JP3303584B2 - Combustion device inspection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device inspection method for inspecting the operation of equipment provided in a combustion device.

[0002]

2. Description of the Related Art Conventionally, a safety device employed in a combustion device such as a hot water supply device monitors a state of energization of a coil of a relay as a switch means for energizing a solenoid of an electromagnetic valve for opening and closing a gas flow path. Then, when an abnormality occurs, the current supply to the coil is cut off.

[0003]

However, in the above-described conventional configuration, if the relay contacts are kept closed due to welding or the like, the solenoid of the solenoid valve is always connected to the solenoid even if the current to the coil is cut off. As a result, power was supplied and unburned fuel gas might leak.

When the solenoid valve is provided in a plurality of stages in the gas flow path, the above possibility is reduced, but when the contacts of the plurality of relays are welded, unburned fuel gas may leak. , The possibility could not be avoided enough.

Therefore, the inventors of the present invention provided common switch means for directly shutting off the power supply to the solenoid of the solenoid valve, separately from the switch means, and monitored the power supply to the solenoid of the solenoid valve. When the solenoid of the solenoid valve is energized when the solenoid valve should be closed, the safety device in the combustion device is configured so as to cut off the energization of the solenoid of the solenoid valve by the common switch means. .

[0006] However, in order for such a safety device to operate properly, it is necessary that the main devices of the safety device operate normally. It is very convenient to prevent leakage of fuel gas.

The present invention has been proposed in view of the above points, and provides a method of inspecting a combustion apparatus, which can automatically inspect the operation of a safety device for preventing leakage of unburned fuel. That is its purpose.

[0008]

Means for Solving the Problems To solve the above problems, the present invention takes the following technical means.

That is, according to the invention described in claim 1 of the present application, the power supply to the solenoid valve, which is interposed between the power supply and the solenoid valve that opens and closes the flow path for supplying fuel to the burner, is normally performed. Combustion provided with common switch means different from the switch means for controlling, a signal transmission device for transmitting signals on the input side and the output side, and electromagnetic valve monitoring means for detecting that the electromagnetic valve is energized. in the apparatus, there is provided an inspection method of a combustion apparatus for inspecting a failure of the signal transmitting device and the switch means and the common switching means, without turning on the switch means and the common switching means, the output of the solenoid valve monitoring unit is on If so, the signal transmission device ON failure determination step of determining that the output is always on due to the failure of the signal transmission device, and turning on the common switch means without turning on the switch means, If the output of the viewing means is on,
A switch means ON failure determination step of determining that the switch means is always closed due to a failure of the switch means , and if the output of the solenoid valve monitoring means is ON without turning on the common switch means, A common switch means on failure determination step of determining that the common switch means is always closed due to a failure of the common switch means is executed in an arbitrary order.

The invention described in claim 2 of the present application is
Switch means interposed between a solenoid of a solenoid valve for opening and closing a flow path for supplying fuel to the burner and a DC power supply; common switch means interposed between the switch means and the DC power supply; A combustion device comprising: a photocoupler having an input side connected to a DC power supply via a switch means and a common switch means; and a solenoid valve monitoring circuit for outputting a high-level signal when a solenoid of the solenoid valve is energized. In the method of inspecting a combustion device for inspecting the failure of the photocoupler, switch means and common switch means,
If the switch means and the common switch means are not turned on before the burner is ignited and the output of the solenoid valve monitoring circuit is at a high level, it is determined that the output is always on due to a photocoupler failure. A decision step;
Without turning on the switch means, turning on the common switch means, and if the output of the solenoid valve monitoring circuit is at a high level, a switch means on failure judgment step of judging that the switch means is always closed due to a failure of the switch means; , Without turning on the common switch means, turning on the switch means,
If the output of the solenoid valve monitoring circuit is at a high level, the common switch means is determined to be always closed due to the failure of the common switch means. If the output is low level, a photo coupler off failure determination step of determining that the output is always off due to a photo coupler failure is executed.

Further, the invention described in claim 3 of the present application is:
A source relay contact interposed between a DC solenoid and a solenoid of a source solenoid valve that opens and closes a source gas flow path for supplying fuel gas to a hot water supply burner and a bath burner, and a branch from the source gas flow path A hot water supply relay contact interposed between the solenoid of the hot water supply solenoid valve for opening and closing the hot water supply gas flow path for supplying the fuel gas to the hot water supply burner and the DC power supply, and a branch from the original gas flow path A bath relay contact that is interposed between a solenoid of a bath solenoid valve for opening and closing a bath gas flow path for supplying fuel gas to a bath burner and a DC power supply, a base relay contact, and hot water supply A common relay contact interposed between all of the relay contacts for bath and bath and the DC power supply, and a second relay whose input side is connected to the DC power supply via the relay contact for hot water supply and the relay contact for common. Equipped with 1 photocoupler for hot water supply A hot water supply solenoid valve monitoring circuit that outputs a high level signal when a solenoid of a magnetic valve is energized, and a second photocoupler whose input side is connected to a DC power supply via a bath relay contact and a common relay contact Based on a detection signal from a bath electromagnetic valve monitoring circuit that outputs a high-level signal when the solenoid of the bath electromagnetic valve is energized, and a detection signal from a hot water supply frame rod that detects the flame of the hot water supply burner, Based on the detection signal from the hot water supply flame detection circuit that outputs a high-level signal when the hot water supply burner flame is not detected, and the detection signal from the bath flame rod that detects the bath burner flame, the flame of the bath burner is detected. A bath flame detection circuit that outputs a high-level signal when it is not detected, and hot-water supply water that detects the amount of water supplied to a hot-water supply heat exchanger heated by a hot-water supply burner A hot-water supply detection circuit that outputs a high-level signal when water is not passed through the hot-water supply heat exchanger based on a detection signal from the sensor, and a bath heat exchanger that is heated by a bath burner A bath water flow detection circuit that outputs a high-level signal when water is not passed through the bath heat exchanger based on a detection signal from a water flow switch that detects the flow of water, and a flame detection circuit for hot water supply AND circuit that outputs a logical product of the output signal of the hot water supply solenoid valve monitoring circuit and the output signal of the hot water supply solenoid valve monitoring circuit. A second AND circuit that outputs a product, a third AND circuit that outputs a logical product of an output signal of the bath flame detection circuit and an output signal of the bath solenoid valve monitoring circuit, and a detection of water flow in the bath. Between the output signal of the circuit and the output signal of the bath solenoid valve monitoring circuit A fourth AND circuit that outputs a logical product;
A logical sum circuit that outputs a logical sum of outputs of the logical product circuit of
A timer circuit that outputs a high-level signal when the output of the OR circuit continues to be at a high level for a predetermined time;
A first and second photocoupler, a hot water supply relay contact and a bath relay contact in a combustion device having a common relay off circuit for opening a common relay contact when the timer circuit outputs a high level signal. A method of inspecting a combustion device for inspecting a failure between a hot water supply relay contact and a hot water supply burner before ignition of a hot water supply burner and after water flow is detected by a hot water supply water amount sensor. If the output of the hot water supply solenoid valve monitoring circuit is at a high level without energizing the drive coil with the common relay contact, it is determined that the output is always on due to the failure of the first photocoupler. The hot water supply solenoid valve monitoring circuit energizes the drive coil of the common relay contact without energizing the drive coil of the hot water relay contact. If the output is at a high level, the hot water supply relay contact on failure determination step for determining that the relay is always closed due to the failure of the hot water supply relay contact, and the hot water supply relay without energizing the drive coil of the common relay contact If the drive coil of the contact is energized and the output of the hot water supply electromagnetic valve monitoring circuit is at a high level, a common relay contact ON failure determining step of determining that the relay is always closed due to the failure of the common relay contact. If the output of the hot water supply electromagnetic valve monitoring circuit is low after the execution and the ignition of the hot water supply burner, it is determined that the output is always off due to the failure of the first photocoupler. Steps are executed, after the hot water burner is extinguished and after the flow of water is no longer detected by the hot water supply amount sensor, the main relay contact, the hot water relay contact, and the bath relay connection are performed. If the output of the hot water supply solenoid valve monitoring circuit is at a high level without energizing the drive coil, it is determined that the output is always on due to the failure of the first photocoupler. Execute the judgment step, and do not energize the drive coil between the bath relay contact and the common relay contact before the bath burner is ignited and after the water flow is detected by the water flow switch during bath reheating. If the output of the bath solenoid valve monitoring circuit is at a high level, a first ascending second photocoupler on failure determining step of determining that the output is always on due to a failure of the second photocoupler; If the drive coil of the common relay contact is energized without energizing the drive coil and the output of the bath solenoid valve monitoring circuit is at a high level, it is always closed due to the failure of the bath relay contact. Bath relay contact ON failure judgment step to judge that the drive coil of the common relay contact is not energized,
If the drive coil of the bath relay contact is energized and the output of the bath solenoid valve monitoring circuit is at a high level, it is determined that the relay for the common is always closed due to the failure of the relay contact for the common. Executing the steps, if the output of the bath solenoid valve monitoring circuit is at a low level after the ignition of the bath burner, the second photocoupler determines that the output is always off due to the failure of the second photocoupler Execute the OFF failure judgment step, and after the fire of the bath burner has been extinguished and after the passage of water has stopped detecting water, the drive coil between the main relay contact, hot water supply relay contact and bath relay contact is energized. On the other hand, if the output of the bath solenoid valve monitoring circuit is at a high level, it is determined that the output is always on due to the failure of the second photocoupler. It is characterized by performing the steps.

