Volute fan for sweeper

Abstract

A volute fan used on a sweeper comprises a volute, an impeller, a rotor assembly, a stator assembly and a circuit board, the impeller is arranged in an inner cavity of the volute, the stator assembly and the circuit board are connected to the volute, an iron core winding of the stator assembly is connected with the circuit board through a wire, the rotor assembly comprises a rotating shaft, a magnetic ring, a flux sleeve and a limiting piece, and the magnetic ring is arranged on the rotating shaft. The rotating shaft is arranged on a bearing body of the stator assembly in a penetrating mode, the limiting piece is connected with the rotating shaft and the bearing piece, one end of the rotating shaft penetrates through the volute to be connected with the impeller, the other end of the rotating shaft is connected with the magnetic conductive sleeve, the magnetic ring is fixed in the magnetic conductive sleeve, and the stator assembly is sleeved with the magnetic conductive sleeve. The magnetic ring corresponds to an iron core winding of the stator assembly, and the number of blades of the impeller is larger than 9. The device has the advantages that the vacuum degree of the turbine fan can be increased to 30-35 Kpa and is higher than that of a fan in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of volute fan for sweeper, and especially to a kind of volute fan for sweeper. BACKGROUND

[0002] The maximum vacuum degree of existing sweeper fan is 4~20Kpa, with the increasing demand of customers for stubborn stain cleaning, current suction cannot meet customer demand, and shaft loosening and bearing follow rotation easily occur in high-speed rotation process, resulting in unstable operation and large noise during motor operation; With the increase of vacuum degree, the centrifugal force is large during motor rotation, resulting in the phenomenon of fragmentation and burst of magnetic ring, which seriously affects the stability of product and exists certain safety hazard. Therefore, the structure of sweeper fan still needs to be further improved. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a volute fan for sweeper with strong suction and vacuum degree of fan reaching more than 30Kpa in view of the above-mentioned prior art status.

[0004] The technical scheme adopted by the present application to solve the above technical problem is: the volute fan for sweeper, comprising a volute, an impeller, a rotor assembly, a stator assembly and a circuit board, the impeller is arranged in the inner cavity of the volute, the stator assembly and the circuit board are connected to the volute, the iron core winding of the stator assembly is connected to the circuit board through a wire, characterized in that: the rotor assembly comprises a shaft, a magnetic ring, a magnetic guide sleeve and a limiting piece, the shaft is arranged on the bearing body of the stator assembly, the limiting piece connects the shaft and the bearing piece, one end of the shaft passes through the volute and is connected to the impeller, the other end of the shaft is connected to the magnetic guide sleeve, the magnetic ring is fixed in the magnetic guide sleeve, the magnetic guide sleeve is sleeved on the stator assembly, the magnetic ring corresponds to the iron core winding of the stator assembly, and the number of blades of the impeller is greater than 9.

[0005] As an improvement, the magnetic guide sleeve can be connected together with the magnetic ring by interference fit, and the inner diameter of the magnetic guide sleeve is 0.05~0.1mm smaller than the outer diameter of the magnetic ring. The magnetic ring is subjected to a certain inward extrusion force in the initial stage, and the inward extrusion force applied to the magnetic ring by the magnetic guide sleeve offsets part of the centrifugal force generated by the high-speed operation of the magnetic ring, so that the actual stress value of the magnetic ring during operation is reduced, the damage to the magnetic ring is greatly reduced, and the stable operation of the magnetic ring is ensured, avoiding motor failure.

[0006] Further improvement, the magnetic guide sleeve can preferably comprise a magnetic guide and a balance ring, the magnetic guide is connected to the shaft, the magnetic guide is sleeved on the stator assembly, the magnetic ring is connected in the magnetic guide, and the balance ring is sleeved on the magnetic guide. The magnetic guide sleeve rotates more balanced, and has longer service life.

[0007] Further improvement, the magnetic conductor and the bearing body can be preferably sandwiched with wear-resistant sheet.

[0008] As an improvement, the stator assembly can preferably include a bearing seat, a core winding, an upper bearing, an elastic gasket and a lower bearing, the upper bearing and the lower bearing are arranged in the bearing seat, the elastic gasket is arranged between the bottom of the upper bearing and the bottom surface of the upper bearing mounting cavity of the bearing seat, the bearing seat is connected with the volute, the core winding is sleeved on the bearing seat, and the rotating shaft passes through the upper bearing and the lower bearing in sequence. Compact structure.

