JP2000297769A - Scroll compressor - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To prevent a compressed gas from leaking from a corner portion in a scroll wrap. A fixed scroll (10) and an orbiting scroll (13), which house a motor and a pump unit connected to the motor in a sealed case, constitute the pump unit. Each of the end plates has a spiral wrap. In a scroll compressor in which a compression chamber is constituted by engaging each wrap, at least one of the scrolls is formed such that the center of the bottom surface between the wraps is depressed. As a result, the lubricating oil retained in the depression 300 at the center of the bottom surface is brought to the side surface by viscous and centrifugal force on the top surface of the meshed counterpart scroll wrap, and the space at the corner between the bottom surface and the side surface , The leakage of compressed gas is reduced, and an efficient scroll compressor can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll compressor suitable for improving the shape of a scroll wrap of a scroll compressor used for a refrigerating machine, an air conditioner or the like and improving the operation performance.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a bottom surface 100, 101 of a wrap of a fixed scroll 10 and a revolving scroll 13 is smooth-finished as shown in FIG. , 91 between the corners 95, 96 and the opposing lap top 100a, 101a
A space 200 is formed by the chamfers 100b and 101b provided in the first position.

[0003]

However, since the bottom surface of the conventional wrap is smooth-finished,
Lubricating oil is scraped off at the top surface of the mating lap engaged during operation, and seals the corner formed between the bottom and side surfaces and the space formed by the chamfer provided at the top surface of the mating lap. , The leakage of the compressed gas increases, and the efficiency of the scroll compressor decreases.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a scroll compressor which is improved in sealing at a corner portion between a bottom surface and a side surface and which is efficient.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is configured such that the center of the bottom surface of the scroll wrap is depressed as compared with the side surface. The lubricating oil retained in the depression at the center of the bottom surface of the scroll wrap is brought closer to the side surface by viscous and centrifugal forces on the top surface of the mating scroll wrap engaged with the top surface of the scroll wrap and seals the corner space between the bottom surface and the side surface. Thus, it is possible to reduce the leakage of the compressed gas and realize an efficient scroll compressor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a motor and a pump unit connected to the motor are housed in a sealed case, and the fixed scroll and the orbiting scroll constituting the pump unit are mounted on respective head plates. With a spiral wrap,
In a scroll compressor in which a compression chamber is constituted by engaging each wrap, a central portion of a bottom surface between at least one of the scroll wraps is formed in a concave shape. Then, by this, the lubricating oil retained in the depression in the center of the bottom surface is brought to the side surface by viscous and centrifugal force on the top surface of the mating scroll wrap engaged with the lubricating oil, and the space of the corner portion between the bottom surface and the side surface is removed. Sealing reduces the leakage of compressed gas, and an efficient scroll compressor can be realized.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In a conventional compressor, as shown in FIG. 2, a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside a closed container 1, and a rotor 5 of the electric motor 3 A crankshaft 6 for driving the compression mechanism 2 is fixed. The lower part of the sealed container 1 is a lubricating oil reservoir 7.

The compression mechanism 2 includes a fixed scroll 10, a revolving scroll 13 which meshes with the fixed scroll 10 to form a plurality of compression working spaces 14, and prevents only revolving scroll 13 from rotating. The orbiting scroll shaft 16 is inserted into an eccentric bearing 18 inside a journal bearing 17 formed at one end of the crankshaft 6, and the crankshaft 6 supports the journal shaft 17. It is supported by a main bearing member 20 having a bearing 19 and a sub-bearing 21 that supports a shaft portion of the crankshaft 6 on the side opposite to the journal shaft 17. These journal bearing 19 and sub bearing 2
Numerals 1 are fixed to the closed casing 1 by welding or the like by a main bearing member 20 and a sub-bearing support member 24, respectively. In addition, a casing 23 is formed on the sub-bearing 21 to provide an oil supply mechanism 22 at an end of the crankshaft 6. Casing 23
Is connected to an oil suction pipe 27, and this oil suction pipe 2
The lower end of 7 is immersed in lubricating oil reservoir 7.

In FIG. 1, a central portion 101c of the bottom surface 101 between the wraps of the orbiting scroll 13 is a side surface 101.
It is formed to be depressed as compared with d. This depression 300
When finishing the bottom surface 101, it can be easily formed by inclining the rotary tool in a direction parallel to the wrap and working. The top surface 100a of the fixed scroll engaged with the
A chamfer 100b is formed between the top surface 100a and the side surface 90 of the fixed scroll, and a space 200 is formed between the chamfer 100b and a corner 96 between the bottom surface 101 and the side surface 91 of the orbiting scroll. This corner 96
Since the cross-sectional area is larger than that of the seal between the side walls of the scroll wrap, the seal requires a large amount of lubricating oil.

