TWI697639B - Solenoid valve - Google Patents

Abstract

The problem to be solved by the present invention is to provide a solenoid valve which can more reliably ensure grounding conduction. In order to solve this problem, the solenoid valve of the present invention is characterized by having: a valve body 2 having a valve body 22 and a housing 21 for accommodating the valve body 22; a molded member 4 having a bobbin 41 formed in a cylindrical shape , The electromagnetic coil 42 wound on the spool 41, the power plug 43 connected to an external power source, and the insulating molded resin 44, which connects the spool 41, the electromagnetic coil 42 and the power plug A part of 43 is molded; the insertion member 6 has a movable iron core 62, a cylindrical fixed iron core 61, and a rod body 621. The movable iron core 62 can move in the insertion direction relative to the molded member 4 and be inserted The through-mold member 4, the fixed iron core 61 is inserted into the mold member 4 so as not to move in the insertion direction relative to the mold member 4, and the movable iron core 62 is attracted by the electromagnetic coil 42 being energized, the rod body 621 The fixed iron core 61 is inserted through, one end of which is connected to the movable iron core 62 and the other end of which is connected to the valve body 22; and, the yoke member 5 has a cylindrical portion through which the molding member 4 can be inserted, and is formed in the cylindrical Both ends of the part are formed with the bottom of the hole through which the insertion member can be inserted; the power plug 43 has a ground terminal 432 connected to the ground wire of the external power source, and the ground terminal 432 is electrically connected to the yoke member 5.

Description

The electromagnetic valve

The present invention relates to a solenoid valve for linear movement of a movable iron core.

Previously, there is known a solenoid valve, which is provided with an electromagnetic solenoid and a valve body. The electromagnetic solenoid uses a coil to excite a fixed iron core, thereby causing the movable iron core to move linearly, and the movable iron core To drive the valve of the valve body. In addition, in recent years, the safety of solenoid valves has been demanded. As a standard of this safety, it is required to ensure the ground conduction of the electromagnetic solenoid.

As a method of ground conduction of a solenoid valve, there is a method of ground conduction via a yoke member. Here, a description will be given of the conventional solenoid valve that is grounded through a yoke member. Fig. 12 is a schematic cross-sectional view showing the structure of a conventional solenoid valve. Fig. 13 is a front view showing the structure of a conventional molded member.

As shown in Figures 12 and 13, the previous solenoid valve includes: a valve body 8 having a housing 81 and a valve body 82 built in the housing 81; and an electromagnetic solenoid 9 Drive the valve body 82. The electromagnetic solenoid 9 is constituted by a mold member 9 a and an insertion member 9 b that is inserted through the mold member 9 a and connected to the valve body 82 at one end. The insertion member 9b has a fixed iron core 91 and a movable iron core 92. The molded member 9a has: a cylindrical shape The bobbin 93 allows the insertion member 9b to be inserted; the electromagnetic coil 94, which is wound on the bobbin 93; the yoke member 95, which cooperates with the electromagnetic coil 94 to form a magnetic circuit; and the molded resin 96, which The bobbin 93, the electromagnetic coil 94, and the yoke member 95 are molded into a shape; and, the power plug 97 is provided outside the molded resin 96. The power plug 97 has two power terminals 971a and 971b connected to an external power source, and a ground terminal 972 connected to the ground wire of the external power source. The power terminals 971a and 971b are each electrically connected to the electromagnetic coil 94 via wires 973a and 973b, and the ground terminal 972 is electrically connected to the conductive yoke member 95 via wires 974. In addition, the lead wires 973a, 973b and the lead wire 974 are molded together with the bobbin 93, the electromagnetic coil 94, and the yoke member 95 by the molding resin 96.

The yoke member 95 is formed in a cylindrical shape in the interior of the molded resin 96 so that the penetration member 9b can be inserted through and surround the electromagnetic coil 94. The two bottom surfaces of the yoke member 95 are each formed with an insertion hole 951 through which the insertion member 9b is inserted, and as shown in FIG. 13, the bottom surface on the valve body 8 side of the two bottom surfaces is exposed in the mold The exterior of the resin 96 is made. In a state where the insertion member 9b is inserted into the electromagnetic solenoid 9, the fixed iron core 91 is in contact with the edge of the insertion hole 951, so that the ground terminal 972 is connected via the wire 974, the yoke member 95, and the fixed iron core 91 It is electrically connected to the housing 81, so the housing made of the solenoid valve is grounded.

