Two-stage screw compressor

A screw compressor and compression mechanism technology, applied in the direction of rotary piston machinery, mechanical equipment, machine/engine, etc., can solve the problems of increasing the weight of the casting, not considering the increase of noise, and the complexity of the shape of the casting, etc., to achieve a simple structure , Prevention of internal resonance, noise reduction effect
CN1892039AInactive Publication Date: 2007-01-10HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
Publication Date
2007-01-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A two-stage screw compressor of the invention includes a low pressure stage casing provided with a low pressure stage compression mechanism, a discharge casing provided on a discharge side of the low pressure stage casing, a high pressure stage casing provided with a high pressure stage compression mechanism, and intermediate stage casings for connecting the discharge casing and the high pressure stage casing, and accommodating an electric motor. In such a two-stage screw compressor, a cavity is formed on a discharge casing side in the slide valve so as to enlarge the capacity of a discharge space formed in the discharge casing. Thereby, internal resonance occurring in the discharge casing is prevented.
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Description

technical field

[0001] The present invention relates to a two-stage screw compressor for use in screw refrigerators and the like. Background technique

[0002] The noise spectrum generated by the screw compressor is known as follows: the product of the number of teeth of the convex rotor and the rotation frequency is the fundamental frequency, and the fundamental frequency and its high harmonic components become obvious peaks. As a method of reducing this noise, there are measures such as attaching a sound-absorbing material to the casing, making the casing double-structured to improve sound insulation performance, or adding ribs to the casing to increase the rigidity of the casing. In a single-stage single-screw compressor, as disclosed in Patent Document 1, in order to reduce noise, a resonance space is provided inside the slide valve, and the resonance space communicates with the compression space to reduce noise.

[0003] Patent Document 1: Japanese Patent Laid-Open No....

Claims

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