Experimental equipment for chemical reduction of nitrate in seawater

Abstract

The experimental equipment for chemical reduction of nitrate in seawater comprises a reaction bottle, a first feeding mechanism, a second feeding mechanism and a sealed opening and closing mechanism, the sealed opening and closing mechanism comprises an opening and closing driving part and a metal ball, and the metal ball is in transmission connection with the opening and closing driving part; the metal ball can be driven by the opening and closing driving part to push the flat-opening pipe body to at least partially extend into the lower discharging pipe, and the metal ball pushes the sealing part on the sealing ring gasket to abut against and be limited to the telescopic sleeve, so that a containing cavity is defined by the telescopic sleeve, the flat-opening pipe body, the metal ball and the sealing ring gasket; when the sealing ring gasket abuts against the metal ball body and the telescopic sleeve in a sealed mode, the telescopic sleeve can provide damping force for the plain-end pipe body so that the plain-end pipe body can abut against the metal ball body for limiting, and zinc-cadmium particles can be prevented from entering the containing cavity. Therefore, the reaction bottle can be reliably blocked for multiple times, and the problem of leakage caused by accumulation of zinc and cadmium particles can be prevented.

Description

Technical Field

[0001] The invention belongs to the technical field related to experimental equipment, and in particular relates to experimental equipment for chemical reduction of nitrate in seawater. Background Art

[0002] Chemical reduction of nitrate (NO⁻) in seawater refers to the chemical conversion of nitrate into nitrogen (N₂) or other low-oxidation nitrogen compounds (such as NO⁻ and NH⁺). This process is of great significance in environmental remediation (e.g., eutrophication control) and industrial wastewater treatment. In marine environmental monitoring, the zinc-cadmium reduction method is widely used by grassroots monitoring units due to its simplicity, rapidity, and suitability for on-site analysis at sea.

[0003] In the experimental equipment related to zinc-cadmium reduction, it is necessary to add a certain amount of zinc-cadmium particles and a certain amount of seawater into the reaction bottle respectively, and then use a stirring rod to stir the seawater and zinc-cadmium particles, and then use a power pump to quantitatively extract the sample solution obtained after the reaction. Through subsequent experimental analysis of the sample solution, the corresponding nitrate content in the seawater can be finally obtained. At present, the existing experimental equipment controls the discharge of waste materials in the reaction bottle by driving the movement of the rubber ball through the actuator, but the rubber material easily adsorbs zinc-cadmium particles, and the zinc-cadmium particles adhering to the surface of the ball are difficult to be completely removed by flushing with clean water. In this way, when zinc-cadmium particles accumulate in the sealing part of the rubber ball, the rubber ball will cause the reaction bottle to fail to seal and cause leakage, forcing the experimenter to frequently stop the machine for manual cleaning, which seriously interferes with the continuity of the experimental process. This design flaw not only reduces the efficiency of the zinc-cadmium reduction method for determining the nitrate content in seawater, but also increases the labor maintenance cost. Summary of the Invention

[0004] In view of this, it is necessary to provide an experimental device for chemical reduction of nitrate in seawater for solving the above technical problems.

[0005] An experimental device for chemical reduction of nitrate in seawater, the experimental device comprising: The reaction flask is formed with a lower discharge pipe, the outer tube wall of the lower discharge pipe is connected with a telescopic sleeve and a sealing ring gasket in sequence from the inside to the outside, the telescopic sleeve is downwardly passed through the sealing ring gasket, and the telescopic sleeve is connected to a flat-end tube body on one end extending out of the sealing ring gasket; the telescopic sleeve includes a deformation portion, the outer diameter of the deformation portion gradually decreases in the direction away from the lower discharge pipe, and the deformation portion can be folded relative to the sealing ring gasket under the drive of the flat-end tube body; the sealing ring gasket includes a sealing portion, the outer diameter of the sealing portion gradually decreases in the direction away from the lower discharge pipe, and the inner diameter of the sealing portion on the end away from the lower discharge pipe is smaller than the outer diameter of the lower discharge pipe; A first feeding mechanism is used to add zinc-cadmium particles into the reaction bottle in a quantitative manner; a second feeding mechanism, for adding seawater into the reaction flask in a quantitative manner; a sealing opening and closing mechanism for opening or closing the lower discharge pipe, the sealing opening and closing mechanism comprising an opening and closing drive and a metal ball, the metal ball being in driving connection with the opening and closing drive, and capable of, under the driving of the opening and closing drive, pushing the flat-end tube body at least partially into the lower discharge pipe, and causing the metal ball to push the sealing portion of the sealing ring gasket against and limit the position on the telescopic sleeve, so that an accommodating chamber is enclosed and formed between the telescopic sleeve, the flat-end tube body, the metal ball, and the sealing ring gasket; When the sealing ring gasket abuts and seals against the metal sphere and the telescopic sleeve respectively, the telescopic sleeve can provide a damping force to the flat-end tube body, so that the flat-end tube body abuts and limits the position with the metal sphere, thereby restricting the zinc-cadmium particles from entering the accommodating chamber.

