JP2017025951A - Pressure sensible safety device and governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel pressure sensible safety device with an explosion prevention valve capable of preventing explosion of a small-sized gas container by exhausting a gas within the small-sized gas container without destroying the small-sized gas container even if a pressure of the gas within the small-sized gas container that is mounted in a gas appliance such as a gas cartridge stove rises by being heated with an external factor such as an external heat source.SOLUTION: The pressure sensible safety device comprises: a gas cutoff type safety mechanism which cuts off a flow of a gas from a small-sized gas container by sensing a working pressure in the case where an inner pressure of the mounted small-sized gas container rises equal to or higher than a predetermined working pressure; and an explosion prevention valve which releases the flow of the gas from the small-sized gas container to the outside by sensing an explosion prevention pressure in the case where the inner pressure of the small-sized gas container further rises from the working pressure and becomes equal to or higher than a predetermined explosion prevention pressure that is lower than a burst pressure of the small-sized gas container.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pressure sensing safety device and a governor, and more particularly to a pressure sensing safety device and a governor having an explosion-proof valve for preventing an explosion of a small gas container such as a small gas cylinder.

  In the case of gas appliances such as gas combustion equipment using small gas containers such as small gas cylinders, such as cassette stoves, sometimes unexpectedly used, for example, on electromagnetic cookers, cooking utensils that are too large, When using certain cooking utensils, such as asbestos or ceramic fish roasts, grilled nets, ceramic plate, for other purposes than cooking, for example, for burning charcoal, etc. There is a risk that the small gas container will explode, or the small gas container will be heated to an abnormally high temperature, and if it is severe, the small gas container will explode. In order to eliminate the risk of such a small gas container explosion, a pressure sensing safety device for stopping gas supply from the small gas container to the gas burner of the gas appliance is integrated with the governor and attached to the gas appliance, and / or Alternatively, one or more of the small gas containers are destroyed before the explosion, and a plurality of fragile portions that release the gas in the small gas container are provided in the small gas container itself. Such pressure sensing safety devices of gas appliances and / or fragile parts of small gas containers are standardized in various countries.

At present, as a pressure sensing safety device, when the pressure in a small gas container becomes a predetermined operating pressure, for example, in the Japanese standard (JIS S 2147), the pressure exceeds 0.4 MPa to 0.6 MPa. Like the pressure sensing safety device disclosed in Patent Document 1 of the applicant's application, a small gas is formed integrally with a governor that adjusts the gas supply (supply pressure and supply amount) to the gas burner of the gas appliance. Passage blocking type pressure sensing safety device that shuts off the gas path from the container to the gas burner of the gas appliance, and magnet type pressure sensing safety device that acts to remove the small gas container itself against the magnetism of the magnet Etc. are used.
Such a safety device, particularly the pressure sensing safety device according to the applicant's application, reliably stops the gas supply to the gas burner against a pressure increase in the small gas container due to abnormal combustion of the gas appliance itself. Therefore, the pressure increase in the small gas container can be stopped, and the pressure in the small gas container can be reduced to a safe pressure, so that the safety is extremely high.

JP 2002-221299 A

However, when the gas appliance equipped with the small gas container is heated by an external factor, for example, an external heat source, the pressure in the small gas container rises and the pressure sensing safety device provided in the gas appliance is activated. Even if the gas passage is cut off in the passage blocking method or the small gas container itself is removed from the pressure sensing safety device in the magnet method, the pressure in the small gas vessel rises unless an external heat source is removed. However, there was a fear and a problem that explosion pressure was reached and explosion occurred.
In particular, in recent years, the electromagnetic cooker has become widespread, and since the upper surface of the electromagnetic cooker is flat, while using the cassette stove on the upper surface, put the switch of the electromagnetic cooker, There was a problem and fear that a small gas container was heated and an explosion accident occurred. In addition, when two cassette stoves are used side by side, the small gas container of the other stove is heated by the heat of the one stove, causing an explosion accident, or by the heat from the heat storage cooking utensils, etc. There was a problem and fear that the gas container was heated and an explosion accident occurred.

  For this reason, even if the gas appliance is equipped with a pressure sensing safety device, especially in the case of a magnet type pressure sensing safety device, if the pressure in the small gas container rises above the operating pressure, the small gas container itself Explosions are inevitable unless a small gas container is provided with a plurality of weak parts and the internal gas is released by destroying one or more weak parts. There was a problem or fear.

  The object of the present invention is to solve the above-mentioned problems of the prior art, even if the gas pressure in the small gas container is heated by an external factor such as an external heat source and attached to a gas appliance such as a cassette cooker. Even in the case of rising, the gas inside the small gas container can be discharged without destroying the small gas container, and the explosion of the small gas container can be prevented. When the gas pressure rises to a predetermined pressure below the burst pressure of the small gas container due to heating due to external factors, the gas inside the small gas container is released to prevent the small gas container from exploding, The present invention provides a novel pressure sensing safety device with an explosion-proof valve and a governor that can stop the release of gas inside a small gas container when the pressure falls below the above-mentioned predetermined pressure.

In order to achieve the above object, the pressure sensing safety device according to the present invention senses the operating pressure from the small gas container when the internal pressure of the mounted small gas container abnormally rises above a predetermined operating pressure. A gas shut-off safety mechanism that shuts off the gas flow and senses explosion-proof pressure when the internal pressure of the small gas container rises further abnormally from the operating pressure and exceeds the specified explosion-proof pressure that is less than the burst pressure of the small gas container. And an explosion-proof valve that opens the gas flow from the small gas container to the outside.
In order to achieve the above object, a governor according to the present invention includes the pressure sensing safety device.
Here, it is preferable that the gas shut-off safety mechanism shuts off the gas passage from the small gas container, and the explosion-proof valve detects the explosion-proof pressure and opens the gas passage to the outside.
The operating pressure is a predetermined pressure within a range of 0.4 MPa to 0.6 MPa, and the explosion-proof pressure is a predetermined pressure within a range of more than 0.6 MPa and less than the bursting pressure of a small gas container. preferable.
The explosion-proof pressure is preferably a predetermined pressure within a range of 1.3 MPa or more and less than 1.5 MPa.

The explosion-proof valve is disposed along the circumferential direction so as to be interposed between the valve chamber communicating with the gas passage, the valve body slidably accommodated in the valve chamber, and the valve chamber and the valve body. A relief valve having a seal member disposed, a push spring disposed in the valve chamber and biasing the valve body in one direction, and a gas discharge passage communicating the valve chamber with the outside. If the pressure applied to the pressure sensing surface of the valve body of the pressure sensing chamber is equal to or higher than the explosion-proof pressure, the pressure sensing chamber is composed of the region of the valve chamber on the side communicating with the gas passage divided by the pressure sensing surface. When the pressure sensing chamber communicates with the gas discharge passage and the pressure applied to the pressure receiving surface of the valve body of the pressure sensing chamber is less than the explosion-proof pressure, the pressure sensing chamber and the gas discharge passage are preferably shut off.
The seal member is attached to the valve body along the circumferential direction, and the push spring biases the valve body in a direction in which the seal member is in close contact with the inner wall surface of the valve chamber, and the seal member is in close contact with the inner surface of the valve chamber. The wall surface is closer to the gas passage than the gas discharge passage, the seal member is brought into close contact with the inner wall surface of the valve chamber, the pressure sensing chamber and the gas discharge passage are shut off, and the seal member is placed inside the valve chamber. The pressure sensing chamber and the gas discharge passage are preferably communicated with each other at a distance from the wall surface.

The seal member is attached to the valve body along the circumferential direction, the push spring urges the valve body toward the gas passage, and the valve body causes the seal member to be in close contact with the inner wall surface of the valve chamber. In this state, the valve chamber slides, the seal member is brought into close contact with the inner wall surface of the valve chamber closer to the gas passage than the gas discharge passage, the pressure sensing chamber and the gas discharge passage are shut off, and the seal member is removed from the gas discharge passage. It is preferable that the pressure sensing chamber communicates with the gas discharge passage in close contact with the inner wall surface of the valve chamber farther from the gas passage.
The seal member is arranged along the circumferential direction on the ceiling of the valve chamber, the push spring biases the valve body toward the gas passage, and the valve body has an annular protrusion, The valve chamber slides so as to be in close contact with or away from the seal member, the protrusion of the valve body is brought into close contact with the seal member, the pressure sensing chamber and the gas discharge passage are shut off, and the protrusion of the valve body is separated from the seal member. The pressure sensing chamber and the gas discharge passage are preferably communicated with each other at a distance.

According to the present invention, even if the gas pressure in a small gas container mounted on a gas appliance such as a cassette cooker is heated by an external factor such as an external heat source, the small gas is increased. Without destroying the container, the gas inside the small gas container can be released to prevent the small gas container from exploding.
Further, according to the present invention, in addition to the above effect, when the gas pressure in the small gas container rises to a predetermined pressure lower than the burst pressure of the small gas container due to heating due to an external factor, the small gas container The gas inside the container is released to prevent the small gas container from exploding. When the pressure falls below the above-mentioned predetermined pressure, the gas emission inside the small gas container can be stopped.

