JPH0540399Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a filling valve for filling a pressure-resistant gas container with liquefied gas, or a take-out valve for taking out liquefied gas from this container.

[Prior art] For example, in LP gas tanks for automobiles, fuel gas tanks for large kitchens, etc., liquefied gas is filled into the gas tank in a liquid state, taken out from the gas tank in a liquid state, and the liquefied gas in the liquid state is forcedly vaporized. It is used to vaporize it in a device and use it for a specific purpose.

The filling valve for filling this liquefied gas into the gas tank in a liquid state is designed to prevent the pressure inside the gas tank from exceeding a specified value due to overfilling of the gas. An overfill prevention valve has been proposed that shuts off the gas flow path when the tank is filled with liquefied gas. In order to prevent the risk of a large amount of liquefied gas leaking out in the event of an overflow, the overflow prevention valve is equipped with an overflow prevention valve that shuts off the gas flow path in the event that a large amount of liquefied gas leaks in excess of a preset gas flow rate. A liquefied gas take-off valve with a flow prevention valve has been proposed.

[Problems to be solved by the invention] By the way, in order to temporarily store liquefied gas in a pressure-resistant gas container and then take it out again for use,
It is natural to attach both a liquefied gas filling valve and a take-out valve to a pressure-resistant gas container, but as mentioned above, the filling valve and take-out valve of a conventional pressure-resistant gas container are each configured independently. It is necessary to separately attach these two valves to the pressure-resistant gas container by a method such as welding, and the installation work is extremely time-consuming.

In addition, in such a pressure-resistant gas container, if it is an LPG tank for an automobile, even if the filling valve or take-out valve breaks down and gas leaks, there is no way that this leaked gas will enter the vehicle interior. It is necessary to provide at least an airtight device to cover these filling valves and take-out valves, but if both of the above are installed separately in the tank, it is necessary to provide an airtight device to cover each valve. , it was necessary to install the device over a wide area to cover both, which caused problems in terms of installation work and cost.

The present invention has been developed in view of the above-mentioned problems, and its purpose is to provide a liquefied gas filling and extraction valve that has both liquefied gas filling and extraction functions. .

[Means for Solving the Problems] In order to achieve the above object, the liquefied gas filling/unloading valve according to the present invention has an inlet inlet that opens inside the container when it is attached to a pressure-resistant gas container, and an inlet inside the container that opens inside the container. In addition to having an outflow port, there is also a gas filling port and a gas takeout port that open to the outside of the container corresponding to both openings, and a gas filling port and a gas filling port located approximately in the center between the container inflow port and the container outflow port. A gas flow path having a gas outlet and inlet communicating with the gas outlet is provided, and a gas flow is operated by the pressure of the filling gas between the gas outlet and inlet in the gas flow path and the inlet in the container. A normally-closed valve that opens the gas flow path is installed, while a normally-open valve that closes the gas flow path is installed in the gas flow path between the gas inlet and the outlet in the container. A valve body in which the valve is disposed, a valve body disposed in the valve body and communicating either one of the gas filling port and the gas outlet with the gas outlet or inlet, or blocking both from this, and the gas flow It is characterized by comprising an overflow prevention valve provided in the vicinity of the container outlet of the gas flow path, and an overfill prevention valve provided in the vicinity of the container inflow port of the gas flow path.

In the above-mentioned technical means, the valve body functions as a liquefied gas filling valve and a liquefied gas extraction valve by the operation of normally open valves and normally closed valves disposed in the gas flow path. As long as the function is fulfilled, the design may be changed as appropriate, such as the shape of the gas flow path, the method of arranging the normally open and normally closed valves, and the method of arranging the valve body.

In addition, as the above-mentioned valve body, as long as it communicates either the gas filling port or the gas outlet port of the valve body with the gas outlet/outlet port, the structure may be selected as appropriate, but the valve body may be selected according to its structure. In order to obtain a compact valve structure that is capable of opening and closing the flow path, the valve body is preferably a multi-directional ball valve that has a gas flow path and is rotatably disposed in the valve body. preferable.

[Function] A normally open valve provided in the gas flow path of the valve body prevents the liquefied gas filled into the container from flowing back into the inlet of the container, while a normally closed valve prevents the liquefied gas filled into the container from flowing back into the inlet of the container. Prevents the gas stored inside from leaking out. Thereby, the gas flow path formed in the valve body functions as a gas inflow path when gas is filled, and functions as a gas outflow path when gas is taken out.
The valve body opens and closes the gas outlet and communicates the gas filling port or the gas outlet with the gas outlet. The overflow prevention valve functions to close the gas flow path when the gas flow rate flowing out from the pressure-resistant gas container exceeds a predetermined value, while the overfill prevention valve functions to prevent liquefied gas from exceeding a predetermined value in the pressure-resistant gas container. It functions to prevent gas from flowing into the container when it is stored.

[Example] The liquefied gas filling/unloading valve of the present invention will be specifically described below based on the accompanying drawings.

FIG. 1 shows an LPG filling/unloading valve attached to an automobile LPG tank T according to a first embodiment of the present invention. This LPG filling/unloading valve is equipped with an inlet port 11 and an outlet port 13 that open into the inside of the LPG tank T when attached to the tank T. A valve body 1 is attached to a tank T via a neck ring 6, and includes a gas filling port 12 that is open and connected to a fuel filling hose, and a gas extraction port 14 to which a fuel extraction tube is connected.
and a ball bubble 2 which is rotatably incorporated into the valve body 1 and has a gas passage 21 bent at 90°.
and an overflow prevention valve 3 that is attached to the container outlet 13 and closes the container outlet 13 when the flow rate of gas flowing out from the tank T exceeds a predetermined value.
The overfill prevention valve 4 is attached to the inlet port 11 in the container and prevents liquefied gas from flowing into the tank T when the amount of gas stored in the tank T exceeds a predetermined value. .

