KR101016218B1 - Thermo Acoustic Generation Apparatus and Method Changing Frequency and Method for Controlling the Inner-Position do Thermoacoustic using the Apparatus - Google Patents

Abstract

The present invention provides a thermoacoustic generation method using a thermoacoustic generator with a variable frequency and a thermoacoustic generator with a variable frequency and a length and length of the thermoacoustic generator to obtain a maximum sound output in the thermoacoustic generator with a variable frequency. A method for easily adjusting the position of the thermoacoustic exchanger inside the apparatus. In more detail, a thermoacoustic generator, comprising: a high-temperature portion in the form of a hollow tube having an open portion having an inner space and an open portion at one side thereof; Heating means coupled to the open portion of the hot portion to heat the gas in the inner space of the hot portion; A low temperature part of a tubular shape having an inner space and both sides of which are open and one side of which has a thermoacoustic generator for generating sound; Cooling means for cooling the gas of the inner space of the low temperature portion on the open side of the low temperature portion; And a thermoacoustic exchanger that connects the open portion of the hot portion to the open side of the cold portion and includes a plurality of capillaries, and allows a gas to circulate between the inner space of the hot portion and the inner space of the cold portion. It is a thermoacoustic generator capable of variable frequency to generate a sound having a specific frequency by converting.

Thermoacoustic exchanger, SUS capillary, internal space length, specific frequency, maximum sound output, temperature difference, high temperature part, low temperature part

Description

Thermoacoustic generator capable of variable frequency and method of generating thermoacoustics using the apparatus and adjusting the internal position of the thermoacoustic exchanger for maximum sound output {Thermo Acoustic Generation Apparatus and Method Changing Frequency and Method for Controlling the Inner-Position do Thermoacoustic using the Apparatus}

The present invention uses a thermoacoustic generator with a variable frequency and a thermoacoustic generator with a variable frequency to obtain a maximum acoustic output in a thermoacoustic method and a thermoacoustic generator with a variable frequency. It is about how to easily adjust the position of the thermoacoustic exchanger inside the light device. Since the specific frequency of the thermoacoustic output in more detail is inversely proportional to the length of the thermoacoustic generator, a thermoacoustic generator and a thermoacoustic method capable of changing the frequency are provided with an adjusting means for adjusting the length.

Then, there is a specific length of the thermoacoustic generator that gives the maximum sound output to the method of adjusting the length of the low-temperature section internal space that can have a maximum sound output for the length of the high-temperature section inner space determined or the length of the determined low-temperature section inner space It is about a method of adjusting the length of the internal space of the high temperature section that can have a maximum sound output for.

A device for generating sound using a common moving coil may generate sound by generating mechanical energy due to vibration. However, in the sound generating technology using moving parts such as moving coils, the temperature increases due to frictional heat when used for a long time, and the sound wave generation efficiency is often lowered or malfunctions.

In addition, the sound generating apparatus using the moving coil method is difficult to generate a strong sound wave of a certain limit due to the weight of the diaphragm supporting the moving coil. Another method for generating sound is a piezoelectric material method, which is mainly used to generate an ultrasonic band because the vibration displacement is smaller than that of the moving coil method, and thus it is not used in low frequency audible sound band.

The thermoacoustic generator using the thermoacoustic generation technology can output more powerful sound because the thermal energy is converted into a mechanical energy sound without using mechanical moving parts. However, since the thermoacoustic generator is generated by resonating sound waves in the internal space of the thermoacoustic generator, there is a problem that the frequency cannot be changed when the length of the apparatus is fixed.

In addition, the conventional thermoacoustic generator has a disadvantage in that the production of a thermoacoustic exchanger that converts thermal energy into mechanical energy, which is mechanical energy, is complicated. Therefore, in order to solve this problem, a thermoacoustic exchanger composed of a plurality of SUS (stainless steel) capillaries is adopted, and the heat of which the frequency can be changed by varying the length of the inner space of the hot part and the length of the inner space of the cold part is changed. A sound generator was required.

Accordingly, the present invention provides a thermoacoustic generator capable of varying a frequency by allowing the length of the thermoacoustic generator to be changed to solve the above problems. In addition, the present invention provides a thermoacoustic generation method capable of varying the frequency using the thermoacoustic generator.

The thermoacoustic exchanger provided in the thermoacoustic generator of the present invention is composed of a SUS capillary tube to overcome the disadvantage that the manufacturing of the thermoacoustic exchanger is complicated because of excellent workability and performance and heat resistance. In addition, the length of the inner space of the high temperature portion can be adjusted by the length adjusting means to change the frequency, the length of the low temperature portion inner space can be changed by combining and combining the low temperature portion of the tubular shape having the length of the various inner spaces. .

