Spaceflight high-efficiency composite air purification device and assembling process thereof

Abstract

The application discloses a high-efficiency composite air purification device for aerospace and an assembling process thereof. The device comprises an outer cylinder body and three coaxially arranged net cylinders. One end of the outer cylinder body is provided with an outlet end cover, and the other end of the outer cylinder body is provided with an inlet end cover. An air inlet is arranged on the inlet end cover. A plurality of round holes are formed in the three net cylinders, and the outermost net cylinder is arranged in the outer cylinder body. The air inlet is communicated with the innermost net cylinder through the inlet end cover. A lithium hydroxide layer is filled in a cavity formed between the middle net cylinder and the outermost net cylinder. An active carbon and carbon monoxide catalyst mixed layer is filled in a cavity formed between the innermost net cylinder and the middle net cylinder. The purification technologies of carbon dioxide, carbon monoxide and volatile organic gases are combined, so that the device has high purification efficiency, low flow resistance and high outlet cleanliness. After the device is subjected to the severe mechanical environment test of aerospace launching, the device still has high purification performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air purification devices for aerospace, in particular to a high-efficiency composite air purification device for aerospace and an assembling process thereof. BACKGROUND

[0002] When people stay in a closed space, about 1 kg / d of carbon dioxide and some trace harmful gases such as carbon monoxide and volatile organic gases acetone, ethanol, etc. are produced by human metabolism. Other equipment and materials in the closed space also produce a variety of trace harmful gases by outgassing and volatilization. The accumulation of these gases in the air to a certain amount will affect the health and work efficiency of the personnel. Therefore, carbon dioxide and trace harmful gases must be purified.

[0003] In a closed space, short-term stay or in an emergency, air purification is required. Short-term usually uses consumable technology. Carbon dioxide removal generally uses soda lime, lithium hydroxide, etc. to remove by chemical absorption; trace harmful gases usually use activated carbon to remove by physical adsorption, and some gases such as carbon monoxide use catalytic oxidation to remove.

[0004] Air purification devices are often used in places such as mines, petrochemicals, and ships to purify one or several of carbon dioxide, carbon monoxide, and trace harmful gases. However, due to different application environments, there is no high requirement for the use efficiency of the internal space of the device, the weight, volume, flow resistance, and outlet cleanliness of the device. Moreover, the structure of the conventional gas purifier does not need to withstand the harsh aerospace launch mechanical environment. The air purification device for aerospace must meet the above series of requirements. In order to achieve this goal, in addition to the design of the device structure, the assembling process must be innovated to ensure the realization of the function of the product.

[0005] Therefore, the skilled person in the art provides a high-efficiency composite air purification device for aerospace and an assembling process thereof to solve the problems raised in the background. SUMMARY

[0006] The present application provides a high-efficiency composite air purification device for aerospace and an assembling process thereof, which combines the purification technologies of carbon dioxide, carbon monoxide, and volatile organic gases under the condition of limited weight and volume constraints, ensures high purification efficiency, low flow resistance, and high outlet cleanliness of the device, and ensures that the device still has high purification performance after being subjected to the harsh mechanical environment of aerospace launch.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The high-efficiency composite air purification device for aerospace comprises:

[0009] An outer cylinder, one end of the outer cylinder is installed with an outlet end cover, the other end of the outer cylinder is installed with an inlet end cover, the inlet end cover is installed with an air inlet;

[0010] Three coaxially arranged mesh cylinders, each of the three mesh cylinders is provided with a plurality of circular holes, the outermost mesh cylinder is arranged in the outer cylinder; one end of the three mesh cylinders is connected with the outlet end cover, the outlet end cover is provided with an air outlet between the outer cylinder and the outermost mesh cylinder, the other end of the three mesh cylinders is connected with the inlet end cover, the air inlet penetrates through the inlet end cover and communicates with the innermost mesh cylinder, the cavity formed between the middle mesh cylinder and the outermost mesh cylinder is filled with a lithium hydroxide medicine layer, and the cavity formed between the innermost mesh cylinder and the middle mesh cylinder is filled with a mixed layer of activated carbon and carbon monoxide catalyst.

