Double-channel ventilation formaldehyde removal device and control method thereof
The dual-channel ventilation and aldehyde removal device automatically switches the working mode and the use of manganese dioxide filter element to decompose formaldehyde, which solves the problems of indoor formaldehyde pollution and negative pressure, and achieves intelligent and energy-saving removal effects, which are suitable for confined spaces.
Patent Information
- Application Number
- CN202411555474.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-01-07
AI Technical Summary
The prior art is difficult to effectively remove indoor formaldehyde pollution, especially in confined spaces and negative pressure environments, and the commonly used aldehyde removal methods are costly or difficult to achieve.
A dual-channel ventilation and aldehyde removal device is adopted, including a shell, outdoor air inlet, indoor air inlet, cylindrical aldehyde removal filter element, electric vector valve, indoor circulation fan, solenoid coil, air outlet valve and controller, to detect indoor negative The pressure and formaldehyde concentration are automatically switched to the working mode, and the manganese dioxide aldehyde removal filter is used to perform redox reaction to decompose formaldehyde, and air replenishment and negative pressure balance are achieved through a dual-channel structure.
It realizes intelligent and energy-saving formaldehyde removal, extends the service life of the filter element, can quickly deal with severe formaldehyde exceeding the standard, and has a compact structure and small space.
Smart Images
Figure CN119268058A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a formaldehyde removal device, and in particular to a dual-channel ventilation formaldehyde removal device and a control method thereof. Background Art
[0002] While modern industrial development has brought convenience to people's lives, it has also produced a large number of industrial products (resin materials, adhesives, preservatives, etc.) with formaldehyde as an additive. These materials have entered thousands of households with furniture such as curtains, sofas, and wall wallpapers, and formaldehyde is slowly released into the indoor air. The release of formaldehyde in furniture will last for several months or years, and the longest formaldehyde release can reach more than ten years. Laminate flooring is one of the furniture with serious formaldehyde content exceeding the standard, especially when it is heated on the basis of limited space, which further aggravates the release of formaldehyde. In addition, in daily life, burning firewood, volcanoes, ozone effects, car exhaust, home cooking and ubiquitous smokers will produce formaldehyde, which increases the formaldehyde content in indoor air. Long-term exposure to low-concentration formaldehyde environment can lead to symptoms such as neurasthenia, headache, drowsiness, and memory loss. Chronic formaldehyde poisoning is often accompanied by lung function damage, blood toxicity, reproductive toxicity, gene damage and other serious injuries, which endanger the health of residents. Long-term exposure to formaldehyde can cause pregnancy syndrome in pregnant women and even infant leukemia and chromosomal abnormalities.
[0003] At present, the commonly used indoor formaldehyde removal methods include: 1. Source control is the most effective way to reduce formaldehyde pollution, but it is limited by national conditions and the cost of the home improvement industry. The large amount of formaldehyde additives in many industrial products makes this method difficult to implement. 2. Increasing air circulation is one of the most effective methods for removing formaldehyde, but many confined spaces cannot realize the construction of fresh air systems, and the weather conditions in the region are also difficult to achieve long-term ventilation. Strong winds, haze, sandstorms, extreme cold in the northeast and summer in the south are difficult to achieve window ventilation, and some house structures do not have window ventilation conditions, etc. 3. End-of-pipe treatment mainly includes adsorption and catalytic oxidation methods. Among them, catalytic oxidation technology directly decomposes formaldehyde into water and carbon dioxide, which is a true formaldehyde-free technology, but its high manufacturing cost and equipment volume cannot be achieved in general environments. Nowadays, many formaldehyde removal methods are single-cycle indoor confined spaces, and many houses have negative pressure problems (that is, the indoor air pressure is lower than the outdoor negative pressure), resulting in insufficient indoor oxygen content. Summary of the invention