It is a top view which shows the whole structure of one Example of the cassette stove provided with the governor which has the pressure sensing safety device which concerns on one Embodiment of this invention, and the small gas container with which a governor is mounted | worn. It is a top view which shows the state before the small gas cylinder accommodated in the cylinder accommodating part of the cassette stove shown in FIG. 1 is set to a governor. It is a top view which shows the state with which the small gas cylinder accommodated in the cylinder accommodating part of the cassette stove shown in FIG. 1 was mounted | worn with the governor. It is sectional drawing which shows the structure of one Example of the governor with which the pressure sensing safety device which concerns on this invention shown in FIG. 1 was integrated. It is sectional drawing which shows the mounting state of the small gas cylinder to the pressure sensing safety device of the governor shown in FIG. It is sectional drawing which shows the action | operation (gas passage interruption | blocking) state of the pressure sensing safety device of the governor shown in FIG. It is sectional drawing which shows the action | operation (relief valve open) state of the pressure sensing safety device of the governor shown in FIG. (A) is sectional drawing of one Example of the relief valve used for the pressure sensing safety device of the governor shown in FIG. 4, (B) and (C) are each used for the pressure sensing safety device of this invention. It is sectional drawing of the other Example of the relief valve used. (A), (C), and (E) are sectional views showing different operating states of other embodiments of the relief valve used in the pressure sensing safety device of the present invention, respectively (B), (E) , And (F) are bottom views of the relief valve in the activated state shown in (A), (C), and (E), respectively. (A), (B), and (C) are sectional views showing different operating states of another embodiment of the relief valve used in the pressure sensing safety device of the present invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, a pressure sensing safety device according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
FIG. 1 is a plan view showing an overall configuration of an embodiment of a small-sized gas container mounted on a cassette stove including a governor according to the present invention having a pressure sensing safety device according to an embodiment of the present invention and a governor. 2 and 3 are plan views showing a state in which the small gas cylinder stored in the cylinder storage portion of the cassette stove shown in FIG. 1 is not attached to the governor and is attached to the governor. FIG. 4 is a cross-sectional view showing a configuration of an embodiment of a governor according to the present invention in which the pressure sensing safety device according to the present invention shown in FIG. 1 is integrated.

A cassette stove 10 shown in FIG. 1 includes a burner housing portion 12 and a cylinder housing portion 14 of the stove body.
The burner accommodating portion 12 includes a casing 12a of a stove main body and a top plate 12b placed on the casing 12a, and is located on the burner 16 and the burner 16 accommodated in the casing 12a. The top plate 12b is placed on the top plate 18 and the cooking utensil 18 is placed on the top plate 12b.
The cylinder storage unit 14 includes a casing 14a and a lid (not shown) that covers the casing 14a, and is provided in the casing 14a and includes a governor 20 including the pressure sensing safety device according to the present invention and a lever type. The cylinder attaching / detaching device 22 is connected to the governor 20 and has an instrument knob 23 for controlling the ignition and extinguishing of the cassette stove 10.

Prior to explaining the governor 20 having the pressure sensing safety device of the present invention, a small gas container (hereinafter referred to as a gas cylinder) 24 is attached to the governor 20 of the cylinder storage unit 14 and the casing 14a of the cylinder storage unit 14 is installed. The lever type cylinder attaching / detaching device 22 for storing in the container will be described.
One end of the cylinder attaching / detaching device 22 protrudes to the front side of the cylinder accommodating portion 14, and an attaching / detaching lever 26 for attaching / detaching the gas cylinder 24 by pushing down and pulling up, and one end thereof are connected to the other end of the attaching / detaching lever 26. A known link mechanism 28 provided along the side surface of the cylinder storage unit 14, in the illustrated example, along the boundary surface with the burner storage unit 12, and one end thereof is connected to the other end of the link mechanism 28, and the side surface of the cylinder storage unit 14 A sliding plate 30 that slides along the side of the cylinder housing portion 14, a detachable device main body 32 that slidably supports the sliding plate 30, and the other end of the sliding plate 30. And a support claw 34 that is provided so as to be orthogonal to the bottom peripheral edge 24 b of the gas cylinder 24. The cylinder attaching / detaching device 22 is further supported on one end side (link mechanism 28 side) of the attaching / detaching device main body 32 so as to be slidable with respect to the attaching / detaching device main body 32, and is engaged with the upper peripheral edge 24 a of the gas cylinder 24. It has a claw 36, a support claw 36, a spring 38 stretched at a predetermined location on the attachment / detachment device main body 32, and a coil spring 38 in the illustrated example.

In the cylinder attaching / detaching device 22, when the attaching / detaching lever 26 shown in FIG. 2 is in the “detached” position, for example, the pulled up position, the support claw 34 and the support claw 36 are the upper peripheral edge 24 a and the bottom peripheral edge 24 b of the gas cylinder 24. Since they are separated by a distance longer than the distance between them, the gas cylinder 24 can be disposed therebetween.
Next, in the cylinder attaching / detaching device 22, as shown in FIG. 3, when the attaching / detaching lever 26 is pushed down to the “wearing” position, the sliding plate 30 is moved forward (one end side) by the action of the link mechanism 28. The support claw 34 engages with the bottom peripheral edge 24b of the gas cylinder 24 and moves forward, whereby the gas cylinder 24 can be pulled forward, and the nozzle portion 24c of the gas cylinder 24 is inserted into an insertion port of a governor 20 described later. It can be pushed into the insertion port 74 a of the member 74. Thus, the cylinder attaching / detaching device 22 can attach the gas cylinder 24 to the governor 20.

At this time, when the gas cylinder 24 is pulled forward, the support claw 36 is engaged with the upper peripheral edge 24a of the gas cylinder 24, and when it is pulled forward, the spring 38 is extended, and the upper peripheral edge 24a and the bottom peripheral edge 24b of the gas cylinder 24 are extended. Are securely supported and fixed between the support claws 36 and 36 by the elastic force of the spring 38.
On the contrary, when the gas cylinder 24 is mounted on the governor 20, when the detachable lever 26 is pulled up to the “disengaged” position, the sliding plate 30 is moved to the back side (the other end) by the action of the link mechanism 28. The gas cylinder 24 can be pushed backward (the other end side) by pushing the upper peripheral edge 24a of the gas cylinder 24 with which the support claw 36 is engaged to the back side, and the nozzle of the gas cylinder 24 The portion 24c can be pulled out from the insertion opening 74a of the governor 20. Thus, the cylinder attaching / detaching device 22 can remove the gas cylinder 24 from the governor 20. At this time, the support claw 34 is separated from the engagement position with the bottom peripheral edge 24 b of the gas cylinder 24.

The cylinder attachment / detachment device 22 can attach / detach the gas cylinder 24 to / from the governor 20 as described above.
Note that the cylinder attaching / detaching device used in the present invention is not limited to the lever-type cylinder attaching / detaching device 22 in the illustrated example, and is not particularly limited as long as a passage blocking type pressure sensing safety device is applicable. A known cylinder attaching / detaching device can be used. For example, the lever type cylinder attaching / detaching device disclosed in Japanese Patent No. 5538339 related to the present applicant may be used, or a magnet type cylinder attaching / detaching device or the like may be used.

  As shown in FIG. 4, the governor 20 used in the cassette stove 10 shown in FIG. 1 is loaded into the cylinder accommodating portion 14 of the cassette stove 10, and the gas in the gas cylinder 24 connected to the governor 20 is transferred to the burner accommodating portion 12. In order to supply the burner 16, a combustible gas having a normal pressure (primary pressure) flowing out from the gas cylinder 24, for example, a gauge pressure of about 0.2 MPa, and a normal supply pressure (secondary pressure), for example, a gauge pressure of about The pressure reducer 40 for reducing the pressure to 2.74 kPa to 9.80 kPa and the gas pressure (internal pressure) of the gas cylinder 24 rises above a normal pressure, for example, 0.2 MPa, and reaches a predetermined operating pressure, for example, a JIS standard (JIS Gas from the gas cylinder 24 when the operating pressure is sensed when the pressure rises above the predetermined operating pressure of 0.4 MPa to 0.6 MPa determined in S 2147) For example, the gas shutoff safety mechanism 42 that shuts off the gas passage 62 to the decompressor 40 in the illustrated example, and the internal pressure of the gas cylinder 24 further rises from the operating pressure, so that the burst pressure of the gas cylinder 24, for example, made of JIS G 3303 tin steel plate The gas flow from the gas cylinder 24 is detected by detecting the explosion-proof pressure when the gas cylinder 24 is less than 1.5 MPa, that is, more than a predetermined explosion-proof pressure of more than 0.6 MPa and less than 1.5 MPa. And a relief valve 44 that opens the passage 64 to the outside. The burst pressure of the gas cylinder 24 is determined by the thickness of the steel plate used for the container body of the gas cylinder 24, for example, the plate thickness of the JIS G3303 tin plate, and the steel plate used for the caulking portions of the upper peripheral edge 24a and the bottom peripheral edge 24b, for example, the caulking of the tin-free steel sheet. More managed with strength. Therefore, the explosion-proof pressure is preferably less than the burst pressure determined by the gas cylinder 24.

Here, the decompressor 40, the gas shut-off safety mechanism 42, and the relief valve 44 are integrally provided in the apparatus main body 46 of the governor 40.
The gas shut-off safety mechanism 42 and the relief valve 44 constitute a pressure sensing safety device 48 of the present invention.
The governor 20 shown in FIG. 4 shows a state before the gas cylinder 24 is set, that is, attached, as shown in FIG.

