A multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit

Abstract

The present invention discloses a multi-circuit heat pump type ventilation heat recovery and air treatment composite integrated unit, which is composed of mutually isolated exhaust ducts, bypass channels and fresh air ducts, wherein the exhaust ducts and the fresh air ducts are arranged on both sides of the bypass channel; a D0 air valve is installed in the middle part of the bypass channel, and D1 air valves and D3 air valves which can be respectively connected / disconnected with the exhaust duct, and D2 air valves and D4 air valves which can be connected / disconnected with the fresh air duct are installed on both sides of the D0 air valve; heat pump heat exchangers are respectively arranged in the exhaust ducts located outside the D3 air valve and the D1 air valve; heat pump heat exchangers are respectively arranged in the fresh air ducts located outside the D2 air valve and the D4 air valve, and heat pump components are connected into two or more independent heat pump circuits; and working modes such as ventilation mode, multi-circuit heat recovery mode, heat recovery and air treatment composite mode, single-circuit heat recovery mode, air treatment mode and air treatment + fresh air mode can be converted through the on / off combination of different air valves.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of building ventilation heat recovery and air treatment equipment, and in particular to a multi-loop heat pump ventilation heat recovery and air treatment composite integrated unit. Background Art

[0002] Creating a comfortable and healthy air environment inside a building or room is one of the basic guarantees necessary for people to live, study and work in modern society, and various air treatment equipment with functions such as temperature control, humidity control, and ventilation are the core technical equipment for creating an indoor environment. However, the creation of a comfortable and healthy indoor air environment not only consumes a lot of energy, but also causes environmental problems such as the greenhouse effect and the heat island effect. In order to effectively reduce the energy consumption of the air treatment link in buildings, people have developed many energy-saving air treatment technologies and equipment, such as new and exhaust ventilation heat recovery equipment, which can transfer the energy in the exhaust air to the fresh air, effectively reducing the energy of fresh air treatment; heat pump air conditioners can make full use of low-grade heat energy in the environment to heat the building in winter and cool the building in summer, which can be used for two purposes and operate efficiently. Among the ventilation heat recovery equipment, the heat pump ventilation heat recovery equipment has a compact structure and high temperature efficiency of heat recovery, and has been widely used in recent years. In order to further improve the energy efficiency of heat pump heat recovery equipment under large temperature difference conditions, Chinese patent ZL 201720269531.X proposes a multi-circuit heat pump system with heat exchange coils stacked in sequence. The heat pump system consists of several independent heat pump circuits, which can make the operating temperature difference of each heat pump circuit less than the maximum temperature difference between the cold and hot fluids. In this way, it not only helps the operating temperature difference of each heat pump circuit to be uniform, but also helps the working fluid to form a temperature gradient that matches the fluid heat exchange temperature difference, effectively reducing heat exchange losses. Compared with the traditional single-circuit heat pump system, the energy efficiency and reliability of the heat pump system are significantly improved.

[0003] However, the above-mentioned multi-circuit heat pump system is mainly used to improve the performance of the heat pump, and building ventilation heat recovery is only one of its application scenarios. No specific technical solution for the multi-circuit heat pump ventilation heat recovery unit is given; in addition, no application scenarios and technical solutions for air treatment are mentioned.

[0004] The purpose of the present invention is to design a multifunctional and efficient indoor environment creation equipment with functions such as heat pump ventilation heat recovery and heat pump air conditioning based on the multi-circuit heat pump system proposed in Patent ZL 201720269531.X, so as to provide energy-saving buildings with a multi-circuit heat pump ventilation heat recovery and air treatment composite integrated unit with a compact structure, significantly improved system operation energy efficiency level and reliability, and capable of operating in multiple working modes.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution of the present invention is a multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit, characterized in that: the integrated unit is composed of mutually isolated exhaust duct 7, bypass duct 11, fresh air duct 15 and heat pump system, the exhaust duct 7 and fresh air duct 15 are arranged on both sides of the bypass duct 11; the heat pump system is arranged in the mutually isolated exhaust duct 7, bypass duct 11 and fresh air duct 15 according to functional requirements, and connected into a whole;