[0012]

According to the first aspect of the present invention, in the signal transmission device ON failure determination step, the switch means is provided.
If the output of the solenoid valve monitoring means is on without turning on the common switch means and the common switch means , it is determined that the output is always on due to the failure of the signal transmission device. In the switch means on failure determination step, the common switch means is turned on without turning on the switch means, and if the output of the solenoid valve monitoring means is on, it is determined that the switch means is always closed due to the failure of the switch means. I do. In the common switch means on failure determination step, the common switch means is not turned on, the switch means is turned on, and if the output of the solenoid valve monitoring means is on, the common switch means is always closed due to a failure. Judge.

That is, in the signal transmission device on failure determination step, the switch means and the common switch means are not turned on, so that the output of the solenoid valve monitoring means must be off, and the output of the solenoid valve monitoring means must be off. Is ON, it can be determined that the output is always ON due to the failure of the signal transmission device. In the switch means ON failure determination step,
Since the common switch means is turned on without turning on the switch means, if the switch means is not opened, the output of the solenoid valve monitoring means is turned on, and in this case, the switch means is always closed due to a failure of the switch means. I can judge. In the common switch means on failure determination step, the switch means is turned on without turning on the common switch means. Therefore, if the common switch means is not opened, the output of the solenoid valve monitoring means is turned on. It can be determined that the switch is always closed due to the failure of the switch means.

According to the second aspect of the present invention, before the burner is ignited, the photocoupler on failure determination step, the switch means on failure determination step, and the common switch means on failure determination step are executed. . In the photo coupler on failure determination step, if the output of the solenoid valve monitoring circuit is at a high level without turning on the switch means and the common switch means, it is determined that the output is always on due to the failure of the photo coupler. In the switch means on failure determination step, the common switch means is turned on without turning on the switch means, and if the output of the solenoid valve monitoring circuit is at a high level, it is determined that the switch means is always closed due to a failure. to decide. In the common switch means on failure determination step, the common switch means is not turned on, the switch means is turned on, and if the output of the solenoid valve monitoring circuit is at a high level, the common switch means is always closed due to the failure of the common switch means. Judge that there is. If the output of the solenoid valve monitoring circuit is at a low level after the ignition of the burner, it is determined that the output is always off due to a failure of the photocoupler.

That is, in the photo coupler on failure determination step, since the switch means and the common switch means are not turned on, the output of the solenoid valve monitoring circuit should be low and the output of the solenoid valve monitoring circuit should be high. For example, it can be determined that the output is always on due to a photocoupler failure. In the switch means ON failure judgment step, the common switch means is turned on without turning on the switch means. Therefore, if the switch means is not opened, the output of the solenoid valve monitoring circuit becomes a high level. It can be determined that it is always closed due to the failure of. In the common switch means failure determination step, the switch means is turned on without turning on the common switch means. Therefore, if the common switch means is not opened, the output of the solenoid valve monitoring circuit becomes a high level. It can be determined that the switch is always closed due to the failure of the switch means. In the photo coupler off failure determination step, the output of the solenoid valve monitoring circuit should be at a high level because the burner has been ignited, and if the output of the solenoid valve monitoring circuit is at a low level, the output due to a photo coupler failure will occur. It can be determined that it is always off.

According to the third aspect of the present invention, at the time of hot water supply, before the hot water supply burner is ignited and after the flow of water is detected by the hot water supply water amount sensor, the first first photocoupler failure occurs. A determination step, a relay contact on failure determination step for hot water supply, and a relay contact on failure determination step for common are executed. In the first first photocoupler on failure determination step, if the drive coil of the hot water supply relay contact and the common relay contact is not energized and the output of the hot water supply solenoid valve monitoring circuit is at a high level, the first It is determined that the output is always on due to a photocoupler failure. In the hot water relay contact ON failure determination step, the drive coil of the common relay contact is energized without energizing the drive coil of the hot water relay contact, and the output of the hot water solenoid valve monitoring circuit is at a high level. It is determined that the relay is always closed due to the failure of the hot water supply relay contact. In the common relay contact on failure determination step, if the drive coil of the hot water relay contact is energized without energizing the drive coil of the common relay contact and the output of the hot water supply solenoid valve monitoring circuit is at a high level, It is determined that the relay is always closed due to the failure of the common relay contact. Then, after the hot water supply burner is ignited, if the output of the hot water supply solenoid valve monitoring circuit is at a low level in the first photo coupler off failure determination step, it is determined that the output is always off due to the failure of the first photo coupler. to decide. Further, after extinguishing the hot water supply burner and after the flow of water is no longer detected by the hot water supply water amount sensor, in the second first photocoupler on failure determination step, the original relay contact, the hot water supply relay contact, and the bath relay contact If the output of the hot water supply solenoid valve monitoring circuit is at a high level without energizing the drive coil, it is determined that the output is always on due to the failure of the first photocoupler.

In addition, at the time of additional bathing, before the ignition of the bath burner and after the passage of water by the water passage switch is detected, a first ascending second photocoupler on failure determining step is provided;
A bath relay contact ON failure determination step and a common relay contact ON failure determination step are executed. In the first assortment 2 photocoupler on failure determination step, if the output of the bath solenoid valve monitoring circuit is at a high level without energizing the drive coil between the bath relay contact and the common relay contact, the second It is determined that the output is always on due to a photocoupler failure. In the bath relay contact on failure determination step, if the drive coil of the common relay contact is energized without energizing the drive coil of the bath relay contact and the output of the bath solenoid valve monitoring circuit is at a high level, It is determined that it is always closed due to the failure of the bath relay contact. In the common relay contact on failure determination step, if the drive coil of the bath relay contact is energized without energizing the drive coil of the common relay contact and the output of the bath solenoid valve monitoring circuit is at a high level, Is determined to be always closed due to the failure of the common relay contact. Then, after ignition of the bath burner, the second
If the output of the bath solenoid valve monitoring circuit is at a low level in the photocoupler off failure determining step, it is determined that the output is always off due to the failure of the second photocoupler. Further, after the bath burner is extinguished and after the passage of water is no longer detected by the passage switch, the second relay 2 photocoupler-on failure determining step includes the relay relay for the main unit, the relay contact for the hot water supply, and the relay contact for the bath. If the output of the bath solenoid valve monitoring circuit is at a high level without energizing the drive coil of, it is determined that the output is always on due to the failure of the second photocoupler.

That is, in the first first photocoupler on failure determination step, since the drive coil between the hot water supply relay contact and the common relay contact is not energized, the output of the hot water supply solenoid valve monitoring circuit should be low. If the output of the hot water supply solenoid valve monitoring circuit is at a high level, it can be determined that the output is always on due to the failure of the first photocoupler. In the hot water relay contact ON failure determination step, the drive coil of the common hot relay contact is energized without energizing the drive coil of the hot water relay contact, so if the hot water relay contact is not opened, the hot water supply solenoid valve The output of the monitoring circuit becomes high level, and in this case, it can be determined that the relay is always closed due to the failure of the hot water supply relay contact. In the common relay contact ON failure determination step, the drive coil of the hot water supply relay contact is energized without energizing the drive coil of the common relay contact. Therefore, if the common relay contact is not opened, the hot water supply solenoid valve is not opened. The output of the monitoring circuit becomes high level. In this case, it can be determined that the output is always closed due to the failure of the common relay contact. In the first photocoupler-off failure determination step, the output of the hot water supply solenoid valve monitoring circuit should be at a high level because the hot water supply burner has been ignited, and the output of the hot water supply solenoid valve monitoring circuit is at a low level. If so, it can be determined that the output is always off due to the failure of the first photocoupler. In the second first photocoupler on failure determination step, since the drive coils of the original relay contact, the hot water supply relay contact, and the bath relay contact are not energized, the output of the hot water supply solenoid valve monitoring circuit should be low. If the output of the hot water supply solenoid valve monitoring circuit is at a high level, it can be determined that the output is always on due to the failure of the first photocoupler.

In addition, in the first assortment 2 photocoupler on failure determination step, since the drive coil between the bath relay contact and the common relay contact is not energized, the output of the bath solenoid valve monitoring circuit should be low. If the output of the bath solenoid valve monitoring circuit is at a high level, it can be determined that the output is always on due to the failure of the second photocoupler. In the bath relay contact on failure determination step, the drive coil of the common relay contact is energized without energizing the drive coil of the bath relay contact. Therefore, if the bath relay contact is not opened, the bath solenoid valve is not opened. The output of the monitoring circuit becomes high level. In this case, it can be determined that the output is always closed due to the failure of the bath relay contact. In the common relay contact ON failure determination step, the drive coil of the bath relay contact is energized without energizing the drive coil of the common relay contact, so if the common relay contact is not opened, the bath solenoid valve is not opened. The output of the monitoring circuit becomes high level. In this case, it can be determined that the output is always closed due to the failure of the common relay contact. In the second photocoupler off failure determination step, since the bath burner has been ignited, the output of the bath solenoid valve monitoring circuit should be high, and the output of the bath solenoid valve monitoring circuit should be low. If so, it can be determined that the output is always off due to the failure of the second photocoupler. In the photocoupler-on failure determination step of the second second, since the drive coils of the original relay contact, the hot water supply relay contact, and the bath relay contact are not energized, the output of the bath solenoid valve monitoring circuit should be low. If the output of the bath solenoid valve monitoring circuit is at a high level, it can be determined that the output is always on due to the failure of the second photocoupler.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.
This will be specifically described with reference to the drawings.

FIG. 2 is an overall configuration diagram of a hot water supply apparatus with a bath kettle employing the combustion apparatus inspection method according to the present invention, in which fuel gas passes through a gas pipe 1 and a hot water supply gas pipe 2 to supply hot water. And supplied to a bath burner 5 through a bath gas pipe 4 branched from the gas pipe 1. The gas pipe 1 is provided with a source solenoid valve 6 for opening and closing a fuel gas flow path constituted by the gas pipe 1 near a branch point between the hot water supply gas pipe 2 and the bath gas pipe 4. The hot water supply gas pipe 2 includes a hot water supply solenoid valve 7 for opening and closing the flow path of the fuel gas to the hot water supply burner 3 and a fuel gas supply to the hot water supply burner 3 near the branch point from the gas pipe 1. A proportional valve 8 for adjusting the flow rate is interposed. The hot water supply solenoid valve 7 is located upstream of the proportional valve 8. In the bath gas pipe 4,
In the vicinity of a branch point with the gas pipe 1, a bath solenoid valve 9 for opening and closing the flow path of the fuel gas to the bath burner 5 is provided. At the end of the hot water supply gas pipe 2 on the side of the hot water supply burner 3, a plurality of hot water supply capacity switching solenoid valves 10 a to 10 c for switching the combustion capacity of the hot water supply burner 3 are interposed. A bath capacity switching electromagnetic valve 11 for switching the combustion capacity of the bath burner 5 is provided at an end on the side of the burner 5. A hot water supply spark plug 12 for igniting the hot water supply burner 3 and a hot water supply frame rod 13 for detecting the flame of the hot water supply burner 3 are installed at the flame forming position of the hot water supply burner 3. The bath spark plug 14 for igniting the bath burner 5
And a bath frame rod 15 for detecting the flame of the bath burner 5.