In addition, the present invention provides a method of controlling the length of the inner space of the high temperature part and the length of the inner space of the low temperature part that give the maximum sound output. The position of the thermoacoustic exchanger in the thermoacoustic generator may be controlled to have a maximum sound output because there is a length of a specific high temperature inner space having a maximum sound output with respect to the determined length of the inner space of the low temperature section.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

An object of the present invention as described above, in the thermoacoustic generator, a high temperature portion of the hollow tube shape having an inner space and one side is open and the other side is closed with a closed portion; Heating means coupled to the open portion of the hot portion to heat the gas in the inner space of the hot portion; A low temperature part of a tubular shape having an inner space and both sides of which are open and one side of which has an acoustic generator for generating sound; Cooling means for cooling the gas in the inner space of the low temperature portion on the opposite side of the sound generating portion of the low temperature portion; And a thermoacoustic exchanger that connects the open portion of the high temperature portion coupled to the heating means and the open side of the low temperature portion coupled to the cooling means, and includes a plurality of capillaries, and allows a gas to exchange the high temperature portion internal space and the low temperature portion internal space. It can be achieved with a thermoacoustic generator capable of variable frequency to convert the thermal energy into mechanical energy, including a sound to generate a sound having a specific frequency.

The capillary may be characterized in that the SUS capillary.

The specific frequency of the sound generated by the sound generator may vary in inverse proportion to the length of the thermoacoustic generator, which is the sum of the length of the inner space of the high temperature part, the length of the thermoacoustic exchanger, and the length of the inner space of the low temperature part.

When the specific frequency is in the range of more than 2500 hertz to less than 20000 hertz, the change of the length of the inner space of the hot part has a greater influence on the change of the specific frequency than the change of the length of the inner space of the low temperature part, and the specific frequency exceeds 0 hertz. In the case of the region of less than 2500 Hertz, the change in the length of the inner space of the low temperature portion may be more influenced by the specific frequency change than the change of the length of the inner space of the high temperature portion.

The gas of the low temperature part is cooled and compressed by the cooling means, and the gas of the high temperature part is heated and expanded by the heating means, and circulates through the capillary of the thermoacoustic exchanger to convert thermal energy into sound.

The high temperature unit may include a length adjusting means to adjust a specific frequency of sound generated from the heat acoustic generator by adjusting the length of the internal space of the high temperature unit including the gas circulated by the heat acoustic exchanger.

A plurality of low temperature parts may be provided, and each low temperature part may include a coupling means to combine or separate the low temperature parts to adjust a length of the internal space of the low temperature part so as to change a specific frequency of sound generated by the thermoacoustic generator. have.

The heating means is provided in the opening of the high temperature portion and corresponds to the heater, the heater includes a tungsten heater that is powered by a power supply and heated and a power control means for controlling the power connected to the power supply. You can do

The cooling means corresponds to a water-cooling device, wherein the water-cooling device cools the gas inside the capillary while the flow rate supplied from the flow rate supply part flows to the exterior of the capillary tube and discharges the flow rate to the flow rate discharge part.

The output magnitude of the sound output from the thermoacoustic generator may be proportional to the temperature difference between the low temperature part and the high temperature part.

It may be characterized by the presence of a specific temperature difference that starts to generate sound at the length of the fixed thermoacoustic generator.

When the length of the sound exchanger and the length of the inner space of the low temperature section are fixed, there may be a length of the inner space of the high temperature section to have the maximum output size.

When the length of the thermoacoustic exchanger and the length of the internal space of the high temperature section are fixed, the length of the internal space of the low temperature section to have the maximum output size may be present.

In another category, an object of the present invention is to adjust the length of a thermoacoustic generator, wherein the length of the thermoacoustic exchanger is fixed, and a combination of a plurality of tubular low temperature portions having various lengths of inner space is used for Determining a length; inserting a gas into an inner space of the high temperature portion and the low temperature portion; Forming a temperature difference between the heating means and the cooling means between the high temperature portion and the low temperature portion; If the temperature difference exceeds a specific value, the gas is circulated by the thermoacoustic exchanger to output sound; And adjusting the length of the high temperature part internal space for outputting the maximum sound output by the length adjusting means according to the determined length of the low temperature part internal space. It can be achieved by the length adjustment method.

In addition, in the method for determining the length of the inner space in the thermoacoustic generator, the length of the thermoacoustic exchanger is fixed, and determining by adjusting the length of the inner space of the hot portion by the length adjusting means; Determining a length of the low temperature part internal space by combining a plurality of tubular low temperature parts having a length of various internal spaces for producing a maximum sound output according to the determined length of the high temperature part internal space; Inserting a gas into an inner space of the hot part and the cold part; Determining a temperature difference between the hot portion and the cold portion with heating means and cooling means; And when the temperature difference exceeds a specific value, the gas is circulated by the thermoacoustic exchanger to output sound. The method of controlling the length of the thermoacoustic generator for maximum acoustic output may be achieved. .

The length of the inner space of the high temperature section and the length of the inner space of the low temperature section, in which the magnitude of the sound output is maximized at a fixed temperature difference, may be proportional to each other.

Still another object of the present invention is to supply a gas to the thermoacoustic generator, the gas is filled in the inner space of the capillary and the inner space of each of the plurality of capillaries provided in the hot acoustic exchanger; The power supply device supplies electric power to the tungsten heater to heat the internal space of the high temperature section by the tungsten heater, and the flow rate is supplied from the flow rate supply of the cooling means to flow in the appearance of the capillary tube to cool the capillary tube to form a temperature difference between the low temperature section and the high temperature section. Making; And generating a sound having a specific frequency in the thermoacoustic generator by circulating the inside of the low temperature portion and the inner portion of the high temperature portion through the capillary of the thermoacoustic exchanger when the temperature difference exceeds a specific value. It can be achieved by a thermoacoustic generation method capable of varying the frequency.

The capillary may be characterized in that the SUS capillary.

The specific frequency may be inversely proportional to the length of the thermoacoustic generator, which is the sum of the length of the inner space of the hot part and the length of the thermoacoustic exchanger and the length of the inner space of the low temperature part.

In the sound generation step having a specific frequency, the magnitude of the sound output is proportional to the temperature difference, and there is a minimum specific temperature difference for generating sound, and the length of the inner space of the low temperature part by combining at least one low temperature part with the coupling means of the low temperature part. Determining and adjusting the length of the inner space of the hot portion with the length adjusting means of the hot portion according to the determined length of the inner space of the low temperature portion may be further characterized.

It may be characterized by having a specific length having the maximum sound output by adjusting the length of the inner space of the hot portion and the length of the inner space of the cold portion relative to the length of the fixed thermoacoustic exchanger.

Therefore, according to one embodiment of the present invention as described above, it is possible to change the length of the thermoacoustic generator has the effect of varying the frequency. The thermoacoustic exchanger provided in the thermoacoustic generator of the present invention has an advantage that the thermoacoustic exchanger is made of SUS capillary tube and has excellent workability and performance and heat resistance. In addition, the porosity of the capillary tube compared with the conventional one has the effect of improving the performance.

 In addition, the length of the inner space of the high temperature portion may be adjusted by the length adjusting means to change the frequency, and the length of the inner space of the low temperature portion may vary by varying the length by combining and combining tubular low temperature portions having various inner space lengths. There is an effect that can generate a sound having. The length of the internal space can be adjusted by the length adjusting means of the high temperature part while the sound output is made, so that the frequency can be changed and the size of the sound output can be adjusted.

In addition, the thermoacoustic generator of the present invention may have a maximum sound output by adjusting the length of the low temperature part internal space to the length of the fixed high temperature part internal space, or by adjusting the length of the high temperature part internal space to the determined length of the low temperature part internal space. have. Therefore, it is possible to determine the length of the inner space of the high temperature part and the length of the inner temperature of the low temperature part that can achieve the maximum efficiency with the same power or energy input, so that the thermal sound can be operated under optimized conditions and the energy efficiency can be improved. Have

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations are possible without departing from the spirit and scope of the present invention. Are all within the scope of the appended claims.

(Configuration of Thermoacoustic Generator with Variable Frequency)

Hereinafter, a configuration of a thermoacoustic generator capable of variable frequency will be described with reference to the accompanying drawings. First, Figure 1a shows a cross-sectional view of a thermoacoustic generator capable of variable frequency.

As shown in FIG. 1A, the thermoacoustic generator having a variable frequency has a constant length, has an internal space, and has a hollow tube-shaped high temperature unit 100 and a tube-type low temperature unit in which both sides are open ( 500, and a thermoacoustic exchanger 300 connecting the high temperature part 100 and the low temperature part 500 and having a plurality of capillary tubes 320. In addition, the heating means 200 and the thermoacoustic exchanger 300 and the low temperature unit 500 for heating the gas filled in the internal space 110 of the high temperature portion in the portion where the high temperature unit 100 and the thermoacoustic exchanger 300 are connected to each other. The connection portion includes a cooling means 400 for cooling the gas filled in the internal space 540 of the low temperature portion 500.

The length L of the thermoacoustic generator is the length L1 of the internal space containing the gas exchanged by the thermoacoustic exchanger 300 in the high temperature section 100 and the length L2 of the thermoacoustic exchanger 300 and It is determined by the sum of the lengths L3 of the inner space 540 of the low temperature part 500. The specific frequency f of the generated sound is expressed by Equation 1.

f = 4 * c / L

Where f is the specific frequency, c is the speed of sound (about 330 m / s for air, and therefore a positive constant), and L is the length of the thermoacoustic generator. Therefore, the specific frequency f is inversely proportional to L.

The high temperature unit 100 is filled with gas in the internal space 110 and the gas is heated by the heating means 200 and the pressure is increased to move to the low temperature unit 500 through the interior of the capillary tube 320. The high temperature unit 100 has a closed portion 130 in which one side is blocked in the form of a hollow tube, and the other side is a portion to which the thermoacoustic exchanger 300 is connected to the open portion. In addition, the length L1 of the internal space 110 filling the gas exchanged through the thermoacoustic exchanger 300 to the high temperature part 100 may be adjusted by the length adjusting means 120.

