KR20070027326A - Containing valve of vehicle using compressed natural gas - Google Patents

Abstract

A gas valve of a vehicle using compressed natural gas is provided to prevent leakage of gas when an excessive current preventing valve is interrupted by deleting a pin hole from a piston. In a gas valve of a vehicle using compressed natural gas, a gas passage(103) which is a main discharge passage is formed in a housing and is installed at an outlet of a high pressure container(1). The gas valve includes an excessive current preventing valve selectively opening and closing the gas passage according to the difference between the pressures between the gas passage and the high pressure container. A separate bypass valve communicating the gas passage with the high pressure container is formed in the interior of the housing. A valve unit for opening and closing the bypass passage is installed in the bypass passage.

Description

Container valve for vehicle using compressed natural gas

1 is a perspective view showing a connection state of a high-pressure container and a container valve, a connection pipe in which fuel is stored in a large bus using CNG gas as fuel;

Figure 2a and 2b is a cross-sectional view showing a conventional container valve applied to the compressed natural gas vehicle,

Figure 3 is a perspective view showing a piston of the overflow valve installed in the conventional vessel valve,

4A and 4B are cross-sectional views showing a gas container valve of a compressed natural gas vehicle according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: high pressure container 2: fuel piping

100: container valve 101: container valve housing

102: discharge hole 103: gas passage

104: spare passage 105: bypass passage

106: passage 107: mounting hole

108: valve means (bypass adjusting bolt) 109: O-ring

110: main valve 120: safety valve

130: overflow valve

The present invention relates to a gas container valve of a compressed natural gas vehicle, and more particularly, to remove the pinhole formed in the piston of the overflow valve, and to separate the bypass passage and the bypass passage by manual operation inside the container valve housing. It is provided with a valve means for opening and closing, when opening the valve means relates to a gas container valve of a compressed natural gas vehicle configured to discharge the gas in the high pressure vessel through the bypass passage instead of the conventional pinhole.

Recently, efforts to develop alternative energy for petroleum energy have been actively made in various fields.

This is recognized not only in preparation for exhaustion of petroleum resources, but also as part of efforts to deal with the more serious problem of environmental pollution. It is emerging as a challenge.

Accordingly, automakers around the world are making great efforts to develop automobiles using alternative energy that can significantly reduce harmful emissions compared to gasoline or diesel, which is a conventional automobile fuel.

As part of this, research on CNG vehicles that use CNG gas (Compressed Natural Gas) as fuel is being actively conducted. In Korea, CNG buses that use CNG gas as fuel are in mass production.

On the other hand, in the case of a large bus using CNG gas as fuel, as shown in FIG. 1, usually 6 to 8 high pressure vessels (fuel tanks) 1 storing CNG gas under the vehicle floor are located in the front and rear direction of the vehicle body. It is attached long horizontally.

And, each of the outlet portion of these high-pressure vessels (1) is equipped with a vessel valve 100, the vessel valve 100 is connected to the fuel pipe (2), wherein the high-pressure vessels (1) are fuel pipe (2) Bars connected in parallel by the CNG gas discharged from the high-pressure vessels (1) through the vessel valve 100 is supplied to the engine along the fuel pipe (2).

On the other hand, when a certain portion of the fuel pipe 2 is damaged due to a vehicle collision or the like while the high-pressure-filled CNG gas is discharged from each container 1, a large amount of gas leaks through this damaged portion to cause a fire. And may cause secondary accidents such as explosions.

Therefore, when abnormal gas leakage of the fuel pipe (2) occurs, a device that automatically shuts off the gas discharge of each container (1) is required, and this role is the overflow prevention valve installed in the container valve (100) (Excess Flow Valve) 130.

2A and 2B are cross-sectional views illustrating a conventional container valve applied to a compressed natural gas vehicle, and show an operating state of the overflow valve 130 installed in the container valve 100.

2A illustrates a state in which the overflow preventing valve 130 is not operated (open state), and FIG. 2B illustrates a state in which the overflow preventing valve 130 is operated (closed state), and the overflow preventing valve 130 collides with each other. When abnormal gas leakage occurs in the fuel pipe 2 such as when the fuel pipe is damaged due to an accident, the gas inside the high-pressure container 1 is temporarily discharged by temporarily blocking the passage inside the container valve 100 (overflow). To prevent the valve.

The container valve and the overflow prevention valve therein will be described in detail with reference to FIGS. 2A and 2B.

In FIG. 2A and FIG. 2B, reference numeral 110 denotes a main valve mounted on an upper portion of the container valve housing 101, and reference numeral 102 denotes a discharge hole formed to discharge gas from the container valve 100 to the outside.

