JP6865141B2 - Combustion device - Google Patents

Description

The present invention relates to a combustion device including a can body in which an inner heat medium is heated.

Conventionally, in this type of thing, a heat exchanger for hot water supply and a heat exchanger for bath are provided in the can body in which the heat medium for heating is stored, and heating, hot water supply, reheating of the bath and heat retention are performed respectively. It was done well. (See, for example, Patent Document 1.)

In addition, when an abnormality such as clogging of the fins of the heat exchanger occurs, the temperature of the air inside the frame rises, and the components such as the control device made of the substrate housed inside the frame are exposed to high temperature. Therefore, an in-flight temperature sensor that detects the temperature of the air inside the frame is provided, the burner is burning, the air supply fan is driven, the circulation pump is driven, and the in-flight temperature. When the temperature detected by the thermista exceeds the upper limit temperature, the combustion of the burner is stopped, the air supply fan is driven, and the in-flight cooling operation for driving the circulation pump is executed. (See, for example, Patent Document 2.)

JP 2001-65884 Japanese Unexamined Patent Publication No. 2016-118321

By the way, in this conventional one, when the temperature detected by the in-flight temperature thermista exceeds the upper limit temperature, the in-flight cooling operation is executed by driving the air supply fan, but a high-temperature heat medium or hot water is introduced into the can body. If a heat exchanger that stores hot water and exchanges heat with the high-temperature heat medium or hot water is installed inside the can to supply hot water, heat, or reheat the bath, a ventilation fan is provided to cool the inside of the frame. In this case, even if the ventilation fan is out of order, it cannot be detected, the temperature inside the frame rises and becomes high, and the control board inside the frame is due to the heat. There was a problem that it would break down.

In order to solve the above problems, the first aspect of the present invention, a burner unit, a can body inside of the heat medium in the combustion of the burner unit is heated, and the can body and the burner portion therein detection and provided a frame member, and the internal temperature detection sensor for detecting the temperature of the frame body, and a control board provided in the frame body, provided in the vicinity of the control board, the temperature of the air near the control board In the combustion device provided with the substrate atmosphere temperature detection sensor and the ventilation fan for ventilating the air in the frame, the control substrate is initially set with the heat medium inside by the combustion of the burner portion. Heat to the target boiling temperature , operate the ventilation fan according to the temperature detected by the in-flight temperature detection sensor to perform in-flight cooling operation, and when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than the predetermined temperature, an abnormality occurs. It is characterized in that it is determined that the heat is generated and the target boiling temperature is reset to a temperature lower than the initially set temperature .

Further, in claim 2, wherein the control board, the rear reconfigure the target boiling temperature, when the temperature of the substrate ambient temperature detection sensor detects is equal to or higher than the predetermined temperature, it is determined that the exhaust fan is faulty The operation is stopped and an abnormality is notified.

According to claim 1 of the present invention, the in-flight cooling operation by the ventilation fan is controlled by the detection temperature of the in-flight temperature detection sensor, and the temperature abnormality is determined by the detection temperature of the substrate atmosphere temperature detection sensor provided in the vicinity of the control board. Therefore, even if the in-flight temperature detection sensor fails, the board atmosphere temperature detection sensor detects the ambient temperature of the control board and determines that an abnormality has occurred. Therefore, even if the in-flight temperature detection sensor fails, the control board heats up. It is possible to take measures to prevent the temperature from breaking down.

Also, even if the board atmosphere temperature detection sensor fails, if the in-flight temperature detection sensor detects the high temperature inside the machine and performs the in-flight cooling operation with the ventilation fan, and the in-flight temperature detection sensor still detects the high temperature, it is said that an abnormality has occurred. Since the determination is made, even if the substrate atmosphere temperature detection sensor fails, measures can be taken to prevent the control substrate from failing due to heat.

Further, since the pre-Symbol board ambient temperature sensor performs control to lower the target boiling temperature of the to heating can body detects the surrounding temperature of the control board, the ambient temperature of the control board is not immediately stopped even at high temperature, the control board It is possible to reduce the deterioration of usability without causing damage due to heat.

