WO2020065791A1

WO2020065791A1 - Air conditioning and hot water supply device

Info

Publication number: WO2020065791A1
Application number: PCT/JP2018/035793
Authority: WO
Inventors: 典夫高橋; 正俊村若
Original assignee: 日立ジョンソンコントロールズ空調株式会社
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2020-04-02
Also published as: CN111373216A; EP3859238A1; CN111373216B; JPWO2020065791A1; JP6671558B1; EP3859238A4

Abstract

Provided is an air conditioning and hot water supply device capable of appropriately performing a hot water supply operation or the like. This air conditioning and hot water supply device (W) is provided with a refrigerant circuit Q through which a refrigerant is circulated via a compressor (1), a heat exchanger (3) for hot water supply, an expanding valve (11), and an outdoor heat exchanger (4) in this order. Furthermore, the air conditioning and hot water supply device (W) is provided with a check valve (15) provided to a pipe (ke) that connects a low pressure-side connection port (he) of a four-way valve (8) and the suction side of the compressor (1).The high pressure-side connection port (hg) of the four-way valve (8) and the discharge side of the compressor (1) are shut off by the expanding valve (10).The check valve (15) allows the flow of the refrigerant from the four-way valve (8) toward the suction side of the compressor (1) via the pipe (ke), and inhibits the flow in the reverse direction.

Description

Air conditioning hot water supply system

The present invention relates to an air conditioning and hot water supply device.

技術 Regarding an air-conditioning and hot-water supply device for performing air-conditioning and hot water supply, for example, a technique described in Patent Document 1 is known. That is, Patent Document 1 discloses that during cooling air conditioning operation in which waste heat generated in an indoor heat exchanger is used for hot water supply in a hot water supply heat exchanger, the first condensation capacity of the outdoor heat exchanger and the second condensation capacity of the hot water supply heat exchanger are described. It describes that control is performed so that the total condensation capacity of the capacity and the capacity becomes a predetermined value.

JP 2013-213612 A

However, in the technology described in Patent Literature 1, the outdoor heat exchanger always functions as a condenser, so that only the hot water supply operation cannot be performed alone without performing the air conditioning operation. Further, in the technology described in Patent Document 1, no consideration is given to suppression of outflow of the refrigerant via the four-way valve during the hot water supply operation.

Therefore, an object of the present invention is to provide an air-conditioning and hot-water supply device that can appropriately perform a hot-water supply operation and the like.

In order to solve the above problems, an air conditioning hot water supply apparatus according to the present invention includes a compressor, a hot water supply heat exchanger, a first expansion valve, and a refrigerant circuit in which refrigerant circulates sequentially through an outdoor heat exchanger. , A main body, a valve body provided inside the main body, a four-way valve for switching the flow path of the refrigerant in the refrigerant circuit, a low-pressure side connection port of the four-way valve and a suction side of the compressor. A check valve provided in a first pipe to be connected, wherein a connection between a high-pressure side connection port of the four-way valve and a discharge side of the compressor is interrupted by first opening / closing means, and the check valve is The flow of the refrigerant from the four-way valve to the suction side of the compressor via the first pipe is allowed, and the flow in the opposite direction is prohibited.

According to the present invention, it is possible to provide an air-conditioning and hot-water supply device capable of appropriately performing a hot-water supply operation and the like.

It is a lineblock diagram including a refrigerant circuit of an air-conditioning hot-water supply device concerning an embodiment of the present invention. It is sectional drawing of the four-way valve with which the air-conditioning hot-water supply apparatus which concerns on embodiment of this invention is provided. It is sectional drawing which shows another state of the four-way valve with which the air-conditioning hot-water supply apparatus which concerns on embodiment of this invention is provided. It is a functional block diagram including a control device of an air-conditioning hot-water supply device concerning an embodiment of the present invention. It is explanatory drawing which shows the state of each valve, and the flow of a refrigerant | coolant at the time of cooling only operation | movement of the air conditioning hot-water supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the state of each valve and the flow of a refrigerant | coolant at the time of the cooling hot-water supply operation of the air-conditioning hot-water supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the state of each valve, and the flow of a refrigerant | coolant at the time of the 1st hot-water supply independent operation of the air conditioning hot-water supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the state of each valve, and the flow of a refrigerant | coolant at the time of the heating hot-water supply operation of the air-conditioning hot-water supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the state of each valve, and the flow of a refrigerant | coolant at the time of the 2nd hot-water supply independent operation of the air conditioning hot-water supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the state of each valve and the flow of a refrigerant | coolant at the time of the 2nd defrost driving | operation of the air conditioning hot-water supply apparatus which concerns on embodiment of this invention.

<< 1st Embodiment >>
<Configuration of air-conditioning water heater>
FIG. 1 is a configuration diagram including a refrigerant circuit Q of the air-conditioning and hot-water supply device W according to the embodiment.
The air conditioning and hot water supply device W is a device that performs air conditioning and hot water supply. FIG. 1 shows, as an example, a multi-type air-conditioning and hot-water supply device W including three indoor units Ui.
As shown in FIG. 1, the air-conditioning and hot-water supply device W includes a compressor 1, a hot-water storage tank 2, a hot-water supply heat exchanger 3, an outdoor heat exchanger 4, an outdoor fan 5, an indoor heat exchanger 6, An indoor fan 7. In addition, the air-conditioning and hot water supply device W includes a four-way valve 8, expansion valves 9 to 12,

solenoid valves

13 and 14, a check valve 15, and a control device 16 in addition to the components described above.

The compressor 1 is a device that compresses a low-temperature and low-pressure gas refrigerant and discharges it as a high-temperature and high-pressure gas refrigerant. As such a compressor 1, for example, a scroll compressor or a rotary compressor is used, but is not limited thereto.

The hot water storage tank 2 is a shell-like member for storing hot water. Although not shown in FIG. 1, a water supply pipe (not shown) for supplying water from a water supply source (not shown) to the hot water storage tank 2 is connected to a lower portion of the hot water storage tank 2. . A hot water supply pipe (not shown) for taking out high-temperature water stored in hot water storage tank 2 is connected to an upper portion of hot water storage tank 2. Then, the high-temperature water flowing through the hot water supply pipe and the water supplied from the water supply source are mixed in a predetermined manner, and the mixed hot water is supplied to a hot water supply terminal (not shown). .

The hot water supply heat exchanger 3 is a heat exchanger in which heat exchange is performed between the refrigerant flowing through the heat transfer tube 3a and the hot water stored in the hot water storage tank 2. Although FIG. 1 shows an example in which the hot water supply heat exchanger 3 is disposed inside the hot water storage tank 2, the present invention is not limited to this. That is, the heat exchanger 3 for hot water supply is arranged outside the hot water storage tank 2, and heat exchange is performed between hot water pumped from the hot water storage tank 2 by a pump (not shown) and the refrigerant flowing through the heat transfer tube 3 a. May be performed.

As shown in FIG. 1, one end p3 of the heat transfer tube 3a of the hot water supply heat exchanger 3 is connected to the discharge side of the compressor 1 via a pipe ka. The other end q3 of the heat transfer tube 3a is connected to one end p6 of each indoor heat exchanger 6 via a pipe kb (third pipe). That is, the pipe kb is branched into three, and the ends thereof are connected to the three indoor heat exchangers 6 one-to-one.

外 The outdoor heat exchanger 4 is a heat exchanger in which heat is exchanged between the refrigerant flowing through the heat transfer tube (not shown) and the outside air sent from the outdoor fan 5. One end p4 of the outdoor heat exchanger 4 is connected to one end p6 of each indoor heat exchanger 6 via a pipe kc and a pipe kb (partly) in that order. The other end q4 of the outdoor heat exchanger 4 is connected to another pipe ke (first pipe) via a pipe kd (second pipe). This pipe ke is a pipe connecting the suction side of the compressor 1 and the four-way valve 8.

