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Screw compressor

A screw compressor, screw technology, used in mechanical equipment, machines/engines, liquid fuel engines, etc., to prevent wear and damage

Inactive Publication Date: 2016-08-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, when the pressure in the compression chamber is lower than the pressure on the suction side when the operation is stopped, the star wheel is deformed so as to warp from the star wheel support provided on the back side to the compression chamber side, and the star wheel may be worn or damaged. Hidden dangers

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] The screw compressor according to Embodiment 1 will be described with reference to the drawings. In addition, the screw compressor is connected to a refrigeration circuit that circulates a refrigerant to perform a vapor compression refrigeration cycle.

[0030] figure 1 It is a schematic cross-sectional view of the screw compressor according to Embodiment 1 of the present invention. figure 2 It is a sectional view of main parts of the screw compressor according to Embodiment 1 of the present invention. In addition, in figure 1 , figure 2 In the drawings described later, the same or equivalent parts are assigned the same reference numerals, and this is common throughout the specification. In addition, the form of the component shown in the whole specification is an illustration only, and this invention is not limited to these descriptions.

[0031] The screw compressor 1 of Embodiment 1 is a single-screw compressor. Here, Embodiment 1 will be described by taking a...

Embodiment approach 2

[0080] Embodiment 2 relates to the opening and closing mechanism 30 different from the opening and closing mechanism 20 of Embodiment 1. FIG. Hereinafter, the differences between Embodiment 2 and Embodiment 1 will be mainly described. In addition, the modifications applied to the structural parts of the first embodiment are similarly applied to the same structural parts of the second embodiment. This also applies to the embodiments described later.

[0081] Figure 6 It is a sectional view of main parts of a screw compressor according to Embodiment 2 of the present invention, Figure 6 (a) shows the state where the suction chamber 11 and the cogging pressure chamber 12 are separated, Figure 6 (b) shows a state where the suction chamber 11 and the cogging pressure chamber 12 communicate.

[0082] In contrast to the opening and closing mechanism 20 of the first embodiment in which the opening and closing rod 22 operates in parallel to the screw shaft 4 to open and close the...

Embodiment approach 3

[0091] In the first embodiment, the communication path 14 is provided for communicating the suction chamber 11 and the alveolar pressure chamber 12, and the communication path 14 is opened and closed by the opening and closing mechanism 20, while in the third embodiment, the suction chamber 11 and the alveolar pressure chamber are constituted 12 disconnected constructs. In addition, it is configured such that only the refrigerant gas is introduced from the cogging pressure chamber 12 to the compression chamber 9 when the screw rotor 5 is reversed. Hereinafter, the differences between Embodiment 3 and Embodiment 1 will be mainly described.

[0092] Figure 7 It is a sectional view of main parts of the screw compressor according to Embodiment 3 of the present invention.

[0093] When the screw rotor 5 reverses after the screw compressor 1 stops running, in the compression chamber 9, the cogging pressure chamber 12 and the discharge chamber 10, while the pressure relationship o...

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PUM

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Abstract

A casing (2) comprises therein: a compression chamber (9); a suction chamber (11) through which a refrigerant to be sucked into the compression chamber (9) flows; a discharge chamber (10) through which a refrigerant having been discharged from the compression chamber (9) flows; and a tooth pressure chamber (12) which connects to the compression chamber (9) through a communication passage (13) and which has the same pressure as the compression chamber (9) during the operation of a screw compressor (1). After the stop of operation of the screw compressor (1), a refrigerant gas having a pressure higher than pressure in the compression chamber (9) is introduced from the tooth pressure chamber (12) into the compression chamber (9).

Description

technical field [0001] The present invention relates to a screw compressor, and more particularly to a structure for preventing wear and deformation of a star wheel when the screw compressor is stopped. Background technique [0002] Conventionally, single-screw compressors used as compressors for refrigeration, air conditioning, and the like are known. For example, the single-screw compressors of Patent Documents 1 and 2 include a screw rotor having a plurality of helical grooves (gutters) on the outer peripheral surface, and two disk-shaped star wheels having a plurality of gates (teeth). The axis centers of the two star wheels are perpendicular to the axis centers of the screw rotors, and are arranged symmetrically across the screw rotors. In addition, two compression chambers are formed in the cylindrical wall by the inner peripheral surface of the cylindrical wall, the tooth grooves of the screw rotor, and the teeth of the star wheel. [0003] In this single-screw comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/52F04C29/04
CPCF04C18/52F04C28/06F04C29/0007F04C29/0021F04C29/04
Inventor 伊藤健冢本和幸上川雅章神田雅浩
Owner MITSUBISHI ELECTRIC CORP