A kind of enhanced condensation heat exchange device based on sound wave excitation droplet vibration drop

Abstract

The application relates to a reinforced condensation heat exchange device based on the vibration drop of liquid drops under the excitation of sound waves, and belongs to the technical field of radiators. The device comprises a condenser, connecting pieces and a sound wave generator. The surface of the condenser is provided with micro columns in an array distribution. The sound wave generator comprises a sound wave generator bottom plate and sound emitting sources uniformly arranged on the sound wave generator bottom plate. The two sides of the condenser are connected with the sound wave generator bottom plate through the connecting pieces, and the top end surface of the micro column faces the sound wave generator. The distance from the top end surface of the micro column to the sound emitting source is adjusted by the connecting pieces. The liquid condensed on the top end of the micro column is rapidly dropped under the excitation of sound waves, the thermal resistance is reduced, and the heat exchange efficiency is reinforced. The surface structure of the traditional condenser is changed, the liquid film is thinned by using the excitation of sound waves, the condensation heat exchange is reinforced, the problem that the heat exchange efficiency of the condenser is restricted due to the liquid film formed on the surface in the heat exchange process of the traditional condenser is effectively solved, and the overall energy efficiency utilization is improved.

Description

Technical Field

[0001] This invention relates to an enhanced condensation heat exchange device based on acoustic wave-excited droplet vibration and shedding, belonging to the field of radiator technology. Background Technology

[0002] As a crucial component of refrigeration systems, the condenser's primary function is to cool gas and convert it into a liquid form. Condensation heat transfer generally takes two forms: film condensation and droplet condensation. Droplet condensation has a significantly higher heat transfer coefficient than film condensation. This is because in droplet condensation, the solid wall surface is partially occupied by liquid droplets, while the remaining portion is exposed to the vapor. Therefore, heat transfer occurs between the vapor and the liquid droplet surfaces, and between the vapor and the exposed wall. Since the surface area of ​​the liquid droplet is much larger than the surface area of ​​the wall it occupies, and there is no thermal resistance from a liquid film on the exposed wall, the heat transfer coefficient of droplet condensation is more than ten times that of film condensation. In contrast, in film condensation, a liquid film separates the vapor from the wall. The phase change heat (latent heat) released during condensation must pass through this liquid film to reach the cooled wall surface. The presence of the liquid film increases thermal resistance, resulting in a lower heat transfer coefficient. Although droplet condensation offers better heat transfer, its instability makes it difficult to apply in engineering projects. Therefore, film condensation is more commonly encountered in industrial equipment. In traditional condensers, the gradual increase in liquid film thickness reduces heat exchange efficiency. Therefore, after saturated steam condenses on the condenser surface, it is necessary to quickly remove the condensate droplets to reduce thermal resistance and improve heat exchange efficiency. Summary of the Invention

[0003] This invention addresses the problem of liquid film formation on the surface of condensers affecting heat transfer efficiency during operation. It proposes an enhanced condensation heat exchange device based on acoustic wave-excited droplet vibration and detachment. This invention uses acoustic wave excitation to rapidly detach the liquid condensed at the top of the micro-column, reducing thermal resistance and further enhancing heat transfer efficiency. By altering the surface structure of traditional condensers and utilizing acoustic wave excitation to thin the liquid film, the invention achieves enhanced condensation heat transfer. This effectively solves the problem of heat transfer efficiency being limited by the formation of a liquid film on the surface of traditional condensers during heat exchange, thereby improving overall energy efficiency.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows:

[0005] An enhanced condensation heat exchange device based on acoustic wave-excited droplet vibration and shedding includes a condenser 1, a connector 2, and an acoustic wave generator.

[0006] The surface of the condenser 1 is provided with micropillars 5 arranged in an array, and the heat exchange surface of the condenser 1 is a hydrophobic surface.

