Hermetic compressor including an intermediate plate having a curved suction passage

Patent metadata

Field	Value
Publication number	US-11754071-B2
Application number	US-202117499313-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Mar 20, 2017
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A hermetic compressor includes a casing, a cylinder in the casing, a first bearing and a second bearing defining a compression space together with the cylinder, a roller located at an eccentric position with respect to an inner surface of the cylinder and configured to vary a volume of the compression space, and a vane inserted into the roller to rotate together with the roller, and drawn out toward the inner surface of the cylinder to divide the compression space into compression chambers. An inlet port in communication with the compression space is defined in the first bearing, and an intermediate plate is located between the cylinder and the inlet port and defines a suction passage connected to the inlet port, where a peripheral length of an inner peripheral surface of the suction passage is greater than a peripheral length of an outer peripheral surface of the suction passage.

First claim

What is claimed is:

1. A hermetic compressor comprising:
a casing;
a cylinder located inside of the casing and coupled to the casing, the cylinder defining a compression space surrounded by an inner circumferential surface of the cylinder;
a first bearing located at an upper side of the cylinder;
a second bearing located at a lower side of the cylinder;
a roller located in the compression space and configured to rotate along an eccentric path within the compression space to vary a volume of the compression space based on the rotation of the roller with respect to the cylinder;
a vane that is located in the roller, that is configured to rotate with respect to the cylinder based on the rotation of the roller, and that is configured to, based on the rotation of the roller, protrude toward and retract from the inner circumferential surface of the cylinder, the vane dividing the compression space into a plurality of compression chambers;
an inlet port defined at the first bearing and configured to communicate with the compression space;
a refrigerant suction pipe coupled to the inlet port; and
an intermediate plate located between the cylinder and the inlet port, the intermediate plate defining a suction passage configured to communicate with the inlet port and the compression space,
wherein a sectional area of the suction passage increases along a counter rotational direction of the roller toward a contact point between the inner circumferential surface of the cylinder and an outer circumferential surface of the roller,
wherein the suction passage has:
an outer peripheral surface, and
an inner peripheral surface that is spaced apart from the outer peripheral surface in a radial direction, the inner peripheral surface having a curved shape that extends from a first end of the suction passage to a second end of the suction passage along a circumferential direction of the cylinder,

wherein the inner peripheral surface and the outer peripheral surface of the suction passage extend along the counter rotational direction of the roller from the second end of the suction passage toward the contact point between the inner circumferential surface of the cylinder and the outer circumferential surface of the roller, and
wherein the inner peripheral surface of the suction passage is configured to be located outside of the outer circumferential surface of the roller in the radial direction based on the roller rotating from the first end of the suction passage to the second end of the suction passage.

2. The hermetic compressor of claim 1 , wherein the suction passage has a first side that faces the contact point and a second side that is disposed away from the contact point relative to the first side, and
wherein the sectional area of the suction passage increases from the second side of the suction passage to the first side of the suction passage in the circumferential direction of the cylinder.

3. The hermetic compressor of claim 1 , wherein the suction passage comprises:
a first portion located at a first side with respect to a radial center line that extends from a center of the roller to the suction passage; and
a second portion that is located at a second side with respect to the radial center line and that is located away from the contact point relative to the first portion, and
wherein a sectional area of the second portion is less than a sectional area of the first portion.

4. The hermetic compressor of claim 3 , wherein a cross sectional shape of the suction passage has a first axis and a second axis, and
wherein a length of the suction passage in the first axis is greater than a length of the suction passage in the second axis.

5. The hermetic compressor of claim 1 , wherein the inlet port comprises an outlet located outside of the compression space, and
wherein the inner circumferential surface of the cylinder defines a suction path configured to communicate with the inlet port and the compression space.

6. The hermetic compressor of claim 5 , wherein the suction path is defined at an edge of the inner circumferential surface of the cylinder.

7. The hermetic compressor of claim 6 , wherein the suction path comprises:
a first portion located at a first side with respect to a radial center line that extends from a center of the roller to the suction path; and
a second portion that is located at a second side with respect to the radial center line,
wherein a sectional area of the second portion is less than a sectional area of the first portion, and
wherein the roller is configured to rotate in a direction from the first side of the radial center line to the second side of the radial center line.

8. The hermetic compressor of claim 7 , wherein a cross sectional shape of the suction path has a first axis and a second axis, and
wherein a length of the suction path in the first axis is greater than a length of the suction path in the second axis.

9. The hermetic compressor of claim 5 , wherein the suction path and the inlet port have different shapes from each other.

10. The hermetic compressor of claim 9 , wherein a sectional area of the suction path is less than or equal to a sectional area of the inlet port.

11. The hermetic compressor of claim 1 , wherein a cross sectional shape of the inner circumferential surface of the cylinder is oval.

12. The hermetic compressor of claim 11 , further comprising:
a motor located inside of the casing, the motor including a stator and a rotor;
a rotary shaft that connects the rotor to the roller, the rotary shaft defining an oil passage,
wherein the roller defines a vane slot configured to receive the vane and a back pressure hole located at an inner end of the vane slot, and
wherein the rotary shaft further defines a back pressure chamber configured to communicate with the back pressure hole in the roller and the oil passage of the rotary shaft.

13. The hermetic compressor of claim 1 , wherein the vane is one of a plurality of vanes arranged about a center of the roller.

14. A hermetic compressor comprising:
a cylinder that defines a compression space surrounded by an inner circumferential surface of the cylinder;
a first bearing located at an upper side of the cylinder;
a second bearing located at a lower side of the cylinder;
an inlet port defined at the first bearing or the second bearing and configured to communicate with the compression space;
a roller located in the compression space and configured to rotate along an eccentric path within the compression space to vary a volume of the compression space based on the rotation of the roller with respect to the cylinder;
a vane that is located in the roller, that is configured to rotate with respect to the cylinder based on the rotation of the roller, and that is configured to, based on the rotation of the roller, protrude toward and retract from the inner circumferential surface of the cylinder, the vane dividing the compression space into a plurality of compression chambers; and
an intermediate plate located between the cylinder and the inlet port, the intermediate plate defining a suction passage configured to communicate with the inlet port and the compression space,
wherein the suction passage has:
an outer peripheral surface, and
an inner peripheral surface that is spaced apart from the outer peripheral surface in a radial direction, the inner peripheral surface having a curved shape that extends from a first end of the suction passage to a second end of the suction passage along a circumferential direction of the cylinder,

wherein the inner peripheral surface and the outer peripheral surface

Assignees

• Lg Electronics Inc

Inventors

• Moon Seokhwan
• Kang Seoungmin
• Shin Jinung

Classifications

• F04C23/008 Primary

  Hermetic pumps · CPC title

• F04C18/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title

• F04C15/06 Primary

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

• F04C18/3564

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04C29/128

  of the elastic type, e.g. reed valves · CPC title