An air purifier

Abstract

The present invention provides an air purifier, which adopts a dual fan structure to form a dual air duct purification system, wherein the upper fan structure is for lateral air intake and top air outlet, and the lower fan structure is for back air intake and lateral air outlet; the upper fan structure includes a forward-inclined dual centrifugal fan and an upper air duct; the lower fan structure includes a backward-inclined centrifugal fan and a lower air duct. The air purifier provided by the present invention can adjust the air flow path, thereby optimizing air distribution, and the dual fan structure operates independently, improving purification performance, adapting to more application scenarios, and having a multi-directional air intake and multi-directional air outlet structure to improve purification efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification equipment, and in particular to an air purifier. Background Art

[0002] With the intensification of environmental pollution and people's increasing attention to indoor air quality, air purifiers have become an indispensable part of modern home and office environments. Traditional air purifiers usually adopt a single fan design to achieve air circulation and purification through one-way air inlet and one-way air outlet. However, this design has some obvious limitations, such as uneven air flow, low purification efficiency, high energy consumption, and high noise. In order to overcome these shortcomings, multi-fan systems have gradually become a research hotspot. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is to provide an air purifier to improve the purification efficiency of a multi-fan system.

[0005] (II) Technical solution

[0006] Provided is an air purifier, which has a dual-fan structure; the upper fan structure has side air intake and top air outlet; the lower fan structure has back air intake and side air outlet;

[0007] The upper fan structure performs single-side air intake, and the lower fan structure performs single-side air outlet, and the air intake side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on two sides of the air purifier;

[0008] or,

[0009] The upper fan structure performs air intake on both sides, and the lower fan structure performs air discharge on both sides.

[0010] Further, if the upper fan structure performs single-side air intake, the lower fan structure performs single-side air outlet, and the air intake side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on two sides of the air purifier;

[0011] Get the indoor area V and the real-time air quality index AQI(t). When the power is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed:

[0012] Get the turbulence enhancement factor TEF (AQI(t)) and POF (AQI(t)) ;

[0013]

[0014] Among them, k t k is the adjustment factor used to control the increase in turbulence intensity. p AQI is the adjustment factor used to control the increase in advection intensity. min is the minimum value of the air quality index, AQI max is the maximum value of the air quality index;

[0015] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0016] Q in-d (t) = TEF (AQI(t)) Q base ;

[0017] Q in-d (t) = Q out-d (t);

[0018] Q in-u (t) = POF (AQI(t)) Q base ;

[0019] Q in-u (t) = Q out-u (t);

[0020] Among them, Q base is the basic flow, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q in-u (t) is the air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure.

[0021] Furthermore, when the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed:

[0022] Get the advection maintenance factor PMF (AQI(t)) ;

[0023]

[0024] Where m is the adjustment factor used to control the degree of reduction of fan speed, AQI(t) is the real-time air quality index, AQI min is the minimum value of the air quality index, AQI threshold is the threshold for triggering high efficiency mode;

[0025] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0026] Q in-u (t) = PMF(AQI(t)) Q base ;

[0027] Q in-u (t) = Q out-u (t);

[0028] Q in-d (t) = α·Q in-u (t);

[0029] Q in-d (t) = Q out-d (t);

[0030] Among them, Q base is the basic flow, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q in-u (t) is the air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure, α is the proportional coefficient, and α is less than 1.

[0031] Furthermore, if the upper fan structure performs air intake on both sides, and the lower fan structure performs air discharge on both sides;

[0032] Get the indoor area V and the real-time air quality index AQI(t). When the power is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed:

[0033] Get the time delay factor TDF (AQI(t)) ;

[0034]

[0035] Where t0 is the basic time delay, t d is the maximum time delay increment, AQI min is the minimum value of the air quality index, AQI max is the maximum value of the air quality index;

[0036] Get the turbulence enhancement factor TEF (AQI(t)) and POF (AQI(t)) ;

[0037]

[0038] Among them, k t k is the adjustment factor used to control the increase in turbulence intensity. p AQI is the adjustment factor used to control the increase in advection intensity. min is the minimum value of the air quality index, AQImax is the maximum value of the air quality index;

[0039] In the first stage, the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0040] Q in-u (t) = POF (AQI(t)) Q base ;

[0041]

[0042] Q out-u (t) = Q in-u (t);

[0043] Q in-d (t) = TEF (AQI(t)) Q base ;

[0044] Q out-d (t) = Q in-d (t);

[0045]

[0046] In the second stage, the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0047] Q in-u (t) = β·POF (AQI(t)) Q base ;

[0048]

[0049] Q out-u (t) = Q in-u (t);

[0050] Q in-d (t) = TEF (AQI(t)) Q base ;

[0051] Q out-d (t) = Q in-d (t)

[0052]

[0053] Among them, Q base is the basic flow, Q in-u (t) is the air flow rate of the upper fan structure, Q in-u-l (t) is the air flow rate on the left side of the upper fan structure, Q in-u-r (t) is the right side air flow rate of the upper fan structure, Q out-u(t) is the air flow rate of the upper fan structure;

[0054] Among them, β is a set value less than 1; Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q out-d-l (t) is the air flow rate on the left side of the lower fan structure, Q out-d-r (t) is the right side air flow rate of the lower fan structure;

[0055] Each cycle includes: the first stage and the second stage, and each stage lasts for TDF (AQI(t)) Second.

