JPS63270985A - Closing valve for gas pipe line of gas apparatus - Google Patents

Abstract

PURPOSE:To produce a gas pipe line closing valve closing surely at the time of going out of a gas burner by movably providing a valve seat. CONSTITUTION:The primary valve body 3, which an electromagnet 10 having losed its electromagnetic force at the time of going out of a gas burner causes fo be pressed against a valve seat 19, is arranged on the upstream side of the valve seat 19. The secondary valve body 27 to regulate gas quantity by normal valve closing operation is arranged on the downstream side of the valve seat 19. The valve seat 19 provided movably is pressed by the secondary valve body 27 during valve closing to move upward, and thereby abuts on the primary valve body 3 to close a pipe line. The secondary valve body 27 lowers during valve opening, and the valve seat 19 also lowers to separate from both valve bodies 3, 27. When the going out of the gas burner occurs in this state, the primary valve body 3 is energized by a spring 8 to lower, and thereby abuts on the valve seat 19 to close the valve. The electromagnet 10 turned off therefore closes the valve surely to produce high safety.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a gas pipe opening/closing valve that controls the amount of gas in gas appliances, and in particular, to a gas pipe opening/closing valve that automatically closes the gas pipe when a gas burner goes out. This relates to a gas pipe opening/closing valve for gas appliances, which is equipped with a safety fence that closes.

[Prior Art] Conventionally, in a gas pipe opening/closing valve for this type of gas appliance, a valve body is energized toward a valve seat in the direction of closing the gas pipe, and is pushed up with a rod from the valve seat side. When the gas burner goes out, the electromagnet acting on the rod is turned off, the rod becomes free, and the valve body is pressed against the valve seat by the energizing force, closing the gas pipe. It was like that.

[Problems to be solved by the invention] In the conventional gas line opening/closing valve of the gas appliance described above, the valve body is pushed up from the valve seat side, so the structure is complicated and the manufacturing cost is high. Even if the electromagnet that acts on the rod is turned off, if the rod does not return due to some malfunction, the gas pipe will not close, and there is a risk that raw gas will leak if the gas burner goes out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas pipe opening/closing valve for a gas appliance that eliminates such conventional drawbacks, has a simple structure, and is safe and does not cause gas leakage.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a gas pipe opening/closing valve for a gas appliance according to the present invention includes a valve seat that is provided in a gas pipe so as to be movable back and forth, and a gas pipe. A valve element is energized toward the valve seat in the direction of closing the passage, an electromagnet that draws and fixes the valve element against the energizing force, and the gas pipe is opened and closed by driving the valve seat forward and backward. It is characterized by comprising a valve seat driving means.

[Operation] Normally, the valve body is fixed, and the valve seat is driven forward and backward by the valve seat driving means to open and close the gas pipe. When an abnormality occurs, such as the gas burner going out, the electromagnet is turned off, and the valve body is pressed against the valve seat by the energizing force, thereby closing the gas pipe.

[Example] An embodiment of the present invention will be described based on FIG.

FIG. 1 shows a state in which the gas pipe opening/closing valve of the gas appliance closes the gas pipe. Reference numeral 1 denotes a gas pipe line formed by being surrounded by a pipe wall 2, and 3 a valve element that contacts a valve seat 4 to open and close the gas pipe line 1. A housing 5 is formed in the gas pipe line 1 above the valve seat 4, and a magnetic body 7 connected to the valve body 3 via the valve shaft 6 is disposed within the housing 5.

Further, a first coil spring 8 is inserted between the housing 5 and the valve body 3, and the valve body 3 is moved toward the valve seat 4 with a relatively weak force in the direction of closing the gas pipe l. It is energized.

An electromagnet 9 is fixedly installed within the housing 5. 10 is an electromagnetic coil, 11 is a yoke made of a magnetically conductive member, 12 is a + side electrode connected to a cord 13, and 14 is a side electrode grounded to the podium. These are integrally attached to a mounting bracket 15, and a nut It is fixed to the pipe wall 2 by 16.

The electromagnetic coil 10 is connected to a thermocouple (not shown) that receives heat from the gas burner, and during ignition of the gas burner, the electromagnetic coil lO is energized by the electromotive force of the thermocouple, and a magnetic The body 7 is attracted and fixed to the electromagnet 9. 17 and 18 are sealing materials for airtightness.

The valve seat 4 is a cylindrical body 19 that is provided in the gas pipe l so that it can move forward and backward.
is formed on the upper end side. And, the cylinder 19 is
The second coil spring 20 inserted between the housing 5 is biased downward with a medium force, and the gas pipe l
It is set up so that it can move forward and backward freely. 21 is an O-ring that seals between the pipe wall 2 and the cylindrical body 19; 22 is a presser ring that presses the O-ring; and 23 is a spring retaining ring that fixes the presser ring 22.

