Heat recovery air conditioning unit and control method and device thereof

Abstract

The embodiment of the present invention discloses a heat recovery air conditioning unit and a control method and device thereof, which relates to the field of air conditioning and is used to solve the problem of low heat recovery efficiency of the heat recovery air conditioning unit. The heat recovery air conditioning unit provided by the embodiment of the present invention includes an outdoor unit, an indoor unit unit and a cold and hot switching unit, wherein the indoor unit unit includes multiple indoor units, the multiple indoor units include multiple indoor units with air-cooled indoor heat exchangers and multiple indoor units with water-cooled indoor heat exchangers, the outdoor unit includes a first solenoid valve, a second solenoid valve and at least one circulation pipeline, each circulation pipeline is provided with a four-way valve, and multiple indoor units, outdoor units and the cold and hot switching unit form a closed heat recovery circulation loop through the first solenoid valve or the second solenoid valve, and at least one circulation pipeline. The present invention is used for the heating process of the heat recovery air conditioning unit.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a heat recovery air conditioning unit and a control method and device thereof. Background Art

[0002] At present, the outdoor unit of a heat recovery air conditioner can usually be equipped with multiple indoor units with air-cooled indoor heat exchangers and multiple indoor units with water-cooled indoor heat exchangers at the same time. While the indoor unit with the air-cooled indoor heat exchanger realizes the air conditioning cooling or heating function, the indoor unit with the water-cooled indoor heat exchanger provides users with domestic hot water or floor heating functions. In actual situations, when the indoor unit with the air-cooled indoor heat exchanger and the indoor unit with the water-cooled indoor heat exchanger perform the heating function at the same time, the heat recovery air conditioner needs to meet the user's comfort requirements for air conditioning heating on the one hand, and on the other hand, it also needs to meet the user's requirements for domestic hot water or floor heating functions. However, the heat recovery air conditioner is only equipped with one indoor unit with a water-cooled indoor heat exchanger, and the heat recovery efficiency is low. It is usually difficult to meet the above two requirements at the same time, which brings many inconveniences to the user during use. Summary of the invention

[0003] The embodiments of the present invention provide a heat recovery air conditioning unit and a control method and device thereof, which are used to solve the technical problem of low heat recovery efficiency of the heat recovery air conditioning unit in the prior art.

[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0005] In a first aspect, a heat recovery air conditioning unit is provided, comprising: an outdoor unit, an indoor unit and a cold / hot switching unit; wherein:

[0006] The outdoor unit comprises at least one circulation pipeline, wherein one end of the circulation pipeline is connected to the exhaust port of the compressor, and the other end of the circulation pipeline is connected to the suction port of the compressor through a gas-liquid separator; a four-way valve and an outdoor heat exchanger are arranged on the circulation pipeline, wherein the exhaust port of the compressor is connected to the first port of the four-way valve; one end of the outdoor heat exchanger is connected to the second port of the four-way valve; the third port of the four-way valve is closed, and the fourth port of the four-way valve is connected to the suction port of the compressor through the gas-liquid separator; one end of the first solenoid valve is connected to the pipeline between the exhaust port of the compressor and the first port of the four-way valve, and one end of the second solenoid valve is connected to the pipeline between the fourth port of the four-way valve and the gas-liquid separator;

[0007] The indoor unit includes a plurality of indoor units, wherein the plurality of indoor units include a plurality of indoor units with air-cooled indoor heat exchangers and a plurality of indoor units with water-cooled indoor heat exchangers; the indoor unit includes an indoor heat exchanger, one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger;

[0008] The hot and cold switching unit includes a plurality of hot and cold switching sub-units, wherein each hot and cold switching sub-unit corresponds to an indoor unit; the hot and cold switching sub-unit includes a first switching valve and a second switching valve; the other end of the first solenoid valve and the other end of the second solenoid valve are connected to the other end of the indoor heat exchanger through the first switching valve; the other end of the indoor heat exchanger is also connected to the second port of the four-way valve and the pipeline between the gas-liquid separator through the second switching valve.

[0009] It can be seen that the heat recovery air-conditioning unit provided in the embodiment of the present invention includes: an outdoor unit, an indoor unit unit and a hot and cold switching unit, wherein the indoor unit unit may include multiple indoor units, wherein the multiple indoor units include multiple indoor units with air-cooled indoor heat exchangers and multiple indoor units with water-cooled indoor heat exchangers, the indoor unit includes an indoor heat exchanger, and the outdoor unit includes at least one circulation pipeline, wherein one end of the circulation pipeline is connected to the exhaust port of the compressor, and the other end of the circulation pipeline is connected to the suction port of the compressor through a gas-liquid separator; a four-way valve and an outdoor heat exchanger are arranged on the circulation pipeline, wherein the exhaust port of the compressor is connected to the first port of the four-way valve; one end of the outdoor heat exchanger is connected to the second port of the four-way valve; the third port of the four-way valve is closed , the fourth port of the four-way valve is connected to the suction port of the compressor through the gas-liquid separator; one end of the first solenoid valve is connected to the pipeline between the exhaust port of the compressor and the first port of the four-way valve, and one end of the second solenoid valve is connected to the pipeline between the fourth port of the four-way valve and the gas-liquid separator; one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger; the hot and cold switching unit includes a plurality of hot and cold switching sub-units, each of which corresponds to an indoor unit; the hot and cold switching sub-unit includes a first switching valve and a second switching valve; the other end of the first solenoid valve and the other end of the second solenoid valve are connected to the other end of the indoor heat exchanger through the first switching valve; the other end of the indoor heat exchanger is also connected to the pipeline between the second port of the four-way valve and the gas-liquid separator through the second switching valve. The outdoor unit provided in the embodiment of the present invention can be equipped with multiple indoor units with water-cooled indoor heat exchangers, so as to control the heat recovery air-conditioning unit to operate in different working modes through the first switching valve and the second switching valve arranged on the cold and hot switching unit, and the first four-way valve, the second four-way valve, the first solenoid valve and the second solenoid valve arranged on the outdoor unit, so as to effectively improve the heat recovery efficiency while realizing multiple working modes, meet the user's comfort needs for air-conditioning heating, and meet the user's needs for domestic hot water or provide floor heating functions, bringing many conveniences to the user during use.

[0010] In a second aspect, a control method for a heat recovery air conditioner of a heat recovery air conditioner unit is provided, comprising:

[0011] The first port of the four-way valve is controlled to be connected with the second port, the third port of the four-way valve is controlled to be connected with the fourth port, the first solenoid valve is controlled to be closed and the second solenoid valve is controlled to be opened, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be opened, and the heat recovery air conditioning unit enters the first working mode;

[0012] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be closed, and the heat recovery air conditioning unit enters the second working mode;

[0013] Alternatively, the first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air conditioning unit enters the third working mode;

[0014] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air-conditioning unit enters the fourth working mode.

[0015] In a third aspect, a control device for a heat recovery air conditioning unit is provided, comprising: a working mode control module, configured to:

[0016] The first port of the four-way valve is controlled to be connected with the second port, the third port of the four-way valve is controlled to be connected with the fourth port, the first solenoid valve is controlled to be closed and the second solenoid valve is controlled to be opened, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be opened, and the heat recovery air conditioning unit enters the first working mode;

[0017] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be closed, and the heat recovery air conditioning unit enters the second working mode;

[0018] Alternatively, the first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air conditioning unit enters the third working mode;

[0019] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air-conditioning unit enters the fourth working mode.

[0020] In a fourth aspect, a control device for a heat recovery air-conditioning unit is provided, the control device for the heat recovery air-conditioning unit comprising: a communication interface and a processor, the communication interface being coupled to the processor, and when the control device for the heat recovery air-conditioning unit is running, the processor executes a computer program or instruction so that the control device for the heat recovery air-conditioning unit executes the method of the second aspect.

[0021] In a fifth aspect, a storage medium is provided, wherein the storage medium stores instructions for executing a heat recovery air conditioning unit control method of the heat recovery air conditioning unit as in the second aspect.

[0022] In a sixth aspect, a computer program product is provided, the computer program product comprising instructions for executing a method for controlling a heat recovery air conditioning unit of the heat recovery air conditioning unit of the second aspect.

[0023] It can be understood that the heat recovery air-conditioning unit control method and device of the heat recovery air-conditioning unit provided above are all applied to the heat recovery air-conditioning unit of the first aspect provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding scheme in the first aspect above and the specific implementation method below, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and the drawings are only used to illustrate the preferred implementation methods and are not considered to be limitations of the present invention.

[0025] Figure 1 A schematic diagram of the structure of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a working mode of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of another working mode of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of another working mode of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of another working mode of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of another working mode of a heat recovery air conditioning unit provided by an embodiment of the present invention;

[0032] Figure 8 A method flow chart of a heat recovery air conditioning unit control method provided by an embodiment of the present invention;

[0033] Fig. 9 A method flow chart of a heat recovery air conditioning unit control method provided by an embodiment of the present invention;

[0034] Fig.10 A method flow chart of a heat recovery air conditioning unit control method provided by an embodiment of the present invention;

[0035] Fig.11 A functional structure block diagram of a heat recovery air conditioning unit control device provided by an embodiment of the present invention;

[0036] Fig.12 A functional structure block diagram of a heat recovery air conditioning unit control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. The use of the terms "first" and "second" and the like does not indicate any order, and the above terms can be interpreted as the names of the described objects. In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0038] Before introducing the embodiments of the present invention, a brief introduction to the current heat recovery air conditioning unit is first given. At present, the outdoor unit in the heat recovery air conditioning unit can be equipped with one or more indoor units with air-cooled indoor heat exchangers at the same time, or the outdoor unit in the heat recovery air conditioning unit can be equipped with one or more indoor units with water-cooled indoor heat exchangers at the same time, or the outdoor unit in the heat recovery air conditioning unit can be equipped with one or more indoor units with air-cooled indoor heat exchangers and one or more indoor units with water-cooled indoor heat exchangers at the same time. Among them, the heat recovery air conditioning unit can realize the air conditioning cooling function or the air conditioning heating function through the indoor unit with the air-cooled indoor heat exchanger, and provide users with domestic hot water or floor heating function through the indoor unit with the water-cooled indoor heat exchanger. In actual situations, when the outdoor unit of a heat recovery air-conditioning unit is equipped with multiple indoor units with air-cooled indoor heat exchangers and multiple indoor units with water-cooled indoor heat exchangers at the same time, and all indoor units execute the heating mode at the same time (the indoor units with air-cooled indoor heat exchangers execute the heating mode, i.e., realize the air-conditioning heating function, and the indoor units with water-cooled indoor heat exchangers execute the heating mode, i.e., provide users with domestic hot water or provide floor heating function), the heat recovery air-conditioning unit is usually difficult to simultaneously meet the user's comfort needs for air-conditioning heating and the user's needs for domestic hot water or providing floor heating functions. For example, the domestic hot water provided by the heat recovery air-conditioning unit to the user meets the user's needs, but the air-conditioning heating effect of the heat recovery air-conditioning unit will deteriorate, or the air-conditioning heating effect of the heat recovery air-conditioning unit can meet the user's needs, but the temperature of the domestic water cannot reach the water temperature set by the user or the floor heating effect deteriorates, etc. The heat recovery efficiency is low, which brings many inconveniences to the user during use and seriously damages the user experience.

[0039] Based on the above problems, the present invention provides a heat recovery air conditioning unit. Figure 1As shown, the heat recovery air conditioning unit 100 includes: an outdoor unit 101, an indoor unit 102 and a cold and hot switching unit 103.

[0040] The outdoor unit 101 includes at least one circulation pipeline, wherein one end of the circulation pipeline is connected to the exhaust port of the compressor 1011 (not shown in the figure), and the other end of the circulation pipeline is connected to the suction port of the compressor 1011 (not shown in the figure) through the gas-liquid separator 1012; a four-way valve 1013 and an outdoor heat exchanger 1014 are arranged on the circulation pipeline, wherein the exhaust port of the compressor 1011 is connected to the first port of the four-way valve 1013 (not shown in the figure); one end of the outdoor heat exchanger 1014 is connected to the second port of the four-way valve (not shown in the figure); the third port of the four-way valve 1013 (not shown in the figure) is closed, and the fourth port of the four-way valve 1014 (not shown in the figure) is connected to the suction port of the compressor through the gas-liquid separator; one end of the first solenoid valve 1015 is connected to the pipeline between the exhaust port of the compressor and the first port of the four-way valve, and one end of the second solenoid valve is connected to the pipeline between the fourth port of the four-way valve and the gas-liquid separator. It can be understood that Figure 1 Only three circulation pipelines are shown as examples. In a specific implementation, the above-mentioned circulation pipeline can be one or more.

[0041] The indoor unit unit 102 includes multiple indoor units (not shown in the figure), including multiple indoor units with air-cooled indoor heat exchangers and multiple indoor units with water-cooled indoor heat exchangers; wherein the indoor unit includes an indoor heat exchanger 1017, one end of the indoor heat exchanger 1017 is connected to the other end of the outdoor heat exchanger 1014.

