阅读说明：本技术 一种应用于加速器真空系统的刀口密封型快卸法兰组件 (Knife edge sealing type quick-release flange assembly applied to accelerator vacuum system ) 是由 闫逸花 张化一 蒋罗荣 王忠明 王敏文 吕伟 王迪 王茂成 刘卧龙 杨业 陈伟 于 2020-04-09 设计创作，主要内容包括：本发明提供了一种应用于加速器真空系统的刀口密封型快卸法兰组件。该法兰组件包括一对刀口法兰盘、一个铜圈以及两条链条卡箍；一对刀口法兰盘背对背贴合设置,其密封面仍参照国家标准刀口法兰制作,铜圈作为密封圈使用,一对刀口法兰盘外部采用两条链条卡箍首尾螺栓连接进行固定和密封,拆卸安装时,仅需操作两个连接螺栓即可完成,极大地缩短了拆装时间,大大减少了操作人员被辐射时间,此外,密封圈依然选择铜圈,相较现有技术降低了密封圈的加工难度和维护成本,进一步地降低了加速器的运行成本。(The invention provides a knife edge sealing type quick-release flange assembly applied to an accelerator vacuum system. The flange assembly comprises a pair of knife edge flange plates, a copper ring and two chain hoops; the back-to-back laminating of a pair of edge of a knife ring flange sets up, its sealed face still refers to the preparation of national standard edge of a knife flange, the copper ring uses as the sealing washer, a pair of edge of a knife ring flange outside adopts two chain clamp head and the tail bolted connection to fix and seal, when dismantling the installation, only need operate two connecting bolt and can accomplish, the dismouting time has greatly been shortened, operating personnel has significantly reduced by the radiation time, in addition, the copper ring is still selected to the sealing washer, compare prior art and reduced the processing degree of difficulty and the maintenance cost of sealing washer, the running cost of accelerator has further been reduced.)

1. The utility model provides a be applied to accelerator vacuum system's edge of a knife canned type quick-release flange subassembly which characterized in that: comprises a pair of knife edge flanges (1), a copper ring (2) and two chain hoops (3);

each knife edge flange plate (1) comprises a first-stage cylindrical section (11), a second conical transition section (12) and a third-stage cylindrical section (13), and the diameter of the first-stage cylindrical section (11) is larger than that of the third-stage cylindrical section (13);

the first-stage cylindrical sections (11) of the pair of knife edge flanges (1) are attached, knife edges (14) are arranged on the attaching surfaces of the two first-stage cylindrical sections (11), and a copper ring (2) is arranged between the two knife edges (14); the two second conical transition sections (12) in the pair of knife edge flanges (1) and the outer circular surface of the first-stage cylindrical section (11) in the pair of knife edge flanges (1) form a protrusion (15) with a trapezoidal section;

the chain clamp (3) comprises a plurality of chain blocks (31), chain plates (32) and chain shafts (33); every two adjacent chain blocks (31) are hinged through a chain plate (32) and a chain shaft (33);

chain blocks (31) at two ends of the two chain hoops (3) are fixedly butted in a bolt connection mode, so that a flexible circular ring is formed;

each chain block (31) is provided with a notch with a trapezoidal section, the trapezoidal notches of all the chain blocks (31) form a clamping groove (34), and the clamping grooves (34) are matched with the protrusions (15).

2. The knife-sealed quick release flange assembly for an accelerator vacuum system of claim 1, wherein: the thickness range of the copper ring (2) is 2.25mm to 2.50 mm.

3. The knife-edge sealing type quick-release flange assembly applied to the accelerator vacuum system as claimed in claim 1 or 2, wherein the copper ring (2) is treated by placing the copper ring in a vacuum degree lower than 5 × 10^-4And (3) in a Pa high-temperature furnace, keeping the temperature for 1-2 hours after the furnace temperature is increased to 300 ℃ of 250-.

4. The knife-sealed quick release flange assembly for an accelerator vacuum system of claim 3, wherein: the structures of the two chain hoops (3) are completely consistent.

5. The knife-sealed quick release flange assembly for an accelerator vacuum system of claim 4, wherein: when the two chain hoops (3) are connected through the bolts, the locking torque required by the bolts on one side is 45 Nm-80 Nm.

6. The knife-sealed quick release flange assembly for an accelerator vacuum system of claim 5, wherein: the taper of the second conical transition section (12) is 20 degrees.

Technical Field

The invention relates to a flange, in particular to a knife edge sealing type quick-release flange assembly applied to an accelerator vacuum system.

Background

At present, a national standard knife edge flange is commonly used on the vacuum pipeline of the accelerator, dozens of bolts are used for locking and sealing, the used copper ring has lower processing cost, the connection of the interfaces of the common vacuum pipeline of the accelerator can be met, and the application technology is mature.

