JP5422505B2 - Dry safety device - Google Patents

Description

  The present invention is a dry type which is installed between a gas supply source and a device using the gas when a flammable gas is used, and prevents the backflow / backfire of the gas to eliminate the influence on the supply source side. In particular, the present invention relates to a dry safety device that can be suitably used when the combustible gas is hydrogen gas.

  When a combustible gas such as acetylene gas is backflowed or backfired, a dry safety device is used to prevent an influence on the supply source side (see, for example, Patent Document 1). When in use, the shutoff valve mechanism is moved to the secondary side by the flow pressure of the gas flowing from the primary side (inlet side) to the secondary side (outlet side), and the flow path is opened to generate backflow / backfire. In this case, the shut-off valve mechanism is moved to the primary side by the reverse fire flow pressure so that the flow path can be closed. At this time, when a backfire occurs, such as acetylene gas, in the case of a gas in which the backfire impact pressure remains in the flow path, shut off using the pressure existing in the flow path. The valve mechanism is continuously moved to the closed position so that the flow path can be closed. However, the situation is different in the case of hydrogen gas. In other words, in the case of hydrogen gas, even if a backfire occurs, the backflow pressure acts instantaneously and disappears immediately, so keep moving the shut-off valve mechanism like a conventional safety device. I can't. Therefore, even if the conventional dry safety device is used as it is, the shut-off valve mechanism does not operate, so that backfire cannot be prevented.

  The inlet valve and outlet valve are elastically urged toward the inlet and outlet holes of the main body case, respectively, and a valve locking body containing a stopper that is pressed by the elastic body is connected to the gas outlet hole on the outlet valve side. There is also known a gas body backflow / backfire emergency automatic stop device which is attached to a main body case and positioned so as to be fitted in a recess provided at the tip of a stopper outside an outlet valve (see, for example, Patent Document 2). According to this device, the stopper is removed by the backflow pressure during backfire, and after that, the outlet valve is pushed by the projectile to move and close the outlet hole. It can also be used for flammable gases that disappear immediately after the countercurrent pressure acts on them. However, in this device, it is a closing member such as a rubber O-ring attached to the outlet valve that closes the outflow hole. Since it acts, it deteriorates with heat immediately and cannot close the outflow hole. In addition, the valve locking body provided with a stopper is configured so that a branch flow away from the original flow path of the gas acts, so the impact pressure does not act instantaneously, and in the case of hydrogen gas in the meantime There is a risk that the impact pressure will disappear, and there is no certainty. Furthermore, in order to return the safety device to the normal state after the reverse flow has subsided, remove the gas conduit to expose the outflow hole to the outside, insert a shaft rod, etc. from this outflow hole, and use the outlet valve at the tip of the shaft rod. Is required to be pushed back to the outflow hole side, and the stopper and the recess must be fitted together, so that the return measure is very troublesome.

Japanese Patent No. 3023842 (Claim 1, paragraphs 0013 and 0014, FIGS. 1 and 2) Japanese Patent Publication No. 59-3645 (Claims 3, column 12, line 13, column 6, line 40 to column 7, line 8, FIGS. 1 and 2)

  The problem to be solved by the present invention is that the flow path can be reliably shut off even with a flammable gas, such as the hydrogen gas, in which the backflow pressure acts instantaneously and disappears immediately during backflow and backfire. It is to provide a dry safety device that can easily perform a return operation after the reverse flow has subsided.

  According to the present invention, there is provided a shutoff valve mechanism for shutting off a flow path in the case of backfire flow in a main body having an inlet connected to the primary side at one end and an outlet connected to the secondary side at the other end. In the dry safety device provided with a reverse-fire extinguishing member located on the secondary side and extinguishing the flame of the reverse-fire flow, the shut-off valve mechanism is provided so as to be movable so as to close the inlet when moved to the primary side. A spindle shaft biased by a spindle spring toward the side is provided, and a spindle shaft formed on the secondary side of the spindle is inserted into a holed sleeve provided in the main body. A shut-off sleeve biased to the secondary side by a shut-off sleeve spring weaker than the spindle spring is movably mounted, and the secondary side of the shut-off sleeve communicates with an impact plate facing the outflow port, and the spindle shaft Slot with holes on the outer surface A locking groove into which a ball inserted into a hole provided in the hub enters is formed, and a pressing surface and a blocking sleeve for pushing the ball into the locking groove when the spindle moves to the secondary side are formed on the inner surface of the blocking sleeve. An open surface is formed to release the pressure of the ball when pressed to the primary side, and a reset ring is movably fitted to the outside of the main body, and the spindle and the reset ring are connected through a long groove formed in the main body. A dry safety device is provided, which solves the above-described problems.

