Air purification structure

Abstract

The invention relates to the technical field of air purification, and particularly discloses an air purification structure. Comprising a shell, a first filtering unit, a second filtering unit and an air inducing unit, the first filter unit is mounted at the air inlet and comprises a steady flow filter screen, so that turbulent flow pneumatic noise is prevented from being generated at the air inlet end. The shell comprises a front shell body, a middle shell body and a rear shell body, the air inducing unit is installed between the middle shell body and the rear shell body, the air inducing unit is separated through the middle shell body, and then the volume, transmitted to the outside, of noise generated by the air inducing unit in the working process is reduced. And the user experience is ensured to be good.

Description

Technical Field

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

[0002] Tabletop range hoods are portable range hoods. Compared with traditional wall-mounted range hoods, tabletop range hoods are more flexible in their use scenarios. For example, when cooking barbecue or hot pot on the dining table, fumes and odors will be generated. At this time, the tabletop range hood can be placed on the table to absorb the fumes and odors generated during the cooking process. Although the tabletop range hood can handle the fumes during tabletop cooking, the large noise generated during the operation of the range hood will affect the user's dining experience because the range hood is close to the diners.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The invention discloses an air purification structure, which is used to improve the problem of excessive noise when a desktop range hood is used indoors.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses an air purification structure, comprising:

[0007] The housing comprises a front housing, a middle housing, a rear housing and a bottom housing, wherein the middle housing is arranged between the front housing and the rear housing, an air inlet is arranged on the front housing, and an air outlet is enclosed by the middle housing and the rear housing;

[0008] A first filter unit comprises a first fixed shell installed between the front shell and the middle shell, a flow stabilizing screen, a first filter screen and an oil collecting box, wherein the first fixed shell is installed at the air inlet of the front shell and its shape is adapted to the shape of the air inlet, the first fixed shell is annular, the first fixed shell comprises a first part and a second part, the flow stabilizing screen is arranged between the first part and the second part, the first filter screen is arranged on the inner wall of the middle shell, and the oil collecting box is installed below the first filter screen;

[0009] a second filter unit, installed between the middle shell and the rear shell, the second filter unit being used to filter the gas discharged from the air outlet;

[0010] An air induction unit is installed between the middle shell and the rear shell. The air induction unit is used to draw external air from the air inlet through the first filter unit into the shell, and guide the air filtered by the first filter unit to pass through the second filter unit and be discharged from the air outlet.

[0011] Preferably, the second filter unit includes a filter seat, a second fixed shell, a second filter screen and a first grille, the filter seat is installed on the upper part of the middle shell, the second fixed shell is installed in the filter seat, the second filter screen is installed in the second fixed shell, and the first grille is installed on the top of the second filter screen.

[0012] Preferably, the second filter screen includes a first layer and a second layer, the second layer is composed of a plurality of filter paper columns, the filter paper columns are annular prisms, and the plurality of filter paper columns are distributed in an array on the first layer, the upper openings of the filter paper columns are sealed with glue, and the gaps between the lower openings of adjacent filter paper columns are sealed with glue.

[0013] Preferably, the air induced unit includes a front volute, a rear volute and a fan installed on the rear volute, the front volute is provided with an air induced port, the front volute and the rear volute are surrounded by an air exhaust port, the air induced port is arranged downstream of the first filter, and the air exhaust port is arranged upstream of the second filter.

[0014] Preferably, the front volute includes a third part and a fourth part, the third part is used to close the fan, and the fourth part is used to gradually increase the cross-sectional area of ​​the exhaust port.

[0015] Preferably, a second grille and fixing ribs are provided on the third part, the second grille is installed at the air inlet, the fixing ribs are arranged around the edge of the third part, and the fixing ribs are used to separate the air inlet from the first filter.

