CN218523664U

CN218523664U - Air conditioner

Info

Publication number: CN218523664U
Application number: CN202222184594.9U
Authority: CN
Inventors: 沈英焱; 罗建文; 张心沛
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2023-02-24
Anticipated expiration: 2032-08-18

Abstract

The application relates to the technical field of noise reduction of air conditioners and discloses an air conditioner, comprising: an indoor unit; the outdoor unit is connected with the indoor unit through a first pipeline and a second pipeline to form a refrigerant circulation loop; the outdoor valve box is arranged outside the room; the outdoor valve box includes: the supercooling heat exchanger is used for accommodating part of pipe sections of the first pipeline; the first throttling element is arranged on the first pipeline; the first end of the heat exchange branch is connected to a part of pipe section of the first pipeline between the supercooling heat exchanger and the first throttling element, the second end of the heat exchange branch is connected to a pipe section of the second pipeline, and the part of pipe section of the heat exchange branch is arranged in the supercooling heat exchanger to exchange heat with the part of pipe section of the first pipeline in the supercooling heat exchanger; and the second throttling element is arranged on the heat exchange branch. The noise and the refrigerant abnormal sound of expansion valve structure in the air conditioning unit operation process can be effectively reduced, the reliability of air conditioning unit operation can also be improved simultaneously, and then the travelling comfort of user's use is improved.

Description

Air conditioner

Technical Field

The application relates to the technical field of noise reduction of air conditioners, for example to an air conditioner.

Background

At present, with the improvement of the quality of life of people, the requirements on air conditioners closely related to daily life are higher and higher, wherein noise is one of important influencing factors influencing the use experience of users. In the operation process of the air conditioner, the indoor unit and the outdoor unit generate noises with different degrees, for example, in a refrigeration mode, when the heat exchange effect of the outdoor unit is not good, a phenomenon of refrigerant flash may occur, and further, the noise of the indoor unit is too high.

In order to reduce noise, the opening of the expansion valve is usually adjusted, damping parts or materials are added, and the expansion valve is subjected to physical noise reduction, so as to reduce or weaken noise of the air conditioning unit in the operation or standby process. Still provide an air conditioner among the correlation technique, including indoor set, off-premises station, trachea way, liquid pipeline, cooling branch and subcooling heat exchanger, still including being located the first check valve on the trachea way and the second check valve on the cooling branch, the both ends of cooling branch link to each other with the trachea way respectively and its tie point is located the both sides of first check valve respectively to partly setting of cooling branch is in the subcooling heat exchanger, and partly setting of liquid pipeline is in the subcooling heat exchanger, in order to carry out the heat transfer. Can solve effective slow refrigerant flash and the indoor noise problem that arouses to a certain extent, promote the travelling comfort and experience and feel.

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:

although the noise can be reduced to a certain degree by adopting the mode, the noise source can not be effectively isolated or cut off; in addition, in actual operation, due to factors such as pressure drop in the pipeline, refrigerant charge amount and the like, the state of the refrigerant changes, and the refrigerant cannot be effectively adjusted and controlled, so that noise is generated at the expansion valve, the heat exchanger, the pipeline of the heat exchanger and the like, and the operation reliability of the air conditioning unit is possibly influenced.

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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides an air conditioner, which can effectively reduce the noise and the refrigerant abnormal sound of an expansion valve structure in the operation process of an air conditioning unit, and can also improve the operation reliability of the air conditioning unit, thereby improving the comfort of users.

The air conditioner includes: an indoor unit; the outdoor unit is connected with the indoor unit through a first pipeline and a second pipeline to form a refrigerant circulation loop; the outdoor valve box is arranged outside the room; the outdoor valve box includes: the supercooling heat exchanger is used for accommodating part of pipe sections of the first pipeline; the first throttling element is arranged on the first pipeline; the first end of the heat exchange branch is connected to a part of pipe section of the first pipeline between the supercooling heat exchanger and the first throttling element, the second end of the heat exchange branch is connected to a pipe section of the second pipeline, and the part of pipe section of the heat exchange branch is arranged in the supercooling heat exchanger to exchange heat with the part of pipe section of the first pipeline in the supercooling heat exchanger; and the second throttling element is arranged on the heat exchange branch.

