JP2008176693A - Pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress influence of primary pressure to pressure reducing actuation and control secondary pressure to the predetermined pressure and make a valve respond appropriately to the pressure variations, and to prolong the lifetime of the sealing material attached to the pressure reducing material. <P>SOLUTION: A valve seat (18) is formed in circumference of an exit path (11) that open in a pressure reducing valve chamber (10). In pressure reducing material (19), a sealing material (20) is arranged facing the valve seat (18). A piston material inside an operation chamber is linked with the pressure reducing material (19). A first sealing part (24) is arranged between the pressure reducing material (19) and the internal surface of the pressure reducing valve room (10), and a first seal area (S1) at a first seal part (24) is made wider than a valve seat seal area (S0). A gas injection path (25) is formed inside the pressure reducing material (19), and an entrance path (9) is communicated with a space in a valve chamber (A), between the first sealing part (24) and the valve seat (18). A second sealing part (26) is arranged, between a housing (5) and the pressure reducing material (19) at an upstream side further than the space inside the valve chamber (A). A second sealing area (S2) in the second seal part (26) is set substantially equal to the area difference between the first seal area (S1) and the valve seat seal area (S0). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure reducing valve, which can control the secondary pressure to a predetermined pressure by suppressing the influence of the primary pressure on the pressure reducing operation of the pressure reducing member, and can respond well to pressure fluctuations, and is provided on the pressure reducing member The present invention relates to a pressure reducing valve that can extend the service life of the valve.

  In a conventional pressure reducing valve, an outlet passage opening end that opens to the pressure reducing valve chamber is provided in order to prevent a seal member that is provided on the pressure reducing member and is brought into contact with and separated from the valve seat from being exposed to a jet of inflowing gas and wearing out early. There is a type in which a valve seat is formed around the valve member and the seal portion is provided on the pressure reducing member so as to face the valve seat (see, for example, Patent Document 1, hereinafter referred to as Prior Art 1).

  In this prior art 1, an inlet passage, a pressure reducing valve chamber, and an outlet passage are formed in order in a housing, and a valve seat is formed around the opening end of the outlet passage that opens to the pressure reducing valve chamber. . A pressure reducing member is inserted into the pressure reducing valve chamber so as to be movable back and forth with respect to the valve seat, and a seal member is provided on the pressure reducing member so as to face the valve seat. A working chamber is provided in the housing, and a piston member is slidably inserted into the working chamber. A pressure receiving chamber is formed on one side of the piston member. The pressure receiving chamber is communicated with the outlet passage, and the piston member is separated from the pressure reducing valve chamber by the gas pressure flowing into the pressure receiving chamber. While being pressed, this piston member is urged toward the pressure reducing valve chamber by a valve opening spring. A valve opening operation member is inserted into the outlet passage, and the pressure reducing member and the piston member are linked with each other through the valve opening operation member.

In the pressure reducing valve of this prior art 1, the gas flowing into the pressure reducing valve chamber flows between the pressure reducing member and the valve seat and flows out to the outlet passage. At this time, the seal member provided on the decompression member faces the valve seat formed around the outlet passage opening end, so that the gas flow from the decompression valve chamber to the exit passage is on the back side of the decompression member. In this state, the gas passing through the pressure reducing valve chamber is prevented from being blown onto the seal member.
The gas flowing out from the pressure reducing valve chamber flows into the pressure receiving chamber and acts on the piston member, and the balance between the secondary pressure and the elastic pressure of the valve opening spring allows the gas to flow through the valve opening operation member. Thus, the pressure reducing member is moved back and forth with respect to the valve seat, whereby the gas pressure flowing out from the pressure reducing valve chamber is reduced to a predetermined pressure.

  However, in this prior art 1, the pressure reducing member receives the gas pressure in the pressure reducing valve chamber, that is, the primary pressure, and is urged toward the valve seat by the amount corresponding to the seal area when the seal member contacts the valve seat. The For this reason, for example, when the primary pressure changes due to consumption of stored gas in the gas container, the decompression member moves forward and backward under the influence thereof, and as a result, there is a problem that the secondary pressure fluctuates from a predetermined pressure.

