Trace moisture meter capable of automatically discharging and adding liquid

Abstract

The utility model discloses a trace moisture meter capable of automatically discharging and adding liquid, and relates to the technical field of chemical equipment. The device comprises an electrolytic tank, a reagent bottle and a moisture meter main machine, a plug hole is formed in an upper end opening of the electrolytic tank, a connecting plug with the lower portion plugged in the plug hole is arranged on the plug hole, the connecting plug comprises a plug body with the circumferential face of the lower portion being a conical face, and a detachably-installed plug cap is arranged on the upper portion of the plug body. A first sealing gasket is arranged between a top plate of the plug cap and the upper end face of the plug body, the plug body, the first sealing gasket and the plug cap are provided with a liquid adding pipe hole and a liquid discharging pipe hole correspondingly, a liquid adding pipe and a liquid discharging pipe are installed in the liquid adding pipe hole and the liquid discharging pipe hole respectively, and the liquid adding pipe and the liquid discharging pipe are tightly matched with the inner wall of the liquid adding pipe hole and the inner wall of the liquid discharging pipe hole in the first sealing gasket. According to the liquid discharging and adding mechanism disclosed by the utility model, the liquid adding pipe and the liquid discharging pipe can be mounted on the electrolytic tank through the connecting plug, and the connecting plug can be taken down and replaced by a drying pipe in a moisture measurement process, so that a sample is prevented from entering a liquid discharging and adding pipeline in the measurement process.

Description

Technical Field

[0001] This utility model relates to an automatic liquid addition and discharge micro-moisture analyzer, and pertains to the field of chemical equipment technology. Background Technology

[0002] The Karl Fischer method for moisture determination is recognized by international standards such as ISO, ASTM, DIN, and JIS as the most accurate method for moisture determination. This method is applicable to measuring the moisture content of various substances, and micro-moisture analyzers based on this principle have wide applications. However, existing micro-moisture analyzers of this type require draining and replacement of Karl Fischer reagent when excessive waste liquid accumulates in the electrolytic cell after measurement. Since Karl Fischer reagent contains toxic and harmful reagents such as pyridine, it can affect the health of testing personnel. Therefore, an automatic draining and adding device is needed to drain the waste liquid and replace the reagent.

[0003] The existing Karl Fischer moisture analyzer automatic addition and subtraction device (publication number CN20287U) connects the reaction cell to reagent bottles and waste liquid bottles via flexible tubes. Since the flexible tubes are fixedly connected to the reaction cell, both sample and reagent enter the tubes during the reaction. When reagents are changed, residual liquid in the tubes mixes with the reagents, affecting measurement accuracy. Furthermore, each tube extends into the reagent and waste liquid bottles after passing through the caps. During addition and subtraction, an air pump is needed to pressurize or depressurize the contents of the bottles. Due to the flexibility of the tubes, movement during addition and subtraction can cause them to shift at the cap connection, affecting the bottle's seal. Summary of the Invention

[0004] The purpose of this invention is to design a trace moisture analyzer that can disassemble the liquid dispensing and filling mechanism and ensures sealing during use.

[0005] This utility model includes an electrolytic cell, a reagent bottle, and a moisture analyzer main unit. The electrolytic cell has a plug hole at its upper port, and a connecting plug is installed in the plug hole. The connecting plug includes a plug body with a conical lower circumferential surface, and a detachable plug cap on the upper part of the plug body. A first sealing gasket is provided between the top plate of the plug cap and the upper end face of the plug body. The plug body, the first sealing gasket, and the plug cap are provided with corresponding inlet and outlet pipe holes, which are respectively equipped with inlet and outlet pipes. The inlet and outlet pipes are tightly fitted to the inner walls of the inlet and outlet pipe holes on the first sealing gasket. The inlet pipe is connected to the reagent bottle. The plug hole is a conical hole.

[0006] Furthermore, the reagent bottle is fitted with a cap at its mouth, and the circumference of the cap is threaded to the periphery of the reagent bottle mouth. Its top plate has a liquid addition tube hole and a pressure boosting tube hole. A support tube is respectively installed in the liquid addition tube hole and the pressure boosting tube hole, which are threaded to the inner walls of the liquid addition tube hole and the pressure boosting tube hole. The upper part of the support tube extends out of the top plate of the cap. A second sealing gasket is provided between the lower surface of the top plate of the cap and the bottle mouth. The liquid addition tube and the pressure boosting tube, which pass through the liquid addition tube hole and the pressure boosting tube hole, the cap and the second sealing gasket respectively, are tightly fitted with the second sealing gasket. The pressure boosting tube is connected to the output port of the pressure boosting pump of the moisture analyzer main unit.

