Sealing structure

Abstract

The utility model discloses a sealing structure which comprises a sealing plug and an opponent piece. The sealing plug comprises a nut and a screw rod, a plugging groove is formed in the nut, and the plugging groove is sunken towards one side of the top surface of the nut along the bottom surface of the nut; the nut comprises a first face and a second face which are opposite in the direction perpendicular to the length direction of the screw, and the second face is located on the side, close to the plugging groove, of the first face. Along the direction that the nut points to one side of the screw, the second surface inclines to the first surface to form a first inclined surface; the opponent piece comprises a connecting part connected with the screw rod, the connecting part comprises a joint section and a connecting section connected with the joint section, and the joint section is located on the side, away from the screw rod, of the connecting section; a second inclined plane matched with the first inclined plane is arranged on the outer surface of the connecting section, and the first inclined plane is in contact with the second inclined plane. According to the utility model, the first inclined surface and the second inclined surface are in sealing contact, and a sealing ring or a copper pad can be omitted, so that a sealing ring mold or a copper pad mold does not need to be opened independently, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screw plugs, and more specifically, to a sealing structure. Background Art

[0002] A sealing structure is a mechanical fastener mainly used for sealing. It can be used in media such as water, oil, and steam to seal pipelines or containers. The design of the sealing structure includes a convex plug, a conical shell, a reduced-diameter section, a flat cover, and a tightened mouth, etc., which ensure its sealing performance and applicability.

[0003] Currently, the sealing structure uses a sealing ring or a copper gasket for sealing. The selection of these sealing methods is usually based on their specific application requirements and performance characteristics. The sealing rings include ED rings and O-rings. The ED ring is an industrial sealing part and is a special sealing part for pneumatic and hydraulic joints such as pipe joints, hydraulic plugs, and transition joints. It has a better sealing effect than the traditional O-ring. This elastomeric sealing part is used as an axial static seal. For example, ED rings and O-rings are widely used because of their simplicity, ease of use, and cost-effectiveness. They are usually used at the joints that need to be sealed, such as pipelines and valves, to prevent fluid leakage. The copper gasket sealing is also widely used in some special application scenarios due to its good sealing performance and corrosion resistance. However, using the above sealing methods requires separately opening a sealing ring mold or a copper gasket mold, which increases the cost, and there is also a risk of dropping when taking the ED ring, O-ring, or copper gasket during assembly.

[0004] Therefore, providing a sealing structure that eliminates the sealing ring or copper gasket when the sealing screw plug is assembled to the mating part is a technical problem that urgently needs to be solved in the art. Summary of the Utility Model

[0005] In view of this, the utility model provides a sealing structure to solve the problem of eliminating the sealing ring or copper gasket when the sealing screw plug is assembled to the mating part.

[0006] This application provides a sealing structure, including: a sealing screw plug and a mating part;

[0007] The sealing screw plug includes a nut and a screw rod connected to the nut. A plugging groove is formed on the nut. The plugging groove is recessed from the bottom surface of the nut to one side of the top surface of the nut and is arranged around the screw rod;

[0008] Along the direction perpendicular to the length direction of the screw rod, the nut includes opposite first and second surfaces. The second surface is located on the side of the first surface close to the plugging groove; along the direction from the nut pointing to the screw rod, the second surface is inclined towards the first surface to form a first inclined surface;

[0009] The opposing member includes a connecting portion connected to the screw rod. The connecting portion includes an engaging section and a connecting section connected to the engaging section. The engaging section is located on the side of the connecting section away from the screw rod.

[0010] A second inclined surface matching the first inclined surface is provided on the outer surface of the connecting section, and the first inclined surface is in contact with the second inclined surface.

[0011] Optionally, a first obtuse angle is formed between the bottom of the plugging groove and the first inclined surface.

[0012] Optionally, the angle range of the first obtuse angle is 92.9° - 93.1°.

[0013] Optionally, along the length direction perpendicular to the screw rod, the connecting portion includes an opposite third surface and a fourth surface. The third surface is located on the side of the fourth surface away from the screw rod. Along the direction from the screw rod to the nut side, the third surface is inclined towards the fourth surface to form the second inclined surface.

