Device and method for rapid detection of performance of a bactericide for seawater desalination

Abstract

The present application relates to seawater desalination system equipment technical field, specifically, it relates to the bactericide performance rapid detection device and method for seawater desalination, including flow velocity simulation pipe, the fixed mechanism of setting at its outside, the drive mechanism and injection mechanism of setting in fixed mechanism inside.The bactericide performance rapid detection device and method for seawater desalination, flow velocity simulation pipe connects external water pump to reproduce the fluid shear force and residence time in actual seawater desalination system, injects medicament in dynamic environment through injection mechanism, and cooperates with electromagnetic valve timing collection water sample, so that the bactericide performance data obtained compared with traditional static beaker experiment, more accurate detection medicament in actual seawater desalination pipeline system real effect.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination system equipment technology, and more specifically, to a device and method for rapid testing of the performance of bactericides used in seawater desalination. Background Technology

[0002] During the seawater desalination process, the microorganisms abundant in the raw seawater will grow and form bioscale, which will seriously clog the reverse osmosis membrane and pipelines, leading to a decrease in water production, a surge in energy consumption and damage to equipment. Therefore, it is necessary to add bactericides for control. The core purpose of performance testing is to scientifically evaluate the sterilization efficiency, durability and compatibility with membrane materials of the bactericides. This is a key link to ensure the high efficiency and economy of the desalination plant.

[0003] Patent application CN202221400482.6 discloses a device for testing the bactericidal effect of a disinfectant. The device includes an operating table with a movable rod rotatably mounted on its upper surface. A mounting plate is fixedly connected to the upper end of the movable rod, and a conventional container, a humidifying container, and a heating container are fixedly mounted on the upper surface of the mounting plate. This simple installation structure enables the testing of the bactericidal effect of a disinfectant under different environments, improving the device's applicability and the accuracy of the test results. Its practical effect is excellent and it is worthy of promotion and use in the current market.

[0004] However, existing equipment mainly relies on static beaker tests, which are fundamentally inadequate because they cannot simulate the dynamic conditions unique to the high-pressure pipelines of seawater desalination systems, such as fluid shear force, flow velocity, and residence time of key reagents. This results in a serious disconnect between the obtained bactericide performance data and the actual effects under high-salt, high-speed flow conditions. Consequently, the test results cannot effectively guide the precise selection and dosage control of bactericides in seawater desalination projects. Furthermore, this experiment requires repeated manual injection and sampling of reagents, making the testing process cumbersome, inefficient, prone to human error, and inconsistent in data. The results obtained are difficult to accurately guide production practices.

[0005] In view of this, we propose a rapid testing device and method for the performance of bactericides used in seawater desalination. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for rapid testing of the performance of bactericides used in seawater desalination. The device injects the agent into a dynamic environment through an injection mechanism and collects water samples at regular intervals using a solenoid valve, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A rapid testing device for the performance of bactericides used in seawater desalination includes a flow rate simulation tube, a fixing mechanism located on its outer side, a drive mechanism located inside the fixing mechanism, and an injection mechanism. The driving mechanism includes a motor, a rotating shaft driven by the motor, a rotating cylinder that rotates with the rotating shaft, a circular plate that slides inside the rotating cylinder, several test tubes placed inside the circular plate, and a first electric push rod set above the circular plate. A one-way liquid valve is provided at the mouth of the test tube. After the motor starts, it drives the rotating shaft to rotate the rotating cylinder at a fixed distance. The first electric push rod controls the circular plate to move up and down inside the rotating cylinder to adjust the position of the bottom end of the test tube. The injection mechanism includes a second electric push rod, a rack and piston plate driven by the push rod, an injection tube sleeved on the outside of the piston plate, rod teeth meshing with the rack, and a stirring rod disposed below the rod teeth. The injection tube includes an injection tube body, an inner concave tube disposed therein, and a circular plug that slides inside the inner concave tube. The outer wall of the inner concave tube has several annular grooves. After the bottom of the test tube is pressed down and the circular plug is inserted into the inner concave tube, the second electric push rod drives the rack and piston plate to move to the left, and the bactericide in the test tube is drawn into the injection tube body. When the piston plate moves to the right, the bactericide is injected into the flow rate simulation tube. At the same time, the rack meshes with the rod teeth, driving the stirring rod to mix the bactericide with seawater.

[0008] In the technical solution of the present invention, the flow rate simulation tube includes a mixing tube, an outer pipe fixedly connected to the left and right ends of the mixing tube by bolts, a sampling tube with a flange connected to the bottom surface of the right outer pipe, and a solenoid valve with a flange connected to the outside of the sampling tube.

[0009] In the technical solution of the present invention, the fixing mechanism includes a support frame welded to the outside of the mixing pipe, a partition plate welded to the inner wall of the support frame, and lifting lugs welded to the outer walls of the left and right ends of the support frame. A through groove is provided on the right side of the support frame.

[0010] In the technical solution of the present invention, the motor is fixedly connected to the top surface of the support frame by bolts, one end of the rotating shaft is coaxially connected to the output shaft of the motor and the other end is rotatably connected to the top surface of the partition, the rotating cylinder is rotatably connected to the top surface of the partition, the test tube is clamped and fixed inside the circular plate, the first electric push rod is fixedly connected to the top surface inside the support frame by screws, and its telescopic rod end is rotatably connected to the inside of the circular plate.

[0011] In the technical solution of the present invention, the driving mechanism further includes a shaft tooth that is snapped and fixed to the bottom end of the rotating shaft and a ring tooth that is snapped and fixed to the outer wall of the rotating cylinder and meshes with the shaft tooth. A plurality of sliding grooves are provided on the inner wall of the rotating cylinder, and an arc-shaped slider that is adapted to the sliding groove is integrally formed on the outer wall of the circular plate.

[0012] In the technical solution of the present invention, the second electric actuator is fixedly connected to the inner wall of the support frame by bolts, and a crossbar is snapped and fixed at the end of the telescopic rod of the second electric actuator. A sliding rod is snapped between the crossbar and the piston plate, and the rack is snapped to the outer wall of the crossbar and slidably connected to the inside of the through groove.

[0013] In the technical solution of the present invention, the injection tube further includes a ring disposed on the inner wall of the injection tube body and an upper convex tube and a lower convex tube integrally formed at the upper and lower ends of the injection tube body. The concave tube is welded to the inside of the upper convex tube, and the bottom end of the lower convex tube extends into the inside of the mixing tube and is provided with a one-way drain valve at its opening.

[0014] In the technical solution of the present invention, the round plug is slidably connected to the inside of the concave tube, and a spring is welded between the inner top surface of the round plug and the bottom surface of the concave tube. The elastic force provided by the spring pushes the round plug to move upward.

[0015] In the technical solution of the present invention, the rod teeth are snapped and fixed to the top end of the central shaft of the stirring rod, and the stirring rod is rotatably connected to the inside of the mixing tube.

[0016] On the other hand, the present invention also provides a rapid testing method for the performance of bactericides used in water desalination, comprising the following steps: S1. First, connect the external pipe to the external water pump through a pipe, and control the flow rate through the water pump to simulate the flow rate of seawater in the pipe, ensuring that it is the same as the flow rate of seawater in the seawater desalination system. S2. Next, the first electric actuator in the control drive mechanism pushes the circular plate down inside the rotating cylinder, inserts the bottom end of the test tube directly above the convex tube into the concave tube, squeezes the circular plug down, and connects the test tube with the internal space of the injection tube through the annular groove. S3. Subsequently, the second electric actuator drives the slide bar and rack to move to the left synchronously through the crossbar. At this time, the piston plate moves to the left in the injection tube body, and after the bactericide in the test tube is drawn into the injection tube body, the second electric actuator controls the crossbar to return to its original position, and injects the bactericide into the mixing tube through the lower convex tube. At the same time, the rack meshes with the rod teeth, driving the stirring rod to rotate and mix the bactericide with the seawater. S4. After that, the first electric push rod pushes the circular plate to reset. After the motor starts, it drives the rotating shaft to rotate. The rotating cylinder is driven to rotate through the meshing of the shaft teeth and the ring teeth, and then the next test tube is moved to the top of the convex tube and then stops. S5. Based on the seawater flow rate, the solenoid valve is activated at regular intervals to draw a quantitative amount of seawater mixed with disinfectant from the sampling tube as a sample for testing. The above operation is repeated to obtain multiple sets of samples in batches.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The device and method for rapid testing of the performance of bactericides for seawater desalination use a flow velocity simulation tube connected to an external water pump to reproduce the fluid shear force and residence time in an actual seawater desalination system. The agent is injected into the system in a dynamic environment through an injection mechanism, and water samples are collected at regular intervals using a solenoid valve. This allows the obtained bactericide performance data to more accurately detect the real effect of the agent in the actual seawater desalination pipeline system compared to traditional static beaker experiments.

[0018] 2. This device and method for rapid testing of the performance of bactericides used in seawater desalination involves a motor-driven rotating drum that rotates at a fixed distance. A first electric actuator controls the raising and lowering of a circular plate, allowing multiple test tubes pre-filled with different concentrations or types of bactericides to be sequentially pressed into an injection tube. A second electric actuator then drives a piston plate to draw in the bactericide and inject it into a flow path. Mixing is enhanced by driving a stirring rod, replacing the cumbersome and inefficient manual injection operation. This not only improves testing efficiency and avoids human error but also ensures the repeatability and consistency of each injection, enabling rapid and batch acquisition of parallel experimental data under different conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the flow velocity simulation tube in this invention; Figure 3 This is a cross-sectional schematic diagram of the fixing mechanism in this invention; Figure 4 This is one of the structural schematic diagrams of the drive mechanism in this invention; Figure 5 This is the second schematic diagram of the drive mechanism in this invention; Figure 6 This is a schematic diagram of the rotating cylinder in this invention; Figure 7 This is a schematic diagram of the circular plate in this invention; Figure 8 This is a cross-sectional schematic diagram of the injection mechanism in this invention; Figure 9 This is a cross-sectional schematic diagram of the injection tube structure in this invention; Explanation of reference numerals in the attached figures: 100. Flow rate simulation tube; 110. Mixing tube; 120. External connecting tube; 130. Sampling tube; 140. Solenoid valve; 200. Fixing mechanism; 210. Support frame; 211. Through groove; 220. Partition plate; 230. Lifting lug; 300. Drive mechanism; 310. Motor; 320. Rotating shaft; 330. Shaft gear; 340. Ring gear; 350. Rotating cylinder; 351. Slide groove; 360. Circular plate; 361. Arc-shaped slider; 370. Test tube; 380. First electric actuator; 400. Injection mechanism; 410. Second electric actuator; 420. Crossbar; 430. Slide bar; 440. Rack; 450. Piston plate; 460. Injection tube; 461. Injection tube body; 462. Ring; 463. Upper convex tube; 464. Lower convex tube; 465. Concave tube; 4650. Ring groove; 466. Circular plug; 467. Spring; 470. Rod teeth; 480. Stirring rod. Detailed Implementation

[0020] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Please see Figure 1 - Figure 2 As shown, this embodiment provides the following technical solution: A rapid testing device for the performance of bactericides used in seawater desalination includes a flow rate simulation tube 100, a fixing mechanism 200 disposed on its outer side, a driving mechanism 300 disposed inside the fixing mechanism 200, and an injection mechanism 400.

[0022] Specifically, the flow rate simulation tube 100 includes a mixing tube 110, an outer pipe 120 fixedly connected to the left and right ends of the mixing tube 110 by bolts, a sampling tube 130 with a flange connected to the bottom of the right outer pipe 120, and a solenoid valve 140 with a flange connected to the outside of the sampling tube 130.

[0023] Furthermore, the mixing tube 110 provides space for mixing seawater and disinfectant, and the outer tube 120 is used to discharge seawater after it enters the mixing tube 110. After the solenoid valve 140 is activated, the seawater mixed with disinfectant can be drawn out from the sampling tube 130 as a test sample. This setting simulates the dynamic injection of disinfectant in a seawater desalination system within the mixing tube 110, making the obtained disinfectant performance data more realistic and effective.

[0024] Please see Figure 1 - Figure 3 As shown, in this embodiment, the fixing mechanism 200 includes a support frame 210 welded to the outside of the mixing pipe 110, a partition plate 220 welded to the inner wall of the support frame 210, and lifting lugs 230 welded to the outer walls of the left and right ends of the support frame 210. A through groove 211 is provided on the right side of the support frame 210. Furthermore, the support frame 210 and the partition 220 are used to provide a fixed area for the drive mechanism 300 and the injection mechanism 400, and the lug 230 is used to fix the support frame 210 to the external bracket. This arrangement, through the through groove 211 on the support frame 210 and the partition 220, ensures that the mixing stage of the bactericide and seawater can proceed smoothly.

