JP2018013314A - Heating apparatus - Google Patents

Abstract

An object of the present invention is to provide a heating device capable of reliably detecting an abnormality in a temperature sensor that detects an exhaust temperature. SOLUTION: When heating is turned on and a temperature T1 detected by an exhaust temperature sensor 7 is 70° C. or higher, a controller 30 performs error stop processing. When the temperature T1 detected by the exhaust temperature sensor 7 is not equal to or higher than 70° C. and the temperature T1 detected by the exhaust temperature sensor 7 does not exceed the temperature T2 detected by the inflow water temperature sensor 25, the controller 30 controls the burner 2 10% reduction in combustion due to The controller 30 determines whether the temperature T1 detected by the exhaust temperature sensor 7 exceeds the temperature T2 detected by the inflow water temperature sensor 25 and whether the temperature T1 detected by the exhaust temperature sensor 7 is less than 70°C. judge. If the temperature T1 detected by the exhaust temperature sensor 7 does not exceed the temperature T2 detected by the inflow water temperature sensor 25, or if the temperature T1 detected by the exhaust temperature sensor 7 is not less than 70°C, the controller 30 , perform error stop processing. [Selection drawing] Fig. 2

Description

  The present invention relates to a heating device including a heat exchanger heated by combustion exhaust of a burner.

  The heating device includes a burner, a heat exchanger heated by combustion exhaust of the burner, and a circulation path for circulating hot water heated by the heat exchanger by a circulation pump. A heater installed in the room is provided in the middle of the circulation path. The hot water heated by the heat exchanger circulates in the circulation path provided with the heater, and the room is heated by heat radiation from the heater.

  An exhaust pipe for discharging combustion exhaust gas generated by combustion of the burner to the outside is connected to the heating device. In the heat exchange device described in Patent Document 1, an exhaust temperature sensor (exhaust temperature detecting means) for detecting the temperature inside the exhaust passage (exhaust pipe) is provided. When the exhaust temperature sensor is short-circuited or disconnected, the exhaust temperature sensor cannot normally detect the temperature, and the detected temperature may deviate from the appropriate temperature. In the heat exchange device described in Patent Document 1, when the temperature detected by the exhaust temperature sensor deviates from an appropriate temperature during combustion of the burner, the opening of the gas amount adjustment valve inserted in the gas circuit to the burner is set. The amount of combustion of the throttle and burner is reduced. By performing such control and lowering the temperature of the combustion exhaust gas flowing in the exhaust pipe, a case where the exhaust temperature sensor is short-circuited or disconnected is dealt with.

JP-A-8-226703

  In the heat exchanging device described in Patent Document 1, a case where the exhaust temperature sensor is short-circuited or disconnected is dealt with. However, when the exhaust temperature sensor fails, the output value of the exhaust temperature sensor is predetermined with respect to the actual temperature. There is also an intermediate fault that is output in a state of value deviation. In this intermediate failure, it may be determined that the temperature detected by the exhaust temperature sensor is an appropriate temperature, and in this case, an abnormality of the exhaust temperature sensor cannot be detected.

  This invention is made | formed in view of such a situation, and it aims at providing the heating apparatus which can detect the failure of the temperature sensor which detects discharge | emission temperature reliably.

  The heating device of the present invention includes a circulation path through which a heat medium flows, a heating terminal provided in the middle of the circulation path, and a heat exchanger provided on the upstream side of the heating terminal in the middle of the circulation path. The burner that heats the heat exchanger, the exhaust pipe that discharges the combustion exhaust gas of the burner to the outside, and the heat medium heated by the heat exchanger is circulated to the heating terminal by burning the burner Heating control means for performing heating operation, inflow water temperature detection means for detecting the temperature of the heat medium flowing into the heat exchanger, exhaust temperature detection means for detecting the temperature inside the exhaust pipe downstream, An abnormality detecting means for detecting an abnormality of the exhaust temperature detecting means when the temperature detected by the exhaust temperature detecting means is equal to or lower than the temperature detected by the influent water temperature detecting means during the heating operation; It is characterized by providing.

  According to the present invention, when the exhaust temperature detecting means is operating normally when the burner is burned and the heat medium is heated (for example, 80 ° C.) by the heat exchanger, Combustion exhaust gas from the burner is sent, and the detected temperature in the exhaust temperature detecting means exceeds the detected temperature (for example, 60 ° C.) in the inflow water temperature detecting means flowing into the heat exchanger, for example, about 65 ° C. . Paying attention to this point, when the temperature detected by the exhaust temperature detecting means is lower than the temperature detected by the inflow water temperature detecting means, an abnormality of the exhaust temperature detecting means is detected. Abnormality can be detected. Further, since the temperature difference between the detected temperature (for example, 60 ° C.) at the inflow water temperature detecting means and the detected temperature (for example, 65 ° C.) at the exhaust temperature detecting means is small, there is an abnormality in the exhaust temperature detecting means. In some cases, the temperature detected by the exhaust gas temperature detecting means tends to be lower than the temperature detected by the influent water temperature detecting means, and an abnormality can be detected early.

