A nitrogen protection device suitable for a burette

Abstract

A nitrogen protection device for a Buchner funnel includes a top cover, a filtration mechanism, a nitrogen injection mechanism, and a sealing mechanism. The filtration mechanism, nitrogen injection mechanism, and sealing mechanism are all mounted on the top cover. The top cover presses against the top surface of the Buchner funnel, and the sealing mechanism presses against the outer circumferential wall of the Buchner funnel. The top cover is made of quartz glass. This invention effectively protects the sample from oxidation and moisture by using nitrogen.

Description

Technical Field

[0001] This utility model relates to a nitrogen protection device, and more particularly to a device that can protect the sample inside the Buchner funnel from oxidation and moisture during filtration with nitrogen, belonging to the technical field of nitrogen protection equipment for Buchner funnels. Background Technology

[0002] In chemical experiments or materials preparation, solid-liquid separation of oxygen-sensitive substances is often required. Traditional vacuum filtration apparatus consists of a Buchner funnel and a filtration flask. The Buchner funnel is directly exposed to air, which can easily lead to sample oxidation or moisture absorption, affecting experimental results. Although existing technologies include nitrogen protection cabinets or complex sealing systems, these suffer from problems such as complex structure, high cost, and poor compatibility with conventional equipment. Laboratory operations require strong adaptability and ease of operation. Therefore, there is a need for a device that can achieve this goal without modifying existing filtration flasks and Buchner funnels, thereby ensuring that the sample inside the Buchner funnel is subject to minimal oxidation and moisture absorption. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a nitrogen protection device suitable for Buchner funnels, which can effectively reduce the degree of oxidation and moisture absorption of samples inside the Buchner funnel.

[0004] The problem described in this utility model is solved by the following technical solution:

[0005] A nitrogen protection device for a Buchner funnel includes a top cover, a filtration mechanism, a nitrogen injection mechanism, and a sealing mechanism; the filtration mechanism, nitrogen injection mechanism, and sealing mechanism are all disposed on the top cover; the top cover presses against the top surface of the Buchner funnel, and the sealing mechanism presses against the outer circumferential wall of the Buchner funnel; the top cover is made of quartz glass.

[0006] The above-described nitrogen protection device for a Buchner funnel includes a filtration mechanism comprising a plumb rod, a conical plug, and a pressure rod. The top cover has a central hole with a sealing ring on its inner wall, the sealing ring being made of fluororubber. The plumb rod passes through the sealing ring in the central hole of the top cover and is made of a nickel-based alloy. The conical plug is positioned on the side wall of the plumb rod with its smaller end facing downwards. The outer diameter of the lowest point of the conical plug is smaller than the inner diameter of the sealing ring, and the outer diameter of the highest point of the conical plug is larger than the outer diameter of the sealing ring. The conical plug is made of fluororubber. The bottom end of the plumb rod has a horizontal hole, and the pressure rod passes through this horizontal hole. The pressure rod is made of a nickel-based alloy.

[0007] The above-mentioned nitrogen protection device for Buchner funnel includes a sealing mechanism comprising an annular baffle, a hollow elastic tube, and a valve core. The annular baffle is disposed on the bottom end face of the top cover, and its inner diameter is larger than the outer diameter of the Buchner funnel. The hollow elastic tube is adhered to the inner wall of the annular baffle by polyurethane adhesive, and its inner diameter is larger than the outer diameter of the Buchner funnel. The hollow elastic tube is made of fluororubber. A valve core is disposed on the side wall of the hollow elastic tube, and a perforation is provided on the top cover, through which the valve core passes.

[0008] The nitrogen protection device applicable to the Buchner funnel described above includes a nitrogen injection mechanism comprising an annular tube, a first pair of connecting pipes, a second pair of connecting pipes, and a valve. The annular tube is located at the center of the bottom end face of the top cover and is made of polytetrafluoroethylene (PTFE). A ring of air jet holes is provided at the bottom end of the annular tube. The first pair of connecting pipes is located on the top cover and has a quick connector at its top. The bottom end of the first pair of connecting pipes communicates with the cavity inside the annular tube. The second pair of connecting pipes is located on the top cover and its bottom end is flush with the bottom end face of the top cover. The valve is located at the top end of the second pair of connecting pipes.

[0009] This invention accelerates sample filtration on filter paper through a filtration-promoting mechanism, speeds up the passage of liquid through the filter paper, and allows the sample to separate from the holding reagent as quickly as possible; the nitrogen spraying mechanism surrounds the sample with nitrogen gas, reducing the impact of oxygen and moisture on the sample; and the sealing mechanism ensures that the nitrogen gas sprayed by the nitrogen spraying mechanism can be reliably retained in the inner cavity of the Buchner funnel. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a downward angle;

[0011] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention at an elevation angle.

[0012] The list of labels in the diagram is as follows: 1. Top cover, 2. Vertical rod, 3. Conical plug, 4. Pressure rod, 5. Annular baffle, 6. Hollow elastic tube, 7. Valve core, 8. Annular tube, 9. First pair of connecting pipes, 10. Second pair of connecting pipes, 11. Valve. Detailed Implementation

[0013] See Figure 1 and Figure 2 This utility model includes a top cover 1, a filtration mechanism, a nitrogen spraying mechanism, and a sealing mechanism; the filtration mechanism, the nitrogen spraying mechanism, and the sealing mechanism are all disposed on the top cover 1; the top cover 1 presses against the top surface of the Buchner funnel, and the sealing mechanism presses against the outer circumferential wall of the Buchner funnel; the top cover 1 is made of quartz glass, which has the characteristics of corrosion resistance and transparency. On the one hand, it can prevent corrosion to a certain extent, and on the other hand, it is transparent, so the staff can directly see the filtration status of the sample above the filter paper.

[0014] The filtration mechanism includes a vertical rod 2, a conical plug 3, and a pressure rod 4. The top cover 1 has a central hole with a sealing ring on its inner wall. The sealing ring is made of fluororubber. Fluororubber has excellent high-temperature resistance, chemical corrosion resistance, and oil resistance, and can be used in various media, such as concentrated sulfuric acid, nitric acid, phosphoric acid, and caustic soda. Fluororubber seals are ideal materials for manufacturing various chemically resistant seals. The vertical rod 2 passes through the sealing ring in the central hole of the top cover 1, and the vertical rod 2 is made of a nickel-based alloy. This type of alloy, with nickel as its main component, has excellent high-temperature resistance and corrosion resistance. The conical plug 3 is... On the side wall of the plumb rod 2, with its small end facing downwards, the outer diameter of the lowest end of the conical plug 3 is smaller than the inner diameter of the sealing ring, and the outer diameter of the highest end of the conical plug 3 is larger than the outer diameter of the sealing ring. The material of the conical plug 3 is fluororubber. When the conical plug 3 blocks the sealing ring downwards, a good seal can be achieved. The bottom end of the plumb rod 2 is provided with a hole in the horizontal direction, and the pressure rod 4 passes through the horizontal hole at the bottom end of the plumb rod 2. The material of the pressure rod 4 is nickel-based alloy. The operator can operate the plumb rod 2 to drive the pressure rod 4 to move vertically. By rotating and moving the pressure rod up and down in the Buchner funnel, the separation of the sample and the protective reagent can be accelerated, and the filtration of the reagent can be accelerated.

[0015] The sealing mechanism includes an annular baffle 5, a hollow elastic tube 6, and a valve core 7. The annular baffle 5 is disposed on the bottom end face of the top cover 1, and its inner diameter is larger than the outer diameter of the Buchner funnel. This ensures that the annular baffle 5 can be fitted onto the top of the outer wall of the Buchner funnel. The hollow elastic tube 6 is adhered to the inner wall of the annular baffle 5 by polyurethane adhesive. Polyurethane adhesive has good adhesion to fluororubber and quartz glass, has a certain degree of elasticity and flexibility, can withstand a certain degree of deformation and vibration, and has good chemical corrosion resistance. The inner diameter of the hollow elastic tube 6 is larger than the outer diameter of the Buchner funnel. The hollow elastic tube 6 is made of fluororubber. When air is introduced into the hollow elastic tube 6, its expansion seals the gap between the annular baffle 5 and the Buchner funnel, thus achieving a sealing effect and ensuring that nitrogen is reliably retained in the Buchner funnel. A valve core 7 is provided on the side wall of the hollow elastic tube 6, and a perforation is provided on the top cover 1. The valve core 7 passes through the perforation on the top cover 1. The operator uses an air pump to inflate the valve core 7, which causes the hollow elastic tube 6 to expand, thereby sealing the gap between the annular baffle and the Buchner funnel, achieving a sealing effect.

[0016] The nitrogen spraying mechanism includes an annular tube 8, a first pair of connecting pipes 9, a second pair of connecting pipes 10, and a valve 11. The annular tube 8 is located at the center of the bottom end face of the top cover 1. The material of the annular tube 8 is polytetrafluoroethylene (PTFE), which has good corrosion resistance. A ring of air jet holes is provided at the bottom end of the annular tube 8. When nitrogen is injected into the annular tube 8, the nitrogen is sprayed downwards through the air jet holes at the bottom end of the annular tube 8 to surround the sample, thereby isolating oxygen and water vapor. The first pair of connecting pipes 9 is located on the top cover 1, and a quick connector is provided at its top end. The bottom end of the first pair of connecting pipes 9 is connected to the cavity inside the annular tube 8. The nitrogen source can be connected to the quick connector at the top end of the first pair of connecting pipes 9 to release nitrogen. The second pair of connecting pipes 10 is located on the top cover 1, and its bottom end is flush with the bottom end face of the top cover 1. The valve 11 is located at the top end of the second pair of connecting pipes 10.

[0017] Operating principle: After connecting the Buchner funnel and its matching equipment, pour the sample and mixed solvent into the Buchner funnel, then cover it with the top cover 1. Use an air pump to inflate the valve core, causing the hollow elastic tube 6 to expand until it seals the gap between the annular baffle 5 and the Buchner funnel. Then, connect the quick connector of the nitrogen source tube to the quick connector of the first pair of connecting tubes 9 and inject nitrogen for five to ten seconds to expel the air from the Buchner funnel. Then, close valve 11 and begin the Buchner funnel filtration process. During this process, the plumb rod 2 can be manually operated to rotate or press the pressure rod 4 inside the Buchner funnel in the solvent, accelerating the filtration of the solvent. After the solvent filtration is complete, turn off the nitrogen source switch, release the air from the valve core, then remove the top cover, filter paper, and the sample on it. Thus, the sample in the Buchner funnel has received sufficient nitrogen protection during the filtration process.

Claims

1. A nitrogen protection device suitable for Buchner funnels, characterized in that: It includes a top cover (1), a filtration mechanism, a nitrogen spraying mechanism, and a sealing mechanism; the filtration mechanism, the nitrogen spraying mechanism, and the sealing mechanism are all located on the top cover (1); the top cover (1) presses against the top surface of the Buchner funnel, and the sealing mechanism presses against the outer circumferential wall of the Buchner funnel; the material of the top cover (1) is quartz glass.

2. The nitrogen protection device for Buchner funnel according to claim 1, characterized in that: The filtration mechanism includes a vertical rod (2), a conical plug (3), and a pressure rod (4); the top cover (1) has a hole in the center, and a sealing ring is provided on the inner wall of the hole, and the sealing ring is made of fluororubber; the vertical rod (2) passes through the sealing ring in the center hole of the top cover (1), and the vertical rod (2) is made of nickel-based alloy; the conical plug (3) is provided on the side wall of the vertical rod (2), with its small end facing down, the outer diameter of the lowest end of the conical plug (3) is smaller than the inner diameter of the sealing ring, and the outer diameter of the highest end of the conical plug (3) is larger than the outer diameter of the sealing ring, and the conical plug (3) is made of fluororubber; the bottom end of the vertical rod (2) has a hole along the horizontal direction, and the pressure rod (4) passes through the horizontal hole at the bottom end of the vertical rod (2), and the pressure rod (4) is made of nickel-based alloy.

3. The nitrogen protection device for Buchner funnel according to claim 2, characterized in that: The sealing mechanism includes an annular baffle (5), a hollow elastic tube (6), and a valve core (7); the annular baffle (5) is disposed on the bottom end face of the top cover (1), and its inner diameter is larger than the outer diameter of the Buchner funnel; the hollow elastic tube (6) is adhered to the inner wall of the annular baffle (5) by polyurethane adhesive, and the inner diameter of the hollow elastic tube (6) is larger than the outer diameter of the Buchner funnel; the material of the hollow elastic tube (6) is fluororubber; a valve core (7) is disposed on the side wall of the hollow elastic tube (6), and a perforation is disposed on the top cover (1), and the valve core (7) passes through the perforation on the top cover (1).

4. The nitrogen protection device for Buchner funnel according to claim 3, characterized in that: The nitrogen spraying mechanism includes an annular tube (8), a first pair of connecting pipes (9), a second pair of connecting pipes (10), and a valve (11). The annular tube (8) is located at the center of the bottom end face of the top cover (1). The material of the annular tube (8) is polytetrafluoroethylene. A ring of air jet holes is provided at the bottom end of the annular tube (8). The first pair of connecting pipes (9) is located on the top cover (1) and has a quick connector at its top end. The bottom end of the first pair of connecting pipes (9) is connected to the cavity inside the annular tube (8). The second pair of connecting pipes (10) is located on the top cover (1) and its bottom end is flush with the bottom end face of the top cover (1). The valve (11) is located at the top end of the second pair of connecting pipes (10).

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