Cabinet catalytic formaldehyde removal air purification device

Abstract

The utility model relates to a catalytic aldehyde removal air purification device for cabinet, including shell subassembly, purification module and control module, the upper and lower surface of shell subassembly is opened with honeycomb vent hole, the purification module includes honeycomb catalytic unit and micro axial flow fan, the honeycomb catalytic unit is loaded with platinum gold and manganese series oxide composite coating, is used for adsorbing, activation, oxidation formaldehyde, the honeycomb hole of honeycomb catalytic unit is arranged in alignment with the honeycomb vent hole of shell subassembly, forms honeycomb two -way channel, micro axial flow fan fixed mounting is under honeycomb catalytic unit, and is connected with control module, is used for the periodic operation under the control of control module. The utility model can be attached to the cabinet lateral wall or the door and realizes hidden installation, improves purification efficiency, provides monitoring protection and long -term endurance, accurately satisfies the purification demand of cabinet closed small space.

Description

Technical Field

[0001] This utility model relates to the field of air purification technology, and in particular to a catalytic formaldehyde removal air purification device for kitchen cabinets. Background Technology

[0002] In home settings, enclosed storage spaces such as cabinets and wardrobes (5-20L in volume) become "blind spots" for improving indoor air quality due to the release of formaldehyde and TVOCs from their boards and poor air circulation. Existing purification technologies for this scenario have significant shortcomings, as detailed below:

[0003] Poor spatial adaptability: For example, patent CN202221234567.8 (a wardrobe air purifier) ​​uses activated carbon adsorption and a one-way air duct design. The device is 40mm thick, which occupies storage space and cannot be installed discreetly.

[0004] Low purification efficiency: For example, patent CN202310456789.0 (enclosed space purification device) relies on natural diffusion and has no active airflow circulation. The formaldehyde removal rate is only 58% in 24 hours, and local pollutant residues are serious.

[0005] Lack of monitoring and protection: Most devices lack formaldehyde / TVOC detection modules (such as commercially available "cabinet formaldehyde removal boxes") and have no vibration protection mechanism, making it easy for the fan to fall off during handling.

[0006] Battery life limitation: For example, patent CN202122876543.2 (portable enclosed space purifier) ​​uses a 2000mAh battery, which only lasts for 25 days. Frequent charging affects the user experience. Utility Model Content

[0007] The purpose of this invention is to provide a catalytic formaldehyde removal air purification device for cabinets, in order to solve the technical problems of existing cabinet purification devices such as space occupation, incomplete purification, lack of monitoring, insufficient safety protection, and short battery life.

[0008] This utility model provides a catalytic formaldehyde removal air purification device for cabinets, including a shell assembly, a purification module and a control module;

[0009] The upper and lower surfaces of the outer shell assembly are provided with honeycomb ventilation holes; the purification module includes a honeycomb catalytic unit and a micro axial flow fan; the honeycomb catalytic unit is loaded with a platinum and manganese oxide composite coating for adsorbing, activating and oxidizing formaldehyde; the honeycomb holes of the honeycomb catalytic unit are aligned with the honeycomb ventilation holes of the outer shell assembly to form a honeycomb bidirectional channel;

[0010] The micro axial flow fan is fixedly installed below the honeycomb catalytic unit and connected to the control module for periodic operation under the control of the control module.

[0011] Furthermore, the housing assembly is made of ABS material.

[0012] Furthermore, the device also includes a detection module, which includes a formaldehyde and TVOC sensor and a vibration sensor, and the formaldehyde and TVOC sensor and the vibration sensor are connected to the control module.

[0013] Furthermore, the vibration sensor is attached to the bottom of the housing assembly and positioned away from the miniature axial fan.

[0014] Furthermore, the device also includes a power module connected to the control module, the power module including a lithium battery and a charge / discharge management module.

[0015] Furthermore, the device also includes a display module, which is embedded in a display window on the upper surface of the housing assembly and connected to the control module for real-time display of formaldehyde concentration, TVOC concentration, battery power, and fan status information.

[0016] Furthermore, the display module uses an OLED screen.

[0017] Furthermore, the number of the miniature axial flow fans is two.

[0018] Furthermore, the control module includes a control circuit board and a MOSFET drive circuit.

[0019] Furthermore, the outer casing assembly has a reset button and a TYPE-C power supply interface on its side.

