A vacuum cleaner

Abstract

This invention belongs to the field of household appliance technology and discloses a vacuum cleaner. The vacuum cleaner includes a body and a motor assembly. The motor assembly includes a motor, a water seal structure, and a pressing component. The motor includes a bearing housing, a bearing, and an output shaft. The bearing housing has a through hole, the bearing is disposed within the bearing housing, and the output shaft passes through the bearing and the through hole. The water seal structure is sleeved on the output shaft and blocks the through hole. The water seal structure is interference-fitted with the output shaft and can rotate relative to the output shaft. The pressing component is detachably connected to the motor and sleeved on the output shaft, pressing the water seal structure against the bearing housing. This vacuum cleaner can prevent wastewater from entering the through hole, thereby protecting the bearing and the internal structure of the motor, and extending the service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more particularly to a vacuum cleaner. Background Technology

[0002] As living standards improve, more and more household vacuum cleaners and mops are being used. Because they need to handle various types of dry and wet waste, the requirements for the waterproof capabilities of the motors in these dual-purpose dry and wet vacuum cleaners are becoming increasingly stringent.

[0003] Most motors on the market today lack waterproof construction, making them susceptible to the absorption of acidic or alkaline liquids into the bearings. This can lead to bearing corrosion and excessive noise within a short period, and prolonged operation can cause the bearings to disintegrate, seize, and burn out the motor. Even worse, corrosive liquids can seep into the motor's interior through bearing gaps. Over time, this corrosive liquid not only damages the motor's internal structure but can also splash into the vacuum cleaner through the motor's cooling fan, causing complete machine failure.

[0004] Some motors employ a waterproof structure, primarily by adding a waterproof gasket to the motor shaft. This gasket is a circular washer with an interference fit between its inner hole and the motor shaft. The gasket fits snugly against the upper surface of the bearing, covering the bearing dust cover and the inner ring. As the gasket rotates with the motor shaft, a certain gap remains between the outer ring of the gasket and the bearing housing. However, this waterproof structure offers very limited protection, only blocking moisture. When the amount of water is large, it can penetrate the bearing through the gap between the outer ring of the gasket and the bearing housing. If the liquid is acidic or alkaline, the bearing will fail within a short period. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum cleaner that can solve the problem of insufficient waterproof performance of motors.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A vacuum cleaner includes a body and a motor assembly disposed on the body, the motor assembly comprising:

[0008] An electric motor, comprising a bearing housing, a bearing, and an output shaft, wherein the bearing housing is provided with a through hole, the bearing is disposed in the bearing housing, and the output shaft passes through the bearing and through the through hole;

[0009] A water seal structure is sleeved on the outside of the output shaft and blocks the through hole. The water seal structure is interference-fitted with the output shaft and can rotate relative to the output shaft.

[0010] The pressing component is detachably connected to the motor and sleeved on the output shaft, and the pressing component pushes the water seal structure against the bearing chamber.

[0011] The water seal structure includes:

[0012] An elastic layer is sleeved on the outside of the output shaft and spaced apart from the output shaft. The pressing member pushes the elastic layer against the bearing chamber.

[0013] A pad is connected to the elastic layer and sleeved on the outside of the output shaft. The pad is interference-fitted with the output shaft and can rotate relative to the output shaft.

[0014] The pad is made of polytetrafluoroethylene.

[0015] The pad is annular, and its inner edge is provided with an upwardly extending abutment flange, which is interference-fitted with the output shaft.

[0016] The interference fit between the pad and the output shaft is 0.05mm-0.2mm.

[0017] The contact length between the pad and the output shaft along the axial direction of the output shaft is 0.5mm-2mm.

[0018] The elastic layer includes an annular body and an upper lip connected to the body. The upper lip surrounds the top edge of the inner wall of the body. The upper lip, the body, and the pad form a cavity for storing grease.

[0019] The upper lip extends upward from the main body along a direction close to the output shaft.

[0020] The top of the upper lip is not higher than the top surface of the pressing member.

[0021] The elastic layer includes an annular body and a lower lip connected to the body. The lower lip is arranged circumferentially along the inner side of the body, and the outer edge of the pad is disposed between the lower lip and the body.

[0022] Wherein, the dimension of the lower lip edge along the radial direction of the output shaft is not less than 1 / 3 of the dimension of the pad along the radial direction of the output shaft;

[0023] The thickness of the lower lip is 1-1.5 times the thickness of the pad.

[0024] The pad and the elastic layer are fixed by vulcanization.

[0025] The water seal structure also includes a skeleton, which is embedded in the elastic layer.

[0026] The pressing component is provided with a central hole, which includes a small-diameter hole and a large-diameter hole connected to each other. The large-diameter hole is located on the side of the small-diameter hole closer to the bearing chamber, and the bearing chamber is located inside the large-diameter hole.

[0027] The elastic layer includes a first shaft segment and a second shaft segment. The outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment. The first shaft segment is disposed in the small-diameter hole, and the second shaft segment is disposed in the large-diameter hole and abuts against the bearing chamber and the pressing member, respectively.

[0028] In the second shaft segment, the thickness of the elastic layer located above the skeleton is greater than the thickness of the elastic layer located below the skeleton.

[0029] Wherein, the thickness of the elastic layer located above the skeleton in the second shaft segment is 1.5-2 times the thickness of the pad;

[0030] The thickness of the elastic layer located below the skeleton in the second shaft segment is 0.5-1 times the thickness of the pad.

