JPH078936Y2 - Safety valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field and outline of the invention] The present invention relates to a safety valve device that automatically shuts off a gas circuit when a gas leaks, such as when a gas rubber pipe connected to a gas appliance is disconnected. When the pressure on the secondary side in the valve device body falls below a certain level, this pressure drop is detected and the gas circuit is automatically shut off, so that the concentration of the gas leaked into the room becomes a certain amount. It is intended to improve the responsiveness of the conventional safety valve device of this kind, which detects the reaching and performs the valve closing operation.

[Prior Art and its Problems] As a safety valve device for a gas circuit, for example, Japanese Patent Publication No. 55-3016
There is something like that described in Japanese Patent Publication No. 7.

This has a structure as shown in FIG. 5, and has an electromagnet (M) that loses its attractive force due to the output of a gas leak detector (G) arranged on the wall surface of the room and the like, and is absorbed by the electromagnet (M). First
An iron piece (F) biased by a spring (11) in a direction away from the electromagnet (M), and the iron piece (F) provided concentrically with the cylindrical electromagnet (M) and at one end. And the valve seat opening (1) facing the other end of the operating shaft (S) and pushed by the other end.
0) and a lift valve (1) that is opened and a second spring (12) that biases the lift valve (1) toward the valve seat opening (10) corresponding thereto. There is.

When the operating shaft (S) is pushed in to open the lift valve (1), at the same time, the iron piece (F) attached to one end of the operating shaft (S) is adsorbed and held by the electromagnet (M), and ,
The lift valve (1) is kept open.

In this case, when gas leak occurs due to disconnection of the gas rubber pipe connected to the gas appliance, this is detected by the gas leak detector (G) arranged on the wall surface in the room, and the detection output thereof. The electric supply to the electromagnet (M) is cut off by the electromagnet (M), so that the electromagnet (M) loses its attractive force.
Then, the elastic force of the first spring (11) causes the operating shaft (S) to move.
Returns and the lift valve (1) returns to the closed state.
As a result, it is possible to prevent a raw gas discharge accident due to the gas rubber pipe coming off or the like.

However, in the above-mentioned conventional one, the lift valve (1) does not close unless the leaked gas fills the room to some extent.
There was a problem that the responsiveness of the safety valve device was not good.

This is because in the above-mentioned conventional one, the lift valve (1) is closed by the output of the gas leak detector (G) that detects the gas that has already leaked.

That is, in the case of the above-mentioned conventional one, since the lift valve (1) is closed by detecting the gas that has already leaked into the room, the leaked gas fills the room to some extent and the gas leak detector (G 2) does not operate, the lift valve (1) does not close, and the response of the safety valve device deteriorates because the operation of the safety valve device is delayed until the leaked gas fills the room.

[Technical Problem] The present invention aims to improve the responsiveness of the safety valve device in such a "safety valve device which is opened by a manual opening operation and closes when a gas leak occurs on the downstream side". Therefore, it is a technical issue to close the lift valve (1) by detecting a pressure drop in the downstream gas circuit that occurs when gas leaks.

[Means] The technical means of the present invention taken to solve the above-mentioned problem is that "two valve chambers partitioned by a collar (3) surrounding the gas passage port and the valve chamber on the downstream side are accommodated. An auxiliary lift valve (15) facing the valve seat on the downstream side of the gas passage opening and closed by a manual pushing operation against the second spring (20) for urging the valve, and the auxiliary lift valve (15). A leak hole (21) formed in the valve (15) and a valve seat on the upstream side of the gas passage opening are provided so as to face the auxiliary lift valve (15) in the upstream valve chamber. The first spring (1
6) urged by the main lift valve (1), an electromagnet (M) that holds the main lift valve (1) in an open state, and further detects a pressure rise in the valve chamber on the downstream side. A pressure sensitive switch (18) that operates is provided so that when the auxiliary lift valve (15) is moved to the upstream side, the auxiliary lift valve (15) is pushed by this and the main lift valve (1) is moved to the upstream side. The electromagnet (M) is kept energized by the output signal of the pressure switch (18). "

[Operation] The above technical means operates as follows.

When the auxiliary lift valve (15) is pushed in and closed when gas is not leaking on the downstream side in a normal condition, the main valve arranged coaxially with the auxiliary lift valve (15) on the upstream side. The lift valve (1) is opened by being pushed by the auxiliary lift valve (15) which is pushed and opened.

