CN2149609Y - Gas medium ultrasonic energy-exchanger - Google Patents

Abstract

The utility model discloses a gas medium ultrasonic energy-exchanger used for exchanging sound and electricity when the position of an obstacle is measured in a non-connecting type, comprising a flaring radiation screen, and a vibrating circular disk at a small mouth end and a combination vibrator are connected into integration. The utility model is characterized in that the combination vibrator with a horn is provided, a resonant cavity body used for exciting the vibrating circular disk to strongly vibrate is adjustable, and the work efficiency of the total transducer is improved.

Description

Gas medium ultrasonic energy-exchanger

The utility model relates to the sonac that uses in a kind of contactless obstacle, the level gauging instrument, more particularly is a kind of transducer that electric ┈ sound can be changed mutually.

In industrial and agricultural production, often need measure relevant barrier, flow, liquid level, material level etc., contactless obstacle, level gauging then are very good measuring methods.In existing measuring technique, generally adopt nothing more than being the flexural vibrations transducers, utilize it to transmit and receive ultrasound wave, owing to multiple reason, its measurement range is subjected to bigger restriction.The Patent Gazette for Utility Models that Patent Office of the People's Republic of China publishes discloses the application case (notification number CN2108907U) that a kind of name is called " the ultrasonic material level gauge of aerosphere type " on July 1st, 1992, the improvement structure that disclosed aerosphere type sonac is exactly a kind of flexural vibrations sensor in its patent application specification, its technical solution is that the front shroud (7) of radiation disk (6) screw-in compound bar extensional vibration sensor is gone up and tightened, between radiation disk (6) and the front shroud (7) one section air resonance chamber (4) is arranged, vibration isolation rubber (3) is enclosed within on radiation disk (6) and the front shroud (7), and loudspeaker (5) are inserted in vibration isolation rubber (3).This utility model has improved the electric ┈ sound conversion efficiency of sensor to a certain extent, thereby measurement range is also increased.Because in the utility model, front shroud (7) is the identical cylindricality of diameter, the amplitude of its transmitting vibrations is limited; Radiation disk (6) directly is fixed as one with front shroud (7), vibration isolation rubber (3), loudspeaker (5), therefore, the vibration mode of under this boundary condition, carrying out, damping is bigger in its vibration processes; In addition, the cavity of resonator cavity also is that this that fix is unfavorable for regulating transducer and is operated in optimum condition.

The purpose of this utility model is to improve the work boundary condition of the vibrating disk in the gas medium ultrasonic transducer, and then improves the work efficiency of transducer.

To achieve these goals, the technical solution that the utility model adopts is: the gas medium ultrasonic transducer, it has a flaring radiation shield (1), the vibrating disk that has compensated loop (5) (6) that is positioned at its osculum end combines as a whole with composite oscillator, this composite oscillator is to be formed with piezoelectric chip (10) and the vertical sequential combination of back of the body piece (11) by the luffing vibrating arm that the bar that carefully shakes (8) of different-diameter and the bar (9) that slightly shakes constitute, it is positioned at tail pipe (4) inside, its technical scheme special feature is exactly, transducer also has a back of the body pipe (3), one end of back of the body pipe (3) and the osculum end of radiation shield (1) link, one end of the other end and tail pipe (4) links, vibrating disk (6) is fixing by outstanding of the bar that carefully shakes (8) that links with it, this vibrating disk (6) is managed formation one resonator cavity (7) between the backboard set in (3) with a side and the back of the body that the bar (8) that carefully shakes links, this resonator cavity (7) will promote vibrating disk (6) and do the high-order flexural vibrations, the cavity of this resonator cavity (7) is adjustable, it is tubaeform radiation shield (1), between the backboard that is provided with in vibrating disk (6) and the back of the body pipe (3) apart from scalable, so that vibrating disk (6) is operated in best select location.

The utility model compared with prior art has substantive distinguishing features and progress, and this is mainly reflected in following aspect:

1. in the composite oscillator in the utility model technical solution a luffing vibrating arm is arranged, make amplitude amplify, promote vibrating disk (6) and do the high-order flexural vibrations through the meticulous bar that shakes (8);

2. the bar that carefully shakes (8) of vibrating disk (6) and composite oscillator links and is one, and is being fixed by outstanding propping up, and under this boundary condition, the damping that vibration is subjected to is less, makes its work efficiency raising;

3. the cavity of resonator cavity (7) can be regulated, and calculates selected theoretical position on the basis in theory, only needs fine setting can make vibrating disk (6) be operated in optimum condition.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model.

Mark among the figure: (1) radiation shield; (2) cover seat; (3) back of the body pipe; (4) tail pipe; (5) compensated loop; (6) vibrating disk; (7) resonator cavity; (8) bar that carefully shakes; (9) bar that slightly shakes; (10) piezoelectric chip; (11) back of the body piece; (12) vibration isolation cover.

