JPS625556Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gas cutoff device for preventing gas leak accidents, and in particular, when the main valve is closed, the main flow path for supplying gas to appropriate gas combustion appliances through the main valve is shut off. Even if the main valve is opened again, the shutoff state will not be released unless the branch valve mechanism is operated, thereby preventing gas leakage even if the supply cock of the gas combustion appliance remains open. Regarding.

The object of the present invention is to provide a main flow path for supplying gas to a suitable gas combustion appliance through a main valve, and a main flow path provided at an appropriate location within the main flow path, through which gas is directed to the gas combustion appliance. When the gas is flowing, the main flow path is maintained in an unblocked state by the gas pressure caused by this flow, and when the main valve is closed and the gas pressure due to the gas flow decreases, the main flow path is a control valve for displacing to a cutoff position in which the control valve is in a cutoff state; and a control valve for displacing the control valve to the non-blocking position by changing gas pressure applied to the control valve when the control valve is in the cutoff position. an appropriate number of bypass channels provided for the purpose of gas flow; and a branch provided at a branch position between the main channel and the bypass channel in the direction of the main valve, and for controlling the flow of gas to each of the channels. The present invention provides a gas cutoff device comprising a valve mechanism.

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

In Fig. 1, 1 is the supply valve 3 from the main valve 2.
This is a main channel for sending gas to a suitable gas combustion appliance 4 at the end, and has a vertical portion 1a and a downwardly inclined portion 1b. 5 is a stop provided at the top end of the vertical portion 1a; 6 is a guide wall extending from the bottom of the inclined portion 1b to cross the vertical portion 1a and having a large number of communicating holes therethrough; 7 is a valve receiving portion provided on the inclined portion 1b. A control valve 8 is spherical and lightweight enough to be moved by gas pressure, and is movably disposed in a space S in the main flow path 1 partitioned by the guide wall 6 and the valve body receiver 7. , which closes the main flow path 1 by coming into close contact with the valve receiving portion 7. Reference numerals 9 and 10 designate bypass flow paths that communicate with the vertical portion 1a and the inclined portion 1b without passing through the space S within the main flow path 1. Reference numeral 11 denotes a branch valve mechanism provided at a branch position of each of the bypass channels 9 and 10 in the vertical portion 1a;
A first valve (not shown) that controls communication between the vertical part 1a in the space S direction and the bypass flow path 9, and a second valve (not shown) that controls the communication between the vertical part 1a in the space S direction and the bypass flow path 9, and a third controlling the communication between the bypass flow path 10 and the bypass flow path 10.
valve (not shown).

Next, the operation of this embodiment will be explained. Under normal combustion conditions, main cock 2 and supply cock 3
is in the open state, and the branch valve mechanism 11 is in the open state.
With the first valve open and the second and third valves closed, gas flows through the main flow path 1 from the vertical portion 1a toward the inclined portion 1b. At this time, the control valve 8 disposed in the space S is in the non-blocking position (solid line state) where it is pushed up to be located in the stop portion 5 by the pressure caused by the gas flow described above. Gas flow will not be disrupted. When the main valve 2 is closed, the above-mentioned gas flow ceases, so the gas pressure against the control valve 8 also disappears, and it falls in the space S due to its own weight, sticks to the valve receiver 7, and continues the main path 1. By moving to the cutoff position (virtual line state), combustion in the gas combustion appliance 4 is stopped. Even if the main valve 2 is opened in this state, the main flow path 1 is shut off by the control valve 8, and each bypass flow path 9,
10 is also in the shut-off state, so there is no gas leakage even if the supply pot 3 remains open.

To supply gas to the gas combustion appliance 4 again, first, the first and second valves of the branch valve mechanism 11 are switched so that the first valve is in a closed state and the second valve is in an open state. , the third valve remains closed.
Then, the vertical portion 1a inside the space S and communicating therewith
The gas remaining inside escapes toward the gas combustion appliance 4 through the bypass passage 9. This leaked gas causes a gas leak, but the amount is small and there is no risk of an accident occurring. Also,
If the gas combustion appliance 4 is ignited at this time, the gas will be extinguished once the gas mentioned above has completely escaped, and it can be confirmed that the gas in the space S has been vented. next,
After closing the supply tank 3, the first valve of the branch valve mechanism 11 is maintained in the closed state, while the second and third valves are kept closed.
The second valve is in the closed state and the third valve is in the open state. Then, the gas passes through the vertical portion 1a from the main valve 2 direction, exits the bypass passage 10, and flows into the inclined portion 1b. The control valve 8 is pushed up by the inflowing gas pressure and is again displaced to the stop portion 5, which is the non-blocking position.
Subsequently, the first valve of the branch valve mechanism 11 is switched to the open state, the second valve is maintained in the closed state, and the third valve is switched to the open state.
When the valve is switched to the closed state, this branch valve mechanism 11 becomes a normal state, and gas passes through the main passage 1. Therefore, when the supply pot 3 is opened, gas is supplied to the gas combustion appliance 4.

