Outdoor unit, air conditioning system and control method of air conditioning system

Abstract

The invention discloses an outdoor unit, an air conditioning system and a control method of the air conditioning system.The outdoor unit is provided with N first heat exchanger sets connected in parallel and M compressor sets connected in parallel, the N first heat exchanger sets are connected with the M compressor sets in series, and each first heat exchanger set is provided with n first heat exchangers connected in parallel; the total capacity of the N first heat exchanger sets can be adjusted by adjusting the number of the first heat exchangers, communicating with the indoor units and the compressors, of the N first heat exchanger sets, and the powers of the different compressor sets are different. According to the scheme, the multi-split air conditioner comprises the first heat exchanger sets with the adjustable capacity and the compressor sets with the different powers, when the load rate of the indoor units running in the multi-split air conditioner is low, the total capacity of the N first heat exchanger sets can be adjusted, and / or the compressor sets with the powers meeting the requirements can be switched to work, and the working efficiency is improved. Therefore, the load rate of the indoor unit and the total capacity of the N first heat exchanger sets are matched with the total power of the compressor set, and the power consumption of the multi-split air conditioner is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to an outdoor unit, an air-conditioning system, and a control method for the air-conditioning system. Background Art

[0002] Multi-split air conditioner is a type of central air conditioner, which is an outdoor unit connected to two or more indoor units through piping. Multi-split air conditioner can automatically adjust the flow of refrigerant according to the change of indoor unit load, so as to achieve efficient operation and save energy. At the same time, it can also be flexibly designed and installed according to the different structures and decoration requirements of buildings.

[0003] When a multi-split air conditioner is a large-capacity outdoor unit matched with multiple indoor units, if the number of indoor units actually turned on by the user is relatively small, the outdoor unit will run at a low frequency according to the load. However, since the outdoor unit itself has a large capacity, the energy consumption of the selected compressor is also relatively high. Even if the compressor runs at a low frequency, the power consumption of the multi-split air conditioner is still very high.

[0004] Therefore, how to reduce the energy consumption of multi-split air conditioners has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0005] The present application proposes an outdoor unit to reduce the energy consumption of a multi-split air conditioner. The present application also proposes an air conditioning system and a control method of the air conditioning system.

[0006] In order to achieve the above object, the present application provides an outdoor unit, comprising N groups of first heat exchanger groups connected in parallel and M groups of compressor groups connected in parallel, wherein the N groups of the first heat exchanger groups and the M groups of the compressor groups are connected in series, wherein N≥2, M≥2, N and M are positive integers,

[0007] The first heat exchanger group has n first heat exchangers connected in parallel, each of the first heat exchangers is connected to the indoor unit through a first pipeline, and each of the first heat exchangers is connected to the compressor group through a second pipeline.

[0008] At least one of the first pipelines is provided with a first valve to adjust the number of the first heat exchangers in communication between the first heat exchanger group and the indoor unit, and / or at least one of the second pipelines is provided with a second valve to adjust the number of the first heat exchangers in communication between the first heat exchanger group and the compressor group, wherein n≥2, and n is a positive integer;

[0009] The compressor group has at least one compressor, the compressor is connected to the indoor unit through a third pipeline, and the compressor is connected to the first heat exchanger group through a fourth pipeline.

[0010] A third valve is provided on the third pipeline, and the third valve is used to adjust the power of the compressor unit communicated with the indoor unit, and / or, a fourth valve is provided on the fourth pipeline to adjust the number of compressors in the compressor unit communicated with the first heat exchanger group.

[0011] Preferably, in the above outdoor unit, the total power between different compressor units is different.

[0012] Preferably, in the above outdoor unit, the number of compressors provided in each compressor unit is the same, and the power of at least one compressor is different between different groups;

[0013] Or, the power of each compressor is the same, and the number of compressors provided in different compressor units is different.

[0014] Preferably, in the above outdoor unit, the first heat exchanger group further includes a second heat exchanger connected in series with the first heat exchanger.

[0015] Preferably, in the above outdoor unit, it further includes a second heat exchanger group, and at least one first heat exchanger group is connected in series with the second heat exchanger group,

[0016] Preferably, the second heat exchanger group has at least one second heat exchanger.

[0017] Preferably, in the above outdoor unit, when the number of second heat exchangers in the second heat exchanger group is multiple, the capacities of the multiple second heat exchangers are the same or different.

[0018] Preferably, in the above outdoor unit, the capacities of the n first heat exchangers in the first heat exchanger group are the same or different.

[0019] Preferably, in the above outdoor unit, a gas-liquid separator is further provided between the compressor unit and the first heat exchanger group.

