JP2014021594A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve pressure adjustment accuracy of a pressure reducing valve.SOLUTION: A primary side chamber 17 in communication with a primary side port and a secondary side chamber 18 in communication with a secondary side port are formed in a valve housing 11 and are in communication with each other through a valve opening 16. The valve housing 11 is provided with a diaphragm 34 which partitions the secondary side chamber 18 and which is provided with a poppet valve 24 in the central section thereof. A liquid guiding surface 43 opposite to the diaphragm 34 is provided with a ring-like surface 44 facing outer peripheral portion of the diaphragm 34 to form a ring-like circular flow channel 45. Liquid which enters the secondary side chamber 18 through the valve opening 16 is guided along a slope toward the circular flow channel 45 to generate a circular flow in the circular flow channel 45.

Description

  The present invention relates to a pressure reducing valve for reducing the liquid flowing into a primary side port to a set pressure lower than that of the primary side and supplying the reduced pressure to the secondary side port.

  A pressure reducing valve is used to regulate the primary side fluid supplied to the primary side port to a set pressure lower than the primary side pressure and to flow out to the secondary side port. The pressure reducing valve has a primary side chamber communicating with the primary side port, a secondary side chamber communicating with the secondary side port, and a valve housing formed with a valve hole communicating with the primary side chamber and the secondary side chamber. There is a type in which a poppet valve that opens and closes a valve hole is disposed in the valve hole, and a diaphragm that partitions the secondary side chamber is provided in the valve housing. The poppet valve is energized with a spring force in the direction of closing the valve hole, and the diaphragm is energized with a spring force or a pressure adjusting force by fluid pressure in the direction of opening the valve hole with respect to the poppet valve. Thereby, even if the pressure of the primary side fluid fluctuates, the fluid of the regulated secondary side pressure can be discharged from the secondary side port. Patent Document 1 describes a pressure reducing valve as described above.

Japanese Patent No. 4694341

  As described in Patent Document 1, since the secondary port communicates with the outer peripheral portion of the secondary chamber through the communication hole, the fluid that has flowed into the secondary chamber from the valve hole passes through the secondary chamber radially outward. Will flow out to the secondary port.

  When a pressure reducing valve is used to reduce the pressure of the liquid supplied to the primary side port to flow out to the secondary side port, the bubbles previously contained in the flow path when the pressure reducing valve is started up are secondary. May remain in the side chamber. In addition, when the fluid used is changed, the fluid before the change may remain and the replacement of the liquid may not be performed satisfactorily. In order to prevent such bubbles and fluids from remaining, in the pressure reducing valve described in Patent Document 1, the communication hole in the secondary side chamber of the valve hole, that is, the communication hole on the inflow side to the secondary side chamber is arranged in the radial direction. The outflow side communication hole communicating with the secondary port is formed on the opposite side to the inflow side communication hole, that is, at a position shifted by 180 degrees in the circumferential direction.

  However, if the inflow side communication hole and the outflow side communication hole are formed in the opposite circumferential directions in this way, the liquid flowing into the secondary side chamber from the primary side chamber via the valve hole causes the poppet valve and the diaphragm to flow. In this case, the fluid pressure in the direction deviating in the radial direction is applied. For this reason, there exists a problem that the setting precision of secondary side pressure cannot be raised.

  An object of the present invention is to improve liquid replacement performance, discharge bubbles, and improve pressure regulation accuracy of a pressure reducing valve.

  The pressure reducing valve of the present invention has a primary side port communicating with the primary side chamber, a valve hole having one end opened to the primary side chamber and the other end opened to the secondary side chamber, and a communication hole in the outer peripheral portion of the secondary side chamber. A valve housing formed with a secondary side port communicating therewith, a diaphragm provided in the valve housing and defining the secondary side chamber, provided coaxially with the diaphragm and provided on the one end side of the valve hole. A poppet valve that opens and closes the valve seat, and a liquid guide surface facing the diaphragm is provided with an annular surface that opens the communication hole and faces the outer periphery of the diaphragm to form an annular swirl passage A plurality of guide grooves are formed in the liquid guide surface, and the guide grooves supply the liquid that has flowed into the secondary side chamber from the valve hole while being inclined in the circumferential direction toward the swirl flow path, The swirl flow path And forming a flow.

