Assembling structure for spray pipe with external servomotor of water turbine

Abstract

The invention provides an assembling structure for a spray pipe with an external servomotor of a water turbine. After modification, a servomotor cylinder switch drives a spray needle screw to move forwards and backwards through a transmission block, and the spray needle screw and a spray needle are connected into a whole. The spray needle moves with the forward and backward movement of the spray needle screw, so that the control of a water flow rate is realized. As for the straight spray pipe with the external oil cylinder, the operating oil cylinder is located outside the spray pipe body, andsealing only needs to be carried out on high-pressure water in the spray pipe body. The sealing structure is simple, both the processing precision requirement and the processing difficulty of the spray pipe body are greatly reduced, and assembly is also simple and convenient. When the oil cylinder is repaired, the disassembly of the spray pipe is not needed. Both repair and maintenance are very convenient.

Description

technical field [0001] The invention relates to an external assembly of a hydraulic turbine, in particular to an assembly structure of a nozzle of an external relay of a hydraulic turbine. Background technique [0002] At present, the direct injection pipe of domestic impingement type (including oblique type) turbine basically adopts the structure of built-in oil cylinder, and the hydraulic efficiency of the straight injection pipe structure is 3% higher than that of the curved injection pipe. However, its structure is relatively complex, the precision of the parts is high, and the production and assembly are difficult. Since the water flow in the nozzle body has a higher water pressure (10 kg / cm2 to 60 kg / cm2), the pressure oil in the piston cylinder also has a higher pressure (40 kg / cm2 to 63 kg / cm2) . Therefore, this structure should not only seal the high-pressure water to prevent the high-pressure water from leaking into the piston cylinder and mix with the turbine oi...

AI Technical Summary

Problems solved by technology

So the sealing structure is quite complicated

The oil inlet and outlet holes are relatively difficult to process due to their small size and deep hole depth.

In addition, it is also difficult to maintain. When the piston seal ring needs to be replaced, the entire water inlet part must be removed, and the workload is quite large.

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