spring is low, the degree of freedom in setting the urging force at the neutral position and the distance (stroke length) in which the spool can reciprocate is reduced. Thus, it has been difficult to achieve both improvement in the strength of the spring receiving member and improvement in the design freedom of the spring.

  An object of the present invention is to provide a spring receiving member capable of accommodating various springs while improving strength, and a valve assembly including the spring receiving member.

  The spring receiving member of the present invention has an annular or C shape so as to follow a crossing surface of the spool that switches the flow path of the working fluid by reciprocating between the first position and the second position and the reciprocating direction of the spool. And a biasing unit having a pair of springs that are formed in a letter shape and bias the spool away from the neutral position in the reciprocating direction. A plate portion that restricts movement to one side of the plate portion, and a tube portion that extends continuously in the outer periphery of the plate portion with the reciprocating direction as an axial direction and accommodates the urging unit. A pair of grooves extending along the circumferential direction and locking the spring are formed on the inner surface at positions facing each other, and the cylindrical portion is located at a position sandwiching the pair of grooves from the circumferential direction. Independent, wherein a pair of through holes are formed.

  According to the present invention as described above, the strength of the spring receiving member can be ensured at the position where the groove portion is not formed by having the cylindrical portion extending with the reciprocating direction of the spool as the axial direction. In addition, since the through hole is formed at a position sandwiching the groove portion in the cylindrical portion, a part of the spring can be disposed or penetrated in the through hole, and a large spring can be used. At this time, the through-holes are independent from each other (that is, the through-hole formed next to one groove and the through-hole formed next to the other groove are not continuous, and a total of four through-holes are formed. Therefore, even if the through hole is formed, the strength of the spring receiving member is hardly lowered.

  On the other hand, the valve assembly of the present invention has an annular shape or a cross-section along a crossing surface of the spool that switches the flow path of the working fluid by reciprocating between the first position and the second position, and the reciprocating direction of the spool. An urging unit having a pair of springs formed in a C shape and urging the spool away from a neutral position in the reciprocating direction, the spring receiving member according to claim 1, and the spool An assembly member for assembling the biasing unit and the spring receiving member, wherein the biasing unit holds the pair of springs and is disposed at the center of the cylindrical portion. A cylindrical spring holding portion, and the spool penetrates the plate portion and is connected to the spring holding portion in the reciprocating direction. The assembly member has a projecting part that is inserted into the spring holding part, and a sandwiching part that sandwiches the spring holding part between the projecting part and the projecting part. It is connected to the part.

  According to the present invention as described above, since the assembly member has the inserted portion, the assembly member, the urging unit, and the spring receiving member can be appropriately temporarily assembled and then assembled with the spool. If the inserted part is inserted into both the spring holding part and the plate part during temporary assembly, the centers of the plate part and the spring holding part can be aligned with each other, and the spring can be easily locked in the groove part. It is possible to suppress the unlocking due to the positional deviation from the cylindrical portion.

  According to the spring receiving member and the valve assembly of the present invention as described above, independent through-holes are formed at positions sandwiching the groove portion in the cylindrical portion, so that the spring can be variously sized while improving the strength. can do.

It is sectional drawing which shows the pump main body of the diaphragm pump which concerns on embodiment of this invention. It is sectional drawing which shows the switching apparatus of the said diaphragm pump. It is sectional drawing which shows the valve assembly of the said switching apparatus. It is a disassembled perspective view which shows the said valve assembly. It is a perspective view which shows the spring receiving member of the said valve assembly. It is a perspective view which shows the said spring receiving member. It is a side view which shows the said spring receiving member.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the diaphragm pump according to the present embodiment includes a pump body 200 and a switching device 300, and uses a gas such as air as a working fluid and discharges a fluid such as a liquid.

  The pump body 200 includes a pair of pump portions 200A and 200B and a center rod 201. The pair of pump parts 200 </ b> A and 200 </ b> B is formed symmetrically with each other, and includes a diaphragm body 202 fixed to the center rod 201, an inlet-side check valve 203, an outlet-side check valve 204, and a detector 205. .