  In this pressure reducing valve, the liquid guide surface facing the diaphragm is provided with an annular surface having a communication hole communicating with the secondary port, and a plurality of guide grooves inside the annular surface. Since the guide groove is inclined with respect to the swirling flow path formed between the annular surface and the outer periphery of the diaphragm, the liquid flowing into the secondary side chamber from the valve hole causes the swirling flow of liquid in the swirling flow path. Is generated. Since this swirl flow causes a flow to occur throughout the secondary side chamber, the liquid replacement performance in the room is good, and the air bubbles in the room are reliably discharged to the outside along the flow.

  Furthermore, since the liquid flows radially from the valve holes guided by the plurality of guide grooves, the true angle of the poppet valve is secured to the diaphragm and poppet valve without applying a biased load in the radial direction. The pressure adjustment accuracy can be increased.

It is sectional drawing which shows a pressure-reduction valve. It is a perspective view which shows the valve storage block shown by FIG. FIG. 3 is a plan view of FIG. 2. FIG. 4 is a sectional view taken along line 4-4 in FIG. It is a top view which shows the valve storage block in the pressure reducing valve which is a modification. FIG. 6 is a sectional view taken along line 6-6 in FIG. It is a top view which shows the valve storage block in the pressure-reduction valve which is another modification. It is a top view which shows the valve storage block in the pressure reducing valve which is another modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the pressure reducing valve 10 has a resin valve housing 11. The valve housing 11 is formed by a substantially rectangular parallelepiped-shaped valve housing block 12, a first cover 13 attached to the one end face, and a second cover 14 attached to the other end face.

  The valve housing block 12 forming the valve housing 11 is provided with a stepped valve mounting hole 15 penetrating in the vertical direction in FIG. A valve hole 16 is formed by a small diameter portion which is a part of the valve mounting hole 15. A primary side chamber 17 is formed by the large diameter portion of the valve mounting hole 15, and a secondary side chamber 18 is formed on the opposite side of the primary side chamber 17. One end of the valve hole 16 opens to the primary chamber 17, and the other end of the valve hole 16 opens to the secondary chamber 18.

  A cylindrical primary joint 19 projects from the side surface of the valve housing block 12, and a cylindrical secondary joint 20 projects coaxially with the primary joint 19 on the opposite side surface. It has been. The communication hole of the primary side joint 19 is a primary side port 21 communicating with the primary side chamber 17, and the communication hole of the secondary side joint 20 is a secondary side port 22 communicating with the secondary side chamber 18. A communication hole 23 for communicating the secondary side chamber 18 and the secondary port 22 is formed in the valve housing block 12. A liquid supply passage (not shown) is connected to the primary side joint 19, and a liquid outflow passage (not shown) is connected to the secondary side joint 20. The liquid supplied to the primary port 21 is reduced in pressure and flows out from the secondary port 22 through the communication hole 23.

  A poppet valve 24 is mounted in the primary chamber 17 so as to be movable in the axial direction of the valve hole 16. The poppet valve 24 has a valve body 26, which closes the valve hole 16 in close contact with a valve seat 25 provided on one end side of the valve hole 16, that is, on the primary side chamber 17 side. The valve hole 16 is opened away from 25. The valve body 26 is formed of resin. Stems 27 and 28 are integrally provided at both axial ends of the valve body 26.

  The stem 27 is integrally provided with an elastically deformable partition membrane 30 projecting radially outward, and a fixing ring 31 is integrally provided on the outer periphery of the partition membrane 30. When the poppet valve 24 is mounted in the primary side chamber 17, the primary side chamber 17 is partitioned between the partition membrane 30 and the valve seat 25. A spring receiver 32 is attached to the stem 27, and a compression coil is provided between the spring receiver 32 and the cover 13 as a spring member for biasing the poppet valve 24 in the direction toward the valve seat 25. A spring 33 is mounted.

