Double-layer dynamic seal rotating shaft structure

Abstract

The invention belongs to the technical field of sealing structures, and particularly discloses a double-layer dynamic sealing rotating shaft structure which comprises a first dynamic sealing rotating shaft, and one end of the first dynamic sealing rotating shaft is connected with a component in a vacuum chamber; one end of the second dynamic sealing rotating shaft is connected with the other end of the first dynamic sealing rotating shaft, and the other end of the second dynamic sealing rotating shaft is connected with an external power component; the sealing unit is internally provided with a sealed cavity, the first dynamic sealing rotating shaft is located in the cavity, the second dynamic sealing rotating shaft is located on the outer side of the cavity, the first dynamic sealing rotating shaft and the second dynamic sealing rotating shaft are rotationally connected with the two sides of the cavity in a sealed mode correspondingly, and one side of the cavity communicates with a connecting pipe. And a detection unit for detecting the pressure change in the sealing cover is mounted on the connecting pipe. Under the condition that a single sealing structure loses efficacy, the vacuum sealing performance of the system can still be maintained, and conditions are provided for part replacement during shutdown.

Description

Technical Field

[0001] The invention relates to the technical field of sealing structures, and in particular to a double-layer dynamic sealing rotating shaft structure. Background Art

[0002] The commercially available dynamic seal shaft (or "dynamic seal guide") is a power transmission structure that can achieve power transmission on both sides of the airtight isolation part. Currently, this structure is widely used in vacuum sealing devices, spacecraft, tokamak devices and other systems.

[0003] The dynamic seal shaft usually adopts a bellows single-layer sealing structure. As needed, people or machines rotate the shaft on one side to transfer power to the other side. Because it is a bellows single-layer sealing structure, when external force destroys the structure, it will cause airtightness failure. This structure is not competent when it comes to special scenarios involving toxic and harmful substances (such as viruses, gases, radioactive substances) that require the overall airtightness of the system to be maintained under the condition of single-layer seal rupture, so it needs to be improved. Summary of the invention

[0004] The present invention provides a double-layer dynamic sealing shaft structure, the purpose of which is to maintain the vacuum sealing performance of the system when a single sealing structure fails.

[0005] The present invention is implemented by the following technical solutions: a double-layer dynamic seal rotating shaft structure, comprising a first dynamic seal rotating shaft, one end of which is connected to a component in a vacuum chamber;

[0006] a second dynamic seal rotating shaft, one end of the second dynamic seal rotating shaft being connected to the other end of the first dynamic seal rotating shaft, and the other end of the second dynamic seal rotating shaft being connected to an external power component;

[0007] A sealing unit, wherein the interior of the sealing unit is a sealed chamber, the first dynamic sealing rotating shaft is located in the chamber, the second dynamic sealing rotating shaft is located outside the chamber, and the first dynamic sealing rotating shaft and the second dynamic sealing rotating shaft are respectively connected to the two sides of the chamber in a sealed and rotatable manner, one side of the chamber is connected to a connecting pipe, and a detection unit for detecting pressure changes inside the sealing cover is installed on the connecting pipe.

[0008] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0009] In the present invention, a first dynamic seal rotating shaft and a second dynamic seal rotating shaft are used to form a double-layer sealing structure. When any of the dynamic seal rotating shafts is damaged, the pressure of the sealing chamber inside the sealing unit will change, and the detection unit will display that the sealing structure has been damaged in a single layer, and it is necessary to stop the machine to replace the dynamic seal rotating shaft to avoid disasters. In this way, when one of the dynamic seal rotating shafts fails, the other dynamic seal rotating shaft can still play a sealing role, so that the vacuum sealing of the entire system can continue to be maintained, providing conditions for stopping the machine to replace components.

[0010] A double-layer dynamic seal shaft structure in the present invention is suitable for equipment or systems where vacuum seal failure will lead to major disasters in application scenarios involving viruses, radioactive gases, etc.; in addition, the structure can also be used in scenarios such as manned spaceflight and aviation where seal failure will lead to major losses.

