WO2004040141A1 - Hermetic compressor having a z-plate - Google Patents

Hermetic compressor having a z-plate Download PDF

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Publication number
WO2004040141A1
WO2004040141A1 PCT/KR2003/001484 KR0301484W WO2004040141A1 WO 2004040141 A1 WO2004040141 A1 WO 2004040141A1 KR 0301484 W KR0301484 W KR 0301484W WO 2004040141 A1 WO2004040141 A1 WO 2004040141A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressor
rotation shaft
friction reducing
thrust
contacted
Prior art date
Application number
PCT/KR2003/001484
Other languages
French (fr)
Inventor
Young-Jong Kim
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020020067229A external-priority patent/KR20040038332A/en
Priority claimed from KR1020020068536A external-priority patent/KR20040040189A/en
Priority claimed from KR1020020068537A external-priority patent/KR20040040190A/en
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to AU2003301697A priority Critical patent/AU2003301697A1/en
Publication of WO2004040141A1 publication Critical patent/WO2004040141A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C18/3568—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member with axially movable vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/023—Lubricant distribution through a hollow driving shaft

Definitions

  • Figure 1 is a longitudinal section view of a rotary compressor having a Z- plate in accordance with the conventional art.
  • the upper and lower bearings are respectively composed of a radial bearing portion for supporting the rotation shaft in a radius direction, and a thrust bearing portion for supporting the rotation shaft in a shaft direction.
  • a thrust bearing portion for supporting the rotation shaft in a shaft direction.
  • the friction reducing members are inserted to the insertion grooves formed at the upper and lower bearings with a disc shape of which center portion is opened.
  • the friction reducing members are rolling-contactedly inserted to the insertion grooves formed at the thrust bearing portion of the upper and lower bearings, and are composed of a ball bearing rolling-contacted to the thrust supporting portion of the rotation shaft.
  • Figure 2 is a disassembled perspective view of a compression unit of the compressor having a Z-plate in accordance with the conventional art
  • Figure 3 is an engaged section view of the compression unit of the compressor having a Z-plate in accordance with the conventional art
  • the oil groove 46 of the friction reducing members 32 and 34 is formed to have a predetermined depth towards a circumference direction. Also, as another embodiment of the friction reducing members 32 and 34, as shown in Figure 8, minute poly-holes 48 in which oil is filled can be formed. To the oil supply passage 35 of the rotation shaft 24, an oil guide passage 37 for supplying oil to the friction reducing member 32 is connected.
  • the friction reducing members 32 and 34 respectively have one side inserted to the insertion grooves 42 and 44 formed at the upper and lower bearings 20 and 22 to be rotatably supported and the other side contacted to the thrust supporting portion 41 of the rotation shaft 24 to rotate when the rotation shaft 24 is rotated, thereby minimizing a friction between the thrust supporting portion 41 and the thrust bearing portion 38 of the upper and lower bearings 20 and 22.
  • the ball bearings 60 and 62 are respectively composed of a ball retainer 68 formed as a ring type having a predetermined width and a height, and a plurality of balls 70 rotatably arranged with a predetermined interval towards a circumference direction of the ball retainer 68.
  • the compression unit according to the sixth embodiment is equal to that explained in the fifth embodiment except that the friction reducing members 90 and 91 are sliding-inserted to the insertion grooves 96 and 98 formed at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Rotary Pumps (AREA)

Abstract

A hermetic compressor having a Z-plate comprises: a cylinder fixed in a casing for forming a compression chamber; upper and lower bearings (20, 22) hermetically mounted at upper and lower surfaces of the cylinder (19), respectively for forming the compression chamber (14, 16) with the cylinder (19); a rotation shaft (24) connected to a driving unit (12) and rotatably supported at the upper and lower bearings (20, 22); a Z-plate (26) engaged at an outer circumference surface of the rotation shaft (24) for dividing the compression chamber (14, 16) into a first compression chamber (14) and a second compression chamber (16); and friction reducing members (32, 34) arranged at thrust surfaces between the rotation shaft (24) and the upper and lower bearings (20, 22) for reducing a friction therebetween. The compressor reduces the friction between the rotation shaft (24) and the upper and lower bearings (20, 22) thereby increasing a performance and a reliability of the compressor.

Description

HERMETIC COMPRESSOR HAVING A Z-PLATE
TECHNICAL FIELD
The present invention relates to a compressor having a Z-plate which is a kind of a rotary compressor, and more particularly, to a hermetic compressor having a Z-plate which can minimize a friction loss between thrust surfaces in the compressor.
