Air conditioning unit

Abstract

The air conditioning unit comprises an indoor unit, the indoor unit is provided with an air inlet and an air outlet, and an air path is formed between the air inlet and the air outlet; the indoor unit is further provided with an air inlet valve, a bypass air valve and an indoor heat exchanger assembly, the air inlet valve is arranged at the air inlet, the indoor heat exchanger assembly and the bypass air valve are arranged on the air path side by side, in the air inlet direction, the projection of the bypass air valve coincides with the projection of the air inlet valve, and the projection of the indoor heat exchanger assembly coincides with the projection of the air inlet valve. The opening degree of the bypass air valve and the opening degree of the air inlet air valve can be adjusted. The air conditioning unit can improve the adjusting precision of the air volume flowing through the indoor heat exchanger.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioning unit. Background Art

[0002] Constant temperature and humidity air conditioners are mostly used in places where the temperature and humidity accuracy requirements are particularly high, such as the electronics industry, instrumentation, precision machinery, bioengineering, food and beverage, medicine and health, etc. The temperature and humidity in these places will directly affect the quality and storage of the product.

[0003] A constant temperature and humidity air conditioner usually includes an indoor unit and an outdoor unit. The indoor unit is provided with an air inlet and an air outlet. Outdoor air enters the indoor unit through the air inlet, exchanges heat with the heat exchanger of the indoor unit, and then is delivered to the air-conditioned room through the air outlet. The air volume flowing through the heat exchanger will affect the temperature and humidity of the outlet air. In the relevant structure, the conventional practice is to set an air inlet valve with an adjustable opening size at the air inlet to adjust the total air volume entering the indoor unit. However, the above method has low accuracy in adjusting the air volume flowing through the heat exchanger. Utility Model Content

[0004] Based on this, it is necessary to provide an air conditioning unit that can improve the regulation accuracy of the air volume passing through the indoor heat exchanger.

[0005] An air conditioning unit includes an indoor unit, the indoor unit is provided with an air inlet and an air outlet, and an air path is formed between the air inlet and the air outlet; the indoor unit is also provided with an air inlet valve, a bypass air valve and an indoor heat exchanger assembly, the air inlet valve is arranged at the air inlet, the indoor heat exchanger assembly and the bypass air valve are arranged in parallel on the air path, and along the air inlet direction, the projection of the bypass air valve coincides with the projection of the air inlet valve, the projection of the indoor heat exchanger assembly coincides with the projection of the air inlet valve, and the opening sizes of the bypass air valve and the air inlet air valve can be adjusted.

[0006] In one of the embodiments, the air conditioning unit also includes a temperature and humidity sensor, which is arranged at the air outlet and is used to detect the actual temperature and actual humidity of the air outlet, and the bypass air valve is configured to adjust the opening size in response to the actual temperature and actual humidity measured by the temperature and humidity sensor.

[0007] In one embodiment, the indoor heat exchanger assembly and the bypass air valve are respectively perpendicular to the air inlet direction; the indoor heat exchanger assembly and the bypass air valve are arranged side by side along the direction perpendicular to the air inlet direction; or, the indoor heat exchanger assembly and the bypass air valve are staggered along the air inlet direction.

[0008] In one embodiment, the indoor unit is further provided with a blower and an air filter. The blower is arranged near the air outlet. Along the air inlet direction, the air filter is installed behind the air inlet valve and in front of the bypass air valve and the indoor heat exchanger assembly.

[0009] In one embodiment, the air conditioner unit further includes a compressor, a four-way valve, an outdoor heat exchanger, a first branch, a second branch, a first throttling element, and a second throttling element located on the outdoor side. The indoor heat exchanger assembly includes a first indoor heat exchanger and a second indoor heat exchanger. The four-way valve has ports D, E, S, and C. The outlet of the compressor is connected in parallel to the liquid inlet end of the second indoor heat exchanger and port E. One end of the first branch is connected to port S, and the other end is connected to the liquid inlet end of the first indoor heat exchanger. The outdoor heat exchanger and the first throttling element are connected in series on the first branch, and the outdoor heat exchanger is arranged closer to port S than the first throttling element. One end of the second branch is connected to the liquid outlet end of the second indoor heat exchanger, and the other end is connected between the first throttling element and the liquid inlet end of the first indoor heat exchanger. The second throttling element is arranged on the second branch. The liquid outlet end of the first indoor heat exchanger is connected to port D, and port C is connected to the inlet of the compressor.

