Electromagnetic valve manifold

Abstract

To suppress the pressure loss of fluid.SOLUTION: A first check valve 40A is arranged in a first discharge flow path 34. Part of a discharge port 49 overlaps with a valve seat 48 in a direction perpendicular to the moving direction of a valve element 41. Thus, when the valve element 41 separates from the valve seat 48, fluid flowing out of a first discharge port via a valve hole 47 into a valve chest 46 avoids passing through a gap between the valve element 41 and a peripheral wall 45b in a range to the discharge port 49. Accordingly, the fluid flowing out of the first discharge port via the valve hole 47 into the valve chest 46 is discharged via the discharge port 49 into the first discharge flow path 34 without passing through the gap between the valve element 41 and the peripheral wall 45b. As a result, the fluid is smoothly discharged from the first discharge port into the first discharge flow path 34.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a solenoid valve manifold.

Background Art

[0002] A solenoid valve manifold includes a solenoid valve and a manifold base. The solenoid valve has a discharge port. The manifold base has a mounting surface on which the solenoid valve is placed. The manifold base has a discharge flow path. The discharge flow path opens to the mounting surface and communicates with the discharge port.

[0003] In addition, the solenoid valve manifold includes a check valve as disclosed in, for example, Patent Document 1. The check valve has a valve body, a valve housing, and a biasing member. The valve housing has a valve seat, a valve chamber, a peripheral wall, a valve hole, and a discharge port. The valve chamber houses the valve body. The peripheral wall is a cylindrical shape that partitions the valve chamber. The valve hole communicates the valve chamber and the discharge port. The discharge port communicates the valve chamber and the discharge flow path. The valve seat is a part of the valve housing and annularly projects into the valve chamber from a portion around the opening on the valve chamber side in the valve hole. The valve body seats on the valve seat. The biasing member biases the valve body toward the valve seat. The valve body moves in the axial direction of the peripheral wall within the valve chamber to move in a direction of approaching and separating from the valve seat. Then, the check valve allows the flow of fluid from the discharge port to the discharge flow path and blocks the flow of fluid from the discharge flow path to the discharge port. Thereby, malfunction of the solenoid valve due to the backflow of fluid from the discharge flow path to the discharge port is avoided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, for example, the check valve of Patent Document 1 is disposed inside the discharge port. When the valve body is separated from the valve seat, the fluid that has flowed out from the discharge port into the valve chamber through the valve hole passes through the gap between the valve body and the peripheral wall and reaches the discharge port. Thereafter, the fluid is discharged into the discharge flow path through the discharge port. In such a case, if the flow path cross-sectional area of the gap between the valve body and the peripheral wall is not ensured, it becomes difficult for the fluid to be smoothly discharged from the discharge port to the discharge flow path, so that the pressure loss of the fluid increases. On the other hand, in order to ensure the flow path cross-sectional area of the gap between the valve body and the peripheral wall as much as possible, for example, if the size of the valve body is reduced, the diameter of the valve seat also becomes smaller according to the size of the valve body. As a result, the flow path cross-sectional area of the valve hole becomes smaller. Then, it becomes difficult for the fluid to be smoothly discharged from the discharge port to the discharge flow path, so that the pressure loss of the fluid increases.

Means for Solving the Problems

[0006] The solenoid valve manifold for solving the above problems includes a solenoid valve having a discharge port, a mounting surface on which the solenoid valve is mounted, and a manifold base having a discharge flow path that opens on the mounting surface and communicates with the discharge port, a check valve that allows the flow of fluid from the discharge port to the discharge flow path and blocks the flow of fluid from the discharge flow path to the discharge port, the check valve having a valve body, a valve housing having a valve seat on which the valve body seats, and a biasing member that biases the valve body toward the valve seat, the valve housing having a valve chamber that houses the valve body, a cylindrical peripheral wall that partitions the valve chamber, a valve hole that communicates the valve chamber and the discharge port, and a discharge port that communicates the valve chamber and the discharge flow path, the valve seat being a part of the valve housing and protruding annularly into the valve chamber from a portion around the opening on the valve chamber side in the valve hole, the valve body moving back and forth in the axial direction of the peripheral wall in the valve chamber to move in a direction of approaching and separating from the valve seat, the solenoid valve manifold being such that the check valve is disposed in the discharge flow path, and the discharge port is formed in the peripheral wall and at least a part thereof overlaps the valve seat in a direction orthogonal to the moving direction of the valve body.

[0007] In the electromagnetic valve manifold, the discharge flow path has a first flow path extending from the placement surface toward the surface of the manifold base opposite to the placement surface, and a second flow path communicating with an end of the first flow path opposite to the placement surface and extending in a direction intersecting the extending direction of the first flow path. The check valve is arranged in the discharge flow path such that the axial direction of the peripheral wall coincides with the extending direction of the first flow path, and at least a part of the portion where the discharge port is formed in the peripheral wall protrudes from the first flow path to the second flow path. The discharge port may communicate with the second flow path in a state where the axial direction of the discharge port coincides with the extending direction of the second flow path.

[0008] In the electromagnetic valve manifold, the valve housing may have a breathing hole for discharging the fluid between the back surface, which is the surface of the valve body opposite to the valve seat, and the valve housing to the discharge flow path.

