Sealing device of underwater test force measuring balance and use method of sealing device

Abstract

The sealing device comprises a watertight box with an opening in the upper portion, a cover plate is assembled at the opening end of the watertight box in a sealed mode to form an inflatable cavity, a balance supporting rod vertically penetrates through the cover plate to be installed, and the bottom end of the balance supporting rod extends into the watertight box. A force measuring balance is installed between the bottom of the balance supporting rod and the inner wall face of the watertight box. A distance exists between the outer wall surface of the balance support rod and the cover plate, the outer wall surface of the balance support rod is sleeved with a flexible sealing sleeve in an interference manner, the bottom edge of the flexible sealing sleeve laterally extends along the circumferential direction to form a horizontal part, and the horizontal part is attached and fixed to the top surface of the cover plate, so that the sealing installation of the force measuring balance in the watertight box is realized; and the balance supporting rod connected with the force measuring balance is flexibly sealed and installed through the flexible sealing sleeve, so that the stability and the reliability of the testing precision of the force measuring balance are greatly ensured while the sealing performance is ensured.

Description

technical field [0001] The invention relates to the technical field of underwater test measurement equipment, in particular to a sealing device for an underwater test force measuring balance and a method for using the same. Background technique [0002] The underwater test model is usually pulled by a trailer equipped with a pool to complete different attitude and motion tests. During the test, the hydrodynamic parameters of the model are measured by a force-measuring strain balance fixed to the model. [0003] In the prior art, the watertight method of the force measuring strain balance in the underwater test model is mainly to directly pour sealant on the strain balance measurement unit, so that the pasted strain gauge is fully isolated from the external medium to achieve watertightness; the advantage is the cost. Low, easy to operate, the balance body can be in direct contact with water; however, because the sealant is prone to water accumulation and water seepage due to ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the watertight method of the force-strain balance in the underwater test model is mainly to directly pour sealant on the strain balance measurement unit, so that the pasted strain gauges are fully isolated from the external medium to achieve watertightness; the advantage is that the cost Low, easy to operate, the balance body can be directly in contact with water; however, because the sealant is prone to water accumulation and water seepage due to peeling and aging, the resistance insulation value of the strain gauge will drop or even be damaged by short circuit; on the other hand, the sealant Finally, there will be shrinkage stress, which will also cause micro-strain to the strain balance unit, thereby reducing the measurement accuracy and service life of the strain balance

Images