Inner drum structure and drum washing machine

Abstract

The inner barrel structure comprises an inner barrel and a sealing ring, the sealing ring comprises a sealing body arranged on the periphery of a barrel door of the inner barrel in a sleeving mode and a sealing lip arranged on the periphery of the sealing body, and the end of a barrel opening of the inner barrel abuts against the sealing lip in the axial direction of the inner barrel and extrudes the sealing lip; the free end of the sealing lip is extruded on the inner cylinder door; the sealing lip is axially extruded by the end part of the inner cylinder opening when the inner cylinder door is closed, and the free end of the sealing lip is extruded on the inner cylinder door, so that the sealing lip can be tightly clamped between the end part of the inner cylinder opening and the inner cylinder door, and the assembly strength between the sealing lip and the inner cylinder opening as well as between the sealing lip and the inner cylinder door is increased; and the stability of the sealing lip is improved, so that the sealing performance of the sealing ring is improved, and the sealing performance between the inner cylinder opening and the inner cylinder door is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of household appliances, and in particular relates to an inner drum structure and a drum washing machine. Background Art

[0002] A washing machine is a cleaning appliance invented by people in order to save labor. It uses electrical energy to produce mechanical action to wash clothes. With the improvement of living standards, washing machines have spread to tens of millions of households, providing convenience to people's lives.

[0003] An existing drum washing machine comprises an outer shell, an outer drum arranged in the outer shell, and an inner drum rotatably installed in the outer drum. The inner drum is a hole-free inner drum, one end of the inner drum is provided with an inner drum opening and an inner drum door rotatably installed at the inner drum opening to close the inner drum opening. The inner drum and the inner drum door are used together to form an independent washing chamber, which independently contains washing water when washing clothes. During the washing process, vibration is generated due to the rotation of the inner drum, and strong vibration is generated due to uneven distribution of clothes in the inner drum. The above vibration may cause the assembly gap between the inner drum opening and the inner drum door to leak washing water from the inner drum due to poor sealing.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an inner drum structure and a drum washing machine, wherein the end of the inner drum mouth axially squeezes the sealing lip when the inner drum door is closed, and the free end of the sealing lip is squeezed on the inner drum door, so that the sealing lip can be tightly clamped between the end of the inner drum mouth and the inner drum door, thereby increasing the assembly strength between the sealing lip and the inner drum mouth and the inner drum door, achieving the purpose of improving the stability of the sealing lip, thereby improving the sealing performance of the sealing ring, and increasing the sealing between the inner drum mouth and the inner drum door.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] The present invention provides an inner cylinder structure, comprising an inner cylinder and a sealing ring, wherein the sealing ring comprises a sealing body sleeved on the outer periphery of an inner cylinder door and a sealing lip arranged on the outer periphery of the sealing body, the end of the inner cylinder mouth abuts against the sealing lip along the axial direction of the inner cylinder and squeezes the sealing lip, and the free end of the sealing lip is squeezed on the inner cylinder door.

[0008] Furthermore, the sealing lip extends radially along the inner cylinder, and a deformation cavity is formed between the sealing lip and the sealing body on the outer end face side of the sealing lip for the squeezed sealing lip to deform toward the inner cylinder door. The inner end face of the sealing lip abuts against the end of the inner cylinder mouth, and the free end of the outer end face of the sealing lip is squeezed on the inner cylinder door.

[0009] Furthermore, the sealing body includes an inner sealing section and an outer sealing section which are coaxially arranged, the inner sealing section and the outer sealing section gradually expand from the inside to the outside, the radial dimension of the inner sealing section is smaller than the radial dimension of the outer sealing section, the sealing lip is arranged on the outer periphery of the inner sealing section, and the outer peripheries of the inner and outer sealing sections and the outer end surfaces of the sealing lips form a deformation cavity.

[0010] Furthermore, the inner sealing section and the outer sealing section form the main sealing section of the sealing body. The outer periphery of the main sealing section is arc-shaped and protrudes toward the inner periphery of the inner cylinder. The sealing lip is arranged in the middle part of the inner sealing section in the axial direction of the inner cylinder. The sealing lip gradually extends obliquely from the inner sealing section toward the inner periphery of the inner cylinder.

[0011] Furthermore, a convex rib is provided at the free end of the outer end surface of the sealing lip, and a positioning groove with a notch facing the convex rib is provided on the inner cylinder door, and the convex rib is squeezed into the positioning groove.

