Multi-system collaborative defrosting air source heat pump unit and air conditioning system

Abstract

The utility model discloses a multi-system collaborative defrosting air source heat pump unit and an air conditioning system, and the heat pump unit comprises a first refrigerant circulating system and a second refrigerant circulating system, each of the first refrigerant circulating system and the second refrigerant circulating system comprises an evaporator, a compressor, a shell-and-tube heat exchanger, an electronic expansion valve, a one-way valve, an economizer, a three-way valve, an electromagnetic valve, a gas-liquid separator and a liquid reservoir. The evaporator is formed by connecting fins of a first V-shaped fin heat exchanger and a second V-shaped fin heat exchanger in parallel, each fin of the V-shaped fin heat exchangers is connected with a three-way valve in series, and independent switching control over the refrigerating mode, the heating mode and the defrosting mode of each fin heat exchanger is achieved. The water side shell-and-tube heat exchanger is connected with the fin type heat exchanger in parallel, and uninterrupted heating is achieved while defrosting is achieved. The heat pump unit can achieve four operation modes of refrigeration operation, heating operation, defrosting operation of the first V-shaped fin heat exchanger and defrosting operation of the second V-shaped fin heat exchanger through the control system.

Description

Technical Field

[0001] The utility model relates to the field of heat pumps, in particular to an air source heat pump unit and an air conditioning system for multi-system coordinated defrosting. Background Art

[0002] Air source heat pump heating technology has the advantages of high efficiency and energy saving. Among them, the large vortex multi-system collaborative defrosting air source heat pump unit is composed of multiple independent refrigerant systems. Each refrigeration system is equipped with a set of V-shaped fin heat exchangers. The unit has the advantages of flexible combination, small footprint, and high partial load efficiency. It has been popular in the market in recent years. However, when it is operated in a low temperature and high humidity environment, frost is very easy to form on the fin heat exchanger, resulting in a decrease in the heating performance of the unit, and even shutdown in severe cases, so defrosting is required. Traditional defrosting technologies include reverse cycle defrosting, phase change heat storage defrosting, electric heating defrosting, etc., all of which require shutdown for defrosting, or even reverse cooling, resulting in a decrease in the effective heating capacity of the unit, reduced energy efficiency, and poor comfort. Hot gas bypass defrosting has problems such as insufficient refrigerant flow, too low suction pressure, and long defrosting time. Utility Model Content

[0003] The purpose of the invention of the utility model is to provide an air source heat pump unit and an air conditioning system with multi-system coordinated defrosting in view of the problems existing in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An air source heat pump unit with multi-system coordinated defrosting comprises a first refrigerant circulation system and a second refrigerant circulation system.

[0006] The first refrigerant cycle system includes a first evaporator, a first compressor, a shell and tube heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, a seventh check valve, a first economizer, a first three-way valve, a second three-way valve, a third three-way valve, a first solenoid valve, a first gas-liquid separator, and a first liquid storage tank. The first evaporator is composed of a first V-shaped fin heat exchanger and a second V-shaped fin heat exchanger with left fins connected in parallel, the left fin of the first V-shaped fin heat exchanger is connected in series with the second three-way valve, the left fin of the second V-shaped fin heat exchanger is connected in series with the third three-way valve, and the left fins of the first V-shaped fin heat exchanger and the second V-shaped fin heat exchanger are respectively connected in parallel with the shell and tube heat exchanger;

[0007] The second refrigerant circulation system includes a second evaporator, a second compressor, a shell and tube heat exchanger, a third electronic expansion valve, a fourth electronic expansion valve, an eighth one-way valve, a ninth one-way valve, a tenth one-way valve, an eleventh one-way valve, a twelfth one-way valve, a thirteenth one-way valve, a fourteenth one-way valve, a second economizer, a fourth three-way valve, a fifth three-way valve, a sixth three-way valve, a second solenoid valve, a second gas-liquid separator, and a second liquid storage tank. The second evaporator is composed of a first V-shaped fin heat exchanger and a second V-shaped fin heat exchanger with right fins connected in parallel, the right fin of the first V-shaped fin heat exchanger is connected in series with the fifth three-way valve, the right fin of the second V-shaped fin heat exchanger is connected in series with the fourth three-way valve, and the right fins of the first V-shaped fin heat exchanger and the second V-shaped fin heat exchanger are respectively connected in parallel with the shell and tube heat exchanger.

[0008] As a preferred embodiment of the utility model, under refrigeration conditions, the first compressor is connected to the left fin of the first V-shaped fin heat exchanger through the second three-way valve, the first compressor is connected to the left fin of the second V-shaped fin heat exchanger through the third three-way valve, the left fin of the first V-shaped fin heat exchanger is connected to the first economizer through the fourth one-way valve and the third one-way valve, the left fin of the second V-shaped fin heat exchanger is connected to the first economizer through the fifth one-way valve and the third one-way valve, the first economizer is connected to the air supply port of the first compressor, the two interfaces of the first economizer are respectively connected to the first electronic expansion valve and the second electronic expansion valve, the second electronic expansion valve is connected to one interface of the first liquid reservoir through the first one-way valve, the other interface of the first liquid reservoir is connected to the shell and tube heat exchanger, and the shell and tube heat exchanger is connected to the first compressor through the first three-way valve and the first gas-liquid separator.

[0009] As a preferred embodiment of the utility model, under refrigeration conditions, the second compressor is connected to the right side fin of the first V-shaped fin heat exchanger through the fifth three-way valve, the second compressor is connected to the right side fin of the second V-shaped fin heat exchanger through the fourth three-way valve, the right side fin of the first V-shaped fin heat exchanger is connected to the second economizer through the eleventh one-way valve and the twelfth one-way valve, the right side fin of the second V-shaped fin heat exchanger is connected to the second economizer through the tenth one-way valve and the twelfth one-way valve, the second economizer is connected to the air supply port of the second compressor, the two interfaces of the second economizer are respectively connected to the third electronic expansion valve and the fourth electronic expansion valve, the third electronic expansion valve is connected to one interface of the second liquid reservoir through the fourteenth one-way valve, the other interface of the second liquid reservoir is connected to the shell and tube heat exchanger, and the shell and tube heat exchanger is connected to the second compressor through the sixth three-way valve and the second gas-liquid separator.

