A low-resistance, high-efficiency oil fume filter

Abstract

This utility model discloses a low-resistance, high-efficiency oil fume filter, aiming to provide a low-resistance, high-efficiency oil fume filter that can effectively improve the problem of oil-water mixtures easily accumulating on the filter material layer, leading to a sharp decrease in the air permeability of the filter material layer, thereby extending the service life of the oil fume filter and reducing the energy consumption of the range hood. It includes: a shell, including a top cover, an outer frame located at the edge of the top cover, and an inner frame located inside the outer frame, with an annular groove formed between the outer frame and the inner frame, and a plurality of guide ports connected to the annular groove on the top of the inner frame, and a support mesh on the top cover; a bottom grille, including a plurality of grille bars connected to the bottom of the inner frame, with guide grooves on the grille bars opening upwards and communicating with the annular groove; and a filter structure located inside the inner frame, including a water-absorbing and oil-absorbing guide layer, an intermediate filter layer, and a bottom filter layer distributed in sequence, with the water-absorbing and oil-absorbing guide layer located at the top of the inner frame, and the bottom filter layer supported on the bottom grille.

Description

Technical Field

[0001] This utility model relates to the field of oil fume filtration technology, specifically to a low-resistance, high-efficiency oil fume filter. Background Technology

[0002] With rising living standards and increasing environmental and health awareness, range hoods have become almost standard equipment in household kitchens. The majority of the fumes, water vapor, and other harmful gases produced during cooking are directly discharged into the outdoor air by these range hoods. While this improves the indoor living environment, it also pollutes the outdoor air.

[0003] To reduce or avoid pollution and impact on outdoor air quality from cooking fumes and dust particles, some range hoods now incorporate fume filters. These filters remove cooking fumes before venting them outdoors. For example, Chinese Patent Publication No. CN101376074A describes a glass fiber fume filter felt, comprising a multi-layered, three-dimensional mesh structure of upper, middle, and lower layers. The filter materials in range hoods require high-quality materials, demanding both excellent fume adsorption and breathability to prevent excessive air pressure loss, which would increase the range hood's load and energy consumption. While current range hood filter materials meet the requirements for both adsorption and breathability, oil-water mixtures tend to accumulate on the filter layer during use. This drastically reduces the filter's breathability, increasing the range hood's load and energy consumption, shortening the filter's lifespan, and leading to the release of cooking fumes into indoor environments (such as kitchens and dining rooms). Utility Model Content

[0004] The purpose of this invention is to provide a low-resistance, high-efficiency oil fume filter that can effectively improve the problem that oil-water mixtures easily accumulate on the filter material layer, leading to a sharp decrease in the air permeability of the filter material layer. This extends the service life of the oil fume filter, reduces the energy consumption of the range hood, and helps to quickly purify indoor air.

[0005] The technical solution of this utility model is: A low-resistance, high-efficiency oil fume filter, comprising: The outer shell includes a top cover, an outer frame located at the edge of the top cover, and an inner frame located inside the outer frame. An annular groove is formed between the outer frame and the inner frame. The top of the inner frame is provided with several guide ports that communicate with the annular groove. A support net is provided on the top cover. The bottom grille includes several grille bars connected to the bottom of the inner frame. Each grille bar has an upward-facing guide groove communicating with an annular groove. The filter structure located within the inner frame includes a sequentially distributed water and oil absorption guide layer, a middle filter layer, and a bottom filter layer. The water and oil absorption guide layer is located at the top of the inner frame, and the bottom filter layer is supported on the bottom grille. In actual use, this low-resistance, high-efficiency oil fume filter allows oil fumes to pass sequentially through the support mesh, the water and oil absorption guide layer, the middle filter layer, and the bottom filter layer before being discharged into the outdoor air, thereby effectively reducing or avoiding pollution and impact on outdoor air from oil fume dust particles. Meanwhile, in actual use, the oil, water, and oil-water mixture filtered in the water-absorbing and oil-guiding layer can be promptly guided into the annular groove through the guide channel; the bottom filter layer is supported on the bottom grid, and the oil, water, and oil-water mixture filtered in the bottom filter layer will leak into the guide channel through the part of the bottom filter layer in contact with the grid bars, and then be guided into the annular groove through the guide channel; thus, it effectively improves the problem that oil-water mixtures easily accumulate on the filter material layer, causing a sharp decrease in the air permeability of the filter material layer, effectively reducing the air permeability resistance of the fume filter and extending the service life of the fume filter; at the same time, it can also reduce the energy consumption of the range hood, improve the oil fume adsorption efficiency, and help to quickly purify the indoor air environment, thereby reducing the harm of oil fumes to the human body.