[0014] A second obtuse angle is formed between the top surface of the engaging section and the second inclined surface.

[0015] Optionally, the angle range of the second obtuse angle is 92.9° - 93.1°.

[0016] Optionally, along the length direction of the screw rod, the length of the second inclined surface is greater than the length of the first inclined surface.

[0017] Optionally, the nut includes a first part and a second part connected to the first part. The second part surrounds the first part, and the shape of the second part is annular.

[0018] The first surface and the second surface are located on the second part.

[0019] Optionally, along the length extension direction of the screw rod, the first inclined surface includes an opposite first end point and a second end point. The first end point is located on the side away from the first part. The thickness between the first end point and the first surface is a, and the thickness between the second end point and the first surface is b. The ratio of b to a is 1.5 - 3.

[0020] Optionally, along the length direction of the screw rod, the length range of the first inclined surface is 4 mm - 6 mm.

[0021] Optionally, the roughness of the first inclined surface and the second inclined surface does not exceed 1.6.

[0022] Compared with the prior art, the sealing structure provided by the present utility model at least achieves the following beneficial effects:

[0023] The sealing structure provided by the present utility model includes: a sealing plug and a mating member; the sealing plug includes a nut and a screw rod connected to the nut, a plugging groove is formed on the nut, the plugging groove is recessed from the bottom surface of the nut towards one side of the top surface of the nut, and the plugging groove is arranged around the screw rod; along the direction perpendicular to the length direction of the screw rod, the nut includes opposite first and second surfaces, the second surface is located on the side of the first surface close to the plugging groove; along the direction from the nut towards the screw rod, the second surface is inclined towards the first surface to form a first inclined surface; the mating member includes a mating body and a connecting portion connected to the mating body, the connecting portion is located on the side of the mating body close to the screw rod, the connecting portion is connected to the screw rod, the connecting portion includes a joint section and a connecting section connected to the joint section, the joint section is located on the side of the connecting section away from the mating body; a second inclined surface matching with the first inclined surface is arranged on the outer surface of the connecting section, and the first inclined surface is in contact with the second inclined surface. Through the adaptation between the first inclined surface and the second inclined surface, the first inclined surface and the second inclined surface are in sealing contact, so that the sealing ring or copper gasket can be cancelled, thus eliminating the need to separately open a sealing ring mold or a copper gasket mold, thereby reducing costs, and at the same time, there is no risk of the sealing ring and copper gasket falling off during assembly.

[0024] Of course, it is not necessarily required that any product implementing the present utility model simultaneously achieves all the above-mentioned technical effects.

[0025] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0027] Figure 1 is a schematic structural diagram of a sealing structure provided by the present utility model;

[0028] Figure 2 is Figure 1 a schematic cross-sectional view taken along line A-A' in

[0029] Figure 3 is a schematic structural diagram of a sealing nut provided by the present utility model;

[0030] Figure 4 is Figure 3 a schematic cross-sectional view taken along line B-B' in

[0031] Figure 5 is Figure 4 The partial enlarged view at position D in

[0032] Figure 6 is the schematic structural view of a pair of opposing parts provided by the present utility model;

[0033] Figure 7 is Figure 6 The sectional view taken along C - C' in

[0034] Figure 8 is Figure 7 The partial enlarged view at position E in Specific embodiments

[0035] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model or its application or use.

[0037] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0038] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that: Like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] Referring to Figures 1-7 as shown Figure 1 is the schematic structural view of a sealing structure provided by the present utility model; Figure 2 is Figure 1 The sectional view taken along A - A' in Figure 3 is the schematic structural view of a sealing nut provided by the present utility model; Figure 4 is Figure 3 The sectional view taken along B - B' in Figure 5 is Figure 4 The partial enlarged view at position D in Figure 6 is the schematic structural view of a pair of opposing parts provided by the present utility model; Figure 7 is Figure 6 The sectional view taken along C - C' inFigure 8 Yes Figure 7 It is a partially enlarged view at position E in the figure. This embodiment provides a sealing structure, including: a sealing plug 1 and a mating part 2;

