JP2006226574A - Hot water circulation heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water circulation heating device capable of preventing trouble due to overheating caused by failure of a circulation pump and heating without water caused by deficiency of circulated water. <P>SOLUTION: Combustion capacity is switched from high to low (S8) after the lapse of seven seconds from ignition (S6: YES), temperatures of a heat exchanger between a switching time (time t1) and a time (time t2) after three seconds from switching are compared to judge whether abnormality exists or not (S11). In a case of existence of abnormality (S11: YES), the water is supplied (S19) after extinction of flame (S16) first to try to cope with air bubble or the like. Then the heating device is ignited again (S4), the combustion capacity is switched from high to low (S8), and the abnormality is judged (S11). When the abnormality is eliminated by supplying the water (S11: NO), ordinary combustion control is implemented (S12), and when the abnormality is not eliminated (S11: YES), abnormality in the circulation pump 9 is judged, and the circulation pump 9 is stopped (S20) to perform the processing for abnormality in circulation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water circulation heating apparatus, and more particularly to a hot water circulation heating apparatus that prevents an accident caused by overheating due to a failure of a circulation pump or emptying due to lack of circulating water.

  Conventionally, in a hot water circulation heating device that heats water in a heat exchanger, circulates the heated hot water through a hot water circulation pipe using a circulation pump, and heats the hot water using hot water, Does not circulate or water leaks due to damage to the hot water circulation pipe and the hot water circulation pipe is lacking in hot water. There was a risk that the temperature inside the heat exchanger would rise abnormally. Therefore, in the hot water heater of the invention of Patent Document 1, a water flow switch that detects the flow of water is provided in the heating water circuit to monitor whether water is flowing in the heating water circuit.

Moreover, when the temperature of the hot water discharged from the heat exchanger to the hot water circulation pipe becomes equal to or higher than a predetermined temperature (for example, 85 ° C.) within a predetermined time (for example, 20 seconds) after the start of heating in the heat exchanger. If there is a possibility that the hot water is not circulated, the heating pump is filled with water after the heating is stopped, and when the heating is performed again and the temperature exceeds a predetermined temperature (for example, 85 ° C.), the circulation pump is abnormal. There is also a hot water circulation heating device that is judged to be.
JP 2001-248895 A

  However, in a hot water heater using a water flow switch as in the invention described in Patent Document 1, the water flow switch fails or the water flow switch does not operate normally because dust or the like is caught in the vicinity of the water flow switch. In such a case, there is a problem that an abnormality in the hot water circulation pipe cannot be detected.

  In the method of measuring the temperature within a predetermined time after the start of heating in the heat exchanger, if the predetermined time is short, there is an abnormality in the hot water circulation pipe when the temperature of the water before heating is low, or the circulation Even if the pump is broken, there is a problem that the temperature does not rise to a predetermined temperature and an abnormality cannot be found. In addition, when the predetermined time is lengthened, the temperature rises to a predetermined temperature when there is an abnormality, but there is a problem that it takes time to find the abnormality and overheats the surrounding members, and there is a risk of breakage. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water circulation heating device that prevents accidents caused by overheating due to a failure of a circulation pump or emptying due to lack of circulating water. To do.

  In order to solve the above-mentioned problem, in the hot water circulation heating device of the invention according to claim 1, while heating the water in the heat exchanger by the heating means, the heated hot water is circulated to the hot water circulation pipe by the circulation pump, A hot water circulation heating device for heating with hot water, wherein the temperature measuring means for measuring the temperature in the heat exchanger and the heating amount by the heating means are changed to a state less than the current heating amount, or heating is performed. Based on the temperature transition in the heat exchanger measured by the temperature measuring means after switching the heating state by the heating switching means to stop and switch the heating state, the state of the hot water circulation pipe Or an abnormality determining means for determining whether or not the state of the circulating pump is abnormal, and when the abnormality determining means determines that the abnormality is abnormal, the hot water circulation heating device is operated safely. Has a structure characterized by comprising an abnormality processing means.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 2, in addition to the configuration of the invention of claim 1, the abnormality determination means is provided by the temperature measurement means when the heating state is switched or immediately before or immediately after. The temperature transition in the heat exchanger is detected based on the measured first temperature and the second temperature measured by the temperature measuring means after a predetermined time has passed since the heating state was switched. It has become.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 3, in addition to the configuration of the invention of claim 2, the abnormality determination means is configured so that the temperature change from the first temperature to the second temperature is in a normal range. When it deviates from, it is judged as abnormal.

