JP2019052813A - Combustion apparatus - Google Patents

Abstract

To provide a combustion apparatus capable of preventing a control substrate in a frame body from being broken due to heat.SOLUTION: A combustion apparatus includes in a frame body 41: a burner section 2; a can body 1; an apparatus inner temperature detection sensor 40 for detecting a temperature in the frame body 41; a control substrate 43; a substrate atmosphere temperature detection sensor 44 provided in the vicinity of the control substrate 43; and a ventilator 42. Based on a temperature detected by the apparatus inner temperature detection sensor 40, the ventilator 42 is operated to perform an apparatus inner cooling operation. When the temperature detected by the substrate atmosphere temperature detection sensor 44 is a predetermined temperature or higher, occurrence of an abnormality is determined. Thus, even if the apparatus inner temperature detection sensor 40 is broken, a peripheral temperature of the control substrate 43 is detected by the substrate atmosphere temperature detection sensor 44 to determine occurrence of an abnormality. Therefore, even if the apparatus inner temperature detection sensor 40 is broken, this configuration can prevent the control substrate 43 from being broken due to heat.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, this type of equipment has a hot water supply heat exchanger and a bath heat exchanger in the can in which the heat medium for heating is stored. It was a good one. (For example, refer to Patent Document 1.)

  In addition, when an abnormality such as a fin clogging in the heat exchanger occurs, the temperature of the air inside the frame rises, and components such as a control device composed of a substrate housed in the frame are exposed to high temperatures. Therefore, an in-machine 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-machine temperature When the temperature detected by the thermistor exceeds the upper limit temperature, the combustion of the burner is stopped, the air supply fan is driven, and the in-machine cooling operation for driving the circulation pump is executed. (For example, see Patent Document 2.)

JP 2001-65884 A JP-A-2006-118321

  By the way, in this conventional system, when the temperature detected by the in-machine temperature thermistor exceeds the upper limit temperature, the air supply fan is driven to perform the in-machine cooling operation. However, a hot heat medium or hot water is put into the can body. In the case of storing hot water and installing a heat exchanger that exchanges heat with the high-temperature heat medium or hot water in the can body to recharge hot water, heating, or bath, provide a ventilation fan for cooling the inside of the frame However, in this case, even if the ventilation fan fails, it cannot be detected, the temperature inside the frame rises and becomes high, and the control board inside the frame There was a problem of failure.

  In order to solve the above-mentioned problem, in claim 1 of the present invention, a burner part, a can body in which an inner heat medium is heated by combustion of the burner part, and the burner part and the can body are provided inside. Frame, an in-machine temperature detection sensor for detecting the temperature inside the frame, a control board provided in the frame, and a substrate atmosphere provided near the control board for detecting the temperature of air around the control board In the combustion apparatus including a temperature detection sensor and a ventilation fan for ventilating the air in the frame body, the control board operates the ventilation fan according to the temperature detected by the in-machine temperature detection sensor to perform an in-machine cooling operation. In addition, when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than a predetermined temperature, it is determined that an abnormality has occurred.

  According to a second aspect of the present invention, the control board heats the inner heat medium to the initially set target boiling temperature by combustion of the burner section, and the temperature detected by the board atmosphere temperature detection sensor is a predetermined temperature. At the above time, the target boiling temperature is reset to a temperature lower than the initially set temperature.

  According to a third aspect of the present invention, the control board determines that the ventilation fan has failed when the temperature detected by the board atmosphere temperature detection sensor is equal to or higher than a predetermined temperature after resetting the target boiling temperature. It stops and reports abnormality.

  According to the first aspect of the present invention, the internal cooling operation by the ventilation fan is controlled by the detection temperature of the internal 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-machine temperature detection sensor fails, the substrate ambient temperature detection sensor detects the ambient temperature around the control board and determines that an abnormality has occurred. It is possible to take measures to prevent failure.

  Even if the substrate ambient temperature detection sensor fails, the internal temperature detection sensor detects the internal high temperature and performs the internal cooling operation by the ventilation fan. If the internal temperature detection sensor still detects the high temperature, an abnormality has occurred. Thus, even if the substrate ambient temperature detection sensor fails, it is possible to take measures to prevent the control substrate from being damaged by heat.

  According to the second aspect of the present invention, since the substrate ambient temperature detection sensor detects the ambient temperature of the control board and performs control to lower the target boiling temperature of the heating can body, even if the ambient temperature of the control board is high, immediately The deterioration of usability can be reduced without stopping and without causing the control board to break down due to heat.

