JPH08312941A - Gas water heater - Google Patents

Abstract

PURPOSE: To prevent gas from accidentally leaking due to the fluctuation of supply water pressure, and to heighten its safety, by presetting the on-off of a water pressure switch after the closure of an automatic water pressure valve for the gas, in a gas water heater having structure wherein valves on the gas side, such as a solenoid safety valve and an apparatus stopcock are instantly closed when a water pressure switch is turned off. CONSTITUTION: A water pressure switch S1 is driven by on-off control by an automatic water pressure valve V2 for gas and an actuating cam 10 to be operated together with a pressure responding device A. When the water pressure switch S1 is turned on, an electric holding current from a controller C is applied to a solenoid safety valve MV and an igniter is simultaneously turned on, and thus ignition and combustion for a burner 32 are performed. When fire is extinguished and hot-water supply is stopped, the actuating cam 10 is operated together with a diaphragm 14 in the device A, and the water pressure switch S1 is turned off before the automatic water pressure valve V2 is closed in the right stroke of a slider. On the other hand, when fire is ignited and hot-water supply is started, the water pressure switch S1 is turned on after the automatic water pressure valve V2 is opened in the left stroke of the slider. Therefore, the gas is prevented from leaking accidentally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas water heater.

[0002]

2. Description of the Related Art In a gas water heater having a structure in which a valve on the gas side such as an electromagnetic safety valve or a device stopper is immediately closed when the water pressure switch is turned off, the conventional technique is, for example, the operation line of the conventional example shown in FIG. As shown in the figure, the water pressure switch is turned off after the water pressure automatic gas valve is completely closed, and the water pressure switch is turned on after the water pressure automatic gas valve is slightly opened.

[0003]

In the above-mentioned prior art, for example, when another branched water faucet in the middle of the water supply pipe is opened during use of the gas water heater, Since the water supply pressure drops, the automatic water pressure gas valve that works in conjunction with the hydraulic pressure response device closes and the gas burner extinguishes, but the water pressure switch does not turn off completely, and if you then close another branched faucet. Since the water supply pressure rises, the automatic water pressure gas valve is opened.

Therefore, since the water pressure switch is still ON, the holding current from the controller is in the ON state, and when the thermocouple type and the thermoelectromotive force of the thermocouple are present, the electromagnetic safety valve is attracted. Since it is in an open state, there was a risk of releasing raw gas.

In order to prevent the release of the raw gas, it is necessary to set ON / OFF of the water pressure switch to the opening start point of the automatic water pressure gas valve (the opening start point and the closing end point of the automatic water pressure gas valve). However, since high precision is required for its setting, it requires a high level of skill and labor for manufacturing, which is not only extremely difficult, but gas leakage due to errors due to loosening, wear, etc. may occur early. is there.

In view of the above problems of the prior art, an object of the present invention is to provide a gas water heater with improved safety by eliminating accidental gas leakage due to fluctuations in the water supply pressure.

[0007]

In order to achieve the above object, a gas water heater of the present invention is provided with an electromagnetic safety valve MV, an instrument plug V ₁ as shown in the drawings corresponding to the embodiments. in gas water heaters of structure pressure switch S ₁ the valve on the gas side is immediately closed when turned OFF etc., set the pressure switch S ₁ to oN, the OFF setting after opening the hydraulic automatic gas valve V ₂ It features a configuration.

Further, OFF the pressure switch S ₁ before the water pressure automatic gas valve V ₂ is closed, and wherein the configuration of ON water pressure switch S ₁ after the open hydraulic automatic gas valve V _2.

[0009]

Since the gas water heater of the present invention is configured as described above, when the hydraulic pressure automatic gas valve V ₂ is closed due to a decrease in the water supply pressure, the hydraulic pressure is controlled before the hydraulic pressure automatic gas valve V ₂ is closed. Since the switch S ₁ is turned off, the gas side valve is immediately closed.

