CN218120030U - Air conditioning system - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment, and discloses an air conditioning system, including: a compressor; a heat exchange member; a multistage heat exchanger including first to Nth heat exchangers; the first to the Nth branches are respectively provided with a first to an Nth throttling device; the compressor, the heat exchange piece and the multistage heat exchanger are connected in sequence, wherein the heat exchange piece is connected with the multistage heat exchanger through a first branch to an Nth branch, one ends of the first branch to the Nth branch are connected with the heat exchange piece, the other ends of the first branch to the Nth branch are connected with a first refrigerant inlet and outlet of the first heat exchanger to the Nth heat exchanger respectively, a second refrigerant inlet and outlet of the first heat exchanger to the Nth heat exchanger are connected with the compressor, and N is an integer greater than or equal to 2. This application can set up a plurality of evaporating temperature in an air conditioning system, utilizes different evaporating temperature to carry out temperature and humidity branch accuse to the air, realizes the accurate processing of temperature and humidity control demand, has reduced the energy consumption of air conditioning system operation.

Description

Air conditioning system

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to an air conditioning system.

Background

At present, a traditional air conditioning system adopts a freezing dehumidification mode, the temperature of the processed air and other humidity is reduced to saturation, and then the temperature is reduced and the dehumidification is carried out, wherein the air heat and humidity processing mode is called temperature and humidity coupling processing. The sensible heat ratio of the existing air conditioning system is generally between 0.7 and 0.8.

However, the indoor sensible heat ratios are different in different areas, and even in the same area, the indoor sensible heat ratios are different at different times of a day. The air conditioning system based on temperature and humidity coupling processing takes indoor temperature as a control parameter, and when the equipment sensible heat ratio of the air conditioning system is larger than the indoor sensible heat ratio, the relative humidity of indoor air is higher. At the moment, people can obtain a relatively comfortable warm and humid environment by reducing the temperature of the air conditioner, the method can cause the sharp increase of power consumption and the great reduction of refrigeration energy efficiency, the set temperature of the air conditioner is reduced from 26 ℃ to 25 ℃ by actually measuring the temperature and humidity of a certain house in a hot and humid area, and the power consumption is increased by about 50%.

Therefore, the conventional method for obtaining satisfactory comfort level by reducing air temperature can cause great increase of energy consumption in operation of the air conditioning system, and is not beneficial to efficient utilization of energy.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides an air conditioning system to solve the problem that the energy consumption of the air conditioning system is large due to the fact that the existing method for obtaining the satisfactory comfort level through reducing the air temperature is adopted.

According to the utility model discloses an embodiment provides an air conditioning system, include: a compressor; a heat exchange member; a multistage heat exchanger including first to Nth heat exchangers; the first to the Nth branches are respectively provided with a first to an Nth throttling device; the compressor, the heat exchange piece and the multistage heat exchanger are connected in sequence, wherein the heat exchange piece is connected with the multistage heat exchanger through the first to the Nth branches, one ends of the first to the Nth branches are connected with the heat exchange piece, the other ends of the first to the Nth branches are connected with a first refrigerant inlet and outlet of the first to the Nth heat exchangers respectively, a second refrigerant inlet and outlet of the first to the Nth heat exchangers are connected with the compressor, and N is an integer greater than or equal to 2.

Optionally, the second refrigerant inlets and outlets of the first to N-1 heat exchangers are respectively connected with the first refrigerant inlets and outlets of the second to N heat exchangers.

Optionally, a second refrigerant inlet and outlet of the nth heat exchanger is directly connected with the compressor, and second refrigerant inlets and outlets of the first to nth-1 heat exchangers are connected with the compressor through a second refrigerant inlet and outlet of the nth heat exchanger.

Alternatively, the first to nth heat exchangers may be disposed in sequence in a flow direction of air.