[0006] Preferably, the edge of the water-absorbing and oil-absorbing guide layer is provided with several guide sections corresponding to the guide ports. The guide sections extend outward from the edge of the water-absorbing and oil-absorbing guide layer and extend into the corresponding guide ports. In this way, not only can the water-absorbing and oil-absorbing guide layer be positioned at the top of the inner frame by the cooperation of the guide sections and guide ports, but also the oil, water, and oil-water mixture filtered in the water-absorbing and oil-absorbing guide layer can be guided in a timely manner through the guide groove to the annular groove, further improving the air permeability of the water-absorbing and oil-absorbing guide layer and extending its service life.

[0007] Preferably, the bottom filter layer is composed of a corrugated, pleated filter layer with several parallel, upward-facing bottom guide channels. In this way, the oil, water, and oil-water mixture filtered in the bottom filter layer will collect at the bottom of the bottom guide channels. This collected oil, water, and oil-water mixture will flow along the bottom guide channels and then leak into the flow channels through the contact points between the bottom filter layer and the grid bars. This allows more oil, water, and oil-water mixture in the bottom filter layer to be discharged into the flow channels more promptly, thereby further improving the air permeability of the bottom filter layer and extending its service life. Furthermore, the corrugated, pleated design of the bottom filter layer also effectively increases the surface area of ​​the filter material, further improving the filtration effect.

[0008] Preferably, the intermediate filter layer is composed of a corrugated, pleated filter layer, with the folding direction of the intermediate filter layer perpendicular to that of the bottom filter layer. Several parallel, upward-facing intermediate guide channels are formed on the intermediate filter layer. In this way, the oil, water, and oil-water mixture filtered in the intermediate filter layer will collect at the bottom of the intermediate guide channels. This collected oil, water, and oil-water mixture will flow along the intermediate guide channels and then leak through the contact area between the intermediate filter layer and the bottom filter layer, allowing more oil, water, and oil-water mixture in the intermediate filter layer to be discharged to the bottom filter layer more promptly. This further improves the air permeability of the intermediate filter layer and extends its service life. Furthermore, the corrugated, pleated design of the intermediate filter layer effectively increases the surface area of ​​the filter material, thereby further improving the filtration effect.

[0009] Preferably, the bottom surface of the guide channel is arc-shaped, with the center of the bottom surface bulging upwards and the bottom surfaces at both ends extending downwards. Both ends of the guide channel are connected to the annular groove. In this way, oil, water, and oil-water mixtures that leak from the bottom filter layer into the guide channel will be quickly guided through both ends of the guide channel into the annular groove, effectively preventing the accumulation of oil, water, and oil-water mixtures in the guide channel.

[0010] Preferably, the support mesh is located above the filter structure and is detachable. The top cover has a support mesh mounting port in the center, one side of which connects to one side of the top cover to form a support mesh insertion port. Slots are provided on opposite sides of the support mesh mounting port. The support mesh has a frame, and protruding ribs that mate with the slots are provided on opposite sides of the frame. The support mesh is inserted into the support mesh mounting port through the insertion port, with the protruding ribs inserted into the slots. This facilitates the installation, removal, and cleaning of the support mesh.

[0011] Preferably, the slot has a C-shaped cross-section, the rib also has a C-shaped cross-section, and the upper surface of the frame is flush with the upper surface of the top cover.

