JPS5929187Y2 - Safety valve device in gas flow path - Google Patents

Description

[Detailed description of the invention] This invention is based on the idea that when the flow rate of gas flowing in the gas flow path exceeds a certain amount, the valve ball built into the gas flow path floats up and comes into close contact with the valve seat, causing the gas flow to The present invention relates to the installation of a safety valve device in a gas flow path that automatically shuts off the gas flow path.

Figure 4 shows a conventional safety valve device, where 01 is a valve ball and 02 is a safety valve device.
03 is the cylinder, 03 is the valve seat, 04 is the slit, and 05 is the gas flow path, and the flow rate in the gas flow path 05 is the valve ball 01.
In the differential pressure P acting before and after and the weight W of the valve ball, P>
When the valve becomes W, the valve ball 01 floats up and comes into close contact with the valve seat 03 to cut off the flow of gas, and is generally installed in a gas cock called a fuse cock.

In this known example, a gas guide ring 07 is attached to the lower end inlet of the cylinder 02, and a small diameter hole 8 provided in the gas guide ring 07 restricts the inflow of gas into the cylinder 02.

The above-mentioned safety valve device is effective when the hose comes off the gas valve and raw gas spews out, or when the hose is cut, but it cannot be turned on inside a gas appliance.

Malfunction may occur when an OFF type solenoid valve is installed.

The reason for this is that in the case of an ON/OFF type solenoid valve, the gas flow path is instantly opened, so a large pressure difference is instantaneously created before and after the valve ball 01, similar to when an abnormality occurs. This is because the ball is activated.

Therefore, in order to prevent this malfunction, valve ball 01
All you have to do is delay the activation timing a little.

A known example is a gas guide ring 06 having a small diameter hole 07 for this purpose.
However, as shown in the figure, the hole is large, and if there is a large gap between valve ball 01 and cylinder 02, the differential pressure will act on that 11 valve ball 01, causing almost no delay effect. I can't perform.

The purpose of this invention is to propose a means for reliably delaying the actuation timing of the valve body, and its configuration is to install a cylinder with a smaller diameter than the gas flow path in the gas flow path,
The upper mouth of the cylinder communicates with the gas flow passage through a slit, and a valve seat is formed above the upper mouth of the cylinder and above the slit, and a valve body is built into the cylinder so as to be able to float freely. In the safety valve device, a valve body is formed in a piston shape in a cylinder, and a lower end opening of the cylinder is closed, and a /''-fL is provided through which the inside of the cylinder and a gas flow path are communicated,
The size of this small hole is characterized by being large enough to allow only enough gas to flow into the cylinder to act as a brake when the valve body floats up.

With this configuration, when an overflow occurs and the valve body tries to float, the valve body cannot rise suddenly because the amount of gas entering through the small hole is limited, and therefore the valve body cannot be activated. The timing is delayed.

If the differential pressure returns to normal during this time, the valve body will return to its original position 1 due to its own weight.
If the overflow continues, it will continue to float until it reaches the valve seat and stops the gas. Figure 1 shows an embodiment of the present invention, in which 1 is the gas flow path, 2
3 is a safety valve device, 3 is a valve seat, and 4 is a cylinder, the lower end opening of which is closed, and /J4L6 opening in the center.

5 is a valve body inserted into the cylinder 4 in the shape of a piston, and 7 is a slit.

The small hole 6 is set to a size that allows gas to flow into the cylinder 4 to the extent that it acts as a brake when the valve body 5 floats inside the cylinder 4.

Fig. 2 shows a modification of the valve body in which the valve body 5 is spherical and a piston 8 is fixedly attached thereto, and Fig. 3 shows an embodiment of the valve body and piston in which the valve body 5 is formed into a flat plate shape. .

Since the embodiment is configured as described above, when an overflow occurs, a large pressure difference is generated before and after the valve body 5, and the valve body 5 tries to float, but the gas entering the cylinder 4 through the small hole 6 Because of the small amount of the valve body 5, a brake is applied to the floating of the valve body 5 by the action of the piston, and the valve body 5 is unable to rise rapidly, and if there is a momentary overflow during this period, it will end and the valve body 5 will rise due to its own weight. It falls at the original position 1, and when the overflow continues, the valve body 5 floats up with a delay and reaches the valve seat 3, stopping the gas supply.

The above-described structure and operation have the effect that the valve body 5 will not malfunction and stop the gas flow in the event of a momentary overflow.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIGS. 2-3 are views of another embodiment of the valve body, and FIG. 4 is a known example. 1... Gas flow path, 4... Cylinder
5...Valve body, 6...Small hole, γ...
··slit.

Claims (1)

[Scope of utility model registration request] A cylinder with a smaller diameter than this gas flow path is installed in the gas flow path, and the upper opening of the cylinder is communicated with the gas flow path through a slit, and a valve seat is placed above the upper opening of the cylinder and above the slit. In the safety valve device for a gas flow path, the valve body is formed into a piston-like shape within the cylinder, and the lower end opening of the cylinder is closed, and the cylinder is inserted into this closed part. A /J4L is provided to communicate between the inside and the gas flow path, and the size of this small hole is large enough to allow only the amount of gas inflow into the cylinder to act as a brake when the valve body floats up. Safety valve device in gas flow path.