CN211529448U

CN211529448U - Buoyancy generation reason demonstration device

Info

Publication number: CN211529448U
Application number: CN202020491553.2U
Authority: CN
Inventors: 代伟; 黄军; 江敏; 罗洁
Original assignee: China West Normal University
Current assignee: China West Normal University
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-09-18
Anticipated expiration: 2030-04-07

Abstract

The utility model discloses a buoyancy generation cause demonstration device, relating to the field of physical experiment devices, comprising a water tank, a buoyancy testing device and five pressure display devices; the top of the water tank is provided with an opening, and one side surface of the water tank is provided with a mounting hole; the buoyancy testing device comprises a square box, the square box is of a hollow cubic structure with an opening on one surface, the centers of the other five surfaces of the square box are respectively connected with a glass tube, and one end of the glass tube, which is far away from the square box, is fixedly covered with a rubber film; the pressure display device comprises a U-shaped glass tube and a graduated scale, and the graduated scale is arranged in the center of the U-shaped glass tube; the square box is arranged in the mounting hole in a sealing mode, the open end of the square box faces the outside of the water tank, the square box further comprises five latex tubes, and the inner cavity of each U-shaped glass tube is communicated with the inner cavity of one glass tube through one latex tube. The demonstration device can intuitively demonstrate the stress condition of each side surface of an object immersed in liquid, and better help students to know and understand the reason of buoyancy.

Description

Buoyancy generation reason demonstration device

Technical Field

The utility model relates to a physics experimental apparatus field specifically is a reason presentation device that buoyancy produced.

Background

Buoyancy is an important knowledge point in junior middle school physics teaching, when an object is immersed in liquid, the pressure exerted by the liquid on each side surface of the object at the same depth is equal, the directions are opposite, and the acting forces are mutually offset and balanced; however, the pressure on the upper surface and the lower surface of the object is unequal, the upward pressure on the lower surface of the object is greater than the downward pressure on the upper surface of the object, and the object immersed in the liquid is subjected to buoyancy due to the pressure difference between the upper surface and the lower surface of the object.

At present, most junior middle school physics teachers put a table tennis ball into a beverage bottle with the bottom cut off when demonstrating the reason of buoyancy generation in practical teaching. Inverting the bottle, taking down the cover of the beverage bottle, pouring water into the bottle, stopping the table tennis ball at the lower part of the bottle mouth and preventing the table tennis ball from floating upwards so as to demonstrate that the table tennis ball is not subjected to buoyancy; the cover of the beverage bottle is covered, water is poured into the bottle, and when the lower part of the table tennis is also full of water, the soldier can float upwards immediately, so that the table tennis is demonstrated to be subjected to upward buoyancy. In this demonstration, the teacher can only explain the cause of the buoyancy: when the cover is not covered, the soldier table tennis is not subjected to buoyancy because the acting force of liquid on each side surface of the soldier table tennis is equal and mutually counteracted, the buoyancy is not influenced, at the moment, the liquid on the soldier table tennis has a powerful effect on the soldier table tennis, but the air below the table tennis has no liquid, so that the liquid below the soldier table tennis does not generate the acting force on the soldier table tennis, and the table tennis cannot float upwards; when the bottle cap is covered with the table tennis ball, the acting force of each side of the table tennis ball is unchanged, but the liquid is quickly collected under the table tennis ball after the bottle cap is covered with the table tennis ball, and the acting force applied to the lower surface of the table tennis ball is greater than the acting force applied to the upper surface of the table tennis ball, so that the table tennis ball floats at this time.

However, in the teaching process, students cannot intuitively understand what reason causes the object immersed in the liquid to generate buoyancy, and whether the acting force on each side surface of the object is equal and pressure difference exists between the upper surface and the lower surface as the teacher says; the whole demonstration experiment process cannot enable students to have visual feeling on the reasons of buoyancy generation, and the teaching quality is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provides a reason presentation device that buoyancy produced, but each side atress situation of audio-visual demonstration submergence object in liquid, better help student's understanding and understanding the reason that buoyancy produced.