[0011] Further, the sealing unit comprises a sealing cover, a first vacuum flange and a second vacuum flange, wherein the first vacuum flange and the second vacuum flange are respectively connected to two ends of the sealing cover;

[0012] The first dynamic seal rotating shaft is located in the sealing cover, and one end of the first dynamic seal rotating shaft away from the second dynamic seal rotating shaft passes through the first vacuum flange, and the first dynamic seal rotating shaft and the second vacuum flange are sealed and rotated together; the second dynamic seal rotating shaft is located outside the sealing cover, and one end of the second dynamic seal rotating shaft close to the first dynamic seal rotating shaft passes through the second vacuum flange, and the second dynamic seal rotating shaft and the second vacuum flange are sealed and rotated together.

[0013] Beneficial effects: The sealing unit in this solution includes a sealing cover, a first vacuum flange and a second vacuum flange connection. The setting of the first vacuum flange and the second vacuum flange is convenient for connection and installation with other structures. Compared with setting the sealing unit as a whole, the structure of this solution is more convenient for installing the first dynamic sealing shaft into the sealing cover, and for the mutual connection between the first dynamic sealing shaft and the second sealing shaft.

[0014] Furthermore, the detection unit is a pressure gauge.

[0015] Beneficial effect: The detection unit of this scheme adopts a pressure gauge, which can directly measure the pressure change in the chamber of the sealing unit, so as to serve as an intuitive prompt, and then facilitate timely inspection and replacement of the corresponding dynamic seal shaft to avoid major losses.

[0016] Furthermore, the connecting pipe is connected to an air pumping and inflation system for inflating or exhausting air into the chamber of the sealing unit.

[0017] Beneficial effect: The pumping and charging system in this scheme can fill the chamber with gas in advance. Later, by comparing the pressure condition detected by the detection unit with the initial pressure state, it can be determined whether the dynamic sealing shaft structure is damaged, thereby facilitating timely maintenance and replacement to avoid disasters.

[0018] Furthermore, a connecting piece is coaxially connected between the first dynamic seal rotating shaft and the second dynamic seal rotating shaft.

[0019] Beneficial effect: In this solution, the connecting member serves as a connecting medium between the first dynamic seal rotating shaft and the second dynamic seal rotating shaft, so that the first dynamic seal rotating shaft and the second seal rotating shaft can be smoothly connected.

[0020] Furthermore, the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are coaxially fixedly connected or coaxially rotatably connected via the connecting member.

[0021] Beneficial effect: In this solution, the connection mode between the first dynamic seal rotating shaft and the second dynamic seal rotating shaft can be selected as a fixed connection or a rotating connection according to actual needs, so that the first dynamic seal rotating shaft and the second dynamic seal rotating shaft can rotate synchronously or with delayed rotation.

[0022] Furthermore, the connecting member is a bearing, and the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are rotatably connected via the bearing.

[0023] Beneficial effects: In this solution, the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are rotatably connected through bearings, and the connection method is stable and simple.

[0024] Furthermore, the connecting member is a connecting rod, and the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are fixedly connected by the connecting rod.

[0025] Furthermore, a flange interface is connected to the outer side of the second vacuum flange, a sealing gasket is provided between the flange interface and the second vacuum flange, the second dynamic sealing shaft is rotatably sealed and connected to the flange interface, and one end of the second dynamic sealing shaft passes through the flange interface and the second vacuum flange in sequence.

[0026] Beneficial effects: A flange interface is also provided in this solution, and a sealing gasket is also provided between the second vacuum flange and the double-layer structure of the flange interface, which can further enhance the sealing between the second dynamic sealing shaft and the chamber and is safer.

[0027] Furthermore, a protective cover is connected to the outer side of the sealing unit, and the second dynamic seal rotating shaft is located inside the protective cover.