[0004] In order to solve the above technical problems, the present invention provides a dual-channel ventilation and formaldehyde removal device, including a shell, an outdoor air inlet channel, an indoor air inlet channel, a cylindrical formaldehyde removal filter element, an electric vector valve, an indoor circulation fan, an electromagnetic coil, an air outlet valve, and a controller; one end of the outdoor air inlet channel is arranged outside the shell, and the other end is arranged inside the shell, one end of the indoor air inlet channel is arranged outside the shell, and the other end is arranged inside the shell, the cylindrical formaldehyde removal filter element is arranged inside the shell, one end of the cylindrical formaldehyde removal filter element is open, and the other end is closed; the outdoor air inlet channel and the indoor air inlet channel are connected to the open end of the cylindrical formaldehyde removal filter element through a three-way connecting pipe; the electric vector valve is arranged on the outdoor air inlet channel, and is connected to the The controller is electrically connected, and the controller controls the opening and closing of the electric vector valve; the indoor circulation fan is arranged on the indoor air inlet channel and is electrically connected to the controller, and the controller controls the switch of the indoor circulation fan; the electromagnetic coil is wound around the outside of the cylindrical formaldehyde removal filter element and is electrically connected to the controller, and the controller controls the power on and off of the electromagnetic coil and the amount of current; an air outlet is arranged at one end of the shell, and the air outlet valve is arranged at the air outlet, and a shaft is arranged at one end of the air outlet valve, and one end of the shaft is movably sealed with the closed end of the cylindrical formaldehyde removal filter element, and a reset spring is sleeved on the shaft; the electromagnetic coil generates a magnetic attraction to attract the air outlet valve to one side of the cylindrical formaldehyde removal filter element, and the air outlet valve is separated from the air outlet; the controller is arranged in the shell and is connected to the power supply.
[0005] Furthermore, the cylindrical formaldehyde removal filter element includes two side filter elements, one layer is a manganese dioxide formaldehyde removal filter element, and the other layer is a full-stage purification filter element.
[0006] Furthermore, the manganese dioxide formaldehyde removal filter element of the cylindrical formaldehyde removal filter element also includes a Mn-Co-Ce-Ox catalyst.
[0007] Furthermore, the manganese dioxide formaldehyde removal filter element of the cylindrical formaldehyde removal filter element is composed of several layers of active manganese dioxide decomposition sheets stacked in a cylindrical shape.
[0008] Furthermore, a negative pressure sensor and a formaldehyde sensor are provided outside the shell, and the negative pressure sensor and the formaldehyde sensor are respectively connected to the controller to transmit collected data to the controller.
[0009] Furthermore, the closed end of the cylindrical formaldehyde removal filter element is provided with a shaft rod limiting plate, the shaft rod limiting plate is provided with a through hole, and the shaft rod of the air outlet valve is slidably connected to the through hole on the shaft rod limiting plate.
[0010] Furthermore, an outdoor air inlet fan is provided on the outdoor air inlet channel, and the outdoor air inlet fan is connected to a controller, and the controller controls the switch of the outdoor air inlet fan; a one-way valve is provided on the indoor air inlet channel, and the one-way valve allows the airflow to enter the cylindrical formaldehyde removal filter element only from the indoor air inlet.
[0011] Furthermore, a display screen is provided outside the shell, and the display screen is connected to the controller.
