Multi-stage filtering device for nitrogen generation

Abstract

The utility model relates to the technical field of nitrogen generation, and discloses a multi-stage filtering device for nitrogen generation, which comprises a gas supply pipe, a gas outlet pipe and a moisture filtering structure, the prepared nitrogen is dehumidified by a calcium chloride solution in the moisture filtering structure after entering the moisture filtering structure through a gas feeding pipe, and leaves through a gas outlet pipe; an air valve and a dust filtering structure; the air valves are arranged on the air supply pipe and are arranged on the front side of the dust filtering structure; and the moisture refiltering structure is arranged on the air outlet pipe. Compared with the prior art, the device has the advantages that the calcium chloride solution filter barrel is additionally arranged in front of the lime filter plate, so that moisture for preparing nitrogen can be adsorbed in advance, the dehumidification filter pressure of the lime filter plate is reduced, the replacement period of the lime filter plate is prolonged, and the device is more convenient to use; and the plate type filter and the bag type filter are arranged to perform multi-stage filtration on dust impurities in nitrogen, so that the filtration effect is better, and the nitrogen cleanliness is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen making technical field, specifically point to a kind of multistage filter device for nitrogen making. BACKGROUND

[0002] Nitrogen has important role in industrial production, can improve production efficiency and product quality. For example, in chemical industry, nitrogen is used for gas phase protection and inert atmosphere, prevent oxidation and impurity interference in chemical reaction process, in semiconductor manufacturing, nitrogen is used as inert gas, protects semiconductor chip, ensure high-quality production, in food processing, filling nitrogen can make food and oxygen isolate, improve the shelf life of food.

[0003] But in the existing nitrogen preparation mode, nitrogen prepared contains part water vapor and dust impurities, which greatly affects the purity and cleanliness of nitrogen, and additional filtering of prepared nitrogen is required, and the existing nitrogen filtering is mostly through solid water adsorption material to adsorb the water in the interior, and the adsorption material needs to be replaced frequently in use, which is very troublesome. UTILITARY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to overcome the above technical difficulties, provide a multistage filter device for nitrogen making, which is provided with plate filter and bag filter to carry out multistage efficient filtration on dust impurities of prepared nitrogen, and before lime filter plate, add calcium chloride solution filter barrel to adsorb water of prepared nitrogen in advance, prolong the replacement cycle of lime filter plate.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is:

[0006] A multistage filter device for nitrogen making, comprising:

[0007] Gas supply pipe, gas outlet pipe and moisture filtering structure; prepared nitrogen enters moisture filtering structure through gas supply pipe, is dehumidified by calcium chloride solution in moisture filtering structure, and leaves through gas outlet pipe;

[0008] Gas valve and dust filtering structure; both are arranged on gas supply pipe, and gas valve is arranged on the front side of dust filtering structure;

[0009] Moisture re-filtering structure is arranged on gas outlet pipe.

[0010] As improvement, the moisture filtering structure comprises a filter barrel, a flow diffuser, a sieve plate, a support, a conveying pipe, a dosing pipe and a liquid discharge pipe; the filter barrel is fixed on the support, a gas outlet is arranged at the top center of the filter barrel, a gas inlet is arranged on the top wall at one side of the gas outlet, the conveying pipe is fixed in the filter barrel and connected with the gas inlet at one end and arranged at the bottom of the filter barrel at the other end, the flow diffuser is sleeved and fixed at the pipe opening of the lower end of the conveying pipe, the sieve plate is horizontally arranged and fixed in the filter barrel and filled with molecular sieve above the sieve plate, the dosing pipe is arranged at the top of the side wall of the filter barrel and the liquid discharge pipe is arranged at the bottom of the filter barrel, the dosing pipe and the liquid discharge pipe are respectively provided with valves, and the calcium chloride solution enters the filter barrel through the dosing pipe and leaves the filter barrel through the liquid discharge pipe.

[0011] As improvement, the dust filtering structure comprises a dust removal box, a dust removal box cover, a plate filter and a bag filter; one end of the air supply pipe is connected with the gas inlet of the filter barrel, the dust removal box is arranged on the air supply pipe and opened at one side, two installation grooves are formed on the inner wall of the dust removal box in the circumferential direction, the plate filter and the bag filter are respectively inserted and matched in the corresponding installation grooves, and the plate filter is arranged at the front side of the bag filter, the dust removal box cover is matched with the box opening of the dust removal box, and the dust removal box is closed after the dust removal box cover is closed and fixed on the dust removal box.