Water is supplied to a hot water supply heat exchanger 18 through a water supply pipe 17, and the hot water heated by the hot water supply heat exchanger 18 is supplied to a hot water tap 20 through a hot water supply pipe 19, or Then, the water is supplied to a bathtub 24 through a falling pipe 21 and a bath going pipe 22 or a bath returning pipe 23 branched from the hot water supply pipe 19. The water supply pipe 17 is provided with a hot water supply water quantity sensor 25 for detecting the amount of water passing through the water supply pipe 17. The bath outflow pipe 22 and the bath return pipe 23 communicate with each other via a bath heat exchanger 26, and the bath return pipe 23 has a circulation pump 2.
7 and a water flow switch 28 are interposed. At the time of additional cooking of the bath, the hot water in the bathtub 24 is supplied to the bath heat exchanger 26 through the bath return pipe 23 by the circulation pump 27,
It is heated in the bath heat exchanger 26 and returned to the bathtub 24 through the bath pipe 22. At this time, the water switch 28
Thereby, it is detected that the water is passed through the bath return pipe 23.

The original solenoid valve 6, the hot water supply solenoid valve 7, the proportional valve 8, the bath solenoid valve 9 and the like are provided with various sensors such as a hot water supply water volume sensor 25 and a water flow switch 28, as well as by the user. Based on the operation of the remote controller, etc.
It is controlled by a microcomputer (not shown in FIG. 2).

FIG. 1 is a circuit diagram of a drive circuit for the original solenoid valve 6, the hot water supply solenoid valve 7, and the bath solenoid valve 9.
1 is connected to a commercial power source 32 of, for example, 100 volts AC.
It is connected to the. One output terminal of the DC power supply 31 is connected to one terminal of the original relay contact 33 and the hot water supply relay contact 34.
Is connected to one terminal of the bath relay contact 35 and the other terminal of the original relay contact 33 is
One end of the solenoid 6a of the solenoid valve 6 and the diode D1
Connected to the cathode. Hot water relay contact 34
The other terminal is connected to one end of the solenoid 7a of the hot water supply electromagnetic valve 7 and the cathode of the diode D2, and is also connected to one end of the resistor R1 via diodes D4 and D5. The other terminal of the bath relay contact 35 is connected to one end of the solenoid 9a of the bath solenoid valve 9 and the cathode of the diode D3, and is connected to one end of the resistor R2 via the diodes D6 and D7. ing.

The other output terminal of the DC power supply 31 is connected to one terminal of a common relay contact 36, and the other terminal of the common relay contact 36 is connected to the solenoids 6a, 6
a, 9a, the anodes of diodes D1 to D3, and one end of capacitors C1 and C2 and resistors R3 and R4. Capacitor C1 and resistor R
The other end of 3 is connected to the other end of resistor R1, and the other end of capacitor C2 and resistor R4 is connected to the other end of resistor R2. Capacitor C1 and resistor R3
Are connected to the input end of the photocoupler PC1,
Both ends of the capacitor C2 and the resistor R4 are a photocoupler P
It is connected to the input terminal of C2. Photocoupler PC1, P
One output terminal of C2 is a DC power supply V
cc, and the other output terminal of the photocoupler PC1 is connected to one end of the resistor R5 and the output terminal 37a. The other output terminal of the photocoupler PC2 is connected to a resistor R6.
And the other end of the resistors R5 and R6 are grounded. The output terminals 37a,
Reference numeral 38a is connected to an input terminal of the microcomputer 39 and an input terminal of a logic circuit described later. The microcomputer 39 controls the entire hot water supply device with a bath kettle.
Although not shown in FIG. 1, the solenoids of the hot water supply capacity switching solenoid valves 10 a to 10 c and the bath capacity switching solenoid valve 11 are also connected in the same manner as the solenoid 6 a of the original solenoid valve 6.

Now, when the coil (not shown) of the original relay is energized, the original relay contact 33 is closed, the solenoid 6a of the original electromagnetic valve 6 is energized, and the original electromagnetic valve 6 is opened. I do. Further, when the coil (not shown) of the hot water supply relay is energized, the hot water supply relay contact 34 is closed, and the solenoid 7a of the hot water supply electromagnetic valve 7 is energized to open the hot water supply electromagnetic valve 7. At this time, if the hot water supply capacity switching electromagnetic valves 10a to 10c are open, the fuel gas is supplied to the hot water supply burner 3. When the hot water supply relay contact 34 is closed, the input side of the photocoupler PC1 is also energized, and a high level signal is output to the output terminal 37a.

On the other hand, when the coil (not shown) of the bath relay is energized with the main relay contact 33 closed,
The bath relay contact 35 is closed, the solenoid 9a of the bath solenoid valve 9 is energized, the bath solenoid valve 9 is opened, and fuel gas is supplied to the bath burner 5. When the bath relay contact 35 is closed, the input side of the photocoupler PC2 is also energized, and a high-level signal is output to the output terminal 38a.

That is, the photocoupler PC1 and the resistor R
1, R3, R5 and the capacitor C1
Of the solenoid valve 7 for hot water supply, which detects that the solenoid 7a of the bath is energized. The photocoupler PC2, the resistors R2, R4, R6 and the capacitor C2 energize the solenoid 9a of the solenoid valve 9 for bath. A bath solenoid valve monitoring circuit 38 for detecting that the operation has been performed is configured.

FIG. 3 is a circuit block diagram of a safety device for a gas combustion device according to the present invention. The safety device includes a hot water supply solenoid valve monitoring circuit 37 and a hot water supply flame detection circuit 41.
Water supply detection circuit 42 for hot water supply, solenoid valve monitoring circuit 38 for bath, flame detection circuit 43 for bath, water supply detection circuit 44 for bath, AND circuits 45 to 48, and OR circuit 49
, Timer circuit 50, and common relay off circuit 51
And These circuits are realized by hardware, but can also be realized by a software program by a microcomputer 39 except for the hot water supply electromagnetic valve monitoring circuit 37 and the bath electromagnetic valve monitoring circuit 38.

The hot water supply flame detection circuit 41 outputs a high level signal based on the detection signal from the hot water supply frame rod 13 when the flame of the hot water supply burner 3 is not detected. The hot water supply passage detection circuit 42 detects the hot water supply heat exchanger 18 based on a detection signal from the hot water supply water amount sensor 25.
Outputs a high-level signal when water is not passed through. The bath flame detection circuit 43 outputs a high-level signal based on the detection signal from the bath frame rod 15 when the flame of the bath burner 5 is not detected. The bath water detection circuit 44 outputs a high-level signal based on the detection signal from the water switch 28 when water is not passed through the bath heat exchanger 26.

The AND circuit 45 is provided by the hot water supply flame detection circuit 4.
The logical product of the output from the output 1 and the output from the hot water supply electromagnetic valve monitoring circuit 37 is output. The logical product circuit 46 outputs the logical product of the output from the hot water supply electromagnetic valve monitoring circuit 37 and the output from the hot water supply flow detection circuit 42. The AND circuit 47 is connected to the output of the bath flame detection circuit 43 and the bath solenoid valve monitoring circuit 38.
Outputs the logical AND with the output of The AND circuit 48 is connected to the output of the bath solenoid valve monitoring circuit 38 and the bath passage detecting circuit 44.
Outputs the logical AND with the output of The OR circuit 49 outputs a logical sum of the outputs of the AND circuits 45 to 48. The timer circuit 50 is an on-delay timer, and outputs a high-level signal when the output of the OR circuit 49 is kept at a high level for a predetermined time.
Is inverted to a low level, a low level signal is output at the same time. The delay time of the timer circuit 50 is configured to be adjustable within a certain range by a volume or the like. Common relay off circuit 51
When the output of the timer circuit 50 is at a high level, the energization of the coil of the common relay is cut off, and the common relay contact 36 is opened. When the common relay off circuit 51 closes the common relay contact 36, the microcomputer 39 executes an abnormality process such as stopping the automatic operation and displaying an abnormality.

