JPH0238139Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a solenoid valve used for controlling fluids such as gas or liquid fuel.

(Description of prior art) Due to the diversification of control elements, solenoid valves used to control fluids such as gas are often used in combination with fluid pressure regulators, flow rate regulators, etc. It is becoming less common for valves to be used alone.

In addition, it has become necessary to reduce the number of parts and joints incorporated into these devices, and to ensure reliability and a fixed price as a control device. In other words, measures to ensure reliability, respond to the diversification of specifications requested by customers, and promote low prices by simplifying the manufacturing process are essential conditions.

However, as shown in FIG. 4, in the conventional electromagnetic valve, the fluid that needs to be controlled is closed off by a valve rubber 52 installed opposite to a valve seat 51, and the closing force is applied to the plunger 5.
3 by means of a valve spring 54 which presses the valve downward.
A plunger guide 55 is installed to guide the sliding movement of the plunger and seal gas etc., and a coil 56 is made of a magnetic material to convert the generated magnetic force into the function of the plunger. It is composed of a yoke 57, a cover body 58, and the like.

In such a conventional electromagnetic piece, the electromagnetic force is inversely proportional to the square of the distance, so the plunger 53
The operating stroke A is one of the important points of view. This operating stroke A is based on the dimension B from the mounting part of the valve case main body 50 to the valve seat, which constitutes the valve seat 51, the dimension C of the yoke 57, and the position D of the plunger when there is no electromagnetic force, that is, when it is closed. Determined by relationship. Therefore, the operating stroke of the plunger is A=(B+C)-D, and among these dimensions, it is difficult to ensure C and D, which are composed of a plurality of parts.

In addition, the closing performance is determined by the pressing force of the valve rubber and the preliminary accuracy of the valve seat, but since the valve case body that integrally constitutes the valve seat is formed by die-casting or casting, there are no casting holes etc. The presence of pinholes impairs yields, increases process defects, and is a factor leading to decreased reliability.

(Purpose of the invention) The present invention addresses these conventional problems, and its first purpose is to respond to the diversification of specifications and simplify the manufacturing process. The purpose is to provide a solenoid valve for fluid control that can facilitate standardization, promote reliability and fixed price, and the second purpose is to make it easy to manage the plunger stroke before and after assembly, and to avoid variations in quality performance. It is an object of the present invention to provide a solenoid valve of this type that is free from any problems, has a small number of parts, and is easy to manufacture and assemble.

Another purpose of the present invention is to provide a solenoid valve that is simple in construction, easy to unitize, and has low production management costs.Another purpose is to provide a solenoid valve that is simple in construction, easy to unitize, and has low production management costs. To easily and inexpensively provide a composite type solenoid valve that can be incorporated and used.

(Structure of the invention) In order to achieve such an object, the present invention employs a yoke fitting in which the plunger is slidably fitted opposite the yoke by the repulsion or attraction force of the electromagnetic coil winding and the permanent magnet. A solenoid valve block body consisting of a plunger guide, a valve seat with a valve rubber placed opposite the valve port to open and close the gas passage,
The electromagnetic valve block is fitted into a valve case body having an inlet and an outlet, and the electromagnetic valve block body is fixed to the valve case body by a cover body forming a magnetic circuit.

(Example) Figure 1 shows a single type solenoid valve.

In this figure and FIG. 3, 1 is a valve case body having a gas inlet 2 at one end and a gas outlet 3 at the other end, into which a solenoid valve block 10 is assembled.

The electromagnetic valve block body 10 includes a winding part 11 of the electromagnetic coil 4, a fitting part 12 of the yoke 5, and a plunger 6.
a plunger guide 13 into which the plunger guide 13 is slidably inserted;
and a valve seat 15 with a valve rubber 8 disposed opposite the valve port 14 so as to open and close the gas passage 7,
The entire structure is made of heat-resistant and chemical-resistant plastic.

The valve rubber 8 is connected to the plunger 6 via a valve stem 9. The yoke fitting portion 12 and the plunger guide 13 are formed to face each other, but are separated from each other by a partition plate 16 so as not to communicate with each other.

The yoke 5 and the plunger 6 are made of permanent magnets, and are set so as to be magnetically attracted to each other via a partition plate 16. Therefore, the valve rubber 8 is pressed against the valve seat 15 due to the adsorption force between the two, and the valve opening 1 is pressed against the valve seat 15.
4 is obstructed.

The plunger 6 with the valve rubber 8 attached and the yoke 5 are assembled into the solenoid valve block body 10, the coil 4 is wound around the coil winding portion 11, and the coil 4 is fitted onto the valve case body 1, covered with the cover body 17, and the setscrews are tightened. Fixed at 18. The yoke 5 and the cover body 17 are caulked together with rivets 19 or the like.

Concave grooves 21 and 22 are provided in the portions of the block body 10 corresponding to the fitting portions, and rubber seals 23 and 2 are provided therein.
4 into place.

Figure 2 shows a composite solenoid valve. In the illustrated example, two solenoid valve blocks are used, and the same reference numerals indicate common parts.

(Operation and Effect) When the electromagnetic coil 4 is not energized, the plunger 6 is attracted to the fixed yoke 5, and the valve rubber 8 is magnetically pressed against the valve seat 15, so that it is in a closed state.

Now, when current is passed through the electromagnetic coil 4, the yoke 5 is magnetized, and the magnetic force is repelled from the corresponding plunger 6. Therefore, the valve rubber 8 is
The valve opening is opened so that the gas flows out from the valve opening 14 via the gas passage 7 to the outlet 3.

Since the present invention has the above-mentioned structure, a solenoid valve can be easily obtained by fitting and fixing the solenoid valve block body, which incorporates the yoke, plunger, valve rubber, etc., into the valve case body. We can respond to diversifying specifications and simplify the manufacturing process. It is possible to easily standardize and provide highly reliable solenoid valves for fluid control, and it is also easy to manage the plunger stroke before and after assembly, so there is no variation in quality performance, and it is easy to unitize, reducing production management costs. This type of solenoid valve can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of a single type solenoid valve showing an embodiment of the present invention, Fig. 2 is a longitudinal side view of the case where it is applied to a composite type solenoid valve, and Fig. 3 is a perspective view of the solenoid valve block body. FIG. 4 is a longitudinal sectional side view showing a conventional solenoid valve. DESCRIPTION OF SYMBOLS 1... Valve case body, 2... Inflow port, 3... Outlet port, 4... Coil, 5... Yoke, 6... Plunger, 8... Valve rubber, 10... Solenoid valve block body, 11... ...Winding part, 12...Yoke insertion part,
13... Plunger guide, 14... Valve port, 1
5... Valve seat, 17... Cover body.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A winding part of an electromagnetic coil, a yoke insertion part and a plunger guide in which the plunger is slidably inserted in opposition to the yoke by the repulsion or attraction force of a permanent magnet; A solenoid valve block body consisting of a valve seat and a valve seat with a valve rubber facing the valve opening so as to open and close a gas passage is fitted into a valve case body having an inlet and an outlet, and the solenoid valve block body is fixed to the valve case body with a cover body constituting a magnetic circuit. (2) The solenoid valve according to claim 1, wherein the solenoid valve block body is integrally molded from heat-resistant and chemical-resistant plastic. (3) The solenoid valve according to claim 1 of the utility model registration, characterized in that a plurality of solenoid valve blocks are incorporated into the valve case body.