JPH0241470Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a safety valve mounting device for a gas tank, particularly for an automatic ignition gas tank equipped with a thermoelectric safety valve.

(Prior art and problems) In automatic ignition gas tanks equipped with a thermoelectric safety valve, when the press rod is pushed in conjunction with the rotation or push-and-turn operation of the operating shaft, the safety valve is pushed open and the pilot gas is released. This type of safety valve is designed to be installed as a single unit by fitting it from the end opening of the main body and tightening it with a screw. 70574
issue).

A known safety valve mounting device, as shown in FIG. 3, attaches a separate iron flange 51 to a safety valve body 50, and connects this flange with a mounting flange 61 on the side of the Kotuku body 60 and tightens them with screws 62. be. At this time, iron flanges were subjected to surface treatments such as plating to prevent rust, which caused problems in terms of conductivity. In addition, when flanges are brought into close contact with each other on their flat surfaces, the entire surface is not brought into close contact due to foreign objects getting caught in the flat parts or dents, etc. This causes an increase in the electrical resistance value, causing an abnormality in the suction of the safety valve, resulting in safety issues. There was a problem that there was a lack of

(Technical Issue) Therefore, in this invention, we have developed a technology to ensure that the safety valve and the safety valve can be reliably installed and have good electrical contact even if the flanges are not brought into close contact with each other over their entire surfaces. This will be a major issue.

(Means for solving the problem) In order to solve the above technical problem, the present invention
Equipped with a mechanism that opens and closes the pilot gas outlet and main gas outlet by operating the operating shaft, and a thermoelectric safety valve that opens the valve with a pressure rod that is linked to this operation and maintains the valve in the open state using thermoelectromotive force. In the gas kettle, the safety valve mounting part of the kettle body is provided with a safety valve mounting flange corresponding to the flange on the safety valve side and an annular step facing the inner surface of the end mouth, and the tip is pressed against the annular step so as to be crushed by pressure tightening. A small sharp protrusion is integrally formed around the entire circumference, and the front end surface of the fitting portion of the safety valve main body is press-fitted to the annular stepped portion.

(Function) Valve body 1 is attached to the rear end of Kotoku body 1 and safety valve mounting part 2.
When the safety valve main body 10 is inserted so that 1 is on the inside and the fitting part 12 is fitted to the annular step 3 of the end opening 2a, the fitting part 12 fits into the small protrusion 4 formed on the annular step 3.
The front end surface 12a of the two abuts against each other. Through this fitting, the mounting flanges 5 and 13 of both bodies come face to face in a palm-to-face manner, but since the length of the fitting part 12 is set larger than the depth of the stepped part, there is a gap S between the two flanges. and are separated from each other.

In this state, tighten both flanges 5 and 13 with the tightening screw 2.
When fastened so that the gap S becomes small at 0, the small protrusion 4 is pressed by the front end surface 12a of the fitting part, so the peak of the small protrusion with the pointed tip is crushed and the front end surface 12a is pressed.
It is transformed into a plane corresponding to a. Therefore, good electrical contact is made between the safety valve body 10 of the Kotsuk body 1 and the pressed small protrusion 4 and the front end surface 12a of the fitting portion.

In addition, the pressure deformation of the small protrusion 4 applies lateral pressure to the ring packing (O-ring) 14 fitted under the neck of the fitting portion of the safety valve body on the inside thereof, thereby improving sealing performance.

(effect) The present invention has the following unique effects.

Even if the mounting flange on the safety valve body side is made of iron and has been subjected to surface treatment such as anti-rust, resulting in poor conductivity, the fitting part is pressed by tightening both flanges, crushing the small protrusion of the annular step, and preventing the corresponding surface from forming. Since it is crimped so that it conforms to the surface, it is possible to improve the fitting accuracy, improve electrical contact, and improve the suction performance of the safety valve.

Seal performance can be improved by applying lateral pressure to the ring gasket fitted under the neck of the fitting portion of the safety valve body by compressing the small protrusion.

This reduces the chance of foreign matter getting caught between the flanges on the Kotsuk body side and the safety valve side, or the occurrence of dents, etc., making it possible to perform strong and reliable flange fastening.

