EP3936721A1

EP3936721A1 - Compressor and tool

Info

Publication number: EP3936721A1
Application number: EP19928733.5A
Authority: EP
Inventors: Youhei Hotta; Yoshiyuki Kimata; Takashi Watanabe; Hajime Sato; Takahiro Hashiba; Kouichirou Mori; Riko AOKI
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2022-01-12
Anticipated expiration: 2039-05-10
Also published as: WO2020230207A1; EP3936721A4; EP3936721C0; JPWO2020230207A1; JP7372967B2; EP3936721B1

Abstract

A compressor (1) comprising a rotary shaft (3), bearings (4A, 4B), a motor (5), a compression unit (6, 10), and a housing (2) accommodating the rotary shaft (3), bearings (4A, 4B), motor (5), and compression unit (6, 10), wherein a first hanging bolt hole (25) and a second hanging bolt hole (26) for hanging the housing (2) are provided in an outer peripheral side surface (21a) of a main body portion (21) of the housing (2), the first hanging bolt hole (25) is provided in a thick portion (21b) of the main body portion (21), and the second hanging bolt hole (26) is provided at a position offset by 180° from the thick portion (21b) in the peripheral direction of the main body portion (21).

Description

Technical Field

The present invention relates to a compressor and a tool.

Background Art

In the related art, as a compressor that is used for refrigeration and air conditioning, for example, a compressor as described in PTL 1 is known. This type of compressor includes a housing, a rotary shaft that extends in a vertical direction in the housing and is rotated by an electric motor, and a compression portion that compresses a refrigerant with the rotation of the rotary shaft.
Many of such compressors are small and are generally not very heavy.

Citation List

Patent Literature

[PTL 1] Japanese Unexamined Patent Application Publication No. 2018-66314

Summary of Invention

Technical Problem

However, in recent years, there has been a great demand for a larger capacity compressor, and the size of the compressor has been increased with an increase in capacity. Therefore, in a process of assembling such a large compressor, it is necessary to change the posture of a housing in order to facilitate the assembly.
The present invention has been made in view of the problem described above and has an object to provide a compressor and a tool in which it is possible to easily change the posture of a housing.

Solution to Problem

The present invention adopts the following aspects in order to solve the above problem and achieve the above object.

(1) A compressor according to an aspect of the present invention includes a rotary shaft extending along an axis, a bearing that supports the rotary shaft such that the rotary shaft is rotatable around the axis, a motor rotating the rotary shaft, a compression portion compressing a refrigerant with rotation of the rotary shaft, and a housing accommodating the rotary shaft, the bearing, the motor, and the compression portion, in which a mounting portion for hanging the housing is provided on an outer peripheral side surface of the housing.
According to the compressor according to the above aspect, for example, a hanging tool can be mounted to the mounting portion provided in the housing and lifted by a crane facility. At this time, since the mounting portion is disposed on the outer peripheral side surface of the housing, it is possible to easily change the housing to a rotated or inverted posture with the direction orthogonal to the axis of the rotary shaft when assembling the compressor, that is, the central axis of the housing, as a rotation center. Therefore, it is possible to efficiently perform the assembly work at the time of assembling the compressor.
(2) In the compressor according to the above (1), the mounting portions may be provided at a first position and a second position shifted from the first position by 180° in a circumferential direction in the housing.
According to such a configuration, it is possible to clamp the housing by using the mounting portions provided at the first position and the second position shifted from each other by 180° in the circumferential direction. That is, since the housing can be supported at the positions on both sides with the central axis of the housing interposed therebetween, it is possible to more reliably and easily rotate or invert the housing with the clamping position as the center.
(3) In the compressor according to the above (1) or (2), a plurality of the mounting portions may be provided at intervals in an axis direction of the rotary shaft.
In this case, since it is possible to clamp the housing by using a plurality of mounting portions at the clamping positions in the circumferential direction in the housing, a clamping force can be increased, a sufficient clamping force can be secured, and the housing can be rotated or inverted in a stable posture.
(4) In the compressor according to any one of the above (1) to (3), the mounting portion may be provided at a thick portion that bulges outward in a radial direction on the outer peripheral side surface of the housing.
Since the mounting portion is provided in the thick portion of the housing, the strength of the portion of the housing, in which the mounting portion is provided, can be increased. Therefore, it is possible to more reliably rotate or invert the housing.
(5) A tool according to another aspect of the present invention is a tool that clamps the mounting portion of the housing in the compressor according to any one of the above (1) to (4) and rotatably supports the housing, the tool including: a clamping portion that is detachably provided to the mounting portion and clamps the mounting portion; and a handle portion that rotates the clamping portion around a rotational axis extending in a direction intersecting a central axis of the housing, in a state where the clamping portion clamps the mounting portion.