  On the other hand, there is provided a pressure reducing valve in which a primary pressure is applied by providing a seal portion at a site different from the valve seat contact portion of the pressure reducing member so that the secondary pressure can be maintained at a predetermined pressure even if the primary pressure fluctuates. (For example, refer to Patent Document 2, hereinafter referred to as Conventional Technology 2).

  That is, in this prior art 2, as shown in FIG. 5, for example, a mounting space (52) is formed in the housing (51), and the first cylindrical portion (53) is inserted into the mounting space (52) from the housing (51). ) And the second cylindrical portion (54) protrude from each other. An inlet passage (55) is formed in the first tube portion (53), and an outlet passage (56) is formed in the second tube portion (54). A cylindrical pressure reducing member (57) is fitted on the outer side of the first cylindrical portion (53) so as to be movable back and forth. A pressure reducing valve chamber (58) is formed inside the pressure reducing member (57). It is.

  A valve seat (59) is formed at the tip of the second tube portion (54) so as to face the pressure reducing member (57), and a seal member (60) is attached to the valve seat (59). is there. The pressure reducing member (57) is configured to move forward and backward with respect to the valve seat (59) so as to contact and separate from the seal member (60). In the state separated from the seal member (60), the inlet passage (55), the pressure reducing valve chamber (58), and the outlet passage (56) communicate with each other in this order. In a state where the pressure reducing member (57) is in contact with the seal member (60), the communication between the pressure reducing valve chamber (58) and the outlet passage (56) is blocked.

  In the mounting space (52), a piston member (61) is slidably inserted into the inner peripheral surface of the mounting space (52). The piston member (61) and the pressure reducing member (57) Are connected together. A pressure receiving chamber (62) communicating with the outlet passage (56) is formed on one side of the piston member (61), and the pressure reducing member (57) is connected to the valve seat by the gas pressure in the pressure receiving chamber (62). The piston member (61) is pressed in the direction approaching the (59) side. On the other hand, a valve opening spring (63) is arranged in the mounting space (52) on the other side of the piston member (61). The piston member (61) is biased in the direction in which the pressure reducing member (57) is separated from the valve seat (59) by the elastic force of the valve opening spring (63).

  A seal portion (64) is slidably provided between the pressure reducing member (57) and the first tube portion (53), and the pressure reducing valve chamber (58) is provided with the seal portion (64 ) And the above-described valve seat (59). The seal area (S) of the seal portion (64) is as large as the valve seat seal area (S0) when the pressure reducing member (57) contacts the seal member (60) of the valve seat (59). It is set.

  In this prior art 2, when the pressure reducing member receives the primary pressure of the gas flowing into the pressure reducing valve chamber, the valve seat seal area (S0) and the seal area (S) of the seal portion are substantially equal. The pressing force that biases the pressure reducing member toward the valve seat is offset with the pressing force that biases the pressure-reducing member away from the valve seat. As a result, the pressure reducing member is hardly affected by the fluctuation of the primary pressure, and moves forward and backward in a balance between the gas pressure in the pressure receiving chamber applied to the piston member and the elastic pressure of the valve opening spring. Even if changes, the secondary pressure is maintained at a predetermined pressure corresponding to the elastic pressure of the valve opening spring.

  However, in this prior art 2, since the sealing member attached to the valve seat faces the opening end of the inlet passage through the pressure reducing valve chamber, the high pressure that flows into the pressure reducing valve chamber and flows out to the outlet passage. This gas was sprayed on the seal member, and as a result, there was a problem that the seal member deteriorated early. Furthermore, in this prior art 2, the pressure reducing member is formed in a cylindrical shape to constitute the peripheral wall of the pressure reducing valve chamber, and since it is large and has a large mass, the response to sudden pressure fluctuation is low, and the secondary pressure is reduced. There is also a possibility that it cannot be maintained well at a predetermined pressure.

JP-A-2-11599 JP 2004-38982 A

  The technical problem of the present invention is to solve the above-mentioned problems, to suppress the influence of the primary pressure on the pressure reducing operation of the pressure reducing member, to control the secondary pressure to a predetermined pressure, and to respond well to pressure fluctuations, And it is providing the pressure reducing valve which can lengthen the lifetime of the sealing member provided in the pressure reducing member.