[0042] The hot and cold switching unit 103 includes a plurality of hot and cold switching sub-units 1031, wherein each hot and cold switching sub-unit corresponds to an indoor unit; the hot and cold switching sub-unit 1031 includes a first switching valve 1032 and a second switching valve 1033; the other end of the first solenoid valve 1015 and the other end of the second solenoid valve 1016 are connected to the other end of the indoor heat exchanger 1017 through the first switching valve 1032; the other end of the indoor heat exchanger 1017 is also connected to the pipeline between the second port of the four-way valve 1013 and the gas-liquid separator 1012 through the second switching valve 1033.

[0043] Among them, one end of the indoor heat exchanger can be connected to the other end of the outdoor heat exchanger through a first valve; at the same time, the other end of the outdoor heat exchanger is connected to the first valve through a second valve.

[0044] Furthermore, the indoor unit with a water-cooled indoor heat exchanger includes a water inlet, a water outlet, a first liquid inlet interface and a first liquid outlet interface, and the heat recovery air-conditioning unit may also include: a water inlet temperature sensor close to the water inlet, so as to obtain the water inlet temperature of the water-cooled indoor heat exchanger; and, a water outlet temperature sensor close to the water outlet, so as to obtain the water outlet temperature of the water-cooled indoor heat exchanger; and, a first liquid inlet interface temperature sensor close to the first liquid inlet interface, so as to obtain the liquid inlet temperature of the water-cooled indoor heat exchanger (i.e., the temperature of the refrigerant flowing through the first liquid inlet interface); and, a first liquid outlet interface temperature sensor close to the first liquid inlet interface, so as to obtain the liquid outlet temperature of the water-cooled indoor heat exchanger (i.e., the temperature of the refrigerant flowing through the first liquid outlet interface). The indoor unit with an air-cooled indoor heat exchanger includes a fan, a second liquid inlet interface and a second liquid outlet interface, and the heat recovery air-conditioning unit also includes: a return air temperature sensor close to the fan to obtain the return air temperature of the air-cooled indoor heat exchanger; and, a second liquid inlet interface temperature sensor close to the second liquid inlet interface to obtain the inlet temperature of the air-cooled indoor heat exchanger (i.e., the temperature of the refrigerant flowing through the second liquid inlet interface); and, a second liquid outlet interface temperature sensor close to the second liquid outlet interface to obtain the outlet temperature of the air-cooled indoor heat exchanger (i.e., the temperature of the refrigerant flowing through the second liquid outlet interface).

[0045] Furthermore, the outdoor heat exchanger includes a gas pipe interface and a liquid pipe interface. A gas pipe temperature sensor is arranged near the gas pipe interface, and a liquid pipe temperature sensor is arranged near the liquid pipe interface. The gas pipe temperature sensor is used to obtain the temperature of the refrigerant flowing through the gas pipe, and the liquid pipe temperature sensor is used to obtain the temperature of the refrigerant flowing through the liquid pipe, so as to facilitate research and analysis by relevant staff.

[0046] In the specific implementation, it is taken as an example that two indoor units with air-cooled indoor heat exchangers and two indoor units with water-cooled indoor heat exchangers are set in the indoor unit unit, see Figure 2As shown, it includes: an outdoor unit 110, an indoor unit 120 and a cold and hot switching unit 130. Among them, the outdoor unit 110 includes: 1-compressor, 2-oil separator, 3-first outdoor unit filter, 4-return oil capillary, 5-gas-liquid separator, 6-check valve, 7-high pressure sensor, 8-second outdoor unit filter, 9-low pressure sensor, 10-first outdoor heat exchanger, 11-first outdoor unit fan, 12-first outdoor unit electronic expansion valve, 13-second outdoor heat exchanger, 14-second outdoor unit fan, 15-second outdoor unit electronic expansion valve, 16-first solenoid valve, 17-second solenoid valve, 18-first four-way valve, 19-second four-way valve The indoor unit 120 includes: 20-a first indoor unit, 21-a first indoor unit filter, 22-a first air-cooling valve, 23-a first air-cooled indoor heat exchanger, 24-a first indoor unit fan, 25-a second indoor unit, 26-a second indoor unit filter, 27-a second air-cooling valve, 28-a second air-cooled indoor heat exchanger, 29-a second indoor unit fan, 30-a first water-cooled indoor heat exchanger, 31-a third indoor unit filter, 32-a first water-cooling valve, 33-a first water-cooled indoor heat exchanger, 34-a first water machine filter, 35-a first water pump, 36-a first indoor unit filter, 37-a second indoor unit filter, 38-a second indoor unit filter, 39-a first indoor unit filter, 40-a first indoor unit filter, 41-a first indoor unit filter, 42-a first indoor unit filter, 43-a first indoor unit filter, 44-a first indoor unit filter, 45-a first indoor unit filter, 46-a first indoor unit filter, 47-a first indoor unit filter, 48-a first indoor unit filter, 49-a first indoor unit filter, 50-a first indoor unit filter, 51-a first indoor unit filter, 52-a first indoor unit filter, 53-a first indoor unit filter, 54-a first indoor unit filter, 55-a first indoor unit filter, 56-a first indoor unit filter, 57-a first indoor unit filter, 58-a first indoor unit filter, 59-a first indoor unit filter, 60-a first indoor unit filter, 61-a first indoor unit filter, 62-a first indoor unit filter, 63-a first indoor unit filter, 64-a first indoor unit filter, 65-a first indoor unit filter, 66-a first indoor unit filter, 67-a second indoor unit filter The second water-cooled indoor heat exchanger, 37-the fourth indoor unit filter, 38-the second water-cooled valve, 39-the second water-cooled indoor heat exchanger, 40-the second water machine filter, 41-the second water pump; the hot and cold switching unit 130 includes: 4 hot and cold switching subunits (corresponding to the first air-cooled indoor heat exchanger, the second air-cooled indoor heat exchanger, the first water-cooled indoor heat exchanger, and the second water-cooled indoor heat exchanger), respectively, the first hot and cold switching subunit 131, the second hot and cold switching subunit 132, the third hot and cold switching subunit 133 and the fourth hot and cold switching subunit 134, wherein The first cold and hot switching subunit 131 includes a first cold and hot switching subunit first switching valve 42 and a first cold and hot switching subunit second switching valve 43, the second cold and hot switching subunit 132 includes a second cold and hot switching subunit first switching valve 44 and a second cold and hot switching subunit second switching valve 45, the third cold and hot switching subunit 133 includes a third cold and hot switching subunit first switching valve 46 and a third cold and hot switching subunit second switching valve 47, and the fourth cold and hot switching subunit 134 includes a fourth cold and hot switching subunit first switching valve 48 and a fourth cold and hot switching subunit second switching valve 49. The first valve includes: a first air-cooling valve 22, a second air-cooling valve 27, a first water-cooling valve 32, and a second water-cooling valve 38; the second valve includes: a first outdoor unit electronic expansion valve 12, and a second outdoor unit electronic expansion valve 15.

[0047] Specifically, the connection relationship of the above-mentioned parts is described as follows:

[0048] The compressor 1 includes an air intake port and an air exhaust port, the oil separator 2 includes an oil separator air inlet port and an oil separator air outlet port, the air exhaust port of the compressor 1 is connected to the oil separator air inlet port of the oil separator 2, and the oil separator air outlet port of the oil separator 2 is connected to the first four-way valve 18 and the second four-way valve 19. Among them, the first port of the first four-way valve 18 corresponds to Figure 2 The second port of the first four-way valve 18 corresponds to the D interface. Figure 2 The third port of the first four-way valve 18 corresponds to the C interface. Figure 2 The fourth port of the first four-way valve 18 corresponds to the E interface. Figure 2 Similarly, the first port of the second four-way valve 19 corresponds to Figure 2 The second port of the second four-way valve 19 corresponds to the D interface Figure 2 The third port of the second four-way valve 19 corresponds to the C interface Figure 2 The fourth port of the second four-way valve 19 corresponds to the middle E interface. Figure 2 S interface. Among them, Figure 2 The communication mode of the first four-way valve 18 shown is that the S interface of the first four-way valve 18 is connected to the E interface of the first four-way valve 18, and the C interface of the first four-way valve 18 is connected to the D interface of the first four-way valve 18. In a specific implementation, the communication mode of the first four-way valve 18 also includes: the S interface of the first four-way valve 18 is connected to the C interface of the first four-way valve 18, and the E interface of the first four-way valve 18 is connected to the D interface of the first four-way valve 18; Figure 2The connection mode of the second four-way valve 19 shown is that the S interface of the second four-way valve 19 is connected with the E interface of the second four-way valve 19, and the C interface of the second four-way valve 19 is connected with the D interface of the second four-way valve 19. In a specific implementation, the connection mode of the second four-way valve 19 also includes: the S interface of the second four-way valve 19 is connected with the C interface of the second four-way valve 19, and the E interface of the second four-way valve 19 is connected with the D interface of the second four-way valve 19. After the D interface of the first four-way valve 18 is connected in parallel with the D interface of the second four-way valve 19, it is connected to the exhaust port of the compressor 1 through the one-way valve 6 and the oil separator of the oil separator 2 in turn. A high-pressure pressure sensor 7 is arranged on the pipeline between the one-way valve 6 and the parallel D interface of the first four-way valve 18 and the D interface of the second four-way valve 19. At the same time, one end of the first solenoid valve 16 is connected to the pipeline between the exhaust port of the compressor and the first port of the four-way valve (the D interface of the first four-way valve 18 and the D interface of the second four-way valve 19 after being connected in parallel); after the S interface of the first four-way valve 18 and the S interface of the second four-way valve 19 are connected in parallel, they are connected to the suction port of the gas-liquid separator 5 through the second outdoor unit filter 8, and a low-pressure pressure sensor 9 is arranged on the pipeline between the suction port of the gas-liquid separator 5 and the second outdoor unit filter 8; wherein, an oil return capillary 4 is arranged between the oil separator 2 and the gas-liquid separator 5, and a first outdoor unit filter 3 is arranged between the oil return capillary 4 and the oil separator 2. The C interface of the first four-way valve 18 is connected to the gas pipe interface of the first outdoor heat exchanger 10, the C interface of the second four-way valve 19 is connected to the gas pipe interface of the second outdoor heat exchanger 13, and the liquid pipe interface of the first outdoor heat exchanger 10 and the liquid pipe interface of the second outdoor heat exchanger 13 are connected in parallel and then connected to the indoor unit 120. In the indoor unit 120, the first indoor unit 20, the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​connected in parallel are connected to the liquid pipe interface of the first outdoor heat exchanger 10 and the liquid pipe interface of the second outdoor heat exchanger 13 connected in parallel.Among them, in the first indoor unit 20, one end of the first indoor unit filter 21 is connected to the first outdoor heat exchanger 10 and the second outdoor heat exchanger 13 in parallel, and the other end of the first indoor unit filter 21 is connected to one end of the first air-cooled indoor heat exchanger 23 through the first air-cooled valve 22; the other end of the first air-cooled indoor heat exchanger 23 is connected to the first cold and hot switching subunit 131 in the cold and hot switching unit 130; in the second indoor unit 25, one end of the second indoor unit filter 26 is connected to the first outdoor heat exchanger 10 and the second outdoor heat exchanger 13 in parallel. , the other end of the second indoor unit filter 26 is connected to one end of the second air-cooled indoor heat exchanger 28 through the second air-cooled valve 27; the other end of the second air-cooled indoor heat exchanger 28 is connected to the second cold-heat switching subunit 132 in the cold-heat switching unit 130; in the third indoor unit 30, one end of the third indoor unit filter 31 is connected to the first outdoor heat exchanger 10 and the second outdoor heat exchanger 13 connected in parallel, and the other end of the third indoor unit filter 31 is connected to one end of the first water-cooled indoor heat exchanger 33 through the first water-cooled valve 32. The other end of the indoor heat exchanger 33 is connected to the third hot and cold switching subunit 133 in the hot and cold switching unit 130, wherein water flows into the first water-cooled indoor heat exchanger 33 from the water inlet end of the first water-cooled indoor heat exchanger 33 after passing through the first water pump 35 and the first water machine filter 34 in sequence, and flows out from the water outlet end of the first water-cooled indoor heat exchanger 33 after heat exchange with the refrigerant flowing through the first water-cooled indoor heat exchanger 33; in the fourth indoor unit 36, one end of the fourth indoor unit filter 37 is connected to the first outdoor heat exchanger 10 and the second outdoor heat exchanger 13, and the fourth The other end of the indoor unit filter 37 is connected to one end of the second water-cooled indoor heat exchanger 39 through the second water-cooled valve 38, and the other end of the second water-cooled indoor heat exchanger 39 is connected to the fourth cold and hot switching subunit 134 in the cold and hot switching unit 130, wherein water passes through the second water pump 41 and the fourth indoor unit filter 40 in sequence, flows into the second water-cooled indoor heat exchanger 39 from the water inlet end of the second water-cooled indoor heat exchanger 39, and flows out from the water outlet end of the second water-cooled indoor heat exchanger 39 after heat exchange with the refrigerant flowing through the second water-cooled indoor heat exchanger 39.

