Air conditioning unit and control method thereof

Abstract

The application discloses an air conditioning unit and a control method thereof, wherein the air conditioning unit comprises a compressor, a four-way valve, an evaporator, a throttling device, a condenser, and a heat storage module which is arranged in parallel with the evaporator; the compressor, the four-way valve, the evaporator, the throttling device and the condenser are sequentially connected to form a main circulation loop; the compressor, the four-way valve, the heat storage module, the throttling device and the condenser are sequentially connected to form a heat storage branch; and the heat storage module is further sequentially connected with the condenser, the compressor and the four-way valve to form a hot gas bypass defrosting branch. The application solves the problem of indoor temperature drop and poor comfort in the defrosting process of the air conditioner in the prior art, realizes continuous heating of the air conditioning unit, and improves the comfort of users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to an air conditioning unit and a control method thereof. BACKGROUND

[0002] The existing heat pump air conditioning unit generally comprises a compressor, a four-way valve, a condenser, a throttling device, an evaporator and the like functional components. The air conditioning unit realizes the refrigeration or heating function of the air conditioner through switching of the four-way valve. When the air conditioner operates in the heating function, the low-temperature refrigerant needs to absorb heat from the outdoor condenser. When the outdoor temperature is relatively low and reaches a certain condition, it is considered that the outdoor condenser will be frosted. With the gradual increase in the thickness of the frost layer, the outdoor condenser is gradually blocked from absorbing heat from the outdoor air, which seriously affects the heating effect. At this time, the outdoor condenser needs to be defrosted.

[0003] The existing defrosting mode is as follows: when the defrosting condition is reached, the indoor and outdoor fans are stopped, the four-way valve is reversed, the high-temperature refrigerant discharged from the compressor flows into the outdoor condenser, and the heat is released and the frost layer on the surface of the condenser is melted. During the defrosting operation, the indoor side stops heating, and on the contrary, the low-temperature refrigerant flowing due to the heat exchange of the refrigerant also flows into the indoor side and needs to absorb heat from the indoor side, which will cause the indoor temperature to drop significantly, affecting the comfort. Generally, the outdoor condenser of the air conditioner is basically unavoidable, and when the frost reaches a certain degree, it must be defrosted, which will cause the indoor temperature to drop instead of rising, and the temperature drop will affect the comfort, thereby forming a contradiction between defrosting and comfort.

[0004] To solve the contradiction between defrosting and comfort, one way is to introduce a heat storage module. The heat storage module is generally installed side by side with the indoor unit. When the air conditioning system operates in the heating mode, part of the high-temperature refrigerant flows into the heat storage module and releases heat, which is absorbed and stored by the heat storage medium in the heat storage module. When the air conditioning operates in the defrosting mode, the throttling device of the indoor unit is controlled to make most of the low-temperature refrigerant after heat release and defrosting in the condenser flow into the heat storage module and absorb the heat stored in the heat storage medium in the heat storage module, forming heat conservation, and achieving the purpose of defrosting operation cycle. Although the introduction of the heat storage module can reduce the defrosting time to a certain extent, reduce the indoor temperature fluctuation and improve the comfort, the defrosting process of the heat storage module is not essentially different from that of the general air conditioner. The indoor fan also needs to be stopped, the four-way valve also needs to be reversed, and the low-temperature refrigerant after heat exchange of the high-temperature refrigerant discharged from the compressor flowing into the outdoor condenser will still flow into the indoor side, affecting the comfort, and the air conditioning unit cannot achieve continuous heating in essence.

[0005] In view of the problem of indoor temperature drop and poor comfort during the defrosting process of the air conditioner in the related art, no effective solution has been proposed so far. SUMMARY

[0006] The application provides an air conditioning unit and a control method thereof to at least solve the problem of indoor temperature drop and poor comfort in the defrosting process of the air conditioner in the prior art.

