Sealing arrangement and bearings

Abstract

A sealing arrangement is disclosed for sealing between a first component (200) and a second component (300), which are rotatable relative to each other. The sealing arrangement (100) comprises a frame (10) and a sealing body (20), the sealing body (20) being attached to an outer wall of the frame (10). The sealing body (20) is provided with sealing lips (21), the sealing lips (21) being dynamically in contact with the second component (300). The sealing lips (21) comprise a main lip (211) and dust lips (212), the main lip (211) and the dust lips (212) being axially spaced apart, and a first annular cavity (213) being formed between the main lip (211), the dust lips, and the second component (300).The dust lips (212) comprise at least a first dust lip (2121) and a second dust lip (2122), wherein the second dust lip (2122) is used for dynamic contact with the second component (300) and the second dust lip (2122) is provided with a vent hole (2123) that extends through the second dust lip (2122). The vent hole (2123) communicates with the first annular cavity (213), and the first dust lip (2121) is located on the side of the second dust lip (2122) away from the first annular cavity (213) and is used to cover the vent hole (2123) in the axial and radial directions.The problem of vacuum formation in the first annular cavity is solved by the ventilation hole, and by using the first dust lip to cover the ventilation hole, the problems of leakage and failure due to accelerated wear of the sealing lips 21, caused by the direct ingress of contaminating particles into the first annular cavity through the ventilation hole, are solved. A bearing utilizing the described sealing arrangement is also disclosed.

Description

Technical field

[0001] The present invention relates to the technical field of sealing industrial and automotive systems and in particular to a sealing arrangement and a bearing suitable for working environments with contaminating particles. background

[0002] A sealing arrangement typically comprises a frame and a rubber attached to an outside of the frame, wherein the rubber is provided with sealing lips at the points where the rubber dynamically bears against a shaft or bore, wherein the sealing lips comprise dust lips and a main lip along an axial direction, wherein the dust lips and the main lip are spaced apart in the axial direction, a closed space is formed between the dust lips and the main lip, and the dust lips can effectively prevent contaminating particles from entering the closed space and other chambers, thus contributing to the sealing.

[0003] However, if the sealing assembly rotates or the operating temperature changes, the air can expand and, with increasing temperature, be forced out of the enclosed space, while with decreasing temperature, the air cannot enter the enclosed space. This creates a vacuum phenomenon in the enclosed space between the dust lips and the main lip, which presses the dust lips and the main lip firmly against the shaft. This accelerates wear of the sealing lips, which can lead to leaks and ultimately to failure of the sealing assembly. Brief description

[0004] To overcome the problems existing in the prior art, the present invention provides a sealing arrangement and a bearing.

[0005] According to a first aspect of an embodiment of the present invention, the present invention provides a sealing arrangement used for sealing between a first component and a second component that are rotatable relative to each other. The sealing arrangement comprises: a frame and a sealing body, wherein the sealing body is attached to an outer wall of the frame, the sealing body is provided with sealing lips, the sealing lips dynamically bearing against the second component, the sealing lips comprising a main lip and dust lips, the main lip and the dust lips being axially spaced apart, and a first annular cavity being formed between the main lip, the dust lips, and the second component, wherein the dust lips comprising at least a first dust lip and a second dust lip, the second dust lip being used for dynamic bearing against the second component.The second dust lip is provided with a ventilation hole that passes through the second dust lip, the ventilation hole is connected to the first annular cavity, and the first dust lip is located on one side of the second dust lip away from the first annular cavity and is used to cover the ventilation hole in the axial and radial directions.

[0006] In some embodiments, the first dust lips and the second dust lips extend from one axial side to the other axial side and extend obliquely from a radial outside to a radial inside, the radial inner walls of the first dust lips being provided with a helical groove.

[0007] In some embodiments, where the second dust lips do not dynamically abut the second component, the first dust lips and the second dust lips are spaced apart to form a second annular cavity, the second annular cavity being connected to an external environment, and the ventilation holes connecting the first annular cavity and the second annular cavity.

