JP2008075742A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve device reliably shutting off a flow path with a changeover into a closing position and still holding good closing operation over a long period. <P>SOLUTION: An inlet pathway 7 and a valve chest 8 are provided in a housing 6, and a valve seat 13 is formed near an opening end 7a of the inlet pathway 7 opening to a valve chest 8. The valve seat 13 consists of a first valve seat 11 formed on the inner peripheral face of the inlet pathway 7, and a second valve seat 12 formed in the state of encircling the opening end 7a. A seal portion 23 is provided on a valve member 16 inserted into the valve chest 8. The seal portion 23 consists of a first seal portion 21 inserted into the inlet pathway 7 in slide contact with the first valve seat 11 in a sealing manner, and a second seal portion 22 for abutting on the second valve seat 12 in a sealing manner. The second valve seat 12 and the second seal portion 22 are formed of metal materials, and a sealing face width during abutment is set to be 1 mm or less. The second valve seat 12 is formed as an incline wider outward as tending from the opening end 7a of the inlet pathway 7 into the valve chest 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve device such as a check valve or a residual pressure holding valve. More specifically, the valve member can be reliably shut off by switching to a closed position and can be closed well over a long period of time. The present invention relates to a valve device.

  In the valve device, for example, a so-called one-way valve such as a check valve or a residual pressure holding valve allows a gas flow from the inlet side to the outlet side, but functions to block the reverse gas flow. Conventionally, as this valve device, for example, as shown in FIGS. 4 and 5, an inlet passage (52), a valve chamber (53), and an outlet passage (54) are formed in order in a housing (51). A valve seat (56) is formed at the periphery of the opening end (55) of the inlet passage (52) that opens to (53), and the valve member (57) is inserted into the valve chamber (53) to the valve seat (56). The valve member (57) is provided with a seal portion (58), and the valve member (57) is urged toward the valve seat (56) by a valve closing spring (59). Yes (see, for example, Patent Document 1).

  When the valve device is used as, for example, a check valve attached to a gas filling passage, the inlet passage (52) is communicated with the filling port (60), and the outlet passage (54) is a gas filling passage ( 61) to communicate with the interior space of the gas container. As a result, at the time of gas consumption for extracting the stored gas from the gas container, a part of the stored gas in the gas container flows into the valve chamber (53) from the outlet path (54) through the gas filling path (61). As shown in FIG. 4 (a), the valve member (57) advances to the valve seat (56) side by the stored gas pressure and the elastic pressure of the valve closing spring (59). ) To the closed posture (X) in which the seal portion (58) abuts.

  At this time, while the stored gas pressure is high, the valve member (57) is strongly pressed to the valve seat (56) side by the gas pressure, and a part of the seal portion (58) is greatly deformed. The positioning portion (62) formed on the member (57) is received by the inner end face of the valve chamber (53). However, if the stored gas pressure decreases with gas consumption, the gas pressure flowing into the valve chamber (53) decreases, and the force pressing the valve member (57) decreases. For example, as shown in FIG. Further, the valve member (57) is retracted by the elastic restoring force of the seal portion (58), and the positioning portion (62) is separated from the inner surface of the valve chamber (53).

  On the other hand, when the stored gas is consumed and the gas container is emptied, a filling device is connected to the filling port (60), and fresh gas is introduced into the inlet passage (52). Due to the pressure of the fresh gas introduced into the inlet passage (52), the valve member (57) has the elastic pressure of the valve closing spring (59) and the gas pressure in the valve chamber (53) as shown in FIG. The seal portion (58) is switched to the open posture (Y) separated from the valve seat (56). As a result, the inlet passage (52) and the valve chamber (53) communicate with each other, and the fresh gas passes from the inlet passage (52) to the valve chamber (53), the outlet passage (54), and the gas filling passage (61). The gas container is filled in the internal space in order. When the pressure in the valve chamber (53) becomes substantially the same as the pressure in the inlet passage (52) by the above filling, the valve member (57) is moved by the elastic force of the valve closing spring (59) to the valve seat (56 ) Side is moved to the closed position (X) and the filling operation is completed.

JP-A-8-159597

  In the above prior art, when the valve member (57) is switched to the closed position (X), the seal portion (58) contacts the valve seat (56), so that the inlet passage (52) and the valve chamber (53) Is disconnected. However, if foreign matter such as dust is caught between the valve seat (56) and the seal portion (58), or if the valve seat (56) or the seal portion (58) is damaged by contact with the foreign matter, etc. There is a risk that gas leaks from the biting part or the damaged part.

