Eluent generator

Abstract

The utility model discloses a kind of eluent generators, including KOH solution liquid storage tank, the bottom of KOH solution liquid storage tank is provided with can structure;The can structure includes upper end plate, pressing plate, middle plate, liquid inlet passage, lower end plate, generating cavity, positive membrane, bipolar membrane, fixed frame, sulfonated net, pure water inlet and eluent outlet.Through being provided with sulfonated net in the top and bottom of the generating cavity of eluent generator, sulfonic acid group of sulfonated net makes it have ion exchange characteristics, improve the combination efficiency of potassium ion and hydroxyl ion in generating cavity, ensure the preparation efficiency and purity of eluent, compared with traditional resin particle, avoid the resistance caused by resin particle broken to liquid flow and the blockage of eluent outlet, improve the efficiency and stability of liquid in generating cavity circulation, reduce the pressure of eluent generator itself, and then reduce equipment maintenance frequency, effectively prolong the service life of eluent generator.

Description

Technical Field

[0001] This utility model relates to the field of ion chromatograph suppressor technology, and in particular to an eluent generator. Background Technology

[0002] The eluent generator is a core component of an ion chromatography system. Utilizing the principles of water electrolysis and ion electromigration, it uses pure water as raw material and precisely controls ion migration by applying current to automatically prepare high-purity eluents (such as KOH, MSA, etc.) online. This replaces the traditional manual preparation process, eliminating errors from manual preparation and environmental interference (such as CO2 pollution), ensuring the purity and concentration consistency of the eluent. In existing technologies, the eluent generator's generating chamber is filled with resin particles, and the sides are fixed with sieve plates. After prolonged use, the resin particles are prone to breakage. Broken resin particles can increase the resistance of the liquid during flow or cause blockage at the eluent outlet, affecting the preparation efficiency and purity of the eluent.

[0003] The technical problem to be solved by this invention is how to design a technology that avoids clogging caused by resin breakage and reduces the pressure of the rinsing liquid generator itself. Utility Model Content

[0004] This invention provides a rinsing fluid generator. By setting sulfonated meshes at the top and bottom of the generating chamber, the sulfonated meshes possess ion exchange properties due to their sulfonic acid groups, thereby improving the binding efficiency of potassium ions and hydroxide ions within the generating chamber. This ensures the efficiency and purity of the rinsing fluid preparation. Compared to traditional resin particles, this avoids the resistance to liquid flow caused by resin particle breakage and the blockage of the rinsing fluid outlet, improving the efficiency and stability of liquid flow within the generating chamber, reducing the pressure of the rinsing fluid generator itself, and thus reducing the frequency of equipment maintenance and effectively extending the service life of the rinsing fluid generator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a rinsing solution generator, including a KOH solution storage tank, the bottom of which is provided with a can head structure; the can head structure includes an upper end plate, a pressure plate, a middle plate, a liquid inlet channel, a lower end plate, a generating chamber, a cation exchange membrane, a bipolar membrane, a fixing frame, a sulfonated mesh, a pure water inlet, and a rinsing solution outlet; the upper end plate is disposed at the bottom of the KOH solution storage tank, and the pressure plate is connected to the bottom of the inner wall of the upper end plate; the outer wall of the pressure plate is provided with liquid inlet channels at equal intervals, and the liquid inlet channels are connected to the KOH solution... The liquid storage tank is connected to the pressure plate. An intermediate plate is connected to the bottom of the outer wall of the pressure plate. A generating chamber is provided on the inner side of the intermediate plate. A cation membrane is provided at the bottom of the pressure plate. A bipolar membrane is provided at the top of the lower end plate. A fixing frame is connected to the side of the pressure plate and the lower end plate that are close to each other. The fixing frame is connected to the intermediate plate. A sulfonated mesh is fixedly connected to the inner side of the fixing frame. A pure water inlet is opened on the side of the intermediate plate located in the generating chamber. A rinsing liquid outlet is opened on the side of the intermediate plate located in the generating chamber away from the pure water inlet.

[0007] Preferably, the upper and lower end plates are provided with an ionization reaction structure; the ionization reaction structure includes an ionization chamber, an anode interface, and a cathode interface; the ionization chamber is located inside the upper end plate and is connected to the KOH solution storage tank and the liquid inlet channel respectively; the upper end plate is provided with an anode interface on one side of the ionization chamber; and the lower end plate is provided with cathode interfaces at equal intervals at the bottom of the bipolar membrane.

[0008] Preferably, the intermediate plate is provided with a transition structure on both sides; the transition structure includes an internal thread interface and a connector; there are two internal thread interfaces, distributed on both sides of the intermediate plate, and connected to the pure water inlet and the rinsing liquid outlet respectively, and the inner wall of the internal thread interface is threaded with a connector.

[0009] Preferably, the bottom of the KOH solution storage tank is provided with a connecting structure; the connecting structure includes a bottle mouth and an internal thread fixing seat; the bottle mouth is located at the bottom of the KOH solution storage tank, the internal thread fixing seat is located at the top of the upper end plate, and the bottle mouth is threadedly connected to the internal thread fixing seat.

[0010] Preferably, the bottom of the KOH solution storage tank is provided with a sealing structure; the sealing structure includes a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring; the first sealing ring is located at the bottom of the bottle mouth and is connected to the bottle mouth and the upper end plate respectively; the second sealing ring is located on the side of the upper end plate and the pressure plate that are close to each other and is connected to the upper end plate and the pressure plate respectively; the third sealing ring is located inside the internal thread interface and is connected to the middle plate and the connector respectively; the fourth sealing ring is located at the bottom of the pressure plate and is connected to the pressure plate, the middle plate, and the fixing frame respectively.

[0011] Preferably, the bottom of the KOH solution storage tank is provided with a fixing structure; the fixing structure includes flanges, fixing holes, fixing bolts and nuts; there are two flanges, distributed on the opposite sides of the upper end plate and the lower end plate; fixing holes are equidistantly opened on the outer walls of the upper end plate, the middle plate, the lower end plate and the flanges; fixing bolts pass through the inner walls of the fixing holes; and nuts are threaded onto the outer walls of the top ends of the fixing bolts.

[0012] Preferably, an exhaust port is provided on one side of the top of the KOH solution storage tank.

[0013] The technical solution of this utility model has the following technical effects compared with the prior art: By setting sulfonated mesh at the top and bottom of the generating chamber of the eluent generator, the sulfonic acid groups of the sulfonated mesh give it ion exchange characteristics, which can improve the binding efficiency of potassium ions and hydroxide ions in the generating chamber, ensuring the preparation efficiency and purity of the eluent. Compared with traditional resin particles, it can avoid the resistance to liquid flow caused by the breakage of resin particles and the blockage of the eluent outlet, which can improve the efficiency and stability of liquid flow in the generating chamber, reduce the pressure of the eluent generator itself, and thus reduce the frequency of equipment maintenance, which helps to extend the service life of the eluent generator. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a rinsing fluid generator according to the present invention;

[0015] Figure 2 This is a schematic diagram of the upper end plate, generating chamber, and lower end plate in a rinsing fluid generator according to the present invention;

[0016] Figure 3 This is a schematic diagram of the intermediate plate, pure water inlet, and connector in a rinsing fluid generator according to the present invention;

[0017] Figure 4 This is a schematic diagram of the appearance of a rinsing fluid generator according to the present invention;

[0018] Figure 5 This is a schematic diagram showing the appearance of the intermediate plate, the eluent outlet, and the connector in the eluent generator of this utility model;

[0019] Figure 6 This is a bottom view of the pressure plate and inlet channel in a rinsing fluid generator according to this utility model;

[0020] Figure 7 for Figure 2 A magnified view of a portion of region A in the middle;

[0021] Figure 8 for Figure 2A magnified view of a portion of region B in the middle.

[0022] Figure reference numerals: 1. KOH solution storage tank; 2. Tank structure; 201. Upper end plate; 202. Pressure plate; 203. Middle plate; 204. Liquid inlet channel; 205. Lower end plate; 206. Generating chamber; 207. Anode membrane; 208. Bipolar membrane; 209. Fixing frame; 210. Sulfonated mesh; 211. Pure water inlet; 212. Eluent outlet; 3. Ionization reaction structure; 301. Ionization chamber; 302. Anode interface; 30 3. Cathode interface; 4. Adapter structure; 401. Internal thread interface; 402. Connector; 5. Connection structure; 501. Bottle mouth; 502. Internal thread fixing seat; 6. Sealing structure; 601. First sealing ring; 602. Second sealing ring; 603. Third sealing ring; 604. Fourth sealing ring; 7. Fixing structure; 701. Flange; 702. Fixing hole; 703. Fixing bolt; 704. Nut; 8. Exhaust port. Detailed Implementation

[0023] like Figures 1-8 As shown, this utility model provides a rinsing solution generator, including a KOH solution storage tank 1, with a can structure 2 at the bottom of the KOH solution storage tank 1; the can structure 2 includes an upper end plate 201, a pressure plate 202, a middle plate 203, a liquid inlet channel 204, a lower end plate 205, a generating chamber 206, a cation exchange membrane 207, a bipolar membrane 208, a fixing frame 209, a sulfonated mesh 210, a pure water inlet 211, and a rinsing solution outlet 212; the upper end plate 201 is disposed at the bottom of the KOH solution storage tank 1, and the pressure plate 202 is connected to the bottom of the inner wall of the upper end plate 201; the outer wall of the pressure plate 202 is provided with liquid inlet channels 204 at equal intervals, and the liquid inlet channels 204 are connected to the KOH solution... The liquid storage tank 1 is connected to the middle plate 203, which is connected to the bottom of the outer wall of the pressure plate 202. The middle plate 203 has a generating chamber 206 on its inner side. The bottom of the pressure plate 202 has a cation membrane 207, and the top of the lower end plate 205 has a bipolar membrane 208. The pressure plate 202 and the lower end plate 205 are connected to a fixing frame 209 on their respective sides. The fixing frame 209 is connected to the middle plate 203. The inner side of the fixing frame 209 is fixedly connected to a sulfonated mesh 210. The middle plate 203 has a pure water inlet 211 on one side of the generating chamber 206, and a rinsing liquid outlet 212 on the side of the middle plate 203 away from the pure water inlet 211.

[0024] In the specific implementation process, it is worth noting that the interior of the KOH solution storage tank 1 is used to store high-concentration KOH solution. Through the cooperation between the KOH solution storage tank 1, the upper end plate 201, the pressure plate 202, the intermediate plate 203, and the liquid inlet channel 204, the KOH solution storage tank 1 is installed on top of the upper end plate 201 and communicates with the internal chamber of the upper end plate 201, allowing the high-concentration KOH solution to enter the internal chamber of the upper end plate 201 for electrolysis. Through the cooperation between the KOH solution storage tank 1, the upper end plate 201, the pressure plate 202, the intermediate plate 203, the liquid inlet channel 204, the generating chamber 206, and the cation exchange membrane 207, the high-concentration KOH solution enters the upper end plate 201. In the internal chamber, an electrolytic reaction occurs under the action of the anode, generating potassium ions, which enter the generating chamber 206 through the liquid inlet channel 204 and the cation membrane 207. Through the coordination of the upper end plate 201, pressure plate 202, middle plate 203, liquid inlet channel 204, lower end plate 205, generating chamber 206, cation membrane 207, bipolar membrane 208, pure water inlet 211 and eluent outlet 212, ultrapure water enters the generating chamber 206 through the pure water inlet 211. Under the action of the cathode at the bottom of the bipolar membrane 208, it is electrolyzed to generate hydroxide ions and hydrogen gas. The hydroxide ions combine with potassium ions in the generating chamber 206 to form a high-purity KOH eluent, which is then transported to the ion chromatograph through the eluent outlet 212. Through the cooperation of the upper end plate 201, pressure plate 202, middle plate 203, liquid inlet channel 204, lower end plate 205, generating chamber 206, cation exchange membrane 207, bipolar membrane 208, fixing frame 209, and sulfonated mesh 210, and by setting sulfonated mesh 210 at the top and bottom of generating chamber 206, the sulfonic acid groups of sulfonated mesh 210 give it ion exchange properties, improving the binding efficiency of potassium ions and hydroxide ions in generating chamber 206, and improving the efficiency and stability of liquid flow in generating chamber 206, reducing the pressure of the eluent generator itself, and thus reducing the impact of pressure fluctuations on the detection results of ion chromatograph. Through the KOH solution storage tank 1, upper end plate 201, pressure plate 202, middle plate 203, liquid inlet channel 204, and lower end plate 205, the system achieves this. 05. The coordination between the generating chamber 206, cation exchange membrane 207, bipolar membrane 208, fixing frame 209, sulfonated mesh 210, pure water inlet 211, and eluent outlet 212, by setting sulfonated mesh 210 at the top and bottom of the generating chamber 206, the sulfonic acid groups of sulfonated mesh 210 give it ion exchange properties, improve the binding efficiency of potassium ions and hydroxide ions in the generating chamber 206, ensure the preparation efficiency and purity of the eluent, and avoid the resistance to liquid flow caused by the breakage of resin particles and the blockage of eluent outlet 212 after the resin particles are broken. This improves the efficiency and stability of liquid flow in the generating chamber 206, reduces the pressure of the eluent generator itself, thereby reducing the frequency of equipment maintenance and effectively extending the service life of the eluent generator.

[0025] Among them, sulfonated mesh 210 is prepared by placing a PP mesh of appropriate size in a four-necked flask, adding 150 ml of 1,2-dichloroethane to the flask, swelling at 50°C for 1 h, then adding 3.3 ml of chlorosulfonic acid at 72°C for sulfonation for 25 min, and then washing it.

[0026] In one feasible embodiment, an ionization reaction structure 3 is provided inside the upper end plate 201 and the lower end plate 205; the ionization reaction structure 3 includes an ionization chamber 301, an anode interface 302 and a cathode interface 303; the ionization chamber 301 is located inside the upper end plate 201 and is connected to the KOH solution storage tank 1 and the liquid inlet channel 204 respectively; the anode interface 302 is provided on one side of the upper end plate 201 located in the ionization chamber 301; and the cathode interfaces 303 are provided at equal intervals at the bottom of the bipolar membrane 208 inside the lower end plate 205.

[0027] In the specific implementation process, it is worth noting that, through the cooperation between the upper end plate 201, the pressure plate 202, the ionization chamber 301, and the anode interface 302, an ionization chamber 301 is formed inside the upper end plate 201 and on top of the pressure plate 202. Furthermore, the ionization chamber 301 is connected to the KOH solution storage tank 1 and the inlet channel 204, respectively. An anode is placed inside the ionization chamber 301 through the anode interface 302. By applying current, the high-concentration KOH solution undergoes an electrolysis reaction within the ionization chamber 301, generating hydrogen ions and oxygen. The hydrogen ions can replenish the potassium ions in the solution, producing the required potassium ions. The liquid enters the generating chamber 206 through the inlet channel 204 and the cation exchange membrane 207 to participate in subsequent reactions. Through the cooperation of the pressure plate 202, lower end plate 205, generating chamber 206, bipolar membrane 208, and cathode interface 303, the cathode is connected to the bottom of the bipolar membrane 208 via the cathode interface 303. When an electric current is applied, ultrapure water flows into the generating chamber 206 through the pure water inlet 211. Under the action of the bipolar membrane 208, it electrolyzes to generate hydroxide ions and hydrogen gas. The hydroxide ions combine with potassium ions in the generating chamber 206 to form a high-purity KOH eluent, which is then discharged through the eluent outlet 212 for use by the ion chromatograph. The system enables automated online preparation of the eluent. The ionization reaction components of the eluent generator are formed by the coordination of the upper end plate 201, pressure plate 202, intermediate plate 203, inlet channel 204, lower end plate 205, generating chamber 206, cation membrane 207, bipolar membrane 208, ionization chamber 301, anode interface 302, and cathode interface 303. This allows the eluent generator to efficiently and stably prepare high-purity KOH eluent. Furthermore, the entire preparation process requires no manual intervention, avoiding errors and environmental interference caused by manual preparation, ensuring the consistency of the eluent's purity and concentration, and thus guaranteeing the detection accuracy of the ion chromatograph. Precision and stability are ensured. Furthermore, by connecting the relay to the anode and cathode of the eluent generator, the relay circuit is disconnected from the anode and cathode during eluent preparation. After the instrument is powered off, the relay circuit is connected to the anode and cathode of the eluent generator, switching the anode and cathode in the eluent generator. This causes potassium ions to move upwards under the influence of the electric field, effectively suppressing potassium ion diffusion. This prevents the concentration of KOH solution in the generating chamber 206 from increasing excessively during prolonged instrument storage, and even avoids crystallization, thus reducing the equilibration time required for instrument use.

[0028] In one feasible embodiment, a transition structure 4 is provided on both sides of the intermediate plate 203; the transition structure 4 includes an internal thread interface 401 and a connector 402; there are two internal thread interfaces 401, distributed on both sides of the intermediate plate 203, and connected to the pure water inlet 211 and the rinsing liquid outlet 212 respectively, and the connector 402 is threadedly connected to the inner wall of the internal thread interface 401.

[0029] In the specific implementation process, it is worth noting that through the cooperation between the intermediate plate 203, the pure water inlet 211, the rinsing liquid outlet 212, the internal thread interface 401, and the connector 402, by screwing the connector 402 into the internal thread interface 401, the liquid flow channel inside the connector 402 is connected to the pure water inlet 211 and the rinsing liquid outlet 212. This facilitates the connection of external pipelines to the pure water inlet 211 and the rinsing liquid outlet 212, ensuring the connection stability between the rinsing liquid generator and external equipment, ensuring the normal flow of ultrapure water and rinsing liquid, and at the same time, facilitating subsequent maintenance and replacement, thus improving the ease of use and practicality of the rinsing liquid generator.

[0030] In one feasible embodiment, a connecting structure 5 is provided at the bottom of the KOH solution storage tank 1; the connecting structure 5 includes a bottle mouth 501 and an internal thread fixing seat 502; the bottle mouth 501 is located at the bottom of the KOH solution storage tank 1, and the internal thread fixing seat 502 is located at the top of the upper end plate 201, and the bottle mouth 501 is threadedly connected to the internal thread fixing seat 502.

[0031] In the specific implementation process, it is worth noting that the stable connection between the KOH solution storage tank 1 and the can head structure 2 is achieved through the cooperation between the KOH solution storage tank 1, the upper end plate 201, the bottle mouth 501 and the internal thread fixing seat 502, ensuring that the KOH solution can flow smoothly into the ionization chamber 301, providing a stable source of raw materials for the subsequent preparation of the rinsing solution. At the same time, it facilitates the disassembly, cleaning and solution replenishment of the KOH solution storage tank 1, improving the ease of equipment maintenance.

[0032] In one feasible embodiment, a sealing structure 6 is provided at the bottom of the KOH solution storage tank 1; the sealing structure 6 includes a first sealing ring 601, a second sealing ring 602, a third sealing ring 603, and a fourth sealing ring 604; the first sealing ring 601 is located at the bottom of the bottle mouth 501 and is connected to both the bottle mouth 501 and the upper end plate 201; the second sealing ring 602 is located on the side of the upper end plate 201 and the pressure plate 202 that are close to each other and is connected to both the upper end plate 201 and the pressure plate 202; the third sealing ring 603 is located inside the internal thread interface 401 and is connected to both the intermediate plate 203 and the connector 402; the fourth sealing ring 604 is located at the bottom of the pressure plate 202 and is connected to both the pressure plate 202, the intermediate plate 203, and the fixing frame 209.

[0033] In the specific implementation process, it is worth noting that, through the cooperation between the upper end plate 201, the bottle mouth 501, and the first sealing ring 601, after the bottle mouth 501 is screwed into the internal thread fixing seat 502 for fixation, the bottle mouth 501 and the first sealing ring 601 abut against each other, achieving a sealing effect between the KOH solution storage tank 1 and the upper end plate 201, preventing KOH solution leakage or contamination, which would affect the preparation of the rinsing solution. Through the cooperation between the upper end plate 201, the pressure plate 202, and the second sealing ring 602, a seal is achieved between the upper end plate 201 and the pressure plate 202, preventing liquid from seeping to the outside through the gap between the upper end plate 201 and the pressure plate 202. Through the intermediate plate 203 and the internal thread interface 4... 01. The fit between connector 402 and third sealing ring 603: After connector 402 is screwed into internal thread interface 401 for fixation, third sealing ring 603 abuts against internal thread interface 401 and connector 402 to prevent leakage of rinsing liquid or pure water during transmission, ensuring stable operation of rinsing liquid generator. Through the fit between pressure plate 202, intermediate plate 203, fixing frame 209 and fourth sealing ring 604, the connection between pressure plate 202, intermediate plate 203 and fixing frame 209 is sealed to prevent liquid leakage from the connection, and at the same time to prevent the solution in KOH solution storage tank 1 from directly entering the generating chamber 206 and affecting the purity of rinsing liquid preparation.

[0034] In one feasible embodiment, a fixing structure 7 is provided at the bottom of the KOH solution storage tank 1; the fixing structure 7 includes a flange 701, fixing holes 702, fixing bolts 703 and nuts 704; there are two flanges 701, distributed on the opposite sides of the upper end plate 201 and the lower end plate 205, and fixing holes 702 are equidistantly provided on the outer walls of the upper end plate 201, the middle plate 203, the lower end plate 205 and the flanges 701, and fixing bolts 703 penetrate through the inner walls of the fixing holes 702, and nuts 704 are threaded onto the outer walls of the top ends of the fixing bolts 703.

[0035] In the specific implementation process, it is worth noting that the assembly and fixation of the upper end plate 201, pressure plate 202, middle plate 203, lower end plate 205, flange 701, fixing hole 702, fixing bolt 703 and nut 704 are achieved by inserting the fixing bolt 703 into the fixing hole 702 and tightening it with the nut 704. This increases the connection stability between the upper end plate 201, pressure plate 202, middle plate 203 and lower end plate 205, ensuring that the can structure 2 will not loosen or fall off during long-term use, thereby ensuring the stability and reliability of the rinsing liquid generator.

[0036] In one feasible embodiment, a vent 8 is provided on one side of the top of the KOH solution storage tank 1.

[0037] In the specific implementation process, it is worth noting that the exhaust port 8 is used to discharge the excess gas generated by the ionization reaction in the KOH solution storage tank 1, to prevent safety hazards caused by excessive internal pressure, thereby maintaining the stability of the tank pressure and improving the safety and reliability of the entire rinsing liquid generator.

[0038] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A rinsing solution generator, comprising a KOH solution storage tank, characterized in that: The bottom of the KOH solution storage tank is equipped with a can structure; The can structure includes an upper end plate, a pressure plate, a middle plate, a liquid inlet channel, a lower end plate, a generating chamber, a cation exchange membrane, a bipolar membrane, a fixing frame, a sulfonated mesh, a pure water inlet, and a rinsing liquid outlet; The upper end plate is located at the bottom of the KOH solution storage tank. A pressure plate is connected to the bottom of the inner wall of the upper end plate. The outer wall of the pressure plate has equidistant liquid inlet channels that communicate with the KOH solution storage tank. An intermediate plate is connected to the bottom of the outer wall of the pressure plate. A generating chamber is located on the inner side of the intermediate plate. A cation exchange membrane is located at the bottom of the pressure plate. A bipolar membrane is located at the top of the lower end plate. A fixing frame is connected to the side of the pressure plate and the lower end plate that are close to each other. The fixing frame is connected to the intermediate plate. A sulfonated mesh is fixedly connected to the inner side of the fixing frame. A pure water inlet is located on the side of the intermediate plate located in the generating chamber. A rinsing liquid outlet is located on the side of the intermediate plate located in the generating chamber that is away from the pure water inlet.

2. The eluent generator according to claim 1, characterized in that: The upper and lower end plates are internally equipped with ionization reaction structures. The ionization reaction structure includes an ionization chamber, an anode interface, and a cathode interface; The ionization chamber is located inside the upper end plate and is connected to the KOH solution storage tank and the inlet channel, respectively. An anode interface is provided on one side of the upper end plate located in the ionization chamber, and cathode interfaces are provided at equal intervals at the bottom of the bipolar membrane inside the lower end plate.

3. The eluent generator according to claim 1, characterized in that: The intermediate plate is provided with a transition structure on both sides; The adapter structure includes an internal threaded interface and a connector; Two internal threaded interfaces are provided, distributed on both sides of the intermediate plate, and respectively connected to the pure water inlet and the rinsing liquid outlet. The inner wall of the internal threaded interface is threaded with a connector.

4. The eluent generator according to claim 1, characterized in that: The bottom of the KOH solution storage tank is provided with a connecting structure; The connection structure includes a bottle mouth and an internally threaded fixing seat; The bottle opening is located at the bottom of the KOH solution storage tank, and the internal thread fixing seat is located at the top of the upper end plate. The bottle opening is threadedly connected to the internal thread fixing seat.

5. The eluent generator according to claim 3, characterized in that: The bottom of the KOH solution storage tank is equipped with a sealing structure; The sealing structure includes a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring; The first sealing ring is located at the bottom of the bottle mouth and is connected to the bottle mouth and the upper end plate. The second sealing ring is located on the side of the upper end plate and the pressure plate that are close to each other and is connected to the upper end plate and the pressure plate. The third sealing ring is located inside the internal thread interface and is connected to the middle plate and the connector. The fourth sealing ring is located at the bottom of the pressure plate and is connected to the pressure plate, the middle plate and the fixing frame.

6. The eluent generator according to claim 1, characterized in that: The bottom of the KOH solution storage tank is equipped with a fixing structure; The fixing structure includes a flange, fixing holes, fixing bolts, and nuts; Two flanges are provided, distributed on the opposite sides of the upper and lower end plates. The outer walls of the upper end plate, middle plate, lower end plate and flanges are all provided with fixing holes at equal intervals. Fixing bolts pass through the inner walls of the fixing holes, and nuts are threaded onto the outer walls of the top ends of the fixing bolts.

7. The eluent generator according to claim 1, characterized in that: An exhaust port is provided on one side of the top of the KOH solution storage tank.

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