[0008] In some embodiments, when the second dust lips dynamically rest against the second component, the free ends of the radial inner surfaces of the second dust lips are deformed in a radial direction and at least partially conform to the free ends of the radial inner surfaces of the first dust lips.

[0009] In some embodiments, the free ends of the radial inner surfaces of the first dust lips and the free ends of the radial inner surfaces of the second dust lips together form an annular opening of the second annular cavity, and the ventilation holes are located on the radial outer surfaces of the second dust lips away from the annular opening.

[0010] In some embodiments, the direction of extension of the ventilation holes runs perpendicular to the radial outer walls of the second dust lips.

[0011] In some embodiments, a plurality of ventilation holes are arranged at equal intervals along a circumferential direction of the second dust lips.

[0012] In some embodiments, the first dust lips have a continuous and uninterrupted ring-shaped structure in the circumferential direction.

[0013] In some embodiments, a plurality of the first dust lips are arranged circumferentially and correspond to the ventilation holes in terms of position and number.

[0014] In some embodiments, the first dust lips and the second dust lips are demolded and formed in one piece.

[0015] In some embodiments, the first dust lips are arranged separately from the second dust lips and are fixed away from the first annular cavity by gluing them to one side of the second dust lips.

[0016] In some embodiments, the main lip is located on one axial side of the frame; and the dust lips are located on the other axial side of the frame.

[0017] According to a second aspect of an embodiment of the present invention, the present invention provides a bearing comprising the sealing arrangement described in the first aspect.

[0018] The technical solutions provided by the embodiments of the present invention can include the following advantages: The dust lips comprise a first dust lip and a second dust lip, the second dust lip having the vent hole that communicates with the first annular cavity, and the first dust lip covering the vent hole in the axial and radial directions. The first annular cavity can exchange gas with the external environment via the vent hole, thereby solving the problem of the first annular cavity being subjected to vacuum formation between the dust lips and the main lip. The first dust lip covers the vent hole in the axial and radial directions.When used in an environment with contaminating particles, the first dust lip can prevent the external contaminating particles from entering the first annular cavity directly through the vent hole, thus solving the problems of accelerated wear of the sealing lips and therefore leaks and failures caused by the contaminating particles. Brief description of the drawings

[0019] The drawings included in the description and forming part of it illustrate embodiments in accordance with the present invention and serve to explain the principles of the present invention in connection with the description. Fig. Figure 1 shows a sectional view of a sealing arrangement according to an embodiment of the present invention; Fig. 2 is a partially enlarged view of dust lips from Fig. 1, which shows a schematic representation of a state in which a first dust lip and a second dust lip are spaced apart when the sealing arrangement is not mounted between a first component and a second component; Fig. 3 is a partially enlarged view of dust lips from Fig. 1, which shows a schematic representation of a state in which the first dust lip and the second dust lip are at least partially in contact and fit together when the sealing arrangement is mounted between the first component and the second component. Detailed description

[0020] Exemplary embodiments are described in detail herein; examples are illustrated in the drawings. Unless otherwise specified, when reference is made to the drawings in the following description, the same reference numerals refer to the same or similar elements in different drawings. The embodiments described in the following examples do not represent all embodiments within the meaning of the present invention. Rather, they are merely examples of devices and methods that correspond to some aspects of the present invention as described in detail in the appended claims.

[0021] In the present invention, unless otherwise specified, an axial direction A, a radial direction R and a circumferential direction refer to an axial direction A, a radial direction R and a circumferential direction of a sealing arrangement 100 respectively; an axial side or an axial end refers to a right end in Fig. 1, Fig. 2 and Fig. 3, and the other axial end or side refers to a left end in Fig. 1, Fig. 2 and Fig. 3; and a radial outside refers to a top side in Fig. 1, and a radial inside refers to a bottom side in Fig. 3.

