JP4491734B2 - Freezing prevention device, heat source device, and heat consumption system - Google Patents

Description

  The present invention relates to an antifreezing device for preventing freezing of a liquid flow path connecting between a heat source device and a heat consuming device, a heat source device including the antifreezing device, and a heat consuming system.

Conventionally, as in a heat source device disclosed in Patent Document 1 below, there is a device provided with a temperature sensor in the device and provided with a heating means such as a heater that operates based on a temperature detected by the temperature sensor. . In this type of heat source device, the heating means attached to the liquid flow path is operated on the condition that the temperature detected by the temperature sensor is lower than the temperature at which the liquid such as hot water may freeze, and freezing in the device is performed. It is set as the structure which prevents generation | occurrence | production of this.
JP 2001-272101 A

  In the prior art, the heat source device is installed indoors, and a liquid flow path connecting the heat source device and a heat consuming device such as a bath is taken out outdoors and used in a state of passing under the floor. Therefore, when the heat source device is used in such an installation state, when water flow in the liquid flow path is stopped, a liquid such as hot water is likely to stay in a portion (retention portion) arranged under the floor.

  As described above, in the middle of the liquid flow path, there is a stagnant part where liquid such as hot water is likely to stagnate when liquid flow is stopped, and this stagnant part exists in a place where the temperature is lower than the place where the heat source device is installed. In such a case, there is a possibility that the staying portion locally becomes a low temperature. Therefore, as in the prior art, simply detecting the liquid temperature etc. with the temperature sensor provided in the heat source device does not accurately grasp the possibility of freezing in the staying part, and freezing occurs in the staying part or in the vicinity of this. There is a high possibility of

  Therefore, in order to solve the above-described problem, even when there is a staying portion where there is a high possibility that the liquid will stay when the liquid flow is stopped in the liquid flow path, it is possible to prevent the freezing of the liquid in the staying portion. It is an object of the present invention to provide a device, a heat source device including the antifreezing device, and a heat consumption system.

  The invention according to claim 1, which is provided based on such knowledge, connects between the heat source device and the heat consuming device, and supplies the heat energy generated in the heat source device to the heat consuming device via the liquid. An anti-freezing device for preventing freezing of the liquid flow path, wherein the liquid flow path is stopped when the liquid flow in the liquid flow path stops in the middle of the liquid flow path, and a heat source device A flow path part in the apparatus disposed inside, and the staying part is disposed in a place where the temperature is assumed to be lower than the installation atmosphere of the heat source apparatus, and the heat source side in or near the heat source apparatus Temperature detection means and a heat source side heating means capable of heating the in-apparatus flow path section or the vicinity of the in-apparatus flow path section are provided. And said staying part or stagnation A staying portion heating means for heating the vicinity of the heating portion, and when the heat source side heating means is substantially stopped from passing through the liquid flow path, the heat source side temperature detecting means is The detection temperature of the stay side temperature detecting means is below a predetermined stay side threshold temperature in a state where liquid passage in the liquid flow path is substantially stopped. And / or on the condition that the detected temperature detected by the heat source side temperature detecting means is equal to or lower than the heat source side threshold temperature, with the heating by the heat source side heating means being stopped, Either or both of the warming operation of the staying portion by means and the liquid passing operation for flowing the liquid into the liquid flow path can be performed, and the staying side threshold temperature and the operating threshold temperature are equal to or higher than the freezing temperature of the liquid. Is set to The source-side threshold temperature is the freeze prevention device, characterized in that it is set to operate threshold temperature or higher.

  According to such a configuration, it is possible to accurately grasp the possibility of freezing in the staying portion, and to prevent the liquid from freezing by performing the heating operation and the liquid passing operation of the staying portion. Therefore, according to the antifreezing device of the present invention, it is possible to reliably prevent the liquid in the staying portion from freezing even when the staying portion and the vicinity thereof are locally low in temperature.

  Here, in the present specification, “the state in which the liquid passage in the liquid channel is substantially stopped” means that in the liquid channel, in addition to the case where the liquid passage is completely stopped in the liquid channel. This is a concept including a case where the liquid passing speed is slow to a certain degree even when there is a liquid passing, and a case where the liquid passing amount is small.

  According to a second aspect of the present invention, the liquid flow path for connecting the heat source device and the heat consuming device and supplying the heat energy generated in the heat source device to the heat consuming device via the liquid is frozen. An anti-freezing device for preventing, in the middle of the liquid flow path, disposed inside the heat source device and a staying portion where the liquid is supposed to stay when the flow of the liquid in the liquid flow path stops A heat source side heating means capable of heating the heat source side temperature detecting means and the flow path portion in the apparatus or the vicinity of the flow path portion in the apparatus. A retention portion temperature detecting means and a retention portion heating means for heating the retention portion or the vicinity of the retention portion, and a liquid flow path. In the state where the liquid flow in The detection temperature detected by the heat source side temperature detection means is equal to or higher than a predetermined heat source side threshold temperature, and the detection temperature of the retention side temperature detection means is lower than the predetermined retention side threshold temperature. One or both of the heating operation of the staying part by the staying part heating means and the liquid passing operation for flowing the liquid into the liquid channel can be performed in a state where the heating by the heating means is stopped. The anti-freezing device.

  When the detection temperature detected by the heat source side temperature detection means is equal to or higher than the heat source side threshold temperature and the detection temperature of the residence side temperature detection means is less than a predetermined residence side threshold temperature, While the heating by the heat source side heating means is stopped, the staying part warming operation by the staying part heating means and the liquid flow operation for flowing the liquid into the liquid flow path are carried out to prevent freezing of the liquid in the staying part Is done. Therefore, the antifreezing device of the present invention is arranged in a position where the staying portion is assumed to be lower in temperature than the installation atmosphere of the heat source device, and even if the liquid stays in the staying portion when the liquid flow is stopped, the liquid in the staying portion Can be prevented from freezing. Therefore, the antifreezing device of the present invention can reliably prevent freezing of the liquid in the staying portion even when used in a situation where the staying portion is provided at a temperature lower than the installation location of the heat source device. .

  As described above, the antifreezing device of the present invention performs heating of the staying part or liquid passing operation when there is a risk of freezing in the staying part or in the vicinity thereof. Not done. Therefore, according to the antifreezing device of the present invention, the heat source side heating means does not operate more than necessary, which can contribute to energy saving.

  The antifreezing device according to the first or second aspect of the invention can be suitably used when the staying portion is a portion arranged in a position lower than the installation position of the heat source device and the heat consuming device in the liquid flow path. (Claim 3)

  In the case where the staying portion exists in the place as described above, when liquid flow in the liquid channel stops, liquid such as hot water or a heat medium preferentially stays in the staying portion, and there is a high possibility of causing freezing. Therefore, according to the present invention, it is possible to prevent freezing even when a staying portion exists in a portion of the liquid flow path that is disposed at a position lower than the installation position of the heat source device and the heat consuming device. it can.

  Here, as described above, when there is a drooping portion that hangs downward with respect to the heat source device or the heat consuming device in the liquid flow path, the liquid is retained in the staying portion bent with respect to the drooping portion when the liquid flow is stopped Is likely to remain. Therefore, when the liquid flow path has the shape as described above, there is a high possibility that freezing will occur in the stay portion as compared with other parts.

  Accordingly, in the invention according to claim 4 provided based on such knowledge, the liquid flow path has a hanging portion extending downward with respect to the heat source device and the heat consuming device, and the staying portion is in the hanging portion. The anti-freezing device according to any one of claims 1 to 3, wherein the anti-freezing device is a portion bent with respect to the anti-freezing device.

  According to such a configuration, it is possible to prevent the liquid staying in the liquid flow path from freezing even when the staying portion exists.

  Here, when the heat source device and the heat consuming device are installed indoors, the liquid flow path connecting them may be connected through the outdoors such as under the floor of a house. In such a case, the ambient temperature in the place where the staying part is provided is lower than the atmosphere temperature in the place where the heat source device is installed, and there is a possibility that freezing preferentially occurs in the staying part.

  Accordingly, in the invention according to claim 5 provided based on such knowledge, the liquid flow path is a flow path connecting the heat source device and the heat consuming device installed inside the house, and the staying portion is outside the house. The freeze prevention device according to any one of claims 1 to 4, wherein the heat source side threshold temperature is higher than the staying portion side threshold temperature.

  According to such a configuration, it is possible to prevent freezing of the liquid staying in the liquid flow path even when the staying portion exists outdoors.

  In the invention according to claim 6, the liquid channel is formed by a circulation channel that connects the heat source device and the heat consuming device, and the liquid can circulate in the liquid channel by performing the liquid passing operation. The anti-freezing device according to any one of claims 1 to 5, wherein

  In the antifreezing device of the present invention, when the liquid passing operation is performed, the liquid remaining on the heat consuming device side circulates in the liquid flow path. For this reason, the freeze prevention device of the present invention ensures that the liquid flow path is freed when the liquid flow operation is performed in a state where the temperature of the liquid is higher than the temperature at which freezing occurs after use of the heat consuming device. Can be prevented.