[0006] In one embodiment, when the flat-end tube body and the metal sphere are in abutment with each other for a limited position, an assembly gap is formed between the flat-end tube body and the metal sphere, and a size of the assembly gap is smaller than an outer diameter of the zinc-cadmium particles.

[0007] In one embodiment, the flat-end tube is configured as a cylindrical structure; The edge of the opening of one end of the flat-end tube away from the telescopic sleeve can abut against the metal sphere, so that the flat-end tube and the metal sphere are abutted and limited.

[0008] In one embodiment, the flat-end tube body is configured as a metal tube, and the flat-end tube body portion is received in the telescopic sleeve and is connected to the telescopic sleeve by gluing.

[0009] In one embodiment, the telescopic sleeve further includes a connecting portion and a cylindrical portion, wherein the connecting portion is sleeved on the lower discharge pipe and fixedly connected to the lower discharge pipe, and the cylindrical portion is sleeved on the flat-end pipe body and fixedly connected to the flat-end pipe body; The connecting portion is connected to the large-diameter end of the deformable portion as a whole, and the cylindrical portion is connected to the small-diameter end of the deformable portion as a whole.

[0010] In one embodiment, the telescopic sleeve is made of silicone rubber.

[0011] In one embodiment, the sealing ring gasket further includes a sleeve portion, which is sleeved on the telescopic sleeve and pressed against the telescopic sleeve to limit its position; The sleeve portion and the sealing portion are connected as one body.

[0012] In one embodiment, the sealing opening and closing mechanism further includes a clamp, which is arranged on the outside of the sealing ring gasket and is used to press and limit the sealing ring gasket and the telescopic sleeve to the lower discharge pipe.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The experimental equipment for chemical reduction of nitrate in seawater, for which protection is sought in this application, utilizes the abutment limit between the metal sphere and the flat-mouthed tube body to prevent direct contact between zinc-cadmium particles and the sealing ring gasket. Combined with the characteristic that the metal material is not easily adsorbed by particles, the experimental equipment can effectively avoid the sealing performance being affected by the adhesion of zinc-cadmium particles. This not only ensures multiple reliable sealing of the reaction bottle, but also prevents leakage problems caused by the accumulation of zinc-cadmium particles, thereby reducing efficiency losses caused by shutdowns for cleaning during the experiment and maintaining the continuity of the experimental process and the stability of automated operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the experimental equipment provided in this application.

[0016] Figure 2 This is a partial cross-sectional view of the reaction bottle in this application.

[0017] Figure 3 This is a partial cross-sectional view of the metal sphere of the present application closing the discharge tube below the reaction bottle.