[0012] Preferably, the water-absorbing and oil-guiding layer, the intermediate filter layer, and the bottom filter layer are all composed of an upper fiber mesh, a middle mesh fabric, and a lower fiber mesh. One side of the upper and lower fiber meshes is flat, while the other side is a fluffy, protruding surface. The flat sides of the upper and lower fiber meshes all face outwards, while the protruding surfaces face the intermediate filter layer. Because the flat sides of the upper and lower fiber meshes in the water-absorbing and oil-guiding layer, the intermediate filter layer, and the bottom filter layer all face outwards, it facilitates the flow and discharge of oil, water, and oil-water mixtures along the flat surfaces on the surfaces of these layers. Because the upper and lower fiber meshes have fluffy, protruding surfaces, and these protruding surfaces all face the middle filter layer, a three-dimensional spatial structure can be formed within the water and oil absorption guiding layer, the middle filter layer, and the bottom filter layer. This effectively improves the oil fume adsorption efficiency and air permeability. Furthermore, the presence of a middle mesh fabric between the upper and lower fiber meshes allows the oil, water, and oil-water mixtures adsorbed in the water and oil absorption guiding layer, the middle filter layer, and the bottom filter layer to be guided away more readily and efficiently through the horizontal and vertical meshes in the middle mesh fabric. This further enhances the oil fume adsorption efficiency and air permeability of the water and oil absorption guiding layer, the middle filter layer, and the bottom filter layer.

[0013] Preferably, the upper and lower fiber webs are made of a fiber blend with an average fiber fineness of 16-26D, a web weight of 20-50 g / m², and a thickness of 1.0-2.0 mm. This design further ensures the oil fume adsorption efficiency and air permeability of both the upper and lower fiber webs.

[0014] Preferably, the middle mesh fabric is woven from yarn and has a mesh structure with square or diamond-shaped mesh openings, each 6-10mm × 6-10mm in size. The yarn fineness of the middle mesh fabric is 700-1100D. This allows the flow-guiding function of the horizontal and vertical meshes in the middle mesh fabric to facilitate the discharge of more oil, water, and oil-water mixtures more efficiently and promptly. This further improves the oil fume adsorption efficiency and air permeability of the water and oil absorption guiding layer, the middle filter layer, and the bottom filter layer.

[0015] The beneficial effects of this invention are as follows: In actual use, the oil fumes pass sequentially through the support mesh, the water and oil absorption guiding layer, the intermediate filter layer, and the bottom filter layer before being discharged into the outdoor air, thereby effectively reducing or avoiding pollution and impact on outdoor air from oil fume dust particles. Simultaneously, during actual use, the oil, water, and oil-water mixture filtered in the water and oil absorption guiding layer can be promptly guided into the annular groove through the guide channel; the bottom filter layer is supported on the bottom grid, and the oil, water, and oil-water mixture filtered in the bottom filter layer will leak into the guide channel through the contact area between the bottom filter layer and the grid bars, and then be guided into the annular groove through the guide channel; thus effectively improving the problem of oil-water mixtures easily accumulating on the filter material layer, leading to a sharp decrease in the air permeability of the filter material layer, effectively reducing the air permeability resistance of the oil fume filter, and extending the service life of the oil fume filter; at the same time, it can also reduce the energy consumption of the range hood, improve the oil fume adsorption efficiency, and facilitate the rapid purification of indoor air, thereby reducing the harm of oil fumes to the human body. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of a low-resistance, high-efficiency oil fume filter according to the present invention.

[0017] Figure 2 This is a three-dimensional structural schematic diagram of a low-resistance, high-efficiency oil fume filter according to this utility model from a certain perspective.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of a low-resistance, high-efficiency oil fume filter according to this utility model, from another perspective.