  Further, in the antifreezing device of the present invention, the liquid flow path is constituted by a circulation flow path that connects the heat consuming device and the heat source device, so that the liquid flows through the staying part or the like via the heat source device. . For this reason, when a liquid passing operation is performed under conditions such as when heat energy remains on the heat source device side, such as immediately after heating of the liquid in the heat source device, the liquid heated to some extent by the heat energy is liquid. There is a possibility of flowing into the flow path. Therefore, according to the present invention, the thermal energy remaining on the heat source device side can be effectively used for freezing prevention.

  According to the seventh aspect of the invention, the liquid channel is formed by a circulation channel that connects the heat source device and the heat consuming device, and the liquid can be circulated in the liquid channel by the liquid passing operation. 7. The liquid passing operation is preferentially performed as a condition, and the heating operation is performed on the condition that the liquid cannot circulate in the liquid flow path by the liquid passing operation. The antifreezing device described in 1.

  In the antifreezing device of the present invention, when the liquid passing operation is performed, the liquid remaining on the heat consuming device side circulates in the liquid flow path via the heat source device. For this reason, the antifreezing device of the present invention has a thermal energy on the heat source device side in a state where the temperature of the liquid is higher than the temperature at which freezing occurs after use of the heat consuming device or immediately after the liquid heating in the heat source device. When the liquid passing operation is performed under conditions such as remaining, hot water heated to some extent flows through the liquid flow path. Therefore, according to the present invention, the heat energy remaining on the heat source device side and the heat consuming device side can be effectively utilized by performing the liquid passing operation.

  As described above, in the antifreezing device of the present invention, the heat energy remaining on the heat source device side and the heat consuming device side can be effectively utilized by performing the liquid passing operation, so the heating operation is performed. It is more likely that less energy will be required to prevent freezing when the liquid flow operation is performed. In the anti-freezing device of the present invention, the liquid cannot be circulated even if it is attempted to perform the liquid passing operation, that is, the heating operation is performed when the liquid passing operation is impossible. It ’s all you need. Therefore, according to the antifreezing apparatus of the present invention, it is possible to reliably prevent the liquid from being frozen while minimizing the energy consumed for preventing the liquid from freezing.

  In the invention according to claim 8, the liquid passing operation is selected from a plurality of operation modes including a continuous liquid passing mode in which the liquid is continuously passed and an intermittent liquid passing mode in which the liquid is passed intermittently. The anti-freezing device according to any one of claims 1 to 7, wherein the anti-freezing device can be implemented in any one of the operation modes.

  In the antifreezing device of the present invention, the operation mode of the liquid flow operation can be selected from a plurality of operation modes including a continuous liquid flow mode and an intermittent liquid flow mode. When the anti-freezing device of the present invention is operated in the continuous liquid passing mode, the liquid is continuously flowed into the liquid flow path, so that the liquid can be reliably prevented from freezing. In addition, the antifreezing device of the present invention can be operated in the intermittent liquid passing mode to prevent the liquid from freezing and suppress the energy consumption required for this to the minimum.

  According to the ninth aspect of the present invention, the liquid temperature detecting means for detecting the temperature of the liquid existing inside is provided in the middle of the liquid flow path, and the intermittent liquid passing through the liquid every predetermined pause time is provided. The antifreezing device according to any one of claims 1 to 8, wherein the liquid passing operation according to the mode can be performed, and the pause time is set based on the temperature of the liquid detected by the liquid temperature detecting means. It is.

  According to such a configuration, the liquid freezing can be surely prevented by selecting the continuous liquid passing mode as the operation mode of the liquid passing operation, and the energy consumption can be minimized by selecting the intermittent liquid passing mode. The liquid can be prevented from freezing while being suppressed.

  Moreover, when the antifreezing apparatus of the present invention performs the liquid passing operation in the intermittent liquid passing mode, the pause time for stopping the liquid passing is set according to the temperature of the liquid flowing in the liquid flow path. Therefore, according to the present invention, it is possible to minimize the liquid passing time required to prevent the liquid from freezing, and to contribute to energy saving correspondingly.

  The invention according to claim 10 is provided with connection means for electrically connecting the residence side temperature detection means and / or the heat source side temperature detection means, and the connection means includes the residence side temperature detection means and / or Alternatively, a detection unit to which the heat source side temperature detection unit is electrically connected and a compensation unit electrically independent of the detection unit are provided, and the stay side temperature detection unit and / or the connection unit is provided. The freezing according to any one of claims 1 to 9, wherein the compensation unit is electrically connected to a part or all of the detection unit by electrically connecting a heat source side temperature detection unit. Prevention device.

  In the anti-freezing device of the present invention, the detection unit and the compensation unit of the connection means are electrically independent, but by connecting the stay side temperature detection means and the heat source side temperature detection means, the detection unit and compensation of the connection means The part is configured to conduct. Therefore, the antifreezing device of the present invention connects the stay side temperature detection means and the heat source side temperature detection means by confirming whether or not the detection part and the compensation part constituting the connection part are electrically connected. The state can be confirmed.

  The antifreezing device according to any one of claims 1 to 10 can be suitably used when the heat consuming device is a bath (claim 11).

  A twelfth aspect of the present invention is a heat source device comprising the antifreezing device according to any one of the first to eleventh aspects.

  Since the heat source device of the present invention includes the antifreezing device as described above, the energy required for preventing the freezing of the liquid can be minimized.

  A thirteenth aspect of the invention includes the antifreezing device according to any one of the first to eleventh aspects, a heat source device, and a heat consuming device to which heat energy generated in the heat source device is supplied via a liquid. It is the heat consumption system characterized by having.

  Since the heat consumption system of the present invention includes the antifreezing device as described above, the energy required for preventing the liquid from freezing can be minimized.

  According to the antifreezing device of the present invention, it is possible to provide an antifreezing device capable of preventing freezing of the liquid flow path connecting the heat source device and the heat consuming device.

  Subsequently, an antifreezing apparatus and a heat source apparatus and a heat source system (heat consumption system) including the antifreezing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. The heat source device of the present embodiment is characterized by the anti-freezing device. The device configuration of the heat source device will be described prior to the description of the anti-freezing device.

  In FIG. 1 and FIG. 2, 1 is the heat source device of this embodiment. The heat source device 1 includes an antifreezing device F. The antifreezing device F includes a control unit 8 provided in the heat source device main body 5, a heat source side heater 26 (heat source side heating unit), a heat source side temperature sensor 30 (heat source side temperature detection unit), and a heat source device main body 5. It is the structure provided with the retention part side heater 41 (retention part heating means) and the retention part side temperature sensor 43 (retention part temperature detection means) which were provided outside. Further, the heat source device 1 is connected to the bathtub 3 (heat consuming device) by the circulation flow path 2, and the heat source system U including the anti-freezing device F is configured as a whole.

  As shown in FIG. 2, the heat source device 1 is roughly divided into a heat source device body 5, which is roughly divided into a combustion unit 10, and a heat exchange unit 11 that performs heat exchange between a combustion gas generated in the combustion unit 10 and a heat medium such as hot water. And a combustion device 6 including an air supply unit 12 that supplies air to the combustion unit 10 and an exhaust unit 13 that discharges the combustion gas that has passed through the heat exchange unit 11 to the outside. The heat source device main body 5 also includes piping for supplying a heat medium such as gas or hot water to the combustion device 6, control means 8, and the like.

  The combustion unit 10 includes a burner 15 that burns fuel gas supplied from the outside and a combustion space 16. A fuel supply pipe 17 for supplying fuel is connected to the burner 15.

  The high-temperature combustion gas generated by burning the fuel in the burner 15 passes through the combustion space portion 16 and flows to the heat exchange portion 11 side. The heat exchange unit 11 is connected to the combustion space 16 and includes a heat exchanger 18 that exchanges heat with the high-temperature combustion gas generated by the combustion operation of the burner 15. The heat exchanger 18 includes an inflow side pipe 20 for supplying hot water returned from the bathtub 3 to the heat exchanger 18, and an outflow side pipe 21 for supplying hot water heated in the heat exchanger 18 to the outside. Is connected. The inflow side pipe 20 and the outflow side pipe 21 are bypassed by a bypass flow path 31. The inflow side pipe 20 and the outflow side pipe 21 are connected to a return side flow path 22 and a forward flow path 23, which will be described later, to form the circulation flow path 2.

  In the middle of the inflow side pipe 20, a water amount sensor 27, a circulation pump 28 and a bath temperature sensor 29 are provided. The water amount sensor 27 detects the amount of water supplied from the outside via the inflow side pipe 20. The circulation pump 28 is for circulating hot water in the circulation flow path 2. Moreover, the bath temperature sensor 29 detects the temperature of the hot water returned from the bathtub 3 side to the heat source device 1 side.