The outdoor fan 5 is a fan that sends outside air to the outdoor heat exchanger 4 and is arranged near the outdoor heat exchanger 4.

The indoor heat exchanger 6 is a heat exchanger in which heat is exchanged between a refrigerant flowing through a heat transfer tube (not shown) and indoor air (air in a space to be air-conditioned) sent from an indoor fan 7. It is. One end p6 of each of the three indoor heat exchangers 6 is connected to the pipe kb as described above. The other ends q6 of the three indoor heat exchangers 6 are connected to a four-way valve 8 via a pipe kf. That is, the pipe kf is branched into three, and one end thereof is connected to the three indoor heat exchangers 6 in a one-to-one relationship.

The indoor fan 7 is a fan that sends indoor air to the indoor heat exchanger 6, and is arranged near the indoor heat exchanger 6.
The four-way valve 8 is a valve that switches the flow path of the refrigerant in the refrigerant circuit Q according to the operation mode. The configuration of the four-way valve 8 will be described with reference to FIGS. 2A and 2B.

FIG. 2A is a cross-sectional view of the four-way valve 8 included in the air-conditioning and hot-water supply device.
As shown in FIG. 2A, the four-way valve 8 includes a main body 81, a valve body 82, a pedestal 83, a connecting plate 84, and

pistons

85 and 86.
The main body 81 is a cylinder in which the

pistons

85 and 86 move, and has a cylindrical outer shape. A high pressure side connection port hg is provided at an upper portion of the main body 81. The high pressure side connection port hg is a hole for communicating the discharge side of the compressor 1 (see FIG. 1) with the four-way valve 8. One end of a pipe kg is connected to the high pressure side connection port hg.

ＡAs shown in FIG. 2A, a pedestal 83 is installed inside the main body 81 of the four-way valve 8 on the opposite side (lower side) of the high pressure side connection port hg. The pedestal 83 is a fixed member that is a counterpart when the valve body 82 moves while sliding. The pedestal 83 and the main body 81 are provided with an outdoor connection port hi, a low-pressure connection port he, and an indoor connection port hf, which are arranged side by side.

The outdoor connection port hi is a hole for communicating the outdoor heat exchanger 4 (see FIG. 1) with the four-way valve 8. One end of a pipe ki is connected to the outdoor connection port hi. The other end of the pipe ki (connection point m1 in FIG. 1) is connected to the pipe kd on the upstream side of the solenoid valve 13 (closer to the outdoor heat exchanger 4).

The low pressure side connection port he is a hole for connecting the suction side of the compressor 1 (see FIG. 1) and the four-way valve 8 via the check valve 15 and the like (see FIG. 1). One end of a pipe ke is connected to the low pressure side connection port he. The other end of the pipe ke is connected to the suction side of the compressor 1.

The indoor side connection port hf is a hole for communicating the other end q6 side of the indoor heat exchanger 6 (see FIG. 1) with the four-way valve 8. The indoor side connection port hf is connected to the hot water supply heat exchanger 3 via the pipe kf, the indoor heat exchanger 6, and the pipe kb (third pipe) sequentially.

The valve body 82 switches the flow path of the four-way valve 8 by its movement, and is provided inside the main body 81. As shown in FIG. 2A, the valve body 82 includes a curved portion 82a and a flange 82b. The curved portion 82a is curved in an upwardly convex ∩ shape in a vertical cross-sectional view. The flange 82b is formed integrally with the curved portion 82a, and extends laterally outward from the periphery of the curved portion 82a. The flange 82b slides with respect to the pedestal 83 while the valve body 82 moves in the lateral direction.

The connection plate 84 is a plate that connects the valve body 82 and the

pistons

85 and 86. The connecting plate 84 is fixed to the valve body 82 and both right and left ends thereof are fixed to

pistons

85 and 86. In the connection plate 84, a hole hx (the state shown in FIG. 2A) for connecting the outdoor connection port hi to the space above the valve element 82 and the indoor connection port hf are connected to the space above the valve element 82. Hole hy (the state of FIG. 2B) is provided.
The

pistons

85 and 86 move the valve body 82 and the connecting plate 84 in the left-right direction.

For example, at least when the cooling operation is performed, the valve body 82 is arranged at the “first position” shown in FIG. 2A. Thus, the high pressure side connection port hg and the outdoor side connection port hi communicate with each other via the space above the valve element 82. The indoor connection port hf and the low-pressure connection port he communicate with each other via a space below the valve element 82. Such a state of the four-way valve 8 is hereinafter referred to as a “first state”.

FIG. 2B is a cross-sectional view showing another state of four-way valve 8 provided in the air-conditioning and hot-water supply device.
For example, at least when the heating operation is performed, the valve body 82 is disposed at the “second position” illustrated in FIG. 2B. As a result, the high pressure side connection port hg and the indoor side connection port hf communicate with each other via the space above the valve element 82. The outdoor connection port hi and the low-pressure connection port he communicate with each other via a space below the valve element 82. Such a state of the four-way valve 8 is hereinafter referred to as a “second state”. The configuration of the four-way valve 8 shown in FIGS. 2A and 2B is an example, and is not limited to this.

Returning to FIG. 1, the description will be continued. In FIG. 1, the main body 81 and the valve body 82 are schematically illustrated with respect to the four-way valve 8, and illustration of other components is omitted.
The expansion valve 9 shown in FIG. 1 is a valve that is opened when the hot water supply operation is performed, and is provided in the pipe ka.
Another expansion valve 10 (first opening / closing means) is a valve that is opened when the high-pressure refrigerant discharged from the compressor 1 is guided to the four-way valve 8, and is provided in the pipe kg. One end of the pipe kg is connected to the high pressure side connection port hg. The other end of the pipe kg is connected to the pipe ka on the upstream side of the expansion valve 9.

The expansion valve 11 (first expansion valve) is a valve that reduces the pressure of the refrigerant during the hot water supply operation, and is provided on the pipe kb. More specifically, the expansion valve 11 is provided upstream of the branch point m2 of the pipe kb (closer to the hot water supply heat exchanger 3).
The expansion valve 12 (second expansion valve) is a valve that reduces the pressure of the refrigerant when a cooling operation or a heating operation is performed. The expansion valve 12 is provided near one end p6 of the indoor heat exchanger 6 in the pipe kb (third pipe).

When the outdoor heat exchanger 4 functions as an evaporator, the electromagnetic valve 13 (second opening / closing means) shown in FIG. 1 returns the refrigerant evaporated by the outdoor heat exchanger 4 to the suction side of the compressor 1. The valve is opened in the pipe kd (second pipe). The solenoid valve 13 is a two-way valve that can be switched between two states, open and closed (the same applies to the solenoid valve 14).

Also, a pipe kj (fourth pipe) shown in FIG. 1 is provided. The pipe kj has one end connected to the outdoor heat exchanger 4 side of the electromagnetic valve 13 in the pipe kd, and the other end connected to the hot water supply heat exchanger 3 side of the expansion valve 11 in the pipe kb. .
The solenoid valve 14 (third opening / closing means) is a valve that is opened when the refrigerant condensed in the hot water supply heat exchanger 3 is guided to the outdoor heat exchanger 4, and is provided on the pipe kj.

The check valve 15 is a valve that allows the flow of the refrigerant from the four-way valve 8 to the suction side of the compressor 1 via the pipe ke (first pipe), and prohibits the flow in the reverse direction. The check valve 15 is provided in a pipe ke that connects the low-pressure side connection port he of the four-way valve 8 and the suction side of the compressor 1. In the pipe ke, the downstream side of the check valve 15 and the outdoor heat exchanger 4 are connected via a pipe kd.