In addition, as a related technology, a solenoid valve is known (see Patent Document 1), which is provided with a metallic valve body and an electromagnetic device that abuts against the valve body and operates the valve body. The electromagnetic device is composed of a plunger block ), and a coil block (coil block), In this coil assembly, the connecting parts connected with the electrical coil and the connecting parts for grounding are protrudingly arranged upward, the coil assembly and the magnetic circuit constituent members are molded by resin, and the connecting parts for grounding It is electrically connected to the magnetic circuit component, and the magnetic circuit component abuts against the valve body to be electrically connected, and the end is exposed on the contact surface.

[Prior Technical Literature]

(Patent Document)

Patent Document 1: Japanese Patent Application Laid-Open No. 10-47525

However, according to the previous solenoid valve shown in Figs. 12 and 13, when the solenoid 94 and the yoke member 95 are molded by the molded resin 96, the molded resin 96 will wrap around (wraparound) To the edge portion of the insertion hole 951 of the yoke member 95, both the yoke member 95 and the fixed iron core 91 are electrically insulated, and sufficient ground conduction cannot be ensured. In addition, it is difficult for the valve body to be coated with an insulating paint on the surface to prevent corrosion, etc., it is difficult to make the end of the magnetic circuit component abut the valve body to ensure ground conduction.

The embodiment of the present invention was developed to solve the above-mentioned problems, and its purpose is to provide a solenoid valve that can more reliably ensure grounding conduction.

In order to solve the above-mentioned problems, the solenoid valve of the present embodiment is characterized by having: a conductive valve body having a valve body and a housing for accommodating the valve body; a molded member having a cylindrical bobbin, The electromagnetic coil wound on the spool, the power plug connected to an external power source, and an insulating molded resin that molds part of the spool, the electromagnetic coil, and the power plug Molding; an insertion member having a movable iron core, a cylindrical fixed iron core, and a rod body, the movable iron core can be moved in the insertion direction relative to the mold member to penetrate the mold member, the fixed iron core The mold member is inserted so as not to move relative to the mold member in the insertion direction, and the movable iron core is attracted by the electromagnetic coil being energized. The rod body is inserted into the fixed iron core, and one end of the rod is connected to the The other end of the movable iron core is connected to the valve body; and, the yoke member has a cylindrical portion through which the molding member can be inserted, and is formed at both ends of the cylindrical portion and formed with a penetration member. The bottom of the inserted hole; wherein the power plug has a ground terminal connected to the ground wire of the external power supply, and the ground terminal is electrically connected to the yoke member.

In addition, the solenoid valve of the present embodiment is characterized by having: a conductive valve body having a valve body and a housing for accommodating the valve body; and a molded member having a spool formed in a cylindrical shape and wound An electromagnetic coil on the spool, a power plug connected to an external power source, and an insulating molded resin that molds a part of the spool, the electromagnetic coil, and the power plug; And, an insertion member having a movable iron core, a cylindrical fixed iron core, and a rod. The movable iron core can move in the insertion direction relative to the mold member to penetrate the mold member, and the fixed iron core cannot The mold member is inserted into the mold member so as to move relative to the mold member in the insertion direction, and the movable iron core is attracted by the energization of the electromagnetic coil. The rod is inserted into the fixed iron core, and one end of the rod is connected to the movable iron core. The iron core and its other end is connected to the valve body; wherein, the power plug has a ground terminal connected to the ground wire of the external power source, and the ground terminal is connected to the ground terminal provided on the inner peripheral wall of the spool The contact terminals abutted by the component are electrically connected.

According to the embodiment of the present invention, ground conduction can be ensured more reliably.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the valve body side in the moving direction of the movable iron core is regarded as the front, and the connection terminal (power plug) side in the vertical direction orthogonal to the moving direction of the movable iron core is regarded as the upper side.

(First Embodiment) First, the overall configuration of the solenoid valve of the first embodiment will be described. Fig. 1 is a schematic cross-sectional view showing the structure of the solenoid valve of the first embodiment. Fig. 2 is an exploded perspective view showing the structure of the solenoid valve of the first embodiment. In addition, in Fig. 1, the solenoid valve is shown as viewed from the side orthogonal to the moving direction and the vertical direction of the movable iron core, and a part of Fig. 1 is a cross-sectional view or a perspective view.