  Further, according to the present invention, the outlet facing the impact plate is provided with a plunger urged so as to be movable toward the primary side so as to contact the impact plate and press the impact plate toward the primary side. The dry safety device is provided in which the plunger is temporarily held by the metal fuse in a state where the plunger is moved to the secondary side so as to release the holding of the plunger when the ambient temperature rises, and the above problem is solved.

  The present invention is configured as described above, and shuts off the flow path in the case of a backfire flow in a main body having an inlet that communicates with the primary side at one end and an outlet that communicates with the secondary side at the other end. In a dry safety device provided with a reverse-fire extinguishing member located on the secondary side and extinguishing the flame of the reverse-fire flow, the shut-off valve mechanism moves to close the inlet when moved to the primary side And a spindle shaft urged by a spindle spring toward the primary side. The spindle shaft formed on the secondary side of the spindle is inserted into a holed sleeve provided in the main body, and has a hole. On the outer periphery of the sleeve, a shut-off sleeve biased to the secondary side by a shut-off sleeve spring weaker than the spindle spring is movably mounted, and the secondary side of the shut-off sleeve communicates with an impact plate facing the outflow port. Outside of the spindle shaft Is formed with a locking groove into which a ball inserted into a hole provided in the holed sleeve is inserted, and a pressing surface that pushes the ball into the locking groove when the spindle moves to the secondary side on the inner surface of the blocking sleeve When the blocking sleeve is pushed to the primary side, an open surface is formed to release the ball, and a reset ring is movably fitted to the outside of the main body, and the spindle and reset through a long groove formed in the main body. Since the ring is connected, in use, when the reset ring is operated to move the spindle to the secondary side, the ball engages with the locking groove of the spindle shaft, and the ball is pressed by the pressing surface of the blocking sleeve. The spindle is held in a state of moving to the secondary side, and a flow path leading from the inlet to the outlet is opened to allow normal flow to flow.

  And when backfire / backflow occurs on the secondary side, the impact pressure instantaneously generated from the outlet toward the primary side acts directly on the impact plate, and this momentary pressure causes the impact plate to instantaneously move to the primary side. Since the blocking sleeve moves and the blocking sleeve moves at the same time, the open surface of the blocking sleeve corresponds to the ball, the pressure on the ball is released, and the ball comes out of the locking groove. Therefore, the ball comes off from the outer periphery of the spindle, and the spindle moves to the primary side by the action of the spindle spring, closes the outlet and prevents backfire / backflow. At this time, even in the case of a flammable gas such as hydrogen gas in which the impact pressure disappears instantaneously, it is not a configuration that uses the impact pressure that remains in the flow path as in the prior art. Since it is configured to operate by directly using the instantaneous impact pressure, it operates accurately without any trouble or delay. In addition, since a reverse fire extinguishing member is provided on the outlet side, there is no possibility that a closing member such as an O-ring provided on the spindle is damaged by the flame. In addition, after the reverse flow has subsided, if the reset ring is moved again to the secondary side, the spindle can be easily moved to the secondary side to return and can be reused. It is not necessary to remove the spindle and push the spindle with a bar or the like, and it is easy to handle.

  Also, if a plunger is provided on the outlet side facing the impact plate and temporarily held in a state where it is moved to the secondary side with a metal fuse, the metal will be heated when the ambient temperature rises due to a flame or the like. When the fuse melts, the temporary holding of the plunger is released in a timely manner, the plunger moves to the primary side, presses the impact plate, releases the restraint by the shut-off sleeve, and moves the spindle shaft to the primary side in the same manner as described above. And the inlet can be closed.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which showed one Example of this invention and crossed a part at the normal time. The half sectional view at the time of flashback. FIG. 3 is a partial cross-sectional view showing an embodiment having a plunger. Sectional drawing of the state which the plunger act | operated.

