Air source heat pump

Abstract

The present invention discloses an air source heat pump, which is composed of at least a compression mechanism, a first four-way valve, a second four-way valve, a first outdoor heat exchanger, a second outdoor heat exchanger, a heater, a first throttling mechanism, a second throttling mechanism, a third throttling mechanism, a first check valve, a second check valve, a flow control valve, a third check valve, and a fourth check valve; the low-pressure node of the first four-way valve is connected to the low-pressure node of the second four-way valve through a sixty-fifth pipeline, the high-pressure node of the first four-way valve is connected to the sixty-fifth pipeline between the low-pressure node of the first four-way valve and the low-pressure node of the second four-way valve through a sixty-fifth pipeline, the outlet end of the compression mechanism, the inlet end of the compression mechanism, the low-pressure node of the first four-way valve, and the low-pressure node of the second four-way valve in sequence, and the high-pressure node of the second four-way valve is connected to the sixtieth pipeline between the outlet end of the compression mechanism and the high-pressure node of the first four-way valve through a fifty-ninth pipeline; the characteristic is that: during continuous heating and defrosting, the refrigerant liquid can be prevented from being retained in the defrosted outdoor heat exchanger.

Description

Technical Field

[0001] The invention relates to an air source heat pump and belongs to the technical field of refrigeration. Background Art

[0002] The invention patent No. 201110355023.0, which was authorized by the applicant on June 29, 2016, proposes a refrigerant three-way flow conversion device, the system composition of which is as follows: Figure 5 As shown, this patent can be used to design a low ambient temperature air source heat pump that can achieve continuous heating and defrosting, such as Figure 6 As shown. Figure 6 In the system shown, the air source heat pump has at least two sets of outdoor heat exchangers, namely, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5. When the first outdoor heat exchanger 4 needs to be defrosted, the first four-way valve 70 is switched; while the second four-way valve 80 is not switched, the second outdoor heat exchanger 5 still works normally, absorbing heat from the outdoor air, part of which is supplied to the first outdoor heat exchanger 4 for defrosting, and the other part continues to supply heat through the heater 3.

[0003] Similarly, when the second outdoor heat exchanger 5 needs to be defrosted, the second four-way valve 80 is switched; while the first four-way valve 70 is not switched, the first outdoor heat exchanger 4 still works normally, absorbing heat from the outdoor air, part of which is supplied to the second outdoor heat exchanger 5 for defrosting, and the other part is continued to supply heat through the heater 3.

[0004] During operation, the heater 3 is always under condensing pressure and there is no risk of freezing; however, the problem in the defrosting process is that when an outdoor heat exchanger needs to be defrosted, for example Figure 6 As shown, when the first outdoor heat exchanger 4 needs to be defrosted, after the first four-way valve 70 is switched, the first outdoor heat exchanger 4 needs to rise from the evaporation pressure of normal operation to the condensation pressure in order to defrost. However, because the heater 3 is always under the condensation pressure during the operation, the pressure will hinder the condensed refrigerant liquid from flowing out of the first outdoor heat exchanger 4, so that the compressor exhaust gas cannot quickly enter the first outdoor heat exchanger 4 that needs to be defrosted, thereby prolonging the defrosting time of the first outdoor heat exchanger 4.

[0005] Similarly, when the second outdoor heat exchanger 5 needs to be defrosted, the same problem will exist. Summary of the invention

[0006] The purpose of the present invention is to provide an air source heat pump that can continuously supply heat and defrost, and to provide an air source heat pump that can avoid the retention of refrigerant liquid in the outdoor heat exchanger being defrosted during the defrosting process, shorten the defrosting time, and has a simple structure.

[0007] In order to overcome the problems existing in the above technology, the technical solution of the present invention to solve the technical problem is:

[0008] 1) An air source heat pump, comprising a compression mechanism (1), a first four-way valve (70), a second four-way valve (80), a first outdoor heat exchanger (4), a second outdoor heat exchanger (5), a heater (3), a first throttling mechanism (6), a second throttling mechanism (7), a third throttling mechanism (8), a first check valve (21), and a second check valve (22), wherein the air source heat pump further comprises a flow direction control valve (9), a third check valve (23), and a fourth check valve (24);

[0009] The low-pressure node (73) of the first four-way valve (70) is connected to the low-pressure node (83) of the second four-way valve (80) via a sixty-fifth pipeline (65); the high-pressure node (71) of the first four-way valve (70) is connected in sequence via a sixty-fifth pipeline (60), the outlet end of the compression mechanism (1), the inlet end of the compression mechanism (1) and the sixty-fifth pipeline (65) between the low-pressure node (73) of the first four-way valve (70) and the low-pressure node (83) of the second four-way valve (80); the high-pressure node (81) of the second four-way valve (80) is connected to a sixty-fifth pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the first four-way valve (70) via a fifty-ninth pipeline (59);

[0010] The first switching node (82) of the second four-way valve (80) is connected to the first switching node (72) of the first four-way valve (70) via the inlet end of the first one-way valve (21), the outlet end of the first one-way valve (21), the outlet end of the second one-way valve (22), and the inlet end of the second one-way valve (22) in sequence;

[0011] The second reversing node (84) of the second four-way valve (80) is connected to the second reversing node (74) of the first four-way valve (70) via a sixty-seventh pipeline (67), a second outdoor heat exchanger (5), a second throttling mechanism (7), a sixty-sixth pipeline (66), a first throttling mechanism (6), a first outdoor heat exchanger (4), and a sixty-fourth pipeline (64) in sequence;

[0012] The inlet end of the heater (3) is connected to the pipeline between the outlet end of the first one-way valve (21) and the outlet end of the second one-way valve (22) through a fifty-first pipeline (51), and the outlet end of the heater (3) is connected to the sixty-sixth pipeline (66) between the first throttling mechanism (6) and the second throttling mechanism (7) through a fifty-fifth pipeline (55);

[0013] One end of the flow control valve (9) is connected to the pipeline at the outlet end of the heater (3), and the other end of the flow control valve (9) is connected to the middle air supply port (A) of the compression mechanism (1) through the third throttling mechanism (8) and the fifty-second pipeline (52) in sequence;

[0014] The inlet end of the third one-way valve (23) is connected to the pipeline between the second outdoor heat exchanger (5) and the second throttling mechanism (7), and the outlet end of the third one-way valve (23) is connected to the pipeline between the first outdoor heat exchanger (4) and the first throttling mechanism (6) via the outlet end of the fourth one-way valve (24) and the inlet end of the fourth one-way valve (24) in sequence;

[0015] One end of the fifty-fourth pipeline (54) is connected to the pipeline between the flow control valve (9) and the third throttling mechanism (8), and the other end of the fifty-fourth pipeline (54) is connected to the pipeline between the outlet end of the third one-way valve (23) and the outlet end of the fourth one-way valve (24).

