JP2004052824A - Passage shutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passage shutting device to shut a gas passage 10 in the event of abnormal overheating, capable of being embodied in a simple structure and assuring a less pressure loss. <P>SOLUTION: The passage shutting device is composed of a plate-form valve 2 having such a size and shape as capable of shutting the gas passage 10, an energizing means 3 to energize at all times the plate-form valve 2 in the direction of shutting the passage, and a holding member 1 capable of holding the valve 2 in the passage opened condition in which the stem of the valve 2 is rotated approximately 90 degs. with respect to the passage direction of the valve 2 against the energizing force of the means 3, wherein the holding member 1 is formed from a material capable of thermal deformation. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flow path blocking device, and more particularly to a flow path blocking device that can immediately block a gas flow path when a fire occurs.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2000-2354 discloses an example in which a flow path cutoff device as an emergency cutoff device is incorporated in a gas flow path.
[0003]
In this apparatus, a ball valve is adopted as a flow path shutoff valve, and a valve housing chamber for housing the ball valve is arranged in parallel so as to communicate with a gas flow path. At normal temperature, the ball valve is supported by the support in a state where escape from the valve storage chamber to the flow path is prevented. When the force is lost, the ball valve is inserted into the flow path from the valve storage chamber, thereby shutting off the flow path.
[0004]
In this case, for example, if the support is made of a material having a property of melting or deforming by heating at a set temperature or more, such as a low melting point metal or a thermoplastic resin material, the support may be abnormally heated. Is melted or deformed, the ball valve can be injected into the gas flow path from the valve body housing chamber, and the flow path can be reliably closed. Therefore, it is possible to provide a safe gas flow path that can urgently shut off gas when a fire occurs.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional apparatus, since the valve housing chamber for housing the ball valve at room temperature is arranged in parallel with the pipe, the gas pipe for providing the flow path cutoff device must be separately manufactured. . Further, since the valve storage chamber is configured to be juxtaposed with the pipe, there is a problem that the entire pipe becomes bulky.
It is an object of the present invention to provide a flow path shut-off device having a simple structure and low pressure loss in a "flow path cut-off device for shutting off a gas flow path when abnormally overheated".
[0006]
[Means for Solving the Problems]
* 1. The technical means of the present invention for solving the above-mentioned problem is as follows: a plate-shaped valve formed in a shape capable of shutting off the gas flow path; Urging means for urging, and holding the plate-shaped valve in a flow path open state in which the valve shaft of the plate-shaped valve is rotated by about 90 degrees with respect to the flow path direction against the urging force of the urging means. And the holding member is made of a thermally deformable material. "
[0007]
The above technical means works as follows.
A flow path shut-off device is constituted by a plate-shaped valve as a shut-off valve, an urging means for urging the plate-shaped valve to a flow path cut-off state, and a holding member for holding the plate-shaped valve in a flow path open state. When the holding member is inserted and fixed at a predetermined position in the gas flow path, the installation of the flow path blocking device is completed. At normal temperature, the plate-shaped valve is set by the holding member so as to be maintained in the flow path open position by, for example, being positioned parallel to the flow path. It will flow smoothly from the upstream side to the downstream side. When the gas pipe is abnormally heated to a high temperature due to the occurrence of a fire or the like, since the holding member is made of a thermally deformable material, the holding member is melted or deformed and holds the plate-shaped valve. Retention is lost. When the holding force is lost, the plate-like valve is urged into the flow path cutoff state by the urging force of the urging means, and the gas is shut off on the upstream side of the upstream plate-shaped valve.
[0008]
* In the item 2 in item 1, “the holding member is provided so as to be in contact with the inner wall of the gas passage”, when the gas pipe is abnormally heated to a high temperature, the holding member is placed in contact with the gas pipe. Heat is also quickly conducted to the member.
[0009]
* 3. In the paragraphs 1 or 2, wherein the biasing means is a coil spring, and the plate-shaped valves are disposed at both ends of the coil spring in mutually opposing postures, and the coil spring is disposed at the center of the opposing surface. Are connected at both ends,
The plate-shaped valve is set in an open position in which the opposing surfaces face in the same direction by extending the coil spring, and the holding member holds the plate-shaped valve in the open position. In such a case, two plate-shaped valves are prepared, and the plate-shaped valves are opposed to each other in a state where the centers are connected one by one to both ends of the coil spring. When the posture of the plate-shaped valve is changed so that the opposed surface of each plate-shaped valve becomes the open posture in which the facing surface of each plate-shaped valve faces in the same direction from this opposed posture, the distance between the centers increases. It will be elastically deformed. As a result, an elastic return force acts between the plate-like valves in the open position. In this open position, the plate-shaped valve is held by the holding member, and when the holding member is melted or deformed due to abnormal overheating, the plate-shaped valve is returned to the facing position by the urging force of the coil spring. Become. As a result, the flow path is closed.
