JPH07224761A - Closed type compressor - Google Patents

Abstract

PURPOSE:To supply refrigerating machine oil stably by sucking the refrigerating machine oil at the bottom of a container by the crankshaft rotated by an electromotive element, and supplying it onto the sliding sections of a piston pin and a connecting rod through an oil hole connecting the sliding section of a bearing with the bore part of a cylinder. CONSTITUTION:This sealed compressor is equipped with a compression element 51 elastically supported by a sealed container 50 and an electromotive element 52 arranged on its compression element 51, and herein a piston 57, which slides inside the bore 56 of the cylinder of the compression element 51, is reciprocated through a connecting rod 58 by the rotation of a crankshaft 54 integrated with the rotor 53 in the electromotive element 52. In this case, an oil hole 1, which passes the sliding section of a bearing and the bore 56 of the cylinder, is made. At the time of rotation of the crankshaft 54 by the electromotive element 52, this sucks up the refrigerating machine oil enclosed at the bottom of the sealed container 50 and supplies it onto the sliding parts of a piston pin 59 and the connecting rod 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in refrigerators, air conditioners, dehumidifiers and the like.

[0002]

2. Description of the Related Art In recent years, the operation load of the hermetic compressor has increased due to the multifunctionalization of the system such as a refrigerator and the severe environment of use, and it is necessary to improve the abrasion resistance of the sliding portion.

A conventional hermetic compressor is disclosed in Japanese Patent Laid-Open No. 62-62.
There is one disclosed in Japanese Patent Laid-Open No. 186075.

The conventional hermetic compressor will be described below with reference to the drawings. FIG. 5 is a sectional view of a conventional hermetic compressor. In FIG. 5, 50 is a closed container, 51 is a compression element elastically supported by the closed container 50,
2 is an electric element arranged on the compression element 51, 53 is a part of the rotor of the electric element 52, 54 is a crankshaft fixed to the rotor 53, 55 is a bearing that pivotally supports the crankshaft 54, 56 is a cylinder bore portion of the compression element 51,
Reference numeral 57 is a piston that slides on the cylinder bore portion 56, 58 is a connecting rod that transmits the rotation of the crankshaft 54 to the piston 57, 59 is a piston pin that connects the connecting rod 58 and the piston 57, 60 is an oil supply hole formed in the connecting rod 58, 61 Is refrigerating machine oil sealed in the bottom of the closed container 50.

The operation of the hermetic compressor having the above structure will be described below. The refrigerating machine oil 61 sealed in the bottom of the closed container 50 is sucked up by the crankshaft 54 which is rotated by the electric element 52, and passes through the oil supply hole 60 formed in the connecting rod 58 and the piston pin 5
Refrigerating machine oil 61 is supplied to the sliding portions of the connecting rod 9 and the connecting rod 58.

[0006]

However, in the above structure, the oiling hole formed in the connecting rod is located at the position where the sliding load between the connecting rod and the piston pin is applied.
Since the sliding area is reduced and the surface pressure is increased, the possibility of abrasion of the connecting rod and piston pin increases when the operating load increases.

The present invention solves the conventional problems, and an object thereof is to reduce the surface pressure of the sliding portion between the connecting rod and the piston pin and to stably supply the refrigerating machine oil to the sliding portion.

[0008]

In order to achieve this object, a hermetic compressor of the present invention is fixed to a compression element elastically supported in a hermetic container, an electric element, and a rotor of the electric element. A crankshaft, a bearing that supports the crankshaft, a cylinder bore portion of the compression element, a piston that slides on the cylinder bore portion, a connecting rod that transmits the rotation of the crankshaft to the piston, the connecting rod and the piston. And a piston pin for connecting the above, and an oil hole for connecting the sliding portion of the bearing and the cylinder bore portion.

Further, a compression element elastically supported in a closed container, an electric element, a crankshaft fixed to a rotor of the electric element, a bearing for axially supporting the crankshaft, and a cylinder bore of the compression element. Section, a piston that slides in the cylinder bore section, a connecting rod that transmits the rotation of the crankshaft to the piston, a piston pin that connects the connecting rod and the piston, and an oil hole that connects the bearing and the cylinder bore section. It is composed of an opening on the bearing side of the oil hole provided in the non-sliding portion of the crankshaft.

Furthermore, a compression element elastically supported in a closed container, an electric element, a crankshaft fixed to a rotor of the electric element, a bearing for axially supporting the crankshaft, and a compression element of the compression element. A cylinder bore portion, a piston that slides on the cylinder bore portion, a connecting rod that transmits rotation of the crankshaft to the piston, a piston pin that connects the connecting rod and the piston, and an oil hole that connects the bearing and the cylinder bore portion. ,
An oil groove perpendicular to the sliding direction is formed at a position where no compression load is applied to the piston pin.

[0011]

In the hermetic compressor according to the present invention, the refrigerating machine oil sealed in the bottom of the hermetic container is sucked up by the crankshaft rotated by the electric element, and the piston is passed through the oil hole communicating the sliding portion of the bearing and the cylinder bore portion. Since the refrigerating machine oil is supplied to the upper part of the sliding portion between the pin and the connecting rod, it is possible to stably supply the refrigerating machine oil without having to make an oil supply hole in the connecting rod and reducing the sliding area of the connecting rod and the piston pin.