When the main lift valve (1) is opened and the auxiliary lift valve (15) is closed, the gas supplied from the main lift valve (1) is located on the downstream side of the auxiliary lift valve (15). Discharge through the leak hole (21) of (15) into the flow passage on the downstream side of the flow passage closing portion of the auxiliary lift valve (15),
As a result, the gas pressure in the downstream passage increases.

When the pressure in the flow passage on the downstream side of the flow passage closing portion of the auxiliary lift valve (15) rises, a pressure sensitive switch (18) that operates by detecting the pressure rise outputs an output signal, and the electromagnet ( M) is kept energized, and the electromagnet (M) holds the main lift valve (1) in the open state.

Next, when the pushing force acting on the auxiliary lift valve (15) is released, the auxiliary lift valve (15) returns to the open state by the urging force of the second spring (20) applied to the auxiliary lift valve (15). To do.

This allows the main lift valve (1) and the auxiliary lift valve (1
In the case of 5), both valves are opened and gas is supplied to the downstream gas circuit.

Next, in the gas supply state, when the gas rubber pipe connected to the gas appliance on the downstream side is disconnected and a gas leak occurs, the pressure in the gas circuit decreases, and the pressure sensitive switch (18) Upon detection, the pressure sensitive switch (18) stops producing a signal.

Then, the electromagnet (M), which is maintained in the energized state only when the pressure-sensitive switch (18) outputs a signal,
When the signal from the pressure sensitive switch (18) disappears, the main lift valve (1) cannot be held in the open state due to the non-energization state.

When the electromagnet (M) cannot hold the main lift valve (1) in the open state, the main lift valve (1) is moved in the valve closing direction by the first spring (16) acting on the main lift valve (1). The gas circuit is cut off. That is, the gas supply to the downstream side is automatically cut off to ensure a safe state.

Even when the auxiliary lift valve (15) is pushed in to open the safety valve device and the gas rubber pipe for the instrument on the downstream side is already disconnected and gas leakage occurs, the auxiliary lift valve (15) Since the pressure in the gas circuit on the downstream side does not rise and the pressure sensitive switch (18) does not output a signal, the electromagnet (M) for opening the main lift valve (1) is not energized, and The main lift valve (1) has a corresponding first
The urging force of the spring (16) keeps the valve closed. That is, when the downstream gas circuit is in a gas leak state when the safety valve device is opened, the safety valve device does not open.

[Effect] Since the main lift valve (1) is closed by detecting the pressure drop in the downstream gas circuit that occurs when a gas leaks, the gas leak detector does not operate until the leaked gas fills the room to some extent. The safety valve device operates more promptly and its responsiveness is improved as compared with the above-mentioned conventional one in which the main lift valve (1) is closed by the detection output of.

Further, at the time when the main lift valve (1) is opened by the pushing operation, the gas passage port on the downstream side is closed by the auxiliary lift valve (15) and the leak hole (2
Since a small amount of gas only flows to the downstream side through the communication by 1), even if the opening operation is accidentally performed even if the rubber pipe in the downstream circuit is disconnected, the gas outflow amount is very small. Since it is a small amount, a large amount of gas leakage in such a situation can be prevented and it is safe.

[Embodiment] Next, an embodiment in which the present invention is applied to a gas cock will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the apparatus body (6) has a straight gas flow path (5) extending from the gas inlet (5) to the gas outlet (50).
1) is formed, and the main lift valve (1) and the auxiliary lift valve (1) are arranged in the gas flow path (51) from the upstream side thereof.
5), the cam body (53) and the hose end (52) are arranged in this order, and the gas flow path (51) located between the main lift valve (1) and the auxiliary lift valve (15) is A collar (3) is provided around the inner peripheral wall. The upstream opening peripheral edge of the collar (3) constitutes a first valve seat (14) which is opened and closed by the main lift valve (1), and the downstream opening peripheral edge of the flange (3). Is a second valve seat (17) that is opened and closed by the auxiliary valve lift (15).

The main lift valve (1) has a corresponding first valve seat (1
4) is urged by the first spring (16), and at the other end of the valve shaft (13) with the main lift valve (1) attached at one end, an iron piece (41) is provided. An electromagnet (M) is provided in a portion that is provided and faces the iron piece (41).

The auxiliary lift valve (15) arranged on the downstream side of the main lift valve (1) is provided with a leak hole (21) and between the auxiliary lift valve (15) and the apparatus main body (6). Second to
A spring (20) is interposed to urge the auxiliary lift valve (15) in the downstream direction. And, by the biasing force,
The tip of the valve shaft (22) protruding downstream from the auxiliary valve lift (15) is brought into contact with the cam body (53) moving in the direction orthogonal to the gas flow path (51). .