[0012] As improvement, the moisture filtering structure comprises a dust removal box, a dust removal box cover, a plate filter and a bag filter; one end of the air supply pipe is connected with the gas inlet of the filter barrel, the dust removal box is arranged on the air supply pipe and opened at one side, two installation grooves are formed on the inner wall of the dust removal box in the circumferential direction, the plate filter and the bag filter are respectively inserted and matched in the corresponding installation grooves, and the plate filter is arranged at the front side of the bag filter, the dust removal box cover is matched with the box opening of the dust removal box, and the dust removal box is closed after the dust removal box cover is closed and fixed on the dust removal box.

[0013] The utility model has the advantages that compared with prior art, the utility model has the advantages that:

[0014] 1、The utility model adds calcium chloride solution filter barrel before lime filter plate, can absorb moisture in advance when preparing nitrogen, reduce the dehumidification filtering pressure of lime filter plate, prolong the replacement cycle of lime filter plate, use more convenient.

[0015] 2、The utility model utilizes calcium chloride solution to absorb moisture in nitrogen, and the contact area of nitrogen and calcium chloride solution is increased through flow diffuser and molecular sieve, and the dehumidification effect is better.

[0016] 3、The utility model is provided with plate filter and bag filter to carry out multistage filtration to dust and impurities in nitrogen, and the filtration effect is better, and the cleanliness of nitrogen is higher. DRAWINGS

[0017] Figure 1 It is the structure schematic diagram of the utility model.

[0018] Figure 2It is a structure schematic view of the water filtering structure of the utility model.

[0019] Figure 3 It is a structure schematic view of the water filtering structure of the utility model.

[0020] Figure 4 It is a structure schematic view of the dust filtering structure of the utility model.

[0021] As shown in the figure: 1, filter barrel;2, air inlet;3, exhaust port;4, air supply pipe;5, air outlet pipe;6, conveying pipe;7, sieve plate;8, dosing pipe;9, liquid discharge pipe;10, diffuser plate;11, dust removal box;12, dust removal box cover;13, plate filter;14, bag filter;15, mounting groove;16, moisture removal box;17, moisture removal box cover;18, lime filter plate;19, air valve;20, support. Specific implementation

[0022] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In addition, the term "includes" and any variation thereof is intended to cover non-exclusive inclusion.

[0023] The utility model will be further described in detail below in combination with the drawings.

[0024] A kind of multi-stage filtering device for nitrogen making, as Figure 1 Shown, including air supply pipe 4, air outlet pipe 5, water filtering structure, water filtering structure again, air valve 19 and dust filtering structure, and air supply pipe 4 and air outlet pipe 5 are connected with water filtering structure respectively (air supply pipe 4 is connected with nitrogen making equipment, and air outlet pipe 5 is connected with nitrogen storage tank, through compressor, air supply fan and the like equipment, nitrogen making equipment end is high pressure area, and nitrogen storage tank is negative pressure area), air valve 19 and dust filtering structure are respectively arranged on air supply pipe 4, water filtering structure again is arranged on air outlet pipe 5.

[0025] Water filtering structure as Figure 2As shown, including filter bucket 1, dosing pipe 8, drain pipe 9, support 20, flow plate 10, sieve plate 7 and conveying pipe 6; filter bucket 1 is a vertical arrangement of stainless steel bucket body (anti-corrosion coating is provided on the inner wall of filter bucket 1), the bottom of which is connected and fixed with support 20, and is stably supported on the ground through support 20, the top center of which is provided with exhaust port 3, and exhaust port 3 is connected with gas outlet pipe 5, air inlet 2 is provided on the top wall on one side of exhaust port 3, and is connected with gas inlet pipe 4, conveying pipe 6 is an L-shaped pipe fixed in filter bucket 1, one end of which is connected with air inlet 2, the other end of which is arranged at the bottom of filter bucket 1, and one flow plate 10 is sleeved and fixed at the pipe opening of the lower end of conveying pipe 6 (such as Figure 2 As shown, nitrogen enters filter bucket 1 through the bottom end of conveying pipe 6, and is scattered into small bubble groups by flow plate 10), dosing pipe 8 is arranged at the top of the side wall of filter bucket 1, and drain pipe 9 is arranged at the bottom of filter bucket 1, dosing pipe 8 and drain pipe 9 are respectively provided with valves (both valves are solenoid valves), and calcium chloride solution enters filter bucket 1 through dosing pipe 8 and leaves filter bucket 1 through drain pipe 9 (for supplement, replacement and recovery of calcium chloride solution in filter bucket 1), sieve plate 7 is horizontally arranged and fixed in filter bucket 1, and the upper part of sieve plate 7 is filled with molecular sieve (calcium chloride solution is above the molecular sieve).

