Centrifugal fan, fan assembly and motor sweeper
By setting a water retaining ring and a labyrinth seal structure in the centrifugal fan, the problem of sewage entering the motor in the sweeper is solved, the motor is protected, failures are avoided and the service life is extended.
Patent Information
- Application Number
- CN202422374401.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During operation, the centrifugal fan of the sweeper often sucks in sewage, causing transmission failure and even motor failure.
A centrifugal fan is designed. A first and a second water retaining ring are arranged between the impeller and the fan end cover to form a multi-layer waterproof layer. Combined with a labyrinth seal and a water guide channel, sewage is prevented from entering the motor bearings and the motor is protected.
Effectively prevent sewage from entering the motor bearings, avoid motor failure, extend the motor service life, and ensure the normal operation of the sweeper.
Smart Images
Figure CN223318079U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of sweepers, and in particular to a centrifugal fan, a fan assembly, and a sweeper. Background Art
[0002] Sweepers are a primary tool for cleaning urban roads. They operate by utilizing a power source such as an engine or motor to drive a centrifugal fan, creating negative pressure that collects ground debris through a suction nozzle and straw into a trash bin, thereby cleaning the road. As one of the primary components of a street sweeper, the centrifugal fan plays a vital role in its operation, making its proper operation crucial. However, current street sweepers often inhale wastewater during operation, causing the fan's transmission to malfunction and, in severe cases, even rendering the motor connected to the fan useless. Utility Model Content
[0003] The purpose of the present disclosure is to provide a centrifugal fan, a fan assembly and a sweeper, wherein the centrifugal fan can prevent sewage from entering the motor shaft during operation, thereby protecting the motor connected to the centrifugal fan.
[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a centrifugal fan, which includes: an impeller, on which an assembly hole and a first water retaining ring are provided, the assembly hole is used to cooperate with the motor shaft, and the first water retaining ring is arranged around the assembly hole; and a fan end cover, on which a second water retaining ring and a first mounting hole that passes through the fan end cover along its own axial direction are provided, the first mounting hole is opposite to the assembly hole and is used for the motor shaft to pass through, and the second water retaining ring is arranged around the first mounting hole and extends along its own axial direction to at least partially overlap with the first water retaining ring.
[0005] Optionally, the fan end cover has a first side surface arranged toward the impeller and a second side surface arranged away from the impeller, the second water retaining ring is arranged on the first side surface and extends in a direction away from the first side surface, and the second side surface is used to connect to the motor end cover.
[0006] Optionally, the first water retaining ring has thickness in its radial direction and extends in a direction away from the impeller, a first mounting groove is formed on the end face of the first water retaining ring, and at least part of the second water retaining ring is inserted into the first mounting groove along its axial direction.
[0007] Optionally, the second water retaining ring is provided with drainage holes, the drainage holes radially penetrate the second water retaining ring, and at least part of the drainage holes is located outside the overlapping area of the first water retaining ring and the second water retaining ring.
[0008] Optionally, the second side surface has a recessed portion and at least two protruding water guide blocks, at least two of the water guide blocks are spaced apart around the recessed portion, the water guide blocks are used to install the motor end cover and make part of the motor end cover located in the recessed portion, and two adjacent water guide blocks are used to form a water guide channel together with the motor end cover and the second side surface.
[0009] Optionally, the impeller includes a rear disc, the rear disc includes a rear disc body and a hub, the hub is arranged at the center of the rear disc body and extends along its own axial direction toward both sides of the rear disc body, the assembly hole is axially opened on the hub, the first water retaining ring is arranged on the rear disc body, and a pulling groove is provided on the outer periphery of the hub, and the pulling groove is located on the side of the rear disc body away from the fan end cover.
[0010] On the basis of the above technical solution, the present disclosure further provides a fan assembly, including a motor and the above-mentioned centrifugal fan, the centrifugal fan including an impeller, a fan housing and a fan end cover, the fan end cover being arranged at one end of the fan housing, the impeller being installed in the fan housing, the motor including a motor housing, a motor end cover and a motor shaft, the motor end cover being arranged at one end of the motor housing, the motor shaft being rotatably arranged in the motor housing, one end of the motor shaft passing through the motor end cover and the fan end cover and being matched with the assembly hole of the impeller.
[0011] Optionally, a plurality of second mounting grooves are formed on the motor end cover, and the plurality of second mounting grooves are arranged at radial intervals along the motor end cover. The fan assembly also includes a labyrinth seal, and the labyrinth seal includes a sealing end cover and a plurality of annular sealing teeth arranged on one side of the sealing end cover. The sealing end cover is arranged in the first mounting hole, and the plurality of annular sealing teeth are arranged one-to-one in the plurality of second mounting grooves. A second mounting hole is opened in the center of the sealing end cover, and the sealing end cover is sleeved on the motor shaft through the second mounting hole and rotates synchronously with the motor shaft.