[0006] The two ends of the bypass channel 11 are provided with a C3 connecting air port 22 and a C4 connecting air port 13, the inner side of the C4 connecting air port 13 is provided with a ventilator 12, the middle part of the bypass channel 11 is provided with a D0 air valve 21 for separating the C3 connecting air port and the C4 connecting air port, and the D1 air valve 26 and the D3 air valve 25 which can be connected / disconnected with the exhaust air duct 7 are provided on both sides of the D0 air valve 21, and the D2 air valve 16 and the D4 air valve 17 which can be connected / disconnected with the fresh air duct 15 are provided;

[0007] The exhaust duct 7 is provided with a C1 connecting air port 23 and a C6 connecting air port 10 at both ends, a D6 air valve 8 is provided inside the C1 connecting air port 23, an exhaust fan 9 is provided inside the C6 connecting air port 10, and the first heat pump exhaust heat exchanger 3a and the second heat pump exhaust heat exchanger 3b are respectively arranged in the exhaust duct 7 located outside the D3 air valve 25 and the D1 air valve 26;

[0008] The fresh air duct 15 is provided with a C2 connecting air outlet 14 and a C5 connecting air outlet 20 at both ends, a D5 air valve 18 is provided on the inner side of the C2 connecting air outlet 14, a fresh air fan 19 is provided on the inner side of the C5 connecting air outlet 20, and the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b are respectively arranged in the fresh air duct 15 located outside the D2 air valve 16 and the D4 air valve 17.

[0009] The heat pump system is composed of two or more independent heat pump circuits; each heat pump circuit is composed of a compressor 1, a four-way reversing valve 2, an exhaust heat exchanger 3, a throttling element 4 and a fresh air heat exchanger 5, and the compressor 1, the four-way reversing valve 2, the exhaust heat exchanger 3, the throttling element 4, the fresh air heat exchanger 5 and the four-way reversing valve 2 are sequentially connected to form a closed circuit by a pipeline 6; the exhaust heat exchanger 3 of the heat pump system is placed in the exhaust duct 7, the fresh air heat exchanger 5 is placed in the fresh air duct 15, the compressor 1 and the four-way reversing valve 2 are placed in the bypass channel 11, and the throttling element 4 is placed at the inlet and outlet of the exhaust heat exchanger 3 and the fresh air heat exchanger 5; each independent heat pump closed circuit is nested in sequence.

[0010] When the heat pump closed circuit is double, it includes heat pump circuit a and heat pump circuit b;

[0011] The connection sequence of the heat pump circuit a is as follows: a single interface on one side of the first four-way reversing valve 2a is connected to the exhaust port of the first compressor 1a, a middle interface on the other side of the first four-way reversing valve 2a is connected to the suction port of the first compressor 1a, a left interface on the other side of the first four-way reversing valve 2a is connected to the first heat pump exhaust heat exchanger 3a, a right interface on the other side of the first four-way reversing valve 2a is connected to the first heat pump fresh air heat exchanger 5a, and the first heat pump exhaust heat exchanger 3a is connected to the first heat pump fresh air heat exchanger 5a via the first throttling element 4a;

[0012] The connection order of the heat pump circuit b is: a single interface on one side of the second four-way reversing valve 2b is connected to the exhaust port of the second compressor 1b, the middle interface on the other side of the second four-way reversing valve 2b is connected to the suction port of the second compressor 1b, the left interface on the other side of the second four-way reversing valve 2b is connected to the second heat pump exhaust heat exchanger 3b, the right interface on the other side of the second four-way reversing valve 2b is connected to the second heat pump fresh air heat exchanger 5b, the second heat pump exhaust heat exchanger 3b is connected to the second heat pump fresh air heat exchanger 5b through the second throttling element 4b, and a certain amount of low-boiling-point working medium is filled in the circuit.

[0013] The compressor 1 and the four-way reversing valve 2 can also be placed in the exhaust duct 7 or the fresh air duct 15.

