JP4620703B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve including a main valve portion and a solenoid portion.

  Generally, an electromagnetic valve is composed of a main valve portion having a valve body for switching a flow path, and a solenoid portion that drives the valve body in a direction in which the valve body comes in contact with and separates from the valve seat (for example, Patent Document 1). reference). As shown in FIG. 6, in the electromagnetic valve 80 disclosed in Patent Document 1, a housing 82 forming the main valve portion 81 is provided with a supply port 82a, an output port 82b, and a discharge port 82c. An attachment hole 82d is formed in the bottom of the housing 82. A retainer 84 is inserted into the attachment hole 82d through a seal member 83 and the retainer 84 is supported by the fixing plate 85, so that the housing 82 It is attached. A valve chamber 87 is defined in the housing 82 by a retainer 84.

  The retainer 84 is provided with a communication hole 86 that allows the supply port 82a and the valve chamber 87 to communicate with each other, and a supply orifice 88 that allows the communication hole 86 and the valve chamber 87 to communicate with each other. Further, the discharge port 82 c communicates with the valve chamber 87 through the discharge orifice 89. A valve member (valve element) 90 is accommodated in the valve chamber 87, and a supply valve seat 91 a is provided around the supply orifice 88 in the retainer 84. In the housing 82, a discharge valve seat 91 b is provided around the discharge orifice 89.

The electromagnetic operation unit 92 includes a hollow bobbin 94 around which an excitation coil 93 is wound, a fixed iron core 95 and a movable iron core 96 accommodated in the bobbin 94, a magnetic cover 97 in which the bobbin 94 is accommodated, and an excitation coil. 93 and a pair of coil terminals 98 conducted to 93. The electromagnetic valve 80 can switch the flow path by driving the valve member 90 with the electromagnetic operation unit 92.
JP 2007-10084 A

  In the electromagnetic valve 80 having the above-described configuration, the valve chamber 87 is defined by a retainer 84 inserted into the mounting hole 82 d of the housing 82, and the retainer 84 is supported by a fixing plate 85. For this reason, the size of the valve chamber 87 depends on the mounting state of the retainer 84 in the mounting hole 82d. Since the fixing plate 85 is inserted into the mounting hole 82d along the moving direction of the valve member 90, the position of the retainer 84 changes depending on the position of the fixing plate 85, and the position of the supply valve seat 91a with respect to the discharge valve seat 91b changes. Resulting in. Further, a seal member 83 is interposed between the retainer 84 and the mounting hole 82d. For this reason, in addition to the support position of the retainer 84 by the fixing plate 85, the position of the supply valve seat 91a with respect to the discharge valve seat 91b is likely to change due to the influence of the elastic force of the seal member 83. Therefore, there is a problem that the gap between the supply valve seat 91a and the discharge valve seat 91b is likely to vary, and as a result, the stroke amount of the valve member 90 varies and the performance of the electromagnetic valve 80 decreases.

  An object of the present invention is to provide an electromagnetic valve that can prevent variation in the interval between the discharge valve seat and the supply valve seat, and can prevent performance degradation.

  In order to solve the above problems, the invention according to claim 1 is characterized in that a valve body is accommodated in a valve chamber formed in the body, and a supply port, an output port, and a discharge port are formed in the body. A main valve section that allows switching of the flow path by contact and separation of the valve body with respect to a supply valve seat and a discharge valve seat provided in the valve chamber, and an outer coil is formed by a magnetic cover, and an exciting coil is wound around a fixed iron core. An electromagnetic valve comprising: a fixed magnetic pole member mounted; and a solenoid unit that drives the valve body in a direction to contact and separate from a supply valve seat by a movable core that contacts and separates from the fixed iron core, The body is formed of a synthetic resin material in a bottomed box shape, and the supply valve seat is integrally formed. In the valve chamber, a discharge passage for communicating the discharge port and the valve chamber is formed, and the discharge valve Is formed in a direction in which the valve body contacts and separates at a position where the distance between the discharge valve seat and the supply valve seat is a predetermined stroke of the valve body. The gist is that it is positioned and fixed from a direction perpendicular to the direction.