制御 The control device 16 shown in FIG. 1 is a device that controls each device of the air conditioning and hot water supply device W. Although not shown, the control device 16 includes electronic circuits such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and various interfaces. Then, the program stored in the ROM is read and expanded in the RAM, and the CPU executes various processes. The control device 16 controls each valve such as the four-way valve 8 in addition to the outdoor fan 5 and the indoor fan 7 based on detection values of various sensors (not shown) and signals from a remote controller.

In the example shown in FIG. 1, the compressor 1, the outdoor heat exchanger 4, the outdoor fan 5, the four-way valve 8, the expansion valves 9 to 11, the

solenoid valves

13, 14, the check valve 15, the control device 16, etc. It is provided in the outdoor unit Uo. On the other hand, the indoor heat exchanger 6 and the indoor fan 7 are provided in the indoor unit Ui.

FIG. 3 is a functional block diagram including the control device 16 of the air conditioning and hot water supply apparatus.
As shown in FIG. 3, the control device 16 includes a compressor control unit 16a, a fan control unit 16b, and a valve control unit 16c.
The compressor control unit 16a controls the compressor 1 based on the detection value of each sensor (“sensor input” shown in FIG. 3) and a signal from a remote controller (“remote control input” shown in FIG. 3).
The fan control unit 16b controls the outdoor fan 5 and the indoor fan 7 based on a detection value of each sensor and the like.
The valve control unit 16c controls the four-way valve 8, the expansion valves 9 to 12, and the solenoid valve 13 based on the detection values of the respective sensors.

Although FIG. 3 shows an example in which the control device 16 provided in the outdoor unit Uo (see FIG. 1) controls each device, the invention is not limited to this. That is, another control device (not shown) may be provided for each of the three indoor units Ui (see FIG. 1), and predetermined communication may be performed with the control device 16 of the outdoor unit Uo.
Next, each operation mode of the air conditioning and hot water supply device W will be described.

<Cooling alone operation>
FIG. 4 is an explanatory diagram showing the state of each valve and the flow of the refrigerant during the cooling only operation.
The “cooling independent operation” is an operation mode in which the cooling operation is performed independently without allowing the refrigerant to flow through the heat exchanger 3 for hot water supply. In FIG. 4, the

expansion valves

9 and 11 and the

solenoid valves

13 and 14 in the closed state are shown by hatching (shaded lines), and the expansion valve 10 in the open state and the expansion valve 12 whose opening is adjusted are outlined. (The same applies to FIGS. 5 to 8). Further, in FIG. 4, the flow path through which the refrigerant circulates is illustrated by a thick line.

際 When performing the cooling only operation, the control device 16 sets the four-way valve 8 to the “first state” (see FIG. 2A), as shown in FIG. Further, the control device 16 closes the

expansion valves

9 and 11 and the

solenoid valves

13 and 14, opens the expansion valve 10 (substantially fully opens), and appropriately adjusts the opening degrees of the three expansion valves 12.

Accordingly, the refrigerant does not flow through the hot water supply heat exchanger 3, the outdoor heat exchanger 4 functions as a condenser, and the indoor heat exchanger 6 functions as an evaporator. The refrigerant discharged from the compressor 1 passes through the four-way valve 8, the outdoor heat exchanger 4 (condenser), the expansion valve 12, the indoor heat exchanger 6 (evaporator), the four-way valve 8, and the check valve 15. The refrigerant is sequentially returned to the suction side of the compressor 1. As a result, the air in the air-conditioned space (not shown) provided with the indoor unit Ui is cooled.

<Cooling hot water supply operation>
FIG. 5 is an explanatory diagram showing the state of each valve and the flow of the refrigerant during the cooling hot water supply operation.
Note that the “cooling hot water supply operation” is an operation mode in which a cooling operation is performed while a coolant is passed through the hot water supply heat exchanger 3 to increase or increase boiling water.
When performing the cooling hot water supply operation, the control device 16 maintains the four-way valve 8 in the "first state" (see FIG. 2A), as shown in FIG. Further, the control device 16 closes the

expansion valves

10 and 11 and the electromagnetic valve 13, opens the expansion valve 9 and the electromagnetic valve 14, and adjusts the opening of the expansion valve 12 appropriately.

によって Thereby, the heat exchanger 3 for hot water supply and the outdoor heat exchanger 4 function as a condenser, while the indoor heat exchanger 6 functions as an evaporator. The refrigerant discharged from the compressor 1 is supplied to the four-way valve 8, the expansion valve 9, the hot water supply heat exchanger 3 (condenser), the solenoid valve 14, the outdoor heat exchanger 4 (condenser), the expansion valve 12, and the indoor. The heat is returned to the suction side of the compressor 1 through the heat exchanger 6 (evaporator), the four-way valve 8 and the check valve 15 in order. Thereby, a part of the heat of the refrigerant discharged from the compressor 1 can be used for hot water supply, and the remaining heat can be used for cooling.

When the temperature of hot water stored in hot water storage tank 2 becomes equal to or higher than a predetermined value during cooling hot water supply operation, control device 16 maintains four-way valve 8 in the “first state” (see FIG. 2A). Then, the mode is switched to the cooling only operation (see FIG. 4).

<First hot water supply alone operation>
FIG. 6 is an explanatory diagram showing the state of each valve and the flow of refrigerant during the first hot water supply independent operation.
In addition, the "first hot water supply independent operation" refers to an operation in which the four-way valve 8 is set to the "first state" (see FIG. 2A) without performing the air-conditioning operation, and the boiling and hot water is independently increased. Mode.
When performing the first hot water supply independent operation, the control device 16 sets the four-way valve 8 to the "first state" (see FIG. 2A), as shown in FIG. For example, when switching from the cooling only operation (see FIG. 4) to the first hot water supply independent operation or when switching from the cooling hot water supply operation (see FIG. 5) to the first hot water supply independent operation, the control device 16 controls the four-way valve 8 to operate. Maintain in the “first state”.

Therefore, even if the operation mode is switched in the summer, the four-way valve 8 may be maintained in the “first state”, so that it is not necessary to temporarily stop the refrigeration cycle (that is, stop the compressor 1). Therefore, since the operation mode can be quickly switched in the summer, comfort for the user can be improved.

When performing the first hot water supply independent operation, the control device 16 closes the

expansion valves

10 and 12 and the electromagnetic valve 14, opens the electromagnetic valve 13, and appropriately adjusts the opening of the expansion valve 11. Thus, the heat exchanger 3 for hot water supply functions as a condenser, while the outdoor heat exchanger 4 functions as an evaporator. That is, in the refrigerant circuit Q, the refrigerant discharged from the compressor 1 is supplied to the hot water supply heat exchanger 3 (condenser), the expansion valve 11 (first expansion valve), the outdoor heat exchanger 4 (evaporator), and the electromagnetic wave. Circulate through valve 13 in sequence.

中 During the first hot water supply operation alone, the four-way valve 8 is in the “first state”. Thereby, the indoor heat exchanger 6 communicates with the pipe ke (first pipe) via the pipe kf, the indoor connection port hf of the four-way valve 8 and the low-pressure connection port he in order. In other words, the four-way valve 8 is placed at the “first position” where the other end q6 side of the indoor heat exchanger 6 where the flow of the refrigerant is blocked at one end P6 side and the pipe ke (the first pipe). A valve element 82 is present.

膨張 Also, during the first hot water supply independent operation, the expansion valve 10 is in the closed state. That is, the connection between the high pressure side connection port hg of the four-way valve 8 and the discharge side of the compressor 1 is shut off by the expansion valve 10 (first opening / closing means). Therefore, in the four-way valve 8, the high-pressure refrigerant hardly flows into the space above the valve element 82.

