Composite filter screen of range hood with air purification function

Abstract

The utility model discloses a kind of composite filter screen of range hood with air purification function, it is related to range hood technical field, including installation frame, three layers of detachable filter screen are sequentially provided in frame along air flow direction, filter screen is distributed along the width direction of frame with interval;Detection mechanism is equipped in the inner wall of frame corresponding to the air outlet side of second, third layer filter screen, front end surface is equipped with the prompt light electrically connected with detection mechanism, rear end surface is equipped with magnetic power supply connector;Detection mechanism contains strip-shaped deformation piece, strain gauge, installation shell and wind resistance stick, deformation piece is fixed by installation boss;Filter screen is independently assembled through installation port, installation groove, cooperate with ball head elastic snap pin fixed, handle is equipped in filter screen side edge, frame is equipped with notch in correspondence to facilitate disassembly and assembly.Working, air flow impact wind resistance stick makes deformation piece deformation, strain gauge turns electric signal to prompt light feedback state;Realize filter screen maintenance opportunity accurate judgment and layered independent disassembly, reduce maintenance cost, improve purification and detection stability.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a composite filter for range hoods with air purification function. Background Technology

[0002] In older residential buildings without shared ventilation ducts and open kitchens, range hoods often need to recirculate or exhaust nearby, making the need for both fume interception and air purification more prominent. Composite filters with this dual function have become a suitable choice for these scenarios. However, there are still two issues that need to be addressed in the actual use of current composite filters: First, it is difficult to accurately determine when to maintain the filter. The replacement or cleaning of existing composite filters relies entirely on the user's subjective experience. Users may replace unsaturated filters prematurely due to concerns about purification failure, resulting in material waste and increased maintenance costs. Alternatively, they may delay maintenance due to not noticing filter blockage, leading to decreased oil fume purification efficiency and even problems such as weakened suction power and increased noise in the range hood.

[0003] Secondly, layered filters are "difficult to detect and difficult to disassemble individually." To improve purification efficiency, composite filters often adopt a layered design (such as a pre-filtration layer, a fine filtration layer, and an adsorption layer). However, in the existing structure, the inner filter is blocked by the outer layer, making it impossible for users to observe its clogging or saturation status. Furthermore, there is a lack of independent disassembly and assembly design. Even if an abnormality is detected in the inner layer, it cannot be disassembled and replaced individually. Instead, all filters must be replaced as a whole, further increasing the cost of use. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a composite filter for range hoods with air purification function, thereby solving the problems of difficulty in determining when to maintain existing composite filters, difficulty in perceiving layering, and inability to disassemble and install them individually.

[0005] The technical solution of this utility model is as follows: A composite filter for a range hood with air purification function includes an installation frame. The installation frame is a hollow rectangular frame used to adapt to the range hood duct and provide an installation base for each component. Three detachable filter screens are arranged sequentially along the airflow direction inside the installation frame, and the three filter screens are spaced apart along the width direction of the installation frame.

[0006] On the inner wall of the mounting frame, detection mechanisms for measuring wind speed are respectively provided on the air outlet side of the second layer filter and the air outlet side of the third layer filter. By monitoring the change in wind speed on the air outlet side of the filter, the degree of clogging of the filter can be indirectly determined.

[0007] The front end of the mounting frame is equipped with an indicator light that is electrically connected to the testing mechanism. The indicator light can display the filter status in real time based on the electrical signal output by the testing mechanism (e.g., green light indicates normal operation, red light indicates maintenance required). The rear end of the mounting frame is equipped with a magnetic power supply connector that can magnetically connect to the power supply module of the range hood body, providing wireless power to the testing mechanism and indicator light, thus avoiding interference from wiring during filter installation and removal.

[0008] Furthermore, the three layers of filters, arranged sequentially along the airflow direction, are: a pre-filter layer using stainless steel mesh, which can intercept large oil droplets and food residues in the fumes, playing a role in preliminary purification and protecting the subsequent precision filter; a fine filter layer using HEPA filter material, which can efficiently filter oil fume particles and dust with a particle size ≥2.5μm, achieving fine purification; and an adsorption layer using activated carbon, which can adsorb volatile organic compounds (VOCs) and odor molecules in the fumes, improving the odor of the exhaust air.

[0009] The mounting frame has three mounting openings spaced apart along its width on one side wall. Each of the three mounting openings corresponds to an independent disassembly and assembly path for the three layers of filter screens. Each mounting opening extends along the length of the mounting frame to form a mounting groove. Each mounting groove is detachably fitted with one layer of the filter screen, so that each layer of filter screen can be disassembled and assembled independently, without having to replace all the filter screens due to blockage of a single layer.

