A refrigeration system with defrosting function and a defrosting method thereof

Abstract

The present application belongs to the field of refrigeration system, and particularly relates to a refrigeration system with defrosting function and a defrosting method thereof. The defrosting method comprises: refrigerant flowing out from the compressor outlet enters the vortex tube inlet, high-temperature refrigerant separated from the vortex tube hot end outlet flows into the outdoor heat exchanger for defrosting, low-temperature refrigerant separated from the vortex tube cold end outlet flows into the regenerator, defrosted refrigerant flows out from the outdoor heat exchanger and enters the regenerator, in the regenerator, refrigerant separated from the vortex tube cold end outlet and refrigerant flowing out from the outdoor heat exchanger are mixed and heat exchanged in the regenerator, and then flow out, mixed refrigerant enters the liquid storage tank, and finally returns to the compressor. The present application can improve the refrigerant temperature during defrosting, which is beneficial to rapid defrosting; meanwhile, the indoor heat exchanger is bypassed, and indoor temperature will not decrease greatly during defrosting.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration systems, and particularly relates to a refrigeration system with defrosting function and a defrosting method thereof. Background Technology

[0002] Currently, air source heat pump air conditioners are widely used, but in cold winters, frost will form on the surface of the heat exchanger of the outdoor unit of an air source heat pump air conditioner. The frost layer will deteriorate the heating performance of the air source heat pump air conditioner. Therefore, air source heat pump air conditioners need to be defrosted during operation.

[0003] Common defrosting methods include reverse cycle defrosting, hot gas bypass defrosting, heat storage defrosting, and electric heating defrosting. Reverse cycle defrosting is widely used due to its simple system and fast defrosting time. However, reverse cycle defrosting also has significant drawbacks. During reverse cycle defrosting, the refrigerant flow direction changes, causing heating to stop and absorbing heat from the room, resulting in a significant drop in indoor temperature and a decrease in user thermal comfort. In addition, during reverse cycle defrosting, the indoor heat exchanger pipe temperature drops sharply, resulting in a longer pipe temperature recovery time and heating recovery time. Summary of the Invention

[0004] In view of this, the present invention provides a refrigeration system with defrosting function and a defrosting method thereof to solve the problems of significant drop in indoor temperature during reverse cycle defrosting and long recovery time of indoor heat exchanger tube temperature and heating recovery time in the prior art.

[0005] This invention provides a defrosting method for a refrigeration system, wherein the refrigeration system is a heat pump refrigeration system, and the refrigeration system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a vortex tube, a regenerator, a throttling device, a control valve assembly, and a liquid receiver.

[0006] When defrosting is required, the control valve assembly is controlled to put the refrigeration system into a cooling state, so that the refrigerant flowing out of the compressor outlet does not flow into the outdoor heat exchanger but enters the vortex tube (M 230256CNI-ZLSQ20232309).

[0007] The high-temperature refrigerant separated from the hot end outlet of the vortex tube flows into the outdoor heat exchanger for defrosting, while the low-temperature refrigerant separated from the cold end outlet of the vortex tube flows into the regenerator. The defrosted refrigerant flows out of the outdoor heat exchanger but does not enter the throttling device or the indoor heat exchanger; instead, it enters the regenerator. Inside the regenerator, the refrigerant separated from the cold end outlet of the vortex tube and the refrigerant flowing out of the outdoor heat exchanger mix and exchange heat before flowing out. The mixed refrigerant enters the liquid receiver tank, where it undergoes gas-liquid separation. The gaseous refrigerant returns to the compressor.

[0008] Wherein: the refrigerant flowing out of the compressor outlet is a high-temperature and high-pressure refrigerant; the temperature of the refrigerant separated from the hot end outlet of the vortex tube is higher than that of the refrigerant flowing out of the compressor outlet; the temperature of the refrigerant separated from the cold end outlet of the vortex tube is lower than that of the refrigerant flowing out of the compressor outlet, but higher than that of the refrigerant flowing out of the outdoor heat exchanger after defrosting.