  Further, in the hot water circulation heating apparatus according to the invention according to claim 4, in addition to the configuration of the invention according to claim 2 or 3, the abnormality determining means is provided when the second temperature is higher than the first temperature. It is the structure characterized by determining that it is abnormal.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 5, in addition to the configuration of the invention according to any one of claims 1 to 4, the heating switching means is configured so that a predetermined time elapses after the heating start by the heating means. It is the structure characterized by switching a heating state.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 6, in addition to the configuration of the invention according to any one of claims 1 to 4, the heating switching means has a temperature in the heat exchanger of a predetermined temperature. It is the structure characterized by switching a heating state when exceeding.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 7, in addition to the configuration of the invention according to any one of claims 1 to 6, the abnormality treatment means stops the heating by stopping the heating by the heating means. Water is added to the circulation pipe, and then heating by the heating means is started, and the heating state is switched again by the heating switching means after a predetermined time has elapsed or after the temperature in the heat exchanger exceeds a predetermined temperature. Thus, the determination by the abnormality determination means is performed, and when it is determined again that the abnormality is present, the hot water circulation heating device is stopped.

  In the hot water circulation heating device of the invention according to claim 1, the temperature measuring means measures the temperature in the heat exchanger, and the heating switching means changes the heating amount by the heating means to a state less than the current heating amount, or Heating can be stopped and the heating state can be switched. And the abnormality determination means is abnormal in the state of the hot water circulation pipe or the state of the circulation pump based on the temperature transition in the heat exchanger measured by the temperature measurement means after switching the heating state by the heating switching means. The abnormality processing means can safely operate the hot water circulation heating device when the abnormality determination means determines that the abnormality is abnormal. Therefore, even if there is an abnormality in the condition of the hot water circulation pipe or the circulation pump and the hot water is not normally circulated through the hot water circulation pipe, the temperature in the heat exchanger will continue to rise, causing an accident. There is no so it is safe.

  In addition, in the hot water circulating heating apparatus of the invention according to claim 2, in addition to the effect of the invention of claim 1, the abnormality determining means is measured by the temperature measuring means when the heating state is switched, immediately before or after. Since the temperature transition in the heat exchanger can be detected based on the first temperature and the second temperature measured by the temperature measuring means after a predetermined time has elapsed after switching the heating state, the temperature transition can be easily performed. Can be detected. Therefore, it is possible to detect a danger that the hot water does not normally circulate through the hot water circulation pipe and the temperature in the heat exchanger continues to rise.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 3, in addition to the effect of the invention according to claim 2, the abnormality determination means has the temperature change from the first temperature to the second temperature deviated from the normal range. In this case, it can be determined as abnormal, so it can be easily determined whether or not it is abnormal. Therefore, it is possible to detect a danger that the hot water does not normally circulate through the hot water circulation pipe and the temperature in the heat exchanger continues to rise.

  Further, in the hot water circulation heating apparatus according to the invention of claim 4, in addition to the effect of the invention of claim 2 or 3, the abnormality judging means judges that the abnormality is present when the second temperature is higher than the first temperature. Therefore, it can be easily determined whether or not it is abnormal.

  Further, in the hot water circulating heating apparatus according to the invention according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 4, the heating switching means is in a heated state after a predetermined time has elapsed after the heating by the heating means. Can be switched. Therefore, if the predetermined time is set as a short time within a few minutes from the start of heating, it is possible to detect that the state of the hot water circulation pipe or the state of the circulation pump is abnormal at the start of heating. Therefore, the hot water circulation heating device can be operated safely, avoiding the danger of the temperature continuously rising. Also, if the predetermined time is set as a long time of several minutes or more, or multiple times are set, the hot water circulates normally at the start of heating, and the state of the hot water circulation pipe or the circulation pump Even if the state becomes abnormal, it is possible to detect it and avoid the danger of the temperature in the heat exchanger continuing to rise, and the hot water circulation heating device can be used safely.

  Further, in the hot water circulation heating apparatus according to the invention of claim 6, in addition to the effect of the invention of any one of claims 1 to 4, the heating switching means has a temperature in the heat exchanger exceeding a predetermined temperature. Since the heating state can be switched at this time, the abnormality can be determined after the temperature of the water in the hot water circulation pipe has sufficiently increased. Therefore, even when the temperature of water at the start of heating is low, an appropriate abnormality determination can be made.

  Moreover, in the hot water circulation heating apparatus of the invention according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 6, the abnormality treatment means stops the heating by the heating means and then turns to the hot water circulation pipe. After the predetermined time has elapsed or after the temperature in the heat exchanger exceeds the predetermined temperature, the heating state is switched again by the heating switching means, and the judgment by the abnormality judging means is performed. If it is determined that the abnormality is again, the hot water circulation heating device can be stopped. Therefore, it is not possible to circulate hot water in the hot water circulation pipe due to failure of the circulation pump itself, but it is a temporary stoppage of the circulation pump due to air biting etc. and it is possible to circulate hot water by performing water filling once Even when an abnormality is detected, the hot water circulation device can be used safely without stopping the hot water circulation heating device. If hot water circulation is not performed normally even after water filling, the hot water circulation heating device is stopped, thus avoiding the danger of the temperature in the heat exchanger continuing to rise and safely circulating hot water. The device can be used.