  FIG. 1 shows an embodiment of the present invention. A main body 1 has a flow path having an inlet 2 communicating with a primary side at one end and an outlet 3 communicating with a secondary side at the other end. In the embodiment shown in FIG. 1, the main body 1 has a central body 4 in which a valve seat 5 is formed in a primary opening, and an inflow port 2 screwed to the outside of the primary opening of the central body 4. It consists of a primary side main body 6 and a secondary side main body 7 screwed inwardly of the secondary side opening and having an outlet 3, and an O-ring is provided at a required location to seal the inside. The central body 4 is provided with a plurality of holes 9 into which the balls 8 are inserted, in the embodiment shown in the drawing, three holes 9 and a long groove 10, and a confirmation sleeve 11 is mounted on the outer periphery of the hole 9. The confirmation sleeve 11 is biased toward the secondary side by a confirmation sleeve spring 12 provided between the side body 6 and the side body 6. On the inner surface of the confirmation sleeve 11, a pressing surface 13 for pressing the ball 8 and an opening surface 14 for releasing the pressing are provided. The main body is provided with a backfire indication mark 15 that appears when the confirmation sleeve 11 moves to a position where the ball 8 is pressed. The backfire indication mark 15 is a position where the confirmation sleeve 11 releases the pressure of the ball 8. Is moved by the confirmation sleeve 11.

  A reverse fire extinguishing member for extinguishing the flame of the reverse fire flow is provided inside the secondary side main body 7 attached to the secondary side opening of the central body 4. The reverse flame extinguishing member includes a cylindrical flame extinguishing filter 16, and an inner filter receiver 18 and an outer filter receiver 19 are inserted from both ends of the flame extinguishing filter 16 through gaskets 17. The state where the primary side end of the outer filter receiver 19 is screwed to the end of the secondary side to sandwich the flame extinguishing filter 16, and the flange 20 of the inner filter receiver 18 is in contact with the inner step portion 21 of the central body 4. And fixed by the secondary body 7. The inner filter receiver 18 and the outer filter receiver 19 are respectively formed with a plurality of through holes 22 and 23 serving as gas flow paths, and the normal flow passes through the through holes 22 of the inner filter receiver 18 to extinguish the flame. It flows out from the inside of the filter 16 to the outside, flows out from the outlet 3 of the secondary side body 7 through the through hole 23 of the outer filter receiver 19. A partition plate 25 having a support hole 24 is formed inside the outer filter receiver 19.

  A shut-off valve mechanism is provided in the main body 1 for shutting off the flow path in the case of reverse fire flow. The shut-off valve mechanism includes a spindle 26 and a check valve 27 built in the spindle 26 in the embodiment. The spindle 26 has a valve portion 28 provided with an O-ring that engages with the valve seat 5 of the main body on the primary side, and a plurality of through holes 29 that form flow paths on the outer periphery and the inner surface of the central main body 4. A locking groove 30 into which the ball 8 enters and an O-ring inscribed therein is provided. When the valve portion 28 moves to the primary side, the valve portion 28 abuts against the valve seat 5 of the main body and closes the inlet 2 toward the primary side. The spindle spring 31 is urged so as to be movable. The spindle spring 31 is interposed between a stopper 32 screwed to the secondary side opening of the spindle 26 and a spindle presser 33 screwed to the inner filter receiver 18. The fastener 32 and the spindle retainer 33 are respectively provided with through holes 34 and 35 that allow the gas to flow to the primary side and the secondary side.

  The check valve 27 is formed in a cylindrical body slidably contacting the inner surface of the spindle 26 and closed on the secondary side, and engages with a through hole 36 on the outer periphery and an inner valve seat 37 formed on the inner surface of the spindle 26. The ring has a ring and is biased to the primary side by a check valve spring 38 provided between the ring and the stopper 32.

  A spindle shaft 39 is inserted into the center portion of the fastener 32 of the spindle 26 and fixed with bolts 41 via a washer 40. The spindle shaft 39 extends in the axial direction, is inserted into a holed sleeve 42 screwed to the spindle retainer 33, and a locking groove 43 is formed on the outer periphery.

  The holed sleeve 42 has a plurality of holes 45 into which the balls 44 are inserted in the embodiment shown in the figure, and a blocking sleeve 46 is movably mounted on the outer periphery. The shut-off sleeve 46 is biased to the secondary side by a shut-off sleeve spring 48 weaker than the spindle spring 31 so that the shut-off sleeve 46 can move to the secondary side until the stepped portion on the inner surface comes into contact with the stop ring 47 attached to the holed sleeve 42. Yes. On the inner surface of the blocking sleeve 46, there are a pressing surface 49 for pushing the ball 44 when the spindle 26 moves to the secondary side, and an opening surface 50 for releasing the pressing of the ball 44 when the blocking sleeve 46 moves to the primary side. Is provided. Between the pressing surface 49 and the opening surface 50, the stepped portion that comes into contact with the stop ring 47 is provided.

