Sealing structure, control valve structure, cover body assembly and cooking utensil

Abstract

The utility model provides a sealing structure, a control valve structure, a cover body assembly and a cooking utensil, and the sealing structure comprises a transmission rod which is provided with a mounting section; the first limiting part and the second limiting part are both arranged on the transmission rod and located on the two sides of the installation section respectively, a first divergent section is arranged on the side, away from the second limiting part, of the first limiting part, and a second divergent section is arranged on the side, away from the second limiting part, of the second limiting part in the direction from the first limiting part to the second limiting part. The distance between the first divergent section and the axis of the transmission rod is gradually increased; and the first sealing ring is mounted at the mounting section and is arranged between the first limiting part and the second limiting part in a limiting manner. According to the technical scheme, the problem that the sealing effect of the sealing ring is affected due to the fact that the position of the connecting shaft in the connecting hole is unstable in the prior art can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of small household appliances, and in particular to a sealing structure, a control valve structure, a cover assembly and a cooking utensil. Background Art

[0002] A sealing ring is a structure used to seal mechanical parts to prevent fluid leakage. Sealing rings are widely used in various industrial and mechanical fields. Types of sealing rings include O-rings, V-rings, U-rings, and X-rings.

[0003] In the related art, the sealing ring is connected to the connecting shaft, and the connecting shaft is passed through the connecting hole. The sealing ring can seal the connecting hole. When the connecting shaft moves in the connecting hole, the connecting shaft is prone to shake in the connecting hole. That is, when the connecting shaft shakes in the connecting hole, the sealing ring is prone to misalignment with the connecting hole, which in turn affects the sealing effect of the sealing ring. Utility Model Content

[0004] The main purpose of the present invention is to provide a sealing structure, a control valve structure, a cover assembly and a cooking utensil to solve the problem in the related art that the position of the connecting shaft in the connecting hole is unstable, which in turn affects the sealing effect of the sealing ring.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a sealing structure is provided, including: a transmission rod, the transmission rod is provided with an installation section; a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are both arranged on the transmission rod and are respectively located on both sides of the installation section, the first limiting portion has a first gradually expanding section on the side away from the second limiting portion, and the distance between the first gradually expanding section and the axis of the transmission rod gradually increases in the direction from the first limiting portion to the second limiting portion; a first sealing ring, installed at the installation section and limitedly set between the first limiting portion and the second limiting portion.

[0006] According to the technical solution of the present invention, a mounting section is provided on the transmission rod, and a first limiting portion and a second limiting portion are both provided on the transmission rod, located on either side of the mounting section. A first sealing ring is mounted on the mounting section and located between the first limiting portion and the second limiting portion. The first limiting portion has a first gradually expanding section on the side away from the second limiting portion. The distance between the first gradually expanding section and the axis of the transmission rod gradually increases from the first limiting portion to the second limiting portion. Through this arrangement, the first limiting portion and the second limiting portion can limit the position of the first sealing ring, thereby further stabilizing the position of the first sealing ring. Furthermore, due to the presence of the first gradually expanding section, when the transmission rod moves, the first gradually expanding section can guide and mate with the mating hole portion. That is, the distance between the centerline of the first gradually expanding section and the axis of the hole portion gradually decreases, thereby adjusting the positional correspondence between the transmission rod and the hole portion, thereby enabling the first sealing ring to effectively seal the hole portion. Therefore, the technical solution of the present application effectively solves the problem in the related art of unstable position of the connecting shaft within the connecting hole, which in turn affects the sealing effect of the sealing ring.

[0007] Furthermore, the first position-limiting portion includes a step and a stop. The step is located between the stop and the second position-limiting portion. Partially mateable with the step for the first sealing ring, the first gradually expanding section is disposed on the stop. The step mates with the first sealing ring, thereby increasing the contact area between the first sealing ring and the first position-limiting portion, thereby further stabilizing the position of the first sealing ring.

[0008] Furthermore, the first sealing ring has an inner hole, and is provided with a first mounting opening in communication with the inner hole. The diameter of the first mounting opening is larger than the diameter of the inner hole, and the axis of the inner hole, the axis of the first mounting opening, and the axis of the first sealing ring are collinearly arranged, and the step portion is inserted into the first mounting opening. The mounting section is provided in the inner hole, and the step portion is inserted into the first mounting opening, thereby ensuring a relatively stable relative position between the first sealing ring and the first limiting portion.