As shown in Figures 1 and 2, the solenoid valve 1 of this embodiment is a directional switching valve that controls the movement direction or forward and stop of a hydraulic actuator, and is equipped with an electromagnetic solenoid 3. The tube 3 has: a conductive valve body 2 including a valve body 22 and a housing 21 that houses the valve body 22; a mold member 4; a yoke member 5; an insertion member 6; and a nut member 7. In addition, in this embodiment, the housing 21 and the valve body 22 are made of metal, and the outer wall surface of the housing 21 is coated with insulating paint.

The molding member 4 includes: a bobbin 41 formed into a cylindrical shape through which the insertion member 6 can be inserted; an electromagnetic coil 42 wound on the bobbin 41; a power plug 43; and an insulating molded resin 44, which molds a part of the bobbin 41, the electromagnetic coil 42 and the power plug 43 into shape. In addition, in the mold member 4, the power plug 43 is provided so as to protrude in the outer diameter direction of the mold member 4. In addition, the bobbin 41 is formed to have a shape having a cylindrical portion, which is formed as a cylinder, and flanges, which are formed at both ends of the cylindrical portion so as to protrude in the outer circumferential direction of the cylindrical portion.

The yoke member 5, as a magnetic circuit constituent member, is formed as a cylindrical member capable of accommodating the mold member 4 and allowing the insertion member 6 to penetrate, and the yoke member 5 is made of a metal first yoke member 5a And the second yoke member 5b. The first yoke member 5a is a cylindrical member that has a bottom on the rear bottom surface in the moving direction of the movable iron core and is opened on the front bottom surface, and is formed so that a part of the power plug 43 is exposed to the outside To expose a part of the molded member 4. The second yoke member 5b is a member formed in the opening of the first yoke member 5a to form the bottom surface of the yoke member 5, and a hole through which the insertion member 6 can be inserted is formed. In the assembly of the solenoid valve 1, after the molding member 4 is inserted into the first yoke member 5a, the second yoke member 5b is fitted on the opening of the first yoke member 5a. At this time, the inner peripheral wall near the opening of the first yoke member 5a and the edge portion of the second yoke member 5b are in close contact and are electrically connected. In addition, the outer periphery of the molded member 4 inserted into the yoke member 5 is tightly joined to the inner wall of the yoke member 5 except for the place where the power plug 43 is provided.

The insertion member 6 includes a fixed iron core 61, a movable iron core 62, a cylindrical member 63, and an end plug member 64. The fixed iron core 61 is provided at the forefront of the insertion member 6 and is a cylindrical member that attracts the movable iron core 62 by the energization of the electromagnetic coil 42. The cylindrical member 63 is a cylindrical member that is open at the front end and is connected to the fixed iron core 61 and partitions the internal space together with the fixed iron core 61. In addition, a part of the cylindrical member 63 on the rear end side protrudes from the mold member 4 and the yoke member 5 in a state where the insertion member 6 penetrates the mold member 4 and the yoke member 5. The movable iron core 62 is inserted through the cylindrical member 63 and moved toward the valve body 22 side in the internal space by being sucked by the fixed iron core 61. In addition, at the front end of the movable iron core 62, a rod 621 extending forward is provided. The rod 621 penetrates the fixed iron core 61 and is connected to the rear end of the valve body 22. The end plug member 64 is inserted into the hole formed on the rear bottom surface of the cylindrical member 63 to close the internal space. In addition, in a state where the insertion member 6 is inserted through the mold member 4 and the yoke member 5, the outer peripheral wall of the fixed core 61 abuts the edge of the hole of the second yoke member 5b. In addition, since a part of the front side of the fixed iron core 61 is inserted into the housing 21, a part of its outer circumference is in electrical contact with the inner wall of the housing 21. In addition, the fixed iron core 61 may be configured to electrically contact the housing 21 via the valve body 22.

The nut member 7 is a cylindrical member penetrated by a part of the cylindrical member 63, and is screwed to the outer wall of the rear bottom surface of the first yoke member 5a on the front side, and is screwed to the cylindrical member 63 on the rear side. Part of the cylindrical member 63 protrudes from the molded member 4 and the yoke member 5 at the rear end of the cylindrical member. By these screwings, the insertion member 6 is fixed to the yoke member 5 and the mold member 4 inserted into the yoke member 5.

