阅读说明：本技术 滚筒洗衣机及其内筒组件 (Drum washing machine and inner barrel assembly thereof ) 是由 许升 赵志强 赵新宇 吕佩师 于 2018-06-15 设计创作，主要内容包括：本发明属于衣物处理设备技术领域,具体提供一种滚筒洗衣机及其内筒组件。本发明旨在解决现有的循环喷淋装置影响用户通过玻璃观察窗观察滚筒洗衣机内衣物的问题。本发明的内筒组件包括内筒本体、与内筒本体底端的外侧密封连接的封盖、形成在内筒本体和封盖之间的水腔、形成在内筒本体底端上的多个喷射孔以及用于支撑内筒本体转动的传动轴。其中,传动轴沿其轴线方向设置有与水腔连通的通道。本发明的滚筒洗衣机还包括进水口通向外筒内、出水口与通道连通的循环泵。循环泵能够将外筒中的洗涤水通过通道泵送给所述水腔,进而通过多个喷射孔将洗涤水喷进内筒本体中。因此,本发明的滚筒洗衣机避免了喷射孔喷出的洗涤水完全覆盖内筒前端的情形。(The invention belongs to the technical field of clothes treatment equipment, and particularly provides a drum washing machine and an inner drum assembly thereof. The invention aims to solve the problem that the existing circulating spraying device influences a user to observe clothes in a drum washing machine through a glass observation window. The inner cylinder assembly comprises an inner cylinder body, a sealing cover hermetically connected with the outer side of the bottom end of the inner cylinder body, a water cavity formed between the inner cylinder body and the sealing cover, a plurality of injection holes formed in the bottom end of the inner cylinder body and a transmission shaft used for supporting the inner cylinder body to rotate. Wherein, the transmission shaft is provided with a channel communicated with the water cavity along the axis direction. The drum washing machine of the invention also comprises a circulating pump with a water inlet communicated with the inside of the outer drum and a water outlet communicated with the channel. The circulating pump can be with the washing water in the urceolus through the passageway pump sending for the water cavity, and then spout the washing water into the inner tube body through a plurality of jet orifices. Therefore, the drum washing machine of the invention avoids the condition that the washing water sprayed from the spray holes completely covers the front end of the inner drum.)

1. An inner barrel assembly of a drum washing machine is characterized in that the inner barrel assembly comprises an inner barrel body, a water cavity arranged on the inner barrel body and a plurality of jet holes arranged on the inner barrel body;

the plurality of injection holes are respectively communicated with the water cavity and are used for spraying tap water or washing water in the water cavity into the inner barrel body.

2. A drum assembly for a drum washing machine according to claim 1, characterized in that the drum assembly further comprises a cover, the cover is connected with the bottom end of the drum body in a sealing way, and the water cavity is formed between the cover and the drum body.

3. The drum type washing machine inner drum assembly according to claim 2, characterized in that one side of the bottom end of the inner drum body facing the cover is provided with a first groove constituting the water chamber; and/or one side of the sealing cover facing the bottom end of the inner cylinder body is provided with a second groove forming the water cavity.

4. A drum assembly for a drum washing machine according to claim 3, characterized in that the cover is arranged outside the drum body, and the cover is provided with a water inlet hole communicated with the water cavity.

5. The inner drum assembly of a drum washing machine as claimed in claim 4, characterized in that the inner drum assembly further comprises a transmission shaft for driving the inner drum body to rotate, and one end of the transmission shaft is inserted into the water inlet hole and fixedly connected with the sealing cover;

the transmission shaft is provided with a channel along the axis direction, one end of the channel is communicated with the water cavity, and the other end of the channel is communicated with the outside.

6. A drum assembly for a drum washing machine according to any one of claims 2 to 5, characterized in that the cover is triangular or Y-shaped; and/or the water chamber is triangular or Y-shaped.

7. A drum assembly for a drum washing machine according to claim 6, characterized in that the plurality of spray holes are uniformly arranged on the drum body.

8. A drum washing machine, characterized in that it comprises a water supply device for supplying water to the water chamber and the inner drum assembly of any one of claims 1 to 7.

9. A drum washing machine according to claim 8, characterized in that the water supply device is a circulation pump, the water inlet of which opens into the outer tub, and the water outlet of which communicates with the water chamber.

