KR0181630B1 - Combustor - Google Patents

Abstract

The present invention is to provide a combustion device excellent in safety without ignition operation when the temperature fuse is cut off due to overheating, as a means to solve this, the water flow switch (4) and the temperature fuse that is 'on' when the water flow is detected (42) is electrically connected in series, and if the temperature fuse 42 is cut off due to overheating, the voltage ( _Vcc2 ) is not applied to the regulator 91 even when the water flow switch 4 is turned 'on'. The stabilization voltage V _REG as a signal and an operating power is not supplied to the suction timer circuit 6, the holding timer circuit 7, the igniter timer circuit 51, and the stabilization voltage V _REG as the operating power. The structure which does not supply these transistors 13 and 14 was taken.

Description

Combustion device

1 is an external view of a gas instantaneous water heater according to an embodiment of the present invention.

2 is a configuration diagram of the gas instantaneous water heater.

3 is an electrical connection diagram of the gas pure water heater.

4 is a flowchart showing the operation of the gas instantaneous water heater.

5 is a flowchart showing the operation of the gas instantaneous water heater.

6 is a time chart showing the operation of the gas instantaneous water heater.

* Explanation of symbols for main parts of the drawings

A: Gas instantaneous water heater (combustion device)

1: Electronic safety valve (solenoid valve) 2 gas burner

3: 4 water flow switch with heat exchanger

6: suction timer circuit 7 holding timer circuit

8: Ignition detection circuit (safety circuit)

14: transistor (switch element)

21: gas pipe (gas supply passage) 31: heat exchanger (heat exchange unit)

41: contact 42: temperature fuse

51: igniter timer circuit (ignition timer circuit)

52: ignitor driving circuit (ignition circuit)

61: ON signal 71: ON signal

92: battery 511: operation signal (ignition signal)

Vcc2: Voltage (ignition indication signal, operating power)

V _REG : Stabilization voltage (ignition indication signal, operating power)

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a combustion apparatus.

[Prior art]

As a combustion apparatus, for example, in a gas water heater, a solenoid valve is provided in the middle of a gas supply path to a gas burner. Moreover, as an ignition means of a gas burner, the ignition apparatus which generate | occur | produces a high voltage and flame-discharges by electricity supply, for example is known. The solenoid valve and the ignition device are connected to a DC power source (for example, a battery) through a transistor, and when the ON signal is input to the transistor, the solenoid valve and the ignition device are energized.

Specifically, when the water flow switch that detects the water flow is 'on', the transistor controlling the energization of the solenoid valve or the ignition device according to the 'on' signal (ignition signal) for a predetermined time (for example, 5 seconds). The holding timer circuit and the ignition timer circuit which send out an "on" signal are connected.

In order to prevent overheating of the heat exchanger, a temperature fuse electrically connected between the transistor and the solenoid valve may be installed near the heat exchanger.

[Problems that the invention tries to solve]

In the gas water heater, since the holding current does not flow in the solenoid valve once the temperature fuse is cut off, the user cannot use the gas water heater until the serviceman finds out the cause of overheating and replaces the temperature fuse.

However, even in such a state, since the ignition circuit is operable and the spark discharge is performed, the user may erroneously know that the gas water heater is not broken and perform the ignition operation again and again.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combustion device that is excellent in safety because a normal ignition operation is not performed when a temperature fuse is blown for overheating.

[Means for solving the problem]

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention employ | adopted the following structures. (1) a solenoid valve which is installed in the middle of a gas supply path for supplying gas to a gas burner and opens the valve body by energization, and a temperature fuse which is installed at a place heated by the combustion of the gas burner and cuts off at a predetermined temperature or more; A holding circuit for forcibly energizing the solenoid valve for a predetermined time from the input of the ignition instruction signal, an ignition circuit for starting the ignition operation by input of the ignition instruction signal, and detection of a combustion flame by input of the ignition instruction signal. In the combustion apparatus including the safety circuit which starts and energizes the said solenoid valve while a combustion flame is detected, the said ignition instruction signal is input through the said temperature fuse.

(2) It has the structure of said (1), and the said ignition instruction signal has the electric power for the operation of the said holding circuit and the said safety circuit.