[0020] Using the above solution, the catalytic formaldehyde removal air purification device for cabinets can be concealed by attaching it to the side wall or inside the door of the cabinet, improving purification efficiency, providing monitoring and protection and long-lasting operation, and accurately meeting the purification needs of the small, enclosed space of the cabinet.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a front view of the catalytic formaldehyde removal air purification device for kitchen cabinets according to this utility model;

[0023] Figure 2 This is a structural block diagram of the catalytic formaldehyde removal air purification device for kitchen cabinets according to this utility model;

[0024] Figure 3 This is the main control circuit diagram of the main control circuit board of this utility model;

[0025] Figure 4 This is the circuit diagram of the formaldehyde sensor of this utility model;

[0026] Figure 5 This is the circuit diagram of the vibration sensor of this utility model;

[0027] Figure 6 This is the circuit diagram of the OLED screen of this utility model;

[0028] Figure 7 This is the circuit diagram of the miniature axial flow fan of this utility model;

[0029] Figure 8 This is a circuit diagram of an 18650 lithium battery.

[0030] Figure 9 This is the circuit diagram of the charging and discharging management module of this utility model;

[0031] Figure 10 This is a circuit diagram of the TYPE-C power supply interface of this utility model.

[0032] Numbering on the map:

[0033] 1-Outer casing assembly; 11-Honeycomb ventilation holes; 12-OLED screen;

[0034] 21-Honeycomb catalytic unit; 22-Miniature axial flow fan;

[0035] 31 - Control circuit board; 32 - MOSFET drive circuit;

[0036] 4-Lithium battery; 5-TYPE-C power interface; 6-Reset button. Detailed Implementation

[0037] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0038] Terminology Explanation:

[0039] The principle of platinum (Pt)-manganese oxide composite catalysis: low-temperature synergistic oxidation.

[0040] When platinum (0.1 wt% loaded) is combined with manganese oxides (MnO2-CeO2, mass ratio 3:1), a synergistic mechanism of "precise adsorption-efficient activation-complete oxidation" is formed.

[0041] Adsorption stage: The active sites on the surface of platinum nanoparticles preferentially adsorb formaldehyde (HCHO) molecules, and the porous structure of MnO2-CeO2 (specific surface area 80m²) 2 / g) Assisted physical adsorption enhances pollutant capture capability.

[0042] Activation stage: the d-orbital electrons of platinum reduce the reaction activation energy, and MnO₂-CeO₂ passes through Mn 2+ / Mn 3+ / Mn 4+ valence cycle further reduces the activation energy from 120kJ / mol to 60kJ / mol, which is 40% higher in catalytic efficiency than pure platinum and 65% higher than pure MnO₂.

[0043] Oxidation stage: reactive intermediates (-CHO, -CO) react with O₂ in air to finally generate CO₂ and H₂O. The efficiency attenuation of the composite catalytic module after 2 years of continuous use is less than 10%, and no replacement is required.

[0044] Ref Figure 1 , Figure 2 As shown, this embodiment provides a catalytic formaldehyde-removing air purification device for cabinets, comprising a housing assembly 1, a purification module and a control module; honeycomb ventilation holes 11 are provided on the upper and lower surfaces of the housing assembly 1; the purification module comprises a honeycomb catalytic unit 21 and two micro axial flow fans 22; the honeycomb catalytic unit 21 is loaded with a composite coating of platinum and manganese-based oxides for adsorbing, activating and oxidizing formaldehyde; the honeycomb holes of the honeycomb catalytic unit 21 are arranged in alignment with the honeycomb ventilation holes 11 of the housing assembly 1 to form a bidirectional honeycomb channel. The honeycomb ventilation holes (with a pore diameter of 3mm and an opening rate of 60%) function as both an air inlet and an air outlet, have no unidirectional air duct resistance loss, and have an air duct efficiency η=0.9 (compared with η=0.6-0.7 for traditional unidirectional air ducts), enabling dead-angle-free air circulation in enclosed spaces. The micro axial flow fans 22 are fixedly installed below the honeycomb catalytic unit 21 and connected to the control module, and are configured to operate periodically under the control of the control module.

[0045] In this embodiment, the housing assembly 1 is made of ABS material and has an ultra-thin structure.

[0046] In this embodiment, the device further comprises a detection module, wherein the detection module comprises a formaldehyde and TVOC sensor and a vibration sensor, and the formaldehyde and TVOC sensor and the vibration sensor are connected to the control module.

[0047] In this embodiment, the vibration sensor is adhered to the bottom of the housing assembly 1 and arranged away from the micro axial flow fans 22.

