CN1392380A - Multi-stage thermoacoustic compressor - Google Patents

Abstract

The multi-stage thermoacoustic compressor has a first resonant tube as well as cooler, silk net, heater and the first-stage air bank connected successively to two ends of the first resonant tube. There are diffuser, cooler, silk heater, heat buffer, subsidiary cooler and a second resonant tube connected successively and perpendicularly to the first resonant tube. There are acoustic capacito, water cooler and load connected successively and perpendicularly to the second resonant tube. The present invention has multi-stage cascade amplification mode to lower the amplification requirement of each stage and this facilitates the utilization of low-grade heat energy.

Description

Multi-stage thermoacoustic compressor

The present invention relates to a kind of multi-stage thermoacoustic compressor.

Heat sound machinery does not have moving component, does not need slipper seal, does not have the mechanical part that needs close tolerance and lubricating oil yet.Working fluid is the mixture of helium or helium and other inert gases, does not consume the ozone in the atmosphere, also can not cause greenhouse effects.The valuable point of heat sound machinery also is to adopt low-grade energy heat energy (as solar energy, combustion gas, exhaust steam etc.) to drive, and has great flexibility, and those occasions that lack electric energy are then had more practical significance.Yet, in heat sound machinery, because the restriction of heater and regenerator (heat sound plate is folded) material thermal resistance energy and wall are to the leakage warm of environment, the maximum heating temperature of heater and heating power are limiting the acting ability of single-stage heat sound machinery, become the obstacle that strengthens the thermoacoustic compressor performance.

The purpose of this invention is to provide and a kind ofly can reduce the amplification requirement folded, thereby reduce requirement, the multi-stage thermoacoustic compressor that facilitates for the utilization of low grade heat energy each grade heating-up temperature to veneer.

In order to achieve the above object, the present invention takes following measures:

Plant multi-stage thermoacoustic compressor and have first resonatron, two ends are connected to cooler, silk screen, heater, one-level air reservoir respectively successively, vertically be provided with diffuser pipe, cooler, silk screen, heater, thermal buffer, supplementary cooler, second resonatron at first resonatron successively near cooler one side, vertically be provided with acoustic capacitance, water cooler, load successively near supplementary cooler one end at second resonatron.

The multistage amplifying method that the present invention proposes has avoided because the restriction of the leakage heat of plate overlay environment and material thermal resistance energy.The temperature difference that causes setting up at the folded two ends of the single level plates of certain-length is limited, so that the amplifying power of veneer overlay sound merit is restricted.By adopting the folded mode of amplifying step by step of multi-stage board, under the condition that requires certain output sound merit, can reduce the amplification requirement folded, thereby reduce requirement, for the utilization of low grade heat energy facilitates to each grade heating-up temperature to veneer.

Below in conjunction with accompanying drawing the present invention is elaborated.

Fig. 1 is a single-stage thermoacoustic compressor structural representation;

Fig. 2 is a secondary thermoacoustic compressor structural representation.

Multi-stage thermoacoustic compressor has first resonatron 5, two ends are connected to cooler 4, silk screen 3, heater 2, one-level air reservoir 1 respectively successively, vertically be provided with diffuser pipe 7, cooler 8, silk screen 9, heater 10, thermal buffer 11, supplementary cooler 12, second resonatron 13 at first resonatron successively near cooler one side, vertically be provided with acoustic capacitance 14, water cooler 15, load 6 successively near supplementary cooler one end at second resonatron.

The present invention adopts the multi-stage thermoacoustic method that contracts to substitute single level machine and drives load (vascular refrigerator), to fold under the limited temperature difference and heating-up temperature at single plate, adopting a plurality of plates to fold is further amplified sound wave, be prevalent in the little and big inadequately deficiency of amplitude of pressure ratio in the heat sound machinery thereby remedied, satisfy the job requirement of load (vascular etc.).

