Throttling structure and air conditioning unit

Abstract

The application discloses a throttling structure and an air conditioning unit. The throttling structure comprises a main cavity and at least one auxiliary throttling cavity independently arranged in the main cavity. The outlet of the main cavity is connected with a main throttling orifice plate. The auxiliary throttling cavity is provided with a liquid inlet communicating with the main cavity. The liquid outlet of the auxiliary throttling cavity is connected with an auxiliary throttling orifice plate. The flow area of the liquid inlet is greater than the flow area of the auxiliary throttling orifice plate. The auxiliary throttling cavity is used in at least one operating condition. The liquid level height of the main cavity in the operating condition is higher than the liquid inlet of the corresponding auxiliary throttling cavity. The flow area of the auxiliary throttling orifice plate used in each operating condition is the set flow area of the operating condition minus the flow area of the main throttling orifice plate. According to the application, different combinations of throttling orifice plates are automatically switched according to the liquid level height of the main cavity, the throttling requirements of different operating conditions of the unit are matched, the unit continuously operates at the optimal performance, and the operating efficiency of the unit is improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a throttling structure and air conditioning unit that can adapt to various operating conditions. Background Technology

[0002] Existing air conditioning units commonly use orifice plates as throttling elements, which have significant advantages such as low cost, simple processing and stable reliability. However, since orifice plates have fixed orifice diameters, once the unit is manufactured, the orifice diameter cannot be adjusted according to the unit's operating conditions, making it unable to adapt to changes in the unit's operating conditions.

[0003] like Figure 1 As shown, taking a centrifugal heat pump unit as an example, a flash evaporator 3 is installed between the condenser 4 and the evaporator 2. The outlet of the condenser 4 is connected to a primary main throttling orifice plate 5, and the outlet of the flash evaporator 3 is connected to a secondary main throttling orifice plate 6. The outlet of the flash evaporator 3 is connected to the compressor 1 through a gas supply pipe 7. In summer, the unit needs to operate in cooling mode, and in winter, the unit needs to operate in heating mode. Due to the large difference between heating and cooling modes, the orifice diameter of the throttling orifice plate required for refrigerant circulation differs significantly. This two-stage throttling orifice plate scheme cannot accommodate both cooling and heating modes of the unit, and cannot adjust the orifice diameter according to the switching of operating modes, resulting in the unit not being able to fully utilize its operating performance and affecting the unit's operating efficiency.

[0004] Therefore, how to design throttling structures and air conditioning units that can adapt to various operating conditions is a technical problem that the industry urgently needs to solve. Summary of the Invention

[0005] To address the shortcomings of existing throttling schemes that cannot adapt to different operating conditions of the unit, resulting in low unit operating efficiency, this invention proposes a throttling structure and air conditioning unit that automatically switches between different combinations of throttling orifice plates based on the liquid level in the main chamber. This achieves the throttling requirements to match different operating conditions of the unit, enabling the unit to operate continuously at optimal performance and improving unit operating efficiency.

[0006] The technical solution adopted in this invention is to design a throttling structure, including: a main cavity and at least one auxiliary throttling cavity independently disposed inside the main cavity, the outlet of the main cavity is connected to a main throttling orifice plate, the auxiliary throttling cavity is provided with an inlet communicating with the main cavity, and the outlet of the auxiliary throttling cavity is connected to an auxiliary throttling orifice plate.

[0007] Furthermore, the flow area of ​​the liquid inlet is larger than that of the auxiliary throttling orifice plate.

[0008] Furthermore, the main throttling orifice plate and the auxiliary throttling orifice plate are connected in parallel on the liquid outlet pipe.

[0009] Further, the auxiliary throttling cavity is used in at least one operating condition, and the liquid level height of the main cavity in the operating condition is higher than the liquid inlet of the corresponding auxiliary throttling cavity.

[0010] Further, the flow area of the auxiliary throttling orifice plate used in each operating condition is the set flow area of the operating condition minus the flow area of the main throttling orifice plate.

[0011] In some embodiments, the liquid outlet of the auxiliary throttling cavity is connected with multiple auxiliary throttling orifice plates arranged in parallel, and each auxiliary throttling orifice plate is configured with a control valve for switching the on-off state thereof.