[0012] Furthermore, the inner cylinder door includes an inner door section and an outer door section which are coaxially arranged, the inner door section is embedded in the inner cylinder mouth, the inner periphery of the main sealing section is fitted with the outer periphery of the inner door section, the outer door section gradually expands from the inside to the outside, the radial dimension of the inner door section is smaller than the radial dimension of the outer door section, the outer periphery of the outer door section is arc-shaped and protrudes toward the outer periphery of the inner cylinder, and the free end of the outer sealing section cooperates with the outer periphery of the outer door section to form a positioning groove.

[0013] Furthermore, the size of the outer sealing section gradually decreases from the inside to the outside, and the size of the sealing lip gradually decreases from the inside to the outside. The side of the convex rib facing the positioning groove is an arc surface, and the arc surface of the convex rib is squeezed into the positioning groove, against the small-sized end of the outer sealing section and the outer periphery of the outer door section.

[0014] Furthermore, the sealing body also includes an auxiliary sealing segment coaxially arranged with the main sealing segment. The auxiliary sealing segment and the main sealing segment are distributed from inside to outside. An auxiliary sealing lip is provided on the outer periphery of the auxiliary sealing segment. The free end of the auxiliary sealing lip abuts against the inner periphery of the inner tube mouth, and the auxiliary sealing lip is spaced apart from the sealing lip.

[0015] Furthermore, an abutting convex portion is provided on the inner periphery of the auxiliary sealing section, and the door body also includes a sealing section which is coaxial with the inner door section and closes the opening on the inner end face of the inner door section. The sealing section gradually expands from the inside to the outside, and the radial dimension of the sealing section is smaller than the radial dimension of the inner door section. The outer periphery of the sealing section is arc-shaped and convex toward the outer periphery of the inner tube. The inner periphery of the auxiliary sealing section is fitted with the outer periphery of the sealing section, and the inner end face of the sealing section is a sealing face, and the outer end face of the abutting convex portion abuts against the inner end of the sealing face.

[0016] Furthermore, the end of the inner tube mouth is rolled toward the outer periphery of the inner tube to form a curled edge with an arc, and the outer end surface of the sealing lip abuts against the curled edge.

[0017] The present invention also provides a drum washing machine, comprising the inner drum structure provided by the above technical solution.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] The sealing lip is axially squeezed by the end of the inner tube mouth when the inner tube door is closed, and the free end of the sealing lip is squeezed onto the inner tube door, so that the sealing lip can be tightly clamped between the end of the inner tube mouth and the inner tube door, thereby increasing the assembly strength between the sealing lip and the inner tube mouth and the inner tube door, improving the stability of the sealing lip, and then improving the sealing performance of the sealing ring, and increasing the sealing between the inner tube mouth and the inner tube door.

[0020] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0022] Figure 1 is a structural schematic diagram of an inner cylinder structure provided by an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of an inner cylinder structure provided by an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 An enlarged view of the inner cylinder door at A that is not closed;

[0025] Figure 4 yes Figure 2 Enlarged view of the inner cylinder door closed at A.

[0026] Icons: 1-inner cylinder door; 11-inner door section; 12-outer door section; 13-sealing section; 131-sealing surface; 2-sealing ring; 21-sealing body; 211-main sealing section; 2111-inner sealing section; 2112-outer sealing section; 212-auxiliary sealing section; 22-sealing lip; 23-auxiliary sealing lip; 24-abutting convex part; 25-deformation cavity; 26-convex rib; 3-positioning groove; 4-inner cylinder mouth; 41-curling edge.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-4 As shown, the present invention provides an inner cylinder structure, including an inner cylinder and a sealing ring 2, the sealing ring 2 includes a sealing body 21 sleeved on the outer periphery of the inner cylinder door 1 and a sealing lip 22 arranged on the outer periphery of the sealing body 21, the end of the inner cylinder mouth 4 abuts against the sealing lip 22 along the axial direction of the inner cylinder and squeezes the sealing lip 22, and the free end of the sealing lip 22 is squeezed on the inner cylinder door 1.

[0032] In the embodiment of the present invention, the sealing lip 22 is axially squeezed by the end of the inner tube mouth 4 when the inner tube door 1 is closed, and the free end of the sealing lip 22 is squeezed onto the inner tube door 1, so that the sealing lip 22 can be tightly clamped between the end of the inner tube mouth 4 and the inner tube door 1, thereby increasing the assembly strength between the sealing lip 22 and the inner tube mouth 4 and the inner tube door 1, improving the stability of the sealing lip 22, and further improving the sealing performance of the sealing ring 2, thereby increasing the sealing performance between the inner tube mouth 4 and the inner tube door 1.

[0033] The inner drum structure is used for a drum washing machine, which comprises a housing, an outer drum and an inner drum rotatably arranged in the outer drum. The front end of the inner drum is provided with an inner drum opening 4 for clothes to be put in. An inner drum door 1 is rotatably installed at the inner drum opening, and the inner drum door 1 opens and closes the inner drum opening. The inner drum can be a hole-free inner drum. An assembly gap is provided between the inner drum door 1 and the inner drum opening, and a sealing ring 2 is used to seal the assembly gap.

[0034] The sealing ring 2 is annular, and the inner cylinder includes a cylinder body and a front end wall arranged at the front end of the cylinder body. An opening is arranged in the middle of the front end wall, and the front end wall protrudes outward to form a first cylindrical protrusion coaxial with the opening and the cylinder body. The inner periphery of the protrusion forms an inner cylinder mouth 4, and the end of the inner cylinder mouth 4 mentioned above is the outer end of the protrusion.

[0035] A second protrusion in the shape of a cylinder is provided on the inner side surface of the inner cylinder door 1, the inner end of the second protrusion is a blocking end, the second protrusion is coaxially arranged with the first protrusion, the inner end of the second protrusion is a closed end, the second protrusion is embedded in the inner cylinder mouth 4 along the axial direction of the inner cylinder, the second protrusion includes the following inner door section 11, outer door section 12 and blocking section 13, the second protrusion gradually expands from the inside to the outside; the setting of the second protrusion enhances the assembly strength of the inner cylinder door 1 and the inner cylinder mouth 4.

[0036] The inside and outside mentioned in this application are relative to the inner cylinder, that is, the inside facing the inner cylinder is the inside, and the outside facing the inner cylinder is the outside.

[0037] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the sealing lip 22 extends radially along the inner cylinder, and a deformation cavity 25 is formed between the sealing lip 22 and the sealing body 21 on the outer end surface side of the sealing lip 22 for the squeezed sealing lip 22 to deform toward the inner cylinder door 1, the inner end surface of the sealing lip 22 abuts against the end of the inner cylinder mouth 4, and the free end of the outer end surface of the sealing lip 22 is squeezed on the inner cylinder door 1.

[0038] In the embodiment of the present invention, the inner end surface of the sealing lip 22 abuts against the end of the inner tube opening 4 to achieve sealing contact with the inner tube opening 4;

[0039] Preferably, the end of the inner cylinder mouth 4 abuts against the inner end surface of the sealing lip 22 in the middle of the inner cylinder radial direction, so that the sealing lip 22 is squeezed by the end of the inner cylinder mouth 4 in the middle of the inner cylinder radial direction, so that the free end of the sealing lip 22 can be squeezed on the inner cylinder door 1; the deformation cavity 25 provides space for the deformation of the sealing lip 22.

[0040] Furthermore, the sealing body 21 includes an inner sealing segment 2111 and an outer sealing segment 2112 which are coaxially arranged. The inner sealing segment 2111 and the outer sealing segment 2112 gradually expand from the inside to the outside. The radial dimension of the inner sealing segment 2111 is smaller than the radial dimension of the outer sealing segment 2112. The sealing lip 22 is arranged on the outer periphery of the inner sealing segment 2111. The outer peripheries of the inner and outer sealing segments 2112 and the outer end faces of the sealing lip 22 form a deformation cavity 25.

[0041] The deformation cavity 25 can be used for shock absorption, and can buffer the vibration received by the sealing ring 2 , reduce the deformation of the sealing ring 2 , and improve the sealing performance of the sealing ring 2 .

[0042] The sealing body 21 can seal the assembly gap between the inner cylinder mouth 4 and the inner cylinder door 1, and the sealing lip 22 on the sealing body 21 can fit more tightly with the inner cylinder mouth 4, further improving the sealing performance of the sealing body 21;

[0043] The inner end surface of the sealing lip 22 and the end of the inner tube mouth 4 form a first sealing area, and the free end of the outer end surface of the sealing lip 22 is squeezed on the inner tube door 1 to form a second sealing area, which increases the sealing area of ​​the sealing ring 2 while increasing the stability of the sealing lip 22.

[0044] The inner sealing section 2111 and the outer sealing section 2112 are respectively annular, and the sealing lip 22 and the sealing body 21 at the outer end surface of the sealing lip 22 do not intersect, so that the enclosed deformation cavity 25 is open at the end of the sealing lip 22, so that the free end of the outer end surface of the sealing lip 22 can be pressed on the inner cylinder door 1;

[0045] More specifically, the inner sealing section 2111 and the outer sealing section 2112 form the main sealing section 211 of the sealing body 21. The outer periphery of the main sealing section 211 is arc-shaped and protrudes toward the inner periphery of the inner cylinder. The sealing lip 22 is arranged in the middle part of the inner sealing section 2111 in the axial direction of the inner cylinder. The sealing lip 22 gradually extends from the inner sealing section 2111 toward the inner periphery of the inner cylinder.

[0046] The outer periphery of the main sealing section 211 is in an arc shape and convexly extends from the inner periphery of the inner cylinder, which can reduce the connection stress between the sealing lip 22 and the inner sealing section 2111 when the sealing lip 22 is squeezed, thereby avoiding the situation where the sealing lip 22 and the inner sealing section 2111 are prone to fracture;

[0047] There is a first connection between the sealing lip 22 and the inner sealing section 2111, and a second connection between the inner sealing section 2111 and the outer sealing section 2112. The sealing lip 22 is arranged at the middle of the inner sealing section 2111 in the axial direction of the inner cylinder, so that there is a distance between the first connection and the second connection, so that the sealing lip 22 can be squeezed and deformed toward the inner cylinder door 1;

[0048] The sealing lip 22 extends from the inner sealing section 2111 gradually and obliquely toward the inner circumference of the inner cylinder, so that the free end of the outer end surface of the sealing lip 22 is relatively close to the inner cylinder door 1, thereby making the free end of the outer end surface of the sealing lip 22 easily squeezed onto the inner cylinder door 1.

[0049] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, a convex rib 26 is provided at the free end of the outer end surface of the sealing lip 22 , and a positioning groove 3 with a notch facing the convex rib 26 is provided on the inner cylinder door 1 , and the convex rib 26 is squeezed into the positioning groove 3 .

[0050] In the embodiment of the present invention, the convex rib 26 is squeezed into the positioning groove 3, so that the convex rib 26 can fit more closely with the inner cylinder door 1, thereby further increasing the assembly strength between the sealing lip 22 and the inner cylinder door 1, and can increase the sealing performance between the sealing lip 22 and the inner cylinder door 1;

[0051] The convex rib 26 is squeezed into the positioning groove 3, and the space of the deformation cavity 25 becomes smaller relative to the inner cylinder door 1 when it is opened.

[0052] Furthermore, the inner cylinder door 1 includes an inner door section 11 and an outer door section 12 which are coaxially arranged, the inner door section 11 is embedded in the inner cylinder mouth 4, the inner periphery of the main sealing section 211 is fitted with the outer periphery of the inner door section 11, the outer door section 12 gradually expands from the inside to the outside, the radial dimension of the inner door section 11 is smaller than the radial dimension of the outer door section 12, the outer periphery of the outer door section 12 is arc-shaped and protrudes toward the outer periphery of the inner cylinder, and the free end of the outer sealing section 2112 cooperates with the outer periphery of the outer door section 12 to form a positioning groove 3.

[0053] In order to achieve the assembly strength between the inner cylinder door 1 and the sealing ring 2, the inner periphery of the main sealing section 211 of the sealing ring 2 fits with the outer periphery of the inner door section 11. Therefore, the inner door section 11 gradually expands from the inside to the outside. The inner door section 11 is arc-shaped and protrudes toward the inner periphery of the inner cylinder. The protruding directions of the inner door section 11 and the outer door section 12 are opposite, that is, the protruding directions of the main sealing section 211 and the outer door section 12 are opposite, so that a positioning groove 3 is formed between the free section of the outer sealing section 2112 and the outer door section 12 to allow the rib 26 to be squeezed inside.

