JPH0338526Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a shutoff valve with a built-in shutoff valve in which a gas shutoff valve function is integrated into the shutoff valve.

<Conventional technology> Shutoff valves with fuse fittings generally have a float-shaped valve body suspended in a gas passage, and when the gas flow rate exceeds a predetermined level, the valve body is pressed against the valve seat surface by the flow velocity to shut off the gas passage. It is designed to open the gas passage by restoring the pressure at the end.

On the other hand, gas cutoff valves shut off gas by driving a solenoid in response to an alarm output from a detector such as a gas leak alarm, and various structures are known.

However, each of these has disadvantages; for example, a shutoff valve will not operate unless the amount of gas leaking reaches the operating pressure. Furthermore, the gas cutoff valve depends on the detection sensitivity of the detector.

Therefore, in order to further increase safety, it is necessary to install a shutoff valve with a fuse and a gas cutoff valve in the piping.

<Problem that the invention aims to solve> However, although each of these has various structures as a single unit, there is no one that has both functions.

In addition, the cutoff valve is generally installed in the pipe later, and when a detector is added, the gas cutoff valve is connected to the middle of the existing pipe.

In this case, the piping connection work is troublesome and the number of connections increases, which reduces the reliability and strength of the piping in these parts, and increases extra costs such as construction costs.

Furthermore, when installing a gas cutoff valve outdoors and interlocking it with an indoor alarm, the wiring must be led outside, making wiring and appearance treatment troublesome.

This idea solves the above problems,
By assembling the gas cutoff valve function to the shutoff valve with a fuse, it is possible to share parts in both mechanisms without impairing the functions of both, thereby simplifying the mechanism, simplifying piping connection work, and connecting parts. The purpose is to prevent a decrease in reliability and strength due to an increase in

<Means for solving the problem> In order to achieve the above-mentioned object, this invention includes a valve seat provided in the gas passage of the valve housing, and a valve seat that is loosely fitted in the gas passage opposite to the valve seat, and that is configured to control the gas flow rate. A float-shaped valve element that floats up and contacts the valve seat to cut off the gas passage when the gas exceeds a predetermined amount; A plunger is arranged at the center and projects into the valve housing, and when the solenoid is energized, the plunger is caused to project into the valve housing and press the valve body against the valve seat surface. .

<Example> Hereinafter, an example of this invention will be described in detail using the drawings.

FIG. 1 is an explanatory diagram of gas piping using a shutoff valve with a built-in shutoff valve (hereinafter simply abbreviated as a shutoff valve) 1 according to this invention, and FIG. 2 is a sectional view of the shutoff valve 1.

First, in FIG. 1, a gas cylinder 2, a pressure regulator 3, and a gas meter 4 are connected in series via a gas pipe 5 outdoors. The discharge side gas pipe 5 of the gas meter 4 is drawn into the room R through the outer wall 6,
The aforementioned shutoff valve 1 is connected via piping to the supply end.

A gas stove 8 and other gas-using devices are connected to the discharge port of the shutoff valve 1 via a gas hose 7. A detector 9 such as a gas leak alarm is arranged near the gas stove 8, and its signal cable 10 is connected to the shutoff valve 1.

Note that the conventional gas cutoff valve that is linked to the detector 9 is generally installed as shown in Figure 1A due to the connection space.
The signal cable 10 is also routed through the outer wall 6.

As shown in FIG. 2, the shutoff valve 1 includes a valve housing 10 having a gas supply port 101 at the bottom of one end and a gas discharge port 102 at the top of the other end.
3, a taper part 104 fitted in the upper center of the valve housing 103, and the valve housing 1.
A float-shaped valve body 1 consisting of a hollow sphere loosely fitted into a gas passage 105 formed at the lower center of the valve body 1.
06, a solenoid 107 fixed to the bottom surface of the valve housing 103, and a plunger 108 held within the solenoid 107 and projecting upward from the bottom surface of the valve housing 103.

The lower part of the bottom part 104 has a hollow cylindrical shape, and the valve body 1 is placed inside the hollow part of the cylindrical part 104A.
06 with loose fit and two float supports 1 at the bottom.
09 prevents the valve body 106 from falling off from the socket portion 104.

The upper end of the hollow interior of the cylindrical portion 104A becomes a tapered diameter-reduced portion that constitutes the valve seat surface 104B of the valve body 106, and furthermore, a part of the upper portion thereof has a cock port 104c that communicates this hollow interior with the gas discharge port 102. is formed.

A sealing body 1 made of rubber or the like is provided on the tapered mating surface of the cock part 104 and the valve housing 103.
10 is inserted to airtightly seal the mating surfaces.

