JP2000145668A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve volumetric efficiency by utilizing high pressure gas of a discharge chamber to press a revolving scroll against a stationary scroll to reduce a gap in between, and to improve reliability by smoothly revolving the revolving scroll. SOLUTION: A space between a thrust bearing 11 and a thrust receiving surface 5d of an end plate 5a of a revolving scroll 5 corresponding to the thrust bearing 11 is slightly separated. A cylindrical thrust ring 12 movable in an axial direction, and a communication hole (a) communicating a stationary scroll 4 with a main frame 8 and connecting one end surface of the thrust ring 12 located on a side of the main frame 8 with a discharge chamber 16 are provided in the separated space. The revolving scroll 5 is pressed against the stationary scroll 4 via the thrust ring 12 by high pressure gas of the discharge chamber 16 led through the communication hole (a).

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 scroll compressor, in which a high-pressure gas in a discharge chamber is used to press a orbiting scroll against a fixed scroll to reduce a gap between the scrolls. And a structure that enables the orbiting scroll to be smoothly turned to improve reliability.

[0002]

2. Description of the Related Art A conventional scroll compressor is, for example, shown in FIG.
As shown in FIG. 4, a fixed scroll in which an electric motor 2, a discharge chamber 16, and a compression section 3 are arranged in a closed container 1, and the compression section 3 is provided with a spiral wrap 4 b standing on the inner surface of a head plate 4 a. 4
Similarly, a spiral wrap 5b is erected on one surface of the end plate 5a, and the orbiting scroll 5 provided with a scroll shaft 5c on the other surface is eccentrically engaged with each other, thereby interposing between the two wraps 4b and 5b. A compression chamber 6 is formed, a discharge hole 4c connecting the compression chamber 6 and the discharge chamber 16 is formed, and the orbiting scroll 5 is revolved orbiting while preventing its rotation, and is formed on the main frame 8. The orbiting scroll 5 is driven by the electric motor 2 so as to be slidably supported by the thrust bearing 11 ′, and has an eccentric bearing 9 linked to the scroll shaft 5 c on the inner side. And a shaft 7 formed by continuously forming a crankshaft 7a.

A recess 9a is provided outside the crankshaft 7a, an Oldham ring 10 'is provided, and a thrust bearing 11' is formed on a main frame 8 which supports the crankshaft 7a.
The orbiting scroll 5 is supported by the thrust bearing 11 '. An annular oil groove is provided on the thrust receiving surface 5d 'of the end plate 5a of the orbiting scroll 5 facing the thrust bearing 11'.
14 'as well as an oil groove 14a' communicating the recess 9a with the annular oil groove 14 '.

In the above configuration, lubricating oil in an oil reservoir (not shown) is supplied from a pump (not shown) to the eccentric bearing 9 through an oil feed hole 13 ', flows into the concave portion 9a, and is formed into an annular shape on the thrust receiving surface 5d'. The oil is supplied to the oil groove 14 '. The lubricating oil flowing out of the thrust receiving surface 5d '
10 ′, and reaches the compression chamber 6 via the orbiting scroll 5 to refuel the wrap 5b and is ejected from the discharge hole 4c to the discharge chamber 16 via a return hole. To return to. Further, an annular groove 15a is provided in the main frame 8, and a sealing member 15b is provided in the groove 15a. The inside of the sealing member 15b is set to a high pressure, and the outside is set to a low pressure to turn the orbiting scroll 5 into the fixed scroll. 4 and these orbiting scrolls 5
And the space between the fixed scrolls 4 is reduced to improve the volumetric efficiency.

However, there is a problem that the above-described partition between the high-pressure side and the low-pressure side becomes impossible due to wear or damage of the sealing material 15b.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, in the present invention, the orbiting scroll is pressed against the fixed scroll by utilizing the high-pressure gas in the discharge chamber, and the gap between them is reduced to improve the volumetric efficiency. It is another object of the present invention to provide a scroll compressor capable of improving the reliability by smoothly orbiting the orbiting scroll.

