JP5133774B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater using a heat pump unit for boiling hot water stored in a hot water storage tank.

  Conventionally, in a water heater using a heat pump unit to boil hot water stored in a hot water storage tank, during boiling operation, water is taken out from the lower part of the hot water tank and heated to a predetermined boiling temperature by the heat pump unit. The raised hot water is circulated by the boiling circulation pump so as to be taken into the upper part of the hot water storage tank, so that the difference in specific gravity between the hot water and the water at different temperatures causes the hot water between the upper hot water and the lower hot water. The hot water is stored in order from the upper side in the hot water storage tank without being mixed with water through the mixed layer of hot water and water formed in the water.

  Hot water stored in the hot water storage tank is taken out from the upper part of the hot water storage tank and used for hot water supply, and also used as a heat source for heat load such as reheating and heating of the hot water in the bathtub.

  In addition, a tank unit having a hot water storage tank and a heat pump unit are installed separately. Between these, a boiling forward path connecting the lower part of the hot water storage tank and the heat pump unit, an upper part of the heat pump unit and the hot water storage tank, Is connected to a return path for boiling, which constitutes a boiling circuit. In this elevating circuit, the elevating circulation pump may be provided in the elevating path on the tank unit side, or may be provided in the elevating path on the heat pump unit side. Then, by operating the circulating pump for boiling, the water in the lower part of the hot water storage tank is circulated in a direction returning from the forward heating path to the upper part of the hot water tank through the heat pump unit and the return return path for boiling. It is possible to operate without boiling.

  By the way, when the hot water supply device is installed, when connecting the piping of the boiling forward path and the piping of the boiling return path between the tank unit and the heat pump unit, the piping is reversely connected. May end up. In particular, it tends to occur when piping connecting the tank unit and the heat pump unit is buried in the ground or concrete.

  When the boiling operation is performed in the trial operation after the installation of the hot water supply device, when the boiling circulation pump is on the tank unit side and the boiling circuit is reversely connected, water is taken out from the lower part of the hot water storage tank. Since the water is heated by the heat pump unit and returned to the upper part of the hot water storage tank, the water and hot water on the tank unit side are the same as normal, but the water and hot water on and off the heat pump unit are normal. Would be the opposite. Also, if the boiling circulation pump is on the heat pump unit side and the boiling circuit is reversely connected, hot water is taken out from the upper part of the hot water storage tank and boiled up by the heat pump unit. Since the entire hot water flow is reversed and the entire water in the hot water tank is warmed by the hot water returned to the lower part of the hot water tank, the hot water of a predetermined boiling temperature is added to the upper part of the hot water tank. It is not possible to store hot water in order from the side.

  Therefore, as a method of detecting that the boiling circuit is reversely connected, a feed water temperature detection sensor provided on the inlet side of the heat exchanger for boiling of the heat pump unit and the outlet side of the heat exchanger for boiling There is a method of using a boiling temperature detection sensor provided in. In this method, when the boiling circulation pump is on the tank unit side, if it is reversely connected, the flow of hot water on the heat pump unit side is reversed, and the hot water boiled by the heat pump unit is detected. Since it detects with a sensor, reverse connection is detectable because the temperature detected with this feed water temperature detection sensor becomes more than predetermined temperature higher than the temperature detected with a boiling temperature detection sensor (for example, refer patent document 1).

  Also, when the boiling circulation pump is on the heat pump unit side, the flow of hot water on the heat pump unit side is not reversed, so that the feed water temperature detection sensor is the same as when the boiling circulation pump is on the tank unit side. And reverse connection cannot be detected using boiling temperature sensor.

  Therefore, in the case where the boiling circulation pump is on the heat pump unit side, the remaining hot water amount detection for detecting the remaining hot water amount, for example, 60 liters, using a plurality of remaining hot water amount detection sensors for detecting the remaining hot water amount in the hot water storage tank. If the temperature detected by the sensor reaches a predetermined boiling temperature within a predetermined time after hot water is stored from the upper part of the hot water storage tank, normal connection is established. If the upper temperature is not reached, reverse connection is detected.

