JPH07189948A - Scroll compressor - Google Patents

Abstract

PURPOSE:To locally supply oil to a portion where a space of a compression chamber is enlarged due to a difference in thermal expansion between spiral blades so as to seal the space by opening an oil feeding groove formed at a thrust surface of a fixed spiral blade part on a side of an intake chamber surrounded by a turning spiral blade. CONSTITUTION:Refrigerant gas is introduced into a compressor mechanism 2 through a suction port 32, followed by compression in a compression chamber 14, to be discharged from a discharge port 33 to a discharge chamber 37 interposed between the compressor mechanism 2 and an electric motor via another discharge chamber 34 and the like. Meanwhile, oil is introduced into a throttle device 40 from an oil sump 7 through an oil feeding path 43 formed inside a crankshaft 6, followed by regulation in an adequate quantity, to be stored in an outer peripheral space of a turning end plate 12 having a turning spiral blade 11 of a turning spiral blade part 13. The stored oil is scooped by turning motion of the turning end plate 12, to be thus introduced into an oil feeding groove 46 formed at a thrust surface of a fixed end plate 8 having a fixed spiral blade 9 of a fixed spiral blade part 10 or toward a side of an intake chamber surrounded by the turning spiral blade 11.

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 a motor 103 and a compression mechanism section 102 are arranged side by side in a closed container, and the space inside the closed container serves as a discharge chamber. FIG. 4 is an enlarged cross-sectional view of the compression mechanism section.

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 143 having a throttle mechanism provided inside the swirling spiral blade part 113.
As a result, it enters the swirl mirror plate outer peripheral space 145 formed by the outer circumference of the swirl mirror plate 112 and the bearing component 121 having the main bearing, is lifted up by the swirl motion of the swirl spiral vane 111, and is provided on the thrust surface 165 of the fixed spiral vane component 110. 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 structure of oil supply as shown in FIG. 4, when the swirling spiral blade is made of a material having a large coefficient of thermal expansion with respect to the fixed spiral blade, the coefficient of thermal expansion during operation of the compressor is increased. There is a problem in that the gap between the compression chambers surrounded by the swirling spiral blades increases due to the difference between the two, causing performance deterioration due to leakage. In particular, in the compression chamber formed on the outermost periphery, this gap becomes large, and a countermeasure against it has been desired.

Therefore, the present invention provides a scroll compressor having a structure capable of supplying a large amount of oil to the side of the compression chamber in which this gap is generated during operation of the compressor.

[0007]

In order to solve the above-mentioned problems, a scroll compressor according to the present invention has an oil supply groove provided on the thrust surface of a fixed spiral vane part, which is surrounded by a swirl spiral vane on the suction chamber side. It is configured to open at.

[0008]

The function of the present invention is as follows.
When the compressor is running, the gap between the outermost compression chambers that are surrounded by the swirling spiral vanes becomes large due to the difference in the coefficient of thermal expansion between the swirl vanes. Oil can be supplied locally,
The gap can be efficiently sealed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which a fixed spiral blade is made of cast iron and a swirl spiral blade is made of aluminum will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor according to the present invention, and FIGS. 2 and 3 are enlarged sectional views 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
Is a fixed spiral blade component 10 having a fixed spiral blade 9 formed integrally with the fixed end plate 8, and a swirl spiral blade 11 that meshes with the fixed spiral blade 9 to form a plurality of compression chambers 14.
Swirl blade component 13 formed on the swirl end plate 12
A rotation restraint component 15 for preventing the rotation of the swirl spiral blade component 13 to rotate only, a swivel drive shaft 16 provided on the opposite side of the swirl spiral blade 11 of the swirl end plate 12, and a main shaft of the crankshaft 6. This swivel drive shaft 16 is provided inside 18
Eccentric bearing 17 into which is inserted, and the main shaft 1 of this crankshaft 6.
A bearing component 21 having a main bearing 19 for supporting 8 and an axial movement limit for limiting the axial movement of the swirling spiral blade component 13 with a small gap from the rear face plate 20 of the rear face of the swirling mirror plate 12. A flat plate component 24 having a flat surface 23 is arranged. 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 enters the compression mechanism 2 from the suction port 32 of the compression mechanism 2, is compressed in the compression chamber 14, and is provided from the discharge port 33 to the discharge chamber 34 and the outer periphery of the fixed mirror plate 8. The electric motor 3 and the compression mechanism 2 pass through the discharge passage 35 and the discharge passage 36 provided in the bearing component 21.
Is discharged to the discharge chamber 37 between. This discharged refrigerant gas is
It passes through the electric motor peripheral passage 38 and is guided to the outside of the compressor from the discharge pipe 39.

On the other hand, the oil forcibly supplied by the pump 42 from the oil sump 7 enters the throttle device 40 mounted in the turning end plate 12 through 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.
2 and the end plate outer peripheral space 4 formed by the bearing component
It is stored in 5. The oil accumulated in the outer peripheral space 45 of the end plate is scraped up by the turning motion of the turning end plate 12, and is guided from the oil supply groove 46 provided on the thrust surface of the fixed end plate 8 to the suction chamber side which is surrounded by the turning spiral blades. .

With the above-described structure, it is possible to realize a high-performance scroll compressor mainly by enhancing the sealing ability of the outermost compression chamber surrounded by the orbiting spiral vanes on the outer side, and the compression chamber on the same side.

[0014]

The effect of the present invention is that the oil supply groove provided on the thrust surface of the fixed spiral vane component is configured to be opened to the suction chamber side which is surrounded by the swirl spiral vane on the outside. During operation of the machine, when the gap between the outermost peripheral compression chambers surrounded by the swirling spiral vanes becomes large due to the difference in the coefficient of thermal expansion between the swirl vanes, the oil is supplied from the oil supply groove provided on the thrust surface of the fixed spiral vane component. Is locally supplied, and the gap can be efficiently sealed. The oil entering here is also guided to the inner compression chamber on the same side by the swirling motion of the swirling spiral vanes, which helps seal the gap, resulting in the compression of the side surrounded by the swirling spiral vanes on the outside. Improves the sealing performance of the entire room,
The performance of the scroll compressor can be improved.

[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 parts 25 Sliding partition ring 40 Throttle device 42 Oil supply pump 43 Oil supply path 45 Swivel end plate outer peripheral space 46 Oil supply groove 47 Communication hole

 ─────────────────────────────────────────────────── ─── 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 Kiyoshi Sano Osaka 1006 Kadoma, Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideo Hirano 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 swirl swirl vane component formed of a material having a larger thermal expansion coefficient than that of the fixed swirl vane component and forming a plurality of compression chambers meshing with the fixed swirl vane, on the swirl end plate; A rotation restraint component for preventing rotation of the spiral blade component to rotate only, a crankshaft for swing-driving the swirl blade component, and a bearing component having a main bearing for supporting a spindle formed on the crankshaft. The pressure applied to the back of the end plate of the turning end plate, which is provided on the end of the end face of the end plate opposite to the spiral blade, is divided into a discharge pressure applied to the center and a pressure lower than the discharge pressure. A sliding partition ring is provided, and an oil supply path that communicates the inside of the sliding partition ring with the outer circumference of the swivel end plate and the outer space of the end plate formed by bearing parts is connected to the swirl spiral via a throttle mechanism. An oil supply groove, which is provided inside the root part and which is provided on the thrust surface of the fixed spiral vane component that communicates the outer peripheral space of the end plate with the suction chamber provided in the fixed spiral vane component, is provided outward by the swirl spiral vane. A scroll compressor configured to open to the suction chamber side surrounded by.