EP4737729A1

EP4737729A1 - Claw compressor and method for assembling same

Info

Publication number: EP4737729A1
Application number: EP24851292.3A
Authority: EP
Inventors: Takuma YAMASHITA; Shinya Hamamoto; Yoshiyuki Okada; Keita KITAGUCHI; Akihiro KANAI; Hirohumi Hirata
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2023-08-04
Filing date: 2024-01-25
Publication date: 2026-05-06
Also published as: WO2025032857A1; JP2025023725A

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).

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 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 including: 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.

Advantageous Effects of Invention

According to the present disclosure, it is possible to reduce the manufacturing cost of the claw compressor. In addition, the assemblability of the claw compressor can be improved.

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 shows a claw compressor according to a second embodiment of the present disclosure, and is a cross-sectional view corresponding to FIG. 2.

Description of Embodiments

Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings.

[First Embodiment]

Hereinafter, a first embodiment of the present disclosure will be described.
The claw compressor 1 according to the present embodiment is used for an application of compressing vapor. As shown in FIG. 1, the claw compressor 1 includes a housing 6 that forms an outer shell, a compression part 3 in which a compression chamber 20 is formed, and a gear part (connecting part) 5 in which a timing gear is accommodated.
The housing 6 includes a first housing 7, a second housing 9, and a third housing 11.
The compression part 3 is formed by the first housing 7 and the second housing 9, and the gear part 5 is formed by the second housing 9 and the third housing 11. The claw compressor 1 is erected on an installation surface by, for example, four leg parts 12.
The compression part 3 includes a suction port 13 that suctions vapor (fluid), and a discharge port 15 that discharges the vapor after compression. The vapor is, for example, water vapor. The vapor to be suctioned may be negative pressure or positive pressure.
As shown in FIG. 2, the compression part 3 is configured such that the first housing 7 closes a recess formed at a front end (one end) of the second housing 9 and a compression chamber 20 is formed inside. The first housing 7 is airtightly attached to the second housing 9 via an O-ring 22.
A pair of rotors, that is, a male rotor (first rotor) 24 and a female rotor (second rotor) 26, are provided in the compression chamber 20.
As shown in FIG. 3, the male rotor 24 has a pair of hook-shaped claw parts 24a. The claw parts 24a are symmetrically provided about a first rotational axis O1. The male rotor 24 rotates counterclockwise (in a direction of an arrow A1) in FIG. 3.
The female rotor 26 has a pair of hook-shaped claw parts 26a. The claw parts 26a are symmetrically provided about a second rotational axis O2. The female rotor 26 rotates clockwise (in a direction of an arrow A2) in FIG. 3.
The claw parts 24a of the male rotor 24 and the claw parts 26a of the female rotor 26 mesh with each other in a non-contact manner. A recessed part 26b that receives the claw part 24a of the male rotor 24 during the compression step is formed in the female rotor 26. The compressed vapor is discharged from the discharge port 15 having a substantially triangular shape in FIG. 3.
As shown in FIG. 3, the compression chamber 20 has a shape defined by an inner wall 9a of the second housing 9, and has a cross-sectional shape in which two circles, that is, a circle centered on the first rotational axis O1 and a circle centered on the second rotational axis O2, partially overlap each other. Tips of the claw parts 24a and 26a of the respective rotors 24 and 26 move along the inner wall 9a of the second housing 9 with a predetermined clearance.
