CN2204417Y

CN2204417Y - Micro-vibration sensor

Info

Publication number: CN2204417Y
Application number: CN 94240121
Authority: CN
Inventors: 王海斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-01
Filing date: 1994-04-01
Publication date: 1995-08-02
Anticipated expiration: 2004-04-01

Abstract

The utility model relates to a micro-vibration sensor, comprising a full sealed screening outer shell, an electret microphone type vibration receiving converting unit, vibrators and wire outlet feet which are connected with the full sealed screening outer shell. The utility model is characterized in that the upper part of an electret microphone is additionally provided with a damping thin film (5), a free motion spherical vibrator (4) and a limiting ring (2); the damping thin film (5) is attached to the sound film (3) of the electret microphone; the limiting ring (2) is fixed on the top end of the screening shell body (1); the free motion spherical vibrator (4) is positioned on the damping thin film (5) of the limiting ring (2). The utility model has the advantages of simple manufacture technology, high sensitivity, small volume and omnidirectional vibration.

Description

Micro-vibration sensor

The utility model is a kind of micro-vibration sensor, belongs to sensor field.

Along with the develop rapidly of electronic technology, various sensors constantly are exploited, and vibration transducer also has multiple, disclosed on August 2nd, 1989 as the Chinese patent communique, application number is 89105108.X, applicant: Zhao Xijing, project name: capacitance-type vibration formula sensor; And for example: I with Wang Jue on January 2nd, 1991 application, comprehensive vibration transducer, application number is 91211134.8, the common feature of above-mentioned two kinds of patents, the vibration receiving element that the former taked is a condenser type, and the spring leaf oscillator is vertically fixed on the pole plate of electric capacity, and a weight is fixed on the oscillator top, this sensor is mainly used in side-to-side vibrations, can not comprehensively vibrate.The latter is the vibration that utilizes comprehensive resonant element, the sound film that promotes electret microphone through the rod member transmission produces vibration, change the output signal of microphone, be used for detecting the vibration of various objects, the common weak point of two kinds of vibration transducer existence is: because oscillator is fixed on vibrating diaphragm or the microphone sound film with different modes, because vibrating diaphragm or microphone sound film are very thin, intensity is very little, fixedly difficulty is bigger, simultaneously sometimes because of fixing not firm the failure.

The purpose of this utility model, just being to overcome the deficiencies in the prior art provides a kind of and can comprehensively vibrate, be easy to make, reliable operation, highly sensitive, the micro-vibration sensor that cost is low.

The purpose of this utility model, realize in the following way:

This micro-vibration sensor, receive converting unit by hermetically sealed screening can, the vibration of electret microphone formula, the stitch that goes out that oscillator links to each other with hermetically sealed screening can is formed, of the present utility model being characterised in that: above electret microphone, set up damping film 5, free movable spherical oscillator 4, spacing ring 2, damping film 5 are attached on the electret microphone sound film 3, spacing ring 2 is fixed on the top of screening can 1 inside, and free movable spherical oscillator 4 is positioned on the spacing ring 2 internal damping films 5.

Micro-vibration sensor of the present utility model, owing to adopt spherical free movable oscillator, be placed in the spacing ring 2 on the damping film 5, therefore, the faint rolling of oscillator will produce comprehensive vibration, selects the spherical oscillator of different geometrical size and different quality, can make the different micro-vibration sensor of specification of the various levels of shaking, compared with prior art have following advantage:

1, owing to adopt spherical free movable oscillator,, is easy to starting of oscillation, highly sensitive so manufacture craft is easy to control.

2, volume is little, makes simply, and cost is low, and is safe and reliable.

3, be suitable for the various vibrations of inspected object, can be widely used in automatic control, burglar alarm, the observation of mine roof pressure cycle waits the various fields that the condition of shaking is arranged, and does comprehensive vibration and passes element.

Fig. 1 is the inner structure synoptic diagram of the utility model micro-vibration sensor, is most preferred embodiment of the present utility model:

Among Fig. 1: 1 screen shell, 2 spacing rings, 3 microphone sound films, 4 spherical free movable oscillators, 5 damping films, 6 electret microphones, 7 go out stitch.

Below in conjunction with accompanying drawing micro-vibration sensor of the present utility model is elaborated:

The micro-vibration sensor of the present utility model of Zhi Zuoing as shown in Figure 1, damping film 5 is attached on the microphone sound film 3, spherical free movable oscillator 4 is placed in the spacing ring 2 and on the damping film 5, and spherical free movable oscillator 4 is can be on damping film 5 and in the cavity that surrounds with screening can 1 upper plane in the spacing ring 2 free movable or vibrate.Because the thickness of the limited ring 2 of distance between damping film 5 and screening can 1 upper plane is determined, be used for protection and damage microphone sound film when super the shaking because of the free movable oscillator 4 of sphere, remove out outside the stitch 7, all the other elements all are encapsulated in the metallic shield shell closely, therefore have the very strong anti-sound wave and the interference performance of anti-electromagnetic wave.

During use, this micro-vibration sensor vertical (or having certain pitch angle) is fixed on the vibrating object, no matter object produces the vibration of which direction, spherical free movable oscillator 4 can both carry out the movable or vibration of freedom on the damping film, and vibration signal is passed to microphone sound film 3 by damping film 5, in order to changing the internal driving of electret microphone 6, and draw corresponding switching signal, reach the purpose of vibration survey from going out stitch 7.

Claims

1, a kind of micro-vibration sensor, receive converting unit by hermetically sealed screening can, the vibration of electret microphone formula, the stitch that goes out that oscillator links to each other with hermetically sealed screening can is formed, of the present utility model being characterised in that: above electret microphone, set up damping film (5), free movable spherical oscillator (4), resistance position ring (2), resistance position film (5), be attached on the electret microphone sound film (3), spacing ring (2) is fixed on the inner top of screening can (1), and free movable spherical oscillator (4) is positioned on spacing ring (2) the internal damping film (5).