A stacked local high vacuum rotary dynamic sealing device

Abstract

The present invention discloses a stacked local high-vacuum rotary dynamic sealing device, which relates to the technical field of dynamic sealing devices. The main structure comprises a plurality of stacked flanges, an end rotating flange and an outer cylinder which are sequentially sleeved on the shaft to be welded along the axial direction of the shaft to be welded, and a vacuum sealing gasket arranged between the plurality of stacked flanges and the stacked flanges and the end rotating flanges; the plurality of stacked flanges, the vacuum sealing gasket and the end rotating flange rotate synchronously with the shaft to be welded, and there is no sliding friction between the shaft to be welded and the sealing parts. Therefore, the surface smoothness and roundness of the shaft to be welded have no effect on the sealing effect, thereby enhancing the sealing effect, so that only the part of the shaft to be welded that needs to be welded needs to be extended into a high vacuum welding chamber, and there is no need to build an oversized high vacuum welding chamber.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic sealing devices, in particular to a stacked local high vacuum rotary dynamic sealing device. Background Art

[0002] For high vacuum electron beam welding of long or extra-long shaft parts, it is usually necessary to design a long or extra-long high vacuum electron beam welding equipment for welding. In order to put long or extra-long parts into a vacuum for welding, it is necessary to manufacture a high vacuum welding chamber that is longer than the long or extra-long parts, and at the same time, it is necessary to put various fixtures and motion mechanisms into the vacuum chamber, so the high vacuum welding chamber needs to be made very large. Such a large high vacuum welding chamber needs to be equipped with a high-power vacuum pumping device. The entire electron beam welding equipment is not only expensive to manufacture, but also has high operating costs.

[0003] In addition, the conventional axial dynamic sealing method is that when the parts to be welded are rotating, the seal slides and rubs directly on the shaft of the parts to be welded to seal. This requires that the shaft surface of the parts to be welded is smooth and the roundness is also required to be high. Otherwise, the sealing effect will be poor, and the requirements of high vacuum sealing will not be met. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a stacked local high vacuum rotary dynamic sealing device, which places the part of a long or extra-long part to be welded into a vacuum chamber, thereby eliminating the need to build a large high vacuum welding chamber and reducing the requirements for the smoothness and roundness of the shaft surface of the part to be welded.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a stacked local high vacuum rotary dynamic sealing device, comprising a plurality of stacked flanges, an end rotating flange and an outer cylinder which are sequentially sleeved on a shaft to be welded along the axial direction of the shaft to be welded; vacuum sealing gaskets are arranged between the plurality of stacked flanges and the stacked flanges and the end rotating flanges; the outer cylinder is fixedly arranged on the outer side wall of a high vacuum welding chamber, an inner cylinder is sleeved on the inner side of the outer cylinder, and a bearing is arranged between the inner cylinder and the outer cylinder; the end rotating flange is connected to the end of the inner cylinder away from the high vacuum welding chamber, and a sealing structure is arranged between the end rotating flange and the outer cylinder.

[0007] Optionally, the stacked flange includes an upper flange and a lower flange which are cut into two parts along the diameter.

[0008] Optionally, the inner diameter of the vacuum sealing pad is smaller than the diameter of the shaft to be welded.

[0009] Optionally, an outer ring pressure cover is provided on the outer cylinder between the bearing and the outer side wall of the high vacuum welding chamber; and an inner ring pressure cover is provided on the inner cylinder between the bearing and the outer side wall of the high vacuum welding chamber.

[0010] Optionally, two bearings are arranged between the inner cylinder and the outer cylinder, and an inner sleeve is arranged between the two bearings, and the inner sleeve is used to separate the two bearings.

[0011] Optionally, the sealing structure includes two lip sealing rings arranged in parallel, and a sealing gasket is arranged between the two lip sealing rings.

[0012] Optionally, an oil passage is provided between the two lip seal rings, an oil port connected to the oil passage is provided on the end rotating flange, and an oil plug is provided on the oil port.

[0013] Optionally, a sealing ring is provided at the end of the end rotating flange close to the high vacuum welding chamber.

[0014] Optionally, an O-ring is provided between the end rotating flange and the end of the inner tube.