However, since the boiling flow rate by the heat pump unit is about 1 liter per minute, even if the remaining hot water amount detection sensor for detecting the remaining hot water amount, for example, 60 liters is used, it is more than 1 hour to determine the reverse connection. It takes time.
Japanese Patent No. 3969383 (page 3-5, Fig. 1-3)

  In the conventional hot water supply apparatus, when the boiling circulation pump is on the heat pump unit side, there is a problem that it takes time to determine reverse connection of the boiling circuit between the tank unit and the heat pump unit.

  The present invention has been made in view of such points, and even when the boiling-up circulation pump is on the heat pump unit side, the tank unit, the heat pump unit, It is an object of the present invention to provide a hot water supply apparatus that can reliably determine in a short time that the boiling circuit is in a reverse connection state.

  The hot water supply apparatus according to claim 1 is a tank unit having a hot water storage tank, a heat pump unit having a boiling heat exchanger, a water supply path for supplying water to a lower portion of the hot water storage tank, the hot water storage tank, and the boiling heat. A boiling forward path connecting the inlet side of the exchanger, a boiling return path connecting the hot water storage tank and the outlet side of the boiling heat exchanger, and the heat pump unit side provided on the heat pump unit side A boiling circulation pump that circulates hot water in a direction from the boiling forward path to the boiling return path through the boiling heat exchanger, and is provided in the boiling forward path on the heat pump unit side. A feed water temperature detecting means, a boiling circuit having a boiling temperature detecting means provided in the return path for boiling on the heat pump unit side, and a tank unit side. Switching means for switching the connection of the return path for boiling to the hot water storage tank side and the drainage path side for draining to the outside, and the reverse of the boiling circuit between the tank unit and the heat pump unit When detecting the connection, the heat pump unit and the circulating pump for boiling are operated, and after the detected temperature of the boiling temperature detecting means is equal to or higher than a predetermined boiling temperature, the operation is stopped for a predetermined time. A control unit that switches to the drainage path side by the switching unit and drains the water, and determines that the boiling circuit is in a reverse connection state if the detected temperature of the feed water temperature detecting unit becomes equal to or higher than a predetermined boiling temperature during the period; It is equipped with.

  The hot water supply device according to claim 2 is the hot water supply device according to claim 1, wherein the controller detects the temperature detected by the feed water temperature detecting means when detecting reverse connection of the boiling circuit between the tank unit and the heat pump unit. If the detected temperature of the feed water temperature detecting means falls below the predetermined boiling temperature after the detected temperature of the boiling temperature detecting means falls below the predetermined boiling temperature after the temperature rises above the predetermined boiling temperature, It is determined that the boiling circuit is in a reverse connection state.

  According to a third aspect of the present invention, there is provided the hot water supply apparatus according to the first or second aspect, wherein the control section switches the switching means to the drainage path side also in the air venting control of the boiling circuit.

  According to the hot water supply device of claim 1, even when the boiling circulation pump is on the heat pump unit side, the water supply temperature detection means and the boiling temperature detection means are used to provide a difference between the tank unit and the heat pump unit. The reverse connection of the boiling circuit can be detected, and after the heat pump unit and the circulating pump for boiling are operated and the detected temperature of the boiling temperature detecting means is higher than a predetermined boiling temperature, the operation is stopped. On the tank unit side, the connection of the return path for boiling is switched to the drainage path side by the switching means for a predetermined time so that the water is drained, and if the detected temperature of the feed water temperature detecting means exceeds the predetermined boiling temperature during that time, the boiling circuit Therefore, it is possible to reliably detect reverse connection in a shorter time than in the past.

  According to the hot water supply device of the second aspect, in addition to the effect of the hot water supply device of the first aspect, when detecting reverse connection of the boiling circuit between the tank unit and the heat pump unit, If the detected temperature of the feed water temperature detecting means falls below the predetermined boiling temperature after the detected temperature of the boiling temperature detecting means falls below the predetermined boiling temperature after the detected temperature becomes equal to or higher than the predetermined boiling temperature. Since it determines with the going-up route for boiling of a raising circuit and the return route for raising being in a reverse connection state, the detection precision of reverse connection can be improved.

