JPH047417Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a liquid take-out valve for an LPG container in which an overflow prevention valve is provided on the inlet side of the manual on-off valve.

Conventional technology The conventional liquid take-off valve for LPG containers is an overflow prevention valve with a structure specified in "LP Gas Vehicle Structure Handling Standards" published by Japan LP Gas Vehicle Research Association, pages 75 to 76, along with "Figure 3-8". The attached liquid take-out valve was hot.

Problems that the invention aims to solve Conventional liquid extraction valves are opened and closed manually, and there is an overflow prevention valve (hereinafter referred to as EFV) on the inlet side of the liquid extraction valve, inside the attachment part to the LPG container.
is installed, and if the outlet side of the liquid take-out valve or piping is damaged and LPG suddenly flows out, the check plate will be activated due to the pressure difference applied across the check plate of the overflow prevention valve. The structure is such that the opening closes and automatically blocks the outflow of LPG.

In this type of EFV, in order to return the check plate to its pre-operation position after repairing the damage, it is necessary to equalize the pressure before and after the check plate.
Pores such as pressure equalization noise are always open, so even if the EFV operates to block the outflow of LPG in the event of damage, LPG will continue to flow out from the pores, and the outflow of LPG will not be completely prevented. It was not possible to close it.

Furthermore, the operating principle of the EFV is that as LPG flows, a pressure difference is created before and after the check plate.
It operates when the pressure difference exceeds the spring force. If the piping on the LPG container side of the car is crushed due to a collision, etc., and there is not enough LPG supplied, and the flow rate of LPG is low, the EFV will not operate, and the prevention of accidents and other dangers will not be complete.

This invention also applies to the above-mentioned EFV leakage or non-operation.
A shutoff valve is built into the liquid take-off valve body, which is useful when it is necessary to completely shut off LPG and shut off the flow of LPG, such as when the engine stops rotating.
The purpose is to provide a liquid extraction valve that can completely cut off the flow of LPG and prevent the occurrence of disasters such as fire, and is compact and does not require a separate emergency shutoff device.

Means for Solving the Problems The present invention is a liquid extraction valve for an LPG container in which an overflow prevention valve is provided on the inlet side of a manual on-off valve.
An automatic shutoff device is incorporated in the valve body outside the manual on-off valve, the automatic shutoff device includes a diaphragm valve portion and a sub-flow path valve portion, and the diaphragm valve portion has a diaphragm chamber communicating with the main flow path; The diaphragm chamber includes a diaphragm attached to the main flow channel so as to be openable and closable, and the diaphragm chamber includes a main flow channel communicating with the main flow channel, and a sub flow channel chamber separated from the main flow channel by the diaphragm. Accordingly, the sub-channel chamber is in open communication with the downstream of the main channel at the outlet of the sub-channel via a narrow sub-channel, and the main channel chamber and the sub-channel chamber are bored in the diaphragm. The outlet of the sub-channel is provided with a cut-off valve that can open and close the outlet of the sub-channel, and the cut-off valve is normally open and closed in an emergency; The above-mentioned problem can be solved by having a configuration in which the main channel can be blocked by a diaphragm by blocking the outlet of the sub-channel in an emergency.

Function: The liquid take-out valve for LPG containers of the present invention can be used by EFV in case of sudden leakage of LPG such as in the event of an accident.
The outflow of LPG is prevented, and the above-mentioned leakage of LPG is further prevented by the operation of an automatic shut-off device.

While the manual on-off valve is closed and the engine is otherwise stopped, the shutoff valve is not driven and closes the outlet of the sub-flow path. Under this condition, the pressure of the main channel chamber of the diaphragm chamber is made equal to that of the sub-channel chamber through the pores of the diaphragm, and the restoring force of the diaphragm causes the diaphragm to be in a position where it closes the main channel. Even if the manual on-off valve is opened, if the pressures in the main channel chamber and the sub-channel chamber are equal through the pores, the main channel remains closed due to the restoring force of the diaphragm. When the shutoff valve driving device is started in this state, the shutoff valve is operated in the direction of opening the sub-flow passage outlet. Then, the pressure in the sub-channel becomes equal to the pressure in the downstream main channel, and the pressure in the sub-channel chamber also decreases to the pressure in the downstream main channel. Since the pressure within the main flow passage chamber remains unchanged without decreasing, the diaphragm is moved by the difference in pressure applied to both sides of the diaphragm, opening the main flow passage. That is, the main flow path is opened and closed based on the opening and closing of the sub flow path outlet by the shutoff valve.

Since the shutoff valve opens and closes the outlet of the narrow sub-flow path, the power required for the shutoff valve drive device is small, and therefore a small drive device is sufficient, and it is much easier to use than the drive device of a valve that opens and closes a general LPG pipeline. can be made much smaller. Therefore, the automatic shut-off device incorporated into the liquid take-off valve body is small, and the liquid take-off valve of the present invention incorporating the shut-off device does not become large as a whole.

