Air control liquid level type liquid surface tension coefficient measurement experimental device

Abstract

The utility model discloses an air control liquid level type liquid surface tension coefficient measurement experimental device which comprises a bottom plate, a vertical rod, a vertical column, a transverse rod, a force sensor, a tray and glassware, wherein the vertical rod and the vertical column are mounted on the bottom plate; the transverse rod is adjustably mounted on the vertical rod; the force sensor is mounted on the transverse rod; the device is characterized in that a glass bottle is connected to the glassware; and the glass bottle is connected with a pressure balloon for controlling the liquid in the glassware to rise and fall and a deflation valve arranged on the pressure balloon. By adjusting the deflation valve on the pressure balloon, the pressure in the glass bottle is reduced during deflation, and liquid in the glassware flows back into the glass bottle, so that the liquid level in the glassware stably descends, the liquid level does not fluctuate during descending, the measurement accuracy is improved, and the measurement repeatability is good; liquid in the glassware and the glass bottle can be replaced through the tee joint with the valve, so that different liquids can be conveniently replaced for experiments, the experiment range is expanded, and the environment is not polluted.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching experiment devices, in particular to an experimental device for measuring the surface tension coefficient of liquid by air-controlled liquid level. Background Technique

[0002] In many fields, the surface tension of liquids is often involved, which is a unique property and phenomenon of liquids. For example, in industries such as liquid transmission, drug preparation, and in the research fields of biological engineering regarding the movement and balance of liquids in animals and plants. Therefore, understanding the surface properties and phenomena of liquids and mastering the methods for measuring the surface tension coefficient of liquids have very important practical significance. The common methods for measuring the surface tension coefficient of liquids usually include: the pull-off method, the capillary rise method, and the drop weighing method, etc.; and the pull-off method is the most commonly used measurement method. That is, a clean cylindrical hanging ring is immersed in the liquid, and then the hanging ring is slowly lifted. The cylindrical hanging ring will bring up a liquid film, and the surface tension f that causes the liquid surface to contract is along the tangent direction of the liquid surface. The angle Φ is called the wetting angle (or contact angle). When the cylindrical hanging ring is continuously lifted, the angle Φ gradually becomes smaller and approaches zero. At this time, the tensions f on the inner and outer surfaces of the pulled liquid film are both perpendicular downward. The pulling force when the liquid film is pulled and broken (the peak pulling force at the moment when the hanging ring breaks the liquid surface) is F.

[0003] A common method to make the hanging ring break the liquid surface is to place the liquid-containing glassware on a platform that can be adjusted in height by a screw. Rotate the screw, and the platform together with the liquid-containing container descends, while the hanging ring remains stationary and the liquid level continuously drops, finally achieving the purpose of the hanging ring breaking the liquid surface. Its disadvantage is that when the liquid-containing container descends with the rotation of the screw, the liquid surface also sways and fluctuates. Therefore, the measurement accuracy is low, the error is large, and the repeatability is poor. For this reason, an experimental device for measuring the surface tension coefficient of liquid by air-controlled liquid level is proposed to improve the measurement accuracy and reduce the experimental error. Summary of the Invention

[0004] The purpose of the utility model is to propose an experimental device for measuring the surface tension coefficient of liquid by air-controlled liquid level to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An experimental device for measuring the surface tension coefficient of liquid by air-controlled liquid level, including a bottom plate, a vertical rod and a column installed on the bottom plate, a cross bar that can be adjustably installed on the vertical rod, a force-sensitive sensor installed on the cross bar, a tray placed on the column, and a glassware placed on the tray; it is characterized in that a glass bottle is connected to the glassware; a pressure balloon for controlling the rise and fall of the liquid in the glassware and a built-in air release valve on the pressure balloon are connected to the glass bottle.

[0006] Preferably, glass nozzles are provided on the lower sides of both the glass bottle and the glassware; the glass nozzles are connected by a connecting rubber tube.

[0007] Preferably, the glass bottle is provided with a bottle stopper; and the bottle stopper is provided with a glass tube.

[0008] Preferably, a soft air tube is connected between the glass tube and the compressed air ball.

[0009] Preferably, it also includes a tee with a valve installed on the connecting hose between the glass nozzles to facilitate the replacement of the liquid.

[0010] Preferably, a hook is installed on the force-sensitive sensor; a barrel-shaped ring and a thin wire suspending the barrel-shaped ring are suspended on the hook.

