CN216754347U - Motor assembly for dust collector - Google Patents

Abstract

The utility model belongs to the technical field of household appliances, and discloses a motor assembly for a dust collector. The motor assembly for the dust collector comprises a motor, a water seal structure and a pressing piece, wherein the motor comprises a bearing chamber, a bearing and an output shaft, the bearing chamber is provided with a through hole, the bearing is arranged in the bearing chamber, and the output shaft penetrates through the bearing and penetrates through the through hole; the water seal structure is sleeved outside the output shaft and shields the through hole, and the water seal structure is in interference fit with the output shaft and can rotate relative to the output shaft; the pressing piece and the motor are detachably connected and sleeved outside the output shaft, and the water seal structure is abutted to the bearing chamber by the pressing piece. This a motor element for dust catcher can avoid in sewage gets into the through-hole to play the effect of protection bearing and motor inner structure, the life of extension motor.

Description

Motor assembly for dust collector

Technical Field

The utility model relates to the technical field of dust collection equipment, in particular to a motor assembly for a dust collector.

Background

Along with the improvement of living standard, the household dust-collecting, washing and mopping all-in-one machine is used more and more, and the requirement on the waterproof capability of a motor in the dry and wet all-in-one machine is higher and higher due to the fact that various dry and wet garbage are treated.

The motor on the existing market generally does not have a waterproof structure, acid-base liquid is easily sucked into the bearing, the bearing can be corroded in a short time to cause large tail sound, the bearing can be scattered to cause the bearing to be stuck when the motor runs for a long time, and the motor is burnt. What's more, inside corrosive liquid still can permeate the motor through the gap of bearing, long-time operation, corrosive liquid not only can destroy motor inner structure to can splash to the inside complete machine that leads to of dust catcher inefficacy through the radiator fan of motor from the area.

Part of the motors adopt a certain waterproof structure, a waterproof sheet is mainly added on a motor shaft and is of a circular gasket structure, an inner hole is in interference fit with the motor shaft, and the waterproof gasket is tightly attached to the upper surface of the bearing to cover the bearing dust cover and the bearing inner ring. The waterproof gasket rotates along with the motor shaft, and a certain gap is reserved between the outer ring of the waterproof gasket and the bearing chamber. The protective capability of the waterproof structure is very limited, and only water vapor can be blocked, when the water amount is more, water energy can permeate into the bearing through the gap between the outer ring of the waterproof gasket and the bearing chamber, and if the water amount is acid-base liquid, the bearing can lose efficacy in a short time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a motor assembly for a dust collector, which can solve the problem of insufficient waterproof performance of a motor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a motor assembly for a vacuum cleaner, comprising:

the motor comprises a bearing chamber, a bearing and an output shaft, wherein the bearing chamber is provided with a through hole, the bearing is arranged in the bearing chamber, and the output shaft penetrates through the bearing and penetrates through the through hole;

the water seal structure is sleeved outside the output shaft and shields the through hole, and the water seal structure is in interference fit with the output shaft and can rotate relative to the output shaft;

the pressing piece is detachably connected with the motor and sleeved outside the output shaft, and the water seal structure is abutted to the bearing chamber by the pressing piece.

Wherein, the water seal structure includes:

the elastic layer is sleeved outside the output shaft and arranged in a clearance with the output shaft, and the elastic layer is abutted to the bearing chamber by the pressing piece;

the backing plate is connected with the elastic layer and sleeved outside the output shaft, and the backing plate is in interference fit with the output shaft and can rotate relative to the output shaft.

Wherein the backing plate is made of polytetrafluoroethylene.

The backing plate is annular, the inboard edge of backing plate is provided with the butt flange that upwards extends, the butt flange with output shaft interference fit.

The interference magnitude between the base plate and the output shaft is 0.05mm-0.2 mm.

The contact length of the base plate and the output shaft along the axial direction of the output shaft is 0.5mm-2 mm.

The elastic layer comprises an annular main body and an upper lip edge connected with the main body, the upper lip edge surrounds the top edge of the inner wall of the main body, and a cavity is enclosed by the upper lip edge, the main body and the base plate and used for storing lubricating grease.

Wherein the upper lip extends from the body in an upward inclination in a direction approaching the output shaft.

Wherein a top end of the upper lip is not higher than a top surface of the pressing member.

The elastic layer comprises an annular main body and a lower lip edge connected with the main body, the lower lip edge is arranged along the circumferential direction of the inner side of the main body, and the outer edge of the backing plate is arranged between the lower lip edge and the main body.

Wherein the size of the lower lip edge along the radial direction of the output shaft is not less than 1/3 of the size of the backing plate along the radial direction of the output shaft;

the thickness of the lower lip edge is 1-1.5 times of the thickness of the base plate.

Wherein the backing plate and the elastic layer are vulcanized and fixed.

The water seal structure further comprises a framework, and the framework is embedded in the elastic layer.

The pressing piece is provided with a central hole, the central hole comprises a small-diameter hole and a large-diameter hole which are connected, the large-diameter hole is positioned on one side, close to the bearing chamber, of the small-diameter hole, and the bearing chamber is positioned in the large-diameter hole;

the elastic layer comprises a first shaft section and a second shaft section, the outer diameter of the first shaft section is smaller than that of the second shaft section, the first shaft section is arranged in the small-diameter hole, and the second shaft section is arranged in the large-diameter hole and is respectively abutted to the bearing chamber and the pressing piece.