[0010] As a preferred embodiment of the utility model, under heating conditions, the first compressor is connected to the shell and tube heat exchanger through the first three-way valve, the shell and tube heat exchanger is connected to the first economizer through the first liquid reservoir and the second one-way valve, the first economizer is connected to the air supply port of the first compressor, the two interfaces of the first economizer are respectively connected to the first electronic expansion valve and the second electronic expansion valve, the second electronic expansion valve is connected to the left fin of the first V-shaped fin heat exchanger through the sixth one-way valve, the second electronic expansion valve is connected to the left fin of the second V-shaped fin heat exchanger through the seventh one-way valve, the left fin of the first V-shaped fin heat exchanger is connected to the first gas-liquid separator through the second three-way valve, the left fin of the second V-shaped fin heat exchanger is connected to the first gas-liquid separator through the third three-way valve, and the first gas-liquid separator is connected to the first compressor.

[0011] As a preferred embodiment of the utility model, under heating conditions, the second compressor is connected to the shell and tube heat exchanger through the sixth three-way valve, the shell and tube heat exchanger is connected to the second economizer through the second liquid reservoir and the thirteenth one-way valve, the second economizer is connected to the air supply port of the second compressor, the two interfaces of the second economizer are respectively connected to the third electronic expansion valve and the fourth electronic expansion valve, the third electronic expansion valve is connected to the right side fin of the first V-shaped fin heat exchanger through the ninth one-way valve, the third electronic expansion valve is connected to the right side fin of the second V-shaped fin heat exchanger through the eighth one-way valve, the right side fin of the first V-shaped fin heat exchanger is connected to the second gas-liquid separator through the fifth three-way valve, the right side fin of the second V-shaped fin heat exchanger is connected to the second gas-liquid separator through the fourth three-way valve, and the second gas-liquid separator is connected to the second compressor.

[0012] As a preferred embodiment of the present utility model, in the defrosting condition of the first V-shaped fin heat exchanger, the first compressor is connected to the shell and tube heat exchanger through the first three-way valve, the shell and tube heat exchanger is connected to the first economizer through the first liquid reservoir and the second one-way valve, the two interfaces of the first economizer are respectively connected to the first electronic expansion valve and the second electronic expansion valve, the second electronic expansion valve is connected to the seventh one-way valve, the first economizer is connected to the air supply port of the first compressor, the first compressor is connected to the left fin of the first V-shaped fin heat exchanger through the second three-way valve, the left fin of the first V-shaped fin heat exchanger is connected to the seventh one-way valve through the fourth one-way valve and the first solenoid valve, the seventh one-way valve is connected to the left fin of the second V-shaped fin heat exchanger, and the left fin of the second V-shaped fin heat exchanger is connected to the first compressor through the third three-way valve and the first gas-liquid separator.

[0013] As a preferred embodiment of the present utility model, under the defrosting condition of the first V-shaped fin heat exchanger, the second compressor is connected to the shell and tube heat exchanger through the sixth three-way valve, the shell and tube heat exchanger is connected to the second economizer through the second liquid reservoir and the thirteenth one-way valve, the two interfaces of the second economizer are respectively connected to the third electronic expansion valve and the fourth electronic expansion valve, the third electronic expansion valve is connected to the eighth one-way valve, the second economizer is connected to the air supply port of the second compressor, the second compressor is connected to the right side fin of the first V-shaped fin heat exchanger through the fifth three-way valve, the right side fin of the first V-shaped fin heat exchanger is connected to the eighth one-way valve through the eleventh one-way valve and the second solenoid valve, the eighth one-way valve is connected to the right side fin of the second V-shaped fin heat exchanger, and the right side fin of the second V-shaped fin heat exchanger is connected to the second compressor through the fourth three-way valve and the second gas-liquid separator.

[0014] As a preferred embodiment of the present utility model, in the defrosting condition of the second V-shaped fin heat exchanger, the first compressor is connected to the shell and tube heat exchanger through the first three-way valve, the shell and tube heat exchanger is connected to the first economizer through the first liquid reservoir and the second one-way valve, the two interfaces of the first economizer are respectively connected to the first electronic expansion valve and the second electronic expansion valve, the second electronic expansion valve is connected to the sixth one-way valve, the first economizer is connected to the air supply port of the first compressor, the first compressor is connected to the left fin of the second V-shaped fin heat exchanger through the third three-way valve, the left fin of the second V-shaped fin heat exchanger is connected to the sixth one-way valve through the fifth one-way valve and the first solenoid valve, the sixth one-way valve is connected to the left fin of the first V-shaped fin heat exchanger, and the left fin of the first V-shaped fin heat exchanger is connected to the first compressor through the second three-way valve and the first gas-liquid separator.

[0015] As a preferred embodiment of the present utility model, in the defrosting condition of the second V-shaped fin heat exchanger, the second compressor is connected to the shell and tube heat exchanger through the sixth three-way valve, the shell and tube heat exchanger is connected to the second economizer through the second liquid reservoir and the thirteenth one-way valve, the two interfaces of the second economizer are respectively connected to the third electronic expansion valve and the fourth electronic expansion valve, the third electronic expansion valve is connected to the ninth one-way valve, the second economizer is connected to the air supply port of the second compressor, the second compressor is connected to the right side fin of the second V-shaped fin heat exchanger through the fourth three-way valve, the right side fin of the second V-shaped fin heat exchanger is connected to the ninth one-way valve through the tenth one-way valve and the second solenoid valve, the ninth one-way valve is connected to the right side fin of the first V-shaped fin heat exchanger, and the right side fin of the first V-shaped fin heat exchanger is connected to the second compressor through the fifth three-way valve and the second gas-liquid separator.

[0016] As a preferred solution of the present invention, the three-way valve can be replaced by three solenoid valves.

[0017] The utility model also discloses an air conditioning system, comprising any of the above-mentioned multi-system collaborative defrosting air source heat pump units.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] Each refrigerant system of the heat pump unit of the utility model realizes independent switching control of cooling, heating and defrosting modes of each fin heat exchanger by connecting a defrosting three-way valve in series at the outlet of each fin heat exchanger. The water-side shell and tube heat exchanger is connected in parallel with the fin heat exchanger to realize uninterrupted heating while defrosting. The heat pump unit of the utility model can realize four operation modes of cooling operation, heating operation, defrosting operation of the first V-shaped fin heat exchanger, and defrosting operation of the second V-shaped fin heat exchanger through the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a system principle diagram of the heat pump unit described in the utility model.