10. A drum washing machine according to claim 8, characterized in that the water supply device is a water inlet valve, the water inlet valve port of the water inlet valve is connected with a water source, and the water outlet valve port of the water inlet valve is communicated with the water cavity.

Technical Field

The invention belongs to the technical field of clothes treatment equipment, and particularly provides a drum washing machine and an inner drum assembly thereof.

Background

The existing drum washing machine originates from Europe and mainly comprises a box body, an outer drum and an inner drum from outside to inside. The drum washing machine operates in a manner similar to the principle of hitting clothes with a hammer. When the device works, the inner cylinder is driven by the driving motor to rotate. Along with the rotation of the inner drum, the clothes are continuously lifted and dropped in the drum, and then lifted and dropped again to do repeated movement. Under the combined action of the washing powder and the water, the clothes are washed clean.

In order to improve the effect of washing and rinsing the clothes by water flow, some drum washing machines are also provided with a circulating spraying device. A drum type washing machine, as disclosed in patent publication No. CN102482834B, has a circulation path provided therein, one end of which leads to a bottom end of a water tub (outer tub), and the other end of which leads to a plurality of discharge ports provided at an opening edge of the water tub. The circulation path can supply the washing water from the bottom end of the water tank to the plurality of spray ports, and further spray the washing water into the drum (inner drum) to circularly wash the clothes.

However, the circulating shower device (specifically, the nozzle or the water jet) of the conventional drum washing machine is disposed near the front end of the outer tub, and sprays the washing water into the inner tub from the outer tub opening. When a user observes clothes from the glass observation window, the sprayed water flow influences the sight of the user, so that the user cannot know the current washing condition of the clothes.

Accordingly, there is a need in the art for a new drum washing machine and drum assembly thereof to solve the above problems.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem that the existing circulating spray device affects the user to observe the clothes in the drum washing machine through the glass observation window, the present invention provides an inner drum assembly of the drum washing machine, wherein the inner drum assembly comprises an inner drum body, a water cavity arranged on the inner drum body, and a plurality of spray holes arranged on the inner drum body; the plurality of injection holes are respectively communicated with the water cavity and are used for spraying tap water or washing water in the water cavity into the inner barrel body.

In a preferred embodiment of the inner cylinder assembly, the inner cylinder assembly further includes a cover, the cover is hermetically connected to a bottom end of the inner cylinder body, and the water chamber is formed between the cover and the inner cylinder body.

In a preferred technical solution of the above inner cylinder assembly, a first groove forming the water cavity is provided at a side of the bottom end of the inner cylinder body facing the seal cover; and/or one side of the sealing cover facing the bottom end of the inner cylinder body is provided with a second groove forming the water cavity.

In a preferred embodiment of the inner cylinder assembly, the cover is disposed outside the inner cylinder body, and the cover is provided with a water inlet hole communicating with the water chamber.

In a preferred technical solution of the above inner cylinder assembly, the inner cylinder assembly further includes a transmission shaft for driving the inner cylinder body to rotate, and one end of the transmission shaft is inserted into the water inlet hole and fixedly connected with the sealing cover; the transmission shaft is provided with a channel along the axis direction, one end of the channel is communicated with the water cavity, and the other end of the channel is communicated with the outside.

In a preferred embodiment of the inner barrel assembly, the sealing cover is triangular or Y-shaped; and/or the water chamber is triangular or Y-shaped.

In a preferred embodiment of the inner cylinder assembly, the plurality of injection holes are uniformly provided in the inner cylinder body.

In addition, the invention also provides a drum washing machine, which comprises a water supply device and the inner barrel assembly in any one of the preferable technical schemes of the inner barrel assembly, wherein the water supply device is used for supplying water to the water cavity.

In the preferable technical scheme of the drum washing machine, the water supply device is a circulating pump, a water inlet of the circulating pump is communicated with the inner part of the outer barrel, and a water outlet of the circulating pump is communicated with the water cavity.

In the preferable technical scheme of the drum washing machine, the water supply device is a water inlet valve, a water inlet valve port of the water inlet valve is connected with a water source, and a water outlet valve port of the water inlet valve is communicated with the water cavity.