  According to claim 3, after resetting the target boiling temperature, when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than a predetermined temperature, it is determined that the ventilation fan has failed and the operation is stopped. Therefore, even if the in-machine temperature detection sensor fails, the substrate ambient temperature detection sensor detects the ambient temperature of the control board and lowers the target boiling temperature of the heating can. If a high temperature is detected, it is judged that an abnormality has occurred that the ventilation fan has failed, and the combustion operation of the burner section is stopped, so that even if the temperature sensor in the machine fails, the control board will fail due to heat. It can be prevented.

  In addition, even if the substrate ambient temperature detection sensor fails, the in-machine temperature detection sensor detects the high temperature inside the machine and performs the internal cooling operation by the ventilation fan, and if the in-machine temperature detection sensor still detects the high temperature, the ventilation fan has failed. Since it is determined that an abnormality has occurred and the combustion operation of the burner unit is stopped, even if the substrate atmosphere temperature detection sensor fails, the control substrate can be prevented from being damaged by heat.

  In addition, since the failure determination of the ventilation fan is performed based on the detected temperature of the substrate ambient temperature detection sensor that detects the ambient temperature of the control substrate, a dedicated detection means for determining the failure of the ventilation fan is not required, and the ventilation fan is not increased in cost. It is possible to make a failure determination.

1 is a schematic configuration diagram of a combustion apparatus with an embodiment of the present invention. The flowchart figure of the same machine inside 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 heating burner section 2 at the lower portion. Inside the can body 1, heat for hot water supply that constitutes a heat exchanger for indirect heating hot water supply by a serpentine tube An exchanger 4 and a bath heat exchanger 5 constituting a heat exchanger for indirect heating bathing using a serpentine tube are arranged up and down to perform hot water heating and hot water supply and bathing either simultaneously or individually. It is something that can be done.

  First, the heating circuit A will be described. 6 is a heating forward pipe, 7 is a heating radiator such as a floor heating panel, 8 is a heating return pipe, 9 is a circulation pump for heating, 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, and 14 is a can body temperature sensor used for temperature control of the heating can body 1. The heating medium heated to the target boiling temperature (85 ° C.) of the body temperature sensor 14 is sent to the heating radiator 7 by the heating circulation pump 9 via the heating forward pipe 6 to perform heating, and the heating radiation. The low-temperature water (about 30 ° C. to 50 ° C.) radiated by the vessel 7 returns to the heating can 1 through the heating return pipe 8 and is heated again to the target boiling temperature and circulated.

  Next, the hot water supply circuit B will be described. 15 is a water supply pipe connected to the water supply, 16 is a flow rate sensor for detecting the flow rate of water, 17 is a hot water supply pipe for discharging hot water heated by the heat exchanger 4 for hot water supply, and 18. Is a hot water tap, 19 is connected to the hot water pipe 17 through the mixing valve 20, and communicates with the hot water pipe 15 and the hot water pipe 17, and 21 is a hot water supply expansion that absorbs thermal expansion when the hot water tap 18 is closed. The tank, 22 is a water supply temperature sensor, and 23 is a hot water supply temperature sensor. When the hot water 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 1 is about 88 ° C. Combustion is performed in the burner unit 2 so as to maintain a high temperature, and 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 is mixed with tap water in the mixing valve 20. Hot water is mixed and adjusted to an appropriate temperature 18 is intended to be hot water from.

  Reference numeral 24 denotes a hot water pipe anti-freezing heater that generates heat when energized and prevents water in the hot water pipe 17 from freezing. Reference numeral 25 denotes a hot water pipe anti-freezing heater that generates heat when energized. The water in the water supply pipe 15 is prevented from freezing.

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

  A hot water filling pipe 32 is branched from the hot water supply pipe 17 of the hot water supply circuit B and is 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 pipe 32 are switched to communicate with each other, the hot water valve 33 is opened, and the hot water heated by the hot water supply heat exchanger 4 is caused to flow into the bath circuit C to be constant to the bath tub 26. The amount of hot water filling is performed.

  Reference numeral 35 denotes a bath circuit three-way valve, which is provided in the bath outlet pipe 27, and is connected to the other end of the bath bypass pipe 36, one end of which is connected between the bath circulation pump 29 of the bath return pipe 28 and the three-way valve 34. It is what.