[0028] Beneficial effect: The protective cover in this solution can protect the second dynamic seal rotating shaft and prevent the second dynamic seal rotating shaft from being damaged by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of one structure of a double-layer dynamic seal shaft structure of the present invention;

[0031] Figure 2 Another structural schematic diagram of a double-layer dynamic seal shaft structure of the present invention.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] The first vacuum flange 1, the first dynamic sealing shaft 2, the sealing cover 3, the connecting pipe 4, the flange interface 5, the second dynamic sealing shaft 6, the connecting piece 7, the second vacuum flange 8, the sealing gasket 9, and the protective cover 10. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0035] Example

[0036] like Figure 1 As shown, this embodiment provides a double-layer dynamic seal rotating shaft structure, including a first dynamic seal rotating shaft 2, one end of the first dynamic seal rotating shaft 2 is connected to a component in a vacuum chamber to drive the component in the vacuum chamber to move;

[0037] A second dynamic seal rotating shaft 6, one end of the second dynamic seal rotating shaft 6 is connected to the other end of the first dynamic seal rotating shaft 2, and the other end of the second dynamic seal rotating shaft 6 is connected to an external power component;

[0038] The sealing unit has a sealed chamber inside, the first dynamic sealing shaft 2 is located in the chamber, the second dynamic sealing shaft 6 is located outside the chamber, and the first dynamic sealing shaft 2 and the second dynamic sealing shaft 6 are respectively connected to the two sides of the chamber in a sealed rotation. Specifically: In this embodiment, the sealing unit includes a sealing cover 3, a first vacuum flange 1 and a second vacuum flange 8, the first vacuum flange 1 and the second vacuum flange 8 are respectively connected to the two ends of the sealing cover 3, and a relatively closed chamber is formed between the first vacuum flange 1, the second vacuum flange 8 and the sealing cover 3;

[0039] The first dynamic seal rotating shaft 2 is located in the sealing cover 3, and the end of the first dynamic seal rotating shaft 2 away from the second dynamic seal rotating shaft 6 passes through the first vacuum flange 1, and the first dynamic seal rotating shaft 2 and the second vacuum flange 8 are sealed and rotated together (dynamic seal); the second dynamic seal rotating shaft 6 is located outside the sealing cover 3, and the end of the second dynamic seal rotating shaft 6 close to the first dynamic seal rotating shaft 2 passes through the second vacuum flange 8, and the second dynamic seal rotating shaft 6 and the second vacuum flange 8 are sealed and rotated together.

[0040] In another embodiment, the outer side of the second vacuum flange 8 is connected with a flange interface 5 by bolts, and a sealing gasket 9 is provided between the flange interface 5 and the second vacuum flange 8. The sealing gasket 9 can ensure the sealing between the flange interface 5 and the second vacuum flange 8. The second dynamic sealing shaft 6 is rotatably sealed and connected to the flange interface 5, and one end of the second dynamic sealing shaft 6 passes through the flange interface 5 and the second vacuum flange 8 in sequence and is connected to one end of the first dynamic sealing shaft 2.

[0041] Back to the present embodiment, a connector 7 is coaxially connected between the first dynamic seal rotating shaft 2 and the second dynamic seal rotating shaft 6, and the first dynamic seal rotating shaft 2 and the second dynamic seal rotating shaft 6 are coaxially fixedly connected or coaxially rotatably connected through the connector 7. In the present embodiment, the connector 7 is a connecting rod, and the first dynamic seal rotating shaft 2 and the second dynamic seal rotating shaft 6 are fixedly connected through the connecting rod. The connecting rod is an internal hollow structure, and the two ends of the connecting rod are respectively sleeved on the output ends of the first dynamic seal rotating shaft 2 and the second dynamic seal rotating shaft 6 and connected and fixed through the cooperation of the key and the keyway. In another embodiment, the connector 7 is a bearing, and the first dynamic seal rotating shaft 2 and the second dynamic seal rotating shaft 6 are rotatably connected through the bearing.