[0012] In some embodiments, the inner part of the main cavity is distributed with multiple auxiliary throttling cavities, and the liquid inlets of the auxiliary throttling cavities are at different heights.

[0013] In some embodiments, the throttling structure is arranged in a heat exchanger and / or a flash evaporator.

[0014] The application further provides an air conditioning unit, which comprises a compressor, a condenser and an evaporator, and the condenser is provided with the above throttling structure.

[0015] In some embodiments, the air conditioning unit further comprises a flash evaporator provided with the above throttling structure, the throttling structure of the condenser is connected with the flash evaporator through a first liquid outlet pipeline, and the throttling structure of the flash evaporator is connected with the evaporator through a second liquid outlet pipeline.

[0016] Further, the condenser and the evaporator are both connected with user-side equipment, and the circulation direction of the refrigerant among the compressor, the condenser and the evaporator is the same in different operating conditions.

[0017] Further, the air conditioning unit has a refrigeration operating condition and a heating operating condition, the auxiliary throttling cavity is used in the refrigeration operating condition, the liquid level height of the main cavity in the refrigeration operating condition is higher than the liquid inlet of the auxiliary throttling cavity, and the liquid level height of the main cavity in the heating operating condition is lower than the liquid inlet of the auxiliary throttling cavity.

[0018] In some embodiments, the air conditioning unit is a heat pump unit.

[0019] Compared with the prior art, the application sets an auxiliary throttling cavity in the inner part of the main cavity, the main cavity and the auxiliary throttling cavity are respectively connected with throttling orifice plates, according to the different liquid level heights of the main cavity in different operating conditions, the refrigerant can enter the corresponding auxiliary throttling cavity from the liquid inlet, so as to automatically switch different throttling orifice plate aperture combinations and achieve different throttling effects, thereby matching the throttling requirements of the unit in different operating conditions, fully exerting the operating performance of the unit and improving the operating efficiency of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be described in detail below in conjunction with embodiments and drawings, in which:

[0021] Figure 1 is a connection diagram of a prior art air conditioning unit;

[0022] Figure 2 is a connection diagram of the throttling structure of the present application;

[0023] Figure 3 is a liquid level diagram of the air conditioning unit of the present application in a heating operating condition;

[0024] Figure 4 is a liquid level diagram of the air conditioning unit of the present application in a refrigerating operating condition. DETAILED DESCRIPTION

[0025] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present patent and do not limit the present patent.

[0026] As shown in Figures 2 to 4 The throttling structure of the present application is applicable to devices participating in refrigerant circulation, including but not limited to heat exchangers or flash evaporators. The heat exchanger with the throttling structure is used as a condenser when installed in an air conditioning unit. The reason is that the liquid refrigerant flowing out of the condenser needs to pass through throttling before being sent to the evaporator.

[0027] The inventor has found through research that the liquid level height in the condenser 4 varies significantly under different operating conditions. For example, when the flow rate of the refrigerant circulation loop in which the condenser 4 is located is large and the pressure ratio is small, the liquid level in the condenser 4 is high, and the required throttling hole diameter is large. When the flow rate of the refrigerant circulation loop in which the condenser 4 is located is small and the pressure ratio is large, the liquid level in the condenser 4 is low, and the required throttling hole diameter is small. In some application scenarios, the condenser 4 is connected with a flash evaporator 3, the liquid refrigerant flowing out of the condenser 4 is sent to the flash evaporator 3 through primary throttling, the liquid refrigerant flowing out of the flash evaporator 3 is sent to the evaporator 2 through secondary throttling, the flash evaporator 3 and the condenser 4 are in the same refrigerant circulation loop, the liquid level change trend of the flash evaporator 3 is the same as that of the condenser 4, and the required throttling hole diameter also needs to be adaptively adjusted to match different operating conditions. Based on the above findings, the inventor designs and proposes a throttling structure that automatically switches the hole diameter combination of the throttling orifice plate according to the liquid level height. The throttling structure will be described in detail below.