[0022] In related technologies, a sealing arrangement 100 is provided which is able to solve a vacuum problem between the dust lips 212 and a main lip 211; that is, ventilation holes 2123 are arranged on the dust lips 212. However, if the sealing arrangement 100 is used in an environment with contaminating particles, the contaminating particles readily penetrate the enclosed space of the sealing lips through the ventilation holes 2123, which also accelerates the wear of the sealing lips and leads to leaks and failures. To eliminate the vacuum problem of the sealing arrangement 100 in the environment with contaminating particles and at the same time solve the technical problem of the penetration of contaminating particles into the enclosed space of the sealing lips through the ventilation holes 2123, the present invention provides a sealing arrangement 100. As shown in Fig. As shown in Figure 1, the sealing arrangement 100 of the present invention is generally ring-shaped and can be used for sealing between a first component 200 and a second component 300, which are rotatable relative to each other, wherein the first component 200 and the second component 300, which are rotatable relative to each other, can be an outer ring and an inner ring of a bearing, but can also be a bore and a shaft, which are rotatable relative to each other, without any specific limitation in this respect.

[0023] In this embodiment, an example is used for illustration in which the first component 200 serves as a bore and the second component 300 as a shaft, the second component 300 being located as a shaft within the first component 200 being a bore. The second component 300 is relatively stationary, and the first component 200 may rotate relative to the second component 300; or the first component 200 is relatively stationary, and the second component 300 rotates relative to the first component 200, without any specific limitation. As in Fig. As shown in Figure 1, the sealing assembly 100 comprises a frame 10 and a sealing body 20, the sealing body 20 being attached to an outer wall of the frame 10. The frame 10 is typically made of a metal material and serves to support and fix the sealing body 20, as well as to reinforce the overall seal of the sealing assembly 100. The sealing body 20 typically comprises a rubber material, the rubber material being wear-resistant, waterproof, and capable of elastic deformation. The sealing body 20 is attached and fixed to the outer wall of the frame 10 by a vulcanization process. When the sealing assembly 100 abuts the first component 200 and the second component 300, a sealing function of the sealing assembly 100 is achieved by the press fit between the sealing body 20 and the first component 200 and the second component 300.

[0024] In this embodiment, the sealing arrangement 100 can be used in a bearing. Therefore, the first component 200 and the second component 300, which are rotatable relative to each other, can be an outer ring and an inner ring of the bearing, respectively. The sealing arrangement 100 can be positioned at both axial ends of the bearing to form a relatively tight, closed space between the inner and outer rings. The sealing arrangement can prevent external contaminants from entering the closed space and contaminating a medium within it, or prevent the medium from escaping from the closed space into the external environment.

[0025] In this embodiment, the frame 10 can have the shape of an inverted L and comprise a transverse section 11 and a radial section 12. The radial outer surface of the transverse section 11 is enclosed by the sealing body 20 and is interference-fitted with an inner wall of the first component 200 (e.g., the outer ring) to establish a torsional connection between the sealing assembly 100 and the first component 200. The radial section 12 is connected to the other axial end of the transverse section 11. The sealing body 20 is provided with sealing lips 21. The sealing lips 21 are located on the radial inner surface of the radial section 12 and extend out of the radial section 12 of the frame 10. The sealing lips 21 of the sealing body 20 are used for dynamic contact with the second component 300.

[0026] It should be noted that the shape of the frame 10 shown in this embodiment and the accompanying drawings is merely exemplary and is not intended to limit the scope of protection of this disclosure. In other embodiments, the frame 10 can be designed in any shape depending on the design requirements, and the possibilities contained herein are not limited to a single one.

