RU159660U1 - DEVICE FOR REFRIGERANT COOLING COOLER - Google Patents

Abstract

A device for supplying refrigerant to the cold chamber, containing a tube-shaped feeder, one end of which is equipped with an electric heater with a closing casing and placed in a Dewar vessel, characterized in that the device for supplying refrigerant to the cold chamber contains a funnel made integrally with the flange, and a sealing plug made with a vertical through hole located between the neck of the Dewar vessel and the seat in the flange, while the funnel tube located in the vertical hole of the plug 5 mm longer than the height of the cork, the upper cylindrical part of the funnel is made with an internal thread, and hermetically connected to the lower threaded part of a thin-walled heat-insulating tube, the upper part of which is equipped with a shaped flange with an internal thread, the lower part of which is hermetically connected to the upper threaded part of the feeder, and the upper threaded part of the shaped flange is connected to the lower threaded part of the outlet fitting, the upper threaded part of which is intended to be connected to the cold chamber pipeline, the upper threaded part of the feeder is made with a vertical cylindrical cavity in which a metal ball is located, which is a ball valve, and the end of the upper threaded part of the feeder is made with slotted slots, the end of the lower threaded part of the outlet fitting is also made with slotted slots, from the outer part the funnel is equipped with a tap made with the funnel as a whole, the internal threaded part of the outlet is hermetically connected to the safety valve, the device also contains two hooks located and handles suck

Description

The proposed solution relates to the field of cryogenic technology, in particular to devices for pumping and refueling liquid nitrogen, as well as for freezing vacuum traps.

Known "Device for overflow of liquid nitrogen from a Dewar vessel", patent for the invention of the Russian Federation No. 2359167, published on 06/20/2009. Bull. No. 17 selected as an analogue. The device is equipped with a plug with an opening into which the filling tube is hermetically inserted. The cork tightly closes the neck of the Dewar vessel. One end of the filling tube is equipped with a heat exchanger-evaporator and placed in a Dewar vessel, the free end of the tube is lowered into the refueling tank.

The disadvantage of this device is the inability to regulate the supply of nitrogen during operation.

The closest analogue to the claimed technical solution chosen as a prototype is “Device for supplying refrigerant to the cold chamber”, USSR author's certificate No. 350216 published on 09/04/1972. Bull. No. 26. The device contains a feeder in the form of a tube, in the lower part of which there is an outside heater closed by a casing. At the place where the tube exits the neck of the Dewar vessel, a sealing device is located. The end of the tube outside the vessel has a union nut for connection to the fitting of the working chamber (cold chamber).

The disadvantages of this device are:

- low heater power (20 watts);

- the possibility of depressurization of the sealing device of the neck of the Dewar vessel (departure of the sealing device from the neck) when creating a pressure of 1-1.5 atmosphere in it, which is necessary for quick freezing, for example, vacuum (purge) nitrogen traps.

- it is not possible to connect at least one more device with a dewar vessel to the cold chamber pipeline for the purpose of their consistent use.

The task of this technical solution is to create a device for supplying refrigerant to the cold chamber with reliable sealing of the neck of the Dewar vessel and providing the possibility of connecting at least one other device with the Dewar vessel to the pipeline of the cold chamber for the purpose of their consistent use.

