JPS585156Y2 - Overflow prevention valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called overflow prevention valve that is inserted into a gas circuit and automatically shuts off the gas circuit in the event of abnormal overflow conditions such as disconnection of a gas rubber tube.

This type of overflow prevention valve consists of a body valve and a cylindrical part that accommodates the body valve, and the downstream side (upper end) of this cylindrical part serves as the valve seat opening.
When the gas flow rate through the valve seat opening exceeds a certain level, that is, when the outer circumferential gap of the body valve in the cylindrical portion exceeds a certain level, the body valve is lifted up and fitted into the valve seat opening due to viscous resistance due to the flow of gas. , automatically shuts off the gas circuit.

Recently, when a gas appliance equipped with a solenoid valve and a pressure reducing valve is connected to the downstream side of this type of overflow prevention valve, the instantaneous opening of the solenoid valve instantly restores the flow rate condition ( It has been confirmed that a state of pseudo-overflow (hereinafter referred to as "pseudo-overflow state") occurs, and the body valve operates during this time, causing an inconvenience.

The above-mentioned inconvenience can be overcome by taking a longer time for the body valve to move within the cylindrical portion.

In the overflow prevention valve (Fig. 3) disclosed in JP-A-53-7228, the second axis of the valve seat opening and the axis of the cylindrical part 3 that accommodates the body valve are bent, and the two axes are bent. The body valve has a longer travel distance than a linear overflow prevention valve in which the body valve is located on the same axis, and the locus of movement bends at right angles at the top, so the body valve is The movement speed is reduced and the operating time is increased.

However, the increased operating time in this case cannot eliminate the above-mentioned disadvantages.

The technical problem of the present invention is to significantly extend the operating time of the body valve by causing the body valve to repeatedly collide with the fixed part during movement of the body valve.

In order to solve the above problems, the technical means of the present invention is to insert a coil spring in a bent shape from near the upstream end of the tapered part of the valve seat opening to the lower end of the cylinder, so that the body valve can be freely expanded and contracted, and to house the body valve in the coil spring. However, the inner diameter of the coil spring was set larger than the diameter of the body valve.

According to the above technical means, when the body valve is actuated, the body valve moves upward from the lowest end of the coil spring to reach the valve seat opening;
The coil spring is bent toward the valve seat opening, and a portion of the 61-ball valve rises while repeatedly colliding with the wires of the coil spring.

Furthermore, since the coil spring is expandable and retractable, the movement force of the body valve is absorbed and decelerated every time there is a collision.

Therefore, the body valve is decelerated every time there is a collision between the start of upward movement of the body valve and the point at which it fits into the valve seat opening, and the operation time of the body valve becomes significantly longer, resulting in a pseudo-overflow condition. Activation of body valves can be prevented.

Since the present invention has the above configuration, it has the following unique effects.

According to the above configuration, the coil spring smoothly bends from the lower end of the cylindrical portion to the valve seat opening.

Therefore, in the straight part of the coil spring, even if the body valve rises without contacting the strands depending on the combination conditions of the body valve and the coil spring, the body valve will always rise in the bent part. It collides with the strands and provides minimal deceleration effect.

Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

The main body 1 of the overflow prevention valve is bent in an inverted shape, and the valve seat opening 2 at the downstream end is oriented sideways and forms a tapered part that expands toward the upstream side. The downwardly curved flow path serves as a vertical cylindrical portion 3.

The main body is housed and fixed in a valve chamber 4 disposed in a cock or the like, the valve seat opening 2 opens to the downstream flow passage 5, and the lower end opening of the cylindrical portion 3 is connected to the gas continuing upstream of the valve chamber 4. It opens towards a population of 6.

An opening T of an appropriate size is formed in the side wall of the cylindrical portion 3 to communicate the inside and outside of the cylindrical portion, and a coil spring 8 slightly smaller than the inner diameter of the cylindrical portion is housed inside. The upper end) is inserted into the vicinity of the valve seat opening 2, and the other end is inserted as shown in Fig. 2.
The free end portion 9 is bent and extended over the diameter of the coil spring 8, and the hook-shaped portion at its tip is locked in a through hole 10 formed in the lower end side wall of the cylindrical portion 3.

When the coil spring is installed, the body valve 11 is housed in the coil spring 8 in advance, and the upper end of the coil spring 8 is fixed in a press-fitted state near the large diameter part of the second taper part of the valve seat opening 2. As a result, the coil spring 8 is also attached in an upwardly bent state.

In the overflow prevention valve of the embodiment described above, when an overflow state occurs, the body valve 11 stored in a free state on the free end portion 9
As the amount of gas flowing through the outer circumferential gap increases, the body valve 11 is lifted and fitted into the valve seat opening 2Vc, and after fitting, it is held in this fitted state by the gas heating force, and the gas circuit 75
Musically cut off.

When the body valve is actuated, the body valve moves upward from the lowest end of the coil spring 8, but since the coil spring 8 is bent toward the valve seat opening 2, the body valve moves upward by one pinch of the coil spring. In other words, a part of the valve 11 rises as if rolling on one side of the coil spring 8 while coming into contact with the wire.

Therefore, the operating time of the body valve 11 is significantly extended compared to an overflow prevention valve that does not have a coil spring inserted therein.

From this, even when the overflow prevention valve according to the embodiment of the present invention is inserted upstream of a device equipped with a quick-opening/closing valve such as a solenoid valve, the instantaneous spurious discharge that occurs when the quick-opening/closing valve is opened can be avoided. During the overflow state, the body valve 11 does not reach the valve seat port 2, and when the steady state returns, the body valve 11 returns and descends from the upstream side of the valve seat port 2 to the lower end of the cylindrical portion 3.

That is, there is no ball valve operation due to the opening of a quick-open/close valve such as a solenoid valve.

In the case of the illustrated embodiment, the free end 9 of the lower end of the coil spring 8 is extended in the diametrical direction, and its tip is shaped like a hook to engage with the through hole 10 of the cylindrical portion 3. No special means for holding the body valve 11 in a free state is required, and installation of the body valve 11 is completed by simply attaching the coil spring 8.

In addition, since the overflow prevention valve of the present invention uses the side opening as the valve seat port, it can be installed in a gas cock with an upper gas inlet instead of the conventional linear type with the upper end opening as the valve seat port. The configuration of the gas circuit is greatly simplified compared to the overflow prevention valve.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the embodiment of the present invention, and Fig. 2 is a coil spring 8.
Fig. 3 is an explanatory view of the conventional example, and in the figure, 2... side opening, 3... tube section, 8...
...Coil spring, 11...Body valve.

Claims (1)

[Scope of utility model registration request] In a device in which a horizontal valve seat opening 2 is provided at the upper part of the main body 1 and a cylindrical portion 3 bent downward is provided on the upstream side thereof, the cylindrical portion 3 is Insert the coil spring 8 in a telescopically bent state over the lower end of the
□ An overflow prevention valve in which the body valve 11 is accommodated within the coil spring, and the inner diameter of the coil spring is set larger than the diameter of the body valve.