[0016] Preferably, the fan comprises a wind wheel and a motor, the outer diameter of the wind wheel is Dw, the inner diameter is Dn, the outer diameter height of the blade is Hw, the inner diameter height of the blade is Hn, the inlet angle is θ, the outlet angle is α, the blade spacing is L, and the number of blades is Z, wherein:

[0017] The outer diameter of the wind wheel satisfies: Dw = (60 × Q) / (π × n × A), where Q is the flow rate, n is the rotation speed, and A is the cross-sectional area of ​​the air outlet;

[0018] The inner diameter of the wind wheel Dn = K1 × Dw, where K1 is an empirical parameter determined according to the type of wind wheel, motor and volute;

[0019] The outer diameter height of the wind wheel Hw = K2 × Dw, 0.2 ≤ K2 ≦ 0.5;

[0020] The inner diameter height of the wind wheel Hn = Hw-0.025Dn;

[0021] The wind inlet angle θ and the wind outlet angle α satisfy: π×Dw×Hw×sinα=π×Dn×Hn×sinθ(α+θ=90°);

[0022] Blade spacing L = K3 (Dw-Dn), where 0.24≤K3≤0.36;

[0023] The number of blades Z = πDw / L, where Z = 2n-1, and n is an integer.

[0024] Preferably, the rear volute matches the wind wheel, the rear volute opening is d, the average volute opening is a, the rear volute depth is B, the rear volute minimum radius is r, the 1 / 4 rear volute radius is R1, the 2 / 4 rear volute radius is R2, the 3 / 4 rear volute radius is R3, the rear volute outer radius is R4, and the rear volute air outlet angle is β, wherein;

[0025] The depth of the rear volute is B = Hw + h, 4 ≤ h ≤ 10 mm;

[0026] The rear volute opening d = A / 2B;

[0027] The average opening of the rear volute is a = 0.25d;

[0028] The minimum radius of the rear volute r = Dw + h, 4 ≤ h ≤ 10 mm;

[0029] 1 / 4 rear volute radius R1 = r + 0.5a;

[0030] 2 / 4 rear volute radius R2 = r + 1.0a;

[0031] 3 / 4 rear volute radius R3 = r + 1.5a;

[0032] The outer radius of the rear volute R4 = r + 2.0a;

[0033] The volute air outlet angle β = 180°-α.

[0034] Preferably, the area of ​​the air inlet is greater than half of the side area of ​​the front shell.

[0035] Preferably, a silicone pad is provided on the bottom surface of the bottom shell, an annular sealing pad is provided at the connection between the bottom shell and the front shell, the middle shell and the rear shell, and a strip groove is also provided on the bottom surface of the bottom shell, and the groove is used to absorb noise;

[0036] The contact surface between the frame of the first filter and the middle shell is provided with sound-absorbing cotton, the contact surface between the oil collecting box and the middle shell is provided with sound-absorbing cotton, the contact surface between the second fixed shell and the filter seat is provided with sound-absorbing cotton, the contact surface between the second fixed shell and the frame of the second filter is provided with sound-absorbing cotton, and the inner wall of the rear shell is provided with sound-absorbing cotton.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The air purification structure disclosed in the present invention is provided with a flow-stabilizing filter to evenly distribute the air flow entering the housing, thereby preventing aerodynamic noise caused by air flow turbulence. The middle shell is provided to separate the sound-generating air induction unit between the first filter unit, the second filter unit enclosure and the rear shell, thereby reducing the volume of the motor and the wind wheel transmitted to the outside world when they are working, thereby making the air purification structure basically silent when in use, ensuring user experience. At the same time, the air purification structure disclosed in the present invention includes a first filter unit and a second filter unit. Through the double filtering and purification of the first filter unit and the second filter unit, it is ensured that the exhaust gas is basically free of odor and oil smoke, thereby ensuring the cleanliness of the indoor air. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of an air purification structure provided by an embodiment of the present invention;

[0040] Figure 2 An exploded view of an air purification structure provided by an embodiment of the present invention;

[0041] Figure 3 A schematic structural diagram of an air induction unit provided in one embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the structure of a second filter screen provided in one embodiment of the present invention;

[0043] Figure 5 A schematic structural diagram of an air outlet surface of a second filter screen provided in one embodiment of the present invention;

[0044] Figure 6 A schematic structural diagram of an air inlet surface of a second filter screen provided in one embodiment of the present invention;

[0045] Figure 7 A cross-sectional view of a second filter screen provided in one embodiment of the present invention;

[0046] Figure 8 A schematic structural diagram of an air outlet surface of a second filter screen provided in another embodiment of the present invention;

[0047] Fig. 9 A schematic structural diagram of a bottom shell provided in one embodiment of the present invention.