[0041] The sealing plug 1 includes a nut 10 and a screw rod 11. A plugging groove 13 is formed on the nut 10. The plugging groove 13 is recessed from the bottom surface of the nut 10 towards one side of the top surface of the nut 10, and the plugging groove 13 is arranged around the screw rod 11;

[0042] Along the direction perpendicular to the length direction of the screw rod 11, the nut 10 includes opposite first surface 101 and second surface 102, and the second surface 102 is located on the side of the first surface 101 close to the plugging groove 13; Along the direction from the nut 10 towards the screw rod 11, the second surface 102 is inclined towards the first surface 101 to form a first inclined surface 1021;

[0043] The mating part 2 includes a connecting portion 21 connected to the screw rod 11. The connecting portion 21 includes an engaging section 210 and a connecting section 211 connected to the engaging section 210, and the engaging section 210 is located on the side of the connecting section 211 away from the screw rod 11;

[0044] A second inclined surface 2113 matching the first inclined surface 1021 is arranged on the outer surface of the connecting section 211, and the first inclined surface 1021 is in contact with the second inclined surface 2113.

[0045] Specifically, as shown in combination with Figure 1 and Figure 2 , the sealing structure in this embodiment includes a sealing plug 1 and a mating part 2; The sealing plug 1 and the mating part 2 play crucial roles in the sealing structure. The sealing plug 1 is usually used to close or block a certain space to prevent fluid or impurities from leaking out of the space. Its function is to tightly fit at the interface through threads or other fastening methods to form an effective barrier to prevent fluid from passing through. The mating part 2 is a component that cooperates with the sealing plug 1, and its function is to form a tight contact with the sealing plug 1 to jointly prevent fluid leakage. The sealing plug 1 and the mating part 2 jointly constitute the core part of the sealing structure through their tight cooperation, ensuring the sealing performance and safety of the system.

[0046] Continue to refer to Figure 3 and Figure 4 shown, the sealing plug 1, which includes: a nut 10 and a screw rod 11. The nut 10 is used to block dust and pollutants, thereby protecting the screw rod 11 from damage; The screw rod 11 is used for sealing and fixing; The nut 10 is connected to the screw rod 11. The nut 10 and the screw rod 11 can be an integral structure or a combined structure, designed according to actual needs. When the nut 10 and the screw rod 11 adopt an integral structure, it is convenient for subsequent installation and use.

[0047] The nut 10 is provided with a plugging groove 13 which is arranged around the screw rod 11. The plugging groove 13 is recessed from the bottom surface of the nut 10 towards one side of the top surface of the nut 10. The plugging groove 13 is arranged around the screw rod 11. The plugging groove 13 can be an annular groove, which is beneficial to sealing the screw plug 1 screwed into the mating part 2, thereby improving its sealing performance and effectively preventing leakage.

[0048] See Figure 4 As shown, along the direction perpendicular to the length direction of the screw rod 11, the nut 10 includes opposite first surface 101 and second surface 102. There is a certain thickness between the first surface 101 and the second surface 102. The second surface 102 is located on the side of the first surface 101 close to the plugging groove 13. The first surface 101 and the second surface 102 can be respectively circular ring structures. Among them, the first surface 101 can be the outer peripheral surface of the circular ring structure, and the second surface 102 can be the inner peripheral surface of the circular ring structure. The first surface 101 and the second surface 102 are respectively curved surfaces; along the direction from the nut 10 towards the screw rod 11, the second surface 102 is inclined towards the first surface 101 to form a first inclined surface 1021. It can be understood that the inner surface is inclined towards the outer surface to form the first inclined surface 1021.

[0049] Combined with Figure 6 and Figure 7 As shown, the mating part 2 includes a mating body 22 and a connecting part 21. The mating body 22 and the connecting part 21 can be an integral structure or a combined structure, which is designed according to actual needs. When the mating body 22 and the connecting part 21 adopt an integral structure, it is convenient for subsequent installation and use.

