JP2006002582A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of forcibly feeding oil by a displacement pump even in a transient state by solving a problem in a conventional one formed by using rolling bearings durable in an oil-less state or a bearing material with high self-lubricity wherein manufacturing cost is high in both cases. <P>SOLUTION: In this hermetic compressor, an oil feed passage to an auxiliary bearing part is formed in the displacement gear pump on the inner diameter side of an inner gear to secure the reliability of the auxiliary bearing part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic compressor used in the field of refrigeration and air conditioning.

A compression mechanism in the sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section, and the crankshaft is an electric motor There is a main bearing part on the compressor mechanism side and a lower sub-bearing part side, and the oil in the oil reservoir provided in the lower part of the hermetic container is passed through the crankshaft by the positive displacement gear pump. In the case of supplying to the moving part, the auxiliary bearing part is usually immersed in the oil reservoir, but the oil level may drop out due to a transient drop in the oil level, etc. In some cases, burn-in may occur.
JP-A-6-235387

  In the conventional technology, rolling bearings that have no lubrication or bearing materials with high self-lubricating properties were used, but in both cases, there were high costs and there was a transitional state. However, it is an object of the present invention to provide a hermetic compressor that can be forcibly lubricated by a positive displacement pump.

  In order to solve the conventional problem, a passage for forcibly supplying oil to the auxiliary bearing portion is provided in the inner gear of the positive displacement pump, and the auxiliary bearing portion is lubricated by the oil passing through the passage, whereby the auxiliary bearing portion is lubricated. It is possible to ensure improvement in reliability.

  The oil supply mechanism of the present invention can improve the reliability of the auxiliary bearing portion of the hermetic compressor.

  According to the first aspect of the present invention, since the passage to the auxiliary bearing portion side is set on the inner diameter side of the inner gear of the positive displacement gear pump, the pump capacity of the positive displacement pump can be achieved even when the oil level is lowered transiently. As a result, the oil is supplied to the auxiliary bearing portion, and the reliability of the auxiliary bearing portion can be improved at low cost.

(Embodiment 1)
FIG. 1 is a sectional view of a hermetic compressor. The refrigerant gas introduced into the sealed container 9 from the suction pipe 8 is compressed and discharged by the compression mechanism unit 1, and an electric motor 2 for driving the compression mechanism unit 1 provided below the compression mechanism unit 1, A crankshaft 3 for transmitting the rotational force of the electric motor 2 to the compression mechanism section 1, and the crankshaft 3 sandwiches the electric motor 2 and has a main bearing section 4 and a lower sub-bearing section 5 of the compressor mechanism section 1. An oil supply hole 3 a is provided in the crankshaft 3 for supplying oil in the oil reservoir 6 provided in the lower part of the sealed container 9 to the main bearing portion 4 of the crankshaft 3 and the compression mechanism portion 1 through the crankshaft 3 by the positive displacement gear pump 7. ing. FIG. 2 is an enlarged view of the positive displacement pump 7 of the present invention. The positive displacement gear pump 7 is composed of an inner gear 7a and an outer gear 7b. By providing an oil supply passage 7c to the auxiliary bearing portion 5 on the inner diameter side of the inner gear 7a, the auxiliary bearing portion 5 is forcibly supplied with lubricating oil. I can do it. By providing this oil supply passage 7c, the reliability of the sub-bearing portion 5 can be greatly improved at a low cost.

  As described above, the hermetic compressor according to the present invention provides a compressor having a sub-bearing portion that is cheaper than a conventional hermetic compressor and does not deteriorate reliability even in a transient state. be able to.

Sectional drawing of a hermetic compressor showing an embodiment of the present invention Parts diagram of positive displacement pump showing an embodiment of the present invention Parts diagram of positive displacement pump showing conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compression mechanism part 2 Electric motor part 3 Crankshaft 4 Main bearing part 5 Sub bearing part 6 Oil reservoir 7 Positive displacement pump 8 Suction pipe 9 Sealed container

Claims (1)

A compression mechanism in the sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section, and the crankshaft is an electric motor There is a main bearing part on the compressor mechanism side and a lower sub-bearing part side, and the oil in the oil reservoir provided in the lower part of the hermetic container is passed through the crankshaft by the positive displacement gear pump. A hermetic compressor having an oil supply mechanism for supplying to a moving part, wherein a passage to the sub-bearing part side is set on the inner diameter side of the inner gear of the positive displacement gear pump.

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