  The diaphragm body 202 is fixed to the center rod 201 by being sandwiched between the disks 206 and 207, and the space between the casing 208 and the main body portion 209 through which the center rod 201 penetrates the pump chamber A1 and the working fluid. Comparting into room A2. When the center rod 201 moves in the axial direction thereof, the diaphragm body 202 also moves. When the pump chamber A1 expands in one pump portion 200A (the working fluid chamber A2 contracts), the pump chamber in the other pump portion 200B. A1 contracts (working fluid chamber A2 expands). Further, when the pump chamber A1 contracts in the one pump portion 200A, the pump chamber A1 expands in the other pump portion 200B.

  When the pump chamber A1 is expanded and depressurized, the inlet-side check valve 203 is opened and fluid is introduced from the inlet-side opening 210 into the pump chamber A1. On the other hand, when the pump chamber A1 contracts and the pressure is increased, the outlet side check valve 204 opens and the fluid in the pump chamber A1 is discharged to the outside from the outlet side opening 211. At this time, the detector 205 extends from the main body 209 toward the diaphragm body 202 in the working fluid chamber A2, and comes into contact with the disk 206 when the pump chamber A1 expands.

  As will be described later, the working fluid is alternately supplied to the respective working fluid chambers A2 of the pump units 200A and 200B by the switching device 300, whereby the center rod 201 reciprocates and the pump chambers A1 of the pump units 200A and 200B are moved. Repeat expansion and contraction alternately. Thereby, the fluid introduced from the inlet side opening 210 is discharged | emitted from the outlet side opening 211, and a fluid is supplied outside.

  As shown in FIG. 2, the switching device 300 includes a valve assembly 1 and a cylindrical housing 301 having an assembly housing chamber 300 </ b> A for housing the valve assembly 1. The casing 301 has a working fluid supply port 302, a working fluid discharge port 303, a first communication port 304 communicating with the working fluid chamber A2 of one pump unit 200A, and a working fluid chamber A2 of the other pump unit 200B. A second communication port 305 communicating with the second communication port 305 is formed.

  The spool 2 of the valve assembly 1 allows the working fluid supply port 302 to communicate with one of the communication ports 304 and 305 and allows the other of the communication ports 304 and 305 to communicate with the working fluid discharge port 303. That is, the working fluid is supplied to the working fluid chamber A2 communicated with the working fluid supply port 302 and expands, and the working fluid is discharged from the working fluid chamber A2 communicated with the working fluid discharge port 303 and contracts.

  As described above, when the pump chamber A1 expands (the working fluid chamber A2 contracts) and the disk 206 comes into contact with the detector 205, the working fluid chamber A2 in which the detector 205 is provided and the spool in the assembly storage chamber 300A. 2 communicates with one of the switching chambers 306 and 307 formed on both sides. The contracting working fluid chamber A2 is connected to the working fluid discharge port 303, and has a lower pressure than that when expanding. Therefore, the switching chamber communicated with the contracting working fluid chamber A2 has a lower pressure than the other switching chamber, and the spool 2 moves toward the switching chamber having a lower pressure. As a result, the communication ports 304 and 305 communicating with the working fluid supply port 302 or the working fluid discharge port 303 are switched, and the working fluid is supplied to the working fluid chamber A2 that has contracted until then.

  The above operation will be described with a specific example. When the spool 2 is located at the first position, the working fluid supply port 302 and the second communication port 305 communicate with each other, and the working fluid discharge port 303 and the first communication port 304 communicate with each other, the working fluid chamber in the other pump unit 200B. The working fluid is supplied to A2, and the working fluid in the working fluid chamber A2 in one pump unit 200A is discharged. That is, the center rod 2 moves toward the other pump part 200B side. When the center rod 201 moves by a predetermined distance, the disk 206 comes into contact with the detector 205 in one pump part 200A.

  As a result, the working fluid chamber A2 and the switching chamber 306 of the one pump unit 200A communicate with each other, and the switching chamber 306 has a lower pressure than the switching chamber 307. Due to this pressure difference, the spool 2 moves toward the switching chamber 306 and is positioned at the second position. The working fluid supply port 302 and the first communication port 304 communicate with each other, and the working fluid discharge port 303 and the second communication port 305 communicate with each other. Will communicate. As described above, the switching device 300 switches the working fluid chamber A2 that supplies the working fluid by moving the spool 2 due to a pressure difference when one of the pair of working fluid chambers A2 communicates with the switching chamber.

