JPH07189952A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enhance a sealing property so as to improve performance of a scroll compressor by supplying an adequate quantity of oil to each of a pair of compression chambers without increasing the total quantity of oil supplied to the compression chambers in a compressor incorporating a movable seal member at the tip of a turning spiral blade. CONSTITUTION:An opening area to a compression chamber 14 of a communication groove positioned on a winding end side of a turning spiral blade 11 out of two communication grooves, which are formed at a thrust surface of a fixed spiral blade part 10 so as to be communicated with a suction chamber, is set smaller than that of the other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in an air conditioner or the like.

[0002]

2. Description of the Related Art A conventional scroll compressor of this type will be described with reference to the drawings.

FIG. 4 is a vertical cross-sectional view of a horizontal scroll compressor having a structure in which an electric motor 103 and a compression mechanism 102 are arranged side by side in a closed container, and the space inside the closed container serves as a discharge chamber. 5 is an enlarged transverse sectional view of the compression mechanism portion.

Oil supply to the compression section in this compressor has been performed as follows. The lubricating oil in the oil reservoir 107 at the bottom of the discharge chamber is penetrated from the oil pump 142 mounted on the auxiliary bearing side of the drive shaft 106 into the drive shaft 106.
To the main bearing side. A part of this is an oil supply path 141 having a throttle mechanism provided inside the swirling spiral blade part 113.
As a result, the outer circumference of the swirl mirror plate 112 and the swirl mirror plate outer peripheral space 145 formed by the bearing component 121 having the main bearing enter the swirl mirror plate outer peripheral space 145, and are lifted up by the swirl motion of the swirl spiral vane 111 and provided on the thrust surface 165 of the fixed spiral vane component 109. It was configured to be fed from the two suction chamber communication grooves 147 and the oil supply groove 146 to the suction chamber located at the outermost periphery of the compression portion, and at the same time, guided to the inner compression chamber by this swirling motion.

[0005]

However, in the scroll compressor having the oil supply structure as described above, when the movable seal member is incorporated in the tip portion of the swirling spiral blade as shown in FIG. If sufficient oil is not supplied because a gap is created between the swirling spiral blade end plates,
There is a problem in that leakage occurs from the high-pressure side compression chamber that is surrounded by the fixed spiral blades to the low pressure side compression chamber that is surrounded by the swirl spiral blades, which causes deterioration of the compressor performance. As a measure to solve this problem, there is a method to increase the oil supply amount to the compression chamber to improve the sealing performance, but the heat loss of the working gas increases in proportion to the oil supply amount. It is not an appropriate measure.

In view of the above, the present invention provides a scroll compression system in which a large amount of oil can be supplied to the compression chamber side, which is surrounded by fixed spiral blades that require sealing, without increasing the total amount of oil supplied to the compression chamber. Machine.

[0007]

In order to solve the above-mentioned problems, the scroll compressor of the present invention has a structure in which a swirling spiral blade is wound in two communicating grooves to the suction chamber provided in the thrust surface of the fixed spiral blade component. The opening area of the communication groove located on the end portion side to the suction chamber is made smaller than that of the other.

[0008]

The operation of the present invention, which is configured as described above, is as follows.

Of the two communication grooves to the suction chamber provided on the thrust surface of the fixed spiral blade component, the communication groove having a small opening area to the suction chamber located on the winding end side of the swirl spiral blade is the swirl spiral blade. Since it faces both the suction chamber which is surrounded by the outside and the suction chamber which is surrounded by the fixed spiral vane, approximately the same amount of oil is fed into both suction chambers. On the other hand, since the communication groove having a large opening area to the other suction chamber faces only the suction chamber surrounded by the fixed spiral vane, the oil is sent only to that suction chamber. As a result, a large amount of oil is supplied as a ratio to the suction chamber side surrounded by the fixed spiral vanes. Since the oil supplied to each suction chamber is gradually guided to each high-pressure compression chamber inside by the swirling motion of the swirling spiral vanes, the compression chamber surrounded by the fixed spiral vanes on the outside is endowed with oil supply, The leakage path to the low pressure compression chamber, which is surrounded by the swirling spiral vanes on the outside, is sealed.

As described above, a large amount of oil can be supplied as a proportion to the side of the compression chamber surrounded by the fixed spiral blades that need sealing without increasing the total supply amount.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention constructed by incorporating a movable seal member at the tip of a swirling spiral blade will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor of the present invention, and FIGS. 2 and 3 are enlarged sectional views of a main part of a compression mechanism portion.

