Open type air-conditioning compressor shaft gland device

Abstract

The open-type air-conditioner compressor shaft sealing device is set among the cylinder, crank shaft and front cap of the compressor. There are several annular spring seat holes are uniformly provided on the outer shell of the shaft sealing device and the push springs are placed in these holes. On the thrust ring of the spring is provide with transverse oil groove not communicated with the circumferential surface of the crankshaft, the moving ring of the spring is made of silicon carbide material and the stationary ring of the spring is made of graphite material. The places of the lubrication oil grooves distributed along circumference on the outer shell of the shaft sealing device are staggered with the spring seat holes. Advantages: compact structure, good sealing effect, strong impaction resisting ability and long service life.

Description

Technical field: [0001] The invention relates to the field of air conditioner compressors, in particular to a shaft seal device of an open air conditioner compressor. Background technique: [0002] Open-type air conditioners are generally used in buses. The refrigerant commonly used in the compressor is R134a. Since this refrigerant can dissolve in lubricating oil, it is easy to leak from the seal of the compressor cylinder, especially from The seal at the end of the compressor crankshaft leaks out, so the performance of the seal at the shaft end of an open air-conditioning compressor is closely related to the leakage of the compressor. To overcome the leakage problem by improving the shaft sealing device of the compressor is a way that people in the industry have been working hard for a long time. [0003] The general structure of the commonly used open air conditioner compressor shaft seal device is shown in figure 1 schematic diagram. The crankshaft 001 of the open-typ...

AI Technical Summary

Problems solved by technology

[0011] The structure of the above-mentioned existing shaft sealing device adopts a single single coil spring 8' that is sheathed on the outer circumference of the crankshaft 3', and the space occupied by the single coil spring 8' is limited by structural parameters such as the wire diameter of the coil spring and the minimum effective number of turns. , cannot be extremely reduced, and the position space occupied by the shaft seal shell 6' cannot be installed with other parts such as the shaft seal shell screw 7', so the length of the shaft seal 01' cannot be effectively shortened, so the crankshaft 3' stretches The protruding length is relatively long, resulting in serious stress deformation, formation of gaps on the sealing surface 18' and deterioration of sealing performance

[0012] 2. The single spring structure is difficult to ensure the uniformity of the pressure on the moving ring, resulting in the sealing surface not being tightly bonded, resulting in leakage

In the structure of the above-mentioned existing shaft sealing device, the ring diameter of the single helical spring 8' is relatively large (greater than the diameter of the crankshaft 3'), so the pressure generated by its end ring contacting the moving ring 13' will have anisotropy, namely Inhomogeneity occurs at different positions in the radial direction, which will cause unevenness in the fitting tightness between the moving ring 13' and the static ring 14' in all directions of the diameter, thereby reducing the sealing performance of the sealing surface 18'. This disadvantage will be more serious in rotary motion

[0014] 3. During the intermittent operation of the compressor, the sealing surface 18' loses the infiltration of lubricating oil, and the sealing oil film is damaged by the refrigerant, resulting in the leakage of lubricating oil and refrigerant

Due to the strong penetration of gaseous refrigerant, especially R134a can dissolve lubricating oil, once a small amount of refrigerant gas penetrates into the sealing surface 18', it can destroy the sealing oil film, forcing the moving ring 13' to separate from the static ring 14', resulting in Seal failure at sealing surface 18', causing leakage at next compressor start-up

[0016] 4. The moving ring made of graphite material is easy to be damaged by impact during startup, resulting in failure of the shaft seal device

Due to the low strength of the graphite material, when the compressor starts, the impact of the huge torsion of the crankshaft 3' often causes the shaft seal shell 6' to damage the moving ring 13', resulting in failure of the entire shaft seal device and leakage

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