JPH045893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water heater equipped with a gas burner as a heat source.

(Prior Art) The applicant of the present application has developed an apparatus of this type, for example, a small wall-mounted water heater, by first installing a water valve in a water passage connected to a heat exchanger, and a gas supply line connected to a main burner that heats the heat exchanger. a pilot gas passage that is connected to a pilot burner by interposing a valve and a gas valve on the downstream side of the main valve in the gas supply path, and branching from the middle of the gas supply path between the main valve and the gas valve; In those with
Ignition of the pilot burner by opening the main valve, flow of water to the heat exchanger by opening the water valve, and discharge from the pilot burner by opening the gas valve associated with the water flow. In order to sequentially ignite the main burner and perform the hot water tapping operation, a push button skillfully utilizes a heart cam mechanism known from Japanese Patent Publication No. 1767-1972 and Publication No. 12334-1974. He proposed an operable type (for example, Japanese Patent Application Laid-Open No. 61-41824
(see publication).

(Problems to be Solved by the Invention) However, the above-mentioned proposal had the disadvantage that a relatively strong operating force was required to move the pin within the cam groove when pressing the push button. .

(Means for Solving the Problems) The present invention aims to solve the above-mentioned disadvantages, and includes a water valve in the water passage connected to the heat exchanger.
A main valve is provided in a gas supply path connected to a main burner that heats the heat exchanger, and a gas valve is provided downstream of the main valve in the gas supply path. Providing a pilot gas passage branching from the middle of the gas valve and connecting to the pilot burner, igniting the pilot burner by opening the main valve, and passing water to the heat exchanger by opening the water valve; In a device in which hot water is drawn by sequentially igniting the main burner from the pilot burner by opening the gas valve as the water flows, the main valve is operated by an operating switch. The water valve is configured to be opened when energized by operation, and the water valve is configured to be opened by a detection signal from a flame detector that detects ignition of the pilot burner.

(Function) The present invention has the above configuration, and according to this, the main valve is opened by operating the operation switch and the pilot burner is ignited, and the water valve is activated by the detection signal from the flame detector that detects the ignition. The valve is opened to allow water to flow through the heat exchanger, and the flow of water causes the gas valve to open and ignition from the starter burner of the main burner to perform the hot water tapping operation. In this case, the relatively weak operating force needed to turn the switch on and off is sufficient.

(Example) Next, an example of the present invention will be described based on the drawings.

In FIG. 1, 1 is a main burner, 2 is a starter burner, and 3 is a heat exchanger heated by the main burner 1. A gas supply path 4 connected to the main burner 1 has an electromagnetic on-off valve, which is a main valve. 5 and a hydraulically responsive valve 6 which is a gas valve downstream thereof are interposed, and a pilot gas passage 7 connected to the pilot burner 2 branches from between the electromagnetic on-off valve 5 and the hydraulically responsive valve 6 of the gas supply path 4. A water passage 8 is provided and connected to the heat exchanger 3.
An electromagnetic on-off valve 9, which is a water valve, and a hydraulic response member 10 on the downstream side thereof are interposed.

A spark plug 11 and a flame rod 12 serving as a flame detector are provided facing the pilot burner 2.

The hydraulic response member 10 is composed of, for example, a water governor and an operating rod connected thereto, and is activated by water flowing through the heat exchanger 3 to open the hydraulic response valve 6.

13 is a control circuit in which a relay 14, a coil 5a of the electromagnetic on-off valve 5, and an igniter 15 including the spark plug 11 are connected in parallel to a power source (not shown); Interposed between them are a manually operated automatic return A contact type contact switch 16, a manually operated automatic return B contact type contact switch 17, and an A contact 14a of the relay 14 that is parallel to the contact switch 16. Connected.

Reference numeral 18 denotes a drive circuit for the electromagnetic on-off valve 9 in which a power supply (not shown), an ignition confirmation switch 20 that closes in response to an ignition signal from the flame detection circuit 19 including the flame rod 12, and a coil 9a of the electromagnetic on-off valve 9 are connected in series. shows.

The flame detection circuit 19 amplifies the flame current flowing through the flame rod 12 and uses the amplified current to energize a relay (not shown), and the ignition confirmation switch 20 is constituted by the a contact of the relay.

In this case, when the contact switch 16 is operated by contact, the coil 5a and the igniter 15 are energized, the electromagnetic shut-off valve 5 is opened, and the spark plug 1 is opened.
1 generates a spark and the pilot burner 2 is ignited. According to this ignition, a flame current flows through the flame rod 12, energizes the relay of the flame detection circuit 19, closes the ignition confirmation switch 20 consisting of its a contact, energizes the coil 9a, opens the electromagnetic shut-off valve 9, and heats up the flame rod 12. Water is supplied to the exchanger 3. According to this water flow, the hydraulic response valve 6 is opened by the movement of the operating rod of the hydraulic response member 10, the main burner 1 is ignited from the starter burner 2, the heat exchanger 3 is heated, and hot water is tapped. It is done.

After that, to stop the hot water supply, press the contact switch 1.
When the contact between coil 9a and coil 9a is released, the coil 5a is de-energized and the electromagnetic on-off valve 5 is closed, both burners 1 and 2 are extinguished, and the coil 9a is de-energized and the electromagnetic on-off valve 9 is closed. , water flow to the heat exchanger 3 is stopped.

