CN216977263U - Air conditioner - Google Patents

Abstract

The application relates to the technical field of air conditioners and discloses an air conditioner. The application provides an air conditioner is including the compressor that connects gradually, indoor heat exchanger, throttling element and outdoor heat exchanger's main circulation circuit. The air conditioner also comprises a bypass pipe section, wherein one end of the bypass pipe section is connected between the compressor and the indoor heat exchanger, and the other end of the bypass pipe section is connected between the throttling element and the outdoor heat exchanger; the bypass pipe section is provided with a first valve body, the first valve body is conducted under the heating condition of the air conditioner, and the refrigerant enters the outdoor heat exchanger through the bypass pipe section to be defrosted. The application provides an air conditioner, when the defrosting to the air conditioner, the refrigerant can be partly through the bypass pipeline section direct inflow outdoor heat exchanger, and the indoor heat exchanger on the main loop that flows through of another part dispels the heat to the indoor temperature decline problem among the defrosting process of avoiding appearing.

Description

Air conditioner

Technical Field

The present application relates to the field of air conditioners, and for example, to an air conditioner.

Background

With the improvement of living standard, the air conditioner has become an indispensable household appliance for improving the quality of life, and the application is wide. In the heating operation in winter, the outdoor heat exchanger is used as an evaporator. When the surface temperature of the outdoor heat exchanger is lower than the dew point temperature under the condition of the external environment temperature, moisture on the surface of the outdoor heat exchanger is accumulated in the form of ice crystals to form a frost layer. The surface frost layer increases heat conduction resistance and reduces air flow passing through the heat exchanger, thereby reducing heat transfer coefficient of the outdoor heat exchanger and reducing heating capacity. The thicker the frost layer is, the poorer the heating performance of the air conditioner is, and the shutdown occurs in severe cases. And therefore, the air conditioner needs to be defrosted periodically or specifically.

In the prior art, in order to defrost an air conditioner, an air conditioner and a defrosting method and device thereof are disclosed. The defrosting device of the air conditioner comprises a module control module, a pre-defrosting control module and a defrosting control module. The mode control module is used for controlling the air conditioner to operate in a heating mode; the pre-defrosting control module is used for identifying that the air conditioner meets pre-defrosting conditions and controlling a pre-defrosting branch in the air conditioner to be opened; the defrosting control module is used for identifying that the air conditioner meets defrosting conditions and controlling the air conditioner to run in a refrigeration mode; the first end of the pre-defrosting branch is located between the indoor heat exchanger and the compressor in the air conditioner, and the second end of the pre-defrosting branch is located between the outdoor heat exchanger and the throttling device in the air conditioner.

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:

the defrosting mode of the existing air conditioner is to start reverse cycle defrosting, namely, refrigeration is started to defrost when a user needs to heat, and the defrosting mode can cause the temperature of an indoor room to be reduced, so that the comfort requirement of the user is seriously 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, when the air conditioner is defrosted, a refrigerant can partially flow into an outdoor heat exchanger through a bypass pipe section directly, and the other part of the refrigerant flows through an indoor heat exchanger on a main circulation loop for heat dissipation, so that the problem of indoor temperature reduction in the defrosting process is avoided.

In some embodiments, the air conditioner includes a main circulation loop of a compressor, an indoor heat exchanger, a throttling element, and an outdoor heat exchanger connected in series. The air conditioner also comprises a bypass pipe section, wherein one end of the bypass pipe section is connected between the compressor and the indoor heat exchanger, and the other end of the bypass pipe section is connected between the throttling element and the outdoor heat exchanger; the bypass pipe section is provided with a first valve body, the first valve body is conducted under the heating condition of the air conditioner, and the refrigerant enters the outdoor heat exchanger through the bypass pipe section to be defrosted.

In some optional embodiments, the first valve body comprises an electronic expansion valve for controlling the flow rate of the refrigerant in the bypass pipe section; the air conditioner is in a defrosting mode, and partial refrigerant or all refrigerant discharged by the compressor flows into the outdoor heat exchanger through the bypass pipe section by adjusting the opening degree of the electronic expansion valve.

