JPH025241Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a gas type switching device for a gas valve used in various gas combustion appliances such as instantaneous gas water heaters.

[Conventional technology]

When converting from low-calorie 6B gas, 6C gas, etc. to high-calorie LPG, 13A gas, etc., in conventional gas combustion appliances, the gas valve body and its valve seat are set for a single gas type. ing.

[The problem that the idea aims to solve]

In conventional gas combustion appliances, it was necessary to replace the valve seat with one for the converted gas type. Therefore, when the type of gas such as city gas is changed, there is a drawback that the conversion work requires a lot of time and money.

This invention is a gas valve that eliminates the above-mentioned drawbacks of the conventional gas valve by making it possible to adapt the gas passage opening area to the gas type by simply changing the positional relationship of the valve seat body for gas type conversion with respect to the seat surface of the valve body. The present invention provides a gas type switching device.

[Means to solve the problem]

In order to achieve the above purpose, the structure of this invention is as follows:
A valve seat body 5 for gas type conversion is installed on the tapered valve surface 4 of the valve body 3 which is installed in the gas supply path 2 to the main burner 1 to control the increase/decrease of the amount of gas supplied, in an arbitrary direction coaxially with the valve body 3. This is a gas type switching device for a gas valve, which is movably arranged opposite to each other with an operating means A, and is capable of switching the gap between a valve body 3 and a valve seat body 5 to be wide or narrow.

[Effect]

According to this gas type switching device, the valve seat body 5 for gas type switching is moved up and down according to the gas type, and the gap between the valve face 4 of the valve body 3 and the valve seat body 5 is changed to a wide or narrow one. The opening area shall be suitable.

〔Example〕

Below, one embodiment of the gas type switching device for a gas valve according to this invention will be explained in detail based on the drawings. Fig. 1 shows the case where the gas type switching device of this invention is applied to a gas water heater, and Fig. 2 shows a case where the gas type switching device of this invention is applied to a gas water heater. 3 shows the operating state of its main parts, 1 is a main burner, 2 is a gas supply path to the main burner 1, which is integrally formed in the valve housing B. 3 is a valve body installed in the valve chamber 2a provided in the middle of the gas supply path 2 to control the increase/decrease of the amount of supplied gas;
The main burner The amount of gas supplied to heat exchanger C is automatically controlled in proportion to the amount of water supplied to heat exchanger C. Reference numeral 4 denotes a valve surface provided on the valve body 3, and a truncated cone body 4a is integrally provided at the lower part of the valve body 3 to form a tapered valve surface 4. Reference numeral 5 denotes a cylindrical valve seat body for gas type conversion having a seat surface 5a at the tip, which is connected to the cylindrical support part 1 of the valve housing B.
0, it can freely slide up and down, but its rotation is restricted.The distal end seat surface 5a is opposed to the tapered valve surface 4 so that the gap is wide and narrow. A moves the valve seat body 5 for gas type conversion up and down, and the tip seat surface 5a is attached to the valve body 3.
This is an operating means for performing a gas type conversion operation by selectively switching to the valve surface 4 of the valve.
A screw tube 12 having a shape is fitted so as to rotate freely, and the screw tube 1
2, screw the base end female threaded portion 5b of the valve seat body 5 for gas type conversion into the screw tube 1 with the operation dial portion 12a.
2, the gas type conversion valve seat body 5 is moved up and down, and the gap between the valve surface 4 of the valve body 3 and the tip seat surface 5a of the gas type conversion valve seat body 5 is widened or narrowed. I'm starting to be able to do it. In addition, if stoppers are provided at each of the upper and lower limit positions of the gas type conversion valve seat body 5, the operation will be made easier. 13 is a retaining ring for preventing the screw tube 12 from coming off. The operating means A is not limited to that of the embodiment, and may have any other arbitrary structure in terms of implementation. In the figure, reference numeral 14 indicates a gas hole drilled below the valve seat body 5 for gas type conversion, 15 indicates a valve seat of the valve body 3, 16 indicates a spring that urges the valve body 3 in the closing direction, and 17 indicates gas introduction. 18 is a water inlet pipe, 19 is a water governor valve, 20 is a water supply pipe to heat exchanger C, 21 is a hot water outlet pipe from heat exchanger C, 22 is a bench lily part provided in water supply channel 6, 7 secondary chamber 7b and communication pipe 23
communicated via.

In the above configuration, for example, for high calorie gas such as 13A gas, the gas inlet pipe 1
7 from the valve housing B, rotate the screw tube 12 with the operation dial part 12a, and move the valve seat body 5 for gas type conversion to a predetermined position, that is, with its tip seat surface 5a aligned with the valve seat of the valve body 3. H ₁ from 15
When the valve body 3 is raised to the position shown in _FIG . A predetermined amount of gas is supplied to the main burner 1 (see Figure 2).
In addition, for low-calorie gases such as 6C gas, the operation dial part 12a rotates the threaded tube 12 to a predetermined position, that is, the tip of the gas type conversion valve seat body 5. When the seat surface 5a is lowered from the valve seat 15 of the valve body 3 until it reaches the position _H2 , the valve surface 4 of the valve body 3 and the tip seat surface 5 of the valve seat body 5 for gas type conversion
The gap _A2 between the inner end of the hole A2 and the inner end of the hole A2 has an opening area suitable for the above-mentioned gas type, and a predetermined amount of gas is supplied to the main burner 1 (see FIG. 3).

[Effect of idea]

As explained above, when changing gas types, this device simply moves the valve seat body for gas type conversion forward and backward using any operating means and changes the gap between the seat surface and the valve surface of the valve body to widen or narrow. Since it can be adapted to the conversion gas type, there is an advantage that the gas type conversion work can be easily and reliably performed without requiring replacement of parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment in which the gas type switching device according to this invention is applied to a gas water heater, and FIGS. 2 and 3 are sectional views of the main parts when changing the gas type. 1... Main burner, 2... Gas supply path, 3...
... Valve body, 4... Valve surface, 5... Valve seat body for gas type conversion, 5a... Seat surface, A... Operation means.

Claims (1)

[Scope of utility model registration request] A valve seat body 5 for gas type conversion is installed on the tapered valve surface 4 of the valve body 3 which is installed in the gas supply path 2 to the main burner 1 to control the increase/decrease of the amount of gas supplied, in an arbitrary direction coaxially with the valve body 3. A gas type switching device for a gas valve, characterized in that the operating means A are movably disposed opposite each other, and the gap between the valve surface 4 and the valve seat body 5 can be changed widely.