阅读说明：本技术 一种具有集中排污功能的变压吸附制氮装置 (Pressure swing adsorption nitrogen making device with centralized pollution discharge function ) 是由 崔文朋 林宏洪 朱泽喜 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种具有集中排污功能的变压吸附制氮装置,包括防护箱,防护箱的右侧设置有第一储气机构,第一储气机构由第一连接管、第一储气罐和第二连接管组成,第一连接管的一端与第一储气罐固定连通,第一连接管的另一端延伸至防护箱的内部且固定连通有空气压缩机,防护箱的左侧面设置有进气机构,进气机构由进气管、隔板、进气孔和第一限位框组成,第一限位框的数量为两个,进气管的左侧面设置有过滤机构。本发明在关闭第一电磁阀的同时打开第二电磁阀,此时第四连接管所输送的高压气流会将滤网筒内的物质由排污管喷出,从而实现滤网筒内物质的集中排出,能够减少滤网筒上污质过多而影响制氮装置使用的情况,提高了该制氮装置的实用性。(The invention discloses a pressure swing adsorption nitrogen production device with a centralized pollution discharge function, which comprises a protective box, wherein a first air storage mechanism is arranged on the right side of the protective box, the first air storage mechanism consists of a first connecting pipe, a first air storage tank and a second connecting pipe, one end of the first connecting pipe is fixedly communicated with the first air storage tank, the other end of the first connecting pipe extends into the protective box and is fixedly communicated with an air compressor, an air inlet mechanism is arranged on the left side surface of the protective box, the air inlet mechanism consists of an air inlet pipe, a partition plate, an air inlet hole and a first limiting frame, the number of the first limiting frames is two, and a filtering mechanism is arranged on the left side surface of the air inlet pipe. According to the invention, the second electromagnetic valve is opened while the first electromagnetic valve is closed, and at the same time, the high-pressure airflow conveyed by the fourth connecting pipe can spray the substances in the filter screen cylinder out of the blow-off pipe, so that the substances in the filter screen cylinder are intensively discharged, the condition that the use of the nitrogen making device is influenced by excessive dirt on the filter screen cylinder can be reduced, and the practicability of the nitrogen making device is improved.)

1. The utility model provides a pressure swing adsorption nitrogen plant with concentrate blowdown function, its characterized in that, includes protective housing (1), the right side of protective housing (1) is provided with first gas storage mechanism, first gas storage mechanism comprises first connecting pipe (13), first gas holder (14) and second connecting pipe (15), the one end and the fixed intercommunication of first gas holder (14) of first connecting pipe (13), the other end of first connecting pipe (13) extends to the inside of protective housing (1) and fixed intercommunication has air compressor, the left surface of protective housing (1) is provided with air inlet mechanism, air inlet mechanism comprises intake pipe (2), baffle (3), inlet port (4) and first spacing frame (5), the quantity of first spacing frame (5) is two, the left surface of intake pipe (2) is provided with filtering mechanism, filtering mechanism is by a backup pad (6), The device comprises a filter screen (7), two supporting blocks (8), a connecting rod (9), a connecting plate (10), a first spring (11), two inserting plates (12) and two second limiting frames (41);

one end of the second connecting pipe (15) is communicated with the first air storage tank (14), the other end of the second connecting pipe (15) is communicated with an oil removing and drying mechanism, the oil removing and drying mechanism consists of an oil remover (16), a freezing type dryer (17) and a third connecting pipe (18), a purifying mechanism is arranged on the right side of the freezing type dryer (17), the purifying mechanism consists of a filtering chamber (19), a fourth connecting pipe (20), a fifth connecting pipe (21), a first electromagnetic valve (22), a threaded cover (23), a second electromagnetic valve (24), a drain pipe (25) and a filtering screen cylinder (26), and a second air storage tank (27) is arranged on the right side of the filtering chamber (19);

the right side of second gas holder (27) is provided with nitrogen making mechanism, nitrogen making mechanism comprises left four-way pipe (28), membrane separator (29), right four-way pipe (30) and third gas holder (31), be provided with exhaust mechanism on third gas holder (31), exhaust mechanism comprises first blast pipe (32), protection casing (33), second blast pipe (34), discharge valve (35), riser (36), pivot (37), montant (38), shutoff stopper (39) and second spring (40).

