JP2018063090A - Heat pump water heater with cooling/heating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely secure cooling capacity of indoor air and heating capacity of hot water/water.SOLUTION: In a boiling-up/cooling operation, a two-way valve 121 is switched to an opened state, a two-way valve 122 is switched to a closed state, a two-way valve 123 is switched to the closed state, and a two-way valve 124 is switched to the opened state. Further an expansion valve 112 is ▵H controlled, and an expansion valve 113 is controlled to a full-opened state. A refrigerant gas discharged from a compressor 14 radiates heat and condenses in a water-refrigerant heat exchanger 15 to heat water to a hot water storage tank 2, then evaporates in an indoor heat exchanger 27, absorbs heat from indoor air, further evaporates in an outdoor heat exchanger 17 to absorb heat also from the outside air, and returns to the compressor 14. By increasing a heat absorption amount in the outdoor heat exchanger 17 by a proper method, a reduced heat absorption amount is compensated even when cooling load is reduced with lapse of time after start of an operation and the heat absorption amount in the indoor heat exchanger 27 is reduced, and heating capacity of hot water/water in the water-refrigerant heat exchanger 15 can be surely kept.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a heat pump water heater with an air-conditioning function capable of performing boiling and cooling operations in which indoor air cooling and hot water in a hot water storage tank are heated in parallel.

  Conventionally, in this type of water heater, as disclosed in Patent Document 1, the discharge side of the compressor is connected to the inlet side of a heat pump heat exchanger (outdoor heat exchanger) as a condenser, and the heat pump heat exchanger The outlet side is connected to the inlet side of the water refrigerant heat exchanger as a condenser, the outlet side of the water refrigerant heat exchanger is connected to the indoor heat exchanger as an evaporator, and the outlet side of the indoor heat exchanger is a compressor There was something connected to the inhalation side.

Japanese Patent No. 5242746

  In the above-described conventional technology, while achieving both the cooling operation in which only the cooling of the indoor air is performed alone and the boiling and cooling operation in which the cooling of the indoor air and the heating of the hot water in the hot water storage tank are performed in parallel, From the viewpoint of ensuring the cooling capacity of the indoor air and the heating capacity of the hot water, there is a problem that it cannot be said to be sufficient.

  In order to solve the above-described problems, in claim 1 of the present invention, a heat pump heat exchanger capable of selectively functioning as a condenser or an evaporator that performs heat exchange between refrigerant and outside air, and the heat pump heat exchanger are provided. A compressor to be connected, a hot water storage tank for storing hot water, a water refrigerant heat exchanger as a condenser for performing heat exchange between the refrigerant and water, and a condensation for performing heat exchange between the refrigerant and room air An indoor heat exchanger that can selectively function as a water heater or an evaporator, and a hot water circulation circuit is formed by annularly connecting the water side of the water refrigerant heat exchanger and the hot water storage tank with hot water piping, The heat pump heat exchanger, the compressor, the refrigerant side of the water-refrigerant heat exchanger, and the heat pump water heater with an air conditioning function that connects the indoor heat exchanger with a refrigerant pipe to form a refrigerant circulation circuit. As said heat pump A first connection means that can selectively connect the discharge side of the compressor to the exchanger or the water-refrigerant heat exchanger, and a first connection means connected to the inlet side of the indoor heat exchanger as an evaporator A second decompressor connected to an outlet side of the heat pump heat exchanger as the condenser, or a second connection means capable of selectively connecting the water refrigerant heat exchanger to the one decompressor; The outlet side of the indoor heat exchanger as the evaporator is connected to the suction side of the compressor via the heat pump heat exchanger as the second decompressor and the evaporator, or the evaporator as the evaporator. It has a 3rd connection means which can be connected selectively without going through a heat pump heat exchanger and the 2nd decompressor.

  Further, in claim 2, during the cooling operation, the discharge side of the compressor, the heat pump heat exchanger as the condenser, the second decompressor, the first decompressor, and the room as the evaporator The first connection means, the second connection means, and the third connection means are switched so that the refrigerant flows through a path on the suction side of the heat exchanger and the compressor, and at the time of boiling / cooling operation Are the discharge side of the compressor, the water refrigerant heat exchanger, the first decompressor, the indoor heat exchanger as the evaporator, the second decompressor, the heat pump heat exchanger as the evaporator, It has a switching means for switching the first connection means, the second connection means, and the third connection means so that the refrigerant flows through a path on the suction side of the compressor.

  Further, in claim 3, the first connecting means includes a four-way valve that selectively communicates the discharge side of the compressor to the inlet side of the water-refrigerant heat exchanger or to the heat pump heat exchanger. A first on-off valve capable of opening and closing a pipe line between the inlet side of the water-refrigerant heat exchanger and the four-way valve, and the second connecting means includes the second decompressor and the first A second on-off valve capable of opening and closing a pipe line to the decompressor; and a third on-off valve capable of opening and closing a pipe line between the outlet side of the water refrigerant heat exchanger and the first decompressor. The third connecting means includes a fourth on-off valve capable of opening and closing a pipe line between the anti-first pressure reducer side of the indoor heat exchanger and the compressor, and an anti-second of the indoor heat exchanger. A fifth open / close valve capable of opening and closing a pipe line between the first pressure reducer side and the second pressure reducer;

  According to a fourth aspect of the present invention, the four-way valve and the second pressure reducer are provided in an outdoor unit containing the heat pump heat exchanger and the compressor, and the first to fifth on-off valves are the hot water storage It is provided in a hot water storage unit containing the tank and the water refrigerant heat exchanger, and the first pressure reducer is provided in the hot water storage unit or an indoor unit containing the indoor heat exchanger. .

  Moreover, in Claim 5, it further has an outdoor fan for passing outside air through the heat pump heat exchanger, and an indoor fan for passing room air through the indoor heat exchanger, and during the cooling operation, The outdoor fan is rotationally driven to make the heat pump heat exchanger function as a condenser, and the indoor fan is rotationally driven to make the indoor heat exchanger function as an evaporator. The outdoor fan is rotationally driven in order to cause the heat pump heat exchanger to function as an evaporator, and the indoor fan is rotationally driven in order to cause the indoor heat exchanger to function as an evaporator. At the time of boiling-up / cooling operation, the valve opening of the second pressure reducer is fixed at the fully open state, and the valve opening of the first pressure reducer is operated. It is intended to be variably controlled in accordance with the state.

  Further, in claim 6, the switching means, during boiling operation, the discharge side of the compressor, the water refrigerant heat exchanger, the second decompressor, the heat pump heat exchanger as the evaporator, The first connecting means, the second connecting means, and the third connecting means are switched so that the refrigerant flows through a path on the suction side of the compressor.

  Further, in claim 7, during the boiling operation, the third on-off valve is opened, and the valve opening of the second pressure reducer is variably controlled according to the operating state. .

  In the eighth aspect of the present invention, the switching means includes a discharge side of the compressor, the indoor heat exchanger as the condenser, the first decompressor, the second decompressor, and the evaporation during heating operation. The first connection means, the second connection means, and the third connection means are switched so that the refrigerant flows through a path on the suction side of the compressor, the heat pump heat exchanger as a compressor, and -During heating operation, after the shunt from the discharge side of the compressor to the indoor heat exchanger as the condenser and the water refrigerant heat exchanger, the first downstream of the indoor heat exchanger The refrigerant flows through a path leading to the suction side of the compressor via the second pressure reducer and the heat pump heat exchanger as the evaporator after joining from the pressure reducer and the water refrigerant heat exchanger. 1st connection means, said 2nd connection It means, and is intended for switching the third connecting means.

  Further, in claim 9, during the heating operation and during the boiling / heating operation, the valve opening degree of the first pressure reducer is fixed at the fully open state, and the valve opening degree of the second pressure reducer is in the operating state. It is variably controlled according to the above.

  Further, in the present invention, the refrigerant circulation circuit includes a first communication pipe that communicates the first on-off valve, the fourth on-off valve, and the four-way valve, the second on-off valve, and the fifth on-off valve. A second communication conduit that communicates with the second decompressor, a third communication conduit that communicates between the first decompressor and the first decompressor side of the indoor heat exchanger, and the fourth open / close A fourth communication conduit that communicates the valve and the fifth on-off valve with the side opposite to the first pressure reducer of the indoor heat exchanger, and the hot water storage unit and the outdoor unit are connected to the first communication passage. The hot water storage unit and the indoor unit are connected by the third communication pipe and the fourth communication pipe. The hot water storage unit and the indoor unit are connected by a pipe and the second communication pipe.

  According to the first aspect of the present invention, the heat pump heat exchanger, the water refrigerant heat exchanger, the indoor heat exchanger, the compressor, the first decompressor, the second decompressor, etc. can be selectively connected appropriately. -3rd connection means is provided.

  According to these first to third connecting means, for example, the first connecting means connects the discharge side of the compressor to the heat pump heat exchanger as a condenser, and the second connecting means further includes the heat pump heat exchanger. Can be connected to the indoor heat exchanger as an evaporator via the second decompressor and the first decompressor, and further, the third connecting means can connect the indoor heat exchanger to the suction side of the compressor. . In this case, the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the outside air by the heat pump heat exchanger and condenses into a liquid refrigerant, and then evaporates in the indoor heat exchanger to absorb heat from the indoor air to the compressor. The cooling operation is realized.

  Further, for example, the first connection means connects the discharge side of the compressor to the water refrigerant heat exchanger, and the second connection means connects the water refrigerant heat exchanger as an evaporator via the first pressure reducer. The indoor heat exchanger may be connected, and the third connecting means may connect the indoor heat exchanger to the suction side of the compressor via the second pressure reducer and the heat pump heat exchanger as an evaporator. it can. In this case, the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the hot water piping that leads to the hot water storage tank in the water refrigerant heat exchanger, condenses into a liquid refrigerant, and then evaporates in the indoor heat exchanger. After absorbing heat from the air, it is further evaporated by a heat pump heat exchanger to absorb heat from the outside air and return to the compressor. Thus, boiling / cooling operation is realized in which indoor air is cooled and hot water in the hot water storage tank is heated.

  In the boiling / cooling operation, as described above, the heat absorption in the indoor heat exchanger (functioning as an evaporator) and the heat absorption in the heat pump heat exchanger (functioning as an evaporator) are totaled. What has been used is used for heating hot water in the water refrigerant heat exchanger (functioning as a condenser). Therefore, for example, even when the cooling load is reduced with the passage of time after the start of operation and the endothermic amount in the indoor heat exchanger is reduced, the endothermic amount in the heat pump heat exchanger is increased by an appropriate method. The reduced amount can be compensated for, and thereby the hot water heating capacity in the water-refrigerant heat exchanger can be reliably maintained (without lowering).