[0048] In this embodiment, the device further comprises a power module connected to the control module, wherein the power module comprises a lithium battery 4 and a charge and discharge management module.

[0049] In this embodiment, the device further comprises a display module, which is embedded in the display window on the upper surface of the housing assembly 1 and connected to the control module, and is configured to display formaldehyde concentration, TVOC concentration, battery power, and fan status information in real time. The display module adopts an OLED screen 12.

[0050] In this embodiment, the control module comprises a control circuit board 31 and a MOS tube driving circuit 32.

[0051] In this embodiment, a restart button 6 and a TYPE-C power supply interface 5 are arranged on the side surface of the housing assembly 1. A USB interface can also be provided for data transmission, and a Bluetooth module can be provided for external communication.

[0052] The device is suitable for formaldehyde removal in 5-20L closed storage spaces such as cabinets and wardrobes. Particularly aiming at the problem of insufficient contact between pollutants and the purification module caused by air stagnation in closed spaces, through the structural design of periodic fan agitation + honeycomb two-way air duct, the combination of high-efficiency purification and concealed installation is realized.

[0053] Reference Figures 3 to 10 shows, the specific parameters of the device in a specific example are as follows:

[0054]

[0055]

[0056]

[0057]

[0058] The device adopts an ultra-thin ABS housing (thickness ≤ 25mm) + platinum-manganese composite honeycomb catalytic module (platinum loading 0.1wt%, mass ratio of MnO2 to CeO2 is 3:1) + core structure of periodic agitation by GM1006 micro axial flow fan, and cooperates with a formaldehyde / TVOC detection module (model SGP30), a vibration protection module (model ADXL345) and a 5000mAh 18650 lithium battery (model BH-18650-B1BA002), to achieve the following effects: adapting to 5-20L closed cabinet space, 24-hour formaldehyde removal rate > 90%, 4-6 months of battery life after a single charge, automatic shutdown when vibration above 1.5g is detected, and real-time display of pollutant concentration and device status through a 0.96-inch OLED screen. The device improves the air circulation efficiency through the two-way air duct of honeycomb holes (porosity 60%, pore diameter 3mm), and the air duct efficiency reaches 0.9, which is 38.5% higher than the traditional one-way air duct purification efficiency. The device can be attached to the side wall or inner side of the cabinet body to realize concealed installation, which accurately meets the purification requirements of the small closed space of the cabinet.

[0059] Principle of key modules:

[0060] (1) The principle of synergistic construction of honeycomb catalysis and fan

[0061] When the fan is running, the airflow forms a "two-way circulation" through the honeycomb ventilation holes on the outer shell: some honeycomb ventilation holes draw in stagnant air in the enclosed space, and when it flows through the honeycomb catalytic unit, the formaldehyde comes into full contact with the active sites of the composite coating (the contact area is 60% larger than that of the traditional unidirectional air duct); the other part of the honeycomb ventilation holes discharges clean air, driving the airflow throughout the space.

[0062] Experimental verification: 10L sealed chamber (initial formaldehyde 0.5mg / m³) 3 The fan operates at a rate of 30 seconds every 3 minutes, achieving a 24-hour removal rate of 92.3%; the fanless control group achieved only 58.1%, and the traditional unidirectional air duct control group achieved 81.5%.

[0063] (2) Fan cycle setting principle

[0064] Cycle calculation formula: T (minutes) = V (space volume, L) / [Q (fan air volume, ...

[0065] [0.3L / s)×60×η(duct efficiency, 0.9)]×K(safety factor, 1.5).

[0066] Basis: K=1.5 is an optimized value from multiple tests (the loop is incomplete when K=1.2, and power consumption increases by 20% when K=1.8);

[0067] Example: For a 20L space, the calculated time is T≈2.3 minutes. The actual setting is "run for 40 seconds every 5 minutes" to ensure that one complete cycle is completed within 3 minutes.

[0068] (3) Battery life structure principle

[0069] The power consumption is calculated using a "voltage sampling + temperature correction" algorithm.

[0070] Voltage sampling: The main control PA0 pin (12-bit ADC) acquires the battery voltage, adapting to 0-3.3V input;

[0071] Base capacity: SOC_base = [(V_bat - 3.0) / (4.2 - 3.0)] × 100;

[0072] Temperature correction: SOC = SOC_base × [1 + 0.02 × (25 - T)] (T is the ambient temperature, °C), correction factor 0.02 is based on the battery voltage characteristic curve fitting from -10℃ to 40℃ (error < 5%).

