JP2002005050A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of slowing down a sliding speed at bearings of a main shaft side and a revolving scroll side, reducing a bearing abrasion and preventing an seizure by connecting the main shaft to the revolving scroll with an eccentric pin. SOLUTION: The scroll compressor is composed of a fixed scroll 4 forming a compression chamber, a revolving scroll 5, a shaft 9 transmitting a rotational force of an electric motor 2 and driving a revolving scroll 5, a main frame 8 having a main bearing 8a supporting the main shaft 9a formed at a top of the shaft 9, an eccentric bearing 9b formed in the main shaft 9a, and boss 5d equipped with the revolving bearing 5c at a back of an end cover 5c of the revolving scroll 5, the eccentric pin 10 which center is offset by the specified distance to the axis of the main shaft 9a is engaged with play between the eccentric bearing 9b and the revolving bearing 5c, the main shaft 9a and the revolving scroll 5 are connected and the revolving scroll 5 is made to revolve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a structure of an eccentric pin connecting a main shaft for driving an orbiting scroll and an orbiting scroll.

[0002]

2. Description of the Related Art Conventional scroll compressors include, for example, those shown in FIG. In the figure, a fixed scroll 4 in which a motor 2 and a compression unit 3 are disposed on the left and right sides in a horizontal closed container 1, and the compression unit 3 is provided with a spiral wrap 4 b standing on the inner surface of a head plate 4 a, Similarly, an orbiting scroll 5 having a spiral wrap 5b erected on the inner surface of an end plate 5a is meshed with each other to form a compression chamber 6, and an Oldham ring 7 for revolving orbiting while preventing the orbiting scroll 5 from rotating. A shaft 9 ′ having a turning shaft 9 a ′ for transmitting the rotating force of the electric motor 2 to drive the turning scroll 5, and a main frame 8 ′ having a bearing 8 a ′ for supporting one end of the shaft 9 ′;
A scroll type compressor is constituted by a boss 5d 'provided with a revolving bearing 5c' on the back surface of the end plate 5a of the revolving scroll 5.

The turning shaft 9a 'is formed integrally with the tip of the shaft 9', and is fitted into a turning bearing 5c 'of the boss 5d'. In the above configuration, when the shaft 9 'is rotated by the electric motor 2, this rotational force is transmitted from the orbiting shaft 9a' to the orbiting scroll 5 via the orbiting bearing 5c 'and the boss 5d'. In this case, the slewing shaft 9a 'and the slewing bearing 5c'
Slides at a speed (sliding speed) obtained by multiplying the outer peripheral length of the turning shaft 9a 'by the number of revolutions of the turning shaft 9a'.

However, in a compressor in which the number of revolutions of the electric motor 2 is variable by an inverter or the like, when the number of revolutions of the shaft increases, the sliding speed increases, and the wear of the sliding portion is accelerated or seized. Might be.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. By connecting the main shaft and the orbiting scroll with cylindrical eccentric pins, sliding of the bearings on the main shaft and the orbiting scroll is performed. Dynamic speed can be reduced,
It is an object of the present invention to provide a scroll compressor capable of reducing abrasion of a sliding portion and preventing seizure.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a motor and a compressor arranged in a closed vessel, and the compressor is provided with a fixed scroll having a spiral wrap on a head plate. An orbiting scroll that engages the fixed scroll and the wrap with each other to form a plurality of compression chambers; a shaft that transmits the rotational force of the electric motor to drive the orbiting scroll; and an eccentric bearing portion formed at the tip of the shaft. A main frame having a main bearing for supporting a main shaft provided with a boss portion provided with a turning bearing portion on the back surface of the end plate of the orbiting scroll, and an eccentric bearing portion of the main shaft and a turning bearing portion of the boss portion. An eccentric pin whose center is decentered by a predetermined distance with respect to the axis of the main shaft is loosely fitted between the main shaft and the main shaft and the orbiting scroll, and the orbiting scroll revolves. It has a structure in which to exercise.

Further, the eccentric pin is made of a material having a hardness different from that of the main shaft.

Further, the eccentric pin is made of a material having a different hardness from that of the orbiting scroll.

The eccentric pin is formed in a hollow cylindrical shape.

Further, a sliding member is provided on the eccentric bearing portion of the main shaft and the turning bearing portion of the boss portion.

Further, the sliding member is made of a resin material of PET, PPS, PEEK or PTFE which is strong in heat resistance and slidability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a scroll compressor according to the present invention will be described below with reference to FIGS.
A description will be given based on (A) and (B). In the figure, a fixed scroll 4 in which a motor 2 and a compression unit 3 are disposed on the left and right sides in a horizontal closed container 1, and the compression unit 3 is provided with a spiral wrap 4 b standing on the inner surface of a head plate 4 a, Similarly, an orbiting scroll 5 having a spiral wrap 5b erected on the inner surface of an end plate 5a is meshed with each other to form a compression chamber 6, and an Oldham ring 7 for revolving orbiting while preventing the orbiting scroll 5 from rotating. A shaft 9 for transmitting the rotational force of the electric motor 2 to drive the orbiting scroll 5; a main frame 8 having a main bearing 8a for supporting a main shaft 9a formed at the tip of the shaft 9; A scroll-type compressor is constituted by a boss 5d provided with a swivel bearing 5c on the back surface of the head plate 5a.

