A universal tube-penetrating vacuum sealing structure

Abstract

The present invention discloses a universal tube-penetrating vacuum sealing structure, including a tubular tube-penetrating, a tube-penetrating bottom tube surrounding the outer surface of the tubular tube-penetrating, the tube-penetrating bottom tube being provided with a thick end and a thin end, the thick end face being compressed between a screw and a sealing flange, and also including a first sealing groove and a first sealing ring, and a second sealing groove and a second sealing ring, the tube-penetrating bottom tube having an inner diameter large enough: inner cores of different apertures can be inserted between the tube-penetrating bottom tube and the tube-penetrating in a loose-fitting manner, the inner cores of different apertures are matched with tubes of different diameters to meet the need for changing the tube-penetrating diameter without replacing the tube-penetrating bottom tube. By designing the gap between the tube-penetrating, the inner core and the tube-penetrating bottom tube, the requirements of convenient installation and disassembly and ensuring a sealed vacuum can be achieved, avoiding the problem of long installation time and the need to disassemble and assemble other equipment installed on the mother part caused by replacing or repairing the mother part by the traditional method.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum sealing, and in particular relates to a universal tube-penetrating vacuum sealing structure. Background Art

[0002] In vacuum equipment, it is often encountered that pipelines are led out of the vacuum. According to different pipe diameters, corresponding pipe openings with different inner diameters need to be reserved. When the diameter of the pipe to be led out changes, there are usually two methods: if time permits, remove the mother part from the equipment, cut off the pipe that needs to be replaced on the mother part, and replace it with a new pipe. Because it needs to be re-welded after cutting, leaks are inevitable during the welding process. Therefore, the mother part needs to be re-leak-checked after welding, and corresponding leak detection tools and personnel equipment are equipped; but in most cases, such a long time for repair and leak detection is not allowed, and there are strict restrictions on the replacement time of equipment; in most cases where time is not allowed, in order to meet the requirements of rapid replacement, when the pipe diameter changes, the entire pipe mother part is often directly replaced, so that the replacement of the entire part is much faster than cutting a single pipe. However, whether it is repairing or replacing a new mother part, the equipment needs to be dismantled: many pipes connected to the equipment on the old mother part need to be removed one by one, and when replacing the new mother part, the pipes need to be re-installed one by one, which is very time-consuming. In addition, the economic cost of directly replacing the mother part is also very high, such as Figure 1 As shown in the figure, the tube mother part of the cyclotron gathers all the water and circuit pipes, and all the water and circuit pipes must pass through the tube mother part. If a new mother part is remade and replaced because of the change of the diameter of one of the tubes, the economic cost will be more than ten times higher. At the same time, after the accelerator has been running for a period of time, the radiation dose level in the working environment will generally be higher. For the staff who have to disassemble and assemble the equipment in this environment, the shorter the time required for equipment maintenance, the less harm to the personnel.

[0003] In summary, when the diameter of the pipe is changed, the prior art has not found a fast and low-cost method, or the replacement time is long, or additional workload and time and economic costs are generated. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a universal tube-penetrating vacuum sealing structure, aiming to solve the problem of long replacement time, extra workload, time and economic cost when the tube-penetrating diameter changes.

[0005] The present invention proposes the following technical solutions to solve the technical problems.

[0006] A universal tube-penetrating vacuum sealing structure comprises a tubular tube-penetrating and a tube-penetrating bottom tube surrounding the outer surface of the tubular tube-penetrating. The tube-penetrating bottom tube is provided with a thick end and a thin end. The thick end face is pressed between a screw and a sealing flange. The tube-penetrating bottom tube also comprises a first sealing groove and a first sealing ring, and a second sealing groove and a second sealing ring. The structure is characterized in that the inner diameter of the tube-penetrating bottom tube is large enough: inner cores with different apertures can be inserted between the tube-penetrating bottom tube and the tube in a loose fit manner. The inner cores with different apertures cooperate with tubes with different diameters to meet the need for changing the tube-penetrating diameter without replacing the tube-penetrating bottom tube.

[0007] The inner core is also provided with a thick end and a thin end. A step whose diameter and thickness match the diameter and thickness of the thick end face of the inner core is provided on the thick end face of the bottom tube, and the thick end face of the inner core is embedded in the step. The step is used to ensure the compression and vacuum sealing between the thick end face of the inner core and the flange end cover.

