CN210154989U - Liquid surface tension coefficient measuring device - Google Patents

Abstract

The utility model relates to a measure liquid surface tension's device, especially relate to a liquid surface tension coefficient measuring device. Comprises an injector, a three-way pipe fitting, a measuring tool for measuring the length, an electron microscope and a bending pipe; the injector is connected with one pipe orifice of the three-way pipe fitting through the connecting pipe, the bending pipe is connected with the other pipe orifice of the three-way pipe fitting, the electron microscope is positioned in front of the three-way pipe fitting, and the measuring tool for measuring the length is positioned on one side of the bending pipe; after a liquid film is attached to the top opening of the three-way pipe fitting, the injector is pushed to apply air pressure, bubbles are blown out from the top opening, liquid in the bending pipe forms a height difference, the height of the bubbles is measured through an electron microscope, and the height difference of the liquid in the bending pipe is measured through a measuring tool for measuring the length. The utility model discloses a little bubble's inside and outside pressure differential and bubble height and then try to get liquid surface tension coefficient, its simple structure, modern design and convenient operation have effectively solved the more and more problem of time spent of traditional measuring method liquid measure.

Description

A liquid surface tension coefficient measuring device

technical field

The utility model relates to a device for measuring liquid surface tension, in particular to a liquid surface tension coefficient measuring device.

Background technique

With the development of science and technology and people's in-depth research on physics, it has been found that the physical quantity of surface tension plays a decisive role in many cases. impact is significant.

Measuring the surface tension of liquids is an important experiment. Nowadays, the mainstream measurement methods are mainly the pull-off method and the capillary method. These two methods use a large amount of liquid. Because the preparation of reagents takes a long time, the above-mentioned measurement methods and measurement devices are used. It not only wastes a lot of reagents, increases the test cost, but also prolongs the test time.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a liquid surface tension coefficient measuring device, which effectively solves the problems that the traditional measuring method uses a large amount of liquid and the experiment takes a long time.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A liquid surface tension coefficient measuring device, comprising a syringe, a three-way pipe fitting, a measuring tool for measuring length, an electron microscope and a bending pipe; the syringe is connected with a nozzle of the three-way pipe fitting through a connecting pipe; The other nozzle is connected, the electron microscope is located in front of the three-way pipe fitting, and the measuring tool for measuring the length is located on the side of the bending pipe; after the top opening of the three-way pipe fitting is attached with a liquid film, push the syringe to apply air pressure, and the top mouth bulges out air bubbles, bending The liquid in the tube forms a height difference, the height of the bubble is measured by an electron microscope, and the length of the measuring tool is used to measure the height difference of the liquid in the bent tube.

It also includes a vertical plate, a bottom plate, a height-adjusting device and a lifting platform; the vertical plate is vertically fixed on the bottom plate, the three-way pipe fitting and the bending pipe are fixed on the vertical plate, and the measuring tool for measuring the length is fixed on the height-adjusting device. Installed on the bottom plate, the electron microscope is placed on the lifting platform, and the lifting platform is placed on the bottom plate.

The height adjusting device includes a rack, a gear, a knob, a rotating shaft and a slideway; the gear and the knob are installed on the rotating shaft, the rotating shaft is installed on the bearing, the bearing is installed on the bearing seat, and the bearing seat is installed on the bottom plate; the measuring tool for measuring the length Fixed on the rack, the gear meshes with the rack, the rack is installed on the slideway, and the slideway is fixed on the bottom plate; the knob drives the gear to rotate, which in turn drives the rack and the measuring tool fixed on the rack to go up and down the slideway slide.

The bent pipe is a U-shaped pipe.

The measuring tool for measuring the length is a vernier caliper or a spiral micrometer.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model is provided with a syringe, a three-way pipe fitting, a measuring tool for measuring length, an electron microscope and a bending tube; after a liquid film is attached to the top port of the three-way pipe fitting, the syringe is pushed to apply air pressure, the top port bulges out air bubbles, and the liquid in the bent pipe is The height difference is formed, the height of the bubble is measured by an electron microscope, and the height difference of the liquid in the bent pipe is measured by a measuring tool for measuring the length. The surface tension coefficient of the liquid is obtained through the internal and external pressure difference of the tiny bubbles and the height of the bubbles. The structure is simple, the design is novel, and the operation is convenient.

