EP-4737727-A1 - CLAW COMPRESSOR

EP4737727A1EP 4737727 A1EP4737727 A1EP 4737727A1EP-4737727-A1

Abstract

Provided is a claw compressor comprising a male rotor (24), a female rotor, a compression part (3), and a seal part. The compression part (3) forms a compression chamber (20) between an accommodation surface (9b) and an accommodation surface (7a). The seal part increases the air-tightness of at least one of: a first clearance (CL1) between the accommodation surface (9b) and an end surface (24d), of the male rotor, facing the accommodation surface (9b); a second clearance between the accommodation surface (9b) and an end surface, of the female rotor, facing the accommodation surface (9b); a third clearance (CL3) between the accommodation surface (7a) and an end surface (24e), of the male rotor (24), facing the accommodation surface (7a); and a fourth clearance between the accommodation surface (7a) and an end surface, of the female rotor, facing the accommodation surface (7a).

Inventors

YAMASHITA, Takuma
HAMAMOTO, SHINYA
OKADA, YOSHIYUKI
KITAGUCHI, Keita
KANAI, Akihiro
HIRATA, HIROHUMI

Assignees

Mitsubishi Heavy Industries, Ltd.

Dates

Publication Date: 20260506
Application Date: 20240125

Claims (10)

A claw compressor comprising: a first rotor that has a plurality of first claw parts protruding in a radial direction; a first rotating shaft that rotatably supports the first rotor; a second rotor that rotates in a direction opposite to the first rotor and has a plurality of second claw parts protruding in the radial direction; a second rotating shaft that rotatably supports the second rotor; a compression part that forms a compression chamber accommodating the first rotor and the second rotor; and a seal part that increases air-tightness of clearances between the first rotor and the compression part and between the second rotor and the compression part, wherein the first rotor has a plurality of first recessed parts that receive the plurality of second claw parts, the second rotor has a plurality of second recessed parts that receive the plurality of first claw parts, the compression part forms the compression chamber between a first accommodation surface and a second accommodation surface that are orthogonal to the first rotating shaft and the second rotating shaft, and the seal part increases air-tightness of at least one of a first clearance between the first accommodation surface and an end surface of the first rotor that faces the first accommodation surface, a second clearance between the first accommodation surface and an end surface of the second rotor that faces the first accommodation surface, a third clearance between the second accommodation surface and an end surface of the first rotor that faces the second accommodation surface, and a fourth clearance between the second accommodation surface and an end surface of the second rotor that faces the second accommodation surface.
The claw compressor according to Claim 1, wherein the seal part has a first tip seal disposed in a first groove part formed in the end surface of the first rotor that faces the first accommodation surface, a second tip seal disposed in a second groove part formed in the end surface of the second rotor that faces the first accommodation surface, and a third tip seal disposed in a third groove part formed in the end surface of the first rotor that faces the second accommodation surface, and a discharge port that discharges vapor compressed between the first claw parts and the second recessed parts or between the second claw parts and the first recessed parts is formed in a region of the second accommodation surface that faces the end surface of the second rotor.
The claw compressor according to Claim 2, further comprising: a fluid supply port that supplies a fluid for reducing a temperature of the vapor to at least one of the first groove part, the second groove part, and the third groove part.
The claw compressor according to Claim 2, further comprising: a fluid supply port that supplies a fluid for reducing a temperature of the vapor compressed between the first claw parts and the second recessed parts or between the second claw parts and the first recessed parts to the compression chamber, wherein the fluid supply port supplies the fluid from the second accommodation surface to the fourth clearance.
The claw compressor according to Claim 1, further comprising: a fluid supply port that supplies a fluid for reducing a temperature of vapor compressed between the first claw parts and the second recessed parts or between the second claw parts and the first recessed parts to the compression chamber, wherein the seal part has a first tip seal disposed in a first groove part formed in the end surface of the first rotor that faces the first accommodation surface, and a second tip seal disposed in a second groove part formed in the end surface of the second rotor that faces the first accommodation surface, and the fluid supply port supplies the fluid from the second accommodation surface to the third clearance and the fourth clearance.
The claw compressor according to Claim 1, further comprising: a fluid supply port that supplies a fluid for reducing a temperature of vapor compressed between the first claw parts and the second recessed parts or between the second claw parts and the first recessed parts to the compression chamber, wherein the compression part has a connecting surface that connects the first accommodation surface and the second accommodation surface and that is disposed to surround the compression chamber, and the fluid supply port supplies the fluid from the connecting surface to the compression chamber along a radial direction orthogonal to the first rotating shaft and the second rotating shaft.
The claw compressor according to Claim 1, further comprising: a fluid supply port that supplies a fluid for reducing a temperature of vapor compressed between the first claw parts and the second recessed parts or between the second claw parts and the first recessed parts to the compression chamber through an internal flow path formed inside the second rotor.
The claw compressor according to Claim 7, wherein the compression part has a connecting surface that connects the first accommodation surface and the second accommodation surface and that is disposed to surround the compression chamber, and the fluid supply port supplies the fluid to a clearance between the second rotor and the connecting surface.
The claw compressor according to Claim 1, wherein a first groove part is formed in the end surface of the first rotor that faces the first accommodation surface, a second groove part is formed in the end surface of the second rotor that faces the first accommodation surface, a third groove part is formed in the end surface of the first rotor that faces the second accommodation surface, a fourth groove part is formed in the end surface of the second rotor that faces the second accommodation surface, and the seal part has a fluid supply port that supplies a fluid for reducing a temperature of vapor to the first groove part, the second groove part, the third groove part, and the fourth groove part.
The claw compressor according to any one of Claims 3 to 9, further comprising: a regulating valve that regulates a supply amount of the fluid supplied from the fluid supply port to the compression chamber in accordance with a temperature of a fluid discharged from the compression chamber.