Next, the power plug 43 and contact terminals will be described. Fig. 3 is a side sectional view showing the structure of the mold member and the yoke member of the first embodiment. Fig. 4 is a diagram showing the structure of a leaf spring terminal. Figure 5 is a diagram showing the structure of a spike terminal. Fig. 6 is a diagram showing the structure of the spring terminal. Fig. 7 is a diagram showing the structure of the screw terminal. Figure 8 is a diagram showing the structure of the press-fit pin terminal.

As shown in FIG. 3, the power plug 43 has two power terminals 431a, 431b connected to an external power source, and a ground terminal 432 connected to the ground wire of the external power source. The power terminals 431a, 431b are each electrically connected to the electromagnetic coil 42 via conductive members 433a, 433b; the ground terminal 432 is electrically connected to the leaf spring terminal 45 as a contact terminal contacting the yoke member 5 via the conductive member 434 . The plate spring terminal 45 is provided on the front end of the bobbin 41, specifically, on the surface of the front flange of the bobbin 41 that faces the second yoke member 5b. The conductive members 433a, 433b and the conductive member 434 are molded together with the bobbin 41 and the electromagnetic coil 42 by molding the resin 44. The leaf spring terminal 45 is molded by a mold resin 44 so that at least the contact point with the second yoke member 5b is exposed to the outside, and only a part of it is molded.

As shown in Fig. 4, the leaf spring terminal 45 is a member formed by bending a thin plate-shaped and conductive metal sheet so as to be pressed against the contact surface of the contact object in the direction of the contact object. When the terminal 45 is molded in the molded resin 44, at least the contact surface and the place where the contact surface is pressed to generate elasticity are molded.

In this way, the leaf spring terminal 45 electrically connected to the ground terminal 432 abuts the second yoke member 5b, and the second yoke member 5b abuts the fixed iron core 61, whereby the ground terminal 432 passes through the conductive member 434 and the leaf spring The terminal 45, the second yoke member 5b, and the fixed iron core 61 are electrically connected to the housing 21. Therefore, the housing of the solenoid valve 1 is grounded.

In addition, instead of the plate spring terminal 45, other contact terminals may be used. For example, as the contact terminal, the pointed terminal 45a as shown in Fig. 5, the spring terminal 45b as shown in Fig. 6, the screw terminal 45c as shown in Fig. 7 and the one shown in Fig. 8 Press in the pin terminal 45d. The tip terminal 45a is a conductive member having a sharp portion facing the direction of the contact object. The spring terminal 45b is a conductive compression coil spring having a pressing force toward the contact object. The screw terminal 45c is a conductive screw member having a head and a screw part, and the screw part is inserted into the flange part of the spool 41 so that the head abuts the contact object, thereby functioning as a contact terminal. The press-fit pin terminal 45d is a conductive plug member having a pressing portion and a press-fitting part. The press-fitting part is pressed into the spool 41 so that the pressing part abuts against the contact object. The press-fit hole on the flange portion of the device functions as a contact terminal.

(Second Embodiment) Next, the configuration of the solenoid valve of the second embodiment will be described. The contact terminals of the solenoid valve of the second embodiment are provided at different positions compared to the solenoid valve of the above-mentioned first embodiment. Hereinafter, the description about the same configuration as the first embodiment is omitted, and the position of the contact terminal different from the first embodiment will be described. Fig. 9 is a side sectional view showing the structure of the mold member and the yoke member of the second embodiment.

As shown in Fig. 9, in the second embodiment, a plate spring terminal 45 as a contact terminal is provided on the rear end surface of the bobbin 41. Specifically, it is provided on the rear side flange of the bobbin 41 and The bottom surface of a yoke member 5a faces the other surface. The leaf spring terminal 45 is molded by a mold resin 44 so that at least the contact point with the first yoke member 5a is exposed to the outside, and only a part of it is molded. In addition, the leaf spring terminal 45 may be provided on the outer wall surface of the mold member 4 at a position facing the inner wall of the cylindrical portion of the first yoke member 5a. Furthermore, in the second embodiment, instead of the plate spring terminal 45, a pointed terminal 45a, a spring terminal 45b, a screw terminal 45c, or a press-fit pin terminal 45d may be used as the contact terminal.

