JP2005061577A - Fireproof valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire-proof valve of high reliability capable of surely and emergently sealing a fluid channel in the event of fire, and having high reliability for the prevention of secondary disaster. <P>SOLUTION: In this fireproof valve, a valve main body 5 is rotatably accommodated in a valve casing 3, an outer peripheral face 5b of the valve main body 5 is brought into contact with elastic seal members 8, 10 mounted in the valve casing 3 to seal the fluid channel L, when the valve main body 5 is rotated to a valve closing side, and further a thermal expansion member 13 mounted in the valve casing 3 is thermally expanded to emergently seal the fluid channel L, when the elastic seal members 8, 10 are heated in the valve closing state. The thermal expansion member 13 has the thermal expansion directionality by itself, and is mounted so that its thermally-expanding direction is an emergency sealing direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the valve main body is accommodated in the valve box so as to be rotatable, and the valve main body is rotated to the valve closing side so that the outer peripheral surface of the valve main body is provided in the valve box. When the elastic seal member is heated in contact with the elastic seal member, and the elastic seal member is heated in the closed state, the thermal expansion member disposed in the valve box is thermally expanded, and the fluid flow path The present invention relates to a refractory valve configured to be urgently sealed.

Such a refractory valve, for example, when the valve is exposed to a high temperature due to a fire or the like and the elastic seal member is heated and melted, the fluid flow path is urgently sealed by the thermal expansion of the thermal expansion member, and the fluid flows out. This is to prevent the occurrence of secondary disasters.
In this type of fire-resistant valve, conventionally, a rubber containing expanded graphite is used as a thermal expansion member, and in the event of a fire, the space between the valve body and the valve box is sealed by the thermal expansion of the rubber containing expanded graphite. A configuration in which the flow path is urgently sealed is known (see, for example, Patent Document 1).

Registered Utility Model No. 2518806 (Fig. 1)

However, in the valve described in the above publication, no consideration is given to the direction of thermal expansion of the expanded graphite-containing rubber as the thermal expansion member.
That is, the rubber with expanded graphite is usually not mixed so that the thermally expandable graphite particles are directed in a substantially constant direction, and is mixed in a so-called unoriented state, and therefore, in any direction when thermally expanding. Isotropic expansion that expands almost evenly.
Therefore, when the fluid flow path is urgently sealed with the expanded graphite-containing rubber having isotropic expansion, there is a problem in reliability, and there is room for improvement in this respect.

  The present invention pays attention to such a conventional problem, and its purpose is to prevent the occurrence of a secondary disaster in advance by more reliably urgently sealing the fluid flow path in the event of a fire. It is an object of the present invention to provide a highly reliable fireproof valve that can be used.

  According to a first characteristic configuration of the present invention, a valve body is accommodated in a valve box so as to be freely rotatable. When the valve body is rotated to the valve closing side, an outer peripheral surface of the valve body is When the fluid flow path is sealed by contacting an elastic seal member provided in the box and the elastic seal member is heated in the closed state, the thermal expansion member disposed in the valve box is thermally expanded. A fireproof valve configured to urgently seal the fluid flow path, wherein the thermal expansion member has a thermal expansion direction by itself, and the thermal expansion direction is the emergency seal. It is located so as to face the direction.

According to the first characteristic configuration of the present invention, when the elastic seal member is heated in the valve-closed state, the thermal expansion member for urgently sealing the fluid flow path by thermal expansion is the thermal expansion direction by itself. Since the thermal expansion member is arranged so that the direction of thermal expansion faces the emergency sealing direction, the thermal expansion member is surely directed toward the emergency sealing direction of the fluid flow path in the event of an emergency such as a fire. Thermal expansion.
Therefore, the emergency sealing function of the fluid flow path is greatly improved compared to conventional fire-resistant valves, and the fluid flow path is sealed more reliably, so that secondary disasters can occur in a highly reliable state. It can be prevented in advance.

  The 2nd characteristic structure of this invention exists in the place where the said thermal expansion member is arrange | positioned in the recessed groove opened in the said emergency sealing direction.

  According to the second characteristic configuration of the present invention, since the thermal expansion member is disposed in the recessed groove that opens in the emergency sealing direction, the thermal expansion directionality of the thermal expansion member itself and the concave By cooperating with the guide action in the emergency sealing direction by the groove, the emergency sealing function of the fluid flow path is further improved, and the occurrence of a secondary disaster can be prevented more reliably.

  A third characteristic configuration of the present invention is that the recessed groove is formed in the valve box so as to be integrally formed with the valve box.