  And a combustion stopping means for stopping combustion of the burner when the temperature detected by the exhaust temperature detecting means is equal to or higher than a predetermined temperature or when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means. It is preferable.

  According to this configuration, the combustion of the burner is stopped when the temperature detected by the exhaust temperature detecting means is equal to or higher than the predetermined temperature, or when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means. Due to the abnormalities of the means, high-temperature combustion exhaust gas does not flow into the exhaust pipe.For example, even if the exhaust pipe is made of vinyl chloride and has a low heat-resistant temperature, it can be damaged by heating. Can be prevented.

  Furthermore, it is preferable that a combustion amount control means for reducing the combustion amount of the burner by a predetermined amount when the abnormality detection means detects an abnormality of the exhaust gas temperature detection means.

  According to this configuration, when the abnormality detection unit detects an abnormality in the exhaust temperature detection unit, the burner burn amount is decreased by a predetermined amount, so that if the abnormality is temporarily detected, the abnormality determination based on the detected temperature is performed again. If so, it is possible to prevent the abnormality from being detected. Thereby, only a permanent abnormality can be detected.

The system block diagram of the heating apparatus of this embodiment. The flowchart which shows the flow of the process which detects the presence or absence of abnormality of an exhaust temperature sensor.

  As shown in FIG. 1, the heating device 1 includes a burner 2 and a can body 3 in which the burner 2 is built. The can body 3 includes a combustion chamber 3a that houses the burner 2, and an exhaust passage 3b that extends from the combustion chamber 3a and exhausts combustion exhaust gas.

  The combustion chamber 3 a is provided with a spark plug 4 for igniting the burner 2 and a frame rod 5 for detecting the ignition of the burner 2. An exhaust pipe 6 made of, for example, vinyl chloride for discharging combustion exhaust gas to the outside is connected to the downstream end of the exhaust passage 3b. An exhaust temperature sensor 7 for detecting the temperature inside the exhaust passage 3b is provided at the downstream end of the exhaust passage 3b.

  The can body 3 is provided with a combustion fan 8 for supplying combustion air for the burner 2 into the combustion chamber 3a.

  Fuel gas is supplied to the burner 2 through a fuel gas supply pipe 9. The fuel gas supply pipe 9 is provided with an original gas solenoid valve 10 and a gas proportional valve 11 in order from the upstream side. The fuel gas supply pipe 9 is connected to the burner 2 via a burner gas solenoid valve 12.

  A heat exchanger 16 is provided inside the can body 3. The heating device 1 includes a circulation path 19 and a water replenishing electromagnetic valve (not shown) that is connected to a water supply (not shown) and replenishes the circulation path 19 with water. The heat exchanger 16 is connected to a part of the circulation path 19. The heat exchanger 16 absorbs heat from the combustion exhaust gas in the can 3 and heats water flowing through the circulation path 19.

  The circulation path 19 circulates hot water flowing into the heat exchanger 16. The circulation path 19 is provided with a heater 21 installed in the room and a heating pump 22. The driving of the heating pump 22 is controlled by a controller 30 described later.

  By driving the heating pump 22, the hot water circulates through the circulation path 19 through the heater 21, and the room is heated by heat radiation from the heater 21.

  An inflow water temperature sensor 25 that detects the temperature of hot water before flowing into the heat exchanger 16 is provided on the upstream side of the heat exchanger 16 in the circulation path 19. In addition, an outflow water temperature sensor 26 that detects the temperature of the hot water flowing out from the heat exchanger 16 is provided on the downstream side of the heat exchanger 16 in the circulation path 19.

  The operation of the heating device 1 is controlled in an integrated manner by the controller 30. The controller 30 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and controls the operation of the heating device 1 by executing a control program for the heating device 1 held in the memory by the CPU.

  A remote controller 33 for remotely operating the heating device 1 is connected to the controller 30 via a remote control cable 34. The remote controller 33 is provided with a display unit 35 and an operation switch group (not shown) such as a temperature setting switch for setting the heating temperature.