[0021] Figure 2 It is an operating principle diagram of the heat pump unit described in the utility model in refrigeration conditions.

[0022] Figure 3 It is an operating principle diagram of the heat pump unit described in the utility model in heating conditions.

[0023] Figure 4 It is an operating principle diagram of the heat pump unit described in the utility model in the defrosting condition of the first V-shaped fin heat exchanger.

[0024] Figure 5 It is an operating principle diagram of the heat pump unit described in the utility model in the defrosting condition of the second V-shaped fin heat exchanger.

[0025] Markings in the figure: first compressor 1-1, second compressor 1-2, shell and tube heat exchanger 2, first electronic expansion valve 3-1, second electronic expansion valve 3-2, third electronic expansion valve 3-3, fourth electronic expansion valve 3-4, first check valve 4-1, second check valve 4-2, third check valve 4-3, fourth check valve 4-4, fifth check valve 4-5, sixth check valve 4-6, seventh check valve 4-7, eighth check valve 4-8, ninth check valve 4-9, tenth check valve 4-10, eleventh check valve Valve 4-11, the twelfth one-way valve 4-12, the thirteenth one-way valve 4-13, the fourteenth one-way valve 4-14, the first economizer 5-1, the second economizer 5-2, the first three-way valve 7-1, the second three-way valve 7-2, the third three-way valve 7-3, the fourth three-way valve 7-4, the fifth three-way valve 7-5, the sixth three-way valve 7-6, the first solenoid valve 8-1, the second solenoid valve 8-2, the first gas-liquid separator 9-1, the second gas-liquid separator 9-2, the first liquid reservoir 10-1, and the second liquid reservoir 10-2. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0027] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product / equipment / device of the utility model when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0029] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0030] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0031] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0032] Example 1

[0033] like Figure 1 As shown, a multi-system collaborative defrosting air source heat pump unit includes a first refrigerant circulation system and a second refrigerant circulation system.

[0034] The first refrigerant circulation system includes a first evaporator, a first compressor 1-1, a shell and tube heat exchanger 2, a first electronic expansion valve 3-1, a second electronic expansion valve 3-2, a first check valve 4-1, a second check valve 4-2, a third check valve 4-3, a fourth check valve 4-4, a fifth check valve 4-5, a sixth check valve 4-6, a seventh check valve 4-7, a first economizer 5-1, a first three-way valve 7-1, a second three-way valve 7-2, a third three-way valve 7-3, a first solenoid valve 8-1, a first gas-liquid separation The first evaporator is composed of a first V-shaped fin heat exchanger 6-1 and a left fin of a second V-shaped fin heat exchanger 6-2 connected in parallel, the left fin of the first V-shaped fin heat exchanger 6-1 is connected in series with the second three-way valve 7-2, the left fin of the second V-shaped fin heat exchanger 6-2 is connected in series with the third three-way valve 7-3, and the left fins of the first V-shaped fin heat exchanger 6-1 and the second V-shaped fin heat exchanger 6-2 are respectively connected in parallel with the shell and tube heat exchanger 2;

[0035] The second refrigerant cycle system includes a second evaporator, a second compressor 1-2, a shell and tube heat exchanger 2, a third electronic expansion valve 3-3, a fourth electronic expansion valve 3-4, an eighth one-way valve 4-8, a ninth one-way valve 4-9, a tenth one-way valve 4-10, an eleventh one-way valve 4-11, a twelfth one-way valve 4-12, a thirteenth one-way valve 4-13, a fourteenth one-way valve 4-14, a second economizer 5-2, a fourth three-way valve 7-4, a fifth three-way valve 7-5, a sixth three-way valve 7-6, a second solenoid valve 8-2, a second A gas-liquid separator 9-2, a second liquid storage tank 10-2, and the second evaporator is composed of the right side fins of the first V-shaped fin heat exchanger 6-1 and the second V-shaped fin heat exchanger 6-2 connected in parallel, the right side fin of the first V-shaped fin heat exchanger 6-1 is connected in series with the fifth three-way valve 7-5, and the right side fin of the second V-shaped fin heat exchanger 6-2 is connected in series with the fourth three-way valve 7-4, and the right side fins of the first V-shaped fin heat exchanger 6-1 and the second V-shaped fin heat exchanger 6-2 are respectively connected in parallel with the shell and tube heat exchanger 2.

[0036] The two refrigerant systems circulate independently and together form the smallest module of an air source heat pump unit with dual compressors for efficient defrosting and multi-system coordinated defrosting. One or more modules are combined to form air source heat pump units with multi-system coordinated defrosting of various capacities, such as four compressors, six compressors, eight compressors...

[0037] Each refrigerant system of the unit realizes independent switching control of cooling, heating and defrosting modes of each fin heat exchanger by connecting a defrosting three-way valve in series at the outlet of each fin heat exchanger. The function of the one-way valve 4-4, one-way valve 4-5, one-way valve 4-10, one-way valve 4-11 and solenoid valve 8-1, solenoid valve 8-2 is to reduce the pressure of the defrosted liquid refrigerant in the defrosting mode and pass it into the undefrosted fin heat exchanger for evaporation and heat absorption, so as to realize defrosting by absorbing heat from the outdoor air. The water-side shell and tube heat exchanger is connected in parallel with the fin heat exchanger to realize uninterrupted heating while defrosting. The heat pump unit of the utility model can realize four operating modes through the control system: cooling operation, heating operation, defrosting operation of the first V-shaped fin heat exchanger, and defrosting operation of the second V-shaped fin heat exchanger.

[0038] like Figure 2 As shown, in the refrigeration condition, the first compressor 1-1 is connected to the left fin of the first V-shaped fin heat exchanger 6-1 through the second three-way valve 7-2, the first compressor 1-1 is connected to the left fin of the second V-shaped fin heat exchanger 6-2 through the third three-way valve 7-3, the left fin of the first V-shaped fin heat exchanger 6-1 is connected to the first economizer 5-1 through the fourth one-way valve 4-4 and the third one-way valve 4-3, and the left fin of the second V-shaped fin heat exchanger 6-2 is connected to the first economizer 5-1 through the fourth one-way valve 4-4 and the third one-way valve 4-3. The first economizer 5-1 is connected to the air supply port of the first compressor 1-1, and the two interfaces of the first economizer 5-1 are respectively connected to the first electronic expansion valve 3-1 and the second electronic expansion valve 3-2, the second electronic expansion valve 3-2 is connected to an interface of the first liquid reservoir 10-1 through the first one-way valve 4-1, and the other interface of the first liquid reservoir 10-1 is connected to the shell and tube heat exchanger 2, and the shell and tube heat exchanger 2 is connected to the first compressor 1-1 through the first three-way valve 7-1 and the first gas-liquid separator 9-1.