では In such first hot water supply independent operation, the pressure of pressing the valve body 82 from above on the pedestal 83 (see FIG. 2A) of the four-way valve 8 becomes weak. However, in the summer months in which the first hot water supply alone operation is often performed, the temperature of the outside air is often higher than the temperature of the air in the air-conditioned space cooled by cooling. In the main body 81 of the four-way valve 8, the space above (outside) the valve element 82 communicates with the outdoor heat exchanger 4 via the outdoor connection port hi and the like. On the other hand, the space below (inside) the valve element 82 communicates with the indoor heat exchanger 6 via the indoor connection port hf and the like. Therefore, the temperature of the upper side of the valve body 82 tends to be higher than that of the lower side, and the pressure tends to be high.

As a result, since the valve element 82 is pressed from above against the pedestal 83 (see FIG. 2A) of the four-way valve 8, a gap is hardly generated between the pedestal 83 and the valve element 82. Therefore, the refrigerant flowing from the outdoor heat exchanger 4 via the pipe kd hardly flows out to the indoor heat exchanger 6 via the pipe ki, the four-way valve 8 and the pipe kf sequentially.

On the other hand, the upstream side of the pipe ke communicates with the indoor heat exchanger 6 via the low-pressure connection port he, the indoor connection port hf, and the pipe kf in order. Here, if the check valve 15 is not provided in the pipe ke, the gas refrigerant evaporated in the outdoor heat exchanger 4 is discharged from the pipe kd, the pipe ke (partially), the low-pressure side connection port he, and the chamber k. There is a possibility that the gas flows into the indoor heat exchanger 6 via the inner connection port hf and the pipe kf sequentially. As a result, a large amount of refrigerant is accumulated in the indoor heat exchanger 6 unnecessarily, which may cause a decrease in the efficiency of the refrigeration cycle.

On the other hand, in the present embodiment, the check valve 15 is provided in the pipe ke that connects the low-pressure side connection port he of the four-way valve 8 and the suction side of the compressor 1. Therefore, even when performing the first hot water supply independent operation, the gas refrigerant evaporated in the outdoor heat exchanger 4 is prevented from flowing out to the indoor heat exchanger 6 via the four-way valve 8, and the efficiency of the refrigeration cycle is improved. Can be planned.

In this embodiment, the refrigerant circulates sequentially through the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4 (first hot water supply alone). Operation: see FIG. 6) and another state in which the outdoor heat exchanger 4 functions as a condenser and the indoor heat exchanger 6 functions as an evaporator (cooling alone operation or cooling and hot water supply operation: see FIGS. 4 and 5) Can be switched from one to the other. When switching from one to the other, the position of the valve element 82 of the four-way valve 8 is maintained at the "first position" (see FIG. 2A). As a result, as described above, the operation mode can be switched quickly, and the comfort for the user can be increased.

電磁 During the first hot water supply alone operation, the solenoid valve 13 (second opening / closing means) is open. Thereby, the outdoor heat exchanger 4 and the suction side of the compressor 1 communicate with each other via the pipe kd and the pipe ke (partly) in order. Therefore, the refrigerant evaporated in the outdoor heat exchanger 4 can be returned to the suction side of the compressor 1.

中 During the first hot water supply operation alone, the expansion valve 12 (second expansion valve) and the solenoid valve 14 (third opening / closing means) are all closed. Thereby, while the outdoor heat exchanger 4 functions as an evaporator, the flow of the refrigerant to the indoor heat exchanger 6 can be cut off.

<Single heating operation>
Next, although not shown, the "heating alone operation" in which the heating operation is performed independently without flowing the refrigerant through the hot water supply heat exchanger 3 will be briefly described.
When performing the heating alone operation, the control device 16 sets the four-way valve 8 to the “second state” (see FIG. 2B), closes the

expansion valves

9, 11 and the electromagnetic valve 14, while the expansion valve 10 and the electromagnetic valve 13 is opened, and the opening of the expansion valve 12 is appropriately adjusted. Thereby, the indoor heat exchanger 6 functions as a condenser, and the outdoor heat exchanger 4 functions as an evaporator, so that the air in the air-conditioned space (not shown) is heated.

<Heating hot water supply operation>
FIG. 7 is an explanatory diagram showing the state of each valve and the flow of the refrigerant during the heating and hot water supply operation.
The “heating and hot water supply operation” is an operation mode in which the refrigerant is passed through the hot water supply heat exchanger 3 to perform the heating operation while raising or increasing the boiling water.
When performing the heating and hot water supply operation, the control device 16 sets the four-way valve 8 to the "second state" (see FIG. 2B), as shown in FIG. Further, the control device 16 closes the electromagnetic valve 14, opens the

expansion valves

9, 10 and the electromagnetic valve 13, and appropriately adjusts the degree of opening of the

expansion valves

11, 12.

Thereby, the heat exchanger 3 for hot water supply and the indoor heat exchanger 6 function as a condenser, and the outdoor heat exchanger 4 functions as an evaporator. The refrigerant discharged from the compressor 1 is guided to the hot water supply heat exchanger 3 via the expansion valve 9 and also to the four-way valve 8 via another expansion valve 10. The refrigerant guided from the compressor 1 to the hot water supply heat exchanger 3 (condenser) is guided through the expansion valve 11 to the pipe kc, while the refrigerant guided from the compressor 1 to the four-way valve 8 is cooled by the indoor heat. It is led to the pipe kc via the exchanger 6 (condenser) and the expansion valve 12 in order.

Part of the refrigerant that has joined at the pipe kc and further evaporated at the outdoor heat exchanger 4 (evaporator) is returned to the suction side of the compressor 1 via the electromagnetic valve 13. On the other hand, the remainder of the refrigerant evaporated in the outdoor heat exchanger 4 (evaporator) is returned to the suction side of the compressor 1 via the four-way valve 8 and the check valve 15 sequentially. Thereby, a part of the heat of the refrigerant discharged from the compressor 1 can be used for hot water supply, and the remaining heat can be used for heating.

<Second hot water supply alone operation>
FIG. 8 is an explanatory diagram showing the state of each valve and the flow of the refrigerant during the second hot water supply independent operation.
In addition, the "second hot water supply independent operation" refers to an operation in which the four-way valve 8 is set to the "second state" (see FIG. 2B) without performing the air-conditioning operation and the boiling water is increased or the boiling water is increased alone. Mode.
When performing the second hot water supply independent operation, control device 16 sets four-way valve 8 to the "second state" (see FIG. 2B), as shown in FIG. For example, when switching from the heating-only operation to the second hot-water supply independent operation, or when switching from the heating-hot-water supply operation (see FIG. 7) to the second hot-water supply independent operation, the control device 16 sets the four-way valve 8 to the “second state”. To maintain.

(4) As a result, even if the operation mode is switched in winter, the four-way valve 8 can be maintained in the "second state", so that there is no need to stop the refrigeration cycle (that is, stop the compressor 1). Therefore, the operation mode can be quickly switched in the winter season, so that comfort for the user can be improved.

When performing the second hot water supply independent operation, the control device 16 closes the

expansion valves

10 and 12 and the electromagnetic valve 14, opens the expansion valve 9 and the electromagnetic valve 13, and adjusts the opening degree of the expansion valve 11 appropriately. Adjust to Thus, the heat exchanger 3 for hot water supply functions as a condenser, while the outdoor heat exchanger 4 functions as an evaporator. In the refrigerant circuit Q, the refrigerant discharged from the compressor 1 is supplied with the hot water supply heat exchanger 3 (condenser), the expansion valve 11 (first expansion valve), the outdoor heat exchanger 4 (evaporator), and the electromagnetic wave. Circulate through valve 13 in sequence. A part of the refrigerant evaporated in the outdoor heat exchanger 4 is returned to the suction side of the compressor 1 via the four-way valve 8 and the check valve 15 in order.