As shown in FIG. Length adjusting means 120 is composed of a piston 123, a shaft 122, and a handle 121. The piston 123 distinguishes a gas that is not exchanged with a gas that can be exchanged with the thermoacoustic exchanger 300 in the internal space 110 of the high temperature portion. Accordingly, the length of the inner space 110 filling the gas exchanged by the thermoacoustic exchanger 300 by adjusting where the piston 123 is located in the inner space 110 of the high temperature part using the handle 121 ( L1) can be adjusted.

The low temperature part 500 has a form of a tube in which both sides are open. Both sides of the low temperature portion 500 has a coupling means. Thus, as shown in Figure 1a, it is coupled to the thermoacoustic exchanger 300 by a coupling means 540 provided on one side open. A specific example of the coupling means is a screw, the low temperature unit 500 is provided with a male screw and the thermoacoustic exchanger 300 is composed of a female screw can combine both. The low temperature part 500 may be formed by combining a plurality of low temperature parts 500 of the tubular shape.

As shown in FIG. 1A, the low temperature part 500 includes a first low temperature part 520 having a length L3 of an inner space 540 and a second low temperature part 530 having a length L5 of an inner space 540. It can be configured by the coupling means. Therefore, the length of the combined low temperature part 500 internal space 540 is L4 + L5 = L3. In addition, the low temperature part 500 may be composed of only the first low temperature part 520, and the length of the inner space 540 of the low temperature part 500 may be L3 = L4, or L3 = L5 consisting of only the second low temperature part 530. . The low temperature unit 500 may be configured to have various internal space lengths by combining and combining tubes having various internal space lengths.

The opposite side to which the thermoacoustic exchanger 300 is coupled in the low temperature unit 500 corresponds to the sound generator 510 in which sound is generated. The heating unit 200 is provided at a portion where the high temperature unit 100 and the thermoacoustic exchanger 300 are connected to each other. In addition, the cooling unit 400 is provided at a portion where the low temperature unit 500 and the thermoacoustic exchanger 300 are connected. Therefore, a temperature difference ΔT occurs between the high temperature part 100 and the low temperature part 500. The thermoacoustic exchanger 300 is composed of a plurality of capillaries 320, the gas moves from the high temperature portion 100 to the low temperature portion 500 through each of the capillary tubes 320, and the high temperature portion 100 at the low temperature portion 500. It moves to), exchanges and circulates, and converts thermal energy into acoustic energy, which is mechanical energy.

1B illustrates an enlarged cross-sectional view of the inside of the capillary tube 320. As shown, it can be seen that the enlarged gas grain 330 circulates by exchanging the hot portion 100 and the cold portion 500 through the capillary tube 320. Specifically, the length L2 of the thermoacoustic exchanger 300 corresponds to 5 mm to 10 cm, and the high temperature part 100 and the low temperature part 500 cooled by the cooling means 400 are heated by the heating means 200. The temperature difference (ΔT) is about 200 to 600 ° C. The capillary tube 320 used in the thermoacoustic exchanger 300 uses an iron scrubber, an SUS (stainless steel) mesh, an SUS parallel pin, a ceramic square lattice, a Kapton or an SUS capillary. However, the use of SUS capillaries, which are easy to process and excellent in heat resistance and performance, best meets the technical features of the present invention. SUS capillary tube is excellent in workability and performance and heat resistance to facilitate the production of the thermoacoustic exchanger (300). In addition, the porosity of the capillary tube 320 is high to improve performance.

As shown in Figure 1b, the gas of the high temperature portion 100 is heated to increase the temperature and expands to increase the pressure in the high temperature portion internal space 110 to move instantaneously through the capillary tube 320 to the low temperature portion 500 do. When the gas moves to the low temperature portion 500, the temperature drops and contracts. In addition, the gas of the high temperature unit 100 is momentarily moved to the low temperature unit 500 so that the pressure of the high temperature unit 100 decreases and the pressure of the low temperature unit 500 increases, so that the gas moves to the high temperature unit 100 again.

This gas exchange is continuously circulated and occurs when the high temperature portion 100 and the low temperature portion 500 become a temperature difference ΔT or more than a predetermined temperature, and at this time, thermal energy is converted into acoustic energy, which is mechanical energy. It generates a sound having a specific frequency. Figure 1c shows a graph of the temperature of the thermoacoustic generator length (L) according to the circulation, exchange of gas, Figure 1d is a graph showing the pressure for the volume along the gas circulation.

The heating means 200 provided at the portion where the high temperature unit 100 and the thermoacoustic exchanger 300 are connected corresponds to a heater in a specific embodiment. FIG. 2 is a cross-sectional view of the heater and taken along line A-A 'of FIG. 1A. As shown in FIG. 2, the electric heater is connected to the tungsten heater 210 powered by the power supply device 220, the power supply device 220, and the power supply device 220 to regulate power. It is provided with an adjusting device 230. The tungsten heater 210 supplied with power is heated to increase the temperature of the gas in the high temperature internal space 110.

