JPH025242Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] 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.

[Problems to be solved by the invention] 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 combines one valve seat with a normally open gap and a bypass hole that can be opened and closed to easily adapt the gas passage opening area to the type of gas, thereby solving the above-mentioned drawbacks of the conventional method. The present invention provides a gas type switching device for a gas valve.

[Means to solve the problem]

In order to achieve the above purpose, the structure of this invention is as follows.
A normally open gap _t1 having a constant opening area is provided between the valve face 4 of the valve body 3, which is installed in the gas supply path 2 to the main burner 1 and controls the amount of supplied gas, and the valve seat 5. On the inside of the sheet 11 of the body 3, there is a gap _t2 with a constant opening area outside the normally open gap _t1 .
A sleeve 12 having a valve 12a for opening and closing the bypass hole 6 is placed below the valve seat 5 at an upper or lower limit position. This is a gas type switching device for a gas valve in which the bypass hole 6 can be opened and closed so that the bypass hole 6 can be switched.

[Effect]

According to this gas type switching device, the sleeve is switched to the upper limit or lower limit position depending on the gas type, and the bypass hole is opened and closed by a valve on the upper part of the sleeve to change the opening area.

〔Example〕

Below, an example of the gas type switching device for a gas valve according to this invention will be explained in detail based on the drawings.
Figure 1 shows the case where the gas type switching device of this invention is applied to a gas water heater, and Figures 2 to 5 show its main parts, where 1 is the main burner, 2 is the main burner, and 2 is the main burner. A gas supply path to the main burner 1, which is integrally formed with the valve housing B. Reference numeral 3 denotes a valve body installed in a valve chamber 2a provided in the middle of the gas supply path 2 to control the increase/decrease of the amount of supplied gas, and a diaphragm chamber 8 with a primary chamber 8a facing the water supply channel 7 to the heat exchanger C. The amount of gas supplied to the main burner 1 is connected to the amount of water supplied to the heat exchanger C by controlling the opening degree in response to the water supply pressure. It is now automatically controlled proportionally. Reference numeral 4 denotes a valve surface provided on the valve body 3, in which a truncated cone body 4a is integrally provided at the lower part of the valve body 3, and a tapered valve surface 4 is formed on the outer peripheral surface of the truncated cone body 4a. Reference numeral 5 denotes a valve seat corresponding to the tapered valve surface 4 of the valve body 3 provided inside the seat 11 of the valve body 3, and a predetermined valve seat 5 is provided between the valve seat 5 and the valve surface 4 of the valve body 3. A normally open gap t ₁ having a constant opening area is formed. Reference numeral 6 denotes a bypass hole having a gap t ₂ of a predetermined opening area in addition to the above-mentioned normally open gap t ₁ , which is bored parallel to the outside of the normally open gap t ₁ and whose lower part is below the valve seat 5 . An opening 6a is formed in the portion.
A is an opening/closing means for opening/closing the bypass hole 6;
The embodiment shown in FIGS. 1 to 4 has a short cylindrical valve 12a at the upper end that opens and closes the lower opening 6a of the bypass hole 6 by bringing it into contact with and separating from the lower surface of the valve seat 5. is the gas flow window hole 12
The sleeve 12 with the hole b is attached to the cylindrical support part 1 of the valve housing B.
A fixed cylinder shaft 14 is inserted into the sleeve 12 so as to be able to freely slide up and down, and has a plurality of locking protrusions 12c provided at the lower end of the sleeve 12 erected integrally with the valve housing B.
The sleeve 12 can be engaged with a series of horizontal locking grooves 14a provided on the upper part of the sleeve 14a and a plurality of vertical grooves 14b communicating with the horizontal locking grooves 14a, and the sleeve 12 is pressed upward by springs 15. The locking protrusion 12c is engaged with the vertical groove 14b and the sleeve 12 is at the upper limit position, and the operating handle 16 provided on one side of the lower end rotates the sleeve 12 down against the spring 15 to rotate the locking protrusion 12c. The sleeve 12 is moved to the lower limit position by being locked in the locking lateral groove 14a, the upper end valve 12a is separated from the valve seat 5, the bypass hole 6 is opened, and the sleeve 12 in the lower limit position is moved by the operating handle 16. By rotating the locking convex piece 12c to match the vertical groove 14b, the sleeve 12
presses the upper end valve 12a, which has been raised by the elastic force of the spring 15, against the valve seat 5, thereby opening the bypass hole 6.
It is becoming more and more obstructed. 17 is sleeve 1
This is a spring receiver provided at the lower end of 2.