[0010] If the water pressure automatic gas valve V ₂ and the water supply pressure is increased is opened, because the water pressure switch S ₁ after the hydraulic automatic gas valve V ₂ is opened turns ON, the subsequent, ON igniter
Then, the electromagnetic safety valve MV and the instrument plug V ₁ are sequentially opened, and the transition to normal combustion is reliably performed.

[0011]

Embodiments of the gas water heater according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic exploded sectional view of a mixing type main stop type gas water heater to which the present invention is applied, and FIG. 2 is a sectional view showing details of only a main part thereof. MV is an electromagnetic safety valve. The safety valve 3 which is installed on the upstream side of the gas supply path 1 and is urged in the closing direction by the spring 2 is adsorbed and held open by the electromagnet 5 in the holding current ON state via the adsorption plate 4, and the electromagnet 5
The safety valve 3 is structured such that the safety valve 3 is automatically closed by the spring 2 when the holding current to is turned off.

M is a motor, for example, a geared motor with a reduction gear, etc., and an operating body 6 described later is integrally provided on its output shaft, and the operating body 6 interlocks with the motor M to force the electromagnetic safety valve MV. In addition to opening the valve automatically, a so-called motor valve is configured in which the gas side valve such as an instrument plug V ₁ and the water side valve such as a faucet WV, which will be described later, are controlled by the rotation control of a single motor M. ing.

A cam body is used as the actuating body 6, and although not shown in the figure, an electromagnetic safety valve driving cam for driving the electromagnetic safety valve MV and an instrument stopper driving device for driving the instrument stopper V ₁ are used. A cam and a faucet driving cam for driving the faucet WV are provided, and a cam switch driving cam for driving the cam switches S ₂ and S ₃ is also provided.

V ₁ is an instrument plug, which is provided downstream of the gas supply path 1 by being biased in the closing direction by a spring 7, and is opened and closed by a cam body 6 driven by the motor through a valve shaft 8 thereof. It is designed to be driven.

V ₂ is a hydraulic automatic gas valve, which is a gas supply path 1
Between the electromagnetic safety valve MV and the instrument plug V ₁ (middle flow portion), which is urged in the closing direction by the return spring 9, and is driven by the motor-driven cam body 6 described later and It is adapted to be opened and closed by being interlocked with each other via the water pressure responsive device A.

S ₁ is a water pressure switch, which is an actuating cam 10 that works together with the water pressure automatic gas valve V ₂ and the water pressure response device A.
When the water pressure switch S ₁ is turned on, the holding current from the controller C is made to flow through the electromagnet 5 of the electromagnetic safety valve MV, and at the same time the igniter is turned on and the spark for ignition is blown from the electrode. S ₁
When is turned off, all of them are turned off.

A specific structure for turning on and off the water pressure switch S ₁ is, for example, as shown in FIG.
A slider 12 having an actuating cam 10 integrally provided via a hydraulic automatic gas valve V ₂ and its valve shaft 11 is biased to a switch OFF side (right side in the drawing) by a spring 13, and the slider 12 is hydraulically actuated. The actuating cam 10 is associated with the push shaft 15 which is integral with the diaphragm 14 of the device A and with the actuating cam 10 with the switch shaft 16 of the hydraulic switch S ₁ .

Further, the operating cam 10 is the operating cam 1
It is provided in such a shape that the water pressure switch S ₁ is turned on and off with a certain time difference by moving 0 forward and backward by a certain stroke. For example, at the time of extinguishing the fire and stopping the hot water, the diaphragm 14 of the water pressure responsive device A is The slider 12 is moved to the right in the figure by a certain stroke in conjunction with the hydraulic automatic gas valve V ₂ before the actuating cam 10 pushes up the switch shaft 16 to turn off the hydraulic switch S ₁ (Fig. (See the lower half of 2). During ignition and hot water discharge, the slider 12 moves leftward in the figure by a certain stroke to open the hydraulic automatic gas valve V ₂ and then push up the switch shaft 16 with the actuating cam 10. Turn on water pressure switch S ₁
(See the upper half of FIG. 2), the water pressure switch S
The ON / OFF setting of ₁ is set after the hydraulic automatic gas valve V ₂ is opened (see the embodiment of the present invention in FIG. 3).