However, in the particle accelerator testing device, the external cavity of part of the beam measuring equipment is directly connected with the vacuum pipeline, the beam measuring equipment has limited radiation dose tolerance, and after the accumulated absorbed dose reaches a certain level, a higher failure rate exists, and workers can inevitably be influenced by the radiation dose when entering the field to disassemble and install the equipment. And the flange sealing bolt of ordinary edge of a knife is more, dismantles and installs consuming time for a long time, in order to effectively shorten dismouting operating time, reduces radiation dose and to staff's health injury, need change sealed mode, reduces the dismouting step, and quick-release flange is a fine solution.

However, the common small-size quick-release flange which is commonly used at present is sealed by a rubber ring, is not suitable for the sealing requirement of a large-size accelerator pipeline, and also does not meet the requirements of a high vacuum system of the accelerator on low gas release rate and high baking temperature resistance of a sealing material; the prior art applies a quick-release flange which uses an aluminum sealing ring with a diamond-shaped cross section as a sealing medium, has good sealing effect, but has the defects of high processing difficulty of the special-shaped aluminum sealing ring, high price and higher cost than a copper sealing ring used by a knife edge flange, and high disassembly and replacement cost.

Disclosure of Invention

In order to solve the problems of the existing quick-release flange in the background technology, the invention provides a knife edge sealing type quick-release flange assembly applied to an accelerator vacuum system, and the flange assembly still selects a copper ring as a sealing medium on the premise of meeting the quick-release requirement, so that the processing difficulty and the maintenance cost of a sealing ring are reduced, and the operation cost of an accelerator is reduced.

The specific technical scheme of the invention is as follows:

a knife edge sealing type quick-release flange component applied to an accelerator vacuum system comprises a pair of knife edge flange plates, a copper ring and two chain hoops;

each knife edge flange plate comprises a first-stage cylindrical section, a second conical transition section and a third-stage cylindrical section, and the diameter of the first-stage cylindrical section is larger than that of the third-stage cylindrical section;

the first-stage cylindrical sections of the pair of knife edge flange plates are attached, knife edges are arranged on the attaching surfaces of the two first-stage cylindrical sections, and a copper ring is arranged between the two knife edges; the two second conical transition sections in the pair of knife edge flanges and the outer circular surface of the first-stage cylindrical section in the pair of knife edge flanges form a protrusion with a trapezoidal section;

the chain clamp comprises a plurality of chain blocks, chain plates and chain shafts; every two adjacent chain blocks are hinged with each other through a chain plate and a chain shaft;

chain blocks at two ends of the two chain hoops are fixedly butted in a bolt connection mode, so that a flexible circular ring is formed;

each chain block is provided with a notch with a trapezoidal section, the trapezoidal notches of all the chain blocks form a clamping groove, and the clamping grooves are matched with the protrusions.

Further, the thickness of the copper ring ranges from 2.25mm to 2.50 mm.

Further, the copper ring is treated by placing the copper ring in a vacuum degree of less than 5 × 10^-4In a Pa high-temperature furnace, the furnace temperature is increased to 250-300 ℃, then the temperature is preserved for 1-2 hours, the temperature is stopped and the heating is closed after the temperature preservation is finished, the furnace is naturally cooled and continues to be cooledKeeping vacuumizing, closing the vacuum pump after the furnace temperature is reduced to be less than or equal to 80 ℃, filling nitrogen, opening the cavity door, and taking out the copper ring.

Further, the two chain hoops are completely identical in structure.

Further, when the two chain clamps are connected through the bolts, the required locking torque of the unilateral bolt is 45Nm to 80 Nm.

Further, the taper of the second conical transition section is 20 °.

The invention has the beneficial effects that:

1. the invention provides a quick-release flange assembly which comprises a pair of knife edge flanges, a copper ring and two chain hoops, wherein the inner sealing surface of the knife edge flange is still manufactured according to the national standard knife edge flange, the copper ring is used as a sealing ring, the two chain hoops are connected by bolts from head to tail to fix and seal the flange, and the disassembly and the assembly can be completed only by operating two connecting bolts, so that the disassembly and the assembly time are greatly shortened, the radiation time of operators is greatly reduced, in addition, the copper ring is still selected as the sealing ring, the processing difficulty and the maintenance cost of the sealing ring are reduced compared with the prior art, and the operation cost of an accelerator is further reduced.

2. The invention controls the thickness and the hardness of the copper ring, determines the copper ring treatment process, gives the thickness and the size of the copper ring, also gives the locking torque range of the two chain hoops, and realizes that the locking torque is not higher than 1E-12Pam³The vacuum leakage rate per second meets the requirements of a high vacuum system of the accelerator.