[0012] The present invention also provides a control method for a dual-channel ventilation and formaldehyde removal device, comprising the following steps: The device is powered on; First, check whether the indoor pressure is negative. When it is detected that the indoor pressure is lower than the outdoor pressure and the pressure difference is greater than or equal to 5Pa, it is judged that negative pressure is formed indoors and the pressure balance mode is turned on. In the pressure balance mode, the controller controls the electromagnetic coil to be powered on and opens the air outlet; the electric vector valve is turned on (the outdoor air inlet fan can be turned on at the same time). Before the electric vector valve (and the outdoor air inlet fan) are turned on, it is necessary to check whether the electromagnetic coil is powered on. The electromagnetic coil can be turned on only after it is confirmed to be powered on; (the outdoor air inlet fan sends) outdoor air into the cylindrical formaldehyde removal filter element through the outdoor air inlet channel. After being filtered layer by layer by the cylindrical formaldehyde removal filter element, the outdoor air is discharged into the room through the inner cavity of the shell and the air outlet to balance the indoor and outdoor pressures; When it is detected that the indoor and outdoor pressure difference is less than 5Pa, the pressure balance mode ends and the electric vector valve (and the outdoor air inlet fan) are closed; When the formaldehyde content in the indoor air is detected to be higher than 10μg / m³ and lower than 100μg / m³, it is judged that the indoor formaldehyde content exceeds the standard and the single-cycle formaldehyde removal mode is started; In the single-cycle formaldehyde removal mode, the controller controls the electromagnetic coil to be powered on, opens the air outlet, and controls the indoor circulation fan to be turned on. Before controlling the indoor circulation fan to be turned on, it is necessary to first check whether the electromagnetic coil is powered on. It can be turned on only after confirming that the electromagnetic coil is powered on; the indoor circulation fan sends the indoor air into the cylindrical formaldehyde removal filter element through the indoor air inlet channel. After the indoor air is filtered layer by layer by the cylindrical formaldehyde removal filter element, it is discharged into the room through the inner cavity of the shell and the air outlet to purify the indoor air. When the formaldehyde content in the indoor air is detected to be higher than 100μg / m³, it is judged that the indoor formaldehyde content is seriously exceeded and the double-circulation formaldehyde removal mode is started; In the dual-circulation formaldehyde removal mode, the controller controls the electromagnetic coil to power on and open the air outlet, and controls the indoor circulation fan and the electric vector valve to open (the outdoor air inlet fan is turned on at the same time). Before turning on the indoor circulation fan and the electric vector valve (outdoor air inlet fan), it is necessary to check whether the electromagnetic coil is powered on. Only after confirming that the electromagnetic coil is powered on can it be turned on; the indoor circulation fan sends the indoor air into the cylindrical formaldehyde removal filter element through the indoor air inlet channel, and (the outdoor air inlet fan sends) the outdoor air into the cylindrical formaldehyde removal filter element through the outdoor air inlet channel. After being filtered layer by layer by the cylindrical formaldehyde removal filter element, the air is discharged into the room through the inner cavity of the shell and the air outlet. When the indoor formaldehyde concentration is lower than 100μg / m³ and higher than 10μg / m³, the single-circulation formaldehyde removal mode is started; when the indoor formaldehyde concentration is lower than 10μg / m³, it stops working; The above steps are repeated according to the detected values.
[0013] Beneficial effects of the present invention: A dual-channel ventilation and formaldehyde removal device provided by the present invention is a fully intelligent ventilation and formaldehyde removal instrument using dual channels. Different working modes are activated according to the indoor negative pressure and formaldehyde concentration values, which is more intelligent and energy-saving. The manganese dioxide formaldehyde removal filter element of the present invention can effectively decompose indoor formaldehyde into water and carbon dioxide by redox reaction, and has a longer service life. While decomposing indoor formaldehyde, the present invention can also use the dual-channel structure to replenish outdoor air into the room in time, thereby alleviating the discomfort caused by indoor negative pressure. When the indoor formaldehyde content seriously exceeds the standard, rapid formaldehyde removal can also be carried out through the dual channels. The present invention uses a solenoid valve to control the opening or closing of the air outlet, and has a compact structure and occupies little space. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the single-cycle formaldehyde removal mode of the present invention; Figure 3 This is a schematic diagram of the double-circulation formaldehyde removal mode structure of the present invention; 1. Shell 2. Outdoor air inlet channel 3. Indoor air inlet channel 4. Cylindrical formaldehyde removal filter element 5. Electric vector valve 6. Indoor circulation fan 7. Solenoid coil 8. Air outlet valve 9. Controller 10. Shaft 11. Return spring 12. Manganese dioxide formaldehyde removal filter element 13. Full-stage purification filter element 14. Negative pressure sensor 15. Formaldehyde sensor 16. Shaft limit plate 17. Outdoor air inlet fan 18. One-way valve. DETAILED DESCRIPTION
