JP2009257240A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost hermetic compressor having low fastening deformation and high efficiency since a bolt is fastened at very high torque to ensure that a cylinder, a main end plate, and an auxiliary end plate never slip after assembly, deformation is generated at a part near a bolt hole of a cylinder and large deformation is generated especially at a part near an opening part of the bolt hole where both of the end plates touches, and the deformation causes drop of performance, generation of abnormal noise, and the like in former hermetic compressors. <P>SOLUTION: Fastening deformation can be relaxed by forming the part near the opening part of the bolt hole provided at the cylinder in a tapered shape. Consequently, the hermetic compressor having low fastening deformation and high efficiency can be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used in an air conditioner or a refrigerator.

2. Description of the Related Art Conventionally, in a rotary type compressor, as shown in FIG. 2, an electric motor 113 that drives a compression mechanism 102 is fixed inside an airtight container 101, and a crankshaft 103 that drives the compression mechanism 102 is coupled to the electric motor. The compression mechanism 102 includes a roller 104 driven by a crankshaft 103, a cylinder 105 that is a cylindrical cylinder that houses the roller 104, a partition plate 106 that contacts the roller 104 and partitions the inside of the cylinder 105, and both end surfaces of the cylinder 105 It is comprised by the end plate which hold | maintains. The end plate includes a main end plate 107 and an auxiliary end plate 108. The end plate is disposed so as to hold the crankshaft 103 and also serve as a bearing so as to sandwich a compression mechanism. It is fixed by welding. The cylinder 105 is provided with a suction hole 109, and a gas to be compressed is introduced into the cylinder 105 from the suction connection pipe 110 press-fitted into the suction hole 109. Further, the main end plate 107 and the auxiliary end plate 108 are fastened to a screw portion provided in the cylinder 105 by using a bolt 111 (see, for example, Patent Document 1).
JP 2002-98075 A

  In the conventional configuration, since the bolt is tightened with a very large torque so that the cylinder, the main end plate and the auxiliary end plate are not displaced after being assembled, distortion occurs in the vicinity of the bolt hole of the cylinder. As a result, a large strain is generated in the vicinity of the opening of the bolt hole that is in contact with the head, and this strain has a problem that it causes a decrease in performance, generation of abnormal noise, and the like. This problem is particularly noticeable in alternative refrigerants and natural refrigerants where the difference between the suction pressure and the discharge pressure is large.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a high-efficiency hermetic compressor with less fastening distortion and an inexpensive hermetic compressor.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention is such that the vicinity of the opening of the bolt hole provided in the cylinder is tapered.

  As a result, since the cost of the bolt is reduced at the tapered portion, it is possible to reduce a large fastening strain generated in the vicinity of the opening portion of the screw hole that is in contact with the both end plates when the bolt is tightened. This effect is prominent in alternative refrigerants and natural refrigerants that increase the suction pressure and discharge pressure.

  The hermetic compressor of the present invention can provide a highly efficient hermetic compressor with less fastening strain.

In the present invention, when the main end plate and the auxiliary end plate and the cylinder are fastened with bolts, the vicinity of the opening of the bolt hole of the cylinder is tapered so that the main end plate, the auxiliary end plate and the cylinder are fastened. It is possible to reduce the distortion that occurs. Thereby, a highly efficient hermetic compressor with less fastening strain can be provided. In particular, the effect of improving the performance due to the reduction of the distortion appears remarkably in alternative refrigerants and natural refrigerants in which the difference between the suction pressure and the discharge pressure is large.

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

(Embodiment 1)
As shown in FIG. 1, in a rotary type hermetic compressor, a stator 4 of an electric motor 3 that drives a compression mechanism 2 is fixed inside a hermetic container 1, and the compression mechanism 2 is attached to a rotor 5 of the electric motor 3. A driving crankshaft 6 is coupled.

  The compression mechanism 2 includes a roller 7 driven by the crankshaft 6, a cylinder 8 that is a cylindrical cylinder, and a partition plate 9 that abuts against the roller 7 and partitions the inside of the cylinder 8 and an end plate that holds both end faces of the cylinder 8. Configured. Here, the end plate is disposed so as to be sandwiched from above and below by the main end plate 10 also serving as a bearing for holding the crankshaft 6 and the auxiliary end plate 11, and is fixed to the sealed container 1 by welding on the outer periphery of the main end plate 10. . The cylinder 8 is provided with a suction hole 12, and gas to be compressed is introduced into the cylinder 8 through a suction connection pipe 13 press-fitted into the suction hole 12. Further, the main end plate 10 and the auxiliary end plate 11 are fastened to the threaded portion provided in the cylinder 8 using bolts 14.

  Here, the vicinity of the opening of the screw hole 8a provided in the cylinder 8 is tapered. As a result, since the cost of the bolt 14 is reduced at the tapered portion, a large fastening distortion generated near the opening portion of the screw hole in contact with the both end plates when the bolt 14 is tightened is relieved.

  From the above, the hermetic compressor of the present invention can provide a highly efficient hermetic compressor with less fastening strain.

  As described above, since the hermetic compressor according to the present invention can provide a high-efficiency hermetic compressor with less fastening distortion, in addition to an air conditioner or a refrigerator, a dryer or a dehumidifier is provided. The present invention can also be applied to applications such as a hermetic compressor used for a heat pump type water heater and the like.

The longitudinal cross-sectional view of the compressor which shows the Example of this invention Detailed view of the present invention Vertical section of a conventional compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 3 Electric motor 8 Cylinder 8a Cylinder screw hole 10 Main end plate 11 Auxiliary end plate 14 Bolt

Claims (3)

An electric motor in the sealed container, a crankshaft driven by the electric motor, a roller driven by the crankshaft, a cylinder that houses the roller, a partition plate that contacts the cylinder and the roller and partitions the inside of the cylinder, Sealing with both end faces of the cylinder fastened with a plurality of bolts and having a main end plate that also serves as a bearing for holding the crankshaft and an auxiliary end plate, and the screw hole of the cylinder is tapered near the opening Mold compressor. The hermetic compressor according to claim 1, wherein the gas to be compressed is an alternative refrigerant not containing chlorine. The hermetic compressor according to claim 1, wherein the gas to be compressed is a natural refrigerant such as carbon dioxide.