[0050] The connecting part 21 is located on the side of the mating body 22 close to the screw rod 11. The inner surface of the connecting part 21 is provided with an internal thread 213, and the outer part of the screw rod 11 is provided with an external thread 110 that matches the internal thread 213. The internal thread 213 and the external thread 110 are threadedly connected to connect the screw rod 11 and the connecting part 21 together, which has the advantages of simple structure, reliable connection, convenient installation and disassembly, etc.

[0051] The connecting part 21 includes a joint section 210 and a connecting section 211. The side of the joint section 210 close to the connecting section 211 is connected to the side of the connecting section 211 close to the joint section 210. The joint section 210 is located on the side of the connecting section 211 away from the mating body 22. The joint section 210 is used to contact the nut 10; the outer surface of the connecting section 211 is provided with a second inclined surface 2113 that matches the first inclined surface 1021. The first inclined surface 1021 and the second inclined surface 2113 are in sealing contact, which can eliminate the sealing ring or copper gasket, so there is no need to separately open a sealing ring mold or copper gasket mold, thereby reducing costs. At the same time, there is no risk of the sealing ring and copper gasket falling during assembly.

[0052] In the above solution: continue to refer to Figure 1As shown, the process flow of the sealed plug 1 includes cold heading, thread rolling forming, and surface zinc plating treatment, while the counterpart 2 is produced by mechanical processing to ensure precise fit with the sealed plug 1.

[0053] In some alternative embodiments, a first obtuse angle θ1 is formed between the bottom of the plugging groove 13 and the first inclined surface 1021.

[0054] Specifically, continue to refer to Figure 4 As shown, a first obtuse angle θ1 is formed between the bottom of the plugging groove 13 and the first inclined surface 1021. When the sealed plug 1 is threadedly connected to the counterpart 2, it is beneficial to form a sealed mating surface between the sealed plug 1 and the counterpart 2.

[0055] The inventor found that: if the first obtuse angle θ1 is too large, there will be a gap in the sealed mating surface, resulting in a decrease in sealing performance. If the angle of the first obtuse angle θ1 is too small, it will not only cause difficulties in manufacturing the sealing structure but also may increase production costs. Optionally, in this embodiment, the angle range of the first obtuse angle θ1 is designed to be 92.9° - 93.1°. This can not only avoid gaps in the sealed mating surface and ensure close contact of the sealed mating surface, but also reduce the manufacturing difficulty of the sealing structure and lower production costs. Specifically, the angle of the first obtuse angle θ1 can be 92.9°, 93.0°, or 93.1°.

[0056] In some alternative embodiments, in combination with Figure 7 and Figure 8 , along the length direction perpendicular to the screw 11, the connecting portion 21 includes opposite third surface 2110 and fourth surface 2112. The third surface 2110 is located on the side of the fourth surface 2112 away from the screw 11. It can be understood that along the length direction perpendicular to the screw 11, the third surface 2110 is the outer side surface of the joint segment 210, and the fourth surface 2112 can be the inner thread surface where the joint segment 210 contacts the screw 11. The third surface 2110 is inclined towards the fourth surface 2112 to form a second inclined surface 2113, and the second inclined surface 2113 is adapted to the first inclined surface 1021;

[0057] A second obtuse angle is formed between the top surface of the joint segment 210 and the second inclined surface 2113. By making the second inclined surface 2113 adapted to the first inclined surface 1021, a sealed mating surface is formed between the nut 10 and the joint segment 210, thereby improving the sealing performance between the sealed plug 1 and the counterpart 2.

[0058] Optionally, the angle range of the second obtuse angle θ2 is 92.9° - 93.1°. This can not only avoid gaps in the sealed mating surface and ensure close contact of the sealed mating surface, but also reduce the manufacturing difficulty of the sealing structure and lower production costs. Specifically, the angle of the second obtuse angle θ2 can be 92.9°, 93.0°, or 93.1°.