Wherein the thickness of the elastic layer located above the skeleton in the second shaft section is greater than the thickness of the elastic layer located below the skeleton.

The thickness of the elastic layer positioned above the framework in the second shaft section is 1.5-2 times of that of the base plate;

the thickness of the elastic layer positioned below the framework in the second shaft section is 0.5-1 time of that of the cushion plate.

The outer diameter of the second shaft section is smaller than the inner diameter of the large-diameter hole, and the second shaft section can be in interference fit with the large-diameter hole when being extruded by external force.

And the top surface of the second shaft section is provided with an annular convex rib abutted to the pressing piece.

The cross-sectional width of the top of the annular convex rib is gradually reduced from bottom to top.

The elastic layer is provided with an annular groove, and the annular groove is located on one side, close to the output shaft, of the annular convex rib.

Wherein, the outside top edge of elastic layer is provided with the breach.

The motor assembly for the dust collector further comprises a housing, the housing comprises a first annular limiting rib and a lower flow channel arranged on the outer side of the first annular limiting rib, the pressing piece comprises a cover plate, a second annular limiting rib arranged on the bottom surface of the cover plate and an upper flow channel arranged on the outer side of the second annular limiting rib, the upper flow channel and the lower flow channel are oppositely arranged and connected, the first annular limiting rib is in sealing butt joint with the second annular limiting rib, and a cavity for accommodating the motor is surrounded by the first annular limiting rib, the cover plate and the second annular limiting rib.

The pressing piece further comprises a blade wheel, the blade wheel comprises annular inner ribs, annular outer ribs and a plurality of blades, the annular inner ribs and the annular inner ribs are arranged at intervals, the blades are connected, the annular outer ribs and the annular inner ribs form the upper flow channel, and the annular inner ribs are sleeved outside the cover plate and connected with the cover plate.

The sealing ring is arranged in the sealing ring groove, and the sealing ring is clamped between the first annular limiting rib and the second annular limiting rib.

And the bottom surface of the sealing ring groove is provided with a sealing rib.

The width of the cross section of the sealing convex edge is gradually reduced from bottom to top.

The utility model has the beneficial effects that:

in the motor assembly for the dust collector, the through hole of the bearing chamber is shielded by the water seal structure, 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 abutted to the bearing chamber by the pressing piece to realize sealing, and sewage can be prevented from entering the through hole, so that the effect of protecting the bearing and the internal structure of the motor is achieved, and the service life of the motor is prolonged; the pressing piece is detachably connected with the motor, so that the water seal structure is convenient to maintain or replace.

Drawings

FIG. 1 is a schematic view illustrating a structure of a motor assembly for a vacuum cleaner according to the present invention;

FIG. 2 is a sectional view of a motor assembly for a vacuum cleaner according to the present invention;

FIG. 3 is a partially enlarged view of a water seal structure in a motor assembly for a vacuum cleaner according to the present invention;

FIG. 4 is a schematic structural diagram of a water seal structure provided by the present invention;

FIG. 5 is a cross-sectional axial view of the water seal structure provided by the present invention;

fig. 6 is a sectional view of the pressing member provided by the present invention assembled with a lower casing;

FIG. 7 is an enlarged view of a portion of FIG. 6 at A;

FIG. 8 is a first schematic structural view of a pressing member according to the present invention;

FIG. 9 is a second schematic structural view of the pressing member according to the present invention;

fig. 10 is a sectional view of a pressing member provided in the present invention.

In the figure:

1. an upper housing; 11. a flow channel inlet; 12. a guide curved surface; 2. a lower housing; 21. a first annular limiting rib; 211. a seal ring groove; 2111. sealing the convex edge; 22. a lower runner; 3. a motor; 31. an output shaft; 32. a bearing; 33. a bearing chamber; 34. a through hole; 4. a movable impeller; 5. a pressing member; 50. an upper flow passage; 51. a cover plate; 511. a central bore; 5111. a small-diameter hole; 5112. a large-diameter hole; 52. a second annular limiting rib; 53. a first vane wheel; 531. a first annular outer rib; 532. a first annular inner rib; 533. a first blade; 534. clamping convex; 541. a second annular outer rib; 542. a second annular inner rib; 543. a second blade; 54. a second blade wheel; 6. a water seal structure; 61. an elastic layer; 611. a first shaft section; 6111. an upper lip edge; 6112. a lower lip edge; 612. a second shaft section; 6121. an annular rib; 6122. an annular groove; 6123. a notch; 62. a base plate; 621. an abutment flange; 63. a framework; 64. lubricating grease; 7. and (5) sealing rings.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a dust collector which comprises a machine body and a motor assembly used for the dust collector. The motor assembly for the vacuum cleaner can form negative pressure in the machine body so as to suck dirt-carrying fluid into the machine body for cleaning.

As shown in fig. 1 and 2, the motor assembly for a vacuum cleaner includes a housing, a motor 3 provided in the housing, and a moving impeller 4. The casing is provided with a flow channel inlet 11, the motor 3 is fixed in the casing, an output shaft 31 of the motor 3 is connected with the movable impeller 4, the movable impeller 4 is driven by the motor 3 to rotate, negative pressure is formed in the casing, external air flow enters the machine body, enters the casing from the flow channel inlet and flows to the downstream of the motor assembly. The direction shown by the dotted line in fig. 2 is the flow direction of the fluid.