[0009] Further optionally, during conventional heating, the control valve assembly is controlled to put the refrigeration system in heating mode, and the refrigerant flowing out of the compressor outlet flows sequentially through the four-way reversing valve, the indoor heat exchanger, the throttling device, the outdoor heat exchanger, the four-way reversing valve, the liquid receiver, and finally returns to the compressor;

[0010] During conventional refrigeration, the control valve assembly is used to keep the refrigeration system in a refrigeration state. The refrigerant flowing out of the compressor outlet flows sequentially through the four-way reversing valve, the outdoor heat exchanger, the throttling device, the indoor heat exchanger, the four-way reversing valve, and the liquid receiver, and finally returns to the compressor.

[0011] This invention provides a refrigeration system with a defrosting function. The refrigeration system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a liquid receiver, an outdoor fan, an indoor fan, a vortex tube, a regenerator, a four-way reversing valve, a throttling device, and a control valve assembly.

[0012] The control valve assembly includes a first control valve, a second control valve, a third control valve, a fourth control valve, and a fifth control valve. The vortex tube has a refrigerant inlet end, a high-temperature outlet end, and a low-temperature outlet end.

[0013] The four-way directional valve has four ports, namely the first port, the second port, the third port, and the fourth port.

[0014] The system has four ports. When the refrigeration system is in conventional cooling operation and defrosting mode, the first port and the second port are connected, and the third port and the fourth port are connected. When the refrigeration system is in conventional heating operation, the first port and the third port are connected, and the second port and the fourth port are connected.

[0015] The compressor outlet is connected to the refrigerant flow path L AB At one end, the refrigerant flow path L AB The other end is connected to the first port of the four-way reversing valve, and the second port of the four-way reversing valve is connected to the refrigerant flow path L. CD At one end, the refrigerant flow path L CD The other end is connected to the refrigerant flow path port of the outdoor heat exchanger, and the other refrigerant flow path port of the outdoor heat exchanger is connected to the refrigerant flow path L.EF At one end, the refrigerant flow path L EF The other end is connected to the refrigerant flow path port of the throttling device, and the other refrigerant flow path port of the throttling device is connected to the refrigerant flow path L. GH At one end, the refrigerant flow path L GH The other end is connected to the refrigerant flow path port of the indoor heat exchanger, and the other refrigerant port of the indoor heat exchanger is connected to the refrigerant flow path L. IJ One end of the L IJ The other end is connected to the third port of the four-way reversing valve, and the fourth port of the four-way reversing valve is connected to the refrigerant flow path L. KL At one end, the refrigerant flow path L KL The other end is connected to the refrigerant inlet of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is connected to the refrigerant flow path L. MN At one end, the refrigerant flow path L MN The other end is connected to the compressor inlet.

[0016] The refrigerant flow path L CD A first control valve is provided, and the inlet end of the vortex tube is connected to the refrigerant flow path L. CD A branch line S1 is connected, and the branch line S1 is connected to the refrigerant flow path L. CD The connection point is located between the second port of the four-way reversing valve and the first control valve. The second control valve is provided on the branch S1. The high-temperature outlet end of the vortex tube is connected to the refrigerant flow path L. CD A branch line S2 is connected to the refrigerant flow path L. CD The connection point is located between the outdoor heat exchanger and the first control valve. The third control valve is located on the branch S2. The refrigerant flow path of the regenerator has a first port, a second port, a third port, and a fourth port. The first port is connected to the second port, and the third port is connected to the fourth port. The first port is connected to the low-temperature outlet of the vortex tube through the branch S3. The third port is connected to the refrigerant M 230256CNI-ZLSQ20232309 through the branch S4.

[0017] Flow path L EF The refrigerant flowing into the regenerator from its first port and the refrigerant flowing into its third port exchange heat within the regenerator and then flow out from the second port and the fourth port respectively. The refrigerant flowing out from the second port and the refrigerant flowing out from the fourth port merge and then connect to the refrigerant pipeline L via branch S5. IJ The fifth control valve is located on branch S5.