  According to a second aspect of the present invention, in the electromagnetic valve according to the first aspect, the movable iron core is provided with a connecting portion that integrally connects the movable iron core and the valve body, and the magnetic cover is provided with the magnetic cover. The gist of the present invention is that an extending portion is formed so as to face the outside of the movable iron core and to be arranged at a position where a magnetic circuit passing from the magnetic cover through the movable iron core is formed by energizing the exciting coil.

  According to a third aspect of the present invention, in the electromagnetic valve according to the second aspect, the valve body is provided with a holding sheet connected to the connecting portion of the movable iron core, and the holding sheet is made of a magnetic material. It is a summary.

  According to a fourth aspect of the present invention, in the electromagnetic valve according to any one of the first to third aspects, the discharge portion forming member is made of a nonmagnetic material and guides the movement of the movable iron core. The gist is that a guide portion is provided.

  According to a fifth aspect of the present invention, in the electromagnetic valve according to any one of the first to fourth aspects, the magnetic cover is integrated with the body when the body is molded, and the magnetic cover The gist is that the fixed magnetic pole member is fixed.

  According to the present invention, it is possible to prevent variation in the interval between the discharge valve seat and the supply valve seat, and it is possible to prevent performance degradation.

  Hereinafter, one embodiment of a solenoid valve embodying the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the electromagnetic valve 11 includes a pilot-type main valve portion 21 having a valve body 27 for switching a fluid flow path, and a solenoid portion 41 for driving the valve body 27. It is configured.

  First, the main valve part 21 side in the solenoid valve 11 will be described. The main valve portion 21 has a body 22 formed in a bottomed box shape from a nonmagnetic material (synthetic resin material). The body 22 is integrated with a magnetic cover 42 that forms an outline of the solenoid portion 41. First, the body 22 that forms the outline of the main valve portion 21 will be described. A supply port P, an output port A, and a discharge port R are provided on one side surface of the body 22 (see FIG. 1). Positive pressure air is supplied to the supply port P from a positive pressure supply source via a pipe, and the output port A is connected to a pneumatic device such as an air cylinder via the pipe. Further, an exhaust pipe is connected to the discharge port R.

  The body 22 has an accommodation recess 22a that opens upward, and the discharge portion forming member 15 is accommodated in the accommodation recess 22a. As shown in FIG. 3, the discharge portion forming member 15 is formed in a substantially rectangular parallelepiped shape from a synthetic resin material (for example, PPS). As shown in FIGS. 1 and 2, the discharge portion forming member 15 is formed with a discharge passage 15 a that extends in the length direction of the discharge portion forming member 15 and opens on one side surface of the discharge portion forming member 15. . Further, an annular gasket G surrounding the discharge passage 15a is attached to one side surface where the discharge passage 15a is opened. Further, the discharge portion forming member 15 is formed with a discharge port 15b that communicates with the discharge passage 15a and extends in a direction perpendicular to the discharge passage 15a. And in the discharge part formation member 15, the discharge valve seat 15c is formed in the surface where the discharge port 15b opens so that the discharge port 15b may be enclosed.

  The discharge portion forming member 15 having the above-described configuration is positioned in the housing recess 22a so that the discharge passage 15a communicates with the discharge port R. In this positioning state, the gasket G is interposed between one side surface of the discharge portion forming member 15 and the inner surface of the body 22 facing the one side surface, and fluid leakage from the discharge passage 15a is suppressed by the gasket G. Has been. In the discharge portion forming member 15, a guide shaft 15d protrudes from a surface facing away from the surface where the discharge valve seat 15c is formed.

  In the body 22, a valve chamber 23 is defined between the discharge portion forming member 15 and the bottom portion of the housing recess 22a. The body 22 is provided with a supply passage 24 communicating with the supply port P, and a supply port 22c communicating with the supply passage 24 and the valve chamber 23 is formed at a position where the bottom of the housing recess 22a is formed. ing. A supply valve seat 22d is formed at a position surrounding the supply port 22c at a position where the bottom of the housing recess 22a is formed. The supply port P communicates with the valve chamber 23 through the supply passage 24 and the supply port 22c. Further, the discharge port R communicates with the inside of the valve chamber 23 through a discharge passage 15 a and a discharge port 15 b formed in the discharge portion forming member 15. The output port A is also in communication with the valve chamber 23.