  According to the hot water supply device according to claim 3, in addition to the effect of the hot water supply device according to claim 1 or 2, in the air venting control of the boiling circuit, the switching means is switched to the drainage path side. The circuit air bleeding operation path and the reverse connection detection path can be shared, and simplification and cost reduction can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  3 and 4 show a normal connection state of the hot water supply apparatus.

  The hot water supply device 11 includes a tank unit 12 and a heat pump unit 13 for boiling hot water, and has a function of pursuing bathtub water stretched on the bathtub 14.

  The tank unit 12 includes a hot water storage tank 17 for storing hot water. The hot water storage tank 17 includes an upper position of the hot water storage tank 17 and a 1/5 position and a 2/5 position corresponding to the capacity from the upper portion of the hot water storage tank 17. The thermistors 18a to 18f as temperature detecting means for detecting the hot water temperature in the hot water storage tank 17 are disposed at the 3/5 position, the 4/5 position, and the lower position of the hot water storage tank 17, respectively.

  A water supply path 20 connected to a water supply source such as a water pipe is connected to the lower part of the hot water storage tank 17. The water supply path 20 is provided with a pressure reducing valve 21 for reducing the water supply pressure and a check valve 22 for preventing backflow.

  An upper extraction pipe 25 is connected to the upper part of the hot water storage tank 17, and an intermediate extraction pipe 26 is provided between the thermistor 18b at the 1/5 position and the thermistor 18c at the 2/5 position, which is an intermediate position in the vertical direction of the hot water storage tank 17. It is connected. A check valve 27 that allows the flow of hot water only in the direction of taking out the hot water is disposed on the distal end side of the intermediate portion extraction pipe 26. The upper outlet pipe 25 and the intermediate outlet pipe 26 are connected to a mixing valve 28 that is an electric valve, and the mixing ratio of the hot water taken out from the upper outlet pipe 25 and the hot water taken out from the intermediate outlet pipe 26 by the mixing valve 28. Adjust. The mixing ratio that can be adjusted by the mixing valve 28 includes the case where either one is 100% and the other is 0%.

  The mixing valve 28 is connected to a hot water supply pipe 29 for supplying hot water taken out. The hot water supply pipe 29 is provided with an extraction temperature sensor 30 as an extraction temperature detection means for detecting the temperature of the hot water. The upper extraction pipe 25, the intermediate extraction pipe 26, the mixing valve 28, the hot water supply pipe 29, and the like form an extraction path 31 for extracting hot water from the hot water storage tank 17.

  Further, the hot water supply pipe 29 (extraction path 31) and the water supply path 20 are connected to a mixing valve 34 for hot water supply and a mixing valve 35 for a bathtub, respectively. These mixing valves 34 and 35 mix hot water from the hot water supply pipe 29 and water from the water supply path 20 to supply hot water at a predetermined temperature. The mixing ratio that can be adjusted by the mixing valves 34 and 35 includes the case where either one is 100% and the other is 0%.

  The hot water supply pipe 29 and the water supply path 20 connected to the mixing valves 34 and 35 are provided with check valves 36 and 37 for restricting the backflow to the hot water supply pipe 29 side and the water supply path 20 side, respectively.

  The hot water mixing valve 34 supplies hot water having a set hot water temperature set by, for example, a main remote controller installed in a kitchen or the like, a bathroom remote controller installed in a bathroom, or the like. A hot water supply passage 38 for supplying hot water to a predetermined hot water supply place is connected to the mixing valve 34 for hot water supply, and a flow rate sensor 39 for measuring the flow rate and a hot water supply temperature sensor 40 for detecting the hot water supply temperature are disposed in the hot water supply passage 38. ing.

  The mixing valve 35 for the bathtub supplies hot water at a hot water set temperature set by, for example, a main remote controller installed in a kitchen or the like, a bathroom remote controller installed in a bathroom, etc. Supply hot water at a temperature according to the ability to repel water. The mixing valve 35 for the bathtub is connected with a hot water supply passage 41 for supplying hot water to the bathtub 14, and the hot water supply passage 41 for hot water supply includes a hot water supply temperature sensor 42 for detecting the hot water supply temperature and a water supply electromagnetic valve for opening and closing the flow path. Is provided.

