JPS5868570A - Proportional control valve - Google Patents

Abstract

PURPOSE:To improve reliability of operation of a valve which is used for controlling fluid pressure by moving a valve element by a diaphragm by use of electromagnetic force and to facilitate assembling operation of the same, by coupling the diaphragm and the valve element together securely by use of a fastening pin and a snap ring. CONSTITUTION:A valve element 21 is disposed to face a valve seat 20 of a valve body 33 having a fluid inlet port 18 and a fluid outlet port 19, and a diaphragm 22 held between the valve body 33 and a retainer 34 at its peripheral portion is disposed above the valve element 21 and fixed to the element 21 securely by use of a fastening pin 24 and a snap ring 28. With such an arrangement, electromagnetic force produced by an electromagnetic means 34 consisting of yokes 30, 31 a plunger 32 and a coil 29 is received at the top 25 of the fastening pin 24 and transmitted to the valve element 21. Here, it is preferable to make the pin 24 from a metal and to form a flange portion 26 at its top so that a diaphragm plate 23 can be retained in a wide area. Further, it is preferable to make the snap ring 28, for instance, from a thin stainless steel and to form a projection in the form of a knife-edge on the inside thereof so that it can be fitted tightly into the shaft portion 27 of the pin 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a proportional control valve that proportionally controls the combustion amount of gas combustion equipment. 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 a proportional control gas valve main body, 2 is a gas inlet, and 3 is a gas outlet. 4 is a valve body attached to the diaphragm 5, and 6 is a valve port. 7 is a sliding tube around which a coil 8 is wound. 09 is a recess provided at the lower end of the sliding tube 7, and a gap is provided above the pivot 1o provided at the top of the valve body 4 so that it can freely move in the left and right direction. A is engaged and placed. 11 is a magnet, 12 is a guide tube, 13 is a plate, 14 is a reinforcing plate, 15 is a spring,
16 is a lead terminal.

The spring 16 presses and fixes the reinforcing plate 14 and the diaphragm 5 to the valve body 4 through an E-shaped retaining ring 17 fitted into the upper part of the valve body 4.

The conventional example has such a configuration, in which the sliding cylinder 7 moves up and down due to 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 adjust the gas flow rate. control,
It also has the function of 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 opening 6 of the valve body 4 is formed. In order to improve the roundness and surface condition of the abutting part, a resin-molded gate is generally formed on the upper end surface of the pivot 1o, which limits its shape and makes it difficult to obtain a good surface condition. body 4
It is difficult to obtain good proportional control characteristics because the slope tends to occur. Second, in order to reliably connect the diaphragm 6 and the valve body 4, a considerably strong force is required from the spring 16, and considering variations in spring set length, etc., the connecting portion is considerably long and the entire proportional control valve is height increases. Thirdly, it is difficult to assemble. That is, after inserting the diaphragm 6 and the reinforcing plate 14 into the valve body 4, the spring 15 is placed on the valve body 4 and compressed until they are almost in close contact.
The E-type retaining ring must be inserted in a direction perpendicular to the valve body 4.

The present invention solves the above-mentioned conventional problems, and aims to reliably 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. Stabilization and proportional control valve/J
・The purpose is to realize a fastening method in a small space that can be molded and to improve ease of assembly.

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 inclined blade-like protrusions on the inner side of the bottom of the valve body is press-fitted into the shaft portion of the fastening pin. The basic configuration is that the diaphragm and valve body are connected.

With this configuration, the diaphragm and valve body are securely connected,
Moreover, it solves the shortcomings of the conventional example.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, a valve body 33 is provided with a fluid inlet 18, an outlet 19, and a valve seat 2o, and a valve body 33 is provided with a valve body 33. The diaphragm 22 clamped and fixed with the presser foot 34 is fastened with the fastening pin 24 and the retaining ring 28, and the yokes 30, 31
．． Plunger 32. The electromagnetic force generated by the electromagnetic device 34 consisting of the coil 29 is received by the contact portion 25 of the fastening pin 24,
The configuration is such that the information is transmitted to the valve body 21. The fastening pin 24 is made of aluminum and has a flange portion 26 on the top thereof, and presses the cutting board 23 made of a thin plate over a wide area.

d - The ring 28 is made of thin plate stainless steel, has a circular outer shape, and has four slightly slanted protrusions on the inside so that it can be press-fitted in the axial direction of the shaft part 27 of the fastening pin 24. In the tangential direction, a force on the force field is required when press-fitting. In this example, when the diameter of the shaft portion 27 is 3 m, the press-fitting force is 8# and the force in the pulling direction is 12A? That was it.

The function of this embodiment as a proportional control valve is the same as in the conventional example: the electromagnetic device 340 generates an electromagnetic cuff 5; the plunger 32 is pushed down and at the same time the fastening pin 270 contacts the contact portion 25; the diaphragm 22 and the valve body It acts to push down 21. Then, by changing the electromagnetic force using the well-known principle of a governor, the outlet pressure of the fluid can be controlled proportionally.

The effects of this embodiment are as follows: First, the aluminum fastening pin 24;
Sufficient fastening strength was obtained by the stainless steel retaining ring 28. Second, the abutting portion 26 of the fastening pin 24 is made spherical and the lower end surface of the plunger 32 is made flat, thereby preventing the valve body 21 from tilting and making the north side control operation extremely stable. Thirdly, by making the diameter of the flange portion 26 of the fastening pin 24 sufficiently large, the sprinkling plate 23 is not distorted and has good adhesion to the diaphragm 22, so there is little change in the effective pressure receiving area of the diaphragm 22, and the proportional control valve The characteristics of the product are 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, fasten the retaining ring 28 to the fastening pin 24.Although the drawing is omitted,
It is also practically effective to make the lunge portion 26 larger or to make a part of the seven lunge portions 26 larger in 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 that does not cause 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 area 7 langes of the fastening pin press against the cutting board or diaphragm, the cutting board or diaphragm is less likely to be distorted. Fourth, 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... Entrance, 19... Exit, 2o.
... Valve seat, 21 ... Valve body, 22 ...
・・Diaphragm, 23・・・Screening board, 24・・
...... Fastening pin, 26... Contact part, 26
......7 lange part, 27...shaft part, 28
...Retaining ring, 33 ...Valve body, 34
・・・・・・Electromagnetic device. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 12 Figure zl / Evening

Claims (4)

[Claims] (1) A valve body is equipped with a fluid inlet, an outlet, and a valve seat, and a diaphragm with a fixed outer periphery is attached to the upper part of the valve body, and an electromagnetic force generated by an electromagnetic device is applied to the valve body. The proportional control valve has the diaphragm and the valve body held together by a fastening pin and a retaining ring, each of which includes a contact portion that receives the electromagnetic force, seven flange portions, and a shaft portion, and a retaining ring. (2) The proportional control valve according to claim 1, wherein the contact portion receiving electromagnetic force has a spherical shape. (3) The proportional control valve according to claim 1, wherein the fastening pin is made of metal. (4) The proportional control valve according to claim 1, wherein the seven flange portions of the fastening pin also serve as a cutting board.