[0011] Further, one end of the middle mesh cylinder away from the air inlet and away from the outlet end cover is installed with a first annular metal pressing plate, the inner side of the first annular metal pressing plate is filled with the lithium hydroxide medicine layer, and a plurality of first springs are arranged between the side of the first annular metal pressing plate away from the lithium hydroxide medicine layer and the outlet end cover, and the plurality of first springs are annularly distributed along the axis of the mesh cylinder.

[0012] Further, a rubber isolation layer is arranged between the first annular metal plate and the lithium hydroxide medicine layer, one end of the rubber isolation layer away from the outer cylinder extends into the first annular metal pressing plate and the outlet end cover along the outer wall of the middle mesh cylinder, and the end of the rubber isolation layer close to the outlet end cover is tied on the outer wall of the middle mesh cylinder by cotton thread.

[0013] Further, the part of the rubber isolation layer between the cotton thread and the first annular metal pressing plate is bent in the direction of the outer cylinder to form a hairpin-shaped expansion structure.

[0014] Further, one end of the innermost mesh cylinder away from the air inlet is installed with a second annular metal pressing plate, the inner side of the second annular metal pressing plate is filled with the mixed layer of activated carbon and carbon monoxide catalyst, and a plurality of second springs are arranged between the side of the second annular metal pressing plate away from the mixed layer of activated carbon and carbon monoxide catalyst and the outlet end cover, and the plurality of second springs are annularly distributed along the axis of the mesh cylinder.

[0015] Further, one end of the innermost mesh cylinder away from the air inlet is a blind end.

[0016] Further, the outer side of each of the three mesh cylinders is provided with a filter layer, and the inner side of each of the two mesh cylinders located at the outermost and the middle is also provided with a filter layer, and the filter layer is made of polypropylene filter cloth or ultra-fine glass fiber.

[0017] Further, the outer side of the outlet end cover is provided with an outlet protective cap. The air inlet is covered with an inlet protective cap.

[0018] Preferably, the diameter of the round hole on the net cylinder is 6mm.

[0019] The assembling process of the high-efficiency composite air purification device for aerospace application comprises the following steps:

[0020] Step one: paste the filter layer along the circumferential direction of the corresponding net cylinder position respectively;

[0021] Step two: assemble one end of the rubber isolation layer to one side of the first annular metal pressing plate, and then install a plurality of first springs at preset positions on the other side of the first annular metal pressing plate in an annular equidistant manner;

[0022] Step three: install a plurality of second springs at preset positions on one side of the second annular metal pressing plate in an annular equidistant manner;

[0023] Step four: connect the inlet end cover, the air inlet, and the end portions of the three net cylinders into a core body through screws, and prevent loosening and seal with glue;

[0024] Step five: after the glue of the above-mentioned components is dry, check the bonding quality, and load the purification functional material;

[0025] Step six: fix the core body on the assembling table, put a protective sleeve on the outer side of the outermost net cylinder to prevent the filter layer thereon from being contaminated during the assembling process, mix the activated carbon and the carbon monoxide catalyst in a certain proportion, and then load them into the cavities formed by the innermost net cylinder and the intermediate net cylinder to form an activated carbon and carbon monoxide catalyst mixed layer, the weight ratio of the mixing proportion ranges from 70:30 to 90:10. After the activated carbon and carbon monoxide catalyst mixed layer reaches the limiting height, load the lithium hydroxide medicine layer into the cavity formed between the intermediate net cylinder and the outermost net cylinder, which also reaches the limiting height; and use the external vibration method to vibrate the above-mentioned materials;

[0026] Step seven: place the first annular metal pressing plate on the loaded lithium hydroxide medicine layer, cover the lithium hydroxide medicine layer, and tie the end of the installed rubber isolation layer close to the outlet end cover to the end of the intermediate net cylinder with cotton thread; place the second annular metal pressing plate on the loaded activated carbon and carbon monoxide catalyst mixed layer, cover the activated carbon and carbon monoxide catalyst mixed layer; then install the outlet end cover, make the plurality of first springs abut between the outlet end cover and the first annular metal pressing plate, and make the plurality of second springs abut between the outlet end cover and the second annular metal pressing plate;

[0027] Step eight: remove the protective sleeve on the outermost net cylinder, confirm the filter layer is intact; install the outer cylinder on the core, cover the outlet end cover, press the first spring and the second spring with the outlet end cover, and fix the outlet end cover and the core with screws;

[0028] Step nine: seal the outlet end cover with the outlet protection cap, and seal the inlet with the inlet protection cap, to ensure that the lithium hydroxide drug layer and the carbon monoxide catalyst mixed layer in the device are sealed and stored.