[0007] To solve the above technical problem, according to an aspect of an embodiment of the application, an air conditioning unit is provided, comprising:

[0008] a compressor, a four-way valve, an evaporator, a throttling device, and a condenser;

[0009] a heat storage module, which is connected in parallel with the evaporator;

[0010] The compressor, the four-way valve, the evaporator, the throttling device, and the condenser are sequentially connected to form a main circulation loop.

[0011] The compressor, the four-way valve, the heat storage module, the throttling device, and the condenser are sequentially connected to form a heat storage branch.

[0012] The heat storage module is further sequentially connected with the condenser, the compressor, and the four-way valve to form a hot gas bypass defrosting branch.

[0013] Further, the heat storage module comprises a first pipeline and a second pipeline which are independently arranged, the first pipeline is connected in series in the heat storage branch, and the second pipeline is connected in series in the hot gas bypass defrosting branch.

[0014] Further, the hot gas bypass defrosting branch further comprises:

[0015] a defrosting throttling device, which is arranged on a pipeline between the second pipeline and the condenser, and is used for adjusting the refrigerant flow of the hot gas bypass defrosting branch.

[0016] Further, the heat storage branch further comprises:

[0017] a heat storage control valve, which is arranged on a pipeline between the first pipeline and the condenser, and is used for controlling the on-off of the heat storage branch.

[0018] Further, the condenser has a third pipeline and a fourth pipeline which are independently arranged, the third pipeline is connected in series in the main circulation loop, and the fourth pipeline is connected in series in the hot gas bypass defrosting branch.

[0019] Further, the condenser comprises a first arrangement area and a second arrangement area, the third pipeline is arranged in the first arrangement area, and the fourth pipeline is arranged in the second arrangement area, and the first arrangement area and the second arrangement area are arranged in a spaced or staggered manner.

[0020] Further, the hot gas bypass defrosting branch further comprises:

[0021] a defrosting control valve, which is arranged on a pipeline between the fourth pipeline and the compressor, and is used for controlling the on-off of the hot gas bypass defrosting branch.

[0022] According to another aspect of the embodiments of the present application, there is provided an air conditioning unit control method applied to the air conditioning unit as described above, the method comprising:

[0023] detecting whether the condenser needs to be defrosted when the air conditioning unit is in the heating mode;

[0024] controlling the hot gas bypass defrost branch to be conducted if the condenser needs to be defrosted;

[0025] otherwise, continuing to maintain the heating mode.

[0026] Further, the controlling the hot gas bypass defrost branch to be conducted comprises:

[0027] controlling the defrost control valve to be opened.

[0028] Further, after the controlling the hot gas bypass defrost branch to be conducted, the method further comprises:

[0029] detecting the degree of frosting of the condenser;

[0030] controlling the opening degree of the defrost throttling device according to the degree of frosting; wherein the more serious the degree of frosting is, the greater the opening degree of the defrost throttling device is.

[0031] Further, before the detecting whether the condenser needs to be defrosted, the method further comprises:

[0032] controlling the heat storage control valve to be closed to control the heat storage branch to be conducted.

[0033] According to still another aspect of the embodiments of the present application, there is provided a storage medium containing computer executable instructions for executing the air conditioning unit control method as described above when executed by a computer processor.

[0034] In the present application, an air conditioning unit with a heat storage module and a hot gas bypass defrost structure is proposed, which can realize simultaneous defrosting of the condenser on the outdoor side while heating on the indoor side, and the heating on the indoor side and the defrosting of the condenser on the outdoor side coexist, the four-way valve does not need to be reversed, and the whole machine still runs in the heating cycle, thereby realizing continuous heating of the air conditioning unit and improving the comfort of users. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic structural diagram of an optional air conditioning unit according to the embodiments of the present application;

[0036] Figure 2 is another schematic structural diagram of an optional air conditioning unit according to the embodiments of the present application;

[0037] Figure 3 is an optional flow chart of an air conditioning unit control method according to the embodiments of the present application.

