JPH0413511Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquefied petroleum gas release preventer used in piping for propane gas, etc.

Recently, if an earthquake occurs while propane gas is being used in a home or public building, people may forget to close the main gas valve, causing a fire, or the cylinder may topple over due to the earthquake, cutting the gas pipe or falling off from the main valve. Because of this, various types of liquefied petroleum gas emitters have been developed, and the standard operating standards for these gas emitters are tension type and overflow type. It has been decided. This overflow type gas release device has a structure that automatically closes the valve when excessive gas flows through the gas flow path inside the valve body due to damage to the secondary piping, and therefore limits the amount of gas used. There was also slight cracking in the secondary piping,
There is a drawback that the valve does not operate if there is little change in the flow rate in the gas flow path within the valve body. In addition, in the tension type gas release device, as in Utility Model Application No. 141263/1983, the inner end of a stopper that passes through the valve body so as to move back and forth is engaged with a notch in the valve stem to maintain the open state. When tension is applied to the connecting member that connects the outer end and the building, and the stopper retreats and the inner end separates from the notch, the valve stem is actuated by spring force to close the valve. However, in this case, there is no limit to the amount of gas used, and since it operates instantaneously due to vibration, it is highly reliable for its purpose.
However, there was a problem with the structure, which was high cost.

In view of these problems, the present invention aims to provide a tension-type gas release preventer with reliable operating performance at a low cost. and a bearing hole that passes through the valve body and intersects with this gas flow path, and a valve body is pressed into contact with a valve seat provided between the inlet of the gas flow path and the bearing hole. The tip of the valve stem protruding from the bearing hole is inserted into the bearing hole, and a reset guide protrusion is attached to the bearing hole, leaving a notch for engagement of the valve stem and a protrusion cutout behind the notch. A provided movable shaft is inserted so as to be freely forward and backward and rotatable, a gap for gas circulation is formed between the movable shaft and the bearing hole, and both front and rear ends of the movable shaft are held in the bearing hole in an airtight manner, and A flexible shaft is connected to the rear end of the movable shaft, and its free end protrudes rearward from a funnel-shaped guide hole provided at the rear end of the bearing hole, and the front end of the movable shaft protrudes from the valve body and is connected to its tip. A knob is provided, and a spring is interposed between the knob and the valve body, so that the movable shaft can be moved forward at all times to maintain the valve open state.

Hereinafter, one embodiment will be specifically described based on FIGS. 1 to 3.

In FIG. 1, 1 is formed in the valve body 2, and has an inlet 3 on one side of the valve body 2 and an outlet 4 on the other side.
Reference numeral 5 designates a bearing hole that passes through the valve body 2 from the front side to the rear side and intersects the center portion of the gas flow path 1 . Reference numeral 6 denotes a valve body which is pressed from the inlet side by a spring 8 to a valve seat 7 formed between the inlet 3 of the gas flow path 1 and the bearing hole 5. Reference numeral 9 denotes a valve stem that protrudes from the valve body 6, and is slidably fitted into the gas flow path 1 between the valve seat 7 and the bearing hole 5, and has a gas flow groove 9 on the outer periphery over the entire length. ′
is formed, and the tip is made to protrude into the bearing hole 5.
Reference numeral 10 denotes a movable shaft inserted into the bearing hole 5 so that it can move forward and backward and rotate freely, and as shown in the perspective view of FIG.
is provided, and on the rear side there is a ridge cutout 12 and a ridge 13.
A reset guide G consisting of the following is provided. As shown in FIG. 1, a gap a for gas flow communicating with the gas flow path 1 is formed between the movable shaft 10 and the bearing hole 5, and both upper and lower ends of the gap a are
It is hermetically sealed by a ring 14. 15
is a flexible shaft made of a flexible material such as wire connected to the rear end of the movable shaft 10, which projects rearward from the funnel-shaped guide hole 17 of the cylindrical body 16 screwed into the rear end of the bearing hole 5; A connecting portion 19 of a chain 18 for connecting to a building or the like is provided at the free end. 20 is the bearing hole 5
It is a cylindrical knob fixed to the protruding end of the movable shaft 10 that protrudes forward from the front end of the shaft, and the tip of the knob 20 is loosely fitted to the outside of the front end opening 21 of the bearing hole 5 so as to cover it. There is. Further, a spring 22 is installed inside the knob 20 to constantly move the movable shaft 10 forward. Reference numerals 23 and 24 denote a blue display part and a red display part for confirming valve opening and closing, which are double displayed on the outer periphery of the front end opening 21 of the bearing hole 5, and 25 corresponds to both display parts 23 and 24. These are through holes formed at intervals at the tip of the knob 20.

