Flexible support gap adjustable sealing structure

Abstract

The utility model discloses a flexible support gap adjustable sealing structure which at least comprises but not limited to a sealing cover and sealing teeth matched with a rotating part, the sealing teeth are arranged on the end face, close to the rotating part, of the sealing cover in an embedded mode through a connecting cavity, and an elastic element is arranged between the connecting cavity and the sealing teeth. A pull rod is arranged between the sealing cover and the sealing teeth, and a sealing gap is formed between the sealing teeth and the rotating component. According to the scheme, the sealing teeth are supported by the elastic elements and can adapt to the swing degree of the shaft under the small-gap sealing condition, hard friction between the shaft and the sealing teeth is avoided, and the problems of abrasion and heating are solved; meanwhile, the requirement for the initial installation gap precision of the sealing device can be lowered through the self-adaptive adjusting capacity of the elastic element in the scheme, and the installation period is shortened; and meanwhile, frequent gap adjustment in the operation process is avoided, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings for power generation equipment, in particular to a flexible support gap adjustable sealing structure. Background Art

[0002] The oil tank sealing structure of power generation equipment mainly includes labyrinth seal, contact seal, gas seal and the combination of these seals. For non-contact seals such as labyrinth seal and gas seal, the sealing teeth are directly fixed on the sealing cover, and the sealing gap between the sealing teeth and the rotating parts is not easy to adjust, which is not conducive to maintaining long-term sealing.

[0003] The patent with application number CN202023048664.5 in the prior art proposes an adjustable oil tank sealing device, including a sealing cover and sealing teeth adapted to a rotating component, a sealing gap is formed between the sealing teeth and the rotating component, and the sealing teeth and the sealing cover are gap-matched, characterized in that: an adjusting part is provided on the sealing cover, a screw rod is connected through the adjusting part, a nut is sleeved on the screw rod, a notch is opened at the end of the screw rod, and the sealing teeth and the adjusting part are fastened to each other by a screw rod.

[0004] This patent can adjust the sealing gap between the sealing teeth and the rotating parts when installing the oil tank cover according to actual needs, which is conducive to maintaining long-term sealing and improving sealing reliability and sealing effect. However, the radial support of the sealing teeth in this patent is a rigid support. If the gap is too small during installation and the shaft swing is large, it is easy to cause friction between the shaft and the sealing teeth, resulting in accelerated wear of the sealing teeth. Utility Model Content

[0005] The purpose of the utility model is to provide a flexible support gap adjustable sealing structure to address the above-mentioned deficiencies, thereby solving the problem that the radial support of the sealing teeth in the prior art is a rigid support, and if the gap is too small during installation and the shaft swing is large, it is easy to cause friction between the shaft and the sealing teeth, resulting in accelerated wear of the sealing teeth.

[0006] The utility model is realized by the following scheme:

[0007] A flexible support gap adjustable sealing structure, at least including but not limited to a sealing cover, and sealing teeth adapted to a rotating component, wherein the sealing teeth are embedded in the end surface of the sealing cover close to the rotating component through a connecting cavity, an elastic element is arranged between the connecting cavity and the sealing teeth, a pull rod is arranged between the sealing cover and the sealing teeth, and a sealing gap is formed between the sealing teeth and the rotating component.

[0008] Based on the above-mentioned flexible support gap adjustable sealing structure, the sealing tooth is provided with an active cavity and a connecting groove connected to the pull rod; the active cavity is embedded in the sealing tooth, the active cavity is connected through the connecting groove, and the connecting groove is provided on the side wall of the sealing tooth.

[0009] Based on the above-mentioned flexible support gap adjustable sealing structure, the pull rod includes a screw, a plug and a connecting nut; the size of the plug is not larger than the size of the active cavity, so that the plug can move freely in the active cavity, the size of the screw is adapted to the size of the connecting groove, so that the screw can also slide freely relative to the connecting groove, and the size of the plug is not smaller than the size of the connecting groove, so that the plug cannot detach from the connecting groove.

