JP4025326B2 - Heat source machine - Google Patents

Description

  The present invention relates to a heat source device including a combustion section having a heat exchanger for heating and bathing and a burner for heating the heat exchanger.

  Conventionally, as this type of heat source device, a heat exchanger for heating and bath replenishment is provided with a heat absorption fin, a heat absorption tube for heating and a heat absorption tube for bath renewal that are penetrated so as to be in contact with each other. The bath is configured to be able to circulate hot water through a heating circuit connected to the heating radiator to the heat absorption pipe for heating, and to the bath heating circuit connected to the bathtub to the heat absorption pipe for bath heating. In addition, a bypass passage in parallel with the heating radiator is provided in the heating circuit so that the bath reheating heat absorption pipe and the heating can be used regardless of whether or not the heating operation is in progress. There is known one in which hot water is circulated through an endothermic tube (see, for example, Patent Document 1).

  In this case, at the time of independent operation of bathing without heating operation, hot water is circulated through the bypass pipe to the heat absorption pipe for heating, and the hot water flowing to the heat absorption pipe absorbs the combustion heat of the burner, Abnormal heating of the heat absorption pipe for heating is prevented. In addition, a kind of liquid heat exchanger is composed of a heat absorption pipe for heating and a heat absorption pipe for bath replenishment which are in contact with each other. Hot water flowing through the endothermic pipe is heated by combustion heat and heat transfer through the endothermic pipe for heating, and is efficiently chased.

  Here, in the thing of the said patent document 1, the bath return hot water temperature sensor which detects the temperature of the hot water returned from the bathtub to the heat absorption pipe for bath pursuit is provided, and the bath return hot water temperature sensor of the bath return operation temperature is provided at the time of bath chasing operation. The burner combustion is stopped when the detected temperature reaches the set hot water temperature for bathing. Although Patent Document 1 does not describe control of the burner combustion amount until the detected temperature of the bath return hot water temperature sensor reaches the set hot water temperature, generally, the burner is based on the additional heat demand. The amount of combustion is controlled. Specifically, the burner combustion amount is increased when the temperature detected by the bath return hot water temperature sensor is low, and the combustion amount is decreased when the detected temperature approaches the set temperature.

By the way, if the amount of combustion is controlled based only on the amount of heat required for additional heating regardless of whether or not it is in heating operation, the heating capacity is sufficiently ensured during simultaneous operation of the bath additional heating and heating. It may not be possible. Also, if the circulating water flow rate in the bath chase circuit decreases for some reason such as clogging of hair or piping resistance, the hot water temperature rises excessively in the heat sink for bath chase and the hot water sent to the bathtub becomes May be too high. Furthermore, when the circulating flow rate in the heating circuit decreases for some reason, boiling in the heat absorption pipe for heating may occur.
JP-A-9-318151 (0034-0037, FIG. 1 and FIG. 2)

  In view of the above points, the present invention, while ensuring both reheating capacity and heating capacity, the hot water temperature sent to the bathtub becomes too high due to a decrease in the circulation flow rate in the bath reheating circuit or heating circuit, An object of the present invention is to provide a heat source device that can prevent boiling in the heat absorption tube.

  In order to solve the above-described problems, the present invention provides a heat source device including a combustion unit having a heat exchanger for heating and bathing and a burner for heating the heat exchanger, wherein the heat exchanger It has a fin, a heat absorption pipe for heating and a heat absorption pipe for bathing that are penetrated so as to come into contact with the heat absorption fin, and circulates hot and cold water to the heat absorption pipe for heating through a heating circuit connected to the heating radiator. The hot water in the bathtub can be circulated through the heat sink pipe for bath bathing through a bath bathing circuit connected to the bathtub, and a bypass passage in parallel with the heating radiator is provided in the heating circuit. Detects the temperature of hot water sent from the heating endothermic pipe in the case where the hot water is circulated through the heat absorption pipe for bathing and the endothermic pipe for heating, regardless of whether or not the heating operation is in progress. A hot water sensor and a bath remedy Flow rate discriminating means for discriminating whether or not the circulating flow rate of hot water in the circuit is equal to or higher than a predetermined reference flow rate, and detection of the hot water temperature sensor regardless of whether or not the heating operation is performed during the bath reheating operation Combustion control means for controlling the combustion amount of the burner so that the temperature becomes a predetermined target temperature, and this target temperature can be variably set to a reference target temperature and a temperature lower than the reference target temperature. The first condition is that the circulation flow rate is determined to be equal to or higher than the reference flow rate, and the target temperature is changed to a temperature lower than the reference target temperature when the first condition is not satisfied. To do.