[0015] See also Figure 1As shown, a dual-channel ventilation and formaldehyde removal device provided by the present invention includes a shell 1, an outdoor air inlet channel 2, an indoor air inlet channel 3, a cylindrical formaldehyde removal filter element 4, an electric vector valve 5, an indoor circulation fan 6, an electromagnetic coil 7, an air outlet valve 8, and a controller 9; one end of the outdoor air inlet channel 2 is arranged outside the shell 1, and is connected to the outdoors through through holes such as air-conditioning pipes reserved in the building wall; the other end is arranged in a cavity inside the shell 1; one end of the indoor air inlet channel 3 is arranged outside the shell and is connected to the indoor room, and the other end is arranged in a cavity inside the shell 1; the cylindrical formaldehyde removal filter element 4 is arranged inside the shell 1, one end of the cylindrical formaldehyde removal filter element 4 is open, and the other end is closed; the outdoor air inlet channel 2 and the indoor air inlet channel 3 are connected to the open end of the cylindrical formaldehyde removal filter element 4 through a three-way connecting pipe; the electric vector valve 5 is arranged on the outdoor air inlet channel 2 and is electrically connected to the controller 9, and the controller 9 controls the opening and closing of the electric vector valve 5; the indoor circulation fan 6 is arranged on the indoor air inlet channel 3, It is electrically connected to the controller 9, which controls the switch of the indoor circulation fan 6; the electromagnetic coil 7 is wound around the outside of the cylindrical formaldehyde removal filter element 4 and is electrically connected to the controller 9, which controls the power on and off of the electromagnetic coil 7 and the amount of current; an air outlet is provided at one end of the shell 1, and the air outlet valve 8 is provided at the air outlet. The air outlet valve 8 is truncated cone-shaped, and a shaft rod 10 is provided at the large diameter end. One end of the shaft rod 10 faces the closed end of the cylindrical formaldehyde removal filter element 4 and is movably sealed and connected to the closed end of the cylindrical formaldehyde removal filter element 4. A reset spring 11 is sleeved on the shaft 10; the electromagnetic coil 7 is energized to generate a magnetic attraction to attract the air outlet valve 8 to the side of the cylindrical formaldehyde removal filter element 4, and the air outlet valve 8 is separated from the air outlet; the electromagnetic coil 7 loses the magnetic attraction after power is cut off, and the air outlet valve 8 is reset and blocked by the reset spring 11; the controller 9 controls the current of the electromagnetic coil 7 and thus controls the magnetic attraction, thereby controlling the opening size of the air outlet and controlling the air intake flow rate; the controller 9 is arranged in the shell 1 and is connected to the power supply.
[0016] The cylindrical formaldehyde removal filter element 4 includes two side filter elements, one layer is a manganese dioxide formaldehyde removal filter element 12, and the other layer is a full-stage purification filter element 13. In this embodiment, the manganese dioxide formaldehyde removal filter element 12 also includes a Mn-Co-Ce-Ox catalyst for purifying harmful gases such as NO and CO in the air. The manganese dioxide formaldehyde removal filter element 12 is composed of several layers of active manganese dioxide decomposition sheets stacked in a cylindrical shape; the manganese dioxide formaldehyde removal filter element 12 is sleeved on the outside of the full-stage purification filter element 13. The air is first filtered through the full-stage purification filter element 13 to remove most of the impurity particles, and then the air is filtered through the manganese dioxide formaldehyde removal filter element 12 to remove formaldehyde, which can extend the service life of the manganese dioxide formaldehyde removal filter element 12.
[0017] A negative pressure sensor 14 and a formaldehyde sensor 15 are disposed outside the housing 1. The negative pressure sensor 14 and the formaldehyde sensor 15 are connected to the controller respectively. The negative pressure sensor 14 collects indoor pressure, and the formaldehyde sensor 15 collects indoor formaldehyde content and transmits the collected data to the controller.