Incidentally, in the above embodiment, the ignition operation switch and the extinguishing operation switch are constructed as separate switches, but they may of course be constructed as one common switch. Further, in the above embodiment, the flame rod 12, the flame detection circuit 19, the ignition confirmation switch 20, and the drive circuit 18
The opening and closing of the on-off valve 9 was controlled by an electromagnetic water valve, and the thermocouple facing the pilot burner 2 was connected to the coil 9a.
The electromagnetic opening/closing valve 9 may be controlled to open or close depending on the presence or absence of an electromotive force from the thermocouple. Further, in the above embodiment, the water valve and the main valve are constituted by the electromagnetic on-off valves 9 and 5, but a motor is used instead of the coils 9a and 5a, and the coils 9a and 5a are rotated and opened by the energization operation of the motor.
It may also be configured with a rotating plug that closes with a return spring when the energization is stopped.

By adding a water flow throttle valve 21 and its control circuit 22 as shown in FIG. 2 to the system shown in FIG. When the device is used again after it has been stopped, the hot water must be turned on at a low temperature to prevent burns.

To explain this in more detail, if you want to obtain high-temperature hot water, close the manually operated, automatically reset, normally open contact type switch 23 only long enough to reach the opening of the water flow restrictor 21 that corresponds to the desired water temperature. During that time, the motor 24 is rotated in the direction shown by the solid line, which turns the water flow throttle valve 21 into the throttling direction, against the elastic force of a return spring (not shown), and the water flow throttle valve 21 interlocked with this is adjusted to the desired hot water temperature. Tighten to the corresponding opening. After that time has elapsed, the switch 23 is opened and the elastic force of the return spring attempts to rotate the motor 24 in the direction shown by the dotted line to open the water throttle valve 21, but at this time the solenoid 25 is energized. Since the operating rod 25a enters into the cam groove 26a of the cam 26 that interlocks with the motor 24, the cam 26 and the motor 24 are restrained, and the water flow restricting valve 21 is maintained at the desired opening degree. , hot water at the desired temperature can be obtained. If you want to obtain even hotter water, you can close the switch 23 again. Next, if you want to obtain low-temperature hot water, open the manually operated automatic return normally closed contact type switch 27 only until the opening of the water flow restricting valve 21 corresponds to the desired water temperature, and during that time the solenoid 25 The energization is stopped and the operating rod 25a is removed from the cam groove 26a of the cam 26. As a result, the return spring causes the motor 24 to rotate in the direction shown by the dotted line to open the water throttle valve 21. Open to the degree corresponding to the desired water temperature. After that time has elapsed, the return spring attempts to rotate the motor 24 in the direction of fully opening the water throttle valve 21, but at this time, the solenoid 25 is energized and its operating rod 25a enters the cam groove 26a of the cam 26. As a result, the cam 26 and the motor 24 are restrained, and the water flow restricting valve 21 is therefore maintained at the desired opening degree, making it possible to obtain low-temperature hot water at the desired temperature. Furthermore, when the water heater is stopped, the ignition confirmation switch 20 is opened, so the solenoid 25 is not energized, and the engagement between the operating rod 25 and the cam groove 26a of the cam 26 is released, and the cam 26 is no longer restrained. When the water is released, the motor 24 rotates in the direction shown by the dotted line due to the elastic force of the return spring, and the water flow restricting valve 21 is fully opened. Never happened.

(Effects of the Invention) According to the present invention, the pilot burner is ignited by opening the main valve, the water flows to the heat exchanger by opening the water valve, and the water flow accompanying the water flow is performed. In the case where the ignition of the main burner from the pilot burner is sequentially applied by opening the gas valve, the water valve is activated by a detection signal from a flame detector that detects the ignition of the pilot burner. The valve is configured to open, that is, water is allowed to flow through the heat exchanger,
In addition, after confirming the ignition of the pilot burner, gas is supplied to the main burner, so there is no dry firing of the heat exchanger, and no raw gas is released from the main burner, and the pilot burner can be ignited. Then, the operation during the hot water tapping operation, which passes water through the heat exchanger and ignites the main burner, can be performed with a relatively weak operating force required to turn on and off the operating switch, so-called feather touch operating force, This has the effect of improving operability compared to the conventional heart cam mechanism which requires a relatively strong operating force to move the engager within the cam groove.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one example of the implementation of the present invention, and FIG. 2 is an explanatory diagram of an application of the embodiment of FIG. 1... Main burner, 2... Pilot burner, 3...
...Heat exchanger, 4...Gas supply path, 5...Solenoid on-off valve (main valve), 6...Hydraulic pressure response valve (gas valve), 7...
Pilot gas passage, 8... Water passage, 9... Solenoid on-off valve (water valve), 12... Flame rod (flame detector), 16... Contact type switch (operation switch).

Claims (1)

[Claims] 1. A water valve is installed in the water passage connected to the heat exchanger, a main valve is installed in the gas supply path connected to the main burner that heats the heat exchanger, and a gas valve is installed downstream of the main valve in the gas supply path. A pilot gas passage is provided which is branched from the middle between the main valve and the gas valve of the gas supply path and connected to the pilot burner, and the pilot burner is ignited by opening the main valve, and the water valve is ignited. The hot water tapping operation is performed by sequentially applying water to the heat exchanger by opening the valve and igniting the main burner from the pilot burner by opening the gas valve accompanying the water flow. In such a device, the main valve is configured to be opened by being energized by operation of an operating switch, and the water valve is configured to be opened by a detection signal from a flame detector that detects ignition of the pilot burner. A water heater characterized by comprising: