CN112483692B

CN112483692B - Automatic cut-off valve for quantitative supply and overflow of liquefied petroleum gas

Info

Publication number: CN112483692B
Application number: CN201910857401.1A
Authority: CN
Inventors: 申一换
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2022-10-04
Anticipated expiration: 2039-09-11
Also published as: CN112483692A

Abstract

The invention provides an automatic cut-off valve for quantitative supply and overflow of liquefied petroleum gas, comprising: a valve stem cover; a regulating valve combined with the upper end of the valve rod cover; a valve rod combined with the lower end of the regulating valve and moving in the valve rod cover; the cylinder is arranged in the valve rod cover; opening and closing the ball; a cylinder support region; and a rubber gasket. It is possible to always discharge a certain amount of liquefied petroleum gas from the tank regardless of the length of time the tank is used, and automatically cut off the gas flowing out from the tank in the event that the tank falls down to cause gas leakage or the gas excessively flows out.

Description

Automatic cut-off valve for quantitative supply and overflow of liquefied petroleum gas

Technical Field

The present invention relates to a valve for a liquefied petroleum gas container, and more particularly, to an automatic shutoff valve which can discharge a predetermined amount of liquefied petroleum gas from a tank and automatically shut off supply of the predetermined amount of liquefied petroleum gas discharged and an overflow of the liquefied petroleum gas when excessive gas flows out of the tank.

Background

Generally, gas burners used in homes or businesses include cooking utensils for kitchen use, gas fan heaters, gas furnaces, gas boilers, gas water heaters, and the like, and are widely classified into various types of gas, such as liquefied natural gas or liquefied petroleum gas, which is supplied from a gas supply company to a desired area through a transfer pipe buried underground, and is finally supplied to each home or business office through a gas pipe and used in connection with the gas appliances, and liquefied petroleum gas is supplied from a gas tank separately placed outdoors in each home or business office through a connection hose to the inside of a room and used in connection with the gas appliances.

When such liquefied natural gas or liquefied petroleum gas is supplied to a gas supply pipe such as a gas pipe or a hose in a room such as a home or a business office, an intermediate valve that can forcibly supply and shut off gas needs to be installed in a mandatory manner before being connected to a gas appliance. In addition, the related law provides that an overflow shut-off valve is installed to automatically shut off gas when the hose is separated from the gas tank or the hose is damaged to cause excessive gas leakage or the hose supplying gas is abnormal to cause excessive gas outflow.

For example, in the "gas opening and closing device" of the granted patent No. 302971, springs are installed at the upper and lower portions of a circular plate which is installed at the center of a support shaft penetrating the center of a cylinder support piece located at the lower end of the opening and closing device, and the springs expand and contract according to the gas pressure and move the support shaft up and down so that a gas cutoff valve fixedly installed at one side end of the support shaft is opened or the discharge port is blocked, and since the support shaft is formed of a long and thin wire, there are problems such that the support shaft is bent when recovering the gas and refilling, and the circular plate is caught at the lower end of a protrusion formed at the inner peripheral surface of the central portion of the cylinder when returning to the original position after refilling.

The applicant has developed an overflow shutoff valve for a liquefied petroleum gas container to solve the above problems, and has issued patent No. 756651. In the above patent, a cylinder having a cut groove formed in an up-and-down direction is inserted into a shut valve, a cylinder support region for supporting the cylinder is coupled to a lower end portion of the shut valve, and a spring and an opening and closing ball are sequentially provided on an upper portion of the cylinder support region, so that the spring is extended and contracted according to a gas pressure and a gas flow direction, and the opening and closing ball opens and closes a gas discharge port, thereby blocking the gas discharge port and shutting off the gas flow when the gas abnormally excessively flows out in a normal gas supply process.

However, the overflow shutoff valve of the above patent has the following problems, which are completely unexpected, due to its long-term use. First, the overflow cut-off valve can be connected with the gas pitcher of certain specification and use, but because the work of discharging the gas in using the gas pitcher again with gas frequently and heavily, not only produce the deformation of spring, the spring constant also can change and lead to the change of flow in addition, and according to atmospheric pressure, the flexible length of spring can become different, so can produce the problem, for example, not only can't discharge quantitative gas, can't adjust the discharge amount moreover.