[0049] In the hot and cold switching unit 130, one end of the first switching valve 42 of the first hot and cold switching subunit 131 is connected to the other end of the first air-cooled indoor heat exchanger 23, and one end of the second switching valve 43 of the first hot and cold switching subunit 131 is connected to the other end of the first air-cooled indoor heat exchanger 23; one end of the first switching valve 44 of the second hot and cold switching subunit 132 is connected to the other end of the second air-cooled indoor heat exchanger 28, and one end of the second switching valve 45 of the second hot and cold switching subunit 132 is connected to the second end of the second air-cooled indoor heat exchanger 28. The other end of the first switching valve 42 of the first cold and heat switching subunit is connected to the other end of the first water-cooled indoor heat exchanger 33; one end of the first switching valve 46 of the third cold and heat switching subunit in the third cold and heat switching subunit 133 is connected to the other end of the first water-cooled indoor heat exchanger 33, and one end of the second switching valve 47 of the third cold and heat switching subunit in the third cold and heat switching subunit 133 is connected to the other end of the first water-cooled indoor heat exchanger 33; one end of the first switching valve 48 of the fourth cold and heat switching subunit in the fourth cold and heat switching subunit 134 is connected to the other end of the second water-cooled indoor heat exchanger 39, and one end of the second switching valve 49 of the fourth cold and heat switching subunit in the fourth cold and heat switching subunit 134 is connected to the other end of the second water-cooled indoor heat exchanger 39. The other end of the first switching valve 42 of the first cold and heat switching subunit, the other end of the first switching valve 44 of the second cold and heat switching subunit, the other end of the first switching valve 46 of the third cold and heat switching subunit, and the other end of the first switching valve 48 of the fourth cold and heat switching subunit are connected in parallel and are respectively connected to the other end of the first solenoid valve 16 and the other end of the second solenoid valve 17. Among them, the first switching valve 42 of the first cold and hot switching subunit, the first switching valve 44 of the second cold and hot switching subunit, the first switching valve 46 of the third cold and hot switching subunit, and the first switching valve 48 of the fourth cold and hot switching subunit are connected in parallel through the first solenoid valve 16 and the D interface of the first four-way valve 18 and the D interface of the second four-way valve 19. The first switching valve 42 of the first cold and hot switching subunit, the first switching valve 44 of the second cold and hot switching subunit, the first switching valve 46 of the third cold and hot switching subunit, and the fourth cold and hot switching subunit After being connected in parallel, the first switching valve 48 is connected to the S interface of the first four-way valve 18, the S interface of the second four-way valve 19, and the air intake port of the gas-liquid separator 5 through the second solenoid valve 17; the second switching valve 43 of the first cold and hot switching subunit, the second switching valve 45 of the second cold and hot switching subunit, the second switching valve 47 of the third cold and hot switching subunit, and the second switching valve 49 of the fourth cold and hot switching subunit are connected in parallel, respectively, and are connected to the S interface of the first four-way valve 18, the S interface of the second four-way valve 19, and the air intake port of the gas-liquid separator 5.

[0050] Also, see Figure 2As shown, a temperature sensor Til1 (i.e., a second liquid inlet interface temperature sensor) can be provided near the liquid inlet interface (i.e., the second liquid inlet interface) of the first air-cooled indoor heat exchanger 23, a temperature sensor Tig1 (i.e., a second liquid outlet interface temperature sensor) can be provided near the liquid outlet interface (i.e., the second liquid outlet interface) of the first air-cooled indoor heat exchanger 23, and a temperature sensor Ti1 (i.e., a return air temperature sensor) can be provided on the fan of the first indoor unit fan 24; the temperature sensor Til1 is used to obtain the liquid inlet temperature of the first air-cooled indoor heat exchanger 23 (i.e., the temperature of the refrigerant flowing through the liquid inlet interface of the first air-cooled indoor heat exchanger 23), and the temperature sensor T ig1 is used to obtain the outlet liquid temperature of the first air-cooled indoor heat exchanger 23 (i.e., the temperature of the refrigerant flowing through the liquid outlet interface of the first air-cooled indoor heat exchanger 23), and the return air temperature sensor Ti1 is used to obtain the return air temperature of the first indoor unit fan 24; similarly, a temperature sensor Til2 (i.e., the second liquid inlet interface temperature sensor) can be set near the liquid inlet interface (i.e., the second liquid inlet interface) of the second air-cooled indoor heat exchanger 28, a temperature sensor Tig2 (i.e., the second liquid outlet interface temperature sensor) can be set near the liquid outlet interface (i.e., the second liquid outlet interface) of the second air-cooled indoor heat exchanger 28, and a temperature sensor can be set on the fan of the second indoor unit fan 29. Sensor Ti2 (i.e., return air temperature sensor); wherein, the temperature sensor Til2 is used to obtain the second liquid inlet interface temperature of the second air-cooled indoor heat exchanger 28 (i.e., the temperature of the refrigerant flowing through the liquid inlet interface of the second air-cooled indoor heat exchanger 28), the temperature sensor Tig2 is used to obtain the second liquid outlet interface temperature of the second air-cooled indoor heat exchanger 28 (i.e., the temperature of the refrigerant flowing through the liquid outlet interface of the second air-cooled indoor heat exchanger 28), the temperature sensor Ti2 is used to obtain the return air temperature of the first indoor unit fan 24; a temperature sensor Twi1 (i.e., water inlet temperature sensor) can be set near the water inlet of the first water-cooled indoor heat exchanger 33, the first water-cooled indoor A temperature sensor Two1 (i.e., a water outlet temperature sensor) may be provided near the water outlet of the heat exchanger 33, a temperature sensor Twl1 (i.e., a first liquid inlet temperature sensor) may be provided near the liquid inlet interface (i.e., a first liquid inlet interface) of the first water-cooled indoor heat exchanger 33, and a temperature sensor Twg1 (i.e., a first liquid outlet temperature sensor) may be provided near the liquid outlet interface (i.e., a first liquid outlet interface) of the first water-cooled indoor heat exchanger 33, wherein the temperature sensor Twi1 may be used to obtain the water inlet temperature of the first water-cooled indoor heat exchanger 33, and the temperature sensor Two1 may be used to obtain the water outlet temperature of the first water-cooled indoor heat exchanger 33;The temperature sensor Twl1 is used to obtain the liquid inlet temperature of the first water-cooled indoor heat exchanger 33 (i.e., the temperature of the refrigerant flowing through the liquid inlet interface of the first water-cooled indoor heat exchanger 33), and the temperature sensor Twg1 is used to obtain the liquid outlet temperature of the first water-cooled indoor heat exchanger 33 (i.e., the temperature of the refrigerant flowing through the liquid outlet interface of the first water-cooled indoor heat exchanger 33); a temperature sensor Twi2 (i.e., the first water inlet temperature sensor) can be set near the water inlet of the second water-cooled indoor heat exchanger 39, and a temperature sensor Twi3 (i.e., the first water inlet temperature sensor) can be set near the water outlet of the second water-cooled indoor heat exchanger 39. A temperature sensor Two2 (i.e., a first water outlet temperature sensor) can be provided near the liquid inlet interface (i.e., the first liquid inlet interface) of the second water-cooled indoor heat exchanger 39, and a temperature sensor Twl2 (i.e., a first liquid inlet interface temperature sensor) can be provided near the liquid outlet interface (i.e., the first liquid outlet interface) of the second water-cooled indoor heat exchanger 39. A temperature sensor Twg2 (i.e., a first liquid outlet interface temperature sensor) can be provided near the liquid outlet interface (i.e., the first liquid outlet interface) of the second water-cooled indoor heat exchanger 39. The temperature sensor Twi2 can be used to obtain the inlet water temperature of the second water-cooled indoor heat exchanger 39. The temperature sensor Two2 can be used The temperature sensor Twl2 is used to obtain the first liquid inlet interface temperature of the second water-cooled indoor heat exchanger 39 (i.e., the temperature of the refrigerant flowing through the liquid inlet interface of the second water-cooled indoor heat exchanger 39), and the temperature sensor Twg2 is used to obtain the first liquid outlet interface temperature of the second water-cooled indoor heat exchanger 39 (i.e., the temperature of the refrigerant flowing through the liquid outlet interface of the second water-cooled indoor heat exchanger 39); a temperature sensor Tg1 can be provided on the pipeline between the first four-way valve and the first outdoor heat exchanger to obtain the first The refrigerant temperature on the pipeline between the four-way valve and the first outdoor heat exchanger; a temperature sensor Tg2 can be set on the pipeline between the second four-way valve and the second outdoor heat exchanger to obtain the refrigerant temperature on the pipeline between the second four-way valve and the second outdoor heat exchanger; a temperature sensor Te1 can be set near the liquid pipe interface of the first outdoor heat exchanger to obtain the refrigerant temperature of the liquid pipe interface of the first outdoor heat exchanger; a temperature sensor Te2 can be set near the liquid pipe interface of the second outdoor heat exchanger to obtain the refrigerant temperature of the liquid pipe interface of the second outdoor heat exchanger. In a specific implementation, the water-cooled indoor heat exchanger can be a plate heat exchanger, and the air-cooled indoor heat exchanger can be a fan-tube heat exchanger. ;

[0051] The heat recovery air conditioning unit provided in the embodiment of the present invention can operate in various working modes through the following control method. The control and operation process of the above working modes are introduced in detail below.

[0052] Specifically, in one working mode, the first port of the four-way valve can be controlled to be connected to the second port, the third port of the four-way valve can be controlled to be connected to the fourth port, the first solenoid valve can be controlled to be closed and the second solenoid valve can be controlled to be opened, the first switching valves of all the hot and cold switching subunits can be controlled to be opened and the second switching valves of all the hot and cold switching subunits can be controlled to be opened, and the heat recovery air-conditioning unit enters the first working mode, at which time the heat recovery air-conditioning unit can realize the refrigeration cycle.

