Shaftless diagonal flow fan and range hood

Abstract

The utility model relates to the technical field of range hoods, and discloses a shaftless diagonal flow fan and a range hood, the shaftless diagonal flow fan comprises a motor and an impeller, the impeller is arranged in the motor, the motor is used for driving the impeller to rotate, the impeller comprises an impeller support, a reinforcing hub and a plurality of diagonal flow blades, the reinforcing hub is arranged in the impeller support in a penetrating mode, and the diagonal flow blades are arranged in the impeller support. The reinforcing hub is arranged on the impeller support and located at the axis position of the impeller support, the multiple oblique flow blades are arranged in the circumferential direction of the reinforcing hub at intervals, the blade roots of the oblique flow blades are connected with the reinforcing hub, and the blade tips of the oblique flow blades are connected with a blade mounting disc which is connected with the impeller support. According to the shaftless diagonal flow fan, the shaftless hub motor is adopted, the flow channel area is increased, and the air performance is remarkably improved; the blade tips of the oblique flow blades are connected with the impeller support through the blade installation disc, blade tip gaps between the oblique flow blades and the impeller support are eliminated, when airflow drifts to the blade tip positions under the action of centrifugal force of the oblique flow blades, blade tip vortexes cannot be formed, and noise of the range hood is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a shaftless oblique flow fan and a range hood. Background Art

[0002] When people cook food in the kitchen, they usually produce a lot of oil smoke, which not only affects the kitchen environment but also causes great harm to kitchen operators. In order to purify the kitchen environment, people have designed a range hood that can discharge the oil smoke to the outside of the kitchen.

[0003] like Figure 1 and Figure 2 As shown, the oblique flow fan used in the suction device of the current range hood is a hub-type shaft motor, the root of the oblique flow blade 23' of the impeller is installed on the hub 22', and there is a gap between the tip 231' of the oblique flow blade 23' and the impeller bracket 22'. Under the centrifugal force of the oblique flow blade 23', the airflow is easy to form a tip vortex at the position of the tip 231' and leak, resulting in large flow loss, low efficiency, and gap noise. In addition, due to processing problems, it is difficult to ensure that the tip gaps of each oblique flow blade 23' remain consistent, thereby generating periodic aerodynamic noise. Utility Model Content

[0004] The utility model aims to provide a shaftless oblique flow fan and a range hood, which solve the technical problems in the prior art that there is a gap between the tip of the oblique flow blade and the impeller bracket, which easily forms a tip vortex, has a large flow loss, is low in efficiency, and easily generates noise.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a shaftless oblique flow fan, comprising:

[0007] Motor;

[0008] An impeller is arranged inside the motor, and the motor is used to drive the impeller to rotate. The impeller includes an impeller bracket, a reinforced hub and a plurality of oblique flow blades. The reinforced hub is penetrated into the impeller bracket and is located at the axial position of the impeller bracket. The plurality of oblique flow blades are arranged at intervals in the circumference of the reinforced hub, and the roots of the oblique flow blades are connected to the reinforced hub, and the tips of the oblique flow blades are connected to the blade mounting disk, and the blade mounting disk is connected to the impeller bracket.

[0009] The shaftless diagonal flow fan sets the impeller inside the motor, and the impeller is driven to rotate by the motor. The motor adopts a shaftless hub motor, the working area of ​​the diagonal flow blade is increased, the flow channel area is increased, and the air performance is significantly improved; the tip of the diagonal flow blade of the impeller is connected to the impeller bracket through the blade mounting plate, eliminating the tip gap between the diagonal flow blade and the impeller bracket, and when the airflow drifts to the tip position under the action of the centrifugal force of the diagonal flow blade, no tip vortex is formed, thereby reducing noise.

[0010] As a preferred solution of the above-mentioned shaftless diagonal flow fan, a blade tip of each of the diagonal flow blades is connected to a blade mounting plate.

[0011] The tip of each oblique flow blade is connected to a blade mounting plate, which facilitates the installation of the oblique flow blade and the blade mounting plate.

[0012] As a preferred solution of the above-mentioned shaftless diagonal flow fan, the blade mounting disk is an arc-shaped structure, and the blade mounting disk is in contact with the inner wall of the impeller bracket.

[0013] The blade mounting plate is an arc-shaped structure, which can fit with the inner wall of the impeller bracket to avoid blocking the gas flow.