2. The pressure swing adsorption nitrogen making device with the centralized pollution discharge function is characterized in that the right side surface of the air inlet pipe (2) is fixedly communicated with the left side surface of the protective box (1), the partition plate (3) is fixedly installed inside the air inlet pipe (2), the air inlet hole (4) is arranged in the middle of the partition plate (3), and the two first limiting frames (5) are fixedly installed on one side, away from the protective box (1), of the air inlet pipe (2).

3. The pressure swing adsorption nitrogen making device with the centralized pollution discharge function according to claim 1, wherein the two support blocks (8) are fixedly installed on the support plate (6), the connecting rod (9) is fixedly installed between the two support blocks (8), the two connecting plates (10) are inserted and connected to the outer surface of the connecting rod (9), and the bottom ends of the two connecting plates (10) are fixedly connected to the two inserting plates (12) respectively.

4. The pressure swing adsorption nitrogen making device with the concentrated pollution discharge function according to claim 1, wherein the filter screen (7) is arranged in the middle of the support plate (6), the two first connecting pipes (13) are fixedly arranged on two sides of the front surface of the support plate (6) respectively, the outer surfaces of the two insertion plates (12) are connected with the inner walls of the two first connecting pipes (13) in an inserting mode respectively, the back surface of the support plate (6) is in contact with the front surface of the partition plate (3), and the outer surfaces of the two insertion plates (12) are connected with the inner walls of the two first limiting frames (5) in an inserting mode respectively.

5. The pressure swing adsorption nitrogen making device with the centralized pollution discharge function is characterized in that the first spring (11) is arranged on the outer surface of the connecting rod (9), the first spring (11) is positioned between the two connecting plates (10), and two ends of the first spring (11) are respectively fixedly connected with the two connecting plates (10).

6. The nitrogen generator with centralized blowdown function as claimed in claim 1, wherein the end of the second connecting pipe (15) far away from the first gas tank (14) is fixedly communicated with the degreaser (16), the third connecting pipe (18) is fixedly communicated between the degreaser (16) and the top of the freeze dryer (17), and the fourth connecting pipe (20) is fixedly connected between the freeze dryer (17) and the top of the filtering chamber (19).

7. The pressure swing adsorption nitrogen making device with the centralized sewage discharge function is characterized in that the threaded cover (23) is in threaded connection with the bottom end of the filtering chamber (19), the sewage discharge pipe (25) is fixedly communicated with the middle of the bottom end of the threaded cover (23), the second electromagnetic valve (24) is arranged in the middle of the sewage discharge pipe (25), one end of the fifth connecting pipe (21) is communicated with the filtering chamber (19), the other end of the fifth connecting pipe (21) is communicated with the second air storage tank (27), the first electromagnetic valve (22) is arranged in the middle of the fifth connecting pipe (21), and the filter screen cylinder (26) is arranged inside the filtering chamber (19).

8. The pressure swing adsorption nitrogen making device with the centralized pollution discharge function as claimed in claim 1, wherein the left four-way pipe (28) is fixedly arranged between the second air storage tank (27) and the membrane separator (29), and the right four-way pipe (30) is fixedly arranged between the membrane separator (29) and the third air storage tank (31).

9. The pressure swing adsorption nitrogen generating device with the centralized pollution discharge function as claimed in claim 1, wherein one end of the first exhaust pipe (32) is communicated with the third gas storage tank (31), the other end of the first exhaust pipe (32) penetrates through the protective cover (33) and extends to the inside of the protective cover (33), the second exhaust pipe (34) is fixedly communicated with one surface of the protective cover (33) far away from the first exhaust pipe (32), and the exhaust valve (35) is arranged in the middle of the second exhaust pipe (34).

10. The pressure swing adsorption nitrogen making device with the centralized pollution discharge function as claimed in claim 1, wherein the vertical plate (36) is fixedly installed at the top of the inner cavity of the protection cover (33), the rotating shaft (37) is fixedly installed on the front surface of the vertical plate (36), the inner wall of the vertical rod (38) is sleeved on the outer surface of the rotating shaft (37) through a bearing, the left side surface of the vertical rod (38) is fixedly connected with the right side surface of the sealing plug (39), the left side surface of the sealing plug (39) is in contact with the first exhaust pipe (32), and the second spring (40) is fixedly installed between the vertical rod (38) and the inner wall on the left side of the protection cover (33).