  As described above, according to the first aspect of the present invention, by switching the connection by the first to third connection means, in the cooling operation (by using the heat pump heat exchanger as a condenser), the normal indoor air cooling capacity In addition, in heating and cooling operations (using a heat pump heat exchanger as an evaporator), the heating capacity of hot water in the hot water storage tank can be reliably ensured.

  Further, according to the second aspect, by switching the first to third connection means by the switching means, the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the outside air and condenses during the cooling operation. Thus, a refrigerant path is realized in which the liquid refrigerant is converted into liquid refrigerant, and then evaporated by the indoor heat exchanger to absorb heat from the indoor air and return to the compressor. Also, during boiling and cooling operations, the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the hot water piping that leads to the hot water storage tank in the water refrigerant heat exchanger, condenses into a liquid refrigerant, and then evaporates in the indoor heat exchanger Thus, a refrigerant path is realized in which heat is absorbed from room air and then evaporated by a heat pump heat exchanger to absorb heat from outside air and return to the compressor.

  According to claim 3, the function of the first connection means for selectively connecting the discharge side of the compressor to the heat pump heat exchanger or the water refrigerant heat exchanger as the condenser, the indoor heat as the evaporator Function of second connection means for selectively connecting second decompressor or water / refrigerant heat exchanger on outlet side of heat pump heat exchanger as condenser to first decompressor connected to inlet side of exchanger The third is to selectively connect the outlet side of the indoor heat exchanger as the evaporator to the suction side of the compressor via the second decompressor and the heat pump heat exchanger as the evaporator or not. The function of the connecting means can be realized as a specific configuration combining various valves.

  According to claim 4, all or most of the first to fifth on-off valves and the first pressure reducer, which are actuators necessary for executing the change of the refrigerant path accompanying the above-described operation switching ( The first to fifth on-off valves) are centrally arranged in a hot water storage unit having a large structure and a large arrangement space because the hot water storage tank is included. As a result, space can be saved as compared with the case where some of them are arranged in an outdoor unit or an indoor unit. Further, by collecting the actuators in the hot water storage unit as described above, the outdoor unit and the indoor unit can be diverted from those normally used for air conditioners. As a result, the product configuration can be shared, and the cost can be reduced.

  According to claim 5, first, in the cooling operation, of the second decompressor and the first decompressor existing in the path from the heat pump heat exchanger to the indoor heat exchanger as the evaporator, The valve opening of the second pressure reducer in the outdoor unit is fully opened, and the valve opening of the first pressure reducer in the downstream hot water storage unit or indoor unit is variably controlled.

  Here, if the expansion operation of the refrigerant is controlled by variably controlling the valve opening degree of the second pressure reducer in the outdoor unit, the refrigerant that has become low temperature and low pressure in the second pressure reducer exits the outdoor unit and enters the hot water storage unit or the indoor unit. Will be introduced. In this case, when the refrigerant pipe passes through the connection portion exposed to the outside from the indoor unit or the hot water storage unit, the cold air of the refrigerant is discharged, resulting in a loss of heat. In addition, passing through a relatively high temperature hot water storage unit at a low temperature and low pressure for a long distance causes heat loss due to the same cool air discharge, and a large pressure loss (because of the low pressure) causes the refrigerant density in the compressor to increase. The cooling operation efficiency is lowered.

  According to the fifth aspect, the second decompressor in the outdoor unit is fixed fully open, and the valve opening degree of the first decompressor in the hot water storage unit (or indoor unit) is variably controlled to control the refrigerant expansion operation. Thereby, unlike the above, since the refrigerant leaves the outdoor unit in a high temperature and high pressure state and is introduced into the hot water storage unit or the indoor unit, the adverse effect of the heat loss is avoided. Furthermore, since heat can be radiated from the refrigerant pipe to the outside air at the connection portion exposed to the outside, the heat radiating section can be enlarged, and the cooling operation efficiency is improved. Furthermore, since the amount of hot water supply is usually small in summer, a relatively large amount of unheated water is stored in the hot water storage tank, and the temperature in the hot water storage unit is often lower than the outside air temperature. As a result, heat can be radiated into the hot water storage unit not only at the connection portion of the refrigerant pipe but also at a portion upstream of the first pressure reducer, and the heat radiation section can be expanded to improve the cooling operation efficiency.

  Further, the low temperature and low pressure are limited to the downstream side of the first pressure reducer, and the adverse effect due to the increase in pressure loss can be avoided by shortening the passage distance in the low temperature and low pressure state. Also by this, the cooling operation efficiency can be improved.

  Further, according to the fifth aspect, similarly to the above, the valve opening degree of the second pressure reducer is fully opened even during the boiling / cooling operation, and the valve opening degree of the first pressure reducer in the hot water storage unit or the indoor unit is Variable control. In this case, after heat exchange with the water refrigerant heat exchanger in the refrigerant path of water refrigerant heat exchanger → first pressure reducer → indoor heat exchanger as condenser → second pressure reducer → heat pump heat exchanger as evaporator The refrigerant can be reliably expanded to a low temperature and low pressure state in the first decompressor and supplied to the indoor heat exchanger. Thereby, the highly efficient driving | operation using the heating (exhaust heat) to the hot water in a hot water storage tank can be performed.

  In addition, since such highly efficient boiling / cooling operation can be performed, for example, heated water generated in a boiling operation (increase of heated water in a hot water storage tank due to heating of unheated water) usually performed at night, for example. The amount can be reduced. As a result, the amount of unheated water in the hot water storage tank becomes relatively large and the temperature in the hot water storage unit tends to further decrease. Therefore, in the above-described upstream portion of the first pressure reducer during the cooling operation, The heat dissipation effect is further enhanced.

  According to the sixth aspect of the present invention, during the boiling operation, the high-temperature and high-pressure refrigerant gas discharged from the compressor is transferred to the hot water storage tank in the water refrigerant heat exchanger by switching the first to third connection means by the switching means. A refrigerant path is realized in which heat is dissipated and condensed into a hot and cold water pipe leading to a liquid refrigerant and then evaporated by a heat pump heat exchanger to absorb heat from the outside air and return to the compressor.

  According to claim 7, during the boiling operation, the third on-off valve in the hot water storage unit is opened, and the valve opening of the second pressure reducer in the outdoor unit is variably controlled. In this case, in the refrigerant path of the water refrigerant heat exchanger → the third on-off valve → the second decompressor → the heat pump heat exchanger as the evaporator (for example, an expansion valve is used as the third on-off valve to control the expansion operation of the refrigerant). By controlling the expansion operation of the refrigerant with the second decompressor, the distance to the heat pump heat exchanger that passes in a low-temperature and low-pressure state can be shortened. As a result, it is possible to avoid the adverse effects caused by the increase in pressure loss as described above, and to improve the boiling operation efficiency.

  According to the eighth aspect of the present invention, the high-temperature and high-pressure refrigerant gas discharged from the compressor radiates heat to the indoor air in the indoor heat exchanger and is condensed during the heating operation by switching the first to third connecting means by the switching means. Thus, a refrigerant path is realized in which the liquid refrigerant is obtained and then evaporated by the heat pump heat exchanger to absorb heat from the outside air and return to the compressor. Also, during boiling and heating operations, part of the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the indoor air in the indoor heat exchanger and condenses into liquid refrigerant, and the rest in the water refrigerant heat exchanger A refrigerant path is realized in which heat is dissipated and condensed into hot water piping to the hot water storage tank to become liquid refrigerant, and then the liquid refrigerant joins and evaporates in the heat pump heat exchanger to absorb heat from the outside air and return to the compressor. .

  According to the ninth aspect, first, during the heating operation, the first pressure reducer in the hot water storage unit is opened, and the valve opening degree of the second pressure reducer in the outdoor unit is variably controlled. In this case, the expansion operation of the refrigerant is controlled by the second decompressor instead of the first decompressor in the refrigerant path of the indoor heat exchanger → the first decompressor → the second decompressor → the heat pump heat exchanger as the evaporator. Thus, the distance to the heat pump heat exchanger that passes in a state of low temperature and low pressure can be shortened.

  Also, during the boiling / heating operation, the first pressure reducer in the hot water storage unit is opened, and the valve opening of the second pressure reducer in the outdoor unit is variably controlled. In this case, from the discharge side of the compressor, through the indoor heat exchanger and the first pressure reducer, or the water refrigerant heat exchanger, in the refrigerant path of the second pressure reducer → the heat pump heat exchanger as the evaporator, the heat pump heat By controlling the expansion operation of the refrigerant with the second decompressor closer to the exchanger, the distance to the heat pump heat exchanger that passes in a low-temperature and low-pressure state can be shortened as described above.

  As a result, in any case of the heating operation and the boiling / heating operation, it is possible to avoid the adverse effects due to the increase in pressure loss as described above, and to improve the operation efficiency. Further, since the refrigerant passes through the hot water storage unit in a high temperature and high pressure state, it is possible to prevent freezing around the hot water storage tank in winter.

  According to the tenth aspect, the hot water storage unit is connected to the outdoor unit by two communication pipelines (a first communication pipeline and a second communication pipeline), and another two are connected to the indoor unit. It is the structure connected by a communication line (a 3rd communication line and a 4th communication line). As a result, in the hot water storage unit having a relatively large structure and sufficient space, the number of required connection ports for the communication pipeline is four, while the outdoor unit and the indoor unit are relatively small and have no space. In, the number of required connection ports for the communication pipeline can be limited to two.

1 is an external configuration diagram of a main unit of a heat pump water heater with an air conditioning function according to an embodiment of the present invention. Circuit diagram of the entire heat pump water heater Functional configuration diagram of heat-pump control unit Functional configuration diagram of hot water storage control unit Functional configuration diagram of air conditioner control unit Diagram explaining operation during boiling operation The figure explaining the action at the time of heating operation Diagram explaining operation during boiling and heating operation The figure explaining the action at the time of cooling operation Diagram explaining operation during boiling / cooling operation A diagram that summarizes the opening and closing behavior of two-way valves, expansion valves, and four-way valves

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

  FIG. 1 shows an external configuration of a main unit of the heat pump water heater 1 with an air conditioning function of the present embodiment. In FIG. 1, a heat pump water heater 1 of this embodiment includes a hot water storage unit 100 provided with a hot water storage tank 2 (see FIG. 2 and the like described later), a heat pump unit 300 as an outdoor unit, and an air conditioner unit 200 as an indoor unit. have.