[0056] Furthermore, when the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed:

[0057] Get the advection maintenance factor PMF (AQI(t)) ;

[0058]

[0059] Where m is the adjustment factor used to control the degree of reduction of fan speed, AQI(t) is the real-time air quality index, AQI min is the minimum value of the air quality index, AQI threshold is the threshold for triggering high efficiency mode;

[0060] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0061] Q in-u (t) = PMF (AQI(t)) Q base ;

[0062]

[0063] Q in-u (t) = Q out-u (t);

[0064] Q in-d (t) = PMF (AQI(t)) Q base ;

[0065] Q out-d (t) = Q in-d (t);

[0066]

[0067] Among them, Q base is the basic flow; Q in-u(t) is the air flow rate of the upper fan structure, Q in-u-l (t) is the air flow rate on the left side of the upper fan structure, Q in-u-r (t) is the right side air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure;

[0068] Among them, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q out-d-l (t) is the air flow rate on the left side of the lower fan structure, Q out-d-r (t) is the right side air flow rate of the lower fan structure.

[0069] Furthermore, the basic flow Q is obtained according to the indoor area V base ;

[0070] Q base =N h ·V;

[0071] Among them, N h The number of air changes per hour.

[0072] Furthermore, the air purifier comprises: a main body casing, the upper fan structure and the lower fan structure are arranged in the main body casing, and the upper fan structure is located above the lower fan structure;

[0073] The upper half shell of the main casing is provided with upper air inlet channels on both sides, and the upper half shell is provided with an upper air outlet channel on the top surface;

[0074] The lower half shell of the main casing is provided with lower air outlet passages on both sides, and the lower half shell is provided with a lower air inlet passage on the back side.

[0075] Furthermore, the upper fan structure includes: a forward-inclined dual centrifugal fan and an upper air duct;

[0076] The upper air duct is composed of a cylindrical air duct housing and a trumpet-shaped exhaust duct;

[0077] The forward-inclined dual centrifugal fan is arranged in the cylindrical air duct housing, and the suction ports on both sides of the forward-inclined dual centrifugal fan are arranged in through grooves opened on the end surfaces of both ends of the cylindrical air duct housing and face the upper air inlet channel;

[0078] The bottom pipe opening of the trumpet-shaped exhaust duct is connected to the interior of the cylindrical air duct housing, and the top pipe opening of the trumpet-shaped exhaust duct faces the upper air outlet channel.

[0079] Furthermore, the lower fan structure includes: a backward-inclined centrifugal fan and a lower air duct;

[0080] The suction port of the backward-inclined centrifugal fan faces the lower air inlet channel;

[0081] The lower air duct is composed of two cover plates and two rotationally symmetrical air guide plates, wherein the air guide plates include: a flat plate and a V-shaped plate smoothly connected to the flat plate, and the inner side plate surface of the V-shaped plate is an arc-shaped plate surface;

[0082] The cover plate, the outer plate surface of the V-shaped plate and the air outlet structure formed by the flat plate are connected to the lower air outlet channel.

[0083] Furthermore, both the upper air outlet channel and the lower air outlet channel are provided with air outlet grilles; and both the upper air inlet channel and the lower air inlet channel are provided with air inlet grilles and purification filters.

[0084] (III) Beneficial effects

[0085] The above technical solution of the present invention has the following advantages: the air purifier provided by the present invention can adjust the air flow path, thereby optimizing the air distribution and further improving the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual products.

[0087] Figure 1 It is a structural schematic diagram of an air purifier of the present invention;

[0088] Figure 2 It is a schematic diagram of the internal structure of an air purifier of the present invention;

[0089] Figure 3 It is a schematic diagram of the air inlet and outlet directions of the fan structure of the present invention;

[0090] Figure 4 It is a schematic diagram of the wind inlet and outlet directions of the fan structure of the present invention. DETAILED DESCRIPTION

[0091] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0092] Embodiment 1:

[0093] See also Figure 1-4 As shown, an air purifier provided by an embodiment of the present invention is a dual-fan structure; the upper fan structure has side air intake and top air outlet; the lower fan structure has back air intake and side air outlet.