[0019] In the picture: 1. Outer shell, 1.1. Top cover, 1.2. Outer frame, 1.3. Inner frame, 1.4. Annular groove, 1.5. Flow guide port; Support mesh 2, border 2.1; Bottom grille 3, grille bars 3.1, flow guide groove 3.2; The filter structure 4 consists of a water and oil absorption guide layer 4.1, an intermediate filter layer 4.2, a bottom filter layer 4.3, and a guide section 4.4. Detailed Implementation

[0020] Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, a low-resistance, high-efficiency oil fume filter includes a housing 1, a bottom grille 3, and a filter structure 4.

[0021] The outer casing 1 includes a top cover 1.1, an outer frame 1.2 located at the edge of the top cover 1.1, and an inner frame 1.3 located within the outer frame 1.2. A support mesh 2 is provided on the top cover 1.1. The support mesh 2 is located above the filter structure 4. The outer frame 1.2 and the inner frame 1.3 are located below the top cover 1.1. An annular groove 1.4 is formed between the outer frame 1.2 and the inner frame 1.3. The annular groove 1.4 surrounds the outer frame 1.2 and the inner frame 1.3. The top of the inner frame 1.3 is provided with several guide ports 1.5 communicating with the annular groove 1.4, and the guide ports 1.5 connect to the inner and outer sides of the inner frame 1.3. The top surface of the inner frame 1.3 is connected to the top cover 1.1.

[0022] The bottom grille 3 includes several grille bars 3.1 connected to the bottom of the inner frame 1.3. Each grille bar 3.1 has an upward-facing guide groove 3.2. The guide groove 3.2 communicates with the annular groove 1.4. Specifically, at least one end of the guide groove 3.2 is connected to the annular groove 1.4.

[0023] The filter structure 4 is located within the inner frame 1.3. The filter structure 4 includes a water-absorbing and oil-absorbing guide layer 4.1, a middle filter layer 4.2, and a bottom filter layer 4.3, arranged sequentially from top to bottom. The water-absorbing and oil-absorbing guide layer 4.1 is located at the top of the inner frame 1.3. The bottom filter layer 4.3 is supported on the bottom grille 3.

[0024] In actual use, the low-resistance, high-efficiency oil fume filter of this embodiment allows oil fumes to pass sequentially through the support mesh 2, the water and oil absorption guide layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3 before being discharged into the outdoor air, thereby effectively reducing or avoiding pollution and impact on outdoor air from oil fume dust particles. Meanwhile, in actual use, the oil, water, and oil-water mixture filtered in the water-absorbing and oil-guiding layer 4.1 can be promptly guided to the annular groove 1.4 through the guiding groove 3.2; the bottom filter layer 4.3 is supported on the bottom grille 3, and the oil, water, and oil-water mixture filtered in the bottom filter layer 4.3 will leak into the guiding groove 3.2 through the part where the bottom filter layer 4.3 contacts the grille 3.1. The oil, water, and oil-water mixture filtered in the bottom filter layer 4.3 are then guided to the annular groove 1.4 through the guiding groove 3.2. This effectively improves the problem that oil-water mixtures easily accumulate on the filter material layer, causing a sharp decrease in the air permeability of the filter material layer, effectively reducing the air permeability resistance of the fume filter and extending the service life of the fume filter; at the same time, it can also reduce the energy consumption of the range hood, improve the fume adsorption efficiency, and help to quickly purify the indoor air environment, so as to reduce the harm of fume to the human body.

[0025] Specific embodiment two, such as Figure 1 , Figure 2 As shown, a low-resistance, high-efficiency oil fume filter includes a housing 1, a bottom grille 3, and a filter structure 4.

[0026] The outer casing 1 includes a top cover 1.1, an outer frame 1.2 located at the edge of the top cover 1.1, and an inner frame 1.3 located within the outer frame 1.2. A support mesh 2 is provided on the top cover 1.1. The support mesh 2 is located above the filter structure 4. The outer frame 1.2 and the inner frame 1.3 are located below the top cover 1.1. An annular groove 1.4 is formed between the outer frame 1.2 and the inner frame 1.3. The annular groove 1.4 surrounds the outer frame 1.2 and the inner frame 1.3. The top of the inner frame 1.3 is provided with several guide ports 1.5 communicating with the annular groove 1.4, and the guide ports 1.5 connect to the inner and outer sides of the inner frame 1.3. The top surface of the inner frame 1.3 is connected to the top cover 1.1.

