JPH0681882B2 - Scroll fluid machinery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll type fluid machine used for a compressor for a refrigerator, an expander, a vacuum pump and the like.

2. Description of the Related Art The idea of using a sealing band as a means for sealing a leakage gap in the axial direction of a work space having a scroll type mechanism in which spiral blades are combined is found in US Pat. No. 801,182.

FIG. 5 is a cross-sectional view of a mechanical portion of a general scroll compressor of the related art. FIGS. 6 and 7 show the details of the spiral blade portion, and FIG. 8 shows the shape of the sealing band.

A scroll-type mechanism unit 2 and an electric motor 3 including a stator 4 and a rotor 5 are arranged inside the sealed container 1, and the rotor 5 is connected to a crankshaft 6 of the mechanism unit 2.

The mechanism unit 2 includes a fixed spiral blade component 8 having a fixed spiral blade 7, a swirl spiral blade component 11 having swirl spiral blades 10 meshing with the fixed spiral blade 7 to form a plurality of working spaces 9, and a crankshaft. 6 and a thrust bearing 13 for supporting the force by which the swirling spiral blade component 11 is pressed against the opposite side of the work space 9 by the pressure of the work space 9.
And the outer circumference of the thrust bearing 13, and
It is composed of a rotation restraint part 15 having a structure in which keys are provided on both surfaces of a circular annular body for restraining the rotation of the.

A sealing ring 14 is arranged on the outer periphery of the fixed spiral blade component 8 to partition the closed container 1 into a discharge port 16 and a suction side space 17.

The suction refrigerant sucked from the suction pipe 18 of the compressor enters the suction port 19 of the mechanism portion 2 via the suction side space 17. Mechanism part 2
The entered refrigerant gas is compressed into high temperature and high pressure through the suction chamber 20, the working space 9, and the discharge port 21, and is discharged from the discharge port 16 to the outside of the compressor through the discharge pipe 22.

A lubricating oil sump 23 is provided at the bottom of the closed vessel 1, and the lubricating oil therein passes through an oil supply hole 25 provided in the crankshaft 6 by an oil pump 24 to lubricate and cool each part of the mechanism part 2.

A sealing band groove 26 and a sealing band 27 are provided at the respective tips of the fixed spiral blade 7 and the swirling spiral blade 10, and a minute gap is provided between the bottom surface 28 of the sealing band groove 26 and the back surface 29 of the sealing band 27. The gap is configured.

By the swirling of the swirling spiral vane component, the working space 9 is gradually reduced in volume from the outer periphery and communicates with the central discharge port 21 while increasing the pressure.

Problems to be Solved by the Invention As described above, in the scroll-type fluid machine having the conventional sealing band 27, the high pressure side on the center side to the low pressure side on the outer peripheral side are passed through the gap on the back surface 29 of the sealing band 27. Leakage of gas toward the is a major factor that reduces the efficiency of this fluid machine, but if the gap on the back surface 29 of this sealing band 27 is too small, the related parts due to heat or pressure may be generated depending on the operating condition. The clearance may disappear due to the distortion of, and the sealing band 27 may be abnormally strongly pressed in the direction of the axis of the crankshaft 6, resulting in damage or wear of the fluid machine or a decrease in efficiency. Further, in order to produce the sealing band 27 with the back surface clearance kept in an appropriate range, the dimensional accuracy of the parts related to the clearance dimension must be extremely high. Further, when the related parts are worn by the operation, the clearance of the back surface of the sealing band is changed, which may further shorten the life of the fluid machine or significantly reduce the efficiency.

Means for Solving the Problems A first means for solving these problems according to the present invention is, in a scroll type fluid machine, a fixed spiral vane component having fixed spiral vanes and a mesh with the fixed spiral vanes. A swirling spiral blade part having swirling spiral blades forming a plurality of working spaces, a crankshaft for swivel-driving the swirling spiral blade part, a bearing part for supporting the main shaft of the crankshaft, and a rotation of the swirl blade part. And a rotation restraint part that prevents only the swirl from occurring and a sealing band groove is provided at the tip end portion of the fixed spiral blade and the swirl spiral blade, and a sealing band formed of a soft material is fitted into the sealing band groove. , A large number of partitions are provided on the back surface of the sealing band facing the groove bottom surface of each of the sealing band grooves, and the sealing band back surface gap between the groove bottom surface and the sealing band back surface is partitioned in the direction of the spiral of the spiral blade. The fin-shaped protrusions are integrally formed with the sealing band.

A second means for solving the above-mentioned problems is to form the fin-like projection by a notch provided on the back surface of the sealing band.

A third means for solving the above-mentioned problems is to form the fin-shaped projections so that the fin-shaped projections are fitted by being bent by the groove bottom surface, and the projections are always biased toward the groove bottom surface. Is.

