Gas compressor load discharging valve

Abstract

The load discharging valve for gas compressor includes valve body, valve rod, valve plate, driving piston, balancing piston, spring, gas guide passage, gas inlet passage, balance passage, and control passage. The valve plate, the balancing piston and the driving piston are connected through the valve rod. The balancing piston and the valve plate have the same diameter, equal end gas pressure and balanced forces, so that a small spring force can close the valve plate during the compressor is started, and the light load of the compressor has less impact to the power network. At the same time, a small driving cylinder can control the opening of the valve plate smoothly to reach the precise control of the compressor displacement. Compared with available technology, the present invention can operate at the conditions of high gas inlet pressure, great gas inlet pressure fluctuation and wide work range, and has long service life, small size, great flow rate, high performance and other advantages.

Description

technical field [0001] The invention belongs to the field of gas compressors, in particular to the technology of improving the unloading valve of the gas compressor. Background technique [0002] Unloading valve, also known as unloading valve, is widely used in the gas compressor industry. There are two main functions of the unloading valve: one is to prevent the compressor from opening the valve plate during the starting process, so as to ensure that the compressor starts with no load when there is no intake air, so as to reduce the starting current and avoid the impact of large starting current on the compressor. Power grid caused a strong impact. At this time, the gas can only enter a small amount of gas through the throttle hole on the valve plate to establish the pressure required for lubrication and ensure the lubrication of the compressor. The unloading valve can only be opened when the start-up is completed and the opening instruction is received, so that the compr...

AI Technical Summary

Problems solved by technology

[0004] The force caused by the pressure difference on the valve plate of the unloading valve is completely borne by the main spring, so the main spring is thick, and the thick spring brings the following disadvantages: ①The valve is bulky and heavy

②Because the end surface of the spring cannot be absolutely perpendicular to its axis line and the spring cannot be absolutely concentric with the cylinder, the cylinder will be eccentrically stressed, resulting in unstable movement of the cylinder and easy wear of the cylinder, resulting in poor performance and short life of the unloading valve

③The diameter of the power piston is large. When the compressor works under high pressure, the force on the power piston is large, which increases the size of related parts such as piston rod, valve plate, valve body, etc., and the cost is high.

In a process compressor, the inlet pressure P 1 High and unstable, the aforementioned disadvantages of the prior art unloading valve are more prominent

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