(3) detects a heat exchange water passage having a solenoid valve which is installed in the middle of a gas supply passage for supplying gas to the gas burner, the valve body being opened by energization, a heat exchange portion heated by the gas burner, and a flow of water flowing through the heat exchange passage A water flow switch in which a bottom contact is closed, a temperature fuse installed near the heat exchange unit and disconnected at a predetermined temperature or more, a power supply line for operating power supplied from the battery through the water flow switch and the temperature fuse; An ignition timer circuit which is connected between the solenoid valve and the switch element, and an ignition timer which outputs an ignition signal for a predetermined time when the operation power connected to the operation power supply line is supplied; Connected to the ignition circuit and the operation power supply line, and when the operation power is supplied, It is connected to the holding timer circuit and the power supply line for the operation to send the 'on' signal to the switch element, and the detection of the combustion flame when the operating power is supplied, the switch while the combustion flame is detected The device is equipped with a safety circuit that sends an 'on' signal.

[Claim 1]

Ignition instruction signal is input to each circuit through temperature fuse.

The ignition circuit starts the ignition operation.

The holding circuit keeps the solenoid valve open by energizing the solenoid valve for a predetermined time.

When the gas burner is ignited and the safety circuit detects a combustion flame during a predetermined time, the safety circuit continues to energize the solenoid valve even after the predetermined time has elapsed, the solenoid valve remains open, and the gas burner continues combustion.

When the temperature fuse is cut off due to overheating, even if the ignition indication signal is output, it is not input to each circuit.

For this reason, the ignition circuit does not start the ignition operation, the holding circuit does not energize the solenoid valve, the solenoid valve is kept closed, and the safety circuit does not start the detection of combustion flames, and the gas burner is in a fire extinguishing state. Keep it.

[Claim 2]

The ignition indication signal is input to each circuit through the temperature fuse.

The ignition circuit starts the ignition operation.

The holding circuit energizes the solenoid valve for a predetermined time, thereby keeping the solenoid valve open.

When the gas burner ignites and the safety circuit detects a combustion flame during a predetermined time, the safety circuit continues to energize the electronic valve after a predetermined time elapses, the electronic valve remains open, and the gas burner continues combustion.

When the temperature fuse is cut off due to overheating, even if the ignition indication signal is output, it is not input to each circuit. In addition, the operating circuit is not supplied to the holding circuit and the safety circuit.

For this reason, the ignition circuit does not start the ignition operation, the holding circuit does not energize the solenoid valve, the solenoid valve maintains the closed state, and the safety circuit does not start detection of the combustion flame, so the gas burner maintains the extinguishing state. do.

[Claim 3]

When water flows in the heat exchange water channel, the contact point of the water flow switch is closed, and the working power line is supplied with the working power from the battery through the water flow switch and the temperature fuse.

The ignition timer circuit connected to the operation power supply line sends out the ignition signal for a predetermined time, and the ignition circuit performs the ignition operation while the ignition signal is being input.

The holding timer circuit connected to the operation power line sends an 'on' signal to the switch element for a predetermined time and the switch element is 'on' so that the solenoid valve is kept open.

When the safety circuit connected to the operation power line detects a combustion flame during a predetermined time, the on-signal signal is started to be sent to the switch element. After a predetermined time, the solenoid valve remains open and the gas burner continues to burn.

If the temperature fuse is cut off due to overheating, even though the contact of the water flow switch is closed due to the water flowing in the heat exchange channel, the operating power line is not supplied with the operating power line.

Because of this, no operating power is supplied to the switch element, the holding timer circuit and the safety circuit. In addition, the ignition timer circuit does not send the ignition signal, the telephone circuit does not perform the ignition operation, the maintenance timer circuit does not send the 'on' signal to the switch element, and the safety circuit does not start the detection of the combustion flame, The valve remains closed and the gas burner remains extinguished.

[Effects of the Invention]

[About old paragraph 1]

Since the ignition instruction signal is input to the holding circuit, the ignition circuit, and the safety circuit through the temperature fuse, if the temperature fuse is cut off due to overheating, the ignition instruction signal is not input to each circuit even though the ignition instruction signal is output.

Therefore, when the temperature fuse is cut off due to overheating, the ignition circuit does not start the ignition operation even if the user performs the ignition operation, the holding circuit does not energize the solenoid valve, and the safety circuit does not start detection of the combustion flame. The solenoid valve is kept closed, and the gas burner is kept extinguished.

That is, when the temperature fuse is cut off, the ignition operation is not performed even if the user performs the ignition operation. Because of this, it is excellent in safety and can notify the user that the combustion device has failed, so that the repair request can be assured.

[Claim 2]

Since the ignition instruction signal is input to the holding circuit, the ignition circuit, and the safety circuit through the temperature fuse, if the temperature fuse is cut off due to overheating, the ignition instruction signal is not input to each circuit even if the ignition instruction signal is output. In addition, the operating power is not supplied to the holding circuit and the safety circuit.

