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Air conditioner compressor minimum operating frequency control method and control device

An air-conditioning compressor and operating frequency technology, applied in heating and ventilation control systems, refrigerators, heating methods, etc., can solve problems such as insufficient compression ratio improvement, prevent poor oil return, prolong service life, reduce The effect of loss

Active Publication Date: 2020-04-07
SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is completed in order to solve the above problems. Its purpose is to provide a method and control device for controlling the minimum operating frequency of an air conditioner compressor. By controlling the minimum operating frequency of the compressor, it is possible to prevent the The compression ratio is too low, and the problem of insufficient increase in the compression ratio when reducing the opening of the electronic expansion valve is compensated, and, during heating operation, it prevents the compressor exhaust temperature from being too low due to the low outdoor temperature, and Make up for the problem of insufficient exhaust gas temperature rise when reducing the opening of the electronic expansion valve

Method used

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  • Air conditioner compressor minimum operating frequency control method and control device
  • Air conditioner compressor minimum operating frequency control method and control device
  • Air conditioner compressor minimum operating frequency control method and control device

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Embodiment 1

[0035] Figure 4 is a graph showing the outdoor temperature-compressor minimum operating frequency function during cooling operation according to the first embodiment, Figure 5 It is a graph showing the outdoor temperature-compressor minimum operating frequency function during heating operation according to the first embodiment.

[0036] Such as Figure 4 As shown, when the operation mode detection unit 13 receives the control signal about the air-conditioning operation mode from the air-conditioning controller 8 and determines that the air-conditioning operation mode is cooling operation, it compares with the temperature detection unit 10 according to the following piecewise function. Calculate the minimum operating frequency of the compressor corresponding to the detected outdoor temperature:

[0037] f min =F 1 T a 1

[0038] f min =F 2 T 1 ≤T a 2

[0039] f min =F 3 T a ≥T 2

[0040] Among them, F min is the minimum operating frequency of the compresso...

Embodiment 2

[0048] Figure 6 is a graph showing the outdoor temperature-compressor minimum operating frequency function during cooling operation according to the second embodiment, Figure 7 It is a graph showing the outdoor temperature-compressor minimum operating frequency function during heating operation according to the second embodiment.

[0049] Such as Figure 6 As shown by the arrow, when the air conditioner operating mode is cooling operation, when the outdoor temperature drops from high temperature to low temperature, the minimum operating frequency of the compressor is F min respectively at the outdoor temperature T a become T 2 and T 1 when making changes. However, in Example 2, when the outdoor temperature rises from a low temperature to a high temperature, the minimum operating frequency of the compressor is F min at outdoor temperature T a more than T n Change after +T, where T is the temperature hysteresis value, n=1,2.

[0050] Additionally, if Figure 7 As sho...

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Abstract

The invention discloses a minimum operation frequency control method and a control device of an air conditioner compressor; and as the minimum operation frequency of the compressor is controlled, thelower compression ratio caused by lower outdoor temperature is prevented in the refrigerating operation, and the lower exhaust temperature of the compressor caused by lower outdoor temperature is prevented in the heating operation. The control method comprises the steps of: a temperature detecting step for detecting the outdoor temperature of an air conditioner; a compressor minimum operation frequency calculating step for calculating the minimum compressor operation frequency corresponding to the outdoor temperature detected in the temperature detecting step according to the outdoor temperature-minimum compressor operation frequency functions; and a compressor minimum operation frequency updating step for updating the minimum operation frequency of the compressor of the air conditioner according to the minimum compressor operation frequency calculated in the compressor minimum operation frequency calculating step.

Description

technical field [0001] The invention relates to an air-conditioning system with cooling and heating functions, in particular to a method and a control device for controlling the minimum operating frequency of a compressor of the air-conditioning system. Background technique [0002] As an existing inverter air conditioner, the speed (frequency) of the compressor is generally controlled and adjusted by the frequency converter, and the cooling and heating speeds are adjusted according to changes in the indoor temperature, thereby achieving more accurate and comfortable temperature control. [0003] However, in the conventional inverter air conditioner like this, if the outdoor temperature becomes low during cooling operation, the compression ratio will be too low, and the pressure difference will be small at this time, which will easily cause the compressor to discharge the valve plate. An abnormal sound is produced. On the other hand, during heating operation, if the outdoor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/86F25B49/02F24F110/12
Inventor 武智良则柯一龙久保和也许双
Owner SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD