Sealing structure with multiple dustproof lips

Abstract

The utility model relates to the technical field of sealing structures, and provides a multi-dustproof-lip sealing structure which comprises an inner sealing body and an outer sealing body, the inner sealing body is arranged on the outer sealing body, the outer sealing body is provided with a main sealing part, the main sealing part is connected with the inner sealing body, and a sealing cavity is formed among the main sealing part, the inner sealing body and the outer sealing body. The sealing structure is characterized in that a plurality of auxiliary sealing parts are arranged on the main sealing part, are all located in the sealing cavity and are all in interference contact with the inner sealing body. By means of the technical scheme, the problems that in the prior art, an FB type double oil seal combination or a common dustproof muddy water prevention oil seal structure is prone to oil seal oil leakage, and the sealing performance of the oil seal structure is reduced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a sealing structure with multiple dustproof lips. Background Art

[0002] For the drive shaft hub oil seals of large and medium-sized tractors, especially rice field machines and other agricultural equipment operating in paddy fields, FB-type double oil seal combinations or ordinary dust and mud and water proof oil seal structures are usually used. When working in harsh environments, impurities such as straw debris and dust can easily enter the sealing lip through the dust-proof side of the oil seal, causing oil leakage, reducing the sealing performance of the oil seal structure, and directly affecting the working efficiency of the mechanical equipment. Utility Model Content

[0003] The utility model proposes a multi-dustproof lip sealing structure, which solves the problem that the FB type double oil seal combination or the common dust and mud water proof oil seal structure in the related art is prone to oil leakage and reduces the sealing performance of the oil seal structure.

[0004] The technical solution of the utility model is as follows:

[0005] Multiple dust lip seal structure, including:

[0006] An inner sealing body and an outer sealing body, wherein the inner sealing body is arranged on the outer sealing body, the outer sealing body has a main sealing part, the main sealing part abuts against the inner sealing body, and a sealing cavity is formed between the main sealing part, the inner sealing body and the outer sealing body, and further comprises:

[0007] A plurality of secondary sealing parts are provided on the main sealing part, the plurality of secondary sealing parts are all located in the sealing cavity, and the plurality of secondary sealing parts are all in interference contact with the inner sealing body.

[0008] As a further technical solution, the inner sealing body is used to abut against the rotating shaft, and the inner sealing body has an axial surface and a radial surface, and the several auxiliary sealing parts are a first sealing auxiliary lip and a second sealing auxiliary lip, the first sealing auxiliary lip is in interference contact with the axial surface, and the second sealing auxiliary lip is in interference contact with the radial surface.

[0009] As a further technical solution, there are two first auxiliary sealing lips and two second auxiliary sealing lips.

[0010] As a further technical solution, the main sealing part and the secondary sealing part are both rubber sealing parts.

[0011] As a further technical solution, the outer sealing body has the main sealing part at one end and a rigid bending part at the other end, the rigid bending part has a step groove, and the inner sealing body has one end in interference fit with the main sealing part and the other end arranged at the step groove.

[0012] As a further technical solution, the cross section of the rigid bending portion is trapezoidal.

[0013] As a further technical solution, it also includes:

[0014] Two corrugated rubber layers are respectively arranged on the inner sealing body and the outer sealing body, the corrugated rubber layer of the outer sealing body is used for interference fit with the seat hole of the shell, and the corrugated rubber layer of the inner sealing body is used for interference fit with the rotating shaft.

[0015] As a further technical solution, the corrugated rubber layer of the outer sealing body is located between the main sealing portion and the rigid bending portion, and the corrugated rubber layer of the inner sealing body is located on one end of the inner sealing body close to the main sealing portion.

[0016] As a further technical solution, the inner sealing body is L-shaped, and one end of the inner sealing body close to the main sealing portion has a main sealing lip, and the main sealing portion is in interference contact with the main sealing lip.

[0017] As a further technical solution, it also includes:

[0018] An elastic member is arranged on the main sealing portion and is used for providing a radial clamping force.

[0019] The working principle and beneficial effects of the utility model are:

[0020] In the utility model, the sealing structure changes the traditional anti-mud and water box structure with a dustproof lip to avoid working in a harsh environment. Straw debris and dust can easily enter the sealing structure through the dustproof lip side of the oil seal. Therefore, in the box-type sealing cavity composed of an inner sealing body and an outer sealing body, a plurality of secondary sealing parts are installed to abut against the main sealing part to jointly improve the sealing performance. The main sealing part made of rubber material is generally in interference contact with the inner sealing body, so that the inner sealing body and the outer sealing body form a traditional box-type sealing structure. The additional secondary sealing parts on the main sealing part and further in interference contact with the inner sealing body in the sealing cavity can more effectively prevent the invasion of pollutants such as mud, dust, etc. from the outside. This is because if the sealing structure is to be invaded, in addition to the original invasion of the main sealing part, it is necessary to invade each of the secondary sealing parts in interference contact with the inner sealing body in turn, which greatly improves the difficulty of invasion, slows down or delays the erosion of the main sealing lip and the shaft surface of the inner oil seal, thereby ensuring the sealing performance and improving the service life.

[0021] The flexible design of the multi-dust lip seal structure enables the secondary seal to better adapt to the slight offset or deformation of the moving parts in dynamic applications, such as the sealing of rotating shafts or reciprocating parts, effectively alleviate the wear of the sealing interface, maintain stable sealing performance, and be suitable for a wider range of mechanical equipment.

[0022] Due to the multi-layer sealing structure of this design, it can adapt to more diverse environmental conditions, whether it is high temperature, low temperature, high pressure or an environment containing corrosive substances, it can maintain a good sealing and isolation effect, broadening its scope of application in different industries and application scenarios. It also effectively prevents the entry of pollutants and leakage of media, reduces resource waste and environmental pollution caused by leakage, and reduces the additional energy consumption of equipment due to sealing failure, which meets the needs of modern society for environmental protection and energy efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0024] Figure 1 It is a cross-sectional view of the multi-dust lip sealing structure in the utility model.

[0025] In the figure: 1. inner sealing body, 101. axial surface, 102. radial surface, 103. main sealing lip, 2. outer sealing body, 201. main sealing part, 202. rigid bending part, 203. stepped groove, 3. sealing cavity, 4. auxiliary sealing part, 401. first sealing auxiliary lip, 402. second sealing auxiliary lip, 5. rotating shaft, 6. corrugated rubber layer, 7. shell, 8. elastic member. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0027] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0028] In this article, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] Reference Figure 1 , which is the first embodiment of the utility model, proposes a multi-dust lip sealing structure, including: an inner sealing body and an outer sealing body, the inner sealing body is arranged on the outer sealing body, the outer sealing body has a main sealing part, the main sealing part abuts against the inner sealing body, and a sealing cavity is formed between the main sealing part, the inner sealing body and the outer sealing body, and also includes: a plurality of secondary sealing parts 4, the main sealing part 201 has a plurality of secondary sealing parts 4, the plurality of secondary sealing parts 4 are all located in the sealing cavity 3, and the plurality of secondary sealing parts 4 are all in interference contact with the inner sealing body 1.

[0031] In this embodiment, Figure 1 As shown, the sealing structure changes the traditional anti-mud and water box structure with dustproof lip to avoid working in harsh environment. Straw debris and dust can easily enter the sealing structure through the dustproof lip side of the oil seal. Therefore, in the box-type sealing cavity 3 composed of the inner sealing body 1 and the outer sealing body 2, a plurality of secondary sealing parts 4 are installed to abut against the main sealing part 201 to improve the sealing performance together. The main sealing part 201 made of rubber is generally in interference fit with the inner sealing body 1, so that the inner sealing body 1 and the outer sealing body 2 form a traditional box-type sealing cavity 3. The sealing structure is a kind of sealing structure, and several auxiliary sealing parts 4 are added to the main sealing part 201 and further interfere with the inner sealing body 1 in the sealing cavity 3, which can more effectively prevent the invasion of external pollutants such as mud, dust, etc. This is because if you want to invade the sealing structure, you need to invade the main sealing part 201 and invade each auxiliary sealing part 4 that interferes with the inner sealing body 1 in turn, which greatly improves the difficulty of invasion, slows down or delays the erosion of the main sealing lip and the inner oil seal shaft surface, thereby ensuring the sealing performance and increasing the service life.

[0032] The flexible design of the multi-dust lip sealing structure enables the secondary sealing portion 4 to better adapt to the slight offset or deformation of the moving parts in dynamic applications, such as the sealing of the rotating shaft 5 or reciprocating parts, effectively alleviate the wear of the sealing interface, maintain stable sealing performance, and be suitable for a wider range of mechanical equipment.

