CN2270153Y

CN2270153Y - Liquid helium delivering Dewar pipe with heat exchanger

Info

Publication number: CN2270153Y
Application number: CN 96223550
Authority: CN
Inventors: 李洪强
Original assignee: Institute of Plasma Physics of CAS
Current assignee: Institute of Plasma Physics of CAS
Priority date: 1996-08-27
Filing date: 1996-08-27
Publication date: 1997-12-10
Anticipated expiration: 2006-08-27

Abstract

The utility model relates to a liquid helium delivering pipe in a canning container for gas phase liquid, gas and liquid two phases liquid or liquid phase liquid. The utility model has the main structure that a root of backflow tube (4) is sheathed out of an internal tube (3), the outside of the backflow tube (4) is also sheathed with an external tube (11), and a heat exchanger (7) is additionally arranged in the external tube (11) and on a pipeline between the internal tube (3) and the backflow tube (4). The utility model has the advantages of compact and simple structure, light weight, reliable performance and convenient use. When in actual use, the throttling efficiency reaches more than 40%, the infusion efficiency is not lower than 90%, and the utility model is suitable for transferring other any cryogenic liquid.

Description

The liquid helium transmission Dewar pipe of band heat exchanger

The utility model relates to the fluid tank of gas phase, gas-liquid two-phase or liquid phase and goes into the interior transport tube of container.

After liquid helium creates, all deposit in the big main storage tank so that transportation, wait transport to the destination after, divide again to install in the little storage Dewar, use with convenient.When packing, generally use indusion tube, one connects main storage tank, and one connects little storage Dewar, and at present general indusion tube structure mainly is made up of interior pipe and outer tube as shown in Figure 2, is pumped into high vacuum in its outer tube.Its infusion process is as follows: the helium flow in the main storage tank (1) (can be liquid phase, gas-liquid two-phase or gas phase) enters interior pipe (3) through valve (2), controls its flow by throttle valve (9), injects little storage Dewar (14) through valve (13) again.Helium flow meeting influenced by ambient temperature in use absorbs heat on every side and heats up, though be pumped into high vacuum in the outer tube, certain insulation effect is arranged, but still can not prevent that helium flow from gasifying in a large number when packing, this part helium, in the pipeline of valve (13) below, flow in the gas holder (6) by valve (5), be recovered.This indusion tube, shortcoming are that throttle efficiency is low, and generally between 10～20%, the loss of liquid helium is big, gasification many, very uneconomical.

The purpose of this utility model is, designs a kind of novel indusion tube, overcomes above-mentioned defective, makes its throttle efficiency height, and the liquid helium loss is little, reduces cost, increases economic efficiency.

In order to achieve the above object, the design proposal that the utility model is taked is at interior pipe (a 3) reflow pipe of overcoat (4), reflow pipe (4) is outer to overlap outer tube (11) again, in outer tube (11), adds a heat exchanger (7) on the pipeline of interior pipe (3) and reflow pipe (4), like this, the liquid helium transmission Dewar pipe of band heat exchanger of the present utility model, the throttle efficiency in its actual use reaches more than 40%, and transfusion efficient is not less than 90%, thereby reduced the loss of liquid helium, improved economic benefit.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Accompanying drawing 1 is a structural drawing of the present utility model;

Accompanying drawing 2 is structural drawing of existing general indusion tube.

As shown in Figure 1, the left end of interior pipe (3) connects main storage tank valve (2), the salable main storage tank (1) that is connected in, it is sealed at both ends on the external diameter of interior pipe (3) to be with reflow pipe (4) outside the interior pipe (3), there is return-air breeches pipe (15) reflow pipe (4) appropriate location, valve (5) is housed, valve (5) links to each other with gas holder (6), there is adiabatic breeches pipe (16) reflow pipe (4) appropriate location, valve (12) is housed on it, throttle valve (9) is equipped with in the appropriate location of reflow pipe (4), outside reflow pipe (4), be with sealed at both ends outer tube (11) on reflow pipe (4) external diameter again, between the outer wall of outer tube (11) and the reflow pipe (4), be pumped into high vacuum, the pipeline enclosure of outer tube (11) and reflow pipe (4), some supports (8) are housed, outer tube (11) is gone up the appropriate location and is had take out mouthful (10) that vacuumize usefulness, on the pipeline of interior pipe (3) and reflow pipe (4) heat exchanger (7) is housed, the outer surface of reflow pipe (4) is surrounded by radiation-resistant multilayer insulant, the right-hand member of interior pipe (3) connects little storage Dewar valve (13), the salable little storage Dewar (14) that is connected in, adiabatic breeches pipe (16) is connected with little storage Dewar (14), on adiabatic breeches pipe (16) pipeline valve (12) is housed.

Using process of the present utility model is: at main storage tank (1) with after storing Dewar (14) and all connecting with interior pipe (3), open main storage tank valve (2) and little storage Dewar valve (13) helium flow enters interior pipe (3), when heat exchanger (7), because the helium flow that main storage tank (1) comes and return-air helium flow have fully reduced the fluid temperature (F.T.) of managing in throttling is preceding in (3) after the heat exchange to the full extent heat exchanger (7) in, thereby improved throttle efficiency, again through throttle valve (9), throttle valve (9) can be adjusted a desirable flow, make the helium flow in the interior pipe (3) on throttle valve (9) left side can keep a desirable pressure, deposited in the little storage Dewar (14) through the helium flow after the throttling, the gas helium that produces will be got back in the reflow pipe (4) through valve (12) and adiabatic breeches pipe (16) by little storage Dewar valve (13) the adiabatic breeches pipe in below (16), with the opposite return-air helium flow inflow heat exchanger (7) that becomes of flow direction of liquid helium, deliver to gas holder (6) through valve (5) again; Because reflow pipe (4) outer surface has the radiation-resistant thermoinsulation material of multilayer, add the high vacuum in the outer tube (11), as suitable adjustment valve (12,5), can make the helium gas flow in the reflow pipe (4) moderate, when that is to say the helium flow outflow heat exchanger (7) that has guaranteed in the interior pipe (3), (7) return-air helium flow has minimum temperature difference in the inflow heat exchanger, thereby obtains minimum throttle temperature.Therefore, transfusion rate of the present utility model is not less than 90%, and the gasification of liquid helium is not more than 10%, has kept high economic benefit.

The utility model compact structure, simple, reliable performance, in light weight, easy to use, be beneficial to popularization, the structure type of heat exchanger can change flexibly, and it not only is used for liquid helium, also applicable to the transmission of other any cryogenic liquide, as: liquid hydrogen, liquid nitrogen, liquid argon etc.

Description of drawings: 1, main storage bin; 2, main storage bin valve; 3, inner tube; 4, return duct; 5, Valve; 6, gas holder; 7, heat exchanger; 8, support; 9, choke valve; 10, bleeding point; 11, outer Pipe; 12, valve; 13, little storage Dewar valve; 14, little storage Dewar; 15, return-air breeches pipe; 16, Adiabatic breeches pipe.

Claims

1. the liquid helium with heat exchanger transmits the Dewar pipe, mainly be by interior pipe (3), reflow pipe (4), outer tube compositions such as (11), it is characterized in that: the left end of interior pipe (3) connects main storage tank valve (2), the salable main storage tank (1) that is connected in, the outer reflow pipe (4) that is with of interior pipe (3), it is sealed at both ends on the external diameter of interior pipe (3), there is return-air breeches pipe (15) that valve (5) is housed on the reflow pipe (4), valve (5) links to each other with gas holder (6), reflow pipe (4) appropriate location has adiabatic breeches pipe (16) that valve (12) is housed, throttle valve (9) is housed on the reflow pipe (4), outside reflow pipe (4), be with sealed at both ends outer tube (11) on reflow pipe (4) external diameter again, be pumped into high vacuum between the outer wall of outer tube (11) and the reflow pipe (4), the pipeline enclosure of outer tube (11) and reflow pipe (4), some supports (8) are housed, outer tube (11) is gone up the appropriate location and is had the bleeding point (10) that vacuumizes usefulness, in outer tube (11) in the pipeline, on the pipeline of interior pipe (3) and reflow pipe (4) heat exchanger (7) is housed, the outer surface of reflow pipe (4) is surrounded by radiation-resistant multilayer insulant, interior pipe (3) right-hand member connects little storage Dewar valve (13), the salable little storage Dewar (14) that is connected in, adiabatic breeches pipe (16) is connected with (14) little storage Dewars (14), on adiabatic breeches pipe (16) pipeline valve (12) is housed.