JP6770748B2 - Spring receiving member and valve assembly - Google Patents

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.

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

Japanese Unexamined Patent Publication No. 2014-214629

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

Therefore, it is conceivable to use a spring receiving member having a tubular rising portion (cylinder portion) and to form a groove for locking the spring on the inner surface of the tubular portion. In such a configuration, the strength can be ensured by the portion of the cylinder portion where the groove is not formed, but the entire spring must be housed inside the cylinder portion, and the spring needs to be miniaturized. .. If the degree of freedom in designing the spring is low, the degree of freedom in setting the urging force in the neutral position and the reciprocating movement distance (stroke length) of the spool is reduced. As described above, it has been difficult to improve the strength of the spring receiving member and the degree of freedom in designing the spring at the same time.

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

The spring receiving member of the present invention is annular or C along the intersection 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. A spring receiving member provided in a valve assembly comprising a pair of springs that are formed in a shape and urge the spool away from a neutral position in the reciprocating direction. A plate portion that restricts movement to one side and a cylinder portion that continuously extends from the outer peripheral edge of the plate portion with the reciprocating direction as an axial direction and accommodates the urging unit are provided. A pair of groove portions extending along the circumferential direction to lock the spring are formed on the inner surface at positions facing each other, and the tubular portion is independently positioned at a position sandwiching the pair of groove portions from the circumferential direction. It is characterized in that a pair of through holes are formed.

According to the present invention as described above, by having the tubular portion extending in the reciprocating direction of the spool as the axial direction, the strength of the spring receiving member can be ensured at the position where the groove portion is not formed. Further, since the through hole is formed at the position of sandwiching the groove portion in the tubular portion, a part of the spring can be arranged or penetrated in the through hole, and a large-sized spring can be used. At this time, the through holes are independent of each other (that is, the through hole formed next to one groove portion and the through hole formed next to the other groove portion are not continuous, and a total of four through holes are formed. Since it is formed), a pillar portion is formed between the through holes, and even if the through holes are formed, the strength of the spring receiving member is unlikely to decrease.

On the other hand, the valve assembly of the present invention is annular or annularly along the intersection 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. With respect to the urging unit having a pair of springs formed in a C shape and urging the spool away from the neutral position in the reciprocating direction, the spring receiving member according to claim 1, and the spool. A valve assembly comprising the urging unit and an assembling member for assembling the spring receiving member, wherein the urging unit holds the pair of springs and is arranged in the center of the tubular portion. The spool has a tubular spring holding portion, the spool has a protruding portion that penetrates the plate portion and can come into contact with the spring holding portion in the reciprocating direction, and the assembly member is attached to the spring holding portion. It is characterized in that it has a sandwiched portion for sandwiching the spring holding portion between the inserted portion to be inserted and the protruding portion, and is connected to the protruding portion.

According to the present invention as described above, since the assembling member has the insertion portion, the assembling member, the urging unit, and the spring receiving member can be temporarily assembled as appropriate, and then these and the spool can be assembled. At the time of temporary assembly, if the inserted portion is inserted through both the spring holding portion and the plate portion, the centers of the plate portion and the spring holding portion can be aligned with each other, and the spring can be easily locked in the groove portion. It is possible to prevent the lock from being released due to the misalignment with the cylinder portion.

According to the spring receiving member and valve assembly of the present invention as described above, independent through holes are formed at positions of the tubular portion sandwiching the groove portion, so that the springs of various sizes can be supported 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 device of the diaphragm pump. It is sectional drawing which shows the valve assembly of the switching device. It is an exploded perspective view which shows the valve assembly. It is a perspective view which shows the spring receiving member of the valve assembly. It is a perspective view which shows the spring receiving member. It is a side view which shows the 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 of the present embodiment includes a pump main body 200 and a switching device 300, 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 units 200A and 200B and a center rod 201. The pair of pump portions 200A and 200B are formed symmetrically with each other and include 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 by the discs 206 and 207, and the space between the housing 208 and the main body portion 209 through which the center rod 201 penetrates is formed between the pump chamber A1 and the working fluid. It is divided into room A2. When the center rod 201 moves in the axial direction, the diaphragm body 202 also moves, and when the pump chamber A1 expands in one pump unit 200A (the working fluid chamber A2 contracts), the pump chamber in the other pump unit 200B. A1 contracts (the working fluid chamber A2 expands). Further, when the pump chamber A1 contracts in one pump unit 200A, the pump chamber A1 expands in the other pump unit 200B.

When the pump chamber A1 expands and is depressurized, the inlet side check valve 203 opens and the fluid is introduced into the pump chamber A1 from the inlet side opening 210. On the other hand, when the pump chamber A1 contracts and is boosted, 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 disc 206 when the pump chamber A1 expands.