  FIG. 2 shows a circuit configuration of the entire heat pump water heater 1 of the present embodiment. As shown in FIG. 2, the hot water storage unit 100 includes a refrigerant-side flow path 15 b and a water-side flow path 15 a for circulating the refrigerant, and exchanges heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 2. A water refrigerant heat exchanger 15 that functions as a condenser that performs heating, and a boiling pump 19. That is, the water-side flow path 15a of the water-refrigerant heat exchanger 15 and the hot water storage tank 2 are annularly connected by a heating forward pipe 5 and a heating return pipe 6 serving as hot water piping, and hot water is stored in the hot water storage unit 100. A heating circulation circuit 4 as a circulation circuit is formed.

  The heating forward pipe 5 is connected to the lower part of the hot water storage tank 2, and the heating return pipe 6 is connected to the upper part of the hot water storage tank 2. The boiling pump 19 is provided in the middle of the heating forward pipe 5, and the hot water from the heating forward pipe 5 is circulated to the heating return pipe 6 through the water-side flow path 15a while Circulate hot water. The heating forward pipe 5 is provided with an incoming water temperature sensor 23 for detecting an incoming water temperature T1 (hot water inlet temperature) flowing into the water-side flow path 15a of the water-refrigerant heat exchanger 15. The return pipe 6 is provided with a boiling temperature sensor 24 for detecting a boiling temperature Tb flowing out from the water-side flow path 15a toward the hot water storage tank 2.

  A plurality of hot water storage temperature sensors 12 for detecting the temperature of hot water in the hot water storage tank 2 (hot water storage temperature) and detecting the heating status of the hot water (in other words, the status of hot water storage) are provided on the side surface of the hot water storage tank 2. ing. A water supply pipe 7 for supplying water to the hot water storage tank 2 is connected to the lower part of the hot water storage tank 2, and a hot water discharge pipe 8 for discharging hot water stored therein is also connected to the upper part of the hot water storage tank 2. A water supply bypass pipe 9 is branched from the water supply pipe 7. Furthermore, a mixing valve 10 that mixes the hot water from the tap water pipe 8 and the water from the water supply bypass pipe 9 into hot water at a hot water supply set temperature, and a hot water temperature sensor 11 that detects the hot water temperature after mixing by the mixing valve 10; , Is provided.

  On the other hand, the refrigerant circulation circuit 30 capable of heating hot water in the hot water storage tank 2 by heat exchange (details will be described later) in the water refrigerant heat exchanger 15 includes the heat pump unit 300, the hot water storage unit 100, and the air conditioner unit 200. It is provided over. The refrigerant circuit 30 includes a heat pump circuit unit 30A disposed in the heat pump unit 300, a hot water storage circuit unit 30B disposed in the hot water storage unit 100, and an air conditioner circuit unit 30C disposed in the air conditioner unit 200. Including.

  The heat-pump circuit unit 30A includes a refrigerant pipe 18 serving as a flow path for the refrigerant, and a condenser or an evaporator by heat exchange between the compressor 14 that compresses the refrigerant, a four-way valve 31, and the refrigerant and outside air. And an outdoor heat exchanger 17 as a heat pump heat exchanger that selectively functions (details will be described later) are connected by the refrigerant pipe 18. The outdoor heat exchanger 17 is provided with an outdoor fan 67 for passing outside air through the outdoor heat exchanger 17.

  Specifically, the refrigerant pipe 18 is connected to the pipe section 18a via the pipe section 18a on the discharge side of the compressor 14 and the four-way valve 31 during the boiling operation (see FIG. 6 described later). And a piping part 18b. The pipe portion 18 b communicates with a communication conduit 101 as a first communication conduit connecting the heat pump unit 300 and the hot water storage unit 100 at a connection port 68 a serving as an outlet to the outside of the heat pump unit 300.

  The refrigerant pipe 18 is connected to the pipe portion 18c on the suction side of the compressor 14 and the compressor 14 side (in other words, the boiling point) of the outdoor heat exchanger 17 during a boiling operation (see FIG. 6 described later). The outlet side during the upper operation, etc. The same applies hereinafter (see FIG. 6 and the like to be described later) and the piping part 18d for connecting to the piping part 18c via the four-way valve 31, and the anti-compressor 14 side of the outdoor heat exchanger 17 ( In other words, it includes a piping portion 18e connected to the inlet side during the above-mentioned boiling operation, etc., and so on (see FIG. 6 and the like described later). The pipe portion 18e includes an expansion valve 113 as a second pressure reducer, and a second communication pipe that connects the heat pump unit 300 and the hot water storage unit 100 at a connection port 68b different from the connection port 68a. It communicates with a communication conduit 102 as a path.

  The four-way valve 31 is a valve having four ports, and the remaining pipe portions are respectively connected to the two ports for the pipe portions 18b and 18d (which constitute the refrigerant main path) in the refrigerant pipe 18. Which of the two ports for 18a and 18c is connected is switched. The two ports for the pipe portions 18a and 18c are connected to each other by a refrigerant sub route including the pipe portions 18a and 18c arranged in a loop shape, and the compressor 14 is provided on the refrigerant sub route. ing. For example, when the four-way valve 31 is switched to the state shown in FIG. 6 described later (hereinafter referred to as “switching to the heating side” or the like as appropriate), the pipe portion 18a on the discharge side of the compressor 14 is connected to the water. When connected to the pipe section 18b on the inlet side of the refrigerant heat exchanger 15 and switched to the state shown in FIG. 9 described later (hereinafter referred to as “switching to the cooling side” as appropriate), the pipe section 18a. Is communicated with the pipe portion 18d on the outdoor heat exchanger 17 side.

  The compressor 14, the four-way valve 31, the outdoor heat exchanger 17, the outdoor fan 67, the expansion valve 113, and the like are included in the housing of the heat pump unit 300 (see FIG. 1).

  The hot water storage circuit section 30 </ b> B includes a refrigerant pipe 25 that serves as the refrigerant flow path, and the refrigerant-side flow path 15 b of the water-refrigerant heat exchanger 15 is connected to the refrigerant pipe 25.

  Specifically, the refrigerant pipe 25 is connected to a pipe part 25a communicating with the communication pipe line 101 at a connection port 75a serving as an outlet to the outside of the hot water storage unit 100, and branched from the pipe part 25a. A pipe section 25b whose pipe section 25a side is connected to the inlet side of the water refrigerant heat exchanger 15 (specifically, the refrigerant-side flow path 15b), and the water refrigerant heat exchanger 15 (specifically, the refrigerant-side heat exchanger 15 And a piping part 25c connected to the outlet side of the flow path 15b). The pipe part 25b includes a two-way valve 121 as a first on-off valve capable of opening and closing the pipe part 25b on the inlet side of the four-way valve 31 and the water-refrigerant heat exchanger 15, and the pipe part 25c includes an expansion valve 111 having a fully-closed function as a third on-off valve.

  The refrigerant pipe 25 includes a pipe part 25d branched from the pipe part 25a and connected in the same manner as the pipe part 25b. The non-pipe section 25a side of the pipe section 25d is connected to a communication pipe 104 as a fourth communication pipe connecting the hot water storage unit 100 and the air conditioner unit 200 at a connection port 95a serving as an outlet to the outside of the hot water storage unit 100. Communicating with

  Further, the refrigerant pipe 25 is branched and connected from the anti-water refrigerant heat exchanger 15 side of the pipe part 25c, and the anti-pipe part 25c side is connected to the communication pipe at a connection port 75b different from the connection port 75a. A piping portion 25e communicating with the passage 102, a piping portion 25f communicating the piping portion 25d and the piping portion 25e, and the piping portion 25c branch off from the anti-water refrigerant heat exchanger 15 side in the same manner as the piping portion 25e. And a pipe portion 25g communicating with a communication line 103 as a third communication line connecting the hot water storage unit 100 and the air conditioner unit 200 at a connection port 95b serving as an outlet to the outside of the hot water storage unit 100. Including. The pipe part 25d includes a two-way valve 122 as a fourth on-off valve capable of opening and closing the pipe part 25d between a connection point with the pipe part 25a and a connection point with the pipe part 25f. The part 25e includes a two-way valve 123 as a second on-off valve capable of opening and closing the pipe part 25e between a connection point with the pipe part 25g and a connection point with the pipe part 25f, and the pipe part 25f Is provided with a two-way valve 124 as a fifth on-off valve capable of opening and closing the pipe part 25f, and the pipe part 25g is provided with an expansion valve 112 with a fully-closed function as a first pressure reducer. As a result, the two-way valve 123 has a function of opening and closing a pipe line between the expansion valve 113 and the expansion valve 112, and the expansion valve 111 is connected to the outlet side of the water refrigerant heat exchanger 15 and the A function of opening and closing a pipe line between the expansion valve 112 and the expansion valve 112 is provided. The communication conduit 101 has a function of communicating the two-way valves 121 and 122 and the four-way valve 31, and the communication conduit 102 connects the two-way valves 123 and 124 and the expansion valve 113. It has a function to communicate. In other words, the hot water storage unit 100 and the heat pump unit 300 are connected by the communication pipes 101 and 102 (see also FIG. 1).

  The two-way valves 121, 122, 123, 124, the expansion valves 111, 112, the water / refrigerant heat exchanger 15, the hot water storage tank 2, and the like are included in the casing of the hot water storage unit 100 (FIG. 1). reference). The expansion valve 112 may be provided in a piping part 26b described later (that is, in the casing of the air conditioner unit 200).

  The air conditioner circuit section 30C includes a refrigerant pipe 26 that serves as a flow path for the refrigerant, and indoor heat that selectively functions as a condenser or an evaporator (details will be described later) by heat exchange between the refrigerant and room air. An exchanger 27 is connected to the refrigerant pipe 26. The indoor heat exchanger 27 is provided with an indoor fan 77 for passing room air through the indoor heat exchanger 27.