[0014] The integrated unit can switch to the following working modes through the on / off combination of different air valves:

[0015] Ventilation mode: D0 air valve is open, other air valves are closed;

[0016] In multi-circuit heat recovery mode, the D5 and D6 air valves are open, and the other air valves are closed;

[0017] Heat recovery and air treatment composite mode: D1 air valve, D4 ​​air valve, D5 air valve, D6 air valve are open, and other air valves are closed;

[0018] Single-loop heat recovery mode: D2 and D3 air valves are open, and other air valves are closed;

[0019] Air handling mode: D1 air valve and D4 air valve are open, and other air valves are closed;

[0020] Air treatment and fresh air mode: D1 air valve, D4 ​​air valve, and D air valve 0 are open, and other air valves are closed.

[0021] The exhaust duct 7, the bypass duct 11 and the fresh air duct 15 which are isolated from each other are arranged side by side left and right, or arranged side by side up and down, or arranged in a mixed manner up and down and left and right.

[0022] bypass channel 11 can be provided around the first heat pump exhaust heat exchanger 3a and the second heat pump exhaust heat exchanger 3b, the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b to partially realize the function of the bypass channel 11.

[0023] The D0 to D6 air valves and the C1 to C6 connecting air ports in the exhaust duct 7 , the bypass duct 11 and the fresh air duct 15 can be partially omitted.

[0024] The connection sequence of the heat pump circuit a is changed as follows: a single interface on one side of the first four-way reversing valve 2a is connected to the exhaust port of the first compressor 1a, a middle interface on the other side is connected to the suction port of the first compressor 1a, a left interface is connected to the first heat pump exhaust heat exchanger 3a, and a right interface is connected to the first heat pump fresh air heat exchanger 5a. The first heat pump exhaust heat exchanger 3a is connected to the first heat pump fresh air heat exchanger 5a via the first throttling element 4a.

[0025] The connection sequence of the heat pump circuit b is changed as follows: a single interface on one side of the second four-way reversing valve 2b is connected to the exhaust port of the second compressor 1b, a middle interface on the other side is connected to the suction port of the second compressor 1b, a left interface is connected to the second heat pump exhaust heat exchanger 3b, and a right interface is connected to the second heat pump fresh air heat exchanger 5b, and the second heat pump exhaust heat exchanger 3b is connected to the second heat pump fresh air heat exchanger 5b via a second throttling element 4b;

[0026] The compressor 1 is an independent compressor or a compressor group, or a multi-cylinder compressor having independent suction and exhaust cylinders or cylinder groups; or a working fluid pump is used to replace part of the compressor; or a multi-cylinder compressor with part of the cylinders designed as air pumps;

[0027] The heat pump working fluid is R290, R32, R1234yf, R1234ze, R410A, R134a, R407C, R245fa or R411A. Each heat pump circuit is filled with the same working fluid, or different working fluids, or a mixture of several working fluids.

[0028] The compressor or working fluid pump is of piston type, rolling piston type, screw type, scroll type, centrifugal type, sliding vane type or vortex type.

[0029] The multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit designed by the present invention is based on the multi-circuit heat pump system, and organically integrates the functions of heat pump type ventilation heat recovery and heat pump type air conditioning into the multi-circuit heat pump system, giving full play to the advantages of clean, efficient and compact structure of the heat pump, and can combine a variety of different air treatment functions and operation modes. According to the temperature changes throughout the year, the corresponding functions and efficient operation modes are selected, which not only ensures the overall energy efficiency level of the unit throughout the year, but also achieves the purpose of one machine for multiple uses and significant energy saving, thereby providing a new multi-functional and efficient indoor environment creation equipment for energy-saving buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Figure 1 It is a structural principle diagram of the first embodiment of the present invention.

[0032] Figure 2 It is a structural principle diagram of the second embodiment of the present invention.

[0033] Figure 3 It is a structural principle diagram of embodiment 3 of the present invention.

[0034] Figure 4 It is a structural principle diagram of embodiment 4 of the present invention.

[0035] Figure 5 It is a structural principle diagram of embodiment 5 of the present invention.

[0036] Figure 6 It is a structural principle diagram of embodiment 6 of the present invention.