As will be described later, the switching device 300 alternately supplies the working fluid to the working fluid chambers A2 of the pumps 200A and 200B, so that the center rod 201 reciprocates and the pump chambers A1 of the pumps 200A and 200B move back and forth. The expansion and contraction are repeated alternately. As a result, the fluid introduced from the inlet side opening 210 is discharged from the outlet side opening 211, and the fluid is supplied to the outside.

As shown in FIG. 2, the switching device 300 includes a valve assembly 1 and a tubular housing 301 having an assembly storage chamber 300A for accommodating the valve assembly 1. The housing 301 includes 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 part 200A, and a working fluid chamber A2 of the other pump part 200B. A second communication port 305 and a second communication port 305 are formed.

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

When the pump chamber A1 expands (the working fluid chamber A2 contracts) and the disk 206 comes into contact with the detector 205 as described above, the working fluid chamber A2 provided with the detector 205 and the spool in the assembly accommodating chamber 300A. One of the switching chambers 306 and 307 formed on both sides of No. 2 communicates with each other. The contracting working fluid chamber A2 is connected to the working fluid discharge port 303, and the pressure is lower than that when expanding. Therefore, the switching chamber communicating with the contracting working fluid chamber A2 has a lower pressure than the other switching chamber, and the spool 2 moves toward the low-pressure switching chamber side. As a result, the communication ports 304 and 305 that communicate 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 been 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 portion 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 portion 200B side. When the center rod 201 moves by a predetermined distance, the disk 206 comes into contact with the detector 205 in one of the pump units 200A.

As a result, the working fluid chamber A2 and the switching chamber 306 of one of the pump units 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. Will communicate. As described above, the switching device 300 switches the working fluid chamber A2 for supplying the working fluid by moving the spool 2 by the pressure difference by communicating the one of the pair of working fluid chambers A2 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 assembling member 5. In the following, the reciprocating direction of the spool 2 is the X direction, and the two directions orthogonal to the X direction are the Y direction and the Z direction, respectively.

The spool 2 has a columnar shape as a whole made of a metal member such as stainless steel, 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, respectively. A protruding portion 26 projecting from the end surface of the large diameter portion 23 is provided.

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 accommodating chamber 300A. The large diameter portions 21 and 23 at both ends block one of the two ports that communicate the assembly accommodating chamber 300A and the working fluid supply port 302, and open the other port. As a result, the working fluid supplied from the working fluid supply port 302 passes through the assembly accommodating chamber 300A and is supplied to the working fluid chamber A2 from either the communication ports 304 or 305.

Further, the large diameter portions 21 to 23 are provided with the working fluid discharge port 303 and one of the communication ports 304 and 305 by partitioning the space formed by the small diameter portions 24 and 25 between them from the surroundings. Communicate.

The protruding portion 26 extends along the X direction and has a screw hole formed on its tip surface so as to be screwed with the assembling member 5.

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

The pair of springs 32 are arranged so as to face each other in the Z direction. The spring 32 has a shape in which a part of an oval having the Y direction as the longitudinal direction is cut out, and a restoring force is generated by being compressed in the Z direction during swinging so as to urge the spool 2. It is configured in.

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

The plate portion 41 extends along the YZ plane and has a through hole 411 in the central portion to form an annular shape. The plate portion 41 sandwiches, for example, a rubber cushioning member 6 between the plate portion 41 and the spool 2.

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

The tubular portion 42 projects inwardly so as to have a wall thickness on both sides of the groove portions 422 and 423 in the X direction. As a result, the groove depth of the groove portions 422 and 423 is secured.

A pair of through holes 424 and 425 are formed at positions of the tubular portion 42 sandwiching the groove portion 422 from the circumferential direction, and a pair of through holes 426 and 427 are formed at positions sandwiching the groove portion 423 from the circumferential direction. The through holes 424 to 427 are independent of each other (that is, they are not continuous with each other), and a total of four through holes are formed in the tubular portion 42. That is, a pillar portion 428 extending in the X direction is formed between the through hole 424 and the through hole 427, and a pillar portion 429 extending in the X direction is formed between the through hole 425 and the through hole 426. Has been done. A step portion 421 is also formed on the outer peripheral surface of the pillar portions 428 and 429.

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

The assembling member 5 is for assembling the urging unit 3 and the spring receiving member 4 to the spool 2, and is formed of an appropriate metal member such as stainless steel or aluminum and has a rod shape extending in the X direction. It is formed. In the assembling member 5, in order from the spool 2 side, a screw portion 51 that is screwed into the protruding portion 26, an inserted portion 52 that is inserted into the through hole 311 of the spring holding portion 31, and a spring holding portion 31 are inserted into the protruding portion 26. It has a holding portion 53 that is sandwiched between the two.

