阅读说明：本技术 空调机组及其控制方法 (Air conditioning unit and control method thereof ) 是由 陈敏 张仕强 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种空调机组及其控制方法,其中,该空调机组包括：依次相连的压缩机、四通阀、第一室外换热器、第一室外电子膨胀阀、室内换热器和气液分离器；第二室外换热器,包括第一端口、第二端口、第三端口和第四端口；其中,第一端口和第三端口连通,第二端口与第四端口连通；第一端口与室内换热器连接,第三端口与室外电子膨胀阀连接,第二端口与位于第三端口和第一室外电子膨胀阀之间的第一连接点连接,第四端口与气液分离器的入口连接；压缩机的排气口还与位于第一端口与室内换热器之间的第二连接点连接。本发明解决了现有技术中空调机组化霜完成后运行模式转换带来的噪音较大的问题,有效降低了噪音,提高了用户的舒适性和体验感。(The invention discloses an air conditioning unit and a control method thereof, wherein the air conditioning unit comprises: the compressor, the four-way valve, the first outdoor heat exchanger, the first outdoor electronic expansion valve, the indoor heat exchanger and the gas-liquid separator are sequentially connected; a second outdoor heat exchanger including a first port, a second port, a third port, and a fourth port; the first port is communicated with the third port, and the second port is communicated with the fourth port; the first port is connected with the indoor heat exchanger, the third port is connected with the outdoor electronic expansion valve, the second port is connected with a first connecting point between the third port and the first outdoor electronic expansion valve, and the fourth port is connected with an inlet of the gas-liquid separator; the discharge port of the compressor is also connected to a second connection point between the first port and the indoor heat exchanger. The invention solves the problem of higher noise caused by the operation mode conversion after the defrosting of the air conditioning unit is finished in the prior art, effectively reduces the noise and improves the comfort and experience of users.)

1. An air conditioning assembly comprising: compressor (1), cross valve (2), first outdoor heat exchanger (3), first outdoor electronic expansion valve (4), indoor heat exchanger (5) and vapour and liquid separator (6) that link to each other in proper order, its characterized in that, air conditioning unit still includes:

a second outdoor heat exchanger (7) provided with a first port (71), a second port (72), a third port (73), and a fourth port (74); wherein the first port (71) and the third port (73) are in communication, and the second port (72) is in communication with the fourth port (74);

the first port (71) is connected with the indoor heat exchanger (5), the third port (73) is connected with the first outdoor electronic expansion valve (4), the second port (72) is connected with a first connecting point between the third port (73) and the first outdoor electronic expansion valve (4), and the fourth port (74) is connected with an inlet of the gas-liquid separator (6);

the discharge port of the compressor (1) is further connected to a second connection point between the first port (71) and the indoor heat exchanger (5).

2. The air conditioning assembly as set forth in claim 1, further comprising:

a first on-off valve (8) located in the line between the discharge of the compressor (1) and the second connection point.

3. The air conditioning assembly according to claim 1, wherein a D port of the four-way valve (2) is connected to an exhaust port of the compressor (1), a C port of the four-way valve (2) is connected to the first outdoor heat exchanger (3), an S port of the four-way valve (2) is connected to a third connection point between the fourth port (74) and an inlet of the gas-liquid separator (6), and an E port of the four-way valve (2) is connected to the indoor heat exchanger (5); the air conditioning unit further includes:

and the second switch valve (9) is positioned on a pipeline between the S port of the four-way valve (2) and the third connection point.

4. The air conditioning assembly as set forth in claim 3, further comprising:

a second outdoor electronic expansion valve (10) located on the line between the third port (73) and the first connection point;

and one end of the third switch valve (11) is connected with a fourth connection point between the second switch valve (9) and the S port of the four-way valve (2), and the other end of the third switch valve is connected with a fifth connection point between the third port (73) and the second outdoor electronic expansion valve (10).

5. The air conditioning assembly as set forth in claim 1, further comprising:

a fourth switching valve (12) located on the pipeline between the indoor heat exchanger (5) and the second connection point;

and one end of the indoor electronic expansion valve (13) is connected with the indoor heat exchanger (5), and the other end of the indoor electronic expansion valve is connected with the fourth switch valve (12).

6. The air conditioning assembly as set forth in claim 3, further comprising:

and the fifth switching valve (14) is positioned on a pipeline between the E port of the four-way valve (2) and the indoor heat exchanger (5).