The solution to the technical problem in the device for supplying refrigerant to the cold chamber, containing a tube-shaped feeder, one end of which is equipped with an electric heater with a closing casing and placed in the Dewar vessel, is achieved by the fact that the device for supplying refrigerant to the cold chamber contains a funnel made as a whole with a flange, and a sealing plug made with a vertical through hole located between the neck of the Dewar vessel and the seat in the flange, while the funnel tube is located in the vertical the cork hole is 5 mm longer than the cork height, the upper cylindrical part of the funnel is made with an internal thread and sealed to the lower threaded part of a thin-walled heat-dissipating tube, the upper part of which is equipped with a shaped flange with an internal thread, the lower part of which is hermetically connected to the upper threaded part of the feeder, and the upper threaded part of the shaped flange is connected to the lower threaded part of the outlet fitting, the upper threaded part of which is intended to be connected to cold chamber, the upper threaded part of the feeder is made with a vertical cylindrical cavity in which a metal ball is located, which is a ball valve, and the end of the upper threaded part of the feeder is made with slotted slots, the end of the lower threaded part of the outlet fitting is also made with slotted slots, with the outer parts, the funnel is equipped with an outlet made with the funnel as a whole, the internal threaded part of the outlet is hermetically connected to the safety valve, the device also contains two hooks disposed on the handles Dewar vessel provided with a threaded connection lambs connected with two rods made in the form of rods, the upper part of which is formed integrally with forks articulated joints with the flange which is formed with mating portions thereof disposed on opposite sides.

In FIG. 1, as an example of a practical implementation, two devices are shown for supplying refrigerant to a cold chamber with two Dewar vessels (the Dewar vessel is shown in section in the right). In FIG. 2 - view A, in FIG. 3 is a view B, in FIG. 4 is a view C of a device for supplying refrigerant to the cold chamber of FIG. 1 in section.

A device for supplying refrigerant to a cold chamber contains, a tube 1 feeder 1, one end of which is equipped with an electric heater 2 with a closing casing 3 and is placed in a Dewar vessel 4, characterized in that the device for supplying refrigerant to a cold chamber contains a funnel 5 made as one integral with the flange 6, and a sealing plug 7, made with a vertical through hole, located between the neck of the Dewar vessel 4 and the seat in the flange 6, while the funnel tube 5 located in the vertical hole the barrel 7 is 5 mm longer than the height of the tube 7, the upper cylindrical part of the funnel 5 is made with an internal thread and is tightly connected to the lower threaded part of a thin-walled heat-releasing tube 8, the upper part of which is equipped with a shaped flange with an internal thread, the lower part of which is hermetically connected to the upper threaded part of the feeder 1, and the upper threaded part of the shaped flange is connected to the lower threaded part of the outlet fitting 9, the upper threaded part of which is intended for connection to the pipeline cold chamber 10, the upper threaded part of the feeder 1 is made with a vertical cylindrical cavity in which a metal ball 11 is located, which is a ball valve, and the end face of the upper threaded part of the feeder 1 is made with slotted slots, the end of the lower threaded part of the outlet fitting 9 is also made with slotted slots, from the outer part, the funnel 5 is equipped with an outlet 12, made with the funnel 5 as a whole, the internal threaded part of the outlet 12 is hermetically connected to the safety valve 13, the device also contains two hooks 14 located on the handles 15 of the Dewar vessel 4, equipped with flaps 16 connected by a threaded connection to two rods 17, made in the form of rods, the upper part of which is integral with the forks 18 of the swivel joints with a flange 6, which is made with the mating parts of these connections located on opposite sides.

For clarity, Figs. 1, 4 show (conditionally) liquid nitrogen 19 with a special hatching and line 20 shows the level of liquid nitrogen 19 in the Dewar vessel 4 (Fig. 1). In FIG. 1, 2 shows the union nut 21 of the pipeline 10 of the cold chamber and the tee 22 (Fig. 1).

The safety valve device 13 includes: a rod 23 (Fig. 1, 2), a sleeve with a seat 24 (Fig. 2), a valve 25, a spring 26, a housing 27, an opening 28 in the housing 27, a clamping screw 29.

In FIG. 2 shows current leads 30.

Fig 3 shows; sleeve with collet 31; snap rings 32; casing tube 33.

The casing 3 and the sleeve with a collet 31 are made of fluoroplastic and with the same collet. When assembling the collet are fixed on the feeder 1 by the force of the spring rings 32 and additionally putting on the tube tube 33.

If necessary, the device can be made with a second outlet for connecting a pressure gauge (not shown).

As a heater 2, you can use a halogen bulb JC (cap G4), 12 V, power 20, 35 or 50 watts.

A device for supplying refrigerant to the cold chamber as follows.

