Oil-free screw compressor

A screw compressor, screw technology, applied in the direction of rotary piston machinery, mechanical equipment, machine/engine, etc., can solve the problem of difficult to completely prevent the infiltration of lubricating oil, and achieve the effect of preventing oil accumulation

Active Publication Date: 2019-06-04
神钢压缩机株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, even if a costly sealing structure is provided, it is difficult to completely prevent the infiltration of lubricating oil into the motor chamber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach ）

[0027] like figure 1 As shown, the oil-free screw compressor 1 is provided with the compression part 10 in which the screw rotor 11 is arranged, the motor part 20 in which the motor 21 is arranged, and the connection part 30 which connects these. The oil-free screw compressor 1 is driven by the motor 21 of the motor section 20 to drive the screw rotor 11 of the compression section 10 to suck, compress, and discharge gas.

[0028] The compression unit 10 includes a male and female screw rotor 11 having a rotor shaft 12, a first bearing 13 and a second bearing 14 that support both ends of the rotor shaft 12, and a rotor casing 15 that accommodates these and defines the rotor chamber 10a. .

[0029] The screw rotor 11 has a female rotor and a male rotor, which mesh with each other in the rotor chamber 10a in a state of no oil supply, thereby compressing the gas. exist figure 1 The male rotor and its rotor shaft 12 are shown, but there are rotor shafts 12 on the male and female...

no. 2 Embodiment approach ）

[0056] image 3 The oil-free screw compressor 1 of the second embodiment is shown. In this embodiment, the same reference numerals are assigned to the same components as those in the first embodiment, and description thereof will be omitted.

[0057] In this embodiment, the communication part 32c is a member which makes the lubricating oil lubricated by the 2nd bearing 14 flow from the connection chamber 30a to the motor chamber 20a. That is, the flow direction of the lubricating oil in the communicating portion 32c is different from that of the first embodiment. However, as in the first embodiment, the communication portion 32c is a simple through hole, and the flow direction of lubricating oil in the communication portion 32c is limited by the difference between the flow pressure generated by the oil pump 43 and the internal pressure of the oil tank 41 .

[0058] In addition, in this embodiment, instead of the second oil discharge port 32b of the first embodiment (refer to...

no. 3 Embodiment approach ）

[0061] Figure 4 An oil-free screw compressor 1 according to a third embodiment is shown. In this embodiment, the same reference numerals are assigned to the same components as those in the first embodiment, and description thereof will be omitted.

[0062] In this embodiment, unlike the first embodiment, the first oil discharge port 25b is not provided on the motor case 25 (refer to figure 1 ) and oil line 40f (refer to figure 1 ). That is, instead of directly sending the lubricating oil from the motor chamber 20a to the oil tank 41, all the lubricating oil in the motor chamber 20a flows into the connection chamber 30a through the communicating portion 32c. Therefore, in this embodiment, the oil guide groove 26a for guiding the lubricating oil lubricated by the 4th bearing 24 to the communication part 32c is formed especially. as in Figure 4 As shown in detail in the sectional view in , the oil guide groove 26a is a groove formed on the inner surface of the bottom of th...

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Abstract

An oil-free screw compressor (1) is provided with: a screw rotor (11); a motor (21); a rotor casing (15) that defines a rotor chamber (10a); a motor casing (25) that defines a motor chamber (20a); a connection chamber (30a) provided between the rotor chamber (10a) and the motor chamber (20a); a communication part (32c) that connects the motor chamber (20a) and the connection chamber (30a); a second oil discharge port (32b) that discharges oil from the connection chamber (30a); and an oil line that forcibly circulates a lubricant oil by causing an oil pump (43) to flow the lubricant oil so as to supply the lubricant oil from an oil tank (41) to a second bearing (14), a third bearing (23), and a fourth bearing (24), and to return the lubricant oil to the oil tank (41) via a first oil discharge port (25b) and the second oil discharge port (32b).

Description

technical field [0001] The present disclosure relates to oil-free screw compressors. Background technique [0002] As one of the types of compressors, there is an oil-free screw compressor. The oil-free screw compressor includes a pair of male and female screw rotors and a motor for rotationally driving the screw rotors. In order to transmit power from the motor to the helical rotor, the helical rotor and the motor are mechanically connected via a rotating shaft member. The rotating shaft member is rotatably supported by the bearing, and lubricating oil is supplied to the bearing for lubrication and cooling. [0003] When oil for lubricating the bearing penetrates into the motor (motor chamber), the oil accumulates in the motor chamber, and stirring resistance occurs due to the accumulated oil, resulting in a power loss of the motor. In order to prevent this, the oil-free screw compressor disclosed in Patent Document 1, for example, is provided with a sealing structure th...

Claims

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Application Information

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IPC IPC(8): F04C29/02F04C18/16
CPCF04C18/16F04C29/02
Inventor 壶井升中村元滨田克德
Owner 神钢压缩机株式会社
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