7. An air conditioning unit control method applied to an air conditioning unit according to any one of claims 1 to 6, the method comprising:

after the air conditioning unit enters a defrosting mode, detecting whether the air conditioning unit meets a defrosting exit condition;

and if the defrosting exit condition is met, controlling the air conditioning unit to enter an outdoor self-circulation mode, so that the refrigerant of the outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor.

8. The method of claim 7, wherein controlling the air conditioning unit into an outdoor self-circulation mode comprises:

and an S port of the four-way valve is connected with a C port, a D port of the four-way valve is connected with an E port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be disconnected, and the first switch valve and the third switch valve are controlled to be closed.

9. The method of claim 7, after controlling the air conditioning unit to enter the outdoor self-circulation mode, further comprising:

detecting the ratio of the discharge pressure and the suction pressure of the compressor;

and when the ratio is smaller than a preset threshold value, controlling the air conditioning unit to enter a heating mode.

10. The method of claim 7, further comprising, prior to the air conditioning unit operating in the defrost mode:

controlling the air conditioning unit to enter a heating mode;

after the air conditioning unit enters the heating mode, detecting whether the air conditioning unit meets a defrosting entry condition;

and if the defrosting entering condition is met, controlling the air conditioning unit to enter a defrosting mode.

11. The method of claim 10, wherein controlling the air conditioning unit into a heating mode comprises:

an S port of the four-way valve is controlled to be connected with a C port, a D port of the four-way valve is controlled to be connected with an E port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be closed, and the first switch valve and the third switch valve are controlled to be disconnected;

controlling the air conditioning unit to enter a defrosting mode, comprising: and controlling an S port of the four-way valve to be connected with an E port, controlling a D port of the four-way valve to be connected with a C port, controlling the second switch valve, the fourth switch valve and the fifth switch valve to be closed, and controlling the first switch valve and the third switch valve to be disconnected.

12. A storage medium containing computer-executable instructions for performing the air conditioning pack control method of any of claims 7 to 11 when executed by a computer processor.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioning unit and a control method thereof.

Background

In the prior art, an air conditioning unit is easy to frost during operation in a heating mode, so that defrosting is usually carried out by switching the heating mode to the cooling mode, and after defrosting is finished, the air conditioning unit is switched to the heating mode to operate. However, when the heating mode is switched after defrosting is finished, the four-way valve (2) is reversed under the condition of high pressure difference, the reversed air flow noise is transmitted to the indoor side along with the refrigerant, and meanwhile, the impact sound between the high-pressure air flow and the liquid fluid in the pipeline at the inner side increases the indoor noise.

Aiming at the problem of loud noise caused by operation mode conversion after defrosting of an air conditioning unit is finished in the related art, an effective solution is not provided at present.

Disclosure of Invention

The invention provides an air conditioning unit and a control method thereof, which at least solve the problem of higher noise caused by operation mode conversion after defrosting of the air conditioning unit is finished in the prior art.

To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided an air conditioning unit including: the compressor, the four-way valve, the first outdoor heat exchanger, the first outdoor electronic expansion valve, the indoor heat exchanger and the gas-liquid separator are sequentially connected; a second outdoor heat exchanger including a first port, a second port, a third port, and a fourth port; the first port is communicated with the third port, and the second port is communicated with the fourth port; the first port is connected with the indoor heat exchanger, the third port is connected with the outdoor electronic expansion valve, the second port is connected with a first connecting point between the third port and the first outdoor electronic expansion valve, and the fourth port is connected with an inlet of the gas-liquid separator; the discharge port of the compressor is also connected to a second connection point between the first port and the indoor heat exchanger.

Further, still include: and a first switching valve located on a pipeline between the discharge port of the compressor and the second connection point.

Furthermore, a D port of the four-way valve is connected with an exhaust port of the compressor, a C port of the four-way valve is connected with the first outdoor heat exchanger, an S port of the four-way valve is connected with a third connecting point between the fourth port and the inlet of the gas-liquid separator, and an E port of the four-way valve is connected with the indoor heat exchanger; the air conditioning unit still includes: and the second switch valve is positioned on a pipeline between the S port of the four-way valve and the third connection point.

