Impeller assembly, centrifugal fan and automatic cleaning equipment

Abstract

The utility model discloses an impeller assembly, a centrifugal fan and automatic cleaning equipment, and belongs to the technical field of fans. The impeller assembly comprises a first end cover, a fan blade and a second end cover, and the two end covers are located on the two sides of the fan blade. The fan blade comprises a connecting structure and a plurality of blades, a protruding part is arranged on the side, close to the second end cover, of the second end cover, a first limiting part is arranged on the side wall of the protruding part, and the first limiting part abuts against the side, away from the second end cover, of the connecting structure. The centrifugal fan and the automatic cleaning equipment comprise the impeller assembly. The connecting structure is additionally arranged in the center of the fan blade, the second end cover is provided with the protruding part and the first limiting part, and the first limiting part abuts against the side, away from the second end cover, of the fan blade connecting structure, so that axial limiting of the whole fan blade is achieved, and the stability and reliability of the impeller assembly are enhanced; the fan blades are not easy to separate from the end cover or generate relative shaking, and impeller failure and fan failure are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an impeller assembly, a centrifugal fan and automatic cleaning equipment. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. The impeller is an important structure in the fan. When the fan is started, the impeller is driven to rotate. Through the movement of the impeller, the gas is sucked into the fan and pushed.

[0003] However, during the operation of the fan, under various conditions such as high temperature, large negative pressure, and extremely fast start and stop, the blades in the impeller may separate from the end cover, which can cause impeller failure and fan failure, affecting the normal operation of the equipment. Utility Model Content

[0004] One of the purposes of the embodiment of the utility model is to provide an impeller assembly, which increases the axial limit of the blades, strengthens the bonding strength between the blades and the end cover, improves the reliability of the impeller, and improves the noise problem caused by loose blades.

[0005] The second purpose of the embodiment of the utility model is to provide a centrifugal fan and an automatic cleaning device, which adopt the above-mentioned impeller assembly to improve the reliability of the impeller and reduce the operating noise of the fan.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An impeller assembly comprises a first end cover, a blade and a second end cover; the first end cover and the second end cover are connected to opposite sides of the blade;

[0008] The fan blade comprises a connecting structure and a plurality of blades, wherein the connecting structure is arranged in the middle of the plurality of blades, and the plurality of blades are connected to the connecting structure;

[0009] A protrusion is provided on a side of the second end cover close to the first end cover, a first limiting portion is provided on a side wall of the protrusion, and the first limiting portion abuts against a side of the connection structure away from the second end cover.

[0010] Optionally, the connection structure is provided with an assembly hole, the protrusion is passed through the assembly hole, and the first limiting portion is connected to a portion of the protrusion located outside the assembly hole.

[0011] Optionally, the second end cover, the protruding portion, and the first limiting portion are an integrated piece.

[0012] Optionally, the impeller assembly further includes a shaft sleeve, and the protruding portion and the first limiting portion are both formed on the shaft sleeve;

[0013] The second end cover is provided with a first shaft hole, the sleeve further comprises a connecting portion connected to the protruding portion, the connecting portion is installed in the first shaft hole, the protruding portion is located outside the first shaft hole, and the first limiting portion is located on a side of the connecting structure away from the second end cover;

[0014] The shaft sleeve is provided with a second shaft hole, and the second shaft hole is communicated with the first shaft hole.

[0015] Optionally, the second end cover also includes a second limiting portion and a third limiting portion, the second limiting portion is connected to the hole wall of the first axial hole, and the third limiting portion is connected to the side of the second limiting portion close to the first end cover; the hole wall of the first axial hole, the second limiting portion and the third limiting portion form a slot, and the end of the connecting portion is arranged in the slot.

[0016] Optionally, the fan blade is plugged into the second end cover, and / or the fan blade is plugged into the first end cover;

[0017] The fan blade includes a blade base plate, and the blade includes a first blade portion and a second blade portion connected to each other, wherein the first blade portion is connected to the connecting structure; the second blade portion is located between the blade base plate and the second end cover, and the second blade portion is connected to the blade base plate.

[0018] A centrifugal fan, comprising the impeller assembly as described in the above scheme, and also comprising a power device and a volute;

[0019] The volute has an inner cavity, and is provided with an air inlet and an air outlet communicated with the inner cavity; the impeller assembly is arranged in the inner cavity; and the power device is connected to the impeller assembly to drive the impeller assembly to rotate.

[0020] Optionally, a pre-compression convex portion is provided on a side of the volute close to the power device, and the pre-compression convex portion abuts against the power device;

[0021] And / or, a pre-compression protrusion is provided on a side of the power device close to the volute, and the pre-compression protrusion abuts against the volute.

[0022] Optionally, the volute comprises a first shell and a second shell connected to each other, and the impeller assembly is arranged between the first shell and the second shell;

[0023] The power device is arranged on a side of the second housing away from the second end cover; the power device comprises a motor, the motor has an output shaft, the second end cover is provided with a first shaft hole, the second housing is provided with a shell hole, the output shaft is passed through the shell hole and the first shaft hole, and the output shaft is connected to the second end cover;

[0024] A plurality of the pre-compression protrusions are arranged between the second housing and the power device, and the plurality of the pre-compression protrusions are distributed around the periphery of the output shaft.

[0025] Optionally, the power device further comprises a bushing, the bushing is sleeved on the output shaft; the second housing is provided with a pre-pressing protrusion, the bushing abuts against the pre-pressing protrusion; and / or the bushing is provided with a pre-pressing protrusion, the pre-pressing protrusion abuts against the second housing;

[0026] The power device also includes a mounting plate, the motor is connected to the mounting plate, and the mounting plate is connected to the second housing via fasteners.

[0027] Optionally, an annular protrusion is provided on a side of the second shell facing away from the first shell, the annular protrusion is located at the periphery of the shell hole, an assembly step is defined between the annular protrusion and the second shell, and the bushing is inserted into the assembly step.

