Motor-operated compressor

Patent metadata

Field	Value
Publication number	US-10502212-B2
Application number	US-201615363287-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Apr 6, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A motor-operated compressor includes a casing having an inner space in which a driving motor, an orbiting scroll and a fixed scroll are accommodated, and a controller provided outside the casing. The casing includes an intake hole formed at a side adjacent to the controller and an exhaust hole formed at a side adjacent to the fixed scroll on the basis of the driving motor. The casing includes a communication passage formed between the casing and a stator of the driving motor, such that a refrigerant introduced into the inner space through the intake hole is introduced into the suction chamber through the driving motor. A back pressure space supporting the orbiting scroll is sealed by oil. The stator has teeth on its inner circumferential surface and protrusions on its outer circumferential surface, each protrusion being located within a width range of each tooth.

First claim

What is claimed is:

1. A motor-operated compressor, comprising:
a driving motor including:
a stator;
a coil wound on the stator; and
a rotor rotatably disposed within the stator;

a rotation shaft coupled to the rotor;
an orbiting scroll coupled to the rotation shaft, the orbiting scroll being provided to perform an orbiting motion;
a fixed scroll engaged with the orbiting scroll to form compression chambers together with the orbiting scroll, the compression chambers each having a suction chamber, an intermediate pressure chamber and a discharge chamber;
a frame supporting the orbiting scroll, the orbiting scroll being located between the frame and the fixed scroll;
a controller provided to control the driving motor, the driving motor being located between the controller and the frame; and
a casing having an inner space in which the driving motor, the orbiting scroll and the fixed scroll are located, the casing including:
an intake hole located at a first portion of the casing adjacent to the controller;
an exhaust hole located at a second portion of the casing adjacent to the fixed scroll, the driving motor being located between the intake hole and the exhaust hole; and
a communication passage located between the casing and the stator,

whereby a refrigerant introduced into an inner space of the casing through the intake hole is introduced into the suction chamber after passing through the communication passage between the casing and the stator of the driving motor,
wherein the stator includes:
a plurality of teeth provided on an inner circumferential surface of the stator;
a plurality of slots located along a circumferential direction of the stator, each slot being located between a pair of adjacent teeth of the plurality of teeth;
a coil wound on each of the plurality of teeth;
a plurality of protrusions provided on an outer circumferential surface of the stator, each protrusion of the plurality of protrusions having a predetermined height to be contactable with an inner circumferential surface of the casing; and
a plurality of recesses located along the circumferential direction of the stator, each recess being located between a pair of adjacent protrusions of the plurality of protrusions,

wherein each protrusion of the plurality of protrusions is aligned with a corresponding tooth of the plurality of teeth in a radial direction of the stator,
wherein each protrusion of the plurality of protrusions is located within an arcuate angular range encompassed by the corresponding tooth of the plurality of teeth,
wherein the compressor further comprises an oil pocket provided on an inner circumferential surface of a shaft hole extending through the frame, and
wherein the compressor further comprises an oil supply hole provided in the frame to supply oil to the oil pocket, wherein a first end of the oil supply hole branches from at least one back pressure hole provided in each of the fixed scroll and the frame, through which refrigerant and oil discharged from the compression chambers are introduced into a back pressure space, and a second end of the oil supply hole is communicated to the oil pocket.

2. The compressor of claim 1 , wherein the casing comprises a housing coupled with the stator, and a cover coupled to an end of the housing closest to the intake hole, the cover provided to seal the inner space of the casing,
wherein the controller comprises a plurality of switching elements coupled to an outer side surface of the cover, and
wherein a plurality of grooves are provided in the outer side surface of the cover, the grooves having a predetermined depth and width extending along peripheries of the switching elements.

3. The compressor of claim 2 , wherein the grooves surround outer circumferences of the switching elements.

4. The compressor of claim 2 , wherein the cover is made of a material lighter than a material forming the housing.

5. The compressor of claim 2 , further comprising a heat sink provided on an inner side surface of the cover to promote heat exchange between the switching elements and a refrigerant introduced into the inner space of the casing through the intake port, the heat sink comprising a plurality of heat sink fins or a plurality of heat sink recesses.

6. The compressor of claim 2 , further comprising:
a terminal mounting hole provided in the cover for coupling a terminal to the cover, at least one end of the terminal being inserted into the terminal mounting hole; and
a fixing member for securing the terminal to the cover.

7. The compressor of claim 6 , wherein the terminal includes:
a flange located at a first end of the terminal, the flange having an outer diameter greater than an inner diameter of the terminal mounting hole; and
a male thread located at a second end of the terminal,
wherein the fixing member includes a female thread, and
wherein the male thread of the terminal is inserted through the terminal mounting hole and coupled to the female thread of the fixing member located at an outer side surface of the cover, so that the flange is constrained by the inner side surface of the cover at a periphery of the teitninal mounting hole.

8. The compressor of claim 7 , further comprising a sealing member located between the flange and the inner side surface of the cover.

9. The compressor of claim 1 , further comprising a stress reducing portion provided in a ring shape and provided on the inner circumferential surface of the casing, the stress reducing portion being spaced apart from the outer circumferential surface of the stator, and the stress reducing portion being provided along a portion of an axial extent of the stator within a range in an axial direction of the stator.

10. The compressor of claim 9 , wherein the stress reducing portion is provided at a position where an end portion of the stator in the axial direction is accommodated within the casing.

11. The compressor of claim 1 , wherein the rotation shaft is inserted into the shaft hole such that an outer circumferential surface of the rotation shaft faces the inner circumferential surface of the shaft hole,
wherein one side of the shaft hole faces a rear surface of the orbiting scroll so as to form the back pressure space at the rear surface of the orbiting scroll, and
wherein a gap between the inner circumferential surface of the shaft hole and the outer circumferential surface of the rotation shaft is sealed by oil introduced into the back pressure space.

12. The compressor of claim 11 ,
wherein an entire sectional area of the back pressure hole is greater than or equal to an entire sectional area of the gap between the inner circumferential surface of the shaft hole and the outer circumferential surface of the rotation shaft.

13. The compressor of claim 12 , further comprising a balance weight located within the back pressure space and coupled to the rotation shaft to be rotatable together with the rotation shaft,
wherein an opening of the at least one back pressure hole into the back pressure space is located at a height equal to or lower than a middle height of the balance weight in a direction perpendicular to an axial direction of the driving motor.

14. The compressor of claim 1 , wherein a heat sink chamber is provided on an inner side surface of the casing to forcibly induce a refrigerant toward the inner side surface of the casing.

15. The compressor of claim 14 , wherein the heat sink chamber includes an inlet and an outlet, and
wherein the inlet of the heat sink chamber is provided toward the intake hole, and the outlet of the heat sink chamber is provided to

Assignees

• Lg Electronics Inc

Inventors

• Lee Junggu
• Kim Taekyoung
• Choi Yicheol
• Kim Joohyung
• PARK Ilyoung
• Kim Bumsuk
• Lim Junyoung

Classifications

• F04C29/047 Primary

  Cooling of electronic devices installed inside the pump housing, e.g. inverters · CPC title

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C2240/50

  Bearings · CPC title

• F04C2240/808

  Electronic circuits (e.g. inverters) installed inside the machine · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title