[0011] Preferably, the force sensitive sensor is also connected to a measuring instrument.

[0012] Preferably, the base plate is also provided with a plurality of base screws and a leveling bubble to ensure that the base plate is level.

[0013] The beneficial effects of the utility model are as follows: by rotating the deflation valve on the pressure ball, the pressure in the glass bottle is increased by squeezing the pressure ball, and the liquid level in the glassware is steadily increased; by slightly rotating the deflation valve to deflate, the pressure in the glass bottle is reduced during deflation, and the liquid in the glassware gradually flows back into the glass bottle, so that the liquid level in the glassware is steadily lowered, and no fluctuation occurs when the liquid level is lowered, thereby improving the accuracy of measurement and achieving good measurement repeatability;

[0014] By using a tee with a valve, the liquid in the glassware and glass bottle can be replaced, making it easy to replace different liquids for experiments, thereby expanding the scope of the experiment. At the same time, the liquid can also be collected in a unified manner without polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Legend: 1. Base plate; 2. Vertical pole; 3. Horizontal pole; 4. Force sensor; 5. Tray; 6. Vertical column; 7. Hook; 8. Thin wire; 9. Barrel-shaped lifting ring; 11. Glassware; 12. Connecting hose; 13. Bottle stopper; 14. Glass tube; 15. Glass bottle; 16. Glass nozzle; 17. Soft air tube; 18. Air release valve; 19. Ball pressure ball; 20. Level bubble; 21. Base screw; 22. Tee with valve; 23. Measuring instrument. DETAILED DESCRIPTION

[0017] Next, we will further explain the gas-controlled liquid level type liquid surface tension coefficient measurement experimental device described in the present invention with reference to the accompanying drawings.

[0018] It should be noted that all the directional indicators in the embodiments of the present invention, such as up, down, left, right, front, back... are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the attached drawings. If the specific posture changes, the directional indicators will change accordingly.

[0019] Referring to the attached drawings, an experimental device for measuring the liquid surface tension coefficient of a pneumatically controlled liquid level type in this embodiment includes a bottom plate 1, a vertical rod 2 and a column 6 installed on the bottom plate 1, a cross bar 3 adjustably installed on the vertical rod 2, a force sensitive sensor 4 installed on the cross bar 3, a tray 5 placed on the column 6, and a glassware 11 placed on the tray 5. It is characterized in that a glass bottle 15 is connected to the glassware 11; a pressure balloon 19 for controlling the liquid level rise and fall in the glassware 11 and a built-in air release valve 18 on the pressure balloon 19 are connected to the glass bottle 15; by rotating and adjusting the built-in air release valve 18 on the pressure balloon 19 and squeezing the balloon 19, the pressure in the glass bottle 15 is increased and the liquid level in the glassware 11 rises smoothly; slightly rotating the air release valve 18 to release air, when releasing air, the pressure in the glass bottle 15 is reduced, and the liquid in the glassware 11 gradually flows back into the glass bottle 15, making the liquid level in the glassware 11 drop smoothly without fluctuations when the liquid level drops, improving the measurement accuracy and having good measurement repeatability.

[0020] Referring to the attached drawings, glass nozzles 16 are provided on the lower sides of both the glass bottle 15 and the glassware 11; the glass nozzles 16 are connected by a connecting rubber tube 12; a bottle stopper 13 is installed on the glass bottle 15; a glass tube 14 is inserted into the bottle stopper 13; a flexible tube 17 is connected between the glass tube 14 and the pressure balloon 19; by connecting the glass nozzles 16 on the glass bottle 15 and the glassware 11 with the connecting rubber tube 12, it is convenient for the liquid to flow between the glass bottle 15 and the glassware 11.

[0021] Referring to the attached drawings, it further includes a valve - equipped tee 22 installed on the connecting rubber tube 12 between the glass nozzles 16 for facilitating liquid replacement; by using the valve - equipped tee 22, the liquid in the glassware 11 and the glass bottle 15 can be replaced, thus facilitating the experiment with different liquids, expanding the scope of the experiment, and at the same time, the liquid can be collected uniformly without polluting the environment.

[0022] Referring to the attached drawings, a hook 7 is installed on the force sensitive sensor 4; a cylindrical hanging ring 9 and a thin line 8 suspending the cylindrical hanging ring 9 are suspended by the hook 7; a measuring instrument 23 is also connected to the force sensitive sensor 4.