  Specifically, the refrigerant pipe 26 communicates with the communication pipe 104 at a connection port 76 a serving as an outlet to the outside of the air conditioner unit 200, and the anti-communication pipe 104 side is the connection port 76 a of the indoor heat exchanger 27. The pipe portion 26a connected to the side (in other words, the inlet side during heating operation, the same applies hereinafter, see FIG. 7 and the like) and the communication pipe 103 communicate with the connection port 76b different from the connection port 76a. In addition, the anti-communicating pipe line 103 side is connected to the connecting port 76b side of the indoor heat exchanger 27 (in other words, the outlet side during heating operation, the same applies hereinafter; see FIG. 7 and the like described later) Is included. As a result, the two-way valve 122 has a function of opening and closing a pipe line between the pipe portion 26a on the side of the anti-expansion valve 112 of the indoor heat exchanger 27 and the compressor 14, and the two-way valve 124. Is provided with a function of opening and closing a pipe line between the piping part 26 a on the side of the anti-expansion valve 112 of the indoor heat exchanger 27 and the expansion valve 113. The communication line 103 has a function of communicating the expansion valve 112 with the expansion valve 112 side of the indoor heat exchanger 27, and the communication line 104 includes the two-way valves 122 and 124 and the The indoor heat exchanger 27 has a function of communicating with the anti-expansion valve 112 side. In other words, the hot water storage unit 100 and the air conditioner unit 200 are connected by the communication conduits 103 and 104 (see also FIG. 1).

  The indoor heat exchanger 27, the indoor fan 77, and the like are included in the casing of the air conditioner unit 200 (see FIG. 1).

  In the refrigerant circuit 30, for example, R32 refrigerant is used as a refrigerant to constitute a heat pump cycle. The refrigerant may be an HFC refrigerant, an HFO refrigerant, or a carbon dioxide refrigerant. And in the refrigerant | coolant piping 18 of the said heat-pon circuit part 30A, the discharge temperature sensor 20 which detects the refrigerant | coolant discharge temperature Tout discharged from the compressor 14 is provided in the said piping part 18a, The said piping part 18c has A suction temperature sensor 32 that detects the refrigerant suction temperature Tin of the refrigerant sucked into the compressor 14 is provided. An outdoor air temperature sensor 22 for detecting the outdoor air temperature Tair is provided on the air inlet side of the outdoor heat exchanger 17, and the heat exchanger heat exchange temperature Tex (acts as an evaporator) in the outdoor heat exchanger 17. A heat exchange temperature sensor 35 is provided for detecting the temperature of the evaporative refrigerant during The detection results of these sensors 20, 32, 22, and 35 are input to a heat pump control unit 410 provided in the heat pump unit 300 and further provided in the hot water storage control unit 420 and the air conditioner unit 200 provided in the hot water storage unit 100 as appropriate. It is also input to the air conditioner control unit 430 (which may be received via the heat pump control unit 410 or may be received directly from the sensors 20, 32, 22).

  In addition, in the refrigerant pipe 25 of the hot water storage circuit section 30B, the pipe section 25c is provided with an outflow temperature sensor 21 that detects the refrigerant outflow temperature T2 that flows out from the refrigerant-side flow path 15b and travels toward the expansion valve 111. It has been. The water refrigerant heat exchanger 15 is provided with a condensing temperature sensor 33 that detects a refrigerant condensing temperature when the refrigerant condenses in the flow path 15b on the refrigerant side. The detection results of these sensors 21 and 33 are input to a hot water storage control unit 420 provided in the hot water storage unit 100, and further, the heat pump control unit 410 provided in the heat pump unit 300 and the air conditioner unit 200 as appropriate. It is also input to the air conditioner control unit 430 (may be received via the hot water storage control unit 420 or may be received directly from the sensors 21 and 33).

  Further, with respect to the refrigerant pipe 26 of the air conditioner circuit section 30C, the indoor heat exchanger 27 is provided with an indoor temperature sensor 34 for detecting the indoor temperature Tr of the air-conditioning target space. The detection result of the sensor 34 is input to an air conditioner control unit 430 provided in the air conditioner unit 200, and further, the heat pump control unit 410 provided in the heat pump unit 300 and the hot water storage control unit provided in the hot water storage unit 100 as appropriate. It is also input to 420 (may be received via the air conditioner control unit 430 or directly from the sensor 34).

  The hot water storage control unit 420 of the hot water storage unit 100, the heat pump control unit 410 of the heat pump unit 300, and the air conditioner control unit 430 of the air conditioner unit 200 are connected to be communicable with each other. Based on the detection result, the operation of each device / actuator in the hot water storage unit 100, the heat pump unit 300, and the air conditioner unit 200 is controlled in cooperation with each other. In particular, the hot water in the hot water storage tank 2 is heated by controlling the opening / closing operation and the opening degree of the two-way valves 121, 122, 123, and 124 and the expansion valves 111, 112, and 113 and switching the flow path of the refrigerant. (Supplying heated hot water) and performing boiling operation, cooling operation for cooling the air-conditioned space, heating operation for heating the air-conditioned space, boiling and cooling in parallel The boiling / cooling operation performed in this manner, and the boiling / heating operation performed in parallel with the boiling and heating can be selectively executed.

  At this time, the air conditioner unit 200 can be operated by an appropriate operation unit 60 (hereinafter simply referred to as “remote controller 60”) such as a remote controller. That is, the remote controller 60 is connected to, for example, the air conditioner control unit 430 so as to be able to transmit and receive information, and the user manually operates the remote controller 60 appropriately to thereby perform the above-described boiling operation, cooling operation, and heating. It is possible to instruct which driving operation is performed. Regarding boiling / cooling operation (or boiling / heating operation), when the user gives an instruction for the cooling operation (or heating operation) via the remote controller 60, the state of hot water storage in the hot water storage tank 2 (unheated water) Depending on the amount of the water and the like) and automatically switching to the boiling / cooling operation (or boiling / heating operation) as appropriate. Further, by appropriate operation on the remote controller 60, the boiling mode during the boiling operation (for example, the strong boiling mode, the normal boiling mode, etc.), and the air conditioner operation mode (for example, the powerful mode) during the cooling operation or heating operation. Mode, normal mode, power saving mode, etc.), air conditioner set temperature Tcon, etc. can also be instructed. The contents of instructions from these remote controllers 60 are input to the air conditioner control unit 430 provided in the air conditioner unit 200, and further, the heat pump control unit 410 provided in the heat pump unit 300 and the hot water storage unit 100 as appropriate. It is also input to hot water storage control unit 420 (may be received via air conditioner control unit 430 or may be received directly from remote control 60).

  Next, the heat pump control unit 410 provided in the heat pump unit 300 will be described. Although not shown in detail, the heat-pon control unit 410 includes a storage unit that stores various data and programs, and a control unit that performs calculation / control processing. The functional configuration of the heat-pon control unit 410 will be described with reference to FIG.

  As shown in FIG. 3, the heat pump control unit 410 functionally includes a four-way valve control unit 410A, a compressor control unit 410B, an expansion valve control unit 410C, and an outdoor fan control unit 410D.

  The four-way valve control unit 410A is instructed by the remote controller 60 as to which operation to perform (boiling operation, cooling operation, heating operation), and the hot water storage temperature detected by the hot water storage temperature sensor 12. Are entered. The four-way valve control unit 410A actually operates the heat pump water heater 1 in accordance with the operation instruction and the heating state (hot water storage state) of the hot water corresponding to the hot water storage temperature (boiling operation, cooling operation). Operation, boiling / cooling operation, heating operation, boiling / heating operation), and corresponding operation information includes the compressor control unit 410B, the expansion valve control unit 410C, the outdoor fan control unit 410D, And it outputs to the hot water storage control part 420 and the air-conditioner control part 430. The four-way valve control unit 410A outputs an opening / closing signal corresponding to the determined operation mode to the four-way valve 31, and switches the four-way valve 31 (detailed control content will be described later).

  The compressor control unit 410B includes the outside air temperature Tair detected by the outside air temperature sensor 22, the indoor temperature Tr detected by the indoor temperature sensor 34, and the air conditioner set temperature Tcon set by the remote controller 60. And the boiling mode are input (in addition to the case of direct input, the indirect input is also included, and so on). The compressor control unit 410B is input from the four-way valve control unit 410A as described above (any of boiling operation, cooling operation, boiling / cooling operation, heating operation, and boiling / heating operation is performed). The number of rotations of the compressor 14 is controlled based on at least one of the input temperature and setting according to the operation information (detailed control content will be described later). The rotation speed (control value) of the compressor 14 at this time is also output to an expansion valve control unit 420B of a hot water storage control unit 420 (not shown).

  The expansion valve control unit 410C includes the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20, the refrigerant outflow temperature T2 detected by the outflow temperature sensor 21, and the intake temperature sensor 32. The refrigerant suction temperature Tin and the heat-pon heat exchange temperature Tex detected by the heat exchange temperature sensor 35 are input. The expansion valve control unit 410C controls the opening of the expansion valve 113 based on at least one of the input temperatures in accordance with the operation information from the four-way valve control unit 410A (detailed control). The contents will be described later).

  The outdoor fan control unit 410D receives the outside air temperature Tair detected by the outside air temperature sensor 22 and the air conditioner operation mode set by the remote controller 60. The outdoor fan control unit 410D controls the number of rotations of the outdoor fan 67 based on the outdoor air temperature Tair and the operation mode in accordance with the operation information from the four-way valve control unit 410A (detailed control content will be described later). .

  The operation mode may be determined by the hot water storage control unit 420 or the air conditioner control unit 430. In this case, the operation information corresponding to the determined operation mode is input to the heat pump control unit 410 from the hot water storage control unit 420 and the air conditioner control unit 430, and the four-way valve control unit 410A according to the input operation information. The compressor control unit 410B, the expansion valve control unit 410C, and the outdoor fan control unit 410D perform various controls.

  Next, the hot water storage control unit 420 provided in the hot water storage unit 100 will be described. The hot water storage control unit 420 includes a storage unit and a control unit, similar to the heat pump control unit 410, and its functional configuration will be described with reference to FIG.

  As shown in FIG. 4, the hot water storage control unit 420 functionally includes a pump control unit 420A, an expansion valve control unit 420B, and a two-way valve control unit 420C.

  The operation information from the heat pump control unit 410 and the boiling temperature Tb detected by the boiling temperature sensor 24 are input to the pump control unit 420A. The pump control unit 420A is input from the heat pump control unit 410 as described above (whether boiling operation, cooling operation, boiling / cooling operation, heating operation, or boiling / heating operation is performed). The number of rotations of the boiling pump 19 is controlled based on the inputted boiling temperature Tb in accordance with the operation information (detailed control content will be described later).

  The expansion valve control unit 420B includes the operation information from the heat pump control unit 410, the outside air temperature Tair detected by the outside air temperature sensor 22, the air conditioner operation mode set by the remote controller 60, and the heat pump. The rotation speed of the compressor 14 (control value, but the actual rotation speed of the compressor 14 detected by a known method may be input) input from the compressor control section 410B of the control section 410; The refrigerant outflow temperature T2 detected by the outflow temperature sensor 21, the refrigerant intake temperature Tin detected by the intake temperature sensor 32, and the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20 are input. The The expansion valve control unit 420B is configured to open the openings of the expansion valves 111 and 112 based on at least one of the input temperature, mode setting, and rotation speed in accordance with the operation information from the heat pump control unit 410. (Details of control contents will be described later).