[0016] 2) An air source heat pump, comprising a compression mechanism (1), a first four-way valve (70), a second four-way valve (80), a first outdoor heat exchanger (4), a second outdoor heat exchanger (5), a heater (3), a first throttling mechanism (6), a third throttling mechanism (8), a first check valve (21), and a second check valve (22), wherein the air source heat pump further comprises a flow control valve (9), a third check valve (23), a fourth check valve (24), a fifth check valve (25), and a sixth check valve (26);

[0017] The low-pressure node (73) of the first four-way valve (70) is connected to the low-pressure node (83) of the second four-way valve (80) via a sixty-fifth pipeline (65); the high-pressure node (71) of the first four-way valve (70) is connected in sequence via a sixty-fifth pipeline (60), the outlet end of the compression mechanism (1), the inlet end of the compression mechanism (1) and the sixty-fifth pipeline (65) between the low-pressure node (73) of the first four-way valve (70) and the low-pressure node (83) of the second four-way valve (80); the high-pressure node (81) of the second four-way valve (80) is connected to a sixty-fifth pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the first four-way valve (70) via a fifty-ninth pipeline (59);

[0018] The first switching node (82) of the second four-way valve (80) is connected to the first switching node (72) of the first four-way valve (70) via the inlet end of the first one-way valve (21), the outlet end of the first one-way valve (21), the outlet end of the second one-way valve (22), and the inlet end of the second one-way valve (22) in sequence;

[0019] The second reversing node (84) of the second four-way valve (80) is connected to the second reversing node (74) of the first four-way valve (70) via the sixty-seventh pipeline (67), the second outdoor heat exchanger (5), the outlet end of the sixth one-way valve (26), the inlet end of the sixth one-way valve (26), the sixty-sixth pipeline (66), the inlet end of the fifth one-way valve (25), the outlet end of the fifth one-way valve (25), the first outdoor heat exchanger (4), and the sixty-fourth pipeline (64) in sequence;

[0020] The inlet end of the heater (3) is connected to the pipeline between the outlet end of the first one-way valve (21) and the outlet end of the second one-way valve (22) through a fifty-first pipeline (51), and the outlet end of the heater (3) is connected to the inlet end of the fifth one-way valve (25) and the inlet end of the sixth one-way valve (26) through the first throttling mechanism (6) and the fifty-fifth pipeline (55) in sequence.

[0021] One end of the flow control valve (9) is connected to a pipeline between the outlet end of the heater (3) and the first throttling mechanism (6), and the other end of the flow control valve (9) is connected to the middle air supply port (A) of the compression mechanism (1) via the third throttling mechanism (8) and the fifty-second pipeline (52) in sequence;

[0022] The inlet end of the third one-way valve (23) is connected to the pipeline between the second outdoor heat exchanger (5) and the outlet end of the sixth one-way valve (26), and the outlet end of the third one-way valve (23) is connected to the pipeline between the first outdoor heat exchanger (4) and the outlet end of the fifth one-way valve (25) in sequence through the outlet end of the fourth one-way valve (24) and the inlet end of the fourth one-way valve (24);

[0023] One end of the fifty-fourth pipeline (54) is connected to the pipeline between the flow control valve (9) and the third throttling mechanism (8), and the other end of the fifty-fourth pipeline (54) is connected to the pipeline between the outlet end of the third one-way valve (23) and the outlet end of the fourth one-way valve (24).

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. During defrosting operation, it can prevent the refrigerant liquid from being retained in the outdoor heat exchanger being defrosted;

[0026] 2. The defrosting time of each group of outdoor heat exchangers can be shortened;

[0027] 3. Simple structure;

[0028] 4. The present invention is applicable to industrial and civil air source heat pumps, and is particularly applicable to low temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of embodiment 1 of the present invention;

[0030] Figure 2 It is a structural schematic diagram of embodiment 2 of the present invention;

[0031] Figure 3 is a schematic structural diagram of Embodiment 3 of the present invention;

[0032] Figure 4 is a schematic structural diagram of Embodiment 4 of the present invention;

[0033] Figure 5 It is a schematic diagram of the prior art structure;

[0034] Figure 6 It is a schematic diagram of the prior art structure. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment is an air source heat pump that can realize continuous heating and defrosting, and is used in occasions with heating needs. The entire device includes the following components: compression mechanism 1 (including low-pressure stage 1-1 and high-pressure stage 1-2), first four-way valve 70, second four-way valve 80, first throttling mechanism 6, second throttling mechanism 7, third throttling mechanism 8, first outdoor heat exchanger 4, second outdoor heat exchanger 5, heater 3, flow control valve 9. The first throttling mechanism 6, the second throttling mechanism 7, and the third throttling mechanism 8 are all electronic expansion valves. The flow control valve 9 is a solenoid valve, especially a normally open solenoid valve. Its valve body is usually made of copper or stainless steel.

[0038] During winter operation, the air source heat pump can realize two functions: heating and continuous heating and defrosting.

[0039] During normal operation, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 are both heat source side heat exchangers, acting as evaporators to absorb heat from the environment; the heater 3 is a user side heat exchanger, acting as a condenser to provide heating for the user.

[0040] The workflow of each function is described below.

[0041] (1) Heating function

[0042] The compression mechanism 1, the first outdoor heat exchanger 4, the second outdoor heat exchanger 5, and the heater 3 all work normally; the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 act as evaporators to absorb heat from the environment; the heater 3 acts as a condenser to provide heating for the user.

[0043] The first throttling mechanism 6 and the second throttling mechanism 7 work normally; they are used to throttle and control the refrigerant flow through the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 respectively.

[0044] The third throttling mechanism 8 works normally; it is used to throttle the high-pressure refrigerant liquid into a medium-pressure gas-liquid two-phase mixture, and spray it into the compressor through the middle air supply port A of the compression mechanism 1. In this process, the third throttling mechanism 8 is also used to control the flow rate of the sprayed refrigerant.

[0045] Flow control valve 9 is fully open.

[0046] When working, the high-pressure node 71 of the first four-way valve 70 is communicated with the first reversing node 72 of the first four-way valve 70, and the second reversing node 74 of the first four-way valve 70 is communicated with the low-pressure node 73 of the first four-way valve 70. The high-pressure node 81 of the second four-way valve 80 is communicated with the first reversing node 82 of the second four-way valve 80, and the second reversing node 84 of the second four-way valve 80 is communicated with the low-pressure node 83 of the second four-way valve 80.

[0047] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, and the outlet end of the second check valve 22 to enter the 51st pipeline 51;

[0048] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, and the outlet end of the first check valve 21 and enters the 51st pipeline 51.

[0049] After being mixed in the fifty-first pipeline 51, the refrigerant enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, where the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out from the outlet end of the heater 3, it enters the fifty-fifth pipeline 55 and is divided into two paths; the first path passes through the flow control valve 9, the third throttling mechanism 8, and the fifty-second pipeline 52 in sequence, and enters the middle air supply port A of the compression mechanism 1; the second path enters the sixty-sixth pipeline 66 and is divided into two paths again; one path passes through the first throttling mechanism 6, the first outdoor heat exchanger 4, the sixty-fourth pipeline 64, the second reversing node 74 of the first four-way valve 70, and the low-pressure node 73 of the first four-way valve 70 in sequence, and enters the sixty-fifth pipeline 65; the other path passes through the second throttling mechanism 7, the second outdoor heat exchanger 5, the sixty-seventh pipeline 67, the second reversing node 84 of the second four-way valve 80, and the low-pressure node 83 of the second four-way valve 80 in sequence, and also enters the sixty-fifth pipeline 65; after the two paths are mixed in the sixty-fifth pipeline 65, they return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 to be compressed again, and complete a cycle.

[0050] (2) Continuous heating and defrosting function

[0051] When working under this function, the flow control valve 9 is closed. The heater 3 works normally to provide heating for the user. The two groups of outdoor heat exchangers are defrosted alternately. The working process is as follows.

[0052] 1) When the first outdoor heat exchanger 4 is defrosted, the second outdoor heat exchanger 5 works normally and absorbs heat from the outdoor air.

[0053] At this time, the first throttling mechanism 6 is closed, the second throttling mechanism 7 and the third throttling mechanism 8 work normally; the second four-way valve 80 does not move, and still maintains the state of the heating function;

[0054] The first four-way valve 70 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 71 of the first four-way valve 70 is connected to the second switching node 74 of the first four-way valve 70, and the first switching node 72 of the first four-way valve 70 is connected to the low-pressure node 73 of the first four-way valve 70.

[0055] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the second reversing node 74 of the first four-way valve 70, the 64th pipeline 64, the first outdoor heat exchanger 4, the inlet end of the fourth check valve 24, the outlet end of the fourth check valve 24, the 54th pipeline 54, the third throttling mechanism 8, the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1;

[0056] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, the outlet end of the first check valve 21, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out from the outlet end of the heater 3, it passes through the 55th pipeline 55, the 66th pipeline 66, the second throttling mechanism 7, the second outdoor heat exchanger 5, the 67th pipeline 67, the second reversing node 84 of the second four-way valve 80, the low-pressure node 83 of the second four-way valve 80 in sequence, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0057] 2) When the second outdoor heat exchanger 5 is defrosted, the first outdoor heat exchanger 4 works normally and absorbs heat from the outdoor air.

[0058] At this time, the second throttling mechanism 7 is closed, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the first four-way valve 70 does not move, and still maintains the state of the heating function;

[0059] The second four-way valve 80 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 81 of the second four-way valve 80 is connected to the second switching node 84 of the second four-way valve 80, and the first switching node 82 of the second four-way valve 80 is connected to the low-pressure node 83 of the second four-way valve 80.

[0060] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, the outlet end of the second check valve 22, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out from the outlet end of the heater 3, it passes through the 55th pipeline 55, the 66th pipeline 66, the first throttling mechanism 6, the first outdoor heat exchanger 4, the 64th pipeline 64, the second reversing node 74 of the first four-way valve 70, the low-pressure node 73 of the first four-way valve 70 in sequence, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0061] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the second reversing node 84 of the second four-way valve 80, the 67th pipeline 67, the second outdoor heat exchanger 5, the inlet end of the third one-way valve 23, the outlet end of the third one-way valve 23, the 54th pipeline 54, the third throttling mechanism 8, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1 to complete a cycle.

[0062] Example 2

[0063] like Figure 2 As shown, this embodiment is also an air source heat pump that can achieve continuous heating and defrosting, and is used in occasions with heating needs. Figure 2 The scheme shown is Figure 1 The difference between the scheme shown is: Figure 1 Compared with the scheme shown, Figure 2 The solution shown adds an economizer 10 to the system. Figure 2As shown; the installation method of the economizer 10 in the system is: the high-pressure side inlet end of the economizer 10 is connected to the outlet end of the heater 3, and the high-pressure side outlet end of the economizer 10 is connected to the sixty-sixth pipeline 66 between the second throttling mechanism 7 and the first throttling mechanism 6 through the fifty-fifth pipeline 55; one end of the flow control valve 9 is connected to the pipeline at the high-pressure side outlet end of the economizer 10, and the other end of the flow control valve 9 is connected to the low-pressure side inlet end of the economizer 10 through the third throttling mechanism 8, and the low-pressure side outlet end of the economizer 10 is connected to the middle air supply port A of the compression mechanism 1 through the fifty-second pipeline 52; one end of the fifty-fourth pipeline 54 is connected to the pipeline between the flow control valve 9 and the third throttling mechanism 8, and the other end of the fifty-fourth pipeline 54 is connected to the pipeline between the outlet end of the third check valve 23 and the outlet end of the fourth check valve 24.

[0064] In actual use, the economizer 10 can also be installed in the system in the following manner: the high-pressure side inlet end of the economizer 10 is connected to the outlet end of the heater 3, and the high-pressure side outlet end of the economizer 10 is connected to the sixty-sixth pipeline 66 between the second throttling mechanism 7 and the first throttling mechanism 6 through the fifty-fifth pipeline 55; one end of the flow control valve 9 is connected to the pipeline at the high-pressure side inlet end of the economizer 10, and the other end of the flow control valve 9 is connected to the low-pressure side inlet end of the economizer 10 through the third throttling mechanism 8, and the low-pressure side outlet end of the economizer 10 is connected to the middle air supply port A of the compression mechanism 1 through the fifty-second pipeline 52; one end of the fifty-fourth pipeline 54 is connected to the pipeline between the flow control valve 9 and the third throttling mechanism 8, and the other end of the fifty-fourth pipeline 54 is connected to the pipeline between the outlet end of the third check valve 23 and the outlet end of the fourth check valve 24.

[0065] During operation, the function of the economizer 10 is to use the intermediate pressure refrigerant to supercool the high-pressure liquid refrigerant entering the second throttling mechanism 7 and the first throttling mechanism 6, and to achieve air replenishment and enthalpy increase.

[0066] During winter operation, the air source heat pump can also realize two functions: heating and continuous heating and defrosting.

[0067] During normal operation, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 are both heat source side heat exchangers, acting as evaporators to absorb heat from the environment; the heater 3 is a user side heat exchanger, acting as a condenser to provide heating for the user.

[0068] The workflow of each function is described below.

[0069] (1) Heating function

[0070] The compression mechanism 1, the first outdoor heat exchanger 4, the second outdoor heat exchanger 5, and the heater 3 all work normally; the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 act as evaporators to absorb heat from the environment; the heater 3 acts as a condenser to provide heating for the user.

[0071] The first throttling mechanism 6 and the second throttling mechanism 7 work normally; they are used to throttle and control the refrigerant flow through the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 respectively.

[0072] The third throttling mechanism 8 works normally; it is used to throttle a part of the high-pressure refrigerant liquid into a medium-pressure gas-liquid two-phase mixture, and to supercool another part of the high-pressure refrigerant liquid that is about to enter the first throttling mechanism 6 and the second throttling mechanism 7 through the economizer 10. After absorbing heat and evaporating into the intermediate-pressure refrigerant gas in the economizer 10, it is sprayed into the compressor through the intermediate air supply port A of the compression mechanism 1. In this process, the third throttling mechanism 8 is also used to control the flow rate of the sprayed refrigerant.

[0073] Flow control valve 9 is fully open.