In addition, in the embodiment shown in FIG. 5, a bypass hole 6 is bored in the valve seat 5, and a plate-shaped valve 12a provided at the upper end of the sleeve 12 is provided in the lower part of the valve seat 5. As in the embodiment, by moving the sleeve 12 up and down, the plate valve 1
2a comes into contact with and separates from the lower surface of the valve seat 5 so that the bypass hole 6 can be opened and closed. The other structures are the same as those in the previous embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

The opening/closing means A is not limited to that of the embodiment,
Other arbitrary structures may be used as desired in terms of implementation.
In the figure, 18 is a spring that biases the valve body 3 in the closing direction, 19 is a gas introduction pipe, 20 is a water introduction pipe, 2
1 is a water governor valve, 22 is a water supply pipe to heat exchanger C,
23 is the outlet pipe from the heat exchanger C, 24 is the water supply channel 7
It communicates with the secondary chamber 8b of the diaphragm 8 via a communication pipe 25 at a bench lily portion provided in the diaphragm 8 .

In the above configuration, for example, for high calorie gas such as 13A gas, the gas inlet pipe 1
9 from the valve housing B, rotate the sleeve 12 using the operating handle 16, and align the locking protrusion 12c with the vertical groove 1.
4b, the sleeve 12 is at the lower limit position.
rises due to the elastic force of the spring 15, and its upper end valve 12a comes into pressure contact with the valve seat 5, thereby closing the bypass hole 6 and reducing the amount of gas supplied to the main burner 1 between the valve face 4 of the valve body 3 and the valve seat. It is controlled only by the normally open gap t ₁ between the gas and the gases 5 to adapt to the above gas type (see FIG. 3). Also,
For low-calorie gases such as 6C gas, remove the gas inlet pipe 19 from the valve casing B, and use the operating handle 16 to pull the sleeve 12 from the upper limit position to the lower limit position against the spring 15, either to the left or right. When the locking convex piece 12c is turned slightly to the locking horizontal groove 14a, the upper end valve 12a is separated from the valve seat 5, opens the bypass hole 6, and reduces the amount of gas supplied to the main burner 1. It is controlled by the sum of the normally open gap t ₁ between the valve surface 4 of the body 3 and the valve seat 5 and the gap t ₂ of the bypass hole 6 to adapt it to the above gas type (Figs. 1 and 2). figure,
(See Figure 5).

[Effect of idea]

As explained above, this idea allows the amount of gas supplied to the main burner to be distributed between the normally open gap between the valve surface of the valve body and the valve seat by simply moving the sleeve up and down to open and close the bypass passage when changing the gas type. Alternatively, the normally open gap and the gap in the bypass passage can be switched to match the gas type, so there is an advantage that the gas type conversion operation 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, Figs. 2 and 3 are sectional views of the main parts when changing the gas type, and Fig. 4 is a perspective view. , FIG. 5 is a sectional view of a main part of a different embodiment. 1... Main burner, 2... Gas supply path, 3...
... Valve body, 4 ... Valve surface, 5 ... Valve seat, t ₁ ... Normally open gap, t ₂ ... Gap, 6 ... Bypass passage, A ... Opening/closing means, 12 ... Sleeve, 1
2a... Valve, 14... Fixed cylinder shaft.

Claims (1)

[Scope of utility model registration request] A valve surface 4 of a valve body 3 that is installed in the gas supply path 2 to the main burner 1 and controls the amount of supplied gas.
A normally open gap t ₁ with a constant opening area is provided between the valve body 3 and the valve seat 5, and a gap with a constant opening area is provided outside the normally open gap t ₁ inside the seat 11 of the valve body 3.
A sleeve ₁₂ having a valve 12a for opening and closing the bypass hole 6 is placed below the valve seat 5 at an upper or lower limit. A gas type switching device for a gas valve, characterized in that a bypass hole 6 can be opened and closed so that the position can be changed.