  The outflow side pipe 21 is a pipe through which hot water heated by exchanging heat with high-temperature combustion gas in the heat exchanger 18 flows, and is connected to the forward side flow path 23. In the middle of the outflow side pipe 21, a water amount adjustment valve 25 and a heat source side heater 26 are provided. The water amount adjustment valve 25 adjusts the flow rate of hot hot water flowing downstream from the water amount adjustment valve 25 by opening and closing the flow path of the outflow side pipe 21.

  The heat source side heater 26 is attached in the middle of the inflow side pipe 20 and the outflow side pipe 21, and is built in the case of the heat source device main body 5. Further, a heat source side temperature sensor 30 for detecting the ambient temperature is provided in the heat source device main body 5. The operation of the heat source side heater 26 is controlled by the control means 8 based on the temperature detected by the heat source side temperature sensor 30.

  The air supply unit 12 incorporates a fan 32 (air blowing means) inside, and can change the rotational speed of the fan 32 in accordance with the combustion state of the burner 15 to adjust the air blowing amount and the air blowing pressure.

  The return-side flow path 22 and the forward-side flow path 23 extend downward with respect to the heat source device 1 and the bathtub 3 as shown in FIG. Both the return-side flow path 22 and the forward-side flow path 23 are laid under the floor from the interior of the house where the heat source device 1 and the bathtub 3 are installed, and the portion (the retention portion 40) is the other portion. Is lower than. More specifically, the bath return pipe 22 and the outward flow path 23 have hanging portions 35 and 35 that hang downward from the heat source device 1 and the bathtub 3, respectively. Thus, the staying portion 40 extends in the intersecting direction. For this reason, the return-side flow path 22 and the forward-side flow path 23 are each bent into a substantially “U” shape. Accordingly, the staying part 40 is a part where hot water tends to stay when the circulation pump 28 of the heat source device 1 is stopped and the flow of hot water in the circulation flow path 2 is stopped.

  A staying part side heater 41 that generates heat when electric power is supplied is attached to the staying part 40 of the return side passage 22 and the outward side passage 23. Further, a staying part side temperature sensor 43 is provided in the vicinity of the staying part 40. The detection signal of the staying part side temperature sensor 43 is input to the control means 8 provided in the heat source apparatus body 5. The operation of the staying part side heater 41 is controlled based on the staying part 40 detected by the staying part side temperature sensor 43 by the control means 8 or the temperature in the vicinity thereof.

  As shown in FIGS. 1 and 9, the staying portion side temperature sensor 43 is attached to the connection terminal 50 attached to the tip of the cable 45 and the tip of the cable 46 electrically connected to the control means 8. The connection is made by connecting the connection terminal 51. Each of the connection terminals 50 and 51 has a 3-port terminal. The stay part side temperature sensor 43 side cable 45 includes detection lines 45 a and 45 b and a compensation line 45 c connected to the detection part of the stay part side temperature sensor 43, and each is electrically connected to the connection terminal 50. ing. In addition, one detection line 45b is in a conductive (short-circuited) state with the compensation line 45c.

  The cable 46 extending from the control means 8 side is composed of sensor connection lines 46 a and 46 b and a compensation line 46 c, and each is independently connected to the connection terminal 51. Therefore, when the staying part temperature sensor 43 is not connected to the connection terminal 51, the sensor connection lines 46a and 46b and the compensation line 46c are in a non-conductive (open) state. On the other hand, when the connection terminal 50 on the staying portion side temperature sensor 43 side is connected to the connection terminal 51, the detection lines 45a and 45b and the sensor connection lines 46a and 46b become conductive, and the detection line 45b and the sensor connection line. 46b and the compensation lines 45c and 46c become conductive (short-circuited). Therefore, the control means 8 can determine that the staying portion side temperature sensor 43 is connected on condition that the detection line 45b, the sensor connection line 46b, and the compensation lines 45c, 46c are short-circuited.

  The control means 8 controls the operation of the entire heat source device 1 of the present embodiment, and is input with detection signals of each sensor including the heat source side temperature sensor 30 and the staying part side temperature sensor 43. The control means 8 is based on the detection signals received from the sensors, etc., the devices accommodated in the heat source device main body 5 such as the water amount adjusting valve 25, the burner 15, the heat source side heater 26, the fan 32, and the heat source device main body. Operation control of the staying part side heater 41 provided outside the 5 is performed.

  As described above, the circulation channel 2 is disposed at a position where the portion corresponding to the staying portion 40 is lower than the heat source device 1 and the bathtub 3. For this reason, when the water flow in the circulation flow path 2 is stopped, the hot water remaining in the return side flow path 22 and the forward side flow path 23 tends to stay in the retention portion 40. Moreover, in this embodiment, while the heat source apparatus 1 and the bathtub 3 are installed indoors, the part equivalent to the retention part 40 is distribute | arranged to the lower floor part of a house, and the temperature of the installation atmosphere of the retention part 40 is set. The possibility of being lower than the installation atmosphere of the heat source device 1 is high. Therefore, in the heat source system U, if the water flow in the circulation flow path 2 stops when the temperature is low, there is a high possibility that freezing will occur in the stay portion 40.

  In addition, the inflow side pipe 20 and the outflow side pipe 21 arranged inside the heat source apparatus body 5 also pass water through the circulation flow path 2 in a state where the ambient temperature at the installation location of the heat source apparatus 1 is low due to the influence of the temperature or the like. May stop and freezing may occur if hot water remains. Therefore, the control means 8 detects the atmospheric temperature in the heat source device body 5 and the atmospheric temperature of the place where the staying part 40 is laid by the heat source side temperature sensor 30 and the staying part side temperature sensor 43, and sets these detected temperatures. Based on the flowchart shown in FIG. 3 to FIG. 5 and FIG. 7, the stagnant portion freezing prevention operation is performed, and the heat source side freezing prevention operation is executed according to the control flow shown in FIG. 8.

  More specifically, the retention portion freezing prevention operation includes a circulation mode in which hot water is circulated in the circulation flow path 2 and the freezing of hot water in the circulation flow path 2 by operating the heat source side heater 26 and the retention portion side heater 41. It is roughly divided into a heating mode for preventing the above. The operation mode of the stagnant portion freeze prevention operation is switched depending on whether hot water can be circulated in the circulation flow path 2 or not.

  The stagnation part freezing prevention operation in the circulation operation mode is performed by selecting either the continuous operation mode in which the circulation pump 28 is continuously operated or the intermittent operation mode in which the circulation pump 28 is operated at a predetermined time interval. Is done. The operation method in the circulation operation mode can be set as appropriate by an operator using a remote controller (not shown) or the like. When the intermittent operation mode is selected as the operation method in the circulation mode, the operation is circulated to an interval timer (not shown) provided in the control means 8 based on the temperature detected by the bath temperature sensor 29 (hereinafter referred to as the water temperature BT). The pause time of the pump 28 is set. When the intermittent operation mode is performed, after a pause time set in the interval timer of the control means 8 has elapsed, the circulation pump 28 is operated for a predetermined time to circulate hot water in the circulation flow path 2.

  The stagnant portion freeze prevention operation is performed while the reheating operation for heating the hot water in the bathtub 3 or the dropping operation is stopped. That is, the control flow proceeds to step 1-2 on condition that the combustion unit 10 stops the combustion operation in step 1-1 of the control flow of FIG. 3, and the stagnant portion freeze prevention operation is started.

  When the control flow proceeds to step 1-2, the control means 8 determines that the detection temperature FT of the heat source side temperature sensor 30 installed in the heat source device body 5 is less than a predetermined heat source side threshold temperature (5 ° C. in this embodiment). It is confirmed whether or not. Here, as described above, the heat source device main body 5 is installed indoors, and is very likely to be hotter than the vicinity of the staying portion 40. Therefore, the above-mentioned heat source side threshold temperature is the operating temperature (2 ° C. in the present embodiment) that is the operating condition of the heat source side heater 26 in the heat source side freezing prevention operation, which will be described later, that is, left in a water flow stop state. Then, the temperature is set higher than the temperature at which hot water remaining in the heat source device 1 may freeze.

  In step 1-2, when the detected temperature FT is the heat source side threshold temperature (less than 5 ° C.), freezing may occur in any part of the circulation flow path 2. Therefore, when the detected temperature FT is less than 5 ° C. in Step 1-2, the control flow is advanced to Step 1-3, and the stagnant portion freeze prevention operation is performed.

  On the other hand, even in the case where the detection temperature FT of the heat source side temperature detection means 30 is 5 ° C. or higher in Step 1-2, the vicinity of the staying portion 40 arranged under the floor is locally low in temperature, and freezing occurs. May occur. Therefore, if the detected temperature FT is 5 ° C. or higher in step 1-2, the control flow proceeds to step 1-8, and the detected temperature ET of the staying part side temperature sensor 43 installed in or around the staying part 40 is confirmed. To do. Here, when the detected temperature ET is 2 ° C. or higher, the hot water staying in the staying portion 40 may be frozen even when the combustion operation is stopped and the water flow in the circulation channel 2 is stopped. Low. Therefore, the control means 8 returns the control flow to step 1-1 on condition that the detected temperature ET is 2 ° C. or higher in step 1-8.

