JP4344225B2 - Pressure reducing valve for high pressure gas container - Google Patents

Description

  The present invention relates to a pressure reducing valve for a high pressure gas container used when taking out gas from the high pressure gas container.

  Conventionally, for example, when storing gas such as hydrogen gas used in a fuel cell system, a high-pressure gas container containing a gas compressed to a high pressure is used. And when taking out gas from this high pressure gas container, it decompresses to a desired pressure via the pressure-reducing valve, and takes out the gas which has been filled.

Here, the gas in the container is filled to an extremely high pressure (for example, about 70 MPa) in order to increase the gas loading amount, and the pressure is reduced with high accuracy to a desired secondary pressure value by one pressure reduction. I can't. For this reason, the pressure is reduced twice and the gas pressure value can be set with high accuracy to the secondary pressure value by the second-stage pressure reducing mechanism.
As described above, examples of a mechanism for performing pressure reduction twice include the following documents.
JP 2000-257797.

  However, the conventional pressure reducing mechanism needs to be provided with a supply path for supplying gas from the high pressure gas container to the pressure reducing mechanism. When the gas is a fuel gas, the shorter the path of such a high-pressure gas, the higher the safety, assuming that the path is damaged by an external impact such as an accident. Patent Document 1 describes a mechanism in which two pressure reducing valves are integrated in a container valve. As described above, when the two-stage decompression mechanism is integrated and used for decompressing the high-pressure gas, there are the following problems.

Since the high-pressure gas is depressurized, the frequency of the valve body increases, and the load applied to each component due to the vibration increases. Further, since the pressure is reduced by two stages, there are two valve bodies, and the addition applied to the entire pressure reducing mechanism is increased by the vibration generated from the two vibration sources. For this reason, breakage of components and the like is likely to occur, and the frequency of occurrence of failures has increased.
An object of the present invention is to provide a two-stage pressure reducing valve that is a pressure reducing valve for high-pressure gas and can be used for a longer period of time.

The above object is achieved by the present invention described below.
(1) A pressure reducing valve attached to a lid of a high pressure gas container,
A first valve chamber formed in the lid;
A first valve seat formed in the first valve chamber;
A first flow path communicating the opening of the first valve seat and the inside of the container;
A first valve body capable of reciprocating between a closed position in which the first valve seat is closed and an open position away from the first valve seat while maintaining airtightness in the first valve chamber;
A first urging member for urging the first valve body toward the open position;
A first decompression chamber that communicates with the first valve chamber and is located downstream of the first valve chamber;
A second flow path communicating with the second valve chamber of the first decompression chamber;
A second valve seat formed in the second valve chamber and having an opening in the second flow path;
A second valve body capable of reciprocating between a closed position in which the second valve seat is closed and an open position away from the second valve seat while maintaining airtightness in the second valve chamber;
A second urging member for urging the second valve body toward the open position;
A second decompression chamber that communicates with the second valve chamber and is located downstream of the second valve chamber;
A first valve body, a first urging member, a second valve body, and a main body that houses the second urging member,
The first valve body, the second valve body, and the main body are formed in a rotating body shape, and the respective central axes are located on the same axis line,
The first valve body and second valve body, the high pressure gas container pressure reducing valve which reciprocates in the same axis.

(2) The first valve body has a flow passage communicating the first valve chamber and the first decompression chamber, and the second valve body has a flow passage communicating the second valve chamber and the second decompression chamber, respectively. The pressure reducing valve for a high-pressure gas container according to (1) above .

(3) The pressure reducing valve for a high-pressure gas container according to (1) or (2) , wherein the natural frequency of the lid, the first valve body, the second valve body, and the main body is different.

(4) It has a discharge port communicating with the second decompression chamber, and the discharge port is located on an axis line where the first valve body and the second valve body are arranged, and is connected to the discharge port. The decompression valve for a high-pressure gas container according to any one of (1) to (3) , wherein an axis is parallel to the axis.

According to the first aspect of the present invention, since the two valve bodies vibrate on the same axis, it is possible to suppress an increase in load applied to the entire mechanism due to two vibration sources. In particular, when depressurizing the high-pressure gas, the impact caused by the generated vibration becomes excessive, but an increase in load applied to the entire mechanism can be sufficiently suppressed against such vibration of the valve body. Further, since the lid of the high-pressure gas container is a constituent element, the installation space can be further reduced. In addition, each member is formed in the shape of a rotating body, and the direction of vibration is the axial direction of the rotating body. Therefore, the vibration is transmitted uniformly from the center of the rotating body to the outside, resulting in partial stress concentration. Can be relaxed.

