JPH0596743U - Gas water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To improve safety by eliminating accidental gas leakage due to fluctuations in water supply pressure. [Configuration] Electromagnetic safety valve MV, the gas water heater having a structure pressure switch S ₁ the gas side of the valve, such as a plug fitting V ₁ is to immediately closed becomes OFF, the pressure switch S ₁ of the ON, OFF
Set the water pressure switch S before the automatic water pressure gas valve V ₂ is closed.
₁ is OFF, pressure switch S ₁ is a configuration in which ON to open the hydraulic automatic gas valve V _2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a gas water heater.

[0002]

[Prior 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 shown in the operation diagram of the conventional example of FIG. 3, for example. As described above, 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]

[Problems to be solved by the device]

 In the above conventional technique, for example, when the other water tap that is branched in the middle of the water supply pipe is opened while the gas water heater is in use, the water supply pressure to the gas water heater decreases, so the water pressure response Although the automatic gas valve for hydraulic pressure that works with the device closes and the gas burner extinguishes, the hydraulic switch does not turn off completely, and then when the other diverged taps are closed, the water supply pressure rises. The hydraulic automatic gas valve is opened.

Therefore, since the water pressure switch remains 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 time for manufacturing, which is not only extremely difficult but also causes gas leakage due to errors due to loosening, wear, etc. at an early stage. Sometimes.

In view of such problems of the conventional technology, the present invention aims to provide a gas water heater with improved safety by eliminating accidental gas leakage due to fluctuations in the water supply pressure.

[0007]

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the gas water heater of the present invention, for example, as shown in the drawings corresponding to the embodiment, uses a solenoid valve MV, a device valve V _{1 and} other gas side valves for hydraulic pressure. A gas water heater having a structure in which the switch S ₁ is immediately closed when turned off is characterized in that the water pressure switch S ₁ is turned on and off after the hydraulic automatic gas valve V ₂ is opened.

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

[0009]

[Action]

Gas water heaters of this invention, since the structure described above, when the water pressure automatic gas valve V ₂ water supply pressure is lowered is closed, water pressure switch S before the water pressure automatic gas valve V ₂ is closed _{Since 1} turns off, the gas side valve is closed immediately.

When the hydraulic pressure automatic gas valve V ₂ is opened due to an increase in the supply water pressure, the hydraulic pressure switch S ₁ is turned on after the hydraulic pressure automatic gas valve V ₂ is opened, and then the igniter is turned on to turn on the electromagnetic safety valve. The MV and the instrument plug V ₁ are sequentially opened, and the transition to normal combustion is reliably performed.

[0011]

【Example】

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

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

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

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 a tool plug for driving the instrument plug V ₁ It has a driving cam and a faucet driving cam for driving the faucet WV, and also a cam switch driving cam for driving the cam switches S ₂ and S ₃ .

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 installed between the electromagnetic safety valve MV of the gas supply path 1 and the instrument plug V ₁ (middle flow portion) by urging the return spring 9 in the closing direction, A water faucet WV, which will be described later, driven by a driving cam body 6 and a hydraulic pressure responding device A, which will be described later, are interlocked with each other to open and close.

S₁Is a water pressure switch, and the water pressure automatic gas valve V₂At the same time, it is turned on and off by an actuating cam 10 that operates in cooperation with the water pressure responding device A, and the water pressure switch S₁When 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 to blow the spark for ignition from the electrode, and the water pressure switch S ₁ When is turned off, all of them are turned off.

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

The actuating cam 10 is provided in a shape that drives the water pressure switch S ₁ to be turned on and off with a certain time lag by moving the actuating cam 10 forward and backward by a certain stroke. In addition, when the tapping is stopped, the slider 12 moves in conjunction with the diaphragm 14 of the hydraulic pressure responding device A to the right in the figure by a certain stroke, whereby the switch shaft by the actuating cam 10 is closed before the hydraulic automatic gas valve V ₂ is closed. When the water pressure switch S ₁ is turned off by releasing the push-up of 16 (see the lower half of Fig. 2), the slider 12 moves to the left side in the figure by a certain stroke during ignition and hot water discharge, so that the automatic hydraulic gas valve V ₂ is oN water pressure switch S ₁ switches shaft 16 Te pushed down by the operation cam 10 to open as a (half see top of FIG. 2), the water pressure switch S ₁ of the oN, OFF The setting is made 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 installed on the upstream side of the water supply path 17 using a diaphragm-type water supply valve. The diaphragm valve 18 is opened and closed by opening and closing the valve hole 20 by connecting and disconnecting the pilot valve 19 to and from the diaphragm valve 18. The structure is such that 18 is opened and closed by the water supply pressure to supply water to the heat exchanger 21 and stop water supply. The pilot valve 19 is moved back and forth by the motor-driven cam body 6 via the operating lever 22.