[0018] Alternatively, the outdoor heat exchanger is equipped with an outdoor fan, and the indoor heat exchanger is equipped with an indoor fan.

[0019] This invention provides a defrosting method using the above-described refrigeration system, which detects whether the outdoor heat exchanger has reached a preset defrosting condition.

[0020] If so, control the four-way reversing valve to put the refrigerant flow of the refrigeration system into a refrigeration operation state, open the second control valve, the third control valve, the fourth control valve, and the fifth control valve, and close the first control valve, the throttling device, the internal fan, and the external fan to put the refrigeration system into a defrosting state until the defrosting exit conditions are met.

[0021] Alternatively, the detection of whether the outdoor heat exchanger has reached the preset defrosting condition is performed when the refrigeration system is in conventional heating mode.

[0022] Alternatively, after the refrigeration system reaches the defrost exit condition, the four-way reversing valve is controlled to direct the refrigerant flow of the refrigeration system to the heating operation state, thus restoring traditional heating.

[0023] Further optionally, in the conventional heating state of the refrigeration system, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the first control valve, the throttling device, the internal fan, and the external fan are closed.

[0024] This invention provides an air source heat pump air conditioner that uses the above-described method for defrosting or the above-described refrigeration system.

[0025] Compared with the prior art, the main advantages of the present invention are as follows:

[0026] (1) This invention utilizes the thermal separation effect of vortex tubes. The high-temperature exhaust gas from the compressor first expands and undergoes thermal separation within the vortex tube. The even higher-temperature gas at the high-temperature outlet of the vortex tube directly enters the outdoor heat exchanger. (M 230256CNI-ZLSQ20232309)

[0027] Frost can increase the refrigerant temperature during defrosting, which is beneficial for rapid defrosting;

[0028] (2) During defrosting, the indoor heat exchanger is bypassed, and the low-temperature refrigerant after defrosting will not flow through the indoor heat exchanger, will not absorb heat from the indoor environment, and will not cause a significant drop in indoor temperature during traditional reverse cycle defrosting.

[0029] (3) Applying this patent can solve the problem of long heating recovery time of indoor heat exchanger tube temperature during traditional reverse cycle defrosting. Attached Figure Description

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0032] Figure 1 This is a schematic diagram of the refrigerant flow direction in a refrigeration system according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic flowchart of a defrosting control method according to an embodiment of the present invention. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The terminology used in this embodiment of the invention is for the purpose of describing particular embodiments only, and not M230256CNI-ZLSQ20232309.

[0036] This is intended to limit the scope of the invention. The singular forms “a,” “the,” and “the” used in the embodiments of the invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0037] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0038] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0039] Example 1

[0040] Embodiment 1 of the present invention provides a defrosting method for a refrigeration system. The refrigeration system is a heat pump refrigeration system. The refrigeration system includes a compressor 1, a four-way reversing valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 5, a vortex tube 9, a regenerator 10, a throttling device 4, a control valve assembly, and a liquid storage tank 6.

[0041] When defrosting is required, the control valve assembly is controlled to put the refrigeration system into a cooling state. The refrigerant flowing out of the compressor 1 outlet does not flow into the outdoor heat exchanger 5 but enters the inlet of the vortex tube 9. The high-pressure, high-temperature refrigerant expands in the vortex tube and is separated using the heat separation effect of the vortex tube. The high-temperature refrigerant separated from the high-temperature outlet 91 of the vortex tube flows into the outdoor heat exchanger 5 for defrosting, and the low-temperature refrigerant separated from the low-temperature outlet 92 of the vortex tube flows into the regenerator 10. The regenerator 10 should be a compact heat exchanger with high heat exchange efficiency. Preferably, the regenerator 10 is a microchannel heat exchanger. The defrosted refrigerant flows out of the outdoor heat exchanger 5 and does not enter the throttling device 4 and the indoor heat exchanger 3 but enters the regenerator 10. In the regenerator 10, the refrigerant separated from the low-temperature outlet 92 of the vortex tube and the refrigerant flowing out of the outdoor heat exchanger 5 are separated.

