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Screw compressor

A screw compressor and screw technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve problems such as mechanical loss, achieve the effect of improving efficiency and reducing mechanical loss

Inactive Publication Date: 2013-04-10
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the configuration in which oil or refrigerant (hereinafter also referred to as oil, etc.) is injected into the compression chamber, the injected oil, etc. may become resistance when the screw rotor rotates, causing mechanical loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] A screw compressor (1) according to Embodiment 1 of the present invention is provided in a refrigerant circuit performing a refrigeration cycle to compress refrigerant. like figure 2 , 3 As shown, the screw compressor (1) is constructed as a semi-hermetic type. In this screw compressor (1), a compression mechanism (20) and a motor (not shown) for driving it are housed in one casing (10). The compression mechanism (20) is connected to the motor via a drive shaft (21). In addition, in the housing (10), a low-pressure space (S1) is formed, which introduces low-pressure gas refrigerant from the evaporator of the refrigerant circuit and simultaneously guides the low-pressure gas to the compression mechanism (20), and a low-pressure space (S1) from the compression mechanism ( 20) The high-pressure space (S2) into which the discharged high-pressure gas refrigerant flows.

[0051] The compression mechanism (20) has: a screw rotor (40), a cylindrical wall (11) that constitu...

Embodiment approach 2

[0093] Next, a screw compressor (201) according to Embodiment 2 of the present invention will be described.

[0094] The position of the oil supply mechanism (203) of the screw compressor (201) of Embodiment 2 is different from that of the oil supply mechanism (3) of Embodiment 1. Therefore, the same reference numerals are assigned to the same configurations as those in Embodiment 1, and description thereof will be omitted, and the description will focus on different configurations.

[0095] like Image 6 As shown, in the oil supply mechanism (203) of Embodiment 2, the nozzle is formed near the gate rotor (50A (50B)). That is, the oil supply mechanism (203) is configured to inject oil toward the engagement portion between the gate (51) and the spiral groove (41).

[0096] Specifically, the first passage (231) is formed as follows. That is, the outer peripheral surface of the screw rotor (40) whose axis is at the meshing position with the helical grooves (41) and the gate (51)...

Embodiment approach 3

[0103] Next, a screw compressor (301) according to Embodiment 3 of the present invention will be described.

[0104] In the screw compressor (301) of Embodiment 3, the position of the oil supply mechanism (303) is different from that of the oil supply mechanism (3) of Embodiment 1. Therefore, the same reference numerals are assigned to the same configurations as those in Embodiment 1, and description thereof will be omitted, and the description will focus on different configurations.

[0105] like Figure 7 As shown, the oil supply mechanism (303) of Embodiment 3 configures the screw compressor (301) so that the oil injected from the injection port (331a) is directed toward the start end side in the extending direction of the spiral groove (41).

[0106] The nozzle (331a) of the first passage (331) is the same as Embodiment 1, and is formed in the circumferential direction of the cylinder wall (11), at the middle position of the two gate rotors (50A, 50B); ) axis direction, ...

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Abstract

In order to prevent mechanical loss from increasing at a time of injecting oil or refrigerant into a compression chamber, a screw compressor (1) is provided with a screw rotor (40) and gate rotors (50A, 50B), in which, in compression chambers (23, 23, ...) formed with helical grooves (41, 41, ...) and gates (51, 51, ...), refrigerant taken-in from a starting-end side of the helical grooves (41, 41, ...) is compressed and discharged from a dead-end side of the helical grooves (41, 41, ...). The screw compressor (1) is further provided with injection mechanisms (3, 3) for injecting oil from discharge hole (31a, 31a) thereof into the compression chambers (23, 23, ...). The injection mechanisms (3, 3) inject oil to the screw rotor (40) such that rotational torque is imparted in a direction in which the screw rotor (40) is rotated at a time of compression.

Description

technical field [0001] The present invention relates to a screw compressor that injects oil or refrigerant into a compression chamber. Background technique [0002] Conventionally, as a compressor for compressing refrigerant and air, there is known a single-screw compressor including a single screw rotor, a housing for accommodating the screw rotor, and two gate rotors (see Patent Document 1). [0003] In the screw compressor, a gate of a gate rotor is engaged in a spiral groove of a screw rotor to form a compression chamber, and the refrigerant in the compression chamber is compressed by the rotation of the screw rotor and the gate rotor. Here, oil is sprayed into the compression chamber in order to lubricate the spiral groove and the gate and to improve the sealing performance between the spiral groove and the gate. [0004] In addition to oil, there is also known a screw compressor that injects a liquid refrigerant into a compression chamber, or injects an intermediate-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/52F04C18/16F04C29/04
CPCF04C18/16F04C29/042F04C18/52
Inventor 后藤望后藤英之宫村治则藤原秀规
Owner DAIKIN IND LTD