CN201532722U

CN201532722U - Air buoyancy demonstration instrument

Info

Publication number: CN201532722U
Application number: CN2009202404983U
Authority: CN
Inventors: 范方欣
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-28
Filing date: 2009-10-28
Publication date: 2010-07-21
Anticipated expiration: 2019-10-28

Abstract

The utility model discloses an air buoyancy demonstration instrument belonging to an experimental instrument for physics teaching. The air buoyancy demonstration instrument is characterized in that a body is an organic transparent glass cylindrical sealed container, the upper portion of the container is provided with a fixed pulley, two ends of a thin line passing around the fixed pulley are respectively fixed with a small light-weight buoyancy demonstration ball and a weight, and the lower end of the container is provided with an air hole connected with an external exhausting and inflating device. The bottom portion of the container is provided with a sponge cushion for preventing the weight from falling down to the bottom portion of the container. With a fixed pulley balance device formed by the small light-weight buoyancy demonstration ball and the weight which are arranged inside the sealed transparent organic glass container, the air buoyancy demonstration instrument realizes the purpose of visually verification on F<buoyancy>= phi<gas density>*g*V<displaced volume>, pressure in the sealed container is changed by exhausting air from or pumping air into the container, therefore, air buoyancy untaken by the small light-weight demonstration ball is changed while changing the air density, and the ball then moves up or down along with the change, thereby realizing vivid vision and facilitating teaching and students' experiments.

Description

The aerostatic buoyancy demonstrator

Technical field

The utility model belongs to the physics teaching experiment instrument, experimental provision that particularly can the ocular demonstration aerostatic buoyancy.

Background technology

In physics teaching in secondary school, can relate to aerostatic buoyancy knowledge, but not have concrete operability experimental apparatus, general analogy liquid buoyancy teaching.

The utility model content

In order to overcome not intuitively deficiency of existing teaching aerostatic buoyancy, the utility model provides a kind of aerostatic buoyancy demonstrator, the various states that this aerostatic buoyancy demonstrator can ocular demonstration object suffered buoyancy in air.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of aerostatic buoyancy demonstrator, it is characterized in that: main body is organic clear glass column closed container, fixed pulley is arranged at the top at described container, the fine rule two ends of walking around fixed pulley are fixed with lightweight buoyancy demonstration bead and mass respectively, and described container lower end is provided with the outside and lashes the air inlet/outlet that device of air is connected.And foam-rubber cushion is arranged at the bottom at described container, falls container bottom in case work as mass.

The beneficial effects of the utility model are fixed pulley balance devices of being made up of lightweight buoyancy demonstration bead and extension mass in airtight transparent organic glass container, reach and verify F intuitively _Floating=ρ _GasGV _RowPurpose, by in container, extracting or squeeze into air out, change the pressure in the closed container, thereby when changing atmospheric density, the aerostatic buoyancy that lightweight buoyancy demonstration bead is subjected to will change, and rise thereupon or move down, visual in image like this, be convenient to teaching and student experimenting.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model,

Among the figure, 1. closed container, 2. fixed pulley, 3. buoyancy demonstration bead, 4. mass, 5. air inlet/outlet, 6. foam-rubber cushion.

Embodiment

Embodiment of the present utility model is, as shown in the figure:

Embodiment 1, a kind of aerostatic buoyancy demonstrator, main body is organic clear glass column closed container 1, on the top of described container 1 fixed pulley 2 is arranged, the fine rule two ends of walking around fixed pulley 2 are fixed with lightweight buoyancy demonstration bead 3 and mass 4 respectively, described container 1 lower end is provided with outside and lashes the air inlet/outlet 5 that device of air is connected, and in the bottom of described container 1 foam-rubber cushion 6 is arranged, and falls container 1 bottom in case work as mass 4.When container 1 and extraneous conducting were in atmospheric pressure state, lightweight buoyancy demonstration bead 3 was in equilibrium state with mass 4, is still in the container 1; When inflating for container 1, the air pressure in the closed container 1 increases, increase in density, and the buoyancy that described bead 3 is subjected to increases, and when the buoyancy difference with mass 4 was enough to overcome the resistance of the gravity of described bead 3 and balanced system, described bead 3 began to float when big; When bleeding, the air pressure in the described closed container 1 reduces, and density diminishes, and buoyancy reduces, and described bead 3 begins to sink; When described bead 3 is in atmospheric pressure state, affect irony mass 4 with magnet, described bead 3 can be parked in any height, can be considered as suspending.

Claims

1. aerostatic buoyancy demonstrator, it is characterized in that: main body is organic clear glass column closed container, fixed pulley is arranged at the top at described container, the fine rule two ends of walking around fixed pulley are fixed with lightweight buoyancy demonstration bead and mass respectively, and described container lower end is provided with the outside and lashes the air inlet/outlet that device of air is connected.

2. aerostatic buoyancy demonstrator according to claim 1 is characterized in that: foam-rubber cushion is arranged at the bottom of described container.