JPH0128270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas tank equipped with an overflow prevention valve that automatically shuts off a gas passage when an excessive outflow of gas occurs.

[Conventional technology]

When using gas appliances, if raw gas leaks abnormally due to disconnection of a rubber hose, etc., it can cause an extremely dangerous situation that could lead to an explosion, fire, or gas poisoning. It is necessary to stop it immediately.

For this reason, a gas excess flow prevention valve (gas fuse) is installed in the middle of the gas passage in the gas tank, and the gas passage is shut off at the same time as the gas overflow occurs to stop the outflow.

By the way, overflow prevention valves that use lightweight spheres, which are well known in the past, are extremely unstable, so they cannot be opened instantaneously in gas appliances where the gas flow rate is automatically controlled. If it is done,
The present applicant filed Japanese Patent Application No. 57-185823 because of the inconvenience that wave-like vibrations occur in the gas pressure, causing the sphere to instantly jump up and close the valve, stopping the normal operation of the gas appliance. No. 2, we proposed an overflow prevention valve using a plate-shaped valve plate and solved the above-mentioned disadvantages.

Overflow prevention valves that use a plate-shaped valve plate use the drop in gas pressure acting on the outer surface of the valve plate and the gas pressure acting on the back side to move the valve plate to the valve seat when gas overflow occurs. The valve plate is pressure-contacted to block the gas passage, and the valve plate is relatively stable against minute changes in gas flow rate, does not jump up instantaneously due to wave-like vibrations in the gas flow, and is automatically controlled. Excess flow prevention can be reliably achieved even in type gas appliances.

In addition, returning the valve plate to the open position requires only equalizing the upper and lower gas pressures of the valve plate, so the structure for returning is simple and the gas tank can be made smaller.

By the way, the protruding direction of the end of the gas pipe to which the gas tank is attached is not constant.

[Problem to be solved by the invention]

For this reason, when using a single-structure gas tank,
The direction of movement of the internally built overflow prevention valve varies depending on the gas piping conditions.
If the overflow prevention valve, which is set to operate with a predetermined sensitivity in a fixed direction of movement, changes direction, the purpose of preventing gas overflow may not be achieved.

In addition, it is possible to manufacture a kettle with a different direction for installing the overflow prevention valve in order to correspond to the piping conditions.
Problems arise in that there are an extremely large number of types of kotuku, production costs are high, and product management is complicated.

The object of this invention is to solve the above-mentioned problems by making it possible to install the overflow prevention valve so that the direction of movement of the overflow prevention valve is constant regardless of the direction of the end of the gas piping, and to ensure accurate movement regardless of the piping conditions. It is an object of the present invention to provide a gas tank equipped with an overflow prevention valve that provides an overflow prevention function.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a screw hole for attaching to a gas pipe and a hose connection tube arranged on the same axis in a main body, and a threaded hole for attaching to a gas pipe and a hose connection tube are provided in the main body. In the middle of the gas passage provided to conduct the connecting tube, there is a closure whose rotational axis intersects at right angles to the axis of the mounting screw hole, and which opens and closes the gas passage by turning with a knob. an overflow prevention valve located on the upstream side of the passage; A gas outlet opens into the valve chamber at a position facing the surface of the valve plate, and the periphery of the opening becomes the valve seat that the surface of the valve plate comes into contact with, and the gas outlet connects to the upstream side of the gas passage. A gas inlet opens into the valve chamber so as to face the surface of the valve plate around the outer circumference of the gas outlet, and a gas inlet is built into the valve chamber so as to press the valve plate away from the valve seat, and the gas inlet opens from the gas inlet. The overflow prevention valve consists of a spring with elasticity that allows the valve plate to move into contact with the valve seat due to the suction force caused by the excessive flow of gas flowing at the outlet, and the axis of the valve plate in the direction of movement is located in the mounting screw hole. It intersects the axis of the closure at right angles, and is arranged in a positional relationship at right angles to the axis of rotation of the closure.