  The secondary side of the blocking sleeve 46 communicates with an impact plate 51 that faces the outlet 3. In the embodiment shown in FIG. 1, the impact plate 51 has an outer diameter substantially inscribed in the inner surface of the outer filter receiver 19, and the impact plate is inserted into the support hole 24 of the partition plate 25 of the outer filter receiver 19. It is screwed to the shaft 52 and fixed with a nut 53. The impact plate shaft 52 is urged by an impact plate spring 55 toward the secondary side so that the stepped portion 54 provided on the outer periphery can move until it contacts the partition plate 25, and an O-ring is provided on the outer periphery. . The impact leaf spring 55 acts in the same direction as the blocking sleeve spring 48 and may be omitted. A sleeve pressing plate 56 is screwed to the primary side of the impact plate shaft 52, and the sleeve pressing plate 56 is configured to abut against the end surface of the blocking sleeve 46 in a normal state. It is also possible to connect the blocking sleeve 46 and the sleeve pressing plate 56 so that the impact plate 51 and the blocking sleeve 46 are integrally connected. In this case, the blocking sleeve spring may be arranged at the position of the impact leaf spring. A cylindrical holder 57 is provided at the outlet 3 facing the impact plate 51. As described above, the dry safety device of the present invention has the inlet, the spindle, the check valve, the spindle shaft, the shut-off sleeve, the impact plate shaft, the impact plate, the outlet, and the like provided concentrically on a straight line. As will be described later, since the backflow pressure from the outlet directly and directly acts on the impact plate, the operation is reliable.

  A reset ring 58 is movably fitted on the outer periphery of the main body 1 and is connected to the spindle 26 by a connecting shaft 59 that passes through the long groove 10 formed in the central main body 4. Therefore, the reset ring 58 moves together with the spindle 26, and the spindle 26 can be moved by the reset ring 58 when the movement of the spindle 26 is not restricted. The main body is provided with a normal indication mark 60 so that it appears when the reset ring 58 moves to the secondary side. This mark is displayed when the reset ring 58 and the spindle 26 move to the primary side during flashback. It is hidden by the reset ring 58.

  With the above configuration, as shown in FIG. 1, when the spindle 26 is moved to the secondary side by the reset ring 58 in the normal state, the blocking sleeve 46 is engaged with the ball 44 engaged with the locking groove 43 of the spindle shaft 39. Since the pressing surface 49 presses the ball 44, the ball 44 is prevented from coming off, and the spindle 26 can be held in a state of moving to the secondary side. Therefore, the gas that has entered the inlet 2 from the primary side enters the inside of the spindle 26, and the check valve 27 is moved to the secondary side by the flow pressure, so that the check valve 27, the stopper 32, and the spindle retainer 33 are moved. From the inside of the passage inner filter receiver 18 through the inner surface of the flame-extinguishing filter 16 to the outer surface of the filter 16, passes through the through hole 23 of the outer filter receiver 19, passes between the impact plate 51 and the holder 57, and passes through the outlet 3. It flows out to the next side. At this time, a normal display mark 60 appears.

  When backflow occurs, the check valve 27 moves to the primary side and closes the flow path. Further, when backfire occurs, the initial impact pressure directly acts on the impact plate 51, the impact plate 51 instantaneously moves to the secondary side, and the sleeve presser 56 moves the blocking sleeve 46 to the secondary side. To release the pressure of the ball 44. As a result, since the spindle shaft 39 is not restrained, the spindle 26 is moved to the primary side by the spindle spring 31, and the valve portion 28 engages with the valve seat 5 of the main body to close the inflow port 2 and to the primary side. The influence can be prevented (see FIG. 2). In this flashback state, the flame is extinguished by the flame extinguishing filter 16, so that the flame does not reach the valve portion 28 of the spindle 26 or the valve seat 5 portion of the main body, and the O-ring can be protected. Further, as shown in FIG. 2, in this state, the confirmation sleeve 11 presses the ball 8 and holds the spindle 26 on the primary side, and the reset ring 58 moves to the secondary side and the flashback display mark 15 appears. ing. At this time, even if the impact pressure is instantaneous, by moving the shut-off sleeve 46 for a moment and thereafter functions as described above without using the impact pressure, the impact plate 51 and the shut-off sleeve 46 are used. However, there is no problem even if the springs 48 and 55 return to the primary side by the action of the respective springs 48 and 55.

  When the flashback has subsided, the reset ring 58 is moved to the secondary side while moving the confirmation sleeve 11 to the primary side. As a result, the spindle 26 moves to the secondary side, and the normal flow can be made to flow again by setting the spindle 26 in a state of moving to the secondary side as shown in FIG.