[0038] Reference numerals:

[0039] 1, compressor; 2, defrosting control valve; 3, four-way valve; 4, defrosting inlet pipe of condenser; 5, condenser inlet pipe; 6, condenser; 7, condenser outlet pipe; 8, throttling device; 9, defrosting throttling device; 10, heat storage module; 101, heat storage module heat storage outlet pipe; 102, heat storage throttling valve; 103, heat storage module defrosting outlet pipe; 104, heat storage module heat storage medium; 105, heat storage module heat storage inlet pipe; 106, heat storage module defrosting inlet pipe; 11, refrigerant side pipe stop valve; 12, indoor unit; 121, indoor unit throttling device; 122, evaporator; 123, indoor unit fan; 13, refrigerant liquid side pipe stop valve; 14, defrosting outlet pipe of condenser; 15, outdoor side fan; 16, defrosting pipe stop valve. DETAILED DESCRIPTION

[0040] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. In the following description, the same drawings refer to the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0041] Embodiment 1

[0042] In the preferred embodiment 1 of the present invention, an air conditioning unit is provided, in particular, Figure 1 An alternative structural schematic diagram of the unit is shown, as Figure 1 The air conditioning unit of the present invention can be seen as consisting of two parts, an indoor unit and an outdoor unit. The indoor unit consists of the indoor unit 12 alone, and the number thereof can be one or more; the rest constitutes the outdoor unit. As Figure 1 The working process of the air conditioning unit is as follows:

[0043] The main circulation loop comprises a compressor 1, a four-way valve 3, a condenser inlet pipe 5, a condenser 6, a condenser outlet pipe 7, a throttling device 8, a refrigerant side pipe stop valve 11, an indoor unit 12 (the indoor unit comprises an indoor unit throttling device 121, an evaporator 122, an indoor unit fan 123, etc.), a refrigerant liquid side pipe stop valve 13, and related connecting pipes, etc. When the main circulation loop is in heating operation, high-temperature refrigerant discharged from the compressor 1 after work is guided through the four-way valve 3, the refrigerant side pipe stop valve 11, and into the indoor unit 12, and after heat release in the evaporator 122, the indoor unit 12 is heated. Then the indoor unit 12 sequentially flows through the indoor unit throttling device 121, the refrigerant liquid side pipe stop valve 13, the throttling device 8, the condenser outlet pipe 7, the condenser 6, the condenser inlet pipe 5, the four-way valve 3, and then returns to the suction end of the compressor 1, forming a heating cycle. When the main circulation loop is in refrigeration operation, high-temperature refrigerant discharged from the compressor 1 after work enters the four-way valve 3, and after switching through the four-way valve, the high-temperature refrigerant enters the condenser 6 through the condenser inlet pipe 5, and then sequentially flows through the condenser outlet pipe 7, the throttling device 8, the refrigerant liquid side pipe stop valve 13, the indoor unit throttling device 121, and then enters the evaporator 122. After absorbing indoor heat in the evaporator 122, the indoor unit 12 is cooled. Then the indoor unit 12 sequentially flows through the refrigerant side pipe stop valve 11 and the four-way valve 3, and then returns to the suction end of the compressor 1, forming a refrigeration cycle. The outdoor unit fan and the indoor unit fan 123 are used to strengthen the air flow of the condenser 6 and the evaporator 122, and to strengthen heat exchange.

[0044] In particular, the main circulation loop comprises a heat storage branch. When the main circulation loop is in heating operation, high-temperature refrigerant flowing out of the four-way valve 3 is branched, and then flows through the heat storage module heat storage inlet pipe 105, releases heat in the module, and the released heat is absorbed and stored by the heat storage module heat storage medium 104. After heat release, the refrigerant flows through the heat storage throttling valve 102 and the heat storage module heat storage outlet pipe 101, and then flows into the main circulation loop, completing the heat storage function of the heat storage branch when the main circulation loop is in heating operation. When the main circulation loop is in refrigeration operation, the heat storage throttling valve 102 is closed, and the heat storage branch is in an open circuit state and does not participate in the circulation of the refrigeration cycle loop.