[0028] An automatic cleaning device comprises the centrifugal fan of the above scheme.

[0029] The beneficial effects of the utility model are as follows: in the impeller assembly, a connecting structure is added to the middle part of the fan blade, and a protrusion and a first limiting portion are provided on the second end cover, and the first limiting portion abuts against the side of the fan blade connecting structure away from the second end cover, thereby realizing axial limitation of the fan blade as a whole and enhancing the stability and reliability of the impeller assembly.

[0030] The centrifugal fan and automatic cleaning equipment adopt the aforementioned impeller assembly, which strengthens the axial fixation of the fan blades and the bonding strength between the fan blades and the end cover. Under various conditions such as high temperature, large negative pressure, and extreme start and stop, the fan blades are not easily separated from the end cover or produce relative shaking, thereby avoiding impeller failure and fan failure, improving the stability and reliability of the fan, improving the noise problem caused by vibration, and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The utility model is further described in detail below based on the drawings and embodiments.

[0032] Figure 1 This is one of the structural schematic diagrams of the impeller assembly described in the embodiment of the utility model;

[0033] Figure 2 This is the second structural schematic diagram of the impeller assembly according to the embodiment of the utility model;

[0034] Figure 3 This is one of the structural exploded schematic diagrams of the impeller assembly according to the embodiment of the utility model;

[0035] Figure 4This is the second schematic diagram of the structural decomposition of the impeller assembly according to the embodiment of the utility model;

[0036] Figure 5 for Figure 4 A magnified view of part A in FIG.

[0037] Figure 6 for Figure 4 A magnified view of part B in FIG.

[0038] Figure 7 This is one of the cross-sectional views of the impeller assembly described in the embodiment of the utility model (the raised portion and the second end cover in the figure are separate structures);

[0039] Figure 8 for Figure 7 The enlarged view of the C part in FIG.

[0040] Fig. 9 This is a schematic diagram of the internal structure of the impeller assembly according to an embodiment of the utility model;

[0041] Fig.10 for Fig. 9 The enlarged view of the D part in FIG.

[0042] Fig.11 This is a schematic diagram of the structure of the shaft sleeve according to an embodiment of the utility model;

[0043] Fig.12 This is a schematic diagram of the structure of the second end cover of an embodiment of the utility model;

[0044] Fig.13 for Fig.12 The enlarged view of part E in FIG.

[0045] Fig.14 This is the second cross-sectional view of the impeller assembly according to the embodiment of the utility model (the raised portion and the second end cover are an integrated structure in the figure);

[0046] Fig.15 for Fig.14 The enlarged view of the F part in the figure;

[0047] Fig.16 This is one of the structural schematic diagrams of the volute in the centrifugal fan according to the embodiment of the utility model;

[0048] Fig.17 This is the second structural schematic diagram of the volute in the centrifugal fan according to the embodiment of the utility model;

[0049] Fig.18 for Fig.17 The enlarged view of the G section in the figure;

[0050] Fig.19 This is a schematic diagram of the structure of the power device in the centrifugal fan according to an embodiment of the utility model;

[0051] Fig. 20 This is a schematic diagram of the assembly of the volute and the power device in the centrifugal fan according to the embodiment of the utility model;

[0052] Fig.21 for Fig. 20 The enlarged view of the H part in FIG.

[0053] Fig. 22 It is a schematic diagram of the assembly of the second end cover, the volute and the power device in the centrifugal fan described in the embodiment of the utility model.

[0054] In the figure: 100, impeller assembly; 200, volute; 2001, air inlet; 2002, air outlet; 2003, second mounting hole; 300, power device; 3001, first mounting hole; 10, first end cover; 20, fan blade; 201, first plug-in portion; 202, second plug-in portion; 21, connecting structure; 211, assembly hole; 22, blade; 221, first blade portion; 222, second blade portion; 23, blade base Plate; 30, second end cover; 301, first axial hole; 302, slot; 31, second limiting portion; 32, third limiting portion; 40, bushing; 401, second axial hole; 41, protrusion; 42, first limiting portion; 43, connecting portion; 51, first shell; 52, second shell; 521, shell hole; 61, pre-load protrusion; 62, annular protrusion; 70, motor; 71, output shaft; 80, mounting plate; 90, bushing. DETAILED DESCRIPTION

[0055] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0056] In the description of the present invention, unless otherwise clearly specified and limited, the terms "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] The impeller of a centrifugal fan includes blades and end covers. In some technologies, the blades and end covers are designed separately, so that the blades and end covers can be manufactured and processed separately, making it easier to achieve complex shapes and precision requirements. In addition, the split design is also convenient for maintenance and replacement. When the blades or end covers are damaged, they can be replaced separately without replacing the entire impeller.

[0059] However, in working environments with high temperature, large negative pressure, and rapid start and stop, the connection between the blades and the end cover may have problems due to various factors, causing the blades and the end cover to loosen or separate, which in turn causes impeller failure and fan failure. For example, in a high temperature environment, the fan material will expand thermally, and the thermal expansion coefficients of the end cover and blade materials may not match, or the blades and end cover need to withstand large tensile forces under large negative pressure conditions, or when the fan is started and stopped rapidly, there will be huge impact forces and vibrations between the blades and the end cover. In all of the above cases, the blades and the end cover may loosen or separate.

[0060] Based on this, please refer to Figures 1 to 22 The present application proposes an impeller assembly 100, in which a connecting structure 21 is added to the middle area of ​​a plurality of blades 22, and the second limiting portion 31 is pressed against the side of the connecting structure 21 away from the second end cover 30 to achieve axial limitation of the blade 20. Moreover, the position of the axial limitation is close to the central axis of the blade 20, and the limiting effect is good. This method effectively constrains and fixes the blade 22 in the axial direction, making it difficult for the blade 22 to move or shake in the axial direction, making the connection between the blade 22 and the end cover more stable and firm, and improving the problem of shaking or separation between the blade 22 and the end cover.