  The operation information from the heat pump control unit 410 is input to the two-way valve control unit 420C. The two-way valve control unit 420C controls the opening / closing operation of the two-way valves 121, 122, 123, and 124 based on the operation information (detailed control content will be described later).

  As described above, the operation mode may be determined in the hot water storage control unit 420 (for example, the two-way valve control unit 420C) or the air conditioner control unit 430. In this case, the pump control unit 420A, the expansion valve control unit 420B, and the two-way valve control unit 420C perform various controls according to the operation information corresponding to the operation mode determined by the two-way valve control unit 420C and the air conditioner control unit 430. I do.

  Next, the air conditioner control unit 430 provided in the air conditioner unit 200 will be described. The air conditioner control unit 430 includes a storage unit and a control unit, similar to the heat pump control unit 410 and the hot water storage control unit 420, and its functional configuration will be described with reference to FIG.

  As shown in FIG. 5, the air conditioner control unit 430 functionally includes an indoor fan control unit 430A.

  The indoor fan control unit 430A receives the operation information from the heat-pump control unit 410, the indoor temperature Tr detected by the indoor temperature sensor 34, and the air conditioner set temperature Tcon set by the remote controller 60. Is done. The indoor fan control unit 430A controls the number of revolutions of the indoor fan 77 based on the indoor temperature Tr and the air conditioner set temperature Tcon in accordance with the operation information from the heat-pump control unit 410 (detailed control content will be described later). ).

  As described above, the operation mode may be determined in the air conditioner control unit 430 or the hot water storage control unit 420. In this case, the indoor fan control unit 430A performs the control according to the operation information corresponding to the operation mode determined by the air conditioner control unit 430 and the hot water storage control unit 420.

  As described above, the heat pump water heater 1 according to the present embodiment can selectively execute five types of operation including boiling operation, cooling operation, heating operation, boiling / cooling operation, and boiling / heating operation. . Hereinafter, details of each operation will be sequentially described.

  First, boiling operation will be described with reference to FIG. In the boiling operation shown in FIG. 6, the four-way valve control unit 410A causes the four-way valve 31 to connect the pipe part 18a to the pipe part 18b and to connect the pipe part 18c to the pipe part 18d. The position is switched to the heating position (the heating side described above). The two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the closed state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in a fully closed state, and the expansion valve control unit 410C opens the expansion valve 113 (details will be described later as ΔH Is being controlled).

  As a result, the discharge side piping section 18a → the piping section 18b → the communication pipe 101 → the piping section 25a → the piping section 25b → the refrigerant side flow path 15b of the water refrigerant heat exchanger 15 → the piping section 25c (expansion). Valve 111) → Pipe part 25e → Communication pipe line 102 → Pipe part 18e (expansion valve 113) → Outdoor heat exchanger 17 → Pipe part 18d → Refrigerant path of the suction side pipe part 18c of the compressor 14 is formed. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the flow on the refrigerant side of the water refrigerant heat exchanger 15 functioning as a condenser is performed. In the channel 15b, heat exchange is performed with the water flowing through the water-side channel 15a to release heat to the water and change into a high-pressure liquid while heating. The refrigerant thus turned into a liquid is decompressed by the expansion valve 113 through the fully opened expansion valve 111 and becomes a low-temperature / low-pressure liquid and easily evaporates. In the outdoor heat exchanger 17 functioning as an evaporator, The heat is exchanged with the outside air to evaporate and change into gas, thereby absorbing heat and returning to the compressor 14 again as a low temperature / low pressure gas. At this time, the low-temperature water (unheated water) taken out from the heating forward pipe 5 connected to the lower part of the hot water storage tank 2 receives heat from the condensing refrigerant in the water-side flow path 15a of the water-refrigerant heat exchanger 15. Then, after being heated to a high temperature, the hot water is returned to the hot water storage tank 2 from the heating return pipe 6 connected to the upper part of the hot water storage tank 2 so that the hot water (heated water) is sequentially stored in the hot water storage tank 2 in a laminated form. The

  In the above operation, the rotational speed of the compressor 14 is determined based on the outside air temperature Tair under the control of the compressor controller 410B. That is, when the outside air temperature Tair is low, the compressor rotation speed is controlled to be large, and when the outside air temperature Tair is high, the compressor rotation speed is controlled to be small. The rotational speed of the outdoor fan 67 is determined based on the outdoor air temperature Tair under the control of the outdoor fan control unit 410D. That is, when the outside air temperature Tair is low, the fan rotation speed is controlled to be large, and when the outside air temperature Tair is high, the fan rotation speed is controlled to be small.

  The number of rotations of the boiling pump 19 is feedback-controlled by the control of the pump control unit 420A so that the boiling temperature Tb becomes a predetermined target temperature. That is, when the boiling temperature Tb is lower than the target temperature, control is performed such that the pump rotational speed is decreased (the flow rate is decreased), and when the boiling temperature Tb is higher than the target temperature, the pump rotational speed is increased (the flow rate is decreased). To be increased). The indoor fan 77 is stopped from rotating under the control of the indoor fan control unit 430A.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the boiling operation. Specifically, the opening of the expansion valve 113 is set at a predetermined cycle so that the temperature difference ΔH = Tout−T2 between the refrigerant discharge temperature Tout and the refrigerant outflow temperature T2 becomes a predetermined target temperature difference ΔHm. Perform feedback control (ΔH control). That is, the expansion valve control unit 410C controls the opening degree of the expansion valve 113 to close when ΔH <ΔHm, and opens the opening degree of the expansion valve 113 when ΔH> ΔHm. If ΔH = ΔHm, the opening degree of the expansion valve 113 is maintained as it is. Alternatively, instead of the ΔH control, the opening degree of the expansion valve 113 may be feedback controlled so that the refrigerant discharge temperature Tout becomes a predetermined constant value (discharge control). In this case, the expansion valve control unit 410C controls the opening degree of the expansion valve 113 to close when the refrigerant discharge temperature Tout is too low, and opens the opening degree of the expansion valve 113 when the refrigerant discharge temperature Tout is too high. Control in the direction.

  Next, the heating operation will be described with reference to FIG. In the heating operation shown in FIG. 7, the four-way valve 31 is switched to the heating side by the four-way valve control unit 410A as in the boiling operation. The two-way valve controller 420C switches the two-way valve 121 to the closed state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be fully closed and the expansion valve 112 to be fully open, and the expansion valve control unit 410C opens the expansion valve 113 (detailed below is SH control). Is controlled).

  As a result, the piping part 18a on the discharge side of the compressor 14 → the piping part 18b → the communication line 101 → the piping part 25a → the piping part 25d → the communication line 104 → the piping part 26a → the indoor heat exchanger 27 → the piping part 26b → Communication pipe 103 → pipe part 25g (expansion valve 112) → pipe part 25e → communication pipe line 102 → pipe part 18e (expansion valve 113) → outdoor heat exchanger 17 → pipe part 18d → pipe on the suction side of the compressor 14 A refrigerant path of the portion 18c is formed. As a result, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the indoor heat exchanger 27 functioning as a condenser exchanges heat with the indoor air. The heat is released to change into a high-pressure liquid while heating the air-conditioning target space. The refrigerant thus turned into a liquid is decompressed in the expansion valve 113 through the fully opened expansion valve 112 and becomes a low-temperature / low-pressure liquid and easily evaporates. In the outdoor heat exchanger 17 functioning as an evaporator, The heat is exchanged with the outside air to evaporate and change into gas, thereby absorbing heat and returning to the compressor 14 again as a low temperature / low pressure gas.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the room temperature Tr and the air conditioner set temperature Tcon under the control of the compressor control unit 410B. That is, when the value of Tcon-Tr is large, the compressor rotational speed is controlled to be large, and when the value of Tcon-Tr is small, the compressor rotational speed is controlled to be small. The rotational speed of the outdoor fan 67 is determined based on the outdoor air temperature Tair and the air conditioner operation mode under the control of the outdoor fan control unit 410D. That is, in each of a plurality of prepared air conditioner operation modes (for example, the high power mode, the normal mode, the power saving mode, etc.), when the outside air temperature Tair is low, the fan speed is controlled to increase, and when the outside air temperature Tair is high. The fan speed is controlled to be small.

  The rotational speed of the indoor fan 77 is determined based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon under the control of the indoor fan control unit 430A. That is, when the value of Tcon-Tr is large, control is performed so that the fan rotational speed is increased, and when the value of Tcon-Tr is small, control is performed so that the fan rotational speed is decreased. The boiling pump 19 is stopped from rotating under the control of the pump control unit 420A.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the heating operation. Specifically, the opening degree of the expansion valve 113 is feedback-controlled so that the temperature difference Tin-Tex between the refrigerant suction temperature Tin and the heat-pump heat exchange temperature Tex becomes a predetermined constant value (SH control). That is, the expansion valve control unit 410C controls the opening of the expansion valve 113 to close when Tin-Tex is too small, and controls the opening of the expansion valve 113 to open when Tin-Tex is too large. To do.

  Next, boiling and heating operation will be described with reference to FIG. Also in the boiling / heating operation shown in FIG. 8, the four-way valve control unit 410A switches the four-way valve 31 to the heating side. The two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in a fully open state, and the expansion valve control unit 410C opens the expansion valve 113 (details are the discharge control described later). To be controlled).

  As a result, the refrigerant path is divided into two through the piping part 18a on the discharge side of the compressor 14 → the piping part 18b → the communication pipe 101 → the piping part 25a, and one is the piping part 25b → the water refrigerant heat exchanger 15. The refrigerant side flow path 15b → pipe part 25c (expansion valve 111) is reached to the pipe part 25e, and the other is the pipe part 25d → communication conduit 104 → pipe part 26a → indoor heat exchanger 27 → pipe part 26b → It joins to the said piping part 25e through the communication pipe line 103-> piping part 25g (expansion valve 112). The subsequent path is the piping portion 25e → the communication conduit 102 → the piping portion 18e (expansion valve 113) → the outdoor heat exchanger 17 → the piping portion 18d → the suction side piping portion 18c of the compressor 14.

