Pistonphone with gap sealing structure and adjusting method thereof

Abstract

A pistonphone with a gap sealing structure comprises a cavity body, a piston and a support device, wherein a guide member is arranged between the cavity body and the piston; the outer surface of the guide member is hermetically connected with the inner wall of the cavity body, and the inner surface forms clearance fit with the piston; the guide member and the cavity body are coaxial; an annular air duct is formed in the outer surface of the guide member; communicated air holes pointing to the axis of the guide member are uniformly distributed in the annular air dust; an air source interface is communicated with the annular air dust. A pistonphone installation adjusting method comprises the following steps: horizontally placing the cavity body to ensure that the axis of the cavity body is coplanar to the axis of a drive component; inserting the piston into the guide member fed with high-pressure air, so that the piston is floated and is aligned to the cavity body; placing a gage block between a piston flange and the guide member to determine the balance position of the piston and the capacity of the cavity body, making the piston flange tightly cling to the drive component, fastening the piston flange, and fastening the cavity body with a cavity body bottom plate; removing the gage block and closing the high-pressure air source. The pistonphone provided by the invention can reduce sound pressure leakage in the cavity body, and meanwhile can ensure that no friction occurs between the piston and the cavity body.

Description

technical field [0001] The invention belongs to the technical field of acoustic measurement, in particular to a piston sounder and an installation and adjustment method thereof. technical background [0002] A microphone is an energy conversion device that converts sound signals into electrical signals. It is an important link in the electroacoustic system and is widely used in many fields such as vocal music, communication, and aerospace. In order to ensure that the output signal of the microphone is accurate and effective, according to the provisions of the measurement verification regulations, the sensitivity, frequency response and other performance indicators of the microphone must be calibrated before leaving the factory or after a period of use. [0003] The piston sounder is an important device to realize the calibration of the sound pressure sensitivity of the microphone. It drives the piston to do sinusoidal vibration with a given frequency and amplitude through th...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of the existing piston sounder structure that the piston outputs low-distorted displacement waveform and the leakage of the sound pressure in the cavity is restricted by each other, that is, under the premise of achievable assembly accuracy, if the If the sound pressure leaks, it is necessary to reduce the gap between the piston and the cavity, or add an additional sealing device, which is easy to increase the friction between the piston and the cavity during movement, and it is difficult to ensure that the piston outputs a low-distortion displacement waveform; or if you want to To reduce the distortion of the displacement waveform output by the piston, it is necessary to increase the gap between the piston and the cavity, resulting in an increase in the leakage of sound pressure in the cavity

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