  According to the present invention, when the circulation flow rate of the bath reheating circuit is equal to or higher than the reference flow rate, the heating hot water temperature (detected temperature of the heating hot water temperature sensor) is set to a relatively high temperature (reference target temperature). Since the amount of combustion of the burner is controlled, the amount of combustion is increased, and the heat transfer from the heat absorption pipe for heating to the heat absorption pipe for bathing is also increased, so that a large reheating ability is obtained. Furthermore, even if the heating operation is performed during the bath reheating operation, the heating hot water temperature is maintained at the reference target temperature, so that the required heating capacity can be obtained, and the circulation flow rate of the heating circuit decreases for some reason. However, since the combustion amount is controlled based on the temperature of the hot water for the heating, boiling in the heat absorption pipe for heating is prevented. In addition, when the circulation flow rate of the bath reheating circuit is lower than the reference flow rate, the burner combustion amount is controlled so that the heating hot water temperature is relatively low, so the combustion amount is reduced and the heating Heat transfer from the heat absorption tube to the heat absorption tube for bathing is also reduced. Therefore, the hot water temperature is not excessively raised by the heat sink for bathing the bath, and the hot water temperature fed to the bathtub can be prevented from becoming too high.

  In addition, a bath return hot water temperature sensor that detects the temperature of hot water returned from the bathtub to the heat sink for bathing the bath is provided, and the detection temperature of the bath return hot water temperature sensor is determined based on the set hot water temperature for bath bathing. When the first condition and the second condition are both satisfied, the target temperature is set to the reference target temperature, and both the first and second conditions are set. If at least one of the conditions is not met, the temperature of the hot water returned from the bathtub to the heat sink for reheating the bath (bath return hot water temperature) can be set by setting the target temperature to be lower than the reference target temperature. Even when the temperature rises above the reference temperature, the target temperature is set to be low. Therefore, it is possible to prevent the temperature of the hot water sent out to the bathtub from becoming too high due to excessive heating in the end-of-bath heat sink when the bath return hot water temperature rises.

  In the present invention, the heating circuit includes a first state in which the bypass passage is opened and the passage portion reaching the heating radiator of the heating circuit is closed, and the passage portion reaching the heating radiator of the heating circuit while narrowing the bypass passage. There is a passage switching means that can be switched to the second state that opens, and the passage switching means is set to the first state when the bath reheating operation is not performed, and the bath renewal operation and heating are performed simultaneously. It is desirable that the passage switching means be in the second state. This makes it difficult for the heating heat medium to flow through the bypass passage during the simultaneous operation of bathing and heating, and prevents a reduction in heating capacity due to heat dissipation in the bypass passage.

  By the way, in the initial stage of operation when the temperature of the heating hot water is low, the burner combustion amount is increased to a predetermined upper limit value. However, during simultaneous operation of bath reheating and heating, both heat absorption for heating and bath reheating are performed. The heat is efficiently absorbed by the pipe, and the temperature rise of the heat-absorbing fins is delayed, and drain (condensation of water vapor in the combustion exhaust gas) is likely to occur. Here, the upper limit of the amount of combustion should be set to a relatively low value in order to reduce noise during single operation of bath reheating and heating, but the amount of burner burned during simultaneous operation of bath reheating and heating If the upper limit value is set higher than that during single operation, the temperature rise of the heat-absorbing fins is accelerated, and the generation of drain is suppressed.

  In the embodiment described later, the step corresponding to the flow rate discriminating means is step S12 in FIG. 2, and the step corresponding to the combustion control means is step S14 in FIG.