Drawings

Fig. 1 is a perspective view of a flange assembly.

Fig. 2 is a cross-sectional view of a flange assembly.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a cross-sectional view of the knife-edge flange.

Fig. 5 is a partially enlarged view of fig. 4.

The reference numbers are as follows:

1-a knife edge flange plate, 11-a first-stage cylindrical section, 12-a second conical transition section, 13-a third-stage cylindrical section, 14-a knife edge and 15-bulges;

2-copper ring;

3-chain clamp, 31-chain block, 32-chain plate, 33-chain shaft and 34-clamping groove.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the invention, it is noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides a specific implementation structure of a knife edge sealing type quick-release flange assembly applied to an accelerator vacuum system, which comprises a pair of knife edge flange plates 1, a copper ring 2 and two chain hoops 3, as shown in figures 1 and 2;

as shown in fig. 3 and 4, each knife-edge flange plate 1 comprises a first-stage cylindrical section 11, a second conical transition section 12 and a third-stage cylindrical section 13, wherein the diameter of the first-stage cylindrical section 11 is larger than that of the third-stage cylindrical section 13;

the first-stage cylindrical sections 11 of the pair of knife edge flange plates 1 are attached, knife edges 14 are arranged on the attaching surfaces of the two first-stage cylindrical sections 11, and a copper ring 2 is arranged between the two knife edges 14; the two second conical transition sections 12 in the pair of knife edge flanges 1 and the outer circular surfaces of the first-stage cylindrical sections 11 in the pair of knife edge flanges 1 form a protrusion 15 with a trapezoidal section; the chain clamp 3 comprises a plurality of chain blocks 31, chain plates 32 and chain shafts 33; every two adjacent chain blocks 31 are hinged through a chain plate 32 and a chain shaft 33; the chain blocks 31 at the two ends of the two chain hoops are fixedly butted in a bolt connection mode, so that a flexible circular ring is formed; every chain piece 31 is last all to be equipped with a cross-section and to be trapezoidal breach, and the trapezoidal breach of all chain pieces forms a draw-in groove 34, draw-in groove 34 with protruding 15 cooperatees, because draw-in groove 34 and protruding 15 cross-sections are trapezoidal, adopts the bolt to connect two chain clamps 3 and staple bolt on a pair of edge of a knife ring flange 1, and a pair of edge of a knife ring flange 1 all receives inward pressure this moment to it is tighter to make a pair of edge of a knife ring flange laminating, and sealed effect is better.

The number of the chain blocks 31 in the chain clamp 3 in the embodiment can be properly increased or decreased according to the diameter of the knife edge flange plate 1, so that the requirements of different calibers can be met, and the applicability is stronger.

The thickness of the copper ring in this embodiment is a range requirement: typically 2.25mm to 2.50 mm;

when the caliber of the flange assembly is DN150, the thickness of the copper ring is 2.25mm to 2.40 mm;

when the caliber of the flange assembly is DN200, the thickness of the copper ring is 2.35mm to 2.50 mm;

because the knife edge flange plate structure and the external fastening mode of the flange assembly are changed, and the hardness of the copper ring is required to be proper, the copper ring 2 adopts the following treatment process that the copper ring is placed in the vacuum degree of lower than 5 × 10^-4And (3) in a Pa high-temperature furnace, keeping the temperature for 1-2 hours after the furnace temperature is increased to 300 ℃ of 250-.

When two chain clamps 3 pass through bolted connection in this embodiment, also have certain requirement to the locking moment of bolt, two chain clamps 3 that this embodiment adopted are isometric and the structure unanimous, and the unilateral bolt locking moment through the test is optimal does:

when the caliber of the flange assembly is DN150, the locking moment T of the single-side bolt is more than or equal to 45Nm and less than or equal to 55 Nm;

when the caliber of the flange assembly is DN200, the single-side bolt locking torque T is more than or equal to 50Nm and less than or equal to 80 Nm.

This embodiment has still carried out the sealed effect test of flange subassembly and has tested, and the concrete process is:

on a certain 200MeV proton application device, 20 flange components with the diameter of DN150 and 4 flange component connection points with the diameter of DN200 are arranged in total, synchronous circular pipeline vacuum pump distribution is combined to carry out subsection one-by-subsection leak detection on the flange component connection points, a dry pump and a molecular pump of the connection point section are started, after the vacuum degree is reduced to be less than or equal to 5Pa, a leak detector is started, a helium needle head is utilized to firstly carry out spray detection on a pair of knife edge flange plate butt joint gaps in each connection point from top to bottom, and when the leak rate is higher than 1E-10Pam³When the pressure is in the second range, the two locking bolts are symmetrically screwed until the vacuum leakage rate of all the connecting points reaches less than or equal to 1E-12Pam³Requirement of/s.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.