[0031] Wherein, the outer diameter of the second shaft segment is smaller than the inner diameter of the large-diameter hole, and the second shaft segment can be pressurized by external force to make an interference fit with the large-diameter hole.

[0032] The top surface of the second shaft segment is provided with an annular protrusion that abuts against the pressing member.

[0033] The cross-sectional width of the top of the annular convex ridge gradually decreases from bottom to top.

[0034] The elastic layer is provided with an annular groove, which is located on the side of the annular protrusion closer to the output shaft.

[0035] The elastic layer has a notch at its outer top edge.

[0036] The motor assembly further includes a housing, which includes a first annular limiting rib and a lower flow channel disposed outside the first annular limiting rib. The pressing member includes a cover plate, a second annular limiting rib disposed on the bottom surface of the cover plate, and an upper flow channel located outside the second annular limiting rib. The upper flow channel and the lower flow channel are disposed opposite to each other and connected. The first annular limiting rib and the second annular limiting rib are sealed and abutted together. The first annular limiting rib, the cover plate, and the second annular limiting rib form a cavity for accommodating the motor.

[0037] The pressing component further includes a blade wheel, which includes an annular inner rib, an annular outer rib, and a plurality of blades connecting the annular inner rib and the annular outer rib. The annular outer rib and the annular inner rib form the upper flow channel. The annular inner rib is sleeved on the outside of the cover plate and connected to the cover plate.

[0038] Either the top end of the first annular limiting rib or the bottom end of the second annular limiting rib is provided with a sealing ring groove, and a sealing ring is provided in the sealing ring groove, the sealing ring being sandwiched between the first annular limiting rib and the second annular limiting rib.

[0039] The bottom surface of the sealing ring groove is provided with a sealing protrusion.

[0040] The cross-sectional width of the sealing ridge gradually decreases from bottom to top.

[0041] The beneficial effects of this invention are:

[0042] In the vacuum cleaner provided by the present invention, the through hole of the bearing chamber is blocked by a water seal structure, and the inner wall of the water seal structure is sealed by interference fit with the output shaft. The outer side of the water seal structure is sealed by pressing against the bearing chamber by a pressing member, which can prevent sewage from entering the through hole, thereby protecting the bearing and the internal structure of the motor and extending the service life of the motor. The pressing member can be detachably connected to the motor, which is convenient for maintenance or replacement of the water seal structure. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the motor assembly provided by the present invention;

[0044] Figure 2 This is a cross-sectional view of the motor assembly provided by the present invention;

[0045] Figure 3 This is a partial enlarged view of the water seal structure in the motor assembly provided by the present invention;

[0046] Figure 4 This is a schematic diagram of the water seal structure provided by the present invention;

[0047] Figure 5 This is an axial sectional view of the water seal structure provided by the present invention;

[0048] Figure 6 This is a cross-sectional view of the pressing component and the lower cover provided by the present invention after assembly;

[0049] Figure 7 yes Figure 6 A magnified view of a section at point A in the middle;

[0050] Figure 8 This is a schematic diagram of the pressing component provided by the present invention. Figure 1 ;

[0051] Figure 9 This is a schematic diagram of the pressing component provided by the present invention. Figure 2 ;

[0052] Figure 10 This is a cross-sectional view of the pressing component provided by the present invention.

[0053] In the picture:

[0054] 1. Upper cover; 11. Flow channel inlet; 12. Guide surface; 2. Lower cover; 21. First annular limiting rib; 211. Sealing ring groove; 2111. Sealing protrusion; 22. Lower flow channel; 3. Motor; 31. Output shaft; 32. Bearing; 33. Bearing chamber; 34. Through hole; 4. Moving impeller; 5. Pressing component; 50. Upper flow channel; 51. Cover plate; 511. Center hole; 5111. Small diameter hole; 5112. Large diameter hole; 52. Second annular limiting rib; 53. First impeller; 531. First annular outer rib; 532. First annular inner rib; 533. First blade; 534. Engulfing protrusion; 541. Second annular outer rib; 542. Second annular inner rib; 543. Second blade; 54. Second impeller; 6. Water seal structure; 61. Elastic layer; 611. First shaft section; 6111. Upper lip; 6112. Lower lip; 612. Second shaft section; 6121. Annular ridge; 6122. Annular groove; 6123. Notch; 62. Pad; 621. Abutting flange; 63. Skeleton; 64. Grease; 7. Sealing ring. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0056] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0059] This embodiment provides a vacuum cleaner, including a body and a motor assembly. The motor assembly can create a negative pressure inside the body to draw in fluid carrying dirt, thereby achieving a cleaning purpose.

[0060] like Figure 1 and Figure 2 As shown, the motor assembly includes a housing, a motor 3 disposed inside the housing, and a moving impeller 4. The housing has a flow channel inlet 11. The motor 3 is fixed inside the housing, and the output shaft 31 of the motor 3 is connected to the moving impeller 4. The motor 3 drives the moving impeller 4 to rotate, which will create a negative pressure inside the housing, allowing external airflow to enter the machine body, then enter the housing through the flow channel inlet, and flow downstream of the motor assembly. Figure 2 The direction indicated by the dashed line is the direction of fluid flow.

[0061] To facilitate the assembly of the motor 3, impeller 4, and housing, the housing includes an upper housing 1 and a lower housing 2. The upper housing 1 and the lower housing 2 are detachable, allowing for easy maintenance or replacement of the motor 3 and impeller 4 inside the housing by disassembling and assembling the housing.