[0015] Optionally, an O-ring is provided between the outer cylinder and the outer side wall of the high vacuum welding chamber.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The main structure of the stacked local high vacuum rotary dynamic sealing device in the present invention includes a plurality of stacked flanges, an end rotating flange and an outer cylinder which are sequentially sleeved on the shaft to be welded along the axial direction of the shaft to be welded, and a vacuum sealing gasket arranged between the plurality of stacked flanges and the stacked flanges and the end rotating flanges; the plurality of stacked flanges, the vacuum sealing gasket and the end rotating flange rotate synchronously with the shaft to be welded, and there is no sliding friction between the shaft to be welded and the sealing parts. Therefore, the surface smoothness and roundness of the shaft to be welded have no effect on the sealing effect, thereby enhancing the sealing effect, so that only the part of the shaft to be welded that needs to be welded needs to be extended into the high vacuum welding chamber, and there is no need to build an oversized high vacuum welding chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a laminated local high vacuum rotary dynamic sealing device of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the stacked flange in the stacked partial high vacuum rotary dynamic seal device of the present invention;

[0021] Figure 3 It is a schematic diagram of the lateral structure of the stacked flange in the stacked partial high vacuum rotary dynamic sealing device of the present invention.

[0022] Explanation of the reference numerals: 1. stacked flange; 2. vacuum sealing gasket; 3. end rotating flange; 4. sealing spacer; 5. oil plug; 6. sealing ring; 7. inner cylinder; 8. outer cylinder; 9. inner sleeve; 10. outer ring pressure cover; 11. inner ring pressure cover; 12. first hexagon socket screw; 13. second hexagon socket screw; 14. first O-ring; 15. second O-ring; 16. lip seal; 17. third hexagon socket screw; 18. deep groove ball bearing; 19. fourth hexagon socket screw; 20. fifth hexagon socket screw; 21. third O-ring; 22. high vacuum welding chamber; 23. shaft to be welded; 1-1. upper flange; 1-2. lower flange. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] like Figure 1 As shown, this embodiment provides a stacked local high vacuum rotary dynamic sealing device, including a plurality of stacked flanges 1, an end rotating flange 3 and an outer cylinder 8 which are sequentially sleeved on the shaft to be welded 23 along the axial direction of the shaft to be welded 23; a vacuum sealing gasket 2 is arranged between the plurality of stacked flanges 1 and the stacked flange 1 and the end rotating flange 3; the outer cylinder 8 is fixedly arranged on the outer wall of the high vacuum welding chamber 22, an inner cylinder 7 is sleeved on the inner side of the outer cylinder 8, and a bearing is arranged between the inner cylinder 7 and the outer cylinder 8; the end rotating flange 3 is connected to the end of the inner cylinder 7 away from the high vacuum welding chamber 22, and a sealing structure is arranged between the end rotating flange 3 and the outer cylinder 8.

[0026] In this specific embodiment, Figure 1-3As shown, the outer cylinder 8 is installed on the side wall of the high vacuum welding chamber 22 by the fourth hexagon socket screw 19, and a third O-ring 21 is installed between the outer cylinder 8 and the side wall of the high vacuum welding chamber 22. Two deep groove ball bearings 18 are installed in the outer cylinder 8, and the two deep groove ball bearings 18 are separated by an inner sleeve 9. The inner cylinder 7 is installed on the inner diameter of the deep groove ball bearing 18. The outer ring gland 10 is fixed to the outer cylinder 8 by the fifth hexagon socket screw 20 to compress the outer ring of the bearing. Similarly, the inner ring gland 11 is fixed to the inner cylinder 7 by the sixth hexagon socket screw to compress the inner ring of the bearing. The end rotating flange 3 is fixed to the inner cylinder 7 by a second hexagon socket screw 13, and a first O-ring 14 and a second O-ring 15 are installed on the left end surface of the end rotating flange 3 and the inner cylinder 7, and the second O-ring 15 is located on the outside of the first O-ring 14, and two lip-shaped sealing rings 16 are installed between the end rotating flange 3 and the outer cylinder 8. The inner diameter of the lip-shaped sealing ring 16 is pressed against the outer diameter of the left end of the outer cylinder 8, and a sealing spacer 4 is installed between the two lip-shaped sealing rings 16. A sealing ring retaining ring 6 is installed on the right end surface of the end rotating flange 3 by a third hexagon socket screw 17, and the two lip-shaped sealing rings 16 are pressed against the inner diameter groove of the end rotating flange 3. A refueling hole is opened on the end rotating flange 3 at a position between the two rotating shaft lip-shaped sealing rings 16, and the oil port is usually blocked by an oil plug 5. The stacked flange 1 is installed to the end face of the end rotating flange 3 through the first hexagon socket screw 12 and connected to each other layer by layer. A vacuum seal 2 is pressed between each layer. The inner diameter of the vacuum seal 2 is slightly smaller than the diameter of the shaft 23 to be welded at this place by 0.5-1 mm. When the stacked flange 1 is pressed layer by layer, the vacuum seal 2 tightly embraces the shaft 23 to be welded, and a good static vacuum seal is achieved between the vacuum seal 2 and the shaft 23 to be welded. In this device, the stacked flange 1, the end rotating flange 3, the inner cylinder 7, etc., embrace the shaft 23 to be welded through the vacuum seal 2, and rotate with the shaft 23 to be welded. The rotary dynamic seal is achieved by two lip seals 16 relative to the high-precision surface and shape of the outer cylinder 8 to achieve high vacuum rotary dynamic seal.