[0061] The present application also proposes a centrifugal fan and an automatic cleaning device. By adopting the aforementioned impeller assembly 100, the axial limitation of the fan blade 20 can be strengthened, and the shaking or separation between the blade 22 and the end cover can be improved or overcome. Reducing the shaking can effectively reduce the noise generated by vibration, and the user experience is better.

[0062] Among them, the automatic cleaning equipment can be but is not limited to a sweeper, a vacuum cleaner, a washing and mopping machine, and a hair dryer; the automatic cleaning equipment can be a small household cleaning equipment or a large commercial cleaning equipment.

[0063] Please refer to Figures 1 to 22 , the impeller assembly 100 and the centrifugal fan of the present application are described below by taking the application of the impeller assembly 100 to a centrifugal fan as an example.

[0064] The centrifugal fan includes a volute 200, an impeller assembly 100 and a power device 300. The volute 200 has an inner cavity, such as Fig.16 The volute 200 is also provided with an air inlet 2001 and an air outlet 2002 communicating with the inner cavity. The impeller assembly 100 is provided in the inner cavity of the volute 200. The power device 300 is connected to the impeller assembly 100. The power device 300 is used to drive the impeller assembly 100 to rotate around the central axis of the impeller. When the impeller assembly 100 rotates, external air enters from the air inlet 2001 of the volute 200, passes through the air duct between adjacent blades 22 in the impeller assembly 100, and is discharged from the air outlet 2002 of the volute 200.

[0065] The impeller assembly 100 includes a first end cover 10, a fan blade 20 and a second end cover 30. Figure 3 , Figure 4 , Figures 7 to 10 In the axial direction of the impeller assembly 100 , the first end cover 10 and the second end cover 30 are arranged on opposite sides of the fan blade 20 . The first end cover 10 and the second end cover 30 cooperate with the fan blade 20 to form an air duct and also play a role in supporting the fan blade 20 .

[0066] The fan blades 20 include a plurality of blades 22, which are arranged around the central axis of the impeller to form an air duct between adjacent blades 20, and each blade 22 can be configured to extend spirally around the central axis of the impeller. Figure 4 , Figure 5 As shown, the fan blade 20 also includes a connecting structure 21, which is arranged in the middle of the multiple blades 22. The end of the multiple blades 22 close to the central axis of the impeller is the inner end of the blade 22, and the inner ends of the multiple blades 22 are connected to the connecting structure 21.

[0067] It should be noted that the inner ends of all blades 22 may be connected to the connection structure 21 , or only the inner ends of some blades 22 may be connected to the connection structure 21 .

[0068] Optionally, the connection structure 21 is formed at the inner ends of the plurality of blades 22. In other words, the connection structure 21 and the plurality of blades 22 are an integral structure. The connection structure 21 and the plurality of blades 22 may be connected by integral molding or by secondary molding. It is understandable that the connection structure 21 and the blades 22 are an integral structure, which can improve the structural strength of the connection between the connection structure 21 and the ends of the blades 22, and it is not easy for the blades 22 and the connection structure 21 to be misaligned or broken, thereby achieving reliable transmission of force. In other embodiments, the blades 22 may also be connected to the connection structure 21 in other ways.

[0069] Please continue to refer to Figure 6 , Figures 7 to 10 , Figure 14 to Figure 15 A protruding protrusion 41 is provided on a side of the second end cover 30 close to the first end cover 10, and a first limiting portion 42 is provided on the side wall of the protrusion 41. An assembly groove is defined between the protrusion 41, the first limiting portion 42 and the second end cover 30. The connecting structure 21 is inserted into the assembly groove, and the first limiting portion 42 abuts against a side of the connecting structure 21 away from the second end cover 30, and the axial position of the connecting structure 21 is limited by the first limiting portion 42.

[0070] Optionally, the connecting structure 21 abuts against the second end cover 30 on one side and the first limiting portion 42 on the other side on the axial direction of the impeller, thereby effectively limiting the axial position of the connecting structure 21, thereby maintaining the stability of the axial position of the fan blades 20. Under various conditions such as high temperature, large negative pressure, and extreme start and stop, the blades 22 in the impeller are not easy to separate from the end cover.

[0071] For ease of understanding, taking the first end cover 10 as the upper end cover and the second end cover 30 as the lower end cover as an example, the first end cover 10 is arranged on the upper side of the fan blade 20, and the second end cover 30 is arranged on the lower side of the fan blade 20, the protrusion 41 extends axially upward relative to the second end cover 30, and the first limiting portion 42 extends radially relative to the protrusion 41, and the lower side surface of the first limiting portion 42 abuts against the upper side surface of the connecting structure 21.

[0072] Optionally, the outer area of ​​the fan blade 20 can be connected to the second end cover 30 by fastener connection, plug-in connection, etc.

[0073] In the related art, the center of multiple blades 22 is vacant, that is, the inner ends of multiple blades 22 are disconnected and not connected to each other, and the part where the blade 22 is connected to the end cover is generally close to the outer end of the blade 22. When the fan is working, the blade 22 and the end cover may separate or shake relatively. In the present application, a connecting structure 21 connected to the inner end of the blade 22 is added to the central area of ​​the blade 22, and the first limiting portion 42 provided on the second end cover 30 is pressed on the side of the connecting structure 21 away from the second end cover 30, thereby strengthening the connection between the central area of ​​the fan blade 20 and the central area of ​​the second end cover 30, so that the fixing effect of the inner end of the blade 22 is improved, thereby effectively strengthening the axial limit of the fan blade 20 as a whole. When the fan is working, the fan blade 20 is not easy to separate from the second end cover 30, which improves the stability and reliability of the impeller assembly 100, avoids impeller failure and fan failure, improves noise problems, and improves user experience.

[0074] Optionally, the first end cover 10 is close to the air inlet 2001 of the volute 200, and the second end cover 30 is close to the power output device. The power device 300 has an output shaft 71, which is connected to the central position of the second end cover 30 to drive the entire impeller assembly 100 to rotate through the output shaft 71. Fig. 22 The first end cover 10 and the blade 20 are omitted, and the middle part of the second end cover 30 is shown to be connected to the output shaft 71 of the power device 300. In the area near the output shaft 71, the blade 20 is subjected to a larger force. By strengthening the axial limit of the blade 22 from the middle area, the connection strength between the blade 20 and the second end cover 30 is improved. In this way, when the output shaft 71 runs at a high speed, the blade 22 near the output shaft 71 is not easy to separate from the second end cover 30.

[0075] In one embodiment, if Figures 4 to 6 , Figure 8 , Fig.10 , Fig.15 As shown, on the basis that the first limiting portion 42 abuts against the connection structure 21, in order to facilitate installation, an assembly hole 211 is provided on the connection structure 21. Among them, the connection structure 21 is provided with the assembly hole 211, and the first limiting portion 42 is an extension portion extending outward relative to the outer wall of the protruding portion 41. The protruding portion 41 passes through the assembly hole 211 so that the end of the protruding portion 41 protrudes out of the assembly hole 211, and the first limiting portion 42 is connected to the portion of the protruding portion 41 protruding out of the assembly hole 211, so that the first limiting portion 42 is pressed against the side of the connection structure 21 away from the second end cover 30.

[0076] Optionally, when the protrusion 41 passes through the assembly hole 211 of the connection structure 21 , both the second end cover 30 and the protrusion 41 are provided with shaft holes, and the shaft holes are used to assemble the output shaft 71 of the power device 300 .

[0077] The first position limiting portion 42 extending in the radial direction can be formed at the end of the protruding portion 41 by riveting or bending the protruding portion 41. Alternatively, a nut can be directly mounted on the protruding portion 41, and the nut is blocked on the side of the connecting structure 21 away from the second end cover 30, and the nut is used as the first position limiting portion 42. In other embodiments, the first position limiting portion 42 can also be provided by other methods.

[0078] Optionally, the connection structure 21 is an annular structure connected end to end, that is, the connection structure 21 is a connection ring, so that the inner ends of all blades 22 can be connected to the outer wall of the connection ring to reliably limit the inner ends of all blades 22 in the axial direction. In other embodiments, the connection structure 21 can also be a semicircular ring, a 3 / 4 circular ring structure, etc., or the connection structure 21 can also include a plurality of arc structures arranged at intervals.

[0079] In other embodiments, the protrusion 41 may not pass through the connection structure 21, and the protrusion 41 passes through the air duct between adjacent blades 20, so that the first limit portion 42 connected to the end of the protrusion 41 is located on the side of the connection structure 21 away from the second end cover 30. In order to improve the structural strength, multiple protrusions 41 may be provided, and the multiple protrusions 41 respectively pass through the air ducts between multiple adjacent blades 20. The first limit portion 42 may be formed on the protrusion 41 by riveting, bending, and other processes.

[0080] For ease of understanding, the following continues to describe the impeller assembly 100 by taking the example that the connection structure 21 is provided with the assembly hole 211 and the protrusion 41 is passed through the assembly hole 211 .

[0081] In the present application, the second end cover 30 is provided with the protruding portion 41 , and the protruding portion 41 is provided with the first limiting portion 42 , which can be realized by at least the following configurations.

[0082] Configuration method 1:

[0083] like Fig.14 , Fig.15 As shown, the second end cover 30, the protruding portion 41, and the first limiting portion 42 are an integrated part. An integrated part refers to an integrated structure, and the structural strength of the integrated part is high.

[0084] Optionally, the second end cover 30 is integrally connected to the protrusion 41, and the protrusion 41 is integrally connected to the first limiting portion 42. It is understandable that when the second end cover 30 is manufactured, the protrusion 41 can be first formed on the main structure of the second end cover 30 by injection molding, casting, stretching, etc., and then, when the second end cover 30 and the fan blade 20 are assembled, the protrusion 41 is passed through the assembly hole 211 of the connecting structure 21 of the fan blade 20, and then the first limiting portion 42 that is folded and extended outward is formed at the part of the protrusion 41 extending out of the connecting structure 21 by riveting, bending, etc.

[0085] Configuration method 2:

[0086] like Figures 7 to 13 As shown, the protruding portion 41 and the first limiting portion 42 are an integrated part.

[0087] The impeller assembly 100 further includes a sleeve 40, on which a protrusion 41 and a first stopper 42 are formed, that is, the protrusion 41 is a part of the sleeve 40, and the first stopper 42 is a part of the sleeve 40. In the impeller assembly 100, the second end cover 30 and the sleeve 40 are separate structures, and the sleeve 40 is mounted on the second end cover 30.

[0088] The shaft sleeve 40 is installed on the second end cover 30 , and a protrusion 41 and a first limiting portion 42 are provided, so that the installation is convenient, the assembly cost is reduced, and the maintenance is convenient.

[0089] Reference Fig.11 The sleeve 40 includes a sleeve, and the first limiting portion 42 is located on the outer wall of the sleeve. The protruding portion 41 is a part of the sleeve, and the sleeve also includes a connecting portion 43, and the connecting portion 43 is connected to the protruding portion 41. Fig.12 , Fig.13 The second end cover 30 is provided with a first shaft hole 301, and the connecting portion 43 of the sleeve 40 is inserted into the first shaft hole 301, and the sleeve 40 is connected to the second end cover 30 through the connecting portion 43. The sleeve of the sleeve 40 extends out of the first shaft hole 301 and the portion protruding relative to the second end cover 30 is the protruding portion 41.

