JP6084413B2 - Solenoid valve device - Google Patents

Description

  The present invention relates to an electromagnetic valve device having a valve body that switches a flow path by energizing a coil.

  2. Description of the Related Art Conventionally, an electromagnetic valve is composed of a main valve portion that switches a flow path by moving a valve body toward and away from a valve seat, and a solenoid portion that moves the valve body of the main valve portion. The solenoid part includes a fixed iron core fixed to the case, a movable iron core movable with respect to the fixed iron core, and a coil wound around the fixed iron core. And a movable iron core is moved by supplying with electricity to a coil, and a valve body is moved from an original position by interlocking a valve body with this movable iron core. Moreover, the valve body can be held at the position moved from the original position by maintaining energization to the coil.

  Among such solenoid valves, for example, as shown in Patent Document 1, a self-holding solenoid valve is disclosed in which a permanent magnet is disposed so as to sandwich the fixed core at the periphery of the fixed core. In such a solenoid valve, when the coil is de-energized, the attraction force due to the coil's excitation action disappears, but the part of the magnetic flux generated from the permanent magnet passes through the fixed iron core, causing the valve element to move by energization. Held in the position. For this reason, it is energized when the position of the valve element is switched, but it is not energized when the position of the valve element is maintained. Therefore, when the position of the valve element is maintained, the solenoid valve continuously energizes the coil. However, power consumption can be reduced and heat radiation can be reduced. Further, in such a solenoid valve, the movable iron core is moved by energizing the coil in the opposite direction, and the valve body is moved to the original position by interlocking the valve body with the movable iron core. .

JP 2011-133071 A

  However, in such a self-holding solenoid valve, since the valve body is held at the starting position by the magnetic flux generated from the permanent magnet, the power consumption is small and the heat radiation can be reduced. If it is not arranged at the position and the power is cut off, the valve body cannot be returned to the original position, and the valve body may be held.

  The present invention has been made in view of the above-described conventional problems, and its purpose is to reduce power consumption, reduce heat dissipation, and dispose the valve element even when it is disconnected. An object of the present invention is to provide an electromagnetic valve device that can return the valve to its original position.

To solve the above SL problem, an invention according to claim 1, the fixed iron core coil is wound around, is disposed on the fixed iron core coaxially, depending on the energized state of the coil the The movable core can be displaced between a separation position where the fixed iron core is detached and an adsorption position where the fixed iron core is adsorbed. A permanent magnet for holding the state of attracting or repelling the movable iron core, a valve body that switches a flow path according to the displacement of the movable core, a first position that does not interfere with the displacement of the movable core, and a plurality of solenoid valves having a housing part displaceable return member between the second position to return the movable core to the original position, the previous SL return member is arranged, the air supply when a power interruption By switching the presence or absence, the plurality of One air supply equipment for displacing the return member to said second position from said first position in the solenoid valve, the air supplied from said one air feed device, respectively the storage unit in the plurality of solenoid valves The gist of the invention is that it includes a manifold base having an output flow path that is branched and supplied .

According to a second aspect of the invention, in the electromagnetic valve device of claim 1, wherein the return member, and the first position and the second position along a direction perpendicular to the axis of said movable iron core One end of the return member facing the movable iron core is tapered toward the movable iron core, and the return member is moved from the first position to the second position on the movable iron core. The gist of the present invention is that a sliding contact portion is formed in which the taper formed on the return member is in sliding contact when displaced.

The invention according to claim 3 is the electromagnetic valve device according to claim 1 or 2 , further comprising a biasing member that biases the return member from the second position to the first position. To do.

According to a fourth aspect of the present invention, in the electromagnetic valve device according to the second aspect of the present invention, a third position that is separate from the operation portion operable by an operator and the return member and does not interfere with the displacement of the movable iron core. And a second return member displaceable between the movable iron core and a fourth position that displaces the movable iron core to the disengagement position or the suction position, and the sliding contact portion is arranged with respect to the entire circumference of the movable iron core. And the second return member is displaced between the third position and the fourth position along a direction orthogonal to the axis of the movable core, and is moved to the movable core of the second return member. The gist of the present invention is that a second taper is formed at one of the opposing ends toward the movable iron core.

  According to the present invention, power consumption can be reduced, heat dissipation can be reduced, and the valve element can be returned to its original position even when power is interrupted.

The top view which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. Sectional drawing which shows the solenoid valve manifold of embodiment. (A)-(c) is sectional drawing which shows a solenoid valve manifold.

[First Embodiment]
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the solenoid valve manifold 10 in this embodiment includes a plurality of solenoid valves 11, 12 </ b> A to 12 </ b> D and supply / discharge of air (fluid) as a fluid to / from the plurality of solenoid valves 11, 12 </ b> A to 12 </ b> D. It is comprised from the manifold base 13 for performing. The plurality of solenoid valves 11, 12 </ b> A to 12 </ b> D are arranged in parallel by being connected to the manifold base 13. Hereinafter, the left-right direction in FIG. 1 is defined as a parallel arrangement direction LR of the solenoid valve manifold 10.

  The plurality of solenoid valves 11, 12 </ b> A to 12 </ b> D are composed of one direct acting three-port solenoid valve 11 and a plurality of self-holding solenoid valves 12 </ b> A to 12 </ b> D. The direct acting three-port solenoid valve 11 is a solenoid valve that switches the position of the valve body between energization and non-energization. The self-holding solenoid valves 12A to 12D are solenoid valves that switch the position of the valve body when energized and hold the position of the valve body when not energized. One direct acting three-port solenoid valve 11 is disposed at one end of the plurality of self-holding solenoid valves 12A to 12D in the juxtaposed direction LR.

  In the present embodiment, the manifold base 13 is formed with the respective channels 14 to 19 as separate channels. Specifically, the manifold base 13 is formed with a concentrated air supply passage 14 that penetrates in the juxtaposed direction LR and branches to each of the plurality of self-holding solenoid valves 12A to 12D. A positive pressure supply source (not shown) is connected to one of the air supply ports 14 a in the central air supply channel 14, and positive pressure is applied to each of the plurality of self-holding electromagnetic valves 12 </ b> A to 12 </ b> D via the central air supply channel 14. Air is supplied intensively. Note that a sealing member (not shown) is disposed at the other air supply port 14b in the central air supply channel 14, and the central air supply channel 14 is sealed.

