Acid / alkali solvent sampler

Abstract

The invention discloses an acid / alkali solvent sampler. The acid / alkali solvent sampler comprises a sampling bottle and an extraction mechanism, the extraction mechanism comprises a base, an inner sleeve, an outer sleeve, a liquid suction pipe and a liquid discharge pipe; the upper end of the pipette is communicated with the cavity of the inner sleeve, the lower end of the pipette extends into the sampling bottle, and a first one-way valve is arranged in the pipette; an annular cavity is formed between the outer sleeve and the inner sleeve, a sleeve wall through hole is formed in the sleeve wall of the inner sleeve, and the liquid inlet end of the liquid discharging pipe is communicated with the annular cavity; a sealing plug is arranged in the inner sleeve, and the inner sleeve is connected with a first driving assembly; a sealing ring is arranged in the annular cavity, and the outer sleeve is connected with a second driving assembly. According to the acid / alkali solvent sampler, automatic operation is achieved, the sampling bottle is in a sealed state in the sampling process, the bottle opening of the sampling bottle does not need to be opened, the problem that acid / alkali mist volatilizes from the bottle opening in the sampling process is avoided, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of acid / alkali solvent sampling in the chemical industry, and particularly to an acid / alkali solvent sampler. Background Art

[0002] In the chemical field, acid / alkali solvents are often used. For example, hydrochloric acid solvent, sodium hydroxide solvent, etc. These solvents can be used for desalination in the workshop or for adjusting the pH value of the solution. When using these acid / alkali solvents, it is necessary to sample them to test whether their pH value, concentration, etc. meet the requirements.

[0003] In the prior art, generally, a certain amount of acid / alkali solvent is filled into a sampling bottle, and the sealing plug of the sampling bottle is covered. The sampling bottle is taken to the laboratory, the sealing plug is opened, and a sampling tube is used to sample. Since it is sometimes necessary to sample multiple times using the sampling tube, the sealing plug needs to be opened and closed multiple times, which is a cumbersome process. Moreover, acid / alkali solvents are volatile, and the volatilized acid / alkali mist is likely to damage people's skin and mucous membranes, causing a chemical burning sensation and discomfort to the human body; in addition, the volatilized acid / alkali mist will undergo an oxidation reaction when contacting the metal surface, causing corrosion and damage to the instrument. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an acid / alkali solvent sampler. During the sampling process, the sampling bottle is in a sealed state, and there is no need to open the bottle mouth of the sampling bottle, avoiding the problem of acid / alkali mist volatilizing from the bottle mouth during sampling and improving the user experience.

[0005] The technical solution of the present invention provides an acid / alkali solvent sampler, which includes a sampling bottle for storing acid / alkali solvent and an extraction mechanism for extracting the acid / alkali solvent in the sampling bottle;

[0006] The extraction mechanism includes a base connected to the bottle mouth of the sampling bottle, an inner sleeve and an outer sleeve connected to the base, a liquid suction pipe connected to the lower part of the base, and a liquid discharge pipe connected to the outside of the outer sleeve;

[0007] The upper end of the liquid suction pipe communicates with the cavity of the inner sleeve, the lower end of the liquid suction pipe extends into the sampling bottle, and a first one-way valve for preventing the solvent from flowing from the inner sleeve to the sampling bottle is provided in the liquid suction pipe;

[0008] An annular cavity is formed between the outer sleeve and the inner sleeve, a through hole in the barrel wall communicating with the annular cavity is provided on the barrel wall of the inner sleeve, and the liquid inlet end of the liquid discharge pipe communicates with the annular cavity;

[0009] A sealing plug is provided in the inner sleeve, and a first driving component for driving the sealing plug to slide up and down is connected to the inner sleeve;

[0010] A sealing ring is arranged in the annular cavity, and a second driving component for driving the sealing ring to slide up and down is connected to the outer sleeve.

[0011] In one of the optional technical solutions, a second one-way valve is provided in the through hole of the cylinder wall for preventing the solvent from flowing from the annular cavity into the inner sleeve.

