JPS60252184A - Scroll compressor - Google Patents

Abstract

PURPOSE:To improve the sealing performance between a high pressure receiving ring and a turning scroll while to reduce leakage of gas from high pressure chamber and to improve the capacity of compressor by inserting a seal ring through a resilient member into the seal ring groove made in the high pressure receiving ring. CONSTITUTION:A seal ring groove 45 is made in the sliding face of a high pressure receiving ring 40 along the inner and outercircumferential sides of high pressure chamber 43 then a resilient member or an O-ring 46 is inserted into the lower section of said seal ring 45 and a seal ring 47 is inserted through said O- ring 46 into the upper section. With such structure, the seal ring 47 is repelled by the O-ring 46 and energized to be pressure contacted against the back face 34 of a turning scroll 27 continuously. Consequently, the sealing performance between the turning scroll 27 and the high pressure receiving ring 40 is improved to reduce the leakage of high pressure gas from the high pressure chamber 43 as low as possible resulting in improvement of the compressor capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scroll compressor, and more particularly to a scroll compressor in which a high pressure receiving ring supporting an orbiting scroll is improved.

[Technical background of the invention and its problems] Recently, there has been a tendency to use scroll compressors for compressors such as refrigeration cycles. As shown in Figs. 6 and 7, this scroll compressor rotates a fixed scroll 1 and an orbiting scroll 2, which form spiral wraps Ia and 2a such as involutes, through a constant angle (180°). The fixed scroll 1 and the orbiting scroll 2 engage each other in a rotatable manner to form a closed crescent-shaped compressed space 3, and the orbiting scroll 2 is set at a certain eccentric distance with respect to the center 01 of the fixed scroll 1. e
By rotating the fluid while maintaining the same, the compression space 3 is moved toward the center of the vortex while being contracted, and fluid is sucked and compressed almost continuously.

FIG. 8 shows the conventional structure of the compression element 4 of a scroll compressor. As shown in the figure, the outer peripheral edge 5 of the fixed scroll 1 is fixed to a frame 6 with bolts 7, etc., and the orbiting scroll 2 meshed with the fixed scroll 1 is rotatably housed in the frame 6 and its The back surface 8 on the opposite side to the wrap 2a was in sliding contact with a high pressure receiving ring 9 and was supported by the frame 6 via this high pressure receiving ring 9.

The high pressure receiving ring 9 is provided on a mounting surface 10 of the high pressure receiving ring formed in the upper part of the frame 6, and an upper surface 11 on which the orbiting scroll 2 slides has a high pressure chamber for reducing the thrust pressure. 12 were formed. and,
The high pressure chamber 12 was configured to be supplied with fluid during or after compression in the compression space 3 through a communication hole 14 formed through a flat plate portion 13 of the orbiting scroll 2.

Further, a bearing portion 15 is formed approximately at the center of the back surface 8 of the orbiting scroll 2, and the bearing portion 15 is connected to an eccentric shaft portion 17 of a crankshaft 16 pivotally supported by the frame 6 to rotate the orbiting scroll 2. It was configured to be driven. An Oldham ring 18 is interposed between the orbiting scroll 2 and the frame 6 to prevent the orbiting scroll 2 from rotating when the orbiting scroll 2 is driven to orbit.

However, in the conventional compression element 4 configured as described above, the sealing performance of the sliding part between the high pressure receiving ring 9 and the orbiting scroll 2 was low, and a large amount of high pressure gas leaked from the high pressure chamber 12. . For this reason, the gas pressure in the high pressure chamber 12 decreased, and the thrust pressure of the orbiting scroll 2 could not be reduced sufficiently. Furthermore, the lubricating oil on the sliding parts is blown away due to the leakage of high-pressure gas, so there is also a problem in the lubricity of the sliding surfaces. Furthermore, in the past, the leaking high-pressure gas was the compressed fluid supplied from the compression space 3 during or after compression, which caused a reduction in the compression capacity of the compressor.

[Object of the Invention] The present invention has been devised in view of the above problems and to effectively solve them.

An object of the present invention is to provide a scroll compressor with improved sealing performance between an orbiting scroll and a high pressure receiving ring.

[Summary of the Invention] The present invention comprises a fixed scroll and an orbiting scroll each having a spiral wrap formed therein, which are rotatably engaged with each other with the wraps inside, and the peripheral edge of the fixed scroll is fixed to a frame. A high-pressure chamber is provided between the orbiting scroll and the frame to support the orbiting scroll, and to accommodate the orbiting scroll in a freely orbiting manner within the frame, and to reduce the thrust pressure of the orbiting scroll at the back surface of the orbiting scroll. A seal ring groove is formed on the sliding surface of the high pressure receiving ring along the circumferential side of the high pressure chamber, and an elastic member is inserted into the seal ring groove. A seal ring is inserted to achieve the above purpose.

