Air conditioning system

Abstract

The present application relates to the technical field of refrigeration equipment and discloses an air conditioning system, comprising: a compressor; a heat exchanger; a multi-stage heat exchanger, including first to Nth heat exchangers; first to Nth branches, wherein the first to Nth branches are respectively provided with first to Nth throttling devices; the compressor, the heat exchanger, and the multi-stage heat exchanger are connected in sequence, wherein the heat exchanger and the multi-stage heat exchanger are connected via the first to Nth branches, one end of each of the first to Nth branches is connected to the heat exchanger, the other end of each of the first to Nth branches is respectively connected to the first refrigerant inlet and outlet of the first to Nth heat exchangers, and the second refrigerant inlet and outlet of the first to Nth heat exchangers is respectively connected to the compressor, and N is an integer greater than or equal to 2. The present application can set multiple evaporating temperatures in an air conditioning system, and use different evaporating temperatures to perform temperature and humidity control on the air, thereby achieving precise processing of temperature and humidity control requirements and reducing the energy consumption of the air conditioning system.

Description

Technical Field

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

[0002] Currently, traditional air conditioning systems use a refrigeration dehumidification method, where the treated air is cooled until saturated, then cooled and dehumidified. This method of air heat and humidity treatment is called temperature-humidity coupled treatment. The sensible heat ratio of existing air conditioning systems is generally between 0.7 and 0.8.

[0003] However, indoor sensible heat ratios vary across regions, and even within the same region, they can vary at different times of the day. Air conditioning systems based on temperature and humidity coupling use indoor temperature as a control parameter. When the sensible heat ratio of the air conditioning system's equipment exceeds the indoor sensible heat ratio, the relative humidity of the indoor air will be high. In this situation, people will try to lower the air conditioning temperature to achieve a more comfortable temperature and humidity environment. This approach can lead to a sharp increase in power consumption and a significant decrease in cooling energy efficiency. In a field test of temperature and humidity control in a residence in a hot and humid region, lowering the air conditioner set point from 26°C to 25°C increased power consumption by approximately 50%.

[0004] It can be seen that the traditional method of achieving satisfactory comfort by lowering the air temperature will lead to a significant increase in the energy consumption of the air-conditioning system, which is not conducive to the efficient use of energy. Summary of the Invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide an air conditioning system to solve the problem that the existing method of obtaining satisfactory comfort by lowering the air temperature leads to high energy consumption of the air conditioning system.

[0007] According to an embodiment of the present invention, an air-conditioning system is provided, comprising: a compressor; a heat exchange element; a multi-stage heat exchanger, comprising first to N-th heat exchangers; first to N-th branches, wherein the first to N-th branches are respectively provided with first to N-th throttling devices; the compressor, the heat exchange element and the multi-stage heat exchanger are connected in sequence, wherein the heat exchange element and the multi-stage heat exchanger are connected through the first to N-th branches, one end of the first to N-th branches is connected to the heat exchange element, and the other end of the first to N-th branches is respectively connected to the first refrigerant inlet and outlet of the first to N-th heat exchangers, and the second refrigerant inlet and outlet of the first to N-th heat exchangers are respectively connected to the compressor, and N is an integer greater than or equal to 2.

[0008] Optionally, the second refrigerant inlets and outlets of the first to N-1th heat exchangers are respectively connected to the first refrigerant inlets and outlets of the second to Nth heat exchangers.

[0009] Optionally, the second refrigerant inlet and outlet of the Nth heat exchanger is directly connected to the compressor, and the second refrigerant inlets and outlets of the first to N-1th heat exchangers are all connected to the compressor through the second refrigerant inlet and outlet of the Nth heat exchanger.

[0010] Optionally, the first to Nth heat exchangers are arranged in sequence along the flow direction of the air.

[0011] Optionally, the air-conditioning system further includes: a controller, which is connected to the first to Nth throttling devices, and controls the air-conditioning system to operate in a constant humidity and cooling mode in response to a constant humidity and cooling instruction, controls the first to i-th throttling devices to be turned on, and the i+1 to N-th throttling devices to be turned off, and the evaporation temperatures of the first to i-th heat exchangers are all higher than the dew point temperature, and the evaporation temperatures of the first to i-th heat exchangers decrease sequentially, wherein i is an integer greater than or equal to 1 and less than or equal to N.