[0012] Optionally, a drainage groove is radially provided on the motor end cover, and the drainage groove is located on a side of the motor end cover close to the fan end cover.
[0013] On the basis of the above technical solution, the present disclosure further provides a sweeper, comprising the above-mentioned blower assembly.
[0014] Through the above technical solution, when the centrifugal fan provided by the present invention is in use, the fan end cover can be installed in a suitable position so that the second water retaining ring can be extended along its own axial direction to at least partially overlap with the first water retaining ring on the impeller. In this way, the motor shaft arranged between the impeller and the fan end cover can be protected in the radial direction to prevent the impeller from bringing splashed sewage into the motor shaft during rotation, thereby preventing the sewage from entering the motor bearing through the motor shaft, causing the motor bearing to rust. Since the motor bearing is a key component for the operation of the motor, if the motor bearing is damaged, the normal operation of the motor will be affected, and in severe cases, the motor will be scrapped. Therefore, the present invention can provide waterproof protection for the motor shaft arranged between the impeller and the fan end cover in the radial direction by extending the second water retaining ring along its own axial direction to at least partially overlap with the first water retaining ring, thereby providing waterproof protection for the motor bearing, thereby preventing sewage from entering the motor bearing through the motor shaft and causing the motor to be scrapped.
[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0017] Figure 1 is a schematic cross-sectional structural diagram of a fan assembly provided by an exemplary embodiment of the present disclosure;
[0018] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;
[0019] Figure 3 is a schematic diagram of an exploded structure of a fan assembly provided by an exemplary embodiment of the present disclosure;
[0020] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;
[0021] Figure 5 is a schematic diagram of an exploded structure of a motor in a fan assembly provided by an exemplary embodiment of the present disclosure;
[0022] Figure 6 is a schematic structural diagram of a fan end cover provided by an exemplary embodiment of the present disclosure;
[0023] Figure 7 is another structural schematic diagram of a fan end cover provided by an exemplary embodiment of the present disclosure;
[0024] Figure 8is a schematic structural diagram of an impeller provided by an exemplary embodiment of the present disclosure;
[0025] Figure 9 is a schematic structural diagram of a motor end cover provided by an exemplary embodiment of the present disclosure;
[0026] Figure 10 Schematic diagram of the structure of a labyrinth seal provided by an exemplary embodiment of the present disclosure.
[0027] Description of Reference Numerals
[0028] 1-motor; 11-motor housing; 12-motor end cover; 121-second mounting slot; 122-drainage slot; 13-motor shaft; 2-centrifugal fan; 21-impeller; 211-rear disc; 2111-rear disc body; 2111a-first water retaining ring; 2111b-first mounting slot; 2112-wheel hub; 2112a-assembly hole; 2112b-pulling groove; 22-fan end cover; 221-first side; 2211-second water retaining ring; 2211a-drainage hole; 222-second side; 2221-recessed portion; 2222-water guide block; 223-first mounting hole; 23-fan housing; 3-water guide channel; 4-labyrinth seal; 41-sealing end cover; 411-second mounting hole; 42-annular sealing teeth; 5-felt seal. DETAILED DESCRIPTION
[0029] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.
[0030] In this disclosure, unless otherwise specified, directional terms such as "inside" and "outside" refer to the "inside" and "outside" relative to the outline of the corresponding component itself. In addition, the terms "first" and "second" used in this disclosure are intended to distinguish one element from another and do not have sequential or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate this disclosure and should not be understood as limiting this disclosure.
[0031] The present disclosure provides a centrifugal fan 2, referring to Figures 1 to 9As shown in, the centrifugal fan 2 includes: an impeller 21, an assembly hole 2112a and a first water retaining ring 2111a are provided on the impeller 21, the assembly hole 2112a is used to cooperate with the motor shaft 13, and the first water retaining ring 2111a is arranged around the assembly hole 2112a; and a fan end cover 22, the fan end cover 22 is provided with a second water retaining ring 2211 and a first mounting hole 223 that passes through along its own axial direction, the first mounting hole 223 is opposite to the assembly hole 2112a and is used to allow the motor shaft 13 to pass through, the second water retaining ring 2211 is arranged around the first mounting hole 223 and extends along its own axial direction to at least partially overlap with the first water retaining ring 2111a.
