JP2001336654A - Gas emission preventer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas emission preventer having a high reliability of such a structure as not shutting off in a momentarily overflow condition which is not abnormal and shutting off in an overflow condition which is continued for the specified period of time. SOLUTION: A shutoff valve mechanism 3 held in a body 2 having flow passages 2a and 2b taking the open position with the aid of a retention spring 16 makes shutting-off with gas pressure and is equipped with a case 5 held by the retention spring 16, an auxiliary rod 6 fitted with an auxiliary passage 13 attached to the front of the case 5, and a ball valve 8 installed in the case and stored inside a guide member movably for opening and closing the auxiliary passage 13, wherein if the gas flow becomes a temporary overflow condition, the case 5 moves to shut the passages 2b and 2c to allow the gas to flow from the auxiliary passage 13, and in the case the overflow condition continues, the auxiliary passage 13 is choked to generate the shutoff condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas release preventer used in a bulk supply device for supplying liquefied petroleum gas (hereinafter abbreviated as LPG) to, for example, household gas appliances. The present invention relates to a gas emission preventer having a shut-off valve that shuts off a flow path when a flow rate becomes equal to or more than a set value.

[0002]

2. Description of the Related Art LPG from bulk storage to household gas appliances
It is obligatory to install a gas emission preventer in a consumer bulk supply device that supplies gas.

[0003] As such a gas emission preventing device, FIG.
As shown in FIG. 1, a device provided with a shut-off valve 23 is generally used. That is, the closing valve 23 is roughly constituted by a valve seat member 25 fixed in the body 22 and a valve body 26 fixed to the shaft 33. The valve seat member 25 has a flow path 27 formed in the center, and is screwed and fixed into the body 22 via a screw portion 28 formed on the outer periphery, and the tapered hole 30a is formed.
Is in contact with the rear surface of the partition portion 30 in which is formed.
A guide member 32 having a groove 31 formed on the outer periphery is fixed to the rear surface of the valve seat member 25.

The valve body 26 is fixed to the tip of a shaft 33 slidably inserted into the guide member 32, and a stopper 29 is provided at the rear end of the shaft 33 to contact the guide member 32. An O-ring 34 is attached to the outer periphery of the valve body 26. A spring 35 is mounted between the valve body 26 and the guide member 32, whereby the valve body 26 is urged rightward in FIG. 4 together with the shaft 33.

[0005] The gas flow 36 exiting the gas pipe is supplied to the flow path 22a.
When the gas flow rate exceeds the set value, the valve body 26 is pressed against the spring 35 by the gas pressure and pressed against the valve seat member 25, and the gas flows between the flow path 22a and the flow path 22b. Is to be shut off.

[0006]

As described above, the conventional gas emission preventing device always shuts off the flow passages 22a and 22b when the gas flow is in an overflow state. Even cut off. Therefore, for example, when the instantaneous excessive flow occurs in the normal state of the combustor, or when the differential pressure inside the supply pipe is large, the instantaneous excessive flow state is not abnormal, and the gas supply is stopped. There is a problem that it is inconvenient for the consumer because it is stopped.

The present invention has been made in view of the above points, and is not interrupted in an instantaneous overflow state that is not abnormal, but is interrupted in an overcurrent state that continues for a predetermined time. It is an object of the present invention to provide a gas emission preventer having a high level.

[0008]

According to one aspect of the present invention, there is provided a closing valve mechanism which is held in an open position through a holding spring in a body having a flow path and is shut off by gas pressure. A gas emission preventer comprising:
The closing valve mechanism includes a case held by the holding spring, an auxiliary rod with an auxiliary flow path attached to a front portion of the case, and a movable member housed in a guide member in the case. A ball valve for opening and closing the auxiliary flow path,
When the gas flow is in a temporary overflow state, the case moves to block the flow path and gas flows from the auxiliary flow path,
In a case where the overflow state continues, the auxiliary flow path is closed by the ball valve so that the auxiliary flow path is shut off.

Therefore, according to the first aspect of the present invention, when the gas flow becomes a temporary overflow state, the case moves to shut off the flow path, but the gas flows from the auxiliary flow path and the overflow state continues. In this case, the auxiliary flow path is closed by a ball valve to shut off the gas flow, so that the gas flow is not interrupted in an instantaneous overflow state and automatically returns when the overflow state disappears,
The gas supply is not interrupted.

According to a second aspect of the present invention, there is provided the gas release preventer according to the first aspect, wherein the guide member is formed of a coil-shaped elastic member.

Therefore, according to the second aspect of the present invention, the ball valve is guided by the coil-shaped elastic member, and the gas flow and the suppression of the movement of the ball valve are improved.

According to a third aspect of the present invention, there is provided the gas release preventer according to the first or second aspect, wherein the stop valve mechanism is pressed against the tip of the auxiliary rod in an opening direction from a shut-off position. And a closing valve return means for returning to the open position.

Therefore, according to the third aspect of the present invention, forcible return can be performed even when the closing valve return mechanism is stuck and is difficult to separate.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gas emission preventing device according to an embodiment of the present invention.

As shown in FIG. 1, a gas emission preventer 1 according to the present embodiment comprises a body 2 having flow paths 2a, 2b and 2c.
And a closing valve mechanism 3 provided in the body 2 and a closing valve returning rod 4 as closing valve returning means for returning the closing valve mechanism 3. The body 2 has a gas flow inlet on the flow path 2a side and a gas flow outlet on the flow path 2c side.

