CN103761912A

CN103761912A - Transparent Magdeburg hemispheres with replaceable medium

Info

Publication number: CN103761912A
Application number: CN201410022872.8A
Authority: CN
Inventors: 纪任春
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-01-08
Filing date: 2014-01-08
Publication date: 2014-04-30

Abstract

The invention provides Magdeburg hemispheres (1) made of a transparent material. A channel (2) and a channel (4) are formed in the opposite vertexes of the Magdeburg hemispheres respectively. When the Magdeburg hemispheres teaching demonstration is carried out, the Magdeburg hemispheres are vertically placed, namely, the connection line of A andA' is located on a vertical line, two valves (3) and (5) are switched on, colored liquid is injected into the Magdeburg hemispheres (1) from the first lower channel (2), a gas medium in the Magdeburg hemispheres is replaced by a liquid medium, and then Magdeburg hemispheres are vacuumized. The mode is easier than the mode of directly pumping gas, and the vacuum degree is higher. At this time, handles (6) and (7) of the Magdeburg hemispheres are pulled, the Magdeburg hemispheres can not be pulled open, and therefore existence of atmosphere is revealed. According to the Magdeburg hemispheres, any one valve can be switched off, the gas can be directly pumped through the other channel, and the mode is the same as that of traditional Magdeburg hemispheres. The Magdeburg hemispheres have the advantages of being simple in structure, easy to operate, high in vacuum degree and visual.

Description

The transparent Magdeburg hemispheres of removable media

Technical field

The invention belongs to physics educational apparatus technical field, relate to the atmospheric instrument of a kind of demonstration.

Technical background

Existing Magdeburg hemispheres is when demonstration atmospheric pressure, first to carry out bleeding in Magdeburg hemispheres, the air pump of general school is not useful, there will be the inadequate problem of vacuum tightness of bleeding, cause experiment effect not obvious, although improve the performance of air pump, can improve the effect of bleeding, can not be evacuated.Application number is 201120553139.0, the improved demonstrator for Magdeburg hemispheres test > of < < >, in order to make vacuum in Magdeburg hemispheres, first in Magdeburg hemispheres, be filled with dry ammonia or dry hydrogen chloride gas, then carry out the complicated operating process such as water filling, be also difficult to ensure high vacuum tightness in card Magdeburg hemispheres.And these instruments all can not intuitively show the vacuum condition in Magdeburg hemispheres.

Goal of the invention

The object of this invention is to provide a kind ofly, can easily will in Magdeburg hemispheres, be pumped into condition of high vacuum degree by conversion medium, and intuitively show that the novel air of the vacuum condition in Magdeburg hemispheres presses demonstration instrument for teaching.

Summary of the invention

The present invention realizes like this, with transparent material, make Magdeburg hemispheres, Magdeburg hemispheres to summit, respectively open a mouth, namely at the right opposite of the bleed-off passage of existing Magdeburg hemispheres, then open a passage, all load onto valve, when valve open, Magdeburg hemispheres inner chamber communicates with outside, closes obstructed.

In the time will carrying out Magdeburg hemispheres teaching demonstration, first Magdeburg hemispheres is vertically placed, two passages are on vertical curve, then by two valve opens, in from next passage to Magdeburg hemispheres, inject colored liquid, when liquid is expired at leisure, the air in Magdeburg hemispheres has also just been discharged from leisure; When liquid flows out from a upper passway, also just can see that Magdeburg hemispheres the inside has not had air, at this moment, first closes last valve, in next passway, liquid is extracted out, at this moment can see that the liquid in Magdeburg hemispheres constantly declines, liquid top just forms vacuum, after we extract liquid out, closes next valve, in Magdeburg hemispheres, just form vacuum, at this time draw the handle of Magdeburg hemispheres, Magdeburg hemispheres just can not draw away again, and has shown atmospheric existence.

That the present invention has is simple in structure, processing ease, vacuum tightness are high, advantage intuitively.

Accompanying drawing explanation

Fig. 1 is principle schematic of the present invention

(1) be that Magdeburg hemispheres, (2) are that passage first, (3) are for valve first, (4) are for passage second, (5) are for valve second, (6) (7) are for shaking hands.

Embodiment

With transparent material, make Magdeburg hemispheres (1) as shown in Figure 1, on the summit of two hemisphere, respectively open a passage (2) and (4), all load onto valve (3) and (5), when valve open, Magdeburg hemispheres inner chamber communicates with outside, closes obstructed.

In the time will carrying out Magdeburg hemispheres teaching demonstration, first Magdeburg hemispheres is vertically placed, be that the line of A, A ' is on a vertical curve, then two valves (3), (5) are opened, in from lower channel first (2) to Magdeburg hemispheres (1), inject colored liquid, when liquid is expired at leisure, the air in Magdeburg hemispheres has also just been discharged from from passage second (4) at leisure; When liquid flows out from a upper passage second (4) mouthful, can see that Magdeburg hemispheres (1) the inside is full of liquid, there is no air, at this moment, first close and close valve second (5), in lower channel first (2) mouthful, extract liquid out, at this moment can see that the liquid in Magdeburg hemispheres (1) constantly declines under the effect of gravity, liquid top just forms vacuum; When we Magdeburg hemispheres in liquid close lower valve first (3) after extracting out, Magdeburg hemispheres just forms vacuum in (1), handle (6), (7) of at this moment drawing Magdeburg hemispheres, Magdeburg hemispheres just can not draw away, and has shown atmospheric existence again.

The present invention replaces with liquid medium the gas medium in Magdeburg hemispheres, then vacuumizes, and its meeting is easier than the body of directly bleeding, and vacuum tightness also can be better.Certainly the present invention also can directly bleed any one valve closing by another one passage, the same with traditional Magdeburg hemispheres.

The present invention and existing Magdeburg hemispheres comparison, just many passages and valve, so have, simple in structure, processing ease, vacuum tightness are high, advantage intuitively.

Claims

1. one kind by two Loadings On Hemispherical Shells, two passages, two valves, two transparent Magdeburg hemispheres of replaceable medium that handle forms, it is characterized in that two transparent Loadings On Hemispherical Shells can be combined into a spheroid, on each hemispheroidal summit, be all provided with a passage, a valve is respectively housed on passage, and each Loadings On Hemispherical Shell is respectively equipped with a handle.