JP4898128B2 - Overflow prevention valve - Google Patents

Description

  The present invention relates to an overflow prevention valve that shuts off the gas extraction path to prevent an excessive gas outflow when a large amount of consumed gas flows out due to damage to a pipe connected to the gas extraction path. In addition, the present invention relates to an overflow prevention valve that can reliably shut off a gas extraction path at the time of excessive outflow and that can set an extraction flow rate precisely during normal times.

  In recent years, development of vehicles using hydrogen gas as fuel with little environmental pollution has been underway. The hydrogen gas storage container is desired to have a large capacity and a small size, and accordingly, the storage gas pressure is also required to be increased to a high pressure such as 70 MPa.

The flow rate taken out from the gas storage container increases to a predetermined amount or more when an abnormality such as gas leakage from the pipe occurs. Therefore, the gas extraction path from the gas storage container is usually provided with an overflow prevention valve, for example, on the container valve, and when the extraction flow rate increases abnormally, the overflow prevention valve is closed and the gas extraction path is shut off. Is configured to do.
Conventionally, as an overflow prevention valve that shuts off the gas extraction path when the extraction flow rate increases abnormally, an overflow prevention member is inserted into the overflow prevention valve chamber, and this overflow prevention member is overpressured by a valve opening spring. There is an overflow prevention valve configured to be switchable between a valve opening posture separated from the flow prevention valve seat and a valve closing posture brought into contact with the overflow prevention valve seat as the take-off flow rate increases (Patent Document 1). reference).

  That is, for example, as shown in FIG. 10, this overflow prevention valve (50) is provided with an inlet passage (52), an overflow prevention valve chamber (53), and an outlet passage (54) in the housing (51) in this order. A gas extraction passage (60) is formed, an overflow prevention valve seat (55) is formed in the overflow prevention valve chamber (53), and an overflow prevention member (56) is installed in the overflow prevention valve chamber (53). The overflow prevention member (56) is inserted and elastically pressed by a valve opening spring (57) in the valve opening direction away from the overflow prevention valve seat (55).

  In the normal state, the above-described overflow prevention member (56) is elastically pressed by the valve opening spring (57) and is separated from the overflow prevention valve seat (55) by a predetermined dimension. Therefore, when the stored gas is taken out from the gas storage container (58) through the gas extraction path (60), the gap between the overflow prevention member (56) and the overflow prevention valve seat (55) or the overflow prevention member (56) A predetermined flow rate of gas passing through the gap between the return push rod (59) at the tip and the inner surface of the outlet channel (54) is taken out.

  On the other hand, if an overflow occurs at the time of taking out the gas, the internal pressure of the outlet passage (54) is lower than a predetermined differential pressure compared to the internal pressure of the inlet passage (52). The prevention member (56) abuts against the overflow prevention valve seat (55) against the elastic force of the valve opening spring (57), thereby blocking the gas extraction path (60).

JP 2003-314798 A

In general, in the above-described overflow prevention valve, the gas flow rate taken out via the overflow prevention valve is determined by the opening area and the shape of the smallest opening circulation portion having the smallest opening area in the gas extraction path in the valve opening posture. Is done. In particular, in the case of a gas having a small molecular weight such as hydrogen gas, the flow rate varies greatly depending on the slight difference in the opening area of the minimum opening circulation portion and the opening shape.
However, in the conventional overflow prevention valve, the minimum gap between the two members, such as the gap between the overflow prevention member and the overflow prevention valve seat, and the gap between the return push rod and the inner surface of the outlet passage, are used. Since the opening circulation part is formed, it is easy to make the opening area and its opening shape precise and constant due to errors due to accumulation of dimensional tolerances of both members and misalignment between the return push rod and the outlet path. However, there is a problem that the flow rate taken out from the overflow prevention valve varies.

  The technical problem of the present invention is to provide an overflow prevention valve that solves the above-mentioned problems and can reliably set the extraction flow rate in normal times while being able to reliably shut off the gas extraction path at the time of excessive outflow. .

