A nitrogen generator

Abstract

The application discloses a nitrogen generator, comprising a gas supply unit; a pretreatment unit connected with the gas supply unit, used for cooling, removing impurities and removing water from the gas provided by the gas supply unit; three independent branches connected with the pretreatment unit, the branches comprising: a high-purity nitrogen branch used for outputting first-purity nitrogen; a general-purity nitrogen branch used for outputting second-purity nitrogen; and an overflow pressure stabilizing branch used for upper-limit control of the pressure of a total gas path and regulation and control of the flow of the total gas path according to the gas demand of the high-purity nitrogen branch and the general-purity nitrogen branch; wherein the total gas path is the gas path of the gas supply unit. The application integrates PSA and membrane separation two sets of nitrogen production technologies in the same equipment, respectively produces 99.999% ultra-high-purity nitrogen and 95%-99% conventional-purity nitrogen, replaces a traditional two-equipment or combined mode scheme with one equipment, and can meet differentiated gas supply requirements of, for example, mass spectrometer collision gas and ion source.

Description

Technical Field

[0001] This invention belongs to the field of nitrogen production technology, and specifically relates to a nitrogen generator. Background Technology

[0002] The core nitrogen generation technologies of existing integrated nitrogen generators are mainly divided into two types: PSA pressure swing adsorption nitrogen generation technology and membrane fiber separation nitrogen generation technology. However, each of these two technology systems has its own inherent technical defects and cannot simultaneously adapt to the nitrogen supply needs of multiple operating conditions and multiple purities.

[0003] Among them, PSA (Pressure Swing Adsorption) nitrogen generation technology can produce high-purity nitrogen with a purity of up to 99.999%, meeting the requirements for ultra-high purity nitrogen applications. However, this technology suffers from high gas loss and high energy consumption during operation. Membrane fiber separation nitrogen generation technology has the advantages of stable operation, low failure rate, and good continuous gas supply, but its nitrogen purity ceiling can only reach 99.5%, which cannot meet the requirements for ultra-high purity nitrogen applications.

[0004] However, in applications such as analytical laboratories, equipment often needs to be compatible with two different specifications and purities of nitrogen gas supply. Neither the aforementioned PSA pressure swing adsorption (PSA) nitrogen generation technology nor membrane fiber separation nitrogen generation technology can meet these requirements.

[0005] To address this issue, related technologies typically employ two different types of nitrogen generators to supply nitrogen of varying purities, or a membrane fiber separation nitrogen generator paired with a nitrogen cylinder, or a high-flow-rate membrane fiber separation nitrogen generator paired with a split-type PSA device.

[0006] However, all of the above nitrogen generation methods involve the installation of multiple devices, which takes up space and is not well-suited for laboratory settings with limited space. Furthermore, the airflow and pressure of multiple devices working together are difficult to control uniformly, which can easily lead to unstable gas supply and low operating condition matching, greatly affecting the ease of use and stability of gas supply. Summary of the Invention

[0007] The purpose of this invention is to propose a dual-mode nitrogen generator to solve the problems in the prior art.

[0008] Therefore, the present invention provides a nitrogen generator, comprising: Gas supply unit; A pretreatment unit, which is connected to the gas supply unit, is used to cool, remove impurities, and remove water from the gas supplied by the gas supply unit. Three independent branches are connected to the preprocessing unit, and the branches include: A nitrogen purification branch, wherein the nitrogen purification branch is used to produce nitrogen gas of the first purity; A nitrogen-purifying branch, wherein the nitrogen-purifying branch is used to produce nitrogen gas of a second purity; An overflow pressure stabilizing branch is used to control the upper limit of the pressure of the main gas path and to regulate the flow rate of the main gas path according to the gas demand of the refined nitrogen branch and the ordinary nitrogen branch; wherein, the main gas path is the gas path of the gas supply unit.

[0009] In some embodiments, a control system is also included, the control system comprising: The first control circuit board is electrically connected to the gas supply unit and the refined nitrogen branch, and is used for the start-stop regulation of the dual air compressors, the alternating switching of the two molecular sieve towers, and the timing control of the nitrogen production process of the refined nitrogen branch. The second control circuit board is used for main power switch control, automatic drainage sequence control, full pipeline pressure monitoring, real-time monitoring of nitrogen purity in the outlet gas, human-machine interaction operation, and fault warning and alarm. The second control circuit board collects outlet gas purity data in real time through a purity sensor, and automatically switches the gas path from the venting state to the normal outlet gas output state after determining that the nitrogen purity has reached the set standard.