Description of drawings

1 is a schematic front view of the structure of the present utility model;

2 is a schematic side view of the structure of the present utility model;

3 is a schematic front view of the structure of the height adjusting device of the present invention;

4 is a schematic side view of the structure of the height-adjusting device of the present invention;

Figure 5 is a schematic diagram of the working principle of the present invention.

In the picture: 1- Syringe 2- Tee fittings 3- Measuring tool for measuring length 4- Electron microscope 5- Bending tube 6- Air bubble 7- Vertical plate 8- Bottom plate 9- Height adjusting device 10- Lifting platform 11- Balance ruler 12 -computer 91-rack 92-gear 93-knob 94 shaft 95-slide

Detailed ways

The specific embodiments of the present utility model will be further described below in conjunction with the accompanying drawings:

As shown in Figures 1 and 2, a liquid surface tension coefficient measuring device includes a syringe 1, a three-way pipe fitting 2, a measuring tool 3 for measuring length, an electron microscope 4, and a bending tube 5; it also includes a vertical plate 7 and a bottom plate 8 , Adjust the height device 9 and the lifting platform 10. Syringe 1 is an existing product with a size of 1 ml. The measuring tool 3 for measuring the length uses a vernier caliper. The electron microscope 4 is an existing product and adopts the HVS430W type. The lifting platform 10 is an existing product and adopts a small manual lifting platform.

The vertical plate 7 is vertically fixed to one end of the bottom plate 8 . The inner diameter of the top opening of the three-way pipe fitting 2 is 1.5mm, and the three-way pipe fitting 2 is fixed on the top of the vertical plate 7 by transparent tape. The syringe 1 is connected with a nozzle of the three-way pipe fitting 2 through a connecting pipe, the syringe 1 is placed vertically, and the injection port is downward. The bending pipe 5 is a U-shaped pipe, and the bending pipe 5 is connected with the other nozzle of the three-way pipe fitting 2 . Both the connecting pipe and the bending pipe 5 are made of transparent rubber pipes, and the connecting pipe and the bending pipe 5 are fixed on the vertical plate 7 by transparent tape.

As shown in FIGS. 3 and 4 , the height adjusting device 9 includes a rack 91 , a gear 92 , a knob 93 , a rotating shaft 94 and a slideway 95 . The gear 91 and the knob 93 are mounted on the rotating shaft 94 , the rotating shaft 94 is mounted on the bearing, the bearing is mounted on the bearing seat, and the bearing seat is mounted on the base plate 8 . The measuring tool 3 for measuring the length is fixed on the rack 91 , the gear 92 is engaged with the rack 91 , the rack 91 is installed on the slideway 95 , and the slideway 95 is fixed on the bottom plate 8 . Rotate the knob 93, the knob 93 drives the gear 92 to rotate, and the gear 92 drives the rack 91 and the length measuring tool 3 fixed on the rack 91 to slide up and down along the slideway 95, thereby adjusting the height of the length measuring tool 3.

The electron microscope 4 is located directly in front of the three-way pipe fitting 2, the electron microscope 4 is placed on the lifting platform 10, the lifting platform 10 is placed on the bottom plate 8, and a small balance ruler 11 is installed on the electron microscope 4. By adjusting the height and balance of the lifting platform 10 The ruler 11 can accurately measure the height of the bubble. The electron microscope 4 is connected to the computer 12 , and the enlarged image of the bubble can be clearly displayed on the computer 12 .