In the above embodiment, the central portion 101 of the bottom surface
c stays on the top surface 100 of the fixed scroll.
a and viscous and centrifugal forces act on the side surface 101d by swirling motion to form a corner portion 96 and a chamfered portion 100d.
Since sufficient lubricating oil can be supplied to seal the space 200 with the space b, the space 200 can be sufficiently sealed, and leakage of the compressed gas can be reduced. Therefore, an efficient scroll compressor can be provided.

(Embodiment 2) The bottom surface 101 between the wraps of the orbiting scroll 13 has a gentle curve and a concave shape.

In the above embodiment, the central portion 101 of the bottom surface
c stays on the top surface 100a of the fixed scroll.
The lubricating oil is attracted to the side surface 101d by viscous and centrifugal force, but since the depression gradually becomes shallower from the center portion, the lubricating oil 7 accumulates in the chamfered 100b portion of the fixed scroll as the lubricating oil 7 goes to the side surface 101d. 7, the leakage of the compressed gas can be effectively performed.

(Embodiment 3) The amount of depression is in the range of 0.5 to 5 micrometers.
Has good sealing properties. When the depression amount is larger than 5 micrometers, the leakage of the compressed gas increases and the efficiency of the compressor starts to decrease.

(Embodiment 4) Further, the bottom surface 101 of the orbiting scroll is formed such that the bottom surface between the outer wraps of the scroll wrap is flat and the inner bottom surface is depressed.

In the above embodiment, since the refrigerant is compressed toward the inside of the scroll shape and the pressure increases, the leakage of the compressed gas from the corner portion 200 increases. At this time, since the inner bottom surface of the scroll has a concave shape, the seal of the space 200 at the corner portion is formed by the lubricating oil 7 retained in the central portion 101c of the bottom surface.
00a due to the viscosity and centrifugal force between
By moving to d, it can be done effectively
Compressed gas can be prevented from leaking, and a highly efficient scroll compressor can be provided. Forming the bottom of the scroll flat on the outside and concave in the inside can be easily realized by making the axis of the spindle tiltable, and realizing this shape more easily by using the magnetic spindle Is easy.

(Embodiment 5) The bottom surface 101 between the scroll wraps is not flat as shown in FIG. 1, but has a concave shape. In this drawing, the groove is formed as a gentle depression curve, but the same applies to a case where a pseudo bulge curve is formed by partially providing a groove or providing a plurality of grooves.

In this embodiment, the top surface 100a of the fixed scroll engaged with the bottom surface 101 of the orbiting scroll.
In this way, the corner space 200 can be effectively sealed with the lubricating oil 7 and an oil film is easily formed, so that the sliding loss in the thrust direction during operation can be reduced, and the efficiency can be improved. A scroll compressor can be provided.

[0019]

As is clear from the above embodiment, the center of the bottom surface of the scroll wrap is depressed as compared with the side surface, and the lubricating oil is retained, so that the bottom surface of the scroll wrap and the top surface of the meshed scroll wrap can be separated. It is possible to seal the space formed between the chamfer of the scroll wrap meshed with the side surface and the bottom surface, which is brought closer to the side wall due to the viscosity and the centrifugal force, thereby providing an efficient scroll compressor. .

[Brief description of the drawings]

FIG. 1 is a schematic view of a scroll wrap showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a horizontal hermetic scroll compressor.

FIG. 3 is a schematic view of a scroll wrap showing a conventional example.

[Explanation of symbols]

 Reference Signs List 7 lubricating oil 10 fixed scroll 13 orbiting scroll 90 side of fixed scroll 91 side of orbiting scroll 95 corner of fixed scroll 96 corner of orbiting scroll 100 bottom of fixed scroll 100a top of fixed scroll 100b chamfer of fixed scroll 101 orbiting scroll 101a Top surface of orbiting scroll 101b Chamfer of orbiting scroll 101c Central portion of bottom surface of orbiting scroll 101d Side surface portion of bottom surface of orbiting scroll 200 Space 300 dent

Claims (5)

[Claims] 1. A fixed scroll and an orbiting scroll that house a motor and a pump unit connected to the motor in a sealed case, and each of the end plates have a spiral wrap, A scroll compressor in which a compression chamber is formed by engaging each wrap, wherein a center portion of a bottom surface between at least one of the wraps has a concave shape. Machine. 2. The scroll compressor according to claim 1, wherein the shape of the depression is a gentle curve. 3. The scroll compressor according to claim 1, wherein the deepest portion of the depression has a depth of 0.5 μm to 5 μm. 4. The scroll compressor according to claim 1, wherein a bottom surface between the outer wraps of the scroll wrap is formed flat, and an inner bottom surface is formed into a concave shape. 5. A fixed scroll and an orbiting scroll which house a motor and a pump unit connected to the motor in a sealed case, and each of the end plates have a spiral wrap, A scroll compressor in which a compression chamber is constituted by engaging each wrap, wherein a bottom surface between the wraps of at least one of the scrolls is not flat.