JPH1151237A - Pressure proportional control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a proportional control valve to control the gas combustion output whose dimensions of the back pressure chamber and valve element are decreased to lead to small-size construction of the product by locating a magnet, which has been installed on the back pressure side in a conventional arrangement, in a gas pressure chamber on the primary side, and in which so-called head swing phenomenon can be eliminated owing to the shortened distance between the center of gravity of the magnet and a valve seat to lead to enhancement of the controllability and stability of the rate of flow. SOLUTION: This proportional control valve comprises a diaphragm 1 to make displacement with a gas pressure, a valve element 3 of flow regulating valve coupled directly with diaphragm interlockingly and opens and closes a valve hole 8 directed from a gas inlet 10 to gas outlet 11, an electromagnetic device 13 to control the motion of the diaphragm 1 externally with the magnetic force, and a magnet 2 mounted on the diaphragm 1 so as to mate with the yoke 4 of the device 13. Therein the magnet 2 is transferred to the pressure side of the diaphragm 1 from its back pressure side, and is located between the inner surface of the diaphragm 1 and the mounting part of the valve element 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas governor capable of controlling the combustion output of a gas and a gas output proportional control valve using an electromagnetic device.

[0002]

2. Description of the Related Art Many gas proportional control valves comprising a gas governor which catches fluctuations in gas pressure with a diaphragm and an electromagnetic device for externally controlling the movement of the diaphragm by magnetic force have been proposed by the present inventors in many cases, and have been proposed in the past. Generally known from. (For example, Japanese Patent Publication No. 6-72673
No., JP-B-59-36155, and Jitsuhei 4-26774
No.).

A known proportional control valve is, as shown in FIG.
It comprises a diaphragm 51, a magnet body 52 mounted on the back pressure side of the diaphragm, a valve body 53, and a yoke 54 of an electromagnetic device. It controls the gas pressure on the side.

[0004]

However, in the conventional proportional control valve, the magnet body attached to the diaphragm is provided on the back pressure chamber side and provided between the yoke and the diaphragm. A sufficient space for the magnet body must be ensured, so that the size of the back pressure chamber and the external dimensions of the valve body are inevitably increased, which hinders downsizing and weight reduction of the product. Had.

Further, since the length of the valve shaft portion of the valve body 53 becomes large, the distance L between the valve seat of the valve body and the center of gravity of the magnet body becomes large, so that the valve body swings, that is, so-called swinging occurs. This has led to unstable flow control.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a magnet body facing a yoke of an electromagnetic device.
By moving from the back pressure chamber to the primary side gas pressure chamber, the size of the back pressure chamber and the size of the valve body are reduced, and the product can be downsized, and the distance between the center of gravity of the magnet and the valve seat can be reduced. It is an object of the present invention to provide a stable and high-performance pressure proportional control valve which does not vary and contributes to controllability and stability of a flow rate by eliminating a so-called swinging phenomenon of a valve element.

[0007]

In order to achieve the above object, a pressure proportional control valve according to the present invention is provided with a diaphragm 1 which is displaced by a gas pressure, and is directly connected so as to be interlocked with the diaphragm 1 and a gas outlet 10 through a gas outlet 10. A valve body 3 of a flow control valve which opens and closes a valve port 8 toward 11, an electromagnetic device 13 for externally controlling the movement of the diaphragm 1 by magnetic force, and a diaphragm attached to correspond to the yoke 4 of this electromagnetic device In the proportional control valve including the magnet body 2 provided, the magnet body 2 is moved from the back pressure side of the diaphragm 1 to the pressure side, and the magnet body is provided between the inner surface of the diaphragm and the mounting portion 31 of the valve body 3. It is.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the magnet body 2 is made of an iron piece of a permanent magnet, which is fixed to the inner surface of the diaphragm 1 on the primary pressure side to be integrated.

