JP2004125057A - Passage disconnecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passage disconnecting device for disconnecting a gas passage at the time of abnormal overheat which can be easily installed into an existing gas passage, and which reduces pressure loss of gas after installation. <P>SOLUTION: This passage disconnecting device is composed of a thermal expansion member 10 inserted into a tube member 1 composing the gas passage to be expanded by heat over a set temperature to disconnect the gas passage, and a pressure-welding member 3 to pressure-weld the thermal expansion member 10 with an inner wall of the tube member 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flow path cutoff device, and more particularly to a flow path cutoff device that automatically cuts off a gas flow path when a set temperature is reached when a fire occurs.
[0002]
[Prior art]
As shown in FIG. 6, an annular groove (21) is formed in the upstream or downstream flow path of the gas cock (20) along the circumferential direction as a flow path blocking device using a thermal expansion member, and the annular groove is formed. (21) a thermal expansion member (10) formed in a cylindrical shape having a thickness substantially matching the depth of the annular groove (21) and a height substantially matching the width of the annular groove (21); There is one in which a part of the flow path is constituted by a thermal expansion member (10) by being closely fitted. (See Patent Document 1)
As shown in FIG. 7, there is also a configuration in which the thermal expansion member (10) formed in a tubular shape or another shape is simply accommodated in a pipe (1). (See Patent Document 2)
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 57-38969 [Patent Document 2]
JP 2001-252366 A
[Problems to be solved by the invention]
In the former, since the thermal expansion member (10) is configured to be embedded in the pipe member constituting the flow path in such a manner that its inner wall forms the same plane as the inner wall of the flow path, the flow path is The configuration is the same as that of the flow path of a normal gas pipe without the thermal expansion member (10), and there is no pressure loss of the gas flowing in the flow path.
[0005]
However, in this case, in order to incorporate the thermal expansion member (10) so as to be integral with the inner peripheral wall of the tube member, an annular groove (21) must be formed in the tube member. Therefore, in order to provide the shutoff device in the flow path, the existing pipe must be replaced with the pipe having the annular groove (21).
[0006]
On the other hand, in the case of the latter, since only the thermal expansion member (10) is provided in the pipe (1), there is no need to replace the entire pipe as in the former, and the existing pipe is connected to the flow path. It can be easily changed to piping with a shutoff device. However, since the thermal expansion member (10) is not fixed in the pipe (1), there is a problem that the thermal expansion member (10) is inadvertently moved or displaced. , The pressure loss of the gas increases.
[0007]
The present invention provides a “flow path shut-off device that shuts off a gas flow path when abnormally overheated”, which makes it possible to easily attach the flow path cut-off device to an existing gas flow path and reduces the pressure loss of gas in the flow path. The task is to be able to reduce it.
[0008]
[Means for Solving the Problems]
* 1. The technical means of the present invention for solving the above-mentioned problem is as follows: "The thermal expansion that is inserted into the pipe member constituting the gas flow path and expands with heat above a set temperature to shut off the gas flow path. And a pressing member for pressing the thermal expansion member against the inner wall of the tube member. "
[0009]
The above technical means works as follows.
The thermal expansion member is accommodated in the pipe member, and is pressed against the inner wall of the pipe member by the press-contact member, whereby the thermal expansion member can be fixed at a predetermined position in the pipe member. Further, the thermal expansion member is compressed in the radial direction of the pipe member by being pressed by the pressure contact member, and comes into close contact with the inner wall of the pipe member. Therefore, a sufficient flow path can be secured in the pipe member. When the pipe is heated to a set temperature or more due to a fire or the like, the thermal expansion member expands in the pipe. However, since the pressing member presses the thermal expansion member, the thermal expansion member is a pipe member. Will rapidly expand against external heat.
[0010]
* In the item 2, the "contact member is an elastic ring body which can be expanded and contracted in the radial direction". In the case where the thermal expansion material is accommodated in the tube member, the contact member is elastically deformed in the radial direction. Inserted into the pipe member. The elastic ring body is elastically restored in the tubular body, so that the thermal expansion material is pressed against the inner wall of the pipe member.