[0014] As a preferred solution of the above-mentioned shaftless diagonal flow fan, a first fixing hole is provided on the blade mounting disk, and a second fixing hole corresponding to the first fixing hole is provided on the impeller bracket, and a fixing member passes through the corresponding second fixing hole and the first fixing hole to connect the blade mounting disk and the impeller bracket.

[0015] The blade mounting plate and the impeller bracket are connected by the cooperation of the fixing piece and the fixing hole. This connection method is convenient to operate and has good fixing strength.

[0016] As a preferred solution of the above-mentioned shaftless diagonal flow fan, the motor includes:

[0017] Motor stator;

[0018] The motor rotor is rotatably arranged in the motor stator, and the impeller bracket is connected to the inside of the motor rotor and rotates synchronously with the motor rotor.

[0019] The motor includes a motor stator and a motor rotor. The motor rotor rotates relative to the motor stator, thereby driving the impeller to rotate.

[0020] As a preferred solution of the above-mentioned shaftless diagonal flow fan, a transmission groove is provided on one of the motor rotor and the impeller bracket, and a transmission protrusion is provided on the other of the motor rotor and the impeller bracket, and the transmission protrusion can be inserted into the transmission groove.

[0021] The impeller bracket and the motor rotor can be rotated synchronously through the plug-in cooperation of the transmission groove and the transmission protrusion.

[0022] As a preferred solution of the above-mentioned shaftless diagonal flow fan, the transmission protrusion is provided on the outer wall of the impeller bracket, the transmission protrusion is arranged parallel to the axis of the impeller bracket, and the transmission groove is provided in the motor rotor.

[0023] The transmission protrusion is arranged on the outer wall of the impeller bracket, and the transmission protrusion is arranged parallel to the axis of the impeller bracket, so as to facilitate plugging and installation with the transmission groove of the motor rotor.

[0024] As a preferred solution of the above-mentioned shaftless diagonal flow fan, a plurality of the transmission protrusions are arranged at equal intervals in the circumferential direction of the impeller bracket, a plurality of the transmission grooves are arranged in the motor rotor, and the transmission protrusions are matched with the transmission grooves one by one.

[0025] A plurality of transmission protrusions are arranged at equal intervals, and the transmission protrusions and the transmission grooves cooperate one by one, so that the driving force of the motor rotor on the impeller bracket can be more uniform, and the rotation of the impeller can be more stable.

[0026] As a preferred solution of the above-mentioned shaftless diagonal flow fan, the reinforced hub is an airfoil hub.

[0027] The reinforced hub is an airfoil hub, which weakens the airflow separation at the trailing edge of the reinforced hub, thereby improving the smoke exhaust effect of the shaftless oblique flow fan and reducing noise.

[0028] The utility model also provides a range hood, comprising:

[0029] A chassis, wherein the shaftless diagonal flow fan as described above is arranged in the chassis;

[0030] A smoke collecting chamber is arranged at the lower part of the chassis, and an impeller air inlet of the shaftless oblique flow fan is arranged toward the smoke collecting chamber and is communicated with the smoke collecting chamber.

[0031] The above-mentioned shaftless oblique flow fan is arranged in the chassis of the range hood. The impeller air inlet of the shaftless oblique flow fan is arranged toward the smoke collecting chamber and is communicated with the smoke collecting chamber. The range hood increases the flow channel area and significantly improves the air performance through the above-mentioned shaftless oblique flow fan; the tip gap between the oblique flow blades and the impeller bracket is eliminated, the oblique flow blades have centrifugal flow, and the airflow drifts to the blade tip position under the action of centrifugal force, and does not form blade tip vortices, thereby reducing the noise of the range hood.

[0032] Beneficial effects of the utility model:

[0033] The utility model proposes a shaftless oblique flow fan, in which an impeller is arranged inside a motor, and the impeller is driven to rotate by the motor. The motor adopts a shaftless hub motor, and the working area of ​​the oblique flow blades is increased, the flow channel area is increased, and the air performance is significantly improved; the blade tips of the oblique flow blades of the impeller are connected to the impeller bracket through a blade mounting plate, thereby eliminating the blade tip gap between the oblique flow blades and the impeller bracket, and when the airflow drifts to the blade tip position under the action of the centrifugal force of the oblique flow blades, no blade tip vortex is formed, thereby reducing noise.