  A resin diaphragm 34 is mounted between the valve housing block 12 and the cover 14 attached thereto, and a secondary side chamber 18 is defined between the diaphragm 34 and the end surface of the valve housing block 12. Yes. The diaphragm 34 has a thick disk 35, and an elastically deformable partition film 36 that protrudes radially outward is integrally provided on the disk 35, and a fixing ring 37 is partitioned on the outer periphery of the partition film 36. The fixing ring 37 is provided integrally with the membrane 36 and is sandwiched between the valve housing block 12 and the cover 14. A stem 28 of the poppet valve 24 is abutted against the central portion of the disk 35, and the poppet valve 24 is provided coaxially with the diaphragm 34. The tip of the stem 28 of the poppet valve 24 has a hemispherical shape, and the disc 35 of the diaphragm 34 has a hemispherical concave surface 38 into which the tip of the stem 28 enters. The poppet valve 24 shown in FIG. 1 is provided on the concave surface 38 of the diaphragm 34, but the poppet valve 24 and the diaphragm 34 may be integrally formed.

  A pressure regulating chamber 39 is formed on the inner surface of the cover 14, and the pressure regulating chamber 39 is partitioned by the diaphragm 34 and the cover 14. The cover 14 is provided with a pressure adjusting port 40 that supplies a fluid such as compressed air to the pressure adjusting chamber 39. The fluid is supplied to the pressure adjusting chamber 39 by a pipe connected to the pressure adjusting port 40, and the diaphragm The fluid pressure in the direction in which the poppet valve 24 moves away from the valve seat 25 is applied to the poppet valve 24 via 34.

  A spring force in the direction toward the valve seat 25 is applied to the poppet valve 24 by the compression coil spring 33, while an urging force in a direction away from the valve seat 25 is applied by the diaphragm 34 to which the fluid pressure in the pressure regulating chamber 39 is applied. By adjusting the fluid pressure supplied to the pressure regulating chamber 39, the pressure of the liquid flowing out from the secondary side port 22 is set. When the pressure of the liquid flowing out from the secondary port 22 becomes lower than the set pressure, the thrust applied to the diaphragm 34 by the fluid in the pressure regulating chamber 39, that is, the thrust in the direction separating the poppet valve 24 from the valve seat 25, The spring force applied by the spring 33, that is, the spring force pressing the poppet valve 24 toward the valve seat 25 becomes larger. Accordingly, the poppet valve 24 is separated from the valve seat 25, so that the valve hole 16 is opened and the liquid supplied to the primary side port 21 flows out to the secondary side port 22. On the other hand, when the pressure of the secondary port 22 increases, the diaphragm 34 and the poppet valve 24 are displaced in the direction toward the valve seat 25 by the spring force of the compression coil spring 33, and the valve hole 16 is closed by the poppet valve 24. Thereby, the pressure of the liquid flowing out from the secondary side port 22 is set to a constant secondary side pressure by the fluid pressure for pressure regulation supplied to the pressure regulation chamber 39. The secondary pressure is regulated to the set pressure even when the primary pressure supplied to the primary port 21 fluctuates or the flow rate fluctuates, and the regulated liquid is shown from the secondary port. To be supplied toward the supplied member.

  2 is a perspective view showing the valve housing block 12 of the valve housing 11 shown in FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a sectional view taken along line 4-4 in FIG. 2 and 3 show the upper end surface of the valve housing block 12 in FIG.

  An annular groove 41 into which the annular rib 37 a of the fixing ring 37 of the diaphragm 34 enters is formed in the valve housing block 12, and an annular protrusion 42 that sandwiches the fixing ring 37 between the annular groove 41 and the cover 14. Is provided. The inner side of the annular protrusion 42 in the radial direction is a liquid guide surface 43 that faces the inner surface of the diaphragm 34. The liquid guide surface 43 faces the disk 35 and the partition film 36 of the diaphragm 34, and the liquid guide surface 43. A valve hole 16 is opened at the center of the valve.

  An annular surface 44 is formed on the outer peripheral portion of the liquid guide surface 43, the communication hole 23 opens to the annular surface 44, the communication hole 23 extends in the circumferential direction, and the opening surface has an arc shape. A swirl passage 45 is formed between the annular surface 44 and the outer peripheral portion of the diaphragm 34 opposed to the annular surface 44. A portion of the liquid guide surface 43 that is radially inward of the annular surface 44 protrudes toward the diaphragm 34 as shown in FIG. 4. As shown in FIG. 4, the poppet valve 24 is connected to the valve seat 25. A slight gap is formed between the inner surface of the diaphragm 34 and the inner surface of the diaphragm 34. Thus, when the poppet valve 24 is separated from the valve seat 25 and the valve hole 16 is opened, the liquid flows through the secondary side chamber 18 formed between the entire surface of the liquid guide surface 43 and the diaphragm 34, and the secondary side The liquid flows toward the port 22.