[0011]
* 3. In the item 2, the "contact member is a band-shaped body having a window hole formed in a peripheral wall". In the case where the pressure-contact member is a band having a predetermined width, the peripheral wall has the thermal expansion member. Is pressed against the inner wall of the pipe member. Since the surrounding wall has a configuration in which a window hole is penetrated, when the tube member is overheated, the thermal expansion member protrudes from the window hole to the inside of the tube member, and a flow path of the tube member. Can be shut off.
[0012]
* 4 In each of the above-mentioned items, in the case where the holding member for the thermal expansion member is provided in the pressure contact member, the thermal expansion member can be inserted into the pipe member in a state where the thermal expansion member is assembled to the pressure contact member in advance. . Since the thermal expansion member is held in the pressing member by the holding portion so as not to come off, there is no inconvenience when the two members are inserted into the tube member.
[0013]
* 5. In each of the above-mentioned items, the term "the thermal expansion member is a tubular body having an outer diameter substantially matching the inner diameter of the tube member and having a slit formed along the axial direction" By reducing the diameter of the tubular body using the above, the thermal expansion member can be easily inserted into the pipe member, and after insertion, substantially the entire outer peripheral surface thereof is pressed against the inner wall of the pipe member. Can be.
[0014]
【The invention's effect】
The present invention has the following specific effects because of the above configuration.
Since only the thermal expansion member and the pressure contact member are accommodated in the pipe member, the flow path cutoff device made of the thermal expansion member can be easily incorporated into the existing pipe or the like. It can be easily changed to the one with. Since the thermal expansion member is fixed by the pressure contact member, there is no inconvenience that the thermal expansion member moves or shifts in the tube member carelessly and hinders the gas flow path. In addition, since the thermal expansion member is attached to the inner wall of the pipe member in a state of being compressed by the pressure contact member, the flow path is compared with the conventional structure in which the thermal expansion member is not pressed. Can be set large, and the pressure loss of gas in the flow path can be reduced.
[0015]
In the item (2), in addition to the above effect, there is an effect that the press-contact member is easily attached, and in the item (3), there is an effect that the thermal expansion member can be securely held in the pipe member.
[0016]
In the fourth aspect, since the press-contact member and the thermal expansion member can be simultaneously inserted into the tube member without being shifted from each other, the insertion into the tube member is further facilitated.
[0017]
In the fifth aspect, the thermal expansion member is easily accommodated in the pipe member, and the thermal expansion member comes into contact with substantially the entire inner wall of the pipe member. The time until the road is interrupted can be shortened.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a flow path blocking device according to an embodiment of the present invention includes a tubular packing (2) having a heat-resistant expansion member configured in a tubular shape, and a pipe (1) connected to the tubular packing (2). And (3) a pressure contact frame (3) in which an elastic frame is formed in a substantially C-shape in order to press against the inner wall.
[0019]
The cylindrical packing (2) has an outer diameter substantially matching the inner diameter of the gas pipe (1), and has one slit (23) formed in the axial direction, and has a substantially C-shaped cross section. Formed in the body.
[0020]
As shown in FIG. 2, the pressure contact frame (3) is formed by bending an elastic frame body having a plurality of window holes (30) into a substantially C-shape to have a cylindrical shape, and has a length in the axial direction. The height is set so as to substantially correspond to the height of the cylindrical packing (2), and a plurality of holding pieces (33) are protruded outward from both open ends.
[0021]
In order to equip the pipe (1) with a flow path cut-off device composed of the cylindrical packing (2) and the pressure contact frame (3), first, the pressure contact frame (3) is compressed into the cylindrical packing (2). It is inserted while being elastically deformed in the radial direction, and is overlapped in such a manner that both open ends substantially coincide with each other. Accordingly, the holding pieces (33) project from both sides in the axial direction of the cylindrical packing (2). Therefore, as shown in FIG. 3, the holding piece (33) is bent outward at a right angle. As a result, the tubular packing (2) is integrated with the pressure contact body (3).
[0022]
The combined body of the cylindrical packing (2) and the pressure contact body (3) is pushed into the pipe (1) and is disposed at a predetermined position. At this time, since the tubular packing (2) and the pressure contact body (3) are both formed in a substantially C-shaped cross section, both can be expanded and contracted in the radial direction. (1) It can be inserted in.
[0023]
Further, since the cylindrical packing (2) is held in a state of being prevented from falling off by the press-contact body (3) by the holding piece (33), when the tubular packing (2) is inserted into the pipe (1), it is mutually connected. There is no shift.