In some optional embodiments, the first valve body comprises a solenoid valve for controlling the conduction or the closing of the bypass pipe section; the air conditioner is conducted by controlling the electromagnetic valve under the defrosting mode, so that part of the refrigerant is discharged by the compressor and flows into the outdoor heat exchanger through the bypass pipe section, and the other part of the refrigerant is discharged by the compressor and flows through the indoor heat exchanger and the throttling element.

In some optional embodiments, the air conditioner is in the cooling mode, the first valve body is closed, and the bypass pipe section is not communicated.

In some optional embodiments, the air conditioner further comprises a second valve body located between the indoor heat exchanger and the compressor, wherein the pipe section in which the second valve body, the indoor heat exchanger and the throttling element are located is a first pipe section, and the first pipe section is connected with the bypass pipe section in parallel.

In some alternative embodiments, the second valve body comprises a shut-off valve or a solenoid valve.

In some alternative embodiments, the throttling element comprises a throttle valve to control the refrigerant flow rate of the first pipe section.

In some optional embodiments, the outdoor heat exchanger is configured with a first temperature sensor for detecting a real-time temperature of the outdoor heat exchanger.

In some optional embodiments, the air conditioner further includes a control unit configured to control an opening degree of the first valve body according to a temperature of the outdoor heat exchanger.

In some optional embodiments, the air conditioner further comprises a control unit configured to control an opening degree of the first valve body according to the indoor ambient temperature and the outdoor heat exchanger surface temperature, so as to operate the air conditioner in a cooling mode, a heating mode or a defrosting mode.

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

the air conditioner comprises a compressor, an indoor heat exchanger, a throttling element and a main circulation loop of an outdoor heat exchanger which are connected in sequence. The air conditioner also comprises a bypass pipe section, wherein one end of the bypass pipe section is connected between the compressor and the indoor heat exchanger, and the other end of the bypass pipe section is connected between the throttling element and the outdoor heat exchanger; the bypass pipe section is provided with a first valve body, the first valve body is conducted under the heating working condition of the air conditioner, and the refrigerant enters the outdoor heat exchanger through the bypass pipe section to defrost. When the air conditioner is defrosted, part of the refrigerant can directly flow into the outdoor heat exchanger through the bypass pipe section, and the other part of the refrigerant flows through the indoor heat exchanger on the main circulation loop to dissipate heat, so that the problem of indoor temperature reduction in the defrosting process is avoided.

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 not in a limiting sense, in which elements having the same reference numeral designations represent like elements, and in which:

fig. 1 is a schematic view illustrating a connection relationship of components in an air conditioner according to an embodiment of the present disclosure;

fig. 2 is a refrigerant circulation diagram illustrating a defrosting mode of the air conditioner according to an embodiment of the disclosure;

fig. 3 is a schematic diagram illustrating refrigerant circulation in a heating mode of an air conditioner according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating a refrigerant flow in a cooling mode of the air conditioner according to the embodiment of the disclosure.

Reference numerals:

1: a compressor; 2: an indoor heat exchanger; 3: a throttling element; 4: an outdoor heat exchanger; 5: a first valve body; 6: a second valve body; 7: a first tube section; 8: a bypass pipe section.

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

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

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

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

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. For example, a and/or B, represents: a or B, or A and B.

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

Referring to fig. 1 to 4, an embodiment of the present disclosure provides an air conditioner.

The traditional air conditioner is provided with a pre-defrosting branch on the air conditioner. The first end of the pre-defrosting branch is located between the indoor heat exchanger 2 and the compressor 1, and the second end of the pre-defrosting branch is located between the outdoor heat exchanger 4 and the throttling device. Before the air conditioner executes the defrosting program, the outlet temperature and the pressure of the outdoor heat exchanger 4 are raised by opening the pre-defrosting branch, so that the return air pressure and/or the return air temperature of the return air port of the compressor 1 are raised, and the exhaust air temperature of the exhaust port of the compressor 1 is raised. In the initial stage of defrosting, since the discharge temperature of the discharge port of the compressor 1 is high, the temperature of the refrigerant discharged from the compressor 1 in the initial stage of defrosting is high, and thus the defrosting efficiency in the initial stage of defrosting can be improved. The defrosting method of the traditional air conditioner is optimized during the refrigerating operation, and the problem of indoor temperature reduction in the defrosting process cannot be solved.

