A fiber filter sound field coupling module and an air filtration device

Abstract

The utility model discloses a kind of fibre filter material sound field coupling module and air filter device, air filter device includes the frame support structure being installed in the ventilation duct and with the ventilation duct cross section shape conformity, the circumferential outer wall of the frame support structure is fixedly connected with ventilation duct inner wall, fibre filter material is fixed on the frame support structure, along the flow direction of air intake, the fibre filter material is located in the rear of air intake in ventilation duct, loudspeaker is fixed on the outer wall of the ventilation duct, the loudspeaker is connected with power amplifier by audio line, the fibre filter material is arranged in the effective sound field action range of the loudspeaker, air guide fan is installed at the air outlet of ventilation duct. Adopt this device can improve filtering efficiency, reduce equipment maintenance frequency, reduce ventilation system annual operation energy consumption, and can better cope with the filtering demand of tiny particle.

Description

Technical Field

[0001] This utility model relates to air purification devices, and more particularly to a filtration device that couples sound field with fiber filter media. Background Technology

[0002] Fiber filtration is the mainstream method for removing micron and submicron particles from the air. Compared with other mechanical separation purification technologies, electrostatic purification technologies, and combined purification technologies, it has the advantages of convenient installation, high efficiency, and cost-effectiveness, and is widely used in air purification systems. The mechanism by which fiber filters remove particles depends on Brownian diffusion, inertial impaction, and interception. In addition, another mechanism, such as electrostatic force, can also be considered. However, in practical use, high-efficiency filters have prominent problems such as low filtration efficiency, short service life, high replacement costs, and high filtration resistance.

[0003] Chinese patent CN210729030U, entitled "An Acousto-Electrical Coupled Fine Particulate Matter Removal Device," includes a discharge coagulation zone, an inertial settling zone, an aerosol dust collection zone, an inertial dust collection zone, and an acoustic-electric coupled agglomeration dust collection zone. A sound wave generator is used to emit a sound field, and an electrode plate provides charge to the particles, thereby enhancing the charging effect of the particles. The setting of wire electrodes and barbed wire electrodes is used to generate an electric field. This invention achieves the charging, coagulation, and capture of fine particulate matter through the synergistic effect of the sound field and the electric field. However, this invention has disadvantages such as complex structure, high manufacturing cost, difficult maintenance, and limited synergistic effect of the sound field and the electric field.

[0004] Chinese patent CN207614530U, entitled "A Sound Field Enhanced Gas Coalescing Separation Filter," describes a filter comprising a filter body, a filter element, and multiple sound wave output devices. The sound waves generated by the output devices form a uniform sound field, guiding contaminated particles towards stationary particles already deposited on the filter element surface, rather than into the filter element's pores. This effectively reduces the rate at which the filter element's internal pores become clogged by contaminant particles. However, this patent only focuses on the effect of sound waves on contaminant particles and does not fully consider the impact of sound waves on the filter material and its potential optimization effects. Furthermore, the complex equipment requires higher design and maintenance costs.

[0005] Publication number CN112791552A, utility model title: "Filter Media Polarization Module and Air Filtration Device for Air Filtration Device", provides a filter media polarization module filtration technology. It utilizes the polarization of filter media under high voltage electrostatics to improve the fiber filtration efficiency of particulate matter. Although it effectively avoids problems such as high voltage electrostatic breakdown and ozone, it still poses safety hazards such as discharge caused by the accumulation of surface charge of particulate matter and local electric sparks caused by high voltage electrostatics when purifying highly oily particulate matter. In addition, this technology faces the problem of complex modification of fiber filtration modules in existing purification systems.