[0020] An air-conditioning system includes an indoor unit and an outdoor unit, the outdoor unit is connected in series with the indoor unit, and the outdoor unit is the outdoor unit described in any of the above solutions.

[0021] A control method for an air-conditioning system is applied to the air-conditioning system as described in the above solution, and the method includes:

[0022] Obtain the load rate of the indoor unit;

[0023] When the load rate of the indoor unit is greater than or equal to a preset range, increase the number of the first heat exchangers connected to the indoor unit, and / or, increase the power of the compressor unit connected to the indoor unit;

[0024] When the load rate of the indoor unit is less than or equal to a preset range, reduce the number of the first heat exchangers connected to the indoor unit, and / or reduce the power of the compressor units connected to the indoor unit.

[0025] The outdoor unit provided by the embodiment of the present application includes N first heat exchanger groups connected in parallel and M compressor units connected in parallel. The N first heat exchanger groups are connected in series with the M compressor units. The capacities of different first heat exchanger groups are different. Each first heat exchanger group has n first heat exchangers connected in parallel. The total capacity of the N first heat exchanger groups can be adjusted by adjusting the number of the first heat exchangers connected to the indoor unit and the compressor. The powers of different compressor units are different. The multi-connected air conditioner disclosed in this solution includes first heat exchanger groups with adjustable capacities and compressor units with different powers. When the load rate of the indoor units where the multi-connected air conditioner operates is relatively low, the total capacity of the N first heat exchanger groups can be adjusted, and / or the compressor units with power meeting the requirements can be switched to work, so that the load rate of the indoor units, the total capacity of the N first heat exchanger groups, and the total power of the compressor units are matched, reducing the power consumption of the multi-connected air conditioner.

[0026] This solution also discloses an air conditioning system, including an indoor unit and an outdoor unit. The indoor unit is connected in series with the outdoor unit. The outdoor unit is the outdoor unit described in any of the above solutions. Since the outdoor unit has the above technical effects, the multi-connected air conditioner with this outdoor unit also has the same technical effects, which will not be elaborated here.

[0027] This solution also discloses a control method for an air conditioning system, which is applicable to the multi-connected air conditioner described in the above solution, and includes adjusting the capacity of the first heat exchanger group and the power of the compressor unit of the outdoor unit according to the load rate of the indoor unit. Since the multi-connected air conditioner has the above technical effects, the control method for the multi-connected air conditioner applicable to this multi-connected air conditioner also has the same technical effects, which will not be elaborated here. Description of the Drawings

[0028] 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 following drawings are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings, and the present application can also be applied to other similar scenarios according to the provided drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0029] Figure 1 It is a refrigerant flow diagram of the air conditioning system disclosed in the present application in the heating mode and when the load rate of the indoor unit is small;

[0030] Figure 2 It is the refrigerant flow diagram of the air conditioning system disclosed in the present application in the heating mode with the load rate of the indoor unit being high;

[0031] Figure 3 It is the refrigerant flow diagram of the air conditioning system disclosed in the present application in the cooling mode with the load rate of the indoor unit being low;

[0032] Figure 4 It is the refrigerant flow diagram of the air conditioning system disclosed in the present application in the cooling mode with the load rate of the indoor unit being high;

[0033] Figure 5 It is the refrigerant flow diagram of the air conditioning system (with a second heat exchanger) disclosed in the application in the heating mode with the load rate of the indoor unit being low.

[0034] The description of the drawings is as follows:

[0035] 1 - First heat exchanger group; 11 - First heat exchanger; 12 - First pipeline; 13 - Second pipeline; 14 - First valve; 15 - Second valve; 16 - Sixth main pipeline; 17 - Seventh main pipeline; 2 - Compressor unit; 21 - Compressor; 22 - Third pipeline; 23 - Fourth pipeline; 24 - Third valve; 25 - Fourth valve; 26 - Fourth main pipeline; 27 - Fifth main pipeline; 3 - Indoor unit; 4 - Second heat exchanger; 5 - Gas - liquid separator; 6 - First main pipeline; 7 - Four - way reversing valve; 8 - Second main pipeline; 9 - Third main pipeline. Detailed implementation manners

[0036] The present application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, rather than limiting the application. The described embodiments are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0037] It should be noted that for the convenience of description, only the parts related to the relevant application are shown in the drawings. Without conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not mutually contradictory. All feasible feature combinations are the technical contents clearly recorded herein. Any one of the multiple sub - features included in the same statement can be independently applied without necessarily being applied together with other sub - features.

[0038] As shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements. An element defined by the statement "comprising one..." does not exclude the existence of other identical elements in the process, method, commodity, or device that includes the element.