[0012] Optionally, the air-conditioning system further includes: a controller, which is connected to the first to Nth throttling devices, and controls the air-conditioning system to operate in a constant temperature dehumidification mode in response to a constant temperature dehumidification instruction, controls the first to Nth throttling devices to be turned on, and the Nth throttling device to be fully opened, the evaporation temperature of the first heat exchanger is equal to the dew point temperature, and the evaporation temperatures of the second to N-1th heat exchangers decrease successively and are all lower than the dew point temperature.

[0013] Optionally, the air-conditioning system further includes: a controller, which is connected to the first to Nth throttling devices, and controls the air-conditioning system to operate in a high-efficiency cooling and dehumidification mode in response to a high-efficiency cooling and dehumidification instruction, controls the first to Nth throttling devices to be turned on, and the evaporation temperatures of the first to Nth heat exchangers decrease successively, the absolute value of the difference between the evaporation temperature TI of the Ith heat exchanger and the dew point temperature is less than or equal to a preset difference, the evaporation temperatures of the first to I-1th heat exchangers are greater than the dew point temperature, and the evaporation temperatures of the I+1th to Nth heat exchangers are less than the dew point temperature, wherein I is an integer greater than 1 and less than N, and N is an integer greater than or equal to 3.

[0014] Optionally, the controller is also used to: in response to a high-efficiency cooling and dehumidification instruction, if the indoor humidity is greater than a preset humidity range, the controller controls the air-conditioning system to operate in a constant temperature dehumidification mode until the indoor humidity is within the preset humidity range; in response to a high-efficiency cooling and dehumidification instruction, if the indoor humidity is within the preset humidity range, the controller controls the air-conditioning system to operate in a high-efficiency cooling and dehumidification mode.

[0015] Optionally, the air-conditioning system further includes: a controller, which is connected to the first to Nth throttling devices, and controls the air-conditioning system to operate in a heating mode in response to a heating instruction, controls the first throttling device to be turned on, and controls the second to Nth throttling devices to be closed, and the refrigerant flowing out of the compressor passes through the Nth to first heat exchangers in sequence and then flows from the first throttling device into the heat exchange element.

[0016] Optionally, the air conditioning system further includes: a diverter device, wherein one end of the first to Nth branches is connected to the heat exchange element through the diverter device.

[0017] The air conditioning system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] By providing first to Nth throttling devices and first to Nth heat exchangers, the evaporation temperatures of the corresponding first to Nth heat exchangers can be controlled by adjusting the openings of the first to Nth throttling devices. The relationship between the evaporation temperature and the dew point temperature affects the cooling and dehumidification performance of the heat exchanger. Therefore, the cooling and dehumidification performance of the first to Nth heat exchangers can be adjusted by controlling the openings of the first to Nth throttling devices, thereby enabling multiple evaporation temperatures to be set in a single air conditioning system. Air temperature and humidity can be controlled separately using different evaporation temperatures, achieving precise processing of temperature and humidity control requirements, reducing the energy consumption of the air conditioning system, and solving the problem of significantly increased air conditioner energy consumption caused by traditional methods.

[0019] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0021] Figure 1 is a structural diagram of an air conditioning system provided by an embodiment of the present disclosure;

[0022] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0023] Figure 3 is a structural diagram of another air-conditioning system provided by an embodiment of the present disclosure;

[0024] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at D in the middle;

[0025] Figure 5 is a structural diagram of another air-conditioning system provided by an embodiment of the present disclosure;

[0026] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at E in the middle.