[0053] Below Figure 2 Taking the heat recovery air conditioning unit shown in FIG. 1 as an example, the first working mode is described in detail. Figure 3 As shown ( Figure 3The direction of the arrow in the middle is the refrigerant flow direction), the first solenoid valve 16 is closed, the second solenoid valve 17 is opened, the D interface of the first four-way valve 18 is connected to the C interface, and the E interface of the first four-way valve 18 is connected to the S interface, the D interface of the second four-way valve 19 is connected to the C interface, and the E interface of the second four-way valve 19 is connected to the S interface, the first switching valve and the second switching valve in the hot and cold switching unit 130 are both opened (that is, the first switching valve 42 of the first hot and cold switching subunit, the second switching valve 43 of the first hot and cold switching subunit, the first switching valve 44 of the second hot and cold switching subunit, the second switching valve 45 of the second hot and cold switching subunit, the first switching valve 46 of the third hot and cold switching subunit, the second switching valve 47 of the third hot and cold switching subunit, the first switching valve 48 of the fourth hot and cold switching subunit, and the second switching valve 49 of the fourth hot and cold switching subunit are all opened), at this time, the working mode of the heat recovery air-conditioning unit is as follows: the exhaust port of the compressor 1 outputs The high-temperature and high-pressure gaseous refrigerant passes through the oil separator 2 and the one-way valve 6 in sequence, and then one path is output to the gas pipe interface of the first outdoor heat exchanger 10 through the D interface of the first four-way valve 18 and the C interface of the first four-way valve 18 in sequence, and the other path is output to the gas pipe interface of the second outdoor heat exchanger 13 through the D interface of the second four-way valve 19 and the C interface of the second four-way valve 19 in sequence; the liquid pipe interface of the first outdoor heat exchanger 10 outputs the condensed high-temperature and high-pressure liquid refrigerant to the first outdoor unit electronic expansion valve 12, and at the same time, the liquid pipe interface of the second outdoor heat exchanger 13 outputs the condensed high-temperature and high-pressure liquid refrigerant to the second outdoor unit electronic expansion valve 15. The high-temperature and high-pressure liquid refrigerant passing through the first outdoor unit electronic expansion valve 12 and the high-temperature and high-pressure liquid refrigerant passing through the second outdoor unit electronic expansion valve 15 merge and flow into the first indoor unit 20, the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​respectively.Among them, in the first indoor unit 20, the high-temperature and high-pressure liquid refrigerant is filtered by the first indoor unit filter 21 and then flows into the first air-cooling valve 22. After being throttled by the first air-cooling valve 22 (i.e., reducing the cross-sectional area of ​​the refrigerant flowing through the channel), it is condensed into a low-temperature and low-pressure liquid refrigerant and then flows into the first air-cooled indoor heat exchanger 23. The first air-cooled indoor heat exchanger 23 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the first switching valve 42 of the first hot and cold switching subunit and the second switching valve 43 of the first hot and cold switching subunit; similarly, in the second indoor unit 25, the high-temperature and high-pressure liquid refrigerant is filtered by the second indoor unit filter 26 and then flows into the second air-cooling valve 27. After being throttled by the second air-cooling valve 27 and condensed into a low-temperature and low-pressure liquid refrigerant, it flows into the second air-cooled indoor heat exchanger 28. The second air-cooled indoor heat exchanger 28 outputs the evaporated low-temperature and low-pressure gaseous refrigerant. The liquid refrigerant flows into the first switching valve 44 of the second cold and hot switching subunit and the second switching valve 45 of the second cold and hot switching subunit; in the third indoor unit 30, the high-temperature and high-pressure liquid refrigerant is filtered by the third indoor unit filter 31 and then flows into the first water-cooled valve 32, and then flows into the first water-cooled indoor heat exchanger 33 after being throttled and condensed into low-temperature and low-pressure liquid refrigerant by the first water-cooled valve 32. The first water-cooled indoor heat exchanger 33 outputs the gaseous refrigerant evaporated into low-temperature and low-pressure to the first switching valve 46 of the third cold and hot switching subunit and the second switching valve 47 of the third cold and hot switching subunit, wherein water flows into the first water-cooled indoor heat exchanger 33 through the first water pump 35 and the first water machine filter 34 in turn, and is output by the first water-cooled indoor heat exchanger 33 to the user's water use terminal (after heat exchange with the low-temperature and low-pressure liquid refrigerant flowing through the first water-cooled indoor heat exchanger 33. Figure 3 (not shown); in the fourth indoor unit 36, the high-temperature and high-pressure liquid refrigerant is filtered by the fourth indoor unit filter 37 and then flows into the second water-cooled valve 38, and then flows into the second water-cooled indoor heat exchanger 39 after being throttled and condensed into a low-temperature and low-pressure liquid refrigerant by the second water-cooled valve 38. The second water-cooled indoor heat exchanger 39 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the fourth cold and hot switching subunit first switching valve 48 and the fourth cold and hot switching subunit second switching valve 49, wherein water flows into the second water-cooled indoor heat exchanger 39 through the second water pump 41 and the second water machine filter 40 in turn, and is output by the second water-cooled indoor heat exchanger 39 to the user's water terminal after heat exchange with the low-temperature and low-pressure liquid refrigerant flowing through the second water-cooled indoor heat exchanger 39 ( Figure 3 By each first switching valve (i.e. Figure 2The low-temperature and low-pressure gaseous refrigerant of the first switching valve 42 of the first cold-heat switching subunit, the first switching valve 44 of the second cold-heat switching subunit, the first switching valve 46 of the third cold-heat switching subunit, and the first switching valve 48 of the fourth cold-heat switching subunit) shown in the figure merges and flows into the first solenoid valve 16 and the second solenoid valve 17, wherein the first solenoid valve 16 is closed, and the low-temperature and low-pressure gaseous refrigerant is stopped when it flows to the first solenoid valve 16; the second solenoid valve 17 is opened, and the low-temperature and low-pressure gaseous refrigerant passes through the second solenoid valve 17, and then passes through the S interface of the first four-way valve 18 and the E interface of the first four-way valve 18 in sequence, and then flows out from the E interface of the first four-way valve 18, and the other way passes through the S interface of the second four-way valve 19 and the E interface of the second four-way valve 19, and then flows out from the E interface of the second four-way valve 19, and then passes through the second outdoor unit filter 8 to filter and flows into the suction port of the gas-liquid separator 5; at the same time, the gaseous refrigerant passes through each second switching valve (i.e. Figure 2 The low-temperature and low-pressure gaseous refrigerant of the first hot and cold switching subunit second switching valve 43, the second hot and cold switching subunit second switching valve 45, the third hot and cold switching subunit second switching valve 47, and the third hot and cold switching subunit second switching valve 49) shown in the figure converges and flows into the air intake of the gas-liquid separator 5 through the second outdoor unit filter 8; the air outlet of the gas-liquid separator 5 is connected to the air intake of the compressor 1 to output the low-temperature and low-pressure gaseous refrigerant flowing into the gas-liquid separator 5 to the compressor 1, thereby completing the refrigeration cycle of the entire heat recovery air-conditioning unit.

[0054] In another working mode, the first port of the four-way valve can be controlled to be connected to the third port, the second port of the four-way valve can be controlled to be connected to the fourth port, the first solenoid valve can be controlled to be opened and the second solenoid valve can be controlled to be closed, the first switching valves of all the hot and cold switching subunits can be controlled to be opened and the second switching valves of all the hot and cold switching subunits can be controlled to be closed, and the heat recovery air-conditioning unit enters the second working mode, at which time the heat recovery air-conditioning unit can realize the heating cycle.

[0055] Below Figure 2 Taking the heat recovery air conditioning unit shown in FIG. 1 as an example, the second working mode is described in detail. Figure 4 As shown ( Figure 4The direction of the arrow in the middle is the refrigerant flow direction), the first solenoid valve 16 is opened, the second solenoid valve 17 is closed, the D interface of the first four-way valve 18 is connected to the E interface, and the C interface of the first four-way valve 18 is connected to the S interface, the D interface of the second four-way valve 19 is connected to the E interface, and the C interface of the second four-way valve 19 is connected to the S interface, and the first switching valves in the hot and cold switching unit 130 are all opened (that is, the first switching valve 42 of the first hot and cold switching subunit, the first switching valve 44 of the second hot and cold switching subunit, the first switching valve 46 of the third hot and cold switching subunit, and the first switching valve 47 of the fourth hot and cold switching subunit The first and second switching valves 48 are all open), and the second switching valves are all closed (that is, the second switching valve 43 of the first cold and hot switching subunit, the second switching valve 45 of the second cold and hot switching subunit, the second switching valve 47 of the third cold and hot switching subunit, and the second switching valve 49 of the fourth cold and hot switching subunit are all closed), then the working mode of the heating cycle of the heat recovery air-conditioning unit is as follows: the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 1 passes through the oil separator 2, the one-way valve 6 and the first solenoid valve 16 in turn and flows into the first indoor unit 20, the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​respectively. Among them, the high-temperature and high-pressure gaseous refrigerant flows into the first air-cooled indoor heat exchanger 23 after passing through the first switching valve 42 of the first cold-heat switching subunit. In the first indoor unit 20, the high-temperature and high-pressure gaseous refrigerant is condensed into high-temperature and high-pressure liquid refrigerant through the first air-cooled indoor heat exchanger 23 and then flows into the first air-cooling valve 22. After being throttled by the first air-cooling valve 22, it is further condensed into high-temperature and high-pressure liquid refrigerant and then flows into the first indoor unit filter 21; similarly, the high-temperature and high-pressure gaseous refrigerant flows into the second air-cooled indoor heat exchanger 28 after passing through the first switching valve 44 of the second cold-heat switching subunit. In the second indoor unit 25, the high-temperature and high-pressure gaseous refrigerant is condensed into high-temperature and high-pressure liquid refrigerant through the second air-cooled indoor heat exchanger 28 and then flows into the second air-cooling valve 27. After being throttled by the second air-cooling valve 27, it flows into the first indoor unit filter 21. After being condensed into a high-temperature and high-pressure liquid refrigerant, it flows into the second indoor unit filter 26; the high-temperature and high-pressure gaseous refrigerant flows into the first water-cooled indoor heat exchanger 33 after passing through the first switching valve 44 of the third cold and hot switching subunit. In the third indoor unit 30, the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant through the first water-cooled indoor heat exchanger 33 and then flows into the first water-cooled valve 32. After being throttled by the first water-cooled valve 32 (further condensed high-temperature and high-pressure liquid refrigerant), it flows into the third indoor unit filter 31, wherein water flows into the first water-cooled indoor heat exchanger 33 through the first water pump 35 and the first water machine filter 34 in turn, and is output from the first water-cooled indoor heat exchanger 33 to the user's water use terminal (after heat exchange with the high-temperature and high-pressure gaseous refrigerant flowing through the first water-cooled indoor heat exchanger 33). Figure 4(not shown), the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant after heat exchange with water in the first water-cooled indoor heat exchanger 33; the high-temperature and high-pressure gaseous refrigerant passes through the first switching valve 46 of the fourth hot and cold switching subunit and flows into the second water-cooled indoor heat exchanger 39. In the fourth indoor unit 36, the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant through the second water-cooled indoor heat exchanger 39 and then flows into the second water-cooled valve 38. After throttling by the second water-cooled valve 38 (further condensed high-temperature and high-pressure liquid refrigerant), it flows into the fourth indoor unit filter 37; wherein water flows into the second water-cooled indoor heat exchanger 39 through the second water pump 41 and the second water machine filter 40 in turn, and is output from the second water-cooled indoor heat exchanger 39 to the user's water use terminal (after heat exchange with the high-temperature and high-pressure gaseous refrigerant flowing through the second water-cooled indoor heat exchanger 39). Figure 4 (not shown), the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant after heat exchange with water in the second water-cooled indoor heat exchanger 39. After the high-temperature and high-pressure liquid refrigerant passing through the first indoor unit filter 21 is combined with the high-temperature and high-pressure liquid refrigerant passing through the second indoor unit filter 26, the high-temperature and high-pressure liquid refrigerant passing through the third indoor unit filter 31, and the high-temperature and high-pressure liquid refrigerant passing through the fourth indoor unit filter 37, one path flows into the first outdoor heat exchanger 10 from the liquid pipe interface of the first outdoor heat exchanger 10 through the first outdoor unit electronic expansion valve 12 in sequence, and the other path flows into the second outdoor heat exchanger 13 from the liquid pipe interface of the second outdoor heat exchanger 13 through the second outdoor unit electronic expansion valve 15 in sequence; after passing through the first outdoor heat exchanger 10, it evaporates into a low-temperature and low-pressure gaseous refrigerant, which is output from the gas pipe interface of the first outdoor heat exchanger 10 to the first four-way After passing through the C interface of the first four-way valve 18, it flows into the air intake port of the gas-liquid separator 5 through the C interface of the first four-way valve 18, the S interface of the first four-way valve 18, and the second outdoor unit filter 8 in sequence; after passing through the second outdoor heat exchanger 13, the gaseous refrigerant evaporated into a low-temperature and low-pressure gaseous refrigerant is output from the gas pipe interface of the second outdoor heat exchanger 13 to the C interface of the second four-way valve 19, and then flows into the air intake port of the gas-liquid separator 5 through the C interface of the second four-way valve 19, the S interface of the second four-way valve 19, and the second outdoor unit filter 8 in sequence; the air outlet of the gas-liquid separator 5 is connected to the air intake port of the compressor 1 to output the low-temperature and low-pressure gaseous refrigerant flowing into the gas-liquid separator 5 to the compressor 1, thereby completing the heating cycle of the entire heat recovery air-conditioning unit.

[0056] In another working mode, the first port of the four-way valve can be controlled to be connected to the second port, the third port of the four-way valve can be controlled to be connected to the fourth port, the first solenoid valve can be controlled to be opened and the second solenoid valve can be controlled to be closed, the first switching valve of a part of the hot and cold switching subunits can be controlled to be opened and the second switching valve can be controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits can be controlled to be closed and the second switching valve can be opened, then the heat recovery air-conditioning unit enters the third working mode, at this time the heat recovery air-conditioning unit can realize the main refrigeration cycle.