In order to solve the above problems, the present invention is configured as follows, for example, based on FIGS. 1 to 4 showing an embodiment of the present invention.
That is, the present invention relates to a pressure reducing valve, and an inlet passage (9), a pressure reducing valve chamber (10), and an outlet passage (11) are formed in this order in a housing (5) and open to the pressure reducing valve chamber (10). A valve seat (18) is formed around the open end of the outlet passage (11), and the pressure reducing member (19) can be moved forward and backward with respect to the valve seat (18) in the pressure reducing valve chamber (10). The pressure reducing member (19) is inserted and a seal member (20) is provided to face the valve seat (18), and a working chamber (14) is provided in the housing (5). The working chamber (14) The piston member (27) is inserted into the piston member (27) so as to be freely slidable, a pressure receiving chamber (28) is formed on one side of the piston member (27), and the pressure receiving chamber (28) communicates with the outlet passage (11). The piston member (27) is biased in the direction away from the pressure reducing valve chamber (10) by the gas pressure flowing into the pressure receiving chamber (28), and the valve opening spring provided in the housing (5). (30) urges the piston member (27) toward the pressure reducing valve chamber (10), and A pressure reducing device in which the valve opening operation member (21) is inserted into the passage (11) and the pressure reducing member (19) and the piston member (27) are linked to each other via the valve opening operation member (21). A valve,
A first seal portion (24) is slidably provided between the pressure reducing member (19) and the inner surface of the pressure reducing valve chamber (10), and a first seal area ( S1) is set wider than the valve seat seal area (S0) by the seal member (20) in contact with the valve seat (18), and the gas introduction path (25) is formed in the pressure reducing member (19). The inlet passage (9) is communicated with the valve chamber space (A) between the first seal portion (24) and the valve seat (18) via the gas introduction passage (25). On the upstream side of the valve chamber space (A), the second seal part (26) can be slid freely between the housing (5) or the member (22) fixed thereto and the pressure reducing member (19). The second seal area (S2) by the second seal portion (26) is set to a width substantially equal to the area difference between the first seal area (S1) and the valve seat seal area (S0). It is characterized by that.

  The gas that flows into the pressure reducing valve chamber from the inlet passage and moves toward the outlet passage flows so as to bypass the portion of the pressure reducing member that faces the valve seat. The seal member provided on the pressure reducing member faces a valve seat formed around the opening end of the outlet passage, and is disposed on the back side of the pressure reducing member with respect to the gas flow from the pressure reducing valve chamber to the outlet passage. Therefore, the seal member is not exposed to a gas jet passing through the pressure reducing valve chamber.

  The gas passes through the gap between the decompression member and the valve seat and flows out to the outlet passage. At this time, due to the primary pressure of the gas flowing into the valve chamber space between the first seal portion and the valve seat, the pressure reducing member is in accordance with the area difference between the valve seat seal area and the larger first seal area. It is pushed in the direction away from the valve seat. On the other hand, the pressure reducing member is pressed toward the valve seat according to the second seal area by the primary pressure applied to the second seal portion. Since the area of the second seal is approximately equal to the above-described area difference, the pressing force of the primary pressure applied to the pressure reducing member cancels each other. Here, the above-mentioned area where the second seal area is substantially equal to the above-mentioned area difference includes a case where there is a difference due to a dimensional tolerance or assembly error in manufacturing each member.

  A part of the gas flowing out to the outlet passage flows into the pressure receiving chamber and presses the piston member against the elastic force of the valve opening spring. Since the pressure reducing member is linked to the piston member via the valve opening operation member, the pressure reducing member moves forward and backward with respect to the valve seat by a balance between the secondary pressure of the gas flowing into the pressure receiving chamber and the elastic pressure of the valve opening spring. Thus, the secondary pressure of the gas flowing out to the outlet passage is maintained at a predetermined pressure.

  The pressure reducing member may be formed in a small size so that it can be inserted into the pressure reducing valve chamber, and the first seal portion and the second seal portion may be formed. The pressure reducing member and the pressure reducing valve chamber have a specific structure and shape. It is not limited to. However, a cylindrical fixing member is inserted into the pressure reducing valve chamber from the inlet passage side, and the fixing member is fixed in a tightly sealed manner to the housing, and the pressure reducing member is slidably fitted to the fixing member. When the second seal portion is provided between the fixing member and the decompression member, and the inlet passage communicates with the gas introduction passage through the internal space of the fixing member, the decompression member is further reduced in size. It is preferable because the responsiveness to pressure fluctuation can be improved and the secondary pressure can be precisely controlled by a predetermined pressure.