The cam body (53) is composed of a conical portion (54) and a cylindrical portion (55) continuous with the end on the small diameter side, and the conical portion (54) of the cam body (53). The side end is the operating shaft (40)
It is attached to the lower end of the. Also, the other cylindrical part (5
5) is externally fitted to a guide shaft (56) planted in the device body (6), and is located between the tip end of the cam body (53) on the cylindrical portion (55) side and the device body (6). A compression spring (57) is interposed in this.

Next, a pressure outlet hole (61) is bored in the side wall portion of the downstream side passage of the second valve seat (17), and the gas in the passage is passed through the pressure outlet hole (61). Pressure-sensitive switch (18)
To be transmitted to.

Inside the hose end (52) arranged at the downstream end of the gas flow path (51), a slide stopper (64) biased to the downstream side by a spring (65) is housed. The tapered valve portion formed on the outer periphery of the tip end of (64) is connected to the tapered valve seat (6 formed on the inner periphery of the tip end of the hose end (52).
It is designed to approach and separate from (0).

In FIG. 1, (63) is a socket removal lever for removing a socket (9), which will be described later, attached to the hose end (52), and one end of the socket removal lever (63) , The socket release button (62) is swingably attached by the connecting pin (66), and the central portion of the socket release lever (63) swings to the device body (6) by the support shaft (67). It is fixed freely. A kick spring (68) for urging the swinging tip of the socket removing lever (63) toward the tip of the hose end (52) is arranged on the support shaft (67). Further, in the case of this embodiment, when the swing tip of the socket release lever (63) is pushed toward the apparatus main body (6) side in the vicinity of the socket release lever (63), it is A socket confirmation switch (not shown) formed of a limit switch or the like that comes into contact with and is turned on is provided, whereby the main lift valve (unless the socket (9) is connected to the hose end (52). In 1), the valve cannot be kept open.

FIG. 2 is an electric wiring diagram of the pressure sensitive switch (18) and the electromagnet (M). The outputs of the pressure sensitive switch (18) and the socket confirmation switch (7) are applied to the AND circuit (71). ,
The output of the AND circuit (71) is applied to the base of the transistor (72) for turning on and off the electromagnet (M).

Next, the actual use of the safety valve device according to the embodiment of the present invention will be described.

In the initial state in which the socket (9) is not attached to the hose end (52), the main lift valve (1) is closed by the first spring (16) and the auxiliary lift valve (15) as shown in FIG. The second springs (20) keep the valves open.

When the socket (9) connected to the tip of the gas rubber tube of the gas appliance is connected to the hose end (52), a part of the socket (9) comes into contact with the swinging tip of the socket removal lever (63). The socket release lever (63) is swung to rotate the socket confirmation switch (7). Further, as shown in FIG. 3, when the socket (9) is connected, the valve opening rod (90) provided in the socket (9) has a slide stopper (64) in the hose end (52).
Is pushed upstream to open this valve.

Next, when the operating shaft (40) is pushed in, the operating shaft (40) moves below the cam body (53) that is connected to the tip of the operating shaft (40), and the conical portion (54) of the cam body (53) is moved. And valve stems for auxiliary valve lifts (22)
The contact of the auxiliary lift valve (15) moves in the upstream direction to bring it into contact with the second valve seat (17). When the auxiliary lift valve (15) moves upstream, the auxiliary lift valve (15) pushes the main lift valve (1) to move in the upstream direction, whereby the main lift valve (1) moves. The valve opens.

When the main lift valve (1) is opened and the auxiliary lift valve (15) is closed, the auxiliary lift valve (15) is leaked through the leak hole (21) formed in the auxiliary lift valve (15). The gas is discharged to the downstream side, and the pressure in the downstream circuit rises.

When the pressure rises in the downstream circuit of the auxiliary lift valve (15), the pressure-sensitive switch (18) is turned on by detecting this, and the output of the pressure-sensitive switch (18) outputs the socket confirmation switch (7). ) And the state of being applied to the AND circuit (71), and a signal is output from the AND circuit (71) to activate the transistor (72). Then, the electromagnet (M) inserted in the collector circuit of the transistor (72) becomes conductive, and the electromagnet (M) becomes the main lift valve (1).
The iron piece (41) attached to the valve shaft (18) is adsorbed and held in this state. That is, the main lift valve (1) is kept open.