Second, a coil spring of a certain length made of a thin wire is installed at an upper portion of the cylinder supporting region, and when gas is filled in the gas tank, the coil spring is generally installed at 10kg/cm ² Is rapidly charged at a pressure of 2 to 2.7kg/cm when gas is discharged from the gas tank ² The pressure applied to the spring during filling and discharging is different, and the spring expands and contracts in opposite directions, and the spring deforms if used for a long time, and the gas is discharged at a flow rate different from the originally set discharge rate.

Thirdly, after the rubber packing ring is inserted into and combined with the packing ring cover, the packing ring cover is placed on the upper portion of the cylinder, the rubber packing ring is installed between the upper portion of the cylinder and the lower end of the gas inlet and outlet hole formed on the valve rod, and after the opening and closing ball and the spring are sequentially inserted into the cylinder, a series of work of screwing the cylinder support region to the lower portion of the valve rod is very troublesome, and the packing ring cover is separated from the upper portion of the cylinder and falls off in the work process of inserting the packing ring cover into the valve rod in the state of being placed on the upper portion of the cylinder, so that there are problems that the assembly is difficult and the time required for the assembly is increased.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an automatic shutoff valve for constant supply and overflow of liquefied petroleum gas, which can always discharge a constant amount of liquefied petroleum gas from a tank regardless of the length of time the tank is used, and which can automatically shut off the gas flowing out of the tank when the tank falls down and gas leaks or excessively flows out.

Another object of the present invention is to provide an automatic shut-off valve for quantitatively supplying and overflowing liquefied petroleum gas, which has a simple structure, reduces the number of parts, facilitates and accelerates assembly work, improves productivity, and reduces production cost.

The invention relates to an automatic cut-off valve for quantitative supply and overflow of liquefied petroleum gas, comprising: a valve rod cover which is provided with a gas inlet, a gas outlet and a safety valve and is provided with a regulating valve which is in threaded connection with the inner circumferential surface of the upper end part and enables the valve rod to move up and down in the regulating part; a cylinder having a hollow cylindrical shape, mounted on an inner circumferential surface of a lower portion of the adjustment portion of the valve rod cover, and having an upper cut portion and a lower cut portion formed by vertically cutting a body portion positioned at a central portion at equal intervals in a circumferential direction; an opening/closing ball that moves inside the cylindrical shape of the cylinder to restrict the discharge and inflow of gas; a cylinder support region in which a protruding support piece for supporting the opening/closing ball upward is formed at a central portion of a disk shape, flow holes are formed at equal intervals on the disk with the protruding support piece as a center, and a screw is formed on an outer circumferential surface of a side wall formed upward along an edge circumference of the disk so as to be screw-coupled to an inner circumferential surface of a lower end portion of the valve stem cover, thereby fixedly supporting the cylinder; and a rubber gasket, wherein a partition wall is formed at the lower end of the adjusting part of the valve rod cover, a gas inlet and outlet hole is formed at the center of the partition wall, and the rubber gasket is annularly arranged between the upper end part of the cylinder and the lower end of the partition wall.

Preferably, a rubber gasket is insert-mounted to a gasket insertion groove formed at an upper end portion of the upper cut portion of the cylinder.

Preferably, the opening and closing ball is placed on the upper end of the protruding support piece of the cylinder support area when gas normally flows out from the gas tank, and moves to the upper cut portion side of the cylinder when the gas flowing out from the gas tank is cut off, so that the holes of the rubber gasket and the gas inlet and outlet hole are blocked.