[0045] In addition, the main circulation loop comprises a heat bypass defrosting branch formed by the compressor 1, the four-way valve 3, the defrosting control valve 2, the defrosting inlet pipe 4 of the condenser, the condenser 6, the defrosting outlet pipe 14 of the condenser, the defrosting throttling device 9, the defrosting inlet pipe 106 of the heat storage module, the defrosting outlet pipe 103 of the heat storage module and the related connecting pipes. When the main circulation loop is in the heating operation and the system detects the need for defrosting, the control logic controls the defrosting control valve 2 to be open. The high-temperature refrigerant discharged from the compressor 1 and the exhaust port of the compressor flows to the defrosting control valve 2, passes through the defrosting control valve 2, flows into the condenser 6 through the defrosting inlet pipe 4 of the condenser, is defrosted on the condenser 6, and then flows into the heat storage module through the defrosting outlet pipe 14 of the condenser, the defrosting throttling device 9 and the defrosting inlet pipe 106 of the heat storage module. The heat storage medium 104 in the heat storage module is heated and defrosted. The defrosted refrigerant is converted from liquid to gas. The gaseous refrigerant is collected into the main circulation loop through the defrosting outlet pipe 103 of the heat storage module, and then returns to the suction end of the compressor 1 through the four-way valve 3, thereby completing the defrosting operation cycle. When the main refrigeration cycle is in the refrigeration mode and the system logic determines that the defrosting is not needed, the control logic makes the defrosting control valve 2 closed, so that the refrigerant cannot pass through the defrosting control valve 2, and the branch is in the closed and inoperative state.

[0046] Generally, the condenser pipe of the air conditioning system has one inlet pipe and one outlet pipe. In the present application, the condenser pipe is designed as two inlet pipes and two outlet pipes, which are the condenser inlet pipe 5, the condenser outlet pipe 7 and the defrosting inlet pipe 4 of the condenser and the defrosting outlet pipe 14 of the condenser. The two pipe parts are independent of each other in the condenser 6 and share the heat exchange components such as the fins in the condenser 6. When the system is in the heating mode and the system logic determines that the defrosting is needed, the high-temperature refrigerant discharged from the compressor 1 and the exhaust port of the compressor flows to the defrosting control valve 2, the defrosting control valve 2 is open, and the high-temperature refrigerant flows into the defrosting pipe part of the condenser 6 through the defrosting control valve 2 and the defrosting inlet pipe 4 of the condenser. The heat of the high-temperature refrigerant is conducted to the fin heat exchange components in the condenser 6 through the defrosting pipe part. Since the fin heat exchange components in the condenser 6 are of a shared and integrated structure, the heat is conducted from the high-temperature area of the fin heat exchange components to the low-temperature area along the heat exchange components, so that the frost layer in the low-temperature area of the fin heat exchange components in the condenser 6 is melted by the heat, thereby achieving the defrosting purpose. The U-tube loop distribution of the condenser refrigeration pipe part in the condenser 6 and the U-tube loop distribution of the defrosting pipe part in the condenser can be arranged in a partitioned and concentrated manner or in an interlaced manner. In order to achieve good defrosting effect, the interlaced arrangement is preferred, so that the heat is evenly distributed to each part of the fin heat exchange components in the condenser 6 during defrosting, thereby optimizing the defrosting effect.

[0047] The heat storage branch pipelines used in this invention also have an independent two-inlet, two-outlet structure. During heat storage, the refrigerant enters the heat storage module through the heat storage inlet pipe 105 and exits through the heat storage outlet pipe 101 after heat exchange. During defrosting, the refrigerant enters the heat storage module through the defrost inlet pipe 106 and exits through the defrost outlet pipe 103 after heat exchange. During both heat storage and defrosting operations, the heat storage medium 104 of the heat storage module is used for heat exchange, completing the refrigerant state transition. The heat storage module in this invention is not limited to a specific form; its characteristic is that the heat storage module pipelines are independent but share a common heat storage medium, completing heat exchange through the heat storage medium and transferring heat between the two independent pipelines in different operating states. Similarly, the heat storage medium is not limited to a specific type or form; any substance capable of heat exchange, heat storage, and heat transfer between the two independent systems is included within the scope of this invention.