  As shown in FIGS. 3 and 4, the valve assembly 1 includes a spool 2, an urging unit 3, a spring receiving member 4, and an assembly member 5. Hereinafter, the reciprocating direction of the spool 2 is defined as the X direction, and the two directions orthogonal to the X direction are defined as the Y direction and the Z direction, respectively.

  The spool 2 is formed in a cylindrical shape as a whole by a metal member such as stainless steel, for example, and has three large diameter portions 21 to 23 and small diameter portions 24 and 25 formed between the large diameter portions 21 to 23, And a protruding portion 26 protruding from the end surface of the large-diameter portion 23.

  A packing is provided on the outer periphery of the large diameter portions 21 to 23 so that the packing is in sliding contact with the inner peripheral surface of the assembly housing chamber 300A. The large diameter portions 21 and 23 at both ends close one of the two ports that allow the assembly accommodating chamber 300A and the working fluid supply port 302 to communicate with each other, and open the other port. As a result, the working fluid supplied from the working fluid supply port 302 passes through the assembly housing chamber 300A and is supplied from either one of the communication ports 304 and 305 to the working fluid chamber A2.

  Further, the large diameter portions 21 to 23 divide the space formed by the small diameter portions 24 and 25 between them from the surroundings, so that either one of the working fluid discharge port 303 and the communication ports 304 and 305, To communicate.

  The projecting portion 26 extends along the X direction, and has a screw hole formed at the tip end surface thereof, so that the projecting portion 26 is screwed into the assembly member 5.

  The urging unit 3 includes a cylindrical spring holding portion 31 and a pair of springs 32. The spring 32 is formed in a C shape so as to be along a YZ plane that is an intersecting surface with the reciprocating direction of the spool 2, and both end portions of the C shape are held by the spring holding portion 31. In addition, the spring may be formed in an annular shape by continuing both end portions. The spring 32 is held by a spring holding portion 31 around a swing axis along the Y direction, and swings so that an inclination angle with respect to the YZ plane changes.

  The pair of springs 32 are disposed so as to face each other in the Z direction. The spring 32 has a shape in which a part of an ellipse whose longitudinal direction is the Y direction is cut out, and a restoring force is generated by being compressed in the Z direction when swinging, so that the spool 2 is urged. It is configured.

  As shown in FIGS. 5 to 7, the spring receiving member 4 is made of, for example, a resin member, and integrally includes a disk-shaped plate portion 41 and a cylindrical tube portion 42, and the whole is a bottomed cylinder. It is formed in a shape.

  The plate part 41 extends along the YZ plane and has a through hole 411 in the center part and is formed in an annular shape. For example, a rubber cushioning member 6 is sandwiched between the plate portion 41 and the spool 2.

  The cylinder portion 42 extends continuously from the outer peripheral edge of the plate portion 41 with the X direction as the axial direction. A stepped portion 421 is formed on the outer peripheral surface of the cylindrical portion 42 so that the diameter of the spool 2 is reduced. A pair of groove portions 422 and 423 extending along the circumferential direction are formed on the inner surface of the cylindrical portion 42 at positions facing each other in the Z direction (radial direction). In the present embodiment, the bottoms of the groove portions 422 and 423 extend linearly along the Y direction, but the groove portions only need to have a shape corresponding to the spring along the circumferential direction. The groove portions 422 and 423 are formed in a V shape when viewed from the Y direction, and the cylindrical portion 42 is thin at this portion. The distance between the bottoms of the pair of groove portions 422 and 423 (interval in the Z direction) is substantially constant.

  The cylinder part 42 protrudes to the inner surface side so as to be thick on both sides in the X direction of the groove parts 422 and 423. Thereby, the groove depth of the groove parts 422 and 423 is ensured.