[0033] Due to the multi-layer sealing structure of this design, it can adapt to more diverse environmental conditions, whether it is high temperature, low temperature, high pressure or an environment containing corrosive substances, it can maintain a good sealing and isolation effect, broadening its scope of application in different industries and application scenarios. It also effectively prevents the entry of pollutants and leakage of media, reduces resource waste and environmental pollution caused by leakage, and reduces the additional energy consumption of equipment due to sealing failure, which meets the needs of modern society for environmental protection and energy efficiency improvement.

[0034] Furthermore, the inner sealing body 1 is used to abut against the rotating shaft 5, and the inner sealing body 1 has an axial surface 101 and a radial surface 102, and the plurality of auxiliary sealing parts 4 are divided into a first auxiliary sealing lip 401 and a second auxiliary sealing lip 402, the first auxiliary sealing lip 401 is in interference contact with the axial surface 101, and the second auxiliary sealing lip 402 is in interference contact with the radial surface 102.

[0035] In this embodiment, Figure 1 As shown, during use, the inner sealing body 1 is in contact with the rotating shaft 5. In order to enhance the stability and reliability of the seal, it is particularly suitable for the sealing of rotating moving parts, ensuring good sealing performance of the equipment under high-speed rotation or heavy load conditions. Specifically, through the interference contact between the first sealing auxiliary lip 401 and the axial surface 101 and the second sealing auxiliary lip 402 and the radial surface 102, double sealing protection for the rotating shaft 5 in the axial and radial directions is achieved. This design is also conducive to forming a labyrinth protection channel, that is, Figure 1 As shown by the arrow in the figure, if external impurities want to invade the main sealing lip 103 of the main sealing part 201, they must turn and invade in the direction of the arrow. The complex maze-type protection channel can effectively prevent mud, water and impurities from entering the cavity, thereby protecting the oil seal, improving the sealing performance and service life. Under harsh working conditions, it can meet the normal operation of the whole machine, and also eliminate the oil leakage problems caused by installation deformation, scratches, lip flipping, spring shedding, poor mud and water prevention effects of B and FB type oil seals.

[0036] At the same time, filling grease between the main sealing part 201 and the secondary sealing part 4 in the sealing cavity 3 can also avoid dry grinding between the multiple pairs of lips of the outer oil seal and the inner oil seal, thereby ensuring the lubrication and sealing effect.

[0037] Furthermore, there are two first auxiliary sealing lips 401 and two second auxiliary sealing lips 402 .

[0038] In this embodiment, Figure 1As shown, the number of the first auxiliary sealing lip 401 and the number of the second auxiliary sealing lip 402 are respectively set to two, and are arranged at intervals along the axial direction and the radial direction respectively. Such a layout not only provides a more balanced sealing pressure for the rotating shaft 5 and reduces the risk of single-point overload, but also further improves the stability and durability of the overall sealing structure through the increase in quantity, and effectively extends the service life of the sealing structure.

[0039] Furthermore, the main sealing part 201 and the secondary sealing part 4 are both rubber sealing parts.

[0040] In this embodiment, Figure 1 As shown, the number of the first auxiliary sealing lip 401 and the number of the second auxiliary sealing lip 402 are respectively set to two, and are arranged at intervals along the axial direction and the radial direction respectively. Such a layout not only provides a more balanced sealing pressure for the rotating shaft 5 and reduces the risk of single-point overload, but also further improves the stability and durability of the overall sealing structure through the increase in quantity, and effectively extends the service life of the sealing structure.

[0041] Furthermore, the outer sealing body 2 has a main sealing portion 201 at one end and a rigid bending portion 202 at the other end. The rigid bending portion 202 has a stepped groove 203 . One end of the inner sealing body 1 is in interference contact with the main sealing portion 201 , and the other end is arranged at the stepped groove 203 .