In some embodiments, the second throttling element comprises: and the electronic expansion valve is arranged on the heat exchange branch and is positioned at a first branch pipeline section of the heat exchange branch between the supercooling heat exchanger and the first pipeline.

In some embodiments, the second throttling element comprises: the capillary tube is arranged on the heat exchange branch and is positioned at a first part branch pipeline section of the heat exchange branch between the supercooling heat exchanger and the first pipeline; and the one-way valve is arranged on the heat exchange branch and is positioned on the second part of the branch pipe section of the heat exchange branch between the supercooling heat exchanger and the second pipeline.

In some embodiments, the outdoor valve box further comprises: and the first filter group comprises two or more first filters, and the first filters are arranged on the first pipeline and/or the heat exchange branch.

In some embodiments, the first filter group comprises two first filters, both of which are disposed in the first pipeline, one first filter being located in a section of the pipeline between the first end of the heat exchange branch and the subcooling heat exchanger, on a first side of the first throttling element, and the other first filter being located on a second side of the first throttling element; or,

the first filter group comprises three first filters, two first filters are arranged on the first pipeline, and one first filter is arranged on the heat exchange branch; wherein, on the first pipeline, one first filter is positioned in the pipeline section between the first end of the heat exchange branch and the supercooling heat exchanger, and the other first filter is positioned on the second side of the first throttling element; on the heat exchange branch, the first filter is positioned at the liquid outlet side of the second throttling element; or,

the first filter group comprises four first filters, two first filters are arranged on the first pipeline and are respectively positioned on two sides of the first throttling element, and the other two first filters are arranged on the heat exchange branch and are respectively positioned on two sides of the second throttling element.

In some embodiments, the outdoor valve box further comprises: and the valve box temperature sensor is arranged on the first pipeline to detect the refrigerant temperature of the first pipeline.

In some embodiments, the indoor unit comprises an indoor pipeline, and a liquid separation assembly and an indoor heat exchanger which are arranged on the indoor pipeline; the indoor set still includes:

and the indoor temperature sensor group is used for detecting the temperature of the indoor pipeline and the temperature of the indoor heat exchanger.

In some embodiments, the indoor temperature sensor group includes three indoor temperature sensors respectively disposed on a surface of the indoor heat exchanger, at a refrigerant inlet end, and at a refrigerant outlet line, so as to detect temperatures at corresponding positions.

In some embodiments, the outdoor unit includes an outdoor pipeline, and a compressor, an outdoor heat exchanger, and a third throttling element disposed on the outdoor pipeline, and second filters are disposed on two sides of the third throttling element, respectively, and the outdoor unit further includes:

and the outdoor temperature sensor group is used for detecting the temperature of the outdoor pipeline, the temperature of the outdoor heat exchanger and the outdoor temperature.

In some embodiments, the outdoor temperature sensor group includes four outdoor temperature sensors respectively disposed at a side surface of the outdoor unit, a surface of the outdoor heat exchanger, a discharge end and a return end of the compressor to detect temperatures at corresponding positions.

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

the indoor unit and the outdoor unit form a refrigerant circulation loop through a first pipeline and a second pipeline, an outdoor valve box is further arranged on the outdoor side, and a supercooling heat exchanger and a plurality of throttling elements are arranged in the outdoor valve box, so that the outdoor valve box can effectively isolate noise generated by the plurality of throttling elements in the outdoor valve box; part of pipe sections of the heat exchange branch are arranged in the supercooling heat exchanger, part of pipe sections of the first pipeline are arranged in the supercooling heat exchanger, and the two pipe sections can exchange heat in the supercooling heat exchanger, so that the refrigerant in the heat exchange branch is effectively gasified; meanwhile, the second throttling element is arranged on the heat exchange branch, so that the flow of the refrigerant flowing through the heat exchange branch and the circulating pressure of the refrigerant can be effectively controlled, the abnormal sound of the refrigerant in operation can be further weakened, and the operation reliability of the air conditioner and the use comfort of a user are 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 in the accompanying drawings, which correspond to the accompanying drawings, and which do not constitute a limitation on the embodiments, in which components having the same reference number designation are shown as similar components, and in which:

FIG. 1 is a first schematic structural diagram of an air conditioner according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure;

FIG. 3 is a third schematic structural view of an air conditioner according to an embodiment of the present disclosure;

FIG. 4 is a fourth schematic structural view of an air conditioner according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure;

fig. 6 is a first schematic diagram illustrating a flow direction of a refrigerant in the cooling mode of the air conditioner according to the embodiment of the disclosure;

fig. 7 is a schematic diagram illustrating a refrigerant flow direction of the air conditioner in the cooling mode according to the embodiment of the disclosure;

fig. 8 is a schematic view illustrating a refrigerant flow direction in the heating mode of the air conditioner according to the embodiment of the disclosure;

fig. 9 is a schematic diagram of controlling an opening of an electronic expansion valve in accordance with an embodiment of the disclosure.

Reference numerals:

10: an indoor unit; 11: an indoor heat exchanger; 12: a liquid separating component; 131: an indoor temperature sensor a;132: an indoor temperature sensor b;133: an indoor temperature sensor c;14: an indoor fan;

20: an outdoor unit; 21: a compressor; 22: a four-way valve; 23: an outdoor heat exchanger; 24: a third throttling element; 241: a second filter a;242: a second filter b;25: a gas-liquid separator; 261: an outdoor temperature sensor a;262: an outdoor temperature sensor b;263: an outdoor temperature sensor c;264: an outdoor temperature sensor d;

30: a first pipeline; 40: a second pipeline;

50: an outdoor valve box; 51: a supercooling heat exchanger; 52: a first throttling element; 53: a heat exchange branch; 54: a second throttling element; 541: an electronic expansion valve; 542: a capillary tube; 543: a one-way valve; 551: a first filter a;552: a first filter b;553: a first filter c;554: a first filter d;56: a valve box temperature sensor.

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 as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

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

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

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

The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.

Referring to fig. 1, an embodiment of the present disclosure provides an air conditioner, including: an indoor unit 10; an outdoor unit 20 connected to the indoor unit 10 through a first pipe 30 and a second pipe 40 to form a refrigerant circulation circuit; an outdoor valve box 50 provided outside the room; the outdoor valve box 50 includes therein: a supercooling heat exchanger 51, a part of the tube section of the first pipeline 30 is arranged in the supercooling heat exchanger 51; a first throttling element 52 disposed on the first conduit 30; a heat exchange branch 53 having a first end connected to a portion of the first pipeline 30 between the supercooling heat exchanger 51 and the first throttling element 52 and a second end connected to a portion of the second pipeline 40, wherein the portion of the heat exchange branch 53 is disposed in the supercooling heat exchanger 51 to exchange heat with the portion of the first pipeline 30 in the supercooling heat exchanger 51; and a second throttling element 54 is arranged on the heat exchange branch 53.

By adopting the air conditioner provided by the embodiment of the disclosure, the indoor unit 10 and the outdoor unit 20 form a refrigerant circulation loop through the first pipeline 30 and the second pipeline 40, the outdoor side is further provided with the outdoor valve box 50, and the supercooling heat exchanger 51 and a plurality of throttling elements are arranged in the outdoor valve box 50, so that the outdoor valve box 50 can effectively isolate the noise generated by the plurality of throttling elements therein; and part of pipe sections of the heat exchange branch 53 are arranged in the supercooling heat exchanger 51, part of pipe sections of the first pipeline 30 are arranged in the supercooling heat exchanger 51, two pipe sections can exchange heat in the supercooling heat exchanger 53, so that the refrigerant in the heat exchange branch 53 is effectively gasified, meanwhile, the second throttling element 54 is arranged on the heat exchange branch 53, the flow rate of the refrigerant flowing through the heat exchange branch 53 and the circulating pressure of the refrigerant can be effectively controlled, the abnormal sound of the refrigerant during operation can be further weakened, and the operation reliability of the air conditioner and the use comfort of a user are improved.

In this embodiment, the indoor unit 10 is disposed at an indoor side, and is configured to exchange heat with indoor air; the outdoor unit 20 is disposed outside the room to exchange heat with outdoor air. The indoor unit 10 and the outdoor unit 20 are connected to the indoor unit 10 through a first pipeline 30 and a second pipeline 40 to form a refrigerant circulation loop; wherein, the first pipeline 30 is flowed with liquid refrigerant, that is, the first pipeline 30 is a liquid pipe pipeline; gaseous refrigerant flows through the second pipeline 40, i.e., the second pipeline 40 is a gas pipe pipeline.

As shown in fig. 1 and 5, in some embodiments, the indoor unit 10 includes an indoor pipeline, and a liquid separation assembly 12 and an indoor heat exchanger 11 disposed on the indoor pipeline, and an indoor fan 14 is disposed near the indoor heat exchanger 11 to supply air to the indoor. Here, the indoor pipes of the indoor unit 10 are connected to the first pipe 30 and the second pipe 40 at two ends, and the liquid separating assembly 12 is located between the first throttling element 52 and the indoor heat exchanger 11 to prevent the problem of liquid separation unevenness of the indoor pipes.

In some embodiments, the indoor unit 10 further includes: and the indoor temperature sensor group is used for detecting the temperature of the indoor pipeline and the temperature of the indoor heat exchanger 11. In order to detect the temperature condition of the indoor heat exchanger 11 more comprehensively and accurately, in the present embodiment, the indoor temperature sensor group includes three indoor temperature sensors, namely an indoor temperature sensor a131, an indoor temperature sensor b132 and an indoor temperature sensor c133; accordingly, the indoor temperature sensor a131 is disposed on the surface of the indoor heat exchanger 11 to detect the surface temperature of the indoor heat exchanger 11 in real time; the indoor temperature sensor b132 is disposed at a refrigerant inlet end of the indoor heat exchanger 11 to detect a refrigerant inlet temperature of the indoor heat exchanger 11 in real time; the indoor temperature sensor c133 is disposed at the refrigerant outlet end of the indoor heat exchanger 11 to detect the refrigerant outlet temperature of the indoor heat exchanger 11 in real time.

As shown in fig. 1 and 5, in some embodiments, the outdoor unit 20 includes an outdoor pipeline, and a compressor 21, an outdoor heat exchanger 23, and a third throttling element 24 disposed on the outdoor pipeline, wherein a second filter is disposed on each of two sides of the third throttling element 24, and a four-way valve 22 and a gas-liquid separator 25 are disposed on the outdoor pipeline; here, both ends of the outdoor pipe in the outdoor unit 20 are connected to the first pipe 30 and the second pipe 40, respectively, and the third throttling element 24 is located between the outdoor heat exchanger 23 and the supercooling heat exchanger 51, and effectively controls the flow rate of the refrigerant flowing through the first pipe 30; meanwhile, a second filter a241 is disposed on one side of the third throttling element 24, and a second filter b242 is disposed on the other side of the third throttling element 24, so as to ensure smooth circulation of the refrigerant flowing through the third throttling element 24, so that normal operation of the air conditioner is not affected by blockage, and noise of the refrigerant generated by the third throttling element 24 can be further reduced.

In some embodiments, the outdoor unit 20 further includes: and an outdoor temperature sensor group for detecting the temperature of the outdoor pipeline, the temperature of the outdoor heat exchanger 23 and the outdoor temperature. In order to more fully and accurately detect the temperature condition of the outdoor unit 20 and the outdoor temperature condition, in the present embodiment, the outdoor temperature sensor group includes four outdoor temperature sensors, namely an outdoor temperature sensor a261, an outdoor temperature sensor b262, an outdoor temperature sensor c263 and an outdoor temperature sensor d264; accordingly, the outdoor temperature sensor a261 is disposed on the inner side or the outer side of the outdoor unit 20 to detect the outdoor ambient temperature in real time; an outdoor temperature sensor b262 is disposed on the surface of the outdoor unit 20 to detect the surface temperature of the outdoor heat exchanger 23 in real time; the outdoor temperature sensor c263 is disposed at the discharge end of the compressor 21 to detect the discharge temperature of the compressor 21 in real time; the outdoor temperature sensor d264 is disposed at the return end of the compressor 21 to detect the return temperature of the compressor 21 in real time.

In the above embodiments, the specific structures of the indoor unit 10 and the outdoor unit 20 are not particularly limited, and those skilled in the art can set the structures according to actual situations; for example, the outdoor unit 10 may include other structures besides the above structure, such as: capillary assemblies, one-way valves, and the like.

In the above-described embodiment, the specific types of the indoor heat exchanger 11 and the outdoor heat exchanger 23 are not particularly limited, and may be a plate heat exchanger, a double-tube heat exchanger, or a fin heat exchanger.