For this reason, if the temperature fuse is cut off due to overheating, the ignition circuit does not start the ignition operation even if the user performs the ignition operation, the holding circuit is stopped, and the solenoid valve is not energized, and the safety circuit is stopped. No flame detection is started, the solenoid valve remains closed and the gas burner remains extinguished.

That is, when the temperature fuse is cut off, the ignition operation is not performed even if the user performs the ignition operation. This ensures excellent safety and also alerts the user that a combustion device has failed, so that repairs can be assured.

[Claim 3]

The temperature fuse is electrically connected in series with the water flow switch, and the operating power from the battery is supplied to the power supply line through the water flow switch and the temperature fuse. A switch element, an ignition timer circuit, a holding timer circuit and a safety circuit are connected to the operation power supply line.

When the temperature fuse is cut off due to overheating, the operating power is not supplied to the operating power line.

In this case, even if the contact of the water flow switch is closed by flowing water to the heat exchange channel, the operating power is not supplied to the switch element, the ignition timer circuit, the maintenance timer circuit, and the safety circuit, and the ignition circuit does not perform ignition operation. (Ignition signal is not input from the ignition timer circuit.)

That is, when the temperature fuse is cut off, the ignition operation is not performed even if the user ignites the operation and sends water to the heat exchange water passage. Because of this, it is excellent in safety and can notify the user that the combustion device has failed, so that the repair request can be assured.

EXAMPLE

An embodiment (claims 1 to 3) of the present invention will be described with reference to FIGS. 1 to 6.

As shown in the figure, the gas instantaneous water heater (A) has a suction coil (11) and a holding coil (12), and an electronic safety valve (1) installed in a gas pipe (21) for supplying gas to the gas burner (2); , The heat exchange water passage 3 having the transistors 13 and 14, the heat exchanger 31, the water flow switch 4 which closes the contact 41 when the water flow is detected, and the temperature fuse which is cut off when the overheat is detected. 42), the igniter timer circuit 51 and the igniter driver circuit 52, and the suction timer circuit 6 for transmitting the 'on' signal 61 during the first timer time (0.4 seconds) when the contact 41 is closed. When the contact 41 is closed, the holding timer circuit 7 transmits the 'on' signal 71 for the second timer time (5.5) seconds, and when the contact 41 is closed, combustion failure detection is started and combustion failure is stopped. An ignition detection circuit 8 is provided which sends an 'on' signal 81 to the transistor 14 while being detected.

91 is a regulator. When the contact 41 is closed, a voltage (V _cc2 ; 3 V) is applied to the IN terminal 910 and a stabilization voltage (V _REG ; 1.5 V) is applied to the OUT terminal 911. Is generated.

92 is a battery, and in this embodiment, two single-type 1.5V manganese batteries are connected in series to generate an electromotive force of a voltage (V _cc1 ; 3V).

9 is an electronic unit, and each circuit is organized.

The electromagnetic safety valve 1 has a suction coil 11 (3.7 kPa) in which the valve body is opened by energization, and a retaining coil 12 (500 kPa) for maintaining the open state even after suction by the energization. Install at the highest level.

The gas burner 2 is installed below the heat exchanger 31, and gas is supplied and combusted by the gas pipe 21. The gas pipe 21 is provided with a hydraulic automatic gas valve 212 and a capacity regulator 213 connected to the electromagnetic safety valve 1, the gas governor valve 211, the water governor 323 from the upstream side.

The combustion body near the heat exchanger 31 is provided with a temperature fuse 42 which is cut off at 152 占 폚 or higher. One end of the temperature fuse 42 is electrically connected to the water flow switch 4, and the other end thereof is electrically connected to the in terminal 910.

The hydraulic automatic gas valve 212 is connected to the water governor 323 by an interlocking rod 43 and is closed when water flows in the heat exchange water passage 3.

The capacity controller 213 is connected to the capacity adjustment control unit 214, and passes the gas by an amount corresponding to the slide amount of the capacity control operation unit 214.

The heat exchange water path 3 is configured by sequentially installing a water supply pipe 32, a heat exchanger 31, and a tapping pipe 33.

The water supply pipe 32 is provided with a hot water supply regulator (325) connected to the hot water supply (not shown), the water filter 321, the water governor 323, and the hot water temperature control operation unit 324.

The water flow switch 4 is inserted between the battery 92 and the temperature fuse 42 and connected to the interlocking rod 43 connecting the water governor 323 and the hydraulic gas valve 212. The contact 41 is closed. In addition, the output side of the water flow switch 4 is the power supply line R for operation.