BACKGROUND ART In general, a compressor is a device for converting mechanical energy into compression energy of a compression fluid. A hermetic compressor is divided into a reciprocating compressor, a scroll compressor, a centrifugal compressor, and a rotary compressor by a compression method.
Figure 1 is a longitudinal section view of a rotary compressor having a Z- plate in accordance with the conventional art.
The conventional compressor having a Z-plate comprises: a casing 106 which is hermetic and connected by a suction pipe 102 for sucking a fluid and a discharge pipe 104 for discharging the compressed fluid; a driving unit 112 arranged at an upper portion of an inner side of the casing 106 and having a rotor 108 and a stator 112 for generating a driving force; and a compression unit 114 arranged at a lower portion of the inner side of the casing 106 and connected to the driving unit 112 for compressing the fluid sucked into the suction pipe 102 and thus discharging to the discharge pipe 104. The compression unit 114, as shown in Figures 2 and 3, comprises: a cylinder 120 fixed at a lower portion of the casing 106 for forming compression chambers 116 and 118 connected to the suction pipe 102; upper and lower bearings 122 and 124 respectively fixed to upper and lower surfaces of the cylinder 102 for forming the compression chambers 116 and 118 with the cylinder 120; a rotation shaft 126 fixed to the rotor 108 of the driving unit 112 and rotatably supported at the upper and lower bearings 122 and 124 for transmitting a driving force of the driving unit 112 to the compression unit 114; a Z-plate 128 formed at an outer circumference surface of the rotation shaft 126 for dividing the compression chambers 116 and 118 into the first compression chamber 116 and the second compression chamber 118; first and second vanes 130 and 132 respectively contacted to upper and lower surfaces of the Z-plate 128 for dividing the first and second compression chambers 116 and 118 into a suction region and a compression region at the time when the rotation shaft 126 is rotated; and a vane spring 134 elastically supported at both ends of the first and second vanes 130 and 132.
The upper and lower bearings 122 and 124 are respectively composed of a radial bearing portion 136 of a cylindrical shape through which the rotation shaft 126 passes for supporting the rotation shaft 126 in a radius direction; and a thrust bearing portion 138 integrally formed with the radial bearing portion 136 as a disc plate for supporting the rotation shaft 126 in a shaft direction.
The rotation shaft 126 is composed of a radial supporting portion 140 inserted to the radial bearing portion 136 of the upper and lower bearings 122 and 124 and thus rotatably supported; and a thrust supporting portion 142 extended from the radial supporting portion 140 with a predetermined diameter and rotatably supported at the thrust bearing portion 138 of the upper and lower bearings 122 and 124. The Z-plate 142 is formed as a disc plate type at the time of a plane projection so that an outer circumference surface thereof can be slide-contacted to an inner circumference surface of the cylinder 120, and forms a curved surface of a sine wave in a lateral surface at the time of being unfolded.
Operations of the conventional compressor having the Z-plate will be explained.
If a power is applied to the driving unit 112 and thus the rotor 108 is rotated, the rotation shaft 126 engaged to the rotor 108 is rotated towards one direction with the Z-plate 128, and the vanes 130 and 132 respectively contacted to both surfaces of upper and lower sides of the Z-plate 128 reciprocate in opposite directions each other along a height of the Z-plate 128. According to this, if capacities of the first and second compression chambers 116 and 118 are varied, a new fluid is simultaneously sucked to the first and second compression chambers 116 and 118 through the suction pipe 102, compressed, and discharged through the discharge pipe 104 at a moment when an upper dead point or a lower dead point of the Z-plate 128 reaches to a discharge starting point.
Like this, when the compressor is operated, the radial supporting portion 140 of the rotation shaft 126 is supported to an inner circumference surface of the radial bearing portion 136 of the upper and lower bearings 122 and 124 towards the radius direction, and the thrust supporting portion 142 of the rotation shaft 126 is supported at upper and lower surfaces of the thrust bearing portion 138 of the upper and lower bearings 122 and 124 towards the shaft direction. However, in the conventional compressor having the Z-plate, in case that the radial supporting portion of the rotation shaft and the thrust supporting portion make concentricity, a twisting moment is less. According to this, the rotation shaft is fast rotated, a concentrated load is applied to the thrust supporting portion, and thus, a friction between the thrust supporting portion of the rotation shaft and the thrust bearing portion of the upper and lower bearings becomes severe. As the result, a performance of the compressor is lowered by the friction loss and a reliability of the compressor is lowered by abrasion of the friction surface.