In case of the open-mounted indoor unit, the expansion valve structure is more likely to transmit noise indoors during operation. In the present embodiment, the outdoor valve box 50 is fixedly disposed at the outdoor side, and the expansion valve structure is disposed in the outdoor valve box 50 to effectively isolate noise generated by the expansion valve structure. Wherein, the outdoor valve box 50 includes a box body, an installation space is defined therein, and the supercooling heat exchanger 51 and the first throttling element 52 connected to the first pipe 30 are disposed in the installation space, and the heat exchange branch 53 connected to the first pipe 30 and the second pipe 40 and the second throttling element 54 disposed on the heat exchange branch 53 are disposed in the installation space.

Optionally, the box is wrapped internally or externally with sound insulation cotton to further prevent noise transmission.

Optionally, the supercooling heat exchanger 51 comprises a shell, a heat exchange cavity is defined in the shell, and a part of pipe sections of the heat exchange branch 53 and a part of pipe sections of the first pipeline 30 exchange heat in the heat exchange cavity of the supercooling heat exchanger 51; the supercooling heat exchanger 51 is filled with a heat exchange medium in a heat exchange cavity to improve the heat exchange efficiency through the heat exchange medium, and optionally, the heat exchange medium is water. The supercooling heat exchanger 51 can increase the supercooling degree of the refrigerant entering the first pipeline 30 and the superheating degree of the refrigerant entering the second pipeline 40, and can reduce the noise caused by the flash evaporation of the refrigerant.

Optionally, the heat exchange branch 53 and the first pipeline 30 in the heat exchange cavity of the supercooling heat exchanger 51 are arranged in a spiral manner, so as to further enhance the heat exchange effect. Of course, this is only one arrangement, and here, there is no limitation on the specific structure of the supercooling heat exchanger 51, and the skilled person can set it according to the actual situation.

As shown in fig. 4, in some embodiments, the outdoor valve box 50 further includes therein: the valve box temperature sensor 56 is disposed on the first pipeline 30 to detect a temperature of the refrigerant in the first pipeline 30. In order to more comprehensively and accurately detect the supercooling degree of the refrigerant in the first pipeline 30 of the outdoor valve box 50, the temperature of the refrigerant at the position needs to be accurately detected, and the supercooling degree of the refrigerant is obtained by the difference between the temperature of the refrigerant and the saturation temperature.

As shown in connection with FIG. 4, in some embodiments, the second throttling element 54 comprises: and an electronic expansion valve 541 disposed on the heat exchange branch 53 and located in a first part of the branch pipe section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the first pipe 30. So as to better adjust the flow rate of the refrigerant flowing through the cold heat exchanger 51 in the heat exchange branch 53, wherein the opening degree of the electronic expansion valve 541 can be controlled according to the obtained supercooling degree of the refrigerant.

In combination with the above embodiments, referring to fig. 9, an embodiment of the present disclosure further provides a method for controlling an opening degree of an electronic expansion valve, where the method includes:

under the condition of the refrigeration operation of the air conditioner, the liquid outlet temperature of the refrigerant of the first pipeline 30 in the outdoor valve box 50 and the return air temperature and the exhaust air temperature of the compressor 21 are obtained;

according to the temperature of the refrigerantThe degree, the return air temperature and the exhaust air temperature respectively calculate the supercooling degree T of the refrigerant liquid _in1 And the superheat degree T of return air _d And degree of superheat T of exhaust gas _sSH ；

According to the supercooling degree T of the discharged liquid _in1 And the degree of superheat T of the return air _d Or degree of superheat T of exhaust gas _sSH And controlling the opening of the electronic expansion valve.

In this embodiment, the opening degree of the electronic expansion valve is controlled by the above method, so that the refrigerant in the heat exchange branch 53 can be effectively gasified, and the suction dryness is increased, that is, the pressure of the refrigerant in the heat exchange circulation loop can be effectively balanced, and meanwhile, the exhaust temperature and the return air superheat degree of the compressor 21 can be effectively prevented from exceeding the operation protection range of the compressor 21, thereby ensuring the stability of the air conditioner.

In this embodiment, the supercooling degree T of the refrigerant outlet liquid _in1 The temperature of the discharged liquid and the saturation temperature of the detection position of the discharged liquid are calculated; superheat degree T of return air _d The air return temperature and the saturation temperature of the air return detection position are calculated; exhaust superheat degree T _sSH Is calculated from the exhaust temperature and the saturation temperature of the exhaust gas detection position.