[0074] When working, the high-pressure node 71 of the first four-way valve 70 is communicated with the first reversing node 72 of the first four-way valve 70, and the second reversing node 74 of the first four-way valve 70 is communicated with the low-pressure node 73 of the first four-way valve 70. The high-pressure node 81 of the second four-way valve 80 is communicated with the first reversing node 82 of the second four-way valve 80, and the second reversing node 84 of the second four-way valve 80 is communicated with the low-pressure node 83 of the second four-way valve 80.

[0075] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, and the outlet end of the second check valve 22 to enter the 51st pipeline 51;

[0076] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, and the outlet end of the first check valve 21 and enters the 51st pipeline 51.

[0077] After being mixed in the fifty-first pipeline 51, it passes through the inlet end of the heater 3 and enters the heater 3 to provide heating for the user, where the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out from the outlet end of the heater 3, it enters the economizer 10 through the high-pressure side inlet end of the economizer 10 to be supercooled. The supercooled high-pressure refrigerant liquid comes out from the high-pressure side outlet end of the economizer 10 and is divided into two paths; the first path enters the third throttling mechanism 8 through the flow control valve 9 to be throttled into a medium-pressure gas-liquid two-phase mixture, and then enters the economizer 10 through the low-pressure side inlet end of the economizer 10 to supercool the high-pressure refrigerant liquid, absorbs heat and evaporates into an intermediate-pressure refrigerant gas, and then passes through the low-pressure side outlet end of the economizer 10, the fifty-second pipeline 52, and the intermediate air supply port A of the compression mechanism 1 in sequence and is sprayed into the compressor;

[0078] The second route enters the sixty-sixth pipeline 66 through the fifty-fifth pipeline 55 and is divided into two routes; one route passes through the first throttling mechanism 6, the first outdoor heat exchanger 4, the sixty-fourth pipeline 64, the second reversing node 74 of the first four-way valve 70, and the low-pressure node 73 of the first four-way valve 70 in sequence, and enters the sixty-fifth pipeline 65; the other route passes through the second throttling mechanism 7, the second outdoor heat exchanger 5, the sixty-seventh pipeline 67, the second reversing node 84 of the second four-way valve 80, and the low-pressure node 83 of the second four-way valve 80 in sequence, and also enters the sixty-fifth pipeline 65; after the two routes are mixed in the sixty-fifth pipeline 65, they return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 and are compressed again, completing a cycle.

[0079] (2) Continuous heating and defrosting function

[0080] When working under this function, the flow control valve 9 is closed. The heater 3 works normally to provide heating for the user. The two groups of outdoor heat exchangers are defrosted alternately. The working process is as follows.

[0081] 1) When the first outdoor heat exchanger 4 is defrosted, the second outdoor heat exchanger 5 works normally and absorbs heat from the outdoor air.

[0082] At this time, the first throttling mechanism 6 is closed, the second throttling mechanism 7 and the third throttling mechanism 8 work normally; the second four-way valve 80 does not move, and still maintains the state of the heating function;

[0083] The first four-way valve 70 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 71 of the first four-way valve 70 is connected to the second switching node 74 of the first four-way valve 70, and the first switching node 72 of the first four-way valve 70 is connected to the low-pressure node 73 of the first four-way valve 70.

[0084] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the second reversing node 74 of the first four-way valve 70, the 64th pipeline 64, the first outdoor heat exchanger 4, the inlet end of the fourth check valve 24, the outlet end of the fourth check valve 24, the 54th pipeline 54, the third throttling mechanism 8, the low-pressure side inlet end of the economizer 10, the low-pressure side outlet end of the economizer 10, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1;

[0085] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first non-return valve 21, the outlet end of the first non-return valve 21, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid, and the refrigerant liquid then passes through the outlet end of the heater 3, the high-pressure side inlet end of the economizer 10, the high-pressure side outlet end of the economizer 10, the 55th pipeline 55, the 66th pipeline 66, the second throttling mechanism 7, the second outdoor heat exchanger 5, the 67th pipeline 67, the second reversing node 84 of the second four-way valve 80, the low-pressure node 83 of the second four-way valve 80, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0086] 2) When the second outdoor heat exchanger 5 is defrosted, the first outdoor heat exchanger 4 works normally and absorbs heat from the outdoor air.

[0087] At this time, the second throttling mechanism 7 is closed, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the first four-way valve 70 does not move, and still maintains the state of the heating function;

[0088] The second four-way valve 80 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 81 of the second four-way valve 80 is connected to the second switching node 84 of the second four-way valve 80, and the first switching node 82 of the second four-way valve 80 is connected to the low-pressure node 83 of the second four-way valve 80.

[0089] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second one-way valve 22, the outlet end of the second one-way valve 22, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid, and then passes through the outlet end of the heater 3, the high-pressure side inlet end of the economizer 10, the high-pressure side outlet end of the economizer 10, the 55th pipeline 55, the 66th pipeline 66, the first throttling mechanism 6, the first outdoor heat exchanger 4, the 64th pipeline 64, the second reversing node 74 of the first four-way valve 70, the low-pressure node 73 of the first four-way valve 70, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0090] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the second reversing node 84 of the second four-way valve 80, the 67th pipeline 67, the second outdoor heat exchanger 5, the inlet end of the third one-way valve 23, the outlet end of the third one-way valve 23, the 54th pipeline 54, the third throttling mechanism 8, the low-pressure side inlet end of the economizer 10, the low-pressure side outlet end of the economizer 10, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1 to complete a cycle.

[0091] Example 3

[0092] like Figure 3 As shown, this embodiment is also an air source heat pump that can achieve continuous heating and defrosting, and is used in occasions with heating needs. Figure 3 The scheme shown is Figure 1 The difference between the scheme shown is: Figure 1 Compared with the scheme shown in Figure 3 In the illustrated solution, the first throttling mechanism 6, the fifth one-way valve 25, and the sixth one-way valve 26 replace Figure 1 The first throttling mechanism 6 and the second throttling mechanism 7 in the illustrated scheme make Figure 3 The scheme shown has one less throttling mechanism and is less costly.

[0093] The whole device includes the following components: compression mechanism 1 (including low pressure stage 1-1 and high pressure stage 1-2), first four-way valve 70, second four-way valve 80, first throttling mechanism 6, third throttling mechanism 8, first outdoor heat exchanger 4, second outdoor heat exchanger 5, heater 3, flow control valve 9. The first throttling mechanism 6 and the third throttling mechanism 8 are both electronic expansion valves. The flow control valve 9 is a solenoid valve, especially a normally open solenoid valve. Its valve body is usually made of copper or stainless steel.

[0094] During winter operation, the air source heat pump can realize two functions: heating and continuous heating and defrosting.

[0095] During normal operation, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 are both heat source side heat exchangers, acting as evaporators to absorb heat from the environment; the heater 3 is a user side heat exchanger, acting as a condenser to provide heating for the user.

[0096] The workflow of each function is described below.

[0097] (1) Heating function

[0098] The compression mechanism 1, the first outdoor heat exchanger 4, the second outdoor heat exchanger 5, and the heater 3 all work normally; the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 act as evaporators to absorb heat from the environment; the heater 3 acts as a condenser to provide heating for the user.

