Vacuum adsorption nitrogen making machine

Abstract

The utility model discloses a vacuum adsorption nitrogen making machine, and relates to the technical field of nitrogen making machines. The device comprises a bottom plate, one side of the top of the bottom plate is fixedly connected with a first adsorption tower, the other side of the top of the bottom plate is fixedly connected with a second adsorption tower, and flow equalizing assemblies are arranged at the bottoms of inner cavities of the first adsorption tower and the second adsorption tower. Through multi-stage treatment of the pre-filter, the refrigerated dryer and the precision filter, oil mist, water mist, particulate matters and water in compressed air can be effectively removed, air entering the first adsorption tower and the second adsorption tower is ensured to be dry and clean, a foundation is laid for a subsequent adsorption process, impurities are prevented from influencing the adsorption performance of a carbon molecular sieve disc, and the service life of the carbon molecular sieve disc is prolonged. After air enters the adsorption tower, the fan blades drive the flow equalizing disc to rotate, so that airflow uniformly covers the surface of the carbon molecular sieve disc through the vent holes to ensure that the carbon molecular sieve is in full contact with the air, thereby efficiently adsorbing oxygen, moisture, carbon dioxide and other components and improving the nitrogen separation efficiency and purity.

Description

Technical Field

[0001] This utility model belongs to the field of nitrogen generator technology, and in particular relates to a vacuum adsorption nitrogen generator. Background Technology

[0002] A vacuum adsorption nitrogen generator is a device that uses the pressure swing adsorption principle to extract nitrogen from the air. Its working process mainly involves the selective adsorption of oxygen and nitrogen in the air by carbon molecular sieves. Under certain pressure, the adsorption capacity of carbon molecular sieves for oxygen is much greater than that for nitrogen, thereby achieving the separation of oxygen and nitrogen and obtaining high-purity nitrogen.

[0003] In the existing vacuum adsorption nitrogen generator, compressed air is usually introduced directly into the adsorption tower through a simple pipe. This method has obvious defects. Due to the lack of flow equalization function, the compressed air cannot pass through the carbon molecular sieves quickly and over a large area after entering the adsorption tower. As a result, only a portion of the carbon molecular sieves can fully contact the compressed air, while most of the carbon molecular sieves cannot participate in the adsorption process in time. This makes it impossible for oxygen and nitrogen in the compressed air to be quickly and fully adsorbed and separated by the carbon molecular sieves, thus reducing the adsorption and separation rate.

[0004] To address these issues, we offer a vacuum adsorption nitrogen generator. Utility Model Content

[0005] The purpose of this invention is to provide a vacuum adsorption nitrogen generator. By combining a flow equalization component and an air pretreatment component, it solves the problem that existing nitrogen generators do not have a flow equalization function, and that compressed air cannot pass through the carbon molecular sieve quickly and over a large area after entering the adsorption tower, resulting in a low adsorption and separation rate.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a vacuum adsorption nitrogen generator, comprising a base plate, a first adsorption tower fixedly connected to one side of the top of the base plate, and a second adsorption tower fixedly connected to the other side of the top of the base plate. A flow equalization assembly is provided at the bottom of the inner cavities of both the first and second adsorption towers. A carbon molecular sieve disk is fixedly connected to the inner walls of both the first and second adsorption towers. Air pretreatment assemblies are provided on both sides of the top of the base plate. An air compressor is fixedly connected to the top of the base plate, located on one side of the air pretreatment assembly. The flow equalization assembly includes a mounting ring, the surface of which is fixedly connected to the inner wall of the first adsorption tower. Mounting rods are fixedly connected to both sides of the inner cavity of the mounting ring. Mounting blocks are fixedly connected between the mounting rods. A rotating shaft is movably connected to the top of the mounting block. Fan blades are fixedly connected to the edge of the rotating shaft surface. A flow equalization disk is fixedly connected to the top of the rotating shaft via a connecting rod.