A water pressure responsive device A is provided in series on the downstream side of the faucet WV, and a slider 12 having the actuating cam 10 on a diaphragm 14 of the water pressure responsive device A, a water pressure automatic gas valve V ₂ and a water governor. It is provided so as to interlock with 23.

The base end portion of the operating lever 22 for moving the pilot valve 19 of the faucet WV forward and backward to the faucet driving cam of the cam body 6, the safety valve 3 of the electromagnetic safety valve MV to the electromagnetic safety valve driving cam. The tip end of the pressing shaft 25 urged by the spring 24, the tip of the valve shaft 8 of the instrument plug V ₁ to the instrument plug driving cam, and the cam switch S ₂ to the cam switch driving cam. The hydraulic automatic gas valve V ₂ , the safety valve 3 of the electromagnetic safety valve MV, and the instrument plug V while the cam body 6 rotates by a predetermined angle (for example, 360 degrees) predetermined by the motor M in association with S ₃ respectively. ₁ is 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 .

[0023] The motor M is, the ignition switch S ₄ in conjunction with the operation button 26 is connected via a controller C, for example, when the ignition operation of the operation button 26 at the time of ignition, the ignition switch S ₄ is held ON The motor M is adapted to rotate under the control command from the controller C.

V ₃ is a hot water temperature control valve, which is connected to the operation button 26 via gears 27 and 28, and is supplied to the heat exchanger 21 via a water supply pipe 29 by rotating the operation button 26. The amount of water supplied to the mixer B and the amount of water supplied to the mixer B through the water supply pipe 30 for mixing can be adjusted to control the hot water temperature, and a water-only water discharge path can be configured. , during the flood and OFF functions lengthen all the required flooding switch S ₅ by a cam 31 provided on the tooth wheel 28 when rotated set kettle operated to the position of "Izumi" the operation button 26, the water only Is sure to be possible.

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 structure, when the gas water heater is in use, for example, when the water supply pressure drops abruptly due to the opening of another branched faucet in the middle of the water supply pipe, the water pressure responding device A is interlocked. There is a case where the automatic water pressure automatic gas valve V ₂ is closed and the main burner 32 extinguishes, but at this time, the hydraulic pressure switch S ₁ is turned off before the automatic water pressure automatic gas valve V ₂ is closed and the electromagnetic safety valve MV is turned off. Since the holding current 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 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 ignited for ignition and tapping, 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 °). By doing so, first, the faucet WV is opened by the faucet driving cam to pass water to the heat exchanger 33. Therefore, when the cam switch S ₂ detects this, the motor M is temporarily stopped and stands by until the hydraulic 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 set in a predetermined direction. In the range of 80 ° C to 230 ° (rotational angle of about 170 °), the electromagnetic safety valve driving cam pushes the safety valve 3 of the electromagnetic safety valve MV fully open to push the adsorption plate 4 to the electromagnet 5 by rotating the angle.

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, and the safety valve 3 of the electromagnetic safety valve MV is attracted and held open. At the same time, the ignition spark is blown from the electrodes by the discharge of the igniter.

Thereafter, in the range of 255 ° to 305 ° (rotation angle of about 50 °), the instrument plug V ₁ is opened by the instrument plug drive cam, the gas supply path 1 is opened, and the main burner 32 is ignited. The main burner 32 starts burning. At this time, when the full opening of the appliance plug V ₁ is detected when the cam switch S ₃ has rotated 334 ° (approximately 32.5 °), the motor M is stopped and a series of ignition and tapping operations are completed.

Next, when extinguishing the fire and stopping the hot water discharge, when the operation button 26 is extinguished, the motor M is activated simultaneously with the release of the ON state of the ignition switch S _{4 and} the OFF of the holding current of the electromagnetic safety valve MV, causing the cam body 6 to move. When it is returned to the fire extinguishing position (position of 0 °), the water faucet WV, the automatic hydraulic 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.

At this time, before the automatic hydraulic gas valve V ₂ is closed, the hydraulic switch S ₁ is turned off to close the electromagnetic safety valve MV, and the cam switches S ₂ and S ₃ are returned to the fire extinguishing position. The motor M is stopped and the fire extinguishing and tapping stop operations are completed.

The water pressure switch S₁A monitoring sequence for constantly monitoring ON / OFF of the motor and an overload monitoring sequence for the motor for monitoring overload of the motor M are provided.₁When is turned off, the water pressure switch S ₁ Is prioritized, and if the motor is overloaded, the motor M is immediately stopped to improve safety.

[0036]

[Effect of the device]

 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 accidental gas leakage due to fluctuations in the water supply pressure is prevented and is safe for use. .

Further, for setting 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, and therefore high accuracy is required. Nor. Therefore, it is easy to manufacture, there is no risk 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 stopper S ₁ Water pressure switch V ₂ Water pressure automatic gas valve

Claims (3)

[Scope of utility model registration request] 1. A gas water heater having a structure in which a gas-side valve such as an electromagnetic safety valve or a device stopper is immediately closed when the water pressure switch is turned off, and 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.