[0090] The sleeve of the sleeve 40 is provided with a second shaft hole 401, and the second shaft hole 401 includes a shaft hole provided at the connecting portion 43 of the sleeve 40, and a shaft hole provided at the protruding portion 41 of the sleeve 40. The second shaft hole 401 is communicated with the first shaft hole 301, and the output shaft 71 of the power device 300 is passed through the first shaft hole 301, and the output shaft 71 is connected to the second end cover 30 by means of interference fit, key fit, etc., to transmit torque. Optionally, the output shaft 71 of the power device 300 is also passed through the second shaft hole 401, and the output shaft 71 is connected to the sleeve 40 by means of interference fit, key fit, etc., to transmit torque.

[0091] Optionally, the sleeve 40 is made of metal. The sleeve 40 is a metal sleeve. The metal structure can provide higher structural strength, which can not only improve the axial limiting stability of the first limiting portion 42 of the sleeve 40 on the fan blade 20, but also improve the connection strength between the sleeve 40 and the second end cover 30. The material of the sleeve 40 can be but is not limited to copper. In other embodiments, the sleeve 40 can also be made of plastic material, etc.

[0092] Optionally, refer to Fig.13In order to facilitate the installation of the shaft sleeve 40 and to strengthen the connection strength between the shaft sleeve 40 and the second end cover 30, the second end cover 30 also includes a second limiting portion 31 and a third limiting portion 32. Among them, the second limiting portion 31 is connected to the hole wall of the first shaft hole 301, and the second limiting portion 31 extends inward from the hole wall of the first shaft hole 301. The third limiting portion 32 is connected to the side of the second limiting portion 31 close to the first end cover 10, and the third limiting portion 32 is spaced from the hole wall of the first shaft hole 301. In this way, a slot 302 is formed between the hole wall of the first shaft hole 301, the wall surface of the second limiting portion 31, and the wall surface of the third limiting portion 32, and the end of the connecting portion 43 of the shaft sleeve 40 is inserted into the slot 302.

[0093] Taking the first end cover 10 as the upper end cover and the second end cover 30 as the lower end cover as an example, a method for installing the sleeve 40 is provided: the connection structure 21 of the fan blade 20 is placed on the upper side of the second end cover 30, the assembly hole 211 of the connection structure 21 is aligned with the first shaft hole 301 of the second end cover 30, the sleeve 40 is inserted downward, and the sleeve is inserted into the first shaft hole 301 through the assembly hole 211 until the end of the sleeve is against the second limiting portion 31. After the sleeve 40 is installed in place, the first limiting portion 42 at the top of the sleeve of the sleeve 40 can be against the upper side of the connection structure 21. The second limiting portion 31 is located on the lower side of the sleeve 40, and the third limiting portion 32 is located on the inner side of the sleeve 40, which plays a role in limiting the end of the sleeve 40, ensuring the stable position of the sleeve 40, thereby ensuring the reliable fixation of the connection structure 21 by the first limiting portion 42 of the sleeve 40. This installation method is convenient and quick, and the first limiting portion 42 can be formed on the shaft sleeve 40 during the part manufacturing stage, without the need to rivet the first limiting portion 42 during the assembly process.

[0094] Of course, in other embodiments, the sleeve 40 may also be installed in other ways.

[0095] Optionally, an outer wall of the connecting portion 43 of the sleeve 40 is provided with an external spline, and an inner spline is provided on the hole wall of the first shaft hole 301, and the connection between the external spline and the inner spline is realized to realize the connection between the sleeve 40 and the second end cover 30. In other embodiments, the connection between the sleeve 40 and the second end cover 30 can also be realized by interference fit between the connecting portion 43 of the sleeve 40 and the first shaft hole 301.

[0096] Configuration method three (not shown in the figure):

[0097] The second end cover 30 and the protruding portion 41 are an integral part, the limiting member serves as the first limiting portion 42, and the second end cover 30 and the limiting member are two separate parts. The limiting member is connected to the end of the protruding portion 41 by threaded connection, plug-in connection, etc.

[0098] Configuration method 4 (not shown in the figure):

[0099] The protruding piece is used as the protruding portion 41, the limiting piece is used as the first limiting portion 42, and the second end cover 30, the protruding piece, and the limiting piece are three separate parts. The protruding piece is connected to the second end cover 30 by threaded connection, plug-in connection, etc., and the limiting piece is connected to the end of the protruding piece by threaded connection, plug-in connection, etc.

[0100] It is understandable that in addition to the above-mentioned configuration methods one to four, the protrusion 41 and the first limiting portion 42 can also be configured in other ways, as long as after the second end cover 30 and the fan blade 20 are assembled, the first limiting portion 42 can be abutted against the side of the connecting structure 21 away from the second end cover 30, and the first limiting portion 42 is connected to the second end cover 30 through the protrusion 41.

[0101] Please continue to refer to Figure 3 , Figure 4 , Figure 7 , Fig. 9 The fan blade 20 includes a blade base plate 23, and the blade 22 includes a first blade portion 221 and a second blade portion 222 adjacent to each other. The inner end of the first blade portion 221 is connected to the connecting structure 21, and the outer end of the first blade portion 221 is connected to the second blade portion 222. Figures 7 to 10 , the second blade 222 is connected to the blade base plate 23. The first end cover 10 is provided with an end cover opening, the blade base plate 23 is provided with a base plate opening, the first blade 221 is located at the base plate opening, and after the gas enters the fan from the air inlet 2001 of the volute 200, it passes through the end cover opening, the base plate opening, the air duct between adjacent first blades 221, and the air duct between adjacent second blades 222, and is pushed out from the air outlet 2002 of the volute 200.

[0102] In one embodiment, the fan blade 20 is connected to the second end cover 30. Optionally, the fan blade 20 is plugged into the second end cover 30, wherein the plugging described in this application includes inserting the plug block into the slot 302, snap-fitting, etc.

[0103] Optionally, the connection between the fan blade 20 and the second end cover 30 is achieved by plugging the blade 22, the second blade portion 222 and the second end cover 30. Figure 3 , Figure 4 , Figure 7 , Fig. 9 As shown, a protruding second plug-in portion 202 is provided on one side of the second blade portion 222 of the plurality of blades 22 close to the second end cover 30, and the second plug-in portion 202 is a convex block. Correspondingly, a plurality of second plug-in portions 202 surrounding the central axis of the impeller are provided on the second end cover 30, and the plurality of second plug-in portions 202 correspond one-to-one to the plurality of second plug-in portions, and the second plug-in portions 202 are inserted into the second plug-in portions to realize the plug-in connection between the fan blades 20 and the second end cover 30.

[0104] In other embodiments, a protruding plug-in portion may be provided on one side of the blade base plate 23 close to the second end cover 30 to be plugged with the second end cover 30. It is understandable that the blade 22 is closer to the second end cover 30, and the second blade portion 222 of the blade 22 is plugged with the second end cover 30, which is more concise and reliable than the way in which the blade base plate 23 is plugged with the second end cover 30.

[0105] It is understandable that the separate design of the fan blade 20 and the second end cover 30 is easy to manufacture and repair. However, the inventor found that if the fan blade 20 and the second end cover 30 are connected only by plugging, under high temperature, large negative pressure, and extremely fast start and stop conditions, the end cover and the blade 22 may be separated, resulting in impeller failure. In this embodiment, the middle area of ​​the fan blade 20 is abutted and limited by the first limiting portion 42, and the outer ring area of ​​the fan blade 20 is plugged into the second end cover 30, so that the middle area and the outer area of ​​the fan blade 20 can be reliably fixed. When the second end cover 30 is connected to the output shaft 71 of the power device 300, the axial limitation of the fan blade 20 close to the rotation axis area can be strengthened by the first limiting portion 42, effectively preventing the fan blade 20 from separating from the second end cover 30.

[0106] In one embodiment, the blade base plate 23 of the fan blade 20 is connected to the first end cover 10; optionally, the blade base plate 23 of the fan blade 20 is plugged into the first end cover 10. In other embodiments, the fan blade 20 has a blade base plate 23, and the blade base plate 23 is connected to the first end cover 10 in an integral manner.

[0107] Optionally, the connection between the fan blade 20 and the first end cover 10 is achieved by plugging the blade base plate 23 into the first end cover 10. Figure 3 , Figure 4 , Figure 7 , Fig. 9 As shown, a protruding first plug-in portion 201 is provided on one side of the blade base plate 23 close to the first end cover 10, and the first plug-in portion 201 is a convex block. Correspondingly, a plurality of first plug-in holes surrounding the central axis of the impeller are provided on the first end cover 10, and the plurality of first plug-in portions 201 correspond to the plurality of first plug-in holes one by one, and the first plug-in portion 201 is inserted into the first plug-in hole to achieve the plug-in connection between the fan blade 20 and the first end cover 10. It can be understood that, by plugging the blade base plate 23 with the first end cover 10, compared with the plug-in connection between the first blade portion 221 of the blade 22 and the first end cover 10, it is possible to avoid the plug-in structure occupying the end cover opening of the first end cover 10 and the base plate opening of the blade base plate 23 as much as possible, thereby reducing the impact on the air intake.

[0108] In one embodiment, referring to Figure 1 , Figure 3In order to improve the air supply efficiency, a plurality of lower blades 22 are further provided on the side of the second end cover 30 away from the first end cover 10. Of course, in other embodiments, the second end cover 30 may not be provided with blades 22.

[0109] In the related art, the connection strength between the power device 300 and the volute 200 is insufficient. When the fan is running at high speed or starting and stopping at high speed, relative vibration may occur between the power device 300 and the volute 200, thereby causing noise problems.

[0110] In order to solve the problem of vibration generated between the power device 300 and the volute 200, in one embodiment, a plurality of pre-stressing structures are further arranged between the power device 300 and the volute 200. The pre-stressing structures are clamped between the power device 300 and the volute 200 to strengthen the tightness of fit between the power device 300 and the volute 200 in the axial direction of the fan, reduce the relative vibration between the power device 300 and the volute 200, and improve the noise problem.

[0111] Optionally, the power device 300 and the volute 200 are fastened by a plurality of fasteners. It is understandable that, when the fasteners lock the power device 300 and the volute 200 axially, the pre-compression structure between the power device 300 and the volute 200 uses the assembly interference in size to effectively transmit the axial force between the power device 300 and the volute 200, so that the power device 300 and the volute 200 can support each other and be tightly pressed together to reduce vibration and noise.

[0112] Regarding the setting of the pre-compression structure, the pre-compression structure may be set on a side of the volute 200 close to the power device 300 , or may be set on a side of the power device 300 close to the volute 200 .

[0113] In one embodiment, please refer to Fig.17 , Fig.18 A pre-compression convex portion 61 is provided on one side of the volute 200 close to the power device 300. The pre-compression convex portion 61 is a pre-compression structure. Fig. 20 , Fig.21 When the power device 300 is installed on the volute 200 , the pre-compression protrusion 61 abuts against the power device 300 .

[0114] Optionally, when the volute 200 is provided with a pre-compression protrusion 61, the second housing 52 is provided with a pre-compression protrusion 61 on a side close to the power device 300, and the pre-compression protrusion 61 is a rib formed on the second housing 52, and the rib extends radially. In other embodiments, the pre-compression protrusion 61 may also be a hemispherical protrusion, etc.

[0115] Optionally, when the pre-pressing protrusion 61 is provided on the second shell 52, the second shell 52 is a plastic structure, and a plurality of plastic protrusions can be directly molded as the pre-pressing protrusion 61 on the side of the second shell 52 away from the first shell 51 by injection molding, wherein the material of the pre-pressing protrusion 61 is also plastic, and the plastic has a certain deformation ability. In other embodiments, silicone or rubber protrusions can also be molded as the pre-pressing protrusion 61 on the side of the second shell 52 away from the first shell 51 by secondary injection molding, providing better elastic deformation ability.