  The manifold base 13 is formed with output flow paths 15A to 15D communicating with the plurality of self-holding solenoid valves 12A to 12D. Pneumatic devices such as air cylinders are connected to the openings 15Aa to 15Da of the output flow paths 15A to 15D via tube piping (not shown), and a plurality of self-holding solenoid valves 12A are connected via the output flow paths 15A to 15D. Positive pressure air is supplied to the pneumatic equipment from ~ 12D.

  The manifold base 13 is formed with a concentrated exhaust passage 16 that penetrates in the juxtaposed direction LR and branches into each of the plurality of self-holding solenoid valves 12A to 12D. The concentrated exhaust passage 16 is a passage for exhausting air from each of the plurality of self-holding solenoid valves 12A to 12D intensively to the outside. Note that no sealing member is provided at both the exhaust ports 16a and 16b in the concentrated exhaust flow path 16, and the concentrated exhaust flow path 16 is not sealed.

  On the other hand, an air supply passage 17 communicating with the direct acting three-port solenoid valve 11 is formed in the manifold base 13. A positive pressure supply source (not shown) is also connected to the air supply port 17 a of the air supply passage 17, and positive pressure air is supplied to the direct acting three-port solenoid valve 11 through the air supply passage 17.

  The manifold base 13 is formed with an output flow path 18 that penetrates in the juxtaposed direction LR and branches from the direct acting three-port solenoid valve 11 to each of the plurality of self-holding solenoid valves 12A to 12D. ing. This output flow path 18 is a flow path for intensively supplying positive pressure air from one direct acting three-port solenoid valve 11 to each of the plurality of self-holding solenoid valves 12A to 12D. Further, sealing members (not shown) are also provided in the openings 18 a and 18 b at both ends of the output flow path 18 and the opening 18 c on the back surface, so that the output flow path 18 is sealed.

  The manifold base 13 is formed with an exhaust passage 19 that communicates with one direct acting three-port solenoid valve 11. The exhaust passage 19 is a passage for exhausting air from one direct acting three-port solenoid valve 11 to the outside. Note that a sealing member is not provided at the exhaust port 19a in the exhaust passage 19, and the exhaust passage 19 is not sealed.

First, the direct acting three-port solenoid valve 11 will be described with reference to FIGS.
As shown in FIGS. 2 to 4, the direct acting three-port solenoid valve 11 includes a main valve portion 20 having a valve body 26 for switching an air flow path, and a solenoid portion 40 for driving the valve body 26. It consists of and.

  The main valve portion 20 includes a long box-like body 21 made of a non-magnetic material (made of a synthetic resin material), and an insertion hole 21a is formed in the body 21 from the other end in the longitudinal direction to one end. ing. In addition, a supply port 22, an output port 23, and a discharge port 24 are formed in this order on one side surface of the body 21 from the other end in the longitudinal direction of the body 21 toward one end, and one end thereof is inserted. It opens toward the hole 21a.

  An air supply passage 17 formed in the manifold base 13 is connected to the other end of the supply port 22, and positive pressure air is supplied from a positive pressure supply source (not shown). An output flow path 18 formed in the manifold base 13 is connected to the other end of the output port 23. The output port 23 may supply positive pressure air intensively to each of the self-holding solenoid valves 12A to 12D, and air from each of the self-holding solenoid valves 12A to 12D may be supplied to the output port 23. May be supplied. Further, an exhaust passage 19 formed in the manifold base 13 is connected to the other end of the discharge port 24, and the exhaust is discharged to the outside through the exhaust passage 19.

  A valve chamber 25 is defined in a space communicating with the output port 23. A rubber valve body 26 is accommodated in the valve chamber 25, and the valve body 26 can be brought into contact with and separated from each of the supply valve seat 27 and the discharge valve seat 28 in the valve chamber 25. In the valve chamber 25, a supply valve seat 27 is provided on the other end surface side of the valve body 26, and a discharge valve seat 28 is provided on one end surface side of the valve body 26 so as to face the supply valve seat 27. ing. The valve body 26 is fitted on the inner peripheral surface of a cylindrical valve guide 29 inserted into the insertion hole 21 a and is provided integrally with the valve guide 29. A valve return spring 30 is disposed between one end surface of the valve body 26 and the inner surface of the valve chamber 25 facing the one end surface, and the valve body 26 has a spring force of the valve return spring 30. Is biased away from the discharge valve seat 28.

  As shown in FIG. 3, when the valve body 26 moves in a direction away from the discharge valve seat 28 by the spring force of the valve return spring 30, the valve body 26 is seated on the supply valve seat 27 and the output port 23. The discharge port 24 communicates with the valve chamber 25. The positive pressure air discharged from each of the self-holding solenoid valves 12 </ b> A to 12 </ b> D to the output port 23 is discharged from the discharge port 24.

  On the other hand, as shown in FIG. 4, when the valve body 26 moves away from the supply valve seat 27 against the spring force of the valve return spring 30, the valve body 26 is seated on the discharge valve seat 28. The supply port 22 and the output port 23 communicate with each other via the valve chamber 25, and positive pressure air is supplied from the output port 23 to each of the self-holding solenoid valves 12A to 12D.

  Next, as shown in FIGS. 2 to 4, the solenoid unit 40 includes a cylindrical magnetic cover 41 made of a magnetic material, and one end of the magnetic cover 41 is in addition to the body 21 of the main valve unit 20. It is joined to the end. A cylindrical bobbin 42 around which a plurality of coils 42 a are wound is disposed inside the magnetic cover 41.