[0037] Description of the numbers in the figure:

[0038] 1—compressor, 2—four-way reversing valve, 3—exhaust heat exchanger, 4—throttling element, 5—fresh air heat exchanger, 6—pipeline, 7—exhaust duct, 8—D6 air valve, 9—exhaust fan, 10—C6 connecting air outlet, 11—bypass channel, 12—ventilator, 13—C4 connecting air outlet, 14—C2 connecting air outlet, 15—fresh air duct, 16—D2 air valve, 17—D4 air valve, 18—D5 air valve, 19— Fresh air fan, 20—C5 connecting air outlet, 21—D0 air valve, 22—C3 connecting air outlet, 23—C1 connecting air outlet, 24—adjustable louver exhaust outlet, 25—D3 air valve, 26—D1 air valve, 27—D0f bypass air valve, 28—D0e bypass air valve, 29—fixed louver fresh air outlet, 30—fresh air valve, 31—middle partition, 32—indoor fan, 33-motor, 34—outdoor fan DETAILED DESCRIPTION

[0039] Embodiment 1

[0040] refer to Figure 1This embodiment is a double-loop heat pump type ventilation heat recovery and air treatment integrated unit, which is mainly used for efficient ventilation and air treatment of buildings or rooms. The integrated unit has mutually isolated exhaust duct 7, bypass duct 11 and fresh air duct 15, wherein the exhaust duct 7 and fresh air duct 15 are arranged on both sides of the bypass duct 11; C3 connecting air port 22 and C4 connecting air port 13 are installed at both ends of the bypass duct 11, and the inner side of the C4 connecting air port 13 is equipped with a ventilator 12, and a D0 air valve 21 is installed in the middle part of the bypass duct 11 to separate C3 and C4, and D1 air valve 26 and D3 air valve 25 that can be connected / disconnected with the exhaust duct 7 are installed on both sides of D0, and D2 air valve 16 and D4 air valve 17 that can be connected / disconnected with the fresh air duct 15 are installed; C1 connecting air port 22 is installed at both ends of the exhaust duct 7. 23 and C6 connecting air outlet 10, D6 air valve 8 is installed on the inner side of C1 connecting air outlet 23, exhaust fan 9 is installed on the inner side of C6 connecting air outlet 10, the first heat pump exhaust heat exchanger 3a and the second heat pump exhaust heat exchanger 3b are respectively arranged in the exhaust duct 7 located outside D3 and D1; C2 connecting air outlet 14 and C5 connecting air outlet 20 are installed at both ends of the fresh air duct 15, D5 air valve 18 is installed on the inner side of C2 connecting air outlet 14, fresh fan 19 is installed on the inner side of C5 connecting air outlet 20, the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b are respectively arranged in the fresh air duct 15 located outside D2 and D4.

[0041] The heat pump system of the composite integrated unit is composed of two independent circuit heat pumps, each heat pump circuit is composed of a compressor 1, a four-way reversing valve 2, an exhaust air heat exchanger 3, a throttling element 4 and a fresh air heat exchanger 5, etc., which are connected in sequence into a closed circuit by a pipeline 6. The connection sequence of heat pump circuit a is: a single interface on one side of four-way reversing valve 2a is connected to the exhaust port of compressor 1a, the middle interface on the other side is connected to the air intake port of compressor 1a, the left interface is connected to the first heat pump exhaust heat exchanger 3a, the right interface is connected to the first heat pump fresh air heat exchanger 5a, and the first heat pump exhaust heat exchanger 3a is connected to the first heat pump fresh air heat exchanger 5a through the throttling element 4a; the connection sequence of heat pump circuit b is: a single interface on one side of four-way reversing valve 2b is connected to the exhaust port of compressor 1b, the middle interface on the other side is connected to the air intake port of compressor 1b, the left interface is connected to the second heat pump exhaust heat exchanger 3b, the right interface is connected to the first heat pump fresh air heat exchanger 5b, and the second heat pump exhaust heat exchanger 3b is connected to the first heat pump fresh air heat exchanger 5b through the throttling element 4b. A certain amount of R32 or R290 is filled in the heat pump circuit.