[Embodiments of the Invention] ITR Drunkenness-111 I will explain in detail at once.

As shown in FIG. 5, the scroll compressor 21 is supported by a frame 23 within a casing 22, has an electric element 24 at its lower part, and a compression element 25 at its upper part. The compression element 25 is mainly composed of a fixed scroll 26 and an orbiting scroll 27, each of which has a spiral wrap 2 such as an involute formed in the same shape.
6a.

27a is erected. The fixed scroll 26 and the orbiting scroll 27 each have their wraps 26a, 2
They are rotatably engaged with each other with 7a facing inside, and a compressed space 28 closed in a crescent shape is formed by the spiral wraps 26a and 27a. Casing 22
A supply pipe 30 for supplying compressed fluid to the compression space 28 is connected to the side wall portion 29 of the compressor, and the compressed fluid is discharged through a discharge pipe 31.

The fixed scroll 26 is provided with its outer peripheral edge 32 fixed to the frame 23, and the orbiting scroll 27 is rotatably housed within the frame 23 and the wrap 2
A bearing portion 35 is formed on the back surface 34 of the flat plate portion 33 in which 7a is formed, and this bearing portion 35 is connected to an eccentric shaft portion 37 of a crankshaft 36 that is pivotally supported by the frame 23. That is, the orbiting scroll 27 is rotationally driven by the crankshaft 36 and is configured to revolve around the center of the fixed scroll 26 with a constant eccentric radius, so that the orbiting scroll 27 can be rotated in a constant direction with respect to the fixed scroll 26. As a result, the crescent-shaped compression space 28 is wrapped around the fixed scroll 26 and the orbiting scroll 27 268.27a.
It is configured to move along the spiral toward the center of the spiral while contracting.

FIG. 1 shows the fixed scroll 26 and the orbiting scroll 27.
The supporting structure is shown. As described above, the flange 38 formed on the peripheral edge 32 of the fixed scroll 26 is fixedly supported within the upper end 39 of the frame 23 by bolts or the like at appropriate intervals. On the other hand, the flat plate portion 3 of the orbiting scroll 27
A high pressure receiving ring 4 is located between the back surface 34 of 3 and the frame 23.
0 is interposed, and the orbiting scroll 27 is in sliding contact with the high pressure receiving ring 40 and is slidably supported thereon.

As shown in FIGS. 1' to 4, the sliding surface 41 of the high pressure receiving ring 40 is designed to reduce the downward thrust pressure on the orbiting scroll 27 caused by compressing the compressed fluid. A high pressure chamber 43 is formed. This high pressure chamber 43 is formed as an annular groove portion 44 . The flat plate portion 33 of the orbiting scroll 27 is provided with a communication hole 45 for supplying the compressed fluid to the high pressure chamber 43 during compression or after completion of compression. One end of this communication hole 45 faces the crescent-shaped compression space 28 formed by the fixed scroll 26 and the orbiting scroll 27, and the other end faces the high pressure chamber 43.
It is formed in the face of

Further, the sliding surface 41 of the high pressure receiving ring 40 has a seal ring groove 4 along the outer circumferential side and the inner circumferential side of the high pressure chamber 43.
5 is formed. An O-ring 46 as an elastic member is inserted into the lower part of the seal ring groove 45, and a seal ring 47 is inserted into the upper part via this O-ring 46. The seal ring 47 is urged by the O-ring 46 and is configured to be in pressure contact with the orbiting scroll 27 at all times. That is, as shown in FIG. 4, the sum of the thickness t47 of the seal ring 47 and the thickness t46 of the O-ring 46 is t47+t46 is thicker than the depth M5 of the seal ring groove 45.t47+t4B>h45 When the seal ring 47 is attached, the end face 48 of the seal ring 47 is set to be in contact with the sliding surface 4 of the high pressure receiving ring 40.
is configured to be higher than 1.

Also, as shown in FIG. 1, the orbiting scroll 27
An orbiting scroll 27 is provided between the fixed scroll 26 and the fixed scroll 26.
An Oldham ring 49 is interposed to restrict the rotation of the rotor when the rotor is driven to rotate so that the rotor rotates only. The fixed scroll 26 and the orbiting scroll 27 are provided with key grooves 50.51 on the outer circumferential sides of their facing surfaces, and the key portion 52 of the Oldham ring 49 is engaged with the key grooves 50.51. Also, the key groove 50°51
The key groove 50 on the fixed scroll side and the key groove 51 on the orbiting scroll side are formed at a right angle to each other, and the illustrated cross section is a cross section at the right angle position.

Next, the operation of this embodiment will be described.

As shown in FIG. 3, a crescent-shaped compression space 28 formed by a fixed scroll 26 and an orbiting scroll 27
is contracted and moved toward the center of the spiral along the spirally erected wraps 26a and 27a as the orbiting scroll 27 is driven to rotate. As a result, the compressed fluid supplied from the supply pipe 30 is compressed in the compression space 28 and discharged from the discharge pipe 31.