Further, still include: the second outdoor electronic expansion valve is positioned on the pipeline between the third port and the first connecting point; and one end of the third switch valve is connected with a fourth connection point between the second switch valve and the S port of the four-way valve, and the other end of the third switch valve is connected with a fifth connection point between the third port and the second outdoor electronic expansion valve.

Further, still include: the fourth switching valve is positioned on a pipeline between the indoor heat exchanger and the second connecting point; and one end of the indoor electronic expansion valve is connected with the indoor heat exchanger, and the other end of the indoor electronic expansion valve is connected with the fourth switch valve.

Further, still include: and the fifth switch valve is positioned on a pipeline between the port E of the four-way valve and the indoor heat exchanger.

According to another aspect of the embodiments of the present invention, there is provided an air conditioning unit control method, applied to the air conditioning unit as described above, the method including: after the air conditioning unit enters a defrosting mode, detecting whether the air conditioning unit meets a defrosting exit condition; and if the defrosting exit condition is met, controlling the air conditioning unit to enter an outdoor self-circulation mode, so that the refrigerant of the outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor.

Further, the control air conditioning unit enters an outdoor self-circulation mode, and the control air conditioning unit comprises the following steps: and an S port of the four-way valve is connected with a C port, a D port of the four-way valve is connected with an E port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be disconnected, and the first switch valve and the third switch valve are controlled to be closed.

Further, after controlling the air conditioning unit to enter the outdoor self-circulation mode, the method further comprises the following steps: detecting the ratio of the exhaust pressure and the suction pressure of the compressor; and when the ratio is smaller than a preset threshold value, controlling the air conditioning unit to enter a heating mode.

Further, before the air conditioning unit operates the defrosting mode, the method further comprises the following steps: controlling the air conditioning unit to enter a heating mode; after the air conditioning unit enters a heating mode, detecting whether the air conditioning unit meets defrosting entry conditions; and if the defrosting entering condition is met, controlling the air conditioning unit to enter a defrosting mode.

Further, controlling the air conditioning unit to enter a heating mode comprises the following steps: controlling an S port of the four-way valve to be connected with a C port, controlling a D port of the four-way valve to be connected with an E port, controlling the second switch valve, the fourth switch valve and the fifth switch valve to be closed, and controlling the first switch valve and the third switch valve to be disconnected; controlling an air conditioning unit to enter a defrosting mode, comprising: and an S port of the four-way valve is connected with an E port, a D port of the four-way valve is connected with a C port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be closed, and the first switch valve and the third switch valve are controlled to be disconnected.

According to yet another aspect of an embodiment of the present invention, there is provided a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.

The invention provides an air conditioning unit capable of effectively reducing noise, which comprises a first outdoor heat exchanger and a second outdoor heat exchanger, wherein the second outdoor heat exchanger is respectively connected with an outdoor electronic expansion valve, a gas-liquid separator and an exhaust port of a compressor and is used for entering an outdoor self-circulation mode after defrosting is quitted, so that a refrigerant of an outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor, the problems of reversing airflow noise and large indoor noise caused by impact sound between high-pressure airflow and liquid fluid in an inner side pipeline when the operation mode of the air conditioning unit is converted after defrosting is avoided, the noise of an indoor unit is effectively reduced when the operation mode of the air conditioning unit is converted after defrosting is finished, and the comfort and experience of users are improved.

Drawings

Fig. 1 is a schematic view of an alternative configuration of an air conditioning assembly according to an embodiment of the present invention;

fig. 2 is a refrigerant flow path diagram of a heating mode of the air conditioning unit according to the embodiment of the invention;

fig. 3 is a diagram of a cooling mode refrigerant flow path of an air conditioning unit according to an embodiment of the invention;

FIG. 4 is a diagram of an outdoor self-circulation mode refrigerant flow path of an air conditioning unit according to an embodiment of the present invention;

FIG. 5 is an alternative flow chart of an air conditioning unit control method according to an embodiment of the present invention; and

fig. 6 is another alternative flow chart of an air conditioning unit control method according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