[0009] In the electromagnetic valve manifold, the valve housing may be a separate member from the valve body of the electromagnetic valve, and the valve housing may have a flange portion sandwiched between the valve body and the manifold base.

[0010] In the electromagnetic valve manifold, a leakage detection groove may be formed in a part of the back surface of the valve body, which is the surface opposite to the valve seat, and overlaps the valve seat in the moving direction of the valve body.

Advantages of the Invention

[0011] According to this invention, the pressure loss of the fluid can be suppressed.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0013] Hereinafter, an embodiment in which the solenoid valve manifold is embodied will be described with reference to FIGS. 1 to 8. <Solenoid valve manifold 10> As shown in FIG. 1, the solenoid valve manifold 10 includes a solenoid valve 11 and a manifold base 30. A plurality of solenoid valves 11 are arranged in parallel. The manifold base 30 is arranged in a plurality in the parallel arrangement direction of the solenoid valves 11 corresponding to the plurality of solenoid valves 11 arranged in parallel. Therefore, the parallel arrangement direction of the manifold base 30 coincides with the parallel arrangement direction of the solenoid valves 11.

[0014] <Solenoid valve 11> Each solenoid valve 11 has a valve casing 12. The valve casing 12 is in the shape of a long rectangular block. The valve casing 12 has a valve body 13, a first connecting block 14, and a second connecting block 15. The valve body 13 is in the shape of a long rectangular block. The first connecting block 14 is connected to the first end in the longitudinal direction of the valve body 13. The second connecting block 15 is connected to the second end in the longitudinal direction of the valve body 13. The valve body 13 has a main body facing surface 13a facing the manifold base 30.

[0015] <Spool valve hole 16> The valve casing 12 has a spool valve hole 16. The spool valve hole 16 is formed in the valve body 13. The spool valve hole 16 is circular. The spool valve hole 16 extends in the longitudinal direction of the valve body 13. The first end of the spool valve hole 16 opens to the first end face in the longitudinal direction of the valve body 13. The second end of the spool valve hole 16 opens to the second end face in the longitudinal direction of the valve body 13. Therefore, the spool valve hole 16 penetrates the valve body 13 in the longitudinal direction.

[0016] <Spool valve 17> Each solenoid valve 11 has a spool valve 17. The spool valve 17 is accommodated in the spool valve hole 16. The spool valve 17 is accommodated in the spool valve hole 16 with the axial direction of the spool valve 17 coinciding with the axial direction of the spool valve hole 16. The spool valve 17 is accommodated in the spool valve hole 16 so as to be reciprocally movable.

[0017] <Each port of the solenoid valve 11> Each solenoid valve 11 has a supply port P, a first output port A, a second output port B, a first discharge port R1, and a second discharge port R2. Therefore, each solenoid valve 11 of the present embodiment is a 5-port solenoid valve. The first discharge port R1 and the second discharge port R2 are the discharge ports of the solenoid valve 11. Therefore, the solenoid valve 11 has two discharge ports.

[0018] The supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are formed in the valve body 13. The supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 communicate with the spool valve hole 16 respectively.

[0019] The supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are arranged in the order of the first discharge port R1, the first output port A, the supply port P, the second output port B, and the second discharge port R2 from the first end to the second end in the longitudinal direction of the valve body 13 and are formed in the valve body 13. The first ends of the supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 communicate with the spool valve hole 16. The second ends of the supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 open to the main body facing surface 13a of the valve body 13.

[0020] <The first piston 18 and the second piston 19> Each solenoid valve 11 has the first piston 18 and the second piston 19. The first piston 18 is disc-shaped. The first piston 18 is connected to the first end of the spool valve 17. The first piston 18 moves integrally with the spool valve 17. The second piston 19 is disc-shaped. The second piston 19 is connected to the second end of the spool valve 17. The second piston 19 moves integrally with the spool valve 17.

[0021] <The first pilot pressure acting chamber 21> A circular hole-shaped first piston accommodating recess 20 is formed in the first connection block 14. The first piston 18 is reciprocally accommodated in the first piston accommodating recess 20. And the first piston accommodating recess 20 and the first piston 18 define the first pilot pressure acting chamber 21. Pilot fluid is supplied and discharged to and from the first pilot pressure acting chamber 21.

[0022] <The second pilot pressure acting chamber 23> The second connecting block 15 is formed with a second piston accommodating recess 22 in the shape of a circular hole. A second piston 19 is reciprocally accommodated in the second piston accommodating recess 22. And a second pilot pressure acting chamber 23 is partitioned by the second piston accommodating recess 22 and the second piston 19. Pilot fluid is supplied to and discharged from the second pilot pressure acting chamber 23.

[0023] <The first pilot valve V1 and the second pilot valve V2> Each solenoid valve 11 includes a first pilot valve V1 and a second pilot valve V2. Therefore, the solenoid valve 11 is a double solenoid type pilot solenoid valve. Application of voltage to the first pilot valve V1 and the second pilot valve V2 is performed by an external control device such as a programmable logic controller (PLC) not shown in the figure.

