Small thrust measuring device

Abstract

The invention discloses a thrust measuring device applicable to a small thrust engine. The thrust measuring device comprises a static frame, a movable frame, an in situ calibration device, a force measuring component and a suspension part, wherein the movable frame, the in situ calibration device and the force measuring component are arranged on the static frame, and the suspension part is used for mounting an engine and can adjust the height of the engine. In the thrust measuring device, the suspension part is composed of a suspension block, a lifting bolt, a lifting thread bushing, an elastic element, a tension part and a rigidity tension and compression part or elastic tension and compression part, the engine is mounted by adopting a suspension way, the quantity of test accessories can be reduced, and mass can be reduced, so that inertia force and frictional force of a test device are reduced, and thrust measurement accuracy is improved; a mechanical loading mode is adopted for implementing static calibration, composition of the in situ calibration device is simplified, time of a test preparatory stage is shortened, and economy of the measuring device is improved; and for a specific engine, appropriate parts are selected for being assembled into the suspension part, and universality of a thrust device can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of machinery and aerospace testing, and in particular relates to a small-thrust aerospace engine measuring device. Background technique [0002] The test is the only way to determine the performance index of the engine, evaluate the reliability and life of the engine, and the only means to test the type and acceptance of the engine. From the perspective of engine test requirements for test equipment, test technology and test methods, the test content can be classified into four categories: assembly test; engine ground test; engine high-altitude simulation test; sub-level complete machine test test. Among them, the engine ground test covers more content, so the engine ground test test bench is relatively more important. [0003] The development of engine test technology mainly faces four problems: new issues encountered in low-temperature, high-pressure, and high-thrust engine test runs; issues that need to ...

AI Technical Summary

Problems solved by technology

[0020] 1. The activity space between the working platform and the test engine 2 is narrow, and it is inconvenient or even difficult to install a large number of test accessories (pressure / force / acceleration / temperature sensors, thruster supply pipes, ignition equipment, etc.), so the installation test preparation process Complicated, long test preparation time

[0021] 2. Currently, the components of the movable device installed horizontally on the workbench (such as guide rail sliders, support blocks, sliding / rolling bearing assemblies, etc.) are large in number and quality, and the inertial force and The friction force is large, resulting in a large loss of thrust, so this form of movable device is not conducive to accurate measurement of engine thrust;

[0022] 3. For high-precision test stands, hydraulic loading systems or mechanical lever devices (using standard masses as standard force) are currently used as in-situ calibration devices. The hydraulic loading system is complex and costly (requires good contact between interfaces and valves, Good sealing performance, strong pressure bearing performance), especially once the structural size of the pressure cylinder is determined, the hydraulic loading system can only be used for a specific test frame; the mechanical lever device cannot be used for static calibration of dynamic force measuring components, and cannot Ungraded calibration is implemented; therefore, the above two types of in-situ calibration devices have poor versatility and the function of the mechanical lever device is not perfect;

[0023] 4. The sliding or rolling performance and mass of different types of movable devices vary greatly. For different types of test engines, the measurement accuracy of the test frame is affected and the versatility is limited; in addition, the maintenance of movable devices (such as rolling / Replacement of sliding elements, lubrication, dust protection, etc.) is more complicated

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