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Screw compressor

A screw compressor and screw technology, which is used in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of reduced reliability, increased reliability, and high refrigerant temperature of single-screw compressors, and achieves high reliability, restraint Contact and sintering, the effect of suppressing thermal expansion

Active Publication Date: 2016-03-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when these gaps are excessively reduced to suppress performance degradation of the single-screw compressor, for example, when the fluid is a refrigerant, operating conditions under a high pressure difference, or when the motor speed increases due to an inverter, etc., The temperature of the compressed gas refrigerant will become higher
As a result, the screw rotor 2 thermally expands, and the possibility of the screw rotor 2 coming into contact with at least one of the bearing support portion 4 and the casing 1 and being sintered becomes high, so there is a problem that the reliability of the single-screw compressor decreases.

Method used

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Examples

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Embodiment approach 1

[0028] figure 1 It is a schematic configuration diagram of the screw compressor according to Embodiment 1 of the present invention.

[0029] Hereinafter, the configuration of the screw compressor according to Embodiment 1 will be described.

[0030] The screw compressor involved in Embodiment 1 is a single screw compressor, such as figure 1 As shown, a cylindrical casing 1 , a screw rotor 2 housed in the casing 1 , a star wheel 3 , a motor 20 , and a bearing support 4 are provided.

[0031] The outer peripheral portion of the screw rotor 2 is formed with a plurality of helical screw grooves 5, and the screw rotor 2 is arranged on the discharge side of the casing 1 ( figure 1 to the left of the ).

[0032] The motor 20 is composed of a stator 9 internally connected and fixed to the casing 1 and a motor rotor 10 arranged inside the stator 9, and drives the screw rotor 2 connected via the screw shaft 7 to rotate. In the case of an inverter system, the motor 20 speed is con...

Embodiment approach 2

[0048] figure 2 It is a schematic configuration diagram of a screw compressor according to Embodiment 2 of the present invention.

[0049] Hereinafter, Embodiment 2 will be described, but the content overlapping with Embodiment 1 will be omitted, and the same parts as Embodiment 1 or corresponding parts will be given the same reference numerals.

[0050] In the single screw compressor according to Embodiment 2, grooves 13 are formed in the screw rotor 2 at portions receiving oil or liquid refrigerant sprayed from the second flow path 12 formed in the bearing support portion 4 .

[0051] Forming the grooves 13 reduces the heat capacity of the screw rotor 2 and increases the surface area of ​​the screw rotor 2 that receives oil or liquid refrigerant sprayed from the second flow path 12 formed in the bearing support portion 4 . Therefore, the thermal expansion of the screw rotor 2 can be suppressed further than in the first embodiment. In addition, the grooves 13 are formed to...

Embodiment approach 3

[0055] image 3 It is a schematic configuration diagram of a screw compressor according to Embodiment 3 of the present invention.

[0056] Hereinafter, Embodiment 3 will be described, but the content overlapping with Embodiment 1 will be omitted, and the same parts as Embodiment 1 or corresponding parts will be assigned the same reference numerals.

[0057] In the single-screw compressor according to Embodiment 3, a valve 14 capable of being opened and closed is provided on the inlet side (casing 1 side) of the second flow path 12 .

[0058] By providing the valve 14, the valve 14 is opened only when the temperature of the gas refrigerant compressed in the compression chamber rises (for example, when the temperature of the gas refrigerant compressed in the compression chamber rises compared with a specified temperature) to allow the oil or liquid to refrigerate. The agent flows to the second flow path 12 and is sprayed toward the screw rotor 2 . Then, the screw rotor 2 recei...

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Abstract

A screw compressor is provided with: a screw rotor (2) housed within a casing (1) and having helical screw grooves (5) formed therein; a gate rotor (3) meshing and engaging with the screw grooves (5) of the screw rotor (2) to form a compression chamber; a motor (20) for rotating and driving the screw rotor (2) connected to the motor (20) through a screw shaft (7); and a bearing support (4) for supporting the screw shaft (7) through a bearing (6) disposed on the discharge side of the screw rotor (2). Oil and / or a refrigerant liquid is discharged toward the screw rotor (2) from flow passages formed within the casing (1) and within the bearing support (4).

Description

technical field [0001] The present invention relates to screw compressors for use in the compression of refrigerants such as refrigerators. Background technique [0002] Generally, among screw compressors there are single-screw compressors with a screw rotor and two star wheels. [0003] Figure 5 It is a schematic structural diagram of a conventional single-screw compressor. [0004] Such as Figure 5 As shown, one screw rotor 2 and two star wheels 3 of a conventional single screw compressor are accommodated in a casing 1 . A plurality of helical screw grooves 5 are formed in the screw rotor 2 , and the screw grooves 5 form compression chambers by meshing and engaging with a pair of star wheels 3 arranged in the radial direction of the screw rotor 2 . [0005] A low-pressure space and a high-pressure space are formed in the casing 1 . In addition, the screw rotor 2 is fixed to the screw shaft 7, and one end side of the screw shaft 7 is arranged on the discharge side of t...

Claims

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Application Information

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IPC IPC(8): F04C29/04F04C18/52F04C29/00
CPCF04C18/52F04C23/008F04C29/04F04C2240/56
Inventor 神田雅浩上川雅章塚本和幸
Owner MITSUBISHI ELECTRIC CORP
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