Technical Field

The invention relates to a nitrogen making device, in particular to a pressure swing adsorption nitrogen making device with a centralized pollution discharge function.

Background

Nitrogen gas of the chemical formula N₂The ammonia gas is colorless and tasteless gas, the chemical property of nitrogen is inactive, and the nitrogen can react with hydrogen under the conditions of high temperature, high pressure and catalyst to generate ammonia gas; the nitrogen can be combined with oxygen to generate nitric oxide under the condition of discharge, even active metals such as Ca, Mg, Sr and Ba can be reacted with the nitrogen only under the condition of heating, and the high chemical stability of the nitrogen is related to the molecular structure of the nitrogen.

Pressure swing adsorption nitrogen making device is common nitrogen making device, and nitrogen gas need let in nitrogen making built-in with the air after filtering in process of production, and air cleaner in the nitrogen making device is inside can produce the filth when using, and air cleaner among the current nitrogen making device is not convenient for concentrate the discharge to the filth to influence nitrogen making device's use. Therefore, we improve the above and provide a pressure swing adsorption nitrogen making device with centralized pollution discharge function.

Disclosure of Invention

In order to solve the technical problems, the invention provides the following technical scheme:

the invention relates to a pressure swing adsorption nitrogen production device with a centralized pollution discharge function, which comprises a protective box, wherein the right side of the protective box is provided with a first gas storage mechanism, the first gas storage mechanism consists of a first connecting pipe, a first gas storage tank and a second connecting pipe, one end of the first connecting pipe is fixedly communicated with the first gas storage tank, the other end of the first connecting pipe extends into the protective box and is fixedly communicated with an air compressor, the left side surface of the protective box is provided with an air inlet mechanism, the air inlet mechanism consists of an air inlet pipe, a clapboard, an air inlet hole and a first limit frame, the number of the first limit frames is two, the left side surface of the air inlet pipe is provided with a filtering mechanism, the filtering mechanism consists of a supporting plate, a filtering net, two supporting blocks, a connecting rod, a connecting plate, a first spring, two inserting plates and two second limiting frames;

one end of the second connecting pipe is communicated with the first gas storage tank, the other end of the second connecting pipe is communicated with an oil removing and drying mechanism, the oil removing and drying mechanism consists of an oil remover, a freezing type dryer and a third connecting pipe, a purifying mechanism is arranged on the right side of the freezing type dryer, the purifying mechanism consists of a filtering chamber, a fourth connecting pipe, a fifth connecting pipe, a first electromagnetic valve, a threaded cover, a second electromagnetic valve, a drain pipe and a filtering screen cylinder, and the second gas storage tank is arranged on the right side of the filtering chamber;

the right side of second gas holder is provided with nitrogen making mechanism, nitrogen making mechanism comprises left four-way pipe, membrane separator, right four-way pipe and third gas holder, be provided with exhaust mechanism on the third gas holder, exhaust mechanism comprises first blast pipe, protection casing, second blast pipe, discharge valve, riser, pivot, montant, shutoff and second spring.

As a preferred technical scheme of the invention, the right side surface of the air inlet pipe is fixedly communicated with the left side surface of the protective box, the partition plate is fixedly arranged in the air inlet pipe, the air inlet hole is arranged in the middle of the partition plate, and the two first limiting frames are fixedly arranged on one side of the air inlet pipe away from the protective box

As a preferred technical scheme of the invention, the two supporting blocks are fixedly arranged on the supporting plate, the connecting rod is fixedly arranged between the two supporting blocks, the two connecting plates are inserted and connected on the outer surface of the connecting rod, and the bottom ends of the two connecting plates are respectively fixedly connected with the two inserting plates.

