阅读说明：本技术 一种用于声波发射的膜片预应力调节装置 (Diaphragm prestress adjusting device for sound wave emission ) 是由 张家田 张庆彬 李周利 于 2021-08-30 设计创作，主要内容包括：一种用于声波发射的可调预应力膜片装置,包括相互连接的固定法兰及膜片法兰,膜片法兰内设有膜片,磁致伸缩换能器底端分别穿过基座、磁致伸缩换能器垫片、弹簧、磁致伸缩换能器支撑架及橡胶垫正中,与膜片顶部相连接；通过调节第一螺丝旋进来调节膜片因形变而产生的应力,膜片产生的应力就是对膜片施加的预应力,磁致伸缩换能器的换能器节点法兰处为变幅杆节点,通电后,当磁致伸缩换能器发生共振时,此处无振动,可防止第一螺丝因高频振动而脱落；弹簧可进一步吸收共振的能量,避免壳体共振所造成的结构损坏,安全性较高,具有预应力足够大且可调、结构简单、效果好及加工方便的优点。(An adjustable prestressed diaphragm device for sound wave emission comprises a fixed flange and a diaphragm flange which are connected with each other, a diaphragm is arranged in the diaphragm flange, and the bottom end of a magnetostrictive transducer respectively penetrates through the centers of a base, a magnetostrictive transducer gasket, a spring, a magnetostrictive transducer support frame and a rubber pad and is connected with the top of the diaphragm; the stress generated by the diaphragm due to deformation is adjusted by adjusting the screwing of the first screw, the stress generated by the diaphragm is prestress applied to the diaphragm, a node flange of a transducer of the magnetostrictive transducer is an amplitude transformer node, and after the magnetostrictive transducer is electrified, when the magnetostrictive transducer resonates, the magnetostrictive transducer does not vibrate at the node flange, so that the first screw can be prevented from falling off due to high-frequency vibration; the spring can further absorb the energy of resonance, avoids the structural damage caused by the resonance of the shell, has higher safety, and has the advantages of large and adjustable prestress, simple structure, good effect and convenient processing.)

1. A diaphragm prestress adjusting device for sound wave emission comprises a fixed flange (1) and a diaphragm flange (2) which are connected with each other, wherein a rubber ring (6) is arranged between the fixed flange (1) and the diaphragm flange (2); the method is characterized in that: a magnetostrictive transducer support frame (1-1) is arranged at the top of the fixed flange (1), the top of the magnetostrictive transducer support frame (1-1) is connected with the base (3), and a first screw (8-1) sequentially connects a node flange (7-1) of the magnetostrictive transducer (7), a magnetostrictive transducer gasket (4), a spring (5) and the magnetostrictive transducer support frame (1-1); the bottom end of the magnetostrictive transducer (7) penetrates through the centers of the base (3), the magnetostrictive transducer gasket (4), the spring (5), the magnetostrictive transducer support frame (1-1) and the rubber ring (6) respectively and is connected with the top of the diaphragm (2-1) in the diaphragm flange (2).

2. A diaphragm pre-stress adjustment device for acoustic wave transmission according to claim 1, wherein: the magnetostrictive transducer gasket (4) and the spring (5) are arranged in the base (3).

3. A diaphragm pre-stress adjustment device for acoustic wave transmission according to claim 1, wherein: the first screw (8-1) is a countersunk head screw.

4. A diaphragm pre-stress adjustment device for acoustic wave transmission according to claim 1, wherein: a closed cavity (10) is formed between the fixed flange (1) and the diaphragm flange (2), and a medium is filled in the cavity (10).

5. A diaphragm pre-stress adjustment device for acoustic wave transmission according to claim 4, wherein: the filling medium of the cavity (10) is air.

6. A diaphragm pre-stress adjustment device for acoustic wave transmission according to claim 1, wherein: the outer diameter of the transducer node flange (7-1) is smaller than that of the transducer gasket (4), and the outer diameters of the transducer gasket (4) and the spring (5) are smaller than the inner diameter of the base (3).

Technical Field

The invention relates to a diaphragm prestress adjusting device, in particular to a diaphragm prestress adjusting device for sound wave emission.

