JPH0632529Y2 - Shut-off valve built-in stop valve - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a shut-off valve built-in shut-off valve in which a function of shutting off gas in conjunction with an alarm output of a gas leak alarm is integrally assembled with the shut-off valve.

<Prior art> A shutoff valve with a fuse cock generally floats a float-shaped valve element in a gas passage, and when the gas flow rate exceeds a predetermined value, the valve element is pressed against the valve seat surface by the flow velocity and shuts off the gas passage. It has a functioning structure and opens the gas passage by recovering the pressure at the end.

On the other hand, the gas shutoff valve shuts off gas by driving a solenoid in response to an alarm output of a gas leak alarm device, and various structures are known.

However, each of them has disadvantages, for example, the shutoff valve does not operate unless the amount of gas leakage reaches the operating pressure. Further, the gas cutoff valve depends on the detection sensitivity on the gas leak alarm side.

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

<Problems to be solved by the invention> However, although these have various structures as individual units, none have the functions of both.

In general, the shutoff valve is built into the pipe later,
With the addition of gas leak alarms, etc., a gas shutoff valve will be connected in the middle of the existing piping.

In this case, since the pipe connecting work is troublesome and the number of connecting portions is large, reliability and pipe strength in this portion are lowered, and extra costs such as construction costs are required.

Further, when the gas shutoff valve is installed outdoors and interlocked with the alarm device on the indoor side, the wiring has to be drawn out outdoors, and the wiring arrangement and external appearance processing are troublesome.

This invention solves the above problems, and by installing a gas shut-off function linked to a gas leak alarm in a stop valve with a fuse cock, the parts of both mechanisms can be protected without impairing their functions. The purpose of the present invention is to share the structure, thereby simplifying the mechanism, simplifying the pipe connection work, and preventing the reliability and strength from being reduced due to an increase in the number of connection parts.

<< Means for Solving Problems >> In this invention, the room (R) is located at the end of the gas pipe (5).
Which is a stop valve located at a position immediately before a gas-using device (8) such as a gas stove for opening and closing gas to and from the gas-using device (8), the gas passage (1) of the valve housing (103).
05), the valve seat (104B) and this valve seat (104B)
B) is loosely fitted into the gas passageway (105), and when the gas flow rate exceeds a predetermined amount, it floats up and rises to the valve seat (104).
A float-shaped valve body (106) which is in contact with B) and shuts off the gas passage (105); and a solenoid (107) fixed to the valve housing (103) under the valve body (106). A plunger (108) disposed at the center of the solenoid (107) and capable of projecting toward the valve body (106) in the valve housing (103)
And a signal cable (10) to the solenoid (107)
And a gas leak alarm (9) provided in the room (R), the gas leak alarm (9)
The solenoid (107) is excited by the alarm output of the above, the plunger (108) is projected into the valve housing (103), and the valve body (106) is pressed against the valve seat (104B). Characterize.

<Operation> In the device configured as described above, for example, when a gas leak occurs in the gas using device (8) or the like and the gas flow rate exceeds a predetermined amount, the float valve body (106) floats,
Block valve seat (104B) to prevent gas leaks immediately. That is, this gas leak can be prevented immediately before the gas leak is detected by the gas leak alarm (9). In addition, when the gas gradually leaks from the gas using device (8) or the like, the valve body (106) does not float due to the flow of the gas, and therefore the valve seat (104B) is caused by the flow rate of the gas. Never close. However, the gas leak alarm (9) detects the leaked gas, which drives the solenoid (107) so that the valve body (106) is forced against the valve seat (104B) via the plunger. Become. Therefore, even if the gas is gradually leaking, it is possible to reliably prevent the gas from leaking.

Further, as described above, the valve body (106) is floated to float, and the first action of closing the valve seat (104B) and the valve body (106) are forcedly moved by the solenoid (107) and the like. , And the second action of closing the valve seat (104B) together, simplification of the pipe connecting work as compared with the case of separately connecting those each having these individual actions to the gas pipe. Can be achieved. Moreover, since the number of connecting parts of the pipe is reduced, it is possible to prevent the reliability and strength of the connecting parts from being lowered. Further, since the valve body (106), the valve seat (104B) and the like are common members, the internal mechanism can be simplified as compared with the case where the two functions having the above two functions are simply combined.

