Oilless reciprocating air compressor

An air compressor, reciprocating technology, applied in the direction of liquid variable displacement machinery, mechanical equipment, engine components, etc., can solve the problems of reducing sliding performance and anti-seizing performance, and not improving the life of piston rings

Inactive Publication Date: 2005-09-07
ANEST IWATA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, metal plating such as Ni or Cr is applied to the inner surface of the cylinder, but Ni and Cr plating reduce sliding performance and seizure resistance
Especially in high pressure and high temperature operation, this does not improve piston ring life

Method used

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  • Oilless reciprocating air compressor
  • Oilless reciprocating air compressor
  • Oilless reciprocating air compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The oil-free reciprocating air compressor according to the present invention has the following structural features:

[0029] cylinder

[0030] Size: hole 50mm, 75mm

[0031] Material: Al or Al alloy

[0032] Inner surface: SiC coating formed by coating

[0033] The hardness of the coating: Vickers hardness (Hv) 1600-2400

[0034] The thickness of the coating: 15μm

[0035] Average surface roughness Ra: 0.05-0.5μm mirror polished

[0036] piston

[0037] Size: outer diameter 50mm, 75mm, height 50mm, 75mm

[0038] Material: Composite material of COPNA resin and graphite

[0039] piston ring

[0040] Size: nominal diameter 50mm, 75mm, width 4.53mm, thickness 4.0mm

[0041] Material: Composite material of polytetrafluoroethylene resin (TeflonTM) and graphite

[0042] Features: Tensile strength 13-35MPa, compressive strength 10-13MPa, Vickers hardness (Hv) 360-400

[0043] The COPNA resin from which the piston is made is a thermosetting resin prepared by crosslink...

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Abstract

In an oilless reciprocating air compressor, a piston reciprocates in a cylinder to compress a gas sucked from the outside and the compressed gas is discharged to the outside. The piston has an annular groove on the outer circumference, and a piston ring made of self-lubricating resin composite material is placed in the annular groove. The inner surface of the cylinder has SiC coating to increase the life of the piston ring, thereby allowing the compressor to be used at high pressure and high temperature efficiently to increase durability.

Description

technical field [0001] This invention relates to oil-free reciprocating air compressors. [0002] In US Patent No. 5,117,742, a piston in an oil-free reciprocating air compressor is made of resin and has an annular groove on its outer wall. A piston ring made of resin is fitted in the annular groove, and the piston reciprocates in the cylinder. [0003] In an oil-free reciprocating air compressor, it is not necessary to add lubricating oil to the piston rings, pistons or cylinders. No lubricating oil is introduced into the compression chamber in the cylinder, nor does the compressed air discharged from the compressor contain lubricating oil. Therefore, oil-free reciprocating air compressors are widely used in medicine, food or oxygen supply fields where oil is not desired in the compressed air, or for users who have difficulties in supplying and maintaining lubricating oil. [0004] When a resin piston is used, the cylinder is made of Al or Al alloy flattened, cast or die-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B39/00F04B39/02F04B39/04F16J9/26F16J10/04
CPCF04B39/042F04B39/0005F05C2203/0882F05C2251/042F05C2225/04F04B39/12F05C2201/021F16J1/01F16J9/12F16J10/02F16J10/04
Inventor 井上弘
Owner ANEST IWATA CORP
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