CN221005265U - Heat exchange system and air conditioner - Google Patents

Abstract

The application relates to the technical field of air conditioners and discloses a heat exchange system which comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve, a first indoor heat exchanger, a first refrigerant circulation flow path, a second indoor heat exchanger, a first three-way valve and a compressor air suction port, wherein the first refrigerant circulation flow path is connected with the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger and the first three-way valve; the supercooling branch comprises a supercooling heat exchanger for supercooling a pipeline between the outdoor heat exchanger and the first indoor heat exchanger; and the liquid storage branch comprises a liquid storage tank, a liquid storage inlet pipeline and a liquid storage outlet pipeline, the liquid storage tank is provided with a liquid storage inlet and a liquid storage outlet, one end of the liquid storage inlet pipeline is communicated with the liquid storage inlet, and the other end of the liquid storage inlet pipeline is communicated between the supercooling heat exchanger and the first indoor communication pipeline. The heat exchange system disclosed by the application can realize reheating and dehumidification. The application also discloses an air conditioner.

Description

Heat exchange system and air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to a heat exchange system and an air conditioner.

Background

Currently, the operation modes of the air conditioner generally include a cooling mode, a heating mode, a dehumidifying mode, and the like. However, with the improvement of the living standard of people, the functional demands of users on the air conditioner are increasing.

For example, in the dehumidifying mode of the conventional air conditioner, it is generally required to lower the evaporation temperature to a temperature lower than the return dew point temperature and to have a large difference between them so as to exert the dehumidifying effect.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

When the indoor environment humidity of the user is high, the air conditioner is generally controlled to operate in a dehumidification mode so as to adjust the indoor environment humidity of the user. However, when the air conditioner is operated in a dehumidification mode, the indoor heat exchanger of the air conditioner serves as an evaporator, i.e., while dehumidification is performed, the indoor ambient temperature of the user is lowered. For example, in the late summer season, people have little demand for indoor temperature reduction due to low indoor environment temperature, but sometimes the environment humidity is large, at this time, the user needs to adjust the indoor environment humidity without adjusting the environment temperature, but the existing air conditioner cannot independently control the temperature and the humidity when operating the dehumidification mode.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of 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 as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a heat exchange system, including compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and first indoor heat exchanger, still include: a second indoor heat exchanger; the first indoor communication pipeline is arranged between the first indoor heat exchanger and the second indoor heat exchanger and is provided with a first indoor expansion valve; the first three-way valve is respectively communicated with the second indoor heat exchanger, the air outlet of the compressor and the air suction port, so that the heat exchange system forms a first refrigerant circulation flow path which is connected with the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the first three-way valve and the air suction port of the compressor; the supercooling branch comprises a supercooling heat exchanger for supercooling a pipeline between the outdoor heat exchanger and the first indoor heat exchanger; and the liquid storage branch comprises a liquid storage tank, a liquid storage inlet pipeline and a liquid storage outlet pipeline, the liquid storage tank is provided with a liquid storage inlet and a liquid storage outlet, one end of the liquid storage inlet pipeline is communicated with the liquid storage inlet, and the other end of the liquid storage inlet pipeline is communicated between the supercooling heat exchanger and the first indoor communication pipeline.

In some alternative embodiments, one end of the liquid storage outlet pipeline is communicated with the liquid storage outlet, and the other end of the liquid storage outlet pipeline is communicated with the air suction port of the compressor through the second three-way valve after passing through the cold heat exchanger.

In some alternative embodiments, the compressor includes a first suction port and a second suction port, wherein the first suction port communicates with the second three-way valve through a first suction line and the second suction port communicates with the first three-way valve through a second suction line.

In some alternative embodiments, the heat exchange system further comprises: the valve body is communicated with the pipeline between the second three-way valve and the second air suction pipeline.

In some alternative embodiments, the heat exchange system further comprises: the first liquid storage expansion valve is arranged on the liquid storage inlet pipeline; and the second liquid storage expansion valve is arranged on the liquid storage outlet pipeline.

In some alternative embodiments, the first indoor heat exchanger is disposed adjacent to the second indoor heat exchanger.

In some alternative embodiments, the first indoor expansion valve is disposed proximate to the first indoor heat exchanger, the heat exchange system further comprising: the second indoor expansion valve is arranged on the first indoor communication pipeline and is close to the second indoor heat exchanger.