  Further, on the downstream side of the connection point of the mixing valves 34 and 35 of the hot water supply pipe 29 (extraction path 31), there is a check valve 44 for restricting the backflow to the upstream side, and the bathtub water of the bathtub 14 on the heat load side. A return return pipe 46 for returning hot water that has passed through the additional heat exchanger 45 from the intermediate part extraction pipe 26 to the hot water storage tank 17 is connected via an additional heat exchanger 45 for heat exchange. In the return pipe 46 for remedy, hot water is taken out from the hot water storage tank 17 through the take-out path 31 and hot water that has passed through the heat exchanger 45 for remedy is passed through the return pipe 46 for remedy and the intermediate take-out pipe 26 to the hot water storage tank. A recirculation circulation pump 47 for circulating hot water so as to return to the middle part of 17 is provided. In addition, the return pipe for remedy 46 and the intermediate part take-out pipe 26 form an intake path 49 for returning hot water that has passed through the heat exchanger 45 for remedy to the intermediate part of the hot water storage tank 17 at the time of remedy. Has been.

  A chasing circuit 50 is configured including the take-out path 31, the chasing heat exchanger 45, the chasing circulation pump 47, and the taking-in path 49.

  In addition, the memorial heat exchanger 45 and the bathtub 14 are connected by a circulation path 54 for the bathtub. The bathtub circulation path 54 takes in the bathtub water from the bathtub 14 and leads it to the heat exchanger 45 for bathing, and returns the bathtub water that passes through the heat exchanger 45 for bathing to the bathtub 14. A forward pipe 56 is provided. The return pipe 55 for the bathtub includes a thermistor 57 that detects the temperature of the bathtub water taken in from the bathtub 14, a pressure sensor 58 that detects the water level of the bathtub 14, and a switching valve for switching the flow path when automatically filling the bathtub 14. 59, a bath circulation pump 60 for circulating bath water, and a flow switch 61 for detecting the bath water circulation are provided. The bathtub forward pipe 56 is provided with a thermistor 62 that detects the temperature of the bathtub water introduced into the bathtub 14.

  The switching valve 59 is connected to a hot water supply passage 41 for the bathtub, and hot water supplied from the hot water supply passage 41 for the bathtub is supplied as one pipe of the return pipe 55 for the bathtub or two pipes of the return pipe 55 for the bathtub and the forward pipe 56 for the bathtub. Hot water can be supplied to the tub 14 through.

  In addition, a relief valve 65 that releases excess pressure during boiling is connected to the upper outlet piping 25 of the hot water storage tank 17, and this relief valve 65 is connected to a drainage passage 66 that drains to the outside.

  The hot water storage tank 17 of the tank unit 12 and the heat pump unit 13 are connected by a boiling circuit 70. This boiling circuit 70 has a boiling forward path 71 that connects the hot water storage tank 17 and the inlet side of the heat pump unit 13, and a boiling return path 72 that connects the hot water storage tank 17 and the outlet side of the heat pump unit 13. doing. The boiling forward path 71 is configured by connecting a pipe 71a in the tank unit 12 and a pipe 71b in the heat pump unit 13 by a pipe 71c. The boiling return path 72 is configured by connecting a pipe 72a in the tank unit 12 and a pipe 72b in the heat pump unit 13 by a pipe 72c.

  The piping 71 a of the boiling forward passage 71 is connected to the lower part of the hot water storage tank 17. The pipe 71a is provided with a drain valve 73 that drains the water in the hot water storage tank 17 to the outside.

  A switching valve 75, which is a distribution valve as switching means, is connected to the piping 72a of the return path 72 for boiling. This switching valve 75 is connected to the upper return pipe 76 connected to the upper part of the hot water storage tank 17, the lower return pipe 77 connected to the lower part of the hot water storage tank 17 through the pipe 71a of the boiling forward passage 71, and the drainage path 66. A drainage pipe 78 to be connected is connected. This switching valve 75 enables switching so that any one of the upper return pipe 76, the lower return pipe 77, and the drain pipe 78 is connected to the heat pump unit 13 side.