[0029] Step ten: glue the inlet end cover, outlet end cover and outer cylinder, and ensure sealing; after the glue is dry, the installation is completed.

[0030] In the above technical solution, the high-efficiency composite air purification device for aerospace and the assembly process thereof provided by the application have the following beneficial effects:

[0031] 1. After the airflow enters from the inlet, it flows in the radial direction of the device, first passes through the mixed layer composed of activated carbon and carbon monoxide catalyst, which can absorb volatile organic compounds and catalytically oxidize carbon monoxide to carbon dioxide; then the airflow enters the lithium hydroxide drug layer, which can absorb carbon dioxide (including carbon dioxide entering from the inlet and carbon dioxide generated by the catalytic oxidation of carbon monoxide) and acidic harmful gases.

[0032] 2. The device assembled by the assembly process has a compact structure, and the ratio of the weight of the filled purification functional material to the structure weight reaches 70%, with high use efficiency.

[0033] 3. The device assembled by the assembly process has low flow resistance; the filling method used makes the airflow flow through the drug layer in the radial direction, the flow area is large, and the filling amount of the purification functional material is distributed appropriately.

[0034] 4. The structure of the device assembled by the assembly process is reasonably designed, high-strength, lightweight alloy structural materials are used, and spring compression structure, elastic isolation layer structure, structure anti-loose design, etc. make the gas purification device can withstand severe mechanical environment test.

[0035] 5. The device assembled by the assembly process has high outlet cleanliness and good sealing performance; the design of the assembly process of the multi-layer filter layer can reduce friction and filter dust. At the same time, the combination parts of the device are sealed with glue and anti-loose, which further improves the sealing performance of the device.

[0036] 6. The application adopts functional integration design, which saves system weight, volume and power consumption, and has high reliability; the carbon dioxide and trace harmful gas purification functions are integrated in one device, which also has the function of assisting in purifying microorganisms in the air.

[0037] 7. The application innovates the assembly process, the assembly process of the cylindrical radial flow structure filled with two or more materials, to ensure the assembly quality. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the technical personnel in the art better understand the technical solutions of the present application or prior art, the drawings needed in the embodiments will be introduced in detail below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by the ordinary skilled in the art according to these drawings.

[0039] Figure 1 A structure diagram of a high-efficiency composite air purification device for aerospace provided by an embodiment of the present application is shown in the figure.

[0040] Figure 2 A semi-sectional view of the high-efficiency composite air purification device for aerospace provided by the embodiment of the present application is shown in the figure.

[0041] Figure 3 A structure diagram of the A part in the middle is shown in the figure. Figure 2

[0042] Explanation of reference signs:

[0043] 1, outer cylinder; 2, air inlet; 3, mesh cylinder; 4, outlet end cover; 5, air outlet; 6, inlet end cover; 7, lithium hydroxide layer; 8, activated carbon and carbon monoxide catalyst mixed layer; 9, first annular metal pressing plate; 10, first spring; 11, rubber isolation layer; 12, cotton thread; 13, second annular metal pressing plate; 14, second spring; 15, outlet protection cap; 16, inlet protection cap; 17, filter layer. DETAILED DESCRIPTION

[0044] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings.

[0045] Referring to the figure shown; Figures 1-3

[0046] The high-efficiency composite air purification device for aerospace described in the embodiment of the present application comprises:

[0047] The outer cylinder 1 is provided with an outlet end cover 4 at one end, and an inlet end cover 6 at the other end, and the inlet end cover 6 is provided with an air inlet 2.

[0048] ​​Three coaxial net tubes 3, each of which is provided with a plurality of circular holes (not shown), the plurality of circular holes are uniformly and closely distributed to ensure the air flow efficiency, the outermost net tube 3 is arranged in the outer cylinder 1; one end of each of the three net tubes 3 is connected with the outlet end cover 4, the outlet end cover 4 is provided with an air outlet 5 between the outer cylinder 1 and the outermost net tube 3, the other end of each of the three net tubes 3 is connected with the inlet end cover 6, the air inlet 2 penetrates the inlet end cover 6 and communicates with the innermost net tube 3, the lithium hydroxide layer 7 is filled in the cavity formed between the middle net tube 3 and the outermost net tube 3, the active carbon and carbon monoxide catalyst mixed layer 8 is filled in the cavity formed between the innermost net tube 3 and the middle net tube 3. The outer cylinder 1 can protect the core gas flow guide formed by the three net tubes and the sealing during storage.

[0049] The air to be purified enters through the air inlet 2, and then passes through the active carbon and carbon monoxide catalyst mixed layer 8 and the lithium hydroxide layer 7, and then is discharged through the air outlet 5. The above-mentioned air to be purified can complete the purification of carbon monoxide, carbon dioxide, trace harmful gas and suspended particles in sequence, thereby improving the use efficiency of the device.

[0050] The traditional axial flow type purification device is redesigned into a radial flow type, the air flow path is widened, the flow resistance is small, the flow rate is low, and the reaction is more sufficient.

[0051] The first annular metal pressing plate 9 is installed at one end of the middle net tube 3 and the outermost net tube 3 away from the air inlet 2, the inner side of the first annular metal pressing plate 9 is filled with the lithium hydroxide layer 7, a plurality of first springs 10 are arranged between the side of the first annular metal pressing plate 9 away from the lithium hydroxide layer 7 and the outlet end cover 4, and the plurality of first springs 10 are annularly distributed along the axis of the net tube 3. The plurality of first springs 10 can make the lithium hydroxide layer 7 formed by lithium hydroxide particles closely arranged, and when the lithium hydroxide particles are consumed, the lithium hydroxide layer 7 changes and the air flow may be short-circuited. The plurality of first springs 10 can press the lithium hydroxide layer 7 tightly by applying force to the first annular metal pressing plate 9, thereby avoiding the air flow short-circuiting.

[0052] A rubber isolation layer 11 is arranged between the first annular metal plate 9 and the lithium hydroxide layer 7, one end of the rubber isolation layer 11 away from the outer cylinder 1 extends into the first annular metal pressing plate 9 and the outlet end cover 4 along the outer wall of the middle net tube 3, and the end of the rubber isolation layer 11 close to the outlet end cover 4 is tied on the outer wall of the middle net tube 3 by cotton thread 12.

[0053] The part of the rubber isolation layer 11 between the cotton thread 12 and the first annular metal pressing plate 9 is bent to form a hairpin-shaped expansion structure in the direction of the outer cylinder. When the lithium hydroxide particles are worn out, the first annular metal pressing plate 9 moves towards the lithium hydroxide layer 7 under the action of the plurality of first springs 11, and the hairpin-shaped expansion structure can be stretched to avoid affecting the movement of the first annular metal pressing plate 9 due to the fixation of the rubber isolation layer 11.

[0054] The lithium hydroxide layer 7 can absorb carbon dioxide (including carbon dioxide entering from the inlet and carbon dioxide generated by catalytic oxidation of carbon monoxide) and acidic harmful gases in the airflow.

[0055] The second annular metal pressing plate 13 is installed at the end away from the air inlet between the innermost mesh cylinder 3 and the intermediate mesh cylinder 3, and the inner side of the second annular metal pressing plate 13 is filled with an active carbon and carbon monoxide catalyst mixed layer 8. The side of the second annular metal pressing plate 14 away from the active carbon and carbon monoxide catalyst mixed layer 8 abuts against the outlet end cover 4, and a plurality of second springs 14 are annularly distributed along the axis of the mesh cylinder 3. The active carbon and carbon monoxide catalyst mixed layer 8 can absorb volatile organic compounds and catalytically oxidize carbon monoxide to carbon dioxide.

[0056] The plurality of second springs 14 can make the active carbon and carbon monoxide catalyst mixed layer 8 formed by active carbon particles and carbon monoxide catalyst particles closely arranged, and when the active carbon particles and carbon monoxide catalyst particles are worn out, the active carbon and carbon monoxide catalyst mixed layer 8 can change the difference in bed length, and the plurality of second springs 14 can press the active carbon and carbon monoxide catalyst mixed layer 8 tightly against the second annular metal pressing plate 13 to avoid airflow short circuiting.

[0057] When the lithium hydroxide layer 7 is worn out and the active carbon and carbon monoxide catalyst mixed layer 8 is worn out, the first annular metal pressing plate 9 and the rubber isolation layer 11 can effectively prevent the gas purified by the active carbon and carbon monoxide catalyst mixed layer 8 from entering the gap between the first annular metal pressing plate 9 and the second annular metal pressing plate 13, and can avoid the situation where the gas purified only by the active carbon and carbon monoxide catalyst mixed layer 8 is discharged from the outermost mesh cylinder 3 and the air outlet 5, thereby ensuring the overall purification effect.

[0058] The end of the innermost mesh cylinder 3 away from the air inlet is a blind end. The blind end allows air entering the innermost mesh cylinder 3 to flow radially along the mesh cylinder.

[0059] The outer side of each of the three net cylinders 3 is provided with a filter layer 17, and the inner side of each of the two net cylinders 3 located at the outermost and middle positions is also provided with a filter layer, respectively, the filter layer is made of polypropylene filter cloth or superfine glass fiber.

[0060] In addition to the filter layer on the outer surface of the net cylinder 3 located at the outermost position, the filter layers on the corresponding net cylinders at the remaining positions are all coarse filtering, and polypropylene filter cloth is adopted. The filter layer on the net cylinder located at the innermost position filters larger dust particles in the entering air, which avoids the leakage of the lithium hydroxide medicine layer 7 or the active carbon and carbon monoxide catalyst mixed layer 8, reduces the friction strength between the net cylinder 3 and the filled functional material (the lithium hydroxide medicine layer 7 or the active carbon and carbon monoxide catalyst mixed layer 8), and ensures that the functional material cannot leak even after experiencing severe friction in a mechanical environment test. The filter layer 17 on the outer surface of the net cylinder 3 located at the outermost position adopts superfine glass fiber, which can further ensure that the dust larger than 5 μm generated after vibration cannot leak into the cabin air, and ensure that the cleanliness of the air outlet 5 meets the requirements.

[0061] The outer side of the outlet end cover 4 is provided with an outlet protective cap 15, and the air inlet 2 is covered with an inlet protective cap 16, so as to ensure that the functional material in the device is stored in a sealed manner and the performance is prevented from being reduced.

[0062] The diameter of the circular hole on the net cylinder 3 is 6 mm.

[0063] The device has compact structure, high drug loading rate, and high purification efficiency. The structure is reasonably designed, high-strength and light-alloy structural materials are adopted, and spring compensation structure is adopted, so that the gas purification device can withstand severe mechanical environment test.

[0064] The assembly process of the high-efficiency composite air purification device for aerospace application includes the following steps:

[0065] Step one: the filter layer 17 is pasted along the circumferential direction of the corresponding net cylinder 3 position;

[0066] Step two: one end of the rubber isolation layer 11 is assembled on one side of the first annular metal pressing plate 9, and a plurality of first springs 10 are installed at equal intervals in a ring shape at the preset positions on the other side of the first annular metal pressing plate 9;

[0067] Step three: a plurality of second springs 14 are installed at equal intervals in a ring shape at the preset positions on one side of the second annular metal pressing plate 14;

[0068] Step four: the inlet end cover 6, the air inlet 2 and the end portions of the three net cylinders 3 are connected into a core body through screws, and glue is used for anti-loosening and sealing;

[0069] Step five: after the glue of the above-mentioned bonding parts is dry, check the bonding quality, and fill the purification functional material;

[0070] Step six: fix the core on the assembly table, put the protective sleeve on the outer side of the outermost mesh tube 3 to protect the filter layer 17 on it from being contaminated during assembly, mix the activated carbon and carbon monoxide catalyst in a weight ratio of 85:15, and then fill them into the cavity formed by the innermost mesh tube 3 and the middle mesh tube 3 to form an activated carbon and carbon monoxide catalyst mixed layer 8. When the activated carbon and carbon monoxide catalyst mixed layer 8 reaches the limit height, fill the lithium hydroxide drug layer 7 into the cavity formed between the middle mesh tube 3 and the outermost mesh tube 3, and also reach the limit height. Then use external vibration to compact the above-mentioned materials;

[0071] Step seven: place the first annular metal pressing plate 9 on the filled lithium hydroxide drug layer 7, cover it, and tie the end of the installed rubber isolation layer 11 near the outlet end cover 4 to the end of the middle mesh tube 3 with cotton thread 12. Place the second annular metal pressing plate 14 on the filled activated carbon and carbon monoxide catalyst mixed layer 8, cover it, and then install the outlet end cover 4. Make the multiple first springs 10 abut between the outlet end cover 4 and the first annular metal pressing plate 9, and make the multiple second springs 14 abut between the outlet end cover 4 and the second annular metal pressing plate 14.

[0072] Step eight: remove the protective sleeve on the outermost mesh tube 3 to confirm the integrity of the filter layer. Install the outer cylinder 1 on the core, cover the outlet end cover 4, and press the first spring 10 and the second spring 14 with the outlet end cover 4. Use screws to fix and connect the outlet end cover 4 and the core.

[0073] Step nine: seal the outlet end cover 4 with the outlet protection cap 17, and seal the inlet protection cap 18 with the inlet protection cap 18 to ensure that the lithium hydroxide drug layer 7 and the activated carbon and carbon monoxide catalyst mixed layer 8 in the device are sealed and preserved.

[0074] Step ten: apply glue to the joint between the inlet end cover 6, the outlet end cover 4, and the outer cylinder 1 to ensure sealing. After the glue is dry, the installation is complete.

[0075] The application assembly process uses three coaxial mesh tubes 3 to separate the internal space of the outer cylinder 1, and the uniform circular holes on each mesh tube 3 are closely distributed with a diameter of Φ6 mm to ensure the air flow efficiency. A small amount of activated carbon and carbon monoxide catalyst mixed layer 8 is filled between the mesh tube 3 located on the inner side and the mesh tube 3 located in the middle. A large amount of lithium hydroxide drug layer 7 is filled between the mesh tube 3 located in the middle and the mesh tube 3 located on the outer side. The gas flow of the gas inlet 2 enters from the mesh tube 3 located on the innermost side, passes through the three mesh tubes 3 in turn, and finally flows out from the device gas outlet 5, and the reaction is sufficient. The above-mentioned radial flow mode gradually increases the drug layer flow area, thereby reducing the flow resistance of the device.

[0076] The filling process of the drug layer adopts an external vibration mode to ensure that the purification functional materials (lithium hydroxide drug layer 7 and activated carbon and carbon monoxide catalyst mixed layer 8) are densely filled. The first spring 10 and the second spring 14 respectively compress and fix the filled functional materials (activated carbon and carbon monoxide catalyst mixed layer 8 and lithium hydroxide drug layer 7). The filling process of the application makes the device withstand the mechanical environment test. When the functional materials are broken after severe friction, the first spring 10 and the second spring 14 will be stretched by a certain amount to compensate for the reduced height of the functional materials, thereby avoiding the appearance of holes in the functional material layer, causing air flow short circuit and performance degradation.

[0077] Each mesh tube 3 is covered with a filter layer 17, which can prevent the material from leaking out after the functional materials are filled, reduce friction, and filter dust. At the same time, the filter layer 17 on the mesh tube 3 located on the outermost side prevents dust larger than 5 μm generated by the functional materials from entering the cabin air.