[Effect]

The screw hole for mounting to the piping and the hose connection tube are arranged on the same axis on the main body of the Kotuku, and there is a closure in the middle of the gas passage that connects the screw hole for installation and the hose connection tube, and a closure on the upstream side of the gas passage of this closure. The axes of the overflow prevention valve and the overflow prevention valve intersect at right angles to the axis of the mounting screw hole, and the axes of the closer and the overflow prevention valve are positioned at right angles, so overflow can be prevented. By rotating the entire valve around its axis, the mounting screw hole can be aligned with the direction of the end of the gas pipe, and the direction of movement of the excess flow prevention valve can be adjusted regardless of the direction of the end of the gas pipe. Allows for consistent installation.

In addition, the overflow prevention valve is designed to prevent gas from overflowing.
The suction force caused by the excessive flow of gas from the gas inlet to the gas outlet presses against the valve seat, blocking the gas passage and stopping the outflow of gas.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the first embodiment shown in FIGS. 1 to 3, the main body 1 has a threaded hole 2 for attachment to piping at one end, and a hose connection tube 3 at the other end.
A gas passage 4 communicating between the mounting screw hole 2 and the hose connection tube 3 is provided, and in the middle of this gas passage 4,
A closer 5 and an overflow prevention valve 6 are installed on the upstream side of the gas passage 4 than the closer 5.

As shown in FIG. 1, the above-mentioned closure 5 is installed so as to slide and turn into a tapered hole 7 bored from the top of the gas passage 4 so as to be perpendicular to the gas passage 4. , the gas passage 4 is made conductive and cut off by the through hole 9. The rotational axis of the closure 5 intersects the axis of the mounting screw hole 2 at right angles.

The overflow prevention valve 6 has a valve box 11 airtightly screwed into a horizontal hole 10 bored in the side surface of the main body 1, and a circular plate-shaped valve is inserted into the valve chamber 12 provided inside the valve box 11. The valve plate 13 is assembled so as to be movable in the axial direction, that is, in the horizontal direction, in an upright state.

The overflow prevention valve 6 is arranged such that the axis of the valve plate 13 in the moving direction intersects the axis of the mounting screw hole 2 at right angles and is perpendicular to the axis of rotation of the closure 5. There is.

The part between the closure 5 of the gas passage 4 provided in the Kotuku body 1 and the overflow prevention valve 6 is bent at a right angle toward the horizontal hole 10 on the way, and the outer periphery thereof is formed into a bent cylindrical part 14, and this cylindrical part The open end of 14 faces inside the valve chamber 12 in a coaxial arrangement.

Inside the bent cylinder part 14, with respect to the overflow prevention valve 6,
The open end becomes a gas outlet 15 connected to the downstream side of the gas passage 4, and a gas inlet 16 connected to the upstream side of the gas passage 4 is provided between the outer periphery of the bent cylinder part 14 and the open end of the valve chamber 12. The end portion facing into the valve chamber 12 serves as a valve seat 17 against which the valve plate 13 comes into contact.

The part of the gas inlet 16 that opens into the valve chamber 12 faces the surface of the valve plate 13, and the gas flows from the gas inlet 16 through the valve chamber 12 to the gas outlet 15. When flow occurs, valve plate 1
3, the valve plate 13 is attracted toward the gas outlet 15, and comes into contact with the valve seat 17, thereby blocking communication between the valve chamber 12 and the gas outlet 15, and preventing the gas from flowing out. will be stopped.

A spring 1 is provided in the valve chamber 12 to provide an elastic force that holds the valve plate 13 upright and constantly moves it away from the valve seat 17.
8 is incorporated, and at the inner end of the valve chamber 12 is a contact area reducing member that receives the valve plate 13 with a plurality of protrusions 19 and prevents the valve plate 13 from coming into close contact with the valve chamber 12 and becoming difficult to move. 20 are provided.

The spring 18 is set to have elasticity that allows the valve plate 13 to move so as to come into contact with the valve seat 17 due to the suction force caused by the excess gas flow.