[0027] The bottom grille 3 includes several grille bars 3.1 connected to the bottom of the inner frame 1.3. Each grille bar 3.1 has an upward-facing guide groove 3.2. The guide groove 3.2 communicates with the annular groove 1.4; specifically, at least one end of the guide groove 3.2 communicates with the annular groove 1.4. In this embodiment, the grille bars 3.1 are distributed in parallel.

[0028] The filter structure 4 is located within the inner frame 1.3. The filter structure 4 includes a water-absorbing and oil-absorbing guide layer 4.1, a middle filter layer 4.2, and a bottom filter layer 4.3, arranged sequentially from top to bottom. The water-absorbing and oil-absorbing guide layer 4.1 is located at the top of the inner frame 1.3. The middle filter layer 4.2 is supported on the bottom filter layer 4.3. The bottom filter layer 4.3 is supported on the bottom grille 3.

[0029] In actual use, the low-resistance, high-efficiency oil fume filter of this embodiment allows oil fumes to pass sequentially through the support mesh 2, the water and oil absorption guide layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3 before being discharged into the outdoor air, thereby effectively reducing or avoiding pollution and impact on outdoor air from oil fume dust particles. Meanwhile, in actual use, the oil, water, and oil-water mixture filtered in the water-absorbing and oil-guiding layer 4.1 can be promptly guided to the annular groove 1.4 through the guiding groove 3.2; the bottom filter layer 4.3 is supported on the bottom grille 3, and the oil, water, and oil-water mixture filtered in the bottom filter layer 4.3 will leak into the guiding groove 3.2 through the part where the bottom filter layer 4.3 contacts the grille 3.1. The oil, water, and oil-water mixture filtered in the bottom filter layer 4.3 are then guided to the annular groove 1.4 through the guiding groove 3.2. This effectively improves the problem that oil-water mixtures easily accumulate on the filter material layer, causing a sharp decrease in the air permeability of the filter material layer, effectively reducing the air permeability resistance of the fume filter and extending the service life of the fume filter; at the same time, it can also reduce the energy consumption of the range hood, improve the fume adsorption efficiency, and help to quickly purify the indoor air environment, so as to reduce the harm of fume to the human body.

[0030] Furthermore, the support net 2 is a detachable structure. Specifically, the top cover 1.1 has a support net 2 mounting port in the middle. One side of the support net 2 mounting port is connected to one side of the top cover 1.1 to form a support net 2 insertion port. Slots are provided on opposite sides of the support net 2 mounting port. The support net 2 has a frame 2.1 at its edge. Raised ribs that mate with the slots are provided on opposite sides of the frame 2.1 of the support net 2. The support net 2 is inserted into the support net 2 mounting port through the support net 2 insertion port, and the raised ribs are inserted into the slots. This facilitates the installation, removal, and cleaning of the support net 2.

[0031] In this embodiment, the slot has a C-shaped cross-section, the rib also has a C-shaped cross-section, and the upper surface of the frame is flush with the upper surface of the top cover 1.1. It should be noted that the slot's cross-section can also be square, V-shaped, or other shapes, with the rib's cross-section matching the slot's cross-section.

[0032] Furthermore, the edge of the water-absorbing and oil-absorbing guide layer 4.1 is provided with several guide portions 4.4 corresponding to the guide ports 1.5. The guide portions 4.4 are formed by extending outward from the edge of the water-absorbing and oil-absorbing guide layer 4.1 and extend into the corresponding guide ports 1.5. In this embodiment, the guide ports 1.5 are distributed sequentially along the top edge of the inner frame 1.3, and the guide portions 4.4 correspond one-to-one with the guide ports 1.5. In this way, not only can the water-absorbing and oil-absorbing guide layer 4.1 be positioned at the top of the inner frame 1.3 by the cooperation of the guide portions 4.4 and the guide ports 1.5, but also the oil, water, and oil-water mixture filtered in the water-absorbing and oil-absorbing guide layer 4.1 can be timely guided through the guide groove 3.2 to the annular groove 1.4 by the guide portions 4.4, further improving the air permeability of the water-absorbing and oil-absorbing guide layer 4.1 and extending its service life.