The igniter timer circuit 51 transmits the operation signal 511 to the igniter drive circuit 52 for 5.5 second from the electric power supply start by closing of the leopard 41. FIG.

The igniter drive circuit 52 generates a high voltage for spark discharge while the operation signal 511 is input, and applies a high voltage for ignition to the ignition electrode 521 provided toward the gas burner 2. . In addition, since the igniter drive circuit 52 consumes a relatively large amount of current, the voltage V _cc1 is used as the operating power.

The ignition detection circuit 8 detects the flame current by applying an alternating current voltage (about 100 V) to the flame rod 80 provided toward the gas burner 2 to detect the flame current. (Ignition is detected.) The 'on' signal 81 is sent to the transistor 14. In addition, the voltage _Vcc2 is used as the operating power.

The suction timer circuit 6 is composed of a comparator, a CR charging circuit, and the like. When the stabilization voltage V _REG is supplied as a timer start signal, the first timer time (for 0.4 seconds) and the ON signal 61 ) Is sent to the transistor 13.

The transistor 13 is provided between the suction coil 11 and the battery 92, conducts while the ON signal 61 is being input, and conducts a suction current to the suction coil 11.

The holding timer circuit 7 is composed of a comparator, a CR charging circuit, and the like. When the stabilization voltage V is supplied as a timer operation start signal, a second timer time (for 5.5 seconds) is sent out to the transistor 14. do.

The transistor 14 is provided between the holding coil 12 and the out terminal 911 and conducts to the holding coil 12 while conducting while the 'on' signal 71 or the 'on' signal 81 is being input. The holding current flows to keep the electromagnetic safety valve 1 open.

Next, the operation of the gas instantaneous water heater A will be described based on the flowcharts of FIGS. 4 and 5 and the timer chart of FIG.

Beginning of instrument use (see Fig. 4)

When the user opens the hot water supply (step s1), the water flow switch 4 closes (step s2), the voltage V _cc2 is supplied to the in terminal 910 of the regulator 91, and stabilized at the out terminal 911. The voltage V _REG is generated.

By the start of the power supply stabilizing voltage (V _REG) it is made of more than feed in step s3.

The igniter timer circuit 51 sends the operation signal 511 to the igniter driver circuit 52, and the igniter driver circuit 52 applies a high voltage to the ignition electrode 521, and spark discharge is started. The suction timer circuit 6 transmits an 'on' signal 61 to the transistor 13, and the transistor 13 conducts and flows a suction current to the suction coil 11, so that the electronic safety valve 1 is opened. do. The holding timer circuit 7 sends an 'on' signal 71 to the transistor 14, and the transistor 14 conducts a current to the holding coil 12.

In step s4, the hydraulic automatic gas valve 212 is opened, and the gas burner 2 is ignited.

When 0.4 second has elapsed from the start of the 'on' of the water flow switch 4 (YES in step s5), the suction timer circuit 6 does not transmit the 'on' signal 61 to the transistor 13, and the transistor ( 13) 'off' so that the suction current does not flow through the suction coil 11 (step s6).

When 5.5 seconds have elapsed since the start of the water flow switch 4 (YES in step s7), the holding timer circuit 7 does not send the 'on' signal 71 to the transistor 14, and thus the igniter timer circuit. (51) does not send the operation signal 511 to the igniter drive circuit 52, and flame discharge stops (step s8).

As shown in Fig. 6A, in the normal case, the ignition detection circuit 8 has already detected the spark current and has sent the 'on' signal 81 to the transistor 14 (in step S9). YES) The maintenance of the electromagnetic safety valve 1 is continued.

If the voltage V _cc1 is 1.8 V or more (YES in step S10) and a spark current is detected, the hot water supply is continued until the use of the instrument is stopped.

When the flame current is not detected (incombustibility; FIG. 6 (b)), when the flame current is not detected (fire); (C) of FIG. 6 or when the voltage _Vcc1 is less than 1.8 V (voltage drop; (d) of FIG. 6), the confirmation lamp 93 continuously lights and the ignition detection circuit 8 The transmission of the 'on' signal 81 to the transistor 14 is stopped. (Step s11) The electronic safety valve 1 is thereby closed.

If the user feels an abnormality and closes the hot water supply valve (step s12), the water does not flow, so the automatic hydraulic gas valve 212 is closed (step s13), the water flow switch 4 is 'off' and the confirmation lamp 93 It lights (step s14).

Stop using the instrument (See Fig. 5)

When the user closes the hot water valve to stop the use (step s1), the water does not flow, so the hydraulic automatic gas valve 212 is closed (step s2), the gas burner 2 is extinguished (step s3), and the water flow switch (4) is turned off (step s4), and the solenoid safety valve 1 is closed (step s5).