[0054] More specifically, the size of the outer sealing section 2112 gradually decreases from the inside to the outside, and the size of the sealing lip 22 gradually decreases from the inside to the outside. The side of the convex rib 26 facing the positioning groove 3 is an arc surface, and the arc surface of the convex rib 26 is squeezed into the positioning groove 3, and abuts against the small-sized end of the outer sealing section 2112 and the outer periphery of the outer door section 12;

[0055] The arc surface of the convex rib protrudes toward the positioning groove to abut against the small-sized end of the outer sealing section 2112 and the outer periphery of the outer door section 21 , further increasing the fitting strength between the convex rib 26 and the positioning groove 3 .

[0056] A depression is formed between the convex rib 26 and the sealing lip 22 , and the depression can provide an escape space for the end of the outer sealing section 2112 , so that the end of the outer sealing section 2112 can abut against the convex rib 26 .

[0057] In an embodiment of the present invention, the sealing body 21 also includes an auxiliary sealing segment 212 coaxially arranged with the main sealing segment 211. The auxiliary sealing segment 212 and the main sealing segment 211 are distributed from the inside to the outside. An auxiliary sealing lip 23 is provided on the outer periphery of the auxiliary sealing segment 212. The free end of the auxiliary sealing lip 23 abuts against the inner periphery of the inner tube mouth 4, and the auxiliary sealing lip 23 is spaced apart from the sealing lip 22.

[0058] In the embodiment of the present invention, the free end of the auxiliary sealing lip 23 abuts against the inner circumference of the inner tube mouth 4 to form a third sealing area between the auxiliary sealing lip 23 and the inner tube mouth 4. The third sealing area is close to the inside of the inner tube to achieve multi-layer sealing of the inner tube mouth 4.

[0059] The auxiliary sealing lip 23 is spaced from the sealing lip 22 , and the auxiliary sealing lip 23 and the sealing lip 22 do not intersect each other. A shock absorbing groove is formed between the auxiliary sealing lip 23 and the sealing lip 22 , and the shock absorbing groove can buffer the vibration of the sealing ring 2 .

[0060] Furthermore, an abutting protrusion 24 is provided on the inner periphery of the auxiliary sealing section 212, and the door body also includes a sealing section 13 which is coaxial with the inner door section 11 and closes the opening on the inner end face of the inner door section 11. The sealing section 13 gradually expands from the inside to the outside, and the radial dimension of the sealing section 13 is smaller than the radial dimension of the inner door section 11. The outer periphery of the sealing section 13 is arc-shaped and protrudes toward the outer periphery of the inner tube. The inner periphery of the auxiliary sealing section 212 is fitted with the outer periphery of the sealing section 13, and the inner end face of the sealing section 13 is a sealing face 131. The outer end face of the abutting protrusion 24 abuts against the inner end of the sealing face 131.

[0061] The sealing ring 2 can not only be assembled with the inner cylinder door 1 from the axial direction of the inner cylinder, that is, the inner periphery of the sealing ring 2 fits with the outer periphery of the inner cylinder door 1, but also can be assembled with the inner cylinder door 1 from the radial direction of the inner cylinder through the abutting protrusion 24, thereby enhancing the assembly strength between the sealing ring 2 and the inner cylinder door 1.

[0062] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the end of the inner tube mouth 4 is rolled toward the outer periphery of the inner tube to form a curved edge 41 , and the outer end surface of the sealing lip 22 abuts against the curling edge 41 .

[0063] In the embodiment of the present invention, a curling edge 41 is provided at the end of the inner tube mouth 4, and the end of the inner tube mouth is rolled toward the outer periphery in the following manner: the end wall of the inner tube mouth is first radially bent toward the outer periphery of the inner tube, then axially bent toward the inner tube, and finally radially bent toward the inner periphery of the sealing ring 2, and a gap is formed between the free end of the curling edge 41 and the outer periphery of the inner tube mouth 4;

[0064] By abutting the outer end of the curl 41 against the inner end surface of the sealing lip 22 , the contact area between the sealing lip 22 and the curl 41 can be increased, thereby increasing the sealing area between the inner tube mouth 4 and the sealing lip 22 .