Here, the dimensions, positional relationships, and operations of each part of the valve assembly 1 will be described. The outer diameter of the insertion portion 52 is formed to be slightly smaller than the inner diameter of the through hole 311, and the outer diameter of the protruding portion 26 and the sandwiching portion 53 is formed to be larger than the inner diameter of the through hole 311. Further, when the assembling member 5 is completely screwed into the protruding portion 26, the distance between the protruding portion 26 and the holding portion 53 is larger than the height (dimension in the X direction) of the spring holding portion 31. Therefore, the spring holding portion 31 through which the inserted portion 52 is inserted can be reciprocated along the X direction between the protruding portion 26 and the holding portion 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 size that interferes with the tubular portion when the through holes 424 to 427 are not formed in the tubular 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 cushioning member 6. As a result, the plate portion 41 regulates the movement of the spool 2 to one side (that is, the movement to cross the second position). At this time, the spring 32 is inclined so as to approach the spool 2 from the spring holding portion 31 toward the outside in the Z direction, 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 holding portion 53 of the assembling member 5 to restrict the movement. 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 cushioning member 6, and an impact is applied to the spring receiving member 4 each 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 most separated from each other. At this time, the spring 32 is inclined so as to be separated from the spool 2 from the spring holding portion 31 toward the outside in the Z direction, and an urging force is generated in the direction of separating 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 set to the neutral position in the X direction. At this time, the spring 32 generates an urging force in the direction outward in the Z direction. When the spool 2 deviates from the neutral position and the spring 32 tilts with respect to the YZ plane, the spring 32 urges the spool 2 to move further away from the neutral position. Further, when the spool 2 is in the neutral position, the spring 32 is compressed most and the urging force is maximized. Therefore, if the force for moving the spool 2 to one side is smaller than the maximum urging force, the spool 2 is the original. If it returns to the position and is larger than the maximum urging force, it is further urged after passing the neutral position, and the spool 2 moves to one side. As a result, the spool 2 is suppressed from stopping at the neutral position.

According to this embodiment, there are the following effects. That is, the spring receiving member 4 has a tubular portion 42 extending 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. Further, since the through holes 424 to 427 are formed at the positions of the tubular portion 42 sandwiching the grooves 422 and 423, a part of the spring 32 can be arranged 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 pillar portions 428 and 249 are formed between them, so that the strength of the tubular portion 42 is unlikely to decrease even if the through holes are formed.

Further, since the assembling member 5 has the inserted portion 52, the assembling member 5, the urging unit 3, and the spring receiving member 4 can be appropriately temporarily assembled, and then these and the spool 2 can be assembled. If the inserted portion 52 is inserted through both the spring holding portion 31 and the plate portion 41 at the time of 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 provided in the groove portions 422 and 423. It is easy to lock, and it is possible to prevent the spring holding portion 31 and the cylinder portion 42 from being unlocked due to a misalignment.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above-described embodiments, and includes other configurations and the like that can achieve the object of the present invention, and modifications and the like as shown below. Is also included in the present invention.

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

Further, in the above embodiment, the plate portion 41 is disk-shaped and the cylinder portion 42 is cylindrical, but the plate portion and the cylinder portion may have an appropriate shape corresponding to each other, and the plate portion may have an elliptical shape. In addition, the tubular portion may have an elliptical tubular shape, or the plate portion may have a polygonal shape and the tubular portion may have a polygonal tubular shape.

In addition, the best configuration, method, and the like for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, although the present invention is particularly illustrated and described primarily with respect to a particular embodiment, it does not deviate from the scope of the technical idea and purpose of the present invention and has a shape relative to the embodiments described above. , Materials, quantities, and other detailed configurations can be modified by those skilled in the art. Therefore, the description limiting the shapes, materials, etc. disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, those shapes, materials, etc. The description by the name of the member which removes a part or all of the limitation such as is included in the present invention.

1 Valve assembly 2 Spool 26 Protruding part 3 Biasing 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 Assembling 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 is formed in an annular shape or a C shape along the intersection with the reciprocating direction of the spool. A spring receiving member provided in a valve assembly comprising a pair of springs that urge the spool away from its neutral position in the reciprocating direction.
A plate portion that regulates the movement of the spool to one side and
The outer peripheral edge of the plate portion is provided with a tubular portion that extends continuously in the reciprocating direction as an axial direction and accommodates the urging unit.
On the inner surface of the tubular portion, a pair of groove portions extending along the circumferential direction to lock the spring are formed at positions facing each other.
A spring receiving member characterized in that a pair of independent through holes are formed in the tubular portion at positions sandwiching the pair of groove portions 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 is formed in an annular shape or a C shape along the intersection with the reciprocating direction of the spool. 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, the urging unit and the spring receiving member with respect to the spool. A valve assembly provided with an assembly member for assembling the member.
The urging unit holds the pair of springs and has a tubular spring holding portion arranged in the center of the tubular portion.
The spool has a protruding portion that penetrates the plate portion and can come into contact with the spring holding portion in the reciprocating direction.
The assembly member is characterized in that it has an inserted portion to be inserted into the spring holding portion and a holding portion for sandwiching the spring holding portion between the protruding portion and is connected to the protruding portion. Valve assembly to do.

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