Further, according to claim 2, after re-sets the target boiling temperature, when the temperature of the substrate ambient temperature detection sensor detects is equal to or higher than the predetermined temperature, stopping the operation determines that the exhaust fan is faulty However, since the abnormality is notified, even if the in-flight temperature detection sensor fails, the board atmosphere temperature detection sensor detects the ambient temperature of the control board and lowers the target boiling temperature of the heating can body, but the board atmosphere temperature detection sensor still When it detects a high temperature, it judges that an abnormality such as a malfunction of the ventilation fan has occurred and stops the combustion operation of the burner part, so even if the in-flight temperature detection sensor fails, the control board will fail due to heat. Can be prevented.

In addition, even if the board atmosphere temperature detection sensor fails, the in-flight temperature detection sensor detects the high temperature inside the machine and performs the in-flight cooling operation by the ventilation fan, but if the in-flight temperature detection sensor still detects the high temperature, the ventilation fan is said to be out of order. Since it is determined that an abnormality has occurred and the burning operation of the burner portion is stopped, it is possible to prevent the control board from failing due to heat even if the board atmosphere temperature detection sensor fails.

In addition, since the failure of the ventilation fan is determined by the detection temperature of the substrate atmosphere temperature detection sensor that detects the ambient temperature of the control board, a dedicated detection means for determining the failure of the ventilation fan becomes unnecessary, and the ventilation fan can be used without increasing the cost. It is possible to judge the failure.

FIG. 6 is a schematic configuration diagram of a combustion device with an embodiment of the present invention. The flowchart of the in-flight cooling operation.

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a heating can body having a combustion chamber 3 having a burning burner portion 2 at the bottom, and inside the can body 1, the heat for hot water supply constituting an indirect heating type heat exchanger for hot water supply by a serpentine tube. The exchanger 4 and the bath heat exchanger 5 constituting the indirect heating type bath-heating heat exchanger using a serpentine tube are arranged one above the other to perform hot water heating and hot water supply and bath-heating at the same time or individually. It is something that can be done.

First, the heating circuit A will be described. 6 is a heating going pipe, 7 is a heating radiator such as a floor heating panel, 8 is a heating return pipe, 9 is a heating circulation pump, 10 is a gas-liquid separator, and 11 is. An expansion tank for heating, 12 is a heating bypass pipe provided with an on-off valve 13, 14 is a can body temperature sensor used for temperature control of the heating can body 1, and the heating can body 1 can be burned by burning the burner portion 2. The heat medium heated to the target boiling temperature (85 ° C.) of the body temperature sensor 14 is sent to the heating radiator 7 via the heating going pipe 6 by the heating circulation pump 9 to perform heating and dissipate heat for heating. The low-temperature water (about 30 ° C. to 50 ° C.) radiated by the vessel 7 returns to the heating can body 1 via the heating return pipe 8 and is heated to the target boiling temperature again and circulated.

Next, the hot water supply circuit B will be described. 15 is a water supply pipe connected to a water heater, 16 is a flow rate sensor that detects the flow rate of water, 17 is a hot water supply pipe that discharges hot water heated by a hot water supply heat exchanger 4, and 18 Is a hot water supply tap, 19 is a hot water supply bypass pipe that is connected to the hot water supply pipe 17 via a mixing valve 20 and connects the water supply pipe 15 and the hot water supply pipe 17, and 21 is a hot water supply expansion that absorbs the thermal expansion when the hot water supply tap 18 is closed. The tank, 22 is a water supply temperature sensor, 23 is a hot water supply temperature sensor, and when the hot water supply tap 18 is opened and the flow rate sensor 16 detects the minimum operating flow rate, the temperature of the heat medium in the heating can body 1 is about 88 ° C. Burning is performed in the burner section 2 so as to maintain a high temperature, cold water from the water supply pipe 15 is indirectly heated by the high temperature heat medium in the heating can body 1 in the hot water supply heat exchanger 4, and tap water is combined with the mixing valve 20. The hot water is supplied from the hot water tap 18 after being mixed and adjusted to an appropriate temperature.

Reference numeral 24 denotes an antifreezing heater for a hot water supply pipe, which generates heat when energized to prevent the water in the hot water supply pipe 17 from freezing. 25 is an antifreezing heater for a water supply pipe, which generates heat when energized. , This is to prevent the water in the water supply pipe 15 from freezing.

