JPS5833392Y2 - Slow ignition device for gas water heater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a slow ignition device for a gas water heater, and is particularly aimed at reducing the number of replacement parts associated with the calorie conversion of fuel gas.

The slow ignition device for this type of gas water heater has a diaphragm that is deformed by the flow of water in the water passage, and this deformation is used to open and close the gas valve installed in the gas passage. Some gas valves are composed of individual gas valves and open and close small-diameter gas holes formed in sub-gas valves.

In this device, it is necessary to change the diameter of the gas vent as the gas calorie changes, and for this reason, smooth slow ignition cannot be performed unless the main gas valve or the main and sub gas valves are replaced.
Many replacement parts were required.

The present invention has been devised in view of the above points, and embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a valve section of a stop-start gas water heater, which is composed of a water valve section 2 and a gas valve section 3.

Here, the water valve part 2 includes a water supply channel 4, a water pressure adjustment chamber 5, a water pressure adjustment port 6, a diaphragm chamber 7, a water volume adjustment hole 8, and a venturi 9.
A diaphragm 12 is stretched over the diaphragm chamber 7 to partition a low pressure chamber 13, and this low pressure chamber 13 is connected to a venturi through a communication path 14. 9, and the water pressure adjustment chamber 5 is connected to the diaphragm 12 through the water pressure adjustment port 6 at one end.
The water pressure adjustment valve 16 that is in contact with the water pressure adjustment valve 16 is housed, and the water volume adjustment hole 8
An externally operated water flow control valve 17 for adjusting the degree of opening of the water flow control valve 17 is provided.

On the other hand, the gas valve part 3 has a gas inlet passage 18 connected to a gas source at one end.
and a gas outlet passage 1 connected to a gas burner etc. at the other end.
9, and a gas passage 21 having a valve port 20 formed in the middle;
The gas passage 21 includes a slow ignition device 22 housed opposite the valve port 20 in the gas passage 21.

Here, the slow ignition device 22 can be freely inserted into and removed from a main gas valve 27 having a U-shaped cross section, which is biased by a spring 23 in a direction to always close the valve port 20, and into a recess 25 of the main gas valve. and the auxiliary gas valve 3 which is always biased in the insertion direction by a spring 29.
It consists of 2.

The main gas valve 27 has a through hole 24 formed at the center of the central side, a gas passage hole 26 around the through hole 24, and a gas passage hole 26 formed around the side side facing the valve seat 33 of the valve port 20. A valve seat 35 is provided protruding from the valve seat 35, and another valve seat 34 is provided on the side and the top.
is installed protrudingly.

The auxiliary gas valve 32 has a protruding shaft 28 that movably passes through the through hole 24, and this protruding shaft 28 is fixed to the spindle 30 so as to abut against the low pressure chamber 13 side of the diaphragm 12. A gasket 36 that faces the valve seat 34 is protruded from the side, and an inwardly tapered valve portion 31 is formed on the circumferential surface of the valve for insertion into and removal from the recess 25 for changing the degree of opening of the recess. An annular stopper 37 that locks the center side of the main gas valve 27 is attached to the rear end of the protruding shaft 28 passing through the through hole.

Next, the operation of the slow ignition device for a gas water heater according to the present invention will be explained.

First, when water is flowing into the water passage 11, the gas valve part 3 is located at a position shown below the center line in FIG. 2, and the main gas valve 27
The auxiliary gas valves 32 are biased by springs 23 and 29, respectively, to bring the gaskets 35 and 36 into close contact with the valve seats 33 and 34, thereby closing the valve port 20 and the gas passage hole 26.

Next, water flows through the water passage 11 through the water supply passage 4 - the water pressure adjustment chamber 5 - the water pressure adjustment port 6 - the diaphragm chamber 7 - the water volume adjustment hole 8 - the venturi 9 = the outlet passage 10.

At this time, due to the differential pressure generated in the venturi 9, the diaphragm 12 is deformed toward the low pressure chamber 13, causing the spindle 30 to slide in its axial direction.

Then, by moving the spindle 30 by a certain amount, the auxiliary gas valve 32
moves and separates from the main gas valve 27, so that the gap 38 created between the valve part 31 and the wall of the recess 25 of the main gas valve 27 gradually becomes larger, and the gas flows through this gap 38 from the gas inflow path 18. It passes through the hole 26 and reaches the gas outlet path 19 (see above the center line in FIG. 2).

Therefore, the amount of gas is gradually increased and ignition is performed slowly at the time of ignition.

When the spindle 30 slides further, the gap 3
8 has an opening degree greater than the opening amount of the gas vent 26, and
The first hesper 37 is in contact with the main gas valve 27 and the main gas valve 2
Start opening 7.

(See Figure 3) As described above, the amount of gas flowing into the gas outlet path 10 immediately after the start of water flow into the water flow path 11 is a characteristic diagram of the secondary gas pressure (gas pressure downstream of the slow ignition device 22). As shown in FIG. 4, the number of steps is increased to approximately three stages.

As described above, the slow ignition device for a gas water heater according to the present invention includes a spindle that is moved when water is passed through the water passage, and a main and sub gas valve that opens and closes the gas passage in conjunction with this spindle. In a case where a gas vent provided in the main gas valve for slow ignition is opened by a sub gas valve at the beginning of movement, the amount of gas passing through the gas vent is changed to the sub gas valve as the sub gas valve is opened. It is characterized by having a valve part that gradually increases the gas flow rate, and at the initial stage of operation of the auxiliary gas valve, immediately after water flows into the water passage,
Slow ignition is possible by gradually increasing the amount of gas passing through the gas hole using the valve part provided in the auxiliary gas valve, and the amount of gas supplied to the gas burner etc. immediately after opening the auxiliary gas valve can be reduced unlike conventional methods. It is no longer necessary to set the diameter of the gas passage hole, and therefore there is no need to replace the main gas valve etc. when changing the gas type, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a slow ignition device for a gas water heater according to the present invention, FIGS. 2 and 3 are enlarged sectional views of essential parts for explaining the operation, and FIG. 4 is a characteristic diagram. 11... Conduit, 20... Valve port, 21
...Gas passage, 23゜29...Spring, 26...Gas vent, 27...Main gas valve, 30...Spindle , 31...
・Valve part, 32...Sub-gas valve, 38...
gap.

Claims (1)

[Scope of utility model registration request] A main gas valve and an auxiliary gas valve that are operated by a spindle that is moved when water is flowing, a gas vent for slow ignition is provided in the main gas valve, and the auxiliary gas valve is opened at the beginning of the movement of the spindle. A slow ignition device for a gas water heater, characterized in that the auxiliary gas valve is provided with a valve portion that gradually increases the amount of gas passing through the gas hole when the gas valve is moved to open.