The housing can be clamped by mounting the clamping portion of the tool of the above aspect to the mounting portion provided on the outer peripheral side surface of the housing. Then, the housing clamped by the clamping portion can be easily rotated or inverted around the central axis of the housing by rotating the handle portion of the tool. Therefore, it is possible to efficiently perform the work of assembling the compressor. Advantageous Effects of Invention
According to the compressor and the tool according to the aspects of the present invention, it is possible to easily change the posture of the housing of the compressor. Brief Description of Drawings

Fig. 1 is a vertical sectional view showing a configuration of a two-stage compressor according to a first embodiment of the present invention.
Fig. 2 is a perspective view of the two-stage compressor shown in Fig. 1 and is a diagram in which a first hanging bolt hole is viewed diagonally from the front.
Fig. 3 is a perspective view of the two-stage compressor shown in Fig. 1 and is a diagram in which a second hanging bolt hole is viewed diagonally from the front.
Fig. 4A is a front view showing a state where a housing main body is clamped by a tool and is a diagram showing the housing main body in a posture in which a rotational axis direction is directed in a horizontal direction.
Fig. 4B is a front view showing a state where the housing main body is clamped by the tool and is a diagram showing the housing main body rotated to a posture in which the rotational axis direction is directed upward. Description of Embodiments