[0042] The refrigerant mixes and exchanges heat in the regenerator 10 before flowing out, thereby increasing the temperature of the refrigerant after defrosting and regulating the temperature of the refrigerant entering the compressor 1. This prevents the liquid refrigerant after defrosting from directly entering the compressor 1 and causing the risk of liquid slugging. The mixed refrigerant enters the liquid storage tank 6, and after gas-liquid separation in the liquid storage tank 6, the gaseous refrigerant returns to the compressor 1.

[0043] Wherein: the refrigerant flowing out of the compressor 1 outlet is a high-temperature and high-pressure refrigerant; the temperature of the refrigerant separated from the high-temperature outlet end 91 of the vortex tube is higher than that of the refrigerant flowing out of the compressor 1 outlet; the temperature of the refrigerant separated from the low-temperature outlet end 92 of the vortex tube is lower than that of the refrigerant flowing out of the compressor 1 outlet, but higher than that of the refrigerant flowing out of the outdoor heat exchanger 5 after defrosting.

[0044] At the same time, the external fan 7 is turned off to prevent heat from being carried away from the surface of the heat exchange tubes of the outdoor heat exchanger 5; the internal fan 8 is turned off to prevent cold air from blowing into the room during defrosting.

[0045] Compared to traditional reverse-cycle defrosting, the solution proposed in Embodiment 1 of this invention can increase the temperature of the refrigerant entering the outdoor heat exchanger 5 for defrosting, thereby enabling rapid defrosting. Furthermore, the indoor heat exchanger 3 is bypassed, so the low-temperature refrigerant after defrosting does not directly pass through it, preventing a significant drop in the pipe temperature of the indoor heat exchanger 3. This facilitates faster recovery of the pipe temperature and heating operation of the indoor heat exchanger 3. Simultaneously, the low-temperature refrigerant after defrosting does not absorb significant heat from the indoor environment, preventing a substantial drop in indoor temperature and helping to maintain indoor thermal comfort during defrosting.

[0046] Optionally, in one implementation of this embodiment 1, in addition to the solution proposed in this embodiment 1, it also includes conventional heating and conventional cooling. When conventional heating is used, the control valve assembly is controlled to put the cooling system in heating mode, the outdoor fan 7 and the indoor fan 8 are turned on, and the refrigerant flowing out of the compressor 1 flows sequentially through the four-way reversing valve 2, the indoor heat exchanger 3, the throttling device 4, the outdoor heat exchanger 5, the four-way reversing valve 2, the liquid storage tank 6, and finally returns to the compressor 1;

[0047] During conventional refrigeration, the control valve assembly is used to put the refrigeration system into a refrigeration state. The outdoor fan 7 and the indoor fan 8 are turned on, and the refrigerant flowing from the compressor 1 outlet flows sequentially through the four-way reversing valve 2, the outdoor heat exchanger 5, the throttling device 4, the indoor heat exchanger 3, and the four-way reversing valve 2.

[0048] The refrigerant flows through reversing valve 2, the liquid receiver 6, and finally returns to compressor 1. The high-temperature refrigerant at the outlet of compressor 1 first flows to the outdoor heat exchanger 5 for condensation. The condensed high-pressure low-temperature refrigerant is then throttled and depressurized in the throttling device 4. The throttled low-pressure low-temperature refrigerant then enters the indoor heat exchanger 3 to absorb heat from the indoor environment and evaporate. The refrigerant then returns to the liquid receiver 6 and finally back to compressor 1.

[0049] The control method for starting and stopping defrosting is preferably a temperature-based defrosting control method, a temperature-time defrosting control method, or a temperature-humidity-time defrosting control method.