Further, in general, the shutoff valve having the first action is generally fixed to the wall of the room (R) and used, and therefore the shutoff valve having the second action is attached to the outdoor wall. However, since the gas leak alarm (9) is installed in the room (R), wiring the signal cable (10) from the gas leak alarm (9) to the shutoff valve is troublesome, such as passing through a wall. It becomes work. On the other hand, in the present invention, since the one having the second action is integrated with the one having the first action in the room (R), the wiring work of the signal cable (10) is performed. It will be extremely easy.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

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

First, in FIG. 1, the gas cylinder 2, the pressure regulator 3 and the gas meter 4 are connected to the outside in series via a gas pipe 5. The gas pipe 5 on the discharge side of the gas meter 4 is drawn into the room R through the outer wall 6, and the above-mentioned shut-off valve 1 is connected to its supply end by piping.

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

Note that the conventional gas cutoff valve unit that interlocks with the detector 9 is generally provided with a shutoff valve on the wall of the room (R), and the outdoor space surrounded by the same FIG. It was incorporated in the gas pipe 5, and the signal cable 10 was also wired through the outer wall 6.

As shown in FIG. 2, the shutoff valve 1 has a gas supply port 101 at the lower end of one end and a gas discharge port 102 at the upper end of the other end.
A valve housing 103 and a valve housing 1 in which
Cock part 104 fitted in the upper center of 03 in a taper shape
A float valve body 106 formed of a hollow sphere that is loosely fitted in a gas passage 105 formed in the lower center of the valve housing 103, a solenoid 107 fixed to the lower surface of the valve housing 103, and a solenoid 107. Retained,
The bottom surface of the valve housing 103 is provided with a plunger 108 protruding upward.

The lower portion of the cock portion 104 has a hollow cylindrical shape, and the valve body 106 is loosely fitted and held inside the hollow portion of the cylindrical portion 104A, and two float supports 109 are arranged at the lower portion of the valve body 106 to prevent the valve body 106 from moving. It is prevented from falling off from the cock portion 104.

The upper end of the hollow interior of the cylindrical portion 104A is the valve body 106.
Of the valve seat surface 104 </ b> B of the gas discharge port 10.
A cock port 104c communicating with the two is formed.

A sealing body 10 made of rubber or the like is inserted between the tapered mating surfaces of the cock portion 104 and the valve housing 103 to hermetically seal the mating surfaces.

A cover 111 screwed and fixed to the top of the valve housing 103 projects in an airtight and rotatable manner at the upper end of the cock 104, and the projecting end is connected to a manual opening / closing operation knob 112.

A reset button 113 is arranged at the center of the top surface of the knob 112. A reset rod 114 is coupled to the lower portion of the reset button 113. This rod 114
Penetrates through the center of the cock portion 104 in an airtight manner, and the lower end thereof is located opposite to the upper surface of the valve body 106.

Further, a return spring 115 is inserted in the outer peripheral portion of the rod 114, and the spring force holds the rod 114 in the raised position.

The solenoid 107 includes a case 116 fixed to the lower surface of the valve housing 103 via a screw or the like, and a case 116.
The solenoid coil 117 is provided inside the solenoid coil 117 and is located on the outer circumference of the plunger 108, the above-described signal cable 10 drawn out from the solenoid coil 117 to the outside, and the magnet 118 provided on the solenoid coil 117. In the non-excited state, the attraction force of the magnet 118 attracts the plunger 108 to the lower side, and the repulsion in the excited state urges the plunger 108 to project.

Further, a spring receiver 120 is provided around the protruding end of the plunger 108 on the valve housing 103 side, and the spring receiver 120 and the inner bottom surface of the valve housing 103 on the outer periphery of the plunger 108 assist for urging the plunger 108 to protrude upward. The spring 121 is interposed.

The gas leak alarm device 9 supplies a drive pulse and a return pulse signal to the solenoid in accordance with a gas detection unit, an alarm unit such as a buzzer that issues an alarm when the detection value of the gas detection unit exceeds a predetermined value, and the detection output. And a drive control unit for outputting.

Next, the operation of the stop valve 1 having the above configuration will be described.

First, in a normal use state, in order to manually close the gas passage, the knob 112 is turned to rotate the cock portion 104, so that the cock port 104c and the discharge port 102 are shut off from each other.

Next, gas leakage occurs when the discharge port 102 is open, and when a gas of a predetermined flow rate or more flows, the floating valve body 106 floats up and contacts the valve seat surface 104B, thereby blocking the passage.

Note that this action is generally the same as that of the fuse cock.

Further, when the gas leak alarm 9 detects a gas leak, an alarm is generated by the detection output.

At the same time, a drive pulse signal is output, and the solenoid coil 117 is excited via the signal cable 10. Then, the repulsive force due to the excitation and the urging force of the auxiliary spring 121 cause the plunger 108 to project and push up the valve body 106, and push up to the valve seat surface 104B to block the passage, and hold this state.