[0099] The first throttling mechanism 6 operates normally; it is used to throttle and control the refrigerant flow through the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5.

[0100] The third throttling mechanism 8 works normally; it is used to throttle the high-pressure refrigerant liquid into a medium-pressure gas-liquid two-phase mixture, and spray it into the compressor through the middle air supply port A of the compression mechanism 1. In this process, the third throttling mechanism 8 is also used to control the flow rate of the sprayed refrigerant.

[0101] Flow control valve 9 is fully open.

[0102] When working, the high-pressure node 71 of the first four-way valve 70 is communicated with the first reversing node 72 of the first four-way valve 70, and the second reversing node 74 of the first four-way valve 70 is communicated with the low-pressure node 73 of the first four-way valve 70. The high-pressure node 81 of the second four-way valve 80 is communicated with the first reversing node 82 of the second four-way valve 80, and the second reversing node 84 of the second four-way valve 80 is communicated with the low-pressure node 83 of the second four-way valve 80.

[0103] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, and the outlet end of the second check valve 22 to enter the 51st pipeline 51;

[0104] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, and the outlet end of the first check valve 21 and enters the 51st pipeline 51.

[0105] After the two paths are mixed in the fifty-first pipeline 51, they enter the heater 3 through the inlet end of the heater 3 to provide heating for the user, where the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out of the outlet end of the heater 3, it is divided into two paths; the first path passes through the flow control valve 9, the third throttling mechanism 8, and the fifty-second pipeline 52 in sequence, and enters the middle air supply port A of the compression mechanism 1; the second path enters the first throttling mechanism 6 and is throttled, and then enters the sixty-sixth pipeline 66 through the fifty-fifth pipeline 55 and is divided into two paths again; one path passes through the inlet end of the fifth check valve 25, the outlet end of the fifth check valve 25 in sequence , the first outdoor heat exchanger 4, the sixty-fourth pipeline 64, the second reversing node 74 of the first four-way valve 70, the low-pressure node 73 of the first four-way valve 70, and enter the sixty-fifth pipeline 65; the other path passes through the inlet end of the sixth one-way valve 26, the outlet end of the sixth one-way valve 26, the second outdoor heat exchanger 5, the sixty-seventh pipeline 67, the second four-way valve 80 second reversing node 84, the second four-way valve 80 low-pressure node 83, and also enters the sixty-fifth pipeline 65; after the two paths are mixed in the sixty-fifth pipeline 65, they return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 to be compressed again, and complete a cycle.

[0106] (2) Continuous heating and defrosting function

[0107] When working under this function, the flow control valve 9 is closed. The heater 3 works normally to provide heating for the user. The two groups of outdoor heat exchangers are defrosted alternately. The working process is as follows.

[0108] 1) When the first outdoor heat exchanger 4 is defrosted, the second outdoor heat exchanger 5 works normally and absorbs heat from the outdoor air.

[0109] At this time, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the second four-way valve 80 does not move, and still maintains the state of the heating function;

[0110] The first four-way valve 70 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 71 of the first four-way valve 70 is connected to the second switching node 74 of the first four-way valve 70, and the first switching node 72 of the first four-way valve 70 is connected to the low-pressure node 73 of the first four-way valve 70.

[0111] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the second reversing node 74 of the first four-way valve 70, the 64th pipeline 64, the first outdoor heat exchanger 4, the inlet end of the fourth check valve 24, the outlet end of the fourth check valve 24, the 54th pipeline 54, the third throttling mechanism 8, the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1;

[0112] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, the outlet end of the first check valve 21, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out of the outlet end of the heater 3, it passes through the first throttling mechanism 6, the 55th pipeline 55, the 66th pipeline 66, the inlet end of the sixth check valve 26, the outlet end of the sixth check valve 26, the second outdoor heat exchanger 5, the 67th pipeline 67, the second reversing node 84 of the second four-way valve 80, the low-pressure node 83 of the second four-way valve 80, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0113] 2) When the second outdoor heat exchanger 5 is defrosted, the first outdoor heat exchanger 4 works normally and absorbs heat from the outdoor air.

[0114] At this time, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the first four-way valve 70 does not move, and still maintains the state of the heating function;

[0115] The second four-way valve 80 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 81 of the second four-way valve 80 is connected to the second switching node 84 of the second four-way valve 80, and the first switching node 82 of the second four-way valve 80 is connected to the low-pressure node 83 of the second four-way valve 80.

[0116] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, the outlet end of the second check valve 22, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out from the outlet end of the heater 3, it passes through the first throttling mechanism 6, the 55th pipeline 55, the 66th pipeline 66, the inlet end of the fifth check valve 25, the outlet end of the fifth check valve 25, the first outdoor heat exchanger 4, the 64th pipeline 64, the second reversing node 74 of the first four-way valve 70, and the low-pressure node 73 of the first four-way valve 70, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0117] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the second reversing node 84 of the second four-way valve 80, the 67th pipeline 67, the second outdoor heat exchanger 5, the inlet end of the third one-way valve 23, the outlet end of the third one-way valve 23, the 54th pipeline 54, the third throttling mechanism 8, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1 to complete a cycle.

[0118] Example 4

[0119] like Figure 4 As shown, this embodiment is also an air source heat pump that can achieve continuous heating and defrosting, and is used in occasions with heating needs. Figure 4 The scheme shown is Figure 3 The difference between the scheme shown is: Figure 3 Compared with the scheme shown, Figure 4 The solution shown adds an economizer 10 to the system. Figure 4 As shown; the installation method of the economizer 10 in the system is: the high-pressure side inlet end of the economizer 10 is connected to the outlet end of the heater 3, and the high-pressure side outlet end of the economizer 10 is connected to the sixty-sixth pipeline 66 between the inlet end of the fifth check valve 25 and the inlet end of the sixth check valve 26 through the first throttling mechanism 6 and the fifty-fifth pipeline 55 in sequence; one end of the flow control valve 9 is connected to the pipeline at the high-pressure side outlet end of the economizer 10, and the other end of the flow control valve 9 is connected to the low-pressure side inlet end of the economizer 10 through the third throttling mechanism 8, and the low-pressure side outlet end of the economizer 10 is connected to the middle air supply port A of the compression mechanism 1 through the fifty-second pipeline 52; one end of the fifty-fourth pipeline 54 is connected to the pipeline between the flow control valve 9 and the third throttling mechanism 8, and the other end of the fifty-fourth pipeline 54 is connected to the pipeline between the outlet end of the third check valve 23 and the outlet end of the fourth check valve 24.

[0120] In actual use, the economizer 10 can also be installed in the system in the following manner: the high-pressure side inlet end of the economizer 10 is connected to the outlet end of the heater 3, and the high-pressure side outlet end of the economizer 10 is connected to the sixty-sixth pipeline 66 between the inlet end of the fifth check valve 25 and the inlet end of the sixth check valve 26 through the first throttling mechanism 6 and the fifty-fifth pipeline 55 in sequence; one end of the flow control valve 9 is connected to the pipeline at the high-pressure side inlet end of the economizer 10, and the other end of the flow control valve 9 is connected to the low-pressure side inlet end of the economizer 10 through the third throttling mechanism 8, and the low-pressure side outlet end of the economizer 10 is connected to the middle air supply port A of the compression mechanism 1 through the fifty-second pipeline 52; one end of the fifty-fourth pipeline 54 is connected to the pipeline between the flow control valve 9 and the third throttling mechanism 8, and the other end of the fifty-fourth pipeline 54 is connected to the pipeline between the outlet end of the third check valve 23 and the outlet end of the fourth check valve 24.