[0006] Publication number DE10321921A1, utility model name "Staubsauger mit einer Utraschall" "Reinigungsvorrichtung für Keramikfilter" utilizes the vibration of an ultrasonic transducer, which is transmitted to the ceramic filter element through contact, thereby cleaning the deposited particles in the ceramic filter element. This maintains the performance of the vacuum cleaner's ceramic filter, while reducing maintenance needs and extending the equipment's lifespan. The focus is on the ultrasonic vibration cleaning function. However, the ultrasonic transducer relies on its own generated vibration and conduction in the solid, which has the problems of short working time and heat generation. It cannot work for a long time and can only achieve a short-term vibration cleaning function for the deposited particles inside the ceramic filter element.

[0007] The utility model, with publication number CN2825074Y and titled "Ultra-high Temperature Bag Filter with Cleaning Device," describes a device that uses a sonic vibration cleaning device installed on the top of the ultra-high temperature bag filter housing. This device utilizes the resonance generated by sonic vibration to break down the dust layer, thereby achieving efficient cleaning. However, this utility model primarily focuses on resonance cleaning and does not address the impact of sonic vibration on filtration efficiency.

[0008] Publication number EP1503844A1, utility model name "MODULATED ACOUSTIC AGGLOMERATION SYSTEM AND METHOD", applies a modulated sound field to the fluid, and promotes particle collision and aggregation by modulating the frequency, amplitude or a combination of both. However, this utility model only filters the particles after they are aggregated by the sound field, without considering the effect of the sound field on the filter material. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a fiber filter material sound field coupling module and an air filtration device. This device utilizes the coupling effect between the sound field and the fiber filter material, and uses sound waves to act on particulate matter and fiber filter material respectively to achieve multiple functions such as filtration, self-cleaning and performance optimization. It improves filtration efficiency, reduces equipment maintenance frequency, reduces the annual energy consumption of the ventilation system, and can better meet the filtration needs of fine particles.

[0010] To achieve the above objectives, this utility model adopts the following technical solution: This utility model discloses a fiber filter material sound field coupling module, including a frame support structure and a loudspeaker. Fiber filter material is fixed on the frame support structure. The loudspeaker is connected to a power amplifier via an audio cable. The signal input terminal of the power amplifier is connected to a signal generator. The signal generator is used to control the start and stop of the loudspeaker and the magnitude of the sound frequency and sound pressure. The fiber filter material is disposed within the effective sound field range of the loudspeaker.

[0011] This utility model discloses an air filtration device, comprising a frame support structure installed inside a ventilation duct and conforming to the cross-sectional shape of the ventilation duct. The outer circumferential wall of the frame support structure is fixedly connected to the inner wall of the ventilation duct. Fiber filter material is fixed on the frame support structure and is located behind the air inlet in the ventilation duct along the airflow direction. A loudspeaker is fixed on the outer wall of the ventilation duct and is connected to a power amplifier via an audio cable. The fiber filter material is positioned within the effective sound field range of the loudspeaker. An exhaust fan is installed at the air outlet of the ventilation duct.

[0012] The advantages of this utility model are: This invention utilizes a loudspeaker, a signal simulator, and a power amplifier to form a sound wave generating system, which operates without contact with the fiber. The sound waves generated by the loudspeaker cause vibration in all the air within the purification duct. This resonance and vibration effect between airborne particles and the fiber filter media increases the probability of contact and impact, thereby improving filtration efficiency. The sound waves also enhance the fluid permeability of the filter media. The vibration of the sound waves improves the flow state of the fluid within the fiber filter media, thus reducing pressure loss as air flows through the filter media and improving the system's permeability. Furthermore, the sound wave generating system can continuously generate sound waves and propagate them in the air for an extended period, effectively improving the efficiency of the fiber and the filtration system over a long period.

[0013] Simultaneously, with the assistance of sound waves, tiny particles can collide with each other, meaning that small particles are more likely to collide and aggregate into larger particles under the influence of sound wave vibration. This agglomeration effect not only improves the efficiency of particle capture but also reduces the maintenance requirements of the filtration device; the fiber filter media also features strong structural integrity, low airflow resistance, and washability for reuse. The filtration device of this invention can be used independently as a purification module, flexibly installed in various air purification systems, or integrated as an upgrade component of existing purification systems.

