JP2000074247A - Solenoid valve and manufacture of it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a solenoid valve. SOLUTION: Seal layers 29 made of a resin are provided on interfaces among first to third cores 23 to 25, a fixing plate and a housing case 13. The thickness of each seal layer 29 is in the range of about 5 to 50 μm and very thin. Accordingly, it is not necessary to use parts such as a gasket in order to secure sealing performance of the interference among the first to third cores 23 to 25, the fixing plate and the housing case 13, and therefore, it is not necessary to secure the installation space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve and a method for manufacturing the same.

[0002]

2. Description of the Related Art The most common type of solenoid valve is a plunger type solenoid. This plunger type solenoid is composed of an electromagnetic coil having a magnet wire wound around the outer periphery of a bobbin, and a bobbin which is the center of the electromagnetic coil. It comprises a movable iron core inserted through the insertion hole, and a valve body having an orifice and piping means. Then, when the electromagnetic coil is excited, the movable iron core reciprocates while sliding on the inner peripheral surface of the insertion hole of the bobbin, so that the valve opens and closes. Here, the fluid flowing into the solenoid valve contains, for example, water and oil. Therefore, if this fluid flows through the components of the solenoid valve and flows into the solenoid coil side, there is a possibility that the insulation of the solenoid coil may be deteriorated. Therefore, conventionally, a gasket is provided on a bobbin of a component in order to prevent such a problem.

[0003]

In a conventional plunger type solenoid valve, a gasket or the like having rubber elasticity is provided to prevent fluid from flowing into the electromagnetic coil. Therefore, an extra space for installing the gasket is required. As a result, there has been a problem that the size of the entire solenoid valve is increased.

Further, recently, a swing type solenoid valve which is smaller than a plunger type solenoid valve is known. This electromagnetic valve is provided with a valve body having a plurality of ports, and an electromagnetic drive unit having an electromagnetic coil wound around a movable iron core. An accommodation space is formed at a joint portion between the valve body and the electromagnetic drive unit, and a valve body support flat plate is accommodated in the accommodation space. When the electromagnetic coil is excited, the communication of the port is switched by the swing of the valve body supporting plate. Even in such a swing type electromagnetic valve, it is necessary to employ a seal structure for preventing the fluid from flowing into the electromagnetic drive unit side without fail. However, if a gasket or the like is used as in the case of the plunger type solenoid valve, the entire swing type solenoid valve becomes large, and the feature of being a small solenoid valve cannot be fully utilized. Therefore, in the conventional solenoid valve, a seal structure which does not require the use of a gasket or the like has been desired.

The present invention has been made to solve the above problems, and an object thereof is to reduce the size of a solenoid valve.

[0006]

According to a first aspect of the present invention, a magnetic path component is connected to a valve body having a plurality of ports and a core around which an electromagnetic coil is wound, and the core, the electromagnetic coil and A valve body supporting member having a valve body in a housing space formed at a joint portion between the valve body and the electromagnetic drive section, the electromagnetic body comprising: The oscillating type electromagnetic valve which accommodates and oscillates the valve body support member by demagnetizing / exciting the electromagnetic coil to switch communication of the port, wherein a resin is provided at an interface between the magnetic path constituting member and the insulator. A sealing layer made of

With this configuration, when the electromagnetic coil is demagnetized / excited, the valve body supporting member swings due to the effect of the magnetic field generated in the electromagnetic coil. By moving the valve body in accordance with the swing, the communication of the ports is switched, and the fluid flows through the ports of the valve body. Here, a seal layer is formed at the interface between the magnetic path constituent material and the insulator. Therefore, the fluid from the valve body does not leak into the electromagnetic drive unit via the space between the magnetic path component and the insulator. Since the seal layer is extremely thin, it is possible to prevent fluid leakage without requiring an installation space such as a gasket. In addition, since the fluid from the valve body does not leak into the electromagnetic drive unit, the electromagnetic coil and the like of the electromagnetic drive unit do not suffer from electrical insulation deterioration. Therefore, the operation performance of the electromagnetic drive unit does not decrease.

According to a second aspect of the present invention, in the solenoid valve according to the first aspect, a movable member is connected to the valve body support member, and an attraction surface on which the movable member is attracted is formed by the magnetic path constituting member. And the seal layer is provided on the surface of the magnetic path component except for the attraction surface.

According to this configuration, the seal layer is provided on the surface of the magnetic path component except for the attraction surface. Therefore, the valve body supporting member is easily attracted to the attraction surface of the magnetic path component.
According to a third aspect of the present invention, in the solenoid valve according to the second aspect, the seal layer is formed by electrodeposition coating.