[0039] Among them, in the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0040] Please refer to Figures 1-5 。

[0041] Some embodiments of this application disclose an outdoor unit, which has N groups of parallel first heat exchanger groups 1 and M groups of parallel compressor groups 2. The N first heat exchanger groups 1 and the M compressor groups 2 are connected in series, where N≥2, M≥2, and N and M are positive integers.

[0042] The first heat exchanger group 1 has n parallel first heat exchangers 11. Each first heat exchanger 11 is connected to the indoor unit 3 through a first pipeline 12, and each first heat exchanger 11 is connected to the compressor group 2 through a second pipeline 13.

[0043] The first heat exchanger group 1 is connected in series with the compressor group 2. The number of the first heat exchanger groups 1 is N, and the total capacities of different first heat exchanger groups 1 are different. The total capacity of the first heat exchanger group 1 is the sum of the capacities of the n first heat exchangers 11 in one first heat exchanger group 1. The number of the compressor groups 2 is M, and the total powers of different compressor groups 2 are different. The total power of the compressor group 2 is the sum of the capacities of the compressors 21 in one compressor group 2, where N≥2, M≥2, and N and M are positive integers.

[0044] The first heat exchanger group 1 has n first heat exchangers 11 in parallel. The first heat exchangers 11 are connected to the indoor unit 3 through the first pipelines 12, and the first heat exchangers 11 are connected to the compressor unit 2 through the second pipelines 13. At least one first pipeline 12 is provided with a first valve 14, and / or at least one second pipeline 13 is provided with a second valve 15. The first valve 14 is used to control whether the first heat exchanger 11 is connected to the indoor unit 3. By adjusting the opening number of the first valve 14, the number of the first heat exchangers 11 connected between the first heat exchanger group 1 and the indoor unit 3 is adjusted. The second valve 15 is used to control whether the first heat exchanger 11 is connected to the compressor unit 2. By adjusting the opening number of the second valve 15, the number of the first heat exchangers 11 connected between the first heat exchanger group 1 and the compressor unit 2 is adjusted. Wherein, n≥2 and n is a positive integer.

[0045] N groups of first heat exchanger groups 1 are in parallel. During actual operation, only one group of first heat exchanger groups 1 can be turned on, or at least two groups of first heat exchanger groups 1 can be turned on. In the embodiment where at least two groups of first heat exchanger groups 1 are turned on, the number of the first heat exchangers 11 connected between each first heat exchanger group 1 and the indoor unit 3 and the compressor unit 2 can be adjusted according to the load rate of the indoor unit 3, and then the total capacity of the multiple first heat exchanger groups 1 can be adjusted, that is, the total capacity is adjusted through the cooperation of multiple first heat exchanger groups 1.

[0046] Taking the example that there are 2 groups of the first heat exchanger groups 1, and each group of the first heat exchanger groups 1 has 2 first heat exchangers 11 arranged in parallel. For the convenience of subsequent description, the 2 groups of the first heat exchanger groups 1 are respectively named the first heat exchanger group A and the first heat exchanger group B. The 2 first heat exchangers 11 of the first heat exchanger group A are respectively named the first heat exchanger A1 and the first heat exchanger A2. The total capacity of the first heat exchanger group A is the sum of the capacities of the first heat exchanger A1 and the first heat exchanger A2. The capacity of the first heat exchanger A1 is less than the capacity of the first heat exchanger A2. The 2 first heat exchangers 11 of the second heat exchanger group B are respectively named the first heat exchanger B1 and the first heat exchanger B2. The total capacity of the first heat exchanger group B is the sum of the capacities of the first heat exchanger B1 and the first heat exchanger B2. The capacity of the first heat exchanger B1 is less than the capacity of the first heat exchanger B2. According to the change of the load rate of the indoor unit, the 2 groups of the first heat exchanger groups 1 can provide multiple capacities to match it. For example, the first type is that the first heat exchanger A1 and / or the first heat exchanger A2 of the first heat exchanger group A are connected to the indoor unit 3 and the compressor unit 2. The second type is that the first heat exchanger B1 and / or the first heat exchanger B2 of the first heat exchanger group B are connected to the indoor unit 3 and the compressor unit 2. The third type is the first heat exchanger A1 and the first heat exchanger B1. The fourth type is the first heat exchanger A1 and the first heat exchanger B2. The fifth type is the first heat exchanger A2 and the first heat exchanger B1. The sixth type is the first heat exchanger A2 and the first heat exchanger B2. The seventh type is the first heat exchanger A1, the first heat exchanger A2, the first heat exchanger B1 and the first heat exchanger B2. When the load rate of the indoor unit is relatively large, the first heat exchanger group A and the first heat exchanger group B are started simultaneously. The first heat exchanger A1 and the first heat exchanger A2 of the first heat exchanger group A, and the first heat exchanger B1 and the first heat exchanger B2 of the first heat exchanger group B are all connected to the indoor unit 3 and the compressor unit 2. When the load rate of the indoor unit is relatively small, one of the other several capacity-matching types can be selected.