[0024] <The first position and the second position of the spool valve 17> The spool valve 17 is switchable between a first position and a second position. For example, assume that voltage is being applied to the first pilot valve V1 and voltage application to the second pilot valve V2 has been stopped. Then, compressed fluid from a fluid supply source not shown is supplied as pilot fluid to the first pilot pressure acting chamber 21 by the first pilot valve V1. On the other hand, the pilot fluid in the second pilot pressure acting chamber 23 is discharged to the atmosphere by the second pilot valve V2. As a result, the spool valve 17 moves toward the second piston accommodating recess 22. Consequently, the spool valve 17 switches to the first position where the supply port P and the first output port A are in communication and the second output port B and the second discharge port R2 are in communication. Also, when the spool valve 17 switches to the first position, the connection between the supply port P and the second output port B is blocked and the connection between the first output port A and the first discharge port R1 is blocked.

[0025] Also, for example, assume that the application of voltage to the first pilot valve V1 is stopped and the application of voltage to the second pilot valve V2 is being performed. Then, the compressed fluid from the fluid supply source is supplied as pilot fluid to the second pilot pressure working chamber 23 by the second pilot valve V2. On the other hand, the pilot fluid in the first pilot pressure working chamber 21 is discharged to the atmosphere by the first pilot valve V1. As a result, the spool valve 17 moves toward the first piston accommodation recess 20. Consequently, the spool valve 17 switches to the second position where the supply port P communicates with the second output port B and the first output port A communicates with the first discharge port R1. Also, when the spool valve 17 switches to the second position, the connection between the supply port P and the first output port A is blocked and the connection between the second output port B and the second discharge port R2 is blocked.

[0026] Therefore, by performing the supply and discharge of the pilot fluid to and from the first pilot pressure working chamber 21 in the first pilot valve V1 and the supply and discharge of the pilot fluid to and from the second pilot pressure working chamber 23 in the second pilot valve V2, the spool valve 17 reciprocates within the spool valve hole 16 between the first position and the second position. And when the spool valve 17 switches between the first position and the second position, the communication between the ports is switched. Note that in FIG. 1, the state where the spool valve 17 is located at the second position is shown.

[0027] <Manifold base 30> Each manifold base 30 is in the shape of a long rectangular block. Each manifold base 30 has a mounting surface 30a. The solenoid valve 11 is mounted on the mounting surface 30a. The longitudinal direction of each manifold base 30 coincides with the longitudinal direction of the valve casing 12.

[0028] Each manifold base 30 has a supply flow path 31, a first output flow path 32, a second output flow path 33, a first discharge flow path 34, and a second discharge flow path 35. The supply flow path 31, the first output flow path 32, the second output flow path 33, the first discharge flow path 34, and the second discharge flow path 35 open to the mounting surface 30a. The first discharge flow path 34 and the second discharge flow path 35 are discharge flow paths of the manifold base 30. Therefore, the manifold base 30 has two discharge flow paths.

[0029] The end of the supply flow path 31 on the mounting surface 30a side communicates with the supply port P. The end of the first output flow path 32 on the mounting surface 30a side communicates with the first output port A. The end of the second output flow path 33 on the mounting surface 30a side communicates with the second output port B. The end of the first discharge flow path 34 on the mounting surface 30a side communicates with the first discharge port R1. The end of the second discharge flow path 35 on the mounting surface 30a side communicates with the second discharge port R2.

[0030] The end of the supply flow path 31 on the side opposite to the mounting surface 30a is connected to a fluid supply source (not shown) via, for example, piping or the like. The end of the first output flow path 32 on the side opposite to the mounting surface 30a and the end of the second output flow path 33 on the side opposite to the mounting surface 30a are respectively connected to a fluid pressure device (not shown) via, for example, piping or the like.

[0031] <The first discharge flow path 34> As shown in FIG. 2, the first discharge flow path 34 has a first flow path 34a and a second flow path 34b, respectively. The first flow path 34a extends from the mounting surface 30a toward the surface 30b of the manifold base 30 on the side opposite to the mounting surface 30a. The end of the first flow path 34a on the mounting surface 30a side communicates with the first discharge port R1. The end of the first flow path 34a on the side opposite to the mounting surface 30a communicates with the second flow path 34b. Therefore, the second flow path 34b communicates with the end of the first flow path 34a on the side opposite to the mounting surface 30a.

[0032] The second flow path 34b extends in a direction orthogonal to the extending direction of the first flow path 34a. Therefore, the second flow path 34b extends in a direction intersecting the extending direction of the first flow path 34a. The second flow path 34b extends in the width direction of the manifold base 30. The first end of the second flow path 34b opens to the first side surface 30c located on one side in the width direction of the manifold base 30. The second end of the second flow path 34b opens to the second side surface 30d located on the other side in the width direction of the manifold base 30. Therefore, the second flow path 34b penetrates the manifold base 30 in the width direction. The second flow paths 34b of the manifold bases 30 adjacent to each other in the juxtaposed direction communicate with each other. Therefore, the second flow paths 34b of each manifold base 30 communicate with each other in the juxtaposed direction to form a common discharge flow path. And each second flow path 34b communicates with the atmosphere.