As shown in FIG. 2, the male rotor 24 is fastened to the first rotating shaft 32 by a first bolt 31. Specifically, as shown in FIG. 2, the first bolt 31 is screwed to the first rotating shaft 32 in a state where an axis of the first bolt 31 is aligned with the first rotational axis O1. A fastening structure (first bolt fastening part) is configured in a state where a central part of the male rotor 24 is interposed between the tip surface of the first rotating shaft 32 and a head of the first bolt 31. The head of the first bolt 31 is accommodated in a cylindrical recess 24c formed at the center of the male rotor 24.
The female rotor 26 is fastened to the second rotating shaft 42 by a second bolt 41. Specifically, the second bolt 41 is screwed to the second rotating shaft 42 in a state where an axis of the second bolt 41 is aligned with the second rotational axis O2. The second rotating shaft 42 is provided in parallel to the first rotating shaft 32. That is, the first rotational axis O1 and the second rotational axis O2 are parallel to each other.
A fastening structure (second bolt fastening part) is configured in a state where a central part of the female rotor 26 is interposed between the tip surface of the second rotating shaft 42 and a head of the second bolt 41. The head of the second bolt 41 is accommodated in a cylindrical recess 26c formed at the center of the female rotor 26. Therefore, before the female rotor 26 is fixed by the second bolt 41, the relative rotation between the female rotor 26 and the second rotating shaft 42 is allowed.
The first rotating shaft 32 that supports the male rotor 24 has a tip located in the compression chamber 20, and a rear end connected to a drive part (not shown). As the drive part, for example, an electric motor is used. The first rotating shaft 32 rotates about the first rotational axis O1, and thus the male rotor 24 rotates in the compression chamber 20. The first rotating shaft 32 is rotatably supported at two locations of a tip-end-side bearing 37 and a rear-end-side bearing 38. The tip-end-side bearing 37 is provided in the second housing 9 and, for example, a double-row ball bearing is used. However, the tip-end-side bearing 37 is not limited to a double row or a ball bearing. The rear-end-side bearing 38 is located closer to a rear end side than the tip-end-side bearing 37 and is provided in the third housing 11. The rear-end-side bearing 38 is a single-row ball bearing, but is not limited to a single row or a ball bearing.
A first timing gear 39 is fixed to the first rotating shaft 32 between a tip-end-side bearing 37 and the rear-end-side bearing 38. The first timing gear 39 is, for example, a spur gear and rotates about the first rotational axis O1 together with the first rotating shaft 32. The first rotating shaft 32 is connected to the second rotating shaft 42 via the gear part 5.
The first timing gear 39 is provided in the gear part 5 and is accommodated in a gear chamber 21 formed between a rear end (other end) of the second housing 9 and a front end of the third housing 11. The second housing 9 and the third housing 11 are attached to each other in a liquid-tight manner via an O-ring 23 to seal the lubricating oil in the gear chamber 21.
The inside of the gear chamber 21 (that is, the inside of the third housing 11) is in an oil atmosphere and lubricates the gear part 5.
As described above, the first bolt fastening part to which the first bolt 31 is fastened is provided at the tip (shaft end on one side) of the first rotating shaft 32. In addition, the rear end (shaft end on the other side) of the first rotating shaft 32 protrudes from the housing 6. Specifically, a rear end of the second rotating shaft 42 protrudes from the third housing 11. That is, the rear end of the second rotating shaft 42 is provided outside the third housing 11. The rear end of the first rotating shaft 32 is connected to a drive part (an electric motor or the like).