[0039] like Figure 2As shown, in the refrigeration condition, the second compressor 1-2 is connected to the right fin of the first V-shaped fin heat exchanger 6-1 through the fifth three-way valve 7-5, the second compressor 1-2 is connected to the right fin of the second V-shaped fin heat exchanger 6-2 through the fourth three-way valve 7-4, the right fin of the first V-shaped fin heat exchanger 6-1 is connected to the second economizer 5-2 through the eleventh one-way valve 4-11 and the twelfth one-way valve 4-12, and the right fin of the second V-shaped fin heat exchanger 6-2 is connected to the second economizer 5-2 through the tenth one-way valve 4-10 and the twelfth one-way valve 4-12. The second economizer 5-2 is connected to the air supply port of the second compressor 1-2. The two interfaces of the second economizer 5-2 are respectively connected to the third electronic expansion valve 3-3 and the fourth electronic expansion valve 3-4. The third electronic expansion valve 3-3 is connected to an interface of the second liquid reservoir 10-2 through the fourteenth one-way valve 4-14. The other interface of the second liquid reservoir 10-2 is connected to the shell and tube heat exchanger 2. The shell and tube heat exchanger 2 is connected to the second compressor 1-2 through the sixth three-way valve 7-6 and the second gas-liquid separator 9-2.

[0040] Specifically, during normal refrigeration operation, the E and S ports of the first three-way valve 7-1 and the sixth three-way valve 7-6 of the first refrigerant circulation system are connected, the D and E ports of the second three-way valve 7-2, the third three-way valve 7-3, the fourth three-way valve 7-4 and the fifth three-way valve 7-5 are connected, the first solenoid valve 8-1 and the second solenoid valve 8-2 are closed, the fans of the first fin heat exchanger 6-1 and the second fin heat exchanger 6-2 are turned on, and the system produces cold water for the user through the shell and tube heat exchanger 2. The flow mode of the first refrigerant circulation system is as follows: Figure 2 As shown by the arrows, the high-temperature and high-pressure refrigerant at the outlet of the first compressor 1-1 is divided into two paths, passing through the second three-way valve 7-2 and the third three-way valve 7-3, respectively, and entering the left (L) fin heat exchanger of the two groups of V-shaped fin heat exchangers 6-1 and 6-2 to be condensed into high-pressure liquid refrigerant. Then, it passes through the fourth check valve 4-4 and the fifth check valve 4-5, merges and flows through the third check valve 4-3 to enter the first economizer 5-1. In the first economizer 5-1, it exchanges heat with the liquid refrigerant that returns to the first economizer 5-1 from the first electronic expansion valve 3-1, and then splits into two paths. One path expands and depressurizes through the first electronic expansion valve 3-1, re-enters the first economizer 5-1, exchanges heat with the liquid refrigerant that enters the first economizer 5-1 from the fin heat exchanger, and then enters the air supply port of the first compressor 1-1; the other path expands and depressurizes through the second electronic expansion valve 3-2, passes through the first liquid storage tank 10-1, enters the shell and tube heat exchanger 2 to absorb heat and evaporate, and evaporates into gaseous refrigerant. Then it passes through the first three-way valve 7-1 and the first gas-liquid separator 9-1, and finally returns to the first compressor 1-1 to complete the cycle.

[0041] The flow pattern of the second refrigerant circulation system is the same as that of the first refrigerant circulation system.

[0042] like Figure 3 As shown, in the heating condition, the first compressor 1-1 is connected to the shell and tube heat exchanger 2 through the first three-way valve 7-1, the shell and tube heat exchanger 2 is connected to the first economizer 5-1 through the first liquid reservoir 10-1 and the second one-way valve 4-2, the first economizer 5-1 is connected to the air supply port of the first compressor 1-1, the two interfaces of the first economizer 5-1 are respectively connected to the first electronic expansion valve 3-1 and the second electronic expansion valve 3-2, the second electronic expansion valve 3-2 is connected to the first liquid reservoir 10-1 and the second one-way valve 4-2, and the first economizer 5-1 is connected to the first gas supply port of the first compressor 1-1. The left fin of the first V-shaped fin heat exchanger 6-1 is connected, the second electronic expansion valve 3-2 is connected to the left fin of the second V-shaped fin heat exchanger 6-2 through the seventh one-way valve 4-7, the left fin of the first V-shaped fin heat exchanger 6-1 is connected to the first gas-liquid separator 9-1 through the second three-way valve 7-2, the left fin of the second V-shaped fin heat exchanger 6-2 is connected to the first gas-liquid separator 9-1 through the third three-way valve 7-3, and the first gas-liquid separator 9-1 is connected to the first compressor 1-1.

[0043] like Figure 3 As shown, in the heating condition, the second compressor 1-2 is connected to the shell and tube heat exchanger 2 through the sixth three-way valve 7-6, the shell and tube heat exchanger 2 is connected to the second economizer 5-2 through the second liquid reservoir 10-2 and the thirteenth one-way valve 4-13, the second economizer 5-2 is connected to the air supply port of the second compressor 1-2, the two interfaces of the second economizer 5-2 are respectively connected to the third electronic expansion valve 3-3 and the fourth electronic expansion valve 3-4, the third electronic expansion valve 3-3 is connected to the air supply port of the second compressor 1-2 through the ninth one-way valve 4-9 The right side fin of the first V-shaped fin heat exchanger 6-1 is connected, the third electronic expansion valve 3-3 is connected to the right side fin of the second V-shaped fin heat exchanger 6-2 through the eighth one-way valve 4-8, the right side fin of the first V-shaped fin heat exchanger 6-1 is connected to the second gas-liquid separator 9-2 through the fifth three-way valve 7-5, the right side fin of the second V-shaped fin heat exchanger 6-2 is connected to the second gas-liquid separator 9-2 through the fourth three-way valve 7-4, and the second gas-liquid separator 9-2 is connected to the second compressor 1-2.