[0010] In one embodiment, the second indoor heat exchanger and the first indoor heat exchanger are arranged along the air inlet direction, and the first indoor heat exchanger is arranged closer to the air inlet than the second indoor heat exchanger.

[0011] In one embodiment, when the air conditioner unit is in the cooling mode, port E is connected to port S, port D is connected to port C, the first throttling element is opened, and the second throttling element is closed. Moreover, the first throttling element is configured to adjust its own opening degree in response to the suction superheat degree of the compressor, and the bypass air valve is closed.

[0012] In one embodiment, when the air conditioner unit is in the heating mode, port E is connected to port D, port S is connected to port C, the second throttling element is closed, and the first throttling element is opened. Moreover, the first throttling element is configured to adjust its own opening degree in response to the suction superheat degree of the compressor, and the bypass air valve is closed.

[0013] In one embodiment, when the air conditioner unit is in the cooling and heat recovery working mode, port E is connected to port S, port D is connected to port C, the second throttling element is opened, and the first throttling element is opened. Moreover, when the actual temperature at the air outlet is greater than the first target temperature value, the opening degree of the second throttling element increases; when the actual temperature at the air outlet is less than the first target temperature value, the opening degree of the second throttling element decreases. The first throttling element is configured to adjust its own opening degree in response to the suction superheat degree of the compressor.

[0014] In one embodiment, when the actual temperature at the air outlet is less than or equal to the second target temperature value, the air-conditioning unit switches to the low-temperature refrigeration mode. Port E is connected to Port S, Port D is connected to Port C, the second throttling element is opened, and the opening degree of the first throttling element is reduced to the first small opening degree value.

[0015] Compared with the prior art, for the air-conditioning unit provided in the present application, the air entering the indoor unit from the air inlet is divided into two parts. One part flows into the air outlet after passing through the bypass air valve, and the other part flows into the air outlet after passing through the indoor heat exchanger assembly. Moreover, by adjusting the opening degree of the inlet air valve, the total air intake entering the indoor unit can be adjusted, so that the air volume flowing through the indoor heat exchanger assembly can be initially adjusted. When the total air intake entering the indoor unit is the same, by adjusting the opening degree of the bypass air valve, the air volume flowing through the indoor heat exchanger assembly can be further adjusted. In this way, through two-stage air volume adjustment, the accuracy of the air volume adjustment flowing through the indoor heat exchanger assembly can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the air-conditioning unit provided in the present application;

[0018] Figure 2 It is a schematic diagram of the air-conditioning unit provided in the present application in the refrigeration mode;

[0019] Figure 3 It is a schematic diagram of the air-conditioning unit provided in the present application in the heating mode;

[0020] Figure 4 It is a schematic diagram of the air-conditioning unit provided in the present application in the refrigeration and heat recovery working mode;

[0021] Figure 5 It is a schematic diagram of the air-conditioning unit provided in the present application in the low-temperature refrigeration mode.