[0094] The upper fan structure performs single-sided air intake, and the lower fan structure performs single-sided air outlet, and the air intake execution side of the upper fan structure and the air outlet execution side of the lower fan structure are respectively located on both sides of the air purifier, that is, the air intake side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on both sides of the air purifier.

[0095] Among them, the upper fan structure implements single-sided air intake, which means that the upper fan structure adopts left-side air intake or right-side air intake; the lower fan structure implements single-sided air outlet, which means that the lower fan structure adopts left-side air intake or right-side air intake.

[0096] Among them, the air inlet side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on both sides of the air purifier, such as: when the air inlet side of the upper fan structure is on the left, the air outlet side of the lower fan structure is on the right, or, when the air inlet side of the upper fan structure is on the right, the air outlet side of the lower fan structure is on the left.

[0097] Get the indoor area V and real-time air quality index AQI(t).

[0098] The real-time air quality index AQI(t) can be obtained through the built-in sensors of the air purifier. The sensors may include particulate matter sensors for detecting PM2.5, volatile organic compound sensors for detecting the concentration of harmful gases such as formaldehyde, carbon dioxide sensors for detecting indoor carbon dioxide concentrations, temperature sensors, and humidity sensors. It is a prior art that the air purifier obtains the real-time air quality index AQI(t) through the built-in sensor, which will not be described in detail here. The value range of AQI(t) can be set to 0-300 in the present invention, dimensionless; the indoor area V is in m 3 .

[0099] When the machine is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed:

[0100] In high-efficiency mode, the turbulence enhancement factor TEF is introduced to accelerate the diffusion of pollutants in the air by utilizing the turbulence generated by the lower fan structure. At the same time, the clean air is quickly delivered to the entire room by relying on the advection generated by the upper fan structure. (AQI(t)) and POF (AQI(t)) The above two coefficients are used to adjust the working conditions of the lower fan structure and the upper fan structure respectively to achieve the best purification effect.

[0101]

[0102] Among them, k t k is the adjustment factor used to control the increase in turbulence intensity, and its value can be selected as 0.2 (dimensionless); p AQI is a factor used to control the increase in advection intensity, and its value can be 0.3 (dimensionless); min The minimum value of the air quality index; AQI max The maximum value of the air quality index.

[0103] When air quality deteriorates, TEF (AQI(t)) POF (AQI(t)) The increase enables the lower fan structure to generate turbulence more effectively, while the upper fan structure can promote the flow of clean air more efficiently, thereby optimizing air distribution to enhance the purification effect.

[0104] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0105] Q in-d (t) = TEF (AQI(t)) Q base ;

[0106] Q in-d (t) = Q out-d (t);

[0107] Q in-u (t) = POF (AQI(t)) Q base ;

[0108] Q in-u (t) = Q out-u (t);

[0109] Among them, Q base is the basic flow rate (m 3 / h); Q in-d (t) is the air flow rate of the lower fan structure (m 3 / h); Q out-d (t) is the air flow rate of the lower fan structure (m 3 / h); Q in-u (t) is the air flow rate of the upper fan structure (m 3 / h); Q out-u (t) is the air flow rate of the upper fan structure (m 3 / h).

[0110] At this time, in high-efficiency mode, the air intake of the lower fan structure is enhanced to generate more turbulence to help disperse pollutants; and the air intake of the upper fan structure is also increased to ensure that clean air can quickly cover the entire room.

[0111] When the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed:

[0112] In maintenance mode, in order to utilize the characteristics of the upper fan structure that is more likely to generate advection to provide uniform fresh air distribution while reducing noise and energy consumption, the flow rate of the lower fan structure is controlled at a relatively low level, and the upper fan structure is mainly responsible for air circulation.

[0113] Get the advection maintenance factor PMF (AQI(t)) , through the advection maintenance factor PMF (AQI(t)) To adjust the working status of the upper fan structure:

[0114]

[0115] Wherein, m is the adjustment factor (dimensionless) used to control the degree of reduction of fan speed, which can be 0.2. m determines the degree to which the fan speed is reduced as the air quality deteriorates; AQI(t) is the real-time air quality index; AQI min The minimum value of the air quality index; AQI threshold The threshold for triggering high efficiency mode.

[0116] When the air quality is good, that is, AQI(t) is close to AQI min , at this time PMF (AQI(t)) When it is close to 1, the upper fan structure will run at a lower speed to reduce energy consumption and keep quiet to achieve noise reduction. As the air quality decreases, the wind speed will be gradually increased to maintain good air circulation and freshness to ensure air quality.

