Nitrogen purification device

Abstract

The utility model discloses a nitrogen purification device, and relates to the technical field of gas purification. A sealing cover is mounted at the top of the purification tank, a plurality of part replacing openings are annularly formed in the sealing cover, the part replacing openings are rotationally connected with inner pipes, a top cover is mounted at the top ends of the inner pipes, outer pipes matched with the inner pipes are fixedly connected in the purification tank, adsorbents are mounted in the inner pipes, and positioning assemblies are arranged on one sides of the part replacing openings; a plurality of inner reaction openings are evenly formed in the inner pipe along the circumferential side face, a plurality of outer reaction openings matched with the inner reaction openings are formed in the outer pipe along the circumferential side face, the outer side wall of the inner pipe is attached to the inner side wall of the outer pipe, and a rotary table is arranged between the bottom face of the inner pipe and the bottom of the outer pipe. By regulating the rotation included angle between the inner pipe and the outer pipe for installing the adsorbent in the purification tank, regulation of the size of the internal reaction window outside the purification tank is realized, and nitrogen leakage during adsorbent replacement is effectively reduced while opening of the purification tank is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas purification, and particularly to a nitrogen purification device. Background Art

[0002] Nitrogen purification is a process of separating and purifying nitrogen from a mixed gas or air. This process aims to remove impurities or other gas components in nitrogen to reach the required purity level. There are usually several methods for nitrogen purification, such as membrane separation, adsorbents, and overcondensation. When using adsorbents for purification, as the adsorption amount increases, the adsorption capacity of the adsorbent itself decreases, so the adsorbent needs to be replaced in a timely manner.

[0003] The patent specification with the publication number CN108910842A discloses a nitrogen purification device, which includes a purification tank and an air inlet and an air outlet installed on the purification tank. A feed pipe and a discharge pipe are installed on the purification tank. The feed pipe and the discharge pipe are connected to a reaction pipe inside the purification tank, and the reaction pipe communicates with the purification tank. The feed pipe, the discharge pipe, and the reaction pipe have the same diameter and are located on the same circle. Catalyzers are installed in the feed pipe, the discharge pipe, and the reaction pipe, and the catalyzers are filled with catalysts for purifying nitrogen.

[0004] To achieve the purpose of replacing the catalyzer without opening the purification tank, the feed pipe and the discharge pipe are installed on both sides of the reaction pipe inside the purification tank, and catalyzers are placed in the feed pipe, the discharge pipe, and the reaction pipe. By pushing the catalyzer in the feed pipe, the used catalyzer in the reaction pipe is pushed to the discharge pipe to achieve the purpose of cyclic replacement of the catalyzer. The disadvantages of this technical solution are as follows: Since the catalyzer or adsorbent needs to be in direct contact with nitrogen during use, that is, the adsorbent and nitrogen are in a connected state during use, and the adsorbent itself is a replaceable part, it also needs to be connected to the outside during replacement. Moreover, the nitrogen pressure in the purification tank is greater than the external atmospheric pressure. Therefore, during the process of replacing the adsorbent in the existing purification tank, the nitrogen in the purification tank will be connected to the outside atmosphere, and the high-pressure nitrogen inside will leak at this time, that is, the existing purification device cannot prevent the internal nitrogen from leaking due to being connected to the outside atmosphere during the replacement of the adsorbent. Summary of the Invention

[0005] The purpose of the present invention is to provide a nitrogen purification device, and the technical problem to be solved is as follows: When replacing the adsorbent in the existing purification tank, the nitrogen inside the purification tank will leak due to being connected to the outside atmosphere.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A nitrogen purification device, comprising a purification tank, a cover is installed on the top of the purification tank, a number of component replacement ports are arranged around the cover in a ring, an inner tube is rotatably connected to the component replacement port, a top cover is installed at the top of the inner tube, an outer tube is fixedly connected to the inner tube in a matching manner inside the purification tank, an adsorbent is installed inside the inner tube, a positioning component is arranged on one side of the component replacement port, and the inner tube and the outer tube are used to cooperate with the positioning component to control the sealing state of nitrogen;

[0008] A number of inner reaction ports are evenly arranged on the circumferential side of the inner tube, a number of outer reaction ports are arranged on the circumferential side of the outer tube in a matching manner with the inner reaction ports, the outer side wall of the inner tube is in contact with the inner side wall of the outer tube, and a turntable is arranged between the bottom surface of the inner tube and the bottom of the outer tube.