[0059] In an alternative embodiment, in combination with Figure 2 , Figure 4 and Figure 8 as shown, along the length direction of the screw 11, the length of the second inclined surface 2113 is greater than that of the first inclined surface 1021. By adopting the above solution, the sealing joint surface between the mating part 2 and the sealing structure can be lifted, effectively reducing or avoiding the risk of seal leakage.

[0060] In some alternative embodiments, the nut 10 includes a first part 10a and a second part 10b connected to the first part 10a. The second part 10b is disposed around the first part 10a, and the shape of the second part 10b is annular; the first surface 101 and the second surface 102 are located on the second part 10b.

[0061] Specifically, continuing to refer to Figure 4 as shown, the nut 10 includes a first part 10a and a second part 10b. The shape of the first part 10a can be circular, and the shape of the second part 10b can be annular. The top surface of the first part 10a is flush with the top surface of the second part 10b. The first part 10a is connected to the second part 10b. The first surface 101 and the second surface 102 are located on the second part 10b. The length extension direction of the second surface 102 can intersect with the length extension direction of the first surface 101. A sealing fit surface is formed between the second part 10b and the mating part 2, thereby improving the sealing effect between the sealing plug 1 and the mating part 2.

[0062] It should be noted that: continuing to refer to Figure 4 as shown, designed according to actual needs, the first part 10a and the second part 10b can be an integral structure or a combined structure. When the first part 10a and the second part 10b adopt an integral structure, subsequent assembly and disassembly are very convenient, and the cost is relatively low at the same time. This integral structure can effectively seal the pipe orifice and prevent the leakage of liquid or gas.

[0063] In an alternative embodiment, along the length extension direction of the screw 11, the first inclined surface 1021 includes opposite first and second end points 1021a and 1021b. The first end point 1021a is located on the side away from the first part 10a. The thickness between the first end point 1021a and the first surface 101 is a, and the thickness between the second end point 1021b and the first surface 101 is b. The ratio of b to a is 1.5 - 3.

[0064] The inventor found that when the sealing structure is in interference fit with the mating part 2, if the ratio of b to a is too low, there is a risk of cracking the sealing plug 1 during the tightening process; if the ratio of b to a is too high, the weight of the sealing plug 1 will increase. Optionally, in this embodiment, the ratio of b to a is 1.5 - 3, which can not only avoid the risk of cracking the sealing plug 1 during the tightening process, but also reduce the weight of the sealing plug 1 and improve the portability of the sealing plug 1.

[0065] The inventor found that if the length of the first inclined surface 1021 is too short along the length direction of the screw 11, there is a risk of leakage in the sealing structure. If the length of the first inclined surface 1021 is too long along the length direction of the screw 11, the manufacturing difficulty will increase and the production cost may also increase. Optionally, in combination with Figure 4 and Figure 5 As shown, in this embodiment, along the length direction of the screw 11, the length range of the first inclined surface 1021 can be designed to be 4 mm - 6 mm, which can not only reduce the leakage risk of the sealing structure, but also reduce the manufacturing difficulty and production cost at the same time. Specifically, along the length direction of the screw 11, the length of the first inclined surface 1021 can be 4 mm, 5 mm or 6 mm.

[0066] If the roughness of the first inclined surface 1021 and the second inclined surface 2113 exceeds the specified roughness, the gap at the microscopic level will increase during the tightening and screwing together of the sealing structure and the mating part 2, which may then lead to seal leakage. Optionally, in combination with Figure 4 and Figure 8 As shown, in this embodiment, the roughness of the first inclined surface 1021 and the second inclined surface 2113 does not exceed 1.6 microns, which can meet the required surface roughness requirements, avoid the increase of the gap at the microscopic level during the tightening and screwing together of the sealing structure and the mating part 2, and ensure good contact and sealing performance between the sealing structure and the mating part 2 during the tightening and screwing together process.

