JPH11118058A - 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 valve assembly 26 for constituting a solenoid for solenoid valve is provided with a bobbin 28 on which a coil 29 is wound and in which a movable core 33 is so mounted as to be slid in the axial direction, and a magnetic frame 31 in which this bobbin 28 is to be incorporated. A holder 40 is attached to the magnetic frame 31, a lead terminal 29a of the coil 29 and a power feeding cable 42 are connected to each other, and a feed power controller 43 is provided between the power feeding cable 42 and the lead terminal 29a. A grommet 51 is provided on a connecting terminal of the power feeding cable 42, and the base plate 41 of the solenoid assembly 26, and a part of the grommet 51 are sealed by a resin molded part 27.

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.

For this reason, it is necessary to reduce the number of parts constituting the solenoid part and to improve the assembling workability.

An object of the present invention is to improve the workability of assembling a solenoid portion constituting a solenoid 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 in which the bobbin is incorporated, mounted on the magnetic frame via a holder, connected to a lead terminal of the coil and a power supply cable, and provided between the power supply cable and the lead terminal. A substrate provided with a power supply controller, a grommet provided at a connection terminal of the power supply cable, and a resin molded part that seals the solenoid assembly together with a part of the substrate and the grommet, A substrate is embedded in the resin molded part.

In the present invention, since the substrate is sealed by the resin molded portion, the substrate can be mounted simultaneously with the molding of the resin molded portion, and the assemblability of the solenoid is improved. .

If the surface of the substrate and the power supply controller are covered with a heat-resistant resin before the resin molding section is molded with the resin, the heat of the molten resin is applied when the resin molding section is molded with an injection mold. Damage to the power supply controller is prevented. In addition, the holder is engaged with the magnetic frame, and the substrate is engaged with the holder, and the substrate is attached to the magnetic frame via the holder, thereby soldering the substrate and the lead terminals of the coil. When performing, the workability can be improved. Furthermore, the power supply cable can be firmly attached to the solenoid portion by crawling the leading end of the power supply cable in the gap between the board and the solenoid assembly.

[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 molding 27 for sealing the resin.
The solenoid assembly 26 has a bobbin 28 provided with flange portions 28b and 28c at both ends of a cylindrical portion 28a, 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.

FIG. 3 is a perspective view showing the magnetic frame 31, which 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 so that 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.

FIG. 4 is a view showing the holder 40, and FIG.
FIG. 4 is a view showing a schematic structure of a substrate 41.
Reference numeral 0 denotes a substantially planar T-shape as a whole, and an engagement claw 45 that engages with an engagement hole 45 formed in the magnetic frame 31.
a and two engagement grooves 46 formed in the magnetic frame 31.
And two engaging claws 46a for engaging the magnetic frame 3 with the engaging claws 45a and 46a.
1 will be attached.

In order to hold the substrate 41 by the holder 40, the holder 40 has an engagement claw 47 a which engages with an engagement hole 47 formed in the substrate 41, and an engagement groove formed in the substrate 41. Engagement claws 48a are formed to engage with the base plate 48 to sandwich the substrate 41 from both sides.

FIG. 6 is a side view showing the substrate 41 to which the power supply cable 42 is connected. A grommet 51 made of rubber, resin, or the like is attached to the mounting end of the power supply cable 42. The distal end of the power supply cable 42 protruding from the grommet 51 is crawled around the back side of the board 41, that is, the gap formed by the holder 40 between the board 41 and the solenoid assembly 26,
The portion of the lead wire protruding from the tip is electrically connected to the printed wiring formed on the upper surface of the substrate 41 by soldering. As described above, the connection between the power supply cable 42 and the substrate 41 can be strengthened by crawling the distal end of the power supply cable 42 toward the rear side of the substrate 41.

As shown in FIG. 5, the substrate 41 is formed with two holes 52a through which the power supply cable 42 penetrates and two holes 52b through which the lead terminal 29a at the tip of the coil 29 penetrates.

A heat-resistant resin 53 made of silicon rubber or the like is applied so as to cover the printed wiring portion formed on the surface of the substrate 41 and the power supply controller 43 disposed on the substrate 41. .

As shown in FIG. 1, a cover 54 is attached to the end surface of the solenoid assembly 26. The cover 54 is manually operated by a flexible resin which is elastically deformable. 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. By providing a projection on the inner surface of the bobbin 28 for contacting the magnetic ring 56 incorporated therein, the magnetic ring 56 can be prevented from coming off when the magnetic ring 56 is assembled in the bobbin 28.

In order to manufacture the above-mentioned solenoid section 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 soldered 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 the substrate 41 and a part of the grommet 51 form a resin for forming the resin molded portion 27. Embedded by The substrate 41 is covered with the resin molding 27 including a power supply controller such as a diode provided on the substrate 41.

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.

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.

[0039]

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

(1) The manufacturing efficiency of the solenoid valve solenoid can be improved by sealing the solenoid assembly of the solenoid valve resin with the resin molding portion and also sealing the substrate with the resin.

(2) A power supply controller is provided at the time of resin molding by covering the surface of the substrate with a heat-resistant resin so that the molten resin does not come into direct contact with the printed wiring and the soldered portion when molding the resin molded portion. And damage to the soldered portion is prevented.

(3) The power supply cable can be firmly connected to the solenoid by crawling the power supply cable to the rear surface of the board.

(4) By attaching the board to the solenoid via the holder, the workability of soldering when the lead wire is soldered to a predetermined portion of the board is improved.

[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.

FIG. 3 is a perspective view showing the magnetic frame shown in FIG. 1;

FIG. 4 is a perspective view showing the holder shown in FIG. 1;

FIG. 5 is a plan view showing the printed wiring board shown in FIG.

FIG. 6 is a front view showing the board on which a power supply cable and a power supply controller are attached.

[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 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 45 engagement hole 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 in which the bobbin is incorporated, attached to the magnetic frame via a holder, a lead terminal of the coil and a power supply cable are connected, and the power supply cable and the lead terminal A substrate provided with a power supply controller provided therebetween, a grommet provided at a connection terminal of the power supply cable, and a resin molded portion that seals the solenoid assembly together with a part of the substrate and the grommet. Wherein the substrate is embedded in the resin molded part. 2. The solenoid valve solenoid according to claim 1, wherein the surface of the substrate and the power supply controller are covered with a heat resistant resin before the resin molding of the resin molding portion is performed. . 3. The solenoid valve according to claim 1, wherein a holder is engaged with the magnetic frame, and a substrate is engaged with the holder, whereby the substrate is connected to the magnetic frame via the holder. Solenoid valve solenoid characterized by being attached. 4. The solenoid valve solenoid according to claim 1, wherein an end of the power supply cable is crawled around a gap between the board and the solenoid assembly. Solenoid valve solenoid characterized by the following.