[0010] In some embodiments, a chassis is included, the dimensions of which are 455*600*1090mm; The chassis includes a front circuit area, a left gas source area, and a right purification area; The front circuit area is provided with the first control circuit board and the second control circuit board, as well as electrical components; The lower part of the left gas source area is equipped with a gas supply unit, and the upper part is equipped with a pretreatment unit and an overflow pressure stabilizing branch. The right-side purification zone is equipped with a refined nitrogen branch and a general nitrogen branch, and the right-side purification zone has a square layout.

[0011] In some embodiments, a gas path interface and valve system are arranged at the lower end of the right purification zone.

[0012] In some embodiments, the overflow pressure regulating branch includes an overflow valve, and the overflow valve is configured to open and release pressure when the pressure of the main gas line exceeds a preset threshold.

[0013] In some embodiments, the nitrogen purification branch includes at least a drying membrane and a molecular sieve tower connected to the drying membrane, the molecular sieve tower being used to achieve nitrogen-oxygen separation; The first gas tank is used for pressure stabilization and buffering. A first valve system, connected to the first gas tank, is used to control the pressure of the output nitrogen of the first purity. A first activated carbon filter, connected to the first valve system, is used to remove organic matter or odors from nitrogen of the first purity.

[0014] In some embodiments, the nitrogen-purifying branch includes at least a nitrogen membrane, which is used for nitrogen-oxygen separation and nitrogen purification; The second gas tank is used for pressure stabilization and buffering. The second valve system, which is connected to the second gas tank, is used to control the pressure of the output second purity nitrogen gas; The second activated carbon filter, connected to the second valve system, is used to remove organic matter or odors from the second purity nitrogen gas.

[0015] In some embodiments, the air supply unit includes dual air compressors.

[0016] In some embodiments, the pretreatment unit includes a condenser connected to a three-stage water removal filter module for removing liquid water, impurities, and oil from the compressed air.

[0017] In some embodiments, a heat exchanger is also provided between the pretreatment unit and the three independent branches, and the compressed air after passing through the heat exchanger enters the three independent branches respectively.

[0018] Beneficial effects: 1. This invention integrates two nitrogen generation technologies, PSA and membrane separation, into the same device, producing 99.999% ultra-high purity nitrogen and 95%-99% conventional purity nitrogen respectively. One device replaces the traditional solution of two devices or combinations, which can meet the differentiated gas supply needs of mass spectrometers such as collision gas and ion source.

[0019] 2. This invention highly integrates the dual nitrogen generation system, pretreatment system and electrical control system into a single chassis, eliminating the need for multiple equipment stacking, significantly reducing the laboratory floor space, and reducing equipment procurement, piping and auxiliary materials and multi-point operation and maintenance investment, thereby reducing the total life cycle cost.

[0020] 3. This invention achieves dynamic pressure balance between the two circuits through current shunting and overflow voltage stabilization, eliminating mutual interference from process fluctuations in the two circuits. Furthermore, the use of a dual-circuit board physical isolation architecture separates power process control from monitoring and interactive control, avoiding logic crosstalk and fault linkage inherent in single-board systems, significantly improving the reliability of continuous equipment operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the gas path of the dual-nitrogen-generating-mode nitrogen generator provided by the present invention.

[0023] Figure 2 This is a schematic diagram of one side of the casing of the dual-nitrogen-generating-mode nitrogen generator provided by the present invention.

[0024] Figure 3 This is a schematic diagram of the other side of the casing of the dual-nitrogen-generating-mode nitrogen generator provided by the present invention.

[0025] In the diagram: 1. Air supply unit; 101. Air compressor; 2. Pretreatment unit; 201. Condenser; 202. Heat exchanger; 203. Water droplet filter; 204. Oil mist filter; 3. Nitrogen purification branch; 301. Drying membrane; 302. First throttle valve; 303. First three-way solenoid valve; 304. Molecular sieve tower; 305. Check valve; 306. Micro-mist filter; 307. First air tank; 308. First pressure regulating valve; 309. Second throttle valve; 310. Second... Three-way solenoid valve; 311, First activated carbon filter; 4, General nitrogen branch; 401, Nitrogen membrane; 402, Second gas tank; 403, Second pressure regulating valve; 404, Third throttle valve; 405, Second activated carbon filter; 5, Overflow pressure regulating branch; 501, Overflow valve; 6, Main gas line; 7, First control circuit board; 8, Second control circuit board; 9, Chassis; 901, Front circuit area; 902, Left gas source area; 903, Right purification area; 904, Electrical components. Detailed Implementation

[0026] The invention will be more readily understood by referring to the following detailed description of preferred embodiments and included examples. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of conflict, the definitions in this specification shall prevail.

[0027] like Figures 1-3 As shown, a nitrogen generator includes: Air supply unit 1; specifically, air supply unit 1 is used to provide compressed air.

[0028] Pretreatment unit 2 is connected to gas supply unit 1 and is used to cool, remove impurities and remove water from the gas supplied by gas supply unit 1. Specifically, the pretreatment unit 2 can pre-treat the compressed air supplied by the gas supply unit 1 by cooling, removing impurities and water, which can ensure the purity of the compressed air entering multiple branches, reduce the proportion of impurities in nitrogen, and further improve the purity of nitrogen.

[0029] Three independent branches are connected to preprocessing unit 2. The branches include: Nitrogen purification branch 3 is used to produce nitrogen gas of the highest purity. Nitrogen supply branch 4 is used to produce nitrogen of the second purity. Overflow pressure stabilizing branch 5 is used to control the upper limit of the pressure of the main gas line 6, and to regulate the flow rate of the main gas line 6 according to the gas demand of the refined nitrogen branch 3 and the ordinary nitrogen branch 4; wherein, the main gas line 6 is the gas line of the gas supply unit 1.

[0030] Specifically, two different purities of nitrogen gas can be generated through three independent branches. The refined nitrogen branch 3 can stably output ultra-high purity nitrogen gas (99.999%, i.e., the first purity mentioned above) at a low flow rate, with the low flow rate exemplarily ranging from 10-500 mL / min. The ordinary nitrogen branch 4 can output conventional purity nitrogen gas (95%-99%, i.e., the second purity mentioned above) at a high flow rate, with the high flow rate exemplarily ranging from 2-45 L / min. This application integrates the two nitrogen generation systems into a single chassis 9, greatly reducing the overall size of the equipment and making it suitable for installation in confined laboratory spaces.

[0031] In one example, the chassis dimensions could be 455*600*1090mm. That is, the chassis width is 455mm, the chassis depth is 600mm, and the chassis height is 1090mm, which can reduce the space occupied by the equipment and is more suitable for laboratory scenarios with limited space.

[0032] In addition, the overflow pressure stabilizing branch 5 set in this application controls the upper limit of the intake pressure of the main gas circuit 6 of the entire system by setting an overflow pressure threshold, so that the overall intake pressure is always maintained within a safe and stable preset range. At the same time, it can dynamically adjust the gas supply flow of the main gas circuit 6 according to the real-time gas demand of the fine nitrogen branch 3 and the ordinary nitrogen branch 4, so as to achieve adaptive balance of system pressure and avoid the problem of excessive pressure damaging equipment pipelines or insufficient gas production due to excessive pressure.

[0033] It is understandable that when the gas consumption of the PSA (Pressure Swing Adsorption) high-purity nitrogen production branch, namely the refined nitrogen branch 3 and / or the membrane separation nitrogen production branch, namely the general nitrogen branch 4, increases, the process resistance of the two branches decreases, and the pressure at the splitting node tends to decrease. The splitting node is the node where the refined nitrogen branch 3, the general nitrogen branch 4, and the overflow pressure stabilizing branch 5 are connected to the main gas line 6.

[0034] At this time, the overflow valve 501 in the overflow stabilizing branch 5 senses that the node pressure is lower than the preset opening pressure, automatically reduces the valve opening or closes it completely, so that the discharge of the overflow stabilizing branch 5 approaches zero. The compressed air that should have overflowed from this branch is redistributed to the PSA high-purity nitrogen production branch and the membrane separation nitrogen production branch to supplement the downstream gas consumption increment and prevent the molecular sieve tower 304 adsorption efficiency from decreasing or the membrane separation permeate side pressure from becoming unbalanced due to the low total pressure.

[0035] When the gas consumption of the two downstream nitrogen generation branches decreases or enters a standby pressure-holding state, the pressure at the branch node tends to rise. When the node pressure reaches or exceeds the preset opening pressure of the overflow valve 501, the overflow valve 501 automatically opens to release pressure, directly discharging excess compressed air to the exhaust end. This clamps the pressure at the branch node near the preset opening pressure, forming a hard shut-off at the upper pressure limit. This prevents overpressure in the main line from damaging the sealing structure of the molecular sieve tower 304, the membrane module housing, and pipe joints. Simultaneously, the air compressor 101 enters a phased shutdown. If both air compressors 101 are stopped simultaneously, the rapid changes in current, large changes in airflow, and excessive vibration are detrimental to the system's steady state. Phased shutdown, combined with the overflow valve 501, achieves a soft transition for the entire equipment and gas path.

[0036] Furthermore, the overflow pressure regulating branch 5 includes an overflow valve 501, and the overflow valve 501 is configured to open and release pressure when the pressure of the main gas line 6 exceeds a preset threshold.

[0037] Specifically, when the pressure of the main air passage 6 is detected to reach a preset threshold, it indicates that the pressure of the main air passage 6 is too high and may damage the equipment pipeline and related components in the equipment. At this time, the overflow valve 501 is opened to a certain degree, which can automatically release pressure according to the pressure of the main air passage 6 to avoid damage to the equipment pipeline due to excessive pressure.

[0038] Furthermore, the nitrogen purification branch 3 will be explained as follows: The nitrogen purification branch 3 includes at least a drying membrane 301 and a molecular sieve tower 304 connected to the drying membrane 301. The molecular sieve tower 304 is used to achieve nitrogen-oxygen separation. A first throttling valve 302 and a first three-way solenoid valve 303 are also provided between the drying membrane 301 and the molecular sieve tower 304. The waste gas separated by the drying membrane 301 is led out from the permeate side and discharged through the first throttling valve 302 and the first three-way solenoid valve 303.

[0039] Specifically, the drying membrane 301 allows for deep water removal and preliminary nitrogen purification in the pre-treatment step, protecting the molecular sieve from water vapor poisoning and improving separation efficiency. The molecular sieve tower 304 achieves nitrogen-oxygen separation, producing 99.999% ultra-high purity nitrogen. The molecular sieve tower structure features an outer square shape and an inner circle. The outer square shape facilitates spatial arrangement, while the inner circle utilizes packing material to eliminate dead zones.

[0040] The first gas tank 307 is used for pressure stabilization and buffering. It prevents excessive pressure of the nitrogen gas generated by the molecular sieve tower 304 and ensures a stable gas supply to the user end during the regeneration of the molecular sieve tower, making subsequent flow rate adjustments easier. Preferably, the first gas tank 307 is an aluminum tank. Preferably, the volume of the first gas tank 307 is 2.5L.

[0041] A one-way valve 305 and a micro-mist filter 306 are installed between the molecular sieve tower 304 and the first gas tank 307. The one-way valve 305 prevents downstream gas from flowing back into the molecular sieve tower 304. The micro-mist filter 306 performs fine filtration after the molecular sieve tower 304 to remove trace amounts of dust and mist droplets, thereby improving the purity of nitrogen.

[0042] The first valve system, connected to the first gas tank 307, is used to control the pressure of the output nitrogen of the first purity. This first valve system includes a first pressure regulating valve 308, a second throttle valve 309, and a second three-way solenoid valve 310. The second three-way solenoid valve 310 works in conjunction with a purity sensor, supplying gas only to the user equipment when the purity meets the standard; otherwise, it vents the gas, thus preventing low-purity nitrogen from accidentally entering the user equipment and saving manpower for repeated confirmation and inspection. It should be noted that this configuration is primarily used when the equipment is initially running or when the equipment is operating abnormally.

[0043] Specifically, the process pressure can be adjusted to the output pressure required by the user through the first pressure regulating valve 308, and the output flow rate of the fine nitrogen branch 3 can be limited through the second throttle valve 309 to match the small flow rate gas demand of 10-500 mL / min.

[0044] The first activated carbon filter 311 is connected to the first valve system and is used to remove organic matter or odor from the first purity nitrogen gas and output the finally purified nitrogen gas.

[0045] Furthermore, the following explanation is given for nitrogen-purifying branch 4: The nitrogen supply branch 4 includes at least a nitrogen membrane 401, which is used for nitrogen-oxygen separation and nitrogen purification. The nitrogen membrane 401 separates nitrogen through membrane permeation, allowing nitrogen to be enriched and oxygen to be rapidly permeated out. The second gas tank 402 is used for pressure stabilization and buffering. Specifically, by setting up the second gas tank 402, post-gas storage and pressure stabilization can be achieved after membrane separation. Through the pressure stabilization and buffering of the second gas tank 402, the airflow fluctuations during the membrane separation process can be effectively offset, so that conventional purity nitrogen with a purity range of 95%-99% can be stably output, ensuring that the gas output pressure and purity of the equipment remain stable. It can be adapted to gas usage scenarios with large flow rates and conventional purity, such as mass spectrometry ion sources.

[0046] The second valve system, connected to the second gas tank 402, is used to control the pressure of the output second-purity nitrogen gas. Specifically, the second valve system includes a second pressure regulating valve 403 and a third throttle valve 404. The second pressure regulating valve 403 independently adjusts the output pressure of the membrane separation branch. The third throttle valve 404 controls the output flow rate of the ordinary nitrogen branch 4 to match the gas demand of 2-45 L / min.

[0047] The second activated carbon filter 405 is connected to the second valve system and is used to remove organic matter or odors from the second purity nitrogen gas and output clean nitrogen gas.

[0048] Furthermore, such as Figure 1 and Figure 3 As shown, the air supply unit 1 includes dual air compressors 101.

[0049] Specifically, it includes a first air compressor 101 located in the middle of the casing 9 and a second air compressor 101 located at the bottom of the casing 9. By setting up two air compressors 101, it can be ensured that the air volume of the total air circuit 6 is sufficient to meet the peak air demand of the refined nitrogen branch 3 and the ordinary nitrogen branch 4 at the same time, and avoid the problem of insufficient air supply from a single air compressor 101 leading to system underpressure and reduced air production.

[0050] In addition, when the air consumption at the downstream end suddenly increases, and the pressure of the main air circuit 6 remains below the lower limit of operation after the overflow valve 501 is completely closed, the process control main board can automatically start the second air compressor 101 to replenish air, so that the pressure of the entire air circuit is kept within a relatively stable range.

[0051] Finally, if one of the air compressors 101 fails, the other can continue to operate, thus ensuring redundant air supply.

[0052] Furthermore, such as Figure 1 and Figure 3 As shown, the preprocessing unit 2 will be described as follows: The pretreatment unit 2 includes a condenser 201, which is connected to a three-stage water removal filter module. The filter module is used to remove liquid water, impurities, and oil from the compressed air.

[0053] Specifically, the condenser 201 is used for condensation. The filter module includes a water droplet filter 203 and an oil mist filter 204. The water droplet filter 203 removes liquid water, and the oil mist filter 204 removes impurities such as oil mist.

[0054] Furthermore, a heat exchanger is installed between the pretreatment unit 2 and the three independent branches, and the compressed air after passing through the heat exchanger enters the three independent branches respectively.

[0055] Specifically, the heat exchanger 202 cools down the high-temperature compressed air after it has been compressed by the air compressor 101, so that the compressed air entering the main air passage 6 is at a suitable temperature.

[0056] Furthermore, a solenoid valve is connected to the filter module, which can be used to drain water. Specifically, a solenoid valve is provided below the water droplet filter 203.

[0057] Furthermore, such as Figure 3 As shown, the nitrogen generator also includes a control system, which further includes: The first control circuit board 7 is electrically connected to the gas supply unit 1 and the nitrogen purification branch 3, and is used for the start-stop regulation of the dual air compressor 101, the alternating switching of the two molecular sieve towers 304, and the timing control of the nitrogen production process of the nitrogen purification branch 3. The second control circuit board 8 is used for main power switch control, automatic drainage sequence control, full pipeline pressure monitoring, real-time monitoring of nitrogen purity in the outlet gas, human-machine interaction operation, and fault warning and alarm. The second control circuit board 8 collects the outlet gas purity data in real time through the purity sensor and controls the second three-way solenoid valve 310. After determining that the nitrogen purity has reached the set standard, it automatically switches the gas path from the venting state to the normal outlet gas output state.

[0058] This application achieves physical isolation between the equipment power process control and system monitoring interaction by physically partitioning the first control circuit board 7 and the second control circuit board 8, and by making them independent of each other. Furthermore, their logic is independent, which can fundamentally eliminate mutual interference between control systems and greatly improve the operational stability and intelligence level of the equipment.

[0059] Furthermore, through the cooperation of the first control circuit board 7 and the second control circuit, the nitrogen generator can realize a full set of intelligent functions, including remote start / stop control, real-time pressure / purity data monitoring, custom drainage parameter setting, purity exceeding standard alarm, pressure abnormality alarm, droplet accumulation alarm, equipment over-temperature alarm, SMS remote notification, and operation data storage and traceability viewing.

[0060] Furthermore, a purity monitoring sensor can be installed inside the chassis 9. The high-precision purity sensor collects the purity data of the gas in real time, accurately determining whether the purity of the nitrogen gas meets the set standard. When the purity meets the standard, the system automatically switches the gas path from the venting state to the normal gas output state, eliminating the need for manual supervision and waiting, greatly saving labor time costs, and completely avoiding quality risks such as purity uncertainty and substandard gas supply caused by time estimation.

[0061] Furthermore, such as Figures 2-3 The layout of the internal components of the nitrogen generator is illustrated below: The nitrogen generator includes a chassis 9; The chassis 9 includes a front circuit area 901, a left air source area 902, and a right purification area 903; The front circuit area 901 is provided with a first control circuit board 7 and a second control circuit board 8, as well as electrical components 904; Specifically, the front of the chassis 9 is a dedicated area for the circuitry, where various control circuit boards, such as the first control circuit board 7 and the second control circuit board 8, electrical components 904, and wiring are centrally located. By placing the circuitry-related structures at the front of the chassis 9, they are kept away from vibrating equipment such as the air compressor 101, and from heat-generating equipment such as the heat exchanger 202, creating a quiet, low-temperature, and stable working environment. This effectively avoids the impact of vibration and high temperatures on the precision and lifespan of electrical components. Furthermore, during routine maintenance and repair, it avoids accidental bumps and damage to the circuitry system during the disassembly and assembly of mechanical parts, greatly improving the safety and stability of equipment operation. The lower middle part of the gas source area 902 on the left side is equipped with a gas supply unit 1, and the upper part is equipped with a pretreatment unit 2 and an overflow pressure stabilizing branch 5. Specifically, two air compressors 101 are centrally arranged in the lower part of the area. The air compressors 101 are the main vibration and heat-generating components of the equipment. Placing them in the lower part can lower the overall center of gravity of the equipment, reduce the vibration of the whole machine, and facilitate the rapid dissipation of heat.

[0062] The pretreatment unit 2 and the overflow pressure stabilizing branch 5 are centrally arranged in the upper part of this area. The centralized arrangement of these static components and their physical separation from the vibration equipment below can effectively simplify the pipeline routing, avoid pipeline detours and interference, and improve the transmission efficiency of the gas path.

[0063] The purification zone 903 on the right side is equipped with a nitrogen purification branch 3 and a general nitrogen purification branch 4. The purification zone 903 on the right side has a square layout.

[0064] Specifically, by setting up a square modular layout, the component safety requirements of the fine nitrogen branch 3 and the ordinary nitrogen branch 4 can be adapted.

[0065] This area uniformly adopts aluminum alloy tank structures of the same diameter but different lengths, serving as the molecular sieve tower 304 and the pressure stabilizing gas tank, respectively. The standardized tank structure makes the overall layout neat and compact, maximizing the use of the internal space of the chassis 9 and achieving high-density integration. All gas inlet and outlet interfaces and electromagnetic control valves are uniformly arranged at the lower end of the purification area, achieving centralized arrangement of gas interface and neat and orderly circuit wiring, which facilitates equipment assembly, inspection and maintenance and pipeline maintenance.

[0066] The outermost part of the purification zone 903 on the right side is arranged with membrane separation components such as drying membrane 301 and nitrogen purification membrane, which unifies the gas inlet and exhaust channels of the membrane components, facilitates the centralized discharge of waste gas, and improves the efficiency of membrane separation.

[0067] Furthermore, dedicated heat dissipation holes are opened at the rear of the chassis corresponding to the heat-generating components of the air source, forming a directional heat dissipation air duct to quickly dissipate the heat inside the equipment and avoid high temperature heat accumulation affecting the operation of the equipment; at the same time, the rear integrates a pressure reducing valve, pressure gauge and standard air outlet to uniformly realize equipment pressure regulation, real-time pressure display and nitrogen output, with high structural integration and convenient operation.

[0068] This invention adopts a 9T-type partitioned integrated layout structure for the chassis, which completes the partitioned modular arrangement of the air circuit system and the control system within the limited volume of the chassis. This achieves physical isolation of each functional module and prevents them from interfering with each other, while also taking into account the advantages of equipment heat dissipation, neat wiring, convenient operation and maintenance, and compact structure.

[0069] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nitrogen generator, characterized in that, include: Gas supply unit; A pretreatment unit, which is connected to the gas supply unit, is used to cool, remove impurities, and remove water from the gas supplied by the gas supply unit. Three independent branches are connected to the preprocessing unit, and the branches include: A nitrogen purification branch, wherein the nitrogen purification branch is used to produce nitrogen gas of the first purity; A nitrogen-purifying branch, wherein the nitrogen-purifying branch is used to produce nitrogen gas of a second purity; An overflow pressure stabilizing branch is used to control the upper limit of the pressure of the main gas path and to regulate the flow rate of the main gas path according to the gas demand of the refined nitrogen branch and the ordinary nitrogen branch; wherein, the main gas path is the gas path of the gas supply unit.

2. The nitrogen generator according to claim 1, characterized in that, It also includes a control system, which includes: The first control circuit board is electrically connected to the gas supply unit and the refined nitrogen branch, and is used for the start-stop regulation of the dual air compressors, the alternating switching of the two molecular sieve towers, and the timing control of the nitrogen production process of the refined nitrogen branch. The second control circuit board is used for main power switch control, automatic drainage sequence control, full pipeline pressure monitoring, real-time monitoring of nitrogen purity in the outlet gas, human-machine interaction operation, and fault warning and alarm. The second control circuit board collects outlet gas purity data in real time through a purity sensor, and automatically switches the gas path from the venting state to the normal outlet gas output state after determining that the nitrogen purity has reached the set standard.

3. The nitrogen generator according to claim 2, characterized in that, Includes a chassis, the dimensions of which are 455*600*1090mm; The chassis includes a front circuit area, a left gas source area, and a right purification area; The front circuit area is provided with the first control circuit board and the second control circuit board, as well as electrical components; The lower part of the left gas source area is equipped with a gas supply unit, and the upper part is equipped with a pretreatment unit and an overflow pressure stabilizing branch. The right-side purification zone is equipped with a refined nitrogen branch and a general nitrogen branch, and the right-side purification zone has a square layout.

4. The nitrogen generator according to claim 3, characterized in that, The lower end of the purification zone on the right is equipped with a gas interface and a valve system.

5. The nitrogen generator according to claim 1, characterized in that, The overflow pressure stabilizing branch includes an overflow valve, and the overflow valve is configured to open and release pressure when the pressure of the main gas line exceeds a preset threshold.

6. The nitrogen generator according to claim 1, characterized in that, The nitrogen purification branch includes at least a drying membrane and a molecular sieve tower connected to the drying membrane, the molecular sieve tower being used to achieve nitrogen-oxygen separation; The first gas tank is used for pressure stabilization and buffering. The first valve system, which is connected to the first gas tank, is used to control the pressure of the output nitrogen of the first purity. A first activated carbon filter, connected to the first valve system, is used to remove organic matter or odors from nitrogen of the first purity.

7. The nitrogen generator according to claim 1, characterized in that, The nitrogen-purifying branch includes at least a nitrogen membrane, which is used for nitrogen-oxygen separation and nitrogen purification. The second gas tank is used for pressure stabilization and buffering. The second valve system, which is connected to the second gas tank, is used to control the pressure of the output second purity nitrogen gas; The second activated carbon filter, connected to the second valve system, is used to remove organic matter or odors from the second purity nitrogen gas.

8. The nitrogen generator according to claim 1, characterized in that, The air supply unit includes dual air compressors.

9. The nitrogen generator according to claim 1, characterized in that, The pretreatment unit includes a condenser connected to a three-stage water removal filter module, which is used to remove liquid water, impurities, and oil from the compressed air.

10. The nitrogen generator according to claim 1, characterized in that, A heat exchanger is also provided between the pretreatment unit and the three independent branches, and the compressed air after passing through the heat exchanger enters the three independent branches respectively.

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