[0009] Furthermore, the first sealing ring is provided with a second mounting opening that communicates with the inner hole. The diameter of the second mounting opening is larger than that of the inner hole. The second mounting opening and the first mounting opening are arranged on opposite sides of the inner hole, and the axis of the second mounting opening is arranged collinearly with the axis of the first mounting opening. The second limiting portion is inserted into the second mounting opening. This arrangement can ensure a relatively stable relative position between the first sealing ring and the second limiting portion. Specifically, the second limiting portion can cooperate with the inner wall of the second mounting opening to limit the position, and can also cooperate with the side wall of the second mounting opening to limit the position.

[0010] Furthermore, the sealing structure further includes a third limiting portion, a fourth limiting portion, and a second sealing ring. The third limiting portion and the fourth limiting portion are spaced apart on the transmission rod, and the second sealing ring is disposed between the third limiting portion and the fourth limiting portion. The third limiting portion is located between the first limiting portion and the fourth limiting portion, and a space is provided between the third limiting portion and the first limiting portion. The third limiting portion and the fourth limiting portion can limit the position of the second sealing ring, thereby further stabilizing the position of the second sealing ring.

[0011] Furthermore, a second gradually expanding section is provided on a side of the fourth limiting portion away from the third limiting portion. The distance between the second gradually expanding section and the axis of the transmission rod gradually increases from the fourth limiting portion to the third limiting portion. The provision of the second gradually expanding section further serves as a guide, thereby further ensuring the stability of the relative position of the transmission rod and the hole when used in conjunction with the first gradually expanding section.

[0012] Furthermore, the second sealing ring includes an annular body and an annular lip connected to the outer circumference of the annular body. The outer circumferences of the third and fourth limiting portions are both circular. The cross-sectional area of the third limiting portion is smaller than that of the annular body, and the outer diameter of the third limiting portion is less than or equal to the outer diameter of the annular body. The provision of the annular lip can enhance the sealing effect, and the dimensional relationship between the third limiting portion and the annular body ensures that the annular lip has sufficient room for deformation.

[0013] According to the second aspect of the present application, a control valve structure is provided, comprising: a valve body having a valve cavity, an inlet connected to the valve cavity, and a first outlet connected to the valve cavity; a transmission rod of a sealing structure movably disposed in the first outlet, and a first sealing ring of the sealing structure capable of blocking the first outlet or opening the first outlet, wherein the sealing structure is the above-mentioned sealing structure. Under the action of the first gradually expanding section, the above-mentioned sealing structure can make the axis of the transmission rod and the axis of the first outlet close to each other, thereby stabilizing the relative position of the transmission rod and the first outlet. Therefore, the control valve structure having the above-mentioned sealing structure also has the above-mentioned advantages.

[0014] Furthermore, the valve body is provided with a mounting hole, and the control valve structure further includes a mounting tube, which is mounted within the mounting hole. The interior of the mounting tube forms a second outlet, and the second sealing ring of the sealing structure can block the second outlet or avoid the second outlet. The second sealing ring is mounted within the valve body through the mounting hole, and the mounting tube is then mounted in the mounting hole, so that the second sealing ring can block or avoid the second outlet.

[0015] Furthermore, the mounting cylinder includes a cylinder body and a connecting portion connected to a first end of the cylinder body. The connecting portion is connected between the first end of the cylinder body and the valve body. The second end of the cylinder body extends into the valve cavity and engages with the second sealing ring. The provision of the connecting portion can further stabilize the connection between the mounting cylinder and the valve body.

[0016] Further, the maximum diameter of the second sealing ring is greater than the maximum diameter of the tube body, and / or the inboard of the second end of the tube body is provided with an arcuate edge. Above-mentioned second sealing ring can effectively seal the second outlet. The second end of the tube body can contact and cooperate with the second sealing ring, and the arcuate edge can prevent the tube body from scratching the second sealing ring.

[0017] According to a third aspect of the present invention, a cover assembly is provided, comprising a control valve structure, wherein the control valve structure is the control valve structure described above. The control valve structure described above can ensure a good sealing effect, and thus the cover assembly having the control valve structure described above also has the above advantages.

