JPH07317935A - Purge valve with safety valve mechanism - Google Patents

Abstract

PURPOSE:To operate a safety valve mechanism automatically when a charge gas pressure or a charge air pressure is made higher than a specified pressure. CONSTITUTION:In a purge valve in which the pin 9 of a valve core 8 installed in a valve body 1 is pushed in to the inside against a spring force by pushing in a push-button 16 at the front end side of the valve body 1 so as to open a passage, and a gas or an air is purged from a discharge hole 7 formed to the valve body 1, the valve core 8 is fixed to the inner periphery of a tubular slider 10, and the slider 10 is installed to the inner periphery of the valve body 1 movable in the axial direction of the push-button direction. At the same time, a coil spring 14 to energize the slider 10 in the reverse direction of the push- button direction is installed to the outer periphery of the slider 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purge valve used for gas charge or air charge, and more particularly to a purge valve in which a safety valve mechanism automatically operates when the gas pressure or the air pressure is charged more than a specified pressure.

[0002]

2. Description of the Related Art A conventional purge valve, which is attached to a manifold for charging refrigerant gas or used for air charging, is constructed so that a valve core assembled to a valve body can be opened by pushing a push button. There is.

[0003]

As described above, in the conventional purge valve, the valve core and the push button for opening the valve core are simply attached to the body, and even when the gas or the air is charged to the specified pressure or more,
There was a problem that no safety mechanism worked.

The present invention has been proposed in order to solve the problems of the prior art, and a purge valve in which a safety valve mechanism automatically operates when the charge gas pressure or the charge air pressure exceeds a specified pressure. The purpose is to provide.

[0005]

In order to achieve this object, according to the present invention, the push button on the tip side of the valve body is pushed in so that the pin of the valve core mounted in the valve body resists the spring force to the inside. In a purge valve in which a passage is opened by pushing into a valve body and gas or air is purged from a discharge hole formed in the valve body, the valve core is fixed to an inner peripheral portion of a cylindrical slider, and the slider is fixed to the valve body. Is attached to the inner peripheral portion of the slider so as to be movable in the axial direction of the push button direction, and the outer peripheral portion of the slider is provided with a coil spring for urging the slider in a direction opposite to the push button direction.

According to the above construction, when the charged gas pressure or air pressure exceeds the specified pressure, the slider with the valve core, which receives this pressure, resists the spring force of the coil spring in the push button direction in the valve body. To move. As a result, the pin on the tip side of the valve core comes into contact with the bottom of the push button and the pin is pushed into the valve core, so that the passage of the valve core is opened and gas or air is automatically purged from the discharge hole. In this operation, when the gas pressure or the air pressure becomes equal to or lower than the specified pressure, the spring force of the coil spring returns the slider to the fixed position.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. An embodiment of a purge valve with a safety valve mechanism according to the present invention is shown in the cutaway sectional view of FIG. In this figure, a cylindrical valve body 1 has a male screw portion 2 formed on the base,
The male screw portion 2 is screwed to a manifold 4 for gas charging or air charging. 3 is a nut-shaped tightening portion formed on the outer circumference.

On the inner peripheral portion of the valve body 1, a slider 10 integrally attached with a valve core 8 is assembled so as to be movable in the axial direction of the push button direction. On the inner peripheral wall of the valve body 1, there is formed a step portion 5 with which a stopper 11 protruding in a flange shape is brought into contact with the outer periphery of the lower portion of the slider 10, and on the lower side of the step portion 5, an O-ring 2 is formed.
A step portion 6 into which 0 is fitted is formed. In addition, a discharge hole 7 that communicates the inner and outer circumferences is formed in the middle of the valve body 1.