The decompressor 40 is formed integrally with the gas shut-off safety mechanism 42 and is a pressure regulator that properly regulates the pressure of the gas supplied to the burner 16 by reducing the pressure of the gas, and is a decompression chamber formed in the apparatus main body 46. 50, a convex cap 52 provided at the top of the decompression chamber 50, and the decompression chamber 50 and the cap 52 so as to cover the top of the decompression chamber 50 in an airtight manner. A diaphragm 54 that expands and contracts accordingly, a spring 56 that is interposed between the convex portion of the cap 52 and the central portion of the diaphragm 54, and is provided in the center of the diaphragm 54 so as to protrude into the decompression chamber 50. Is formed in the apparatus main body 46, and an opening end (not shown) on one end side thereof is opened in the decompression chamber 50, and the other end side communicates with the burner 16. Flow An orifice (not shown) constituting a passage (not shown), and an opening / closing member (not shown) connected to the connector 58 and opening and closing the opening end of the orifice in accordance with the vertical movement of the connector 58 Have.
When the detachable lever 26 shown in FIG. 3 is in the depressed “wearing” position, gas passes through the pressure sensing chamber 78 and the gas passage 62 from the nozzle 24a of the attached gas cylinder 24 as shown in FIG. Flows into the decompression chamber 40 and fills the decompression chamber 40.

  The gas shut-off safety mechanism 42 is a first-stage pressure sensing safety means, which is formed in the apparatus main body 46, respectively, and a gas passage 62 communicating with the decompression chamber 50 in the middle of the through hole 60, The gas passage 64 communicating with the relief valve 44 in the middle of the through hole 60 and the through hole 60 from the front end (the end on the side where the gas cylinder 24 is mounted (hereinafter referred to as the front)) to the rear end (front end) And a stem 66 composed of a large-diameter portion 66a on the front side and a small-diameter portion 66b on the rear side, and an intermediate portion of the stem 66 in the circumferential direction. Sealing members 68a and 68b attached to the front receiving groove 66c and the rear receiving groove 66d, respectively, and the through hole 60 and the stem 66 on the rear side of the receiving groove 66c of the stem 66. A push spring 72 accommodated in the spring accommodating portion 70, an insertion port 74 a into which the nozzle portion 24 c of the gas cylinder 24 is inserted, an insertion port member 74 attached to the front side of the through hole 60, and a rear end of the through hole 60 And an engagement member 76 that is provided outside and engages with the engagement recess 66e when the engagement recess 66e provided on the rear side of the stem 66 protrudes outward from the rear end of the through hole 60.

The gas cutoff safety mechanism 42 further includes a pressure sensing chamber 78 formed between the through hole 60 and the stem 66 and extending from the insertion port 74a of the insertion port member 74 to the seal member 68b. The pressure sensing chamber 78 communicates with the gas passage 62 leading to the decompression chamber 50 and the gas passage 64 leading to the relief valve 44, and controls the operation of the stem 66. As a result, the gas shut-off safety mechanism 42 is controlled. Control.
The gas shut-off safety mechanism 42 has a stem 88 in which a check valve and a piston of the shut-off valve are integrated, and the stem 66 senses the abnormal pressure of the small gas cylinder 24, and as shown in FIG. The gas passage 62 is blocked by retreating. That is, the gas shut-off safety mechanism 42 has a stem 66 that can be pushed by the nozzle portion 24c when the gas cylinder 24 is mounted and can retreat through the through hole 60 of the apparatus main body 46, and the internal pressure of the gas cylinder 24 is the operating pressure. When the pressure rises abnormally, the operating pressure is sensed, and the stem 66 moves backward so that the gas flow reaching the decompression chamber 50 of the decompressor 40, that is, the gas passage 62 can be shut off.

  The through hole 60 includes a front large-diameter hole 60a, a rear small-diameter hole 60b having an inner diameter smaller than the inner diameter of the large-diameter hole 60a, and an inner diameter of the large-diameter hole 60a. It has an inner diameter larger than the inner diameter, and is composed of an intermediate medium diameter hole 60c between the large diameter hole 60a and the small diameter hole 60b. An insertion hole member 74 is fitted and fixed in the large-diameter hole portion 60a on the front side of the through hole 60 in an airtight manner. The medium-diameter hole portion 60c of the through-hole 60 is a portion in which the large-diameter portion 66a of the stem 66 is slidably inserted and constitutes a pressure sensing chamber 78 between the stems 66, and the inner wall surface is inclined. The inner wall surface of the inclined portion 61a is larger than the outer diameter of the seal member 68a of the large-diameter portion 66a of the stem 66. The circumference does not contact the inner wall surface, the inner diameter of the rear end of the inner wall surface of the inclined portion 61a is smaller than the outer diameter of the seal member 68a, and the entire circumference can reliably contact the inner wall surface and keep airtight. It can be done. The small diameter portion 66b of the stem 66 is slidably inserted into the small diameter hole portion 60b of the through hole 60, and the cylindrical space between the small diameter hole portion 60b and the small diameter portion 66b accommodates the push spring 72. The stem 66 is urged forward by a push spring 72.

  The gas passage 62 is not blocked by the seal member 68a of the receiving groove 66c and the seal member 68b of the receiving groove 66d even if the stem 66 moves in the small diameter hole portion 60b of the through hole 60. It is formed in the region and on the decompression chamber 50 side, the upper side in the figure. On the other hand, the gas passage 64 is not inclined by the seal member 68a of the receiving groove 66c when the stem 66 is in the retracted position in the medium diameter hole 60c of the through hole 60. It is formed in an intermediate region between the portion 61a and the parallel portion 61, on the opposite side to the burner 16, on the lower side in the figure. As will be described later, the gas passage 64 communicates with the outside when the relief valve 44 is opened and discharges the gas to the outside. Therefore, the gas passage 64 is diffused before reaching the burner 16, so This is so as not to be ignited by the heat of the cooking utensil placed on.

  The stem 66 is a shaft-like member that is slidable or slidable in the through hole 60 in the axial direction, and extends from one end (front end) to the other end (rear end) of the through hole 60. The stem 66 has a front end 66 f that is pushed by the nozzle portion 24 c of the gas cylinder 24 at the front half portion thereof. A large-diameter portion 66a is provided near the front end 66f, and a seal member 68a such as an O-ring is attached to a receiving groove 66c formed on the outer periphery of the rear end of the large-diameter portion 66a.

A portion on the rear half side of the stem 66 is a small diameter portion 66 b having an outer diameter slightly smaller than the inner diameter of the through hole 60, and is disposed so as to be slidable in the through hole 60.
Further, a seal member 68b such as an O-ring is attached to the receiving groove 66d formed on the outer periphery of the middle portion of the small diameter portion 66b from the large diameter portion 66a of the stem 66. In this way, the sealing member 68b attached to the small diameter portion 66b slides while contacting the inner wall surface of the through hole 60, so that the airtightness of the pressure sensing chamber 78 is maintained. As a result, the stem 66 can be retracted by the gas pressure applied to the front end portion of the stem 66.

As described above, the stem 66 is pushed forward by the push spring 72 provided in the spring accommodating portion 70 in the rear half portion. That is, the inner seal member 68b is attached to a circumferential receiving groove 66d provided in the intermediate portion of the stem 66, and the stem 66 is urged forward by the push spring 72 from the rear of the outer wall. In this structure, the pressure sensing chamber 78 side of the outer wall of the receiving groove 66d is also a pressure receiving part, so that the abnormal pressure of the small gas cylinder 24 is easily detected.
The push spring 72 is weaker than the spring built in the nozzle portion 24c of the gas cylinder 24, and after the abnormal increase in internal pressure, the gas cylinder 24 is removed, and the restraint of the stem 66 is released. Has the strength to return to.

  As described above, the pressure sensing chamber 78 is in an intermediate portion of the through hole 60 provided in the apparatus main body 46. The pressure sensing chamber 78 includes a slanted portion 61a having a sloping surface tapered inward and a parallel portion 61b having an inner diameter equal to the smallest inner diameter following the rear end of the slanted portion 61a. The inner seat portion 61c is set on the inner wall surface of the tapered inclined surface of the inclined portion 61a and the parallel portion 61b. When the stem 66 is retracted, the inner seat portion 61c comes into contact with the seal member 68a of the large diameter portion 66a and acts as a shut-off valve. On the other hand, the outer seat portion 61 d is provided at the front end of the inclined portion 61 a of the medium diameter hole portion 60 c of the through hole 60 in front of the pressure sensing chamber 78. Specifically, it is provided on the inner surface of the rear end side of the covering member 80 that covers the rear end side of the insertion port member 74 fitted in the large-diameter hole portion 60 a of the through hole 60. When the stem 66 is urged by the push spring 72 and the stem 66 is in the original position shown in FIG. 4 where the gas cylinder 24 is not mounted, the large-diameter portion 66 has the seal member 68a. It acts as a check valve.

The cover member 80 has a hole 80a through which the front end 66f of the stem 66 can enter and exit at the center thereof, and the nozzle portion 24c abuts the front end 66f when the gas cylinder 24 is mounted, so that the front end 66f and therefore the stem 66 Is pushed against the urging force of the push spring 72. The covering member 80 used in this example is a press-formed metal part, and is configured to be held inside the insertion port member 74. The covering member 80 can be replaced by a resin molded product.
The above-described outer seat portion 61 d defines the original position of the stem 66. The original position of the stem 66 is a position when the stem 66 is urged forward by the push spring 72, and the small gas cylinder 24 is attached to the pressure sensing safety device 48 (gas shut-off safety mechanism 42). This is a reference for the position of the stem 66 before being moved, and at this position, the front end 66f of the stem 66 protrudes outward and forward from the hole 80a.

  As described above, the stem 66 has the engaging recess 66e at its rearmost end. The engaging recess 66e is configured to restrain the axial movement of the stem 66 when the restraining member 82 is engaged therewith. Although the restraining member 82 is not illustrated, for example, it is assumed that the restraining member 82 is spring-biased in the engaging direction, and the stem 66 can be released from restraining and reset by releasing the engagement against the spring. As a method of operating the restraining member 82, any method such as a method of directly operating, a method of operating the instrument knob 23 that controls ignition and extinguishing of the cassette cooker 10, and the like can be used.