In some alternative embodiments, the heat exchange system further comprises: and the second indoor communication pipeline is provided with a third indoor expansion valve close to the third indoor heat exchanger and a fourth indoor expansion valve close to the fourth indoor heat exchanger.

In some alternative embodiments, the heat exchange system further comprises: the four-way communication pipeline is used for communicating the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger, and the four-way communication pipeline is provided with a first refrigerant port and a second refrigerant port which are respectively communicated with the first indoor heat exchanger and the third indoor heat exchanger.

The embodiment of the disclosure also provides an air conditioner, which comprises the heat exchange system.

The heat exchange system and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

The heat exchange system provided by the embodiment of the disclosure comprises a compressor, a four-way valve, an outdoor heat exchanger and a first indoor heat exchanger, and further comprises a second indoor heat exchanger, a first three-way valve and a first indoor communication pipeline for communicating the first indoor heat exchanger with the second indoor heat exchanger. The heat exchange system provided by the embodiment of the disclosure can form a first refrigerant circulation flow path connected by the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the first three-way valve and the air suction port of the compressor.

When the first indoor heat exchanger and the second indoor heat exchanger are positioned in the same room or the same indoor unit, the second indoor heat exchanger in the first refrigerant circulation flow path can serve as an evaporator to play a dehumidification function, and further, the first indoor heat exchanger serves as a condenser to compensate for the reduction of the temperature of the second indoor heat exchanger when dehumidification is performed, namely, the second indoor heat exchanger dehumidifies and the air with the reduced temperature is reheated, namely, reheat dehumidification is realized.

The first refrigerant circulation flow path provided by the embodiment of the disclosure can realize reheat dehumidification, namely, the indoor environment is dehumidified, the temperature of the indoor environment is not influenced, and independent adjustment of the indoor temperature and humidity is realized.

Further, the heat exchange system provided by the embodiment of the disclosure further comprises a supercooling branch and a liquid storage branch. The supercooling branch can improve the supercooling degree of the refrigerant in the heat exchange system; the liquid storage branch can adjust the quantity of the refrigerant participating in circulation in the heat exchange system, for example, when the working condition changes or the indoor load changes, the liquid storage branch can adjust the quantity of the refrigerant participating in circulation in the heat exchange system, so that the quantity of the refrigerant in the heat exchange system accords with the current working condition, and the energy efficiency is further improved. And one end of a liquid storage inlet pipeline in the liquid storage branch is communicated with the liquid storage inlet, and the other end of the liquid storage inlet pipeline is communicated between the supercooling heat exchanger and the first indoor communication pipeline. That is, the heat exchange system provided by the embodiment of the disclosure can store the refrigerant before supercooling by adopting the liquid storage branch, so that the energy efficiency is further improved.

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 and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic diagram of a heat exchange system provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a refrigerant flow path for a heat exchange system operating in reheat dehumidification mode provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a refrigerant flow path for a heating mode of operation of a heat exchange system provided by an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a refrigerant flow path for cooling a portion of a room and heating a portion of the room in a heat exchange system according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a refrigerant flow path of a heat exchange system operating with partial room cooling and partial room reheat dehumidification provided in an embodiment of the present disclosure;

FIG. 9 is a schematic view of a refrigerant flow path of a heat exchange system operating with a portion of the room being heated and a portion of the room being reheated and dehumidified according to an embodiment of the present disclosure;

Fig. 10 is a schematic view of a refrigerant flow path of a heat exchange system according to an embodiment of the present disclosure.

Reference numerals:

1: a compressor; 11: a first air suction port; 12: a second air suction port; 13: an air outlet;

2: a four-way valve; 21: a four-way communication pipeline; 201: a first refrigerant port; 202: a second refrigerant port;

3: an outdoor heat exchanger; 301: an indoor and outdoor communication pipeline; 31: a first electronic expansion valve;

41: a first indoor heat exchanger; 411: a first indoor expansion valve; 42: a second indoor heat exchanger; 421: a second indoor expansion valve; 43: a third indoor heat exchanger; 431: a third indoor expansion valve; 44: a fourth indoor heat exchanger; 441: a fourth indoor expansion valve; 401: a first indoor communication pipeline; 402: a second indoor communication pipeline; 403: a third indoor communication pipeline;

51: a first three-way valve; 52: a second three-way valve; 511: the tee joint is communicated with the pipeline; 501: a third refrigerant port; 502: a fourth refrigerant port;

6: a liquid storage tank; 61: a first reservoir expansion valve; 62: a second reservoir expansion valve;

7: supercooling heat exchanger.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. 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 still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may 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. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

The embodiment of the disclosure provides a heat exchange system.