[0010]
* 4. In the above item 1 or 2, the item "the urging means is a coil spring, and one end of the coil spring is connected to the center of the plate-shaped valve and the other end is fixed in the flow passage. It is configured to be connected to the pin,
The plate-shaped valve is set to an open position in which the gas flow path is opened by extending the coil spring, and the holding member can hold the plate-shaped valve in the open position. The plate valve is provided only one so as to be connected to one of the coil springs, and the other end of the coil spring is locked by a locking pin fixed in the flow path. I have. By setting the plate-shaped valve in the open position, the urging means is elastically deformed in the extension direction with the locking pin as a base end, and in this state, the plate-shaped valve is held by a holding member. Become. When the holding member is melted or deformed due to abnormal overheating such as a fire, the plate-shaped valve is urged in a direction to shut off the flow path by the urging force of the urging means.
[0011]
In each of the above items, as shown in item 5, "the holding member is a tubular body fitted inside the gas flow path, and the plate-shaped valve is placed at the open end of the tubular body in the flow path open state. In such a configuration, the plate-like valve in a state where the flow path is opened to the urging force of the urging means is attached to both or one of the open portions of the cylindrical body, and the cylinder When the shape is inserted into a predetermined position of the gas pipe, the installation of the flow path blocking device is completed. Further, as shown in Item 6, "the holding member is a plate-like body having a width substantially corresponding to the inner diameter of the gas flow path, and the plate-like body is fitted in the flow path in an in-fit state. In this state, the plate-shaped valve is held in the flow path open state on both side surfaces in the flow direction of the plate-shaped body. ” Then, a plate-shaped valve may be attached to both or one of the upstream side surface and the downstream side surface.
[0012]
In each of the above-mentioned items, in the case where “the fixing means for fixing the holding member in the slip-prevention preventing state is provided in the gas flow path” shown in the paragraph 7, the state of being inserted into the flow path The holding member does not shift accidentally.
Further, as the holding member, as shown in item 8, "the holding member is made of a thermoplastic synthetic resin, a bimetal, a shape memory alloy, or a low melting point metal" can be adopted.
[0013]
* 9 As described in the above paragraph 1 or 2, "a pair of annular ribs are protruded at a predetermined interval in the gas flow path, and the holding member is sized to be fitted between the annular ribs. While being set, a pair of plate-like valves are respectively held at the room temperature in the channel open state on both sides in the flow direction of the holding member, and the holding member is abnormally overheated and the holding force of the holding member is increased. When the plate-shaped valve is lost, the urging force of the urging means is set so that the plate-shaped valve can be pressed against the outer surface of the annular rib respectively. Functions as a fixing means for fixing the valve so as not to be displaced in the direction of the flow path, and also functions as a valve sheet for shutting off gas by the plate-shaped valve being brought into close contact with the urging force of the urging means.
[0014]
【The invention's effect】
The present invention has the following specific effects because of the above configuration.
When the plate valve is held in the flow path open state, the valve shaft of the plate valve is rotated by about 90 degrees with respect to the flow direction of the gas flow path. Pressure loss at
Further, since the structure is simple, it can be installed in a gas pipe or a joint. At this time, the appearance of the gas pipes and the joints does not change, and the appearance is not impaired.
[0015]
In item 2, the external heat is easily transmitted to the holding member, and the pressure loss of the holding member is small.
[0016]
In the item (3), since the flow path is double-blocked by two plate-shaped valves, the emergency cutoff of the gas flow path is ensured. Further, since one of the plate-shaped valves is closed in a pressurized state, the flow path is reliably shut off at this point as well. Further, at the time of shutoff, no foreign matter adheres to the valve seat portion where the downstream plate-shaped valve is in close contact, so that the shutoff of the flow path is also ensured at this point.