[0008] The present invention is further configured such that the air pretreatment component includes a frame, the bottom of the frame is fixedly connected to the top of the base plate, a treatment rack is fixedly connected to one side of the inner cavity of the frame, a pre-filter is provided on one side of the inner cavity of the treatment rack, a refrigerated dryer is connected to one side of the pre-filter through a pipe, a precision filter is connected to one side of the refrigerated dryer through a pipe, and an exhaust pipe is connected to one side of the precision filter. The pre-filter removes trace amounts of oil mist, water mist, and particulate matter from the compressed air. The refrigerated dryer cools the compressed air to the dew point, condenses and discharges most of the liquid water, and the precision filter further removes tiny water droplets, oil droplets, and particulate matter, ensuring that the air entering the first adsorption tower and the second adsorption tower is clean and dry.

[0009] The present invention is further configured such that a limiting ring rail is movably connected to the edge of the flow equalization plate surface, and the surface of the limiting ring rail is fixedly connected to the inner wall of the first adsorption tower and the second adsorption tower respectively. The edge of the flow equalization plate surface is located in the inner cavity of the limiting ring rail, and the limiting effect of the limiting ring rail improves the stability of the flow equalization plate when rotating.

[0010] The present invention is further configured such that the top of the first adsorption tower and the second adsorption tower are provided with nitrogen discharge ports, and the top of the front of the first adsorption tower and the second adsorption tower are provided with oxygen discharge ports. Nitrogen gas that is not absorbed by the carbon molecular sieve disk is discharged through the nitrogen discharge ports. Under low pressure, the partial pressure of oxygen adsorbed on the carbon molecular sieve decreases sharply, and oxygen molecules are forced to desorb and are discharged through the oxygen discharge ports.

[0011] The present invention is further configured such that a pressure equalization pipe is connected to the top of one side of the first adsorption tower, and the end of the pressure equalization pipe away from the first adsorption tower is connected to one side of the second adsorption tower. The pressure equalization valve in the inner cavity of the pressure equalization pipe is open. At this time, the first adsorption tower is at a higher pressure (adsorption pressure), and the second adsorption tower is at a lower pressure (low pressure after regeneration). Part of the nitrogen-rich gas at the top of the first adsorption tower flows to the top of the inner cavity of the second adsorption tower through the pressure equalization pipe, causing the pressure of the first adsorption tower to drop and the pressure of the second adsorption tower to rise until the pressures of the two towers are basically balanced.

[0012] The present invention is further configured such that vacuum pumps are fixedly connected to both sides of the top of the base plate and between the first adsorption tower and the second adsorption tower. The top of the vacuum pump is connected to a vacuum tube. The end of the vacuum tube away from the vacuum pump is connected to one side of the first adsorption tower and the second adsorption tower respectively. During the desorption stage of the first adsorption tower and the second adsorption tower, the vacuum pump draws the pressure inside the tower to a negative pressure, greatly reducing the oxygen partial pressure and forcing the adsorbed oxygen molecules to be strongly desorbed from the molecular sieve pores.

[0013] The present invention is further configured such that a limiting piece is fixedly connected to the bottom of the rotating shaft, the top of the limiting piece contacts the bottom of the mounting block, the limiting piece rotates with the rotating shaft and rotates at the bottom of the mounting block, thereby improving the rotational stability of the rotating shaft through the limiting effect of the limiting piece.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model effectively removes oil mist, water mist, particulate matter, and moisture from compressed air through multi-stage treatment including a pre-filter, a refrigerated dryer, and a precision filter. This ensures that the air entering the first and second adsorption towers is dry and clean, laying the foundation for subsequent adsorption processes and preventing impurities from affecting the adsorption performance of the carbon molecular sieve disk. After the air enters the adsorption tower, the fan blades drive the flow equalization disk to rotate, allowing the airflow to evenly cover the surface of the carbon molecular sieve disk through the vent holes. This ensures that the carbon molecular sieve is in full contact with the air, thereby efficiently adsorbing components such as oxygen, moisture, and carbon dioxide, and improving the efficiency and purity of nitrogen separation.