The above automatic blocking action is performed by a single action or a combined action of both.

When the return pulse signal is output from the gas leak alarm 9 by manual or automatic return action, the plunger 108 is lowered to the original position and is kept in that state. However, since the valve body 106 is light, it remains attached to the valve seat surface 104B even when the plunger 108 is returned.

At this time, if the reset button 113 is pushed, the rod 114 descends and pushes the valve body 106 to separate it from the valve seat surface 104B. If the equipment using gas returns to normal and the indoor gas is being ventilated, the valve body 106 will be in the original floating state,
Gas is normally distributed. If there is a leak on the device side or ventilation is not provided, the gas passage will be blocked again by the same mechanism as described above.

<< Effects of the Invention >> According to this invention, for example, when a gas leak occurs in the gas using device (8) or the like and the gas flow rate becomes a predetermined amount or more, the float-shaped valve body (106) floats up to the valve seat. (104B) is closed to prevent gas leakage immediately. That is, this gas leak can be prevented immediately before the gas leak is detected by the gas leak alarm (9). Further, when the gas gradually leaks from the gas using device (8) or the like, the valve body (106) does not float due to the flow of the gas, and therefore the valve seat (10) depends on the flow rate of the gas.
4B) never closes. However, the gas leak alarm (9) detects the leaked gas, and the solenoid (107) is driven by this, and the valve body (10) is driven through the plunger.
6) is forced to be pressed against the valve seat (104B). Therefore, even if the gas is gradually leaking, it is possible to reliably prevent the gas from leaking.

Further, as described above, the valve body (106) is floated to float, and the first action of closing the valve seat (104B) and the valve body (106) are forcedly moved by the solenoid (107) and the like. , And the second action of closing the valve seat (104B) together, simplification of the pipe connecting work as compared with the case of separately connecting those each having these individual actions to the gas pipe. Can be achieved. Moreover, since the number of connecting parts of the pipe is reduced, it is possible to prevent the reliability and strength of the connecting parts from being lowered. Further, since the valve body (106), the valve seat (104B) and the like are common members, the internal mechanism can be simplified as compared with the case where the two functions having the above two functions are simply combined.

Further, in general, the shutoff valve having the first action is generally fixed to the wall of the room (R) and used, and therefore the shutoff valve having the second action is attached to the outdoor wall. However, since the gas leak alarm (9) is installed in the room (R), wiring the signal cable (10) from the gas leak alarm (9) to the shutoff valve is troublesome, such as passing through a wall. It becomes work. On the other hand, in the present invention, since the one having the second action is integrated with the one having the first action in the room (R), the wiring work of the signal cable (10) is performed. It will be extremely easy.

When the product of the present invention is attached to the end of the existing gas pipe, it is only necessary to replace it with a conventional stop valve, and the wiring for the gas leak alarm (9) may be indoor wiring, which simplifies the installation.

Further, since the solenoid (107) has a torque sufficient to operate the lightweight float valve body (106), the solenoid (107) is lightweight, compact and inexpensive.

[Brief description of drawings]

FIG. 1 is an explanatory view of gas piping using a shutoff valve built-in shutoff valve according to the present invention, and FIG. 2 is a sectional view of the shutoff valve. 1 ... Shut-off valve built-in shut-off valve 9 ... Gas leak alarm 10 ... Signal cable 101 ... Gas supply port 102 ... Gas discharge port 104B ... Valve seat surface 106 ... Float-shaped valve element 107 ... Solenoid 108 ... Plunger

Claims (1)

[Scope of utility model registration request] 1. A gas pipe (5) at the end of which is located in a room (R) and immediately before a gas using device (8) such as a gas stove for opening and closing gas to this gas using device (8). A shut-off valve for carrying out, a valve seat (104B) provided in a gas passage (105) of a valve housing (103), a valve seat (104B) facing the valve seat (104B), loosely fitted in the gas passage (105), and When the gas flow rate exceeds a predetermined amount, it floats and comes into contact with the valve seat (104B), and shuts off the gas passage (105).
A solenoid (107) fixed to the valve housing (103) below the valve body (106), and arranged in the center of the solenoid (107) and inside the valve housing (103). A plunger (108) capable of projecting toward the valve body (106) is connected to the solenoid (107) via a signal cable (10),
A gas leak alarm (9) provided in the room (R) is provided, and the solenoid (107) is excited by the alarm output of the gas leak alarm (9) to cause the plunger (108) to move to the valve housing ( 103) to project into the valve body (10
A shut-off valve built-in shut-off valve characterized in that 6) is urged against the valve seat (104B).