  The heat pump unit 13 also has a refrigerant circuit including a boiling heat exchanger 82 that functions as a compressor and a condenser, an expansion valve, an evaporator, and the like. A boiling circuit 70 is connected to the boiling heat exchanger 82 of the heat pump unit 13. In the piping 71b on the inlet side of the heating heat exchanger 82 of the heat pump unit 13, the water in the lower part of the hot water storage tank 17 is circulated from the boiling forward path 71 side to the boiling return path 72 side. A pump 83 is provided. Further, a feed water temperature detection sensor 84 as a feed water temperature detecting means for detecting the temperature of the water taken into the boiling forward path 71 is disposed in the piping 71b on the inlet side of the boiling heat exchanger 82, The piping 72b on the outlet side of the heat exchanger 82 is provided with a boiling temperature detection sensor 85 as a boiling temperature detection means for detecting the temperature of hot water that has passed through the boiling heat exchanger 82.

  Further, the hot water supply device 11 includes a control unit 91 that controls the operation of the hot water supply device 11. The control unit 91 has a function of air bleeding control of the boiling circuit 70, a function of detecting reverse connection of the boiling circuit 70 between the tank unit 12 and the heat pump unit 13, and the like.

  In the function of air bleeding control of the boiling circuit 70, the switching valve 75 switches to a path connecting the heat pump unit 13 side and the drain pipe 78.

  In the function of detecting the reverse connection of the boiling circuit 70, the heat pump unit 13 and the circulating pump 83 for boiling are operated, and the detected temperature of the boiling temperature detection sensor 85 becomes equal to or higher than a predetermined boiling temperature, and the operation is stopped. After that, the switching valve 75 is switched to a path connecting the heat pump unit 13 side and the drainage path 66 for a predetermined time to drain the water, and if the detected temperature of the feed water temperature detection sensor 84 becomes a predetermined boiling temperature or higher during that time, It is determined that the upper circuit 70 is in a reverse connection state. In order to judge more strictly, after the detected temperature of the feed water temperature detection sensor 84 becomes equal to or higher than the predetermined boiling temperature, the feed water temperature is lowered after the detected temperature of the boiling temperature detection sensor 85 falls below the predetermined boiling temperature. If the detection temperature of the detection sensor 84 falls below a predetermined boiling temperature, it is determined that the boiling circuit 70 is in a reverse connection state.

  Next, the operation of the present embodiment will be described.

  First, water supply and air bleeding after the hot water supply device 11 is installed will be described.

  The relief valve 65 and the valves 28, 34, 35, 75 are opened, and water is supplied through the water supply path 20. As a result, water is supplied into the hot water storage tank 17 and also supplied to each pipe connected to the hot water storage tank 17, and the air that escapes from the hot water storage tank 17 and the inside of the pipe is discharged from the relief valve 65 to the outside. The

  Since the memorial circuit 50 is disposed close to the hot water storage tank 17, water is easily supplied into the memorial circuit 50 by supplying water to the hot water storage tank 17, and the air in the memorial circuit 50 is easily released automatically. On the other hand, in the boiling circuit 70, the pipes 71c and 72c between the hot water storage tank 17 and the heat pump unit 13 are often long, and sometimes the so-called ceiling rolling pipe or torii pipe is used. However, there is a case where the water in the boiling circuit 70 is not sufficiently supplied by the water supply alone, and the air in the boiling circuit 70 is difficult to escape automatically.

  Therefore, in the state where water is supplied to the hot water storage tank 17 and the supply water pressure from the water supply path 20 is applied, the function of the air venting control of the control unit 91 causes the black pipe indication and arrow in FIG. 3 (or FIG. 1). Then, the switching valve 75 switches to a path connecting the heat pump unit 13 side and the drainage path 66.

  As a result, the water supplied from the water supply path 20 by the water supply pressure from the water supply path 20 causes the hot water storage tank 17, the piping 71a, 71c, 71b of the boiling forward path 71, and the boiling circulation pump of the heat pump unit 13 to rise. 83, the heat exchanger 82 for boiling, the piping 72b, 72c, 72a of the boiling return path 72, the switching valve 75, and the drain pipe 78 to the drain path 66, and is drained to the outside from the drain path 66. . Therefore, the air staying in the boiling circuit 70 by the water forcedly fed into the boiling circuit 70 is discharged from the drainage channel 66 together with the water.