[0042] The composite integrated unit can convert the following working modes through the on / off combinations of different air valves. Ventilation mode: Valve D0 is open and other valves are closed, enabling the exchange of indoor and outdoor air; Dual-loop heat recovery mode: Valves D5 and D6 are open and other valves are closed, achieving the exchange of indoor and outdoor air while transferring the energy of the exhaust air to the fresh air; Composite mode of heat recovery and air treatment: Valves D1, D4, D5, and D6 are open and other valves are closed, capable of achieving the exchange of indoor and outdoor air with heat recovery and simultaneously heating / cooling part of the indoor air conditioners; Single-loop heat recovery mode: Valves D2 and D3 are open and other valves are closed, using only a single heat pump loop to achieve the exchange of indoor and outdoor air with heat recovery; Air treatment mode: Valves D1 and D4 are open and other valves are closed, enabling the heating / cooling of indoor air conditioners without the exchange of indoor and outdoor air; Air treatment + fresh air mode: Valves D1, D4, and D0 are open and other valves are closed, enabling the heating / cooling of indoor air conditioners under the condition of partial exchange of indoor and outdoor air.

[0043] The conversion logic of the working modes of the composite integrated unit is as follows. Let the exhaust air temperature be TA, the fresh air temperature be TB, and DT = |TA - TB|; T1, T2, and T3 are constants, and T1 < T2 < T3. When DT ≤ T1, the ventilation mode is turned on; when T1 < DT ≤ T2, the heat recovery mode or the composite mode of heat recovery and air treatment is turned on; when T2 < DT ≤ T3, the composite mode of heat recovery and air treatment is turned on; when DT > T3, the air treatment mode or the air treatment + fresh air mode is turned on. T1, T2, and T3 can be selected through analysis and comparison according to the climate characteristics of the usage area. For example, in the Beijing area, T1, T2, and T3 can be selected as 5, 10, 30, etc.

[0044] The compressor 1 is a double-cylinder rolling piston compressor, where 1a is the air pump cylinder and 1b is the compression cylinder.

[0045] Embodiment 2

[0046] Reference Figure 2 , this embodiment is a dual-loop heat pump type ventilation heat recovery and air treatment composite integrated unit that is more suitable for use in the Yellow River Basin and the middle and lower reaches of the Yangtze River, mainly used for efficient ventilation and air treatment of buildings or rooms. Compared with Embodiment 1, the D2 valve 16 and the D3 valve 25 in the bypass channel 11 are omitted, and the single-loop heat recovery mode cannot be achieved; the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b in the fresh air duct 15 are exchanged in position relative to the flow direction of fluid B, that is, the original first heat pump fresh air heat exchanger 5a contacting fluid B first and the second heat pump fresh air heat exchanger 5b contacting fluid B later are changed to the second heat pump fresh air heat exchanger 5b contacting fluid B first and the first heat pump fresh air heat exchanger 5a contacting fluid B later; the compressor 1 is a double-cylinder rolling piston compressor, where both 1a and 1b are compression cylinders; a certain amount of R410A is filled in the loop.

[0047] Embodiment 3

[0048] refer to Figure 3 This embodiment is a double-loop heat pump ventilation heat recovery unit, which is mainly used for efficient ventilation of buildings or rooms. Compared with the first embodiment, the bypass channel 11 and the D1-D4 air valves, the fan 12 and the C3, C4 connecting air ports thereon are omitted, and at the same time, the D0e bypass air valve 28 and the D0f bypass air valve 27 are respectively arranged at appropriate places around the first heat pump exhaust air heat exchanger 3a and the second heat pump exhaust air heat exchanger 3b of the exhaust duct 7, and the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b of the fresh air duct 15, or only one of the two air valves can be arranged.

[0049] Embodiment 4

[0050] refer to Figure 4 This embodiment is a double-circuit heat pump type ventilation heat recovery and air handling integrated unit with simplified functions, which is mainly used for efficient ventilation and air handling of buildings or rooms. Compared with the first embodiment, the C3 and C4 connecting air ports of the bypass channel 11 are omitted and shared with the C1 and C2 connecting air ports respectively; at the same time, the ventilator 12 and the D2 and D3 air valves are omitted, and the D0 air valve is set at a suitable place around the first heat pump fresh air heat exchanger 5a and the second heat pump fresh air heat exchanger 5b of the fresh air duct 15, and can also be set at a suitable place around the first heat pump exhaust air heat exchanger 3a and the second heat pump exhaust air heat exchanger 3b of the exhaust duct 7. In this way, the integrated unit can only realize the ventilation mode, the multi-circuit heat pump heat recovery mode, and the heat recovery and air handling composite mode.