[0067] As can be seen from the above embodiments, the sealing structure provided by the present utility model has at least achieved the following beneficial effects:

[0068] The sealing structure provided by the present utility model includes a sealing plug 1 and a mating member 2. The sealing plug 1 includes a nut 10 and a screw rod 11 connected to the nut 10. A plugging groove 13 is formed in the nut 10. The plugging groove 13 is arranged around the screw rod 11 and is recessed from the bottom surface of the nut 10 towards one side of the top surface of the nut 10. The plugging groove 13 is arranged around the screw rod 11. Along the direction perpendicular to the length direction of the screw rod 11, the nut 10 includes opposite first surface 101 and second surface 102. The second surface 102 is located on the side of the first surface 101 close to the plugging groove 13. Along the direction from the nut 10 towards the screw rod 11, the second surface 102 is inclined towards the first surface 101 to form a first inclined surface 1021. The mating member 2 includes a mating body 22 and a connecting portion 21 connected to the mating body 22. The connecting portion 21 is located on the side of the mating body 22 close to the screw rod 11. The connecting portion 21 is connected to the screw rod 11. The connecting portion 21 includes an engaging section 210 and a connecting section 211 connected to the engaging section 210. The engaging section 210 is located on the side of the connecting section 211 away from the mating body 22. A second inclined surface 2113 adapted to the first inclined surface 1021 is provided on the outer surface of the connecting section 211. The first inclined surface 1021 is in contact with the second inclined surface 2113. Through the adaptation between the first inclined surface 1021 and the second inclined surface 2113, the first inclined surface 1021 and the second inclined surface 2113 are in sealing contact, so that the sealing ring or copper gasket can be cancelled, thus eliminating the need to separately open a sealing ring mold or a copper gasket mold, thereby reducing costs. At the same time, there is no risk of the sealing ring and copper gasket falling off during assembly.

[0069] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A sealing structure, characterized in that, Comprising: A sealing plug and a mating part; The sealing plug includes a nut and a screw rod connected to the nut. A plugging groove is formed in the nut. The plugging groove is recessed from the bottom surface of the nut towards one side of the top surface of the nut, and the plugging groove is arranged around the screw rod; In a direction perpendicular to the length direction of the screw rod, the nut includes opposite first and second surfaces. The second surface is located on the side of the first surface close to the plugging groove; in the direction from the nut towards the screw rod, the second surface is inclined towards the first surface to form a first inclined surface; The mating part includes a connecting portion connected to the screw rod. The connecting portion includes an engaging section and a connecting section connected to the engaging section. The engaging section is located on the side of the connecting section away from the screw rod; A second inclined surface mating with the first inclined surface is arranged on the outer surface of the connecting section, and the first inclined surface is in contact with the second inclined surface.

2. The sealing structure according to claim 1, wherein A first obtuse angle is formed between the bottom of the plugging groove and the first inclined surface.

3. The sealing structure according to claim 2, wherein The angle range of the first obtuse angle is 92.9° - 93.1°.

4. The sealing structure according to claim 1, characterized in that, In a direction perpendicular to the length direction of the screw rod, the connecting portion includes opposite third and fourth surfaces. The third surface is located on the side of the fourth surface away from the screw rod. In the direction from the screw rod towards the nut, the third surface is inclined towards the fourth surface to form the second inclined surface; A second obtuse angle is formed between the top surface of the engaging section and the second inclined surface.

5. The sealing structure according to claim 4, characterized in that, The angle range of the second obtuse angle is 92.9° - 93.1°.

6. The sealing structure according to claim 1, characterized in that, In the length direction of the screw rod, the length of the second inclined surface is greater than the length of the first inclined surface.

7. The sealing structure according to claim 1, characterized in that, The nut includes a first part and a second part connected to the first part. The second part is arranged around the first part, and the shape of the second part is annular; The first surface and the second surface are located on the second part.

8. The sealing structure according to claim 7, wherein, In the extending direction of the length of the screw rod, the first inclined surface includes opposite first and second end points. The first end point is located on the side away from the first part. The thickness between the first end point and the first surface is a, and the thickness between the second end point and the first surface is b. The ratio of b to a is 1.5 - 3.

9. The sealing structure according to claim 1, wherein, In the length direction of the screw rod, the length range of the first inclined surface is 4 mm - 6 mm.

10. The sealing structure according to claim 1, wherein The roughness of the first inclined surface and the second inclined surface does not exceed 1.6.

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