  FIG. 1 shows a one-can three-water channel type combined heat source apparatus in which a first combustion section 2 for hot water supply and a second combustion section 3 for heating and bathing are arranged in parallel in a single can body 1. Show. The first combustion unit 2 and the second combustion unit 3 are partitioned by a partition wall 4. The first combustion unit 2 is provided with a first heat exchanger 21 for hot water supply and a first burner 22 for heating the first heat exchanger 21, and the second combustion unit 3 has a second heat exchange for heating and bathing. A vessel 31 and a second burner 32 for heating the vessel 31 are provided. The first and second air supply chambers partitioned by the distribution plate 5 with respect to the arrangement portions of the first and second burners 22 and 32 are provided below the first and second combustion units 2 and 3. 23 and 33 are provided. The first and second combustion fans 24, 34 are connected to the first and second supply chambers 23, 33, and the combustion air from the combustion fans 24, 34 is supplied to the supply chambers 23, 33. 33 is supplied to each combustion section 2 and 3 through a number of distribution holes 5 a formed in the distribution plate 5. The combustion exhaust from the burners 22 and 32 is guided to the heat exchangers 21 and 31, and after exchanging heat with the heat exchangers 21 and 31, the exhaust gas is transferred to the common exhaust hood 6 above the heat exchangers 21 and 31. It flows and is discharged to the outside through an exhaust port 6 a formed in the exhaust hood 6.

  Each of the first and second burners 22 and 32 is configured by arranging a plurality of longitudinal unit burners 22a and 32a in the horizontal direction in the depth direction of the can 1 (the direction orthogonal to the plane of FIG. 1). The gas is supplied to the unit burners 22a and 32a through the nozzles 22c and 32c provided in the gas manifolds 22b and 32b for the burners 22 and 32, respectively. The gas supply passages 221 and 321 for the burners 22 and 32 connected to the gas manifolds 22b and 32b of the burners 22 and 32 are respectively provided with main valves 222 and 322 and proportional valves 223 and 323, respectively. Yes. These main valves 222 and 322 and proportional valves 223 and 323 are controlled by the controller 7 together with the combustion fans 24 and 34.

  The first heat exchanger 21 includes a plurality of endothermic fins 21 a arranged in the depth direction of the can 1, and upper and lower two-stage meandering endothermic pipes 21 b passing through the endothermic fins 21 a. An upstream water supply passage 8a and a downstream outlet hot water passage 8b are connected to the hot water supply heat absorption pipe 21b. The water supply path 8 a is provided with a flow rate sensor 81 and a flow rate adjustment valve 82 controlled by the controller 7, and further provided with a bypass passage 8 c connecting the water supply path 8 a and the hot water supply path 8 b on the downstream side of the flow rate adjustment valve 82. The bypass flow rate adjusting valve 83 controlled by the controller 7 is interposed in the bypass passage 8c. In addition, the first hot water temperature sensor 84 on the upstream side and the second hot water temperature sensor 85 on the downstream side of the joining portion of the bypass passage 8c are provided in the hot water channel 8b.

  Detection signals from the flow sensor 81, the first hot water temperature sensor 84, and the second hot water temperature sensor 85 are input to the controller 7. When the hot water tap 86 at the downstream end of the hot water outlet 8b is opened and water is passed through the first heat exchanger 21, the first combustion fan 24 is turned on when the flow rate detected by the flow rate sensor 81 exceeds a predetermined lower limit flow rate. While driving, the main valve 222 for the first burner 22 is opened to supply gas to the first burner 22, and the first burner 22 is ignited by spark discharge by a spark plug (not shown). Thereafter, the combustion amount of the first burner 22 is controlled via the proportional valve 223 so that the temperature detected by the first hot water temperature sensor 84 becomes a predetermined high temperature, and the first heat exchanger via the flow rate adjustment valve 82. The amount of water flowing to the bypass passage 8c via the bypass flow rate adjustment valve 83 (bypass mixing) is controlled so that the detected water temperature of the second hot water temperature sensor 85 becomes the preset hot water temperature set by the remote controller. Control).

  The second heat exchanger 31 includes a plurality of endothermic fins 31a arranged in the depth direction of the can body 1, two upper and lower meandering heating endothermic tubes 31b penetrating the endothermic fins 31a, and upper and lower endothermic heat sinks. The heat absorption pipe 31c has a meandering shape and passes through the heat absorption fin 31a so as to be in contact with the heat absorption pipe 31b between the pipes 31b. The heating endothermic pipe 31b is connected to the heating radiator 10 for bathroom heating or the like via the heating circuit 9, and the bath reheating endothermic pipe 31c is connected to the bathtub 12 via the bath reheating circuit 11. The In addition, in this embodiment, although the heat sink fin 21a of the 1st heat exchanger 21 and the heat sink fin 31a of the 2nd heat exchanger 31 are comprised by the common fin, these heat sink fins 21a and 31a are each different. Of course, it is possible to use fins.