[0009] As a further scheme of the present invention: one side of the top of the inner tube is fixedly connected with a position-changing plate, one side of the position-changing plate is fixedly connected with a reaction bolt, the reaction bolt is threadedly connected with a first locking nut, the side of the position-changing plate away from the reaction bolt is fixedly connected with a sealing bolt, the sealing bolt is threadedly connected with a second locking nut, and an inner sealing plate is arranged between two adjacent inner reaction ports.

[0010] As a further scheme of the present invention: a handle is fixedly connected to the top of the top cover, and a sealing gasket is installed at the top inside the top cover.

[0011] As a further scheme of the present invention: the positioning component includes a reaction plate fixedly connected to one side of the component replacement port, a first positioning hole is opened in the reaction plate in a matching manner with the reaction bolt, a sealing plate is fixedly connected to one side of the component replacement port, and a second positioning hole is opened in the bottom side of the sealing plate in a matching manner with the sealing bolt.

[0012] As a further scheme of the present invention: a bearing is installed inside the component replacement port, the inner side of the bearing is fixedly connected to the top of the inner tube, the turntable includes a rotating seat fixedly connected to the inner bottom surface of the outer tube, the top of the rotating seat is rotatably connected to a rotating disc, and the top of the rotating disc abuts against the bottom surface of the inner tube.

[0013] As a further scheme of the present invention: the included angle between the two sides of the inner sealing plate and the axis of the inner tube is greater than the included angle between the two sides of the outer reaction port and the axis of the outer tube, and the vertical length of the inner sealing plate is greater than the vertical length of the outer reaction port.

[0014] As a further scheme of the present invention: the included angle between the reaction plate and the sealing plate and the axis of the inner tube is equal to the included angle between the central vertical plane of the inner reaction port and the central vertical plane of the adjacent inner sealing plate.

[0015] As a further scheme of the present invention: the outer side wall of the inner tube is in contact with the inner side wall of the outer tube.

[0016] Advantages of the present invention:

[0017] 1. In the present invention, by providing an inner tube, an outer tube and a top cover, a plurality of inner reaction ports are evenly arranged on the circumferential side of the part of the inner tube located inside the purification tank. Inner sealing plates are arranged between adjacent inner reaction ports. The outer tube located inside the purification tank is provided with a corresponding number of outer reaction ports adapted to each inner reaction port. The inner tube extends to the outside of the purification tank and its opening and closing state is controlled by the top cover. When the top cover is closed, the inner reaction ports communicate with the outer reaction ports, and the adsorbent located inside the inner tube communicates with the inside of the purification tank. When the top cover is opened, the inner tube is rotated to cause the inner sealing plates to close the outer reaction ports of the outer tube. The adsorbent inside the inner tube is isolated from the nitrogen inside the purification tank and can be replaced by itself. That is, while the present application realizes the function of replacing the adsorbent without opening the purification tank, it further reduces the leakage of nitrogen inside the purification tank due to its connection with the outside during the replacement of the adsorbent;

[0018] 2. In the present invention, by providing an inner tube and a positioning component, a transposition plate is arranged at the top of the inner tube extending to the outside of the purification tank. A reaction bolt and a sealing bolt are respectively installed on both sides of the transposition plate. Locking nuts I and II are respectively installed on the reaction bolt and the sealing bolt. The positioning component installed at the replacement port on the top of the purification tank is fixedly connected to a reaction plate and a sealing plate respectively adapted to the reaction bolt and the sealing bolt. When the external adjustment reaction bolt is locked at the reaction plate, the inside of the purification tank is in a reaction state. When the external adjustment sealing bolt is locked at the sealing bolt, the nitrogen inside the purification tank is isolated from the external atmosphere. The purpose is to complete the regulation of the reaction state inside the purification tank by operating the inner tube and the positioning component outside the purification tank, and at the same time ensure that the inner tube and the outer tube are in a stable closed state when replacing the adsorbent, effectively avoiding the accidental leakage of nitrogen in the tank;