Background

The piston type sound source is a planar vibrator which drives a radiation interface element (BEM) to do reciprocating motion through a driving mechanism to radiate sound waves, and the core of the piston type sound source is that a diaphragm vibrates in a reciprocating mode to generate the sound waves. The diaphragm is a rigid material, the pressure increment applied to the diaphragm is in direct proportion to the deformation of the diaphragm within a certain deformation range, and in an actual sound production product, a certain prestress needs to be applied to the diaphragm to deform the diaphragm to a range in which the pressure increment is in direct proportion to the deformation of the diaphragm, so that the radiated sound wave is not distorted. It follows that the pre-stress of the diaphragm is critical to the degree of distortion of the sound generating device. In the process of applying prestress to the membrane, the prestress device is ensured not to cause structural damage to the membrane or the prestress is ensured not to influence the vibration of the driving mechanism as far as possible. In addition, the different thicknesses of the membranes required by different products and the processing errors of the membranes can cause different pre-stresses required by each membrane, and the pre-stress is required to be adjustable. Therefore, the design of the diaphragm prestress adjusting device which can adjust the diaphragm prestress and does not influence the original driving structure and the diaphragm structure is very important for the sound production device.

The currently used membrane prestress adjusting device is a cavity oil pressure pressurizing device, namely, oil pressure with certain pressure intensity is filled into a sealed cavity, and prestress is exerted by the pressure of the oil pressure on a membrane. The problems of the scheme are that the pressure which can be filled in the cavity is limited, the range of the prestress which can be applied is small, the cavity is difficult to seal along with the rise of the oil pressure, the service life is long, or the pressure relief problem exists when the diaphragm vibrates at high frequency, and the pressure needs to be maintained regularly.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a diaphragm prestress adjusting device for sound wave emission, which can apply the maximum prestress far greater than the pressure in a cavity, and can prevent a bolt from loosening caused by mechanical resonance because the prestress applying interface is positioned at the node of an amplitude transformer under the condition of mechanical resonance, and can effectively avoid the defects that the range of the prestress applied by oil pressure is small, the cavity is difficult to seal and the pressure needs to be maintained regularly; in addition, the prestress required by the diaphragm is adjusted through the tightness of the countersunk head screw; has the advantages of adjustable prestress, simple structure, good effect and convenient processing.

In order to achieve the purpose, the invention adopts the technical scheme that:

a diaphragm prestress adjusting device for sound wave emission comprises a fixed flange 1 and a diaphragm flange 2 which are connected with each other, wherein a rubber ring 6 is arranged between the fixed flange 1 and the diaphragm flange 2; the top of the fixed flange 1 is provided with a magnetostrictive transducer support frame 1-1, the top of the magnetostrictive transducer support frame 1-1 is connected with the base 3, a first screw 8-1 sequentially connects a node flange 7-1 of the magnetostrictive transducer 7, a magnetostrictive transducer gasket 4, a spring 5 and the magnetostrictive transducer support frame 1-1, and the bottom end of the magnetostrictive transducer 7 respectively penetrates through the centers of the base 3, the magnetostrictive transducer gasket 4, the spring 5, the magnetostrictive transducer support frame 1-1 and the rubber ring 6 to be connected with the top of the diaphragm 2-1 in the diaphragm flange 2.

The magnetostrictive transducer gasket 4 and the spring 5 are arranged in the base 3.

The first screw 8-1 is a countersunk head screw.

And a closed cavity 10 is formed between the fixed flange 1 and the diaphragm flange 2, and the cavity 10 is filled with a medium.

The filling medium of the cavity 10 is air.

The outer diameter of the transducer node flange 7-1 is smaller than the outer diameter of the transducer gasket 4, and the outer diameters of the transducer gasket 4 and the spring 5 are smaller than the inner diameter of the base 3.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the first screw 8-1 is used for applying prestress to the diaphragm 2-1, so that the vibration of the magnetostrictive transducer 6 is not influenced in the working process, and the original structure of the diaphragm 2-1 is not influenced.

2. In the invention, the transducer node flange 7-1 of the magnetostrictive transducer 7 is a horn node, and after electrification, when the magnetostrictive transducer 7 resonates, the node has no vibration, so that the first screw 8-1 can be prevented from falling off due to high-frequency vibration.

3. In the invention, the spring 5 can further absorb the energy of resonance, thereby avoiding the structural damage caused by the resonance of the shell and having higher safety.

4. The invention can adjust the prestress of the diaphragm 2-1 by adjusting the tightness and looseness of the countersunk head screw 8-1, and is rapid, convenient and accurate.