[0027] Reference numerals:

[0028] 10. Compressor; 20. Four-way valve; 201. First port; 202. Second port; 203. Third port; 204. Fourth port; 30. Heat exchanger; 40. Multi-stage heat exchanger; 401. First heat exchanger; 4011. First refrigerant inlet and outlet of the first heat exchanger; 4012. Second refrigerant inlet and outlet of the first heat exchanger; 402. Second heat exchanger; 4021. First refrigerant inlet and outlet of the second heat exchanger; 4022. Second refrigerant inlet and outlet of the second heat exchanger; 403. Third heat exchanger; 4 031, the first refrigerant inlet and outlet of the third heat exchanger; 4032, the second refrigerant inlet and outlet of the third heat exchanger; 40N, the Nth heat exchanger; 40N1, the first refrigerant inlet and outlet of the Nth heat exchanger; 40N2, the second refrigerant inlet and outlet of the Nth heat exchanger; 501, the first throttling device; 502, the second throttling device; 503, the third throttling device; 50N, the Nth throttling device; 60, the diverter device; 701, the first branch; 702, the second branch; 703, the third branch; 70N, the Nth branch. DETAILED DESCRIPTION

[0029] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0030] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0032] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0036] Combine Figure 1-6 As shown, an embodiment of the present disclosure provides an air conditioning system, including a compressor 10, a heat exchange element 30, a multi-stage heat exchanger 40, and first to Nth throttling devices. The compressor 10, the heat exchange element 30, and the multi-stage heat exchanger 40 are connected in sequence.

[0037] Optionally, the air conditioning system further includes a reversing element, which may be a four-way valve 20 .

[0038] like Figure 1 、 Figure 3 and Figure 5 As shown, the exhaust port of the compressor 10 is connected to the first port 201 of the four-way valve 20, the second port 202 of the four-way valve 20 is connected to the heat exchange element 30, the third port 203 of the four-way valve 20 is connected to the multi-stage heat exchanger 40, and the fourth port 204 of the four-way valve 20 is connected to the return air port of the compressor 10.

[0039] The first port 201 of the four-way valve 20 selectively communicates with one of the second port 202 and the third port 203, and the fourth port 204 selectively communicates with the other of the second port 202 and the third port 203. Taking the communication between the first port 201 and the second port 202 as an example, the refrigerant discharged from the exhaust port of the compressor 10 flows sequentially through the first port 201, the second port 202, the heat exchange element 30, the multi-stage heat exchanger 40, and then flows back to the return port of the compressor 10 through the third port 203 and the fourth port 204.

[0040] The multi-stage heat exchanger 40 includes first to N-th heat exchangers, where N is an integer greater than or equal to 2.

[0041] The heat exchange element 30 is connected to the multi-stage heat exchanger 40 via the first to Nth branches, such as Figure 1 and Figure 5 , the first branch 701, the second branch 702, the third branch 703...the Nth branch 70N.

[0042] The first to N branches are respectively provided with the first to N throttling devices, one end of the first to N branches is connected to the heat exchange element 30, the other end of the first to N branches is respectively connected to the first refrigerant inlet and outlet of the first to N heat exchangers, and the second refrigerant inlet and outlet of the first to N heat exchangers are connected to the compressor 10.

[0043] The Mth throttling device is provided in the Mth branch, one end of the Mth branch being connected to the heat exchange element 30, and the other end being connected to the first refrigerant inlet and outlet of the Mth heat exchanger, where M is an integer greater than or equal to 1 and less than or equal to N. The Mth throttling device may be an electronic expansion valve or a capillary tube, etc.

[0044] The refrigerant flowing out of the heat exchange element 30 flows through the first to Nth branches into the first refrigerant inlets and outlets of the first to Nth heat exchangers respectively, and then flows back to the compressor 10 from the second refrigerant inlets and outlets of the first to Nth heat exchangers through the four-way valve 20.

[0045] By setting up the first through Nth throttling devices, the evaporation temperatures of the first through Nth heat exchangers can be controlled individually by adjusting their openings, allowing multiple evaporation temperatures to be set within the same air conditioning system. Changes in evaporation temperature affect the relationship between evaporation temperature and dew point temperature, thereby affecting the cooling and dehumidification capabilities of the heat exchanger. Multiple different evaporation temperatures enable different cooling and dehumidification capabilities for each heat exchanger. Therefore, multiple evaporation temperatures can be used to separately control the temperature and humidity of the air, achieving precise control of temperature and humidity requirements, eliminating the traditional coupled temperature and humidity processing method.