[0042] In this embodiment, Figure 1 As shown, the design of the rigid bending part 202 adds a stable supporting structure to the outer sealing body 2, which is convenient for overall installation. The main sealing part 201 made of rubber material is distributed at both ends of the outer sealing body 2, so as to form a box-type sealing cavity 3 structure with the inner sealing body 1. Specifically, one end of the inner sealing body 1 is in interference fit with the main sealing part 201, and the other end is arranged at the stepped groove 203 of the rigid bending part 202. To ensure the sealing performance, the entire inner sealing body 1 also needs to be the same skeleton structure as the rigid bending part 202. This design not only enhances the mechanical stability of the entire sealing structure, especially when dealing with mechanical vibration or external force impact, it can effectively prevent the displacement or deformation of the sealing body, but also provides a convenient installation interface, which is convenient for the precise positioning and installation of the inner sealing body 1, simplifies the assembly process, and improves the installation efficiency.

[0043] Specifically, in order to combine into a box-type sealing structure, one implementation method is that the installation form at the step groove 203 must first be gap assembled and then subjected to a riveting process to meet the use requirements. The specially designed external oil seal bending frame has high strength and rigidity, which ensures the accuracy and stability of the oil seal during installation and use, and the overall installation, maintenance and replacement are convenient. It can be clamped and installed in place at one time, which can reduce installation errors, ensure the installation accuracy and positioning accuracy of the oil seal, and control costs.

[0044] Furthermore, the cross section of the rigid bending portion 202 is trapezoidal.

[0045] In this embodiment, Figure 1 As shown, the rigid bending portion 202 is further limited to a structure with a trapezoidal cross-section, and specifically, a right-angled trapezoid or an isosceles trapezoid may be used. This design cleverly utilizes the geometric characteristics of the trapezoid, so that the inner sealing body 1 is more firmly embedded in the gap in the stepped groove 203, and can better adapt to installation spaces of different diameters or shapes, thereby ensuring a close fit between the contact surfaces of the sealing body and the outer sealing body 2.

[0046] At the same time, the trapezoidal structure can reduce the use of materials and the overall weight while ensuring the sealing performance, which is conducive to the lightweight design of the equipment and reduces energy consumption. In addition, the sealing pressure distribution can be optimized by adjusting the trapezoidal size according to specific application requirements, ensuring the sealing effect while enhancing the adaptability to changes in the external environment.

[0047] Furthermore, it also includes: two corrugated rubber layers 6 are respectively arranged on the inner sealing body 1 and the outer sealing body 2, the corrugated rubber layer 6 of the outer sealing body 2 is used for interference fit with the seat hole of the shell 7, and the corrugated rubber layer 6 of the inner sealing body 1 is used for interference fit with the rotating shaft 5.

[0048] In this embodiment, Figure 1 As shown, during use, the inner sealing body 1 is in interference fit with the rotating shaft 5, and the outer sealing body 2 is in interference fit with the seat hole of the shell 7. The corrugated rubber layer 6 added to the outer sealing body 2, specifically, the corrugation is composed of continuously reciprocating regularly changing broken lines. This shape is used to assemble with the seat hole of the shell 7, which ensures that the assembly of the oil seal will not be damaged or deformed, and ensures the sealing performance, improves the supporting strength, and after being assembled with the inner oil seal, it plays a limiting role on the inner oil seal.

[0049] The corrugated rubber layer 6 added to the inner sealing body 1 is specifically composed of continuously reciprocating regularly changing broken lines. By utilizing this shape to assemble with the rotating shaft 5, it can achieve stable synchronous rotation with the rotating shaft 5, effectively seal and protect the rotating shaft 5, further improve the dynamic adaptability and shock absorbing performance of the sealing structure, and protect the sealing structure from damage by external mechanical shock or vibration.

[0050] Furthermore, the corrugated rubber layer 6 of the outer sealing body 2 is located between the main sealing portion 201 and the rigid bending portion 202 , and the corrugated rubber layer 6 of the inner sealing body 1 is located on one end of the inner sealing body 1 close to the main sealing portion 201 .

[0051] In this embodiment, Figure 1As shown, the positions of the rubber parts and the rigid skeleton parts on the inner and outer sealing bodies are limited, and the entire multi-dust lip sealing structure is further improved. Specifically, the corrugated rubber layer 6 of the outer sealing body 2 is located between the main sealing part 201 and the rigid bending part 202. This layout strategy cleverly utilizes the supporting effect of the rigid bending part 202, enhances the stability of the corrugated rubber layer 6 and the sealing tightness to the seat hole, and the corrugated rubber layer 6 of the inner sealing body 1 is arranged at one end close to the main sealing part 201 to ensure that it is combined with the outer sealing body 2 to form a box-type sealing structure, which is beneficial to the dynamic sealing when the shaft 5 rotates, reduces the direct influence of the axial force on the sealing structure, and maintains good sealing stability.