[0033] <Second discharge flow path 35> As shown in FIG. 3, the second discharge flow path 35 has a first flow path 35a and a second flow path 35b, respectively. The first flow path 35a extends from the mounting surface 30a toward the surface 30b of the manifold base 30 opposite to the mounting surface 30a. The end portion of the first flow path 35a on the mounting surface 30a side communicates with the second discharge port R2. The end portion of the first flow path 35a opposite to the mounting surface 30a communicates with the second flow path 35b. Therefore, the second flow path 35b communicates with the end portion of the first flow path 35a opposite to the mounting surface 30a.

[0034] The second flow path 35b extends in a direction orthogonal to the extending direction of the first flow path 35a. Therefore, the second flow path 35b extends in a direction intersecting the extending direction of the first flow path 35a. The second flow path 35b extends in the width direction of the manifold base 30. The first end of the second flow path 35b opens to the first side surface 30c of the manifold base 30. The second end of the second flow path 35b opens to the second side surface 30d of the manifold base 30. Therefore, the second flow path 35b penetrates the manifold base 30 in the width direction. The second flow paths 35b of the manifold bases 30 adjacent to each other in the juxtaposed direction communicate with each other. Therefore, the second flow paths 35b of each manifold base 30 all communicate with each other in the juxtaposed direction to form a common discharge flow path. And each second flow path 35b communicates with the atmosphere.

[0035] <Gasket 36> As shown in FIG. 1, the solenoid valve manifold 10 includes an annular gasket 36. The gasket 36 is, for example, in a thin plate shape. The gasket 36 seals between the valve casing 12 of each solenoid valve 11 and each manifold base 30.

[0036] <Check valve 40> The solenoid valve manifold 10 includes a check valve 40. The check valve 40 is disposed in the first discharge flow path 34 and the second discharge flow path 35, respectively. In the following description, the check valve 40 disposed in the first discharge flow path 34 may be referred to as "first check valve 40A", and the check valve 40 disposed in the second discharge flow path 35 may be referred to as "second check valve 40B". The first check valve 40A allows the flow of fluid from the first discharge port R1 to the first discharge flow path 34 and blocks the flow of fluid from the first discharge flow path 34 to the first discharge port R1. The second check valve 40B allows the flow of fluid from the second discharge port R2 to the second discharge flow path 35 and blocks the flow of fluid from the second discharge flow path 35 to the second discharge port R2. Since the configuration of the first check valve 40A is the same as that of the second check valve 40B, the first check valve 40A and the second check valve 40B may each be simply referred to as "check valve 40".

[0037] As shown in FIG. 4, the check valve 40 has a valve body 41, a valve housing 42, and a biasing member 43. The valve housing 42 is a separate member from the valve body 13 of the solenoid valve 11.

[0038] <Valve housing 42> The valve housing 42 has a housing body 44 and a housing cover 45. The housing body 44 is cylindrical. The housing cover 45 has a plate-shaped end wall 45a and a cylindrical peripheral wall 45b. The peripheral wall 45b extends cylindrically from the outer peripheral portion of the end wall 45a. The housing cover 45 is attached to the housing body 44 by the end portion of the peripheral wall 45b on the side opposite to the end wall 45a being locked to the outer peripheral surface of the housing body 44.

[0039] <Valve chamber 46> The valve housing 42 has a valve chamber 46. The valve chamber 46 is defined by the housing body 44 and the housing cover 45. Specifically, the valve chamber 46 is a space defined by a first end face located on one axial direction of the housing body 44, the end wall 45a and the peripheral wall 45b of the housing cover 45. Therefore, the valve housing 42 has a cylindrical peripheral wall 45b that defines the valve chamber 46. The valve chamber 46 houses the valve body 41. The moving direction of the valve body 41 within the valve chamber 46 coincides with the axial direction of the peripheral wall 45b.

[0040] <Valve hole 47> The housing body 44 has a valve hole 47. Therefore, the valve housing 42 has a valve hole 47. The valve hole 47 penetrates in the axial direction of the housing body 44. The first end of the valve hole 47 opens to the first end face of the housing body 44. Therefore, the valve hole 47 communicates with the valve chamber 46. The second end of the valve hole 47 opens to the second end face located on the other axial direction of the housing body 44.

[0041] <Valve seat 48> The housing body 44 has a valve seat 48. Accordingly, the valve housing 42 has a valve seat 48. The valve seat 48 is the first end face of the housing body 44, and annularly protrudes into the valve chamber 46 from a portion around the opening on the valve chamber 46 side in the valve hole 47. Accordingly, the valve seat 48 is a part of the valve housing 42, and annularly protrudes into the valve chamber 46 from a portion around the opening on the valve chamber 46 side in the valve hole 47. A valve body 41 seats on the valve seat 48. The valve body 41 moves back and forth in the axial direction of the peripheral wall 45b in the valve chamber 46, and thus moves in a direction of approaching and separating from the valve seat 48.

[0042] <Biasing member 43> The biasing member 43 biases the valve body 41 toward the valve seat 48. The biasing member 43 is a spring. The biasing member 43 is accommodated in the valve chamber 46. The first end of the biasing member 43 is supported by the end wall 45a of the housing cover 45. The second end of the biasing member 43 is supported by the back surface 41a, which is the surface on the side opposite to the valve seat 48 of the valve body 41.