  The heating circuit 9 includes a heating forward passage 9a that sends hot water heated by the heating heat absorption pipe 31b to the heating radiator 10, and a heating return passage 9b that returns hot water that has passed through the heating radiator 10 to the heat absorption pipe 31b. It is configured. In the heating return passage 9b, a systern 91 and a heating pump 92 controlled by the controller 7 are interposed, and hot water is supplied to the heating radiator 10 and the heating endothermic pipe 31b by the operation of the heating pump 92 via the heating circuit 9. Is circulated. Further, the heating circuit 9 is provided with a bypass passage 9c in parallel with the heating radiator 9 that connects the heating forward passage 9a and the cistern 91. In this embodiment, the bypass passage 9c is composed of a first and second pair of passages 9c1 and 9c2 that are parallel to each other. Then, in the heating forward passage 9a, the first state is located at the branch portion of the first bypass passage 9c1, the first bypass passage 9c1 is opened and the passage portion reaching the heating radiator 10 of the heating circuit 9 is closed, A three-way valve 93 controlled by the controller 7 is provided which is a passage switching means which can be switched to a second state in which the passage portion reaching the heating radiator 10 of the heating circuit 9 is closed while closing the one bypass passage 9c1. In addition, a heating hot water temperature sensor 94 that detects the temperature of the hot water sent from the heating heat absorption pipe 31b (heating hot water temperature) is provided on the upstream side of the heating outgoing passage 9a.

  By the way, when the three-way valve 93 is switched to the second state, the first bypass passage 9c1 is closed, but the second bypass passage 9c2 is opened, and the entire bypass passage 9c is restricted. The second bypass passage 9c2 is for ensuring a minimum circulating flow rate necessary for protecting the heating pump 92 (preventing idling) even when the heating radiator 10 is clogged. Yes, the pipe resistance is high, and the normal flow rate of hot water flowing through the second bypass passage 9c2 is extremely small. Note that when the three-way valve 93 is switched to the second state, leakage occurs in the valve portion for the first bypass passage 9c1 of the three-way valve 93, that is, the first bypass passage 9c1 is throttled. By doing so, the second bypass passage 9c2 can be omitted. It is also possible to configure a passage switching means with an opening / closing valve provided in the first bypass passage 9c1 and an opening / closing valve provided in a portion of the heating forward passage 9a on the downstream side of the branch portion of the bypass passage 9c.

  The bath chase circuit 11 includes a bath going-out passage 11a that sends hot water heated by the bath chase endothermic pipe 31c to the bathtub 12, and a bath return passage 11b that returns hot water from the bathtub 12 to the bath chase endothermic pipe 31c. It is configured. A bath pump 111 controlled by the controller 7 is installed in the bath return passage 11b, and hot water is supplied to the bathtub 12 and the bath-heating endothermic pipe 31c through the bath-heating circuit 11 by the operation of the bath pump 111. Circulated. Further, the pouring passage 11c branched from the hot water feeding passage 8b is connected to the bath return passage 11b through the check valve 112, and the pouring valve 113 controlled by the controller 7 provided in the pouring passage 11c is opened. By doing so, hot water heated by the first heat exchanger 21 can be poured into the bathtub 12. Further, in the bath return passage 11b, a bath flow rate sensor 114 for detecting the circulating flow rate of hot water in the bath reheating circuit 11 and the temperature of the hot water returned from the bathtub 12 to the heat retreating pipe 31c for bath reheating (bath return hot water temperature). And a bath return hot water temperature sensor 115 for detecting the above.

  Detection signals from the heating / outgoing hot water temperature sensor 94, the bath flow rate sensor 114, and the bath return hot water temperature sensor 115 are input to the controller 7. The controller 7 performs the control shown in FIG. 2 when an instruction for bathing or heating is performed by the remote controller. To describe this in detail, first, in step S1, the presence / absence of a bath-heating operation instruction is determined. When there is a bath-heating operation instruction, the presence / absence of a heating operation instruction is determined in step S2. When there is a heating operation instruction, that is, during simultaneous operation of heating and bath renewal, the three-way valve 93 is switched to the second state in step S3, the bypass passage 9c is throttled and the heating circuit 9 dissipates heat. The passage portion reaching the vessel 10 is opened, and the upper limit value Gmax of the combustion amount of the second burner 32 is set to a relatively high value GH (for example, 15000 kcal / h) in step S4. When there is no operation instruction for heating, that is, when the bath reheating operation is independent, the three-way valve 93 is switched to the first state in step S5, the bypass passage 9c is opened and the heating radiator 10 of the heating circuit 9 is opened. In step S6, the upper limit value Gmax of the combustion amount of the second burner 32 is set to a relatively low value GL (for example, 12000 kcal / h).