As a preferred technical scheme of the invention, the filter screen is arranged in the middle of the support plate, the two first connecting pipes are respectively and fixedly installed on two sides of the front surface of the support plate, the outer surfaces of the two inserting plates are respectively and alternately connected with the inner walls of the two first connecting pipes, the back surface of the support plate is in contact with the front surface of the partition plate, and the outer surfaces of the two inserting plates are respectively and alternately connected with the inner walls of the two first limiting frames.

As a preferred technical solution of the present invention, the first spring is disposed on an outer surface of the connecting rod, the first spring is located between the two connecting plates, and two ends of the first spring are respectively fixedly connected to the two connecting plates.

As a preferable technical solution of the present invention, one end of the second connecting pipe, which is far away from the first gas tank, is fixedly communicated with the degreaser, the third connecting pipe is fixedly communicated between the degreaser and the top of the freeze dryer, and the fourth connecting pipe is fixedly connected between the freeze dryer and the top of the filter chamber.

As a preferred technical scheme of the invention, the threaded cover is in threaded connection with the bottom end of the filtering chamber, the drain pipe is fixedly communicated with the middle part of the bottom end of the threaded cover, the second electromagnetic valve is arranged in the middle part of the drain pipe, one end of the fifth connecting pipe is communicated with the filtering chamber, the other end of the fifth connecting pipe is communicated with the second air storage tank, the first electromagnetic valve is arranged in the middle part of the fifth connecting pipe, and the filter screen cylinder is arranged inside the filtering chamber.

As a preferable technical scheme of the invention, the left four-way pipe is fixedly arranged between the second air storage tank and the membrane separator, and the right four-way pipe is fixedly arranged between the membrane separator and the third air storage tank.

As a preferable technical solution of the present invention, one end of the first exhaust pipe is communicated with the third air storage tank, the other end of the first exhaust pipe penetrates through the protective cover and extends into the protective cover, the second exhaust pipe is fixedly communicated with one surface of the protective cover far away from the first exhaust pipe, and the exhaust valve is disposed in the middle of the second exhaust pipe.

As a preferred technical scheme, the vertical plate is fixedly installed at the top of the inner cavity of the protective cover, the rotating shaft is fixedly installed on the front side of the vertical plate, the inner wall of the vertical rod is sleeved on the outer surface of the rotating shaft through the bearing, the left side surface of the vertical rod is fixedly connected with the right side surface of the sealing plug, the left side surface of the sealing plug is in contact with the first exhaust pipe, and the second spring is fixedly installed between the vertical rod and the inner wall of the left side of the protective cover.

The invention has the beneficial effects that: the pressure swing adsorption nitrogen making device with the centralized pollution discharge function is characterized in that the second electromagnetic valve is opened while the first electromagnetic valve is closed, at the same time, high-pressure airflow conveyed by the fourth connecting pipe can spray out substances in the filter screen cylinder through the blow-off pipe, so that the concentrated discharge of the substances in the filter screen cylinder is realized, the condition that the use of the nitrogen making device is influenced by excessive substances on the filter screen cylinder can be reduced, the practicability of the nitrogen making device is improved, air entering the air inlet pipe and the interior of the protective box can be preliminarily filtered by arranging the filter screen, the filtering pressure of the filter screen cylinder can be reduced, the damage of dust to an air compressor, an oil remover and a freeze dryer in the protective box can be reduced, the service life of the nitrogen making device is prolonged, the two connecting plates are pushed to drive the two inserting plates to mutually approach and respectively separate from the two first limiting frames, the supporting plate can be taken down from the air inlet pipe by pulling the connecting plates outwards, therefore, a user can clean the filter screen conveniently, when the nitrogen in the third air storage tank is used up, the air pressure in the first air exhaust pipe is the same as the air pressure in the second air exhaust pipe, at the moment, the acting force of the second spring can pull the vertical rod to enable the vertical rod to drive the sealing plug to be in contact with the first air exhaust pipe and seal the first air exhaust pipe, so that the external air is prevented from entering the third air storage tank through the second air exhaust pipe and the first air exhaust pipe, the practicability of the nitrogen making device is further improved, the nitrogen making device is designed in an integrated mode, the productivity and the purity are remarkably improved, and the nitrogen making device is easy to popularize and use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a pressure swing adsorption nitrogen plant with a centralized blowdown function according to the present invention;

