Air filter device

Abstract

The application discloses an air filtering device, comprising: a power air inlet part, comprising a first air suction mechanism and a sound attenuation cylinder arranged in the circumference of the first air suction mechanism; a filter core part, in a hollow cylindrical shape, the filter core part being closed at both ends, wherein an air outlet pipe of the first air suction mechanism is sealed and penetrates one end of the filter core part and extends into the inside of the filter core part; a power air outlet part, comprising a second air suction mechanism, an air guide pipe and a sound attenuation assembly arranged on the air guide pipe, wherein the air guide pipe is gap-sealed and sleeved in the circumference of the filter core part, and an air outlet end of the air guide pipe is sealed and communicated with an air inlet end of the second air suction mechanism. The application has the beneficial effects of improving filtering and purifying efficiency in limited space and reducing noise.

Description

Technical Field

[0001] This invention relates to the field of automotive air filtration technology. More specifically, this invention relates to an air filtration device. Background Technology

[0002] With the rapid advancement of industrialization and continuous economic development, life and work are increasingly reliant on automobiles, which have gradually become people's first choice for travel, and the time people spend inside cars has also increased significantly. However, with the gradual deterioration of the atmospheric environment, the interior environment of cars has become even worse. Furthermore, most people also decorate their cars after purchase or refurbish old cars, such as by adding floor mats, seat covers, and adhesives. These decorative materials contain toxic gases, causing air pollution inside the car. The original car trim and fabrics also release harmful particles, further worsening the interior environment.

[0003] Car air purifiers, as a tool for purifying in-vehicle air, can quickly and effectively purify the air inside the car under power. Air pollutants inside a car are mainly divided into two categories: fine particulate matter and VOCs (volatile organic compounds). Currently, the core materials of the filter elements in car air purifiers are mostly ordinary non-woven fiber filter materials, glass fiber filter materials, and meltblown fiber filter materials. Ordinary non-woven filter materials can effectively filter particulate matter; glass fiber filter materials, with their small diameter and pore size, can achieve high filtration efficiency; meltblown electret filter materials can achieve high filtration performance without increasing pressure resistance. Regardless of the material used as the filter element, air purification requires power to force the air inside the car to circulate continuously for continuous purification. This process continuously generates noise, primarily from the power supply machinery (exhaust fan) and airflow vibration. The exhaust fan accelerates the airflow, and the excessively fast airflow generates vibration, thus producing noise; the higher the airflow speed, the louder the noise. The exhaust fan itself also vibrates, thus generating noise. In the confined space of a car, the aforementioned noises are particularly noticeable and persistent in disturbing the human body, causing varying degrees of harm. Summary of the Invention

[0004] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0005] To achieve these objectives and other advantages according to the present invention, an air filtration device is provided, comprising:

[0006] The power air intake includes a first exhaust mechanism and a silencer disposed circumferentially in the first exhaust mechanism;

[0007] The filter element is hollow and cylindrical, with both ends closed. The air outlet pipe of the first exhaust mechanism is sealed through one end of the filter element and extends into the interior of the filter element.

[0008] The power exhaust unit includes a second exhaust mechanism, an exhaust pipe, and a silencer assembly disposed on the exhaust pipe. The exhaust pipe is gap-sealed around the filter element, and the exhaust end of the exhaust pipe is sealed to the air inlet end of the second exhaust mechanism.

[0009] Preferably, the silencer includes a fixed cylinder that is fixed to the circumference of the first exhaust mechanism through a gap in the fixed plate, and an annular first silencer plate laid on the inner side wall of the fixed cylinder, wherein the other end of the fixed cylinder is fixed to the end face of the filter element.

[0010] Preferably, the filter element includes a hollow, near-cylindrical first perforated plate and a second perforated plate spaced apart, and an electret nanofiber membrane filling the space between the first perforated plate and the second perforated plate.

[0011] Preferably, both the first orifice plate and the second orifice plate are shaped like a frustum at the front end and a cylinder at the rear end, wherein the diameter of the frustum at the front end gradually decreases along the airflow direction.

[0012] Preferably, the air duct includes a cylindrical air-receiving duct sleeved outside the filter element and a frustum-shaped air guide duct connected to the air inlet end of the second exhaust mechanism.

[0013] Preferably, the silencing assembly includes an annular second silencing plate laid on the inner wall of the air duct, a fixing sleeve gapped on the outer side of the air duct and the outer side of the air guide pipe, and silencing material filled in the fixing sleeve.

[0014] Preferably, the second silencing plate is provided with a plurality of silencing protrusions spaced apart, and the silencing protrusions are inclined along the airflow direction.