  As a result, the refrigerant in the gas state sucked at a low temperature and a low pressure is compressed by the compressor 14 to become a high temperature and a high pressure gas, and then divided as described above, and the one flow is the water refrigerant heat exchanger. 15 (functions as a condenser) is condensed in the same manner as described above to heat the water flowing through the water-side flow path 15a, thereby supplying hot water (heated water) sequentially into the hot water storage tank 2, and the other flow is In the indoor heat exchanger 27 (functioning as a condenser), the air-conditioning target space is heated by condensing in the same manner as described above and releasing heat to the indoor air. The refrigerant that has changed into a high-pressure liquid by condensation in the heat exchangers 15 and 27 is decompressed by the expansion valve 113 to become a low-temperature / low-pressure liquid, and then in the outdoor heat exchanger 17 (functions as an evaporator). It evaporates and absorbs heat from the outside air, and returns to the compressor 14 again as a low temperature / low pressure gas.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon, as in the heating operation, under the control of the compressor control unit 410B. The determination based on the outside air temperature Tair, which is the same as in the upper operation, is taken into account (details are omitted). The rotational speed of the outdoor fan 67 is controlled by the outdoor fan control unit 410D in the same manner as in the heating operation, based on the outdoor air temperature Tair and the air conditioner operation mode, when the outdoor air temperature Tair is low in each air conditioner operation mode. When the outside air temperature Tair is high, the fan rotation speed is controlled so as to decrease so that the fan rotation speed increases.

  The number of revolutions of the boiling pump 19 is controlled by the pump control unit 420A, as in the above-described boiling operation, when the boiling temperature Tb is lower than the target temperature, the number of revolutions of the pump becomes small, and the boiling temperature Tb is When the temperature is higher than the target temperature, the pump speed is controlled to be large. Further, the rotation speed of the indoor fan 77 is controlled by the indoor fan control unit 430A based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon as in the heating operation, when the value of Tcon-Tr is large. When the value of Tcon-Tr is small, the fan speed is controlled to be small so that the fan speed is large.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the boiling / heating operation. Specifically, the opening degree of the expansion valve 113 is feedback controlled (discharge control) so that the refrigerant discharge temperature Tout becomes a predetermined constant value, and when the refrigerant discharge temperature Tout is too low, the opening degree of the expansion valve 113 is closed. If the refrigerant discharge temperature Tout is too high, the opening of the expansion valve 113 is controlled to open.

  Next, the cooling operation will be described with reference to FIG. In the cooling operation shown in FIG. 9, the four-way valve control unit 410A causes the four-way valve 31 to connect the pipe part 18a to the pipe part 18d and to connect the pipe part 18c to the pipe part 18b. It is switched to a position (cooling side different from the heating side). Further, the two-way valve control unit 420C switches the two-way valve 121 to the closed state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state as in the heating operation. It is done. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully closed state and the expansion valve 112 to be in an open state (specifically, feedforward control described below is performed), and the expansion valve control The expansion valve 113 is controlled to be fully opened by the portion 410C.

  As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18d → the outdoor heat exchanger 17 → the piping section 18e (expansion valve 113) → the communication conduit 102 → the piping section 25e → the piping section 25g (expansion valve 112). → Communication line 103 → Pipe part 26b → Indoor heat exchanger 27 → Pipe part 26a → Communication line 104 → Pipe part 25d → Pipe part 25a → Communication line 101 → Pipe part 18b → Piping on the suction side of the compressor 14 A refrigerant path of the portion 18c is formed. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the outdoor heat exchanger functioning as a condenser with the rotational driving of the outdoor fan 67. In 17, heat is exchanged with the outside air to release heat and change to a high-pressure liquid. The refrigerant that has become liquid in this manner is decompressed by the expansion valve 112 through the fully opened expansion valve 113 and becomes a low-temperature / low-pressure liquid that easily evaporates, and functions as an evaporator when the indoor fan 77 is driven to rotate. The indoor heat exchanger 27 absorbs heat from the indoor air, evaporates and changes to gas, thereby cooling the air-conditioning target space and returns to the compressor 14 again as low-temperature and low-pressure gas.

  In the above operation, as in the heating operation, the rotation speed of the compressor 14 is controlled by the compressor control unit 410B so that the compressor rotation speed increases when the value of Tcon-Tr is large. When the value of Tcon-Tr is small, the compressor rotational speed is controlled to be small. The rotation speed of the outdoor fan 67 is controlled by the outdoor fan control unit 410D so that the fan rotation speed is increased when the air conditioner operation mode is, for example, the high-power mode, and in the normal mode or the power saving mode. The rotation speed is controlled to be small. Further, in each air-conditioner operation mode, control is performed so that the fan speed decreases when the outside air temperature Tair is low, and the fan speed increases when the outside air temperature Tair is high. The rotational speed of the indoor fan 77 is controlled by the indoor fan control unit 430A so that the fan rotational speed increases when the Tcon-Tr value is large, and the fan speed when the Tcon-Tr value is small. The rotation speed is controlled to be small. The boiling pump 19 is stopped from rotating under the control of the pump control unit 420A.

  The opening degree of the expansion valve 112 is variably controlled by the expansion valve control unit 420B according to the operating state of the cooling operation. That is, it is determined based on the outside air temperature Tair, the air conditioner operation mode, and the rotational speed of the compressor 14. That is, the expansion valve control unit 420B determines whether the outside air temperature Tair is high or low and the compressor from the compressor control unit 410B in each of the plurality of air conditioner operation modes (for example, the strong mode, the normal mode, and the power saving mode). The opening degree of the expansion valve 112 is feedforward controlled in consideration of the rotational speed (details are omitted).

  Next, boiling / cooling operation will be described with reference to FIG. In the boiling / cooling operation shown in FIG. 10, the four-way valve control unit 410A switches the four-way valve 31 to the heating side (not the cooling side). Further, the two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the closed state, the two-way valve 123 to the closed state, and the two-way valve 124 to the open state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in an open state (detailed below, ΔH control is performed). The expansion valve 113 is controlled to be fully opened by the portion 410C.

  As a result, the refrigerant path is the piping side 18a on the discharge side of the compressor 14 → the piping part 18b → the communication pipe 101 → the piping part 25a → the piping part 25b → the flow path 15b on the refrigerant side of the water refrigerant heat exchanger 15 → the piping. Part 25c (expansion valve 111) → piping part 25g (expansion valve 112) → communication pipe line 103 → piping part 26b → indoor heat exchanger 27 → piping part 26a → communication pipe line 104 → piping part 25d → piping part 25f → piping Portion 25e → Communication pipeline 102 → Pipe portion 18e (expansion valve 113) → Outdoor heat exchanger 17 → Pipe portion 18d → Pipe portion 18c on the suction side of the compressor 14

  Thus, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, first, the water refrigerant heat exchanger 15 (functioning as a condenser) is used in the same manner as described above. The high-temperature water (heated water) is sequentially supplied into the hot water storage tank 2 by heating the water flowing through the water-side flow path 15a and the liquid refrigerant passes through the expansion valve 111 in a fully opened state. The expansion valve 112 is depressurized to become a low-temperature / low-pressure liquid and easily evaporates. When the indoor fan 77 is driven to rotate, the indoor heat exchanger 27 functioning as an evaporator absorbs heat from the indoor air and evaporates. The air-conditioning target space is cooled by changing to the above, and further, through the expansion valve 113, the outdoor fan 67 rotates and exchanges heat with the outside air in the outdoor heat exchanger 17 that functions as an evaporator. Evaporated to me it absorbs heat by varying the gas returns to the compressor 14 as a low-temperature low-pressure gas.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the room temperature Tr and the air conditioner set temperature Tcon, similar to that during the cooling operation, under the control of the compressor control unit 410B. Further, the rotation speed of the outdoor fan 67 is controlled by the outdoor fan control unit 410D, as in the cooling operation, so that the fan rotation speed increases when the outdoor air temperature Tair is low in each air conditioner operation mode. When the Tair is high, the fan rotation speed is controlled to be small, but the rotation speed is controlled to be lower than that during the cooling operation by an appropriate method.

  The number of rotations of the boiling pump 19 is controlled by the pump control unit 420A, as in the case of the boiling operation and the boiling / heating operation, when the boiling temperature Tb is lower than the target temperature. When the boiling temperature Tb is higher than the target temperature, the pump rotation speed is controlled to increase. Further, the rotation speed of the indoor fan 77 is controlled by the indoor fan control unit 430A, and the value of Tcon-Tr is large based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon as in the cooling operation or the like. In this case, control is performed so that the fan speed increases, and when the value of Tcon-Tr is small, the fan speed decreases.

  The opening degree of the expansion valve 112 is variably controlled by the expansion valve control unit 420B in accordance with the operating state of the boiling / cooling operation. Specifically, similar to the control to the expansion valve 113 by the expansion valve control unit 410C during the boiling operation, the temperature difference ΔH = Tout−T2 between the refrigerant discharge temperature Tout and the refrigerant outflow temperature T2 is a predetermined value. The opening degree of the expansion valve 112 is feedback-controlled at a predetermined cycle so that the target temperature difference ΔHm is obtained (ΔH control). That is, the expansion valve control unit 420B controls the opening degree of the expansion valve 112 to close when ΔH <ΔHm, and opens the opening degree of the expansion valve 112 when ΔH> ΔHm. If ΔH = ΔHm, the opening degree of the expansion valve 112 is maintained as it is. Alternatively, instead of this ΔH control, the opening degree of the expansion valve 112 may be feedback controlled so that the refrigerant discharge temperature Tout becomes a predetermined constant value (discharge control). In this case, the expansion valve control unit 420B controls the opening degree of the expansion valve 112 to close when the refrigerant discharge temperature Tout is too low, and opens the opening degree of the expansion valve 112 when the refrigerant discharge temperature Tout is too high. Control in the direction.

  As described above in the description of the cooling operation and the boiling / cooling operation, the four-way valve 31 and the two-way valve 121 are the outdoor heat exchanger 17 as a condenser or the water / refrigerant heat exchange. It functions as a first connection means that can selectively connect the discharge side of the compressor 14 to the compressor 15. In addition, the two-way valve 123 and the expansion valve 111 are connected to the inlet side of the indoor heat exchanger 27 serving as an evaporator, and the outlet of the outdoor heat exchanger 17 serving as a condenser. The expansion valve 113 connected to the side or the water refrigerant heat exchanger 15 functions as second connection means that can be selectively connected. Further, the two-way valves 122 and 124 are provided on the outlet side of the indoor heat exchanger 27 as an evaporator with respect to the suction side of the compressor 14, and the outdoor heat exchanger as the expansion valve 113 and an evaporator. It functions as a third connecting means that can be selectively connected via the heat exchanger 17 or without the outdoor heat exchanger 17 as the evaporator and the expansion valve 113. The open / close behaviors of the four-way valve 31, the two-way valves 121 to 124, and the expansion valves 111 to 113 in each operation described above are collectively shown in FIG.