The diaphragm 1 is fitted with a peripheral edge thereof via a holding ring so as to close an opening portion on the primary side of the valve case main body 20, and an electromagnetic device 13 is mounted thereon to form an integral unit.

The valve body 3 of the flow regulating valve is provided with a valve case body 20.
A cylindrical mounting portion 31 is integrally provided so as to come into close contact with the valve port 8 serving as a gas passage, and the mounting portion 31, the magnet body 2 and the diaphragm 1 are integrated into three members.

The electromagnetic device 13 has an electromagnetic coil 15 wound around a bobbin 14 and a yoke 4 fitted and fixed in a central vertical hole thereof. The yoke 4 is connected to the magnet body 2 via the diaphragm 1. Facing each other.

[0013]

When the magnet coil is not energized and the magnet coil is not energized, the magnet body is attracted to the yoke so that the valve body moves up with the diaphragm and is pressed against the valve seat of the valve port. Closed.

Next, when a current is passed through the electromagnetic coil 15 in this state, the yoke 4 is excited and the valve body 3 moves down together with the diaphragm 1 together with the diaphragm 1 in order to depress the magnet body by the repulsive magnetic force. Valve seat 9 for mouth 8
The farther valve opening 8 is greatly opened.

The gas flows from the gas inlet 10 through the valve port 8 to the gas outlet 11. In this state, when the flow rate of the gas increases and the gas pressure on the primary side increases, the diaphragm 1 is moved upward, so that the valve element 3 operates to close the valve port 8 to limit the flow rate. When the gas pressure is reduced due to this restriction, the diaphragm 1 is lowered again, the valve port 8 is widened, and the gas flow rate is controlled within a predetermined range.

The electromagnetic force can be externally controlled by changing the current applied to the electromagnetic device to be strong or weak.

Since the magnet body 2 is provided on the pressure side of the diaphragm 1 and does not exist on the back pressure side, the size of the back pressure chamber 12 is reduced to a minimum.

The axial dimension of the valve 3 is reduced by the size of the magnet 2 due to the presence of the magnet 2.

[0019]

According to the present invention, the magnet body 2 is moved from the back pressure side of the diaphragm 1 to the pressure side as described above, and the magnet body is provided between the inner surface of the diaphragm and the mounting portion 31 of the valve body 3. Therefore, the size of the back pressure chamber and the size of the flow control valve are considerably reduced, and the size of the product can be reduced accordingly. In addition, since the distance between the center of gravity of the magnet body and the valve seat is reduced, the swaying phenomenon of the valve body can be almost eliminated, thereby improving the controllability and stability of the flow rate and contributing to high reliability. it can.

Further, since the magnet body 2 which is relocated from the back pressure chamber side to the gas passage exists, magnetic foreign matter (rust, etc. which is peeled off from the gas pipe and mixed into the primary side passage) in the gas passage. It becomes possible to adsorb to the magnet and remove it from the flowing gas, thereby improving the gas sealing properties, preventing abnormal combustion, and cleaning the equipment.

[0021]

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a gas proportional control valve showing a conventional example.

FIG. 2 is a vertical sectional front view of a proportional control valve according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Magnet 3 Valve 4 Yoke 8 Valve port 9 Valve seat 10 Gas inlet 11 Gas outlet 13 Electromagnetic device

Claims (1)

[Claims] 1. A diaphragm 1 displaced by a gas pressure.
And a valve body 3 of a flow control valve which is directly connected in conjunction therewith to open and close a valve port 8 from a gas inlet 10 to a gas outlet 11, and an electromagnetic device for externally controlling the movement of the diaphragm 1 by magnetic force. 13 and a magnet body 2 attached to a diaphragm corresponding to the yoke 4 of the electromagnetic device.
A pressure proportional control valve characterized in that the magnet body is provided between the inner surface of the diaphragm and the mounting portion 31 of the valve body 3 while the magnet body is moved from the back pressure side of the diaphragm 1 to the pressure side.