[0047] Preferably, in this solution, one of the first heat exchangers 11 in each first heat exchanger group 1 is always connected to the indoor unit 3 and the compressor unit 2. The remaining first heat exchangers 11 in this first heat exchanger group 1 are controlled whether to be connected to the indoor unit 3 and the compressor unit 2 through the first valves 14 of their respective first pipelines 12 and / or the second valves 15 of the second pipelines 13. The first pipelines 12 and the second pipelines 13 of the first heat exchanger 11 that are always connected to the indoor unit 3 and the compressor unit 2 are not provided with the first valves 14 and the second valves 15 respectively. The sum of the capacities of the first heat exchangers 11 that are always connected to the indoor unit 3 and the compressor unit 2 is the minimum capacity requirement of the multi-connected air conditioner. At this time, the structure of the multi-connected air conditioner can be simplified to a certain extent.

[0048] The compressor unit 2 has at least one compressor 21. Specifically, the number of compressors 21 included in the compressor unit 2 can be one, or two or more.

[0049] In an embodiment where the compressor unit 2 includes a compressor 21, the power of the compressor unit 2 is the power of one compressor 21 it contains. The powers of different compressor units 2 are different. The third valve 24 is used to control the connection of compressor units 2 with different powers to the indoor unit 3, and / or the fourth valve 25 is used to control the connection of compressor units 2 with different powers to N first heat exchanger groups 1, so as to match the power of the compressor unit 2 with the load rate of the indoor unit 3. Taking the example of including two compressor units 2, each compressor unit 2 has one compressor 21, and the powers of the two compressor units 2 are different. When the load rate of the indoor unit 3 is small, the compressor unit 2 with a small power is connected to the indoor unit 3 to adjust the capacity of the N first heat exchanger groups 1, so that the total capacities of the indoor unit 3, the compressor unit 2, and the first heat exchanger group 1 are matched, reducing the power consumption of the outdoor unit.

[0050] In an embodiment where the compressor unit 2 includes two or more compressors 21, the total power of the compressor unit 2 is the sum of the powers of the multiple compressors 21 it contains. The number of compressors 21 in each compressor unit 2 connected to the indoor unit 3 is adjusted, and / or the number of compressors 1 in each compressor unit 2 connected to M first heat exchanger groups 1 is adjusted to adjust the total power of each compressor unit 2. During operation, the compressor unit 2 that matches the load rate of the indoor unit among the M compressor units 2 is connected to the indoor unit 3 and the first heat exchanger group 1. Taking the example that the outdoor unit has two compressor units 2 and each compressor unit 2 has two compressors 21, for the convenience of subsequent description, the two compressor units 2 are respectively named compressor unit A and compressor unit B. The two compressors 21 of compressor unit A are respectively named compressor A1 and compressor A2, and the total power of compressor unit A is the sum of the powers of compressor A1 and compressor A2. The two compressors 21 of compressor unit B are respectively named compressor B1 and compressor B2, and the total power of compressor unit B is the sum of the powers of compressor B1 and compressor B2. The power of compressor unit B is greater than that of compressor unit A. There are multiple powers for the two compressor units 2. For example, the first one is compressor A1 and / or compressor A2, and the second one is compressor B1 and / or compressor B2. When the load rate of the indoor unit is large, both compressor B1 and compressor B2 of compressor unit B are connected to the indoor unit 3 and the first heat exchanger group 1. When the load rate of the indoor unit is small, compressor A1 and / or compressor A2 of compressor unit A are connected to the indoor unit 3 and the first heat exchanger group 1.