  Further, the seal portion (58) is generally formed of a rubber elastic body such as an O-ring, but the valve seat (56) is formed at a corner portion that is the peripheral edge of the open end (55) of the inlet passage (52). In particular, when the gas pressure in the valve chamber (53) is high, as shown in FIG. 4 (a), the outer half of the seal portion (58) in the mounting groove (63) Deformed into the state of being bitten by (56). For this reason, the deformation of the seal portion (58) becomes large, and the elastic restoring force is likely to be reduced early or the material is deteriorated.In addition, the stored gas pressure in the gas container, that is, the flow into the valve chamber (53). Since the pressing force (hereinafter also referred to as sealing force) on the valve seat (56) during sealing changes in response to changes in the gas pressure, the above-mentioned reduction and deterioration of the restoring force will ensure a reliable closing operation. There is a risk that it will not be possible.

  The technical problem of the present invention relates to a valve device that eliminates the above-mentioned problems and can reliably shut off a flow path by switching to a closed posture and can perform a good closing operation over a long period of time.

In order to solve the above-described problems, the present invention is described as follows, for example, based on FIGS. 1 to 3 showing an embodiment of the present invention.
That is, the present invention relates to a valve device, which includes a gas flow path (7) and a valve chamber (8) in a housing (6), and an open end of the gas flow path (7) that opens to the valve chamber (8) ( 7a) A valve seat (13) is formed in the vicinity, and a valve member (16) is inserted into the valve chamber (8) so as to be movable back and forth with respect to the valve seat (13). (23) is provided, and the valve member (16) is placed in a closed position (X) in which the seal portion (23) abuts against the valve seat (13) in a coherent manner, and the seal portion (23) is a valve seat. A valve device configured to be switchable to an open posture (Y) separated from (13), wherein the valve seat (13) is formed on the inner peripheral surface of the gas flow path (7). (11) and a second valve seat (12) formed so as to surround the open end (7a), and the seal portion (23) is inserted into the gas flow path (7). The first seal portion (21) slidingly contacting the first valve seat (11) and the valve member (16) advance toward the open end (7a). Further, the second valve seat (12) is configured to include a second seal portion (22) that is in close contact with the second valve seat (12).

  When the valve member is switched to the closed position in which the valve member is advanced to the valve seat side, that is, the opening end side of the gas flow path, the first seal portion is inserted into the gas flow path and slidably contacts the first valve seat. 2 seal part contacts the 2nd valve seat. Since the above-mentioned two seal portions are in contact with the valve seat and cut off, it has a so-called double seal structure, and a foreign object is temporarily caught between one seal portion and the valve seat, or Even if one seal portion is damaged or the like, the gas flow path and the valve chamber are reliably blocked by the other seal portion and the valve seat.

  Here, when the valve member is switched to the closed position, the first seal portion is inserted into the gas flow path and is in sliding contact with the inner surface of the gas flow path. Therefore, in this closed position, a pressing force is applied to the first seal portion from the diameter direction of the gas flow path. For this reason, when the first seal portion is constituted by an O-ring, for example, a force is applied in a direction in which the O-ring is pushed into the mounting groove. Part of the part is not greatly deformed. In addition, since the pressing force to the first valve seat at the time of sealing, so-called sealing force, is not applied to the first seal portion in the advancing / retreating direction of the valve member, it is not affected by the pressure change in the valve chamber. The first valve seat can be contacted with a predetermined pressing force.

  On the other hand, when the second seal portion comes into contact with the second valve seat, a pressing force in the forward / backward direction of the valve member is applied to the second seal portion. Here, the second valve seat and the second seal portion only need to block communication between the gas flow path and the valve chamber by abutting each other, and are not limited to a specific shape or material. One of them can be made of a rubber elastic body. However, when both the second seal portion and the second valve seat are formed of a metal material and configured as a so-called metal seal structure, the second seal portion and the second valve seat are large due to high and low pressure in the valve chamber. This is preferable because it does not deform and can exhibit stable sealing performance over a long period of time. Further, in this case, both the housing material and the valve member material can be used for both, and another member such as an O-ring is not required.

  In addition, when both the second seal portion and the second valve seat are formed of a metal material, even when the gas pressure in the valve chamber is low, the seal performance is ensured by the contact between the two. It is preferable to increase the surface pressure. For this reason, the seal surface width when the second valve seat and the second seal portion contact each other is preferably set to 1 mm or less, and more preferably set to 0.5 mm or less.