[0078] In order to reduce the structure weight and ensure the strength, the purification device uses a titanium alloy sheet metal structure, and a reinforcing rib is designed and processed on the outer cylinder 1 to improve the strength.

[0079] The filled activated carbon is high-quality coconut shell carbon, which has good removal capacity for most volatile organic gases. The CO catalyst is made by loading platinum and palladium noble metals on a carbon carrier, and has high purification efficiency.

[0080] The device assembled by the assembly process has low flow resistance. The filling method adopted makes the gas flow through the drug layer in the radial direction, the flow area is large, and the filling amount of the purification functional materials is suitable.

[0081] The device assembled by the assembly process has a reasonable structure design, uses high-strength and lightweight alloy structural materials, and adopts spring mechanism compensation structure, elastic isolation layer structure, and structure anti-loose design, so that the gas purification device can withstand severe mechanical environment tests.

[0082] The assembled device has high outlet cleanliness and good sealing performance. The design of the assembly process of the multi-layer filter layer can reduce friction and filter dust. Meanwhile, the combination parts of the device are sealed by glue and anti-loosening, further improving the sealing performance of the device.

[0083] The assembled device has the functions of purifying carbon dioxide and trace harmful gas, and has strong alkaline and inhibitory effect on microorganisms.

[0084] The above only describes some exemplary embodiments of the present application in a descriptive manner, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A high efficiency composite air purification device for aerospace applications, characterized by, The device comprises: An outer cylinder (1), one end of which is provided with an outlet end cover (4), and the other end of which is provided with an inlet end cover (6), and an air inlet (2) is arranged on the inlet end cover (6); Three coaxially arranged mesh cylinders (3), each of which is provided with a plurality of circular holes, and the outermost mesh cylinder (3) is arranged in the outer cylinder (1); one end of each of the three mesh cylinders (3) is connected with the outlet end cover (4), and an air outlet (5) is arranged on the outlet end cover (4) and between the outer cylinder (1) and the outermost mesh cylinder (3); the other end of each of the three mesh cylinders (3) is connected with the inlet end cover (6), the air inlet (2) penetrates through the inlet end cover (6) and communicates with the innermost mesh cylinder (3); a lithium hydroxide medicine layer (7) is filled in the cavity formed between the middle mesh cylinder (3) and the outermost mesh cylinder (3); an active carbon and carbon monoxide catalyst mixed layer (8) is filled in the cavity formed between the innermost mesh cylinder (3) and the middle mesh cylinder (3); A first annular metal pressing plate (9) is arranged at one end of the middle mesh cylinder (3) and the outermost mesh cylinder (3) and away from the air inlet (2), and a lithium hydroxide medicine layer (7) is filled in the inner side of the first annular metal pressing plate (9); A rubber isolation layer (11) is arranged between the first annular metal pressing plate (9) and the lithium hydroxide medicine layer (7), one end of the rubber isolation layer (11) away from the outer cylinder (1) extends into the space between the first annular metal pressing plate (9) and the outlet end cover (4) along the outer wall of the middle mesh cylinder (3), and the end of the rubber isolation layer (11) close to the outlet end cover (4) is tied to the outer wall of the middle mesh cylinder (3) by cotton thread (12); The part of the rubber isolation layer (11) between the cotton thread (12) and the first annular metal pressing plate (9) is bent in the direction of the outer cylinder (1) to form a hairpin-shaped expansion structure; A filter layer (17) is arranged on the outer side of each of the three mesh cylinders (3), and a filter layer is also arranged on the inner side of each of the two mesh cylinders (3) located at the outermost and middle positions, and the filter layer is made of polypropylene filter cloth or ultra-fine glass fiber; A plurality of first springs (10) are arranged between the side of the first annular metal pressing plate (9) away from the lithium hydroxide medicine layer (7) and the outlet end cover (4), and the plurality of first springs (10) are annularly distributed along the axis of the mesh cylinder (3); The plurality of first springs (10) can apply force to the first annular metal pressing plate (9) to compress the lithium hydroxide medicine layer (7).