[0023] As shown in the accompanying drawings, the base plate 1 is also equipped with a plurality of base screws 21 and a level bubble 20 to ensure that the base plate 1 is level. The level bubble 20 is used to ensure that the base plate 1 is in a horizontal state after adjustment by the base screws 21, thereby ensuring that the liquid level in the glass vessel 11 is in a horizontal state, thereby improving the accuracy of the experiment.

[0024] The experimental process of the utility model is as follows: first, tighten the deflation valve 18 on the pressure balloon 19, squeeze the pressure balloon 19 several times, and inflate the glass bottle 15. The air pressure presses the liquid in the glass bottle 15 to the glass container 11 through the connecting hose 12, so that the liquid level in the glass container 11 rises. Then, the barrel-shaped ring 9 is hung on the hook 7 through the thin wire 8 so that the barrel-shaped ring 9 is in a horizontal state. Then, the crossbar 3 is adjusted to the column position so that the liquid in the glass container 11 immerses the barrel-shaped ring 9.

[0025] During measurement, the air release valve 18 of the pressure ball 19 is very slowly adjusted to release air, so that the air pressure in the glass bottle 15 is slowly reduced, causing the air in the glass container 11 to flow back into the glass bottle 15 along the connecting hose 12, causing the liquid level in the glass container 11 to slowly drop. Relatively speaking, the barrel-shaped ring 9 is pulled upward. When the barrel-shaped ring 9 breaks the liquid surface and leaves the liquid surface, the force-sensitive sensor 4 measures the maximum tension at the moment. The measuring instrument 23 displays the peak value of the tension and keeps the data. Then, the surface tension coefficient of the liquid is calculated.

[0026] The valved tee 22 is connected to the glass vessel 11 and the glass bottle 15 through the connecting hose 12. By adjusting the state of the valved tee 22, the amount of liquid in the glass vessel 11 or the glass bottle 15 can be discharged, and different liquids can be changed for measurement.

[0027] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the scope of protection of the present invention.

Claims

1. An experimental device for measuring the surface tension coefficient of a liquid by air-controlled liquid level, comprising a bottom plate (1), a vertical rod (2) and a column (6) installed on the bottom plate (1), a cross bar (3) adjustably installed on the vertical rod (2), a force-sensitive sensor (4) installed on the cross bar (3), a tray (5) placed on the column (6), and a glassware (11) placed on the tray (5); characterized in that A glass bottle (15) is connected to the glassware (11); a pressure balloon (19) for controlling the liquid level in the glassware (11) and a built-in air release valve (18) on the pressure balloon (19) are connected to the glass bottle (15).

2. The experimental device for measuring the liquid surface tension coefficient by pneumatic control of liquid level according to claim 1, characterized in that: Glass nozzles (16) are provided on the lower sides of both the glass bottle (15) and the glassware (11); the glass nozzles (16) are connected by a connecting rubber tube (12).

3. The experimental device for measuring the liquid surface tension coefficient by air-controlled liquid level according to claim 2, wherein: A bottle stopper (13) is installed on the glass bottle (15); a glass tube (14) is inserted into the bottle stopper (13).

4. The experimental device for measuring the liquid surface tension coefficient by air-controlled liquid level according to claim 3, characterized in that: A flexible hose (17) is connected between the glass tube (14) and the pressure balloon (19).

5. The experimental device for measuring the liquid surface tension coefficient by air-controlled liquid level according to claim 2, wherein: It further includes a three-way valve (22) with a valve installed on the connecting rubber tube (12) between the glass nozzles (16) for facilitating liquid replacement.

6. The experimental device for measuring the liquid surface tension coefficient by air-controlled liquid level according to claim 1, wherein: A hook (7) is installed on the force-sensitive sensor (4); a cylindrical hanging ring (9) and a thin line (8) for suspending the cylindrical hanging ring (9) are suspended on the hook (7).

7. An experimental device for measuring the liquid surface tension coefficient by air-controlled liquid level, as described in claim 6, wherein: A measuring instrument (23) is also connected to the force-sensitive sensor (4).

8. The experimental device for measuring the liquid surface tension coefficient with air-controlled liquid level according to claim 1, characterized in that: A number of bottom foot screws (21) and a spirit level (20) for ensuring the level of the bottom plate (1) are installed on the bottom plate (1).

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