5. The membrane prestress adjusting device can apply the maximum prestress which is far larger than the pressure in the cavity.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Fig. 2 is a front view of the fixing flange 1 of the present invention.

Fig. 3 is a front view of the diaphragm flange 2 of the present invention.

Fig. 4 is a front view of the base 3 of the present invention.

Fig. 5 is a front view of the transducer pad 4 of the present invention.

Fig. 6 is a front view of the spring 5 of the present invention.

In the figure: 1. a fixed flange; 1-1, a magnetostrictive transducer support frame; 2. a diaphragm flange; 2-1, a membrane; 2-2, external threads; 3. a base; 4. a magnetostrictive transducer spacer; 5. a spring; 6. a rubber ring; 7. a magnetostrictive transducer; 7-1, node flanges; 8-1, a first screw; 8-2, a second screw; 9. fastening a bolt; 10. a cavity.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1 to 6, a diaphragm prestress adjusting device for acoustic wave emission includes a fixing flange 1 and a diaphragm flange 2 connected by fastening bolts 9, the top of the fixed flange 1 is provided with a magnetostrictive transducer support frame 1-1, the top of the magnetostrictive transducer support frame 1-1 is connected with the base 3 through a second screw 8-2, the first screw 8-1 sequentially connects a node flange 7-1 of a magnetostrictive transducer 7, a magnetostrictive transducer gasket 4, a spring 5 and the magnetostrictive transducer support frame 1-1, the bottom end of the magnetostrictive transducer 7 respectively passes through the center of the base 3, the magnetostrictive transducer gasket 4, the spring 5, the magnetostrictive transducer support frame 1-1 and a rubber pad 6, is in threaded connection with the external thread 2-2 at the top of the membrane 2-1 in the membrane flange 2.

The magnetostrictive transducer gasket 4 and the spring 5 are arranged in the base 3.

The rubber ring 6 is arranged between the fixed flange 1 and the diaphragm flange 2.

The first screw 8-1 and the second screw 8-2 are countersunk screws.

And a closed cavity 10 is formed between the fixed flange 1 and the diaphragm flange 2, and the cavity 10 is filled with a medium.

The filling medium of the cavity 10 is air.

The outer diameter of the transducer node flange 7-1 is smaller than the outer diameter of the transducer gasket 4, and the outer diameters of the transducer gasket 4 and the spring 5 are smaller than the inner diameter of the base 3.

The prestress application precision can be adjusted by adjusting the pitch of the first screw 8-1, and the smaller the pitch is, the higher the axial prestress adjustment precision is; the axial prestress obtained when the diaphragm is screwed in for one circle by adopting LY12 as the diaphragm material and the screw pitches are respectively set to be 0.5 (fine teeth) and 0.7 (coarse teeth) and the axial prestress obtained by the currently adopted mode of providing the axial prestress for the diaphragm by the pressure of 1MPa, 5MPa and 10MPa in the cavity are compared as shown in the following table:

the comparison shows that the invention is more suitable for the large axial prestress diaphragm device and can apply the maximum axial prestress far greater than the pressure in the cavity. The above table shows that if the countersunk head screw 4-1 with the specification of M4x0.5-25 GB/T823-2016 is adopted to screw and buckle, the generated axial prestress can replace the axial prestress generated by 36.55MPa pressure in the cavity.

The working principle of the invention is as follows:

firstly, after a rubber ring 6 is filled between a diaphragm flange 2 and a fixed flange 1, the diaphragm flange and the fixed flange are connected and fastened by a fastening bolt 9, a base 3 and the fixed flange 1 are connected by a countersunk head screw 8-2, a spring 5 and an energy converter gasket 3 are sequentially filled in the base 3, a magnetostrictive energy converter 7 sequentially passes through an energy converter gasket central hole 4-1, the spring 5, a base central hole 3-1 and a magnetostrictive energy converter support frame 2-1 and is connected with an external thread 2-1, and a first screw 8-1 is used for connecting and screwing an energy converter node flange 7-1, an energy converter gasket 4, the base 3 and the fixed flange 2 to a proper position.

When the acoustic wave transmitting device works, the magnetostrictive transducer 6 is driven by an external driving board to generate displacement change (Joule effect), and the displacement change of the magnetostrictive transducer 6 drives the diaphragm to displace and change, so that acoustic waves are transmitted.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention should be defined by the claims.