[0062] Optionally, one of the upper cover 1 and the lower cover 2 is provided with a fixing post, and the other is provided with a fixing lug. The screw passes through the fixing lug and connects to the fixing post to fix the upper cover 1 and the lower cover 2.

[0063] Optionally, the inner wall of the upper cover 1 is provided with a guide surface 12, which can guide the flow direction of the fluid so that the fluid enters the lower cover 2.

[0064] To reduce the resistance encountered when the impeller 4 rotates, the motor 3 also includes a housing and a bearing 32 disposed within the housing. The outer ring of the bearing 32 is fixed to the housing, and the inner ring of the bearing 32 is coaxial with and fixed to the output shaft 31. By providing the bearing 32, rotational support can be provided for the rotation of the output shaft 31, improving the stability of the impeller 4's rotation and reducing resistance.

[0065] Specifically, the housing comprises a bearing chamber 33 for accommodating the bearing 32, and the bearing chamber 33 is provided with a through hole 34 that allows the output shaft 31 to pass through. To avoid the output shaft 31 contacting the inner wall of the through hole 34 and increasing resistance, the diameter of the through hole 34 is larger than the outer diameter of the output shaft 31, so that the output shaft 31 and the inner wall of the through hole 34 are spaced apart to avoid contact.

[0066] To better meet user needs, this vacuum cleaner can be used both wet and dry, meaning it can vacuum both dust and wastewater, thus expanding its application range and improving cleaning efficiency. To meet the requirement of vacuuming wastewater, the motor assembly needs to have good waterproof performance to prevent wastewater from entering the motor housing.

[0067] The existing motor assembly only has a waterproof gasket on the outer sleeve of the output shaft 31. The waterproof gasket is interference-fitted with the output shaft 31 so that it rotates with the output shaft 31. The waterproof gasket is tightly attached to the upper surface of the bearing 32, covering the bearing dust cover and the inner ring of the bearing 32. The waterproof gasket is at least partially located in the through hole 34. Because the waterproof gasket rotates with the motor shaft 3, in order to reduce resistance, a certain gap is left between the outer ring of the waterproof gasket and the inner wall of the through hole 34 on the bearing housing 33. This results in very limited protection capability of the waterproof structure, which can only block water vapor. When the amount of water is large, water can penetrate into the bearing 32 through the gap between the outer ring of the waterproof gasket and the inner wall of the through hole 34. If it is an acidic or alkaline liquid, the bearing 32 will fail in a short time.

[0068] To address the aforementioned problems, this embodiment improves the waterproof structure of the motor assembly to enhance its waterproof performance. Specifically, as follows... Figure 2 and Figure 3As shown, the motor assembly also includes a water seal structure 6 and a pressing member 5. The water seal structure 6 is an annular structure, sleeved on the output shaft 31. The inner wall of the water seal structure 6 is interference-fitted with the output shaft 31 and can rotate relative to the output shaft 31. The pressing member 5 is disposed between the impeller 4 and the motor 3. The pressing member 5 is used for detachably installing the motor 3. The output shaft 31 of the motor 3 passes through the pressing member 5 and connects to the impeller 4. The pressing member 5 abuts the water seal structure 6 against the motor 3. In this embodiment, the water seal structure 6 blocks the through hole 34 of the bearing chamber 33. The interference fit between the inner wall of the water seal structure 6 and the output shaft 31 achieves a seal. The outer side of the water seal structure 6 is sealed by the pressing member 5 against the outer end face of the bearing chamber 33. This prevents sewage from entering the through hole 34, thereby protecting the bearing 32 and the internal structure of the motor 3 and extending the service life of the motor 3. In addition, the pressing part 5 and the motor 3 can be detached and connected. When it is necessary to maintain or replace the water seal structure 6, it is only necessary to disassemble the pressing part 5 and the motor 3, which facilitates the maintenance and replacement of the water seal structure 6.

[0069] like Figure 3 As shown, the water seal structure 6 includes an elastic layer 61 and a pad 62 connected to the elastic layer 61. Both the pad 62 and the elastic layer 61 are annular structures and are sleeved on the outside of the output shaft 31. The pad 62 is interference-fitted with the output shaft 31 and can rotate relative to the output shaft 31, while the elastic layer 61 is clearance-fitted with the output shaft 31. The pressing member 5 abuts against the elastic layer 61 and presses the elastic layer 61 against the bearing chamber 33. When the elastic layer 61 is subjected to the abutting force of the pressing member 5, it will undergo elastic deformation, thereby better sealing the gap between the pressing member 5 and the bearing chamber 33. By setting the pad 62 to be interference-fitted with the output shaft 31, the hardness of the pad 62 is greater than that of the elastic layer 61. This can reduce the contact friction between the output shaft 31 and the pad 62 while sealing the gap between the inner side of the water seal structure 6 and the output shaft 31, thus avoiding affecting the performance of the motor 3.

[0070] Furthermore, the pad 62 is made of polytetrafluoroethylene (PTFE). PTFE, commonly known as the "king of plastics," is heat-resistant and has an extremely low coefficient of friction, thus providing lubrication. By using PTFE to make the pad 62, self-lubrication can be achieved while ensuring an interference fit between the pad 62 and the output shaft 31, reducing the friction between the pad 62 and the output shaft 31. This minimizes the impact on the efficiency of the motor 3 while ensuring its normal operation.