[0018] The closed end of the cylindrical formaldehyde removal filter element 4 is provided with a shaft rod limiting plate 16 , and the shaft rod limiting plate 16 is provided with a through hole, and the shaft rod 10 of the air outlet valve 8 is slidably connected with the through hole on the shaft rod limiting plate 16 .
[0019] The outdoor air inlet channel 2 is provided with an outdoor air inlet fan 17, and the outdoor air inlet fan 17 is connected to the controller 9, and the controller 9 controls the switch of the outdoor air inlet fan 17; the indoor air inlet channel 3 is provided with a one-way valve 18, and the one-way valve 18 allows the airflow to enter the cylindrical formaldehyde removal filter element 4 only from the indoor air inlet, thereby preventing the outdoor air from directly entering the room without being filtered.
[0020] A display screen is disposed outside the housing 1 , and the display screen is connected to the controller 9 .
[0021] The present invention also provides a control method for a dual-channel ventilation and formaldehyde removal device, comprising the following steps: The device is powered on; First, the negative pressure sensor 14 is used to detect whether the indoor pressure is negative. When it is detected that the indoor pressure is lower than the outdoor pressure and the pressure difference is greater than or equal to 5Pa, it is determined that negative pressure is formed indoors and the pressure balance mode is turned on; In the pressure balance mode, the controller 9 controls the electromagnetic coil 7 to be powered on and the air outlet is opened; the electric vector valve 5 is opened, and the outdoor air inlet fan 17 is opened at the same time. Before the electric vector valve 5 and the outdoor air inlet fan 17 are opened, it is necessary to check whether the electromagnetic coil 7 is powered on. The electromagnetic coil 7 can be opened only after it is confirmed that the electromagnetic coil 7 is powered on and the air outlet is opened; the outdoor air inlet fan 17 sends the outdoor air into the cylindrical formaldehyde removal filter element 4 through the outdoor air inlet channel 2. After the outdoor air is filtered layer by layer by the cylindrical formaldehyde removal filter element 4, it is discharged into the room through the inner cavity of the housing 1 and the air outlet to balance the indoor and outdoor pressures; When it is detected that the indoor and outdoor pressure difference is less than 5Pa, the pressure balance mode ends, and the electric vector valve and the outdoor air inlet fan are closed; When the formaldehyde sensor 15 detects that the formaldehyde content in the indoor air is higher than 10μg / m³ and lower than 100μg / m³, it is judged that the indoor formaldehyde content exceeds the standard and the single-cycle formaldehyde removal mode is started; See also Figure 2As shown, in the single-cycle formaldehyde removal mode, the controller 9 controls the electromagnetic coil 7 to be powered on, opens the air outlet, and controls the indoor circulation fan 6 to be turned on. Before controlling the indoor circulation fan 6 to be turned on, it is necessary to first check whether the electromagnetic coil 7 is powered on, and it can be turned on only after confirming that the electromagnetic coil 7 is powered on and the air outlet is opened; the indoor circulation fan 6 sends the indoor air into the cylindrical formaldehyde removal filter element 4 through the indoor air inlet channel 3. After the indoor air is filtered layer by layer by the cylindrical formaldehyde removal filter element 4, it is discharged into the room through the inner cavity of the shell 1 and the air outlet to purify the indoor air; When the formaldehyde content in the indoor air is detected to be higher than 100μg / m³, it is judged that the indoor formaldehyde content is seriously exceeded and the double-circulation formaldehyde removal mode is started; See also Figure 3 As shown, in the dual-circulation formaldehyde removal mode, the controller 9 controls the electromagnetic coil 7 to be powered on to open the air outlet, and controls the indoor circulation fan 6, the electric vector valve 5, and the outdoor air inlet fan 17 to be turned on at the same time. Before turning on the indoor circulation fan 6, the electric vector valve 5, and the outdoor air inlet fan 17, it is necessary to check whether the electromagnetic coil 7 is powered on, and they can be turned on only after confirming that the electromagnetic coil 7 is powered on; the indoor circulation fan 6 sends the indoor air into the cylindrical formaldehyde removal filter element 4 through the indoor air inlet channel 3, and the outdoor air inlet fan 17 sends the outdoor air into the cylindrical formaldehyde removal filter element 4 through the outdoor air inlet channel 2. After the air is filtered layer by layer by the cylindrical formaldehyde removal filter element 4, it is discharged into the room through the inner cavity of the shell 1 and the air outlet; When the indoor formaldehyde concentration is lower than 100μg / m³ and higher than 10μg / m³, the single-cycle formaldehyde removal mode is started; when the indoor formaldehyde concentration is lower than 10μg / m³, the operation is stopped; The above steps are repeated according to the detected values.