In order to solve the above problems, the present invention will be described with reference to FIGS. 1 to 9, for example, illustrating an embodiment of the present invention. The overflow prevention valve is configured as follows.
That is, according to the present invention, the above-described overflow prevention is formed by forming in the housing (4) a gas extraction passage (18) comprising an inlet passage (5), an overflow prevention valve chamber (6) and an outlet passage (7) in this order. An overflow prevention valve seat (8) is formed in the valve chamber (6), and an overflow prevention member (14) is formed in the overflow prevention valve chamber (6). A valve-opening posture (Y) inserted so as to be capable of contacting and separating, and the above-mentioned overflow prevention member (14) is elastically pressed by a valve-opening spring (15) and separated from the above-mentioned overflow prevention valve seat (8); The above-described overflow prevention against the elastic pressure of the valve-opening spring (15) due to the differential pressure between the internal pressure of the inlet passage (5) and the internal pressure of the outlet passage (7) which has decreased to a predetermined pressure or more. An overflow prevention valve configured to be switchable to a valve closing posture (X) in contact with a valve seat (8), wherein the overflow prevention valve chamber is provided in the overflow prevention member (14). (6) A communication passage (16) that communicates with the inlet passage (5) or the outlet passage (7) is formed, and upstream of the communication passage (16). Between the opening (16a) and the downstream opening (16b), the outer surface of the overflow prevention member (14) is connected to the overflow prevention valve chamber (6), the inlet passage (5), and the outlet passage (7). A gas-sending passage (20) is formed on one of the inner surfaces of the gas inlet and the outlet passage (7) in the valve-opening posture (Y). 18), the smallest opening circulation part (19) having the smallest opening area is provided in the communication path (16).

  When taking out the stored gas through the inlet passage, the overflow prevention valve chamber and the outlet passage in order, the overflow prevention member is normally pressed by the valve opening spring and separated from the overflow prevention valve seat. The taken-out gas flowing in from the inlet passage is taken out from the outlet passage through the overflow prevention valve chamber. At this time, since the extracted gas passes through the minimum opening flow passage of the communication passage, it is not affected by the gap between the overflow prevention member and the overflow prevention valve seat or the inner surface of the outlet passage, and the minimum opening flow portion It is taken out at a gas flow rate corresponding to the opening area and the opening shape. At this time, since the minimum opening circulation portion is formed in the overflow prevention member by, for example, drilling or the like, there is no accumulation of dimensional tolerances, and a specific opening shape such as a circular cross section is also used. Therefore, the extracted gas passing through the minimum opening circulation portion is precisely set to a flow rate according to the opening area and the opening shape.

  On the other hand, if an overflow occurs when the gas is taken out, the internal pressure of the outlet passage is reduced to a predetermined differential pressure or more compared to the internal pressure of the inlet passage. It moves to the overflow prevention valve seat side against the elastic pressure, and comes into contact with the overflow prevention valve seat to shut off the gas extraction path.

  The above-described communication path only needs to be formed in the overflow prevention member so that the overflow prevention valve chamber communicates with the inlet passage or the outlet passage, and can be processed by any method. Note that a plurality of upstream openings and downstream openings of the communication path may be provided.

The above-described overflow prevention member does not form a minimum opening flow part between the overflow prevention valve seat and the inner surface of the outlet passage, and therefore can be formed widely between them. And can be filled with fresh gas efficiently.
That is, a filling path that connects the overflow prevention valve chamber and the gas storage container is formed in the housing, and gas flow from the overflow prevention valve chamber to the gas storage container is allowed in the filling path. However, if a check valve is provided to block the flow of gas from the gas storage container to the overflow prevention valve chamber, the flow from the outlet passage to the gas storage container through the overflow prevention valve chamber and the filling passage Since the minimum opening flow part is not formed between them, the fresh gas can be efficiently filled into the gas storage container. Therefore, the structure of the entire valve can be simplified by using the gas outlet provided downstream of the outlet passage as a filling port. .

The above-described overflow prevention valve chamber may be formed directly in the housing, or a check valve may be provided between the inlet passage and the outlet passage and formed in the check member of the check valve. Good.
That is, a check valve chamber is formed between the inlet passage and the downstream portion of the outlet passage, a check member is inserted into the check valve chamber, and the check member reverses from the downstream portion of the outlet passage. The flow of gas to the check valve chamber is allowed, but the flow of gas from the check valve chamber to the downstream portion of the outlet passage is blocked, and the above-described overflow prevention valve chamber and the upstream portion of the outlet passage are placed in the check member. The upstream portion of the outlet passage is always communicated with the downstream portion of the outlet passage, and the seal sliding portion is connected to any one of the overflow prevention valve chamber, the inlet passage, and the upstream portion of the outlet passage. It can form between the inner surface of this and the outer surface of said overflow prevention member.

