CN201828486U

CN201828486U - Experimental determination device for oxygen content in air

Info

Publication number: CN201828486U
Application number: CN2010205765401U
Authority: CN
Inventors: 赵黎燕
Original assignee: ZHUJI CITY DATANG TOWN CENTRAL SCHOOL
Current assignee: ZHUJI CITY DATANG TOWN CENTRAL SCHOOL
Priority date: 2010-10-26
Filing date: 2010-10-26
Publication date: 2011-05-11
Anticipated expiration: 2020-10-26

Abstract

The utility model discloses an experimental determination device for oxygen content in air. The experimental determination device is characterized by comprising a U-shaped tube, a rubber stopper, a combustion spoon and a heating wire, wherein two straight tubes of the U-shaped tube are provided with scales in the range of minus 1.0 to 5.0 at the same position; the distance from the scale 5.0 to the mouth of the U-shaped tube is equal to the height of the rubber stopper; the combustion spoon is inserted on the rubber stopper; the rubber stopper is plugged in the mouth of one end of the U-shaped tube; the heating wire is arranged above the combustion spoon and is connected with a copper wire passing through the rubber stopper; the copper wire and an external power supply are connected into a circuit loop; the experimental determination device has the benefits that firstly red phosphorous is put into the combustion spoon, then the rubber stopper is plugged and finally the heating wire is used for burning the red phosphorous, thus preventing the experimental environment from being impacted by the combustion of red phosphorous outside the tube; while one end of the U-shaped tube is communicated with air so that enough expansion space exists when the combustion of red phosphorous causes air in an enclosed space to be heated and expand; and in addition, the device also avoids other defects of the traditional device and ensures the accuracy of determination results.

Description

The measuring device of oxygen content in a kind of air

Technical field

The utility model relates to the measuring device of oxygen content in a kind of air.

Background technology

Traditional experimental provision that is used for measuring the air oxygen content is gas bottle, beaker, conduit etc., concrete structure is seen shown in the accompanying drawing 1, during experiment, in combustion spoon, contain excessive red phosphorus, insert (volume five five equilibriums of gas bottle in the gas bottle after lighting immediately, and carry out mark) and the jam-pack rubber stopper, the red phosphorus burning generates a large amount of white cigarettes, treat the red phosphorus fray-out of flame, after gas bottle is cooled to room temperature, open supravasal spring clamp, the water in the beaker enters gas bottle, the water in bottle face is exactly the volume of oxygen in the air finally near scale 1 place and enter bottle volume of interior water.But there is the deficiency of the following aspects in this experimental provision:

(1), red phosphorus and oxygen reaction generate a large amount of heat, and gas does not have the expansion space, poor stability in the bottle;

(2), red phosphorus lights outside bottle, emits poisonous irritating smog during the phosphorus burning, has a strong impact on experimental situation, and reach again after outside bottle, lighting in the process at the bottom of the gas bottle bottle, air expanded by heating in the bottle has little air and discharges outside the bottle, causes measurement result higher; If the experimenter operates unskilled, can cause the data measured more inaccurate;

(3), after spring clamp decontrols, original air in conduit entered in the bottle, and the water that experiment finishes in the rear tube can not all enter in the gas bottle, these factors all can cause measurement result inaccurate.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of safe and reliable, measurement result measuring device of oxygen content in the air accurately.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: the measuring device of oxygen content in a kind of air, comprise U type pipe, rubber stopper, combustion spoon and heating wire, two straight tubes of described U type pipe are provided with the scale of-1.0～5.0 scopes at the same position place, scale 5.0 equals the height of described rubber stopper to the distance of the described U type pipe mouth of pipe, described combustion spoon is inserted on the described rubber stopper, described rubber stopper plug is on an end mouth of pipe of described U type pipe, described heating wire is arranged on the top of described combustion spoon and is connected with the copper wire that passes described rubber stopper, and described copper wire and external power supply are linked to be a circuit loop.

Compared with prior art, the utility model has the advantages that and earlier red phosphorus is put into combustion spoon, fill in rubber stopper then, lighted red phosphorus by heating wire again, avoided red phosphorus to burn and influence experimental situation in that pipe is outer, and an end and the air communication of U type pipe, after red phosphorus burning makes air expanded by heating in the enclosure space, enough expansion spaces can be arranged, in addition, this device has also been avoided other defective of conventional apparatus existence, has guaranteed the accuracy of measurement result.

Description of drawings

Fig. 1 is traditional experimental provision synoptic diagram;

Fig. 2 is a structural representation of the present utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 2, the measuring device of oxygen content in a kind of air, comprise U type pipe 1, rubber stopper 2, combustion spoon 3 and heating wire 4, two straight tubes of U type pipe 1 are provided with the scale of-1.0～5.0 scopes at the same position place, the distance of scale 5.0 to U type pipes 1 mouth of pipe equals the height of rubber stopper 2, combustion spoon 3 is inserted on the rubber stopper 2, rubber stopper 2 plugs are on an end mouth of pipe of U type pipe 1, heating wire 4 is arranged on the top of combustion spoon 3 and is connected with the copper wire 5 that passes rubber stopper 2, and copper wire 5 is linked to be a circuit loop with external power supply.

During experiment, fixing U type pipe 1, add water to 0 scale, and two straight tube water levels are equal about making, in combustion spoon 3, put into red phosphorus then, rubber stopper 2 is filled in the mouth of pipe of U type pipe 1, connect external power supply heating heating wire 4, the red phosphorus burning, produce a large amount of white cigarettes, because the air expanded by heating in U type pipe 1 sealed end, the underwater of combustion spoon 3 belows is reduced to below 0 scale, after question response stops, disconnect external power supply, along with cooling, the water surface of combustion spoon 3 belows rises to 0.5 gradually, and the decline of water table of other end straight tube is to-0.5 simultaneously.According to liquid pressure formula: P=ρ gh, the pressure difference Δ p=ρ g Δ h at U type pipe 1 two ends, promptly at an end of U type pipe 1 internal combustion spoon 3, the result of red phosphorus burning makes the liquid in the U type pipe 1 produce pressure difference Δ p=ρ g Δ h, and Δ h=1.0, illustrate that just in time the air that is positioned at combustion spoon 3 one ends in U type pipe 1 has consumed oxygen about 1/5 volume because of the burning of red phosphorus, and the cumulative volume of this end straight tube air is 5 scales, therefore can draws 1/5 the conclusion that oxygen accounts for volume of air; If will make that experimental phenomena is more directly perceived, can in the other end (non-tight end) straight tube of U type pipe 1, slowly inject water, make liquid level reach 0 scale, at this moment the straight tube liquid level that can find U type pipe 1 sealed end rises to 1.0 scales, therefore and the cumulative volume of this end straight tube air is made as 5 scales, can draw 1/5 the conclusion that oxygen accounts for volume of air comparatively intuitively.

Claims

1. the measuring device of oxygen content in the air, it is characterized in that comprising U type pipe, rubber stopper, combustion spoon and heating wire, two straight tubes of described U type pipe are provided with the scale of-1.0～5.0 scopes at the same position place, scale 5.0 equals the height of described rubber stopper to the distance of the described U type pipe mouth of pipe, described combustion spoon is inserted on the described rubber stopper, described rubber stopper plug is on an end mouth of pipe of described U type pipe, described heating wire is arranged on the top of described combustion spoon and is connected with the copper wire that passes described rubber stopper, and described copper wire and external power supply are linked to be a circuit loop.