In the illustrated example, a spring accommodating portion 70 is provided between the small diameter hole portion 60 b of the through hole 60 on the rear half side and the rear half side of the small diameter portion 66 b of the stem 66, and the push spring 72 is accommodated. 66 is urged forward, but the present invention is not limited to this, and between the middle diameter hole portion 60 c of the through hole 60 and the front half side of the small diameter portion 66 b of the stem 66, that is, in the pressure sensing chamber 78. A spring accommodating portion may be provided to accommodate the pressing spring, and the stem 66 may be biased forward by the pressing spring.
In the illustrated example, the cover member 80 and the insertion port member 74 are separate members, but the present invention is not limited to this, and both members may be integrated to form a single integrated port member. At this time, the outer seat portion is formed in the integrated mouth member. Accordingly, there is an advantage that the number of parts can be reduced and the number of assembling steps can be reduced while having the same basic functions as the illustrated example. In particular, the integrated port member and the stem 66 have a shape structure that can be manufactured by die casting, and the apparatus main body 46 is originally die cast. Accordingly, since all three main parts can be manufactured by molding using a metal or resin as a material, the assembly of the gas shut-off safety mechanism 42 and the governor 20 can be performed extremely easily. Needless to say, the integration of the covering member 80 and the insertion port member 74 can be applied in various embodiments.

Furthermore, in the illustrated example, the restraint of the stem 66 is performed by the restraining member 82 that is spring-biased, but the present invention is not limited to this, and the restraint of the stem 66 acts in the counter-winding direction with respect to the moving direction. It may be done directly by a torsion spring.
Further, in the gas cutoff safety mechanism 42 in the illustrated example, a check valve urged forward by a spring from the stem 66 may be further provided in front of the stem 66. As a result, the shutoff valve by the gas shutoff safety mechanism 42 is operated, and when the small gas cylinder 24 is removed, it is possible to completely prevent an accident such as the combustion gas in the pressure sensing chamber 78 flowing backward and igniting. In this case, since a pressure difference occurs between the inside and outside of the outer seat portion 61d, the stem 66 cannot be returned to the original position simply by releasing the restraining member 82. However, after extinguishing the fire, the normal pressure gas cylinder 24 was set. Thereafter, the restraining member 82 may be released.

The relief valve 44 is a second-stage pressure sensing safety means, as shown in FIG. 4 and an enlarged view of FIG. 8A, formed in the apparatus main body 46, and a valve chamber 84 communicating with the gas passage 64. The valve body 86 is housed in the valve chamber 84 so as to be slidable in the vertical direction in the figure, the seal member 88 is attached to a receiving groove 86a provided in the valve body 86 along the circumferential direction, and the valve body 84 is disposed in the valve chamber 84. The seal member 88 is formed in the device main body 46 in the direction in which the seal member 88 is in close contact with the inner wall surface of the valve chamber 64, that is, in the upward direction in the figure, and the valve chamber 84 is connected to the outside of the device. And a gas discharge passage 92 communicating therewith.
The valve chamber 84 is on the upper side in the drawing, communicates with the pressure sensing chamber 78 by the gas passage 64, and has a small diameter hole portion 84 a having a constant inner diameter, and on the lower side in the drawing, and accommodates the pressing spring 90. Between the large-diameter hole portion 84b having an inner diameter larger than the inner diameter of the portion 84a and the small-diameter hole portion 84a and the large-diameter hole portion 84b, and the inner diameter changes from the inner diameter of the small-diameter hole portion 84a to the inner diameter of the large-diameter hole portion 84b. And an inclined hole portion 84c having an inclined inner wall surface. A gas discharge passage 92 communicates with the inclined hole portion 84 c of the valve chamber 84.

The inclined inner wall surface of the inclined hole portion 84c constitutes a valve seat 84d to which a seal member 88 attached to the valve body 86 is closely attached or separated. The seal member 88 attached to the valve body 86 closes or opens the relief valve 44 by closely contacting or separating from the valve seat 84d.
The lower end wall of the valve chamber 84 is formed by connecting and fixing a cylindrical protrusion 83a of the apparatus main body 46 forming the valve chamber 84 and a cylindrical member 83b closed at one end side by screwing. The The protrusion 83a and the member 83b are fixed by screwing. The male screw portion 85a formed on the cylindrical outer periphery of the protrusion 83a is formed in the cylindrical recess of the member 83b on the lower side of the gas discharge passage 92 in the figure. This can be done by screwing into the female thread portion 85b.
In the relief valve 44, the gas passage 64 communicating with the pressure sensing chamber 78 and the upper region in the figure of the valve chamber 84 defined by the valve body 86 also function as the pressure sensing chamber 94 that controls the operation of the relief valve 44. To do.
The valve body 86 is formed between a top portion 86b that moves in the small-diameter hole portion 84a, an inclined portion 86c in which a receiving seat 86a to which the seal member 88 is attached is provided, and a member 83b that is a lower end wall of the valve chamber 4. And a body portion 86d that sandwiches the pressing spring 90 therebetween.

The operation of the governor according to the present invention will be described.
In the governor 20 shown in FIG. 4, as shown in FIG. 2, the stem 66 is attached to the front by the urging force of the push spring 70 when the detachable lever 26 is in the “detached” position and the gas cylinder 24 is not attached. The large-diameter portion 66 a of the stem 66 abuts on the cover member 80 that covers the insertion port member 74, and the front end 66 f of the stem 66 is inserted into the hole 80 a of the cover member 80.
In the state before use (before the gas cylinder 24 is mounted) shown in FIG. 4, the pressures on the outer side and the inner side of the seal member 68a are substantially balanced.
In the state shown in FIG. 4, the relief valve 44 is in a closed state, and the seal member 88 attached to the valve body 86 is tightly adhered to the valve seat 84 d of the valve chamber 84 by the urging force of the push spring 90. doing.

Next, as shown in FIG. 3, the attachment / detachment lever 26 is pushed down to the “wearing” position, and as shown in FIG. 5, the nozzle portion 24 c of the gas cylinder 24 is inserted into the insertion port 74 a, and the gas cylinder 24 Is set, that is, in a mounted state, the front end 66f of the stem 66 is pushed in at the tip of the nozzle, so that the seal member 68a is separated inward from the outer seat portion 61d. Even in the state shown in FIG. 5, the relief valve 44 remains closed.
On the other hand, also in the small gas cylinder 24, the nozzle portion 24c is pushed in by the covering member 80 and opened. As a result, the gas ejected from the nozzle 24a of the gas cylinder 24 passes through the concave portion of the tip 66f of the stem 66 which is pushed back by the nozzle 24a and enters the cover member 80, that is, the cover member 80 and the large diameter portion 66a of the stem 66. Between the outer seat 61 d and the inner seat 61 c in the pressure sensing chamber 78 and the gap between the stem 66 and the gas passage 62 to the decompression chamber 50. As a result, the decompression chamber 40 is filled with gas.
Next, when the appliance knob 23 is opened to the ignition position, the gas whose pressure has been adjusted to the normal pressure by the diaphragm 54 in the decompression chamber 40 is sent to the burner 16 and ignited in the burner 16 by an ignition device (not shown). Thereafter, when the appliance knob 23 is set to the fire extinguishing position, the gas is not sent from the decompression chamber 40 to the burner 16 and the fire is extinguished.

  By the way, while the burner 16 is ignited, the internal pressure of the gas cylinder 24 rises abnormally, and reaches or reaches the operating pressure that is the predetermined set pressure within the range of 0.4 MPa to 0.6 MPa described above. When the pressure is exceeded, in the pressure sensing chamber 78 of the gas shut-off safety mechanism 42, the stem 66 receives the force positioned at the front end portion of the large-diameter portion 66a of the stem 66 serving as the pressure receiving portion and the rear end portion of the gas passage 62. It is received by the wall portion of the groove 66d. When the force overcomes the push spring 72, as shown in FIG. 6, the push spring 72 is compressed, the stem 66 is retracted, and the seal member 68a, for example, the O-ring contacts the inner seat portion 61c. Thus, the pressure sensing chamber 78 is shut off from the governor 20 side. At the same time, the restraining member 82 engages with the stem engaging recess 66e, so that the above-described blocking state is maintained, gas is not sent to the burner 16, and combustion stops. In the state shown in FIG. 6, the relief valve 44 remains closed.

In this operation, the large-diameter portion 66a of the stem 66 receives the internal pressure of the gas cylinder 24 to make the blocking more reliable. In this state, the seal member 68a of the stem 66 leaves the outer seat portion 61d.
Therefore, if the gas cylinder 24 is removed abnormally, the pressure on the upstream side of the seal member 68a becomes the atmospheric pressure, and the pressure on the downstream side also becomes the atmospheric pressure due to the residual gas discharge and balances. Therefore, when the restraining member 82 is released, the stem 66 is returned to the original position by the push spring 72, and the use can be continued by mounting the normal gas cylinder 24.

As described above, even if the internal pressure of the gas cylinder 24 rises abnormally due to abnormal combustion of the burner 16 of the cassette stove 10 due to the operation of the gas cutoff safety mechanism 42 of the governor 20, as shown in FIG. Since the supply of gas to the burner 16 can be shut off and the combustion of the burner 16 can be stopped, the internal pressure of the gas cylinder 24 can be reduced and returned to normal pressure.
However, when the internal pressure of the gas cylinder 24 is abnormally increased by an external heat source other than the combustion heat of the burner 16 of the cassette cooker 10, the gas shut-off safety mechanism 42, which is the first-stage pressure sensing safety means of the governor 20, is provided. Even if the gas cylinder 24 is operated and the gas supply from the gas cylinder 24 to the burner 16 is shut off, the internal pressure of the gas cylinder 24 cannot be reduced.