[0043] <Discharge port 49> The housing cover 45 has a discharge port 49. Accordingly, the valve housing 42 has a discharge port 49. A plurality of discharge ports 49 are formed in the peripheral wall 45b. In the present embodiment, four discharge ports 49 are formed in the peripheral wall 45b. The four discharge ports 49 are arranged at equal intervals in the circumferential direction of the peripheral wall 45b. Accordingly, the four discharge ports 49 are arranged at intervals of 90 degrees in the circumferential direction of the peripheral wall 45b. Each discharge port 49 penetrates the peripheral wall 45b.

[0044] The housing cover 45 is attached to the housing body 44 such that the edge portion on the housing body 44 side at each discharge port 49 is continuous with the first end face of the housing body 44. Thereby, a part of each discharge port 49 overlaps with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41.

[0045] <Breather hole 50> The housing cover 45 has a breathing hole 50. Accordingly, the valve housing 42 has the breathing hole 50. A plurality of breathing holes 50 are formed at a portion near the end wall 45a in the peripheral wall 45b. Each breathing hole 50 penetrates the peripheral wall 45b.

[0046] <Valve body 41> The valve body 41 seats on the valve seat 48, thereby blocking the communication between the valve hole 47 and the valve chamber 46. Accordingly, the state where the valve body 41 seats on the valve seat 48 is the state where the check valve 40 is closed. On the other hand, the valve body 41 allows the communication between the valve hole 47 and the valve chamber 46 by separating from the valve seat 48. Accordingly, the state where the valve body 41 is separated from the valve seat 48 is the state where the check valve 40 is open.

[0047] <Leakage detection groove 51> As shown in FIGS. 5 and 6, a leakage detection groove 51 is formed in the valve body 41. The leakage detection groove 51 is formed in a part of the back surface 41a of the valve body 41 that overlaps the valve seat 48 in the moving direction of the valve body 41. In the present embodiment, two leakage detection grooves 51 are formed in the back surface 41a of the valve body 41.

[0048] <Flange portion 52> As shown in FIG. 4, the housing body 44 has a flange portion 52. Accordingly, the valve housing 42 has the flange portion 52. The flange portion 52 is a thin plate shape extending in a direction orthogonal to the axial direction of the housing body 44 from a portion on the second end face side of the outer peripheral surface of the housing body 44. In the present embodiment, two flange portions 52 protrude from the housing body 44. In FIG. 4, only one of the two flange portions 52 is shown for convenience of illustration.

[0049] <Relationship between the first check valve 40A and the first discharge passage 34> As shown in FIGS. 2 and 7, the first check valve 40A is inserted into the first discharge passage 34 in a state where the axial direction of the peripheral wall 45b coincides with the extending direction of the first flow passage 34a. The space between the housing main body 44 and the first flow passage 34a is sealed by a seal member 53. As shown in FIG. 2, the portion of the peripheral wall 45b where the discharge port 49 is formed protrudes from the first flow passage 34a to the second flow passage 34b. Therefore, the first check valve 40A is arranged in the first discharge passage 34 in a state where the axial direction of the peripheral wall 45b coincides with the extending direction of the first flow passage 34a and at least the portion of the peripheral wall 45b where the discharge port 49 is formed protrudes from the first flow passage 34a to the second flow passage 34b. Further, two of the four discharge ports 49 communicate with the second flow passage 34b in a state where the axial direction of the two discharge ports 49 coincides with the extending direction of the second flow passage 34b. Each discharge port 49 communicates with the second flow passage 34b. Therefore, each discharge port 49 communicates the valve chamber 46 with the first discharge passage 34. Also, each breathing hole 50 communicates the space between the back surface 41a of the valve body 41 and the valve housing 42 with the second flow passage 34b of the first discharge passage 34.

[0050] As shown in FIG. 7, each flange portion 52 is placed around the opening of the first flow passage 34a on the mounting surface 30a. When the valve body 13 is attached to the manifold base 30, each flange portion 52 is clamped between the valve body 13 and the manifold base 30. The first check valve 40A is detachably arranged with respect to the first discharge passage 34 by clamping each flange portion 52 between the valve body 13 and the manifold base 30. The valve hole 47 of the first check valve 40A communicates the valve chamber 46 with the first discharge port R1.

[0051] <Relationship between the second check valve 40B and the second discharge passage 35> As shown in FIGS. 3 and 7, the second check valve 40B is inserted into the second discharge passage 35 in a state where the axial direction of the peripheral wall 45b coincides with the extending direction of the first passage 35a. Note that the space between the housing main body 44 and the first passage 35a is sealed by a seal member 53. Then, as shown in FIG. 3, the portion of the peripheral wall 45b where the discharge port 49 is formed protrudes from the first passage 35a to the second passage 35b. Therefore, the second check valve 40B is disposed in the second discharge passage 35 in a state where the axial direction of the peripheral wall 45b coincides with the extending direction of the first passage 35a and at least the portion of the peripheral wall 45b where the discharge port 49 is formed protrudes from the first passage 35a to the second passage 35b. Further, two of the four discharge ports 49 communicate with the second passage 35b in a state where the axial direction of the two discharge ports 49 coincides with the extending direction of the second passage 35b. Each discharge port 49 communicates with the second passage 35b. Therefore, each discharge port 49 communicates the valve chamber 46 with the second discharge passage 35. Also, each breathing hole 50 communicates the space between the back surface 41a of the valve body 41 and the valve housing 42 with the second passage 35b of the second discharge passage 35.