[0017]
In addition, in the item (4), since one plate-shaped valve is used, there is an effect that an inexpensive and simpler channel cutoff device can be provided.
[0018]
In the fifth aspect, since the holding member is formed in a cylindrical shape to be fitted in the gas flow path, there is an effect that external heat is easily transmitted to the holding member, and the shutoff operation is quickly performed. In addition, when the holding member has a plate shape, the structure of the holding member can be further simplified, and the holding member can be used for a three-way joint.
[0019]
Further, in the case of the item 7, since the holding member mounted in the flow path is not inadvertently displaced, there is no need for maintenance.
[0020]
In the case of item 8, by specifying the material of the holding member, melting or deformation at the time of abnormal overheating can be ensured.
[0021]
Item 9 has effects similar to the effects described in item 1 above.
[0022]
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.
FIGS. 1 to 3 relate to the first embodiment, in which a holding cylinder (1) fitted inside a gas pipe (10) and open ends at both ends of the holding cylinder (1) are shown. And a coil spring (3) as an urging means for urging these plate-shaped valves (2) in the flow path blocking direction.
[0023]
The plate-shaped valve (2) is a metal disk having a diameter substantially corresponding to the inner diameter of the gas pipe (10), and an annular locking projection (20) is provided at the center of one surface of the disk. Are provided, and both ends of the coil spring (3) are locked to the locking projections (20), respectively.
[0024]
The holding cylinder (1) is entirely formed of a thermoplastic synthetic resin into a cylindrical shape having an outer diameter substantially matching the inner diameter of the gas pipe (10), and is provided at both open ends of the holding cylinder (1). At the opposing positions, as shown in FIG. 2, valve holding portions (11) each composed of a fork portion (11a) into which a part of the periphery of the plate-shaped valve (2) is fitted are protruded inward. . The distance between the fork portions (11a) is set to be substantially equal to the thickness of the plate-like valve (2).
[0025]
A pair of annular ribs (12) is provided at a predetermined position on the inner wall of the gas pipe (10) in which the holding cylinder (1) is fitted, at a distance corresponding to the height of the holding cylinder (1). It is assumed that the dimensional relationship is such that the holding cylinder (1) is just disposed between the annular ribs (12).
[0026]
In order to set the flow path cutoff device of this embodiment in the gas pipe (10), first, a plate-like member is placed between the fork portions (11a) of the valve holding portions (11) at both ends of the holding cylinder (1). As shown in FIG. 1, the valves (2) are inserted from both sides of the holding cylinder (1). Thereby, the plate valve (2) is held so as to be positioned parallel to the flow path. At this time, one end of the coil spring (3) is locked to the locking projection (20) of the one plate valve (2), and after the coil spring (3) is mounted on the holding cylinder (1), the coil spring (3) is extended. The other end of the coil spring (3) may be locked to the locking projection (20) of the other plate valve (2). In this manner, the holding cylinder (1) in which the plate-shaped valve (2) and the coil spring (3) are set is inserted into the gas pipe (10), and is forcibly moved so as to be located between the annular ribs (12). Insert. This completes the installation of the flow path blocking device of the present invention.
[0027]
In this state, the pair of plate-like valves (2) is configured to be urged by the coil spring (3) in a direction in which the pair of plate-like valves (2) is restored to a mutually opposed posture. Since the plate-like valve (2) is sandwiched between the valve holding portions (11) of the holding cylinder (1), as long as the holding cylinder (1) exists, the posture of the plate-like valve (2) is parallel to the flow path. Will be maintained. In other words, at normal temperature, the flow path of the gas pipe (10) is kept open and the pressure loss is small.
[0028]
When the gas pipe (10) is in an abnormally overheated state due to a fire or the like, the holding pipe (1) is formed in a tubular shape to be fitted in the gas pipe (10). The heat of 10) is immediately transmitted to the holding cylinder (1). Since the holding cylinder (1) is molded from a thermoplastic synthetic resin as described above, it is melted or deformed when it is heated to a predetermined temperature or higher. In particular, when the valve holding portion (11) is melted or deformed, the valve holding portion (11) cannot hold the plate-shaped valve (2) completely, and the holding force of the plate-shaped valve (2) of the valve holding portion (11). At the same time, the plate-shaped valve (2) returns to the mutually facing posture as shown in FIG. 3 by the urging force of the coil spring (3).