Hereinafter, a compressor and a tool according to an embodiment of the present invention will be described based on the drawings. Such an embodiment is for showing an aspect of the present invention, does not limit the present invention, and can be optionally changed within the scope of the technical idea of the present invention.
As shown in Fig. 1, a compressor 1 according to the present embodiment is a vertical semi-sealed compressor that is used in, for example, an air conditioner, a refrigeration device, or the like. However, the type of the compressor 1 is not limited to that in the present embodiment.
The compressor 1 includes a housing 2, a rotary shaft 3, an upper bearing 4A, a lower bearing 4B, an electric motor 5, a rotary compression portion 6, a scroll compression portion 10, and a suction pipe 7. The rotary shaft 3 extends along an axis (a rotational axis O (described later)). The upper bearing 4A and the lower bearing 4B support the rotary shaft 3 such that the rotary shaft 3 is rotatable around the rotational axis O. The electric motor 5 rotates the rotary shaft 3. The rotary compression portion 6 compresses a refrigerant with the rotation of the rotary shaft 3. The suction pipe 7 allows the refrigerant to be introduced into compression chambers 63A and 63B of the rotary compression portion 6.
The compressor 1 of the present embodiment is a two-stage compressor that includes both the rotary compression portion 6 and the scroll compression portion 10. However, the compressor 1 may be a single-stage compressor provided with only one of the rotary compression portion 6 and the scroll compression portion 10, and the compressor 1 is not limited to the type in the present embodiment.
Here, the central axis of the housing 2 and the rotary shaft 3 are disposed on a common axis extending in a vertical direction (an up-down direction), and the common axis will be hereinafter referred to as a rotational axis O. The rotary shaft 3 is disposed such that an extending direction thereof is the up-down direction, and is accommodated in the housing 2 so as to be rotatable around the rotational axis O.
The housing 2 is formed by using casting or the like and extends in the up-down direction to accommodate the rotary shaft 3, the bearings 4A and 4B, the electric motor 5, the rotary compression portion 6, and the scroll compression portion 10. The housing 2 has a main body portion 21 having a cylindrical shape, and an upper lid portion 22 and a lower lid portion 23 that close the upper and lower openings of the main body portion 21. The inside of the housing 2 is hermetically sealed by the upper lid portion 22 and the lower lid portion 23. The housing 2 has an opening portion 24 formed above a cylinder 60 (60A, 60B) at a lower portion of a side wall. The suction pipe 7 is fixed to the opening portion 24 in a state where the suction pipe 7 is inserted into the opening portion 24 with a pipe axis direction directed in the horizontal direction.
Oil is accumulated in a bottom portion of the housing 2, so that an oil reservoir is formed. The liquid level of the oil reservoir at the time of initial filling of oil is located above the rotary compression portion 6. In this way, the rotary compression portion 6 is driven in the oil reservoir.
The upper lid portion 22 is provided with a discharge pipe 13 that penetrates a peripheral wall portion in a thickness direction and communicates with the inside of the housing 2. The discharge pipe 13 discharges the compressed refrigerant to the outside of the housing 2.
As shown in Figs. 2 and 3, a plurality of hanging bolts 27 are detachably provided on an upper surface 22a of the upper lid portion 22. The housing 2 can be lifted by a crane or the like by using the hanging bolts 27.
A refrigerant flow path 28, through which the refrigerant compressed in the rotary compression portion 6 flows toward the scroll compression portion 10, is provided to extend in the up-down direction inside the main body portion 21. The refrigerant flow path 28 is a space formed between a stator 52 of the electric motor 5 (described later) and the inner peripheral surface of the main body portion 21. As shown in Fig. 2, a thick portion 21b is formed on an outer peripheral side surface 21a of the main body portion 21 corresponding to the position where the refrigerant flow path 28 is provided in the main body portion 21. The thick portion 21b is formed so as to bulge outward in the radial direction from the outer peripheral side surface 21a of the main body portion 21. The thick portion 21b has a rectangular parallelepiped shape extending with the direction of the rotational axis O as a longitudinal direction. Here, the outer peripheral side surface 21a of the main body portion 21 is a side surface of the main body portion 21 extending in the circumferential direction orbiting around the rotational axis O. A pair of first hanging bolt holes 25 and 25 (mounting portions) are provided at an interval in the up-down direction (the direction of the rotational axis O) on the outer surface of the thick portion 21b. Female screws to which mounting bolts 86 (refer to Fig. 4B) can be screwed are formed in the first hanging bolt holes 25 and 25. The thick portion 21b is recessed inward in the radial direction at the positions where the first hanging bolt holes 25 and 25 are formed, and is made such that a fixing portion 85 of a clamping portion 82 (described later) is just fitted thereto (refer to Figs. 4A and 4B).
Further, as shown in Fig. 3, a pair of protrusions 21c and 21c are formed at an interval in the up-down direction (the direction of the rotational axis O) at a second position shifted by 180° in the circumferential direction in the housing 2 from the first position where the thick portion 21b is provided, in the main body portion 21. The protrusion 21c protrudes outward in the radial direction from the outer peripheral side surface 21a. The protrusion 21c has a columnar shape in which the radial direction is a longitudinal direction thereof. A second hanging bolt hole 26 (a mounting portion) is provided in the protruding end face of each of the protrusions 21c. Female screws, to each of which the mounting bolt 86 (refer to Fig. 4B) can be screwed, are formed in the second hanging bolt holes 26 and 26.