Since the present invention is configured and operates as described above, the following effects can be obtained.
(1) Since the second seal area is set to an area substantially equal to the area difference between the valve seat seal area and the larger first seal area, the pressing force of the primary pressure applied to the pressure reducing member is This cancels out each other, and the influence of the primary pressure on the pressure reducing operation of the pressure reducing member can be suppressed.

  (2) Since the pressure reducing member inserted into the pressure reducing valve chamber is small and lightweight, it can respond well to sudden pressure fluctuations.

  (3) The gas flowing into the pressure reducing valve chamber from the inlet passage flows so as to bypass the portion facing the valve seat of the pressure reducing member, and the seal member provided on the pressure reducing member is Since it is arranged on the back side, the seal member is not exposed to a gas jet passing through the pressure reducing valve chamber, and can be prevented from being deteriorated due to the blowing of gas, thereby extending its life.

  (4) A cylindrical fixing member is inserted into the pressure reducing valve chamber from the inlet passage side, and the fixing member is fixed in a tightly sealed manner to the housing, and the pressure reducing member is slidably fitted to the fixing member. In addition, when the second seal portion is provided between the fixing member and the decompression member, and the inlet passage is communicated with the gas introduction passage through the internal space of the fixing member, the decompression member is further layered. The secondary pressure can be precisely controlled by a predetermined pressure by improving the responsiveness to pressure fluctuations.

  (5) The housing is composed of a first housing part and a second housing part that are detachably connected to each other, and a mounting space is formed in the first housing part, and in the second housing part. The working chamber is formed, the partition member is fixed to the first housing portion so as to cover the mounting space, and the pressure reducing valve chamber is formed between the partition member and the first housing portion. In the case where the outlet passage is formed through the partition member, the pressure reducing valve can be constituted by a valve chamber side unit and a working chamber side unit so as to be detachable from each other. As a result, the secondary pressure can be easily changed and set to a predetermined pressure simply by selecting the piston member and valve opening spring of the working chamber side unit in common with the valve chamber side unit. Since the position of the gas outlet opening in the housing can be changed only by changing the working chamber side unit, it is possible to easily cope with a design change such as a gas flow path.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a pressure reducing valve showing a first embodiment of the present invention, and FIG.

As shown in FIG. 1, this pressure reducing valve (1) is mounted in a mounting hole (3) formed in a block-shaped pressure reducing valve unit (2), and a gas formed in the pressure reducing valve unit (2). For example, it is connected to a gas consuming device such as a fuel cell via the flow path (4).
The pressure reducing valve (1) has an inlet nozzle (6) formed at one end protruding from the mounting hole (3) on the outer surface of the housing (5), and a gas is formed at the end surface of the inlet nozzle (6). An inlet (7) is opened, and a gas outlet (8) is opened at the other end facing the bottom of the mounting hole (3). In the housing (5), an inlet passage (9), a pressure reducing valve chamber (10), and an outlet passage (11) are formed in this order between the gas inlet (7) and the gas outlet (8). It is.

  The housing (5) is composed of a first housing part (5a) on the inlet nozzle (6) side and a second housing part (5b) on the gas outlet (8) side, and is separated from each other by a bolt (12). It is fixed as possible. A mounting space (13) is formed in the first housing part (5a), and a working chamber (14) is formed in the second housing part (5b) so as to face each other. 5a) constitutes the valve chamber side unit (15), and the second housing part (5b) constitutes the working chamber side unit (16).

  A bottomed cylindrical partition member (17) is screwed and fixed to the first housing part (5a) so as to cover the mounting space (13). In the partition member (17), the pressure reducing valve chamber (10) is formed facing the mounting space (13), and the partition wall (17a) at the bottom of the partition member (17) The exit channel (11) is transparent.