Optionally, the air conditioning system further comprises: the controller is connected with the first throttling device to the Nth throttling device, responds to a constant humidity cooling instruction, controls the air conditioning system to operate a constant humidity cooling mode, controls the first throttling device to the ith throttling device to be opened, controls the ith throttling device to be closed, controls the evaporation temperature of the first heat exchanger to the ith heat exchanger to be higher than the dew point temperature, and sequentially reduces the evaporation temperature of the first heat exchanger to the ith heat exchanger, wherein i is an integer which is more than or equal to 1 and less than or equal to N.

Optionally, the air conditioning system further comprises: the controller is connected with the first throttling device to the Nth throttling device, responds to a constant temperature dehumidification instruction, controls the air conditioning system to operate in a constant temperature dehumidification mode, controls the first throttling device to the Nth throttling device to be opened, completely opens the Nth throttling device, and enables the evaporation temperature of the first heat exchanger to be equal to the dew point temperature and the evaporation temperature of the second heat exchanger to the Nth-1 heat exchanger to be reduced in sequence and to be lower than the dew point temperature.

Optionally, the air conditioning system further comprises: the controller is connected with the first throttling device, the second throttling device, the third throttling device, the fourth throttling device and the fourth throttling device, responds to an energy-efficient cooling and dehumidifying instruction, controls the air-conditioning system to operate an energy-efficient cooling and dehumidifying mode, controls the first throttling device, the second throttling device and the fourth throttling device to be opened, and sequentially reduces the evaporating temperature of the first heat exchanger, the second throttling device, the third throttling device and the fourth throttling device, the absolute value of the difference between the evaporation temperature TI of the I-th heat exchanger and the dew point temperature is smaller than or equal to a preset difference, the evaporation temperatures of the first to I-1-th heat exchangers are larger than the dew point temperature, the evaporation temperatures of the I + 1-Nth heat exchangers are smaller than the dew point temperature, wherein I is an integer larger than 1 and smaller than N, and N is an integer larger than or equal to 3.

Optionally, the controller is further configured to: responding to a high-energy-efficiency cooling and dehumidifying instruction, and if the indoor humidity is larger than a preset humidity range, controlling the air conditioning system to operate a constant-temperature dehumidifying mode by the controller until the indoor humidity is in the preset humidity range; responding to the high-energy-efficiency cooling and dehumidifying instruction, and if the indoor humidity is in the preset humidity range, controlling the air conditioning system to operate the high-energy-efficiency cooling and dehumidifying mode by the controller.

Optionally, the air conditioning system further comprises: and the controller is connected with the first throttling device, the second throttling device, the Nth throttling device and the Nth throttling device, responds to a heating instruction, controls the air-conditioning system to operate in a heating mode, controls the first throttling device to be opened, controls the second throttling device, the Nth throttling device and the Nth throttling device to be closed, and controls the refrigerant flowing out of the compressor to flow into the heat exchange piece from the first throttling device after sequentially passing through the Nth throttling device and the first heat exchanger.

Optionally, the air conditioning system further comprises: and the one ends of the first to Nth branches are connected with the heat exchange piece through the flow dividing device.

The air conditioning system provided by the embodiment of the disclosure can realize the following technical effects:

the first to Nth throttling devices and the first to Nth heat exchangers are arranged, so that the evaporation temperatures of the corresponding first to Nth heat exchangers can be controlled by adjusting the opening degrees of the first to Nth throttling devices. The relation of evaporating temperature and dew point temperature, influence the effect of heat exchanger refrigeration and dehumidification, consequently, can be through the first refrigeration and the dehumidification effect to the Nth heat exchanger of the aperture adjustment of controlling first to Nth throttling arrangement respectively, thereby can set up a plurality of evaporating temperature in an air conditioning system, utilize different evaporating temperature to carry out temperature and humidity branch accuse to the air, realize the accurate processing of temperature and humidity control demand, the energy consumption of air conditioning system operation has been reduced, the problem that the air conditioner energy consumption that the traditional approach leads to increases by a wide margin is solved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of the structure at B in FIG. 1;

FIG. 3 is a schematic structural diagram of another air conditioning system provided by an embodiment of the present disclosure;

FIG. 4 is an enlarged schematic view of FIG. 3 at D;

fig. 5 is a schematic structural diagram of yet another air conditioning system provided by an embodiment of the present disclosure;

fig. 6 is an enlarged schematic view of fig. 5 at E.