  Detection signals from the frame rod 5, the exhaust gas temperature sensor 7, the inflow water temperature sensor 25, and the outflow water temperature sensor 26 are input to the controller 30. The operation of the ignition plug 4, the combustion fan 8, the original gas solenoid valve 10, the gas proportional valve 11, and the burner gas solenoid valve 12 is controlled by a control signal output from the controller 30.

  The controller 30 starts the heating operation when the remote controller 33 is operated by the user and a signal for starting the heating operation is received from the remote controller 33 while the power is supplied to the heating device 1.

  The controller 30 opens the original gas solenoid valve 10 and the burner gas solenoid valve 12 while the combustion fan 8 is rotated, and drives the spark plug 4 to ignite the burner 2. Thereafter, the controller 30 operates the heating pump 22, so that the heating temperature by the heater 21 becomes the temperature set by the remote controller 33 based on the signals from the inflow water temperature sensor 25 and the outflow water temperature sensor 26. The combustion amount of the burner 2 is adjusted by controlling the operation of the proportional valve 11 and the burner gas electromagnetic valve 12.

  When the remote controller 33 is operated by the user and a signal for stopping heating is received from the remote controller 33, the controller 30 closes the original gas solenoid valve 10 and the burner gas solenoid valve 12 to open the burner 2. The fire is extinguished, the heating pump 22 is stopped, and the heating operation is terminated.

[Exhaust temperature sensor abnormality detection processing during heating operation]
Based on the temperature detected by the exhaust temperature sensor 7, the controller 30 controls the exhaust pipe 6 made of vinyl chloride so that combustion gas having a temperature higher than the heat resistance temperature of the exhaust pipe 6 is not discharged. An abnormality detection process is performed to detect whether there is an abnormality.

  As shown in FIG. 2, the remote controller 33 is operated to turn on the heating (STEP 1). When this heating is on, the controller 30 turns on the heating pump 22, burns the burner 2, and heats the hot water at a heating set temperature (for example, 80 ° C.) corresponding to the heating set temperature. Control combustion.

  The controller 30 determines whether or not the temperature T1 detected by the exhaust temperature sensor 7 is equal to or higher than the heat resistance temperature (for example, 70 ° C.) of the exhaust pipe 6 (STEP 2).

  When the detected temperature T1 detected by the exhaust temperature sensor 7 is equal to or higher than the heat resistance temperature (70 ° C.) of the exhaust pipe 6 (“YES” in STEP 2), the controller 30 detects an error state, and the heating pump 22 Is turned off and an error stop process is performed to stop the combustion of the burner 2 (STEP 3). In this error stop process, it is preferable that the controller 30 displays a comment indicating that the combustion of the burner 2 is stopped on the display unit 35 because combustion exhaust gas having a temperature higher than the heat resistant temperature may flow through the exhaust pipe 6. By this burner combustion stop process, it is possible to prevent combustion exhaust gas having a temperature higher than the heat resistant temperature from flowing into the exhaust pipe 6 and being damaged.

  On the other hand, when the detected temperature T1 at the exhaust temperature sensor 7 is not equal to or higher than the heat resistant temperature (70 ° C.) of the exhaust pipe 6 (“NO” in STEP 2), the controller 30 determines that the detected temperature T1 at the exhaust temperature sensor 7 is Then, it is determined whether or not the temperature T2 detected by the inflow water temperature sensor 25 is exceeded (STEP 4).

  When the detected temperature T1 detected by the exhaust temperature sensor 7 does not exceed the detected temperature T2 detected by the inflow water temperature sensor 25 (“NO” in STEP 4), the controller 30 detects an abnormality in the exhaust temperature sensor 7, and the burner 2 The combustion amount is reduced by a predetermined amount (for example, 10%) (STEP 5). If the detected temperature T1 detected by the exhaust temperature sensor 7 exceeds the detected temperature T2 detected by the inflow water temperature sensor 25 (“YES” in STEP4), STEP2 is performed again.

  After reducing the combustion amount by the burner 2 by 10% (STEP 5), it is determined whether the abnormality that is “NO” in STEP 4 is permanent or temporary due to the temperature sensors 7 and 25. In order to determine, the controller 30 determines that the detected temperature T1 at the exhaust temperature sensor 7 exceeds the detected temperature T2 at the inflow water temperature sensor 25 and the detected temperature T1 at the exhaust temperature sensor 7 is less than 70 ° C. It is determined whether or not there is (STEP 6). In STEP 6, it may be determined only whether or not the detected temperature T1 detected by the exhaust temperature sensor 7 is less than 70 ° C.