[0007]

According to the present invention, in order to solve the above-mentioned problems, an electric motor, a discharge chamber and a compression section are arranged in a closed container, and the compression section is provided with a spiral wrap on the inner surface of a head plate. The fixed scroll and the orbiting scroll are meshed with each other to form a compression chamber, and a discharge hole connecting the compression chamber and the discharge chamber is formed. And a scroll compressor slidably supported by a thrust bearing formed on a main frame and provided with a shaft for driving the orbiting scroll by the electric motor, wherein the thrust bearing corresponds to the thrust bearing. The orbiting scroll is slightly separated from the thrust receiving surface of the end plate, and a cylindrical thrust ring that is movable in the axial direction is provided at the separated portion. Communicating the fixed scroll and the main frame, the communication hole connecting the one end face of the thrust ring located on the main frame side and the discharge chamber is provided by high pressure gas in the discharge chamber led from the communication hole,
The orbiting scroll is pressed against the fixed scroll via the thrust ring.

Further, the main frame is provided with an annular groove for receiving one end of the thrust ring, and one end of the communication hole is connected to the bottom of the groove.

Further, the groove is formed continuously with the shaft and is formed continuously with the outer peripheral surface of a crankshaft linked to a scroll shaft of the orbiting scroll.

In addition, while making the bottom surface of the groove slightly deeper, the connecting portion at one end of the communication hole connected to the portion is moved accordingly, and the one end surface of the thrust ring is provided on the bottom surface of the groove. Opposing projections are formed continuously, and the tips of the projections are in contact with the bottom surface.

[0011] Further, a plurality of the communication holes are provided.

[0012] Further, a plurality of the protrusions are provided.

Further, the thrust ring is formed of a material such as iron, resin, or carbon.

Further, a cushioning member made of an elastic material is interposed between the other end surface of the thrust ring and the orbiting scroll opposed thereto.

Further, the cushioning member is attached to the other end surface of the thrust ring or the orbiting scroll.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below as examples based on the attached drawings. FIG. 1 and FIG.
As shown in FIGS. 2 (A) to 2 (C), the electric motor 2 is placed in the closed container 1 in substantially the same manner as in the above-described prior art.
, The discharge chamber 16 and the compression unit 3 are arranged, and the compression unit 3 is
The fixed scroll 4 having a spiral wrap 4b erected on the inner surface thereof and the orbiting scroll 5 having the spiral wrap 5b erected on one surface of the end plate 5a and having a scroll shaft 5c provided on the other surface are eccentric. The compression chamber 6 is formed between the two wraps 4b and 5b by eccentrically meshing with each other as shown by the amount σs, and a discharge hole 4c connecting the compression chamber 6 and the discharge chamber 16 is formed. The orbiting scroll 5 is revolved orbiting while preventing its rotation, and is slidably supported by a thrust ring described later interposed between the main frame 8 and the orbiting scroll 5 by the electric motor 2. For driving, a shaft 7 having an eccentric bearing 9 connected to the scroll shaft 5c on the inner side and continuously forming a crankshaft 7a supported by the main frame 8 is provided. Recess 9a outside rank axis 7a
The Oldham ring 10 is provided with the thrust bearing
An annular oil groove 14 'is provided on the thrust receiving surface 5d of the end plate 5a of the orbiting scroll 5 opposed to 11, and an oil groove 14a' communicating the concave portion 9a and the annular oil groove 14 'is provided. Lubricating oil in an oil reservoir (not shown) is supplied from a pump (not shown) to the eccentric bearing 9 through an oil feed hole 13,
The lubricating oil flowing into 9a and supplied to the annular oil groove 14 'of the thrust receiving surface 5d and flowing out from the thrust receiving surface 5d is supplied to the Oldham ring 10 and is compressed through the orbiting scroll 5. After reaching the chamber 6, oil is supplied to the wrap 5b, is ejected from the discharge hole 4c to the discharge chamber 16, and returns to an oil reservoir (not shown) via a return hole.