  In the pressure reducing valve chamber (10), a valve seat (18) is formed around the opening end of the outlet passage (11) that opens to the pressure reducing valve chamber (10). A pressure reducing member (19) is inserted so as to be movable back and forth with respect to 18). The pressure reducing member (19) is provided with a seal member (20) at a position facing the valve seat (18), and is brought into contact with and separated from the valve seat (18) by the forward and backward movement of the pressure reducing member (19). It is. A valve opening operation member (21) protrudes from the tip of the decompression member (19) and is inserted into the outlet passage (11).

  A cylindrical fixing member (22) is inserted into the first housing portion (5a) from the inlet passage (9) side toward the pressure reducing valve chamber (10). The fixing member (22 ) Of the inlet passage side is fixed on the inner surface of the first housing portion (5a) in a tightly sealed manner. The rear end portion of the pressure reducing member (19) is fitted on the outer peripheral surface of the fixing member (22) on the pressure reducing valve chamber side. Further, a biasing spring (23) is mounted between the pressure reducing member (19) and the inner surface of the mounting space (13), and the pressure reducing member (19) is provided by the elastic force of the biasing spring (23). Is biased toward the valve seat (18).

  A first seal portion (24) is provided on the outer peripheral surface of the pressure reducing member (19) between the inner peripheral surface of the pressure reducing valve chamber (10) so as to be slidable. A valve chamber space (A) is formed between the inner surface of the pressure reducing valve chamber (10) and the outer surface of the pressure reducing member (19) between the first seal portion (24) and the valve seat (18). A gas introduction path (25) is formed inside the decompression member (19), and the internal space (22a) of the fixing member (22) and the gas introduction path (25) are sequentially passed through. The inlet passage (9) communicates with the valve chamber space (A). On the upstream side of the valve chamber space (A), a second seal portion (26) is provided slidably and slidably between the pressure reducing member (19) and the fixing member (22). Note that the outer surface of the pressure reducing member (19) between the second seal portion (26) and the first seal portion (24) communicates with the atmosphere via the mounting space (13).

  As shown in FIG. 2, the first seal area (S1) by the first seal portion (24) is larger than the valve seat seal area (S0) by the seal member (20) in contact with the valve seat (18). Widely set. On the other hand, the second seal area (S2) by the second seal portion (26) is substantially equal to the area difference (S1-S0) between the first seal area (S1) and the valve seat seal area (S0). The size is set.

  As shown in FIG. 1, in the second housing part (5b) constituting the working chamber side unit (16), the piston member (27) is inserted into the working chamber (14) so as to be movable forward and backward. It is. The outer peripheral surface of the piston member (27) is tightly slid on the inner peripheral surface of the working chamber (14), and a pressure receiving chamber (28) is formed on one side of the piston member (27). The pressure receiving chamber (28) has an opening at the downstream end of the outlet passage (11), and the secondary pressure of the gas flowing into the pressure receiving chamber (28) from the outlet passage (11) The piston member (27) is pressed away from the pressure reducing valve chamber (10).

  On the other hand, a cylindrical spring receiving member (29) is inserted into the working chamber (14) on the opposite side of the pressure receiving chamber (28) with the piston member (27) interposed therebetween. A valve opening spring (30) is mounted between (29) and the piston member (27). The piston member (27) is urged toward the pressure reducing valve chamber (10) by the elastic force of the valve opening spring (30).

  The valve opening operation member (21) inserted through the outlet passage (11) has a tip abutted against the piston member (27). The valve opening operating member (21) is biased toward the piston member (27) by the biasing spring (23) via the pressure reducing member (19), so the pressure reducing member (19) It is in a state of being linked to the piston member (27) via the operation member (21), and moves forward and backward with respect to the valve seat (18) following the piston member (27).

  The piston member (27) has a cylindrical small-diameter portion (31) extending on the gas outlet (8) side opened to the second housing portion (5b). The small-diameter portion (31) is connected to the piston member (27). Is inserted into the spring receiving member (29) so as to be slidable. Inside the piston member (27), a gas lead-out path (32) is provided through the small-diameter portion (31), and the gas lead-out path (32) and the spring receiving member (29) are provided. The pressure receiving chamber (28) communicates with the gas outlet (8) through the internal space (29a) in order.