According to this configuration, since the seal layer is formed by electrodeposition coating, it is possible to form a uniform and thin seal layer. The invention according to claim 4 is the electromagnetic valve according to any one of claims 1 to 3, wherein a flange for determining a winding end position of an electromagnetic coil is provided at both ends of the core, The outer peripheral surface of the region where the electromagnetic coil is wound in the core is covered with an insulating member.

According to this configuration, the heat generated by the electromagnetic coil is transmitted to the core via the insulating member. Here, since the insulating member is directly coated on the outer peripheral surface of the core, the heat of the electromagnetic coil easily escapes to the core, and the heat dissipation of the electromagnetic coil increases.

According to a fifth aspect of the present invention, in the solenoid valve according to the fourth aspect, the insulating member is an insulating tape wound around an outer peripheral surface of a core. According to this configuration, the insulation between the core and the electromagnetic coil can be achieved by winding the insulating tape around the outer peripheral surface of the core.

According to a sixth aspect of the present invention, a magnetic path constituting member is connected to a valve body having a plurality of ports and a core on which an electromagnetic coil is wound, and the periphery of the core, the electromagnetic coil, and the magnetic path constituting member. And an electromagnetic drive unit covered with an insulator,
A valve body supporting member having a valve body is housed in a housing space formed at a joint portion between the valve body and the electromagnetic drive unit, and the valve body supporting member is rocked by demagnetization / excitation of the electromagnetic coil. In the method of manufacturing a swing type electromagnetic valve that performs communication switching of the port, a seal layer is electrodeposited on a surface of the magnetic path component, and a core, an electromagnetic coil, and a magnetic path component are set in a mold, After that, fill the mold with thermosetting resin,
An insulator covering the core, the electromagnetic coil and the magnetic path component is molded.

According to this method, the seal layer is electrodeposited on the surface of the magnetic path constituting material. Then, the magnetic path component, the core, and the electromagnetic coil are set in a mold. Thereafter, when the mold is filled with the thermosetting resin, the insulator covering the core, the electromagnetic coil, and the magnetic path component is molded. By this molding, the seal layer and the insulator are brought into close contact with each other. Therefore,
It is possible to seal between the magnetic path constituting material and the insulator without using a member such as a gasket.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a three-way valve type solenoid valve will be described below with reference to the drawings.

As shown in FIGS. 1 and 3, the electromagnetic valve 11 has an electromagnetic drive section 12 and its housing case (insulator).
Inside 13 is housed an iron core 14 as a core. A first electromagnetic coil 15 and a second electromagnetic coil 16 are wound around the core 14 in series at a predetermined interval.
The first electromagnetic coil 15 and the second electromagnetic coil 16 have the same winding direction and the same number of windings, and are wired in series along the longitudinal direction of the iron core 14. In this embodiment, the thickness of the housing case 13 is 5 mm.

As shown in FIG. 11, each of the electromagnetic coils 1
A polyester insulating tape T as an insulating member is adhered to the outer peripheral surface of the iron core 14 corresponding to the region where the windings 5 and 16 are wound. The outer peripheral surface of the core 14 corresponding to the region is covered by winding the insulating tape T several times two to three times along the longitudinal direction of the iron core 14. With the insulating tape T, electrical insulation between the iron core 14 and each of the electromagnetic coils 15 and 16 is achieved.

In this embodiment, the tape T
Has a thickness of 0.025 mm, and the thickness of the adhesive applied to the back surface of the tape T is 0.1 mm.
025 mm. That is, the total thickness of the tape T and the thickness of the adhesive is 0.05 mm. In addition, since the tape T is wound twice or three times as described above, the iron core 14 and each of the electromagnetic coils 15 and 16 are separated only by a small distance (about 0.15 mm). Absent.

As shown in FIGS. 1 and 3, at both ends of the iron core 14, flanges 1 made of synthetic resin are formed by insert molding.
7, 18 are provided. The winding end positions of the outer ends of the electromagnetic coils 15, 16 are determined by the flange portions 17, 18. Coil terminals 19 and 20 project from lower surfaces of the flange portions 17 and 18, and inner ends of the coil terminals 19 and 20 are electrically connected to the first and second electromagnetic coils 15 and 16.