[0048] Main component symbols: 10-housing; 11-front housing; 12-middle housing; 13-rear housing; 14-bottom housing; 141-groove; 142-sealing pad; 15-air inlet; 16-air outlet; 20-first filter unit; 21-first fixed housing; 211-first part; 212-second part; 22-steady flow filter; 23-first filter; 24-oil collecting box; 30-second filter unit; 31-filter seat; 32-second fixed housing; 33-second filter Net; 331-first layer; 332-second layer; 34-filter paper column; 35-first grille; 36-adhesive seal; 40-draft unit; 41-front volute; 411-third part; 412-fourth part; 4121-first plate; 4122-second plate; 4123-third plate; 42-second grille; 43-fixing rib; 44-rear volute; 45-fan; 451-wind wheel; 452-motor; 46-draft vent; 47-exhaust vent. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0050] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0051] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0054] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0055] Example

[0056] Since the existing desktop range hoods are relatively close to users during use, the noise generated by the range hoods without noise reduction design will affect the user's dining environment.

[0057] Therefore, the present application discloses an air purification structure, referring to Figure 1 and Figure 2 The air purification structure includes a housing 10 and a first filter unit 20 , a second filter unit 30 and an air induction unit 40 installed in the housing 10 .

[0058] Specifically, the housing 10 includes a front housing 11, a middle housing 12 and a rear housing 13 which are snap-connected in sequence, that is, the middle housing 12 is separated between the front housing 11 and the rear housing 13, and the housing 10 also includes a bottom housing 14 which is fixedly connected to the bottom of the front housing 11. The front housing 11 is a side plate, and an air inlet 15 is provided on the front housing 11, and an air outlet 16 is enclosed by the middle housing 12 and the rear housing 13. The first filter unit 20 is installed at the position of the air inlet 15, the second filter unit 30 is installed at the position of the air outlet 16, and the air induction unit 40 is separated between the middle housing 12 and the rear housing 13 by the middle housing 12. The first filter unit 20 is used to filter the air entering the housing 10 from the air inlet 15, the second filter unit 30 is used to filter the air discharged from the housing 10 to the outside, and the air induction unit 40 is used to introduce the air containing oil smoke from the outside into the housing 10 from the air inlet 15, and discharge the air in the housing 10 purified by the first filter unit 20 from the second filter unit 30 to the outside of the housing 10. After being filtered and purified by the first filter unit 20 and the second filter unit 30, the air discharged to the outside basically does not contain oil smoke and odor.

[0059] In one embodiment of the present invention, the sound-generating air induction unit 40 is isolated between the middle shell 12 and the rear shell 13, so that the noise generated by the air induction unit 40 is isolated, thereby reducing the volume of the noise transmitted to the outside.

[0060] In one embodiment of the present invention, the first filter unit 20 includes a first fixed shell 21 and a flow stabilizing screen 22. The first fixed shell 21 is installed at the air inlet 15 of the front shell 11, and the shape of the first fixed shell 21 is adapted to the shape of the air inlet 15. The first fixed shell 21 is an annular fixed shell. The first fixed shell 21 includes a first part 211 and a second part 212, and the flow stabilizing screen 22 is clamped between the first part 211 and the second part 212.

[0061] In an embodiment of the present invention, the shape of the air inlet 15 can be circular, square, or polygonal.

[0062] In one embodiment of the present invention, the front shell 11, the first fixed shell 21 and the flow stabilizing filter 22 constitute a first noise reduction module. The area of ​​the air inlet 15 should not be less than half of the area of ​​the front shell 11 of the side panel. The larger air inlet 15 can effectively prevent the generation of eddy currents at the air intake end to cause high-frequency noise, while isolating the inside of the shell 10 from the outside world, thereby playing a sound insulation role. The flow stabilizing filter 22 evenly distributes the intake air flow to prevent aerodynamic noise caused by air flow turbulence. The first part 211 and the second part 212 cooperate to fix the flow stabilizing filter 22, reduce the shaking caused by the friction between the flow stabilizing filter 22 and the incoming airflow, and thus reduce the noise.