[0052] As shown in FIG. 7, each flange portion 52 is placed around the opening of the first passage 35a on the mounting surface 30a. Then, when the valve body 13 is attached to the manifold base 30, each flange portion 52 is clamped between the valve body 13 and the manifold base 30. The second check valve 40B is detachably disposed with respect to the second discharge passage 35 by clamping each flange portion 52 between the valve body 13 and the manifold base 30. The valve hole 47 of the second check valve 40B communicates the valve chamber 46 with the second discharge port R2.

[0053] [Operation of the Embodiment] Next, the operation of this embodiment will be described. For example, when the spool valve 17 is switched to the first position, the fluid supplied to the supply port P is output to the fluid pressure device via the first output port A and the first output flow path 32. Then, the fluid from the fluid pressure device tries to flow into the second discharge flow path 35 via the second output flow path 33, the second output port B, and the second discharge port R2.

[0054] At this time, when the pressure of the fluid trying to flow into the second discharge flow path 35 via the second discharge port R2 resists the biasing force of the biasing member 43, the valve body 41 separates from the valve seat 48. As a result, the second check valve 40B is in an open state. A part of each discharge port 49 overlaps with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41. Therefore, when the valve body 41 separates from the valve seat 48, the fluid flowing out from the second discharge port R2 into the valve chamber 46 via the valve hole 47 does not pass through the gap between the valve body 41 and the peripheral wall 45b until it reaches the discharge port 49. Thus, the fluid flowing out from the second discharge port R2 into the valve chamber 46 via the valve hole 47 is discharged to the second discharge flow path 35 via each discharge port 49 without passing through the gap between the valve body 41 and the peripheral wall 45b. Therefore, the fluid is smoothly discharged from the second discharge port R2 to the second discharge flow path 35. The fluid discharged to the second discharge flow path 35 is discharged to the outside from the second discharge flow path 35.

[0055] Also, when the valve body 41 of the second check valve 40B separates from the valve seat 48, the fluid between the back surface 41a of the valve body 41 and the valve housing 42 is discharged to the second discharge flow path 35 via each breathing hole 50. Therefore, each breathing hole 50 of the second check valve 40B discharges the fluid between the back surface 41a of the valve body 41 and the valve housing 42 to the second discharge flow path 35. Therefore, when the valve body 41 separates from the valve seat 48, the problem that the valve body 41 is pushed back toward the valve seat 48 due to the increase in the pressure between the back surface 41a of the valve body 41 and the valve housing 42 is avoided. As a result, the vibration of the valve body 41 when it separates from the valve seat 48 is suppressed.

[0056] The valve body 41 of the first check valve 40A is seated on the valve seat 48 by the biasing force of the biasing member 43. As a result, the first check valve 40A is in a closed state. Therefore, it is avoided that the fluid discharged from another solenoid valve 11 and flowing through the second flow path 34b flows backward to the first discharge port R1. Therefore, it is avoided that the solenoid valve 11 malfunctions.

[0057] On the other hand, as shown in FIG. 1, when the spool valve 17 is switched to the second position, the fluid supplied to the supply port P is output to the fluid pressure device via the second output port B and the second output flow path 33. Then, the fluid from the fluid pressure device tries to flow into the first discharge flow path 34 via the first output flow path 32, the first output port A, and the first discharge port R1.

[0058] At this time, when the pressure of the fluid trying to flow into the first discharge flow path 34 via the first discharge port R1 resists the biasing force of the biasing member 43, the valve body 41 separates from the valve seat 48. As a result, the first check valve 40A is in an open state. A part of each discharge port 49 overlaps with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41. Therefore, when the valve body 41 separates from the valve seat 48, the fluid flowing out from the first discharge port R1 into the valve chamber 46 through the valve hole 47 does not pass through the gap between the valve body 41 and the peripheral wall 45b until it reaches the discharge port 49. Therefore, the fluid flowing out from the first discharge port R1 into the valve chamber 46 through the valve hole 47 is discharged to the first discharge flow path 34 through each discharge port 49 without passing through the gap between the valve body 41 and the peripheral wall 45b. Therefore, the fluid is smoothly discharged from the first discharge port R1 to the first discharge flow path 34. The fluid discharged to the first discharge flow path 34 is discharged to the outside from the first discharge flow path 34.

[0059] Also, when the valve body 41 of the first check valve 40A is separated from the valve seat 48, the fluid between the back surface 41a of the valve body 41 and the valve housing 42 is discharged to the first discharge passage 34 through each breathing hole 50. Therefore, each breathing hole 50 of the first check valve 40A discharges the fluid between the back surface 41a of the valve body 41 and the valve housing 42 to the first discharge passage 34. Thus, when the valve body 41 is separated from the valve seat 48, the problem that the valve body 41 is pushed back toward the valve seat 48 due to the increase in the pressure between the back surface 41a of the valve body 41 and the valve housing 42 is avoided. As a result, the vibration of the valve body 41 when it is separated from the valve seat 48 is suppressed.