  A guide ring 43 is provided inside the magnetic cover 41 and closer to the body 21 than the bobbin 42, and between the other end inner surface of the magnetic cover 41 and the other end surface of the main valve portion 20 on the body 21 side. The bobbin 42 and the guide ring 43 are sandwiched. In the guide ring 43 and the bobbin 42, a movable iron core 44 made of a magnetic material and having a substantially cylindrical shape is inserted. One end side of the movable iron core 44 extends so as to enter the other end side of the insertion hole 21 a, and one end surface of the movable iron core 44 is in contact with the other end surface of the valve guide 29. In addition, a flange 44a protruding outward is formed at one end of the movable iron core 44, and an iron core return spring 45 is interposed between the guide ring 43 and the flange 44a. The movable iron core 44 is biased in the direction of pressing the valve guide 29 by the spring force of the iron core return spring 45.

  The bobbin 42 has a substantially cylindrical shape and a magnetic fixed iron core 46 inserted therein. That is, the fixed iron core 46 has a coil 42 a wound around the bobbin 42. One end surface of the fixed iron core 46 is a magnetic pole surface, and this magnetic pole surface is disposed so as to face the other end surface of the movable iron core 44. Therefore, the movable iron core 44 and the fixed iron core 46 are arranged coaxially.

  As shown in FIG. 3, when the coil 42a is energized and the coil 42a is excited, a magnetic circuit that passes through the fixed core 46, the guide ring 43, and the magnetic cover 41 is formed around the coil 42a. As a result, the exciting action of the coil 42 a resists the spring force of the iron core return spring 45, the movable iron core 44 is attracted and moved toward the fixed iron core 46, and the movable iron core 44 comes into contact with the fixed iron core 46. . As a result, the valve body 26 is seated on the supply valve seat 27, and the output port 23 and the discharge port 24 communicate with each other via the valve chamber 25.

  On the other hand, as shown in FIG. 4, when the coil 42 a is not energized and the coil 42 a is not excited, a magnetic circuit is not formed, and the movable core 44 is moved to the body 21 side by the spring force of the core return spring 45. And the movable iron core 44 is not in contact with the fixed iron core 46. As a result, the valve body 26 is seated on the discharge valve seat 28, and the supply port 22 and the output port 23 communicate with each other via the valve chamber 25.

  As described above, the direct acting three-port solenoid valve 11 according to the present embodiment does not communicate the supply port 22 and the output port 23 when energized, but communicates the output port 23 and the discharge port 24 when deenergized. Then, the output port 23 and the discharge port 24 do not communicate with each other, and the supply port 22 and the output port 23 communicate with each other. Therefore, the positive pressure air from the supply port 22 is not supplied to each of the self-holding solenoid valves 12A to 12D via the output port 23 when energized, while the positive pressure from the supply port 22 is not energized. Air is supplied to each of the self-holding solenoid valves 12 </ b> A to 12 </ b> D via the output port 23.

  Further, the direct acting three-port solenoid valve 11 is a solenoid valve capable of self-returning to the original position where the supply port 22 and the output port 23 are communicated with each other because the power supply is not energized when the power is cut off. This power interruption indicates a situation in which the power supply voltage is not supplied from the power supply device to each of the solenoid valves 11, 12A to 12D. The power supply voltage is not supplied by the operator and the power supply voltage is not intended by the operator. Includes situations that are not supplied. In the present embodiment, a position where the movable iron core contacts the fixed iron core may be indicated as an adsorption position, and a position where the movable iron core does not contact the fixed iron core may be indicated as a separation position.

  In the present embodiment, in the direct acting three-port solenoid valve 11, when the power supply voltage is normally supplied, the coil 42a is always energized. For this reason, the coil 42a is not energized only when the power supply voltage is not supplied. Therefore, the direct acting three-port solenoid valve 11 supplies positive pressure air to each of the self-holding solenoid valves 12A to 12D when power is cut off.

  Next, the self-holding solenoid valves 12A to 12D will be described with reference to FIGS. In the present embodiment, since the plurality of self-holding solenoid valves 12A to 12D have the same configuration, the self-holding solenoid valve 12A will be described as a representative, and other self-holding solenoid valves 12B to 12D. The description of is omitted.

  As shown in FIGS. 5 to 7, the self-holding solenoid valve 12 </ b> A includes a main valve portion 50 having a valve body 59 for switching the air flow path, a solenoid portion 70 for driving the valve body 59, It is composed of a self-return mechanism 80 for returning the position of the valve body 59 to the original position when the power is cut off.

  The main valve portion 50 includes a long box-shaped body 51 made of a non-magnetic material (made of a synthetic resin material), and the body 51 has a through hole 51a extending from one end to the other end in the longitudinal direction. ing. A supply port 52, an output port 53, and a discharge port 54 are formed on one side surface of the body 51 from one end to the other end in the longitudinal direction of the body 51 in this order. One end thereof is opened toward the through hole 51a.

  The other end of the supply port 52 is connected to a concentrated air supply flow path 14 formed in the manifold base 13 so that positive pressure air is supplied from a positive pressure supply source (not shown). An output flow path 15 </ b> A formed in the manifold base 13 is connected to the other end of the output port 53. The output port 53 may supply positive pressure air to a pneumatic device such as an air cylinder (not shown), and the output port 53 may be supplied with exhaust from the pneumatic device. Further, the concentrated exhaust passage 16 formed in the manifold base 13 is connected to the other end of the discharge port 54. The discharge port 54 discharges the exhaust to the outside via the concentrated exhaust flow path 16.

  One end of the through hole 51a is sealed by attaching a cylindrical retainer 55 with a bottom. The retainer 55 includes a bottom 55a that seals one end of the through hole 51a, and an extending portion 55b that extends in a cylindrical shape from the peripheral edge of the bottom 55a. The extending portion 55 b is provided so that the tip thereof extends to the periphery of the opening to the through hole 51 a in the output port 53. In the extending portion 55b, a communication hole 55c is formed at a position where it overlaps with the supply port 52, and the supply port 52 and the retainer 55 communicate with each other via the communication hole 55c.

  Further, a supply valve seat 56 is formed at the distal end of the extending portion 55b so as to surround the through hole 51a. Further, in the body 51, a discharge valve seat 57 is formed on an end surface surrounding the through hole 51 a between the output port 53 and the discharge port 54 so as to face the supply valve seat 56. A valve chamber 58 is defined in a space between the supply valve seat 56 and the discharge valve seat 57 and communicating with the output port 53. A valve body 59 is accommodated in the valve chamber 58, and the valve body 59 can be brought into contact with and separated from the supply valve seat 56 and the discharge valve seat 57. Further, the retainer 55 and the valve chamber 58 communicate with each other.