  On the other hand, when the detection temperature ET of the staying part side temperature detection sensor 43 is less than 2 ° C. in Step 1-8, the part on the heat source device main body 5 side is hot enough not to freeze the hot water, but in the vicinity of the staying part 40 The temperature is low, and there is a possibility that the hot water staying here will freeze. For this reason, the control means 8 advances the control flow to step 1-4 on condition that the detected temperature ET is less than 2 ° C. in step 1-8, and performs the stagnant portion freeze prevention operation.

  When the control flow proceeds to step 1-4, the control means 8 stops the operation of the staying portion side heater 41, and then proceeds to step 1-5 to check the circulating operation according to the subroutine shown in FIG. carry out.

  More specifically, after stopping the storage section side heater 41 in step 1-4, the control means 8 advances the control flow to step 2-1 shown in FIG. When the control flow proceeds to step 2-1, the control means 8 activates the circulation pump 28, and the water amount sensor 27 checks whether the water amount has changed, that is, whether hot water is circulating in the circulation flow path 2. Here, the control means 8 determines whether or not the circulation operation is possible depending on whether or not the circulation of hot water is confirmed over a predetermined time. When the determination as to whether or not the circulation operation is possible is confirmed, the subroutine shown in FIG. 4 is completed, and the control flow is returned to step 1-6 in FIG.

  On the other hand, until the circulation determination is confirmed in Step 2-2, the control means 8 determines whether or not the combustion unit 10 is still in the combustion stop state in Step 2-3, that is, whether the hot water is dropped into the bathtub 3 or not. Check if chasing has started. If the combustion is stopped in step 2-3, the control means 8 continues to operate the circulation pump 28 and continues the operation for determining whether or not the circulation operation is possible. On the other hand, when the start of the combustion operation is confirmed in step 2-3, the control means 8 stops the circulation pump 28 in step 2-4 and returns the control flow to step 1-1 in FIG.

  When the determination as to whether or not the circulating operation is possible is confirmed as described above, and the control flow is returned to step 1-6, the control means 8 is based on the determination result as to whether or not the circulating operation is performed in the subroutine described above. Assign control flow. That is, if the circulation operation is possible, the control means 8 advances the control flow to step 1-7, and performs the stagnant portion freeze prevention operation in the circulation mode according to the subroutine shown in FIG. On the other hand, if the circulation operation is impossible, the control means 8 advances the control flow to step 1-9, and performs the stagnant portion freeze prevention operation in the heating mode according to the subroutine shown in FIG.

  More specifically, when the control flow proceeds to step 1-7, the stagnant portion freeze prevention operation in the circulation mode is started in accordance with the subroutine shown in FIG. When the control flow moves to step 3-1, the control means 8 confirms whether or not the operation method is set to the continuous operation mode by the circulation operation mode. Here, when the continuous operation mode is set to be performed in the circulation operation mode, the control mode proceeds to step 3-2, and the process returns to step 1-1 with the circulation pump 28 operating.

  On the other hand, when the intermittent operation mode is selected as the operation method in the circulation operation mode, the control flow proceeds to step 3-3, and the circulation pump 28 is temporarily stopped. Thereafter, the control means 8 detects the temperature detected by the bath temperature sensor 29 in step 3-4, that is, the temperature of the hot water returned from the bathtub 3 side (water temperature BT) to the set temperature BS of the hot water stored in the bathtub 3. On the other hand, it is confirmed whether it is higher by 2 ° C. or more. Here, the set temperature BS corresponds to the target temperature of hot water when dropping into the bathtub 3 and the target temperature when reheating the hot water in the bathtub 3. In step 3-4, if the water temperature BT is higher than the set temperature BS by 2 ° C. or more, the control flow proceeds to step 3-5, and if not, the control flow proceeds to step 3-13.

  When the control flow proceeds to step 3-5, the control means 8 confirms whether or not the water temperature BT detected by the bath temperature sensor 29 is 55 ° C. or higher. Here, when the water temperature BT is 55 ° C. or higher, the detected temperature FT of the heat source side temperature sensor 30 is lower than the heat source side threshold temperature (see Step 1-2), or the detected temperature ET of the staying part side temperature sensor 43 is Even if it is less than 2 ° C. (refer to step 1-8), which is the retention portion side threshold temperature, there is a very low possibility that the hot water present in the circulation flow path 2 will freeze immediately. Therefore, the control flow is returned from the subroutine shown in FIG. 5 to the control flow (main routine) shown in FIG. 3 without starting the circulation pump 28 on condition that the water temperature BT is 55 ° C. or higher in step 3-5.

  On the other hand, when the water temperature BT is lower than 55 ° C. in the above step 3-5, the set time of the interval timer provided in the control means 8, that is, the pause time of the circulation pump 28 is set to T1. In the heat source device 1 of the present embodiment, the pause time T1 is set to 20 minutes. When the setting of the pause time T1 is completed, the control flow proceeds to step 3-7.

  When the control flow proceeds to step 3-13, it is confirmed whether or not the water temperature BT is 25 ° C. or lower. Here, when the water temperature BT is 25 ° C. or lower, the control flow proceeds to step 3-14, and the pause time of the circulation pump 28 is set to T2 in accordance with the pause time table shown in FIG.

  More specifically, the pause time table in FIG. 6A is for setting the pause time T2 based on the detected temperature FT of the heat source side temperature sensor 30 and the detected temperature ET of the staying portion side temperature sensor 43. It is. Since the possibility that the hot water flowing in the circulation flow path 2 is frozen increases as the detected temperatures FT, ET are lower, the pause time T2 is set to be shorter as the detected temperatures FT, ET are lower. In particular, when the detected temperature FT of the heat source side temperature sensor 30 is lower than -1 ° C, or when the detected temperature ET of the staying portion side temperature sensor 43 is lower than -4 ° C, the operation of the circulation pump 28 is stopped. Since there is a high possibility that the hot water in the circulation channel 2 will freeze, the pause time T2 is set to zero minutes. That is, the operation method in the circulation operation mode is switched to the continuous operation mode on condition that the detection temperature FT is less than −1 ° C. or the detection temperature ET is less than −4 ° C.

  When the water temperature BT is higher than 25 ° C. in Step 3-13, the control flow proceeds to 3-15, and the pause time of the circulation pump 28 is set to T3. Here, the pause time T3 is set according to the pause time table shown in FIG. 6B, similarly to the method for setting the pause time T2. The rest time table shown in FIG. 6B is classified based on the detected temperature FT of the heat source side temperature sensor 30 and the detected temperature ET of the staying part side temperature sensor 43, similar to that shown in FIG. The rest time T3 is set according to each temperature condition.

  Here, when the control flow proceeds to step 3-15, the hot water temperature BT existing in the circulation flow path 2 is higher than when the control flow proceeds to step 3-14, and the possibility of freezing is low. Therefore, the pause time table shown in FIG. 6B is the same as the pause time table shown in FIG. 6A and the range (range) of the detected temperatures FT and ET, and the higher the detected temperatures FT and ET, the higher the detected temperature FT and ET. The pause time T3 is set to be longer, but when the pause times T2 and T3 are compared for each temperature condition, the pause time T3 is set to be longer than the pause time T2.

  As described above, when the interval timer is set in step 3-6, step 3-14, or step 3-15, the control flow proceeds to step 3-7. In step 3-7, when the combustion operation of the combustion section 10 is started, the control flow is returned from the subroutine shown in FIG. 5 to the main routine shown in FIG. On the other hand, when it is confirmed in step 3-7 that the combustion operation is stopped, the control flow proceeds to step 3-8, and whether or not the detected temperature FT of the heat source side temperature sensor 30 has reached 9 ° C. Is confirmed. Here, when the detected temperature FT is 9 ° C. or less, the return side flow path 22 and the forward side flow path 23 arranged outside the heat source device main body 5 are at a lower temperature, such as the floor. There is a possibility that hot water will freeze in the staying section 40 and the like, and it is necessary to carry out a circulation operation. Therefore, when the detected temperature FT is 9 ° C. or lower, the control unit 8 advances the control flow to step 3-10, and waits until the timing of the interval timer is completed and the circulation pump 28 is started.