[0010] Furthermore, each layer of the filter screen is provided with a ball-head elastic locking pin on its upper and lower ends. The locking pin has elastic expansion and contraction characteristics, and can retract when squeezed and automatically pop out when there is no external force. Each of the mounting slots has a slot on its inner wall that is adapted to engage with the ball-head elastic locking pin. When the filter screen is inserted into the mounting slot, the ball-head elastic locking pin is squeezed and contracted by the slot wall, and automatically pops out and engages when it reaches the slot position, so as to quickly fix the filter screen. When disassembling, applying a pulling force can cause the locking pin to retract and disengage from the slot.

[0011] Furthermore, the mounting frame has notches at the upper and lower ends of the side walls corresponding to each mounting port. Each layer of filter screen extends upward and downward on the side wall corresponding to the mounting port to form a handle. The handle is located in the corresponding notch, which provides operating space for the handle, making it convenient for the user to hold and pull out the filter screen.

[0012] Furthermore, the detection mechanism includes a detection component and a windbreak bar. The detection component is used to sense changes in airflow, and the windbreak bar is used to directly interact with the airflow. The detection component includes strip-shaped deformable sheets symmetrically arranged on both sides of the mounting frame. The deformable sheets are elastic metal sheets that can undergo recoverable deformation under external force. Each strip-shaped deformable sheet has a strain gauge in its middle. The strain gauge is a resistive sensor that can convert the deformation of the deformable sheet into an electrical signal. Each strain gauge has a mounting shell above it, and the windbreak bar is horizontally arranged between the two mounting shells. The windbreak bar is in direct contact with the airflow. When the airflow impacts the windbreak bar, it causes the deformable sheet to deform, which is then detected by the strain gauge and converted into an electrical signal.

[0013] Furthermore, two mounting bosses are provided on both sides of the air outlet side of the second layer filter and on both sides of the air outlet side of the third layer filter within the mounting frame. The mounting bosses provide fixed support points for the deformable sheet, allowing it to be suspended and providing space for the deformable sheet to undergo recoverable deformation. The two mounting bosses are spaced apart along the height direction of the mounting frame. The two ends of the strip-shaped deformable sheet are respectively fixed between the two mounting bosses.

[0014] Furthermore, the wind baffle is arranged horizontally on the air outlet side corresponding to the filter screen, perpendicular to the airflow direction on the air outlet side of the filter screen, so as to interact with the airflow to the greatest extent; and the length of the wind baffle is not less than 80% of the transverse length of the filter screen, which can cover most of the transverse area of ​​the filter screen, ensuring that the airflow flowing through the filter screen can fully act on the wind baffle.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model uses a testing agency to monitor the air velocity on the outlet side of the second and third layer filters in real time, combined with intuitive feedback from indicator lights. This allows users to accurately grasp the filter clogging status, avoiding the waste of materials from "prematurely replacing unsaturated filters" and preventing "delayed maintenance leading to decreased purification efficiency," thus reducing usage and maintenance costs.

[0016] 2. The three-layer filter of this utility model adopts an independent disassembly and assembly structure of "ball head elastic locking pin + installation groove + handle + notch", and each layer can be disassembled, replaced or cleaned separately; and the differentiated design of the function and material of each layer of filter (stainless steel mesh, HEPA, activated carbon) can not only treat different pollutants in a targeted manner, but also make it convenient for users to flexibly maintain according to the actual condition of each layer, further saving the cost of use. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the present utility model.

[0018] Figure 2 This is a schematic diagram of the rear view structure of this utility model.

[0019] Figure 3 This is a disassembly diagram of the present invention.

[0020] Figure 4 For the present utility model Figure 3 Enlarged diagram of point A in the middle.

[0021] Figure 5 This is a schematic diagram of the installation frame and testing mechanism of this utility model.

[0022] Figure 6 This is a disassembly diagram of the detection component and the windbreak bar of this utility model.

[0023] Reference numerals: 1. Mounting frame; 1-1. Mounting port; 1-2. Notch; 1-3. Mounting boss; 2. Filter screen; 2-1. Pre-filter layer; 2-1.1. Elastic ball head latch; 2-1.2. Handle; 2-2. Fine filter layer; 2-3. Adsorption layer; 3. Detection mechanism; 3-1. Detection component; 3-1.1. Strip-shaped deformation plate; 3-1.2. Strain gauge; 3-1.3. Mounting shell; 3-2. Wind baffle; 4. Indicator light; 5. Magnetic power supply connector. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] like Figures 1 to 6 As shown, a composite filter screen for a range hood with air purification function includes an installation frame 1. The installation frame 1 is a hollow rectangular frame used to adapt to the air duct of the range hood and to provide an installation base for each component. Three detachable filter screens 2 are arranged sequentially inside the installation frame 1 along the airflow direction, and the three filter screens 2 are spaced apart along the width direction of the installation frame 1.

