CN115854502A - Oil return control method for starting multi-connected air conditioner low-temperature freezer - Google Patents
Oil return control method for starting multi-connected air conditioner low-temperature freezer Download PDFInfo
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- CN115854502A CN115854502A CN202211556135.7A CN202211556135A CN115854502A CN 115854502 A CN115854502 A CN 115854502A CN 202211556135 A CN202211556135 A CN 202211556135A CN 115854502 A CN115854502 A CN 115854502A
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Abstract
The invention discloses an oil return control method for starting a low-temperature freezer of a multi-connected air conditioner, which comprises the following steps of: (1) receiving a starting-up instruction; (2) Starting a compressor, starting a heating valve, and starting an oil return electromagnetic valve; (3) In the time T1, and the exhaust superheat degree of the compressor is less than delta 1, the compressor operates at the highest frequency of 50Hz; (4) Detecting whether the exhaust superheat degree of the compressor is larger than delta 1, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F1, detecting whether the exhaust superheat degree of the compressor is larger than delta 2 after the compressor operates for T2 time, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F2, and executing the step (5) after the compressor operates for T3 time; (5) The compressor and valves are adjusted according to normal logic. The oil return control method is beneficial to enabling system lubricating oil to fully and quickly return to the compressor, and ensures that the compressor is fully and well lubricated when being started.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an oil return control method for a multi-connected air conditioner during starting of a low-temperature freezer.
Background
Under the condition of low ring temperature, the outdoor unit of the traditional multi-connected air conditioner has lower ambient temperature, when the compressor is stopped, the refrigerant can migrate to the side with lower temperature, and along with the longer stop time, the more the refrigerant migrates, the compressor can lack oil, and further the compressor can be damaged due to oil shortage. Especially for a system with a multi-connected long connecting pipe, oil shortage is more likely to occur, so that the compressor is damaged. Therefore, a scheme is needed to be provided specifically, which can enable the compressor to return oil quickly when the multi-split air conditioner low-temperature freezer is started, and avoid the compressor from being damaged due to oil shortage.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an oil return control method for a multi-connected air conditioner during starting of a low-temperature freezer, and aims to solve the technical problem that a compressor is lack of oil during starting of the multi-connected air conditioner in the prior art.
In order to achieve the purpose, the invention adopts the following technical method:
an oil return control method for a multi-connected air conditioner low-temperature freezer during starting comprises the following steps:
(1) Receiving a starting-up instruction;
(2) Starting a compressor, starting a heating valve, and starting an oil return electromagnetic valve;
(3) Starting the compressor within T1 time, wherein the discharge superheat degree of the compressor is less than delta 1, and then the compressor operates at the highest frequency of 50Hz;
(4) Detecting whether the exhaust superheat degree of the compressor is larger than delta 1, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F1, detecting whether the exhaust superheat degree of the compressor is larger than delta 2 after the compressor operates for T2 time, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F2, and executing the step (5) after the compressor operates for T3 time; the delta 2 is more than the delta 1, and the F2 is more than the F1;
(5) The compressor and the valves are adjusted according to normal logic;
(6) Shutting down;
(7) The compressor and fan stop working.
Further, in step (3), T1 was 12 minutes.
Further, in step (3), Δ 1 was 15 ℃.
Further, in the step (4), F1 is 30Hz.
Further, in step (4), T2 was 1 minute.
Further, in step (4), Δ 2 was 10 ℃.
Further, in step (4), T3 is 30 seconds.
Further, in the step (4), F2 is the lowest operating frequency of the compressor.
Further, in the step (5), the oil return electromagnetic valve is closed.
Has the advantages that: compared with the prior art, the oil return control method for the low-temperature freezer of the multi-connected air conditioner provided by the invention takes the exhaust superheat degree of the compressor as a reference, and is beneficial to enabling system lubricating oil to fully and quickly return to the compressor by controlling the rotating speed of the compressor and the opening and closing of the heating valve and the oil return electromagnetic valve, so that the full and good lubrication of the compressor during the starting is ensured, the safety of the compressor is ensured, the stability of the system is improved, and the damage caused by the oil shortage of the compressor during the starting of the low-temperature freezer of the compressor is avoided.
Drawings
Fig. 1 is a control flow chart of an oil return control method when a multi-connected air conditioner low-temperature freezer provided by the invention is started.
Fig. 2 is a system schematic diagram of a multi-connected air conditioner.
Detailed Description
The invention provides an oil return control method for starting a low-temperature freezer of a multi-connected air conditioner, which is further described in detail below in order to make the purpose, technical method and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides an oil return control method for starting a low temperature freezer of a multi-connected air conditioner. The direction of the arrows in fig. 2 indicates the direction of flow of the refrigerant. Fig. 2 shows a cooling mode, and since the switching between air conditioning and heating is normally prior art, a drawing is not separately drawn herein to show the flow direction of the refrigerant in the heating mode.
The oil return control method for the starting of the low-temperature freezer of the multi-connected air conditioner comprises the following steps of:
(1) Receiving a starting-up instruction;
(2) Starting a compressor, starting a heating valve, and starting an oil return electromagnetic valve;
(3) Starting the compressor within T1 time, wherein the discharge superheat degree of the compressor is less than delta 1, and then the compressor operates at the highest frequency of 50Hz;
(4) Detecting whether the exhaust superheat degree of the compressor is larger than delta 1, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F1, detecting whether the exhaust superheat degree of the compressor is larger than delta 2 after the compressor operates for T2 time, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F2, and executing the step (5) after the compressor operates for T3 time; the delta 2 is more than the delta 1, and the F2 is more than the F1;
(5) The compressor and each valve are adjusted according to normal logic;
(6) Shutting down;
(7) The compressor and fan stop working.
Preferably, in step (3), T1 is 12 minutes.
Preferably, in step (3), Δ 1 is 15 ℃.
Preferably, in step (4), F1 is 30Hz.
Preferably, in step (4), T2 is 1 minute.
Preferably, in step (4), Δ 2 is 10 ℃.
Preferably, in step (4), T3 is 30 seconds.
Preferably, in the step (4), F2 is the lowest operating frequency of the compressor.
Preferably, in the step (5), the oil return electromagnetic valve is closed.
For ease of understanding, referring further to fig. 2, fig. 2 schematically illustrates a system schematic diagram of a multi-connected air conditioner, in which only the components relevant to the present application are shown, and the drawings are not shown and explained for other common components of the air conditioner (such as various valves, pipes, filters, sensors, etc.).
As shown in fig. 2, the evaporator is an indoor unit, and the condenser, the compressor, and the like are located outdoors. Under the normal operation condition, the oil return electromagnetic valve is in a closed state.
When the exhaust superheat degree is low, the oil extraction rate is high, the compressor is easy to lack oil, the compressor is easy to be subjected to liquid impact, the compressor is damaged, and the compressor needs to be returned as soon as possible. . Therefore, within 12 minutes after the compressor is started, the discharge superheat degree of the compressor is less than 15 ℃, and the compressor operates at the highest frequency of 50Hz. The heating valve is opened, and the oil return electromagnetic valve is opened. The refrigerant at the outlet of the compressor 1 enters the oil separator 2, and the oil separated by the oil separator returns to the compressor after passing through the oil return electromagnetic valve 9. The gaseous refrigerant separated by the oil separator enters the condenser, passes through the heating valve 8, then enters the evaporator 4, enters the gas-liquid separator 5 and then returns to the compressor.
Detecting whether the exhaust superheat degree of the compressor is larger than 15 ℃, if so, switching to normal logic regulation, if not, reducing the frequency of the compressor to 30Hz, detecting whether the exhaust superheat degree of the compressor is larger than 10 ℃ after running for 1 minute, if so, switching to normal logic regulation, otherwise, reducing the frequency of the compressor to the lowest frequency, then running for 30 seconds, and then switching to normal logic regulation.
The compressor and the valves are adjusted according to normal logic; at this time, the oil return solenoid valve is closed (oil is returned through the oil return capillary tube 92), and the heating valve is opened or not depending on the actual situation (cooling or heating mode).