[0033] Furthermore, the bottom filter layer 4.3 is composed of a wavy, folded filter layer, with several parallel, upward-facing bottom guide grooves formed on it. In this embodiment, the bottom guide grooves are V-shaped, and their length direction is perpendicular to the length direction of the grid bars 3.1. Thus, the oil, water, and oil-water mixture filtered in the bottom filter layer 4.3 will accumulate at the bottom of the bottom guide grooves. This accumulated oil, water, and oil-water mixture will flow along the bottom guide grooves and then leak through the contact area between the bottom filter layer 4.3 and the grid bars 3.1 into the guide groove 3.2. This allows more oil, water, and oil-water mixture in the bottom filter layer 4.3 to be discharged into the guide groove 3.2 more promptly, thereby further improving the air permeability of the bottom filter layer 4.3 and extending its service life. On the other hand, the bottom filter layer 4.3 is composed of a wavy folded filter layer, which can effectively increase the filter material area of ​​the bottom filter layer 4.3, thereby further improving the filtration effect of the bottom filter layer 4.3.

[0034] Furthermore, the intermediate filter layer 4.2 is composed of a wavy, folded filter layer, and the folding direction of the intermediate filter layer 4.2 is perpendicular to the folding direction of the bottom filter layer 4.3. Several parallel, upward-facing intermediate guide channels are formed on the intermediate filter layer 4.2. In this embodiment, the intermediate guide channels are V-shaped, and the length direction of the intermediate guide channels is perpendicular to the length direction of the bottom guide channels. Thus, the oil, water, and oil-water mixture filtered in the intermediate filter layer 4.2 will accumulate at the bottom of the intermediate guide channels. This accumulated oil, water, and oil-water mixture will flow along the intermediate guide channels and then leak through the contact area between the intermediate filter layer 4.2 and the bottom filter layer 4.3 to the bottom filter layer 4.3. This allows more oil, water, and oil-water mixture in the intermediate filter layer 4.2 to be discharged to the bottom filter layer 4.3 more promptly, thereby further improving the air permeability of the intermediate filter layer 4.2 and extending its service life. On the other hand, the intermediate filter layer 4.2 is composed of a wavy folded filter layer, which can effectively increase the filter material area of ​​the intermediate filter layer 4.2, thereby further improving the filtration effect of the intermediate filter layer 4.2.

[0035] In this embodiment, the number of bottom guide grooves in the bottom filter layer 4.3 is greater than the number of middle guide grooves in the middle filter layer 4.2.

[0036] Furthermore, the bottom surface of the guide channel 3.2 is arc-shaped, with the center of the bottom surface of the guide channel 3.2 bulging upwards and the bottom surfaces at both ends of the guide channel 3.2 extending downwards. Both ends of the guide channel 3.2 are connected to the annular groove 1.4. In this way, oil, water, and oil-water mixtures that leak from the bottom filter layer 4.3 into the guide channel 3.2 will be quickly guided through both ends of the guide channel 3.2 into the annular groove 1.4, effectively preventing the accumulation of oil, water, and oil-water mixtures in the guide channel 3.2.

