EP-4737729-A1 - CLAW COMPRESSOR AND METHOD FOR ASSEMBLING SAME

EP4737729A1EP 4737729 A1EP4737729 A1EP 4737729A1EP-4737729-A1

Abstract

A claw compressor (1) comprises: a housing (6) that forms an outer shell; a male rotor (24) that is provided with a claw part protruding in the radial direction; a first rotating shaft (32) that rotatably supports the male rotor (24); a first bolt fastening part that fastens the male rotor (24) to a shaft end on one side of the first rotating shaft (32) by means of a first bolt (31); a female rotor (26) that rotates in the opposite direction to the male rotor (24) and has a recess for receiving the claw part during a compression step; a second rotating shaft (42) that rotatably supports the female rotor (26); a second bolt fastening part that fastens the female rotor (26) to a shaft end on one side of the second rotating shaft (42) by means of a second bolt (41); a gear part (5) that connects the first rotating shaft (32) and the second rotating shaft (42); and a drive part that connects to one of the first rotating shaft (32) and the second rotating shaft (42). A shaft end on the other side of the other of the first rotating shaft (32) and the second rotating shaft (42) is provided outside the housing (6).

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 (4)

A claw compressor comprising: a housing that forms an outer shell; a first rotor provided with a claw part protruding in a radial direction; a first rotating shaft that rotatably supports the first rotor; a first bolt fastening part that fastens the first rotor to a shaft end on one side of the first rotating shaft by means of a bolt; a second rotor that rotates in a direction opposite to the first rotor and has a recessed part that receives the claw part during a compression step; a second rotating shaft that rotatably supports the second rotor; a second bolt fastening part that fastens the second rotor to a shaft end on one side of the second rotating shaft by means of a bolt; a compression chamber that accommodates the first rotor and the second rotor; a connecting part that connects the first rotating shaft and the second rotating shaft; and a drive part that connects to one of the first rotating shaft or the second rotating shaft, wherein a shaft end on the other side of the other of the first rotating shaft or the second rotating shaft is provided outside the housing.
The claw compressor according to Claim 1, further comprising: a bearing that rotatably supports the first rotating shaft and/or the second rotating shaft, wherein an inside of the housing is in an oil atmosphere, and the bearing is provided inside the housing.
The claw compressor according to Claim 1, further comprising: a bearing that rotatably supports the first rotating shaft and/or the second rotating shaft, wherein the bearing is provided outside the housing, and the bearing is lubricated with grease.
A method for assembling a claw compressor, which is a method for manufacturing a claw compressor including a housing that forms an outer shell, a first rotor provided with a claw part protruding in a radial direction, a first rotating shaft that rotatably supports the first rotor, a first bolt fastening part that fastens the first rotor to a shaft end on one side of the first rotating shaft by means of a bolt, a second rotor that rotates in a direction opposite to the first rotor and has a recessed part that receives the claw part during a compression step, a second rotating shaft that rotatably supports the second rotor, a second bolt fastening part that fastens the second rotor to a shaft end on one side of the second rotating shaft by means of a bolt, a compression chamber that accommodates the first rotor and the second rotor, a connecting part that connects the first rotating shaft and the second rotating shaft, and a drive part that connects to one of the first rotating shaft or the second rotating shaft, in which a shaft end on the other side of the other rotating shaft of the first rotating shaft or the second rotating shaft is provided outside the housing, the method comprising: a step of fixing a rotor to a bolt fastening part of the other rotating shaft in a state where the shaft end on the other side is fixed.

Description

Technical Field The present disclosure relates to a claw compressor and a method for assembling the same. Background Art The claw compressor includes a pair of rotors having hook-shaped claw parts inside a housing that forms a compression chamber. The pair of rotors are connected to each other via a timing gear. 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 the generated vapor is compressed, it is necessary to increase a capacity of a compressor as compared with the vacuum pump or the blower. In order to increase a capacity of the claw compressor, a large rotor is fixed to a shaft. The rotor is fixed to the shaft by fastening a bolt that is inserted into the rotor to a tip part of the shaft. Therefore, in a case where the large rotor is fixed to the shaft, a fastening force of the bolt with respect to the shaft is increased. The shaft is connected to each of the pair of rotors provided in the claw compressor. Therefore, the claw compressor includes two shafts. In the following description, a shaft directly connected to a motor is referred to as a "driving shaft", and a shaft connected to the driving shaft via the timing gear is referred to as a "driven shaft". The driving shaft of the two shafts needs to be connected to the motor, and thus protrudes outside the housing. Therefore, in a case where the bolt is fastened to the shaft, it is considered to fix the other end part of the driving shaft. Meanwhile, in a case where the rotor is fastened to the driven shaft, when the other end part of the driving shaft is fixed, a fastening torque is transmitted to the driving shaft via the timing gear, and thus the timing gear may be damaged. In addition, the fastening torque is extremely large as compared with a torque in a case of compressing a gas. Therefore, in a case where a gear is selected based on the fastening torque, a gear having rigidity that is several times higher than gear rigidity required for a normal operation of compressing the gas needs to be selected, and thus a cost may increase as compared with a case where the gear is selected based on the normal operation. The present disclosure has been made in view of such circumstances, and an object thereof is to provide a claw compressor and a method for assembling the same with which it is possible to reduce a manufacturing cost. In addition, another object of the present disclosure is to provide the claw compressor and the method for assembling the same which can improve assemblability. Solution to Problem In order to solve the above-described problems, the claw compressor and the method for assembling the same of the present disclosure adopts the following means. A claw compressor according to an aspect of the present disclosure includes a housing that forms an outer shell, a first rotor provided with a claw part protruding in a radial direction, a first rotating shaft that rotatably supports the first rotor, a first bolt fastening part that fastens the first rotor to a shaft end on one side of the first rotating shaft by means of a bolt, a second rotor that rotates in a direction opposite to the first rotor and has a recessed part that receives the claw part during a compression step, a second rotating shaft that rotatably supports the second rotor, a second bolt fastening part that fastens the second rotor to a shaft end on one side of the second rotating shaft by means of a bolt, a compression chamber that accommodates the first rotor and the second rotor, a connecting part that connects the first rotating shaft and the second rotating shaft, and a drive part that connects to one of the first rotating shaft or the second rotating shaft, in which a shaft end on the other side of the other of the first rotating shaft or the second rotating shaft is provided outside the housing. A method for assembling a claw compressor according to an aspect of the present disclosure is a method for manufacturing a claw compressor including a housing that forms an outer shell, a first rotor provided with a claw part protruding in a radial direction, a first rotating shaft that rotatably supports the first rotor, a first bolt fastening part that fastens the first rotor to a shaft end on one side of the first rotating shaft by means of a bolt, a second rotor that rotates in a direction opposite to the first rotor and has a recessed part that receives the claw part during a compression step, a second rotating shaft that rotatably supports the second rotor, a second bolt fastening part that fastens the second