[0046] Alternatively, as Figure 2 、 Figure 4 and Figure 6As shown, the second refrigerant inlets and outlets of the first to N-1th heat exchangers are respectively connected to the first refrigerant inlets and outlets of the second to Nth heat exchangers.

[0047] In this scheme, if Figure 1 and Figure 5 As shown, when cooling and / or dehumidification is required (for example, constant humidity cooling mode, constant temperature dehumidification mode or high energy efficiency cooling and dehumidification mode), the refrigerant flows from the first throttling device 501 into the first refrigerant inlet and outlet 4011 of the first heat exchanger, and then flows out from the second refrigerant inlet and outlet 4012 of the first heat exchanger and flows into the first refrigerant inlet and outlet 4021 of the second heat exchanger, and the refrigerant flowing from the second throttling device 502 through the first refrigerant inlet and outlet 4021 of the second heat exchanger is equal to the refrigerant flowing in from the second throttling device 502 The combined refrigerant flows through the second heat exchanger 402 and out of the second refrigerant inlet and outlet 4022 of the second heat exchanger, flowing into the first refrigerant inlet and outlet 4031 of the third heat exchanger, where it merges with the refrigerant flowing in from the third throttling device 503 through the first refrigerant inlet and outlet 4031 of the third heat exchanger. The combined refrigerant flows through the third heat exchanger 403... until it flows back to the return air port of the compressor 10 through the second refrigerant inlet and outlet 40N2 of the Nth heat exchanger. During cooling or dehumidification, the heat exchange element is the condenser and the heat exchanger is the evaporator.

[0048] During the refrigerant flow process, the refrigerant flowing out of the Mth heat exchanger participates in the heat exchange cycle of the M+1th heat exchanger, fully utilizing the refrigeration capacity of the refrigerant to achieve significant energy saving and efficiency improvement, where M is an integer greater than or equal to 1 and less than N.

[0049] In some embodiments, the second refrigerant inlet and outlet of the mth heat exchanger is connected to two branches: one branch (the first branch) is connected to the first refrigerant inlet and outlet of the (m+1)th heat exchanger, and the other branch (the second branch) is connected to the compressor. In this way, the refrigerant flowing out of the second refrigerant inlet and outlet of the mth heat exchanger is split into two paths: one path enters the (m+1)th heat exchanger through the first branch, and the other path enters the compressor through the second branch, where m is an integer greater than or equal to 1 and less than N.

[0050] When N is 2, the second refrigerant inlet and outlet 4012 of the first heat exchanger is connected to the first refrigerant inlet and outlet 4021 of the second heat exchanger.

[0051] In order to facilitate the connection of the second refrigerant inlet and outlet of the first to N-1 heat exchangers with the first refrigerant inlet and outlet of the second to N heat exchangers, the first to N heat exchangers are fitted in sequence, and the first refrigerant inlet and outlet of the R heat exchanger and the second refrigerant inlet and outlet of the R+1 heat exchanger are located in the length direction of the multi-stage heat exchanger (such as Figure 2 on the same side of the upper and lower directions), where R is an integer greater than or equal to 1 and less than N.

[0052] Optionally, the second refrigerant inlets and outlets of the first to N-1th heat exchangers are all connected to the compressor 10 through the second refrigerant inlet and outlet 40N2 of the Nth heat exchanger.

[0053] In this scheme, if Figure 3 As shown, when heating is required, the refrigerant flowing out of the compressor 10 flows through the four-way valve 20 and then into the second refrigerant inlet and outlet 40N2 of the Nth heat exchanger. The refrigerant then flows out through the first refrigerant inlet and outlet 40N1 of the Nth heat exchanger. When the Nth throttle device 50N is closed, all the refrigerant enters the second refrigerant inlet and outlet of the N-1th heat exchanger and flows out through the first refrigerant inlet and outlet of the N-1th heat exchanger. When the N-1 throttle device is closed, all the refrigerant enters the second refrigerant inlet and outlet of the N-2th heat exchanger, and so on, until the refrigerant flows out through the first refrigerant inlet and outlet 4011 of the first heat exchanger. When the Nth throttle device 50N is opened, part of the refrigerant enters the second refrigerant inlet and outlet of the N-1th heat exchanger, and part of the refrigerant enters the Nth throttle device 50N. When the N-1 throttle device is opened, part of the refrigerant enters the second refrigerant inlet and outlet of the N-2th heat exchanger, and part of the refrigerant enters the N-1 throttle device. Among them, when heating, the heat exchange element is the evaporator and the heat exchanger is the condenser.