Between the first electromagnetic coil 15 and the second electromagnetic coil 16, a mounting portion 21 made of synthetic resin is formed at the center of the iron core 14 by insert molding. The winding end positions of the inner ends of the electromagnetic coils 15 and 16 are determined by the mounting portion 21. An accommodation hole 21a is formed in an upper part of the mounting portion 21, and a permanent magnet 22 is accommodated in the accommodation hole 21a. The lower end surface of the permanent magnet 22 is in contact with the upper surface of the iron core 14. A first core 23 as a magnetic path component is accommodated in the accommodation hole 21 a of the attachment portion 21, and a lower end surface of the first core 23 is in contact with an upper end surface of the permanent magnet 22. The upper end surface of the first core 23 is a suction surface 23b at the center of the armature 51 described later. Then, as shown in FIG. 10, when the first electromagnetic coil 15 is energized, the direction of the magnetic field C generated by the first electromagnetic coil 15 is opposite to the direction of the magnetic field A generated by the permanent magnet 21. When the second electromagnetic coil 16 is energized, the direction of the magnetic field D generated by the second electromagnetic coil 16 becomes the same as the direction of the magnetic field B of the permanent magnet 21. Therefore, in the energized state, the magnetic field generated in the second core 24 is weaker than the magnetic field generated in the third core 25.

At both ends of the iron core 14 in the housing case 13, a second core 24 and a third core 25 are attached as magnetic path constituting members. The first core 23, the second core
The core 24 and the third core 25 are respectively sandwiched from both sides by a pair of concave fixing plates 27. Then, the fixed plates 27 and the first to third cores 23 to 25 are welded, whereby the respective cores 23 to 25 are respectively assembled.

The second and third cores 24 and 25 are formed with arms 24a and 25a, respectively, extending in opposite directions. Arm 24 in each core 24, 25
The upper surface of the distal end portion of each of the armatures 51 and 25a has an armature 51 described later.
Adsorption surfaces 24b and 25b at both ends are provided. And
The iron core 14, the first and second electromagnetic coils 15, 16 and the first to third cores 23 to 25 are set in a mold (not shown), and the mold is filled with an epoxy-based thermosetting resin material 26. . Then, the storage case 13 of the electromagnetic drive unit 12 is formed, and the periphery of the first and second electromagnetic coils 15 and 16 is covered with the epoxy-based thermosetting resin material 26. Thus, the first and second electromagnetic coils 15, 16
Is insulated.

As shown in FIG. 1, the first to third cores 2
A sealing layer 29 made of a resin is provided at the interface between 3 to 25 and the fixing plate 27 and the storage case 13. The thickness of the seal layer 29 is about 5 μm. 12, the seal layer 29 is formed on the surfaces of the first to third cores 23 to 25 and the fixing plate 27 by electrodeposition coating. However, the suction surface 2 of the first to third cores 23 to 25
The seal layer 29 is not formed in portions other than 3b to 25b. Further, a second portion which is in contact with both end surfaces of the iron core 14 is provided.
Also, the seal layer 29 is not formed on the inner surfaces of the third cores 24 and 25. Here, the electrodeposition coating means each core 24 to
An electric current is applied to the fixing plate 25 and the fixing plate 27, and the surface thereof is coated with a coating agent.

In this embodiment, the seal layer 29 is formed by electrodeposition coating using a cationic coating agent.
Therefore, there is an advantage that the coating strength of the seal layer 29 to the first to third cores 23 to 25 and the fixing plate 27 is ensured. At the same time, the compatibility with the epoxy-based thermosetting resin material 26 constituting the housing case 13 is good, and the sealing layer 29
There is an advantage that the adhesiveness between the container and the storage case 13 is also high.

As shown in FIGS. 1 and 2, a valve body 30 is provided in a housing case 13 of the electromagnetic drive unit 12 with a pair of screws 3.
1 are joined. Each screw 31 penetrates through an insertion hole 30 a formed at both ends of the valve body 30 and is screwed to the second and third cores 24 and 25, respectively. The joint space between the valve body 30 and the electromagnetic drive unit 12 includes a housing space 4.
0 is formed. A first port 33, a third port 35, and a second port 34 are formed in a straight line on the upper part of the valve body 30 in this order. The ports 33 to 35 communicate the outside of the electromagnetic drive unit 12 and the inside of the housing space 40. At the outer end of each port 33-35, a connection port 33a, 3
4a and 35a are respectively connected. Further, at the inner ends of the first and second ports 33 and 34 in the accommodation space 40, a first valve seat 33b and a second valve seat 34b having a central hole communicating with the ports 33 and 34 are formed. Have been.

In this embodiment, a fluid (for example, pressurized air) is supplied through the first port 33 to the storage space 40.
And the fluid is supplied into the storage space 40 through the second port 34. Further, by switching the communication between the first port 33 and the second port 34, the fluid is discharged from the accommodation space 40 through the third port 35 or supplied to the accommodation space 40.