DISCLOSURE OF THE INVENTION
Therefore, it is an object of the present invention to provide a compressor having a Z-plate which can improve a performance and a reliability of a compressor by installing friction reducing membersto prevent a friction between thrust surfaces of the rotation shaft and upper and lower bearings and thus reducing a friction therebetween.
To achieve these objects, there is provided a compressor having a Z-plate comprising: a cylinder fixed in a casing for forming a compression chamber; upper and lower bearings hermetically mounted at upper and lower surfaces of the cylinder, respectively for forming the compression chamber with the cylinder; a rotation shaft connected to a driving unit and rotatably supported at the upper and lower bearings; a Z-plate engaged at an outer circumference surface of the rotation shaft for dividing the compression chamber into a first compression chamber and a second compression chamber; and friction reducing members installed at thrust surfaces between the rotation shaft and the upper and lower bearings for reducing a friction therebetween.
The upper and lower bearings are respectively composed of a radial bearing portion for supporting the rotation shaft in a radius direction, and a thrust bearing portion for supporting the rotation shaft in a shaft direction. Herein, at the thrust bearing portion, insertion grooves for inserting the friction reducing members rotatably are formed.
The friction reducing members are inserted to the insertion grooves formed at the upper and lower bearings with a disc shape of which center portion is opened.
Either at the upper surface or at the lower surface of the friction reducing member, an oil groove for lubrication is formed.
The friction reducing members are rolling-contactedly inserted to the insertion grooves formed at the thrust bearing portion of the upper and lower bearings, and are composed of a ball bearing rolling-contacted to the thrust supporting portion of the rotation shaft.
The friction reducing members comprises: a first sliding plate inserted to the insertion grooves formed at the thrust bearing portion of the upper and lower bearings; a second sliding plate contacted to the thrust supporting portion of the rotation shaft; and a plurality of balls rolling-contacted between the first sliding plate and the second sliding plate.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a longitudinal section view showing a compressor having a Z- compressor in accordance with the conventional art;
Figure 2 is a disassembled perspective view of a compression unit of the compressor having a Z-plate in accordance with the conventional art; Figure 3 is an engaged section view of the compression unit of the compressor having a Z-plate in accordance with the conventional art;
Figure 4 is a longitudinal section view of a compressor having a Z-plate according to the present invention;
Figure 5 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to one embodiment of the present invention;
Figure 6 is an engaged section view of the compression unit of the compressor having a Z-plate according to one embodiment of the present invention; Figure 7 is a front view of a friction preventing member according to one embodiment of the present invention;
Figure 8 is a frontal view showing a modification example of the friction preventing member according to one embodiment of the present invention; Figure 9 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a second embodiment of the present invention;
Figure 10 is an engaged section view of the compression unit of the compressor having a Z-plate according to the second embodiment of the present invention;
Figure 11 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a third embodiment of the present invention; Figure 12 is an engaged section view of the compression unit of the compressor having a Z-plate according to the third embodiment of the present invention;
Figure 13 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a fourth embodiment of the present invention;
Figure 14 is an engaged section view of the compression unit of the compressor having a Z-plate according to the fourth embodiment of the present invention;
Figure 15 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a fifth embodiment of the present invention;
Figure 16 is an engaged section view of the compression unit of the compressor having a Z-plate according to the fifth embodiment of the present invention;
Figure 17 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a sixth embodiment of the present invention; and Figure 18 is an engaged section view of the compression unit of the compressor having a Z-plate according to the sixth embodiment of the present invention.
MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiment of the compressor having a Z-plate according to the present invention will be explained with reference to attached drawings.
Figure 4 is a longitudinal section view of a compressor having a Z-plate according to the present invention. The compressor having a Z-plate according to the present invention comprises: a casing 6 to which a suction pipe 2 for sucking a fluid and a discharge pipe 4 for discharging the compressed fluid are respectively connected; a driving unit 12 arranged at an upper portion of an inner side of the casing 6 and having a rotor 8 and a stator 10 for generating a driving force; and a compression unit 14 connected to the rotor 8 of the driving unit 12 for compressing the fluid sucked into the suction pipe 2 and thus discharging to the discharge pipe 4.
