JP4478511B2 - Gas shut-off device - Google Patents

Description

  The present invention relates to a gas shut-off device that can shut off gas urgently in the event of a fire or the like.

  Examples of this type of gas shut-off device include those described in Patent Documents 1 and 2 below. The gas shut-off device described in Patent Document 1 includes a ball valve disposed in a gas passage formed inside the device body, and the ball valve is biased toward the valve seat by a coil spring, and is made of a low melting point metal. The holding member is held at a predetermined open position separated from the valve seat. When the holding member melts due to high heat during a fire, the ball valve is seated on the valve seat by the coil spring. Thereby, a gas passage is interrupted | blocked. On the other hand, the gas shut-off device described in Patent Document 2 forms a valve accommodating chamber facing the gas passage on one side of the apparatus main body, accommodates a ball valve in the valve accommodating chamber, and includes a gas passage, a valve accommodating chamber, A support plate made of a low melting point metal is provided between them, and the ball valve is held in the valve storage chamber by this support plate. When the support plate melts due to high heat during a fire, the ball valve Enter the gas passage from the valve storage chamber. The ball valve is seated on the valve seat by its own weight or the pressure of the gas flowing in the gas passage. Thereby, a gas passage is interrupted | blocked.

Japanese Utility Model Publication No. 51-134238 JP 2000-2354 A

  In the gas shut-off device described in Patent Literature 1, since the ball valve is disposed in the gas passage, the ball valve inhibits the smooth flow of gas in the gas passage. As a result, there is a problem that pressure loss increases. On the other hand, in the one described in Patent Document 1, the ball valve is seated on the valve seat by its own weight or the pressure of gas, so when using the gas shut-off device, the valve seat is located below the ball valve. Therefore, the attitude of the gas shut-off device is limited. As a result, there is a problem that the use range in which the gas shut-off device can be used is narrowed.

In order to solve the above-described problem, the present invention provides a device main body in which a gas passage penetrating the inside is formed, and a valve housing chamber that is opened at one side of the gas passage is provided. A valve body housed in the valve housing chamber so as to be movable in a direction from one side portion of the gas passage toward the other side portion, and this valve body is urged in a direction from the one side portion of the gas passage toward the other side portion. And a holding member provided between the apparatus main body and the valve body, the holding member resists the biasing force of the biasing means when the holding member is below a predetermined temperature. The valve body is held in a predetermined open position stored in the storage chamber, and the valve body is moved from the open position toward the other side of the gas passage by the urging force of the urging means above a predetermined temperature. is configured to allow the movement to the predetermined closed position for blocking the passage, The valve body is formed in a tapered shape so as to have a smaller diameter toward the front side in the moving direction, and is tapered inside the apparatus main body so as to have a smaller diameter from one side of the gas passage toward the other side. The valve seat hole is formed so that its axis is substantially coincident with the axis of the valve body, and the valve seat hole crosses the gas passage so as to divide the gas passage into an upstream portion and a downstream portion. The large-diameter side end of the valve seat hole is formed in an opening facing the gas passage of the valve storage chamber, and the small-diameter side end of the valve seat hole is formed on the inner surface of the other side of the gas passage. And the valve body is configured to close the gas passage by fitting from the large-diameter side end portion to the small-diameter side end portion of the valve seat hole when positioned in the closed position, An upstream portion of the gas passage communicates with the valve housing chamber on the inner peripheral surface of the large-diameter end of the hole. A first communication portion is formed, and an inner peripheral surface of the end portion on the small diameter side of the valve seat hole is defined by an end surface on the small diameter side of the valve body and a bottom surface of the valve seat hole. A second communication portion that connects the inside of the small-diameter side end portion and the downstream portion of the gas passage is formed .
In this case, the holding member is annularly provided at the large-diameter side end of the valve seat hole, and the small-diameter side end of the valve body accommodated in the valve accommodating chamber is fitted into the holding member. Therefore, it is desirable that the valve body is held in the open position .

  According to the present invention having the above-described characteristic configuration, since the valve element is accommodated in the valve accommodating chamber during normal use, the valve element does not hinder the smooth flow of gas in the gas passage. Therefore, no pressure loss is caused by the valve body. When the holding member is heated to a predetermined temperature or more in a fire or the like, the valve body moves from the open position to the closed position, and the gas passage is blocked. At this time, since the valve body is moved by the biasing means, the gas shut-off device can be used in any posture. Therefore, the use range of the gas shut-off device can be widened.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 and 2 show a first embodiment of a gas shut-off device according to the present invention. FIG. 1 shows a state when the valve body is located at an open position, and FIG. The state when it is in the closed position is shown. As shown in these drawings, the gas shut-off device 1 includes a device main body 2 and a valve body 3.