  When the abnormality that is “NO” in STEP 4 is temporary, the detected temperature T1 of the exhaust temperature sensor 7 exceeds the detected temperature T2 of the inflow water temperature sensor 25, and the exhaust temperature sensor 7 It is determined that the detected temperature T1 is less than 70 ° C. (“YES” in STEP 6), and the controller 30 stops heating in response to the heating-off operation being performed (“YES” in STEP 7) ( (Step 8). In addition, when heating-off operation is not performed ("NO" in STEP7), STEP6 is performed again. That is, the abnormality that becomes “NO” in STEP 4 is temporary, the detected temperature T1 of the exhaust temperature sensor 7 exceeds the detected temperature T2 of the inflow water temperature sensor 25, and the exhaust temperature sensor 7 When the detected temperature T1 is less than 70 ° C. (“YES” in STEP 6) and the heating-off operation is not performed (“NO” in STEP 7), the heating is continuously performed.

  On the other hand, when the abnormality that is “NO” in STEP 4 is permanent due to the temperature sensors 7, 25, the detected temperature T 1 of the exhaust temperature sensor 7 is the detected temperature of the inflow water temperature sensor 25. It is determined that T2 is not exceeded (for example, T1 is 40 ° C., T2 is 55 ° C.) or that the detected temperature T1 in the exhaust temperature sensor 7 is not less than 70 ° C. (“NO” in STEP 6) The controller 30 performs an error stop process (STEP 3). Note that STEP5 to STEP8 may be deleted, and STEP3 (error stop) may be performed when “NO” in STEP4. Further, STEP2 may be deleted.

  In the present embodiment, when the exhaust temperature sensor 7 operates normally and the temperature T1 detected by the exhaust temperature sensor 7 is not equal to or higher than the heat resistance temperature (70 ° C.) of the exhaust pipe 6 (“NO” in STEP 2). The detected temperature T1 at the exhaust temperature sensor 7 is about 65 ° C., and the detected temperature T2 at the inflow water temperature sensor 25 is about 60 ° C. Therefore, it is determined that the detected temperature T1 detected by the exhaust temperature sensor 7 exceeds the detected temperature T2 detected by the inflow water temperature sensor 25 (“YES” in STEP4), STEP2 is performed again, and thereafter STEP2 and STEP4. Is repeated and heating is continued.

  Even when the detected temperature T1 at the exhaust temperature sensor 7 does not exceed the detected temperature T2 at the inflow water temperature sensor 25 (“NO” in STEP 4), the exhaust temperature sensor 7 or the inflow water temperature sensor 25 becomes abnormal. Whether it is a permanent abnormality detection due to the cause or a temporary abnormality detection due to another factor cannot be immediately determined. For this reason, when it becomes "NO" in STEP4, the controller 30 reduces the combustion amount by the burner 2 10% (STEP5).

  In the present embodiment, a state in which the detected temperature T1 of the exhaust temperature sensor 7 does not exceed the detected temperature T2 of the inflow water temperature sensor 25 (“NO” in STEP 4) is a temporary abnormality detection, and the exhaust temperature sensor 7 is operating normally, when the combustion amount by the burner 2 is lowered by 10% (STEP 5), the detected temperature T1 at the exhaust temperature sensor 7 is about 60 ° C., and the detected temperature T2 at the inflow water temperature sensor 25 is It becomes about 55 ° C. Therefore, it is determined that the detected temperature T1 at the exhaust temperature sensor 7 exceeds the detected temperature T2 at the inflow water temperature sensor 25, and the detected temperature T1 at the exhaust temperature sensor 7 is less than 70 ° C. (in STEP 6) “YES”), when the heating-off operation is not performed (“NO” in STEP 7), the heating is continuously performed.

  On the other hand, if the exhaust temperature sensor 7 is not operating normally (intermediate failure), the detected temperature T1 at the exhaust temperature sensor 7 will be the same even if control (STEP 5) is performed to reduce the combustion amount by the burner 2 by 10%. About 40 ° C. (predetermined intermediate value), the temperature T2 detected by the inflow water temperature sensor 25 is about 55 ° C. For this reason, it is determined that the detected temperature T1 detected by the exhaust temperature sensor 7 does not exceed the detected temperature T2 detected by the inflow water temperature sensor 25 (“NO” in STEP 6), and the controller 30 performs an error stop process (STEP 3). ).

  Thus, if it is determined that the detected temperature T1 detected by the exhaust temperature sensor 7 does not exceed the detected temperature T2 detected by the inflow water temperature sensor 25, the exhaust temperature sensor 7 is not operating normally ( Since an intermediate failure) is detected, an abnormality (intermediate failure) of the exhaust temperature sensor 7 can be easily detected.