[0052] Furthermore, the inner sealing body 1 is L-shaped, and one end of the inner sealing body 1 close to the main sealing portion 201 has a main sealing lip 103 , and the main sealing portion 201 is in interference contact with the main sealing lip 103 .

[0053] In this embodiment, Figure 1 As shown, the inner sealing body 1 is specifically limited to be L-shaped, and one end of the inner sealing body 1 close to the main sealing part 201 has a main sealing lip 103. In order to ensure stable interference fit with the main sealing part 201, the inner sealing body 1 and the outer sealing body 2 form a complete box-type sealing structure.

[0054] Furthermore, it also includes: an elastic member 8 is arranged on the main sealing part 201 to provide a radial clamping force.

[0055] In this embodiment, Figure 1 As shown, the elastic member 8 installed on the main sealing part 201 can be specifically in the form of a spring, which can provide long-term and effective radial clamping force compensation and improve the service life and performance of the oil seal.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Multi-dust lip sealing structure, including: An inner sealing body (1) and an outer sealing body (2), wherein the inner sealing body (1) is arranged on the outer sealing body (2), the outer sealing body (2) has a main sealing portion (201), the main sealing portion (201) abuts against the inner sealing body (1), and a sealing cavity (3) is formed between the main sealing portion (201), the inner sealing body (1) and the outer sealing body (2), and is characterized by further comprising: A plurality of secondary sealing parts (4), wherein the primary sealing part (201) has a plurality of secondary sealing parts (4), the plurality of secondary sealing parts (4) are all located in the sealing cavity (3), and the plurality of secondary sealing parts (4) are all in interference contact with the inner sealing body (1).

2. The multi-dust lip sealing structure according to claim 1, characterized in that: The inner sealing body (1) is used for abutting against the rotating shaft (5), and the inner sealing body (1) has an axial surface (101) and a radial surface (102), and the plurality of auxiliary sealing portions (4) are divided into a first auxiliary sealing lip (401) and a second auxiliary sealing lip (402), the first auxiliary sealing lip (401) is in interference contact with the axial surface (101), and the second auxiliary sealing lip (402) is in interference contact with the radial surface (102).

3. The multi-dust lip sealing structure according to claim 2, characterized in that: There are two of each of the first auxiliary sealing lip (401) and the second auxiliary sealing lip (402).

4. The multi-dust lip sealing structure according to claim 1, characterized in that: The main sealing part (201) and the secondary sealing part (4) are both rubber sealing parts.

5. The multi-dust lip sealing structure according to claim 2, characterized in that: The outer sealing body (2) has the main sealing portion (201) at one end and a rigid bending portion (202) at the other end, the rigid bending portion (202) having a stepped groove (203), and the inner sealing body (1) has one end in interference contact with the main sealing portion (201) and the other end arranged at the stepped groove (203).

6. The multi-dust lip sealing structure according to claim 5, characterized in that: The cross section of the rigid bending portion (202) is trapezoidal.

7. The multi-dust lip sealing structure according to claim 5, characterized in that: Also includes: Two corrugated rubber layers (6), the two corrugated rubber layers (6) being respectively arranged on the inner sealing body (1) and the outer sealing body (2), the corrugated rubber layer (6) of the outer sealing body (2) being used for interference fit with the seat hole of the housing (7), and the corrugated rubber layer (6) of the inner sealing body (1) being used for interference fit with the rotating shaft (5).

8. The multi-dust lip sealing structure according to claim 7, characterized in that: The corrugated rubber layer (6) of the outer sealing body (2) is located between the main sealing portion (201) and the rigid bending portion (202), and the corrugated rubber layer (6) of the inner sealing body (1) is located on one end of the inner sealing body (1) close to the main sealing portion (201).

9. The multi-dust lip sealing structure according to claim 5, characterized in that: The inner sealing body (1) is L-shaped, and one end of the inner sealing body (1) close to the main sealing portion (201) is provided with a main sealing lip (103), and the main sealing portion (201) is in interference contact with the main sealing lip (103).

10. The multi-dust lip sealing structure according to claim 1, characterized in that: Also includes: An elastic member (8), the elastic member (8) being arranged on the main sealing portion (201) and being used to provide a radial clamping force.

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