Purifying and filtering device for nitrogen preparation

Abstract

According to the purification and filtration device for nitrogen preparation, a filtration cavity is divided into a first filtration channel (a microporous fiber filter element), a second filtration channel (an activated carbon filter element) and a third filtration channel (a molecular sieve filter element), series communication of the three-stage channels is achieved through through holes in partition plates, and a gradient type filtration path is formed. The gas is sequentially subjected to particulate matter interception, organic matter adsorption and moisture removal, the impurity removal efficiency is remarkably improved, and overload of a single filter element is avoided. Meanwhile, the air inlet pipe, the through holes in the two partition plates and the air outlet pipe are arranged in an up-and-down staggered manner, so that the air flowing path is prolonged, uniform distribution of airflow is ensured, turbulence or short circuit phenomena are reduced, and the utilization rate of a filtering medium is improved; in addition, a connecting column at the top of the filter element is matched with a cylindrical mounting groove of the tank cover and adopts a threaded connection structure, so that the filter element is independently mounted and dismounted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas preparation, in particular to a purification filtering device for nitrogen gas preparation. BACKGROUND

[0002] As a key inert gas in the fields of electronic manufacturing, food preservation, medicine and chemical industry, the purity of nitrogen gas directly affects the product quality and process stability. The primary filtering link is crucial to the subsequent fine filtering efficiency in the preparation of high-purity nitrogen gas. The traditional device has technical defects in the primary filtering stage: single microporous fiber filter element causes significant pressure drop due to high structural density and narrow flow channel, which easily leads to excessive local flow rate and impurity accumulation and blockage during high-flow treatment, not only reducing the filtering efficiency, but also shortening the service life of the filter element, and cannot realize gradient interception of impurities of different particle sizes, increasing the subsequent fine filtering load. At the same time, the fixedly installed filter element is prone to form gas turbulence or short circuit due to unreasonable spacing design, resulting in low medium utilization rate, and the filter element needs to be disassembled as a whole during replacement, which is complicated and time-consuming, affecting the production continuity. In addition, the multi-filter element parallel structure in the existing improved scheme lacks flow channel distribution and sealing optimization, leading to uneven gas distribution and local filter element overload failure, and still relies on the traditional fixed mode, which is difficult to realize rapid independent replacement, resulting in high maintenance cost and large efficiency fluctuation. Therefore, there is an urgent need for a primary filtering structure that can balance low resistance and high efficiency filtering, uniform gas distribution and modular maintenance, in order to improve the stability and economy of the nitrogen gas purification system. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies in the prior art, the present application aims to provide a purification filtering device for nitrogen gas preparation to solve the problems raised in the background art.

[0004] According to one aspect of the present application, a purification filtering device for nitrogen gas preparation includes a filter tank body, a tank cover, microporous fiber filter elements, activated carbon filter elements, molecular sieve filter elements, an air inlet pipe, an air outlet pipe and a gas suction pump. The bottom of the filter tank body is a closed end and the top is an open end. An air inlet pipe is fixed on one side of the filter tank body and an air outlet pipe is fixed on the other side. The top open end of the filter tank body is fixedly connected with the tank cover and forms a filter cavity inside. The filter cavity is divided into a first filter channel, a second filter channel and a third filter channel. The first filter channel is connected with the air inlet pipe and the third filter channel is connected with the air outlet pipe. The second filter channel is connected with the first filter channel and the second filter channel respectively. A plurality of microporous fiber filter elements are uniformly arranged in the first filter channel. A plurality of activated carbon filter elements are uniformly arranged in the second filter channel. A plurality of molecular sieve filter elements are uniformly arranged in the third filter channel. The air outlet pipe is fixedly connected with the gas suction pump.

[0005] Preferably, two vertically arranged partition plates are fixedly arranged on the inner side of the bottom of the tank cover at equal distances in the radial direction thereof, and when the tank cover is fixedly connected with the filter tank body, both of the partition plates are inserted into the filter tank body and divide the filter cavity into the first filter passage, the second filter passage and the third filter passage arranged in the axial direction at equal distances in the radial direction. First and second through holes are respectively arranged in the two partition plates, the second filter passage is connected with the first filter passage through the first through hole, and the second filter passage is connected with the third filter passage through the second through hole. A plurality of cylindrical mounting grooves are fixedly arranged on the inner side of the bottom of the tank cover at equal distances in the positions in the first filter passage, the second filter passage and the third filter passage. An inner thread is arranged on the inner side wall of each cylindrical mounting groove. A connecting column is fixedly arranged on the top of each microporous fiber filter core, activated carbon filter core and molecular sieve filter core, and an outer thread is arranged on the outer side wall of each connecting column. The microporous fiber filter core, the activated carbon filter core and the molecular sieve filter core are fixedly arranged on the tank cover through the connecting columns on the top thereof and are threadedly connected with the cylindrical mounting grooves in the first filter passage, the second filter passage and the third filter passage, respectively. The microporous fiber filter core, the activated carbon filter core and the molecular sieve filter core are arranged in the axial direction of the filter tank body.