Next, the operation of the pressure reducing valve will be described.
Gas flowing from the gas inlet (7) into the valve chamber space (A) of the pressure reducing valve chamber (10) through the inlet passage (9), the internal space (22a) of the fixing member (22), and the gas introduction passage (25) in this order. Is reduced in pressure by passing between the valve seat (18) and the pressure reducing member (19) and flows out to the outlet passage (11). At this time, the gas flowing into the valve chamber space (A) from the gas introduction path (25) flows around a portion of the decompression member (19) facing the valve seat (18). For this reason, the seal member (20) attached to this portion of the decompression member (19) is not exposed to the gas jet.

  The pressure reducing member (19) is pressed toward the valve seat (18) by the primary pressure applied to the valve seat seal area (S0) by the gas flowing into the valve chamber space (A), and the first seal portion (24) Is pressed in a direction away from the valve seat (18) by the primary pressure applied to the valve seat. Since the first seal area (S1) of the first seal portion (24) is larger than the valve seat seal area (S0), the pressure reducing member (19) is a primary pressure applied to the area difference (S1-S0). It is pushed in a direction away from the valve seat (18). However, in the second seal portion (26) on the upstream side of the valve chamber space (A), the pressure reducing member (19) is moved toward the valve seat (18) by the primary pressure applied to the second seal area (S2). Pressed. Since the second seal area (S2) is substantially equal to the area difference between the first seal area (S1) and the valve seat seal area (S0), the primary pressure applied to the second seal portion (S2) is reduced. The pressing force is substantially equal to the pressing force of the primary pressure applied to the valve chamber space (A) and is canceled out. As a result, when the pressure reducing member (19) moves forward and backward with respect to the valve seat (18), it is hardly affected by fluctuations in the primary pressure such as gas consumption.

  A part of the gas flowing out from the valve chamber space (A) to the outlet passage (11) flows into the pressure receiving chamber (28), and the remaining portion is the gas outlet passage (32) and the spring receiving member ( After passing through the internal space (29a) of 29) in order, the gas flows out to the gas outlet (8) and is guided from the gas flow path (4) to a gas consuming device (not shown). At this time, the piston member (27) moves forward and backward by the balance between the secondary pressure of the gas flowing into the pressure receiving chamber (28) and the elastic pressure of the valve opening spring (30). Since the pressure reducing member (19) is linked to the piston member (27) via the valve opening operation member (21), the valve seat (18) follows the forward / backward movement of the piston member (27). ), The secondary pressure is maintained at a predetermined set pressure.

That is, when the secondary pressure of the gas flowing into the pressure receiving chamber (28) increases, the piston member (27) is pressed against the secondary pressure against the elastic pressure of the valve opening spring (30). It moves in a direction away from the pressure reducing valve chamber (10). The pressure reducing member (19) linked to the piston member (27) via the valve opening operation member (21) follows the valve member (18) and follows the valve member (18). ) And the pressure reducing member (19) is narrowed. As a result, the secondary pressure of the gas flowing out from the gap is reduced and maintained at a predetermined pressure.
Conversely, when the secondary pressure of the gas flowing into the pressure receiving chamber (A) becomes low, the piston member (27) biases the elastic pressure of the valve opening spring (30) against the secondary pressure. Then, it moves to the pressure reducing valve chamber (10) side. Since the pressure reducing member (19) is pressed by the piston member (27) via the valve opening operation member (21) and is separated from the valve seat (18), the valve seat (18) and the pressure reducing member (19) As a result, the secondary pressure of the gas flowing out from the gap rises and is maintained at a predetermined pressure.

  In the first embodiment, the pressure reducing member (19) and the piston member (27) are linked to each other via the valve opening operation member (21) protruding from the tip of the pressure reducing member (19). However, in the present invention, the valve-opening operation member may protrude from the piston member, or may be constituted by a member other than the decompression member or the piston member. Further, the valve opening operation member can be fixed to both the pressure reducing member and the piston member.

  However, if the tip of the valve opening operation member (21) is configured to be separated from the piston member (27) by abutting against the piston member (27) as in the first embodiment, the first housing portion The valve chamber side unit (15) and the working chamber side unit (16) can be easily separated by simply releasing the fixation between the (5a) and the second housing part (5b). In addition to being able to be exchanged, there is an advantage that when the secondary pressure becomes abnormally high, the gas staying in the flow path downstream of the outlet path can be easily flowed to the inlet path side.