[0018] According to a fourth aspect of the present invention, a cooking utensil is provided, comprising a cover assembly, wherein the cover assembly is the above-mentioned cover assembly. The control valve structure of the above-mentioned cover assembly can align the transmission rod with the first outlet and the transmission rod with the second outlet, thereby ensuring a blocking effect. Therefore, the cooking utensil having the above-mentioned cover assembly also has the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the sealing structure according to the present utility model is shown;

[0021] Figure 2 Shown Figure 1 A schematic cross-sectional view of a sealing structure;

[0022] Figure 3 Shown Figure 1 A schematic diagram of the three-dimensional structure of the first sealing ring of the sealing structure;

[0023] Figure 4 Shown Figure 3 a schematic cross-sectional view of a first sealing ring;

[0024] Figure 5 A cross-sectional schematic diagram of an embodiment of a control valve structure according to the present utility model is shown;

[0025] Figure 6 Shown Figure 5 A cross-sectional schematic diagram of the sealing structure of the control valve structure blocking the first outlet and the second outlet.

[0026] The above drawings include the following reference numerals:

[0027] 10. Transmission rod; 11. Mounting section; 20. First limiting portion; 21. First gradually expanding section; 22. Step portion; 23. Stop portion; 30. Second limiting portion; 40. First sealing ring; 41. Inner hole; 42. First mounting opening; 43. Second mounting opening; 51. Third limiting portion; 52. Fourth limiting portion; 521. Second gradually expanding section; 53. Second sealing ring; 60. Valve body; 61. Valve cavity; 62. Inlet; 63. First outlet; 64. Mounting hole; 70. Mounting cylinder; 71. Second outlet; 72. Cylinder body; 73. Connecting portion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] like Figure 1 and Figure 2As shown, in this embodiment, the sealing structure includes: a transmission rod 10, a first limiting portion 20, a second limiting portion 30, and a first sealing ring 40. The transmission rod 10 is provided with a mounting section 11. The first limiting portion 20 and the second limiting portion 30 are both arranged on the transmission rod 10 and are respectively located on both sides of the mounting section 11. The first limiting portion 20 has a first gradually expanding section 21 on the side away from the second limiting portion 30. The distance between the first gradually expanding section 21 and the axis of the transmission rod 10 gradually increases from the first limiting portion 20 to the second limiting portion 30. The first sealing ring 40 is installed at the mounting section 11 and is limitedly arranged between the first limiting portion 20 and the second limiting portion 30.

[0032] Applying the technical solution of this embodiment, a mounting section 11 is provided on the transmission rod 10, and a first limiting portion 20 and a second limiting portion 30 are both provided on the transmission rod 10 and are located on both sides of the mounting section 11. A first sealing ring 40 is installed at the mounting section 11 and is located between the first limiting portion 20 and the second limiting portion 30. The first limiting portion 20 has a first gradually expanding section 21 on the side away from the second limiting portion 30. The distance between the first gradually expanding section 21 and the axis of the transmission rod 10 gradually increases in the direction from the first limiting portion 20 to the second limiting portion 30. Through the above-mentioned arrangement, the first limiting portion 20 and the second limiting portion 30 can limit the first sealing ring 40, thereby making the position of the first sealing ring 40 more stable. At the same time, due to the presence of the first gradually expanding section 21, when the transmission rod 10 moves, the first gradually expanding section 21 can guide and cooperate with the matching hole portion, that is, the distance between the center line of the first gradually expanding section 21 and the axis of the hole portion gradually approaches, thereby adjusting the position correspondence between the transmission rod 10 and the hole portion, so that the first sealing ring 40 can effectively seal the hole portion. Therefore, the technical solution of this embodiment can effectively solve the problem in the related art that the position of the connecting shaft in the connecting hole is unstable, which in turn affects the sealing effect of the sealing ring. It should be noted that the first gradually expanding section 21 of this embodiment is a first conical surface, and the provision of the first conical surface can achieve a guiding effect.

[0033] like Figures 2 to 4 As shown, in this embodiment, the first position-limiting portion 20 includes a step portion 22 and a stop portion 23. The step portion 22 is located between the stop portion 23 and the second position-limiting portion 30. Part of the structure of the first sealing ring 40 contacts and cooperates with the step portion 22, and the first gradually expanding section 21 is provided on the stop portion 23. The step portion 22 cooperates with the first sealing ring 40, thereby increasing the contact area between the first sealing ring 40 and the first position-limiting portion 20, thereby further stabilizing the position of the first sealing ring 40.

[0034] like Figures 2 to 4As shown, in this embodiment, the first sealing ring 40 has an inner hole 41, and is provided with a first mounting opening 42 in communication with the inner hole 41. The diameter of the first mounting opening 42 is larger than the diameter of the inner hole 41. The axes of the inner hole 41, the first mounting opening 42, and the first sealing ring 40 are collinearly arranged, and the step portion 22 is inserted into the first mounting opening 42. The mounting section 11 is inserted into the inner hole 41, and the step portion 22 is inserted into the first mounting opening 42. This ensures that the relative position between the first sealing ring 40 and the first limiting portion 20 is relatively stable.

[0035] Preferably, the cross-sectional area of the second limiting portion 30 is smaller than the inner cross-sectional area of the second mounting opening 43. This can provide deformation space for the first sealing ring 40.

[0036] like Figures 2 to 4 As shown, in this embodiment, the first sealing ring 40 is further provided with a second mounting opening 43 that communicates with the inner hole 41. The diameter of the second mounting opening 43 is larger than that of the inner hole 41. The second mounting opening 43 and the first mounting opening 42 are arranged on opposite sides of the inner hole 41. The axis of the second mounting opening 43 and the axis of the first mounting opening 42 are arranged collinearly. The second limiting portion 30 is inserted into the second mounting opening 43. This arrangement ensures a relatively stable relative position between the first sealing ring 40 and the second limiting portion 30. Specifically, the second limiting portion 30 can engage with the inner wall of the second mounting opening 43 and can also engage with the sidewall of the second mounting opening 43.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the sealing structure further includes a third limiting portion 51, a fourth limiting portion 52, and a second sealing ring 53. The third limiting portion 51 and the fourth limiting portion 52 are spaced apart on the transmission rod 10, and the second sealing ring 53 is disposed between the third limiting portion 51 and the fourth limiting portion 52. The third limiting portion 51 is located between the first limiting portion 20 and the fourth limiting portion 52, and there is a gap between the third limiting portion 51 and the first limiting portion 20. The third limiting portion 51 and the fourth limiting portion 52 can limit the second sealing ring 53, thereby making the position of the second sealing ring 53 more stable.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, a second gradually expanding section 521 is provided on a side of the fourth limiting portion 52 away from the third limiting portion 51. The distance between the second gradually expanding section 521 and the axis of the transmission rod 10 gradually increases from the fourth limiting portion 52 to the third limiting portion 51. The provision of the second gradually expanding section 521 further serves as a guide, thereby further ensuring the stability of the relative position of the transmission rod 10 and the hole portion when engaged with the first gradually expanding section 21.

[0039] Preferably, the maximum outer diameter of the fourth limiting portion 52 is greater than the maximum outer diameter of the third limiting portion 51 .

[0040] It should be noted that the second gradually expanding section 521 in this embodiment is a second tapered surface, and the provision of the second tapered surface can achieve a guiding function.

[0041] The second sealing ring 53 comprises an annular body and an annular lip connected to the outer periphery of the annular body. The outer peripheries of the third limiting portion 51 and the fourth limiting portion 52 are both circular. The cross-sectional area of the third limiting portion 51 is smaller than that of the annular body, and the outer diameter of the third limiting portion 51 is equal to or less than the outer diameter of the annular body. The provision of the annular lip enhances the sealing effect, and the dimensional relationship between the third limiting portion 51 and the annular body ensures that the annular lip has sufficient room for deformation.

[0042] According to a second aspect of the present application, a control valve structure is provided, such as Figure 5 and Figure 6 As shown, the control valve structure of this embodiment includes: a valve body 60 having a valve cavity 61, an inlet 62 connected to the valve cavity 61, and a first outlet 63 connected to the valve cavity 61. The transmission rod 10 of the sealing structure is movably arranged in the first outlet 63, and the first sealing ring 40 of the sealing structure can block the first outlet 63 or open the first outlet 63, wherein the sealing structure is the above-mentioned sealing structure. Under the action of the first gradually expanding section 21, the above-mentioned sealing structure can make the axis of the transmission rod 10 and the axis of the first outlet 63 close to each other, thereby stabilizing the relative position of the transmission rod 10 and the first outlet 63. Therefore, the control valve structure with the above-mentioned sealing structure also has the above-mentioned advantages.