The air conditioner provided by the embodiment of the disclosure comprises a main circulation loop of a compressor 1, an indoor heat exchanger 2, a throttling element 3 and an outdoor heat exchanger 4 which are sequentially connected. The air conditioner also comprises a bypass pipe section 8, one end of the bypass pipe section 8 is connected between the compressor 1 and the indoor heat exchanger 2, and the other end of the bypass pipe section 8 is connected between the throttling element 3 and the outdoor heat exchanger 4; the bypass pipe section 8 is provided with a first valve body 5, the first valve body 5 is conducted under the heating condition of the air conditioner, and the refrigerant enters the outdoor heat exchanger 4 through the bypass pipe section 8 to defrost.

During heating operation in winter, the surface of the outdoor heat exchanger 4 is easily frosted. The frost layer increases thermal conductivity resistance and decreases the flow rate of air flowing through the heat exchanger, thereby causing a decrease in the heat transfer coefficient of the outdoor heat exchanger 4 and a decrease in heating capacity. The thicker the frost layer is, the worse the heating performance of the air conditioner is. The utility model provides an air conditioner when needs defrost, opens first valve body 5, and compressor 1 exhausts, and partly flows to the condenser import through 8 direct flows of bypass pipe sections, and outdoor heat exchanger 4 promptly changes the frost, and another part flows to indoor heat exchanger 2 in order to heat indoorly. Therefore, the defrosting purpose is achieved, and the heating effect is guaranteed.

Optionally, the first valve body 5 comprises an electronic expansion valve for controlling the flow of refrigerant in the bypass section 8; in the defrosting mode, the air conditioner adjusts the opening degree of the electronic expansion valve to enable part or all of the refrigerant to be discharged from the compressor 1 and flow into the outdoor heat exchanger 4 through the bypass pipe section 8.

The electronic expansion valve is arranged at the bypass pipe section 8, so that the refrigerant volume ratio directly flowing into the outdoor heat exchanger 4 and the indoor heat exchanger 2 can be better distributed, and the outdoor frosting degree and the indoor environment temperature can be better considered. Specifically, when outdoor frosting is thick and the indoor environment temperature is high, the opening degree of the electronic expansion valve can be increased, so that the defrosting efficiency is improved; when outdoor frosting is thin and the indoor environment temperature is low, the opening degree of the electronic expansion valve can be increased, so that defrosting is carried out on the outdoor heat exchanger 4 while heating is guaranteed to meet the indoor environment temperature requirement; after the outdoor defrosting, the electronic expansion valve is closed, so that all the refrigerant flows to the indoor heat exchanger 2 to heat the indoor air, and the heating capacity is improved. It is understood that the first valve body 5 may also be a throttle solenoid valve as long as the opening degree can be adjusted.

Optionally, the first valve body 5 comprises a solenoid valve for controlling the opening or closing of the bypass pipe section 8; in the defrosting mode, the air conditioner is conducted by controlling the electromagnetic valve, so that part of the refrigerant is discharged from the compressor 1 and flows into the outdoor heat exchanger 4 through the bypass pipe section 8, and the other part of the refrigerant is discharged from the compressor 1 and flows through the indoor heat exchanger 2 and the throttling element 3. Specifically, when the air conditioner needs defrosting, the control electromagnetic valve is conducted. A part of refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the throttling element 3 and the outdoor heat exchanger 4 to ensure the indoor heating effect; the other part of the refrigerant is discharged from the compressor 1 and then directly flows into the outdoor heat exchanger 4 to be defrosted and defrosted. It is understood that the first valve body 5 may be other valves without adjusting the opening degree, as long as the on/off of the bypass pipe section 8 can be controlled.