Next, another embodiment will be described based on FIGS. 2 to 5 of the accompanying drawings.

Reference numeral 12 denotes a main flow path, a main valve 13 is provided at one end thereof, and a suitable gas combustion appliance 15 is attached to the other end via a supply cock 14. The main flow path 12 is composed of a vertical portion 12a, an inclined portion 12b, and a return portion to be described later, similar to the first embodiment. Reference numeral 16 denotes a supply tank (not shown) for supplying a gas combustion appliance, which is provided at the terminal branch portion of the inclined portion 12b. 17 is an upper valve receiving portion provided at the upper end of the vertical portion 12a; 18 is the inclined portion 1;
A lower valve receiving portion 19 is provided near the vertical portion 12a of 2b, and 19 is a guide wall having a number of communicating holes extending from the bottom surface of the inclined portion 12b across the vertical portion 12a. be. and these 3
A space S' is formed by the main channel 12 section partitioned by two members. Reference numeral 20 denotes a control valve having a spherical shape and light enough to be moved by gas pressure, which is movably arranged in the space S'. Road 1
is in a non-blocking state, and when it is in a blocking position in close contact with the lower valve receiving portion 18, the main flow path 1 is in a blocking state. 12c is a return section 21, 22 for returning gas from the upper end of the vertical section 12a to the main valve 13 side of the vertical section 12a, which communicates the vertical section 12a and the inclined section 12b without passing through the space S'. A branch valve mechanism 23 is provided at a portion where each of these flow paths communicates with the vertical portion 12a. The branch valve mechanism 23 includes a first valve (not shown) that controls communication between the vertical portion 12a and a second valve (not shown) that controls communication between the return portion 12c and the bypass flow path 21.
Space near the main valve 2 of the vertical portion 12a and the bypass flow path 2
and a third valve (not shown) that controls communication between the two. Reference numeral 24 denotes a shutoff point located between the communicating ends of each of the bypass channels 21 and 22 in the inclined portion 12b.

Next, the operation of this embodiment will be explained. In the normal combustion state shown in Figure 2, the main valve 1
3. The shutoff pot 24 and the supply pot 14 are in an open state, and the branch valve mechanism 23 is in a state where the first valve is open and the second and third valves are closed, and the gas flows vertically through the main flow path 12. The water flows from the portion 12a toward the inclined portion 12b. At this time, the control valve 20 disposed in the space S' is in the non-blocking position where it is pushed up to come into close contact with the upper valve receiving part 17 due to the pressure caused by the gas flow described above, The flow is not blocked, and gas does not flow into the return section 12c. Here, when the main valve 13 is closed as shown in FIG. 3, the above-mentioned gas flow stops, so the gas pressure against the control valve 20 also disappears, and it falls in the space S' due to its own weight, and the lower valve receiving part 18 The main flow path 12 is displaced to the blocking position in close contact with the
By shutting off the gas combustion appliance 15, combustion in the gas combustion appliance 15 is stopped. Even if the main valve 13 is opened in this state, the main channel 12 is blocked by the control valve 20, and the bypass channels 21 and 22 are also blocked by the branch valve mechanism 23. There is no gas leak even if the valve remains open.

To supply gas to the gas combustion appliance 15 again,
First, the shutoff cock 24 is closed, and the second valve of the branch valve mechanism 23 is switched to communicate the return section 12c and the bypass flow path 21, and the first valve and the third valve are respectively in the state described above. Let me maintain
The vertical portion 12a is in the unblocked state, and the bypass passage 22 is maintained in the blocked state as shown in FIG. 4. Then, inside the space S', inside the vertical part 12a, and in the return part 12
The gas accumulated in the chamber c passes through the vertical section 12a, the return section 12c, and the bypass passage 21 to reach the gas combustion appliance 15. If the gas combustion appliance 15 is ignited here, the gas odor will not bother the user and there will be no risk of gas leakage. Subsequently, the first valve of the branch valve mechanism 23 is closed to block the flow path from the vertical portion 12a to the return portion 12c, while the third valve is opened to create a bypass flow between the vertical portion 12a and the inclined portion 12b. Road 22
The second valve is in the state shown in FIG. 5 in which the second valve is maintained in the open state described above. By switching the branch valve mechanism 23, the gas remaining in the space S' and the vertical part 12a communicating therewith escapes from the return part 12c to the bypass flow path 21 along with the flow described above, and also Channel 2
2, the control valve 20
is separated from the lower valve receiving part 18 and the upper valve receiving part 17
Displaced to the non-blocking position in close contact with the Therefore, the inflow of gas into the return section 12c is blocked, and the gas combustion appliance 15 will soon be in the extinguished state. In other words, by this extinguished state, it can be confirmed that the control valve 20 has blocked the flow of gas into the aforementioned return section 12c. Following this, the branch valve mechanism 23 is switched again, the first valve is opened, the second and third valves are closed, and the shut-off valve 24 is opened. The state shown in the figure is reached, and the normal combustion state is restored.

In the two embodiments described above, the branch valve mechanisms 11 and 23 are constructed with three separate valves, but they may also be constructed with a single valve. It is possible, for example in the case of the second embodiment, to use a control valve 25 as shown in FIGS. 6 and 7. Here, 26 is a through hole that controls the vertical portion 12a and the communication state between the vertical portion 12a and the bypass flow path 22, and 27 is a through hole that controls the communication state between the vertical portion 12a and the bypass flow path 22.
The handle 28 is a through hole that controls the state of communication with the handle 28.
is used so that it protrudes from the surface side of the drawing,
When the through holes 26 and 27 are in the state shown in FIG. 7, each flow path is in the state shown in FIGS. 2 and 3. When this is rotated approximately 45 degrees in the rotation direction of the upper hour hand in FIG. 7, the state shown in FIG. 5 is obtained. Therefore, in this example, although it is not possible to realize the state shown in FIG. 4, there is no problem even if the state shown in FIG. It just lacks. Furthermore, the control valves 8 and 20 disposed in the respective spaces S and S' do not necessarily have to be spherical; for example, a plate-shaped valve 29 as shown in FIG. Part 1b, 1
2b, and in this case, each valve receiving part 7, 17, 18 and each guide wall 6, 19
are unnecessary, so spaces S and S' partitioned by these members are not formed. The solid line state in FIG. 8 indicates the blocking position, and the imaginary line state indicates the non-blocking position.

In this way, according to the present invention, once the main valve is closed, even if it is opened, gas will be sent to the gas-burning appliance unless the branch valve mechanism installed indoors is manually manipulated. Therefore, there is no risk of gas leakage even if the gas combustion appliance's supply tank is left open, resulting in an extremely safe effect.

Various preferred embodiments of the present invention have been described above, but it goes without saying that the present invention is not limited to the above-mentioned embodiments. Of course, many modifications can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, FIG. 1 is a schematic explanatory diagram of operation, FIGS. 2 to 5 are schematic explanatory diagrams of other embodiments, and FIG. 6 is a branch valve. FIG. 7 is a perspective view showing another embodiment of the mechanism, FIG. 7 is a cross-sectional view showing the position of the through hole, and FIG. 8 is a schematic operational explanatory diagram showing another embodiment of the control valve. DESCRIPTION OF SYMBOLS 1... Main flow path, 1a... Vertical part, 1b... Inclined part, 2... Main valve, 3... Supply pot, 4... Gas combustion appliance, 5... Stop part, 6... Guide wall, 7... …
Valve receiving part, 8... Control valve, 9, 10... Bypass flow path, 11... Branch valve mechanism, 12... Main flow path, 12
a... Vertical part, 12b... Inclined part, 12c... Return part, 13... Main valve, 14... Supply cock, 15
...Gas combustion appliance, 16...Supply kettle, 17...
...Upper valve receiver, 18...Lower valve receiver, 19...Guide wall, 20...Control valve, 21, 22...Bypass flow path, 23...Branch valve mechanism, 24...Shutoff cock, 25... ...Control valve, 26...Through hole, 27...Through hole, 28...Handle, 29...Plate valve, S, S'...
space.

Claims (1)

[Scope of utility model registration request] A main flow path for supplying gas to a suitable gas combustion appliance through a main valve, and a main flow path disposed at an appropriate location within the main flow path, when gas is flowing through the main flow path toward the gas combustion appliance. is in a non-blocking position where the main flow path is maintained in a non-blocking state by the gas pressure caused by this flow, and when the main valve is closed and the gas pressure due to the gas flow decreases, the main flow path is set to a cutoff state. a control valve that is displaced to the non-blocking position, and for causing gas to flow when the control valve is in the blocking position to displace it to the non-blocking position by changing the gas pressure applied to the control valve. It comprises an appropriate number of bypass channels provided, and a branch valve mechanism provided at a branch position of the main channel and the bypass channel in the direction of the main valve, and for controlling the flow of gas to each of the channels. A gas cutoff device featuring: