RU214838U1 - Container with an absorber for gas purification of glove boxes with a U-shaped flow of the purified gas - Google Patents

Abstract

The solution relates to the field of glove boxes designed to work with materials in an environment of high purity inert gases (oxygen and moisture impurities less than 50 ppm). The tank with an absorber for cleaning the gas of glove boxes is made in the form of a tank with an absorber located inside, with inlet and outlet pipes of the gas to be purified, connected from the outside to the inside of the tank. The container is divided by a partition into two parts, and in the upper part the partition fits snugly against the walls of the container, and in the lower part there is an opening between the bottom and the partition. The technical result of the utility model is the uniform distribution of gas over the cross-sectional area of the container and the uniform flow of gas around the absorber located in the container. 1 w.p. f-ly, 19 ill.

Description

The solution relates to the field of glove boxes designed to work with materials in an environment of high purity inert gases (oxygen and moisture impurities less than 50 ppm).

Glove boxes are used to work with substances and products that can interact with water vapor, oxygen, and other gases contained in the air. For example, for work with lithium, chemical current sources. Glove boxes for working with such substances and products are filled with high purity inert gas, but contaminants released from materials, penetrating through gloves, and also entering the box in other ways worsen the purity of the gas in the box. To ensure high purity, gas purification systems are used, the principle of which, as a rule, consists in pumping the purified gas through a tank with absorbers.

The supply and removal of the gas to be purified to such tanks is usually carried out in the upper part of the tank.

Known designs of containers with absorbers are divided into two types:

1. The gas to be purified through a vertical tube enters the lower part of the vessel with the absorber and enters the space filled with the absorber.

2. The gas to be purified through a vertical tube enters the lower part, under the space in which the absorber is located. The absorber lies on a perforated intermediate bottom. Further, the gas through the perforation in the intermediate one enters the space filled with the absorber.

Similar solutions are used in glove boxes (see http://proflab.com.ua/produkt/category/340-perchatochnye-boksy.html , http://www.spectrosystems.ru/laboratory/boxes_single.shtml , https:/ /vilitek.ru/products/perchatochnye-boksy-i-aksessuary/perchatochnye-boksy-s-sistemoy-gazoochistki-serii-vbox-pro/).

The closest analogue is the glove box patent (RU105853U, published: 06/27/2011), including the main body of the box, a viewing window located on the main body of the box, glove clips installed on the viewing window, gloves installed on the glove clip, side panels attached to the main body of the box, and the antechamber mounted on the side panel, the main body of the box, side panels, glove clips, gloves and the antechamber have contact surfaces for contact with the seal rings, at least on one of the five intermediate surfaces, namely between the main between the main body of the box and the viewing window, between the main body of the box and the side panel, between the viewing window and the glove box, between the side panel and the prechamber, between the glove box and the glove, a leakage protection area is formed, characterized in that two through holes open into the area , which protects against leaks, while the two through holes are separated from each other another separator, in particular, one of the through holes is connected to a source of high purity gas, and the other serves as an opening to fill the area protecting against leaks with a flow of high purity gas.

The technical problems of the known solutions are as follows.

In tank designs where the gas to be purified enters the lower part of the tank with the absorber through a vertical tube and enters the space filled with the absorber, the gas leaves the tube through the tube without being distributed evenly over the volume of the absorber. The absorber, located near the tank shell with the absorber in its lower part, is not flown around by the gas to be purified and does not fully participate in the reaction. Near the exit of the gas from the tube to the absorber, the flow cross section sharply decreases due to the blockage of the outlet section of the tube by absorber granules. To pump gas through such a container, it is necessary to additionally overcome this resistance.

In tank designs, where the gas to be purified through a vertical tube enters the lower part, under the space in which the absorber is located. The absorber lies on a perforated intermediate bottom. Further, the gas through the perforation in the intermediate one enters the space filled with the absorber. The absorber can block the holes in the perforated intermediate bottom of the tank, in which case additional resistance to gas flow is created.