The compression unit 14, as shown in Figures 5 and 6, comprises: a cylinder 18 fixed at a lower portion of the casing 1 for forming compression chambers 14 and 16; upper and lower bearings 20 and 22 respectively hermetically mounted at upper and lower surfaces of the cylinder 18, respectively for forming the compression chambers 14 and 16 with the cylinder 18; a rotation shaft 24 engaged to the rotor 8 of the driving unit 12 and rotatably supported at the upper and lower bearings 20 and 22 for transmitting a driving force generated at the driving unit 12 to the compression unit 14; a Z-plate 26 formed at an outer circumference surface of the rotation shaft 24 for dividing the compression chamber into a first compression chamber 14 and a second compression chamber 16; first and second vanes 28 and 30 respectively contacted to upper and lower surfaces of the Z-plate 26 for dividing the first and second compression chambers 14 and 16 into a suction region and a compression region at the time when the rotation shaft 24 is rotated; and friction reducing members 32 and 34 installed at thrust surfaces between the rotation shaft 24 and the upper and lower bearings 20 and 22 for reducing a friction therebetween. The upper and lower bearings 20 and 22 are disc shapes hermetically fixed to the upper and lower surfaces of the cylinder 18, respectively, and are composed of a radial bearing portion 36 for supporting the rotation shaft 24 in a radius direction at a center thereof; and a thrust bearing portion 38 for supporting the rotation shaft 24 in a shaft direction at the lower surface of the upper bearing 20 and at the upper surface of the lower bearing 22.
The rotation shaft 24 is composed of a radial supporting portion 40 inserted to the radial bearing portion 36 of the upper and lower bearings 20 and 22 and thus rotatably supported; and a thrust supporting portion 41 extended from the radial supporting portion 40 with a predetermined diameter and rotatably supported at the thrust bearing portion 38 of the upper and lower bearings 20 and 22. Also, at a center of the rotation shaft 24, an oil supplying passage 35 for supplying oil contained in a lower portion of the casing 6 to each friction part is formed.
Insertion grooves 42 and 44 for rotatably inserting the friction reducing members 32 and 34 are formed at the thrust bearing portion 38 of the upper and lower bearings 20 and 22. The insertion grooves 42 and 44 are formed as a ring shape towards a circumference direction at a center of the upper and lower bearings 20 and 22 through which the rotation shaft 24 passes.
Depths of the insertion grooves 42 and 44 are formed to be horizontal with the lower surface of the upper bearing 20 and the upper surface of the lower bearing 22 when the friction reducing members 32 and 34 are inserted thereto. Also, inner diameters of the insertion grooves 42 and 44 are preferably formed to be larger than outer diameters of the friction reducing members 32 and 34 so that the friction reducing members 32 and 34 can be rotated.
The friction reducing members are inserted to the insertion grooves 42 and 44 formed at the upper and lower bearings 20 and 22 and rotate with a disc shape of which center portion is opened. Also, an oil groove 46 for lubrication is respectively formed at the upper and lower surfaces thereof.
The oil groove 46 of the friction reducing members 32 and 34, as shown in Figure 7, is formed to have a predetermined depth towards a circumference direction. Also, as another embodiment of the friction reducing members 32 and 34, as shown in Figure 8, minute poly-holes 48 in which oil is filled can be formed. To the oil supply passage 35 of the rotation shaft 24, an oil guide passage 37 for supplying oil to the friction reducing member 32 is connected.
The friction reducing members 32 and 34 respectively have one side inserted to the insertion grooves 42 and 44 formed at the upper and lower bearings 20 and 22 to be rotatably supported and the other side contacted to the thrust supporting portion 41 of the rotation shaft 24 to rotate when the rotation shaft 24 is rotated, thereby minimizing a friction between the thrust supporting portion 41 and the thrust bearing portion 38 of the upper and lower bearings 20 and 22.
Operations of the compressor having a Z-plate according to the present invention will be explained.
If a power is applied to the driving unit 12 and thus the rotation shaft 24 is rotated, the Z-plate 26 engaged to the rotation shaft 24 is rotated towards one direction in the cylinder 18. According to this, capacities of the first and second compression chambers 14 and 16 are varied, and a fluid is simultaneously sucked to the first and second compression chambers 14 and 16 through the suction pipe 2, compressed by being moved along the Z-plate 26, and discharged to the discharge pipe 4. Like this, when the compressor is operated, the radial supporting portion
40 of the rotation shaft 24 is inserted to the radial bearing portion 36 of the upper and lower bearings 20 and 22, so that a load is supported towards the radius direction of the rotation shaft 24. Also, the thrust supporting portion 41 is sliding- contacted to the friction reducing members 32 and 34 rotatably inserted to the insertion grooves 42 and 44 formed at the thrust bearing portion 38, so that a load is supported towards the shaft direction of the rotation shaft 24.