[0117] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0118] Q in-u (t) = PMF (AQI(t)) Q base ;

[0119] Q in-u (t) = Q out-u (t);

[0120] Q in-d (t) = α·Q in-u (t);

[0121] Q in-d (t) = Q out-d (t);

[0122] Among them, Q base is the basic flow; Q in-d(t) is the air flow rate of the lower fan structure; Q out-d (t) is the air flow rate of the lower fan structure; Q in-u (t) is the air flow rate of the upper fan structure; Q out-u (t) is the air flow rate of the upper fan structure; α is the proportionality coefficient (dimensionless), and α is less than 1, which is used to limit the flow rate of the lower fan structure so that it only plays an auxiliary role, and the value can be 0.3.

[0123] At this time, in maintenance mode, the upper fan structure assumes the main air circulation task, providing smooth and uniform air flow, while the lower fan structure operates at a lower flow rate, reducing unnecessary energy consumption and noise.

[0124] In the present invention, the turbulence enhancement factor TEF in the high efficiency mode is (AQI(t)) and POF (AQI(t)) It ensures a reasonable flow difference between the upper and lower fan structures, promotes effective air convection from bottom to top, and enhances the purification effect.

[0125] Advection maintenance factor PMF in maintenance mode (AQI(t)) And the proportional coefficient α ensures that the system maintains good air quality while minimizing noise and energy consumption and improving user comfort.

[0126] The present invention dynamically adjusts the working parameters of the upper and lower fan structures according to the real-time air quality index AQI(t), which can respond quickly when needed and maintain energy-saving operation at normal times. The layout of the upper and lower fan structures and the flow control strategy work together to ensure that the air in the entire room can be fully circulated and purified, avoiding the purification blind spots that may exist in traditional single-fan systems.

[0127] Embodiment 2:

[0128] See also Figure 1-4 As shown, an air purifier provided by an embodiment of the present invention is a dual-fan structure; the upper fan structure has side air intake and top air outlet; the lower fan structure has back air intake and side air outlet.

[0129] The upper fan structure performs air intake on both sides, and the lower fan structure performs air discharge on both sides.

[0130] Among them, the upper fan structure implements air intake on both sides, which means that the upper fan structure adopts air intake from both sides at the same time; the lower fan structure implements air discharge from both sides, which means that the lower fan structure adopts air discharge from both sides at the same time.

[0131] Get the indoor area V and real-time air quality index AQI(t).

[0132] The real-time air quality index AQI(t) can be obtained through the built-in sensors of the air purifier. The sensors may include particulate matter sensors for detecting PM2.5, volatile organic compound sensors for detecting the concentration of harmful gases such as formaldehyde, carbon dioxide sensors for detecting indoor carbon dioxide concentrations, temperature sensors, and humidity sensors. It is a prior art that the air purifier obtains the real-time air quality index AQI(t) through the built-in sensor, which will not be described in detail here. The value range of AQI(t) can be set to 0-300 in the present invention, dimensionless; the indoor area V is in m 3 .

[0133] When the machine is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed:

[0134] In order to prevent the clean air just discharged by the lower fan structure from being adsorbed by the upper fan structure over a large area, resulting in unnecessary purification, that is, a decrease in purification efficiency, the present invention introduces a time delay factor TDF (AQI(t)) An intermittent control strategy is adopted to optimize the coordinated work between the upper and lower fan structures by using the time difference, ensuring that the upper and lower fan structures work at different flow rates in different time periods, thereby enhancing the uniformity of air flow and purification effect.

[0135] Get the time delay factor TDF (AQI(t)) :

[0136]

[0137] Where t0 is the basic time delay (seconds); t d is the maximum time delay increment (seconds); AQI min The minimum value of the air quality index; AQI max The maximum value of the air quality index.

[0138] As air quality deteriorates, TDF (AQI(t)) Increased, making the switching between the upper and lower fan structures more frequent to quickly respond to pollution changes.

[0139] Get the turbulence enhancement factor TEF (AQI(t)) and POF (AQI(t)) ;

[0140]

[0141] Among them, k t k is the adjustment factor used to control the increase in turbulence intensity, and its value can be selected as 0.2 (dimensionless); p AQI is a factor used to control the increase in advection intensity, and its value can be 0.3 (dimensionless);min The minimum value of the air quality index; AQI max The maximum value of the air quality index.

[0142] In the first stage, the inhalation of pollutants is promoted, and the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0143] Q in-u (t) = POF (AQI(t)) Q base ;

[0144]

[0145] Q out-u (t) = Q in-u (t);

[0146] Q in-d (t) = TEF (AQI(t)) Q base ;

[0147] Q out-d (t) = Q in-d (t);

[0148]

[0149] In this stage, the upper fan structure draws in air at a larger flow rate, promoting turbulence and quickly drawing in pollutants, while the flow rate of the lower fan structure remains constant, with the air intake equal to the air outlet.

