Miniature integral cold air propeller

Abstract

The present invention relates to miniature fluid control element in precise machine and astronautics, and is especially miniature integral cold air propeller for satellite posture and position control. The pressure reducer, cut-off valve, shared seat, valve base, valve cap, sealing film and other parts constitute one integral structure, and the miniature planar nozzle is set near the air outlet of the cut-off valve. Elastic film and plate spring are used in the reducing and stabilizing of high pressure air to simplify the structure, machining and installation. Rolling ball valve core is used to raise the control pressure of the cut-off valve, and permanent magnetic suction is used to provide sealing pressing force of the cut-off valve and the restoring force of actuator. The main parts of the pressure reducer and the cut-off valver are in planar structure and integrally designed, and this makes it possible to transplant to planar miniature technique, and integrating the structural parts can omit assembly, reduce size and raise integration degree and control precision.

Description

technical field [0001] The invention belongs to the scope of microfluidic control elements in precision machinery and aerospace propulsion technology, and in particular relates to a micro-miniature integral structure cold air propeller. Background technique [0002] The thruster is an important actuator in aerospace technology. When working, it ejects the working substance (gas or ion) out of the nozzle at a high speed, and provides a driving force through the recoil of the ejection on the thruster and its carrier. ; According to the working principle, it can be divided into electric propulsion, chemical propulsion and cold air propulsion. In addition to the launch vehicle, the spacecraft is usually equipped with a thruster group as a position and attitude control system. Miniaturization is an important trend in the development of spacecraft at present, especially the emergence of small satellites with a total weight of 20kg or even less than 1kg, which are 1 to 3 orders of...

AI Technical Summary

Problems solved by technology

[0005] 1. The existing spring-type or piston-type pressure reducer has a complex structure, which is not conducive to miniaturization

[0006] 2. Ordinary cut-off valves can be divided into the following types according to the force characteristics and actuation direction of the opening and closing parts: 1) The movement direction of the opening and closing parts is parallel to the direction of fluid pressure, such as stop valves and diaphragm valves. The fluid pressure is directly overcome by the actuator, and the resistance is very large; 2) When the movement direction of the opening and closing parts is perpendicular to the direction of the fluid pressure, such as gate valves, plug valves, plunger valves and ball valves, what the actuator overcomes during the opening / closing action is The sliding friction between the valve core and the valve seat, and the area of ​​the sealing pair is large, if in order to ensure the sealing effect, filling the sealing packing in the sealing pair or increasing the sealing pre-tightening force will cause a large sliding friction force, otherwise, Leakage cannot be avoided, especially for gas valves; 3) The effect of fluid pressure on the opening and closing parts is force balance, such as butterfly valves, the structure is more complicated

The assembly structure and connecting pipes between the gas source, pressure reducer, valve and nozzle increase the size and weight of the system; at the same time, the dead volume of the system is increased, which reduces the control accuracy and dynamic response speed

[0009] 4. Existing pressure reducers and electronically controlled valves have complex three-dimensional structural features, and the overall design method of the propulsion system cannot be compatible with planar micro-processes such as silicon technology and LIGA technology, which limits the further miniaturization and array design of the propulsion system. possible

Images