Reference numerals:

10. a compressor; 20. a four-way valve; 201. a first port; 202. a second port; 203. a third port; 204. a fourth port; 30. a heat exchange member; 40. a multi-stage heat exchanger; 401. a first heat exchanger; 4011. a first refrigerant inlet and outlet of the first heat exchanger; 4012. a second refrigerant inlet and outlet of the first heat exchanger; 402. a second heat exchanger; 4021. a first refrigerant inlet and outlet of the second heat exchanger; 4022. a second refrigerant inlet and outlet of the second heat exchanger; 403. a third heat exchanger; 4031. a first refrigerant inlet and outlet of the third heat exchanger; 4032. a second refrigerant inlet and outlet of the third heat exchanger; 40N, nth heat exchanger; 40N1 and a first refrigerant inlet and outlet of the Nth heat exchanger; a 40N2 and a second refrigerant inlet and outlet of the Nth heat exchanger; 501. a first throttling device; 502. a second throttling device; 503. a third throttling means; 50N, an Nth throttling device; 60. a flow divider; 701. a first branch; 702. a second branch circuit; 703. a third branch; 70N, the Nth branch.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1 to 6, an embodiment of the present disclosure provides an air conditioning system including a compressor 10, a heat exchange member 30, a multistage heat exchanger 40, and first to nth throttling devices. The compressor 10, the heat exchange member 30 and the multi-stage heat exchanger 40 are connected in sequence.

Optionally, the air conditioning system further comprises a reversing member, which may be a four-way valve 20.

As shown in fig. 1, 3 and 5, an exhaust port of the compressor 10 is connected to a first port 201 of the four-way valve 20, a second port 202 of the four-way valve 20 is connected to the heat exchange member 30, a third port 203 of the four-way valve 20 is connected to the multi-stage heat exchanger 40, and a fourth port 204 of the four-way valve 20 is connected to a return port of the compressor 10.

A first port 201 of four-way valve 20 is selectively in communication with one of a second port 202 and a third port 203, and a fourth port 204 is selectively in communication with the other of second port 202 and third port 203. Taking the first port 201 and the second port 202 as an example, the refrigerant discharged from the discharge port of the compressor 10 flows through the first port 201, the second port 202, the heat exchange member 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.

The multistage heat exchanger 40 includes first to nth heat exchangers, N being an integer greater than or equal to 2.

The heat exchange member 30 is connected with the multi-stage heat exchanger 40 through first to nth branches, such as a first branch 701, a second branch 702, a third branch 703 \ 8230, and an nth branch 70N in fig. 1 and 5.

The first to nth branches are respectively provided with first to nth throttling devices, one ends of the first to nth branches are connected with the heat exchange member 30, the other ends of the first to nth branches are respectively connected with first refrigerant inlets and outlets of the first to nth heat exchangers, and second refrigerant inlets and outlets of the first to nth heat exchangers are connected with the compressor 10.

The Mth throttling device is arranged on the Mth branch, one end of the Mth branch is connected with the heat exchange piece 30, the other end of the Mth branch is connected with a first refrigerant inlet and outlet of the Mth heat exchanger, wherein M is an integer which is more than or equal to 1 and less than or equal to N. Wherein, the Mth throttling device can be an electronic expansion valve or a capillary tube, etc.

The refrigerant flowing out of the heat exchanger 30 flows through the first to nth branches, respectively flows into the first refrigerant inlet and outlet of the first to nth heat exchangers, and then flows back to the compressor 10 through the four-way valve 20 from the second refrigerant inlet and outlet of the first to nth heat exchangers.