[0009] Further improvement, a gap can be preferably left between the rotating shaft and the inner ring of the upper bearing, and a gap can be preferably left between the rotating shaft and the inner ring of the lower bearing. The gap between the outer diameter of the rotating shaft and the bearing inner ring naturally forms a contract type structure. When the rotating shaft rotates at high speed, the rotating shaft and the bearing inner ring form a state similar to a pneumatic suspension bearing due to the contract type gap, which greatly improves the running stability of the motor, completely avoids the problem of adhesive fit and interference fit, prolongs the service life of the bearing and reduces the rotating noise of the rotating shaft. At the same time, the configuration of the pneumatic suspension state bearing reduces the friction of the bearing and can improve the efficiency of the entire running system.

[0010] Further improvement, a clamping groove can be preferably arranged on the outer wall of the rotating shaft corresponding to the upper bearing, the limiting piece can be preferably a limiting snap spring clamped in the clamping groove, and the limiting snap spring abuts against the inner ring of the upper bearing. Simple structure and good limiting effect.

[0011] As an improvement, a connecting plate body can be preferably arranged on the volute, the connecting plate body is connected with the stator assembly, an insulating gasket is arranged on the connecting plate body, and the circuit board is connected on the insulating gasket. The structure is more compact, and the size of the fan is reduced.

[0012] As an improvement, the volute can preferably include an upper shell and a lower shell, and the upper shell and the lower shell are connected through the buckle piece on the outer wall of the volute. It is convenient to disassemble and install the fan.

[0013] As an improvement, a limiting groove can be preferably arranged at the air inlet of the volute, and the top of the impeller is provided with an impeller protruding ring capable of extending into the limiting groove. The gap between the impeller and the volute is reduced, the sealing performance of the air suction cavity is higher, the air guiding efficiency is higher, and it is more conducive to improving the vacuum degree of the fan.

[0014] Compared with the prior art, the advantages of the present application are that the end of the rotating shaft is connected with the magnetic guide sleeve, the magnetic ring is fixed in the magnetic guide sleeve, the magnetic guide sleeve is sleeved on the stator assembly, the magnetic ring corresponds to the core winding of the stator assembly, the magnetic guide sleeve is sleeved outside the stator assembly, the magnetic guide sleeve has a larger centrifugal force on the rotating shaft, the rotating speed of the rotating shaft is improved more efficiently, the rotating speed of the rotating shaft is improved, the impeller is rotated faster, and the vacuum degree of the fan is improved; the number of blades of the impeller is greater than 9, the control of the impeller on the fluid is more stable, and the fluid efficiency is higher; in general, the structure can improve the vacuum degree of the turbine fan to 30-35 Kpa, which is higher than the vacuum degree of the fan in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of an embodiment of the present application;

[0016] Figure 2 is a side projection view of Figure 1 ;

[0017] Figure 3 is a sectional view along line A-A in Figure 2 ;

[0018] Figure 4 is a sectional view along line B-B in Figure 2 ;

[0019] Figure 5 is a bottom view of Figure 1 ;

[0020] Figure 6 is a sectional view along line C-C in Figure 5 ;

[0021] Figure 7 is a sectional view along the central axis of the rotor assembly in Figure 1 , showing the stress state of the magnetic ring in a static state;

[0022] Figure 8 is a sectional view of the rotor assembly in Figure 7 , showing the stress state of the magnetic ring after rotation;

[0023] Figure 9 is an exploded view of Figure 1 ;

[0024] Figure 10 is a further exploded view of Figure 9 ;

[0025] Figure 11 is a perspective view from another angle; Figure 1

[0026] Figure 12 is an exploded view of Figure 11 ;​

[0027] Figure 13 is Figure 10 structure exploded view of the rotor assembly and the impeller in the middle;

[0028] Figure 14 is Figure 12 structure exploded view of the stator assembly and the circuit board connecting structure in the middle;

[0029] Figure 15 is Figure 6 enlarged view of the I part in the middle;

[0030] Figure 16 is Figure 6 enlarged view of the II part in the middle;

[0031] Figure 17 is Figure 16 structure schematic view showing the cooperation relationship between the rotating shaft and the inner ring of the bearing in the middle;

[0032] Figure 18 is Figure 6 enlarged view of the III part in the middle. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the drawings.

[0034] As shown in Figures 1 to 18 , the volute fan for the sweeper in the embodiment comprises a volute 1, an impeller 2, a rotor assembly, a stator assembly, a circuit board 3, the impeller 2 is arranged in the inner cavity of the volute 1, the stator assembly and the circuit board 3 are connected on the volute 1, the iron core winding 51 of the stator assembly is connected with the circuit board 3 through wires. The specific circuit structure adopted by the circuit board 3 and the specific principle that the circuit board 3 controls the stator assembly to drive the rotor assembly to rotate belong to the known technology, so they will not be described in detail.

[0035] The rotor assembly comprises a rotating shaft 4, a magnetic ring 41, a magnetic conducting sleeve and a limiting piece 44, the rotating shaft 4 is arranged on the bearing body of the stator assembly, the limiting piece connects the rotating shaft 4 and the bearing body, one end of the rotating shaft 4 penetrates through the volute 1 and is connected with the impeller 2, the other end of the rotating shaft 4 is connected with the magnetic conducting sleeve, the magnetic ring 41 is fixed in the magnetic conducting sleeve, the magnetic conducting sleeve is sleeved on the stator assembly, the magnetic ring 41 corresponds to the iron core winding 51 of the stator assembly, and the number of the blades 21 of the impeller 2 is greater than 9. The magnetic conducting sleeve and the magnetic ring 41 are connected together in interference fit, the inner diameter of the magnetic conducting sleeve is 0.05-0.1 mm smaller than the outer diameter of the magnetic ring 41. The magnetic conducting sleeve comprises a magnetic conductor 42 and a balance ring 43, the magnetic conductor 42 is connected on the rotating shaft 4, the magnetic conductor 42 is sleeved on the stator assembly, the magnetic ring 41 is connected in the magnetic conductor 42, and the balance ring 43 is sleeved on the magnetic conductor 42. The wear-resistant sheet 45 is clamped between the magnetic conductor 42 and the bearing body.

[0036] The stator assembly comprises a bearing seat 5, a core winding 51, an upper bearing 52, an elastic gasket 53 and a lower bearing 54, the upper bearing 52 and the lower bearing 54 are arranged in the bearing seat 5, the elastic gasket 53 is arranged between the bottom of the upper bearing 52 and the bottom surface of the upper bearing mounting cavity of the bearing seat 5, and damping grease is applied between the upper bearing 52 and the upper bearing mounting cavity. The bearing seat 5 is connected with the volute 1, the core winding 51 is sleeved on the bearing seat 5, and the rotating shaft 4 passes through the upper bearing 52 and the lower bearing 54 in sequence. There is a gap 50 between the rotating shaft 4 and the inner ring of the upper bearing 52, and there is a gap 50 between the rotating shaft 4 and the inner ring of the lower bearing 54. The outer wall of the rotating shaft 4 corresponding to the upper bearing 52 is provided with a clamping groove 40, the limiting piece 44 is a limiting circlip clamped in the clamping groove 40, and the limiting circlip abuts against the inner ring of the upper bearing 52.

[0037] The volute 1 is provided with a connecting plate body 11, the connecting plate body 11 is connected with the stator assembly, the connecting plate body 11 is provided with an insulating gasket 12, and the circuit board 3 is connected to the insulating gasket 12.

[0038] The stator assembly is assembled as follows: the bearing seat 5 is made of copper sleeve, and the circuit board 3 is in interference fit with the copper sleeve. The insulating gasket 12 and the circuit board 3 are provided with through holes corresponding to each other, the circuit board 3, the insulating gasket 12 and the connecting plate body 11 are riveted to fix the circuit board 3, and the copper sleeve passes through the middle through hole of the fixed structure of the circuit board 3, the insulating gasket 12 and the connecting plate body 11. The lower bearing 54 is arranged in the copper sleeve, the outer ring of the bearing is in adhesive fit with the mounting cavity of the copper sleeve, the elastic gasket 53, i.e. the wave spring, is arranged, the upper bearing 52 is pressed in, damping grease is applied between the upper bearing 52 and the upper bearing mounting cavity, and then the stator core with the wound wire, i.e. the core winding 51, is pressed in. The stator core is in interference fit with the bearing seat 5. Thus, the installation of the stator assembly is completed.

[0039] The volute 1 comprises an upper shell 10 and a lower shell, and the upper shell 10 and the lower shell are connected through the buckle piece on the outer wall of the volute. The limiting groove 13 is arranged at the air inlet 101 of the volute 1, and the top of the impeller 2 is provided with the impeller protruding ring 22 capable of extending into the limiting groove 13. The air outlet 102 of the volute 1 is located on the side wall of the volute 1.

[0040] The assembly of the rotor assembly is as follows: the magnetically permeable body 42 is in interference fit with the balance ring 43, then the rotating shaft 4 is in interference fit with the magnetically permeable body 42, the magnetic ring 41 is in interference fit with the magnetically permeable ring, i.e. the magnetically permeable body 42, then the wear-resistant sheet 45 is arranged on the rotating shaft to form the rotor assembly.

[0041] The rotor assembly and the stator assembly are combined, the rotating shaft 4 passes through the inner rings of the upper and lower bearings, the axial movement of the rotor assembly is fixed by clamping the limiting circlip into the clamping groove 40, and the limiting circlip is fixed in the clamping groove 40 in the inner ring of the upper bearing and the rotating shaft 4.

[0042] The motor body is now complete. The motor body is fixed to the bottom of the lower housing of the volute 1 by the three screw holes on circuit board 3 engaging with the three screw holes on the volute base. The shaft 4 passes through the hole in the center of the bottom of the volute and presses in the impeller 2. The impeller 2 and shaft 4 are interference-fitted. Then, the upper housing 10 of the volute 1 is installed. The upper housing 10 uses four snap-fit ​​pieces to engage with four protruding structures on the lower housing, thus securing and fitting the volute 1. The specific structure of the snap-fit ​​pieces and the specific principle of the engagement between the snap-fit ​​pieces and the protruding structures are known technologies and will not be described in detail. The motor assembly is now complete.

[0043] Working principle: The magnetic sleeve is fitted onto the stator assembly, and the magnetic ring corresponds to the iron core winding of the stator assembly. Since the magnetic sleeve is outside the stator assembly, it exerts a greater centrifugal force on the shaft, resulting in a higher shaft speed and efficiency improvement. This helps to increase the shaft speed, thereby accelerating the impeller rotation and improving the fan vacuum. The impeller has more than nine blades, resulting in more stable fluid control and higher fluid efficiency. Overall, this structure can increase the vacuum of the turbine fan to 30–35 kPa.

[0044] Traditional solutions employ either adhesive bonding between the shaft and the bearing inner ring or an interference fit between the shaft and the bearing inner ring. However, both of these methods have problems when operating at high speeds and high vacuum levels.

[0045] Adhesive bonding: When the motor is running at high speed, the high temperature generated by the bearing causes the adhesive between the shaft and the inner wall of the bearing to fail due to the high temperature. The failed adhesive will cause the bearing to fail and the product to become noisier when the motor is running at high speed, which will eventually lead to product failure.

[0046] Interference fit: In the assembly of shafts and bearings, it is difficult to control the interference amount when using an interference fit. Excessive interference force often occurs during assembly, causing the inner ring of the support to expand outwards, leading to bearing damage. Insufficient interference amount results in an unreliable connection, causing the shaft to wobble within the bearing, generating noise and vibration, and ultimately leading to product failure.

[0047] This patented solution employs a clearance fit between the shaft and the bearing inner ring. The shaft machining accuracy is controlled within 2.993±0.001 mm, and the bearing inner ring accuracy is 4 to 2.995 mm, ensuring that the two are in a clearance fit. Under this clearance fit, the outer diameter of the shaft and the inner ring of the bearing naturally form a wedge-shaped structure. Figure 17 The dashed line divides the 50mm gap into an upper and lower section, with the lower section being wedge-shaped. The shaft rotates at high speed driven by the motor. During operation, the wedge-shaped gap between the shaft and the inner ring of the bearing creates a state similar to a pneumatic suspension bearing, significantly improving the motor's operational stability and completely avoiding issues related to adhesive fits and interference fits. Simultaneously, the pneumatic suspension bearing configuration reduces bearing friction, improving the efficiency of the entire operating system.

[0048] The traditional scheme is that the magnetic ring and the magnetic conductive ring, i.e. the magnetic conductive body, are matched by using adhesive, however, the adhesive matching makes a certain gap exist between the magnetic ring and the magnetic conductive ring, in the process of high-speed running of the motor (≥80000 rpm), the magnetic ring and the magnetic conductive ring are subjected to a huge centrifugal force F2, since the gap exists between the magnetic ring and the magnetic conductive ring, and the strength of the magnetic ring is not as high as that of the magnetic conductive ring (metal part), the magnetic ring is broken and burst in the running process, resulting in failure of the motor.