[0057] Below Figure 2 Taking the heat recovery air conditioning unit shown in FIG. 1 as an example, the third working mode is described in detail. Specifically, Figure 5 As shown ( Figure 5The direction of the arrow in the middle is the refrigerant flow direction), the first solenoid valve 16 is opened, the second solenoid valve 17 is closed, the D interface of the first four-way valve 18 is connected to the C interface, and the E interface of the first four-way valve 18 is connected to the S interface, the D interface of the second four-way valve 19 is connected to the C interface, and the E interface of the second four-way valve 19 is connected to the S interface; the first indoor unit 20 performs a heating cycle, and the other indoor units (i.e., the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36) perform a cooling cycle; in the cold and hot switching unit 130, the first switching valves connected to the indoor units performing the heating cycle are all opened, and the indoor units performing the heating cycle are connected to the first switching valves. The second switching valves of the indoor units performing the refrigeration cycle are all closed, that is, the first switching valve 42 of the first cold and heat switching subunit is opened, and the second switching valve 43 of the first cold and heat switching subunit is closed; at the same time, the first switching valves connected to the indoor units performing the refrigeration cycle are all closed, and the second switching valves connected to the indoor units performing the refrigeration cycle are all opened, that is, the first switching valve 44 of the second cold and heat switching subunit, the first switching valve 46 of the third cold and heat switching subunit, and the first switching valve 48 of the fourth cold and heat switching subunit are all closed, and the second switching valve 45 of the second cold and heat switching subunit, the second switching valve 47 of the third cold and heat switching subunit, and the second switching valve 49 of the fourth cold and heat switching subunit are all opened. The refrigeration main cycle working mode of the heat recovery air-conditioning unit is as follows: the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 1 passes through the oil separator 2 and the one-way valve 6 in turn, and then flows into the first outdoor heat exchanger 10 through the D interface of the first four-way valve 18, the C interface of the first four-way valve 18 and the gas pipe interface of the first outdoor heat exchanger 10 in turn, and flows into the second outdoor heat exchanger 13 through the D interface of the second four-way valve 19, the C interface of the second four-way valve 19 and the gas pipe interface of the second outdoor heat exchanger 13 in turn, and then flows into the first air-cooled indoor unit 20 through the first solenoid valve 16 and the first switching valve 42 of the first cold and hot switching subunit. The indoor heat exchanger 23; the high-temperature and high-pressure gaseous refrigerant flowing into the first outdoor heat exchanger 10 is condensed into a high-temperature and high-pressure liquid refrigerant after passing through the first outdoor heat exchanger 10, and is output from the liquid pipe interface of the first outdoor heat exchanger 10 to the first outdoor unit electronic expansion valve 12; the high-temperature and high-pressure gaseous refrigerant flowing into the second outdoor heat exchanger 13 is condensed into a high-temperature and high-pressure liquid refrigerant after passing through the second outdoor heat exchanger 13, and is output from the liquid pipe interface of the second outdoor heat exchanger 13 to the second outdoor unit electronic expansion valve 15; the high-temperature and high-pressure liquid refrigerant passing through the first outdoor unit electronic expansion valve 12 merges with the high-temperature and high-pressure liquid refrigerant passing through the second outdoor unit electronic expansion valve 15 and then flows into the indoor unit unit 120.Specifically, in the first indoor unit 20, the high-temperature and high-pressure gaseous refrigerant flowing into the first air-cooled indoor heat exchanger 23 is condensed into a high-temperature and high-pressure liquid refrigerant in the first air-cooled indoor heat exchanger 23 and then flows into the first air-cooled valve 22. After being throttled by the first air-cooled valve 22, it is further condensed into a high-temperature and high-pressure liquid refrigerant and then flows into the first indoor unit filter 21; the high-temperature and high-pressure liquid refrigerant passing through the first indoor unit filter 21 merges with the high-temperature and high-pressure liquid refrigerant passing through the first outdoor unit electronic expansion valve 12 and the high-temperature and high-pressure liquid refrigerant passing through the second outdoor unit electronic expansion valve 15, and then flows into the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​respectively, so as to further perform heat exchange in the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​to improve the heat recovery efficiency. Among them, in the second indoor unit 25, the high-temperature and high-pressure liquid refrigerant is filtered by the second indoor unit filter 26 and then flows into the second air-cooling valve 27. After being throttled and condensed into low-temperature and low-pressure liquid refrigerant by the second air-cooling valve 27, it flows into the second air-cooled indoor heat exchanger 28. The second air-cooled indoor heat exchanger 28 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the second cold and hot switching subunit first switching valve 44 and the second cold and hot switching subunit second switching valve 45. In the third indoor unit 30, the high-temperature and high-pressure liquid refrigerant is filtered by the third indoor unit filter 31 and then flows into the first water-cooling valve 32. After being throttled and condensed into a low-temperature and low-pressure liquid refrigerant by the first water-cooled valve 32, it flows into the first water-cooled indoor heat exchanger 33. The first water-cooled indoor heat exchanger 33 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the third cold and hot switching subunit first switching valve 46 and the third cold and hot switching subunit second switching valve 47, wherein water flows into the first water-cooled indoor heat exchanger 33 through the first water pump 35 and the first water machine filter 34 in turn, and after heat exchange with the low-temperature and low-pressure liquid refrigerant flowing through the first water-cooled indoor heat exchanger 33, it is output by the first water-cooled indoor heat exchanger 33 to the user's water use terminal (. Figure 5 (not shown); in the fourth indoor unit 36, the high-temperature and high-pressure liquid refrigerant is filtered by the fourth indoor unit filter 37 and then flows into the second water-cooled valve 38, and then flows into the second water-cooled indoor heat exchanger 39 after being throttled and condensed into a low-temperature and low-pressure liquid refrigerant by the second water-cooled valve 38. The second water-cooled indoor heat exchanger 39 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the fourth cold and hot switching subunit first switching valve 48 and the fourth cold and hot switching subunit second switching valve 49, wherein water flows into the second water-cooled indoor heat exchanger 39 through the second water pump 41 and the second water machine filter 40 in turn, and is output by the second water-cooled indoor heat exchanger 39 to the user's water terminal after heat exchange with the low-temperature and low-pressure liquid refrigerant flowing through the second water-cooled indoor heat exchanger 39 ( Figure 544, the first switching valve 46 of the third cold-heat switching subunit and the first switching valve 48 of the fourth cold-heat switching subunit are cut off; at the same time, the low-temperature and low-pressure gaseous refrigerant flows to the second switching valve 45 of the second cold-heat switching subunit, the second switching valve 47 of the third cold-heat switching subunit and the second switching valve 49 of the fourth cold-heat switching subunit and passes normally, and the low-temperature and low-pressure gaseous refrigerant passing through the second switching valve 45 of the second cold-heat switching subunit and the low-temperature and low-pressure gaseous refrigerant passing through the second switching valve 47 of the third cold-heat switching subunit and the low-temperature and low-pressure gaseous refrigerant passing through the second switching valve 49 of the fourth cold-heat switching subunit are cut off; at the same time, the low-temperature and low-pressure gaseous refrigerant flows to the second switching valve 45 of the second cold-heat switching subunit, the second switching valve 47 of the third cold-heat switching subunit and ... After the gaseous refrigerant of the second switching valve 49 of the switching subunit converges, one path passes through the S interface of the first four-way valve 18 and the E interface of the first four-way valve 18 in sequence and then flows out from the E interface of the first four-way valve 18, the other path passes through the S interface of the second four-way valve 19 and the E interface of the second four-way valve 19 and then flows out from the E interface of the second four-way valve 19, and then flows into the air intake of the gas-liquid separator 5 through the second outdoor unit filter 8. The air outlet of the gas-liquid separator 5 is connected to the air intake of the compressor 1, so as to output the low-temperature and low-pressure gaseous refrigerant flowing into the gas-liquid separator 5 to the compressor 1, thereby completing the main refrigeration cycle of the entire heat recovery air-conditioning unit.

[0058] In another working mode, the first port of the four-way valve can be controlled to be connected to the third port, the second port of the four-way valve can be controlled to be connected to the fourth port, the first solenoid valve can be controlled to be opened and the second solenoid valve can be controlled to be closed, the first switching valve of a part of the hot and cold switching subunits can be controlled to be opened and the second switching valve can be controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits can be controlled to be closed and the second switching valve can be opened, then the heat recovery air-conditioning unit enters the fourth working mode, at this time the heat recovery air-conditioning unit can realize the main heating cycle.

[0059] Below Figure 2 Taking the heat recovery air conditioning unit shown in FIG. 1 as an example, the fourth working mode is described in detail. Specifically, Figure 6 As shown ( Figure 6The direction of the arrow in the middle is the refrigerant flow direction), the first solenoid valve 16 is opened, the second solenoid valve 17 is closed, the D interface of the first four-way valve 18 is connected to the E interface, and the C interface of the first four-way valve 18 is connected to the S interface, the D interface of the second four-way valve 19 is connected to the E interface, and the C interface of the second four-way valve 19 is connected to the S interface; the first indoor unit 20 performs a refrigeration cycle, and the other indoor units (i.e., the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36) perform a heating cycle; in the cold and hot switching unit 130, the first switching valve connected to the indoor unit performing the refrigeration cycle is closed, and the indoor heat exchanger corresponding to the indoor unit performing the refrigeration cycle is closed. The second switching valve of the first cold and hot switching subunit is opened, that is, the first switching valve 42 of the first cold and hot switching subunit is closed, and the second switching valve 43 of the first cold and hot switching subunit is opened; at the same time, the first switching valve connected to the indoor unit performing the heating cycle is opened, and the second switching valve corresponding to the indoor heat exchanger performing the refrigeration cycle is closed, that is, the first switching valve 44 of the second cold and hot switching subunit, the first switching valve 46 of the third cold and hot switching subunit, and the first switching valve 48 of the fourth cold and hot switching subunit are all opened, and the second switching valve 45 of the second cold and hot switching subunit, the second switching valve 47 of the third cold and hot switching subunit, and the second switching valve 49 of the fourth cold and hot switching subunit are all closed. Then the main heating cycle working mode of the heat recovery air conditioning unit is as follows: the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 1 passes through the oil separator 2 and the one-way valve 6 in turn, and then flows into the second indoor unit 25, the third indoor unit 30, and the fourth indoor unit 36 ​​through the first solenoid valve 16. The high-temperature and high-pressure gaseous refrigerant flows into the second air-cooled indoor heat exchanger 28 after passing through the first switching valve 44 of the second cold-heat switching subunit. In the second indoor unit 25, the high-temperature and high-pressure gaseous refrigerant is condensed into high-temperature and high-pressure liquid refrigerant through the second air-cooled indoor heat exchanger 28 and then flows into the second air-cooled valve 27. After being throttled by the second air-cooled valve 27, it is further condensed into high-temperature and high-pressure liquid refrigerant and then flows into the second indoor unit filter 26; the high-temperature and high-pressure gaseous refrigerant flows into the first water-cooled indoor heat exchanger 33 after passing through the first switching valve 44 of the third cold-heat switching subunit. In the indoor unit 30, the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by the first water-cooled indoor heat exchanger 33, and then flows into the first water-cooled valve 32. After being throttled by the first water-cooled valve 32 (further condensed high-temperature and high-pressure liquid refrigerant), it flows into the third indoor unit filter 31, wherein water flows into the first water-cooled indoor heat exchanger 33 through the first water pump 35 and the first water machine filter 34 in turn, and is output from the first water-cooled indoor heat exchanger 33 to the user's water terminal (after heat exchange with the high-temperature and high-pressure gaseous refrigerant flowing through the first water-cooled indoor heat exchanger 33). Figure 6(not shown), the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant after heat exchange with water in the first water-cooled indoor heat exchanger 33; the high-temperature and high-pressure gaseous refrigerant passes through the first switching valve 46 of the fourth hot and cold switching subunit and flows into the second water-cooled indoor heat exchanger 39. In the fourth indoor unit 36, the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant through the second water-cooled indoor heat exchanger 39 and then flows into the second water-cooled valve 38. After throttling by the second water-cooled valve 38 (further condensed high-temperature and high-pressure liquid refrigerant), it flows into the fourth indoor unit filter 37; wherein water flows into the second water-cooled indoor heat exchanger 39 through the second water pump 41 and the second water machine filter 40 in turn, and is output from the second water-cooled indoor heat exchanger 39 to the user's water use terminal (after heat exchange with the high-temperature and high-pressure gaseous refrigerant flowing through the second water-cooled indoor heat exchanger 39). Figure 6(not shown), the high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant after heat exchange with water in the second water-cooled indoor heat exchanger 39. After the high-temperature and high-pressure liquid refrigerant passing through the second indoor unit filter 26 merges with the high-temperature and high-pressure liquid refrigerant passing through the third indoor unit filter 31 and the high-temperature and high-pressure liquid refrigerant passing through the fourth indoor unit filter 37, one path flows into the first indoor unit 20, and the other path flows into the outdoor unit 110. In the first indoor unit 20, the high-temperature and high-pressure liquid refrigerant is filtered by the first indoor unit filter 21 and then flows into the first air-cooling valve 22. After being throttled and condensed into a low-temperature and low-pressure liquid refrigerant by the first air-cooling valve 22, it flows into the first air-cooling indoor heat exchanger 23. The first air-cooling indoor heat exchanger 23 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the first switching valve 42 of the first cold and hot switching subunit and the second switching valve 43 of the first cold and hot switching subunit. The low-temperature and low-pressure gaseous refrigerant is stopped when it flows to the first switching valve 42 of the first cold and hot switching subunit. After the low-temperature and low-pressure gaseous refrigerant passes through the second switching valve 43 of the first cold and hot switching subunit, it flows into the air intake of the gas-liquid separator 5 through the second outdoor unit filter 8; in the outdoor unit 110, the high-temperature and high-pressure liquid refrigerant passing through the second indoor unit filter 26 is combined with the high-temperature and high-pressure liquid refrigerant passing through the third indoor unit filter 31 and the high-temperature and high-pressure liquid refrigerant passing through the fourth indoor unit filter 37. One path flows into the first outdoor heat exchanger 10 from the liquid pipe interface of the first outdoor heat exchanger 10 through the first outdoor unit electronic expansion valve 12, and the other path flows into the second outdoor heat exchanger 13 from the liquid pipe interface of the second outdoor heat exchanger 13 through the second outdoor unit electronic expansion valve 15. The high-temperature and high-pressure liquid refrigerant flowing into the first outdoor heat exchanger 10 evaporates into a low-temperature and low-pressure gaseous refrigerant in the first outdoor heat exchanger 10, and then is output from the gas pipe interface of the first outdoor heat exchanger 10 to the C interface of the first four-way valve 18, and then flows into the air intake port of the gas-liquid separator 5 through the C interface of the first four-way valve 18, the S interface of the first four-way valve 18, and the second outdoor unit filter 8; the high-temperature and high-pressure liquid refrigerant flowing into the second outdoor heat exchanger 13 evaporates into a low-temperature and low-pressure gaseous refrigerant in the second outdoor heat exchanger 13. The low-temperature and low-pressure gaseous refrigerant is then output from the gas pipe interface of the second outdoor heat exchanger 13 to the C interface of the second four-way valve 19, and flows into the air intake port of the gas-liquid separator 5 through the C interface of the second four-way valve 19, the S interface of the second four-way valve 19, and the second outdoor unit filter 8; the air outlet of the gas-liquid separator 5 is connected to the air intake port of the compressor 1, so as to output the low-temperature and low-pressure gaseous refrigerant that flows into the gas-liquid separator 5 through the air intake port of the gas-liquid separator 5 to the compressor 1, thereby completing the main heating cycle of the entire heat recovery air-conditioning unit.