One embodiment of the present invention has the above-mentioned configuration, so the inlet 3 opened on one side of the valve body 2 is connected to the main stopper of the high-pressure cylinder, and the outlet 4 opened on the other side is connected to the pressure reducing regulator. After connecting the connecting part 19 provided at the outer end of the flexible shaft 15 with the connecting chain 18 to a seismic device such as a building or the like in which a sphere falls due to vibration, the main valve of the high-pressure gas cylinder is opened, and as shown in FIG. As shown, in the so-called open state in which the valve stem 9 moves to the left and the valve body 6 is separated from the valve seat 7, tension is applied to the movable shaft 10 due to vibrations of cylinders and buildings due to earthquakes, etc., or the activation of seismic devices. , the movable shaft 10 moves backward against the spring 22, and as shown in FIG. The distal end of the movable shaft 10 engages with the notch 11 to maintain the retracted state of the movable shaft 10, and the valve body 6 comes into pressure contact with the valve seat 7, thereby opening the gas flow path 1.
is shut off, and the outflow of gas to the low pressure regulator side is stopped. In this case, the knob 20 compresses the spring 22 and moves closer to the valve body 2, covering the blue display section 23 and making the red display section 24 visible through the through hole 25, indicating that the gas flow has been stopped. It will be confirmed. Furthermore, when the knob 20 is rotated approximately 1/4 turn in this valve closed state, the tip of the valve stem 9 retreats and separates from the notch 11, and when it moves to the outer surface of the movable shaft 10, the return force of the spring 22 causes the movable shaft 10 to move. moves backward until the flange 13 collides with the valve stem 9. When the knob 20 is further rotated, the flange cutout 12 is positioned on the valve stem 9, so the movable shaft 10 moves back again and is reset to the open state shown in FIG. 1, allowing gas to flow from the high pressure gas cylinder side to the low pressure regulator side. The flow begins. In this case, the knob 20 is separated from the valve body 2 and covers the red display section 24, and a blue display section appears between the tip of the knob 20 and the valve body 2, confirming that the valve is in the open state.

The liquefied petroleum gas release preventer according to the present invention automatically shuts off the gas flow path when tension is applied to the movable shaft due to an earthquake or the like. This flexible shaft, which protrudes from the rear of the valve body through the shaped guide hole, securely holds the movable shaft even if the building or gas cylinder vibrates or falls in a direction other than the direction of the connecting member that connects the building, etc. It can be operated. Further, since the reset operation from the closed state to the open state requires only one turn of the knob, it can be easily handled even by women, and the structure is simple, so it can be provided at a low price.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the liquefied petroleum gas release preventer according to the present invention in the valve open state, Fig. 2 is a longitudinal cross-sectional view showing the same embodiment in the valve closed state, and Fig. 3 is the same as the above. FIG. 3 is a perspective view of a movable shaft in an embodiment. 1... Gas flow path, 2... Valve body, 3... Inflow port, 4... Outflow port, 5... Bearing hole, 6... Valve body,
7...Valve seat, 8...Spring, 9...Valve stem, 1
0... Movable shaft, 11... Notch, 12... Projection cutout, 13... Projection, a... Gap, 14... O
Ring, 15... Flexible shaft, 18... Connection member, 2
0...pick, 22...spring.

Claims (1)

[Scope of utility model registration request] A gas flow path having an inlet on one side and an outlet on the other side is formed in the valve body, and a bearing hole that intersects with the gas flow path and opens on both the front and rear sides of the valve body. A valve body is brought into pressure contact with a valve seat provided between the inlet of the gas flow path and the bearing hole by a spring, and the tip of the valve stem protruding from the valve body is made to protrude into the bearing hole. A movable shaft, which has a notch for engaging the valve stem and a reset guide consisting of a ridge cutout and a ridge on the rear side of the notch, is inserted so that it can move forward and backward and rotate freely. A gap for gas circulation is formed between the shaft and the bearing hole, and both front and rear ends of the movable shaft are held in the bearing hole airtightly, and a flexible shaft made of a flexible material is provided at the rear end of the movable shaft. are connected, and their free ends protrude rearward from a funnel-shaped guide hole provided at the rear end of the bearing hole, and the front end of the movable shaft protrudes from the valve body, and a knob is provided at the protruding end, and the knob and the valve body are connected together. A liquefied petroleum gas release preventer characterized in that a spring is interposed between the movable shaft and the movable shaft in a forward state at all times.