Mechanical seal performance testing device

Abstract

Provided is a mechanical seal performance testing device. The mechanical seal performance testing device comprises a main shaft, a working cavity with end caps at two ends, and two sets of mechanical seals to be tested. A shaft sleeve and the main shaft are in clearance fit and penetrate through the end caps at the two ends of the working cavity together. U-shaped openings on the same generatrix are arranged in two ends, extending out of the end caps, of the shaft sleeve, and a transmission pin is arranged on a portion, corresponding to the U-shaped openings, of the main shaft; two sections of threads which are equal in thread pitch and opposite in screwing direction are arranged in the middle of the shaft sleeve, and movable ring bases in the two mechanical seals to be tested are arranged on the back sides of two nuts screwed on the threads respectively; the movable ring bases and the shaft sleeve slide in the axial direction and are located and connected in the circumferential direction; a radial force sensor used for measuring end face friction torque indirectly is arranged on the transmission pin, and an axial force sensor used for measuring end face specific pressure is arranged between the back side of a static ring and the end cap of the working cavity; the end cap is provided with an annular ring which is concentric with a center hole, and therefore a leakage cavity used for collecting leakage amount is formed. The mechanical seal performance testing device is suitable for mechanical seal performance tests of various pressure working conditions and various size series, including performance tests of high-pressure and large-diameter mechanical sealing.

Description

technical field [0001] The invention belongs to the technical field of seal testing, and in particular relates to a mechanical seal performance test device with no axial additional force and precise measurement of torque, which is suitable for a large compressor, a centrifugal pump, or a stirring reactor for mixing high-pressure medium Performance testing of large diameter mechanical seals for rotating machinery. Background technique [0002] The large-scale, integrated, and long-term operation of production devices require matching mechanical seals with stable performance. Therefore, it is necessary to design and manufacture a mechanical seal performance test device with wide operating parameters and convenient testing to adapt to the development and testing of new mechanical seals. . [0003] It can be seen from the known technology that the main shaft support structure of the mechanical seal performance test device is mainly in the form of single cantilever shaft, double...

AI Technical Summary

Problems solved by technology

[0005] In addition, in the prior art above, what the torque sensor measures is the total torque on the main shaft in the test device, and the starting total torque when starting is 5-7 times of the normal running total torque, so the stress of the equipped torque sensor The diameter of the shaft is relatively large. Using this torque sensor to test the small end face friction torque of a mechanical seal in normal operation will result in less strain on the shaft and lower test accuracy.

In order to improve the measurement accuracy, the diameter of the stress shaft of the torque sensor should be smaller, but the stress shaft with a smaller diameter is prone to plastic deformation and even fracture

So you can't have both

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