[0018] Figure numerals: 100, experimental equipment; 10, reaction bottle; 11, lower discharge pipe; 111, outer tube wall; 112, tube mouth edge; 20, first feeding mechanism; 30, second feeding mechanism; 40, sealing opening and closing mechanism; 41, opening and closing drive member; 42, metal sphere; 43, swing seat; 44, clamp; 50, telescopic sleeve; 51, deformation part; 511, small-diameter end; 512, large-diameter end; 52, connecting part; 53, cylinder part; 60, sealing ring gasket; 61, sealing part; 62, sleeve part; 70, flat-mouth tube body; 71, opening edge; 101, accommodating chamber. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] It should be noted that when an element is referred to as being “provided on” another element, it may be directly provided on the other element or there may be an intermediate element. When an element is considered to be “provided on” another element, it may be directly provided on the other element or there may be an intermediate element. When an element is considered to be “fixed to” another element, it may be directly fixed to the other element or there may be an intermediate element.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figures 1 to 3As shown, the experimental equipment 100 for chemical reduction of nitrate in seawater claimed in the present application comprises a reaction bottle 10, a first feeding mechanism 20, a second feeding mechanism 30 and a sealing opening and closing mechanism 40. A lower discharge pipe 11 is formed on the reaction bottle 10. The outer tube wall 111 of the lower discharge pipe 11 is sequentially connected with a telescopic sleeve 50 and a sealing ring gasket 60 from the inside to the outside. The telescopic sleeve 50 is arranged to pass downward through the sealing ring gasket 60, and the telescopic sleeve 50 is connected to a flat-end tube body 70 on one end extending out of the sealing ring gasket 60; the first feeding mechanism 20 is used to add zinc and cadmium particles into the reaction bottle 10 in a quantitative manner; the second feeding mechanism 30 is used to add seawater into the reaction bottle 10 in a quantitative manner; the sealing opening and closing mechanism 40 is used to open or close the lower discharge pipe 11, and the sealing opening and closing mechanism 40 is used to open or close the lower discharge pipe 11. The mechanism 40 includes an opening and closing drive member 41 and a metal sphere 42. The metal sphere 42 is transmission-connected to the opening and closing drive member 41, and the metal sphere 42 can push the flat-end tube body 70 at least partially into the lower discharge pipe 11 under the drive of the opening and closing drive member 41, and make the metal sphere 42 push the sealing portion 61 of the sealing ring gasket 60 to press and limit it to the telescopic sleeve 50, so that the telescopic sleeve 50, the flat-end tube body 70, the metal sphere 42 and the sealing ring gasket 60 form an accommodating chamber 101; when the sealing ring gasket 60 is respectively abutted and sealed with the metal sphere 42 and the telescopic sleeve 50, the telescopic sleeve 50 can provide a damping force to the flat-end tube body 70, so that the flat-end tube body 70 is abutted and limited with the metal sphere 42, so as to limit the zinc-cadmium particles from entering the accommodating chamber 101. Here, the metal sphere 42 can be specifically made of aluminum alloy, and the surface of the metal sphere 42 is smooth, so that when the waste in the reaction bottle 10 is discharged, the remaining part after the nitrate reduction reaction in the seawater comes into contact with the metal sphere 42 and will not adhere to the surface of the metal sphere 42.

[0023] As can be seen from the above, when the experimental equipment 100 of the present application is working, the abutment limit between the metal sphere 42 and the flat-mouth tube body 70 is used to prevent the zinc-cadmium particles from directly contacting the sealing ring gasket 60. Combined with the characteristic that the metal material is not easy to adsorb particles, the experimental equipment 100 can effectively avoid the sealing performance being affected by the adhesion of zinc-cadmium particles. This not only ensures multiple reliable sealing of the reaction bottle 10, but also prevents leakage problems caused by the accumulation of zinc-cadmium particles, thereby reducing the efficiency loss caused by shutdown and cleaning during the experiment, and maintaining the continuity of the experimental process and the stability of automated operation.

[0024] It should be noted that the specific structure of the first feeding mechanism 20 of the present application, how to add zinc-cadmium particles into the reaction bottle 10 in a quantitative manner, the specific structure of the second feeding mechanism 30, how to add seawater into the reaction bottle 10 in a quantitative manner, how to quantitatively extract the sample solution after the reaction in the reaction bottle 10, as well as the specific structure of the reaction bottle 10 and the working principle of how to clean the reaction bottle 10 can all be referred to patent CN120102919A. Since it is not the focus of the protection requested by this application, it will not be elaborated here.