At this time, the orbiting scroll 27, as shown in FIG.
Its back surface 34 slides on and is supported by the sliding surface 41 of the high pressure receiving ring 4o. Further, the high pressure chamber 43 formed on the sliding surface 41 is supplied with fluid to be compressed during compression or after completion of compression from the compression space 28 through the communication hole 45 .

Therefore, the downward thrust pressure of the orbiting scroll 27 caused by the internal pressure of the compressed fluid is reduced to the upper two high pressure chambers 43.
will be offset and reduced by the pressure from

On the other hand, the seal ring 47 provided on the sliding surface 41 of the high pressure receiving ring 40 is configured such that its end surface 48 is higher than the sliding surface 41.
By being pressed against the O-ring 46, the O-ring 46 is elastically deformed and the surfaces thereof are aligned. In other words, the seal ring 47 is urged by the O-ring 46 so as to be constantly pressed against the back surface 34 of the orbiting scroll 27. For this reason, the back surface 34 of the orbiting scroll 27 and the high pressure receiving ring 4
0 sliding surface 41 is improved, and the high pressure chamber 4
The amount of high-pressure gas leaking within 3 will be reduced as much as possible.

Therefore, the compression element 4 is prevented from being recompressed due to gas leakage, and its compression ability is improved. Further, since the pressure within the high pressure chamber 43 is also maintained high, the thrust pressure of the orbiting scroll 27 can be sufficiently reduced.

In addition, since the orbiting scroll 27 slides against the fixed scroll 26, the clearance factor that affects the capacity of the compression element 4 is reduced and stable capacity can be obtained. 40 and the sliding surface 41 are no longer required,
This eliminates the possibility of lubricating oil being blown away due to high-pressure gas leaks.

On the other hand, since the Oldham ring 49 is interposed between the fixed scroll 26 and the orbiting scroll 27, the accuracy of the positional relationship between the wrap 26a of the fixed scroll 26 and the keyway 50 is as high as that between the fixed scroll 26, the orbiting scroll 27, and the Oldham ring. 49, the precision of the frame 23 becomes unnecessary, and assembly becomes easy. Further, the space on the back side of the orbiting scroll 27 becomes larger, and the outer diameter of the high pressure receiving ring 40 and the eccentricity of the crankshaft 36 can be increased.

The seal ring 47 is preferably made of cast iron, Teflon, or the like.

Further, the compressed fluid may be introduced into the high pressure chamber 43 after completion of compression.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

[1] Since the high pressure receiving ring is provided with a seal ring groove and the seal ring is inserted into the groove via an elastic member, the sealing performance between the high pressure receiving ring and the orbiting scroll can be improved.

(2) Thereby, leakage of high pressure gas from the high pressure chamber can be reduced as much as possible, and the capacity of the compressor can be improved.

(3) Since the gas pressure in the high pressure chamber can be maintained high, the thrust pressure of the orbiting scroll can be sufficiently reduced.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the structure of the compression element of a preferred embodiment of the scroll compressor of the present invention, FIG. 2 is a plan view of the high pressure receiving ring, FIG. 3 is a side sectional view thereof, and FIG. The figure is a partial sectional view showing the state when the seal ring is installed, FIG. 5 is a broken perspective view of the scroll compressor, FIGS. 6 and 7 are views showing the meshing state of the fixed scroll and the orbiting scroll,
FIG. 8 is a side sectional view showing the structure of a compression element portion of a conventional scroll compressor. In the figure, 2.23 is a frame, 26 is a fixed scroll, and 27
is an orbiting scroll, 26a and 27a are spiral wraps,
32 is the peripheral edge of the fixed scroll, 34 is the back surface of the orbiting scroll, 4o is the high pressure receiving ring, 41 is the sliding movement of the high pressure receiving ring, 43 is the high pressure chamber, 45 is the seal ring groove, 46 is the elastic member, 47 is the seal ring It is. Agent Patent Attorney Noriyuki ChikaFigure 1Figure 2Figure 4

Claims (1)

[Claims] A fixed scroll and an orbiting scroll each having a spiral wrap formed thereon are rotatably engaged with each other with the wraps inside, and the peripheral edge of the fixed scroll is fixedly supported on a frame, and the orbiting scroll is mounted within the frame. The back surface of the orbiting scroll is slid on a high pressure receiving ring interposed between the orbiting scroll and the frame and forming a high pressure chamber for reducing the thrust pressure of the orbiting scroll. A seal ring groove is formed on the sliding surface of the high pressure receiving ring along the circumferential side of the high pressure chamber, and the seal ring is inserted into the seal ring groove via an elastic member. Scroll compressor.