According to the second aspect of the present invention, the pressure reducing valve can be downsized by providing the flow passage in the valve body.

According to the third aspect of the present invention, since the natural frequencies of the respective members are different from each other, resonance is suppressed, and damage due to resonance of each member can be prevented.
According to invention of Claim 4 , a discharge port is located on the axis line of a 1st valve body and a 2nd valve body, and the axis line of piping connected to this discharge port is a 1st valve body and a 2nd valve. Since it matches the axis of the body, the direction of vibration transmitted to the pipe becomes the axial direction, and the occurrence of bending of the pipe due to vibration can be suppressed.

  Hereinafter, a pressure reducing valve according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional side view of a pressure reducing valve 1 of the present invention. The pressure reducing valve 1 is loaded in a high-pressure gas container. The high-pressure gas container has a lid 2, a main body B, a first valve body 5 housed in the main body B, a spring 6, and a second valve body 7. And a spring 8. The lid body 2 has a threaded portion 21 for being screwed into the high-pressure gas container on the outer surface, and further, one end opens into the high-pressure gas container and the other end opens to the outside of the high-pressure gas container. 22. A female screw part 231 for connecting an in-tank device or the like and a female screw part 232 for screwing a shut-off valve are formed at both ends of the discharge passage 22.

  A connecting portion 24 to which the main body 3 of the pressure reducing valve 3 is connected protrudes from the side surface of the lid 2, and a male screw portion 243 for connecting the main body B is formed on the peripheral surface. A first valve chamber 241 is formed at the center of the connection portion 24, and a spring storage portion 242 for storing a spring around the first valve chamber 241 is formed concentrically with the first valve chamber 241. A first valve seat 244 is formed at the bottom of the first valve chamber 241, and an opening 251 in which one end of the first flow path 25 opens is formed at the center of the first valve seat 244. The other end of the first flow path 25 opens into the discharge passage 22, and the high pressure gas (primary pressure gas) in the high pressure gas container flows into the first valve chamber 241 through the first flow path 25. It has a configuration.

  The main body B includes a first member 3 that is connected to the lid body 2 and that houses the first valve body 5, and a second member 4 that is connected to the first member 3 and houses the second valve body 7. . The 1st member 3 is formed in the cylinder shape which is a rotary body shape, and the internal thread part 31 is formed in the internal peripheral surface of the front-end | tip. A second valve chamber 32 is formed at the center of the rear end of the first member 3, and a spring storage portion 33 for storing a spring around the second valve chamber 32 is concentrically with the second valve chamber 32. Is formed. A male thread portion 37 for screwing the second member 4 is formed on the outer peripheral surface of the rear end portion of the first member 3.

  A second valve seat 34 is formed at the bottom of the second valve chamber 32, and an opening 351 is formed at the center of the second valve seat 34. On the opposite side of the second valve chamber 32, a valve body storage portion 36 that stores the rear end portion of the first valve body 5 is formed, and between the valve body storage portion 36 and the second valve chamber 32, A second flow path 35 is formed. The opening of the second flow path 35 on the second valve chamber 32 side is an opening 351.

  In the internal space formed by the connecting portion 241 and the first member 3, the first valve body 5 and the first spring 6 as the first urging member are housed. The first valve body 5 is formed in a rotating body shape, the front end portion 51 is inserted into the first valve chamber 241, and the rear end portion 52 is stored in the valve body storage portion 36. An O-ring 53 is interposed between the inner wall of the first valve chamber 241 and the outer peripheral surface of the first valve body 5, and the first valve body is maintained while maintaining the airtight state of the first valve chamber 241. 5 is configured to reciprocate in the axial direction. The rear end surface 521 of the first valve body 5 and the valve body storage part 36 constitute a first decompression chamber. Further, an O-ring 54 is inserted between the inner wall of the valve body storage portion 36 and the outer peripheral surface of the first valve body 5, and the first valve body 5 is pivoted while maintaining the first decompression chamber airtight. It is configured to be able to reciprocate in the direction. A flange 55 is formed on the outer peripheral surface of the first valve body 5, and a compressed spring 6 is inserted between the flange 55 and the spring storage portion 242.

