Variable displacement motor, air conditioner compressor hydraulic driving system and control method

Abstract

The invention belongs to the field of air conditioner control of excavators, and particularly relates to a variable displacement motor which comprises a servo oil cylinder, a motor body, a servo reversing valve and a proportional valve. An oil inlet of the servo reversing valve and an oil inlet of the proportional valve are both connected to an E port of the variable displacement motor, an oil outlet of the proportional valve is connected with a control port C of the servo reversing valve, one working oil port of the servo reversing valve is connected with the max end of the servo oil cylinder, and the other working oil port of the servo reversing valve is connected with the min end of the servo oil cylinder. The max end of the servo oil cylinder is connected with a variable displacement mechanism of the motor, and the motor is communicated between a P port of the variable displacement motor and a T port of the variable displacement motor. The speed sensor is used for acquiring the rotating speed of the output shaft of the motor. Adjustment of the motor is achieved through control of the proportional valve, the servo oil cylinder and the speed sensor, the air conditioner compressor hydraulic driving system adopting the variable displacement motor can prevent the air conditioner compressor from being affected by oil pressure fluctuation, and the service life of the air conditioner compressor is prolonged.

Description

technical field [0001] The invention belongs to the field of air conditioning control of excavators, and in particular relates to a hydraulic drive system of a variable motor and an air conditioner compressor and a control method. Background technique [0002] When the existing hydraulic excavator uses a hydraulic motor to drive the air conditioner compressor, it is usually directly connected to the motor through the main oil circuit, and then the motor drives the air conditioner compressor. The speed of the air conditioner compressor is affected by oil pressure fluctuations, and the speed of the air conditioner compressor varies greatly. It is easy to cause damage to the air conditioner compressor. Moreover, there is no speed sensor in the air-conditioning compressor control system, so it is impossible to judge whether the air-conditioning compressor is working normally. After the system is started, the hydraulic motor keeps rotating, and the start and stop of the hydrauli...

AI Technical Summary

Problems solved by technology

[0002]When existing hydraulic excavators use hydraulic motors to drive air-conditioning compressors, they are usually directly connected to the motor through the main oil circuit, and then the motor drives the air-conditioning compressor. The speed of the machine is affected by the fluctuation of oil pressure, and the speed of the air conditioner compressor changes greatly, which may easily cause damage to the air conditioner compressor

Moreover, there is no speed sensor in the air-conditioning compressor control system, so it is impossible to judge whether the air-conditioning compressor is working normally

After the system is started, the hydraulic motor keeps rotating, and the start and stop of the hydraulic motor cannot be controlled according to the situation

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