  37 is an antifreezing heater for bath piping which generates heat when energized and prevents water in the bath circuit from freezing. The heat of the antifreezing heater 37 for bath piping is transferred from the bath outlet tube 27. Provided in the bath outlet tube 27 in the vicinity of the connecting portion between the bath heat exchanger 5 and the bath outlet tube 27, which is a position where heat is transferred to the heat medium in the heating can body 1 through the bath heat exchanger 5. It is what.

Here, 38 is a communication pipe connecting the upper and lower portions of the heating can body 1, and 39 is a stirring circulation pump provided in the middle of the communication pipe 38, which is driven during hot water supply or bath operation. The temperature inside is made uniform up and down, and stirring is continued until the hot water supply or bath operation is completed.
In addition, since the heating circulation pump 9 is driven during the heating operation, it is possible not to drive the stirring circulation pump 39.
Reference numeral 40 denotes an in-machine temperature detection sensor that is provided in a frame body 41 that houses the above-described parts, and detects the temperature in the frame body 41.

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

Next, the operation of this embodiment will be described.
First, the heating operation will be described. The can body temperature sensor 14 detects the temperature in the heating can body 1. When the temperature is a high temperature heating load, the temperature is about 80 ° C., and when the temperature is a low temperature heating load, the temperature is about 60 ° C. The combustion of the burner unit 2 is controlled so that the heating circulation pump 9 is driven, and the heat medium such as hot water, circulating liquid, antifreeze liquid, etc. that has become high temperature in the heating can body 1 is supplied to the heating radiator 7. Circulation is repeated and returned to the heating can 1 again, and the heating radiator 7 is used to heat the room.

  Next, in the hot water supply operation, when the heating operation is being performed, the inside of the heating can 1 is already hot, so if the hot water tap 18 is opened, the low-temperature water from the water supply pipe 15 is immediately used for hot water supply. The heat exchanger 4 is indirectly heated by the high-temperature heat medium in the heating can body 1, and at the same time, the stirring circulation pump 39 is driven and hot water in the lower portion of the can body 1 is connected to the can body 1 through the communication pipe 38. Hot water at a desired temperature is supplied so as to eliminate the temperature difference between the upper and lower sides of the heating can body 1 by supplying to the upper portion and stirring the heating can body 1 so that heat exchange can always be performed with the same heat exchange efficiency. Is.

  Next, in the bath operation, when there is a request to boil the hot water in the bathtub 26, such as turning on a bath heat switch on a remote controller (not shown), the bath circulation pump 29 is driven to exchange the hot water in the bathtub 26 for bath. The bath temperature sensor 31 circulates in the vessel 5 and heats the hot water in the bathtub 26 to a desired temperature or keeps it warm by heating with a heat medium in the heating can 1 held at a high temperature. Is automatically stopped when a desired temperature is detected.

  Next, the freeze prevention operation in the bath circuit C is driven by always turning on the bath circulation pump 29 when the outside air temperature decreases and the temperature in the frame body 41 decreases and the in-machine temperature detection sensor 40 detects less than 0 ° C. At the same time, the bath pipe freezing prevention heater 37 is always turned on and energized.

  When the temperature detected by the in-machine temperature detection sensor 40 detects a temperature higher than 5 ° C., the bath circulation pump 29 is always turned off and stopped, and the bath piping freeze prevention heater 37 is always turned off and is not energized. Thus, the freeze prevention operation is completed.

  Next, the internal cooling operation will be described with reference to the flowchart shown in FIG. 2. When the operation switch is turned on (S1), the control board 43 sets the target boiling temperature of the heating can 1 to the normal set temperature of 85 ° C. Set (S2), the combustion operation of the burner unit 2 is started. (S3)

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

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

  When the detected temperature of the in-machine temperature detection sensor 40 is less than 60 ° C in (S8), it is determined whether the detected temperature of the in-machine temperature detection sensor 40 is a temperature after cooling in the machine, for example, less than 50 ° C (S12). If the detected temperature is less than 50 ° C., it is determined that the in-machine cooling has been completed, the ventilation fan 42 is stopped, and the in-machine cooling operation is terminated. (S13)

  The temperature after cooling in the machine is a temperature that decreases when the ventilation fan 42 is turned on and the air in the frame 41 is exhausted to the outside of the frame 41 during the cooling in the machine. In the present embodiment, the temperature is about 10 in the cooling in the machine. Since the temperature of 0 ° C. decreases, 50 ° C., which is 10 ° C. lower than 60 ° C., which is a temperature for determining whether or not to start the in-machine cooling operation, is set as the post-in-cooling temperature.

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

  Then, a timer (not shown) in the control board 43 is started (S17), and when the time counted by the timer elapses for a predetermined time, for example, 10 minutes (S18), the detection temperature of the substrate ambient 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). When the detected temperature of the substrate atmosphere temperature detection sensor 44 is 60 ° C. or higher, the target boiling temperature of the heating can 1 is lowered to the set temperature when the ventilating fan fails. However, the temperature in the frame body 41 cannot be lowered, and it is determined that the control board 43 is damaged in this state, and the process returns to (S9).

  When the detected temperature of the substrate atmosphere temperature detection sensor 44 is less than 60 ° C. in (S19), it is determined whether the detected temperature of the substrate atmosphere temperature detection sensor 44 is a temperature after cooling in the apparatus, for example, less than 50 ° C. (S20). If the detected temperature is 50 ° C. or higher, there is a possibility that it will be 60 ° C. or higher again (S19). If the detected temperature is lower than 50 ° C., the target boiling temperature of the heating can 1 is set when the ventilator fan fails. If the temperature is lowered, it is determined that the temperature in the frame 41 does not become the temperature at which the control board 43 is damaged, and that the combustion operation is possible as it is, and the process returns to (S4).

  As described above, the in-machine cooling operation by the ventilation fan 42 is controlled by the detected temperature of the in-machine 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-machine temperature detection sensor 40 breaks down, the substrate atmosphere temperature detection sensor 44 detects the ambient temperature of the control board 43 to lower the target boiling temperature of the heating can 1, and the substrate atmosphere temperature detection sensor 44 still If a high temperature is detected, it is determined that an abnormality has occurred, and the combustion operation of the burner unit 2 is stopped. The substrate ambient temperature detection sensor 44 detects the ambient temperature of the control board 43 and performs control to lower the target boiling temperature of the heating can body 1, thereby Temperature does not stop immediately even at high temperatures, but capable of reducing the deterioration of the usability.

  Even if the substrate ambient temperature detection sensor 44 breaks down, the in-machine temperature detection sensor 40 detects the high temperature inside the machine and performs the in-machine cooling operation by the ventilation fan 42. If the in-machine temperature detection sensor 40 still detects the high temperature, an abnormality occurs. Since the combustion operation of the burner unit 2 is stopped by determining that the control substrate 43 has failed, the control substrate 43 can be prevented from being damaged by heat even if the substrate atmosphere temperature detection sensor 44 fails.

  Further, since the failure determination of the ventilation fan 42 is performed based on the temperature detected by the substrate ambient temperature detection sensor 44 that detects the ambient temperature of the control substrate 43, a dedicated detection means for determining the failure of the ventilation fan 42 is not required, resulting in an increase in cost. Therefore, it is possible to determine the failure of the ventilation fan 42 without any problems.

  In addition, although the present Example demonstrated the 1 can 3 circuit type hot water supply apparatus, it is not limited to this, While having the can body which stores a hot heat medium and hot water in the frame 41, the control board 43 is attached to the frame 41. Any device may be used as long as it is provided inside and performs an in-machine cooling operation in the frame 41 by the ventilation fan 42.

DESCRIPTION OF SYMBOLS 1 Can body 2 Burner part 40 In-machine temperature detection sensor 41 Frame 42 Ventilation fan 43 Control board 44 Substrate atmosphere temperature detection sensor

Claims (3)

  Burner part, can body in which an inner heat medium is heated by combustion of the burner part, a frame body provided with the burner part and the can body, and in-machine temperature detection for detecting the temperature inside the frame body A sensor, a control board provided in the frame, a substrate atmosphere temperature detection sensor provided in the vicinity of the control board for detecting the temperature of air around the control board, and a ventilation fan for ventilating the air in the frame. In the combustion apparatus, the control board operates the ventilation fan according to the temperature detected by the in-machine temperature detection sensor to perform the in-machine cooling operation, and the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than a predetermined temperature. And determining that an abnormality has occurred.   The control board heats the inner heat medium to the initially set target boiling temperature by burning the burner section, and when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than a predetermined temperature, the target heating is performed. 2. The combustion apparatus according to claim 1, wherein the temperature is reset to a temperature lower than the initially set temperature.   After resetting the target boiling temperature, the control board determines that the ventilation fan has failed when the temperature detected by the substrate atmosphere temperature detection sensor is equal to or higher than a predetermined temperature, stops the operation, and reports an abnormality. The combustion apparatus according to claim 2.

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