[0012] In one of the optional technical solutions, a third one-way valve is provided in the drain pipe for preventing the solvent from flowing from the drain pipe into the annular cavity.

[0013] In one of the optional technical solutions, a ring plate is provided on the outer side of the upper end of the inner sleeve, and an internal threaded hole is provided on the ring plate;

[0014] The first driving assembly includes a lifting plate located above the inner sleeve, a connecting rod connected between the lifting plate and the sealing plug, a screw rod pivotally connected to the lifting plate, and a motor mounted on the lifting plate and used to drive the screw rod to rotate;

[0015] The screw rod passes through the internal threaded hole, and the external thread on the screw rod is meshed with the internal thread in the internal threaded hole.

[0016] In one of the optional technical solutions, one screw rod is connected to each of the two opposite sides of the lifting plate, and two internal threaded holes are correspondingly provided on the annular plate, and the two screw rods pass through the two internal threaded holes respectively;

[0017] Two motors are installed on the lifting plate, each of which is drivingly connected to one of the screw rods and is used to drive the two screw rods to rotate synchronously.

[0018] In one of the optional technical solutions, the second drive assembly includes a piston drive element;

[0019] The piston driving element is mounted on the upper end cover of the outer sleeve, and the piston rod of the piston driving element passes through the upper end cover and is connected to the sealing ring.

[0020] In one of the optional technical solutions, the second drive assembly includes two sets of piston drive elements, and the two sets of piston drive elements are arranged on opposite sides of the inner sleeve.

[0021] In one of the optional technical solutions, a connecting ring is detachably connected to the bottom of the base, and an inner ring surface of the connecting ring is provided with an internal thread;

[0022] The outer side of the mouth of the sampling bottle is provided with a circle of bosses, and the outer annular surface of the bosses is provided with external threads;

[0023] The connecting ring is sleeved outside the boss, and the internal thread on the connecting ring meshes with the external thread on the boss.

[0024] In one optional technical solution, the lower end of the liquid suction tube is a pointed end portion;

[0025] A sealing ring is provided in the bottle mouth, and a V-shaped groove for positioning the pointed end portion and facilitating the piercing of the pointed end portion is provided in the middle of the sealing ring.

[0026] In one optional technical solution, both the inner sleeve and the outer sleeve are transparent sleeves, and a scale is provided on the barrel wall of the outer sleeve.

[0027] Adopting the above technical solution, the following beneficial effects are achieved:

[0028] The acid / alkali solvent sampler provided by the present invention includes a sampling bottle and an extraction mechanism, and the extraction mechanism is installed on the bottle mouth of the sampling bottle. When in use, first remove the extraction mechanism, fill the sampling bottle with the acid / alkali solvent to be measured, and then install the extraction mechanism on the bottle mouth of the sampling bottle. When sampling, first use the first driving component to drive the sealing plug to move upward in the inner sleeve, so as to suck the acid / alkali solvent in the sampling bottle into the cavity of the inner sleeve through the liquid suction tube; then use the first driving component to drive the sealing plug to move downward in the inner sleeve, and press the acid / alkali solvent in the inner sleeve into the annular cavity between the inner sleeve and the outer sleeve through the through hole in the barrel wall; then use the second driving component to drive the sealing ring to move downward, and output the acid / alkali solvent in the annular cavity to the detection instrument through the drain pipe.

[0029] The acid / alkali solvent sampler provided by the present invention realizes automatic operation. During the sampling process, the sampling bottle is in a sealed state, and there is no need to open the bottle mouth of the sampling bottle, avoiding the problem of acid / alkali mist volatilizing from the bottle mouth during sampling and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Referring to the drawings, the disclosure of the present invention will become more understandable. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the drawings:

[0031] Figure 1 is a cross-sectional view of the acid / alkali solvent sampler provided by an embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of the extraction mechanism;

[0033] Figure 3 is a partially enlarged view of the extraction mechanism;

[0034] Figure 4 is an installation schematic diagram of the base, the inner sleeve and the outer sleeve;

[0035] Figure 5 is a cross-sectional view of the sampling bottle;

[0036] Figure 6 is a schematic diagram when sampling, the first driving component drives the sealing plug to rise along arrow A, and the acid / alkali solvent enters the inner sleeve;

[0037] Figure 7 is a schematic diagram when the first driving component drives the sealing plug to descend along arrow B, and the acid / alkali solvent enters the annular cavity;

[0038] Figure 8 is a schematic diagram when the sealing plug descends to the lowest position, and all the acid / alkali solvent in the inner sleeve enters the annular cavity;

[0039] Figure 9 is a schematic diagram when the second driving component drives the sealing ring to descend, and the acid / alkali solvent in the annular cavity is output from the drain pipe. Detailed implementation manners

[0040] The following further illustrates the detailed implementation manners of the present invention with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0041] As Figures 1-9 shown, an acid / alkali solvent sampler provided by an embodiment of the present invention includes a sampling bottle 1 for storing an acid / alkali solvent 3 and an extraction mechanism 2 for extracting the acid / alkali solvent 3 in the sampling bottle 1.

[0042] The extraction mechanism 2 includes a base 21 connected to the bottle mouth of the sampling bottle 1, an inner sleeve 22 and an outer sleeve 23 connected to the base 21, a liquid suction pipe 24 connected to the lower part of the base 21, and a drain pipe 25 connected to the outer side of the outer sleeve 23.

[0043] The upper end of the liquid suction pipe 24 is communicated with the cavity 220 of the inner sleeve 22, the lower end of the liquid suction pipe 24 extends into the sampling bottle 1, and a first one-way valve V1 for preventing the solvent from flowing from the inner sleeve 22 to the sampling bottle 1 is provided in the liquid suction pipe 24.

[0044] An annular cavity 230 is formed between the outer sleeve 23 and the inner sleeve 22. A through hole 223 communicating with the annular cavity 230 is provided on the barrel wall of the inner sleeve 22, and the liquid inlet end of the drain pipe 25 is communicated with the annular cavity 230.

[0045] A sealing plug 26 is provided in the inner sleeve 22, and a first driving component 28 for driving the sealing plug 26 to slide up and down is connected to the inner sleeve 22.

[0046] A sealing ring 27 is provided in the annular cavity 230, and a second driving assembly 29 for driving the sealing ring 27 to slide up and down is connected to the outer sleeve 23.

[0047] The acid / alkali solvent sampler provided by the present invention is used for sampling and detecting acid / alkali solvents. Acid / alkali solvents are generally industrial hydrochloric acid, sulfuric acid, sodium hydroxide solution, etc.

[0048] The acid / alkali solvent sampler includes a sampling bottle 1 and an extraction mechanism 2. The extraction mechanism 2 is installed on the bottle mouth of the sampling bottle 1. The sampling bottle 1 is used to store the acid / alkali solvent to be detected, and the extraction mechanism 2 is used to extract the acid / alkali solvent in the sampling bottle 1 and transport it to a detection instrument to detect the pH value, concentration, etc. of the acid / alkali solvent through the detection instrument.

[0049] The extraction mechanism 2 includes a base 21, an inner sleeve 22, an outer sleeve 23, a liquid suction pipe 24, a liquid discharge pipe 25, a sealing plug 26, a sealing ring 27, a first driving assembly 28, a second driving assembly 29, etc.

[0050] The base 21 is connected to the bottle mouth of the sampling bottle 1, which can be connected by threads or by a buckle. The base 21 serves to seal the bottle mouth of the sampling bottle 1. The inner sleeve 22 and the outer sleeve 23 are respectively provided on the base 21. The outer sleeve 23 is sleeved outside the inner sleeve 22. The inner sleeve 22 is higher than the outer sleeve 23, and an annular cavity 230 is formed between the inner sleeve 22 and the outer sleeve 23. The base 21 can be composed of the bottom plates of the inner sleeve 22 and the outer sleeve 23. The top of the inner sleeve 22 is provided with a top cover 221, and the upper end of the outer sleeve 23 is provided with an upper end cover 231. The inner sleeve 22 passes through the upper end cover 231. A barrel wall through hole 223 is provided on the barrel wall of the inner sleeve 22. The barrel wall through hole 223 is located at the lower end of the barrel wall of the inner sleeve 22, and the barrel wall through hole 223 communicates the cavity 220 of the inner sleeve 22 with the outer annular cavity 230. The solvent in the cavity 220 can enter the annular cavity 230 through the barrel wall through hole 223.

