JP2954528B2 - Pressure sensing safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a check valve which can be opened by pushing a nozzle valve when a gas container is mounted,
The present invention relates to a pressure sensing safety device for a gas appliance having a configuration in which a piston movable due to an abnormal increase in the internal pressure of a gas container is incorporated in a pressure sensing chamber via sealing means.

[0002]

2. Description of the Related Art There is a pressure sensing device using a piston which moves upon sensing an abnormal rise in the internal pressure of a gas container and shuts off the flow of gas, which is described, for example, in Japanese Utility Model Laid-Open No. 7-22248 as a piston member. As shown in the figure, a seal member such as an O-ring is attached to the outer periphery of the piston. This seal member keeps the space between the inner peripheral surface of the cylindrical pressure sensing chamber in which the piston is housed and the outer peripheral surface of the piston airtight.

[0003] However, when a gas appliance incorporating such a piston with a seal member is not used for a long period of time, a problem has been found that the seal member is stuck to the inner peripheral surface of the pressure sensing chamber. As a result, there is a danger that the sliding resistance of the piston increases and the operating pressure of the pressure sensing safety device becomes higher than a reference value.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and the problem is that when the seal means is not used for a long period of time , the sealing means adheres to the inner surface of the pressure sensing chamber.
It is an object of the present invention to ensure that the operating pressure does not increase even in the state, and that the safety device can always operate at an appropriate pressure.

[0005]

According to the present invention, a check valve in contact with a tip of a nozzle valve of a gas container and a piston incorporated in a pressure sensing chamber are integrally movably arranged. In addition, a spring means for pressing the piston in the contact direction with the check valve is provided, and when the gas container is mounted, the movement of the check valve pushed by the nozzle valve is transmitted to the piston, and the seal means is in contact with the inner surface of the pressure sensing chamber. Is slid with the piston to ensure that abnormal pressure is sensed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure sensing safety device according to the present invention has a check valve 11 which can be opened by pushing a nozzle valve N when a gas container B is mounted. It has a configuration in which a piston 12 movable by ascending is incorporated into a pressure sensing chamber 14 via first and second sealing means 16 and 13.

The pressure sensing chamber 14 is means for enabling the piston 12 to sense the pressure of the gas ejected from the gas container B. The upstream side of the region where the pressure of the ejected gas is dominant is the connection port of the nozzle valve N of the gas container B, and the downstream side is the tip side of the piston 12. A sealing means 15 is provided on the upstream side to maintain airtightness. First sealing means 1
Reference numeral 6 also serves as a downstream sealing means.

In the illustrated embodiment, the body 10 is provided with a hollow portion therethrough. The hollow portion is on the axis in the mounting direction of the nozzle valve N, one end opening 17 is a connection port, and the other end opening 18 is provided with a tip of a piston. Inside the one-end opening 17, the check valve 11 that is in opposition to the nozzle valve N inserted into the connection port is disposed.

The check valve 11 according to the present invention comprises a nozzle valve N
Is pressed against the built-in spring (not shown). That is, the check valve 11 moves by being pushed by the nozzle valve N at the initial stage of mounting, and when the check valve 11 comes into contact with the support 21, the check valve 11 is pushed back and opened.

In the illustrated embodiment, the check valve 11 is
1 is provided so as to be movable in the axial direction. The support body 21 is fixed to the main body 10 with its outer peripheral edge locked by a locking step 22 provided in the hollow portion. The tip of the check valve 11 projects forward from the passage 23 in the center of the support so as to be able to contact the piston 12. However, although the check valve 11 and the piston 12 need to be movable in the same direction, they need not be on the same axis.

Reference numeral 24 denotes a hole formed in the support 21 for introducing a gas flow. The gas flow is once received by the support 21 and flows into the pressure sensing chamber 14 through the introduction hole 24.

When the pressure of the gas introduced into the pressure sensing chamber 14 is within a normal value range, the piston 12 flows the gas downstream, and when the gas rises abnormally, the piston 12 moves by the pressure. Cut off the flow. That is, the piston 12 operates not only as a pressure-sensitive means but also as a gas flow opening / closing means.

The second sealing means 13 is provided for the opening / closing means. In the case of the illustrated embodiment, the piston 12 has a cylindrical portion disposed in the pressure sensing chamber 14, and a concave groove is formed in the outer peripheral surface on the upstream side (the check valve side), and the second sealing means is formed therein. 13 is fitted and fixed. Each sealing means may be an O-ring.

A sealing surface 25 is formed on the inner peripheral surface of the pressure sensing chamber 14 as a partner for blocking or passing the gas flow when the second sealing means 13 comes into contact with or separates therefrom.
In the illustrated embodiment, the sealing surface 25 is tapered so that the piston 12 can slightly move in the axial direction while contacting the inclined surface. Therefore, the second sealing means 13 moves in the taper direction to make the seal more stable.

A through hole 26 through which the gas flows from the pressure sensing chamber 14 to the downstream is provided downstream of the sealing surface 25 (second sealing means 13) and downstream of the pressure sensing chamber 14 (first seal). It is formed in a range upstream of the means 16). In the case of the illustrated embodiment, the main body 10 is integrated with a pressure reducer (also referred to as a governor), and the through-hole 26 is formed in the diaphragm 2.
7 and a pressure sensing chamber 14.

[0016] The piston 12 has a distal narrow shaft-like portion 29 than the cylindrical portion having a first sealing means 1 6,
The spring means 19 is acting here. The spring means 19 in the present invention can act on and push the nozzle valve N through the piston 12 and the check valve 11, but the internal pressure of the gas container B rises abnormally, and the pressure determined to be dangerous is reduced. If it exceeds, the piston 1 that moves by sensing the pressure
2 has an elastic pressure capable of elastic deformation.