  Hereinafter, a hot water heating apparatus which is a hot water circulation heating apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a hot water heater 1 according to the present embodiment. The hot water heater 1 supplies hot water into a radiator 2 that is a hot air heater. The radiator 2 obtains thermal energy from the supplied hot water and sends out hot air.

  As shown in FIG. 1, a hot water circulation pipe 22 (a supply hot water circulation pipe 22a, an outgoing hot water circulation pipe 22b, a return hot water circulation pipe 22c, and a bypass 22d) is provided inside the hot water heating apparatus 1. Water stored in the expansion tank 10 is supplied to the heat exchanger 5 in the combustion chamber 3 through the supply hot water circulation pipe 22a. The supply hot water circulation pipe 22 a is provided with a circulation pump 9 that adjusts the amount of water that is supplied from the expansion tank 10 to the heat exchanger 5, that is, circulates through the hot water circulation pipe 22. The combustion chamber 3 provided with the heat exchanger 5 is provided with a burner 4, which burns the gas supplied from the gas supply pipe 31 to heat the heat exchanger 5, and the thermal energy is supplied to the supply hot water circulation pipe. The water supplied from 22a is heated. The combustion chamber 3 is ventilated by an exhaust port 34. The burner 4 corresponds to the “heating means”.

  The hot water heated by the heat exchanger 5 is supplied to the radiator 2 through the outgoing hot water circulation pipe 22b. Then, the hot water deprived of heat energy by the radiator 2 returns to the expansion tank 10 through the return hot water circulation pipe 22c. Further, the outgoing hot water circulation pipe 22b and the return hot water circulation pipe 22c are connected by a bypass 22d so that excess hot water supplied to the radiator 2 goes from the hot water circulation pipe 22b to the return hot water circulation pipe 22c. Has been. In addition, a water replenishment unit 11 is attached to the expansion tank 10. Water can be introduced into the replenishing unit 11 from a water supply port 26 attached to a faucet or the like, and water can be supplied into the expansion tank 10 by controlling the water supply electromagnetic valve 12. Further, the expansion tank 10 is provided with a drain port 27, and when the water in the expansion tank 10 exceeds a predetermined amount, it is discharged to the outside.

  A gas source solenoid valve 8, a gas proportional control valve 7, and a gas main valve 6 are provided in the middle of the gas supply pipe 31 and are connected to the controller 41. The controller 41 is a computer having a CPU, a RAM, and a ROM. The controller 41 controls the gas source solenoid valve 8, the gas proportional control valve 7, and the gas main valve 6 to adjust the amount of gas supplied to the burner 4, and to exchange heat. The heating amount of the vessel 5 is controlled. The combustion chamber 3 is also provided with a fan 15, and this fan 15 is also connected to the controller 41. The controller 41 also controls the fan 15 when adjusting the heating amount. The combustion chamber 3 is provided with a device overheat prevention device 14 and is connected to a controller 41. And when the body temperature of the combustion chamber 3 becomes more than a predetermined value, the safety function which stops the heating of the burner 4 is working.

  Further, the controller 41 is also connected to the circulation pump 9, and controls the circulation pump 9 in order to adjust the amount of water circulated through the hot water circulation pipe 22. In addition, a remote controller 42 of the hot water heater 1 and a remote controller 43 of the radiator 2 are connected to the controller 41, and commands such as OFF / ON of each device and temperature setting are accepted.

  Further, the controller 41 is also connected to the water supply electromagnetic valve 12 of the water replenishing unit 11. When the water in the expansion tank 10 is insufficient, the controller 41 controls the water supply electromagnetic valve 12 to supply water from the water replenishing unit 11 to the expansion tank 10. Supply. Further, an antifreeze heater 13 is provided in the middle of the supply pipe 21 of the water refill unit 11, and when the antifreeze instruction is given from the remote controller 42, the antifreeze heater 13 is heated by the control of the controller 41. Thus, the water in the supply pipe 21 is warmed so as not to freeze.

  Further, a thermistor 16 is provided in the vicinity of the heat exchanger 5 of the outgoing hot water circulation pipe 22b so that the outlet temperature of the hot water from the heat exchanger 5 can be measured. The thermistor 16 corresponds to “temperature measuring means”, and the temperature measured by the thermistor 16 is not limited to the detection of the temperature transition of the heat exchanger 5 which is the main part of the present invention, but the temperature management of the hot water. Used for. In addition, since the outlet temperature of the hot water from the heat exchanger 5 detected by the thermistor 16 is correlated with the temperature of the heat exchanger 5, the temperature detected by the thermistor 16 will be referred to as the temperature of the heat exchanger 5 below. It is temperature.