  A valve body 27 is accommodated in the valve chamber 23 and between the supply valve seat 22d and the discharge valve seat 15c. The valve body 27 is formed from a valve body 27a formed in a cylindrical shape from a rubber material, and a holding sheet 27b made of a soft magnetic material joined to the valve body 27a. As shown in FIG. 3, the holding sheet 27b has an elongated plate shape, and extends in the opposite direction along the radial direction of the valve body 27a in the joined state to the valve body 27a. As shown in FIGS. 1 and 2, a valve return spring 30 is interposed between the valve body 27 and the body 22 in the valve chamber 23, and the valve body 27 is supplied by the spring force of the valve return spring 30. It is biased in a direction away from the valve seat 22d.

  4 and 5, when the valve body 27 moves away from the supply valve seat 22d, the valve body 27 is seated on the discharge valve seat 15c, the discharge port 15b is closed, and the supply port 22c is opened. Then, the supply port P and the output port A communicate with each other through the valve chamber 23, and positive pressure air is supplied from the output port A to the pneumatic equipment. Further, as shown in FIGS. 1 and 2, when the valve body 27 moves away from the discharge valve seat 15c, the valve body 27 is seated on the supply valve seat 22d, the supply port 22c is closed and the discharge port is closed. 15b is opened. Then, the output port A and the discharge port R are communicated with each other through the valve chamber 23.

  In the solenoid valve 11, the iron core chamber 32 is formed in a space surrounded by the end surface of the discharge portion forming member 15 where the guide shaft 15d is formed, the end surface of the solenoid portion 41 on the body 22 side, and the inner peripheral surface of the housing recess 22a. A compartment is formed. A guide member 16 made of a nonmagnetic material (for example, a synthetic resin material) is attached to the guide shaft 15d. The guide member 16 is integrally provided with a cylindrical tube portion 16a and a cylindrical guide portion 16b having a larger diameter than the cylindrical portion 16a. The guide member 16 is attached to the guide shaft 15d so that the guide portion 16b is positioned on the solenoid portion 41 side.

  A movable iron core 33 is attached to the guide member 16, and the movable iron core 33 is disposed in the iron core chamber 32. As shown in FIG. 3, the movable iron core 33 is formed in a block shape from a magnetic material, and a guide hole 33a penetrating in the thickness direction of the movable iron core 33 is formed, and the guide member 16 is inserted into the guide hole 33a. ing. As shown in FIGS. 1 and 2, an iron core return spring 34 is interposed between the movable iron core 33 and the guide portion 16b of the guide member 16. The spring force of the iron core return spring 34 causes the movable iron core 33 to be a valve. It is urged toward the chamber 23 side. The movable iron core 33 is guided so as to move along the axial direction of the guide member 16 when the peripheral surface of the guide hole 33 a is in sliding contact with the guide portion 16 b of the guide member 16.

  As shown in FIG. 3, the movable iron core 33 is provided with a connecting portion 33 b extending toward the valve body 27. A connecting recess 33c is recessed at the tip of each connecting portion 33b. And as shown in FIG. 2, the both ends of the holding sheet 27b in the valve body 27 are joined to the connection recess 33c of each connection part 33b, and the movable iron core 33 and the valve body 27 are connected via the connection part 33b. They are connected together. Further, in a state where the movable iron core 33 is urged toward the valve chamber 23 by the iron core return spring 34, the valve element 27 is pressed against the supply valve seat 22d.

  Next, the solenoid unit 41 will be described. As shown in FIGS. 1 and 2, the solenoid unit 41 includes a fixed magnetic pole member 45 in which an excitation coil 43 is wound around a fixed iron core 44, and a magnetic cover that surrounds the fixed magnetic pole member 45 and forms an outline of the solenoid unit 41. 42 and the movable iron core 33 that can be moved toward and away from the fixed iron core 44.