[0065] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. An inner cylinder structure, comprising an inner cylinder and a sealing ring, wherein the sealing ring comprises a sealing body sleeved on the outer periphery of the inner cylinder door and a sealing lip arranged on the outer periphery of the sealing body, characterized in that: The end of the inner cylinder mouth abuts against the sealing lip along the axial direction of the inner cylinder and presses the sealing lip, and the free end of the sealing lip presses on the inner cylinder door.

2. The inner cylinder structure according to claim 1, characterized in that: The sealing lip extends radially along the inner cylinder, and a deformation cavity is formed between the sealing lip and the sealing body on the outer end face side of the sealing lip for the squeezed sealing lip to deform toward the inner cylinder door. The inner end face of the sealing lip abuts against the end of the inner cylinder mouth, and the free end of the outer end face of the sealing lip is squeezed on the inner cylinder door.

3. The inner cylinder structure according to claim 2, characterized in that: The sealing body comprises an inner sealing section and an outer sealing section which are coaxially arranged. The inner sealing section and the outer sealing section gradually expand from the inside to the outside. The radial dimension of the inner sealing section is smaller than the radial dimension of the outer sealing section. The sealing lip is arranged on the outer periphery of the inner sealing section. The outer peripheries of the inner and outer sealing sections and the outer end surfaces of the sealing lips form a deformation cavity.

4. The inner cylinder structure according to claim 3, characterized in that: The inner sealing section and the outer sealing section form the main sealing section of the sealing body. The outer circumference of the main sealing section is arc-shaped and protrudes toward the inner circumference of the inner cylinder. The sealing lip is arranged in the middle part of the inner sealing section in the axial direction of the inner cylinder. The sealing lip gradually extends obliquely from the inner sealing section toward the inner circumference of the inner cylinder.

5. The inner cylinder structure according to claim 2, characterized in that: The free end of the outer end surface of the sealing lip is provided with a convex rib, and the inner cylinder door is provided with a positioning groove with a notch facing the convex rib, and the convex rib is squeezed into the positioning groove.

6. The inner cylinder structure according to claim 5, characterized in that: The inner cylinder door includes an inner door section and an outer door section which are coaxially arranged, the inner door section is embedded in the inner cylinder mouth, the inner periphery of the main sealing section is fitted with the outer periphery of the inner door section, the outer door section gradually expands from the inside to the outside, the radial dimension of the inner door section is smaller than the radial dimension of the outer door section, the outer periphery of the outer door section is arc-shaped and protrudes toward the outer periphery of the inner cylinder, and the free end of the outer sealing section cooperates with the outer periphery of the outer door section to form a positioning groove.

7. The inner cylinder structure according to claim 6, characterized in that: The size of the outer sealing section gradually decreases from the inside to the outside, and the size of the sealing lip gradually decreases from the inside to the outside. The side of the convex rib facing the positioning groove is an arc surface, and the arc surface of the convex rib is squeezed into the positioning groove and abuts against the small-size end of the outer sealing section and the outer periphery of the outer door section; Preferably, the end of the inner tube mouth is rolled toward the outer circumference of the inner tube to form a curled edge with an arc, and the outer end surface of the sealing lip abuts against the curled edge.

8. The inner cylinder structure according to claim 4, characterized in that: The sealing body also includes an auxiliary sealing section coaxially arranged with the main sealing section. The auxiliary sealing section and the main sealing section are distributed from inside to outside. An auxiliary sealing lip is arranged on the outer periphery of the auxiliary sealing section. The free end of the auxiliary sealing lip abuts against the inner periphery of the inner tube mouth, and the auxiliary sealing lip is spaced apart from the sealing lip.

9. The inner cylinder structure according to claim 8, characterized in that: An abutting convex portion is arranged on the inner periphery of the auxiliary sealing section, and the door body also includes a sealing section which is coaxial with the inner door section and closes the opening on the inner end face of the inner door section. The sealing section gradually expands from the inside to the outside, and the radial dimension of the sealing section is smaller than the radial dimension of the inner door section. The outer periphery of the sealing section is arc-shaped and convexly extends toward the outer periphery of the inner tube. The inner periphery of the auxiliary sealing section is fitted with the outer periphery of the sealing section, and the inner end face of the sealing section is a sealing face, and the outer end face of the abutting convex portion abuts against the inner end of the sealing face.

10. A drum washing machine, characterized in that: The invention comprises the inner cylinder structure as described in any one of claims 1 to 9.

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