[0054] During heating, the refrigerant flows through the Nth to the first heat exchangers 401 in sequence, making full use of the multi-stage heat exchanger 40 to enhance the heating capacity of the air-conditioning system.

[0055] In the present application, the second refrigerant inlets and outlets of the first to N-1 heat exchangers are respectively connected to the first refrigerant inlets and outlets of the second to N heat exchangers, and the second refrigerant inlets and outlets of the first to N-1 heat exchangers are all connected to the compressor 10 through the second refrigerant inlet and outlet 40N2 of the N heat exchanger, thereby avoiding the refrigerant flowing out of the first to N heat exchangers directly returning to the compressor 10, resulting in insufficient utilization of the refrigerant energy and energy waste.

[0056] When N is 2, the second refrigerant inlet and outlet 4012 of the first heat exchanger is connected to the first refrigerant inlet and outlet 4021 of the second heat exchanger.

[0057] Optionally, the first to Nth heat exchangers are arranged in sequence along the flow direction of the air. In other words, the air flows through the first to Nth heat exchangers in sequence and is blown out from the air outlet of the indoor unit of the air conditioning system.

[0058] In this solution, the first to Nth heat exchangers are arranged in sequence along the flow direction of the air. When the evaporation temperatures of the first to Nth heat exchangers are gradient-controlled, when the air flows through the Pth heat exchanger, the Pth heat exchanger can heat up or cool down the air after passing through the P-1th heat exchanger to meet the user's temperature requirements. It can also make full use of the energy of the Pth heat exchanger to further reduce the energy consumption of the air-conditioning system, where P is an integer greater than 1 and less than or equal to N.

[0059] like Figures 1 to 6 In the figure, the arrows in rows at the multi-stage heat exchanger indicate the direction of air flow, the arrows in rows at the heat exchange element indicate the direction of air flow, and the other arrows indicate the direction of refrigerant flow.

[0060] Alternatively, as Figure 1 As shown, the air-conditioning system further includes a controller, which is connected to the first to Nth throttling devices. In response to a constant humidity and cooling instruction, the controller controls the air-conditioning system to operate in a constant humidity and cooling mode, controls the first to i-th throttling devices to be turned on, and the i+1 to N-th throttling devices 50N to be closed, and the evaporation temperatures of the first to i-th heat exchangers are all higher than the dew point temperature, and the evaporation temperatures of the first to i-th heat exchangers decrease sequentially, wherein i is an integer greater than or equal to 1 and less than or equal to N.

[0061] like Figure 1 and Figure 3 As shown, taking N=3 as an example, in constant humidity and cooling mode, the first throttling device 501 and the second throttling device 502 can be open, the third throttling device 503 can be closed, and the third heat exchanger 403 does not participate in the refrigeration cycle. The openings of the first throttling device 501 and the second throttling device 502 are adjusted. After throttling, the evaporation temperature of the first heat exchanger 401 is higher than the dew point temperature, and the evaporation temperature of the second heat exchanger 402 is slightly higher than the dew point temperature (for example, the difference from the dew point temperature is less than 5°C). Air flows through the first and second heat exchangers 401 and 402 for constant humidity and cooling, and only the sensible heat load in the air is treated. Alternatively, the first throttling device 501 can be opened, and the second throttling device 502 and the third throttling device 503 can be closed. The opening of the first throttling device 501 is adjusted. After throttling, the evaporation temperature of the first heat exchanger 401 is higher than the dew point temperature, and air flows through the first heat exchanger 401 for constant humidity and cooling, and only the sensible heat load in the air is treated.