During the second hot water supply operation alone, the four-way valve 8 is in the “second state”, so that the outdoor heat exchanger 4 is connected to the pipe kd (partly), the outdoor connection port hi of the four-way valve 8, and the low pressure. The pipe ke (first pipe) communicates with the side connection port he sequentially. In other words, the valve element 82 of the four-way valve 8 exists at the “second position” that allows the outdoor heat exchanger 4 to communicate with the pipe ke (first pipe).

膨張 During the second hot water supply operation alone, the expansion valve 10 is in the closed state. That is, the connection between the high pressure side connection port hg of the four-way valve 8 and the discharge side of the compressor 1 is shut off by the expansion valve 10 (first opening / closing means). Therefore, in the four-way valve 8, the high-pressure refrigerant hardly flows into the space above the valve element 82.

では In such a second hot water supply independent operation, the pressure for pressing the valve body 82 against the pedestal 83 (see FIG. 2B) becomes weak. However, in the winter season in which the second hot water supply single operation is often performed, the temperature of the outside air is often lower than the temperature of the air in the air-conditioned space heated by heating. In the main body 81 of the four-way valve 8, the space above (outside) the valve element 82 is communicated with the indoor heat exchanger 6 via the indoor connection port hf and the like. On the other hand, the space below (inside) the valve element 82 communicates with the outdoor heat exchanger 4 via the outdoor connection port hi and the like. Therefore, the temperature of the upper side of the valve body 82 tends to be higher than that of the lower side, and the pressure tends to be high. As a result, since the valve element 82 is pressed from above onto the pedestal 83 (see FIG. 2B) of the four-way valve 8, a gap is hardly generated between the pedestal 83 and the valve element 82.

The check valve 15 is provided so as to allow the flow of the refrigerant from the four-way valve 8 to the suction side of the compressor 1 via the pipe ke, and prohibit the flow in the reverse direction. Therefore, the flow of the refrigerant flowing toward the suction side of the compressor 1 through the pipe kd (partly), the pipe ki, the outdoor connection port hi, the low pressure side connection port he, and the pipe ke in order is checked by the check valve 15. There is no risk of being hindered.

In the present embodiment, the refrigerant circulates sequentially through the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4 (second hot water supply alone). Operation: see FIG. 8) and another state in which the indoor heat exchanger 6 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator (heating alone operation or heating and hot water supply operation: see FIG. 7). It is possible to switch from one of them to the other. When switching from one to the other, the position of the valve element 82 of the four-way valve 8 is maintained at the "second position" (see FIG. 2B). As a result, as described above, the operation mode can be switched quickly, and the comfort for the user can be increased.

電磁 During the second hot water supply operation alone, the solenoid valve 13 (second opening / closing means) is open. As a result, the refrigerant evaporated in the outdoor heat exchanger 4 can be returned to the suction side of the compressor 1 via the electromagnetic valve 13.

中 During the second hot water supply operation alone, the expansion valve 12 (second expansion valve) and the solenoid valve 14 (third opening / closing means) are all closed. Thereby, while the outdoor heat exchanger 4 functions as an evaporator, the flow of the refrigerant to the indoor heat exchanger 6 can be cut off.

In addition, at least when the cooling operation (only cooling operation, freezing / hot water supply operation: see FIGS. 4 and 5) is performed, the valve element 82 is disposed at the “first position” shown in FIG. You. On the other hand, when at least the heating operation (heating alone operation, heating / hot water supply operation: see FIG. 7) is performed, the valve body 82 is arranged at the “second position” shown in FIG. 2B.
Further, a case where at least the cooling operation has been performed before the start of the hot water supply alone operation (that is, as an operation mode immediately before the start of the hot water supply alone operation) and a case where at least the heating operation has been performed before the start of the hot water supply alone operation And the position of the valve element 82 of the four-way valve 8 during the hot water supply alone operation is different.

For example, before the start of the first hot water supply independent operation (see FIG. 6) when the valve element 82 of the four-way valve 8 is at the “first position” (see FIG. 2A), at least the cooling operation (FIG. (See FIG. 5). On the other hand, before starting the second hot water supply independent operation (see FIG. 8) when the valve element 82 of the four-way valve 8 is at the “second position” (see FIG. 2B), at least the heating operation (see FIG. 7) ) Has been done. Thus, the valve element 82 of the four-way valve 8 can be maintained at the “first position” in summer, while the valve element 82 can be maintained at the “second position” in winter. Therefore, in both summer and winter, the operation mode of the air-conditioning and hot water supply device W can be quickly switched without changing the state of the four-way valve 8.

≪Defrosting operation≫
When a large amount of frost adheres to the outdoor heat exchanger 4 functioning as an evaporator, a high-temperature refrigerant flows through a heat transfer tube (not shown) of the outdoor heat exchanger 4 to melt the frost, thereby improving the heat exchange efficiency. It is desirable to suppress the decrease in the temperature. Hereinafter, as such a defrosting operation, a first defrosting operation and a second defrosting operation will be sequentially described.

<First defrosting operation>
The first defrosting operation is an operation mode in which the frost of the outdoor heat exchanger 4 is melted using the heat of the hot and cold water in the hot water storage tank 2. The open / close state of each valve in the first defrosting operation is the same as in the heating and hot water supply operation (see FIG. 7) except for the degree of opening of the expansion valves 9 to 12. Therefore, the first defrosting operation will be described with reference to FIG. At the start of the first defrosting operation, the temperature of hot water stored in hot water storage tank 2 is relatively high.

際 When performing the first defrosting operation, the control device 16 sets the four-way valve 8 to the “second state” (see FIG. 2B), as shown in FIG. Further, the control device 16 closes the solenoid valve 14 while opening the solenoid valve 13 and appropriately adjusts the degree of opening of the expansion valves 9 to 12. The opening of the expansion valve 11 is substantially fully open.

For example, when shifting from the heating operation to the first defrosting operation, the control device 16 controls each valve including the four-way valve 8 as described above, and controls the expansion valve 11 that has been closed during the heating operation. Open almost completely. Then, the high-temperature refrigerant existing in the hot-water supply heat exchanger 3 flows into the outdoor heat exchanger 4 via the pipe kb (partly) and the pipe kc sequentially. Thereby, the frost adhering to the outdoor heat exchanger 4 is melted.

That is, during the defrosting operation in which the outdoor heat exchanger 4 is defrosted, the valve element 82 of the four-way valve 8 is in the “second position” (see FIG. 2B), and the compressor 1, the hot water supply heat exchanger 3 The refrigerant circulates sequentially through the expansion valve 11 (first expansion valve) and the outdoor heat exchanger 4.
Furthermore, the compressor 1, the expansion valve 10 in an open state (first opening / closing means), the four-way valve 8, the indoor heat exchanger 6, the expansion valve 12 (second expansion valve), and the outdoor heat exchanger 4 are sequentially connected. Refrigerant circulates. Thus, the heating operation can be continued while the outdoor heat exchanger 4 is being defrosted. The state in which the opening of the expansion valve 10 is adjusted to a predetermined value is also included in the above-mentioned "valve open state".

In addition, at the time of the heating operation and when shifting from one of the first defrosting operation to the other, it is not necessary to move the valve element 82 of the four-way valve 8, so that the operation mode can be quickly switched. . Therefore, comfort for the user can be enhanced.

<Second defrosting operation>
FIG. 9 is an explanatory diagram showing the state of each valve and the flow of the refrigerant during the second defrosting operation.
The “second defrosting operation” refers to performing defrosting by making the outdoor heat exchanger 4 function as a condenser and defrosting the outdoor heat exchanger 4 using the heat of hot water in the hot water storage tank 2. This is an operation mode in which is performed. At the start of the second defrosting operation, the temperature of hot water stored in hot water storage tank 2 is relatively high.