The sound merit expression formula of amplifying is ${\stackrel{\·}{W}}_2=\frac{1}{4}\mathrm{\Π}{\mathrm{\δ}}_k\mathrm{\Δx}\frac{T_m{\mathrm{\β}}^2\mathrm{\ω}}{{\mathrm{\ρ}}_m{C}_p}{\left(p_1^s\right)}^2(\mathrm{\Γ}-1),$ Γ in the formula= T _m/ T _CritFor plate on folded the actual temperature gradient and the ratio of critical-temperature gradient. T _mBig more, Γ is big more, output work

Also big more.But in fact, the single plate T on folded _mCan not be very big, because maximum heating temperature and heating power are subjected to the restriction of material and structure high temperature high voltage resistant mechanical performance thereof, in order to avoid cause problems such as security and reliability.On the other hand, the cooling medium of cooler is general all with the cooling water under the room temperature, so the temperature of the folded cold junction of plate can not be lower than room temperature.Adding the folded surperficial leakage heat to environment of plate will increase along with the rising of heating-up temperature, also determine the limit of the folded two ends of plate temperature differences.Therefore, the acting ability of single-stage thermoacoustic compressor and efficient all are limited.And secondary is so that multi-stage thermoacoustic compressor can improve the output work of thermoacoustic compressor and the utilization ratio of heat by the amplification layer by layer of a plurality of plate overlay sound merits.

We investigate the multiplication factor of silk screen plate overlay sound merit.It is all less that gas in the heat sound machinery vibrates general amplitude, and the folded size of plate is much smaller than wavelength, can think the average pressure p of plate in folded _mNecessarily, so ρ is arranged _mT _m=const, wherein ρ _m, T _mDisplay plate is folded the averag density and the mean temperature in cross section respectively.Because the gap that plate is folded is very little, can ignore the existence of acoustic capacitance.According to mass conservation law, ρ is arranged _mU ₁=const, wherein U ₁Be volume flow rate, so have $\frac{T_h}{T_c}=\frac{U_{l,h}}{U_{l,c}},$ Subscript h, c be folded hot junction and the cold junction of display plate respectively.If $\frac{T_h}{T_c}=\mathrm{\&tau;}>1,$ Promptly $\frac{U_{l,h}}{U_{l,c}}>.$ Because the folded size of plate is more much smaller than wavelength, can be similar to and thinks the average pressure p at the folded two ends of plate _mNecessarily, p just _{1, h}=p _{1, c}, the definition of its substitution sound merit $\stackrel{\&CenterDot;}{W}=\frac{1}{2}\mathrm{Re}\left[p_1\stackrel{\&OverBar;}{{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">U</figure-callout>}}_1}\right]=\frac{1}{2}\mathrm{Re}\left[\stackrel{\&OverBar;}{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">p</figure-callout>}}_1}{U}_1\right]=\frac{1}{2}\left|{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">p</figure-callout>}}_1\right|\left|{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">p</figure-callout>}}_1\right|\left|{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">U</figure-callout>}}_1\right|\cos {\mathrm{\&phi;}}_{\mathrm{pU}}$ In ${\stackrel{\&CenterDot;}{W}}_h=\mathrm{\&tau;}{\stackrel{\&CenterDot;}{W}}_c.$ Have for the single-stage thermoacoustic compressor ${\stackrel{\&CenterDot;}{W}}_h={\mathrm{\&tau;}}_1{\stackrel{\&CenterDot;}{W}}_c,$ The secondary machine has ${\stackrel{\&CenterDot;}{W}}_h={\mathrm{\&tau;}}_1{\mathrm{\&tau;}}_2{\stackrel{\&CenterDot;}{W}}_c,$ τ ₁Temperature difference ratio on expression first order silk screen plate is folded, τ ₂Temperature difference ratio on expression second level silk screen plate is folded is in the formula ${\mathrm{\&tau;}}_2=\frac{T_{h2}}{{\mathrm{<figure-callout\; id="2"\; label="T\; c"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">T</figure-callout>}}_c}>1,$ So the big multiple of theoretical sound power amplifier $\mathrm{\&eta;}=\frac{W_2}{{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A0112222800061.png"\; state="\{\{state\}\}">W</figure-callout>}}_1}=\frac{{\mathrm{\&tau;}}_1{\mathrm{\&tau;}}_2}{{\mathrm{\&tau;}}_1}={\mathrm{\&tau;}}_2.$ Therefore, the sound merit through multistage amplification is obviously big than the sound merit of directly drawing from one-level.

Claims (1)

1. multi-stage thermoacoustic compressor, it is characterized in that it has first resonatron [5], two ends are connected to cooler [4], silk screen [3], heater [2], one-level air reservoir [1] respectively successively, vertically be provided with diffuser pipe [7], cooler [8], silk screen [9], heater [10], thermal buffer [11], supplementary cooler [12], second resonatron [13] at first resonatron successively near cooler one side, vertically be provided with acoustic capacitance [14], water cooler [15], load [6] successively near supplementary cooler one end at second resonatron.

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