RU207777U1 - Device for connecting a vacuum gas discharge device with a copper stem to a vacuum post - Google Patents

Abstract

The utility model relates to the field of vacuum technology, in particular to connecting devices for elements of vacuum systems. The required technical result, which consists in increasing the reliability of use, is achieved in a device that includes a double-sided flange with a sealing tooth for pressing it into the end face of the copper stem, as well as a Belleville spring to compensate for plastic deformation in the copper stem during prolonged degassing of the gas discharge device at elevated temperatures, at In this case, the sealing tooth for pressing it into the end face of the copper rod with an internal angle of 54 degrees is made of a symmetrical triangular shape with a radius of rounding of the apex equal to 0.1 mm. 2 ill.

Description

The utility model relates to the field of vacuum technology, in particular to connecting devices for elements of vacuum systems.

The connection of the gas-discharge device to the vacuum post is usually carried out directly through the pumping copper rod, and the removal of the device from the post after performing the necessary technological operations is carried out by biting the rod using cold welding mechanisms with manual or mechanical drive [FG Zakirov, EA Nikolaev. , Vacuum cleaner - vacuum cleaner. Textbook for vocational schools. M. "Higher School", 1977, p. 94].

Known device for connecting a vacuum device [Larin M.P. Flange seals for ultra-high vacuum systems used in the temperature range of 1.5 - 600 ° K., "Vacuum Engineering and Technology", v. 22, No. 2, 2012, pp. 113-118), containing vacuum flanges from DN10 to Du700, pumping rod welded to the first flange, copper gasket 2.5 mm thick, placed between the first and second flanges, having trapezoidal sealing teeth 1 mm high with a flat sealing surface width of about 0.5 mm, and the second flange is welded to vacuum post.

The disadvantage of this technical solution is the relatively low quality of the connection, since the sealing surface of the tooth presses into the volume of the gasket not only copper, but also the thin surface layer of oxides covering it, through which gas molecules from the atmosphere can flow into the pumped out system, reducing the quality of sealing.

Therefore, in such a flange connection for vacuum sealing, tightening bolts are used to create sufficiently large forces to press the sealing tooth into the copper gasket. This complicates the device.

In addition, after high-temperature exposure, the joint can lose its tightness due to plastic deformation of the gasket, which causes a relatively low reliability of the known device.

The closest in technical essence to the proposed one is a device for connecting a vacuum gas discharge device with a copper stem to a vacuum post [RU 203211, U1, H05N 1/00, 03/25/2021], including a vacuum connector with a flange seal using a metal vacuum gasket and a trapezoidal sealing tooth forms, in this case, a thickened end part of the stem is used as a counter flange in the vacuum connector, and a Belleville spring is introduced into the flange seal, providing a constant force of pressing the sealing tooth into the end part of the stem during degassing of the device for 40 hours at a temperature of 200 ° C ...

The closest technical solution has a relatively low reliability, since in order to secure the connection and ensure the required quality of the seal for this purpose, the operators are forced to apply large forces to the torque wrench when tightening the tightening nut. In particular, from the experimental test results given in the description of the prototype, it follows that the maximum compression of the Belleville spring by 0.9 mm was achieved with the torque wrench readings of 15 N * m, and the vacuum sealing of the connection device was achieved with the torque wrench readings of 30 N * m. In this case, the depth of indentation of the trapezoidal sealing tooth into the end face of the copper plug after the end of the thermal vacuum treatment of the device at the station at a temperature of 200 ° C was 0.2 mm.

The problem, which is solved in the utility model, is to create a device with increased reliability of the vacuum seal while reducing the force applied by the operator to the torque wrench when he tightens the sealing nut of the said connection device.

The required technical result consists in increasing the reliability of the vacuum seal of the connection device while reducing the force applied by the operator to the torque wrench when tightening the sealing nut of the said connection device.

The posed task of increasing the reliability of the device while reducing the physical stress on the operator is solved, and the required technical result is achieved by the fact that, in the device for connecting a vacuum gas-discharge device with a copper stem to a vacuum post, containing a double-sided flange with a sealing tooth for pressing it into the end face of the copper stem , as well as a Belleville spring to compensate for plastic deformation in a copper stem during prolonged outgassing of a gas discharge device at an elevated temperature, according to the utility model, a sealing tooth for pressing it into the end face of a copper stem with an internal angle of 54 ° is symmetrical triangular with a radius of apex rounding, equal to 0.1 mm.

The essence of the proposed device is illustrated by the drawings shown in FIG. 1 and FIG. 2.

FIG. 1 shows a device for connecting a vacuum gas discharge device with a copper rod to a vacuum post, which shows the features of connecting a vacuum gas discharge device through a copper rod to the pumping system of the vacuum post.

FIG. 2 shows a double-sided sealing flange.

The drawing indicates:

1 - gas-discharge device;

2 - copper stem;

3 - thickened end part of the copper rod;

4 - double-sided sealing flange;

5 - support flange;

6 - fork-shaped insert;

7 - inlet flange;

8 - sealing nut;

9 - disc spring;

10 - washer;

11 - insert;

12 - pipeline;

13 - outlet flange;

14 - evacuation system of the vacuum station;

15 - rack;

16 - vacuum post;

17 - the area of biting the metal rod.