[0063] In one embodiment of the present invention, the first filter unit 20 also includes a first filter screen 23 and an oil collecting box 24. The first filter screen 23 is tightly attached to the inner wall of the middle shell 12. The oil collecting box 24 is installed below the first filter screen 23 and at the bottom of the inner wall of the middle shell 12.

[0064] In one embodiment of the present invention, the middle shell 12, the first filter 23 and the oil collecting box 24 form a second noise reduction module. The main function of the first filter 23 is to filter and intercept oil fume particles, which has a certain effect of reducing wind speed and reducing aerodynamic noise. Sound-absorbing cotton is attached to the frame of the first filter 23 to ensure that the first filter 23 is tightly attached to the filter cavity placed on the middle shell 12, so that internal sound waves are difficult to be transmitted to the outside. The middle shell 12 is connected to the induced draft unit 40, the front first filter 23, the rear shell 13, and the bottom shell 14, and the various components are separated to reduce the sound waves generated by the motor 452 and the wind wheel 451 in the induced draft unit 40 from being transmitted to the outside of the middle shell 12. The main function of the oil collecting box 24 is to collect the oil intercepted by the first filter 23, and it also plays a role in fixing and limiting the first filter 23. The contact surface between the oil collecting box 24 and the middle shell 12 is provided with sound-absorbing cotton, which can reduce the sound waves and vibrations transmitted from the middle shell 12.

[0065] Preferably, in one embodiment of the present invention, the first filter screen 23 is a filter screen formed by composite folding of polymer materials, such as glass fiber, PP melt-blown, PET, PE, MOF and other materials.

[0066] In one embodiment of the present invention, the second filter unit 30 includes a filter seat 31, a second fixed shell 32, a second filter screen 33 and a first grille 35. The filter seat 31 is installed between the middle shell 12 and the rear shell 13, and the filter seat 31 is installed on the upper part of the middle shell 12, the second fixed shell 32 is installed in the filter seat 31, the second filter screen 33 is installed in the second fixed shell 32, and the first grille 35 is installed on the top of the second filter screen 33, and the first grille 35 is flush with the top of the rear shell 13.

[0067] In one embodiment of the present invention, the filter seat 31, the second fixed shell 32, the second filter screen 33 and the first grille 35 constitute a third noise reduction module. The filter seat 31 is used to connect the second filter screen 33 assembly and the air induction unit 40. The second fixed shell 32 is used to fix the filter screen to reduce the internal vibration between the second filter screen 33 and the filter seat 31. The contact between the second fixed shell 32 and the frame of the second filter screen 33 and the contact surface between the second fixed shell 32 and the filter seat 31 parallel to the air outlet direction are provided with sound-absorbing cotton to absorb internal noise and weaken the sound waves transmitted to the outside. The first grille 35 is a grille plate with a plurality of small holes evenly distributed, which is used to evenly distribute the air outlet and reduce aerodynamic noise.

[0068] Preferably, in one embodiment of the present invention, referring to Figure 4 and Figure 7 The second filter screen 33 includes a first layer 331 and a second layer 332, and the second layer 332 is arranged above the first layer 331. Figure 4-6 The second layer 332 is composed of a plurality of filter paper columns 34, which are annular prisms and are distributed in an array on the first layer 331. The upper openings of the filter paper columns 34 are sealed with glue, and the gaps at the lower openings of adjacent filter paper columns 34 are sealed with glue.

[0069] Specifically, a single-row prismatic filter paper column 34 is formed by folding two filter seats 31, that is, a piece of filter paper is folded into a "W" shape, or an "ω" shape, or other shapes, and then another piece of filter paper is glued to the upper opening of the folded filter paper to form a single-row filter paper column 34, and then multiple columns of filter paper columns 34 are bonded together to form the preliminary form of the second filter screen 33, and then the air outlet above the filter paper column 34 is sealed with glue, and the gap between the lower openings of the filter paper column 34 is sealed with glue to obtain the second filter paper in the present application.

[0070] Preferably, in one embodiment of the present invention, the filter paper is usually folded into a "W" shape to form a triangular prism-shaped filter paper column 34 to maintain the structural stability of the filter paper column 34 when air flows through it.

