Sealing element for double-lip shaft

Abstract

The utility model relates to the technical field of sealing, in particular to a sealing element for a double-lip shaft, which comprises a dynamic sealing ring and a metal framework, the metal framework is fixedly sleeved outside the dynamic sealing ring, a static sealing unit is fixedly connected in the metal framework, and the inner wall of the dynamic sealing ring is respectively and fixedly connected with auxiliary lip rubber and a main lip structure; the main lip structure comprises a first main sealing lip and a second main sealing lip which are fixedly installed on the inner wall of the dynamic sealing ring, the second main sealing lip is located on the side, facing the auxiliary lip rubber, of the first main sealing lip, an annular groove is formed in the outer wall of the dynamic sealing ring, and a spring is arranged in the annular groove. The cross section of the inner wall of the annular groove is of an L-shaped structure, and a stop dog used for positioning the spring is installed on the metal framework. A worker can conveniently sleeve the dynamic sealing ring with the spring, and meanwhile the spring is prevented from sliding out of the annular groove.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a seal for a double-lip shaft. Background Technology

[0002] Seals are materials or parts used to prevent fluid or solid particles from leaking between adjacent mating surfaces and to prevent external impurities such as dust and moisture from entering the interior of machinery and equipment. In the prior art, to enhance the sealing effect, an annular groove is made on the sealing ring, and then a spring is placed in the annular groove. The spring is used to apply pressure to the sealing ring so that the sealing ring is in close contact with the shaft. However, the inner wall of the annular groove has a U-shaped cross-section, which makes it inconvenient for workers to put the spring on the outside of the sealing ring, and there are certain limitations. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a double-lip shaft seal to solve the problem that it is inconvenient for workers to put the spring on the outside of the sealing ring.

[0004] To achieve the above objectives, this utility model provides a double-lip shaft seal, comprising a dynamic sealing ring and a metal skeleton. The metal skeleton is fixedly sleeved on the outside of the dynamic sealing ring, and a static sealing unit is fixedly connected inside the metal skeleton. A secondary lip rubber and a main lip structure are fixedly connected to the inner wall of the dynamic sealing ring respectively.

[0005] The main lip structure includes a first main sealing lip and a second main sealing lip, which are respectively fixedly installed on the inner wall of the dynamic sealing ring. The second main sealing lip is located on the side of the first main sealing lip facing the secondary lip rubber. An annular groove is provided on the outer wall of the dynamic sealing ring. A spring is provided in the annular groove. The inner wall of the annular groove has an L-shaped cross-section. A stopper for positioning the spring is installed on the metal frame.

[0006] Preferably, the inner wall of the first main sealing lip is provided with a plurality of reflux grooves, and the reflux grooves are inclined.

[0007] Preferably, the stopper includes several stop plates disposed on the side of the spring away from the rubber of the secondary lip, the spring and the stop plates are in contact, a support bar is fixedly connected to the stop plate, and a plug-in component adapted to the support bar is installed on the metal frame.

[0008] Preferably, the connector includes several positioning sleeves fixedly installed on the inner wall of the metal frame, a groove is provided on the support bar, a prism is slidably provided in the groove, and the end of the prism away from the support bar is located in the corresponding positioning sleeve.

[0009] Preferably, the static sealing unit includes a static main sealing ring and a static secondary sealing ring fixedly installed on the inner wall of the metal frame. Several inclined anti-detachment rubber rings are fixedly connected to the inner wall of the static secondary sealing ring. The metal frame and the spring are made of carbon steel, and the dynamic sealing ring, the static main sealing ring and the static secondary sealing ring are made of rubber.

[0010] The beneficial effects of this utility model are as follows: the operator slides the spring into the annular groove from the side and uses a stopper to position the spring, preventing it from sliding out of the annular groove. When the dynamic sealing ring is fitted on the outside of the shaft, the rubber of the secondary lip prevents external dust or other impurities from entering the machine. The cooperation of the first and second main sealing lips forms a two-stage sealing structure, which improves the sealing performance. Since the inner wall of the annular groove has an L-shaped cross-section, it is convenient for the operator to fit the spring on the outside of the dynamic sealing ring while preventing the spring from sliding out of the annular groove. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is one of the overall structural schematic diagrams of an embodiment of the present utility model;

[0013] Figure 2 This is the second schematic diagram of the overall structure of an embodiment of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the dynamic sealing ring according to an embodiment of the present invention;

[0015] Figure 4 This is a structural schematic diagram of the disassembled stopper according to an embodiment of the present utility model.

[0016] The diagram is marked as follows:

[0017] 1. Dynamic sealing ring; 2. Metal skeleton; 3. Annular groove; 4. Spring; 5. Secondary lip rubber; 6. First main sealing lip; 7. Second main sealing lip; 8. Return groove; 9. Stop plate; 10. Support bar; 11. Slide groove; 12. Prism; 13. Positioning sleeve; 14. Static main sealing ring; 15. Static secondary sealing ring; 16. Anti-detachment rubber ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] This specification provides one or more embodiments of a double-lip shaft seal, such as... Figure 1 , Figure 2 and Figure 3 As shown, it includes a dynamic sealing ring 1 and a metal skeleton 2. The metal skeleton 2 is fixedly sleeved on the outside of the dynamic sealing ring 1. A static sealing unit is fixedly connected inside the metal skeleton 2. The inner wall of the dynamic sealing ring 1 is fixedly connected with a secondary lip rubber 5 and a main lip structure, respectively.