  In the hot water circulation heating device of the present invention, the heating amount is changed to a state less than the current heating amount, or the heating is stopped and the heating state is switched to detect the temperature transition of the hot water in the heat exchanger to The abnormality determination of the state of the circulation pipe 22 or the state of the circulation pump 9 is performed. Therefore, in the present embodiment, as a first example, a hot water heating apparatus 1 that reduces the heating amount of the burner 4 after a predetermined time has elapsed, detects the temperature transition of the heat exchanger 5 by the thermistor 16, and determines an abnormality is described. To do. And as Example 2, the heating water heater 1 which stops heating of the burner 4 after predetermined time progress, detects the temperature transition of the heat exchanger 5 with the thermistor 16, and performs abnormality determination is demonstrated.

[Example 1]
FIG. 2 is a graph showing the temperature transition of the heat exchanger 5 when the heating amount is reduced after a predetermined time has elapsed. The horizontal axis indicates time, the left vertical axis indicates the heating amount, and the right vertical axis indicates the temperature of the heat exchanger 5 measured by the thermistor 16. The solid line graph is a temperature transition graph of the heat exchanger 5 when the state of the hot water circulation pipe 22 and the state of the circulation pump 9 are normal, and the one-dot chain line graph is the state of the hot water circulation pipe 22 or of the circulation pump 9. It is a graph when there is an abnormality in the state and hot water is not circulating. The two-dot chain line graph is a graph showing the amount of heat applied to the heat exchanger 5 by the burner 4.

  In the first embodiment, the burner 4 is ignited at t0 shown in the graph of FIG. 2, and the heating amount is switched at t1. Therefore, the graph of the heating amount is 0 kw until the ignition time t0, and after ignition, the mild ignition is performed, and then the heating amount is constantly heated at 7.26 kw (high capacity). At the time t1, the heating amount is reduced to 3.43 kW (small capacity), which is about half. In the first embodiment, the time from t0 to t1 is 7 seconds.

  The temperature of the heat exchanger 5 is about 15 ° C. until the ignition time t0, but gradually rises after the end of the mild ignition after the ignition time t0 and increases to about 23 ° C. at the time point t1. Here, when the heating amount is reduced to 3.43 kw, when the hot water circulation is normally performed, the water in the hot water circulation pipe 22 is in a cold state immediately after ignition, and the heating amount is reduced. Since the heat energy obtained by the water passing through the heat exchanger 5 is reduced, the rising temperature of the water is also lowered, and the temperature detected by the thermistor 16 is lowered. When the heating is further continued at 3.43 kw, the temperature once lowered starts to rise.

  However, when the hot water circulation is not normally performed, water does not pass through the heat exchanger 5, and thus the water stagnating in the heat exchanger 5 is continuously heated. Even if the heating amount is reduced, the temperature continues to rise.

  Therefore, in the first embodiment, when warm water is normally circulated, the temperature transition is detected by comparing the temperature at the time point t2 before starting the temperature rise again with the temperature at the time point t1. That is, if normal, the temperature of t2 is lower than the temperature of t1, and if abnormal, the temperature of t2 is higher than the temperature of t1. In the first embodiment, the time from t1 to t2 is 3 seconds.

  Here, with reference to the flowchart shown in FIG. 3, the abnormality response in the heating control performed in the controller 41 is demonstrated. FIG. 3 is a flowchart of the heating control according to the first embodiment.

  First, it is determined whether or not a driving instruction has been issued (S1). If the driving instruction is not performed (S1: NO), the driving instruction is repeatedly confirmed until the driving instruction is performed (S1: NO, S1). When an operation instruction is given (S1: YES), the circulating pump 9 is turned on to start operation (S2). Then, the initial value “0” is set in the abnormality occurrence number counter CT (S3), the ignition process for the burner 4 is performed (S4), and the combustion process with a large capacity (for example, 7.26 kw) is performed. (S5). Here, when the burner 4 is ignited, the gas amount is made small (slow ignition), and after the combustion of the burner 4 is stabilized, the heating amount is increased. Then, it is determined whether or not the time point t1 has elapsed (whether or not 7 seconds have elapsed after ignition) (S6). Until the time t1 elapses, the determination of the elapse of time t1 is repeatedly performed, and the elapse of 7 seconds is waited (S6: NO, S6).

  When the time t1 has elapsed (S6: YES), the temperature at that time (time t1) is acquired from the thermistor 16 (S7). Then, it is switched to combustion with a small capacity (for example, 3.43 kW) (S8). Then, it is determined whether or not the time point t2 has elapsed (whether or not 3 seconds have elapsed since switching) (S9). Until the time t2 elapses, the determination of the elapse of time t2 is repeatedly performed, and the elapse of 3 seconds is waited (S9: NO, S9). When the time point t2 has elapsed (S9: YES), the temperature at that time point (time point t2) is acquired from the thermistor 16 (S10). Next, the temperature at time t1 is compared with the temperature at time t2 (S11).