The second rotating shaft 42 that supports the female rotor 26 has a tip located in the compression chamber 20, and the rear end protruding from the third housing 11. A space S in which a rear-end-side bearing 48 is accommodated is formed in the third housing 11. The rear-end-side bearing 48 is lubricated with grease.
The second rotating shaft 42 rotates about the second rotational axis O2, and thus the female rotor 26 rotates in the compression chamber 20. The second rotating shaft 42 is rotatably supported at two locations of the tip-end-side bearing 47 and the rear-end-side bearing (bearing) 48. The tip-end-side bearing 47 is provided in the second housing 9 and, for example, a double-row ball bearing is used. However, the tip-end-side bearing 47 is not limited to a double row or a ball bearing. The rear-end-side bearing 48 is located closer to a rear end side than the tip-end-side bearing 47 and is provided on an outer side of the third housing 11. Specifically, the rear-end-side bearing 48 is provided in the space S adjacent to the gear chamber 21. The rear-end-side bearing 48 is a single-row ball bearing, but is not limited to a single row or a ball bearing.
A second timing gear 49 is fixed to the second rotating shaft 42 between the tip-end-side bearing 47 and the rear-end-side bearing 48. The second timing gear 49 is, for example, a spur gear and rotates about the second rotational axis O2 together with the second rotating shaft 42.
The second timing gear 49 is provided in the gear part 5 and is accommodated in the gear chamber 21. The second timing gear 49 meshes with the first timing gear 39, and a driving force is transmitted from the first timing gear 39. Therefore, the first rotating shaft 32 is a driving shaft, and the second rotating shaft 42 is a driven shaft.
As described above, the second bolt fastening part to which the second bolt 41 is fastened is provided at the tip (shaft end on one side) of the second rotating shaft 42. In addition, the rear end (shaft end on the other side) of the second rotating shaft 42 protrudes from the housing 6. Specifically, a rear end of the second rotating shaft 42 protrudes from the third housing 11. That is, the rear end of the second rotating shaft 42 is provided outside the third housing 11. The rear end of the second rotating shaft 42 is located in a space formed between the third housing 11 and the drive part (an electric motor or the like). A double nut 50 is fitted to the rear end of the second rotating shaft 42. The double nut 50 includes two nuts 50a that are arranged in the axial direction and are fitted to the second rotating shaft.
As will be described later, the double nut 50 is used to fasten the female rotor 26 to the second bolt fastening part of the second rotating shaft 42. The double nut 50 may be removed after the female rotor 26 is fastened.
The claw compressor 1 having the above-described configuration operates as follows.
The first rotating shaft 32 is rotationally driven by the drive part (not shown), and the male rotor 24 rotates in the compression chamber 20. The second rotating shaft 42 is rotated by the second timing gear 49 to which a rotational driving force is transmitted from the first timing gear 39 that rotates together with the first rotating shaft 32, and the female rotor 26 rotates in the compression chamber 20.
The male rotor 24 and the female rotor 26 rotate in the compression chamber 20, and the vapor is suctioned from the suction port 13. The male rotor 24 rotates counterclockwise (in the direction of the arrow A1) in FIG. 3, takes in vapor into the compression pocket formed by the claw parts 24a, and moves downward along the outer periphery of the compression chamber 20. The female rotor 26 rotates clockwise (in the direction of the arrow A2) in FIG. 3, takes in vapor into the compression pocket formed by the claw parts 26a, and moves downward along the outer periphery of the compression chamber 20. The compression pocket formed by the male rotor 24 and the compression pocket formed by the female rotor 26 merge at a center of a lower portion of the compression chamber 20, and the claw part 24a of the male rotor 24 enters the recessed part 26b of the female rotor 26 in the combined compression pocket to compress the vapor. The compressed vapor is discharged from the discharge port 15 to the outside.
Attachment of the third housing 11 and fastening of the female rotor 26 to the second bolt fastening part of the second rotating shaft 42 during the assembly of the claw compressor 1 are performed as follows.
In a case of attaching the third housing 11, the second rotating shaft 42 is inserted into the third housing 11 in a state where the rear-end-side bearing 48 is attached. An inner diameter of the rear-end-side bearing 48 is set to be loose with respect to an outer diameter of the second rotating shaft 42.
In a case where the female rotor 26 is fastened to the second rotating shaft 42 by using the second bolt 41, first, the double nut 50 is fitted to the rear end of the second rotating shaft 42. Next, the second bolt 41 is rotated and screwed to the second bolt fastening part of the second rotating shaft 42, in a state where the double nut 50 is fixed by a fixing jig (see an arrow A4 of FIG. 2). In this manner, the second rotating shaft 42 is prevented from rotating together in a case where the second bolt 41 is screwed.
According to the present embodiment, the following operations and effects are obtained.
In the present embodiment, the rear end of the second rotating shaft 42 is provided outside the housing 6. As a result, it is possible to easily access the rear end of the second rotating shaft 42. Therefore, in a case where the female rotor 26 is fastened to the bolt fastening part of the second rotating shaft 42 by the second bolt 41, the rear end of the second rotating shaft 42 can be fixed by the double nut 50. Therefore, in a case where the female rotor 26 is fastened to the second rotating shaft 42, the torque is transmitted without passing through the gear part 5 as indicated by an arrow A3 of FIG. 2. Therefore, the load applied to the gear part 5 can be reduced. Thus, the gear part 5 can be less likely to be damaged.
In addition, since the member of the connecting part can be selected based on the normal operation (operation of compressing the fluid in the compression chamber 20), the member of the connecting part having low rigidity can be selected. Therefore, the cost can be reduced.
In addition, the space in which the rear end of the second rotating shaft 42 is located is the space formed between the drive part and the third housing 11. As described above, since the rear end of the second rotating shaft 42 is located in the space that is inevitably formed in a case of connecting the claw compressor 1 and the drive part, it is not necessary to newly form a space in order to provide the double nut 50. Therefore, the increase in size of the claw compressor 1 can be suppressed.
In addition, the grease is dissolved in the oil in the oil atmosphere, but in the present embodiment, the rear-end-side bearing 48 is provided outside the housing 6. As a result, the rear-end-side bearing 48 can be lubricated with the grease. As a result, for example, the structure can be simplified as compared with a case of forming an oil groove or the like for supplying the lubricating oil to the rear-end-side bearing 48. Therefore, it is possible to reduce the manufacturing cost of the claw compressor 1.
In addition, since the rear-end-side bearing 48 is provided outside the housing 6, in a case where the rear-end-side bearing 48 is inserted into the second rotating shaft 42, the rear-end-side bearing 48 can be inserted while the second rotating shaft 42 is being checked from the axial direction. Therefore, the assemblability of the claw compressor 1 can be improved.