Further, by providing an opening on the bearing side of an oil hole which connects the sliding portion of the bearing and the cylinder bore portion to the non-sliding portion of the crankshaft, it is not necessary to make an oil supply hole in the connecting rod, and the connecting rod and piston pin are not required. The refrigerating machine oil is stably supplied without reducing the sliding area of the crankshaft and the sliding area of the crankshaft and the bearing is not reduced.

Further, by providing an oil groove orthogonal to the sliding direction at a position where the compression load of the piston pin is not applied, the refrigerating machine oil supplied from the crankshaft is supplied to the upper part of the sliding portion between the connecting rod and the piston pin and slides. Can be smoothly guided to the section.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a sectional view of a hermetic compressor in a first embodiment of the present invention.

In FIG. 1, reference numeral 1 is an oil hole which passes through the sliding portion of the bearing 55 and the cylinder bore portion 56.

The operation of the hermetic compressor constructed as above will be described below. The refrigerating machine oil 61 sealed in the bottom of the closed container 50 is sucked up by the crankshaft 54 rotated by the electric element 52, and the bearing 55
The oil is supplied to the upper portion of the sliding portion of the piston pin 59 and the connecting rod 58 through the oil hole 1 that communicates the sliding portion of the cylinder bore portion 56.

FIG. 2 is a sectional view of a hermetic compressor according to the second embodiment of the present invention. In FIG. 2, 2 is a bearing 55
And oil hole 1 made in the non-sliding part of the crankshaft 54
Is the opening. The refrigerating machine oil 61 enclosed in the bottom of the closed container 50 is sucked up by the crankshaft 54 rotated by the electric element 52, and the piston pin 59 and the connecting rod 58 are passed through the oil hole 1 that communicates the sliding portion of the bearing 55 and the cylinder bore portion 56. The opening 2 of the shaft hole 1 does not come into contact with the sliding portion of the crankshaft 54 when it is supplied to the upper portion of the sliding portion.

FIG. 3 is a sectional view of a hermetic compressor according to the third embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 of the hermetic compressor of the same embodiment. In FIGS. 3 and 4, reference numeral 3 denotes an oil groove arranged at a position where no compression load is applied to the piston pin 59 so as to be orthogonal to the sliding direction. The refrigerating machine oil 61 enclosed in the bottom of the hermetic container 50 is sucked up by the crankshaft 54 rotated by the electric element 52, and the piston pin 59 and the connecting rod 5 are passed through the oil hole 1 that communicates the sliding portion of the bearing 55 and the cylinder bore portion 56.
8 is supplied to the upper portion of the sliding portion and the refrigerating machine oil 61 is smoothly guided into the sliding portion by the oil groove 3 provided in the piston pin 59.

[0019]

As described above, in the hermetic compressor of the present invention, the refrigerating machine oil sealed in the bottom of the hermetic container is sucked up by the crankshaft rotated by the electric element, and the sliding portion of the bearing and the cylinder bore portion are communicated with each other. Refrigerating machine oil is supplied to the upper part of the sliding part between the piston pin and connecting rod through the oil hole, so there is no need to make an oiling hole in the connecting rod and a stable supply of refrigerating machine oil is possible without reducing the sliding area between the connecting rod and piston pin. Is.

Furthermore, by providing an opening on the bearing side of the oil hole which communicates the bearing with the cylinder bore in the non-sliding portion of the crankshaft, the sliding area between the crankshaft and the bearing is not reduced, and therefore wear resistance is achieved. Sex does not deteriorate.

Furthermore, by providing an oil groove perpendicular to the sliding direction at a position where the compression load of the piston pin is not applied, the refrigerating machine oil supplied to the piston pin and the connecting rod upper part of the connecting rod can be smoothly supplied by the oil hole. The reliability of the compressor can be improved because it can be guided into the sliding part of the compressor.

[Brief description of drawings]

FIG. 1 is a sectional view of a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a hermetic compressor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a hermetic compressor according to a third embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a sectional view of a conventional hermetic compressor.

[Explanation of symbols]

 1 Oil Hole 2 Opening 3 Oil Groove 50 Airtight Container 51 Compressive Element 52 Electric Element 53 Rotor 54 Crankshaft 55 Bearing 56 Cylinder Bore 57 Piston 58 Connecting Rod 59 Piston Pin

Claims (3)

[Claims] 1. A compression element elastically supported in a closed container, an electric element, a crankshaft fixed to a rotor of the electric element, a bearing rotatably supporting the crankshaft, and a cylinder bore of the compression element. Section, a piston that slides in the cylinder bore section, a connecting rod that transmits the rotation of the crankshaft to the piston, and a piston pin that connects the connecting rod and the piston, and the sliding section of the bearing and the cylinder bore section. A hermetic compressor characterized by having an oil hole communicating therewith. 2. The hermetic compressor according to claim 1, wherein an opening portion of the oil hole of the sliding portion of the bearing is provided in a non-sliding portion of the crankshaft. 3. The hermetic compressor according to claim 1, wherein an oil groove is provided orthogonal to the sliding direction of the piston pin at a position where no compression load is applied.