3A is a cross-sectional view of the cooling means, which is taken along line B-B 'of FIG. 1A. And, Figure 3b shows a side view of the cooling means 400. As shown in Figure 3a, the cooling means 400 corresponds to the water-cooled cooling device flow rate supply unit 410 and the flow rate discharge unit 420, flow rate meter 430, flow rate regulator 440 and flow rate pump 450 It consists of). The fluid is pumped from the flow rate pump 450 so that the fluid is supplied from the flow rate supply part to flow out of the capillary tube 320. Therefore, as the capillary tube 320 is cooled, the gas in the capillary tube 320 inside 321 is cooled. After flowing outside the capillary tube 320 is discharged to the flow rate discharge portion 420. In addition, the flow rate to be supplied is measured by the flow meter 430 and the amount and temperature of the flow rate is adjusted in the flow controller 440.

The heating means 200 and the cooling means 400 make a temperature difference ΔT between the high temperature portion 100 and the low temperature portion 500 and the temperature difference ΔT corresponds to 200 to 600 ° C. The temperature difference (△ T) must exceed a certain level to generate sound. 4 is a graph showing a point in time when sound is generated when the temperature difference ΔT is formed by the heating means 200 and the cooling means 400, and a minimum temperature difference ΔT in which the sound is generated. As shown in FIG. 4, cooling and heating are started and sound is generated when the temperature difference ΔT is about 460 ° C. FIG. The point of time is about 18 minutes and the magnitude of the sound output is about 95 decibels (dB) as measured by the noise measuring device 600 at a distance of 1 meter from the sound generating unit 510.

In addition, the magnitude of the generated sound output is proportional to the temperature difference ΔT. Then, there is a length L of the thermoacoustic generator having the maximum output. 5A and 5B are graphs showing the magnitude of the sound output according to the change in the length of the internal space 540 of the low temperature part 500 according to specific temperature differences ΔT. As shown in FIG. 5A, the length L1 of the high temperature part internal space 110 and the length L2 of the thermoacoustic exchanger 300 are fixed to L1 + (L2 / 2) = 45 mm and the internal space of the low temperature part 500 is fixed. The magnitude of the sound output according to the change in the length L3 of 540 can be known. It can be seen that when L1 + (L2 / 2) = 45mm, the value of L3 with maximum output is 22mm, and when L3 is fixed, the temperature difference (△ T) is proportional to the magnitude of the sound output. It can be seen.

Also. 5B is a graph showing the magnitudes of the sound output inside and outside the thermoacoustic generator when L1 + (L2 / 2) = 70 mm and L3 is changed. In the graph, the left vertical axis is the magnitude coordinate axis of the sound inside, and the right vertical axis is the magnitude coordinate axis of the sound output outside. As shown in FIG. 5B, it can be seen that L3 has a maximum output at 35 mm. Accordingly, there is a length L3 of the specific low temperature part 500 internal space 540 having a maximum output with respect to the length L2 of the fixed thermoacoustic exchanger 300 and the length L1 of the high temperature part internal space 110. It can be seen.

The specific frequency generated is determined according to the length L of the thermoacoustic generator, and the specific frequency is inversely proportional to the length L. As described above, L and the specific frequency f have a relationship of Equation 1. 6A and 6B illustrate a length L1 of the high temperature part internal space 110 and a length L3 of the low temperature part 500 internal space 540 when the length L2 of the thermoacoustic exchanger 300 is fixed at 5 cm. Is a graph showing the change of a specific frequency (f) according to the change.

As shown in FIG. 6A, in the region where the specific frequency is more than 5000 hertz (Hz), as the L3 increases, the decrease in the specific frequency decreases, but as the L1 decreases in the region, the specific frequency increases significantly. Able to know. Therefore, in the high frequency band L1 has a greater influence on the specific frequency change than L3. FIG. 6 shows a graph of an area of 1200 hertz (Hz) or less, and it can be seen that the specific frequency is not greatly changed by the change of L1, but the specific frequency is greatly reduced as L3 is increased. Therefore, it can be seen that L3 has a greater influence on a specific frequency than L1 in the low frequency region.

 As shown in FIGS. 5A and 5B, when any one of the length L1 of the inner space 110 of the high temperature part and the length L3 of the inner space 540 of the low temperature part 500 is determined, the remainder having the maximum sound output. The length can be determined. 7 shows the relationship between L1 and L3 to have the maximum output. These satisfy the following expression (2).

L3 = 3 * L1 + L2

Here, L2 corresponds to a fixed value (positive constant) by the length of the thermoacoustic exchanger (300). It can be seen that L1 and L3 for producing the maximum sound output are proportional to each other. When L1 is determined by Equation 2, L3 for maximum acoustic output may be determined, and conversely, when L3 is determined, L1 for maximum acoustic output may be determined. Specifically, when L3 is determined to be 900 mm by combining or combining the plurality of low temperature parts 500 with the coupling means, L1 for the maximum sound output is determined to be 285 mm.