[0051] Preferably, a plurality of barrel wall through holes 223 are provided at intervals on the barrel wall of the inner sleeve 22 to uniformly transport the solvent to the surrounding annular cavity 230.

[0052] A base opening 211 is provided in the middle of the base 21. The upper end of the liquid suction pipe 24 is connected to the base opening 211, and the lower end of the liquid suction pipe 24 extends into the sampling bottle 1. Preferably, the lower end of the liquid suction pipe 24 is inserted into the middle and lower part of the sampling bottle 1. A first one-way valve V1 is provided in the liquid suction pipe 24 and / or the base opening 211. The first one-way valve V1 only allows the solvent to flow from the sampling bottle 1 into the cavity 220 and prevents the solvent from flowing from the cavity 220 into the sampling bottle 1.

[0053] The barrel wall of the outer barrel 23 is provided with a barrel wall opening 232, and one end of the drain pipe 25 is connected to the barrel wall opening 232, which communicates with the annular cavity 230. The solvent in the annular cavity 230 can be output through the drain pipe 25.

[0054] The sealing plug 26 is a rubber plug, which is assembled in the cavity 220 of the inner barrel 22 and sealed with the barrel wall of the inner barrel 22. The sealing plug 26 can slide axially along the inner barrel 22 under the action of an external force.

[0055] The first driving assembly 28 is used to drive the sealing plug 26 to move up and down in the inner barrel 22. The first driving assembly 28 can adopt a piston mechanism (oil cylinder, air cylinder) or a motor screw mechanism. The first driving assembly 28 can be installed on the barrel wall or the top cover 221 of the inner barrel 22, and the output end of the first driving assembly 28 is connected to the sealing plug 26.

[0056] When the first driving assembly 28 is in the initial state, the first driving assembly 28 drives the sealing plug 26 to be in the descending state, and the sealing plug 26 is at the bottom of the cavity 220 of the inner barrel 22, roughly close to the top surface of the base 21.

[0057] As Figures 6-8 shown, when the first driving assembly 28 drives the sealing plug 26 to rise along the arrow A, the acid / alkali solvent 3 in the sampling bottle 1 is sucked into the cavity 220 of the inner barrel 22 through the liquid suction pipe 24. When the first driving assembly 28 drives the sealing plug 26 to descend along the arrow B, the acid / alkali solvent 3 in the cavity 220 is pressed down, and the acid / alkali solvent 3 enters the annular cavity 230 through the barrel wall through hole 223. When the sealing plug 26 descends to the upper surface of the base 21, all the acid / alkali solvent 3 in the cavity 220 is discharged into the annular cavity 230.

[0058] The sealing ring 27 is a rubber ring, which is assembled in the annular cavity 230 and sealed with the barrel walls of the inner barrel 22 and the outer barrel 23 respectively. The sealing ring 27 can slide axially along the inner barrel 22 / outer barrel 23 under the action of an external force.

[0059] The second driving assembly 29 is used to drive the sealing ring 27 to move up and down in the annular cavity 230. The second driving assembly 29 can adopt a piston mechanism (oil cylinder, air cylinder) or a motor screw mechanism. The second driving assembly 29 can be installed on the barrel wall or the upper end cover 231 of the outer barrel 23, and the output end of the second driving assembly 29 is connected to the sealing ring 27.

[0060] When the second driving assembly 29 is in the initial state, the second driving assembly 29 drives the sealing ring 27 to be in the raised state, and the sealing ring 27 is at the top of the annular cavity 230, roughly close to the bottom surface of the upper end cover 231.