  In this case, in the normal time when the gas is taken out, the gas flow from the check valve chamber to the downstream portion of the outlet passage is blocked by the check member. Since the downstream portion of the passage is always in communication, the gas set at a predetermined flow rate is taken out from the downstream portion of the outlet passage through the minimum opening circulation portion.

  In the housing, it is possible to form a filling passage that connects the check valve chamber and the gas storage container in communication with each other, whereby the check valve chamber and the filling passage are sequentially formed from the downstream portion of the outlet passage. As a result, the fresh gas can be efficiently filled into the gas storage container.

  Further, a filling passage that communicates the check valve chamber and the inlet passage may be formed in the check valve chamber. In this case, fresh gas can be filled into the gas storage container through the inlet passage. In addition, it is not necessary to form a filling path different from the inlet path in the housing, and the structure of the entire valve can be simplified.

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

  (1) If an overflow occurs during gas extraction, the internal pressure of the outlet passage will drop below a predetermined differential pressure compared to the internal pressure of the inlet passage, and the overpressure prevention member will resist the spring pressure of the valve opening spring. The gas take-out path can be reliably shut off because it moves and contacts the overflow prevention valve seat.

  (2) The above-described overflow prevention member is normally pressed by a valve-opening spring and is separated from the overflow prevention valve seat, and a minimum opening flow portion is formed in the communication path in the overflow prevention member. Therefore, the gas taken out from the overflow prevention valve can be taken out at a flow rate corresponding to the minimum opening circulation portion without being affected by the gap between the overflow prevention member and the overflow prevention valve seat or the inner surface of the outlet passage. it can. At this time, since the minimum opening circulation portion is formed in the communication passage in the above-described overflow prevention member, it can be accurately formed in an opening cross section having a small dimensional error and having a predetermined shape. The gas extraction can be precisely set to an extraction flow rate corresponding to the opening area and the opening shape of the minimum opening circulation portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view of an overflow prevention valve in a normally open valve posture, and FIG. 2 is an overflow prevention in a valve closing posture at the time of excessive outflow. It is sectional drawing of a valve.

  As shown in FIG. 1, this overflow prevention valve (1) is incorporated in a container valve (3) attached to a gas storage container (2), and an inlet passage (5) and an excess passage are formed in the housing (4). A gas extraction passage (18) is formed which is provided with a flow prevention valve chamber (6) and an outlet passage (7) in this order. An overflow prevention valve seat (8) is formed around the opening of the outlet passage (7) facing the overflow prevention valve chamber (6). The inlet channel (5) communicates with the gas storage container (2), and the outlet channel (7) passes through the shut-off valve chamber (10) of the shut-off valve (9) and the gas outlet (11 ).

  In the housing (4), a filling passage (12) for communicating the overflow prevention valve chamber (6) and the gas storage container (2) is formed. In this filling channel (12), gas flow from the overflow prevention valve chamber (6) to the gas storage container (2) is allowed, but from the gas storage container (2) to the overflow prevention valve chamber (6). A check valve (13) for preventing the gas flow is provided.

An overflow prevention member (14) is inserted into the overflow prevention valve chamber (6) so as to be able to contact and separate from the overflow prevention valve seat (8). This overflow prevention member (14) is elastically pressed in the valve opening direction by a valve opening spring (15) mounted in the overflow prevention valve chamber (6). Due to the elastic pressure of the valve opening spring (15), the overflow prevention member (6) is switched to the valve opening posture (Y) separated from the overflow prevention valve seat (8).
The overflow prevention member (8) resists the elastic pressure of the valve-opening spring (15) when the internal pressure of the outlet passage (7) falls below a predetermined differential pressure compared to the internal pressure of the inlet passage (5). Then, it moves to the outlet passage (7) side, and as shown in FIG. 2, it is switched to the valve closing posture (X) in contact with the above-described overflow prevention valve seat (8).