[0006] Preferably, the inlet pipe, the first through hole, the second through hole and the outlet pipe are arranged in an up-and-down staggered manner.

[0007] Preferably, sealing insertion grooves are arranged on the inner side wall of the filter tank body at positions corresponding to the side edges of the two partition plates. When the tank cover is fixedly connected with the filter tank body, the two partition plates are inserted into the sealing insertion grooves in the filter tank body.

[0008] Preferably, the tank cover and the filter tank body are fixedly connected through flanges and a sealing rubber ring is arranged between the flanges.

[0009] Preferably, a base support is fixedly arranged on the bottom of the filter tank body.

[0010] Preferably, a lifting hanging ring is arranged on the top of the tank cover.

[0011] Compared with the prior art, the nitrogen preparation purification filter device has the advantages that the filter cavity is divided into a first filter channel (a microporous fiber filter core), a second filter channel (an activated carbon filter core) and a third filter channel (a molecular sieve filter core), the three channels are connected in series through the through holes on the partition plate, and a gradient filter path is formed. The gas sequentially passes through particle interception, organic matter adsorption and moisture removal, the impurity removal efficiency is significantly improved, and single filter core overload is avoided. Meanwhile, the upper and lower staggered layout of the gas inlet pipe, the through hole and the gas outlet pipe prolongs the gas flow path, ensures uniform gas distribution, reduces turbulence or short circuit phenomenon, and improves filter medium utilization rate. In addition, the threaded connection structure of the connecting column at the top of the filter core and the cylindrical mounting groove of the tank cover is matched, and the filter core is independently installed and disassembled. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a perspective view of a nitrogen preparation purification filter device according to an embodiment of the present application.

[0013] Figure 2 It is an internal sectional view of a nitrogen preparation purification filter device according to an embodiment of the present application.

[0014] Figure 3 It is a perspective split view of a nitrogen preparation purification filter device according to an embodiment of the present application.

[0015] Figure 4 It is an internal display view of a filter tank body of a nitrogen preparation purification filter device according to an embodiment of the present application.

[0016] Fig. 1 is a filter tank body; 2 is a tank cover; 3 is a microporous fiber filter core; 4 is an activated carbon filter core; 5 is a molecular sieve filter core; 6 is a gas inlet pipe; 7 is a gas outlet pipe; 8 is a gas suction pump; 9 is a first filter channel; 10 is a second filter channel; 11 is a third filter channel; 12 is a partition plate; 13 is a first through hole; 14 is a second through hole; 15 is a cylindrical mounting groove; 16 is a connecting column; 17 is a sealing slot; 18 is a sealing rubber ring; 19 is a base support; 20 is a lifting hanging ring. DETAILED DESCRIPTION

[0017] In order to make the content of the present application easier to be clearly understood, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component. In addition, the terms "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying relative importance. Figure 2 ​

