JP6576674B2 - solenoid valve - Google Patents

Description

  The present invention relates to a solenoid valve.

  For example, Patent Document 1 discloses a latch-type electromagnetic valve including a permanent magnet.

JP 2002-250457 A

  In a solenoid valve having a permanent magnet as described above, if foreign matter such as iron powder adheres to the permanent magnet or a magnetic material excited by the permanent magnet, there is a risk of malfunction. Therefore, it is preferable to suppress the adhesion of foreign matter to the permanent magnet or the like by providing a seal member. However, when the seal member is provided, there is a problem that the solenoid valve is enlarged.

  In view of the above problems, an aspect of the present invention is to provide an electromagnetic valve having a structure capable of suppressing adhesion of foreign matter to a permanent magnet or the like while suppressing an increase in size. .

One aspect of the electromagnetic valve according to the present invention includes a solenoid having a cylindrical guide portion centering on a central axis extending in the axial direction, a magnetic body portion, and a radially inner side of the guide portion in the axial direction. A moving mover, a cover that accommodates the solenoid and the mover, has a hole, and is located in the hole, and the end on the other axial side contacts the one axial side of the mover. A pin that moves as the mover moves, a cylindrical pin guide member that holds the pin movably in the axial direction, and is supported by the cover, and a valve body that opens and closes a fluid passage. A valve portion that is provided outside the cover and that is opened and closed by contacting an end of the pin on one axial side of the pin with the valve body as the pin moves in the axial direction; It is arranged inside and faces the mover in the axial direction And a permanent magnet that forms a magnetic circuit passing through the core, the mover, and the cover. It has a cylindrical part made of a magnetic material that surrounds the outside in the radial direction, and the entire core is covered with the cover from the other axial side, and the movable element penetrates the movable element in the axial direction. A through hole is provided.
One aspect of the electromagnetic valve according to the present invention includes a solenoid having a cylindrical guide portion centering on a central axis extending in the axial direction, a magnetic body portion, and a radially inner side of the guide portion in the axial direction. A mover that moves, a cover that accommodates the solenoid and the mover, has a hole, a pin that is located in the hole and moves as the mover moves, and holds the pin movably. A cylindrical pin guide member supported by the cover; and a valve portion provided outside the cover and opened and closed along with the movement of the mover and the pin, the cover having a diameter of the solenoid It has a cylindrical part made of a magnetic material that surrounds the outer side in the direction, and the movable element is provided with a through hole that penetrates the movable element in the axial direction.

  According to one aspect of the present invention, there is provided an electromagnetic valve having a structure capable of suppressing adhesion of foreign matter to a permanent magnet or the like while suppressing an increase in size.

FIG. 1 is a cross-sectional view showing the electromagnetic valve of the present embodiment. FIG. 2 is a cross-sectional view showing the electromagnetic valve of the present embodiment.

  Hereinafter, an electromagnetic valve according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the following drawings, the scale and number of each structure may be different from the scale and number of the actual structure in order to make each configuration easy to understand.

  In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG. The Y-axis direction is one direction orthogonal to the Z-axis direction, that is, the left-right direction in FIG. The X-axis direction is a direction orthogonal to both the Z-axis direction and the Y-axis direction.

  In the following description, the positive side in the Z-axis direction (+ Z side, one side in the axial direction) is referred to as “upper side”, and the negative side in the Z-axis direction (−Z side, the other side in the axial direction) is referred to as “ Called “lower side”. The upper side and the lower side are simply names used for explanation, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as an “axial direction”, and a radial direction around the central axis J is simply referred to as a “radial direction”. The circumferential direction centered on is simply referred to as the “circumferential direction”.

  FIG.1 and FIG.2 is sectional drawing which shows the solenoid valve 10 of this embodiment. FIG. 1 shows a state in which the valve unit 60 is opened. FIG. 2 shows a state in which the valve unit 60 is closed. The solenoid valve 10 of the present embodiment is a self-holding solenoid valve that can hold each of the open / closed states of the valve unit 60 without supplying current, for example.

  As shown in FIGS. 1 and 2, the electromagnetic valve 10 of the present embodiment includes a cover 40, a pin guide member 31, a solenoid 20, a mold 80, a mover 50, a core 21, a spring 100, A permanent magnet 90, a valve unit 60, and a pin 70 are provided. When current is supplied to the solenoid 20, thrust by magnetic force is given to the mover 50, and the mover 50 moves. The pin 70 moves as the mover 50 moves. The valve unit 60 is opened and closed as the mover 50 and the pin 70 move. Hereinafter, the configuration of each unit will be described in detail.

