JPH11118059A - Solenoid for solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability of a solenoid part for constituting a solenoid valve. SOLUTION: A solenoid assembly 26 for constituting a solenoid for solenoid valve is sealed by a resin molded part 27, and the resin molded part 27 is provided with a connecting end surface 27a to be connected to a valve block part 11, an outer end surface 27b on the opposite side to it, and four side surfaces. Each side surface is so inclined as to be extended from the connecting end surface 27a toward the outer end surface 27b. therefore, the solenoid assembly 26 to be incorporated in the resin molded part 27 is sealed in the relatively thickened resin molded part 27. Moreover, mold opening and mold trimming are facilitated when the resin molded part 27 is formed by using a metal mold such as an injection molding metal mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve solenoid in an electromagnetic valve in which a directional control valve for changing the opening and closing of a fluid flow path and the direction of flow is operated by an electromagnet.

[0002]

2. Description of the Related Art A directional control valve such as a switching valve or a check valve is used for flowing air to a pneumatic pipe, stopping the flow, or changing the direction of the flow. The type in which the valve element is operated by an electromagnet is called an electromagnetic valve.

[0003] The solenoid valve has a direct-acting type in which the opening and closing and the direction of the flow are directly changed by a valve body operated by an electromagnet, and an internal pilot valve is driven by an electromagnet and the output of the pilot valve causes the valve body of the main valve to be operated. There is an indirect operation type of a type in which the direction of a flow path is controlled by operation.

The switching valve includes a two-port valve having two ports of an air input port and an output port, a three-port valve having three ports of a supply port, an output port, and an exhaust port, and a supply port and two output ports. And an exhaust port, and a 5-port valve having two output ports and two exhaust ports in addition to the supply port.

[0005] Such an electromagnetic valve usually has a valve block for controlling a flow path and a solenoid for operating a valve element incorporated therein. There are a lead wire type, a terminal type, and an insertion plug type as an electrical connection type connected to an electromagnet, that is, a solenoid.

The lead wire type is a connection type in which a solenoid portion and a lead portion are molded at the same time. A grommet is attached to a leading end of a power supply cable, and the grommet is partially embedded in a resin molding portion. Become. The terminal type includes a terminal terminal block to which a crimp terminal such as a round plate terminal is attached, and a terminal type which is usually called a DIN terminal and has a pin plug and a DIN socket. The plug-in type is a type in which a connector pin is built in a solenoid portion and a connector with a lead wire is inserted into the connector pin.

[0007] For the structure of the electromagnet, that is, the solenoid, in such a solenoid valve, see, for example, “New Edition Hydraulic and Pneumatic Handbook” No. 473, published on February 25, 1989 by Ohmsha.
Page 478.

[0008]

The basic structure of the solenoid portion of the solenoid valve is the same for both the indirect-acting type and the direct-acting type, and is the same for the solenoid valve having any number of ports. The structure of the solenoid portion is more complicated than that of the valve block portion forming the solenoid valve, and the manufacturing thereof requires many steps for assembling and molding the solenoid.

Further, when the solenoid portion is formed by sealing with a resin molded portion in a state in which various members such as a magnetic frame and a bobbin are incorporated, the thickness is increased in consideration of the strength of the resin molded portion. However, in order to obtain a small electromagnetic valve, the size of the solenoid must be reduced, and there is a limit to increasing the thickness of the resin molded portion.

It is an object of the present invention to improve the strength of a resin molded part while achieving downsizing of an electromagnetic valve.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0012]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the solenoid valve solenoid of the present invention comprises:
A solenoid valve solenoid that is attached to a valve block in which a valve element is incorporated, and operates the valve element, wherein a coil is wound around the outside, and a movable core is mounted inside so as to be slidable in the axial direction, A solenoid assembly having a magnetic frame into which the bobbin is incorporated, a quadrilateral connection end face connected to the valve block, and a quadrilateral outer end face opposite to the connection end face are formed; And a dimension of the outer end face is formed larger than a dimension of the connection end face, and a side face of the resin molding portion is inclined from the connection end face side to the outer end face. It is characterized by having made it.

In the present invention, since the side surface of the resin molded portion is inclined, the volume of the resin portion inside the resin molded portion can be increased without increasing the overall shape of the solenoid valve. Can be. In addition, when the resin molded portion is molded using a mold, the mold can be easily removed or opened, and the production efficiency can be improved.

In the solenoid valve solenoid according to the present invention, two of the four side surfaces of the resin molded portion which are opposed to each other may be inclined, and each of the four side surfaces of the resin molded portion is inclined. You may make it do.
Further, the respective inclination angles may be set to 0.5 to 1 degree.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a solenoid valve incorporating a solenoid according to an embodiment of the present invention.
FIG. 2A is a front view showing the external shape of FIG.
(B) is a plan view of the same figure (A).