At this time, the friction reducing members 32 and 34 are rotated by being contacted between the thrust supporting portion 41 of the rotation shaft 24 and the thrust bearing portion 38 of the upper and lower bearings 20 and 22 in a state of being inserted to the insertion grooves 42 and 44 formed at the upper and lower bearings 20 and 22, thereby reducing a friction between the rotation shaft 24 and the upper and lower bearings 20 and 22. Also, the oil groove 46 is respectively formed at both sides of the friction reducing members 32 and 34 to perform the lubrication operation between the thrust bearing portion 38 of the upper and lower bearings 20 and 22 and one side of the friction reducing members 32 and 34 and to perform the lubrication operation between the thrust supporting portion 41 of the rotation shaft 24 and the other side of the friction reducing members 32 and 34, thereby greatly reducing the friction therebetween.
Figure 9 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a second embodiment of the present invention, and Figure 10 is an engaged section view of the compression unit of the compressor having a Z-plate according to the second embodiment of the present invention.
The compression unit 14 of the compressor having the Z-plate according to the second embodiment of the present invention has a structure that the friction reducing members 32 and 34 are respectively sliding-inserted to the insertion grooves 50 and 52 formed at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24.
Herein, the insertion grooves 50 and 52 are formed as a ring type having a predetermined width and a depth towards a circumference direction at the upper and lower surfaces of the thrust supporting portion 41, to which the friction reducing members 32 and 34 having a predetermined thickness and a disc shape of which center portion is opened are inserted.
At the upper and lower surfaces of the friction reducing members 32 and 34, the oil groove 46 or the minute poly-holes 48 are respectively formed.
In the compression unit 14 according to the second embodiment of the present invention, the friction reducing members 32 and 34 are rotatably inserted to the insertion grooves 50 and 52 formed at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24, and the friction reducing members 32 and 34 are rotated by being contacted to the thrust surfaces of the upper and lower bearings 20 and 22, thereby reducing a friction between the thrust supporting portion 41 of the rotation shaft 24 and the thrust bearing portion 38 of the upper and lower bearings.
Figure 11 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a third embodiment of the present invention, and Figure 12 is an engaged section view of the compression unit of the compressor having a Z-plate according to the third embodiment of the present invention. The compression unit of the compressor having the Z-plate according to the third embodiment of the present invention comprises: a cylinder 18 for forming the compression chambers 14 and 16; upper and lower bearings 20 and 22 for forming the compression chambers 14 and 16 with the cylinder 18; a rotation shaft 24 rotatably supported at the upper and lower bearings 20 and 22; a Z-plate 26 formed at an outer circumference surface of the rotation shaft 24 for dividing the compression chambers into the first compression chamber 14 and the second compression chamber 16; first and second vanes 28 and 30 for dividing the first and second compression chambers 14 and 16 into a suction region and a compression region; and friction reducing members 60 and 62 arranged at thrust surfaces between the rotation shaft 24 and the upper and lower bearings 20 and 22.
Constructions and operations of the compressor according to the third embodiment are equal to those aforementioned in said one embodiment except a structure of the friction reducing member.
The friction reducing members 60 and 62 are ball bearings inserted to the insertion grooves 64 and 66 formed at the thrust bearing portion 38 of the upper and lower bearings 20 and 22 and thus rolling contacted. The insertion grooves 64 and 66 are formed as a ring type having a predetermined depth to which the ball bearings 60 and 62 are inserted, depths of the insertion grooves 64 and 66 are almost equal to heights of the ball bearings, inner diameters of the insertion grooves 64 and 66 are smaller than those of the ball bearings 60 and 62 so that the ball bearings 60 and 62 can be inserted and be rotated, and outer diameters of the insertion grooves 64 and 66 are formed to be larger than those of the ball bearings 60 and 62.
The ball bearings 60 and 62 are respectively composed of a ball retainer 68 formed as a ring type having a predetermined width and a height, and a plurality of balls 70 rotatably arranged with a predetermined interval towards a circumference direction of the ball retainer 68.
Herein, the balls 70 of the ball bearings are rolling-contacted to the thrust bearing portion 38 of the upper and lower bearings 20 and 22, and rolling- contacted to the thrust supporting portion 41 of the rotation shaft, thereby reducing a friction between the upper and lower bearings 20 and 22 and the rotation shaft 24.