[0028] As shown in Figure 2As shown, the throttling structure comprises a main cavity 100 and at least one auxiliary throttling cavity 110, the main cavity 100 is provided with an inlet and an outlet, the refrigerant enters the main cavity 100 from the inlet of the main cavity 100, the outlet of the main cavity 100 is connected with a main throttling orifice plate 200, the auxiliary throttling cavity 110 is independently arranged in the main cavity 100, the auxiliary throttling cavity 110 is provided with a liquid inlet 111 and a liquid outlet, the auxiliary throttling cavity 110 is only communicated with the main cavity 100 through the liquid inlet 111 of the auxiliary throttling cavity, the liquid outlet of the auxiliary throttling cavity is connected with an auxiliary throttling orifice plate 300, and the height of the liquid inlet 111 of the auxiliary throttling cavity is between the inlet and the outlet of the main cavity 100.

[0029] The liquid level height of the main cavity 100 may be higher than or lower than the liquid inlet 111 of the auxiliary throttling cavity under different working conditions. When the liquid level height of the main cavity 100 is lower than the liquid inlet 111 of the auxiliary throttling cavity, the auxiliary throttling cavity 110 is not used, and only the main cavity 100 participates in the throttling work; when the liquid level height of the main cavity 100 is higher than the liquid inlet 111 of the auxiliary throttling cavity, the auxiliary throttling cavity 110 is used, the liquid refrigerant enters the auxiliary throttling cavity 110 from the liquid inlet 111, and the main throttling orifice plate 200 and the auxiliary throttling orifice plate 300 both participate in the throttling work, which is equivalent to connecting the main throttling orifice plate 200 and the auxiliary throttling orifice plate 300 in parallel.

[0030] In order to ensure that the liquid refrigerant in the main cavity 100 can smoothly enter the auxiliary throttling cavity 110, the flow area of the liquid inlet 111 of the auxiliary throttling cavity is greater than the flow area of the auxiliary throttling orifice plate 300, so as to avoid throttling phenomenon when the liquid refrigerant enters the auxiliary throttling cavity 110, and optimize the throttling effect of the auxiliary throttling cavity 110.

[0031] In some embodiments, the main throttling orifice plate 200 and the auxiliary throttling orifice plate 300 are connected in parallel on the liquid outlet pipeline, the refrigerant flowing out of the main throttling orifice plate 200 and the auxiliary throttling orifice plate 300 converges in the liquid outlet pipeline and then is transported, and the refrigerant transported by the liquid outlet pipeline is mixed uniformly and stable. Of course, in actual application, the main throttling orifice plate 200 and the auxiliary throttling orifice plate 300 can also be respectively connected with the liquid outlet pipeline, and the present application does not specially limit this.

[0032] It should be noted that the liquid outlet of the auxiliary throttling cavity 110 can be connected with one auxiliary throttling orifice plate 300, or can be connected with multiple auxiliary throttling orifice plates 300 according to actual use needs, when the liquid outlet of the auxiliary throttling cavity 110 is connected with multiple auxiliary throttling orifice plates 300 arranged in parallel, each auxiliary throttling orifice plate 300 is provided with a control valve for switching the on-off state thereof, the number of the auxiliary throttling orifice plates 300 connected through the control valve is adjusted, and then different combinations of throttling orifice diameters are realized, and the flexibility of throttling adjustment is improved.

[0033] In addition, the inside of the main cavity 100 can be designed with one auxiliary throttling cavity 110, or multiple auxiliary throttling cavities 110 according to actual use needs. When the inside of the main cavity 100 is distributed with multiple auxiliary throttling cavities 110, the liquid inlet 111 of each auxiliary throttling cavity is different in height, and the liquid level height of the main cavity 100 changes under different operating conditions. By comparing the height of the liquid inlet 111 of the auxiliary throttling cavity, the auxiliary throttling cavity 110 participating in throttling work is switched automatically, different throttling effects are achieved, and the operating conditions are matched to improve the operating efficiency.