In order to facilitate the assembly of the motor 3 and the movable impeller 4 with the housing, the housing comprises an upper housing 1 and a lower housing 2. The upper cover shell 1 and the lower cover shell 2 are detachably connected, and the motor 3 and the movable impeller 4 in the cover shells can be conveniently maintained or replaced by detaching the cover shells.

Optionally, one of the upper casing 1 and the lower casing 2 is provided with a fixing column, and the other is provided with a fixing lug, and a screw passes through the fixing lug and then is connected with the fixing column to fix the upper casing 1 and the lower casing 2.

Alternatively, the inner wall of the upper casing 1 is provided with a guide curved surface 12, and the guide curved surface 12 can guide the flow direction of the fluid to enter the lower casing 2.

In order to reduce the resistance applied to the rotation of the movable impeller 4, the motor 3 further includes a housing and a bearing 32 disposed in the housing, an outer ring of the bearing 32 is fixed to the housing, and an inner ring of the bearing 32 is coaxial with and fixed to the output shaft 31. By providing the bearing 32, the rotation of the output shaft 31 can be supported in a rotating manner, so that the stability of the rotation of the movable impeller 4 is improved and the resistance is reduced.

Specifically, the housing is configured with a bearing chamber 33 accommodating the bearing 32, the bearing chamber 33 being provided with a through hole 34 allowing the output shaft 31 to pass therethrough. In order to avoid the contact between the output shaft 31 and the inner wall of the through hole 34 and increase the 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 from each other to avoid the contact.

In order to better meet the use requirements of users, the dust collector can be a dry-wet dual-purpose dust collector, namely the dust collector can absorb dust and sewage, so that the use range of the dust collector is enlarged, and the cleaning effect is improved. In order to meet the use requirement of the dust collector for sucking sewage, the motor assembly for the dust collector needs to have better waterproof performance so as to prevent the sewage from entering the shell of the motor 3.

In the existing motor assembly for the dust collector, only the output shaft 31 is sleeved with a waterproof gasket, the waterproof gasket is in interference fit with the output shaft 31 so as to rotate along with the output shaft 31, and the waterproof gasket is tightly attached to the upper surface of the bearing 32 to cover the dust cover of the bearing 32 and the inner ring of the bearing 32. The waterproof gasket is at least partially arranged in the through hole 34, and rotates along with the shaft of the motor 3 due to the waterproof gasket, so that resistance is reduced, a certain gap is reserved between the outer ring of the waterproof gasket and the inner wall of the through hole 34 on the bearing chamber 33, the protection capability of the waterproof structure is very limited, water vapor can be blocked only, when water is in a large amount, water can permeate into the bearing 32 through the gap between the outer ring of the waterproof gasket and the inner wall of the through hole 34, and if the water is acid-base liquid, the bearing 32 can lose efficacy in a short time.

To solve the above problems, the present embodiment improves the waterproof structure of the motor assembly for a dust collector to improve the waterproof performance. Specifically, as shown in fig. 2 and 3, the motor assembly for a vacuum cleaner further includes a water seal structure 6 and a pressing member 5. The water seal structure 6 is an annular structure, the water seal structure 6 is sleeved outside the output shaft 31, and the inner wall of the water seal structure 6 is in interference fit with the output shaft 31 and can rotate relative to the output shaft 31. The pressing piece 5 is arranged between the movable impeller 4 and the motor 3, the pressing piece 5 is used for detachably mounting the motor 3, the output shaft 31 of the motor 3 penetrates through the pressing piece 5 and then is connected with the movable impeller 4, and the water seal structure 6 is abutted to the motor 3 through the pressing piece 5. In this embodiment, shelter from through-hole 34 of bearing room 33 through water seal structure 6, the interference fit of the inner wall of water seal structure 6 and output shaft 31 realizes sealed, and the outside of water seal structure 6 supports to realizing sealed on the outer terminal surface of bearing room 33 through pressing member 5, can avoid in sewage gets into through-hole 34 to play the effect of protection bearing 32 and motor 3 inner structure, extension motor 3's life. In addition, according to the pressing piece 5 and the motor 3 detachable connections, when the water seal structure 6 needs to be maintained or replaced, only the pressing piece 5 and the motor 3 need to be detached, and the maintenance and the replacement of the water seal structure 6 are facilitated.

As shown in fig. 3, the water seal structure 6 includes an elastic layer 61 and a pad plate 62 connected to the elastic layer 61. The backing plate 62 and the elastic layer 61 are both annular structures and are sleeved outside the output shaft 31. The backing plate 62 is in interference fit with the output shaft 31 and can rotate relative to the output shaft 31, and the elastic layer 61 is in clearance fit with the output shaft 31. The presser 5 abuts the elastic layer 61, and presses the elastic layer 61 toward the bearing chamber 33. The elastic layer 61 is elastically deformed when receiving the contact force of the pressing member 5, and thereby, a gap between the pressing member 5 and the bearing chamber 33 is more preferably closed. Through setting up backing plate 62 and output shaft 31 interference fit, the elastic layer 61 is big is compared to the hardness of backing plate 62, can reduce the contact frictional force between output shaft 31 and the backing plate 62 when the clearance between inboard and the output shaft 31 of shutoff water seal structure 6, avoids influencing motor 3's performance.