  The valve body 59 is fitted on the outer peripheral surface of a cylindrical rod 60 inserted into the through hole 51 a and is provided integrally with the rod 60. A projecting portion 60 a projecting outward is formed on one end side of the rod 60, and one end side of the rod 60 is inserted into the retainer 55 so that the projecting portion 60 a is located in the retainer 55. A valve return spring 61 is interposed between the protrusion 60 a and the bottom 55 a of the retainer 55. The valve body 59 is urged in a direction away from the supply valve seat 56 by the spring force of the valve return spring 61.

  Then, as shown in FIG. 6, when the valve body 59 is moved away from the supply valve seat 56 by the spring force of the valve return spring 61, the valve body 59 is seated on the discharge valve seat 57, The output port 53 communicates with the communication hole 55c, the retainer 55, and the valve chamber 58 so that positive pressure air is supplied from the output port 53 to the pneumatic equipment.

  On the other hand, as shown in FIG. 7, when the valve body 59 moves away from the discharge valve seat 57 against the spring force of the valve return spring 61, the valve body 59 is seated on the supply valve seat 56. The output port 53 and the discharge port 54 communicate with each other via the valve chamber 58 and the through hole 51a, and the air discharged from the pneumatic device to the output port 53 is discharged from the discharge port 54.

  Next, as shown in FIGS. 5 to 7, the solenoid unit 70 includes a cylindrical magnetic cover 71 formed of a magnetic material, and one end of the magnetic cover 71 is a self-returning block 81 of the self-returning mechanism 80. It is joined with the other end. An insertion hole 71 a is formed at the other end of the magnetic cover 71. A cylindrical bobbin 72 around which a plurality of coils 72 a are wound is disposed inside the magnetic cover 71.

  A guide ring 73 is provided inside the magnetic cover 71 and closer to the self-recovery mechanism 80 than the bobbin 72, and the other end inner surface of the magnetic cover 71 and the other end surface of the self-recovery block 81 of the self-recovery mechanism 80 are provided. A bobbin 72 and a guide ring 73 are sandwiched between them. In the guide ring 73 and the bobbin 72, a substantially cylindrical shape and a movable iron core 74 made of a magnetic material are inserted. One end side of the movable iron core 74 extends so as to enter the other end side of the through hole 51 a of the main valve portion 50 through the through hole 81 a of the self-returning block 81, and one end surface of the movable iron core 74 is extended to the rod 60. Is in contact with the other end surface. In addition, a flange 74a that protrudes outward is formed at one end of the movable iron core 74, and an iron core return spring 75 is interposed between the guide ring 73 and the flange 74a. The movable iron core 74 is biased in the direction in which the rod 60 is pressed by the spring force of the iron core return spring 75. Further, in the movable iron core 74, a recess 74b that is recessed over the entire circumference in the circumferential direction of the movable iron core 74 is formed on one end side of the movable iron core 74 relative to the flange portion 74a. Further, a taper 74d as a slidable contact portion is formed on one end side of the movable iron core 74 relative to the concave portion 74b of the movable iron core 74 so that the concave portion 74b side has a smaller diameter.

  The bobbin 72 has a substantially cylindrical shape and a magnetic fixed iron core 76 inserted therein. That is, the fixed iron core 76 has the coil 72 a wound around the bobbin 72. One end surface of the fixed iron core 76 is a magnetic pole surface, and this magnetic pole surface is disposed so as to face the other end surface of the movable iron core 74. Therefore, the movable iron core 74 and the fixed iron core 76 are arranged coaxially.

  Near the other end of the fixed core 76 in the axial direction, a recess 76a having a smaller diameter than both ends of the fixed core 76 in the axial direction is formed. The recess 76 a is formed so as to be recessed over the entire circumference of the fixed iron core 76 in the circumferential direction. A permanent magnet 77 is disposed in the recess 76 a of the fixed iron core 76.

  When the coil 72a is energized in the forward direction by energizing the attraction side signal line (not shown) and the coil 72a is excited, it passes through the fixed iron core 76, the guide ring 73 and the magnetic cover 71 around the coil 72a. A magnetic circuit is formed. In this case, as shown in FIG. 6, when the coil 72a is energized in the forward direction, the exciting action of the coil 72a acts on the attracting direction, and the exciting action of the coil 72a and the attractive force of the permanent magnet 77 are reduced. The movable iron core 74 is attracted and moved toward the fixed iron core 76 against the spring force of the iron core return spring 75, and the movable iron core 74 comes into contact with the fixed iron core 76. As a result, the valve body 59 is seated on the discharge valve seat 57, and the supply port 52 and the output port 53 communicate with each other via the valve chamber 58.

  On the other hand, when the coil 72a is energized in the reverse direction by energizing the detachment side signal line (not shown), the fixed iron core 76, the guide ring 73 and the magnetic cover 71 are placed around the coil 72a. A passing magnetic circuit is formed. In this case, as shown in FIG. 7, when the coil 72a is energized in the reverse direction, the exciting action of the coil 72a works in the direction of separation. The exciting action of the coil 72 a and the repulsive force of the permanent magnet 77 are applied to the spring force of the iron core return spring 75, and the movable iron core 74 is repelled and moved toward the rod 60, so that the movable iron core 74 contacts the fixed iron core 76. It will be in the state which presses the other end side of the rod 60, without contacting. As a result, the valve body 59 is seated on the supply valve seat 56, and the output port 53 and the discharge port 54 communicate with each other via the valve chamber 58.

  In addition, when the energization to the coil 72 a is stopped and the coil 72 a is not excited, the magnetic circuit is not formed and the attractive force due to the exciting action of the coil 72 a disappears, but the permanent magnet 77 is arranged so as to sandwich the fixed iron core 76. It is installed. For this reason, a part of the magnetic flux generated from the permanent magnet 77 passes through the fixed iron core 76 and is magnetically saturated. Therefore, the magnetic circuit is maintained by a magnetic flux other than the magnetic flux passing through the fixed iron core 76, and the state in which the movable iron core 74 is attracted to the fixed iron core 76 is maintained by this magnetic circuit.