Also, by supplying oil to the insertion grooves 64 and 66 to which the ball bearings 60 and 62 are inserted, the ball bearings are lubricated, thereby reducing the friction greatly. Figure 13 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a fourth embodiment of the present invention, and Figure 14 is an engaged section view of the compression unit of the compressor having a Z-plate according to the fourth embodiment of the present invention. The compression unit according to the fourth embodiment is equal to that explained in the third embodiment except that the ball bearings 60 and 62 are sliding-inserted to the insertion grooves 76 and 78 formed at the upper and lower surfaces of the thrust supporting portion 42 of the rotation shaft 24. The insertion grooves 76 and 78 are formed as a ring shape having a predetermined width and a depth towards a circumference direction at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24.
In the compression unit of the fourth embodiment, the ball bearings 60 and 62 are rolling-contacted to the insertion grooves 76 and 78 formed at the thrust supporting portion 41 of the rotation shaft, and rolling-contacted to the thrust bearing portion 38 of the upper and lower bearings 20 and 22, thereby reducing a friction therebetween.
Figure 15 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a fifth embodiment of the present invention, and Figure 16 is an engaged section view of the compression unit of the compressor having a Z-plate according to the fifth embodiment of the present invention.
Constructions and operations of the compressor according to the fifth embodiment are equal to those aforementioned in said one embodiment except a structure of the friction reducing member.
That is, the friction reducing members 90 and 91 of the fifth embodiment respectively are composed of a first sliding plate 84 inserted to insertion grooves 80 and 82 formed at the thrust bearing portion 38 of the upper and lower bearings 20 and 22, a second sliding plate 86 contacted to the thrust supporting portion 41 of the rotation shaft, and a plurality of balls 88 rolling-contacted between the first sliding plate 84 and the second sliding plate 86.
The insertion grooves 80 and 82 are formed as a ring type having a predetermined width and a depth at the thrust bearing portion 38 of the upper and lower bearings 20 and 22.
The first and second sliding plates 84 and 86 are formed as a ring type having a predetermined width and a thickness, and sliding grooves 92 and 94 to which the balls 88 are inserted and are rolling-contacted are formed towards a circumference direction at the upper and lower surfaces of the first and second sliding plates.
In the compression unit according to the fifth embodiment, the first sliding plate 84 is inserted to the insertion grooves 80 and 82 formed at the thrust bearing portion 38 of the upper and lower bearings 20 and 22 and supported, the second sliding plate 86 is contacted to the thrust supporting portion 41 of the rotation shaft, and a plurality of balls 88 are rolling-contacted to the sliding grooves 92 and 94 formed between the first sliding plate 84 and the second sliding plate 86, thereby reducing a friction between the upper and lower bearings 20 and 22 and the rotation shaft 24.
Figure 17 is a disassembled perspective view of a compression unit of a compressor having a Z-plate according to a sixth embodiment of the present invention, and Figure 18 is an engaged section view of the compression unit of the compressor having a Z-plate according to the sixth embodiment of the present invention.
The compression unit according to the sixth embodiment is equal to that explained in the fifth embodiment except that the friction reducing members 90 and 91 are sliding-inserted to the insertion grooves 96 and 98 formed at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24.
The insertion grooves 96 and 98 are formed as a ring type having a predetermined width and a depth towards a circumference direction at the upper and lower surfaces of the thrust supporting portion 41 of the rotation shaft 24. In the compressor having the Z-plate according to the present invention, the friction reducing members is arranged between the thrust bearing portion of the upper and lower bearing portions and the thrust supporting portion of the rotation shaft to support the thrust load. According to this, the friction between the upper and lower bearings and the rotation shaft is reduced, thereby reducing abrasion between each component of the compressor and increasing a reliability of the compressor.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A compressor having a Z-plate comprising: a cylinder fixed in a casing for forming a compression chamber; upper and lower bearings hermetically mounted at upper and lower surfaces of the cylinder, respectively for forming the compression chamber with the cylinder; a rotation shaft connected to a driving unit and rotatably supported at the upper and lower bearings; a Z-plate engaged at an outer circumference surface of the rotation shaft for dividing the compression chamber into a first compression chamber and a second compression chamber; and friction reducing members arranged at thrust surfaces between the rotation shaft and the upper and lower bearings for reducing a friction therebetween.