[0048] As mentioned earlier, the main circulation loop heating and the hot bypass defrosting branch defrosting can operate simultaneously. That is, the indoor unit can be heated while the condenser is being defrosted at the same time. This means that defrosting is not achieved by switching the four-way valve when the air conditioner is heating. If the four-way valve is not switched, the low-temperature refrigerant will not flow into the indoor unit side. Only the high-temperature refrigerant will flow into the indoor unit. This allows the indoor unit to achieve continuous heating and improves the comfort of the air conditioner.

[0049] Furthermore, the defrosting throttling device 9 in the hot bypass defrosting branch preferentially selects an electronic expansion valve. The system logic controls the number of opening steps of the electronic expansion valve, thereby controlling the refrigerant flow in the hot bypass defrosting branch. In conjunction with the overall unit operation control logic, the number of opening steps of the electronic expansion valve is adjusted according to the degree of frost on the condenser 6. When the degree of frost is severe, the number of opening steps of the electronic expansion valve is large, the defrosting refrigerant flow is large, and the defrosting capacity is strong; conversely, when the degree of frost is not severe and the required defrosting capacity is not large, the number of opening steps of the electronic expansion valve is small, and the defrosting refrigerant flow is small. This ensures that the refrigerant flow in the main circulation loop is reduced and the fluctuation is small, thus optimizing the heating effect of the indoor unit.

[0050] The air conditioning system of the present invention can be either a single-unit system or a multi-unit air conditioning system. In this embodiment, the number of indoor units 12 is 1, which is just a general term. The number of indoor units 12 can be 1 or more, which does not affect the operation of the system and can achieve uninterrupted continuous heating of the indoor units.

[0051] Appendix Figure 1 In this embodiment, the heat storage module 10 is located between the refrigerant side pipe shut-off valve 11, the refrigerant side pipe shut-off valve 13, and the compressor 1. In this embodiment, except for the indoor unit 12, all other parts can be used as the outdoor unit of the air conditioning unit. The advantage of this is that the air conditioning unit has a compact structure and is easy to install. However, it also has the disadvantage of requiring a relatively large outdoor unit size.

[0052] Regarding the appendixFigure 1 To address the drawback of the outdoor unit requiring a large size, the heat storage module 10 can be positioned after the refrigerant side pipe shut-off valve 11 and the refrigerant side pipe shut-off valve 13, placed side-by-side with the indoor unit 12. It can then be connected via the defrost shut-off valve 16 to form a defrost circulation loop. See Appendix for details. Figure 2 .

[0053] Appendix Figure 2 The medium-heat bypass defrosting branch consists of a defrosting control valve 2, a condenser defrosting inlet pipe 4, a condenser 6, a condenser defrosting outlet pipe 14, a defrosting throttling device 9, a defrosting pipe shut-off valve 16, a heat storage modular defrosting inlet pipe 106, a heat storage modular defrosting outlet pipe 103, and related connecting pipes. When the main circulation loop is in heating mode and the system detects the need for defrosting, the control logic controls the defrosting control valve 2 to open. The high-temperature refrigerant discharged from the compressor outlet after the compressor 1 performs work is branched off and flows to the defrosting control valve 2. After passing through the defrosting control valve 2, it flows into the condenser 6 through the defrosting inlet pipe 4. The condenser 6 releases heat and defrosts the frost layer on the fin surface. The refrigerant after releasing heat then enters the heat storage module through the defrosting outlet pipe 14, the defrosting throttling device 9, the defrosting pipe shut-off valve 16, and the heat storage module defrosting inlet pipe 106. It absorbs the heat stored by the heat storage medium 104 in the heat storage module. After absorbing heat, the refrigerant completes the conversion from liquid to gas. The gaseous refrigerant then flows into the main circulation loop through the heat storage module defrosting outlet pipe 103, and then returns to the suction end of the compressor 1 after passing through the four-way valve 3, completing the defrosting cycle. When the main refrigeration cycle is running in cooling mode or heating mode and the system logic determines that defrosting is not required, the control logic disconnects defrosting control valve 2, preventing refrigerant from passing through defrosting control valve 2, and this branch is in a disconnected and non-working state.