  A gas passage 21 penetrating from one end surface to the other end surface is formed inside the apparatus main body 2. Tapered female screw portions to which a primary side and a secondary side gas pipe (not shown) are respectively connected to one end opening (upstream side opening) and the other end opening (downstream side opening) of the gas passage 21. 21a and 21b are formed. A hole 22 extending from the outer surface of the device main body 2 to the inner surface of one side portion of the gas passage 21 is formed in the central portion of the device main body 2 in the longitudinal direction of the gas passage 21. The hole 22 is arranged so that its axis is substantially orthogonal to the axis of the gas passage 21. On the outer surface of the main body 2, an annular protrusion 23 surrounding the opening outside the hole 22 is formed. The lid 4 is screwed and fixed to the annular protrusion 23. Accordingly, the hole 22 is blocked from the outside, and the valve accommodating chamber 5 is formed by the internal space of the hole 22 and the internal space of the lid body 4.

  A valve seat hole 24 whose axis is aligned with the axis of the hole 22 is formed inside the apparatus body 2. The valve seat hole 24 includes a tapered hole portion 25 formed by aligning the axes of each other and a straight hole portion 26 having a short length. The tapered hole portion 25 has a large diameter on the side of the hole 22 and a smaller diameter as the distance from the hole 22 increases. The large-diameter end 25 a of the tapered hole 25 is formed in the opening on the gas passage 21 side on the inner peripheral surface of the hole 22. Accordingly, the large-diameter side end portion 25 a of the tapered hole portion 25 communicates with the valve accommodating chamber 5. The tapered hole portion 25 crosses the gas passage 21 and reaches the inner surface of the other side portion of the gas passage 21 (the side portion opposite to the side portion where the hole 22 is formed). A small diameter side end portion 25b of the portion 25 is formed. The inner diameter of the intermediate portion across the gas passage 21 of the tapered hole portion 25 is larger than the inner diameter of the gas passage 21 at any location in the axial direction. As a result, the gas passage 21 is divided into an upstream / downstream portion 21c and a downstream portion 21d by the tapered hole 25, and the gas passage 21 is formed between one inner surface of the tapered hole 25 and the inner surface of the other side portion. The upstream / downstream part 21c and the downstream part 21d are opened. Therefore, when the taper hole 25 is blocked, the upstream / downstream portion 21c and the downstream portion 21d of the gas passage 21 are blocked. The straight hole portion 26 is slightly larger in diameter than the inner diameter of the small diameter side end portion 25b of the tapered hole portion 25. About the straight hole part 26, the small diameter side edge part 25b of the taper hole part 25 may be extended, and it may be replaced with the straight hole part 26.

  A valve element 3 is accommodated in the valve accommodating chamber 5. The valve body 3 has a tapered shape, and the outer peripheral surface thereof is formed by a tapered surface having the same taper angle as the tapered hole portion 25. The valve body 3 is accommodated in the valve accommodating chamber 5 in a state where the axis of the valve body 3 is aligned with the axis of the tapered hole portion 25 and the small-diameter side end is directed to the gas passage 21 side. And the valve body 3 is arrange | positioned so that the movement to the axial direction is possible.

  The holding member 6 is fixed to the large diameter side end portion 25 a of the tapered hole portion 25 of the valve seat hole 24. The holding member 6 is, for example, a low melting point metal that melts when heated to about 90 to 150 ° C., a resin that melts or burns out when heated to 90 to 100 ° C., or deforms when heated to those temperatures. It is made of a shape memory alloy or the like. Of course, the holding member 6 may be one that melts, disappears or deforms at a temperature higher than this. In short, as will be described later, when the gas shut-off device 1 and thus the holding member 6 are heated to a predetermined high temperature due to a fire or the like, the holding member 6 allows the valve body 3 to move to the small diameter side. I just need it. The holding member 6 is formed in an annular shape, and is fitted and fixed to the large-diameter side end portion 25a. The holding member 6 may be formed into a plurality of thin block pieces without being formed in an annular shape, and each block piece may be arranged and fixed on the inner peripheral surface of the large-diameter side end portion 25a while being spaced apart from each other in the circumferential direction. A small diameter side end of the valve body 3 is fitted to the inner peripheral surface of the holding member 6. Thereby, the holding member 6 holds the valve body 3 so as not to move in the direction from the large diameter side to the small diameter side. The position of the valve body 3 at this time is an open position. In a state where the valve body 3 is located at the open position, the end surface on the small diameter side of the valve body 3 is substantially in contact with the inner peripheral surface of the gas passage 21 or is slightly separated from the outside.