As shown in fig. 1, the heat exchange system provided in the embodiment of the present disclosure includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first indoor heat exchanger 41, a second indoor heat exchanger 42, a first indoor communication pipeline 401, and a first three-way valve 51. The first indoor communication pipe 401 is provided between the first indoor heat exchanger 41 and the second indoor heat exchanger 42, and the first indoor communication pipe 401 is provided with a first indoor expansion valve 411. The first three-way valve 51 is connected to the second indoor heat exchanger 42, the air outlet 13 of the compressor, and the air inlet, respectively, so that the heat exchange system forms a first refrigerant circulation path connected to the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first indoor expansion valve 411, the second indoor heat exchanger 42, the first three-way valve 51, and the air inlet of the compressor.

Further, the heat exchange system also comprises a supercooling branch and a liquid storage branch. The supercooling branch comprises a supercooling heat exchanger 7 for supercooling a pipeline between the outdoor heat exchanger and the first indoor heat exchanger; the liquid storage branch comprises a liquid storage tank 6, a liquid storage inlet pipeline and a liquid storage outlet pipeline, wherein the liquid storage tank 6 is provided with a liquid storage inlet and a liquid storage outlet, one end of the liquid storage inlet pipeline is communicated with the liquid storage inlet, and the other end of the liquid storage inlet pipeline is communicated between the supercooling heat exchanger 7 and the first indoor communication pipeline 401.

Alternatively, the compressor 1 includes a first suction port 11 and a second suction port 12. The heat exchange system provided by the embodiment of the present disclosure includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, and a first indoor heat exchanger 41. The first suction port 11 of the compressor communicates with the four-way valve 2. The three channels of the first three-way valve 51, which are communicated with each other, are respectively communicated with the second indoor heat exchanger 42, the air outlet 13 of the compressor and the second air suction port 12, so that the heat exchange system forms a first refrigerant circulation flow path connected by the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first indoor expansion valve 411, the second indoor heat exchanger 42, the first three-way valve 51 and the second air suction port 12.

Optionally, the first indoor heat exchanger 41 is disposed adjacent to the second indoor heat exchanger 42, for example, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 are disposed in the first indoor unit, and the first indoor heat exchanger 41 is close to an air outlet of the first indoor unit, and the second indoor heat exchanger 42 is close to an air inlet of the first indoor unit. The arrangement of the first refrigerant circulation flow path in the heat exchange system provided by the embodiment of the disclosure can enable the heat exchange system to operate in a reheat dehumidification mode. Referring to fig. 2, a refrigerant flow path of the heat exchange system operating the reheat dehumidification mode provided in the embodiment of the present disclosure is as follows:

When the heat exchange system runs and is used for reheating and dehumidifying, the four-way valve 2 is switched to a state that the D pipe is connected with the E pipe and the C pipe is connected with the S pipe. The high-temperature high-pressure gaseous refrigerant discharged from the air outlet 13 of the compressor enters the first indoor heat exchanger 41 through the four-way valve 2. The high-temperature and high-pressure refrigerant is cooled in the first indoor heat exchanger 41 and then is divided into two paths, one path enters the second indoor heat exchanger 42 for evaporation and heat absorption after being throttled by the first indoor expansion valve 411, and then returns to the second air suction port 12 of the compressor, namely a first refrigerant circulation flow path; the other path enters the outdoor heat exchanger 3 to exchange heat and then returns to the first air suction port 11 of the compressor.

In the first refrigerant circulation path, the second indoor heat exchanger 42 serves as an evaporator and is close to the air inlet of the first indoor unit, and the first indoor heat exchanger 41 serves as a condenser and is close to the air outlet of the first indoor unit. After the high-humidity air in the user room enters from the air inlet of the first indoor unit, the air is cooled and dehumidified through the second indoor heat exchanger 42 serving as an evaporator, and the cooled and dehumidified air is reheated and heated through the first indoor heat exchanger 41 serving as a condenser or a reheater. Namely, reheat dehumidification is achieved.