[0054] This thermal storage module branch can be installed indoors as an indoor unit, or it can be installed outdoors as a separate module together with the outdoor unit. This reduces the structural size of the outdoor unit and improves installation flexibility.

[0055] Example 2

[0056] In a preferred embodiment 2 of the present invention, an air conditioning unit control method is provided, which is applied to the air conditioning unit in embodiment 1 described above. Specifically, Figure 3 An optional flowchart of the method is shown, such as Figure 3 As shown, the method includes the following steps S302-S306:

[0057] S302: When the air conditioning unit is in heating mode, check whether the condenser needs to defrost;

[0058] S304: If the condenser requires defrosting, control the hot gas bypass defrosting branch to be open;

[0059] S306: Otherwise, continue in heating mode.

[0060] In the above embodiment, a kind of air conditioning unit with heat storage module and hot bypass defrost structure is provided, which can realize indoor heating while defrosting outdoor condenser simultaneously, and indoor heating and outdoor condenser defrosting coexist, four-way valve does not need to reverse, and the whole machine still runs heating cycle, so as to realize continuous heating of air conditioning unit and improve user comfort.

[0061] The control of the hot gas bypass defrost branch includes controlling the opening of the defrost control valve. After the control of the hot gas bypass defrost branch, it further includes detecting the frosting degree of the condenser, controlling the opening of the defrost throttling device according to the frosting degree, and the more serious the frosting degree, the larger the opening of the defrost throttling device. The opening and closing of the defrost control valve is controlled and judged by the unit logic, so as to control the opening and closing of the hot gas bypass defrost branch. At the same time, the defrost throttling device in the hot gas bypass defrost branch controls the amount of refrigerant flow by the unit logic, and cooperates with the whole machine operation control logic to control and adjust the refrigerant flow of the defrost throttling device according to the frosting degree of the condenser. When the frosting degree of the condenser is serious, the refrigerant flow of the defrost throttling device is large, and the defrosting capacity is strong. On the contrary, when the frosting degree of the condenser is not serious, the required defrosting capacity is small, and the refrigerant flow of the defrost throttling device is small. In this way, the refrigerant flow of the main refrigeration cycle loop is reduced with small fluctuation, and the indoor heating effect is optimized.

[0062] Before detecting whether the condenser needs to be defrosted, it further includes controlling the closing of the heat storage control valve to control the opening of the heat storage branch. The heat storage module shared by the heat storage branch and the hot gas bypass defrost branch is characterized in that the pipeline part is a two-in and two-out structure independent of each other. The heat storage module stores heat medium shared by the two circulating loops. The heat energy released by the refrigerant during the heating operation of the main refrigeration cycle loop is absorbed by the heat storage medium of the heat storage module, stored, and absorbed by the hot gas bypass defrost branch during operation. The heat energy is transferred between the heat storage branch and the hot gas bypass defrost branch through the heat storage medium of the heat storage module, which ensures the realizability and continuity of heat exchange. After the heat storage branch is opened, the stop condition of the heat storage branch can be set, such as detecting the temperature of the heat storage medium. When the temperature is high enough, it means that the heat storage capacity of the heat storage module reaches the upper limit and no longer needs to absorb heat. Then the heat storage branch can be controlled to stop running.