  The liquid guide surface 43 is provided with four guide grooves 46 that guide the liquid from the valve hole 16 toward the swirl passage 45 at a predetermined interval in the circumferential direction. Each guide groove 46 is defined by a bottom surface 47 and side surfaces 48 and 49 facing each other. As shown in FIG. 3, each guide groove 46 extends straight from the central portion toward the outer peripheral portion and Inclined with respect to the radial line R. The liquid flowing radially outward in the guide groove 46 flows into the swirl passage 45 while being inclined in the circumferential direction. Since the four guide grooves are similarly inclined, a swirling flow of the liquid flowing in the circumferential direction is generated in the swirling flow path 45.

  The total area of the cross-sectional areas of the four guide grooves 46 is set to an area substantially corresponding to the cross-sectional area of the communication hole 23. When the poppet valve 24 opens the valve hole 16, most of the liquid flowing into the secondary side chamber 18 from the valve hole 16 is guided by the guide groove 46 and flows toward the swirling channel 45. A swirling flow is generated. The other part of the liquid enters the gap between the liquid guide surface 43 and the diaphragm 34, and the entered liquid is sucked into the swirling flow and flows toward the swirling channel 45. Since the guide groove 46 is inclined with respect to the annular surface 44, the liquid circulates and flows through the entire swirl passage 45. Therefore, even when bubbles or foreign matters remain in the secondary side chamber 18 when the pressure reducing valve 10 is started, that is, when the pressure reducing valve 10 is started up, the swirling flow of the liquid formed in the swirling flow path 45 and the suction flow are sucked by this. Due to the liquid flow flowing through the gap, bubbles and foreign substances flow out to the secondary side port 22 together with the fluid, so that bubbles and foreign substances are prevented from remaining in the secondary side chamber 18. The liquid that has flowed into the swirl passage 45 is directed to the communication hole 23 and discharged from the secondary port 22 to the outside.

  Moreover, the liquid that has flowed into the secondary chamber 18 from the valve hole 16 flows through the plurality of guide grooves 46 and also flows radially along the entire surface of the diaphragm 34 and the liquid guide surface 43. Accordingly, the liquid flowing in the secondary side chamber 18 does not apply the hydraulic pressure in the direction in which the poppet valve 24 and the diaphragm 34 are displaced in the radial direction, and the central axis of the poppet valve 24 during the opening / closing operation is relative to the diaphragm 34. The right angle state, that is, the straightness is maintained. When the straightness of the poppet valve 24 is maintained, the poppet valve 24 vertically contacts the valve seat 25 to close the valve hole 16. Compared to the case where the position is not vertical, the secondary pressure of the poppet valve 24 can be adjusted with high accuracy.

  FIG. 5 is a plan view showing a valve housing block 12 in a pressure reducing valve 10 which is a modified example, and FIG. 6 is a sectional view taken along line 6-6 in FIG.

  The side surfaces 48 and 49 of the four guide grooves 46 formed on the liquid guide surface 43 shown in FIG. 5 are curved from the central portion toward the outer peripheral portion, and the distance between the side surfaces 48 and 49 is the central portion. Widens from the side toward the outer peripheral side. As described above, since the side surfaces 48 and 49 of the respective guide grooves 46 are curved, the liquid guided by the guide grooves 46 flows into the swirl flow path 45 with a greater inclination than that described above. Thereby, the swirl flow generated in the swirl flow path 45 by the liquid guided by the guide groove 46 can be made faster.

  As shown in FIG. 6, the bottom surface 47 of each guide groove 46 is inclined in a direction approaching the diaphragm 34 from the central portion toward the outer peripheral portion, and the depth of the guide groove 46 is from the central portion to the outer peripheral portion. It is getting shallower towards. As described above, the distance between the side surfaces of the guide grooves 46 is set wide toward the outer peripheral portion, whereas by reducing the depth of the guide grooves 46 toward the outer peripheral portion, The cross-sectional area is substantially the same from the center to the outer periphery.