The purpose of the utility model is realized through the following technical scheme:

a buoyancy generation reason demonstration device comprises a water tank, a buoyancy testing device and five pressure display devices;

the top of the water tank is provided with an opening, and one side surface of the water tank is provided with an installation opening;

the buoyancy testing device comprises a square box, the square box is of a hollow cubic structure with an opening on one surface, communication holes are formed in the center positions of the other five surfaces of the square box, glass tubes are connected to the outer sides of the square box, the inner cavities of the glass tubes are communicated with the inner cavity of the square box through the communication holes, and one end, away from the square box, of each glass tube is fixedly covered with a rubber film;

the pressure display device comprises a vertical plate support, wherein a U-shaped glass tube and a graduated scale are fixedly arranged on one side of the vertical plate support, and the graduated scale is arranged in the center of the U-shaped glass tube;

the square body box is arranged in the mounting hole in a sealing mode, the open end of the square body box faces the outside of the water tank, the square body box further comprises five latex tubes, and each inner cavity of the U-shaped glass tube is communicated with one inner cavity of the glass tube through one latex tube.

Further, the cube box can slide in the mounting opening.

Further, the square box is arranged in the mounting port, and the pressure display devices communicated with the glass tubes on the top surface and the bottom surface of the square box are arranged side by side, and the other three pressure display devices are arranged side by side.

The utility model has the advantages that:

the buoyancy generation reason demonstration device mainly comprises a water tank, a buoyancy testing device and a pressure display device, can intuitively demonstrate stress conditions of all sides of an object immersed in liquid, and better helps students to know and understand the buoyancy generation reasons. The pressure display device and the buoyancy testing device are connected through the latex tube made of flexible materials, and when the experiment demonstration is carried out, the position of the pressure display device can be adjusted randomly, so that the student can observe the pressure display device conveniently. The pressure display device is provided with the graduated scale, and students can directly visually observe and accurately record pressure through the reading of the liquid level of the coating water in the U-shaped glass tube on the graduated scale, so that the students can visually know the reasons of buoyancy generation and accurately know whether the factors such as the depth of an object immersed in liquid, the position of the object in the liquid, the liquid density and the like influence the buoyancy.

Drawings

Fig. 1 is a schematic structural view of a buoyancy generation cause demonstration device of the present invention;

FIG. 2 is a schematic view of a water tank of the buoyancy generation cause demonstration apparatus of the present invention;

FIG. 3 is a schematic structural view of a buoyancy testing device in the buoyancy generation cause demonstration device of the present invention;

fig. 4 is a schematic structural view of a pressure display device in the buoyancy generation cause demonstration device of the present invention;

fig. 5 is a schematic view of the connection relationship between the buoyancy testing device and the pressure display device.

Detailed Description

The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.

As shown in fig. 1 to 5, a buoyancy generation cause demonstration apparatus includes a water tank 10, a buoyancy testing device 20, and five pressure demonstration devices 30.

As shown in fig. 2, the water tank 10 is formed by bonding five acrylic plates, the top of the water tank is open, and a square mounting opening 11 is formed in the center of one side of the water tank 10.

As shown in fig. 3, the buoyancy testing device 20 includes a cube box 21. The square body box 21 is a hollow cubic structure with an opening on one side, and is also made by bonding five acrylic plates, the center position of each acrylic plate is provided with a communicating hole 24, the outer side of each acrylic plate is connected with a glass tube 22, the inner cavity of the glass tube 22 is communicated with the inner cavity of the square body box 21 through the communicating hole 24, and one end of the glass tube 22 far away from the square body box 21 is fixedly covered with a rubber film 23.

The square box 21 is hermetically installed in the installation opening 11, the open end of the square box 21 faces the outside of the water tank 10, and the five glass tubes 22 are all located inside the water tank 10. Five connecting pipes are installed in the inner cavity of the square box 21, one ends of the connecting pipes are bonded to the inner sides of the five side walls of the square box 21, and the connecting pipes are communicated with the glass tube 22 through the communication holes 24.

As shown in fig. 4, the pressure display device 30 includes a vertical plate support 31, a U-shaped glass tube 32 and a graduated scale 33 are fixedly installed on one side of the vertical plate support 31, and the graduated scale 33 is disposed at the center of the U-shaped glass tube 32.

As shown in fig. 1 and 5, the device further includes five latex tubes 40, one end of each latex tube 40 is connected to one end of one U-shaped glass tube 32, and the other end of each latex tube 40 is connected to a connecting tube in the square box 21, so that the inner cavity of each U-shaped glass tube 32 is communicated with the inner cavity of one glass tube 22 through one latex tube 40.

When demonstrating the reason of buoyancy, the square box 21 is firstly installed in the installation opening 11 of the side wall of the water tank 10, and coating water is poured into the U-shaped glass tubes 32 from one ends of the U-shaped glass tubes 32 which are not connected with the latex tubes; then, liquid is injected into the water tank 10, in the process of injecting the liquid, the liquid level gradually submerges each glass tube 22 along with the rising of the liquid level, at the moment, the rubber membrane 23 is deformed by the external liquid pressure, then the air in the glass tube 22 is extruded, the coating liquid level in the U-shaped glass tube 32 communicated with the glass tube 22 changes under the pressure, students can observe the coating liquid level in each U-shaped glass tube 32 in a contrast mode, the stress condition of each side face of an object immersed in the liquid is observed visually, and therefore the visual understanding of the reason for generating the buoyancy is formed.