[0015] Preferably, the exhaust pipe of the first exhaust mechanism is provided with a baffle with multiple strip-shaped holes spaced radially, and a primary filter material layer is applied to the baffle.

[0016] Preferably, it also includes a support base, the top of which is fixed to the bottom of the silencer and the bottom of the fixing sleeve by a support frame.

[0017] The present invention has at least the following beneficial effects:

[0018] First, by setting the filter element to a hollow, cylindrical shape, compared to the plate and frame filter structure in the existing technology, it has the effect of significantly increasing the area for filtering and purifying air within a limited space. The filtration area and filtration resistance are inversely proportional within a certain range. The larger the filtration area, the smaller the filtration resistance, and thus the less power is required for ventilation, resulting in less noise.

[0019] Secondly, the first and second perforated plates can provide support and limit the electret nanofiber membrane, allowing it to maintain a preset shape and position, thereby ensuring that the filtration area and filtration resistance remain uniform and stable, and improving filtration and purification efficiency.

[0020] Third, both the first and second orifice plates are shaped like a frustum at the front and a cylinder at the rear, with the diameter of the frustum at the front gradually decreasing along the airflow direction. This shape, with a larger front and smaller rear, matches the airflow pattern. This structural design is intended to reduce airflow resistance, improve filtration efficiency, and, because it conforms to airflow dynamics, reduce vibration and noise caused by airflow.

[0021] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0022] Figure 1 This is a longitudinal cross-sectional schematic diagram of the air filtration device according to one of the technical solutions of the present invention;

[0023] Figure 2 This is a side view of the air filtration device according to one of the technical solutions of the present invention. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0025] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] like Figures 1-2As shown, the meanings of the reference numerals in the attached drawings are as follows: 1. Power air inlet; 2. First exhaust mechanism; 3. Silencer cylinder; 4. Filter element; 11. Air outlet pipe; 5. Power air outlet; 6. Second exhaust mechanism; 7. Air duct; 8. Silencer assembly; 31. Fixing plate; 32. Fixing cylinder; 33. First silencing plate; 41. First perforated plate; 42. Second perforated plate; 43. Electret nanofiber membrane; 71. Air duct; 72. Guide pipe; 81. Second silencing plate; 82. Fixing sleeve; 83. Silencing material; 84. Silencing protrusion; 12. Baffle; 13. Primary filter material layer; 9. Support base; 10. Support frame.

[0027] like Figures 1-2 As shown, the present invention provides an air filtration device, comprising:

[0028] The power air intake 1 includes a first exhaust mechanism 2 and a circumferential silencer 3 disposed on the first exhaust mechanism 2. The first exhaust mechanism 2 typically uses an exhaust fan, which, upon startup, directly draws outside air into the internal structure. The silencer 3 is mainly used to silence the first exhaust mechanism 2 to reduce noise. Air filters are directly installed in the car's interior space, which is relatively small. The noise from the exhaust can easily cause fatigue and annoyance for occupants in such a confined space. Therefore, adding a silencer 3 to the outside of the first exhaust mechanism 2 can significantly reduce the operating noise of the exhaust fan and the vibration noise caused by airflow. The silencer 3 can be formed by laying a sound-absorbing plate on the cylindrical structure; existing technologies include polyester fiberboard, metal flame-retardant sound-absorbing and sound-insulating board, perforated gypsum sound-absorbing board, etc. The silencer 3 is essentially spaced around the outside of the first exhaust mechanism 2 and the air outlet duct 11, effectively reducing the mechanical vibration noise and airflow-induced vibration noise generated during the operation of the first exhaust mechanism 2. A dust filter is installed at the air inlet of the first exhaust mechanism 2 to reduce dust from entering the first exhaust mechanism 2 and the filter element 4.

[0029] The filter element 4 is a hollow, near-cylindrical shape, sealed at both ends. The outlet pipe 11 of the first exhaust mechanism 2 is sealed through one end of the filter element 4 and extends into its interior. Air drawn in from the outside by the first exhaust mechanism 2 enters the inner cavity of the filter element 4, and then is drawn out by external force (the second exhaust mechanism 6), passing through the filter element 4 into the outer cavity (the near-annular cavity formed by the outer wall of the filter element 4 and the inner wall of the exhaust pipe 7), thus achieving air filtration and purification. The hollow, near-cylindrical shape of the filter element 4, compared to the plate-and-frame filter structure in the prior art, significantly increases the area for air filtration and purification within a limited space. The filtration area and filtration resistance are inversely proportional within a certain range; the larger the filtration area, the lower the filtration resistance, resulting in less exhaust power and less noise. The filter material filled in the filter element 4 can be activated carbon, glass fiber paper, electret fiber, etc., with fiber air filtration material being preferred. The basic principle is that when dust-laden airflow passes through the fiber membrane, the fibers, with their unique and disordered structure, intercept fine particles, thus cleaning the air. The outlet duct 11 extends into the filter element 4. Because the filter element 4 has a suddenly expanding space, it buffers the rapid airflow (high-speed airflow) exiting the outlet duct 11, thereby reducing its noise.