[0051] As Figures 1-2 shown, an embodiment where the indoor unit includes two parallel first heat exchanger groups 1 and two parallel compressor units 2, each first heat exchanger group 1 has two parallel first heat exchangers 11, and each compressor unit 2 has two parallel compressors 21. In this embodiment, when the load rate of the indoor unit is less than the preset range, as Figure 1As shown, the first heat exchanger A1 of the first heat exchanger group A and the first heat exchanger B1 of the second heat exchanger group B are connected to the indoor unit 3 and the compressor unit 2. The compressors A1 and A2 of the compressor unit A are connected to the indoor unit 3 and the first heat exchanger group 1. When the compressor unit A operates, the refrigerant flowing through the indoor unit 3 exchanges heat with the indoor-side environment, then enters the compressor unit A after passing through the gas-liquid separator 5, and then enters the first heat exchanger A1 of the first heat exchanger group A and the first heat exchanger B1 of the second heat exchanger group B respectively to exchange heat with the outdoor-side environment; when the load rate of the indoor unit is greater than the preset range, such as Figure 2 As shown, the first heat exchanger A1 and A2 of the first heat exchanger group A, and the first heat exchanger B1 and B2 of the second heat exchanger group B are all connected to the indoor unit 3 and the compressor unit 2. The compressors B1 and B2 of the compressor unit B are connected to the indoor unit 3 and the first heat exchanger group 1. It is switched to the compressor unit B to operate. The first heat exchanger A1 and A2 of the first heat exchanger group A, and the first heat exchanger B1 and B2 of the second heat exchanger group B all operate. The refrigerant flowing through the indoor unit 3 exchanges heat with the indoor-side environment, then enters the compressor unit B after passing through the gas-liquid separator 5, and then flows through the first heat exchanger A1, the first heat exchanger A2, the first heat exchanger B1 and the first heat exchanger B2 respectively to exchange heat with the outdoor-side environment.

[0052] Figure 1 and Figure 2 As shown, the indoor unit is in the cooling mode. By adding a four-way reversing valve between the compressor unit 2 and the indoor unit 3 and the first heat exchanger group 1, the heating of the indoor unit can be realized. The adjustment method of the heating mode is the same as that of the cooling mode, only the medium flow direction is different.

[0053] The powers of the m compressors 21 of the compressor unit 2 can be the same or different. In the embodiment where the powers of the m compressors 21 of the compressor unit 2 are different, the compressor 21 can perform more kinds of capacity adjustments.

[0054] The multi-connected air conditioner disclosed in this solution includes a first heat exchanger group 1 with adjustable capacity and a compressor unit 2 with different powers. When the number of indoor units 3 in operation of the multi-connected air conditioner is small, the capacity of the first heat exchanger group 1 and / or the total power of the compressor unit 2 can be adjusted to make the load rate of the indoor unit 3, the total capacity of the N first heat exchanger groups 1 match the total power of the compressor unit 2, and reduce the power consumption of the multi-connected air conditioner.

[0055] The load rate of the indoor unit 3 is the total number of actual running indoor unit horsepower / the total number of actually connected indoor unit horsepower X 100%.

[0056] The multi-connected air conditioner disclosed in this solution matches the total capacity and / or switching total power of N first heat exchanger groups 1 with a compressor unit 2 to switch the load capacity of the outdoor unit, so as to match the load rates of the indoor units, thereby reducing the energy consumption of the multi-connected air conditioner.

[0057] The outdoor unit of the multi-connected air conditioner includes two or more compressor units 2. The compressors 21 in each compressor unit 2 are distributed in the up-down direction, and different compressor units 2 are distributed in the left-right direction.

[0058] There are various ways to make the total powers of different compressors 2 different. For example, the number of compressors 21 set in each compressor unit 2 is the same, but at least one compressor 21 in different compressor units 2 has a different power; or, the powers of the compressors 21 in each compressor unit 2 are the same, but the number of compressors 21 set in different compressor units 2 is different; or, the number of compressors 21 set in different compressor units 2 is different, and the power of at least one compressor 21 in each compressor unit 2 is different from that of other compressors 21.

[0059] The heat exchanger heats the refrigerant flowing through the heat exchanger and the outdoor environment. The multi-connected air conditioner in the related art has the problem of low heat exchange efficiency. The first heat exchanger group 1 of the outdoor unit of the multi-connected air conditioner disclosed in this solution further includes a second heat exchanger 4 connected in series with the first heat exchanger 11. The second heat exchanger 4 performs secondary heat exchange on the refrigerant after heat exchange by the first heat exchanger 11 to improve the heat exchange efficiency.

[0060] In some other embodiments, the outdoor unit of the multi-connected air conditioner further includes a second heat exchanger group. At least one first heat exchanger group 1 is connected in series with the second heat exchanger group, and the second heat exchanger group has at least one second heat exchanger 4. Specifically, it can be that each first heat exchanger group 1 is connected in series with a second heat exchanger group, or at least two first heat exchanger groups 1 are jointly connected in series with a second heat exchanger group.

[0061] The second heat exchanger group can have only one second heat exchanger 4, or can have at least two second heat exchangers 4 connected in parallel.

[0062] In the embodiment where the second heat exchanger group has at least two second heat exchangers 4 connected in parallel, the capacities of different second heat exchangers 4 can be the same or different.

[0063] A gas-liquid separator 5 is further provided between the compressor unit 2 and the first heat exchanger group 1.

[0064] To Figures 1-4For example, the connection relationships among the indoor unit 3, the first heat exchanger group 1, the compressor unit 2, and the four-way reversing valve will be described in detail. A first main pipeline 6 is provided between the indoor unit 3 and the two first heat exchanger groups 1. The first main pipeline 6 is respectively connected to the two first heat exchanger groups 1 through two sixth main pipelines 16. The first pipeline 12 of the first heat exchanger 11 is connected to the sixth main pipeline 16. The indoor unit 3, the two first heat exchanger groups 1, and the two compressor units are connected through the four-way reversing valve 7. Specifically, there is a second main pipeline 8 between the indoor unit 3 and the four-way reversing valve 7, and there is a third main pipeline 9 between the two first heat exchanger groups 1 and the four-way reversing valve 7. The two first heat exchanger groups 1 are respectively connected to the third main pipeline 9 through two seventh main pipelines 17. The two first heat exchanger groups 1 and the two compressor units 2 are connected in series through the third main pipeline 9. There is a fourth main pipeline 26 between the fourth pipelines 23 of the two compressor units and the four-way reversing valve 7, and there is a fifth main pipeline 27 between the third pipelines 22 of the two compressor units and the four-way reversing valve 7.

[0065] The four-way reversing valve 7 has four ports, which are respectively named the first port, the second port, the third port, and the fourth port for the convenience of subsequent description. The first port is connected to the indoor unit 3 through the second main pipeline 8, the second port is connected to the first heat exchanger group 11 through the third main pipeline 9, the third port is connected to the third pipeline 22 of the compressor through the fifth main pipeline 27, and the fourth port is connected to the fourth pipeline 23 of the compressor through the fourth main pipeline 26. When the indoor unit is in the heating mode, the valve core of the four-way reversing valve is in the first working position, the first port is connected to the fourth port, and the second port is connected to the third port. The medium sequentially passes through the indoor unit 3, the first heat exchanger group 1, the second port, the third port, the compressor unit 2, the fourth port, and the first port, and returns to the indoor unit 3. When the indoor unit is in the cooling mode, the valve core of the four-way reversing valve is in the second working position, the first port is connected to the third port, and the second port is connected to the fourth port. The medium sequentially passes through the indoor unit 3, the first port, the third port, the compressor unit 2, the fourth port, the second port, and the first heat exchanger group 1, and returns to the indoor unit 3.

[0066] This solution also discloses an air conditioning system, including an indoor unit 3 and an outdoor unit. The indoor unit 3 is connected in series with the outdoor unit, where the outdoor unit is the outdoor unit described in any of the above solutions. Since the outdoor unit has the above technical effects, the multi-connected air conditioner with this outdoor unit also has the same technical effects and will not be elaborated here.

[0067] The number of indoor units 3 is at least two, and the indoor units 3 are connected in parallel with each other.

[0068] M compressor units 2 are connected to the indoor unit 3 through a gas-liquid separator 5; or,

[0069] M compressor units 2 are respectively connected to the indoor unit 3 through gas-liquid separators 5.

[0070] The present solution also discloses a control method for an air-conditioning system, which is applicable to the multi-connected air conditioner described in the above solution. The method includes:

[0071] Obtaining the load rate of the indoor unit;

[0072] When the load rate of the indoor unit 3 is greater than or equal to the preset range, increase the number of the first heat exchangers 11 connected to the indoor unit 3, and / or increase the power of the compressor unit 2 connected to the indoor unit 3;

[0073] When the load rate of the indoor unit 3 is less than or equal to the preset range, reduce the number of the first heat exchangers 11 connected to the indoor unit 3, and / or reduce the power of the compressor unit connected to the indoor unit.

[0074] Since the multi-connected air conditioner has the above technical effects, the control method for the multi-connected air conditioner applicable to the multi-connected air conditioner also has the same technical effects, which will not be elaborated here.

[0075] Among them, increasing the number of the first heat exchangers 11 connected to the indoor unit 3 may be increasing the number of the first heat exchangers 11 in a single first heat exchanger group 1 connected to the indoor unit 3, or increasing the number of the first heat exchangers 11 in at least two first heat exchanger groups 1 connected to the indoor unit 3;

[0076] Increasing the power of the compressor unit 2 connected to the indoor unit 3 may be switching the compressor unit 2 with a large power to be connected to the indoor unit 3, or increasing the number of the compressors 21 working in a single compressor unit 2;

[0077] Reducing the number of the first heat exchangers 11 connected to the indoor unit 3 may be reducing the number of the first heat exchangers 11 in a single first heat exchanger group 1 connected to the indoor unit 3, or reducing the number of the first heat exchangers 11 in at least two first heat exchanger groups 1 connected to the indoor unit 3;

[0078] Reducing the power of the compressor unit connected to the indoor unit may be switching the compressor unit 2 with a small power to be connected to the indoor unit 3, or reducing the number of the compressors 21 working in a single compressor unit 2.