The spring means 19 in the illustrated embodiment comprises a coil spring wound around the shaft portion 29, one end of which is supported by the body and the other end of which acts on the piston 12. Adjuster 3 capable of adjusting one end of spring means 19 to extend and contract in the axial direction
The device can be adjusted to operate within a set pressure range (e.g., 4-6 kg / cm < ² >) by supporting by zero and changing the spring length. The illustrated adjuster 30 is screwed into the other end opening 18.

The distal end of the shaft portion 29 can protrude from the distal end opening 18 of the hollow portion of the main body, and also serves as an operating portion for resetting and the like. That is, the engaging portion 31 is provided at the tip, and the engaging piece 3 which is in contact with the tip of the shaft portion by the spring 32 is provided.
3 is the piston 12 by the engaging portion 31 that has come to the projecting position.
The cam surface 3 contacting the shaft end face 34
5 allows resetting of the piston 12 to be pushed back in the valve opening direction. Reference numeral 36 denotes an operation piece having the engagement portion 31 and the cam surface 35.

In such a device according to the present invention, when the nozzle valve N of the gas container is inserted into the connection port, the nozzle valve N hits the check valve 11, and the piston 12 is pushed by the check valve 11 and moves by a certain amount. I do. At this time, the first sealing means 16 provided on the piston 12 also moves with respect to the inner surface of the pressure sensing chamber 14, so that the first sealing means 16 is immediately released even if it is in the fixed state.

With the connection of the normal gas container, the nozzle valve N
Opens and the gas gushes. 1 is in the lower half of FIG.
The check valve 11 moves forward until it comes into contact with its support 21, and the piston 12 also moves forward integrally, but the second sealing means 13 has not yet come into contact with the sealing surface 25. Therefore, the gas flows downstream from the through hole 26 and the gas appliance equipped with the decompressor can be used normally.

When the internal pressure of the gas container rises abnormally and exceeds the upper limit of the pressure value recognized as safe, the abnormally high pressure is sensed by the piston 12 and the piston 12 senses the abnormally high pressure in the axial direction. By the movement, the second sealing means 13 comes into close contact with the sealing surface 25 and shuts off the gas flow. This is the state from the upper half to the lower half of FIG.

The following results were obtained by comparing the change over time between the conventional pressure sensing safety device and the pressure sensing safety device according to the present invention.

Operating pressure at the time of production Operating pressure change after one month Conventional type 4.5 6.2 1.7 (up 38%) Present invention 5.1 5.3 0.2 (up 4%) The effect of the invention was confirmed.
The unit is Kg / cm ² .

[0024]

According to the present invention more as constructed and since it is intended to act, enter Rukoto in use from moving press必et not a piston by the mounting of the gas container, even if not used for a long time the gas appliance Therefore, the operating pressure does not become excessive, and the safety device can always be operated at an appropriate pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a pressure sensing safety device according to the present invention.

FIG. 2 is a sectional view showing the operation state of the next stage of FIG. 1;

FIG. 3 is a plan view of a pressure reducer incorporating the device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F17C 13/04 301 F17C 13/12 301 F23D 14/28 F23K 5/00 304

Claims (6)

(57) [Claims] 1. A check valve which can be opened by pushing a nozzle valve of a gas container when the gas container is mounted, and a piston movable by an abnormal rise in the internal pressure of the gas container is incorporated into the pressure sensing chamber via a sealing means. A pressure sensing safety device having a non-return valve, wherein a check valve in contact with a tip of a nozzle valve of a gas container and a piston incorporated in a pressure sensing chamber are integrally movably arranged, and the piston is connected to the check valve. A spring means for applying pressure in the direction of contact with the piston, transmitting the movement of the check valve pushed by the nozzle valve when the gas container is mounted to the piston, and sliding the seal means in contact with the inner surface of the pressure sensing chamber together with the piston. A pressure sensing safety device characterized in that: 2. The non-return valve and the piston are arranged so as to be movable on the same axis, and the piston is pushed back by spring means against a nozzle valve mounted from the non-return valve side. 2. The pressure sensing safety device according to claim 1. 3. A non-return valve which can be opened by pushing a nozzle valve when the gas container is mounted, and a piston movable by an abnormal rise in the internal pressure of the gas container is incorporated into the pressure sensing chamber via a sealing means. A pressure-sensitive safety device having a non-return structure, wherein the check valve is pushed by the nozzle valve when the gas container is mounted and moves until it comes into contact with the support, and the contact valve pushes the nozzle valve back to open. , The piston has first and second two sealing means located before and after the through-hole of the gas flowing out of the pressure sensing chamber, and spring means for applying pressure in the direction of contact with the check valve. The first sealing means is movable in contact with the inner surface of the pressure sensing chamber, and the second sealing means is capable of moving away from and in contact with the inner surface of the pressure sensing chamber. Control the
The check valve and the piston are located on the same axis, and when the gas container is mounted, the movement of the check valve is transmitted to the piston so that the first sealing means slides against the inner surface of the pressure sensing chamber. And pressure sensing safety device. 4. The gas sensor according to claim 1, wherein said sealing means is an O-ring, and is adapted to contact a tapered sealing surface forming an inner peripheral surface of said pressure sensing chamber to interrupt a gas flow. A pressure sensing safety device as described. 5. The pressure sensing safety device according to claim 1, wherein the spring means is a coil spring, and is configured to resiliently press the piston from outside the pressure sensing chamber. 6. The pressure sensing safety device according to claim 1, wherein the spring means is supported by an adjuster which can be extended and contracted in the axial direction, and the operating pressure of the piston is adjusted within a set pressure range.