[0022] Reference Numerals: 100, air conditioner unit; 101, indoor unit; 101a, air inlet; 101b, air outlet; 10, inlet air damper; 20, bypass air damper; 30, indoor heat exchanger assembly; 31, first indoor heat exchanger; 32, second indoor heat exchanger; 321, second branch; 322, second throttling element; 40, temperature and humidity sensor; 50, air blower; 102, outdoor side; 60, compressor; 61, outlet; 62, inlet; 70, four-way valve; 80, outdoor heat exchanger; 81, first branch; 82, first throttling element; 83, refrigerant filter; 84, liquid receiver; 91, gas-liquid separator; 92, oil separator; 921, liquid inlet; 922, liquid outlet; 923, oil outlet; 93, capillary tube; 94, stop valve. Detailed Embodiment

[0023] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is lower than that of the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0028] Please refer to Figure 1 , this application provides an air conditioner unit 100, which includes an indoor unit 101. The indoor unit 101 is provided with an air inlet 101a and an air outlet 101b, and an air path is formed between the air inlet 101a and the air outlet 101b. The indoor unit 101 is further provided with an inlet air valve 10, a bypass air valve 20 and an indoor heat exchanger assembly 30. The inlet air valve 10 is arranged at the air inlet 101a. The indoor heat exchanger assembly 30 and the bypass air valve 20 are arranged in parallel on the air path. And, along the air inlet direction, the projection of the bypass air valve 20 coincides with the projection of the inlet air valve 10, the projection of the indoor heat exchanger assembly 30 coincides with the projection of the inlet air valve 10, and the opening degrees of both the bypass air valve 20 and the inlet air valve 10 can be adjusted.

[0029] It should be noted that the direction in which air flows from the air inlet 101a along the air path to the air outlet 101b is the air inlet direction. The air entering the indoor unit 101 from the air inlet 101a will be divided into two parts. One part flows into the air outlet 101b after passing through the bypass air valve 20, and the other part flows into the air outlet 101b after flowing through the indoor heat exchanger assembly 30. And, by adjusting the opening degree of the inlet air valve 10, the total air inlet volume entering the indoor unit 101 can be adjusted, so that the air volume flowing through the indoor heat exchanger assembly 30 can be initially adjusted. When the total air inlet volume entering the indoor unit 101 is the same, by adjusting the opening degree of the bypass air valve 20, the air volume flowing through the indoor heat exchanger assembly 30 can be further adjusted. In this way, through two-stage air volume adjustment, the accuracy of adjusting the air volume flowing through the indoor heat exchanger assembly 30 can be improved.

[0030] The air conditioner unit 100 further includes a temperature and humidity sensor 40, which is disposed at the air outlet 101b and is used to detect the actual temperature and actual humidity of the air outlet 101b. Moreover, the bypass air valve 20 is configured to adjust the opening degree in response to the actual temperature and actual humidity measured by the temperature and humidity sensor 40.

[0031] The inlet air valve 10 is configured to adjust the opening degree in response to the actual temperature and actual humidity measured by the temperature and humidity sensor 40, or alternatively, the opening degree of the inlet air valve 10 can also be manually adjusted.

[0032] The indoor heat exchanger assembly 30 and the bypass air valve 20 are respectively perpendicular to the inlet air direction. In this way, the windward areas of the indoor heat exchanger assembly 30 and the bypass air valve 20 are maximized as much as possible. Of course, the indoor heat exchanger assembly 30 and the bypass air valve 20 can also be arranged obliquely with respect to the inlet air direction.

[0033] Exemplarily, in one embodiment, the indoor heat exchanger assembly 30 and the bypass air valve 20 are respectively perpendicular to the inlet air direction, and the indoor heat exchanger assembly 30 and the bypass air valve 20 are arranged side by side along a direction perpendicular to the inlet air direction.

[0034] In another embodiment, the indoor heat exchanger assembly 30 and the bypass air valve 20 are respectively perpendicular to the inlet air direction, and the indoor heat exchanger assembly 30 and the bypass air valve 20 are arranged offset along the inlet air direction.

[0035] The indoor unit 101 is further provided with a blower 50 and an air filter (not shown in the figure). The blower 50 is disposed close to the air outlet 101b. Along the inlet air direction, the air filter is installed behind the inlet air valve 10 and in front of the bypass air valve 20 and the indoor heat exchanger assembly 30. The blower 50 is used to provide suction force to send air with the required temperature and humidity into the air-conditioned room through the air outlet 101b, and the air filter is used to filter the air flowing into the indoor unit towards the bypass air valve 20 and the indoor heat exchanger assembly 30.