An eccentric bearing 9b is formed on the main shaft 9a, and the center of the eccentric bearing 9b of the main shaft 9a and the pivot bearing 5c of the boss 5d with respect to the axis a of the main shaft 9a. b is configured such that the eccentric pin 10 eccentric by a predetermined distance e is loosely fitted, the main shaft 9a and the orbiting scroll 5 are connected, and the orbiting scroll 5 is revolved orbiting.

The eccentric pin 10 is formed in a hollow cylindrical shape. When the material of the eccentric pin 10 is, for example, aluminum or an aluminum alloy, the material of the main shaft 9a is changed to an iron-based material having a hardness different from that of the main shaft 9a. To reduce sliding loss due to sliding friction. Further, the material of the eccentric pin 10 has a configuration different in hardness from the material of the orbiting scroll 5 in the same manner as described above, so that the sliding loss is reduced.

The eccentric bearing 9b of the main shaft 9a and the slewing bearing 5c of the boss 5d are provided with PET (polyethylene), PPS (polyphenylene sulfide), PEEK having a heat resistant temperature of 200 ° C. or higher and strong sliding properties. (Polyetheretherketone) or PTFE (Teflon (registered trademark)) or another resin material is used to provide sliding members 11a and 11b.

In the above configuration, when the electric motor 2 is driven, the shaft 9 rotates, and the main shaft 9a rotates about the axis a. At the same time, the rotational force of the main shaft 9a is
The orbiting scroll 5 is revolved on a circular orbit having a revolving radius r while the Oldham ring 7 prevents rotation. The eccentric pin 10 includes an eccentric bearing 9b of the main shaft 9a and a turning bearing of a boss 5d provided on the orbiting scroll 5.
Since sliding is performed in both 5c, the sliding speed at each sliding portion can be dispersed and reduced.

As described above, the boss 5d having the orbital bearing 5c is formed on the back surface of the end plate 5a of the orbiting scroll 5, and the eccentric bearing 9b is formed on the main shaft 9a. Between the boss 5d and the axis a of the main shaft 9a.
An eccentric pin 10 whose center b is eccentric by a predetermined distance e is loosely fitted to the main shaft 9a and the orbiting scroll 5 so that the eccentric bearing portion on the main shaft 9a side is formed.
The scroll compressor can reduce the sliding speed of the orbiting scroll portion 9b and the orbiting bearing portion 5c on the orbiting scroll 5 side, reduce wear on each sliding portion, and prevent seizure.

[0018]

As described above, according to the present invention, a boss having a orbiting bearing is formed on the back surface of the end plate of the orbiting scroll, and an eccentric bearing is formed on the main shaft. An eccentric pin whose center is eccentric with respect to the axis of the main shaft is loosely fitted, and the main shaft and the orbiting scroll are connected. Can reduce the sliding speed of
The scroll compressor is capable of reducing wear on each sliding portion and preventing seizure.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a scroll compressor according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the scroll compressor according to the present invention.

FIG. 3 is an enlarged view of a main part showing one embodiment of the present invention, and FIG.
Is a cross-sectional view, and (B) is a view taken along the arrow aa in (A).

FIG. 4 is a side sectional view of a scroll compressor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 3 Compression part 4 Fixed scroll 4a End plate 4b Wrap 5 Orbiting scroll 5a End plate 5b Wrap 5c Orbit bearing part 5d Boss part 6 Compression chamber 7 Oldham ring 8 Main frame 8a Main bearing 9 Shaft 9a Main shaft 9b Eccentric bearing part Eccentric pin 11a, b Sliding member

Claims (6)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container,
A fixed scroll having a spiral wrap on the end plate for the compression portion; a orbiting scroll for engaging the fixed scroll and the wrap with each other to form a plurality of compression chambers; and transmitting the rotational force of the electric motor to drive the orbiting scroll. Shaft, a main frame having a main bearing formed at the tip of the shaft and supporting a main shaft having an eccentric bearing portion, and a boss portion having a turning bearing portion on the back surface of the end plate of the orbiting scroll, Between the eccentric bearing portion of the main shaft and the orbiting bearing portion of the boss portion, an eccentric pin whose center is decentered by a predetermined distance with respect to the axis of the main shaft is loosely fitted, and the main shaft and the orbiting scroll are moved. A scroll compressor, wherein the scroll compressor is connected to perform a revolving orbiting motion of the orbiting scroll. 2. The scroll compressor according to claim 1, wherein said eccentric pin is made of a material having a hardness different from that of said main shaft. 3. The scroll compressor according to claim 1, wherein said eccentric pin is made of a material having a hardness different from that of said orbiting scroll. 4. The scroll compressor according to claim 1, wherein said eccentric pin is formed in a hollow cylindrical shape. 5. The scroll compressor according to claim 1, wherein a sliding member is provided on an eccentric bearing portion of said main shaft and a turning bearing portion of said boss portion. 6. The scroll compressor according to claim 5, wherein said sliding member is made of a resin material such as PET, PPS, PEEK or PTFE, which has high heat resistance and slidability.