  The second valve seat is not limited to a specific shape or structure, and can be formed on a plane orthogonal to the advancing / retreating direction of the valve member, for example. However, if the second valve seat is formed on an inclined surface that extends outwardly from the open end of the gas flow path to the valve chamber, the axis of the valve member is the gas center when the valve member is switched to the closed position. Easily matches the axis of the channel. For this reason, it is preferable because the first seal portion can be easily brought into contact with the first valve seat formed on the inner peripheral surface of the gas flow path.

  Since the present invention is configured and operates as described above, the following effects can be obtained.

  (1) When the valve member is switched to the closed position, the two seal portions abut against the valve seat and are shut off, so that a double seal structure is formed. Even if a foreign object is caught or the seal part or valve seat is damaged, the other seal part and valve seat can reliably shut off the gas flow path and the valve chamber, greatly increasing the rate of malfunctions. Therefore, the closing operation can be satisfactorily performed over a long period of time.

  (2) Since the so-called sealing force is not applied in the forward / backward direction of the valve member, the first seal portion abuts on the first valve seat with a predetermined pressing force without being affected by the change in the gas pressure in the valve chamber. And stable sealing performance can be exhibited.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment in which the valve device of the present invention is used as a check valve attached to a gas filling path of a container valve. FIG. 1 is a cross-sectional view of the check valve when gas is consumed. FIG. 3 is a cross-sectional view of a check valve during gas filling.

  As shown in FIG. 1, the check valve (1) is screwed and fixed to a mounting hole (4) formed on the outer surface of the main body housing (3) of the container valve (2). A gas filling path (5) communicating with the internal space of the gas container (not shown) in 4) is formed in the main body housing (3).

  The non-return valve (1) housing (6) comprises a cylindrical first housing member (6a) and a bottomed cylindrical second housing member (6b). Both housing members (6a, 6b) Are screwed together and formed into a unit shape. In the housing (6), an inlet passage (7), a valve chamber (8), and an outlet passage (9) are formed in order, and a filling port (10) is formed at the outer end of the inlet passage (7). A valve seat (13) is formed in the vicinity of the open end (7a) of the inlet passage (7) on the valve chamber (8) side. The valve seat (13) has a first valve seat (11) formed on the inner peripheral surface of the inlet passage (7) and an outward extension from the open end (7a) into the valve chamber (8). The inclined surface includes a second valve seat (12) formed so as to surround the open end (7a).

  The outlet passage (9) is formed in a groove shape in the threaded screw portion (14) of the first housing member (6a) with the second housing member (6b). The outlet passage (9) is connected to the gas filling passage (5) via a communication space (15) formed between the outer surface of the second housing member (6b) and the inner surface of the mounting hole (4). ).

  In the valve chamber (8), a piston-like valve member (16) is inserted so that the valve seat (13) can move forward and backward with respect to the open end (7a) formed in the vicinity. A valve closing spring (17) disposed between the valve member (16) and the second housing member (6b) is biased toward the opening end (7a). A pressure receiving chamber (19) is formed in the valve chamber (8) between the valve member (16) and the bottom wall (18) of the second housing member (6b). 19) communicates with the gas filling passage (5) through a communication passage (20) formed through the bottom wall (18).

  The valve member (16) is provided with a seal portion (23) including a first seal portion (21) and a second seal portion (22). As shown in FIG. Is switched to the closed position (X) that has advanced toward the open end (7a), the seal portions (21, 22) abut on the valve seats (11, 12) in a coherent manner, As shown in FIG. 2, when the valve member (16) is switched to the open position (Y) retracted from the open end (7a) side, the seal portions (21, 22) are respectively connected to the valve seats. It is configured to be separated from (11, 12).

  That is, the first seal portion (21) is an O-ring attached to the peripheral surface of the tip rod-like portion (24) of the valve member (16). In the closed position (X), the inlet passage (7 ) And is in sliding contact with the first valve seat (11). On the other hand, the second seal portion (22) is formed by a corner portion of an annular step portion formed around the base portion of the tip rod-like portion (24), and the valve member (16) is formed by the opening end (7a). ) Side, it is configured to contact the second valve seat (12) in a coherent manner.

  The second valve seat (12) is composed of the inner surface of the first housing member (6a), and the second seal portion (22) is composed of the annular step portion of the valve member (16). Each is made of a metal material and has a so-called metal seal structure. The shape of the corner portion constituting the second seal portion (22) is so narrow that the width of the seal surface when contacting the second valve seat (12) is, for example, 0.5 mm or less. It is.