As shown, the solenoid valve 10 has a valve block 11 and a solenoid 12. The valve block 11 has a substantially rectangular parallelepiped shape formed of an aluminum alloy or a resin, and a through hole 14 is formed therein. A cover 15 having a tubular portion 15a fitted into the through hole 14 is attached to one end of the valve block portion 11, and one end of the through hole 14 is closed.

The valve block 11 has a through hole 14 and a cylindrical portion 1.
5a form a valve element housing hole 16. The illustrated solenoid valve is a three-port solenoid valve, and has a supply port 17 to which compressed air is supplied from the outside, an output port 18 for allowing the air supplied here to flow to the pneumatic device, and discharge from the pneumatic device. An exhaust port 19 for guiding air to the outside is formed so as to communicate with the valve housing hole 16. The exhaust port 19 communicates with the inside of the valve body housing hole 16 through a plurality of holes 15b formed in the cylindrical portion 15a.

A main valve shaft 20 is slidably mounted in the valve body receiving hole 16 in the axial direction. A supply port 17 and an output port 18 communicate with a central portion of the main valve shaft 20. In addition, the position where the communication between the output port 18 and the exhaust port 19 is cut off, and the communication between the supply port 17 and the output port 18 as shown in FIG.
A valve body 21 is provided for controlling switching between a position where the valve 8 communicates with the exhaust port 19. Although the valve element 21 is of a poppet type, a spool type main valve may be provided, and the present invention is not limited to three ports but may be five ports.

At both ends of the main valve shaft 20, seal portions 22 and 23 are provided which are in sliding contact with the inner peripheral surface of the valve body housing hole 16, and the valve body housing hole 16 and the outside are sealed. . A compression coil spring 24 is provided between the cover 15 and the main valve shaft 20.
The main valve shaft 20 always has a supply port 1
7, a spring force in the direction of closing is applied. This cover 15 may be made of metal or resin.

The solenoid section 12 includes a solenoid assembly 26.
And a resin molded part 27 for sealing this. The solenoid assembly 26 has two flanges 2 at both ends of a cylindrical portion 28a.
It has a bobbin 28 provided with 8b and 28c, and a coil 29 is wound around the outside of the cylindrical portion 28a. The bobbin 28 is incorporated in a magnetic frame 31 made of a magnetic material having a quadrangular frame shape as shown in FIG. The magnetic frame 31 is formed by bending a strip-shaped iron plate cut into a predetermined shape.

A fixed core 32 is incorporated in the bobbin 28 on the valve block side, and a movable core 33 is mounted on the opposite side of the fixed core 32 so as to be slidable in the axial direction. The movable core 33 protrudes from the core body 34 and the front end thereof, and penetrates through a through-hole formed in the fixed core 32 to form the main valve shaft 2.
An operating rod 35 is in contact with the end surface of the main body 34. A spring force toward the main valve shaft 20 is urged on the operating rod 35 by a compression coil spring 36 incorporated in the core body 34. An accommodation hole for accommodating the spring 36 is closed by an end plate 37.

A printed wiring board 41 is mounted on the magnetic frame 31 of the solenoid assembly 26 via a holder 40 in order to supply electric power to the coil 29 from outside, and a power supply cable 42 connected to the board 41 is provided. The lead terminals 29 a of the coil 29 are electrically connected to each other via a power supply controller 43 such as a diode provided on the substrate 41. A grommet 51 made of rubber, resin, or the like is attached to the attachment end of the power supply cable 42.

As shown in FIG. 1, a cover 54 is attached to an end face of the solenoid assembly 26. The cover 54 is manually operated by an elastically deformable flexible resin or the like. An operation cap 55 is incorporated. The cap 55 is opposed to the end face of the movable core 33. By pressing the cap 55, the main valve shaft 20 can be operated manually without energizing the coil 29.

A metal magnetic ring 56 having a flange portion and a cylindrical portion is fitted into one end of the bobbin 28.

As shown in the figure, the resin molding portion 27 has a substantially rectangular parallelepiped shape as a whole, and has one end face on the valve block 1 side.
1 and a quadrilateral outer end face 27b opposite to the quadrilateral connection end face 27a.
Four side surfaces 2 between these end surfaces 27a, 27b
Upper and lower two side surfaces 27 facing each other among 7c to 27e
c and 27d are formed so as to be inclined so that the mutual dimension increases from the connection end face 27a toward the outer end face 27b. Similarly, the two front and rear side surfaces 27e and 27f facing each other are connected to the outer end surface 2 from the connection end surface 27a.
7b, they are formed so as to be inclined so that the size between them becomes larger. Thereby, the outer end surface 27
The dimension of b, that is, the vertical dimension and the longitudinal dimension in FIG.
The connection end face 27a is formed to be larger than a similar dimension.

Therefore, each side surface 27c-27
f is the front and rear side surfaces 27e and 27f with respect to the imaginary side surface of a rectangular parallelepiped shape that is straight from the side surface of the valve block 11.
Is inclined by an angle α, and similarly the upper and lower side surfaces 27c and 27d
Is inclined by the angle β. The respective angles α and β
May be set to the same angle or different. In the case shown, the respective inclination angles are set to about 0.5 to 2 degrees.

