JP3090448U - Valve device with overflow prevention valve - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a gas container to be quickly filled with a large amount of filling gas, and to reliably detect an overflow to shut off a gas extraction path. A housing attached to a gas container (3).
In (2), a gas inlet (5), an inlet passage (8), an overflow prevention valve (9), an outlet passage (10), and a gas outlet (7) are formed in this order. A filling port (15) is provided in the housing (2). A filling path (17) communicating the filling port (15) with the internal space (4) of the gas container (3) is provided in parallel with the overflow prevention valve (9). The filling path (17) is provided with a check valve (18) for preventing gas from flowing from the internal space (4) to the filling port (15).

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a valve device equipped with an overflow prevention valve that shuts off a gas extraction path from a gas container when a large amount of gas flows out of a gas pipe or the like. The present invention relates to a valve device provided with an overflow prevention valve, which can reliably detect excessive outflow and shut off a gas extraction path.

[0002]

[Background of the invention]

 Natural gas used as automobile fuel is stored in a gas container mounted on the vehicle, guided from the gas container to the engine via an extraction path, and consumed. The amount of gas extracted from the above gas container may flow out of a predetermined amount or more due to, for example, a broken pipe accident. Therefore, an overflow prevention valve is usually provided in a valve device attached to the gas container in the above-mentioned takeout path, and when the amount of gas taken out increases abnormally, the overflow prevention valve is closed and the above takeout path is shut off. It is configured to be.

[0003]

[Prior art]

 Conventionally, in the above valve device with an overflow prevention valve, as shown in FIG. 8, a gas inlet (62) and a gas outlet (63) are provided in a housing (61) attached to a gas container (60). In some cases, an inlet path (64), an overflow prevention valve (65), and an outlet path (66) are formed between the gas inlet (62) and the gas outlet (63). The above-mentioned overflow prevention valve (65) has a valve seat (68) formed on the outlet path (66) side of the valve chamber (67), and the overflow prevention member (69) inserted into the valve chamber (67). ) Is pressed by a valve-opening spring (70) in a valve-opening direction separated from the valve seat (68).

[0004] When the stored gas is taken out from the gas container (60) through the inlet path (64), the valve chamber (67), and the outlet path (66) in this order, excessive outflow occurs and the outlet path When the internal pressure of the valve (66) decreases and the pressure difference between the valve chamber (67) and the valve chamber (67) exceeds a predetermined value, the overpressure preventing member (69) resists the elastic pressure of the valve-opening spring (70) due to the pressure difference. The valve is moved to the valve seat (68) side to close the valve. In the valve open state, the overflow prevention member (69) is received at a position separated from the valve seat (68) by a predetermined distance by a receiving portion (71) formed in the housing (61). I have. Therefore, when a predetermined pressure difference is generated between the outlet path (66) and the valve chamber (67), the overflow prevention member (69) reliably performs the valve closing operation.

[0005]

[Problems to be solved by the invention]

 The above-mentioned vehicles using natural gas as fuel are also becoming widespread in large and long-distance vehicles such as buses and trucks, and the storage capacity of gas containers mounted on these vehicles is expected to increase. On the other hand, when the gas is filled in the gas container, the gas is usually filled from the above-mentioned outlet path, so that the filled gas passes through the overflow prevention valve. Therefore, in order to quickly fill a large amount of gas into the gas container described above, the diameter of the outlet path should be increased, the diameter of the outlet path of the overflow prevention valve should be increased, and It is conceivable that the distance between the overflow prevention member and the valve seat is increased by retracting the valve.

However, in the conventional valve device with an overflow prevention valve, if the diameter of the outlet path is increased or the distance between the overflow prevention member and the valve seat is increased, the outlet path generated when an overflow occurs is reduced. The valve closing operability of the overflow prevention valve becomes insensitive to the differential pressure with the valve chamber. For this reason, the detection of excessive outflow was uncertain, and there was a risk that the gas extraction path could not be reliably shut off when an overcurrent occurred.