[0034] The range hood provided by the utility model increases the flow channel area through the shaftless oblique flow fan, significantly improves the air performance, and reduces the noise of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a diagonal flow fan provided in the prior art;

[0036] Figure 2 It is a partial structural schematic diagram of a diagonal flow fan provided in the prior art;

[0037] Figure 3 It is a cross-sectional view of the shaftless diagonal flow fan provided by the utility model;

[0038] Figure 4 It is an exploded view of the shaftless diagonal flow fan provided by the utility model;

[0039] Figure 5 It is a structural schematic diagram of the impeller and the guide assembly provided by the utility model;

[0040] Figure 6 It is a side view of the impeller provided by the utility model;

[0041] Figure 7 It is a partial structural schematic diagram of the impeller provided by the utility model;

[0042] Figure 8 This is a schematic diagram of the structure of the impeller provided by the utility model after the impeller bracket is removed;

[0043] Fig. 9 It is a structural schematic diagram of the impeller bracket provided by the utility model;

[0044] Fig.10 It is a structural schematic diagram of the motor stator provided by the utility model;

[0045] Fig.11 It is a structural schematic diagram of the motor rotor provided by the utility model;

[0046] Fig.12 It is a structural schematic diagram of the bearing provided by the utility model;

[0047] Fig.13 It is a structural schematic diagram of the flow guide assembly provided by the utility model;

[0048] Fig.14 It is a structural schematic diagram of the range hood provided by the utility model.

[0049] In the figure:

[0050] 100. shaftless oblique flow fan; 200. chassis; 300. smoke collecting chamber;

[0051] 1. Motor; 11. Motor stator; 111. Motor stator housing; 112. Motor stator winding; 12. Motor rotor; 121. Transmission groove; 122. Motor rotor housing; 123. Motor rotor permanent magnet; 13. Bearing; 131. Bearing outer ring; 132. Bearing inner ring; 133. Roller bracket; 134. Bearing roller;

[0052] 2. impeller; 21. impeller bracket; 211. second fixing hole; 212. transmission protrusion; 22. reinforced hub; 23. oblique flow blade; 231. blade tip; 24. blade mounting plate; 241. first fixing hole; 25. impeller air inlet; 26. impeller air outlet;

[0053] 3. Guide assembly; 31. Guide vane bracket; 32. Guide vane; 33. Avoidance hole; 34. Guide vane inlet; 35. Guide vane outlet;

[0054] 21', impeller bracket; 22', hub; 23', oblique flow blade; 231', blade tip. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0056] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0059] like Figure 1 and Figure 2 As shown, the oblique flow fan used in the suction device of the current range hood is a hub-type shaft motor, the root of the oblique flow blade 23' of the impeller is installed on the hub 22', and there is a gap between the tip 231' of the oblique flow blade 23' and the impeller bracket 21'. Under the centrifugal force of the oblique flow blade 23', the airflow is easy to form a tip vortex at the position of the tip 231' and leak, resulting in large flow loss, low efficiency, and gap noise. In addition, due to processing problems, it is difficult to ensure that the tip gaps of each oblique flow blade 23' remain consistent, thereby generating periodic aerodynamic noise.

[0060] In order to solve the above problems, Figure 3-Figure 7 As shown, the present embodiment provides a shaftless diagonal flow fan 100, which includes a motor 1 and an impeller 2. The impeller 2 is arranged inside the motor 1, and the motor 1 is used to drive the impeller 2 to rotate. The impeller 2 includes an impeller bracket 21, a reinforced hub 22 and a plurality of diagonal flow blades 23. In the present embodiment, the impeller bracket 21 is a cylindrical structure, the reinforced hub 22 is penetrated into the impeller bracket 21 and is located at the axial position of the impeller bracket 21, and the plurality of diagonal flow blades 23 are arranged at intervals in the circumference of the reinforced hub 22, and the blade roots of the diagonal flow blades 23 are connected to the reinforced hub 22, and the blade tips 231 of the diagonal flow blades 23 are connected to the blade mounting disk 24, and the blade mounting disk 24 is connected to the impeller bracket 21.

[0061] The shaftless diagonal flow fan 100 sets the impeller 2 inside the motor 1, and the impeller 2 is driven to rotate by the motor 1. The motor 1 adopts a shaftless hub motor, the working area of ​​the diagonal flow blade 23 is increased, the flow channel area is increased, and the air performance is significantly improved; the tip 231 of the diagonal flow blade 23 is connected to the impeller bracket 21 through the blade mounting plate 24. Since the installation of the blade mounting plate 24 eliminates the tip gap between the diagonal flow blade 23 and the impeller bracket 21, the airflow drifts to the position of the tip 231 under the action of the centrifugal force of the diagonal flow blade 23, and no tip vortex is formed, thereby reducing the noise of the shaftless diagonal flow fan 100.