[0150] In the second stage, air diffusion is promoted, and the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0151] Q in-u (t) = β·POF (AQI(t)) Q base ;

[0152]

[0153] Q out-u (t) = Q in-u (t);

[0154] Q in-d (t) = TEF (AQI(t)) Q base ;

[0155] Q out-d (t) = Q in-d (t)

[0156]

[0157] Among them, Qbase is the basic flow; Q in-u (t) is the air flow rate of the upper fan structure; Q in-u-l (t) is the air flow rate on the left side of the upper fan structure; Q in-u-r (t) is the right side air flow rate of the upper fan structure; Q out-u (t) is the air flow rate of the upper fan structure;

[0158] Where β is a set value (dimensionless) less than 1, such as 0.5; Q in-d (t) is the air flow rate of the lower fan structure; Q out-d (t) is the air flow rate of the lower fan structure; Q out-d-l (t) is the air flow rate on the left side of the lower fan structure; Q out-d-r (t) is the right side air flow rate of the lower fan structure.

[0159] At this stage, the air intake of the upper fan structure is reduced and maintained at a low level to reduce energy consumption; while the lower fan structure operates at a larger flow rate to ensure that the purified air can be evenly distributed to every corner of the room.

[0160] Each cycle includes: the first stage and the second stage, and each stage lasts for TDF (AQI(t)) seconds. Switching between the two stages uses the time delay factor TDF (AQI(t)) This alternating operation avoids the dead spots in the traditional single mode, ensuring that the air can be more evenly distributed throughout the room, improving the purification effect.

[0161] When the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed:

[0162] Get the advection maintenance factor PMF (AQI(t)) ;

[0163]

[0164] Wherein, m is the adjustment factor (dimensionless) used to control the degree of reduction of fan speed, which can be 0.2. m determines the degree to which the fan speed is reduced as the air quality deteriorates; AQI(t) is the real-time air quality index; AQI min The minimum value of the air quality index; AQI threshold The threshold for triggering high efficiency mode.

[0165] The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is:

[0166] Q in-u (t) = PMF (AQI(t)) Q base;

[0167]

[0168] Q in-u (t) = Q out-u (t);

[0169] Q in-d (t) = PMF (AQI(t)) Q base ;

[0170] Q out-d (t) = Q in-d (t);

[0171]

[0172] Among them, Q base is the basic flow; Q in-u (t) is the air flow rate of the upper fan structure; Q in-u-l (t) is the air flow rate on the left side of the upper fan structure; Q in-u-r (t) is the right side air flow of the upper fan structure; Q out-u (t) is the air flow rate of the upper fan structure;

[0173] Among them, Q in-d (t) is the air flow rate of the lower fan structure; Q out-d (t) is the air flow rate of the lower fan structure; Q out-d-l (t) is the air flow rate on the left side of the lower fan structure; Q out-d-r (t) is the right side air flow rate of the lower fan structure.

[0174] In the present invention, in Example 1 and Example 2, the basic flow rate Q base To obtain according to the indoor area V:

[0175] Q base =N h ·V;

[0176] Among them, N h is the number of air changes per hour. In high efficiency mode, N h It can be taken as 6. In low efficiency mode, N h The recommended value is 3. You can choose the value based on the actual situation.

[0177] In the present invention, k t , k p 、AQI min 、AQI max , m, AQI threshold ,α,t0,t d, β, the values ​​of the above parameters are only examples and can be selected and preset according to the actual geographical environment of air purification.

[0178] In the present invention, the updating frequency of the real-time air quality index AQI(t) can be set by those skilled in the art according to actual needs.

[0179] In the present invention, the first startup may refer to the first startup of the day, or the first startup after purchase, or the first startup within a set time. In actual situations, technicians in this field can set it according to actual needs.

[0180] In the present invention, in Example 1 and Example 2, as Figure 1-4 As shown, an air purifier is provided, which specifically includes: a main casing 100, an upper fan structure, a lower fan structure, an air outlet grille 200, an air inlet grille 300 and a purification filter element 400.

[0181] The main housing 100 is made of high-strength, environmentally friendly materials and has good stability and durability. The upper fan structure and the lower fan structure are both arranged in the main housing 100, and the upper fan structure is located above the lower fan structure, thereby forming a dual fan structure. The dual fan structures operate independently, but can operate synchronously when necessary to form a dual air duct purification system to improve purification performance, which can be adapted to more application scenarios, thereby achieving rapid improvement of indoor air quality.

[0182] An upper air inlet channel 110 is opened on both sides of the upper shell of the main casing 100 to inhale indoor air from the side of the air purifier, and an upper air outlet channel 120 is opened on the top surface of the upper shell. After being filtered and purified by the upper fan structure, the air is discharged from the top, thereby realizing the lateral air intake and top air outlet of the upper fan structure.