Further, the backing plate 62 is made of polytetrafluoroethylene. The polytetrafluoroethylene is commonly called as plastic king, is high temperature resistant, has extremely low friction coefficient and has lubricating effect. Make backing plate 62 through polytetrafluoroethylene, can realize the self-lubricating when guaranteeing backing plate 62 and output shaft 31 interference fit, reduce the frictional force between backing plate 62 and the output shaft 31 to under the circumstances of guaranteeing motor 3 normal work, reduce the influence to motor 3 efficiency.

In order to further improve the waterproof effect, the proper magnitude of interference can be increased under the condition of not influencing the efficiency of the motor 3 so as to ensure the waterproof effect. Alternatively, the interference between the backing plate 62 and the output shaft 31 may be 0.05mm to 0.2 mm. It should be noted here that the interference between the backing plate 62 and the output shaft 31 is the difference between the outer diameter of the output shaft 31 and the hole diameter of the inner hole of the backing plate 62, wherein the outer diameter of the output shaft 31 is larger than the hole diameter of the inner hole of the backing plate 62.

As shown in fig. 4, in order to further improve the sealing effect at the joint of the backing plate 62 and the output shaft 31, the inner edge of the backing plate 62 is provided with an upwardly extending abutment flange 621, and the abutment flange 621 is in interference fit with the output shaft 31. By arranging the abutting flange 621, a certain contact length can be ensured between the backing plate 62 and the output shaft 31 along the axial direction of the output shaft 31, which is beneficial to ensuring good contact between the output shaft 31 and the backing plate 62, thereby improving the sealing effect. Wherein the contact length is along the axial length of the output shaft 31. Here, the inner hole of the shim plate 62 is surrounded by the abutment flange 621, and the interference between the shim plate 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 surrounded by the abutment flange 621.

Alternatively, the contact length of the pad plate 62 with the output shaft 31 may be 0.5mm to 2 mm. In this range, the backing plate 622 and the output shaft 31 can be ensured to have a certain contact length to ensure the sealing effect, and meanwhile, the increase of the rotation friction force caused by the excessive contact area can be avoided, so that the influence on the rotation of the output shaft 31 is reduced as much as possible.

In the present embodiment, the elastic layer 61 may be made of rubber. Preferably, the elastic layer 61 is made of Nitrile Butadiene Rubber (NBR). The NBR has the advantages of excellent oil resistance, higher wear resistance, better heat resistance, strong bonding force, longer service life and better sealing performance.

To improve the fixing effect of the pad plate 62 and the elastic layer 61, the pad plate 62 and the elastic layer 61 may be fixed by vulcanization to form an integral structure. The fixing mode does not need to additionally increase a fastener, and the fixing effect is reliable.

In order to further improve the fixing effect of the backing plate 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 an annular structure circumferentially arranged around the inner side of the main body, and the outer edge of the backing plate 62 is arranged between the lower lip 6112 and the main body. By providing the lower lip 6112, the contact area between the backing plate 62 and the elastic layer 61 can be increased, which is beneficial to improving the fixing effect of the backing plate 62 and the elastic layer 61.

It can be understood that the larger the radial dimension of the lower lip 6112 along the output shaft 31, the larger the contact area of the lower lip 6112 and the backing plate 62, and accordingly, the better the fixing effect of the backing plate 62 and the elastic layer 61. Preferably, the radial dimension of the lower lip 6112 along the output shaft 31 is not smaller than 1/3 of the pad plate 62 along the radial dimension of the output shaft 31, so as to ensure the fixing effect of the pad plate 62 and the elastic layer 61.

It is understood that the greater the thickness of the lower lip 6112, the better the fixing effect of the backing plate 62 and the elastic layer 61. Preferably, the thickness of the lower lip 6112 is 1-1.5 times the thickness of the backing plate 62 to ensure that the lower lip 6112 can securely wrap around the backing plate 62.

In this embodiment, the radial dimension of the lower lip 6112 along the output shaft 31 is 3mm, and the thickness of the lower lip 6112 is 1 mm.

Specifically, the pressing member 5 is provided with a center hole 511, and the output shaft 31 protrudes outside the pressing member 5 through the center hole 511. The center hole 511 includes a small-diameter hole 5111 and a large-diameter hole 5112 connected to each other, the large-diameter hole 5112 has a larger diameter than the small-diameter hole 5111 and is located at one end of the small-diameter hole 5111 close to the motor 3, and the bearing chamber 33 is located in the large-diameter hole 5112. As shown in fig. 4, the elastic layer 61 includes a first shaft portion 611 and a second shaft portion 612, the outer diameter of the first shaft portion 611 is smaller than the outer diameter of the second shaft portion 612, the first shaft portion 611 is disposed in the small-diameter hole 5111, and the second shaft portion 612 is disposed in the large-diameter hole 5112 and abuts against the bearing chamber 33 and the pressing member 5, respectively.

In order to further improve the waterproof effect of the motor assembly for the vacuum cleaner, 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 in clearance fit with the large-diameter hole 5112 when no external force is applied, and the water seal structure 6 is conveniently installed in the central hole 511.

The difference between the inner diameters of the second shaft section 612 and the large-diameter hole 5112 is not too large, so that when the second shaft section 612 is subjected to the extrusion force of the pressing piece 5, the second shaft section 612 can deform to enable at least part of the outer side wall of the second shaft section 612 to be attached to the inner wall of the large-diameter hole 5112, the second shaft section 612 and the large-diameter hole 5112 are in interference fit, and the waterproof effect is further improved.