[0043] like Figure 5 and Figure 6 As shown, in this embodiment, the valve body 60 is provided with a mounting hole 64, and the control valve structure further includes a mounting cylinder 70. The mounting cylinder 70 is mounted in the mounting hole 64. The interior of the mounting cylinder 70 forms a second outlet 71. The second sealing ring 53 of the sealing structure can block the second outlet 71 or avoid the second outlet 71. The second sealing ring 53 is installed in the interior of the valve body 60 through the mounting hole 64, and the mounting cylinder 70 is then installed in the mounting hole 64. In this way, the second sealing ring 53 can block or avoid the second outlet 71.

[0044] like Figure 5 and Figure 6As shown, in this embodiment, the mounting cylinder 70 includes a cylinder body 72 and a connecting portion 73 connected to a first end of the cylinder body 72. The connecting portion 73 is connected between the first end of the cylinder body 72 and the valve body 60. The second end of the cylinder body 72 extends into the valve cavity 61 and cooperates with the second sealing ring 53. The provision of the connecting portion 73 can make the connection between the mounting cylinder 70 and the valve body 60 more stable.

[0045] Specifically, in this embodiment, the maximum outer diameter of the fourth limiting portion 52 is smaller than the inner diameter of the barrel body 72 .

[0046] like Figure 5 and Figure 6 As shown, in this embodiment, the connecting portion 73 includes a first connecting member and a second connecting member, the first connecting member is connected to the first end of the cylinder body 72 and extends away from the center of the cylinder body 72, and the second connecting member is connected between the first connecting member and the valve body 60.

[0047] like Figure 5 and Figure 6 As shown, in this embodiment, the mounting cylinder 70 includes a plurality of mounting cylinders, and each mounting cylinder 70 has a second outlet 71 with a different diameter.

[0048] like Figure 5 and Figure 6 As shown, in this embodiment, the maximum diameter of the second sealing ring 53 is larger than the maximum diameter of the cylinder body 72, and an arcuate edge is provided on the inner side of the second end of the cylinder body 72. The second sealing ring 53 can effectively seal the second outlet 71. The second end of the cylinder body 72 can contact and cooperate with the second sealing ring 53, and the arcuate edge can prevent the cylinder body 72 from scratching the second sealing ring 53.

[0049] Specifically, the arcuate edge is connected between the inner wall of the barrel body 72 and the end wall of the second end of the barrel body 72 .

[0050] Preferably, the end wall of the second end of the cylinder body 72 is a smooth surface, which can further prevent the second sealing ring 53 from being scratched.

[0051] According to a third aspect of the present application, a cover assembly is provided. The cover assembly of this embodiment includes a control valve structure, which is the control valve structure described above. The control valve structure described above can ensure a good sealing effect, and thus the cover assembly having the control valve structure described above also has the above advantages.

[0052] According to a fourth aspect of the present application, a cooking appliance is provided, comprising a cover assembly, wherein the cover assembly is the above-mentioned cover assembly. The control valve structure of the above-mentioned cover assembly can achieve alignment of the transmission rod 10 with the first outlet 63 and the second outlet 71, thereby ensuring a blocking effect. Therefore, the cooking appliance having the above-mentioned cover assembly also has the above-mentioned advantages.

[0053] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sealing structure, characterized in that: include: A transmission rod (10), wherein the transmission rod (10) is provided with a mounting section (11); a first limiting portion (20) and a second limiting portion (30), wherein the first limiting portion (20) and the second limiting portion (30) are both arranged on the transmission rod (10) and are respectively located on both sides of the mounting section (11); a first gradually expanding section (21) is provided on a side of the first limiting portion (20) away from the second limiting portion (30); and a distance between the first gradually expanding section (21) and the axis of the transmission rod (10) gradually increases in a direction from the first limiting portion (20) to the second limiting portion (30); A first sealing ring (40) is installed at the installation section (11) and is limitedly disposed between the first limiting portion (20) and the second limiting portion (30).