  The solenoid unit 41 will be described in detail. The outer shell of the solenoid 41 is formed by a rectangular cylindrical magnetic cover 42 made of a magnetic material such as iron (see FIG. 3). Further, in the magnetic cover 42, extending portions 42a are formed on the respective side walls, the extending portions 42a extend obliquely toward the inside of the magnetic cover 42, and are further bent so as to extend parallel to the side walls. ing. The magnetic cover 42 is integrated with the body 22 by inserting an extending portion 42 a into the body 22 when the body 22 is molded in the main valve portion 21. The extending portion 42 a inserted into the body 22 is bent toward the inside of the magnetic cover 42 and is disposed close to the four side surfaces of the movable iron core 33. The movable core 33 is configured such that the portion excluding the connecting portion 33b moves within the length of the extending portion 42a.

  Inside the magnetic cover 42, a fixed magnetic pole member 45 formed by winding an exciting coil 43 around a fixed iron core 44 is provided. The fixed iron core 44 is made of a soft magnetic material (metal). The fixed iron core 44 is covered with an insulating coating 48. The insulating coating 48 is provided at a position where the stationary iron core 44 and the exciting coil 43 can be insulated when the exciting coil 43 is wound around the stationary iron core 44. In the insulating coating 48, a pair of coil terminals 49 are fitted into one end side of the fixed iron core 44, and the exciting coil 43 is electrically connected to the coil terminals 49. The magnet coil 43 is wound around the fixed iron core 44 by winding a magnet wire around the fixed iron core 44 coated with the insulating film portion 48, thereby forming the fixed magnetic pole member 45. ing.

  The fixed magnetic pole member 45 is joined (fixed) to the magnetic cover 42 by laser welding the peripheral surface of one end of the fixed iron core 44 to the inner surface of the magnetic cover 42. Further, when the fixed magnetic pole member 45 and the magnetic cover 42 are joined, the iron core chamber 32 is defined between the fixed magnetic pole member 45 and the body 22, and a seal is provided between the fixed magnetic pole member 45 and the body 22. A member 14 is interposed.

  The solenoid valve 11 is assembled in the following order. First, the movable iron core 33 is attached to the guide shaft 15d of the discharge portion forming member 15, and then the iron core return spring 34 is attached to the guide shaft 15d, and then the guide member 16 is attached to the guide shaft 15d. At this time, the iron core return spring 34 is interposed between the movable iron core 33 and the guide portion 16b of the guide member 16, and the guide hole 33a in the movable iron core 33 is located outside the guide portion 16b.

  Next, the holding sheet 27b of the valve body 27 is joined to the connection recess 33c of the connection portion 33b of the movable core 33, and the movable core 33 and the valve body 27 are integrated. Then, the discharge part forming member 15, the guide member 16, the valve body 27, the movable iron core 33, and the iron core return spring 34 are assembled to form a pre-assembly.

  Next, the valve return spring 30 is inserted into the housing recess 22 a and the front assembly is housed in the housing recess 22 a of the body 22. Then, the discharge passage 15a in the discharge portion forming member 15 and the discharge port R in the body 22 are matched, and the discharge portion forming member 15 is set so that the interval between the supply valve seat 22d and the discharge valve seat 15c becomes a predetermined value. That is, the front assembly is positioned on the body 22.

  The discharge portion forming member 15 is positioned by pressing a steel ball 25 into a mounting hole 22 b formed in the body 22 and pressing the discharge portion forming member 15 against the body 22 by the steel ball 25. That is, positioning of the discharge portion forming member 15 (front assembly) with respect to the body 22 is performed by pressing the discharge portion forming member 15 against the body 22 in a direction orthogonal to the direction in which the valve body 27 contacts and separates. A gasket G is interposed between the side surface of the discharge portion forming member 15 and the inner surface of the body 22 facing the side surface.

  Next, in the fixed magnetic pole member 45 in which the exciting coil 43 is wound around the fixed iron core 44, the insulating coating 48 on the other end side is fixed while being pressed against the end surface (upper end surface) on the solenoid unit 41 side of the body 22. One end of the magnetic pole member 45 is joined (fixed) to the inner surface of the magnetic cover 42 by laser welding. At this time, the seal member 14 is interposed between the insulating coating 48 on the other end side of the fixed magnetic pole member 45 and the end surface of the body 22. Further, the tip end of the guide shaft 15 d is press-fitted into the fixed iron core 44. As a result, the electromagnetic valve 11 is assembled.

