CN2289614Y

CN2289614Y - Ultrasonic transducer

Info

Publication number: CN2289614Y
Application number: CN 97201560
Authority: CN
Inventors: 孟明华
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-02-27
Filing date: 1997-02-27
Publication date: 1998-09-02
Anticipated expiration: 2007-02-27

Abstract

The utility model relates to an ultrasonic transducer, a plurality of piezoelectric wafers 2 and electrode plates 4 are clamped between an upper base 1 and a lower base 5, and the piezoelectric wafers 2 and the electrode plates 4 are provided with a common central axis. The upper base 1 is a cylinder, the center is provided with an axially through hole, the center of the lower base 5 is also provided with an axially through hole, and the thread holes 51 are distributed from the middle part to the bottom. A bolt 7 penetrates the from top to bottom so as to tightly press the wafers 2 and the electrode plates 4, the contact surfaces of each wafer 2 and the electrode plate 4 are provided with adhesive material layers 3, and the adhesive material layers are usually epoxy resin thin layers. The utility model has reliable work, long service life and hard being damaged, and the cost is equal to the existing technical products.

Description

Ultrasonic transducer

The utility model relates to electric solid state device, particularly relates to electrostriction ultrasonic transduction device.

The modern plastics electroplating equipment wielding machine is extensive use of the mechanical oscillation of ultrasonic transduction device generation more than 20 kilo hertzs, and it is passed to plumb joint with the sweating heat thermoplastic plastic.The transducer that is used for this purpose mostly is the electrostriction type, to use lead zirconate titanate (PZT) piezoelectric chip.Power transformation circuit is transformed to extremely several kilowatts superaudio electric power of hundreds of with 50 hertz of civil powers, and resonance potential reaches two or three kilovolt, and it is put on the described ultrasonic transduction device, can obtain the compressional wave mechanical oscillation of same frequency.

Prior art is used for the ultrasonic transducer of Plastic Welding, often comprise nearly four lead zirconate titanate crystal, as shown in Figure 1, each wafer 2 is round pie, middle porose, serve as a contrast within it with insulating sleeve 6 ' after, with Allen bolt 7 ' the pass through seat of honour 1 ' be through at again wherein, bolt 7 ' bottom screw in following 5 ', with described each wafer clamping.Because following 5 ' screwed hole of centre 51 ' do not connect, its limited length, so have only the ridge of limited quantity stressed after each wafer 2 clamping, structure like this is often found described screwed hole 51 ' cunning tooth or bolt 7 ' fracture after working after a while.And because large power supersonic vibration, each wafer is bump so that cracked mutually, makes described transducer damage and can't work.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and ultrasonic transducer that a kind of improvement is provided, utilize this transducer to cooperate amplifier and plumb joint welding plastic goods, reliable operation, the internal thread of following seat 5 is not easy sliding tooth, bolt 7 can not fracture yet, although nearly four of piezoelectric crystals 2 can not clash into mutually and cracked.

The purpose of this utility model can be by realizing by the following technical solutions: design and produce a kind of ultrasonic transducer, comprise the seat of honour, each piezoelectric chip, following and sleeve pipe and bolt.Each wafer and each contact electrode sheet are clipped between the seat of honour and following, have common central axis.The described seat of honour is a cylinder, and there is axial pass-through holes at the center.Also there is axial pass-through holes at a described following center, and its epimere is a straight hole, down until the bottom all is the smaller screwed hole in aperture.Bolt screws in down from top to bottom in the seat and runs through described transducer, and its upper end also screws in the end face that nut is pressed on the seat of honour, makes each piezoelectric chip and each electrode slice be clamped between the seat of honour and following, and the sticky matter layer is arranged on the contact-making surface of each wafer and electrode slice.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the structure sketch of prior art ultrasonic transducer;

Fig. 2 is the semi-section assembly drawing of the utility model ultrasonic transducer;

Fig. 3 is the perspective view of following 5 of described transducer.

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:

As shown in Figure 2, the utility model ultrasonic transducer comprises the seat of honour 1, multi-disc lead zirconate titanate piezoelectric wafer 2, following 5 and sleeve pipe 6 and bolt 7.Each wafer 2 and each contact electrode sheet 4 are alternate repeatedly to be put, and is clipped between the seat of honour 1 and following 5, has common central axis.The described seat of honour 1 is a cylinder, and there is axial pass-through holes at the center.Also there is axial pass-through holes at described following 5 centers, and its epimere 53 is a straight hole, down until bottom 55 all is the smaller screwed hole in aperture 51.Bolt 7 screws in following 5 from top to bottom and runs through described transducer, and its upper end also screws in the end face that nut 8 is pressed on the seat of honour 1, makes each piezoelectric chip 2 and each electrode slice 4 be clamped between the seat of honour 1 and following 5.On the contact-making surface of each wafer 2 and electrode slice 4 sticky matter layer 3 is arranged, common this sticky matter layer 3 is epoxy resin thin layers, but also can use other toughness bonding agent preferably.Sticky matter layer 3 has been filled up each wafer 2 and the slight void between the electrodes in contact sheet 4 with it, discharge heating phenomenon when having avoided work, and since wafer 2 and electrode slice 4 tightly stick together, vibration bump and slide displacement are also unlikely, thereby generate heat when further reducing work and avoid wafer cracked.

Described sleeve pipe 6 usefulness insulating material are made, and are placed in the last stage casing of bolt 7.Each piezoelectric chip 2 same polarity is relative, draws through electrode slice 4, and the negative pole of each wafer 2 also contacts with following 5 with the seat of honour 1 respectively, with it equipotential.Electrode slice 4 generally strikes out with the fine copper plate, and two of same polarity connect with flexible conductor.Bolt 7 is with the seat of honour 1 and following 5 equipotentials, and sleeve pipe 6 is isolated with each piezoelectric chip 2 it from current potential.Described following 5, see Fig. 3, major part is a cylinder, and only epimere fraction 52 diameters are bigger, and its axial center hole 53 diameters are also big than lower thread hole 51, form horn-like opening up, and are drilled with a plurality of axial heat radiation apertures 54 at periphery.All make with aluminium alloy with following 5 at the seat of honour 1.The seat of honour 1 also claims briquetting, can make of harder steel in some occasion.

Compare with prior art, ultrasonic transducer reliable operation of the present utility model, the life-span is permanent, does not allow Fragile, cost is also higher unlike prior art products.

Claims

1. ultrasonic transducer, comprise the seat of honour (1), each piezoelectric chip (2), following (5), and sleeve pipe (6) and bolt (7), each wafer (2) and each contact electrode sheet (4) are clipped between the seat of honour (1) and following (5), has common central axis, it is characterized in that: the described seat of honour (1) is cylinder, and there is axial pass-through holes at the center; Also there is axial pass-through holes at described following (5) center, and its epimere (53) is a straight hole, down until bottom (55) all is the smaller screwed hole in aperture (51); Bolt (7) screws in following (5) from top to bottom and runs through described transducer, its upper end also screws in the end face that nut (8) is pressed on the seat of honour (1), make each piezoelectric chip (2) and each electrode slice (4) be clamped between the seat of honour (1) and following (5), on the contact-making surface of each wafer (2) and electrode slice (4) sticky matter layer (3) is arranged.

2. according to the described ultrasonic transducer of claim 1, it is characterized in that: described sticky matter layer (3) is the epoxy resin thin layer.

3. according to the described ultrasonic transducer of claim 1, it is characterized in that: described bolt (7) has all cut screw thread in the gamut of its length.

4. according to the described ultrasonic transducer of claim 1, it is characterized in that: all make with aluminium alloy the described seat of honour (1) and following (5).