[0032] Through the above technical solution, when the centrifugal fan 2 provided by the present invention is in use, the fan end cover 22 can be installed in a suitable position so that the second water retaining ring 2211 can extend along its own axial direction to at least partially overlap with the first water retaining ring 2111a on the impeller 21. In this way, the motor shaft 13 arranged between the impeller 21 and the fan end cover 22 can be protected in the radial direction to prevent the impeller 21 from bringing splashed sewage into the motor shaft 13 during rotation, thereby causing the sewage to enter the motor bearing through the motor shaft 13 and cause the motor bearing to rust. Since the motor bearing is a key component for the operation of the motor 1, if the motor bearing is damaged, the normal operation of the motor 1 will be affected, and in severe cases, the motor 1 will be scrapped. Therefore, the present invention provides waterproof protection for the motor shaft 13 arranged between the impeller 21 and the fan end cover 22 in the radial direction by extending the second water retaining ring 2211 along the axial direction of the second water retaining ring 2211 to at least partially overlap with the first water retaining ring 2111a, thereby providing waterproof protection for the motor bearings and preventing sewage from entering the motor bearings through the motor shaft 13 and causing the motor 1 to be scrapped.
[0033] In the exemplary embodiments provided in the present disclosure, reference is made to Figure 1 、 Figure 2 、 Figure 6 as well as Figure 7 As shown in the figure, the fan end cover 22 can have a first side surface 221 arranged toward the impeller 21 and a second side surface 222 arranged away from the impeller 21, the second water retaining ring 2211 is arranged on the first side surface 221 and extends in a direction away from the first side surface 221, and the second side surface 222 is used to connect with the motor end cover 12. Through such an arrangement, the connection between the fan end cover 22 and the motor end cover 12 and the matching installation between the second water retaining ring 2211 and the first water retaining ring 2111a can be taken into account at the same time.
[0034] In the exemplary embodiments provided in the present disclosure, reference is made to Figure 2 、 Figure 4 as well as Figure 8As shown in the figure, the first water retaining ring 2111a has a thickness in its own radial direction and extends in the direction away from the impeller 21, and a first mounting groove 2111b is formed on the end face of the water retaining ring 2111a, and at least part of the second water retaining ring 2211 is inserted into the first mounting groove 2111b along its own axial direction. In this way, the water flow path formed between the first water retaining ring 2111a and the second water retaining ring 2211 can be made more tortuous so as to extend the water flow path. Therefore, the difficulty of sewage entering the motor shaft 13 located inside the first water retaining ring 2111a and the second water retaining ring 2211 from the radial direction can be further increased, thereby better protecting the motor shaft 13.
[0035] Among them, without considering the cost, in order to better provide waterproof protection for the motor shaft 13 arranged between the impeller 21 and the fan end cover 22 in the radial direction, a plurality of first mounting grooves 2111b can be arranged radially on the end face of the first water retaining ring 2111a, and a plurality of second water retaining rings 2211 can be arranged radially at intervals on the fan end cover 22. The plurality of second water retaining rings 2211 are inserted into the plurality of first mounting grooves 2111b one by one. In this way, the plurality of first mounting grooves 2111b of the first water retaining ring 2111a and the plurality of second water retaining rings 2211 can form a multi-layer waterproof layer in the radial direction, thereby more reliably preventing the entry of sewage in the radial direction.
[0036] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 and Figure 6 As shown in the figure, the second water retaining ring 2211 can be provided with drainage holes 2211a, and the drainage holes 2211a radially penetrate the second water retaining ring 2211, and at least part of the drainage holes 2211a is located outside the overlapping area of the first water retaining ring 2111a and the second water retaining ring 2211. In this way, even if the sewage passes through the first layer of seal set by the first water retaining ring 2111a and the second water retaining ring 2211 and enters the motor shaft 13, due to the setting of the drainage holes 2211a, the entering sewage can also flow out through these drainage holes 2211a in time, thereby further preventing the sewage from entering the motor bearings through the motor shaft 13 and causing corrosion of the motor bearings.
[0037] In order to facilitate the discharge of sewage, a drainage hole 2211 a may be provided at the bottom of the second water retaining ring 2211 .
[0038] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 and Figure 7As shown in the figure, the second side surface 222 has a recessed portion 2221 and at least two water guide blocks 2222 that are protruding. At least two water guide blocks 2222 are arranged at intervals around the recessed portion 2221. The water guide blocks 2222 are used to install the motor end cover 12 and make part of the motor end cover 12 located in the recessed portion 2221. The two adjacent water guide blocks 2222 are used to form a water guide channel 3 together with the motor end cover 12 and the second side surface 222. Through such an arrangement, even if the first layer of waterproofing (i.e., the first water retaining ring 2111a on the impeller 21 and the fan end cover 2 2) is not well done, so that the sewage radially enters the motor shaft 13 arranged between the fan end cover 22 and the impeller 21, and enters between the fan end cover 22 and the motor end cover 12 through the first mounting hole 223 on the fan end cover 22 when the motor 1 is running. However, due to the provision of the above-mentioned water guide channel 3, this part of the sewage can flow out through the water guide channel 3, thereby preventing the sewage from accumulating between the fan end cover 22 and the motor end cover 12 and affecting the motor shaft 13 or even the motor bearings.