[0121] During operation, the function of the economizer 10 is to use the intermediate pressure refrigerant to subcool the high pressure liquid refrigerant entering the first throttling mechanism 6 and realize the air replenishment and enthalpy increase.

[0122] During winter operation, the air source heat pump can also realize two functions: heating and continuous heating and defrosting.

[0123] During normal operation, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 are both heat source side heat exchangers, acting as evaporators to absorb heat from the environment; the heater 3 is a user side heat exchanger, acting as a condenser to provide heating for the user.

[0124] The workflow of each function is described below.

[0125] (1) Heating function

[0126] The compression mechanism 1, the first outdoor heat exchanger 4, the second outdoor heat exchanger 5, and the heater 3 all work normally; the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5 act as evaporators to absorb heat from the environment; the heater 3 acts as a condenser to provide heating for the user. The first throttling mechanism 6 works normally; it is used to throttle and control the refrigerant flow through the first outdoor heat exchanger 4 and the second outdoor heat exchanger 5.

[0127] The third throttling mechanism 8 works normally; it is used to throttle a part of the high-pressure refrigerant liquid into a medium-pressure gas-liquid two-phase mixture, and to supercool another part of the high-pressure refrigerant liquid that is about to enter the first throttling mechanism 6 through the economizer 10. After absorbing heat and evaporating into the intermediate-pressure refrigerant gas in the economizer 10, it is sprayed into the compressor through the intermediate air supply port A of the compression mechanism 1. In this process, the third throttling mechanism 8 is also used to control the flow rate of the sprayed refrigerant. The flow control valve 9 is fully open.

[0128] When working, the high-pressure node 71 of the first four-way valve 70 is communicated with the first reversing node 72 of the first four-way valve 70, and the second reversing node 74 of the first four-way valve 70 is communicated with the low-pressure node 73 of the first four-way valve 70. The high-pressure node 81 of the second four-way valve 80 is communicated with the first reversing node 82 of the second four-way valve 80, and the second reversing node 84 of the second four-way valve 80 is communicated with the low-pressure node 83 of the second four-way valve 80.

[0129] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second check valve 22, and the outlet end of the second check valve 22 to enter the 51st pipeline 51;

[0130] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first check valve 21, and the outlet end of the first check valve 21 and enters the 51st pipeline 51.

[0131] After the two paths are mixed in the fifty-first pipeline 51, they pass through the inlet end of the heater 3 and enter the heater 3 to provide heating for the user, where the refrigerant gas releases heat and becomes liquid. After the refrigerant liquid comes out of the outlet end of the heater 3, it enters the economizer 10 through the high-pressure side inlet end of the economizer 10 to be supercooled. The supercooled high-pressure refrigerant liquid comes out of the high-pressure side outlet end of the economizer 10 and is divided into two paths; the first path enters the third throttling mechanism 8 through the flow control valve 9 to be throttled into a medium-pressure gas-liquid two-phase mixture, and then enters the economizer 10 through the low-pressure side inlet end of the economizer 10 to supercool the high-pressure refrigerant liquid, absorbs heat and evaporates into an intermediate-pressure refrigerant gas, and then passes through the low-pressure side outlet end of the economizer 10, the fifty-second pipeline 52, and the intermediate air supply port A of the compression mechanism 1 in sequence and is sprayed into the compressor;

[0132] The second path passes through the first throttling mechanism 6 and the fifty-fifth pipeline 55 in sequence and enters the sixty-sixth pipeline 66 and is divided into two paths; one path passes through the inlet end of the fifth one-way valve 25, the outlet end of the fifth one-way valve 25, the first outdoor heat exchanger 4, the sixty-fourth pipeline 64, the second reversing node 74 of the first four-way valve 70, and the low-pressure node 73 of the first four-way valve 70 in sequence, and enters the sixty-fifth pipeline 65; the other path passes through the inlet end of the sixth one-way valve 26, the outlet end of the sixth one-way valve 26, the second outdoor heat exchanger 5, the sixty-seventh pipeline 67, the second reversing node 84 of the second four-way valve 80, and the low-pressure node 83 of the second four-way valve 80 in sequence, and also enters the sixty-fifth pipeline 65; after the two paths are mixed in the sixty-fifth pipeline 65, they return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 to be compressed again, and complete a cycle.

[0133] (2) Continuous heating and defrosting function

[0134] When working under this function, the flow control valve 9 is closed. The heater 3 works normally to provide heating for the user. The two groups of outdoor heat exchangers are defrosted alternately. The working process is as follows.

[0135] 1) When the first outdoor heat exchanger 4 is defrosted, the second outdoor heat exchanger 5 works normally and absorbs heat from the outdoor air.

[0136] At this time, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the second four-way valve 80 does not move, and still maintains the state of the heating function;

[0137] The first four-way valve 70 is switched, and the connection relationship between its four nodes is as follows: the high-pressure node 71 of the first four-way valve 70 is connected to the second switching node 74 of the first four-way valve 70, and the first switching node 72 of the first four-way valve 70 is connected to the low-pressure node 73 of the first four-way valve 70.

[0138] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the second reversing node 74 of the first four-way valve 70, the 64th pipeline 64, the first outdoor heat exchanger 4, the inlet end of the fourth check valve 24, the outlet end of the fourth check valve 24, the 54th pipeline 54, the third throttling mechanism 8, the low-pressure side inlet end of the economizer 10, the low-pressure side outlet end of the economizer 10, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1;

[0139] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the first reversing node 82 of the second four-way valve 80, the inlet end of the first non-return valve 21, the outlet end of the first non-return valve 21, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid, and the refrigerant liquid then passes through the outlet end of the heater 3, the high-pressure side inlet end of the economizer 10, the high-pressure side outlet end of the economizer 10, the first throttling mechanism 6, the 55th pipeline 55, the 66th pipeline 66, the inlet end of the sixth non-return valve 26, the outlet end of the sixth non-return valve 26, the second outdoor heat exchanger 5, the 67th pipeline 67, the second reversing node 84 of the second four-way valve 80, the low-pressure node 83 of the second four-way valve 80, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0140] 2) When the second outdoor heat exchanger 5 is defrosted, the first outdoor heat exchanger 4 works normally and absorbs heat from the outdoor air.

[0141] At this time, the first throttling mechanism 6 and the third throttling mechanism 8 work normally; the first four-way valve 70 does not move and still maintains the state of the heating function; the second four-way valve 80 switches, and the connection relationship between its four nodes is as follows: the high-pressure node 81 of the second four-way valve 80 is connected to the second switching node 84 of the second four-way valve 80, and the first switching node 82 of the second four-way valve 80 is connected to the low-pressure node 83 of the second four-way valve 80.

