JP2705656B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Unexamined Patent Publication No. 1-178785, a conventional scroll compressor has an axial direction which is added from a compression work space to an orbiting end plate 11 of an orbiting scroll shown in FIG. In order to reduce the thrust force, the discharge head of the compression mechanism acts on the center side of the back surface of the revolving head plate, and the revolving head plate acts such that a pressure intermediate the discharge pressure and the suction pressure lower than the discharge pressure acts on the outside thereof. A minute space 19 between the bearing member 18 and the axial support portion 24 is partitioned by a back pressure partition band 21 slidably in contact with the back surface of the turning head plate. The back pressure partition band 21 is provided with a lubricating oil having a pressure equal to the discharge pressure of the compression mechanism acting on the center side of the back surface of the revolving head plate 11, and a back pressure formed on the bearing member 18 that accommodates the back pressure partition band 21. By flowing into the partition band storage groove 22, it is pressed against the back of the turning head plate 11.

[0003]

In the above-mentioned prior art, the operation of the back pressure divider band tends to be unstable, especially immediately after starting or depending on operating conditions, and therefore, the turning head plate is required. The lubricating oil near the discharge pressure excessively flows into the back pressure chamber lower than the discharge pressure without being pressed against the back surface of the compressor, and the power loss due to sliding of the plane of the revolving head plate increases, thereby reducing the efficiency of the compressor. At the same time, reliability is reduced.

In order to solve the above problem, as shown in FIG. 5, a means for stably sealing and sliding by putting a spring member 23 such as a leaf spring or a coil spring on the back surface of the back pressure partition band 21 can be considered. However, the back pressure partition 21 is generally made of a relatively soft resin material such as PTFE in consideration of the sealing property. The back pressure partitioning band 21 slides while being pressed from the back surface by the spring member 23 and the pressure. At this time, the position pressed by the spring member 23 is partially pressed more strongly, so that abrasion is easily promoted locally. Conversely, there is a problem that a portion that is not pressed by the spring member 23 has a gap with the revolving end plate 11 and impairs the sealing performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve the sealing performance of a back pressure partition and prevent partial wear.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a back pressure partition band which seals and orbits a turning end plate of an orbiting scroll of a scroll compressor so as to apply two kinds of pressures to a bearing. A spring member is provided via a ring-shaped member so as to be housed in a groove of a member or the like and slidably pressed against the revolving head plate.

[0007]

With the above structure, even when a relatively soft resin material such as PTFE having a good sealing property is used for the back pressure partition, the spring force is applied to the back pressure partition via the ring member.
The force pressed against the back surface of the revolving head plate is equalized over the entire sliding contact surface, so that wear is not partially promoted and the sealing performance is improved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of a compression mechanism of the compressor, and FIG. 3 is an enlarged longitudinal section near a back pressure partition zone of the compressor. The figure is shown. A stator 4 of an electric motor 3 for driving the compression mechanism 2 is fixed inside the closed casing 1, and a crank shaft 6 for driving the compression mechanism 2 is connected to a rotor 5 of the electric motor 3. The compression mechanism 2 is a revolving scroll blade that meshes with the fixed scroll 8 on the fixed frame 7 to form a plurality of compression work spaces 12.
It has a revolving scroll 9 formed on a revolving head plate 11 and an Oldham ring 13 for preventing the revolving scroll 9 from rotating and performing only a revolving motion. Swivel drive shaft 14 provided on the side
Is fitted into an eccentric bearing 16 provided inside a main shaft 15 formed at one end of the crankshaft 6, and the crankshaft 6 is supported by a bearing member 18 having a main bearing 17 supporting the main shaft 15. . Further, on the back surface of the turning head plate, it is slidable with respect to this back surface, shuts off the minute space 19, the discharge pressure of the compression mechanism 2 acts on the center side of the back surface of the turning head plate 11, and the outer back surface thereof A ring-shaped back pressure partition band 21 that partitions the pressure chamber 20 so that an appropriate intermediate pressure between the discharge pressure and the suction pressure acts on the pressure chamber 20.
Are arranged. The back pressure partition 21 is generally made of a resin material such as PTFE having a good sealing property. Further, the back pressure partition band 21 and the groove 22 formed in the bearing member 18 are formed.
A spring member 23 for pressing the back pressure partition band 21 against the back surface of the revolving head plate is provided. The spring member 23 may be provided with a number of coil springs, or may be a leaf spring such as a mage washer. The ring-shaped member 25 inserted between the back pressure partition 21 and the spring member 23 is made of a thin metal material.