  That is, for example, when the secondary pressure becomes abnormally high due to a failure of the gas flow path (4) or the gas consuming device, the piston member (27) moves in a direction away from the pressure reducing valve chamber (10). However, since the pressure reducing member (19) is only pressed against the piston member (27) by the biasing spring (23), the secondary pressure applied to the valve seat seal area (S0) rather than this biasing force is pushed. When the pressure increases, the pressure reducing member (19) is separated from the valve seat (18). For this reason, when the gas in the inlet passage (9) is lowered below the secondary pressure, the gas in the outlet passage (11) flows out through the pressure reducing valve chamber (10) to the inlet passage (9). When the pressure reducing valve (1) is attached to the container valve, the gas outlet (8) is also used as a filling port, and when a high-pressure fresh gas is introduced from the gas outlet (8), the piston member (27 ) And the pressure reducing member (19) operate in the same manner, so that the fresh gas can be filled into the gas container through the outlet passage (11), the pressure reducing valve chamber (10), and the inlet passage (9) in this order.

  In the first embodiment, the gas inlet (7), the inlet channel (9), the outlet channel (11), and the gas outlet (8) are arranged on the same straight line. The mounting of the valve (1) and the formation of the gas flow path (4) in the pressure reducing valve unit (2) can be simplified, which is preferable. However, in the present invention, the gas outlet (8) can be formed at an arbitrary position on the outer surface of the housing (5), for example, as in the second embodiment shown in FIG.

  That is, in this second embodiment, the gas outlet (8) is opened on the outer peripheral surface of the second housing part (5b), and the pressure receiving chamber (28) and the gas outlet passage (32) formed through the peripheral side surface thereof. Are connected to the gas outlet (8) through an outlet passage (11) formed through the partition member (17). The gas flowing into the pressure receiving chamber (28) from the outlet passage (11) is bent in a direction orthogonal to the inlet passage (9), and flows out from the gas outlet (8) through the gas outlet passage (32). The other configuration is the same as that of the first embodiment described above, and functions in the same manner, so that the description is omitted.

FIG. 4 is a sectional view of a pressure reducing valve showing a third embodiment of the present invention.
In the first and second embodiments described above, the fixing member (22) is inserted into the pressure reducing valve chamber (10) from the inlet passage (9) side in the first housing portion (5a), and this fixing is performed. Since the second seal portion (26) is provided between the member (22) and the pressure reducing member (19), the pressure reducing member (19) can be formed in a small size, which is preferable. On the other hand, in the third embodiment, the second seal portion (26) is provided so as to be slidable between the inner surface of the first housing portion (5a) and the inlet passage side end portion of the pressure reducing member (19). . In the third embodiment, the number of parts can be reduced by omitting the fixing member, and the assembly of the decompression member (19) and the like can be simplified, and there is an advantage that it can be implemented at low cost. The other configuration is the same as that of the first embodiment described above, and functions in the same manner, so that the description is omitted.

  The pressure reducing valve described in each of the above embodiments is illustrated to embody the technical idea of the present invention, and includes a housing, a pressure reducing member, a pressure reducing valve chamber, a valve seat, a partition member, a pressure receiving chamber, and a valve opening. The shape, structure, arrangement, and the like of each member such as the operation member, piston member, fixing member, and spring receiving member are not limited to these embodiments, and various modifications can be made within the scope of the claims of the present invention. Needless to say, the fluid to be handled is not limited to a specific type such as hydrogen gas.

  For example, in the above embodiment, the first chamber portion constitutes the valve chamber side unit and the second housing portion constitutes the working chamber side unit. However, in the present invention, the pressure reducing valve chamber and the working chamber are formed in one housing. May be. In the above-described embodiment, the case where the pressure reducing valve is attached to the pressure reducing valve unit has been described. However, it goes without saying that the pressure reducing valve of the present invention may be incorporated not only in the middle portion of the pipe line but also in the housing of the container valve.

  The pressure reducing valve of the present invention is capable of controlling the secondary pressure to a predetermined pressure by suppressing the influence of the primary pressure on the pressure reducing operation of the pressure reducing member, can respond well to pressure fluctuations, and is provided with a seal member provided on the pressure reducing member Therefore, it can be suitably used for pressure reducing valves attached to piping lines and gas containers of various gas facilities such as hydrogen gas supply paths.