[0026] The dust filtering structure is as shown in Figure 4 As shown, including dust removal box 11, dust removal box cover 12, plate filter 13 and bag filter 14; one end of gas inlet pipe 4 is connected with filter bucket 1 air inlet 2, dust removal box 11 is open on one side and arranged on gas inlet pipe 4, two installation grooves 15 are formed on the inner wall in the circumferential direction, plate filter 13 and bag filter 14 are respectively inserted and matched in the corresponding installation grooves 15, and plate filter 13 is arranged in front of bag filter 14 (the filtering diameter of bag filter 14 is smaller than that of plate filter 13, and the filtering precision is higher), dust removal box cover 12 is matched with the box opening of dust removal box 11, and after dust removal box cover 12 is closed and fixed on dust removal box 11, dust removal box 11 is closed; air valve 19 is arranged on the front side of dust removal box 11 (convenient for closing the input of nitrogen when replacing each filter).

[0027] The water re-filtering structure is as shown in Figure 3 As shown, including moisture removal box 16, moisture removal box cover 17 and lime filter plate 18; one end of gas outlet pipe 5 is connected with filter bucket 1 exhaust port 3, moisture removal box 16 is open on one side and arranged on gas outlet pipe 5, installation grooves 15 are formed on the inner wall in the circumferential direction, and three installation grooves 15 are evenly arranged on the left and right, and three lime filter plates 18 are inserted and matched in the corresponding installation grooves 15, moisture removal box cover 17 is matched with the box opening of dust removal box 11, and after moisture removal box cover 17 is closed and fixed on moisture removal box 16, moisture removal box 16 is closed.

[0028] In the specific implementation of the embodiment:

[0029] Open the valve of the dosing pipe 8, inject calcium chloride solution into the filter barrel 1, when the calcium chloride solution is above the molecular sieve layer, close the valve of the dosing pipe 8 to stop dosing, open the gas valve 19, and the prepared nitrogen gas enters the dust removal box 11, sequentially passes through the plate filter 13 and the bag filter 14, and after filtering the dust impurities in the gas, is transported to the bottom of the filter barrel 1 through the gas conveying pipe 4 and the conveying pipe 6, and is scattered into small bubble groups by the flow distribution plate 10, under the action of the buoyancy, the bubble groups move upwards and pass through the molecular sieve layer above the sieve plate 7 and are scattered again, in the whole process, the water vapor in the nitrogen bubble groups is absorbed by the calcium chloride solution, and after the nitrogen gas leaves the calcium chloride solution, the moisture is reduced by filtering and enters the gas outlet pipe 5 through the top exhaust port 3 of the filter barrel 1, and after reaching the moisture removal box 16, contacts the lime filter plate 18 inside to perform moisture removal filtering again, further reduces the moisture content in the gas, and finally enters the nitrogen storage tank through the gas outlet pipe 5 to be collected and stored. At the same time, according to the specific situation, the dosing pipe 8 and the liquid discharge pipe 9 are opened to replace the calcium chloride solution in the filter barrel 1, and the recovered calcium chloride solution can be repeatedly used after treatment.

[0030] When the plate filter 13 and the bag filter 14 need to be replaced, a breathing machine is worn (to avoid nitrogen asphyxiation), the gas valve 19 is closed, the dust removal box cover 12 is opened, the old plate filter 13 and the bag filter 14 are pulled out, the new plate filter 13 and the bag filter 14 are inserted and matched in the corresponding installation groove 15, the dust removal box cover 12 is closed and fixed, the gas valve 19 is opened, and the filtering operation is continued.