[0030] The power exhaust unit 5 includes a second exhaust mechanism 6, an exhaust duct 7, and a silencer assembly 8 disposed on the exhaust duct 7. The exhaust duct 7 is sealed around the filter element 4, and its exhaust end is sealed to the intake end of the second exhaust mechanism 6. Clean air is drawn from the filter element 4 by the power of the second exhaust mechanism 6 and then guided back into the external space (car interior) by the exhaust duct 7. The second exhaust mechanism 6 is typically implemented using a fan, and its power is preferably greater than that of the first exhaust mechanism 2 to accommodate the resistance of air drawn from the filter element. The noise generated by the second exhaust mechanism 6 is greater than that of the first exhaust mechanism 2; therefore, a silencer assembly 8 is provided. The silencer assembly 8 can be made by laying a silencer plate on the inner wall of the exhaust duct 7. The silencer plate can be made of polyester fiber board, metal flame-retardant sound-absorbing and sound-insulating board, perforated gypsum sound-absorbing board, etc. Then, a sound-absorbing structure is added to the outside of the exhaust duct 7. This typically involves constructing an annular cavity on the outside and filling the cavity with sound-absorbing material 83. A dust filter can also be installed on the exhaust end of the second exhaust mechanism 6 to reduce dust entering the second exhaust mechanism 6 and the filter element 4.

[0031] In the above technical solution, after the device is installed inside the car, it is usually installed in the rear seat near the rear window. When the first exhaust mechanism 2 and the second exhaust mechanism 6 are activated, the air inside the car enters directly into the internal space of the filter element 4 through its outlet pipe 11 under the power of the first exhaust mechanism 2. Since the outlet pipe 11 is located inside the filter element 4, it can reduce noise. Then, the air inside the filter element 4 passes through the filter element 4 under the power of the second exhaust mechanism 6, is filtered and purified, enters the duct 7, and then returns to the car interior from the outlet of the second exhaust mechanism 6. Through this cycle, the air inside the car is continuously purified. With the combined action of the muffler 3 and the muffler assembly 8, the noise generated by the first exhaust mechanism 2 and the second exhaust mechanism 6 during operation can be significantly reduced.

[0032] In another technical solution, the silencer 3 includes a fixed cylinder 32 that is fixed to the first exhaust mechanism 2 circumferentially via a fixing plate 31, and an annular first silencer plate 33 laid on the inner wall of the fixed cylinder 32. The other end of the fixed cylinder 32 is fixed to the end face of the filter element part 4. The fixing plate 31 is used to fix and seal the front end of the fixed cylinder 32, forming a sealed space. The first silencer plate 33 is made of polyester fiberboard or metal flame-retardant sound-absorbing and sound-insulating board, providing good sound insulation.

[0033] In another technical solution, the filter element 4 includes a hollow, near-cylindrical first perforated plate 41 and a second perforated plate 42 spaced apart, and an electret nanofiber membrane 43 filled between the first perforated plate 41 and the second perforated plate 42. The first perforated plate 41 and the second perforated plate 42 provide support and restraint for the electret nanofiber membrane 43, maintaining its preset shape and position, thereby ensuring uniform and stable filtration area and filtration resistance, and improving filtration efficiency. The electret nanofiber membrane 43 can store a large amount of charge on its fibers and achieve long-term stable preservation. It can also form an electric field around the filter material, capturing fine pollutants in the air through electrostatic force, thus isolating fine pollutants and achieving air purification. Since changing the filtration efficiency of the electret nanofiber membrane 43 does not require altering the microstructure of the air filter material, it is possible to improve filtration efficiency while maintaining a lower pressure.

[0034] In another technical solution, both the first perforated plate 41 and the second perforated plate 42 are shaped like a frustum at the front end and a cylinder at the rear end, wherein the diameter of the frustum at the front end gradually decreases along the airflow direction. The shape of the larger front end and smaller rear end matches the airflow pattern. This structural design is intended to reduce airflow resistance, improve filtration efficiency, and, because it conforms to the airflow dynamics, reduce vibration noise caused by airflow.