For this reason, there is a possibility that the internal pressure of the gas cylinder 24 further increases from the above-described operating pressure, and reaches or exceeds a predetermined explosion-proof pressure lower than the burst pressure of the gas cylinder 24, for example, 1.5 MPa.
In the present invention, the explosion-proof pressure is preferably set to a predetermined pressure of less than 1.5 MPa and more than 0.6 MPa, and is set to a predetermined pressure within a range of 1.3 MPa or more and less than 1.5 MPa. It is more preferable to set the pressure within a range of 1.4 MPa ± 7%, that is, a predetermined pressure within a range of 1.302 MPa to 1.498 MPa.
Even in such a case, in the governor 20 provided with the pressure sensing safety device 48 of the present invention, in the state shown in FIG. 6, the inside of the gas cylinder 24 and the inside of the covering member 80, that is, the large diameter of the covering member 80 and the stem 66. Gas that functions as a pressure sensing chamber 94, a region between the front end portion of the portion 66a, a region between the inclined portion 61a of the medium diameter hole portion 60c of the through hole 60 and the outer periphery of the large diameter portion 66a of the stem 66 Since the passage 64 and the region in the valve chamber 84 above the valve body 86 of the relief valve 44 communicate with each other, the internal pressure of the gas cylinder 24 is applied to the surface of the top 86 b of the valve body 86 of the relief valve 44.

The spring strength of the push spring 90 is set so that the push spring 90 is compressed above the explosion-proof pressure, and when the pressure spring falls below the explosion-proof pressure, the push spring 90 is expanded and returned.
For this reason, when the internal pressure of the gas cylinder 24 reaches or exceeds the above-described explosion-proof pressure, a pressure higher than the explosion-proof pressure is applied to the surface of the top 86b of the valve body 86 of the relief valve 44. When the pressure overcomes the push spring 90, as shown in FIG. 7, the push spring 90 is compressed, the valve body 86 moves backward and moves downward in the figure, and the seal member 88, for example, the O-ring is moved. The relief valve 44 is opened away from the valve seat 84d, which is the sealing surface of the valve chamber 84, the interior of the valve chamber 84 communicates with the gas discharge passage 92, and the gas is discharged to the outside.
Thereafter, when the internal pressure of the gas cylinder 24 is lowered from the above explosion-proof pressure, the pressure applied to the surface of the top portion 86b of the valve body 86 is also lowered from the explosion-proof pressure. Returning to the above, the seal member 88 of the valve body 86 can be in airtight contact with the valve seat 84 d of the valve chamber 84. Thus, the relief valve 44 returns to the closed state.

In the above-described example, the relief valve 44 having the valve chamber 84 having a different inner diameter and the valve body 86 having a different outer diameter including the seal member 88 is used as the explosion-proof valve, but the present invention is not limited thereto. When the internal pressure of the small gas cylinder rises abnormally further from the above operating pressure and exceeds the specified explosion-proof pressure below the burst pressure of the small gas cylinder, the explosion-proof pressure is detected and the gas from the small gas cylinder is released to the outside. Any structure may be used as long as it is possible.
For example, as shown in FIG. 8B, the relief valve 44a is formed in the apparatus main body 46, and is accommodated in a valve chamber 94 communicating with the gas passage 64, and slidable in the valve chamber 94 up and down in the figure. A valve body 96, a seal member 88 attached to a receiving groove 96a provided along the circumferential direction of the valve body 96, and a direction in which the seal member 88 is in close contact with the inner wall surface of the valve chamber 94. That is, it includes a push spring 90 that urges the valve body 96 upward in the drawing, and a gas discharge passage 92 that is formed in the apparatus main body 46 and communicates the valve chamber 94 with the outside of the apparatus. Since the relief valve 44a shown in FIG. 8B has the same components as the relief valve 44 shown in FIG. 8A, the same components are denoted by the same reference numerals and detailed description thereof is omitted. Description is omitted.
The valve chamber 94 is a cylindrical chamber having the same inner diameter. The valve chamber 94 communicates with the pressure sensing chamber 78 by the gas passage 64 at the upper side in the drawing, communicates with the gas discharge passage 92 at the center in the drawing, and pushes at the lower side in the drawing. The spring 90 is accommodated.

In the illustrated example, the inner wall surfaces of the upper and lower regions of the valve chamber 94 sandwiching the gas discharge passage 92 constitute a valve seat to which a seal member 88 attached to the valve body 96 is in close contact. In the illustrated example, the pressure applied to the upper part (top) of the valve body 96, that is, the pressure receiving surface is lower than the explosion-proof pressure, the valve body 96 is urged upward by the push spring 90, and the seal member 88 is connected to the gas discharge passage 92. When on the upper side, the gas discharge passage 92 is cut off from the region communicating with the gas passage 64 above the valve body 96 in the valve chamber 94 by the valve body 96 and the sealing material 88, and the relief valve 44a is closed. It becomes. On the other hand, the pressure applied to the pressure receiving surface at the upper part of the valve body 96 becomes the explosion-proof pressure or more, and the push spring 90 is defeated by the pressure and compressed, so that the valve body 96 moves backward and the seal member 88 is moved. When the gas discharge passage 92 is below the gas discharge passage 92, the gas discharge passage 92 communicates with a region communicating with the gas passage 64 above the valve body 96 of the valve chamber 94, so that the relief valve 44 a is in an open state. Become.
The lower end wall of the valve chamber 94 is connected to the cylindrical projecting portion 83a of the apparatus main body 46 forming the valve chamber 94 and the cylindrical member 83b having one end closed by screwing the female screw portion 85a and the male screw portion 85b. Then, it is formed by fixing.
In the relief valve 44a, the gas passage 64 communicating with the pressure sensing chamber 78 and the upper region of the valve chamber 94 defined by the valve body 96 also function as the pressure sensing chamber 94 for controlling the operation of the relief valve 44a. To do.

Further, as shown in FIG. 8C, the relief valve 44b includes a cylindrical protrusion 97a of the apparatus main body 46 and a cylindrical member closed at one end thereof connected and fixed to the inside thereof by screwing from below. The valve chamber 98 is formed by 97b and communicates with the gas passage 64, the valve body 100 accommodated in the valve chamber 98 so as to be slidable in the vertical direction in the figure, and attached to the ceiling of the valve chamber 98 along the circumferential direction. A seal member 102, a push spring 104 that is disposed in the valve chamber 98 and urges the valve body 96 in a direction in which the valve body 100 is in close contact with the seal member 102, that is, in an upward direction in the drawing, And a gas discharge passage 106 communicating with each other. The protruding portion 97a and the member 97b are fixed by screwing by screwing the male screw portion 99b formed on the cylindrical outer periphery of the member 97b into the female screw portion 99a formed in the cylindrical concave portion of the protruding portion 97a. Can do.
The valve chamber 98 is a cylindrical chamber having the same inner diameter. The valve chamber 98 communicates with the pressure sensing chamber 78 through the gas passage 64 on the upper side in the drawing, the seal member 102 is disposed at the ceiling portion, and the tip of the member 83b is used to connect the ceiling to the ceiling. The pressing spring 104 is accommodated on the lower side in the drawing and communicated with the gas discharge passage 106 at the lower center in the drawing.

In the illustrated example, the valve body 96 has an annular protrusion on the seal member 102 side, on the upper side in the drawing. In the relief valve 44b of the illustrated example, the pressure applied to the pressure receiving surface of the upper portion (top) of the valve body 100 is lower than the explosion-proof pressure, and the valve body 100 is urged upward by the push spring 104. The protrusion 100a is in close contact with the annular seal member 102, the region in the valve chamber 98 communicating with the gas passage 64 above the valve body 100 and the gas discharge passage 106 are blocked, and the relief valve 44b is in a closed state. Become.
On the other hand, the pressure applied to the pressure receiving surface at the upper part of the valve body 100 becomes the explosion-proof pressure or more, and the push spring 104 is defeated by the pressure and compressed, so that the valve body 100 moves backward and the valve body 100 When the annular protrusion 100a is separated from the seal member 88, the gas discharge passage 106 is communicated with a region communicating with the gas passage 64 above the valve body 100 in the valve chamber 98, so that the relief valve 44b is in an open state. It becomes.
In the relief valve 44b, the gas passage 64 communicating with the pressure sensing chamber 78 and the upper region in the figure of the valve chamber 98 defined by the valve body 100 also function as a pressure sensing chamber for controlling the operation of the relief valve 44b. .
The relief valves 44a and 44b operate in the same manner as the relief valve 44.

In the example described above, the relief valves 44, 44a, and 44b are configured to open when the explosion-proof pressure is exceeded, and return to the closed state when the explosion-proof pressure is reduced. However, the present invention is not limited to this. The relief valve may be provided with a lock mechanism that locks in the open state so that the open state is maintained when the explosion-proof pressure is exceeded.
Thus, as a relief valve provided with the lock mechanism which locks in an open state, the relief valve 44c shown to FIG. 9 (A)-FIG. 9 (F) etc. can be mentioned, for example. Since the relief valve 44c shown in FIGS. 9A and 9B has the same components as the relief valve 44 shown in FIG. 8A, the same components are denoted by the same reference numerals. Detailed description thereof will be omitted.