In the actual teaching process, the student quantity is usually more, and the student is for enclosing the state usually when demonstrating the experiment, and the result of contrast observation can have certain deviation under the different visual angles. In this demonstration manor, because of latex tube 40 is flexible material, when carrying out the experiment, can change each pressure display device 30's position wantonly, make things convenient for the student to observe.

When explaining the cause of buoyancy, the students can arrange the pressure display devices 30 communicated with the glass tubes 22 on the top and bottom surfaces of the cube box 21 side by side, and the other three pressure display devices 30 are arranged side by side. When the liquid added in the water tank 10 submerges all the glass tubes 22 to a high degree, the readings on the graduated scale 33 corresponding to the coating liquid level in the U-shaped glass tubes 22 on the two pressure display devices 30 communicated with the glass tubes 22 on the top and bottom surfaces of the square box 21 are different, and the readings displayed on the other three pressure display devices 30 are always the same. The three pressure display devices 30 correspond to the pressures on the left, middle and right sides of the object, and the reading of the three pressure display devices is equal, which indicates that the pressures on the sides are always equal when the actual object is immersed in the liquid, and the buoyancy is not influenced. The reading on the pressure display device 30 connected with the bottom surface of the square box 21 is always higher than the reading on the pressure display device 30 connected with the top surface of the square box 21, which shows that the acting force exerted on the lower surface of the object immersed in the liquid is larger than the acting force exerted on the upper surface, and the pressure difference is the reason for generating the buoyancy.

Thereafter, the liquid is continuously added into the water tank 10, and through observation and comparison, although the coating liquid level in each U-shaped glass tube 22 changes, the difference between the reading on the pressure display device 30 connected with the bottom surface of the cube box 21 and the reading on the pressure display device 30 connected with the top surface of the cube box 21 is always constant, and the readings on the other three pressure display devices 30 are always equal, which indicates that the buoyancy force applied to the object immersed in the liquid has no relation to the immersion depth.

Further, the cube box 21 can slide in the mounting opening 11, the cube box 21 can slide when the liquid injection into the water tank 10 is stopped, and the readings on the pressure display devices 30 are observed, and no change is found in the readings, which indicates that the buoyancy force borne by the object immersed in the liquid is irrelevant to the position of the object immersed in the liquid.

In addition, after the readings on the pressure display devices 30 are recorded through one experiment, the liquid in the water tank 10 is replaced by the liquid with different densities, and the influence of the liquid density on the buoyancy can be researched through demonstration by comparing the readings on the pressure display devices 30 in each experiment.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The buoyancy generation cause demonstration device is characterized by comprising a water tank (10), a buoyancy testing device (20) and five pressure display devices (30);

the top of the water tank (10) is opened, and one side surface of the water tank (10) is provided with a mounting hole (11);

the buoyancy testing device (20) comprises a square box (21), the square box (21) is of a hollow cubic structure with one open surface, communication holes (24) are formed in the centers of the other five surfaces of the square box (21), glass tubes (22) are connected to the outer sides of the square box, the inner cavities of the glass tubes (22) are communicated with the inner cavity of the square box (21) through the communication holes (24), and one ends, far away from the square box (21), of the glass tubes (22) are fixedly covered with rubber films (23);

the pressure display device (30) comprises a vertical plate support (31), a U-shaped glass tube (32) and a graduated scale (33) are fixedly mounted on one side of the vertical plate support (31), and the graduated scale (33) is arranged at the center of the U-shaped glass tube (32);

the square body box (21) is installed in the installing opening (11) in a sealing mode, the open end of the square body box (21) faces the outside of the water tank (10), the square body box further comprises five latex tubes (40), and each inner cavity of the U-shaped glass tube (32) is communicated with the inner cavity of one glass tube (22) through one latex tube (40).

2. The buoyancy generating cause demonstration device according to claim 1, wherein the cube box (21) is slidable within the mounting opening (11).

3. The buoyancy generating cause demonstration device according to claim 1, wherein when the cube box (21) is installed in the installation opening (11), the pressure display devices (30) respectively communicated with the glass tubes (22) on the top surface and the bottom surface of the cube box (21) are arranged side by side, and the other three pressure display devices (30) are arranged side by side.