Mechanical seal performance test device and axial force and temperature measurement method between seal faces

Abstract

The invention discloses a mechanical sealing property testing device. An electric main shaft is connected with a single cantilever working main shaft; floating support of the single cantilever working main shaft is achieved by virtue of the geometric pressure compressing function of a moving ring end surface and a static ring end surface; the edge end of a force measurement sleeve is of a flange structure; an axial force strain piece is arranged on the force measurement sleeve; a shaft sleeve sleeves the single cantilever working main shaft and penetrates through end covers at the left end and right end of a sealing cavity; the shaft sleeve is slidably connected with the single cantilever working main shaft in a sliding manner in the axial direction and in a positioning manner by using an embedding block in the circumferential direction; two sections of threads of which the screw pitches are equal and the spiral lines are in opposite directions are formed in the shaft sleeve; the threads are respectively screwed with a left screw nut and a right screw nut; the back sides of two push rings respectively contact two moving ring bases; the moving ring bases are connected with the shaft sleeve in an sliding manner in the axial direction and in a positioning manner in the circumferential direction; a through hole which is communicated with a sealed end surface is formed inside a static ring; an infrared probe is arranged inside the through hole. Due to the structural design, measurement on property parameters such as large diameter and high rotation speed of mechanical sealing, particularly the measurement on the axial force and the temperature between sealed end surfaces can be achieved.

Description

technical field [0001] The invention belongs to the technical field of mechanical seal testing, and in particular relates to a sealing performance test device with no axial additional force, simple structure, convenient operation, and capable of accurately measuring the axial force and temperature between the sealing end faces of the moving ring and the static ring of the mechanical seal . Background technique [0002] As a shaft seal for centrifugal pumps, reactors, compressors and other dynamic equipment, mechanical seals are widely used in aviation, ships, petrochemicals, nuclear power plants and other fields. The large-scale of the device and the continuity of production, as well as the depletion of resources and the continuous deterioration of the environment, all put forward higher requirements for the performance of mechanical seals. Mechanical seals are divided into contact mechanical seals and non-contact mechanical seals. The difference between the two is that the...

AI Technical Summary

Problems solved by technology

However, due to the influence of parasitic capacitance and interference factors of capacitive sensors, the sensitivity will decrease, resulting in inaccurate measurement results, low test accuracy, and cumbersome test methods.

[0009] It is very difficult to accurately measure the temperature between the end faces of the mechanical seal. One is that sensors cannot be installed on the end faces of the moving ring and the static ring seal.

For contact mechanical seals, due to friction and wear on the end faces of the moving ring and the static ring, thermocouples cannot be placed directly on the end faces, otherwise they will be worn out; for non-contact mechanical seals, although the end faces of the moving ring and the static ring do not touch during stable operation , but during the startup or shutdown phase, both the moving ring and the static ring will contact to cause friction and wear. If the thermocouple is directly arranged on the end face, it will be worn out when starting

Second, because the temperature generated between the end faces of the moving ring and the static ring can only be maintained for a short time, it is difficult to measure directly by removing one of the friction pairs

However, because the measurement point is exposed to the air for a long time, the temperature generated at the moment of friction will drop rapidly after a very short period of time, which will greatly affect the measurement accuracy.

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