The valve body 1 is formed with a gas flow path consisting of a gas inflow path 15 having one end at the container inlet 11 and a gas outflow path 16 having one end at the container outlet 13. Approximately in the center of the gas inflow path 1
A gas outlet 17 that communicates with the gas filling port 12 or the gas outlet 14 is opened at the confluence of the gas outlet 5 and the gas outlet 16 . Also, in the gas outlet passage 16, there is a valve body which is biased in the gas outlet direction by the elastic force of a spring, and when high pressure is applied in the tank T, this valve body is pushed into the tank T. A normally open valve 7 consisting of a valve seat seated toward the valve seat is provided, while
Inside the gas inflow path 15, there is a valve body which is biased in a direction opposite to the gas inflow direction by the elastic force of a spring, and when a high pressure is applied in the direction inside the tank T, this valve body is pushed into the tank T. A normally closed valve 8 consisting of a valve seat that is unseated toward only one is left open.

Further, the ball valve 2 is assembled into the valve body 1 so that one opening end of the bored gas passage 21 is aligned with the gas inlet/outlet 17. An operating lever 23 attached via a gland nut 18 is connected to the ball valve 2, and by rotating the operating lever 23, the gas flow path 2 is opened.
1 is aligned with the gas filling port 12 or the gas outlet 14 of the valve body 1, and the gas filling port 1
2 or the gas outlet 14 is communicated with or cut off from the gas inflow/outflow inlet 17.

In addition, the reference numeral 5 indicates a siphon tube that sucks up the LP gas G in the tank T to the outlet 13 in the container, and the reference numeral 41 indicates the LP gas G stored in the tank T.
This is a float for the overfill prevention valve 4 that detects the liquid level.

The LP gas filling/unloading valve configured as described above has a structure in which the gas inflow path 15 and the gas outflow path 16 are connected to each other.
The liquefied gas filled in the tank T has a pressure several times higher than that of the liquefied gas G stored in the tank T, so when filling the tank T, the normally open valve 7 provided in the gas outlet passage 16 and the gas The high pressure in the tank T acts on the normally closed valve 8 provided in the inlet passage 15, and the normally open valve 7 closes the gas outlet passage 16.
The normally closed valve 8 opens the gas inflow path 15 and prevents the filled liquefied gas from flowing backward through the gas outflow path 16.

Therefore, in the liquefied gas filling and extraction valve of this embodiment, the filling valve and the extraction valve are integrally formed, and the liquefied gas can be filled and extracted using only one operating lever 23.

[Effects of the invention] As explained above, according to the liquefied gas filling and extraction valve of the invention, the liquefied gas filling valve and the liquefied gas extraction valve, which are attached to a pressure-resistant gas container, have an integrated valve structure. Therefore, the number of work steps required to provide a filling valve and a take-out valve in a pressure-resistant gas container is reduced, and the number of parts is also reduced, making it possible to reduce costs.

Furthermore, it is possible to perform the filling operation and the taking-out operation of the liquefied gas using the same operating lever, which simplifies the valve operation and reduces the number of structural members, thereby reducing costs.

Furthermore, since the liquefied gas filling valve and the take-out valve are integrally constructed, the installation work when installing an airtight device that covers both is facilitated, and
It becomes possible to manufacture a compact airtight device.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing the state in which liquefied gas is filled into the LPG tank in the liquefied gas filling/unloading valve according to the first embodiment of the present invention, and Fig. 2 is a liquefied gas filling/unloading valve according to the first embodiment. FIG. 3 is a sectional view showing a state in which liquefied gas is taken out from inside the LPG tank in the combination valve. Description of symbols, 1...Valve body, 2...Ball valve, 3...Overflow prevention valve, 4...Overfill prevention valve, 5
... Siphon pipe, 7 ... Normally open valve, 8 ... Normally closed valve, 11 ... Inlet in the container, 12 ... Gas filling port, 13 ... Outlet in the container, 14 ... Gas outlet, 17 ...Gas outflow inlet, T...tank, G...
...Liquefied gas.

Claims (1)

[Claims for Utility Model Registration] (1) An inlet and an outlet in the container that open into the inside of the container when attached to a pressure-resistant gas container, and corresponding openings to the outside of the container. Equipped with a gas filling port and a gas outlet,
A gas flow path is provided between the inflow port and the outflow port in the container, and the gas flow path has a gas flow inlet approximately in the center that communicates with the gas filling port and the gas extraction port. A normally closed valve is provided between the gas outlet and the container inlet, and a normally closed valve is operated by the pressure of the filling gas to open the flow path. Inside,
A valve body provided with a normally open valve that is operated by the pressure of the filling gas and closes the gas flow path, and one of the gas filling port and the gas outlet provided in the valve body communicating with the gas inlet and outlet. an overflow prevention valve provided near the outlet of the gas flow path in the container; and an overfill prevention valve provided near the inflow port of the gas flow path in the container; A combined liquefied gas filling and extraction valve characterized by being equipped with. (2) The liquefied gas filling/unloading valve according to claim 1, wherein the valve body is a multi-directional ball valve having a gas flow path and rotatably disposed in the valve body.