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Frequency conversion unit and oil return control method and device thereof

A frequency conversion unit and oil return control technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as cooling loss, reduce cooling loss and ensure the reliability of oil return.

Active Publication Date: 2019-09-24
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a frequency conversion unit and its oil return control method and device to at least solve the problem of cooling capacity loss caused by the high-pressure and low-pressure sides of the unit passing through the oil return capillary during the high-frequency operation of the frequency conversion refrigeration unit in the prior art. question

Method used

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  • Frequency conversion unit and oil return control method and device thereof
  • Frequency conversion unit and oil return control method and device thereof
  • Frequency conversion unit and oil return control method and device thereof

Examples

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Embodiment 1

[0028] The oil return control method of the frequency conversion unit provided by the present invention will be described below in conjunction with the accompanying drawings.

[0029] The oil return control method of frequency conversion unit provided by the present invention can be applied to frequency conversion unit equipment, such as: household frequency conversion air conditioners, frequency conversion air conditioners on shopping malls or ships, etc., can be implemented by installing software on the equipment or on the main controller of the unit It is realized by writing the corresponding control program above, such as figure 1 As shown, the oil return control method of the frequency conversion unit may include the following steps S102-S106:

[0030] S102, obtaining the actual operating frequency Fs of the frequency conversion unit;

[0031] S104, comparing the acquired actual operating frequency Fs with the preset optimal oil return frequency Fy of the unit, and deter...

Embodiment 2

[0044] Based on the oil return control method of the frequency conversion unit provided in the above embodiment 1, the optional embodiment 2 of the present invention also provides a frequency conversion unit, specifically, figure 2 An optional schematic diagram showing the structure of the frequency conversion unit, such as figure 2 As shown, the frequency conversion unit includes:

[0045] A compressor, the compressor has an exhaust port and an air return port;

[0046] Oil separator (oil separation), the first interface of the oil separator is connected to the exhaust port of the compressor, and the second interface of the oil separator is connected to the air return port of the compressor;

[0047] a condenser, the first end of the condenser is connected to the third interface of the oil separator;

[0048] An evaporator, the first end of the evaporator is connected to the second end of the condenser, and the second end of the evaporator is connected to the air return p...

Embodiment 3

[0054] Based on the oil return control method of the frequency conversion unit provided in the above embodiment 1, the optional embodiment 3 of the present invention also provides an oil return control device for the frequency conversion unit, specifically, image 3 shows an optional structural block diagram of the device, such as image 3 As shown, the oil return control device of the frequency conversion unit includes: an acquisition unit 32 for acquiring the actual operating frequency Fs of the frequency conversion unit; a comparison unit 34 connected to the acquisition unit 32 for comparing the acquired actual operating frequency Fs with the unit preset The optimal oil return frequency Fy is compared to determine the degree of deviation between the actual operating frequency Fs and the optimal oil return frequency Fy; the control unit 36 ​​is connected with the comparison unit 34, and is used to generate a flow for controlling the oil return solenoid valve of the frequency ...

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Abstract

The invention discloses a frequency converter set and an oil return control method and device. The oil return control method comprises the following steps: acquiring the actual operating frequency of the frequency converter set; comparing the acquired actual operating frequency with the preset optimum oil return frequency of the frequency converter set to determine the deviation degree between the actual operating frequency and the optimum oil return frequency; and enabling a control signal for controlling the on / off of an oil return electromagnetic valve of the frequency converter set to be generated according to the deviation degree, so as to control the oil return of the frequency converter set. According to the frequency converter set and the oil return control method and device, the oil return reliability of the frequency converter set is ensured, and the cooling loss caused by gas backflow between the high pressure side and the low pressure side of the frequency converter set through oil return capillary tubes during the high frequency operating process is reduced.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a frequency conversion unit and an oil return control method and device thereof. Background technique [0002] At present, if the amount of refrigerant poured into the frequency conversion refrigeration unit is large, it will cause less oil or lack of oil in the compressor, resulting in a decrease in the reliability of the compressor. The unit is equipped with an oil separator, which can return the refrigerated oil discharged with the exhaust to the suction port of the compressor through the capillary tube, effectively ensuring the oil return reliability of the refrigeration system and improving the service life of the compressor. However, the oil return capillary connects the suction port and the exhaust port of the compressor. When the unit is operating at high frequency, the gas on the high-pressure side is more likely to flow to the low-pressure side along with the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02
Inventor 杨虹卫广穹李金奎
Owner GREE ELECTRIC APPLIANCES INC
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