Description

Technical Field The present disclosure relates to a claw compressor. Background Art The claw compressor includes a pair of rotors having hook-shaped claw parts inside a housing that forms a compression chamber. Each rotor rotates at the same speed in opposite directions without contact while maintaining a predetermined clearance, and the two rotors form a compression pocket and discharge a fluid compressed in the compression pocket. Such a claw-type compressor is mainly used as a vacuum pump or a blower (for example, see PTL 1). Citation List Patent Literature [PTL 1] Japanese Patent No. 6845596 Summary of Invention Technical Problem In a case where a vapor-generating heat pump is used as an alternative to a boiler and generated vapor is compressed, a differential pressure between a suction pressure and a discharge pressure is large and leakage is large as compared with the vacuum pump or the blower. Therefore, in order to increase efficiency, it is necessary to reduce a clearance during a compression step. Meanwhile, in the claw-type compressor used as the vacuum pump or the blower, since the differential pressure between the suction pressure and the discharge pressure is small, there is no problem of reducing the clearance during the compression step, and sufficient countermeasures have not been taken. The present disclosure is made in view of the above-described circumstances, and an object of the present disclosure is to provide a claw compressor which can achieve high compression efficiency even in a vapor compression application. Solution to Problem A claw compressor according to an aspect of the present disclosure includes a first rotor that has a plurality of first claw parts protruding in a radial direction, a first rotating shaft that rotatably supports the first rotor, a second rotor that rotates in a direction opposite to the first rotor and has a plurality of second claw parts protruding in the radial direction, a second rotating shaft that rotatably supports the second rotor, a compression part that forms a compression chamber accommodating the first rotor and the second rotor, and a seal part that increases air-tightness of clearances between the first rotor and the compression part and between the second rotor and the compression part, in which the first rotor has a plurality of first recessed parts that receive the plurality of second claw parts, the second rotor has a plurality of second recessed parts that receive the plurality of first claw parts, the compression part forms the compression chamber between a first accommodation surface and a second accommodation surface that are orthogonal to the first rotating shaft and the second rotating shaft, and the seal part increases air-tightness of at least one of a first clearance between the first accommodation surface and an end surface of the first rotor that faces the first accommodation surface, a second clearance between the first accommodation surface and an end surface of the second rotor that faces the first accommodation surface, a third clearance between the second accommodation surface and an end surface of the first rotor that faces the second accommodation surface, and a fourth clearance between the second accommodation surface and an end surface of the second rotor that faces the second accommodation surface. Advantageous Effects of Invention According to the present disclosure, it is possible to provide the claw compressor that can achieve high compression efficiency even in the vapor compression application. Brief Description of Drawings FIG. 1 is a perspective view showing a claw compressor according to a first embodiment of the present disclosure.FIG. 2 is a cross-sectional view taken along cutting line II-II of the claw compressor of FIG. 1.FIG. 3 is a cross-sectional view taken along cutting line III-III of FIG. 2.FIG. 4 is a partially enlarged view showing a vicinity of a male rotor of the claw compressor shown in FIG. 2.FIG. 5 is a partially enlarged view showing a vicinity of a female rotor of the claw compressor shown in FIG. 2.FIG. 6 is a view of the male rotor and the female rotor which are shown in FIG. 2 as viewed from a side of a gear part.FIG. 7 is a view of the male rotor and the female rotor which are shown in FIG. 2 as viewed from a side of a discharge port.FIG. 8 is a view showing a first modification example of an injection port of the first embodiment of the present disclosure.FIG. 9 is a view showing a second modification example of the injection port of the first embodiment of the present disclosure.FIG. 10 is a view showing a third modification example of the injection port of the first embodiment of the present disclosure.FIG. 11 is a view showing a fourth modification example of the injection port of the first embodiment of the present disclosure.FIG. 12 is a cross-sectional view showing a vicinity of a male rotor of a claw compressor according to a second embodiment of the present disclosure.FIG. 13 is