That is, the common relay contact 36 is provided with a solenoid valve 7a for the hot water supply solenoid valve 7 or the bath solenoid valve 9 for opening and closing a gas flow path for supplying a fuel gas to the hot water supply burner 3 or the bath burner 5. 9a and DC power supply 31
The hot water supply solenoid valve monitoring circuit 37 or the bath solenoid valve monitoring circuit 38 comprises a hot water supply solenoid valve 7 or a bath solenoid valve 9.
Solenoid valve monitoring means for detecting that the solenoids 7a and 9a are energized.

The frame rod 13 for hot water supply and the flame detection circuit 41 for hot water supply as a flame detection sensor, or the frame rod 15 for bath and the flame detection circuit 43 for bath as a flame detection sensor comprise the burner 3 for hot water supply or the bath. A flame detecting means for detecting the flame of the burner 5 is constituted by a hot water supply water amount sensor 25 and a hot water supply detection circuit 42 as water detection sensors, or a water switch 28 as a water detection sensor and a bath switch 28 for bath. The water passage detection circuit 44 constitutes water passage detection means for detecting water passage of the hot water supply heat exchanger 18 or the bath heat exchanger 26 heated by the flame of the hot water supply burner 3 or the bath burner 5. I have.

The common relay-off circuit 51 is energized by the hot water supply solenoid valve monitoring circuit 37 or the bath solenoid valve monitoring circuit 38, and the hot water supply flame detection circuit 4
1 or a state in which no flame is detected by the bath flame detection circuit 43 for a predetermined period of time, or the hot water supply solenoid valve monitoring circuit 37 or the bath solenoid valve monitoring circuit 38
When the state where no current is detected by the hot water supply detection circuit 42 or the hot water supply detection circuit 44 for a predetermined period of time has been detected for a predetermined time, the common relay contact 36 is opened to form a power supply cutoff means. are doing.

Here, the safe operation will be described. Now
Assuming that the hot water supply burner 3 is not ignited and the hot water supply frame rod 13 has not detected a flame, a high level signal is output from the hot water supply flame detection circuit 41. Here, assuming that source relay contact 33 and hot water supply relay contact 34 are welded, the solenoids 6a and 7a of main electromagnetic valve 6 and hot water supply electromagnetic valve 7 are energized, and main electromagnetic valve 6 and hot water supply electromagnetic valve 7 are energized. When the valve is opened and the hot water supply capacity switching electromagnetic valves 10a to 10c are open, unburned fuel gas flows out of the hot water supply burner 3. At this time, the hot water supply electromagnetic valve monitoring circuit 37 detects the energization of the solenoid 7a of the hot water supply electromagnetic valve 7 and outputs a high-level signal. Therefore, the output of the AND circuit 45 is inverted to a high level, and the output of the OR circuit 49 is also inverted to a high level. When this state continues for a predetermined time, a high-level signal is output from the timer circuit 50, whereby the common relay off circuit 51 cuts off the current to the coil of the common relay and opens the common relay contact 36. Therefore, the original solenoid valve 6 and the hot water supply solenoid valve 7
The power supply to the solenoids 6a and 7a is shut off, the original solenoid valve 6 and the hot water supply solenoid valve 7 are closed, and the outflow of unburned fuel gas from the hot water supply burner 3 is shut off. The coil of the common relay is always energized after ignition, for example, and the common relay contact 36 is normally closed.

On the other hand, water is not passed through the water supply pipe 17,
Assuming that the hot water supply water amount sensor 25 has not detected the water amount, a high level signal is output from the hot water supply passage detection circuit 42. Here, if the original relay contact 33 and the hot water supply relay contact 34 are welded, the original solenoid valve 6
When the solenoids 6a and 7a of the hot water supply electromagnetic valve 7 are energized, the original solenoid valve 6 and the hot water supply electromagnetic valve 7 are opened, and if the hot water supply capacity switching electromagnetic valves 10a to 10c are open, the hot water supply Fuel gas flows out of the burner 3. At this time, the hot water supply electromagnetic valve monitoring circuit 37 detects the energization of the solenoid 7a of the hot water supply electromagnetic valve 7 and outputs a high-level signal. Therefore, the output of the AND circuit 46 is inverted to the high level state, and the output of the OR circuit 49 is also inverted to the high level state. If this state continues for a predetermined time,
A high-level signal is output from the timer circuit 50, whereby the common relay off circuit 51 cuts off the current to the coil of the common relay, and the common relay contact 36
Is opened. Therefore, the power supply to the solenoids 6a and 7a of the original electromagnetic valve 6 and the hot water supply electromagnetic valve 7 is cut off, the original electromagnetic valve 6 and the hot water supply electromagnetic valve 7 are closed, and the fuel gas from the hot water supply burner 3 is closed. The spill is blocked. That is, even if the output signal of the hot water supply flame detection circuit 41 is at a low level, the original electromagnetic valve 6, the hot water supply electromagnetic valve 7, and the like can be closed.

The same operation is performed on the bath side. That is, assuming that the bath burner 5 has not been ignited and the bath frame rod 15 has not detected the flame, the bath flame detection circuit 43 outputs a high-level signal. Here, if the original relay contact 33 and the bath relay contact 35 are welded, the solenoids 6a and 9a of the original electromagnetic valve 6 and the bath electromagnetic valve 9 are energized, and the original electromagnetic valve 6 and the bath electromagnetic valve 9 are energized. The valve is opened, and unburned fuel gas flows out of the bath burner 5. At this time, the bath solenoid valve monitoring circuit 38 detects the energization of the solenoid 9a of the bath solenoid valve 9, and outputs a high-level signal. Therefore, the output of the AND circuit 47 is inverted to a high level, and the output of the OR circuit 49 is also inverted to a high level. When this state continues for a predetermined time, the timer circuit 5
A high-level signal is output from 0, whereby the common relay off circuit 51 cuts off the current to the coil of the common relay and opens the common relay contact 36.
Therefore, energization to the solenoids 6a and 9a of the original solenoid valve 6 and the bath solenoid valve 9 is cut off, the original solenoid valve 6 and the bath solenoid valve 9 are closed, and unburned fuel from the bath burner 5 is discharged. Gas outflow is shut off.