[0044] Specifically, during normal heating operation, the D and E ports of the first three-way valve 7-1 and the sixth three-way valve 7-6 of the first refrigerant circulation system are connected, the E and S ports of the second three-way valve 7-2, the third three-way valve 7-3, the fourth three-way valve 7-4, and the fifth three-way valve 7-5 are connected, the first solenoid valve 8-1 and the second solenoid valve 8-2 are closed, the fans of the first fin heat exchanger 6-1 and the second fin heat exchanger 6-2 are turned on, and the system produces hot water for the user through the shell and tube heat exchanger 2. The flow mode of the first refrigerant circulation system is as follows: Figure 3 As shown by the arrow, the high-temperature and high-pressure refrigerant at the outlet of the first compressor 1-1 enters the shell and tube heat exchanger 2 through the first three-way valve 7-1 to be condensed into high-pressure liquid refrigerant, and then enters the first economizer 5-1 through the first liquid storage tank 10-1 and the second one-way valve 4-2. In the first economizer 5-1, it exchanges heat with the liquid refrigerant returning to the first economizer 5-1 from the first electronic expansion valve 3-1, and then divides into two paths. One path is expanded and reduced in pressure by the first electronic expansion valve 3-1, and then re-enters the first economizer 5-1, exchanges heat with the liquid refrigerant entering the first economizer 5-1 from the shell and tube heat exchanger 2, and then enters the air supply port of the first compressor 1-1; the other path of the refrigerant after expansion and reduction in pressure by the second electronic expansion valve 3-2 is again divided into two paths, and passes through the sixth one-way valve 4-6 and the seventh one-way valve 4-7 respectively, and then enters the left fins of the two groups of V-shaped fin heat exchangers 6-1 and 6-2 to absorb heat and evaporate. The evaporated refrigerant passes through the second three-way valve 7-2 and the third three-way valve 7-3 for defrosting, and then merges and flows through the first gas-liquid separator 9-1, and finally returns to the first compressor 1-1 to complete the cycle.

[0045] The flow pattern of the second refrigerant circulation system is the same as that of the first refrigerant circulation system.

[0046] like Figure 4As shown, in the defrosting condition of the first V-shaped fin heat exchanger, the first compressor 1-1 is connected to the shell and tube heat exchanger 2 through the first three-way valve 7-1, the shell and tube heat exchanger 2 is connected to the first economizer 5-1 through the first liquid reservoir 10-1 and the second one-way valve 4-2, the two interfaces of the first economizer 5-1 are respectively connected to the first electronic expansion valve 3-1 and the second electronic expansion valve 3-2, the second electronic expansion valve 3-2 is connected to the seventh one-way valve 4-7, the first economizer 5-1 is connected to the first compressor 1-1 The first compressor 1-1 is connected to the left fin of the first V-type fin heat exchanger 6-1 through the second three-way valve 7-2, the left fin of the first V-type fin heat exchanger 6-1 is connected to the seventh one-way valve 4-7 through the fourth one-way valve 4-4 and the first solenoid valve 8-1, the seventh one-way valve 4-7 is connected to the left fin of the second V-type fin heat exchanger 6-2, and the left fin of the second V-type fin heat exchanger 6-2 is connected to the first compressor 1-1 through the third three-way valve 7-3 and the first gas-liquid separator 9-1.

[0047] like Figure 4 As shown, in the defrosting condition of the first V-shaped fin heat exchanger, the second compressor 1-2 is connected to the shell and tube heat exchanger 2 through the sixth three-way valve 7-6, the shell and tube heat exchanger 2 is connected to the second economizer 5-2 through the second liquid reservoir 10-2 and the thirteenth one-way valve 4-13, the two interfaces of the second economizer 5-2 are respectively connected to the third electronic expansion valve 3-3 and the fourth electronic expansion valve 3-4, the third electronic expansion valve 3-3 is connected to the eighth one-way valve 4-8, and the second economizer 5-2 is connected to the second compressor 1-2 The air supply port of the second compressor 1-2 is connected to the right fin of the first V-type fin heat exchanger 6-1 through the fifth three-way valve 7-5, the right fin of the first V-type fin heat exchanger 6-1 is connected to the eighth one-way valve 4-8 through the eleventh one-way valve 4-11 and the second solenoid valve 8-2, the eighth one-way valve 4-8 is connected to the right fin of the second V-type fin heat exchanger 6-2, and the right fin of the second V-type fin heat exchanger 6-2 is connected to the second compressor 1-2 through the fourth three-way valve 7-4 and the second gas-liquid separator 9-2.

[0048] Specifically, when the first fin heat exchanger 6-1 is defrosting, the D and E ports of the first three-way valve 7-1, the second three-way valve 7-2, the fifth three-way valve 7-5, and the sixth three-way valve 7-6 of the first refrigerant circulation system are connected, the E and S ports of the third three-way valve 7-3 and the fourth three-way valve 7-4 are connected, the first solenoid valve 8-1 and the second solenoid valve 8-2 are opened, the fan of the first fin heat exchanger 6-1 is closed, and the fan of the second fin heat exchanger 6-2 is opened, and the system produces hot water for the user through the shell and tube heat exchanger 2 while defrosting the first fin heat exchanger 6-1. The flow mode of the refrigerant circulation system is as follows: Figure 4 As shown by the arrows, the high-temperature and high-pressure refrigerant at the outlet of the first compressor 1-1 is divided into two parts. One part passes through the first three-way valve 7-1 and enters the shell and tube heat exchanger 2 to be condensed into high-pressure liquid refrigerant, and then passes through the first liquid storage tank 10-1 and the second one-way valve 4-2 to enter the first economizer 5-1. In the first economizer 5-1, it exchanges heat with the liquid refrigerant that returns to the first economizer 5-1 from the first electronic expansion valve 3-1, and then is divided into two paths. One path is expanded and depressurized through the first electronic expansion valve 3-1, and then re-enters the first economizer 5-1, exchanges heat with the liquid refrigerant that enters the first economizer 5-1 from the shell and tube heat exchanger 2, and then enters the air supply port of the first compressor 1-1; the other path is expanded and depressurized through the second electronic expansion valve 3-2. Another part of the high-temperature and high-pressure refrigerant coming out of the first compressor 1-1 passes through the second defrost three-way valve 7-2 and directly enters the left fin of the first fin heat exchanger 6-1 for defrosting. The defrosted refrigerant is blocked by the sixth one-way valve 4-6, and is throttled and reduced in pressure by the fourth one-way valve 4-4 and the first solenoid valve 8-1. After merging with the refrigerant at the outlet of the second electronic expansion valve 3-2, it passes through the seventh one-way valve 4-7 and enters the left fin of the second fin heat exchanger 6-2 to absorb heat and evaporate. The evaporated refrigerant passes through the third defrost three-way valve 7-3 and flows through the first gas-liquid separator 9-1 before returning to the compressor.