As shown in FIGS. 1, 4 and 5, between the valve body 30 and the electromagnetic drive unit 12, an elastic and plate-shaped stainless steel spacer 41 is interposed. The screw 31 is penetrated through both ends of the spacer 41 via a screw through hole 42. The spacer 41 is strongly sandwiched between the joint portion between the valve body 30 and the electromagnetic drive section 12 by tightening the screw 31. Therefore, the valve body 3
0 and the strong driving force between the electromagnetic drive unit 12 and the spacer 4
Numeral 1 does not shift in the horizontal direction.

Gaskets 43 and 44 having a rectangular ring shape are attached to both upper and lower surfaces of the spacer 41 along the periphery of the housing space 40. Gaskets 43, 4
Reference numerals 4 are arranged at positions facing each other in the vertical direction.
When the valve body 30 and the electromagnetic drive unit 12 are joined, the upper gasket 43 is in close contact with the lower surface of the valve body 30, and one lower gasket 44 is connected to the electromagnetic drive unit 12.
Is closely attached to the upper surface. Due to this closeness, the accommodation space 4
The fluid fed into the valve body 30 and the electromagnetic drive unit 12
So that it does not leak out of the joint.
The two gaskets 43 and 44 are fixed by so-called lining bonding in which the spacer 41 is coated with a vulcanizing solution and bonded. Therefore, gasket 4
3 and 44 are firmly adhered to the spacer 41.

As shown in FIG. 6 and FIG.
1 is provided with a shell portion 47 that forms a square ring. Outer part 4
On the same plane as 7, a plate-shaped projection 48 is provided on the inner edge of the outer shell 47. As shown in FIGS. 8 and 9, the protrusion 48 is formed around its longitudinal axis.
It can be twisted and deformed in the left-right direction against its own elastic force.

A swinging piece 49 having a notch 49a is integrally formed at the tip of the projection 48. Therefore,
In this embodiment, the spacer 41 includes an outer shell 47,
It comprises a projection 48 and a rocking piece 49. And
The outer shell 47, the protrusion 48, and the rocking piece 49 are integrally formed by punching a single metal plate using a press die (not shown).

As shown in FIGS. 1, 2, and 4, an armature 51 as a movable member made of steel is provided on the lower surface of the swinging piece 49 of the spacer 41 in the housing space 40. A mounting protrusion 51 a is formed on the upper surface of the armature 51, and the mounting protrusion 51 a is fixed to the lower surface of the swinging piece 49 by laser welding. Armature 5
1 is formed such that its thickness decreases from the center toward both ends. A swing fulcrum 52 on the center lower surface of the armature 51 is supported in contact with the first core 23. The armature 51 can swing about a swing fulcrum 52. The gap piece 28 is fixed to the lower surface of one end of the armature 51 by welding. This gap piece 28 allows the armature 51
The magnetic force acting on the right end is slightly weaker than on the left end.

As shown in FIGS. 1, 2, 4 and 5, on the upper surface of the swinging piece 49 of the spacer 41 in the housing space 40, a stainless steel valve support as a valve support is provided. A flat plate 55 is provided. Valve support plate 55
A mounting portion 55a wider than both end portions is formed at the center of the rocking piece 49, and the mounting portion 55a is fixed to the upper surface of the oscillating piece 49 by laser welding. A first valve body 56 and a second valve body 57 are provided on the upper surfaces of both ends of the valve body support plate 55.
The two valve bodies 56 and 57 are fixed by so-called lining bonding, which is a state in which the vulcanizing liquid is coated on the valve body supporting plate 55 in a coated state.

Next, the solenoid valve 11 configured as described above
Will be described. In the non-energized state of FIG.
When the first and second electromagnetic coils 15 and 16 are energized, the attraction force of the left end of the armature 51 that is attracted to the attraction surface 24b of the second core 24 is greater than the elastic reaction force of the valve body supporting plate 55. become weak. Then, as shown in FIG. 2, the left end of the armature 51 is separated from the suction surface 24 b of the second core 24 by the elastic reaction force of the valve body supporting plate 55. At the same time, the right end of the armature 51 is the third core 25
Approaching the suction surface 25b. With this approach, the distance between the right end of the armature 51 and the suction surface 25b of the third core 25 decreases, and the right end of the armature 51 is suctioned to the suction surface 25b.