[cover]
The cover 40 accommodates the solenoid 20 and the mover 50. The cover 40 includes a cylindrical portion 43, an upper plate (first plate) 41, and a lower plate (second plate) 42. The cylindrical portion 43 has a cylindrical shape that surrounds the radially outer side of the solenoid 20. In the present embodiment, the cylindrical portion 43 is, for example, a cylindrical shape concentric with the central axis J. The cylindrical portion 43 is made of a magnetic material.

  The upper plate 41 is located on the upper side (+ Z side) of the solenoid 20. The upper plate 41 is attached to the cylindrical portion 43. In the present embodiment, the upper plate 41 is fitted inside the tubular portion 43, for example. The upper plate 41 is made of a magnetic material.

  In the present embodiment, the upper plate 41 is composed of, for example, two plates. That is, the upper plate 41 includes a first upper plate 41a and a second upper plate 41b. The first upper plate 41a is overlaid on the upper side (+ Z side) of the second upper plate 41b. Although illustration is omitted, the shape of the first upper plate 41a and the shape of the second upper plate 41b viewed from the axial direction (Z-axis direction) are, for example, circular.

  The first upper plate 41a is provided with a first hole portion 41c that penetrates the first upper plate 41a in the axial direction (Z-axis direction). The second upper plate 41b is provided with a second hole portion 41d penetrating the second upper plate 41b in the axial direction. The first hole portion 41c and the second hole portion 41d constitute a hole portion 41e that penetrates the upper plate 41 in the axial direction. That is, the cover 40 has a hole 41e. The first hole 41c and the second hole 41d are, for example, circular, and the central axis J passes through the center of the first hole 41c and the center of the second hole 41d. The diameter of the second hole 41d is smaller than the diameter of the first hole 41c.

  On the lower surface of the second upper plate 41b, a fixed recess 41f that is recessed upward (+ Z side) is provided. The fixed recess 41f has a retaining portion 41g whose radial dimension increases toward the upper side.

  The lower plate 42 is located on the lower side (−Z side) of the solenoid 20. The lower plate 42 is attached to the cylindrical portion 43. In the present embodiment, the lower plate 42 is fitted inside the cylindrical portion 43, for example. The lower plate 42 supports the permanent magnet 90 and the core 21 from the lower side (−Z side). The lower surface of the lower plate 42 is supported by the lower end portion of the tubular portion 43 that is bent inward in the radial direction. Although illustration is omitted, the shape of the lower plate 42 viewed from the axial direction (Z-axis direction) is, for example, a circular shape. The lower plate 42 is made of a nonmagnetic material.

  According to the present embodiment, the upper plate 41, the lower plate 42, and the cylindrical portion 43 that constitute the cover 40 are separate members. Therefore, when assembling the solenoid valve 10, the solenoid 20 and the mover 50 can be easily accommodated inside the cover 40. Thereby, the assembly of the solenoid valve 10 can be facilitated.

[Pin guide member]
The pin guide member 31 is a cylindrical member supported by the cover 40. The pin guide member 31 is made of a nonmagnetic material. The pin guide member 31 is fitted in the first hole 41c of the first upper plate 41a. The lower end of the pin guide member 31 is in contact with the upper surface of the second upper plate 41b.

  The pin guide member 31 has, for example, a cylindrical shape that opens at both ends in the axial direction (Z-axis direction) and that has the central axis J as the center. That is, in this embodiment, the pin guide member 31 extends in the axial direction. A pin 70 is inserted inside the pin guide member 31. The pin guide member 31 holds the pin 70 so as to be movable. In this embodiment, since the pin guide member 31 extends in the axial direction, the pin 70 moves in the axial direction. Thereby, by arranging the mover 50 and the pin 70 along the axial direction, the pin 70 can be easily moved by the movement of the mover 50.

[solenoid]
The solenoid 20 is located inside the cylindrical portion 43 in the radial direction. The solenoid 20 includes an insulator 22, a coil 23, and a guide bush (guide portion) 30.