The holding spring 16 is provided between the holding spring 16 and the closing valve 18.
Is provided.

As the guide member 7, a coil-shaped elastic member, for example, a coil spring is used.
The ball valve 8 is movably accommodated inside the guide member 7. Closing valve return rod 4
Is attached to the body 2 so as to be able to move up and down, and has a tapered portion 17 formed at the tip to be in contact with the tip of the auxiliary rod 6.

Next, the operation of the gas release preventing device 1 will be described.

As shown in FIG. 1, normally, gas flows from the inlet side flow path 2a to the outlet side flow path 2c through the flow path 2b. At that time, a part of the gas enters the case 5 and flows out of the auxiliary flow path 13 to the flow path 2c. The case 5 is pushed forward by the gas pressure passing through the inside of the case 5, but the movement of the case 5 is prevented by the force of the holding spring 16.

However, when the gas flow rate suddenly exceeds a predetermined value, the case 5 moves forward against the holding spring 16 and the packing 15 is moved to the flange 18 of the body 2 as shown in FIG. Abut. At this time, since the gas flow passes through the auxiliary flow path 13 in the auxiliary rod 6, the gas flow does not stop.

When the gas overflow state is instantaneous and immediately returns to the normal flow, the case 5 returns to the state of FIG. 1 by the force of the holding spring 16. However, if the gas overflow state continues to some extent, the ball valve 8
Is pushed by the gas pressure, slides in the guide member 7 and
Abuts the rear surface of the Thereby, the auxiliary flow path 13 is closed,
As a result, all the flow paths are blocked, and the gas flow stops completely.

When the gas flow returns to normal, the case 5 automatically returns by the force of the holding spring 16.
In the case where the case sticks to the flange portion 18 and is difficult to separate, the case 5 can be forcibly returned by lowering the closing valve return rod 4 and pushing the auxiliary rod 6 with the tapered portion 17.
When the case 5 returns, the ball valve 8 is pushed and returns to the original position, thereby opening the auxiliary flow path 13.

In the above-described embodiment, it is preferable to use a coil-shaped elastic member, for example, a coil spring, as the guide member 7 because of good gas flow, but it is also possible to use a perforated cylinder.

As described above, when the gas flow is in a temporary overflow state, the case 5 moves to cut off the flow paths 2b and 2c, and the gas flows from the auxiliary flow path 13 and the overflow state continues. Since the auxiliary flow path 13 is closed by the ball valve 8 so as to be shut off, the gas flow is not interrupted in an instantaneous overflow state and automatically returns when the overflow state disappears.
The gas supply is not interrupted.

[0025]

As described above in detail, according to the first aspect of the present invention, when the gas flow is in a temporary overflow state, the case moves to shut off the flow path and the gas flows from the auxiliary flow path. When the overflow condition continues, the auxiliary flow path is closed by the ball valve to shut off the gas flow. Since the automatic return is performed, the gas supply is not interrupted, and no trouble is caused to the consumers.

According to the second aspect of the present invention, since the coil-shaped elastic member is used as the guide member, in addition to the effect of the first aspect of the present invention, gas flow and movement of the ball valve are suppressed. Is good.

According to the third aspect of the present invention, there is provided a closing valve returning means for pressing the closing valve mechanism in the opening direction from the shut-off position to return to the open position. In addition to the effect described above, the forced return can be performed even when the closing valve return mechanism is stuck and is difficult to separate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a gas emission preventer of the present invention.

FIG. 2 is a vertical sectional side view showing an operation of the gas release preventing device in an instantaneous overflow state.

FIG. 3 is a vertical sectional side view showing an operation of the gas release preventing device in a continuous overflow state.

FIG. 4 is a longitudinal sectional side view of a conventional gas emission preventing device,
(A) shows a normal state, and (b) shows an overflow state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas release preventing device 2 Body 2a, 2b, 2c Flow path 3 Closing valve mechanism 4 Closing valve return rod (closing valve return mechanism) 5 Case 6 Auxiliary rod 7 Guide member (coiled elastic member) 8 Ball valve 13 Auxiliary flow Road 16 Retaining spring

Continued on front page F-term (reference) 3E072 GA30 3H025 BA21 BB01 3H055 AA04 AA05 AA22 BA04 BA12 BB14 BC01 CC07 DD02 DD40 EE08 FF15 FF19 3H060 AA03 AA04 BB03 BB08 CC02 DA04 DA11 DB12 DB13 DC05 FF02 H07H GG07

Claims (3)

[Claims] 1. A gas release preventer provided with a closing valve mechanism which is held in an open position via a holding spring in a body having a flow path and shuts off by gas pressure, wherein said closing valve mechanism comprises Case, an auxiliary rod with an auxiliary flow path attached to the front of the case, and a movable member housed in a guide member provided in the case to open and close the auxiliary flow path. A ball valve, and when the gas flow is in a temporary overflow state, the case moves to shut off the flow path, gas flows from the auxiliary flow path, and when the overflow state continues, A gas emission preventer, wherein the auxiliary flow path is closed by a ball valve to be in a cutoff state. 2. The gas emission preventing device according to claim 1, wherein the guide member is formed of a coiled elastic member. 3. A closing valve returning means for contacting a tip of said auxiliary rod and pressing said closing valve mechanism in an opening direction from a shut-off position to return to an open position. An outgassing device as described.