Optionally, a backing plate 62 is located on one side of the first shaft section 611 near the bearing chamber 33 in the axial direction of the output shaft 31 to support the elastic layer 61. Compare as the structure of supporting backing plate 62 with elastic layer 61, backing plate 62 supports first axle section 611 and can avoid first axle section 611 to fall under the action of gravity, prevents that first axle section 611 from contacting with output shaft 31, can also avoid elastic layer 61 to lead to backing plate 62 skew when warping under the action of gravity or other external forces of backing plate 62 to influence the cooperation of backing plate 62 and output shaft 31, thereby avoid influencing the performance of motor 3.

As shown in fig. 4, the water sealing structure 6 further includes a framework 63, and the framework 63 is embedded in the elastic layer 61. The framework 63 is made of hard materials, and provides support for the elastic layer 61, so that the overall strength of the water seal structure 6 can be improved, and the phenomenon that the elastic layer 61 is inclined to cause the reduction of the sealing effect is avoided. In order to improve the supporting effect of the framework 63 on the elastic layer 61, the shape of the framework 63 is matched with the shape of the elastic layer 61, so that a certain supporting force is provided for each position of the elastic layer 61, and the sealing effect is prevented from being influenced by excessive deformation of the elastic layer 61.

Alternatively, the skeleton 63 may be made of a steel plate so as to have sufficient strength. It will be appreciated that the thickness of the skeleton 63 may be set according to the size of the bearing 32. When the size of the bearing 32 is large, the shaft diameter of the output shaft 31 and the overall size of the motor 3 are correspondingly large, the pressing force applied by the pressing member 5 to the elastic layer 61 is increased, and the contact area is large. In order to ensure sufficient strength of the water seal structure 6, the thickness of the framework 63 may be increased accordingly. In this embodiment, the thickness of the frame 63 is 0.4 mm.

Further, the thickness of the elastic layer 61 positioned above the skeleton 63 in the second shaft section 612 is greater than the thickness of the elastic layer 61 positioned below the skeleton 63. The thickness of the elastic layer 61 positioned above the skeleton 63 in the second shaft section 612 is large, and the elastic contact effect between the elastic layer 61 and the pressing piece 5 can be improved, thereby improving the sealing effect. The thickness of the elastic layer 61 of the second shaft section 612 below the framework 63 is small, so that the water seal structure 6 can be ensured to be fixed relative to the bearing chamber 33 when being abutted by the pressing member 5, the water seal structure 6 is prevented from being inclined, the coaxial state of the water seal structure 6 and the output shaft 31 of the motor 3 is favorably maintained, and the sealing effect of the water seal structure 6 and the output shaft 31 is prevented from being reduced.

Preferably, the thickness of the elastic layer 61 above the skeleton 63 in the second shaft section 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 section 612 is 0.5-1 times the thickness of the skeleton 63.

In order to further improve the waterproof effect, the elastic layer 61 further includes an upper lip 6111, the upper lip 6111 is connected with the inner side edge of the main body and is arranged around the circumference of the main body, and a cavity is defined by the upper lip 6111, the inner side of the main body and the backing plate 62 and used for storing lubricating grease 64. The grease 64 forms an oil layer on the output shaft 31 to increase the sealing property, and at the same time, provides lubrication to the pad plate 62, and can further reduce the frictional force between the pad plate 62 and the output shaft 31, thereby avoiding affecting the efficiency of the motor 3.

In addition, the upper lip 6111 is in clearance fit with the output shaft 31, and the clearance can prevent partial particles from entering the water seal structure 6, and can prevent the grease 64 from overflowing and losing. In this embodiment, the gap between the upper lip 6111 and the output shaft 31 is about 0.1mm, which can effectively prevent particles above 0.1mm from entering the water seal structure 6.

Further, the upper lip 6111 extends obliquely upward from the main body in a direction close to the output shaft 31, that is, the upper lip 6111 has a raised structure. The volume of the cavity can be increased by providing the upper lip 6111 in a raised configuration, thereby injecting enough grease 64; in addition, the upper lip 6111 has a certain function of blocking impurities for the upwarping structure, and the impurities can move in the direction far away from the output shaft 31 under the guiding function of the outer side wall of the upper lip 6111, so that the impurities can be prevented from entering the water seal structure 6 through a gap between the upper lip 6111 and the output shaft 31.

Alternatively, the amount of grease 64 injected into the cavity may be 60% to 80% of the cavity volume, and within this range, grease 64 may ensure that grease 64 is sufficient for use and that excessive spillage of grease 64 and waste of grease 64 may be avoided.

Since the liquid sucked by the wet and dry vacuum cleaner may have acid-base properties, in order to ensure that the grease 64 is not damaged by the liquid having acid-base properties, in the embodiment, the grease 64 is kruenbo 71 grease.

In this embodiment, the water seal structure 6 forms a triple seal. The first heavy seal is realized by a gap between the upper lip edge 6111 and the output shaft 31, so that part of particulate matters can be prevented from entering the water seal structure 6; the second resealing is achieved by grease 64, the grease 64 being capable of forming an oil layer on the output shaft 31 to increase the sealing performance; the third tertiary seal is achieved by an interference fit between the backing plate 62 and the output shaft 31. Through the triple seal, the waterproof performance of the motor component for the dust collector can be improved, the structural damage of the inner bearing 32 and the like of the motor 3 is avoided, and the service life of the motor component for the dust collector is prolonged.