(Thermal Acoustic Generation Method Using Thermoacoustic Generator with Variable Frequency)

Hereinafter, a thermoacoustic generation method using a thermoacoustic generator capable of varying frequency will be described with reference to the accompanying drawings. First, FIG. 8 shows a flowchart of a thermoacoustic generation method using a thermoacoustic generator capable of varying frequency.

First, the gas is filled in the high temperature unit 100, the low temperature unit 500, and the capillary tube 320 inside 321 of the thermoacoustic exchanger 300 (S10). Then, power is supplied to the tungsten heater 210 from the power supply device 220 of the heater to increase the gas temperature of the internal space 110 of the high temperature part. Then, the flow rate is supplied from the flow rate supply part 410 of the cooling means 400 to cool the gas in the internal space 540 of the low temperature part 500 (S20). Therefore, the temperature difference ΔT between the high temperature part 100 and the low temperature part 500 is formed, and when the temperature difference ΔT exceeds a predetermined value, the inside of the capillary tube 320 of the thermoacoustic exchanger 300 (321). As the gas of the high temperature unit 100 and the low temperature unit 500 is exchanged through the thermal energy is converted into the acoustic energy of the mechanical energy (S30).

As described above, the capillary tube 320 is preferably using the SUS capillary tube 320, it is possible to adjust L1 and L3 to have the maximum sound output. And, if you want to change the specific frequency of the sound, it is possible to obtain the desired specific frequency by adjusting L1 and L3. The adjustment of L1 is possible by the length adjusting means 120 of the high temperature portion 100 and the adjustment of L3 may adjust the length by combining a plurality of low temperature portions 500 in the form of a tube (S40).

(How to adjust the length to get maximum sound output)

Hereinafter, a length adjusting method for obtaining a maximum sound output will be described with reference to the accompanying drawings. First, FIG. 9 shows a flowchart of the first embodiment of the length adjusting method for obtaining the maximum sound output.

First, in order to determine the length L3 of the inner space 540 of the low temperature part 500, a plurality of tubular low temperature parts 500 having various lengths of the inner space are combined and combined (S100). When the length L3 of the inner space 540 of the low temperature part 500 is determined, gas is filled in the capillary tube 320 and the inner 321 of the high temperature part 100, the low temperature part internal space 500, and the thermoacoustic exchanger 300. It becomes (S200). Then, the gas temperature of the inner space 110 of the high temperature part is increased by the heater, which is the heating means 200. In addition, the cooling means 400 cools the gas in the low-temperature part 500 internal space 540. Therefore, the temperature difference ΔT between the high temperature unit 100 and the low temperature unit 500 is formed. (S300),

When the temperature difference ΔT increases and becomes a specific abnormality, the gas of the high temperature part 100 moves to the low temperature part 500 through the interior 321 of the capillary tube 320 of the thermoacoustic exchanger 300 and the low temperature part 500. As the gas moves to the high temperature portion 100 through the interior 321 of the capillary tube 320, the gas is circulated, and thermal energy is converted into acoustic energy, which is mechanical energy, to generate sound (S400). Then, the length L1 of the high temperature part internal space 110 for producing the maximum sound output is determined using the length adjusting means 120 (S500). As described above, the length L1 of the high temperature part internal space 110 for producing the maximum sound output with respect to the length L3 of the fixed low temperature part 500 internal space 540 is represented by Equation 2.

10 shows a flowchart of a second embodiment of the length adjusting method for obtaining the maximum sound output. First, the length L1 of the fixing part internal space 110 is determined by the length adjusting means 120 of the fixing part (S1000). Then, the internal length L3 of the low temperature part 500 to have the maximum sound output according to the determined length L1 of the internal part 110 of the fixed part is determined (S2000). When the combination of the length L1 of the high temperature part internal space 110 and the length L3 of the low temperature part 500 internal space 540 having the maximum output is determined, the gas is inserted into the thermoacoustic generator (S3000). The high temperature unit 100 is heated by the heating unit 200 and the low temperature unit is cooled by the cooling unit 400. A temperature difference ΔT occurs and a sound is generated when the temperature difference ΔT exceeds a specific temperature (S4000). As the temperature difference ΔT increases, the amplitude of the sound output increases in proportion, but the change in the temperature difference ΔT changes the length L1 of the high-temperature section internal space 110 and the low-temperature section internal space to obtain the maximum output. The combination ratio of the lengths L3 of 540 does not vary.