Optionally, in the air conditioner in the cooling mode, the first valve body 5 is closed, and the bypass pipe section 8 is not communicated. When the air conditioner operates in a refrigerating mode, a refrigerant sequentially flows through the compressor 1, the outdoor heat exchanger 4, the throttling element 3 and the indoor heat exchanger 2.

Optionally, the air conditioner further comprises a second valve body 6 located between the indoor heat exchanger 2 and the compressor 1, wherein the pipe sections where the second valve body 6, the indoor heat exchanger 2 and the throttling element 3 are located are first pipe sections 7, and the first pipe sections 7 are connected in parallel with the bypass pipe section 8. When the indoor environment temperature of the user is high and the outdoor heat exchanger 4 is frosted seriously, the second valve body 6 can be controlled to be closed, so that all the refrigerants discharged by the compressor 1 directly flow into the outdoor heat exchanger 4, and the defrosting efficiency is improved to the maximum extent.

Optionally, the second valve body 6 comprises a shut-off valve or a solenoid valve. It can be understood that the second valve body 6 only needs to be capable of conducting and stopping the indoor heat exchanger 2 and the pipe section where the throttling element 3 is located.

Optionally, the throttling element 3 comprises a throttle valve to control the refrigerant flow of the first pipe section 7. It can be understood that the throttle valve may be not only a capillary tube, but also other throttle elements 3 such as a throttle solenoid valve or an expansion valve, and may be specifically selected according to the size or functional requirements of the air conditioner. In order to improve the user experience when the air conditioner is defrosted, the throttle expansion valve is preferred. Therefore, the system can be flexibly adjusted according to different temperatures and pressures, and the system can be optimized under different conditions.

In one embodiment, the first valve body 5 is a solenoid valve, the second valve body 6 is a stop valve, and the throttling element 3 is an electronic expansion valve.

When the air conditioning system runs in a refrigeration mode, the control electromagnetic valve is closed, and the stop valve is communicated. The refrigerant flows through the compressor 1, the outdoor heat exchanger 4, the electronic expansion valve and the indoor heat exchanger 2 in sequence. Therefore, the normal operation of the refrigeration mode is ensured, and the refrigeration effect of the air conditioning system is ensured.

When the air conditioning system operates in a heating mode, the stop valve is controlled to be switched on, the electromagnetic valve is controlled to be switched off, and the refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the electronic expansion valve and the outdoor heat exchanger 4. Under the condition that the outdoor heat exchanger 4 is not frosted, a better heating effect can be obtained by controlling the valve body.

And when the air conditioning system operates in the defrosting mode, the stop valve and the electromagnetic valve are controlled to be conducted. A part of refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the electronic expansion valve and the outdoor heat exchanger 4; the other part of the refrigerant is discharged from the compressor 1 and then flows directly into the outdoor heat exchanger 4. Thus, the refrigerant can be ensured to flow through the indoor heat exchanger 2 to carry out indoor heating, and a part of the refrigerant can directly flow to the outdoor heat exchanger 4 to carry out defrosting.

In one embodiment, the first valve body 5 is an electronic expansion valve, the second valve body 6 is an electromagnetic valve, and the throttling element 3 is a capillary tube. Thus, the refrigerant flow rate flowing into the bypass line can be better distributed in the defrosting mode.

When the air conditioning system runs in a refrigeration mode, the electronic expansion valve is controlled to be closed, and the electromagnetic valve is controlled to be conducted. The refrigerant flows through the compressor 1, the outdoor heat exchanger 4, the capillary tube and the indoor heat exchanger 2 in sequence. Therefore, the normal operation of the refrigeration mode is ensured, and the refrigeration effect of the air conditioning system is ensured.

When the air conditioning system runs in a heating mode, the electromagnetic valve is controlled to be switched on, the electronic expansion valve is controlled to be switched off, and the refrigerant flows through the compressor 1, the indoor heat exchanger 2, the capillary tube and the outdoor heat exchanger 4 in sequence. Under the condition that the outdoor heat exchanger 4 is not frosted, a better heating effect can be obtained by controlling the valve body.