FIG. 2 is a schematic structural view of a filtering chamber and a threaded cover of a pressure swing adsorption nitrogen generator with centralized sewage discharge function according to the present invention;

FIG. 3 is a schematic structural diagram of an air inlet pipe and a support plate of a pressure swing adsorption nitrogen generator with centralized pollution discharge function according to the present invention;

FIG. 4 is a schematic cross-sectional view of the filtering chamber of the pressure swing adsorption nitrogen generator with centralized sewage discharge function according to the present invention;

FIG. 5 is a schematic cross-sectional view of a shield of a pressure swing adsorption nitrogen plant with a centralized blowdown function according to the present invention;

FIG. 6 is an enlarged schematic view of the position A of the pressure swing adsorption nitrogen generator with centralized blowdown function according to the present invention.

In the figure: 1. a protective box; 2. an air inlet pipe; 3. a partition plate; 4. an air inlet; 5. a first limit frame; 6. a support plate; 7. a filter screen; 8. a support block; 9. a connecting rod; 10. a connecting plate; 11. a first spring; 12. inserting plates; 13. a first connecting pipe; 14. a first gas storage tank; 15. a second connecting pipe; 16. an oil remover; 17. a freeze dryer; 18. a third connecting pipe; 19. a filtering chamber; 20. a fourth connecting pipe; 21. a fifth connecting pipe; 22. a first solenoid valve; 23. a threaded cap; 24. a second solenoid valve; 25. a blow-off pipe; 26. a screen cylinder; 27. a second gas tank; 28. a left four-way pipe; 29. a membrane separator; 30. a right four-way pipe; 31. a third gas storage tank; 32. a first exhaust pipe; 33. a protective cover; 34. a second exhaust pipe; 35. an exhaust valve; 36. a vertical plate; 37. a rotating shaft; 38. a vertical rod; 39. blocking; 40. a second spring; 41. and a second limit frame.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example (b): as shown in figures 1-6, the pressure swing adsorption nitrogen making device with the centralized pollution discharge function comprises a protection box 1, wherein a first air storage mechanism is arranged on the right side of the protection box 1 and consists of a first connecting pipe 13, a first air storage tank 14 and a second connecting pipe 15, one end of the first connecting pipe 13 is fixedly communicated with the first air storage tank 14, the other end of the first connecting pipe 13 extends into the protection box 1 and is fixedly communicated with an air compressor, an air inlet mechanism is arranged on the left side surface of the protection box 1 and consists of an air inlet pipe 2, a partition plate 3, an air inlet 4 and a first limiting frame 5, the number of the first limiting frames 5 is two, a filtering mechanism is arranged on the left side surface of the air inlet pipe 2 and consists of a supporting plate 6, a filter screen 7, two supporting blocks 8, a connecting rod 9, a connecting plate 10, a first spring 11, a second spring 11, a third spring and a fourth spring, Two inserting plates 12 and two second limiting frames 41;

one end of the second connecting pipe 15 is communicated with the first gas storage tank 14, the other end of the second connecting pipe 15 is communicated with an oil removing and drying mechanism, the oil removing and drying mechanism consists of an oil remover 16, a freezing type dryer 17 and a third connecting pipe 18, a purifying mechanism is arranged on the right side of the freezing type dryer 17, the purifying mechanism consists of a filtering chamber 19, a fourth connecting pipe 20, a fifth connecting pipe 21, a first electromagnetic valve 22, a threaded cover 23, a second electromagnetic valve 24, a drain pipe 25 and a filtering screen cylinder 26, and a second gas storage tank 27 is arranged on the right side of the filtering chamber 19;

the right side of the second air storage tank 27 is provided with a nitrogen making mechanism, the nitrogen making mechanism consists of a left four-way pipe 28, a membrane separator 29, a right four-way pipe 30 and a third air storage tank 31, the third air storage tank 31 is provided with an exhaust mechanism, and the exhaust mechanism consists of a first exhaust pipe 32, a protective cover 33, a second exhaust pipe 34, an exhaust valve 35, a vertical plate 36, a rotating shaft 37, a vertical rod 38, a plugging plug 39 and a second spring 40.