[0016] 2. This utility model achieves pressure balance between the high-pressure adsorption tower and the low-pressure regeneration tower through an equalizing pipe, allowing nitrogen-rich gas to be introduced from the high-pressure tower into the low-pressure tower, reducing gas waste, lowering the energy consumption of the vacuum pump, and improving the energy utilization efficiency of the nitrogen production process. The vacuum pump evacuates the first and second adsorption towers to a set vacuum level. Under low pressure, the partial pressure of oxygen adsorbed by the carbon molecular sieve disc decreases sharply, promoting rapid desorption and discharge of oxygen, achieving efficient regeneration of the carbon molecular sieve disc, shortening the regeneration time of the first and second adsorption towers, ensuring the continuous and stable operation of the nitrogen generator, and improving the overall nitrogen production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a 3D view of a vacuum adsorption nitrogen generator.

[0019] Figure 2 This is a cross-sectional schematic diagram of the first and second adsorption towers in a vacuum adsorption nitrogen generator.

[0020] Figure 3 For vacuum adsorption nitrogen generator Figure 2 A magnified view of a portion of point A in the middle.

[0021] Figure 4 This is a schematic diagram of the air pretreatment component in a vacuum adsorption nitrogen generator.

[0022] Figure 5 This is a schematic diagram of the flow equalization component in a vacuum adsorption nitrogen generator.

[0023] In the attached diagram: 1. Base plate; 2. First adsorption tower; 3. Second adsorption tower; 4. Flow equalization assembly; 5. Carbon molecular sieve disk; 6. Air pretreatment assembly; 7. Air compressor; 401. Mounting ring; 402. Mounting rod; 403. Mounting block; 404. Rotating shaft; 405. Fan blade; 406. Flow equalization disk; 601. Frame; 602. Treatment rack; 603. Pre-filter; 604. Refrigerated dryer; 605. Precision filter; 606. Exhaust pipe; 8. Nitrogen exhaust port; 9. Oxygen exhaust port; 10. Vacuum pump; 11. Vacuum tube. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 This utility model is a vacuum adsorption nitrogen generator, including a base plate 1. A first adsorption tower 2 is fixedly connected to one side of the top of the base plate 1, and a second adsorption tower 3 is fixedly connected to the other side of the top of the base plate 1. A flow equalization component 4 is provided at the bottom of the inner cavity of both the first adsorption tower 2 and the second adsorption tower 3. A carbon molecular sieve disk 5 is fixedly connected to the inner wall of both the first adsorption tower 2 and the second adsorption tower 3. An air pretreatment component 6 is provided on both sides of the top of the base plate 1. An air compressor 7 is fixedly connected to the top of the base plate 1 and to one side of the air pretreatment component 6. The flow equalization component 4 includes a mounting ring 401. The surface of the mounting ring 401 is fixedly connected to the inner wall of the first adsorption tower 2. Mounting rods 402 are fixedly connected to both sides of the inner cavity of the mounting ring 401. Mounting blocks 403 are fixedly connected between the mounting rods 402. A rotating shaft 404 is movably connected to the top of the mounting block 403. A fan blade 405 is fixedly connected to the edge of the surface of the rotating shaft 404. A flow equalization disk 406 is fixedly connected to the top of the rotating shaft 404 through a connecting rod.

[0027] Specifically: the air pretreatment component 6 treats the air and discharges it to the bottom of the inner cavity of the first adsorption tower 2 and the second adsorption tower 3. Under the action of the airflow, the fan blade 405 starts to rotate, thereby driving the flow equalization disk 406 to rotate. The airflow is evenly discharged to the surface of the carbon molecular sieve disk 5 through the air vents on the surface of the flow equalization disk 406. The airflow evenly covers the surface of the carbon molecular sieve disk 5, enabling the carbon molecular sieve disk 5 to efficiently adsorb oxygen in the airflow. The carbon molecular sieve disk 5 quickly adsorbs oxygen, moisture, carbon dioxide and other components in the air. Since nitrogen molecules are larger or diffuse more slowly, the amount adsorbed is relatively small. The unadsorbed nitrogen is discharged from the top of the first adsorption tower 2 and the second adsorption tower 3.