It should be noted that the claimed application is a control method, not a system structure of an air conditioner, fig. 2 is only for easy understanding, and in practical application, the structure of a multi-split air conditioner is not limited to that shown in fig. 2.
In practical application, a temperature sensor and a pressure sensor (not shown in the figure) are arranged on the compressor exhaust pipeline and used for monitoring and calculating the compressor exhaust superheat degree.
Through the analysis, compared with the prior art, the compressor lubricating oil recovery device disclosed by the invention takes the exhaust superheat degree of the compressor as a reference, and the system lubricating oil can be conveniently and fully and quickly returned to the compressor by controlling the rotating speed of the compressor, the opening and closing of the heating valve and the oil return electromagnetic valve, so that the sufficient and good lubrication of the compressor during starting is ensured, the safety of the compressor is ensured, the stability of the system is improved, and the damage caused by the oil shortage of the compressor during starting of the low-temperature freezer of the compressor is avoided.
It will be understood that those skilled in the art can make equivalents and changes in the technical means and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of the present invention.
Claims (9)
1. An oil return control method for a multi-connected air conditioner low-temperature freezer during starting is characterized by comprising the following steps:
(1) Receiving a starting-up instruction;
(2) Starting a compressor, starting a heating valve, and starting an oil return electromagnetic valve;
(3) Starting the compressor within T1 time, wherein the discharge superheat degree of the compressor is less than delta 1, and then the compressor operates at the highest frequency of 50Hz;
(4) Detecting whether the exhaust superheat degree of the compressor is larger than delta 1, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F1, detecting whether the exhaust superheat degree of the compressor is larger than delta 2 after the compressor operates for T2 time, if so, executing the step (5), otherwise, reducing the frequency of the compressor to F2, and executing the step (5) after the compressor operates for T3 time; the delta 2 is less than the delta 1, and the F2 is less than the F1;
(5) The compressor and each valve are adjusted according to normal logic;
(6) Shutting down;
(7) The compressor and fan stop working.
2. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (3), T1 is 12 minutes.
3. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (3), Δ 1 is 15 ℃.
4. The oil return control method when the multi-connected air conditioner low-temperature freezer is started up, according to claim 1, wherein in the step (4), F1 is 30Hz.
5. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (4), T2 is 1 minute.
6. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (4), Δ 2 is 10 ℃.
7. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (4), T3 is 30 seconds.
8. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, wherein in the step (4), F2 is the lowest operating frequency of the compressor.
9. The oil return control method for the multi-connected air conditioner low-temperature freezer according to claim 1, characterized in that in the step (5), the oil return electromagnetic valve is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211556135.7A CN115854502A (en) | 2022-12-06 | 2022-12-06 | Oil return control method for starting multi-connected air conditioner low-temperature freezer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211556135.7A CN115854502A (en) | 2022-12-06 | 2022-12-06 | Oil return control method for starting multi-connected air conditioner low-temperature freezer |
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| Publication Number | Publication Date |
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| CN115854502A true CN115854502A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211556135.7A Pending CN115854502A (en) | 2022-12-06 | 2022-12-06 | Oil return control method for starting multi-connected air conditioner low-temperature freezer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117450693A (en) * | 2023-12-25 | 2024-01-26 | 珠海格力电器股份有限公司 | Compressor oil return control method and device, computer equipment and storage medium |
| WO2025066313A1 (en) * | 2023-09-25 | 2025-04-03 | 珠海格力电器股份有限公司 | Air conditioner control method and air conditioner |
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2022
- 2022-12-06 CN CN202211556135.7A patent/CN115854502A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025066313A1 (en) * | 2023-09-25 | 2025-04-03 | 珠海格力电器股份有限公司 | Air conditioner control method and air conditioner |
| CN117450693A (en) * | 2023-12-25 | 2024-01-26 | 珠海格力电器股份有限公司 | Compressor oil return control method and device, computer equipment and storage medium |
| CN117450693B (en) * | 2023-12-25 | 2024-05-03 | 珠海格力电器股份有限公司 | Compressor oil return control method and device, computer equipment and storage medium |
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