Charge output element and ring-shaped shearing type piezoelectric acceleration sensor

Abstract

The embodiment of the invention provides a charge output element and a ring-shaped shearing type piezoelectric acceleration sensor which comprises a base, a piezoelectric element, a mass block, a pre-tightening part and a locking part, wherein the base comprises a supporting part, a connecting part and an installing hole; the piezoelectric element is sheathed outside the connecting part, and a ring-shaped gap is formed between the piezoelectric element and the connecting part; the mass block is sheathed outside the piezoelectric element; the pre-tightening part is inserted into the ring-shapedgap; the locking part is provided with a columnar part and a blocking part which are connected; all the elements are locked by matching of the columnar part and the installing hole; and the blockingpart abuts against a first end so as to lead the pre-tightening part to provide a radial pre-tightening force for fastening the piezoelectric element, the mass block and the base. The charge output element and the ring-shaped shearing type piezoelectric acceleration sensor provided by the embodiment of the invention have the advantages that due to rigid contact between the charge output elements,the contact rigidity of the whole structure can be greatly improved, and adhesion is not needed, so that the installation period of the charge output elements is effectively shortened.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a charge output element and an annular shear piezoelectric acceleration sensor. Background technique [0002] The piezoelectric sensor is assembled from various structures of different materials, and its output signal is proportional to the vibration acceleration suffered by the system. Therefore, the assembly of different materials and multiple structures makes the overall contact stiffness of the system insufficient, so that the frequency response characteristics of the piezoelectric sensor are harmonious. The low vibration will affect the reliability of its output signal. [0003] In order to realize the installation between the piezoelectric ceramics, the base and the mass block in the annular shear piezoelectric acceleration sensor, the method of epoxy bonding is generally used at present, although this method solves the problem between the piezoelectric ceramics and the bas...

AI Technical Summary

Problems solved by technology

[0002] The piezoelectric sensor is assembled from various structures of different materials, and its output signal is proportional to the vibration acceleration suffered by the system. Therefore, the assembly of different materials and multiple structures makes the overall contact stiffness of the system insufficient, so that the frequency response characteristics of the piezoelectric sensor are harmonious. The vibration is low, which affects the reliability of its output signal

[0003] In order to realize the installation between the piezoelectric ceramics, the base and the mass block in the annular shear piezoelectric acceleration sensor, the method of epoxy bonding is generally used at present, although this method solves the problem between the piezoelectric ceramics and the base. However, the quality and operation of the epoxy glue between the connecting layers are very high. If the epoxy glue contains impurities or bubbles are generated during operation, the overall stiffness of the product will be insufficient, which will reduce the overall stiffness of the sensor and affect the frequency response characteristics.

In addition, the gluing process requires a long baking time, which makes the installation cycle very long

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