  A communication passage (16) that connects the overflow prevention valve chamber (6) and the inlet passage (5) to each other is formed inside the overflow prevention member (14). As shown in FIG. 1, this communicating path (16) has a small diameter portion communicating with the inlet passage (5) through the filter (17), and this portion is the inlet in the valve opening posture (Y). In the gas extraction path (18) from the path (5) to the outlet path (7), it is the smallest opening flow section (19) having the smallest opening area. Further, between the upstream opening (16a) and the downstream opening (16b) of the communication path (16), the outer surface of the overflow preventing member (14) is sealed to the inner surface of the overflow preventing valve chamber (6). A tight sliding portion (20) that slides is formed.

  On the end face of the overflow preventing member (14) facing the outlet passage (7), a return push rod (21) is projected so as to be inserted into the outlet passage (7). When the return push rod (21) is in the valve closing posture (X) shown in FIG. 2, the tip of the return push rod (21) enters the valve closing chamber (10). It faces the closing member (22).

Next, based on FIG. 1 and FIG. 2, operation | movement of said overflow prevention valve is demonstrated.
(1) At the time of gas extraction at normal time As shown in FIG. 1, the overflow prevention member (14) is elastically pressed by the valve opening spring (15) and is separated from the overflow prevention valve seat (8). The valve opening posture (Y) is maintained.
When the closing member (22) of the closing valve (9) is opened, the stored gas in the gas storage container (2) flows into the inlet passage (5), the overflow prevention valve chamber (6), the outlet passage (7), and the closing valve. It passes through the chamber (10) and is taken out from the gas outlet (11). At this time, since the outer surface of the overflow prevention member (14) is in close contact with the inner surface of the overflow prevention valve chamber (6) in the above-described sealing sliding portion (20), the overflow flows from the inlet passage (5). The extracted gas flowing into the prevention valve chamber (6) inevitably passes through the minimum opening flow portion (19) of the communication passage (16). Thereby, the extraction of the stored gas is precisely controlled to a flow rate according to the opening area and the opening shape of the minimum opening circulation portion (19).

(2) Gas filling When filling the gas storage container (2) with a gas, a filling device (not shown) is connected to the gas outlet (11), and the closing valve (9) is opened. Since the above-described overflow prevention member (14) is separated from the overflow prevention valve seat (8), the fresh gas passes through the closing valve chamber (10) and the outlet passage (7) in order, and the overflow prevention valve chamber ( 6) flows into the gas storage container (2) from the filling passage (12) through the check valve (13).
At this time, the overflow prevention valve chamber (6) communicates with the gas storage container (2) through the communication passage (16) and the inlet passage (5). It also flows from the channel (5) into the gas storage container (2). However, since the opening area between the overflow prevention member (14) and the overflow prevention valve seat (8) and the filling passage (12) is wider than the minimum opening flow part (19), most of the fresh gas is present. Is smoothly circulated through the filling path (12) and quickly filled into the gas storage container (2).

(3) When overflow occurs During normal gas extraction, the flow rate of the extraction gas flowing into the overflow prevention valve chamber is set to a predetermined flow rate according to the opening area of the minimum opening circulation portion. ing. For this reason, if gas leaks from the overflow prevention valve chamber (6) through the outlet passage (7), such as when a gas leak occurs in the piping with the gas consuming device, the outlet passage (7) The internal pressure is greatly reduced compared to the internal pressure in the inlet channel (5). When a differential pressure of more than a predetermined value is generated between the two, the overflow prevention member (14) in the gas extraction posture (Y) resists the elastic pressure of the valve opening spring (15) by the differential pressure. The valve moves in the valve closing direction, and as shown in FIG. 2, the valve is switched to the valve closing posture (X) in contact with the overflow prevention valve seat (8). As a result, the overflow prevention valve chamber (6) is blocked by the overflow prevention member (14), and the removal of the stored gas from the gas storage container (2) is stopped.

