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Scroll compressor and method of manufacturing the same

a compressor and roller technology, applied in the direction of machines/engines, rotary/oscillating piston pump components, liquid fuel engines, etc., can solve the problems of power loss and increase of oil loss, and achieve the effect of preventing agitation of surrounding fluid and preventing an increase in vibration

Inactive Publication Date: 2017-03-30
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a scroll compressor that has a balancer with a cylindrical shape that helps prevent fluid from getting stirred up when the balancer rotates. The balancer has no empty space inside it that could cause vibration or a difference in centrifugal force. This design prevents the compressor from getting more violent when it reaches its maximum speed.

Problems solved by technology

Thus, rotation of the balancer agitates surrounding fluid, causing the following problems.
When the balancer is arranged below a main bearing, oil dropped from the main bearing is scattered in the form of mist by rotation of the balancer and is moved to the compressor together with refrigerant, resulting in an increase of oil loss.
When the balancer is arranged in a frame above the main bearing, the balancer rotates in a space filled with oil, which leads to power loss due to agitation of the oil.

Method used

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  • Scroll compressor and method of manufacturing the same
  • Scroll compressor and method of manufacturing the same
  • Scroll compressor and method of manufacturing the same

Examples

Experimental program
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Effect test

embodiment 1

[0022]The following first describes the structure of a scroll compressor 100 according to the present Embodiment 1.

[0023]FIG. 1 is a vertical sectional view of the scroll compressor 100 according to Embodiment 1 of the present invention.

[0024]The scroll compressor 100 is configured to suck and compress refrigerant circulating in a refrigeration cycle, and discharge the refrigerant at high temperature and high pressure. As illustrated in FIG. 1, the scroll compressor 100 includes a compression mechanism unit and an electric motor unit in a shell, where the compression mechanism unit is arranged on an upper side, and the electric motor unit is arranged on a lower side.

[0025]The shell is a pressure resisting container including a middle shell 25 having a cylinder shape, a lower shell 26 sealed to an opening on a lower surface of the middle shell 25 by, for example, welding, and an upper shell 24 sealed to an upper surface opening of the middle shell 25 by, for example, welding.

[0026]Th...

embodiment 2

[0052]The following describes the present Embodiment 2. Any description duplicating with that in Embodiment 1 will be omitted, and any part identical or equivalent to that in Embodiment 1 will be denoted by the same reference numeral.

[0053]FIG. 4 is an enlarged view of the vicinity of a balancer-attached slider ASSY 40 of the scroll compressor 100 according to Embodiment 2 of the present invention. FIGS. 5(a) and 5(b) are each a diagram illustrating the balancer-attached slider ASSY 40 of the scroll compressor 100 according to Embodiment 2 of the present invention. FIG. 5(a) is a side view of the balancer-attached slider ASSY 40, and FIG. 5(b) is a sectional view taken along line B-B in FIG. 5(a).

[0054]In the present Embodiment 2, the compression mechanism unit is provided with the balancer-attached slider ASSY 40. The balancer-attached slider ASSY 40 includes a balancer-attached slider 40a in which a slider 40d is attached to a high-density balancer 40f, and a low-density part 40b ...

embodiment 3

[0058]The following describes the present Embodiment 3. Any description duplicating with that in Embodiment 1 will be omitted, and any part identical or equivalent to that in Embodiment 1 will be denoted by the same reference numeral.

[0059]FIG. 7 is a vertical sectional view of the scroll compressor 100 according to Embodiment 3 of the present invention.

[0060]In the present Embodiment 3, as illustrated in FIG. 7, the second balancer 13 includes a high-density part 52 and a low-density part 51 having a density lower than that of the high-density part 52.

[0061]Even when the scroll compressor 100 is operated while refrigerant is accumulated and the second balancer 13 is immersed in a mixture of liquid refrigerant and oil, the oil and the liquid refrigerant do not flow into the second balancer 13, causing no difference in centrifugal force of the second balancer 13 from a designed value, and preventing an increase in vibration.

[0062]FIGS. 8(a) and 8(b) are each a diagram illustrating a ...

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Abstract

A scroll compressor includes a fixed scroll including a spiral unit, an orbiting scroll including a spiral unit and combined with the spiral unit of the fixed scroll to form a compression chamber for compressing refrigerant, a main shaft for transmitting drive power to the orbiting scroll, an electric motor unit configured to rotate the main shaft, and a first balancer for compensating unbalance of the orbiting scroll with respect to a rotation center of the main shaft. The first balancer has an outline in a cylinder shape, and includes a high-density part made of a high-density material, and a low-density part made of a low-density material having a density lower than a density of the high-density material.

Description

TECHNICAL FIELD[0001]The present invention relates to a scroll compressor and a method of manufacturing the same, and particularly relates to the structure of a balancer.BACKGROUND ART[0002]Conventionally, two balancers or more have been attached to a main shaft of a scroll compressor to compensate centrifugal force of an eccentrically orbiting spiral of oscillatory movement. Each balancer has, for example, a semi-circular shape or a fan shape in plan view to achieve eccentricity of a barycenter. Thus, rotation of the balancer agitates surrounding fluid, causing the following problems.[0003]When the balancer is arranged below a main bearing, oil dropped from the main bearing is scattered in the form of mist by rotation of the balancer and is moved to the compressor together with refrigerant, resulting in an increase of oil loss. When the balancer is arranged in a frame above the main bearing, the balancer rotates in a space filled with oil, which leads to power loss due to agitation...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C29/00F04C29/02F04C18/02
CPCF04C29/0021F04C18/0215F04C29/0085F04C29/0057F04C2240/50F04C2230/603F04C2240/40F04C2240/60F04C2240/807F04C29/026F04C23/008F04C29/025
Inventor TAKAMURA, YUJI
Owner MITSUBISHI ELECTRIC CORP
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