Below in conjunction with drawings and Examples the utility model is done further to describe in detail.

Referring to accompanying drawing 1, the card that is positioned at radiation shield (1) one side of vibrating disk (6) is provided with a phase compensation ring (5), and it is nonmetal parts and pastes with disk body and to be one, utilizes this compensated loop (5) to come the correction signal phase place.The luffing vibrating arm is by the bar that carefully shakes (8) and slightly shake bar (9) and constitute, composite oscillator is to be combined by luffing vibrating arm, piezoelectric chip (10) and back of the body piece (11), be nested with a vibration isolation cover (12) on it, this vibration isolation cover (12) is made by nonmetallic materials, it is socketed in the position at piezoelectric chip (10) place, and by this vibration isolation cover (12) with the composite oscillator relative fixed in tail pipe (4).By accompanying drawing 1 pipe (3) of can passing away is that body by large and small two kinds of diameters constitutes, the middle part also is provided with the backboard of band circular hole in the pipe, the diameter of this circular hole is greater than the diameter of the bar that carefully shakes (8), the bar (8) that carefully shakes passes this circular hole non-contactly, bar (8) unsettled the passing from this circular hole of promptly carefully shaking, by this mode vibration, its damping is less.In addition, two pipe end outsides of the large and small diameter of back of the body pipe (3) also are respectively equipped with one section external thread, go up set screw-internal thread fit in order to the cover seat (2) on the same radiation shield (1), tail pipe (4) and connect, also reach the working position of being convenient to regulate the cavity of resonator cavity (7) and adjusting vibrating disk (6) by this threaded connection mode just.In the utility model, for the ease of making and install and making vibrating disk (6) that a desirable border condition of work be arranged, special with vibrating disk (6) with carefully shake bar (8) both be made as one, the end of the bar that carefully shakes (8) is connected by the set threaded engagement in the set screw thread and the termination of the bar that slightly shakes (9).

The utility model is when doing emission work, piezoelectric chip (10) is by the alternating voltage in addition that goes between at two ends, when the alternating voltage frequency is the composite oscillator resonant frequency, composite oscillator produces judder, its amplitude is done the high-order flexural vibrations through the bar that carefully shakes (8) the amplification back promotion vibrating disk (6) of luffing vibrating arm, when vibrating disk (6) vibrates, its amplitude further strengthens, in gas medium, give off ultrasound wave, simultaneously, the vibrating disk (6) that is positioned at flaring radiation shield (1) throat utilizes this radiation shield (1) big, the different openings of osculum end further reduces the radiation acoustic resistance, has improved the work efficiency of transducer greatly.

When the work of reception, by the ultrasound wave that transmits in the gas medium, amplify the back was received and caused it and composite oscillator by vibrating disk (6) vibration through radiation shield (1), and change vibration the alternating voltage of frequency unanimity into again by lead-in wire output by piezoelectric chip (10).

Claims (5)

1, a kind of gas medium ultrasonic transducer, it comprises a flaring radiation shield (1), the vibrating disk that has compensated loop (5) (6) that is positioned at its osculum end combines as a whole with composite oscillator, described composite oscillator is to be formed with piezoelectric chip (10) and the vertical sequential combination of back of the body piece (11) by the luffing vibrating arm that the bar that carefully shakes (8) of different-diameter and the bar (9) that slightly shakes constitute, it is positioned at tail pipe (4) inside, it is characterized in that: an end of back of the body pipe (3) and the osculum end of radiation shield (1) link, and an end of the other end and tail pipe (4) links; Vibrating disk (6) is fixing by outstanding of the bar that carefully shakes (8) that links with it, and this vibrating disk (6) and the back of the body are managed and formed the adjustable resonator cavity of a cavity (7) between the backboard set in (3).

2, gas medium ultrasonic transducer according to claim 1 is characterized in that: embed vibration isolation cover (12) in the tail pipe (4) be enclosed within on the composite oscillator and with its fixation in tail pipe (4).

3, gas medium ultrasonic transducer according to claim 1, it is characterized in that: above-mentioned back of the body pipe (3) is to be made of large and small two kinds of diameter bodys, the middle part is provided with the backboard that the center has set circular hole in the pipe, and the diameter of the described bar (8) that carefully shakes is less than this circular hole and therefrom unsettled passing.

4, according to claim 1 or 3 described gas medium ultrasonic transducers, it is characterized in that: the body end of the large and small diameter of described back of the body pipe (3) is equipped with the radiation shield (1) of cover seat (2) respectively with afterbody osculum end, tail pipe (4) passes through thread connection.

5, according to claim 1 or 3 described gas medium ultrasonic transducers, it is characterized in that: described vibrating disk (6) with carefully shake bar (8) both are one, the end of the bar that carefully shakes (8) is connected with the set threaded engagement in termination of the bar that slightly shakes (9) by set screw thread.