When the temperature fuse 42 is broken

As shown in (e) of FIG. 6, when the user opens the hot water supply, water flows, and the water flow switch 4 turns on, but since the temperature fuse 42 is cut off, the terminal 910 of the regulator 91 is connected. The voltage V _cc2 is not applied, and the stabilization voltage V _REG is not output to the out terminal 911.

Therefore, the stabilization voltage V _REG is not supplied to the transistor 14, the suction timer circuit 6, the holding timer circuit 7, and the igniter timer circuit 51, and the voltage V _cc2 is supplied to the ignition detection circuit 8. ) Does not feed.

In addition, the suction timer circuit 6 does not send the ON signal 61 to the transistor 13, the igniter timer 51 does not send the ignition signal 511, and the holding timer circuit 7 Without transmitting the 'on' signal 71 to the transistor 14, the ignition detection circuit 8 does not start detection of the combustion flame and the electronic safety valve 1 remains closed so that the gas burner 2 Maintain digestion.

Gas instantaneous water heater (A) has the advantages of (a)-(d) by the following configuration and operation.

The temperature fuse 42 has one end electrically connected to the water flow switch 4, and the other end is electrically connected to the in terminal 910 of the regulator 91 (in series with the water flow switch 4).

When the temperature fuse 42 is blown, the transistor 14, even if the user performs an ignition operation (opens a hot water supply and flows water into the heat exchanger channel 3) to close the contact 41 of the water flow switch 4; The stabilization voltage V _REG is not supplied to the suction timer circuit 6, the sustain timer circuit 7, and the igniter timer circuit 51, and the voltage V _cc2 is not supplied to the ignition detection circuit 8.

(A) When the temperature fuse 42 is cut off, even if the user performs an ignition operation, the suction current does not flow and the gas is not released, so it is safe.

(B) When the user performs ignition operation when the temperature fuse 42 is cut off, no spark discharge (sound of 'muddy') occurs, and the confirmation lamp 93 does not light up, and the operation or display in normal operation is performed. Therefore, the user can easily know that the gas water heater is broken.

(C) When the temperature fuse 42 is cut off, the user knows that the battery is broken and stops using it, thereby preventing the battery from being consumed and promptly requesting repair.

(D) Since the power supply for operating the igniter driving circuit 52 and the transistor 13 (large current flows) does not pass through the temperature fuse 42 or the water flow switch 4, the contact 41 is welded. It is possible to prevent the thermal fuse 42 from being disconnected due to contact failure or a large current.

In the above embodiment, the suction valve and the retaining coil are separately provided as solenoid valves, but a single coil may serve as suction and retention. Alternatively, although the water heater is shown as a combustion device in the above embodiment, it may be applied to other combustion devices such as a fan heater.

Claims (3)

The solenoid valve which is installed in the middle of the gas supply passage for supplying gas to the gas burner and opens the valve body by energization, the temperature fuse which is installed at the place heated by the combustion of the gas burner and cuts out at a predetermined temperature, and the ignition indication signal A holding circuit for forcibly communicating the solenoid valve for a predetermined time from the input of the ignition circuit, an ignition circuit which starts the ignition operation by the input of the ignition instruction signal, and the detection of the combustion flame by the input of the ignition instruction signal, A combustion apparatus comprising a safety circuit for energizing the solenoid valve while a flame is detected, wherein the ignition instruction signal is input through the temperature fuse. The combustion device according to claim 1, wherein said ignition command signal also serves as an electric power for operating said holding circuit and said safety circuit. It is installed in the middle of the gas supply passage for supplying gas to the gas burner, and the contact is closed when the water flow flowing through the heat exchange channel and the heat exchange passage having the solenoid valve that the valve body is heated by the energization, the heat exchanger is heated by the gas burner A water flow switch, a temperature fuse installed in the vicinity of the heat exchanger and disconnected at a predetermined temperature or more, a power supply line for operating power supplied from the battery through the water flow switch and the temperature fuse, and the solenoid valve An ignition timer circuit which is connected between the switching element, the activating power line, and which supplies an ignition signal for a predetermined time when the motive power is supplied, and an ignition circuit which performs an ignition operation while the ignition signal is input; Connected to the operation power supply line, and when the operation power is supplied, forcibly A holding timer circuit for sending an 'ON' signal to a switch element, and connected to the operation power line, and when operation power is supplied, detection of a combustion flame is initiated, while the combustion flame is detected; Combustion apparatus provided with a safety circuit which sends an "on" signal to a switch element.