[0071] To further improve the waterproofing effect, an appropriate interference fit can be increased without affecting the efficiency of motor 3 to ensure the waterproofing effect. Optionally, the interference fit between the pad 62 and the output shaft 31 can be 0.05mm-0.2mm. It should be noted that the interference fit between the pad 62 and the output shaft 31 is the difference between the outer diameter of the output shaft 31 and the inner diameter of the pad 62, wherein the outer diameter of the output shaft 31 is larger than the inner diameter of the pad 62.

[0072] like Figure 4 As shown, to further improve the sealing effect at the mating point between the gasket 62 and the output shaft 31, an upwardly extending abutment flange 621 is provided on the inner edge of the gasket 62. The abutment flange 621 is interference-fitted with the output shaft 31. By providing the abutment flange 621, a certain contact length along the axial direction of the output shaft 31 can be ensured between the gasket 62 and the output shaft 31, which is beneficial to ensuring good contact between the output shaft 31 and the gasket 62, thereby improving the sealing effect. The contact length is the axial length along the output shaft 31. It should be noted that the inner hole of the gasket 62 is formed by the abutment flange 621, and the interference between the gasket 62 and the output shaft 31 is the difference between the outer diameter of the output shaft 31 and the diameter of the inner hole formed by the abutment flange 621.

[0073] Optionally, the contact length between the pad 62 and the output shaft 31 can be 0.5mm-2mm. Within this range, the pad 62 and the output shaft 31 can have a certain contact length to ensure the sealing effect. At the same time, it can avoid excessive contact area leading to increased rotational friction, thereby minimizing the impact on the rotation of the output shaft 31.

[0074] In this embodiment, the elastic layer 61 can be made of rubber. Preferably, the elastic layer 61 is made of nitrile butadiene rubber (NBR). NBR has excellent oil resistance, high abrasion resistance, good heat resistance, strong adhesion, long service life, and good sealing performance.

[0075] To improve the fixing effect between the pad 62 and the elastic layer 61, the pad 62 and the elastic layer 61 can be fixed by vulcanization to form an integral structure. This fixing method does not require additional fasteners and the fixing effect is reliable.

[0076] To further improve the fixing effect between the pad 62 and the elastic layer 61, the elastic layer 61 includes an annular main body and a lower lip 6112 connected to the main body. The lower lip 6112 is a circumferentially arranged annular structure surrounding the inner side of the main body, and the outer edge of the pad 62 is located between the lower lip 6112 and the main body. By providing the lower lip 6112, the contact area between the pad 62 and the elastic layer 61 can be increased, which is beneficial to improving the fixing effect between the pad 62 and the elastic layer 61.

[0077] It is understandable that the larger the radial dimension of the lower lip 6112 along the output shaft 31, the larger the contact area between the lower lip 6112 and the pad 62, and correspondingly, the better the fixing effect between the pad 62 and the elastic layer 61. Preferably, the radial dimension of the lower lip 6112 along the output shaft 31 is not less than 1 / 3 of the radial dimension of the pad 62 along the output shaft 31, so as to ensure the fixing effect between the pad 62 and the elastic layer 61.

[0078] Understandably, the greater the thickness of the lower lip 6112, the better the fixing effect between the pad 62 and the elastic layer 61. Preferably, the thickness of the lower lip 6112 is 1-1.5 times the thickness of the pad 62, to ensure that the lower lip 6112 can firmly wrap the pad 62.

[0079] In this embodiment, the lower lip 6112 has a radial dimension of 3mm along the output shaft 31 and a thickness of 1mm.

[0080] Specifically, the pressing member 5 is provided with a central hole 511, through which the output shaft 31 extends out of the pressing member 5. The central hole 511 includes a small-diameter hole 5111 and a large-diameter hole 5112 connected to each other. The diameter of the large-diameter hole 5112 is larger than that of the small-diameter hole 5111, and it is located at the end of the small-diameter hole 5111 closer to the motor 3. The bearing housing 33 is located inside the large-diameter hole 5112. Figure 4 As shown, the elastic layer 61 includes a first shaft segment 611 and a second shaft segment 612. The outer diameter of the first shaft segment 611 is smaller than the outer diameter of the second shaft segment 612. The first shaft segment 611 is disposed in the small diameter hole 5111, and the second shaft segment 612 is disposed in the large diameter hole 5112 and abuts against the bearing chamber 33 and the pressing member 5 respectively.

[0081] To further improve the waterproof effect of the motor assembly, the outer diameter of the second shaft section 612 is smaller than the inner diameter of the large diameter hole 5112, so that the second shaft section 612 can be clearance-fitted with the large diameter hole 5112 when not subjected to external force, which facilitates the installation of the water seal structure 6 into the center hole 511.

[0082] The difference between the inner diameter of the second shaft section 612 and the large diameter hole 5112 should not be too large, so that when the second shaft section 612 is subjected to the squeezing force of the pressing member 5, the second shaft section 612 can deform so that at least part of the outer wall of the second shaft section 612 fits with the inner wall of the large diameter hole 5112, so that the second shaft section 612 and the large diameter hole 5112 are interference fit, thereby further improving the waterproof effect.