  If the temperature at the time t2 is higher than the temperature at the time t1 (S11: YES), even if the capacity is reduced (even if the heating amount is switched), the temperature of the heat exchanger 5 is not lowered. There is an abnormality in the state of the circulation pipe 22 or the state of the circulation pump 9, and the hot water is not circulated. Accordingly, the burner 4 is turned off (S16), "1" is added to the abnormality occurrence number counter CT, and the abnormality occurrence number counter CT becomes "1" (S17). Since the abnormality occurrence number counter CT is “1” and the number of fire extinguishing times is not the second time (S18: NO), after the circulation pump 9 is stopped (S19), the hot water circulation pipe 22 is filled (S20). In the water filling process, the circulation pump 9 is turned on and operated to supply water from the expansion tank 10 to the hot water circulation pipe 22. As a result, when air enters the circulation pump 9 and water cannot be circulated well (so-called air-engaged state), it returns to normal so that water can circulate in the hot water circulation pipe 22. Become. At this time, if there is not enough water in the hot water circulation pipe 22 and only the water in the expansion tank 10 is insufficient, the water supply electromagnetic valve 12 of the water refill unit 11 is opened and water is supplied from the water supply port 26. Is done.

  And it returns to S4, an ignition process is performed again (S4), and combustion with a sufficient capability is performed (S5). When the time point t1 has elapsed from the reignition (7 seconds have elapsed) (S6: YES), the temperature at that time point (time point t1) is acquired (S7), and the combustion is switched to a combustion with a small capacity (S8). When the time point t2 has elapsed (3 seconds have elapsed since switching) (S9: YES), the temperature at that time point (time point t2) is acquired (S10), and the temperature at time point t1 and the temperature at time point t2 are compared again. (S11).

  Also in the second comparison, if the temperature at the time t2 is higher than the temperature at the time t1 (S11: YES), it means that the hot water in the hot water circulation pipe 22 cannot be circulated even if water filling is performed. Therefore, the burner 4 is turned off (S16), "1" is added to the abnormality occurrence number counter CT, and the abnormality occurrence number counter CT becomes "2" (S17). Since the abnormality occurrence number counter CT is “2” and the number of fire extinguishing times is the second time (S18: YES), the circulation pump 9 is stopped (S21), and circulation abnormality processing (illustrated) for performing circulation abnormality alarm processing, etc. Go out).

  In S11, if the temperature at the time t2 is not higher than the temperature at the time t1 (S11: NO), if the capacity is reduced (when the heating amount is switched), the temperature of the heat exchanger 5 is lowered, and the hot water circulation Since warm water is normally circulated in the pipe 22, normal combustion control is performed (S12). Then, normal combustion control is continued until the fire extinguishing instruction is established (S13: NO, S12). When a fire extinguishing instruction is given (S13: YES), the burner 4 is extinguished (S14), the circulation pump 9 is stopped (S15), and the process returns to S1.

  As described above, after 7 seconds from ignition, the combustion capacity is switched from large to small, and the temperature of the heat exchanger 5 is compared between the switching time (time t1) and 3 seconds (time t2) after switching. Thus, the temperature transition of the heat exchanger 5 due to switching is detected, and it is determined whether or not it is abnormal. And when it is abnormal, water filling is performed after fire extinguishing, and the countermeasure against air biting etc. is tried. Then, ignition is performed again, and the combustion capacity is switched from large to small, and abnormality is determined. If the abnormality is eliminated by water filling, normal combustion control is performed. If the abnormality is not eliminated, it is determined that there is an abnormality in the circulation pump 9 or the hot water circulation pipe 22, the circulation pump 9 is stopped, and the circulation abnormality is detected. Is performed.

  In the first embodiment, the CPU of the controller 41 that performs the process of S8 corresponds to “heating switching means”, the CPU of the controller 41 that performs the process of S11 corresponds to “abnormality determination means”, and S3, S16 to S21. The CPU of the controller 41 that performs the above processing corresponds to “abnormal processing means”.

[Example 2]
Next, Example 2 will be described. FIG. 4 is a graph showing the temperature transition of the heat exchanger 5 when heating is stopped after a predetermined time has elapsed. Similar to the graph of FIG. 2, the horizontal axis indicates time, the left vertical axis indicates the heating amount, and the right vertical axis indicates the temperature of the heat exchanger 5 measured by the thermistor 16. The solid line graph is a temperature transition graph of the heat exchanger 5 when the state of the hot water circulation pipe 22 and the state of the circulation pump 9 are normal, and the one-dot chain line graph is the state of the hot water circulation pipe 22 or of the circulation pump 9. It is a graph when there is an abnormality in the state and hot water is not circulating. The two-dot chain line graph is a graph showing the amount of heat applied to the heat exchanger 5 by the burner 4.

  In Example 2, the burner 4 is ignited at t0 shown in the graph of FIG. 4, and the heating is stopped (switching of the heating amount) at t1. Therefore, the graph of the heating amount is 0 kW until the ignition time t0, and after the ignition, the mild ignition is performed, and the heating amount gradually increases. And after a slow ignition, it is heated uniformly at 7.26 kw (high capacity). And the heating is stopped at the time t1. In the second embodiment, the time from t0 to t1 is 7 seconds.