The main valve 110 is to open and close the gas passage 103 leading to the discharge hole 102 while the valve member 112 at the bottom moves up and down when rotating the rotary knob 111 of the upper end.

In addition, since the discharge hole 102 is in communication with the fuel pipe (reference numeral 2 of FIG. 1) while the fuel pipe is connected to the container valve 100, the main valve 110 is opened as shown in FIG. 2A. Gas passing through the overflow valve (open state) 130 is discharged to the fuel pipe through the discharge hole (102).

In addition, when the temperature rises due to a fire or the like, in order to prevent explosion of the container filled with the high-pressure CNG gas, a safety valve 120 which automatically discharges the gas inside the container 1 through the separate pipe 3 of FIG. 1. ) Is installed, the safety valve 120 is mounted to the lower end of the container valve housing 101 to discharge the gas inside the container (1) through the preliminary passage (104).

The preliminary passage 104 is a passage formed separately from the gas passage 103 in the lower side of the vessel valve housing 101, and is in complete communication with the inside of the vessel 1 without an intermediate obstacle until the safety valve 120 is installed. It is.

On the other hand, the overflow prevention valve 130 is installed at the inlet of the gas passage 103, the gas passage 103 and discharge by passing the gas inside the container 1 in the non-operation state, that is, the valve open state of Figure 2a The gas can be supplied to the fuel pipe 2 through the hole 102.

The overflow prevention valve 130 has a housing 131 having a gas passage therein, a piston 132 for opening and closing the gas passage by moving back and forth in the housing 131, and elastically supporting the piston 132. And a return spring 136 that provides an elastic restoring force for maintaining the piston 132 in the open position (reverse position, non-operation position).

Here, the piston 132 has a gas passage hole 133 through which gas can pass through four sides of the rear portion as shown in FIG. 3, and a pin hole 135 penetrating back and forth in the center thereof. This structure is formed.

Referring to the drawings to explain the operating state of the overflow prevention valve, the overflow prevention valve 130 is a gas pressure in the gas passage 103 in the high pressure vessel 1 and the gas passage 103 in the container valve 100 is approximately balanced Figure 2a As described above, the piston 132 is retracted by the spring force of the return spring 136 to open the gas passage 103.

That is, as the valve surface 132a of the piston 132 is spaced apart from the seat surface 131a of the inner passage of the housing 131, the overflow preventing valve 130 is opened, thereby passing through the gas passage hole 133. Gas passes through the space between the valve surface 132a and the seat surface 131a, passes through the gas passage 103 and the discharge hole 102 of the container valve 100, and is then supplied to the fuel pipe 2.

On the other hand, when the gas pressure in the gas passage 103 of the container valve 100 in communication with the fuel pipe is greatly reduced due to breakage of the fuel pipe, the gas pressure in the container 1 strongly acts on the piston 132 to push the piston 132. At this time, the piston 132 moves forward while compressing the return spring 136, and the valve surface 132a and the seat surface 131a are compressed as shown in FIG. 2B, that is, the valve closed state.

As described above, the overflow prevention valve 130 blocks the inlet of the gas passage 103 while the piston 132 overcomes the spring force and moves forward by the pressure difference between the gas passage 103 and the vessel 1 in an emergency. The internal gas can be prevented from escaping at once.

Meanwhile, in order to reconnect the fuel pipe 2 to the container valve 100 after repairing the damage, the main valve 110, which was closed after the pipe connection, must be opened again, and then the overflow valve 130 must be opened again. Bar, at this time, the overflow prevention valve 130 can not be opened by the manual operation, after completing all the connection should be open to the overflow prevention valve 130 automatically.

To this end, the pinhole 135 is formed in the piston 132 of the overflow prevention valve 130, and the pinhole 135 is provided for the automatic return function of the piston 132.

That is, when the overflow prevention valve 130 is operated and closed, after the pipe connection is completed, the piston 132 should be returned to the open position (reverse) again so that gas can be discharged from the container 1, At this time, the gas of the high-pressure container 1 flows in part toward the gas passage 103 of the container valve 100 through the pin hole 135, so that the fuel pipe 2, the gas passage 103, and the high pressure vessel 1 When the pressure is approximately equal, the piston 132 can be automatically returned to its initial state by the elastic restoring force of the return spring 136.

As described above, the pinhole 135 induces an initial state (open state) of the overflow preventing valve 130 while achieving a pressure balance by allowing the gas of the high pressure container 1 to flow into the gas passage 103 of the container valve 100. It plays a role.