  On the other hand, if the detected temperature FT of the heat source side temperature sensor 30 is higher than 9 ° C. in Step 3-8, there is a possibility that the hot water is not frozen in the vicinity of the staying portion 40 as well. However, when the temperature difference between indoors and outdoors is large, such as in midwinter, there is a possibility that the vicinity of the stay 40 under the floor is locally low even if the heat source device body 5 side is hot. Therefore, the control means 8 advances the control flow to step 3-9 even if the detected temperature FT is higher than 9 ° C., and confirms the detected temperature ET of the staying part side temperature sensor 43. Here, when the detected temperature ET is higher than 6 ° C., the possibility that the hot water existing in the circulation flow path 2 is frozen is extremely low. Therefore, the control means 8 completes the control by the subroutine shown in FIG. 5 on condition that the detected temperature ET is higher than 6 ° C., and returns the control flow to the main routine shown in FIG. Conversely, if the detected temperature ET of the staying part side temperature detecting means 43 disposed in the vicinity of the staying part 40 in step 3-9 is 6 ° C. or less, the hot water in the circulation flow path 2 may be frozen. There is. Therefore, when the detected temperature ET is 6 ° C. or lower, the control means 8 advances the control flow to step 3-10 and waits for the time measurement by the interval timer to be completed.

  As described above, when the control flow proceeds to step 3-10 and it is confirmed that the time measurement of the interval timer has been completed, the control flow proceeds to step 3-11, the circulation pump 28 is activated, and the circulation flow path is started. While hot water flows through the pump 2, a pump timer (not shown) that measures the activation time of the circulation pump 28 starts counting. Circulation pump 28 continues to operate until pump timer timing is completed in step 3-12. Thereby, the hot water circulates in the circulation flow path 2 and the freezing of the hot water is prevented. When the pump timer completes timing in step 3-12, the control means 8 stops the circulation pump 28 in step 3-16, and then returns the control flow to the main routine shown in FIG.

  Returning to the description of the control by the main routine shown in FIG. 3, when hot water can be circulated in the circulation flow path 2, the stagnant portion freezing prevention operation in the circulation mode is performed according to the subroutine shown in FIG. However, when the circulation operation is impossible, the control flow proceeds to step 1-9, and the stay portion freezing prevention operation by the stay portion heating operation is performed according to the subroutine shown in FIG.

  More specifically, when the control flow proceeds to step 1-9, the control means 8 advances the control flow to step 4-1 of the subroutine of FIG. 7 and stops the circulation pump 28. Thereafter, the control means 8 checks whether or not the detected temperature FT of the heat source side temperature sensor 30 installed in the heat source device body 5 is 8 ° C. or less. Here, when the detected temperature FT is higher than 8 ° C., the control flow shifts to Step 4-3, and the detected temperature ET of the staying part side temperature sensor 43 installed in the vicinity of the staying part 40 is 5 ° C. or less. It is confirmed whether or not. Here, when the detected temperature ET is higher than 5 ° C., the temperature in the vicinity of the retention portion 40 in addition to the heat source device main body 5 is also somewhat high, and the hot water remaining in the circulation flow path 2 may be frozen. Is low. Therefore, when the detected temperature ET is higher than 5 ° C. in step 4-3, the control means 8 completes the control by the subroutine shown in FIG. 7 and returns the control flow to the main routine shown in FIG. At this time, when the energization is performed on the staying portion side heater 41 when the control flow proceeds to step 4-3, the energization to the staying portion side heater 41 is stopped in step 4-8, and then the control flow is changed. Returning to the main routine shown in FIG.

  On the other hand, when the detected temperature ET of the staying part side temperature sensor 43 is 5 ° C. or lower in Step 4-3, the control means 8 further confirms whether or not the detected temperature ET is 2 ° C. or lower in Step 4-4. To do. If the detected temperature ET is higher than 2 ° C., the control flow proceeds to step 4-5. When the control flow proceeds to step 4-5, it is confirmed whether the staying portion side heater 41 is operating.

  Here, when the staying part side heater 41 is in operation, the detected temperature ET of the staying part side temperature sensor 43 is low before reaching Step 4-5. The staying portion side heater 41 is activated through the control flow, and the staying portion 40 and the vicinity thereof are being heated. Therefore, when the staying part side heater 41 is operating in step 4-5, the control flow proceeds to step 4-6, and energization to the staying part side heater 41 is continued.

  On the other hand, when the staying part side heater 41 is stopped, the control flow after step 4-6 described later has not yet passed. Further, when the control flow shifts to step 4-5, the detection temperature ET of the staying portion side temperature sensor 43 is higher than 2 ° C., and the hot water remaining in the staying portion 40 or in the vicinity thereof can immediately freeze. The nature is low. Therefore, the control means 8 returns the control flow to step 4-1.

  As described above, when the detected temperature ET is 2 ° C. or lower in Step 4-4, there is a high possibility that the hot water staying in the vicinity of the stay portion 40 will freeze. Further, as described above, when the control by the subroutine shown in FIG. 7 is performed, the circulation operation is impossible. Therefore, the control means 8 advances the control flow to step 4-6 on the condition that the detected temperature ET is 2 ° C. or less, and operates the staying portion side heater 40. Thereafter, the control flow proceeds to step 4-7.

  Moreover, when the control flow has shifted from step 4-5 to step 4-7, the staying part side heater 41 is operating, but the staying part 40 and its vicinity are not yet sufficiently heated. Therefore, when the control flow has shifted from step 4-5 to step 4-6, the control means 8 continues to energize the staying part side heater 41 and advances the control flow to step 4-7.

  When the control flow proceeds to step 4-7, the control means 8 confirms whether the detected temperature ET of the staying part side temperature sensor 43 is higher than 6 ° C. Here, when the detection temperature ET of the staying part side temperature sensor 43 is higher than 6 ° C., the hot water remaining in the staying part 40 is frozen even when the energization to the staying part side heater 41 is stopped. Is less likely to cause Therefore, the control means 8 advances the control flow to step 4-8 on condition that the detected temperature ET is higher than 6 ° C. in step 4-7, and stops energization to the staying part side heater 41. Then, the heating operation by the subroutine shown in FIG. Thereafter, the control means 8 returns the control flow to the main routine shown in FIG.

  On the other hand, when the detected temperature ET is 6 ° C. or less, the staying part 40 and the vicinity thereof are still at a low temperature, and hot water staying in the vicinity of the staying part 40 may be frozen. Therefore, the control means 8 returns the control flow to step 4-1 while operating the staying part side heater 41 on condition that the detected temperature ET is 6 ° C. or less.

  When the control flow is returned to step 4-1, the operation of the heat source device 1 is controlled in accordance with the control flow described above. When it is confirmed in step 4-3 that the detected temperature ET of the staying part side temperature sensor 43 is higher than 5 ° C. due to the energization of the staying part side heater 41 or the like in step 4-7. If it is confirmed that the detected temperature ET is higher than 6 ° C., the energization to the staying portion side heater 41 is stopped in step 4-8, and then the control flow is returned to the main routine shown in FIG. It is.

  As described above, the freeze prevention device F performs the stagnant portion freeze prevention operation in accordance with the control flow shown in FIGS. 3 to 5 and 7, and also performs the heat source side freeze prevention operation in accordance with the control flow shown in FIG. 8. .

  More specifically, when the heat source side heating operation shown in FIG. 8 is performed, first, in step 5-1, the combustion operation in the combustion section 10 is stopped and the water flow in the circulation passage 2 is stopped. It is confirmed whether or not the combustion is stopped. When the combustion operation is being performed in step 5-1, since hot water heated in the heat source device 1 circulates in the circulation flow path 2, there is no fear of freezing. Therefore, in this case, the control flow proceeds to step 5-5, and the heat source side heater 26 is brought into an operation stop state. On the other hand, when the combustion is stopped in step 5-1, the control flow proceeds to step 5-2, and it is confirmed whether or not the detected temperature FT of the heat source side temperature sensor 30 is equal to or lower than a predetermined operating temperature. Here, the above-described operating temperature is set to a temperature at which hot water may eventually freeze when the water flow in the circulation passage 2 is stopped or slightly higher than this. In the present embodiment, the operating temperature of the heat source side heater 26 is set to 2 ° C.

  If the detected temperature FT of the heat source side temperature sensor 30 is 2 ° C. or lower in step 5-2, the control flow proceeds to step 5-3, and the heat source side heater 26 is activated. Thereafter, the control flow proceeds to step 5-4, and the heat source side heater 26 is operated until the detected temperature FT of the heat source side temperature sensor 30 reaches a predetermined threshold temperature (for example, 6 ° C.). Thereafter, a series of control flow from step 5-1 to step 5-4 is repeated until the combustion operation is started or the detected temperature FT is higher than 6 ° C., and the heat source side heater 26 is continuously or intermittently. Keeps working.

  When the detected temperature FT reaches 6 ° C. (threshold temperature) in step 5-4, it is assumed that freezing does not occur in the inflow side piping 20, the outflow side piping 21, and the vicinity thereof constituting the circulation flow path 2. Therefore, on condition that the detected temperature FT exceeds 6 ° C. in step 5-4, the control flow proceeds to step 5-5, the operation of the heat source side heater 26 is stopped, and a series of heat source side freezing is performed. Prevention operation is completed.