The objective of the utility model is to eliminate these technical problems inherent in the known solutions.

The technical result of the utility model is the uniform distribution of gas over the cross-sectional area of the container and the uniform flow of gas around the absorber located in the container.

The specified technical result is achieved due to the fact that a container with an absorber for gas purification of glove boxes is claimed, made in the form of a container with an absorber located inside, with inlet and outlet pipes of the gas to be purified, connected from the outside to the inside of the container, characterized in that the container is divided by a partition into two parts , and in the upper part the partition fits snugly against the walls of the container, and in the lower part there is an opening between the bottom and the partition.

It is possible that the hole is made in the form of a slot.

It is also possible that the hole is made in the form of several holes of the same or different shapes.

Brief description of the drawings

Figure 1 shows the change in pressure of the regeneration gas during the regeneration of the absorber using the regeneration gas, characterizing the standard method of regenerating the absorber by blowing regeneration gas through the absorber.

Figure 2 and figure 3 shows graphs characterizing the claimed cyclic vacuum-compression method of regeneration of the absorber with different speeds of pumping, gas puffing and exposure time of the absorber under vacuum and in the environment of regeneration gas.

Figure 4 shows the implementation of the claimed method on the example of a block diagram of a gas purification system with one container with an absorber.

Figure 5 shows the implementation of the claimed method on the example of a block diagram of a gas purification system with two tanks with an absorber, as well as a heat exchanger for cooling the gas heated in the process of cyclic pumping by a gas blower.

Figure 6 (A-B) shows options for diagrams of how the gas cleaning system can be connected to a glove box or glove box system.

In Fig.7(A-E), Fig.8(A-E), Fig.9 shows diagrams that justify the reasons for a more complete regeneration of the absorber when using a cyclic vacuum-compression method of regeneration according to the claimed method.

Figure 10 shows an example of a gas purification device, which uses the claimed cyclic vacuum-compression method of absorber regeneration.

Figure 11 shows an example of the principle of the blower.

Figure 12 shows an example of a blower device with the location of the outlet gas outlet on the same wall of the housing where the blower nozzle is directed.

Figure 13 shows an example of a blower device with the location of the outgoing gas nozzle on the housing wall, opposite to that where the blower nozzle is directed.

14 shows an example of a blower device equipped with a cooling jacket.

Figure 15 shows examples of schematic devices of various designs of containers with an absorber.

On Fig shows an example of the design of the container with the absorber.

On Fig.17-19 shows examples of working working samples of various models of glove boxes, manufactured according to the claimed solution, during which the achievement of the claimed technical results was confirmed.

In the drawings: 1 - inlet of the gas to be purified, 2 - valve for the supply of gas to be purified, 3 - inlet of the regeneration gas, 4 - valve for the supply of regeneration gas, 5, 5.1, 5.2 - tank with an absorber, 6 - pump-out valve, 7 - vacuum pump, 8 , 8.1, 8.2 - gas outlet valve, 9 - blower, 10 - gas outlet, 11 - coolant inlet, 12 - heat exchanger, 13 - coolant outlet, 14 - gas purification system, 15, 17 - glove boxes, 16 - valve for supplying gas to be purified into a container with absorber 5.1, 18 - valve for supplying regeneration gas and pumping out a container with absorber 5.1, 19 - inert gas, 20 - valve for supplying gas to be purified into a container with absorber 5.2, 21 - valve for exiting gas to be purified from a container with absorber 5.2 absorber 5.2, 22 - valve for supplying regeneration gas and pumping out the container with absorber 5.2, 23 - regeneration gas, 24 - reaction products of the recoverable absorber and regeneration gas, 25 - regeneration gas supply valve, 26 - regeneration gas supply, 27 - space around the absorber body, 28 - absorber, 29 - pore in the absorber, 30 - thermal insulation of the tank with the absorber, 31, 33, 47 - heaters, 32 - gas supply pipeline from the gas blower to the tank with the absorber, 34, 37, 42 - filters, 35, 38 - valves of the pressure control system, 36 - fine-tuning throttle, 39 - check valve, 40 - evacuation valve of the vessel with an absorber, 41 - throttle for setting the regeneration gas flow, 43 - valve for evacuating the vessel, 44 - pressure sensor, 45 - safety valve, 46 - temperature sensor, 48 - low pressure area, inert gas, 49 - atmospheric pressure area, air, 50 - high pressure area, inert gas, 51 - blower suction pipe, 52 - blower discharge pipe, 53 - sealed housing, 54 - nozzle axis of the blower discharge pipe, 55 - outlet gas pipe of the airtight blower housing, 56 - hole in the blower housing, 57 - gas flow directions inside the blower housing, 58 - air care, 59 - outlet flange for installation of the exhaust gas pipe 55, 60 - inner wall of the hermetic gas blower housing with a water jacket, 61 - outer wall of the hermetic gas blower housing with a water jacket, 62 - coolant supply pipe, 63 - damper supports, 64 - branch pipe coolant drain, 65 - seal of the sealed housing cover, 66 - screws for fastening the sealed housing cover, 67 - gas discharge pipe of the pressure control system, 68 - sealed power supply, 69 - gas supply pipe of the pressure control system, 70 - gas blower sealed housing cover, 71 - a tube through which the gas to be purified enters the lower part of the tank with an absorber, 72 - a partition separating two parts of the tank with an absorber, 73 - a low-velocity gas flow area, 74 - a high-velocity gas flow area, 75 - a perforated intermediate bottom , 76 - boundary of the gas flow area in the absorber, 77 - temperature sensor sleeve, 78 - tube pressure sensor connection, 79 - safety valve connection tube.

Implementation of the utility model

The claimed container with an absorber for cleaning the gas of glove boxes with a U-shaped flow of the purified gas is made in the form of a container with an absorber located inside. From the outside, inside the container, the inlet and outlet pipes of the gas to be purified are connected.

What is new is that the container is divided by a partition into two parts, and in the upper part the partition fits snugly against the walls of the container, and in the lower part there is an opening between the bottom and the partition.

It is possible that the hole is made in the form of a slot, but it can be of any other shape. For example, several holes of the same or different shapes can be made.

Due to the presence of a partition in the claimed design, in comparison with known solutions, the gas is evenly distributed over the cross-sectional area of the tank and evenly flows around the absorber located in the tank.

In addition, unlike the known solutions, where the absorber can block the holes in the perforated intermediate bottom of the container, and in this case additional resistance to gas flow is created, the claimed design is free from this drawback, since the absorber lies on the bottom of the container with the absorber.

Comparison of the principle of operation of known technical solutions and the claimed design can be seen in the diagrams of Fig.15.

From Fig.15(A) shows an example of a container with an absorber, in which the gas to be purified through a vertical tube 71 enters the lower part of the container 5 with an absorber and enters the space filled with absorber 28.

From Fig.15(B) shows an example of a container with an absorber of the proposed design, divided by a partition 72 into two parts.

From Fig.15(B) shows an example of a container 5 with an absorber, in which the gas to be purified through a vertical tube 71 enters the lower part of the container with an absorber and enters the space filled with absorber 28. It can be seen that the boundary 76 of the gas flow area in the absorber is uneven in a container.

From Fig.15(D) shows an example of a container 5 with an absorber, in which the gas to be purified through a vertical tube 71 enters the lower part, under the space in which the absorber 28 is located. The absorber 28 lies on the perforated intermediate bottom 75. Further, the gas through the perforation in the intermediate bottom 75 enters the space filled with absorber 28.

From Fig.15(D) shows an example of the tank 5 with the absorber of the proposed design, in which the gas flow area is divided by a partition 72 into two parts.

From Fig.15(E) shows an example of a container 5 with an absorber, from which the gas flow rate in the absorber is clearly visible, and where the gas to be purified through a vertical tube 71 enters the lower part of the container with an absorber and enters the space filled with absorber 28.

From Fig.15(G) shows an example of a container 5 with an absorber, from which the gas flow rate in the absorber is clearly visible for a container with an absorber of the proposed design, divided by a partition 72 into two parts.

From the comparison of Fig.15(E and G) it can be seen that in the variant of Fig.15(E) there is a region of gas flow with a high speed 74, which is absent in the variant of Fig.15(G) of the proposed design.

Thus, the claimed utility model is characterized by the fact that the container inside has a U-shaped flow of the purified gas at a low speed, which in turn ensures uniform distribution of gas over the cross-sectional area of the container and its uniform flow around the absorber located in the container.

And, since in the claimed utility model the absorber does not block the holes in the perforated intermediate bottom of the container, no additional resistance to gas flow is created.

The container 5 with the absorber can be 300 mm in diameter. The container 5 is filled with an absorber 28 with a spherical shape of particles with a diameter of 3 mm.

The inner diameter of the tube 71 through which the gas to be purified passes to the lower part of the container with the absorber can be 40 mm. Low gas velocity is considered to be less than 4 m/s, high gas velocity - more than 4 m/s.

Diagrams for connecting the tank 5 with the absorber 28 to the gas purification system are shown in Fig.4 and Fig.5.

The capacity with the absorber can be made in the form of a device, an example of which is shown in Fig.16. Sleeves of heaters 47, 31 and 33 are installed inside the vessel body 5. On the vessel body there are also sleeves 77 for inserting temperature sensors and a regeneration gas supply pipe 18. The partition 72 is placed between the heaters 31.

In currently known glove box installations (see analogues), processing is carried out by passing hydrogen or a mixture of hydrogen and other gases (hydrogen solution in nitrogen, hydrogen solution in argon, hydrogen solutions in other gases) through a container with an absorber.

With the standard regeneration method inherent in known solutions, the pores of the absorber contain a mixture of residues of an inert gas, regeneration gas, and reaction products.

The technical problem of such a process is the incomplete and slow recovery of the absorber, and with a large gas flow.

Another problem is that in order to control the regeneration process in a fully automatic mode with the classical regeneration method, it is necessary to use gas flow controllers, while gas flow measurement is usually more complicated and expensive than pressure measurement.

The proposed variation of the utility model provides for the elimination of these technical problems, a more complete and faster recovery of the absorber and with less gas consumption. In addition, the simplification of the process of automating the control of the regeneration process is provided.

The essence of the operation of the claimed utility model is a reflection of an example of its functioning on the principle of a cyclic vacuum-compression method of absorber regeneration in the glove box gas purification system, the rationale for which is given below.

As a standard, the absorber is generated by purging a regeneration gas (a mixture of inert gas and hydrogen).

In this method - first, the container with the absorber is pumped out by a vacuum pump, then it is filled with gas, and so on alternately.

Due to the evacuation, the regeneration gas penetrates into the absorber better, the reaction products are carried away, and the absorber is more completely reduced, faster and with less gas consumption. In the process of evacuation, inert gas and reaction products are removed from the pores of the absorber, with the subsequent supply of regeneration gas, these pores are filled with regeneration gas. Thus, the regeneration gas enters the layers of the absorber, into which, under the standard regeneration scheme, it practically does not penetrate or penetrates much more slowly, since there are inert gas molecules.

The difference of this method of regeneration is that in the process of regeneration, the container with the absorber is periodically evacuated. Thus, the absorber is not constantly in the gas flow, but alternately in the environment of the regeneration gas and vacuum.

This improvement provides a more complete regeneration of the absorber due to a deeper penetration of the regeneration gas into the absorber. In the process of evacuation, inert gas and reaction products are removed from the pores of the absorber, with the subsequent supply of regeneration gas, these pores are filled with regeneration gas. Thus, the regeneration gas enters the layers of the absorber, into which, under the standard regeneration scheme, it practically does not penetrate or penetrates much more slowly, since there are inert gas molecules. As a result, after regeneration by this method, the same amount of scavenger is able to bind more oxygen compared to when the traditional method is used.