Claims
1. A dual-channel ventilation and formaldehyde removal device, characterized in that: It includes a shell, an outdoor air inlet channel, an indoor air inlet channel, a cylindrical formaldehyde removal filter element, an electric vector valve, an indoor circulation fan, an electromagnetic coil, an air outlet valve, and a controller; one end of the outdoor air inlet channel is arranged outside the shell, and the other end is arranged inside the shell, one end of the indoor air inlet channel is arranged outside the shell, and the other end is arranged inside the shell, the cylindrical formaldehyde removal filter element is arranged inside the shell, one end of the cylindrical formaldehyde removal filter element is open, and the other end is closed; the outdoor air inlet channel and the indoor air inlet channel are connected with the open end of the cylindrical formaldehyde removal filter element through a three-way connecting pipe; the electric vector valve is arranged on the outdoor air inlet channel and is electrically connected to the controller, and the controller controls the electric The opening and closing of the vector valve; the indoor circulation fan is arranged on the indoor air inlet channel and is electrically connected to the controller, which controls the switch of the indoor circulation fan; the electromagnetic coil is wound around the outside of the cylindrical formaldehyde removal filter element and is electrically connected to the controller, which controls the power on and off of the electromagnetic coil and the amount of current; an air outlet is arranged at one end of the shell, and the air outlet valve is arranged at the air outlet, and a shaft is arranged at one end of the air outlet valve, and one end of the shaft is movably sealed with the closed end of the cylindrical formaldehyde removal filter element, and a reset spring is sleeved on the shaft; the electromagnetic coil generates a magnetic attraction to attract the air outlet valve to one side of the cylindrical formaldehyde removal filter element, and the air outlet valve is separated from the air outlet; the controller is arranged in the shell and is connected to the power supply.
2. A dual-channel ventilation and formaldehyde removal device according to claim 1, characterized in that: The cylindrical formaldehyde removal filter element comprises filter elements on two sides, one layer is a manganese dioxide formaldehyde removal filter element, and the other layer is a full-stage purification filter element.
3. A dual-channel ventilation and formaldehyde removal device according to claim 2, characterized in that: The manganese dioxide formaldehyde removal filter element of the cylindrical formaldehyde removal filter element also includes a Mn-Co-Ce-Ox catalyst.
4. A dual-channel ventilation and formaldehyde removal device according to claim 2, characterized in that: The manganese dioxide formaldehyde removal filter element of the cylindrical formaldehyde removal filter element is composed of several layers of active manganese dioxide decomposition sheets stacked in a cylindrical shape.
5. A dual-channel ventilation and formaldehyde removal device according to claim 1, characterized in that: A negative pressure sensor and a formaldehyde sensor are arranged outside the shell, and the negative pressure sensor and the formaldehyde sensor are respectively connected to the controller to transmit collected data to the controller.
6. A dual-channel ventilation and formaldehyde removal device according to claim 1, characterized in that: The closed end of the cylindrical formaldehyde removal filter element is provided with a shaft rod limiting plate, and the shaft rod limiting plate is provided with a through hole. The shaft rod of the air outlet valve is slidably connected with the through hole on the shaft rod limiting plate.
