Slide valve loading and unloading structure capable of being accurately controlled, screw compressor and control method

Abstract

The invention discloses a slide valve loading and unloading structure capable of being accurately controlled, a screw compressor and a control method. The slide valve loading and unloading structure comprises a slide valve and a piston cylinder transmission mechanism. Two side cavities of a piston in the piston cylinder transmission mechanism communicate with the low-pressure air suction side andthe high-pressure air exhaust side of the compressor correspondingly. Electromagnetic valves are arranged on pipelines where the two side cavities of the piston communicate with the low-pressure air suction side and the high-pressure air exhaust side correspondingly. Due to the fact that refrigerating oil is introduced into the two side cavities of the piston, and the piston is pushed to move by utilizing the oil pressure difference of the two side cavities of the piston, so that the slide valve load is adjusted. As the oil cylinders on the two sides of the piston do not use gas, the problem of inaccurate slide valve loading due to leakage of gaseous refrigerants at the outer circle of the piston is effectively solved, the reliability of the compressor is improved, the load requirements ofall parts are met, and useless power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a slide valve loading and unloading structure capable of precise and reliable control, a screw compressor with the structure, and a control method for loading and unloading the screw compressor. Background technique [0002] Screw compressors generally use a slide valve or plunger structure inside the unit to adjust the compressor suction capacity. That is, the change of the capacity is realized by moving the slide valve to the set position. The structure that adopts the slide valve to adjust the capacity generally uses the pressure difference inside the compressor as the driving force for the slide valve to move. Such as figure 1 with Figure 5 As shown, an oil cylinder transmission mechanism 2 is arranged at the right end of the slide valve 1, and the left extended end of the piston rod in the transmission mechanism is connected with the right end of the slide valve 1, a...

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Problems solved by technology

[0008] In order to solve the problems of low stability and reliability of loading and unloading control of existing screw compressors and increased useless work, the present invention proposes a slide valve loading and unloading structure that can realize precise and reliable control, and screw compressors and screw compressors with this structure. Compressor loading and unloading control method

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