It also reduces the consumption of regeneration gas.

The automation of the process is also simplified. To control the regeneration process in a fully automatic mode with the classical method of regeneration, it is required to use gas flow regulators, in the proposed version, pressure sensors and valves. Gas flow measurement is more complicated and expensive than pressure measurement.

The regeneration process described in the example is a cyclic alternation of stages:

supply of regeneration gas to a tank with an absorber,

exposure of the absorber in the environment of regeneration gas,

evacuation of a container with an absorber,

exposure of the absorber at reduced pressure,

moreover, the regeneration process can begin and end at any of the stages, but if the cycle is completed at the stage of evacuation or exposure of the absorber at reduced pressure, then after connecting the container with the absorber to the volume being cleaned, the container with the absorber is filled with gas, from the volume being cleaned - a glove box or a system of boxes , and if the cycle ends at the stage of supplying regeneration gas or holding the absorber in the environment of the regeneration gas, then the generation gas, which was in the tank with the absorber, is mixed with the gas to be purified.

The graphs of figure 1 show the change in the pressure of the regeneration gas in the process of regeneration of the absorber using the regeneration gas. The graph of figure 1 characterizes the standard method of regenerating the absorber by blowing regeneration gas through the absorber.

Graphs of figure 2 and figure 3 characterize the claimed cyclic vacuum-compression method of regeneration of the absorber with different speeds of pumping, gas puffing and exposure time of the absorber under vacuum and in the environment of regeneration gas.

Figure 4 shows the implementation of the claimed method on the example of a gas purification system with one container with an absorber.

The purified gas from the glove box enters the gas purification system through the corresponding flange 1 and valve 2 and enters the container 5 with an absorber, which removes moisture and oxygen impurities, then valve 8, blower 9 and outlet flange 10 enter the system (glove box). In the cleaning mode, the supply valves 2 and the outlet of the purified gas 8 are open, and the valves for the regeneration gas supply 4 and pumping out 6 are closed. In the regeneration mode, the supply valves 2 and the outlet of the purified gas 8 are closed, and the valves for the supply of regeneration gas 4 and pumping out 6 are controlled in such a way that conditions are cyclically created in the tank with the absorber to ensure the stages of regeneration:

supply of regeneration gas to a tank with an absorber,

exposure of the absorber in the environment of regeneration gas,

evacuation of a container with an absorber,

exposure of the absorber at reduced pressure.

As a rule, in the process of regeneration using the method of cyclic vacuum-compression regeneration, at least 100 cycles pass, including the 4 stages described above.

A tank with an absorber can be connected to the gas purification system in different ways, as well as several tanks with an absorber can be included in the gas purification system.

The diagram of Fig.5 shows a diagram of a gas purification system with two tanks 5.1, 5.2 with an absorber, as well as a heat exchanger 12 for cooling the gas heated in the process of cyclic pumping by a gas blower 9.

The scheme of Fig.5 differs from the scheme of Fig.4 in that it has two containers 5.1, 5.2 with an absorber and it is possible to carry out regeneration in one of the containers, while the other container is used for gas purification. Also in the circuit there is a heat exchanger 12 for cooling the circulating gas.

For the heat exchanger, an inlet 11 and an outlet 13 of the coolant are used.

In contrast to the scheme of figure 4 in figure 5, valves 16 and 20 are used to supply the gas to be purified into containers with absorbers 5.1 and 5.2, respectively, from the blower 9.

In addition, regeneration valves 18 and 22 are used with absorbers 5.1 and 5.2, respectively. In this case, valves 8.1, 8.2 are used to exit the gas to be purified from the tank with absorbers 5.1, 5.2, respectively.

The supply of regeneration gas 26 is controlled through valve 25.