Further, the heat exchange system provided in the embodiment of the present disclosure further includes a supercooling branch and a liquid storage branch, as shown in fig. 1. The supercooling branch can improve the supercooling degree of the refrigerant in the heat exchange system; the liquid storage branch can adjust the quantity of the refrigerant participating in circulation in the heat exchange system, for example, when the working condition changes or the indoor load changes, the liquid storage branch can adjust the quantity of the refrigerant participating in circulation in the heat exchange system, so that the quantity of the refrigerant in the heat exchange system accords with the current working condition, and the energy efficiency is further improved.

Alternatively, one end of the liquid storage outlet pipeline is communicated with the liquid storage outlet, and the other end of the liquid storage outlet pipeline is communicated with the air suction port of the compressor through the second three-way valve 52 after passing through the cold heat exchanger 7.

Alternatively, the other end of the liquid storage outlet pipeline is communicated with the first air suction port 11 of the compressor through the second three-way valve 52 after passing through the supercooling heat exchanger 7. In this way, in the heat exchange system provided by the embodiment of the disclosure, the refrigerant before flowing through the cold heat exchanger 7 can be stored, and the refrigerant quantity entering the supercooling heat exchanger 7 can be regulated while the refrigerant quantity participating in circulation in the heat exchange system is regulated, so that the supercooling degree of the supercooling heat exchanger 7 is regulated.

Alternatively, the compressor includes a first suction port 11 and a second suction port 12, wherein the first suction port 11 communicates with the second three-way valve 52 through a first suction line, and the second suction port 12 communicates with the first three-way valve 51 through a second suction line. Further, the heat exchange system further comprises: the valve body communication line is communicated between the second three-way valve 52 and the second suction line.

For example, when the heat exchange system is operating in the heating mode, the refrigerant passing through the liquid storage branch may flow back to the compressor from the second suction port 12 through the valve body communication line between the second three-way valve 52 and the second suction line. As shown in fig. 6.

Optionally, the heat exchange system further comprises a first reservoir expansion valve 61 and a second reservoir expansion valve 62. As shown in fig. 1 and 2. The first liquid storage expansion valve 61 is disposed in the liquid storage inlet pipeline, and the second liquid storage expansion valve 62 is disposed in the liquid storage outlet pipeline. One end of the liquid storage outlet pipeline is communicated with the liquid storage outlet, and the other end of the liquid storage outlet pipeline is communicated with an air suction port of the compressor through a cold heat exchanger 7. Further, a second liquid-storage expansion valve 62 is provided between the liquid-storage outlet and the supercooling heat exchanger 7.

The operation refrigeration working condition of the air conditioner is taken as an example to describe the effect of the liquid storage branch on the refrigerant quantity adjustment of the heat exchange system. And (3) a process of storing the refrigerant: when the refrigerating condition is met, the refrigerant entering the first liquid storage expansion valve 61 is supercooled liquid, the refrigerant is throttled to the intermediate pressure through the first liquid storage expansion valve 61 and is changed into a two-phase state, the dryness of the two-phase state is controlled by the opening degree of the first liquid storage expansion valve 61, when the first liquid storage expansion valve 61 is fully opened, the dryness is 0, the dryness is continuously increased along with the reduction of the opening degree of the first liquid storage expansion valve 61, the proportion of the gaseous refrigerant and the liquid refrigerant entering the liquid storage tank 6 is changed, the liquid level in the liquid storage tank 6 is controlled, and the refrigerant is stored in the liquid storage tank 6 in a liquid state, so that the effect of controlling the circulation quantity of the refrigerant in a heat exchange system is achieved. And the liquid level of the liquid storage tank 6 can be further controlled by the opening degree of the second liquid storage expansion valve 62 through the connection of the second liquid storage expansion valve 62 with the bottom of the liquid storage tank 6. When the system reaches the optimal energy efficiency, the first liquid storage expansion valve 61 and the second liquid storage expansion valve 62 are closed simultaneously.

It will be appreciated that, as shown in fig. 3 to 10, when the heat exchange system further includes the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44, the refrigerant flow direction in the third indoor heat exchanger 43 is the same as the first indoor heat exchanger 41, and the refrigerant flow direction in the fourth indoor heat exchanger 44 is the same as the second indoor heat exchanger 42. That is, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 can reheat and dehumidify the indoor environment of the user, similarly to the first indoor heat exchanger 41 and the second indoor heat exchanger 42.