  Further, the two-way valve control unit 420C of the hot water storage control unit 420, and the four-way valve control unit 410A and the expansion valve control unit 410C of the heat pump control unit 410 are the first connection unit and the second connection unit. , Function as switching means for switching the third connection means.

  As described above, according to the heat pump water heater 1 of the present embodiment, the four-way valve 31 and the two-way valve 121 (functioning as a first connecting means), the two-way valve 123 and the expansion valve 111 (second). Function as connecting means), the two-way valves 122 and 124 (functioning as third connecting means) are the outdoor heat exchanger 17, the water-refrigerant heat exchanger 15, the indoor heat exchanger 27, the compressor 14, the expansion valve 112, The expansion valve 113 and the like can be selectively connected appropriately. For example, as shown in FIG. 9, the four-way valve 31 connects the discharge side of the compressor 14 to the outdoor heat exchanger 17 as a condenser, and the two-way valve 123 further connects the outdoor heat exchanger 17. It can be connected to the indoor heat exchanger 27 as an evaporator via expansion valves 113 and 112, and the two-way valve 122 can connect the indoor heat exchanger 27 to the suction side of the compressor 14. In this case, the high-temperature and high-pressure refrigerant gas discharged from the compressor 14 dissipates heat to the outside air in the outdoor heat exchanger 17 to condense into a liquid refrigerant, and then evaporates in the indoor heat exchanger 27 to absorb heat from the indoor air. The cooling operation returning to the compressor 14 is realized.

  Also, for example, as shown in FIG. 10, the four-way valve 31 and the two-way valve 121 connect the discharge side of the compressor 14 to the water refrigerant heat exchanger 15, and the expansion valve 111 has its water refrigerant heat. The exchanger 15 is connected to the indoor heat exchanger 27 as an evaporator via the expansion valve 112, and the two-way valve 124 connects the indoor heat exchanger 27 to the expansion valve 113 and the outdoor heat as an evaporator. It can also be connected to the suction side of the compressor 14 via the exchanger 17. In this case, the high-temperature and high-pressure refrigerant gas discharged from the compressor 14 dissipates heat to the water-side flow path 15b that leads to the hot water storage tank 2 in the water-refrigerant heat exchanger 15, condenses into a liquid refrigerant, and then the indoor heat exchanger After evaporating at 27, heat is absorbed from the room air, and further evaporating at the outdoor heat exchanger 17, the heat is also absorbed from the outside air and returned to the compressor 14. Thereby, the boiling / cooling operation for cooling the indoor air and heating the hot water in the hot water storage tank 2 is realized.

  In the boiling / cooling operation shown in FIG. 10, as described above, the heat absorption by the indoor heat exchanger 27 (functioning as an evaporator) and the outdoor heat exchanger 17 (functioning as an evaporator) are performed. Is used for heating hot water in the water-refrigerant heat exchanger 15 (functioning as a condenser). Therefore, for example, the cooling load is reduced with the passage of time after the start of operation, and the amount of heat absorbed by the indoor heat exchanger 27 is reduced (as described above, the rotational speed of the indoor fan 77 is usually set to the indoor temperature Tr and the air conditioner set temperature). Even if the heat absorption amount in the outdoor heat exchanger 17 is increased by an appropriate method (for example, the rotational speed of the outdoor fan 67 is increased). Thus, the heating capacity of hot water in the water-refrigerant heat exchanger 15 can be reliably maintained (without decreasing).

  As a result of the above, according to the heat pump water heater 1 of the present embodiment, by switching the connection by the four-way valve 31, the two-way valves 121 to 124, the expansion valves 111 to 113, etc., in the cooling operation (the outdoor heat exchanger 17 is In addition to securing normal indoor air cooling capacity (by using it as a condenser), heating capacity of hot water in the hot water storage tank 2 in boiling / cooling operation (by using the outdoor heat exchanger 17 as an evaporator) Can be ensured.

  In the present embodiment, in particular, the function of the first connecting means for selectively connecting the discharge side of the compressor 14 to the outdoor heat exchanger 17 or the water refrigerant heat exchanger 15 as a condenser, as an evaporator. The expansion valve 113 on the outlet side of the outdoor heat exchanger 17 as a condenser or the water refrigerant heat exchanger 15 is selectively connected to the expansion valve 112 connected to the inlet side of the indoor heat exchanger 27. The function of the two connection means, the outlet side of the indoor heat exchanger 27 as an evaporator is connected to the suction side of the compressor 14 via the expansion valve 113 and the outdoor heat exchanger 17 as an evaporator, or without them. The function of the third connecting means to be selectively connected is realized as a specific configuration combining various valves (four-way valve 31, two-way valves 121 to 124, expansion valves 111 to 113, etc. in the above example). Can do.

  In the present embodiment, in particular, the two-way valves 121 to 124 and the expansion valves 111 and 112 which are actuators necessary for executing the change of the refrigerant path in accordance with the operation switching include the hot water storage tank 2. For this reason, the hot water storage units 100 are large and have a large arrangement space. As a result, space can be saved as compared with the case where a part of them is arranged in the heat pump unit 300 or the air conditioner unit 200. Further, by collecting the actuators in the hot water storage unit 100 as described above, the heat pump unit 300 and the air conditioner unit 200 that are normally used for air conditioners can be used. As a result, the product configuration can be shared, and the cost can be reduced.

  In the present embodiment, in particular, during the cooling operation shown in FIG. 9, the upstream of the expansion valve 113 and the expansion valve 112 existing in the path from the outdoor heat exchanger 17 to the indoor heat exchanger 27 as an evaporator. The expansion valve 113 on the side is fully opened, and the valve opening degree of the expansion valve 112 on the downstream side is variably controlled (feedforward control in the above example). Here, if the expansion operation of the refrigerant is controlled by variably controlling the valve opening degree of the upstream side expansion valve 113, the refrigerant that has become low temperature and low pressure by the expansion valve 113 exits the heat pump unit 300 and passes through the communication conduit 102. It will be introduced into the hot water storage unit 100. In this case, when passing through the connection portion exposed to the outside from the heat pump unit 300 or the hot water storage unit 100 (that is, the communication conduit 102), the cool air of the refrigerant is discharged, resulting in a loss of heat. Further, passing through a relatively high temperature hot water storage unit 100 in a low temperature and low pressure state for a long distance (see distance L1 in FIG. 9) causes a heat loss due to the same cool air discharge, and a large pressure (because of the low pressure). Loss occurs, the refrigerant density in the compressor 14 decreases, and cooling operation efficiency decreases.

  According to the present embodiment, the upstream expansion valve 113 is fixed fully open, and the valve opening degree of the expansion valve 112 in the downstream hot water storage unit 100 is variably controlled to control the refrigerant expansion operation. Thereby, unlike the above, since the refrigerant exits the heat pump unit 300 and is introduced into the hot water storage unit 100 in a high temperature and high pressure state, the adverse effect of the heat loss is avoided. Furthermore, heat can be radiated to the outside air in the communication pipe line 102 exposed to the outside, so that the heat radiating section can be enlarged and the cooling operation efficiency is improved. Furthermore, since the amount of hot water supply is usually small in summer, a relatively large amount of unheated water is stored in the hot water storage tank 2, and the temperature in the hot water storage unit 100 is often lower than the outside air temperature. As a result, heat can be radiated into the hot water storage unit 100 not only in the communication pipe line 102 but also in a part upstream of the expansion valve 112 in the refrigerant pipe 25 (a part of the pipe part 25g and the pipe part 25e). Furthermore, the cooling operation efficiency can be improved by expanding the heat radiation section. Further, the low temperature and low pressure are limited to the downstream side of the expansion valve 112, and the adverse effect due to the increase in pressure loss is avoided by shortening the passing distance in the low temperature and low pressure state (see distance L2 in FIG. 9). be able to. Also by this, the cooling operation efficiency can be improved.

  Further, according to the present embodiment, as described above, the expansion valve 113 is fully opened and the valve opening degree of the expansion valve 112 in the hot water storage unit 100 is variably controlled during the boiling / cooling operation shown in FIG. The In this case, in the refrigerant path of the water refrigerant heat exchanger 15 → the expansion valve 112 → the indoor heat exchanger 27 as a condenser → the expansion valve 113 → the outdoor heat exchanger 17 as an evaporator, the water refrigerant heat exchanger 15 generates heat. The exchanged refrigerant can be reliably expanded to a low temperature and low pressure state at the expansion valve 112 and supplied to the indoor heat exchanger 27. Thereby, the highly efficient driving | operation using the heating (exhaust heat) to the hot water in the hot water storage tank 2 can be performed. Further, since such highly efficient boiling / cooling operation can be performed, it is possible to reduce the amount of heated water generated in the boiling operation, which is usually performed at night, for example. As a result, the amount of unheated water in the hot water storage tank 2 becomes relatively large, and the temperature in the hot water storage unit 100 tends to further decrease. Therefore, the upstream portion of the expansion valve 112 during the cooling operation is described above. The heat dissipating effect is further enhanced.

  In the present embodiment, in particular, during the boiling operation shown in FIG. 6, the expansion valve 111 in the hot water storage unit 100 is opened, and the valve opening degree of the expansion valve 113 in the heat pump unit 300 is variably controlled. In this case, in the refrigerant path of water refrigerant heat exchanger 15 → expansion valve 111 → expansion valve 113 → outdoor heat exchanger 17 as an evaporator (instead of controlling the expansion operation of the refrigerant by the expansion valve 111), the expansion valve By controlling the expansion operation of the refrigerant at 113, the distance to the heat pump heat exchanger that passes in a low-temperature and low-pressure state can be shortened (see distance L3 in FIG. 6). As a result, it is possible to avoid the adverse effects caused by the increase in pressure loss as described above, and to improve the boiling operation efficiency.

  In the present embodiment, in particular, during the heating operation shown in FIG. 7, the expansion valve 112 in the hot water storage unit 100 is fully opened, and the valve opening degree of the expansion valve 113 in the heat pump unit 300 is variably controlled (the above example). Then, SH control is performed. In this case, by controlling the expansion operation of the refrigerant not by the expansion valve 112 but by the expansion valve 113 in the refrigerant path of the indoor heat exchanger 27 → the expansion valve 112 → the expansion valve 113 → the outdoor heat exchanger 17 as an evaporator, The distance to the outdoor heat exchanger 17 that passes in a state of low temperature and low pressure can be shortened (see the distance L3 in FIG. 7).