When the pushing force acting on the operating shaft (40) is released while the main lift valve (1) is held in the open state, the operating shaft (40) is compressed by the compression springs (57), (58). The auxiliary lift valve (15) is also moved in the valve opening direction by the action of the second spring (20).

As a result, the gas circuit is opened, and the gas flowing in from the gas inlet (5) has the main lift valve (1) → first valve seat (14) → second valve seat (17) → cam body (53). ) Housing →
The gas goes to the hose end (52) and is supplied from the socket (9) to the gas appliance on the downstream side (see FIG. 4).

Next, in the gas supply state, when a gas leak occurs due to disconnection of the gas rubber pipe connected to the gas appliance on the downstream side, a pressure drop occurs in the gas circuit.

When a pressure drop occurs in the gas circuit, the pressure sensitive switch (18) detects this and the pressure sensitive switch (18) stops outputting a signal, and one input signal of the AND circuit (71) is in the L state. Therefore, the AND circuit (71) does not output a signal,
The output signal of the AND circuit (71) which has output the H signal changes to "L" and the transistor (72) is turned off. As a result, the supply of electricity to the electromagnet (M) is cut off, and the electromagnet (M) loses its adsorbing power and does not hold the adsorbed iron piece (41) in this adsorbed state.
The main lift valve (1) held in the open state by the adsorption of the iron piece (41) moves in the valve closing direction by the urging force of the first spring (16) acting on the main lift valve (1). Then, the first valve seat (14) is closed. That is, the gas circuit is cut off.

Next, when the socket (9) is connected to the hose end (52) and the gas leak does not occur in the downstream gas circuit, and the socket release button (62) is pressed in, the socket works in conjunction with this. The disengagement lever (63) oscillates around the support shaft (67) as the oscillating fulcrum, and the oscillating tip of the socket disengagement lever (63) abuts the socket (9). Push it away from the device body (6) and remove it.

Socket (9) removed and socket release lever (63)
When the socket swings back to the initial state, the socket confirmation switch (7), which was in the ON state when the socket (9) was connected, returns to the OFF state due to the swinging of the socket removal lever (63) to return to the AND circuit (71). ) Output changes from H to L and the transistor (72) is cut off. As a result, the electromagnet (M) is deenergized, and the main lift valve (1) returns to the closed state by the urging force of the first spring (16).

In addition, when the operation shaft (40) is pushed in to open the safety valve device and the gas rubber pipe for the instrument on the downstream side is already detached and gas leakage occurs, the auxiliary lift valve (15) The pressure does not rise in the gas circuit on the downstream side, and the pressure sensitive switch (1
Since 8) does not turn on, the electromagnet (M) for opening the main lift valve (1) is not energized, and the main lift valve (1) has a corresponding first spring (16). The urging force of the valve keeps the valve closed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a conceptual diagram showing the electrical relationship of electric parts, and FIGS.
FIG. 5 is an explanatory view of a conventional example, in which (15) ... auxiliary lift valve (16) ... first spring (18) ... pressure switch (20) ... second spring (21) ... … Leak hole (M) …… Electromagnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroo Kinoshita 5-1 Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka Osaka Gas Co., Ltd. (56) Reference JP-A-62-215173 (JP, A) JP-A-SHO 59-187178 (JP, A) Actually open 62-130275 (JP, U) Actually open 1-89683 (JP, U) Actually open 64-24783 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A safety valve device which is opened by a manual opening operation and closed when a gas leak occurs on the downstream side, in which two valve chambers are defined by a collar (3) surrounding a gas passage port. And a valve seat which is housed in the valve chamber on the downstream side, faces the valve seat on the downstream side of the gas passage port, and is closed against the second spring (20) for urging the valve by manual pushing operation. Auxiliary lift valve (15) and this auxiliary lift valve (15)
And a leak hole (21) formed in the valve chamber on the upstream side so as to face the auxiliary lift valve (15) in the valve chamber on the upstream side and to come into contact with a valve seat on the upstream side of the gas passage port. A main lift valve (1) biased by a first spring (16), an electromagnet (M) for holding the main lift valve (1) in an open state, and further, a pressure increase in the valve chamber on the downstream side. And a pressure-sensitive switch (18) for detecting and operating the auxiliary lift valve (15) when the auxiliary lift valve (15) is moved upstream so that the main lift valve (1) is moved upstream. And a safety valve device for maintaining the electromagnet (M) in an energized state by an output signal of the pressure sensitive switch (18).