[0042] One side of the chamber is connected with a connecting pipe 4, and the connecting pipe 4 is vertically connected to the sealing cover 3. The connecting pipe 4 is connected to the chamber. A detection unit for detecting the pressure change inside the sealing cover 3 is installed on the connecting pipe 4. In this embodiment, the detection unit is a pressure gauge. In another embodiment, the connecting pipe 4 is also connected with an exhaust system and an inflation system. The exhaust system and the inflation system are used for exhausting and ventilation. When the entire structure is installed in place, the inflation system fills the sealing cover 3 with suitable gas, such as nitrogen, neon, etc. Due to the continuous leakage of air, the air pressure inside the sealing cover 3 will continue to increase. If there is no exhaust system, the atmosphere will leak in. In this embodiment, the exhaust system and the inflation system are connected to the connecting pipe 4, which can exhaust and inflate the sealing cover 3 to ensure safety and sealing.

[0043] In this embodiment, the connecting pipe 4 is also connected to a pumping and inflation system for inflating or exhausting air into the chamber of the sealing unit through a pipeline. The pumping and inflation system pre-fills the chamber of the sealing cover 3 with non-toxic gas, such as nitrogen, so that the chamber of the sealing cover 3 has a certain pressure, and records the pressure value of the pressure gauge at this time. In another embodiment, an alarm system is also provided. The alarm system is electrically connected to the pressure gauge. The alarm system includes a controller, an alarm light or a display, etc. When the pressure gauge exceeds the set value, an alarm or display will be issued to remind the replacement and inspection of the dynamic seal shaft structure.

[0044] In another embodiment, Figure 2 As shown, a protective cover 10 is also connected to the outside of the sealing unit, and the second dynamic seal shaft 6 is located in the protective cover 10. In this embodiment, one end of the protective cover 10 is connected to the right end of the sealing cover 3. The protective cover 10 can protect the second dynamic seal shaft to avoid failure due to the impact damage of the second dynamic seal shaft 6 due to its location outside.

[0045] The specific implementation process is as follows:

[0046] When the first dynamic seal shaft 2 fails, the inside and outside of the first vacuum flange 1 are connected, the air pressure inside the sealing cover 3 will be equal to the air pressure on the left side of the first vacuum flange 1, the barometer will change, and the system will sound an alarm to remind you to replace and repair the dynamic seal shaft structure of the present invention;

[0047] When the second dynamic sealing shaft 6 fails, the chamber of the sealing cover 3 will be connected to the atmosphere, the air pressure in the sealing cover 3 will be equal to the atmospheric pressure, the barometer will change, and the system will also sound an alarm; in this way, under double protection, after the vacuum seal of a single dynamic sealing shaft fails, the other dynamic sealing shaft is still in a sealed state, and the entire system can still maintain airtightness, providing conditions for shutting down for component replacement.

[0048] The structure of the present invention has a very wide range of applications and can be applied to equipment or systems where vacuum seal failure will lead to major disasters in application scenarios involving viruses, radioactive gases, etc. In addition, the device can also be used in scenarios such as manned space flight and aviation where seal failure will lead to major losses.

[0049] In addition, the present invention is applied to a deuterium-tritium nuclear fusion device, and it is necessary to use a dynamic seal shaft from the atmosphere side to control the components inside the tokamak device. In order to avoid tritium leakage due to failure of the dynamic seal shaft, it is necessary to use the dynamic seal shaft structure with double protection of the present invention.

[0050] In a sealed cabinet containing extremely dangerous viruses, a dynamic sealing shaft with double protection is needed to move the culture dish inside the cabinet. In this scenario, the dynamic sealing shaft structure with double protection of the present invention needs to be used.

[0051] In an experimental chamber filled with tritium (or radon) gas, if it is necessary to control the components in the chamber from the outside, it is also necessary to use the dynamic sealing shaft structure with double protection of the present invention.