FIG. 1 shows a device for connecting a vacuum gas discharge device with a copper rod to a vacuum post with a vacuum gas discharge device, which shows the features of connecting a vacuum gas discharge device through a copper rod to the pumping system of the vacuum post, and shows the vacuum gas discharge device 1 itself, the vacuum cavity of which is pumped out through a copper rod 2 ending with a thickened end part 3 of a copper rod inserted into the inlet flange 7 of the vacuum connector, which is represented by a set of parts 4-13. The double-sided sealing flange 4 on one side has a sealing tooth for pressing it into the end face of the copper rod, and this tooth with an internal angle of 54 ° is symmetric triangular with a radius of rounding of the apex equal to 0.1 mm. On the other hand, flange 4 has a sealing tooth for a standard groove-wedge seal through a copper gasket 0.5 mm thick with a support flange 5. Pipeline 12 with flanges 5 and 13 welded to it by argon-arc welding is designed to connect the vacuum connector with the pumping out vacuum system 14 of the post 16. Insert 6 is inserted through one of the side holes of the through-flange 7 to transmit the sealing force to the thickened end of the pumped-out copper rod. Insert 11 has two lateral fixing springs. The washer 10 is designed to transfer the sealing force to the insert 6 and insert 11. The sealing nut 8 is designed to create the required pressure on the thickened end part 3 of the copper rod when it is screwed onto the through-flange 7 using a torque wrench. The nut 8 has an internal groove with a depth of 1.4 mm to accommodate a Belleville spring 9 with a height of 2.3 mm. The Belleville spring 9 is designed to create the required sealing pressure on the thickened end part 3 of the copper stem after the sealing nut 8 comes into contact with the washer 10, as well as to maintain the sealing conditions during the long process of degassing the gas discharge device 1 at the post at a temperature of (280-300) ° WITH.

FIG. 2 shows a drawing of a double-sided sealing flange 4. The double-sided sealing flange 4 on one side (see fragment A) has a sealing tooth for pressing it into the end face of a copper rod, and this tooth with an internal angle of 54 ° is symmetrical triangular with a radius of rounding of the apex, equal to 0.1 mm.

On the other hand (see fragment B), the double-sided sealing flange 4 has a sealing tooth of a standard section for a vacuum groove-wedge seal through a copper gasket 0.5 mm thick with a support flange 5.

A device is used for connecting a vacuum gas-discharge device with a copper stem to a vacuum post as follows. Gas discharge device 1 is connected to the pumping system of the vacuum station 14 by introducing its copper stem 2 inside the inlet flange 7 until it touches the sealing tooth of the double-sided sealing flange 4. Insert 10 is inserted through one of the side holes of the inlet flange 7 to transfer the sealing force to the thickened end part 3 copper rod 2. Next, the sealing nut 8, together with the Belleville spring 9 and the ring 10, is screwed onto the inlet flange 7 and with the help of a torque wrench the pressing of the sealing tooth of the double-sided flange 4 into the flat end of the thickened end part 3 of the copper rod 2 is achieved with the help of a torque wrench. that the sealing tooth for pressing it into the end face of the copper pumping rod with an internal angle of 54 ° is symmetrical triangular with a radius of curvature of the apex equal to 0.1 mm, pressing such a sealing tooth into the end face of the copper pumping rod leads to the fact that surface shtengel oxide The teeth are forced out in all directions from the sealing tooth, which improves the quality of the vacuum seal. In addition, a radius of curvature greater than 0.1 mm does not allow for a reliable seal when using only the elastic potential of the Belleville spring, and with a smaller radius, damage to the top of the sealing tooth may occur.

After that, the vacuum cavity of the gas discharge device 1 is pumped out by the vacuum system of the post 14 through the copper rod 2, the double-sided sealing flange 4, the support flange 5, the pipeline 12 and the outlet flange 13. After the completion of the necessary technological processes at the vacuum post, the gas discharge device 1 is filled with a working gas mixture and is carried out biting the copper rod 2 in area 17 using a hydraulically driven cold welding mechanism and removing the device 1 from the post.

The performance of the presented device is confirmed by the tests carried out, from which it follows that when screwing the sealing nut 8 with a torque wrench onto the inlet flange 7, the nut 8 of the washer 10 touches the nut 8 (with the maximum compression of the Belleville spring 9 by 0.9 mm), the moment corresponds to 15 N * m, and this point was matched by the achievement of reliable sealing of the connection device. Subsequent heating of the presented device at a vacuum post 16 at a temperature of 300 ° C for 40 hours did not reveal a depressurization of the device.

At the same time, the depth of indentation of a triangular sealing tooth with an angle of 54 ° at its apex, which has a radius of curvature of 0.1 mm, into the flat end of the copper rod 2 after the end of the device warming up at the post at a temperature of 300 ° C for 40 hours turned out to be about 0.25 mm. This means that the Belleville spring, previously compressed by 0.9 mm, retains a significant part of its elastic potential even after the described high-temperature heating and successfully fulfills its functional purpose.

Thus, thanks to the introduced improvements in the device, the required technical result of increasing its reliability is achieved while reducing the physical stress on the operator.

Claims (1)

A device for connecting a vacuum gas discharge device with a copper rod to a vacuum post, including a double-sided flange with a sealing tooth for pressing it into the end face of the copper rod, as well as a Belleville spring to compensate for plastic deformation in the copper rod during prolonged degassing of the gas discharge device at elevated temperatures, characterized by that the sealing tooth for pressing it into the end face of the copper rod with an internal angle of 54 ° is symmetrical triangular with a radius of rounding of the apex equal to 0.1 mm.

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