In this way, the plate spring terminal 45 electrically connected to the ground terminal 432 is brought into contact with the first yoke member 5a, and the second yoke member 5b fitted to the first yoke member 5a is brought into contact with the fixed iron core 61, thereby grounding The terminal 432 is electrically connected to the housing 21 via the conductive member 434, the leaf spring terminal 45, the first yoke member 5a, the second yoke member 5b, and the fixed iron core 61. Therefore, the housing of the solenoid valve 1 is grounded.

(Third Embodiment)

Next, the structure of the solenoid valve of the third embodiment will be described. The contact terminals of the solenoid valve of the third embodiment are provided at different positions compared to the solenoid valve of the first and second embodiments described above. Hereinafter, the description of the same configuration as the first embodiment and the second embodiment will be omitted, and the position of the contact terminal different from the first embodiment and the second embodiment will be described. Fig. 10 is a side sectional view showing the structure of the mold member and the yoke member of the third embodiment.

As shown in Fig. 10, in the third embodiment, a plate spring terminal 45 as a contact terminal is provided on the inner peripheral wall surface of the bobbin 41, that is, is provided on the insertion member 6 to be inserted through. The inner peripheral wall of the hole. In addition, the leaf spring terminal 45 is provided at a position on the inner peripheral wall surface where the fixed iron core 61 is arranged when the insertion member 6 is inserted and fixed to the nut member 7. Therefore, one end of the conductive member 434 is connected to the ground terminal 432, a part of the conductive member 434 is along the inner peripheral wall surface of the spool 41 or penetrates the cylindrical part of the spool 41, and the other end is connected to the leaf spring terminal 45. In addition, when the cylindrical member 63 has conductivity, the position where the leaf spring terminal 45 is installed may be any place as long as it is the inner peripheral wall surface of the bobbin 41. Furthermore, in the third embodiment, instead of the plate spring terminal 45, a pointed terminal 45a, a spring terminal 45b, a screw terminal 45c, or a press-fit pin terminal 45d may be used as a contact terminal, as long as it does not interfere with the insertion member 6 The insertion of the molding member 4 is sufficient.

In this way, the plate spring terminal 45 electrically connected to the ground terminal 432 is brought into contact with the fixed iron core 61, whereby the ground terminal 432 is electrically connected to the housing via the conductive member 434, the plate spring terminal 45, and the fixed iron core 61 twenty one. Therefore, the housing of the solenoid valve 1 is grounded.

(Fourth Embodiment) Next, the configuration of the solenoid valve of the fourth embodiment will be described. Compared with the solenoid valves of the first to third embodiments described above, the solenoid valve of the fourth embodiment is different in that it is made to be grounded without passing through a contact terminal. Hereinafter, descriptions about the same configurations as the first to third embodiments are omitted, and descriptions about the configurations different from the first to third embodiments. Fig. 11 is a side sectional view showing the structure of a mold member and a yoke member of the fourth embodiment.

As shown in Fig. 11, in the fourth embodiment, one end is connected to the conductive member 434 of the ground terminal 432, and the other end is exposed to the outside from the yoke member 5 in the molded member 4. Specifically, The other end of the conductive member 434 is exposed to the outside of the mold member 4 from the vicinity of the place where the power plug 43 is installed. In addition, the exposed other end is connected to the outer peripheral wall surface of the yoke member 5. Specifically, the exposed other end is directly soldered and connected to the outer wall surface of the cylindrical portion of the first yoke member 5a. Here, the connection position of the other end is preferably near the power plug 43.

In this way, one end of the conductive member 434 is electrically connected to the ground terminal 432, and the other end is connected to the first yoke member 5a, whereby the ground terminal 432 passes through the conductive member 434, the first yoke member 5a, and the second yoke member 5a. The member 5b and the fixed iron core 61 are electrically connected to the housing 21. Therefore, the housing of the solenoid valve 1 is grounded.

According to the solenoid valve described above, for the conductive member whose one end is electrically connected to the ground terminal 432, the other end of the conductive member, or the contact terminal connected to the other end, is directly or indirectly electrically connected to the fixed iron core Therefore, the ground connection can be ensured without being electrically connected to the outer wall surface of the housing. Even if the outer wall is coated with insulating paint to prevent corrosion, when the conductivity of the outer wall of the casing decreases due to corrosion, the ground connection can be ensured more reliably. In addition, by electrically connecting the ground terminal to the housing via the insertion member, the degree of freedom of the position where the other end of the conductive member is exposed can be improved for the conductive member whose one end is electrically connected to the ground terminal. Even improve the design freedom of solenoid valves.