[0018] As Figures 1-4 shown, a kind of nitrogen preparation with purification filter device, including filter tank body 1, tank cover 2, microporous fiber filter core 3, activated carbon filter core 4, molecular sieve filter core 5, air inlet pipe 6, air outlet pipe 7 and air pump 8, filter tank body 1 bottom is closed end and its top is open end, filter tank body 1 bottom is fixedly provided with base support 19, to facilitate placement, filter tank body 1 one side is fixedly provided with air inlet pipe 6 and its other side is fixedly provided with air outlet pipe 7, air outlet pipe 7 is fixedly connected with air pump 8, to provide power for conveying filtered gas, tank cover 2 is fixedly connected with the top open end of filter tank body 1 by flange and is embedded in sealing rubber ring 18 between flange, tank cover 2 top is provided with lifting hanging ring 20, to facilitate hoisting tank cover 2 when replacing filter core, tank cover 2 and filter tank body 1 are connected to form filter cavity inside, air inlet pipe 6 and air outlet pipe 7 are all connected with filter cavity, two vertical separation plates 12 are fixedly provided on tank cover 2 bottom inner side along its radial direction equidistantly, when tank cover 2 is fixedly connected with filter tank body 1, two separation plates 12 are all inserted in filter tank body 1 and filter cavity is equidistantly separated into axially arranged first filter passage 9, second filter passage 10 and third filter passage 11, first through hole 13 and second through hole 14 are respectively formed in two separation plates 12, second filter passage 10 is connected with first filter passage 9 by first through hole 13, second filter passage 10 is connected with third filter passage 11 by second through hole 14, first filter passage 9 is connected with air inlet pipe 6, third filter passage 11 is connected with air outlet pipe 7, second filter passage 10 is connected with first filter passage 9 and second filter passage 10 respectively, in addition, air inlet pipe 6, first through hole 13, second through hole 14 and air outlet pipe 7 are sequentially staggered in position, to prolong gas flow path and improve filter medium utilization rate;Multiple microporous fiber filter cores 3 are evenly provided in first filter passage 9, multiple activated carbon filter cores 4 are evenly provided in second filter passage 10, multiple molecular sieve filter cores 5 are evenly provided in third filter passage 11;Wherein, microporous fiber filter core 3 is mechanically intercepted to dust, oil mist, large particle impurities in gas by its dense porous structure (pore size is usually in the range of 0.1-10 microns), the three-dimensional mesh structure formed by the fiber interlacing can realize gradient filtration to particles of different particle sizes, especially has high efficient interception effect to large particle size suspended matter;Activated carbon filter core 4 depends on its high specific surface area (usually up to 500-1500 m 2 / g) and rich microporous structure, through physical and chemical adsorption, remove organic compounds (such as hydrocarbons, solvent vapor) in the gas, odor molecules (such as hydrogen sulfide, ammonia) and part of the oil vapor; molecular sieve filter core 5 based on its uniform crystal pore size and polar adsorption characteristics, preferentially adsorbs water molecules (H2O) and small molecule impurities (such as carbon dioxide, oxygen) in the gas, its selective adsorption capacity can effectively reduce the water content in nitrogen to ppm level, while also reducing the residual trace gas impurities; in this design, by separating the filter cavity into first filter channel 9 (microporous fiber filter core 3), second filter channel 10 (activated carbon filter core 4) and third filter channel 11 (molecular sieve filter core 5), and using the through holes on the partition plate 12 to realize the series connection of the three channels, a gradient filtering path is formed, and the gas passes through the microporous fiber filter core 3 (intercepting particles), the activated carbon filter core 4 (adsorbing organic matter) and the molecular sieve filter core 5 (removing water and small molecules) in turn, forming a gradient process of step-by-step purification, avoiding single filter core overload operation, at the same time, the inlet pipe 6, the through holes on the two partition plates 12 and the outlet pipe 7 are arranged in turn and staggered, the gas flow path is lengthened, the gas flow is evenly distributed, the turbulence or short circuit phenomenon is reduced, and the utilization rate of the filter medium is improved.

[0019] In one embodiment, in combination Figure 2 and Figure 3 A plurality of cylindrical mounting grooves 15 are uniformly and equidistantly arranged on the inner side of the bottom of the tank cover 2 at positions within the first filter channel 9, the second filter channel 10 and the third filter channel 11. An inner thread is arranged on the inner side wall of each cylindrical mounting groove 15. A connecting column 16 is fixedly arranged on the top of each microporous fiber filter core 3, activated carbon filter core 4 and molecular sieve filter core 5. An outer thread is arranged on the outer side wall of each connecting column 16. The microporous fiber filter core 3, the activated carbon filter core 4 and the molecular sieve filter core 5 are respectively fixedly arranged on the tank cover 2 by thread connection of the connecting columns 16 on the top thereof with the cylindrical mounting grooves 15 within the first filter channel 9, the second filter channel 10 and the third filter channel 11. The microporous fiber filter core 3, the activated carbon filter core 4 and the molecular sieve filter core 5 are arranged in an axial extension manner along the filter tank body 1. In this design, the connecting column 16 on the top of the filter core cooperates with the cylindrical mounting groove 15 of the tank cover 2 to adopt a thread connection structure, realizing independent installation and dismounting of the filter core. When operating, any filter core within any channel can be replaced individually by only opening the tank cover 2, without the need of dismounting the device as a whole, greatly shortening the maintenance time and ensuring the continuity of production. In addition, the axial extension arrangement of the filter core and the uniform and equidistant distribution of the mounting grooves optimize the spacing of the filter cores, reduce the gas pressure drop and prolong the service life of the filter core.