[0028] Example 2

[0029] Please see Figure 1-5 Based on Embodiment 1, the air pretreatment component 6 includes a frame 601, the bottom of which is fixedly connected to the top of the base plate 1. A treatment rack 602 is fixedly connected to one side of the inner cavity of the frame 601. A pre-filter 603 is provided on one side of the inner cavity of the treatment rack 602. A refrigerated dryer 604 is connected to one side of the pre-filter 603 via a pipe. A precision filter 605 is connected to one side of the refrigerated dryer 604 via a pipe. An exhaust pipe 606 is connected to one side of the precision filter 605. A limiting ring rail is movably connected to the edge of the surface of the flow equalization plate 406. The surface of the limiting ring rail is fixedly connected to the inner wall of the first adsorption tower 2 and the second adsorption tower 3, respectively. Nitrogen vents 8 are provided at the top of both tower 2 and the second adsorption tower 3. Oxygen vents 9 are provided at the top of both the front of the first adsorption tower 2 and the second adsorption tower 3. A pressure equalization pipe is connected to the top of one side of the first adsorption tower 2. The end of the pressure equalization pipe away from the first adsorption tower 2 is connected to one side of the second adsorption tower 3. Vacuum pumps 10 are fixedly connected to both sides of the top of the bottom plate 1 and between the first adsorption tower 2 and the second adsorption tower 3. Vacuum pipes 11 are connected to the top of the vacuum pumps 10. The end of the vacuum pipes 11 away from the vacuum pumps 10 is connected to one side of the first adsorption tower 2 and the second adsorption tower 3 respectively. A limiting plate is fixedly connected to the bottom of the rotating shaft 404. The top of the limiting plate is in contact with the bottom of the mounting block 403.

[0030] Specifically: the pre-filter 603 removes trace amounts of oil mist, water mist, and particulate matter from the compressed air; the refrigerated dryer 604 cools the compressed air to the dew point, condensing and discharging most of the liquid water; the precision filter 605 further removes tiny water droplets, oil droplets, and particulate matter, ensuring that the air entering the first adsorption tower 2 and the second adsorption tower 3 is clean and dry; the edge of the flow equalization plate 406 is located within the inner cavity of the limiting ring rail, and the limiting ring rail improves the stability of the flow equalization plate 406 during rotation; nitrogen gas not absorbed by the carbon molecular sieve plate 5 is discharged through the nitrogen discharge port 8; under low pressure, the partial pressure of oxygen adsorbed on the carbon molecular sieve decreases sharply, and oxygen molecules are forcibly desorbed and discharged through the oxygen discharge port 9. The equalizing valve inside the equalizing pipe is opened. At this time, the first adsorption tower 2 is at a higher adsorption pressure, and the second adsorption tower 3 is at a lower pressure after regeneration. Some of the nitrogen-rich gas at the top of the first adsorption tower 2 flows to the top of the inner cavity of the second adsorption tower 3 through the equalizing pipe, causing the pressure of the first adsorption tower 2 to drop and the pressure of the second adsorption tower 3 to rise until the pressure of the two towers is basically balanced. During the desorption stage of the first adsorption tower 2 and the second adsorption tower 3, the vacuum pump 10 draws the pressure inside the tower to a negative pressure, greatly reducing the oxygen partial pressure and forcing the adsorbed oxygen molecules to strongly desorb from the molecular sieve pores. The limiting plate rotates with the rotating shaft 404 and rotates at the bottom of the mounting block 403. The limiting effect of the limiting plate improves the rotational stability of the rotating shaft 404.