Next, the bath circuit C will be described. 26 is a bath tub, 27 is a bath going pipe, 28 is a bath return pipe, 29 is a bath circulation pump provided in the bath return pipe 28, and 30 is a running water switch for detecting the presence or absence of circulation. , 31 is a bath temperature sensor, and when there is a request to boil the hot water in the bath 26, the hot water in the bath 26 is circulated to the heat exchanger 5 for the bath by the bath circulation pump 29, and the hot water in the bath 26 is for heating. The hot water in the bathtub 26 is boiled or kept warm to an appropriate temperature by being indirectly heated by a high-temperature heat medium in the can body 1.

Reference numeral 32 denotes a hot water filling pipe that is branched from the hot water supply pipe 17 of the hot water supply circuit B and connected to the bath circuit C via the hot water filling valve 33 and the three-way valve 34. The bath circuit C and the hot water filling pipe 32 are switched to communicate with each other, the hot water filling valve 33 is opened, and the hot water heated by the hot water supply heat exchanger 4 is allowed to flow into the bath circuit C to be constant to the bath tub 26. A large amount of hot water is added.

Reference numeral 35 denotes a three-way valve for the bath circuit, which is provided in the bath going pipe 27, and the other end of the bath bypass pipe 36, one end of which is connected between the bath circulation pump 29 of the bath returning pipe 28 and the three-way valve 34, is connected. Is what you are doing.

Reference numeral 37 denotes an antifreeze heater for bath piping, which generates heat when energized to prevent the water in the bath circuit from freezing. It is provided in the bath going pipe 27 near the connection portion between the bath heat exchanger 5 and the bath going pipe 27, which is a position where heat is transferred to the heat medium in the heating can body 1 via the bath heat exchanger 5. It is something that is.

Here, 38 is a communication pipe connecting the upper and lower parts of the heating can body 1, and 39 is a circulation pump for stirring provided in the middle of the communication pipe 38, which is driven during hot water supply or bath operation to drive the heating can body 1. The temperature inside is made uniform up and down, and continuous driving is performed until the hot water supply or bath operation is completed to perform stirring.
Since the heating circulation pump 9 is driven during the heating operation, it is possible to prevent the stirring circulation pump 39 from being driven.
Reference numeral 40 denotes an in-machine temperature detection sensor, which is provided in a frame 41 that houses the above-mentioned parts and detects the temperature inside the frame 41.

Reference numeral 42 denotes a ventilation fan, which exhausts the air inside the frame 41 to the outside of the frame 41.
Reference numeral 43 denotes a control board, which is provided in the frame 41 to operate each circuit, control combustion of the burner portion 2, stop when an abnormality occurs, ventilate the air in the frame 41, and the like.
Reference numeral 44 denotes a substrate atmosphere temperature detection sensor, which is provided in the vicinity of the control board 43 and detects the temperature of the air around the control board 43.

Next, the operation of this embodiment will be described.
First, to explain the heating operation, the can body temperature sensor 14 detects the temperature inside the heating can body 1, and when this temperature is a high temperature heating load, it is about 80 ° C., and when it is a low temperature heating load, it is about 60 ° C. While controlling the combustion of the burner unit 2 so as to be, the heating circulation pump 9 is driven to transfer the hot water, the circulating liquid, the antifreeze liquid, or the like which has become hot in the heating can body 1 to the heating radiator 7. The room is heated by the heating radiator 7 by repeating the circulation of distribution and returning to the heating can body 1.

Next, in the hot water supply operation, since the inside of the heating can body 1 is already hot when the heating operation is performed, the low temperature water from the water supply pipe 15 is immediately used for hot water supply when the hot water supply plug 18 is opened. At the same time that the heat exchanger 4 is indirectly heated by the high-temperature heat medium in the heating can body 1, the hot water in the lower part of the can body 1 is driven through the communication pipe 38 by driving the circulation pump 39 for stirring. Hot water of a desired temperature is supplied by supplying it to the upper part and stirring the heating can body 1 to eliminate the temperature difference between the upper and lower parts in the heating can body 1 so that heat exchange can always be performed with the same heat exchange efficiency. It is a thing.

Next, in bath operation, when there is a request to boil water in the bath 26 such as turning on the bath heat retention switch of a remote control (not shown), the circulation pump 29 for bath is driven to exchange heat in the bath 26 for heat. It is circulated in the vessel 5 and heated by the heat medium in the heating can body 1 held at a high temperature to reheat or keep the hot water in the bath 26 at a desired temperature. The bath temperature sensor 31 Is automatically stopped when it detects a desired temperature.