In some embodiments, the degree of subcooling T is based on the effluent _in1 And the superheat degree T of return air _d Or degree of superheat T of exhaust gas _sSH Controlling the opening degree of the electronic expansion valve, comprising:

supercooling degree T of effluent liquid _in1 Temperature T greater than a first target constant ₁ And the degree of superheat T of the return air _d Greater than a second target constant temperature T ₂ Under the condition of (3), controlling the electronic expansion valve to close;

supercooling degree T of effluent liquid _in1 Temperature T greater than a first target constant ₁ And the degree of superheat T of the return air _d Less than or equal to a second target constant temperature T ₂ Under the condition of (3), the opening degree of the electronic expansion valve is controlled to be reduced until the liquid outlet supercooling degree T _in1 Equal to a first target constant temperature T ₁ 。

In some embodiments, the degree of supercooling T is determined according to the effluent liquid _in1 And the degree of superheat T of the return air _d Or degree of superheat T of exhaust gas _sSH Control of electricityThe opening degree of the sub-expansion valve includes:

supercooling degree T of the discharged liquid _in1 Less than or equal to a first target constant temperature T ₁ And the degree of superheat T of the exhaust gas _sSH Less than or equal to a third target constant temperature T ₃ Under the condition of (4), controlling the electronic expansion valve to close;

supercooling degree T of effluent liquid _in1 Less than or equal to a first target constant temperature T ₁ And the degree of superheat T of the exhaust gas _sSH Greater than a third target constant temperature T ₃ Under the condition of (3), the opening degree of the electronic expansion valve is controlled to be increased until the supercooling degree T of the discharged liquid _in1 Equal to a first target constant temperature T ₁ 。

Alternatively, in some embodiments, the electronic expansion valve is controlled to be closed in the case of the air conditioner heating operation.

Optionally, in some embodiments, to avoid the problem that the opening degree of the electronic expansion valve is adjusted and controlled continuously for multiple times, so that the components are frequently operated, thereby causing unstable operation of the air conditioner system. After the opening degree of the electronic expansion valve is adjusted, the method further comprises the following steps:

when the interval time for adjusting the electronic expansion valve is less than the set interval time t ₁ The current opening degree of the electronic expansion valve is maintained.

In the above method, the first target constant temperature T ₁ A second target constant temperature T ₂ Third target constant temperature T ₃ And setting the interval time t ₁ And the relevant target set values can be determined according to factors such as the configuration of the air conditioner, the use environment and the like.

As shown in connection with FIG. 2, in some embodiments, the second throttling element 54 comprises: a capillary tube 542 disposed on the heat exchange branch 53 and located at the first partial pipeline section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the first pipeline 30; and a check valve 543 arranged on the heat exchange branch 53 and located at the second part of the branch pipe section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the second pipe 40.

In this embodiment, the capillary tube 542 is disposed at the first part of the branch tube section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the first pipeline 30, so as to control the amount of the refrigerant flowing through the heat exchange branch 53, and the check valve 543 can limit the refrigerant flowing from the first part of the branch tube section of the heat exchange branch 53 to the second pipeline 40.

As shown in fig. 3, optionally, in the case where the second throttling element 54 includes an electronic expansion valve 541, a check valve 543 may be provided. The electronic expansion valve 541 is arranged on the heat exchange branch 53 and is located in a first part of the branch pipe section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the first pipeline 30; the check valve 543 is disposed on the heat exchange branch 53 and located in the second branch pipe section of the heat exchange branch 53 between the supercooling heat exchanger 51 and the second pipe 40.

In the above embodiment, the specific type and structure of the check valve 543 are not specifically limited, the check valve 543 may be a vertical check valve, a horizontal check valve, a swing check valve, a lift check valve, or a butterfly check valve, and those skilled in the art may set the check valve according to actual situations.