  In the electromagnetic valve 11 having the above-described configuration, as shown in FIGS. 1 and 2, when the exciting coil 43 is not energized, the movable iron core 33 is separated from the fixed iron core 44 by the spring force of the iron core return spring 34. It is arranged. At this time, since the valve element 27 integrated with the movable iron core 33 is pressed against the supply valve seat 22d against the spring force of the valve return spring 30, the supply port 22c is closed and the output port A and the discharge port are closed. R communicates with each other through the valve chamber 23. When the excitation coil 43 is energized from this state, a magnetic circuit around the excitation coil 43 passes through the fixed iron core 44, the magnetic cover 42, and the extension iron portion 42a through the movable iron core 33 toward the fixed iron core 44. It is formed.

  Then, as shown in FIGS. 4 and 5, the movable iron core 33 is attracted to the stationary iron core 44 against the spring force of the iron core return spring 34. At this time, the holding sheet 27b in the valve body 27 is integrated with the movable iron core 33 by the connecting portion 33b, and is made of a magnetic material. The holding sheet 27b is positioned on the magnetic circuit. Therefore, the valve body 27 itself becomes an electromagnet and is attracted to the fixed iron core 44 together with the movable iron core 33. Then, the valve element 27 is separated from the supply valve seat 22d by the suction force of the fixed iron core 44 and the spring force of the valve return spring 30 and is seated on the discharge valve seat 15c, the supply passage 24 is opened, and the discharge passage 15a is closed. Is done. For this reason, the supply port P and the output port A communicate with each other via the valve chamber 23, and the fluid flow path is switched. On the other hand, when the exciting coil 43 is deenergized, the movable iron core 33 returns to the initial position by the spring force of the iron core return spring 34.

  According to the above embodiment, the following effects can be obtained.

  (1) The body 22 is formed in a bottomed box shape, and a supply valve seat 22d is integrally formed. And the valve chamber 23 is formed by positioning the discharge part formation member 15 in the accommodation recessed part 22a of the body 22. FIG. The discharge portion forming member 15 is positioned on the body 22 by pressing the discharge portion forming member 15 against the body 22 in a direction orthogonal to the direction in which the valve body 27 contacts and separates. For this reason, for example, as compared with the case where the discharge portion forming member 15 is positioned on the body 22 along the direction in which the valve body 27 contacts and separates, the interval between the discharge valve seat 15c and the supply valve seat 22d is made accurate. Can do. For this reason, the stroke amount of the valve body 27 in the valve chamber 23 can be made constant to prevent the performance of the electromagnetic valve 11 from being deteriorated.

  (2) The magnetic cover 42 is integrated with the body 22, and the fixed magnetic pole member 45 is joined to the inner surface of the magnetic cover 42. For this reason, for example, in the electromagnetic valve 11, the members are separated from each other or are pressed against each other due to a difference in screwing force as in the case where the magnetic cover 42, the body 22, and the fixed magnetic pole member 45 are screwed. It wo n’t be too much. Therefore, it is possible to suppress a dimensional error that occurs during assembly of the electromagnetic valve 11 as much as possible, and to make the interval between the discharge valve seat 15c and the supply valve seat 22d accurate. For this reason, the stroke amount of the valve body 27 in the valve chamber 23 can be made constant to prevent the performance of the electromagnetic valve 11 from being deteriorated. Further, the assembling work can be facilitated as compared with the case where the solenoid valve 11 is assembled by screwing each member.

  (3) The extending portion 42 a formed on the magnetic cover 42 is disposed at a position surrounding the movable iron core 33 and is bent inside the magnetic cover 42 so as to be close to the movable iron core 33. For this reason, compared with the case where the extension part 42a is not formed, the magnetic flux density of the magnetic circuit which goes to the movable iron core 33 from the magnetic cover 42 can be increased, and the attractive force of the movable iron core 33 to the fixed iron core 44 is increased. Can do. Moreover, the energization amount required for generating the predetermined attractive force can be suppressed as compared with the case where the extending portion 42a is not formed, and the electromagnetic valve 11 can be a power saving type.

  (4) Further, the holding sheet 27b of the valve body 27 is joined to the connecting portion 33b included in the movable iron core 33, and the holding sheet 27b is made of a magnetic material. When the magnetic circuit is formed, the holding sheet 27 b also becomes an electromagnet and is attracted to the fixed iron core 44. For this reason, for example, when the holding sheet 27 b is not formed on the valve body 27 and the movable iron core 33 is attracted to the fixed iron core 44, the valve is compared with the case where it moves only by the spring force of the valve return spring 30. The body 27 can be moved quickly.