It can be understood by those skilled in the art that, in the preferred embodiment of the present invention, by disposing a plurality of spray holes on the inner tub body, especially by disposing a plurality of spray holes at the bottom of the inner tub body, the situation that the washing water sprayed from the spray holes completely covers the front end of the inner tub body is avoided, so that the user can clearly observe the washing condition of the laundry in the inner tub body through the glass observation window.

In one possible embodiment of the present invention, the drum washing machine of the present invention includes a cabinet, an outer tub fixedly disposed in the cabinet, and a circulation pump, and the inner tub assembly is pivotally disposed in the outer tub through a transmission shaft. The transmission shaft is provided with a channel, and one end of the channel is communicated with the water cavity. The water inlet of the circulating pump is communicated with the inside of the outer barrel, and the water outlet of the circulating pump is communicated with the other end of the channel. When the washing machine works, the circulating pump pumps the washing water in the outer barrel to the water cavity through the channel, and then the washing water is sprayed into the inner barrel body through the plurality of spraying holes.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a front view of a drum washing machine according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic structural view of a driveshaft assembly in an embodiment of the present invention;

fig. 5 is an enlarged view of a portion C in fig. 2.

List of reference numerals:

1. a box body; 2. an outer cylinder; 3. an inner barrel assembly; 31. an inner cylinder body; 311. an injection hole; 32. sealing the cover; 33. a water chamber; 4. a driveshaft assembly; 41. a drive shaft; 411. a channel; 4111. a first channel; 4112. a second channel; 42. a connecting member; 421. a through hole; 422. an annular flange; 43. a bolt; 5. a drive motor; 6. a door body; 61. a glass viewing window; 7. sealing the window gasket; 8. a connecting pipe; 9. draining pump; 10. a drain pipe; 11. a circulation pump; 12. a circulating water pipe; 13. a bearing; 14. and rotating the sealing ring.

Detailed Description

It should be understood by those skilled in the art that the embodiments of the present invention are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the components in the drawings are illustrated in a certain proportional relationship, the proportional relationship is not constant, and those skilled in the art can make modifications as required to adapt to specific applications, and the modified embodiments will still fall within the scope of the present invention.

It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" in the description of the present invention are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 and 2, the drum washing machine of the present invention mainly includes a cabinet 1, an outer tub 2, an inner tub assembly 3, a transmission shaft assembly 4, a driving motor 5, a door body 6, a sealing window gasket 7, a connection pipe 8, a drain pump 9, and a drain pipe 10. Wherein, urceolus 2 is fixed ground and is set up in box 1, and inner tube subassembly 3 rotationally sets up in urceolus 2 through transmission shaft subassembly 4, and driving motor 5 is fixed ground and is set up in the outside of urceolus 2 to driving motor 5 and transmission shaft subassembly 4 coaxial fixed connection. The door 6 is pivotally connected to the cabinet 1. The sealing window gasket 7 is provided between the box body 1 and the outer cylinder 2. A connection pipe 8, a drain pump 9 and a drain pipe 10 are provided in the cabinet 1. One end of the connection pipe 8 is connected with the lower portion of the outer tub 2 (the lower portion of the outer tub 2 in fig. 2), and the other end of the connection pipe 8 is connected with the water inlet of the drain pump 9, which is thus communicated with the outer tub 2. The water outlet of the drainage pump 9 is connected with one end of a drainage pipe 10, and the other end of the drainage pipe 10 is communicated with the outside. The drain pump 9 can drain the washing water in the outer tub 2 through the drain pipe 10.

Further, as will be understood by those skilled in the art, when each portion of the drain pipe 10 is lower than the inner bottom end of the outer tub 2, those skilled in the art can omit the drain pump 9 and replace the drain pump 9 with a stop valve as needed. When the drum washing machine needs to drain, the cut-off valve is opened, so that the washing water in the outer tub 2 is automatically drained from the drain pipe 10 by its own weight.