[0027] Furthermore, the sealing lips 21 comprise a main lip 211 and dust lips 212, wherein the main lip 211 and the dust lips 212 are spaced axially apart, and the main lip 211 can be located on one axial side of the frame 10 (i.e., the radial section 12). The dust lips 212 can be located on the other axial side of the frame 10 (i.e., the radial section 12). A first annular cavity 213 is formed between the main lip 211, the dust lips 212, and the second component 300. The main lip 211 serves to prevent the medium enclosed in the bearing from escaping into the first annular cavity 213 and from there into the external environment, while the dust lips 212 serve to prevent external contaminants from entering the first annular cavity 213 and from there into the sealed medium.

[0028] In some other embodiments, depending on the structure of the frame 10, the main lip 211 and the dust lips 212 can both be located on one axial side of the frame 10, or the main lip 211 and the dust lips 212 can both be located on the other axial side of the frame 10.

[0029] Furthermore, the dust lips 212 can comprise at least a first dust lip 2121 and a second dust lip 2122. The second dust lip 2122 is used for dynamic contact with the second component 300 and is provided with a ventilation hole 2123 that extends through the second dust lip 2122. The ventilation hole 2123 communicates with the first annular cavity 213 and with the external environment, thus allowing the first annular cavity 213 to communicate with the external environment. The first dust lip 2121 is located on the radial outer surface of the second dust lip 2122. The first dust lip 2121 does not contact the second component 300 and is used to cover the ventilation hole 2123 in both the axial and radial directions.

[0030] The first dust lip 2121 covers the ventilation hole 2123, which means that the first dust lip 2121 can cover an opening of the ventilation hole 2123 with or without contact, making it more difficult for external contaminating particles to enter the ventilation hole 2123.

[0031] As can be seen, the first annular cavity 213 can exchange gas with the external environment via the vent hole 2123, thus resolving the problem of a vacuum forming in the first annular cavity 213 between the dust lips 212 and the main lip 211. The first dust lip 2121 covers the vent hole 2123 in the axial direction A and / or radial direction R and, when used in an environment with contaminating particles, prevents the external contaminating particles from readily entering the first annular cavity 213 directly through the vent hole 2123. This solves the problems of accelerated wear of the sealing lips 21 and, consequently, the leaks and failures caused by the contaminating particles.

[0032] The first dust lip 2121 and the second dust lip 2122 extend from one axial side to the other axial side and extend obliquely from a radial outer side to a radial inner side. As shown from Fig. As can be seen in Figure 1, in this embodiment the first dust lip 2121 and the second dust lip 2122 extend obliquely and almost parallel along the second component 300. In some embodiments, when the sealing arrangement 100 is not mounted between the shaft and the bore (i.e., between the first component 200 and the second component 300), the first dust lip 2121 and the second dust lip 2122 may only partially fit together. After mounting the sealing arrangement 100 between the shaft and the bore, the fit between the first dust lip 2121 and the second dust lip 2122 becomes tighter, thus preventing external contaminating particles from entering the first annular cavity 213.

[0033] In this embodiment, the first dust lip 2121 can be arranged separately from the second dust lip 2122; that is, the first dust lip 2121 and the second dust lip 2122 are not demolded and formed in one piece. After completion of the machining, the first dust lip 2121 can be fixed on one side of the second dust lip 2122, away from the inner ring, by gluing, a fastener, or in another way, in order to cover the ventilation hole 2123 in the axial direction A or the radial direction R.

[0034] In this embodiment, as in Fig. As shown in Figure 2, however, a radial gap exists between the first dust lip 2121 and the second dust lip 2122 when the sealing arrangement 100 is not mounted between the inner and outer rings of the bearing. The first dust lip 2121 and the second dust lip 2122 are separated from each other by the elastic action of the rubber, so that the first dust lip 2121 and the second dust lip 2122 are spaced apart to form a second annular cavity 2125. The second annular cavity 2125 can be connected to the external environment, and the vent hole 2123 connects the first annular cavity 2123 to the second annular cavity 2125.The second annular cavity 2125 extends a path between the external environment and the first annular cavity 213 and can also prevent the external contaminating particles from entering directly into the ventilation hole 2123 or the first annular cavity 213, thus contributing to buffering.