  The insulator 22 is made of resin, for example. The insulator 22 has a bobbin portion 24 and a convex portion 25. The bobbin portion 24 has a cylindrical shape surrounding the radially outer side of the central axis J. In this embodiment, the bobbin part 24 is cylindrical shape centering on the central axis J, for example. The convex portion 25 projects radially inward from the inner peripheral surface of the bobbin portion 24.

  The coil 23 is wound around the bobbin portion 24. That is, the coil 23 is configured by winding a conductive wire around the central axis J. The coil 23 excites the core 21.

  The guide bush 30 is cylindrical with a central axis J extending in the axial direction (Z-axis direction). The guide bush 30 is, for example, cylindrical. The guide bush 30 is made of a nonmagnetic material. The guide bush 30 is fitted inside the bobbin portion 24.

  The guide bush 30 is located on the upper side (+ Z side) of the convex portion 25. The lower end of the guide bush 30 is in contact with the upper end of the convex portion 25. The upper end of the guide bush 30 is in contact with the second upper plate 41b. As a result, the guide bush 30 is positioned in the axial direction (Z-axis direction). The inner peripheral surface of the guide bush 30 and the radially inner end surface of the convex portion 25 are at the same position in the radial direction.

[mold]
The mold 80 includes a mold main body portion 83 and a connector portion 81. The mold main body 83 is located inside the cover 40. The mold main body 83 covers the coil 23 and the bobbin portion 24. A part of the mold body 83 is located inside the fixed recess 41f. As described above, the fixed recess 41f has the retaining portion 41g. Therefore, a part of the mold main body portion 83 positioned at the retaining portion 41g in the fixing recess 41f is prevented from being detached, and the mold 80 can be prevented from being detached from the upper plate 41.

  The connector part 81 protrudes radially outward from the mold body part 83. The connector part 81 is exposed to the outside of the cover 40. The connector part 81 is provided with a connector opening 81a that opens downward (−Z side). The connector part 81 has a connection terminal 82. One end of the connection terminal 82 protrudes from the bottom surface of the connector opening 81a. Although not shown, the other end of the connection terminal 82 is electrically connected to the coil 23. An external power supply (not shown) is connected to the connector portion 81. The external power supply supplies current to the coil 23 through the connection terminal 82.

[Mover]
The mover 50 is disposed on the radially inner side of the guide bush 30 of the solenoid 20. In this embodiment, the needle | mover 50 is a column shape, for example. The mover 50 moves along the guide bush 30 in the axial direction (Z-axis direction). That is, the mover 50 moves in the axial direction on the radially inner side of the guide bush 30.

  The mover 50 is made of a magnetic material. That is, the mover 50 has a magnetic part. In this embodiment, the mover 50 is a single member, for example. That is, in this embodiment, the magnetic body portion is the entire movable element 50.

  The mover 50 is provided with a through hole 51 that penetrates the mover 50 in the axial direction (Z-axis direction). The through hole 51 extends, for example, linearly in the axial direction. Therefore, air easily passes through the through-hole 51, and pressure fluctuation in the solenoid 20 described later is easily suppressed. Moreover, the process which creates the through-hole 51 in the needle | mover 50 is easy.

  The cross-sectional shape of the through hole 51 is, for example, a circular shape concentric with the central axis J. Therefore, it is easy to make the radial thickness of the mover 50 uniform in the circumferential direction. Thereby, the magnetic force applied to the mover 50 can be easily made uniform in the circumferential direction, and the mover 50 can be prevented from being tilted with respect to the central axis J during movement.

  In the present embodiment, the through hole 51 has a small diameter part 51a and a large diameter part 51b. The diameter D1 of the small diameter part 51a is smaller than the diameter D2 of the large diameter part 51b. The small diameter portion 51a and the large diameter portion 51b are arranged in this order from the upper side (+ Z side) to the lower side (−Z side). In other words, the large-diameter portion 51b is larger in diameter than the small-diameter portion 51a and is located on the core 21 side (−Z side) in the axial direction (Z-axis direction) of the small-diameter portion 51a.

  The through hole 51, more specifically, the small diameter portion 51 a has an opening 50 a that opens to the upper side (+ Z side) of the mover 50. In the present embodiment, the diameter of the opening 50a is the same as the diameter D1 of the small diameter part 51a. When the diameter of the opening 50a with respect to the diameter D4 of the mover 50 is relatively large, the area of the upper surface of the mover 50 facing the upper plate 41 is relatively small. For this reason, the magnetic force between the mover 50 and the upper plate 41 becomes weak, and there is a possibility that a sufficient thrust cannot be applied to the mover 50.