As shown in FIGS. 9A and 9B, the relief valve 44 c is formed in the apparatus main body 46, communicates with the gas passage 64, and has a valve chamber 108 having an opening 109 at the bottom, and the valve chamber 108 is illustrated in FIG. The valve body 110 is slidably stored in the middle and up and down, and has a protrusion 110a that protrudes to the outside from the opening 109 at the bottom of the valve chamber 108, and a receiving groove 110b provided in the valve body 110 along the circumferential direction. The seal member 88 is disposed in the valve chamber 108, the push spring 90 biasing the valve body 110 in the direction in which the seal member 88 is in close contact with the inner wall surface of the valve chamber 108, that is, the upward direction in the figure, and the device main body 46. A gas discharge passage 92 formed to communicate between the valve chamber 108 and the outside of the apparatus; a support member 112 that protrudes downward from the apparatus main body 46 adjacent to the valve chamber 108; and a tip of the support member 112. Rotating support A relief valve lock lever 114 that engages with an engagement recess 110 c provided in the vicinity of the protrusion 110 a of the valve body 110 in the circumferential direction to restrain the movement of the valve body 110, and a tip of the lock lever 114. A spring that biases 114a toward the valve body 110, a torsion spring 116 in the illustrated example, is provided.
Here, the engagement recess 110c of the valve body 110 protruding from the opening 109 of the valve chamber 108, the lock lever 114, and the spring 116 constitute a lock mechanism 118 of the relief valve 44c.

The valve chamber 108 is formed inside from a cylindrical projecting portion 83a of the apparatus main body 46 and a cylindrical member 83c that is connected to the projecting portion 83a by screwing and forms a bottom portion having an opening 109. The protruding portion 83a and the member 83c are fixed by screwing. The male screw portion 85a formed on the cylindrical outer periphery of the protruding portion 83a is formed in the cylindrical recessed portion of the member 83c on the lower side of the gas discharge passage 92 in the figure. This can be done by screwing into the female thread portion 85c.
The valve chamber 108 is on the upper side in the drawing, communicated with the pressure sensing chamber 78 by the gas passage 64, and has a small diameter hole portion 108 a having a constant inner diameter, and on the lower side in the drawing, and accommodates the pressing spring 90. Between the large-diameter hole portion 108b having an inner diameter larger than the internal diameter of the portion 108a and between the small-diameter hole portion 108a and the large-diameter hole portion 108b, and the inner diameter changes from the inner diameter of the small-diameter hole portion 108a to the inner diameter of the large-diameter hole portion 108b. And an inclined hole portion 108c having an inclined inner wall surface. A gas discharge passage 92 communicates with the inclined hole portion 108 c of the valve chamber 108. The large diameter hole portion 108 b communicates with the opening 109.

The inclined inner wall surface of the inclined hole portion 108c constitutes a valve seat 108d to which the seal member 88 attached to the valve body 110 is in close contact or separated. The seal member 88 attached to the valve body 110 closes or opens the relief valve 44 by closely contacting or separating from the valve seat 108d.
The valve body 110 includes a space between a top portion 110d that moves in the small-diameter hole portion 108a, an inclined portion 110e that is provided with a receiving seat 110a to which the seal member 88 is attached, and a member 83b that is a lower end wall of the valve chamber 4. And a body portion 110f provided with a projecting portion 110a projecting from the opening 109 at the tip thereof.
In the relief valve 44 c, the gas passage 64 communicating with the pressure sensing chamber 78 and the upper region in the figure of the valve chamber 108 defined by the top 110 d of the valve body 110 are also the pressure sensing chamber for controlling the operation of the relief valve 44. 94 functions.

  The lock lever 114 is a flat plate member that rotates on a plane perpendicular to the moving direction of the valve body 110, and engages with an engagement recess 110 c of the valve body 110 to restrain the valve body 110. A rotation center portion 114b that is rotatably supported by the support member 112 using a screw 112a, a long hole 114c that restricts a rotation region of the lock lever 114, and a rotation center portion with respect to the long hole 114c. And an L-shaped portion 114d that is bent vertically on a side facing 114b. The support member 112 is provided with a cylindrical member 112b that is inserted into the elongated hole 114c of the lock lever 114 and restricts the rotation of the lock lever 114. The L-shaped portion 114d of the lock lever 114 rotates the lock lever 114 about the rotation center portion 114b against the urging force of the torsion spring 116 when the relief valve 44c is unlocked. It functions as a pressing portion for removing 114a from the engagement recess 110c of the valve body 110 and separating it.

The operation of the relief valve 44c and the lock mechanism 118 will be described.
In the relief valve 44c, the internal pressure of the gas cylinder 24 communicates with the gas passage 64 functioning as the pressure sensing chamber 94 and the region surrounded by the surface of the top 110c of the valve body 86 of the relief valve 44c and the inner wall surface of the valve chamber 108. Therefore, the internal pressure of the gas cylinder 24 is applied to the surface of the top 110d of the valve body 110 of the relief valve 44c.
For this reason, when the relief valve 44c is lower than the explosion-proof pressure described above, which is lower than the burst pressure of the gas cylinder 24, as shown in FIGS. 9A and 9B, the seal member 88 of the valve body 110 is Energized by the push spring 90, the gas release passage 92 is in a “closed” state shut off from the pressure sensing chamber 94 while being tightly adhered to the valve seat 108d, which is the sealing surface of the valve chamber 108, to keep airtight. In this state, the distal end 114a of the relief valve lock lever 114 is in contact with the outer peripheral surface of the protrusion 110a of the body 110f of the valve body 110, and the lock mechanism 118 that cannot restrain the movement of the valve body 110 is It is in a released state.

Next, when the internal pressure of the gas cylinder 24 further increases from the above-described operating pressure and reaches or exceeds the above-described explosion-proof pressure that is lower than the burst pressure of the gas cylinder 24, a pressure equal to or higher than the explosion-proof pressure is applied to the valve body 110 of the relief valve 44c. It will be loaded on the surface of the top 110d. When the pressure overcomes the push spring 90, as shown in FIGS. 9C and 9D, the push spring 90 is compressed, the valve body 110 moves backward and moves downward in the figure, and the seal The member 88 is separated from the valve seat 108d, which is the sealing surface of the valve chamber 108, the relief valve 44c is opened, the interior of the valve chamber 108 communicates with the gas discharge passage 92, and the gas is released to the outside. At the same time, the protrusion 110a of the valve body 110 further protrudes from the opening 109, and the engagement recess 110c of the body 110f protrudes from the opening 109 to the outside. As a result, the distal end 114a of the relief valve lock lever 114 is engaged with the engagement recess 110c of the body 110f of the valve body 110, and the movement of the valve body 110 is restrained.
As a result, the relief valve 44c remains open and the lock mechanism 118 is in operation. As long as the internal pressure of the gas cylinder 24 is higher than atmospheric pressure, the gas is released from the gas discharge passage 92 to the outside. to continue.

Thereafter, in order to release and reset the lock mechanism 118 of the relief valve 44c, as shown in FIGS. 9E and 9F, the L-shaped portion 114d of the lock lever 114 is pushed in the direction of the arrow. When the lock lever 114 is lowered and the distal end portion 114a is pulled out of the engagement recess 110c of the valve body 110 and separated, the compressed spring 90 is extended and the valve body 110 is pushed back. The seal member 88 of the valve body 110 comes into close contact with the valve seat 108 d of the valve chamber 108 in an airtight manner, and the gas discharge passage 92 returns to the “closed” state that is blocked from the pressure sensing chamber 94. Thus, the relief valve 44 returns to the closed state.
Note that the relief valve 44c shown in FIGS. 9A to 9F is obtained by slightly modifying the relief valve 44 shown in FIGS. 4 to 8A and providing a lock mechanism 118. Of course, the present invention is not limited to this, and a lock mechanism may be attached to FIGS. 8B and 8C, and a relief mechanism other than this may be provided.

In the relief valves 44 and 44c shown in FIGS. 8 (A) and 9 (A), the valve body 86 includes one seal member 88. However, the present invention is not limited to this, and the operation of the relief valve is not limited thereto. For stabilization, the valve body may be provided with two or more sealing members.
The relief valve 44d shown in FIGS. 10 (A) to 10 (C) has a cylindrical shape that is connected and fixed to the cylindrical concave portion of the cylindrical protruding portion 120 of the apparatus main body 46 and the inside thereof by screwing from below. A valve chamber 124 formed by a cylindrical concave portion of the member 122 and communicating with the gas passage 64, a valve body (vent pin) 126 slidably accommodated in the valve chamber 124 in the vertical direction in the figure, and a valve body 126, seal members 128a and 128b attached to two receiving grooves 127a and 127b provided along the circumferential direction, respectively, and a direction in which the seal member 128a is in close contact with the inner wall surface of the valve chamber 124. That is, it has a push spring 90 that urges the valve body 126 upward in the figure, and a gas discharge passage (vent passage) 130 that is formed in the cylindrical member 122 and communicates with the valve chamber 124 and the outside of the apparatus. .

The projecting portion 120 is a cylindrical member having a concave portion with a different cylindrical inner diameter that is open on the lower side in the drawing, and is a small diameter hole portion on the upper side in the drawing and having a predetermined inner diameter communicating with the gas passage 64. 120a, an inclined inner wall surface inclined at a predetermined angle from the inner diameter of the small-diameter hole portion 120a, an inclined hole portion 120b expanding to a predetermined inner diameter, a predetermined inner diameter larger than the maximum inner diameter of the inclined hole portion 120b, and a cylinder A connection hole 120c to which the member 121b is connected, and a female screw part 120d formed in the connection hole 120c.
The cylindrical member 122 is provided on the lower side in the figure, and includes a bottom part with a circular opening 123 having a predetermined inner diameter at the center and a recess having a different cylindrical inner diameter opened on the upper side in the figure. A large-diameter hole 122a which is a cylindrical member and has an inner diameter slightly larger than the maximum inner diameter of the inclined hole 120b of the projecting portion 120, and is located below the large-diameter hole 122a in the drawing, and from the large-diameter hole 122a. A housing hole 122b having a small inner diameter and housing the push spring 90, a receiving groove 122c formed on the upper end surface and housing the sealing member 128c, and formed on the outer periphery on the upper side in the drawing, the projecting portion 120 connecting hole 120c. And a male screw part 122d to be screwed with the female screw part 120d.