[0062] Taking N=4 as an example, in constant humidity and cooling mode, the first throttling device 501 can be controlled to be open, and the second to fourth throttling devices can be closed. Alternatively, the first and second throttling devices 502 can be controlled to be open, and the third and fourth throttling devices can be closed. Alternatively, the first to third throttling devices 503 can be controlled to be open, and the fourth throttling device can be closed. Taking the first to third throttling devices 503 as an example of being open and the fourth throttling device being closed, in constant humidity and cooling mode, the evaporation temperatures of the first to third heat exchangers 403 are all higher than the dew point temperature, and the evaporation temperature of the first heat exchanger 401 is higher than the evaporation temperature of the second heat exchanger 402, and the evaporation temperature of the second heat exchanger 402 is higher than the evaporation temperature of the third heat exchanger 403.

[0063] This solution can achieve a constant humidity cooling mode by controlling the first to Nth throttling devices, meeting the user's requirements for rapid cooling.

[0064] Alternatively, as Figure 1As shown, the air-conditioning system further includes a controller, which is connected to the first to Nth throttling devices. In response to the constant temperature dehumidification instruction, the controller controls the air-conditioning system to operate in a constant temperature dehumidification mode, controls the first to Nth throttling devices to be turned on, and the Nth throttling device 50N is fully opened. The evaporation temperature of the first heat exchanger 401 is equal to the dew point temperature, and the evaporation temperatures of the second to N-1th heat exchangers decrease successively and are all lower than the dew point temperature.

[0065] In the constant temperature dehumidification mode, the first to Nth throttling devices are all open, among which the opening degrees of the first to N-1th throttling devices are less than 1, that is, the first to Nth throttling devices are not fully opened and all have a certain throttling effect.

[0066] Taking N=3 as an example, after throttling control, the evaporation temperature of the first heat exchanger 401 is equal to the dew point temperature, and the evaporation temperature of the second heat exchanger 402 is lower than the dew point temperature. The air flows through the second heat exchanger 402 to achieve a strong dehumidification function. The third throttling device 503 can be fully opened. At this time, the evaporation temperature of the third heat exchanger 403 can be approximately the same as the outlet temperature of the heat exchange element 30. The purpose is to make the air that has undergone the previous strong cooling and dehumidification process be heated when flowing through the third heat exchanger 403, so as to achieve a constant temperature dehumidification effect.

[0067] Taking N=4 as an example, the evaporation temperature of the first heat exchanger 401 after throttling control is equal to the dew point temperature, the evaporation temperatures of the second heat exchanger 402 and the third heat exchanger 403 are both lower than the dew point temperature, and the evaporation temperature of the second heat exchanger 402 is greater than the evaporation temperature of the third heat exchanger 403. The air flows through the second heat exchanger 402 and the third heat exchanger 403 to achieve a strong dehumidification function. The fourth throttling device can be fully opened. At this time, the evaporation temperature of the fourth heat exchanger can be approximately the same as the outlet temperature of the heat exchanger 30. The purpose is to make the air that has undergone the previous strong cooling and dehumidification process be heated when flowing through the third heat exchanger 403, so as to achieve a constant temperature dehumidification effect.

[0068] Alternatively, as Figure 1 As shown, the air-conditioning system also includes a controller, which is connected to the first to Nth throttling devices. In response to the high-efficiency cooling and dehumidification instruction, the controller controls the air-conditioning system to operate in the high-efficiency cooling and dehumidification mode, controls the first to Nth throttling devices to be turned on, and the evaporation temperatures of the first to Nth heat exchangers decrease in sequence. The absolute value of the difference between the evaporation temperature TI of the Ith heat exchanger and the dew point temperature is less than or equal to the preset difference. The evaporation temperatures of the first to I-1th heat exchangers are greater than the dew point temperature, and the evaporation temperatures of the I+1th to Nth heat exchangers 40N are less than the dew point temperature, wherein I is an integer greater than 1 and less than N, and N is an integer greater than or equal to 3.