1A is a cross-sectional view of a thermoacoustic generator capable of variable frequency according to the present invention;

Figure 1b is a cross-sectional view of the capillary showing the phase change of the gas inside the capillary tube of the thermoacoustic exchanger,

Figure 1c is a graph showing the temperature of the internal space according to the length (L) of the thermoacoustic generator,

Figure 1d is a graph showing the change in volume and pressure changes as the gas circulates in the thermoacoustic generator,

FIG. 2 is a cross-sectional view of the heating means, taken along line A-A 'of FIG. 1A;

3A is a cross-sectional view of the cooling means, taken along line B-B 'of FIG. 1A;

3b is a side view of the cooling means,

4 is a graph showing the magnitude of the sound output according to the change in temperature difference with time;

5a is a graph showing the magnitude of the output sound, the temperature difference and the magnitude of the output sound according to the change of L3 when L1 and L2 are fixed to L1 + L2 / 2 = 45 mm;

FIG. 5B is a graph showing the sound volume of the internal space of the thermoacoustic generator and the amount of sound output to the outside when L1 and L2 are fixed to L1 + L2 / 2 = 70 mm;

6a is a graph showing a change in a specific frequency according to the change of L1 and L2,

6b is a graph showing a change in a specific frequency of 1200 Hz or less in accordance with the change of L1 and L2;

7 is a graph showing a relationship between L1 and L2 for fixing L2 and having maximum sound output;

8 is a flowchart of a thermoacoustic generation method using a thermoacoustic generator capable of varying frequency;

9 is a flowchart of a first embodiment of a length adjusting method for obtaining a maximum sound output in a thermoacoustic generator;

FIG. 10 is a flowchart of a second embodiment of a length adjusting method for obtaining a maximum sound output in a thermoacoustic generator.

<Description of the symbols for the main parts of the drawings>

10: thermoacoustic generator

100: high temperature part

110: high temperature inner space

120: length adjustment means

121: A steering wheel

122: an axis

123: piston

130: closed

140: High temperature part appearance

200: heating means

210: tungsten heater

220: power supply

230: power control device

300: thermoacoustic exchanger

310: appearance of the heat acoustic exchanger

320: capillary tube

321: inside the capillary

330: constant gas particle unit

400: cooling means

410: flow rate supply unit

420: flow rate discharge part

430: flowmeter

440: flow controller

450: flow pump

500: low temperature part

510: heat acoustic generator

520: The first low temperature part

530: the second low temperature part

540: coupling means

541: female thread

542: male thread

600: noise meter

L: Thermoacoustic generator length (L1 + L2 + L3 = L)

L1: Length of inner space of high temperature part

L2: length of thermoacoustic exchanger

L3: length of inner space of low temperature part

P: pressure inside the thermoacoustic generator

V: volume per unit of gas

f: specific frequency

c: sonic

ΔT: Temperature difference between high temperature and low temperature

a: Temperature difference curve over time

b: Acoustic output magnitude curve with temperature difference over time

Claims (22)