[0049] The flow pattern of the second refrigerant circulation system is the same as that of the first refrigerant circulation system.

[0050] At this time, the system and heating mode also follow the reverse Carnot cycle principle to absorb heat from the air. The shell and tube heat exchanger and the fin heat exchanger 6-1 are connected in parallel to form a condenser, and the fin heat exchanger 6-2 is used as an evaporator alone. The system can achieve efficient defrosting and uninterrupted heating at the same time, thereby improving the effective heating capacity of the unit.

[0051] like Figure 5As shown, in the defrosting condition of the second V-shaped fin heat exchanger, the first compressor 1-1 is connected to the shell and tube heat exchanger 2 through the first three-way valve 7-1, the shell and tube heat exchanger 2 is connected to the first economizer 5-1 through the first liquid reservoir 10-1 and the second one-way valve 4-2, the two interfaces of the first economizer 5-1 are respectively connected to the first electronic expansion valve 3-1 and the second electronic expansion valve 3-2, the second electronic expansion valve 3-2 is connected to the sixth one-way valve 4-6, the first economizer 5-1 is connected to the first compressor 1-1 The first compressor 1-1 is connected to the left fin of the second V-type fin heat exchanger 6-2 through the third three-way valve 7-3, the left fin of the second V-type fin heat exchanger 6-2 is connected to the sixth one-way valve 4-6 through the fifth one-way valve 4-5 and the first solenoid valve 8-1, the sixth one-way valve 4-6 is connected to the left fin of the first V-type fin heat exchanger 6-1, and the left fin of the first V-type fin heat exchanger 6-1 is connected to the first compressor 1-1 through the second three-way valve 7-2 and the first gas-liquid separator 9-1.

[0052] like Figure 5 As shown, in the defrosting condition of the second V-shaped fin heat exchanger, the second compressor 1-2 is connected to the shell and tube heat exchanger 2 through the sixth three-way valve 7-6, the shell and tube heat exchanger 2 is connected to the second economizer 5-2 through the second liquid reservoir 10-2 and the thirteenth one-way valve 4-13, the two interfaces of the second economizer 5-2 are respectively connected to the third electronic expansion valve 3-3 and the fourth electronic expansion valve 3-4, the third electronic expansion valve 3-3 is connected to the ninth one-way valve 4-9, the second economizer 5-2 is connected to the second compressor 1- 2, the second compressor 1-2 is connected to the right fin of the second V-type fin heat exchanger 6-2 through the fourth three-way valve 7-4, the right fin of the second V-type fin heat exchanger 6-2 is connected to the ninth one-way valve 4-9 through the tenth one-way valve 4-10 and the second solenoid valve 8-2, the ninth one-way valve 4-9 is connected to the right fin of the first V-type fin heat exchanger 6-1, and the right fin of the first V-type fin heat exchanger 6-1 is connected to the second compressor 1-2 through the fifth three-way valve 7-5 and the second gas-liquid separator 9-2.

[0053] Specifically, when the second fin heat exchanger 6-2 is defrosting, the D and E ports of the first three-way valve 7-1, the third three-way valve 7-3, the fourth three-way valve 7-4, and the sixth three-way valve 7-6 of the first refrigerant circulation system are connected, the E and S ports of the second three-way valve 7-2 and the fifth three-way valve 7-5 are connected, the first solenoid valve 8-1 and the second solenoid valve 8-2 are opened, the fan of the second fin heat exchanger 6-2 is closed, and the fan of the first fin heat exchanger 6-1 is opened, and the system produces hot water for the user through the shell and tube heat exchanger 2 while defrosting the second fin heat exchanger 6-2. The flow mode of the first refrigerant circulation system is as follows: Figure 5 As shown by the arrows, the high-temperature and high-pressure refrigerant at the outlet of the first compressor 1-1 is divided into two parts. One part passes through the first three-way valve 7-1 and enters the shell and tube heat exchanger 2 to be condensed into high-pressure liquid refrigerant, and then passes through the first liquid storage tank 10-1 and the second one-way valve 4-2 to enter the first economizer 5-1. In the first economizer 5-1, it exchanges heat with the liquid refrigerant that returns to the first economizer 5-1 from the first electronic expansion valve 3-1, and then is divided into two paths. One path is expanded and depressurized through the first electronic expansion valve 3-1, and then re-enters the first economizer 5-1, exchanges heat with the liquid refrigerant that enters the first economizer 5-1 from the shell and tube heat exchanger 2, and then enters the air supply port of the first compressor 1-1; the other path is expanded and depressurized through the second electronic expansion valve 3-2. Another part of the high-temperature and high-pressure refrigerant coming out of the first compressor 1-1 directly enters the left fin of the second fin heat exchanger 6-2 for defrosting through the third defrosting three-way valve 7-3. The defrosted refrigerant is blocked by the seventh one-way valve 4-7, and is throttled and reduced in pressure through the fifth one-way valve 4-5 and the first solenoid valve 8-1. After merging with the refrigerant at the outlet of the second electronic expansion valve 3-2, it enters the left fin of the first fin heat exchanger 6-1 through the sixth one-way valve 4-6 to absorb heat and evaporate. The evaporated refrigerant passes through the second defrosting three-way valve 7-2 and flows through the first gas-liquid separator 9-1 before returning to the first compressor 1-1.

[0054] The flow pattern of the second refrigerant circulation system is the same as that of the first refrigerant circulation system.

[0055] As a preferred solution of the present invention, the three-way valve can be replaced by three solenoid valves.

[0056] As a preferred solution of the present invention, the first solenoid valve 8-1 and the second solenoid valve 8-2 can be replaced by electronic expansion valves.