  As described above, the self-holding solenoid valve 12A according to the present embodiment does not connect the output port 53 and the discharge port 54, but allows the supply port 52 and the output port 53 to communicate with each other when the suction side signal line is energized. Thus, the supply port 52 and the output port 53 are not communicated with each other, and the output port 53 and the discharge port 54 are communicated with each other when the separation-side signal line is energized. The self-holding solenoid valve 12A holds the state of each port when not energized. Therefore, the self-holding solenoid valve 12A needs to be in an energized state when switching between a state in which the supply port 22 and the output port 23 are communicated and a state in which the output port 23 and the discharge port 24 are in communication. When maintaining the other states, the non-energized state can be established without maintaining the energized state.

  In addition, since the power is not supplied when the power is cut off, a general self-holding solenoid valve is a solenoid valve that maintains the state before the power cut and cannot return to its original position. Note that the self-holding solenoid valve 12A in the present embodiment is also a solenoid valve that cannot automatically return itself with the self-holding solenoid valve 12A alone. It is an electromagnetic valve that drives the self-return mechanism 80 by supplying positive pressure air from the valve 11. As a result, even when the power is interrupted, the valve body 26 can be returned to the original position and returned so that the supply port 22 and the output port 23 communicate with each other.

  As shown in FIG. 8A, the self-return mechanism 80 is a mechanism for moving the movable iron core 74 to a disengagement position where the movable iron core 74 is detached from the fixed iron core 76, and particularly when the self-holding solenoid valve 12A is not energized. The movable iron core 74 is physically moved to the separation position.

  The self-returning mechanism 80 includes a self-returning block 81 made of a non-magnetic material (made of a synthetic resin material), and the self-returning block 81 has a through hole 81a extending from one end to the other end of the movable iron core 74 in the axial direction. Is formed. The other end of the body 51 in the main valve unit 50 is connected to one end of the self-return block 81, and the other end of the magnetic cover 71 and the guide ring 73 in the solenoid unit 70 is connected to the other end of the self-return block 81. ing. A movable iron core 74 is passed through the through hole 81 a of the self-returning block 81.

  Further, the self-return block 81 is formed with a first piston chamber 82 as a storage portion and a second piston chamber 86 as a second storage portion so as to communicate with the through hole 81a. The first piston chamber 82 and the second piston chamber 86 are formed so as to extend in an orthogonal direction orthogonal to the axial direction of the movable core 74 and to open toward the movable core 74. In addition, protrusions 81b and 81c are formed between the through hole 81a and the first piston chamber 82, and between the through hole 81a and the second piston chamber 86, respectively.

  Next, a first piston 83 extending so as to be orthogonal to the movable iron core 74 is accommodated in the first piston chamber 82. One end side of the first piston 83 as a return member is opposed to the outer periphery of the movable iron core 74, and a taper 83a is formed so that the one end side becomes thinner. The taper 83a is formed on the body 51 side. In particular, when the movable iron core 74 is disposed at an adsorption position where the movable iron core 74 contacts the fixed iron core 76, the first piston 83 is disposed so that the taper 83a of the first piston 83 is in sliding contact with the taper 74d of the movable iron core 74. ing. On the other hand, when the movable iron core 74 is disposed at the disengagement position where it does not contact the fixed iron core 76, the first piston 83 is configured so that one end of the first piston 83 does not slide in contact with the recess 74b of the movable iron core 74. Is arranged.

  A projecting portion 83 b that projects outward is formed on the other end side of the first piston 83. A piston return spring 84 as an urging member is interposed between the inner wall 81d of the protrusion 81b that forms the first piston chamber 82 and the protrusion 83b of the first piston 83. For this reason, at the normal time, the first piston 83 is biased in a direction away from the movable iron core 74 by the spring force of the piston return spring 84.

  In the first piston chamber 82, the output flow path 18 formed in the manifold base 13 is connected to the other end side of the first piston 83. Positive pressure air from the direct acting three-port solenoid valve 11 is supplied to the first piston chamber 82 via the output flow path 18. A concave portion 83c is formed on the side surface of the first piston 83, and an O-ring O1 is provided. For this reason, the positive pressure air supplied to the 1st piston chamber 82 from the output flow path 18 is not supplied to the movable iron core 74 side rather than the O-ring O1. For this reason, when positive pressure air is supplied from the output flow path 18 to the first piston chamber 82, it moves toward the movable iron core 74 against the spring force of the piston return spring 84, as shown in FIG. To do. For this reason, when the movable iron core 74 is disposed at the adsorption position, the taper 83a of the first piston 83 is in sliding contact with the taper 74d of the movable iron core 74 and pressed so as not to come into sliding contact with the fixed iron core 76. The movable iron core 74 is moved to one end, and one end of the first piston 83 is accommodated in the recess 74b. When the movable iron core 74 is disposed at the disengagement position from the beginning, the taper 83a of the first piston 83 is not slidably contacted with the taper 74d of the movable iron core 74, and one end of the first piston 83 is stored in the recess 74b. Is done. Thus, the 1st piston 83 presses the taper 74d of the movable iron core 74, and can be accommodated in the recessed part 74b. When the supply of positive pressure air to the first piston chamber 82 is stopped, the first piston is moved away from the movable iron core 74 by the spring force of the piston return spring 84 as shown in FIG. 83 moves. In the present embodiment, the position where the first piston 83 does not slide on the movable iron core 74 corresponds to the first position, and the position where the first piston 83 slides on the movable iron core 74 corresponds to the second position.

  In the present embodiment, a power supply voltage is supplied from the same power supply (not shown) to each of the plurality of solenoid valves 11, 12A to 12D. For this reason, when the power supply voltage from the power supply device is not supplied, such as when the power supply device fails, all of the plurality of solenoid valves 11, 12A to 12D are disconnected. Therefore, when the power supply device is broken, for example, when the self-holding solenoid valves 12A to 12D are cut off and the coil 72a is de-energized, there is no need to provide a special element for monitoring (detecting) the interruption. Similarly, the direct acting three-port solenoid valve 11 is also disconnected, and positive pressure air is supplied to the first piston chamber 82.