  Also, during the boiling / heating operation shown in FIG. 8, the expansion valve 112 in the hot water storage unit 100 is fully opened, and the valve opening degree of the expansion valve 113 in the heat pump unit 300 is variably controlled (in the above example, the discharge Controlled). In this case, from the path of the piping part 18b on the discharge side of the compressor 14 → the piping part 25a, the piping part 25d → the piping part 26a → the indoor heat exchanger 27 → the piping part 26b → the piping part 25g (expansion valve 112), or In the refrigerant path of pipe part 25b → water refrigerant heat exchanger 15 → pipe part 25c, pipe part 25e → pipe part 18e (expansion valve 113) → outdoor heat exchanger 17 as an evaporator, by the outdoor heat exchanger 17 By controlling the expansion operation of the refrigerant with the close expansion valve 113, the distance to the heat pump heat exchanger that passes in a low-temperature and low-pressure state can be shortened as described above (see the distance L3 in FIG. 8).

  As a result, in any case of the heating operation and the boiling / heating operation, it is possible to avoid the adverse effects due to the increase in pressure loss as described above, and to improve the operation efficiency. Further, since the refrigerant passes through the hot water storage unit 100 in a high temperature and high pressure state, it is possible to prevent freezing around the hot water storage tank 2 in winter.

  In the present embodiment, in particular, the hot water storage unit 100 is connected to the heat pump unit 300 by two communication pipelines 101 and 102, and is connected to the air conditioner unit 200 by two other communication pipelines 103 and 104. (See FIG. 2, FIG. 1, etc.). As a result, in the hot water storage unit 100 having a relatively large structure and sufficient space, the number of required connection ports for the communication pipes is four (the connection ports 75a, 75b, 95a, and 95b). In the heat pump unit 300 and the air conditioner unit 200 that are small and have no space, only two connection ports for the communication pipes (the connection ports 68a and 68b and the connection ports 76a and 76b) are required. be able to.

  In addition, this invention is applicable to the range which does not change the meaning, without being limited to the above aspect. For example, at least one of the two-way valves 121 to 124 is an expansion valve with a closing function. It may be replaced with. Further, instead of the expansion valves 111 to 113, an ejector may be used as a decompressor.

1 Heat pump water heater 2 Hot water storage tank 4 Heating circulation circuit (hot water circulation circuit)
5 Heating pipe (hot water pipe)
6 Heating return pipe (hot water pipe)
DESCRIPTION OF SYMBOLS 14 Compressor 15 Water refrigerant heat exchanger 15a Refrigerant side flow path 15b Water side flow path 17 Outdoor heat exchanger (heat pump heat exchanger)
18 Refrigerant piping 27 Indoor heat exchanger 30 Refrigerant circulation circuit 31 Four-way valve (first connecting means)
67 Outdoor fan 68a, 68b Connection port 75a, 75b Connection port 77 Indoor fan 100 Hot water storage unit 101 Communication channel (first communication channel)
102 communication line (second communication line)
103 communication line (third communication line)
104 Communication line (4th communication line)
111 Expansion valve (third on-off valve, second connecting means)
112 Expansion valve (first decompressor)
113 Expansion valve (second pressure reducer)
121 Two-way valve (first on-off valve, first connection means)
122 Two-way valve (fourth on-off valve, third connection means)
123 Two-way valve (second on-off valve, second connection means)
124 Two-way valve (5th on-off valve, 3rd connecting means)
200 Heat pump unit (outdoor unit)
300 Air conditioner unit (indoor unit)
410 Heaton control unit 410A Four-way valve control unit (switching means)
410C expansion valve control unit (switching means)
420 hot water storage control unit 420C two-way valve control unit (switching means)
430 Air-conditioner control unit T2 Refrigerant outflow temperature Tair Outdoor temperature Tb Boiling temperature Tcon Air-conditioner set temperature Tex Heaton heat exchange temperature Tin Refrigerant intake temperature Tout Refrigerant discharge temperature Tr Indoor temperature

Claims (10)

A heat pump heat exchanger capable of selectively functioning as a condenser or an evaporator for performing heat exchange between the refrigerant and the outside air;
A compressor connected to the heat pump heat exchanger;
A hot water storage tank for storing hot water,
A water refrigerant heat exchanger as a condenser for performing heat exchange between the refrigerant and water;
An indoor heat exchanger capable of selectively functioning as a condenser or an evaporator for performing heat exchange between the refrigerant and room air;
A water circulation circuit is formed by annularly connecting the water side of the water refrigerant heat exchanger and the hot water storage tank with hot water piping,
In the heat pump water heater with an air conditioning function that forms a refrigerant circulation circuit by connecting the heat pump heat exchanger, the compressor, the refrigerant side of the water refrigerant heat exchanger, and the indoor heat exchanger with a refrigerant pipe,
A first connection means capable of selectively connecting a discharge side of the compressor to the heat pump heat exchanger as a condenser or the water refrigerant heat exchanger;
A second decompressor connected to the outlet side of the heat pump heat exchanger as the condenser, or the water refrigerant, with respect to the first decompressor connected to the inlet side of the indoor heat exchanger as the evaporator A second connection means capable of selectively connecting the heat exchanger;
The outlet side of the indoor heat exchanger as the evaporator is connected to the suction side of the compressor via the heat pump heat exchanger as the second decompressor and the evaporator, or as the evaporator. A heat pump water heater with a cooling and heating function, comprising: a third connection means that can be selectively connected without passing through the heat pump heat exchanger and the second pressure reducer. During cooling operation, the discharge side of the compressor, the heat pump heat exchanger as the condenser, the second decompressor, the first decompressor, the indoor heat exchanger as the evaporator, the compressor Switching the first connection means, the second connection means, and the third connection means so that the refrigerant flows in the path on the suction side of
During boiling / cooling operation, the discharge side of the compressor, the water refrigerant heat exchanger, the first decompressor, the indoor heat exchanger as the evaporator, the second decompressor, and the evaporator A switching means for switching the first connection means, the second connection means, and the third connection means so that the refrigerant flows through a path on the suction side of the compressor. The heat pump water heater with an air conditioning function according to claim 1. The first connection means includes
A four-way valve that selectively communicates the discharge side of the compressor with the inlet side of the water-refrigerant heat exchanger or the heat pump heat exchanger;
A first on-off valve capable of opening and closing a pipe line between the inlet side of the water-refrigerant heat exchanger and the four-way valve;
The second connection means includes
A second on-off valve capable of opening and closing a conduit between the second pressure reducer and the first pressure reducer;
A third on-off valve capable of opening and closing a pipe line between the outlet side of the water refrigerant heat exchanger and the first decompressor;
The third connection means includes
A fourth on-off valve capable of opening and closing a pipe line between the non-first decompressor side of the indoor heat exchanger and the compressor;
The air conditioning function according to claim 2, further comprising a fifth on-off valve capable of opening and closing a pipe line between the side opposite to the first pressure reducer of the indoor heat exchanger and the second pressure reducer. Heat pump water heater. The four-way valve and the second pressure reducer are:
It is provided in an outdoor unit containing the heat pump heat exchanger and the compressor,
The first to fifth on-off valves are
Provided in a hot water storage unit containing the hot water storage tank and the water refrigerant heat exchanger;
The first decompressor is
The heat pump water heater with an air conditioning function according to claim 3, wherein the heat pump water heater is provided in the hot water storage unit or in an indoor unit including the indoor heat exchanger. An outdoor fan for passing outside air through the heat pump heat exchanger;
An indoor fan for passing room air through the indoor heat exchanger;
During the cooling operation, the outdoor fan is rotationally driven to cause the heat pump heat exchanger to function as a condenser, and the indoor fan is rotationally driven to cause the indoor heat exchanger to function as an evaporator. ,
During the boiling / cooling operation, the outdoor fan is driven to rotate so that the heat pump heat exchanger functions as an evaporator, and the indoor fan is operated to function the indoor heat exchanger as an evaporator. Rotationally driven,
During cooling operation and boiling / cooling operation,
The air conditioning function according to claim 4, wherein the valve opening of the second pressure reducer is fixed in a fully open state, and the valve opening of the first pressure reducer is variably controlled according to an operating state. With heat pump water heater. The switching means is
During boiling operation, the refrigerant flows through the discharge side of the compressor, the water refrigerant heat exchanger, the second decompressor, the heat pump heat exchanger as the evaporator, and the suction side path of the compressor. The heat pump water heater with an air conditioning function according to claim 4 or 5, wherein the first connection means, the second connection means, and the third connection means are switched so as to flow. During boiling operation,
The heat pump water heater with an air conditioning function according to claim 6, wherein the third on-off valve is opened and the valve opening of the second pressure reducer is variably controlled according to the operating state. The switching means is
During heating operation, the discharge side of the compressor, the indoor heat exchanger as the condenser, the first decompressor, the second decompressor, the heat pump heat exchanger as the evaporator, and the compressor Switching the first connection means, the second connection means, and the third connection means so that the refrigerant flows in the path on the suction side of
At the time of boiling / heating operation, after diverting from the discharge side of the compressor to the indoor heat exchanger as the condenser and the water-refrigerant heat exchanger, the downstream side of the indoor heat exchanger The refrigerant flows from the first decompressor and the water-refrigerant heat exchanger through the second decompressor and the heat pump heat exchanger as the evaporator and through the path leading to the suction side of the compressor. The heat pump water heater with a cooling / heating function according to any one of claims 4 to 7, wherein the first connection means, the second connection means, and the third connection means are switched. During heating operation and boiling / heating operation,
9. The air conditioning function according to claim 8, wherein the valve opening of the first pressure reducer is fixed in a fully opened state, and the valve opening of the second pressure reducer is variably controlled according to an operating state. With heat pump water heater. The refrigerant circuit is
A first communication conduit that communicates the first on-off valve and the fourth on-off valve with the four-way valve;
A second communication line communicating the second on-off valve and the fifth on-off valve with the second pressure reducer;
A third communication line communicating the first pressure reducer and the first pressure reducer side of the indoor heat exchanger;
A fourth communication line communicating the fourth on-off valve and the fifth on-off valve with the anti-first pressure reducer side of the indoor heat exchanger;
With
The hot water storage unit and the outdoor unit are connected by the first communication line and the second communication line,
The air conditioning function according to any one of claims 4 to 9, wherein the hot water storage unit and the indoor unit are connected by the third communication pipe and the fourth communication pipe. With heat pump water heater.

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