  On the other hand, according to the present embodiment, the diameter of the opening 50a, that is, the diameter D1 of the small diameter part 51a is smaller than the diameter D3 inside the pin guide member 31. Therefore, the diameter of the opening 50a can be made relatively small, and the area of the upper surface of the mover 50 facing the upper plate 41 can be easily secured. Therefore, it is possible to suppress the magnetic force between the mover 50 and the upper plate 41 from being weakened, and it is easy to give a sufficient thrust to the mover 50.

  The diameter of the through-hole 51, that is, the diameter D1 of the small-diameter portion 51a and the diameter D2 of the large-diameter portion 51b in this embodiment is sufficient for air to pass through the inside of the through-hole 51 when the open / close state of the valve portion 60 is switched. It is preferably as large as possible. It is because the fluctuation | variation of the atmospheric pressure in the cover 40 can be suppressed more.

[core]
At least a part of the core 21 is located inside the bobbin portion 24 in the radial direction. That is, at least a part of the core 21 is located on the radially inner side of the coil 23. In the present embodiment, the core 21 has, for example, a cylindrical shape centered on the central axis J. In the present embodiment, the core 21 is fitted inside the bobbin portion 24 in the radial direction.

  The core 21 faces the mover 50 in the axial direction (Z-axis direction). The core 21 is located on the lower side (−Z side) of the mover 50. The outer edge portion of the upper surface of the core 21 is in contact with the lower end of the convex portion 25. The lower surface of the core 21 is in contact with the upper surface of the lower plate 42. Thereby, the core 21 is positioned in the axial direction (Z-axis direction). In this way, the core 21 is fixed inside the cover 40. The core 21 is made of a magnetic material.

[spring]
The spring 100 is located between the axial direction (Z-axis direction) between the core 21 and the mover 50. The spring 100 presses the mover 50 in the direction toward the pin 70 (+ Z direction). At least a part of the spring 100 is located inside the through hole 51 in the radial direction. That is, at least a part of the spring 100 overlaps the mover 50 in the radial direction. Therefore, it is easy to reduce the axial dimension of the solenoid valve 10.

  In the present embodiment, at least a part of the spring 100 is located on the radially inner side of the large diameter portion 51b. Therefore, it is easy to increase the radial dimension of the spring 100 while reducing the diameter D1 of the small diameter portion 51a having the opening 50a. Accordingly, it is possible to ensure the pressing force to the movable element 50 by the spring 100 while ensuring the magnetic force between the upper plate 41 and the movable element 50.

  The lower end of the spring 100 is in contact with the upper surface of the core 21. The upper end of the spring 100 is in contact with the top surface of the large diameter part 51b. As a result, upward (+ Z direction) pressing force can be applied to the mover 50.

[permanent magnet]
The permanent magnet 90 is located on the lower side (−Z side) of the solenoid 20. The upper surface of the permanent magnet 90 is in contact with the lower surface of the mold main body 83. The lower surface of the permanent magnet 90 is in contact with the upper surface of the lower plate 42.

  The permanent magnet 90 has an annular shape, for example. In the present embodiment, the permanent magnet 90 is fitted inside the cover 40. That is, the radially outer surface of the permanent magnet 90 is in contact with the inner peripheral surface 43 a of the cylindrical portion 43. The permanent magnet 90 surrounds the radially outer side of the core 21. In the present embodiment, the permanent magnet 90 is fitted to the core 21. That is, the radially inner surface of the permanent magnet 90 is in contact with the outer peripheral surface of the core 21.

  The permanent magnet 90 has two different magnetic poles along the radial direction. For example, when the magnetic pole arranged radially inward of the permanent magnet 90 is an N pole and the magnetic pole arranged radially outside of the permanent magnet 90 is an S pole, the magnetic flux of the permanent magnet 90 is The permanent magnet 90 is discharged into the core 21 from the radially inner surface. The magnetic flux released into the core 21 proceeds upward (+ Z side) from the core 21 to the upper plate 41 via the mover 50. The magnetic flux that has reached the upper plate 41 travels from the upper plate 41 to the tubular portion 43, and travels through the tubular portion 43 from the upper side to the lower side (−Z side). The magnetic flux emitted from the radially inner surface of the permanent magnet 90 to the core 21 returns to the permanent magnet 90 from the radially outer surface via the cylindrical portion 43.

