EP-4737728-A1 - CLAW COMPRESSOR

EP4737728A1EP 4737728 A1EP4737728 A1EP 4737728A1EP-4737728-A1

Abstract

The present invention is provided with: a male rotor (24); a first rotating shaft (32) that rotatably supports the male rotor (24); a female rotor (26) that rotates in a direction opposite to the male rotor (24); a second rotating shaft (42) that rotatably supports the female rotor (26); a tip-end-side bearing (37) that rotatably supports the first rotating shaft (32); a second housing (9) in which a bearing chamber (19) that accommodates the tip-end-side bearing (37) is formed therein; and a third housing (11) that accommodates a gear part (5) and in which a gear chamber (21) filled with lubricating oil is formed therein. Inside the second housing (9), a first lubricating oil supply flow path that guides the lubricating oil filling the gear chamber (21), to the bearing chamber (19), and is inclined is formed. The upstream end of the lubricating oil supply flow path is formed on an end surface (9b) of the second housing (9). The mating surface between the third housing (11) and the second housing (9) is positioned closer to the tip-end-side bearing (37) side than the center of the gear part (5).

Inventors

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

Assignees

Mitsubishi Heavy Industries, Ltd.

Dates

Publication Date: 20260506
Application Date: 20240126

Claims (6)

A claw compressor comprising: a first rotor provided with a claw part protruding in a radial direction; a first rotating shaft that extends in a predetermined direction and rotatably supports the first rotor; 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 extends in the predetermined direction and rotatably supports the second rotor; a bearing part that rotatably supports the first rotating shaft and/or the second rotating shaft; a bearing chamber housing in which a bearing chamber that accommodates the bearing part is formed; and a rotating body housing in which a rotating body chamber that accommodates a rotating body and that is filled with lubricating oil is formed, wherein a lubricating oil supply flow path that guides the lubricating oil filling the rotating body chamber to the bearing chamber and that is inclined downward with respect to a horizontal plane is formed inside the bearing chamber housing, an upstream end of the lubricating oil supply flow path is formed on an end surface of the bearing chamber housing on a side of the rotating body housing, and a mating surface between the rotating body housing and the bearing chamber housing is located closer to a side of the bearing part than a center of the rotating body in the predetermined direction.
A claw compressor comprising: a first rotor provided with a claw part protruding in a radial direction; a first rotating shaft that extends in a predetermined direction and rotatably supports the first rotor; 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 extends in the predetermined direction and rotatably supports the second rotor; a bearing part that rotatably supports the first rotating shaft and/or the second rotating shaft; a bearing chamber housing in which a bearing chamber that accommodates the bearing part is formed; and a rotating body housing in which a rotating body chamber that accommodates a rotating body and that is filled with lubricating oil is formed, wherein a lubricating oil supply flow path that guides the lubricating oil filling the rotating body chamber to the bearing chamber and that is inclined downward with respect to a horizontal plane is formed inside the bearing chamber housing, and an inclination angle of the lubricating oil supply flow path is 5 degrees or more.
The claw compressor according to Claim 1 or 2, further comprising: a compression chamber that accommodates the first rotor and the second rotor, wherein a lubricating oil discharge flow path connected to an oil reservoir at atmospheric pressure is provided between the compression chamber and the bearing chamber.
The claw compressor according to Claim 1 or 2, further comprising: a compression chamber that accommodates the first rotor and the second rotor, wherein the bearing chamber housing is provided with a reduced-thickness space between the compression chamber and the bearing chamber, and the reduced-thickness space is provided closer to a side of a discharge port than a center of the compression chamber in an up-down direction when viewed from the predetermined direction.
The claw compressor according to Claim 4, wherein a heat insulating material is provided in the reduced-thickness space.
The claw compressor according to Claim 4, wherein the first rotor and the second rotor form a compression space in which a fluid is compressed, and the reduced-thickness space is provided at a position that overlaps the compression space immediately before communicating with the discharge port when viewed from the predetermined direction.

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. 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, an operation at a high load is required as compared with the vacuum pump or the blower. In a case of performing a high-load operation, such as compressing the vapor, a power transmission part (for example, a gear or the like) that transmits power from a driving shaft to a driven shaft, and a bearing part that supports each shaft, require lubrication with lubricating oil. In a case where the claw compressor is used for a vapor compression application in this manner, the following problems occur as compared with a vacuum pump application or a blower application. In the claw compressor, in a case where oil supply to the bearing part is performed by oil splashing caused by the power transmission part, it is necessary to provide an oil supply path that guides splashed lubricating oil to the bearing part. Meanwhile, in general, power for causing the lubricating oil to flow to the bearing part is only gravity. In such a situation, there is a possibility that reliability of the bearing part is reduced because the lubricating oil cannot be suitably guided to the bearing part. The present disclosure has been made in consideration of such circumstances, and an object of the present disclosure is to provide a claw compressor that can improve reliability of a bearing part. Solution to Problem In order to solve the above-described problems, the claw compressor of the present disclosure adopts the following means. A claw compressor according to an aspect of the present disclosure includes a first rotor provided with a claw part protruding in a radial direction, a first rotating shaft that extends in a predetermined direction and rotatably supports the first rotor, 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 extends in the predetermined direction and rotatably supports the second rotor, a bearing part that rotatably supports the first rotating shaft and/or the second rotating shaft, a bearing chamber housing in which a bearing chamber that accommodates the bearing part is formed, and a rotating body housing in which a rotating body chamber that accommodates a rotating body and that is filled with lubricating oil is formed, in which a lubricating oil supply flow path that guides the lubricating oil filling the rotating body chamber to the bearing chamber and that is inclined downward with respect to a horizontal plane is formed inside the bearing chamber housing, an upstream end of the lubricating oil supply flow path is formed on an end surface of the bearing chamber housing on a side of the rotating body housing, and a mating surface between the rotating body housing and the bearing chamber housing is located closer to a side of the bearing part than a center of the rotating body in the predetermined direction. Advantageous Effects of Invention According to the present disclosure, it is possible to improve the reliability of the bearing part. 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 cross-sectional view taken along cutting line IV-IV of the claw compressor of FIG. 2.FIG. 5 is an enlarged view of a V portion of the claw compressor of FIG. 4.FIG. 6 is an enlarged view of a VI portion of the claw compressor of FIG. 4.FIG. 7 shows a claw compressor according to a second embodiment of the present disclosure, and is a cross-sectional view corresponding to FIG. 3.FIG. 8 shows the claw compressor according to the second embodiment of the present disclosure, and is a cross-sectional view corresponding to FIG. 4. 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. In the following description, a Z-axis direction indicates a