CN-122006154-A - Ultrasonic transducer connecting structure, connecting method and ultrasonic physiotherapy equipment

CN122006154ACN 122006154 ACN122006154 ACN 122006154ACN-122006154-A

Abstract

The invention relates to an ultrasonic transducer connecting structure, an ultrasonic transducer connecting method and ultrasonic physiotherapy equipment, and belongs to the technical field of physiotherapy equipment. The piezoelectric ceramic element adopts a rigid mechanical bolting structure to replace the traditional gluing mode, and a uniform axial pretightening force is applied to the piezoelectric ceramic element through the matching of a bolt and a metal gasket, so that the negative electrode surface of the piezoelectric ceramic element is in direct contact with the smooth bottom surface of the inner side of the metal shell. The invention eliminates the performance attenuation risk caused by glue layer aging, ensures the synchronism and stability of vibration energy transmission through uniform rigid coupling, thereby effectively inhibiting sound field distortion and local hot spots and remarkably improving the long-term reliability and sound field uniformity of connection.

Inventors

CHANG QIN
CHENG PEIFENG
WEI HAIZHOU
JIANG WEIZHONG
MA ZHENCHAO
YANG XINGHANG

Assignees

无锡怡声微纳医疗科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. An ultrasonic transducer connection structure, comprising: a metal shell (100) having a smooth bottom surface perpendicular to the axial direction on the inner side thereof; A piezoelectric ceramic element (200), wherein the piezoelectric ceramic element (200) has a positive electrode surface, a negative electrode surface, and an electrode coating layer connected to the positive and negative electrode surfaces, and the negative electrode surface is disposed toward the smooth bottom surface of the metal case (100); the connecting assembly is configured to apply an axial pre-tightening force to the positive electrode surface of the piezoelectric ceramic element (200) in uniform spatial distribution, and force the negative electrode surface of the piezoelectric ceramic element (200) to form direct contact with the smooth bottom surface of the metal shell (100) through the pre-tightening force.
2. The ultrasonic transducer connection structure of claim 1, wherein the connection assembly comprises: a metal pad (300) having a lower surface in direct contact with the positive electrode surface of the piezoelectric ceramic element (200); a pre-tightening bolt (600) and an insulating bush (400) sleeved on the pre-tightening bolt (600); The pre-tightening bolt (600) sequentially penetrates through the metal gasket (300) and the insulating bush (400) and is in threaded connection with the metal shell (100) so as to generate the axial pre-tightening force by screwing the pre-tightening bolt (600), and the insulating bush (400) is used for electrically isolating the pre-tightening bolt (600) from the metal gasket (300) and the piezoelectric ceramic element (200).
3. The ultrasonic transducer connection structure according to claim 2, wherein the metal housing (100) includes a housing base (110) and a boss (120) extending axially from an inside of the housing base (110), and the tip of the pretension bolt (600) is screwed with the boss (120).
4. The ultrasonic transducer connection structure according to claim 2, wherein a contact area between the lower surface of the metal pad (300) and the piezoelectric ceramic element (200) is configured to cover an active area of the positive electrode surface of the piezoelectric ceramic element (200).
5. The ultrasonic transducer connection structure of claim 1, wherein the magnitude of the axial preload force is configured to be a minimum value sufficient to eliminate a gap between a negative electrode face of the piezoelectric ceramic element (200) and a smooth bottom face of the metal housing (100), and a maximum value less than a compressive strength of the piezoelectric ceramic element (200) to maintain a long-term stable direct contact state under rated operating conditions of the device.
6. The ultrasonic transducer connection of claim 5, wherein the minimum axial preload force is such that the desired interface pressure is achieved by eliminating the gap at the contact interface and achieving efficient transmission of acoustic energy The method comprises the following steps: Wherein, the Is the equivalent elastic modulus of the contact material; Is the surface integrated unevenness; is the feature contact size.
7. An ultrasound transducer connection method, wherein the ultrasound transducer connection structure according to any one of claims 1 to 6 is applied, the method comprising: Placing a negative face of the piezoelectric ceramic element (200) toward a smooth bottom face of the metal case (100); Installing the connection assembly; By operating the connecting assembly, an axial pretightening force which is uniformly distributed in space is applied to the positive electrode surface of the piezoelectric ceramic element (200), so that the negative electrode surface of the piezoelectric ceramic element (200) is forced to be in direct contact with the smooth bottom surface of the metal shell (100).
8. The ultrasonic transducer connection method of claim 7, wherein the connection assembly comprises a metal gasket (300), a pretension bolt (600) and an insulating bushing (400); The process of installing the connecting component comprises the steps of placing the metal gasket (300) on the positive electrode surface of the piezoelectric ceramic element (200), enabling the pre-tightening bolt (600) to sequentially penetrate through the metal gasket (300) and the insulating bush (400) sleeved on the metal gasket and then be in threaded connection with the metal shell (100); The axial pre-tightening force is applied by screwing the pre-tightening bolt (600) to a set torque to generate the axial pre-tightening force.
9. The ultrasonic transducer connection method of claim 8, wherein the set torque is configured such that the generated axial preload force ranges between 0.5kN and 2.0 kN.
10. An ultrasound physiotherapy apparatus comprising an ultrasound transducer connection structure according to any one of claims 1 to 6.

