Reciprocating compressor

Patent metadata

Field	Value
Publication number	US-9512830-B2
Application number	US-201214004346-A
Country	US
Kind code	B2
Filing date	Mar 9, 2012
Priority date	Mar 10, 2011
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A reciprocating compressor of the present invention includes an electric component ( 6 ), a compression component ( 9 ), and a container ( 1 ). The compression component includes a cylinder ( 14 ), a piston ( 16 ), an eccentric shaft ( 33 ), a piston pin ( 23 ), a connecting rod ( 22 ), an oil feeding mechanism ( 51 ), a communicating passage ( 22 c ), an oil feeding passage ( 23 a ), a communicating hole ( 22 d ) which is provided in the connecting rod such that a smaller-shaft hole ( 22 b ) and an internal space of the piston are communicated with each other via the communicating hole, and discharges the oil fed to the smaller-shaft hole to the internal space of the piston; and an oil feeding port ( 23 b ) provided in the piston pin such that the oil feeding passage and the smaller-shaft hole are communicated with each other via the oil feeding port and feeds the oil fed to the smaller-shaft hole to the oil feeding passage; wherein the oil feeding port is provided in the piston pin in a location other than a location facing a location at which the communicating passage opens in the smaller-shaft hole.

First claim

The invention claimed is:

1. A reciprocating compressor comprising:
an electric component;
a compression component actuated by the electric component; and
a container which accommodates the electric component and the compression component and stores oil;
wherein the compression component includes:
a cylinder;
a piston which has an internal space which opens at an opposite side of a head portion thereof and is reciprocatable inside of the cylinder;
an eccentric shaft rotated by the electric component around an axis parallel to an axis of the eccentric shaft;
a piston pin provided in the piston so as to extend transversely in the internal space;
a connecting rod one end portion of which is rotatably fitted to the eccentric shaft and the other end portion of which is inserted into the internal space of the piston, the connecting rod being rotatably fitted to the piston pin in a smaller-shaft hole formed in the other end portion;
an oil feeding mechanism for feeding the oil stored in the container to a specified region of the connecting rod;
a communicating passage which is provided inside of the connecting rod such that the smaller-shaft hole and the specified region are in communication with each other via the communicating passage, and feeds the oil fed to the specified region by the oil feeding mechanism to the smaller-shaft hole, when the piston is in a suction stroke;
a first oil feeding passage which extends in an axial direction of the piston pin and opens in an outer peripheral surface of the piston;
a communicating hole which is provided in the connecting rod such that the smaller-shaft hole and the internal space of the piston are in communication with each other via the communicating hole, and discharges the oil fed to the smaller-shaft hole to the internal space of the piston; and
an oil feeding port which is provided in the piston pin such that the first oil feeding passage and the smaller-shaft hole are in communication with each other via the oil feeding port and feeds the oil fed to the smaller-shaft hole to the first oil feeding passage;
wherein the oil feeding port is provided in the piston pin in a location other than a location facing a location at which the communicating passage opens in the smaller-shaft hole,
wherein the specified region of the connecting rod is a larger-shaft hole which is formed at one end portion of the connecting rod and into which the eccentric shaft is fittingly inserted, the reciprocating compressor further comprising:
a main shaft having one end portion to which the eccentric shaft is connected such that an axis of the main shaft and the axis of the eccentric shaft are eccentric with respect to each other, the other end portion of the main shaft being immersed in the oil stored in the container, and the main shaft being rotated by the electric component around the axis of the main shaft;
wherein a second oil feeding passage is provided from the other end portion of the main shaft to an outer peripheral surface of a fitting insertion portion of the eccentric shaft which is fittingly inserted into the larger-shaft hole of the connecting rod, and feeds the oil stored in the container to the outer peripheral surface of the fitting insertion portion of the eccentric shaft,
wherein an oil feeding groove provided in the outer peripheral surface of the fitting insertion portion of the eccentric shaft or an inner peripheral surface of the larger-shaft hole of the connecting rod such that the second oil feeding passage and the communicating passage are in communication with each other via the oil feeding groove,
wherein the second oil feeding passage is provided in the eccentric shaft,
wherein a cross-section of the oil feeding groove which is perpendicular to the axis of the eccentric shaft is arc-shaped, and
wherein when the piston is in a suction stroke, the oil feeding groove causes the second oil feeding passage and the communicating passage to be substantially in communication with each other,
when the piston is in a compression stroke, the oil feeding groove causes the second oil feeding passage and the communicating passage substantially not to be in communication with each other,
the reciprocating compressor further comprising:
a discharge hole provided in the connecting rod such that the communicating passage and inside of the container are in communication with each other via the discharge hole.