[0063] Embodiment 3

[0064] Based on the air conditioning unit control method provided in the above embodiment 2, in the preferred embodiment 3 of the present application, a storage medium containing computer executable instructions is further provided, which is used to execute the air conditioning unit control method as described above when executed by a computer processor.

[0065] In the above-mentioned embodiments, the air conditioning unit with the heat storage module and the hot bypass defrosting structure can realize simultaneous heating at the indoor side and simultaneous defrosting of the outdoor side condenser, and the four-way valve does not need to be reversed, so that the whole machine still runs in the heating cycle, thereby realizing continuous heating of the air conditioning unit and improving user comfort.

[0066] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0067] It is to be understood that the application is not limited to the precise details of design described above and shown in the drawings. Various modifications and changes can be made to what has been described and illustrated without departing from the scope of the application. The scope of the application should, therefore, be limited only by the appended claims.

Claims

1. An air conditioning unit, characterized in that, include: Compressor (1), four-way valve (3), evaporator (122), throttling device (8), condenser (6); A heat storage module (10) is connected in parallel with the evaporator (122); The compressor (1), the four-way valve (3), the evaporator (122), the throttling device (8) and the condenser (6) are connected in sequence to form the main circulation loop; The compressor (1), the four-way valve (3), the heat storage module (10), the throttling device (8) and the condenser (6) are connected in sequence to form a heat storage branch; The heat storage module (10) is also connected in sequence with the condenser (6), the compressor (1) and the four-way valve (3) to form a hot gas bypass defrosting branch; The heat storage module (10) includes a first pipeline and a second pipeline that are independently set up. The first pipeline is connected in series in the heat storage branch, and the second pipeline is connected in series in the hot gas bypass defrosting branch. One end of the second pipeline is connected to the exhaust port of the compressor (1), and the other end is connected to the four-way valve (3). The condenser (6) has a third pipeline and a fourth pipeline that are independently arranged. The third pipeline is connected in series in the main circulation loop, and the fourth pipeline is connected in series in the hot gas bypass defrosting branch. The condenser (6) includes a first arrangement area and a second arrangement area. The third pipeline is located in the first arrangement area, and the fourth pipeline is located in the second arrangement area. The first arrangement area and the second arrangement area are arranged alternately or alternately.

2. The air conditioning unit according to claim 1, characterized in that, The hot gas bypass defrosting branch also includes: The defrosting throttling device (9) is located on the pipeline between the second pipeline and the condenser (6) and is used to regulate the refrigerant flow rate of the hot gas bypass defrosting branch.

3. The air conditioning unit according to claim 1, characterized in that, The heat storage branch also includes: A heat storage throttling valve (102) is located on the pipeline between the first pipeline and the condenser (6) and is used to control the refrigerant flow rate of the heat storage branch.

4. The air conditioning unit according to claim 1, characterized in that, The hot gas bypass defrosting branch also includes: The defrosting control valve (2) is located on the pipeline between the fourth pipeline and the compressor (1) and is used to control the opening and closing of the hot gas bypass defrosting branch.

5. An air conditioning unit control method, applied to an air conditioning unit as described in any one of claims 1 to 4, characterized in that, The method includes: When the air conditioning unit is in heating mode, it is detected whether the condenser needs to defrost. If the condenser requires defrosting, the hot gas bypass defrosting branch is activated. Otherwise, continue in the heating mode.

6. The method according to claim 5, characterized in that, The control of the hot gas bypass defrosting branch connection includes: The defrosting control valve is opened.

7. The method according to claim 6, characterized in that, After the control hot gas bypass defrosting branch is turned on, the following is also included: Detect the degree of frost buildup on the condenser; The opening degree of the defrosting throttling device is controlled according to the degree of frost formation; wherein, the more severe the frost formation, the greater the opening degree of the defrosting throttling device.

8. The method according to claim 5, characterized in that, Before detecting whether the condenser needs defrosting, the method further includes: Control the closure of the heat storage control valve to control the conduction of the heat storage branch.

9. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the air conditioning unit control method as described in any one of claims 5 to 8.

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