[0079] The control method for the multi-connected air conditioner disclosed in the present solution can make the load rates of the outdoor unit and the indoor unit match only by adjusting the capacity of the first heat exchanger group 1 and / or the power of the compressor unit 2.

[0080] Figures 1-5For an embodiment of a multi-connected air conditioner having two compressor units 2 and two first heat exchanger groups 1, where each compressor unit 2 has two compressors 21 and each first heat exchanger group 1 has two first heat exchangers 11. For the convenience of subsequent description, the two first heat exchanger groups 1 are respectively named the first heat exchanger group A and the first heat exchanger group B. The two first heat exchangers 11 of the first heat exchanger group A are respectively named the first heat exchanger A1 and the first heat exchanger A2, and the capacity of the first heat exchanger A1 is less than that of the first heat exchanger A2. The two first heat exchangers 11 of the second heat exchanger group B are respectively named the first heat exchanger B1 and the first heat exchanger B2, and the capacity of the first heat exchanger B1 is less than that of the first heat exchanger B2. The total capacity of the first heat exchanger group A is the sum of the capacities of the first heat exchanger A1 and the first heat exchanger A2, and the total capacity of the first heat exchanger group B is the sum of the capacities of the first heat exchanger B1 and the first heat exchanger B2. The two compressor units 2 are respectively named the compressor unit A and the compressor unit B. The two compressors 21 of the compressor unit A are respectively named the compressor A1 and the compressor A2, and the two compressors 21 of the compressor unit B are respectively named the compressor B1 and the compressor B2. The power of the compressor A1 and the compressor A2 is less than that of the compressor B1 and the compressor B2, that is, the power of the compressor unit B is greater than that of the compressor unit A. The total power of the compressor unit A is the sum of the powers of the compressor A1 and the compressor A2, and the total power of the compressor unit B is the sum of the powers of the compressor B1 and the compressor B2.

[0081] When the load rate of the indoor unit is less than the preset range, the first heat exchanger A1 of the first heat exchanger group A and the first heat exchanger B1 of the second heat exchanger group B are connected to the indoor unit 3 and the compressor unit 2. The compressor A1 and the compressor A2 of the compressor unit A are connected to the indoor unit 3 and the first heat exchanger group 1. The compressor unit A operates. After the refrigerant flowing through the indoor unit 3 exchanges heat with the indoor environment, it enters the compressor unit A after passing through the gas-liquid separator 5, and then enters the first heat exchanger A1 of the first heat exchanger group A and the first heat exchanger B1 of the second heat exchanger group B respectively to exchange heat with the outdoor environment.

[0082] When the load rate of the indoor unit is greater than the preset range, the first heat exchanger A1 and A2 of the first heat exchanger group A, and the first heat exchanger B1 and B2 of the second heat exchanger group B are all connected to the indoor unit 3 and the compressor unit 2. At the same time, the number of the first heat exchanger groups of the first heat exchanger group A and the second heat exchanger group B connected to the indoor unit 3 and the compressor unit 2 is increased. The compressor B1 and B2 of the compressor unit B are connected to the indoor unit 3 and the first heat exchanger group 1, and the compressor unit B with a larger total power is switched to work. The first heat exchanger A1 and A2 of the first heat exchanger group A, and the first heat exchanger B1 and B2 of the second heat exchanger group B all work. After the refrigerant flowing through the indoor unit 3 exchanges heat with the indoor-side environment, it enters the compressor unit B after passing through the gas-liquid separator 5, and then flows through the first heat exchanger A1, the first heat exchanger A2, the first heat exchanger B1 and the first heat exchanger B2 respectively to exchange heat with the outdoor-side environment.

[0083] Figure 1 and Figure 2 The figure shows the refrigeration mode. Figure 1 It shows the working conditions of the first heat exchanger group and the compressor unit when the load rate of the indoor unit is less than the preset range. Figure 2 It shows the working conditions of the first heat exchanger group and the compressor unit when the load rate of the indoor unit is greater than the preset range.

[0084] When the load rate of the indoor unit is less than the preset range, the compressor unit A works. After the refrigerant flowing through the indoor unit 3 exchanges heat with the indoor-side environment, it enters the first heat exchanger A1 of the first heat exchanger group A and the first heat exchanger B1 of the second heat exchanger group B respectively. After exchanging heat with the outdoor-side environment, it enters the compressor unit A after passing through the gas-liquid separator 5.