The embodiments of the present invention are examples and are not used to limit the scope of the invention. These novel embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and their changes are all included in the scope or gist of the invention, and are also included in the invention described in the scope of patent applications and their equivalent scope.

1: Solenoid valve

2, 8: Valve body

3, 9: electromagnetic solenoid

4.9a: Molded components

5.95: yoke member

5a: First yoke member

5b: Second yoke member

6, 9b: Insertion member

7: Nut member

21, 81: shell

22, 82: valve body

41, 93: Spool

42, 94: electromagnetic coil

43, 97: power plug

44, 96: Molded resin

45: plate spring terminal

45a: Tip terminal

45b: Spring terminal

45c: Screw terminal

45d: Press-in pin terminal

61, 91: fixed core

62, 92: Movable core

63: cylindrical member

64: End plug member

431a, 431b, 971a, 971b: power terminals

432, 972: ground terminal

433a, 433b, 434: conductive member

621: Rod

951: Through Hole

973a, 973b, 974: wire

Fig. 1 is a schematic cross-sectional view showing the structure of the solenoid valve of the first embodiment. Fig. 2 is an exploded perspective view showing the structure of the solenoid valve of the first embodiment. Fig. 3 is a side sectional view showing the structure of the mold member and the yoke member of the first embodiment. Fig. 4 is a diagram showing the structure of a leaf spring terminal. Figure 5 is a diagram showing the structure of the tip terminal. Fig. 6 is a diagram showing the structure of the spring terminal. Fig. 7 is a diagram showing the structure of the screw terminal. Figure 8 is a diagram showing the structure of the press-fit pin terminal. Fig. 9 is a side sectional view showing the structure of the mold member and the yoke member of the second embodiment. Fig. 10 is a side sectional view showing the structure of the mold member and the yoke member of the third embodiment. Fig. 11 is a side sectional view showing the structure of a mold member and a yoke member of the fourth embodiment. Fig. 12 is a schematic cross-sectional view showing the structure of a conventional solenoid valve. Fig. 13 is a front view showing the structure of a conventional molded member.

Domestic hosting information (please note in the order of hosting organization, date and number)

Foreign hosting information (please note in the order of hosting country, institution, date and number) None

(Please change the page to record separately) None

1: Solenoid valve

2: Valve body

3: Electromagnetic solenoid

4: Molded components

5a: First yoke member

5b: Second yoke member

6: Insertion member

7: Nut member

21: Shell

22: Valve body

41: Spool

42: Electromagnetic coil

43: power plug

44: Molded resin

45: plate spring terminal

61: fixed core

62: movable iron core

63: cylindrical member

64: End plug member

431a, 431b: power terminals

432: Ground terminal

433a, 433b, 434: conductive member

621: Rod

Claims (5)

A solenoid valve is characterized by having: a conductive valve body, which has a valve body, and a housing accommodating the valve body; a molded member, which has a spool formed in a cylindrical shape, and is wound on the spool An electromagnetic coil, a power plug connected to an external power source, and an insulating molded resin that molds the bobbin, the electromagnetic coil, and a part of the power plug; an insertion member, which It has a movable iron core, a cylindrical fixed iron core, and a rod. The movable iron core can move in the insertion direction relative to the mold member to penetrate the mold member, and the fixed iron core cannot be opposed to the mold member in the insertion direction. The movable manner of the mold member is inserted into the mold member and is energized by the electromagnetic coil to attract the movable iron core, the rod body is inserted through the fixed iron core, and one end of the rod is connected to the movable iron core and the other end is connected To the valve body; and, a yoke member having a cylindrical portion through which the molding member can be inserted, and a bottom portion formed at both ends of the cylindrical portion and having holes through which the penetration member can be inserted; Wherein, the power plug has a ground terminal connected to the ground wire of the external power source, and the ground terminal is electrically connected to the yoke member. The solenoid valve according to claim 1, wherein the aforementioned grounding The terminal is electrically connected to a contact terminal provided on the outer wall of the mold member, and the contact terminal abuts against the inner wall of the yoke member. The solenoid valve according to claim 2, wherein the contact terminal is provided at a position opposed to the bottom of the yoke member. The solenoid valve according to claim 2, wherein the contact terminal is provided at a position opposed to the cylindrical portion of the yoke member. The solenoid valve according to claim 1, wherein the ground terminal is electrically connected to the outer wall of the yoke member.

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