  A coil spring (biasing means) 7 is provided between the valve body 3 and the lid body 4. The coil spring 7 is provided in a compressed state and biases the valve body 3 in a direction from the large diameter side toward the small diameter side. The valve body 3 is fitted and fixed to the holding member 6 by this urging force. Most of the one end side of the coil spring 7 is fitted in an accommodation hole 31 formed in the central portion of the large diameter side end face of the valve element 3. The inner diameter of the accommodation hole 31 is slightly larger than the outer diameter of the coil spring 7, but is set as small as possible within a range that does not hinder expansion and contraction of the coil spring 7. On the other hand, the other end of the coil spring 7 is fitted to the outer periphery of a protrusion 41 formed on the inner end face of the lid 4 facing the valve accommodating chamber 5. The outer diameter of the protrusion 41 is slightly smaller than the inner diameter of the coil spring 7, but is set as large as possible within a range that does not hinder the expansion and contraction of the coil spring 7. One end and the other end of the coil spring 7 are fitted into the receiving hole 31 and the protrusion 41, respectively, so that the coil spring 7 buckles when the valve body 3 is located at the open position. Is prevented. In addition, when the valve body 3 is located at the open position, most of the projecting portion 41 is accommodated in the accommodation hole 31, and coupled with the fact that the coil spring 7 is accommodated in the accommodation hole 31, The shut-off device 1 is downsized.

  When the holding member 6 is heated to a predetermined temperature or higher and melted, burned, or deformed (hereinafter simply referred to as melting), the valve body 3 is allowed to move from the larger diameter side to the smaller diameter side. As a result, the valve body 3 is moved to the small diameter side by the coil spring 7. At this time, since the coil spring 7 is fitted in the receiving hole 31 and the protruding portion 41, the valve body 3 is guided by the coil spring 7 and travels substantially straight. The valve element 3 that has moved to the small diameter side is stopped by fitting into the tapered hole 25. Of course, the small diameter side end portion, the intermediate portion, and the large diameter side end portion of the valve body 3 are fitted into the small diameter side end portion 25b, the intermediate portion, and the large diameter side end portion 25a of the tapered hole portion 25, respectively. The position of the valve body 3 at this time is a closed position. When the valve body 3 is located at the closed position, the valve body 3 blocks the upstream / downstream portion 21c and the downstream portion 21d of the gas passage 21.

  According to the gas shut-off device 1 configured as described above, when the valve body 3 is located at the open position, the entire valve body 3 is housed in the valve housing chamber 5, and the valve body 3 projects into the gas passage 21. There is nothing to do. Therefore, the gas flowing in the gas passage 21 is not hindered by the valve body from the smooth flow. Therefore, it is possible to prevent pressure loss from occurring. Moreover, since the valve body 3 is moved from the open position to the closed position by the coil spring 7, the posture when the gas shut-off device 1 is used can be set to an arbitrary posture. Therefore, the usable range of the gas cutoff device 1 can be expanded.

  3 to 6 show a second embodiment of the present invention. In the gas cutoff device 1 ′ of this embodiment, a first communication groove (first communication portion) 27 is formed on the side of the inner peripheral surface of the large-diameter side end portion 25a on the upstream portion 21c side. . The first communication groove 27 communicates the upstream / downstream portion 21 c of the gas passage 21 and the valve storage chamber 5. Therefore, the gas in the upstream / downstream portion 21 c is introduced into the valve storage chamber 5. On the other hand, a second communication groove (second communication portion) 28 is formed on the side portion on the downstream side portion 21d side of the inner peripheral surface of the small diameter side end portion 25b. As shown in FIG. 4, the second communication groove 28 is formed in the straight hole portion 26 (the end surface of the small diameter side of the valve body 3 and the valve seat hole 24) even when the valve body 3 is in the closed position. The inside of the small diameter side end of the valve seat hole 24 defined by the bottom surface) and the downstream portion 21d are in communication. Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  According to the gas cutoff device 1 ′ having the above configuration, the valve body 3 can be quickly seated in the tapered hole portion 25. That is, assuming that the second communication groove 28 is not formed, when the small diameter side end of the valve body 3 is fitted into the small diameter side end 25b of the tapered hole 25, the gas in the small diameter side end 25b Passes through between the inner peripheral surface of the small-diameter side end portion 25b and the outer peripheral surface of the valve body 3 and comes out. However, immediately before the valve body 3 is seated in the tapered hole portion 25, the gap between the inner peripheral surface of the small diameter side end portion 25b and the outer peripheral surface of the valve body 3 is very narrow, and the flow resistance is reduced. large. For this reason, the inside of the small diameter side end portion 25b becomes a high pressure, and the rapid seating of the valve body 3 in the tapered hole portion 25 is inhibited.