[0036] Optionally, the air filter can be configured for single-stage filtration, or configured to perform multi-stage filtration on the air along the inlet air direction.

[0037] Please continue to refer to Figure 1, the air conditioner unit 100 further includes a compressor 60, a four-way valve 70, an outdoor heat exchanger 80, a first branch 81, a second branch 321, a first throttling element 82, and a second throttling element 322 located on the outdoor side 102. The four-way valve has a D port, an E port, an S port, and a C port; the outlet 61 of the compressor is connected in parallel to the liquid inlet end of the second indoor heat exchanger 32 and the E port. One end of the first branch 81 is connected to the S port, and the other end is connected to the liquid inlet end of the first indoor heat exchanger 31. The outdoor heat exchanger 80 and the first throttling element 82 are connected in series on the first branch 81, and the outdoor heat exchanger 80 is arranged closer to the S port than the first throttling element 82. One end of the second branch 321 is connected to the liquid outlet end of the second indoor heat exchanger 32, and the other end is connected between the first throttling element 82 and the liquid inlet end of the first indoor heat exchanger 31. The second throttling element 322 is arranged on the second branch 321. The liquid outlet end of the first indoor heat exchanger 31 is connected to the D port. The C port is connected to the inlet 62 of the compressor 60. Among them, a stop valve 94 is respectively arranged between the outlet 61 of the compressor 60 and the liquid inlet end of the second indoor heat exchanger 32, between the first throttling element 82 and the liquid inlet end of the first indoor heat exchanger 31, and between the liquid outlet end of the first indoor heat exchanger 31 and the D port.

[0038] In this way, the second indoor heat exchanger 32 and the outdoor heat exchanger 80 are connected in parallel to the outlet 61 of the compressor 60. Moreover, the second indoor heat exchanger 32 and the outdoor heat exchanger 80 can respectively be used as condensers. Thus, the second indoor heat exchanger 32 can recover the condensation heat and use it to heat the air on the air path to reduce the energy consumption of the unit. The first indoor heat exchanger 31 can be used as an evaporator to cool and dehumidify the air on the air path.

[0039] Among them, the second indoor heat exchanger 32 and the first indoor heat exchanger 31 are arranged along the air inlet direction, and the first indoor heat exchanger 31 is arranged closer to the air inlet 101a than the second indoor heat exchanger 32. In this way, when the first indoor heat exchanger 31 is used as an evaporator and the second indoor heat exchanger 32 is used as a condenser, the air entering the indoor unit 101 from the air inlet 101a first passes through the first indoor heat exchanger 31 for cooling and dehumidification, and then is heated by the second indoor heat exchanger 32.

[0040] A refrigerant filter 83 and a liquid receiver 84 are further arranged on the first branch 81. Among them, the refrigerant filter 83 is connected in series between the outdoor heat exchanger 80 and the first throttling element 82 and is used to filter impurities in the refrigerant flowing through the first branch 81. The liquid receiver 84 is connected in series between the first throttling element 82 and the stop valve 94 located on the first branch 81.

[0041] The air conditioner unit 100 further includes a gas-liquid separator 91, an oil separator 92, and a capillary tube 93 located on the outdoor side. The gas-liquid separator 91 is connected in series between port C and the inlet 62 of the compressor 60, and is used for gas-liquid separation of the refrigerant entering the inlet 62 of the compressor 60. The oil separator 92 has a liquid inlet 921, a liquid outlet 922, and an oil outlet 923. The liquid inlet 921 is connected to the outlet 61 of the compressor 60, the liquid outlet 922 is connected to port E, and the oil outlet 923 is connected between the inlet 62 of the compressor 60 and port C through the capillary tube 93. The oil separator 92 separates the lubricating oil in the high-pressure steam discharged from the compressor 60, and the separated lubricating oil flows back from the oil outlet 923 to the inlet 62 of the compressor 60 through the capillary tube 93.