  (5) A guide member 16 made of a nonmagnetic material is mounted on the guide shaft 15d provided on the discharge portion forming member 15, and the guide member 16 is provided with a guide portion 16b. The movable iron core 33 is mounted outside the guide portion 16b, and the guide hole 33a of the movable iron core 33 is slidably contacted with the guide portion 16b to guide the movable iron core 33 so as to move in the axial direction of the guide member 16. Can do.

  In addition, you may change the said embodiment as follows.

  The fixed magnetic pole member 45 and the magnetic cover 42 may be fixed by screwing.

  The holding sheet 27b in the valve body 27 and the connecting portion 33b in the movable iron core 33 may not be joined.

  ○ The valve return spring 30 may be omitted.

  The discharge part forming member 15 may be positioned on the body 22 by screwing.

  In the main valve portion 21, the switching method and the number of ports of the valve body 27 may be arbitrarily changed. That is, the switching method of the valve body 27 may be a spool type, and the number of ports may be 2 ports, 4 ports, or 5 ports.

  The guide member 16 may be deleted. In this case, the guide shaft 15 d guides the movement of the movable iron core 33.

Sectional drawing which shows the solenoid valve of embodiment. Sectional drawing which shows the solenoid valve of embodiment. The perspective view which shows the member which forms the solenoid valve of embodiment. The half sectional view showing the state where the valve element of the solenoid valve moved. The half sectional view showing the state where the valve element of the solenoid valve moved. Sectional drawing which shows the solenoid valve of background art.

Explanation of symbols

  A ... output port, P ... supply port, R ... discharge port, 11 ... electromagnetic valve, 15 ... discharge portion forming member, 15a ... discharge passage, 15c ... discharge valve seat, 16b ... guide portion, 21 ... main valve portion, 22 ... Body, 22d ... Supply valve seat, 23 ... Valve chamber, 27 ... Valve body, 27b ... Holding sheet, 33 ... Movable core, 33b ... Connection part, 41 ... Solenoid part, 42 ... Magnetic cover, 42a ... Extension part, 43: Excitation coil, 44: Fixed iron core, 45: Fixed magnetic pole member.

Claims (5)

A valve body is accommodated in a valve chamber formed in the body, and a supply port, an output port, and a discharge port are formed in the body, and the valve body with respect to a supply valve seat and a discharge valve seat provided in the valve chamber And a fixed magnetic pole member in which an outer coil is formed by a magnetic cover and an excitation coil is wound around the fixed iron core. A solenoid valve that drives the valve element in a direction of moving toward and away from the supply valve seat by a movable iron core,
The body is formed of a synthetic resin material in a bottomed box shape, and the supply valve seat is integrally formed. In the valve chamber, a discharge passage for communicating the discharge port and the valve chamber is formed and the discharge is performed. A discharge portion forming member in which the valve seat is integrally formed is disposed, and the discharge portion forming member contacts and separates the valve body at a position where a distance between the discharge valve seat and the supply valve seat becomes a predetermined stroke of the valve body. A solenoid valve that is positioned and fixed in a direction perpendicular to the direction.   A connecting portion that integrally connects the movable iron core and the valve body extends to the movable iron core, and the magnetic cover is disposed opposite to the outer side of the movable iron core, and is energized to the excitation coil. The solenoid valve according to claim 1, wherein an extending portion is formed at a position where a magnetic circuit passing from the magnetic cover through the movable iron core is formed.   The electromagnetic valve according to claim 2, wherein the valve body is provided with a holding sheet connected to the connecting portion of the movable iron core, and the holding sheet is made of a magnetic material.   The electromagnetic valve according to any one of claims 1 to 3, wherein the discharge portion forming member is provided with a guide portion that is made of a nonmagnetic material and guides the movement of the movable iron core.   The electromagnetic valve according to any one of claims 1 to 4, wherein the magnetic cover is integrated with the body when the body is molded, and the fixed magnetic pole member is fixed to the magnetic cover.

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