As a result, the armature 51 is swung,
As shown in FIG. 8, the swinging piece 49 swings in the same direction as the armature 51. At this time, the projection 48 supporting the armature 51 is twisted about the longitudinal axis against the elastic force of itself. Then, the valve body supporting plate 55 is in a state where the left side is warped from the center thereof (a state shown in FIG. 2), so that the first valve body 56 becomes the first valve seat 33 b of the first port 33.
Is pressed. As a result, port communication switching is performed, and the second port 34 and the third port 35 are communicated. Therefore, the fluid flowing into the storage space 40 from the connection port 34 a of the second port 34 flows into the connection port 3 of the third port 35.
Outflow from 5a.

When the first valve body 56 is pressed against the first valve seat 33b of the first port 33, the suction surface 25b of the third core 25 is attracted by the elastic reaction force of the valve body supporting plate 55. Of the armature 51 that has been used. However, this elastic reaction force is sufficiently smaller than the force at which the armature 51 is attracted to the suction surface 25b of the third core 25. Therefore, the first valve body 56 is pressed and held by the first valve seat 33 b of the first port 33.

When the first and second electromagnetic coils 15 and 16 are not energized in the energized state of FIG. 2, the attraction force of the right end of the armature 51 that is being attracted to the attraction surface 25b of the third core 25 is reduced. Due to the action of the gap piece 28, the elastic reaction force of the valve body supporting plate 55 becomes weaker. Then, as shown in FIG. 1, the right end of the armature 51 is separated from the suction surface 25 b of the third core 25 by the elastic reaction force of the valve body supporting flat plate 55. At the same time, the left end of the armature 51 approaches the suction surface 24b of the second core 24. With this approach, the distance between the left end of the armature 51 and the suction surface 24b of the second core 24 decreases, and the left end of the armature 51 is suctioned to the suction surface 24b.

As a result, the armature 51 is swung in the direction opposite to the direction when power is applied, and as shown in FIG. 9, the swinging piece 49 is swung in the direction opposite to the direction when power is applied. At this time, the projection 48 supporting the armature 51 is twisted in a direction opposite to the direction when the power is supplied, about the longitudinal axis against the elastic force of the projection 48. Then, the valve body support plate 55 is in a state in which the right side is warped from the center (a state shown in FIG. 1), and the second valve body 57 is pressed by the second valve seat 34 b of the second port 34. As a result, communication switching of the port is performed, and the first communication is performed.
The port 33 and the third port 35 are communicated. Therefore,
The fluid that has flowed into the storage space 40 from the connection port 35 a of the third port 35 flows out of the connection port 35 a of the first port 33.

In the state where the second valve body 57 is pressed against the second valve seat 34b of the second port 34, the elastic reaction force of the valve body supporting plate 55 acts to cause the suction surface 2 of the second core 24 to move.
An attempt is made to separate the armature 51 sucked by 4b. However, the elastic reaction force of the valve body supporting flat plate 55 is smaller than the force when the armature 51 is suction-held on the suction surface 24b of the second core 24, that is, smaller than the suction force.
The second valve body 57 is pressed and held by the second valve seat 34b of the port 34.

Here, the first valve body 56 and the second valve body 57
However, the pressing force when pressing against the first valve seat 33b or the second valve seat 34b is an elastic force due to the deformation of the valve body supporting plate 55. Therefore, the valve bodies 56 and 57 are pressed by the valve seats 33b and 34b with a sufficiently high pressing force, and there is no possibility that the fluid leaks.

During energization, heat generated in the first and second electromagnetic coils 15 and 16 is transmitted to the iron core 14 via the insulating tape T. Here, the insulating tape T is the iron core 1
4 is coated with an adhesive. And iron core 1
A small distance (about 0.15 mm) is provided between the electromagnetic coil 4 and each of the electromagnetic coils 15 and 16. Therefore, heat from each of the electromagnetic coils 15 and 16 easily escapes to the iron core 14,
The heat radiation of each of the electromagnetic coils 15 and 16 is improved. This suppresses a rise in the temperature of each of the electromagnetic coils 15 and 16, thereby suppressing a decrease in the value of the current flowing through the magnet wire. Therefore, the suction surfaces 23b of the first to third cores 23 to 25
It is possible to suppress a decrease in the attraction force of the armature 51 with respect to ２５25b.

Further, at the interface between the first to third cores 23 to 25 and the fixing plate 27 and the housing case 13, a seal layer 2 is provided.
9 sealed. Therefore, the fluid flowing into the storage space 40 does not enter the interface between the first to third cores 23 to 25 and the fixing plate 27 and the storage case 13. As a result, it does not reach the iron core 14 or the first and second electromagnetic coils 15 and 16 and does not fall out of the housing case 13. Therefore, the insulation between the iron core 14 and the first and second electromagnetic coils 15 and 16 does not deteriorate due to the fluid.