The first throttling device, the second throttling device, the third throttling device and the fourth throttling device are arranged in the air conditioning system, the evaporating temperatures of the first heat exchanger, the second heat exchanger and the fourth heat exchanger can be respectively controlled by adjusting the opening degrees of the first throttling device, the second throttling device and the fourth throttling device, and therefore a plurality of evaporating temperatures can be set in the same air conditioning system. The change of evaporating temperature influences the relation of evaporating temperature and dew point temperature to influence the cooling and dehumidification ability of heat exchanger, a plurality of different evaporating temperatures make a plurality of heat exchangers can have different cooling and dehumidification ability. Therefore, the temperature and humidity of the air can be controlled separately by utilizing a plurality of different evaporation temperatures, the temperature and humidity control requirements can be accurately processed, and the traditional temperature and humidity coupling processing mode is abandoned.

Alternatively, as shown in fig. 2, 4 and 6, the second refrigerant inlet and outlet of the first to N-1 heat exchangers are respectively connected to the first refrigerant inlet and outlet of the second to N-th heat exchangers.

In this embodiment, as shown in fig. 1 and 5, when refrigeration and/or dehumidification (for example, a constant-humidity cooling mode, a constant-temperature dehumidification mode, or an energy-efficient cooling and dehumidification mode) is required, after a refrigerant flows into the first refrigerant inlet and outlet 4011 of the first heat exchanger from the first throttle device 501, the refrigerant flows out from the second refrigerant inlet and outlet 4012 of the first heat exchanger, flows into the first refrigerant inlet and outlet 4021 of the second heat exchanger, and merges with the refrigerant flowing in from the second throttle device 502 through the first refrigerant inlet and outlet 4021 of the second heat exchanger, the merged refrigerant flows through the second heat exchanger 402, flows out from the second refrigerant inlet and outlet 4022 of the second heat exchanger, flows into the first inlet and outlet 4031 of the third heat exchanger, merges with the refrigerant flowing in from the third throttle device 503 through the first refrigerant inlet and outlet 4031 of the third heat exchanger, and flows through the third heat exchanger 403, 8230, and finally flows back to the return port of the compressor 10 through the second refrigerant inlet and outlet 4031 of the third heat exchanger 503. When refrigerating or dehumidifying, the heat exchange piece is a condenser, and the heat exchanger is an evaporator.

In the flowing process of the refrigerant, the refrigerant flowing out of the Mth heat exchanger participates in the heat exchange circulation of the Mth +1 heat exchanger, the refrigerating capacity of the refrigerant is fully utilized, and the energy-saving effect improvement is greatly achieved, wherein M is an integer which is larger than or equal to 1 and smaller than N.

In some embodiments, the second refrigerant inlet and outlet of the mth heat exchanger is connected to two branches, wherein one branch (first branch) is connected to the first refrigerant inlet and outlet of the (m + 1) th heat exchanger, and the other branch (second branch) is connected to the compressor. Therefore, the refrigerant flowing out of the second refrigerant inlet and outlet of the mth heat exchanger is divided into two paths, one path enters the (m + 1) th heat exchanger through the first branch, the other path enters the compressor through the second branch, and m is an integer which is greater than or equal to 1 and less than N.

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.

In order to facilitate the connection between the second refrigerant inlets and outlets of the first to the N-1 heat exchangers and the first refrigerant inlets and outlets of the second to the N-1 heat exchangers, the first to the N-th heat exchangers are sequentially attached, and the first refrigerant inlet and outlet of the R-th heat exchanger and the second refrigerant inlet and outlet of the R +1 heat exchanger are located on the same side of the multistage heat exchanger in the length direction (vertical direction in fig. 2), wherein R is an integer greater than or equal to 1 and less than N.

Alternatively, the second refrigerant inlets and outlets of the first to N-1 heat exchangers are connected to the compressor 10 through the second refrigerant inlet and outlet 40N2 of the nth heat exchanger.