[Second Embodiment]

Next, a second embodiment of the present disclosure will be described with reference to FIG. 4.
In the present embodiment, the rear-end-side bearing 48 is provided inside the housing 6 (specifically, the third housing 11), which is different from the first embodiment. The embodiment is similar to the first embodiment as to the other structures, and thus the same structures will be denoted by the same reference numerals with detailed description thereof omitted.
In the present embodiment, a rear end cover 44 is provided in the third housing 11 and closes the rear end of the second rotating shaft 42. A space is formed on an inner side of the rear end cover 44. The rear end of the second rotating shaft 42 is disposed in the space formed on the inner side of the rear end cover 44. The space S in which the rear-end-side bearing 48 is provided is a part of the gear chamber 21. That is, the rear-end-side bearing 48 is provided in the gear chamber 21. The rear-end-side bearing 48 is lubricated by oil that fills the gear chamber 21. The rear end cover 44 is fixed to the third housing 11 in a liquid-tight manner via an O-ring (not shown).
According to the present embodiment, the following operations and effects are obtained.
In the present embodiment, the rear-end-side bearing 48 is provided inside the housing 6. As a result, the portion between the rear-end-side bearing 48 and the second rotating shaft 42 can be lubricated with oil. Therefore, wear due to creep can be suppressed. Therefore, the damage to the rear-end-side bearing 48 can be suppressed.
The present disclosure is not limited to each of the embodiments described above, and can be appropriately modified within a scope which does not depart from the gist of the present disclosure.
For example, in each of the above-described embodiments, the male rotor 24 is the driving side and the female rotor 26 is the driven side, but the male rotor 24 may be the driven side and the female rotor 26 may be the driving side.
The claw compressor and the method for assembling the same described in the embodiments described above are understood as follows, for example.
A claw compressor according to a first aspect of the present disclosure includes a housing (6) that forms an outer shell, a first rotor (24) provided with a claw part (24a) protruding in a radial direction, a first rotating shaft (32) 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 (31), a second rotor (26) that rotates in a direction opposite to the first rotor and has a recessed part (26b) that receives the claw part during a compression step, a second rotating shaft (42) 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 (41), a compression chamber (20) 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 (5) 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.
In the above-described configuration, the shaft end on the other side of the other (that is, the rotating shaft (hereinafter, referred to as a "driven shaft") that is not connected to the drive part) of the first rotating shaft or the second rotating shaft is provided outside the housing. As a result, it is possible to easily access the shaft end on the other side of the driven shaft (that is, the shaft end to which the bolt fastening part is not provided). Therefore, in a case where the rotor is fastened to the bolt fastening part of the driven shaft by the bolt, the shaft end on the other side of the driven shaft can be fixed by a fixture (for example, a double nut or the like). Therefore, the load applied to the connecting part can be reduced in a case where the rotor is fastened to the driven shaft. Thus, the connecting part can be less likely to be damaged.
In addition, since the member of the connecting part can be selected based on the normal operation (operation of compressing the fluid in the compression chamber), the member of the connecting part having low rigidity can be selected. Therefore, the cost can be reduced.
In addition, a claw compressor according to a second aspect of the present disclosure includes, in the first aspect, a bearing (48) that rotatably supports the first rotating shaft and/or the second rotating shaft, in which an inside of the housing is in an oil atmosphere, and the bearing is provided inside the housing.
In the above-described configuration, the bearing is provided inside the housing. As a result, the portion between the first rotating axis and/or the second rotating shaft and the bearing can be lubricated with oil. Therefore, wear due to creep can be suppressed. Accordingly, the damage to the bearing can be suppressed.
In addition, a claw compressor according to a third aspect of the present disclosure includes, in the first aspect, a bearing (48) that rotatably supports the first rotating shaft and/or the second rotating shaft, in which the bearing is provided outside the housing, and the bearing is lubricated with grease.
The grease is dissolved in the oil in the oil atmosphere, but in the above-described configuration, since the bearing is provided outside the housing, the bearing can be lubricated with the grease. As a result, for example, the structure can be simplified as compared with a case of forming an oil groove or the like for supplying the lubricating oil to the bearing. Therefore, it is possible to reduce the manufacturing cost of the claw compressor.
In addition, since the bearing is provided outside the housing, in a case where the bearing is inserted into the first rotating shaft and/or the second rotating shaft, the bearing can be inserted while the first rotating shaft and/or the second rotating shaft is being checked from the axial direction. Therefore, the assemblability of the claw compressor can be improved.
In addition, a method for assembling a claw compressor according to the first aspect of the present disclosure is a method for manufacturing a claw compressor (1) including a housing (6) that forms an outer shell, a first rotor (24) provided with a claw part (24a) protruding in a radial direction, a first rotating shaft (32) 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 (31), a second rotor (26) that rotates in a direction opposite to the first rotor and has a recessed part (26b) that receives the claw part during a compression step, a second rotating shaft (42) 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 (41), a compression chamber (20) that accommodates the first rotor and the second rotor, a connecting part (5) 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 including: 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.

Reference Signs List

1: claw compressor
3: compression part
5: gear part (connecting part)
6: housing
7: first housing
9: second housing
9a: inner wall
11: third housing
12: leg part
13: suction port
15: discharge port
20: compression chamber
21: gear chamber
22: O-ring
23: O-ring
24: male rotor (first rotor)
24a: claw part
24c: recess
26: female rotor (second rotor)
26a: claw part
26b: recessed part
26c: recess
31: first bolt
32: first rotating shaft
37: tip-end-side bearing
38: rear-end-side bearing
39: first timing gear
41: second bolt
42: second rotating shaft
44: rear end cover
47: tip-end-side bearing
48: rear-end-side bearing
49: second timing gear
50: double nut
50a: nut
O1: first rotational axis
O2: second rotational axis
S: space

Claims

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.