Alternatively, the first indoor expansion valve 411 is disposed close to the first indoor heat exchanger 41. The heat exchange system further includes a second indoor expansion valve 421. The second indoor expansion valve 421 is disposed in the first indoor communication line 401 and is disposed near the second indoor heat exchanger 42.

As described above, in the first refrigerant circulation flow path capable of performing reheat dehumidification, the opening degree of the first indoor expansion valve 411 can be controlled to adjust the refrigerant flow rate and pressure of the first indoor heat exchanger 41 serving as a reheater, thereby controlling the amount of reheat of the air after cooling and dehumidification. Further, the opening degree of the second indoor expansion valve 421 can be controlled to adjust the flow rate and pressure of the refrigerant in the second indoor heat exchanger 42 as an evaporator, thereby controlling the amount of dehumidification of the indoor high humidity air.

The embodiment of the disclosure further provides a method for adjusting the refrigerant circulation volume of a heat exchange system, comprising the following steps:

Step 1: acquiring the discharge pressure Pd of the compressor and the outdoor environment temperature Ta;

Step 2: setting an outdoor unit fan rotating speed R_out as a target rotating speed R_out ', setting an indoor fan rotating speed R_in as a target rotating speed R_in ', and setting a compressor frequency N as a target frequency N ';

Step 3: judging the running state of the heat exchange system until the heat exchange system runs stably, wherein the judging basis of the running stability of the heat exchange system is as follows: if the exhaust pressure of the compressor at the later moment (n+1) is equal to the exhaust pressure of the compressor at the current moment (n), namely P (n+1) =P (n), judging that the heat exchange system is stable in operation;

Step 4: if pd=pd', the refrigerant quantity is proper and no adjustment is needed; if Pd is more than Pd', the refrigerant quantity is excessive, and the refrigerant is required to be stored; if Pd is less than Pd', the refrigerant quantity is too small, and the refrigerant needs to be released; pd' is the saturation pressure corresponding to the refrigerant at the temperature of (Ta+10).

The method for storing the refrigerant in the liquid storage tank is that the second liquid storage expansion valve 62 is controlled to be opened, and the first liquid storage expansion valve 61 is closed until Pd is reduced to Pd'; the method for releasing the refrigerant in the liquid storage tank comprises the following steps: the first stock solution expansion valve 61 is controlled to open and the second stock solution expansion valve 62 is closed until Pd rises to Pd'.

The heat exchange system provided in the embodiment of the present disclosure further includes an indoor and outdoor communication pipeline 301. The first port of the indoor communication pipe is connected to the outdoor heat exchanger 3, the second port is connected to the pipe between the first indoor expansion valve 411 and the second indoor expansion valve 421, and the indoor and outdoor communication pipe 301 is provided with the first electronic expansion valve 31, so that the heat exchange system forms a second refrigerant circulation flow path connected by the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first electronic expansion valve 31, the outdoor heat exchanger 3, the first air inlet 11.

As described above, when the heat exchange system operates in the reheat dehumidification mode, the four-way valve 2 is switched to a state in which the D pipe is connected to the E pipe, the C pipe is connected to the S pipe, and the high-temperature and high-pressure refrigerant is cooled in the first indoor heat exchanger 41 and then is split into two paths, one path is throttled by the first indoor expansion valve 411 and then enters the second indoor heat exchanger 42 to perform reheat dehumidification, namely, the first refrigerant circulation path; the other path enters the outdoor heat exchanger 3 to exchange heat and then returns to the first air suction port 11 of the compressor, namely the second refrigerant circulation flow path. Thus, the amount of refrigerant flowing into the first refrigerant circulation passage can be controlled to adjust the reheat dehumidification amount. For example, when constant temperature dehumidification is required, the first refrigerant circulation passage requires a smaller amount of refrigerant, and at this time, other refrigerants may be returned to the compressor 1 through the second refrigerant circulation passage.