In the scheme, as shown in fig. 3, when heating is needed, a refrigerant flowing out of a compressor 10 flows into a second refrigerant inlet/outlet 40N2 of an nth heat exchanger after passing through a four-way valve 20, the refrigerant flows out of a first refrigerant inlet/outlet 40N1 of the nth heat exchanger, when an nth throttling device 50N is closed, all the refrigerants enter a second refrigerant inlet/outlet of an N-1 heat exchanger and flow out of a first refrigerant inlet/outlet of the N-1 heat exchanger, and when the N-1 throttling device is closed, all the refrigerants enter a second refrigerant inlet/outlet of an N-2 heat exchanger, \8230, 8230, and then flow out of a first refrigerant inlet/outlet 4011 of a first heat exchanger. When the nth throttling device 50N is opened, part of the refrigerant enters the second refrigerant inlet and outlet of the N-1 heat exchanger, and part of the refrigerant enters the nth throttling device 50N. When the N-1 throttling device is opened, part of the refrigerant enters a second refrigerant inlet and outlet of the N-2 heat exchanger, and part of the refrigerant enters the N-1 throttling device. Wherein, when heating, the heat transfer piece is the evaporimeter, and the heat exchanger is the condenser.

During heating, the refrigerant sequentially flows through the Nth heat exchanger 401 to the first heat exchanger 401, so that the multi-stage heat exchanger 40 is fully utilized, and the heating capacity of the air-conditioning system is enhanced.

In the application, the second refrigerant access ports of the first to the N-1 heat exchangers are respectively connected with the first refrigerant access ports of the second to the N-1 heat exchangers, and the second refrigerant access ports of the first to the N-1 heat exchangers are connected with the compressor 10 through the second refrigerant access port 40N2 of the N-1 heat exchanger, so that the energy consumption waste caused by the fact that the refrigerant energy is not fully utilized due to the fact that the refrigerant flowing out of the first to the N-1 heat exchangers directly returns to the compressor 10 is avoided.

When N is 2, the second refrigerant inlet/outlet 4012 of the first heat exchanger is connected to the first refrigerant inlet/outlet 4021 of the second heat exchanger.

Alternatively, the first to nth heat exchangers are arranged in sequence along the flowing direction of the air, in other words, the air is blown out from the air outlet of the indoor unit of the air conditioning system after flowing through the first to nth heat exchangers in sequence.

In the scheme, the first to the Nth heat exchangers are sequentially arranged along the flowing direction of air, when the evaporating temperature of the first to the Nth heat exchangers is subjected to gradient regulation and control, when the air flows through the P-th heat exchanger, the P-th heat exchanger can heat or cool the air flowing through the P-1-th heat exchanger, the requirement on the temperature of a user is met, the energy of the P-th heat exchanger can be fully utilized, the energy consumption of an air conditioning system is further reduced, and P is an integer which is larger than 1 and smaller than or equal to N.

As shown in fig. 1 to 6, the rows of arrows at the multi-stage heat exchanger indicate the air flow direction, the rows of arrows at the heat exchange members indicate the air flow direction, and the other arrows indicate the refrigerant flow direction.

Optionally, as shown in fig. 1, the air conditioning system further includes a controller, the controller is connected to the first to nth throttling devices, and in response to a constant humidity cooling command, the controller controls the air conditioning system to operate a constant humidity cooling mode, controls the first to ith throttling devices to be opened, controls the ith to nth throttling devices 50N to be closed, controls the evaporation temperatures of the first to ith heat exchangers to be higher than the dew point temperature, and sequentially reduces the evaporation temperatures of the first to ith heat exchangers, where i is an integer greater than or equal to 1 and less than or equal to N.

As shown in fig. 1 and 3, taking N =3 as an example, in the constant humidity cooling mode, the first throttling device 501 and the second throttling device 502 may be opened, the third throttling device 503 is closed, the third heat exchanger 403 does not participate in the refrigeration cycle, the opening degrees of the first throttling device 501 and the second throttling device 502 are adjusted, the evaporation temperature of the first heat exchanger 401 after throttling regulation is higher than the dew point temperature, the evaporation temperature of the second heat exchanger 402 is slightly higher than the dew point temperature (for example, the difference between the evaporation temperature and the dew point temperature is less than 5 ℃), and the air passes through the first heat exchanger 401 and the second heat exchanger 402 to be subjected to constant humidity cooling, so that only sensible heat load in the air is treated. The first throttling device 501 can be opened, the second throttling device 502 and the third throttling device 503 can be closed, the opening degree of the first throttling device 501 is adjusted, the evaporation temperature of the first heat exchanger 401 after throttling regulation is higher than the dew point temperature, air flows through the first heat exchanger 401 to be subjected to constant humidity cooling, and only sensible heat load in the air is processed.

