ROTARY COMPRESSOR

• US 20170335848A1
• Filed: 12/11/2015
• Published: 11/23/2017
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: MOROZUMI, Naoya, MORISHITA, Taku, FURUKAWA, Motonobu, KATAYAMA, Hiroki, TANAKA, Junya
• Granted Patent: US 10,458,408 B2
• Time in Patent Office: Days
• CPC Class Codes: F01C 21/108 with an axial surface, e.g. side plates
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 2210/26 Refrigerants with particular properties, e.g. HFC-134a
• CPC Class Codes: F04C 2240/30 Casings or housings
• CPC Class Codes: F04C 2240/40 Electric motor
• CPC Class Codes: F04C 2240/50 Bearings
• CPC Class Codes: F04C 2240/60 Shafts
• CPC Class Codes: F04C 2250/102 of the outlet
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0057 for eccentric movement
• CPC Class Codes: F04C 29/0085 Prime movers
• CPC Class Codes: F04C 29/128 of the elastic type, e.g. reed valves

Abstract

In a rotary compressor, a lower end plate cover is formed in a flat plate shape, a lower discharge chamber concave portion is formed in a lower end plate to overlap a lower discharge hole side of a lower discharge valve accommodation concave portion, and the lower discharge chamber concave portion is formed in a fan-like range between a diametrical line passing through a center of a sub-bearing unit and a midpoint of a line segment connecting a center of the lower discharge hole and a center of a lower rivet to each other and a diametrical line opened by a pitch angle 90° in a direction of the lower discharge hole about the center of the sub-bearing unit. At least a portion of a refrigerant path hole overlaps the lower discharge chamber concave portion and is disposed at a position communicating with the lower discharge chamber concave portion.

Claims

1. A rotary compressor, comprising:

a sealed vertically-placed cylindrical compressor housing in which a discharge pipe for discharging refrigerant is provided in an upper portion thereof and an upper inlet pipe and a lower inlet pipe for sucking refrigerant are provided in a side surface lower portion thereof;

an accumulator which is fixed to a side portion of the compressor housing and is connected to the upper inlet pipe and the lower inlet pipe;

a motor which is disposed in the compressor housing; and

a compressing unit which is disposed in a lower side of the motor in the compressor housing, is driven by the motor to suck and compress refrigerant from the accumulator via the upper inlet pipe and the lower inlet pipe, and discharges the compressed refrigerant from the discharge pipe,

wherein the compressing unit includes

an annular upper cylinder and an annular lower cylinder,

an upper end plate which closes an upper side of the upper cylinder and a lower end plate which closes a lower side of the lower cylinder,

a intermediate partition plate which is disposed between the upper cylinder and the lower cylinder and closes a lower side of the upper cylinder and an upper side of the lower cylinder,

a rotation shaft which is supported by a main bearing unit provided on the upper end plate and a sub-bearing unit provided on the lower end plate and which is rotated by the motor,

an upper eccentric portion and a lower eccentric portion which are provided to the rotation shaft with a phase difference of 180°

with respect to each other,

an upper piston which is fitted in the upper eccentric portion and revolves along an inner circumferential surface of the upper cylinder to form an upper cylinder chamber in the upper cylinder,

a lower piston which is fitted in the lower eccentric portion and revolves along an inner circumferential surface of the lower cylinder to form a lower cylinder chamber in the lower cylinder,

an upper vane which protrudes from an upper vane groove provided in the upper cylinder into the upper cylinder chamber and abuts on the upper piston to divide the upper cylinder chamber into an upper inlet chamber and an upper compression chamber,

a lower vane which protrudes from a lower vane groove provided in the lower cylinder into the lower cylinder chamber and abuts on the lower piston to divide the lower cylinder chamber into a lower inlet chamber and a lower compression chamber,

an upper end plate cover which covers the upper end plate, forms an upper end plate cover chamber between the upper end plate and the upper end plate cover, and includes an upper end plate cover discharge hole for communicating the upper end plate cover chamber and an inside portion of the compressor housing with each other,

a lower endplate cover which covers the lower end plate and forms a lower end plate cover chamber between the lower end plate and the lower end plate cover,

