Method for preparing sealing strip of scroll compressor

Abstract

The invention provides a method for preparing a sealing strip of a scroll compressor. The sealing strip prepared by using the method has high strength, a small thermal expansion coefficient, a small abrasion rate and long service life. The preparation method comprises the following step of mixing the following components in parts by weight: 20-30 parts of polybenzimidazole, 40-50 parts PEEK (Polyether-Ether-Ketone), 5-10 parts of carbon fiber and 3-5 parts of molybdenum disulfide, and carrying out hot-press forming.

Description

Technical field [0001] The technology relates to a method for preparing a sealing strip of a scroll compressor. Background technique [0002] The scroll compressor belongs to the prior art, which includes moving scroll (moving scroll), fixed scroll (fixed scroll), body, anti-rotation ring, eccentric shaft and other parts. The shapes of the movable scroll and the stationary scroll are exactly the same, the vortex is in an involute shape, and the center line of the two is separated by a radius of gyration during installation, and the phase difference is 180°. The static scroll is fixed on the body, and an exhaust hole is provided on the outside of the scroll line. The movable scroll is driven by the eccentric shaft to make it swing around the axis of the stationary scroll. In order to prevent the rotation of the movable scroll, an anti-rotation ring is installed in the structure. The movable scroll and the static scroll are inserted into each other to form several crescent-shape...

AI Technical Summary

Problems solved by technology

This leads to the following problems: 1. Since the height H is equal, the degree of sealing between the upper end surface 32 of the sealing strip and the inner bottom surface of the moving (static) scroll along the involute is the same, but due to the closer to the scroll The greater the pressure in the air cavity at the center of the scroll, the greater the leakage of the seal near the center of the scroll relative to the seal away from the center of the scroll, and it is difficult to increase the pressure of the gas discharged by the scroll compressor

2. When the gas is discharged at the center of the scroll, the pressure is relatively high, and this pressure acts on the inner end surface 34 of the sealing strip, causing the sealing strip to be compressed along the involute, causing the sealing strip to expand along the width direction and make its width larger , in severe cases, the sealing strip with larger width will crush the side wall 41 of the groove, causing the side wall of the groove to crack

3. When the sealing strip is working, the temperature is generally 100-200°C, and the pressure it bears is relatively large (up to 3MPa), the sealing strip will be deformed due to extrusion, and the physical properties of the sealing strip material will change , the wear resistance is reduced, and the wear is severe, resulting in seal failure

However, the existing sealing strip obviously cannot meet the requirements

During the compression process of the scroll compressor, the running-in surface of the sealing strip is gradually worn out in the high-temperature environment, the gap between the seals gradually increases, and leakage occurs, resulting in low efficiency or even failure of the compressor.

At present, the service life of the scroll compressor can only reach 1000-1500 hours, and it needs regular maintenance

Images