[0183] A lower air outlet channel 130 is opened on both sides of the lower half shell of the main casing 100, and the air purified by the lower fan structure is discharged from the side of the purifier. A lower air inlet channel 140 is opened on the back of the lower half shell, so that the air purifier can inhale air from the rear, thereby realizing the back air intake and lateral air outlet of the lower fan structure.

[0184] Through the above-mentioned independent air duct design of the upper and lower parts, the air purifier can achieve more efficient and comprehensive indoor air circulation. The upper fan structure and the lower fan structure can work independently or collaboratively, and the operation mode can be adjusted according to the indoor air quality and user needs, so that the air purifier can be flexibly applied in different room layouts and usage scenarios, whether it is home, office or other public places, it can provide excellent air purification effect. In addition, the optimization of the air flow path reduces the airflow resistance, making the fan quieter during operation.

[0185] The upper fan structure includes: a forward-inclined dual centrifugal fan 500 and an upper air duct 600 .

[0186] The forward-inclined dual centrifugal fan 500 uses a centrifugal fan, which is a common fluid conveying equipment. It uses centrifugal force to accelerate the gas and change its flow direction. The centrifugal fan drives the impeller to rotate through a motor, so that the gas enters the suction port at the center of the impeller. Under the action of the impeller, the gas obtains centrifugal force and moves radially outward along the impeller and is pushed out at the impeller outlet. A dual centrifugal fan refers to a fan with two suction ports. According to the structure of the impeller, centrifugal fans can be divided into forward-inclined, backward-inclined, radial, etc. The forward-inclined dual centrifugal fan 500 of this embodiment uses a forward-inclined centrifugal fan with two suction ports.

[0187] The upper air duct 600 is composed of a cylindrical air duct housing 610 and a trumpet-shaped exhaust duct 620, and the two housings are an integrally formed structure.

[0188] The forward-inclined dual centrifugal fan 500 is disposed in the cylindrical air duct housing 610, and the suction ports on both sides of the forward-inclined dual centrifugal fan 500 are disposed in the through slots provided at the two end surfaces of the cylindrical air duct housing 610, and face the upper air inlet channel 110. The bottom end of the trumpet-shaped exhaust duct 620 is connected to the inside of the cylindrical air duct housing 610, and the top end of the trumpet-shaped exhaust duct 620 faces the upper air outlet channel 120.

[0189] External air enters the suction port of the forward-inclined dual centrifugal fan 500 through the upper air inlet channel 110, and enters the trumpet-shaped exhaust duct 620 driven by the forward-inclined dual centrifugal fan 500, and finally exits the air purifier from the upper air outlet channel 120. The position design of the forward-inclined dual centrifugal fan 500 and the structural design of the upper air duct 600 ensure that the air can flow efficiently and reduce air flow losses; due to the integrated design of the air duct and the fan, not only does the air purifier become quieter during operation, but the overall structure is also more compact, saving space.

[0190] The lower fan structure includes: a backward-inclined centrifugal fan 700 and a lower air duct 800 .

[0191] The backward-inclined centrifugal fan 700 uses a centrifugal fan. The principle of a centrifugal fan is to use centrifugal force to accelerate the gas and change its flow direction. The centrifugal fan drives the impeller to rotate through a motor, so that the gas enters the suction port at the center of the impeller. Under the action of the impeller, the gas obtains centrifugal force and moves radially outward along the impeller and is pushed out at the impeller outlet. According to the structure of the impeller, centrifugal fans can be divided into forward-inclined, backward-inclined, radial, etc. The backward-inclined centrifugal fan 700 of this embodiment uses a backward-inclined centrifugal fan.

[0192] The lower air duct 800 is composed of two cover plates 810 and two rotationally symmetrical air guide plates. The two cover plates 810 and the two air guide plates are arranged together to form a shell structure, and the backward-inclined centrifugal fan 700 is located at the center of the shell structure. An opening is made on the cover plate near the back of the purifier among the two cover plates 810 to accommodate the suction port of the backward-inclined centrifugal fan 700, so that the suction port of the backward-inclined centrifugal fan 700 faces the lower air inlet channel 140, so that the external air can be effectively sucked in.

[0193] The air guide plate includes: a flat plate 820 and a V-shaped plate smoothly connected to the flat plate 820. The plate surface of the V-shaped plate that is closer to the inside of the purifier is defined as the inner plate surface 830 of the V-shaped plate, and the side relatively far from the inside of the purifier is defined as the outer plate surface 840 of the V-shaped plate. In particular, the inner plate surface 830 of the V-shaped plate is designed as an arc-shaped plate surface, and such a shape helps to optimize the air flow and ensure the smoothness of the air flow. The air outlet structure formed by the cover plate 810, the outer plate surface 840 of the V-shaped plate and the flat plate 820 is connected to the lower air outlet channel 130.