Next, in the antifreeze operation in the bath circuit C, when the outside air temperature drops and the temperature inside the frame 41 drops and the in-flight temperature detection sensor 40 detects less than 0 ° C., the bath circulation pump 29 is always turned on and driven. At the same time, the antifreeze heater 37 for bath piping is always turned on to keep the power on.

Then, when the detection temperature of the in-flight temperature detection sensor 40 detects a temperature higher than 5 ° C., the bath circulation pump 29 is constantly turned off and stopped, and the antifreeze heater 37 for bath piping is constantly turned off to be in a non-energized state. Then, the antifreeze operation is terminated.

Next, the in-machine cooling operation will be described according to the flowchart shown in FIG. 2. First, when the operation switch is turned on (S1), the control board 43 sets the target boiling temperature of the heating can body 1 to 85 ° C., which is the normal set temperature. After setting (S2), the combustion operation of the burner unit 2 is started. (S3)

Next, it is determined whether the detection temperature of the machine temperature detection sensor 40 is the heat resistant temperature of the control board 43, for example, 60 ° C. or higher (S4), and the detection temperature of the machine temperature detection sensor 40 is 60 ° C. or higher, which is the heat resistant temperature of the control board 43. At this time, it is determined that the in-flight cooling operation is necessary, and the ventilation fan 42 is turned on to start the in-flight cooling operation in which the air inside the frame 41 is exhausted to the outside of the frame 41. (S5)

Then, a timer (not shown) in the control board 43 is started (S6), and when the time counting time of the timer elapses for a predetermined time, for example, 10 minutes (S7), the detection temperature of the in-flight temperature detection sensor 40 is 60 ° C. or higher again. (S8), when the detection temperature of the in-flight temperature detection sensor 40 is 60 ° C. or higher, it is determined that an abnormality has occurred in which the temperature inside the frame 41 cannot be lowered by the in-flight cooling operation by the ventilation fan 42 (S8). S9), the combustion operation of the burner unit 2 is stopped (S10), and the occurrence of an abnormality is displayed on the display unit (not shown) of the operation unit (not shown) to notify the abnormality. (S11)

Further, when the detection temperature of the in-flight temperature detection sensor 40 is less than 60 ° C. in (S8), it is determined whether the detection temperature of the in-flight temperature detection sensor 40 is the temperature after cooling in the machine, for example, less than 50 ° C. (S12), and the detection temperature. If the temperature is 50 ° C. or higher, the temperature returns to (S8), and if the detected temperature is less than 50 ° C., it is determined that the in-flight cooling is completed, and the ventilation fan 42 is stopped to end the in-flight cooling operation. (S13)

The temperature after cooling the inside of the machine is a temperature that decreases when the ventilation fan 42 is turned on in the inside cooling operation and the air inside the frame 41 is exhausted to the outside of the frame 41. Since the ° C. temperature drops, the temperature after in-flight cooling is set to 50 ° C., which is 10 ° C. lower than 60 ° C., which is the determination temperature for starting or not starting the in-flight cooling operation.

Next, after stopping the ventilation fan in (S13) to end the in-flight cooling operation, or in (S4) when the detection temperature of the in-flight temperature detection sensor 40 is less than 60 ° C., which is the heat resistant temperature of the control board 43, the substrate atmosphere temperature. It is determined whether the detection temperature of the detection sensor 44 is the heat resistant temperature of the control board 43, for example, 60 ° C. or higher (S14), and when the detection temperature of the board atmosphere temperature detection sensor 44 is less than 60 ° C., it returns to (S4) and the detection temperature is detected. When the temperature is 60 ° C. or higher, it is determined that an abnormality has occurred that the ventilation fan 42 is out of order and the in-flight cooling operation is not performed normally (S15), and heating is performed to lower the temperature inside the frame 41. The target boiling temperature of the can body 1 is set from the normal set temperature of 85 ° C to the set temperature of 75 ° C when the ventilation fan fails. (S16)

Then, a timer (not shown) in the control board 43 is started (S17), and when the time counting time of the timer elapses for a predetermined time, for example, 10 minutes (S18), the detection temperature of the board atmosphere temperature detection sensor 44 is again set to the control board. It is determined whether the heat resistant temperature of 43 is 60 ° C. or higher (S19), and when the detection temperature of the substrate atmosphere temperature detection sensor 44 is 60 ° C. or higher, the target boiling temperature of the heating can body 1 is lowered to the set temperature when the ventilation fan fails. However, the temperature inside the frame 41 cannot be lowered, and it is determined that the control board 43 is damaged as it is, and the process returns to (S9).