[0034] In order to realize accurate switching of the auxiliary throttling cavity 110, each auxiliary throttling cavity 110 is used in at least one operating condition, and the liquid level height of the main cavity 100 under the operating condition is higher than the liquid inlet 111 of the auxiliary throttling cavity corresponding to the operating condition, so that the auxiliary throttling cavity 110 can be used under the corresponding operating condition. In order to realize accurate switching of the throttling aperture, the set flow area of each operating condition is obtained in advance, and the set flow area can be obtained by experiment or other means. The flow area of the auxiliary throttling orifice plate 300 used in each operating condition is the set flow area of the operating condition minus the flow area of the main throttling orifice plate 200. It should be understood that the set flow area, the flow area of the auxiliary throttling orifice plate 300 and the flow area of the main throttling orifice plate 200 are for the same device. When the condenser 4 and the flash evaporator 3 exist in the unit, and the condenser 4 and the flash evaporator 3 are both provided with throttling structures, the flow area of the auxiliary throttling orifice plate 300 used in different operating conditions is calculated for the condenser 4 and the flash evaporator 3 respectively.

[0035] The application also provides an air conditioning unit, which comprises a compressor, a condenser and an evaporator. The condenser is provided with the above-mentioned throttling structure, and the air conditioning unit can be a heat pump unit, such as a centrifugal heat pump unit.

[0036] In some embodiments, the condenser and the evaporator are both connected to user-side equipment, and the refrigerant circulation direction between the compressor, the condenser and the evaporator is the same under different operating conditions, so that the throttling capacity can be adjusted by using the throttling structure under different operating conditions, and the operating performance of the unit can be fully utilized. More specifically, the air conditioning unit has a refrigeration condition and a heating condition, the auxiliary throttling cavity is used in the refrigeration condition, and the liquid level height of the main cavity under the refrigeration condition is higher than the liquid inlet of the auxiliary throttling cavity. The liquid level height of the main cavity under the heating condition is lower than the liquid inlet of the auxiliary throttling cavity.

[0037] As Figures 3 to 4As shown in still other embodiments, the condenser 4 and the evaporator 2 are connected with the flasher 3, the flasher 3 is provided with the throttling structure as described above, the throttling structure of the condenser 4 is a primary throttling structure, the throttling structure of the flasher 3 is a secondary throttling structure, the primary throttling structure is connected with the flasher 3 through the first liquid outlet pipeline, the secondary throttling structure is connected with the evaporator 2 through the second liquid outlet pipeline, and the gas outlet of the flasher 3 is connected with the air supplementing port of the compressor 1 through the air supplementing pipeline 7.

[0038] The inventor has found through deep research that the liquid level height of the condenser 4 and the flasher 3 is obviously different under the refrigeration working condition and the heating working condition, the refrigerant flow is large and the pressure ratio is small when the unit operates under the refrigeration working condition, the liquid level in the condenser 4 and the flasher 3 is high, the required throttling hole diameter is large, the refrigerant flow is small and the pressure ratio is large when the unit operates under the heating working condition, and the liquid level in the condenser 4 and the flasher 3 is low. That is, the auxiliary throttling cavities of the condenser 4 and the flasher 3 are not used under the heating working condition, and the auxiliary throttling cavities of the condenser 4 and the flasher 3 are used under the refrigeration working condition. Based on the above application, the inventor designs the liquid inlet design scheme of the auxiliary throttling cavity, which is described in detail below.

[0039] Figures 3 to 4 The specific application examples of the application are shown, the main cavity of the condenser 4 is provided with a primary auxiliary throttling cavity 8, the side wall of the primary auxiliary throttling cavity 8 is provided with a primary auxiliary liquid inlet 9, the main cavity of the condenser 4 is connected with a primary main throttling hole plate 5 at the bottom, the bottom of the primary auxiliary throttling cavity 8 is connected with a primary auxiliary throttling hole plate 12, the main cavity of the flasher 3 is provided with a secondary auxiliary throttling cavity 10, the side wall of the secondary auxiliary throttling cavity 10 is provided with a secondary auxiliary liquid inlet 11, the main cavity of the flasher 3 is connected with a secondary main throttling hole plate 6 at the bottom, and the bottom of the secondary auxiliary throttling cavity 10 is connected with a secondary auxiliary throttling hole plate 13.