[0060] The valve body 41 of the second check valve 40B is seated on the valve seat 48 by the biasing force of the biasing member 43. Thereby, the second check valve 40B is in a closed state. Therefore, the fluid discharged from another solenoid valve 11 and flowing through the second passage 35b is prevented from flowing backward to the second discharge port R2. Therefore, the malfunction of the solenoid valve 11 is avoided.

[0061] As shown in FIG. 8, for example, it is assumed that an operator erroneously houses the valve body 41 in the valve chamber 46 so that the back surface 41a of the valve body 41 of the first check valve 40A faces the valve seat 48. In this case, when the valve body 41 is seated on the valve seat 48, the valve hole 47 and the valve chamber 46 communicate with each other through the leak detection groove 51. Therefore, since the first discharge port R1 and the first discharge passage 34 are always in communication, the operator can grasp the incorrect assembly by detecting the leakage of the fluid. For example, when the operator erroneously houses the valve body 41 in the valve chamber 46 so that the back surface 41a of the valve body 41 of the second check valve 40B faces the valve seat 48, the same applies, and thus the detailed description thereof is omitted.

[0062] [Effects of the Embodiment] In the above embodiment, the following effects can be obtained. Since the effects related to the first check valve 40A and the effects related to the second check valve 40B are the same, only the effects related to the first check valve 40A will be described in the following description of the effects.

[0063] (1) The first check valve 40A is disposed in the first discharge passage 34. A part of the discharge port 49 overlaps with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41. According to this, when the valve body 41 is separated from the valve seat 48, the fluid flowing out from the first discharge port R1 through the valve hole 47 into the valve chamber 46 does not pass through the gap between the valve body 41 and the peripheral wall 45b until it reaches the discharge port 49. Therefore, the fluid flowing out from the first discharge port R1 through the valve hole 47 into the valve chamber 46 is discharged to the first discharge passage 34 through the discharge port 49 without passing through the gap between the valve body 41 and the peripheral wall 45b. Accordingly, since the fluid is smoothly discharged from the first discharge port R1 to the first discharge passage 34, the pressure loss of the fluid can be suppressed.

[0064] (2) The discharge port 49 communicates with the second flow path 34b in a state where the axial direction of the discharge port 49 and the extending direction of the second flow path 34b coincide. For this reason, there is no wall surface forming the first discharge passage 34 at the discharge destination from the discharge port 49. Therefore, the fluid flowing out from the first discharge port R1 through the valve hole 47 into the valve chamber 46 is smoothly discharged to the second flow path 34b through the discharge port 49 without colliding with the wall surface of the first discharge passage 34. Thus, it is possible to further easily suppress the pressure loss of the fluid.

[0065] (3) The valve housing 42 has a breathing hole 50 for discharging the fluid between the back surface 41a, which is the surface of the valve body 41 opposite to the valve seat 48, and the valve housing 42 to the first discharge passage 34. According to this, for example, when the valve body 41 is separated from the valve seat 48, the fluid between the back surface 41a of the valve body 41 and the valve housing 42 can be discharged to the first discharge passage 34 through the breathing hole 50. Therefore, when the valve body 41 is separated from the valve seat 48, it is possible to avoid the problem that the valve body 41 is pushed back toward the valve seat 48 due to the increase in the pressure between the back surface 41a of the valve body 41 and the valve housing 42. As a result, it is possible to suppress the valve body 41 from vibrating when the valve body 41 is separated from the valve seat 48, so that the reliability can be improved.

[0066] (4) The valve housing 42 is a separate member from the valve body 13 of the solenoid valve 11. The valve housing 42 has a flange portion 52 that is clamped between the valve body 13 and the manifold base 30. According to this, for example, when performing maintenance on the first check valve 40A, by releasing the clamping between the valve body 13 and the manifold base 30 at the flange portion 52, the first check valve 40A can be removed from the first discharge passage 34. Since the valve housing 42 is a separate member from the valve body 13 of the solenoid valve 11, for example, when it is necessary to replace the first check valve 40A with a new first check valve 40A, there is no need to replace the valve body 13 with a new valve body 13. Therefore, cost reduction can be achieved.

[0067] (5) On the back surface 41a of the valve body 41, which is the surface opposite to the valve seat 48, a leakage detection groove 51 is formed in a part of the portion that overlaps the valve seat 48 in the moving direction of the valve body 41. According to this, for example, even if an operator accidentally accommodates the valve body 41 in the valve chamber 46 such that the back surface 41a of the valve body 41 faces the valve seat 48, when the valve body 41 seats on the valve seat 48, the valve hole 47 and the valve chamber 46 communicate with each other through the leakage detection groove 51. Therefore, since the first discharge port R1 and the first discharge passage 34 are always in a communicating state, the operator can grasp the misassembly by detecting the leakage of the fluid.

[0068] [Modification Example] Note that the above embodiment can be modified and implemented as follows. The above embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0069] · In the embodiment, a part of the discharge port 49 overlapped with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41, but it is not limited to this. For example, all parts of the discharge port 49 may overlap with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41. The main point is that at least a part of the discharge port 49 should overlap with the valve seat 48 in a direction orthogonal to the moving direction of the valve body 41.