[0071] Combination Figure 5-Figure 7 In one embodiment of the present invention, after the air enters the housing 10, the air passes through the first filter unit 20 and then enters the second filter screen 33. The air first enters the first layer 331. The air entering the first layer 331 has a tendency to continue to move upward. Since the gaps between the lower openings of the adjacent filter paper columns 34 are sealed, the air can only enter the interior of the filter paper column 34 from the lower openings of the filter paper column 34, that is, Figure 7 As shown, the air passes through the first layer 331 and enters the second layer 332. Due to the top seal of the filter paper column 34, the air can only escape from the side of the filter paper column 34. A plurality of inverted "L"-shaped airflow channels are formed at the second filter screen 33, which increases the contact area and friction probability between the airflow and the second filter paper, and can increase the efficiency of the filter paper in removing pollutants in the airflow; at the same time, the plurality of airflow channels also make the airflow uniform, so that the airflow is laminar, avoids the airflow from entering a turbulent state, makes the airflow gentle, and further reduces noise.

[0072] Preferably, in one embodiment of the present invention, the first layer 331 is made of activated carbon, manganese sand, foamed carbon, carbon fiber, ceramic material, etc., and its main function is to adsorb and remove volatile organic pollutants and odors contained in the airflow.

[0073] Preferably, in one embodiment of the present invention, the second layer 332 is made of one or more composite folded materials such as non-woven fabrics, meltblown fabrics, carbon-containing fabrics, PET, carbon fibers, and MOF materials, mainly for deep removal of particulate pollutants in the airflow.

[0074] Preferably, in an embodiment of the present invention, the adhesive seal 36 is sealed using hot melt adhesive, AB adhesive, etc., so that the airflow flows in a directional manner and ensures that the airflow passes through the second layer 332 when it is discharged.

[0075] In one embodiment of the present invention, referring to Figure 3 The air induction unit 40 includes a front volute 41, a rear volute 44, and a fan 45 installed on the rear volute 44, wherein the front volute 41 is provided with an air inlet 46, and an air outlet 47 is formed between the front volute 41 and the rear volute 44. The air inlet 46 is arranged downstream of the first filter 23, and the air outlet 47 is arranged upstream of the second filter 33.

[0076] Specifically, the front volute 41 includes a third part 411 and a fourth part 412 , and the air inlet 46 is arranged on the third part 411 , wherein the third part 411 is used to cooperate with the rear volute 44 to close the fan 45 , and the fourth part 412 is used to gradually increase the cross-sectional area of ​​the exhaust port 47 .

[0077] like Figure 3As shown, the rear volute 44 is provided with a vertical side panel and an inclined side panel, and the inclined side panel cooperates with the vertical side panel to gradually increase the cross-sectional area of ​​the opening (exhaust port 47) of the rear volute 44.

[0078] like Figure 3 As shown in the figure, the third part 411 is fixedly connected to the fourth part 412, and the third part 411 is arranged below the fourth part 412. The fourth part 412 includes a first plate 4121, a second plate 4122 and a third plate 4123, wherein the first plate 4121 is a straight plate, which is adapted to the vertical side plate of the rear volute 44, and the straight plate is snap-connected to the side plate. The second plate 4122 is an inclined plate, which is adapted to the inclined side plate of the rear volute 44, and the second plate 4122 is snap-connected to the side plate.

[0079] In one embodiment of the present invention, the third plate body 4123 is a vertical plate, and the vertical third plate body 4123 is used to close the side of the exhaust port 47 at the rear volute 44 .

[0080] Furthermore, in one embodiment of the present invention, the fan 45 includes a wind wheel 451 and a motor 452. The wind wheel 451 is installed at the output end of the motor 452, and the motor 452 is installed on the inner wall of the rear volute 44. The front volute 41, the wind wheel 451, the motor 452, and the rear volute 44 constitute a fourth noise reduction module. The vertical plate on the upper part of the rear volute 44 extends to the front volute 41 to form an inclined surface, and the third plate body 4123 is an inclined plate. The inclined third plate body 4123 makes the cross-sectional area of ​​the exhaust port 47 further gradually increase along the air flow direction. When having a larger cross-sectional area and a certain air volume Q, the outlet wind speed can be reduced, and the noise caused by friction due to excessive outlet wind speed can be reduced.