[0083] Optionally, the pad 62 is located on the side of the first shaft segment 611 along the axial direction of the output shaft 31, close to the bearing housing 33, to support the elastic layer 61. Compared to using the elastic layer 61 as a structural component supporting the pad 62, the pad 62 supporting the first shaft segment 611 can prevent the first shaft segment 611 from falling under gravity, prevent the first shaft segment 611 from contacting the output shaft 31, and also prevent the pad 62 from tilting due to deformation of the elastic layer 61 under the gravity or other external forces, thereby affecting the fit between the pad 62 and the output shaft 31 and thus avoiding affecting the performance of the motor 3.

[0084] like Figure 4As shown, the water seal structure 6 also includes a skeleton 63, which is embedded within the elastic layer 61. The skeleton 63 is made of a rigid material and provides support for the elastic layer 61, improving the overall strength of the water seal structure 6 and preventing the elastic layer 61 from becoming misaligned, which would reduce the sealing effect. To enhance the support effect of the skeleton 63 on the elastic layer 61, the shape of the skeleton 63 is adapted to the shape of the elastic layer 61, so as to provide a certain supporting force at various positions of the elastic layer 61 and prevent excessive deformation of the elastic layer 61 from affecting the sealing effect.

[0085] Optionally, the frame 63 can be made of steel plate to provide sufficient strength. It is understood that the thickness of the frame 63 can be adjusted according to the size of the bearing 32. When the bearing 32 is larger, the corresponding shaft diameter of the output shaft 31 and the overall size of the motor 3 are also larger, resulting in increased clamping force applied by the pressing member 5 to the elastic layer 61 and a larger contact area. To ensure sufficient strength of the water seal structure 6, the thickness of the frame 63 can be increased accordingly. In this embodiment, the thickness of the frame 63 is 0.4 mm.

[0086] Furthermore, the thickness of the elastic layer 61 above the skeleton 63 in the second shaft segment 612 is greater than the thickness of the elastic layer 61 below the skeleton 63. The greater thickness of the elastic layer 61 above the skeleton 63 in the second shaft segment 612 improves the elastic contact effect between the elastic layer 61 and the pressing member 5, thereby enhancing the sealing effect. The smaller thickness of the elastic layer 61 below the skeleton 63 in the second shaft segment 612 ensures that the water seal structure 6 remains fixed relative to the bearing chamber 33 when subjected to the abutment force of the pressing member 5, preventing the water seal structure 6 from tilting. This helps maintain the coaxial state of the water seal structure 6 and the output shaft 31 of the motor 3, thus preventing a decrease in the sealing effect between the water seal structure 6 and the output shaft 31.

[0087] Preferably, the thickness of the elastic layer 61 above the skeleton 63 in the second shaft segment 612 is 1.5-2 times the thickness of the skeleton 63, and the thickness of the elastic layer 61 below the skeleton 63 in the second shaft segment 612 is 0.5-1 times the thickness of the skeleton 63.

[0088] To further improve the waterproof effect, the elastic layer 61 also includes an upper lip 6111, which is connected to the inner edge of the main body and is arranged circumferentially around the main body. The upper lip 6111, the inner edge of the main body, and the pad 62 form a cavity for storing grease 64. The grease 64 forms an oil layer on the output shaft 31 to increase the sealing performance and provide lubrication for the pad 62, which can further reduce the friction between the pad 62 and the output shaft 31, thereby avoiding affecting the efficiency of the motor 3.

[0089] Furthermore, the upper lip 6111 is fitted with the output shaft 31 with a clearance, which can prevent some particles from entering the water seal structure 6 and also prevent the grease 64 from overflowing. In this embodiment, the gap between the upper lip 6111 and the output shaft 31 is about 0.1 mm, which can effectively prevent particles larger than 0.1 mm from entering the water seal structure 6.

[0090] Furthermore, the upper lip 6111 extends upward from the main body along the direction close to the output shaft 31, that is, the upper lip 6111 has an upward-curving structure. By setting the upper lip 6111 to an upward-curving structure, the volume of the cavity can be increased, thereby injecting a sufficient amount of lubricating grease 64; in addition, the upward-curving structure of the upper lip 6111 also has a certain function of blocking impurities. Impurities can be guided by the outer wall of the upper lip 6111 to move away from the output shaft 31, which can prevent impurities from entering the water seal structure 6 through the gap between the upper lip 6111 and the output shaft 31.

[0091] Optionally, the amount of grease 64 injected into the cavity can be 60%-80% of the cavity volume. This range of grease 64 can ensure that there is enough grease 64 to meet the needs of use, and can also avoid excessive overflow and waste of grease 64.

[0092] Since the liquid sucked up by the wet and dry vacuum cleaner may have acid or alkaline properties, in order to ensure that the grease 64 is not damaged by the liquid with acid or alkaline properties, in this embodiment, the grease 64 is selected as Klüber BN71 grease.

[0093] In this embodiment, the water seal structure 6 forms a triple seal. The first seal is achieved through the gap between the upper lip 6111 and the output shaft 31, which prevents some particles from entering the water seal structure 6. The second seal is achieved through grease 64, which forms an oil layer on the output shaft 31 to increase sealing performance. The third seal is achieved through the interference fit between the gasket 62 and the output shaft 31. This triple seal improves the waterproof performance of the motor assembly, prevents damage to structures such as the bearing 32 inside the motor 3, and helps extend the service life of the motor assembly.

[0094] To avoid interference between the upper lip 6111 and the moving impeller 4, the top of the upper lip 6111 is not higher than the top surface of the pressing member 5, so that there is a certain safe distance between the upper lip 6111 and the moving impeller 4, avoiding contact between the upper lip 6111 and the moving impeller 4, thereby avoiding wear on the upper lip 6111 and reducing the resistance experienced by the moving impeller 4. Optionally, the minimum distance between the upper lip 6111 and the moving impeller 4 is 1.5mm-2.5mm.