However, the overflow valve 130 is a state in which the pinhole 135 is always open, so even when the pipe breakage is broken, the small amount of gas continues to pass through the pinhole 135.

Therefore, in the related art, a small amount of the pipe is damaged after the operation of the overflow prevention valve 130, but there is a risk of fire, such as a continuous flow of gas. Until now, the pinhole 135 is necessary for the automatic return of the piston 132. As it is a state, the countermeasures are urgently needed.

Therefore, the present invention has been invented to solve the above problems, to delete the pinhole formed in the piston of the overflow valve, and to manually open and close the bypass passage and the bypass passage in the container valve housing. It is provided with a valve means for opening the valve means, it is configured to discharge the gas in the high-pressure container through the bypass passage in place of the conventional pinhole, compression to prevent the occurrence of accidents due to gas leakage The purpose is to provide a gas container valve of a natural gas vehicle.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a gas passage, which is a main discharge passage, is formed inside the housing and installed at an outlet portion of the gas-stored high pressure container, and has an overflow prevention valve for selectively opening and closing the gas passage according to the pressure difference between the gas passage and the high pressure period. In the gas container valve of a compressed natural gas vehicle,

A separate bypass passage for communicating the gas passage and the inside of the high-pressure container is formed in the housing, and the bypass passage is provided with valve means for opening and closing by manual operation.

In particular, the bypass passage is characterized in that it is provided by forming a passage which is opened and closed by the valve means from one side of the preliminary passage for communicating the inside of the high-pressure container to the safety valve in the housing.

In addition, the valve means forms a hole from the outer side of the container valve housing to the bypass passage and then processes the thread on the inner circumferential surface of the hole to form a mounting hole of the nut structure, and by Characterized in that it is configured by inserting the bypass adjustment bolt for opening and closing the passage passage.

In addition, the bypass adjustment bolt is an O-ring for preventing gas leakage in the closed state while the valve surface is closed to the valve surface while the valve surface of the bolt end is pressed or spaced in the inner seat surface of the bypass passage. It is characterized in that it is installed.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to a gas container valve of a compressed natural gas vehicle that improves gas leakage of a pinhole, and in the related art, even if the overflow prevention valve is operated due to a breakdown of a fuel pipe, gas is continuously released through the pinhole, causing a fire hazard. In order to solve this problem, the pinhole is removed from the piston of the overflow valve and a separate bypass passage that can be opened and closed by manual operation is formed in the vessel valve housing, thereby bypassing the conventional pinhole. It is characterized by the fact that it was replaced.

4A and 4B are cross-sectional views showing a gas container valve of a compressed natural gas vehicle according to the present invention, with reference to this will be described a preferred embodiment of the present invention.

4A and 4B show a state in which the overflow valve 130 is operated, that is, a closed state. In the related art, even when the overflow valve is closed, the gas continues to be discharged through the pinhole installed by the need for the automatic return function. In the present invention, the pinhole of the piston 132 is deleted.

When the pinhole is deleted in this way, even if the piping is repaired and connected while the overflow prevention valve 130 is in operation, the pressure balance between the gas passage 103 of the vessel 1 of the high pressure part and the vessel valve 100 of the low pressure part is maintained. Since it is not possible to open the overflow valve 130, the gas can not be discharged from the container (1).

Therefore, in the present invention, a separate bypass passage 105 is formed inside the container valve housing 101 to communicate the gas passage 103 which is the main discharge passage and the inside of the high pressure container 1, and the bypass passage ( 105 is provided with a valve means 108 capable of opening and closing operation by manual operation.

In a preferred embodiment, the bypass passage 105 is a gas passage at one side of the preliminary passage 104 provided in the vessel valve housing 101, that is, the preliminary passage 104 connected to the safety valve 120. (103) It may be provided by forming a separate passage 106 to one side.

Since the preliminary passage 104 is always in communication with the high pressure vessel 1 without any obstacles, when the preliminary passage 104 and the gas passage 103 are connected to a separate passage 106, the preliminary passage 104 is added to the preliminary passage 104. The formed passage 106 becomes one bypass passage 105 connecting the high pressure vessel 1 and the gas passage 103.

In addition, the valve means 108 forms a hole from the outer side of the container valve housing 101 to the bypass passage 105, and then processes a screw line on the inner circumferential surface of the vessel to form a mounting hole 107 having a nut structure. The bypass adjustment bolt 108 may be inserted into and fastened to the mounting hole 107.