In order to manufacture the above-described solenoid portion 12, first, a bobbin 28 around which a coil 29 is wound is assembled in a magnetic frame 31, and a metal magnetic ring 56 is inserted into an end of the bobbin 28 to thereby form a solenoid. Assemble the assembly 26.

Next, as shown in FIG.
And the substrate 41 on which the power supply cable 42 is assembled,
The holder 40 is assembled to the magnetic frame 31 of the solenoid assembly 26. Thus, the substrate 41 is temporarily fixed to the magnetic frame 31. In this state, first, the tip of the lead terminal 29a is brazed to a predetermined position on the printed wiring board, and then the solenoid assembly 26 is disposed in the resin molding die. By injecting resin into the mold while the mold is tightened,
With this resin, the resin molding portion 27 is molded into the shape shown in the figure.

At the time of injection molding using the molten resin, that is, at the time of molding, the resin enters the gap between the coil 29 and the magnetic frame 31, and a part of the substrate 41 and the grommet 51 is embedded with the resin forming the resin molded portion 27. It is. The substrate 41 is covered with the resin molding 27 including a power supply controller such as a diode provided on the substrate 41.

The inner surface of the mold for injection molding for molding the resin molding portion 27 is formed by the inclined side surface 27 c of the resin molding portion 27.
To 27f. When the mold is opened after the resin injected into the mold is cured, the four side faces are inclined. The operation of removing from the mold can be easily performed.

After the resin molded portion 27 is formed in this manner, the fixed core 32 and the movable core 33 are
The assembly of the solenoid portion 12 is completed. The solenoid unit 12 and the valve block unit 11 are connected to each other by using a screw member, and the cover 54 is screwed to complete the assembly of the solenoid valve 10 shown in FIG. When the solenoid valve 10 is used, it is installed at a predetermined position by the mounting bracket 57.

In the case shown in the figure, the solenoid unit 1
Although all four side surfaces 27c to 27f of the second resin molded portion 27 are inclined, the two side surfaces 27c facing each other are inclined.
c, 27d only, or the other 2
Only the two side surfaces 27e and 27f may be inclined.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above-described embodiment and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, as the structure of the solenoid valve, a direct-acting solenoid valve is shown in the drawing, but the solenoid of the present invention may be applied to an indirect-acting solenoid valve.
Although the electrical connection system in the illustrated solenoid unit 12 is a lead wire system using a grommet, the present invention can of course be applied to a solenoid system of a terminal system or a plug-in connection system. .

[0037]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) Since the side surface of the resin molded portion is inclined, the volume of the resin portion inside the resin molded portion can be increased without increasing the overall shape of the solenoid valve. The strength of the resin molding can be improved.

(2) Since the side surface of the resin molded portion is inclined, it is easy to remove or open the mold when molding it using a mold, and to improve the production efficiency. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electromagnetic valve provided with an electromagnetic valve solenoid according to an embodiment of the present invention.

2A is a front view showing the appearance of the solenoid valve shown in FIG. 1, and FIG. 2B is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Valve block part 12 Solenoid part 15 Cover 16 Valve body accommodation hole 17 Supply port 18 Output port 19 Exhaust port 20 Main valve shaft 21 Valve body 26 Solenoid assembly 27 Resin molding part 27a Connection end face 27b Outer end face 27c- 27f side surface 28 bobbin 29 coil 29a lead terminal 31 magnetic frame 32 fixed core 33 movable core 34 core body 35 operating rod 36 compression coil spring 40 holder 41 printed wiring board (substrate) 42 power supply cable 43 power supply controller 51 grommet

Claims (4)

[Claims] 1. A solenoid valve solenoid mounted on a valve block in which a valve element is incorporated and operating the valve element, wherein a coil is wound on the outside and a movable core is slidable in the axial direction on the inside. A bobbin to be mounted, a solenoid assembly having a magnetic frame into which the bobbin is incorporated, a quadrilateral connection end face connected to the valve block, and a quadrilateral outer end face opposite to the connection end face are formed. A resin molded portion that seals the solenoid assembly, wherein a dimension of the outer end surface is formed larger than a dimension of the connection end surface, and a side surface of the resin molded portion is formed on the outer side from the connection end surface side. An electromagnetic valve solenoid characterized by being inclined toward an end face. 2. The solenoid valve solenoid according to claim 1, wherein two of the four side surfaces of said resin molded portion which are opposed to each other are inclined. 3. The solenoid valve solenoid according to claim 1, wherein each of four side surfaces of said resin molded portion is inclined. 4. The solenoid valve solenoid according to claim 1, wherein an inclination angle of said side surface is set to a predetermined value.
An electromagnetic valve solenoid characterized by being set at 0.5 to 2 degrees.