The thrust bearing 11 and the thrust bearing 11
While a small distance is allowed between the end plate 5a of the orbiting scroll 5 and the thrust receiving surface 5d of the orbiting scroll 5 corresponding to the above, a cylindrical thrust ring 12 which is movable in the axial direction is provided at the separated portion,
A communication hole a communicating the fixed scroll 4 and the main frame 8 and connecting one end surface of the thrust ring 12 located on the main frame 8 side with the discharge chamber 16 is provided, and the communication hole a is guided from the communication hole a. The orbiting scroll 5 is pressed against the fixed scroll 4 via the thrust ring 12 by the high-pressure gas in the discharge chamber 16. The gas is pressed against the fixed scroll 4 to reduce the gap therebetween to improve the volumetric efficiency, and the orbiting scroll 5 can be smoothly turned to improve the reliability. As in the prior art described above, the above-described partition between the high-pressure side and the low-pressure side becomes impossible due to wear or damage of the sealing material 15b. It becomes a structure so that there is no arises that Tsu.

The main frame 8 is provided with an annular groove 11a for receiving one end of the thrust ring 12,
One end of the communication hole a is connected to the bottom of the concave groove 11a, so that the thrust ring 12 is provided between the orbiting scroll 5 and the main frame 8.
Can be easily and accurately interposed,
Connect one end of the communication hole a to one end face of the thrust ring 12.
12a can be connected to a position where it can be pressed accurately.

The concave groove 11a is formed continuously with the shaft 7, and the orbiting scroll 5 has a scroll shaft 5c.
The lubricating oil flows into the recess 9a and is supplied to the annular oil groove 14 'of the thrust receiving surface 5d. Is also effectively supplied between the crankshaft 7a and the thrust ring 12.

In addition, while making the bottom surface of the groove 11a slightly deeper, the connecting portion at one end of the communication hole a connected to the position is moved while the concave portion is formed on one end surface 12a of the thrust ring 12. A convex portion 12c or 12d facing the bottom surface of the groove 11a is continuously formed, and the tip of the convex portion 12c or 12d is in contact with the bottom surface of the concave groove 11a. The area of one end face 12a of the thrust ring 12 pressed by the high-pressure gas can be appropriately reduced, and the high-pressure gas of the discharge chamber 16 presses the other end face 12b against the thrust receiving face 5d of the orbiting scroll 5. The structure is such that the pressing force by the pressure can be optimized.

Further, by providing a plurality of the communication holes a, the one end face 12a of the thrust ring 12 can be pressed in a well-balanced manner, and the strength of the pressing force can be easily optimized. .

Further, by providing a plurality of the protruding portions 12c or 12d, the thrust ring 12 can be brought into contact with the bottom surface of the groove 11a in a well-balanced and accurate manner.

The thrust ring 12 is made of a material such as iron, resin, or carbon.
The thrust ring 12 can be given appropriate strength so that it can be manufactured in a cost-effective manner.

The other end surface 12b of the thrust ring 12
And the orbiting scroll 5 opposing the orbiting scroll 5, the orbiting scroll 5 is pressed against the fixed scroll 6 in a well-balanced manner via the cushioning member 14 by interposing the cushioning member 14 made of an elastic body. It has a configuration that enables it.

Further, by attaching the cushioning member 14 to the other end surface 12b of the thrust ring 12 or the orbiting scroll 5, the cushioning member 14 is displaced or the other end surface 12b of the thrust ring 12 or The orbiting scroll 5 is configured not to be separated from the orbiting scroll 5.

Further, the gap between the fixed scroll 4 and the orbiting scroll 5 in the axial direction is defined by the communication hole a.
And the cross-sectional area thereof, and the size of the area of the one end face 12a of the thrust ring 12, so that the high-pressure gas in the discharge chamber 16 passes through the thrust ring 12 through the thrust ring 12. Thereby, the pressing force for pressing the orbiting scroll 5 against the fixed scroll 4 can be optimized.