[0070] · In the embodiment, the discharge port 49 may not communicate with the second flow paths 34b and 35b in a state where the axial direction of the discharge port 49 coincides with the extending direction of the second flow paths 34b and 35b. · In the embodiment, four discharge ports 49 were formed in the peripheral wall 45b. However, the present invention is not limited to this, and the number of discharge ports 49 formed in the peripheral wall 45b is not particularly limited. For example, six discharge ports 49 may be formed in the peripheral wall 45b, and the six discharge ports 49 may be arranged at equal intervals in the circumferential direction of the peripheral wall 45b. Therefore, the six discharge ports 49 may be arranged at intervals of 60 degrees in the circumferential direction of the peripheral wall 45b.

[0071] · In the embodiment, a plurality of breathing holes 50 were formed in a portion of the peripheral wall 45b near the end wall 45a. However, the present invention is not limited to this, and for example, the breathing holes 50 may be formed in the end wall 45a. In short, the breathing holes 50 only need to be able to discharge the fluid between the back surface 41a of the valve body 41 and the valve housing 42 to the first discharge flow path 34 or the second discharge flow path 35.

[0072] · In the embodiment, the valve housing 42 may not have the breathing holes 50. · In the embodiment, a leakage detection groove 51 may not be formed in the back surface 41a of the valve body 41.

[0073] · In the embodiment, the biasing member 43 does not have to be a spring, and for example, it may be an elastic body that can be elastically deformed, such as a rubber member. In short, the biasing member 43 only needs to be a member that biases the valve body 41 toward the valve seat 48.

[0074] · In the embodiment, for example, the valve housing 42 and the valve body 13 of the solenoid valve 11 may be integrally formed. In this case, the flange portion 52 is unnecessary. · In the embodiment, the solenoid valve 11 was a double solenoid type pilot solenoid valve. However, the present invention is not limited to this, and for example, it may be a single solenoid type pilot solenoid valve equipped with only one pilot valve.

[0075] · In an embodiment, the solenoid valve 11 may be, for example, a 4-port solenoid valve with the second discharge port R2 omitted. The main point is that the solenoid valve 11 only needs to have at least one discharge port. Further, the solenoid valve 11 may be a 3-port solenoid valve having a supply port, an output port, and a discharge port.

Explanation of Signs

[0076] 10… solenoid valve manifold, 11… solenoid valve, 13… valve body, 30… manifold base, 30a… mounting surface, 34… first discharge passage which is a discharge passage, 34a, 35a… first passages, 34b, 35b… second passages, 35… second discharge passage which is a discharge passage, 40… check valve, 40A… first check valve which is a check valve, 40B… second check valve which is a check valve, 41… valve element, 41a… back surface, 42… valve housing, 43… biasing member, 45b… peripheral wall, 46… valve chamber, 47… valve hole, 48… valve seat, 49… discharge port, 50… breathing hole, 51… leakage detection groove, 52… flange portion, R1… first discharge port which is a discharge port, R2… second discharge port which is a discharge port.

Claims

1. A solenoid valve having a discharge port, A mounting surface on which the solenoid valve is mounted, and a manifold base having a discharge channel that opens to the mounting surface and communicates with the discharge port, A check valve that allows fluid to flow from the discharge port to the discharge channel and blocks fluid flow from the discharge channel to the discharge port, The check valve, A valve body, A valve housing having a valve seat on which the valve body seats, A biasing member that biases the valve body toward the valve seat, The valve housing, A valve chamber that houses the valve body, A cylindrical peripheral wall that partitions the valve chamber, A valve hole that communicates the valve chamber with the discharge port, An outlet that communicates the valve chamber with the discharge channel, The valve seat is a part of the valve housing and protrudes annularly into the valve chamber from a portion around the opening on the valve chamber side in the valve hole, The valve body is a solenoid valve manifold that moves back and forth in the axial direction of the peripheral wall within the valve chamber to move in a direction of approaching and separating from the valve seat, The check valve is disposed within the discharge channel, The outlet is formed in the peripheral wall and at least a part thereof overlaps the valve seat in a direction orthogonal to the moving direction of the valve body, The discharge channel, A first channel that extends from the mounting surface toward the surface of the manifold base opposite to the mounting surface, A second channel that communicates with an end of the first channel opposite to the mounting surface and extends in a direction intersecting the extending direction of the first channel, The check valve is disposed within the discharge channel such that the axial direction of the peripheral wall coincides with the extending direction of the first channel and at least the portion of the peripheral wall where the outlet is formed protrudes from the first channel to the second channel, The solenoid valve manifold, wherein the outlet communicates with the second channel in a state where the axial direction of the outlet coincides with the extending direction of the second channel.

2. The solenoid valve manifold according to claim 1, wherein the valve housing has a breathing hole that discharges fluid between the back surface, which is the surface of the valve body opposite to the valve seat, and the valve housing to the discharge channel.

3. The valve housing is a separate member from the valve body of the solenoid valve, The electromagnetic valve manifold according to claim 1 or claim 2, characterized in that the valve housing has a flange portion sandwiched between the valve body and the manifold base.

4. The electromagnetic valve manifold according to any one of claims 1 to 3, characterized in that a leakage detection groove is formed in a part of a back surface, which is a surface on the side opposite to the valve seat in the valve body, that overlaps the valve seat in the moving direction of the valve body.

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