[0081] Furthermore, in one embodiment of the present invention, a second grille 42 and fixed ribs 43 are provided on the third portion 411, wherein the second grille 42 is installed at the air inlet 46. The setting of the second grille 42 allows air to be evenly distributed, prevents the generation of vortices, and thereby avoids the generation of noise.

[0082] In one embodiment of the present invention, the second grille 42 also prevents the user from directly contacting the wind wheel 451 when replacing the first filter 23 .

[0083] The fixing rib 43 is arranged around the edge of the third part 411, and is used to separate the air inlet 46 from the first filter screen 23, so that a suitable distance is maintained between the first filter screen 23 and the air inlet 46. That is, it is ensured that the distance lp between the first filter screen 23 and the air inlet 46 is greater than K4 (K4 is the critical width for high-frequency noise, generally 6-12mm depending on the structure), so as to prevent the first filter screen 23 from being too close to the volute air inlet 46, which causes the air outlet interface of the first filter screen 23 to become smaller sharply after the air is discharged, increases the wind speed, and generates high-frequency noise by friction with the wall of the middle shell 12 and the second grille 42 of the volute.

[0084] In one embodiment of the present invention, the wind wheel 451 has an outer diameter of Dw, an inner diameter of Dn, a blade outer diameter height of Hw, a blade inner diameter height of Hn, an air inlet angle of θ, an air outlet angle of α, a blade spacing of L, and a blade number of Z to achieve optimal noise reduction performance.

[0085] In one embodiment of the present invention, the outer diameter of the wind wheel 451 needs to satisfy: Dw = (60 × Q) / (π × n ×

[0086] A), where Q is the design flow rate, n is the design speed, and A is the design cross-sectional area of ​​the air outlet 16;

[0087] In one embodiment of the present invention, the inner diameter of the wind wheel 451 satisfies: Dn=K1×Dw; wherein Dw is the outer diameter of the wind wheel 451; K1 is an empirical parameter, and different types of wind wheel 451, electrode types, and volute types are different;

[0088] In one embodiment of the present invention, the height of the outer diameter of the wind wheel 451 satisfies: Hw=K2×Dw; wherein Dw is the outer diameter of the wind wheel 451; K2 is an empirical parameter, generally 0.2≤K2≦0.5;

[0089] In one embodiment of the present invention, the inner diameter height of the wind wheel 451 satisfies: Hn=Hw-0.025Dn; wherein Hw is the outer diameter height of the wind wheel 451; Dn is the inner diameter of the wind wheel 451;

[0090] In one embodiment of the present invention, the wind inlet angle θ and the wind outlet angle α satisfy:

[0091] π×Dw×Hw×si nα=π×Dn×Hn×si nθ (α+θ=90°);

[0092] In one embodiment of the present invention, the blade spacing L is: L=K3(Dw-Dn); (K3 is an empirical constant, generally 0.24≤K3≤0.36);

[0093] In one embodiment of the present invention, the number of blades Z is: Z=πDw / L (Z=2n-1, n is an integer).

[0094] In one embodiment of the present invention, the relevant performance parameters of the rear volute 44 need to match the wind wheel 451, and the relevant parameters include the opening d of the rear volute 44, the average opening a of the rear volute 44, the depth B of the rear volute 44, the minimum radius r of the rear volute 44, the 1 / 4 radius R1 of the rear volute 44, the 2 / 4 radius R2 of the rear volute 44, the 3 / 4 radius R3 of the rear volute 44, the outer radius R4 of the rear volute 44, and the angle β of the air outlet 16 of the rear volute 44.

[0095] In one embodiment of the present invention, the depth B of the rear volute 44 is: B=Hw+h; Hw is the outer height of the wind wheel 451, and h is the reserved assembly clearance, which is generally 4≤h≤10mm;

[0096] In one embodiment of the present invention, the opening d of the rear volute 44 is: d=A / 2B; A is the designed cross-sectional area of ​​the air outlet 16, and B is the depth of the rear volute 44;

[0097] In one embodiment of the present invention, the average opening a of the rear volute 44 is: a=0.25d; d is the opening of the rear volute 44;

[0098] In one embodiment of the present invention, the minimum radius r of the rear volute 44 is: r=Dw+h; Dw is the outer diameter of the wind wheel 451, and h is the reserved assembly clearance, which is generally 4≤h≤10mm;