[0007] Furthermore, the liquid filling pipe hole and the pressure boosting pipe hole are both reducing holes with upward stepped surfaces, and a first sealing ring is provided on the stepped surface. The support pipe is connected to the liquid filling pipe hole or the pressure boosting pipe hole above the stepped surface by threads. The liquid filling pipe and the pressure boosting pipe pass through the first sealing ring in the liquid filling pipe hole or the pressure boosting pipe hole, respectively.

[0008] Furthermore, the booster pipe is connected to the output port of the booster pump via a thread, and a reducing hole is provided at the port of the booster pipe. A second sealing ring is provided between the stepped surface formed by the reducing hole and the output port of the booster pump.

[0009] Furthermore, the cap and the circumferential surface of the plug body are connected by threads.

[0010] The liquid addition and dispensing mechanism of this invention allows the addition and dispensing pipes to be installed onto the electrolytic cell via a connecting plug. During moisture determination, the connecting plug can be removed and replaced with a drying tube to absorb moisture from the electrolytic cell, preventing the sample from entering the liquid addition and dispensing lines during measurement. A first sealing gasket is fixed above the connecting plug with a nut to ensure the electrolytic cell's airtightness during the liquid addition and dispensing process.

[0011] In this invention, a support tube is sleeved around the outer periphery of the drain pipe and the filling pipe, and is installed on the bottle cap through the support tube; the support tube plays a supporting and limiting role for the filling pipe and the drain pipe, and avoids the phenomenon that the hose will shift at the connection of the bottle cap due to the swing of the hose during the filling and draining process, thereby affecting the sealing of the bottle. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the measuring mechanism in an embodiment of the present invention;

[0013] Figure 2 A schematic diagram of the structure for installing the liquid filling and draining mechanism;

[0014] Figure 3 for Figure 2 Front view of the middle electrolytic cell section;

[0015] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0016] Figure 5 for Figure 2 Front view of the reagent bottle (full sectional view);

[0017] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0018] Figure 7 for Figure 2 Full sectional view of the waste liquid bottle from the front;

[0019] Figure 8 for Figure 2 Left view of the main unit of the moisture analyzer;

[0020] Figure 9 for Figure 8 A magnified view of a section at point C;

[0021] Figure 10 for Figure 1 Left-side full sectional view of the central drying tube;

[0022] The components are as follows: 1. Electrolytic cell, 2. Moisture analyzer main unit, 3. Control wires, 4. Reagent bottle, 5. Waste liquid bottle, 6. Plug hole, 7. Connecting plug, 8. Plug body, 9. Plug cap, 10. First sealing gasket, 11. Liquid addition tube, 12. Liquid discharge tube, 13. Bottle cap, 14. Support tube, 15. Second sealing gasket, 16. Pressure boosting tube, 17. First sealing ring, 18. Pressure reducing tube, 19. Pressure boosting pump, 20. Pressure reducing pump, 21. Pipe connector, 22. Gas inlet, 23. Second sealing ring, 24. Drying tube, 25. Air permeable layer, 26. Drying layer. Detailed Implementation

[0023] by Figure 3 Define the up, down, left, right, front, and back directions in this embodiment.

[0024] As shown in the figure, this embodiment includes an electrolytic cell 1, with a moisture meter main unit 2 located on its right side. The electrolytic cell 1 and the moisture meter main unit 2 are electrically connected via a control wire 3. In use, the moisture meter main unit 2 can control the electrolytic cell 1 to perform measurements. A plug hole 6 is provided at the upper port of the electrolytic cell 1, and the plug hole 6 is a conical hole.

