Scroll compressor having discharge cover providing a space to guide a discharge flow from a discharge port to a discharge passgae formed by a plurality of discharge holes

Patent metadata

Field	Value
Publication number	US-11293442-B2
Application number	US-201916378653-A
Country	US
Kind code	B2
Filing date	Apr 9, 2019
Priority date	Apr 9, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A scroll compressor may include a first scroll and a second scroll orbiting relative to the first scroll to form compression chambers, a discharge port provided in the first scroll to discharge refrigerant compressed in the compression chamber, a discharge passage formed through the first discharged through the discharge to an upper side of the frame, and a discharge cover coupled to the first scroll and having a space to accommodate end portions of the discharge port and the discharge passage to guide the refrigerant discharged through the discharge port to the discharge passage. A volume of a discharge space defined in the space by the first scroll may be 4.5 or more, obtained by dividing a volume of the discharge space by a total volume of an initial compression chamber among the compression chambers.

First claim

What is claimed is:

1. A scroll compressor, comprising:
a casing;
a motor provided in an inner space of the casing and having an inner passage and an outer passage penetrating the motor in an axial direction;
a shaft rotatably coupled to the motor;
a frame provided below the motor such that a space is provided between the frame and the motor, and the shaft penetrates the space and is supported by the frame;
a first scroll provided at a lower side of the frame, the first scroll having a fixed wrap formed on a surface of the first scroll, and a discharge port and a discharge passage formed through the first scroll;
a second scroll provided between the frame and the first scroll having an orbiting wrap engaged with the fixed wrap, wherein the shaft is provided within and coupled to the second scroll to overlap the orbiting wrap in a radial direction, and compression chambers are formed between the second scroll and the first scroll as the second scroll orbits with respect to the first scroll; and
a discharge cover coupled to the first scroll and having a recess to accommodate an end of the discharge port and an end of the discharge passage so that the refrigerant discharged through the discharge port is guided to the discharge passage, wherein a discharge space is provided between the discharge cover and the first scroll, and the discharge space has a volume ratio of 4.5 or more, the volume ratio obtained by dividing a volume of the discharge space by a volume of an initial compression chamber among the compression chambers, wherein the discharge cover comprises:
a housing forming the discharge space, wherein the housing is provided with at least one discharge guide groove and a sealing portion, the at least one discharge guide groove being recessed outward in an inner surface of a side wall of the housing and the sealing portion being a portion of the inner surface that does not include the discharge guide groove and that contacts an outer circumferential surface of the first scroll; and
a flange extending from an outer circumferential surface of the housing and coupled to the first scroll, wherein:
a portion of the flange that extends from the outer circumferential surface of the housing at a position defining the sealing portion is provided with at least one oil collecting groove recessed by a predetermined depth,
the discharge passage communicates with the discharge guide groove, and
the first scroll and the frame are provided with a plurality of oil passages penetrating the first scroll and the frame in an axial direction, and the oil passages communicate with the at least one oil collecting groove.

2. The scroll compressor of claim 1 , wherein the discharge passage has a position that corresponds to a position of the discharge guide groove so as to communicate with the discharge guide groove.

3. The scroll compressor of claim 2 , wherein the discharge cover is provided with at least one space expansion groove recessed in the inner surface of the side wall of the housing toward an outer circumferential surface of the side wall of the housing to be spaced apart from the outer circumferential surface of the first scroll, and wherein a position of the discharge passage does not correspond to a position of the space expansion groove.

4. The scroll compressor of claim 3 , wherein the discharge guide groove has an arc length that is smaller than or equal to a total arc length of a portion of the inner surface of the side wall of the housing that does not include the discharge guide groove.

5. The scroll compressor of claim 1 , wherein the discharge guide groove is provided with a guide surface that is inclined from a radial side surface of the discharge cover toward a bottom surface of the discharge cover.

6. The compressor of claim 1 , wherein a passage separator is formed by the frame and the motor and provided between the discharge passage and the oil passage in the radial direction.

7. The compressor of claim 6 , wherein the passage separator comprises:
a first passage guide extending from the frame;
a second passage guide extending from the motor; and
a seal provided between the first passage guide and the second passage guide.

8. A scroll compressor, comprising:
a casing having an inner space in which oil is stored;
a motor provided in the inner space of the casing;
a shaft coupled to the motor;
a frame provided at a side of the motor and having a frame-side discharge passage penetrating the frame in an axial direction;
a first scroll having at least one discharge port formed at a side of the frame and having a scroll-side discharge passage penetrating the first scroll in an axial direction so as to communicate with the frame-side discharge passage;
a second scroll provided between the frame and the first scroll to form compression chambers together with the first scroll while orbiting with respect to the first scroll, the compression chambers including an initial compression chamber formed at an outer side, a final compression chamber formed at an inner side, and at least one intermediate compression chamber between the initial compression chamber and the final compression chamber; and
a discharge cover coupled to the first scroll and having a recess to accommodate an end of the discharge port and an end of the discharge passage so that the refrigerant discharged through the discharge port is guided to the discharge passage, wherein a first volume defined by the recess and the first scroll is larger than a second volume of the initial compression chamber, wherein:
an outer circumferential surface of the first scroll is inserted into an inner surface of the discharge cover,
the discharge cover is provided with at least one discharge guide groove recessed in an inner surface of a side wall of the discharge cover toward an outer circumferential surface of the side wall to be spaced apart from the outer circumferential surface of the first scroll, the inner surface of the side wall of the discharge cover being opposite the outer circumferential surface of the side wall, and
the discharge passage has a position that corresponds to a position of the discharge guide groove so as to communicate with the discharge guide groove.

9. The compressor of claim 8 , wherein a volume ratio defined by dividing the first volume by the second volume is at least 4.5.

10. The compressor of claim 9 , wherein the volume ratio is 15 or less.

11. A compressor, comprising:
a casing;
a motor provided inside the casing, the motor having a rotor and a stator;
a compression device;
an intermediate space provided between the compression device and the motor; and
a shaft coupled to the motor and penetrating the intermediate space to transfer a drive force of the motor to the compression device, wherein the compression device includes:
a compression chamber;
a discharge cover having a recess;
a discharge space defined by the discharge cover and a lower surface of the compression device, wherein the discharge space includes the recess;
a plurality of discharge ports to discharge compressed refrigerant from the compression chamber to the discharge space; and
a first discharge passage to connect the intermediate space and the discharge space, wherein:
the discharge cover is configured to guide refrigerant discharged from the plurality of discharge ports to the discharge passage,
the discharge space has a first volume, the compression chamber has a second volume, and a volume ratio of the first volume and the second volume is predetermined,
an outer circumferential surface of a fixed scroll of the compression device is inserted into an inner surface of a side wall of the discharge cover,

Assignees

• Lg Electronics Inc

Inventors

• Jeon Nayoung
• Kim Taekyoung
• Kim Cheolhwan

Classifications

• F04C23/008

  Hermetic pumps · CPC title

• F04C29/065

  Noise dampening volumes, e.g. muffler chambers · CPC title

• F04C2270/14

  Pulsations · CPC title

• F04C29/12 Primary

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

• F04C29/0035

  Equalization of pressure pulses (silencing F04C29/06) · CPC title