The present invention solves the above-mentioned problems, and enables a gas container to be quickly filled with a large amount of filling gas, and furthermore, a valve device with an overflow prevention valve capable of reliably detecting an excessive outflow and shutting off a gas extraction path. To provide a technical issue.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention will be described with reference to FIGS. 1 to 7 showing an embodiment of the present invention, in which a valve device with an overflow prevention valve is configured as follows. That is, a gas inlet (5) and a gas outlet (7) are provided in a housing (2) attached to a gas container (3), and an inlet is provided between the gas inlet (5) and the gas outlet (7). A valve device with an overflow prevention valve, in which a passage (8), an overflow prevention valve (9) and an outlet passage (10) are formed in this order, wherein a filling port (15) is provided in the housing (2). A filling path (17) communicating the filling port (15) with the internal space (4) of the gas container (3) is provided in parallel with the overflow prevention valve (9). 17) is characterized in that a check valve (18) for preventing gas from flowing from the internal space (4) to the filling port (15) is provided.

[0009]

[Action]

 When extracting gas from the gas container, for example, by opening an on-off valve provided at the outlet path, the gas is extracted from the gas inlet through the inlet path, the overflow prevention valve, the outlet path, and the gas outlet in order. During this gas extraction, an excessive outflow occurs, and when the internal pressure of the above-mentioned outlet passage decreases and the differential pressure with the overflow prevention valve chamber becomes a predetermined value or more, the overpressure occurs due to the differential pressure as in the above-described conventional technology. The check valve closes.

When filling the gas container with a gas, a gas filling device is connected to the filling port, and the filling gas passes through the filling path from the filling port without passing through the overflow prevention valve. Is filled in a gas container.

The above-mentioned filling port may be formed separately from the above-mentioned gas outlet, or both may be used. That is, when both are formed at different positions, both ends of the filling path are connected to the filling port and the intermediate portion of the entrance path, respectively.

[0012] When the gas outlet and the filling port are also used, both ends of the filling path are connected to an intermediate part of the outlet path and an intermediate part of the inlet path, respectively. In this case, it is preferable to form a large diameter between the gas outlet, which is a filling port, and the intermediate portion in the outlet path so that the filling gas is quickly filled.

In the case where the gas outlet and the filling port are also used, a first communication port and a second communication port are formed on an outer surface of the housing, and an intermediate portion of the inlet path is connected to the first communication port. The opening communicates with the mouth via the first communication passage, and the intermediate portion of the outlet passage communicates with the second communication opening via the second communication passage. Then, the first communication port and the second communication port communicate with each other via a third communication path, and the filling path is formed by the third communication path, the first communication path, and the second communication path. Can be configured.

[0014]

[Embodiment of the invention]

 1 to 3 show a first embodiment of the present invention, FIG. 1 is a system diagram of a valve device with an overflow prevention valve, FIG. 2 is a partially cutaway view of the valve device, and FIG. FIG. 3 is a sectional view taken along the line III.

First, a schematic configuration of a valve device with an overflow prevention valve will be described with reference to FIG. As shown in FIG. 1, the valve device (1) communicates with a housing (2), a gas inlet (5) communicating with an internal space (4) of a gas container (3), and a discharge pipe (6). A gas outlet (7) is provided between the gas inlet (5) and the gas outlet (7). An inlet passage (8), an overflow prevention valve (9) and an outlet passage (10) are provided between the gas inlet (5) and the gas outlet (7). They are formed in order. A gas relief path (12) branches off at an intermediate portion (11) of the inlet path (8), and a safety valve (13) is attached to the gas relief path (12). A shut-off valve (14) is provided at an intermediate portion of the outlet path (10).

The housing (2) has a filling port (15) formed at a position different from the gas outlet (7), and a filling pipe (16) is connected to the filling port (15). Is done. In the housing (2), a charging path (17) is provided between the charging port (15) and an intermediate portion (11) of the inlet path (8). It is provided in parallel with (9). Therefore, the filling port (15) communicates with the internal space (4) of the gas container (3) via the filling path (17) and the upstream portion of the inlet path (8). In this filling path (17), the gas flow from the filling port (15) to the internal space (4) is allowed, but the gas flow from the internal space (4) to the filling port (15) is allowed. A check valve (18) is provided to block the flow of gas. In the present invention, the filling path (17) may be provided between the filling port (15) and the internal space (4), as shown by a virtual line in FIG.

The above-mentioned valve device (1) is used as follows. By opening the shut-off valve (14) at the time of gas removal, the stored gas in the gas container (3) passes through the gas inlet (5), the inlet passage (8), the overflow prevention valve (9) and the outlet passage (10). The gas is taken out from the gas outlet (7) in order, and supplied to equipment (19) such as an engine via a take-out pipe (6). At this time, since the check path (18) is provided in the filling path (17), the stored gas does not flow out of the filling port (15).