Example 1

In a preferred embodiment 1 of the present invention, an air conditioning unit is provided, and specifically, fig. 1 shows an alternative structural schematic diagram of the air conditioning unit, as shown in fig. 1, the unit includes:

the system comprises a compressor 1, a four-way valve 2, a first outdoor heat exchanger 3, a first outdoor electronic expansion valve 4, an indoor heat exchanger 5 and a gas-liquid separator 6 which are connected in sequence;

a second outdoor heat exchanger 7 including a first port 71, a second port 72, a third port 73, and a fourth port 74; wherein the first port 71 is communicated with the third port 73, and the second port 72 is communicated with the fourth port 74; the first port 71 is connected to the indoor heat exchanger 5, the third port 73 is connected to the outdoor electronic expansion valve, the second port 72 is connected to a first connection point between the third port 73 and the first outdoor electronic expansion valve 4, and the fourth port 74 is connected to the inlet of the gas-liquid separator 6;

the discharge port of the compressor 1 is also connected to a second connection point between the first port 71 and the indoor heat exchanger 5. Therefore, the air conditioning unit forms an outdoor self-circulation system, and comprises the first outdoor heat exchanger 3, the second outdoor heat exchanger 7, the outdoor electronic expansion valve, the gas-liquid separator 6, the compressor 1, the relevant switch valve and other components, the outdoor self-circulation mode is entered after the defrosting is exited, and the refrigerant is self-circulated outdoors, so that the problem of high indoor noise caused by the switching of the operation mode after the defrosting of the air conditioning unit is finished is avoided.

In the above embodiment, an air conditioning unit capable of effectively reducing noise is provided, the air conditioning unit includes a first outdoor heat exchanger 3 and a second outdoor heat exchanger 7, the second outdoor heat exchanger 7 is respectively connected to an outdoor electronic expansion valve, a gas-liquid separator 6 and an exhaust port of a compressor 1, and is configured to enter an outdoor self-circulation mode after exiting defrosting, so that a refrigerant of an outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger 3, the second outdoor heat exchanger 7 and the compressor 1, thereby avoiding a problem that an indoor noise caused by impact sound between a high-pressure airflow and a liquid fluid in an inner side pipeline is large when an operation mode of the air conditioning unit is switched after defrosting is completed, effectively reducing noise of the indoor unit when the operation mode of the air conditioning unit is switched after defrosting is completed, and improving comfort and experience of a user. Further, still include: and a first switching valve 8 on a line between the discharge port of the compressor 1 and the second connection point. The first switching valve 8 controls the opening and closing of a pipe between the discharge port of the compressor 1 and the second connection point, which is conducted when the outdoor unit is self-circulated.

As shown in fig. 1, a D port of the four-way valve 2 is connected to an exhaust port of the compressor 1, a C port of the four-way valve 2 is connected to the first outdoor heat exchanger 3, an S port of the four-way valve 2 is connected to a third connection point between the fourth port 74 and an inlet of the gas-liquid separator 6, and an E port of the four-way valve 2 is connected to the indoor heat exchanger 5; the air conditioning unit still includes: and a second switching valve 9 provided on a line between the S port of the four-way valve 2 and the third connection point. The second switch valve 9 can control the flow direction of the refrigerant from the S port of the four-way valve 2, and when the second switch valve 9 is switched on, the refrigerant from the S port directly enters the gas-liquid separator 6 and is consistent with the conventional heat exchange mode. When the second switch valve 9 is disconnected, the refrigerant from the S port enters the third switch valve 11, one end of the third switch valve 11 is connected with a fourth connection point between the second switch valve 9 and the S port of the four-way valve 2, and the other end of the third switch valve 11 is connected with a fifth connection point between the third port 73 and the second outdoor electronic expansion valve 10; and a second outdoor electronic expansion valve 10 on a pipe between the third port 73 and the first connection point.

In addition, this air conditioning unit still includes: a fourth switching valve 12 located on a pipe between the indoor heat exchanger 5 and the second connection point; and one end of the indoor electronic expansion valve 13 is connected with the indoor heat exchanger 5, and the other end of the indoor electronic expansion valve is connected with the fourth switching valve 12. And a fifth switching valve 14 on a pipeline between the port E of the four-way valve 2 and the indoor heat exchanger 5.

The heating mode, the refrigerating and defrosting mode and the outdoor self-circulation mode of the air conditioning unit can be realized through the control of the switch valve and the four-way valve 2.

