JPS60147055A - Push-button operating device of water heater - Google Patents

Abstract

PURPOSE:To prevent the explosive ignition due to operational miss from occurring by a method wherein a solenoid-operated safety valve is made quickly closed at the stop of hot water delivery by utilizing the charging current to a capacitor. CONSTITUTION:A water valve 7 is interposed in a water passage connecting to a heat exchanger 1 and an automatic valve 17, which is open when water runs to the heat exchager, and a solenoid-operated safety valve 4, which is kept open by the electromotive force of a thermocouple 3 for combustion detection, are interposed in a gas passage connecting to the heating burner 2 of the heat exchanger. The depressing of a common pushbutton 8 causes the valve 7 to open and at the same time the valve 4 to open by pushing in order to ignite the burner 2. A capacitor, which is connected to power source when the pushbotton is not operated so as to be charged, is provided. When the pushbotton is operated, the discharge current from the capacitor is flowed through the solenoid 4a of the valve 4 in order to forcibly hold the valve 4 at the open state for a certain fixed period of time, while when the pushbotton is not operated, the charging current to the capacitor is flowed opposite in polarity to the voltage produced by the thermocouple 3 through the solenoid 4a. As a result, the valve 4 can be quickly closed at the stop of hot water delivery, resulting in preventing the explosive ignition due to operational miss from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides water pulp in a water passage leading to a heat exchanger, and a gas passage leading to a heating burner of the heat exchanger having a valve opened when water flows to the heat exchanger. The valve is held open by an automatic valve and a thermocouple for combustion detection.1. The present invention relates to a push-button operation device for a water heater which is provided with an electromagnetic safety valve.

Conventionally, this type of device is equipped with a water flow push button that fully operates the water valve and an ignition push button that operates a gas control unit incorporating an electromagnetic safety valve, and the electromagnetic safety valve is pushed open by suppressing the ignition push button. When the valve is opened to ignite the pilot burner, and the water valve is opened by pressing the hindlimb water flow push button to allow water to pass through the heat exchanger, the automatic valve is opened to ignite the pilot burner. I know of a type that has a burner-like ignition that allows the hot water to be dispensed, but this requires the operation of two push buttons to dispense hot water, which further improves operability. In this case, two push buttons are shared, so that the water valve can be fully opened by pressing the common push button, and the electromagnetic safety valve can be fully opened by pressing the same button to ignite the heating burner. It is desirable to be able to obtain hot water tapping operation. Furthermore, in this case, when the push button is not operated, it is connected to the power source.1. Even if a discharge current from the capacitor is passed through the solenoid of the safety valve when the push button is operated, and the pressure on the safety valve is released immediately after one ignition, a predetermined electromotive force will not be generated from the thermocouple. It is desirable to be able to forcibly hold the safety valve in the open state by discharging the capacitor until the time.

However, in such a one-touch push-button operation device, if the push button is operated to restart hot water immediately after the hot water has been extinguished by stopping the hot water tap, and before the thermocouple has cooled down completely, the electromagnetic safety valve will remain open. Therefore, even if the push button is not pushed all the way to the ignition position at the end of the push that causes the suppressed opening of the safety valve, heating can be performed in the operation area that causes the automatic valve to open by opening the water valve just before that. When the gas passage leading to the burner is opened and raw gas is released from the burner, if an erroneous operation is performed such as returning the push button from this operation area to the starting position and repeating this, then the This has the disadvantage of causing an explosion and ignition when the push button is pushed all the way to the ignition position.

In order to eliminate such inconvenience, the present invention aims to provide a device that can immediately close an electromagnetic safety valve when hot water is stopped by using charging current to a capacitor. A water valve is installed in the water passage leading to the heating burner of the heat exchanger, an automatic valve that opens when water flows to the heat exchanger is installed in the gas passage connected to the heating burner of the heat exchanger, and an electromotive force of a thermocouple for combustion detection. An electromagnetic safety valve that is held open at the same time is interposed, and when a common push button is pressed, the water pulp is opened, and the electromagnetic safety valve is pushed open to ignite the burner. A push-button operation device for a water heater, which includes a capacitor that is connected to a power source and is charged when the push button is not operated, and when the push button is operated, a solenoid of the electromagnetic safety valve receives discharge from the capacitor. In a device in which the electromagnetic safety valve is forcibly held in an open state for a certain period of time by applying current, when the push button is not operated, a charging current to the capacitor flows to the thermocouple with a polarity opposite to that of the thermocouple. - All features are as follows.

