JP2009068410A - Hermetic type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in a method for reducing the sliding loss by reducing the sliding area by forming a cut by providing a step to an upper shaft of a shaft against the upper shaft diameter which causes decrease in the shaft diameter of the upper shaft part of a shaft, thereby lowering the rigidity of the shaft and degrading the reliability of a compressor, and to improve the efficiency while maintaining the rigidity of the shaft of the compressor. <P>SOLUTION: A round groove of a diameter larger than the internal diameter of the upper bearing endplate 10 is formed on the inner diameter of the upper bearing endplate 10 to maintain the rigidity of the shaft 6, reduce sliding area of the shaft 6 and an upper bearing endplate 10, and reduce the sliding loss, thus a highly efficient compressor is realized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic compressor constituting a refrigeration cycle, and more particularly to the structure of the upper bearing end plate.

  Conventionally, in a hermetic compressor for an air conditioner or the like, an electric motor element composed of a stator and a rotor and a compressor element driven via a shaft by the electric motor element are respectively arranged inside the hermetic container. Configured. FIG. 4 is a sectional view of a conventional hermetic compressor, and FIG. 3 shows an upper bearing end plate of the conventional hermetic compressor.

  The compressor element 51 includes a shaft 61, a piston 8 fitted to the eccentric shaft 71 of the shaft 61, a cylindrical cylinder 9 that houses the piston 8, and an upper bearing end that closes both ends of the cylinder 9. It consists of a plate 101 and a lower bearing end plate 11. The upper and lower bearing end plates form a pair and also support the shaft 61. The shaft is composed of three parts: an upper shaft, an eccentric shaft, and a lower shaft.

  The operation of the conventional hermetic compressor configured as described above will be described. When the electric motor element 51 is operated, the refrigerant is sucked into the cylinder 9 and compressed as the piston 8 rotates, and the compressed refrigerant is discharged into the sealed container 1.

  The shaft 61 and the upper bearing end plate 101 are always in relative motion during the operation of the hermetic compressor, and a sliding loss occurs. Conventionally, there has been a problem that the sliding loss between the shaft 61 and the upper bearing end plate 101 is large.

As a solution to such a problem, a method is known in which a sliding area is reduced by providing a notch that is stepped down with respect to the upper shaft diameter on the upper shaft of the shaft 61 to reduce sliding loss. ing.
Japanese Laid-Open Patent Publication No. 1-121591

  However, in the structure as described above, there is a problem in that the shaft diameter is reduced due to a reduction in the shaft diameter of the upper shaft of the shaft, and the reliability of the compressor is impaired.

  The present invention has been made in view of the above problems, and an object thereof is to provide a highly efficient hermetic compressor while maintaining the rigidity of the shaft.

  In order to solve the above problems, the present invention provides a circular groove having a diameter larger than the inner diameter of the upper bearing end plate in the inner diameter of the upper bearing end plate.

  Accordingly, the sliding area between the shaft and the upper bearing end plate can be reduced and the sliding loss can be reduced while maintaining the rigidity of the shaft.

  The upper bearing end plate for a compressor according to the present invention can suppress a sliding loss between the shaft and the upper bearing end plate and can provide a highly efficient compressor.

  The first invention provides a sliding area between the shaft and the upper bearing end plate by providing a circular groove having a diameter larger than the inner diameter of the upper bearing end plate on the inner diameter of the upper bearing end plate constituting the compressor element. It is possible to reduce the sliding loss. Further, since the shaft diameter of the upper shaft of the shaft is not reduced, the rigidity of the shaft is not lowered, and the reliability of the compressor is prevented from being lowered due to the lowered rigidity of the shaft.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention, and FIG. 2 shows an upper bearing end plate. In FIG. 1, a circular groove is provided in the inner diameter of the upper bearing end plate 10.

  When the electric motor element 4 is operated, the rotor 3 is driven, and the piston 8 is driven through the shaft 6 as the rotor 3 is driven, and the refrigerant enters the cylinder 9 as the piston 8 rotates. Inhaled, compressed and discharged.

  During operation of the compressor, the upper bearing end plate 10 and the shaft 6 always move relative to each other and slide. Conventionally, by providing the upper shaft of the shaft 6 with a notch that is stepped down with respect to the upper shaft diameter, the rigidity of the shaft 6 is lowered and the reliability of the compressor is lowered. The sliding groove can be reduced by the circular groove provided in the inner diameter of the upper bearing end plate 10 in the present invention, and the rigidity of the shaft is not lowered, so that the reliability of the compressor can be improved. I can do it.

  As described above, the hermetic compressor in the present invention can prevent a reduction in sliding area and a reduction in shaft rigidity, and can provide a highly efficient and highly reliable hermetic compressor.

Sectional drawing of the hermetic compressor which shows one Example of this invention Side view of the upper bearing end plate Side view of a conventional upper bearing end plate Vertical section of the compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Stator 3 Rotor 4 Electric motor element 5 Compressor element 6 Shaft 7 Eccentric shaft 8 Piston 9 Cylinder 10 Upper bearing end plate 11 Lower bearing end plate

Claims (3)

A hermetic compression characterized in that a motor element and a compressor element driven by the motor element are provided in a hermetic container, and a circular groove is provided in an inner diameter of an upper bearing end plate constituting the compressor element. Machine. The hermetic compressor according to claim 1, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. The hermetic compressor according to claim 1, wherein a natural refrigerant such as carbon dioxide or ammonia is used as a refrigerant.

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