[0026] On the inner wall of the mounting frame 1, a detection mechanism 3 for measuring wind speed is provided on the air outlet side of the second layer filter 2 and the air outlet side of the third layer filter 2, respectively. By monitoring the change in wind speed on the air outlet side of the filter, the degree of clogging of the filter can be indirectly determined.

[0027] The front end of the mounting frame 1 is equipped with an indicator light 4 that is electrically connected to the detection mechanism 3. The indicator light 4 can display the filter status in real time according to the electrical signal output by the detection mechanism 3 (e.g., green light indicates normal operation, red light indicates maintenance is required). The rear end of the mounting frame 1 is equipped with a magnetic power connector 5, which can magnetically connect to the power supply module of the range hood body to wirelessly power the detection mechanism 3 and the indicator light 4, avoiding interference from wiring for the installation and removal of the filter 2.

[0028] Furthermore, the three-layer filter 2, along the airflow direction, consists of: a pre-filter layer 2-1 made of stainless steel mesh, which can intercept large oil droplets, food residues, etc. in the fumes, playing a role in preliminary purification and protecting the subsequent precision filter; a fine filter layer 2-2 made of HEPA filter material, which can efficiently filter oil fume particles and dust with a particle size ≥2.5μm, achieving fine purification; and an adsorption layer 2-3 made of activated carbon, which can adsorb volatile organic compounds (VOCs) and odor molecules in the fumes, improving the odor of the exhaust air.

[0029] The mounting frame 1 has three mounting ports 1-1 spaced apart along its width on one side wall. The three mounting ports 1-1 correspond to the independent disassembly and assembly paths of the three layers of filter screens 2. Each mounting port 1-1 extends along the length of the mounting frame 1 to form a mounting groove. Each mounting groove is detachably fitted with a layer of filter screen 2, so that each layer of filter screen can be disassembled and assembled independently, without having to replace all the filter screens due to blockage of a single layer.

[0030] Furthermore, each layer of filter screen 2 has a ball-head elastic locking pin 2-1.1 on its upper and lower ends. The locking pin has elastic expansion and contraction characteristics, and can retract when squeezed and automatically pop out when there is no external force. Each mounting groove has a slot that is adapted to engage with the ball-head elastic locking pin 2-1.1. When the filter screen 2 is inserted into the mounting groove, the ball-head elastic locking pin 2-1.1 is squeezed and contracted by the groove wall, and automatically pops out and engages when it reaches the slot position, so as to quickly fix the filter screen. When disassembling, applying a pulling force can cause the locking pin to retract and disengage from the slot.

[0031] Furthermore, the mounting frame 1 has notches 1-2 at the upper and lower ends of the side wall corresponding to each mounting port 1-1. Each layer of filter screen 2 extends upward and downward on the side wall corresponding to the mounting port 1-1 to form a handle 2-1.2. The handle 2-1.2 is located in the corresponding notch 1-2, and the notch 1-2 provides operating space for the handle 2-1.2. The handle 2-1.2 makes it easy for the user to hold and pull out the filter screen.

[0032] Furthermore, the detection mechanism 3 includes a detection component 3-1 and a wind baffle 3-2. The detection component 3-1 is used to sense changes in airflow, and the wind baffle 3-2 is used to directly interact with the airflow. The detection component 3-1 includes strip-shaped deformable sheets 3-1.1 symmetrically arranged on both sides of the mounting frame 1. The strip-shaped deformable sheets 3-1.1 are elastic metal sheets that can undergo recoverable deformation under external force. Each strip-shaped deformable sheet 3-1.1 has a strain gauge 3-1.2 in the middle. The strain gauge 3-1.2 is a resistive sensor that can convert the deformation of the deformable sheet into an electrical signal. Each strain gauge 3-1.2 has a mounting shell 3-1.3 above it. The wind baffle 3-2 is horizontally arranged between the two mounting shells 3-1.3. The wind baffle 3-2 is in direct contact with the airflow. When the airflow impacts the wind baffle 3-2, it causes the deformable sheet to deform, which is then detected by the strain gauge 3-1.2 and converted into an electrical signal.

[0033] Furthermore, two mounting bosses 1-3 are provided on both sides of the air outlet side of the second layer filter 2 and on both sides of the air outlet side of the third layer filter 2 within the mounting frame 1. The mounting bosses 1-3 provide fixed support points for the deformable sheet, so that the deformable sheet is suspended and provides space for the deformable sheet to undergo recoverable deformation. The two mounting bosses 1-3 are distributed at intervals along the height direction of the mounting frame 1.

[0034] The two ends of the strip-shaped deformable piece 3-1.1 are respectively fixed between the two mounting bosses 1-3.