  As shown in FIG. 2, in the above-mentioned valve closing posture (X), the tip of the return push rod (21) provided on the overflow prevention member (14) has entered the above-mentioned closing valve chamber (10). Yes. Therefore, when the closing member (22) is closed, the return push rod (21) is pressed by the closing member (22), and the overflow prevention member (14) is separated from the overflow prevention valve seat (8). As a result, the outlet passage (7), the overflow prevention valve chamber (6), and the inlet passage (5) upstream from the shutoff valve chamber (10) have equal pressure, and the overflow prevention member (14) is opened as described above. The valve spring (15) is returned to the valve opening posture (Y) by the elastic pressure. Then, after the cause of the excessive outflow is resolved, when the shut-off valve (9) is opened, the stored gas in the gas storage container (2) enters the inlet as in the normal state. The gas is taken out from the gas outlet (11) through the passage (5), the communication passage (16), the overflow prevention valve chamber (6), the outlet passage (7) and the closing valve chamber (10) in this order.

  3 to 5 show a second embodiment of the present invention, FIG. 3 is a cross-sectional view of the overflow prevention valve in a normally open position, and FIG. 4 is a cross-sectional view of the overflow prevention valve during filling. 5 is a cross-sectional view of the overflow prevention valve in the valve closing posture at the time of excessive outflow.

In the second embodiment, unlike the first embodiment, the overflow prevention valve (1) is formed in the check member of the check valve (13).
That is, as shown in FIG. 3, in this second embodiment, a check valve chamber (23) is formed between the inlet passage (5) and the downstream portion (7b) of the outlet passage (7). A check member (24) is inserted into the valve chamber (23), and this check member (24) is pressed against the check valve spring (25) in the valve closing direction to contact the check valve seat (26). It is. The check valve chamber (23) is connected to a gas storage container (not shown) through a filling passage (12) formed in the housing (4). A vertical groove (27) is formed on the outer peripheral surface of the check member (24), and the check valve chamber (23) communicates with the inlet passage (5) through the vertical groove (27). is doing.

  The above-mentioned check member (24) resists the elastic pressure of the above-mentioned check spring (25) when high-pressure fresh gas flows into the downstream portion (7b) of the outlet passage when fresh gas is charged. Then, the valve is opened. That is, this check member (24) prevents the flow of gas from the check valve chamber (23) to the outlet passage downstream portion (7b), but from the outlet passage downstream portion (7b) to the check valve chamber (23 Gas flow to) is allowed.

  In the check member (24), an overflow prevention valve chamber (6) and an outlet channel upstream portion (7a) are formed, and the outlet channel upstream portion (7a) is connected to the outlet channel downstream portion. (7b) is always in communication. The overflow prevention valve chamber (6) is formed with an overflow prevention valve seat (8) as in the first embodiment, and the overflow inserted into the overflow prevention valve chamber (8). The prevention member (14), the valve opening spring (15), the communication passage (16), the minimum opening flow portion (19), the seal sliding portion (20), and the like are configured in the same manner as in the first embodiment. .

Next, the operation of the above-described overflow prevention valve will be described with reference to FIGS.
(1) At the time of gas extraction at normal time As shown in FIG. 3, the check member (24) is elastically pressed by the check spring (25) and is in contact with the check valve seat (26). A gas flow from the stop valve chamber (23) to the downstream side of the outlet path (7b) is blocked by the check member (24). On the other hand, the overflow prevention member (14) is elastically pressed by the valve opening spring (15) and is maintained in the valve opening posture (Y) separated from the overflow prevention valve seat (8). The valve chamber (6) communicates with the downstream part (7b) of the outlet channel via the upstream part (7a) of the outlet channel. In this state, when the closing member (22) of the closing valve (9) is opened, the stored gas in the gas storage container is moved into the inlet passage (5), the communication passage (16), the overflow prevention valve chamber (6), and the outlet passage. It is taken out through the flow part (7a), the outlet channel downstream part (7b), and the closing valve chamber (10) in this order. At this time, since the extracted gas inevitably passes through the minimum opening circulation portion (19) of the communication passage (16), the opening area and the opening shape of the minimum opening circulation portion (19) are the same as in the first embodiment. Is precisely set to the flow rate corresponding to

(2) At the time of gas filling When the stop valve (9) is opened and fresh gas is filled from the downstream part (7b) of the outlet passage, the above-mentioned check member (24) becomes the check spring (25) as shown in FIG. Separate from the check valve seat (26) against the elastic pressure of As a result, the fresh gas is filled into the gas storage container (not shown) through the stop valve chamber (10), the outlet passage downstream portion (7b), the check valve chamber (23), and the filling passage (12) in this order. The check valve chamber (23) communicates with the inlet passage (5) through a longitudinal groove (27) formed in the outer peripheral surface of the check member (24), and the upstream portion of the outlet passage. (7a) and the overflow prevention valve chamber (8) communicate with the inlet passage (5), so a part of the fresh gas also flows into the gas storage container from the inlet passage (5). To do. However, since the opening cross section of the filling passage (12) is sufficiently wide, most of the fresh gas flows smoothly through the filling passage (12) and is quickly filled into the gas storage container.