2. The compressor of claim 1 , wherein the upper and lower bearings are respectively composed of a radial bearing portion for supporting the rotation shaft in a radius direction, and a thrust bearing portion for supporting the rotation shaft in a shaft direction, in which the thrust bearing portion is provided with insertion grooves for inserting the friction reducing members rotatively.
3. The compressor of claim 2, wherein the insertion grooves are formed as a ring type towards a circumference direction at centers of a lower surface of the upper bearing and an upper surface of the lower bearing.
4. The compressor of claim 2, wherein depths of the insertion grooves are horizontal with the lower surface of the upper bearing and the upper surface of the lower bearing when the friction reducing members are inserted thereto, and. inner diameters of the insertion grooves are formed to be larger than outer diameters of the friction reducing members so that the friction reducing members can be rotated.
5. The compressor of claim 1 , wherein the friction reducing members are inserted to the insertion grooves formed at the upper and lower bearings with a disc shape of which center portion is opened.
6. The compressor of claim 5, wherein an oil groove for lubrication is formed either at the upper surface or at the lower surface of the friction reducing members.
7. The compressor of claim 5, wherein minute poly-holes 48 in which oil is filled can be formed either at the upper surface or at the lower surface of the friction reducing members.
8. The compressor of claim 1 , wherein the friction reducing members are constructed as ball bearings.
9. The compressor of claim 8, wherein the ball bearings are rolling- contacted to the insertion grooves formed at the thrust bearing portion of the upper and lower bearings, and rolling-contacted to the thrust supporting portion of the rotation shaft.
10. The compressor of claim 9, wherein a depth of the insertion groove is almost equal to a height of the ball bearing, an inner diameter of the insertion groove is smaller than that of the ball bearing so that the ball bearing can be inserted and be rotated, and an outer diameter of the insertion groove is formed to be larger than that of the ball bearing.
11. The compressor of claim 8, wherein the ball bearing is composed of a ball retainer formed as a disc type of which center portion is opened, and a plurality of balls rotatably arranged with a predetermined interval towards a circumference direction of the ball retainer.
12. The compressor of claim 11 , wherein the balls of the ball bearing are rolling-contacted to the thrust bearing portion of the upper and lower bearings and rolling-contacted to the thrust supporting portion of the rotation shaft.
13. The compressor of claim 1 , wherein the friction reducing member comprises: a first sliding plate inserted to the insertion groove formed at the thrust bearing portion of the upper and lower bearings; a second sliding plate contacted to the thrust supporting portion of the rotation shaft; and a plurality of balls rolling-contacted between the first sliding plate and the second sliding plate.
14. The compressor of claim 13, wherein the first and second sliding plates are formed as a ring type having a predetermined width and a thickness and inserted to the insertion grooves formed at the thrust bearing portion of the upper and lower bearings, and sliding grooves to which the balls are inserted and rolling-contacted are formed towards a circumference direction at the upper and lower surfaces of the first and second sliding plates.
15. The compressor of claim 13, wherein a depth of the insertion groove is almost equal to a height of the friction reducing member, an inner diameter of the insertion groove is smaller than that of the friction reducing member so that the friction reducing member can be inserted and be rotated, and an outer diameter of the insertion groove is formed to be larger than that of the friction reducing member.
16. A compressor having a Z-plate comprising: a cylinder fixed in a casing for forming a compression chamber; upper and lower bearings hermetically mounted at upper and lower surfaces of the cylinder, respectively for forming the compression chamber with the cylinder; a rotation shaft connected to a driving unit and rotatably supported at the upper and lower bearings; a Z-plate engaged at an outer circumference surface of the rotation shaft for dividing the compression chamber into a first compression chamber and a second compression chamber; and friction reducing members rotatably inserted to insertion grooves respectively formed at upper and lower surfaces of a thrust supporting portion of the rotation shaft and sliding-contacted to thrust surfaces of the upper and lower bearings, thereby reducing a friction between the thrust surfaces of the rotation shaft and the upper and lower bearings.
17. The compressor of claim 16, wherein the insertion grooves are formed as a ring type at the upper and lower surfaces of the thrust supporting portion of the rotation shaft towards a circumference direction.
18. The compressor of claim 16, wherein the friction reducing members are inserted to the insertion grooves formed at the thrust supporting portion of the rotation shaft and have a disc shape of which center portion is opened.
19. The compressor of claim 18, wherein an oil groove for lubrication is formed either at the upper surface or at the lower surface of the friction reducing member.