In the thermoacoustic generator, A high temperature portion having a hollow tube shape having an inner space and an open portion at one side thereof and a closed portion at a side thereof; Heating means coupled to the open portion of the hot portion to heat a gas in an inner space of the hot portion; A low temperature part of a tubular shape having an inner space and both sides of which are open and one side of which has a thermoacoustic generator for generating sound; Cooling means for cooling the gas in the inner space of the low temperature portion on the opposite side of the heat acoustic generation portion of the low temperature portion; And The open portion of the high temperature portion coupled to the heating means and the open side of the low temperature portion coupled to the cooling means are provided with a plurality of capillaries, and the gas can exchange the inner space of the high temperature portion with the inner space of the low temperature portion. A heat acoustic exchanger, including converting thermal energy into acoustic energy to generate a sound having a specific frequency, The specific frequency of the sound generated by the thermoacoustic generator changes in inverse proportion to the length of the thermoacoustic generator, which is the sum of the length of the inner space of the hot portion, the length of the thermoacoustic exchanger, and the length of the inner space of the low temperature portion, The hot portion is provided with a length adjusting means to adjust the length of the internal space of the hot portion including the gas circulated by the thermoacoustic exchanger to adjust a specific frequency of the sound generated by the thermoacoustic generator, The low temperature unit may be provided in plural and each low temperature unit may include a coupling means to combine or separate the low temperature units to adjust the length of the inner space of the low temperature unit to change the specific frequency of the sound generated by the thermoacoustic generator. Thermoacoustic generator capable of variable frequency, characterized in that. The method of claim 1, The capillary is a thermoacoustic generator capable of variable frequency, characterized in that the SUS capillary. delete The method of claim 1, The change of the specific frequency, When the specific frequency is in the range of 2500 Hz or more and less than 20000 Hz, the change in length of the inner space of the high temperature part has a greater influence on the change of the specific frequency than the change of the length of the space inside the low temperature part. In the case of the region where the specific frequency is greater than 0 hertz and less than 2500 hertz, the change in length of the inner space of the low temperature part has a greater influence on the change of the specific frequency than the change of the length of the inner space of the high temperature part. Thermoacoustic generator. The method of claim 1, The gas of the low temperature portion is cooled and compressed by the cooling means, the gas of the high temperature portion is heated and expanded by the heating means is circulated through the capillary of the thermoacoustic exchanger to convert thermal energy into sound Thermoacoustic generator capable of variable frequency. delete delete The method of claim 1, The heating means, Is provided in the open portion of the high temperature portion and corresponds to the heater, The heater is a thermoacoustic generator capable of variable frequency, characterized in that it comprises a tungsten heater that is powered by a power supply and heated and a power control means connected to the power supply to adjust the power. The method of claim 8, The cooling means, Corresponding to a water-cooled device, the water-cooled device generates a thermoacoustic variable sound, characterized in that the flow rate supplied from the flow rate supply portion cools the gas inside the capillary tube while flowing in the outer appearance of the capillary tube, and the flow rate is discharged to the flow rate discharge unit Device. The method of claim 1, And an output amplitude of the sound output from the thermoacoustic generator is proportional to a temperature difference between the low temperature unit and the high temperature unit. The method of claim 10, And the thermoacoustic generator starts generating sound at a specific temperature difference. The method of claim 11, When the length of the thermoacoustic exchanger and the length of the inner space of the low temperature section is fixed, the thermoacoustic generator capable of variable frequency, characterized in that it has a maximum output size of the sound at a specific length of the inner space of the high temperature section. The method of claim 11, When the length of the thermoacoustic exchanger and the length of the internal space of the hot portion is fixed, the thermoacoustic generator device having a variable frequency, characterized in that it has a maximum output size of the sound at a specific length of the inner space of the cold portion. In the method of adjusting the length of the thermoacoustic generator of claim 1, Determining a length of the inner space of the cold part by combining a plurality of tubular low temperature parts having a fixed length and having various lengths of the inner space; Inserting a gas into an inner space of the hot part and the cold part; Forming a temperature difference between the heating means and the cooling means between the high temperature portion and the low temperature portion; If the temperature difference exceeds a specific value, gas is circulated by a thermoacoustic exchanger to output sound; And And controlling the length of the high temperature part internal space for outputting the maximum sound output according to the determined length of the low temperature part internal space by adjusting the length adjusting means. How to adjust the position. In the method of determining the length of the internal space in the thermoacoustic generator of claim 1, A length of the thermoacoustic exchanger is fixed and determined by adjusting the length of the internal space of the hot portion by a length adjusting means; Determining a length of the low temperature part internal space by combining a plurality of tubular low temperature parts having a length of various internal spaces for producing a maximum sound output according to the determined length of the high temperature part internal space; Inserting a gas into an inner space of the hot part and the cold part; Determining a temperature difference between the high temperature portion and the low temperature portion with the heating means and the cooling means; And And gas is circulated by the thermoacoustic exchanger when the temperature difference exceeds a specific value, thereby outputting a sound. 15. The method of claim 14, In the fixed temperature difference, the length of the inner space of the high temperature part and the length of the inner temperature of the low temperature part, in which the magnitude of the sound output is maximized, Internal positioning method of the thermoacoustic exchanger for the maximum sound output, characterized in that each proportional to each other. The method of claim 15, In the fixed temperature difference, the length of the inner space of the high temperature part and the length of the inner temperature of the low temperature part, in which the magnitude of the sound output is maximized, Internal positioning method of the thermoacoustic exchanger for the maximum sound output, characterized in that each proportional to each other. In the thermoacoustic generation method using the thermoacoustic generator of claim 1, Supplying a gas to a thermoacoustic generator so that the gas is filled into the inner space of the high temperature section and the inner space of each of the capillary tubes provided in the thermoacoustic exchanger and the low temperature section; A power supply device supplies electric power to a tungsten heater to heat the internal space of the high temperature portion by the tungsten heater, and a flow rate is supplied from the flow rate supply of the cooling means to flow through the appearance of the capillary tube to cool the capillary tube to cool the low temperature portion and the high temperature portion. Forming a temperature difference between the two; And And generating a sound having a specific frequency in the thermoacoustic generator by circulating the inner space of the low temperature portion and the inner space of the high temperature portion through the capillary of the thermoacoustic exchanger when the temperature difference exceeds a specific value. Thermoacoustic generation method capable of variable frequency, characterized in that. The method of claim 18, The capillary is a thermoacoustic generation method capable of variable frequency, characterized in that the SUS capillary. The method of claim 18, And the specific frequency is inversely proportional to the length of the thermoacoustic generator, which is the sum of the length of the inner space of the high temperature part, the length of the thermoacoustic exchanger, and the length of the inner space of the low temperature part. The method of claim 18, In the sound generation step having the specific frequency, The magnitude of the sound output is proportional to the temperature difference, and generates a sound at a specific minimum temperature difference, Combining means is a combination of a plurality of the low temperature portion to determine the length of the inner space of the low temperature portion, and adjusting the length of the inner space of the high temperature portion by the length adjusting means of the high temperature portion according to the determined length of the low temperature portion inner space; Thermoacoustic generation method capable of variable frequency, characterized in that. The method of claim 21, A method of generating a variable frequency acoustic frequency, characterized in that it has a specific length having a maximum sound output by adjusting the length of the inner space of the hot portion and the length of the inner space of the cold portion relative to the length of the fixed thermoacoustic exchanger.

Images