[0042] The following introduces several working modes of the air conditioner unit 100

[0043] Cooling mode

[0044] As Figure 1 and Figure 2 shown, when the air conditioner unit 100 is in the cooling mode, port E is connected to port S, port D is connected to port C, the first throttling element 82 is opened, and the second throttling element 322 is closed; and, the first throttling element 82 is configured to adjust its own opening degree in response to the suction superheat degree of the compressor 60, and the bypass air valve 20 is closed.

[0045] It can be understood that the flow direction of the refrigerant is: outlet 61 of the compressor 60 - oil separator 92 - port E - port S - outdoor heat exchanger 80 - refrigerant filter 83 - first throttling element 82 - liquid receiver 84 - first indoor heat exchanger 31 - port D - port C - gas-liquid separator 91 - inlet 62 of the compressor 60. At this time, the outdoor heat exchanger 80 serves as a condenser, and the first indoor heat exchanger 31 serves as an evaporator.

[0046] Heating mode

[0047] As Figure 1 and Figure 3 shown, when the air conditioner unit 100 is in the heating mode, port E is connected to port D, port S is connected to port C, the second throttling element 322 is closed, and the first throttling element 82 is opened; and, the first throttling element 82 is configured to adjust its own opening degree in response to the suction superheat degree of the compressor 60, and the bypass air valve 20 is closed.

[0048] It can be understood that the flow direction of the refrigerant is: outlet 61 of the compressor 60 - oil separator 92 - port E - port D - first indoor heat exchanger 31 - liquid receiver 84 - first throttling element 82 - refrigerant filter 83 - outdoor heat exchanger 80 - port S - port C - gas-liquid separator 91 - inlet 62 of the compressor 60. At this time, the outdoor heat exchanger 80 serves as an evaporator, and the first indoor heat exchanger 31 serves as a condenser.

[0049] Refrigeration and heat recovery mode

[0050] When the air conditioner unit 100 is in the refrigeration and heat recovery working mode, port E is connected to port S, port D is connected to port C, the second throttle element 322 is opened, and the first throttle element 82 is opened; and when the actual temperature of the air outlet 101b is greater than the first target temperature value, the opening degree of the second throttle element 322 increases, and when the actual temperature of the air outlet 101b is less than the first target temperature value, the opening degree of the second throttle element 322 decreases; the first throttle element 82 is configured to adjust its own opening degree in response to the suction superheat of the compressor 60.

[0051] It can be understood that the flow direction of the refrigerant is:

[0052] As Figure 1 and Figure 4 shown, the outlet 61 of the compressor 60 - the oil separator 92, the refrigerant flowing out of the oil separator 92 is divided into two flow paths, one of which is: port E - port S - the outdoor heat exchanger 80 - the refrigerant filter 83 - the first throttle element 82 - the accumulator 84; the other flow path is the second indoor heat exchanger 32 - the second throttle element 322; the refrigerant flowing out of the second throttle element 322 enters the first branch 81 and flows into the first indoor heat exchanger 31 - port D - port C - the gas-liquid separator 91 - the inlet 62 of the compressor 60 together with the refrigerant flowing out of the accumulator 84.

[0053] In this way, both the second indoor heat exchanger 32 and the outdoor heat exchanger 80 are used as condensers. The condensation heat recovered by the second indoor heat exchanger 32 heats the indoor air. And by adjusting the opening degree of the second throttle element 322, the refrigerant flow rate through the second indoor heat exchanger 32 can be adjusted, so as to realize the reheat adjustment. The first indoor heat exchanger 31 is used as an evaporator. As the unit operates, by adjusting the opening degree of the first throttle element 82, the refrigerant flow rate flowing into the first indoor heat exchanger 31 (evaporator) can be adjusted, so that the suction superheat of the compressor 60 is maintained within a suitable range to ensure that the compressor 60 can maintain normal and safe operation.

