A cryogenic liquid expander nozzle

Abstract

The invention discloses a low temperature liquid expander nozzle comprising a nozzle ring main body and a crank connection rod adjusting mechanism. The nozzle ring main body comprises a nozzle pedestal installed on a casing; a nozzle blade is rotationally fixed on the nozzle pedestal via parallel pins; the nozzle blade is connected with a nozzle rotating disc via the parallel pins in a chute; a nozzle press plate covers the nozzle blade and is fixedly installed on the nozzle pedestal; a compression spring is arranged between the nozzle press plate and the nozzle cover plate; the crank connection rod adjusting mechanism is formed by a gear transmission shaft axially installed on the nozzle pedestal; one end of the gear transmission shaft is provided with an adjusting rod and the other end is provided with a crank connected with a connection rod; and the other end of the connection rod is connected with the nozzle rotating disc via a fourth parallel pin. By the use of the low temperature liquid expander nozzle, flow of a liquid expander can be conveniently adjusted; a sealed air channel is arranged on the nozzle pedestal, so air medium can improve temperature of the adjusting structure and prevents the same from being frozen; and the low temperature liquid expander can effectively operate.

Description

technical field [0001] The invention relates to a low-temperature liquid expander device for throttling and reducing pressure of a low-temperature medium, in particular to an adjustable nozzle of a low-temperature liquid expander. Background technique [0002] Energy saving is a long-term strategic policy of my country's economic and social development. With the rapid development of the national economy, there is a greater demand for cryogenic liquefaction devices (such as liquefaction circulation systems such as air separation, nitrogen liquefaction, liquefied natural gas, and hydrocarbon processing), and reducing the energy consumption of these large-scale devices has important economic and social value. significance. In this type of liquefaction cycle device, it is often necessary to throttle and reduce the pressure of the low-temperature and high-pressure liquid to meet the requirements of the subsequent process flow. Usually, the traditional Joule-Thomson liquid throt...

AI Technical Summary

Problems solved by technology

However, the above nozzle adjustment mechanism has the following disadvantages: 1) The adjustment of the opening of the nozzle ring is completed by the adjustment rod of the volute, and it is necessary to drill a hole on the volute casing to realize the installation of the adjustment rod, which will lead to the leakage of high-pressure and low-temperature medium and system cooling loss; 2) The nozzle adjustment mechanism will make it difficult to locate the expander rotor, nozzle and other components in the axial direction, which is not conducive to the assembly of the unit; 3) Since the end of the transmission part of the nozzle adjustment mechanism is at ambient temperature, While the other end is in a low-temperature medium environment, the nozzle adjustment rod passing through the volute casing may be frozen, making the nozzle adjustment mechanism unable to work normally

However, in this structure, due to media leakage and other reasons, the adjustment structure may also freeze, making the nozzle adjustment actuator unable to operate normally.

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