JPS6139555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a proportional control valve that proportionally controls the combustion amount of gas combustion equipment, and a valve that changes the passage area of the fluid in a diaphragm that receives fluid pressure and seals the fluid from the atmosphere. The present invention relates to a proportional control valve that controls fluid pressure by tightening a valve body and applying electromagnetic force to the valve body.

FIG. 1 shows a conventional example.

1 is the proportional control gas valve main body, 2 is the gas inlet, 3
is the gas outlet. 4 is a valve body attached to the diaphragm 5, and 6 is a valve port. 7 has a coil 8 on the outer circumference
It is a sliding tube wound with . Reference numeral 9 denotes a concave portion provided at the lower end of the sliding tube 7, which is engaged with and placed on a pivot 10 provided at the upper portion of the valve body 4 with a gap a allowing free movement in the left and right direction. 11 is a magnet, 12 is a guide tube, 13 is a plate, 14 is a reinforcing plate, 15 is a spring, and 16 is a lead terminal.

The spring 15 is fitted into the upper part of the valve body 4.
The reinforcing plate 14 and the diaphragm 5 are connected by the retaining ring 17.
is pressed and fixed to the valve body 4.

The conventional example has such a configuration, in which the sliding tube 7 moves up and down by the electromagnetic force of the coil 8 generated in response to an external current signal, and the valve body 4 adjusts the opening degree of the valve port 6 to control the gas flow rate. It also functions as a gas governor.

The problem with the conventional example is that first, the upper end surface of the pivot 10 on which the electromagnetic force acts on the valve body 4 is formed at the same time as the valve body 4 is molded, and when the valve body 4 is molded, the valve body 4 is
In order to improve the roundness and surface condition of the contact area with the valve port 6, a resin-molded gate is generally formed on the upper end surface of the pivot 10, which limits its shape and makes it difficult to obtain a good surface condition. As a result, the valve body 4 tends to tilt, making it difficult to obtain good proportional control characteristics. Secondly, in order to reliably connect the diaphragm 5 and the valve body 4, a considerably strong force is required from the spring 15, and considering variations in the spring set length, the connecting portion becomes considerably long and the overall height of the proportional control valve increases. becomes higher. Thirdly, it is difficult to assemble. That is, the valve body 4
After inserting the diaphragm 5 and reinforcing plate 14 into the spring 15
The E-shaped retaining ring must be inserted in a direction perpendicular to the valve body 4.

The present invention solves the above conventional problems,
The purpose is to securely connect the diaphragm and the valve body so that the proportional control valve will not loosen even if the proportional control valve operates over a long period of time. The purpose is to realize a space fastening method and improve assembly efficiency.

The present invention has a contact part that can smoothly transmit electromagnetic force to a fastening pin that is a separate member from the valve body, a flange part that presses a diaphragm or a cutting board usually made of thin sheet metal over a large area, and a small-diameter shaft part. a retaining ring having a plurality of slanted blade-like protrusions inward from the bottom of the valve body is press-fitted into the shaft of the fastening pin. The basic configuration is that the diaphragm and valve body are connected.

With this configuration, the diaphragm and the valve body are reliably fastened together, and the problems of the prior art are solved.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, fluid inlet 18
A valve body 33 is provided with an outlet 19 and a valve seat 20, and a valve body 21 is mounted opposite the valve seat 20, and the valve body 21
A diaphragm 22 whose outer periphery is clamped and fixed by a valve body 33 and a retainer 34 is fastened to the upper part of the valve body 1 by a fastening pin 24 and a retaining ring 28, and an electromagnetic device 34 consisting of yokes 30, 31, a plunger 32 and a coil 29 is generated. The electromagnetic force is received by the contact portion 25 of the fastening pin 24 and transmitted to the valve body 21. The fastening pin 24 is made of aluminum, has a flange portion 26 on its upper part, and presses the cutting board 23 made of a thin plate over a wide area. The retaining ring 28 is made of thin plate stainless steel, has a circular outer shape, and has four slightly slanted blade-like protrusions on the inside, and can be press-fitted in the axial direction of the shaft portion 27 of the fastening pin 24. However, once press-fitted, it will move in the removal direction. requires a force greater than the force used for press-fitting.