際 When performing the second defrosting operation, the control device 16 sets the four-way valve 8 to the “first state” (see FIG. 2A), as shown in FIG. Further, the control device 16 closes the expansion valve 11 and the electromagnetic valve 13, opens the electromagnetic valve 14, and appropriately adjusts the opening degrees of the

expansion valves

9, 10, and 12.

For example, when shifting from the heating operation to the second defrosting operation, if the solenoid valve 14 that has been closed during the heating operation is opened, the high-temperature refrigerant existing in the hot water supply heat exchanger 3 may be used. Flows into the outdoor heat exchanger 4 sequentially through the pipe kb (part), the pipe kj, and the pipe kd (part). Thereby, the frost adhering to the outdoor heat exchanger 4 is melted.

That is, during the defrosting operation for defrosting the outdoor heat exchanger 4, the refrigerant flowing sequentially through the compressor 1 and the hot water supply heat exchanger 3 bypasses the expansion valve 11 (first expansion valve), Furthermore, the refrigerant circulates sequentially through the outdoor heat exchanger 4, the expansion valve 12 (second expansion valve), the indoor heat exchanger 6, the four-way valve 8, and the check valve 15. Here, the valve element 82 of the four-way valve 8 exists at a “first position” that allows the other end q6 side of the indoor heat exchanger 6 to communicate with the pipe ke (first pipe). Thereby, the outdoor heat exchanger 4 functions as a condenser.

As a result, the frost in the outdoor heat exchanger 4 is quickly melted in combination with the high-temperature refrigerant guided from the hot water supply heat exchanger 3 to the outdoor heat exchanger 4. Therefore, in the second defrosting operation, the outdoor heat exchanger 4 can be defrosted in a shorter time than in the first defrosting operation.

Note that the defrosting operation of the outdoor heat exchanger 4 is not limited to the control described above. For example, the flow of the refrigerant to the hot water supply heat exchanger 3 is shut off by the expansion valve 9, and the outdoor heat exchanger 4 functions as a condenser, while the indoor heat exchanger 6 functions as an evaporator. The defrosting of the exchanger 4 may be performed.

<Effect>
According to the present embodiment, the check valve 15 allows the flow of the refrigerant from the four-way valve 8 to the suction side of the compressor 1 via the pipe ke, and prohibits the flow in the reverse direction. Accordingly, when the first hot water supply independent operation (see FIG. 6) or the second hot water supply independent operation (see FIG. 8) is being performed, the gas refrigerant evaporated in the outdoor heat exchanger 4 causes the four-way valve 8 to operate. Through this, it is possible to prevent the heat from flowing into the indoor heat exchanger 6. Therefore, the efficiency of the refrigeration cycle can be improved.

Further, at least when the cooling operation is switched from the state in which the cooling operation is being performed (see FIGS. 4 and 5) to the first hot water supply independent operation (see FIG. 6), the four-way valve 8 is in the "first state" (see FIG. 2A). ) Is maintained. On the other hand, at least when the heating operation is switched from the state in which the heating operation is being performed (see FIG. 7) to the second hot water supply independent operation (see FIG. 8), the four-way valve 8 is maintained in the "second state" (see FIG. Is done. Therefore, since the switching of the operation mode is performed promptly, the comfort for the user can be enhanced.

≪Modified example≫
As described above, the air-conditioning and hot-water supply device W according to the present invention has been described in the embodiments, but the present invention is not limited to these descriptions, and various changes can be made.
For example, in the embodiment (see FIG. 1), the configuration in which the expansion valve 9 is provided in the pipe ka and the expansion valve 10 (first opening / closing means) is provided in another pipe kg has been described. It is not always necessary to constitute each with a single valve. That is, instead of the

expansion valves

9 and 10, a three-way valve (first opening / closing means) may be provided at the connection point between the pipes ka and kg, or a four-way valve (first opening / closing means) may be provided. With such a configuration, the same effect as that of the embodiment can be obtained.

Also, an electromagnetic valve (not shown) is provided in place of the expansion valve 9 described in the embodiment (see FIG. 1), and an electromagnetic valve (first opening / closing means: not shown) is provided in place of another expansion valve 10. May be provided. The open / closed state of each solenoid valve in each operation mode is the same as the open / closed state of the

expansion valves

9 and 10.

In the embodiment (see FIG. 1), the configuration in which the check valve 15 is provided in the pipe ke has been described, but the present invention is not limited to this. For example, instead of the check valve 15, an expansion valve (not shown) may be provided in the pipe ke. Then, when the control device 16 performs the first hot water supply independent operation (see FIG. 6) or the second hot water supply independent operation (see FIG. 8), the control valve 16 closes the expansion valve (not shown). Is also good. Even with such a configuration, it is possible to suppress the gas refrigerant evaporated in the outdoor heat exchanger 4 from flowing out to the indoor heat exchanger 6 via the four-way valve 8.

The configuration of the air-conditioning and hot-water supply device W described in the embodiment is an example, and the present invention is not limited to this. For example, the solenoid valve 13 and the like may be omitted as appropriate. That is, a flow path (see FIGS. 6 and 8) through which the refrigerant circulates sequentially through the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4 is included. The air-conditioning and hot water supply device W including the refrigerant circuit Q further has the following configuration. That is, the air-conditioning and hot-water supply device W has a main body 81 and a valve element 82 provided inside the main body 81, a four-way valve 8 for switching the flow path of the refrigerant in the refrigerant circuit Q, and a low-pressure connection of the four-way valve 8. A check valve 15 provided on a pipe ke (first pipe) connecting the port he and the suction side of the compressor 1. Then, the connection between the high pressure side connection port hg of the four-way valve 8 and the discharge side of the compressor 1 is shut off by the expansion valve 10 (first opening / closing means), and the check valve 15 is connected to the pipe ke (first The flow of the refrigerant toward the suction side of the compressor 1 through the pipe (pipe) is permitted, and the flow in the opposite direction is prohibited. Thereby, the hot-water supply alone operation in the air-conditioning and hot-water supply device W can be appropriately performed.

In the embodiment, when performing the hot water supply alone operation at least after the cooling operation is performed, the control device 16 maintains the valve element 82 of the four-way valve 8 at the “first position” (see FIG. 2A). Although the processing has been described, the present invention is not limited to this.
That is, in the case of performing the hot water supply alone operation in which the hot water is heated by the hot water supply heat exchanger 3, the temperature of the indoor heat exchanger 6 is lower than the temperature of the outdoor heat exchanger 4, or the air conditioning of the indoor heat exchanger 6 When the temperature of the target space is lower than the temperature of the outside air, the control device 16 may perform the following processing. That is, in a state where the valve element 82 of the four-way valve 8 is at the “first position” (see FIG. 2A), the control device 16 controls the compressor 1, the hot water supply heat exchanger 3, The refrigerant may be circulated through the expansion valve 11 (first expansion valve) and the outdoor heat exchanger 4 sequentially.

A temperature sensor (not shown) is installed in each of the outdoor heat exchanger 4 and the indoor heat exchanger 6, and an indoor temperature sensor (not shown) for detecting the temperature of the space to be air-conditioned and an outside air temperature. It is assumed that an outdoor temperature sensor (not shown) for detecting is installed.
As described above, when the temperature of the indoor heat exchanger 6 is lower than the temperature of the outdoor heat exchanger 4, the control device 16 sets the valve body 82 of the four-way valve 8 to the “first position”. The pressure on the upper side (outside) of 82 becomes higher than that on the lower side (inside). Therefore, a gap is less likely to be formed between the valve element 82 and the pedestal 83 (see FIG. 2A), so that the refrigerant can be prevented from flowing out of the outdoor heat exchanger 4 to the indoor heat exchanger 8 via the four-way valve 8.