[0194] External air enters the suction port of the backward-inclined centrifugal fan 700 through the lower air inlet channel 140. Driven by the backward-inclined centrifugal fan 700, the air is pushed toward the air guide plate, and the air flows along the inner plate surface 830 of the arc-shaped V-shaped plate, and then flows out from the air outlet structure formed by the cover plate 810, the outer plate surface 840 of the V-shaped plate and the flat plate 820, and is discharged from the air purifier through the lower air outlet channel 130. The position design of the backward-inclined centrifugal fan 700 and the structural design of the lower air duct 800 can effectively guide the air flow direction, reduce the vortex and energy loss of the air during the flow process, and thus improve the efficiency of air flow.

[0195] The structural design of the air guide plate helps to evenly distribute the airflow to the entire air outlet structure, avoiding the problem of local wind speed being too high or too low. It also reduces the resistance to air flow and airflow noise by optimizing the air flow path, making the air purifier quieter during operation.

[0196] The structural design of the upper air duct 600 forms a volute-type centrifugal air duct, which can effectively guide the air flow, and cooperate with the forward-inclined dual centrifugal fan 500 to achieve a large air volume purification form with air intake on both sides and air outlet on the top. The structural design of the lower air duct 800 forms a two-way flow-guiding centrifugal air duct, which effectively controls the direction of air flow, and cooperates with the backward-inclined centrifugal fan 700 to achieve a high-efficiency and low-noise purification form with air intake on the rear side and air outlet on both sides.

[0197] The upper air outlet channel 120 and the lower air outlet channel 130 are both provided with an air outlet grille 200; the upper air inlet channel 110 and the lower air inlet channel 140 are both provided with an air inlet grille 300 and a purification filter element 400. The air outlet grille 200 and the air inlet grille 300 help guide the air flow and reduce air flow turbulence. The purification filter element 400 is used to remove pollutants in the air, such as PM2.5, formaldehyde, bacteria, viruses, etc., to provide clean air. Usually, the purification filter element is a composite filter element composed of multiple layers of different materials, and each layer filters different types of pollutants.

[0198] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0199] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air purifier, characterized in that: The air purifier has a dual-fan structure; the upper fan has a side air intake and a top air outlet; The lower fan structure has air intake from the back and air outlet from the side; The upper fan structure performs single-side air intake, and the lower fan structure performs single-side air outlet, and the air intake side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on two sides of the air purifier; or, The upper fan structure performs air intake on both sides, and the lower fan structure performs air discharge on both sides.

2. An air purifier according to claim 1, characterized in that: If the upper fan structure performs single-side air intake, the lower fan structure performs single-side air outlet, and the air intake side of the upper fan structure and the air outlet side of the lower fan structure are respectively located on two sides of the air purifier; Get the indoor area V and the real-time air quality index AQI(t). When the power is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed: Get the turbulence enhancement factor TEF (AQI(t)) and POF (AQI(t)) ; Among them, k t k is the adjustment factor used to control the increase in turbulence intensity. p AQI is the adjustment factor used to control the increase in advection intensity. min is the minimum value of the air quality index, AQI max is the maximum value of the air quality index; The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is: Q in-d (t)=TEF (AQI(t)) ·Q base ; Q in-d (t)=Q out-d (t); Q in-u (t)=POF (AQI(t)) ·Q base ; Q in-u (t)=Q out-u (t); Among them, Q base is the basic flow, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q in-u (t) is the air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure.

3. An air purifier according to claim 2, characterized in that: When the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed: Get the advection maintenance factor PMF (AQI(t)) ; Where m is the adjustment factor used to control the degree of reduction of fan speed, AQI(t) is the real-time air quality index, AQI min is the minimum value of the air quality index, AQI threshold is the threshold for triggering high efficiency mode; The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is: Q in-u (t)=PMF (AQI(t)) ·Q base ; Q in-u (t)=Q out-u (t); Q in-d (t)=α·Q in-u (t); Q in-d (t)=Q out-d (t); Among them, Q base is the basic flow, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q in-u (t) is the air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure, α is the proportional coefficient, and α is less than 1.