  Therefore, the temperature of the heat exchanger 5 is about 15 ° C. until the ignition time t0, but gradually increases after the end of the mild ignition after the ignition time t0 and increases to about 23 ° C. at the time point t1. . Here, when the heating is stopped, when the hot water circulation is normally performed, the water in the hot water circulation pipe 22 immediately after ignition is in a cold state, and the heating is stopped in the heat exchanger 5. Since the heat energy obtained by the water passing through is lost, the rising temperature of the water is also lost, and the temperature detected by the thermistor 16 is lowered.

  However, when the hot water circulation is not performed normally, the water does not pass through the heat exchanger 5, so even if the heating is stopped at the time t 1, the water remaining in the heat exchanger 5 is heated by the residual heat. As a result, the temperature continues to rise.

  Therefore, in the second embodiment, the temperature transition is detected by comparing the temperature at the time point t2 before starting the temperature rise again with the temperature at the time point t1 when the hot water is normally circulated. That is, if normal, the temperature of t2 is lower than the temperature of t1, and if abnormal, the temperature of t2 is higher than the temperature of t1. In the second embodiment, the time from t1 to t2 is 3 seconds.

  Here, with reference to the flowchart shown in FIG. 5, the abnormality response in the heating control performed in the controller 41 is demonstrated. FIG. 5 is a flowchart of the heating control according to the second embodiment.

  First, it is determined whether or not a driving instruction has been issued (S31). If the driving instruction is not performed (S31: NO), the driving instruction is repeatedly confirmed until the driving instruction is performed (S31: NO, S31). And if a driving | operation instruction | indication is performed (S31: YES), the circulation pump 9 will be turned ON and operation will be started (S32). Then, the initial value “0” is set in the abnormality occurrence number counter CT (S33), the ignition process for the burner 4 is performed (S34), and the combustion process with a large capacity (for example, 7.26 kw) is performed. (S35). Here, when the burner 4 is ignited, the gas amount is made small (slow ignition), and after the combustion of the burner 4 is stabilized, the heating amount is increased. Then, it is determined whether or not the time point t1 has elapsed (whether or not 7 seconds have elapsed after ignition) (S36). Until the time t1 elapses, the determination of the elapse of time t1 is repeatedly performed, and the elapse of 7 seconds is waited (S36: NO, S36).

  When the time point t1 has elapsed (S36: YES), the temperature at that time point (time point t1) is acquired from the thermistor 16 (S37). Then, the burner 4 is turned off, the heating is stopped, and the heating amount is switched (S38). Then, it is determined whether or not the time point t2 has elapsed (whether 3 seconds have elapsed after switching) (S39). Until the time t2 elapses, the determination of the elapse of time t2 is repeatedly performed, and the elapse of 3 seconds is waited (S39: NO, S9). When the time t2 has elapsed (S39: YES), the temperature at that time (time t2) is acquired from the thermistor 16 (S40). Next, the temperature at time t1 is compared with the temperature at time t2 (S41).

  If the temperature at the time t2 is higher than the temperature at the time t1 (S41: YES), even if the heating is stopped (even if the heating amount is switched), the temperature of the heat exchanger 5 is not lowered. It means that there is an abnormality in the state of the hot water circulation pipe 22 or the state of the circulation pump 9, and the hot water is not circulating. Therefore, “1” is added to the abnormality occurrence counter CT, and the abnormality occurrence counter CT becomes “1” (S47). Since the abnormality occurrence number counter CT is “1” and the number of fire extinguishing times is not the second time (S48: NO), after the circulation pump 9 is stopped (S49), the hot water circulation pipe 22 is filled (S50).

  Then, the process returns to S34, the ignition process is performed again (S34), and the combustion with high capacity is performed (S35). When the time point t1 has elapsed from the reignition (7 seconds have elapsed) (S36: YES), the temperature at that time point (time point t1) is acquired (S37), the burner 4 is turned off, the heating is stopped, and the heating amount is increased. It is switched (S38). When the time point t2 has elapsed (3 seconds have elapsed since switching) (S39: YES), the temperature at that time point (time point t2) is acquired (S40), and the temperature at time point t1 and the temperature at time point t2 are compared again. (S41).

  Also in the second comparison, if the temperature at the time t2 is higher than the temperature at the time t1 (S41: YES), it means that the hot water in the hot water circulation pipe 22 cannot be circulated even if water filling is performed. Therefore, “1” is added to the abnormality occurrence counter CT, and the abnormality occurrence counter CT becomes “2” (S47). Since the abnormality occurrence number counter CT is “2” and the number of fire extinguishing times is the second time (S48: YES), the circulation pump 9 is stopped (S51), and a circulation abnormality process (illustrated) for performing pump abnormality alarm processing, etc. Go out).

