CN1331553A - Hydraulic piston type sound enclosure - Google Patents

Abstract

A hydraulic piston type sound enclosure features that the hydraulic pistons are installed to enclosed sound enclosure to make the volume and damping of sound enclosure change with the vibration of bass loudspeaker. The said sound enclosure made up of solid, gas and liquid is composed of loudspeaker chamber and piston chamber with semi-transparent rubber piston tubes, liquid pistons, copper jointers of pistons and clamper of rubber tubers.

Description

Hydraulic piston type sound enclosure

The technology of the present invention is possessed and control in the method for designing of audio amplifier and structural scheme.

At present, the audio amplifier design is complicated, the specification requirement height, and structure is made up of gas and solid.Gas is exactly air; Solid comprises: casing, loud speaker, frequency divider or the like.These audio amplifiers are difficult to all accomplish that volume is little, the situation that tonequality is good again.

In the last deficiency that has in the technology, purpose of the present invention just provide a kind of specification requirement low, the design easy, textural adding liquid, make the casing volume little, the speaker production scheme that tonequality is good again.

The audibility range of people's ear is lower limit 20Hz-upper limit 20KHz, and playback high pitch 20KHz can both accomplish in audio amplifier, as long as high pitch loudspeaker can reach 20KHz.For playback bass 20Hz, be exactly the purpose that we make audio amplifier.Decision audio amplifier bass effect quality has two; One is static parameter---lower frequency limit, another be dynamic parameter---instant response is when the design audio amplifier.We wish that lower frequency limit is low more good more.And for instant response, then hope reaches situation shown in Fig. 1-1, at this moment the quality factor of audio amplifier: Q=0.707 is the optimal damping state, and these two parameters play a decisive role to audio amplifier, is the key point of cabinet design.Below our their cross correlations, airtight audio amplifier is calculated by following formula: $f_{\mathrm{oc}}=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="f\; o"\; filenames="A0011926600062.png"\; state="\{\{state\}\}">f</figure-callout>}}_o^{}+\frac{355a^4}{m_{o}v}}$

Wherein: f _OcIt is lower frequency limit

f _oIt is the woofer resonance frequency

m _oIt is the woofer oscillating mass

A is that woofer effectively vibrates radius

V is the net volume of audio amplifier

As can be seen from the above equation, f _OcBe by four parameter decisions, still, after we select loud speaker brand and model, f _o, m _oAll decide with these three parameters of a, the designer is powerless, and only remaining casing net volume v can be definite by the designer, by following formula as can be known, and v and f _Oc ²Be certain inversely prroportional relationship, v is big more, f _OcLow more, but excessive casing can cause the transient response variation, shown in Fig. 1-2, casing can not be too small, and too small volume can make audio amplifier be in degree of depth underdamping state as Figure 1-3.So these two parameters of lower frequency limit and instant response check and balance, the design of traditional audio amplifier is exactly to take all factors into consideration aspect two at this, makes the quality factor q of audio amplifier _Oc=0.707

The hydraulic piston type sound enclosure theory is thought: Q _Oc=0.707 damping state also is not best, and the woofer system is fully played.Also have a kind of state---the free volume conditions of free damping.It can make more lower limit of bass effect, and sensitivity is higher, and tank-volumes is littler, can excavate the loud speaker potentiality to greatest extent.

This audio amplifier invention normal structure principle as shown in Figure 2, audio amplifier is divided into A chamber and B chamber, A is the woofer installation room, and the B chamber is a piston chamber, wherein 1 translucent rubber pipe, 2 liquid water pistons, 3 copper pipe piston joints, 4 rubber tube chucks, B piston chamber is made up of four pistons, be attached to the back side of casing, piston is to connect the audio amplifier volume by rubber tube one end with copper pipe, curves middle low arc, and the centre adds liquid---water, make audio amplifier volume of air and isolate from outer air, water plays piston action, can make the volume of A chamber vibrate the free adjustment tank-volumes with woofer, and woofer is loaded, increase the woofer oscillating mass, make the audio amplifier lower-frequency limit.Carry out the loudspeaker vibration soft landing, improve audio amplifier sensitivity, transient distortion is eliminated resonance or the like.The effect of piston chamber is to be finished jointly by rubber tube expansion, deflation and water piston side-to-side movement.It is to be directly proportional with woofer amplitude size that piston chamber loads size, and when amplitude was big, water piston raise, and water quality is heavy more, and water loads just heavy, and lower frequency limit is low more, and bass effect is just good more.

This audio amplifier invention technical requirement on design is: casing is airtight, woofer and high Squawker will separate airtightly, and the casing size principle is loud speaker to be installed down just, and the box sizes ratio not can be integral multiple, in order to avoid sound coloration.Four piston tube swept volumes at audio amplifier rated power amplitude volume, that is: are effectively vibrated area * amplitude distance=amplitude volume greater than woofer, record after audio amplifier is carried out and are generally several millimeters.1.2-1.8 centimetres of rubber tube diameters all can, the piston water yield is the smaller the better, is convenient to activity, plays obturation effect just.After audio amplifier was carried out, scalable rubber tube radian or piston liquid measure, rubber tube diameter changed sensitivity, bass effect.