The heat exchange system provided by the embodiment of the disclosure further includes a third indoor heat exchanger 43 and a fourth indoor heat exchanger 44 that are adjacently disposed, wherein a second indoor communication pipeline 402 is disposed between the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44, and the second indoor communication pipeline 402 is provided with a third indoor expansion valve 431 close to the third indoor heat exchanger 43 and a fourth indoor expansion valve 441 close to the fourth indoor heat exchanger 44. The heat exchange system further includes a third indoor communication line 403 that communicates between the first indoor communication line 401 and the second indoor communication line 402, and the third indoor communication line 403 communicates with the indoor and outdoor communication lines 301.

Optionally, the third indoor heat exchanger 43 is in communication with the four-way valve 2, and the fourth indoor heat exchanger 44 is in communication with the first three-way valve 51. Alternatively, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 are provided in the second indoor unit, for example, the first indoor unit may be provided in a first room of the user, and the second indoor unit may be provided in a second room of the user.

Optionally, the heat exchange system further comprises a four-way communication line 21, as shown in fig. 5.

The four-way communication pipeline 21 is used for communicating the four-way valve 2, the first indoor heat exchanger 41 and the third indoor heat exchanger 43, wherein the four-way communication pipeline 21 is provided with a first refrigerant port 201 and a second refrigerant port 202 which are respectively communicated with the first indoor heat exchanger 41 and the third indoor heat exchanger 43.

In this way, the high-temperature and high-pressure refrigerant discharged from the compressor 1 can flow into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 through the four-way valve 2, respectively, or the refrigerant flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 can flow back to the compressor 1 through the four-way valve 2.

For example, in the operation mode that all rooms are heated simultaneously, the four-way communication pipeline 21 can be used for enabling the high-temperature and high-pressure refrigerant discharged by the compressor 1 to flow into the first indoor heat exchanger 41 through the first refrigerant port 201 and flow into the third indoor heat exchanger 43 through the second refrigerant port 202 after passing through the four-way valve 2; or in the mode that all rooms are simultaneously cooled, the refrigerants flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 flow back to the compressor 1 through the first refrigerant port 201 and the second refrigerant port 202, respectively.

Optionally, the heat exchange system further comprises a three-way communication line 511, as shown in fig. 5.

The three-way communication pipe 511 is used to communicate the first three-way valve 51, the second indoor heat exchanger 42, and the fourth indoor heat exchanger 44. Wherein, the three-way communication pipeline 511 is provided with a third refrigerant port 501 and a fourth refrigerant port 502 which are respectively communicated with the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44.

In this way, the high-temperature and high-pressure refrigerant discharged from the compressor 1 can be flowed into the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 through the first three-way valve 51, respectively, or the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 can be flowed back into the second suction port 12 of the compressor through the first three-way valve 51.

The heat exchange system provided by the embodiment of the disclosure can operate modes of partial room cooling and partial room heating, such as first room cooling and second room heating, as shown in fig. 7.

When the heat exchange system performs the simultaneous operation of cooling and heating, the four-way valve 2 is switched to a state that the D pipe is connected with the E pipe, the C pipe is connected with the S pipe, and the first indoor heat exchanger 41 and the fourth indoor heat exchanger 44 are controlled to be in a closed state. The high-temperature high-pressure gaseous refrigerant discharged from the air outlet 13 of the compressor enters the third indoor heat exchanger 43 through the four-way valve 2, at this time, the third indoor heat exchanger 43 serves as a condenser to heat the second room, then the refrigerant is throttled by the third indoor expansion valve 431 and then is divided into two paths, one path enters the second indoor heat exchanger 42 to exchange heat, at this time, the second indoor heat exchanger 42 serves as an evaporator to refrigerate the first room, and then flows back to the second air suction port 12 of the compressor through the first three-way valve 51; the other path of the air flows back to the first air suction port 11 of the compressor through the four-way valve 2 after entering the outdoor heat exchanger 3 for heat exchange. Namely, the heat exchange system realizes the functions of refrigerating part of rooms and heating part of rooms.

The heat exchange system provided by the embodiment of the disclosure can operate modes of partial room refrigeration and partial room reheating and dehumidification, such as first room refrigeration and second room reheating and dehumidification, as shown in fig. 8.