  In the said embodiment, since the case where the heat source apparatus main body 5 was installed indoors was assumed, if the detection temperature FT of the heat source side temperature sensor 30 installed in the heat source apparatus main body 5 is low temperature, the residence part 40 Assuming that the vicinity is also low temperature, freezing in the vicinity of the staying section 40 is prevented by performing a circulation operation or performing a staying section side heating operation. However, when the heat source device main body 5 is installed outdoors, the heat source device main body 5 side may be colder than the staying portion 40 side. Further, even when the heat source device main body 5 is installed indoors, the possibility that the temperature of the heat source device main body 5 becomes lower than the vicinity of the staying part 40 for some reason cannot be completely denied.

  Therefore, based on such knowledge, when the freezing prevention operation by the circulation operation is not possible because the amount of hot water stored in the bathtub 3 is small, the detection temperatures of the heat source side temperature sensor 30 and the staying portion side temperature sensor 43 are not detected. It is also possible to adopt a configuration in which one or both of the staying portion side heating operation and the heat source side heating operation are appropriately performed according to FT and ET.

  More specifically, the heat source device 1 may employ, for example, the control flow shown in FIG. 10 instead of the control flow shown in FIG. 3 as the main routine of the control flow of the freeze prevention operation. Hereinafter, the case where the freeze prevention operation is performed according to the control flow shown in FIG. 10 will be described in detail with reference to the drawings. Note that the control flow shown in FIG. 10 is largely the same as the control flow shown in FIG. 3, and thus detailed description of common parts is omitted.

  When the freeze prevention operation is performed according to the control flow shown in FIG. 10, the same control as in steps 1-1 to 1-6 of the control flow shown in FIG. 3 is performed in steps 6-1 to 6-6. Is called. However, in the control flow shown in FIG. 10, the flag A, based on the detected temperature FT of the heat source side temperature sensor 30 and the detected temperature ET of the staying part side temperature sensor 43 between Step 6-1 and Step 6-3. Based on the point of classifying the state where the heat source device main body 5 and the staying part 40 are exposed by B and the antifreezing operation by circulation operation is impossible before reaching Step 6-3. The point which implements the residence part side heating operation and the heat source side heating operation differs from the control flow shown in FIG.

  More specifically, when the freeze prevention operation is performed according to the control flow shown in FIG. 10, first, in step 6-1, it is confirmed whether the combustion is stopped and there is no water flow in the circulation flow path 2. Is done. When the combustion is stopped in step 6-1, the control flow proceeds to step 6-2, and the vicinity of the inflow side pipe 20 and the outflow side pipe 21 arranged in the heat source device body 5 by the heat source side temperature sensor 30. The temperature (detection temperature FT) is detected.

  When the detected temperature FT is confirmed in Step 6-2, the control flow proceeds to Step 6-7a or Step 6-7c, and the detected temperature ET of the staying part side temperature sensor 43 installed in the vicinity of the staying part 40 is confirmed. Is done. When the detected temperature ET is 2 ° C. or higher in Step 6-7a, the detected temperature FT of the heat source side temperature sensor 30 is also high, and the possibility of freezing in the circulation flow path 2 is extremely low. Therefore, in this case, the control flow is returned to step 6-1.

  On the other hand, when the detected temperature ET of the staying portion side temperature sensor 43 is less than 2 ° C. in Step 6-7a, the detected temperature FT of the heat source side temperature sensor 30 detected in Step 6-2 is high, and the heat source device body 5 This is a case where there is a low possibility that freezing will occur on the side, but there is a possibility that freezing will occur at the site because the vicinity of the stay 40 located under the floor is at a low temperature. Therefore, in this case, it is necessary to prevent the freezing in the vicinity of the staying portion 40 by performing the circulation operation or the storage portion side heating operation. Therefore, the control means 8 sets the flag A to perform the freeze prevention operation by the circulation operation or the staying portion side heating operation in Step 6-7b on the condition that the detected temperature ET is less than 2 ° C. in Step 6-7a. And the control flow proceeds to step 6-3.

  When the control flow proceeds from step 6-2 to step 6-7c, the temperature detected by the heat source side temperature sensor 30 is low, and there is a possibility that freezing will occur in the heat source device body 5. However, when the detected temperature ET of the staying part side temperature sensor 43 detected in step 6-7c is 2 ° C. or higher, the vicinity of the staying part 40 is not so low as to cause freezing. Therefore, in this case, it is necessary to prevent freezing in the inflow side piping 20 and the outflow side piping 21 accommodated in the heat source device main body 5 and in the vicinity thereof. Therefore, when the detected temperature ET is 2 ° C. or higher in step 6-7c, the control means 8 turns on the flag B in step 6-7d so as to perform the freeze prevention operation by the circulation operation or the heat source side heating operation. The control flow proceeds to step 6-3.

  On the other hand, when the detection temperature ET of the staying part side temperature sensor 43 is less than 2 ° C. in step 6-7c, the staying part 40 and the vicinity of the heat source apparatus main body 5 side are also at a low temperature. Freezing may occur in both the vicinity of the portion 40. In such a case, it is necessary for the control means 8 to perform the anti-freezing operation in a form in which the circulation operation is performed or the staying portion side heating operation and the heat source side heating operation are simultaneously performed. Therefore, in order to carry out the anti-freezing operation in such an operation mode, the control means 8 does not turn on both the flags A and B when the detected temperature ET is less than 2 ° C. in step 6-7c. The flow proceeds to step 6-3.

  As described above, the temperature of the installation atmosphere of the heat source device 1 (detected temperatures FT, ET) is detected, and based on this, the classification of the state in which the heat source device main body 5 and the staying part 40 are exposed by the flags A and B is performed. Once performed, the control flow proceeds from step 6-3 to step 6-5 sequentially. Step 6-3 to Step 6-5 are the same control flow as Step 1-4 to Step 1-6 of the control flow shown in FIG. 3, and it is confirmed whether or not the freeze prevention operation by the circulation operation is possible. Is done. Here, when the freeze prevention operation by the circulation operation is possible, the control flow shifts to Step 6-6. Step 6-6 is a step of performing the same control as Step 1-7 of the control flow shown in FIG. That is, when the control flow proceeds to step 6-6, the control means 8 circulates hot and cold water in the circulation flow path 2 according to the subroutine shown in FIG. 5 to prevent freezing. When the subroutine shown in FIG. 5 is completed and the process returns to the main routine shown in FIG. 10, both the flags A and B are turned off in step 6-11, and then the control flow is returned to step 6-1.

  On the other hand, if it is determined from step 6-3 to step 6-5 that the circulation operation is impossible, the control flow proceeds to step 6-8a. Here, when the flag A is in the on state in the control flow described above, the control flow proceeds to step 6-8b, and when it is in the off state, the process proceeds to step 6-9a.

  When the control flow proceeds to step 6-8b, the flag A is in an on state, that is, the heat source device body 5 side is not low enough to cause freezing, but there is a possibility that freezing may occur on the staying portion 40 side. is there. Therefore, when the control flow shifts to Step 6-8b, the control means 8 shifts the control flow to the subroutine shown in FIG. 7, and performs the above-described staying portion side heating operation. When the subroutine shown in FIG. 7 is completed and the control flow returns to the main routine shown in FIG. 10, the flag A is turned off in step 6-8c. Thereafter, the control flow returns to step 6-1.

  Further, when the flag A is off in step 6-8a and the control flow shifts to step 6-9a, the control means 8 checks whether or not the flag B is on. Here, when the flag B is in the on state, the control flow proceeds to step 6-9b, and when the flag B is in the off state, the control flow proceeds to step 6-10.

  When the control flow moves to step 6-9b, flag B is in an on state, that is, freezing may occur on the heat source device main body 5 side, but freezing may occur on the staying portion 40 side rather than low temperature. This is the case when the nature is low. Therefore, when the control flow moves to step 6-9b, the control means 8 performs the heat source side heating operation according to the subroutine shown in FIG.

  Here, the subroutine shown in FIG. 11 is substantially the same as the control flow for the heat-source-side freeze prevention operation shown in FIG. That is, each step from Step 7-1 to Step 7-3 corresponds to Step 5-3 to Step 5-5 in the control flow for the heat source side freezing prevention operation shown in FIG. More specifically, in the subroutine shown in FIG. 11, first, the heat source side heater 26 is activated in Step 7-1, and the heat source side heater 26 starts until the detected temperature FT of the heat source side temperature sensor 30 becomes higher than 6 ° C. Heating continues. Thereafter, when it is confirmed in step 7-2 that the detected temperature FT is higher than 6 ° C., the control means 8 stops the heat source side heater 26 in step 7-3, and the control flow is shown in FIG. Return to the main routine shown.

  On the other hand, if both the flags A and B are in the off state, the control flow proceeds to step 6-10. When the control flow proceeds to Step 6-10, the freeze prevention operation by the circulation operation is impossible even though the hot water may freeze in the heat source device main body 5, the staying portion 40 and the vicinity thereof. is there. Therefore, when the control flow shifts to step 6-10, the control means 8 causes the staying portion side heating operation shown in FIG. 7 and the heat source side heating operation shown in FIG. To prevent. When the control by the subroutine shown in FIGS. 7 and 8 is completed, the control flow is returned to the main routine shown in FIG.