In order to avoid interference between the upper lip 6111 and the movable impeller 4, the top end of the upper lip 6111 is not higher than the top surface of the pressing member 5, so that a certain safety distance is formed between the upper lip 6111 and the movable impeller 4, the upper lip 6111 is prevented from contacting with the movable impeller 4, abrasion of the upper lip 6111 is avoided, and resistance on the movable impeller 4 is reduced. Optionally, the minimum distance between the upper lip 6111 and the impeller 4 is 1.5mm-2.5 mm.

To improve the sealing effect between the pressing member 5 and the elastic layer 61, as shown in fig. 4 and 5, the top surface of the second shaft section 612 is provided with an annular rib 6121 abutting against the pressing member 5. After the pressing piece 5 is fixed with the motor 3, the pressing piece 5 is firstly abutted against the annular rib 6121, the annular rib 6121 deforms under stress to block a gap between the pressing piece 5, and the sealing effect is improved.

Further, the width of the cross section of the top of the annular rib 6121 is gradually reduced from bottom to top, so that the top of the annular rib 6121 is a tip, and the tip is more easily flattened when being stressed, which is beneficial to improving the sealing effect. For example, the cross section of the annular rib 6121 may be triangular, and the vertex of the triangle is disposed upward.

Because the elastic layer 61 can deform around when the annular rib 6121 is pressed, to provide a deformation space for the elastic layer 61, the elastic layer 61 is further provided with an annular groove 6122, the annular groove 6122 is located on one side of the annular rib 6121 close to the output shaft 31, that is, the annular groove 6122 is located on the inner side of the annular rib 6121. Through setting up annular groove 6122 can provide the deformation space for the material of elastic layer 61 when annular rib 6121 is pressed, help elastic layer 61 to warp smoothly under the pressure effect of pressing piece 5 to improve sealed effect.

Further, the outer edge of the top surface of the elastic layer 61 is provided with a notch 6123, and the notch 6123 can provide a space for the elastic material to deform outwards, so that the elastic layer 61 is smoothly extruded. When the second shaft section 612 is deformed by the extrusion force of the pressing piece 5, the elastic layer 61 at the second shaft section 612 deforms into the notch 6123, so that the elastic material fills the notch 6123 and contacts with the vertex angle position of the large-diameter hole 5112, and the elastic layer 61 at the second shaft section 612 can be better attached to the inner wall of the large-diameter hole 5112 on the basis of not influencing the deformation of the elastic layer 61, thereby being beneficial to improving the sealing effect.

In this embodiment, the annular groove 6122 and the notch 6123 are both disposed at the upper portion of the second shaft section 612, so that the annular groove 6122 and the notch 6123 are disposed near the annular rib 6121. Annular rib 6121 is located the atress position of pressing piece 5 contact, through being close to the atress position setting with annular groove 6122 and breach 6123, can provide the deformation space for elastic material better.

As shown in fig. 6, in the present embodiment, a fluid passage is formed between the pressing piece 5 and the lower casing 2, and the fluid passage communicates with a fluid inlet on the upper casing 1. In order to further improve the waterproof performance of the motor 3, a cavity for installing the motor 3 is defined between the pressing piece 5 and the lower housing 2, and the cavity is separated from the fluid channel, so that fluid is prevented from entering the cavity.

Specifically, the lower casing 2 includes a first annular stopper rib 21 and a lower flow passage 22 surrounding the outside of the first annular stopper rib 21. The pressing piece 5 comprises a cover plate 51, a second annular limiting rib 52 arranged on the bottom surface of the cover plate 51 and an upper flow channel 50 located on the outer side of the second annular limiting rib 52, the upper flow channel 50 and the lower flow channel 22 are spliced to form a fluid channel, and the first annular limiting rib 21 and the second annular limiting rib 52 are abutted and sealed to form a cavity for mounting the motor 3. Through the sealed butt joint of first annular spacing muscle 21 and second annular spacing muscle 52, can separate fluid passage and cavity, avoid the fluid in the fluid passage to get into in the cavity.

As shown in fig. 7, a sealing ring groove 211 is formed in the top of the first annular limiting rib 21, a sealing ring 7 is arranged in the sealing ring groove 211, the bottom end of the second annular limiting rib 52 abuts against the sealing ring 7, and the sealing ring 7 is pressed in the sealing ring groove 211, so that the first annular limiting rib 21 and the second annular limiting rib 52 are connected in a sealing manner.

Further, the bottom surface of the packing groove 211 is also provided with a sealing rib 2111. When the second annular limiting rib 52 is abutted against the sealing ring 7 downwards, the sealing ring 7 can be pressed on the sealing convex edge 2111, the sealing ring 7 deforms and is completely attached to the surface of the sealing convex edge 2111, the deformation of the sealing ring 7 can be increased, and the sealing effect is improved.

Alternatively, at least two sealing ribs 2111 may be provided, and at least two sealing ribs 2111 are provided at intervals and respectively abut against the sealing ring 7, so that the sealing effect can be further improved.

Alternatively, the cross-sectional width of the sealing rib 2111 gradually decreases from bottom to top. The sealing convex edge 2111 in the shape is abutted to the sealing ring 7, so that the sealing ring 7 is easier to deform, and the joint effect of the sealing ring 7 and the sealing convex edge 2111 is improved, so that the sealing effect is improved.