[0020] In one embodiment, in combination Figure 2 and Figure 4Corresponding to the positions of the two partition plates 12 on the inner side wall of the filter tank body 1, a sealing slot 17 is formed, and when the tank cover 2 is fixedly connected with the filter tank body 1, the two partition plates 12 are correspondingly inserted into the sealing slots 17 in the filter tank body 1, and through the plug-in cooperation of the partition plates 12 and the sealing slots 17 in the filter tank body 1, the air-tight isolation between the filter channels is ensured, and the gas channeling is avoided.

[0021] The above examples are only used to illustrate the technical solutions of the embodiments of the present application, and not to limit them. Although the embodiments of the present application are described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that, without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some of the technical features.

Claims

1. A purification filter device for nitrogen production, comprising a filter tank body (1), a tank cover (2), a microporous fiber filter element (3), an activated carbon filter element (4), a molecular sieve filter element (5), an air inlet pipe (6), an air outlet pipe (7), and an air suction pump (8), characterized in that, The filter tank body (1) bottom is closed end and its top is open end, the filter tank body (1) one side is fixedly provided with air inlet pipe (6) and its other side is fixedly provided with air outlet pipe (7), the filter tank body (1) top open end is fixedly connected with tank cover (2) and its inside forms filter cavity, the air inlet pipe (6) and the air outlet pipe (7) are all communicated with the filter cavity, the filter cavity is divided into first filter passage (9), second filter passage (10) and third filter passage (11), the first filter passage (9) is communicated with the air inlet pipe (6), the third filter passage (11) is communicated with the air outlet pipe (7), the second filter passage (10) is respectively communicated with the first filter passage (9) and the second filter passage (10), the first filter passage (9) is uniformly provided with a plurality of microporous fiber filter core (3), the second filter passage (10) is uniformly provided with a plurality of activated carbon filter core (4), the third filter passage (11) is uniformly provided with a plurality of molecular sieve filter core (5), the air outlet pipe (7) is fixedly communicated with air pump (8).

2. The purification filter device for producing nitrogen according to claim 1, wherein The tank cover (2) bottom inner side is fixedly provided with two vertical separation plates (12) along its radial equidistance, when the tank cover (2) is fixedly connected with the filter tank body (1), two the separation plates (12) are all inserted in the filter tank body (1) and the filter cavity is radially equidistantly divided into the first filter passage (9), the second filter passage (10) and the third filter passage (11) arranged in the axial direction, two the separation plates (12) are respectively provided with first through hole (13) and second through hole (14), the second filter passage (10) is communicated with the first filter passage (9) through the first through hole (13), the second filter passage (10) is communicated with the third filter passage (11) through the second through hole (14), the tank cover (2) bottom inner side is uniformly equidistantly fixedly provided with a plurality of cylindrical mounting grooves (15) at the position in the first filter passage (9), the second filter passage (10) and the third filter passage (11), the inner side wall of each cylindrical mounting groove (15) is provided with internal thread, the top of each microporous fiber filter core (3), activated carbon filter core (4) and molecular sieve filter core (5) is fixedly provided with connecting column (16), and the outer side wall of each connecting column (16) is provided with external thread, the microporous fiber filter core (3), activated carbon filter core (4) and molecular sieve filter core (5) are respectively fixed on the tank cover (2) through the connecting column (16) on the top thereof and the cylindrical mounting groove (15) in the first filter passage (9), the second filter passage (10) and the third filter passage (11) correspondingly threadedly connected, the microporous fiber filter core (3), activated carbon filter core (4) and molecular sieve filter core (5) all extend along the axial direction of the filter tank body (1).

3. The purification filter device for producing nitrogen according to claim 2, wherein The air inlet pipe (6), the first through hole (13), the second through hole (14) and the air outlet pipe (7) are arranged in an up-down staggered manner.

4. The purification filter device for producing nitrogen according to claim 2, wherein The filter tank (1) is provided with a sealing slot (17) on the inner side wall corresponding to the side edge position of the two partition plates (12), and when the tank cover (2) is fixedly connected with the filter tank (1), the two partition plates (12) are correspondingly inserted into the sealing slot (17) in the filter tank (1).

5. The purifying and filtering device for producing nitrogen gas according to claim 1, wherein The tank cover (2) and the filter tank (1) are fixedly connected through flanges, and a sealing rubber ring (18) is embedded between the flanges.

6. The purifying and filtering device for producing nitrogen gas according to claim 1, wherein The filter tank (1) is fixedly provided with a base support (19) at the bottom.

7. The purifying and filtering device for producing nitrogen gas according to claim 1, wherein The tank cover (2) is provided with a lifting hanging ring (20) at the top.

Images