[0085] When the load rate of the indoor unit is greater than the preset range, the compressor unit B is switched to work. The first heat exchanger A1 and A2 of the first heat exchanger group A, and the first heat exchanger B1 and B2 of the second heat exchanger group B all work. After the refrigerant flowing through the indoor unit 3 exchanges heat with the indoor-side environment, it flows through the first heat exchanger A1, the first heat exchanger A2, the first heat exchanger B1 and the first heat exchanger B2 respectively. After exchanging heat with the outdoor-side environment, it enters the compressor unit B after passing through the gas-liquid separator 5.

[0086] By adding a four-way reversing valve between the compressor unit 2, the indoor unit 3 and the first heat exchanger group 1, the heating of the indoor unit can be realized. The adjustment method of the heating mode is the same as that of the refrigeration mode, only the medium flow direction is different. Figure 3 and Figure 4 The figure shows the heating mode. Figure 3 It shows the working conditions of the first heat exchanger group and the compressor unit when the load rate of the indoor unit is less than the preset range. Figure 4 It shows the working conditions of the first heat exchanger group and the compressor unit when the load rate of the indoor unit is greater than the preset range.

[0087] The multi-connected air conditioner disclosed in this solution adjusts the compressor unit 2 and the first heat exchanger unit 1 to switch the load capacity of the outdoor unit, thereby reducing the energy consumption of the multi-connected air conditioner.

[0088] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles, and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. The scope of the application involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above application concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An outdoor unit, characterized in that, It includes N groups of parallel first heat exchanger groups (1) and M groups of parallel compressor groups (2). The N groups of the first heat exchanger groups (1) are connected in series with the M groups of the compressor groups (2), where N≥2, M≥2, and N and M are positive integers. The first heat exchanger group (1) has n parallel first heat exchangers (11). Each first heat exchanger (11) is connected to the indoor unit (3) through a first pipeline (12), and each first heat exchanger (11) is connected to the compressor group (2) through a second pipeline (13). At least one of the first pipelines (12) is provided with a first valve (14) to adjust the number of the first heat exchangers (11) connected between the first heat exchanger group (1) and the indoor unit (3), and / or at least one of the second pipelines (13) is provided with a second valve (15) to adjust the number of the first heat exchangers (11) connected between the first heat exchanger group (1) and the compressor group (2), where n≥2 and n is a positive integer. The compressor group (2) has at least one compressor (21). The compressor (21) is connected to the indoor unit (3) through a third pipeline (22), and the compressor (21) is connected to the first heat exchanger group (1) through a fourth pipeline (23). A third valve (24) is provided on the third pipeline (22). The third valve (24) is used to adjust the power of the compressor group (2) connected to the indoor unit (3), and / or a fourth valve (25) is provided on the fourth pipeline (23) to adjust the number of the compressors (21) of the compressor group (2) connected to the first heat exchanger group (1).

2. The outdoor unit according to claim 1, characterized in that, The total power between different compressor groups (2) is different.

3. The outdoor unit according to claim 2, wherein The number of compressors (21) provided in each compressor group (2) is the same, and the power of at least one compressor (21) is different between different groups. Or, the power of each compressor (21) is the same, and the number of compressors (21) provided in different compressor groups (2) is different.

4. The outdoor unit according to claim 1, characterized in that, The first heat exchanger group (1) further includes a second heat exchanger (4) connected in series with the first heat exchanger (11).

5. The outdoor unit according to claim 1, characterized in that, It further includes a second heat exchanger group. At least one of the first heat exchanger groups (1) is connected in series with the second heat exchanger group. Preferably, the second heat exchanger group has at least one second heat exchanger (4).

6. The outdoor unit according to claim 5, characterized in that, When the number of the second heat exchangers (4) in the second heat exchanger group is multiple, the capacities of the multiple second heat exchangers (4) are the same or different.

7. The outdoor unit according to claim 1, characterized in that The capacities of the n first heat exchangers (11) in the first heat exchanger group (1) are the same or different.

8. The outdoor unit according to claim 1, wherein, A gas-liquid separator (5) is further provided between the compressor group (2) and the first heat exchanger group (1).

9. An air conditioning system, characterized in that, It includes an indoor unit (3) and an outdoor unit. The outdoor unit is connected in series with the indoor unit (3), and the outdoor unit is the outdoor unit according to any one of claims 1-8.

10. A control method for an air conditioning system, characterized in that, Applied to the air conditioning system according to claim 9, the method includes: Obtaining the load rate of the indoor unit. When the load rate of the indoor unit (3) is greater than or equal to a preset range, increase the number of the first heat exchangers (11) communicated with the indoor unit (3), and / or increase the power of the compressor unit communicated with the indoor unit (3); When the load rate of the indoor unit (3) is less than or equal to a preset range, reduce the number of the first heat exchangers (11) communicated with the indoor unit (3), and / or reduce the power of the compressor unit communicated with the indoor unit.

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