[0116] In other embodiments, a pre-stressing protrusion is provided on one side of the power device 300 close to the volute 200 , and the pre-stressing protrusion is a pre-stressing structure. When the power device 300 is installed on the volute 200 , the pre-stressing protrusion abuts against the volute 200 .

[0117] Please continue to refer to Figure 1 , Figure 2 , Fig. 20 , Fig. 22 The volute 200 includes a first shell 51 and a second shell 52 connected to each other. The first shell 51 and the second shell 52 enclose an inner cavity, and the impeller assembly 100 is disposed between the first shell 51 and the second shell 52. At least a portion of the first shell 51 is located on a side of the first end cover 10 away from the second end cover 30, and at least a portion of the second shell 52 is located on a side of the second end cover 30 away from the first end cover 10.

[0118] The power device 300 is arranged on the side of the second housing 52 away from the impeller assembly 100 and away from the first housing 51. The power device 300 includes a motor 70, which is installed on the volute 200, and the motor 70 has an output shaft 71. The first end cover 10 is provided with a first shaft hole 301, and the second housing 52 is provided with a shell hole 521. The output shaft 71 is penetrated through the shell hole 521 and the first shaft hole 301. The outer wall of the output shaft 71 is gap-matched with the hole wall of the shell hole 521, and the outer wall of the output shaft 71 is in contact with the hole wall of the first shaft hole 301. The output shaft 71 is connected to the second end cover 30, so that the rotational power is transmitted to the second end cover 30 through the output shaft 71 of the motor 70, thereby driving the entire impeller assembly 100 to rotate.

[0119] The output shaft 71 may be connected to the second end cover 30 by interference fit, key bonding, spline bonding, etc.

[0120] Please continue to refer to Fig.17 , Fig.18A plurality of pre-compression convex portions 61 are provided between the second housing 52 and the power device 300, and the plurality of pre-compression convex portions 61 are distributed around the housing hole 521, that is, the plurality of pre-compression convex portions 61 are distributed around the output shaft 71. In other words, the plurality of pre-compression convex portions 61 are distributed at intervals around the output shaft 71. In this way, pressure can be formed in the middle of the volute 200 and the power device 300, and the volute 200 and the power device 300 can also be closely matched in the middle area close to the output shaft 71, thereby improving the stability of the power device 300 and the volute 200.

[0121] In some embodiments, Fig.19 As shown, the power device 300 is provided with a plurality of first mounting holes 3001, such as Fig.17 As shown, the second shell 52 of the volute 200 is provided with a plurality of second mounting holes 2003, and the plurality of second mounting holes 2003 correspond one-to-one to the plurality of first mounting holes 3001, and the fasteners pass through the first mounting holes 3001 and penetrate into the second mounting holes 2003 to connect the power device 300 with the volute 200 through the fasteners.

[0122] Optionally, the edge area and the middle area of ​​the power device 300 can be stably assembled with the volute 200, and multiple fasteners are distributed on the outside of multiple pre-stressing protrusions 61, so that the outer edge area of ​​the power device 300 can be locked by means of the fasteners, and the part of the power device 300 close to the output shaft 71 can rely on the pre-stressing protrusion 61 to achieve a tight press fit with the second shell 52.

[0123] In other embodiments, pre-compression protrusions 61 may also be provided on the outer sides of the plurality of fasteners.

[0124] Please continue to refer to Figures 19 to 22 The power device 300 further includes a mounting plate 80 and a bushing 90. The motor 70 is connected to the mounting plate 80, and the mounting plate 80 is connected to the second housing 52 through a fastener. The bushing 90 is sleeved on the output shaft 71, and the bushing 90 is provided with a sleeve hole, and the output shaft 71 passes through the sleeve hole of the bushing 90. A bearing is provided between the inner wall of the sleeve hole and the outer wall of the output shaft 71, and the output shaft 71 can rotate relative to the bushing 90. Among them, the bushing 90 can be made of, but not limited to, metal.

[0125] In one embodiment, the pre-compression protrusion 61 is disposed between the second housing 52 and the bushing 90. The bushing 90 is assembled with the output shaft 71 through a bearing, and when the power device 300 is installed on the second housing 52 by fasteners, the pre-compression protrusion 61 between the bushing 90 and the second housing 52 allows the two to be tightly pressed together, thereby strengthening the position close to the output shaft 71 and enhancing the installation stability of the power device 300.

[0126] Alternatively, if Fig.17 , Fig.18 , Fig.21As shown, the bushing 90 is arranged on the side of the second housing 52 away from the first housing 51, and the side of the second housing 52 away from the first housing 51 is provided with a pre-compression protrusion 61, and the bushing 90 abuts against the pre-compression protrusion 61. Taking the example that the first housing 51 is the upper housing and the second housing 52 is the lower housing, the lower side of the second housing 52 is provided with a protruding pre-compression protrusion 61, and the upper side of the bushing 90 abuts against the pre-compression protrusion 61.

[0127] In other embodiments, the bushing 90 is disposed on a side of the second housing 52 away from the first housing 51 (not shown in the figure), and the bushing 90 is provided with a pre-compression protrusion 61, which abuts against the second housing 52. Taking the example that the first housing 51 is an upper housing and the second housing 52 is a lower housing, a protruding pre-compression protrusion 61 is provided on the upper side of the bushing 90, and the pre-compression protrusion 61 abuts against the lower side of the second housing 52.

[0128] It should be noted that in some embodiments, when a pre-stressing protrusion 61 is provided between the second shell 52 and the bushing 90, the pre-stressing protrusion 61 has a certain elasticity. When the fastener locks the power device 300 and the second shell 52, the second shell 52 and the bushing 90 may also be in contact with each other under the action of the locking force.

