Screw compressor having slide valve with flexible volume ratio

Abstract

The invention discloses a screw compressor having a slide valve with flexible volume ratio, and the screw compressor comprises a housing, a screw rod, an air suction port, an air exhaust port, a slide valve, a first cylinder and a second cylinder, wherein the slide valve is arranged between the first cylinder and the second cylinder; the slide valve comprises a slide valve main body, and a first end surface and a second end surface are respectively arranged at two ends of the slide valve main body; the first end surface and the second end surface are respectively used for sealing the first cylinder and the second cylinder; the first cylinder is connected with the air exhaust port of the compressor through a first connecting pipe; the second cylinder is connected with a last closed screw groove through a second connecting pipe; and the slide valve can find the balance under the drive of pressure in the first cylinder and pressure in the second cylinder. The screw compressor having the slide valve with the flexible volume ratio can automatically regulate the volume ratio of the compressor to the optimal state, thereby reducing the power consumption and noise.

Description

technical field [0001] The invention belongs to the technical field of compressors, and relates to a screw compressor, in particular to a screw compressor with a flexible volume ratio slide valve. Background technique [0002] The twin-screw compressor consists of a pair of parallel, intermeshing female and male screws, and is the most widely used type of rotary compressor. [0003] The indicator diagram of the screw compressor under ideal working conditions is as follows: figure 1 As shown, the shaded part represents the power consumption of one cycle. However, when the actual working condition of the screw compressor is different from the ideal working condition (especially if the difference is large), the pressure at the end of compression cannot match the exhaust pressure, and it is easy to produce overcompression (delayed opening, excessive compression) or undercompression (advance open, undercompression). Under ideal working conditions, the volume ratio of the screw...

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Problems solved by technology

[0004] see figure 2 , figure 2 It is the indicator diagram of the overcompression of the screw compressor. In the case of overcompression, the screw compressor consumes more work; in addition, when the screw compressor is turned on, because the pressure in the screw channel of the screw compressor The pressure outside is high and the noise will increase

[0005] see image 3 , image 3 It is the indicator diagram of the undercompression of the screw compressor. In the case of undercompression, the screw compressor will also consume a part of work; in addition, when the screw compressor is turned on, due to the pressure in the screw groove of the screw compressor The pressure is lower than the outside pressure, the outside gas will enter the screw compressor, and the noise will also increase

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