[0057] This embodiment also provides an air-conditioning system, comprising any of the above-mentioned multi-system collaborative defrosting air source heat pump units.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air source heat pump unit with multi-system coordinated defrosting, characterized in that: comprising a first refrigerant circulation system and a second refrigerant circulation system, The first refrigerant circulation system comprises a first evaporator, a first compressor (1-1), a shell and tube heat exchanger (2), a first electronic expansion valve (3-1), a second electronic expansion valve (3-2), a first check valve (4-1), a second check valve (4-2), a third check valve (4-3), a fourth check valve (4-4), a fifth check valve (4-5), a sixth check valve (4-6), a seventh check valve (4-7), a first economizer (5-1), a first three-way valve (7-1), a second three-way valve (7-2), a third three-way valve (7-3), a first solenoid valve (8-1), and a second a gas-liquid separator (9-1), a first liquid storage tank (10-1), the first evaporator being composed of a first V-shaped fin heat exchanger (6-1) and a left fin of a second V-shaped fin heat exchanger (6-2) connected in parallel, the left fin of the first V-shaped fin heat exchanger (6-1) being connected in series with the second three-way valve (7-2), the left fin of the second V-shaped fin heat exchanger (6-2) being connected in series with the third three-way valve (7-3), and the left fins of the first V-shaped fin heat exchanger (6-1) and the second V-shaped fin heat exchanger (6-2) being connected in parallel with the shell and tube heat exchanger (2); The second refrigerant circulation system comprises a second evaporator, a second compressor (1-2), a shell and tube heat exchanger (2), a third electronic expansion valve (3-3), a fourth electronic expansion valve (3-4), an eighth one-way valve (4-8), a ninth one-way valve (4-9), a tenth one-way valve (4-10), an eleventh one-way valve (4-11), a twelfth one-way valve (4-12), a thirteenth one-way valve (4-13), a fourteenth one-way valve (4-14), a second economizer (5-2), a fourth three-way valve (7-4), a fifth three-way valve (7-5), a sixth three-way valve (7-6), a second solenoid valve (8- 2), a second gas-liquid separator (9-2), and a second liquid storage tank (10-2), wherein the second evaporator is composed of the right fins of the first V-shaped fin heat exchanger (6-1) and the second V-shaped fin heat exchanger (6-2) connected in parallel, the right fin of the first V-shaped fin heat exchanger (6-1) is connected in series with the fifth three-way valve (7-5), the right fin of the second V-shaped fin heat exchanger (6-2) is connected in series with the fourth three-way valve (7-4), and the right fins of the first V-shaped fin heat exchanger (6-1) and the second V-shaped fin heat exchanger (6-2) are respectively connected in parallel with the shell and tube heat exchanger (2).

2. The multi-system coordinated defrosting air source heat pump unit according to claim 1, characterized in that: In the refrigeration condition, the first compressor (1-1) is connected to the left fin of the first V-shaped fin heat exchanger (6-1) through the second three-way valve (7-2), the first compressor (1-1) is connected to the left fin of the second V-shaped fin heat exchanger (6-2) through the third three-way valve (7-3), the left fin of the first V-shaped fin heat exchanger (6-1) is connected to the first economizer (5-1) through the fourth one-way valve (4-4) and the third one-way valve (4-3), and the left fin of the second V-shaped fin heat exchanger (6-2) is connected to the first economizer (5-1) through the fifth one-way valve (4-5) and the third one-way valve (4-3). The first economizer (5-1) is connected to the air supply port of the first compressor (1-1), the two interfaces of the first economizer (5-1) are respectively connected to the first electronic expansion valve (3-1) and the second electronic expansion valve (3-2), the second electronic expansion valve (3-2) is connected to one interface of the first liquid reservoir (10-1) through the first one-way valve (4-1), the other interface of the first liquid reservoir (10-1) is connected to the shell and tube heat exchanger (2), and the shell and tube heat exchanger (2) is connected to the first compressor (1-1) through the first three-way valve (7-1) and the first gas-liquid separator (9-1).

3. The multi-system coordinated defrosting air source heat pump unit according to claim 2, characterized in that: In the refrigeration condition, the second compressor (1-2) is connected to the right fin of the first V-shaped fin heat exchanger (6-1) through the fifth three-way valve (7-5), the second compressor (1-2) is connected to the right fin of the second V-shaped fin heat exchanger (6-2) through the fourth three-way valve (7-4), the right fin of the first V-shaped fin heat exchanger (6-1) is connected to the second economizer (5-2) through the eleventh one-way valve (4-11) and the twelfth one-way valve (4-12), and the right fin of the second V-shaped fin heat exchanger (6-2) is connected to the second economizer (5-2) through the tenth one-way valve (4-10) and the twelfth one-way valve (4-12). A second economizer (5-2), wherein the second economizer (5-2) is connected to the air supply port of the second compressor (1-2), the two interfaces of the second economizer (5-2) are respectively connected to the third electronic expansion valve (3-3) and the fourth electronic expansion valve (3-4), the third electronic expansion valve (3-3) is connected to one interface of the second liquid reservoir (10-2) via the fourteenth one-way valve (4-14), the other interface of the second liquid reservoir (10-2) is connected to the shell and tube heat exchanger (2), and the shell and tube heat exchanger (2) is connected to the second compressor (1-2) via the sixth three-way valve (7-6) and the second gas-liquid separator (9-2).

4. The multi-system coordinated defrosting air source heat pump unit according to claim 3, characterized in that: In the heating condition, the first compressor (1-1) is connected to the shell and tube heat exchanger (2) through the first three-way valve (7-1), the shell and tube heat exchanger (2) is connected to the first economizer (5-1) through the first liquid storage tank (10-1) and the second one-way valve (4-2), the first economizer (5-1) is connected to the air supply port of the first compressor (1-1), the two interfaces of the first economizer (5-1) are respectively connected to the first electronic expansion valve (3-1) and the second electronic expansion valve (3-2), the second electronic expansion valve (3-2) is connected to the first gas supply port (5-1) through the sixth one-way valve (4-6), and the second gas supply port (5-1) is connected to the first gas supply port (5-1). The left side fin of the first V-shaped fin heat exchanger (6-1) is connected, the second electronic expansion valve (3-2) is connected to the left side fin of the second V-shaped fin heat exchanger (6-2) through the seventh one-way valve (4-7), the left side fin of the first V-shaped fin heat exchanger (6-1) is connected to the first gas-liquid separator (9-1) through the second three-way valve (7-2), the left side fin of the second V-shaped fin heat exchanger (6-2) is connected to the first gas-liquid separator (9-1) through the third three-way valve (7-3), and the first gas-liquid separator (9-1) is connected to the first compressor (1-1).

5. The multi-system coordinated defrosting air source heat pump unit according to claim 4, characterized in that: In the heating condition, the second compressor (1-2) is connected to the shell and tube heat exchanger (2) through the sixth three-way valve (7-6), the shell and tube heat exchanger (2) is connected to the second economizer (5-2) through the second liquid storage tank (10-2) and the thirteenth one-way valve (4-13), the second economizer (5-2) is connected to the air supply port of the second compressor (1-2), the two interfaces of the second economizer (5-2) are respectively connected to the third electronic expansion valve (3-3) and the fourth electronic expansion valve (3-4), the third electronic expansion valve (3-3) is connected to the air supply port of the second compressor (1-2) through the ninth one-way valve (4-9). The right side fin of the first V-shaped fin heat exchanger (6-1) is connected, the third electronic expansion valve (3-3) is connected to the right side fin of the second V-shaped fin heat exchanger (6-2) through the eighth one-way valve (4-8), the right side fin of the first V-shaped fin heat exchanger (6-1) is connected to the second gas-liquid separator (9-2) through the fifth three-way valve (7-5), the right side fin of the second V-shaped fin heat exchanger (6-2) is connected to the second gas-liquid separator (9-2) through the fourth three-way valve (7-4), and the second gas-liquid separator (9-2) is connected to the second compressor (1-2).

6. The multi-system coordinated defrosting air source heat pump unit according to claim 5, characterized in that: In the defrosting condition of the first V-shaped fin heat exchanger, the first compressor (1-1) is connected to the shell and tube heat exchanger (2) through the first three-way valve (7-1), the shell and tube heat exchanger (2) is connected to the first economizer (5-1) through the first liquid reservoir (10-1) and the second one-way valve (4-2), the two interfaces of the first economizer (5-1) are respectively connected to the first electronic expansion valve (3-1) and the second electronic expansion valve (3-2), the second electronic expansion valve (3-2) is connected to the seventh one-way valve (4-7), and the first economizer (5-1) is connected to the first compressor (1-1). The first compressor (1-1) is connected to the left fin of the first V-shaped fin heat exchanger (6-1) through the second three-way valve (7-2), the left fin of the first V-shaped fin heat exchanger (6-1) is connected to the seventh one-way valve (4-7) through the fourth one-way valve (4-4) and the first solenoid valve (8-1), the seventh one-way valve (4-7) is connected to the left fin of the second V-shaped fin heat exchanger (6-2), and the left fin of the second V-shaped fin heat exchanger (6-2) is connected to the first compressor (1-1) through the third three-way valve (7-3) and the first gas-liquid separator (9-1).

7. The multi-system coordinated defrosting air source heat pump unit according to claim 6, characterized in that: In the defrosting condition of the first V-shaped fin heat exchanger, the second compressor (1-2) is connected to the shell and tube heat exchanger (2) through the sixth three-way valve (7-6), the shell and tube heat exchanger (2) is connected to the second economizer (5-2) through the second liquid reservoir (10-2) and the thirteenth one-way valve (4-13), the two interfaces of the second economizer (5-2) are respectively connected to the third electronic expansion valve (3-3) and the fourth electronic expansion valve (3-4), the third electronic expansion valve (3-3) is connected to the eighth one-way valve (4-8), and the second economizer (5-2) is connected to the second compressor (1-2). The second compressor (1-2) is connected to the right fin of the first V-shaped fin heat exchanger (6-1) through the fifth three-way valve (7-5), the right fin of the first V-shaped fin heat exchanger (6-1) is connected to the eighth one-way valve (4-8) through the eleventh one-way valve (4-11) and the second solenoid valve (8-2), the eighth one-way valve (4-8) is connected to the right fin of the second V-shaped fin heat exchanger (6-2), and the right fin of the second V-shaped fin heat exchanger (6-2) is connected to the second compressor (1-2) through the fourth three-way valve (7-4) and the second gas-liquid separator (9-2).

8. The multi-system coordinated defrosting air source heat pump unit according to claim 7, characterized in that: In the defrosting condition of the second V-shaped fin heat exchanger, the first compressor (1-1) is connected to the shell and tube heat exchanger (2) through the first three-way valve (7-1), the shell and tube heat exchanger (2) is connected to the first economizer (5-1) through the first liquid reservoir (10-1) and the second one-way valve (4-2), the two interfaces of the first economizer (5-1) are respectively connected to the first electronic expansion valve (3-1) and the second electronic expansion valve (3-2), the second electronic expansion valve (3-2) is connected to the sixth one-way valve (4-6), and the first economizer (5-1) is connected to the first compressor (1-1). The first compressor (1-1) is connected to the left fin of the second V-shaped fin heat exchanger (6-2) through the third three-way valve (7-3), the left fin of the second V-shaped fin heat exchanger (6-2) is connected to the sixth one-way valve (4-6) through the fifth one-way valve (4-5) and the first solenoid valve (8-1), the sixth one-way valve (4-6) is connected to the left fin of the first V-shaped fin heat exchanger (6-1), and the left fin of the first V-shaped fin heat exchanger (6-1) is connected to the first compressor (1-1) through the second three-way valve (7-2) and the first gas-liquid separator (9-1).

9. The multi-system coordinated defrosting air source heat pump unit according to claim 8, characterized in that: In the defrosting condition of the second V-shaped fin heat exchanger, the second compressor (1-2) is connected to the shell and tube heat exchanger (2) through the sixth three-way valve (7-6), the shell and tube heat exchanger (2) is connected to the second economizer (5-2) through the second liquid reservoir (10-2) and the thirteenth one-way valve (4-13), the two interfaces of the second economizer (5-2) are respectively connected to the third electronic expansion valve (3-3) and the fourth electronic expansion valve (3-4), the third electronic expansion valve (3-3) is connected to the ninth one-way valve (4-9), and the second economizer (5-2) is connected to the second compressor (1-2). The second compressor (1-2) is connected to the right fin of the second V-type fin heat exchanger (6-2) through the fourth three-way valve (7-4), the right fin of the second V-type fin heat exchanger (6-2) is connected to the ninth one-way valve (4-9) through the tenth one-way valve (4-10) and the second solenoid valve (8-2), the ninth one-way valve (4-9) is connected to the right fin of the first V-type fin heat exchanger (6-1), and the right fin of the first V-type fin heat exchanger (6-1) is connected to the second compressor (1-2) through the fifth three-way valve (7-5) and the second gas-liquid separator (9-2).

10. An air conditioning system, characterized in that: It comprises an air source heat pump unit with multi-system coordinated defrosting as described in any one of claims 1-9.

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