The first valve body 5 is reciprocated between a closed position where the front end surface 511 is pressed against the first valve seat 244 and stops outflow of gas, and an open position where the front end surface 511 is separated from the first valve seat 244. It is configured to be movable. The spring 6 biases the first valve body toward the open position. Since the volume of the space in which the spring 6 is accommodated is changed by the movement of the first valve body 5, the air holes 37 are provided in the first space so that the pressure in the space is constant and the movement of the first valve body 5 is not hindered. It is formed on the side surface of the member 3.
A flow passage 56 is formed at the center of the first valve body 5 along the axis O. The front end of the flow passage 56 opens to the side surface of the front end portion 51, and the rear end opens to the center of the rear end surface 521. . The first valve chamber 241 communicates with the first decompression chamber via the flow passage 56.

  The 2nd member 4 is formed in the cylinder shape which is a rotary body shape, and the internal thread part 41 is formed in the internal peripheral surface of the front-end | tip. A discharge port 42 is formed at the center of the rear end of the second member 4, and a valve body storage portion 43 is formed inside thereof. A female screw portion 421 is formed on the inner periphery of the discharge port 42, and the axis of the female screw portion 421 is the same as the axis O common to the first valve body 5 and the second valve body 7. With such a configuration, the pipe 9 screwed into the female screw portion 421 has the same axis as the axis O common to the first valve body 5 and the second valve body 7. Thereby, the vibration produced by the action | operation of the 1st valve body 5 and the 2nd valve body 7 turns into a vibration which reciprocates to an axial direction with respect to piping. If the pipe is subjected to vibration that moves backward in the direction perpendicular to its axis, the vibration will cause significant deflection, which may cause loosening and disconnection of the connection part. The occurrence of inconvenience is suppressed.

  In an internal space formed by the first member 3 and the second member 4, a second valve body 7 and a second spring 8 which is a second urging member are housed. The second valve body 7 is formed in a rotating body shape, the front end portion 71 is inserted into the second valve chamber 32, and the rear end portion 72 is stored in the valve body storage portion 43. An O-ring 73 is inserted between the inner wall of the second valve chamber 32 and the outer peripheral surface of the second valve body 7, and the second valve body 32 is maintained while maintaining the airtight state of the second valve chamber 32. 7 is configured to be capable of reciprocating in the axial direction. The rear end surface 721 of the second valve body 7 and the valve body storage portion 43 constitute a second decompression chamber. A flange 75 is formed on the outer peripheral surface of the rear end of the second valve body 7, and a compressed spring 8 is inserted between the flange 75 and the spring storage portion 33. Further, an O-ring 74 is inserted between the inner wall of the valve body storage portion 43 and the peripheral end surface of the flange 75, and the second valve body 7 reciprocates in the axial direction while maintaining the second decompression chamber airtight. It is configured to be possible.

The second valve body 7 is reciprocated between a closed position where the front end surface 711 is pressed against the second valve seat 34 to stop the outflow of gas and an open position where the front end surface 711 is separated from the second valve seat 34. It is configured to be movable. The spring 8 biases the second valve body 7 toward the open position. Since the volume of the space in which the spring 8 is accommodated is changed by the movement of the second valve body 7, the vent hole 44 is provided in the second hole so that the pressure in the space is constant and the movement of the second valve body 7 is not hindered. It is formed on the side surface of the member 4.
A flow passage 76 is formed at the center of the second valve body 7 along the axis O. The front end of the flow passage 76 opens to the side surface of the front end portion 71, and the rear end opens to the center of the rear end surface 721. . The second valve chamber 32 communicates with the second decompression chamber via the flow passage 76.

The pressure reducing valve 1 of the present invention configured as described above has a valve body between a closed position and an open position by balancing the urging force of the spring and the force applied to the valve body by the gas pressure in the pressure reducing chamber. By reciprocating (vibrating) at high speed, the pressure (primary pressure) in the high-pressure gas container is reduced to the secondary pressure in the first decompression chamber by the movement of the first valve body 5, and the second valve body In the same manner, the pressure is reduced to the tertiary pressure in the second pressure reducing chamber. Such a pressure reducing valve for a high-pressure gas container of the present invention has a tertiary pressure with higher accuracy even when the gas pressure in the high-pressure gas container is a high pressure value such as in the range of 30 MPa to 80 MPa. Can be set to the pressure value (the pressure value when the gas is finally used).
A flow passage 56 that communicates the first valve chamber 241 and the first decompression chamber is formed in the first valve body 5, and similarly, the flow passage 76 is also formed in the second valve body 7. As a result, the overall size of the pressure reducing valve 1 can be reduced.