[0019] Furthermore, the adsorption effect of the adsorbent is affected by the service duration, and there is a phenomenon that the adsorption capacity is strong in the early stage of installation and weak in the later stage, that is, there is a decline process in the adsorption capacity of the adsorbent after installation. When the inner reaction ports of the inner tube and the outer reaction ports of the outer tube are always in a fully open state, the decline process of the adsorbent is relatively fast. However, since the staggered opening sizes between the inner reaction ports and the outer reaction ports are affected by the position of the external transposition plate, by gradually moving the transposition plate from the side close to the sealing plate to the side close to the reaction plate, the reaction window between the inner reaction ports and the outer reaction ports inside gradually increases, thereby balancing the decline process of the adsorbent. That is, when externally regulating the reaction window size inside the purification tank, it can also be used to control the adsorption speed inside the purification tank, extend the service life of the adsorbent, and the extension of the service life of the adsorbent directly reduces the frequency of opening the top cover of the purification tank, indirectly avoiding the leakage of nitrogen in the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the top of the inner tube of the present invention;

[0024] Figure 4 It is a partial sectional view of the present invention;

[0025] Figure 5 It is the present invention Figure 2 The enlarged detail view of part A in;

[0026] Figure 6 It is the present invention Figure 4 The enlarged detail view of part B in;

[0027] Figure 7 It is the present invention Figure 4 The enlarged detail view of part C in;

[0028] Figure 8 It is the present invention Figure 4 The enlarged detail view of part D in.

[0029] In the figure: 1, purification tank; 2, cover; 3, replacement port; 4, inner tube; 41, inner reaction port; 42, transposition plate; 43, reaction bolt; 44, locking nut one; 45, sealing bolt; 46, locking nut two; 47, inner sealing plate; 5, outer tube; 51, outer reaction port; 6, adsorbent; 7, positioning component; 71, reaction plate; 72, positioning hole one; 73, sealing plate; 74, positioning hole two; 8, top cover; 81, handle; 82, sealing washer; 9, turntable; 91, rotating seat; 92, turntable; 10, barometer; 11, pressure regulator; 12, pressure regulating handle; 13, inlet pipe; 14, control valve; 15, outlet pipe; 16, bearing. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] Such as Figures 1 to 8As shown in the figure, a nitrogen purification device includes a purification tank 1. A cover 2 is fixedly connected to the top of the purification tank 1. Four replacement ports 3 are arranged along the circumferential direction on the cover 2. Each replacement port 3 is rotatably connected to an inner tube 4. Inside the purification tank 1, an outer tube 5 is fixedly connected to fit each inner tube 4. An adsorbent 6 is installed inside the inner tube 4. A positioning component 7 is arranged on one side of the replacement port 3. A top cover 8 is installed at the top of the inner tube 4. The inner tube 4 and the outer tube 5 are used to cooperate with the positioning component 7 to control the sealing state of nitrogen.

[0032] Four inner reaction ports 41 are evenly arranged on the circumferential side of the inner tube 4. Four outer reaction ports 51 are also evenly arranged on the circumferential side of the outer tube 5. The outer side wall of the inner tube 4 is attached to the inner side wall of the outer tube 5. A turntable 9 is arranged between the bottom surface of the inner tube 4 and the bottom of the outer tube 5.

[0033] It should be noted that flange connection plates are arranged on the adjacent surfaces of the cover 2 and the purification tank 1 and are fixed by circumferentially installed bolts, so as to provide a sealed environment for the purification process and a suitable environment for the purification of high-pressure nitrogen inside. The replacement port 3 provides an operating platform for the replacement of the adsorbent 6. The replacement port 3 is a horizontal platform that diverges from the center of the cover 2 outward.

