JPS5911325Y2 - Slow ignition valve and water drain device for instantaneous gas water heaters - Google Patents

Description

[Detailed description of the invention] This invention relates to a slow ignition valve and drain device for an instantaneous gas water heater.

In instantaneous gas water heaters that use the movement of a diaphragm caused by flowing water pressure to open and close the gas valve to supply and disconnect gas to the main burner, conventional slow ignition valves and water drain valves have been installed separately. .

In other words, as shown in Figure 3, the low pressure side (secondary side) of the diaphragm chamber and the water supply are connected in order to prevent an explosion and ignition caused by the sudden opening of the gas valve due to excessive water pressure immediately after the water supply faucet or hot water tap is opened. In order to prevent water remaining in the diaphragm chamber from freezing and damaging the appliance after using the water heater, a device is installed to throttle the communication path with the venturi section installed in the water heater, that is, a slow ignition valve V'. However, since these are installed separately, the structure is not only complicated, but also requires a lot of effort to assemble, and the number of parts increases. There were drawbacks such as increased cost.

This invention eliminates the various drawbacks of the conventional valve by using a special valve that integrates a slow ignition valve and a water drain valve. In the type gas valve device, a slow ignition valve is provided in the upper part, which can restrict the flow passage when the valve body is seated, and water stop valves V1, V2, and V3 are provided in the lower part, and a venturi part of the water supply passage is provided on the outer periphery of the valve. A water drain plug is installed in the diaphragm chamber, and includes a first groove that communicates with the communication hole and the water passage, a second groove that communicates with the high pressure side of the diaphragm chamber, and a third groove that communicates with the water drain passage that drains to the outside. The valves are screwed into the low pressure side of the valve seat to maintain watertight contact with each valve seat, and the drain valves are loosened to allow water to drain from the high and low pressure sides to provide slow ignition and drain residual water. To provide a slow ignition valve and water drain device for instantaneous gas water heaters.

This invention will be explained below based on embodiments shown in the drawings.

In FIGS. 1 and 2, 1 is a diaphragm operated by water supply pressure, and is connected via a connecting shaft 12 to a gas valve 2 installed in a gas passage C leading to the main burner B. are now working together.

A diaphragm chamber 3 is divided by the diaphragm 1 into a high pressure side (primary side) 3b and a low pressure side (secondary side) 3a.

Reference numeral E denotes a multi-stage valve type water drain plug body, which is screwed into the low pressure side 3a of the diaphragm chamber 3, and when the ball valve 4 is seated on the tip thereof, only the water passage 13 is opened and the water flow passage 5 is opened.
A slow ignition valve (2) is provided with a structure that restricts the ignition, and is located at the lowest part of the low pressure side 3a of the diaphragm chamber.

In this case, the ball valve 4 is desirably made of a material with a specific gravity of 1 or less.

At the bottom of the slow ignition valve V, there is a water stop valve Vl of a different diameter,
V2 and ■3 are provided in a multi-stage manner with appropriate intervals, and annular grooves 6 and 7.8 are bored in the lower part of each of these valves V1, V2, and V3, respectively, and the first groove 6 at the top is bored. It communicates with the water passage 5 of the slow ignition valve (■) through a communication hole 14, and also communicates with the venturi portion 10 provided in the middle of the water supply waterway 9 through a communication hole 15, and the second groove 7 in the middle is connected to the diaphragm. It communicates with the lowest part of the high-pressure side 3b of the chamber 3 via a communication hole 16, and furthermore, the third groove 8 at the bottom communicates with the outside of the vessel via a drain passage 11 bored in the stopper E. .

Therefore, when the stopper E is tightened and closed, the multistage valve V1
, ■2, Multi-stage valve V., in order to keep water from each other through the packings provided on the valve seats 17, 17', 17'' of V3.
V2 and V3 are arranged so as to come into close contact with their respective valve seats 17, 17', 17'' at the same time.

In addition, in the figure, 18 is the heat collector of the water heater, 19 is the water tap, and 20
is the hot water tap.

Since this device is constructed as described above, the venturi portion 10 of the water supply channel 9 and the slow ignition valve (2) having the ball 4 are communicated with each other through the communication holes 14, 15 and the water flow channel 5. When excessive water pressure is applied to the diaphragm 1 immediately after the water supply faucet 19 or hot water tap 20 is opened, the ball valve 4 is seated by the action of the venturi portion 10, and the water passage 5 is narrowed so that only the throttle passage 13 is closed. Since it communicates with the venturi section 10, the movement of the diaphragm 1 to the left in the drawing is restricted and the gas valve 2 is not suddenly opened, preventing explosive ignition and the like, and allowing proper slow ignition. .

Also, when draining water to prevent freezing, when the stopper E is loosened, the multistage valves Vl, V2, and V3 simultaneously move away from the valve seats 17, 17', and 17'' and open, so that the high pressure side 3b of the diaphragm chamber 3 is removed. The remaining water flows down from the communication hole 16 through the second groove 7 and the gap between the valve 3 and the valve seat 17'', and is discharged from the third groove 8 to the outside of the vessel via the drain passage 11. Residual water on the low pressure side 3a is removed from each valve Vl, V
The water flows down through the gaps between the valve seats 17, 17', and 17'' and is discharged from the third groove 8 through the drainage passage 11 to the outside of the vessel.

As explained above, this idea organically incorporates the slow ignition valve and the water drain valve into one, making it compact and easy to process and assemble.It also reduces the number of parts and costs. In addition, residual water on the high and low pressure sides of the diaphragm chamber can be drained at the same time by simply loosening the plug, and slow ignition is also performed accurately. It has the advantage of being safe to use.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic front view showing an embodiment of this invention;
FIG. 2 is an enlarged sectional view of only the main parts, and FIG. 3 is a schematic diagram of the main parts showing a conventional one. 1...Diaphragm, 2...Gas valve,
3...Diaphragm chamber, E...Multi-stage valve type drain plug, 4...Valve, 5...
Water passage, ■... Slow ignition valve, V. ,V2,V
3... Water stop valve, 6, 7.8... Annular groove, 9... Water supply channel, 10... Venturi portion, 11... ...Water drainage passage.

Claims (1)

[Scope of utility model registration request] In a water pressure responsive gas valve device that opens and closes a gas valve by operating a diaphragm using water supply pressure, a slow ignition valve that can throttle the passageway when the valve body is seated is provided in the upper part, and water stop valves V1 and V2 are provided in the lower part. , V3, and on the outer periphery of the water stop valve are a first groove that communicates with the communication hole of the venturi portion of the water supply channel and the water passage, a second groove that communicates with the high pressure side of the diaphragm chamber, and discharge to the outside. A drain plug equipped with a third groove communicating with the drain passageway is screwed into the low pressure side of the diaphragm chamber, and each valve is brought into close contact with each valve seat in a watertight manner,
A slow ignition valve and water draining device for an instantaneous gas water heater that allows water to be drained from the high and low pressure side by loosening the drain valve.