As shown in fig. 2, a front end of the casing 1 (right side of the casing 1 in fig. 2) is provided with a casing port (not shown), a front end of the outer tub 2 (right side of the outer tub 2 in fig. 2) is provided with an outer tub port (not shown), and a front end of the inner tub assembly 3 (right side of the inner tub assembly 3 in fig. 2) is provided with an inner tub port (not shown). One end of the sealing window gasket 7 is connected with the edge of the opening of the box body in a sealing mode, and the other end of the sealing window gasket 7 is connected with the edge of the opening of the outer barrel in a sealing mode. The door 6 is pivotally provided on the cabinet 1, and the door 6 can close the cabinet opening when closed, preventing the washing water in the tub 2 from overflowing from the cabinet opening.

With continued reference to fig. 2, door 6 includes a glass viewing window 61. When the door 6 closes the cabinet opening, the user can observe the laundry in the inner drum assembly 3 through the glass observation window 61.

As shown in fig. 2 and 3, the inner cartridge assembly 3 of the present invention mainly includes an inner cartridge body 31, a closure 32, and a water chamber 33. Wherein a cap 32 is provided at the bottom end of the inner cylinder body 31 (the left end of the inner cylinder body 31 in fig. 2), the cap 32 and the inner cylinder body 31 are sealingly connected, and thus the water chamber 33 is formed. It will be understood by those skilled in the art that the cover 32 may be disposed either inside the inner cylinder body 31 or outside the inner cylinder body 31. It will also be appreciated by those skilled in the art that the closure cap 32 and the inner barrel body 31 can be sealingly joined together using any feasible joining means, such as ultrasonic welding, cladding, strip screw fastening, etc. Further, the cover 32 and the inner cylinder body 31 may be integrally formed as needed by those skilled in the art.

With continued reference to fig. 2 and 3, the side of the inner cylinder body 31 facing the closure cap 32 is provided with a first recess (not shown) which, when the closure cap 32 and the inner cylinder body 31 are sealingly connected together, forms a water chamber 33. Although not explicitly shown in the drawings, it is apparent from fig. 3 that the first groove is a Y-shaped groove, and thus, the water chamber 33 is a Y-shaped water chamber. In the preferred embodiment of the present invention, the Y-shaped water chamber is disposed coaxially with the inner cylinder body 31. Correspondingly, the cap 32 is also of a Y-shaped configuration. Furthermore, the first groove may be provided in any other feasible configuration, such as an annular groove, a circular groove, a triangular groove, etc., as desired by those skilled in the art. Likewise, the closure 32 may be provided in any other feasible configuration, such as annular, circular, triangular, etc., as desired by those skilled in the art.

In addition, a person skilled in the art can also provide a second groove on the side of the cover 32 facing the inner cylinder body 31 as required. The first and second grooves together constitute a water chamber 33 when the closure cap 32 and the inner cartridge body 31 are sealingly connected together. Alternatively, one skilled in the art can also provide a second groove only on the side of the cover 32 facing the inner cylinder body 31 instead of the first groove on the inner cylinder body 31 as required. The second recess alone constitutes the water chamber 33 when the closure cap 32 and the inner cartridge body 31 are sealingly connected together.

With continued reference to fig. 2, the cover 32 is provided with a water inlet (not shown) communicating with the water chamber 33, and the water inlet is used for introducing washing water or tap water into the water chamber 33. In the preferred embodiment of the present invention, the water inlet hole is used to connect the driving shaft 41. The drive shaft 41 may be connected to or integral with the cover 32 in any feasible manner, such as welding, plugging, screwing.

As shown in fig. 2 and 3, the inner cylinder body 31 is provided with nine injection holes 311, wherein each of the injection holes 311 communicates with the water chamber 33. Preferably, nine injection holes 311 are uniformly provided on the bottom end of the inner cylinder body 31 as shown in fig. 3. Alternatively, the nine injection holes 311 may be arranged in any other arrangement on the inner cylinder body 31 as required by those skilled in the art. For example, nine injection holes 311 are compactly provided in the vicinity of the axis of the inner cylinder body 31. It can be understood by those skilled in the art that the number of the injection holes 311 is not limited to nine shown in fig. 3, but may be any number, such as five, seven, eight, etc.

With continued reference to fig. 2 and 3, each of the injection holes 311 is angled with respect to the axis of the drum body 31 such that the injection holes 311 can uniformly inject the washing water in the water chamber 33 into the drum body 31. Further, the spray holes 311 are formed in a flat shape so that the washing water sprayed from the spray holes 311 is in a waterfall shape. Further, the skilled person may also arrange the injection hole 311 in any other feasible form as needed, for example, arrange the injection hole 311 in a circular hole shape, an elliptical hole shape, a triangular hole shape, etc.