[0014] The speaker used in this invention has adjustable sound frequency and sound pressure within a certain range. The sound frequency and sound pressure emitted by the speaker can be finely adjusted according to the specific type of particulate matter and fiber filter media to be filtered. This adjustment capability enables the filtration system to achieve the best filtration effect for different filtration needs, thereby significantly improving filtration efficiency.

[0015] This structure utilizes the coupling effect of sound field and fiber filter media to construct a multi-mechanism synergistic high-efficiency filtration system: the acoustic vibration generated by the sound field causes airborne particles and fiber filter media to resonate and undergo forced vibration, respectively, altering the particle trajectory and fiber spatial orientation, significantly increasing the contact and impact frequency between particles and fibers, thereby improving the capture efficiency of submicron-sized and other difficult-to-capture particles without sacrificing the air permeability of the filter media; simultaneously, the sound waves can drive the fibers to generate micro-amplitude high-frequency vibrations, which effectively promote the shedding of particles (including highly viscous oily particles) accumulated on the surface and within the pores of the filter media, reducing the amount of filter media residue. The clogging phenomenon is reduced, the frequency of filter media replacement is decreased, the service life of the filter media is significantly extended, and the equipment maintenance cost is reduced. In addition, the effect of sound waves can optimize the fluid permeability within the filter medium, improve the flow state of air in the fiber filter media, and reduce the flow resistance of air flowing through the filter media, thereby reducing the pressure loss during system operation and effectively reducing filtration energy consumption. Moreover, under the excitation of sound wave vibration, nano- and submicron-sized particles in the air are more likely to collide with each other and agglomerate to form larger particle clusters. This agglomeration effect can further improve the capture efficiency of small particles in subsequent filtration stages and comprehensively enhance the overall filtration performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the air filtration device of this utility model; Figure 2 A graph showing the particle size efficiency data of G3 fiber filter media in a comparative experiment. Figure 3 A graph showing the particle size efficiency data of F6 fiber filter media in a comparative experiment. Figure 4 This is a graph showing the particle size efficiency data from a comparative experiment of F8 fiber filter media. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, a detailed description is now provided in conjunction with specific embodiments and accompanying drawings. The embodiments and descriptions are for illustrative purposes only and do not constitute a limitation on the scope of this utility model.

[0018] As shown in the attached diagram, this utility model discloses a fiber filter material sound field coupling module, comprising a frame support structure 5 and a speaker 3. Fiber filter material 6 is fixed to the frame support structure. The speaker is connected to a power amplifier 2 via an audio cable. The signal input terminal of the power amplifier is connected to a signal generator 1, which controls the speaker's start / stop and the sound pressure level. The fiber filter material is positioned within the effective sound field range of the speaker. The fiber filter material includes, but is not limited to, glass fiber, polyester fiber, polypropylene fiber, polyamide fiber, ceramic fiber, etc. The selection of different filter materials depends on specific filtration requirements, such as filtration efficiency, temperature resistance, and chemical stability.

[0019] This utility model discloses an air filtration device, comprising a frame support structure 5 installed within the ventilation duct 7 and conforming to the cross-sectional shape of the ventilation duct. The outer circumferential wall of the frame support structure is fixedly connected to the inner wall of the ventilation duct. If the cross-section of the ventilation duct is rectangular, the frame support structure is a rectangular plate structure. Fiber filter material 6 is fixed to the frame support structure, positioned behind the air inlet 4 within the ventilation duct 7 along the airflow direction. A speaker 3 is fixed to the outer wall of the ventilation duct 7, secured by a bracket and screws. The speaker is connected to a power amplifier via an audio cable. The number of speakers is unlimited and can be matched according to the size of the device. The fiber filter material is positioned within the effective sound field range of the speaker. An induced draft fan 8 is installed at the air outlet of the ventilation duct, which works in conjunction with the ventilation system to generate air pressure.