  In S41, if the temperature at the time point t2 is not higher than the temperature at the time point t1 (S41: NO), when the combustion is stopped (when the heating amount is switched), the temperature of the heat exchanger 5 is lowered and the hot water circulation Since hot water is normally circulated in the pipe 22, the burner 4 is ignited to perform normal combustion control (S42), and normal combustion control is performed (S43). And normal combustion control is continued until fire extinguishing conditions are satisfied (S44: NO, S43). And if fire extinguishing conditions are satisfied (S44: YES), the burner 4 will be extinguished (S45), the circulation pump 9 will be stopped (S46), and it will return to S31.

  As described above, after ignition, combustion is performed with high capacity, and after 7 seconds, combustion is stopped and the heating amount is switched, and heat exchange is performed after switching to the switching time (time t1) and 3 seconds (time t2). The temperature transition of the heat exchanger 5 due to switching is detected by comparing the temperature of the heat exchanger 5 to determine whether or not it is abnormal. And when it is abnormal, water filling is performed after fire extinguishing, and the countermeasure against air biting etc. is tried. Then, after igniting again and combusting with a large capacity, the combustion is stopped and the amount of heating is switched to make an abnormality determination. If the abnormality is eliminated by water filling, normal combustion control is performed. If the abnormality is not eliminated, it is determined that there is an abnormality in the circulation pump 9 or the hot water circulation pipe 22, the circulation pump 9 is stopped, and the circulation abnormality is detected. Is performed.

  In the second embodiment, the CPU of the controller 41 that performs the process of S38 corresponds to the “heating switching unit”, and the CPU of the controller 41 that performs the process of S41 corresponds to the “abnormality determination unit”. S33, S47 to S51 The CPU of the controller 41 that performs the above processing corresponds to “abnormal processing means”.

  Therefore, in the hot water circulation heating apparatus of the present invention as in the first embodiment and the second embodiment, the state of the hot water circulation pipe 22 is abnormal or the circulation pump 9 is abnormal. When the hot water is not normally circulated, it is possible to avoid heating from being continued and causing the hot water heating apparatus 1 to break down or causing an accident.

  Moreover, in the warm water circulation heating apparatus of the present invention as in the first and second embodiments, the temperature measurement means that is always necessary for the warm water circulation heating apparatus is used, and the state of the warm water circulation pipe or the condition of the circulation pump is abnormal. Therefore, there is no need to install a water flow sensor or the like separately, and the cost can be reduced. Further, in the hot water circulation heating device of the present invention, abnormality determination is made based on the temperature transition regardless of the water temperature in the hot water circulation pipe at the time of ignition, so that the temperature at the time of ignition is low and it takes time to increase the temperature of the water in the hot water circulation pipe. Even in such a case, the abnormality determination is made without waiting for the water temperature to rise, and the devices and members in the combustion chamber 3 are not heated for a long time, so that damage to the devices and members can be suppressed.

  In addition, the hot water circulation heating apparatus of this invention is not limited to above-described embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. The hot water circulation heating device is not limited to the hot water heating device 1 including the radiator 2 which is a hot air heater. The radiator 2 may be a floor heater panel heater, an indoor heater panel heater, or the like, or may be a road heater or a roof heater for melting snow.

  In the first embodiment and the second embodiment, the time point t1 is set to the time point 7 seconds after ignition, and the time point t2 is set to the time point 3 seconds after switching, but this time is not limited thereto. The time point t2 may be at least within the time to rise to the temperature at the time point t1 during normal operation after switching the heating amount.

  In the first and second embodiments, the temperature transition is detected based on whether or not the temperature at the time t2 is higher than the temperature at the time t1, but the method for determining an abnormality based on the temperature transition is not limited thereto. Absent. For example, the difference (temperature change) between the temperature at the time t1 and the temperature at the time t2 may be calculated, and the determination may be made based on whether or not the value is included in a predetermined range (normal range). Further, the inclination of the temperature change from the time point t1 to the time point t2 may be calculated, and the determination may be made based on whether or not the value is included in a predetermined range (normal range). Note that this normal range varies depending on the amount of heating for large and small combustion, the capacity of the heat exchanger, the amount of water in the hot water circulation pipe 22, and the like.

  Further, in the first embodiment, when the heating amount is switched, the heating amount is reduced to such an extent that the temperature of the heat exchanger 5 is lowered, and whether or not the temperature at the time t2 is higher than the temperature at the time t1. Although the temperature of the heat exchanger 5 does not decrease and the amount of heating is reduced so that the rate of temperature increase of the heat exchanger is reduced, the temperature at the time t1 and the temperature at the time t2 are An abnormality determination may be made based on whether or not the difference (temperature change) is smaller than a predetermined value registered in advance. Further, the temperature at the time of ignition is measured, and the temperature increase rate from the temperature at the time of ignition to the temperature at the time point t1 is compared with the rate of temperature increase from the temperature at the time point t1 to the temperature at the time point t2. An abnormality determination may be made based on whether or not the rate of increase in temperature from time t2 to the temperature at time t2 is lower.