[0037] In this specific embodiment, the remaining structure is the same as in specific embodiment one or specific embodiment two, except that... The filter materials of the water-absorbing and oil-absorbing flow guide layer 4.1, the intermediate filter layer 4.2, and the bottom filter layer 4.3 are all composed of an upper fiber mesh, a middle mesh fabric, and a lower fiber mesh. Specifically, the water-absorbing and oil-absorbing flow guide layer 4.1 consists of an upper fiber mesh, a middle mesh fabric, and a lower fiber mesh. The intermediate filter layer 4.2 consists of an upper fiber mesh, a middle mesh fabric, and a lower fiber mesh. The bottom filter layer 4.3 consists of an upper fiber mesh, a middle mesh fabric, and a lower fiber mesh.

[0038] One side of both the upper and lower fiber webs is flat, while the other side has fluffy, protruding surfaces. The flat surfaces of both the upper and lower fiber webs face outwards, i.e., the flat surfaces of the upper fiber web face upwards, and the flat surfaces of the lower fiber web face downwards. The protruding surfaces of both the upper and lower fiber webs face towards the intermediate filter layer 4.2. Because the flat surfaces of the upper and lower fiber webs in the water and oil absorption guiding layer 4.1, the intermediate filter layer 4.2, and the bottom filter layer 4.3 all face outwards, it facilitates the flow and discharge of oil, water, and oil-water mixtures along the flat surfaces on the surfaces of these layers. Because the upper and lower fiber webs have fluffy, protruding surfaces, and these protruding surfaces all face the middle filter layer 4.2, a three-dimensional spatial structure can be formed in the water and oil absorption guiding layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3, thereby effectively improving the oil fume adsorption efficiency and air permeability. Since there is a middle mesh fabric between the upper and lower fiber webs, the oil, water, and oil-water mixtures adsorbed in the water and oil absorption guiding layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3 can be guided by the horizontal and vertical meshes in the middle mesh fabric, allowing more oil, water, and oil-water mixtures to be discharged more quickly and efficiently, further improving the oil fume adsorption efficiency and air permeability of the water and oil absorption guiding layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3.

[0039] In Specific Embodiment Four, the remaining structure is the same as in Specific Embodiment Three, except that both the upper and lower fiber webs are made of fiber blends. The average fiber fineness is 16-26D. The basis weight of the upper fiber web is 20-50 g / m², the basis weight of the lower fiber web is 20-50 g / m², the thickness of the upper fiber web is 1.0-2.0 mm, and the thickness of the lower fiber web is 1.0-2.0 mm.

[0040] The middle layer mesh fabric is woven from yarn. It has a mesh structure with square or diamond-shaped openings. The mesh size is 6-10mm × 6-10mm, and the yarn fineness is 700-1100D.

[0041] In this embodiment, the upper and lower fiber meshes can further ensure the oil fume adsorption efficiency and air permeability of the upper and lower fiber meshes.

[0042] This embodiment utilizes the flow-guiding function of the horizontal and vertical grids in the middle layer of the mesh fabric to allow more oil, water, and oil-water mixtures to be discharged and guided away more promptly, thereby further improving the oil fume adsorption efficiency and air permeability of the water and oil absorption guiding layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3.

[0043] The table below shows experiments conducted on filter materials with different parameters for the water-absorbing and oil-absorbing guide layer 4.1, the middle filter layer 4.2, and the bottom filter layer 4.3. The air permeability (i.e., air density) and oil fume adsorption efficiency of these filter materials were tested. The experimental results are shown in the table below. The experimental results in the table show that the filter materials in Experiments 1-9 have good oil fume adsorption efficiency and air permeability. Among them, the average fiber fineness D of Comparative Example 1 decreased to 7, resulting in a significant decrease in air permeability; the average fiber fineness D of Comparative Example 2 increased to 30, resulting in a significant decrease in oil fume filtration efficiency; the yarn fineness of the middle layer mesh fabric in Comparative Example 3 decreased to 500, which had a certain impact on oil fume filtration efficiency; and the yarn fineness of the middle layer mesh fabric in Comparative Example 4 increased to 1200, which had a significant impact on oil fume filtration efficiency.