When mounting the valve core 8 on the cylindrical slider 10, the male screw portion 1 on the outer peripheral portion of the valve core 8 is attached to the female screw portion 12 formed on the inner peripheral upper portion of the slider 10.
3 is tightly screwed. The valve core 8 has a fluid passage opened by pushing in a spring-biased pin 9 on the tip side. On the outer periphery of the lower end of the slider 10, the body 1
A concave portion 21 for sandwiching the O-ring 20 is formed between the concave portion 21 and the step portion 6 on the side.

A push button 16 for pressing the pin 9 of the valve core 8 from the outside is loosely fitted in the central portion of the pressing member 15 so as to be movable in the axial direction.
At the lower end of 6, a flange-like stopper 17 for preventing the stopper from coming into contact with the lower surface of the pressing member 15 is provided.

In the slider 10 in which the valve core 8 is integrated, the O-ring 20 is fitted in the lower end recess 21 and the coil spring 14 abutting on the stopper 11 is fitted in the outer peripheral portion, and then the slider 10 is inserted in the valve body 1. It is installed from the top. In this state, the male screw portion 19 of the pressing member 15 to which the push button 16 is attached is screwed into the female screw portion 18 at the upper portion of the inner circumference of the valve body 1, so that the slider 10 with the valve core is incorporated in the valve body 1. The coil spring 14 constantly urges the slider 10 in a direction opposite to the push button direction. Further, the slider 10 and the valve body 1 are connected by the O-ring 20.
The airtightness is maintained. Here, the valve body 1 including the slider 10, the O-ring 20, the coil spring 14, and the discharge hole 7 constitutes a safety valve mechanism.

In the purge valve with the safety valve mechanism constructed as above, when the push button 16 is pushed and the pin 9 is pushed in, the valve core 8 is opened, and gas or air can be purged (released) to the outside from the discharge hole 7. Further, when the gas or air is charged to a pressure higher than the specified pressure, the valve core 8 is resisted against the coil spring 14 as shown in FIG.
The slider 10 integrated with the slider moves in the push button direction,
The pin 9 hits the bottom of the push button 16, the valve core 8 is opened, and gas or air is purged from the discharge hole 7. When the gas pressure or the air pressure on the charge side drops below a specified pressure due to the operation of this safety valve mechanism, the slider 10 integrated with the valve core 8 is pushed back by the spring force of the coil spring 14, and the pin 9 is disengaged from the push button 16. As a result, the fluid passage of the valve core 8 is closed.

The operation starting pressure for operating the safety valve mechanism can be set by the pressure receiving areas of the slider 10 and the valve core 8 and the strength of the coil spring 14.

[0014]

As described above, in the purge valve according to the present invention, the valve core is fixed to the slider, and the slider is assembled in the valve body so as to move in the push button direction against the spring force. Alternatively, when the air pressure exceeds a specified pressure, the slider moves in the push button direction against the spring force, the pin of the valve core is pushed, and the passage is automatically opened. In this way, it is safe because the safety valve mechanism automatically operates when the charged gas pressure or air pressure exceeds the specified pressure.

[Brief description of drawings]

FIG. 1 is a cutaway sectional view showing an embodiment of a purge valve with a safety valve mechanism according to the present invention.

FIG. 2 is a cutaway sectional view of the purge valve of FIG. 1 showing a state in which a safety valve mechanism is activated.

[Explanation of symbols]

 1 Valve body 7 Discharge hole 8 Valve core 9 Pin 10 Slider 14 Coil spring 15 Holding member 16 Push button 20 O-ring

Claims (1)

[Claims] 1. A push button on the front end side of a valve body is pushed in, whereby a pin of a valve core mounted in the valve body is pushed inward against a spring force to open a passage and to be bored in the valve body. In the purge valve in which gas or air is purged from the discharge hole, the valve core is fixed to the inner peripheral portion of the cylindrical slider, and the slider can be moved in the inner peripheral portion of the valve body in the axial direction of the push button direction. Attached to the
A purge valve with a safety valve mechanism, wherein a coil spring for urging the slider in a direction opposite to a push button direction is attached to an outer peripheral portion of the slider.