  FIGS. 7 and 8 are plan views showing a valve housing block 12 in a pressure reducing valve 10 which is a modification.

  The pressure reducing valve 10 shown in FIG. 7 has four guide grooves 46 as in the case described above, whereas the pressure reducing valve 10 shown in FIG. 8 has three guide grooves 46. Each guide groove 46 has an inner portion 46a that extends in a circumferential direction with respect to the radial line R from the central portion and extends straight, and further, from the radially outer end of the inner portion 46a to the inner portion 46a. And an outer portion 46b bent in the circumferential direction. Thus, if it inclines in two steps, the inclination-angle of the circumferential direction of the outer peripheral part of the guide groove 46 and the turning flow path 45 can be enlarged. Thereby, the swirl flow generated in the swirl flow path 45 by the liquid guided by the guide groove 46 can be made faster. As shown in FIGS. 5 to 8, when the inflow angle of the liquid flowing into the swirl passage 45 from the guide groove 46 is increased, bubbles and foreign matters remaining in the secondary side chamber 18 can be quickly discharged.

  5 to 8, members that are the same as those shown in FIGS. 1 to 4 are given the same reference numerals.

  In the pressure reducing valve 10 described above, fluid pressure is applied to the pressure adjusting chamber 39 in order to apply pressure adjusting thrust to the diaphragm 34. However, if a pressure adjusting spring member is provided on the cover 14, the spring force is adjusted. Thus, the pressure reducing valve is configured to set the hydraulic pressure on the secondary side.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, although the poppet valve 24 and the diaphragm 34 described above are separate members, they may be integrally formed.

10 Pressure reducing valve 11 Valve housing 12 Valve housing block 13, 14 Cover 16 Valve hole 17 Primary side chamber 18 Secondary side chamber 21 Primary side port 22 Secondary side port 23 Communication hole 24 Poppet valve 25 Valve seat 26 Valve body 27, 28 Stem 30 Partition membrane 33 Compression coil spring 34 Diaphragm 35 Disc 36 Partition membrane 39 Pressure regulating chamber 40 Pressure regulating port 41 Annular groove 42 Annular projection 43 Liquid guide surface 44 Annular surface 45 Swivel channel 46 Guide groove 46a Inner portion 46b Outer portion 47 Bottom surface 48 49 sides

Claims (7)

A primary side port communicating with the primary side chamber, a valve hole having one end opened to the primary side chamber and the other end opened to the secondary side chamber, and a secondary side communicating with the outer peripheral portion of the secondary side chamber via the communication hole A valve housing formed with a port;
A diaphragm provided in the valve housing and defining the secondary side chamber;
A poppet valve that is coaxially provided on the diaphragm and opens and closes a valve seat provided on the one end side of the valve hole;
The liquid guide surface facing the diaphragm is provided with an annular surface that opens the communication hole and faces the outer periphery of the diaphragm to form an annular swirl flow path,
A plurality of guide grooves are formed in the liquid guide surface, and the guide grooves supply the liquid that has flowed into the secondary side chamber from the valve hole while being inclined in the circumferential direction toward the swirl flow path, and A pressure reducing valve that forms a swirling flow in a swirling flow path.   2. The pressure reducing valve according to claim 1, wherein a spring member that urges the spring force in a direction toward the valve seat with respect to the poppet valve, and fluid pressure is applied to the diaphragm so that the poppet valve is separated from the valve seat. A pressure reducing valve provided in the valve housing for biasing in a direction.   3. The pressure reducing valve according to claim 1 or 2, wherein an elastically deformable partition membrane for partitioning the primary side chamber with the valve seat is provided on the poppet valve.   The pressure reducing valve according to any one of claims 1 to 3, wherein each of the guide grooves is formed straight from a central portion toward an outer peripheral portion.   The pressure reducing valve according to any one of claims 1 to 3, wherein each of the guide grooves is formed by an inner part and an outer side bent in a circumferential direction with respect to the inner part. .   The pressure reducing valve according to any one of claims 1 to 5, wherein the depth of the guide groove is reduced from the central portion toward the outer peripheral portion. The pressure reducing valve according to claim 1, wherein the circumferential width of the guide groove is increased from the central portion toward the outer peripheral portion.

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