A discharge valve channel structure for a refrigerator compressor

Abstract

The invention discloses an exhaust valve channel structure for a refrigerator compressor, which can reduce the clearance volume and ensure the effective flow area of ​​the refrigerator compressor in the exhaust process; and can greatly reduce the offset of the exhaust hole The inhomogeneity of the flow field brought about can improve the cooling capacity and energy efficiency coefficient of the compressor at the same time. The invention includes a cylinder, a valve plate, and an exhaust valve plate. The valve plate is installed on the upper end of the cylinder, the exhaust valve plate is installed on the valve plate, and a piston is installed in the cylinder. There is an exhaust hole corresponding to the platform, and the exhaust valve plate covers the exhaust hole. When the piston is placed at the highest position, the boss is inserted into the exhaust hole and there is a flow gap between the outer wall of the boss and the inner wall of the exhaust hole. Tapering from bottom to top, the flow gap near the center of the piston is larger than the flow gap far away from the center of the piston.

Description

technical field [0001] The invention relates to a refrigerating compressor, more specifically, it relates to a channel structure of an exhaust valve for a refrigerator compressor. Background technique [0002] The clearance volume has a significant impact on the volume coefficient of the refrigerator compressor, mainly because the pressure ratio of the refrigerator compressor is high, and a considerable part of the cylinder volume occupied by the expansion of the clearance volume cannot absorb fresh gas, and the actual effective cylinder volume is smaller than the stroke. Capacity, which ultimately affects the cooling capacity of the refrigerator compressor. [0003] The volume occupied by the exhaust valve hole is the main component of the clearance volume of the refrigerator compressor at present, accounting for about 50%-70%. In order to reduce the influence of this part of the clearance volume, the existing design schemes generally set a boss on the piston corresponding...

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Problems solved by technology

[0004] Another important factor is that the suction and exhaust ports of refrigerator compressors are all arranged within the circular range of the valve plate corresponding to the cylinder, and the exhaust holes are generally arranged at positions deviated from the center of the cylinder, which will inevitably lead to The air flow field is not uniform, and the side of the boss close to the center of the cylinder has a larger mass flow rate, and the flow rate is larger; while the side away from the center of the cylinder has a smaller mass flow rate, the flow rate is correspondingly smaller.

Due to the non-uniform flow velocity, the flow loss is also greater

And due to the difference in speed, the airflow will generate a strong vortex in the exhaust channel and generate fluid noise

[0005] In the published patents and documents, it is mentioned that the effective flow area can be improved by optimizing the surface structure of the boss of the piston, the flow coefficient of the flow channel of the exhaust valve can be improved, and the pressure loss can be reduced; however, compared with the structure without boss, the effective The flow area is still reduced too much; and the asymmetry of the refrigerator compressor exhaust flow field is not considered

Therefore, the effect of improving the performance of the compressor is not very good, resulting in few applications of the boss piston scheme in existing refrigerator compressors

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