[0050] Example 2

[0051] Embodiment 2 of the present invention provides a refrigeration system with a defrosting function, such as Figure 1 As shown, the refrigeration system includes a compressor 1, an indoor heat exchanger 3, an outdoor heat exchanger 5, a liquid receiver 6, an outdoor fan 7, an indoor fan 8, a vortex tube 9, a regenerator 10, a four-way reversing valve 2, a throttling device 4, and a control valve assembly, wherein...

[0052] The control valve assembly includes a first control valve 11, a second control valve 12, a third control valve 13, a fourth control valve 14, and a fifth control valve 15. The vortex tube has a refrigerant inlet end 93, a high-temperature outlet end 91, and a low-temperature outlet end 92.

[0053] The four-way directional valve 2 has four ports, namely port B, port C, and port J.

[0054] The fourth port K is connected as follows: When the refrigeration system is in conventional refrigeration operation and defrosting mode, the first port B and the second port C are connected, and the third port J and the fourth port K are connected; when the refrigeration system is in conventional heating operation, the first port B and the third port J are connected, and the second port C and the fourth port K are connected.

[0055] The compressor 1 outlet is connected to the refrigerant flow path L. AB At one end, the refrigerant flow path L AB The other end is connected to the first port B of the four-way reversing valve 2, and the second port C of the four-way reversing valve 2 is connected to the refrigerant flow path L. CD At one end, the refrigerant flow path L CD The other end is connected to the refrigerant flow port D of the outdoor heat exchanger 5, and the other refrigerant flow port E of the outdoor heat exchanger 5 is connected to the refrigerant flow path L. EF At one end, the refrigerant flow path L EF The other end is connected to the refrigerant flow path port F of the throttling device 4, and the other refrigerant flow path port G of the throttling device 4 is connected to the refrigerant flow path L. GH M 230256CNI-ZLSQ20232309

[0056] End, the refrigerant flow path L GH The other end is connected to the refrigerant flow path port H of the indoor heat exchanger 3, and the other refrigerant port I of the indoor heat exchanger 3 is connected to the refrigerant flow path L. IJ One end of the LIJ The other end is connected to the third port J of the four-way reversing valve 2, and the fourth port K of the four-way reversing valve 2 is connected to the refrigerant flow path L. KL At one end, the refrigerant flow path L KL The other end is connected to the refrigerant inlet L of the liquid storage tank 6, and the refrigerant outlet M of the liquid storage tank 6 is connected to the refrigerant flow path L. MN At one end, the refrigerant flow path L MN The other end is connected to the inlet N of the compressor 1.

[0057] The refrigerant flow path L CD A first control valve 11 is provided, and the vortex tube inlet 93 is connected to the refrigerant flow path L. CD A branch line S1 is connected, and the branch line S1 is connected to the refrigerant flow path L. CD The connection point is located between the second port of the four-way reversing valve 2 and the first control valve 11. The second control valve 12 is provided on the branch S1. The high-temperature outlet 91 of the vortex tube is connected to the refrigerant flow path L. CD A branch line S2 is connected to the refrigerant flow path L. CD The connection point is located between the outdoor heat exchanger 5 and the first control valve 11. The third control valve 13 is located on the branch S2. The refrigerant flow path of the regenerator 10 has a first port a, a second port b, a third port c, and a fourth port d. The first port a is connected to the second port b, and the third port c is connected to the fourth port d. The first port a is connected to the low-temperature outlet 92 of the vortex tube through the branch S3. The third port c is connected to the refrigerant flow path L through the branch S4. EF The refrigerant flowing into the regenerator 10 from its first port a and the refrigerant flowing into its third port c exchange heat within the regenerator 10 and then flow out from its second port b and the fourth port d, respectively. The refrigerant flowing out from the second port b and the refrigerant flowing out from the fourth port d merge and then connect to the refrigerant pipeline L via branch S5. IJ The fifth control valve 15 is installed on the branch S5. See the relevant description in Embodiment 1 for details.