  In this respect, in the gas shutoff device 1 ′ of this embodiment, the straight hole portion 26 and the downstream portion 21 d communicate with each other via the second communication groove 28. When fitting into the small-diameter end 25b of the tapered hole 25, the gas in the small-diameter end 25b flows from the straight hole 26 through the second communication groove 28 to the downstream portion 21d. Therefore, the valve body 3 can be quickly seated in the tapered hole portion 25.

  Further, in a state where the valve body 3 is seated in the tapered hole portion 25, the gas that has flowed into the valve accommodating chamber 5 from the upstream portion 21 c through the first communication groove 27 reduces the diameter of the valve body 3 from its large diameter side. Push in the direction toward the side. With this pressing force, the valve body 3 can be reliably seated by the tapered hole portion 25.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above-described embodiment, the valve body 3 is formed in a tapered shape, but may be formed in a straight cylindrical shape.
In the above-described embodiment, the first and second communication grooves 27 and 28 are formed as the first and second communication portions. Instead, the first and second communication holes are formed. Also good.

It is sectional drawing which shows 1st Embodiment of the gas cutoff device which concerns on this invention in the state in which the valve body is located in an open position. It is sectional drawing which shows the same embodiment in the state in which the valve body is located in a closed position. It is sectional drawing which shows 2nd Embodiment of the gas cutoff device which concerns on this invention in the state in which the valve body is located in an open position. It is sectional drawing which shows the same embodiment in the state in which the valve body is located in a closed position. It is sectional drawing which follows the XX line of FIG. It is sectional drawing which follows the YY line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas shut-off device 1 'Gas shut-off device 2 Device main body 3 Valve body 5 Valve accommodating chamber 6 Holding member 7 Coil spring (biasing means)
21 Gas passage 21c Upstream part 21d Downstream part 24 Valve seat hole 25 Tapered hole 25a Large diameter side end 25b Small diameter side end 27 First communication groove (first communication part)
28 Second communication groove (second communication part)

Claims (2)

An apparatus main body in which a gas passage penetrating the inside is formed and a valve accommodating chamber opened at one side portion of the gas passage is provided, and the valve accommodating chamber of the apparatus main body is provided from one side portion of the gas passage to the other. A valve body housed so as to be movable in a direction toward the side portion, biasing means for biasing the valve body in a direction from one side portion of the gas passage toward the other side portion, the device body, and the valve body A holding member provided between the holding member and the holding member at a predetermined open position in which the valve body is accommodated in the accommodation chamber against a biasing force of the biasing means at a predetermined temperature or lower. The valve body is moved from the open position toward the other side of the gas passage to a predetermined closed position that blocks the gas passage by the biasing force of the biasing means at a predetermined temperature or higher. Configured to allow ,
The valve body is formed in a taper shape so as to have a small diameter toward the front side in the moving direction, and a taper having a small diameter from the one side portion side of the gas passage toward the other side portion inside the apparatus main body. The valve seat hole is formed so that its axis is substantially coincident with the axis of the valve body, and the valve seat hole crosses the gas passage so as to divide the gas passage into an upstream portion and a downstream portion. The large-diameter side end of the valve seat hole is formed in an opening facing the gas passage of the valve storage chamber, and the small-diameter side end of the valve seat hole is formed on the inner surface of the other side of the gas passage. The valve body is configured to shut off the gas passage by fitting from the large-diameter side end of the valve seat hole to the small-diameter side end when positioned in the closed position,
A first communicating portion that communicates the upstream portion of the gas passage and the valve accommodating chamber is formed on the inner peripheral surface of the large-diameter end of the valve seat hole, and the small-diameter end of the valve seat hole The inner peripheral surface of the valve body communicates with the inside of the small diameter side end of the valve seat hole defined by the small diameter end surface of the valve body and the bottom surface of the valve seat hole and the downstream portion of the gas passage. A gas shut-off device, wherein a second communication portion is formed . The holding member is provided in an annular shape at the large-diameter side end of the valve seat hole, and the small-diameter side end of the valve body accommodated in the valve accommodating chamber is fitted into the holding member. The gas shut-off device according to claim 1, wherein the valve body is held in the open position .

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