2. The high efficiency composite air purification device for aerospace use according to claim 1, characterized by A second annular metal pressing plate (13) is arranged at one end of the innermost mesh cylinder (3) and the middle mesh cylinder (3) and away from the air inlet (2), and an active carbon and carbon monoxide catalyst mixed layer (8) is filled in the inner side of the second annular metal pressing plate (13); a plurality of second springs (14) are arranged between the side of the second annular metal pressing plate (13) away from the active carbon and carbon monoxide catalyst mixed layer (8) and the outlet end cover (4), and the plurality of second springs (14) are annularly distributed along the axis of the mesh cylinder (3).

3. The high efficiency composite air purification device for aerospace use according to claim 2, characterized by The far end of the innermost net cylinder (3) from the air inlet (2) is a blind end.

4. The high efficiency composite air purification device for aerospace use according to claim 3, characterized by The outer side of the outlet end cover (4) is provided with an outlet protective cap (15), and the air inlet (2) is covered with an inlet protective cap (16).

5. The high efficiency composite air purification device for aerospace use according to claim 4, characterized in that, The diameter of the round hole on the net cylinder (3) is 6 mm.

6. The high efficiency composite air purification device for aerospace use according to claim 5, characterized by The assembly process comprises the following steps: Step one: paste the filter layer (17) along the circumferential direction of the corresponding net cylinder (3) position respectively; Step two: assemble one end of the rubber isolation layer (11) to one side of the first annular metal pressing plate (9), and then install a plurality of first springs (10) at equal intervals in a ring shape at the preset positions on the other side of the first annular metal pressing plate (9); Step three: install a plurality of second springs (14) at equal intervals in a ring shape at the preset positions on one side of the second annular metal pressing plate (13); Step four: connect the inlet end cover (6), the air inlet (2) and the end portions of the three net cylinders (3) into a core body through screws, and use glue for anti-loosening and sealing; Step five: after the glue of the above-mentioned glued parts is dry, check the bonding quality, and fill the purification functional material; Step six: fix the core body on the assembly table, put a protective sleeve on the outer side of the outermost net cylinder (3) to protect the filter layer (17) on it from being contaminated during assembly, mix the activated carbon and the carbon monoxide catalyst in a certain proportion, and then load them into the cavities formed by the innermost net cylinder (3) and the middle net cylinder (3) to form an activated carbon and carbon monoxide catalyst mixed layer (8); when the activated carbon and carbon monoxide catalyst mixed layer (8) reaches the limiting height, load the lithium hydroxide medicine layer (7) into the cavity formed between the middle net cylinder (3) and the outermost net cylinder (3) to also reach the limiting height; and use external vibration to vibrate the above-mentioned materials; Step seven: place the first annular metal pressing plate (9) on the filled lithium hydroxide medicine layer (7) to cover the lithium hydroxide medicine layer (7), and tie the end of the installed rubber isolation layer (11) close to the outlet end cover (4) to the end of the middle net cylinder (3) with cotton thread (12); place the second annular metal pressing plate (13) on the filled activated carbon and carbon monoxide catalyst mixed layer (8) to cover the activated carbon and carbon monoxide catalyst mixed layer (8); then install the outlet end cover (4) so that the plurality of first springs (10) abut between the outlet end cover (4) and the first annular metal pressing plate (9), and the plurality of second springs (14) abut between the outlet end cover (4) and the second annular metal pressing plate (13); Step eight: remove the protective sleeve on the outermost net cylinder (3) to confirm the integrity of the filter layer; assemble the outer cylinder body (1) on the core body, cover the outlet end cover (4), and press the first springs (10) and the second springs (14) tightly with the outlet end cover (4); and fix and connect the outlet end cover (4) and the core body with screws; Step nine: seal the outlet end cover (4) with the outlet protective cap (15), and seal the air inlet (2) with the inlet protective cap (16) to ensure that the lithium hydroxide medicine layer (7) and the activated carbon and carbon monoxide catalyst mixed layer (8) in the device are sealed and stored. Step ten: glue the joint of the inlet end cover (6), the outlet end cover (4) and the outer cylinder (1) to ensure the sealing; after the glue is dry, the installation is completed.

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