Taking N =4 as an example, in the constant humidity cooling mode, the first throttling device 501 may be controlled to be opened, the second throttling device to the fourth throttling device may be controlled to be closed, the first throttling device 502 may be controlled to be opened, the third throttling device and the fourth throttling device may be controlled to be closed, or the first throttling device to the third throttling device 503 may be controlled to be opened, and the fourth throttling device may be controlled to be closed. Taking the first to third throttling devices 503 as an example, and the fourth throttling device is turned off, in the constant humidity cooling mode, the evaporation temperatures of the first to third heat exchangers 403 are all higher than the dew point temperature, 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.

This scheme through the control to first to Nth throttling arrangement, can realize the constant humidity cooling mode, satisfies user rapid cooling's requirement.

Optionally, as shown in fig. 1, the air conditioning system further includes a controller, the controller is connected to the first to nth throttling devices, and in response to a constant temperature dehumidification command, the controller controls the air conditioning system to operate a constant temperature dehumidification mode, controls the first to nth throttling devices to be all turned on, and controls the nth throttling device 50N to be fully turned on, the evaporation temperature of the first heat exchanger 401 is equal to the dew point temperature, and the evaporation temperatures of the second to nth-1 heat exchangers are sequentially decreased and are all lower than the dew point temperature.

In the constant-temperature dehumidification mode, the first to the Nth throttling devices are all opened, wherein the opening degrees of the first to the Nth throttling devices are smaller than 1, namely the first to the Nth throttling devices are not completely opened and have certain throttling effects.

Taking N =3 as an example, the evaporation temperature of the first heat exchanger 401 after throttling regulation is equal to the dew point temperature, 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 realize a powerful dehumidification function, the third throttling device 503 can be fully opened, the evaporation temperature of the third heat exchanger 403 can be approximately the same as the outlet temperature of the heat exchange member 30, and the purpose is to heat up the air subjected to the powerful cooling and dehumidification before flowing through the third heat exchanger 403, so as to realize a constant-temperature dehumidification effect.

Taking N =4 as an example, the evaporation temperature of the first heat exchanger 401 after throttling regulation 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 higher 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 realize the powerful 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 exchange member 30, so as to heat up the air after being subjected to the powerful cooling and dehumidification before when flowing through the third heat exchanger 403, and realize the constant temperature dehumidification effect.

Optionally, as shown in fig. 1, the air conditioning system further includes a controller, the controller is connected to the first to nth throttling devices, and in response to the high-energy-efficiency cooling and dehumidifying command, the controller controls the air conditioning system to operate the high-energy-efficiency cooling and dehumidifying mode, controls the first to nth throttling devices to be all turned on, sequentially lowers the evaporation temperatures of the first to nth heat exchangers, an absolute value of a difference between an evaporation temperature TI of the ith heat exchanger and a dew point temperature is less than or equal to a preset difference, the evaporation temperatures of the first to I-1 heat exchangers are greater than the dew point temperature, and the evaporation temperatures of the I +1 to N heat exchangers 40N are less than the dew point temperature, where I is an integer greater than 1 and less than N, and N is an integer greater than or equal to 3.

In the energy-efficient cooling and dehumidifying mode, taking N =3 as an example, the first to third throttling devices 503 are all opened, the opening degrees of the first to third throttling devices 503 are different, wherein the throttling degree of the first throttling device 501 is smaller, the evaporation temperature T1 in the first heat exchanger 401 is higher (higher than the dew point temperature T0), and the air passes through the first heat exchanger 401 for cooling, so that the cooling load of the sensible heat part of the air is mainly borne; the throttling degree of the second throttling device 502 is greater than that of the first throttling device 501, the evaporating temperature T2 of the second heat exchanger 402 is lower (approximately equal to the dew point temperature T0), and the difference between the evaporating temperature T2 and the dew point temperature is smaller than a preset difference, for example, the preset difference is 1 ℃, main cooling radiation dehumidification treatment is performed on the air flowing through the second heat exchanger 402, and cooling and dehumidification effects are achieved; the throttling degree of the third throttling device 503 is the maximum, the evaporation temperature T3 of the third heat exchanger 403 is the lowest (lower than the dew point temperature), and the air flowing through the third heat exchanger 403 is further dehumidified.