[0095] To improve the sealing effect between the pressing element 5 and the elastic layer 61, such as Figure 4 and Figure 5As shown, the top surface of the second shaft segment 612 is provided with an annular protrusion 6121 that abuts against the pressing member 5. After the pressing member 5 is fixed to the motor 3, the pressing member 5 first abuts against the annular protrusion 6121. The annular protrusion 6121 deforms under force, which can seal the gap between the elastic layer 61 and the pressing member 5, thereby improving the sealing effect.

[0096] Furthermore, the cross-sectional width of the top of the annular ridge 6121 gradually decreases from bottom to top, making the top of the annular ridge 6121 a pointed tip. The tip is more easily flattened when subjected to force, which helps to improve the sealing effect. For example, the cross-section of the annular ridge 6121 can be triangular, with the apex of the triangle facing upwards.

[0097] Because the elastic layer 61 deforms in all directions when the annular ridge 6121 is compressed, an annular groove 6122 is also provided on the elastic layer 61 to provide deformation space. The annular groove 6122 is located on the side of the annular ridge 6121 closest to the output shaft 31, that is, the annular groove 6122 is located on the inner side of the annular ridge 6121. By providing the annular groove 6122, deformation space can be provided for the material of the elastic layer 61 when the annular ridge 6121 is compressed, which helps the elastic layer 61 to deform smoothly under the pressure of the pressing member 5, thereby improving the sealing effect.

[0098] Furthermore, a notch 6123 is provided on the outer edge of the top surface of the second shaft segment 612. The notch 6123 provides space for the elastic material to deform, allowing the elastic layer 61 at the second shaft segment 612 to be smoothly compressed. When the second shaft segment 612 is deformed by the pressing force of the pressing member 5, the elastic layer 61 at the second shaft segment 612 deforms into the notch 6123, so that the elastic material fills the notch 6123 and contacts the apex position of the large-diameter hole 5112. This allows the elastic layer 61 at the second shaft segment 612 to better fit against the inner wall of the large-diameter hole 5112 without affecting the deformation of the elastic layer 61, which is beneficial to improving the sealing effect.

[0099] In this embodiment, both the annular groove 6122 and the notch 6123 are disposed on the upper part of the second shaft segment 612, such that the annular groove 6122 and the notch 6123 are disposed close to the annular protrusion 6121. The annular protrusion 6121 is located at the force-bearing position of the pressing member 5. By disposing the annular groove 6122 and the notch 6123 close to the force-bearing position, better expansion space can be provided for the elastic material.

[0100] like Figure 6 As shown, in this embodiment, a fluid channel is formed between the pressing member 5 and the lower cover 2, and this fluid channel is connected to the fluid inlet on the upper cover 1. To further improve the waterproof performance of the motor 3, a cavity for mounting the motor 3 is formed between the pressing member 5 and the lower cover 2. The cavity is separated from the fluid channel to prevent fluid from entering the cavity.

[0101] Specifically, the lower cover 2 includes a first annular limiting rib 21 and a lower flow channel 22 surrounding the outside of the first annular limiting rib 21. The pressing member 5 includes a cover plate 51, a second annular limiting rib 52 disposed on the bottom surface of the cover plate 51, and an upper flow channel 50 located outside the second annular limiting rib 52. The upper flow channel 50 and the lower flow channel 22 are joined to form a fluid channel. The first annular limiting rib 21 and the second annular limiting rib 52 abut and seal to form a cavity for mounting the motor 3. By sealing and abutting with the first annular limiting rib 21 and the second annular limiting rib 52, the fluid channel and the cavity can be separated, preventing fluid in the fluid channel from entering the cavity.

[0102] like Figure 7 As shown, the top of the first annular limiting rib 21 is provided with a sealing ring groove 211, and a sealing ring 7 is provided in the sealing ring groove 211. The bottom end of the second annular limiting rib 52 abuts against the sealing ring 7 and presses the sealing ring 7 into the sealing ring groove 211, thereby achieving a sealed connection between the first annular limiting rib 21 and the second annular limiting rib 52.

[0103] Furthermore, a sealing ridge 2111 is also provided on the bottom surface of the sealing ring groove 211. When the second annular limiting rib 52 abuts against the sealing ring 7 downwards, it can press the sealing ring 7 tightly onto the sealing ridge 2111. The sealing ring 7 deforms and completely fits the surface of the sealing ridge 2111, which can increase the deformation of the sealing ring 7 and improve the sealing effect.

[0104] Optionally, at least two sealing ridges 2111 may be provided, with the at least two sealing ridges 2111 spaced apart and abutting against the sealing ring 7 respectively, which can further improve the sealing effect.

[0105] Optionally, the cross-sectional width of the sealing ridge 2111 gradually decreases from bottom to top. This shape of the sealing ridge 2111 abuts against the sealing ring 7, making the sealing ring 7 easier to deform and improving the fit between the sealing ring 7 and the sealing ridge 2111, thereby improving the sealing effect.

[0106] In some embodiments, the sealing ridge 2111 is provided on the second annular limiting rib 52, and the sealing ridge 2111 is provided on both sides of the second annular limiting rib 52. The sealing ridge 2111 abuts against the sealing ring 7 from the top, which can also improve the sealing effect.