[0025] A liquid discharge and addition mechanism is provided between the electrolytic cell 1 and the moisture analyzer main unit 2. The liquid discharge and addition mechanism includes a connecting plug 7, which is installed above the plug hole 6. The connecting plug 7 includes a plug body 8, the outer peripheral surface of the lower part of the plug body 8 is conical, and matches the shape of the plug hole 6. It is installed into the plug hole 6 by interference fit. In this embodiment, the plug body 8 is made of polytetrafluoroethylene, which can make the plug body 8 fit tightly with the plug hole 6 during installation. A cap 9 is provided on the top of the plug body 8. The cap 9 has a threaded hole at its lower part, allowing it to be screwed onto the upper part of the plug body 8. A first sealing gasket 10 is provided between the upper top plate of the cap 9 and the upper end face of the plug body 8. The cap 9, the first sealing gasket 10, and the plug body 8 all have interconnected filling and draining pipe holes. A filling pipe 11 and a draining pipe 12 are respectively installed in the filling and draining pipe holes. The filling and draining pipes 11 and 12 pass through the plug body 8 and extend into the inner cavity of the electrolytic cell 1. The filling pipe 11 extends to the upper part of the inner cavity of the electrolytic cell 1 to avoid contact with the liquid inside the electrolytic cell 1; the draining pipe 12 extends to the lower end face of the inner cavity of the electrolytic cell 1 to drain the liquid inside the electrolytic cell 1. During use, the filling and draining pipe holes on the first sealing gasket 3 are tightly fitted with the filling and draining pipes 11 and 12, ensuring the sealing of the inner cavity of the electrolytic cell 1.

[0026] A reagent bottle 4 is attached to the other end of the liquid addition tube 11. A cap 13 is attached to the mouth of the reagent bottle 4. A threaded hole is provided at the lower end of the cap 13. Threads corresponding to the threaded hole are provided on the outer periphery of the mouth of the reagent bottle 4. In use, the cap 13 is screwed onto the mouth of the reagent bottle 4 for fixation. A liquid addition tube hole and a pressure boosting tube hole are provided on the top plate of the cap 13. Above the liquid addition tube hole and the pressure boosting tube hole are reducing holes with upward-protruding stepped surfaces. A first sealing ring 17 is provided on the stepped surface of each reducing hole. A set of support tubes 14 is provided above the cap 13. The upper part of each support tube 14 protrudes from the cap 13, and the lower part is threaded to the upper part of the stepped surface of the liquid addition tube hole and the pressure boosting tube hole, respectively. A second sealing gasket 15 is provided between the lower surface of the top plate of the cap 13 and the mouth of the bottle. The second sealing gasket 15 has a liquid addition tube hole and a pressure boosting tube hole. A liquid addition tube 11 and a pressure boosting tube 16 are provided above the reagent bottle 4. The two flexible tubes pass through the support tubes 14 and extend into the inner cavity of the reagent bottle 4 through the liquid addition tube hole and the pressure boosting tube hole. In use, the second sealing gasket 15 fits tightly with the liquid addition tube 11 and the pressure boosting tube 16 to ensure the sealing of the inner cavity of the reagent bottle 4. At the upper end of the bottle cap 13, the support tubes 14 can support and limit the liquid addition tube 11 and the pressure boosting tube 16 to prevent the two flexible tubes from shifting at the connection point of the bottle cap 13.

[0027] A waste liquid bottle 5 is located on the right side of reagent bottle 4. A drain pipe 12 and a pressure reducing pipe 18 are installed at the upper end of the waste liquid bottle 5. The installation structure of the drain pipe 12 and the pressure reducing pipe 18 is the same as that of the bottle cap 13, and will not be described in detail here.

[0028] A booster pump 19 is located at the rear of the moisture analyzer main unit 2. Behind the booster pump 19, on the rear end plate of the moisture analyzer main unit 2, is an output port 22 corresponding to the position of the booster pump 19. The output port 22 extends forward and backward and protrudes from the rear end plate of the moisture analyzer main unit 2. The gas pipe of the booster pump 19 is fixedly connected to the front end of the output port 22, enabling the delivery of gas into the output port 22. A pipe connector 21 is located at the other end of the booster pipe 16. A reducing hole with threads is provided at the port of the pipe connector 21. The rear end of the output port 22 matches the shape of the pipe connector 21, allowing the pipe connector 21 to be screwed onto the rear end of the output port 22. A second sealing ring 23 is provided between the stepped surface formed by the reducing hole in the pipe connector 21 and the output port 22 to ensure a tight seal at the connection. In use, starting the booster pump 19 pressurizes the gas delivered to the reagent bottle 4, allowing the reagent to be delivered to the electrolytic cell through the liquid addition pipe 11. Below the booster pump 19 is a depressurizing pump 20, which is connected to the depressurizing pipe 18. Its connection structure is the same as that of the output port 22, and will not be described in detail here. In use, starting the depressurizing pump 20 depressurizes the gas in the waste liquid bottle 5, and then draws the liquid from the electrolytic cell 1 into the waste liquid bottle 5 through the drain pipe 12. In this embodiment, the moisture analyzer main unit 2 is electrically connected to the booster pump 19 and the depressurizing pump 20, and can control the start and stop of the two pumps through the moisture analyzer main unit 2.

[0029] In this embodiment, a drying tube 24 is provided, with a breathable layer 25 and a drying layer 26 on the upper part of the drying tube 24. This is an existing structure and will not be described in detail here. The lower end of the drying tube 24 is tapered, matching the shape of the plug hole 6, and can be installed into the plug hole 6 by interference fit. During the measurement process, the drying tube 24 is inserted into the plug hole 6 to absorb moisture in the electrolytic cell 1, ensuring the accuracy of the measurement.

[0030] In this embodiment, when there is excessive waste liquid in the electrolytic cell and it needs to be drained, first remove the drying tube 24, and insert the connecting plug 7 into the plug hole 6 through an interference fit. Then, connect the boosting tube 16 and the depressurizing tube 18 to the boosting pump 19 and the depressurizing pump 20 respectively through the pipe connector 21. After completion, start the depressurizing pump 20 to extract the gas from the waste liquid bottle 5 to reduce the pressure, and pump the waste liquid in the electrolytic cell 1 into the waste liquid bottle 5 through the drain pipe 12. After the waste liquid is extracted, turn off the depressurizing pump 20, and then turn on the boosting pump 19 to deliver gas to the reagent bottle 4 for pressurization. The reagent in the reagent bottle 4 is then delivered to the electrolytic cell 1 through the liquid addition pipe 11 to complete the reagent replacement. After the reagent delivery is completed, turn off the boosting pump 19, remove the connecting plug 7, and insert the drying tube 24 into the plug hole 6 through an interference fit to continue measuring the sample.

Claims

1. An automatic liquid dispensing and adding micro-moisture analyzer, comprising an electrolytic cell, a reagent bottle, and a moisture analyzer main unit, wherein the electrolytic cell has a plug hole at its upper port, characterized in that: A connecting plug is provided on the plug hole, the connecting plug including a plug body with a conical lower circumferential surface, a detachable plug cap on the upper part of the plug body, a first sealing gasket between the top plate of the plug cap and the upper end face of the plug body, the plug body, the first sealing gasket and the plug cap having corresponding liquid inlet and liquid outlet holes, respectively, which are fitted with liquid inlet and liquid outlet pipes, and the liquid inlet and liquid outlet pipes are tightly fitted with the inner walls of the liquid inlet and liquid outlet holes on the first sealing gasket; the liquid inlet pipe is connected to the reagent bottle; the plug hole is a conical hole.

2. The automatic liquid addition and dispensing trace moisture analyzer according to claim 1, characterized in that: The reagent bottle has a cap at its mouth, and the circumference of the cap is threaded to the periphery of the reagent bottle mouth. Its top plate has a liquid addition tube hole and a pressure boosting tube hole. A support tube is installed in the liquid addition tube hole and the pressure boosting tube hole respectively, and is threaded to the inner wall of the liquid addition tube hole and the pressure boosting tube hole. The upper part of the support tube extends out of the top plate of the cap. A second sealing gasket is installed between the lower surface of the top plate of the cap and the bottle mouth. The liquid addition tube and the pressure boosting tube pass through the liquid addition tube hole and the pressure boosting tube hole, the cap and the second sealing gasket respectively, and are tightly fitted with the second sealing gasket. The pressure boosting tube is connected to the output port of the pressure boosting pump of the moisture analyzer main unit.

3. The automatic liquid addition and dispensing trace moisture analyzer according to claim 2, characterized in that: The liquid filling pipe hole and the pressure boosting pipe hole are both reducing holes with upward stepped surfaces. A first sealing ring is provided on the stepped surface. The support pipe is connected to the liquid filling pipe hole or the pressure boosting pipe hole above the stepped surface by threads. The liquid filling pipe and the pressure boosting pipe pass through the first sealing ring in the liquid filling pipe hole or the pressure boosting pipe hole, respectively.

4. The automatic liquid addition and dispensing trace moisture analyzer according to claim 3, characterized in that: The booster pipe is connected to the output port of the booster pump via a thread. A reducing hole is provided at the port of the booster pipe, and a second sealing ring is provided between the stepped surface formed by the reducing hole and the output port of the booster pump.

5. The automatic liquid addition and dispensing trace moisture analyzer according to claim 1, 2, or 3, characterized in that: The cap is connected to the circumference of the plug body by threads.

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