[0142] The working process is as follows: after the refrigerant is discharged from the outlet end of the compression mechanism 1, it enters the 60th pipeline 60 and is divided into two paths; the first path passes through the 60th pipeline 60, the high-pressure node 71 of the first four-way valve 70, the first reversing node 72 of the first four-way valve 70, the inlet end of the second one-way valve 22, the outlet end of the second one-way valve 22, and the 51st pipeline 51 in sequence, and enters the heater 3 through the inlet end of the heater 3 to provide heating for the user, wherein the refrigerant gas releases heat and becomes liquid, and then passes through the outlet end of the heater 3, the high-pressure side inlet end of the economizer 10, the high-pressure side outlet end of the economizer 10, the first throttling mechanism 6, the 55th pipeline 55, the 66th pipeline 66, the inlet end of the fifth one-way valve 25, the outlet end of the fifth one-way valve 25, the first outdoor heat exchanger 4, the 64th pipeline 64, the second reversing node 74 of the first four-way valve 70, the low-pressure node 73 of the first four-way valve 70, and enters the 65th pipeline 65; then returns to the inlet end of the compression mechanism 1, enters the compression mechanism 1 to be compressed again, and completes a cycle.

[0143] The second route passes through the 60th pipeline 60, the 59th pipeline 59, the high-pressure node 81 of the second four-way valve 80, the second reversing node 84 of the second four-way valve 80, the 67th pipeline 67, the second outdoor heat exchanger 5, the inlet end of the third one-way valve 23, the outlet end of the third one-way valve 23, the 54th pipeline 54, the third throttling mechanism 8, the low-pressure side inlet end of the economizer 10, the low-pressure side outlet end of the economizer 10, and the 52nd pipeline 52, and enters the middle air supply port A of the compression mechanism 1 to complete a cycle.

[0144] In all the above embodiments of the present invention, any one of the first one-way valve 21, the second one-way valve 22, the third one-way valve 23, the fourth one-way valve 24, the fifth one-way valve 25, and the sixth one-way valve 26 can be replaced by any one of a solenoid valve, a throttling mechanism with a shutoff function (e.g., an electronic expansion valve), or a flow regulating mechanism. The flow control valve 9 can be a solenoid valve (especially a normally open solenoid valve, whose brand can be any one of Sanhua, Dunan, Japan Miyagi, Danfoss, and Kale), or other flow regulating mechanisms with a shutoff function, and the material of the valve body is copper or stainless steel.

[0145] In the schemes of all the above embodiments of the present invention, any one or both of the low-pressure stage 1-1 of the compression mechanism 1 and the high-pressure stage 1-2 of the compression mechanism 1 can adopt any one of the following compressors: scroll compressor, screw compressor, rolling rotor compressor, vane compressor, rotary vane compressor, centrifugal compressor, digital scroll compressor; any one or both of the low-pressure stage 1-1 of the compression mechanism 1 and the high-pressure stage 1-2 of the compression mechanism 1 can also be a variable capacity compressor (for example: variable frequency compressor, digital scroll compressor), or a fixed speed compressor.

[0146] In all the above-mentioned embodiments of the present invention, the low-pressure stage 1-1 of the compression mechanism 1 and the high-pressure stage 1-2 of the compression mechanism 1 may also be a compressor group composed of at least two variable-capacity compressors, or a compressor group composed of at least two constant-speed compressors; in addition, the low-pressure stage 1-1 of the compression mechanism 1 and the high-pressure stage 1-2 of the compression mechanism 1 may also be a compressor group composed of at least one variable-capacity compressor and at least one constant-speed compressor.

[0147] In addition, the compression mechanism 1 can be a single-stage compressor and adopt any one of the following compressors: scroll compressor, screw compressor, rolling rotor compressor, vane compressor, rotary vane compressor, centrifugal compressor, digital scroll compressor; the compression mechanism 1 can also be a variable capacity compressor (for example: variable frequency compressor, digital scroll compressor), or a fixed speed compressor. The first four-way valve 70 and the second four-way valve 80 can adopt any one of the following brands, Sanhua, Dunan, Japan Miyagi, Danfoss, Carle, New Sanrong, etc., and the valve body material can be copper or stainless steel, or carbon steel; when reversing, they all realize reversing through the power-on and power-off operation of a small electromagnetic pilot valve, or electric reversing, such as: bistable electronic four-way reversing valve.

[0148] In all the above embodiments of the present invention, any one of the first outdoor heat exchanger 4, the second outdoor heat exchanger 5 or the heater 3 can be a refrigerant-air heat exchanger, a refrigerant-water heat exchanger or other types of heat exchangers; when used as a refrigerant-water heat exchanger, any one of a volumetric heat exchanger, a plate heat exchanger, a shell and tube heat exchanger or a sleeve heat exchanger can be used. When any one of the first outdoor heat exchanger 4, the second outdoor heat exchanger 5 or the heater 3 is used as a refrigerant-air heat exchanger, a finned heat exchanger is usually used, and the fins of the finned heat exchanger are generally made of aluminum or aluminum alloy, and copper is also used in some special occasions.

[0149] In all the above embodiments of the present invention, one or more, or even all of the first throttling mechanism 6, the second throttling mechanism 7, and the third throttling mechanism 8 can be replaced by a throttling mechanism with a shut-off function (for example, an electronic expansion valve, whose brand can be any one of Sanhua, Dun'an, Japan Miyagi, Danfoss, and Carel).

[0150] In all the above embodiments of the present invention, all the pipes are copper pipes; the economizer 10 can be any one of a volumetric heat exchanger, a plate heat exchanger, a shell and tube heat exchanger or a sleeve heat exchanger, and its material is copper, copper alloy or stainless steel; or titanium metal.