The automatic cut-off valve for liquefied petroleum gas provided by the invention does not adopt a spring for supporting an opening and closing ball for opening and closing a gas outlet, but uses a protruding support sheet which is formed integrally with a cylinder support area, and the protruding support sheet is a rod (rod) made of metal, so that even if the cut-off valve is used for a long time, only a certain amount of liquefied petroleum gas can be discharged from a gas tank, and if the height of the protruding support sheet is adjusted according to the discharge amount and the cut-off valve is made into various lengths, the original discharge preset amount cannot be changed even if the cut-off valve is used for a long time. When the gas excessively flows out, the opening/closing ball is moved by the gas pressure flowing out from the gas tank, and the gas outlet is automatically closed to cut off the gas flow.

In addition, a gasket insertion groove for inserting the rubber gasket is directly formed on the upper part of the cylinder, the rubber gasket is directly inserted on the upper part of the cylinder and is combined into a whole under the condition of no gasket cover, and a spring for supporting the opening and closing ball is not used, so that the number of parts is reduced, the assembly work is simple and convenient, the assembly can be carried out rapidly, the productivity can be improved, and the original production cost can be reduced.

Drawings

Fig. 1 is a sectional view showing a normal gas supply state of a gas shut-off valve of a first embodiment of the present invention.

Fig. 2 is a sectional view showing a normal gas supply state of the gas shut-off valve in the second embodiment of the invention.

Fig. 3a and 3b are schematic views of a first embodiment and a second embodiment in which a rubber gasket is mounted in a cylinder.

Fig. 4 is a schematic view of a cylinder support area.

Fig. 5 is a sectional view of the gas shut-off valve in a state where the gas supply is shut off.

Fig. 6 is a schematic view showing an operation state of the gas cutoff valve when refilling gas into the gas tank.

Description of the reference numerals:

10: gas cut-off valve

11: the stem cover 111: gas inlet

112: gas discharge port 113: safety valve

114: gas inlet and outlet holes 115: adjusting part

116: regulating valve

12: valve stem 13: cylinder

131: upper cut portion 132: body part

133: lower cut-out 134: gasket insertion groove

14: cylinder support area 141: protruding support sheet

142: gas circulation hole

15: rubber gasket 151: gasket cover

16: opening and closing ball

Detailed Description

The automatic cut-off valve for liquefied petroleum gas features that a metal rod-shaped projected support piece integrated with cylinder support area is used instead of spring for supporting the open-close ball to open and close gas outlet, so maintaining a certain gas flow rate even if the cylinder is used for a long time and automatically cutting off the gas from the cylinder if excessive gas flows out.

The gas shut-off valve 10 of the present invention basically comprises a stem cover 11, a regulating valve 116 coupled to the upper end of the stem cover 11, a stem 12 coupled to the lower end of the regulating valve 116 and moving inside the stem cover 11, a cylinder 13 mounted inside the stem cover 11, an opening and closing ball 16, a cylinder support area 14 and a rubber packing 15.

The stem cover 11 includes: the gas valve includes a gas inlet 111 coupled to an upper end of the gas tank, a gas outlet 112 for discharging gas flowing out of the gas tank into a gas appliance through a rubber hose connected to one end of the gas inlet 112, a safety valve 113 for releasing excess pressure when the pressure in the gas tank is rapidly increased, and a control valve 116 screwed to an inner peripheral surface of an upper end portion of the gas outlet and rotated by a hand of a user to move the valve stem 12 up and down in a control portion 115.

Since the partition wall is formed at the lower end of the adjustment portion 115 of the stem cover 11, the gas inlet/outlet hole 114 is formed at the center of the partition wall, and the hole penetrating in the direction of the gas outlet 112 is formed in the sidewall of the lower end portion of the adjustment portion 115 of the stem cover 11, the gas passing through the gas inlet/outlet hole 114 formed in the partition wall passes through the adjustment portion 115 and is then discharged to the rubber hose through the hole penetrating in the direction of the gas outlet 112.

The adjuster 115 is a space located below the adjuster 116, the adjuster 116 is coupled to the upper end of the stem cover 11, the outer circumferential surface of the stem 12 is in close contact with the inner circumferential surface of the adjuster 115, and the adjuster 115 moves up and down in accordance with the operation of the adjuster 116 to block the leakage of gas in the direction of the adjuster 116, and a control pin (not shown) is formed to protrude from the lower end of the stem 12 (see fig. 1).