[0025] In the present application, when the flat-mouthed tube body 70 and the metal sphere 42 are abutted and limited, an assembly gap (not shown) is formed between the flat-mouthed tube body 70 and the metal sphere 42, and the size of the assembly gap is smaller than the outer diameter of the zinc-cadmium particles, thereby preventing the zinc-cadmium particles from entering the accommodating chamber 101 through the assembly gap between the flat-mouthed tube body 70 and the metal sphere 42, while the seawater in the reaction bottle 10 can enter the accommodating chamber 101 through the assembly gap.

[0026] like Figure 1 As shown, in one embodiment, the sealing opening and closing mechanism 40 further includes a swing seat 43, which is rotatably arranged relative to the reaction bottle 10 and connected to the metal ball 42, for supporting the metal ball 42. The opening and closing driving member 41 is configured as an electric push rod, and the telescopic rod of the electric push rod is hingedly connected to the swing seat 43, for driving the swing seat 43 to rotate relative to the reaction bottle 10. In other words, the sealing opening and closing mechanism 40 can automatically control the opening and closing of the upper and lower discharge pipes 11 of the reaction bottle 10 by the metal ball 42 by controlling the telescopic movement of the telescopic rod on the electric push rod.

[0027] like Figures 1 to 3 As shown, in one embodiment, the sealing opening and closing mechanism 40 further includes a clamp 44, which is disposed on the outside of the sealing ring gasket 60 and is used to press the sealing ring gasket 60 and the telescopic sleeve 50 against the lower discharge pipe 11, thereby achieving the assembly connection of the telescopic sleeve 50 and the sealing ring gasket 60 on the lower discharge pipe 11. During use of the experimental device 100, if the sealing ring gasket 60 becomes damaged, the structural features of the clamp 44 can be utilized to remove the clamp 44 to release the restraint on the sealing ring gasket 60, allowing the experimenter to easily replace the sealing ring gasket 60.

[0028] like Figure 2 、 Figure 3As shown, in one embodiment, the telescopic sleeve 50 includes a deformable portion 51 whose outer diameter gradually decreases as it moves away from the lower discharge pipe 11. Furthermore, the deformable portion 51 is capable of folding relative to the sealing ring 60 under the influence of the flat-end tube 70. In other words, this embodiment utilizes the folding of the deformable portion 51 under the influence of the flat-end tube 70 to allow the flat-end tube 70 to at least partially extend into the lower discharge pipe 11. The folded deformable portion 51, acting through action and reaction, limits the movement of the flat-end tube 70, thereby securing the flat-end tube 70 against the metal sphere 42.

[0029] like Figure 2 、 Figure 3 As shown, in this embodiment, the telescopic sleeve 50 also includes a connecting portion 52 and a cylindrical portion 53. The connecting portion 52 is mounted on the lower discharge pipe 11 and is fixedly connected to the lower discharge pipe 11, while the cylindrical portion 53 is mounted on the flat-end tube body 70 and is fixedly connected to the flat-end tube body 70. The connecting portion 52 is integrally connected to the large-diameter end 512 of the deformable portion 51, and the cylindrical portion 53 is integrally connected to the small-diameter end 511 of the deformable portion 51. The telescopic sleeve 50 is made of silicone rubber, which provides a certain degree of elasticity to ensure that the deformable portion 51 of the telescopic sleeve 50 can be folded and provide a damping force to the flat-end tube body 70 after folding. It should be noted that the portion of the telescopic sleeve 50 that contacts the zinc-cadmium particles in the reaction bottle 10 is coated with a film to prevent the zinc-cadmium particles from adhering to the telescopic sleeve 50 and affecting the accuracy of the nitrate content in seawater during the next operation of the experimental device 100.

[0030] like Figure 2 、 Figure 3 As shown, in one embodiment, the sealing ring gasket 60 includes a sealing portion 61, the outer diameter of the sealing portion 61 gradually decreases in the direction away from the lower discharge pipe 11, and the inner diameter of the end of the sealing portion 61 away from the lower discharge pipe 11 is smaller than the outer diameter of the lower discharge pipe 11, and the metal ball 42 can push the sealing portion 61 to press and limit it to the telescopic sleeve 50, thereby achieving abutment and sealing between the metal ball 42 and the telescopic sleeve 50, preventing the liquid entering the accommodating chamber 101 from leaking. Here, the end of the sealing portion 61 away from the lower discharge pipe 11 is configured as a constricted structure. It should be noted that the experimental equipment 100 of the present application uses the sealing ring gasket 60 directly with the metal ball 42. When the metal ball 42 blocks the lower discharge pipe 11, the sealing ring gasket 60 can play a buffering and protective role for the telescopic sleeve 50.