[0040] As shown in the figure, Figure 3 When the air conditioning unit operates under the heating working condition, the liquid level height in the condenser 4 is lower than the primary auxiliary liquid inlet 9, the liquid refrigerant in the condenser 4 does not enter the primary auxiliary throttling cavity 8, the liquid refrigerant in the condenser 4 enters the flasher 3 through the primary main throttling hole plate 5, part of the refrigerant in the flasher 3 is flashed into gas, enters the compressor 1 through the air supplementing pipeline 7, the liquid level height in the flasher 3 is lower than the secondary auxiliary liquid inlet 11, the liquid refrigerant in the flasher 3 does not enter the secondary auxiliary throttling cavity 10, and the liquid refrigerant in the flasher 3 enters the evaporator 2 after throttling through the secondary main throttling hole plate 6. The hole diameter of the primary main throttling hole plate 5 and the secondary main throttling hole plate 6 is designed according to the best operating state of the unit under the heating working condition, and the refrigeration working condition does not need to be considered.

[0041] As shown in the figure, Figure 4As shown, when the air conditioning unit operates in the refrigeration condition, the liquid level height in the condenser 4 is higher than the first auxiliary liquid inlet 9, and the liquid refrigerant in the condenser 4 enters the first auxiliary throttling cavity 8 through the first auxiliary liquid inlet 9. At this time, the liquid refrigerant in the condenser 4 enters the flash evaporator 3 through the first main throttling orifice plate 5 and the first auxiliary throttling orifice plate 12 in parallel, part of the refrigerant in the flash evaporator 3 is flashed into gas, and is sent to the compressor 1 through the gas supplement pipe 7. The liquid level height in the flash evaporator 3 is higher than the second auxiliary liquid inlet 11, and the liquid refrigerant in the flash evaporator 3 enters the second auxiliary throttling cavity 10 through the second auxiliary liquid inlet 11. The liquid refrigerant in the flash evaporator 3 enters the evaporator 2 through the second main throttling orifice plate 6 and the second auxiliary throttling orifice plate 13 in parallel. The hole diameters of the first main throttling orifice plate 5 and the second main throttling orifice plate 6 are designed according to the optimal operating state of the unit in the heating condition. The flow area of the first auxiliary throttling orifice plate 12 is the set flow area of the throttling orifice plate required by the condenser in the refrigeration condition minus the flow area of the first main throttling orifice plate 5. The flow area of the second auxiliary throttling orifice plate 13 is the set flow area of the throttling orifice plate required by the flash evaporator in the refrigeration condition minus the flow area of the second main throttling orifice plate 6.

[0042] It should be understood that the flow area of the first auxiliary liquid inlet 9 is greater than the flow area of the first auxiliary throttling orifice plate 12, and the flow area of the second auxiliary liquid inlet 11 is greater than the flow area of the second auxiliary throttling orifice plate 13, so as to avoid throttling phenomenon when entering the auxiliary throttling cavity. The heights of the first auxiliary liquid inlet 9 and the second auxiliary liquid inlet 11 are related to the specifications of the condenser 4 and the flash evaporator 3, and the heating (cooling) capacity and water temperature of the unit. The heat exchanger in the heat pump unit usually adopts a shell and tube heat exchanger, and the specifications mentioned above refer to the diameter, length and other parameters of the shell. The design requirements for the height of the liquid inlet are that the first auxiliary liquid inlet 9 is higher than the main cavity liquid level height of the condenser 4 when the unit operates in the heating condition, the height of the first auxiliary liquid inlet 9 is lower than the main cavity liquid level height of the condenser 4 when the unit operates in the refrigeration condition, the second auxiliary liquid inlet 11 is higher than the main cavity liquid level height of the flash evaporator 3 when the unit operates in the heating condition, and the height of the second auxiliary liquid inlet 11 is lower than the main cavity liquid level height of the flash evaporator 3 when the unit operates in the refrigeration condition.