(3) When overflow occurs When the flow rate of the extracted gas increases excessively during normal gas extraction, the internal pressure of the outlet channel (7) becomes the internal pressure of the inlet channel (5) as in the first embodiment. The overflow prevention member (14) is switched to the valve closing posture (X) against the elastic force of the valve opening spring (15) as shown in FIG. As a result, the overflow prevention valve chamber (6) is blocked by the overflow prevention member (14), and the gas extraction is stopped. In this valve closing posture (X), the tip of the return push rod (21) provided on the overflow prevention member (14) has entered the valve closing chamber (10) as in the first embodiment. . Accordingly, as in the first embodiment, when the closing valve (9) is closed, the return push rod (21) is pressed against the closing member (22), and the overflow preventing member (14) is The valve is moved from the seat (8) to the valve opening posture (Y) by the elastic force of the valve opening spring (15). Then, after the cause of the above-described overflow is eliminated, when the above-described closing valve (9) is opened, the extraction gas is extracted in the same manner as in the above-described normal state.

In the second embodiment, the filling path that connects the check valve chamber and the gas storage container is formed in the housing. However, in the present invention, this filling path can be formed in the check valve chamber.
That is, in the modification shown in FIG. 6, filling is performed by a plurality of longitudinal grooves (27) formed on the outer peripheral surface of the check member (24) to communicate the check valve chamber (23) and the inlet passage (5). A path (12) is formed. Since the opening area of the filling passage (12) is sufficiently large, the check member (24) is separated from the check valve seat (26) by the pressure of fresh gas flowing from the downstream portion (7b) of the outlet passage. Then, the fresh gas smoothly flows through the filling passage (12) in the check valve chamber (23) and is quickly filled into the gas storage container from the inlet passage (5).
The other configuration is the same as that of the second embodiment described above, and operates in the same manner, so that the description thereof is omitted.

  7 to 9 show a third embodiment of the present invention, FIG. 7 is a cross-sectional view of the overflow prevention valve in a normally open valve posture, and FIG. 8 is a cross-sectional view of the overflow prevention valve during filling. 9 is a cross-sectional view of the overflow prevention valve in the valve closing posture at the time of excessive outflow.

  As shown in FIG. 7, in the third embodiment, an overflow prevention valve (1) is provided inside the check valve (13) as in the second embodiment, but is different from the second embodiment. Thus, the communication path (16) is formed so that the upstream part (7a) of the outlet path and the overflow prevention valve chamber (6) communicate with each other. The check member (24) is configured to slide in the check valve chamber (23) tightly. Other configurations are the same as those of the second embodiment, and the description thereof is omitted.

However, also in the third embodiment, as in the second embodiment, a vertical groove is formed on the outer peripheral surface of the check member (24), or the filling path of the check member is changed as in the above modification. You may form in an outer peripheral surface.
In the third embodiment and the modification of the second embodiment, when the filling passage (12) is formed in the check valve chamber (23), the shape thereof is a shape other than the vertical groove such as a spiral. Alternatively, as shown by the phantom line in FIG. 7, the check member (24) can be provided inside.
Further, since the valve opening spring (15) is disposed between the overflow preventing member (14) and the check member (24), the elastic force of the valve opening spring (15) is sufficiently large. In this case, the valve opening spring (15) can also be used as the check spring (25).