  Moreover, in the said Example 1 and Example 2, although t1 time was made into after the predetermined time (7 second) passage after ignition, t1 time is not restricted to this. For example, it is good also as the time of the temperature of the heat exchanger 5 exceeding predetermined temperature (for example, 80 degreeC).

  In the first and second embodiments, the abnormality is detected by switching the heating state after ignition, measuring the temperature, and measuring the temperature after the predetermined time has elapsed. However, the abnormality is detected during normal combustion control. May be performed. In that case, in Example 1, the process of S6-S11 is performed in the normal combustion control of S12, and in Example 2, the process of S36-S41 is performed in the normal combustion control of S43. Here, the time point t1 is a preset time. For example, the time point t1 may be arranged every 10 minutes, such as when 10 minutes have elapsed from the ignition time point and when 10 minutes have elapsed since then. Alternatively, the time point t1 may be arranged according to the time as the time point t1 every hour, with 0 minutes per hour as the time point t1.

  In the first and second embodiments, the abnormality detection is performed twice, and when it is determined to be abnormal for the first time, water is filled and air enters the hot water circulation pipe 22 (so-called air biting). State), the countermeasure is taken when water is not circulated well. However, the safety operation performed by the abnormality processing means is not limited to this, and the circulation pump is used in the first abnormality determination. 9 may be stopped.

  Moreover, in the said Example 1 and Example 2, immediately before switching the heating state of the burner 4 (high capability-> low capability, or high capability-> fire extinction), the temperature of the heat exchanger 5 (" However, the detection timing is not limited to this, and it may be detected at the same time as switching the heating state or immediately after switching the heating state.

  The hot water circulation heating device of the present invention is not limited to a hot water heating device such as a hot air heater or a floor heater in which hot water circulates and transmits thermal energy to a radiator, but the hot water is circulated and the thermal energy of the hot water is The present invention can be applied to various hot water circulation heating devices that supply the devices and objects.

It is a lineblock diagram of warm water heating device 1 of this embodiment. It is a graph which shows the temperature transition of the heat exchanger 5 at the time of reducing heating amount after predetermined time progress. It is a flowchart of the heating control of Example 1. It is a graph which shows the temperature transition of the heat exchanger 5 at the time of stopping heating after progress for predetermined time. It is a flowchart of the heating control of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water heating apparatus 2 Radiator 3 Combustion chamber 4 Burner 5 Heat exchanger 9 Circulation pump 10 Expansion tank 11 Water replenishment unit 16 Thermistor 22 Hot water circulation pipe 22a Supply hot water circulation pipe 22b Forward hot water circulation pipe 22c Return hot water circulation pipe 22d Bypass 41 Controller

Claims (7)

A hot water circulation heating device that circulates heated hot water to a hot water circulation pipe by a circulation pump while heating water in the heat exchanger by a heating pump, and heats the hot water with the hot water,
Temperature measuring means for measuring the temperature in the heat exchanger;
The heating switching means for changing the heating amount by the heating means to a state less than the current heating amount, or switching the heating state by stopping the heating,
Whether the state of the hot water circulation pipe or the state of the circulation pump is abnormal based on the temperature transition in the heat exchanger measured by the temperature measurement means after the heating state is changed by the heating switching means An abnormality determination means for determining whether or not
A hot water circulation heating apparatus comprising: an abnormality processing means for safely operating the hot water circulation heating apparatus when the abnormality judgment means judges that an abnormality has occurred.   The abnormality determining means includes a first temperature measured by the temperature measuring means immediately before or immediately after switching the heating state, and a first temperature measured by the temperature measuring means after a predetermined time has elapsed since the heating state was switched. The hot water circulation heating device according to claim 1, wherein a temperature transition in the heat exchanger is detected based on two temperatures.   The hot water circulation heating apparatus according to claim 2, wherein the abnormality determination unit determines that an abnormality occurs when a temperature change from the first temperature to the second temperature is out of a normal range.   The hot water circulation heating apparatus according to claim 2 or 3, wherein the abnormality determination unit determines that an abnormality occurs when the second temperature is higher than the first temperature.   The hot water circulation heating apparatus according to any one of claims 1 to 4, wherein the heating switching unit switches the heating state after a predetermined time has elapsed since the heating by the heating unit.   The hot water circulation heating apparatus according to any one of claims 1 to 4, wherein the heating switching means switches the heating state when the temperature in the heat exchanger exceeds a predetermined temperature.   The abnormality treatment means performs water filling to the hot water circulation pipe after stopping the heating by the heating means, and then starts heating by the heating means, and after a predetermined time has elapsed or the temperature in the heat exchanger is After a predetermined temperature is exceeded, the heating switching means switches the heating state again and the abnormality determining means makes a determination, and when it is determined again abnormal, the hot water circulation heating device is stopped. The hot water circulation heating apparatus according to any one of claims 1 to 6.

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