[0052] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

[0053] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0054] In the description of this document, terms such as "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0055] In the description of this document, some terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0056] In the description of this document, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing book for technical personnel in this field to understand and read, and are not used to limit the restrictive conditions for the implementation of this application. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0058] The terms used in this document are those common terms currently widely used in the art in consideration of the functions of the present disclosure, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as an overall description based on the meaning of the terms and the present disclosure.

[0059] Flowcharts or text are used in this document to illustrate the operating steps performed according to the embodiments of the present application. It should be understood that the operating steps in the embodiments of the present application are not necessarily accurately performed in the order of recording. On the contrary, various steps can be processed in reverse order or simultaneously as needed. At the same time, other operations can also be added to these processes, or a certain step or several steps can be removed from these processes.

[0060] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A double-layer dynamic seal shaft structure, characterized in that: It includes a first dynamic seal rotating shaft, one end of which is connected to a component in the vacuum chamber; a second dynamic seal rotating shaft, one end of the second dynamic seal rotating shaft being connected to the other end of the first dynamic seal rotating shaft, and the other end of the second dynamic seal rotating shaft being connected to an external power component; A sealing unit, wherein the interior of the sealing unit is a sealed chamber, the first dynamic sealing rotating shaft is located in the chamber, the second dynamic sealing rotating shaft is located outside the chamber, and the first dynamic sealing rotating shaft and the second dynamic sealing rotating shaft are respectively connected to the two sides of the chamber in a sealed and rotatable manner, one side of the chamber is connected to a connecting pipe, and a detection unit for detecting pressure changes inside the sealing cover is installed on the connecting pipe.

2. A double-layer dynamic seal shaft structure according to claim 1, characterized in that: The sealing unit comprises a sealing cover, a first vacuum flange and a second vacuum flange, wherein the first vacuum flange and the second vacuum flange are respectively connected to two ends of the sealing cover; The first dynamic seal rotating shaft is located in the sealing cover, and one end of the first dynamic seal rotating shaft away from the second dynamic seal rotating shaft passes through the first vacuum flange, and the first dynamic seal rotating shaft and the second vacuum flange are sealed and rotated together; the second dynamic seal rotating shaft is located outside the sealing cover, and one end of the second dynamic seal rotating shaft close to the first dynamic seal rotating shaft passes through the second vacuum flange, and the second dynamic seal rotating shaft and the second vacuum flange are sealed and rotated together.

3. A double-layer dynamic seal shaft structure according to claim 1, characterized in that: The detection unit is a pressure gauge.

4. A double-layer dynamic seal shaft structure according to claim 1, characterized in that: The connecting pipe is connected to an air pumping and inflation system for inflating or exhausting air into the chamber of the sealing unit.

5. A double-layer dynamic seal shaft structure according to any one of claims 1 to 4, characterized in that: A connecting piece is coaxially connected between the first dynamic seal rotating shaft and the second dynamic seal rotating shaft.

6. A double-layer dynamic seal shaft structure according to claim 5, characterized in that: The first dynamic seal rotating shaft and the second dynamic seal rotating shaft are coaxially fixedly connected or coaxially rotatably connected via the connecting member.

7. A double-layer dynamic seal shaft structure according to claim 6, characterized in that: The connecting member is a bearing, and the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are rotatably connected via the bearing.

8. The double-layer dynamic seal shaft structure according to claim 6, characterized in that: The connecting member is a connecting rod, and the first dynamic seal rotating shaft and the second dynamic seal rotating shaft are fixedly connected by the connecting rod.

9. The double-layer dynamic seal shaft structure according to claim 2, characterized in that: A flange interface is connected to the outer side of the second vacuum flange, a sealing gasket is provided between the flange interface and the second vacuum flange, the second dynamic sealing shaft is rotationally sealedly connected to the flange interface, and one end of the second dynamic sealing shaft passes through the flange interface and the second vacuum flange in sequence.

10. The double-layer dynamic seal shaft structure according to claim 1, characterized in that: The outer side of the sealing unit is also connected with a protective cover, and the second dynamic seal rotating shaft is located inside the protective cover.

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