[0073] Battery life calculation: With a 10L storage space, the battery life is approximately 5000mAh / [10μA×(150 / 180)+30mA×(30 / 180)]≈41.7 days, and with a 20L storage space, it is approximately 35.2 days, which meets the target of 4-6 months.

[0074] Circuit structure:

[0075] (1) Connection structure between main control unit and peripheral modules

[0076] Main controller U1 (STM32F103C8T6):

[0077] PB6 / PB7: Connects to the SGP30 sensor to receive the pollutant concentration PWM signal;

[0078] PB10 / PB11: Connect to the ADXL345 sensor to acquire acceleration signals;

[0079] PA0: ADC input, used to acquire battery voltage;

[0080] PA1: PWM output, connected to the gate of MOSFET Q1 (SI2302) via R5 (100Ω), with the source of the MOSFET grounded and the drain connected to the fan power supply;

[0081] PA9 / PA10: I 2 Interface C, for connecting to the OLED screen's SDA / SCL;

[0082] VDD / VSS: Connect a 3.3V regulated power supply and filter with a 10μF capacitor (C1) in parallel.

[0083] (2) Power management circuit construction

[0084] Charging chip U5 (TP4056NS):

[0085] VIN terminal: Connect D1 (1N5819WS) in series to TYPE-C USB (5V), and connect D2 in parallel.

[0086] (SMF5.0A) Overvoltage protection;

[0087] BAT end: Connects to 18650 lithium battery;

[0088] STAT terminal: Connect a 2kΩ resistor (R2) in series to an LED indicator. Red light indicates charging, green light indicates fully charged.

[0089] Device assembly steps:

[0090] Shell assembly: ABS material injection molded shell (150mm×100mm×20mm), with laser-engraved honeycomb ventilation holes on the upper and lower surfaces (hole diameter 3mm, opening rate 60%), OLED display window on the front (20mm×15mm), and reserved TYPE-C interface hole (6mm×4mm) and reset button hole (diameter 5mm) on the right side.

[0091] Internal components are fixed:

[0092] The control circuit board (140mm×90mm) is fixed to the middle of the housing with four M2 screws. STM32F103C8T6, SGP30, ADXL345 and SI2302 circuits are soldered on the board.

[0093] The honeycomb catalytic unit (120mm×80mm×5mm) honeycomb holes are aligned and glued to the honeycomb ventilation holes on the upper surface of the outer shell using high-temperature resistant adhesive;

[0094] Two GM1006 fans are symmetrically fixed below the honeycomb catalytic unit (80mm apart), with the fan outlets facing the honeycomb catalytic unit (2mm apart). The power supply line (AWG28) is soldered to the drain of the MOSFET.

[0095] The 18650 lithium battery (BH-18650-B1BA002) is placed in the battery compartment at the bottom of the casing and connected to the charging chip via an AWG26 silicone wire, which is 50mm long and secured with a cable tie.

[0096] Module connection:

[0097] OLED screen with embedded display window, via I 2 Connect the C-type cable (30mm in length) to the main control PA9 / PA10;

[0098] The reset button (5mm in diameter) is fixed to the hole on the right side and is connected to the main control RESET pin via a wire;

[0099] The TYPE-C power supply interface is fixed at the hole on the right side. Connect D1 (1N5819WS) in series to the VIN terminal of the charging chip, and connect D2 (SMF5.0A) in parallel.

[0100] Device operation process:

[0101] (1) Start-up phase

[0102] Initialization after power-on: Sensor preheating (formaldehyde sensor 30 seconds, vibration sensor establishes 0g baseline), fan self-test for 5 seconds (confirms smooth airflow), OLED displays "Initializing, fan self-test";

[0103] Users input the volume of the space via a Bluetooth APP (supports Android / iOS) (5-20L adjustable), and the main controller automatically loads the corresponding cycle (e.g., 10L corresponds to "run for 30 seconds every 3 minutes").

[0104] (2) Agitation-purification stage

[0105] Standby: Fan off, only main controller, sensors, and display module operate (power consumption ≤30mA), OLED displays "Fan in standby, formaldehyde: 0.XXmg / m³". 3 ”;

[0106] Agitation: When the cycle is reached, the main control PA1 outputs a 3.3V high level, the MOSFET is turned on, and the fan runs at 1500rpm (e.g., 30 seconds in a 10L space). The OLED displays "Fan running, bidirectional circulation"; the airflow is drawn in, purified, and discharged through the honeycomb holes, achieving full space circulation.