In this embodiment, when the diameter of the shaft portion 27 is 3 mm,
The force for press-fitting was 8 kg, and the force in the pulling direction was over 12 kg.

The function of this embodiment as a proportional control valve is similar to that of the conventional example, in which the electromagnetic force generated by the electromagnetic device 34 pushes the plunger 32 downward, and at the same time, the diaphragm 22 and the valve remain in contact with the contact portion 25 of the fastening pin 27. It acts to push the body 21 downward. Then, by changing the electromagnetic force using the well-known governor principle, the outlet pressure of the fluid can be controlled proportionally.

The first effect of this embodiment is that sufficient fastening strength was obtained by the aluminum fastening pin 24 and the stainless steel retaining ring 28. Secondly, by making the abutting portion 25 of the fastening pin 24 spherical and making the lower end surface of the plunger 32 flat, the valve body 21 does not tilt, making the proportional control operation extremely stable. Thirdly, by making the diameter of the flange portion 26 of the fastening pin 24 sufficiently large, the cutting board 23 is not distorted and has good adhesion to the diaphragm 22. Therefore, there is little change in the effective pressure receiving area of the diaphragm 22, and proportional control is achieved. The characteristics as a valve have become stable. Fourthly, the dimension from the upper surface of the diaphragm 22 to the lower end of the plunger 32 can be reduced, and the height dimension of the proportional control valve can be reduced. Fifth, since the retaining ring 28 can be inserted into the shaft portion 27 of the fastening pin 24 in the axial direction, ease of assembly is improved.

Although not shown in the drawings, it is also practically effective to make the flange portion 26 of the fastening pin 24 larger, or to make a part of the flange portion 26 have a larger diameter so that it also serves as the cutting board 23.

As described in detail above, the effect of the present invention is that by providing the fastening pin separately from the valve body, the material can be freely selected, sufficient fastening strength can be obtained, and a highly reliable proportional control valve can be realized. Furthermore, the unique effects of the present invention are as follows: Firstly, the fastening pin is provided with a contact portion that receives electromagnetic force, and an appropriate shape and material can be selected regardless of the valve body, which eliminates problems such as tilting of the valve body. It is possible to realize a proportional control valve with stable characteristics without any problems. Second, since the abutting part of the fastening pin is provided on the top of the diaphragm and the retaining ring is provided on the bottom side of the valve body, the dimension up to the abutting part that receives the electromagnetic force on the top of the diaphragm can be reduced, and the height of the proportional control valve can be reduced. to be able to make it smaller. Thirdly, since the relatively wide flange portion of the fastening pin presses against the cutting board or diaphragm, the cutting board or diaphragm is less likely to be distorted. Fourthly, the fastening is completed by press-fitting the retaining ring in the axial direction of the fastening pin, so it is easy to assemble.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional proportional control valve, and FIG. 2 is a cross-sectional view of a proportional control valve according to an embodiment of the present invention. 18...Inlet, 19...Outlet, 20...Valve seat,
21...Valve body, 22...Diaphragm, 23...
Cutting board, 24... Fastening pin, 25... Contact portion, 2
6...Flange portion, 27...Shaft portion, 28...Retaining ring, 33...Valve body, 34...Electromagnetic device.

Claims (1)

[Scope of Claims] 1. A valve body is provided with a fluid inlet, an outlet, and a valve seat, and a valve body is equipped with a valve body, a diaphragm whose outer periphery is fixed to the valve body is attached to the upper part of the valve body, and an electromagnetic wire is attached to the valve body. The pressure of the fluid is controlled by applying the electromagnetic force generated by the device, and it uses a substantially spherical abutting part that receives the electromagnetic force, a fastening pin consisting of a flange part and a shaft part, and a retaining ring press-fitted into this fastening pin. A proportional control valve in which the diaphragm and the valve body are sandwiched. 2 Claim 1 in which the fastening pin is made of metal
Proportional control valve as described in section. 3. The proportional control valve according to claim 1, wherein the flange portion of the fastening pin also serves as a cover plate.