Description

Ultrasonic transducer connecting structure, connecting method and ultrasonic physiotherapy equipment Technical Field The invention relates to the technical field of physiotherapy equipment, in particular to an ultrasonic transducer connecting structure, an ultrasonic transducer connecting method and ultrasonic physiotherapy equipment. Background With the development of physiotherapy equipment technology, an ultrasonic physiotherapy equipment using a piezoelectric ceramic element as a vibration generating means has appeared, which can realize efficient electromechanical conversion, generating ultrasonic waves for therapy. In order to fix the piezoelectric ceramic element on the metal casing of the physiotherapy head and realize electrical connection, conductive adhesive is generally adopted in the related art, and the piezoelectric ceramic element is adhered to the inner side of the casing through the conductive adhesive in a glue bonding mode. However, the above-mentioned conductive adhesive bonding method has inherent drawbacks in terms of reliability and acoustic performance: In reliability, the adhesive is easy to age, creep, fatigue and even decompose under the action of long-term mechanical vibration and working temperature rise, so that the bonding strength and the electrical property are gradually degraded, failure risks exist, the service life of equipment is shortened, and potential safety hazards are possibly introduced; In terms of acoustic performance, the adhesive layer is easy to generate uneven thickness and stress distribution in the curing and service processes, and is used as a non-uniform viscoelastic medium, so that a vibration energy transmission path can be distorted, mechanical coupling between the piezoelectric ceramic element and the shell is not uniform in space and unstable in time, the coupling state can cause phase distortion of a radiation wave front, random interference is generated in an acoustic near field (Fresnel zone), a local focus with high concentration of energy is formed, and subcutaneous tissue of a patient is burnt or stabbed, so that treatment experience and safety are seriously affected. Disclosure of Invention Aiming at the defects in the prior art, the inventor provides an ultrasonic transducer connecting structure, an ultrasonic transducer connecting method and ultrasonic physiotherapy equipment, so that the problems of low connection reliability, easy attenuation of performance and near-field sound field distortion caused by uneven coupling in a traditional gluing mode are solved, and the service life, the treatment safety and the comfort of a product are comprehensively improved. The technical scheme adopted by the invention is as follows: An ultrasonic transducer connection structure comprising: a metal shell, the inner side of which is provided with a smooth bottom surface perpendicular to the axial direction; The piezoelectric ceramic element is provided with a positive electrode surface, a negative electrode surface and an electrode coating connected with the positive electrode surface and the negative electrode surface, and the negative electrode surface is arranged towards the smooth bottom surface of the metal shell; The connecting assembly is configured to apply an axial pretightening force which is uniformly distributed on the positive electrode surface of the piezoelectric ceramic element, and the positive electrode surface of the piezoelectric ceramic element is forced to form direct contact with the smooth bottom surface of the metal shell by the pretightening force. As a further improvement of the above technical scheme: In one embodiment, the connecting assembly comprises a metal gasket, a pre-tightening bolt and an insulating bushing sleeved on the pre-tightening bolt, wherein the lower surface of the metal gasket is in direct contact with the positive electrode surface of the piezoelectric ceramic element; The pre-tightening bolt sequentially penetrates through the metal gasket and the insulating bush and is in threaded connection with the metal shell so as to generate the axial pre-tightening force by screwing the pre-tightening bolt, and the insulating bush is used for electrically isolating the pre-tightening bolt from the metal gasket and the piezoelectric ceramic element. In one embodiment, the metal shell comprises a shell base body and a protruding part extending from the inside of the shell base body in a lateral axial direction, and the tail end of the pre-tightening bolt is in threaded connection with the protruding part. In one embodiment, the contact area between the lower surface of the metal pad and the piezoceramic element is configured to cover the active area of the positive face of the piezoceramic element. In one embodiment, the magnitude of the axial preload force is configured to be a minimum value sufficient to eliminate a gap between the negative face of the piezoelectric ceramic element and the smooth bottom face of th