Volute of turbo-expander

Abstract

The invention discloses a volute of a turbo-expander. The volute comprises a volute body and a quick-closing valve; the quick-closing valve comprises a valve rod driven by a pneumatic or hydraulic orelectromagnetic driving device and a valve disk for closing an air inlet of the inner wall of the volute body; and the valve disk is driven by the valve rod to move up and down. According to the volute of the turbo-expander, the quick-closing valve is arranged at an inlet of the volute, and compared with the structure with the quick-closing valve externally arranged on an inlet pipeline, the volute has the advantage that the response speed of interlocked shutdown is higher, so that the safety of a unit is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of turbomachinery, and in particular relates to a scroll case of a turboexpander. Background technique [0002] A turbo expander is a machine that uses the principle of outputting mechanical work to reduce the temperature of the gas when the compressed gas expands and depressurizes to achieve a nearly adiabatic isentropic expansion process to obtain energy. It is usually transmitted to the brake through the main shaft connected to the impeller. Equipment, these braking equipment such as supercharger, generator, blower, pump, oil brake, etc. [0003] The turbo expander is generally composed of three parts: the flow part of the expander, the brake and the body. Among them, the flow part of the expander is a key part to obtain low temperature, which includes a volute, a nozzle, a working wheel and a diffuser. [0004] When the turbo expander is working, the working medium flows in from the inlet of the volute...

AI Technical Summary

Problems solved by technology

The volute of the turboexpander in the prior art is generally only provided with a nozzle flow regulating device, and the quick-closing valve is arranged on the inlet pipe of the expander. Although the expander can be closed, there are the following deficiencies: one is the peripheral The quick-closing valve is sometimes restricted by the layout of the pipeline, resulting in a distance between the quick-closing valve and the expander. There are major hidden dangers in the safety of the flat expander; second, the manufacturing process of the quick-closing valve body of the peripheral equipment in the prior art is generally casting, and the delivery cycle is long; third, the pressure and temperature measuring points of the expander in the prior art are generally It is installed on the inlet and outlet pipelines instead of the volute, and there are measurement errors, which cannot accurately reflect the performance of the expander;

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