[0007] The sound wave generator includes a sound wave generator base plate 3 and sound sources 4 evenly arranged on the sound wave generator base plate 3. The two sides of the condenser 1 are connected to the sound wave generator base plate 3 through connectors 2. The top surface of the micro-pillar 5 faces the sound wave generator. The sound wave generator base plate 3 is used to integrate the sound sources 4 to ensure the effectiveness and stability of sound wave transmission.

[0008] The distance between the top surface of the micro-column 5 and the sound source 4 is adjusted by the connector 2.

[0009] Preferably, the sound source 4 includes a housing 4-1, an iron core 4-2, a magnet 4-3, a gasket 4-4, an elastic sheet 4-5, a coil 4-6, a diaphragm 4-7, and a dust cover 4-8. The housing 4-1 includes a bottom plate and a side plate vertically fixed to the edge of the bottom plate. The bottom plate is fixedly mounted on the sound generator base plate 3. The iron core 4-2 includes a core bottom and a core rod vertically mounted at the center of the core bottom. The core bottom is fixedly mounted on the bottom plate of the housing 4-1. Magnet 4-3 is positioned along the edge of the iron core bottom to form a magnet cylinder, which is concentric with the iron core rod. Coil 4-6 is wound around the iron core rod. Diaphragm 4-7 is positioned directly above the iron core rod. One end of elastic sheet 4-5 connects coil 4-6 and diaphragm 4-7, and the other end of elastic sheet 4-5 is fixed to the inner wall of outer shell 4-1 by two upper and lower pads 4-4. Dust cover 4-8 is fixed directly above diaphragm 4-7 and is in contact with the top of inner wall of outer shell 4-1. The iron core rod at the center of iron core 4-2 serves as the carrier of coil 4-6. Magnet 4-3 cooperates with electromagnetic coil 4-6. Elastic sheet 4-5 vibrates under magnetic force. When coil 4-6 is energized, it generates a magnetic field. The magnetic field generated by coil 4-6 interacts with magnet 4-3 to generate vibration force, causing diaphragm 4-7 to vibrate and emit sound waves of a preset frequency. Dust cover 4-8 protects the internal components of outer shell 4-1 of sound source 4 from external contamination.

[0010] The magnet 4-3 is preferably a high-strength neodymium iron boron magnet to ensure the generation of a strong magnetic field and optimize the generation and propagation of sound waves; ensuring excellent magnetic properties can enhance the intensity of sound waves, so as to more effectively stimulate droplet detachment.

[0011] The elastic sheet 4-5 can generate high-frequency vibration under the action of magnetic force, and together with the diaphragm 4-7, it forms the main sound-generating component.

[0012] The coils 4-6 are highly conductive coils, preferably copper coils, which are wound in a spiral shape on an iron core rod.

[0013] The dust covers 4-8 are used to protect the internal components of the sound source from external contamination, extend the service life of the equipment, and reduce performance degradation caused by external interference.

[0014] Preferably, the connector 2 is provided with a slide rail, and sliders are fixedly provided on both sides of the condenser 1. The sliders slide on the slide rail to adjust the distance between the condenser 1 and the sound wave generator.

[0015] More preferably, the slider is provided with a scale along the sliding direction, which can facilitate precise adjustment of the distance between the condenser 1 and the sound wave generator.

[0016] Preferably, the control circuit of the sound source 4 of the sound wave generator is built into the base plate 3 of the sound wave generator (see...). Figure 6 The control circuit includes a power supply, a sound source 4 of the sound wave generator, a time relay, and a switch connected in sequence. After the switch is turned on, the time relay opens and closes according to the set time interval to realize the periodic emission of sound waves.

[0017] More preferably, the height of the micropillar 5 is 30-40 μm, the surface of the top 1 / 4 to 1 / 3 of the height of the micropillar 5 is a hydrophilic surface, and the surface of the bottom 2 / 3 to 3 / 4 of the height of the micropillar 5 is a hydrophobic surface.

