CN201403196Y - Underwater loudspeaker - Google Patents
Underwater loudspeaker Download PDFInfo
- Publication number
- CN201403196Y CN201403196Y CN2009200685569U CN200920068556U CN201403196Y CN 201403196 Y CN201403196 Y CN 201403196Y CN 2009200685569 U CN2009200685569 U CN 2009200685569U CN 200920068556 U CN200920068556 U CN 200920068556U CN 201403196 Y CN201403196 Y CN 201403196Y
- Authority
- CN
- China
- Prior art keywords
- giant magnetostrictive
- magnetostrictive rod
- cavity
- housing
- acoustic impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
A underwater loudspeaker comprises a casing, a giant magnetostrictive rod, a coil bracket, two pre-bias magnetic permanent magnets and an acoustic impedance matched elements, wherein the casing is spherical, the coil bracket is provided with a cavity of which the axes is in horizontal direction, the two ends of the coil bracket are propped against the inner wall of the casing, an excitation coil is enwound on the outer surface of the coil bracket, the giant magnetostrictive rod is arranged in the cavity in a penetrating manner, and the axis of the giant magnetostrictive rod coincides with theaxis of the cavity; the two pre-bias magnetic permanent magnets are respectively arranged at the end part of the cavity of the coil bracket and propped against the end surface of the giant magnetostrictive rod; both the acoustic impedance matched elements are positioned between the giant magnetostrictive rod and the pre-bias magnetic permanent magnets. When the giant magnetostrictive rod providedby the utility model vibrates, relative moving cannot occur among the casing, the giant magnetostrictive rod, the coil bracket, the pre-bias magnetic permanent magnets and the acoustic impedance matched elements, and the vibration energy of the giant magnetostrictive rod spreads through elastic deformation of the interior of each element. Therefore, the electromechanical conversion rate is high.
Description
Technical field
The utility model relates to a kind of loud speaker, relates in particular to a kind of pallesthesiometer.
Background technology
Chinese patent is announced No. 2872775 and has been announced a kind of pallesthesiometer, and this loud speaker comprises housing and causes the telescopic drive device.Described housing is that the radiant panel of class ellipse or class semiellipse arc is formed by an axial cross section, and super-magnetostrictive drive is positioned at housing, and its axis overlaps with the major axis of radiant panel, radiant panel and driver two axial ends directly or indirect contact constitute phonation board.
The operation principle of above-mentioned loud speaker is: when driver during along its axial vibration, when the radiant panel long axis of ellipse deforms, opposite distortion along short-axis direction then takes place (when major axis extends in radiant panel minor axis part, then shorten) along minor axis, thereby, on short-axis direction, obtain the mechanical energy output that vibrational energy has been amplified.
But the expansion and contraction of giant magnetostrictive material has only at most about 2/1000ths, that is to say the absolute elongation amount that will obtain 0.2 millimeter, and the giant magnetostrictive material length of employing must be greater than 100 millimeters.The giant magnetostrictive material of 10 millimeters long if the designer has adopted, he can only obtain maximum 0.02 millimeter absolute elongation amount so, this numerical value has been in the same order of magnitude with the elastic deformation of material surface, housing can not have been regarded as and " rigid body " in this case, that is to say, the elongation of giant magnetostrictive material only can " push up a hole " on inner walls, be not enough to cause that other parts make complete response.Motion resembles our bean curd that press...withed one's finger, can only below finger, cause a hole partly, and other parts of bean curd may not be certain associated movement, even if also can not be standard ground motion (can not accurately reproduce the action that you push).Therefore, it is poor that Chinese patent is announced the electromechanical conversion efficiency of the 2872775th disclosed loud speaker.
Summary of the invention
The purpose of this utility model is to provide a kind of pallesthesiometer, this loud speaker electromechanical conversion efficiency height at the defective that background technology exists.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of pallesthesiometer comprises housing, giant magnetostrictive rod, coil brace, two pre-magnetic bias permanent magnet harmony impedance matching elements.Housing is spherical in shape.Coil brace has the cavity that an axis is a horizontal direction, and the two ends of coil brace are against the inwall of housing, and the coil brace outer surface twines magnet exciting coil, and described giant magnetostrictive rod is arranged in the cavity, the axis of giant magnetostrictive rod and the dead in line of cavity.Two pre-magnetic bias permanent magnets lay respectively at the end of coil brace cavity and against the end face of giant magnetostrictive rod.The acoustic impedance matching element lays respectively between giant magnetostrictive rod and the pre-magnetic bias permanent magnet.
Further, described housing is an oblate spheroid.