[0061] As Figures 6-8As shown, when the first driving component 28 drives the sealing plug 26 to move up and down, the second driving component 29 remains in the initial state, and the sealing ring 27 is in the raised state to vacate the annular cavity 230, facilitating the entry of the acid / alkali solvent into the annular cavity 230.

[0062] As Figure 9 shown, when the first driving component 28 drives the sealing plug 26 to descend, and after the sealing plug 26 discharges all the acid / alkali solvent in the cavity 220 into the annular cavity 230, the second driving component 29 starts to actuate. The second driving component 29 drives the sealing ring 27 to move downward in the annular cavity 230, thereby discharging the acid / alkali solvent in the annular cavity 230 into the drain pipe 25, and the acid / alkali solvent 3 is output to the detection instrument through the drain pipe 25.

[0063] Thus, the acid / alkali solvent sampler provided by the present invention realizes automatic operation. During the sampling process, the sampling bottle 1 is in a sealed state, and there is no need to open the bottle mouth of the sampling bottle 1, avoiding the problem of acid / alkali mist volatilizing from the bottle mouth during sampling and improving the user experience.

[0064] In one embodiment, as Figures 1-3 shown, a second one-way valve V2 for preventing the solvent from flowing from the annular cavity 230 into the inner sleeve 22 is provided in the barrel wall through hole 223. When the second driving component 29 drives the sealing ring 27 to move downward in the annular cavity 230, the second one-way valve V2 prevents the acid / alkali solvent in the annular cavity 230 from flowing into the cavity 220 of the inner sleeve 22 through the barrel wall through hole 223.

[0065] In one embodiment, as Figures 1-3 shown, a third one-way valve V3 for preventing the solvent from flowing from the drain pipe 25 into the annular cavity 230 is provided in the drain pipe 25. It is preferably provided at the liquid inlet end of the drain pipe 25 or in the barrel wall opening 232. When the second driving component 29 drives the sealing ring 27 to move upward and reset to the initial position in the annular cavity 230, the third one-way valve V3 prevents the acid / alkali solvent in the drain pipe 25 from flowing back into the annular cavity 230.

[0066] In one embodiment, as Figures 1-4 shown, a circular plate 222 is provided on the outer side of the upper end of the inner sleeve 22, and an internal thread hole 225 is provided on the circular plate 222.

[0067] The first driving component 28 includes a lifting plate 281 above the inner sleeve 22, a connecting rod 282 connected between the lifting plate 281 and the sealing plug 26, a screw rod 283 pivotally connected to the lifting plate 281, and a motor 284 installed on the lifting plate 281 and used to drive the screw rod 283 to rotate.

[0068] The screw rod 283 passes through the internal thread hole 225, and the external thread on the screw rod 283 meshes with the internal thread in the internal thread hole 225.

[0069] In this embodiment, a circular plate 222 is provided on the outer side of the upper end of the inner sleeve 22 for mounting the first driving assembly 28. A number of internal thread holes 225 are provided on the circular plate 222.

[0070] The first driving assembly 28 includes a lifting plate 281, a connecting rod 282, a screw rod 283 and a motor 284. The lifting plate 281 is located above the top cover 221 of the inner sleeve 22. The connecting rod 282 is connected between the lifting plate 281 and the sealing plug 26. A through hole 225 is provided on the lifting plate 281. The upper end of the screw rod 283 passes through the through hole 225, and a bearing is provided between the screw rod 283 and the hole wall of the through hole 225 to achieve axial positioning. The screw rod 283 is pivotally connected to the lifting plate 281. The screw rod 283 can rotate relative to the lifting plate 281 and move up and down integrally with the lifting plate 281. The motor 284 is mounted on the top of the lifting plate 281, and the rotating shaft of the motor 284 is directly connected to or connected through a transmission mechanism with the upper end of the screw rod 283 to drive the screw rod 283 to rotate.

[0071] The screw rod 283 passes through the internal thread hole 225, and the external thread on the screw rod 283 meshes with the internal thread in the internal thread hole 225.