  According to the third characteristic configuration of the present invention, the recessed groove for accommodating the thermal expansion member is formed in the valve box so as to be integrated with the valve box. Compared to the configuration and mounting in the valve box, the structure is simpler, and it is only necessary to form a recessed groove in the valve box, so that the cost of the valve can be reduced.

  According to a fourth characteristic configuration of the present invention, the thermal expansion member is configured in an annular shape and disposed on the outer peripheral portion of the valve main body and thermally expands in the direction of diameter reduction, thereby forming a spherical outer peripheral portion of the valve main body. It is configured to contact and urgently seal the fluid flow path.

  According to the fourth characteristic configuration of the present invention, the thermal expansion member is configured in an annular shape and disposed on the outer peripheral portion of the valve main body, and thermally expands in the diameter reducing direction to contact the spherical outer peripheral portion of the valve main body. The fluid flow path is urgently sealed, so that in the event of an emergency such as a fire, the annular thermal expansion member expands reliably in the direction of its diameter reduction, tightening the spherical outer periphery of the valve body from around Make sure the fluid flow path is urgently sealed.

  According to a fifth characteristic configuration of the present invention, a pair of the thermal expansion members are arranged on the upstream side and the downstream side of the fluid flow path in the outer peripheral portion of the valve body.

  According to the fifth characteristic configuration of the present invention, since a pair of annular thermal expansion members are arranged on the upstream side and the downstream side of the fluid flow path in the outer peripheral portion of the valve body, the pair of thermal expansion members are Each expands in the direction of reduced diameter, and the spherical outer periphery is tightened from the surroundings at two locations on the spherical outer periphery of the valve body to urgently seal the fluid flow path. It becomes.

Examples 1 to 3 of the fireproof valve according to the present invention will be sequentially described with reference to the drawings.
In addition, parts common to each embodiment and parts having the same action are denoted by the same reference numerals as much as possible, and in order to avoid redundant description, in principle, the same reference numerals are assigned to parts already described. The description is omitted.

As shown in FIGS. 1 to 3, the fire-resistant valve according to the first embodiment is incorporated in, for example, a gas plug for device connection, and the second flow with respect to the gas plug main body 1 having the first flow path L <b> 1. A cap 2 having a path L2 is screwed together, and the gas stopper body 1 and the cap 2 constitute a valve box 3 having a valve chamber inside.
A nut member 4 having a third flow path L3 is attached to the cap 2 constituting the valve box 3 so as to be relatively rotatable, and city gas and propane, which are examples of fluids, are obtained by the first to third flow paths L1 to L3. A fluid flow path L through which gas or the like flows along the arrow direction in the figure is formed.

A valve body 5 having a valve flow path L4 is rotatably accommodated in a valve chamber in the valve box 3, and a connecting projection 6 a having a square cross section formed at one end of the valve shaft 6 is formed in the valve body 5. The valve shaft 6 is fitted in the connecting hole 5a having a square cross section, and a handle 7 for rotating operation is attached to the other end of the valve shaft 6. By rotating the valve shaft 6 through the handle 7, the valve body 5 is configured to rotate around the rotation axis P.
The valve box 3, the nut member 4, the valve main body 5, the valve shaft 6 and the like are all formed of brass, and the valve box 3, the valve main body 5, the valve shaft 6 and the like constitute a fireproof valve.

A first annular step 9 for fitting and holding the annular first elastic seal member 8 is provided on the upstream side of the valve chamber in the valve box 3, that is, on the first flow path L1 side, and downstream of the valve chamber. On the side, that is, on the second flow path L2 side, a second annular step portion 11 that fits and holds the annular second elastic seal member 10 is provided.
These first and second elastic seal members 8 and 10 are made of, for example, a synthetic resin having an appropriate elasticity such as polytetrafluoroethylene resin, and are in sliding contact with the spherical outer peripheral surface 5b of the valve main body 5 to be in contact with the valve main body. 5 is configured to seal between the spherical outer peripheral surface 5b and the valve box 3.

An annular recessed groove 12 that opens toward the valve body 5 is formed in a portion closer to the rotational axis P than the first annular step 9 and is formed integrally with the valve box 3. The thermal expansion member 13 configured in an annular shape is inserted and disposed in the recessed groove 12.
The thermal expansion member 13 is made of, for example, a thermal expansion rubber made of NBR or CR rubber and graphite particles, and the mechanism of the thermal expansion is schematically shown in FIG. There is a substance called heat-expandable graphite containing an intercalation compound (sulfuric acid) between the layers, and the intercalation compound expands and vaporizes by heat to expand the graphite.