[0035] In this embodiment, the first dust lip 2121 can also be arranged separately from the second dust lip 2122 or be formed integrally with the second dust lip 2122, without any specific limitation in this respect. Furthermore, the first dust lip 2121 is designed as a continuous and complete annular structure in the circumferential direction; a plurality of independent first dust lips 2121 can also be arranged in the circumferential direction; and the number and position of the first dust lips 2121 correspond to those of the ventilation holes 2123, such that the ventilation holes 2123 are covered in the axial and radial directions.

[0036] As in Fig. As shown in Figure 3, after the sealing arrangement 100 is mounted between the shaft and the bore, i.e., when the second dust lip 2122 dynamically abuts the second component 300, a free end of a radial inner surface of the second dust lip 2122 is compressed and deformed in a radial direction, so that a free end of a radial inner surface of the second dust lip 2122 at least partially abuts the first dust lip 2121 to fit together.

[0037] As can be seen, the second annular cavity 2125, formed by the spacing of the first dust lip 2121 and the second dust lip 2122, can be designed such that the first dust lip 2121 and the second dust lip 2122 can be separated from each other by the spacing and the elastic action of the rubber when the sealing arrangement 100 is not mounted between the first component 200 and the second component 300, thus avoiding rubber adhesion caused by a permanent fit between the first dust lip 2121 and the second dust lip 2122, which prevents external gas from entering the first annular cavity 213 and causes the problem of vacuum formation in the first annular cavity 213.

[0038] The size of the gap between the first dust lip 2121 and the second dust lip 2122 can be such that, after the sealing arrangement 100 is mounted between the first component 200 and the second component 300, the second dust lip 2122 can be compressed and deformed radially to at least partially abut or conform to the first dust lip 2121, thereby reducing the size of the subsequent annular opening of the second annular cavity 2125. However, the reduction of the annular opening of the second annular cavity 2125 does not impede the free flow of external gas into and out of the first annular cavity 213, so the sealing lips 21 can prevent the problem of vacuum formation in the first annular cavity 213 and simultaneously greatly reduce the possibility of external contaminating particles entering the first annular cavity 213.

[0039] Modifications to the first dust lip 2121 and the second dust lip 2122 before and after the assembly of the first component 200 and the second component 300 therefore not only prevent the first dust lip 2121 and the second dust lip 2122 from sticking, thus extending their service life when the sealing assembly 100 is not assembled, but can also prevent contaminating particles from entering the first annular cavity 213 without causing the problem of vacuum formation in an environment with the contaminating particles during the assembly of the sealing assembly 100, thereby significantly improving the resistance of the sealing assembly 100 to contaminating particles and considerably extending the service life of the sealing assembly 100.Furthermore, in both of the preceding embodiments, regardless of whether the first dust lip 2121 and the second dust lip 2122 partially mate before or after assembly into the shaft and bore, the inner wall of the first dust lip 2121 is provided with a helical groove 2124. If the first dust lip 2121 and the second dust lip 2122 only partially mate, the helical groove 2124 can prevent the first dust lip 2121 and the second dust lip 2122 from fully mateing, with the helical groove 2124 and the vent hole 2123 forming a labyrinth seal, and the helical groove 2124 allowing the vent hole 2123 to communicate with the external environment.Therefore, the external gas can freely flow in and out of the first annular cavity 213 through the spiral groove 2124 and the vent hole 2123, thus avoiding the problem of a vacuum forming in the first annular cavity 213 between the dust lips 212 and the main lip 211. Furthermore, the labyrinth seal formed by the spiral groove 2124 and the vent hole 2123 extends a path for contaminating particles into the first annular cavity 213, effectively preventing their entry. In addition, the spiral groove 2124 can also collect and trap minute penetrating contaminating particles and, when the sealing assembly 100 rotates, force these collected and trapped contaminating particles out of the spiral groove 2124 by means of centrifugal force and a pumping effect.