If an excessive outflow occurs for some reason during the above-mentioned gas removal, the overflow prevention valve (9) detects this and closes, and the removal of the gas from the gas outlet (7) stops. After the cause of the above-mentioned excessive outflow is eliminated, the closed valve (9) is returned to the open state by, for example, closing the closing valve (14).

When filling the empty gas container (3) with a new high-pressure gas, a gas filling device (not shown) is connected to the filling port (15) via a filling pipe (16). Then, a high-pressure filling gas is supplied to the filling port (15). The filling gas passes from the filling port (15) through the filling passage (17), the check valve (18) and the upstream portion of the inlet passage (8) without passing through the above-mentioned overflow prevention valve (9). The gas is charged from the gas inlet (5) into the internal space (4) of the gas container (3).

Next, a specific structure of the valve device (1) will be described with reference to FIGS. 2 and 3 while referring to FIG. A leg screw (20) is formed at the lower part of the housing (2) of the valve device (1), and the leg screw (20) is screwed and fixed to the neck of the gas container (3). Is done. The gas inlet (5) is opened at the lower surface of the leg screw (20). As shown in FIG. 3, an outlet nozzle (21) is provided at the upper part of the housing (2), and the gas outlet (7) is opened to the outlet nozzle (21).

In the housing (2), the gas inlet (5) is connected to the inlet passage (8), the valve chamber (22) of the overflow prevention valve (9), and the outlet passage (10). The gas is connected to the gas outlet (7) in order. A closing valve chamber (23) of the closing valve (14) is provided in an intermediate portion of the outlet path (10), and a closing member (24) is inserted into the closing valve chamber (23). The closing member (24) is interlocked with the operating handle (25) .By operating the operating handle (25), the closing member (24) is moved to the inlet of the closing valve chamber (23). It moves forward and backward with respect to the provided closing valve seat (26) to open and close.

As shown in FIG. 3, a communication passage (27) is formed from the above-mentioned closing valve chamber (23) in a direction opposite to the downstream outlet passage (10), and the communication passage (27) is formed. A communication port (28) is opened at the outer end of the. The communication port (28) is connected to an outlet path from another gas container (not shown), whereby a plurality of gas containers are connected to each other.

As shown in FIG. 2, the overflow prevention valve chamber (22) is provided with an overflow prevention valve seat (29) at the periphery of the opening of the outlet passage (10). The overflow prevention member (30) inserted into the prevention valve chamber (22) moves forward and backward with respect to the overflow prevention valve seat (29). A return projection (31) is provided at the tip of the overflow prevention member (30), and when the overflow prevention member (30) is in contact with the overflow prevention valve seat (29), the valve is closed. The projection (31) is configured so that the tip thereof projects into the closing valve chamber (23).

A valve opening spring (32) is arranged between the overflow prevention member (30) and the inner surface of the overflow prevention valve chamber (22). The overflow prevention member (30) is resiliently pressed in a valve opening direction away from the overflow prevention valve seat (29). The above-mentioned overflow prevention valve chamber (22) is sealed with a lid member (33), and the inner end of the lid member (33) is resiliently pressed by the valve-opening spring (32) to open in the valve opening direction. It is configured to receive the moved overflow prevention member (30).

As shown in FIG. 3, a cylinder (34) having a check valve (18) is screwed and fixed to a halfway height of the housing (2). The above-mentioned filling port (15) is opened at the outer end face of 34). A filling path (17) is formed between the filling port (15) and the intermediate portion (11) of the inlet path (8), and the check path (18) is formed in the filling path (17). ) Is arranged, and the flow of gas from the inlet channel (8) to the filling port (15) is prevented. A gas release path (12) communicating with the safety valve (13) is branched at an intermediate portion (11) of the entrance path (8).

FIGS. 4 to 7 show a second embodiment and a third embodiment of the present invention. In these embodiments, members having the same functions as those in the first embodiment will be described in principle with the same reference numerals.

4 and 5 show a second embodiment, FIG. 4 is a system diagram of a valve device with an overflow prevention valve, and FIG. 5 is a partially broken sectional view of the valve device. In the second embodiment, unlike the first embodiment, the gas outlet (7) is also used as the filling port (15). Therefore, the extraction pipe (6) and the filling pipe (16) communicating with the gas outlet (7) are shared, and the configuration of these pipes connected to the valve device (1) is simplified. .