A second valve seat 24 is formed on the lower end side of the cylindrical body 19, and a similar valve seat 25 is formed on the conduit wall 2 around the second valve seat 24. The second valve body 27, which is urged upward with a strong force by the third coil spring 26, is in contact with the second valve seat 24 and the valve receiver 25 at the same time. Therefore, in the state shown in FIG. 1, the flow of gas is doubly blocked at the valve body 3 and at the second valve body 27, and at the second valve body 27, the seal is double-layered, both inside and outside. It has become. Also, a rod 28 directly connected to the second valve body 27
is pushed down by a valve seat driving means 31 such as a water governor (or an electric motor) via an arm 30 that is rotatable about a shaft 29, and pushed up by the force of the third coil spring 26. 32 is an O-ring for sealing.

33 is a gas governor that keeps the differential pressure in the front and rear gas pipes constant; when gas is not flowing, the pressure regulating valve 34 is pushed upward by a coil spring 35 and is fully open; when gas is flowing, the pressure regulating valve 34 is fully opened; , moves to an intermediate position where the front and rear gas pressure difference and the spring force of the coil spring 35 are balanced.

36 is a diaphragm for the sea, 37 is a spring pressure adjustment screw, and 38 is a switch for ignition (re-ignition), which is operated by a protrusion 39 that cooperates with the pressure regulating valve 34. In the state shown in FIG. 38 is OFF.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 to 4.

FIG. 1 shows a state in which the main switch is OFF, and the gas pipe line 1 is completely blocked.

That is, the valve body 3 and the valve seat 4 are in contact with each other, and the second valve body 27 is in contact with the second valve seat 24 and the valve receiver 25, so that the gas pipe 1 is closed.
is blocked. There are no sliding parts in the gas-filled portion upstream of the valve body 3, and therefore the risk of gas leakage is extremely low. Furthermore, since the reference position for operation is when the valve seat 4 is pressed against the valve body 3, the starting operation when the device is turned on is easy and the operation can be started quickly.

FIG. 2 shows that the valve seat driving means 31 operates to move the second valve body 27.
The cylinder body 19 is pushed down by the second coil spring 20, and the space between the valve body 3 and the valve seat 4 is opened. However, the second valve body 27 and the second valve seat 24 are still in contact with each other, and the gas pipe line 1 is not open.

FIG. 3 shows the state in which the second valve body 27 is completely lowered. This is a normal combustion condition. At this time, the space between the second valve body 27 and the second valve seat 24 is also completely opened. Furthermore, at the moment when the pressure regulating valve 34 moves to a position where it balances the spring force of the coil spring 26 and the pressure regulating valve 34 begins to move, that is, at the moment when gas begins to flow, the switch 38 is turned ON and the gas burner is ignited (re-ignited). be done.

FIG. 4 shows a state in which the gas burner is turned off. In this case, the power to the electromagnetic coil 10 is cut off, the electromagnet 9 is turned off, and the valve body 3 is pushed to the valve seat by the biasing force, regardless of the position of the cylinder body 19 (that is, position a of the valve seat 4). 4 and the gas pipe line l is blocked.

In addition, in the above embodiment, the cylindrical body 1 on which the valve seat 4 is formed is
Although the second valve seat 24 is formed at 9 so that the second valve body 27 comes into contact with the second valve seat 24, the present invention is not limited thereto. The means 31 and the cylindrical body 19 may be directly connected to each other.

[Effects of the Invention] According to the gas pipe opening/closing valve for gas appliances of the present invention, the gas pipe is opened and closed by driving the valve seat forward and backward, and the electromagnet portion is prevented from moving back and forth, so the structure is simple. The manufacturing cost is low, and when the electromagnet is turned off, the valve body is always pressed against the valve seat and the gas pipe is blocked.
Even if the gas burner goes out, there is no risk of raw gas leaking, and it has excellent effects such as extremely high safety.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIGS.
Each figure is a sectional view showing different operating states of the embodiment. DESCRIPTION OF SYMBOLS 1... Gas pipe line, 3... Valve body, 4... Valve seat, 8...
...Coifre spring, 9...Electromagnet, 31...
Valve seat drive means.

Claims (3)

[Claims] (1) A valve seat provided in a gas pipeline so as to be able to move forward and backward; a valve body that is biased toward the valve seat in a direction that closes the gas pipeline; and a valve body that resists the biasing force. A gas line opening/closing valve for a gas appliance, comprising an electromagnet that attracts and fixes the valve seat, and a valve seat driving means that opens and closes a gas line by driving the valve seat forward and backward. (2) The valve seat is formed on one end side of a cylindrical body that is provided in a gas pipeline so as to be movable back and forth, and the second valve seat is formed on the other end side of the cylindrical body, and the valve seat is formed on the other end side of the cylindrical body. The seat driving means has a second valve body at its end, and the second valve body abuts the second valve seat, thereby doubly blocking the gas pipe. A gas pipe opening/closing valve for a gas appliance according to item 1. (3) When the second valve element contacts the second valve seat, the second valve element also contacts the gas pipe wall, and there is a gap between the second valve element and the gas pipe wall. The gas line opening/closing valve for a gas appliance according to claim 2, wherein the gas line is sealed even when the gas line is sealed.