[0010] Based on the above-mentioned flexible support gap adjustable sealing structure, the connecting nut is arranged on the end of the screw rod away from the screw plug, and the screw plug is provided with a thread groove matching the screw rod; the screw plug is connected to the screw rod through the thread groove.

[0011] Based on the above-mentioned flexible support gap adjustable sealing structure, the sealing cover is provided with a through slot for the screw to pass through, and the end of the screw away from the screw plug passes through the through slot and is connected to the connecting nut; a locking nut is also provided on the rear side of the connecting nut.

[0012] Based on the above-mentioned flexible support gap adjustable sealing structure, the connecting cavity is a diffuse structure as a whole.

[0013] Based on the above-mentioned flexible support gap adjustable sealing structure, the elastic element is a circular ring-shaped integral elastic structure or a discrete small-block elastic structure.

[0014] Based on the above-mentioned flexible support gap adjustable sealing structure, when the elastic element is an integral elastic structure in the shape of a circular ring, the connecting groove is arranged at the center position of the circular ring elastic structure.

[0015] Based on the above-mentioned flexible support gap adjustable sealing structure, when the elastic element is a discrete small elastic structure, the connecting groove is arranged at the geometric center position of a plurality of small elastic structures.

[0016] Based on the above-mentioned flexible support gap adjustable sealing structure, a protective cover is arranged on the end of the screw.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. In this solution, the sealing teeth are supported by elastic elements, which can adapt to the swing of the shaft under the condition of small gap sealing, avoid hard friction between the shaft and the sealing teeth, and improve wear and heat problems.

[0019] 2. The elastic element in this solution has a certain degree of adaptive adjustment capability, which can improve the uniformity and consistency of the sealing air gap during operation, and improve the sealing reliability and sealing effect.

[0020] 3. The adaptive adjustment capability of the elastic element in this solution can also reduce the requirements for the initial installation gap accuracy of the sealing device and shorten the installation cycle; at the same time, it avoids frequent gap adjustments during operation and reduces operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the pull rod in the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the diffuse connecting cavity in the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the utility model when a circular ring-shaped overall elastic structure is adopted;

[0025] Figure 5 This is a schematic diagram of the structure of the utility model when a small elastic structure is adopted;

[0026] Description of the drawings: 1. Sealing cover; 2. Sealing teeth; 3. Rotating part; 4. Elastic element; 5. Sealing gap; 6. Pull rod; 7. Connecting cavity; 21. Movable cavity; 22. Connecting groove; 61. Screw; 62. Screw plug; 63. Connecting nut; 64. Locking nut; 65. Protective cover; 41. Circular overall elastic structure; 42. Small elastic structure. DETAILED DESCRIPTION

[0027] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0028] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0031] Example 1

[0032] like Figure 1 to Figure 5 As shown, the utility model provides a technical solution:

[0033] A flexible support gap adjustable sealing structure, which at least includes but is not limited to a sealing cover 1, and a sealing tooth 2 adapted to a rotating component 3, the sealing tooth 2 is embedded on the end surface of the sealing cover 1 close to the rotating component 3 through a connecting cavity 7, an elastic element 4 is arranged between the connecting cavity 7 and the sealing tooth 2, a pull rod 6 is arranged between the sealing cover 1 and the sealing tooth 2, and a sealing gap 5 is formed between the sealing tooth 2 and the rotating component 3.