[0039] Exemplarily, four water guide blocks 2222 may be provided, and the four water guide blocks 2222 are arranged at intervals around the recessed portion 2221 . In order to further facilitate the smooth discharge of sewage, at least one water guide channel 3 may be provided at the bottom of the fan end cover 22 .
[0040] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 、 Figure 4 as well as Figure 8 As shown in , the impeller 21 may include a rear disc 211, which may include a rear disc body 2111 and a hub 2112. The hub 2112 is located at the center of the rear disc body 2111 and extends axially toward both sides of the rear disc body 2111. An assembly hole 2112a is axially formed in the hub 2112. A first water retaining ring 2111a is provided on the rear disc body 2111. A puller groove 2112b may be provided on the outer periphery of the hub 2112. The puller groove 2112b is located on a side of the rear disc body 2111 away from the fan end cover 22. This arrangement facilitates the removal of the motor shaft 13 from the impeller 21. Specifically, when the motor shaft 13 and the impeller 21 need to be removed, the puller's hook can be securely clamped in the puller groove 2112b, and then the motor shaft 13 and the impeller 21 can be disengaged by dragging. The puller can be made using existing technology.
[0041] On the basis of the above technical solution, the present disclosure also provides a fan assembly, referring to Figure 1 、 Figure 3 as well as Figure 5As shown in, the fan assembly may include a motor 1 and the above-mentioned centrifugal fan 2, the centrifugal fan 2 includes an impeller 21, a fan casing 23 and a fan end cover 22, the fan end cover 22 is arranged at one end of the fan casing 23, and the impeller 21 is installed in the fan casing 23, the motor 1 includes a motor casing 11, a motor end cover 12 and a motor shaft 13, the motor end cover 12 is arranged at one end of the motor casing 11, the motor shaft 13 is rotatably arranged in the motor casing 11, one end of the motor shaft 13 passes through the motor end cover 12 and the fan end cover 22 and is matched with the assembly hole 2112a of the impeller 21, through such an arrangement, when the motor 1 is running, the motor shaft 13 will drive the impeller 21 matched therewith to rotate, thereby generating negative pressure inside the fan casing 23, thereby absorbing dirt on the road through the suction nozzle connected to the fan casing 23.
[0042] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 、 Figure 9 as well as Figure 10 As shown in, a plurality of second mounting grooves 121 are formed on the motor end cover 12, and the plurality of second mounting grooves 121 are arranged at intervals along the radial direction of the motor end cover 12. The fan assembly may further include a labyrinth seal 4, which may include a sealing end cover 41 and a plurality of annular sealing teeth 42 arranged on one side of the sealing end cover 41. The sealing end cover 41 is arranged in the first mounting hole 223, and the plurality of annular sealing teeth 42 are arranged in a one-to-one correspondence in the plurality of second mounting grooves 121. A second mounting hole 411 is opened in the center of the sealing end cover 41, and the sealing end cover 41 is provided with a second mounting hole 411. The hole 411 is sleeved on the motor shaft 13 and rotates synchronously with the motor shaft 13. Through this arrangement, not only can the gap between the motor shaft 13 and the fan end cover 22 be sealed axially, but the gap between the motor end cover 12 and the fan end cover 22 can also be sealed radially. At the same time, the path of sewage entering the motor shaft 13 can be extended and the direction of travel can be changed to increase the obstruction of sewage entering the motor shaft 13. Therefore, the above technical solution can more reliably prevent sewage from entering the motor shaft 13 from all directions. The number of annular sealing teeth 42 can be two, three, or any other suitable number, which can be flexibly selected according to actual conditions and is not limited by the present disclosure.
[0043] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 and Figure 9As shown in the figure, a drainage groove 122 is radially opened on the motor end cover 12, and the drainage groove 122 is located on the side of the motor end cover 12 close to the fan end cover 22. In this way, even after the above-mentioned labyrinth seal 4 is set, some sewage still enters the motor shaft 13, and during the rotation of the motor shaft 13, these sewage flow out through the gap between the labyrinth seal 4 and the second mounting groove 121 on the motor end cover 12. Then, this part of the sewage can also flow out in time through the drainage groove 122 set on the motor end cover 12, and will not be stored between the motor end cover 12 and the fan end cover 22 to affect the normal operation of the entire fan assembly.