[0024]
The joined body of the cylindrical packing (2) and the pressure contact frame (3) is inserted while being elastically deformed, and then is elastically restored in the pipe (1), so that the cylindrical packing (2) is connected to the pressure contact frame. By (3), the pipe is pressed against the inner wall of the pipe (1). In this way, the tubular packing (2) is reliably held at a predetermined position in the pipe (1) in a stable state by the elastic restoring force of the press contact frame (3), and may be inadvertently moved or displaced during use. Or not.
[0025]
Further, since the tubular packing (2) is compressed by the lattice-like portion of the press-contact frame (3) and is brought into close contact with the inner wall of the pipe (1), compared with the case where the press-contact frame (3) is not provided. The wall thickness of the cylindrical packing (2) can be reduced, and the diameter of the flow path in the pipe (1) can be set larger accordingly. Therefore, the pressure loss of the gas flowing in the flow path can be reduced.
[0026]
When the temperature in the pipe (1) is overheated to a set temperature at which the tubular packing (2) starts to expand due to a fire or the like, the tubular packing (2) becomes as shown in FIG. Then, it expands so as to pass through the window hole (30) of the press contact frame (3) and advance into the press contact frame (3), and the flow path of the pipe (1) is shut off.
[0027]
FIG. 4 is an explanatory view of another embodiment of the present invention, in which two rod-shaped packings (22) are used as a thermal expansion material, and these two rod-shaped packings (22) are connected to a pipe ( The wire rod is fixed by a substantially C-shaped ring (31) formed by bending a wire into a deformed C-shape so as to be disposed along the axial direction at opposing positions on the inner wall in 1).
[0028]
The substantially C-shaped ring (31) has a shape in which a position facing a normal C-shaped ring is recessed in a substantially U-shape inside, and a rod-shaped packing (32) is provided in the U-shaped recess (32). It is assumed that the respective dimensional relationships are set to predetermined dimensions so that each of 22) is fitted.
[0029]
Further, as shown in FIG. 5, a plurality of C-shaped rings (4) are prepared as a press-contact body, and the packing members (2) made of a thermal expansion material formed into a cylindrical or rod shape are prepared by the C-shaped rings (4). ) (22) may be pressed from the inside. At this time, the packing members (2) and (22) may be arranged so that at least the vicinity of both ends is pressed against each other.
[0030]
The flow path blocking device according to each of the above-described embodiments can be easily provided in the middle of ordinary pipes, and can also be provided at various fitting members, gas cocks, gas meter inlet portions, and the like. Will expand the range of use.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view at room temperature showing an example in which a flow path cutoff device according to an embodiment of the present invention is used for a gas pipe.
FIG. 2 is a perspective view of a press-contact member employed in the flow path blocking device according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view at the time of abnormal overheating showing an example in which the flow path cutoff device according to the embodiment of the present invention is used for a gas pipe.
FIG. 4 is an explanatory diagram of a flow path blocking device according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view of a flow path blocking device according to another embodiment of the present invention.
FIG. 6 is an explanatory view of a gas cock provided with a conventional flow path blocking device.
FIG. 7 is an explanatory view of a pipe provided with a conventional flow path blocking device.
[Explanation of symbols]
(1) ······ Pipe member (piping)
(2) ······· Thermal expansion member (tubular packing)
(3) ······ Pressing member (pressing frame)

Claims (5)

In a flow path cutoff device that cuts off the gas flow path when abnormal overheating,
A thermal expansion member that is inserted into the pipe member forming the gas flow path and expands with heat of a set temperature or higher to block the gas flow path, and a pressure contact member that presses the thermal expansion member against the inner wall of the pipe member. A flow path blocking device, comprising: 2. The flow path blocking device according to claim 1, wherein the pressure contact member is an elastic ring body that can expand and contract in a radial direction. 3. 3. The flow path blocking device according to claim 2, wherein the pressure contact member is a band-shaped body having a window formed in a peripheral wall. 4. 4. The flow path blocking device according to claim 1, wherein the pressing member is provided with a holding portion for a thermal expansion member. 5. 5. The flow path blocking device according to claim 1, wherein the thermal expansion member has an outer diameter substantially matching an inner diameter of the pipe member, and has a slit formed along an axial direction. A flow path blocking device having a cylindrical body.

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