On the other hand, assuming that the water is not passed through the bath return pipe 23 and the water switch 28 does not detect the water flow, a high level signal is output from the bath water detection circuit 44. ing. Here, if the original relay contact 33 and the bath relay contact 35 are welded, the original solenoid valve 6
Also, the solenoids 6a and 9a of the bath solenoid valve 9 are energized, and the original solenoid valve 6 and the bath solenoid valve 9 are opened, so that the fuel gas flows out of the bath burner 5. At this time, the bath solenoid valve monitoring circuit 38 detects the solenoid 9 of the bath solenoid valve 9.
a, and outputs a high-level signal.
Therefore, the output of the AND circuit 48 is inverted to a high level, and the output of the OR circuit 49 is also inverted to a high level. When this state continues for a predetermined time, a high-level signal is output from the timer circuit 50, whereby the common relay off circuit 51 cuts off the current to the coil of the common relay and opens the common relay contact 36. Therefore, the power supply to the solenoids 6a and 9a of the original solenoid valve 6 and the bath solenoid valve 9 is cut off, the original solenoid valve 6 and the bath solenoid valve 9 are closed, and the fuel gas flows out of the bath burner 5. Is shut off. That is, even if the output signal of the bath flame detection circuit 43 is at a low level, the original solenoid valve 6 and the bath solenoid valve 9 can be closed.

Next, a description will be given of a method of inspecting safety equipment, which is a gist of the present invention. The following procedures are all executed by the microcomputer 39. At the time of hot water supply, as shown in the flowchart of FIG. 4, before the hot water supply burner 3 is ignited, it is determined whether or not the water supply is detected by the hot water supply water amount sensor 25 (step S1). If water passage is not detected, the process returns to step S1. If water flow is detected, the hot water supply relay contact 34 and the common relay contact 36
It is determined whether or not the output of the first photocoupler PC1 is off without energizing the drive coil (step S2) (step S3). Specifically, it is determined whether or not the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a low level. Hot water relay contact 34 and common relay contact 36
Since the drive coil is not energized, the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 should be at a low level, and if the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 is at a high level, By judging that the output is always on due to the failure of the photocoupler PC1 of No. 1, the power supply to the drive coil of the relay contact 33 for the main unit, the relay contact 34 for the hot water supply and the relay contact 35 for the bath is all cut off, The source solenoid valve 6, the hot water supply solenoid valve 7, the bath solenoid valve 9 and the like are all closed (step S4), safety operations such as abnormal display and operation stop are executed (step S5), and the routine ends.

In step S3, if the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 is at a low level, the drive coil of the common relay contact 36 is not supplied with electricity, but the drive coil of the hot water supply relay contact 34 is not supplied with electricity. (Step S
6) It is determined whether or not the hot water supply relay contact 34 has been opened (step S7). Specifically, it is determined whether or not the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a low level. That is, since the drive coil of the common relay contact 36 is energized, the output terminal 3 of the hot water supply solenoid valve monitoring circuit 37 is provided if the hot water supply relay contact 34 is not opened.
7a becomes high level. In this case, it can be determined that the relay is always closed due to the failure of the hot water supply relay contact 34. If the hot water relay contact 34 has not been opened, the process proceeds to step S4.
Proceed to. If the hot water supply relay contact 34 is open, the drive coil of the hot water supply relay contact 34 is energized without energizing the drive coil of the common relay contact 36 (Step S).
8) It is determined whether the common relay contact 36 is open (step S9). Specifically, it is determined whether or not the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a low level. That is, since the drive coil of the hot water supply relay contact 34 is energized, the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 becomes high level unless the common relay contact 36 is opened. It can be determined that the relay relay contact 36 is always closed due to a failure. If the common relay contact 36 is not open, the process proceeds to step S4.

If the common relay contact 36 is open, the operation proceeds to the ignition operation. The hot water supply relay contact 34 and the common relay contact 36 are closed, and the hot water supply ignition plug 12 is energized to ignite the hot water supply burner 3 (step S10). After ignition, the output of the first photocoupler PC1 is turned on. It is determined whether or not there is (step S11). Specifically, it is determined whether or not the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a high level. If the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a low level, the first
It is determined that the output is always off due to the failure of the photocoupler PC1, and the process proceeds to step S4. If the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 is at the high level, it is determined whether or not the water supply is detected by the hot water supply water amount sensor 25 (step S12). Hot water supply water sensor 25
If the flow of water is detected by, the combustion of the hot water supply burner 3 is not completed, and the process returns to step S11. If water supply is not detected by the hot water supply amount sensor 25, the combustion of the hot water supply burner 3 is completed and the post-purge state is established, so that the original relay contact 33, the hot water supply relay contact 34, and the bath relay contact 35 Without energizing the drive coil, all the original solenoid valves 6, the hot water supply solenoid valve 7, the bath solenoid valve 9 and the like are closed (step S13), and the first photocoupler P
It is determined whether or not the output of C1 is off (Step S)
14). Specifically, it is determined whether or not the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at a low level. If the output terminal 37a of the hot water supply electromagnetic valve monitoring circuit 37 is at the high level, it is determined that the output is always on due to the failure of the first photocoupler PC1, and the process proceeds to step S4. If the output terminal 37a of the hot water supply solenoid valve monitoring circuit 37 is at a low level, it is determined whether or not the post-purge has been completed (step S15). It is determined whether or not it has been performed (step S16). If water flow is detected, step S
Returning to step S10, if water flow is not detected, step S
Return to 13. In step S15, if the post-purge has been completed, this routine ends.

The same operation is performed at the time of additional cooking in the bath. That is, at the time of additional cooking, as shown in the flowchart of FIG.
Then, it is determined whether or not water flow is detected in step S8 (step S21). If water passage is not detected, the process returns to step S1. If the passage of water is detected, it is determined whether or not the output of the second photocoupler PC2 is off without energizing the drive coils of the bath relay contact 35 and the common relay contact 36 (step S22). (Step S23). Specifically, it is determined whether or not the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a low level. Bath relay contact 35
Since the drive coil of the common relay contact 36 is not energized, the output terminal 3 of the bath solenoid valve monitoring circuit 38
8a should be at the low level, and if the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at the high level, it is determined that the output is always on due to the failure of the second photocoupler PC2, and the relay for the original is determined. Contact 33 and hot water relay contact 34
By shutting off all the energization of the drive coil between the battery and the bath relay contact 35, the original solenoid valve 6, the hot water supply solenoid valve 7, the bath solenoid valve 9 and the like are all closed (step S24).
A safety operation such as an abnormal display or operation stop is performed (step S25), and the routine ends.

In step S23, if the output terminal of the bath solenoid valve monitoring circuit 38 is at the low level, the drive coil of the bath relay contact 35 is not energized but the drive coil of the common relay contact 36 is energized. (Step S2
6) It is determined whether or not the bath relay contact 35 has been opened (step S27). Specifically, it is determined whether or not the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a low level. That is, since the drive coil of the common relay contact 36 is energized, unless the bath relay contact 35 is opened, the output terminal 38a of the bath solenoid valve monitoring circuit 38 goes to a high level. It can be determined that the relay is always closed due to the failure of the relay contact 35. If the bath relay contact 35 has not been opened, step S
Proceed to 24. If the bath relay contact 35 is open,
The drive coil of the bath relay contact 35 is energized without energizing the drive coil of the common relay contact 36 (step S28), and it is determined whether the common relay contact 36 is open (step S29). . Specifically, it is determined whether or not the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a low level. That is, the bath relay contact 35
If the common relay contact 36 is not open, the bath solenoid valve monitoring circuit 38
Becomes high level, and in this case, it can be determined that the common relay contact 36 is always closed due to a failure. If the common relay contact 36 has not been opened, the process proceeds to step S24.

If the common relay contact 36 is open, the bath ignition plug 14 is energized to ignite the bath burner 5 (step S30), and after ignition, the output of the second photocoupler PC2 is on. It is determined whether or not this is the case (step S31). Specifically, it is determined whether or not the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a high level.
If the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at the low level, it is determined that the output is always off due to the failure of the second photocoupler PC2, and the process proceeds to step S24. If the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at the high level, it is determined whether or not the water flow is detected by the water flow switch 28 (step S32). If water passage is detected by the water passage switch 28, the combustion of the bath burner 5 is not completed, and the process returns to step S31. If the passage of water is not detected by the passage switch 28, the combustion of the bath burner 5 is completed and the post-purge state is established, so that the main relay contact 33, the hot water supply relay contact 34, and the bath relay contact 35 Without turning on the drive coil, all the original solenoid valves 6, the hot water supply solenoid valve 7, the bath solenoid valve 9 and the like are closed (step S33), and is the output of the second photocoupler PC2 turned off? It is determined whether or not it is (step S34). Specifically, the bath solenoid valve monitoring circuit 3
8 is determined whether the output terminal 38a is at a low level. If the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a high level, it is determined that the output is always on due to the failure of the second photocoupler PC2, and the process proceeds to step S24. If the output terminal 38a of the bath solenoid valve monitoring circuit 38 is at a low level, it is determined whether the post-purge has been completed (step S35). If not, the water flow is detected by the water flow switch 28. It is determined whether or not it has been performed (step S36). If water passage is detected, the process returns to step S30. If water passage is not detected, the process returns to step S33. If the post-purge has been completed in step S35, this routine ends.

In the above-described embodiment, an example is described in which the method for inspecting a combustion device according to the present invention is applied to a hot water supply device with a bath kettle, but the method for inspecting a combustion device according to the present invention does not include a bath kettle. Of course, it can be adopted for a hot water supply device. In this case, it is not necessary to provide both the original electromagnetic valve 6 and the hot water supply electromagnetic valve 7, so both can be represented by the hot water supply electromagnetic valve 7 and the original electromagnetic valve 6 can be omitted. Therefore, control of the original electromagnetic valve 6 and the bath electromagnetic valve 9 is unnecessary, and there is no need to provide the original relay contact 33 and the bath relay contact 35. Moreover,
Needless to say, the method for inspecting a combustion device according to the present invention can be applied to a combustion device other than the hot water supply device.

Further, in the above embodiment, step S in FIG.
3, S7, S9 and steps S23, S2 in FIG.
7, S29 is executed in this order, but these orders are arbitrary.

Further, in the above embodiment, step S in FIG.
14 and step S34 in FIG. 5, the on-failure of the photocouplers PC1, PC2 is determined. However, the on-failure of the photocouplers PC1, PC2 is already determined in step S3 of FIG. 4 and step S23 of FIG. It is not necessary to judge again.

Also, in the above embodiment, step S in FIG.
Although steps S21 to S28 in FIG. 5 and steps S21 to S28 in FIG. 5 are configured to be executed at the time of prepurge, it is not always necessary to configure in such a manner. May be performed.
In this case, it is not always necessary to detect the passage of water.

In the above embodiment, the photocoupler PC is connected to the hot water supply solenoid valve monitoring circuit 37 and the bath solenoid valve monitoring circuit 38.
1, PC2 is used because the power supply needs to be a separate system, and a current transformer or the like may be used instead of the photocouplers PC1, PC2.

[0050]

As described above, according to the present invention,
Failures of important safety devices such as signal transmission devices, common switch means and switch means can be automatically checked during operation of the combustion device. Therefore, the safety operation of preventing leakage of unburned fuel can be surely performed when necessary, without the trouble of performing the inspection when not in operation.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a drive circuit of an electromagnetic valve provided in a water heater with a bath kettle employing a combustion device inspection method according to the present invention.

FIG. 2 is an overall configuration diagram of a hot water supply device with a bath kettle employing a combustion device inspection method according to the present invention.

FIG. 3 is a circuit block diagram of a safety device provided in a hot water supply device with a bath kettle employing the combustion device inspection method according to the present invention.

FIG. 4 is a flowchart illustrating a procedure of a hot water supply side inspection method according to the present invention.

FIG. 5 is a flowchart illustrating a procedure of a bath-side inspection method according to the present invention.

[Explanation of symbols]

 2 Gas pipe for hot water supply 3 Burner for hot water supply 4 Gas pipe for bath 5 Burner for bath 7 Solenoid valve for hot water 7a Solenoid 9 Solenoid valve for bath 9a Solenoid 13 Frame rod for hot water supply 15 Frame rod for bath 25 Water sensor for hot water supply 28 Water flow Switch 31 DC power supply 34 Hot water supply relay contact 35 Bath relay contact 36 Common relay contact 37 Hot water supply solenoid valve monitoring circuit 38 Bath solenoid valve monitoring circuit 39 Microcomputer 41 Hot water supply flame detection circuit 42 Hot water supply detection circuit 43 Bath flame detection circuit 44 Bath water passage detection circuit 50 Timer circuit 51 Common relay off circuit

Continued on the front page (72) Inventor Norihiro Miyamoto 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Tadashi Matsubara 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. Person Yoichiro Murakami 32 Noritsu, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Shinichi Chikada 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. 32 Noritsu, Akashi-cho, Tokyo (72) Inventor Tadahiko Oshio 32nd Akashi-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz (72) Inventor Nobuyuki Inoue 32, Akashi-cho, Chuo-ku, Kobe, Hyogo Noritsu, Ltd. (72) Inventor Hironobu Anfuku 32, Akashi-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. (72) Inventor Kenken Kubotani 32, Akashi-cho, Chuo-ku, Kobe City, Hyogo Prefecture Noritsu Co., Ltd. (56) References JP-A 1-260215 (JP, A) JP-A-8-233258 (JP, A) JP-A-60-178221 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/24 113

Claims (3)