[0034] Based on the above structure, in this scheme, by arranging elastic elements 4 in the connecting cavity 7 and the sealing teeth 2, when the rotating component 3 moves toward the sealing teeth 2 and the sealing gap 5 is reduced, the elastic elements 4 connected to the sealing teeth 2 will be compressed synchronously to ensure the uniformity and consistency of the sealing reduction on the circumference. Conversely, when the rotating component 3 moves away from the sealing teeth 2 and the sealing gap 5 is increased, the elastic elements 4 connected to the sealing teeth 2 will generate a reverse force, thereby also ensuring the uniformity and consistency of the sealing on the circumference. Through this scheme, on the one hand, the damage to the sealing teeth 2 can be reduced and their service life can be extended. On the other hand, the uniformity and consistency of the sealing gap 5 on the circumference can also be ensured, so that the device can operate efficiently and safely. In this scheme, the pull rod 6 limits the extreme position of the sealing tooth 2 to prevent it from falling from the connecting cavity 7. At the same time, under the joint action of the elastic element 4 and the pull rod 6, the sealing tooth 2 is kept relatively stationary.

[0035] As an example, the sealing tooth 2 is provided with an active cavity 21 and a connecting groove 22 connected to the pull rod 6; the active cavity 21 is embedded in the sealing tooth 2, the active cavity 21 is connected through the connecting groove 22, and the connecting groove 22 is provided on the side wall of the sealing tooth 2.

[0036] Based on the above structure, the connection groove 22 is provided to provide a movement space for the pull rod 6 , and the movable cavity 21 is provided to provide a movement space for the elastic movement of the sealing tooth 2 .

[0037] As an example, the pull rod 6 may include a screw 61, a plug 62 and a connecting nut 63; the size of the plug 62 is not larger than the size of the active cavity 21, so that the plug 62 can move freely in the active cavity 21, the size of the screw 61 is adapted to the size of the connecting groove 22, so that the screw 61 can also slide freely relative to the connecting groove 22, and the size of the plug 62 is not smaller than the size of the connecting groove 22, so that the screw cover cannot detach from the connecting groove 22.

[0038] The connecting nut 63 is arranged on the end of the screw rod 61 away from the screw plug 62, and a thread groove matching the screw rod 61 is arranged in the screw plug 62; the screw plug 62 is connected to the screw rod 61 through the thread groove, the movable cavity 21 is a rectangular slot, and the screw plug 62 is also a rectangular structure as a whole. Of course, the screw plug can be an independent component connected to the screw rod through a thread. It can also be integrated with the screw rod, for example, the bolt head of the bolt itself is equivalent to the screw plug here.

[0039] Based on the above structure, the screw rod 61 passes through the connecting groove 22 and is connected to the screw plug 62 in the active cavity 21. Since the screw plug 62 and the active cavity 21 are both rectangular structures, the screw plug 62 can be tightened to the end of the screw rod 61 by rotating the screw rod 61. However, the screw plug 62 will not rotate due to the limitation of the rectangular structure, which can facilitate the disassembly and installation of the sealing tooth 2 in the later stage and reduce the difficulty of later maintenance.

[0040] As an example, the sealing cover 1 is provided with a through slot for the screw 61 to pass through, and the end of the screw 61 away from the screw plug 62 passes through the through slot and is connected to the connecting nut 63;

[0041] Based on the above structure, by screwing the connecting nut 63 in or out on the screw rod 61, and cooperating with the contact between the screw cover and the side wall of the active cavity 21, the sealing tooth 2 compresses the elastic element 4 to keep it in a predetermined position, and the screw plug 62 cooperates with the active cavity 21 so that the sealing tooth 2 can only move along the length direction of the active cavity 21. The elastic strength of the sealing tooth 2 can also be adjusted by adjusting the screwing amount of the connecting nut 63 to adapt to the needs of different sizes.

[0042] As an example, a locking nut 64 can also be provided on the rear side of the connecting nut 63. When in use, the connecting nut 63 is tightened to contact the sealing cover 1, and then the locking nut 64 is screwed in to lock the connecting nut 63 to prevent the connecting nut 63 from loosening during long-term work, thereby ensuring safety during use.

[0043] As an example, the connecting cavity 7 is a diffuse structure as a whole, that is, there is a certain gap between the connecting cavity 7 and the side wall of the sealing tooth 2 .