The structure is simple and can be implemented at low cost.

(Example) A preferred embodiment of the invention is shown below.

Figure 1 shows the case where the present invention is applied to a push-and-turn type gas tank equipped with an internal closure.

In the same figure, a pilot gas outlet 21 is provided on the main body 1 of the cockpit by rotating an operating shaft 6 and the operating shaft.
A closure 7 that rotates to open and close the main gas outlet 22 and a safety valve body 10 that maintains the valve port 8 in an open state by thermoelectromotive force are provided.

The closure 7 has a pilot valve 23 and a pressing rod 24 installed therein, which open when pushed by the operating shaft 6 and simultaneously push open the valve body 11 of the safety valve.

The safety valve has a hollow cylindrical main body 10 and an electromagnet 10a inside the main body 10 and a suction plate 10b facing the end face of the electromagnet.The suction plate 10b and the valve body 11
and are integrally connected via a rod 10c.

When the operating shaft 6 is pushed and turned, the pin, cam, connecting plate, and closure 7 rotate, and the igniter (not shown) is activated.

Also, the valve body 11 of the safety valve and the pilot valve 23 are pushed open via the pressing rod 24. Therefore, gas inlet 2
8 flows sequentially from the valve port 8 of the safety valve, through the pilot valve 23 in the closure 7, from the pilot gas outlet 21 and the main stream outlet 22, ignites the pilot burner, and then ignites the main burner.

The thermocouple 15 led out from the safety valve is placed facing the pilot burner, and when it is heated at the same time as ignition, a thermoelectromotive force is generated and the adsorption plate 10b is adsorbed to the electromagnet 10a, so it is first forced to be pushed by the pressing rod 24. The opened valve body 11 is maintained open. Therefore, even if the pressure on the press rod 24 is released, the valve remains open.

The safety valve main body 10 has a main body body 10d and a fitting part 12.
The head 10e is made of a conductive metal such as brass, and the flange 5, which serves as a mounting part, is made of a separate iron plate and is joined to the main body 10 by caulking, welding, or the like.

The ring packing 14 has a fitting portion 12 that has a larger diameter than the body portion 10d at the outer circumference of the body portion 10d.
The outer diameter of the gasket 14 is made to fit into the annular groove 10g between the inner wall 2b of the cylindrical portion of the main body 1 and the inner diameter of the inner wall 2b of the cylindrical portion of the main body 1. .

The small protrusion 4 of the step part 3 is formed in an annular shape, and the top part contacts the front surface 12a of the fitting part with the entire circumference, and when the top part is pressed by tightening the screw 20, it is crushed and deformed and crushed into a flat shape. What used to be a line contact becomes a surface contact. The thermocouple 15 has one electric wire 15a connected to the safety valve main body 10 and the other electric wire 15b connected to the main body 1, respectively, to electrically connect the coil of the safety valve electromagnet 10a.

Although the present invention is applied to a push-and-turn type closed-piece internal type gas tank, it can also be applied to a gas control valve or the like that does not have a closed-piece.

[Brief explanation of drawings]

FIG. 1 is a vertical side view of a gas tank according to the present invention, FIG. 2 is an enlarged sectional view of the main parts of the invention, and FIG. 3 is a sectional view of the main parts of the conventional example. 1... Kotoku body, 2... Safety valve mounting part, 3...
...Stepped portion, 4...Small protrusion, 10...Safety valve body, 1
DESCRIPTION OF SYMBOLS 1... Valve body, 12... Fitting part, 5, 13... Flange, 14... Ring packing, 20... Screw.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A mechanism that opens and closes the pilot gas outlet and the main gas outlet by operating the operating shaft, and a valve that is opened by a pressure rod linked to this operation and opened by thermoelectromotive force. In a gas tank equipped with a thermoelectric safety valve that is held at A safety valve in a gas tank, characterized in that a small protrusion with a pointed tip is integrally formed around the entire circumference so as to be crushed by a pressing force, and the front end surface of the fitting part of the safety valve body is crimped to the annular stepped part. Mounting device. (2) The safety valve mounting device for a gas tank according to claim 1, wherein the small protrusion of the annular stepped portion is integrally formed with the main body of the tank by die-casting aluminum.