Fig. 2 shows a heating mode refrigerant flow path diagram of the air conditioning unit, and as shown in fig. 2, the S port of the four-way valve 2 is connected to the C port, the D port of the four-way valve 2 is connected to the E port, the second on-off valve 9, the fourth on-off valve 12, and the fifth on-off valve 14 are closed, and the first on-off valve 8 and the third on-off valve 11 are opened. The refrigerant flowing out of the third port 73 of the second outdoor heat exchanger 7 is divided into two paths, wherein one path enters the first outdoor electronic expansion valve 4, and then enters the gas-liquid separator 6 after passing through the four-way valve 2 and the second switch valve 9; the other path enters the second outdoor electronic expansion valve 10, then enters the second outdoor electronic expansion valve 10, passes through the second and fourth ports 74 of the second outdoor heat exchanger 7, and then enters the gas-liquid separator 6.

Fig. 3 is a diagram showing a cooling (defrosting) mode refrigerant flow path of the air conditioning unit, and as shown in fig. 3, the S port of the four-way valve 2 is connected to the E port, the D port of the four-way valve 2 is connected to the C port, the second on-off valve 9, the fourth on-off valve 12, and the fifth on-off valve 14 are closed, and the first on-off valve 8 and the third on-off valve 11 are opened. The refrigerant flowing out of the first outdoor electronic expansion valve 4 is divided into two paths, one path enters the second outdoor electronic expansion valve 10, then enters the second and fourth ports 74 of the second outdoor heat exchanger 7, and then enters the gas-liquid separator 6. The other path enters the third and first ports 71 of the second outdoor heat exchanger 7, then passes through the indoor electronic expansion valve 13 and the indoor heat exchanger 5, passes through the four-way valve 2, and then enters the gas-liquid separator 6.

Fig. 4 is a diagram showing an outdoor self-circulation mode refrigerant flow path of the air conditioning unit, and as shown in fig. 4, the refrigerant circulates in the outdoor side without entering the indoor side. An S port of the four-way valve 2 is connected with a C port, a D port of the four-way valve 2 is connected with an E port, the second switch valve 9, the fourth switch valve 12 and the fifth switch valve 14 are disconnected, and the first switch valve 8 and the third switch valve 11 are closed. The refrigerant at the air outlet of the compressor 1 enters the second outdoor heat exchanger 7 through the first switch valve 8, then the refrigerant flowing out of the third port 73 of the second outdoor heat exchanger 7 is divided into two paths, one path enters the first outdoor electronic expansion valve 4, then enters the second port 72 of the second outdoor heat exchanger 7 through the four-way valve 2 and the third switch valve 11, and the refrigerant flowing out of the fourth port 74 enters the gas-liquid separator 6; the other path enters the second outdoor electronic expansion valve 10, then enters the second port 72 of the second outdoor heat exchanger 7, and the refrigerant flowing out of the fourth port 74 enters the gas-liquid separator 6.

Therefore, when the compressor 1 operates at high frequency and the four-way valve 2 is switched from refrigeration to heating, the high-pressure airflow generated by the operation of the high-frequency compressor 1 is prevented from entering an indoor connecting pipeline and colliding with a liquid refrigerant in the pipeline to generate noise, and meanwhile, the transmission of reversing noise to the indoor side is blocked.

Example 2

In a preferred embodiment 2 of the present invention, there is provided an air conditioning unit control method applied to the air conditioning unit in the above embodiment 1. Specifically, fig. 5 shows an alternative flowchart of the method, and as shown in fig. 5, the method includes the following steps S502-S504:

s502: after the air conditioning unit enters a defrosting mode, detecting whether the air conditioning unit meets a defrosting exit condition;

s504: and if the defrosting exit condition is met, controlling the air conditioning unit to enter an outdoor self-circulation mode, so that the refrigerant of the outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor.

In the above embodiment, an air conditioning unit capable of effectively reducing noise is provided, the air conditioning unit includes a first outdoor heat exchanger and a second outdoor heat exchanger, the second outdoor heat exchanger is respectively connected to an outdoor electronic expansion valve, a gas-liquid separator and an exhaust port of a compressor, and is configured to enter an outdoor self-circulation mode after defrosting is exited, so that a refrigerant of an outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor, and a problem that an air flow noise caused by reversing when an operation mode of the air conditioning unit is switched after defrosting is completed and an indoor noise caused by an impact sound between a high-pressure air flow and a liquid fluid in an inner side pipeline are relatively large is avoided.

Wherein, control air conditioning unit gets into outdoor self-loopa mode, includes: and an S port of the four-way valve is connected with a C port, a D port of the four-way valve is connected with an E port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be disconnected, and the first switch valve and the third switch valve are controlled to be closed. Fig. 4 shows a refrigerant flow path diagram of the outdoor self-circulation mode.