[0018] More preferably, the sound wave frequency is 20kHz to 20MHz and the intensity is 0.5 to 5W / cm. 2 The frequency and intensity of the sound waves can be adjusted according to specific circumstances to meet the control requirements of liquid films of different thicknesses.

[0019] More preferably, the outer casing 4-1 of the sound source 4 is provided with an anti-corrosion coating to extend the service life of the sound source 4. The outer casing 4-1 is preferably made of aluminum alloy, which has good thermal conductivity and corrosion resistance.

[0020] Preferably, the spacing between the adjacent sound sources 4 (e.g.) Figure 5 )for:

[0021]

[0022] In the formula, D is the distance between adjacent sound sources 4, d is the distance from the sound source to the top surface of the micro-pillar 5 of the condenser 1, r is the radius of the sound source 4, and θ is the sound wave diffusion angle.

[0023] The beneficial effects of this invention are:

[0024] This invention features simple structure, low cost, strong adaptability, environmental protection and energy saving. It addresses the problem of excessively thick liquid film on the surface of the condenser during operation, which deteriorates heat transfer. By using ultrasound to excite the liquid adsorbed on the top of the micro-column, it causes the liquid to vibrate and fall off, thereby reducing thermal resistance and improving the heat transfer rate. Attached Figure Description

[0025] Figure 1 A schematic diagram of an enhanced condensation heat exchange device based on acoustic wave-excited droplet vibration and shedding.

[0026] Figure 2 This is a schematic diagram of the sound source structure;

[0027] Figure 3 This is a schematic diagram of a micropillar structure;

[0028] Figure 4 This is a schematic diagram of a droplet detaching excited by acoustic waves.

[0029] Figure 5 This is a schematic diagram of sound wave diffusion;

[0030] Figure 6 For the control circuit of the sound wave generator;

[0031] In the diagram, 1-condenser, 2-connector, 3-sound generator base plate, 4-sound source, 5-micro column, 4-1-outer shell, 4-2-iron core, 4-3-magnet, 4-4-gasket, 4-5-elastic sheet, 4-6-coil, 4-7-diaphragm, 4-8-dust cover. Detailed Implementation

[0032] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. It should be understood that the present invention is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0033] Example 1: An enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding (see...) Figure 1 It includes a condenser 1, a connector 2, and a sound wave generator.

[0034] The surface of the condenser 1 is provided with micropillars 5 arranged in an array, and the heat exchange surface of the condenser 1 is a hydrophobic surface.

[0035] The sound wave generator includes a sound wave generator base plate 3 and sound sources 4 evenly arranged on the sound wave generator base plate 3. The two sides of the condenser 1 are connected to the sound wave generator base plate 3 through connectors 2. The top surface of the micro-pillar 5 faces the sound wave generator. The sound wave generator base plate 3 is used to integrate the sound sources 4 to ensure the effectiveness and stability of sound wave transmission.

[0036] The distance between the top surface of the micro-column 5 and the sound source 4 is adjusted by the connector 2 in the condenser 1.

[0037] The height of the micropillar 5 is preferably 30–40 μm. The surface of the top 1 / 4 to 1 / 3 of the height of the micropillar 5 is a hydrophilic surface, and the surface of the bottom 2 / 3 to 3 / 4 of the height of the micropillar 5 is a hydrophobic surface (see...). Figure 3 );

[0038] The preferred frequency of the sound wave is 20kHz to 20MHz, and the preferred intensity is 0.5 to 5W / cm. 2 This allows for effective excitation of the liquid film on the condenser surface; the frequency and intensity of the sound waves can be adjusted according to specific circumstances to meet the control requirements of liquid films of different thicknesses.

[0039] The spacing between adjacent sound sources 4 (e.g.) Figure 5 )for:

[0040]

[0041] In the formula, D is the distance between adjacent sound sources 4, d is the distance from the sound source to the top surface of the micro-pillar 5 of the condenser 1, r is the radius of the sound source 4, and θ is the sound wave diffusion angle.