[0058] Optionally, in one implementation of this embodiment 2, the outdoor heat exchanger 5 is equipped with an outdoor fan 7, and the indoor heat exchanger 3 is equipped with an indoor fan 8. See the relevant description in embodiment 1 for details.

[0059] Example 3

[0060] Embodiment 3 of the present invention provides a defrosting method using the above-described refrigeration system, such as... Figure 2As shown, the test result is M230256CNI-ZLSQ20232309.

[0061] Test whether the outdoor heat exchanger 5 has met the preset defrosting conditions.

[0062] If so, the four-way reversing valve 2 is controlled to put the refrigerant flow of the refrigeration system into a refrigeration operation state, and the second control valve 12, the third control valve 13, the fourth control valve 14, the fifth control valve 15 are opened, while the first control valve 11, the throttling device 4, the internal fan 8, and the external fan 7 are closed, so that the refrigeration system is in a defrosting state until the defrosting exit conditions are met. See the relevant description in Embodiment 2 for details.

[0063] Optionally, in one implementation of this embodiment 3, the detection of whether the outdoor heat exchanger 5 has reached the preset defrosting condition is performed when the refrigeration system is in conventional heating mode. See the relevant description in embodiment 2 for details.

[0064] Optionally, in one implementation of this embodiment 3, after the refrigeration system reaches the defrost exit condition, the four-way reversing valve 2 is controlled to direct the refrigerant flow of the refrigeration system to the heating operation state, restoring traditional heating. See the relevant description in embodiment 2 for details.

[0065] Optionally, in one implementation of this embodiment 3, under the conventional heating state of the refrigeration system, the second control valve 12, the third control valve 13, the fourth control valve 14, and the fifth control valve 15 are closed, and the first control valve 11, the throttling device 4, the internal fan 8, and the external fan 7 are opened. See the relevant description in embodiment 2 for details.

[0066] Example 4

[0067] Embodiment 4 of the present invention provides an air source heat pump air conditioner, which includes a compressor 1, a four-way reversing valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 5, a vortex tube 9, a regenerator 10, a throttling device 4, a control valve assembly, a liquid storage tank 6, an outdoor fan 7, and an indoor fan 8. For a detailed description of the air conditioner structure and defrosting method, please refer to the previous text, which will not be repeated here.