  In the self-returning block 81, a press-fit groove 81f is formed on the solenoid part 70 side of the first piston chamber 82, and one end of a press-fit plate 85 is press-fitted into the press-fit groove 81f. The press-fitting groove 81 f has a shape slightly longer than the length of the press-fit plate 85 and slightly thicker than the thickness of the press-fit plate 85. Further, on the other end side of the first piston 83, a slide groove 83d slightly longer than the press-fit plate 85 and slightly thicker than the press-fit plate 85 is formed on the solenoid unit 70 side. As a result, the press-fit plate 85 allows the first piston 83 to move in the direction perpendicular to the movable iron core 74 and prevents the first piston 83 from dropping off toward the manifold base 13.

  The second piston chamber 86 accommodates a second piston 87 extending so as to be orthogonal to the movable iron core 74. One end side of the second piston 87 as the second return member faces the outer periphery of the movable iron core 74, and a taper 87a is formed so that the one end side becomes narrow. The taper 87a is formed on the body 51 side. In particular, when the movable iron core 74 is arranged at an adsorption position where it comes into contact with the fixed iron core 76, the second piston 87 is arranged so that the taper 87a of the second piston 87 is in sliding contact with the taper 74d of the movable iron core 74. ing. On the other hand, when the movable iron core 74 is disposed at a disengagement position where it does not contact the fixed iron core 76, the second piston 87 is prevented from slidingly contacting one end of the second piston 87 with the recess 74b of the movable iron core 74. Is arranged.

  A projecting portion 87 b that projects outward is formed on the other end side of the second piston 87. A piston return spring 88 is interposed between the inner wall 81e of the protruding portion 81c forming the second piston chamber 86 and the protruding portion 87b of the second piston 87. For this reason, at the normal time, the second piston 87 is biased in a direction away from the movable iron core 74 by the spring force of the piston return spring 88.

On the other end surface side of the second piston 87, an operation button 89 is disposed as an operation portion that is exposed from the self-returning block 81 and can be pressed by the operator. When the operation button 89 is pressed toward the movable iron core 74, the operation button 89 moves toward the movable iron core 74 against the spring force of the piston return spring 88, as shown in FIG. For this reason, when the movable iron core 74 is disposed at the adsorption position, the taper 87a of the second piston 87 is in sliding contact with the taper 74d of the movable iron core 74 and pressed so that it is not in sliding contact with the fixed iron core 76. The movable iron core 74 moves, and one end of the second piston 87 is accommodated in the recess 74b. When the movable iron core 74 is disposed at the disengagement position from the beginning, the taper 87a of the second piston 87 is not slidably contacted with the taper 74d of the movable iron core 74, and one end of the second piston 87 is stored in the recess 74b. Is done. When the pressing operation of the operation button 89 is completed, the second piston 87 and the operation button 89 are moved away from the movable iron core 74 by the spring force of the piston return spring 88 as shown in FIG. The operation button 89 moves. In the present embodiment, the position where the second piston 87 does not slide on the movable core 74 corresponds to the third position, and the position where the second piston 87 slides on the movable core 74 corresponds to the fourth position.
[Action]
Next, the operation of the solenoid valve manifold 10 will be described.

  In the solenoid valve manifold 10, in the self-holding solenoid valve 12 </ b> A, as shown in FIG. 6, the coil 72 a is energized in the forward direction by energizing the adsorption-side signal line, and the exciting action of the coil 72 a and the attractive force of the permanent magnet 77. As a result, the movable iron core 74 is attracted and moved to the fixed iron core 76 side. The valve body 59 is seated on the discharge valve seat 57, and the supply port 52 and the output port 53 communicate with each other via the valve chamber 58.

  On the other hand, as shown in FIG. 7, the coil 72 a is energized in the reverse direction by energizing the separation side signal line, and the movable iron core 74 is repelled toward the rod 60 by the exciting action of the coil 72 a and the repulsive force of the permanent magnet 77. To be moved. The valve body 59 is seated on the supply valve seat 56, and the output port 53 and the discharge port 54 communicate with each other via the valve chamber 58.

  Further, when the energization to the coil 72 a is stopped, the coil 72 a is not excited and the attractive force and the repulsive force due to the exciting action of the coil 72 a disappear, but the fixed iron core 76 is one of the magnetic fluxes generated from the permanent magnet 77. The portion passes and becomes magnetically saturated, and the state before the energization of the coil 72a is stopped is maintained.

  Next, in the direct acting three-port solenoid valve 11, as shown in FIG. 4, when the coil 42 a is energized, the exciting action of the coil 42 a resists the spring force of the iron core return spring 45 and the movable iron core 44 is moved. The valve body 26 is seated on the supply valve seat 27, and the output port 23 and the discharge port 24 communicate with each other via the valve chamber 25.

  On the other hand, as shown in FIG. 3, when the coil 42 a is not energized, the movable core 44 moves to the body 21 side by the spring force of the core return spring 45, and the valve body 26 is seated on the discharge valve seat 28. The supply port 22 and the output port 23 communicate with each other through the valve chamber 25. As a result, the direct acting three-port solenoid valve 11 supplies positive pressure air to the self-holding solenoid valve 12A when not energized. In particular, when the electromagnetic valves 11 and 12A to 12D are cut off, the electromagnetic valves 11 and 12A to 12D are de-energized to the coils 42a and 72a. Positive pressure air is supplied to the self-holding solenoid valve 12A.

  In the self-holding solenoid valve 12 </ b> A, positive pressure air from the direct acting three-port solenoid valve 11 is supplied to the first piston chamber 82 via the output flow path 18 when power is interrupted. In the first piston chamber 82, the first piston 83 is pressed from the other end side to the one end side by supplying positive pressure air, and is movable against the spring force of the piston return spring 84, as shown in FIG. It moves toward the iron core 74 side. And when the movable iron core 74 is arrange | positioned in the adsorption | suction position, the 1st piston 83 moves to the movable iron core 74 side, and the taper 83a of the 1st piston 83 is slidably contacted with the taper 74d of the movable iron core 74, The movable iron core 74 is moved to the separation position.