[0021] The main lip structure includes a first main sealing lip 6 and a second main sealing lip 7, which are respectively fixedly installed on the inner wall of the dynamic sealing ring 1. The second main sealing lip 7 is located on the side of the first main sealing lip 6 facing the secondary lip rubber 5. An annular groove 3 is provided on the outer wall of the dynamic sealing ring 1. A spring 4 is provided in the annular groove 3. The inner wall of the annular groove 3 has an L-shaped cross-section. A stopper for positioning the spring 4 is installed on the metal frame 2. The operator slides the spring 4 into the annular groove 3 from the side. The operator positions the spring 4 by the stopper to prevent the spring 4 from sliding out of the annular groove 3. When the dynamic sealing ring 1 is sleeved on the outside of the shaft, the secondary lip rubber 5 prevents external dust or other impurities from entering the machine. The double-layer seal of the first main sealing lip 6 and the second main sealing lip 7 forms a two-stage seal structure to improve the sealing performance. Since the inner wall of the annular groove 3 has an L-shaped cross-section, it is convenient for the operator to sleeve the spring 4 on the outside of the dynamic sealing ring 1 while preventing the spring 4 from sliding out of the annular groove 3.

[0022] In embodiments of this utility model, such as Figure 2 , Figure 3 and Figure 4 As shown, the inner wall of the first main sealing lip 6 is provided with several return grooves 8, and the return grooves 8 are inclined. The stopper includes several stop plates 9 disposed on the side of the spring 4 away from the rubber 5 of the secondary lip. The spring 4 and the stop plates 9 are in contact. A support bar 10 is fixedly connected to the stop plate 9. The metal frame 2 is equipped with a plug fitting adapted to the support bar 10. The plug fitting includes several positioning sleeves 13 fixedly installed on the inner wall of the metal frame 2. The support bar 10 is provided with a sliding groove 11. A prism 12 is slidably disposed in the sliding groove 11, and the end of the prism 12 away from the support bar 10 is located in the corresponding positioning sleeve 13. When the shaft on the machine rotates, it is through The design of the return groove 8 creates a pumping effect at the lip, causing the oil pump flowing to the air side of the oil seal to return to the oil side of the oil seal. When the spring 4 slides into the annular groove 3, the operator drives the end of the prism 12 to insert into the positioning sleeve 13. The operator then drives the stop plate 9 and the support bar 10 to move, so that the stop plate 9 moves to one side of the spring 4, and the end of the prism 12 away from the positioning sleeve 13 is inserted into the slide groove 11. When the dynamic sealing ring 1 and the metal frame 2 are installed on the machine, the end of the support bar 10 away from the positioning sleeve 13 abuts against the side wall of the machine, so that the stop plate 9 is fixed relative to the metal frame 2, thus completing the positioning of the spring 4.

[0023] In embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the static sealing unit includes a static main sealing ring 14 and a static secondary sealing ring 15 fixedly installed on the inner wall of the metal frame 2. Several inclined anti-detachment rubber rings 16 are fixedly connected to the inner wall of the static secondary sealing ring 15. The metal frame 2 and the spring 4 are made of carbon steel, while the dynamic sealing ring 1, the static main sealing ring 14, and the static secondary sealing ring 15 are made of rubber. The static main sealing ring 14 and the static secondary sealing ring 15 seal the connection between the metal frame 2 and the machine equipment. The inclined arrangement of the anti-detachment rubber rings 16 facilitates the fitting of the static main sealing ring 14 and the static secondary sealing ring 15 into the preset installation position. The metal frame 2 increases rigidity, preventing the oil seal from easily deforming, and the spring 4 provides a certain binding force to the dynamic sealing ring 1.

[0024] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0025] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, 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 seal for double lip shaft comprising a dynamic sealing ring (1) and a metal carcass (2), characterized in that, The metal framework (2) is fixedly sleeved outside the dynamic sealing ring (1), the metal framework (2) is fixedly connected with the static sealing unit, the inner wall of the dynamic sealing ring (1) is fixedly connected with the auxiliary lip rubber (5) and the main lip structure respectively; The main lip structure comprises a first main sealing lip (6) and a second main sealing lip (7) which are fixedly installed on the inner wall of the dynamic sealing ring (1), and the second main sealing lip (7) is located on the side of the first main sealing lip (6) facing the auxiliary lip rubber (5), the outer wall of the dynamic sealing ring (1) is provided with an annular groove (3), the annular groove (3) is provided with a spring (4), and the inner wall of the annular groove (3) is in L-shaped structure, and the metal framework (2) is provided with a stopper for positioning the position of the spring (4).

2. The dual lip shaft seal of claim 1 wherein, The inner wall of the first main sealing lip (6) is provided with a plurality of backflow grooves (8), and the backflow grooves (8) are inclined.

3. The dual lip shaft seal of claim 1 wherein, The stopper comprises a plurality of stop plates (9) arranged on the side of the spring (4) away from the auxiliary lip rubber (5), the spring (4) and the stop plate (9) are in contact, the stop plate (9) is fixedly connected with a support strip (10), and the metal framework (2) is provided with a plug-in part matched with the support strip (10).

4. The dual lip shaft seal according to claim 3, wherein, The plug-in part comprises a plurality of positioning sleeves (13) fixedly installed on the inner wall of the metal framework (2), the support strip (10) is provided with a sliding groove (11), the sliding groove (11) is slidably provided with a prism (12), and the end of the prism (12) away from the support strip (10) is located in the corresponding positioning sleeve (13).

5. The dual lip shaft seal in accordance with claim 1 wherein, The static sealing unit comprises a static main sealing ring (14) and a static auxiliary sealing ring (15) fixedly installed on the inner wall of the metal framework (2), and the inner wall of the static auxiliary sealing ring (15) is fixedly connected with a plurality of inclined anti-dropping rubber rings (16).

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