[0031] As can be seen from the above, since the inner diameter of the sealing portion 61 on the sealing ring gasket 60 of this embodiment away from the end of the lower discharge pipe 11 is set smaller than the outer diameter of the lower discharge pipe 11, when the metal sphere 42 pushes the sealing portion 61 to press and limit on the telescopic sleeve 50, the pipe mouth edge 112 of the lower discharge pipe 11 can abut and limit with the folded telescopic sleeve 50. That is, the lower discharge pipe 11 can use the pipe mouth edge 112 to provide support for the sealing portion 61 of the sealing ring gasket 60 to press and limit the telescopic sleeve 50, so as to meet the use requirement of the sealing portion 61 to seal the telescopic sleeve 50 and the metal sphere 42 at the same time.

[0032] like Figure 2 、 Figure 3 As shown, in this embodiment, the sealing ring gasket 60 further includes a sleeve portion 62, which is sleeved onto the telescopic sleeve 50 and pressed against the telescopic sleeve 50 to achieve an assembled connection between the sealing ring gasket 60 and the telescopic sleeve 50. Here, the sleeve portion 62 and the sealing portion 61 are connected as a whole and can be made of relatively soft silicone or rubber.

[0033] like Figure 2 、 Figure 3 As shown, in one embodiment, the flat-end tube body 70 is configured as a cylindrical structure; and the open edge 71 of the flat-end tube body 70 at one end away from the telescopic sleeve 50 can abut against the metal sphere 42, so that the flat-end tube body 70 and the metal sphere 42 are abutted and limited. Here, the flat-end tube body 70 is configured as a metal tube, and the flat-end tube body 70 is configured as a metal tube. Moreover, the flat-end tube body 70 is partially received within the telescopic sleeve 50 and is connected to the telescopic sleeve 50 by adhesive. It should be noted that the flat-end tube body 70 and the telescopic sleeve 50 are bonded and fixed with glue having high viscosity to prevent the telescopic sleeve 50 from falling off due to the interaction between the flat-end tube body 70 and the telescopic sleeve 50.

[0034] As can be seen from the above, when the experimental equipment 100 of the present application uses the sealing opening and closing mechanism 40 to close the lower discharge pipe 11, the metal sphere 42 first contacts the flat-mouthed tube body 70 under the drive of the opening and closing drive member 41, and pushes the flat-mouthed tube body 70 to drive the deformation portion 51 of the telescopic sleeve 50 to fold. During this process, the metal sphere 42 will not contact the sealing ring gasket 60. As the metal sphere 42 continues to move, until the metal sphere 42 pushes the sealing ring gasket 60 to press against the telescopic sleeve 50.

[0035] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. Any appropriate changes and modifications to the above embodiments are intended to fall within the scope of protection claimed by the present invention as long as they are within the spirit of the present invention.