  On the other hand, during energization, positive pressure air from the direct acting three-port solenoid valve 11 is not supplied to the first piston chamber 82. For this reason, the first piston 83 moves in a direction away from the movable iron core 74 by the spring force of the piston return spring 84.

  In the self-holding solenoid valve 12A, the second piston 87 is moved from the other end side to the one end side when the operation button 89 is pressed regardless of whether it is energized or not. 8c, and moves toward the movable core 74 against the spring force of the piston return spring 88, as shown in FIG. And when the movable iron core 74 is arrange | positioned in the adsorption | suction position, the 2nd piston 87 moves to the movable iron core 74 side, and the taper 87a of the 2nd piston 87 is slidably contacted with the taper 74d of the movable iron core 74, The movable iron core 74 is moved to the separation position. On the other hand, when the pressing operation of the operation button 89 is not performed, the second piston 87 is moved away from the movable iron core 74 by the spring force of the piston return spring 88.

According to the above embodiment, the following effects can be obtained.
(1) The plurality of solenoid valves 12A to 12D are
A permanent magnet 77 is provided for maintaining the state in which the movable iron core 74 is attracted to the fixed iron core 76. The plurality of solenoid valves 12 </ b> A to 12 </ b> D have a first piston 83 that can be displaced between a first position that does not interfere with the displacement of the movable core 74 and a second position that returns the movable core 74 to the original position. And when each electromagnetic valve 11, 12A-12D becomes a power interruption, the 1st piston 83 will be 1st position by the air from the direct acting type 3 port electromagnetic valve 11 being supplied to the 1st piston chamber 82. To the second position. For this reason, even if the self-holding solenoid valves 12A to 12D with low power consumption and low heat dissipation are used, when the power is cut off, positive pressure air is supplied to the first piston chamber 82. It can be displaced to the separation position which is the original position. Therefore, power consumption can be reduced, heat dissipation can be reduced, and the arrangement of the valve body 26 can be returned to the original position even when the power is interrupted.

  (2) Conventionally, it is considered that a self-return mechanism for self-returning the valve body to its original position is mounted for each solenoid valve. However, by mounting each solenoid valve, the size of the apparatus is increased and the manufacturing process is increased. There was a risk of inviting. Thus, with the configuration of the present embodiment, by using the direct acting three-port solenoid valve 11, positive pressure air can be intensively supplied to the plurality of self-holding solenoid valves 12A to 12D. Further, it is sufficient that at least one direct acting three-port solenoid valve 11 is provided for the plurality of self-holding solenoid valves 12A to 12D, and the solenoid valve device can be reduced in size, and the manufacturing process can be achieved. Can be suppressed. Furthermore, the self-holding solenoid valves 12A to 12D tend to have lower power consumption and less heat dissipation than the direct acting three-port solenoid valve 11. For this reason, if it comprises so that one direct acting 3 port solenoid valve 11 may be provided with respect to several self-holding type solenoid valves 12A-12D, it will consume rather than comprising several direct acting 3 port solenoid valves. Less power and less heat dissipation.

  (3) Further, a taper 83 a is formed at one end of the first piston 83 that faces the movable iron core 74. When the first piston 83 is displaced from the first position to the second position, the movable core 74 can be moved to the disengaged position by the taper 83a slidingly contacting the taper 74d of the movable core 74. For this reason, even when the first piston 83 is displaced so as to be orthogonal to the axis of the movable iron core 74, the movable iron core 74 can be smoothly displaced to the original position.

  (4) A piston return spring 84 that urges the first piston 83 from the second position to the first position is provided. Therefore, when positive pressure air is not supplied from the direct acting three-port solenoid valve 11, the piston return spring 84 can displace the first piston 83 from the second position to the first position by the spring force. .

  (5) The second piston 87 can be displaced between a third position where the displacement of the movable iron core 74 does not interfere with the fourth position where the movable iron core 74 is returned to the original position in accordance with the operation of the operation button 89. is there. In the second piston 87, a taper 87 a is formed at one end facing the movable iron core 74. When the second piston 87 is displaced from the third position to the fourth position, the movable core 74 can be moved to the disengaged position by the taper 87a slidingly contacting the taper 74d of the movable core 74. For this reason, the movable iron core 74 can be displaced to the disengagement position not only by supplying positive pressure air from the direct acting three-port solenoid valve 11 but also by an operator's pressing operation. Therefore, power consumption can be reduced, heat dissipation can be reduced, and the arrangement of the valve body 26 can be returned to the original position in accordance with the operation of the operation button 89. Further, even when the second piston 87 is displaced so as to be orthogonal to the axis of the movable iron core 74, the movable iron core 74 can be smoothly displaced to the original position. Furthermore, like the first piston 83, the second piston 87 is in sliding contact with the taper 74d formed on the entire circumference of the movable iron core 74, thereby corresponding to each of the first piston 83 and the second piston 87. Therefore, it is not necessary to form the different taper 74d, and the number of manufacturing steps can be reduced. Further, the first piston 83 and the second piston 87 are disposed so as to face each other with the movable iron core 74 interposed therebetween. Therefore, the first piston 83 and the second piston 87 are in sliding contact with the movable iron core 74 on the same axis, and the movable iron core 74 is more stabilized than when the movable iron core 74 is in sliding contact from different axes. Can do.

In addition, you may change the said embodiment as follows.
In the above embodiment, the direct-acting three-port solenoid valve 11 and the plurality of self-holding solenoid valves 12A to 12D do not have to supply power from the same power supply device. In this case, for example, a monitoring unit that monitors when the power is cut off is mounted on each of the plurality of self-holding solenoid valves 12A to 12D, and when the power is cut off, the direct acting 3-port solenoid valve 11 is cut off. What is necessary is just to comprise so that the time of an electric power interruption etc. can be specified with the direct acting type 3 port solenoid valve 11 by supplying a signal. With this configuration, when the power failure or the like is specified by the direct acting three-port solenoid valve 11, positive pressure air is supplied to the first piston chamber 82, and the valve body 26 is returned to the original position. Can do.