[0107] In this embodiment, the pressing member 5 can be used as a fixed impeller, and the pressing member 5 can work with the moving impeller 4 to enhance the airflow control and airflow guidance effects. Figure 8As shown, the pressing component 5 also includes a first impeller 53 and a second impeller 54. The first impeller 53 and the second impeller 54 are coaxially arranged and connected. The first impeller 53 and the second impeller 54 are sleeved on the outer periphery of the cover plate 51, and the first impeller and the second impeller form the upper flow channel 50. By setting the first impeller 53 and the second impeller 54, the flow direction of the fluid can be guided, which is beneficial to improving the efficiency of the motor assembly.

[0108] like Figure 9 and Figure 10 As shown, the first impeller 53 includes a first annular inner rib 532 and a first annular outer rib 531 spaced apart. The first annular outer rib 531 is sleeved on the outside of the first annular inner rib 532. A plurality of first blades 533 are arranged between the first annular inner rib 532 and the first annular outer rib 531. When the motor assembly is started, fluid passes between the first annular inner rib 532 and the first annular outer rib 531, and the fluid flow direction is changed under the guidance of the first blades 533 so that the fluid flows according to a preset trajectory.

[0109] When the motor assembly starts, the fluid passes between the first annular inner rib 532 and the first annular outer rib 531, and changes the direction of fluid flow under the guidance of the first blade 533, so that the fluid flows according to a preset trajectory.

[0110] The second impeller 54 is structurally similar to the first impeller 53. The second impeller 54 includes spaced-apart second annular inner ribs 542 and second annular outer ribs 541. The second annular outer ribs 541 are sleeved on the outside of the second annular inner ribs 542. Multiple second blades 543 are disposed between the second annular inner ribs 542 and the second annular outer ribs 541. The second annular inner ribs 542 are located directly below and connected to the first annular inner ribs 532, and the second annular outer ribs 541 are located directly below and connected to the first annular outer ribs 531, so that fluid passing between the first impellers 53 can smoothly enter the second impeller 54.

[0111] In this embodiment, the cooperation between the first impeller 53 and the second impeller 54 can improve the guiding effect on the fluid, which is beneficial to improving the efficiency of the motor assembly.

[0112] Optionally, the first impeller 53 and the second impeller 54 can be connected by screws for easy disassembly and assembly, thereby allowing the selection of the number of impellers to be used as needed, and also facilitating the replacement of the first impeller 53 and the second impeller 54.

[0113] In some embodiments, the pressing member 5 may only have a first impeller 53 to simplify the structure of the pressing member 5.

[0114] In this embodiment, the first impeller 53, the cover plate 51 and the second annular limiting rib 52 are integrally formed, which can improve the fixing effect of the three, avoid the need to add extra fasteners, reduce the number of parts of the pressing part 5, and facilitate disassembly and assembly.

[0115] In this embodiment, a locking protrusion 534 is also provided on the outer wall of the first impeller 53, and a buckle is provided on the upper cover 1. The buckle can cooperate with the locking protrusion 534 to fix the pressing member 5 to the upper cover 1, thereby improving the stability of the motor assembly structure.

[0116] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A vacuum cleaner, comprising a body and a motor assembly disposed on the body, characterized in that, The motor assembly includes: The motor (3) includes a bearing housing (33), a bearing (32) and an output shaft (31). The bearing housing (33) is provided with a through hole. The bearing (32) is disposed in the bearing housing (33). The output shaft (31) passes through the bearing (32) and through the through hole. A water seal structure (6) is sleeved outside the output shaft (31) and blocks the through hole. The water seal structure (6) is interference-fitted with the output shaft (31) and can rotate relative to the output shaft (31). The pressing member (5) is detachably connected to the motor (3) and sleeved on the output shaft (31). The pressing member (5) pushes the water seal structure (6) against the bearing chamber (33). The motor assembly also includes a housing, which includes an upper housing (1) and a lower housing (2), and the pressing member (5) is disposed between the upper housing (1) and the lower housing (2); The upper cover (1) is provided with a flow channel inlet (11), the pressing member (5) includes an upper flow channel (50), the lower cover (2) includes a lower flow channel (22), the upper flow channel (50) and the lower flow channel (22) are arranged opposite to each other and connected to form a fluid channel, and the fluid channel is connected to the flow channel inlet (11); A cavity for mounting the motor (3) is formed between the pressing member (5) and the lower cover (2), and the cavity is separated from the fluid channel.

2. The vacuum cleaner according to claim 1, characterized in that, The water seal structure (6) includes: An elastic layer (61) is sleeved on the outside of the output shaft (31) and is spaced apart from the output shaft (31). The pressing member (5) pushes the elastic layer (61) against the bearing chamber (33). A pad (62) is connected to the elastic layer (61) and sleeved on the outside of the output shaft (31). The pad (62) is interference-fitted with the output shaft (31) and can rotate relative to the output shaft (31).

3. The vacuum cleaner according to claim 2, characterized in that, The pad (62) is made of polytetrafluoroethylene.

4. The vacuum cleaner according to claim 2, characterized in that, The pad (62) is annular, and the inner edge of the pad (62) is provided with an upwardly extending abutment flange (621), which is interference-fitted with the output shaft (31).

5. The vacuum cleaner according to claim 2, characterized in that, The interference fit between the pad (62) and the output shaft (31) is 0.05mm-0.2mm.