[0008] A first sealing groove and a sealing ring are provided at the center of the thick end surface of the inner core around the periphery of the through-tube, and the sealing ring is used to block the air from entering the gap between the inner core and the through-tube and between the inner core and the flange end cover to ensure the vacuum seal there; a second sealing groove and a sealing ring are provided circumferentially at the thick end surface of the through-tube bottom tube near the large radius of the screw, and the sealing groove and the sealing ring are used to block the air from entering the gap between the through-tube bottom tube and the flange end cover to ensure the vacuum seal there.

[0009] The gap between the inner core and the bottom tube of the tube is selected according to the following standards: the position where the thick end of the inner core matches with the bottom tube of the tube, a gap of 0.5 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 1 mm; the position where the thin end of the inner core matches with the bottom tube of the tube, a gap of 0.1 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.2 mm; the position where the inner core matches with the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.3 mm; the position where the sealing flange matches with the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.3 mm. This can ensure the vacuum sealing of the tube and facilitate on-site assembly.

[0010] Advantages and effects of the present invention

[0011] 1. The universal tube-penetrating structure of the present invention adopts a large gap between the tube-penetrating and the tube-penetrating bottom tube, so that the tube-penetrating is easier to pass out from the inside to the outside. After the tube-penetrating is passed out, the inner core is inserted from the outside. By designing the gap between the tube-penetrating, the inner core and the tube-penetrating bottom tube, it can be convenient to install and disassemble, and can ensure the requirements of sealing vacuum. It is more convenient in that it avoids the problem of long installation time and the need to disassemble and assemble other equipment installed on the mother part caused by replacing or repairing the mother part by traditional methods. At the same time, when the outer diameter of the tube-penetrating does not match the design or needs to be changed, the above problem can be solved by changing the inner core.

[0012] 2. The present invention achieves unexpected effects by changing the correspondence between the elements. The change in the correspondence between the elements is to change the correspondence between the inner diameter of the bottom tube and the outer diameter of the tube. The inner diameter of the bottom tube is approximately equal to the outer diameter of the tube before the improvement, and the inner diameter of the bottom tube is improved to be larger than the outer diameter of the tube. Since the gap between them is increased, an inner core and a sealing structure can be added between the bottom tube and the tube. By adjusting the size of the inner core, the requirements for vacuum sealing of tubes with different diameters can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the application effect diagram of the pipe-penetrating vacuum sealing structure;

[0014] Figure 2 This is a structural diagram of a conventional vacuum sealing method for pipe penetration in the prior art;

[0015] Figure 3 This is a structural diagram of the vacuum sealing method of the universal tube penetration in this application;

[0016] In the figure, 1: tube-penetrating mother part; 2: conventional tube-penetrating vacuum sealing structural part; 3: universal tube-penetrating vacuum sealing structural part; 2-1: tube-penetrating; 2-2: tube-penetrating bottom tube; 2-3: sealing flange; 2-4: screw; 2-5: sealing ring; 3-1: tube-penetrating; 3-2: tube-penetrating bottom tube; 3-3: inner core; 3-4: sealing ring; 3-5: sealing flange; 3-6: screw; 3-7. Sealing ring. DETAILED DESCRIPTION

[0017] The technical solution is further explained below in conjunction with the accompanying drawings:

[0018] Principle of the Invention

[0019] 1. The problem of using the cutting method to replace perforated sealing structures of different diameters. The connection between the tube sealing structure and the mother part is achieved by welding the outer tube bottom tube and the mother part together. When replacing tubes with different apertures, the entire sealing structure must be cut off from the mother part. When the tube sealing structure is replaced with a new tube, the tube bottom tube and the mother part are welded again. Since pores will be generated when the weldment is in contact with the air during the welding process, vacuum will leak when the pores exceed the allowable range, which is called a leak. The detection of leaks is very troublesome and time-consuming, and each time the leak is detected, it is necessary to repeatedly repair the welding until the vacuum requirement is met. The cause of the leak is the welding process that occurred when the tube and the tube sealing structure were replaced.