Claims

1. An experimental device for chemical reduction of nitrate in seawater, characterized in that: The experimental equipment (100) includes: A reaction bottle (10) is formed with a lower discharge pipe (11), the outer tube wall (111) of the lower discharge pipe (11) is sequentially connected with a telescopic sleeve (50) and a sealing ring gasket (60) from the inside to the outside, the telescopic sleeve (50) is arranged to pass through the sealing ring gasket (60) downward, and the telescopic sleeve (50) is connected to a flat tube body (70) on one end extending from the sealing ring gasket (60); the telescopic sleeve (50) includes a deformation portion (51), the outer wall of the deformation portion (51) is connected to the outer wall of the deformation portion (51) The diameter gradually decreases in a direction away from the lower discharge pipe (11), and the deformable portion (51) can be folded relative to the sealing ring gasket (60) under the drive of the flat-end pipe body (70); the sealing ring gasket (60) includes a sealing portion (61), the outer diameter of the sealing portion (61) gradually decreases in a direction away from the lower discharge pipe (11), and the inner diameter of an end portion of the sealing portion (61) away from the lower discharge pipe (11) is smaller than the outer diameter of the lower discharge pipe (11); A first feeding mechanism (20) is used to add zinc-cadmium particles into the reaction bottle (10) in a quantitative manner; A second feeding mechanism (30) is used to add seawater into the reaction bottle (10) in a quantitative manner; A sealing opening and closing mechanism (40) is used to open or close the lower discharge pipe (11), the sealing opening and closing mechanism (40) comprising an opening and closing driving member (41) and a metal sphere (42), the metal sphere (42) being in transmission connection with the opening and closing driving member (41), and the metal sphere (42) can, under the driving of the opening and closing driving member (41), push the flat-end tube body (70) to at least partially extend into the lower discharge pipe (11), and enable the metal sphere (42) to push the sealing portion (61) of the sealing ring gasket (60) against the telescopic sleeve (50) to limit the position, so that an accommodating chamber (101) is formed between the telescopic sleeve (50), the flat-end tube body (70), the metal sphere (42) and the sealing ring gasket (60); When the sealing ring gasket (60) is in contact and sealed with the metal sphere (42) and the telescopic sleeve (50), the telescopic sleeve (50) can provide a damping force to the flat-end tube (70), so that the flat-end tube (70) and the metal sphere (42) are in contact and limited, thereby limiting the zinc-cadmium particles from entering the accommodating chamber (101).

2. The experimental equipment for chemical reduction of nitrate in seawater according to claim 1, characterized in that: When the flat-end tube body (70) and the metal sphere (42) are in contact and limited, an assembly gap is formed between the flat-end tube body (70) and the metal sphere (42), and the size of the assembly gap is smaller than the outer diameter of the zinc-cadmium particles.

3. The experimental equipment for chemical reduction of nitrate in seawater according to claim 2, characterized in that: The flat-end tube body (70) is configured as a cylindrical structure; An opening edge (71) on one end of the flat-end tube body (70) away from the telescopic sleeve (50) can abut against the metal sphere (42), so that the flat-end tube body (70) and the metal sphere (42) abut and limit each other.

4. The experimental equipment for chemical reduction of nitrate in seawater according to claim 3, characterized in that: The flat-end tube body (70) is configured as a metal tube, and a portion of the flat-end tube body (70) is accommodated in the telescopic sleeve (50) and is connected to the telescopic sleeve (50) in an adhesive manner.

5. The experimental equipment for chemical reduction of nitrate in seawater according to claim 1, characterized in that: The telescopic sleeve (50) further comprises a connecting portion (52) and a cylindrical portion (53), wherein the connecting portion (52) is sleeved on the lower discharge pipe (11) and is connected and fixed to the lower discharge pipe (11), and the cylindrical portion (53) is sleeved on the flat-end pipe body (70) and is connected and fixed to the flat-end pipe body (70); The connecting portion (52) is connected to the large-diameter end (512) of the deformable portion (51) as a whole, and the cylindrical portion (53) is connected to the small-diameter end (511) of the deformable portion (51) as a whole.

6. The experimental equipment for chemical reduction of nitrate in seawater according to claim 5, characterized in that: The telescopic sleeve (50) is made of silicone rubber.

7. The experimental equipment for chemical reduction of nitrate in seawater according to claim 1, characterized in that: The sealing ring gasket (60) further includes a sleeve portion (62), wherein the sleeve portion (62) is sleeved on the telescopic sleeve (50) and is pressed against the telescopic sleeve (50) to limit the position; The sleeve portion (62) and the sealing portion (61) are connected as one body.

8. The experimental equipment for chemical reduction of nitrate in seawater according to claim 1, characterized in that: The sealing opening and closing mechanism (40) further includes a clamp (44), which is arranged on the outside of the sealing ring gasket (60) and is used to press the sealing ring gasket (60) and the telescopic sleeve (50) onto the lower discharge pipe (11).

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