Cyclic vacuum-compression method of regeneration of the absorber using regeneration gas can be one of the stages of preparation (regeneration) of the absorber. For example, a solution is often found in which oxygen and moisture absorbers (usually molecular sieves) are located in the same container with the absorber. The full regeneration cycle of the backfill in this case can combine the vacuum-compression method of regeneration of the oxygen absorber and drying in vacuum or without evacuation of the moisture absorber. That is, before or after the oxygen absorber is regenerated by the cyclic vacuum-compression method, the container is kept with or without pumping out with or without heating to regenerate the moisture absorber or to dry the absorbers.

Other similar systems, in addition to those shown in Fig.4 or Fig.5, can be created by this method of absorber regeneration.

All such gas cleaning systems can be connected to the glove box or glove box system in various ways, for example, the options presented (A, B, C) in Fig.6.

An inert gas circulates between the gas purification system 14 and the glove box 15 (options of Fig.6(A, B)) or glove boxes 15 and 17 (Fig.6(C)). The gas cleaning system absorbs oxygen and moisture impurities that enter the box 14 with materials through leaks diffusing through gloves and seals.

The reasons for a more complete regeneration of the absorber when using a cyclic vacuum-compression method of regeneration according to the claimed method are clearly justified by the following diagrams in Fig.7, Fig.8, Fig.9.

Schemes A-E in Fig.7 illustrate the standard method of regeneration of the oxygen absorber with the purge of the absorber with regeneration gas, inherent in the known technical solutions. Known methods reflect the following regeneration processes.

Scheme A in Fig.7 - the stage before the start of the regeneration process. The container with the absorber is filled with inert gas 19 or air.

Scheme B in Fig.7 - regeneration gas 23 is supplied to the tank with the absorber 28, which gradually displaces the inert gas 19 or air from the space 27 around the absorber.

Scheme B in Fig.7 - regeneration gas 23 begins to gradually penetrate into the pores 29 of the absorber 28.

Scheme D in Fig.7 - on the surface of the absorber 28 and in the pores 29 are formed products 24 of the reaction of the regeneration gas and the absorber.

Schemes D, E in Fig.7 - the absorber 28 is in the regeneration gas flow, in the pores 29 and on the surface of the absorber there are regeneration gas 23, remnants of inert gas 19 or air, reaction products 24.

Schemes A-E in Fig.8 illustrate a cyclic vacuum-compression method for regenerating an oxygen absorber:

Scheme A in Fig.8 - the stage before the start of the regeneration process. The container with absorber 28 is filled with inert gas 19 or air.

Scheme B in Fig.8 - the tank with the absorber is pumped out by a vacuum pump, the inert gas 19 or air is pumped out of the space volume 27 around the absorber of the tank with the absorber 28 and the pores 29 of the absorber.

Scheme B in Fig.8 - the container is filled with regeneration gas 23, which deeply fills the pores 29 of the absorber 28.

Scheme D in Fig.8 - on the surface of the absorber 28 and in the pores 29 are formed products 24 of the reaction of the regeneration gas and the absorber.

Scheme D in Fig.8 - the container with the absorber 28 is pumped out by a vacuum pump, the regeneration gas 23 and the reaction products 24 are pumped out of the volume of the container with the absorber and the pores 29 of the absorber.

Scheme E in Fig.8 - capacity with the absorber 28 is filled with regeneration gas 23, which deeply fills the pores 29 of the absorber.

Further, the processes shown in diagrams A-E of Fig. 8 are repeated cyclically.

From Fig.7-9 it can be seen that with the standard method of regeneration according to Fig.7 (A-E) in the pores of the absorber there is a mixture of residues of inert gas 19, regeneration gas 23, reaction products 24. In the proposed method (Fig.8(A- E)) inert gas 19 and reaction products 24 are removed at the stage of evacuation of the container with absorber 28.

As a result, the absorber 28 is exposed to a higher concentration of regeneration gas 23 and the area of interaction is higher due to deeper penetration into the pores 29. This results in a more complete recovery of the absorber, faster and with less gas consumption.

The utility model can be implemented on the example of the gas purification device shown in Fig. 10, which uses the claimed cyclic vacuum-compression method for absorber regeneration.