Therefore, the valve plate 13 is movable in the horizontal direction along the axis between the valve seat 17 and the reducing member 20 within the valve chamber 12 .

Note that the valve plate 13 is formed using, for example, a metal plate or a synthetic resin plate, and the surface may be coated with synthetic rubber, synthetic resin, etc. to improve airtightness when it contacts the valve seat 17. Often, non-stick resin powder may be mixed into these coating materials.

In addition, the detection sensitivity and delay time of gas overflow by the valve plate 13 are determined by the diameter and weight of the valve plate 13, the spring 1
8, the stroke of movement of the valve plate 13 in the horizontal direction, the distance between the inner diameter of the valve chamber 12 and the outer diameter of the valve plate 13, etc.

In order to return the valve plate 13, which presses against the valve seat 17 and shuts off the gas passage 4, to the open position, as shown in FIG. The closing position of the closure 5 is to connect the through hole 21 that connects the gas passage 4 upstream of the overflow prevention valve 6 and the bottom of the tapered hole 7 to the gas passage 4 upstream of the closure 5. A through hole 22 that communicates with the inside is provided.

In the above-mentioned gas tank, the rotation axis A of the closure 5 is connected to the mounting screw hole 2 and the hose connection tube 3.
perpendicular to the axis B of , as shown in Figures 1 and 2,
The axis C of the valve plate 13 of the overflow prevention valve 6 in the moving direction is perpendicular to the axis A of the closure 5 at a distance, and is arranged in a positional relationship perpendicular to the axis B.

Therefore, if the axis C of the overflow prevention valve 6 is kept horizontal and the main body 1 is rotated around the axis C, the overflow prevention valve 5 can be installed without changing the arrangement conditions. This means that no matter which direction the end of the gas pipe faces, the overflow prevention valve 6 can be installed with the axis C of the overflow prevention valve 6 horizontal. The operating conditions for overflow can be kept constant.

Note that the second example shown in FIGS. 4 and 5 shows another state in which the spring 18 is installed, which biases the valve plate 13 with elasticity to move away from the valve seat 17. In this second example, the spring 18 is assembled from the valve chamber 12 into the gas outlet 15, and the other parts are the same as the first example shown in FIGS. 1 and 2. Explanation will be omitted by assigning the same reference numerals.

The gas tank of the present invention has the above-mentioned configuration, and is connected to the end of the gas pipe through the mounting screw hole 2, and is arranged so that the axis C of the overflow prevention valve 6 is horizontal.

() When the gas flow is normal, as shown in FIG. This valve plate 1
3 is pressed toward the contact area reducing member 20, it flows out from the outlet 15 through the through hole 9 of the closure 5, and the valve plate 13 remains in the open position shown by the solid line in FIG.

() When an excessive flow of gas occurs, if excessive gas flows out from the gas appliance,
The pressure at the outlet 15 decreases, and therefore the gas pressure acting on the center of the surface of the valve plate 13 decreases, causing the valve plate 1
3 and a part of the gas flow enters the valve chamber 12.
It flows into the back surface of the valve plate 13 from between the valve plate 13 and the bottom of the valve plate 13, and moves the valve plate 13 toward the valve seat 17.

Therefore, if an excessive outflow of gas occurs, the valve plate 1
3 compresses the spring 18 and moves toward the valve seat 17,
The valve plate 13 comes into pressure contact with the valve seat 17 as shown by the dashed line in FIG. Since it acts in a pressing manner, the outflow of gas is continuously maintained.

() Return to the state where gas can flow out. With the valve plate 13 in pressure contact with the valve seat 17, after eliminating the cause of abnormal flow on the gas appliance side, turn the closure 5 to the closed position as shown in Figure 1. Since the upstream side of the gas passage 4 and the outlet 15 communicate through the through holes 21 and 22, the gas pressure acting on both sides of the valve plate 13 becomes equal, and the valve plate 13
is pushed by the force of the spring 18 and moves to the valve open position,
move away from the valve seat 17 and open the gas outlet 15;
This creates a situation where gas can escape.