When electric current is passed through heater 2 (Fig. 1), liquid nitrogen 19 evaporates and pressure is created on the surface of liquid nitrogen 19 in the Dewar vessel 4. The minimum pressure (determined by the weight of ball 11) is sufficient to open the ball valve 11. Under the pressure of a nitrogen stream, the ball 11 liquid nitrogen 19 also rises, flowing around it and passing through the slotted slots made at the end of the lower threaded part of the outlet nozzle 9, the passage hole in the nozzle 9 and the pipeline 10 enters the cold chamber. When using an adjustable electric power source of the heater 2, which has increased power (≥20 W.), it is possible to reduce the time the device reaches the operating mode by applying to the heater 2 for a while (until the initial pressure is reached), the maximum power of the heater 2. pressure is selected experimentally and may be close to maximum. The maximum pressure determined by the stiffness of the spring 26 (Fig. 2) of the safety valve 13. After a quick freezing of the cold chamber during operation, the electric power is reduced, guided by the temperature in the cold chamber or by defrosting the output manifold (for example, a vacuum nitrogen trap). In order to avoid excessive nitrogen flow 19 (Fig. 1), excess pressure is released through the safety valve 13, lifting the valve 25 (Fig. 2) up, manually pulling the upper end of the stem 23. By reaching the critical pressure determined by the stiffness of the spring 26, the safety valve 13 is triggered automatically. After the liquid nitrogen 19 (Fig. 1) ends in a working Dewar vessel 4, which will be noticeable by defrosting ice on the pipe 10, the heater 2 of the backup Dewar vessel 4 is connected to the electric power source. Using a second device for supplying refrigerant connected to the cold chamber with the backup Dewar vessel 4 allows you to increase the operating time of the cold chamber at least twice. When using more devices with Dewar vessels 4 for supplying refrigerant to the cold chamber, the pipe 10 must be equipped with an appropriate number of tees 22. The presence of a ball valve 11 in the device for supplying refrigerant to the cold chamber prevents the liquid nitrogen 19 from overflowing from the working Dewar 4 vessel through the pipeline 10, in the empty.

Thus, in comparison with the prototype, the proposed device for supplying refrigerant to the cold chamber provides the following technical result:

It is possible to install a heater with a power of ≥20 W;

solved the technical problem of reliable sealing of the neck of the Dewar vessel while creating a pressure in it of 1-1.5 atmosphere;

it is possible to connect at least one more device with a dewar vessel to the cold chamber pipeline for the purpose of their consistent use.

Claims (1)

A device for supplying refrigerant to the cold chamber, containing a tube-shaped feeder, one end of which is equipped with an electric heater with a closing casing and placed in a Dewar vessel, characterized in that the device for supplying refrigerant to the cold chamber contains a funnel made integrally with the flange, and a sealing plug made with a vertical through hole located between the neck of the Dewar vessel and the seat in the flange, while the funnel tube located in the vertical hole of the plug 5 mm longer than the height of the cork, the upper cylindrical part of the funnel is made with an internal thread, and hermetically connected to the lower threaded part of a thin-walled heat-insulating tube, the upper part of which is equipped with a shaped flange with an internal thread, the lower part of which is hermetically connected to the upper threaded part of the feeder, and the upper threaded part of the shaped flange is connected to the lower threaded part of the outlet fitting, the upper threaded part of which is intended to be connected to the cold chamber pipeline, the upper threaded part of the feeder is made with a vertical cylindrical cavity in which a metal ball is located, which is a ball valve, and the end of the upper threaded part of the feeder is made with slotted slots, the end of the lower threaded part of the outlet fitting is also made with slotted slots, from the outer part the funnel is equipped with a tap made with the funnel as a whole, the internal threaded part of the outlet is hermetically connected to the safety valve, the device also contains two hooks located and handles Dewar provided with threaded connection lambs connected with two rods made in the form of rods, the upper part of which is formed integrally with forks articulated joints with the flange which is formed with mating portions thereof disposed on opposite sides.

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