[0060] In yet another working mode, when the outdoor unit includes multiple circulation pipelines, the first port of the four-way valve on at least one circulation pipeline can be controlled to be connected to the third port, and the second port to the fourth port, the first solenoid valve can be controlled to be opened and the second solenoid valve can be controlled to be closed, the second valve can be controlled to be closed, the first switching valve of a part of the hot and cold switching subunits can be controlled to be opened and the second switching valve can be controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits can be controlled to be closed and the second switching valve can be opened, then the heat recovery air conditioning unit enters the fifth working mode, at which time the heat recovery air conditioning unit can achieve a balanced cycle of cooling and heating. Among them, in the fifth working mode, the refrigerant does not flow through the outdoor heat exchanger, that is, in the fifth working mode, heat exchange is not performed through the outdoor heat exchanger, but only heat exchange is performed through the indoor heat exchanger to achieve a balanced cycle of cooling and heating, thereby improving the heat recovery efficiency.

[0061] Below Figure 2 Taking the heat recovery air conditioning unit shown in FIG. 1 as an example, the first balanced working mode is described in detail. Specifically, Figure 7 As shown ( Figure 7The direction of the arrow in the middle is the refrigerant flow direction), the first solenoid valve 16 is opened, the second solenoid valve 17 is closed, the D interface of the first four-way valve 18 is connected to the E interface, and the C interface of the first four-way valve 18 is connected to the S interface, the D interface of the second four-way valve 19 is connected to the E interface, and the C interface of the second four-way valve 19 is connected to the S interface, the first outdoor unit electronic expansion valve 12 (i.e., the second valve) and the second outdoor unit electronic expansion valve 15 (i.e., the second valve) are closed; in the hot and cold switching unit 130, the first switching valve 42 of the first hot and cold switching subunit, the first switching valve 44 of the second hot and cold switching subunit, the second switching valve 47 of the third hot and cold switching subunit and the second switching valve 49 of the fourth hot and cold switching subunit are all closed, the first hot and cold switching subunit The first switching valve 43 and the second switching valve 45 of the second cold / hot switching subunit are both opened, the first switching valve 46 of the third cold / hot switching subunit and the first switching valve 48 of the fourth cold / hot switching subunit are both opened, then the first balanced working mode of the heat recovery air-conditioning unit is as follows: the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 1 passes through the oil separator 2 and the one-way valve 6 in turn, one way passes through the D interface of the first four-way valve 18 and the E interface of the first four-way valve 18 in turn, and then flows out from the E interface of the first four-way valve 18, the other way passes through the D interface of the second four-way valve 19 and the E interface of the second four-way valve 19 in turn, and then flows out from the E interface of the second four-way valve 19, and then passes through the first solenoid valve 16 and flows into the third indoor unit 30 and the fourth indoor unit 36 ​​respectively. Among them, in the third indoor unit 30, the high-temperature and high-pressure gaseous refrigerant flowing into the first water-cooled indoor heat exchanger 33 is condensed into a high-temperature and high-pressure liquid refrigerant in the first water-cooled indoor heat exchanger 33 and then flows into the first water-cooled valve 32. After being throttled by the first water-cooled valve 32 and further condensed into a high-temperature and high-pressure liquid refrigerant, it flows into the third indoor unit filter 31, wherein water flows into the first water-cooled indoor heat exchanger 33 through the first water pump 35 and the first water machine filter 34 in turn, and after heat exchange with the high-temperature and high-pressure gaseous refrigerant flowing through the first water-cooled indoor heat exchanger 33, it is output from the first water-cooled indoor heat exchanger 33 to the user's water use terminal ( Figure 7(not shown); in the fourth indoor unit 36, the high-temperature and high-pressure gaseous refrigerant flowing into the second water-cooled indoor heat exchanger 39 is condensed into a high-temperature and high-pressure liquid refrigerant in the second water-cooled indoor heat exchanger 39 and then flows into the second water-cooled valve 38. After being throttled by the second water-cooled valve 38, it is further condensed into a high-temperature and high-pressure liquid refrigerant and then flows into the fourth indoor unit filter 37; after the high-temperature and high-pressure liquid refrigerant passing through the third indoor unit filter 31 merges with the high-temperature and high-pressure liquid refrigerant passing through the fourth indoor unit filter 37, one path flows into the second indoor unit 25 for further heat exchange, and the other path flows into the first indoor unit 20 for further heat exchange, thereby improving the heat recovery efficiency. Among them, in the first indoor unit 20, the high-temperature and high-pressure liquid refrigerant is filtered by the first indoor unit filter 21 and then flows into the first air-cooling valve 22. After being throttled and condensed into low-temperature and low-pressure liquid refrigerant by the first air-cooling valve 22, it flows into the first air-cooling indoor heat exchanger 23. The first air-cooling indoor heat exchanger 23 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the first switching valve 42 of the first cold and hot switching subunit and the second switching valve 43 of the first cold and hot switching subunit; in the second indoor unit 25, the high-temperature and high-pressure liquid refrigerant is filtered by the second indoor unit filter 26 and then flows into the second air-cooling valve 27. The valve 27 throttles and condenses the liquid refrigerant into a low-temperature and low-pressure liquid refrigerant, which then flows into the second air-cooled indoor heat exchanger 28. The second air-cooled indoor heat exchanger 28 outputs the evaporated low-temperature and low-pressure gaseous refrigerant to the second hot and cold switching subunit first switching valve 44 and the second hot and cold switching subunit second switching valve 45; the low-temperature and low-pressure gaseous refrigerant is cut off when it flows to the first hot and cold switching subunit first switching valve 42 and the second hot and cold switching subunit first switching valve 44, and passes normally when it flows to the first hot and cold switching subunit second switching valve 43 and the second hot and cold switching subunit second switching valve 45. The low-temperature and low-pressure gaseous refrigerant passing through the second switching valve 43 of the first hot and cold switching subunit merges with the low-temperature and low-pressure gaseous refrigerant passing through the second switching valve 45 of the second hot and cold switching subunit and then flows into the air intake of the gas-liquid separator 5 through the second outdoor unit filter 8; the air outlet of the gas-liquid separator 5 is connected to the air intake of the compressor 1, so as to output the low-temperature and low-pressure gaseous refrigerant flowing into the gas-liquid separator 5 to the compressor 1, thereby completing the cooling and heating balanced cycle of the entire heat recovery air-conditioning unit.

[0062] Based on the heat recovery air-conditioning unit provided in an embodiment of the present invention, when one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve (wherein the valve connected to the water-cooled indoor heat exchanger is a water-cooled valve, and the valve connected to the air-cooled indoor heat exchanger is an air-cooled valve), the other end of the outdoor heat exchanger is connected to the first valve through a second valve, and the working mode of the heat recovery air-conditioning unit is the above-mentioned heating cycle or the above-mentioned heating main cycle working mode, since the current method of controlling the water-cooled valve is to control the water-cooled valve with reference to the method of controlling the air-cooled valve, that is: first, it is necessary to obtain the subcooling degree of an indoor unit with an air-cooled indoor heat exchanger in the heat recovery air-conditioning unit (the difference between the saturation temperature corresponding to the compressor exhaust pressure and the liquid outlet temperature of the air-cooled indoor heat exchanger), and then according to the subcooling degree of the indoor unit The opening of the air-cooling valve is controlled according to the preset target supercooling degree of the indoor unit. However, in actual situations, the method of controlling the air-cooling valve is not actually suitable for controlling the water-cooling valve. The reason is that: the opening of the air-cooling valve is currently controlled according to the supercooling degree of the indoor unit. However, in the indoor unit with an air-cooled indoor heat exchanger, the refrigerant in the air-cooled indoor heat exchanger exchanges heat with the air, while in the indoor unit with a water-cooled indoor heat exchanger, the refrigerant in the water-cooled indoor heat exchanger exchanges heat with water. Since the specific heat capacity of water is different from that of air (the specific heat capacity of water is about 4 times that of air), it is obviously unreasonable to use supercooling to control the opening of the water-cooling valve, which makes it difficult to simultaneously meet the user's comfort needs for air-conditioning heating and the user's needs for domestic hot water or floor heating functions, further resulting in low heat recovery efficiency.

[0063] Based on the above reasons, in order to further improve the heat recovery efficiency of the heat recovery air conditioning unit, the embodiment of the present invention also provides a control method for the heat recovery air conditioning unit, see Figure 8 As shown, the following steps are included:

[0064] Step S810: within a predetermined time period of running any working mode, obtain the outdoor unit capacity of the outdoor unit, the indoor unit parameters of each indoor unit with an air-cooled indoor heat exchanger, and the preset initial opening of the water-cooled valve in each indoor unit with a water-cooled indoor heat exchanger.

[0065] Specifically, the predetermined time may be the time from the start-up of the multiple indoor units to the normal operation state (i.e., the normal operation state). In the specific implementation, the predetermined time and the preset initial opening of the water cooling valve may be set by those skilled in the art according to the actual situation, and the embodiment of the present invention does not limit this. Among them, the indoor unit parameters may include but are not limited to: indoor unit capacity, indoor unit set temperature, and indoor unit return air temperature.

[0066] Step S820: Calculate the difference between the indoor unit set temperature and the indoor unit return air temperature in each indoor unit with an air-cooled indoor heat exchanger as the return air temperature difference corresponding to the air-cooled indoor heat exchanger.

[0067] Step S830: Determine the target opening of the first target water-cooled valve according to the capacity of the outdoor unit, the return air temperature difference corresponding to each air-cooled indoor heat exchanger, the capacity of each indoor unit corresponding to the air-cooled indoor heat exchanger, and the first preset initial opening of the first target water-cooled valve connected to the first target water-cooled indoor heat exchanger in the first target indoor unit; the first target indoor unit is any one of the indoor units with water-cooled indoor heat exchangers.

[0068] Specifically, the target opening can be calculated according to the following formula:

[0069]

[0070] Among them, EVW is the target opening, EVW_S is the first preset initial opening of the first target water-cooled valve, Hpo is the outdoor unit capacity, Hpi(k) is the indoor unit capacity of the kth indoor unit with an air-cooled indoor heat exchanger, wherein m≥k≥1, m≥1; k, m are integers; ΔTh(k) is the return air temperature difference of the kth indoor unit with an air-cooled indoor heat exchanger.

[0071] Step S840: Control the first target water-cooling valve to open at a target opening degree.

[0072] It can be seen that in the process of multiple indoor units from startup to normal operation, the embodiment of the present invention can calculate the target opening of the first target water-cooled valve according to the capacity of the outdoor unit, the return air temperature difference corresponding to each air-cooled indoor heat exchanger, the capacity of each indoor unit corresponding to the air-cooled indoor heat exchanger, and the first preset initial opening of the first target water-cooled valve connected to the first target water-cooled indoor heat exchanger in the first target indoor unit, and control the first target water-cooled valve to open with the target opening. The embodiment of the present invention comprehensively considers the user's comfort demand for air-conditioning heating and the user's demand for domestic hot water or providing floor heating functions, effectively avoids the situation where it is difficult to simultaneously meet the user's comfort demand for air-conditioning heating and the user's demand for domestic hot water or providing floor heating functions, and effectively improves the heat recovery efficiency.

[0073] After running any working mode for a predetermined period of time, that is, when multiple indoor units are in normal operation, refer to Fig. 9 As shown, the control method of the heat recovery air conditioning unit provided by the embodiment of the present invention may include the following steps:

[0074] Step S910: When any working mode is run for more than a predetermined time, the current exhaust pressure of the compressor, the preset target exhaust pressure, the set temperature of the indoor heat exchanger in the second target indoor unit, the outlet water temperature and the return water temperature are obtained every preset period; wherein the second target indoor unit is any indoor unit with a water-cooled indoor heat exchanger.