7. A dual-channel ventilation and formaldehyde removal device according to claim 1, characterized in that: The outdoor air inlet channel is provided with an outdoor air inlet fan, which is connected to a controller, and the controller controls the switch of the outdoor air inlet fan; the indoor air inlet channel is provided with a one-way valve, which allows the airflow to enter the cylindrical formaldehyde removal filter element only from the indoor air inlet.
8. A dual-channel ventilation and formaldehyde removal device according to claim 1, characterized in that: A display screen is arranged outside the shell, and the display screen is connected to the controller.
9. A control method for a dual-channel ventilation and formaldehyde removal device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The device is powered on; First, check whether the indoor pressure is negative. When it is detected that the indoor pressure is lower than the outdoor pressure and the pressure difference is greater than or equal to 5Pa, it is judged that negative pressure is formed indoors and the pressure balance mode is turned on. In the pressure balance mode, the controller controls the electromagnetic coil to be powered on and opens the air outlet; the electric vector valve is opened. Before the electric vector valve is opened, it is necessary to check whether the electromagnetic coil is powered on. It can be opened only after confirming that the electromagnetic coil is powered on; the outdoor air is sent into the cylindrical formaldehyde removal filter element through the outdoor air inlet channel. After being filtered layer by layer by the cylindrical formaldehyde removal filter element, the outdoor air is discharged into the room through the inner cavity of the shell and the air outlet to balance the indoor and outdoor pressures; When it is detected that the indoor and outdoor pressure difference is less than 5Pa, the pressure balance mode ends and the electric vector valve closes; When the formaldehyde content in the indoor air is detected to be higher than 10μg / m³ and lower than 100μg / m³, it is judged that the indoor formaldehyde content exceeds the standard and the single-cycle formaldehyde removal mode is started; In the single-cycle formaldehyde removal mode, the controller controls the electromagnetic coil to be powered on, opens the air outlet, and controls the indoor circulation fan to be turned on. Before controlling the indoor circulation fan to be turned on, it is necessary to check whether the electromagnetic coil is powered on. It can be turned on only after confirming that the electromagnetic coil is powered on; The indoor circulation fan sends the indoor air into the cylindrical formaldehyde removal filter element through the indoor air inlet channel. After being filtered layer by layer by the cylindrical formaldehyde removal filter element, the indoor air is discharged into the room through the inner cavity of the shell and the air outlet to purify the indoor air. When the formaldehyde content in the indoor air is detected to be higher than 100μg / m³, it is judged that the indoor formaldehyde content is seriously exceeded and the double-circulation formaldehyde removal mode is started; In the dual-circulation formaldehyde removal mode, the controller controls the electromagnetic coil to power on and open the air outlet, and controls the indoor circulation fan and the electric vector valve to open. Before opening the indoor circulation fan and the electric vector valve, it is necessary to check whether the electromagnetic coil is powered on. Only after confirming that the electromagnetic coil is powered on can it be opened; The indoor circulation fan sends the indoor air into the cylindrical formaldehyde removal filter through the indoor air inlet channel, and the outdoor air is sent into the cylindrical formaldehyde removal filter through the outdoor air inlet channel. After being filtered layer by layer by the cylindrical formaldehyde removal filter, the air is discharged into the room through the inner cavity of the shell and the air outlet. When the indoor formaldehyde concentration is lower than 100μg / m³ and higher than 10μg / m³, the single-cycle formaldehyde removal mode is started; when the indoor formaldehyde concentration is lower than 10μg / m³, the work is stopped; The above steps are repeated according to the detected values.
10. A control method for a dual-channel ventilation and formaldehyde removal device according to claim 9, characterized in that: In the pressure balance mode, the electric vector valve is turned on and the outdoor air inlet fan is turned on at the same time; when the pressure balance mode is ended, the electric vector valve and the outdoor air inlet fan are closed at the same time; In the dual-circulation formaldehyde removal mode, turn on the indoor circulation fan, the electric vector valve and the outdoor air inlet fan at the same time.