[0044] Based on the above structure, since the rotating component 3 may have a unidirectional slight tilting movement when moving, at this time, the divergent connecting cavity 7 provides movement space for the tilting movement of the sealing tooth 2 to avoid interference between the sealing tooth 2 and the side wall of the connecting cavity 7 and damage to the sealing tooth 2.

[0045] As an example, the elastic element 4 may be a circular ring-shaped integral elastic structure, or may be a discrete small-block elastic structure 42 .

[0046] When the elastic element 4 is an annular overall elastic structure 41 , the connecting groove 22 is arranged at the center of the annular elastic structure; this ensures that the elastic element 4 can support the sealing tooth 2 more evenly.

[0047] When the elastic element 4 is a discrete small elastic structure 42, the connecting groove 22 is arranged at the geometric center position of multiple small elastic structures 42. For example, when there are four small elastic structures 42, the small elastic structures 42 are respectively arranged in the four directions of up, down, left and right of the connecting groove 22. This can also ensure that the small elastic structure 42 can support the sealing tooth 2 more evenly.

[0048] As an example, a protective cover 65 may be provided on the end of the screw rod 61 , and the protective cover 65 can protect the connecting nut 63 and the locking nut 64 to prevent the external environment from damaging the nut and affecting subsequent maintenance.

[0049] In this solution, the sealing gap 5 is usually 0-0.5 mm.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible support gap adjustable sealing structure, characterized in that: At least includes but is not limited to a sealing cover, and a sealing tooth adapted to the rotating component, wherein the sealing tooth is embedded on the end face of the sealing cover close to the rotating component through a connecting cavity, an elastic element is arranged between the connecting cavity and the sealing tooth, a pull rod is arranged between the sealing cover and the sealing tooth, and a sealing gap is formed between the sealing tooth and the rotating component.

2. A flexible support gap adjustable sealing structure as claimed in claim 1, characterized in that: The sealing tooth is provided with an active cavity and a connecting groove connected with the pull rod; the active cavity is embedded in the sealing tooth, the active cavity is connected through the connecting groove, and the connecting groove is provided on the side wall of the sealing tooth.

3. A flexible support gap adjustable sealing structure as claimed in claim 2, characterized in that: The pull rod includes a screw, a plug and a connecting nut; the size of the plug is not larger than the size of the active cavity, so that the plug can move freely in the active cavity, the size of the screw is adapted to the size of the connecting groove, so that the screw can also slide freely relative to the connecting groove, and the size of the plug is not smaller than the size of the connecting groove, so that the plug cannot detach from the connecting groove.

4. A flexible support gap adjustable sealing structure as claimed in claim 3, characterized in that: The connecting nut is arranged on the end of the screw rod away from the screw plug, and a thread groove matching the screw rod is arranged in the screw plug; the screw plug is connected to the screw rod through the thread groove.

5. A flexible support gap adjustable sealing structure as claimed in claim 4, characterized in that: The sealing cover is provided with a through slot for the screw to pass through, and the end of the screw away from the screw plug passes through the through slot and is connected to the connecting nut; a locking nut is also provided on the rear side of the connecting nut.

6. A flexible support gap adjustable sealing structure as claimed in claim 5, characterized in that: The connecting cavity is a diffuse structure as a whole.

7. A flexible support gap adjustable sealing structure as claimed in claim 6, characterized in that: The elastic element is a circular ring-shaped integral elastic structure or a discrete small-block elastic structure.

8. A flexible support gap adjustable sealing structure as claimed in claim 7, characterized in that: When the elastic element is an integral elastic structure in an annular shape, the connecting groove is arranged at the center of the annular elastic structure.

9. A flexible support gap adjustable sealing structure as claimed in claim 7, characterized in that: When the elastic element is a discrete small elastic structure, the connecting groove is arranged at the geometric center position of the plurality of small elastic structures.

10. A flexible support gap adjustable sealing structure as claimed in any one of claims 3 to 9, characterized in that: A protective cover is arranged on the end of the screw.

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