[0040] In some embodiments, such as in Fig. 1, Fig. 2 to Fig. As shown in Figure 3, the free end of the radial inner surface of the first dust lip 2121 and the free end of the radial inner surface of the second dust lip 2122 together form the annular opening of the second annular cavity 2125, wherein the ventilation hole 2123 is located on a radial outer surface of the second dust lip 2122 away from the annular opening.

[0041] The annular opening of the second annular cavity 2125 is located at the free ends of the radial inner surfaces of the first dust lip 2121 and the second dust lip 2122, and the vent hole 2123 is located on the radial outer surface, such that a channel extends from the radial inner surface to the radial outer surface and is located there. The channel does not impede the free flow of external gas into and out of the first annular cavity 213, but rather lengthens a path of movement for the contaminating particles and thus prevents the contaminating particles from readily entering the first annular cavity 213.Furthermore, if the second component 300 is relatively stationary and the first component 200 rotates relative to the second component 300, the direction in which the contaminating particles enter the second annular cavity 2125 is opposite to the direction of the centrifugal force, thus preventing the entry of the contaminating particles. In some embodiments, the direction of extension of the ventilation hole 2123 is perpendicular to an outer wall of the second dust lip 2122 in the radial direction R. The opening of the ventilation hole 2123 is perpendicular to the outer wall of the second dust lip 2122. In this way, the opening area of ​​the ventilation hole 2123 on the second dust lip 2122 can be minimized, thereby reducing the probability of external contaminating particles entering the first annular cavity 213.

[0042] In this embodiment, a plurality of ventilation holes 2123 are arranged at equal intervals along the circumference of the second dust lip 2122. In some other embodiments, the second dust lip 2122 can also be provided with a plurality of ventilation holes 2123 at unequal intervals along its circumference. A plurality of ventilation holes 2123 can play a role in redundancy or redundancy, thereby reducing the likelihood of the first annular cavity 213 being subject to vacuum formation. Conversely, if a plurality of ventilation holes 2123 are arranged at equal intervals along the circumference of the second dust lip 2122, the problem of local vacuum formation, which leads to local wear of the second dust lip 2122, can be prevented.

[0043] In some embodiments, the sealing arrangement 100 is further provided with a spring 30, and the spring 30 is used to clamp it against a radial outer surface of the main lip 211. When the sealing arrangement 100 is mounted between the first component 200 and the second component 300, the spring 30 ensures that the main lip 211 of the sealing lips 21 always rests against the second component 300, thereby preventing the contaminating particles entering the first annular cavity 213 from passing through the main lip 211 into a chamber on an axial side of the main lip 211. Furthermore, the spring 30 can also fix the position of the main lip 211 and thus prevent movement of the main lip 211 in the axial direction A when the second component 300 rotates at high speed, which accelerates the wear of the main lip 211 and reduces the sealing performance of the sealing arrangement 100.

[0044] It is understood that the terms "first," "second," and the like are used to describe different constructions, but these constructions are not limited to these terms. These terms serve solely to distinguish constructions of the same type from one another and do not indicate any particular order or ranking. In fact, the terms "first," "second," and the like are completely interchangeable. For example, without deviating from the scope of protection of the present invention, the first dust lip 2121 can also be referred to as the second dust lip 2122, and analogously, the second dust lip 2122 can also be referred to as the first dust lip 2121.

[0045] After considering the description and practical implementation of the invention disclosed herein, a person skilled in the art will readily recognize other implementations of the present invention. This application is intended to cover all modifications, uses, or adaptations of the present invention, wherein such modifications, uses, or adaptations comply with the general principles of the present invention and include common knowledge or standard technical means in this field that are not disclosed in the present invention. The description and embodiments are to be considered merely as examples, the true scope of protection and the basic concept of the present invention being specified by the following claims.