〔effect〕

As described above, according to the present invention, the screw hole for attaching to the gas pipe and the hose connection tube are arranged on the same axis in the main body of the gas pipe, and the gas passage that connects the screw hole for attachment and the hose connection tube is provided. In the middle, there is provided a closure that is perpendicular to the axis of the mounting screw hole and opens and closes the gas passage by rotation with a knob, and an overflow prevention valve located upstream of this closure, and the overflow prevention valve A gas outlet facing the surface of the valve plate and a gas outlet around the valve chamber are provided in a valve chamber in which a valve plate is housed so as to be movable along the axis, and a spring is used to attach the gas outlet opening to the valve plate. The overflow prevention valve is formed with elasticity to separate from the valve seat, and the overflow prevention valve is formed so that the axis in the direction of movement of the valve plate is perpendicular to the axis of the mounting screw hole and perpendicular to the rotation axis of the closure. The overflow prevention valve can be mounted on the gas piping with the mounting screw hole facing the desired direction around the axis of the overflow prevention valve, even if the end direction of the gas piping is different. It becomes possible to cope with this by maintaining the arrangement of the objects in a certain direction.

Furthermore, even if the gas pipes are installed in different directions, a single structure can accommodate the different directions, thereby reducing manufacturing costs and simplifying product management.

Furthermore, since the overflow prevention valve is placed upstream of the closure and perpendicular to the rotation axis of the closure, it is advantageous in terms of position when assembling the overflow prevention valve into the Kotsuk body. The occurrence of protruding parts to the outside can be reduced, and the size of the kettle body can be reduced.

In addition, in the overflow prevention valve, the valve plate is pushed away from the valve seat by a spring, and the gas inlet is opposed to the surface of the valve plate, so the gas flow acts on the surface of the valve plate and retreats. When pressed into position, the valve plate is relatively stable to small changes in normal gas flow rate and can only be operated accurately when an overflow occurs.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional front view showing a first example of a gas tank according to the present invention, Figure 2 is a cross-sectional plan view of the same as above with the closure in the open position, and Figure 3 is an enlarged view of the overflow prevention valve in the same as above. FIG. 4 is a vertical sectional front view showing a second example with a different spring installed state, and FIG. 5 is a lateral sectional view showing the same as the above in an open state. 1... Kotoku body, 2... Screw hole for mounting, 3...
...Hose connection pipe, 4...Gas passage, 5...Closer,
6... Excess flow prevention valve, 11... Valve box, 12... Valve chamber, 13... Valve plate, 15... Gas outlet, 16...
...Gas inlet, 17...Valve seat, 18...Spring.

Claims (1)

[Claims] 1 The screw hole for attaching to the gas pipe and the hose connection tube are arranged on the same axis in the body of the gas pipe, and the screw hole for attaching to the gas pipe and the hose connection tube are provided in the middle of the gas passage provided in the body of the body so as to communicate with the hose connection tube. , a closure whose rotational axis intersects at right angles to the axis of the mounting screw hole, and which opens and closes the gas passage by rotation with a knob, and an overflow prevention valve located upstream of the closure in the gas passage. The overflow prevention valve is provided with a valve plate, a valve chamber in which the valve plate is housed so as to be movable in the axial direction, and a position facing the surface of the valve plate so as to connect the gas to the downstream side of the passage. A gas outlet opens into the valve chamber, and the periphery of the opening becomes the valve seat against which the surface of the valve plate comes into contact.The gas outlet is connected to the upstream side of the gas passage and faces the surface of the valve plate around the outer periphery of the gas outlet. A gas inlet opens into the valve chamber, and a valve plate is built into the valve chamber to press the valve plate away from the valve seat. The overflow prevention valve is constructed of a spring with elasticity that allows movement to come into contact with the valve seat, and the axis of the valve plate in the direction of movement intersects the axis of the mounting screw hole at right angles, and the rotation of the closure A gas tank with an overflow prevention valve located perpendicular to the shaft center.