When the air conditioning system operates in the defrosting mode, the electromagnetic valve and the electronic expansion valve are controlled to be communicated. A part of refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the capillary tube and the outdoor heat exchanger 4; the other part of the refrigerant is discharged from the compressor 1 and directly flows into the outdoor heat exchanger 4. Thus, the refrigerant can be ensured to flow through the indoor heat exchanger 2 to carry out indoor heating, and a part of the refrigerant can directly flow to the outdoor heat exchanger 4 to carry out defrosting.

As an example, the first valve body 5, the second valve body 6 and the throttling element 3 are all electronic expansion valves. Therefore, all the valve bodies can be regulated and controlled by the control unit, the opening degree of the valve bodies can be regulated, and the flow speed of the refrigerant can be regulated.

When the air conditioning system operates in a cooling mode, the electronic expansion valve of the bypass pipe section 8 is controlled to be closed, and the electronic expansion valve of the first pipe section 7 is controlled to be conducted. The refrigerant flows through the compressor 1, the outdoor heat exchanger 4, the electronic expansion valve and the indoor heat exchanger 2 in sequence. Therefore, the normal operation of the refrigeration mode is ensured, and the refrigeration effect of the air conditioning system is ensured. And the cold capacity can be better adjusted and controlled by adjusting the opening of each valve body.

When the air conditioning system operates in a heating mode, the electronic expansion valve of the first pipe section 7 is controlled to be switched on, the electronic expansion valve of the bypass pipe section 8 is controlled to be switched off, and a refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the electronic expansion valve and the outdoor heat exchanger 4. Under the condition that the outdoor heat exchanger 4 is not frosted, a better heating effect can be obtained by controlling the valve body. And the heating capacity can be better regulated and controlled by adjusting the opening of each valve body.

When the air conditioning system operates in the defrosting mode, the electronic expansion valves on the bypass pipe section 8 and the first pipe section 7 are controlled to be communicated. A part of refrigerant sequentially flows through the compressor 1, the indoor heat exchanger 2, the electronic expansion valve and the outdoor heat exchanger 4; the other part of the refrigerant is discharged from the compressor 1 and then flows directly into the outdoor heat exchanger 4. Thus, the refrigerant can be ensured to flow through the indoor heat exchanger 2 to carry out indoor heating, and a part of the refrigerant can directly flow to the outdoor heat exchanger 4 to carry out defrosting. And by adjusting the opening of each valve body, the defrosting capacity and the heating capacity can be better regulated and controlled, and the dual requirements of heating and defrosting of users are met.

Optionally, the air conditioner further comprises a four-way valve, wherein a first end and a second end of the four-way valve are connected to the compressor 1, a third end of the four-way valve is connected to the outdoor heat exchanger 4, and a fourth end of the four-way valve is connected to the second valve body 6. When the defrosting mode is switched, part of the exhaust gas from the compressor 1 is converted by the four-way valve, then directly flows to the inlet of the condenser for defrosting through the bypass pipe section 8, and the other part of the exhaust gas flows to the indoor for heating.

Alternatively, the refrigerant circulating in the air conditioner is a coolant, such as freon, saturated hydrocarbon, unsaturated hydrocarbon, and the like.

Optionally, the outdoor heat exchanger 4 is configured with a first temperature sensor for detecting a real-time temperature of the outdoor heat exchanger 4. The temperature of the outdoor heat exchanger 4 is monitored in real time through the first temperature sensor, and the frosting degree of the outdoor heat exchanger 4 can be judged in real time. Combine indoor ambient temperature, through the aperture of adjusting first valve body 5, refrigerant flow in distribution bypass pipe section 8 and the first pipe section 7 that can be more balanced promotes user's use and experiences.

Optionally, the air conditioner further includes a control unit configured to control the opening degree of the first valve body 5 according to the temperature of the outdoor heat exchanger 4. It can be understood that the frosting thickness of the outdoor heat exchanger 4 can be judged by combining the dew point temperature under the condition of the outer ring temperature, and then the opening degree and the defrosting time of the first valve body 5 can be controlled according to the preset defrosting grade and the setting of the defrosting parameter, so that the defrosting starting time and the defrosting ending time can be better judged, and unnecessary energy consumption can be avoided.