20. The compressor of claim 18, wherein minute poly-holes in which oil
for lubrication is filled are formed either at the upper surfaces or at the lower surfaces of the friction reducing members.
21. The compressor of claim 16, wherein the friction reducing members are rolling-contactedly inserted to the insertion grooves formed at the thrust supporting of the rotation shaft, and are ball bearings rolling-contacted to the thrust supporting portion of the rotation shaft.
22. The compressor of claim 21 , wherein a depth of the insertion groove is almost equal to a height of the ball bearing, an inner diameter of the insertion groove is smaller than that of the ball bearing so that the ball bearing can be inserted and be rotated, and an outer diameter of the insertion groove is formed to be larger than that of the ball bearing.
23. The compressor of claim 21 , wherein the ball bearing is composed of a ball retainer formed as a disc type of which center portion is opened, and a plurality of balls rotatably arranged with a predetermined interval towards a circumference direction of the ball retainer.
24. The compressor of claim 16, wherein the friction reducing member comprises: a first sliding plate inserted to the insertion groove formed at the thrust supporting portion of the rotation shaft; a second sliding plate arranged with a predetermined interval with the first sliding plate; and a plurality of balls rolling-contacted between the first sliding plate and the second sliding plate.
25. The compressor of claim 24, wherein the first and second sliding plates are formed as a ring type having a predetermined width and a thickness and sliding grooves to which the balls are inserted and rolling-contacted are formed towards a circumference direction at the upper and lower surfaces of the first and second sliding plates.
PCT/KR2003/001484 2002-10-31 2003-07-24 Hermetic compressor having a z-plate WO2004040141A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003301697A AU2003301697A1 (en) 2002-10-31 2003-07-24 Hermetic compressor having a z-plate

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR10-2002-0067229 2002-10-31
KR1020020067229A KR20040038332A (en) 2002-10-31 2002-10-31 Apparatus for reducing thrust face friction of enclossed compressor
KR1020020068536A KR20040040189A (en) 2002-11-06 2002-11-06 Apparatus for reducing thrust face friction of enclossed compressor
KR10-2002-0068537 2002-11-06
KR10-2002-0068536 2002-11-06
KR1020020068537A KR20040040190A (en) 2002-11-06 2002-11-06 Apparatus for reducing thrust face friction of enclossed compressor

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN103452845A (en) * 2013-08-22 2013-12-18 广东美芝制冷设备有限公司 Rotary compressor
WO2017201895A1 (en) * 2016-05-25 2017-11-30 姚镇 Rotating system, and fluid motor, compressor, pump and engine using same
CN107514365A (en) * 2017-09-29 2017-12-26 珠海格力节能环保制冷技术研究中心有限公司 Pump assembly and there is its compressor
CN108026922A (en) * 2015-10-02 2018-05-11 沃森马洛股份有限公司 Pump and retention device

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DE3410059A1 (en) * 1984-03-19 1985-09-19 Werner 6336 Solms Mell Compressor
US20020021976A1 (en) * 2000-07-05 2002-02-21 Riegger Otto K. Rotating machine having lubricant-containing recesses on a bearing surface
JP2002195180A (en) * 2000-12-27 2002-07-10 Fujitsu General Ltd Rotary compressor

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US4093408A (en) * 1976-12-03 1978-06-06 Yoshichika Yamaguchi Positive cam type compressor
DE3410059A1 (en) * 1984-03-19 1985-09-19 Werner 6336 Solms Mell Compressor
US20020021976A1 (en) * 2000-07-05 2002-02-21 Riegger Otto K. Rotating machine having lubricant-containing recesses on a bearing surface
JP2002195180A (en) * 2000-12-27 2002-07-10 Fujitsu General Ltd Rotary compressor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103452845A (en) * 2013-08-22 2013-12-18 广东美芝制冷设备有限公司 Rotary compressor
CN108026922A (en) * 2015-10-02 2018-05-11 沃森马洛股份有限公司 Pump and retention device
WO2017201895A1 (en) * 2016-05-25 2017-11-30 姚镇 Rotating system, and fluid motor, compressor, pump and engine using same
CN107514365A (en) * 2017-09-29 2017-12-26 珠海格力节能环保制冷技术研究中心有限公司 Pump assembly and there is its compressor
CN107514365B (en) * 2017-09-29 2024-02-27 珠海格力节能环保制冷技术研究中心有限公司 Pump body assembly and compressor with same

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