Usually, as shown in FIG. 5B, the thermally expanded rubber is mixed with plate-like thermally expandable graphite particles in an unoriented state, and therefore isotropically expands almost uniformly in all directions. Although the thermal expansion rubber of the present invention is mixed in an oriented state so that the plate-like thermally expandable graphite particles face a substantially constant direction, as shown in FIG. For this reason, anisotropic expansion that intensively expands in a certain direction is obtained.
That is, the thermal expansion rubber of the present invention itself has a thermal expansion directionality so that the expansion direction of the thermal expansion member 13 made of the thermal expansion rubber faces the opening side of the recessed groove 12. A thermal expansion member 13 is inserted and disposed in the recessed groove 12.
A receiving surface 14 with which the valve body 5 abuts at the time of emergency sealing, which will be described later, is formed at a position closer to the rotational axis P than the second annular step portion 11. Usually, the receiving surface 14 and the valve body 5 is set so that a slight gap is formed between the two.

Next, the operation of this fireproof valve will be described.
As described above, the valve body 5 is configured to be freely rotatable around the rotation axis P, and by rotating the handle 7 in the valve opening direction, as shown in FIG. L1 and the second flow path L2 communicate with each other via the valve flow path L4 of the valve main body 5 to be in a valve open state.
Conversely, when the handle 7 is turned in the valve closing direction, as shown in FIGS. 2 and 3, the first flow path L1 and the second flow path L2 are blocked by the valve body 5 and are closed. In this way, the valve body 5 is configured to be freely switchable between a valve open state and a valve closed state by a rotation operation.

When the first and second elastic seal members 8 and 10 are heated by the occurrence of a fire in the closed state of the heat resistant valve, the annular thermal expansion member 13 is in the thermal expansion direction, that is, in the diameter reduction direction. The fluid flow path L is urgently sealed even if both elastic seal members 8 and 10 are melted due to thermal expansion and contact with the spherical outer peripheral surface 5b of the valve body 5.
In other words, the thermal expansion member 13 is disposed in the recessed groove 12 that opens in the emergency sealing direction, and the thermal expansion direction is directed to the emergency sealing direction. As shown in FIG. 4, the thermal expansion member 13 surely thermally expands in the reduced diameter direction.
Due to the thermal expansion in the direction of the diameter reduction, the thermal expansion member 13 comes into contact with the spherical outer peripheral surface 5b of the valve body 5, and the valve body 5 slightly moves toward the second flow path L2 to contact the receiving surface 14. In this state, the spherical outer peripheral surface 5b is securely sandwiched and the fluid flow path L is urgently sealed.

As shown in FIGS. 6 and 7, the fire-resistant valve according to the second embodiment is incorporated in, for example, a gas plug for connecting a gas pipe, and has a first flow path L <b> 1 as in the first embodiment. The cap 2 having the second flow path L2 constitutes a valve box 3 having a valve chamber therein, and the valve box 3, the valve body 5, the valve shaft 6 and the like constitute a fireproof valve.
The difference between the fireproof valve of the second embodiment and that of the first embodiment is that not only the portion near the rotation axis P near the first annular step 9 but also the rotation shaft near the second annular step 11 is used. An annular recessed groove 12 that opens toward the valve body 5 side is formed in a portion near the center P and is formed integrally with the valve box 3, and the expansion groove 12 is also expanded in the recessed groove 12. An annular thermal expansion member 13 is inserted and arranged in a state where the direction is directed to the opening side of the recessed groove 12.

That is, in the fire resistant valve of Example 2, the thermal expansion member 13 having the thermal expansion direction and the thermal expansion direction facing the emergency sealing direction is provided on the upstream side and the downstream side of the fluid flow path L. A pair is arranged.
Therefore, in the fireproof valve of the second embodiment, when the first and second elastic seal members 8 and 10 are heated by the occurrence of a fire in the closed state, the pair of thermal expansion members 13 are shown in FIG. As shown in the figure, the fluid flow path L is surely thermally expanded in the reduced diameter direction, and the fluid flow path L is urgently sealed by sandwiching the spherical outer peripheral surface 5b of the valve body 5.

As shown in FIGS. 9 and 10, the fire-resistant valve according to the third embodiment is incorporated in a gas plug for connecting devices, for example, and has a first flow path L1 as in the first and second embodiments. 1 and the cap 2 having the second flow path L2 constitute a valve box 3 having a valve chamber inside, and the valve box 3, the valve body 5, the valve shaft 6 and the like constitute a fireproof valve.
In the fireproof valve of the third embodiment, a plate-like connection projection 6 b is formed at one end of the valve shaft 6, and the plate-like connection projection 6 b is inserted into a slit-like connection hole 5 c formed in the valve body 5. As shown in FIG. 10, the plate-like connecting projection 6 b and the slit-like connecting hole 5 c are configured to follow the fluid flow path L in the valve-closed state.

