A roller assembly and a garment handling device

Abstract

This invention discloses a roller assembly and a garment processing device, comprising a roller, with smooth areas and patterned areas arranged circumferentially along the roller wall. The smooth areas are provided with drain outlets, and the patterned areas have multiple patterns arranged therein, forming a flow channel between adjacent patterns to guide water from inside the roller to the smooth areas. Through this arrangement, when draining water from the roller, the water flow is guided by the patterns on the roller to flow towards the smooth areas, ensuring that the water inside the roller converges and flows to the drain outlet located in the smooth area, thus ensuring smooth drainage of the water inside the roller. Furthermore, this invention has a simple structure, significant effects, and is suitable for widespread use.

Description

Technical Field

[0001] This invention relates to a garment handling device for household appliances, and more specifically, to a drum structure without a normally open hole for use in the aforementioned garment handling device. Background Technology

[0002] With the improvement of people's living standards, washing machines and washer-dryer combos with drying functions have gradually entered most households. Existing clothing handling devices can be broadly categorized into top-loading, agitator, and front-loading washing machines. Generally speaking, all clothing handling devices have a washing function, removing stains from clothes through the action of water and detergent.

[0003] Top-loading washing machines typically wash clothes by rotating a pulsator in the center of the tub. Agitator washing machines typically wash clothes by rotating agitator vanes in the center of the tub, using the friction between the water and the clothes. Front-loading washing machines typically wash clothes by tumbling the clothes with a rotating drum.

[0004] In existing drum washing machines, there is generally a shell, inside which is installed an outer drum for holding washing water. Inside the outer drum is a drum for holding laundry, and on the back of the outer drum is a motor and shaft for driving the drum to rotate.

[0005] Currently, whether it is a top-loading or front-loading washing machine, a large amount of dirt generally remains between the inner and outer drums. In order to avoid contaminating the washing water, the applicant previously proposed a holeless front-loading washing machine that combines the inner and outer drums into one, in order to overcome the problem of dirt remaining between the inner and outer drums.

[0006] However, in the aforementioned holeless drum washing machine, the drum directly forms a sealed water container during the washing cycle. During the draining cycle, the valve at the drain outlet on the drum is opened by a driving force and needs to drain water quickly. In particular, when the driving force on the valve is the centrifugal force of the drum's rotation, the drum needs to rotate around its axis while simultaneously draining water. Existing drum structures cannot achieve this, resulting in poor drainage from the clothes handling unit, low drainage rate, and even water residue remaining inside the drum after the clothes handling unit has finished draining.

[0007] In view of this, the present invention is hereby proposed. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a roller structure to improve the drainage smoothness of the non-porous roller; at the same time, the present invention also provides a garment processing device to utilize the above-mentioned roller structure to achieve smooth drainage of the non-porous roller.

[0009] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0010] A roller assembly includes a roller, the roller wall having smooth areas and pressed areas arranged circumferentially, the smooth areas having drain outlets, and the pressed areas having multiple pressed patterns arranged thereon, with a flow channel formed between adjacent pressed patterns to guide water in the roller to the smooth areas.

[0011] Furthermore, the forming area is provided with multiple parallel forming lines arranged at intervals along the circumferential direction of the roller, with the ends of the forming lines facing the adjacent smooth areas; preferably, a drain outlet is provided in the middle of the smooth area of ​​the roller, and the ends of the forming lines are facing the drain outlet in the middle of the smooth area.

[0012] Furthermore, the forming area includes multiple parallel front forming lines extending from the cylinder opening towards the cylinder split surface, and multiple parallel rear forming lines extending from the cylinder bottom towards the cylinder split surface; each front forming line and each rear forming line are set in a one-to-one correspondence with the cylinder split surface, so that the corresponding group of front forming lines and rear forming lines together constitute a "V" shape.

[0013] Preferably, the dividing surface of the roller is a vertical surface that is perpendicular to the roller axis and is equidistant from the roller opening and the roller bottom.

[0014] Furthermore, each front pressing type extends along an oblique line that gradually slopes towards the smooth area from the cylinder opening towards the cylinder split surface; each rear pressing type extends along an oblique line that gradually slopes towards the smooth area from the cylinder bottom towards the cylinder split surface.

[0015] Preferably, the angle between each front pressing type and the roller axis is the same value, and the angle between each rear pressing type and the roller axis is the same value;

[0016] In a further preferred embodiment, the included angles between each front pressing type and each rear pressing type and the roller axis are all the same value.

[0017] Furthermore, each front pressure type and each rear pressure type extends along the cylindrical helix of the drum wall. The lead of the cylindrical helix extended by the front pressure type and the rear pressure type is the same, and the diameter of the cylindrical surface is equal. The rotation direction of the cylindrical helix extended by the front pressure type and the rear pressure type is opposite.

[0018] Preferably, the end of each front pressing type located at the cylinder opening is farther away from the smooth area than the end closest to the cylinder's split surface, and the end of each rear pressing type located at the cylinder bottom is farther away from the smooth area than the end closest to the cylinder's split surface.

[0019] Furthermore, among the front pressing molds provided in the pressing area, the extension length of the front pressing mold closer to the smooth area is less than the extension length of the front pressing mold farther from the smooth area; among the rear pressing molds provided in the pressing area, the extension length of the rear pressing mold closer to the smooth area is less than the extension length of the rear pressing mold farther from the smooth area.

[0020] Preferably, the front and rear moldings in the molding area are set to be of equal length and are opposite to each other.

[0021] Furthermore, the forming area is divided into a first area and a second area along the circumferential direction of the roller, which are close to the left side of the smooth area. The first area and the second area are respectively distributed with a first group of forming molds and a second group of forming molds. The first group of forming molds and the second group of forming molds are symmetrically arranged with respect to the center line of the forming area. The center line of the forming area is parallel to the roller axis and is equidistant from the opposite sides of the forming area in the circumferential direction of the roller.

[0022] Preferably, multiple smooth areas and multiple forming areas are alternately arranged on the drum wall along the circumferential direction of the drum. Each forming area is provided with a first set of forming and a second set of forming to guide water flow to the smooth areas on different adjacent sides.

[0023] Furthermore, the smooth area is equipped with lifting ribs that protrude into the drum. The lifting ribs are fastened to the inner side of the drum wall and correspondingly block the drain outlet. The inside of the lifting ribs is hollow. The hollow part of the lifting ribs is equipped with a valve body structure corresponding to the opening and closing of the drain outlet. The hollow part of the lifting ribs is connected to the inside of the drum through the through holes provided on the lifting ribs and / or the gap between the lifting ribs and the drum wall.

[0024] Furthermore, the forming area is provided with a protrusion that bulges into the inside of the roller, and the distance between the forming and the roller axis is less than or equal to the distance between the drain outlet and the roller axis.

[0025] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0026] With the above settings, when the drum is drained, the drainage water flow can be guided by the molding on the drum to flow towards the smooth area, ensuring that the water in the drum converges and flows to the drain outlet located in the smooth area of ​​the drum, so that the water in the drum can be smoothly drained out through the drain outlet. At the same time, since the drain outlet is located in the smooth area of ​​the drum, the distance between the drain outlet and the drum axis is greater than or equal to that of other areas of the drum, especially the molding area, so as to ensure that all the washing water in the drum can be drained out, avoiding problems such as water accumulation and residue in the drum.

[0027] The present invention also discloses a garment processing device, which includes any of the above-described roller assemblies installed within a housing.

[0028] At the same time, the present invention has a simple structure, significant effects, and is suitable for widespread use.

[0029] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0031] Figure 1 This is a front view schematic diagram of the roller structure in an embodiment of the present invention;

[0032] Figure 2 This is an embodiment of the present invention. Figure 1 A schematic diagram of the AA section;

[0033] Figure 3 This is a partial structural diagram of the roller in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the roller in an embodiment of the present invention.

[0035] The main components in the diagram are: 1. Roller; 2. Cylinder wall; 3. Forming; 4. Lifting ribs; 5. Smooth area; 6. Forming area; 7. Cylinder opening; 8. Cylinder bottom; 31. Front forming; 32. Rear forming; 33. First group of forming; 34. Second group of forming.

[0036] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 this invention.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] like Figures 1 to 4 As shown in the embodiment of the present invention, a roller assembly is introduced, which includes a roller 1, a roller wall 2 with a smooth area 5 and a molding area 6 arranged circumferentially, the smooth area 5 is provided with a drain outlet, and the molding area 6 is arranged with a plurality of moldings 3 with concave and convex variations, and a flow channel is formed between adjacent moldings 3, the flow channel being used to guide water in the roller 1 to the smooth area 5.

[0041] With the above settings, when the drum is drained, the drainage water flow can be guided by the molding on the drum to flow towards the smooth area, ensuring that the water in the drum converges and flows to the drain outlet located in the smooth area of ​​the drum, so that the water in the drum can be smoothly drained out through the drain outlet. At the same time, since the drain outlet is located in the smooth area of ​​the drum, the distance between the drain outlet and the drum axis is greater than or equal to that of other areas of the drum, especially the molding area, so as to ensure that all the washing water in the drum can be drained out, avoiding problems such as water accumulation and residue in the drum.

[0042] In this embodiment of the invention, the smooth region 5 is a smooth cylindrical surface on the roller wall 2 that does not have any unevenness.

[0043] like Figures 2 to 4 As shown in the embodiment of the present invention, the forming area 6 is provided with a plurality of parallel forming molds 3 arranged at intervals along the circumferential direction of the roller 1, and the ends of the forming molds 3 are arranged toward the adjacent smooth area 5; preferably, the smooth area 5 of the roller is provided with a drain outlet in the middle, and the ends of the forming molds 3 are arranged toward the drain outlet in the middle of the smooth area 5.

[0044] like Figures 2 to 4As shown in the embodiment of the present invention, the molding area 6 includes multiple parallel front moldings 31 extending from the cylinder opening 7 towards the center plane of the cylinder 1, and multiple parallel rear moldings 32 extending from the cylinder bottom 8 towards the center plane of the cylinder 1. Each front molding 31 and each rear molding 32 is arranged in a one-to-one correspondence with the center plane dd of the cylinder 1, so that the corresponding group of front moldings 31 and rear moldings 32 are arranged in a "V" shape, thereby guiding the water in the cylinder 1 to converge and flow towards the center of the smooth area 5, and smoothly drain out through the drain outlet.

[0045] Preferably, in this embodiment of the invention, each front pressure type 31 and each rear pressure type 32 are arranged at equal intervals along the circumferential direction of the roller 1. The intervals between adjacent front pressure types 31 and adjacent rear pressure types 32 form a flow channel, which allows water in the roller 1 to converge and flow along the flow channel toward the drain outlet in the middle of the smooth area 5.

[0046] like Figure 2 As shown, in this embodiment of the invention, the roller 1 has a split surface dd, which is a vertical surface perpendicular to the axis of the roller 1 and equidistant from the roller opening and the roller bottom. The front moldings 31 and rear moldings 32 of the molding area 6 are symmetrically arranged opposite to the split surface dd of the roller, so that the water inside the roller 1, guided by the front and rear moldings 3, flows towards the drain outlet in the center of the molding area 6, thereby accelerating the discharge of water from the roller 1 after the drain outlet opens.

[0047] like Figures 2 to 4 As shown in the embodiment of the invention, each front pressing type 31 extends along an oblique line gradually inclined towards the smooth area 5 from the roller opening 7 toward the roller split surface dd; preferably, the angle between each front pressing type 31 and the parallel line cc of the roller axis is the same inclination angle. Similarly, each rear pressing type 32 extends along an oblique line gradually inclined towards the smooth area 5 from the roller bottom 8 toward the roller split surface dd; preferably, the angle between each rear pressing type 32 and the parallel line cc of the roller axis is the same inclination angle. More preferably, the angle between each front pressing type 31 and each rear pressing type 32 and the parallel line cc of the roller axis is the same inclination angle α, so that the front and rear pressing types 31 and 32 can be symmetrically arranged opposite each other to the roller split surface dd.

[0048] Alternatively, in this embodiment of the invention, each front pressure type 31 and each rear pressure type 32 extends along the cylindrical spiral line of the drum 1 wall. The lead of the cylindrical spiral lines extended by the front pressure type 31 and the rear pressure type 32 is the same, and the diameter of the cylindrical surface is equal. At the same time, the spiral lines extended by the front pressure type 31 and the rear pressure type 32 are arranged in opposite directions. It is necessary to ensure that the end of the front pressure type at the drum opening 7 is far away from the smooth area 5 relative to the end of the drum's split surface dd, and the end of the rear pressure type 32 at the drum bottom 8 is far away from the smooth area 5 relative to the end of the drum's split surface dd. This allows the front and rear pressure types to be symmetrically arranged relative to the drum's split surface dd, which can also promote the water in the drum 1 to converge and flow towards the center of the smooth area 5.

[0049] like Figures 2 to 4 As shown in the embodiment of the invention, the extension lengths of the molding patterns in the molding region 6 are not equal. Preferably, among the front molding patterns 31 in the molding region 6, the extension length of the front molding pattern 31 closer to the smooth region 5 is less than the extension length of the front molding pattern 31 farther from the smooth region 5; among the rear molding patterns 32 in the molding region 6, the extension length of the rear molding pattern 32 closer to the smooth region 5 is less than the extension length of the rear molding pattern 32 farther from the smooth region 5. Simultaneously, the front molding patterns 31 and rear molding patterns 32 in the molding region 6 are arranged with equal lengths, so that the midpoints (dd) of the front molding patterns 31 and rear molding patterns 32 relative to the roller are symmetrically arranged.

[0050] like Figure 2 As shown in the embodiment of the present invention, the forming area 6 is divided into a first area and a second area near the left side of the smooth area 5 along the circumferential direction of the roller. The first area and the second area are respectively distributed with a first group of forming molds 33 and a second group of forming molds 34. The first group of forming molds 33 and the second group of forming molds 34 are symmetrically arranged with respect to the center line of the forming area 6. The center line of the forming area 6 is parallel to the axis of the roller and is equidistant from the opposite sides of the forming area 6 in the circumferential direction of the roller 1.

[0051] In this embodiment of the invention, the first set of pressing molds 33 and the second set of pressing molds respectively include a front pressing mold 31 and a rear pressing mold 32 that converge and tilt from both ends toward the center and toward the drain outlet, so as to draw water in the roller from both sides toward the drain outlet in the center of the smooth area.

[0052] In this embodiment of the invention, the front pressing mold 31 included in the first pressing mold 33 and the front pressing mold 31 included in the second pressing mold 34 are arranged in opposite directions relative to the axis of the roller 1; similarly, the rear pressing mold 32 included in the first pressing mold 33 and the rear pressing mold 32 included in the second pressing mold 34 are also arranged in opposite directions relative to the axis of the roller 1.

[0053] In this embodiment of the invention, multiple smooth regions 5 and multiple molding regions 6 can be alternately arranged on the drum wall 2 along the circumferential direction of the drum. Each molding region 6 is provided with a first set of moldings 33 and a second set of moldings 34 that guide water flow to the smooth regions 5 on different adjacent sides.

[0054] In this embodiment of the invention, the first group of molding 33 and the second group of molding 34 in the same molding area 6 are arranged symmetrically with respect to the center line of the molding area 6. The center line of the molding area 6 is parallel to the axis of the roller 1 and is located at the center of the molding area 6 in the circumferential direction of the roller.

[0055] like Figures 2 to 4 As shown in the embodiment of the invention, a lifting rib 4 protruding into the drum is installed in the smooth area 5. The lifting rib 4 is fastened to the inner side of the drum wall 2 and correspondingly blocks the drain port. The inside of the lifting rib 4 is hollow. A valve body structure corresponding to opening and closing the drain port is installed in the hollow part of the lifting rib 4. The hollow part of the lifting rib 4 is connected to the inside of the drum 1 through the through hole provided on the lifting rib and / or the gap between the lifting rib 4 and the drum wall 2, so that after the valve body structure opens the drain valve, the water in the drum 1 flows into the hollow part of the lifting rib 4 through the through hole and / or the gap and then is discharged from the drum 1 through the drain port, thereby realizing the effect of water in the drum 1 being discharged outward from the drain port. At the same time, due to the above-mentioned pressure mold 3 structure provided on the drum 1, the water in the drum 1 will converge towards the lifting rib 4 under the guidance of the pressure mold 3, so as to ensure the smooth discharge of water and avoid water residue in the drum 1 after drainage.

[0056] Preferably, in this embodiment of the invention, the lifting rib 4 is a strip-shaped lifting rib 4 extending parallel to the axis of the roller 1. Multiple through holes are arranged on the surface of the lifting rib 4, each connecting the roller 1 to the hollow cavity inside the lifting rib 4. Simultaneously, the two sides of the lifting rib 4 along the circumference of the roller 1 are the left and right sides, respectively. Gaps are provided at the contact points between the left and right sides and the roller wall 2. These gaps also connect the roller 1 to the hollow cavity inside the lifting rib 4. To prevent lint from being discharged with the water flow, lint filtering devices such as comb structures and filter screens can be installed at these gaps. Furthermore, to ensure smooth drainage, the end of each mold 3 near the smooth area 5, close to the dividing surface dd of the roller 1, is positioned at the end of the strip-shaped lifting rib 4. This ensures that the water guided by the mold 3 converges and flows towards the center of the strip-shaped lifting rib 4, thereby improving the drainage efficiency of the roller 1.

[0057] Meanwhile, in this embodiment of the invention, the valve body structure for controllable opening and closing of the drain outlet can adopt any structure in the prior art, such as a centrifugal drain valve that uses the rotation of a roller to reach a set value and then uses the centrifugal force of rotation to pull the valve plug to open the drain outlet.

[0058] like Figure 4As shown in the embodiment of the invention, the molding 3 in the molding area 6 is a protrusion protruding from the cylinder wall 2 into the cylinder 1. The distance between the protrusion and the axis of the cylinder 1 is less than or equal to the distance between the drain outlet and the axis of the cylinder 1, so that the drain outlet is located at the maximum diameter of the cylinder 1. When the cylinder 1 rotates, the water in the cylinder 1 is thrown outward by centrifugal force and flows along the flow channel formed by the molding to the drain outlet of the farthest cylinder 1, effectively preventing the problem of water remaining in the cylinder after the cylinder 1 drains. Preferably, in order to further improve the smoothness of drainage, the molding area 6 and the smooth area 5 can be set in different cylindrical surfaces of different diameters, so that the distance between the molding area 6 and the axis of the cylinder is less than the distance between the smooth area and the axis of the cylinder, and the two are connected through the curved surface, so that the water flow in the molding area can flow through the curved surface to the smooth area after being driven by centrifugal force, further improving the smoothness of water drainage from the cylinder.

[0059] This invention also introduces a clothing processing device, which includes the drum structure described above. The drum 1 is connected to a drive motor via a rotating shaft. The drive motor drives the drum 1 to rotate around the shaft, so as to achieve the effect of agitating and washing the water and clothes contained in the drum 1.

[0060] Preferably, in this embodiment of the invention, when the garment processing device is washing clothes, the drain outlet of the drum 1 is closed by the valve body structure to form an independent sealed container for holding the washing water. This avoids the washing water from flowing cross-flowing inside and outside the drum 1 during the washing process, which would cause the washing water to be contaminated by dirt and bacteria accumulated outside the drum 1, thereby improving the user's quality of life.

[0061] In this embodiment of the invention, in order to ensure that the roller 1 is rotatably mounted in the housing of the garment processing device, the following settings can be made:

[0062] The laundry handling unit includes a housing, within which is an outer drum. The outer drum is connected to the washing machine housing via shock-absorbing springs and support rods at its top and bottom, respectively, allowing it to vibrate while being installed within the washing machine housing. A coaxially mounted drum is fitted inside the outer drum. Both the outer drum and drum are formed by cylindrical sidewalls. Corresponding openings on the same side of both the outer drum and drum form the drum opening and the outer drum opening, respectively. Corresponding openings on the other side are sealed, forming the drum bottom and the outer drum bottom, respectively. Simultaneously, an outward-opening door is installed at the front of the washing machine housing, allowing the outer drum opening to be closed or opened by opening and closing the door. An outward-opening drum door is also installed on the drum, allowing the drum opening to be closed or opened by opening and closing the drum door. This achieves the effect of installing a drum within the outer drum that can rotate relative to its axis and forms a closed water container during washing.

[0063] The center of the drum bottom is coaxially aligned with the motor shaft of the washing machine's drive motor to drive the drum to rotate. Both the drum and the drive motor are fixedly mounted on the outer drum. Preferably, the drum bottom and the drive motor are respectively located on opposite sides of the outer drum bottom. The drive motor is fixedly connected to the outer drum, and the motor shaft of the drive motor passes through the outer drum bottom via a bearing and is coaxially fixedly connected to the drum bottom. The motor shaft of the drive motor can rotate relative to the outer drum, thus achieving the purpose of mounting the drum and drive motor on the outer drum and allowing the drum to rotate independently under the action of the drive motor to wash the clothes inside. Preferably, the motor shaft of the drive motor directly constitutes the drum shaft, and the drum shaft is coaxially fixedly connected to the drum bottom (not shown in the accompanying drawings).

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drum assembly comprising a drum, the drum having a barrel wall with a smooth region and a profiled region, characterised in that: The smooth area is provided with a drainage port, and the profiled area is provided with a plurality of profiles, and the adjacent profiles form flow channels for guiding water in the roller to the smooth area; the profiled area is provided with a plurality of parallel profiles arranged along the circumferential direction of the roller, and the end of the profile is arranged towards the adjacent smooth area; The profiled area is divided into a first area near the left side of the smooth area and a second area near the right side of the smooth area along the circumferential direction of the roller, and the first area and the second area are respectively provided with a first group of profiles and a second group of profiles, and the first group of profiles and the second group of profiles are symmetrically arranged relative to the center line of the profiled area; the center line of the profiled area is parallel to the axis of the roller and has equal distances on the opposite sides of the profiled area in the circumferential direction of the roller; The profiles arranged in the first profiled area and the second profiled area respectively include a plurality of parallel front profiles extending from the cylinder opening of the roller to the direction of the middle surface of the roller, and a plurality of parallel rear profiles extending from the cylinder bottom of the roller to the direction of the middle surface of the roller; each front profile and each rear profile are correspondingly arranged relative to the middle surface of the roller, so that the corresponding front profiles and rear profiles arranged in groups jointly form a "V" shape; the middle surface of the roller is a vertical surface perpendicular to the axis of the roller and having equal distances between the cylinder opening and the cylinder bottom. The smooth area is provided with a lifting rib protruding into the interior of the roller, the lifting rib is buckled on the inner side of the cylinder wall of the roller corresponding to the drainage port, the interior of the lifting rib is hollow, the interior of the lifting rib is provided with a valve body structure corresponding to the opening and closing of the drainage port, and the interior of the lifting rib is communicated with the interior of the roller through the through hole provided on the lifting rib and / or the gap between the lifting rib and the cylinder wall of the roller; one end of each profile near the smooth area near the middle surface of the roller is arranged at the end of the strip-shaped lifting rib.

2. The drum assembly of claim 1, wherein, The middle part of the smooth area of the roller is provided with a drainage port, and the end of the profile is arranged towards the drainage port in the middle part of the smooth area.

3. The drum assembly of claim 1, wherein, Each front profile is a diagonal line extending from the cylinder opening of the roller to the direction of the middle surface of the roller, gradually inclined to the side near the smooth area; each rear profile is a diagonal line extending from the cylinder bottom of the roller to the direction of the middle surface of the roller, gradually inclined to the side near the smooth area.

4. The drum assembly of claim 3, wherein, The angle between each front profile and the axis of the roller is the same, and the angle between each rear profile and the axis of the roller is the same. The angle between each front profile and the axis of the roller is the same, and the angle between each rear profile and the axis of the roller is the same.

5. The drum assembly of claim 3, wherein, Each front profile and each rear profile extends along a cylindrical helix of the roller wall, and the front profile and the rear profile extend along a cylindrical helix having the same lead and equal cylindrical surface diameter; the front profile and the rear profile extend along a cylindrical helix having opposite directions.

6. The drum assembly of claim 5, wherein, One end of each front profile near the cylinder opening is relatively close to one end of the middle surface of the roller away from the smooth area, and one end of each rear profile near the cylinder bottom is relatively close to one end of the middle surface of the roller away from the smooth area.

7. The drum assembly of claim 3, wherein, Among the front profiles arranged in the profiled area, the extension length of the front profile near the smooth area is less than the extension length of the front profile away from the smooth area; among the rear profiles arranged in the profiled area, the extension length of the rear profile near the smooth area is less than the extension length of the rear profile away from the smooth area.

8. The drum assembly of claim 7, wherein, Each front profile and each rear profile arranged in the profiled area is one-to-one and equal in length.

9. The drum assembly of any one of claims 1 to 8, wherein, A plurality of smooth areas and a plurality of profiled areas are alternately arranged on the drum wall along the circumferential direction of the drum, and each profiled area is respectively provided with a first group of profiles and a second group of profiles for guiding water flow to different adjacent smooth areas.

10. The drum assembly of any one of claims 1 to 8, wherein, The profiled area is provided with a protrusion protruding towards the inside of the drum, and the distance between the profiled area and the drum axis is less than or equal to the distance between the drain port and the drum axis. 11.A laundry treating apparatus, characterized by: A drum assembly as claimed in any one of claims 1 to 10 mounted within a housing.

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