The four-way valve 2 is switched to a state in which the D pipe is connected to the E pipe and the C pipe is connected to the S pipe, and controls the first indoor heat exchanger 41 to be in a closed state. The high-temperature and high-pressure refrigerant discharged from the air outlet 13 of the compressor enters the third indoor heat exchanger 43 through the four-way valve 2, the heat exchange is completed, the refrigerant is throttled by the third indoor expansion valve 431 and then is divided into two paths, one path of refrigerant enters the second indoor heat exchanger 42 positioned in the first room and the fourth indoor heat exchanger 44 positioned in the second room after being split, at the moment, the second indoor heat exchanger 42 serves as an evaporator to play a refrigerating function on the first room, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 play a reheating and dehumidifying function on the second room, and then the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 flows back to the second air suction port 12 of the compressor through the first three-way valve 51; the other path of the air flows back to the first air suction port 11 of the compressor through the four-way valve 2 after entering the outdoor heat exchanger 3 for heat exchange. Namely, the heat exchange system realizes the functions of refrigerating part of rooms and reheating and dehumidifying part of rooms.

The heat exchange system provided by the embodiment of the disclosure can operate modes of heating a part of rooms and reheating and dehumidifying a part of rooms, such as heating a first room and reheating and dehumidifying a second room, as shown in fig. 9.

The four-way valve 2 is switched to a state that the D pipe is connected with the E pipe, the C pipe is connected with the S pipe, and the second indoor heat exchanger 42 is controlled to be in a closed state. The high-temperature and high-pressure refrigerant discharged from the air outlet 13 of the compressor flows into the first indoor heat exchanger 41 positioned in the first room and the third indoor heat exchanger 43 positioned in the second room through the four-way valve 2 respectively, and at this time, the first indoor heat exchanger 41 serves as a condenser for heating the first room because the second indoor heat exchanger 42 of the first room is in a closed state; then, the refrigerant is split into two paths, one path flows into the fourth indoor heat exchanger 44 for heat exchange, and then flows back to the second air suction port 12 of the compressor through the first three-way valve 51, at this time, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 reheat and dehumidify the second room, and the other path flows into the outdoor heat exchanger 3 for heat exchange, and then flows back to the first air suction port 11 of the compressor through the four-way valve 2. Namely, the heat exchange system realizes the functions of heating part of rooms and reheating and dehumidifying part of rooms.

The heat exchange system provided by the embodiments of the present disclosure may operate in a non-shutdown defrost mode, as shown in fig. 10.

The four-way valve 2 is switched to a state that the C pipe is connected with the D pipe and the S pipe is connected with the E pipe. The high-temperature high-pressure refrigerant discharged from the air outlet 13 of the compressor is divided into two paths, one path enters the outdoor heat exchanger 3 through the four-way valve 2 to exchange heat, and then flows into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 after being throttled by the first electronic expansion valve 31; the other path enters the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 through the first three-way valve 51 to exchange heat, and then flows into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively. After that, the refrigerant in the first indoor heat exchanger 41 and the third indoor heat exchanger 43 flows back to the first suction port 11 of the compressor through the four-way valve 2.

In this way, when defrosting the outdoor heat exchanger 3, the first indoor heat exchanger 41 of the first room serves as an evaporator, and the second indoor heat exchanger 42 serves as a condenser, which are compensated for each other, that is, the temperature of the first room is not lowered during defrosting; similarly, the third indoor heat exchanger 43 of the second room serves as an evaporator, while the fourth indoor heat exchanger 44 serves as a condenser, both of which compensate each other, i.e., do not reduce the temperature of the second room during defrosting.

It can be understood that, in the operation modes of the first room and the second room, such as simultaneous cooling, simultaneous heating of the first room and the second room, partial cooling of the room, partial heating of the room, reheat dehumidification, partial cooling of the room, partial reheat dehumidification, partial heating of the room, and partial reheat dehumidification, the supercooling degree of the refrigerant in the second refrigerant circulation flow path can be adjusted through the supercooling branch, or the quantity of the refrigerant participating in circulation in the heat exchange system can be adjusted through the liquid storage branch.

The application also provides an air conditioner comprising the heat exchange system of any one of the above.

It is understood that the heat exchange system may be a refrigerant circulation heat exchange system in an air conditioner. The air conditioner provided by the embodiment of the disclosure comprises the heat exchange system of the refrigerant circulation system in the form, and further comprises an indoor unit shell and an indoor fan arranged in the indoor unit shell; an outdoor unit casing and structural members of other air conditioners such as an outdoor fan provided in the outdoor unit casing.