[0099] In one embodiment of the present invention, 1 / 4 of the radius R1 of the rear volute 44 is: R1 = r + 0.5a, where a is the average opening of the rear volute 44;

[0100] In one embodiment of the present invention, 2 / 4 of the radius R2 of the rear volute 44 is: R2=r+1.0a, where a is the average opening of the rear volute 44;

[0101] In one embodiment of the present invention, 3 / 4 of the radius R3 of the rear volute 44 is: R3=r+1.5a, where a is the average opening of the rear volute 44;

[0102] In one embodiment of the present invention, the outer radius R4 of the rear volute 44 is: R4=r+2.0a, where a is the average opening of the rear volute 44;

[0103] In one embodiment of the present invention, the air outlet 16 of the rear volute 44 has an angle β: β=180°-α, where α is the air outlet angle of the wind wheel 451 .

[0104] In one embodiment of the present invention, referring to Fig. 9 A silicone pad is provided on the bottom surface of the bottom shell 14 , an annular sealing pad 142 is provided at the connection between the bottom shell 14 and the front shell 11 , the middle shell 12 and the rear shell 13 , and a strip groove 141 is provided on the bottom surface of the bottom shell 14 .

[0105] In one embodiment of the present invention, the bottom shell 14, the silicone pad, the groove 141 and the sealing pad 142 constitute the fifth noise reduction module. The silicone pad prevents the machine from directly contacting the horizontal plane, which can keep the machine balanced and reduce the mechanical noise generated by the vibration between the machine and the horizontal plane; at the same time, it separates the bottom of the machine from the outside world to reduce the outflow of noise. The sealing pad 142 is arranged at the screw connection between the bottom shell 14 and the middle shell 12, the volute, and the rear shell 13 to reduce the relative displacement and vibration of the components during operation due to matching problems, thereby reducing the mechanical noise generated between each other. The strip groove 141 is used to absorb the noise transmitted to the bottom when the machine is running, reduce the transmitted sound energy to reduce noise.

[0106] In one embodiment of the present invention, a sixth noise reduction module is also included, which includes a rear shell 13 and sound insulation cotton. The rear shell 13 is used to separate the inside of the machine from the outside to reduce noise outflow. In addition, sound-absorbing cotton is arranged inside the rear shell 13, and the sound waves transmitted to the rear shell 13 will be further absorbed to reduce noise outflow.

[0107] In one embodiment of the present invention, through the cooperation of the first noise reduction module, the second noise reduction module, the third noise reduction module, the fourth noise reduction module, the fifth noise reduction module and the sixth noise reduction module, multiple noise reduction and multi-path noise reduction are achieved, thereby improving the user experience of the desktop air purification structure.

[0108] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An air purification structure, characterized in that: include: The housing comprises a front housing, a middle housing, a rear housing and a bottom housing, wherein the middle housing is arranged between the front housing and the rear housing, an air inlet is arranged on the front housing, and an air outlet is enclosed by the middle housing and the rear housing; A first filter unit comprises a first fixed shell installed between the front shell and the middle shell, a flow stabilizing screen, a first filter screen and an oil collecting box, wherein the first fixed shell is installed at the air inlet of the front shell and its shape is adapted to the shape of the air inlet, the first fixed shell is annular, the first fixed shell comprises a first part and a second part, the flow stabilizing screen is arranged between the first part and the second part, the first filter screen is arranged on the inner wall of the middle shell, and the oil collecting box is installed below the first filter screen; a second filter unit, installed between the middle shell and the rear shell, the second filter unit being used to filter the gas discharged from the air outlet; An air induction unit is installed between the middle shell and the rear shell. The air induction unit is used to draw external air from the air inlet through the first filter unit into the shell, and guide the air filtered by the first filter unit to pass through the second filter unit and be discharged from the air outlet.

2. An air purification structure according to claim 1, characterized in that: The second filter unit includes a filter seat, a second fixed shell, a second filter screen and a first grille, the filter seat is installed on the upper part of the middle shell, the second fixed shell is installed in the filter seat, the second filter screen is installed in the second fixed shell, and the first grille is installed on the top of the second filter screen.