In some embodiments, the sealing rib 2111 is provided on the second annular bead 52, the sealing rib 2111 is provided on two opposite sides of the second annular bead 52, and the sealing rib 2111 abuts against the sealing ring 7 from the upper side, so that the sealing effect can be improved.

In this embodiment, the pressing member 5 can be used as a stationary impeller, and the pressing member 5 can apply forced air and wind guide effects in accordance with the movable impeller 4. As shown in fig. 8, the pressing member 5 further includes a first vane wheel 53 and a second vane wheel 54, the first vane wheel 53 and the second vane wheel 54 are coaxially disposed and connected, the first vane wheel 53 and the second vane wheel 54 are disposed around the cover plate 51, and the first vane wheel and the second vane wheel form the upper flow channel 50. The provision of the first vane wheel 53 and the second vane wheel 54 enables the direction of fluid flow to be directed, which is advantageous in improving the efficiency of the motor assembly for the cleaner.

As shown in fig. 9 and 10, the first vane wheel 53 includes a first annular inner rib 532 and a first annular outer rib 531 which are arranged at an interval, the first annular outer rib 531 is sleeved outside the first annular inner rib 532, and a plurality of first vanes 533 are arranged between the first annular inner rib 532 and the first annular outer rib 531. When the motor assembly for a vacuum cleaner 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 guiding action of the first vane 533, so that the fluid flows according to a preset track.

When the motor assembly for a vacuum cleaner 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 guiding action of the first vane 533, so that the fluid flows according to a preset track.

The second vane wheel 54 is similar in construction to the first vane wheel 53. Muscle 542 and the outer muscle 541 of second annular in the second impeller 54 includes spaced second annular, and the outside of muscle 542 is established in the muscle 541 cover in the second annular outside the second annular, is provided with a plurality of second blades 543 in the second annular between muscle 542 and the outer muscle 541 of second annular. The second annular inner rib 542 is located directly below the first annular inner rib 532 and abuts against the first annular inner rib, and the second annular outer rib 541 is located directly below the first annular outer rib 531 and abuts against the first annular inner rib, so that the fluid passing between the first vane wheels 53 can smoothly enter the second vane wheel 54.

In this embodiment, the first vane wheel 53 and the second vane wheel 54 are engaged with each other, so that the fluid can be guided more efficiently, which is advantageous for improving the efficiency of the motor assembly for the vacuum cleaner.

Alternatively, the first vane wheel 53 and the second vane wheel 54 may be connected by screws to facilitate disassembly and assembly, so that the number of vane wheels to be used may be selected as needed, and the first vane wheel 53 and the second vane wheel 54 may be replaced conveniently.

In some embodiments, the pressing member 5 may be provided with only the first vane wheel 53 to simplify the structure of the pressing member 5.

In this embodiment, the first vane wheel 53, the cover plate 51 and the second annular limiting rib 52 are integrally formed, so that the fixing effect of the first vane wheel, the cover plate 51 and the second annular limiting rib can be improved, an additional fastener is avoided, the number of parts of the pressing piece 5 is reduced, and the disassembly and the assembly are convenient.

In this embodiment, a protruding fastening 534 is further disposed on the outer wall of the first vane wheel 53, and a buckle is disposed on the upper housing 1, and the buckle can be engaged with the protruding fastening 534 to fix the pressing member 5 and the upper housing 1, thereby improving the stability of the motor assembly structure of the vacuum cleaner.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (26)

1. A motor assembly for a vacuum cleaner, comprising:

the motor (3), the motor (3) includes a bearing chamber (33), a bearing (32) and an output shaft (31), the bearing chamber (33) is provided with a through hole, the bearing (32) is arranged in the bearing chamber (33), and the output shaft (31) penetrates through the bearing (32) and penetrates through the through hole;

the water seal structure (6) is sleeved outside the output shaft (31) and shields the through hole, and the water seal structure (6) is in interference fit with the output shaft (31) and can rotate relative to the output shaft (31);

the pressing piece (5) is detachably connected with the motor (3) and sleeved outside the output shaft (31), and the water seal structure (6) is abutted to the bearing chamber (33) by the pressing piece (5).

2. The motor assembly for vacuum cleaner according to claim 1, characterized in that said water seal structure (6) comprises:

the elastic layer (61) is sleeved outside the output shaft (31) and arranged in a clearance mode with the output shaft (31), and the elastic layer (61) is abutted to the bearing chamber (33) by the pressing piece (5);

backing plate (62), with elastic layer (61) are connected and the cover is located outside output shaft (31), backing plate (62) with output shaft (31) interference fit and can be relative output shaft (31) rotate.

3. The motor assembly for a vacuum cleaner according to claim 2, wherein the pad (62) is made of polytetrafluoroethylene.

4. The motor assembly for a vacuum cleaner according to claim 2, wherein the backing plate (62) is annular, and an inner side edge of the backing plate (62) is provided with an upwardly extending abutment flange (621), the abutment flange (621) being in interference fit with the output shaft (31).

5. The motor assembly for a vacuum cleaner according to claim 2, wherein the interference of the pad plate (62) with the output shaft (31) is 0.05mm-0.2 mm.

6. The motor assembly for a vacuum cleaner according to claim 2, wherein a contact length of the pad plate (62) with the output shaft (31) in an axial direction of the output shaft (31) is 0.5mm to 2 mm.