4. An air purifier according to claim 1, characterized in that: If the upper fan structure performs air intake on both sides, and the lower fan structure performs air discharge on both sides; Get the indoor area V and the real-time air quality index AQI(t). When the power is turned on for the first time or the real-time air quality index AQI(t) reaches the threshold for triggering the high-efficiency mode, the high-efficiency mode is executed: Get the time delay factor TDF (AQI(t)) ; Where t0 is the basic time delay, t d is the maximum time delay increment, AQI min is the minimum value of the air quality index, AQI max is the maximum value of the air quality index; Get the turbulence enhancement factor TEF (AQI(t)) and POF (AQI(t)) ; Among them, k t k is the adjustment factor used to control the increase in turbulence intensity. p AQI is the adjustment factor used to control the increase in advection intensity. min is the minimum value of the air quality index, AQI max is the maximum value of the air quality index; In the first stage, the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is: Q in-u (t)=POF (AQI(t)) ·Q base ; Q out-u (t)=Q in-u (t); Q in-d (t)=TEF (AQI(t)) ·Q base ; Q out-d (t)=Q in-d (t); In the second stage, the relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is: Q in-u (t)=β·POF (AQI(t)) ·Q base ; Q out-u (t)=Q in-u (t); Q in-d (t)=TEF (AQI(t)) ·Q base ; Q out-d (t)=Q in-d (t) Among them, Q base is the basic flow, Q in-u (t) is the air flow rate of the upper fan structure, Q in-u-l (t) is the air flow rate on the left side of the upper fan structure, Q in-u-r (t) is the right side air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure; Among them, β is a set value less than 1; Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q out-d-l (t) is the air flow rate on the left side of the lower fan structure, Q out-d-r (t) is the right side air flow rate of the lower fan structure; Each cycle includes: the first stage and the second stage, and each stage lasts for TDF (AQI(t)) Second.

5. An air purifier according to claim 4, characterized in that: When the real-time air quality index AQI(t) is less than the threshold for triggering the high-efficiency mode, the maintenance mode is executed: Get the advection maintenance factor PMF (AQI(t)) ; Where m is the adjustment factor used to control the degree of reduction of fan speed, AQI(t) is the real-time air quality index, AQI min is the minimum value of the air quality index, AQI threshold is the threshold for triggering high efficiency mode; The relationship between the inlet and outlet air flow of the upper fan structure and the lower fan structure is: Q in-u (t)=PMF (AQI(t)) ·Q base ; Q in-u (t)=Q out-u (t); Q in-d (t)=PMF (AQI(t)) ·Q base ; Q out-d (t)=Q in-d (t); Among them, Q base is the basic flow; Q in-u (t) is the air flow rate of the upper fan structure, Q in-u-l (t) is the air flow rate on the left side of the upper fan structure, Q in-u-r (t) is the right side air flow rate of the upper fan structure, Q out-u (t) is the air flow rate of the upper fan structure; Among them, Q in-d (t) is the air flow rate of the lower fan structure, Q out-d (t) is the air flow rate of the lower fan structure, Q out-d-l (t) is the air flow rate on the left side of the lower fan structure, Q out-d-r (t) is the right side air flow rate of the lower fan structure.

6. An air purifier according to claim 2 or 5, characterized in that: Get basic flow Q based on indoor area V base ; Q base =N h ·V; Among them, N h The number of air changes per hour.

7. An air purifier according to claim 6, characterized in that: include: A main body casing, wherein the upper fan structure and the lower fan structure are arranged in the main body casing, and the upper fan structure is located above the lower fan structure; The upper half shell of the main casing is provided with upper air inlet channels on both sides, and the upper half shell is provided with an upper air outlet channel on the top surface; The lower half shell of the main casing is provided with lower air outlet passages on both sides, and the lower half shell is provided with a lower air inlet passage on the back side.

8. An air purifier according to claim 7, characterized in that: The upper fan structure includes: a forward-inclined dual centrifugal fan and an upper air duct; The upper air duct is composed of a cylindrical air duct housing and a trumpet-shaped exhaust duct; The forward-inclined dual centrifugal fan is arranged in the cylindrical air duct housing, and the suction ports on both sides of the forward-inclined dual centrifugal fan are arranged in through grooves opened on the end surfaces of both ends of the cylindrical air duct housing and face the upper air inlet channel; The bottom pipe opening of the trumpet-shaped exhaust duct is connected to the interior of the cylindrical air duct housing, and the top pipe opening of the trumpet-shaped exhaust duct faces the upper air outlet channel.

9. An air purifier according to claim 8, characterized in that: The lower fan structure includes: a backward-inclined centrifugal fan and a lower air duct; The suction port of the backward-inclined centrifugal fan faces the lower air inlet channel; The lower air duct is composed of two cover plates and two rotationally symmetrical air guide plates, wherein the air guide plates include: a flat plate and a V-shaped plate smoothly connected to the flat plate, and the inner side plate surface of the V-shaped plate is an arc-shaped plate surface; The cover plate, the outer plate surface of the V-shaped plate and the air outlet structure formed by the flat plate are connected to the lower air outlet channel.

10. An air purifier according to claim 9, characterized in that: The upper air outlet channel and the lower air outlet channel are both provided with air outlet grilles; the upper air inlet channel and the lower air inlet channel are both provided with air inlet grilles and purification filters.

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