SU1469214A1 - Forevacuum criogenic trap - Google Patents

Abstract

The invention relates to vacuum technology and can be used in fore vacuum pumping systems. The purpose of the invention is to increase the protective properties of the trap and reduce operating costs. The vertical case with a removable lid 2 is provided with inlet and outlet pipes (P) 3 and 4. The vessel 5 with cryogenic liquid is placed in the case 1 and fixed on the lid 2. The outer screen 7 of gas-permeable high-temperature conductive material is mounted on the vessel 5 with formation of the inlet cavity 6 The bellows 8 with a flange 9 is connected to the P 4. The internal gas-permeable heat-conducting screen is made in the form of a tank 10 oriented upside down and placed with the formation of an intermediate cavity 11 with the inner walls 12 of the vessel 5. You are 5 filled in the form of an annular cup 13; Through windows 15 are made in the walls of the glass 1 3, communicating cavities 6 and 11. Case 1 is equipped with a lower removable cover 16, P 4 and bellows 8 with flange 9 are installed. Flange 9 is in contact with screen 10. P 3 is placed in the middle of the height of the screen 7. Screen 7 is made of alternating gas-permeable and continuous high heat-conducting sections in contact with the glass 13. 1 Cp. f-ly, 2 ill. 2 S cl .7

Description

The invention relates to vacuum technology and can be used in fore-vacuum pumping systems.

The purpose of the invention is to increase the protective properties of the trap and reduce operating costs.

Figure 1 shows a trap, a longitudinal section 5 in figure 2 - section AA in FIG. 1.

The forevacuum cryogenic trap contains a vertical housing 1 with a removable top krippka 2, equipped with an inlet pipe 3 and an outlet pipe 4, placed in the housing 1 and fixed on 2 vessel 5 with cryogenic liquid, mounted on the vessel 5 with the formation of the input cavity 6 external screen 7 of gas permeable a highly heat-conducting material., and a bellows 8 with a flange 9, connected to the outlet nozzle 4 o. The Lyoushka additionally contains an internal gas-permeable high-heat conducting screen made in the form of an oriented By needing upward a container 10 forming the intermediate cavity 11 with the inner walls 12 of the vessel 5. The vessel 5 is designed as an annular glass 13 and fixed on the glass 13 with a removable heat-conducting connection 14 in the lower part. Through windows 15 are made in the walls of the cup 13, which communicate the entrance 6 and intermediate 11 cavities. The housing 1 is provided with a lower removable Kr-type MB on which the outlet nozzle 4 and the bellows 8 with the flange 9 are in contact with the inner screen 10, and the inlet nozzle 3 is placed in the middle of the height of the outer screen 7.

In addition, the inner screen can be made of alternating gas-permeable 17 and solid 18 highly heat-conducting portions in contact with the annular cup 13. The outer screen 7 is fixed on the cup 13 by means of ribs 19, and the flange 9 contacts the tank 10 through a seal 20 .

The trap works as follows.

Through the inlet 3 into the space between the housing 1 and the external screen enters the pumped gas. Gas can enter the intermediate cavity 6 only through the screen 7. The passage through the cooled porous structure of the highly heat-conducting material of the screen 7, the evacuated gas contacts the cooled surfaces, as a result of which water vapor is effectively frozen out. The remaining uncondensed water vapor is frozen on the walls of the annular cup 13 and on the inner screen, which improves the protective properties of the trap.

The external screen 7 is cooled with the aid of heat-conducting fins 19 mounted on the glass 13. To ensure uniform freezing of water vapor on the entire surface of the screen 7, the inlet 3 is placed in the middle of the height of the external screen 7. As a result, the gas flows evenly into the cavity 6 through the entire porous surface of the screen 7. From the cavity 6, the gas through the through-holes 15 enters the cavity 11 and is discharged through the porous container 10, the bellows 8 and the outlet 4 to the external pumping means (not shown). Migrating from the pumping means and moving towards the pumped gas are frozen out on the cooled surface of the porous high thermal conductivity material of the inner screen. To effectively freeze these vapors, the structure of the tank 10 is sufficiently less dense and gas permeable compared to the structure of the outer screen 7. This prevents the pores of the tank 10 from overlapping with the condensation vapor of the working fluid and ensures unhindered passage of the pumped gas. Uniform cooling of the container 10 is provided by removing heat from it to the glass 13. Seal 20, flange 9 and bellows 8 separate cavities 6 and 11 from the inner space of the fishing chamber, the lugs communicated with the inlet 3. The bellows 8 ensures compression of the seal 20 to the container. , When cleaning the trap, remove the cover 16 and the bellows 8 with a flange 9, then remove the condensate removal tank 10 of the working fluid vapor, and after removing the upper cover 2 remove the water condensate from the external screen 7,

The use of the proposed trap makes it possible to increase the reliability of its operation in a wide range of pressure and to improve its properties.

operational

Claims (2)

1. A forevacuum cryogenic trap containing a vertical case with a removable upper arm, equipped with inlet and outlet nozzles, JQ placed in the body and attached to the crest of a vessel with cryogenic liquid, mounted on the vessel with the formation of the entrance cavity, the outer screen of the gas-permeable high-15 temperature a wired material, and a flanged bellows, connected to the outlet nozzle, characterized in that 47-0, in order to increase the protective properties of the trap 20 and to reduce operating costs, the additional trap but contains an internal gas-permeable high-heat conducting screen, made in the form of an upward-facing container, placed with the formation of an intermediate cavity with the inner walls of the vessel, made in the form of an annular cup, and fixed on the last detachable heat-conducting connection in the lower part, in the walls of the glass through windows communicating the inlet and intermediate cavities; the housing is provided with a lower removable cap, on which the outlet and bellows are mounted with a flange in contact with the inner morning screen, and the inlet is located in the middle of the height of the external screen. 2. A trap according to claim 1, characterized in that the internal screen is made of gas-permeable and continuous highly heat-conducting sections alternating with each other and contacting with the annular cup. Editor L.Pcholinsk Compiled by E. Zabugin Tehred M. Didyk Proofreader M. Vasiliev Order 1339/40 Circulation 520 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 /five Fzg 2 Subscription