[0020] If the number of speakers is ≥2, preferably, multiple speakers are connected in parallel and connected to power amplifier 2. Preferably, the distance between the fiber filter material and the speakers does not exceed 500mm, and the arrangement between them is non-contact; the fiber filter material generates micro-vibration under the action of the sound field, which enhances the particulate matter interception efficiency by increasing the effective filling rate, while the sound waves cause the particulate matter in the air to resonate and agglomerate, reducing the filtration resistance.

[0021] Preferably, a groove is provided on the outer wall of the ventilation duct, the radiating surface of the speaker is fixed in the groove, and silicone is applied between the speaker and the outer wall of the ventilation duct to enhance the airtightness. This can effectively enhance the sealing performance, reduce energy loss, improve the transmission efficiency of sound waves, and provide a certain degree of protection, thereby improving the stability and service life of the system.

[0022] The working process and working principle of this device are as follows: When this device is in use, the air inlet 4 and air outlet 9 of the ventilation duct 7 can be connected to the ductwork of the ventilation system requiring filtration via flanges. This allows polluted air to enter the filtration device through the ventilation duct, ensuring a smooth airflow path.

[0023] The frame support structure 5 is used to fix the fiber filter media 6, providing necessary mechanical support for the fiber filter media, thereby ensuring that the entire device will not be displaced or deformed due to vibration or fluid impact during operation. Furthermore, under the influence of sound waves, the frame structure can also play a certain role in vibration reduction and sound insulation, effectively preventing the transmission of sound waves from interfering with other components and improving the overall performance of the filtration device.

[0024] The loudspeaker 3 converts electrical energy into mechanical vibration, which in turn generates sound waves. When polluted air enters the filter device through the air inlet 4, the power amplifier 2 and signal generator 1 are activated, and the sound frequency and sound pressure are adjusted to predetermined values. The loudspeaker then begins to operate, converting the input electrical energy into high-frequency vibrations and generating sound waves. These sound waves propagate through the loudspeaker's diaphragm into the filter device, causing small particles and fiber filter media in the air to vibrate. The sound waves not only improve the separation efficiency of particulate matter and prevent filter media clogging, but also optimize the fluid dynamics of airflow through the fiber filter media, reducing pressure loss and thus improving the overall performance of the filtration system.

[0025] The three-dimensional structure and multi-layered fiber arrangement of the fiber filter media 5 provide multiple filtration mechanisms for particles of different sizes. During the filtration process, as polluted air flows through the filter media, small particles in the air are drawn towards the surface of the fiber filter media by the action of sound waves. The three-dimensional structure and multi-layered fiber arrangement of the fiber filter media can capture small particles of different sizes. Larger particles are directly intercepted, while finer particles are more easily captured by the fibers due to the Brownian motion and inertial impact induced by the sound waves. The vibration of the fibers induced by the sound waves can increase the effective contact area and arrangement density of the fibers, which helps to improve the filtration efficiency of the filter media. At the same time, the vibration keeps the surface of the fiber filter media clean, preventing excessive particle adhesion and clogging, thereby extending the service life of the filter media.

[0026] After polluted air enters the filtration device, the coupling effect of the sound field and the fiber filter media generates multiple physical mechanisms. These mechanisms include sound waves exciting the vibration of the filter media, sound waves causing particulate matter to agglomerate into larger particles, and vibration maintaining the cleanliness of the filter media. Polluted air from the ventilation system requiring filtration enters the inlet of the filtration device and is evenly distributed along the ventilation duct. Simultaneously, the loudspeaker is activated, and driven by current, electrical energy is converted into mechanical vibration according to electromagnetic principles, thus generating sound waves. These sound waves propagate through the vibrating diaphragm to the air and fiber filter media inside the filtration device. The vibration of the sound waves breaks the laminar flow of the air, making the air more turbulent within the filter media, increasing the probability of contact between particulate matter and fibers. The effect of the sound waves makes it easier for small particles to collide and agglomerate, forming larger particles that are thus more efficiently captured by the filter media. The vibration induced by the sound waves increases the collision frequency between particles and fibers, resulting in more effective particle capture during filtration. It also reduces particle deposition on the filter media surface, preventing clogging and maintaining low pressure loss. After undergoing the coupling effect of the sound field and the fiber filter media, most of the pollutant particles in the polluted air are captured and removed by the filter media. The purified clean air continues to flow along the channel and is eventually discharged from the air outlet of this filtration device, completing the entire air purification process.

