SU1293443A1 - Siphon for filling cryostat - Google Patents

Abstract

The invention relates to a low-temperature technique and can be used to fill and refuel the liquefied gases of cryostats and cryogenic plants. The aim of the invention is to simplify the design and operation of the siphon. The siphon for filling the cryostat contains a heat-insulated pipeline with inlet and outlet nozzles, the by-pass means located between them, communicated through the opening with the upper part of the cryostat, is made-. leg with drainage line. The bypass means is made in the form of a narrowing or widening of the pipeline section located in front of the hole in the upper part of the cryostat, and the siphon dimensions are selected from the ratio S 8 () / S, where S is the opening area of the bypass means; S is the flow area of the cryostat drainage line; S / и are the cross-sectional areas of the inlet and outlet of the siphon, respectively; cross-sectional area of the cryostat. Due to the difference in the flow sections of the internal pipeline and the siphon outlet branch pipe implemented in the bypass means, the pressure in the outlet branch pipe decreases, and steam from the pipeline is evacuated through the hole, the upper part of the cryostat into the gas tank, thereby eliminating the thermo-acoustic effect and additional losses. cryofluids during refueling. 4 il. .S (L 1C CD 00 U OP

Description

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15

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The invention relates to a low-temperature technique and can be used to fill and refuel the liquefied gases of cryostats and cryo-installations.

The aim of the invention is to simplify the design and operation of the siphon.

Figure 1 shows the construction of a siphon installed in a cryostat; Fig. 2 shows the bypass means in the form of a narrowing of the pipeline; on fig.Z - that

in the form of a nozzle; figure 4 - the same

"

in the form of an expanding section of the pipeline.

Siphon consists of internal heat-insulated 1 and external 2 pipelines, cavity 3 between which is evacuated. The internal pipe 1 is connected to the outlet pipe 4 by means of the bypass means 5, which is connected with the upper part 6 of the cryostat 7 by the hole 8. The siphon is inserted by the outlet pipe into the cryostat so that the bypass means with the hole is between the level 9 of the cryogenic liquid 10 and the key 11 of the cryostat in which the drainage line 12 is located. The inlet 13 of the siphon is inserted into the filling vessel 14. If necessary, the siphon can be made either solid or collapsible. In the latter case, it consists of an outlet 15 and an inlet 16 parts, which are connected together by a seal 17. The outer pipeline is connected to the crystal and the vessel by seals 18

  . 40

The bypass means can be made in several versions: in the form of a narrowing section of the pipeline with a hole 8 in its lower part (Fig. 20; in the form of a nozzle 20 located in the nozzle (Fig. 3); in the form of an expanding section of the pipeline, while the pipeline 1 is included in the pipe 4 (figure 4).

The siphon dimensions are chosen from the ratio

l

thirty

50

s; s

s. (s:

sD / s.

S and cross-sectional area

with with

INPUT and outlet siphon nozzles respectively; S is the cross-sectional area of the cryostat.

Siphon works as follows.

Before refilling, the siphon is inserted into the cryostat by the outlet pipe, and the inlet pipe is inserted into the vessel and the system is sealed with seals. In this case, the opening 8 is located between the cryostat cover and the maximum possible level during the filling of the cryostat with the level of cryogenic liquid.

By creating pressure in the vessel, through a heat-insulated pipeline, the liquid is distilled into a cryostat. The pressure in the outlet pipe is almost atmospheric. However, when refilling the cryostat, it is necessary that the liquid does not enter its cavity through the opening 8, which would cause an increase in the amount of evaporating liquid when refilling the cryostat. For this purpose, pressure reduction in the outlet pipe is provided by means of by-pass means. In the general case, it is achieved by a difference in the flow sections of the internal pipeline and the outlet.

In the device of FIG. 2, the flow rate in the constriction increases, the pressure decreases, and the liquid practically does not flow into the cavity of the cryostat through the opening 8; In the device according to FIG. 3, an opening 8 is made of a Bbmie nozzle in a nozzle, where the cryogenic liquid when filling the cryostat is practically absent; in the device by. Fig. 4: The reduction in pressure at the outlet nozzle is due to the sudden expansion of flow areas.