  A pair of through holes 424 and 425 are formed at positions where the groove portion 422 is sandwiched from the circumferential direction in the cylindrical portion 42, and a pair of through holes 426 and 427 are formed at positions where the groove portion 423 is sandwiched from the circumferential direction. The through holes 424 to 427 are independent (that is, not continuous with each other), and a total of four through holes are formed in the cylindrical portion 42. That is, a column portion 428 extending along the X direction is formed between the through hole 424 and the through hole 427, and a column portion 429 extending along the X direction is formed between the through hole 425 and the through hole 426. Has been. Note that stepped portions 421 are also formed on the outer peripheral surfaces of the column portions 428 and 429.

  The entire through holes 424 to 427 are formed in a rectangular shape, and the sides adjacent to the groove portions 422 and 423 correspond to the shape of the groove portions 422 and 423 and have V-shaped portions toward the outside. Yes.

  The assembling member 5 is for assembling the urging unit 3 and the spring receiving member 4 to the spool 2, and is composed of an appropriate metal member such as stainless steel or aluminum and extends in a bar shape extending along the X direction. Is formed. The assembly member 5 includes, in order from the spool 2 side, a threaded portion 51 that is screwed into the protruding portion 26, a inserted portion 52 that is inserted into the through hole 311 of the spring holding portion 31, and the spring holding portion 31. And a sandwiching portion 53 sandwiched between the two.

  Here, the dimension, positional relationship, and operation of each part of the valve assembly 1 will be described. The outer diameter of the insertion part 52 is slightly smaller than the inner diameter of the through hole 311, and the outer diameters of the protruding part 26 and the clamping part 53 are larger than the inner diameter of the through hole 311. Further, when the assembly member 5 is completely screwed into the protruding portion 26, the distance between the protruding portion 26 and the sandwiching portion 53 is larger than the height (X-direction dimension) of the spring holding portion 31. Therefore, the spring holding part 31 through which the insertion part 52 is inserted can reciprocate along the X direction between the protruding part 26 and the clamping part 53.

  Both ends of the spring 32 in the Y direction are located in the through holes 424 to 427, respectively. That is, the spring 32 has a dimension that interferes with the cylindrical portion when the through holes 424 to 427 are not formed in the cylindrical portion.

  The spool 2 reciprocates along the X direction between the first position and the second position. When the spool 2 is located at the second position, the spool 2 and the spring receiving member 4 are closest to each other and sandwich the buffer member 6. As a result, movement of the spool 2 to one side (that is, movement to exceed the second position) is restricted by the plate portion 41. At this time, the spring 32 is inclined so as to approach the spool 2 toward the outer side in the Z direction from the spring holding portion 31, and urges the spool 2 to approach the spring receiving member 4. That is, the urging unit 3 tries to move away from the spool 2, and the spring holding portion 31 comes into contact with the clamping portion 53 of the assembly member 5 and the movement is restricted. When the spool 2 moves from the first position to the second position, the spool 2 collides with the spring receiving member 4 via the buffer member 6, and an impact is applied to the spring receiving member 4 every time the spool 2 reciprocates.

  When the spool 2 is located at the first position, the spool 2 and the spring receiving member 4 are farthest apart. At this time, the spring 32 tilts away from the spool 2 as it goes outward from the spring holding portion 31 in the Z direction, and generates a biasing force in a direction that separates the spool 2 and the spring receiving member 4. That is, the urging unit 3 tries to move closer to the spool 2.

  The position of the spool 2 when the C-shaped spring 32 is substantially parallel to the YZ plane is defined as a neutral position in the X direction. At this time, the spring 32 generates an urging force in a direction toward the outside in the Z direction. When the spool 2 is displaced from the neutral position and the spring 32 is inclined with respect to the YZ plane, the spring 32 biases the spool 2 further away from the neutral position. Further, when the spool 2 is positioned at the neutral position, the spring 32 is most compressed and the urging force is maximized. Therefore, if the force to move the spool 2 to one side is smaller than the maximum urging force, the spool 2 If it returns to the position and is larger than the maximum biasing force, it is further biased after exceeding the neutral position, and the spool 2 moves to one side. Thereby, the stop in the neutral position of the spool 2 is suppressed.