As shown in fig. 4, the propeller shaft assembly of the present invention mainly includes a propeller shaft 41, a connecting member 42, and a bolt 43. Wherein, a passage 411 is provided in the transmission shaft 41 to extend through the axial direction thereof, and the passage 411 includes a first passage 4111 and a second passage 4112 communicating with each other. Wherein, the first channel 4111 is disposed offset from the axis of the transmission shaft 41. The end of the drive shaft 41 adjacent the first passage 4111 is provided with a journal having a diameter smaller than the diameter of the remainder of the drive shaft 41. The journal is also provided coaxially with a threaded bore (not shown). The connecting member 42 is provided with a through hole 421, an annular flange 422 and a mounting hole (not shown).

As shown in fig. 2, in the mounted state, the left end of the transmission shaft 41 is inserted through the rotor of the driving motor 5 and then abutted against the right end of the connecting member 42, and the bolt 43 is inserted through the mounting hole of the connecting member 42 and then screwed into the threaded hole of the transmission shaft 41, thereby fastening the transmission shaft 41, the connecting member 42 and the rotor of the driving motor 5 together. In this state, the annular flange 422 and the propeller shaft 41 are coaxial.

With continued reference to fig. 2, in the installed state, the right end of the drive shaft 41 is inserted into the water inlet hole of the cover 32 and is fixedly connected to or integrally formed with the cover 32 so as to communicate the passage 411 with the water chamber 33. It will be appreciated by those skilled in the art that the drive shaft 41 and the closure cap 32 may be connected together in any feasible manner, such as by screwing, welding, plugging, etc.

Continuing to refer to fig. 2, as an alternative to the above-described solution of making the passage 411 pass through the transmission shaft 41 along the axis of the transmission shaft 41, a person skilled in the art may also make the passage 411 not pass through the right end of the transmission shaft 41, and set the passage 411 in fig. 2 as a blind hole opening at the left end of the transmission shaft 41, if necessary. A radial hole structure is provided at a portion of the drive shaft 41 protruding into the water chamber 33 so as to communicate with the passage 411 and the water chamber 33, respectively.

It will be understood by those skilled in the art that the location of the first passageway 4111 and the threaded bore on the drive shaft 41 is not limited to the one described above. One skilled in the art can also adjust the positions of the first passage 4111 and the threaded hole appropriately as needed. For example, the first passage 4111 is coaxially provided on the transmission shaft 41, and the screw hole is provided offset from the axial center of the transmission shaft 41.

Furthermore, the transmission shaft 41 and the connecting member 42 can be connected together by any other feasible connection method, such as a threaded connection, a snap connection, or an interference fit connection, as required by those skilled in the art.

With continued reference to fig. 2, the drum washing machine of the present invention further includes a circulation pump 11 and a circulation water pipe 12. Wherein the circulation pump 11 is preferably arranged within the tank 1 and fixedly connected to the tank 1. Alternatively, the circulation pump 11 may be fixedly connected to the outer tub 1 as required by those skilled in the art. The inlet of the circulation pump 11 is connected to the connection pipe 8 and thus opens into the interior of the outer tub 2. The water outlet of the circulating pump 11 is connected and communicated with one end of a circulating water pipe 12, and the other end of the circulating water pipe 12 is communicated with the passage 411. In operation, the circulation pump 11 pumps the washing water in the outer tub 2 through the circulation pipe 12 to the passage 411, the passage 411 delivers the washing water to the water chamber 33, and the plurality of spray holes 311 spray the washing water toward the laundry in the inner tub body 31.

As shown in fig. 2 and 5, the water outlet end of the circulating water pipe 12 is inserted into the annular flange 422 of the connecting member 42. Further, a bearing 13 and a rotary seal ring 14 are provided between the circulating water pipe 12 and the connection member 42. The bearing 13 is used for supporting the circulating water pipe 12, so that the transmission shaft 41 can rotate freely relative to the circulating water pipe 12. The rotary packing 14 serves to seal between the circulation water pipe 12 and the connection member 42 and prevent the washing water from leaking out through a gap between the circulation water pipe 12 and the connection member 42.