  Thereby, a magnetic circuit is comprised and the core 21, the mover 50, and the cover 40 which are comprised with a magnetic body are excited. That is, the permanent magnet 90 forms a magnetic circuit that passes through the core 21, the mover 50, and the cover 40. A magnetic force attracting each other is generated between the excited movable element 50 and the upper plate 41. A magnetic force attracting each other is generated between the excited mover 50 and the core 21. Thus, according to this embodiment, since the permanent magnet 90 has two magnetic poles arranged along the radial direction, the magnetic force in the axial direction (Z-axis direction) can be applied to the mover 50, and the movable magnet 50 is movable. This can be used as a thrust for moving the child 50.

  In addition to the thrust generated by the magnetic circuit, an upward pressing force by the spring 100 is applied to the mover 50 as described above. In the state shown in FIG. 1, the magnetic force between the mover 50 and the core 21 is larger than the sum of the magnetic force between the mover 50 and the upper plate 41 and the upward pressing force by the spring 100. . Thereby, even in a state where no current is supplied to the coil 23, the state shown in FIG. 1, that is, the state where the valve portion 60 is opened can be maintained.

  On the other hand, in the state shown in FIG. 2, since the mover 50 and the core 21 are separated in the axial direction (Z-axis direction), the magnetic force between the mover 50 and the core 21 is larger than that in the state shown in FIG. Small. In the state shown in FIG. 2, the magnetic force between the mover 50 and the core 21 is greater than the sum of the magnetic force between the mover 50 and the upper plate 41 and the upward pressing force by the spring 100. small. Thereby, even in a state where no current is supplied to the coil 23, the state shown in FIG. 2, that is, the state where the valve portion 60 is closed can be maintained.

  As described above, according to the present embodiment, current is supplied to the coil 23 by the magnetic force generated by the permanent magnet 90 and the magnetic circuit passing through the core 21, the mover 50, and the cover 40 and the pressing force of the spring 100. Even in the absence, the open / closed state of the valve unit 60 can be maintained. Therefore, according to the present embodiment, it is not necessary to supply current to the coil 23 in order to maintain the state in which the valve unit 60 is open and the state in which the valve unit 60 is closed, and the power consumption of the electromagnetic valve 10 can be reduced.

[Valve]
The valve unit 60 is provided outside the cover 40. The valve unit 60 is attached to the upper side (+ Z side) of the cover 40. The valve unit 60 includes a first nozzle member 61, a second nozzle member 62, and a valve body 63. A valve chamber 64 is configured by the first nozzle member 61 and the second nozzle member 62. The valve body 63 is accommodated in the valve chamber 64. The valve body 63 is, for example, a sphere.

  The first nozzle member 61 is attached to the upper side (+ Z side) of the second nozzle member 62. The first nozzle member 61 is provided with an import 61a and an import communication hole 61c. The import 61a opens upward. The import 61a is a fluid inlet. The upper end of the import 61a is connected to a pump (not shown), for example.

  The import communication hole 61c is connected to the lower end of the import 61a. The import communication hole 61c can communicate the valve chamber 64 and the import 61a. An upper valve seat 61b is provided at the lower end of the import communication hole 61c.

  The second nozzle member 62 is fixed to the upper surface of the upper plate 41 of the cover 40. The second nozzle member 62 is provided with an out port 62a and a drain port 62c. The out port 62a is a fluid outlet. The out port 62a is open on the + Y side, for example. The out port 62 a communicates with the valve chamber 64.

  For example, the drain port 62c penetrates the second nozzle member 62 in the radial direction (Y-axis direction). The drain port 62 c can communicate with the valve chamber 64. The drain port 62c is open to the atmosphere.

  The second nozzle member 62 is provided with a fitting hole 62e penetrating in the axial direction (Z-axis direction) from the lower surface of the second nozzle member 62 to the drain port 62c. The pin guide member 31 is fitted in the fitting hole 62e.

  The second nozzle member 62 is provided with a drain port communication hole 62b. The drain port communication hole 62b can connect the valve chamber 64 and the drain port 62c. A lower valve seat portion 62d is provided at the upper end of the drain port communication hole portion 62b.

