JP2008280964A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient hermetic compressor by reducing sliding loss through reduction of sliding area of an eccentric axis of a shaft and a piston fitted therein in a hermetic compressor. <P>SOLUTION: A circular groove 14 of a diameter smaller than an outer diameter of the slide part of the eccentric axis 7 is provided on the eccentric avis of the shaft 7. Consequently, the efficient hermetic compressor is provided by reducing sliding loss by reducing sliding area between the shaft 6 and the piston 8 while inhibiting play of the piston 8. <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 a shaft thereof.

  Conventionally, a shaft of a hermetic compressor for an air conditioner or the like has a structure in which a part of an eccentric shaft is cut away. The configuration of the conventional example will be described with reference to FIGS. An electric motor element composed of a stator and a rotor, and a compressor element driven through a shaft by the electric motor element are arranged in the closed container to constitute a hermetic compressor.

  The compressor element includes a shaft, a piston fitted to the eccentric shaft of the shaft, a cylindrical cylinder that houses the piston, an upper bearing end plate that closes both ends of the cylinder, and a lower bearing end plate. It is comprised by. The upper and lower bearing end plates are paired with each other and rotatably support the shaft. As shown in FIG. 3, the shaft is composed of three parts: an upper shaft 12, an eccentric shaft 7, and a lower shaft 13.

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

  The eccentric shaft of the shaft and the piston constantly move relative to each other during the operation of the hermetic compressor, resulting in a sliding loss. Conventionally, there has been a problem that sliding loss between the eccentric shaft and the piston is large.

As a solution to such a problem, a method is known in which a notch that is stepped down with respect to the eccentric shaft is provided on the low-load side of the shaft eccentric shaft to promote lubrication with oil (for example, a patent) Reference 1).
JP-A-5-340370

  However, the structure as described above has a problem that the sliding area between the eccentric shaft of the shaft and the piston fitted to the shaft is large and the sliding loss is large.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly efficient hermetic compressor with a small sliding area.

  In order to solve the above problems, the present invention provides a circular groove having a diameter smaller than the diameter of the eccentric shaft on the eccentric shaft of the shaft.

  Accordingly, the sliding area can be reduced and the sliding loss can be reduced while suppressing the rattling of the piston.

  The shaft for a compressor of the present invention can provide a highly efficient compressor by suppressing the sliding loss between the shaft eccentric shaft and the piston.

  In the first aspect of the present invention, a circular groove having an outer diameter smaller than the outer diameter of the eccentric shaft is provided on the eccentric shaft of the shaft constituting the compressor element, thereby reducing the sliding area and suppressing the sliding loss. I can do it. In addition, holding the piston at the upper and lower ends of the eccentric shaft suppresses rattling of the piston and prevents leakage at the piston end face.

  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 shows a main part of a hermetic compressor showing an embodiment of the present invention. In FIG. 1, a circular groove 14 having a diameter smaller than the diameter of the eccentric shaft 7 is provided on the eccentric shaft 7 of the shaft 6.

  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 shaft 6 and the piston 8 always move relative to each other and slide. Conventionally, the contact area between the shaft 6 and the eccentric shaft 7 is large, and sliding loss occurs. With the circular groove 14 provided in the eccentric shaft 7 of the shaft 6 in the present invention, the sliding area can be reduced, the rattling of the piston can be suppressed, and the compressor performance can be improved.

  As described above, the hermetic compressor according to the present invention can reduce the sliding area and the rattling of the piston, and can provide a highly efficient hermetic compressor.

Sectional drawing of the hermetic compressor which shows one Example of this invention Side view of the shaft Side view of a conventional shaft 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 12 Upper shaft 13 Lower shaft 14 Circular groove

Claims (4)

An electric motor element and a compressor element driven by the electric motor element are provided in the hermetic container, respectively, and the compressor element has an eccentric shaft and a rolling piston fitted and slid on the eccentric shaft, and the eccentric shaft of the shaft is A hermetic compressor in which a circular groove is provided on the outer periphery. 2. The hermetic compressor according to claim 1, wherein the width of the circular groove is smaller than the width of the eccentric shaft. 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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