The closing valve chamber (23) formed in the middle part (35) of the outlet passage (10) formed in the housing (2) and the middle part (11) of the inlet passage (8) are in excess. It is in communication with the flow prevention valve (9) by a filling path (17) arranged in parallel. The gas flow from the gas inlet (15), which is the gas outlet (7), to the internal space (4) of the gas container (3) is allowed in this filling path (17). A check valve (18) for preventing a gas flow from the space (4) to the filling port (15) via the filling path (17) is provided.

The specific structure of the valve device (1) will be described with reference to FIG. 5 while referring to FIG. The housing (2) of the valve device (1) is provided with a mounting hole (36) for the check valve (18) downward from the upper surface of the housing (2). The lower end communicates with the intermediate portion (11) of the above-mentioned entrance passage (8) via a first communication passage (37).

The above-mentioned mounting hole (36) covers the upper end opening with a check valve cover member (38) to form a check valve chamber (39) therein, and the check valve chamber (39) is formed in the check valve chamber (39). The check member (40) and the check spring (41) are inserted. An annular communication space (43) is formed around the lower peripheral wall (42) of the check valve lid member (38), and a through-hole (44) is formed in the peripheral wall (42) to form The check valve chamber (39) communicates with the communication space (43). The communication space (43) communicates with the closing valve chamber (23) through a second communication passage (45). The first communication path (37), the check valve chamber (39), the through hole (44), the communication space (43), and the second communication path (45) form a filling path (17). .

6 and 7 show a third embodiment, FIG. 6 is a system diagram of a valve device with an overflow prevention valve, and FIG. 7 is a partially broken sectional view of the valve device. In the third embodiment, the gas outlet (7) also serves as the filling port (15), as in the second embodiment. However, as shown in FIG. 6, unlike the second embodiment described above, a first communication port (46) and a second communication port (47) are formed on the outer surface of the housing (2), and The intermediate portion (11) of (8) communicates with the first communication port (46) via the first communication passage (37), and is an intermediate portion (35) of the outlet passage (10). The closing valve chamber (23) communicates with the second communication port (47) through a second communication path (45). The first communication port (46) and the second communication port (47) communicate with each other via a third communication path (48), and the first communication path (46) and the second communication path (47) are connected. ) And the third communication path (48) constitute the above-mentioned filling path (17). In the filling path (17), the gas flows from the internal space (4) of the gas container (3) to the filling port (15) through the filling path (17) in the first communication path (37). A check valve (18) for preventing the air flow is provided.

The specific structure of the valve device (1) will be described with reference to FIG. 6 and FIG. A cylindrical body (34) having a check valve (18) similar to that used in the first embodiment is screw-fixed to the housing (2) of the valve device (1) at an intermediate height thereof. ing. The first communication port (46) is open at the outer end surface of the cylindrical body (34), and the first communication port (46) is located between the first communication port (46) and the intermediate portion (11) of the inlet passage (8). A first communication passage (37) is formed in the first communication passage.

Further, a second communication port (47) is opened at a position different from the gas outlet (7) at an upper portion of the housing (2), and the second communication port (47) is connected to the outlet path (10). A second communication passage (45) is formed between the valve and the closing valve chamber (23) in the intermediate portion (35) of the first embodiment.

The first communication port (46) and the second communication port (47) are connected by a U-shaped communication pipe (50) via joints (49, 49), respectively. A third communication path (48) is formed in (50). Therefore, the closing valve chamber (23), which is an intermediate portion (11) of the inlet passage (8) and an intermediate portion (35) of the outlet passage (10), is connected to the first communication passage (37) and the third communication passage. (48) and the second communication passage (45).

[0035]

[Effect of the invention]

 Since the present invention is configured and operates as described above, it has the following effects.

(1) At the time of gas filling, since the filling gas is filled into the gas container without passing through the overflow prevention valve, a large amount of gas can be obtained by enlarging the diameter of a filling path provided in parallel with the overflow prevention valve. Can be quickly filled into the gas container or the like from the filling path. In addition, since the filling gas does not pass through the overflow prevention valve, there is no need to increase the diameter of the outlet passage near the overflow prevention valve chamber or to increase the distance between the overflow prevention member and the valve seat. It is possible to maintain the operation accuracy of the fuel cell at a high level. Therefore, when an excessive outflow occurs, it is possible to reliably detect the outflow and shut off the gas extraction path.