[0069] In the high-efficiency cooling and dehumidification mode, taking N=3 as an example, all the first to third throttling devices 503 are open, with different opening degrees. The first throttling device 501 has a relatively low throttling degree, and the evaporation temperature T1 in the first heat exchanger 401 is relatively high (higher than the dew point temperature T0). Air passing through the first heat exchanger 401 is cooled, primarily bearing the cooling load of the sensible heat of the air. The second throttling device 502 has a higher throttling degree than the first throttling device 501, and the evaporation temperature T2 of the second heat exchanger 402 is relatively low (approximately equal to the dew point temperature T0). The difference between the evaporation temperature T2 and the dew point temperature is less than a preset difference, for example, 1°C. Therefore, the air flowing through the second heat exchanger 402 undergoes primary cooling and radial dehumidification, achieving both cooling and dehumidification effects. The third throttling device 503 has the highest throttling degree, and the evaporation temperature T3 of the third heat exchanger 403 is the lowest (lower than the dew point temperature). Therefore, the air flowing through the third heat exchanger 403 undergoes further dehumidification.

[0070] Taking N=4 as an example, in the high-efficiency cooling and dehumidification mode, the first to fourth throttling devices are all turned on, the evaporation temperature of the first heat exchanger 401, the evaporation temperature of the second heat exchanger 402, the heat exchanger temperature of the third heat exchanger 403, and the evaporation temperature of the fourth heat exchanger are reduced in sequence, and the absolute value of the difference between the evaporation temperature of the second heat exchanger 402 or the third heat exchanger 403 and the dew point temperature is less than or equal to the preset difference.

[0071] In this solution, while ensuring that the cooling / dehumidification functions are primarily undertaken by the first to Nth heat exchangers, the refrigerant flowing out of the Ath heat exchanger participates in the heat exchange cycle of the A+1th heat exchanger, fully utilizing the cooling capacity of the refrigerant flowing through the first to N-1th heat exchangers. This greatly improves the energy efficiency of the refrigeration system and has extremely strong practical value, where A is greater than or equal to 1 and less than N.

[0072] Optionally, the air conditioning system further comprises a detection device for detecting indoor humidity, the detection device being connected to the controller. The detection device may be a humidity sensor or other device capable of directly or indirectly detecting indoor humidity.

[0073] The controller is connected to the detection device. In response to the high-efficiency cooling and dehumidification instruction, the indoor humidity detected by the detection device is sent to the controller. The controller performs the following control according to the indoor humidity: if the indoor humidity is greater than the preset humidity range, the controller controls the air-conditioning system to operate in a constant temperature dehumidification mode until the indoor humidity is within the preset humidity range; if the indoor humidity is within the preset humidity range, the controller controls the air-conditioning system to operate in a high-efficiency cooling and dehumidification mode.

[0074] In response to the high-efficiency cooling and dehumidification instruction, when the indoor humidity is greater than the preset humidity range, it means that the indoor humidity is high, and the controller controls the air-conditioning system to run the constant temperature dehumidification mode first, so as to quickly reduce the indoor humidity; when the indoor humidity is within the preset humidity range, in response to the high-efficiency cooling and dehumidification instruction, the controller controls the air-conditioning system to run the high-efficiency cooling and dehumidification mode until the indoor temperature reaches the target temperature range and the indoor humidity reaches the target humidity range.

[0075] Alternatively, as Figure 3 As shown, the air-conditioning system also includes a controller, which is connected to the first to Nth throttling devices. In response to the heating instruction, the controller controls the air-conditioning system to operate in the heating mode, controls the first throttling device 501 to be turned on, and controls the second to Nth throttling devices 50N to be closed. The refrigerant flowing out of the compressor 10 passes through the Nth to first heat exchangers 401 in sequence and then flows from the first throttling device 501 into the heat exchange element 30.

[0076] In this solution, during heating mode, the refrigerant flowing out of the compressor 10 first flows through the multi-stage heat exchanger 40 and then through the heat exchange element 30. While flowing through the multi-stage heat exchanger 40, the refrigerant sequentially flows through the Nth to the first heat exchangers 401, and after flowing out of the first refrigerant inlet and outlet 4011 of the first heat exchanger, it flows through the first throttling device 501 and into the heat exchange element 30.

[0077] In the heating mode, the refrigerant flows through the first to Nth heat exchangers, that is, the refrigerant flows through all the heat exchangers, thereby improving the heating capacity of the air-conditioning system.

[0078] Optionally, the air conditioning system further includes a diverter device 60 , and one end of the first to Nth branches is connected to the heat exchange element 30 via the diverter device.