The present invention will be explained below with reference to the illustrated embodiments.

FIG. 1 shows the external appearance of a water heater connected with the device of the present invention, and inside the water heater, as shown in FIG. 2, there is a heat exchanger (1) and a heating A gas control unit (5) that includes a burner (2) and an electromagnetic safety valve (4) that is held open by the electromotive force of a thermocouple (3) for combustion detection as an operated member. and a water valve (7) interposed in the water passageway (6) leading to the heat exchanger (1).
-1 The gas control unit (
5) A common push button (8) that operates the water half (7)
It is well established.

The push button (8) can be pressed from the starting position tA to the rear terminal position B against the return spring (8a) K, and its narrow rod (
The return operation from the terminal position B is stopped at the intermediate position 7710 by the push-button mechanism (8c) assembled in 8b).
The gas control unit (5) is configured to return to the ρ starting position A by pressing the gas again.
The electromagnetic safety valve (4) is installed in the internal gas passage (9) leading to the heating burner (2) from the upstream side to the downstream side.
and a normally closed first gas valve 00 and a normally open second gas valve 01)
and a pilot burner (2a) arranged in parallel from the middle of both gas valves θ0 (Il+ to the side of the heating burner (2)).
The pilot gas passage (9a) connected to the valve shall be branched, and both gas valves 01αυ shall be assembled to a common valve rod (a),
The front end of the valve rod (A) is opposed to the first operating rod that is linked to the push button (8), and when the push button (8) is pressed from the starting position #A to the ending position B, the first operating rod 1 operation lever α■ is the valve lever (
b), the first gas valve 00 opens at the intermediate position C, and then the second gas valve 0) closes by pushing beyond the intermediate position 0 toward the terminal position 11B. nl, finally the valve a
Reno linked to 2? (14) through the electromagnetic safety valve (4).
) is pressed to open the water valve (7). The water valve (7) is composed of a spool-type valve, and the second operating rod part that is linked to the push button (8) is fully connected. and press the corresponding button (8
), the water valve (7) is opened to a predetermined opening degree at the intermediate position O by the suppression operation from the starting end position A, and the opening of the valve causes water to flow to the heat exchanger (1). , if the second water flow detector unit such as a water governor or a flow switch
The automatic valve (7) installed in the gas passage (9) on the downstream side of the gas valve (11) is opened.

Also, by pushing the push button (8) to the terminal position B, 1. The igniter 08), which is connected to the igniter burner (2a) once, as shown in Figure 5, is connected to the push button (8) as shown in Figures 3 and 4. Thin rod (8b
) is pressed against the cam protrusion (20a) protruding from the cam projection (20a), so that the second gas valve (11) is closed at the terminal position B of the push button (8). Ignition to burner (2a) is given11. When the second gas valve 01) is opened by returning the push button (8) to the intermediate position C, the water pulp (
Gas is supplied to the heating burner (2) through the automatic valve a'h''+, which is opened in advance by water flow to the heat exchanger (1) by opening the valve in step 7). The hot water tapping operation is made possible without ignition from the starter burner (2a).

Here, by returning the push button (8) from the terminal position B to the intermediate position 0, 1. The pressure on the electromagnetic safety valve (4) is released, and if the thermocouple (3) does not generate a predetermined electromotive force at this time, the nuclear safety valve (4) will close. In order to prevent this from happening, the power is turned off when the push button (8) is not operated! ′
A capacitor (1) is connected to I and charged, and when the push button (8) is operated, the solenoid (4a) of the safety valve (4) is connected to the
A discharge current from the capacitor a]) is applied to the vagina safety valve (4) so that the vaginal safety valve (4) can be forcibly held in an open state for a certain period of time after the suppression is released.

In more detail, the capacitor 0η is charged and discharged via a changeover switch as shown in Figure 5, and when the changeover switch (A) is pressed from the starting end position A of the button (8). By operation, n is pressed against the cam protrusion (22a) on the narrow rod (8b) at the intermediate position O, and is switched to the a contact side that discharges to the solenoid (4a), and When the push button (8) returns from the terminal position iB to the intermediate position C, first the discharge current from the capacitor all and then the thermocouple (
The safety valve (4) is held open by the electromotive force from 1. It was to so.