In such a device, gas purification occurs due to the absorption of oxygen and moisture impurities by the absorber located in the container 5 with the absorber, the gas circulation between the container with the absorber and the glove box is carried out by pumping the gas with a gas blower 9, which is located in a sealed housing.

Tank 5 with absorber is equipped with thermal insulation 30.

The valves for supply 16 and outlet 21 of the purified gas cut off the container 5 with the absorber during its regeneration. Regeneration is carried out by heating the absorber with heaters 31, 33, 47, pumping out the tank through the corresponding valve 43 and inlet regeneration gas through the regeneration gas supply valve 4.

During the regeneration process, the temperature in the vessel with the absorber is measured by temperature sensor 46, and the pressure by pressure sensor 44.

A safety valve 45 is provided to prevent an emergency increase in pressure.

To prevent the ingress of gas from the gas blower through the pressure control valve 38 into the container 5 with the absorber during its pumping out, a check valve 39 is provided.

During cleaning, the pressure in the box and the gas purification system is maintained by the operation of the valves of the pressure control system 35, 38. liquid is supplied through the inlet 11 and outlet 13 tubes.

Filters 37, 42 are used to filter the gas supplied and pumped out.

To adjust the pressure control system, fine-tuning chokes 36, 41 are used.

It should be noted that the specified cyclic vacuum-compression method of regeneration of the absorber using regeneration gas is optimal for the operation of the claimed design of the container with the absorber.

An example of the functional operation of this method is described below, using an internally cooled glove box blower.

Glove boxes are used to work with substances and products that can interact with water vapor, oxygen, and other gases contained in the air. For example, for work with lithium, chemical current sources. Glove boxes for working with such substances and products are filled with high purity inert gas, but contaminants released from materials, penetrating through gloves, and also entering the box in other ways worsen the purity of the gas in the box. To ensure high purity, gas purification systems are used, the principle of which, as a rule, consists in pumping the purified gas through a tank with absorbers. Blowers (blowers, compressors, fans) are used to move gas between tanks with absorbers and the volume of the box. Since the concentration of impurities in the box is extremely low (usually less than 50 ppm), the gas circulation device must have high tightness.

Due to the fact that such devices (see analogues), as a rule, have elements of rotation, the seals of the rotating shaft are potential sources of leakage (penetration of impurities into the purified gas). In well-known systems (see analogues), three types of solutions are used:

A. Standard blowers with mechanical shaft seal. This design allows leakage and cannot be considered structurally tight. Typically used for applications with low gas purity requirements.

B. Devices for pumping gas with the transmission of torque through a sealed magnetic coupling.

C. Devices for pumping gas, which by themselves do not provide sufficient structural tightness, but are placed in a sealed housing, and the suction and discharge pipes are removed from the volume of the sealed housing.

Standard blowers with a mechanical shaft seal (A) are leak-proof and cannot be considered structurally tight. Gas leakage (penetration of oxygen and water vapor into the purified gas) occurs along the shaft seals through the lip seal. In this place, the inert gas leaks into the atmosphere and the penetration of oxygen and moisture from the atmosphere into the inert gas.

Blowers for gas pumping (B) with torque transmission through a sealed magnetic coupling are significantly more expensive than standard blowers. Installing a standard gas blower in a sealed housing is a more profitable and economical solution.

Devices for pumping gas (C) by themselves do not provide sufficient structural tightness, therefore they are placed in a sealed housing, and their suction and discharge pipes are removed from the volume of the sealed housing.

In this case, it is difficult to cool the blower motor, since there is no access to ambient air. And, if there are micro-leaks in the sealed housing, nothing prevents the penetration of oxygen and moisture into the housing and subsequent penetration through the blower shaft seals into the inert gas.

The following example of using a glove box blower eliminates these shortcomings of type C blowers and reduces the likelihood of microimpurities penetrating into the volume of a sealed housing from the outside. In addition, compared to type C, the cooling of the motor and blower housing is significantly improved.