  Next, the reverse connection detection of the boiling circuit 70 between the tank unit 12 and the heat pump unit 13 is performed by the reverse connection detection function of the control unit 91 in the test operation after the water supply and air bleeding of the hot water supply device 11. Will be described.

  First, an example where the boiling circuit 70 is normally connected will be described with reference to FIGS.

  As indicated by black piping and arrows in FIG. 4, the switching valve 75 switches to the flow path connecting the heat pump unit 13 side and the upper return piping 76 to operate the heat pump unit 13 and the boiling circulation pump 83. Due to the operation of the boiling circulation pump 83, the water in the lower part of the hot water storage tank 17 is transferred to the piping 71a, 71c, 71b of the boiling forward passage 71, the boiling circulation pump 83 of the heat pump unit 13, and the boiling heat exchange. It flows to the upper part of the hot water storage tank 17 through the pipe 82b, 72c, 72a of the heater 82, the return path 72 for boiling, the switching valve 75, and the upper return pipe 76, and becomes a normal boiling flow in the boiling circuit 70. Water flowing in the boiling circuit 70 is boiled up by the heat pump unit 13.

  The temperature of the water taken out from the hot water storage tank 17 is detected by the feed water temperature detection sensor 84 on the inlet side of the heat exchanger 82 for boiling of the heat pump unit 13, and the boiling temperature detection sensor on the outlet side of the heat exchanger 82 for boiling is detected. At 85, the temperature of the water boiled up by the boiling heat exchanger 82 is detected.

  It is monitored that the detected temperature of the boiling temperature detection sensor 85 becomes equal to or higher than a predetermined boiling temperature (for example, 65 ° C.). If the temperature rises to a predetermined boiling temperature or higher, the heat pump unit 13 and the boiling circulation pump 83 are operated. To stop.

  Thereafter, as shown by the black pipe display and the arrow in FIG. 3, the switching valve 75 switches to the path connecting the heat pump unit 13 and the drainage path 66 for a predetermined time (for example, 1 to 10 minutes).

  As a result, the water supplied from the water supply path 20 by the water supply pressure from the water supply path 20 causes the hot water storage tank 17, the piping 71a, 71c, 71b of the boiling forward path 71, and the boiling circulation pump of the heat pump unit 13 to rise. 83, the heat exchanger 82 for boiling, the piping 72b, 72c, 72a of the boiling return path 72, the switching valve 75, and the drain pipe 78 to the drain path 66, and is drained to the outside from the drain path 66. .

  Due to this flow, the water that has been boiled above the predetermined boiling temperature remaining in the piping 72b, 72c, 72a, etc. in the boiling heat exchanger 82 or the return path 72 for boiling is on the drainage channel 66 side. Therefore, the temperature detected by the water supply temperature detection sensor 84 is the temperature of the water continuously taken out from the lower part of the hot water storage tank 17, and does not exceed the predetermined boiling temperature.

  In this way, if the detected temperature of the feed water temperature detection sensor 84 does not become equal to or higher than the predetermined boiling temperature, the piping 71c between the tank unit 12 and the heat pump unit 13 in the boiling forward path 71 of the boiling circuit 70 And the piping 72c of the return path 72 for boiling up can be determined to be normally connected.

  If it is determined that the connection is normal within a predetermined time, the process returns to the path of the boiling circuit 70 shown in FIG.

  An example in which the boiling circuit 70 is reversely connected will be described with reference to FIGS.

  As indicated by black piping and arrows in FIG. 2, the switching valve 75 switches to the flow path connecting the heat pump unit 13 side and the upper return piping 76 to operate the heat pump unit 13 and the boiling circulation pump 83. The operation of the boiling circulation pump 83 causes the water in the upper part of the hot water storage tank 17 to flow into the upper return pipe 76, the switching valve 75, the pipes 72a, 71c, 71b, the boiling circulation pump 83 of the heat pump unit 13, and the boiling heat. It flows to the lower part of the hot water storage tank 17 through the exchanger 82 and the pipes 72b, 72c, 71a, and is opposite to the normal boiling flow in the boiling circuit 70. Water that flows in reverse in the boiling circuit 70 is boiled by the heat pump unit 13.