[0046] It is understood that the present invention is not limited to the precise construction described above and illustrated in the accompanying drawings, and that various modifications and variations may be made without altering its scope of protection. The scope of protection of the present invention is limited exclusively by the accompanying claims.

Claims

[1] Sealing arrangement (100) used for sealing between a first component (200) and a second component (300) which are rotatable relative to each other, the sealing arrangement (100) comprising: a frame (10); and a sealing body (20), wherein the sealing body (20) is attached to an outer wall of the frame (10), the sealing body (20) is provided with sealing lips (21), the sealing lips (21) dynamically bear against the second component (300), the sealing lips (21) comprise a main lip (211) and dust lips (212), the main lip (211) and the dust lips (212) are spaced apart in the axial direction, and a first annular cavity 213 is formed between the main lip, the dust lips, and the second component (300). wherein the dust lips (212) comprise at least first dust lips (2121) and second dust lips (2122), the second dust lips (2122) being used for dynamic contact with the second component (300), the second dust lips (2122) being provided with ventilation holes (2123) passing through the second dust lips (2122), the ventilation holes (2123) being connected to the first annular cavity (213), and the first dust lips (2121) being located on one side of the second dust lips (2122) away from the first annular cavity (213) and being used to cover the ventilation holes (2123) in the axial and radial directions. [2] Sealing arrangement (100) according to claim 1, wherein the first dust lips (2121) and the second dust lips (2122) extend from one axial side to the other axial side and extend obliquely from a radial outside to a radial inside, wherein the radial inner walls of the first dust lips (2121) are provided with a helical groove (2124). [3] Sealing arrangement (100) according to claim 1, wherein when the second dust lips (2122) do not dynamically abut the second component (300), the first dust lips (2121) and the second dust lips (2122) are spaced apart to form a second annular cavity (2125), wherein the second annular cavity (2125) is connected to an external environment, and the ventilation holes (2123) connect the first annular cavity (213) and the second annular cavity (2125). [4] Sealing arrangement (100) according to claim 3, wherein when the second dust lips (2122) dynamically bear against the second component (300), the free ends of the radial inner surfaces of the second dust lips (2122) are deformed in a radial direction and at least partially adapt to the free ends of the radial inner surfaces of the first dust lips (2121). [5] Sealing arrangement (100) according to claim 3, wherein the free ends of the radial inner surfaces of the first dust lips (2121) and the free ends of the radial inner surfaces of the second dust lips (2122) together form an annular opening of the second annular cavity (2125), and the ventilation holes (2123) are located on the radial outer surfaces of the second dust lips (2122) away from the annular opening. [6] Sealing arrangement (100) according to claim 1, wherein the direction of extension of the ventilation holes (2123) is perpendicular to the radial outer walls of the second dust lips (2122). [7] Sealing arrangement (100) according to claim 1, wherein a plurality of ventilation holes (2123) are arranged at equal intervals along a circumferential direction of the second dust lips (2122). [8] Sealing arrangement (100) according to claim 7, wherein the first dust lips (2121) have a continuous and uninterrupted ring-shaped structure in the circumferential direction. [9] Sealing arrangement (100) according to claim 7, wherein a plurality of the first dust lips (2121) are arranged circumferentially and correspond to the ventilation holes (2123) in terms of position and number. [10] Sealing arrangement (100) according to one of claims 1-9, wherein the first dust lips (2121) and the second dust lips (2122) are molded and formed in one piece. [11] Sealing arrangement (100) according to one of claims 1-9, wherein the first dust lips (2121) are arranged separately from the second dust lips (2122) and are fixed away from the first annular cavity (213) by gluing to one side of the second dust lips (2122). [12] Sealing arrangement (100) according to claim 1, wherein the main lip (211) is located on an axial side of the frame (10); and the dust lips (212) are located on the other axial side of the frame (10). [13] Bearing comprising the sealing arrangement (100) according to any one of claims 1-10.

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