[0049] The technical scheme is that the interference matching between the magnetic ring and the magnetic conductive ring is controlled in 0.05-0.1 mm, so that the magnetic ring is subjected to a certain inward extrusion force F1 in the initial stage, as shown in the figure, the inward extrusion force of the magnetic conductive ring to the magnetic ring offsets part of the centrifugal force F2 generated by the magnetic ring in the high-speed running, as shown in the figure, so that the actual force value of the magnetic ring in the running process is the difference between F2 and F1, the damage to the magnetic ring is greatly reduced, and then the stable work of the magnetic ring is ensured, and the failure of the motor is avoided. Figure 7 Figure 8 The technical scheme is that the interference matching between the magnetic ring and the magnetic conductive ring is controlled in 0.05-0.1 mm, so that the magnetic ring is subjected to a certain inward extrusion force F1 in the initial stage, as shown in the figure, the inward extrusion force of the magnetic conductive ring to the magnetic ring offsets part of the centrifugal force F2 generated by the magnetic ring in the high-speed running, as shown in the figure, so that the actual force value of the magnetic ring in the running process is the difference between F2 and F1, the damage to the magnetic ring is greatly reduced, and then the stable work of the magnetic ring is ensured, and the failure of the motor is avoided.​

Claims

1. A scroll fan for use on a floor cleaning machine, comprising a scroll (1), an impeller (2), a rotor assembly, a stator assembly, a circuit board (3), the impeller (2) being disposed in an internal cavity of the scroll (1), the stator assembly and the circuit board (3) being attached to the scroll (1), the core winding (51) of the stator assembly being connected to the circuit board (3) by a wire, characterized in that: The rotor assembly comprises a rotating shaft (4), a magnetic ring (41), a magnetic conducting sleeve, and a limiting member (44), the rotating shaft (4) is arranged on the bearing body of the stator assembly, the limiting member connects the rotating shaft (4) and the bearing body, one end of the rotating shaft (4) penetrates the volute (1) and is connected with the impeller (2), the other end of the rotating shaft (4) is connected with the magnetic conducting sleeve, the magnetic ring (41) is fixed in the magnetic conducting sleeve, the magnetic conducting sleeve is sleeved on the stator assembly, the magnetic ring (41) corresponds to the core winding (51) of the stator assembly, and the number of blades (21) of the impeller (2) is greater than 9.

2. The volute fan of claim 1, wherein: The magnetic conducting sleeve and the magnetic ring (41) are connected together in interference fit, and the inner diameter of the magnetic conducting sleeve is 0.05-0.1 mm smaller than the outer diameter of the magnetic ring (41).

3. The volute fan of claim 2, wherein: The magnetic conducting sleeve comprises a magnetic conductor (42) and a balance ring (43), the magnetic conductor (42) is connected to the rotating shaft (4), the magnetic conductor (42) is sleeved on the stator assembly, the magnetic ring (41) is connected in the magnetic conductor (42), and the balance ring (43) is sleeved on the magnetic conductor (42).

4. The volute fan of claim 3, wherein: The wear-resistant sheet (45) is clamped between the magnetic conductor (42) and the bearing body.

5. The volute fan according to any one of claims 1 to 4, characterized in that: The stator assembly comprises a bearing seat (5), a core winding (51), an upper bearing (52), an elastic gasket (53), and a lower bearing (54), the upper bearing (52) and the lower bearing (54) are arranged in the bearing seat (5), the elastic gasket (53) is arranged between the bottom of the upper bearing (52) and the bottom surface of the upper bearing mounting cavity of the bearing seat (5), the bearing seat (5) is connected with the volute (1), the core winding (51) is sleeved on the bearing seat (5), and the rotating shaft (4) sequentially penetrates the upper bearing (52) and the lower bearing (54).

6. The volute fan of claim 5, wherein: Gaps (50) are left between the rotating shaft (4) and the inner rings of the upper bearing (52) and the lower bearing (54).

7. The volute fan of claim 5, wherein: A clamping groove (40) is arranged on the outer wall of the rotating shaft (4) corresponding to the upper bearing (52), the limiting member (44) is a limiting circlip clamped in the clamping groove (40), and the limiting circlip abuts against the inner ring of the upper bearing (52).

8. The volute fan according to any one of claims 1 to 4, characterized in that: The volute (1) is provided with a connecting plate body (11), the connecting plate body (11) is connected with the stator assembly, the connecting plate body (11) is provided with an insulating gasket (12), and the circuit board (3) is connected to the insulating gasket (12).

9. The volute fan according to any one of claims 1 to 4, characterized in that: The volute (1) comprises an upper shell (10) and a lower shell, and the upper shell (10) and the lower shell are connected through the buckle member on the outer wall of the volute.

10. The volute fan according to any one of claims 1 to 4, characterized in that: A limiting groove (13) is arranged at the air inlet (101) of the volute (1), and the top of the impeller (2) is provided with an impeller protruding ring (22) capable of extending into the limiting groove (13).

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