[0027] This application also provides a comparative experiment on the filtration efficiency of traditional filtration and the filtration efficiency of this utility model: A comparative experiment of traditional fiber filter media and a sound field with a coupled audio frequency of 1kHz and a sound pressure level of 150dB.

[0028] In Figure 1 The air filtration device was tested on a prototype experimental platform. The fan 8, located at the air outlet of the ventilation duct 7, was turned on, creating negative pressure in the ventilation duct 7. A stable oil mist particle generator was used to produce oil mist particles, which entered the duct through the air inlet 4. The concentrations upstream and downstream of the fiber filter media were measured using an optical particle counter, and the filtration efficiency of the traditional fiber filter media was calculated. Under the same conditions, before the oil mist particles entered the duct through the air inlet 4, the power amplifier 2 and the signal generator 1 were turned on, and the sound frequency and sound pressure were adjusted to 1kHz and 150dB, respectively. The concentrations upstream and downstream of the fiber filter media were measured using an optical particle counter, and the filtration efficiency was calculated.

[0029] After conducting multiple sets of experiments, it can be concluded that the filtration efficiency of fiber filter media for submicron particles can be significantly improved; the efficiency increase of G3 filter media is 17.0%; the efficiency increase of F6 filter media is 11.5%; and the efficiency increase of F8 filter media is 10.5%. Figure 2 , Figure 3 , Figure 4The data represent the experimental particle size efficiency of fiber filter media for G3, F6, and F8 filters, respectively.

[0030] In the filter media sound field coupling module of the present invention, there are multiple options for the combination and arrangement of the filter media and the loudspeaker. Any combination that can achieve effective sound field coupling between the filter media and the loudspeaker and improve the filtration performance should be considered as part of the present invention.

[0031] The above description is a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple structural modifications, equivalent changes, or simple replacements of profiles made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fiber filter material acoustic field coupling module, characterized in that: The system includes a frame support structure (5) and a loudspeaker (3). A fiber filter material (6) is fixed on the frame support structure. The loudspeaker is connected to a power amplifier (2) via an audio line. The signal input terminal of the power amplifier is connected to a signal generator (1). The signal generator is used to control the start and stop of the loudspeaker and the magnitude of the sound pressure level. The fiber filter material is located within the effective sound field range of the loudspeaker.

2. An air filtration device, employing the fiber filter material acoustic field coupling module as described in claim 1, characterized in that: The system includes a frame support structure installed inside a ventilation duct and conforming to the cross-sectional shape of the duct. The outer circumferential wall of the frame support structure is fixedly connected to the inner wall of the ventilation duct. Fiber filter material is fixed on the frame support structure along the airflow direction and is located behind the air inlet in the ventilation duct. A loudspeaker is fixed on the outer wall of the ventilation duct and is connected to a power amplifier via an audio cable. The fiber filter material is positioned within the effective sound field range of the loudspeaker. An exhaust fan is installed at the air outlet of the ventilation duct.

3. The air filtration device according to claim 2, characterized in that: If the number of speakers is ≥2, multiple speakers are connected in parallel and connected to the power amplifier.

4. The air filtration device according to claim 3, characterized in that: The distance between the fiber filter material and the loudspeaker shall not exceed 500 mm, and the arrangement between them shall be non-contact.

5. The air filtration device according to claim 4, characterized in that: A groove is provided on the outer wall of the ventilation duct, the radiating surface of the speaker is fixed in the groove, and silicone is applied between the speaker and the outer wall of the ventilation duct.

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