It is sectional drawing of the pressure-reduction valve which shows 1st Embodiment of this invention. It is sectional drawing of the valve chamber side unit of the pressure-reduction valve of 1st Embodiment. It is sectional drawing of the pressure-reduction valve which shows 2nd Embodiment of this invention. It is sectional drawing of the pressure-reduction valve which shows 3rd Embodiment of this invention. It is sectional drawing of the pressure reducing valve which shows the prior art 2. FIG.

Explanation of symbols

1 ... Pressure reducing valve 5 ... Housing
5a ... 1st housing part
5b ... 2nd housing part 9 ... Entrance way
10 ... Reducing valve chamber
11 ... Exit road
13 ... Installation space
14 ... Working room
17… Division member
18 ... Valve seat
19 ... decompression member
20… Seal member
21… Valve opening operation member
22 ... Fixing member
22a: Internal space of the fixing member (22)
24 ... 1st seal part
25… Gas introduction path
26 ... Second seal part
27 ... Piston member
28 ... Pressure chamber
30 ... Valve opening A ... Valve space
S0: Valve seat seal area
S1 ... 1st seal area
S2 ... Second seal area

Claims (3)

In the housing (5), an inlet passage (9), a pressure reducing valve chamber (10), and an outlet passage (11) are formed in order,
A valve seat (18) is formed around the opening end of the outlet passage (11) that opens to the pressure reducing valve chamber (10),
A pressure-reducing member (19) is inserted into the pressure-reducing valve chamber (10) so as to be movable back and forth with respect to the valve seat (18), and a seal member (20) is inserted into the pressure-reducing member (19). To face to,
A working chamber (14) is provided in the housing (5), and a piston member (27) is slidably inserted into the working chamber (14), and a pressure receiving chamber (on one side of the piston member (27)). 28)
The pressure receiving chamber (28) communicates with the outlet passage (11), and the piston member (27) is separated from the pressure reducing valve chamber (10) by the gas pressure flowing into the pressure receiving chamber (28). The piston member (27) is urged toward the pressure reducing valve chamber (10) by a valve opening spring (30) provided in the housing (5).
The valve opening operating member (21) is inserted into the outlet passage (11), and the pressure reducing member (19) and the piston member (27) are linked to each other via the valve opening operating member (21). A pressure reducing valve,
A first seal portion (24) is slidably provided between the pressure reducing member (19) and the inner surface of the pressure reducing valve chamber (10), and a first seal area ( S1) is set wider than the valve seat seal area (S0) by the seal member (20) in contact with the valve seat (18),
A gas introduction path (25) is formed in the pressure reducing member (19), and the inlet path (9) is connected to the first seal portion (24) and the valve seat through the gas introduction path (25). (18) communicating with the valve chamber space (A)
On the upstream side of the valve chamber space (A), the second seal portion (26) is slidably sealed between the housing (5) or the member (22) fixed thereto and the pressure reducing member (19). The second seal area (S2) by the second seal portion (26) is provided freely, and is abbreviated as the area difference (S1-S0) between the first seal area (S1) and the valve seat seal area (S0). A pressure reducing valve characterized by being set to an equal width. A cylindrical fixing member (22) is inserted into the pressure reducing valve chamber (10) from the inlet passage (9) side, and the fixing member (22) is fixed to the housing (5) in a tightly sealed manner.
The pressure reducing member (19) is slidably fitted to the fixing member (22), and the second seal portion (26) is interposed between the fixing member (22) and the pressure reducing member (19). The pressure reducing valve according to claim 1, wherein the pressure reducing valve is provided and communicated with the gas introduction passage (25) through the internal space (22a) of the fixing member (22). The housing (5) is composed of a first housing part (5a) and a second housing part (5b) fixed to be detachable from each other, and the mounting space (13) is provided in the first housing part (5a). And forming the working chamber (14) in the second housing part (5b),
The partition member (17) is fixed to the first housing part (5a) in a state where the mounting space (13) is covered, and the partition member (17) and the first housing part (5a) are placed between the partition member (17) and the first housing part (5a). The pressure reducing valve according to claim 1 or 2, wherein the pressure reducing valve chamber (10) is formed, and the partition member (17) is provided with the outlet passage (11).

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