Wherein, the right flank of intake pipe 2 and the fixed intercommunication of left surface of protective housing 1, 3 fixed mounting of baffle are in the inside of intake pipe 2, and inlet port 4 begins at the middle part of baffle 3, and two equal fixed mounting of first spacing frame 5 can restrict the position of backup pad 6 through setting up baffle 3 on one side that protective housing 1 was kept away from to intake pipe 2 to improve the stability between inlet port 4 and the intake pipe 2.

Wherein, two equal fixed mounting of supporting shoe 8 are in backup pad 6, connecting rod 9 fixed mounting is between two supporting shoes 8, two connecting plates 10 all alternate the surface of connecting rod 9, the bottom of two connecting plates 10 respectively in two picture peg 12 fixed connection, can support connecting rod 9 through setting up two supporting shoes 8, can link together two picture pegs 12 with connecting rod 9 through setting up two connecting plates 10, thereby can change the position of picture peg 12 when promoting connecting plate 10.

Wherein, filter screen 7 sets up the middle part at backup pad 6, two first connecting pipes 13 are fixed mounting respectively in the positive both sides of backup pad 6, the surface of two picture pegs 12 alternates with the inner wall of two first connecting pipes 13 respectively and is connected, the back of backup pad 6 and the front contact of baffle 3, the surface of two picture pegs 12 alternates with the inner wall of two first spacing frames 5 respectively and is connected, make two connecting plates 10 drive two picture pegs 12 and be close to each other and separate with two first spacing frames 5 respectively through promoting two connecting plates, outside pulling connecting plate 10 can be taken off backup pad 6 from intake pipe 2, thereby convenient to use person clears up filter screen 7.

Wherein, first spring 11 sets up the surface at connecting rod 9, and first spring 11 is located between two connecting plates 10, the both ends of first spring 11 respectively with two connecting plates 10 fixed connection, and first spring 11's effort can promote two connecting plates 10 and keep away from each other, can drive two picture peg 12 through two connecting plates 10 and keep away from each other to can improve the stability of being connected between picture peg 12 and the first spacing frame 5.

Wherein, the end of the second connecting pipe 15 far away from the first air storage tank 14 is fixedly communicated with the oil remover 16, the third connecting pipe 18 is fixedly communicated between the oil remover 16 and the top of the freezing type dryer 17, the fourth connecting pipe 20 is fixedly connected between the freezing type dryer 17 and the top of the filter chamber 19, oil in the air can be removed by arranging the oil remover 16, and the compressed air can be dried by arranging the freezing type dryer 17, thereby reducing the moisture in the compressed air.

Wherein, the bottom at filter chamber 19 is connected to screw cap 23 threaded connection, the fixed middle part that communicates in screw cap 23 bottom of blow off pipe 25, second solenoid valve 24 sets up the middle part at blow off pipe 25, the one end and the filter chamber 19 intercommunication of fifth connecting pipe 21, the other end and the second gas holder 27 intercommunication of fifth connecting pipe 21, first solenoid valve 22 sets up the middle part at fifth connecting pipe 21, filter screen cylinder 26 sets up the inside at filter chamber 19, open second solenoid valve 24 when closing first solenoid valve 22, the high pressure air current that fourth connecting pipe 20 carried this moment can be with the material in the filter screen cylinder 26 by blow off pipe 25 blowout, thereby realize the concentrated discharge of material in the filter screen cylinder 26, can reduce the condition that the filter screen cylinder 26 goes up the pollutant too much and influence nitrogen generator to use, the practicality of this nitrogen generator has been improved.

Wherein, the left four-way pipe 28 is fixedly arranged between the second air storage tank 27 and the membrane separator 29, the right four-way pipe 30 is fixedly arranged between the membrane separator 29 and the third air storage tank 31, the filtered compressed air can be stored by arranging the second air storage tank 27, and the oxygen and the nitrogen can be separated by arranging the membrane separator 29.

Wherein, the one end and the third gas holder 31 intercommunication of first blast pipe 32, the other end of first blast pipe 32 runs through protection casing 33 and extends to the inside of protection casing 33, and the fixed intercommunication of second blast pipe 34 is kept away from first blast pipe 32 in protection casing 33 in the one side, and discharge valve 35 sets up at the middle part of second blast pipe 34, can control the air output of second blast pipe 34 through setting up discharge valve 35, and then improves this nitrogen making device's practicality.