  Here, since the 1st valve body 5 and the 2nd valve body 7 are arrange | positioned on the same axis line O, the direction of vibration is also the same. Therefore, the vibration applied to the entire pressure reducing valve mechanism including the valve body is in the same direction. In addition, each member has a rotating body shape and is configured by combining them in series in the axial direction. Further, since the vibration direction is along the axial direction, the stress due to vibration applied to each member is uniformly distributed. And partial stress concentration is eased. In other words, the valve bodies 5 and 7 and the main body B have a rotating body shape, and a vibration load is applied in the axial direction having the highest strength against the load. The durability against load is further improved. Further, although there are two vibration sources (valve bodies), the vibration directions are matched, so that sufficient durability against the load can be obtained as compared with the case where two vibrations are applied simultaneously from different directions.

  The first flow path 25, the first valve chamber 241, the flow passage 56 of the first valve body 5, the flow passage 76 of the second valve body 7, and the discharge port 42 are all the first valve body 5 and the second valve. The axis of the body 7 is located on the same axis O, and each part is in the shape of a rotating body, and the axis of each part is located on the same axis O. In this way, by disposing each component on the same axis O and further matching the gas flow path with this axis O, the durability against vibration is improved and the miniaturization is realized.

In particular, the external appearance of the main body B formed in a small size is a rotating body shape, and the first flow path 25 and the discharge port 42 are provided at both ends located on the axis O, so that the piping path There is an advantage that it can be provided as a part and integrated with the piping, and does not take up a layout space.
Moreover, since the first and second members 3 and 4 and the lid body 2 constituting the two valve bodies and the main body B have different natural frequencies, damage to the members due to resonance can be suppressed.

It is a cross-sectional side view of the pressure reducing valve of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 2 Cover body 24 Connection part 241 1st valve chamber 32 2nd valve chamber 5 1st valve body 6 1st spring 7 2nd valve body 8 2nd spring

Claims (4)

A pressure reducing valve attached to the lid of the high pressure gas container,
A first valve chamber formed in the lid;
A first valve seat formed in the first valve chamber;
A first flow path communicating the opening of the first valve seat and the inside of the container;
A first valve body capable of reciprocating between a closed position in which the first valve seat is closed and an open position away from the first valve seat while maintaining airtightness in the first valve chamber;
A first urging member for urging the first valve body toward the open position;
A first decompression chamber that communicates with the first valve chamber and is located downstream of the first valve chamber;
A second flow path communicating with the second valve chamber of the first decompression chamber;
A second valve seat formed in the second valve chamber and having an opening in the second flow path;
A second valve body capable of reciprocating between a closed position in which the second valve seat is closed and an open position away from the second valve seat while maintaining airtightness in the second valve chamber;
A second urging member for urging the second valve body toward the open position;
A second decompression chamber that communicates with the second valve chamber and is located downstream of the second valve chamber;
A first valve body, a first urging member, a second valve body, and a main body that houses the second urging member,
The first valve body, the second valve body, and the main body are formed in a rotating body shape, and the respective central axes are located on the same axis line,
The first valve body and second valve body, the high pressure gas container pressure reducing valve which reciprocates in the same axis. The first valve body has a flow passage that communicates the first valve chamber and the first decompression chamber, and the second valve body has a flow passage that communicates the second valve chamber and the second decompression chamber. The pressure reducing valve for a high pressure gas container according to claim 1 . The pressure reducing valve for a high-pressure gas container according to claim 1 or 2 , wherein the natural frequency of the lid body, the first valve body, the second valve body, and the main body is different. The exhaust port communicated with the second decompression chamber, the exhaust port is located on the axis line where the first valve body and the second valve body are disposed, and the axis of the pipe connected to the exhaust port is The pressure reducing valve for a high pressure gas container according to any one of claims 1 to 3, wherein the pressure reducing valve is parallel to the axis.

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