Combined type current-limiting venturi tube suitable for CVS and machining method of combined type current-limiting venturi tube

Abstract

The invention discloses a combined type current-limiting Venturi tube suitable for a CVS and a machining method of the combined type current-limiting Venturi tube. According to the technical scheme, the problems that in the prior art, a special cutter needs to be customized for overall machining of the flow-limiting Venturi tube, the whole flow-limiting Venturi tube is a multi-section splicing piece, the hydraulic characteristic of a channel is obviously affected by welding deformation, and the leakage risk caused by the quality problem of a welding seam is increased are solved. The component has the beneficial effects that the component can be processed in sections, each section can be independently replaced, and the leakage risk increased by the quality of a welding seam is avoided. A combined type flow limiting Venturi tube suitable for a CVS comprises a pipeline body, wherein the pipeline body is arranged in a hollow mode, and splicing sections are sequentially assembled in the pipeline body in the length direction of the pipeline body; the position of the splicing section in the pipeline body is adjustable, so that the lengths of the inlet straight pipe section and the outlet straight pipe section of the Venturi pipe can be adjusted, and the total length of the splicing section is smaller than or equal to the length of the pipeline body. All or a part of flow channels in the Venturi tube are formed in the assembling sections, and at least one section of the assembling sections is detachably connected with the pipeline body.

Description

Technical field [0001] The present invention relates to mechanical and petrochemical equipment, and in the field of nuclear power,, in particular, a combined current limiting venturi and its processing methods suitable for CVS. Background technique [0002] "Non-active safety system pressures, nuclear power technology" is a new three-generation + nuclear power technology, such as AP1000 and CAP1400, have broad development prospects due to their security and advancement. The Chemical and Volume Control System (CVS) in "Non-active Safety System Blow Pile Nuclear Power Technology" needs to maintain the coolant required for the reactive coolant system (RCS) to maintain the level of the regulator during operation of the nuclear power plant. In order to ensure the stability of the CVS hydrating flow, prevent the system overcurrent, and require a flow control device with high flow control accuracy, sensitivity, compact structure, and long service life. [0003] The inventors have found ...

AI Technical Summary

Problems solved by technology

[0003] The inventors found that the throat section of the existing Venturi tube has a small diameter and a high pipeline flow rate. Erosion and cavitation cause changes in pore diameter, resulting in reduced flow control accuracy, and finally the entire Venturi tube needs to be replaced and remanufactured

The replacement period is long and the cost is high. At the same time, the flow-limiting venturi tube is usually made of forgings as a whole, which requires custom-made special tools. Risk of leakage due to weld quality problems

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