Wherein, the vertical plate 36 is fixedly arranged at the top of the inner cavity of the protective cover 33, the rotating shaft 37 is fixedly arranged on the front surface of the vertical plate 36, the inner wall of the vertical rod 38 is sleeved on the outer surface of the rotating shaft 37 through a bearing, the left side surface of the vertical rod 38 is fixedly connected with the right side surface of the plugging plug 39, the left side surface of the plugging plug 39 is contacted with the first exhaust pipe 32, the second spring 40 is fixedly arranged between the vertical rod 38 and the inner wall of the left side of the protective cover, when the nitrogen in the third air storage tank 31 is used up, the air pressure in the first exhaust pipe 32 is the same as the air pressure in the second exhaust pipe 34, at this time, the acting force of the second spring 40 can pull the vertical rod 38 to make the vertical rod 38 drive the sealing plug 39 to contact with the first exhaust pipe 32 and seal the first exhaust pipe 32, thereby preventing the external air from entering the third air storage tank 31 through the second exhaust pipe 34 and the first exhaust pipe 32, and further improving the practicability of the nitrogen making device.

When the device works, air compressed by an air compressor in the protective box 1 is conveyed into a first air storage tank 14 through a first connecting pipe 13, the compressed air in the first air storage tank 14 enters an oil remover 16 through a second connecting pipe 15, oil is removed by the oil remover 16, the oil-removed compressed air is conveyed into a freeze dryer 17 through a third connecting pipe 18 and is freeze-dried by the freeze dryer 17, the dried compressed air is conveyed into a filter chamber 19 through a fourth connecting pipe 20, the compressed air can be filtered through a filter screen cylinder 26 in the filter chamber 19, the filtered substances stay in the filter screen cylinder 26, the filtered compressed air is conveyed into a second air storage tank 27 through a fifth connecting pipe 21, the compressed air in the second air storage tank 27 enters a membrane 29 through a left four-way pipe 28, the compressed air is separated through the membrane 29, the separated nitrogen is conveyed into a third air storage tank 31 through a right four-way pipe 30, after the exhaust valve 35 is opened, the nitrogen in the third gas storage tank 31 is exhausted into the equipment using the nitrogen through the first exhaust pipe 32, the protective cover 33 and the protective cover 33;

in the using process, the second electromagnetic valve 24 is opened while the first electromagnetic valve 22 is closed, at the same time, the high-pressure airflow conveyed by the fourth connecting pipe 20 can spray the substances in the filter screen cylinder 26 out of the blow-off pipe 25, so that the concentrated discharge of the substances in the filter screen cylinder 26 is realized, the condition that the use of the nitrogen making device is affected due to excessive dirt on the filter screen cylinder 26 can be reduced, the practicability of the nitrogen making device is improved, the air entering the air inlet pipe 2 and the protection box 1 can be preliminarily filtered by arranging the filter screen 7, the filtering pressure of the filter screen cylinder 26 can be reduced, the damage of dust to the air compressor, the oil remover 16 and the freezing dryer 17 in the protection box 1 can be reduced, the service life of the nitrogen making device is prolonged, the two connecting plates 10 are pushed to drive the two inserting plates 12 to mutually approach and respectively separate from the two first limit frames 5, the support plate 6 can be taken down from the air inlet pipe 2 by pulling the connecting plate 10 outwards, so that a user can clean the filter screen 7 conveniently, when the nitrogen in the third air storage tank 31 is used up, the air pressure in the first exhaust pipe 32 is the same as the air pressure in the second exhaust pipe 34, at the moment, the acting force of the second spring 40 can pull the vertical rod 38 to enable the vertical rod 38 to drive the sealing plug 39 to be in contact with the first exhaust pipe 32 and seal the first exhaust pipe 32, and therefore the external air is prevented from entering the third air storage tank 31 from the second exhaust pipe 34 and the first exhaust pipe 32, the practicability of the nitrogen making device is further improved, and the nitrogen making device is designed in an integrated mode, is remarkably improved in the aspects of productivity and purity, and is easy to popularize and use.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.