In addition, acoustic impedance matching element described in the utility model also is arranged between described pre-magnetic bias permanent magnet and the housing.
The beneficial effects of the utility model:
The utility model is because the axis of giant magnetostrictive rod is positioned at horizontal direction, and giant magnetostrictive rod, housing, coil brace, two pre-magnetic bias permanent magnet harmony impedance matching elements closely against, therefore, super when causing the extension stem vibration, there be not relative moving between the described element, the energy of giant magnetostrictive rod vibration relies on the vibration propagation of each element internal, therefore, and dynamo-electric transfer ratio height.
Description of drawings
Fig. 1 is the utility model pallesthesiometer schematic diagram.
Embodiment
Further specify architectural feature of the present utility model below in conjunction with accompanying drawing.
See also Fig. 1, the utility model pallesthesiometer comprises giant magnetostrictive rod 1, housing 2, coil brace 3, two pre-magnetic bias permanent magnet 4 harmony impedance matching elements 5.Housing 2 is spherical.Coil brace 3 has the cavity 31 that an axis is a horizontal direction, and its outer surface twines magnet exciting coil 32, and the two ends of coil brace 3 are against the inwall of housing 2.Giant magnetostrictive rod 1 is arranged in the cavity 31 of coil brace 3, the dead in line of the axis of giant magnetostrictive rod 1 and cavity 31.Two pre-magnetic bias permanent magnets 4 lay respectively at the end of cavity 31 and near the end face that causes extension stem 1.Acoustic impedance matching element 5 lays respectively between giant magnetostrictive rod 1 and the permanent magnet 4.
As improvement, housing 2 is an oblate spheroid, makes that the pallesthesiometer anti-pressure ability is strong, and is sturdy and durable.
Described acoustic impedance matching element 5 also is arranged between described pre-magnetic bias permanent magnet 4 and the housing 2.
The utility model in use, because the two ends of giant magnetostrictive rod 1 are provided with pre-magnetic bias permanent magnet 4 harmony impedance matching elements 5, the inwall of acoustic impedance matching element 5 contact housings 2, therefore, under the effect in magnetic field, along acoustic impedance matching element 5, the orientation of pre-magnetic bias permanent magnet 4 and housing 2, giant magnetostrictive rod 1 follows the variation in magnetic field to neglect the long weak point of neglecting, simultaneously to acoustic impedance matching element 5, pre-magnetic bias permanent magnet 4 and housing 2 inwalls apply effect, and, the barycenter of giant magnetostrictive rod 1 does not move, acoustic impedance matching element 5, do not relatively move between pre-magnetic bias permanent magnet 4 and the housing 2 yet, energy relies on acoustic impedance matching element 5, the inner separately elastic deformation of pre-magnetic bias permanent magnet 4 and housing 2 is propagated, thereby, dynamo-electric conversion ratio height.
Claims (3)
1. pallesthesiometer comprises housing and giant magnetostrictive rod, and housing is spherical in shape, it is characterized in that, also comprises:
Coil brace has the cavity that an axis is a horizontal direction, and the two ends of coil brace are against the inwall of housing, and the coil brace outer surface twines magnet exciting coil, and described giant magnetostrictive rod is arranged in the cavity, the axis of giant magnetostrictive rod and the dead in line of cavity;
Two pre-magnetic bias permanent magnets lay respectively at the end of coil brace cavity and against the end face of giant magnetostrictive rod;
The acoustic impedance matching element lays respectively between giant magnetostrictive rod and the pre-magnetic bias permanent magnet.
2. pallesthesiometer as claimed in claim 1 is characterized in that, described housing is an oblate spheroid.
3. pallesthesiometer as claimed in claim 1 is characterized in that, described acoustic impedance matching element also is arranged between described pre-magnetic bias permanent magnet and the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200685569U CN201403196Y (en) | 2009-03-06 | 2009-03-06 | Underwater loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200685569U CN201403196Y (en) | 2009-03-06 | 2009-03-06 | Underwater loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201403196Y true CN201403196Y (en) | 2010-02-10 |
Family
ID=41662995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200685569U Expired - Fee Related CN201403196Y (en) | 2009-03-06 | 2009-03-06 | Underwater loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201403196Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285449A (en) * | 2018-12-06 | 2020-06-16 | 宁波方太厨具有限公司 | Electromagnetic water treatment device and water heater comprising same |
-
2009
- 2009-03-06 CN CN2009200685569U patent/CN201403196Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285449A (en) * | 2018-12-06 | 2020-06-16 | 宁波方太厨具有限公司 | Electromagnetic water treatment device and water heater comprising same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20100306 |