  When the Gmax setting process in step S4 or S6 is performed, both the heating and bath pumps 92 and 111 are driven in step S7, and then the bath additional detection detected by the bath flow sensor 114 in step S8. It is determined whether or not the circulation flow rate (bath circulation flow rate) Q of hot water in the firing circuit 11 is equal to or higher than a predetermined lower limit flow rate QL set for confirming the operation of the bath pump 111, and when Q ≧ QL, In step S9, the second combustion fan 34 is driven, and the main valve 322 for the second burner 32 is opened to ignite the second burner 32.

  Next, in step S10, it is determined whether or not the detected temperature (bath return hot water temperature) TF of the bath return hot water temperature sensor 115 is lower than the set hot water temperature TFS for bath reheating. If TF <TFS, the process proceeds to S11. In step S12, it is determined whether or not the bath return hot water temperature TF is lower than a reference temperature TFK that is set a few degrees (eg, 2 ° C.) lower than the set hot water temperature. If TF <TFK, the bath circulation flow rate Q is determined in step S12. Is greater than or equal to a predetermined reference flow rate QK. The reference flow rate QK will be described later in detail. If Q ≧ QK, the target temperature TDM is set to the reference target temperature TDK in step S13, and the detected temperature (heating hot water temperature) TD of the heating hot water temperature sensor 94 becomes the target temperature TDM in step S14. The combustion amount of the second burner 32 is controlled via the proportional valve 323. Note that the reference target temperature TDK is basically set to a temperature (for example, 80 ° C.) that matches the required hot water temperature of the heating radiator 10, but the bath reheating operation in which hot water is not circulated through the heating radiator 10 is performed. In some cases, it is desirable to set the reference target temperature TDK to a temperature (for example, 85 ° C.) higher than the required hot water temperature of the heating radiator 10 so that the bath replenishment ability can be enhanced.

  Thus, when the bath circulation flow rate Q is equal to or higher than the reference flow rate QK, while the bath return hot water temperature TF is lower than the reference temperature TFK, the second heating hot water temperature TD is set to a relatively high temperature that is the reference target temperature TDK. Since the amount of combustion in the burner 32 is controlled, the amount of combustion is increased, and the heat transfer from the heating endothermic tube 31b to the bath endothermic endothermic tube 31c is increased, thereby obtaining a large pursuit ability. Further, even if the heating operation is performed during the bath reheating operation, the heating hot water temperature TD is maintained at the reference target temperature TDK, and the bypass passage 9c is throttled to suppress the heat radiation loss in the bypass passage 9c. The required heating capacity can be obtained. Further, even if the circulation flow rate of the heating circuit 9 decreases for some reason, the combustion amount is controlled based on the heating hot water temperature TD, so that boiling in the heating endothermic pipe 31b is prevented.

  By the way, when the bath return hot water temperature TF becomes equal to or higher than the reference temperature TFK, or when the bath circulation flow rate Q decreases due to clogging of the hair, the second burner 32 so that the heating hot water temperature TD becomes the reference target temperature TDK. When the amount of combustion is controlled, the hot water temperature rises excessively in the bath reheating endothermic pipe 31c, and the hot water temperature sent to the bathtub 12 may become too high. Here, since the heat absorption pipe 31b for heating is provided so as to sandwich the heat absorption pipe 31c for bathing from above and below, it absorbs heat more easily than the heat absorption pipe 31c for bathing, and the heat absorption pipe 31c for bathing. The amount of heat absorbed is about 1/3 of the combustion amount of the second burner 32. Assuming that the amount of heat absorbed by the heat absorption pipe 31c for bath reheating when the combustion amount of the second burner 32 is 15000 kcal / h is 6000 kcal / h (100 kcal / min) with a margin, the bath return hot water temperature TF is 40 ° C. In order to keep the temperature of the hot water sent out from the end-of-bath heat sink 31c below 90 ° C., it is necessary to set the bath circulation flow rate to 2 liters or more per minute. Accordingly, the reference flow rate QK is set to the circulation flow rate required for preventing overheating as described above.