The above-described overflow prevention valve operates in the same manner as in the second embodiment.
That is, when the gas is taken out in a normal state, as shown in FIG. 7, the check member (24) is elastically pressed by the check spring (25) or the valve opening spring (15) to check the check valve seat (26). On the other hand, the overflow prevention member (14) is maintained in a valve opening posture (Y) separated from the overflow prevention valve seat (8) by being elastically pressed by the valve opening spring (15). ing. When the closing member (22) of the closing valve (9) is opened in this state, the extracted gas is taken into the inlet passage (5), the overflow prevention valve chamber (6), the communication passage (16), and the upstream portion of the outlet passage (7a ), The outlet passage downstream portion (7b), and the closing valve chamber (10) in this order. At this time, the extracted gas inevitably passes through the minimum opening circulation portion (19) of the communication passage (16), so the flow rate is precisely set according to the opening area and the opening shape of the minimum opening circulation portion (19). The

  At the time of gas filling, if the stop valve (9) is opened and fresh gas is filled from the downstream portion (7b) of the outlet passage, the above-mentioned check member (24) is moved to the check spring (25) or open as shown in FIG. Separates from the check valve seat (26) against the elastic force of the valve spring (15). As a result, the fresh gas is quickly filled into the gas storage container (not shown) through the stop valve chamber (10), the outlet passage downstream portion (7b), the check valve chamber (23), and the filling passage (12) in this order. The

  If the flow rate of the extracted gas increases excessively during normal gas extraction, the internal pressure of the outlet passage (7) is greatly reduced compared to the internal pressure of the inlet passage (5). ) Is switched to the valve closing posture (X) shown in FIG. 9 against the elastic force of the valve opening spring (15). As a result, the overflow prevention valve chamber (6) is blocked by the overflow prevention member (14), and the gas extraction is stopped. In this valve closing posture (X), the tip of the return push rod (21) enters the valve closing chamber (10). Accordingly, when the closing valve (9) is closed, the return push rod (21) is pressed by the closing member (22), and the overflow prevention member (14) is separated from the overflow prevention valve seat (8). Then, the valve opening posture (Y) is switched by the elastic force of the valve opening spring (15). Then, after the cause of the above-described overflow is eliminated, when the above-described closing valve (9) is opened, the extraction gas is extracted in the same manner as normal.

  The overflow prevention valve described in each of the above embodiments and modifications is illustrated in order to embody the technical idea of the present invention, and includes an overflow prevention member, a communication path, a minimum opening circulation portion, a seal slide. The shape, structure, arrangement, and the like of the moving part are not limited to these embodiments and the like, and various modifications can be made within the scope of the claims of the present invention. Needless to say, the type is not limited.

  For example, in the first embodiment or the second embodiment, one end of the check member may be inserted into the inlet passage, and the upstream opening of the communication path may be opened in the inlet passage. In this case, the check member and the inlet A coherent sliding portion may be provided between the road inner surface. Similarly, in the third embodiment, it is also possible to open the downstream side opening of the communication passage in the upstream portion of the outlet passage, and provide a coherent sliding portion between the check member and the upstream portion of the outlet passage.

In each of the above embodiments, the gas outlet is also used as the filling port, and the fresh gas is filled through the closing valve chamber. However, in the present invention, a filling port may be provided in addition to the gas outlet, or a filling path can be formed at a position that does not pass through the closing valve chamber, the overflow prevention valve chamber, the check valve chamber, etc. Furthermore, the present invention is not limited to the overflow prevention valve incorporated in the container valve, but can be applied to an overflow prevention valve provided in the middle of the piping.
In each of the embodiments described above, the return push rod is provided on the overflow prevention member and the return operation is performed by the closing member. However, in the present invention, return operation means other than the closing member may be used, and when the overflow prevention member is directly pressed by the return operation means, the return push rod can be omitted.

  The overflow prevention valve of the present invention is capable of accurately setting the extraction flow rate during normal operation while reliably shutting off the gas extraction path at the time of excessive outflow. Although it is suitable, it is also suitably used during other container valves and piping.