Taking N =4 as an example, in the energy-efficient cooling and dehumidifying 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 sequentially reduced, 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 a preset difference.

In this scheme, on guaranteeing that the cooling/dehumidification function basis that first to nth heat exchanger is mainly undertaken, the refrigerant that the A heat exchanger flows all participates in the heat transfer circulation of A +1 heat exchanger, and the refrigerant refrigeration ability of first to the N-1 heat exchanger of make full use of flow through has very big improvement the refrigerating system efficiency, has extremely strong practical value, and wherein, A is more than or equal to 1 and is less than N.

Optionally, the air conditioning system further comprises a detection device for detecting the indoor humidity, and the detection device is connected with the controller. The detection device may be a humidity sensor or other device capable of directly or indirectly detecting the humidity in the room.

The controller is connected with detection device, responds to high-energy efficiency cooling dehumidification instruction, and the indoor humidity that detection device detected sends to the controller, and the controller carries out following control according to indoor humidity: if the indoor humidity is larger than the preset humidity range, the controller controls the air conditioning system to operate the 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 the high-energy-efficiency cooling and dehumidifying mode.

Responding to a high-energy-efficiency cooling and dehumidifying instruction, when the indoor humidity is larger than a preset humidity range, indicating that the indoor humidity is larger, and controlling an air conditioning system to operate a constant-temperature dehumidifying mode by a controller so as to quickly reduce the indoor humidity; when the indoor humidity is within the preset humidity range, the controller controls the air conditioning system to operate the high-energy-efficiency cooling and dehumidifying mode in response to the high-energy-efficiency cooling and dehumidifying instruction until the indoor temperature reaches the target temperature range and the indoor humidity reaches the target humidity range.

Optionally, as shown in fig. 3, the air conditioning system further includes a controller, the controller is connected to the first to nth throttling devices, and responds to a heating instruction to control the air conditioning system to operate in a heating mode, so as to control the first throttling device 501 to be opened, the second to nth throttling devices 50N to be closed, and the refrigerant flowing out of the compressor 10 sequentially passes through the nth to first heat exchangers 401 and then flows into the heat exchange member 30 from the first throttling device 501.

In this embodiment, when the heating mode is operated, the refrigerant flowing out of the compressor 10 flows through the multi-stage heat exchanger 40 and then flows through the heat exchange member 30. When flowing through the multistage heat exchanger 40, the refrigerant flows through the nth to first heat exchangers 401 in sequence, flows out of the first refrigerant inlet/outlet 4011 of the first heat exchanger, and then flows into the heat exchange unit 30 through the first throttling device 501.

In the heating mode, the refrigerant flows through all the first to the Nth heat exchangers, namely the refrigerant, so that the heating capacity of the air conditioning system is improved.

Optionally, the air conditioning system further includes a flow dividing device 60, and one ends of the first to nth branches are connected to the heat exchange member 30 through the flow dividing device.

The bypass device is arranged to realize parallel connection of the first to nth branches, so that the refrigerant flowing out of the heat exchange member 30 flows into the first to nth branches after being distributed by the bypass device.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the 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 (10)

1. An air conditioning system, comprising:

a compressor;

a heat exchange member;

a multistage heat exchanger including first to Nth heat exchangers;

the first to the Nth branches are respectively provided with a first to an Nth throttling device;

the compressor, the heat exchange piece and the multistage heat exchanger are sequentially connected, wherein the heat exchange piece is connected with the multistage heat exchanger through the first to the Nth branches, one ends of the first to the Nth branches are connected with the heat exchange piece, the other ends of the first to the Nth branches are respectively connected with a first refrigerant inlet and outlet of the first to the Nth heat exchangers, a second refrigerant inlet and outlet of the first to the Nth heat exchangers are connected with the compressor, and N is an integer greater than or equal to 2.