Next, the operation of the embodiment of the present invention will be described. The refrigerant sucked from the suction pipe 26 of the compressor is supplied to the compression mechanism 2
Of the fixed frame 7 and the outer peripheral portion of the bearing member 18 from the discharge port 28 into the compression space 2 provided in the lower part of the compression mechanism 2. The air is discharged from the discharge pipe 31 to the outside of the compressor through a discharge communication hole 30 penetrating through the space and through a space in the sealed container. At this time, an axial thrust force is applied from the compression work space 12 to the orbiting head 11 of the orbiting scroll 9, and therefore,
Is pressed by the axial support portion 24 of the bearing member 18. However, the minute gap 19 on the back surface of the revolving head plate 11 is partitioned by a back pressure partition band 21, and the center side thereof is filled with lubricating oil for lubricating the compression mechanism 2 having the same pressure as the discharge pressure. Since an appropriate intermediate pressure lower than the discharge pressure acts on the outside thereof, the axial thrust force applied from the compression work space 12 side is offset by two kinds of pressures inside and outside the back pressure partition band, and the fixed frame body The contact force between the rotary head 7 and the turning head 11 can be reduced to a small value, and the sliding loss can be reduced. Further, immediately after start-up or depending on operating conditions, lubricating oil having a pressure acting on the center of the back surface of the turning head plate 11 does not flow into the groove 22 formed in the bearing member 18 accommodating the back pressure partition band 21, and the back pressure Divider
Even in the case where it is difficult to move the back pressure partition 21 in the direction pressed by the revolving head 11, the back pressure partition strip 21 is stably pressed against the back surface of the revolving head 11 by the spring member 23, whereby the back pressure partition is stably provided. Since the inside and outside of the belt are slidably sealed, lubricating oil near the discharge pressure excessively flows into the back pressure chamber lower than the discharge pressure, and power loss due to sliding of the plane of the revolving head plate increases, It does not lower the efficiency of the compressor or reduce the amount of lubricating oil, leading to lower reliability. Further, the spring member 23
Presses the back pressure partition band 21 locally, but because it is applied to the back pressure partition band via a metal ring member, the force pressed against the back surface of the turning head plate is equalized over the entire sliding contact surface, and the spring The part pressed by the step does not promote abrasion locally, and the part without a spring does not have sufficient pressing force, so that there is no gap and the sealing performance is improved.

[0010]

As described above, according to the present invention, a spring member is provided via a ring-shaped member for a back pressure partition band which seals and separates the orbiting end plate of the orbiting scroll so as to apply two kinds of pressures. Therefore, the force with which the back pressure divider band is pressed against the back of the revolving head plate is equalized over the entire sliding contact surface, and wear is not promoted locally, sealing performance is improved, and reliability is improved.
This has the effect that an efficient compressor can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a compressor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a compression mechanism of the compressor according to one embodiment of the present invention.

FIG. 3 is an enlarged vertical sectional view of the vicinity of a back pressure partition band of the compressor according to the embodiment of the present invention.

FIG. 4 is an enlarged longitudinal sectional view of the vicinity of a back pressure partition band according to a conventional example.

FIG. 5 is an enlarged longitudinal sectional view of the vicinity of a back pressure partition band according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 7 Fixed frame 8 Fixed scroll 9 Orbiting scroll 11 Orbiting head plate 12 Compression working space 18 Bearing member 19 Micro gap 20 Back pressure space 21 Back pressure partitioning band 22 Back pressure partitioning band storage groove 23 Spring member 24 Shaft Direction support part 25 Ring-shaped member

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Nobuyoshi Kojima 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-house (72) Inventor Sadao Kawahara 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shigeru Muramatsu 1006 Okadoma Kadoma, Kadoma City Osaka Pref. Yasushi Aiba 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-61-11487 (JP, A) JP-A-1-178785 (JP, A) JP-A 62-88 139991 (JP, A) JP-A-60-224988 (JP, A) JP-A-57-148002 (JP, A) JP-A-57-68579 (JP, A)

Claims (1)

(57) [Claims] 1. A fixed scroll, a fixed scroll, an orbiting scroll arranged to mesh with the fixed scroll to form a plurality of compression spaces, and an Oldham ring for preventing rotation of the orbiting scroll. A back pressure partition that is composed of a crankshaft that drives the orbiting scroll and a main bearing that supports the crankshaft, and that slidably seals and partitions the orbiting head of the orbiting scroll so as to apply two types of pressures. A scroll compressor in which a band is provided and a spring member for pressing the back pressure partition band is provided via a ring-shaped member.