[0043] The present application automatically switches different combinations of throttling orifice plate hole diameters by setting auxiliary throttling cavities in the condenser 4 and the flash evaporator 3, according to the refrigerant flow difference between the refrigeration condition and the heating condition, and using the corresponding relationship between the liquid level height in the condenser 4 and the flash evaporator 3 and the height of the liquid inlet of the auxiliary throttling cavity, to achieve different throttling effects, thereby matching the throttling requirements of the heating condition and the refrigeration condition switching, fully developing the operating performance of the unit, making the unit continuously and reliably operate at the optimal performance, and improving the operating efficiency of the unit.

[0044] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0045] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale of the actual proportions used in the fabrication, assembly, and operation of the example embodiments. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail herein. However, the techniques, methods, and apparatus are to be considered as part of the description of the application, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Other examples of the example embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, and thus, once defined, do not need to be further discussed.

[0046] In the description of the present application, it should be noted that the positional words "inner", "outer" refer to the inner and outer relative to the contour of the components themselves, and "a plurality of" means two or more. In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0047] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. Throttling structure, characterized in that The throttling structure comprises: a main cavity and at least one auxiliary throttling cavity independently arranged inside the main cavity, an outlet of the main cavity is connected with a main throttling orifice plate, the auxiliary throttling cavity is provided with a liquid inlet communicating with the main cavity, and a liquid outlet of the auxiliary throttling cavity is connected with an auxiliary throttling orifice plate, and the main throttling orifice plate and the auxiliary throttling orifice plate are connected in parallel on a liquid outlet pipeline; when the liquid level height of the main cavity is lower than the liquid inlet of the auxiliary throttling cavity, the auxiliary throttling cavity is not used, and only the main cavity is used for throttling; when the liquid level height of the main cavity is higher than the liquid inlet of the auxiliary throttling cavity, the auxiliary throttling cavity is used, liquid refrigerant enters the auxiliary throttling cavity from the liquid inlet, and the main throttling orifice plate and the auxiliary throttling orifice plate are both used for throttling; the throttling structure is arranged in a heat exchanger and / or a flash evaporator.

2. The throttle structure according to claim 1, characterized by The flow area of the liquid inlet is greater than the flow area of the auxiliary throttling orifice plate.

3. The restriction structure of claim 1, wherein, The auxiliary throttling cavity is used in at least one operating condition, and the liquid level height of the main cavity in the operating condition is higher than the liquid inlet of the corresponding auxiliary throttling cavity.

4. The restriction structure of claim 3, wherein, The flow area of the auxiliary throttling orifice plate used in each operating condition is the set flow area of the operating condition minus the flow area of the main throttling orifice plate.

5. The restriction structure of claim 1, wherein, The liquid outlet of the auxiliary throttling cavity is connected with a plurality of auxiliary throttling orifice plates arranged in parallel, and each auxiliary throttling orifice plate is provided with a control valve for switching the on-off state thereof.

6. The restriction structure of claim 1, wherein, The main cavity is distributed with a plurality of auxiliary throttling cavities, and the liquid inlets of the auxiliary throttling cavities are different in height.

7. An air conditioning unit comprising: A compressor, a condenser and an evaporator, characterized in that the condenser is provided with the throttling structure according to any one of claims 1 to 6.

8. The air conditioning unit of claim 7, wherein, Further comprising: a flash evaporator provided with the throttling structure, the throttling structure of the condenser is connected with the flash evaporator through a first liquid outlet pipeline, and the throttling structure of the flash evaporator is connected with the evaporator through a second liquid outlet pipeline.

9. The air conditioning unit of claim 7, wherein, The condenser and the evaporator are both connected with user-side equipment, and the refrigerant circulation direction among the compressor, the condenser and the evaporator is the same in different operating conditions.

10. The air conditioning unit of claim 9, wherein, The air conditioning unit has a refrigeration condition and a heating condition, the auxiliary throttling cavity is used in the refrigeration condition, the liquid level height of the main cavity in the refrigeration condition is higher than the liquid inlet of the auxiliary throttling cavity, and the liquid level height of the main cavity in the heating condition is lower than the liquid inlet of the auxiliary throttling cavity.

11. The air conditioning unit of claim 7, wherein The air conditioning unit is a heat pump unit.

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