[pin]
The pin 70 is located in the hole 41e. The pin 70 is held by the pin guide member 31 so as to be movable in the axial direction (Z-axis direction). The pin 70 is, for example, a cylindrical shape extending in the axial direction. At the upper end of the pin 70, for example, a portion with a small diameter is provided. The pin 70 passes through the fitting hole 62e and the drain port 62c in the axial direction and extends to the drain port communication hole 62b. The lower end of the pin 70 can contact the upper surface of the mover 50. The upper end of the pin 70 can contact the valve body 63.

Hereinafter, the operation of the electromagnetic valve 10 of the present embodiment will be described.
In the state where the valve unit 60 shown in FIG. 1 is opened, the lower surface of the mover 50 is in contact with the core 21. A space AR <b> 1 is provided between the upper surface of the mover 50 and the upper plate 41. The lower end of the pin 70 is in contact with the upper surface of the mover 50, for example.

  In the state in which the valve part 60 is opened, the import 61a and the outport 62a communicate with each other via the import communication hole part 61c and the valve chamber 64. Therefore, the fluid that has flowed into the valve portion 60 from the import 61a flows out of the valve portion 60 from the outport 62a. The valve body 63 pushed down by the fluid flowing into the import 61a fits into the lower valve seat portion 62d and closes the drain port communication hole portion 62b.

  When a current is passed through the coil 23 in a state where the valve unit 60 is open, a magnetic flux is generated from the coil 23. The magnetic flux generated from the coil 23 goes, for example, from the upper side (+ Z side) to the lower side (−Z side) of the coil 23. That is, the magnetic flux generated from the coil 23 advances from the upper side to the lower side through the mover 50 and the core 21, for example. Then, the magnetic flux generated from the coil 23 travels upward through the cylindrical portion 43 of the cover 40 and returns to the mover 50 from the upper surface. As described above, when a current flows through the coil 23, a magnetic circuit of the coil 23 is configured.

  In the magnetic circuit of the coil 23, magnetic flux flows through the mover 50 and the core 21 from the upper side (+ Z side) to the lower side (−Z side). That is, the flow of magnetic flux in the mover 50 and the core 21 by the magnetic circuit of the coil 23 is opposite to the flow of magnetic flux in the mover 50 and the core 21 by the magnetic circuit of the permanent magnet 90 described above. Therefore, in the mover 50 and the core 21, the magnetic flux generated by the magnetic circuit of the coil 23 and the magnetic flux generated by the magnetic circuit of the permanent magnet 90 weaken each other. Thereby, the magnetic force between the needle | mover 50 and the core 21 becomes small.

  As a result, the magnetic force between the mover 50 and the core 21 is smaller than the sum of the magnetic force between the mover 50 and the upper plate 41 and the upward pressing force of the spring 100. Therefore, the mover 50 moves in the guide bush 30 upward (+ Z side). When the mover 50 moves upward, the upper surface of the mover 50 comes into contact with the lower (−Z side) end of the pin 70. As a result, the mover 50 moves upward and the pin 70 is pushed upward.

  As shown in FIG. 2, when the pin 70 is pushed upward (+ Z side), the upper end of the pin 70 pushes the valve body 63 upward. Thereby, the valve body 63 fits into the upper valve seat portion 61b and closes the import communication hole portion 61c. As a result, the flow of fluid between the import 61a and the outport 62a is blocked, and the valve unit 60 is closed. In a state where the valve portion 60 is closed, a space AR <b> 2 is provided between the upper surface of the mover 50 and the core 21.

  When the valve part 60 is closed, the drain port communication hole part 62b is opened. Therefore, the out port 62a and the drain port 62c communicate with each other. The fluid having a large pressure remaining in the out port 62a flows to the drain port 62c. Since the drain port 62c is open to the atmosphere, the pressure of the fluid flowing into the drain port 62c decreases.

  In this way, the valve unit 60 can be changed from an open state to a closed state. Here, after the valve portion 60 shifts to the closed state shown in FIG. 2, as described above, the state of the valve portion 60 is maintained in the state of FIG. 2 even if the current supplied to the coil 23 is stopped. The In this case, the force obtained by adding the magnetic force between the mover 50 and the upper plate 41 and the upward pressing force by the spring 100 is equal to the magnetic force between the mover 50 and the core 21, and the valve body. This is greater than the sum of the downward pressing force by the fluid transmitted to the mover 50 via the pin 63 and the pin 70.