The excessive flow of LPG immediately after an accident occurs is handled by the overflow prevention valve, but the
Any leakage of LPG is completely prevented by the activation of an automatic shut-off device based on engine stoppage, and secondary disasters due to LPG leakage are also prevented.

Embodiments The structure of the present invention will be described below with reference to embodiments shown in the drawings.

Excess flow prevention valve (EFV) on the inlet 2 side of manual on-off valve 1
3 is provided, and an automatic shutoff device 5 is incorporated on the outlet side of the manual on-off valve 1 in the valve body 4,
The automatic shutoff device 5 includes a diaphragm part 6 and a sub-flow passage valve part 7, the diaphragm part 6 having a diaphragm chamber 9 communicating with the outlet opening 8 of the manual on-off valve 1, and the manual on-off valve inside the diaphragm chamber 9. 1
It consists of a diaphragm 10 attached to be able to open and close the outlet opening 8 of the diaphragm 10. The illustrated diaphragm 10 shows an open position 10a in the upper half of the center line and a closed position 10b in the lower half.

The diaphragm 10 is urged in the closing direction by a spring 11 as necessary.

The diaphragm chamber 9 is the outlet 1 of the liquid take-off valve.
Main channel chamber 14 communicating with main channel 13 opening to 2
and the main flow chamber 1 by the diaphragm 10.
4 and a sub-channel chamber 15 separated from each other. The sub-channel chamber 15 is connected to the sub-channel outlet 1 via a narrow sub-channel 16.
7 is in open communication with the main flow path 13. Moreover, the main flow path chamber 14 and the sub flow path chamber 15 are
The diaphragm 10 is communicated with through a pore 18 formed approximately at the center thereof.

The auxiliary flow path valve portion 7 is provided at the auxiliary flow path outlet 17 . In the illustrated example, the auxiliary flow path valve section 7 includes a solenoid valve 19 and a cutoff valve 21 that is connected to a plunger 20 of the solenoid valve 19 and can open and close the auxiliary flow path outlet 17 by advancing and retracting the plunger 20. The cutoff valve 21 is configured to be open when the solenoid valve 19 is energized (on) and closed when the solenoid valve 19 is not energized (off).

The solenoid valve 19, which is the driving source for the cutoff valve 21, can be turned on and off in conjunction with, for example, an engine switch;
The first drive source is not limited to the one mentioned above, but may include a pressure drive source that is turned on by the negative pressure in the manifold when the engine is rotating, and is turned off when the negative pressure disappears, such as when the engine is stopped or an accident occurs. Alternatively, it may be turned on and off by sensing the voltage from a generator (alternator).

In the figure, arrow A indicates the inflow direction of LPG to the liquid take-out valve, arrow B indicates the outflow direction, and double arrow C indicates the direction between the spindle 22 and valve stem 23 of the manual on-off valve 1.
Indicates the direction of advance and retreat.

In the above-described embodiment, the automatic shut-off device 5 is shown as being provided downstream of the manual on-off valve 1, but the automatic shut-off device 5 may be provided upstream of the manual on-off valve 1.

Effects of the invention The present invention prevents sudden outflow of LPG by using EFV by having a structure specified in the scope of the utility model registration claim, and also prevents the sudden outflow of LPG by not operating the manual on-off valve in case of a more gradual outflow. In addition, the automatic shut-off device of this invention can prevent the leakage of LPG into LPG by operating the automatic shut-off device.Moreover, since the automatic shut-off device of the liquid take-off valve for LPG containers of this invention is small, it does not require any particular space as a liquid take-out valve, which can prevent vehicle accidents. Even when the engine is stopped, the outflow of LPG is automatically prevented without any operation by the driver, which has the effect of preventing the occurrence of secondary disasters such as fire.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of the embodiment. 1... Manual on-off valve, 2... Inlet, 3... Excess flow prevention valve, 4... Valve body, 5... Automatic shutoff device,
6...Diaphragm valve part, 7...Sub-flow path valve part, 9
...Diaphragm chamber, 10...Diaphragm, 1
3... Main channel, 14... Main channel chamber, 15... Sub-channel chamber, 16... Sub-channel, 17... Sub-channel outlet, 1
8... Pore, 21... Shutoff valve.

Claims (1)

[Scope of utility model registration request] In a liquid extraction valve for an LPG container in which an overflow prevention valve is provided on the inlet side of the manual on-off valve, an automatic shut-off device is built into the valve body outside the manual on-off valve, and the automatic shut-off device is connected to the diaphragm valve part. The diaphragm valve part includes a diaphragm chamber communicating with the main flow path, and a diaphragm attached to the diaphragm chamber so as to be able to open and close the main flow path, and the diaphragm chamber communicates with the main flow path. It consists of a main channel chamber communicating with the main channel, and a sub-channel chamber separated from the main channel chamber by the diaphragm. The main channel chamber and the sub-channel chamber are communicated through a pore formed in the diaphragm, and the sub-channel outlet has an opening for opening and closing the sub-channel outlet. The present invention is characterized in that a shutoff valve is provided, and the shutoff valve is configured to be open at normal times and closed in an emergency.
Liquid extraction valve for LPG containers.