Washing machine outer barrel and washing machine
By setting a microbubble generating chamber and cavitation structure on the outer drum of the washing machine, and supplementing gas and water through the air inlet and water inlet, and recycling gas through the return gas structure, the problem of high cost and complex structure of existing microbubble generating devices in washing machines is solved, achieving low-cost and high-efficiency cleaning effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2026-03-06
AI Technical Summary
Existing microbubble generators for washing machines have complex structures, many parts, high costs, are difficult to maintain, and occupy a large space.
A microbubble generating chamber is sealed on the outer drum of the washing machine. Gas and water are supplied to the microbubble generating chamber through the air inlet and water inlet. Combined with the cavitation structure, the bubble generation rate is improved, the number of parts is reduced, and the gas is recycled using the gas return structure, simplifying the structure.
It reduces the cost and structural complexity of the washing machine, improves the microbubble cleaning effect, reduces maintenance difficulty, and saves internal space.
Smart Images
Figure CN223974367U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cleaning equipment technology, and more specifically, to a washing machine outer drum and a washing machine. Background Technology
[0002] In modern washing machine technology, microbubble generators, as an emerging washing aid technology, are widely used to improve washing performance and garment care. Traditional microbubble generators have a relatively complex structure, typically including multiple components such as a dissolved air tank cover, a dissolved air tank bottom cover, a cavitation nozzle, an explosion-proof rubber hose, and a return air valve. The dissolved air tank dissolves air to form microbubbles, the cavitation nozzle is the key component for microbubble generation, and the explosion-proof rubber hose and return air valve ensure the safety and reliability of the device during operation. However, the large number of components, some of which form multiple modules, installed in designated locations within the washing machine, makes the manufacturing process more complex and costly, requiring multiple assembly and calibrations. Furthermore, after prolonged operation, individual components may wear out or malfunction, increasing the difficulty of maintenance and repair. The numerous components also occupy valuable limited space inside the washing machine. Therefore, the urgent need for a washing machine with a microbubble generator that can guarantee effective performance while saving cost and space is a pressing problem in this field. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a low-cost washing machine outer drum and washing machine.
[0004] To achieve the above objectives, the technical solution provided by an embodiment of this utility model is as follows:
[0005] A washing machine outer drum includes: a drum body, the drum body having a microbubble generating chamber, the microbubble generating chamber being sealed, the drum body also having an air inlet communicating with the microbubble generating chamber; a water inlet; and a cavitation structure, the water inlet and the cavitation structure communicating with the microbubble generating chamber. By sealing the microbubble generating chamber on the drum body, gas and water are supplied to the microbubble generating chamber through the air inlet and the water inlet. When the gas and water come into contact, bubbles are generated. The cavitation structure further improves the bubble generation rate, ensuring the cleaning effect of microbubbles. Simultaneously, placing the microbubble generating chamber on the drum body avoids the need for components such as the dissolved gas tank cover and explosion-proof rubber tube found in existing technologies, reducing the number of components and achieving the effect of reducing the cost and structural complexity of the washing machine.
[0006] Furthermore, the washing machine's outer drum also includes a gas return structure, which is located at the gas inlet. This gas return structure replenishes the microbubble generating chamber with gas in a timely manner. The gas return structure is detachably connected to the washing machine's outer drum for easy assembly.
[0007] Furthermore, the microbubble generating chamber is formed at the bottom of the cylinder. By placing the microbubble generating chamber at the bottom of the cylinder, bubbles can gradually enter the cylinder from bottom to top. If the microbubble generating chamber is placed at the top of the cylinder, the water containing microbubbles entering the cylinder from the top will cause the microbubbles to burst due to the height difference between the cavitation structure and the liquid level inside the cylinder, resulting in a decrease in cleaning effect.
[0008] Furthermore, the microbubble generating chamber extends circumferentially along the bottom of the cylinder in an arc shape. By setting the microbubble generating chamber in an arc shape, it can better adapt to the space on the cylinder.
[0009] Furthermore, the water inlet and the cavitation structure are located at opposite ends of the microbubble generating chamber. Since the inner diameter of the cavitation structure gradually decreases from both ends to the middle, if the water inlet and the cavitation structure are located at the same end of the microbubble generating chamber, it would be difficult for water or cleaning fluid to enter the cavitation structure after entering the microbubble generating chamber from the water inlet. However, the arrangement of the water inlet and the cavitation structure at opposite ends of the microbubble generating chamber allows water or cleaning fluid to slowly enter the cavitation structure.
[0010] Furthermore, the cylinder includes: a main body having a grooved structure; a cover covering the groove opening of the grooved structure, forming a microbubble generating chamber between the grooved structure and the cover; a water inlet, a cavitation structure, and an air supply port located on the main body or the cover; and a reinforcing structure located on the main body, comprising multiple reinforcing ribs spaced apart, with some of the ribs forming a grooved structure. By providing a reinforcing structure on the main body, the structural strength of the cylinder is improved. The grooved structure formed by the gaps between the multiple reinforcing ribs allows for efficient use of space on the cylinder, avoiding the need for additional space. The cover covering the groove opening and detachably connected to the main body facilitates manufacturing. Furthermore, to further reduce the space occupied by the cylinder, the cover can partially extend into the grooved structure, with its top surface flush with the reinforcing structure.
[0011] Furthermore, the water inlet and air inlet are located on the cover; and / or the cavitation structure is located on the main body. Located on the cover facilitates processing, and the air return structure and air inlet are more easily connected. The cavitation structure is integrally formed with the main body to improve connection strength.
[0012] Furthermore, a sealing ring is provided at the connection between the top cover and the main body; or the top cover and the main body are heat-fused together. Using a sealing ring prevents leakage from the microbubble generation chamber, reducing production complexity. Heat-fusion welding provides a stronger leak-proof effect, eliminating the need for inspection, but requires a more advanced production process. The choice can be made based on actual needs.
[0013] Furthermore, the cavitation structure has multiple interconnecting holes that connect the microbubble generating chamber to the inner cavity of the cylinder. These multiple interconnecting holes allow for better microbubble generation.
[0014] Furthermore, multiple connecting holes are arranged parallel to each other.
[0015] Furthermore, multiple connecting holes are arranged in a ring on the end face of the cavitation structure. Of course, the multiple connecting holes can also be arranged in other ways.
[0016] Furthermore, a connecting hole is located at the middle position of the end face of the cavitation structure, and multiple connecting holes are arranged sequentially around the connecting hole located at the middle position in the circumferential direction.
[0017] Furthermore, the connecting hole sequentially includes an inlet section, a connecting section, and an outlet section along its extension direction. The inlet section is connected to the microbubble generating cavity, and the outlet section is connected to the inner cavity of the cylinder.
[0018] Furthermore, the cross-sectional area of the orifice in the inlet section gradually decreases towards the outlet section; and / or the cross-sectional area of the orifice in the outlet section gradually increases away from the inlet section. By limiting the diameter of the connecting orifice, more microbubbles can be generated, resulting in a simple structure.
[0019] Furthermore, the cavitation structure is integrally formed with the cylinder body; and / or when the cylinder body is axially horizontal, the microbubble generating chamber is located on one side of the bottom of the cylinder body and extends circumferentially from top to bottom. Integrating the cavitation structure with the cylinder body prevents water or cleaning fluid from entering the microbubble generating chamber through the gap between the cavitation structure and the cylinder body.
[0020] This utility model also provides a washing machine, including the washing machine outer drum described above.
[0021] This invention has the following advantages: By sealing a microbubble generating chamber on the drum, gas and water are supplied to the microbubble generating chamber through the gas inlet and water inlet. When the gas and water come into contact, bubbles are generated. The cavitation structure can further improve the bubble generation rate, ensuring the cleaning effect of microbubbles. At the same time, setting the microbubble generating chamber on the drum avoids the need for components such as the lower cover of the dissolved gas tank and the explosion-proof rubber tube in the prior art, reducing the number of components and achieving the effect of reducing the cost and structural complexity of the washing machine. This application solves the problem of high cost of washing machines with microbubble generating devices in the prior art. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 An exploded view of the outer drum of a washing machine according to a specific embodiment of this utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the outer drum of a washing machine according to a specific embodiment of the present utility model;
[0025] Figure 3 for Figure 2 Cross-sectional view of AA;
[0026] Figure 4 This is a schematic diagram of the structure of a washing machine without a cover, provided in a specific embodiment of the present invention.
[0027] Figure 5 for Figure 4 Cross-sectional view of BB;
[0028] Figure 6 for Figure 4 A magnified view of a section at point C;
[0029] Figure 7 for Figure 5 A magnified view of a section at point D.
[0030] The above figures include the following reference numerals:
[0031] 10. Cylinder body; 11. Air inlet; 12. Main body; 121. Groove structure; 13. Cover; 14. Reinforcing structure; 20. Water inlet; 30. Cavitation structure; 31. Connecting hole; 311. Inlet section; 312. Connecting section; 313. Outlet section; 40. Air return structure. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0035] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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 utility model.
[0036] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] In the description of the embodiments of this utility model, it should also be noted that the terms "first" and "second" used herein do not specifically refer to any order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.
[0038] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0039] The technical solution of this utility model will now be described with reference to the accompanying drawings.
[0040] To address the issue of high cost in existing washing machines equipped with microbubble generators, this invention provides a washing machine outer drum and a washing machine.
[0041] To achieve the above objectives, the technical solution provided by an embodiment of this utility model is as follows:
[0042] like Figures 1 to 7 As shown, this utility model provides a washing machine, which includes an outer drum. The outer drum includes multiple structural components, primarily a drum body 10. The drum body 10 has a microbubble generating chamber, a water inlet 20, a cavitation structure 30, and a return air structure 40. The cavitation structure 30 connects the microbubble generating chamber to the interior of the drum body 10. Gas and liquid are injected into the microbubble generating chamber via the return air structure 40 and the water inlet 20. After the gas and liquid mix, they enter the interior of the drum body 10 through the cavitation structure 30, generating more microbubbles and thus improving the cleaning effect of the washing machine.
[0043] The following describes how to unfold the outer drum of the washing machine.
[0044] like Figures 1 to 6 As shown, the outer drum of the washing machine includes a drum body 10, a water inlet 20, and a cavitation structure 30. The drum body 10 has a microbubble generating chamber, which is sealed. The drum body 10 also has an air inlet 11, which is connected to the microbubble generating chamber. The water inlet 20 and the cavitation structure 30 are connected to the microbubble generating chamber.
[0045] By sealing a microbubble generating chamber on the drum 10, gas and water are supplied to the microbubble generating chamber through the air inlet 11 and the water inlet 20. When the gas and water come into contact, bubbles are generated. The cavitation structure 30 can further improve the bubble generation rate, ensuring the cleaning effect of microbubbles. At the same time, setting the microbubble generating chamber on the drum 10 can avoid the need for components such as the lower cover of the dissolved gas tank and the explosion-proof rubber tube in the prior art, reducing the number of components and achieving the effect of reducing the cost and structural complexity of the washing machine.
[0046] Specifically, the microbubble generating chamber is located at one end of the outer side of the cylinder 10.
[0047] like Figures 1 to 3 As shown, the washing machine outer drum also includes a gas return structure 40, which is located at the gas supply port 11. The gas return structure 40 replenishes gas to the microbubble generating chamber in a timely manner. The gas return structure 40 is detachably connected to the washing machine outer drum for easy assembly.
[0048] Specifically, the return gas structure 40 is a return gas valve, which adjusts the amount and speed of gas injected into the microbubble generating chamber. The return gas structure 40 allows the gas in the microbubble generating chamber to be recycled, improving the microbubble generation efficiency, while also maintaining stable pressure inside the chamber and preventing excessive pressure from damaging the washing machine.
[0049] Furthermore, by circulating gas, the washing machine can increase the amount of microbubbles generated without increasing energy consumption. When a large number of microbubbles burst on the surface of the clothes, they generate a powerful impact force, which can effectively remove stains from the clothes, thereby improving washing efficiency.
[0050] In this embodiment, to improve the cleaning effect, a microbubble generating chamber is formed at the bottom of the cylinder 10. By placing the microbubble generating chamber at the bottom of the cylinder 10, bubbles can gradually enter the cylinder 10 from bottom to top. If the microbubble generating chamber were placed at the top of the cylinder 10, the water containing microbubbles entering the cylinder 10 from the top would cause the microbubbles to burst due to the height difference between the cavitation structure 30 and the liquid level inside the cylinder 10, resulting in a decrease in the cleaning effect.
[0051] Specifically, the microbubble generating chamber is located on the outer side of the bottom of the cylinder 10, which facilitates processing.
[0052] In this embodiment, in order to fit the cylindrical body 10, the microbubble generating chamber extends in an arc shape along the circumference of the bottom of the body 10.
[0053] Specifically, this design increases the volume of the microbubble generating chamber, thereby increasing the amount of microbubbles produced. It also ensures that the microbubbles are evenly distributed throughout the washing space during the washing process, improving washing uniformity. The curved extension design allows the washing machine to generate a large number of microbubbles within a limited space while also guiding the incoming water flow.
[0054] Furthermore, when the cylinder 10 is axially horizontal, the microbubble generating chamber is located on one side of the bottom of the cylinder 10 and extends circumferentially from top to bottom along the cylinder 10. See the attached diagram for details. Figure 1 and attached Figure 4 .
[0055] In this embodiment, the water inlet 20 and the cavitation structure 30 are located at both ends of the microbubble generating chamber. Since the inner diameter of the cavitation structure 30 gradually decreases from both ends to the middle, if the water inlet 20 and the cavitation structure 30 are located at the same end of the microbubble generating chamber, it would be difficult for water or cleaning fluid to enter the cavitation structure 30 after entering the microbubble generating chamber from the water inlet 20. However, the arrangement of the water inlet 20 and the cavitation structure 30 at both ends of the microbubble generating chamber allows water or cleaning fluid to slowly enter the cavitation structure 30.
[0056] Specifically, this configuration can also reduce the erosion of the cavitation structure 30 by water or cleaning fluid, thereby improving the service life of the cavitation structure 30.
[0057] In this embodiment, in order to facilitate the installation of the return gas structure 40 and the pipeline for supplying water to the microbubble generating chamber, the water inlet 20 and the air supply port 11 are provided on the cover 13.
[0058] Specifically, the water inlet 20 is formed by protruding from the cover 13 in a direction away from the microbubble generating chamber, or the water inlet 20 is a separate structural component. The outer peripheral side of the water inlet 20 is provided with external threads, and the cover 13 is provided with internal threads. The water inlet 20 is threadedly connected to the cover 13.
[0059] like Figures 1 to 4 As shown, the cylinder 10 also has several different structures. The cylinder 10 includes a main body 12, a cover 13, and a reinforcing structure 14. The main body 12 has a groove structure 121. The cover 13 covers the groove opening of the groove structure 121, and a microbubble generating chamber is formed between the groove structure 121 and the cover 13. The water inlet 20, the cavitation structure 30, and the air supply port 11 are provided on the main body 12 or the cover 13. The reinforcing structure 14 is provided on the main body 12 and includes multiple reinforcing ribs. The multiple reinforcing ribs are spaced apart, and some of the reinforcing ribs form the groove structure 121. By providing the reinforcing structure 14 on the main body 12, the structural strength of the cylinder 10 is improved. The groove structure 121 formed by the gaps between the multiple reinforcing ribs can make reasonable use of the space on the cylinder 10 and avoid occupying additional space. The cover 13 is placed over the groove and detachably connected to the main body 12, which facilitates production and processing. At the same time, in order to further reduce the space occupied by the cylinder 10, the cover 13 can be partially inserted into the groove structure 121, and the top surface of the cover 13 is flush with the reinforcing structure 14.
[0060] Specifically, the multiple reinforcing ribs include multiple strip ribs arranged radially along the body portion 12 and multiple annular ribs arranged coaxially with the body portion 12. The annular ribs and strip ribs cooperate to strengthen the body portion 12. A groove structure 121 is formed between two adjacent annular ribs. That is, the sidewall of the groove structure 121 is a strip rib or annular rib. Compared with the method of additionally setting structural components in the prior art, this application can maximize the use of the structure on the cylinder 10, which is convenient for processing and can also reduce costs.
[0061] In this embodiment, to ensure the sealing effect of the microbubble generating chamber, the cover 13 and the body 12 can be connected in different ways. When the cover 13 and the body 12 are detachably connected, a screw passes through the through hole on the cover 13 and connects to the threaded hole on the body 12, thereby connecting the cover 13 and the body 12. At this time, a sealing ring is provided at the connection position between the cover 13 and the body 12 to prevent liquid from flowing out of the microbubble generating chamber. Of course, the cover 13 and the body 12 can also be heat-fused together.
[0062] Specifically, setting a sealing ring to prevent leakage from the microbubble generation chamber can reduce the production process, while using hot melt welding can achieve a stronger leak-proof effect without inspection, but it requires a more advanced production process. The choice can be made according to actual needs.
[0063] In this embodiment, the cavitation structure 30 is integrally formed with the cylinder 10, that is, the cavitation structure 30 is disposed on the body part 12 and integrally formed with the body part 12.
[0064] Specifically, part of the cavitation structure 30 is located inside the microbubble generating chamber, and the other part is located inside the cylinder 10.
[0065] like Figures 6 to 7 As shown, the cavitation structure 30 has multiple connecting holes 31, which connect the microbubble generating chamber to the inner cavity of the cylinder 10. The multiple connecting holes 31 are used to better generate microbubbles.
[0066] In this embodiment, multiple connecting holes 31 are distributed in a ring shape on the end face of the cavitation structure 30.
[0067] Specifically, a connecting hole 31 is located at the middle position of the end face of the cavitation structure 30, and multiple connecting holes 31 are arranged sequentially around the connecting hole 31 located at the middle position. Of course, the multiple connecting holes 31 can also be arranged in other ways.
[0068] In this embodiment, multiple connecting holes 31 are arranged parallel to each other.
[0069] Specifically, the multiple connecting holes 31 are arranged in parallel to each other for easy processing, and the cleaning liquid or water discharged from each connecting hole 31 does not interfere with each other.
[0070] like Figure 7 As shown, the connecting hole 31 includes an inlet section 311, a connecting section 312, and an outlet section 313 in sequence along its extension direction. The inlet section 311 is connected to the microbubble generating chamber, and the outlet section 313 is connected to the inner cavity of the cylinder 10. The cross-sectional area of the hole in the inlet section 311 gradually decreases in the direction toward the outlet section 313, and the cross-sectional area of the hole in the outlet section 313 gradually increases in the direction away from the inlet section 311.
[0071] Specifically, adjusting the pore size of the inlet section 311, the connecting section 312, and the outlet section 313 can improve the efficiency of microbubble generation.
[0072] Furthermore, this design ensures thorough mixing of water flow and bubbles within the microbubble generating chamber, improving the efficiency of microbubble generation, while also guaranteeing the uniform distribution of microbubbles within the washing space of the drum 10.
[0073] This utility model also provides a washing machine. The washing machine includes the aforementioned outer drum, body, air pump, and water pump. The outer drum is located within the body, and the air pump and water pump are respectively connected to the air return structure 40 and the water inlet 20. This utility model has at least the following beneficial effects:
[0074] By sealing a microbubble generating chamber on the drum 10, gas and water are supplied to the microbubble generating chamber through the air inlet 11 and the water inlet 20. When the gas and water come into contact, bubbles are generated. The cavitation structure 30 can further improve the bubble generation rate, ensuring the cleaning effect of microbubbles. At the same time, setting the microbubble generating chamber on the drum 10 can avoid the need for components such as the lower cover of the dissolved gas tank and the explosion-proof rubber tube in the prior art, reducing the number of components and achieving the effect of reducing the cost and structural complexity of the washing machine.
[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A washing machine outer tub characterized by, The drum comprises: a drum body having a micro-bubble generating cavity, the drum body further having a gas supplement port in communication with the micro-bubble generating cavity; a water inlet interface; a cavitation structure, the water inlet interface and the cavitation structure being in communication with the micro-bubble generating cavity; the drum body comprises: a body portion having a groove structure; a cover body covering the groove structure, the micro-bubble generating cavity being formed between the groove structure and the cover body, the water inlet interface, the cavitation structure and the gas supplement port being arranged on the body portion or the cover body; a reinforcing structure arranged on the body portion, the reinforcing structure comprising a plurality of reinforcing ribs, the reinforcing ribs being arranged at intervals, and part of the reinforcing ribs forming the groove structure.
2. The laundry machine outer tub according to claim 1, characterized in that, The drum further comprises a gas return structure arranged at the gas supplement port.
3. The laundry machine outer tub according to claim 1, characterized in that, The micro-bubble generating cavity is formed at the bottom of the drum.
4. The laundry machine outer tub according to claim 3, characterized in that, The micro-bubble generating cavity extends along the circumference of the bottom of the drum in an arc shape.
5. The laundry machine outer tub according to claim 1, wherein The water inlet interface and the cavitation structure are located at two ends of the micro-bubble generating cavity.
6. The drum of the washing machine according to claim 1, wherein: the water inlet interface and the gas supplement port are arranged on the cover body; and / or the cavitation structure is arranged on the body portion.
7. The drum of the washing machine according to claim 1, wherein: a sealing ring is arranged at the connecting position of the cover body and the body portion; or the cover body and the body portion are heat-welded together.
8. The laundry machine outer tub according to any one of claims 1 to 7, characterized in that, The cavitation structure has a plurality of communication holes, the communication holes sequentially comprising an inlet section, a communication section and an outlet section along the extension direction thereof, the inlet section being in communication with the micro-bubble generating cavity, and the outlet section being in communication with the inner cavity of the drum body, the cross-sectional area of the inlet section gradually decreases in the direction towards the outlet section; and / or the cross-sectional area of the outlet section gradually increases in the direction away from the inlet section.
9. The drum of the washing machine according to any one of claims 1 to 7, wherein: the cavitation structure is integrally formed with the drum body; and / or when the drum body is arranged horizontally along the axial direction, the micro-bubble generating cavity is located at one side of the bottom of the drum body and extends along the circumference of the drum body from top to bottom.
10. A laundry machine characterized by The drum of the washing machine according to any one of claims 1 to 9.