[0075] Specifically, the return water temperature of the water-cooled indoor heat exchanger of the second target indoor unit is the temperature of the water inlet of the second target indoor unit, and the set temperature of the water-cooled indoor heat exchanger of the second target indoor unit is the water outlet temperature of the water-cooled indoor heat exchanger of the second target indoor unit pre-set by the user according to actual conditions. The current exhaust pressure, the preset target exhaust pressure, the set temperature of the indoor heat exchanger in the second target indoor unit, the water outlet temperature and the return water temperature can be set by those skilled in the art according to actual conditions, and the embodiment of the present invention does not limit this. For example, if the second target indoor unit is the third indoor unit 30, the return water temperature of the first water-cooled indoor heat exchanger 33 of the third indoor unit 30 can be obtained by the water inlet temperature sensor Twi1 near the water inlet of the first water-cooled indoor heat exchanger 33.

[0076] The preset period can be set by those skilled in the art according to actual conditions, and the embodiment of the present invention is not limited to this.

[0077] Step S920: determining a target temperature difference of the water-cooled indoor heat exchanger in the second target indoor unit according to the current exhaust pressure, the preset target exhaust pressure, and the set temperature.

[0078] Specifically, the target temperature difference can be calculated according to the following formula:

[0079] Twho=Twhose+[5×(Pd-Pdo)]-1;

[0080] Among them, Twho is the above-mentioned target temperature difference, Pd is the current exhaust pressure, Pdo is the preset target exhaust pressure, and Twhose is the set temperature of the indoor heat exchanger in the second target indoor unit; in the specific implementation, 0≤Twhoset≤a℃, where a is the control constant.

[0081] Among them, the method for obtaining the current exhaust pressure, the preset target exhaust pressure, and the set temperature can be set by those skilled in the art according to actual conditions, and the embodiment of the present invention is not limited to this.

[0082] Step S930: Calculate the difference between the outlet water temperature and the target temperature difference, and use the difference result as the outlet and return water temperature difference.

[0083] Specifically, the above-mentioned outlet and return water temperature difference can be calculated according to the following formula:

[0084] ΔTwh=Two-Twi;

[0085] Wherein, ΔTwh is the outlet and return water temperature difference, Two is the outlet water temperature of the indoor heat exchanger in the second target indoor unit, and Twi is the return water temperature of the indoor heat exchanger in the second target indoor unit.

[0086] In a specific implementation, the return water temperature of the indoor heat exchanger of the second target indoor unit can be obtained by a water inlet temperature sensor disposed near the water inlet of the second target indoor unit; the outlet water temperature of the indoor heat exchanger of the second target indoor unit can be obtained by a water outlet temperature sensor disposed near the water outlet of the second target indoor unit. Figure 2 In the heat recovery air-conditioning unit shown, if the second target indoor unit is the third indoor unit 30, the outlet water temperature of the first water-cooled indoor heat exchanger 33 can be obtained through the water inlet temperature sensor Two1, and the return water temperature of the first water-cooled indoor heat exchanger 33 can be obtained through the water inlet temperature sensor Twi1. If the second target indoor unit is the fourth indoor unit 36, the outlet water temperature of the second water-cooled indoor heat exchanger 39 can be obtained through the water inlet temperature sensor Two2, and the return water temperature of the second water-cooled indoor heat exchanger 39 can be obtained through the water inlet temperature sensor Twi2.

[0087] Step S940: controlling the second water-cooling valve connected to the water-cooled indoor heat exchanger in the second target indoor unit according to the outlet and return water temperature difference and the target temperature difference.

[0088] Specifically, see Fig.10 As shown, this step can be performed in the following ways:

[0089] Step S1010: Determine whether the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is greater than the first target temperature difference in the nth cycle; wherein n≥2 and n is an integer.

[0090] Among them, if the judgment result is no, that is, the first outlet and return water temperature difference in the nth cycle is less than or equal to the first target temperature difference in the nth cycle, it means that the current heating capacity of the second target indoor unit cannot meet the user's demand for domestic hot water or provide floor heating function, then step S1020 is executed, so as to effectively control the second opening of the second water-cooled valve of the second target indoor unit through step S1020 and its subsequent steps (corresponding to step S1030), so as to effectively control the refrigerant flow in the air-cooled indoor heat exchanger and the water-cooled indoor heat exchanger in the heat recovery air-conditioning unit, so as to achieve the purpose of simultaneously meeting the user's comfort demand for air-conditioning heating and the user's demand for domestic hot water or providing floor heating function.

[0091] If the judgment result is yes, that is, the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is greater than the first target temperature difference of the second target indoor unit in the nth cycle, it means that the heating capacity of the current second target indoor unit can meet the user's demand for domestic hot water or provide floor heating function, then execute step S1050.

[0092] The first target temperature difference is the target temperature difference of the second target indoor unit in the nth cycle. The first target temperature difference is obtained in the same manner as the target temperature difference in step S920. For details, please refer to the corresponding description in step S920, which will not be repeated here. The first outflow and return water temperature difference is the outflow and return water temperature difference of the second target indoor unit in the nth cycle. The first outflow and return water temperature difference is obtained in the same manner as the return water temperature difference in step S930. For details, please refer to the corresponding description in step S930, which will not be repeated here.

[0093] Step S1020: Obtain the second outlet and return water temperature difference, the second target temperature difference, and the first opening of the water cooling valve in the n-1th cycle.

[0094] Specifically, the second outlet and return water temperature difference is the outlet and return water temperature difference of the second target indoor unit in the n-1th cycle, and the second target temperature difference is the target temperature difference of the second target indoor unit in the n-1th cycle. In the specific implementation, the second target temperature difference is obtained in the same manner as the target temperature difference in step S920, and the corresponding description in step S920 can be specifically referred to, which will not be repeated here. The second outlet and return water temperature difference is obtained in the same manner as the outlet and return water temperature difference in step S930, and the corresponding description in step S930 can be specifically referred to, which will not be repeated here.

[0095] The first opening degree of the water-cooling valve is the opening degree of the water-cooling valve connected to the indoor heat exchanger in the second target indoor unit in the n-1th cycle.

[0096] Step S1030: Calculate a first difference between the first target temperature difference and the first outlet and return water temperature difference, and calculate a second difference between the second target temperature difference and the second outlet and return water temperature difference.

[0097] Specifically, the first difference can be calculated according to the following formula:

[0098] dThw(n)=Twho(n)-ΔTwh(n);

[0099] Among them, dThw(n) is the first difference, Twho(n) is the first outlet and return water temperature difference of the kth indoor unit with a water-cooled indoor heat exchanger in the nth cycle, and ΔTwh(n) is the first target temperature difference of the kth indoor unit with a water-cooled indoor heat exchanger in the nth cycle.

[0100] At the same time, the second difference can be calculated according to the following formula:

[0101] dThw(n-1)=Twho(n-1)-ΔTwh(n-1);

[0102] Among them, dThw(n) is the second difference, Twho(n-1) is the second outlet and return water temperature difference of the kth indoor unit with a water-cooled indoor heat exchanger in the n-1th cycle, and ΔTwh(n-1) is the second target temperature difference of the kth indoor unit with a water-cooled indoor heat exchanger in the n-1th cycle.

[0103] In a specific implementation, when n=2, the opening degree of the first water-cooled indoor heat exchanger solenoid valve of the kth indoor unit with a water-cooled indoor heat exchanger in the n-1th cycle is the above-mentioned target opening degree (the calculation method of the target opening degree can refer to the corresponding description in the subsequent steps S910 to S940).

[0104] Step S1040: calculating the second opening of the water cooling valve in the nth cycle according to the first difference, the second difference and the first opening of the water cooling valve.

[0105] Specifically, the second opening of the water cooling valve can be calculated according to the following formula:

[0106] EVW(n)=EVW(n-1)+kpx{dThw(n)-dThw(n-1)}+kixdThw(n);

[0107] Among them, EVW(n) is the second opening of the water cooling valve, EVW(n-1) is the first opening of the water cooling valve, dThw(n) is the first difference, dThw(n-1) is the second difference, kp and ki are control constants.

[0108] Step S1050: close the second water cooling valve.

[0109] When it is determined that the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is greater than the first target temperature difference of the second target indoor unit in the nth cycle, the second water cooling valve is closed to effectively increase the flow rate of the refrigerant flowing into the indoor unit with the air-cooled indoor heat exchanger, thereby ensuring the heating capacity of the indoor unit with the air-cooled indoor heat exchanger and meeting the user's comfort requirements for air-conditioning heating.

[0110] The embodiment of the present invention also provides a control device for a heat recovery air conditioning unit. It can be understood that the control device for a heat recovery air conditioning unit provided by the embodiment of the present invention is used to implement the corresponding functions in the above-mentioned method embodiment, which includes hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0111] The embodiment of the present invention can divide the control device of the heat recovery air conditioning unit into functional modules according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0112] In the case of dividing each functional module into corresponding functional modules, Fig.11 FIG. 4 shows a functional structure block diagram of a control device for a heat recovery air conditioning unit involved in an embodiment of the present invention. Fig.11 As shown, the control device 1110 of the heat recovery air conditioning unit is specifically used to implement the above Figure 3-Figure 7 In the corresponding control method, the control device 1110 of the heat recovery air conditioning unit can be a separate device or integrated in the main control board of the heat recovery air conditioning unit. The control device 1110 of the heat recovery air conditioning unit includes: a working mode control module 1111, which is used to:

[0113] The first port of the four-way valve is controlled to be connected with the second port, the third port of the four-way valve is controlled to be connected with the fourth port, the first solenoid valve is controlled to be closed and the second solenoid valve is controlled to be opened, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be opened, and the heat recovery air conditioning unit enters the first working mode;

[0114] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be closed, and the heat recovery air conditioning unit enters the second working mode;

[0115] Alternatively, the first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air conditioning unit enters the third working mode;

[0116] Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air-conditioning unit enters the fourth working mode.

[0117] Optionally, when one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, and the other end of the outdoor heat exchanger is connected to the first valve through a second valve, and when the outdoor unit includes multiple circulation pipelines, the first port of the four-way valve on at least one circulation pipeline is controlled to be connected to the third port, and the second port to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the second valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is opened, then the heat recovery air-conditioning unit enters the fifth working mode.

[0118] Optionally, when one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, wherein the first valve connected to the water-cooled indoor heat exchanger is a water-cooled valve, the control device 1110 of the heat recovery air-conditioning unit further includes: a first water-cooled valve control module 1112, which is used to: obtain the outdoor unit capacity of the outdoor unit, the indoor unit parameters of each indoor unit with an air-cooled indoor heat exchanger, and the preset initial opening of the water-cooled valve in each indoor unit with a water-cooled indoor heat exchanger within a predetermined time of running any working mode; wherein the indoor unit parameters include: indoor unit capacity, indoor unit set temperature, and indoor unit return air temperature; Calculate the difference between the indoor unit set temperature and the indoor unit return air temperature in each indoor unit with an air-cooled indoor heat exchanger as the return air temperature difference corresponding to the air-cooled indoor heat exchanger; determine the target opening of the first target water-cooled valve according to the capacity of the outdoor unit, the return air temperature difference corresponding to each air-cooled indoor heat exchanger, the capacity of each indoor unit corresponding to the air-cooled indoor heat exchanger, and the first preset initial opening of the first target water-cooled valve connected to the first target water-cooled indoor heat exchanger in the first target indoor unit; wherein the first target indoor unit is any one of the indoor units with water-cooled indoor heat exchangers; and control the first target water-cooled valve to open at the target opening.

[0119] Optionally, the water-cooled valve control module 1112 is specifically used to calculate the target opening according to the following formula:

[0120]

[0121] Among them, EVW is the target opening, EVW_S is the preset initial opening of the first target water-cooled valve, Hpo is the outdoor unit capacity, Hpi(k) is the indoor unit capacity of the kth indoor unit with an air-cooled indoor heat exchanger, where m≥k≥1, m≥1, k, m are integers; ΔTh(k) is the return air temperature difference of the kth indoor unit with an air-cooled indoor heat exchanger.

[0122] Optionally, when one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, wherein the first valve connected to the water-cooled indoor heat exchanger is a water-cooled valve, the control device 1110 of the heat recovery air-conditioning unit also includes: a second water-cooled valve control module 1113, which is used to: when any working mode is operated for more than a predetermined time, obtain the current exhaust pressure of the compressor, the preset target exhaust pressure, the set temperature of the indoor heat exchanger in the second target indoor unit, the outlet water temperature and the return water temperature at preset intervals; wherein the second target indoor unit is any of the indoor units with a water-cooled indoor heat exchanger; determine the target temperature difference of the water-cooled indoor heat exchanger in the second target indoor unit according to the current exhaust pressure, the preset target exhaust pressure, and the set temperature; calculate the difference between the outlet water temperature and the target temperature difference, and use the difference result as the outlet and return water temperature difference; and control the second water-cooled valve connected to the water-cooled indoor heat exchanger in the second target indoor unit according to the outlet and return water temperature difference and the target temperature difference.