The compression mechanism 2 and the stator 4 of the electric motor 3 for driving the compression mechanism 2 are fixed inside the closed container 1, and the rotor 5 of the electric motor 3 is connected to the crankshaft 6 for driving the compression mechanism 2 to form the closed container 1 The periphery of the compression mechanism 2 is used as an oil sump 7. Compression mechanism 2
Has a fixed spiral blade component 10 having a fixed spiral blade 9 formed integrally with the fixed end plate 8 and a movable seal member 44 at the blade tip portion which meshes with the fixed spiral blade 9 to form a plurality of compression chambers 14. The swirl vane 11 is attached to the swivel end plate 1.
2, the swirling spiral blade component 13, the rotation restraining component 15 for preventing the rotation of the swirling spiral blade component 13 to rotate only, and the swirling spiral blade 11 of the swirling end plate 12.
Of the slewing drive shaft 16 provided on the opposite side to the main shaft 18 of the crankshaft 6, the eccentric bearing 17 into which the slewing drive shaft 16 is fitted, and the main bearing 19 for supporting the main shaft 18 of the crankshaft 6. And a flat plate part having an axial movement restricting plane 23 for restricting the axial movement of the swirl spiral blade part 13 with a minute gap from the end plate back surface 20 on the back surface of the swirl end plate 12. Place 24. A sliding partition ring 25 for partitioning the gas pressure applied to the end plate back surface 20 into a discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer circumference of the end plate back surface 20 is disposed on the flat plate component 24. The refrigerant gas sucked from the suction pipe 30 of the compressor is
The compression mechanism 2 enters the compression mechanism 2 from the suction port 32, is compressed in the compression chamber 14, and is discharged from the discharge port 34 to the discharge chamber 34, the discharge passage 35 provided on the outer circumference of the fixed end plate 8, and the discharge passage 36 provided to the bearing component 21. Is discharged to the discharge chamber 37 between the electric motor 3 and the compression mechanism 2. The discharged refrigerant gas is guided to the outside of the compressor from the discharge pipe 39 through the electric motor peripheral passage 38.

On the other hand, the oil forcibly supplied by the pump 42 from the oil sump 7 enters the expansion device 40 mounted in the swivel end plate 12 via the oil supply path 43 provided in the drive shaft 6.
The oil adjusted to an appropriate amount by the expansion device 40 is used as the turning end plate 1.
It is stored in the end plate outer peripheral space 45 formed by the outer periphery of 2 and the bearing component 21. The oil accumulated in the outer peripheral space 45 of the end plate is scraped up by the swirling motion of the swirl end plate 12, and the suction chamber communication hole 48 having a large opening area formed in the thrust surface 65 of the fixed spiral vane component 10 and the suction chamber having the same area. From the communication hole 47 and the oil supply groove 46, the gas is introduced into the respective suction chambers in an amount substantially proportional to the opening area thereof.

With the above structure, a large amount of oil can be supplied to the side of the compression chamber 14a surrounded by the fixed spiral blades on the outside, and efficient sealing of both compression chambers is possible without increasing the total supply amount. Therefore, the compressor performance can be improved.

[0016]

The effect of the present invention is that, of the two communication grooves to the suction chamber provided on the thrust surface of the fixed spiral blade component, the communication groove located on the winding end side of the swirl spiral blade is compressed to the compression chamber. By making the opening area of the compressor smaller than that of the other, a large amount of oil can be supplied to the compression chamber side, which is surrounded by the fixed spiral vanes, as a ratio, and the total amount of supply can be increased without increasing the amount of oil in both compression chambers. It is possible to efficiently seal and improve the compressor performance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor of the present invention.

FIG. 2 is an enlarged vertical sectional view of the compression mechanism section.

FIG. 3 is an enlarged cross-sectional view of the compression mechanism section.

FIG. 4 is a vertical sectional view of a conventional scroll compressor.

FIG. 5 is an enlarged transverse sectional view of a compression mechanism portion of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 airtight container 2 compression mechanism 3 electric motor 6 crankshaft 8 fixed end plate 9 fixed spiral blade 10 fixed spiral blade part 11 swirl spiral blade 12 swirl end plate 13 swirl spiral blade part 14 compression chamber 15 rotation restraint part 18 main spindle 19 main bearing 20 swirl mirror plate Rear surface 21 Bearing part 25 Sliding partition ring 40 Throttle device 42 Oil supply pump 43 Oil supply path 44 Movable seal member 45 End plate outer peripheral space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Morimoto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Shozo Hase, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Teruyuki Akazawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideo Hirano 1006 Kadoma, Kadoma City Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Sano Osaka Prefecture 1006 Kadoma, Kadoma-shi, Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A fixed spiral vane component in which an electric motor and a compression mechanism driven by this electric motor are arranged inside a hermetic container, and the compression mechanism has fixed spiral blades formed on a fixed end plate.
A swirling swirl vane component having a swirl swirl vane formed on a swirling end plate and having a movable seal member at a tip end portion which meshes with the fixed swirl vane and forms a plurality of compression chambers, and rotation of the swirl swirl vane component is prevented. A rotation restraint part that only turns, a crankshaft that drives the swirl vane part to swivel, and a bearing part having a main bearing that supports a main shaft formed on the crankshaft, and the swirl vane of the swirl end plate. A sliding partition ring is provided outside the turning shaft provided on the back surface of the opposite end plate to divide the pressure applied to the back surface of the end plate into a discharge pressure applied to the center and a pressure lower than the discharge pressure. An oil supply path that communicates the inside of the ring, the outer circumference of the swivel end plate, and the end plate outer peripheral space formed by the bearing component is provided inside the swirl spiral blade component through a throttle mechanism, and the end plate is also provided. Of the two communication grooves provided on the thrust surface of the fixed spiral vane component that communicates the circumferential space with the suction chamber provided in the fixed spiral vane component, the communication located on the winding end side of the swirl spiral vane. A scroll compressor having a structure in which the opening area of the groove to the suction chamber is smaller than that of the other.