It is sectional drawing of the overflow prevention valve in the valve opening attitude | position in normal time which shows 1st Embodiment of this invention. It is sectional drawing of the overflow prevention valve in the valve closing attitude | position at the time of excessive outflow of 1st Embodiment. It is sectional drawing of the overflow prevention valve in the valve opening attitude | position in the normal time which shows 2nd Embodiment of this invention. It is sectional drawing of the overflow prevention valve at the time of filling of 2nd Embodiment. It is sectional drawing of the overflow prevention valve in the valve closing attitude | position at the time of excessive outflow of 2nd Embodiment. It is sectional drawing of the overflow prevention valve which shows the modification of 2nd Embodiment. It is sectional drawing of the overflow prevention valve in the valve opening attitude | position in the normal time which shows 3rd Embodiment of this invention. It is sectional drawing of the overflow prevention valve at the time of filling of 3rd Embodiment. It is sectional drawing of the overflow prevention valve in the valve closing attitude | position at the time of excessive outflow of 3rd Embodiment. It is sectional drawing of the overflow prevention valve which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Overflow prevention valve 2 ... Gas storage container 4 ... Housing 5 ... Inlet passage 6 ... Overflow prevention valve chamber 7 ... Outlet passage
7a… Upstream exit
7b: Downstream part of outlet path 8: Overflow prevention valve seat
12 ... Filling path
13 Check valve
14… Overflow prevention member
15 ... Valve opening spring
16 ... Communication passage
16a… Upstream side opening
16b ... downstream opening
18 ... Gas outlet
19 ... Minimum opening circulation section
20 ... Closed sliding part
23 ... Check valve chamber
24 ... Check member X ... Valve closing posture Y ... Valve opening posture

Claims (5)

In the housing (4), a gas take-out passage (18) comprising an inlet passage (5), an overflow prevention valve chamber (6) and an outlet passage (7) in this order is formed, and the above-described overflow prevention valve chamber (6) is formed. An overflow prevention valve seat (8) is formed in the
An overflow prevention member (14) is inserted into the overflow prevention valve chamber (6) so as to be able to contact with and separate from the overflow prevention valve seat (8).
The valve opening posture (Y) in which the overflow prevention member (14) is elastically pressed by the valve opening spring (15) and separated from the overflow prevention valve seat (8), and the inlet passage (5) Due to the differential pressure between the internal pressure and the internal pressure of the outlet passage (7), which is reduced to a predetermined pressure or more, the abutment against the overflow prevention valve seat (8) against the elastic force of the valve opening spring (15). An overflow prevention valve configured to be switchable to a closed valve position (X),
A communication passage (16) for communicating the overflow prevention valve chamber (6) with the inlet passage (5) or the outlet passage (7) is formed in the overflow prevention member (14).
Between the upstream opening (16a) and the downstream opening (16b) of the communication passage (16), the outer surface of the overflow prevention member (14) is connected to the overflow prevention valve chamber (6) and the inlet. Forming a coherent sliding portion (20) that performs coherent sliding on the inner surface of either the channel (5) or the outlet channel (7);
In the gas extraction passage (18) from the inlet passage (5) to the outlet passage (7) in the valve opening posture (Y), the smallest opening flow portion (19) having the smallest opening area is connected to the above-mentioned communication passage. An overflow prevention valve characterized by being provided in the passage (16).   A filling path (12) is formed in the housing (4) to connect the overflow prevention valve chamber (6) and the gas storage container (2), and the filling path (12) has an overflow prevention. A check valve (13) that allows gas flow from the valve chamber (6) to the gas storage container (2) but prevents gas flow from the gas storage container (2) to the overflow prevention valve chamber (6). The overflow prevention valve according to claim 1, further comprising: A check valve chamber (23) is formed between the inlet passage (5) and the downstream portion (7b) of the outlet passage (7),
A check member (24) is inserted into the check valve chamber (23), and the flow of gas from the downstream portion (7b) to the check valve chamber (23) is reduced by the check member (24). Allow, but prevent the flow of gas from the check valve chamber (23) to the downstream part of the outlet path (7b),
The overflow prevention valve chamber (6) and the outlet channel upstream portion (7a) are formed in the check member (24), and the outlet channel upstream portion (7a) is connected to the outlet channel downstream portion ( 7b)
The coherent sliding portion (20) is connected to the inner surface of any of the overflow prevention valve chamber (6), the inlet passage (5) and the outlet passage upstream portion (7a) and the overflow prevention member (14 The overflow prevention valve according to claim 1, wherein the overflow prevention valve is formed between the outer surface and the outer surface.   The overflow prevention valve according to claim 3, wherein a filling passage (12) for connecting the check valve chamber (23) and the gas storage container (2) is formed in the housing (4).   The overflow prevention valve according to claim 3, wherein a filling passage (12) communicating the check valve chamber (23) and the inlet passage (5) is formed in the check valve chamber (23). .

Images