Claims

1. An air source heat pump, comprising a compression mechanism (1), a first four-way valve (70), a second four-way valve (80), a first outdoor heat exchanger (4), a second outdoor heat exchanger (5), a heater (3), a first throttling mechanism (6), a second throttling mechanism (7), a third throttling mechanism (8), a first check valve (21), and a second check valve (22), wherein: The air source heat pump further comprises a flow direction control valve (9), a third one-way valve (23), and a fourth one-way valve (24); The low-pressure node (73) of the first four-way valve (70) is connected to the low-pressure node (83) of the second four-way valve (80) via a sixty-fifth pipeline (65); the high-pressure node (71) of the first four-way valve (70) is connected in sequence via a sixty-fifth pipeline (60), the outlet end of the compression mechanism (1), the inlet end of the compression mechanism (1) and the sixty-fifth pipeline (65) between the low-pressure node (73) of the first four-way valve (70) and the low-pressure node (83) of the second four-way valve (80); the high-pressure node (81) of the second four-way valve (80) is connected to a sixty-fifth pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the first four-way valve (70) via a fifty-ninth pipeline (59); The first switching node (82) of the second four-way valve (80) is connected to the first switching node (72) of the first four-way valve (70) via the inlet end of the first one-way valve (21), the outlet end of the first one-way valve (21), the outlet end of the second one-way valve (22), and the inlet end of the second one-way valve (22) in sequence; The second reversing node (84) of the second four-way valve (80) is connected to the second reversing node (74) of the first four-way valve (70) via a sixty-seventh pipeline (67), a second outdoor heat exchanger (5), a second throttling mechanism (7), a sixty-sixth pipeline (66), a first throttling mechanism (6), a first outdoor heat exchanger (4), and a sixty-fourth pipeline (64) in sequence; The inlet end of the heater (3) is connected to the pipeline between the outlet end of the first one-way valve (21) and the outlet end of the second one-way valve (22) through a fifty-first pipeline (51), and the outlet end of the heater (3) is connected to the sixty-sixth pipeline (66) between the first throttling mechanism (6) and the second throttling mechanism (7) through a fifty-fifth pipeline (55); One end of the flow control valve (9) is connected to the pipeline at the outlet end of the heater (3), and the other end of the flow control valve (9) is connected to the middle air supply port (A) of the compression mechanism (1) through the third throttling mechanism (8) and the fifty-second pipeline (52) in sequence; The inlet end of the third one-way valve (23) is connected to the pipeline between the second outdoor heat exchanger (5) and the second throttling mechanism (7), and the outlet end of the third one-way valve (23) is connected to the pipeline between the first outdoor heat exchanger (4) and the first throttling mechanism (6) via the outlet end of the fourth one-way valve (24) and the inlet end of the fourth one-way valve (24) in sequence; One end of the fifty-fourth pipeline (54) is connected to the pipeline between the flow control valve (9) and the third throttling mechanism (8), and the other end of the fifty-fourth pipeline (54) is connected to the pipeline between the outlet end of the third one-way valve (23) and the outlet end of the fourth one-way valve (24).

2. The air source heat pump according to claim 1, characterized in that An inlet end of the high-pressure side of an economizer (10) is connected to an outlet end of the heater (3), and the outlet end of the high-pressure side of the economizer (10) is connected to a sixty-sixth pipeline (66) between the second throttling mechanism (7) and the first throttling mechanism (6) through a fifty-fifth pipeline (55); one end of the flow control valve (9) is connected to a pipeline at the outlet end or the inlet end of the high-pressure side of the economizer (10), and the other end of the flow control valve (9) is connected to the inlet end of the low-pressure side of the economizer (10) through the third throttling mechanism (8), and the outlet end of the low-pressure side of the economizer (10) is connected to the middle air supply port (A) of the compression mechanism (1) through a fifty-second pipeline (52).

3. The air source heat pump according to any one of claims 1 or 2, characterized in that The flow direction control valve (9) is a solenoid valve.

4. The air source heat pump according to claim 3, characterized in that The solenoid valve is a normally open solenoid valve.

5. An air source heat pump, comprising a compression mechanism (1), a first four-way valve (70), a second four-way valve (80), a first outdoor heat exchanger (4), a second outdoor heat exchanger (5), a heater (3), a first throttling mechanism (6), a third throttling mechanism (8), a first check valve (21), and a second check valve (22), wherein: The air source heat pump further comprises a flow control valve (9), a third one-way valve (23), a fourth one-way valve (24), a fifth one-way valve (25), and a sixth one-way valve (26); The low-pressure node (73) of the first four-way valve (70) is connected to the low-pressure node (83) of the second four-way valve (80) via a sixty-fifth pipeline (65); the high-pressure node (71) of the first four-way valve (70) is connected in sequence via a sixty-fifth pipeline (60), the outlet end of the compression mechanism (1), the inlet end of the compression mechanism (1) and the sixty-fifth pipeline (65) between the low-pressure node (73) of the first four-way valve (70) and the low-pressure node (83) of the second four-way valve (80); the high-pressure node (81) of the second four-way valve (80) is connected to a sixty-fifth pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the first four-way valve (70) via a fifty-ninth pipeline (59); The first switching node (82) of the second four-way valve (80) is connected to the first switching node (72) of the first four-way valve (70) via the inlet end of the first one-way valve (21), the outlet end of the first one-way valve (21), the outlet end of the second one-way valve (22), and the inlet end of the second one-way valve (22) in sequence; The second reversing node (84) of the second four-way valve (80) is connected to the second reversing node (74) of the first four-way valve (70) via the sixty-seventh pipeline (67), the second outdoor heat exchanger (5), the outlet end of the sixth one-way valve (26), the inlet end of the sixth one-way valve (26), the sixty-sixth pipeline (66), the inlet end of the fifth one-way valve (25), the outlet end of the fifth one-way valve (25), the first outdoor heat exchanger (4), and the sixty-fourth pipeline (64) in sequence; The inlet end of the heater (3) is connected to the pipeline between the outlet end of the first one-way valve (21) and the outlet end of the second one-way valve (22) through a fifty-first pipeline (51), and the outlet end of the heater (3) is connected to the inlet end of the fifth one-way valve (25) and the inlet end of the sixth one-way valve (26) through the first throttling mechanism (6) and the fifty-fifth pipeline (55) in sequence. One end of the flow control valve (9) is connected to a pipeline between the outlet end of the heater (3) and the first throttling mechanism (6), and the other end of the flow control valve (9) is connected to the middle air supply port (A) of the compression mechanism (1) via the third throttling mechanism (8) and the fifty-second pipeline (52) in sequence; The inlet end of the third one-way valve (23) is connected to the pipeline between the second outdoor heat exchanger (5) and the outlet end of the sixth one-way valve (26), and the outlet end of the third one-way valve (23) is connected to the pipeline between the first outdoor heat exchanger (4) and the outlet end of the fifth one-way valve (25) in sequence through the outlet end of the fourth one-way valve (24) and the inlet end of the fourth one-way valve (24); One end of the fifty-fourth pipeline (54) is connected to the pipeline between the flow control valve (9) and the third throttling mechanism (8), and the other end of the fifty-fourth pipeline (54) is connected to the pipeline between the outlet end of the third one-way valve (23) and the outlet end of the fourth one-way valve (24).

6. The air source heat pump according to claim 5, characterized in that An inlet end of the high-pressure side of an economizer (10) is connected to an outlet end of the heater (3), and the outlet end of the high-pressure side of the economizer (10) is connected to a sixty-sixth pipeline (66) between an inlet end of a fifth check valve (25) and an inlet end of a sixth check valve (26) in sequence through a first throttling mechanism (6) and a fifty-fifth pipeline (55); one end of the flow control valve (9) is connected to a pipeline at the outlet end or the inlet end of the high-pressure side of the economizer (10), and the other end of the flow control valve (9) is connected to an inlet end of the low-pressure side of the economizer (10) through the third throttling mechanism (8), and the outlet end of the low-pressure side of the economizer (10) is connected to an intermediate air supply port (A) of a compression mechanism (1) through a fifty-second pipeline (52).

7. The air source heat pump according to any one of claims 5 or 6, characterized in that The flow direction control valve (9) is a solenoid valve.

8. The air source heat pump according to claim 7, characterized in that The solenoid valve is a normally open solenoid valve.

9. The air source heat pump according to any one of claims 2 or 6, characterized in that The economizer (10) is a plate heat exchanger.

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