Next, the electromagnetic drive unit 12 in the electromagnetic valve 11
A method of manufacturing the device will be described. As shown in FIG. 13, the iron core 14 is set in a mold (not shown), and is filled with a synthetic resin with the mold closed, and the flanges 17, 18 and the mounting part 21 are insert-molded. As a result, the flanges 17 and 18 are integrally formed at both ends of the iron core 14, and the mounting portion 21 is formed at the center of the iron core 14. Then, the collar 17,
An insulating tape T is wound around the outer peripheral surface of the iron core 14 excluding the portion corresponding to the mounting portion 18 and the mounting portion 21. The insulating tape T is wound spirally along the longitudinal direction of the iron core 14. After the winding is completed, the first and second electromagnetic coils 15 and 16 are wound around an area between the flanges 17 and 18 and the mounting portion 21.
In this embodiment, each of the electromagnetic coils 15 and 16 includes:
A magnet wire having a rated voltage of 24 VDC and a diameter of 0.05 mm is wound 4000 times each, 8000 times in total.

At the time of winding the magnet wire,
The closer to the end of the magnet wire, the greater the winding force applied to the iron core 14. However, the distance between the iron core 14 and each of the electromagnetic coils 15 and 16 is extremely small (about 0.15 m).
m). Therefore, although the magnet wire is wound around the iron core 14 via the insulating tape T, it is substantially equivalent to directly winding the magnet wire around the hard iron core 14.

Subsequently, a pair of fixing plates 27 are fixed to both sides of the first core 23, the second core 24, and the third core 25 by welding at predetermined intervals. Thereby, the first to third cores 23 to 25 are assembled. Thereafter, on the surfaces of the first to third cores 23 to 25, the inner surfaces of the cores 23 to 25 and the portions excluding the suction surfaces 23b to 25b are subjected to electrodeposition coating. By this electrodeposition coating, FIG.
As shown by the diagonal lines in the figure, a very thin seal layer 2 of about 5 μm
9 are formed uniformly.

The two electromagnetic coils 1 manufactured as described above
The first to third cores 23 to 25 are assembled to 5, 16 and the like.
By this assembling, the inner surfaces of the second and third cores 24 and 25 come into contact with both end surfaces of the iron core 14. Then, the electromagnetic coils 15 and 16 and the first to third cores 2 are placed in a mold (not shown).
Set 3 to 25. Thereafter, the mold is closed, and the mold is filled with an epoxy-based thermosetting resin material 26 as a thermosetting resin. Thereby, the electromagnetic coils 15, 16 and the first to
The storage case 13 that covers the third cores 23 to 25 and the like is molded. The bonds between molecules between the cores 23 to 25, the electrodeposition coating, and the epoxy-based thermosetting agent 26 are strong.

Therefore, according to this embodiment, the following effects can be obtained. (1) In the solenoid valve 11 of this embodiment, the first
To the third cores 23 to 25, the fixing plate 27, and the housing case 1
A seal layer 29 made of a resin is provided at the interface with the third. The thickness of the seal layer 29 is about 5 μm, which is extremely thin. Therefore, in order to secure the sealing performance at the interface between the first to third cores 23 to 25 and the fixing plate 27 and the housing case 13, it is not necessary to use a component such as a gasket, and it is necessary to secure the installation space. There is no. Therefore,
The solenoid valve can be downsized.

(2) In the solenoid valve 11 of this embodiment, the first to third cores 23 to 25 and the fixed plate 27
A sealing layer 29 made of resin is provided on the interface with the housing case 13.
Is provided. Therefore, the fluid that has flowed into the storage space 40 includes the first to third cores 23 to 25 and the fixing plate 27,
It can be prevented from reaching the iron core 14 and the first and second electromagnetic coils 15 and 16 via the interface with the storage case 13.
Accordingly, since the insulation between the iron core 14 and each of the electromagnetic coils 15 and 16 does not deteriorate due to the fluid, the operation performance of the electromagnetic drive unit 12 can be prevented from being lowered.

(3) In the solenoid valve 11 of this embodiment, the seal layer 29 is formed by electrodeposition coating. Therefore, the seal layer 29 can be formed thinly and uniformly. (4) In the solenoid valve 11 of this embodiment, the seal layer 29 is formed using a cationic coating agent. Therefore, it is possible to secure sufficient coating strength on the seal layer 29 with respect to the first to third cores 23 to 25 and the fixing plate 27. Therefore, it is possible to form the seal layer 29 that is difficult to peel off.