[0062] Preferably, a plurality of oblique flow blades 23 are arranged at equal intervals in the circumference of the reinforcing hub 22 to guide the incoming air more evenly.

[0063] Alternatively, if Figure 8 As shown, the tip 231 of each oblique flow blade 23 is connected to a blade mounting plate 24 to facilitate the installation of the oblique flow blade 23 and the blade mounting plate 24. In this embodiment, the blade mounting plate 24 is an arc-shaped structure, and the blade mounting plate 24 fits the inner wall of the impeller bracket 21, so as to avoid the blade mounting plate 24 blocking the gas flow.

[0064] In order to realize the connection between the blade mounting plate 24 and the impeller support 21, in this embodiment, as shown in FIG. Figure 8 and Fig. 9 As shown, a first fixing hole 241 is provided on the blade mounting disk 24, and a second fixing hole 211 corresponding to the first fixing hole 241 is provided on the impeller bracket 21. The fixing piece passes through the corresponding second fixing hole 211 and the first fixing hole 241 to connect the blade mounting disk 24 and the impeller bracket 21. This connection method is relatively convenient to operate and has good fixing strength; in addition, the cooperation between the fixing piece and the fixing hole can also facilitate the disassembly of the blade mounting disk 24 and the impeller bracket 21, which is convenient for maintenance. The number of the first fixing holes 241 provided on the specific blade mounting disk 24 and the number of the second fixing holes 211 provided on the impeller bracket 21 are not specifically limited here, and can be set according to needs. In other embodiments, the connection between the blade mounting disk 24 and the impeller bracket 21 is not limited to the above-mentioned connection method, and can also be other connection methods, such as snap-in, plug-in, etc.

[0065] like Figure 3 and Figure 4 As shown, the motor 1 includes a motor stator 11 and a motor rotor 12. The motor rotor 12 is rotatably disposed in the motor stator 11. The impeller bracket 21 is connected to the inside of the motor rotor 12 and rotates synchronously with the motor rotor 12. The motor rotor 12 rotates relative to the motor stator 11, thereby driving the impeller 2 to rotate.

[0066] Specifically, Fig.10As shown, the motor stator 11 includes a motor stator housing 111 and multiple groups of motor stator windings 112. The motor stator housing 111 is a cylindrical structure, and the multiple groups of motor stator windings 112 are arranged at intervals on the circumferential inner wall of the motor stator housing 111. Fig.11 As shown, the motor rotor 12 includes a motor rotor housing 122 and multiple groups of motor rotor permanent magnets 123. The motor rotor housing 122 is a cylindrical structure. The motor rotor housing 122 is installed in the motor stator housing 111. The multiple groups of motor rotor permanent magnets 123 are arranged at intervals on the circumferential outer wall of the motor rotor housing 122. The motor stator winding 112 cooperates with the motor rotor permanent magnets 123 to form a rotational driving force.

[0067] Furthermore, if Figure 3 and Figure 4 As shown, the motor 1 further includes a bearing 13, and the motor rotor 12 is rotatably arranged in the motor stator 11 through the bearing 13. The motor rotor 12 realizes relative rotation with the motor stator 11 through the bearing 13. In this embodiment, two bearings 13 are provided, and both ends of the motor rotor 12 are rotatably installed in the motor stator 11 through a bearing 13 respectively, so as to ensure stable rotation of the motor rotor 12.

[0068] Specifically, Fig.12 As shown, the bearing 13 includes a bearing outer ring 131, a bearing inner ring 132, a roller bracket 133 and a bearing roller 134. The bearing inner ring 132 is arranged in the bearing outer ring 131, the roller bracket 133 is arranged between the bearing outer ring 131 and the bearing inner ring 132, and a plurality of bearing rollers 134 are arranged on the roller bracket 133. The bearing outer ring 131 is connected to the inner wall of the motor stator housing 111, and the bearing inner ring 132 is connected to the outer wall of the motor rotor housing 122. The bearing inner ring 132 and the bearing outer ring 131 can rotate relative to each other to realize the rotation of the motor rotor 12 relative to the motor stator 11.