[0079] A flow dividing device is provided to realize parallel connection of the first to N-th branches, so that the refrigerant flowing out of the heat exchange element 30 is distributed by the flow dividing device and then flows into the first to N-th branches.

[0080] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An air conditioning system, characterized in that: include: compressor; Heat exchange components; A multi-stage heat exchanger, comprising first to Nth heat exchangers; The first to Nth branches are respectively provided with the first to Nth throttling devices; Four-way valve; The compressor, the heat exchange element, and the multi-stage heat exchanger are connected in sequence, wherein the heat exchange element and the multi-stage heat exchanger are connected via first to N-th branches, one end of each of the first to N-th branches is connected to the heat exchange element, the other ends of each of the first to N-th branches are connected to the first refrigerant inlet and outlet of the first to N-th heat exchangers, respectively, and the second refrigerant inlet and outlet of the first to N-th heat exchangers are connected to the compressor, where N is an integer greater than or equal to 2; The second refrigerant inlets and outlets of the first to N-1 heat exchangers are respectively connected to the first refrigerant inlets and outlets of the second to N heat exchangers; The second refrigerant inlet and outlet of the Nth heat exchanger is directly connected to the compressor, and the second refrigerant inlets and outlets of the first to N-1th heat exchangers are all connected to the compressor through the second refrigerant inlet and outlet of the Nth heat exchanger; The system further includes: a controller connected to the first to Nth throttling devices, responding to a constant humidity and cooling instruction, controlling the air conditioning system to operate in a constant humidity and cooling mode, controlling the first to ith throttling devices to be opened, and the i+1th to Nth throttling devices to be closed, and the evaporation temperatures of the first to ith heat exchangers are all higher than the dew point temperature, and the evaporation temperatures of the first to ith heat exchangers are successively reduced, wherein i is an integer greater than or equal to 1 and less than or equal to N, or, responding to a constant temperature dehumidification instruction, controlling the air conditioning system to operate in a constant temperature and dehumidification mode, controlling the first to Nth throttling devices to be opened, and the Nth throttling device to be fully opened, and the evaporation temperature of the first heat exchanger is equal to dew point temperature, the evaporating temperatures of the second to N-1 heat exchangers decrease in sequence and are all lower than the dew point temperature, or, in response to the high-efficiency cooling and dehumidification instruction, the air-conditioning system is controlled to operate in the high-efficiency cooling and dehumidification mode, the first to N throttling devices are controlled to be opened, the evaporating temperatures of the first to N heat exchangers decrease in sequence, the absolute value of the difference between the evaporating temperature TI of the I heat exchanger and the dew point temperature is less than or equal to the preset difference, the evaporating temperatures of the first to I-1 heat exchangers are greater than the dew point temperature, and the evaporating temperatures of the I+1 to N heat exchangers are less than the dew point temperature, wherein I is an integer greater than 1 and less than N, and N is an integer greater than or equal to 3.

2. The air conditioning system according to claim 1, characterized in that Along the flow direction of the air, the first to Nth heat exchangers are arranged in sequence.

3. The air conditioning system according to claim 1, characterized in that The controller is also used for: In response to a high-efficiency cooling and dehumidification instruction, if the indoor humidity is greater than a preset humidity range, the controller controls the air conditioning system to operate in a constant temperature dehumidification mode until the indoor humidity is within the preset humidity range; In response to the high energy efficiency cooling and dehumidification instruction, if the indoor humidity is within the preset humidity range, the controller controls the air conditioning system to operate in the high energy efficiency cooling and dehumidification mode.

4. The air conditioning system according to claim 1 or 2, characterized in that: In response to the heating instruction, the controller controls the air-conditioning system to operate in the heating mode, controls the first throttling device to open, and controls the second to Nth throttling devices to close. The refrigerant flowing out of the compressor passes through the Nth to first heat exchangers in sequence and then flows from the first throttling device into the heat exchange element.

5. The air conditioning system according to claim 1 or 2, characterized in that: Also includes: A flow dividing device, wherein one end of each of the first to Nth branches is connected to the heat exchange element through the flow dividing device.

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