[0042] During condensation heat exchange, the working fluid condenses into droplets on the surface of condenser 1 and micro-pillar 5. The heat exchange surface of condenser 1 and the bottom 2 / 3 to 3 / 4 of the height of micro-pillar 5 are both hydrophobic surfaces. The droplets accumulate on the hydrophilic surface at the top of micro-pillar 5. The sound source 4 of the sound generator synchronously emits sound waves of a preset frequency, exciting and thinning the liquid film on the hydrophilic surface at the top of micro-pillar 5, causing the droplets to vibrate and fall off, thereby reducing thermal resistance and increasing the heat transfer rate (see...). Figure 4 ).

[0043] Example 2: This example of an enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding is basically the same as the enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding in Example 1, except that:

[0044] like Figure 2As shown, the sound source 4 includes a housing 4-1, an iron core 4-2, a magnet 4-3, a gasket 4-4, an elastic sheet 4-5, a coil 4-6, a diaphragm 4-7, and a dust cover 4-8. The housing 4-1 includes a bottom plate and a side plate vertically fixed to the edge of the bottom plate. The bottom plate is fixedly mounted on the sound generator base plate 3. The iron core 4-2 includes a core bottom and a core rod vertically mounted at the center of the core bottom. The core bottom is fixedly mounted on the bottom plate of the housing 4-1. A magnet 4-3 is positioned along the edge of the bottom of the iron core to form a magnet cylinder, which is concentric with the iron core rod. A coil 4-6 is wound around the iron core rod. A diaphragm 4-7 is positioned directly above the iron core rod. One end of an elastic sheet 4-5 connects the coil 4-6 and the diaphragm 4-7, while the other end of the elastic sheet 4-5 is fixed to the inner wall of the outer shell 4-1 via two upper and lower pads 4-4. A dust cover 4-8 is fixed directly above the diaphragm 4-7 and is in contact with the top of the inner wall of the outer shell 4-1. The iron core rod at the center of the iron core 4-2 serves as the carrier for the coil 4-6. The magnet 4-3 cooperates with the electromagnetic coil 4-6. The elastic sheet 4-5 vibrates under the action of magnetic force. When the coil 4-6 is energized, it generates a magnetic field. The magnetic field generated by the coil 4-6 interacts with the magnet 4-3 to generate a vibration force, causing the diaphragm 4-7 to vibrate and emit sound waves of a preset frequency. The dust cover 4-8 protects the internal components of the outer shell 4-1 of the sound source 4 from external contamination.

[0045] The magnet 4-3 is preferably a high-strength neodymium iron boron magnet to ensure the generation of a strong magnetic field and optimize the generation and propagation of sound waves; ensuring excellent magnetic properties can enhance the intensity of sound waves, so as to more effectively stimulate droplet detachment.

[0046] The elastic sheet 4-5 can generate high-frequency vibration under magnetic force, and together with the diaphragm 4-7, it forms the main sound-generating component;

[0047] The coils 4-6 are highly conductive coils, preferably copper coils, which are wound on an iron core rod to form a spiral.

[0048] The dust covers 4-8 are used to protect the internal components of the sound source from external pollution, extend the service life of the equipment, and reduce the performance degradation caused by external interference.

[0049] The outer shell 4-1 of the sound source 4 may be provided with an anti-corrosion coating to extend the service life of the sound source 4; the outer shell 4-1 is preferably made of aluminum alloy, which has good thermal conductivity and corrosion resistance, enhances the structural strength and durability of the equipment, and at the same time ensures effective heat dissipation to avoid temperature rise caused by the operation of the sound source.

[0050] Example 3: This example of an enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding is basically the same as the enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding in Example 2, except that:

[0051] The connector 2 is provided with a slide rail, and sliders are fixedly provided on both sides of the condenser 1. The sliders slide on the slide rail to adjust the distance between the condenser 1 and the sound wave generator, thereby ensuring the optimal control effect of the sound wave on the liquid film.