[0034] As Figure 1 shown, a barometer 10 is installed on the outer side surface of the purification tank 1. A pressure regulator 11 is connected to one side of the barometer 10. A pressure regulating handle 12 is installed on the bottom surface of the pressure regulator 11. An inlet pipe 13 is installed on one side of the pressure regulator 11. A control valve 14 is installed between the inlet pipe 13 and the pressure regulator 11. An outlet pipe 15 is installed on one side of the bottom of the purification tank 1.

[0035] It should be noted that during the nitrogen purification process, nitrogen enters the purification tank 1 through the inlet pipe 13 via the pressure regulator 11 and the barometer 10. During the entry process, its intake volume is regulated by the control valve 14. At the same time, the pressure regulator 11 is used to control the inlet pressure, and the pressure is displayed by the barometer 10. Therefore, during the replacement process of the adsorbent 6, the pressure inside the purification tank 1 can be lowered to reduce the pressure difference between the internal compressed nitrogen and the external atmospheric pressure, so as to achieve the effect of assisting in the replacement of the adsorbent 6. And the purified nitrogen after adsorption treatment is finally discharged through the outlet pipe 15. During the purification process, the cover 2 does not need to be opened.

[0036] As Figures 2 to 4 、 Figure 6 shown, a displacement plate 42 is fixedly connected to one side at the top of the inner tube 4. A reaction bolt 43 is fixedly connected to one side of the displacement plate 42. The reaction bolt 43 is threadedly connected to a first locking nut 44. A sealing bolt 45 is fixedly connected to the side of the displacement plate 42 away from the reaction bolt 43. The sealing bolt 45 is threadedly connected to a second locking nut 46. Preferably, both the first locking nut 44 and the second locking nut 46 are wing nuts, which are convenient for rotation and disassembly.

[0037] A handle 81 is fixedly connected to the top end of the top cover 8, and a sealing gasket 82 is fixedly connected to the top end inside the top cover 8;

[0038] The positioning component 7 includes a reaction plate 71 fixedly connected to the replacement port 3. The reaction plate 71 is provided with a first positioning hole 72 adapted to the reaction bolt 43. The replacement port 3 is fixedly connected with a sealing plate 73 along the axial rotation direction of the inner tube 4, that is, the reaction plate 71 and the sealing plate 73 are fixedly connected to the replacement port 3 along the axial rotation direction of the inner tube 4. A second positioning hole 74 is provided at one side of the bottom of the sealing plate 73 adapted to the sealing bolt 45;

[0039] It should be noted that after the top cover 8 is opened, the adsorbent 6 is placed into the inner tube 4, and then the top cover 8 is installed at the top end of the inner tube 4. After the installation is completed, the top cover 8 seals the outlet of the inner tube 4 by means of the internal sealing gasket 82. The installation method between the top cover 8 and the inner tube 4 includes but is not limited to threaded connection. After sealing, by moving the conversion plate 42 close to the reaction plate 71 or the sealing plate 73 and locking it, the sealing state switching between the inner tube 4 and the outer tube 5 in the purification tank 1 is realized.

[0040] Such as Figure 2 、 Figures 5 to 8 As shown, a bearing 16 is installed inside the replacement port 3. The inner side of the bearing 16 is fixedly connected to the top of the inner tube 4 (see Figure 6 ), that is, the bearing 16 is used to assist the rotation of the inner tube 4. The bottom surface of the outer tube 5 is fixedly connected to the support ring in the purification tank 1. The support ring is used to support the outer tube 5 and is wound around the annular support surface on the inner wall of the purification tank 1 (see Figure 2 ). The arc-shaped partition between the two inner reaction ports 41 of the inner tube 4 is set as the inner sealing plate 47;