Each of the first hanging bolt holes 25 and each of the second hanging bolt holes 26 are disposed at the same position in the direction of the rotational axis O so as to form a pair.
As shown in Fig. 1, the electric motor 5 is accommodated in a central portion in the up-down direction of the inside of the housing 2. The electric motor 5 includes a rotor 51 and the stator 52. The rotor 51 is fixed to the outer peripheral surface of the rotary shaft 3 and is disposed above the rotary compression portion 6. The stator 52 is disposed so as to surround the outer peripheral surface of the rotor 51 and is fixed to the inner surface of the main body portion 21 of the housing 2.
A power supply (not shown) is connected to the electric motor 5 through a terminal 9. The electric motor 5 rotates the rotary shaft 3 by the electric power from the power supply.
The upper bearing 4A and the lower bearing 4B are disposed so as to sandwich the rotary compression portion 6 from above and below. The upper bearing 4A and the lower bearing 4B are formed of, for example, a metal material, and are fixed to the cylinder 60 configuring the rotary compression portion 6 by, for example, bolting.
Further, the upper bearing 4A is fixed to the housing 2. The rotary shaft 3 is supported by the upper bearing 4A and the lower bearing 4B so as to be rotatable around the rotational axis O.
The rotary compression portion 6 is disposed at the bottom portion in the housing 2 below the electric motor 5 and compresses the refrigerant sucked from the suction pipe 7. The rotary compression portion 6 includes a pair of disk-shaped cylinders 60 (60A, 60B), an eccentric shaft portion 61 provided integrally with the rotary shaft 3 at a position eccentric with respect to the rotary shaft 3, and a piston rotor 62 rotating together with the eccentric shaft portion 61. The piston rotor 62 performs eccentric rotating motion in the compression chambers 63A and 63B of the cylinders 60A and 60B, so that the refrigerant is compressed.
A discharge hole (not shown) is provided in the cylinder 60 of the rotary compression portion 6. The refrigerant compressed in the rotary compression portion 6 is discharged from the discharge hole toward the internal space having intermediate pressure in the housing 2, that is, the refrigerant flow path 28.
The scroll compression portion 10 further compresses the refrigerant from the refrigerant flow path 28. The scroll compression portion 10 includes a spiral orbiting scroll 11 that orbits with the rotation of the rotary shaft 3, and a fixed scroll 12 that meshes with the orbiting scroll 11 from above in the direction of the rotational axis O and is fixed to the housing 2. The refrigerant compressed in the scroll compression portion 10 is discharged to the outside of the housing 2 through the discharge pipe 13.
Next, a tool 8 that is used when assembling the compressor 1 described above will be described using Figs. 4A and 4B.
The tool 8 is a tool for clamping the hanging bolt holes 25 and 26 of the housing 2 of the compressor 1 and rotatably supporting the housing 2.
The tool 8 includes a pair of support arms 81, the clamping portion 82 detachably provided to each of the hanging bolt holes 25 and 26 provided in the main body portion 21 of the housing 2, and a handle portion 83 for rotating the clamping portion 82. Arms 81A and 81B are separated from each other with a distance, in which they can clamp the main body portion 21 from the radial direction, between them. Further, the arms 81A and 81B are connected to each other at the upper ends thereof by a connection frame 80. A plurality of support portions 80a, to which a hook H and a wire W can be mounted so as to protrude upward on the side opposite to the arms 81A and 81B, are integrally provided at the connection frame 80.
The clamping portions 82 are provided so as to face each other at the pair of arms 81A and 81B. The clamping portion 82 has a rotating portion 84 and a fixing portion 85 fixed to the rotating portion 84. The fixing portion 85 is a long member, and the central portion thereof in the length direction is fixed to the rotating portion 84. A bolt hole 85a, which penetrates in a direction in which the pair of clamping portions 82 and 82 face each other and is provided at a position coinciding with each of the hanging bolt holes 25 and 26 of the housing 2, is formed in the fixing portion 85. The housing 2 can be clamped by the tool 8 by inserting the mounting bolt 86 into the bolt hole 85a and screwing and fastening the mounting bolt 86 to each of the hanging bolt holes 25 and 26.
The handle portion 83 has a power transmission portion 83a that is supported by the arm 81A on the outside of the arm 81A and rotates the rotating portion 84, and a handle main body 83b that gives a rotational force to the power transmission portion 83a. The handle main body 83b is rotated, whereby the housing 2 clamped by the clamping portions 82 is changed to a posture in which the housing 2 is rotated at a desired rotation angle.
Next, the operation and effects of the compressor and the tool described above will be specifically described based on the drawings.
In the compressor 1 according to the present embodiment, as shown in Figs. 2 and 3, for example, the tool 8 as described above is mounted to the first hanging bolt hole 25 and the second hanging bolt hole 26 provided in the main body portion 21 of the housing 2, and then the tool 8 can be lifted by, for example, a crane facility through the wire W and the hook H. At this time, since the hanging bolt holes 25 and 26 are disposed on the outer peripheral side surface 21a of the main body portion 21, as shown in Figs. 4A and 4B, the main body portion 21 can be easily changed to a rotated or inverted posture with the axis extending in the direction orthogonal to the rotational axis O, that is, in the radial direction of the housing 2 as a rotation center C. Therefore, even if the compressor 1 is large, it is possible to efficiently perform the work of assembling the compressor 1.