7. The motor assembly for a vacuum cleaner according to claim 2, wherein the elastic layer (61) comprises an annular main body and an upper lip (6111) connected to the main body, the upper lip (6111) is arranged around the top edge of the inner wall of the main body, and the upper lip (6111), the main body and the backing plate (62) enclose a cavity for storing grease (64).

8. The motor assembly for a vacuum cleaner according to claim 7, wherein the upper lip (6111) extends obliquely upward from the main body in a direction approaching the output shaft (31).

9. The motor assembly for vacuum cleaner according to claim 7, characterized in that the top end of the upper lip (6111) is not higher than the top surface of the presser (5).

10. The motor assembly for a vacuum cleaner according to claim 2, wherein the elastic layer (61) comprises an annular main body and a lower lip (6112) connected to the main body, the lower lip (6112) is disposed along a circumference of an inner side of the main body, and an outer edge of the backing plate (62) is disposed between the lower lip (6112) and the main body.

11. The motor assembly for a vacuum cleaner according to claim 10, wherein a dimension of the lower lip (6112) in a radial direction of the output shaft (31) is not less than 1/3 of a dimension of the backing plate (62) in a radial direction of the output shaft (31);

the thickness of the lower lip (6112) is 1-1.5 times of the thickness of the backing plate (62).

12. The motor assembly for a vacuum cleaner according to claim 2, wherein said pad (62) is vulcanized with said elastic layer (61).

13. The motor assembly for vacuum cleaner according to claim 2, characterized in that said water seal structure (6) further comprises a skeleton (63), said skeleton (63) being embedded in said elastic layer (61).

14. The motor assembly for a vacuum cleaner according to claim 13, wherein 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, the large diameter hole (5112) is located at a side of the small diameter hole (5111) close to the bearing chamber (33), and the bearing chamber (33) is located in the large diameter hole (5112);

the elastic layer (61) includes a first shaft section (611) and a second shaft section (612), an outer diameter of the first shaft section (611) is smaller than an outer diameter of the second shaft section (612), the first shaft section (611) is disposed in the small-diameter hole (5111), and the second shaft section (612) is disposed in the large-diameter hole (5112) and abuts against the bearing chamber (33) and the pressing member (5), respectively.

15. The motor assembly for a vacuum cleaner according to claim 14, wherein the thickness of the elastic layer (61) in the second shaft section (612) above the bobbin (63) is greater than the thickness of the elastic layer (61) below the bobbin (63).

16. The motor assembly for a vacuum cleaner according to claim 14, wherein the thickness of the elastic layer (61) in the second shaft section (612) above the bobbin (63) is 1.5-2 times the thickness of the pad plate (62);

the thickness of the elastic layer (61) in the second shaft section (612) below the framework (63) is 0.5-1 times of the thickness of the cushion plate (62).

17. The motor assembly for a vacuum cleaner according to claim 14, wherein an outer diameter of the second shaft section (612) is smaller than an inner diameter of the large-diameter hole (5112), and the second shaft section (612) is capable of interference-fitting with the large-diameter hole (5112) when pressed by an external force.

18. The motor assembly for vacuum cleaner according to claim 17, characterized in that the top surface of the second shaft section (612) is provided with an annular rib (6121) abutting the presser (5).

19. The motor assembly for a vacuum cleaner as claimed in claim 18, wherein a cross-sectional width of a top portion of the annular rib (6121) is gradually reduced from bottom to top.

20. The motor assembly for vacuum cleaner according to claim 18, wherein said elastic layer (61) is provided with an annular groove (6122), and said annular groove (6122) is located on one side of said annular rib (6121) close to said output shaft (31).

21. The motor assembly for a vacuum cleaner according to claim 18, wherein the outer top edge of the elastic layer (61) is provided with a notch (6123).

22. The motor assembly for a vacuum cleaner according to any one of claims 1 to 21, characterized in that the motor component for the dust collector also comprises a cover shell, the cover shell comprises a first annular limiting rib (21) and a lower runner (22) arranged at the outer side of the first annular limiting rib (21), the pressing piece (5) comprises a cover plate (51), a second annular limiting rib (52) arranged on the bottom surface of the cover plate (51) and an upper flow passage (50) positioned on the outer side of the second annular limiting rib (52), the upper flow passage (50) is arranged opposite to and connected with the lower flow passage (22), the first annular limiting rib (21) is in sealing and abutting joint with the second annular limiting rib (52), the first annular limiting rib (21), the cover plate (51) and the second annular limiting rib (52) enclose a cavity for accommodating the motor (3).

23. The motor assembly for a vacuum cleaner according to claim 22, wherein the pressing member (5) further comprises a blade wheel, the blade wheel comprises 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 passage (50) therebetween, and the annular inner rib is sleeved outside the cover plate (51) and connected with the cover plate (51).

24. The motor assembly for a vacuum cleaner according to claim 22, wherein either one of the top end of the first annular stopper rib (21) and the bottom end of the second annular stopper rib (52) is provided with a seal ring groove (211), a seal ring (7) is provided in the seal ring groove (211), and the seal ring (7) is clamped between the first annular stopper rib (21) and the second annular stopper rib (52).

25. The motor assembly for a vacuum cleaner according to claim 24, wherein a bottom surface of the sealing ring groove (211) is provided with a sealing rib (2111).

26. The motor assembly for a vacuum cleaner according to claim 25, wherein the sealing rib (2111) has a cross-sectional width gradually decreasing from bottom to top.

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