[0035] In another technical solution, the air duct 7 includes a cylindrical air-receiving duct 71 sleeved on the outside of the filter element 4 and a frustum-shaped air guide duct 72 connected to the air inlet end of the second exhaust mechanism 6. Besides adapting to the structure with a small air inlet area of ​​the second exhaust structure, the combination of the air-receiving duct 71 and the air guide duct 72 facilitates the formation of exhaust airflow for the filter element 4, improving exhaust efficiency.

[0036] In another technical solution, the silencing component 8 includes an annular second silencing plate 81 laid on the inner wall of the air duct 71, a fixing sleeve 82 spaced between the outer side of the air duct 71 and the outer side of the air guide duct 72, and silencing material 83 filled within the fixing sleeve 82. The second silencing plate 81 can be made of polyester fiberboard, metal flame-retardant sound-absorbing and sound-insulating board, perforated gypsum sound-absorbing board, etc. The fixing sleeve 82 forms a closed cavity with the outer side of the air duct 71 and the air guide duct 72 to accommodate the silencing material 83, which is typically made of sound-absorbing cotton, slag wool, corrugated sponge, expanding foam, etc. This provides outstanding silencing efficiency.

[0037] To further enhance the noise reduction effect on the airflow, multiple noise reduction protrusions 84 are spaced apart on the second noise reduction plate 81, and the noise reduction protrusions 84 are inclined along the airflow direction.

[0038] In another technical solution, the exhaust pipe 11 of the first exhaust mechanism 2 is provided with a baffle 12 with multiple strip-shaped holes spaced radially, and a pre-filter material layer 13 is applied to the baffle 12. To reduce the replacement cycle of the filter element 4, the baffle 12 and the pre-filter material layer 13 are installed on the exhaust pipe 11 for preliminary air filtration and purification. After installation, only the pre-filter material layer 13 needs to be replaced in a short period, while the replacement cycle of the filter element 4 is significantly extended. Compared to when the pre-filter material layer 13 is not installed, the replacement cycle of the filter element 4 can be extended by 6 to 10 months. The pre-filter material layer 13 can be made of activated carbon or glass fiber paper.

[0039] In another technical solution, a support base 9 is also included, the top of which is fixed to the bottom of the silencer 3 and the bottom of the fixing sleeve 82 via a support frame 10. The support base 9 improves the stability of the entire air filtration device and reduces vibration noise. Multiple suction cups can also be installed at the bottom of the support base 9 to enhance stability. The support frame 10 can be composed of a pair of figure-eight brackets, resulting in a simple and stable support structure.

[0040] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An air filtration device, characterized in that, include: The power air intake includes a first exhaust mechanism and a silencer disposed circumferentially in the first exhaust mechanism; The filter element is hollow and cylindrical, with both ends closed. The air outlet pipe of the first exhaust mechanism is sealed through one end of the filter element and extends into the interior of the filter element. The power exhaust unit includes a second exhaust mechanism, an exhaust pipe, and a silencer assembly disposed on the exhaust pipe. The exhaust pipe is gap-sealed and sleeved around the filter element. The exhaust end of the exhaust pipe is sealed and connected to the air inlet end of the second exhaust mechanism. The silencer includes a fixed cylinder that is fixed to the circumference of the first exhaust mechanism through a gap in the fixed plate, and an annular first silencer plate laid on the inner side wall of the fixed cylinder, wherein the other end of the fixed cylinder is fixed to the end face of the filter element. The filter element includes a hollow, near-cylindrical first perforated plate and a second perforated plate spaced apart, and an electret nanofiber membrane filling the space between the first perforated plate and the second perforated plate. Both the first orifice plate and the second orifice plate are shaped like a frustum at the front end and a cylinder at the rear end, wherein the diameter of the frustum at the front end gradually decreases along the airflow direction; The air intake pipe includes a cylindrical air-receiving pipe sleeved outside the filter element and a frustum-shaped air guide pipe connected to the air inlet end of the second exhaust mechanism. The sound-absorbing assembly includes an annular second sound-absorbing plate laid on the inner wall of the air duct, a fixing sleeve gapped on the outer side of the air duct and the outer side of the air guide pipe, and sound-absorbing material filled in the fixing sleeve; The second silencing plate is provided with a plurality of silencing protrusions spaced apart, and the silencing protrusions are inclined along the airflow direction.

2. The air filtration device as described in claim 1, characterized in that, The first exhaust mechanism has a baffle with multiple strip-shaped holes spaced radially on its exhaust pipe, and a primary filter material layer is applied to the baffle.

3. The air filtration device as described in claim 1, characterized in that, It also includes a support base, the top of which is fixed to the bottom of the muffler and the bottom of the fixing sleeve by a support frame.

Images