In some embodiments, the outdoor valve box 50 further includes therein: a first filter group comprising two or more first filters, which are arranged on the first pipe 30 and/or on the heat exchange branch 53. The refrigerant flowing through the first pipeline 30 and/or the heat exchange branch 53 can be ensured to smoothly circulate, and the normal operation of the air conditioner is not influenced by blockage. Specifically, as shown in fig. 2, the first filter group includes two first filters, namely a first filter a551 and a first filter b552. Wherein a first filter a551 and a first filter b552 are both disposed in the first conduit 30, the first filter a551 is located in the section between the first end of the heat exchange branch 53 and the subcooling heat exchanger 51, the section is the first filter a551 on the first side of the first throttling element 52, and the first filter b552 is located on the second side of the first throttling element 52.

As shown in fig. 3, the first filter group includes three first filters, i.e., a first filter a551, a first filter b552, and a first filter c553. Wherein a first filter a551 and a first filter b552 are both disposed in the first pipeline 30, the first filter a551 is located in the section between the first end of the heat exchange branch 53 and the subcooling heat exchanger 51, and the first filter b552 is located on the second side of the first throttling element 52. A first filter c553 is arranged in the heat exchanging branch 53, the first filter c553 being located at the outflow side of the second restriction element 54.

As shown in fig. 4, the first filter group includes four first filters, i.e., a first filter a551, a first filter b552, a first filter c553, and a first filter d554; a first filter a551 and a first filter b552 are disposed in the first pipeline 30 on both sides of the first throttling element 52, respectively, and a first filter c553 and a first filter d554 are disposed in the heat exchanging branch 53 on both sides of the second throttling element 54, respectively.

In the above embodiment, the specific structures of the first filter and the second filter and the number of the first filter and the second filter are limited, and the number of the first filter and the second filter may be three, four, or even more, and those skilled in the art can set the number according to the actual flowing condition of the refrigerant.

In the case of adding the outdoor valve box 50, the flow direction of the refrigerant of the air conditioner is different in different operation modes.

In some embodiments, when the air conditioner is in a cooling operation and the second throttling element 54 is not turned on, the flow direction of the refrigerant is as follows:

referring to fig. 6, the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 21 passes through the four-way valve 22 and exchanges heat with the outdoor heat exchanger 23 to become a high-temperature and high-pressure liquid refrigerant, then sequentially passes through the second filter a241, the third throttling element 24 and the second filter a242, flows into the first pipeline 30, passes through the supercooling heat exchanger 51, at this time, the second throttling element 54 is in a closed state, a part of the pipe section of the first pipeline 30 does not exchange heat with a part of the pipe section of the heat exchange branch 53, the high-temperature and high-pressure liquid refrigerant sequentially passes through the first filter c553, the first throttling element 52 and the first filter d554, flows into the indoor pipeline, passes through the liquid separating assembly 12 and exchanges heat with the indoor heat exchanger 11 to become a low-temperature and low-pressure gaseous refrigerant, sequentially passes through the second pipeline 40, the four-way valve 22 and the gas-liquid separator 25, and returns to the compressor 21, thereby completing a cycle of primary refrigeration.

When the air conditioner is in a cooling operation and the second throttling element 54 is turned on, the flow direction of the refrigerant is as follows:

referring to fig. 7, a high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 21 passes through the four-way valve 22 and exchanges heat with the outdoor heat exchanger 23 to become a high-temperature and high-pressure liquid refrigerant, then sequentially passes through the second filter a241, the third throttling element 24 and the second filter a242, flows into the first pipeline 30, passes through the supercooling heat exchanger 51, at this time, the second throttling element 54 is in an open state, a part of the pipeline section of the first pipeline 30 exchanges heat with a part of the pipeline section of the heat exchange branch 53, and a part of the refrigerant passing through the heat exchange branch 53 returns to the compressor 21 from the second pipeline 40, the four-way valve 22 and the gas-liquid separator 25; part of the high-temperature and high-pressure liquid refrigerant sequentially passes through the first filter c553, the first throttling element 52 and the first filter d554 and then flows into the indoor pipeline, passes through the liquid separating assembly 12 and exchanges heat with the indoor heat exchanger 11 to become a low-temperature and low-pressure gaseous refrigerant, and then sequentially passes through the second pipeline 40, the four-way valve 22 and the gas-liquid separator 25 and then returns to the compressor 21, so that the primary refrigeration cycle is completed.