Further, in the present embodiment, the housing 2 (the main body portion 21) can be clamped by using the first hanging bolt holes 25 and the second hanging bolt holes 26 provided in the thick portion 21b and the protrusion 21c shifted from each other by 180° in the circumferential direction in the main body portion 21 of the housing 2 (refer to Figs. 4A and 4B). That is, since the main body portion 21 can be supported at positions on both sides with the central axis of the main body portion 21 interposed therebetween, the main body portion 21 can be more reliably and easily rotated or inverted with the clamping position as the center.
Further, in the present embodiment, since it is possible to clamp the main body portion 21 by using the two mounting portions (the first hanging bolt holes 25 or the second hanging bolt holes 26) disposed at an interval in the direction of the rotational axis O at the clamping positions in the circumferential direction in the main body portion 21, a clamping force can be increased, a sufficient clamping force can be secured, and the main body portion 21 can be rotated or inverted in a stable posture.
Further, in the present embodiment, since the first hanging bolt hole 25 is provided in the thick portion 21b of the main body portion 21, it is possible to increase the strength of the portion of the housing 2, where the mounting portion (the first hanging bolt hole 25 as in the present embodiment) is provided. Therefore, it is possible to more reliably rotate or invert the housing 2.
Further, in the tool 8 according to the present embodiment, as shown in Figs. 4A and 4B, the main body portion 21 can be clamped by mounting the clamping portions 82 of the tool 8 to the first hanging bolt hole 25 and the second hanging bolt hole 26 provided on the outer peripheral side surface 21a of the main body portion 21 of the housing 2. Then, by rotating the handle portion 83 of the tool 8, it is possible to easily rotate or invert the clamped main body portion 21 around the rotation center C. Therefore, even if the compressor 1 is large, it is possible to efficiently perform the assembly work.
The embodiment related to the compressor 1 and the tool 8 according to the present invention has been described above. However, the present invention is not limited to the embodiment described above and can be appropriately changed within a scope which does not depart from the gist of the present invention.
For example, in the present embodiment, the configuration is adopted in which the mounting portions (the first hanging bolt hole 25 and the second hanging bolt hole 26) are provided in the thick portion 21b and the protrusion 21c shifted from each other by 180° in the circumferential direction in the main body portion 21. However, there is no limitation to these positions. For example, there is no limitation to two locations (the first position and the second position) shifted from each other by 180° in the circumferential direction, and only one position in the circumferential direction may be used. In a case where the mounting portion is provided at only one location in the circumferential direction, a support state by cantilever is created. However, if a reliable supporting force (clamping force) is obtained, the housing 2 can be clamped at only one location and then rotated or inverted.
Further, the mounting portion is not provided in the thick portion 21b or the protrusion 21c and may be directly provided on the outer peripheral side surface 21a of the main body portion 21, for example.
Further, in the present embodiment, the configuration is adopted in which the first hanging bolt holes 25 and the second hanging bolt holes 26 are respectively provided at the two locations at an interval in the direction of the rotational axis O. However, the location may be one or three or more.
Further, in the present embodiment, the configuration is adopted in which the mounting portions (the first hanging bolt hole 25 and the second hanging bolt hole 26) are provided in the main body portion 21 of the housing 2. However, as long as it is the outer peripheral side surface of the housing 2, it is not limited to the outer peripheral side surface 21a of the main body portion 21.
Furthermore, in the embodiment described above, as the tool which is mounted to the mounting portion, the configuration in which the tool is provided with the support arm 81 or the rotatable handle portion 83 shown in Figs. 4A and 4B is shown as an example. However, the tool to be mounted to the mounting portion is not limited to the tool described above. For example, a form may be adopted in which an eyebolt is mounted to the mounting portion and the eyebolt is hung with a wire and lifted by a crane.
Further, the configuration such as the shape or the size of each of the housing 2, the rotary shaft 3, the upper bearing 4A, the lower bearing 4B, the electric motor 5, the rotary compression portion 6 (the cylinder 60, the eccentric shaft portion 61, the piston rotor 62), the scroll compression portion 10 (the orbiting scroll 11, the fixed scroll 12), and the suction pipe 7 can be set to an appropriate configuration. For example, in the present embodiment, the twin rotary type compressor having the pair of cylinders 60A and 60B has been described. However, a single rotary type compressor may be adopted.
In addition, it is possible to appropriately replace the components in the embodiment described above with well-known components within the scope which does not depart from the gist of the present invention, and the embodiments described above may be combined appropriately.

