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Screw compressor

A screw compressor, screw technology, applied in mechanical equipment, machines/engines, rotary piston machines, etc., can solve problems such as natural vibration frequencies that cannot be avoided

Active Publication Date: 2014-01-29
코벨코컴프레서가부시키가이샤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As long as the motor is a cantilever structure, the problem of low natural vibration frequency cannot be avoided
For example, even a screw compressor equipped with a motor capable of operating at a rotational speed higher than 7000 rpm has the following problem: when the critical speed (natural vibration frequency) is 7000 rpm, it cannot be operated at a rotational speed higher than 7000 rpm

Method used

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Embodiment Construction

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] figure 1 It is a schematic diagram of the screw rotors 11a, 11b and the rotors 12a, 19a of the motors 12, 19 of the screw compressor (hereinafter simply referred to as a compressor) of the present invention.

[0023] The compressor has a male screw rotor 11a and a female screw rotor 11b which are interlocked. The rotor shafts extending to both ends of the male and female screw rotors 11 a and 11 b are supported by bearings 14 , respectively. The rotor 12a of the first motor 12 and the rotor 19a of the second motor 19 are directly connected to the tip sides of the rotor shafts 15a, 15b extending to both sides of the male rotor 11a, respectively. The male rotor 11a is driven by the interaction of the magnetic fields generated by the stators provided on the motor casings of the first motor 12 and the second motor 19 (not shown) and the rotors 12a, 19a to obtain r...

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Abstract

The screw compressor includes screw rotors to be driven by the motors to mesh with each other in male-female relation, and the plurality of motors whose outputs in total are not smaller than the output of a single motor required for driving the screw rotors, the plurality of motors having rotors connected directly to rotor shafts of the screw rotors. It actualizes the operation in a high rotation region by increasing the critical speeds (the natural frequencies) of the motors without lowering the outputs.

Description

technical field [0001] The invention relates to a screw compressor. Background technique [0002] Such as Figure 4 As shown, Japanese Patent Application Laid-Open No. 2004-343857 discloses a screw compressor in which the rotor shaft 101 of one of the screw rotors 103 is extended in the screw rotors 103 and 103 in which the rotor shaft 101 is supported by a bearing 102 and which is interlocked with male and female. , the rotor 104 of the motor that drives the screw rotor 103 is directly connected to the rotor shaft 101 . In such a screw compressor, since a coupling for connecting the output shaft of the motor and the rotor shaft of the screw rotor is unnecessary, centering of the shaft is not required, and the structure can be simplified. [0003] However, in such a structure, when the screw rotor 103 supported on both sides can be regarded as a rigid body, the rotor 104 of the motor has a cantilever structure supported on one side. The natural vibration frequency of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/16
Inventor 吉村省二中村元
Owner 코벨코컴프레서가부시키가이샤