[0025] Please see Figure 4 - Figure 7As shown, in this embodiment, the driving mechanism 300 includes a motor 310, a rotating shaft 320 driven by the motor 310, a rotating cylinder 350 that rotates with the rotating shaft 320, a circular plate 360 ​​that slides inside the rotating cylinder 350, a plurality of test tubes 370 placed inside the circular plate 360, and a first electric push rod 380 disposed above the circular plate 360. A one-way liquid valve is provided at the opening of the test tube 370. After the motor 310 is started, it drives the rotating shaft 320 to drive the rotating cylinder 350 to rotate at a fixed distance.

[0026] Specifically, the motor 310 is fixedly connected to the top surface of the support frame 210 by bolts, one end of the rotating shaft 320 is coaxially connected to the output shaft of the motor 310, and the other end is rotatably connected to the top surface of the partition plate 220, the rotating cylinder 350 is rotatably connected to the top surface of the partition plate 220, the test tube 370 is snapped and fixed inside the circular plate 360, and the first electric push rod 380 is fixedly connected to the top surface inside the support frame 210 by screws, and its telescopic rod end is rotatably connected to the inside of the circular plate 360.

[0027] Furthermore, the drive mechanism 300 also includes a shaft tooth 330 that is snapped and fixed to the bottom end of the rotating shaft 320 and a ring tooth 340 that is snapped and fixed to the outer wall of the rotating cylinder 350 and meshes with the shaft tooth 330. A plurality of sliding grooves 351 are provided on the inner wall of the rotating cylinder 350, and an arc-shaped slider 361 that is adapted to the sliding grooves 351 is integrally formed on the outer wall of the circular plate 360 ​​to ensure the stability of the circular plate 360 ​​when it moves.

[0028] Furthermore, after the motor 310 starts, it drives the rotating shaft 320 to rotate, and drives the rotating cylinder 350 to rotate through the meshing of the shaft gear 330 and the ring gear 340. The next test tube 370 is then moved to the top of the upper convex tube 463 and then stopped. The first electric push rod 380 controls the circular plate 360 ​​to move up and down inside the rotating cylinder 350 to adjust the bottom position of the test tube 370. This setting realizes the automatic cyclic switching and precise positioning of multiple test tube bactericides, thereby achieving serialized batch testing.

[0029] Please see Figure 1 - Figure 9 As shown, in this embodiment, the injection mechanism 400 includes a second electric push rod 410, a rack 440 and a piston plate 450 driven by the second electric push rod 410, an injection tube 460 sleeved on the outside of the piston plate 450, a rod tooth 470 meshing with the rack 440, and a stirring rod 480 disposed below the rod tooth 470.

[0030] Specifically, the injection tube 460 includes an injection tube body 461, a concave tube 465 disposed therein, and a round plug 466 sliding in the concave tube 465. The outer wall of the concave tube 465 is provided with several annular grooves 4650. After the bottom end of the test tube 370 presses down to insert the round plug 466 into the concave tube 465, the second electric push rod 410 drives the rack 440 and the piston plate 450 to move to the left, and the bactericide in the test tube 370 is drawn into the injection tube body 461. When the piston plate 450 moves to the right, it injects the bactericide into the flow rate simulation tube 100. At the same time, the rack 440 engages the rod teeth 470, driving the stirring rod 480 to mix the bactericide with seawater.

[0031] Furthermore, the second electric actuator 410 is fixedly connected to the inner wall of the support frame 210 by bolts, and the end of the telescopic rod of the second electric actuator 410 is fixedly connected to a crossbar 420. A slide bar 430 is connected between the crossbar 420 and the piston plate 450, and the rack 440 is connected to the outer wall of the crossbar 420 and slidably connected to the inside of the through groove 211.

[0032] Furthermore, the injection tube 460 also includes a ring 462 disposed on the inner wall of the injection tube body 461, and an upper convex tube 463 and a lower convex tube 464 integrally formed at the upper and lower ends of the injection tube body 461. The concave tube 465 is welded to the inside of the upper convex tube 463, and the bottom end of the lower convex tube 464 extends into the inside of the mixing tube 110 and is provided with a one-way drain valve at its opening.

