JPS5815699B2 - Water heater safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for a gas instantaneous water heater, etc., and is aimed at ensuring safety in the event of an unexpected accident.

Generally, a gas instantaneous water heater has an outlet 1 as shown in Figure 1.
When 01 is opened, the water pressure responsive gas valve 102 is opened and the main burner 103 burns, and when the outlet 101 is closed, the water pressure responsive gas valve 102 is closed and the main burner 103 is extinguished.

However, if the fire in the main burner 103 is not extinguished or is delayed for some reason, the heat exchanger 10
The internal pressure of 4 may rise abnormally and cause damage.

For this reason, a safety valve 106 is provided in the outlet passage 105 from the heat exchanger 104, and the safety valve 106 releases abnormal pressure to prevent damage.

However, even if the abnormal pressure is released by the safety valve 106, the main burner 103 continues to burn, which is very dangerous.

The present invention solves these conventional drawbacks, and utilizes the steam pressure from the safety valve to shut off the gas.

One embodiment of the present invention will be described below using a push-turn cock with an electromagnetic safety device.

In the figure, 1 indicates a gas inflow chamber 2 and this gas inflow chamber 2.
This is a valve housing in which a main gas passage 3, a pilot gas passage 4, and a pilot gas passage 5 are formed in communication with each other, and a pair of support columns 6 are provided downwardly from both sides of the lower surface of the valve housing.

7 is a main valve for opening and closing the main gas passage 3; 8 is a pilot valve for opening and closing the pilot gas passage 4; Also spring 1
1.12, and is normally energized so as to come into contact with the respective valve seats 13 and 14.

15 is a normally closed pilot valve interposed in the middle of the pilot gas passage 5; 16 is its valve lever; 17 is a cover plate 18 provided at the lower end of the support column 6; and a shaft hole 19 formed in the lower surface of the valve housing 1. The operating shaft 20 is slidably and rotatably supported on the operating shaft 17, and 20 is a switch that is attached to the operating shaft 17 so as to be non-rotatable and slidable in the axial direction.

The switch 20 has a cylindrical shape as a whole, and has annular grooves 23 on its lower surface around a cylindrical protrusion 22, which are repeated around the outer periphery, and a step on its upper surface in the direction of rotation. It has an inclined groove 24 and a surface portion 25 that is flush with the rotation direction.

The cylindrical protrusion 22 has an operating shaft 170 and a stepped portion 1.
7' is fitted so that it cannot rotate but can move up and down.

27 is a spring that urges the switch 20 downward;
8 is a spring of the operating shaft 17.

29 is a cam fixed below the operating shaft 1T.

Reference numeral 30 denotes a holding member which is slidably supported by the support column 6 and has a long hole 31 formed in the center thereof through which the operating shaft 17 passes, and is brought into contact with the cam 29 by pressing the operating shaft 17. A contacting rib 32 is provided.

A pair of left and right pin-shaped holders 33 are provided on the opposite side.

Reference numeral 34 denotes an electromagnetic safety device attached to the outside of one of the pillars 6 via a mounting plate, etc., and is configured using a thermocouple 35 as a power source, which is heated by the combustion heat of the pilot fire bar and generates a thermoelectromotive force.

Reference numeral 36 denotes an operating rod protruding from the electromagnetic safety device 34, which is normally energized by a spring 37 so that a suction plate (not shown) is separated from an electromagnet (not shown).

39 is a knob attached to the tip of the operating shaft 17.

40 is a heat exchanger heated by the main burner 38;
A hydraulic response device 41 detects the water flow and opens and closes the hydraulic response gas valve 42, which controls the gas flowing from the gas inflow chamber 2 to the main gas passage 3 via the main valve 7.

Reference numeral 44 denotes a hot water outlet passage led out from the heat exchanger 40, and a faucet 45 is provided at the tip thereof, and a safety valve 46 is provided in the middle to release abnormal steam.