[0041] Particularly, the angle between the two sides of the inner sealing plate 47 and the axis of the inner tube 4 is set as angle a, and at the same time, the angle between the two sides of the outer reaction port 51 and the axis of the outer tube 5 is set as angle b. Then angle a is greater than angle b. Since the inner reaction ports 41 and the outer reaction ports 51 are both circumferentially and evenly arranged and the number is the same, in order to ensure that when rotated to the sealed state, the inner sealing plate 47 in the inner tube 4 for sealing the outer reaction port 51 can completely cover the outer reaction port 51, it is necessary to ensure that the covering angle of the inner sealing plate 47 is greater than the opening angle of the outer reaction port 51, and at the same time, the vertical length of the inner sealing plate 47 is greater than the vertical length of the outer reaction port 51, so that effective and comprehensive sealing can be achieved during sealing, that is, the state on the left side in Figure 2 ;

[0042] Further, since the rotation position of the inner tube 4 needs to ensure the stability of the reaction state and the sealing state, and the starting and ending positions of the rotation are restricted by the positioning assembly 7, the angle between the reaction plate 71 and the sealing plate 73 with respect to the axis line of the inner tube 4 is the same as the angle through which the inner sealing plate 47 rotates from the sealing state to the open state. Preferably, the angle between the reaction plate 71 and the sealing plate 73 with respect to the axis line of the inner tube 4 is 45 degrees, so as to adapt to the annular four-opening structure of the inner tube 4 and the outer tube 5;

[0043] The turntable 9 includes a rotating seat 91 fixedly connected to the inner bottom surface of the outer tube 5. A turntable 92 is rotatably connected inside the rotating seat 91, and the top end of the turntable 92 abuts against the bottom surface of the inner tube 4;

[0044] It should be noted that, in order to ensure the sealing effect between the inner tube 4 and the outer tube 5, the outer side wall of the inner tube 4 and the inner side wall of the outer tube 5 are in a fitting state, so as to minimize the gap between the inner and outer side walls when the inner tube 4 and the outer tube 5 are in a closed state. On this basis, in order to ensure the smoothness during rotation, a turntable 9 is provided on the bottom surface of the inner tube 4, and a bearing 16 is also fixedly connected to the top end of the inner tube 4. Then, by means of the rotation of the turntable 9 and the bearing 16, the smoothness of the rotation of the inner tube 4 can be ensured, providing auxiliary help for the realization of the sealing effect.

[0045] Working principle:

[0046] When the adsorbent 6 in the purification tank 1 needs to be replaced, first, the intake air pressure of the intake pipe 13 is reduced by rotating the control valve 14 to reduce the air pressure difference inside and outside the purification tank 1. Subsequently, the locking nut 44 on the replacement plate 42 that fits with the reaction plate 71 is unscrewed. Before unscrewing, the openings of the inner reaction port 41 of the inner tube 4 and the outer reaction port 51 of the outer tube 5 in the purification tank 1 are in the same position, that is, at this time, the adsorbent 6 installed in the inner tube 4 is in a connected reaction state with the nitrogen in the tank, as shown in Figure 2 at the right side of the inner tube 4;

[0047] After unscrewing, turn the handle 81 on the top cover 8. Since the top cover 8 is still installed at the top end of the inner tube 4 through the sealing gasket 82 at this time, that is, the top opening of the top cover 8 is in a sealed state at this time, and the inner tube 4 connected to the top cover 8 is assisted by the bearing 16 and the bottom turntable 9 to rotate. On the basis of the outer side wall fitting with the inner side wall of the outer tube 5, it rotates to the state where the left inner sealing plate 47 closes the outer reaction port 51 of the outer tube 5, as shown in Figure 2 At this time, the nitrogen in the purification tank 1 is temporarily isolated from the adsorbent 6 installed in the inner tube 4 due to the reduced pressure and the influence of the staggered closure of the inner tube 4 and the outer tube 5, and it is also separated from the outside. At the same time, when the inner tube 4 rotates to the closed state of the outer tube 5, the sealing bolt 45 at the top end of the inner tube 4 synchronously rotates to the sealing plate 73, and the locking nut 46 is installed in the positioning hole 74 to complete the locking of this sealing state;

[0048] At this time, open the top cover 8 again, replace the old adsorbent 6 with poor adsorption effect in the inner tube 4, and then close the top cover 8 again. Unlock the second locking nut 46 and rotate the position-changing plate 42 on the inner tube 4 to one side of the reaction plate 71. Once again, lock the reaction bolt 43 and the reaction plate 71 with the first locking nut 44. At the same time, the inner tube 4 in the purification tank 1 returns to the reaction state again. During the process of replacing the adsorbent 6, it is not necessary to open the purification tank 1, and at the same time, the situation of the gas in the tank communicating with the outside during the replacement of the adsorbent 6 is avoided, effectively improving the replacement efficiency and sealing effect when replacing the consumables in the purification tank 1.