Moreover, the upper end of the bottom part 104 is connected to the valve housing 10.
A cover 111 screwed and fixed to the top of the cover 3 protrudes airtightly and rotatably, and its protruding end is connected to a manual opening/closing knob 112.

A reset button 1 is located at the center of the top surface of the knob 112.
13 are arranged. A reset rod 114 is connected to the bottom of the reset button 113. This rod 114 hermetically passes through the center of the rod portion 104, and its lower end is located opposite the upper surface of the valve body 106.

Furthermore, a return spring 11 is attached to the outer periphery of the rod 114.
5 is inserted, and the rod 114 is held in the raised position by the spring force.

The solenoid 107 is attached to a case 116 fixed to the lower surface of the valve housing 103 via screws or the like.
and the plunger 1 in the case 116.
Solenoid coil 117 located on the outer periphery of 08
and the aforementioned signal cable 10 drawn out from the solenoid coil 117, and a magnet 118 provided above the solenoid coil 117,
When the solenoid coil 117 is in a non-energized state, the plunger 108 is attracted to the lower side by the attractive force of the magnet 118, and when the solenoid coil 117 is in an energized state, the plunger 108 is urged to protrude by repulsion.

In addition, the valve housing 103 of the plunger 108
A spring receiver 120 is provided around the side projecting end, and an auxiliary spring 121 is interposed in the spring receiver 120 and the inner bottom surface of the valve housing 103 on the outer periphery of the plunger 108 to urge the plunger 108 to protrude upward. There is.

Next, the operation of the shutoff valve 1 having the above structure will be explained.

First, to close the gas passage manually, press knob 11.
By turning 2, the socket portion 104 rotates, and the connection between the socket port 104c and the discharge port 102 is cut off.

Next, gas leakage occurs when the discharge port 102 is open, and when gas flows at a flow rate higher than a predetermined flow rate, the floating valve body 106 lifts up, and these are moved to the valve seat surface 104.
By touching B, the passage is blocked.

Note that this action is generally the same as that of a hyuzukotoku.

Further, when a gas leak is detected by the detector 9, the solenoid coil 117 is excited via the signal cable 10 by the detection output, and the plunger 108 is caused to protrude by the repulsive force and the urging force of the auxiliary spring 121. push up,
The passage is blocked by pushing up against the valve seat surface 104B.

The above-mentioned automatic shutoff action can be performed alone or by a combined action of both.

Since the valve body 106 is light, it remains stuck to the valve seat surface 104B even when the plunger 108 is returned. If the reset button 113 is pressed at this time, the rod 114 is lowered, pushing the valve body 106 and separating it from the valve seat surface 104B. If the gas-using equipment returns to normal and the indoor gas is ventilated, the valve body 106 returns to its original floating state and gas is flowing normally. If there is a leak on the equipment side and there is no ventilation, the gas passage will be blocked again by the same mechanism as described above.

<Effects of the invention> As explained in detail in the examples above, according to this invention, a gas cutoff valve function can be added without impairing the function of a conventional shutoff valve with a fuse valve, and Compared to the case where a single unit is incorporated into the gas piping, piping connections can be made more easily, there is no decrease in reliability or strength due to the increase in the number of connection points, and the installation can be done at low cost.

As shown in the embodiment, when installing the product of the present invention at the end of a gas pipe, it is only necessary to replace the conventional shutoff valve, and the wiring for the detector can be indoor wiring, which further simplifies the installation.

Further, since the solenoid only requires a torque sufficient to operate the lightweight float-shaped valve body, it is lightweight, small, and inexpensive.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of gas piping using a shutoff valve with a built-in shutoff valve according to this invention, and FIG. 2 is a sectional view of the shutoff valve. 1...Built-in shutoff valve, 101...Gas supply port, 102...Gas discharge port, 104B...
... Valve seat surface, 106 ... Float-shaped valve body, 107
... Solenoid, 108 ... Plunger.

Claims (1)

[Scope of utility model registration request] A valve seat provided in the gas passage of the valve housing, and a float-shaped valve that faces the valve seat and is loosely fitted into the gas passage, and when the gas flow rate exceeds a predetermined amount, it floats up and comes into contact with the valve seat, blocking the gas passage. a solenoid fixed to the valve housing at a face facing the valve seat with the valve body in between, and a plunger disposed at the center of the solenoid and protruding into the valve housing, and excitation of the solenoid. A shutoff valve with a built-in shutoff valve, characterized in that the plunger is made to protrude into the valve housing to press the valve body against the valve seat surface.