3. An air purification structure according to claim 2, characterized in that: The second filter screen includes a first layer and a second layer, the second layer is composed of a plurality of filter paper columns, the filter paper columns are annular prism-shaped, and the plurality of filter paper columns are distributed in an array on the first layer, the upper openings of the filter paper columns are sealed with glue, and the gaps between the lower openings of adjacent filter paper columns are sealed with glue.

4. An air purification structure according to claim 3, characterized in that: The air induced unit includes a front volute, a rear volute and a fan installed on the rear volute, the front volute is provided with an air induced port, the front volute and the rear volute enclose an air exhaust port, the air induced port is arranged downstream of the first filter, and the air exhaust port is arranged upstream of the second filter.

5. An air purification structure according to claim 4, characterized in that: The front volute includes a third part and a fourth part, the third part is used to close the fan, and the fourth part is used to gradually increase the cross-sectional area of ​​the exhaust port.

6. An air purification structure according to claim 5, characterized in that: The third part is provided with a second grille and fixing ribs, the second grille is installed at the air inlet, the fixing ribs are arranged around the edge of the third part, and the fixing ribs are used to separate the air inlet from the first filter.

7. An air purification structure according to claim 4, characterized in that: The fan comprises a wind wheel and a motor, wherein the outer diameter of the wind wheel is Dw, the inner diameter is Dn, the outer diameter height of the blade is Hw, the inner diameter height of the blade is Hn, the inlet angle is θ, the outlet angle is α, the blade spacing is L, and the number of blades is Z, wherein: The outer diameter of the wind wheel satisfies: Dw = (60 × Q) / (π × n × A), where Q is the flow rate, n is the rotation speed, and A is the cross-sectional area of ​​the air outlet; The inner diameter of the wind wheel Dn = K1 × Dw, where K1 is an empirical parameter determined according to the type of wind wheel, motor and volute; The outer diameter height of the wind wheel Hw = K2 × Dw, 0.2 ≤ K2 ≦ 0.5; The inner diameter height of the wind wheel Hn = Hw-0.025Dn; The inlet angle θ and the outlet angle α satisfy: π×Dw×Hw×sinα=π×Dn×Hn×sinθ(α+θ=90°); Blade spacing L = K3 (Dw-Dn), where 0.24≤K3≤0.36; The number of blades Z = πDw / L, where Z = 2n-1, and n is an integer.

8. An air purification structure according to claim 7, characterized in that: The rear volute matches the wind wheel, the rear volute opening is d, the average volute opening is a, the rear volute depth is B, the rear volute minimum radius is r, the 1 / 4 rear volute radius is R1, the 2 / 4 rear volute radius is R2, the 3 / 4 rear volute radius is R3, the rear volute outer radius is R4, and the rear volute outlet angle is β, wherein; The depth of the rear volute is B = Hw + h, 4 ≤ h ≤ 10 mm; The rear volute opening d = A / 2B; The average opening of the rear volute is a = 0.25d; The minimum radius of the rear volute r = Dw + h, 4 ≤ h ≤ 10 mm; 1 / 4 rear volute radius R1 = r + 0.5a; 2 / 4 rear volute radius R2 = r + 1.0a; 3 / 4 rear volute radius R3 = r + 1.5a; The outer radius of the rear volute R4 = r + 2.0a; The volute air outlet angle β = 180°-α.

9. An air purification structure according to claim 1, characterized in that: The area of ​​the air inlet is greater than half of the side area of ​​the front shell.

10. An air purification structure according to claim 2, characterized in that: A silicone pad is provided on the bottom surface of the bottom shell, an annular sealing pad is provided at the connection between the bottom shell and the front shell, the middle shell and the rear shell, and a strip groove is also provided on the bottom surface of the bottom shell, and the groove is used to absorb noise; The contact surface between the frame of the first filter and the middle shell is provided with sound-absorbing cotton, the contact surface between the oil collecting box and the middle shell is provided with sound-absorbing cotton, the contact surface between the second fixed shell and the filter seat is provided with sound-absorbing cotton, the contact surface between the second fixed shell and the frame of the second filter is provided with sound-absorbing cotton, and the inner wall of the rear shell is provided with sound-absorbing cotton.

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