[0049] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A nitrogen purification device, comprising a purification tank (1), wherein a sealing cover (2) is installed on the top of the purification tank (1), characterized in that: The sealing cover (2) is provided with a plurality of replacement ports (3) in a ring, the replacement port (3) is rotatably connected to an inner tube (4), a top cover (8) is installed at the top end of the inner tube (4), the inner part of the purification tank (1) is adapted to the inner tube (4) and is fixedly connected to an outer tube (5), an adsorbent (6) is installed inside the inner tube (4), a positioning component (7) is provided on one side of the replacement port (3), and the inner tube (4) and the outer tube (5) are used to cooperate with the positioning component (7) to control the sealing state of nitrogen; The inner tube (4) is evenly provided with a plurality of inner reaction ports (41) along the circumferential side surface, the outer tube (5) is provided with a plurality of outer reaction ports (51) along the circumferential side surface adapted to the inner reaction ports (41), the outer side wall of the inner tube (4) is in contact with the inner side wall of the outer tube (5), and a turntable (9) is provided between the bottom surface of the inner tube (4) and the bottom of the outer tube (5).

2. A nitrogen purification device according to claim 1, characterized in that: A transposition plate (42) is fixedly connected to one side of the top end of the inner tube (4), a reaction plug (43) is fixedly connected to one side of the transposition plate (42), a locking nut (44) is threadedly connected to the reaction plug (43), a sealing plug (45) is fixedly connected to the side of the transposition plate (42) away from the reaction plug (43), a locking nut (46) is threadedly connected to the sealing plug (45), and an inner sealing plate (47) is provided between two adjacent inner reaction ports (41).

3. A nitrogen purification device according to claim 1, characterized in that: A handle (81) is fixedly connected to the top of the top cover (8), and a sealing gasket (82) is installed at the top of the interior of the top cover (8).

4. A nitrogen purification device according to claim 2, characterized in that: The positioning assembly (7) comprises a reaction plate (71) fixedly connected to one side of the component replacement port (3); the reaction plate (71) is adapted to the reaction plug (43) and is provided with a first positioning hole (72); a sealing plate (73) is fixedly connected to one side of the component replacement port (3); a bottom side of the sealing plate (73) is adapted to the sealing plug (45) and is provided with a second positioning hole (74).

5. A nitrogen purification device according to claim 1, characterized in that: A bearing (16) is installed inside the component replacement port (3), and the inner side of the bearing (16) is fixedly connected to the top of the inner tube (4). The turntable (9) includes a rotating seat (91) fixedly connected to the inner bottom surface of the outer tube (5), and a rotating disk (92) is rotatably connected to the top of the rotating seat (91), and the top of the rotating disk (92) abuts against the bottom surface of the inner tube (4).

6. A nitrogen purification device according to claim 2, characterized in that: The angle between the two sides of the inner sealing plate (47) and the axis of the inner tube (4) is greater than the angle between the two sides of the outer reaction port (51) and the axis of the outer tube (5), and the vertical length of the inner sealing plate (47) is greater than the vertical length of the outer reaction port (51).

7. A nitrogen purification device according to claim 4, characterized in that: The angle between the reaction plate (71) and the sealing plate (73) and the axis of the inner tube (4) is equal to the angle between the central vertical plane of the inner reaction port (41) and the central vertical plane of the adjacent inner sealing plate (47).

8. A nitrogen purification device according to claim 1, characterized in that: The outer wall of the inner tube (4) is in contact with the inner wall of the outer tube (5).

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