The outlet pipe of the blower is not led out of the sealed housing, but inside. Thus, the gas from the blower exits into the internal volume of the blower, washes it, and then goes further into the system through a branch pipe connecting the internal cavity of the sealed housing with the external system.

The advantages of this solution is to reduce the likelihood of penetration of microimpurities into the volume of the sealed housing from the outer space, since when using this design, an increased relative to atmospheric pressure is provided in the housing.

As a rule, the sealed housing of the blower has collapsible connections, which are necessary for placing the blower in it, such connections are potential places for the penetration of microimpurities into the volume of the sealed housing and further into the glove box. The creation of excess pressure in the internal volume of the hermetic housing due to the release of gas into the internal volume of the hermetic housing by a blower reduces the likelihood of penetration of microimpurities. The gas flow through possible leaks will move from the housing to the external environment due to the pressure difference between the internal and external spaces of the housing.

The principle of operation of the gas blower is shown in Fig.11, where an area with atmospheric pressure is visible, air 49, inert gas enters through the suction pipe 51 (see Fig.12). At the same time, an area of high pressure, an inert gas 50, is formed inside the housing 53 of the blower 58 (see Fig. 11).

An area of high pressure, an inert gas 50 is present inside the body 53 of the blower 58, and the discharge pipe 52 of the blower with its axis 54 of the nozzle is directed to the inner wall of the body 53, so that gases circulate inside the body in different directions 57 until they exit through the pipe 55 of the outgoing gas installed in the hole 56 of the housing 53 of the blower 58 with an offset to the axis 54.

Thus, in comparison with the version of devices for pumping gas type C, the cooling of the engine and blower housing is significantly improved, since they are constantly in the environment of the moving gas 57, the gas washes the blower 58 and its engine, thus cooling them.

There are other options for placing the outlet 55 of the outgoing gas and the opening 56 of the housing in the housing 53 of the blower 58, for example, as shown in Fig.13. That is, the nozzle 55 and the hole 56 may even be located coaxially with the axis 54 (although there is an offset in Fig. 13), but on the opposite wall of the housing 53. The result of circulating gases inside the housing 53 will be similar to that in Fig. 12, when on the body 53 of the same wall, where the nozzle is directed, an opening 56 is made, into which a branch pipe 55 for the outgoing gas is installed.

Other ways of installing the hole 56 on the housing 53, in which the branch pipe 55 for the outgoing gas is installed, are also acceptable, for example, on adjacent (adjacent) walls, so long as it is not coaxial with the axis 54 and is not located on the same wall of the housing 53, where it is directed nozzle.

The blower 58 may be a vortex, centrifugal, or axial blower. The choice of type does not affect the technical result.

For better cooling of the system, the hermetic housing 53 of the gas blower can be equipped with a cooling jacket to cool the gas circulating in the system (see Fig.14). The blower jacket in such a device is formed by two walls - inner 60 and outer 61. Coolant is supplied to the cavity between them through pipe 62, coolant exits through the coolant outlet pipe. Before long-term storage or transportation of the unit, the coolant is drained through the drain pipe 64. The top cover 70 of the hermetic blower housing is connected to the end walls through the seal 65 and is pressed with fastening screws 66. On the cover 70 there is a pipe 67 for pumping gas from the pressure control system, a sealed power supply 68 and a gas supply pipe 69 of the pressure control system. On the outlet flange 59, also located on the top cover, the outlet gas pipe 55 is placed. To prevent the blower 9 from creating vibration, damper supports 63 are installed between its base and the lower base of the sealed housing.

Figures 17-19 show examples of glove boxes made according to the claimed solution, during which the achievement of the claimed technical results was confirmed.

Claims (2)

1. A container with an absorber for cleaning the gas of glove boxes, made in the form of a container with an absorber located inside, with inlet and outlet pipes of the gas to be purified connected from the outside to the inside of the container, characterized in that the container is divided by a partition into two parts, and in the upper part the partition fits snugly to the walls of the container, and at the bottom there is a hole between the bottom and the partition. 2. The container according to claim 1, characterized in that the hole is made in the form of a slot.

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