The bypass adjustment bolt 108 is to be moved forward or backward during the rotation operation, when the valve surface 108a of the end of the bolt is pressed on the inner seat surface 106a of the bypass passage 105 during the forward passage The valve 105 is closed, and the bypass passage 105 is opened while the valve surface 108a and the seat surface 106a are spaced apart at the time of retraction.

Here, it is preferable to install an O-ring 109 on the valve surface 108a of the bypass adjustment bolt 108 to prevent the gas from leaking through this portion.

In the container valve 100 of the present invention made as described above, the bypass passage 105 is blocked by the bypass adjusting bolt 108 at normal times.

Then, in order to open the overflow preventing valve 130 after repairing the pipe in the state where the overflow preventing valve 130 is operated due to the damage of the fuel pipe 2, the bypass passage 105 is released by releasing the bypass adjusting bolt 108. Will open.

At this time, since the bypass passage 105 and the gas passage 103 communicate with each other, the gas in the container 1 flows into the gas passage 103 through the bypass passage 105, and then into the fuel pipe through the discharge hole 102. It discharges, and eventually the pressure of the gas passage 103 and the container 1 will become substantially equal.

As a result, the piston 132 of the overflow prevention valve 130 is returned to the initial position by the elastic restoring force of the return spring 136, the overflow prevention valve 130 is opened, and then closes the bypass control bolt 108 As usual, the gas in the container 1 is discharged only through the overflow valve 130.

As described above, in the container valve 100 of the present invention, when pressure equalization is required between the vessel 1, which is a high pressure part, and the gas passage 103, which is a low pressure part, after the piping is repaired, the gas pressure of the high pressure gas path is simply released by loosening the bypass adjusting bolt 108. By filling the 103, it is possible to easily open the overflow valve 130.

In particular, the container valve 100 of the present invention is eliminated the risk of gas leakage through the pinhole while the pinhole of the overflow prevention valve 130 is removed, it is possible to prevent a fire accident due to the gas leak.

In addition, when it is necessary to discharge the gas in the container 1, such as when the container 1 and the container valve 100 is replaced, conventionally, the overflow valve 130 is operated to discharge the gas only through the pinhole. Since the discharge time was excessively required, according to the present invention, when the bypass adjusting bolt 108 is released to open the bypass passage 105, the gas in the container 1 can be discharged more quickly (priorly, 2 to 3). Reduced discharge time within 30 minutes of the time).

As described above, according to the gas container valve of the compressed natural gas vehicle according to the present invention, the pinhole formed in the piston of the overflow valve is deleted, and a separate bypass passage and this bypass passage can be provided inside the container valve housing. It is provided with a valve means for opening and closing by operation, when opening the valve means can be configured to discharge the gas in the high-pressure vessel through the bypass passage in place of the conventional pinhole, there is the following effects.

1) Since the pinhole is deleted from the piston of the overflow valve, the gas can be prevented from leaking through the pinhole during the shutoff operation of the overflow valve, and the occurrence of an accident due to the gas leak can be prevented.

2) When the valve means is opened, the gas in the container can be discharged more quickly. In particular, when the container and the container valve are replaced, the gas discharge time of the container can be significantly shortened.

Claims (4)

Compressed natural gas vehicle having a gas passage, which is a main discharge passage, is installed at the outlet of the gas-stored high-pressure vessel inside the housing, and is provided with an overflow valve to selectively open and close the gas passage according to the pressure difference between the gas passage and the high pressure period. Gas container valve of The gas container of the compressed natural gas vehicle is formed in the housing by forming a separate bypass passage for communicating the gas passage and the inside of the high-pressure container, and the bypass passage is provided with a valve means for opening and closing by manual operation. valve. The method according to claim 1, The bypass passage is formed by forming a passage which is opened and closed by the valve means from one side of the preliminary passage for communicating the inside of the high-pressure container to the safety valve in the housing by the valve means side gas container of the compressed natural gas vehicle valve. The method according to claim 1 or 2, The valve means forms a hole from the outer side of the container valve housing to the bypass passage, and then processes a screw line on the inner circumferential surface of the hole to form a mounting hole having a nut structure. Gas container valve of a compressed natural gas vehicle, characterized in that configured by inserting and tightening the bypass adjustment bolt to open and close. The method according to claim 3, The bypass adjustment bolt is configured to open and close the bypass passage while the valve face at the end of the bolt is compressed or spaced from the inner seat face of the bypass passage while an O-ring is installed on the valve face to prevent gas leakage. Gas container valve of a natural gas vehicle, characterized in that the compression.

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