After filling the cryostat, the pressure in the vessel is released.

The vapor from the internal siphon pipeline is evacuated through the opening 8, the upper part and the drain of the cryostat into the gas tank. Consequently, in the proposed construction there is no thermoacoustic effect, therefore there is no need for a siphon after

fill the cryostat or raise it where S is the opening area of the bypass so that the ends of the nozzles

there were levels of cryo-liquid in the crS- - the area of the flow area of the remaining vessel and the vessel, or, if the siphon

of the cryosplice drainage line, connect it to the drainage

tata;

to

15

0

five

0

s

0

0

S and cross-sectional area

with with

INPUT and outlet siphon nozzles respectively; S is the cross-sectional area of the cryostat.

Siphon works as follows.

Before refilling, the siphon is inserted into the cryostat by the outlet pipe, and the inlet pipe is inserted into the vessel and the system is sealed with seals. In this case, the opening 8 is located between the cryostat cover and the maximum possible level during the filling of the cryostat with the level of cryogenic liquid.

By creating pressure in the vessel, through a heat-insulated pipeline, the liquid is distilled into a cryostat. The pressure in the outlet pipe is almost atmospheric. However, when refilling the cryostat, it is necessary that the liquid does not enter its cavity through the opening 8, which would cause an increase in the amount of evaporating liquid when refilling the cryostat. For this purpose, pressure reduction in the outlet pipe is provided by means of by-pass means. In the general case, it is achieved by a difference in the flow sections of the internal pipeline and the outlet.

In the device of FIG. 2, the flow rate in the constriction increases, the pressure decreases, and the liquid practically does not flow into the cavity of the cryostat through the opening 8; In the device according to FIG. 3, an opening 8 is made of a Bbmie nozzle in a nozzle, where the cryogenic liquid when filling the cryostat is practically absent; in the device by. Fig. 4: The reduction in pressure at the outlet nozzle is due to the sudden expansion of flow areas.

After filling the cryostat, the pressure in the vessel is released.

The vapor from the internal siphon pipeline is evacuated through the opening 8, the upper part and the drain of the cryostat into the gas tank. Consequently, in the proposed construction there is no thermoacoustic effect, therefore there is no need for a siphon after

highway and gasholder.

To completely eliminate the thermoacoustic effect, it is necessary that the pressure in the cryostat be equal to the pressure in the internal pipeline. This is possible if the rate of outflow of gas from the cavity of the pipeline is equal to the rate of outflow of gas through the drain line.

With a selected ratio of the cross-sectional areas of the siphon, the cryogenic liquid evaporating in its cavity will have time to be evacuated through the opening 8, without creating excessive pressure and not causing a thermoacoustic effect.

If the opening of the bypass means is less than the chosen value (the right side of the inequality), then the pressure in the bellows cavity will increase, and due to the pressure differential relative to the cryostat, a thermoacoustic effect will occur, resulting in an additional loss of cryo-fluidity.

The upper limit of the orifice of the bypass means is limited by the bore area of the internal pipeline (inlet).

The proposed siphon is significantly simpler in terms of the design of known devices, since it lacks complex nodes and is also easier to use

di, because after filling the cryostat with liquid, virtually all operations for disconnecting the siphon or blocking its cavities are practically eliminated.

Claims (1)

Invention Formula A siphon for filling a cryostat containing a thermally insulated pipeline with an inlet and an outlet branch pipe, located between them bypass. The means communicated through the hole with the upper part of the cryostat, made with-With a drainage line, characterized in that, in order to simplify the design and operation, the bypass means is made in the form of a narrowing or widening section of the pipeline j s: 5 „s (S +) / S. Where S; H 5 „- the hole area of the bypass means; S is the flow area of the cryostat drainage line; -1 you e is the cross-sectional area of the inlet and outlet of the siphon, respectively; S is a cross section of a cryostat. give / eight Fue. 2 Compiled by A. Berlin Editor M. Tsitkina Tehred I. Popovich Corrector A. Zimokosov Order 367/39 Circulation 453 Subscription VNSHPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 97i / a. J ig. V