[0068] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A refrigeration system with a defrosting function, characterized in that, The refrigeration system comprises a compressor (1), an indoor heat exchanger (3), an outdoor heat exchanger (5), a liquid storage tank (6), an outdoor fan (7), an indoor fan (8), a vortex tube (9), a regenerator (10), a four-way reversing valve (2), a throttling device (4), and a control valve assembly, wherein... The control valve assembly includes a first control valve (11), a second control valve (12), a third control valve (13), a fourth control valve (14), and a fifth control valve (15). The vortex tube (9) has a refrigerant inlet end (93), a high-temperature outlet end (91), and a low-temperature outlet end (92). The four-way reversing valve (2) has four ports: a first port (B), a second port (C), a third port (J), and a fourth port (K). When the refrigeration system is in conventional refrigeration operation and defrosting operation, the first port (B) and the second port (C) are connected, and the third port (J) and the fourth port (K) are connected. When the refrigeration system is in conventional heating operation, the first port (B) and the third port (J) are connected, and the second port (C) and the fourth port (K) are connected. The compressor (1) outlet is connected to the refrigerant flow path L AB At one end, the refrigerant flow path L AB The other end is connected to the first port (B) of the four-way reversing valve (2), and the second port (C) of the four-way reversing valve (2) is connected to the refrigerant flow path L. CD At one end, the refrigerant flow path L CD The other end is connected to the refrigerant flow port D of the outdoor heat exchanger (5), and the other refrigerant flow port E of the outdoor heat exchanger (5) is connected to the refrigerant flow path L. EF At one end, the refrigerant flow path L EF The other end is connected to the refrigerant flow port F of the throttling device (4), and the other refrigerant flow port G of the throttling device (4) is connected to the refrigerant flow path L. GH At one end, the refrigerant flow path L GH The other end is connected to the refrigerant flow path port H of the indoor heat exchanger (3), and the other refrigerant port I of the indoor heat exchanger (3) is connected to the refrigerant flow path L. IJ One end of the L IJ The other end is connected to the third port (J) of the four-way reversing valve (2), and the fourth port (K) of the four-way reversing valve (2) is connected to the refrigerant flow path L. KL At one end, the refrigerant flow path L KL The other end is connected to the refrigerant inlet L of the liquid storage tank (6), and the refrigerant outlet M of the liquid storage tank (6) is connected to the refrigerant flow path L. MN At one end, the refrigerant flow path L MN The other end is connected to the inlet N of the compressor (1). The refrigerant flow path L CD A first control valve (11) is provided, and the refrigerant inlet end (93) of the vortex tube is connected to the refrigerant flow path L. CD A branch line S1 is connected, and the branch line S1 is connected to the refrigerant flow path L. CD The connection point is located between the second port (C) of the four-way reversing valve (2) and the first control valve (11). The second control valve (12) is provided on the branch S1. The high-temperature gas outlet (91) of the vortex tube is connected to the refrigerant flow path L. CD A branch line S2 is connected to the refrigerant flow path L. CD The connection point is located between the outdoor heat exchanger (5) and the first control valve (11). The third control valve (13) is located on the branch S2. The refrigerant flow path of the regenerator (10) is provided with a first port (a), a second port (b), a third port (c), and a fourth port (d). The first port (a) is connected to the second port (b), and the third port (c) is connected to the fourth port (d). The first port (a) is connected to the low-temperature outlet end (92) of the vortex tube through the branch S3. The third port (c) is connected to the refrigerant flow path L through the branch S4. EF The branch S4 is connected to the refrigerant flow path L. The refrigerant flowing into the refrigerant regenerator (10) through its first port (a) and the refrigerant flowing into the refrigerant regenerator (10) through its third port (c) exchange heat in the refrigerant regenerator (10) and then flow out through the second port (b) and the fourth port (d) respectively. The refrigerant flowing out of the second port (b) and the refrigerant flowing out of the fourth port (d) merge and are then connected to the refrigerant flow path L through the branch S5. IJ The fifth control valve (15) is located on the branch S5.

2. The refrigeration system according to claim 1, characterized in that, The outdoor heat exchanger (5) is equipped with an outdoor fan (7), and the indoor heat exchanger (3) is equipped with an indoor fan (8).

3. A defrosting method using the refrigeration system of claim 2, characterized in that, Check whether the outdoor heat exchanger (5) has met the preset defrosting conditions. If so, control the four-way reversing valve (2) to make the refrigerant flow of the refrigeration system in the refrigeration operation state, open the second control valve (12), the third control valve (13), the fourth control valve (14), the fifth control valve (15) and close the first control valve (11), the throttling device (4), the internal fan (8) and the external fan (7) to make the refrigeration system in the defrost state until the defrost exit condition is met.

4. The defrosting method according to claim 3, characterized in that, The detection of whether the outdoor heat exchanger (5) has reached the preset defrosting condition is performed when the refrigeration system is in the conventional heating state.

5. The defrosting method according to claim 4, characterized in that, After the refrigeration system reaches the condition to exit defrost, it controls the four-way reversing valve (2) to make the refrigerant flow of the refrigeration system in the heating operation state, and restore the traditional heating.

6. The defrosting method according to claim 5, characterized in that, In the conventional heating state of the refrigeration system, the second control valve (12), the third control valve (13), the fourth control valve (14), the fifth control valve (15) are closed, and the first control valve (11), the throttling device (4), the internal fan (8), and the external fan (7) are opened.

7. An air source heat pump air conditioner, characterized in that, Defrosting is performed using the method described in any one of claims 3-6, or using the refrigeration system described in any one of claims 1-2.

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