2. The reciprocating compressor according to claim 1 ,
further comprising:
an oil groove provided in an outer peripheral surface of the piston pin or an inner peripheral surface of the smaller-shaft hole of the connecting rod such that the communicating passage and the communicating hole are in communication with each other via the oil groove.

3. The reciprocating compressor according to claim 2 ,
wherein the oil feeding port is provided in the piston pin such that the oil groove and the first oil feeding passage are in communication with each other via the oil feeding port.

4. The reciprocating compressor according to claim 1 ,
wherein the oil feeding port is provided in the piston pin in a location facing a location at which the communicating hole opens in the smaller-shaft hole when the connecting rod is rotating relative to the piston pin.

5. The reciprocating compressor according to claim 1 ,
wherein the oil feeding groove is configured such that a gap formed between the inner peripheral surface of the larger-shaft hole of the connecting rod and the outer peripheral surface of the fitting insertion portion of the eccentric shaft decreases as the gap is closer to its both ends.

6. A reciprocating compressor comprising:
an electric component;
a compression component actuated by the electric component; and
a container which accommodates the electric component and the compression component and stores oil;
wherein the compression component includes:
a cylinder;
a piston which has an internal space which opens at an opposite side of a head portion thereof and is reciprocatable inside of the cylinder;
an eccentric shaft rotated by the electric component around an axis parallel to an axis of the eccentric shaft;
a piston pin provided in the piston so as to extend transversely in the internal space;
a connecting rod one end portion of which is rotatably fitted to the eccentric shaft and the other end portion of which is inserted into the internal space of the piston, the connecting rod being rotatably fitted to the piston pin in a smaller-shaft hole formed in the other end portion;
an oil feeding mechanism for feeding the oil stored in the container to a specified region of the connecting rod;
a communicating passage which is provided inside of the connecting rod such that the smaller-shaft hole and the specified region are in communication with each other via the communicating passage, and feeds the oil fed to the specified region by the oil feeding mechanism to the smaller-shaft hole, when the piston is in a suction stroke;
a first oil feeding passage which extends in an axial direction of the piston pin and opens in an outer peripheral surface of the piston;
a communicating hole which is provided in the connecting rod such that the smaller-shaft hole and the internal space of the piston are in communication with each other via the communicating hole, and discharges the oil fed to the smaller-shaft hole to the internal space of the piston; and
an oil feeding port which is provided in the piston pin such that the first oil feeding passage and the smaller-shaft hole are in communication with each other via the oil feeding port and feeds the oil fed to the smaller-shaft hole to the first oil feeding passage;
wherein the oil feeding port is provided in the piston pin in a location other than a location facing

Assignees

• Hikichi Takumi
• Kita Ichiro
• Panasonic Ip Man Co Ltd

Inventors

• Hikichi Takumi
• Kita Ichiro

Classifications

• F04B39/0246

  in the rotating shaft · CPC title

• F04B53/008

  Spacing or clearance between cylinder and piston · CPC title

• F04B39/023

  Hermetic compressors · CPC title

• F04B1/00 Primary

  Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00) · CPC title