The projecting portion 120 and the member 122 are arranged such that the seal member 128c attached to the receiving groove 122c of the member 122 is in close contact with the lower end portion of the projecting portion 120. It is connected and fixed by screwing the male screw part 122d.
The valve chamber 124 is formed by the connected and fixed projecting portion 120 and the respective concave portions of the member 122. The valve chamber 124 is formed as a recess in the projecting portion 120, and has a small diameter hole portion 120 a communicating with the pressure sensing chamber 78 via the gas passage 64, and an inclined hole having an inclined inner wall surface whose inner diameter increases from the small diameter hole portion 120 a. The portion 120b includes a large-diameter hole portion 122a that is formed as a concave portion in the member 120 and communicates with the gas discharge passage 130, and a housing hole portion 122b that houses the push spring 90.

  The inclined inner wall surface of the inclined hole portion 120b constituting the valve chamber 124 constitutes a valve seat to which the first seal member 128a attached to the valve body 126 is closely attached or separated. The inner wall surface of the large-diameter hole portion 122a constituting the valve chamber 124 constitutes a sliding surface on which the second seal member 128b attached to the valve body 126 slides. As shown in FIGS. 10A and 10B, the first seal member 128a attached to the valve body 126 is in close contact with or separated from the valve seat of the inclined hole portion 120b, whereby the valve chamber 124 is obtained. The relief valve 44d is opened and closed in the first stage by blocking or communicating the small-diameter hole portion 120a and the large-diameter hole portion 122a constituting the above-mentioned through the inclined hole portion 120b. Further, as shown in FIGS. 10B and 10C, the second seal member 128b attached to the valve body 126 has a sliding surface of the large-diameter hole 122a in the drawing of the gas discharge passage 130. By sliding up and down, the large-diameter hole portion 122a and the gas discharge passage 130 are blocked or communicated, and the relief valve 44d is opened and closed in the second stage, and the relief valve 44d is completely closed or opened. To do.

The valve body 126 moves in the small diameter hole portion 120a and the inclined hole portion 120b, and has a cylindrical top portion 126a having an outer diameter smaller than the inner diameter of the small diameter hole portion 120a, and an inclined inner wall surface of the inclined hole portion 120b of the protruding portion 120. In the same manner as above, the inclined portion 126b having an inclined outer wall surface whose outer diameter is increased from the outer diameter of the top portion 126a and the inside of the large-diameter hole portion 122a of the member 122 are moved and smaller than the inner diameter of the large-diameter hole portion 122a A large-diameter portion 126c having an outer diameter larger than the outer diameter of the top portion 126a and equal to the maximum outer diameter of the inclined portion 126b, and an outer diameter smaller than the outer diameter of the large-diameter portion 126c. A body portion 126d penetrating through the body 123.
The receiving groove 127a to which the first seal member 128a is attached is provided between the top portion 126a and the inclined portion 126b, and the receiving groove 127b to which the second seal member 128b is attached is the outer periphery of the large diameter portion 126c. Provided on the body 126d side. An engagement recess 126e is provided on the distal end side of the body 126d of the valve body 126. The engagement recess 126e may be used to provide a lock mechanism as shown in FIG. 9A and engage a lock lever (not shown) to restrain the movement of the valve body 126.

The push spring 90 is a coil spring, and is inserted and arranged on the outer periphery of the trunk portion 126 d and is arranged so as to be sandwiched between the lower end portion of the large diameter portion 126 d of the valve body 126 and the bottom portion of the member 122.
In the first-stage opening operation of the relief valve 44d, the seal member 128a is initially in close contact with the inclined inner wall surface of the inclined hole portion 120b, so that the gas passage 64 and the seal member communicating with the pressure sensing chamber 78 are used. A region sandwiched between the small-diameter hole portion 120a and the top portion 126a of the valve body 126, which is partitioned by 128a, functions as a pressure sensing chamber 132a that controls the first-stage opening / closing operation of the relief valve 44d.
In the second stage opening operation of the relief valve 44d, the seal member 128a is detached from the inclined inner wall surface of the inclined hole portion 120b, but the seal member 128b is smaller in diameter than the gas discharge passage 130. Since it is in close contact with the large-diameter hole portion 122a on the side, that is, the upper side in the figure, the gas passage 64, the small-diameter hole portion 120a, the inclined hole portion 120b, and the top portion 126a and the inclined portion 126b of the valve body 126 communicate with the pressure sensing chamber 78. And the region sandwiched between the large-diameter hole portion 122a delimited by the seal member 128b and the large-diameter portion 126c of the valve body 126 is the second stage opening / closing operation of the relief valve 44d, that is, the relief valve 44d. It functions as a pressure sensing chamber 132a for controlling the opening / closing operation.

As described above, in the relief valve 44d, the first and second sealing members 128a and 128b are provided on the valve body 126, and the opening and closing operation of the relief valve 44d is performed in two stages, whereby the opening and closing operation of the relief valve 44d is performed. Stability and reproducibility can be improved.
That is, as shown in FIG. 10A, when the internal pressure of the gas cylinder 24 is equal to or less than a predetermined set explosion-proof pressure, the pressure in the pressure sensing chamber 132a is also equal to or less than the set explosion-proof pressure, and the pressure applied to the top 126a of the valve body 126 is also set. Since the pressure is below the explosion-proof pressure, the relief valve 44 d does not operate, and the first seal member 128 a of the valve body 126 is pressed against the inclined inner wall surface of the inclined hole portion 120 b constituting the valve chamber 124 by the push spring 90. The region between the small diameter hole portion 120a and the top portion 126a and the region between the large diameter hole portion 122a and the large diameter portion 126c are blocked. At this time, the second seal member 128b is in close contact with the inner wall surface of the large-diameter hole 122a constituting the valve chamber 124 on the upper side in the drawing than the gas discharge passage 130 and on the inclined hole 120b side. The region between the large-diameter hole portion 122a and the large-diameter portion 126c is blocked from the gas discharge passage 130.

  Thereafter, as shown in FIG. 10B, when the internal pressure of the gas cylinder 24 reaches a predetermined set explosion-proof pressure, the pressure in the pressure sensing chamber 132a reaches the set explosion-proof pressure, and the set explosion-proof pressure is applied to the top 126a of the valve body 126. Is applied, the pressure spring 90 is compressed, the valve body 126 moves backward, the relief valve 44d performs the first stage opening operation, and the first seal member 128a is moved from the inclined inner wall surface of the inclined hole portion 120b. Separately, the region between the small-diameter hole portion 120a and the top portion 126a and the region between the large-diameter hole portion 122a and the large-diameter portion 126c communicate with each other, and the gas flows between the large-diameter hole portion 122a and the large-diameter portion 126c. Flows into the area between and fills both areas. Also at this time, the second seal member 128b has a large-diameter hole portion constituting the valve chamber 124 on the upper side in the drawing from the gas discharge passage 130 and on the inclined hole portion 120b side, as in the case of FIG. In close contact with the inner wall surface of 122a, the region between the large-diameter hole portion 122a and the large-diameter portion 126c and the gas discharge passage 130 are blocked.

  As a result, the gas pressure that has reached the set explosion-proof pressure is applied to the top portion 126a, the inclined portion 126b, and the large diameter portion 126c of the valve body 126, that is, the valve body when the pressure receiving portion is shown in FIG. Compared to the surface of the top portion 126a of 126, in the case shown in FIG. 10B, the sum of the surfaces of the top portion 126a, the inclined portion 126b, and the large-diameter portion 126c of the valve body 126 becomes larger. The thrust in the axial direction is increased, the push spring 90 is further compressed, the valve body 126 is further retracted, the relief valve 44d performs the second stage opening operation, and the second seal member 128b is As shown in FIG. 10C, the large-diameter hole portion is in close contact with the inner wall surface of the large-diameter hole portion 122a constituting the valve chamber 124 on the lower side in the drawing than the gas discharge passage 130 and on the push spring 90 side. Between 122a and the large diameter portion 126c Communicating with frequency, and a gas discharge passage 130, a relief valve 44d is fully opened state, the valve chamber 124 is communicated with the gas discharge passage 130, gas is released to the outside.

Thereafter, when the internal pressure of the gas cylinder 24 falls below the above explosion-proof pressure, the pressure applied to the surface of the valve body 126 also falls below the explosion-proof pressure, so that the compressed compression spring 90 expands and returns to its original state. As shown in FIG. 10 (A), the first seal member 128a of the valve body 126 is hermetically adhered to the valve seat of the valve chamber 124 (the inclined inner wall surface of the inclined hole portion 120b), and the second seal member 128b. Can be in close contact with the inner wall surface of the large-diameter hole portion 122a constituting the valve chamber 124 on the upper side in the figure than the gas discharge passage 130 and on the inclined hole portion 120b side. Thus, the relief valve 44d returns to the closed state.
As an explosion-proof valve, also in this embodiment, a lock mechanism as shown in FIG. 9A may be provided so that the relief valve 44d is locked in an open state.

