Framework oil seal

Abstract

The utility model relates to a framework oil seal which comprises a rubber sealing body playing a main sealing role, the rubber sealing body comprises an outer check ring on the outermost layer and an inner check ring in direct contact with a shaft part, and a middle check ring is arranged between the outer check ring and the inner check ring; an outer framework is fixedly connected to the outer check ring of the rubber sealing body, a supporting steel ring is fixedly connected between the outer check ring and the middle check ring of the rubber sealing body, and the outer framework is made of carbon steel. Due to the fact that the supporting steel ring is arranged inside the rubber sealing body and the rigid outer framework is arranged outside the rubber sealing body, the novel structure is high in bearing pressure, and the whole framework oil seal cannot deform in the high-temperature and high-pressure working environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the manufacturing technical field of sealing element, especially a skeleton oil seal. BACKGROUND

[0002] The skeleton oil seal is a sealing element of a rotating shaft of a mechanism, which prevents liquid from leaking outward along the rotating shaft and prevents external impurities from entering the mechanism, and has simple structure, easy installation, low cost and wide application.

[0003] The conventional skeleton oil seal is generally composed of rubber material or other high polymer material and a metal skeleton embedded in the interior, and the sealing ring with such structure has a certain interference amount in the free state, i.e., the inner diameter of the skeleton oil seal is smaller than the shaft diameter, which generates a certain radial tight force on the shaft when matched with the shaft part, and the spring can compensate the self-tight force of the oil seal at any time, which basically meets the basic requirements under ordinary working conditions.

[0004] In some high-temperature and high-pressure working environments, such as the hydraulic system, fuel system and other key components of the aerospace and shipbuilding industry, the conventional structure of the skeleton oil seal has a small embedded metal skeleton body, which cannot bear enough force, and the entire oil seal is easily deformed under high-temperature and high-pressure working environments, and the sealing performance is poor, and the service life is reduced, so it needs to be improved to meet the use requirements under different working environments. SUMMARY

[0005] The utility model discloses a skeleton oil seal, which solves the problems in the background art.

[0006] In order to solve the above technical problems, the utility model is realized through the following technical measures: a skeleton oil seal, characterized by comprising a rubber sealing body as a main sealing part, the rubber sealing body comprises an outer retainer ring at the outermost layer and an inner retainer ring in direct contact with the shaft part, and a middle retainer ring is arranged between the outer retainer ring and the inner retainer ring; an outer skeleton is fixedly connected to the outer retainer ring of the rubber sealing body, and a support steel ring is fixedly connected between the outer retainer ring and the middle retainer ring of the rubber sealing body, and the material of the outer skeleton is selected from carbon steel.

[0007] Compared with the prior art, the utility model has the advantages that a support steel ring is arranged in the interior of the rubber sealing body, and a rigid outer skeleton is arranged in the exterior of the rubber sealing body, and the new structure has strong pressure bearing capacity, and the entire skeleton oil seal will not be deformed under high-temperature and high-pressure working environments.

[0008] As a kind of improvement of the utility model, the outside of inner baffle ring is provided with spring groove for fixing self-tightening coil spring.The purpose of selecting this design is that self-tightening coil spring can provide certain restraint force to the inside of inner baffle ring (i.e. oil seal lip), and enhance sealing effect.

[0009] As a kind of improvement of the utility model, the inside of inner baffle ring is provided with arc-shaped ring.The purpose of selecting this design is that it is more suitable for the shaft parts to be sealed, and further enhances sealing effect.

[0010] As a kind of improvement of the utility model, first flange is arranged on middle baffle ring.The purpose of selecting this design is to block one side of supporting steel ring, and prevent the falling of supporting steel ring.

[0011] As a kind of improvement of the utility model, second flange is arranged on outer baffle ring.The purpose of selecting this design is to block the other side of supporting steel ring, and further prevent the falling of supporting steel ring.

[0012] As a kind of improvement of the utility model, the height of inner baffle ring is lower than the height of middle baffle ring.The purpose of selecting this design is that, since inner baffle ring directly contacts with shaft parts, the rubber layer of inner baffle ring is protected, and the impact of foreign matter is reduced.

[0013] As a kind of improvement of the utility model, the shape of outer skeleton is flat U-shaped, and its height is greater than half of the height of outer baffle ring.The purpose of selecting this design is that outer skeleton encloses outer baffle ring of rubber sealing body as much as possible, and the best cost performance is achieved in increasing material cost and increasing rigidity. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0015] In the drawings:

[0016] Figure 1 It is the explosion diagram of skeleton oil seal of the utility model.

[0017] Figure 2 It is the perspective view of skeleton oil seal of the utility model.

[0018] Figure 3 It is the perspective view of rubber sealing body of the utility model.

[0019] Figure 4 It is the sectional view of rubber sealing body of the utility model.

[0020] Figure 5The sectional view of the framework oil seal.