Here, according to the present invention, when the push button (8) is not operated, the charging current to the capacitor Q) is applied to the solenoid (4a) of the safety valve (4) with a polarity opposite to that of the thermocouple (3). In other words, by returning the push button (8) to the starting position A and switching the changeover switch (A) to the b contact side, the positive terminal of the power source A is switched to the changeover switch (goods). A closed circuit is formed through the capacitor Q]) and the solenoid (4a) to the negative electrode of the power source αO, and the charging current flows through the capacitor e1) to the solenoid (4a).
), the thermocouple (3) was made to flow in reverse polarity from the negative electrode side connection end to the positive electrode side connection end.

Next, to explain its operation, when the push button (8) is pressed to push the cylinder t''L from the terminal position Di and return it to the intermediate position C, water flows to the heat exchanger (1) as described above. The hot water can be tapped by igniting the heating burner (2).
Next, when the push button (8) is returned to the starting position A, the water valve (7) is closed and water flow is stopped, and the automatic valve 0η and the first gas valve 0 () are closed. 1 Heating burner (
2) Is the pilot burner (2a)? Extinguish the fire, including the fire.

At this time, the thermocouple (3) generates an electromotive force due to the residual heat even after the fire is extinguished, and the electromagnetic safety valve (4) closes slowly (12).
, If the push button (8) is suppressed from the starting end position A before this valve closing, when the automatic valve 0't) is opened at the intermediate position O due to the opening of the water valve (7), the electromagnetic safety valve is activated. (4) The first and second gas valves Q (1 (1
, 11 and the automatic valve θ are fully valved and supplied to the heating burner (2).Due to incorrect operation, the push button (8) may not be pushed all the way to the end position B and may be held at the intermediate position C for a long time, or the push button (8) may be held at the intermediate position C for a long time, or the button may be held at the starting end position. When the suppression operation is repeated between A and intermediate position O, a large amount of raw gas is released, and then the terminal position 1i of push button (8)
If the igniter 08) is activated by pressing the button B, there is a possibility that an explosive ignition will occur.

However, according to the present invention, the push button (8) returns to the starting position A! llll Solenoid (4a) of the safety valve (4)
When the thermocouple (3) melts, a charging current of opposite polarity flows n9, and this charging current cancels out the electromotive force from the thermocouple (3).
When the safety valve (4) is closed immediately, the above-mentioned inconvenience does not occur.

According to the present invention, when hot water is stopped, the electromagnetic safety valve is immediately closed without waiting for the thermocouple to cool down, and the automatic valve is opened when the water pulp is opened by pressing the push button again.
However, gas is not supplied to the heating burner unless the safety valve is pushed all the way to the final position where the valve is pressed open, which has the effect of preventing explosions and ignitions caused by erroneous operation.

[Brief explanation of the drawing]

Figure 1 shows the present invention f&'? A front view of an example of the water heater equipped with the water heater, FIG. 2 is a cut-away plan view of its mounting part, FIG. 3 is a side view taken along the line m--m in FIG. 2, and FIG. FIG. 5, which is a sectional view taken along the line IV, is an electrical circuit diagram thereof. (1) Heat exchanger (2) Heating burner (3
)...Thermocouple (4)...Solenoid safety valve (4a)...
・Solenoid P (6)...Conduit (7)...Water valve (8)...Push button (9)...Gas passage Ql...
Power supply Q1)... 2 people outside the capacitor - 8 -

Claims (1)

[Claims] A water valve is installed in the water flow path leading to the heat exchanger, an automatic valve that opens when water flows to the heat exchanger, and a thermocouple for combustion detection is installed in the gas path leading to the heating burner of the heat exchanger. An electromagnetic safety valve that is held open by an electromotive force is provided, and when a common push button is pressed, the water valve is opened, and the electromagnetic safety valve is pushed open to ignite the burner. The push-button operation device for a water heater is equipped with a capacitor that is connected to a power source to be charged when the push button is not operated, and when the push button is operated, a solenoid of the electromagnetic safety valve is connected to a capacitor. In a device in which the electromagnetic safety valve is forcibly held in an open state for a certain period of time by flowing a discharge current, when the push button is not operated, a charging current to the capacitor flows through the solenoid with a polarity opposite to that of the thermocouple. A push-button operation device for a water heater, characterized in that