CN202677678U - Air buoyancy demonstrating device - Google Patents

Abstract

An air buoyancy demonstrator relates to a physics teaching appliance. The purpose of the utility model is to solve the problem that the buoyancy effect is not obvious due to poor airtightness of the instruments used to demonstrate the principle of air buoyancy in physics teaching, which seriously affects the buoyancy demonstration effect, thus making it difficult for students to understand the air buoyancy clearly and thoroughly. The sealing plug is tightly plugged into the lower port of the demonstration cylinder, the sealing plug has a first through hole, and the lower end cap has a second through hole, and one end of the conduit passes through the second through hole and the first through hole respectively to communicate with the demonstration cylinder , the other end of the conduit is equipped with a valve switch, the upper sealing gasket is set between the upper port of the demonstration cylinder and the upper end cover, the lower sealing gasket is set between the lower port of the demonstration cylinder and the lower end cover, and the sponge gasket is set tightly on the demonstration cylinder. On the sealing plug in the cylinder, the upper surface of the sponge gasket is a concave surface, and the lower end cover and the base are detachably connected. The utility model is applied in physics teaching.

Description

The aerostatic buoyancy demonstration device

Technical field

The utility model relates to a kind of aerostatic buoyancy demonstration device, belongs to the physical teaching aid field.

Background technology

In physics teaching, many demonstration instruments about the liquid buoyancy experiment are arranged, and do not have experimental demonstration for the buoyancy of air.Therefore, the student is when understanding the aerostatic buoyancy principle, usually can not understand because it is too abstract, clearly understand the aerostatic buoyancy principle in order to make students, teacher often will expend very large energy and explain, although can carry out the demonstration of aerostatic buoyancy with precision balance, but the precision balance price is high, be difficult for popularizing, especially the school in remote districts is difficult to possess especially, also have many teachers to expect that own making can give expression to the device of aerostatic buoyancy, but because the homemade aerostatic buoyancy device of teacher sealing is poor, DeGrain still can not be resolved student's query in the heart.

Summary of the invention

The purpose of this utility model provides a kind of aerostatic buoyancy demonstration device, make buoyancy effects not obvious with the instrument that solves demonstration aerostatic buoyancy principle in the physics teaching because sealing is poor, have a strong impact on the buoyancy demonstration effect, thereby cause the student aerostatic buoyancy to be understood the problem be difficult to reach clear thorough degree.

The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: described aerostatic buoyancy demonstration device comprises the demonstration cylinder, upper end cover, bottom end cover, fixed pulley, the first line, the second line, mass and a plurality of demonstration ball, described demonstration cylinder vertically arranges, the upper port place of demonstration cylinder is provided with upper end cover, the lower port place of demonstration cylinder is provided with bottom end cover, described fixed pulley, mass and a plurality of demonstration ball all are arranged on the inside of demonstration cylinder, a plurality of demonstration balls are connected in series by the first line, described the second line is wrapped on the fixed pulley, one end of the second line is fixedly connected with a plurality of demonstration balls, the other end of the second line is fixedly connected with mass, described aerostatic buoyancy demonstration device also comprises base, conduit, sealing-plug, the sponge pad, upper sealing washer, lower sealing washer, valve switch and a plurality of fastening bolt, described sealing-plug jam-pack is in the lower port of demonstration cylinder, be processed with the first through hole on the sealing-plug, be processed with the second through hole on the bottom end cover, the first through hole and the coaxial setting of the second through hole, one end of described conduit passes respectively the second through hole and the first through hole is communicated with the demonstration cylinder, the other end of described conduit is equipped with valve switch, described upper sealing washer is arranged between the upper port and upper end cover of demonstration cylinder, described lower sealing washer is arranged between the lower port and bottom end cover of demonstration cylinder, described sponge pad is adjacent on the sealing-plug that is arranged in the demonstration cylinder, the upper surface of sponge pad is concave panel, removably connects by a plurality of fastening bolts between described bottom end cover and the base.

The utility model compared with prior art comprises following beneficial effect: the setting of valve switch makes in order conveniently to control the conduit opening and closing in the utility model, and the demonstration effect of the aerostatic buoyancy when being conducive to the utility model and demonstrating in the classroom is remarkable; The setting of upper sealing washer and lower sealing washer is the better tightness for the upper and lower port that makes the demonstration cylinder, upper surface is that concave panel sponge pad can be concentrated rapidly the center that is rolled to the sponge pad at a plurality of demonstration balls when dropping to the sponge pad, avoid a plurality of demonstration balls with the collision of demonstration cylinder unnecessary loss to occur, be conducive to prolong serviceable life of the present utility model; Removably connect by a plurality of fastening bolts between bottom end cover and the base, strengthen stability of the present utility model, be conducive to realize the effect of aerostatic buoyancy; The utility model is visual in image, makes things convenient for teacher to impart knowledge to students and student experimenting.

Description of drawings

Fig. 1 is main TV structure schematic diagram of the present utility model.

Fig. 2 is the main TV structure schematic diagram of sponge pad.