[0044] In the exemplary embodiments provided by the present disclosure, referring to Figure 2 As shown in the figure, in order to further reliably seal the gap between the labyrinth seal 4 and the fan end cover 22 to prevent sewage from entering through the gap between the labyrinth seal 4 and the fan end cover 22, the fan assembly can be arranged to also include a felt seal 5, at least part of the felt seal 5 is arranged in the first mounting hole 223 and is located between the fan end cover 22 and the annular sealing teeth 42.
[0045] Based on the above technical solution, the present disclosure further provides a sweeper, which includes the above-mentioned fan assembly. The relevant contents of the fan assembly have been described in detail in the above content, so to avoid repetition, the present disclosure will not repeat them here.
[0046] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.
[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0048] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A centrifugal fan, characterized in that: The centrifugal fan comprises: An impeller, wherein the impeller is provided with an assembly hole and a first water retaining ring, the assembly hole is used to cooperate with the motor shaft, and the first water retaining ring is arranged around the assembly hole; and The fan end cover is provided with a second water retaining ring and a first mounting hole extending along its own axial direction. The first mounting hole is opposite to the assembly hole and is used for the motor shaft to pass through. The second water retaining ring is arranged around the first mounting hole and extends along its own axial direction to at least partially overlap with the first water retaining ring.
2. The centrifugal fan according to claim 1, characterized in that: The fan end cover has a first side surface arranged toward the impeller and a second side surface arranged away from the impeller. The second water retaining ring is arranged on the first side surface and extends in a direction away from the first side surface. The second side surface is used to connect with the motor end cover.
3. The centrifugal fan according to claim 2, characterized in that: The first water retaining ring has a thickness in its radial direction and extends in a direction away from the impeller. A first mounting groove is formed on the end surface of the first water retaining ring. At least a portion of the second water retaining ring is inserted into the first mounting groove along its axial direction.
4. The centrifugal fan according to claim 1, characterized in that: The second water retaining ring is provided with drainage holes, which penetrate the second water retaining ring in the radial direction, and at least part of the drainage holes is located outside the overlapping area of the first water retaining ring and the second water retaining ring.
5. The centrifugal fan according to claim 2, characterized in that: The second side surface has a recessed portion and at least two protruding water guide blocks, at least two of the water guide blocks are spaced apart around the recessed portion, the water guide blocks are used to install the motor end cover and make part of the motor end cover located in the recessed portion, and two adjacent water guide blocks are used to form a water guide channel together with the motor end cover and the second side surface.
6. The centrifugal fan according to claim 1, characterized in that: The impeller includes a rear disc, which includes a rear disc body and a hub. The hub is arranged at the center of the rear disc body and extends axially toward both sides of the rear disc body. The assembly hole is axially opened on the hub. The first water retaining ring is arranged on the rear disc body. A pulling groove is provided on the outer periphery of the hub, and the pulling groove is located on a side of the rear disc body away from the fan end cover.
7. A fan assembly, characterized in that: The centrifugal fan comprises a motor and any one of claims 1 to 6, wherein the centrifugal fan comprises an impeller, a fan housing, and a fan end cover, wherein the fan end cover is arranged at one end of the fan housing, and the impeller is installed in the fan housing. The motor includes a motor housing, a motor end cover and a motor shaft. The motor end cover is arranged at one end of the motor housing. The motor shaft is rotatably arranged in the motor housing. One end of the motor shaft passes through the motor end cover and the fan end cover and is connected to the assembly hole of the impeller.
8. The fan assembly according to claim 7, characterized in that: A plurality of second mounting grooves are formed on the motor end cover, and the plurality of second mounting grooves are arranged at intervals along the radial direction of the motor end cover. The fan assembly also includes a labyrinth seal, and the labyrinth seal includes a sealing end cover and a plurality of annular sealing teeth arranged on one side of the sealing end cover. The sealing end cover is arranged in the first mounting hole, and the plurality of annular sealing teeth are arranged in a one-to-one correspondence in the plurality of second mounting grooves. A second mounting hole is opened in the center of the sealing end cover, and the sealing end cover is sleeved on the motor shaft through the second mounting hole and rotates synchronously with the motor shaft.
9. The fan assembly according to claim 8, characterized in that: A drainage groove is radially provided on the motor end cover, and the drainage groove is located on a side of the motor end cover close to the fan end cover.
10. A sweeper, characterized in that: The invention comprises a fan assembly according to any one of claims 7 to 9.