[0123] Optionally, the second water-cooling valve control module 1113 is specifically used for: when it is determined that the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is less than or equal to the first target temperature difference of the second target indoor unit, obtaining the second outlet and return water temperature difference, the second target temperature difference, and the first opening of the water-cooling valve of the second target indoor unit in the n-1th cycle; wherein n≥2 and n is an integer; calculating the first difference between the first target temperature difference and the first outlet and return water temperature difference, and calculating the second difference between the second target temperature difference and the second outlet and return water temperature difference; calculating the second opening of the water-cooling valve in the nth cycle according to the first difference, the second difference, and the first opening of the water-cooling valve; and controlling the second water-cooling valve to open at the second opening of the water-cooling valve.

[0124] Optionally, the second water cooling valve control module 1113 is specifically used to: close the second water cooling valve when it is determined that the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is greater than the first target temperature difference of the second target indoor unit in the nth cycle.

[0125] All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and its role will not be repeated here.

[0126] In the case of adopting an integrated module, the control device of the heat recovery air conditioning unit includes: a processing unit and an interface unit. The processing unit is used to control and manage the actions of the control device of the heat recovery air conditioning unit. For example, the processing unit is used to execute a computer program or instruction to implement the functions of the control device of the heat recovery air conditioning unit. For example, in the control device 1110 of the heat recovery air conditioning unit, the processing unit supports the control device 1110 of the heat recovery air conditioning unit to execute Fig. 9 Step S920, step S930, step S940, and Fig.10 Step S1010, step S1030, and step S1040 in the embodiment; the interface unit is used to support the interaction of the control device 1110 of the heat recovery air conditioning unit with other devices, such as the interaction with the water inlet temperature sensor, and the interface unit is used to support the control device 1110 of the heat recovery air conditioning unit to perform Fig. 9 Step S910 in , and Fig.10 The control device 1110 of the heat recovery air conditioning unit may further include a storage unit for storing a computer program or instruction of the control device of the heat recovery air conditioning unit.

[0127] The processing unit is a processor and the interface unit is a communication interface. Fig.12 As shown, it includes a communication interface 1201 and a processor 1202 ; wherein the communication interface 1201 and the processor 1202 are coupled, and illustratively, the communication interface 1201 and the processor 1202 can be coupled via a bus 1204 .

[0128] The processor 1202 may be a general-purpose central processing unit (CPU), a controller, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

[0129] Of course, the processor 1202 may also be integrated with a storage device for storing computer programs or instructions of the control device of the heat recovery air conditioning unit, or the storage device may be provided separately, for example Fig.12As shown in the figure, a separate memory 1203 is provided to store the computer program or instruction of the control device of the heat recovery air conditioning unit. The memory 1203 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory may be independent and connected to the processor through a bus; the memory may also be integrated with the processor. In this solution, the memory 1203 is used to store computer programs or instructions for executing the solution of this application, and the execution is controlled by the processor 1202. The communication interface 1201 is used to support the interaction between the control device of the heat recovery air conditioning unit and other devices, such as the interaction with the water inlet temperature sensor.

[0130] An embodiment of the present invention further provides a computer program product, which includes instructions. When the instructions are run on a computer, they are used to execute the heat recovery air conditioning unit control method for the heat recovery air conditioning unit as described above.

[0131] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods of each embodiment of the present application.

[0133] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A heat recovery air conditioning unit, characterized in that: include: Outdoor unit, indoor unit and hot and cold switching unit; among them, The outdoor unit comprises at least one circulation pipeline, wherein one end of the circulation pipeline is connected to the exhaust port of the compressor, and the other end of the circulation pipeline is connected to the suction port of the compressor through a gas-liquid separator; a four-way valve and an outdoor heat exchanger are arranged on the circulation pipeline, wherein the exhaust port of the compressor is connected to the first port of the four-way valve; one end of the outdoor heat exchanger is connected to the second port of the four-way valve; the third port of the four-way valve is closed, and the fourth port of the four-way valve is connected to the suction port of the compressor through the gas-liquid separator; one end of the first solenoid valve is connected to the pipeline between the exhaust port of the compressor and the first port of the four-way valve, and one end of the second solenoid valve is connected to the pipeline between the fourth port of the four-way valve and the gas-liquid separator; The indoor unit comprises a plurality of indoor units, wherein the plurality of indoor units comprises a plurality of indoor units with air-cooled indoor heat exchangers and a plurality of indoor units with water-cooled indoor heat exchangers; the indoor unit comprises an indoor heat exchanger, one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger; the indoor unit with the air-cooled indoor heat exchanger comprises a fan; The hot and cold switching unit includes a plurality of hot and cold switching sub-units, wherein each hot and cold switching sub-unit corresponds to one of the indoor units; the hot and cold switching sub-units includes a first switching valve and a second switching valve; the other end of the first solenoid valve and the other end of the second solenoid valve are connected to the other end of the indoor heat exchanger through the first switching valve; the other end of the indoor heat exchanger is also connected to the pipeline between the second port of the four-way valve and the gas-liquid separator through the second switching valve.

2. The heat recovery air conditioning unit according to claim 1, characterized in that: One end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, and the other end of the outdoor heat exchanger is connected to the first valve through a second valve.

3. A control method for a heat recovery air conditioning unit according to claim 1 or 2, characterized in that: include: The first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be closed and the second solenoid valve is controlled to be opened, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be opened, and the heat recovery air conditioning unit enters the first working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valves of all the hot and cold switching subunits are controlled to be opened and the second switching valves of all the hot and cold switching subunits are controlled to be closed, and the heat recovery air conditioning unit enters the second working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air conditioning unit enters the third working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air-conditioning unit enters the fourth working mode.

4. The control method of the heat recovery air conditioning unit according to claim 3, characterized in that: When one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, the other end of the outdoor heat exchanger is connected to the first valve through a second valve, and the outdoor unit includes a plurality of circulation pipelines, the method further includes: Control the first port and the third port, and the second port and the fourth port of the four-way valve on at least one of the circulation pipelines to be connected, control the first solenoid valve to be opened and the second solenoid valve to be closed, control the second valve to be closed, control the first switching valve of a part of the hot and cold switching subunits to be opened and the second switching valve to be closed, and control the first switching valve of another part of the hot and cold switching subunits to be closed and the second switching valve to be opened, then the heat recovery air-conditioning unit enters the fifth working mode.

5. The control method of the heat recovery air conditioning unit according to claim 3, characterized in that: When one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, wherein the first valve connected to the water-cooled indoor heat exchanger is a water-cooled valve, the method further includes: Within a predetermined time period of running any working mode, the outdoor unit capacity of the outdoor unit, the indoor unit parameters of each indoor unit with an air-cooled indoor heat exchanger, and the preset initial opening of the water-cooled valve in each indoor unit with a water-cooled indoor heat exchanger are obtained; wherein the indoor unit parameters include: indoor unit capacity, indoor unit set temperature, and indoor unit return air temperature; Calculating the difference between the indoor unit set temperature and the indoor unit return air temperature in each indoor unit with an air-cooled indoor heat exchanger as the return air temperature difference corresponding to the air-cooled indoor heat exchanger; Determining the target opening of the first target water-cooled valve according to the capacity of the outdoor unit, the return air temperature difference corresponding to each air-cooled indoor heat exchanger, the capacity of each indoor unit corresponding to the air-cooled indoor heat exchanger, and the first preset initial opening of the first target water-cooled valve connected to the first target water-cooled indoor heat exchanger in the first target indoor unit; wherein the first target indoor unit is any one of the indoor units with water-cooled indoor heat exchangers; The first target water-cooling valve is controlled to open at the target opening degree.

6. The control method of the heat recovery air conditioning unit according to claim 5, characterized in that: The method of determining the target opening of the first target water-cooled valve connected to the water-cooled indoor heat exchanger in the first target indoor unit according to the outdoor unit capacity, the return air temperature difference corresponding to each air-cooled indoor heat exchanger, and the capacity of each indoor unit corresponding to the air-cooled indoor heat exchanger comprises: The target opening is calculated according to the following formula: Among them, EVW is the target opening, EVW_S is the preset initial opening of the first target water-cooled valve, Hpo is the outdoor unit capacity, Hpi(k) is the indoor unit capacity of the kth indoor unit with an air-cooled indoor heat exchanger, wherein m≥k≥1, m≥1, k, m are integers; ΔTh(k) is the return air temperature difference of the kth indoor unit with an air-cooled indoor heat exchanger.

7. The control method of the heat recovery air conditioning unit according to claim 4, characterized in that: When one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, wherein the first valve connected to the water-cooled indoor heat exchanger is a water-cooled valve, the method further includes: When any working mode is operated for more than a predetermined time, the current exhaust pressure of the compressor, the preset target exhaust pressure, the set temperature of the indoor heat exchanger in the second target indoor unit, the outlet water temperature and the return water temperature are obtained at every preset period; wherein the second target indoor unit is any indoor unit with a water-cooled indoor heat exchanger; determining a target temperature difference of the water-cooled indoor heat exchanger in the second target indoor unit according to the current exhaust pressure, the preset target exhaust pressure, and the set temperature; Calculate the difference between the outlet water temperature and the target temperature difference, and use the difference result as the outlet and return water temperature difference; The second water-cooling valve connected to the water-cooled indoor heat exchanger in the second target indoor unit is controlled according to the outlet and return water temperature difference and the target temperature difference.

8. The heat recovery air conditioning unit control method according to claim 7, characterized in that: The method of controlling the second water-cooled valve connected to the water-cooled indoor heat exchanger in the second target indoor unit according to the outlet and return water temperature difference and the target temperature difference comprises: When it is determined that the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is less than or equal to the first target temperature difference of the second target indoor unit, the second outlet and return water temperature difference, the second target temperature difference, and the first opening degree of the water cooling valve of the second target indoor unit in the n-1th cycle are obtained; wherein n≥2 and n is an integer; Calculating a first difference between the first target temperature difference and the first outlet and return water temperature difference, and calculating a second difference between the second target temperature difference and the second outlet and return water temperature difference; Calculating the second opening of the water-cooling valve in the nth cycle according to the first difference, the second difference and the first opening of the water-cooling valve; The second water cooling valve is controlled to open at the second opening degree of the water cooling valve.

9. The control method of the heat recovery air conditioning unit according to claim 7, characterized in that: The method of controlling the second water-cooled valve connected to the water-cooled indoor heat exchanger in the second target indoor unit according to the outlet and return water temperature difference and the target temperature difference comprises: When it is determined that the first outlet and return water temperature difference of the second target indoor unit in the nth cycle is greater than the first target temperature difference of the second target indoor unit in the nth cycle, the second water cooling valve is closed.

10. The control method of the heat recovery air conditioning unit according to claim 8, characterized in that: The calculating the second opening of the water cooling valve in the nth cycle according to the first difference, the second difference and the first opening of the water cooling valve comprises: The second opening of the water cooling valve is calculated according to the following formula: EVW(n)=EVW(n-1)+kp×{dThw(n)-dThw(n-1)}+ki×dThw(n); Among them, EVW(n) is the second opening of the water cooling valve, EVW(n-1) is the first opening of the water cooling valve, dThw(n) is the first difference, dThw(n-1) is the second difference, kp and ki are control constants.

11. A control device for a heat recovery air conditioning unit according to claim 1 or 2, characterized in that: include: Working mode control module, used for: The first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be closed and the second solenoid valve is controlled to be opened, the first switching valves of all the cold and hot switching subunits are controlled to be opened and the second switching valves of all the cold and hot switching subunits are controlled to be opened, and the heat recovery air conditioning unit enters the first working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valves of all the hot and cold switching subunits are controlled to be opened and the second switching valves of all the hot and cold switching subunits are controlled to be closed, and the heat recovery air conditioning unit enters the second working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the second port, the third port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air conditioning unit enters the third working mode; Alternatively, the first port of the four-way valve is controlled to be connected to the third port, the second port of the four-way valve is controlled to be connected to the fourth port, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, the first switching valve of a part of the hot and cold switching subunits is controlled to be opened and the second switching valve is controlled to be closed, and the first switching valve of another part of the hot and cold switching subunits is controlled to be closed and the second switching valve is controlled to be opened, then the heat recovery air-conditioning unit enters the fourth working mode.

12. The control device for a heat recovery air conditioning unit according to claim 11, characterized in that: When one end of the indoor heat exchanger is connected to the other end of the outdoor heat exchanger through a first valve, the other end of the outdoor heat exchanger is connected to the first valve through a second valve, and the outdoor unit includes a plurality of circulation pipelines, the working mode control module is further used to: Control the first port and the third port, and the second port and the fourth port of the four-way valve on at least one of the circulation pipelines to be connected, control the first solenoid valve to be opened and the second solenoid valve to be closed, control the second valve to be closed, control the first switching valve of a part of the hot and cold switching subunits to be opened and the second switching valve to be closed, and control the first switching valve of another part of the hot and cold switching subunits to be closed and the second switching valve to be opened, then the heat recovery air-conditioning unit enters the fifth working mode.

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