Optionally, the air conditioner further comprises a control unit configured to control the opening degree of the first valve body 5 according to the indoor ambient temperature and the surface temperature of the outdoor heat exchanger 4, so as to operate the air conditioner in a cooling mode, a heating mode or a defrosting mode. In the operation and heating process of the existing household air conditioner, the outdoor unit is used as an evaporator, when the evaporation temperature is lower than the dew point temperature under the condition of outer ring temperature, the outdoor unit begins to frost, and when the frost is formed to a certain thickness, the heating capacity of the air conditioner is lower and lower, so that the outdoor unit needs to be defrosted in order to ensure the heating effect. However, the existing defrosting mode is to start reverse cycle defrosting, that is, to start refrigeration to defrost when a user needs heating, and this defrosting mode will cause the temperature of an indoor room to drop, and seriously affects the comfort requirement of the user. This application is through combining indoor ambient temperature and 4 surface temperature of outdoor heat exchanger, and the opening that can control first valve body 5 better and the operation of defrosting mode is long to make the more accurate switching of air conditioner to defrosting mode. Compare in traditional defrost mode, the air conditioner of this application can realize indoor heating operation simultaneously at the defrost mode in-process. Therefore, the defrosting purpose is achieved, and the heating effect is guaranteed.

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 (10)

1. The utility model provides an air conditioner, includes the main circulation circuit of compressor, indoor heat exchanger, throttling element and outdoor heat exchanger that connects gradually, its characterized in that still includes:

a bypass pipe section having one end connected between the compressor and the indoor heat exchanger and the other end connected between the throttling element and the outdoor heat exchanger;

the bypass pipe section is provided with a first valve body, the first valve body is communicated under the heating condition of the air conditioner, and the refrigerant enters the outdoor heat exchanger through the bypass pipe section to be defrosted.

2. The air conditioner of claim 1, wherein the first valve body comprises:

the electronic expansion valve is used for controlling the flow of the refrigerant in the bypass pipe section;

and in the defrosting mode, the air conditioner adjusts the opening degree of the electronic expansion valve to enable part or all of the refrigerant discharged by the compressor to flow into the outdoor heat exchanger through the bypass pipe section.

3. The air conditioner of claim 1, wherein the first valve body comprises:

the electromagnetic valve is used for controlling the conduction or the closing of the bypass pipe section;

and in the defrosting mode of the air conditioner, the electromagnetic valve is controlled to be conducted, so that part of the refrigerant is discharged from the compressor and flows into the outdoor heat exchanger through the bypass pipe section, and the other part of the refrigerant is discharged from the compressor and flows through the indoor heat exchanger and the throttling element.

4. The air conditioner according to any one of claims 1 to 3,

in the air conditioner, in the cooling mode, the first valve body is closed, and the bypass pipe section is blocked.

5. The air conditioner according to claim 1, further comprising:

a second valve body positioned between the indoor heat exchanger and the compressor,

the second valve body, the indoor heat exchanger and the pipe section where the throttling element is located are first pipe sections, and the first pipe sections are connected with the bypass pipe section in parallel.

6. The air conditioner according to claim 5,

the second valve body comprises a stop valve or a solenoid valve.

7. The air conditioner of claim 5, wherein the throttling element comprises:

and the throttle valve is used for controlling the refrigerant flow of the first pipe section.

8. The air conditioner according to claim 1,

the outdoor heat exchanger is provided with a first temperature sensor, and the first temperature sensor is used for detecting the real-time temperature of the outdoor heat exchanger.

9. The air conditioner according to claim 2, further comprising a control unit configured to:

and controlling the opening degree of the first valve body according to the temperature of the outdoor heat exchanger.

10. The air conditioner according to claim 2, further comprising a control unit configured to:

and controlling the opening of the first valve body according to the indoor environment temperature and the surface temperature of the outdoor heat exchanger so as to enable the air conditioner to operate in a refrigeration mode, a heating mode or a defrosting mode.

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