Further, when the detection temperature of the substrate atmosphere temperature detection sensor 44 is less than 60 ° C. in (S19), it is determined whether the detection temperature of the substrate atmosphere temperature detection sensor 44 is the temperature after cooling in the machine, for example, less than 50 ° C. (S20). If the detection temperature is 50 ° C or higher, it may reach 60 ° C or higher again, so return to (S19). If the detection temperature is less than 50 ° C, set the target boiling temperature of the heating can body 1 when the ventilation fan fails. If the temperature is lowered, the temperature inside the frame 41 does not become the temperature at which the control board 43 is damaged, and it is determined that the combustion operation can be performed as it is, and the process returns to (S4).

As described above, the in-flight cooling operation by the ventilation fan 42 is controlled by the detection temperature of the in-flight temperature detection sensor 40, and the failure determination of the ventilation fan 42 is determined by the detection temperature of the substrate atmosphere temperature detection sensor 44 provided in the vicinity of the control board 43. Therefore, even if the in-flight temperature detection sensor 40 fails, the substrate atmosphere temperature detection sensor 44 detects the ambient temperature of the control substrate 43 and lowers the target boiling temperature of the heating can body 1, but the substrate atmosphere temperature detection sensor 44 still works. When the high temperature is detected, it is determined that an abnormality has occurred and the combustion operation of the burner unit 2 is stopped. Therefore, even if the in-machine temperature detection sensor 40 fails, the control board 43 can be prevented from failing due to heat. The substrate atmosphere temperature detection sensor 44 detects the ambient temperature of the control substrate 43 and controls to lower the target boiling temperature of the heating can body 1, so that the control substrate 43 does not stop immediately even if the ambient temperature is high. It can reduce the deterioration of usability.

Further, even if the substrate atmosphere temperature detection sensor 44 fails, if the in-flight temperature detection sensor 40 detects the high temperature in the machine and performs the in-flight cooling operation by the ventilation fan 42, and the in-flight temperature detection sensor 40 still detects the high temperature, an abnormality occurs. Since the combustion operation of the burner unit 2 is stopped, it is possible to prevent the control board 43 from failing due to heat even if the board atmosphere temperature detection sensor 44 fails.

Further, since the failure determination of the ventilation fan 42 is performed based on the detection temperature of the substrate atmosphere temperature detection sensor 44 that detects the ambient temperature of the control board 43, a dedicated detection means for determining the failure of the ventilation fan 42 becomes unnecessary, and the cost increases. It is possible to determine the failure of the ventilation fan 42 without any trouble.

Although this embodiment has been described with a 1-can 3-circuit type hot water supply device, the present invention is not limited to this, and the frame 41 has a can body for storing high-temperature heat medium and hot water, and the control board 43 is mounted on the frame 41. Anything may be provided as long as it is provided inside and the in-machine cooling operation inside the frame 41 is performed by the ventilation fan 42.

1 Can body 2 Burner part 40 In-flight temperature detection sensor 41 Frame body 42 Ventilation fan 43 Control board 44 Board atmosphere temperature detection sensor

Claims (2)

A burner unit, a can body inside of the heat medium in the combustion of the burner unit is heated, a frame body provided with said can body and said burner portion therein, internal temperature for detecting the temperature of the frame body a detection sensor, a control board provided in the frame body, provided in the vicinity of the control substrate, and the substrate an ambient temperature detection sensor for detecting the temperature of air around the control board, to ventilate the air of the frame body In a combustion device equipped with a ventilation fan, the control board heats the heat medium inside by burning the burner portion to a target boiling temperature initially set , and detects by the in-flight temperature detection sensor. The ventilation fan is operated according to the temperature to perform the in-flight cooling operation, and when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than the predetermined temperature, it is determined that an abnormality has occurred, and the target boiling temperature is initially set. A combustion device characterized by resetting to a temperature lower than the specified temperature. The control board, after resetting the target boiling temperature, when the temperature of the substrate ambient temperature detection sensor detects is equal to or higher than the predetermined temperature, to stop the operation determines that the exhaust fan is faulty, abnormal The combustion apparatus according to claim 1 , wherein the combustion apparatus is characterized in that.

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