  The temperature of the water taken out from the hot water storage tank 17 is detected by the feed water temperature detection sensor 84 on the inlet side of the heat exchanger 82 for boiling of the heat pump unit 13, and the boiling temperature detection sensor on the outlet side of the heat exchanger 82 for boiling is detected. At 85, the temperature of the water boiled up through the boiling heat exchanger 82 is detected.

  It is monitored that the detected temperature of the boiling temperature detection sensor 85 becomes equal to or higher than a predetermined boiling temperature (for example, 65 ° C.). If the temperature rises to a predetermined boiling temperature or higher, the heat pump unit 13 and the boiling circulation pump 83 are operated. To stop.

  Thereafter, as shown by the black pipe display and the arrow in FIG. 1, the switching valve 75 switches to the path connecting the heat pump unit 13 side and the drainage path 66 for a predetermined time (for example, 1 to 10 minutes).

  As a result, the water supplied from the water supply path 20 by the water supply pressure from the water supply path 20 causes the hot water storage tank 17, the pipes 71a, 72c, 72b, the heat exchanger 82 for boiling of the heat pump unit 13, and the circulation for boiling. It flows into the drainage path 66 through the pump 83, the respective pipes 71b, 71c, 72a, the switching valve 75, and the drainage pipe 78, and is drained from the drainage path 66 to the outside.

  As a result of this flow, hot water that has risen above the predetermined boiling temperature remaining in the boiling heat exchanger 82 and in the pipes 72b, 72c, 71a flows backward and flows toward the drainage channel 66. The detected temperature of the feed water temperature detection sensor 84 is the temperature of the water taken out from the upper part of the hot water storage tank 17 until now, and becomes the temperature of the hot water above the predetermined boiling temperature. Further, in the feed water temperature detection sensor 84, the hot water having a predetermined boiling temperature or higher is passed until hot water having a predetermined boiling temperature or higher remaining in the boiling heat exchanger 82 and each of the pipes 72b, 72c, 71a passes. Although hot water is detected, the temperature of the water fed from the hot water storage tank 17 is detected as the hot water passes. In addition, the boiling temperature detection sensor 85 detects hot water having a predetermined boiling temperature or higher until hot water having a predetermined boiling temperature or more remaining in each pipe 72b, 72c, 71a passes. The temperature of the water fed from the hot water storage tank 17 is detected as the hot water passes.

  As described above, when the temperature detected by the feed water temperature detection sensor 84 becomes equal to or higher than the predetermined boiling temperature within a predetermined time, the forward path for the boiling circuit 70 is raised between the tank unit 12 and the heat pump unit 13. It can be determined that the pipe 71c of 71 and the pipe 72c of the return path 72 for boiling are reversely connected. In order to judge more strictly, after the detected temperature of the feed water temperature detection sensor 84 becomes equal to or higher than the predetermined boiling temperature within a predetermined time, the detection temperature of the boiling temperature detection sensor 85 falls below the predetermined boiling temperature. (For example, -10 ° C or higher) If the detected temperature of the feed water temperature detection sensor 84 falls below a predetermined boiling temperature (for example, -10 ° C or higher), the piping of the boiling forward path 71 of the boiling circuit 70 It can be determined that 71c and the piping 72c of the return path 72 for boiling are reversely connected.

  If it is determined that the boiling circuit 70 is reversely connected, the fact is notified by a display or sound on the display unit of the hot water supply device 11.

  Therefore, according to the hot water supply device 11, even when the circulating pump 83 for boiling is on the heat pump unit 13 side, the tank unit 12 and the heat pump unit 13 are used by using the feed water temperature detection sensor 84 and the boiling temperature detection sensor 85. The reverse connection of the boiling circuit 70 can be detected. That is, after the heat pump unit 13 and the boiling circulation pump 83 are operated and the detected temperature of the boiling temperature detection sensor 85 is equal to or higher than the predetermined boiling temperature and the operation is stopped, the tank unit 12 side is stopped for a predetermined time. Only when the switching valve 75 switches to the path connecting the heat pump unit 13 side and the drainage path 66 and drains, the boiling circuit 70 is reversed if the detected temperature of the feed water temperature sensor 84 becomes equal to or higher than the predetermined boiling temperature. Since it determines with it being in a connection state, a reverse connection can be detected reliably in a shorter time than before.