[0035] Furthermore, the wind baffle 3-2 is set horizontally on the air outlet side of the corresponding filter screen 2, perpendicular to the airflow direction of the air outlet side of the filter screen 2, so as to interact with the airflow to the greatest extent; and the length of the wind baffle 3-2 is not less than 80% of the transverse length of the filter screen 2, which can cover most of the transverse area of ​​the filter screen 2, ensuring that the airflow passing through the filter screen 2 can fully act on the wind baffle 3-2.

[0036] The working principle of this utility model: Maintenance Timing Determination: When the oil fume airflow passes through filter 2, if filter 2 becomes clogged, the airflow speed will change accordingly. In the detection mechanism 3, the air baffle 3-2 is impacted by the airflow, causing the strip-shaped deformation plate 3-1.1 to deform. The strain gauge 3-1.2 captures the deformation and converts it into an electrical signal, which is transmitted to the indicator light 4 (if the airflow speed is below the threshold, the indicator light 4 will light up red). At the same time, the magnetic power connector 5 supplies power to the detection mechanism 3 and the indicator light 4, ensuring the integrity of the installation frame 1 without affecting the ease of disassembly and assembly of filter 2. Through "real-time airflow monitoring + intuitive feedback from indicator light 4", users can accurately grasp the clogging status of the second layer (fine filter layer 2-2) and the third layer (adsorption layer 2-3), avoiding misjudgment of maintenance timing due to subjective experience.

[0037] Layered Sensing and Individual Disassembly: The three mounting ports 1-1 on the mounting frame 1 correspond to three layers of filters 2. Each filter 2 is independently secured by a "ball-head elastic locking pin 2-1.1 + slot". When a filter layer needs maintenance, it can be pulled out directly through the handle 2-1.2 at the notch 1-2 (the ball-head elastic locking pin 2-1.1 can elastically retract under external force, making it easy to insert / remove from the slot), without disassembling other layers. At the same time, the graded purification design of the pre-filter layer 2-1 (stainless steel mesh), fine filter layer 2-2 (HEPA filter material), and adsorption layer 2-3 (activated carbon) can perform targeted treatment of oil fumes through "large particle interception → fine particle filtration → odor adsorption", improving the air purification effect.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A composite filter for a range hood with air purification function, characterized in that, Includes an installation frame, within which three detachable filter screens are arranged sequentially along the airflow direction, with the three filter screens spaced apart along the width of the installation frame. On the inner wall of the mounting frame, detection mechanisms for measuring wind speed are respectively provided on the air outlet side of the second layer filter and the air outlet side of the third layer filter. The front end of the mounting frame is equipped with an indicator light that is electrically connected to the testing mechanism, and the rear end of the mounting frame is equipped with a magnetic power supply connector.

2. The composite filter screen for range hoods with air purification function according to claim 1, characterized in that, The three layers of the filter mesh, along the airflow direction, are as follows: a pre-filtration layer using stainless steel mesh, a fine filtration layer using HEPA filter media, and an adsorption layer using activated carbon. The mounting frame has three mounting openings spaced apart along its width on one side wall. Each mounting opening extends along the length of the mounting frame to form a mounting groove, and a layer of the filter screen is detachably installed in each mounting groove.

3. The composite filter screen for range hoods with air purification function according to claim 2, characterized in that, Each layer of the filter screen has a ball-head elastic locking pin on its upper and lower surfaces, and each mounting groove has a locking groove on its inner wall that is adapted to engage with the ball-head elastic locking pin.

4. The composite filter screen for range hoods with air purification function according to claim 2, characterized in that, The mounting frame has notches at the upper and lower ends of the side walls corresponding to each mounting port. Each layer of filter screen extends upward and downward on the side wall corresponding to the mounting port to form a handle, which is located in the corresponding notch.

5. The composite filter screen for range hoods with air purification function according to claim 1, characterized in that, The detection mechanism includes a detection component and a windbreak bar. The detection component includes strip-shaped deformation plates symmetrically arranged on both sides of the mounting frame. Each strip-shaped deformation plate has a strain gauge in the middle. Each strain gauge has a mounting shell above it. The windbreak bar is horizontally arranged between the two mounting shells.

6. The composite filter screen for a range hood with air purification function according to claim 5, characterized in that, Two mounting protrusions are provided on both sides of the air outlet side of the second layer filter and on both sides of the air outlet side of the third layer filter within the mounting frame. The two mounting protrusions are distributed at intervals along the height direction of the mounting frame. The two ends of the strip-shaped deformable piece are respectively fixed between the two mounting bosses.

7. The composite filter screen for a range hood with air purification function according to claim 6, characterized in that, The wind baffle is arranged horizontally on the air outlet side corresponding to the filter screen, and the length of the wind baffle is not less than 80% of the horizontal length of the filter screen.

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