[0021] The figure mark is explained: 1, rubber seal body;2, outer check ring;3, inner check ring;4, middle check ring;5, outer framework;6, support steel ring;7, self-tightening spiral spring;8, spring groove;9, arc-shaped ring;10, first folded edge;11, second folded edge. Specific implementation

[0022] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0023] Example 1

[0024] Please refer to Figure 1 -5.

[0025] The framework oil seal provided in the embodiment comprises a rubber seal body 1 serving as a main sealing part, the rubber seal body 1 comprises an outer check ring 2 as an outermost layer and an inner check ring 3 directly contacting a shaft part, a middle check ring 4 is arranged between the outer check ring 2 and the inner check ring 3, and the outer check ring 2, the middle check ring 4 and the outer check ring 2 are integrally formed with a bottom surface as the rubber seal body 1.

[0026] In the embodiment of the utility model application, please refer to Figure 3 With Figure 4 The outer side of the inner check ring 3 is provided with a spring groove 8 for fixing the self-tightening spiral spring 7. The self-tightening spiral spring 7 can bring a certain binding force to the inner side (i.e. the oil seal lip) of the inner check ring 3, thereby enhancing the sealing effect.

[0027] Further, the inner side of the inner check ring 3 is provided with an arc-shaped ring 9. In the embodiment, three arc-shaped rings 9 are arranged on the inner side (sealing lip) of the inner check ring 3, which can more closely contact the shaft part to be sealed, thereby further enhancing the sealing effect.

[0028] Further, the middle check ring 4 is provided with a first folded edge 10. The first folded edge 10 blocks one side of the support steel ring 6, thereby preventing the support steel ring 6 from falling off. The outer check ring 2 is provided with a second folded edge 11, which blocks the other side of the support steel ring 6, thereby further preventing the support steel ring 6 from falling off.

[0029] Further, the height of the inner check ring 3 is lower than the height of the middle check ring 4. Since the inner check ring 3 directly contacts the shaft part, the rubber layer of the inner check ring 3 needs to be protected from damage, so that the middle check ring 4 or the outer check ring 2 is higher to block the inner check ring 3 from the horizontal direction, thereby reducing the impact of foreign matters.

[0030] In the embodiment of the utility model application, please refer to Figure 5The outer skeleton 5 is fixedly connected to the outer flange 2 of the rubber sealing body 1, and the support steel ring 6 is fixedly connected between the outer flange 2 and the middle flange 4 of the rubber sealing body 1.

[0031] In the embodiment of the present application, the material of the outer skeleton 5 is carbon steel, and the material of the support steel ring 6 is also carbon steel.

[0032] The embodiment provides a skeleton oil seal, which is connected as follows: the support steel ring 6 is arranged between the inner flange 3 and the middle flange 4 of the rubber sealing body 1, and then the rubber sealing body 1 is integrally bonded by using an adhesive; the outer skeleton 5 is bonded on the outer side of the outer flange 2 of the rubber sealing body 1; and the self-tightening coil spring 7 is fixed on the inner flange 3 of the rubber sealing body 1 through the spring groove 8.

[0033] The present application has the advantages that the support steel ring 6 is arranged inside the rubber sealing body 1, and the rigid outer skeleton 5 is arranged outside the rubber sealing body 1, so that the novel structure has high pressure bearing capacity, and the whole skeleton oil seal will not be deformed in a high-temperature and high-pressure working environment.

[0034] In the description of the present application, it should be explained that the terms "vertical", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In the description of the present application, it should be explained that the terms "set", "mounted", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A skeleton oil seal, characterized in that: The system includes a rubber sealing body (1) that serves as the main sealing component. The rubber sealing body (1) includes an outermost outer retaining ring (2) and an inner retaining ring (3) that is in direct contact with the shaft-like parts. A middle retaining ring (4) is provided between the outer retaining ring (2) and the inner retaining ring (3). An outer skeleton (5) is fixedly connected to the outer retaining ring (2) of the rubber sealing body (1). A supporting steel ring (6) is fixedly connected between the outer retaining ring (2) and the middle retaining ring (4) of the rubber sealing body (1). The material of the outer skeleton (5) is carbon steel.

2. The skeleton oil seal according to claim 1, characterized in that: The outer side of the inner retaining ring (3) is provided with a spring groove (8) for fixing the self-tightening helical spring (7).

3. The skeleton oil seal according to claim 1, characterized in that: An arc-shaped ring (9) is provided on the inner side of the inner retaining ring (3).

4. The skeleton oil seal according to claim 1, characterized in that: The middle retaining ring (4) is provided with a first folded edge (10).

5. The skeleton oil seal according to claim 1, characterized in that: The outer retaining ring (2) is provided with a second folded edge (11).

6. The skeleton oil seal according to claim 1, characterized in that: The height of the inner retaining ring (3) is lower than the height of the middle retaining ring (4).

7. The skeleton oil seal according to claim 1, characterized in that: The outer frame (5) is flat and U-shaped, and its height is greater than half the height of the outer retaining ring (2).

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