  If it is determined in step S11 that the bath return hot water temperature TF is equal to or higher than the reference temperature TFK, or if it is determined in step S12 that the bath circulation flow rate Q is less than the reference flow rate QK, the process proceeds to step S15. It is determined whether or not the circulation flow rate Q is equal to or higher than the lower limit flow rate QL. If Q ≧ QL, the target temperature TDM is lower than the reference target temperature TDK by a predetermined temperature ΔT (for example, 15 ° C.) in step S16. Then, the process proceeds to step S14. Thus, when TF ≧ TFK or when Q <QK, the combustion amount of the second burner 32 is controlled so that the heating hot water temperature TD becomes TDK−ΔT. As a result, the amount of combustion is reduced, and the heat transfer from the heat absorption pipe 31b for heating to the heat absorption pipe 31c for bathing is also reduced, and the hot water temperature is not excessively raised in the heat sinking pipe 31c for bathing. It is prevented that the hot water temperature sent out becomes too high.

  If it is determined in step S10 that the bath return hot water temperature TF is equal to or higher than the set hot water temperature TFS, or if it is determined in step S15 that the bath circulation flow rate Q is less than the lower limit flow rate QL, the process proceeds to step S17. Stops whispering. By this stop processing, the bath pump 111 and the heating pump 92 are stopped and the second burner 32 is extinguished when the bath reheating operation is performed alone, and the bath pump 111 is stopped when the bath reheating operation and heating are performed simultaneously. Then, it progresses to the step of S23 mentioned later at the time of heating independent operation. Even if the second burner 32 is burned in a state where the circulation of hot water in the bath reheating circuit 11 is stopped, the heat of the heat relieving pipe 31c for bath retreating is taken away by the hot water flowing in the heat absorption pipe 31b. Boiling in the reheating endothermic tube 31c does not occur.

  If it is determined in step S1 that there is no bath reheating operation instruction, the process proceeds to step S18 to determine whether there is a heating operation instruction. When there is a heating operation instruction, that is, when heating is performed alone, the three-way valve 93 is switched to the second state in step S19 to throttle the bypass passage 9c and to the heating radiator 10 of the heating circuit 9. Further, the upper passage value Gmax of the combustion amount of the second burner 32 is set to a relatively low value GL in step S20. Next, in step S21, the heating pump 92 is driven (the bath pump 111 is stopped), and in step S22, the second combustion fan 34 is driven, and the main valve 322 for the second burner 32 is opened. Then, the second burner 32 is ignited. Then, in step S23, the combustion amount of the second burner 32 is controlled via the proportional valve 323 so that the heating hot water temperature TD becomes the target temperature TDM. In this case, the target temperature TDM is set to a temperature that matches the required hot water temperature of the heating radiator 10.

  By the way, in the initial stage of operation when the heating hot water temperature TD is low, the combustion amount of the second burner 32 is increased to the upper limit value Gmax, but during the simultaneous operation of bath reheating and heating, for heating and bath reheating. The heat absorption pipes 31b and 31c efficiently absorb heat, the temperature rise of the heat absorption fins 31a is delayed, and drainage is likely to occur. However, in the present embodiment, the upper limit value Gmax of the combustion amount of the second burner 32 is set to a relatively high value GH during the simultaneous operation of the bath reheating and heating, so that the temperature rise of the heat absorption fins 31a becomes faster. , The generation of drain is suppressed. At the time of bathing or heating alone, the upper limit value Gmax is set to a relatively low value GL, which is to reduce noise.

  In the above embodiment, the decrease temperature ΔT with respect to the reference target temperature TDK used for changing the setting of the target temperature TDM in step S16 is made constant, but ΔT depends on the deviation between the reference flow rate QK and the bath circulation flow rate Q. May be changed. According to this, the reference flow rate QK is set relatively high, the target temperature TDM can be gradually decreased before the bath circulation flow rate Q is greatly reduced, and the rise of the hot water temperature delivered to the bathtub 12 is more reliably ensured. Can be prevented.

  Further, without using the flow rate sensor 114, the bath reheating circuit 11 is provided with a first water flow switch that is turned on when the flow rate is equal to or higher than the lower limit flow rate QL and a second water flow switch that is turned on when the flow rate is higher than the reference flow rate QK. It is determined whether or not the first water flow switch is turned on in step. When the first water flow switch is turned on, the process proceeds to step S9, and whether or not the second water flow switch is turned on in step S12. When the second water flow switch is off, the process proceeds to step S15, where it is determined whether or not the first water flow switch is turned on. When the first water flow switch is off, the process proceeds to step S16. You may make it go. According to this, the cost is lower than when the flow sensor 114 is used.