  4 and 5 show an embodiment in which the flow path can be closed even when the temperature around the dry safety device rises. In this case, as shown in FIG. 4, a plunger 62 is inserted into the inside of a holder 61 screwed to the outlet, and the plunger 62 is urged by a plunger spring 63 so as to be movable toward the impact plate 51. Keep it. Then, the plunger 62 and the holder 61 are connected by a metal fuse 64 so as to temporarily hold the plunger 62 in a state of moving to the secondary side. In this manner, when the ambient temperature rises, the metal fuse 64 melts and the plunger 62 is released, so that the plunger 62 moves toward the impact plate 51 by the action of the plunger spring 63, Since the impact plate 51 is pressed against the impact plate, the flow path can be closed by moving the spindle 26 to the primary side in the same manner as described above.

  As described above, the dry safety device of the present invention can operate the spindle by using the instantaneous impact pressure when the gas is backfired, such as hydrogen gas that immediately loses the impact pressure. Although it can be used suitably for combustible gas, it is obvious that it can be used for ordinary acetylene gas, propane gas, methane gas and other combustible gases.

DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 10 Long groove 11 Confirmation sleeve 16 Flame extinguishing filter 26 Spindle 27 Check valve 31 Spindle spring 32 Stopping bracket 33 Spindle presser 39 Spindle shaft 42 Hole sleeve 46 Shut off sleeve 51 Impact plate 52 Impact plate shaft 56 Sleeve Presser foot 57 Holder 58 Reset ring 59 Connecting shaft 62 Plunger

Claims (7)

  Located on the secondary side with a shut-off valve mechanism that shuts off the flow path in the case of backfire flow in the body having an inlet that communicates with the primary side at one end and an outlet that communicates with the secondary side at the other end In the dry safety device provided with a reverse fire extinguishing member for extinguishing the flame of the reverse fire flow, the shut-off valve mechanism is movably provided to close the inlet when moved to the primary side, and the spindle spring toward the primary side The spindle shaft formed on the secondary side of the spindle is inserted into a holed sleeve provided in the main body, and the outer periphery of the holed sleeve is weaker than the spindle spring. A shut-off sleeve biased to the secondary side by a sleeve spring is movably mounted, and the secondary side of the shut-off sleeve communicates with an impact plate facing the outflow port, and a holed sleeve is formed on the outer surface of the spindle shaft. In the hole A locking groove into which the inserted ball enters is formed. On the inner surface of the blocking sleeve, when the spindle moves to the secondary side, the pressing surface for pressing the ball into the locking groove and the blocking sleeve are pressed to the primary side. When the ball is pressed, an open surface is formed, a reset ring is movably fitted to the outside of the main body, and the spindle and the reset ring are connected through a long groove formed in the main body. Safety device.   2. The dry safety device according to claim 1, wherein the spindle shaft is fixed to a stopper provided on a spindle, and the holed sleeve is fixed to a spindle presser provided in the main body.   3. The dry safety device according to claim 1, wherein the impact plate is attached to one end of an impact plate shaft, and a sleeve presser facing the blocking sleeve is provided at the other end of the impact plate shaft.   The reverse flame extinguishing member comprises an extinguishing filter and an inner filter holder and an outer filter holder for sandwiching the flame extinguishing filter, and a spindle presser holding a sleeve with a hole is fixed to the inner filter holder, 2. The dry type according to claim 1, wherein an impact plate shaft is supported on the filter receiver, the impact plate is attached to one end of the impact plate shaft, and a sleeve presser facing the blocking sleeve is provided at the other end. Safety device.   There is a holder and a plunger inserted into the holder at the outlet of the main body. The plunger is opposed to the impact plate and is urged by a plunger spring in the direction of the impact plate to move to the secondary side. The dry safety device according to any one of claims 1 to 4, wherein the plunger is temporarily held in a holder by a metal fuse at the position where it is placed.   The normal display mark that appears when the reset ring moves to the secondary side is provided on the main body, and the normal display mark is hidden by the reset ring when the reset ring moves to the primary side. The dry safety device according to any one of the above.   The main body is equipped with a confirmation sleeve, and the main body is provided with a backfire indication mark that appears when the confirmation sleeve moves to the secondary side. The backfire indication mark is displayed when the confirmation sleeve moves to the primary side. The dry safety device according to claim 1, wherein the dry safety device is concealed by a confirmation sleeve.

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