  It should be noted that a detected temperature other than the detected temperature T2 at the inflow water temperature sensor 25, for example, the temperature of the combustion air supplied into the combustion chamber 3a (supply temperature) is detected, and the detected temperature T1 at the exhaust temperature sensor 7 is When it is determined that the detected supply air temperature (for example, 25 ° C.) has not been exceeded, it is also conceivable to detect an abnormality (intermediate failure) of the exhaust temperature sensor 7. However, when the exhaust temperature sensor 7 is operating normally, the detected temperature T1 at the exhaust temperature sensor 7 is about 65 ° C, and the difference from the detected supply air temperature (25 ° C) is large (40 ° C). degree). For this reason, even if an abnormality (intermediate failure) occurs in the exhaust temperature sensor 7, it takes time until the detected temperature T1 detected by the exhaust temperature sensor 7 becomes equal to or lower than the detected supply air temperature (25 ° C.). An abnormality of the sensor 7 cannot be detected early.

  In contrast, in this embodiment, when the exhaust temperature sensor 7 is operating normally, the detected temperature T1 at the exhaust temperature sensor 7 is about 65 ° C., and the detected temperature T2 at the inflow water temperature sensor 25 is 60. It is about ° C, and the difference is small (about 5 ° C). As a result, when an abnormality (intermediate failure) occurs in the exhaust temperature sensor 7, the temperature T1 detected by the exhaust temperature sensor 7 is less than or equal to the detection temperature T2 (60 ° C.) detected by the inflow water temperature sensor 25. The time is shorter than that detected using the supply air temperature, and an abnormality can be detected early.

  In the above embodiment, the combustion amount by the burner 2 is reduced by 10% in STEP 5, it is confirmed whether or not there is a temporary abnormality in STEP 6, and “NO” is determined in STEP 6 (determination of permanent abnormality). In this case, the error stop process (STEP 3) is performed. However, the amount of combustion by the burner 2 may be lowered a plurality of times, and confirmation of a temporary abnormality may be performed a plurality of times. In this case, after “NO” is determined in STEP 6, it is determined whether or not the determination has reached a predetermined number of times (for example, 3 times), and if it has not reached 3 times (the first time or the second time). Step 5 is performed again. If the number of times reaches three, an error stop process (STEP 3) is performed. Further, the rate of reduction of the combustion amount is not limited to 10%, and the combustion amount may be reduced. For example, when the combustion amount is set to three stages of large, medium, and small, and the combustion amount is large or medium, The combustion amount may be changed to a small value.

  In the said embodiment, although this invention is implemented to the heating apparatus 1 provided with the one burner 2 and the heat exchanger 16, it comprises two burners and two heat exchangers, and each is separately The present invention can also be implemented in a heating device that is controlled to the above. The present invention can also be implemented in a heating device that distributes hot water to a plurality of heating terminals.

  DESCRIPTION OF SYMBOLS 1 ... Heating device, 2 ... Burner, 3 ... Can body, 3a ... Combustion chamber, 3b ... Exhaust path, 6 ... Exhaust pipe, 7 ... Exhaust temperature sensor, 16 ... Heat exchanger, 19 ... Circulation path, 25 ... Inflow water Temperature sensor, 30 ... Controller

Claims (3)

A circulation path through which the heat medium flows;
A heating terminal provided in the middle of the circulation path;
A heat exchanger provided on the upstream side of the heating terminal in the middle of the circulation path;
A burner for heating the heat exchanger;
An exhaust pipe for discharging the combustion exhaust gas of the burner to the outside;
A heating control means for performing a heating operation for circulating the heating medium heated by the heat exchanger to the heating terminal by burning the burner;
Inflow water temperature detection means for detecting the temperature of the heat medium flowing into the heat exchanger;
Exhaust temperature detection means for detecting the temperature inside the exhaust pipe downstream;
An abnormality detecting means for detecting an abnormality of the exhaust temperature detecting means when the temperature detected by the exhaust temperature detecting means is equal to or lower than the temperature detected by the influent water temperature detecting means during the heating operation;
A heating apparatus comprising: The heating device according to claim 1, wherein
A combustion stop means for stopping combustion of the burner when the temperature detected by the exhaust temperature detection means is equal to or higher than a predetermined temperature, or when the abnormality detection means detects an abnormality of the exhaust temperature detection means; Heating device characterized. The heating device according to claim 1, wherein
A heating apparatus comprising: a combustion amount control means for reducing a combustion amount of the burner by a predetermined amount when the abnormality detection means detects an abnormality of the exhaust temperature detection means.