An annular laterally recessed groove 15 that opens toward the upstream side of the fluid flow path L that is the emergency sealing direction is formed in the valve box 3 at a portion outside the second annular step portion 11. Then, a thermal expansion member 16 having an annular shape is inserted and disposed in the laterally recessed groove 15.
The thermal expansion member 16 is also arranged so that the thermal expansion direction thereof faces the emergency sealing direction, that is, the opening side of the laterally recessed groove 15, and the first annular step portion 9 has a rotational axis P side. The corner portion is formed on a sealing surface 17 for urgently sealing the fluid flow path L by contact of the valve body 5.

In the fire-resistant valve of the third embodiment, when the first and second elastic seal members 8 and 10 are heated by the occurrence of a fire in the closed state, the thermal expansion member 16 is, as shown in FIG. The valve body 5 is thermally expanded toward the opening side of the laterally recessed groove 15 and presses the valve body 5 upstream of the fluid flow path L.
At that time, since the plate-like connection projection 6 b and the slit-like connection hole 5 c are along the fluid flow path L, only the valve body 5 slides upstream of the fluid flow path L and contacts the sealing surface 17. The fluid flow path L is urgently sealed.

  As mentioned above, although Example 1-Example 3 was demonstrated, in these each Example, the following various modifications are possible.

(1) In Example 1 and Example 2, an example in which the thermal expansion member 13 is inserted and disposed in the recessed groove 12 that opens toward the valve body 5 side is shown. In Example 3, the laterally recessed groove 15 However, the thermal expansion members 13 and 16 are not necessarily inserted and disposed in the recessed grooves 12 and 15. For example, the thermal expansion members 13 and 16 are provided in the valve box 3. It can also be engaged and held on a stepped portion or the like.
Further, in the case of being inserted into the recessed grooves 12 and 15, the recessed grooves 12 and 15 are not formed in the valve box 3 as in the previous embodiments, but are separated from the valve box 3. It is also possible to form the recessed groove with the member and attach the recessed groove member to the valve box 3 for implementation.

(2) In Examples 1 to 3, although the thermally expandable rubber containing thermally expandable graphite particles is shown as an example of the thermally expandable members 13 and 16, it is not particularly limited to the thermally expandable rubber. Although the example which formed the sealing members 8 and 10 from the polytetrafluoroethylene resin was shown, the elastic sealing members 8 and 10 can also be formed with various materials provided with moderate elasticity.
Furthermore, this fireproof valve is not limited to the valve for city gas and propane gas, but can be applied to valves for various gases and liquids that may cause a secondary disaster.

Longitudinal sectional view of a fireproof valve according to Example 1 Longitudinal sectional view of a fireproof valve according to Example 1 AA sectional view of the main part in FIG. Enlarged view of the main part in FIG. Schematic diagram showing the mechanism of thermal expansion of the thermal expansion member Longitudinal sectional view of a fireproof valve according to Example 2 Longitudinal sectional view of a fireproof valve according to Example 2 BB sectional view of the main part in FIG. Longitudinal sectional view of a fireproof valve according to Example 3 Longitudinal sectional view of a fireproof valve according to Example 3 The enlarged view of the principal part in FIG.

Explanation of symbols

3 Valve box 5 Valve body 5b Spherical outer peripheral surface of valve body 8, 10 Elastic seal member 12, 15 Recess groove 13, 16 Thermal expansion member L Fluid flow path

Claims (5)

A valve body is accommodated in the valve box so as to be rotatable. By rotating the valve body to the valve closing side, the outer peripheral surface of the valve body is attached to an elastic seal member provided in the valve box. When the elastic seal member is heated in the closed state, the thermal expansion member disposed in the valve box is thermally expanded to urgently seal the fluid flow path A refractory valve configured to:
The fire-resistant valve, wherein the thermal expansion member itself has a thermal expansion directionality, and is arranged so that the thermal expansion direction faces the emergency sealing direction.   The fireproof valve according to claim 1, wherein the thermal expansion member is disposed in a recessed groove that opens in the emergency sealing direction.   The fireproof valve according to claim 2, wherein the recessed groove is formed in the valve box so as to be integrated with the valve box.   The thermal expansion member is configured in an annular shape and disposed on the outer peripheral portion of the valve body and thermally expands in the diameter reducing direction, and contacts the spherical outer peripheral portion of the valve main body to urgently seal the fluid flow path. The fireproof valve according to any one of claims 1 to 3, wherein the fireproof valve is configured to stop.   The refractory valve according to claim 4, wherein a pair of the thermal expansion members are disposed on the upstream side and the downstream side of the fluid flow path in the outer peripheral portion of the valve body.

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