Embodiment

Embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, described aerostatic buoyancy demonstration device comprises demonstration cylinder 1, upper end cover 2, bottom end cover 3, fixed pulley 5, the first line 6, the second line 7, mass 8 and a plurality of demonstration ball 10, described demonstration cylinder 1 vertically arranges, the upper port place of demonstration cylinder 1 is provided with upper end cover 2, the lower port place of demonstration cylinder 1 is provided with bottom end cover 3, described fixed pulley 5, mass 8 and a plurality of demonstration ball 10 all are arranged on the inside of demonstration cylinder 1, a plurality of demonstration balls 10 are connected in series by the first line 6, described the second line 7 is wrapped on the fixed pulley 5, one end of the second line 7 is fixedly connected with a plurality of demonstration balls 10, the other end of the second line 7 is fixedly connected with mass 8, described aerostatic buoyancy demonstration device also comprises base 4, conduit 9, sealing-plug 11, sponge pad 12, upper sealing washer 13, lower sealing washer 14, valve switch 15 and a plurality of fastening bolt 16, described sealing-plug 11 jam-packs are in the lower port of demonstration cylinder 1, be processed with the first through hole 17 on the sealing-plug 11, be processed with the second through hole 18 on the bottom end cover 3, the first through hole 17 and the 18 coaxial settings of the second through hole, one end of described conduit 9 passes respectively the second through hole 18 and the first through hole 17 is communicated with demonstration cylinder 1, the other end of described conduit 9 is equipped with valve switch 15, described upper sealing washer 13 is arranged between the upper port and upper end cover 2 of demonstration cylinder 1, described lower sealing washer 14 is arranged between the lower port and bottom end cover 3 of demonstration cylinder 1, described sponge pad 12 is adjacent on the sealing-plug 11 that is arranged in the demonstration cylinder 1, the upper surface of sponge pad 12 is concave panel, removably connects by a plurality of fastening bolts 16 between described bottom end cover 3 and the base 4.

Embodiment two: in conjunction with Fig. 1 and Fig. 2 explanation, the described demonstration cylinder 1 of present embodiment is transparent visual demonstration cylinder.The demonstration cylinder of transparent visual makes things convenient for students to observe the demonstration effect of aerostatic buoyancy, is conducive to the principle that students is better understood aerostatic buoyancy.

Embodiment three: in conjunction with Fig. 1 and Fig. 2 explanation, the number of the described a plurality of fastening bolts 16 of present embodiment is 2-6.Fastening bolt in this number range is conducive to better connect between bottom end cover 3 and the base 4.

Embodiment four: in conjunction with Fig. 1 and Fig. 2 explanation, the described mass 8 of present embodiment is the metal weights thing.When mass 8 is the metal weights thing, teacher can utilize magnet to attract the metal weights thing to move up and down outside demonstration cylinder 1 wall, make a plurality of demonstration balls 10 can be parked in arbitrary height, this state is suspended state, and the principle that can make things convenient for the student better to demonstrate aerostatic buoyancy is set like this.Magnet in the present embodiment is existing procucts.

In conjunction with embodiment one, two, three and four principle of work of the present utility model is described: open valve switch 15 and make demonstration cylinder 1 be in atmospheric pressure state with extraneous conducting, this moment, a plurality of demonstration balls 10 and mass 8 were in equilibrium state, were still in the container; When inflating for demonstration cylinder 1 by conduit 9, air pressure in the demonstration cylinder 1 increases, increase in density, a plurality of demonstration ball 10 suffered buoyancy increase, when buoyancy increases to difference with the buoyancy of mass 4 and is enough to overcome the resistance of the gravity of a plurality of demonstration balls 10 and balanced system, a plurality of demonstration balls 10 begin floating, namely prove the law of buoyancy of air.

Claims (4)

1. An air buoyancy demonstrator, said air buoyancy demonstrator comprises a demonstration cylinder (1), an upper end cover (2), a lower end cover (3), a fixed pulley (5), a first connecting line (6), a second Connecting wires (7), counterweights (8) and multiple demonstration balls (10), the demonstration cylinder (1) is vertically arranged, and an upper end cover (2) is provided at the upper port of the demonstration cylinder (1), and the demonstration The lower port of the cylinder (1) is provided with a lower end cover (3), and the fixed pulley (5), the counterweight (8) and a plurality of demonstration balls (10) are all arranged inside the demonstration cylinder (1). The demonstration balls (10) are connected in series through the first connection line (6), the second connection line (7) is wound on the fixed pulley (5), and one end of the second connection line (7) is connected with a plurality of demonstration balls ( 10) Fixed connection, the other end of the second connection line (7) is fixedly connected to the counterweight (8), characterized in that the air buoyancy demonstrator also includes a base (4), a conduit (9), a sealing plug ( 11), sponge gasket (12), upper sealing washer (13), lower sealing washer (14), valve switch (15) and multiple fastening bolts (16), the sealing plug (11) is plugged tightly in the demonstration The lower port of the barrel (1), the first through hole (17) is processed on the sealing plug (11), the second through hole (18) is processed on the lower end cover (3), the first through hole (17) and the second The through holes (18) are arranged coaxially, and one end of the conduit (9) passes through the second through hole (18) and the first through hole (17) to communicate with the demonstration cylinder (1), and the conduit (9) The other end is equipped with a valve switch (15), the upper sealing gasket (13) is arranged between the upper port of the demonstration cylinder (1) and the upper end cover (2), and the lower sealing gasket (14) is arranged on the demonstration cylinder ( Between the lower port of 1) and the lower end cover (3), the sponge gasket (12) is tightly arranged on the sealing plug (11) in the demonstration cylinder (1), and the upper surface of the sponge gasket (12) is The concave surface, the lower end cover (3) and the base (4) are detachably connected by a plurality of fastening bolts (16). 2. The air buoyancy demonstration device according to claim 1, characterized in that the demonstration cylinder (1) is a transparent visual demonstration cylinder. 3. The air buoyancy demonstrator according to claim 1 or 2, characterized in that the number of the plurality of fastening bolts (16) is 2-6. 4. The air buoyancy demonstrator according to claim 3, characterized in that the counterweight (8) is a metal counterweight.

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