[0072] When the motor 284 rotates forward, the screw rod 283 is driven to rotate forward. Under the interaction of its external thread and the internal thread of the internal thread hole 225, the screw rod 283 moves upward relative to the circular plate 222, and then drives the lifting plate 281 to rise, thereby driving the sealing plug 26 to rise synchronously in the inner sleeve 22 through the connecting rod 282.

[0073] When the motor 284 rotates reversely, the screw rod 283 is driven to rotate reversely. Under the interaction of its external thread and the internal thread of the internal thread hole 225, the screw rod 283 moves downward relative to the circular plate 222, and then drives the lifting plate 281 to descend, thereby driving the sealing plug 26 to descend synchronously in the inner sleeve 22 through the connecting rod 282.

[0074] In one of the embodiments, as Figures 1-4 shown, a screw rod 283 is respectively connected to the opposite sides of the lifting plate 281. Two internal thread holes 225 are correspondingly provided on the circular plate 222, and the two screw rods 283 respectively pass through the two internal thread holes 225.

[0075] Two motors 284 are mounted on the lifting plate 281. Each motor 284 is in transmission connection with a screw rod 283 and is used to drive the two screw rods 283 to rotate synchronously.

[0076] By configuring two sets of motors 284 and screws 283 to drive the two ends of the lifting plate 281 to lift synchronously, the stability of the lifting operation is improved.

[0077] In one embodiment, as Figures 1-4 shown, the second driving assembly 29 includes a piston driving element 291.

[0078] The piston driving element 291 is installed on the upper end cover 231 of the outer sleeve 23. The piston rod 292 of the piston driving element 291 passes through the upper end cover 231 and is connected to the sealing ring 27.

[0079] In this embodiment, the second driving assembly 29 adopts a piston driving element 291, such as an oil cylinder driving element or a cylinder driving element. The cylinder barrel of the piston driving element 291 is installed on the upper end cover 231. The upper end cover 231 is provided with a through hole 233 for the piston rod 292 of the piston driving element 291 to pass through and be connected to the sealing ring 27. By moving the piston rod 292 up and down, the sealing ring 27 is driven to move up and down in the annular cavity 230.

[0080] In one embodiment, as Figures 1-4 shown, the second driving assembly 29 includes two sets of piston driving elements 291. The two sets of piston driving elements 291 are arranged on opposite sides of the inner sleeve 22, improving the stability of the up and down movement of the sealing ring 27 in the annular cavity 230.

[0081] In one embodiment, as Figures 1-5 shown, a connecting ring 212 is detachably connected to the bottom of the base 21. The inner ring surface of the connecting ring 212 is provided with internal threads. An outer ring of the mouth of the sampling bottle 1 is provided with a boss 11. The outer ring surface of the boss 11 is provided with external threads. The connecting ring 212 is sleeved outside the boss 11. The internal threads on the connecting ring 212 are engaged with the external threads on the boss 11, facilitating the assembly of the base 21 on the mouth of the sampling bottle 1.

[0082] According to needs, connecting rings 212 of different sizes can be replaced to adapt to mouths and bosses 11 with different apertures.

[0083] In one embodiment, as Figures 1-2 and Figure 5 shown, the lower end of the liquid suction pipe 24 is a pointed end 241. A sealing ring 13 is provided in the mouth of the bottle for sealing the mouth of the bottle.

[0084] The middle of the sealing ring 13 is provided with a positioning pointed end 241 and a V-shaped groove 131 facilitating the piercing of the pointed end 241, so that when the liquid suction pipe 24 is moved downward, the pointed end 241 is aligned with the V-shaped groove 131 and pierces the sealing ring 13 to insert into the sampling bottle 1.

[0085] According to requirements, a retaining ring 12 can be arranged in the bottle mouth for supporting the sealing ring 13.

[0086] In one embodiment, both the inner sleeve 22 and the outer sleeve 23 are transparent sleeves, and the inner sleeve 22 and the outer sleeve 23 can be made of transparent plastic materials. A scale is provided on the barrel wall of the outer sleeve 23 so as to observe the dosage of the discharged acid / alkali solvent.