[0020] 2. Solve the problem by avoiding the welding step. If a method is adopted, when replacing tubes with different apertures, the cutting step can be omitted, and the welding step can be avoided by simply pulling out the tube in the tube sealing structure for replacement. The method adopted by the present invention is to start with changing the inner diameter of the tube bottom tube. In the traditional method, the inner diameter of the tube bottom tube is approximately equal to the outer diameter of the tube for a tight fit, while the inner diameter of the tube bottom tube of the present invention is larger than the outer diameter of the tube, and an inner core is added between the tube bottom tube and the tube. The function of the inner core is to fix and adjust the radial position of the tube in the tube bottom tube. As the outer diameter of the tube changes, the inner diameter of the inner core is adjusted accordingly to meet the function of fixing the tube in the radial position. (Since the tube bottom tube does not change, the outer diameter of the inner core does not need to change)

[0021] 3. It is not enough to just avoid vacuum leakage between the tube bottom tube and the mother part. It is also necessary to ensure that there is no vacuum leakage between the tube bottom tube and the inner core, and between the inner core and the tube. If the vacuum seal cannot be guaranteed when installing the tube bottom tube and the inner core, or the sealing between the tube and the inner core, and between the tube bottom tube and the inner core is not good enough, it is also necessary to re-measure the leak hole in the same way as the leak detection hole after welding. The method adopted by the present invention is: a sealing ring is added to any place where there is a gap. Since the inner core is added, a gap between the inner core and the tube bottom tube is also added. A sealing groove and a sealing ring are added to the newly added gap. In addition, the matching degree between the tube, the tube bottom tube and the inner core must be ensured. If the matching is too tight, it is not convenient for installation, and if the matching is too loose, the vacuum seal cannot be guaranteed. Therefore, the present invention adopts the following four sets of installation dimensions: at the position where the thick end of the inner core matches the tube bottom tube, a gap of 0.5 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 1 mm; at the position where the thin end of the inner core 3-3 matches the tube bottom tube 3-2, a gap of 0.1 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.2 mm; at the position where the inner core 3-3 matches the tube 3-1, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm; at the position where the sealing flange matches the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm. It has been proved by experiments that this can not only ensure the vacuum seal of the tube, but also facilitate on-site assembly.

[0022] Based on the above invention principle, the present invention designs a universal tube-penetrating vacuum sealing structure.

[0023] A universal tube-penetrating vacuum sealing structure such as Figure 3 As shown, it includes a tubular through-tube 3-1, a through-tube bottom tube 3-2 surrounded by the outer surface of the tubular through-tube 3-1, the through-tube bottom tube 3-2 is provided with a thick end and a thin end, the thick end face is pressed between the sealing flange 3-5 by a screw 3-6, and also includes a first sealing groove and a first sealing ring 3-4, and a second sealing groove and a second sealing ring 3-7, characterized in that: the inner diameter of the through-tube bottom tube is large enough: the inner core 3-3 with different apertures can be inserted between the through-tube bottom tube 3-2 and the through-tube 3-1 in a loose fit manner, and the inner core 3-3 with different apertures cooperates with the through-tube 3-1 with different pipe diameters to meet the demand for changing the diameter of the through-tube without replacing the through-tube bottom tube 3-2.

[0024] The inner core 3-3 is also provided with a thick end and a thin end. A step whose diameter and thickness match the diameter and thickness of the thick end face of the inner core is provided on the end face of the thick end of the bottom tube, and the thick end face of the inner core is embedded in the step. The step is used to ensure the compression and vacuum sealing between the thick end face of the inner core and the flange end cover.

[0025] A first sealing groove and a sealing ring 3-7 are provided around the center of the thick end face of the inner core around the penetration tube, and the sealing ring 3-7 is used to block the air from entering the gap between the inner core and the penetration tube and between the inner core and the flange end cover to ensure the vacuum seal there; a second sealing groove and a sealing ring 3-4 are circumferentially provided at the thick end face of the penetration bottom tube near the large radius of the screw 3-6, and the sealing groove and the sealing ring 3-4 are used to block the air from entering the gap between the penetration bottom tube and the flange end cover to ensure the vacuum seal there.

[0026] The gap between the inner core 3-3 and the bottom tube 3-2 is selected according to the following standards: the position where the thick end of the inner core matches the bottom tube 3-2, a gap of 0.5 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 1 mm; the position where the thin end of the inner core 3-3 matches the bottom tube 3-2, a gap of 0.1 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.2 mm; the position where the inner core 3-3 matches the tube 3-1, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm; the position where the sealing flange matches the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm. This can ensure the vacuum sealing of the tube and facilitate on-site assembly.

[0027] Example:

[0028] Figure 3 As shown, when the tube needs to be replaced, remove 3-6 (screws), remove 3-5 (sealing flange), remove 3-7 (sealing ring), take out 3-3 (original inner core), take out 3-1 (original tube), install 3-1 (new tube), insert 3-3 (inner core whose inner diameter matches the outer diameter of the new tube), install 3-7 (sealing ring whose outer diameter matches the new tube), confirm that 3-4 (sealing ring) is installed normally, install 3-5 (sealing flange), install 3-6 (screws), and complete the vacuum seal of the new tube.