  The step S15 is a step provided for fail-safe against the failure of the bath pump 111 after the burner ignition, and can be omitted. In this case, the first water flow switch is omitted, it is determined whether or not the second water flow switch is turned on in step S8, and the process proceeds to step S9 when the second water flow switch is turned on. In step S12, it may be determined whether or not the second water flow switch is turned on, and the process may proceed to step S16 when the second water flow switch is turned off. According to this, further cost reduction can be achieved.

  As described above, the embodiment in which the present invention is applied to the single-can type heat source device in which the first combustion section 2 for hot water supply and the second combustion section 3 for heating and bath replenishment are housed in a single can body 1 has been described. However, the present invention is also applied to a two-can type heat source device in which the first combustion unit 2 and the second combustion unit 3 are housed in separate cans, and further to a heat source device in which the first combustion unit 2 is omitted. The invention can be applied.

Explanatory drawing which shows the structure of the heat-source equipment of embodiment of this invention. The flowchart which shows control of heating and bath reheating.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Combustion part, 31 ... Heat exchanger for heating and bath pursuit, 31a ... Endothermic fin, 31b ... Endothermic pipe for heating, 31c ... Endothermic pipe for bath pursuit, 32 ... Burner, 7 ... Controller, 9 ... Heating Circuit 9c: Bypass passage 93: Three-way valve (passage switching means) 94 Heating hot water temperature sensor 11 Bath reheating circuit 114 Flow rate sensor 115 Bath return hot water temperature sensor 12 Bath

Claims (4)

A heat source device comprising a combustion section having a heat exchanger for heating and bathing and a burner for heating the heat exchanger, the heat exchanger penetrating the heat absorption fin and the heat absorption fin so as to contact each other A heat absorption pipe for heating and a heat absorption pipe for replenishing a bath, and hot water can be circulated to the heat absorption pipe for heating through a heating circuit connected to the heating radiator, and a bath addition connected to the bathtub. Whether bath water can be freely circulated through the heat sink for bath reheating through the fired circuit, and a bypass passage in parallel with the heating radiator is provided in the heating circuit to determine whether the heater is in heating operation during the bath reheating operation. Regardless of whether the hot water is circulated through the heat sink for bathing and the heat sink for heating,
A hot water temperature sensor for detecting the temperature of hot water sent from the heat absorption pipe for heating,
Flow rate discriminating means for discriminating whether or not the circulating water flow rate in the bath reheating circuit is equal to or higher than a predetermined reference flow rate;
Combustion control means for controlling the combustion amount of the burner so that the detected temperature of the heating hot water temperature sensor becomes a predetermined target temperature regardless of whether the heating operation is in progress during the bath reheating operation,
The target temperature can be variably set to a reference target temperature and a temperature lower than the reference target temperature, and the first condition is that the flow rate determining means determines that the circulating flow rate is equal to or higher than the reference flow rate. If the condition is not satisfied, the target temperature is set and changed to a temperature lower than the reference target temperature.   A bath return hot water temperature sensor for detecting a temperature of hot water returned from the bathtub to the bath-heating heat sink, and a detection temperature of the bath return hot-water temperature sensor is determined based on a set temperature of the bath-heating water bath When the first condition and the second condition are both satisfied, the target temperature is set to the reference target temperature, and the first and second conditions are set to be lower than the reference temperature. The heat source machine according to claim 1, wherein when at least one of the two conditions is not satisfied, the target temperature is set to a temperature lower than the reference target temperature.   A first state in which the bypass passage is opened in the heating circuit and a passage portion reaching the heating radiator of the heating circuit is closed, and a second state in which the bypass passage is narrowed and the passage portion reaching the heating radiator in the heating circuit is opened. The passage switching means can be switched freely, and the passage switching means is set to the first state when the bath reheating operation is not performed, and the passage switching means is set to the first state when the bath reheating operation and heating are performed simultaneously. The heat source apparatus according to claim 1, wherein the heat source apparatus is in a state of 2.   4. The burn-up and heating operation at the same time is set such that an upper limit value of the burner combustion amount is set higher than that at the time of bath-heating or heating operation alone. The heat source machine described in 1.

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