  As described above, the antifreezing device F of the present embodiment has the residence-side temperature sensor even if the detected temperature FT detected by the heat source-side temperature sensor 30 is equal to or higher than the heat source-side threshold temperature (5 ° C. in the present embodiment). On the condition that the detected temperature ET of 43 is lower than a predetermined staying side threshold temperature (2 ° C. in the present embodiment), the staying part side freezing prevention by the staying part side heater 41 is stopped in a state where heating by the heat source side heater 26 is stopped. Operation is carried out. Therefore, the anti-freezing device F prevents the occurrence of freezing in the staying portion 40 even when it is used in a state where the staying portion 40 is locally located at a low temperature as in the above embodiment. can do.

  The anti-freezing device F performs the heating of the staying part 40 (the staying part side heating operation) or the circulation operation when there is a risk of freezing in the staying part 40 or in the vicinity thereof. The heat source heater 26 does not operate unless the temperature FT falls below the temperature (operation threshold temperature) at which hot water may freeze. For this reason, in the freeze prevention device F, the heat source side heater 26 does not operate more than necessary, and the energy required for freeze prevention in the circulation flow path 2 can be minimized.

  In the above embodiment, the hot water remaining in the bathtub 3 is circulated through the circulation channel 2. Therefore, when the hot water in the bathtub 3 is at a certain high temperature, the thermal energy of the hot water in the bathtub 3 can be effectively used to prevent freezing in the staying portion 40 by performing a circulation operation. In particular, when the intermittent operation mode is selected as the operation method, the pause time can be set relatively long, which contributes to energy saving.

  Here, the heat source device 1 may be configured to be able to heat hot water used for other purposes such as hot water supply and heating in addition to heating the hot water in the bathtub 3 by the heat exchange unit 11. In the case of such a configuration, although the heating operation of the hot water in the bathtub 3 is not performed for a certain period, the combustion operation may be performed in the burner 15 in order to heat the hot water for use in other applications. is there. In such a case, there is a possibility that the detected temperature ET of the staying portion side temperature sensor 43 becomes so low that the hot and cold water is frozen, although the thermal energy remains. Thus, in the case where the heat source device 1 has a structure in which the vicinity of the retention portion 40 may become low temperature even though it is immediately after stopping the combustion operation, by performing the circulation operation, The thermal energy remaining in the heat source device 1 can be effectively used for preventing freezing of hot water.

  In the antifreezing device F of the present embodiment, the heat source side heating operation or the staying portion side heating operation (heating operation) for operating the heat source side heater 26 and the staying portion side heater 41 rather than performing the circulation operation (liquid passing operation). The power consumption is higher when implementing. Moreover, when it is set as the structure like the said embodiment, it may become the temperature of the grade which the hot water in the circulation flow path 2 does not freeze by the influence of the thermal energy which remains in the heat-source apparatus 1, and the inside of the bathtub 3 There is a possibility that the temperature of the hot water is high to some extent, and if the circulation operation is carried out, there is a possibility that these thermal energies can be effectively used for freezing prevention. Based on this knowledge, in the freeze prevention device F of the present embodiment, the circulation operation is performed as long as the circulation operation is possible, and the heat source side heating operation and the residence part side heating operation are performed only when the circulation operation is impossible. It is configured. Therefore, according to the freeze prevention apparatus F, it is possible to reliably prevent the liquid from being frozen while minimizing the energy consumed for preventing the liquid from freezing.

  The anti-freezing device F determines whether or not hot water can be circulated in the circulation flow path 2 according to the subroutine shown in FIG. 4 when performing the stay portion anti-freezing operation, and the hot water can be circulated. When it is determined, the circulation operation is preferentially performed over the staying portion heating operation. Therefore, according to the freeze prevention apparatus F, the power consumption accompanying operation | movement of the residence part side heater 41 can be suppressed to the minimum.

  As described above, when the anti-freezing device F performs the stagnation part freeze prevention operation by the circulation operation, the freeze prevention device F performs the continuous operation mode in which the hot water continuously flows into the circulation flow path 2 or stops the hot water for a predetermined pause. It is possible to select whether to implement the intermittent operation mode that flows every hour. Therefore, the freeze prevention device F can reliably prevent freezing of hot water by selecting the continuous operation mode as the operation method of the circulating operation, and can prevent freezing of hot water in the staying portion 40 by selecting the intermittent operation mode. However, the energy consumption required for this can be minimized.

  Furthermore, the freeze prevention device F is suspended in the intermittent operation mode based on the temperature of hot water returning from the bathtub 3 side detected by the bath temperature sensor 29 provided in the middle of the inflow side pipe 20 constituting the circulation flow path 2. The time is adjusted. More specifically, the anti-freezing device F takes a longer pause time when the temperature of the hot water circulating through the circulation channel 2 is relatively high, and a pause time when the temperature of the hot water is relatively low. It is set as the structure shortened. Therefore, the antifreezing device F can minimize the operation time of the circulation pump 28 during the circulation operation, that is, the flowing time of hot water in the circulation channel 2.

  As described above, in the freeze prevention device F, the connection state of the compensation line 46c changes by connecting the connection terminals 50 and 51 as shown in FIG. Therefore, the antifreezing device F can determine whether or not the staying portion side temperature sensor 43 is connected to the control means 8 only by confirming the conduction state of the compensation line 46c.

  In the above embodiment, the example in which the connection terminals 50 and 51 described above are employed in the connection portion between the cable 45 of the staying portion side temperature sensor 43 and the cable 46 on the control means 8 side is illustrated. Similar connection terminals 50 and 51 may be employed at the connection portion with the side temperature sensor 30.

  Since the heat source device 1 and the heat source system U described above include the anti-freezing device F, the energy required for preventing the liquid from freezing can be minimized.

  In the said embodiment, although the example which employ | adopted the freezing prevention apparatus F to the heat source system U provided with the circulation flow path 2 which connects the heat source apparatus 1 and the bathtub 3 was illustrated, this invention is not limited to this, It is good also as a structure which employ | adopted the freeze prevention apparatus F to the thing provided with heat consumption apparatuses, such as fan convectors other than the bathtub 3, and the heat-source apparatus 1, and the circulation flow path 2 which connects these. Moreover, in the said embodiment, although the example which hot water can circulate through the circulation flow path 2 was illustrated, this invention is not limited to this, The flow path where the hot water does not circulate instead of the circulation flow path 2 is provided. It may be. That is, the heat source system U may be configured not to include the return-side flow path 22 or may be configured to include a flow path for supplying hot water to the currant or the like instead of the circulation flow path 2. .

  In the said embodiment, although the example in which the retention part 40 was provided under the floor was illustrated, this invention is not limited to this, The case where it distributes along the wall surface of a house, the inside of a ceiling, a duct, etc. It may be installed anywhere.

  In the said embodiment, in order to simplify description, although the example which the residence part 40 exists in the middle of the circulation flow path 2 was illustrated, this invention is not limited to this, The residence part 40 is not limited to this. Furthermore, the structure which exists in large numbers may be sufficient. In the case of such a configuration, for example, a staying portion side heater 41 and a staying portion side temperature sensor 43 may be provided for each staying portion 40, and the staying portion side temperature sensor 43 is provided only in a specific staying portion 40 or in the vicinity thereof. It is good also as a structure which provides and operates the residence part side temperature sensor 43 installed in each residence part 40 based on this detection temperature ET.

  In the above embodiment, from the viewpoint of energy saving, the configuration in which the residence part side heating operation, the heat source side heating operation, and the circulation operation are not performed at the same time is exemplified, but the present invention is not limited to this, and the circulation operation and the residence are performed. The part side heating operation and the heat source side heating operation may be performed simultaneously. According to such a configuration, the amount of energy consumed for preventing freezing in the circulation flow path 2 increases, but freezing can be reliably prevented.

  In the said embodiment, when the intermittent operation mode was selected as the implementation method of circulation operation, the example which sets rest time T1, T2, T3 according to the rest time table shown to Fig.6 (a), (b) was illustrated. However, the present invention is not limited to this, for example, the correlation based on the detected temperature (water temperature BT) of the bath temperature sensor 29, the detected temperatures FT and ET of the heat source side temperature sensor 30 and the stay side temperature sensor 43, and the like. Alternatively, the rest periods T1, T2, and T3 may be set based on the formula.

  In the above embodiment, the staying portion side heater 41 is attached only to the staying portion 40 where hot water is highly likely to stay in the return side passage 22 and the outgoing side passage 23, and heating means (heating means) are attached to the other portions. ) Is not provided. Therefore, the above-described heat source system U is frozen as compared with the case where the heating means is attached to the entire return side flow path 22 and the forward flow path 23 even when the staying part side heater 41 has to be operated. Less electricity is consumed during prevention operation. Moreover, in the said embodiment, since it is set as the structure which attached the retention part side heater 41 only to the retention part 40 with which there exists a possibility that hot water may retain, attachment of the freeze prevention apparatus F is easy. Therefore, the antifreezing device F can be easily installed in the existing heat source system U.