WV is a faucet, which is equipped on the upstream side of the water supply path 17 using a diaphragm-type water supply valve. It has a structure for opening and closing by water supply pressure to supply water to the heat exchanger 21 and stop water supply. The pilot valve 19 is moved forward and backward by the motor-driven cam body 6 via the operating lever 22.

On the downstream side of the faucet WV, a hydraulic pressure responding device A is provided.
The slider 12 having the actuating cam 10, the automatic hydraulic gas valve V ₂ and the water governor 23 are provided so as to interlock with the diaphragm 14 of the hydraulic pressure responding device A.

A faucet WV is provided on the faucet driving cam of the cam body 6.
Lever 2 for moving the pilot valve 19 of the vehicle back and forth
Connect the base end of 2 to the electromagnetic safety valve MV on the electromagnetic safety valve drive cam.
Shaft 25 urged by spring 24 that pushes open safety valve 3 of
Of the valve shaft 8 of the instrument plug V ₁ to the instrument plug drive cam, and the cam switch S to the cam switch drive cam.
₂ and S ₃ respectively, the hydraulic automatic gas valve V ₂ and the electromagnetic safety valve M while the cam body 6 is rotated by the motor M by a predetermined angle (for example, 360 degrees).
The safety valve 3 of V and the device stopper V ₁ are driven to open and close under a fixed priority, and the rotational position of the cam body 6 is detected by the cam switches S ₂ and S ₃ .

An ignition switch S ₄ interlocking with the operation button 26 is connected to the motor M via a controller C,
For example, when the operation button 26 is ignited during ignition, the ignition switch S ₄ is held ON and the motor M is rotated under the control command from the controller C.

V ₃ is a hot water temperature control valve, which is the operation button 26.
And the amount of water supplied to the heat exchanger 21 via the water supply pipe 29 and the mixer B via the water supply pipe 30 by rotating the operation button 26. The amount of water supplied for mixing can be adjusted to adjust the hot water temperature, and a water-only water discharge path can be configured. When water is discharged, the operation button 26 is turned to the "water discharge" position. When set, the cam 31 provided on the gear 28 actuates the water discharge switch S ₅ to turn on all the functions required for boiling water.
The FF is used to ensure that only water can be discharged.

In the figure, 32 is a main burner, 33 is a hot water outlet pipe,
34 is a strainer, V ₄ is a gas governor, and V ₅ is a capacity switching valve.

In the above construction, when the water supply pressure is drastically reduced while the gas water heater is in use, for example, by opening another tap in the middle of the water supply pipe, the water pressure responder A is interlocked. The hydraulic automatic gas valve V ₂ may be closed to extinguish the main burner 32. At this time, the hydraulic switch S ₁ is turned off before the hydraulic automatic gas valve V ₂ is closed to maintain the holding current to the electromagnetic safety valve MV. Is turned off, the electromagnetic safety valve MV is closed and the gas supply is stopped.

Further, if the water pressure automatic gas valve V ₂ water supply pressure is increased by closing the other faucet is opened, because the water pressure switch S ₁ is turned ON to open the hydraulic automatic gas valve V _2, After that, the holding current to the electromagnetic safety valve MV is turned on, the igniter is also turned on, and ignition and hot water can be continued without any trouble.

An outline of the operation of the gas water heater of the above embodiment will be described below with reference to FIG.

When the operation button 26 is operated to ignite and discharge hot water, the ignition switch S ₄ is held ON and the motor M is activated to rotate the cam body 6 in a predetermined direction by a predetermined angle (approximately 72 °). As a result, first, the faucet WV is opened by the faucet drive cam and water is passed to the heat exchanger 33. Therefore,
When the cam switch S ₂ detects this, the motor M temporarily stops and stands by until the water pressure switch S ₁ is turned on.