[0051] Embodiment 5

[0052] refer to Figure 5 This embodiment is a single-circuit heat pump type ventilation heat recovery and air treatment integrated unit, which is mainly used for efficient ventilation and air treatment of buildings or rooms. Compared with the fourth embodiment, there is only one heat pump circuit, and the compressor adopts an ordinary single suction and exhaust compressor, and the rest of the parts remain unchanged.

[0053] Embodiment 6

[0054] refer to Figure 6, this embodiment is a window-type integrated air-conditioning unit with ventilation heat recovery, which is mainly used for room air conditioning and high-efficiency fresh air ventilation. Compared with the fifth embodiment, the exhaust duct and the fresh air duct are arranged on both sides of the unit box, the port of the exhaust duct communicating with the indoor room is equipped with an adjustable louver exhaust vent 24, and the other end of the exhaust duct faces part of the heat exchange coil of the exhaust heat exchanger 3; the fixed louver fresh air vent 29 is opened on the side wall of the unit box, one end of the fresh air duct is located near the fixed louver fresh air vent 29 and is equipped with a fresh air valve 30, and the other end of the fresh air duct faces part of the heat exchange coil of the fresh air heat exchanger 5; the main parts of the exhaust heat exchanger 3 and the fresh air heat exchanger 5 are located in the middle of the box and are placed opposite to each other, and the middle partition 31 is located therebetween and blocks the air passage; the indoor fan 32 and the outdoor fan 34 are located on both sides of the middle partition 31 and are driven by a motor 33; the upper part of the windward surface of the fresh air heat exchanger 5 is provided with an indoor air outlet; the heat pump is a single-circuit heat pump system, and the connection sequence is the same as that of the fifth embodiment. The working fluid is R290. When the adjustable louvered air outlet 24 and the fresh air valve 30 are closed, the unit only processes indoor air; when the adjustable louvered air outlet 24 and the fresh air valve 30 are opened, the unit processes indoor air while performing fresh exhaust air ventilation heat recovery.