2. The air conditioning system of claim 1,

the second refrigerant inlets and outlets of the first to the N-1 heat exchangers are respectively connected with the first refrigerant inlets and outlets of the second to the N heat exchangers.

3. The air conditioning system of claim 2,

and a second refrigerant inlet and outlet of the Nth heat exchanger is directly connected with the compressor, and second refrigerant inlets and outlets of the first to N-1 th heat exchangers are connected with the compressor through a second refrigerant inlet and outlet of the Nth heat exchanger.

4. The air conditioning system of claim 1,

the first to nth heat exchangers are arranged in sequence along the flowing direction of air.

5. The air conditioning system of any one of claims 1 to 4, further comprising:

the controller is connected with the first throttling device to the Nth throttling device, responds to a constant humidity cooling instruction, controls the air conditioning system to operate a constant humidity cooling mode, controls the first throttling device to the ith throttling device to be opened, controls the ith throttling device to be closed, controls the evaporation temperature of the first heat exchanger to the ith heat exchanger to be higher than the dew point temperature, and sequentially reduces the evaporation temperature of the first heat exchanger to the ith heat exchanger, wherein i is an integer which is more than or equal to 1 and less than or equal to N.

6. The air conditioning system of any one of claims 1 to 4, further comprising:

and the controller is connected with the first to Nth throttling devices, responds to a constant-temperature dehumidification instruction, controls the air-conditioning system to operate a constant-temperature dehumidification mode, controls the first to Nth throttling devices to be opened, controls the Nth throttling device to be completely opened, controls the evaporation temperature of the first heat exchanger to be equal to the dew point temperature, and controls the evaporation temperature of the second to Nth heat exchangers to be sequentially reduced and lower than the dew point temperature.

7. The air conditioning system of any one of claims 1 to 4, further comprising:

the controller is connected with the first to the Nth throttling devices, responds to an energy-efficient cooling and dehumidifying instruction, controls the air conditioning system to operate a high-energy-efficient cooling and dehumidifying mode, controls the first to the Nth throttling devices to be opened, sequentially reduces the evaporating temperatures of the first to the Nth heat exchangers, and ensures that the absolute value of the difference between the evaporating temperature TI of the I heat exchanger and the dew point temperature is smaller than or equal to a preset difference, the evaporating temperatures of the first to the I-1 heat exchangers are larger than the dew point temperature, and the evaporating temperatures of the I +1 to the Nth heat exchangers are smaller than the dew point temperature, wherein I is an integer larger than 1 and smaller than N, and N is an integer larger than or equal to 3.

8. The air conditioning system of claim 7, wherein the controller is further configured to:

responding to a high-energy-efficiency cooling and dehumidifying instruction, and if the indoor humidity is larger than a preset humidity range, controlling the air conditioning system to operate a constant-temperature dehumidifying mode by the controller until the indoor humidity is in the preset humidity range;

responding to the high-energy-efficiency cooling and dehumidifying instruction, and if the indoor humidity is within the preset humidity range, controlling the air conditioning system to operate the high-energy-efficiency cooling and dehumidifying mode by the controller.

9. The air conditioning system as claimed in any one of claims 1 to 4, further comprising:

and the controller is connected with the first throttling device, the second throttling device, the Nth throttling device and the Nth throttling device, responds to a heating instruction, controls the air-conditioning system to operate in a heating mode, controls the first throttling device to be opened, controls the second throttling device, the Nth throttling device and the Nth throttling device to be closed, and controls the refrigerant flowing out of the compressor to flow into the heat exchange piece from the first throttling device after sequentially passing through the Nth throttling device and the first heat exchanger.

10. The air conditioning system as claimed in any one of claims 1 to 4, further comprising:

and the one ends of the first to Nth branches are connected with the heat exchange piece through the flow dividing device.

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