The cylinder 13 has a hollow cylindrical shape, and upper and lower cut-out portions, which are formed by vertically cutting out cut-out grooves at equal intervals in the circumferential direction, are formed in the upper and lower portions of the central body portion. The cylinder 13 is installed at the lower portion of the separation wall formed at the lower portion of the adjustment portion 115 of the stem cover, the cylinder 13 is clamped at the inner circumferential surface of the stem cover 11, and when the sum of the sectional areas of the cut-out grooves formed at the lower cut-out portion 133 is larger than the sectional area of the gas inlet/outlet hole 114, the gas of the gas tank can be discharged at a constant pressure, and the gas can be rapidly filled when the gas tank is refilled.

The opening/closing ball 16 restricts the discharge and inflow of gas by moving inside the cylindrical shape of the cylinder 13, and when the outer diameter of the opening/closing ball 16 is slightly smaller than the inner diameter of the cylindrical shape of the cylinder 13, the opening/closing ball 16 can move inside the cylinder and allow the gas in the gas tank to flow out.

The cylinder support area 14 is configured such that a protruding support piece 141 for supporting the opening/closing ball 16 upward is formed at the center of the disk shape, flow holes 142 are formed at equal intervals around the protruding support piece 141 on the disk, and a spiral is formed on the outer circumferential surface of the side wall formed upward along the peripheral edge of the disk, and is screwed to the inner circumferential surface of the lower end portion of the valve stem cover 11, thereby fixedly supporting the cylinder 13. When the gas in the gas tank is discharged or refilled through the flow holes 142, the gas is flowed into the refill gas tank, and the number and shape of the flow holes 142 are not particularly limited.

The greatest technical feature of the present invention is that a separate spring for supporting the opening and closing ball 16 is not used, and only the protruding support piece 141 is used, and the protruding support piece 141 is a rod (rod) made of metal. In addition, since the protruding support piece 141 is a metal rod-shaped piece and does not deform, even if the gas shutoff valve 10 is used for a long time, only a predetermined amount of gas can be discharged from the gas tank, and if the protruding support piece 16 is adjusted in height and made to various lengths according to the discharge amount, there is no fear that the original predetermined amount of gas is changed.

In all the gas shut-off valves that have been used up to now, the opening and closing ball is supported by the spring, the spring is made of a thin metal wire material and is formed into a spiral shape, and regardless of the material of the metal, the spring characteristics change when the valve is used for a long time, and the shape of the spring changes, which is different from that when the valve is used just before, so that the problem that a fixed amount of gas cannot be supplied is the greatest.

Rubber gaskets

15 and 25 are mounted between an upper end portion of the cylinder 13 and a lower end of a partition wall formed at a lower end of the adjustment portion 115 of the stem cover 11, the

rubber gaskets

15 and 25 are formed in a ring shape, and the

rubber gaskets

15 and 25 may be inserted into a separate gasket cover 251 (second embodiment) or may be inserted into a gasket insertion groove 134 (first embodiment) mounted at an upper end portion of the upper cut portion 131 of the cylinder 13 for convenience of assembly and simplification of structure.

The first embodiment uses reference numerals beginning with "1" and the second embodiment uses reference numerals beginning with "2", and the first embodiment is different from the second embodiment in that the rubber gasket is directly inserted into the cylinder and is integrally mounted with the cylinder, or is inserted into a separate structure in which a separate gasket cover is placed on the upper end of the cylinder and is separated from the cylinder, and other structures are the same. Therefore, redundant description is omitted.

The operation of the gas shutoff valve 10 of the present invention will be explained below. First, when the gas normally flows out from the gas tank, as shown in fig. 1, the opening and closing ball 16 is placed on the upper end of the protruding support piece 141 of the cylinder support area, and the body portion 132 or the lower cut-out portion 133 located at the middle portion of the cylinder, since the outer diameter of the opening and closing ball 16 is smaller than the inner diameter of the cylinder body portion 132, the gas flowing into the gas inflow port 111 can normally flow out through the gap formed between the inner surface of the cylinder body portion 132 and the spherical surface of the opening and closing ball 16 or the cut-out groove formed at the lower cut-out portion 133.