  According to this embodiment, there are the following effects. In other words, the spring receiving member 4 includes the cylindrical portion 42 that extends in the X direction, which is the reciprocating direction of the spool 2, so that the strength of the spring receiving member 4 is ensured at a position where the groove portions 422 and 423 are not formed. be able to. In addition, since the through holes 424 to 427 are formed at positions where the groove portions 422 and 423 are sandwiched in the cylindrical portion 42, a part of the spring 32 can be disposed or penetrated in the through holes 424 to 427. Large springs can be used. At this time, the through holes 424 to 427 are independent of each other, and the column portions 428 and 429 are formed therebetween, so that the strength of the cylindrical portion 42 is not easily lowered even if the through holes are formed.

  Further, since the assembly member 5 has the inserted portion 52, the assembly member 5, the urging unit 3, and the spring receiving member 4 can be temporarily assembled together and then the spool 2 can be assembled. If the inserted portion 52 is inserted into both the spring holding portion 31 and the plate portion 41 during temporary assembly, the centers of the plate portion 41 and the spring holding portion 31 can be aligned with each other, and the spring 32 is attached to the groove portions 422 and 423. It is easy to lock, and it is possible to prevent the lock from being released due to the displacement between the spring holding portion 31 and the cylindrical portion 42.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and includes other configurations that can achieve the object of the present invention. Are also included in the present invention.

  For example, in the above-described embodiment, a part of the spring 32 is located in the through holes 424 to 427, but a spring having a dimension that penetrates the through holes 424 to 427 may be used. Moreover, the width (circumferential dimension) of the through hole only needs to be set according to the size of the spring that is expected to be used. A larger spring can be used if the width is large, and a strength is improved if the width is small. Can be made.

  Moreover, in the said embodiment, although the plate part 41 shall be disk shape and the cylinder part 42 shall be cylindrical shape, a plate part and a cylinder part should just be an appropriate shape corresponding to each other, and a plate part is elliptical shape. And the cylindrical portion may be an elliptical cylindrical shape, the plate portion may be a polygonal shape and the cylindrical portion may be a polygonal cylindrical shape.

  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.

DESCRIPTION OF SYMBOLS 1 Valve assembly 2 Spool 26 Protrusion part 3 Energizing unit 31 Spring holding part 32 Spring 4 Spring receiving member 41 Plate part 42 Cylinder part 422, 423 Groove part 424-427 Through-hole 5 Assembly member 52 Insertion part 53 Holding part

Claims (2)

A spool that switches the flow path of the working fluid by reciprocating between the first position and the second position and an annular or C-shape along the intersecting surface of the reciprocating direction of the spool and the aforementioned A biasing unit having a pair of springs for biasing the spool away from the neutral position in the reciprocating direction, and a spring receiving member provided in a valve assembly comprising:
A plate portion for restricting movement of the spool to one side;
A cylindrical portion that extends continuously from the outer peripheral edge of the plate portion with the reciprocating direction as an axial direction and accommodates the urging unit;
On the inner surface of the cylindrical portion, a pair of grooves that extend along the circumferential direction and engage the spring are formed at positions facing each other,
A spring receiving member, wherein the cylindrical portion has a pair of independent through holes at positions sandwiching the pair of grooves from the circumferential direction. A spool that switches the flow path of the working fluid by reciprocating between the first position and the second position and an annular or C-shape along the intersecting surface of the reciprocating direction of the spool and the aforementioned An urging unit having a pair of springs for urging the spool away from the neutral position in the reciprocating direction, the spring receiving member according to claim 1, and the urging unit and the spring receiving unit with respect to the spool. An assembly member for assembling the member, and a valve assembly comprising:
The urging unit has a cylindrical spring holding portion that holds the pair of springs and is arranged at the center of the cylindrical portion,
The spool has a protruding portion that penetrates the plate portion and can contact the spring holding portion in the reciprocating direction.
The assembly member is connected to the projecting part by having a inserted part inserted into the spring retaining part and a sandwiching part for sandwiching the spring retaining part between the projecting part and the projecting part. Valve assembly.

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