[0033] Furthermore, the round plug 466 is slidably connected to the inside of the concave tube 465. A spring 467 is welded between the top surface of the round plug 466 and the bottom surface of the concave tube 465. The elastic force provided by the spring 467 pushes the round plug 466 upward to provide conditions for the round plug 466 to reset through the elastic force. The bottom surface of the round plug 466 has a space for the spring 467 to retract.

[0034] Furthermore, the rod tooth 470 is snapped and fixed to the top of the central shaft of the stirring rod 480, and the stirring rod 480 is rotatably connected to the inside of the mixing tube 110.

[0035] Furthermore, the second electric actuator 410 drives the slide bar 430 and rack 440 to move to the left synchronously via the crossbar 420. At this time, the piston plate 450 moves to the left in the injection tube 461, drawing the disinfectant from the test tube 370 into the injection tube 461. Then, the second electric actuator 410 controls the crossbar 420 to return to its original position, injecting the disinfectant into the mixing tube 110 through the lower convex tube 464. Simultaneously, the rack 440 engages the rod teeth 470, driving the stirring rod 480 to rotate and mix the disinfectant with the seawater. This setting replaces the cumbersome and inefficient manual injection operation, improves testing efficiency, avoids human error, and ensures the repeatability and consistency of each injection.

[0036] The present invention provides a rapid testing method for the performance of a bactericide used in seawater desalination, comprising the following steps: S1. First, connect the external pipe 120 to the external water pump through a pipe, and control the flow rate through the water pump to simulate the flow rate of seawater in the pipe 100, so as to ensure that it is the same as the flow rate of seawater in the seawater desalination system. S2. Next, the first electric push rod 380 in the control drive mechanism 300 pushes the circular plate 360 ​​to move down in the rotating cylinder 350, inserts the bottom end of the test tube 370 directly above the upper convex tube 463 into the concave tube 465, squeezes the round plug 466 to move down, and connects the test tube 370 with the internal space of the injection tube body 461 through the annular groove 4650. S3. Subsequently, the second electric actuator 410 drives the slide bar 430 and rack 440 to move to the left synchronously via the crossbar 420. At this time, the piston plate 450 moves to the left in the injection tube 461, drawing the disinfectant in the test tube 370 into the injection tube 461. Then, the second electric actuator 410 controls the crossbar 420 to return to its original position, and injects the disinfectant into the mixing tube 110 through the lower convex tube 464. At the same time, the rack 440 engages the rod teeth 470, driving the stirring rod 480 to rotate and mix the disinfectant with seawater. S4. After that, the first electric push rod 380 pushes the circular plate 360 ​​to reset. After the motor 310 starts, it drives the rotating shaft 320 to rotate. Through the engagement of the shaft tooth 330 with the ring tooth 340, it drives the rotating cylinder 350 to rotate and moves the next test tube 370 to directly above the upper convex tube 463 before stopping. S5. Based on the seawater flow rate, the solenoid valve 140 is activated at regular intervals, and a quantitative amount of seawater mixed with disinfectant is drawn out from the sampling tube 130 as a sample for testing. The above operation is repeated to obtain multiple sets of samples in batches.

[0037] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A rapid testing device for the performance of bactericides used in seawater desalination, characterized in that: It includes a flow rate simulation tube, a fixing mechanism located on its outer side, a drive mechanism located inside the fixing mechanism, and an injection mechanism; The driving mechanism includes a motor, a rotating shaft driven by the motor, a rotating cylinder that rotates with the rotating shaft, a circular plate that slides inside the rotating cylinder, several test tubes placed inside the circular plate, and a first electric push rod set above the circular plate. A one-way liquid valve is provided at the mouth of the test tube. After the motor starts, it drives the rotating shaft to rotate the rotating cylinder at a fixed distance. The first electric push rod controls the circular plate to move up and down inside the rotating cylinder to adjust the position of the bottom end of the test tube. The injection mechanism includes a second electric push rod, a rack and piston plate driven by the push rod, an injection tube sleeved on the outside of the piston plate, rod teeth meshing with the rack, and a stirring rod disposed below the rod teeth. The injection tube includes an injection tube body, an inner concave tube disposed therein, and a round plug that slides in the inner concave tube. The outer wall of the inner concave tube has several annular grooves. After the round plug is inserted into the inner concave tube by pressing down at the bottom of the test tube, the second electric push rod drives the rack and piston plate to move to the left, and the bactericide in the test tube is drawn into the injection tube body. When the piston plate moves to the right, the bactericide is injected into the flow rate simulation tube. At the same time, the rack meshes with the rod teeth, driving the stirring rod to mix the bactericide with seawater. The injection tube also includes a ring disposed on the inner wall of the injection tube body and an upper convex tube and a lower convex tube integrally formed at the upper and lower ends of the injection tube body. The concave tube is welded to the inside of the upper convex tube, and the bottom end of the lower convex tube extends into the inside of the mixing tube and is provided with a one-way drain valve at its opening.

2. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 1, characterized in that: The flow rate simulation tube includes a mixing tube, external pipes fixed to the left and right ends of the mixing tube by bolts, a sampling tube with a flange connected to the bottom of the right external pipe, and a solenoid valve with a flange connected to the outside of the sampling tube.

3. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 2, characterized in that: The fixing mechanism includes a support frame welded to the outside of the mixing pipe, a partition welded to the inner wall of the support frame, and lifting lugs welded to the outer walls of the left and right ends of the support frame. A through groove is provided on the right side of the support frame.

4. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 3, characterized in that: The motor is fixedly connected to the top surface of the support frame by bolts. One end of the rotating shaft is coaxially connected to the output shaft of the motor, and the other end is rotatably connected to the top surface of the partition. The rotating cylinder is rotatably connected to the top surface of the partition. The test tube is clamped and fixed inside the circular plate. The first electric push rod is fixedly connected to the top surface inside the support frame by screws, and its telescopic rod end is rotatably connected to the inside of the circular plate.

5. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 4, characterized in that: The driving mechanism also includes a shaft tooth that is snapped and fixed to the bottom end of the rotating shaft and a ring tooth that is snapped and fixed to the outer wall of the rotating cylinder and meshes with the shaft tooth. The inner wall of the rotating cylinder is provided with several sliding grooves, and the outer wall of the circular plate is integrally formed with an arc-shaped slider that matches the sliding grooves.

6. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 5, characterized in that: The second electric actuator is fixedly connected to the inner wall of the support frame by bolts. A crossbar is snapped and fixed at the end of the telescopic rod of the second electric actuator. A sliding rod is snapped between the crossbar and the piston plate. The rack is snapped onto the outer wall of the crossbar and slidably connected to the inside of the through groove.

7. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 6, characterized in that: The round plug is slidably connected to the inside of the concave tube. A spring is welded between the top surface of the round plug and the bottom surface of the concave tube. The elastic force provided by the spring pushes the round plug to move upward.

8. The rapid testing device for the performance of bactericides used in seawater desalination according to claim 7, characterized in that: The rod teeth are snapped and fixed to the top of the central shaft of the stirring rod, and the stirring rod is rotatably connected to the inside of the mixing tube.

9. A rapid testing method for the performance of bactericides used in seawater desalination, and the rapid testing device for the performance of bactericides used in seawater desalination according to claim 8, characterized in that: Includes the following steps: S1. First, connect the external pipe to the external water pump through a pipe, and control the flow rate through the water pump to simulate the flow rate of seawater in the pipe, ensuring that it is the same as the flow rate of seawater in the seawater desalination system. S2. Next, the first electric actuator in the control drive mechanism pushes the circular plate down inside the rotating cylinder, inserts the bottom end of the test tube directly above the convex tube into the concave tube, squeezes the circular plug down, and connects the test tube with the internal space of the injection tube through the annular groove. S3. Subsequently, the second electric actuator drives the slide bar and rack to move to the left synchronously through the crossbar. At this time, the piston plate moves to the left in the injection tube body, and after the bactericide in the test tube is drawn into the injection tube body, the second electric actuator controls the crossbar to return to its original position, and injects the bactericide into the mixing tube through the lower convex tube. At the same time, the rack meshes with the rod teeth, driving the stirring rod to rotate and mix the bactericide with the seawater. S4. After that, the first electric push rod pushes the circular plate to reset. After the motor starts, it drives the rotating shaft to rotate. The rotating cylinder is driven to rotate through the meshing of the shaft teeth and the ring teeth, and then the next test tube is moved to the top of the convex tube and then stops. S5. Based on the seawater flow rate, the solenoid valve is activated at regular intervals to draw a quantitative amount of seawater mixed with disinfectant from the sampling tube as a sample for testing. The above steps are repeated to obtain multiple sets of samples in batches.

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