[0054] Furthermore, when the actual humidity at the air outlet 101b is greater than the target humidity, the opening degree of the bypass air valve 20 increases; when the actual humidity at the air outlet 101b is less than the target humidity, the opening degree of the bypass air valve 20 decreases. It can be understood that, with the total indoor air intake remaining unchanged, by increasing the opening degree of the bypass air valve 20, less air blows towards the first indoor heat exchanger 31. In this way, the dew point temperature of the first indoor heat exchanger 31 can be reduced, and water vapor in the indoor air condenses and precipitates on the surface of the first indoor heat exchanger 31 (evaporator), thereby achieving the purpose of reducing the indoor humidity. Similarly, with the total indoor air intake remaining unchanged, by decreasing the opening degree of the bypass air valve 20, more air blows towards the first indoor heat exchanger 31. In this way, the dew point temperature of the first indoor heat exchanger 31 can be increased, and the condensation and precipitation of water vapor in the indoor air on the evaporator surface are reduced.

[0055] Low-temperature refrigeration mode

[0056] As Figure 1 and Figure 5 shown, when the actual temperature at the air outlet 101b is less than or equal to the second target temperature value, the air conditioner unit 100 switches to the low-temperature refrigeration mode, port E is connected to port S, port D is connected to port C, the second throttling element 322 is opened, and the opening degree of the first throttling element 82 is reduced to the first small opening degree value.

[0057] It can be understood that the refrigerant flow direction is: the outlet 61 of the compressor 60 - the oil separator 92 - the second indoor heat exchanger 32 - the second throttling element 322 - the first indoor heat exchanger 31 - port D - port C - the gas-liquid separator 91 - the inlet 62 of the compressor 60. Additionally, since the opening degree of the first throttling element 82 is reduced to the first small opening degree value, very little refrigerant can flow from the outlet 61 of the compressor 60 - the oil separator 92 - port E - port S - the outdoor heat exchanger 80 - the first throttling element 82 - the liquid receiver 84. That is, the second indoor heat exchanger 32 serves as a condenser, and the first indoor heat exchanger 31 serves as an evaporator.

[0058] In this way, when the actual temperature at the air outlet 101b is less than or equal to the second target temperature value, since the air temperature decreases, the condensation temperature also decreases. When the second indoor heat exchanger 32 and the outdoor heat exchanger 80 both operate as condensers simultaneously, the load on the compressor 60 increases. At this time, by reducing the opening degree of the first throttling element 82, most of the refrigerant flows through the second indoor heat exchanger 32, and only a very small amount of refrigerant flows through the outdoor heat exchanger 80, thereby reducing the load on the compressor 60. And it can avoid the accumulation of refrigerant between the outlet 61 of the compressor 60 and the first throttling element 82 caused by the first throttling element 82 being fully closed.

[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0060] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. An air conditioning unit, characterized in that: The air conditioning unit comprises an indoor unit (101), the indoor unit (101) is provided with an air inlet (101a) and an air outlet (101b), and an air path is formed between the air inlet (101a) and the air outlet (101b); The indoor unit (101) is also provided with an air inlet valve (10), a bypass air valve (20) and an indoor heat exchanger assembly (30); the air inlet valve (10) is arranged at the air inlet (101a); the indoor heat exchanger assembly (30) and the bypass air valve (20) are arranged in parallel on the air path; and along the air inlet direction, the projection of the bypass air valve (20) coincides with the projection of the air inlet valve (10); the projection of the indoor heat exchanger assembly (30) coincides with the projection of the air inlet valve (10); and the opening sizes of the bypass air valve (20) and the air inlet valve (10) are adjustable.

2. The air conditioning unit according to claim 1, characterized in that: The air conditioning unit further comprises a temperature and humidity sensor (40), wherein the temperature and humidity sensor (40) is disposed at the air outlet (101b) and is used to detect the actual temperature and actual humidity of the air outlet (101b), and the bypass air valve (20) is configured to be able to adjust the opening size in response to the actual temperature and actual humidity measured by the temperature and humidity sensor (40).