[0044] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A low-resistance, high-efficiency oil fume filter, characterized in that, include: The outer shell includes a top cover, an outer frame located at the edge of the top cover, and an inner frame located inside the outer frame. An annular groove is formed between the outer frame and the inner frame. The top of the inner frame is provided with several guide ports that communicate with the annular groove. A support net is provided on the top cover. The bottom grille includes several grille bars connected to the bottom of the inner frame, and the grille bars are provided with guide grooves with upward openings and communicating with annular grooves; The filter structure located within the inner frame includes a water-absorbing and oil-absorbing guide layer, a middle filter layer, and a bottom filter layer arranged sequentially. The water-absorbing and oil-absorbing guide layer is located at the top of the inner frame, and the bottom filter layer is supported on the bottom grid.

2. The low-resistance, high-efficiency oil fume filter according to claim 1, characterized in that, The edge of the water-absorbing and oil-absorbing guide layer is provided with several guide sections corresponding to the guide ports. The guide sections are formed by extending outward from the edge of the water-absorbing and oil-absorbing guide layer and extending into the corresponding guide ports.

3. The low-resistance, high-efficiency oil fume filter according to claim 1, characterized in that, The bottom filter layer is composed of a wavy, folded filter layer, with several side-by-side bottom guide grooves facing upwards.

4. The low-resistance, high-efficiency oil fume filter according to claim 3, characterized in that, The intermediate filter layer is composed of a wavy folded filter layer, and the folding direction of the intermediate filter layer is perpendicular to the folding direction of the bottom filter layer. Several parallel, upward-facing intermediate guide grooves are formed on the intermediate filter layer.

5. A low-resistance, high-efficiency oil fume filter according to claim 1, 2, 3, or 4, characterized in that, The bottom surface of the guide channel is arc-shaped, with the middle of the bottom surface of the guide channel bulging upwards and the bottom surfaces at both ends of the guide channel extending downwards. Both ends of the guide channel are connected to the annular groove.

6. A low-resistance, high-efficiency oil fume filter according to claim 1, 2, 3, or 4, characterized in that, The support mesh is located above the filter structure. The support mesh is a detachable structure. The top cover has a support mesh installation port in the middle. One side of the support mesh installation port is connected to one side of the top cover to form a support mesh insertion port. The opposite sides of the support mesh installation port have slots. The edge of the support mesh has a frame. The opposite sides of the frame of the support mesh have protruding ribs that cooperate with the slots. The support mesh is inserted into the support mesh installation port through the support mesh insertion port, and the protruding ribs are inserted into the slots.

7. A low-resistance, high-efficiency oil fume filter according to claim 6, characterized in that, The slot has a C-shaped cross-section, the rib also has a C-shaped cross-section, and the upper surface of the frame is flush with the upper surface of the top cover.

8. A low-resistance, high-efficiency oil fume filter according to claim 1, 2, 3, or 4, characterized in that, The water-absorbing and oil-absorbing guide layer, the middle filter layer, and the bottom filter layer are all composed of an upper fiber mesh, a middle mesh cloth, and a lower fiber mesh. One side of the upper and lower fiber mesh is a flat surface, and the other side of the upper and lower fiber mesh is a fluffy, protruding surface. The flat surfaces of the upper and lower fiber meshes all face outwards, and the protruding surfaces of the upper and lower fiber meshes all face the middle filter layer.

9. A low-resistance, high-efficiency oil fume filter according to claim 8, characterized in that, The upper and lower fiber webs are made of blended fibers with an average fiber fineness of 16-26D. The basis weight of the upper fiber web is 20-50 g / m2, the basis weight of the lower fiber web is 20-50 g / m2, the thickness of the upper fiber web is 1.0-2.0 mm, and the thickness of the lower fiber web is 1.0-2.0 mm.

10. A low-resistance, high-efficiency oil fume filter according to claim 8, characterized in that, The middle layer mesh fabric is woven from yarn and has a mesh structure. The mesh openings of the middle layer mesh fabric are square or diamond-shaped, with a mesh size of 6-10mm × 6-10mm. The yarn fineness of the middle layer mesh fabric is 700-1100D.

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