[0029]
The urging force of the coil spring (3) is such that the opposing surfaces of the plate-shaped valve (2), on which the locking projections (20) are formed, can be brought into close contact with the annular ribs (12). It is assumed that it is set to Accordingly, the gas pipe (10) is double-blocked by the plate-shaped valve (2) on both the upstream side and the downstream side of the annular rib (12).
[0030]
Further, since the plate-like valve (2) is formed of metal, the gas pipe (10) can be reliably kept shut without being melted or deformed by overheating.
[0031]
FIG. 4 is an explanatory view showing a use state of the flow path blocking device according to the second embodiment, in which a linear first pipe (31) and a second pipe (32) communicating at a right angle to the first pipe (31). ) Is performed on the three-way joint (33).
[0032]
The plate-shaped valve (2) of this embodiment is formed in the shape of a metal disk and has a coil spring (3) similarly to the plate-shaped valve (2) of the first embodiment described above. Are connected at both ends to each other. The holding member (13) for holding the plate-shaped valve (2) is formed of a thermoplastic resin in a plate shape having a width substantially matching the inner diameter of the pipe constituting the three-way joint (33). The pipe (31) and the second pipe (32) are fitted into and fixed to the first pipe (31) at a crossing point so as to be positioned parallel to the flow path of the first pipe (31). Shall be able to Since the width of the holding member (13) is as described above, the holding member (13) can be closely fitted along the inner diameter of the first pipe (31), but annular ribs (12) are formed on both sides of the fitted portion. If so, as shown in FIG. 5, the holding member (13) in the fitted state does not shift.
[0033]
Also, as shown in FIGS. 4 and 5, grooves (14) having a width substantially corresponding to the thickness of the plate-like valve (2) are opened on both sides of the holding member (13). The plate-shaped valve (2) is inserted into the groove (14) so that the plate-shaped valve (2) is pressed against the urging force of the coil spring (3), thereby holding the holding member (13). As in the case of (1), it is possible to maintain a posture parallel to the flow path of the first pipe (31).
[0034]
In this embodiment, when the holding member (13) is abnormally overheated due to a fire or the like, the holding member (13) fitted into the inner peripheral wall in a contact state is melted or deformed by the heat, Groove (14) is also lost. Thereby, the plate-like valve (2) is brought into the opposed posture by the elastic return force of the coil spring (3), and as shown by the two-dot chain line in FIG. 4, the plate-like valve (2) is placed on the annular ribs (12) on both sides of the holding member (13). Each will come into contact. Thus, the first pipe (31) of the holding member (13) is shut off on both sides of the second pipe (32), and the supply of gas can be stopped.
[0035]
FIG. 6 shows another example of the plate-shaped holding member (15), in which a locking projection (20) for connecting the coil spring (3) is provided at the center of one surface of the plate-shaped valve (2). At the same time, an annular locking projection (21) similar to the locking projection (20) is provided at the center of the other surface, and is inserted into the locking projection (21) on both side surfaces of the holding member (15). The locking shaft (16) to be protruded is provided. In this device, the holding member (15) and the locking shaft (16) are integrally formed of a heat-deformable material, and the holding member (15) is formed of a metal plate. (16) may be separately protruded.
[0036]
In this case, when an abnormally overheated state occurs, only the locking shaft (16) is deformed, and when the locking projection (21) comes off the locking shaft (16), the plate-like valve (2) becomes By the urging force of the coil spring (3), it is urged in the flow path blocking direction.
[0037]
In FIG. 7, one end of the coil spring (3) is connected to a locking projection (20) of the plate valve (2), and the other end is connected to a locking pin (22) separately provided in the gas pipe (10). It is configured to be connected.
[0038]
In this embodiment, only one plate-shaped valve (2) is provided, and the plate-shaped valve (2) may be held at the one end opening portion of the holding cylinder (1) as shown in the first embodiment. . The holding cylinder (1) is made of a thermoplastic resin and is installed between a pair of annular ribs (12) provided in the gas pipe (10), and the locking pin (22) is made of metal. At the same time, it is installed so as to be located outside one of the annular ribs (12).
[0039]
In this device, when the holding cylinder (1) is deformed due to abnormal overheating, the plate-like valve (2) is pulled toward the locking pin (22) by the urging force of the coil spring (3), and the other annular rib (12). ) In close contact. Thereby, the gas pipe (10) is shut off.