Industrial Applicability

According to the compressor and the tool of the present invention, it is possible to easily change the posture of the housing.

Reference Signs List

1:: compressor
2:: housing
3:: rotary shaft
4A:: upper bearing
4B:: lower bearing
5:: electric motor
6:: rotary compression portion (compression portion)
8:: tool
10:: scroll compression portion (compression portion)
11:: orbiting scroll
12:: fixed scroll
21:: main body portion
21a:: outer peripheral side surface
21b:: thick portion (first position)
21c:: protrusion (second position)
25:: first hanging bolt hole (mounting portion)
26:: second hanging bolt hole (mounting portion)
28:: refrigerant flow path
60 (60A, 60B):: cylinder
63A, 63B:: compression chamber
80:: connection frame
80a:: support portion
81 (81A, 81B):: support arm
82:: clamping portion
83:: handle portion
83a:: power transmission portion
83b:: handle main body
84:: rotating portion
85:: fixing portion
86:: mounting bolt
W:: wire
H:: hook
O:: rotational axis (axis)
C:: rotation center

Claims

A compressor comprising:
a rotary shaft extending along an axis;

a bearing that supports the rotary shaft such that the rotary shaft is rotatable around the axis;

a motor rotating the rotary shaft;

a compression portion compressing a refrigerant with rotation of the rotary shaft; and

a housing accommodating the rotary shaft, the bearing, the motor, and the compression portion,

wherein a mounting portion for hanging the housing is provided on an outer peripheral side surface of the housing.
The compressor according to claim 1, wherein the mounting portions are provided at a first position and a second position shifted from the first position by 180° in a circumferential direction in the housing.
The compressor according to claim 1 or 2, wherein a plurality of the mounting portions are provided at intervals in an axis direction of the rotary shaft.
The compressor according to any one of claims 1 to 3, wherein the mounting portion is provided at a thick portion that bulges outward in a radial direction on the outer peripheral side surface of the housing.
A tool that clamps the mounting portion of the housing in the compressor according to any one of claims 1 to 4 and rotatably supports the housing, comprising:
a clamping portion that is detachably provided to the mounting portion and clamps the mounting portion; and

a handle portion that rotates the clamping portion around a rotational axis extending in a direction intersecting a central axis of the housing, in a state where the clamping portion clamps the mounting portion.