Next, the operation of the check valve (1) will be described.
There is a sufficient amount of stored gas remaining in the gas container, and when the stored gas is taken out and used, the stored gas passes from the gas filling path (5) through the outlet path (9) to the valve. While flowing into the chamber (8), it flows into the pressure receiving chamber (19) through the communication path (20). Therefore, the valve member (16) advances toward the open end (7a) of the inlet passage (7) by the gas pressure in the pressure receiving chamber (19) and the elastic pressure of the valve closing spring (17). Then, it switches to the closed posture (X) shown in FIG.

  In this closed position (X), the tip rod-like portion (24) of the valve member (16) is inserted into the inlet passage (7), and the first seal portion (21) is inserted into the inlet passage (7). It is in sliding contact with the first valve seat (11) formed on the inner surface of the passage (7). At this time, the O-ring constituting the first seal portion (21) is pushed into the fitting groove (25) formed in the distal end rod-like portion (24) by contact with the first valve seat (11). Unlike the above-described prior art, a part thereof is not greatly deformed. Further, since the valve member (16) is only pressed from the direction orthogonal to the advance / retreat direction and is not subjected to a force in the advance / retreat direction of the valve member (16), the sealing force by the first seal portion (21) is It is not affected by the gas pressure in the valve chamber (8) or the pressure receiving chamber (19). As a result, the sliding connection of the first seal portion (21) to the first valve seat (11) ensures the communication between the inlet passage (7) and the valve chamber (8) with a stable sealing force. Blocked.

  On the other hand, the second seal portion (22) is tightly sealed so that the valve member (16) can be received by the second valve seat (12) when the valve member (16) advances toward the open end (7a). Abut. At this time, since the seal surface width due to the contact of the second seal portion (22) with the second valve seat (12) is narrowed to be, for example, 0.5 mm or less, the valve-closing spring described above is used. Even if the second seal portion (22) is brought into contact with the second valve seat (12) by the appropriate elastic pressure of (17) or the gas pressure in the pressure receiving chamber (19), the inlet passage (7 ) And the valve chamber (13) are disconnected. Since the first seal portion (21) does not receive a force in the advancing / retreating direction of the valve member (16), the valve member (16) is opened at the open end (7a) by the elastic restoring force of the first seal portion (21). Therefore, even if the pressure in the pressure receiving chamber (19) changes, the second seal portion (22) is sure to be in a posture in contact with the second valve seat (12). Maintained.

  Next, when the stored gas is consumed and the gas container is emptied, a filling device (not shown) is connected to the filling port (10). When a high-pressure fresh gas is introduced from the filling port (10) into the inlet passage (7), the elastic pressure of the valve closing spring (17) and the gas pressure in the pressure receiving chamber (19) are caused by the gas pressure. Against this, the valve member (16) retreats from the open end (7a) of the inlet passage (7) and switches to the open posture (Y) shown in FIG.

  In this open position (Y), the valve member (16) has the tip rod-like portion (24) that has come out of the inlet passage (7) into the valve chamber (8), and therefore the first seal portion (21). Is spaced from the first valve seat (11). The second seal portion (22) is also separated from the second valve seat (12) as the valve member (16) is retracted. As a result, the inlet passage (7) and the valve chamber (8) communicate with each other, and the fresh gas passes through the valve passage (8), the outlet passage (9), and the gas filling passage (5) from the inlet passage (7). In order, it fills the interior space of said gas container. When the gas pressure in the pressure receiving chamber (19) becomes substantially the same as the pressure in the inlet passage (7) due to the filling of the fresh gas, the valve member (16) is brought into the inlet by the elastic pressure of the valve closing spring (17). The advancing to the opening end (7a) side of the path (7) is switched to the closed position (X) shown in FIG. 1, and the filling operation is completed.

  The valve device described in the above embodiment is illustrated to embody the technical idea of the present invention, and the material, shape, structure, etc. of each part are not limited to those of this embodiment. Various modifications can be made within the scope of the claims of the present invention.

  For example, although the case where the valve device is applied to a check valve has been described in the above embodiment, the valve device of the present invention can also be applied to a valve device for other uses. For example, when the valve device having the structure of the above-described embodiment is used as a residual pressure holding valve of a container valve, for example, the inlet path is communicated with the internal space of the gas container via a gas extraction path and a shut-off valve, and the outlet The road is connected to the gas outlet.

  In the above embodiment, the case where the gas flow path forming the valve seat is the inlet path has been described. However, the gas flow path in the present invention may be an outlet path for extracting gas from the valve chamber. For example, when applied to the above-described residual pressure holding valve, an inlet passage, a valve chamber, and an outlet passage are formed in order in the housing, and a pressure receiving chamber is formed on one side of a valve member inserted into the valve chamber. The valve seat may be formed in the vicinity of the opening end of the outlet passage. In this case, when the pressure difference between the internal pressure of the pressure receiving chamber communicating with the outlet passage and the gas pressure flowing into the valve chamber from the inlet passage decreases below a predetermined pressure difference, the valve member is pressed toward the opening end side. And switched to the closed position.