Further, when a plurality of indoor heat exchangers 6 are connected in parallel to the outdoor heat exchanger 4 and the hot water supply alone operation of heating hot water with the hot water supply heat exchanger 3 is performed, the control device 16 performs the following processing. Is preferable. That is, when at least one of the plurality of indoor heat exchangers 6 whose temperature is lower than the temperature of the outdoor heat exchanger 4 exists, or when the air conditioning target space of each of the plurality of indoor heat exchangers 6 When at least one of the four-way valve 8 has a temperature lower than the temperature of the outside air, the control device 16 determines that the valve body 82 of the four-way valve 8 is in the “first position” (see FIG. 2A). The refrigerant is circulated through the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4 sequentially. As a result, the pressure on the upper side of the valve body 82 tends to be higher than that on the lower side, and a gap is less likely to be formed between the valve body 82 and the pedestal 83 (see FIG. 2A).

In addition, when performing the hot water supply alone operation in which the hot water is heated by the hot water supply heat exchanger 3, the difference between the temperature of the indoor heat exchanger 6 and the temperature of the outdoor heat exchanger 4 is within a predetermined range. When the valve element 82 of the four-way valve 8 is in the “first position” (see FIG. 2A) before the start of the single operation (that is, at least when the cooling operation has been performed immediately before), the control device 16 It is preferable to perform the following processing. That is, the control device 16 maintains the valve body 82 at the “first position” and sequentially operates the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4. The refrigerant is circulated through. Thereby, it is possible to quickly switch to the hot water supply independent operation without moving the valve element 82 of the four-way valve 8.

Further, in the case of performing the hot water supply alone operation of heating the hot water with the hot water supply heat exchanger 3, when the temperature of the indoor heat exchanger 6 is higher than the temperature of the outdoor heat exchanger 4, or the air conditioning of the indoor heat exchanger 6 is performed. When the temperature of the target space is higher than the temperature of the outside air, the control device 16 preferably performs the following processing. That is, in a state where the valve element 82 of the four-way valve 8 is at the “second position” (see FIG. 2B), the control device 16 controls the compressor 1, the hot water supply heat exchanger 3, The refrigerant is circulated through the expansion valve 11 (first expansion valve) and the outdoor heat exchanger 4 sequentially.
As described above, when the temperature of the indoor heat exchanger 6 is higher than the temperature of the outdoor heat exchanger 4, the control device 16 sets the valve body 82 of the four-way valve 8 to the “second position”. The upper side of 82 is more likely to have a higher pressure than the lower side. Therefore, a gap is less likely to be formed between the valve element 82 and the pedestal 83 (see FIG. 2B), so that the refrigerant can be prevented from flowing out of the outdoor heat exchanger 4 to the indoor heat exchanger 8 via the four-way valve 8.

Further, when a plurality of indoor heat exchangers 6 are connected in parallel to the outdoor heat exchanger 4 and the hot water supply alone operation of heating hot water with the hot water supply heat exchanger 3 is performed, the control device 16 performs the following processing. Is preferable. That is, when the respective temperatures of the plurality of indoor heat exchangers 6 are all higher than the temperature of the outdoor heat exchanger 4, or when the temperatures of the air-conditioned spaces of the plurality of indoor heat exchangers 6 are all outside air, When the temperature is higher than the temperature, the control device 16 controls the compressor 1, the hot water supply heat exchanger 3, and the expansion valve 11 in a state where the valve element 82 of the four-way valve 8 is in the "second position" (see FIG. 2B). The refrigerant is circulated through the (first expansion valve) and the outdoor heat exchanger 4 sequentially. As a result, the pressure on the upper side of the valve body 82 tends to be higher than that on the lower side, and a gap is less likely to be generated between the valve body 82 and the pedestal 83 (see FIG. 2B).

In addition, when performing the hot water supply alone operation in which the hot water is heated by the hot water supply heat exchanger 3, the difference between the temperature of the indoor heat exchanger 6 and the temperature of the outdoor heat exchanger 4 is within a predetermined range. When the valve element 82 of the four-way valve 8 is in the “second position” (see FIG. 2B) before the start of the single operation (that is, at least when the heating operation has been performed immediately before), the control device 16 It is preferable to perform the following processing. That is, the control device 16 maintains the valve body 82 at the “second position”, and sequentially operates the compressor 1, the hot water supply heat exchanger 3, the expansion valve 11 (first expansion valve), and the outdoor heat exchanger 4. The refrigerant is circulated through. Thereby, it is possible to quickly switch to the hot water supply independent operation without moving the valve element 82 of the four-way valve 8.

In addition, when performing the hot water supply independent operation, the valve element 82 of the four-way valve 8 may be arranged at the “first position” (see FIG. 2A) regardless of the operation mode immediately before. In such a case, for example, in winter, when the temperature of the outside air tends to be lower than the temperature of the space to be air-conditioned, the pressure below (inside) the valve element 82 of the four-way valve 8 increases It may be slightly higher than (outside). In such a case, a gap is formed between the valve element 82 and the pedestal 83 (see FIG. 2A), and the gas refrigerant evaporated in the outdoor heat exchanger 4 is transferred to the indoor heat exchanger 6 via the gap. May leak. However, in winter, the indoor heat exchanger 6 often functions as a condenser, and the indoor heat exchanger 6 is filled with a gas refrigerant. Therefore, even if the gas refrigerant leaks somewhat into the indoor heat exchanger 6 through the gap formed in the four-way valve 8, the refrigerant pressure reaches an equilibrium state (equalized state) and the refrigerant leakage stops immediately. There is no particular problem.

Also, in the embodiment (see FIG. 1), the multi-type air-conditioning and hot-water supply device W provided with three indoor units Ui has been described, but the present invention is not limited to this. For example, the embodiment can be applied to various types of air conditioners in addition to an air conditioner (not shown) in which one indoor unit and one outdoor unit are provided.

The embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described above. Further, for a part of the configuration of the embodiment, it is possible to add, delete, or replace another configuration.
In addition, the above-described mechanisms and configurations are shown to be necessary for the description, and do not necessarily indicate all the mechanisms and configurations on the product.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Hot water storage tank 3 Heat exchanger for hot-water supply 4 Outdoor heat exchanger 5 Outdoor fan 6 Indoor heat exchanger 7 Indoor fan 8 Four-way valve 81 Main body 82 Valve body 9 Expansion valve 10 Expansion valve (first opening / closing means)
11 Expansion valve (first expansion valve)
12 Expansion valve (second expansion valve)
13 solenoid valve (second opening / closing means)
14. Solenoid valve (third opening / closing means)
15 check valve 16 control device he low pressure side connection port hf indoor side connection port hg high pressure side connection port hi outdoor side connection port kb piping (third piping)
kd piping (second piping)
ke piping (first piping)
kj piping (fourth piping)
Ui Indoor unit Uo Outdoor unit W Air conditioning hot water supply device