Claims

1. A multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit, characterized in that: The composite integrated unit is composed of mutually isolated exhaust ducts (7), bypass ducts (11), fresh air ducts (15), and a heat pump system. The exhaust ducts (7) and fresh air ducts (15) are arranged on both sides of the bypass duct (11); the heat pump system is arranged in the mutually isolated exhaust ducts (7), bypass ducts (11), and fresh air ducts (15) according to functional requirements, and are connected into a whole. A C3 connecting air port (22) and a C4 connecting air port (13) are installed at both ends of the bypass channel (11), a ventilator (12) is installed inside the C4 connecting air port (13), a D0 air valve (21) is installed in the middle of the bypass channel (11) to separate the C3 connecting air port from the C4 connecting air port, and a D1 air valve (26) and a D3 air valve (25) are installed on both sides of the D0 air valve (21) to be able to connect / disconnect with the exhaust air duct (7), and a D2 air valve (16) and a D4 air valve (17) to be able to connect / disconnect with the fresh air duct (15); A C1 connecting air port (23) and a C6 connecting air port (10) are installed at both ends of the exhaust duct (7); a D6 air valve (8) is installed on the inner side of the C1 connecting air port (23); an exhaust fan (9) is installed on the inner side of the C6 connecting air port (10); and a first heat pump exhaust heat exchanger (3a) and a second heat pump exhaust heat exchanger (3b) are respectively arranged in the exhaust duct (7) outside the D3 air valve (25) and the D1 air valve (26); A C2 connecting air port (14) and a C5 connecting air port (20) are installed at both ends of the fresh air duct (15); a D5 air valve (18) is installed on the inner side of the C2 connecting air port (14); a fresh air fan (19) is installed on the inner side of the C5 connecting air port (20); and a first heat pump fresh air heat exchanger (5a) and a second heat pump fresh air heat exchanger (5b) are respectively arranged in the fresh air duct (15) located outside the D2 air valve (16) and the D4 air valve (17); The heat pump system is composed of two independent heat pump circuits; each heat pump circuit is composed of a compressor (1), a four-way reversing valve (2), an exhaust heat exchanger (3), a throttling element (4) and a fresh air heat exchanger (5); the compressor (1), the four-way reversing valve (2), the exhaust heat exchanger (3), the throttling element (4), the fresh air heat exchanger (5) and the four-way reversing valve (2) are sequentially connected by a pipeline (6) to form a closed circuit; the exhaust heat exchanger (3) of the heat pump system is placed in an exhaust duct (7), the fresh air heat exchanger (5) is placed in a fresh air duct (15), the compressor (1) and the four-way reversing valve (2) are placed in a bypass channel (11), and the throttling element (4) is placed at the inlet and outlet of the exhaust heat exchanger (3) and the fresh air heat exchanger (5); each independent heat pump closed circuit is nested in sequence; The dual independent heat pump closed circuits include heat pump circuit a and heat pump circuit b; The connection sequence of the heat pump circuit a is as follows: a single interface on one side of the first four-way reversing valve (2a) is connected to the exhaust port of the first compressor (1a), a middle interface on the other side of the first four-way reversing valve (2a) is connected to the suction port of the first compressor (1a), a left interface on the other side of the first four-way reversing valve (2a) is connected to the first heat pump exhaust heat exchanger (3a), a right interface on the other side of the first four-way reversing valve (2a) is connected to the first heat pump fresh air heat exchanger (5a), and the first heat pump exhaust heat exchanger (3a) is connected to the first heat pump fresh air heat exchanger (5a) via a first throttling element (4a); The connection sequence of the heat pump circuit b is as follows: a single interface on one side of the second four-way reversing valve (2b) is connected to the exhaust port of the second compressor (1b), a middle interface on the other side of the second four-way reversing valve (2b) is connected to the suction port of the second compressor (1b), a left interface on the other side of the second four-way reversing valve (2b) is connected to the second heat pump exhaust heat exchanger (3b), a right interface on the other side of the second four-way reversing valve (2b) is connected to the second heat pump fresh air heat exchanger (5b), and the second heat pump exhaust heat exchanger (3b) is connected to the second heat pump fresh air heat exchanger (5b) via a second throttling element (4b); A certain amount of low boiling point working fluid is filled into the loop; The integrated unit can switch to the following working modes through the on / off combination of different air valves: Ventilation mode: D0 air valve is open, other air valves are closed; Multi-circuit heat recovery mode: D5 and D6 air valves are open, and other air valves are closed; Heat recovery and air treatment composite mode: D1 air valve, D4 ​​air valve, D5 air valve, D6 air valve are open, and other air valves are closed; Single-loop heat recovery mode: D2 and D3 air valves are open, and other air valves are closed; Air handling mode: D1 air valve and D4 air valve are open, and other air valves are closed; Air treatment and fresh air mode: D1 air valve, D4 ​​air valve, D air valve 0 are open, and other air valves are closed; The mutually isolated exhaust duct (7), the side duct (11) and the fresh air duct (15) are arranged side by side left and right, or arranged side by side up and down, or arranged in a mixed manner up and down and left and right.

2. The multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit according to claim 1, characterized in that: The compressor (1) and the four-way reversing valve (2) are placed in the exhaust duct (7) or the fresh air duct (15).

3. The multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit according to claim 1, characterized in that: The heat pump working fluid is R290, R32, R1234yf, R1234ze, R410A, R134a, R407C, R245fa or R411A, and each heat pump circuit is filled with the same working fluid, or different working fluids, or a mixture of several working fluids.

4. A multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit according to claim 1 or 3, characterized in that: The compressors are piston, screw, scroll, centrifugal, sliding vane or vortex type.

5. A multi-circuit heat pump type ventilation heat recovery and air treatment integrated unit according to claim 1 or 3, characterized in that: The compressor is replaced by a working fluid pump; the working fluid pump is a piston, screw, scroll, centrifugal, vane or vortex type.

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