With the above configuration, as shown in FIG. 1, FIG. 2 (A) and FIG.
And the orbiting scroll 5 corresponding to the thrust bearing 11
A small distance between the end plate 5a and the thrust receiving surface 5d of the end plate 5a, while providing the axially movable cylindrical thrust ring 12 at the separated portion, and communicating the fixed scroll 4 and the main frame 8 with each other. , The same mainframe 8
A communication hole a connecting one end surface of the thrust ring 12 located on the side with the discharge chamber 16 is provided, and the swirling is performed through the thrust ring 12 by the high-pressure gas in the discharge chamber 16 guided from the communication hole a. Since the scroll 5 is configured to be pressed against the fixed scroll 4, the orbiting scroll 5
Is pressed against the fixed scroll 4 using the high-pressure gas in the discharge chamber 16 to reduce the gap between them, thereby improving the volumetric efficiency and smoothly rotating the orbiting scroll 5 to improve the reliability. As described above, the sealing member 15b may be worn out as in the prior art described above,
Alternatively, the scroll compressor is configured such that the partition between the high-pressure side and the low-pressure side described above does not become impossible due to damage.

[0028]

As described above, according to the present invention, the orbiting scroll is pressed against the fixed scroll by using the high-pressure gas in the discharge chamber, thereby reducing the gap between them and improving the volumetric efficiency. Is smoothly turned to improve the reliability.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a thrust ring used in a scroll compressor according to the present invention, wherein (A) shows an example in which convex portions are not formed continuously, and (B) and (C) show a plurality of convex portions formed continuously. Here is an example.

FIG. 3 is a sectional view of a conventional scroll compressor.

FIG. 4 is a view showing a groove shape of an oil groove 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 Lap 4c Discharge port 5 Orbiting scroll 5a End plate 5b Lap 5c Scroll shaft 5d Thrust receiving surface 6 Compression chamber 7 Shaft 7a Crank shaft 8 Main frame 9 Eccentric bearing 9a Concave portion 10 Annular recess 11 Thrust bearing 11a Groove groove 12 Thrust ring 12a One end face of thrust ring 12b Other end face of thrust ring 12c, 12d Convex part 13 Oil feed hole 14 Buffer member 16 Discharge chamber

Claims (9)

[Claims] An electric motor, a discharge chamber, and a compression section are arranged in a closed vessel, and the compression section is compressed by engaging a fixed scroll and an orbiting scroll in which a spiral wrap is provided upright on an inner surface of a head plate. A discharge hole is formed between the compression chamber and the discharge chamber, and the orbiting scroll is revolved orbiting while preventing its rotation, and is slidable on a thrust bearing formed on the main frame. Support,
In a scroll compressor including a shaft that drives the orbiting scroll by the electric motor, the thrust bearing and a thrust receiving surface of a head plate of the orbiting scroll corresponding to the thrust bearing are slightly separated from each other, while being separated from each other. A cylindrical thrust ring movably in the axial direction in the portion, a communication hole communicating the fixed scroll and the main frame, and connecting one end face of the thrust ring located on the main frame side to the discharge chamber. Wherein the orbiting scroll is pressed against the fixed scroll via the thrust ring by high-pressure gas in the discharge chamber guided from the communication hole. 2. The main frame according to claim 1, wherein an annular groove for receiving one end of the thrust ring is provided in the main frame, and one end of the communication hole is connected to a bottom of the groove. Scroll compressor. 3. The method according to claim 1, wherein the groove is formed continuously with the shaft, and is formed continuously with an outer peripheral surface of a crankshaft linked to a scroll shaft of the orbiting scroll. The scroll compressor as described. 4. A bottom surface of the groove is made slightly deeper, and a connection portion at one end of the communication hole connected to the location is moved accordingly, while a bottom surface of the groove is formed on one end surface of the thrust ring. 4. The scroll compressor according to claim 1, wherein opposing convex portions are continuously formed, and a tip of the convex portion is in contact with the bottom surface. 5. 5. The scroll compressor according to claim 1, wherein a plurality of said communication holes are provided. 6. The scroll compressor according to claim 4, wherein a plurality of the protrusions are provided. 7. The scroll compressor according to claim 1, wherein the thrust ring is formed of a material such as iron, resin, or carbon. 8. A cushioning member made of an elastic material is interposed between the other end surface of the thrust ring and the orbiting scroll opposed thereto. 8. The scroll compressor according to 7. 9. The scroll compressor according to claim 8, wherein the cushioning member is attached to the other end surface of the thrust ring or the orbiting scroll.