The spout 47 of this safety valve 46 is connected to the holding member 30.
A steam pressure receiver 48 is provided and is opposed to the steam pressure receiver 48, so that the holding member 30 is moved in the same direction as the energization by the electromagnetic safety device 34.

In the above configuration, when the operating shaft 17 is pressed, the stepped portion 1
The switch 20 is pressed through the valve 7', the pilot valve 8 opens, and the cam 29 engages the rib 32.

At this time, the main valve T does not open because its valve rod 9 is located deep inside the inclined groove 24 of the switch 20.

Further, the holding body 33 of the holding member 30 is connected to the annular groove 2 of the switch 20.
It is out of 3.

Next, if you continue to rotate the operating shaft 17, the operating shaft 17
The cam 29 presses the pilot valve 15 to open and burns it, and also presses the rib 32 to open the holding member 30.
to the right and press the operating rod 36 of the electromagnetic safety device 34.

At the same time, the closing member 20 rotates, and its inclined groove 2
4, the main valve 7 is opened.

At this time, the holding member 30 remains at the right position without being subjected to any leftward biasing force due to the electromagnetic safety device 34 attracting and holding the operating rod 36 by the thermoelectromotive force of the thermocouple 35.
The holder 33 contacts the lower end of the switch 20 and the switch 2
0 is supported in that position, and the main valve 7 is maintained in an open state (FIG. 3).

When the faucet 45 is opened in this state and water is supplied, the water pressure-responsive gas valve 42 opens, the main burner 38 is ignited, and the water heater becomes operational.

Also, when the faucet 45 is closed after use, the main burner 38
The fire goes out.

If for some reason the hydraulic response gas valve 42 does not close or is delayed in closing, the pressure inside the heat exchanger 40 will rise abnormally and steam will flow from the jet port 47 of the safety valve 46 toward the steam pressure receiver 48. Gush out.

As a result, the holding member 30 is forcibly moved to the left, its holding body 33 faces the annular groove 23 of the switch 20, and the switch 20 is moved toward the holding member 30 by the urging force of the spring 27 (fourth figure).

As a result, the main valve 7 and the pilot valve 8 are closed, the main burner 38 and the pilot burner are extinguished, and heating of the heat exchanger 40 is stopped.

FIG. 5 shows another embodiment in which a steam pressure receiver 48 is attached to the operating rod 36 of the electromagnetic safety device 34, and the steam pressure from the safety valve 46 directly operates the electromagnetic safety device 34 to stop the flow of gas. The other configurations and operations are the same as those described above.

Although the above embodiment has been described as being used for a push-turn cock with an electromagnetic safety device, the main valve 7 is provided in the gas passage, and the main valve 7 is directly pressed to open with the operating shaft 17, and the holding member 30 is used to open the main valve 7. It can also be configured simply so that the state is maintained.

As described above, according to the present invention, even if a valve such as a water pressure-responsive valve fails to close for some reason, the main valve can be closed using steam from the hot water outlet passage, and the heat exchanger It has great effects, such as being able to prevent overheating and damage to equipment.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a water heater, Figs. 2 to 4 show a safety device according to an embodiment of the present invention, and Fig. 2 is a sectional view before use;
FIG. 3 is a sectional view during the mission, FIG. 4 is a sectional view during an abnormality, and FIG. 5 is a sectional view showing another embodiment. 3...Gas passage, 7...Main valve, 19...Operation shaft, 30...
Helmet holding member, 40... Heat exchanger, 44... Hot water tap passage, 4
6 Stomach - safety valve, 47... spout.

Claims (1)

[Claims] 1. A main valve provided in a gas passage of a burner that heats a heat exchanger, an operating shaft that opens the main valve, and a holding member that is moved by operation of the operating shaft and maintains the open state of the main valve. , a safety valve provided in the hot water outlet passage of the heat exchanger and having a spout thereof facing the holding member, the holding member being moved by the abnormal pressure of the steam ejected from the safety valve to close the main valve. A safety device for water heaters featuring a pattern of cylindrical dyeing.