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Oil return control method of inverter compressor and air conditioner

A variable frequency compressor and oil return control technology, which is applied in the field of oil return control of variable frequency compressors and air conditioners, can solve the problems of high oil discharge rate of compressors, lack of oil in compressors, etc., to avoid wear and solve high frequency return poor oil effect

Pending Publication Date: 2022-01-21
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention discloses an oil return control method of an inverter compressor and an air conditioner, which mainly solves the problem of lack of oil in the compressor due to the high oil discharge rate of the compressor under the condition of high frequency operation

Method used

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  • Oil return control method of inverter compressor and air conditioner
  • Oil return control method of inverter compressor and air conditioner
  • Oil return control method of inverter compressor and air conditioner

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Embodiment approach 2

[0078] In the second embodiment, the frequency reduction of the high-frequency operating frequency f of the compressor is carried out, instead of directly reducing the frequency of the compressor from the current high-frequency operating frequency f to the fixed compressor preset frequency F in the first embodiment, but at On the basis of the high-frequency operating frequency f of the compressor, the frequency is reduced step by step, so as to avoid fluctuations or abnormalities caused by excessive frequency reduction of the high-frequency operating frequency f of the compressor.

[0079] Specifically, in this embodiment, the high-frequency operating frequency f of the compressor is controlled to reduce the first preset frequency reduction Δf, and then judge whether the frequency requirement for oil return is met, and then reduce the second preset frequency reduction Δf step by step if it is not satisfied 1 , until the frequency that satisfies oil return is reached, since Δf>Δ...

Embodiment 1

[0117] see figure 1 As shown, the oil return control method of the inverter compressor in this embodiment includes:

[0118] Step 01, the compressor is started according to the preset program.

[0119] The starting mode of the compressor is started according to the original preset program, which can be a variety of starting modes such as normal speed start, fast start, overload start, etc.

[0120] Step 02, the compressor runs stably.

[0121] The compressor runs to the target frequency and runs stably according to the original setting procedure.

[0122] Step 03, judging whether the oil return condition for frequency reduction is satisfied. Obtain the stable operating frequency f at this time, and judge whether f exceeds the preset high-frequency oil return judgment frequency F. If f>F, and the stable operation time t exceeds the preset time T, it indicates that the frequency reduction oil return condition has been met at this time , go to the next step, otherwise go to s...

Embodiment 3

[0135] see image 3 As shown, the difference between the oil return control method of the inverter compressor in this embodiment and the second embodiment lies in the different conditions for judging the completion of oil return in step 16 . Embodiment 1 By judging whether the running time t1 exceeds the preset oil return time T1 (such as Figure 5 ), the present embodiment judges whether the oil return is completed by the temperature change of the inner pipe (such as Figure 6 ). If after the oil return program is executed, the inner pipe temperature drop value Δt inner pipe exceeds the set temperature difference ΔT inner pipe, indicating that the frequency reduction at this time has a greater impact on the temperature change of the inner pipe, which may affect the outlet air temperature, thereby affecting indoor comfort property, exit the oil return at this time. If the Δt inner tube ≤ ΔT inner tube, it means that the temperature drop of the inner tube is within the accep...

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Abstract

The invention discloses an oil return control method of an inverter compressor and an air conditioner. The oil return control method of the inverter compressor comprises the following steps that the compressor is started to operate; the high-frequency operation duration t of the compressor is obtained, and when the high-frequency operation duration t meets the condition that t is greater than or equal to T, and T is the preset duration representing oil shortage in the compressor, an oil return program for reducing the operation frequency of the compressor is executed; and whether an oil return completion condition is met in the execution process of the oil return program, if so, the oil return program is quitted, and if not, the oil return program is continuously executed. According to the oil return control method of the inverter compressor and the air conditioner, the problem of oil shortage in the compressor caused by high oil output rate of the compressor under the condition of high-frequency operation is mainly solved, the compressor executes a frequency reduction oil return program after high-frequency stable operation exceeds the set time T, so that more sufficient oil in the compressor is maintained, and abrasion caused by long-time oil shortage is avoided.

Description

technical field [0001] The invention relates to the technical field of refrigeration and air conditioning, in particular to an oil return control method of an inverter compressor and an air conditioner. Background technique [0002] The operating frequency of the variable frequency compressor system can be adjusted according to the environmental load. When the environmental load is low, the compressor operates at low frequency for a long time and needs to be periodically increased to return oil. When the environmental load is high, the compressor maintains a high frequency operation. When the oil return situation is lower frequency operation has improved. When the compressor maintains high frequency and stable operation, the oil discharge volume and oil return volume will maintain a dynamic balance to ensure that there is sufficient oil volume in the oil pool of the compressor for lubrication. However, under certain working conditions (such as ultra-low temperature heating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/30F24F11/61F24F11/64F24F11/70F24F110/10
CPCF24F11/30F24F11/61F24F11/64F24F11/70F24F2110/10
Inventor 冉明士王喜成车雯于琦杨伟刘永强
Owner GREE ELECTRIC APPLIANCES INC
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