Effect According to the first means for solving the problems according to the present invention, since the fin-like projections on the back surface of the sealing band are formed of a soft material integrally with the sealing band, the gap on the back surface of the sealing band is reduced. Then, the fin-like projections are easily deformed accordingly, and the leaked gas is partitioned without generating a strong force.

Also, according to the second means, one side of the notch obliquely provided in the spiral winding partitions the gap on the back surface of the sealing band with a slight biasing force.

Further, according to the third means, the fin-like projections of the sealing band partition the gas leakage more reliably according to the change of the sealing band back gap.

Embodiment A scroll fluid machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. The same parts as the conventional one will be described with reference to FIG.

FIG. 1 shows a sealing band of a scroll fluid machine according to an embodiment of the present invention.

The sealing band 27a is made of a material obtained by reinforcing tetrafluoroethylene resin with fibers, and is formed integrally with the fin-shaped projection 31a on the back surface.

FIG. 2 is a sectional view of the sealing band groove portion provided with the sealing band 27a shown in FIG. 1 along the spiral and an enlarged view of a cross section perpendicular thereto.

FIG. 3 is an embodiment showing the second means of the present invention. A cut 31b is obliquely formed in the spiral on the back surface of the sealing band 27b, and one side surface 31b of the cut forms a fin-shaped projection.

FIG. 4 relates to the third means, in which a fin-shaped projection 31c is formed on the back surface of the sealing band 27c, and the tip of the fin-shaped projection is bent so that it is always in contact with the groove bottom surface 28. There is.

EFFECTS OF THE INVENTION According to the first means of the present invention, the fin-like projections provided on the back surface of the sealing zone partition the gas leakage along the spiral of the gap, so that a highly efficient fluid machine can be obtained. Furthermore, since this projection is fin-shaped and is made of a soft material, a strong axial force does not occur even if the tip of this projection contacts the bottom of the sealing band groove, so high reliability can be expected. At the same time, since it is not necessary to increase the dimensional accuracy related to the gap, it is possible to manufacture at low cost.

According to the second means of the present invention, since the protrusion is formed by cutting, the sealing band can be manufactured by inexpensive extrusion molding, and can be manufactured at an extremely low cost.

According to the third means of the present invention, since the above-mentioned gap is partitioned more reliably and in a wider range according to the size of the backside gap of the sealed band, higher reliability can be obtained and the manufacturing cost can be reduced. I can.

[Brief description of drawings]

FIG. 1 is a perspective view of a sealing band in a scroll fluid machine showing an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are seal groove portions showing a first embodiment of the scroll fluid machine. FIG. 3A and FIG. 3B are longitudinal sectional views and transverse sectional views, and FIG. 3A and FIG. 3B are longitudinal sectional views and transverse sectional views of a sealing body groove portion showing a second embodiment of the present invention. b) is a longitudinal sectional view and a transverse sectional view of a sealing member groove portion showing a third embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of a general scroll compressor of the related art, and FIG.
FIG. 7 is a plan sectional view of a compression mechanism portion of the compressor, FIG. 7 is a vertical sectional view of a main portion of the compression mechanism portion, and FIG. 8 is a perspective view of a sealing body of the compressor. 7 ... Fixed spiral blade, 10 ... Swirl spiral blade, 27a ... Sealing band, 27b ... Sealing band, 27c ... Sealing band, 31a ... Fin-shaped projection, 31b ... Projection, 31c ... Fin-shaped 32b ... notch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuharu Fujio 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroshi Karato, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 56) References JP-A-58-79602 (JP, A)

Claims (3)

[Claims] Claim: What is claimed is: 1. A fixed spiral vane component having a fixed spiral vane, a swirl spiral vane component having swirl swirl vanes that mesh with the fixed spiral vane to form a plurality of working spaces, and swirl drive the swirl spiral vane component. A crankshaft, a bearing component that supports the main shaft of the crankshaft, and a rotation restraining component that prevents rotation of the swirl vane component to rotate only, and the fixed swirl vane and the tip end portion of the swirl swirl vane are provided. A sealing band groove is provided, and a sealing band formed of a soft material is fitted into the sealing band groove, and the sealing band is sealed on the back surface of the sealing band facing the groove bottom surface of each of the sealing band grooves. A scroll fluid machine in which a large number of fin-shaped projections for partitioning the gap between the back faces of the sealing bands in the direction of the spiral of the spiral blade are integrally formed with the sealing band. 2. The scroll fluid machine according to claim 1, wherein a fin-shaped projection is formed on the back surface of the sealing band by a notch obliquely provided in the spiral. 3. The scroll fluid machine according to claim 1 or 2, wherein the fin-shaped projection is fitted in a state bent by the groove bottom surface, and the projection faces the groove bottom surface. A scroll fluid machine that is formed so as to be energized.