  In the heat source device 1, the single control means 8 is used to detect the detected temperature FT of the heat source side temperature sensor 30 disposed in the heat source device 1 in the circulation channel 2, and the staying portion 40 or the staying portion disposed in the vicinity thereof. Based on the detected temperature ET of the side temperature sensor 43, the possibility of freezing of hot water is comprehensively determined, and the circulation operation, the staying portion side heating operation, and the heat source side heating operation are appropriately performed. Therefore, according to the control means 8, efficient operation control can be realized while minimizing the energy consumption required for preventing the freezing of hot water.

  Although the heat source device 1 described above exemplifies the example in which the heat source side temperature sensor 30 is provided in the heat source device main body 5, the present invention is not limited to this, and the heat source side temperature sensor 30 is not provided. A temperature sensor 29 or a temperature sensor provided for other applications may be substituted. According to such a configuration, the device configuration of the heat source device 1 can be further simplified.

  Moreover, although the heat source device 1 of the said embodiment illustrated the structure which can set the operation method in circulation operation mode suitably with a remote controller etc., this invention is not limited to this, For example, bath temperature sensor 29, The configuration may be such that the operation method is switched based on the temperature detected by a temperature sensor provided for another application. According to this configuration, the operation method in the circulation operation mode can be further optimized.

It is a conceptual diagram which shows one Embodiment of this invention. It is a conceptual diagram which shows the internal structure of the heat-source apparatus employ | adopted in embodiment shown in FIG. It is a flowchart which shows an example of the stay side freezing prevention operation implemented in the freezing prevention apparatus which is one Embodiment of this invention. It is a flowchart which shows the flow of operation | movement in the case where a cyclic operation check is implemented in the flowchart shown in FIG. It is a flowchart which shows the flow of operation | movement in the case where a circulation driving | operation is implemented in the flowchart shown in FIG. (A), (b) is a figure which respectively shows an example of the rest time table used for the setting of rest time in the circulation driving | operation shown in FIG. It is a flowchart which shows the flow of operation | movement when the residence part side heating operation is implemented in the flowchart shown in FIG. It is a flowchart which shows an example of the heat-source side freezing prevention operation implemented in the freezing prevention apparatus which is one Embodiment of this invention. (A), (b) is a conceptual diagram which shows typically the state before and after the connection of the control means and the residence part side temperature sensor which are employ | adopted in embodiment shown in FIG. 1, respectively. It is a flowchart which shows an example of the freezing prevention driving | operation implemented in the freezing prevention apparatus which is one Embodiment of this invention. It is a flowchart which shows the flow of operation | movement in case the heat source side heating operation is implemented in the flowchart shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source apparatus 2 Circulation flow path 3 Bathtub (heat consumption apparatus)
8 Control means 10 Combustion part 20 Inflow side piping 21 Outflow side piping 22 Return side flow path 23 Outward side flow path 26 Heat source side heater (heat source side heating means)
30 Heat source side temperature sensor (heat source side temperature detection means)
35 Drooping part 40 Retaining part 41 Retaining part side heater (Retaining part heating means)
43 Retention part side temperature sensor (retention part temperature detection means)
45, 46 Cable 50, 51 Connection terminal U Heat source system (heat consumption system)
F Freezing prevention device

Claims (13)

An anti-freezing device for preventing freezing of the liquid flow path for connecting the heat source device and the heat consuming device and supplying the heat energy generated in the heat source device to the heat consuming device via the liquid,
In the middle of the liquid flow path, there is a retention part that is assumed to retain the liquid when the liquid flow in the liquid flow path is stopped, and a flow path part in the apparatus disposed inside the heat source device,
The staying part is arranged at a place assumed to be lower in temperature than the installation atmosphere of the heat source device,
Inside or in the vicinity of the heat source device, a heat source side temperature detecting means, and a heat source side heating means capable of heating the vicinity of the in-apparatus flow path section or the in-apparatus flow path section,
The staying part or the vicinity of the staying part is provided with a staying part temperature detecting means and a staying part heating means for heating the staying part or the vicinity of the staying part,
The heat source side warming means operates under the condition that the heat source side temperature detection means is equal to or lower than a predetermined operation threshold temperature in a state where liquid flow in the liquid flow path is substantially stopped.
In a state where the liquid flow through the liquid channel is substantially stopped, the detection temperature of the stay side temperature detection means is not more than a predetermined stay side threshold temperature and / or is detected by the heat source side temperature detection means. On the condition that the detected temperature is equal to or lower than the heat source side threshold temperature, in the state where the heating by the heat source side heating means is stopped, the heating operation of the staying part by the staying part heating means and the liquid in the liquid channel Either or both of the flowing liquid operation can be performed,
The anti-freezing device, wherein the stay side threshold temperature and the operation threshold temperature are set to a temperature equal to or higher than a freezing temperature of the liquid, and the heat source side threshold temperature is set to a temperature equal to or higher than the operation threshold temperature. An anti-freezing device for preventing freezing of the liquid flow path for connecting the heat source device and the heat consuming device and supplying the heat energy generated in the heat source device to the heat consuming device via the liquid,
In the middle of the liquid flow path, there is a staying portion where the liquid is supposed to stay when the flow of the liquid in the liquid flow path is stopped, and an in-device flow path portion arranged inside the heat source device,
Inside or in the vicinity of the heat source device, a heat source side temperature detecting means, and a heat source side heating means capable of heating the vicinity of the in-apparatus flow path section or the in-apparatus flow path section,
The staying part or the vicinity of the staying part is provided with a staying part temperature detecting means and a staying part heating means for heating the staying part or the vicinity of the staying part,
In a state where the liquid flow in the liquid flow path is substantially stopped,
Heat source side heating means provided that the detection temperature detected by the heat source side temperature detection means is equal to or higher than a predetermined heat source side threshold temperature and the detection temperature of the stay side temperature detection means is lower than the predetermined stay side threshold temperature. It is possible to carry out either one or both of the heating operation of the staying part by the staying part heating means and the liquid passing operation for flowing the liquid in the liquid flow path in a state where the heating by is stopped. Freezing prevention device.   The anti-freezing device according to claim 1 or 2, wherein the staying portion is a portion arranged in a position lower than the installation position of the heat source device and the heat consuming device in the liquid channel. The liquid flow path has a hanging portion extending downward with respect to the heat source device and the heat consuming device;
The antifreezing device according to any one of claims 1 to 3, wherein the staying portion is a portion bent with respect to the hanging portion. The liquid channel is a channel connecting the heat source device and the heat consuming device installed inside the house, and the staying part is arranged outside the house,
The antifreezing device according to any one of claims 1 to 4, wherein the heat source side threshold temperature is higher than the staying portion side threshold temperature. The liquid channel is formed by a circulation channel that connects the heat source device and the heat consuming device,
The antifreezing device according to any one of claims 1 to 5, wherein the liquid can circulate in the liquid flow path by performing the liquid passing operation. The liquid channel is formed by a circulation channel that connects the heat source device and the heat consuming device,
Through the liquid flow operation, the liquid flow operation is preferentially performed on condition that the liquid can circulate in the liquid flow path.
The antifreezing device according to any one of claims 1 to 6, wherein the heating operation is performed on condition that the liquid cannot circulate in the liquid flow path by the liquid passing operation.   The liquid flow operation can be performed in any one of a plurality of operation modes selected from a plurality of operation modes including a continuous liquid flow mode for continuously flowing liquid and an intermittent liquid flow mode for passing liquid intermittently. The antifreezing device according to any one of claims 1 to 7, wherein In the middle of the liquid flow path, a liquid temperature detecting means for detecting the temperature of the liquid existing inside is provided,
It is possible to carry out a liquid-passing operation in an intermittent liquid-passing mode in which liquid is allowed to flow every predetermined pause time,
The freeze prevention apparatus according to any one of claims 1 to 8, wherein a pause time is set based on the temperature of the liquid detected by the liquid temperature detection means. Connection means for electrically connecting the residence side temperature detection means and / or the heat source side temperature detection means is provided,
The connection means is provided with a detection unit to which the stay side temperature detection unit and / or the heat source side temperature detection unit is electrically connected, and a compensation unit electrically independent of the detection unit,
The compensation unit is electrically connected to a part or all of the detection unit by electrically connecting the residence side temperature detection unit and / or the heat source side temperature detection unit to the connection unit. The antifreezing device according to any one of claims 1 to 9.   The antifreezing device according to any one of claims 1 to 10, wherein the heat consuming device is a bath.   A heat source device comprising the antifreezing device according to any one of claims 1 to 11.   A heat comprising the freeze prevention device according to any one of claims 1 to 11, a heat source device, and a heat consuming device to which heat energy generated in the heat source device is supplied via a liquid. Consumption system.

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