[0027] The vacuum sealing pad 2 is an annular rubber pad.

[0028] The stacked flange 1 is provided with three or more layers, and each layer is composed of two semicircles forming a circle, such as Figure 2-3 The stacked flange 1 includes an upper flange 1-1 and a lower flange 1-2.

[0029] During welding, the vacuum sealing gasket 2 is inserted into the shaft 23 to be welded, and then the right end of the shaft 23 to be welded is placed in the high vacuum welding chamber 22 to dock with the part to be welded. The left end is in the atmosphere and can be infinitely stretched to the required length. After the welding parts are installed, the stacking flanges 1 are installed one by one between the vacuum rubber sealing gaskets that have been put on in advance. After pressing each layer tightly, the electron beam equipment is evacuated and welding can begin.

[0030] For welding parts with different shaft diameters, the laminated flange 1 and vacuum rubber sealing ring gasket of the corresponding shaft diameter are processed to realize the local high vacuum rotary dynamic sealing welding of various shaft diameters.

[0031] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A stacked local high vacuum rotary dynamic sealing device, characterized in that: It comprises a plurality of stacked flanges, an end rotating flange and an outer cylinder which are sequentially sleeved on the shaft to be welded along the axial direction of the shaft to be welded; a vacuum sealing gasket is arranged between the plurality of stacked flanges and the stacked flanges and the end rotating flange; the outer cylinder is fixedly arranged on the outer side wall of the high vacuum welding chamber, an inner cylinder is sleeved on the inner side of the outer cylinder, and a bearing is arranged between the inner cylinder and the outer cylinder; the end rotating flange is connected to the end of the inner cylinder away from the high vacuum welding chamber, and a sealing structure is arranged between the end rotating flange and the outer cylinder; the stacked flange comprises an upper flange and a lower flange which are cut into two parts along the diameter; the inner diameter of the vacuum sealing gasket is smaller than the diameter of the shaft to be welded.

2. The stacked partial high vacuum rotary dynamic sealing device according to claim 1, characterized in that: An outer ring pressure cover is arranged on the outer cylinder between the bearing and the outer side wall of the high vacuum welding chamber; an inner ring pressure cover is arranged on the inner cylinder between the bearing and the outer side wall of the high vacuum welding chamber.

3. The stacked partial high vacuum rotary dynamic seal device according to claim 1, characterized in that: Two bearings are arranged between the inner cylinder and the outer cylinder, and an inner sleeve is arranged between the two bearings, and the inner sleeve is used to separate the two bearings.

4. The stacked partial high vacuum rotary dynamic seal device according to claim 1, characterized in that: The sealing structure comprises two lip-shaped sealing rings arranged in parallel, and a sealing spacer is arranged between the two lip-shaped sealing rings.

5. The stacked partial high vacuum rotary dynamic seal device according to claim 4, characterized in that: An oil passage is arranged between the two lip seal rings, an oil port connected with the oil passage is arranged on the end rotating flange, and an oil plug is arranged on the oil port.

6. The stacked partial high vacuum rotary dynamic seal device according to claim 4, characterized in that: The end of the end rotating flange close to the high vacuum welding chamber is provided with a sealing ring.

7. The stacked partial high vacuum rotary dynamic seal device according to claim 1, characterized in that: An O-type sealing ring is arranged between the end rotating flange and the end of the inner cylinder.

8. The stacked partial high vacuum rotary dynamic seal device according to claim 1, characterized in that: An O-type sealing ring is arranged between the outer cylinder and the outer side wall of the high vacuum welding chamber.

Images