After controlling the air conditioning unit to enter the outdoor self-circulation mode, the method further comprises the following steps: detecting the ratio of the exhaust pressure and the suction pressure of the compressor; and when the ratio is smaller than a preset threshold value, controlling the air conditioning unit to enter a heating mode.

Before the air conditioning unit operates the defrosting mode, the method further comprises the following steps: controlling the air conditioning unit to enter a heating mode; after the air conditioning unit enters a heating mode, detecting whether the air conditioning unit meets defrosting entry conditions; and if the defrosting entering condition is met, controlling the air conditioning unit to enter a defrosting mode.

Wherein, control air conditioning unit and get into the mode of heating, include: controlling an S port of the four-way valve to be connected with a C port, controlling a D port of the four-way valve to be connected with an E port, controlling the second switch valve, the fourth switch valve and the fifth switch valve to be closed, and controlling the first switch valve and the third switch valve to be disconnected; fig. 2 shows a refrigerant flow path diagram in the heating mode.

Controlling an air conditioning unit to enter a defrosting mode, comprising: and an S port of the four-way valve is connected with an E port, a D port of the four-way valve is connected with a C port, the second switch valve, the fourth switch valve and the fifth switch valve are controlled to be closed, and the first switch valve and the third switch valve are controlled to be disconnected. Fig. 4 shows a refrigerant flow path diagram in the cooling mode.

In a preferred embodiment 2 of the present invention, another air conditioning unit control method is further provided, and specifically, fig. 6 shows an optional flowchart of the method, and as shown in fig. 6, the method includes the following steps S601-S606:

s601: heating operation; during heating operation, defrosting may be needed;

s602: judging whether defrosting entry conditions are met; the defrosting entering condition can be in various modes, for example, whether to enter defrosting is determined according to parameters such as the frosting condition, the unit running time or the superheat degree; if the defrosting entry condition is met, the step S603 is entered, otherwise, the heating operation is continued;

s603: refrigerating operation; during refrigeration operation, the outdoor heat exchanger is used as a condenser for heat dissipation, so that a defrosting effect is achieved;

s604: judging whether defrosting exit conditions are met; if the temperature is not satisfied, the refrigeration operation is continued, and if the temperature is satisfied, the operation enters S605, and the system is switched to an outdoor self-circulation mode;

s605: outdoor self-circulation; after the defrosting is finished, the air conditioning unit enters an outdoor self-circulation mode, and a refrigerant is self-circulated outdoors, so that the problem of high indoor noise caused by switching of the operation mode after the defrosting of the air conditioning unit is finished is solved;

s606: judging whether the ratio of the exhaust pressure to the suction pressure reaches a threshold value; if so, exiting the outdoor self-circulation and entering S601 heating operation; otherwise, continuing the operation of the outdoor self-circulation mode in S605.

In this way, after the defrosting operation is finished, the outdoor self-circulation mode is entered, the refrigerant of the outdoor unit exchanges heat in the refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor, the problem that the indoor noise caused by impact sound between high-pressure airflow and liquid fluid in the inner side pipeline is large when the operation mode is converted after the defrosting operation of the air conditioning unit is finished is solved, the noise of the indoor unit is effectively reduced when the operation mode is converted after the defrosting operation of the air conditioning unit is finished, and the comfort and the experience of a user are improved.

Example 3

Based on the air conditioning unit control method provided in embodiment 2 above, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.

In the above embodiment, an air conditioning unit capable of effectively reducing noise is provided, the air conditioning unit includes a first outdoor heat exchanger and a second outdoor heat exchanger, the second outdoor heat exchanger is respectively connected to an outdoor electronic expansion valve, a gas-liquid separator and an exhaust port of a compressor, and is configured to enter an outdoor self-circulation mode after defrosting is exited, so that a refrigerant of an outdoor unit exchanges heat in a refrigerant circulation pipeline formed by the first outdoor heat exchanger, the second outdoor heat exchanger and the compressor, and a problem that an air flow noise caused by reversing when an operation mode of the air conditioning unit is switched after defrosting is completed and an indoor noise caused by an impact sound between a high-pressure air flow and a liquid fluid in an inner side pipeline are relatively large is avoided.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.