Further, in the preferred embodiment of the present invention, the water pressure supplied from the circulation pump 11 enables the washing water sprayed from the spray holes 311 to partially fall onto the glass observation window 61 and the sealing window gasket 7. So as to clean the glass observation window 61 and the sealing window gasket 7, and avoid the detergent from accumulating on the glass observation window 61 and the sealing window gasket 7, which affects the cleanliness of the glass observation window 61 and the sealing window gasket 7, and further affects the washing condition of the user observing the clothes in the inner barrel assembly 3 through the glass observation window 61.

It can be understood by those skilled in the art that the circulation pump 11 of the present invention can pump the washing water in the outer tub 2 into the water chamber 33 at the bottom end of the inner tub body 31, and then spray the washing water into the inner tub body 31 through the plurality of spray holes 311 communicated with the water chamber 33. Therefore, compared with the prior art in which the spray holes/nozzles are arranged near the front end of the outer tub 2, the drum washing machine of the present invention prevents the water flow sprayed from the spray holes/nozzles from accumulating at the front end of the outer tub 2, and blocks the view of the user for observing the clothes in the inner tub assembly 3. Furthermore, the washing water sprayed from the plurality of spray holes 311 of the present invention can also clean the glass observation window 61 and the sealing window gasket 7, thereby ensuring the cleanliness of the glass observation window 61 and the sealing window gasket 7. Furthermore, the washing water sprayed from each spray hole 311 rotates along with the rotation of the inner cylinder body 31 to form an annular spray water flow, thereby optimizing the spray effect.

Although not shown in the drawings, the present invention provides another possible embodiment, and one skilled in the art can arrange the cover 32 inside the inner cylinder body 31, arrange the plurality of injection holes 311 on the cover 32, and arrange the water inlet hole at the bottom end of the inner cylinder body 31 as needed. The transmission shaft 41 is directly and fixedly connected with the inner cylinder body 31. In order to improve the connection strength between the transmission shaft 41 and the inner cylinder body 31, the transmission shaft assembly 4 further includes a mounting bracket, one end of which is fixedly connected with the transmission shaft 41, and the other end of which is fixedly connected with the inner cylinder body 31. Wherein the mounting is preferably Y-shaped or triangular.

Although not shown, the present invention provides another embodiment of the drive shaft assembly 4, and one skilled in the art can make the drive shaft assembly 4 only include the drive shaft 41, and make one end of the drive shaft 41 coaxially and fixedly connected with the cover 32, and make the other end of the drive shaft 41 coaxially and fixedly connected with the rotor of the driving motor 5, as required. Further, the first passage 4111 is disposed coaxially with the drive shaft 41, and the diameter of the first passage 4111 is made large enough. The water outlet end of the circulating water pipe 12 is directly inserted into the first passage 4111, and the two are connected together in a rotary sealing manner.

Although not shown in the drawings, the present invention provides another embodiment of the drum washing machine, and those skilled in the art can omit the circulation pump 11 to communicate the water inlet end of the circulation water pipe 12 with the water outlet valve port of the water inlet valve, if necessary. When the inlet port of the inlet valve is connected to an external water source, the inlet valve can supply tap water to the water chamber 33 through the circulating water pipe 12, so that the plurality of injection holes 311 inject the tap water into the inner cylinder body 31.

Although not shown, the present invention also provides another embodiment of the inner barrel assembly, and one skilled in the art can omit the water chamber 33 to make one end of the transmission shaft 41 close to the inner barrel body 31 abut with the inner barrel body 31 in a sealing way according to the requirement. The second passage 4112 has a projected area on the inner cylinder body 31 in the axial direction thereof, and the plurality of injection holes 311 are all disposed in the projected area of the inner cylinder body 31.

In the case that the spraying structure can spray the washing water into the inner cylinder assembly 3 from the rear part and/or the middle part of the inner cylinder assembly 3, the technical solutions formed by splitting the above technical solutions and the technical solutions formed by combining the above technical solutions should fall within the protection scope of the present invention. The combination between the above technical solutions includes a combination of complete technical solutions, and also includes a combination of partial technical features in one technical solution and partial technical features in another technical solution.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.