(57) [Claims] 1. A common switch which is interposed between a power supply and an electromagnetic valve for opening and closing a flow path for supplying fuel to a burner and which is different from a switch means for normally controlling energization of the electromagnetic valve. Means, a signal transmission device for transmitting a signal between the input side and the output side, a solenoid valve monitoring means for detecting that the solenoid valve is energized, in the combustion device provided, the signal transmission device and the A method of inspecting a combustion device for inspecting a failure of a switch unit and the common switch unit, wherein the output of the solenoid valve monitoring unit is on without turning on the switch unit and the common switch unit. A signal transmission device on failure determination step of determining that an output is always on due to a failure of the signal transmission device, and without turning on the switch device, turning on the common switch device, If the output is on the serial solenoid valve monitoring means, switch means ON failure determination step that is always determined to be closed due to a failure of said switch means, without turning on the common switch means, said switch
Turning on the means , and if the output of the solenoid valve monitoring means is on, the common switch means on failure determining step of determining that the common switch means is always closed due to a failure of the common switch means, in any order. A method for inspecting a combustion device. 2. A switch means interposed between a solenoid of a solenoid valve for opening and closing a flow path for supplying fuel to the burner and a DC power supply, and an interposition between the switch means and the DC power supply. A common switch means, comprising a photocoupler whose input side is connected to the DC power supply via the switch means and the common switch means,
A solenoid valve monitoring circuit that outputs a high-level signal when the solenoid of the solenoid valve is energized; and a combustion device for inspecting a failure of the photocoupler, the switch means, and the common switch means. Before the ignition of the burner, without turning on the switch means and the common switch means, if the output of the solenoid valve monitoring circuit is at a high level, the output due to failure of the photocoupler A photo coupler on failure determining step of determining that the switch is always on, and turning on the common switch means without turning on the switch means, and if the output of the solenoid valve monitoring circuit is at a high level, the switch A switch means on failure determination step for determining that the switch is always closed due to a failure of the means; Without turning on the switch means, if the output of the solenoid valve monitoring circuit is at a high level, a common switch means on failure determination step of determining that the common switch means is always closed due to a failure. If the output of the solenoid valve monitoring circuit is at a low level after ignition of the burner, a photo coupler off failure determination step of determining that the output is always off due to the failure of the photo coupler is performed. A method for inspecting a combustion apparatus, which is characterized by 3. An original relay contact interposed between a DC solenoid and a solenoid of an original solenoid valve for opening and closing an original gas flow path for supplying fuel gas to a hot water supply burner and a bath burner; A relay for hot water supply interposed between the solenoid of a solenoid valve for hot water supply for opening and closing a hot water supply gas flow path for supplying a fuel gas to the hot water supply burner by branching from the original gas flow path and the DC power supply A bath interposed between the solenoid of a bath solenoid valve that opens and closes a bath gas flow path for supplying fuel gas to the bath burner by branching from the original gas flow path and the DC power supply A relay contact for the common, a relay contact for the common interposed between all of the relay contact for the main unit, the relay contact for the hot water supply and the relay contact for the bath and the DC power supply, the relay contact for the hot water supply and the Common relay contacts A hot water supply solenoid valve monitoring circuit that has a first photocoupler whose input side is connected to the DC power supply, and that outputs a high-level signal when a solenoid of the hot water supply solenoid valve is energized; A second electromagnetic coupler having an input side connected to the DC power supply via a contact and the common relay contact, and outputting a high-level signal when energized to a solenoid of the bathroom electromagnetic valve; A valve monitoring circuit, based on a detection signal from a hot water supply flame rod that detects the flame of the hot water supply burner, a hot water supply flame detection circuit that outputs a high-level signal when the hot water supply burner flame is not detected. When a flame of the bath burner is not detected based on a detection signal from a bath frame rod for detecting a flame of the bath burner, a high level signal is output. A flame detection circuit for outputting a hot water supply, and a detection signal from a hot water supply water amount sensor for detecting a water supply amount to a hot water supply heat exchanger heated by the hot water supply burner. A hot water supply detection circuit that outputs a high-level signal when water is not passed through, and a detection signal from a water switch that detects water supply of a bath heat exchanger heated by the bath burner. On the basis of the,
A bath water flow detection circuit that outputs a high-level signal when water is not passed through the bath heat exchanger, an output signal of the hot water flame detection circuit, and an output signal of the hot water supply electromagnetic valve monitoring circuit. A first logical product circuit that outputs a logical product of: a second logical product circuit that outputs a logical product of an output signal of the hot water supply passage detection circuit and an output signal of the hot water supply electromagnetic valve monitoring circuit; A third AND circuit that outputs a logical product of an output signal of the bath flame detection circuit and an output signal of the bath solenoid valve monitoring circuit; an output signal of the bath water flow detection circuit and the bath electromagnetic wave; A fourth AND circuit that outputs a logical product of the output signal of the valve monitoring circuit, an OR circuit that outputs a logical sum of outputs of the first to fourth AND circuits, and an output of the logical OR circuit Is high level for a predetermined period of time. And a common relay-off circuit for opening the common relay contact when the timer circuit outputs a high-level signal, wherein the first and second photocouplers are provided. And a method of inspecting a combustion device for inspecting a failure of the hot water supply relay contact and the bath relay contact and the common relay contact, wherein at the time of hot water supply, before the hot water supply burner is ignited and the amount of the hot water supply water. After detecting water flow by the sensor, if the output of the solenoid valve monitoring circuit for hot water supply is at a high level without energizing the drive coil of the relay contact for hot water supply and the relay contact for common, the first A first-order photocoupler-on failure determining step of determining that the output is always on due to the failure of the photocoupler; When the drive coil of the common relay contact is energized without energizing the coil and the output of the hot water supply solenoid valve monitoring circuit is at a high level, the relay is always closed due to the failure of the hot water supply relay contact. A hot water supply relay contact on failure determining step, and energizing the drive coil of the hot water relay contact without energizing the drive coil of the common relay contact, so that the output of the hot water supply electromagnetic valve monitoring circuit is If the high level, the hot water supply burner is ignited, and the hot water supply solenoid valve is ignited. If the output of the monitoring circuit is at a low level, it is determined that the output is always off due to the failure of the first photocoupler.
Executing the photocoupler-off failure determining step of, after extinguishing the hot water supply burner and after the hot water supply water amount sensor no longer detects water flow, the main relay contact, the hot water supply relay contact, and the bath relay. If the output of the hot water supply solenoid valve monitoring circuit is at a high level without energizing the drive coil with the contact, the first
And performing a second photocoupler-on failure determination step of determining that the output is always on due to the failure of the photocoupler. After water is detected, if the output of the bath solenoid valve monitoring circuit is at a high level without energizing the drive coil of the bath relay contact and the common relay contact, the second photocoupler A first-order second photocoupler-on failure determining step of determining that the output is always on due to a failure; and energizing the drive coil of the common relay contact without energizing the drive coil of the bath relay contact. If the output of the bath solenoid valve monitoring circuit is at a high level, it is determined that the bath relay contact is always closed due to the failure of the bath relay contact. Disconnecting step, without energizing the drive coil of the common relay contact, energizing the drive coil of the bath relay contact, if the output of the bath solenoid valve monitoring circuit is at a high level, Performing a common relay contact on failure determination step of determining that the relay is always closed due to a failure of the relay contact.If the output of the bath solenoid valve monitoring circuit is at a low level after ignition of the bath burner, For example, the second photocoupler determines that the output is always off due to the failure of the second photocoupler.
Performing a photocoupler-off failure determination step of, after extinguishing the bath burner and after the passage of water is no longer detected by the passage switch, the main relay contact, the hot water supply relay contact, and the bath relay contact If the output of the bath solenoid valve monitoring circuit is at a high level without energizing the drive coil of
A second second photo coupler on failure determination step of determining that the output is always on due to the photo coupler failure.