As shown in Figure 5, the working principle of the present utility model is:

这样的关系，其中气泡半径与气泡高度之间满足

a为顶口的管口半径，由U型管的水位高度差便可计算出气泡的相对内压p，最终得出表面张力系数的计算公式为：

其中ρ水的密度，g为重力加速度，d为水位高度差。The liquid with small surface tension is easy to form a bubble film, which can be inferred from the principle of virtual work: the radius r of the bubble film and the relative internal pressure p satisfy

Such a relationship, where the bubble radius and the bubble height satisfy

a is the radius of the nozzle at the top, and the relative internal pressure p of the bubble can be calculated from the height difference of the water level of the U-shaped pipe, and finally the calculation formula of the surface tension coefficient is obtained as:

where ρ is the density of water, g is the acceleration of gravity, and d is the height difference of the water level.

As shown in Figure 1 and Figure 2, the working process of the present utility model is:

To measure the liquid surface tension coefficient, first inject an appropriate amount of water into the U-shaped bent pipe 5 and drop a small amount of the liquid to be measured at the top port of the three-way pipe fitting 2 to make a layer of liquid film attached to the top port. At this time, push the syringe 1 to Apply air pressure to the inside of the liquid film to make the top mouth bulge out a bubble 6. At this time, there will be a gap between the water levels on both sides of the U-shaped bent pipe 5. Twist the knob 93 to adjust the height of the measuring tool 3 (ie the vernier caliper) for measuring the length. The mouth of the vernier caliper is at the same level with the water level on the left side of the U-shaped bent pipe 5. Loosen the knob 8 and do not move, and then adjust the mouth of the vernier caliper to make the upper mouth of the caliper and the water level on the right side of the U-shaped pipe at the same level. The reading of the vernier caliper is the height difference of the water level.

Place the electron microscope 10 on the lifting platform 9 as shown in the figure and connect it to the computer to make calibration first. After the calibration is completed, the enlarged image of the bubble is displayed on the computer, and the height value of the bubble is measured, and then the obtained value is obtained. The bubble height value and the water level height difference are substituted into the theoretical formula to calculate the surface tension coefficient of the liquid.

The utility model obtains the liquid surface tension coefficient through the internal and external pressure difference and the bubble height of the micro-bubble, and has the advantages of simple structure, novel design and convenient operation, and effectively solves the problems that the traditional measuring method uses a large amount of liquid and takes a long time.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (5)

1. a liquid surface tension coefficient measuring device, it is characterized in that: comprise syringe, three-way pipe fitting, measuring tool, electron microscope and bending pipe of measuring length; Syringe is connected with a nozzle of three-way pipe fitting by connecting pipe, and bending The tube is connected to the other nozzle of the tee fitting, the electron microscope is located in front of the tee fitting, and the measuring tool for measuring the length is located on one side of the bent tube; Bubble is blown out, and the liquid in the bent tube forms a height difference. The height of the bubble is measured by an electron microscope, and the length of the measuring tool is used to measure the liquid height difference in the bent tube. 2. A liquid surface tension coefficient measuring device according to claim 1, characterized in that: it also comprises a vertical plate, a bottom plate, a height adjusting device and a lifting platform; The elbow is fixed on the vertical plate, the measuring tool for measuring the length is fixed on the height adjustment device, the height adjustment device is installed on the bottom plate, the electron microscope is placed on the lifting platform, and the lifting platform is placed on the bottom plate. 3. A liquid surface tension coefficient measuring device according to claim 2, characterized in that: the height-adjusting device comprises a rack, a gear, a knob, a rotating shaft and a slideway; the gear and the knob are mounted on the rotating shaft, and the rotating shaft is mounted on the rotating shaft. On the bearing, the bearing is installed on the bearing seat, and the bearing seat is installed on the bottom plate; the measuring tool for measuring the length is fixed on the rack, the gear is engaged with the rack, the rack is installed on the slideway, and the slideway is fixed on the bottom plate; the knob drives the The gear rotates, and then drives the rack and the length measuring tool fixed on the rack to slide up and down along the slideway. 4. A liquid surface tension coefficient measuring device according to claim 1, wherein the bent pipe is a U-shaped pipe. 5 . A liquid surface tension coefficient measuring device according to claim 1 , wherein the measuring tool for measuring the length is a vernier caliper or a spiral micrometer. 6 .

Images