  When the valve unit 60 is changed from the closed state to the opened state again, the direction of the current supplied to the coil 23 is reversed from that in the case where the valve unit 60 is changed from the opened state to the closed state. As a result, the magnetic circuit of the coil 23 is configured in a direction opposite to that when the coil 23 is changed from the open state to the closed state. Therefore, the magnetic flux generated by the permanent magnet 90 and the magnetic flux generated by the coil 23 in the mover 50 and the core 21. And strengthen each other. As a result, the magnetic force between the mover 50 and the core 21 becomes larger than the sum of the magnetic force between the mover 50 and the upper plate 41 and the upward pressing force of the spring 100, and the mover 50 is drawn to the core 21.

  When the mover 50 moves downward (−Z side), the valve body 63 and the pin 70 move downward due to the pressure of the fluid flowing into the import 61a and the weight of each member. As a result, the import 61a and the outport 62a communicate with each other via the import communication hole 61c and the valve chamber 64, and the valve 60 is opened again. After the valve unit 60 has shifted to the open state shown in FIG. 1, as described above, even when the current supplied to the coil 23 is stopped, the state of the valve unit 60 is maintained in the state shown in FIG.

  As described above, the pin 70 moves as the mover 50 moves, and the valve portion 60 is opened and closed. That is, the valve unit 60 is opened and closed as the mover 50 and the pin 70 move.

  As described above, when the mover 50 is moved to switch the opening and closing of the valve unit 60, the atmospheric pressure in the cover 40 is likely to fluctuate. For example, when the valve unit 60 shown in FIG. 2 is closed and the valve unit 60 shown in FIG. 1 is opened, the clearance between the guide bush 30 and the mover 50 is narrow, so that the valve unit 60 is open. The atmospheric pressure of the space AR1 generated in is likely to be low. As a result, there is a possibility that the fluid that has flowed into the drain port 62c that is released from the atmospheric pressure is sucked into the space AR1 through the fitting hole 62e and the clearance between the pin guide member 31 and the pin 70.

  When the fluid is, for example, oil or the like, the fluid may contain foreign matters such as metal pieces and iron powder. For this reason, when the fluid enters the space AR1, foreign matter may adhere to the mover 50 and the core 21 excited by the permanent magnet 90. In addition, fluid may enter the gap between the core 21 and the bobbin portion 24 and foreign matter may adhere to the permanent magnet 90.

  When foreign matter enters between the radial direction of the mover 50 and the guide bush 30, the movement of the mover 50 in the axial direction (Z-axis direction) is hindered, and the valve unit 60 may not be normally opened and closed. Further, when foreign matter adheres to the core 21 and the permanent magnet 90, the magnetic force generated between the core 21 and the mover 50 changes, and the magnetic force generated between the core 21 and the mover 50 and the pressing force of the spring 100 are changed. There is a risk that the balance will be lost. For this reason, there is a possibility that the open / close state of the valve unit 60 may not be switched even if a current is passed through the coil 23.

  On the other hand, according to the present embodiment, since the through-hole 51 is provided in the mover 50, when the mover 50 moves, the air passes through the through-hole 51 and the pressure in the cover 40 is increased. Variation can be suppressed. For example, when the valve unit 60 shown in FIG. 2 is closed and the valve unit 60 shown in FIG. 1 is opened, the air in the space AR2 shown in FIG. It flows in the space AR1 shown in FIG. Thereby, it is suppressed that the atmospheric | air pressure of space AR1 falls. Therefore, it is possible to suppress the fluid from entering the space AR1 from the drain port 62c, that is, the cover 40. As a result, it is possible to prevent foreign matter from adhering to the permanent magnet 90 or the movable element 50 and the core 21 excited by the permanent magnet 90.

  In addition, according to the present embodiment, as described above, the penetration of fluid into the cover 40 can be suppressed by suppressing the pressure fluctuation in the cover 40 by the through hole 51 provided in the mover 50. Therefore, it is not necessary to provide a separate sealing member, and the solenoid valve 10 can be prevented from increasing in size. As described above, according to the present embodiment, it is possible to obtain the electromagnetic valve 10 having a structure capable of suppressing the adhesion of foreign matter to the permanent magnet 90 and the like while suppressing the increase in size.

  In the present embodiment, the following configuration may be employed.