[0107] Logic: Regardless of pollutant concentration, it operates according to a fixed cycle (as low as 0.02 mg / m³). 3 (Still circulating) to avoid residue.

[0108] (3) Protection stage

[0109] Vibration protection: When the average value of five consecutive vibration sensor samples is greater than 1.5g, the main control PA1 is pulled down to 0V, the fan stops, the OLED displays "Vibration protection, fan stopped" and the red light flashes; the restart button needs to be pressed to restore normal operation.

[0110] Low battery protection: When the battery level is less than 10%, the OLED displays "Low battery, please charge" and the red light stays on, retaining only the detection function;

[0111] Circuit protection: When the USB input voltage is >5.0V, the TVS diode clamps; when connected in reverse, the Schottky diode is cut off, and no current flows in.

[0112] (4) Data Feedback

[0113] OLED refreshes every 2 seconds: Formaldehyde (accuracy 0.01mg / m³) 3 TVOC (accuracy 1ppb), battery level (accuracy 1%), fan status;

[0114] Supports exporting 7 days of data via USB (fan operation record + concentration curve), and prompts "Check cell structure" when clogging occurs.

[0115] Performance verification:

[0116]

[0117]

[0118] This invention, through a combination of an ultra-thin shell structure, a honeycomb composite catalytic module, and a fan-driven periodic agitation mechanism, achieves an ultra-thin structure, active circulation, monitoring and protection, and long-lasting operation, filling the technological gap in precise purification within the enclosed space of a cabinet. Specific effects are as follows:

[0119] 1. The device thickness is ≤25mm, and it can be attached to the side wall / door of the cabinet for concealed installation.

[0120] 2. Formaldehyde / TVOC removal rate >90% in 24 hours. The honeycomb bidirectional air duct and fan circulation ensure that pollutants are fully in contact with the honeycomb catalytic unit.

[0121] 3. Real-time display of pollutant concentration and battery level; automatic shutdown when vibration exceeding 1.5g is detected.

[0122] 4. A single charge provides 4-6 months of battery life, reducing the frequency of user maintenance.

[0123] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A catalytic formaldehyde removal air purification device for kitchen cabinets, characterized in that, Includes the outer casing, purification module, and control module; The upper and lower surfaces of the outer shell assembly are provided with honeycomb ventilation holes; the purification module includes a honeycomb catalytic unit and a micro axial flow fan; the honeycomb catalytic unit is loaded with a platinum and manganese oxide composite coating for adsorbing, activating and oxidizing formaldehyde; the honeycomb holes of the honeycomb catalytic unit are aligned with the honeycomb ventilation holes of the outer shell assembly to form a honeycomb bidirectional channel; The micro axial flow fan is fixedly installed below the honeycomb catalytic unit and connected to the control module for periodic operation under the control of the control module.

2. The catalytic formaldehyde removal air purification device for cabinets according to claim 1, characterized in that, The housing assembly is made of ABS material.

3. The catalytic formaldehyde removal air purification device for cabinets according to claim 2, characterized in that, It also includes a detection module, which includes a formaldehyde and TVOC sensor and a vibration sensor, and the formaldehyde and TVOC sensor and the vibration sensor are connected to the control module.

4. The catalytic formaldehyde removal air purification device for cabinets according to claim 3, characterized in that, The vibration sensor is attached to the bottom of the housing assembly and positioned away from the miniature axial fan.

5. The catalytic formaldehyde removal air purification device for cabinets according to claim 4, characterized in that, It also includes a power module connected to the control module, the power module including a lithium battery and a charge / discharge management module.

6. The catalytic formaldehyde removal air purification device for cabinets according to claim 5, characterized in that, It also includes a display module, which is embedded in a display window on the upper surface of the housing assembly and connected to the control module for real-time display of formaldehyde concentration, TVOC concentration, battery power, and fan status information.

7. The catalytic formaldehyde removal air purification device for cabinets according to claim 1, characterized in that, The display module uses an OLED screen.

8. The catalytic formaldehyde removal air purification device for cabinets according to claim 1, characterized in that, The number of miniature axial flow fans is two.

9. The catalytic formaldehyde removal air purification device for cabinets according to claim 1, characterized in that, The control module includes a control circuit board and a MOSFET drive circuit.

10. The catalytic formaldehyde removal air purification device for cabinets according to claim 1, characterized in that, The outer casing assembly has a reset button and a TYPE-C power interface on its side.

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