[0069] like Fig. 9 and Fig.11As shown, in order to realize the synchronous rotation of the motor rotor 12 and the impeller 2, a transmission groove 121 is provided on one of the motor rotor 12 and the impeller support 21, and a transmission protrusion 212 is provided on the other of the motor rotor 12 and the impeller support 21, and the transmission protrusion 212 can be inserted into the transmission groove 121. Through the plug-in cooperation of the transmission groove 121 and the transmission protrusion 212, the impeller support 21 and the motor rotor 12 can be made to rotate synchronously. In this embodiment, the transmission protrusion 212 is provided on the outer wall of the impeller support 21, and the transmission groove 121 is provided on the inner wall of the motor rotor housing 122 of the motor rotor 12. The transmission protrusion 212 is arranged parallel to the axis of the impeller support 21, so as to facilitate plug-in installation with the transmission groove 121 of the motor rotor 12. Preferably, a plurality of transmission protrusions 212 are evenly spaced around the impeller support 21, and a plurality of transmission grooves 121 are provided in the motor rotor 12. The transmission protrusions 212 cooperate with the transmission grooves 121 one by one, so that the driving force of the motor rotor 12 on the impeller support 21 can be more uniform, and the rotation of the impeller 2 can be more stable. In other embodiments, the transmission grooves 121 can also be provided on the impeller support 21, and the transmission protrusions 212 can be provided on the motor rotor 12.

[0070] In this embodiment, Figure 3 As shown, the reinforced hub 22 is an airfoil hub, which can weaken the airflow separation at the trailing edge of the reinforced hub 22, thereby improving the smoke exhaust effect of the shaftless diagonal flow fan 100 and reducing noise.

[0071] Alternatively, if Figure 3-Figure 5 As shown, one end of the impeller 2 located at the leading edge of the reinforced hub 22 is the impeller air inlet 25, and one end of the impeller 2 located at the trailing edge of the reinforced hub 22 is the impeller air outlet 26. The shaftless diagonal flow fan 100 further includes a guide assembly 3, which is arranged at one end of the impeller 2 where the impeller air outlet 26 is arranged, and the guide assembly 3 is connected to the motor stator housing 111, and one end of the guide assembly 3 close to the impeller air outlet 26 is the guide vane inlet 34, and one end of the guide assembly 3 away from the impeller air outlet 26 is the guide vane outlet 35, and the trailing edge of the reinforced hub 22 extends into the guide assembly 3. The arrangement of the guide assembly 3 can guide the wind output by the impeller 2 to facilitate the discharge of gas.

[0072] Furthermore, if Fig.13As shown, the guide assembly 3 includes a guide vane bracket 31 and a guide vane 32, one end of the guide vane bracket 31 is connected to the motor stator housing 111, and the guide vane bracket 31 is connected to the impeller bracket 21; a plurality of guide vanes 32 are arranged at intervals along the circumferential inner wall of the impeller bracket 21, the outer ring of the guide vane 32 is connected to the inner wall of the impeller bracket 21, the inner ring of the guide vane 32 extends toward the axis of the impeller bracket 21, and the inner ring of the plurality of guide vanes 32 at least forms an avoidance hole 33 at one end close to the reinforcement hub 22, and the trailing edge of the reinforcement hub 22 extends into the avoidance hole 33. The inner ring of the guide vane 32 extends toward the axis of the impeller bracket 21, canceling the guide vane hub located at the inner ring of the guide vane in the prior art, without the obstruction of the guide vane hub, increasing the guide area of ​​the guide vane 32, and enhancing the ability to convert dynamic pressure into static pressure, which is conducive to the pressure increase of the shaftless diagonal flow fan 100.

[0073] Preferably, a plurality of guide vanes 32 are arranged at equal intervals on the circumferential inner wall of the guide vane support 31 to make the air outlet more uniform.

[0074] The shaftless diagonal flow fan 100 adopts a shaftless hub motor, the working area of ​​the diagonal flow blade 23 is increased, the flow channel area is increased, and the air performance is significantly improved; the tip 231 of the diagonal flow blade 23 is connected to the impeller bracket 21 through the blade mounting plate 24, eliminating the tip gap between the diagonal flow blade 23 and the impeller bracket 21, and the airflow drifts to the position of the tip 231 under the action of the centrifugal force of the diagonal flow blade 23, and no tip vortex is formed, thereby reducing the noise of the shaftless diagonal flow fan 100.

[0075] like Fig.14 As shown, the present embodiment further provides a range hood, comprising a chassis 200 and a smoke collecting chamber 300, wherein the chassis 200 is provided with a shaftless oblique flow fan 100 as described above, wherein the motor stator housing 111 of the motor 1 of the shaftless oblique flow fan 100 is connected to the chassis 200, and the guide vane bracket 31 of the shaftless oblique flow fan 100 is connected to the chassis 200 to fix the shaftless oblique flow fan 100; the smoke collecting chamber 300 is arranged at the lower part of the chassis 200, and the impeller air inlet 25 of the shaftless oblique flow fan 100 is arranged toward the smoke collecting chamber 300 and is communicated with the smoke collecting chamber 300.