When the air conditioner is in heating operation, the refrigerant flows in the following directions:

as shown in fig. 8, the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 21 flows into the second pipeline 40 through the four-way valve 22, enters the indoor pipeline to exchange heat with the indoor heat exchanger 11, is changed into a high-temperature and high-pressure liquid refrigerant, flows into the first pipeline 30 through the liquid separating assembly 12, flows into the outdoor pipeline through the first filter d554, the first throttling element 52, the first filter c553 and the cold heat exchanger 51 in sequence, flows into the second pipeline through the second filter a242, the third throttling element 24 and the second filter a241 in sequence, exchanges heat with the outdoor heat exchanger 23, is changed into a low-temperature and low-pressure gaseous refrigerant, flows through the four-way valve 22 and the gas-liquid separator 25 in sequence, and returns to the compressor 21, thereby completing a heating cycle.

The above description and 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

1. An air conditioner, comprising:

an indoor unit;

the outdoor unit is connected with the indoor unit through a first pipeline and a second pipeline to form a refrigerant circulation loop;

the outdoor valve box is arranged outside the room; the outdoor valve box comprises:

a subcooling heat exchanger in which a portion of the tube sections of the first tube run are disposed;

the first throttling element is arranged on the first pipeline;

the first end of the heat exchange branch is connected to a part of pipe section of the first pipeline between the supercooling heat exchanger and the first throttling element, the second end of the heat exchange branch is connected to a pipe section of the second pipeline, and the part of pipe section of the heat exchange branch is arranged in the supercooling heat exchanger so as to exchange heat with the part of pipe section of the first pipeline in the supercooling heat exchanger;

and the second throttling element is arranged on the heat exchange branch.

2. The air conditioner according to claim 1, wherein the second throttling element comprises:

and the electronic expansion valve is arranged on the heat exchange branch and is positioned on a first branch pipeline section of the heat exchange branch between the supercooling heat exchanger and the first pipeline.

3. The air conditioner as claimed in claim 1, wherein the second throttling element comprises:

the capillary tube is arranged on the heat exchange branch and is positioned at a first part of the branch pipe section of the heat exchange branch between the supercooling heat exchanger and the first pipeline;

and the check valve is arranged on the heat exchange branch and is positioned on the second branch pipeline section of the heat exchange branch between the supercooling heat exchanger and the second pipeline.

4. The air conditioner according to claim 1, wherein said outdoor valve box further comprises:

and the first filter group comprises two or more first filters, and the first filters are arranged on the first pipeline and/or the heat exchange branch pipeline.

5. The air conditioner according to claim 4, wherein said first filter group comprises two first filters, both of which are disposed in said first pipeline, one first filter being located in a pipe section between a first end of a heat exchange branch and a supercooling heat exchanger, being a first side of said first throttling element, and the other first filter being located in a second side of said first throttling element; or,

the first filter group comprises three first filters, two first filters are arranged on the first pipeline, and one first filter is arranged on the heat exchange branch; wherein, on the first pipeline, one first filter is positioned in the pipeline section between the first end of the heat exchange branch and the supercooling heat exchanger, and the other first filter is positioned on the second side of the first throttling element; on the heat exchange branch, a first filter is positioned on the liquid outlet side of the second throttling element; or,

6. The air conditioner according to any one of claims 1 to 5, further comprising in the outdoor valve box:

and the valve box temperature sensor is arranged on the first pipeline to detect the temperature of the refrigerant of the first pipeline.

7. The air conditioner as claimed in claim 6, wherein the indoor unit comprises an indoor pipeline, and a liquid separation assembly and an indoor heat exchanger which are arranged on the indoor pipeline; the indoor unit further includes:

8. The air conditioner according to claim 7, wherein the indoor temperature sensor group comprises three indoor temperature sensors respectively disposed on a surface of the indoor heat exchanger, a refrigerant inlet end and a refrigerant outlet line to detect temperatures of corresponding locations.

9. The air conditioner as claimed in claim 6, wherein the outdoor unit includes an outdoor pipe, and a compressor, an outdoor heat exchanger and a third throttling element provided on the outdoor pipe, and second filters are respectively provided at both sides of the third throttling element, the outdoor unit further comprising:

10. The air conditioner according to claim 9, wherein the outdoor temperature sensor group includes four outdoor temperature sensors respectively disposed at a side surface of the outdoor unit, a surface of the outdoor heat exchanger, a discharge end and a return end of the compressor to detect temperatures of the respective locations.