(5) In the solenoid valve 11 of this embodiment, the seal layer 29 is formed using a cationic coating agent. For this reason, the compatibility with the epoxy-based thermosetting resin material 26 constituting the housing case 13 is good, and the sealing layer 29 and the housing case 13 can be strongly bonded. Thereby, the first to third cores 23 to 25 and the fixing plate 27
Then, no air layer is formed at the interface with the storage case 13. As a result, the first and second electromagnetic coils 15, 1
6 easily escapes through the first to third cores 23 to 25, the fixing plate 27, and the storage case 13. Accordingly, the heat dissipation coefficient (W / m2K) of each of the electromagnetic coils 15 and 16 is increased, and the temperature rise of each of the electromagnetic coils 15 and 16 is suppressed to a low level. be able to.

(6) In the solenoid valve 11 of this embodiment, an extremely thin insulating tape T is provided on the outer peripheral surface of the iron core 14 corresponding to the region where each of the electromagnetic coils 15 and 16 is wound.
Is glued. Thereby, the distance (about 0.15 mm) between the iron core 14 and each of the electromagnetic coils 15 and 16 can be shortened. Therefore, heat from each of the electromagnetic coils 15 and 16 easily escapes to the iron core 14, and each of the electromagnetic coils 15, 1
6 can be improved in heat dissipation. Therefore, it is possible to more reliably prevent the operation performance of the electromagnetic drive unit 12 from being lowered.

(7) In the electromagnetic valve 11 of this embodiment, the distance between the iron core 14 and each of the electromagnetic coils 15 and 16 is extremely small. Therefore, although the magnet wire is wound around the iron core 14 via the insulating tape T, it is substantially equivalent to directly winding the magnet wire around the hard iron core 14. Therefore, it is possible to sufficiently withstand the winding force of the magnet wire, and it is easy to control the winding tension. Therefore, the size of the electromagnetic drive unit 12 can be reduced.

(8) In the method of manufacturing the solenoid valve 11 of this embodiment, the first to third cores 23 to 25 have the sealing layer 2
9 is electrodeposited. And each core 23-25, iron core 1
4. Set the electromagnetic coils 15 and 16 in a mold (not shown). After that, the mold was filled with the epoxy-based thermosetting resin material 26, and an insulator covering the core, the electromagnetic coil, and the magnetic path component was molded. Therefore, the interface between the first to third cores 23 to 25 and the fixing plate 27 and the housing case 13 can be sealed by a simple and low-cost method.

The embodiment of the present invention may be modified as follows. In the above-described embodiment, the seal layer 29 is formed on the surfaces of the first to third cores 23 to 25 by electrodeposition coating. In addition to the electrodeposition coating, the seal layer 29 may be formed by, for example, electrostatic coating. .

In the above embodiment, the outer peripheral surface of the iron core 14 is covered with the insulating tape T, but may be coated with a resin having a thickness of about 0.5 mm. In the above-described embodiment, the seal layer 29 is formed using a cationic coating agent. However, other than the cationic coating agent, for example, an anionic coating agent may be used.

In the above embodiment, the first to third cores 23
Electrodeposition coating was performed on the surfaces of the surfaces 25 to 25 except for the suction surfaces 23b to 25b. In addition to this method, each core 2
Electrodeposition coating on the entire surface of 3 to 25
The coating of the portion corresponding to b to 25b may be removed later.

In the above-described embodiment, the thickness of the seal layer 29 is set to about 5 μm. However, the seal layer 29 can be implemented in a range of 5 to 50 μm as much as possible.
It is preferred to be μm.

Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiment will be listed below together with their effects. (1) The solenoid valve according to claim 3, wherein the electrodeposition coating is performed using a cationic coating agent.

According to this configuration, it is possible to form a seal layer that is difficult to peel off. (2) The solenoid valve according to claim 5, wherein the flange is provided on the core by insert molding.

According to this configuration, the flange can be easily formed. (3) A valve body having a plurality of ports, and an electromagnetic drive unit having an electromagnetic coil wound around a core, and a valve body is provided in a housing space formed at a joint portion between the valve body and the electromagnetic drive unit. A oscillating solenoid valve that accommodates a valve body supporting member having: and demagnetizes and excites the electromagnetic coil to oscillate the valve body supporting member to switch the communication of the port.
An electromagnetic valve, wherein a flange portion for determining a winding end position of the electromagnetic coil is provided at both ends of the core, and an outer peripheral surface of a region where the electromagnetic coil is wound in the core is covered with an insulating member.

According to this configuration, since the heat of the electromagnetic coil is easily radiated, it is possible to prevent the operating performance of the electromagnetic drive unit from being lowered.