Claims

A compressor, a heat exchanger for hot water supply, a first expansion valve, and a refrigerant circuit in which refrigerant circulates sequentially through the outdoor heat exchanger,
A main body, and a valve body provided inside the main body, and a four-way valve that switches a flow path of a refrigerant in the refrigerant circuit,
A check valve provided in a first pipe connecting a low pressure side connection port of the four-way valve and a suction side of the compressor,
The first opening / closing means shuts off the connection between the high pressure side connection port of the four-way valve and the discharge side of the compressor,
The air-conditioning and hot-water supply device, wherein the check valve allows a flow of the refrigerant from the four-way valve to the suction side of the compressor via the first pipe and prohibits a reverse flow.
In the first pipe, the downstream side of the check valve and the outdoor heat exchanger are connected via a second pipe,
The valve body of the four-way valve is located at a first position that connects the other end of the indoor heat exchanger in which the flow of the refrigerant is blocked at one end to the first pipe. The air-conditioning and hot-water supply device according to claim 1.
A state in which the refrigerant circulates sequentially through the compressor, the heat exchanger for hot water supply, the first expansion valve, and the outdoor heat exchanger;
The outdoor heat exchanger functions as a condenser, and another state in which the indoor heat exchanger functions as an evaporator is switchable from one to the other,
The air-conditioning and hot-water supply device according to claim 2, wherein the position of the valve body of the four-way valve is maintained at the first position when switching from the one to the other.
The compressor, the hot-water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger, in which at least the cooling operation has been performed before the start of the hot-water supply alone operation in which the refrigerant is circulated through the outdoor heat exchanger, In the case where at least the heating operation has been performed before the start of the hot water supply alone operation, the position of the valve body during the hot water supply alone operation is different,
3. The air-conditioning and hot-water supply device according to claim 2, wherein at least the cooling operation is performed before the single hot-water supply operation starts when the valve element is at the first position. 4.
A second opening / closing means provided in the second pipe,
The air-conditioning and hot-water supply device according to claim 2, wherein the second opening / closing means is open.
The indoor side connection port of the four-way valve is connected to the hot water supply heat exchanger through the indoor heat exchanger and the third pipe sequentially,
A second pipe having one end connected to the outdoor heat exchanger side with respect to the second opening / closing means and a fourth pipe connected to the third pipe at the other end;
A second expansion valve provided in the third pipe near the indoor heat exchanger;
A third opening / closing means provided in the fourth pipe,
The air conditioning and hot water supply apparatus according to claim 5, wherein both the second expansion valve and the third opening / closing means are closed.
In the case of performing a hot water supply alone operation of heating hot water with the hot water supply heat exchanger,
When the temperature of the indoor heat exchanger is lower than the temperature of the outdoor heat exchanger,
Or
When the temperature of the air-conditioned space of the indoor heat exchanger is lower than the temperature of the outside air,
In a state where the valve element of the four-way valve is at the first position, the refrigerant is circulated sequentially through the compressor, the hot water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger. The air-conditioning and hot-water supply device according to claim 2, wherein:
A plurality of the indoor heat exchangers are connected in parallel to the outdoor heat exchanger,
In the case of performing a hot water supply alone operation of heating hot water with the hot water supply heat exchanger,
When there is at least one of the plurality of indoor heat exchangers whose temperature is lower than the temperature of the outdoor heat exchanger,
Or
When the air conditioning target space of each of the plurality of indoor heat exchangers has at least one whose temperature is lower than the temperature of the outside air,
In a state where the valve element of the four-way valve is at the first position, the refrigerant is circulated sequentially through the compressor, the hot water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger. The air-conditioning and hot-water supply device according to claim 2, wherein:
In a case where the hot water supply alone operation for heating hot water with the hot water supply heat exchanger is performed, a difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger is within a predetermined range, and further, the hot water supply alone operation When the valve element of the four-way valve is at the first position before the start of the operation, the valve element is maintained at the first position, and the compressor, the hot water supply heat exchanger, the first expansion The air-conditioning and hot water supply apparatus according to claim 2, wherein the refrigerant is circulated sequentially through the valve and the outdoor heat exchanger.
The air conditioning and hot water supply apparatus according to claim 1, wherein the valve body of the four-way valve is located at a second position where the outdoor heat exchanger communicates with the first pipe.
A state in which the refrigerant circulates sequentially through the compressor, the heat exchanger for hot water supply, the first expansion valve, and the outdoor heat exchanger;
The indoor heat exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator in another state, and can be switched from one to the other,
The air conditioning and hot water supply apparatus according to claim 10, wherein the position of the valve body of the four-way valve is maintained at the second position when the one is switched from the one to the other.
The compressor, the hot-water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger, in which at least the cooling operation has been performed before the start of the hot-water supply alone operation in which the refrigerant is circulated through the outdoor heat exchanger, In the case where at least the heating operation has been performed before the start of the hot water supply alone operation, the position of the valve body during the hot water supply alone operation is different,
The air-conditioning hot water supply apparatus according to claim 10, wherein at least the heating operation is performed before the hot water supply independent operation is started when the valve body is at the second position.
A second pipe that connects the downstream side of the check valve in the first pipe and the outdoor heat exchanger,
A second opening / closing means provided in the second pipe,
The said 2nd opening / closing means is opening a valve. The air conditioning hot-water supply apparatus of Claim 10 characterized by the above-mentioned.
The indoor side connection port of the four-way valve is connected to the hot water supply heat exchanger through an indoor heat exchanger and a third pipe sequentially.
A second pipe having one end connected to the outdoor heat exchanger side with respect to the second opening / closing means and a fourth pipe connected to the third pipe at the other end;
A second expansion valve provided in the third pipe near the indoor heat exchanger;
A third opening / closing means provided in the fourth pipe,
The air conditioning and hot water supply apparatus according to claim 13, wherein both the second expansion valve and the third opening / closing means are closed.
During the defrosting operation for defrosting the outdoor heat exchanger, the valve element of the four-way valve is at the second position, and the compressor, the hot water supply heat exchanger, the first expansion valve, and The refrigerant circulates sequentially through the outdoor heat exchanger, and the compressor, the first opening / closing means in the open state, the four-way valve, the indoor heat exchanger, the second expansion valve, and the outdoor heat exchanger The air-conditioning and hot-water supply device according to claim 10, wherein the refrigerant circulates sequentially through the air-conditioner.
A second expansion valve provided near one end of the indoor heat exchanger;
During the defrosting operation for defrosting the outdoor heat exchanger, the refrigerant flowing sequentially through the compressor and the hot water supply heat exchanger bypasses the first expansion valve, and further, the outdoor heat exchange Vessel, the second expansion valve, the indoor heat exchanger, the four-way valve, and circulates sequentially through the check valve,
The air-conditioning and hot-water supply device according to claim 10, wherein the valve element of the four-way valve is located at a first position where the other end of the indoor heat exchanger communicates with the first pipe. .
In the case of performing a hot water supply alone operation of heating hot water with the hot water supply heat exchanger,
When the temperature of the indoor heat exchanger is higher than the temperature of the outdoor heat exchanger,
Or
When the temperature of the air-conditioned space of the indoor heat exchanger is higher than the temperature of the outside air,
In a state where the valve element of the four-way valve is at the second position, the refrigerant is circulated sequentially through the compressor, the hot water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger. The air-conditioning and hot-water supply device according to claim 10, wherein:
A plurality of indoor heat exchangers are connected in parallel to the outdoor heat exchanger,
In the case of performing a hot water supply alone operation of heating hot water with the hot water supply heat exchanger,
When the respective temperatures of the plurality of indoor heat exchangers are all higher than the temperature of the outdoor heat exchanger,
Or
When the temperature of each air-conditioned space of each of the plurality of indoor heat exchangers is higher than the temperature of the outside air,
In a state where the valve element of the four-way valve is at the second position, the refrigerant is circulated sequentially through the compressor, the hot water supply heat exchanger, the first expansion valve, and the outdoor heat exchanger. The air-conditioning and hot-water supply device according to claim 10, wherein:
In the case of performing the hot water supply alone operation of heating hot water with the hot water supply heat exchanger, a difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger is within a predetermined range, and further, When the valve body of the four-way valve is at the second position before the start, the valve body is maintained at the second position, and the compressor, the hot water supply heat exchanger, and the first expansion valve are provided. The air-conditioning and hot-water supply device according to claim 10, wherein the refrigerant is circulated sequentially through the outdoor heat exchanger.