6. The vacuum cleaner according to claim 2, characterized in that, The contact length between the pad (62) and the output shaft (31) along the axial direction of the output shaft (31) is 0.5mm-2mm.

7. The vacuum cleaner according to claim 2, characterized in that, The elastic layer (61) includes an annular body and an upper lip (6111) connected to the body. The upper lip (6111) is disposed around the top edge of the inner wall of the body. The upper lip (6111), the body and the pad (62) form a cavity for storing grease (64).

8. The vacuum cleaner according to claim 7, characterized in that, The upper lip (6111) extends upward from the body along a direction close to the output shaft (31).

9. The vacuum cleaner according to claim 7, characterized in that, The top of the upper lip (6111) is not higher than the top surface of the pressing member (5).

10. The vacuum cleaner according to claim 2, characterized in that, The elastic layer (61) includes an annular body and a lower lip (6112) connected to the body. The lower lip (6112) is arranged circumferentially along the inner side of the body, and the outer edge of the pad (62) is disposed between the lower lip (6112) and the body.

11. The vacuum cleaner according to claim 10, characterized in that, The radial dimension of the lower lip (6112) along the output shaft (31) is not less than 1 / 3 of the radial dimension of the pad (62) along the output shaft (31); The thickness of the lower lip (6112) is 1-1.5 times the thickness of the pad (62).

12. The vacuum cleaner according to claim 2, characterized in that, The pad (62) is vulcanized and fixed to the elastic layer (61).

13. The vacuum cleaner according to claim 2, characterized in that, The water seal structure (6) also includes a skeleton (63), which is embedded in the elastic layer (61).

14. The vacuum cleaner according to claim 13, characterized in that, The pressing member (5) is provided with a central hole (511), the central hole (511) includes a small diameter hole (5111) and a large diameter hole (5112) connected to each other, the large diameter hole (5112) is located on the side of the small diameter hole (5111) close to the bearing chamber (33), and the bearing chamber (33) is located inside the large diameter hole (5112); The elastic layer (61) includes a first shaft segment (611) and a second shaft segment (612). The outer diameter of the first shaft segment (611) is smaller than the outer diameter of the second shaft segment (612). The first shaft segment (611) is disposed in the small diameter hole (5111), and the second shaft segment (612) is disposed in the large diameter hole (5112) and abuts against the bearing chamber (33) and the pressing member (5) respectively.

15. The vacuum cleaner according to claim 14, characterized in that, The thickness of the elastic layer (61) above the skeleton (63) in the second shaft segment (612) is greater than the thickness of the elastic layer (61) below the skeleton (63).

16. The vacuum cleaner according to claim 14, characterized in that, The thickness of the elastic layer (61) located above the skeleton (63) in the second shaft segment (612) is 1.5-2 times the thickness of the pad (62); The thickness of the elastic layer (61) located below the skeleton (63) in the second shaft segment (612) is 0.5-1 times the thickness of the pad (62).

17. The vacuum cleaner according to claim 14, characterized in that, The outer diameter of the second shaft segment (612) is smaller than the inner diameter of the large diameter hole (5112), and the second shaft segment (612) can be pressurized with the large diameter hole (5112) when subjected to external force.

18. The vacuum cleaner according to claim 17, characterized in that, The top surface of the second shaft segment (612) is provided with an annular protrusion (6121) that abuts against the pressing member (5).

19. The vacuum cleaner according to claim 18, characterized in that, The cross-sectional width of the top of the annular protrusion (6121) gradually decreases from bottom to top.

20. The vacuum cleaner according to claim 18, characterized in that, An annular groove (6122) is provided on the elastic layer (61), and the annular groove (6122) is located on the side of the annular protrusion (6121) near the output shaft (31).

21. The vacuum cleaner according to claim 18, characterized in that, The outer top edge of the elastic layer (61) is provided with a notch (6123).

22. The vacuum cleaner according to any one of claims 1-21, characterized in that, The lower cover (2) includes a first annular limiting rib (21), and the lower flow channel (22) is disposed outside the first annular limiting rib (21). The pressing member (5) also includes a cover plate (51) and a second annular limiting rib (52) disposed on the bottom surface of the cover plate (51). The upper flow channel (50) is located outside the second annular limiting rib (52). The first annular limiting rib (21) and the second annular limiting rib (52) are sealed and abutted together. The first annular limiting rib (21), the cover plate (51) and the second annular limiting rib (52) form the cavity.

23. The vacuum cleaner according to claim 22, characterized in that, The pressing component (5) also includes a blade wheel, which includes an annular inner rib, an annular outer rib, and a plurality of blades connecting the annular inner rib and the annular inner rib. The annular outer rib and the annular inner rib form the upper flow channel (50). The annular inner rib is sleeved on the cover plate (51) and connected to the cover plate (51).

24. The vacuum cleaner according to claim 22, characterized in that, A sealing ring groove (211) is provided at either the top end of the first annular limiting rib (21) or the bottom end of the second annular limiting rib (52). A sealing ring (7) is provided in the sealing ring groove (211) and the sealing ring (7) is sandwiched between the first annular limiting rib (21) and the second annular limiting rib (52).

25. The vacuum cleaner according to claim 24, characterized in that, The bottom surface of the sealing ring groove (211) is provided with a sealing protrusion (2111).

26. The vacuum cleaner according to claim 25, characterized in that, The cross-sectional width of the sealing ridge (2111) gradually decreases from bottom to top.

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