[0061]

The present invention is configured as described above, and has the following effects. According to the first aspect of the invention, the size of the solenoid valve can be reduced.

According to the second aspect of the present invention, it is possible to prevent the operation performance of the electromagnetic drive unit from being lowered. According to the third aspect of the present invention, a uniform and thin seal layer can be formed.

According to the fourth aspect of the invention, since the heat of the electromagnetic coil is easily dissipated, it is possible to prevent the operation performance of the electromagnetic drive unit from being lowered. According to the fifth aspect of the present invention, since the insulating member is formed of a highly versatile insulating tape, the electromagnetic drive unit can be easily manufactured at low cost.

According to the sixth aspect of the present invention, the electromagnetic drive section can be easily manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a solenoid valve when power is not supplied.

FIG. 2 is a cross-sectional view of the solenoid valve in an energized state.

FIG. 3 is a perspective view showing the internal structure of an electromagnetic drive unit.

FIG. 4 is an exploded perspective view of a solenoid valve.

FIG. 5 is a perspective view in which a valve body supporting flat plate and an armature are attached to a spacer.

FIG. 6 is a perspective view showing a state before a valve body support flat plate is attached to a spacer.

FIG. 7 is an enlarged perspective view of a main part showing a swinging piece and the like of a spacer.

FIG. 8 is an enlarged perspective view of a main part of a spacer when power is not supplied.

FIG. 9 is an enlarged perspective view of a main part of a spacer at the time of energization.

FIG. 10 is an explanatory diagram showing the direction of a magnetic field.

FIG. 11 is an exemplary perspective view showing a state where an insulating tape is wound around an iron core;

FIG. 12 is a perspective view showing assembling of first to third cores.

FIG. 13 is a perspective view illustrating a manufacturing process of the electromagnetic drive unit.

[Explanation of symbols]

12: electromagnetic drive unit, 13: housing case (insulator), 14
... Iron core (core), 22 ... Permanent magnet, 23 ... First core (magnetic path component), 23b ... Adsorption surface, 24 ... Second core (magnetic path component), 24b ... Adsorption surface, 25 ... Third core (Magnetic path constituent material), 25b: adsorption surface, 26: epoxy thermosetting resin material (thermosetting resin), 29: seal layer, 30: valve body, 3
DESCRIPTION OF SYMBOLS 3 ... 1st port, 34 ... 2nd port, 35 ... 3rd port, 40 ... Housing space, 51 ... Armature (movable member), 55 ... Valve support plate (valve support member), 56 ... 1st valve , 57: second valve element, T: insulating tape.

Claims (6)

[Claims] A magnetic path component is connected to a valve body having a plurality of ports and a core around which an electromagnetic coil is wound,
An electromagnetic drive unit in which the periphery of the core, the electromagnetic coil, and the magnetic path component are covered with an insulator; and a valve body in a housing space formed at a joint between the valve body and the electromagnetic drive unit. A oscillating solenoid valve that accommodates a valve body supporting member having the same and that switches the communication of the port by swinging the valve body supporting member by demagnetizing and exciting the electromagnetic coil; Solenoid valve with a seal layer made of resin at the interface with the body. 2. A movable member is connected to the valve body support member, an adsorbing surface on which the movable member is adsorbed is formed on the magnetic path constituting member, and the seal layer is formed on the magnetic path excluding the adsorbing surface. The solenoid valve according to claim 1, which is provided on a surface of a component. 3. The solenoid valve according to claim 2, wherein said seal layer is formed by electrodeposition coating. 4. A flange for determining a winding end position of the electromagnetic coil is provided at both ends of the core, and an outer peripheral surface of a region where the electromagnetic coil is wound in the core is covered with an insulating member. The solenoid valve according to claim 1. 5. The solenoid valve according to claim 4, wherein said insulating member is an insulating tape wound around an outer peripheral surface of a core. 6. A valve body having a plurality of ports, and a magnetic path component is connected to a core around which an electromagnetic coil is wound,
An electromagnetic drive unit in which the periphery of the core, the electromagnetic coil, and the magnetic path component are covered with an insulator; and a valve body in a housing space formed at a joint between the valve body and the electromagnetic drive unit. A method of manufacturing a swing type electromagnetic valve that accommodates a valve body support member having the valve and swings the valve body support member by demagnetizing / exciting the electromagnetic coil to switch communication of the port. Electrodepositing a seal layer on the surface of the material, core,
Set the electromagnetic coil and magnetic path components in the mold, then
A method for manufacturing an electromagnetic valve, wherein a thermosetting resin is filled in a mold, and an insulator covering the core, the electromagnetic coil, and the magnetic path component is molded.