2. The sealing structure according to claim 1, wherein: The first limiting portion (20) comprises a step portion (22) and a stop portion (23); the step portion (22) is located between the stop portion (23) and the second limiting portion (30); a portion of the structure of the first sealing ring (40) is in contact with and engaged with the step portion (22); and the first gradually expanding section (21) is arranged on the stop portion (23).

3. The sealing structure according to claim 2, characterized in that: The first sealing ring (40) has an inner hole (41), and a first mounting opening (42) communicating with the inner hole (41) is provided on the first sealing ring (40). The diameter of the first mounting opening (42) is larger than the diameter of the inner hole (41). The axis of the inner hole (41), the axis of the first mounting opening (42) and the axis of the first sealing ring (40) are collinearly arranged, and the step portion (22) is inserted into the first mounting opening (42).

4. The sealing structure according to claim 3, characterized in that: The first sealing ring (40) is further provided with a second mounting opening (43) connected to the inner hole (41); the diameter of the second mounting opening (43) is larger than the diameter of the inner hole (41); the second mounting opening (43) and the first mounting opening (42) are arranged on opposite sides of the inner hole (41); the axis of the second mounting opening (43) and the axis of the first mounting opening (42) are arranged collinearly; and the second limiting portion (30) is inserted into the second mounting opening (43).

5. The sealing structure according to any one of claims 1 to 4, characterized in that: The sealing structure further comprises a third limiting portion (51), a fourth limiting portion (52) and a second sealing ring (53); the third limiting portion (51) and the fourth limiting portion (52) are arranged on the transmission rod (10) at intervals; the second sealing ring (53) is arranged between the third limiting portion (51) and the fourth limiting portion (52); the third limiting portion (51) is located between the first limiting portion (20) and the fourth limiting portion (52); and there is an interval between the third limiting portion (51) and the first limiting portion (20).

6. The sealing structure according to claim 5, characterized in that: A second gradually expanding section (521) is provided on a side of the fourth limiting portion (52) away from the third limiting portion (51), and the distance between the second gradually expanding section (521) and the axis of the transmission rod (10) gradually increases in a direction from the fourth limiting portion (52) to the third limiting portion (51).

7. The sealing structure according to claim 5, characterized in that: The second sealing ring (53) includes an annular body and an annular lip connected to the outer periphery of the annular body. The outer peripheries of the third limiting portion (51) and the fourth limiting portion (52) are both circular. The cross-sectional area of the third limiting portion (51) is smaller than the cross-sectional area of the annular body. The outer diameter of the third limiting portion (51) is smaller than or equal to the outer diameter of the annular body.

8. A control valve structure, characterized in that: include: A valve body (60), the valve body (60) having a valve cavity (61), an inlet (62) communicating with the valve cavity (61), and a first outlet (63) communicating with the valve cavity (61); The transmission rod (10) of the sealing structure is movably arranged in the first outlet (63), and the first sealing ring (40) of the sealing structure can block the first outlet (63) or open the first outlet (63), wherein the sealing structure is the sealing structure according to any one of claims 1 to 7.

9. The control valve structure according to claim 8, characterized in that: The valve body (60) is provided with a mounting hole (64), and the control valve structure further includes a mounting cylinder (70). The mounting cylinder (70) is installed in the mounting hole (64), and a second outlet (71) is formed inside the mounting cylinder (70). The second sealing ring (53) of the sealing structure can block the second outlet (71) or avoid the second outlet (71).

10. The control valve structure according to claim 9, characterized in that: The mounting cylinder (70) includes a cylinder body (72) and a connecting portion (73) connected to the first end of the cylinder body (72), the connecting portion (73) is connected between the first end of the cylinder body (72) and the valve body (60), and the second end of the cylinder body (72) extends into the valve cavity (61) and cooperates with the second sealing ring (53).

11. The control valve structure according to claim 10, characterized in that: The maximum diameter of the second sealing ring (53) is greater than the maximum diameter of the barrel body (72), and / or an arc-shaped edge is provided on the inner side of the second end of the barrel body (72).

12. A cover assembly, comprising a control valve structure, characterized in that: The control valve structure is the control valve structure according to any one of claims 8 to 11.

13. A cooking utensil comprising a cover assembly, characterized in that: The cover assembly is the cover assembly according to claim 12.

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