  In the present embodiment, the shape of the through hole 51 is not particularly limited as long as the shape is open on the upper surface of the mover 50 and the lower surface of the mover 50. The cross-sectional shape of the through hole 51 may be, for example, a quadrangular shape, a polygonal shape, a semicircular shape, or the like. The diameter of the through hole 51 may be, for example, the same in the entire axial direction or may vary. Moreover, the through hole 51 may extend in a curved shape.

  Further, in the above description, the movable element 50 is a single member and the whole is a magnetic part, but is not limited thereto. For example, the mover 50 may have a portion that is not a magnetic body.

  In the present embodiment, the lower plate 42 may be made of a magnetic material. In the present embodiment, the cover 40 may be a single member. In that case, the entire cover 40 can be made of a magnetic material.

  Further, in the present embodiment, the spring 100 may not be located on the radially inner side of the through hole 51. In the present embodiment, the permanent magnet 90 may be divided in the circumferential direction.

  In addition, the solenoid valve to which the present invention is applied is not particularly limited. That is, although the electromagnetic valve 10 described above is a self-holding electromagnetic valve using the spring 100, the electromagnetic valve to which the present invention is applied is not limited thereto. The present invention may be applied to, for example, a self-holding solenoid valve that does not use the spring 100, or may be applied to a solenoid valve other than the self-holding type.

  Moreover, each said structure can be suitably combined in the range which does not mutually contradict.

  DESCRIPTION OF SYMBOLS 10 ... Solenoid valve, 20 ... Solenoid, 21 ... Core, 23 ... Coil, 30 ... Guide bush (guide part), 31 ... Pin guide member, 40 ... Cover, 41 ... Upper plate (1st plate), 41e ... Hole , 42 ... lower plate (second plate), 43 ... cylindrical part, 50 ... mover, 51 ... through hole, 51a ... small diameter part, 51b ... large diameter part, 60 ... valve part, 70 ... pin, 90 ... Permanent magnet, 100 ... spring, J ... center axis

Claims (9)

A solenoid having a cylindrical guide portion centered on a central axis extending in the axial direction;
A mover having a magnetic part and moving in the axial direction on the radially inner side of the guide part;
A cover containing the solenoid and the mover and having a hole;
A pin that is located in the hole, the end on the other side in the axial direction contacts the one side in the axial direction of the mover, and moves with the movement of the mover;
A cylindrical pin guide member that holds the pin movably in the axial direction and is supported by the cover;
A valve body that opens and closes a fluid passage, and is provided outside the cover, and is opened and closed by contacting one end of the pin in the axial direction with the valve body as the pin moves in the axial direction; A valve portion to be
A magnetic core disposed inside the cover and facing the mover and the axial direction;
A permanent magnet that forms a magnetic circuit through which the radially inner surface contacts the core and passes through the core, the mover, and the cover;
With
The cover has a cylindrical portion made of a magnetic material that surrounds a radially outer side of the solenoid,
The entire core is covered by the cover from the other axial side,
An electromagnetic valve in which the movable element is provided with a through hole that penetrates the movable element in the axial direction.   The electromagnetic valve according to claim 1, wherein the through hole extends linearly in the axial direction.   The solenoid valve according to claim 2, wherein a cross-sectional shape of the through hole is a circular shape concentric with the central axis. Located between the axial direction between the before and SL core armature comprises a springback grayed that presses the movable element in a direction towards said pin,
The solenoid has a coil formed by winding a conductive wire around the central axis,
4. The electromagnetic valve according to claim 1, wherein at least a part of the core is located on the radially inner side of the coil. 5.   The solenoid valve according to claim 4, wherein at least a part of the spring is located on the radially inner side of the through hole. The through hole has a small diameter portion and a large diameter portion,
The large diameter portion is larger in diameter than the small diameter portion, and is located on the core side in the axial direction of the small diameter portion,
The solenoid valve according to claim 5, wherein at least a part of the spring is located on the radially inner side of the large diameter portion.   The electromagnetic valve according to claim 4, wherein the permanent magnet has two magnetic poles arranged along the radial direction. The pin guide member extends in the axial direction,
The solenoid valve according to claim 1, wherein the pin moves in the axial direction.   The cover is located on one side of the solenoid in the axial direction and attached to the cylindrical part; the second plate is located on the other side of the solenoid in the axial direction and attached to the cylindrical part; The electromagnetic valve according to claim 1, comprising:

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