  In the above embodiment, a normally closed type direct acting three-port solenoid valve is adopted, and positive pressure air is supplied to the first piston chamber 82 when energized, and positive pressure air is supplied to the first piston chamber 82 when not energized. You may comprise so that it may not. In this case, it is necessary that the first piston chamber 82 is arranged at the first position when positive pressure air is supplied, and is displaced to the second position when positive pressure air is not supplied.

In the above embodiment, the original position may be the suction position, and the taper 87a of the first piston 83 may be formed on the solenoid unit 70 side.
In the above embodiment, either one of the movable iron core 74 and each of the pistons 83 and 87 may be tapered, or none of them may be tapered.

  In the above embodiment, the pistons 83 and 87 may be displaced in a direction that is not orthogonal to the axial direction of the movable iron core 74. As a specific example, the pistons 83 and 87 may be displaced in the axial direction of the movable iron core 74.

  In the above embodiment, the self-return mechanism 80 is configured only for the first piston 83 and may not be configured for the second piston 87. That is, the valve body 26 does not have to return to the original position in accordance with the operation of the operator.

  In the above embodiment, the direct-acting three-port solenoid valve 11 and the self-holding solenoid valves 12A to 12D may have the same supply flow path and the same exhaust flow path. Moreover, these combinations may be sufficient.

  In the above embodiment, a plurality of direct acting three-port solenoid valves 11 may be mounted on the plurality of self-holding solenoid valves 12A to 12D. One direct acting three-port solenoid valve 11 may be mounted on one self-holding solenoid valve.

  In the above embodiment, a device other than the direct acting three-port solenoid valve 11 may be employed as an air supply device that supplies positive pressure air to the first piston chamber 82. For example, a direct acting balance poppet solenoid valve may be employed. Further, the electromagnetic valve device in the claims does not matter whether there are a plurality of electromagnetic valves or one, regardless of whether or not such an air supply device is provided.

In the above embodiment, there is no problem even if simple air is supplied to the first piston chamber 82.
In the above embodiment, there is no problem even if the self-holding solenoid valves 12A to 12D are configured to simply output air. Moreover, what is necessary is just a structure provided with the valve body which switches a flow path even if it is not air.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) A fixed iron core around which a coil is wound, a disengagement position that is arranged coaxially with the fixed iron core, and is separated from the fixed iron core according to the energization state of the coil, and an adsorption position that is adsorbed to the fixed iron core And a permanent magnet for maintaining a state in which the movable iron core is attracted to the fixed iron core, the original position being one of the separation position and the attracting position. , A valve body that switches a flow path according to the displacement of the movable core, and is displaceable between a first position that does not interfere with the displacement of the movable core and a second position that returns the movable core to the original position. A return member, a storage portion in which the return member is disposed, air can be supplied to the storage portion, and the plurality of solenoid valves in the plurality of electromagnetic valves can be switched by switching the presence or absence of air supply when power is interrupted. The return member is An electromagnetic valve device having an air supply device that is displaced from one position to the second position.

  DESCRIPTION OF SYMBOLS 10 ... Solenoid valve manifold, 11 ... Direct acting 3 port solenoid valve, 12A-12D ... Self-holding type solenoid valve, 13 ... Manifold base, 14 ... Concentrated air supply flow path, 15A-15D, 18 ... Output flow path, 16 ... Centralized exhaust flow path, 17 ... Air supply flow path, 19 ... Exhaust flow path, 20, 50 ... Main valve section, 22,52 ... Supply port, 23,53 ... Output port, 24,54 ... Exhaust port, 25,58 ... Valve chamber, 26, 59 ... Valve body, 27, 56 ... Supply valve seat, 28, 57 ... Discharge valve seat, 30, 61 ... Valve return spring, 40, 70 ... Solenoid part, 42, 72 ... Bobbin, 42a, 72a ... Coil, 44, 74 ... Movable iron core, 46, 76 ... Fixed iron core, 74b ... Recess, 74d, 83a, 87a ... Taper, 45, 75 ... Iron core return spring, 77 ... Permanent magnet, 80 ... Self-reset mechanism, 81 ... Self-recovery block, 82 ... 1 the piston chamber, 83 ... first piston, 84, 88 ... piston return spring, 86 ... second piston chamber, 87 ... second piston, 89 ... operation button.

Claims (4)

A fixed iron core around which a coil is wound,
It is disposed coaxially with the fixed iron core, and is displaceable between a separation position where the coil is separated from the fixed iron core and an adsorption position where the coil is attracted to the fixed iron core, depending on the energization state of the coil. A movable iron core whose original position is one of the adsorption positions;
A permanent magnet for holding a state in which the movable iron core is attracted or repelled with respect to the fixed iron core;
A valve body for switching the flow path according to the displacement of the movable iron core,
A return member displaceable between a first position that does not interfere with displacement of the movable core and a second position that returns the movable core to the original position;
A plurality of solenoid valves having a storage portion in which the return member is disposed ;
One air supply equipment for displacing the second position the return member in the plurality of solenoid valves by switching the presence or absence of supply of air from the first position when a power interruption,
A solenoid valve device comprising: a manifold base formed with an output flow path for branching and supplying air supplied from the one air supply device to each of the storage portions of the plurality of solenoid valves . The return member is displaced between the first position and the second position along a direction orthogonal to the axis of the movable core.
One end of the return member facing the movable iron core is tapered toward the movable iron core,
The movable iron core, when said return member is displaced to said second position from said first position, wherein the return member according to claim wherein the taper is formed sliding contact portion in sliding contact is formed in 1 Solenoid valve device. The solenoid valve device according to claim 1, further comprising a biasing member that biases the return member from the second position to the first position. An operation unit that can be operated by an operator,
A second return that is separate from the return member and is displaceable between a third position that does not interfere with the displacement of the movable core and a fourth position that displaces the movable core to the disengagement position or the suction position. Members,
The sliding contact portion is formed with respect to the entire circumference of the movable iron core,
The second return member is displaced between the third position and the fourth position along a direction orthogonal to the axis of the movable core.
3. The solenoid valve device according to claim 2 , wherein a second taper is formed at one end of the second return member facing the movable iron core toward the movable iron core.