(2) When the filling port is formed at a position different from the gas outlet, and both ends of the filling path are connected to the filling port and the intermediate portion of the inlet path, respectively. In addition, the filling passage can be easily formed in the housing, and since the filling gas does not pass through the outlet passage, it is not necessary to increase the diameter of the outlet passage, so that the operation accuracy of the overflow prevention valve can be maintained at a high level.

(3) In the case where the above-mentioned gas outlet is also used as the above-mentioned filling port, and both ends of the above-mentioned filling path are connected to the middle part of the above-mentioned outlet path and the middle part of the above-mentioned inlet path, respectively. In addition, an extraction pipe for extracting and consuming the stored gas and a filling pipe for supplying the filling gas can be used also, and these pipes can be simplified.

(4) When the gas outlet also serves as a filling port, a first communication port and a second communication port are formed on the outer surface of the housing, and an intermediate portion of the inlet path is connected to the first communication port. The first communication path communicates with the mouth via the first communication path, and the intermediate portion of the exit path communicates with the second communication port via the second communication path. When the filling path is constituted by the third communication path, the first communication path, and the second communication path, a part of the filling path is formed by the housing. Since it is formed outside, the housing itself can be miniaturized, and the flow path in the housing can be simplified, so that it can be implemented at low cost.

[Brief description of the drawings]

FIG. 1 is a system diagram of a valve device with an overflow prevention valve, showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the valve device showing the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a system diagram of a valve device with an overflow prevention valve according to a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 3, showing a second embodiment of the present invention.

FIG. 6 is a system diagram of a valve device with an overflow prevention valve, showing a third embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 3, showing a third embodiment of the present invention.

FIG. 8 is a partially cutaway elevational view of a valve device showing the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve apparatus, 2 ... Housing, 3 ... Gas container, 4 ...
Internal space, 5 ... gas inlet, 7 ... gas outlet, 8 ... inlet passage,
9: Overflow prevention valve, 10: Exit path, 11: Intermediate part of entrance path (8), 15: Filling port, 17: Filling path, 18: Check valve, 35: Exit path
(10) Intermediate part, 37 ... first communication passage, 45 ... second communication passage, 46 ...
1st communication port, 47 ... 2nd communication port, 48 ... 3rd communication path, 50 ... communication pipe.

Claims (4)

[Utility model registration claims] 1. A housing attached to a gas container (3).
A gas inlet (5) and a gas outlet (7) are provided in (2), and an inlet passage (8) and an overflow prevention valve (9) are provided between the gas inlet (5) and the gas outlet (7). An outlet path (10) and a valve device with an overflow prevention valve formed in order, wherein the housing (2) is provided with a filling port (15),
A filling path (17) communicating the filling port (15) and the internal space (4) of the gas container (3) is provided in parallel with the overflow prevention valve (9). ), The filling port (1
5) A valve device with an overflow prevention valve, comprising a check valve (18) for preventing the flow of gas to 5). 2. The gas inlet (15) is connected to the gas outlet (15).
Formed at a different position from both ends of the filling path (17),
The valve device with an overflow prevention valve according to claim 1, wherein the valve device is connected to the filling port (15) and the intermediate portion (11) of the inlet channel (8), respectively. 3. The gas outlet (7) is connected to the filling port (15).
Both ends of the above-mentioned filling path (17) are also used as the above-mentioned exit path (10).
The valve device with an overflow prevention valve according to claim 1, wherein the valve device is connected to an intermediate portion (35) of the intake passage (8) and an intermediate portion (11) of the inlet passage (8), respectively. 4. A first communication port formed on an outer surface of the housing (2).
(46) and a second communication port (47), and the intermediate portion (11) of the inlet path (8) is connected to the first communication port (46) through a first communication path (37). And the middle part (3
5) communicates with the second communication port (47) via a second communication path (45), and connects the first communication port (46) and the second communication port (47) with the third communication port (47).
The filling path (17) was constituted by the third communicating path (48), the first communicating path (37), and the second communicating path (45) by communicating through the communicating path (48). The valve device with an overflow prevention valve according to claim 3.