Now, two important parameters of our this audio amplifier invention:

Static parameter---lower frequency limit.In woofer when work, drive that air vibration rubber tube wall swollenly contracts, the water piston side-to-side movement, like this, can regard woofer as and drive water piston, just increases the loudspeaker vibration quality.Learn that by above-mentioned formula oscillating mass and lower frequency limit are inversely proportional, so the further lower limit of frequency.

Dynamic parameter-response in a flash.Come temporarily as a twinkling signal, the load of A chamber is added on woofer, and piston chamber has a moment to lag behind, situation as shown in Figure 3 can appear in its transient state, wherein a is the optimal damping response curve, and b is the long-pending damping response curve of transfiguration, because piston chamber's lagging reasons, only there is the A room air to act on woofer, at this moment, audio amplifier is in underdamping state, b response curve slope maximum among Fig. 3, expression vibrating diaphragm vibration velocity is the fastest, at t ₁After time, because piston chamber acts on the woofer vibrating diaphragm rapidly, audio amplifier returns to normal damping state rapidly, the slope of curve descends gradually, the expression vibrating diaphragm descends gradually, and returns to normal damping speed, and the conditions of streaking of end is effectively suppressed because the curve that the action diagram 1-3 of piston chamber is seen descends not, carry out the soft return of vibrating diaphragm, illustrate that like this transient state improves.

Following advantage and good effect have been compared in the invention of this audio amplifier with prior art.

(1) first Application liquid of the present invention (water) is done the piston of audio amplifier, thereby makes the variable volume of audio amplifier, and damping is variable.Change traditional audio amplifier method for designing: traditional audio amplifier is to be made of gas and solid.Using liquid of the present invention also changes traditional formation scheme.Thereby, sound is made enter a new field, new notion.

(2) the present invention and tradition are relatively: have simplicity of design, specification requirement is not high, and volume is little, and is cheap.

(3) the present invention and prior art are relatively: the playback sound field is broad, low-frequency sensitive degree height, and parsing power is good, effectively reduces the loud speaker amplitude, can not produce standing wave in the case, effectively avoids acoustic short circuit and mutual interference.Excavate the loud speaker potentiality as far as possible.

Fig. 4 is an audio amplifier experiment product structure of the present invention, bass Zhujiang River board YD-300mm 80W, and middle pitch flies happy board YDQZ20-4 40W, high pitch sounds of nature board TL10-10S 15W, good news board tri-frequency divider L-380, crossover frequency is 900HZ, 5000HZ.The casing net volume is about 50 liters, the piston rubber tube is with therapeutic medical diameter 12mm, the long 260mm of each sebific duct, each long approximately 10mm of the piston water yield, short more good more, the about 70mm of joint copper pipe curves 90 degree at the 1Cmm place, casing is with the highly dense plate of thick 18mm, glue is pasted, tighten up with wooden Luo silk every 50mm,, paste the thick sponge of 20mm again with five faces in pitch pouring casing the inside, do not block piston hole, in order to avoid air-flow is not smooth, during installation panel, seal with glazing compound, tighten up with wooden Luo silk, solidify glue with AB at last, sealed copper joint and casing connect around place, place and the loud speaker and around the terminal box, are strictly on guard against gas leakage.Symmetry is wanted in the piston perforate, i.e. two holes, the left side, and two holes, the right make bass loudhailer acoustic pressure balance, want clamping on the symmetrical limit in hole, well the fixing radian of rubber tube.

(4-1) is that positive (4-2) is back view for side sectional view (4-3) in Fig. 4

Wherein: 1. high pitch installing hole 2. middle pitch installing holes 3. bass installing holes

4. sponge 5. pitch pitches 6. terminal box holes

7. piston hole 8. copper pipe joints 9. rubber tubes

10. the fixing clip of water piston 11.

This experiment audio amplifier rated power 100W, during audition, with power 100W amplifier, bass is heavy, not messy, audio amplifier sheet material does not resonate, can obviously see water piston the motion, piston water is outwelled, it is impure bass to occur, and hard, and sheet material has vibratory sensation.

Claims (3)

1. a method for designing and structural scheme that the audio amplifier field is used, its method for designing are, the piston chamber that uses rubber tube and water to constitute in airtight audio amplifier makes audio amplifier volume, audio amplifier damping, changes with the vibration of bass loudhailer.Piston chamber's swept volume equals woofer rated power vibrating diaphragm vibration volume in audio amplifier.Change number of pistons, the piston water yield, rubber tube diameter, the horizontal radian of rubber tube, the woofer bass effect is preferably got final product.

2. according to right 1 described audio amplifier, its structural scheme is to utilize soft piston tube to expand, dwindle with piston side-to-side movement and regulates audio amplifier volume, audio amplifier damping, makes the bass loudhailer always be in the soft landing state.Increase number of pistons, reduce the piston liquid measure, reduce the piston tube radian and enlarge the piston tube diameter, the sound damping is reduced, sensitivity increases, and variable volume increases, otherwise on the contrary then.

3. according to right 1 and right 2 described audio amplifiers, the application of liquid piston chamber on sound equipment changes traditional audio amplifier by gas and solid-state construction, becomes gas, liquid, solid-state construction.Method for designing also becomes simplification by tradition is complicated.

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