A multi-lip packing seal

Abstract

The utility model relates to the technical field of grease seal, concretely is a kind of multi-lip grease seal.The device includes support framework, sealing rubber fixedly connected on the inner side wall of support framework, first lip, second lip and third lip are fixedly connected on the sealing rubber, the first lip is arranged at the lower end of support framework, the first lip is curved upwards, the second lip is arranged at the middle part of support framework, the third lip is arranged at the upper end of support framework;The upper end of support framework is provided with dust cover for preventing impurities from invading.The device sets up multiple lines of defense, can intercept impurity dust outside, greatly improve the dustproof ability of the device;Moreover, the first lip of the device is smaller, reduces grease injection pressure, prevents grease from leaking from grease injection port.

Description

Technical Field

[0001] This utility model relates to the field of grease sealing technology, specifically a multi-lip grease seal. Background Technology

[0002] Grease seals are lip seals specifically designed for sealing lubricating grease on rotating shafts, and are a type of oil seal. Their core feature is that they contact the rotating shaft through a flexible lip structure and achieve a dynamic seal with the help of spring clamping force. They are mainly used to isolate rotating parts requiring lubrication in mechanical equipment from the external environment.

[0003] However, since the current sealing rubber seals only have a large lip, this structure is difficult to inject grease, requires high injection pressure, and can only be installed in relatively good environments. If used in harsh environments, the existing sealing rubber seals cannot provide significant dust protection. Utility Model Content

[0004] To address the problems of the prior art, this invention provides a multi-lip grease seal that can prevent impurities from entering under harsh environmental conditions.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-lip grease seal, comprising a support frame and a sealing rubber fixedly connected to the inner wall of the support frame, wherein a first lip, a second lip, and a third lip are fixedly connected to the sealing rubber, the first lip is located at the lower end of the support frame and is curved upward, the second lip is located in the middle of the support frame, and the third lip is located at the upper end of the support frame; a dust cover for preventing impurities from entering is provided at the upper end of the support frame.

[0006] With the above structural design, the dust cover can intercept a large number of impurities, and the first lip, second lip and third lip form a defensive line to further prevent dust from entering.

[0007] Preferably, the radial cross-section of the support frame is stepped; the support frame includes a lower frame with an L-shaped radial cross-section and an upper frame fixedly connected to the upper end of the lower frame. The upper frame has an L-shaped radial cross-section, the first lip is located at the lower end of the lower frame, and the second lip is located at the upper end of the lower frame.

[0008] The above structural design facilitates an interference fit between the support frame and the mounting shell.

[0009] Preferably, stepped grooves are formed on the sealing rubber, and the grooves are correspondingly located at the connection between the upper skeleton and the lower skeleton.

[0010] With the above structural design, the groove design can reduce friction and wear. When the oil seal rotates, the groove can guide the formation of fluid dynamic pressure, so that the sealing surface operates in a non-contact state, thereby reducing wear and extending service life.

[0011] Preferably, the dust cover includes an annular inner frame, an annular outer frame, and a top plate fixedly connected to the upper ends of the inner and outer frames. The height of the outer side of the top plate is higher than the height of the inner side of the top plate. The third lip is interference-fitted with the top plate. The upper end of the upper frame extends into the space between the inner and outer frames.

[0012] With the above structural design, the inner frame of the dust cover is interference-fitted with the shaft, the outer frame provides initial dust protection, and the top plate increases its dust protection capability by interference-fitting with the third lip.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This device has multiple lines of defense to intercept impurities and dust, greatly improving its dustproof capability; moreover, the first lip of this device has a small volume, which reduces the grease injection pressure and prevents grease from leaking from the injection port. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the radial cross-section of the support frame of this utility model;

[0017] Figure 3 This is a radial cross-sectional view of the dust cover of this utility model. Detailed Implementation

[0018] Please see Figure 1 , Figure 2 , Figure 3 This utility model provides a technical solution: a multi-lip grease seal, including a support frame 1 and a sealing rubber 2 fixedly connected to the inner wall of the support frame 1. A first lip 21, a second lip 22, and a third lip 23 are fixedly connected to the sealing rubber 2. The first lip 21 is located at the lower end of the support frame 1 and is curved upward. The second lip 22 is located in the middle of the support frame 1 and is curved upward. The third lip 23 is located at the upper end of the support frame 1 and is curved outward, with its opening facing outward. A dust cover 3 for preventing impurities from entering is provided at the upper end of the support frame 1.

[0019] The first lip 21 is used for interference fit with the shaft. The first lip 21 is small, and the interference between the first lip 21 and the shaft is small. Because the first lip 21 is designed with a small interference, the grease injection pressure is small. And because the lip has obvious directionality, it prevents grease from leaking back from the lip.

[0020] The second lip 22 is used to fit with the inclined surface of the shaft. The grease injection pressure is relatively small, and due to the obvious directionality of the lip, grease is prevented from leaking back from the lip.

[0021] The third lip 23 is interference-fitted with the dust cover 3. The interference fit is designed to prevent excessive grease leakage from the outside of the oil seal due to excessive grease injection pressure or excessive grease injection time.

[0022] The radial cross-section of the support frame 1 is stepped; the support frame 1 includes a lower frame 11 with an L-shaped radial cross-section and an upper frame 12 fixedly connected to the upper end of the lower frame 11. The radial cross-section of the upper frame 12 is L-shaped. The first lip 21 is located at the lower end of the lower frame 11, and the second lip 22 is located at the upper end of the lower frame 11.

[0023] The sealing rubber 2 has stepped grooves 24, which are correspondingly located at the connection between the upper skeleton 12 and the lower skeleton 11.

[0024] The dust cover 3 is an inverted annular groove structure. The dust cover 3 includes an annular inner frame 31, an annular outer frame 32, and a top plate 33 fixedly connected to the upper ends of the inner frame 31 and the outer frame 32. The height of the outer side of the top plate 33 is higher than the height of the inner side of the top plate 33. The top plate 33 is a conical inclined surface. The third lip 23 is interference-fitted with the top plate 33. The upper end of the upper frame 12 extends into the space between the inner frame 31 and the outer frame 32.

[0025] The dust cover 3 is made of irregular stamping. The inner frame 31 is interference-fitted with the shaft, the outer frame 32 provides initial dust protection, and the top plate 33 is interference-fitted with the third lip to increase its dust protection capability.

[0026] The dust cover 3 and the shaft are interference-fitted, and the support frame 1 and the mounting shell are interference-fitted, making assembly more convenient and quick, and reducing the risk caused by poor assembly.

[0027] Working principle: The operator first fits the dust cover 3 with the shaft and the support frame 1 with the mounting shell. Then the operator installs the shaft into the support frame 1. The first lip 21 fits the shaft with the shaft, the second lip 22 fits the inclined surface of the shaft with ...

[0028] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the scope of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model's implementation.

[0029] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A multi-lip grease seal, comprising a support frame (1) and a sealing rubber (2) fixedly connected to the inner wall of the support frame (1), characterized in that: The sealing rubber (2) is fixedly connected to a first lip (21), a second lip (22) and a third lip (23). The first lip (21) is located at the lower end of the support frame (1) and is curved upward. The second lip (22) is located in the middle of the support frame (1). The third lip (23) is located at the upper end of the support frame (1). A dust cover (3) is provided at the upper end of the support frame (1) to prevent impurities from entering.

2. The multi-lip sealing grease sealant according to claim 1, characterized in that: The radial cross section of the support frame (1) is stepped; the support frame (1) includes a lower frame (11) with an L-shaped radial cross section and an upper frame (12) fixedly connected to the upper end of the lower frame (11). The upper frame (12) has an L-shaped radial cross section, the first lip (21) is located at the lower end of the lower frame (11), and the second lip (22) is located at the upper end of the lower frame (11).

3. The multi-lip sealing grease sealant according to claim 2, characterized in that: The sealing rubber (2) has stepped grooves (24) which are respectively located at the connection between the upper skeleton (12) and the lower skeleton (11).

4. The multi-lip sealing grease sealant according to claim 2, characterized in that: The dust cover (3) includes an annular inner frame (31), an annular outer frame (32), and a top plate (33) fixedly connected to the upper end of the inner frame (31) and the outer frame (32). The height of the outer side of the top plate (33) is higher than the height of the inner side of the top plate (33). The third lip (23) is interference-fitted with the top plate (33). The upper end of the upper frame (12) extends into the space between the inner frame (31) and the outer frame (32).

Images