When the water pressure switch S ₁ is turned on after the water pressure automatic gas valve V ₂ is opened via the water pressure response device A by the water supply pressure, the motor M is started again and the cam body 6 is moved by a predetermined angle in a predetermined direction. When rotated, the safety valve 3 of the electromagnetic safety valve MV is fully opened by the electromagnetic safety valve driving cam in the range of 80 ° C. to 230 ° (rotation angle of about 170 °), and the adsorption plate 4 is pressed against the electromagnet 5.

At this time, when the cam switch S ₃ detects that the electromagnetic safety valve MV is fully opened due to the restart of the motor M, the holding current to the igniter and the electromagnet 5 is turned on to hold the safety valve 3 of the electromagnetic safety valve MV in the suction open state. At the same time, the spark for ignition is blown from the electrode by the discharge of the igniter.

Thereafter, the range of 255 ° to 305 ° (approximately 5)
At a rotation angle of 0 °), the instrument plug V ₁ is opened by the instrument plug drive cam to open the gas supply path 1 to open the main burner 32.
The main burner 32 starts combustion. At this time, the cam switch S ₃ is set to 334 ° when the instrument plug V ₁ is fully opened.
When detected at the point of rotation (approximately 32.5 °), the motor M is stopped and a series of ignition and hot water discharge operations are completed.

Next, when extinguishing the fire and stopping the hot water discharge, when the operation button 26 is extinguished, the holding of the ignition switch S ₄ is released, and the holding current of the electromagnetic safety valve MV is turned off.
Is activated and the cam body 6 is returned to the fire extinguishing position (position of 0 °), the water faucet WV, the automatic water pressure gas valve V ₂ and the instrument faucet V ₁ are closed, and the push open of the electromagnetic safety valve MV is also released. .

[0034] At this time, closes the electromagnetic safety valve MV and OFF pressure switch S ₁ is before the water pressure automatic gas valve V ₂ is closed, the cam switch S ₂ to return to the extinguishing position of the cam member 6,
When S ₃ confirms, the motor M is stopped and the fire extinguishing and hot water discharge stopping operations are completed.

It should be noted, ON hydraulic switches S _1, provided a monitoring sequence for monitoring the OFF constant, the motor for monitoring the overload of the motor M overload monitoring sequence, for example, water pressure switch S ₁ in the sequence proceeds When it is turned off, priority is given to turning off the water pressure switch S ₁ , and when the motor is unnecessarily loaded, the motor M is immediately stopped to improve safety.

[0036]

In the gas water heater of the present invention, the ON / OFF setting of the water pressure switch is set after the automatic water pressure gas valve is opened, so that accidental gas leakage due to fluctuations in the water supply pressure is prevented before use. It is safe.

Further, for setting the ON / OFF of the water pressure switch, for example, a structure in which the water pressure switch is turned ON / OFF with a certain time lag by an actuating cam may be adopted, so that high precision is not required. . Therefore, it is easy to manufacture, there is no fear of causing an operation error, and the cost is low, which is excellent in practicality.

[Brief description of drawings]

FIG. 1 is a schematic development sectional view of an entire gas water heater according to the present invention.

FIG. 2 is a sectional view of an operating state showing details of a main part.

FIG. 3 is a diagram showing a relationship between ON / OFF of a water pressure switch and opening / closing of a water pressure automatic gas valve in comparison with a conventional example.

FIG. 4 is an explanatory diagram showing a relationship between a rotation angle of a cam body and each valve operation.

[Explanation of symbols]

MV Electromagnetic safety valve V ₁ Instrument plug S ₁ Water pressure switch V ₂ Water pressure automatic gas valve

Claims (3)

[Claims] 1. A gas water heater having a structure in which a valve on the gas side such as an electromagnetic safety valve and a device stopper is immediately closed when the water pressure switch is turned off. The water pressure switch is turned on and off by opening a water pressure automatic gas valve. A gas water heater characterized by being set after the valve. 2. The gas water heater according to claim 1, wherein the water pressure switch is turned off before the water pressure automatic gas valve is closed. 3. The gas water heater according to claim 1, wherein the water pressure switch is turned on after the water pressure automatic gas valve is opened.