[0087] According to requirements, the above technical solutions can be combined to achieve the best technical effect.

[0088] The above are only the principles and preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, based on the principle of the present invention, several other variants can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. An acid / base solvent sampler, characterized in that: It comprises a sampling bottle for storing an acid / alkaline solvent and an extraction mechanism for extracting the acid / alkaline solvent from the sampling bottle; The extraction mechanism includes a base connected to the bottle mouth of the sampling bottle, an inner sleeve and an outer sleeve connected to the base, a liquid suction tube connected below the base, and a liquid discharge tube connected to the outside of the outer sleeve; The upper end of the pipette is communicated with the cavity of the inner sleeve, the lower end of the pipette extends into the sampling bottle, and the pipette is provided with a first one-way valve for preventing the solvent from flowing from the inner sleeve into the sampling bottle; An annular cavity is formed between the outer sleeve and the inner sleeve, a through hole in the inner sleeve wall is provided on the inner sleeve wall and communicates with the annular cavity, and a liquid inlet end of the liquid discharge pipe is communicated with the annular cavity; A sealing plug is provided in the inner sleeve, and a first driving component for driving the sealing plug to slide up and down is connected to the inner sleeve; A sealing ring is arranged in the annular cavity, and a second driving component for driving the sealing ring to slide up and down is connected to the outer sleeve.

2. The acid / base solvent sampler according to claim 1, characterized in that: A second one-way valve for preventing the solvent from flowing from the annular cavity into the inner sleeve is arranged in the through hole of the cylinder wall.

3. The acid / base solvent sampler according to claim 1, characterized in that: The drain pipe is provided with a third one-way valve for preventing the solvent from flowing from the drain pipe into the annular cavity.

4. The acid / base solvent sampler according to claim 1, characterized in that: A ring plate is provided on the outer side of the upper end of the inner sleeve, and an internal threaded hole is provided on the ring plate; The first driving assembly includes a lifting plate located above the inner sleeve, a connecting rod connected between the lifting plate and the sealing plug, a screw rod pivotally connected to the lifting plate, and a motor mounted on the lifting plate and used to drive the screw rod to rotate; The screw rod passes through the internal threaded hole, and the external thread on the screw rod is meshed with the internal thread in the internal threaded hole.

5. The acid / base solvent sampler according to claim 4, characterized in that: The two opposite sides of the lifting plate are respectively connected with a screw rod, and the annular plate is correspondingly provided with two internal threaded holes, and the two screw rods pass through the two internal threaded holes respectively; Two motors are installed on the lifting plate, each of which is drivingly connected to one of the screw rods and is used to drive the two screw rods to rotate synchronously.

6. The acid / base solvent sampler according to claim 1, characterized in that: The second drive assembly includes a piston drive element; The piston driving element is mounted on the upper end cover of the outer sleeve, and the piston rod of the piston driving element passes through the upper end cover and is connected to the sealing ring.

7. The acid / base solvent sampler according to claim 6, characterized in that: The second drive assembly includes two sets of piston drive elements, and the two sets of piston drive elements are arranged on opposite sides of the inner sleeve.

8. The acid / base solvent sampler according to claim 1, characterized in that: The bottom of the base is detachably connected to a connecting ring, and the inner ring surface of the connecting ring is provided with an internal thread; The outer side of the mouth of the sampling bottle is provided with a circle of bosses, and the outer annular surface of the bosses is provided with external threads; The connecting ring is sleeved on the outer side of the boss, and the internal thread on the connecting ring is meshed with the external thread on the boss.

9. The acid / base solvent sampler according to claim 1, characterized in that: The lower end of the pipette is a tip; A sealing ring is arranged in the bottle mouth, and a V-shaped groove is arranged in the middle of the sealing ring for positioning the tip portion and facilitating the puncture of the tip portion.

10. The acid / base solvent sampler according to claim 1, characterized in that: The inner sleeve and the outer sleeve are both transparent sleeves, and a scale is provided on the wall of the outer sleeve.

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