an upper discharge hole which is provided in the upper endplate and communicates the upper compression chamber and the upper end plate cover chamber with each other,

a lower discharge hole which is provided in the lower endplate and communicates the lower compression chamber and the lower end plate cover chamber with each other, and

a refrigerant path hole which passes through the lower end plate, the lower cylinder, the intermediate partition plate, the upper end plate and the upper cylinder and communicates the lower end plate cover chamber and the upper end plate cover chamber with each other, and

the rotary compressor, further comprising;

an upper discharge valve accommodation concave portion which is provided in the upper end plate and extends in a groove shape from a position of the upper discharge hole;

a lower discharge valve accommodation concave portion which is provided in the lower end plate and extends in a groove shape from a position of the lower discharge hole;

a reed valve type upper discharge valve of which a rear end portion is fixed by an upper rivet in the upper discharge valve accommodation concave portion and a front portion opens and closes the upper discharge hole and an upper discharge valve cap of which a rear end portion is overlapped with the upper discharge valve and is fixed in the upper discharge valve accommodation concave portion by the upper rivet and a front portion is warped to regulate opening degree of the upper discharge valve; and

a reed valve type lower discharge valve of which a rear end portion is fixed by a lower rivet in the lower discharge valve accommodation concave portion and a front portion opens and closes the lower discharge hole and a lower discharge valve cap of which a rear end portion is overlapped with the lower discharge valve and is fixed in the lower discharge valve accommodation concave portion by the lower rivet, a front portion is warped to regulate opening degree of the lower discharge valve, and is accommodated in the lower discharge valve accommodation concave portion,

wherein the lower end plate cover is formed in a flat plate shape,

wherein a lower discharge chamber concave portion is formed in the lower end plate so as to overlap the lower discharge hole side of the lower discharge valve accommodation concave portion, and the lower discharge chamber concave portion is formed in a fan-like range between a diametrical line which passes through a center of the sub-bearing unit and a midpoint of a line segment which connects a center of the lower discharge hole and a center of the lower rivet to each other and a diametrical line which is opened by a pitch angle 90°

in a direction of the lower discharge hole about a center of the sub-bearing unit,

wherein at least a portion of the refrigerant path hole overlaps with the lower discharge chamber concave portion and is disposed at a position communicating with the lower discharge chamber concave portion, and

wherein the lower end plate cover chamber is configured by the lower discharge chamber concave portion and the lower discharge valve accommodation concave portion.

2. The rotary compressor according to claim 1,

wherein a lower valve seat raised in an annular shape is included at a circumferential edge of the lower discharge hole and a depth to the lower valve seat of the lower discharge chamber concave portion is formed to be 1.5 times or less of a diameter φ

D1 of the lower discharge hole.

3. The rotary compressor according to claim 1,

wherein a lower valve seat raised in an annular shape is included at a circumferential edge of the lower discharge hole, the lower end plate cover includes a concave portion in a portion facing a front end portion of the lower discharge valve cap, and a depth from the concave portion to the lower valve seat is formed to be 1.5 times or less of a diameter φ

D1 of the lower discharge hole.

4. The rotary compressor according to claim 1,

wherein a front end portion of the lower discharge valve cap is formed so that a thickness of a portion close to the lower end plate cover is thinner than that of the other portion thereof.

5. The rotary compressor according to claim 1,

wherein the refrigerant path hole is configured by a plurality of circular holes.

6. The rotary compressor according to claim 1,

wherein the refrigerant path hole is a long hole along a circumferential direction of a lower valve seat of the lower discharge hole.

7. The rotary compressor according to claim 1,

wherein a refrigerant introduction portion which communicates with the lower discharge chamber concave portion or the lower discharge valve accommodation concave portion is formed in the lower end plate or the lower end plate cover as a groove having an annular depth of 1 mm or less surrounding the sub-bearing unit of the lower end plate.

8. The rotary compressor according to claim 1,

wherein a refrigerant discharge portion, which discharges the refrigerant into the compressor housing, is provided in the lower end plate cover, and the refrigerant discharge portion directly connects an inside of the compressor housing and the lower discharge chamber concave portion, the lower discharge valve accommodation concave portion, or the refrigerant introduction portion.