[0040]
In each of the embodiments, as a holding member for holding the plate-shaped valve (2) in the flow path open state, a portion holding the plate-shaped valve (2) when overheated to a set temperature or more is used. The material is not particularly limited as long as it is a material that dissolves or deforms, and a shape memory alloy, a low melting point metal, or the like can be used in addition to a thermoplastic resin and a bimetal. Further, only the portion holding the plate-shaped valve (2) may be made of the above-mentioned thermoplastic material.
In addition, it is desirable that the flow path cutoff device of the present invention be installed in a pipe upstream of the gas meter from the viewpoint of safety.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view at room temperature showing an example in which a flow path blocking device according to a first embodiment of the present invention is used in a gas flow path.
FIG. 2 is a perspective view of a holding member employed in the flow path blocking device according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a state of the channel shut-off device according to the first embodiment of the present invention at the time of abnormal overheating.
FIG. 4 is a cross-sectional view at room temperature showing an example in which a flow path blocking device according to a second embodiment of the present invention is used for a three-way joint.
FIG. 5 is a sectional view taken along line XX of FIG. 4;
FIG. 6 is a sectional view of a flow path blocking device according to a third embodiment of the present invention.
FIG. 7 is a sectional view of a flow path blocking device according to a fourth embodiment of the present invention.
[Explanation of symbols]
(1) ··· Holding member (10) ··· Gas pipe (2) ··· Plate valve (3) ··· Urging means

Claims (9)

In a flow path shut-off device for shutting off a gas flow path at the time of abnormal overheating, a plate-shaped valve formed in a shape capable of shutting off the gas flow path, and a valve for constantly biasing the plate-shaped valve in a flow path cut-off direction. Urging means, and a holding member capable of holding the plate-shaped valve in a flow path open state in which the valve shaft of the plate-shaped valve is rotated by about 90 degrees with respect to the flow direction against the urging force of the urging means. Consisting of
The holding member is made of a thermally deformable material. The flow path blocking device according to claim 1, wherein the holding member is provided so as to be in contact with an inner wall of the gas flow path. 3. The flow path blocking device according to claim 1, wherein the urging unit is a coil spring, and the plate-shaped valves are disposed at both ends of the coil spring in mutually opposite postures, respectively, and a center of the opposed surface is provided. 4. Are connected to both ends of the coil spring, respectively.
The plate-shaped valve is set in an open position in which the opposing surfaces face in the same direction by extending the coil spring, and the holding member holds the plate-shaped valve in the open position. A flow path blocking device that can be held. 3. The flow path blocking device according to claim 1, wherein the urging means is a coil spring, one end of the coil spring is connected to a center of the plate-shaped valve, and the other end is fixed in the flow path. It is configured to be connected to the locking pin,
The plate-shaped valve is set to an open position in which the gas flow path is opened by extending the coil spring, and the holding member can hold the plate-shaped valve in the open position. Flow path blocking device. 5. The flow path shut-off device according to claim 1, wherein the holding member is a cylindrical body fitted in the gas flow path, and the plate-shaped valve flows through an open end of the cylindrical body. 6. A flow path shut-off device that is kept in a road-open state. 5. The flow path blocking device according to claim 1, wherein the holding member is a plate having a width substantially corresponding to an inner diameter of the gas flow path, and the plate is placed in the flow path. 6. A flow path shut-off device having a configuration in which the plate-like valve is held in a flow path open state on both side surfaces in the flow direction of the plate-like body in a state of being fitted in the inner state. The flow path shut-off device according to any one of claims 1 to 6, wherein a fixing means for fixing the holding member in a slip-preventing state is provided in the gas flow path. The flow path blocking device according to any one of claims 1 to 7, wherein the holding member is made of a thermoplastic synthetic resin, a bimetal, a shape memory alloy, or a low melting point metal. The flow path blocking device according to claim 1 or 2,
A pair of annular ribs protrude from the gas flow path at a predetermined interval, and the holding member is set to have a size to be fitted between the annular ribs, and both sides in the flow direction of the holding member. The pair of plate-shaped valves are held in the flow path open state at room temperature, and when the holding member is abnormally overheated and the holding force of the holding member is lost, the plate-shaped valve is moved outside the annular rib. A flow path blocking device in which the urging force of the urging means is set such that the urging force can be pressed to the side surfaces in a close contact state.

Images