[0052] More preferably, the slider is provided with a scale along the sliding direction, which can facilitate precise adjustment of the distance between the condenser 1 and the sound wave generator.

[0053] Example 4: This example of an enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding is basically the same as the enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding in Example 3, except that:

[0054] The control circuit for the sound source 4 of the sound wave generator is built into the base plate 3 of the sound wave generator (see...). Figure 6 The control circuit includes a power supply, a sound source 4 of the sound wave generator, a time relay, and a switch, which are connected in sequence. After the switch is turned on, the time relay opens and closes according to the set time interval to realize the periodic emission of sound waves.

[0055] The control circuit can control the period of the sound waves emitted by the sound source as needed, so as to achieve periodic vibration and shedding of the droplets on the top of the micro-pillars on the surface of the condenser.

[0056] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for enhanced condensation heat exchange based on acoustically excited droplet vibration and shedding, characterized in that: Includes a condenser (1), a connector (2), and a sound wave generator. The surface of the condenser (1) is provided with micro-pillars (5) arranged in an array, and the heat exchange surface of the condenser (1) is a hydrophobic surface; the height of the micro-pillars (5) is 30~40μm, the surface of the top 1 / 4~1 / 3 of the height of the micro-pillars (5) is a hydrophilic surface, and the surface of the bottom 2 / 3~3 / 4 of the height of the micro-pillars (5) is a hydrophobic surface. The sound wave generator includes a sound wave generator base plate (3) and a sound source (4) evenly arranged on the sound wave generator base plate (3). The two sides of the condenser (1) are connected to the sound wave generator base plate (3) through connectors (2). The top surface of the micro column (5) faces the sound wave generator. The condenser (1) adjusts the distance between the top surface of the micro-column (5) and the sound source (4) through the connector (2).

2. The enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding as described in claim 1, characterized in that: The sound source (4) includes a shell (4-1), an iron core (4-2), a magnet (4-3), a pad (4-4), an elastic sheet (4-5), a coil (4-6), a diaphragm (4-7), and a dust cover (4-8). The shell (4-1) includes a bottom plate and a side plate vertically fixed to the edge of the bottom plate. The bottom plate is fixedly mounted on the bottom plate (3) of the sound generator. The iron core (4-2) includes a core bottom and a core rod vertically mounted at the center of the core bottom. The core bottom is fixedly mounted on the bottom plate of the shell (4-1). (4-3) A magnet cylinder is formed on the edge of the bottom of the iron core. The magnet cylinder is concentric with the iron core rod. The coil (4-6) is wound on the iron core rod. The diaphragm (4-7) is set directly above the iron core rod. One end of the elastic sheet (4-5) is connected to the coil (4-6) and the diaphragm (4-7). The other end of the elastic sheet (4-5) is fixed to the inner wall of the outer shell (4-1) by two upper and lower pads (4-4). The dust cover (4-8) is fixedly set directly above the diaphragm (4-7) and the dust cover (4-8) is connected to the top of the inner wall of the outer shell (4-1).

3. The enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding as described in claim 1, characterized in that: The connector (2) is provided with a slide rail, and sliders are fixedly provided on both sides of the condenser (1). The sliders slide on the slide rail to adjust the distance between the condenser (1) and the sound wave generator.

4. The enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding as described in claim 1, characterized in that: The sound wave generator base plate (3) contains a control circuit for the sound source (4) of the sound wave generator. The control circuit includes a power supply, the sound source (4) of the sound wave generator, a time relay and a switch connected in sequence.

5. The enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding according to claim 1, characterized in that: The sound wave frequency is 20kHz~20MHz.

6. The enhanced condensation heat exchange device based on acoustically excited droplet vibration and shedding according to claim 1, characterized in that: The distance between adjacent sound sources (4) is: ； In the formula, D The distance between adjacent sound sources (4) d The distance from the sound source to the top surface of the micropillar (5) of the condenser (1) is... r The radius of the sound source (4) θ The angle of sound wave diffusion.

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