[0031] When the lime filter plate 18 needs to be replaced, a breathing machine is worn (to avoid nitrogen asphyxiation), the gas valve 19 is closed, the moisture removal box cover 17 is opened, the original lime filter plate 18 is pulled out, the new lime filter plate 18 is inserted and matched in the corresponding installation groove 15, the moisture removal box cover 17 is closed and fixed, the gas valve 19 is opened, and the filtering operation is continued, and the original lime filter plate 18 can be repeatedly used after drying.

[0032] The above describes the utility model and its implementation mode, which is not limited, and the embodiment shown in the drawings is only one of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A multi-stage filtering device for producing nitrogen, characterized by, It includes: Air pipe (4), air pipe (5) and moisture filtering structure; The prepared nitrogen enters the moisture filtering structure through the air pipe (4), is dehumidified by the calcium chloride solution in the moisture filtering structure, and exits through the air pipe (5); Air valve (19) and dust filtering structure; Both are arranged on the air pipe (4), and the air valve (19) is arranged on the front side of the dust filtering structure; Moisture filtering structure, arranged on the air pipe (5).

2. The multi-stage filtering device for producing nitrogen according to claim 1, characterized in that: The moisture filtering structure includes filter barrel (1), support (20) and conveying pipe (6); The filter barrel (1) is fixed on the support (20), and the top center of the filter barrel (1) is provided with an exhaust port (3), an air inlet (2) is arranged on the top wall on one side of the exhaust port (3), the conveying pipe (6) is fixed in the filter barrel (1), one end of the conveying pipe (6) is connected with the air inlet (2), and the other end of the conveying pipe (6) is arranged at the bottom of the filter barrel (1).

3. The multi-stage filtering device for producing nitrogen according to claim 2, characterized in that: It also includes dosing pipe (8) and liquid discharge pipe (9); The dosing pipe (8) is arranged on the top of the side wall of the filter barrel (1), and the liquid discharge pipe (9) is arranged at the bottom of the filter barrel (1), the dosing pipe (8) and the liquid discharge pipe (9) are respectively provided with valves, and the calcium chloride solution enters the filter barrel (1) through the dosing pipe (8) and exits the filter barrel (1) through the liquid discharge pipe (9).

4. The multi-stage filtering device for producing nitrogen according to claim 3, characterized in that: It also includes flow distribution plate (10) and sieve plate (7); The flow distribution plate (10) is sleeved and fixed on the pipe opening at the lower end of the conveying pipe (6), the sieve plate (7) is horizontally arranged and fixed in the filter barrel (1), and the sieve plate (7) is filled with molecular sieve above.

5. The multi-stage filtering device for producing nitrogen according to claim 2, characterized in that: The dust filtering structure includes dust removal box (11), dust removal box cover (12), plate filter (13) and bag filter (14); One end of the air pipe (4) is connected with the air inlet (2) of the filter barrel (1), one side of the dust removal box (11) is open, and the dust removal box (11) is arranged on the air pipe (4), the inner wall of the dust removal box (11) is formed with two installation grooves (15) in the circumferential direction, the plate filter (13) and the bag filter (14) are respectively inserted and matched in the corresponding installation grooves (15), and the plate filter (13) is arranged on the front side of the bag filter (14), after the dust removal box cover (12) is covered and fixed on the dust removal box (11), the dust removal box (11) is closed.

6. The multi-stage filtering device for producing nitrogen according to claim 2, characterized in that: The moisture filtering structure includes moisture removal box (16), moisture removal box cover (17) and lime filter plate (18); One end of the air pipe (5) is connected with the exhaust port (3) of the filter barrel (1), one side of the moisture removal box (16) is open, and the moisture removal box (16) is arranged on the air pipe (5), the inner wall of the moisture removal box (16) is formed with installation grooves (15) in the circumferential direction, and a plurality of installation grooves (15) are evenly arranged along the left and right, a plurality of lime filter plates (18) are inserted and matched in the corresponding installation grooves (15), after the moisture removal box cover (17) is covered and fixed on the moisture removal box (16), the moisture removal box (16) is closed.

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