[0129] In one embodiment, please continue to refer to Fig.17 , Fig.18 , Figure 20 to Figure 22 An annular protrusion 62 is provided on the side of the second shell 52 facing away from the first shell 51. The annular protrusion 62 surrounds the periphery of the shell. An assembly step is defined between the inner wall surface of the annular protrusion 62 and the wall surface of the second shell 52 facing away from the first shell 51. The bushing 90 is inserted into the assembly step, and the annular protrusion 62 limits the radial movement of the bushing 90. In this embodiment, the axial pressing tightness and stability between the middle area of ​​the power device 300 and the volute 200 are enhanced by the pre-compression protrusion 61; the stability of the radial position of the bushing 90 is limited by the annular protrusion 62, so that the bushing 90 can be closely matched with the second shell 52 through the pre-compression protrusion 61. The installation stability between the power device 300 and the volute 200 is higher.

[0130] In other embodiments, the annular protrusion 62 may not be provided.

[0131] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships 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.

[0132] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0133] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0134] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. An impeller assembly, characterized in that: The invention comprises a first end cover (10), a fan blade (20) and a second end cover (30); the first end cover (10) and the second end cover (30) are connected to opposite sides of the fan blade (20); The fan blade (20) comprises a connecting structure (21) and a plurality of blades (22), wherein the connecting structure (21) is arranged in the middle of the plurality of blades (22), and the plurality of blades (22) are connected to the connecting structure (21); A protrusion (41) is provided on a side of the second end cover (30) close to the first end cover (10), a first limiting portion (42) is provided on a side wall of the protrusion (41), and the first limiting portion (42) abuts against a side of the connecting structure (21) facing away from the second end cover (30).

2. The impeller assembly according to claim 1, characterized in that: The connection structure (21) is provided with an assembly hole (211), the protrusion (41) is passed through the assembly hole (211), and the first limiting portion (42) is connected to a portion of the protrusion (41) located outside the assembly hole (211).

3. The impeller assembly according to claim 1, characterized in that: The second end cover (30), the protruding portion (41), and the first limiting portion (42) are an integrated part.

4. The impeller assembly according to claim 1, characterized in that: The impeller assembly (100) further comprises a shaft sleeve (40), and the protruding portion (41) and the first limiting portion (42) are both formed on the shaft sleeve (40); The second end cover (30) is provided with a first axial hole (301), the shaft sleeve (40) further comprises a connecting portion (43) connected to the protruding portion (41), the connecting portion (43) is installed in the first axial hole (301), the protruding portion (41) is located outside the first axial hole (301), and the first limiting portion (42) is located on a side of the connecting structure (21) away from the second end cover (30); The shaft sleeve (40) is provided with a second shaft hole (401), and the second shaft hole (401) is communicated with the first shaft hole (301).

5. The impeller assembly according to claim 4, characterized in that: The second end cover (30) further comprises a second limiting portion (31) and a third limiting portion (32), wherein the second limiting portion (31) is connected to the hole wall of the first axial hole (301), and the third limiting portion (32) is connected to a side of the second limiting portion (31) close to the first end cover (10); the hole wall of the first axial hole (301), the second limiting portion (31) and the third limiting portion (32) form a slot (302), and the end of the connecting portion (43) is arranged in the slot (302).

6. The impeller assembly according to any one of claims 1 to 5, characterized in that: The fan blade (20) is plugged into the second end cover (30), and / or the fan blade (20) is plugged into the first end cover (10); The fan blade (20) comprises a blade base plate (23); the blade (22) comprises a first blade portion (221) connected to the connection structure (21), and also comprises a second blade portion (222) connected to an end of the first blade portion (221) facing away from the connection structure (21); the second blade portion (222) is located between the blade base plate (23) and the second end cover (30), and the second blade portion (222) is connected to the blade base plate (23).

7. A centrifugal fan, characterized in that: An impeller assembly (100) according to any one of claims 1 to 6, further comprising a power device (300) and a volute (200); The volute (200) has an inner cavity, and the impeller assembly (100) is arranged in the inner cavity; the power device (300) is connected to the impeller assembly (100) to drive the impeller assembly (100) to rotate.

8. The centrifugal fan according to claim 7, characterized in that: A pre-pressure convex portion (61) is provided on a side of the volute (200) close to the power device (300), and the pre-pressure convex portion (61) abuts against the power device (300); And / or, a pre-pressure convex portion (61) is provided on a side of the power device (300) close to the volute (200), and the pre-pressure convex portion (61) abuts against the volute (200).

9. The centrifugal fan according to claim 8, characterized in that: The volute (200) comprises a first shell (51) and a second shell (52) connected to each other, and the impeller assembly (100) is arranged between the first shell (51) and the second shell (52); The power device (300) is arranged on a side of the second housing (52) away from the second end cover (30); the power device (300) comprises a motor (70), the motor (70) has an output shaft (71), and the output shaft (71) is connected to the second end cover (30); A plurality of pre-pressure convex portions (61) are provided between the second housing (52) and the power device (300), and the plurality of pre-pressure convex portions (61) are distributed on the periphery of the output shaft (71); The power device (300) further comprises a bushing (90), wherein the bushing (90) is sleeved on the output shaft (71); the second housing (52) is provided with a pre-pressing protrusion (61), and the bushing (90) abuts against the pre-pressing protrusion (61); and / or the bushing (90) is provided with a pre-pressing protrusion, and the pre-pressing protrusion abuts against the second housing (52); The power device (300) further comprises a mounting plate (80), the motor (70) is connected to the mounting plate (80), and the mounting plate (80) is connected to the second housing (52) via a fastener; An annular protrusion (62) is provided on a side of the second shell (52) facing away from the first shell (51); The second end cover (30) is provided with a first axial hole (301), the second shell (52) is provided with a shell hole (521), and the output shaft (71) is passed through the shell hole (521) and the first axial hole (301); the annular protrusion (62) is located at the periphery of the shell hole (521), and an assembly step is defined between the annular protrusion (62) and the second shell (52), and the bushing (90) is inserted into the assembly step.

10. An automatic cleaning device, characterized in that: Comprising the centrifugal fan as described in any one of claims 7 to 9.

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