[0031] The working principle of this utility model is as follows: Air compressor 7 is turned on, introducing air. Air pretreatment component 6 and pre-filter 603 remove trace amounts of oil mist, water mist, and particulate matter from the compressed air. Refrigerated dryer 604 cools the compressed air to the dew point, condensing and discharging most of the liquid water. Precision filter 605 further removes tiny water droplets, oil droplets, and particulate matter, ensuring that the air entering the first adsorption tower 2 and the second adsorption tower 3 is clean and dry. After the treated air enters the inner cavity of the first adsorption tower 2 and the second adsorption tower 3, under the action of the airflow, fan blade 405 begins to rotate, thereby driving the flow equalization disk 406 to rotate. The airflow is evenly discharged through the vents on the surface of the flow equalization disk 406 to the surface of the carbon molecular sieve disk 5. The airflow evenly covers the surface of the carbon molecular sieve disk 5, enabling the carbon molecular sieve disk 5 to efficiently adsorb oxygen in the airflow. The carbon molecular sieve disk 5 quickly adsorbs oxygen... The oxygen, moisture, carbon dioxide, and other components in the gas are relatively less adsorbed due to the larger size or slower diffusion of nitrogen molecules. The unadsorbed nitrogen is discharged from the nitrogen discharge port 8 at the top of the first adsorption tower 2 and the second adsorption tower 3. The pressure equalization valve in the pressure equalization pipe is opened. At this time, the first adsorption tower 2 is at a higher adsorption pressure, and the second adsorption tower 3 is at a lower pressure after regeneration. Some of the nitrogen-rich gas at the top of the first adsorption tower 2 flows to the top of the inner cavity of the second adsorption tower 3 through the pressure equalization pipe, causing the pressure of the first adsorption tower 2 to drop and the pressure of the second adsorption tower 3 to rise until the pressures of the two towers are basically balanced. Then, the vacuum pump 10 starts to work, rapidly pumping the pressure in the first adsorption tower 2 from the pressure after equalization to the set vacuum degree. Under the low pressure environment, the partial pressure of oxygen adsorbed on the carbon molecular sieve disk 5 drops sharply, and oxygen molecules are forced to desorb and are discharged through the oxygen discharge port 9.

[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A vacuum adsorption nitrogen generator, comprising a base plate (1), characterized in that: A first adsorption tower (2) is fixedly connected to one side of the top of the base plate (1), and a second adsorption tower (3) is fixedly connected to the other side of the top of the base plate (1). A flow equalization component (4) is provided at the bottom of the inner cavity of the first adsorption tower (2) and the second adsorption tower (3). A carbon molecular sieve disk (5) is fixedly connected to the inner wall of the first adsorption tower (2) and the second adsorption tower (3). An air pretreatment component (6) is provided on both sides of the top of the base plate (1). An air compressor (7) is fixedly connected to the top of the base plate (1) and to one side of the air pretreatment component (6). The flow equalization assembly (4) includes a mounting ring (401), the surface of which is fixedly connected to the inner wall of the first adsorption tower (2). Mounting rods (402) are fixedly connected to both sides of the inner cavity of the mounting ring (401). Mounting blocks (403) are fixedly connected between the mounting rods (402). A rotating shaft (404) is movably connected to the top of the mounting block (403). A fan blade (405) is fixedly connected to the edge of the rotating shaft (404). A flow equalization plate (406) is fixedly connected to the top of the rotating shaft (404) through a connecting rod.

2. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: The air pretreatment assembly (6) includes a frame (601), the bottom of which is fixedly connected to the top of the base plate (1). A treatment rack (602) is fixedly connected to one side of the inner cavity of the frame (601). A pre-filter (603) is provided on one side of the inner cavity of the treatment rack (602). A refrigerated dryer (604) is connected to one side of the pre-filter (603) via a pipe. A precision filter (605) is connected to one side of the refrigerated dryer (604) via a pipe. An exhaust pipe (606) is connected to one side of the precision filter (605).

3. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: The edge of the flow equalization plate (406) is movably connected to a limiting ring rail, and the surface of the limiting ring rail is fixedly connected to the inner wall of the first adsorption tower (2) and the second adsorption tower (3).

4. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: The top of the first adsorption tower (2) and the second adsorption tower (3) are provided with nitrogen discharge ports (8), and the top of the front of the first adsorption tower (2) and the second adsorption tower (3) are provided with oxygen discharge ports (9).

5. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: A pressure equalization pipe is connected to the top of one side of the first adsorption tower (2), and the end of the pressure equalization pipe away from the first adsorption tower (2) is connected to one side of the second adsorption tower (3).

6. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: Vacuum pumps (10) are fixedly connected to both sides of the top of the base plate (1) and between the first adsorption tower (2) and the second adsorption tower (3). A vacuum tube (11) is connected to the top of the vacuum pump (10). The end of the vacuum tube (11) away from the vacuum pump (10) is connected to one side of the first adsorption tower (2) and the second adsorption tower (3).

7. The vacuum adsorption nitrogen generator according to claim 1, characterized in that: A limiting piece is fixedly connected to the bottom of the rotating shaft (404), and the top of the limiting piece contacts the bottom of the mounting block (403).

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