  Moreover, when the reverse connection of the boiling circuit 70 between the tank unit 12 and the heat pump unit 13 is detected, the boiling temperature is detected after the detected temperature of the feed water temperature detection sensor 84 becomes equal to or higher than the predetermined boiling temperature. If the detection temperature of the feed water temperature detection sensor 84 falls below the predetermined boiling temperature after the detection temperature of the sensor 85 falls below the predetermined boiling temperature, the piping 71c of the boiling forward path 71 of the boiling circuit 70 Since it is determined that the pipe 72c of the return path 72 for boiling is reversely connected, the detection accuracy of the reverse connection can be improved.

  In addition, when the air venting control of the boiling circuit 70 is performed, the switching valve 75 is switched to the path connecting the heat pump unit 13 side and the drainage path 66. The detection path can be shared, and simplification and cost reduction can be achieved.

It is one Embodiment of this invention, and is a block diagram which shows the reverse connection detection operation in the reverse connection state of the hot water supply apparatus. It is a block diagram which shows the boiling operation in the reverse connection state of a hot-water supply apparatus same as the above. It is a block diagram which shows the reverse connection detection operation in the normal connection state of a hot-water supply apparatus same as the above. It is a block diagram which shows the boiling operation in the normal connection state of a hot-water supply apparatus same as the above.

Explanation of symbols

11 Water heater
12 Tank unit
13 Heat pump unit
17 Hot water storage tank
20 Water supply route
66 Drainage route
70 Boiling circuit
71 Boiling route
72 Return path for boiling
75 Switching valve as switching means
82 Heat exchanger for boiling
83 Circulation pump for boiling
84 Water supply temperature detection sensor as water supply temperature detection means
85 Boiling temperature detection sensor as boiling temperature detection means
91 Control unit

Claims (3)

A tank unit having a hot water storage tank;
A heat pump unit having a heat exchanger for boiling;
A water supply path for supplying water to the lower part of the hot water storage tank;
A boiling forward path connecting the hot water storage tank and the inlet side of the boiling heat exchanger, a boiling return path connecting the hot water tank and the outlet side of the boiling heat exchanger, the heat pump A circulating pump for boiling which is provided on the unit side and circulates hot water in the direction from the forward path for boiling to the return path for boiling via the heat exchanger for boiling on the heat pump unit side, the heat pump unit side A heating circuit having a feed water temperature detecting means provided in the boiling forward path, and a boiling temperature detecting means provided in the return path for boiling on the heat pump unit side;
Switching means capable of switching the connection of the return path for boiling on the tank unit side between the hot water storage tank side and the drainage path side for draining to the outside;
When detecting reverse connection of the boiling circuit between the tank unit and the heat pump unit, the heat pump unit and the circulating pump for boiling are operated, and the detected temperature of the boiling temperature detecting means is a predetermined temperature. After stopping the operation when the temperature rises above the boiling temperature, the switching means switches to the drainage path side for a predetermined time and drains, during which the detected temperature of the feed water temperature detection means exceeds the predetermined boiling temperature. And a controller that determines that the boiling circuit is in a reverse connection state. When detecting the reverse connection of the boiling circuit between the tank unit and the heat pump unit, the control unit detects the boiling temperature detecting means after the detected temperature of the feed water temperature detecting means becomes equal to or higher than a predetermined boiling temperature. If the detected temperature of the feed water temperature detecting means falls below a predetermined boiling temperature after the detected temperature falls below a predetermined boiling temperature, it is determined that the boiling circuit is in a reverse connection state. The hot water supply apparatus according to claim 1. The hot water supply apparatus according to claim 1 or 2, wherein the control unit switches the switching means to the drainage path side also in the air venting control of the boiling circuit.

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