In the pressure sensing safety device of the present invention, the various relief valves described above can be used as the explosion-proof valve, but the present invention is not limited to this, and various relief valves can be applied, The decompressor and the gas shut-off safety mechanism constituting the governor using the pressure sensing safety device of the present invention are not limited to the above-described examples, and various decompressors and gas shut-off safety mechanisms can be used.
For example, the pressure reducer 40 described above is not limited to the illustrated example, and any pressure regulator 40 may be used as long as the pressure of the gas supplied to the burner 16 can be reduced and adjusted appropriately. There may be a conventionally known pressure regulator. For example, a pressure regulator disclosed in Japanese Patent No. 3601701 related to the present applicant can be used.
Further, the above-described gas shut-off safety mechanism 42 is not limited as long as the gas flow (internal pressure) of the gas cylinder 24 rises to the above-mentioned operating pressure or higher so that the gas flow can be shut off by sensing this operating pressure. Alternatively, except for the gas passage 64 leading to the relief valve 44, a so-called conventional passage blocking type pressure sensing safety device or a conventionally known passage blocking type pressure sensing safety device may be used. . For example, the pressure sensing safety device disclosed in Japanese Patent Application Laid-Open No. 2002-221299 according to the applicant's application can be used.

  The gas shut-off safety mechanism used in the present invention includes a stem that is pushed by the nozzle portion when the small gas container is mounted and can retract the through hole of the apparatus body against the spring, and the internal pressure of the small gas container is abnormal. When the pressure rises, the pressure is detected and the stem is retracted so that the gas passage can be shut off. Provided on the front side of the working chamber provided in the passage, on the rear side of the working chamber provided in the gas passage is an inner seat portion that can shut off the gas passage in contact with the stem that has retreated due to abnormally increased pressure in the event of an abnormality. It is preferable that the gas ejected from the nozzle portion can pass through the working chamber and flow out into the decompression chamber when the stem leaves the outer seat portion by mounting the small gas container.

The specific structure of the gas shut-off safety mechanism is provided with a stem that senses the pressure when the internal pressure of the small gas container rises abnormally, and the gas passage can be shut off by the movement. It is composed of a member that penetrates the apparatus main body having a pressure receiving portion that receives the internal pressure of the small gas container, and is slidable in the through hole of the apparatus main body. An inner seat is provided, and the outer seat is in contact with the stem so that the outside of the working chamber can be shut off, and the gas ejected from the nozzle portion can flow out of the working chamber by installing a small gas container. And the inner seat portion can contact the retracted stem of the stem in an abnormal state so that the outside of the working chamber can be shut off, and the stem is preferably provided with a restraining member for restraining the retracted stem.
The small gas cylinder mounting part structure is composed of a cover member provided at the front end of the stem and a connection port member for holding the cover member. The cover member has a hole through which the front end of the stem can enter and exit. And a nozzle receiving portion that abuts and presses the nozzle portion when the small gas container is mounted.

Here, the pressure receiving portion that receives the internal pressure of the small gas container can be formed at the front end portion of the stem or both the front end portion and the rear end portion of the gas passage. The stem can be formed of a substantially single member or a combination of two or more members. Further, the stem is biased forward from the apparatus main body, and the bias is preferably performed by a spring provided in the gas passage, a spring provided behind the gas passage, or both of them. . Furthermore, the stem is hermetically sealed in the through hole of the safety device main body behind the gas passage by a seal member provided therein or by a seal member attached to the stem, and receives the abnormal pressure of the combustion gas entering the gas passage. The stem can be retracted. Further, a seal member is provided in contact with one or both of the outer seat and / or the inner seat of the working chamber formed in the gas passage in the stem, or one or both of the outer seat and the inner seat. Preferably, a seal member in contact with the stem is provided to complete the seal. A check valve biased forward from the stem by a spring may be further provided in front of the stem.
The restraining member is a torsion spring that engages with the rear end portion of the stem when the stem is retracted to a position where it comes into contact with the inner seat portion, and is capable of releasing the restraint, particularly acting in the crossing direction with respect to the stem. Is preferably used.

  As mentioned above, although various embodiments and examples of the pressure sensing safety device and governor according to the present invention have been described in detail, the present invention is not limited to these embodiments and examples, and the gist of the present invention. It goes without saying that various improvements or changes may be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Cassette cooker 12 Burner accommodating part 12a, 14a Case 12b Top plate 14 Cylinder accommodating part 16 Burner 18 As such 20 Governer 22 (Lever type) Cylinder attaching / detaching device 24 Gas cylinder 24a Upper peripheral edge 24b Bottom peripheral edge 24c Nozzle part 26 Removable lever 28 Link mechanism DESCRIPTION OF SYMBOLS 30 Sliding plate 32 Detachable device main body 34, 36 Support claw 38 (Coil) spring 40 Decompressor 42 Gas shut-off safety mechanism 44, 44a, 44b, 44c, 44d Relief valve 46 Device main body 48 Pressure sensing safety device 50 Decompression chamber 52 Cap 54 Diaphragm 56 Spring 58 Connector 60 Through-hole 62, 64 Gas passage 66 Stem 66a Large diameter portion 66b Small diameter portion 66c, 66d Receiving groove 66e Engaging recess 68a, 68b, 88, 128a, 128b Seal member 70 Spring accommodating portion 72 , 9 0, 104 Push spring 74 Insertion port member 74a Insertion port 74a
76 Engaging member 78, 94, 132a, 132b Pressure sensing chamber 80 Cover member 80a Hole 82 Restraining member 83a, 120 Protruding portion 83b, 122 Cylindrical member 84, 94, 98, 108, 124 Valve chamber 84d, 108d Valve seat 86, 96, 100, 110, 126 Valve body 86a, 96a, 110b, 127a, 127b Receiving groove 92, 106, 130 Gas discharge passage 112 Support member 114 (Relief valve) Lock lever 116 Spring (torsion spring)
118 Locking mechanism

Claims (9)

A gas shut-off safety mechanism that senses the operating pressure and shuts off the gas flow from the small gas container when the internal pressure of the mounted small gas container abnormally rises above a predetermined operating pressure;
When the internal pressure of the small gas container further abnormally rises from the operating pressure and exceeds a predetermined explosion-proof pressure less than the burst pressure of the small gas container, the gas from the small gas container is detected by sensing the explosion-proof pressure. A pressure-sensing safety device, comprising: an explosion-proof valve that opens the flow of gas to the outside. The gas shut-off safety mechanism shuts off a gas passage from the small gas container,
The pressure sensing safety device according to claim 1, wherein the explosion-proof valve senses the explosion-proof pressure and opens the gas passage to the outside. The operating pressure is a predetermined pressure within a range of 0.4 MPa to 0.6 MPa,
The pressure sensing safety device according to claim 1 or 2, wherein the explosion-proof pressure is a predetermined pressure within a range of more than 0.6 MPa and less than a bursting pressure of the small gas container.   The pressure-sensing safety device according to claim 3, wherein the explosion-proof pressure is a predetermined pressure within a range of 1.3 MPa or more and less than 1.5 MPa. The explosion-proof valve is
A valve chamber that communicates with the gas passage, a valve body that is slidably housed in one direction in the valve chamber, and is disposed along the circumferential direction so as to be interposed between the valve chamber and the valve body. A relief valve that is disposed in the valve chamber and has a push spring that biases the valve body in the one direction, and a gas discharge passage that communicates the valve chamber with the outside.
In the valve chamber, a pressure sensing chamber comprising a region of the valve chamber on the side communicating with the gas passage divided by the pressure receiving surface of the valve body is configured,
When the pressure applied to the pressure receiving surface of the valve body of the pressure sensing chamber is equal to or higher than the explosion-proof pressure, the pressure sensing chamber communicates with the gas discharge passage,
The pressure sensing chamber and the gas discharge passage are shut off when the pressure applied to the pressure receiving surface of the valve body of the pressure sensing chamber is less than the explosion-proof pressure. The pressure sensing safety device described. The seal member is attached to the valve body along a circumferential direction,
The push spring biases the valve body in a direction in which the seal member is in close contact with the inner wall surface of the valve chamber,
The inner wall surface of the valve chamber with which the seal member is in close contact is on the side communicating with the gas passage rather than the gas discharge passage,
The seal member is closely attached to the inner wall surface of the valve chamber, and the pressure sensing chamber and the gas discharge passage are shut off,
The pressure sensing safety device according to claim 5, wherein the seal member is separated from an inner wall surface of the valve chamber, and the pressure sensing chamber communicates with the gas discharge passage. The seal member is attached to the valve body along a circumferential direction,
The push spring biases the valve body toward the gas passage side,
The valve body slides in the valve chamber in a state where the seal member is in close contact with the inner wall surface of the valve chamber,
The seal member is brought into close contact with the inner wall surface of the valve chamber closer to the gas passage than the gas discharge passage, and the pressure sensing chamber and the gas discharge passage are shut off,
6. The pressure sensing safety device according to claim 5, wherein the pressure sensing chamber and the gas discharge passage are communicated with each other by bringing the seal member into close contact with an inner wall surface of the valve chamber farther from the gas passage than the gas discharge passage. The seal member is disposed along the circumferential direction on the ceiling of the valve chamber,
The push spring biases the valve body toward the gas passage side,
The valve body has an annular protrusion, and slides in the valve chamber so that the protrusion is in close contact with or separated from the seal member,
Close contact between the pressure sensing chamber and the gas discharge passage by bringing the protrusion of the valve body into close contact with the seal member;
The pressure sensing safety device according to claim 5, wherein the protrusion of the valve body is separated from the seal member to communicate the pressure sensing chamber and the gas discharge passage.   A governor comprising the pressure sensing safety device according to any one of claims 1 to 8.

Images