3. The air conditioning unit according to claim 1, characterized in that: The indoor heat exchanger assembly (30) and the bypass air valve (20) are respectively perpendicular to the air inlet direction; Along a direction perpendicular to the air inlet direction, the indoor heat exchanger assembly (30) and the bypass air valve (20) are arranged side by side; or, the indoor heat exchanger assembly (30) and the bypass air valve (20) are arranged staggered along the air inlet direction.

4. The air conditioning unit according to any one of claims 1 to 3, characterized in that: The indoor unit (101) is also provided with an air supply fan (50) and an air filter. The air supply fan (50) is arranged close to the air outlet (101b). Along the air inlet direction, the air filter is installed behind the air inlet valve (10) and is located in front of the bypass valve (20) and the indoor heat exchanger assembly (30).

5. The air conditioning unit according to any one of claims 1 to 3, characterized in that: The air conditioning unit further comprises a compressor (60) located on the outdoor side (102), a four-way valve (70), an outdoor heat exchanger (80), a first branch (81), a second branch (321), a first throttling element (82) and a second throttling element (322); the indoor heat exchanger assembly (30) comprises a first indoor heat exchanger (31) and a second indoor heat exchanger (32); the four-way valve has a D port, an E port, an S port and a C port; The outlet (61) of the compressor is connected in parallel to the E port and the liquid inlet end of the second indoor heat exchanger (32); one end of the first branch (81) is connected to the S port, and the other end is connected to the liquid inlet end of the first indoor heat exchanger (31); the outdoor heat exchanger (80) and the first throttling element (82) are connected in series on the first branch (81), and the outdoor heat exchanger (80) is arranged closer to the S port than the first throttling element (82); one end of the second branch (321) is connected to the liquid outlet end of the second indoor heat exchanger (32), and the other end is connected between the first throttling element (82) and the liquid inlet end of the first indoor heat exchanger (31); and the second throttling element (322) is arranged on the second branch (321); the liquid outlet end of the first indoor heat exchanger (31) is connected to the D port, and the C port is connected to the inlet (62) of the compressor (60).

6. The air conditioning unit according to claim 5, characterized in that: The second indoor heat exchanger (32) and the first indoor heat exchanger (31) are arranged along the air inlet direction, and the first indoor heat exchanger (31) is arranged closer to the air inlet (101a) than the second indoor heat exchanger (32).

7. The air conditioning unit according to claim 5, characterized in that: When the air conditioning unit is in cooling mode, the E port is connected to the S port, the D port is connected to the C port, the first throttling element (82) is opened, and the second throttling element (322) is closed; Furthermore, the first throttling element (82) is configured to adjust its opening degree in response to the suction air superheat of the compressor (60), and the bypass air valve (20) is closed.

8. The air conditioning unit according to claim 5, characterized in that: When the air conditioning unit is in heating mode, the E port is connected to the D port, the S port is connected to the C port, the second throttling element (322) is closed, and the first throttling element (82) is opened; Furthermore, the first throttling element (82) is configured to adjust its opening degree in response to the suction air superheat of the compressor (60), and the bypass air valve (20) is closed.

9. The air conditioning unit according to claim 5, characterized in that: When the air conditioning unit is in a cooling and heat recovery working mode, the E port is connected to the S port, the D port is connected to the C port, the second throttling element (322) is opened, and the first throttling element (82) is opened; Furthermore, when the actual temperature of the air outlet (101b) is greater than the first target temperature value, the opening of the second throttling element (322) increases; when the actual temperature of the air outlet (101b) is less than the first target temperature value, the opening of the second throttling element (322) decreases; the first throttling element (82) is configured to adjust its own opening size in response to the suction superheat of the compressor (60).

10. The air conditioning unit according to claim 5, characterized in that: When the actual temperature of the air outlet (101b) is less than or equal to the second target temperature value, the air conditioning unit switches to the low-temperature cooling mode, the E port is connected to the S port, the D port is connected to the C port, the second throttling element (322) is opened, and the opening of the first throttling element (82) is reduced to a first small opening value.

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