[0029] exist Figure 2 In the conventional pipe-through structure, due to the need for vacuum sealing, the gap between 2-1 (pipe-through) and 2-2 (pipe-through bottom pipe) needs to be strictly controlled. Under general on-site conditions, 2-1 (pipe-through) usually needs to be passed from the inside to the outside, and the operating position and space are usually limited. Therefore, the actual installation is quite difficult. Once the matching sizes of 2-1 (pipe-through) and 2-2 (pipe-through bottom pipe) do not match, it will lead to a lot of rework and even scrapping of the pipe-through mother parts.

[0030] exist Figure 3In the embodiment, a universal tube-penetrating structure is used, and there can be a larger gap between 3-1 (tube-penetrating) and 3-2 (tube-penetrating bottom tube), so 3-1 (tube-penetrating) is easier to pass through from the inside to the outside. After 3-1 (tube-penetrating) passes through, 3-3 (inner core) is inserted from the outside. By designing the gaps between 3-1 (tube-penetrating), 3-3 (inner core) and 3-2 (tube-penetrating bottom tube), it is possible to achieve the requirements of convenient installation and disassembly and ensure sealed vacuum. Once the outer diameter of 3-1 (tube-penetrating) is inconsistent with the design or changes, the above problem can be solved by changing 3-3 (inner core).

[0031] exist Figure 3 The gap selection between 3-3 (inner core) and 3-2 (tube-through bottom tube) can refer to the following standards: the position where the thick end of 3-3 (inner core) matches with 3-2 (tube-through bottom tube), a gap of 0.5 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 1 mm; the position where the thin end of 3-3 (inner core) matches with 3-2 (tube-through bottom tube), a gap of 0.1 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.2 mm; the position where 3-3 (inner core) matches with 3-1 (tube-through), a gap of 0.15 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.3 mm; the position where 3-5 (sealing flange) matches with 3-1 (tube-through), a gap of 0.15 mm is reserved in the radial direction, that is, the diameter difference of the two parts at this position is 0.3 mm. This can not only ensure the vacuum sealing of 3-1 (tube-through), but also facilitate on-site assembly.

[0032] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A universal tube-penetrating vacuum sealing structure, comprising a tubular tube-penetrating, a tube-penetrating bottom tube surrounding the outer surface of the tubular tube-penetrating, the tube-penetrating bottom tube being provided with a thick end and a thin end, the thick end face being pressed against a sealing flange by screws, and further comprising a first sealing groove and a first sealing ring, and a second sealing groove and a second sealing ring, characterized in that: The inner diameter of the tube-penetrating bottom pipe is large enough: inner cores with different apertures can be inserted between the tube-penetrating bottom pipe and the tube-penetrating in a loose fit manner, and the inner cores with different apertures match the tube-penetrating pipes with different diameters, so as to meet the requirement of changing the diameter of the tube-penetrating without replacing the tube-penetrating bottom pipe; The gap between the inner core and the tube bottom tube is selected according to the following standards: at the position where the thick end of the inner core matches with the tube bottom tube, a gap of 0.5 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 1 mm; at the position where the thin end of the inner core matches with the tube bottom tube, a gap of 0.1 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.2 mm; at the position where the inner core matches with the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm; at the position where the sealing flange matches with the tube, a gap of 0.15 mm is reserved in the radial direction, that is, the diameters of the two parts at this position differ by 0.3 mm, which can ensure the vacuum sealing of the tube and facilitate on-site assembly; The inner core is also provided with a thick end and a thin end, and a step whose diameter and thickness match the diameter and thickness of the thick end of the inner core is provided on the end surface of the thick end of the tube bottom tube, and the thick end of the inner core is embedded in the step, and the step is used to ensure the compression and vacuum sealing between the thick end of the inner core and the flange end cover; A first sealing groove and a sealing ring are provided at the center of the thick end surface of the inner core around the periphery of the through-tube, and the sealing ring is used to block the air from entering the gap between the inner core and the through-tube and between the inner core and the flange end cover to ensure vacuum sealing; a second sealing groove and a sealing ring are provided circumferentially at the thick end surface of the through-tube bottom tube near the large radius of the screw, and the sealing groove and the sealing ring are used to block the air from entering the gap between the through-tube bottom tube and the flange end cover to ensure vacuum sealing.

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