The air conditioner comprising the heat exchange system provided by the embodiment of the disclosure can respectively meet different requirements of users, such as: all rooms are simultaneously refrigerated, all rooms are simultaneously heated, part of rooms are refrigerated and part of rooms are heated, reheat dehumidification is performed, part of rooms are refrigerated and part of rooms are reheat dehumidification is performed, part of rooms are heated and part of rooms are reheat dehumidification is performed, and the operation modes such as no shutdown defrosting and the like are performed, so that the diversified demands of users on the air conditioner are met.

Further, it can be understood that the air conditioner provided by the embodiment of the disclosure can realize reheat dehumidification, that is, temperature and humidity independent control, and can realize heating dehumidification, cooling dehumidification, constant temperature dehumidification and the like in the dehumidification process, and simultaneously, can also control the adjustment quantity of humidity, thereby improving the comfort level of a user in the use process of the air conditioner.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only 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. The utility model provides a heat transfer system, includes compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and first indoor heat exchanger, its characterized in that still includes:

a second indoor heat exchanger;

The first indoor communication pipeline is arranged between the first indoor heat exchanger and the second indoor heat exchanger and is provided with a first indoor expansion valve;

the first three-way valve is respectively communicated with the second indoor heat exchanger, the air outlet of the compressor and the air suction port, so that the heat exchange system forms a first refrigerant circulation flow path which is connected with the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the first three-way valve and the air suction port of the compressor;

the supercooling branch comprises a supercooling heat exchanger for supercooling a pipeline between the outdoor heat exchanger and the first indoor heat exchanger; and, a step of, in the first embodiment,

A liquid storage branch comprising a liquid storage tank, a liquid storage inlet pipeline and a liquid storage outlet pipeline, wherein the liquid storage tank is provided with a liquid storage inlet and a liquid storage outlet,

One end of the liquid storage inlet pipeline is communicated with the liquid storage inlet, and the other end of the liquid storage inlet pipeline is communicated between the supercooling heat exchanger and the first indoor communication pipeline.

2. The heat exchange system of claim 1, wherein the heat exchange system comprises a heat exchanger,

One end of the liquid storage outlet pipeline is communicated with the liquid storage outlet, and the other end of the liquid storage outlet pipeline is communicated with the air suction port of the compressor through the second three-way valve after passing through the cold heat exchanger.

3. A heat exchange system according to claim 2, wherein,

The compressor includes a first suction port and a second suction port, wherein,

The first air suction port is communicated with the second three-way valve through a first air suction pipeline, and the second air suction port is communicated with the first three-way valve through a second air suction pipeline.

4. A heat exchange system according to claim 3, further comprising:

the valve body is communicated with the pipeline between the second three-way valve and the second air suction pipeline.

5. The heat exchange system of claim 1, further comprising:

the first liquid storage expansion valve is arranged on the liquid storage inlet pipeline; and, a step of, in the first embodiment,

The second liquid storage expansion valve is arranged on the liquid storage outlet pipeline.

6. A heat exchange system according to any one of claims 1 to 5 wherein,

The first indoor heat exchanger is arranged adjacent to the second indoor heat exchanger.

7. The heat exchange system of claim 6, wherein the heat exchange system comprises a heat exchanger,

The first indoor expansion valve is disposed adjacent to the first indoor heat exchanger,

The heat exchange system further comprises:

The second indoor expansion valve is arranged on the first indoor communication pipeline and is close to the second indoor heat exchanger.

8. The heat exchange system of claim 7, further comprising:

A third indoor heat exchanger and a fourth indoor heat exchanger which are adjacently arranged, wherein,

A second indoor communication pipeline is arranged between the third indoor heat exchanger and the fourth indoor heat exchanger, and the second indoor communication pipeline is provided with a third indoor expansion valve close to the third indoor heat exchanger and a fourth indoor expansion valve close to the fourth indoor heat exchanger.

9. The heat exchange system of claim 8, further comprising:

the four-way communication pipeline is used for communicating the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger,

The four-way communication pipeline is provided with a first refrigerant port and a second refrigerant port which are respectively communicated with the first indoor heat exchanger and the third indoor heat exchanger.

10. An air conditioner comprising a heat exchange system as claimed in any one of claims 1 to 9.