  In the above embodiment, since the housing is configured as a unit by the first housing member and the second housing member, there is an advantage that the housing can be easily incorporated simply by forming a mounting hole in the container valve or the like. However, in the present invention, the housing of the valve device can be formed integrally with the main body housing of the container valve.

  For example, in the modification shown in FIG. 3, the first housing (6a) of the check valve (1) is formed integrally with the main body housing (3) of the container valve (2), and the first housing (6a) and A housing (6) of the check valve (1) is constituted by the bottomed cylindrical second housing (6b) fixed by screwing. In this modification, the gas filling path (5) is directly connected to the valve chamber (8), and therefore the gas filling path (5) also serves as the outlet path (9) of the check valve (1). . The valve member (16) is provided with a communicating passage (20). The pressure receiving chamber (19) formed on one side of the valve member (16) is connected to the communicating passage (20) and the valve chamber (8). Are communicated with the gas filling path (5) through the above. Other configurations are the same as those in the above-described embodiment and operate in the same manner, and thus description thereof is omitted.

  In the above embodiment, the first seal portion is configured by an O-ring, and the second seal portion and the second valve seat are configured in a metal seal structure. However, the present invention is not limited to these seal structures. For example, the second seal portion and the second valve seat are formed by forming the second valve seat in an annular step portion and the second seal portion on an inclined surface. Alternatively, either one of the second valve seat and the second seal portion can be formed of a rubber elastic material.

  Moreover, although the case where it applied to the non-return valve integrated in the container valve was demonstrated in said embodiment, this invention is applicable also to valve apparatuses other than a container valve, such as a piping valve, Furthermore, valves other than a one-way valve Needless to say, the present invention can also be applied to an apparatus.

  Since the valve device of the present invention can reliably shut off the flow path by switching to the closed posture and can perform a good closing operation over a long period of time, such as a check valve and a residual pressure holding valve incorporated in a container valve, etc. Although it is preferably used for a one-way valve, it can also be suitably used for other types of valve devices.

It is sectional drawing of the non-return valve at the time of gas consumption which shows embodiment of this invention. It is sectional drawing of the non-return valve at the time of gas filling of embodiment of this invention. It is sectional drawing of the non-return valve at the time of gas consumption which shows the modification of this invention. FIG. 4 (a) is a cross-sectional view when the stored gas pressure is high, and FIG. 4 (b) is a cross-sectional view when the stored gas pressure is lowered. It is sectional drawing of the non-return valve at the time of gas filling which shows a prior art.

Explanation of symbols

1… Valve device (check valve)
6 ... Housing 7 ... Gas channel (inlet channel)
7a: Open end of the valve chamber (8) side 8: Valve chamber
11 ... 1st valve seat
12 ... Second valve seat
13 ... Valve seat
16… Valve member
21 ... 1st seal part
22 ... Second seal part
23 ... Seal part X ... Closed position Y ... Open position

Claims (4)

A gas passage (7) and a valve chamber (8) are provided in the housing (6), and a valve seat (13) is provided in the vicinity of the opening end (7a) of the gas passage (7) opening in the valve chamber (8). The valve member (16) is inserted into the valve chamber (8) so as to be movable back and forth with respect to the valve seat (13), and a seal portion (23) is provided in the valve member (16). (16): a closed posture (X) in which the seal portion (23) abuts against the valve seat (13) in a tight manner, and an open posture in which the seal portion (23) is separated from the valve seat (13) ( Y), and a valve device configured to be switchable to
A first valve seat (11) formed on the inner peripheral surface of the gas flow path (7), and a second valve seat (12) formed so as to surround the open end (7a). Consisting of
The seal portion (23) is inserted into the gas flow path (7) and slidably contacted with the first valve seat (11), and the valve member (16). And a second seal portion (22) that comes into close contact with the second valve seat (12) by advancing toward the open end (7a).   The valve device according to claim 1, wherein both the second valve seat (12) and the second seal portion (22) are made of a metal material.   The valve device according to claim 2, wherein a seal surface width when the second valve seat (12) and the second seal portion (22) are in contact with each other is set to 1 mm or less.   The said 2nd valve seat (12) was formed in the inclined surface extended outward toward said valve chamber (8) from said opening end (7a), The any one of Claim 1 to 3 characterized by the above-mentioned. Valve device.

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