[0076] When in use, the shaftless oblique flow fan 100 is turned on, smoke is sucked into the smoke collecting chamber 300, and the smoke is discharged after passing through the shaftless oblique flow fan 100, thereby exhausting the smoke.

[0077] The above-mentioned shaftless oblique flow fan 100 is arranged in the chassis 200 of the range hood. The impeller air inlet 25 of the shaftless oblique flow fan 100 is arranged toward the smoke collecting chamber 300 and is connected with the smoke collecting chamber 300. The range hood increases the flow channel area and significantly improves the air performance through the above-mentioned shaftless oblique flow fan 100; the tip gap between the oblique flow blade 23 and the impeller bracket 21 is eliminated, and the air flow drifts to the position of the blade tip 231 under the action of the centrifugal force of the oblique flow blade 23, and no blade tip vortex is formed, thereby reducing the noise of the range hood.

[0078] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Shaftless diagonal flow fan, characterized in that: include: Motor (1); An impeller (2), wherein the impeller (2) is arranged inside the motor (1), and the motor (1) is used to drive the impeller (2) to rotate. The impeller (2) comprises an impeller support (21), a reinforcing hub (22), and a plurality of oblique flow blades (23). The reinforcing hub (22) is inserted into the impeller support (21) and is located at the axial position of the impeller support (21). The plurality of oblique flow blades (23) are arranged at intervals in the circumferential direction of the reinforcing hub (22), and the blade roots of the oblique flow blades (23) are connected to the reinforcing hub (22). The blade tips (231) of the oblique flow blades (23) are connected to blade mounting discs (24), and the blade mounting discs (24) are connected to the impeller support (21).

2. The shaftless diagonal flow fan according to claim 1, characterized in that: The blade tip (231) of each oblique flow blade (23) is connected to a blade mounting plate (24).

3. The shaftless diagonal flow fan according to claim 1, characterized in that: The blade mounting plate (24) is an arc-shaped structure, and the blade mounting plate (24) fits closely to the inner wall of the impeller support (21).

4. The shaftless diagonal flow fan according to claim 1, characterized in that: The blade mounting plate (24) is provided with a first fixing hole (241), the impeller support (21) is provided with a second fixing hole (211) corresponding to the first fixing hole (241), and a fixing member passes through the corresponding second fixing hole (211) and the first fixing hole (241) to connect the blade mounting plate (24) and the impeller support (21).

5. The shaftless diagonal flow fan according to any one of claims 1 to 4, characterized in that: The motor (1) comprises: Motor stator (11); A motor rotor (12) is rotatably disposed in the motor stator (11); the impeller support (21) is connected to the inside of the motor rotor (12) and rotates synchronously with the motor rotor (12).

6. The shaftless diagonal flow fan according to claim 5, characterized in that: One of the motor rotor (12) and the impeller support (21) is provided with a transmission groove (121), and the other of the motor rotor (12) and the impeller support (21) is provided with a transmission protrusion (212), and the transmission protrusion (212) can be inserted into the transmission groove (121).

7. The shaftless diagonal flow fan according to claim 6, characterized in that: The transmission protrusion (212) is provided on the outer wall of the impeller support (21), the transmission protrusion (212) is arranged parallel to the axis of the impeller support (21), and the transmission groove (121) is provided in the motor rotor (12).

8. The shaftless diagonal flow fan according to claim 7, characterized in that: A plurality of transmission protrusions (212) are arranged at equal intervals in the circumferential direction of the impeller support (21), a plurality of transmission grooves (121) are arranged in the motor rotor (12), and the transmission protrusions (212) are matched with the transmission grooves (121) one by one.

9. The shaftless diagonal flow fan according to any one of claims 1 to 4, characterized in that: The reinforced hub (22) is an airfoil hub.

10. A range hood, characterized in that: include: A chassis (200), wherein the chassis (200) is provided with a shaftless diagonal flow fan as claimed in any one of claims 1 to 9; A smoke collecting chamber (300), wherein the smoke collecting chamber (300) is arranged at the lower part of the chassis (200), and the impeller air inlet (25) of the shaftless diagonal flow fan is arranged toward the smoke collecting chamber (300) and is in communication with the smoke collecting chamber (300).

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