Hermetic compressor having inlet port arrangement including a suction passage defined in an intermediate plate

Patent metadata

Field	Value
Publication number	US-11174865-B2
Application number	US-201815926254-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Mar 20, 2017
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

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, the first bearing defining an upper portion of the compression space together with the cylinder;
a second bearing located at a lower side of the cylinder, the second bearing defining a lower portion of the compression space together with the cylinder;
a roller that is located in the compression space and that is configured to rotate along an eccentric path within the compression space to vary a volume of the compression space based on 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 rotation of the roller, and that is configured to, based on 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 in the first bearing;
a refrigerant suction pipe that is inserted into the inlet port through the casing and that is 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 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 inlet port is configured to communicate with the compression space through the suction passage, the inlet port comprising:
a first hole that is defined in a plate portion of the first bearing and that extends from an outer circumferential surface of the plate portion toward a shaft accommodating portion of the first bearing, and
a second hole that extends from an inner end of the first hole toward the suction passage and that penetrates a surface of the plate portion facing the suction passage, wherein each of the first hole and the second hole has a circular cross-sectional shape,
wherein the inner peripheral surface and the outer peripheral surface of the suction passage extend from the second end of the suction passage toward a contact point between the inner circumferential surface of the cylinder and an outer circumferential surface of the roller, and
wherein a peripheral length of the inner peripheral surface of the suction passage is greater than a peripheral length of the outer peripheral surface of the suction passage.

2. 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, a sectional area of the second portion being 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.

3. The hermetic compressor of claim 2 , 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.

4. 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 passage that allows the inlet port and the compression space to communicate with each other.

5. The hermetic compressor of claim 4 , wherein the suction passage is defined at an edge of the inner circumferential surface of the cylinder.

6. The hermetic compressor of claim 5 , 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, a sectional area of the second portion being 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.

7. The hermetic compressor of claim 6 , wherein a cross sectional shape of the suction passage 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.

8. The hermetic compressor of claim 1 , wherein a sectional area of the suction passage is less than or equal to a sectional area of the inlet port.

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

10. The hermetic compressor of claim 9 , further comprising:
a motor located inside of the casing, the motor including a stator and a rotor;
a rotary shaft that connects the rotor of the motor 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.

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

12. 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, the first bearing defining an upper portion of the compression space with the cylinder; and
a second bearing located at a lower side of the cylinder, the second bearing defining a lower portion of the compression space together with the cylinder;
an inlet port defined at the first bearing;
a roller that is located in the compression space and that is configured to rotate along an eccentric path within the compression space to vary a volume of the compression space based on 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 rotation of the roller, and that is configured to, based on 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 inlet

Assignees

• Lg Electronics Inc

Inventors

• Moon Seokhwan
• Kang Seoungmin
• Shin Jinung

Classifications

• F04C2240/50

  Bearings · CPC title

• F04C2240/40

  Electric motor · CPC title

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title

• F04B39/1073

  the members being reed valves · CPC title

• F04C18/10

  of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member · CPC title