If a failure such as the detachment or tearing of the rubber hose supplying the gas occurs, the gas flows out excessively, so that, as shown in fig. 5, if the gas flows out excessively from the gas outlet 112 abnormally, the gas pressure flowing into the gas inlet 111 increases instantaneously, and due to the increased gas pressure, the opening and closing ball 16 moves toward the gas inlet and outlet hole 114 at the upper end of the upper cut portion 131 of the cylinder, thereby blocking the gas inlet and outlet hole 114 and cutting off the gas flow.

As shown in fig. 6, when refilling the gas tank with gas, the opening/closing ball 16 moves toward the lower cut-out portion 133 of the cylinder according to the gas pressure refilled in the gas outlet 112, and at this time, the opening/closing ball 16 moves toward the protruding support piece 141. Since the sum of the sectional areas of the plurality of cut-out grooves formed in the lower cut-out portion 133 of the cylinder 13 is larger than the sectional area of the gas inlet/outlet hole 114, the amount of gas flowing into the gas inlet/outlet hole 114 does not delay or stagnate inside the cylinder 13, but rapidly flows toward the tank direction through the plurality of cut-out grooves formed in the lower cut-out portion 133 on the upper side of the opening/closing ball 16, and finally, the gas is rapidly refilled.

The present invention has been described above by way of examples, and the examples described in the specification are only for the purpose of describing the present invention and do not limit the technical idea of the present invention at all. Various modifications and alterations can be made by those having ordinary skill in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be construed in accordance with the appended claims, and all technical scopes included in equivalents thereof should be understood as being included in the scope of the invention.

Claims

1. An automatic shut-off valve in the time of the constant volume supply and overflow of liquefied petroleum gas, comprising:

a valve rod cover which is provided with a gas inlet, a gas outlet and a safety valve and is provided with a regulating valve which is in threaded connection with the inner circumferential surface of the upper end part and enables the valve rod to move up and down in the regulating part;

a cylinder having a hollow cylindrical shape, mounted on an inner circumferential surface of a lower portion of the adjustment portion of the valve rod cover, and having an upper cut portion and a lower cut portion formed by vertically cutting a body portion positioned at a central portion at equal intervals in a circumferential direction;

an opening/closing ball that moves inside the cylindrical shape of the cylinder to restrict the discharge and inflow of gas;

a cylinder support region in which a protruding support piece for supporting the opening and closing ball upward is formed at the center of a disk shape, flow holes are formed at the disk at equal intervals with the protruding support piece as the center, and a screw is formed on the outer circumferential surface of a side wall formed upward along the edge circumference of the disk so as to be screw-coupled to the inner circumferential surface of the lower end portion of the valve stem cover, thereby fixedly supporting the cylinder; and

a rubber gasket, which is provided with a partition wall at the lower end of the adjusting part of the valve rod cover, is provided with a gas inlet and outlet hole at the center of the partition wall, and is annularly arranged between the upper end part of the cylinder and the lower end of the partition wall;

the outer peripheral surface of the valve rod is tightly attached to the inner peripheral surface of the adjusting part, and the outer diameter of the opening and closing ball is smaller than the inner diameter of the body part of the cylinder;

the rubber gasket is inserted into and mounted to a gasket insertion groove formed at an upper end portion of the upper cut portion of the cylinder.

2. An automatic shut-off valve for the constant supply and flooding of liquefied petroleum gas as claimed in claim 1, wherein said opening and closing ball is placed on the upper end of said protruding support piece of said cylinder support area when gas normally flows out of the gas tank, and when the gas flowing out of the gas tank is cut off, said opening and closing ball moves to the upper cut portion side of said cylinder, so that the holes of the rubber gasket and the gas inlet and outlet hole are blocked.