CN201877045U - Demonstrator for change of internal energy of air doing work - Google Patents
Demonstrator for change of internal energy of air doing work Download PDFInfo
- Publication number
- CN201877045U CN201877045U CN2010206197326U CN201020619732U CN201877045U CN 201877045 U CN201877045 U CN 201877045U CN 2010206197326 U CN2010206197326 U CN 2010206197326U CN 201020619732 U CN201020619732 U CN 201020619732U CN 201877045 U CN201877045 U CN 201877045U
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- air
- work
- doing
- change
- connecting pipe
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Abstract
The utility model discloses a demonstrator for the change of the internal energy of the air doing work, which comprises a base, a back board, an air chamber and an air reservoir are arranged on the base, a thermistor is arranged in the air reservoir, a terminal of the thermistor is connected with a temperature display screen, which is arranged on the back board, the air reservoir is connected with an air intake through a connecting pipe, and an air pressure meter is arranged on the connecting pipe. Since the utility model designs the work-doing air chamber and a piston, the work doing of the air can be easily observed and controlled. The designed work-doing system for the air can orderly control the process of an experiment, and can implement the goal of the experiment step by step. The demonstrator not only can demonstrate the work doing of the compressed air, but also can demonstrate the outward work doing of the air and the reduction of the internal energy of the air.
Description
Technical field
The utility model relates to a kind of instruments used for education of middle school physics, relates generally in a kind of gas acting that is used for teaching demonstration to change demonstration device.
Background technology
In newly organized compulsory education curricular standard experiment textbook " physics " ninth grade the 16 chapter second joint in the energy, lecture " change of energy in the object ", wherein, and " acting change object interior can " two lecture experiments are arranged: the one, " can increase in when air is compressed " with the air compression instrument demonstration of igniting; The one, with " mist formation method " demonstration " during the air push stopper, interior can the minimizing ".
" but mist formation method " can reduce a kind of display packing that temperature reduces as interior, and have a lot of queries and do not solve: because temperature reduces not is the sole cause of mist formation, so the inevitable outcome that mist formation neither the temperature reduction.Though so this experimental program strong operability is imprecise on science.
In the interior energy of second chapter 11 of full-time regular senior secondary school textbook (required adding takes as an elective course) " physics " the 4th joint object, lecture " dual mode of energy in changing ", two lecture experiments are arranged: the one, compress the instrument demonstration of igniting " pressure gas acting, gas internal energy increases " with air; The one, by in thick-walled vessel, inflating, increase the pressure in the container with " sensitive thermometer and an air tube ", " allowing gas wash plug open " makes " registration of thermometer obviously diminishes ", thus demonstration " gas externally does work, interior can the minimizing ".Adopt sensitive thermometer, air tube, thick-walled vessel and plug to do experiment, allow gas wash plug open, the thermometer registration is obviously diminished, this experimental program science strengthens, but operability is not strong, and experimental provision is difficult to control.
The utility model content
The purpose of this utility model is at above-mentioned the deficiencies in the prior art, provides in the acting of a kind of gas to change demonstration device, can demonstrate the pressure gas acting, can demonstrate again that gas externally does work, gas internal energy reduces, and its science and operability are all very strong.
The technical solution of the utility model realizes in the following manner: can change demonstration device in a kind of gas acting, comprise base, base is provided with backboard, air chamber and air drum, be provided with thermistor in the air drum, the binding post of thermistor links to each other with temperature display, temperature display is arranged on the backboard, and air drum links to each other with admission piece by connecting pipe, and connecting pipe is provided with rain glass.
Above-mentioned connecting pipe is provided with retaining valve.
The utility model design has acting air chamber and piston, helps observing and the pilot-gas acting.Design gas working system can the ordered control experimentation, implements object of experiment step by step.Can demonstrate pressure gas acting, can demonstrate again that gas externally does work, gas internal energy reduces.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
As shown in Figure 1, can change demonstration device in a kind of gas acting, comprise base 10, base 10 is provided with backboard 13, air chamber 2 and air drum 5, be provided with thermistor 4 in the air drum 5, the binding post 3 of thermistor 4 links to each other with temperature display 1 by microprocessor, and temperature display 1 is arranged on the backboard 13, air drum 5 links to each other with admission piece 9 by connecting pipe 8, and connecting pipe 8 is provided with rain glass 6.Connecting pipe 8 is provided with retaining valve 7.
Can change the temperature variation that causes in the gas acting, thermal resistor fixing seal of the utility model is assemblied in the air tank, the change in resistance of thermistor collection, converting temperature variation to by microprocessor (CPU) shows, display resolution is 0.1 ℃, the error that shows is not more than ± ℃, so just can directly gather the gas temperature of demonstration variation, improve the lecture experiment effect.
The utility model can be demonstrated two kinds of experiments:
1. demonstration pressure gas acting, gas internal energy increases: the shutoff operation valve, in air tank 5, to inflate, and the indicating value of temperature display 1 obviously raises, when air tank 5 internal pressures reached 0.15Mpa, the indicating value of temperature display 1 raise than ambient temperature value and is no less than 5 ℃.
2. demonstration gas externally does work, and gas internal energy reduces: on the basis of above-mentioned experiment, when opening operation valve 11, gas makes piston 12 rapid more than the rising 150mm, goes out air chamber 2; Simultaneously, air tank 5 internal pressure indicating values return zero; The indicating value of temperature display 1 obviously descends, and the minimum ambient temperature value that is less than is more than 5 ℃.
The utility model product have following characteristics:
1. air tank 5 transparent material manufacturing, useful volume is not less than 800ml, and wall thickness is not less than 5mm.
2. air chamber 2 transparent material manufacturing, internal diameter is not less than 40mm, and length is not less than 120mm, and wall thickness is not less than 4mm.Piston 12 is a right cylinder, should be able to slide in air chamber 2, and is fluent.
3. tensimeter 6 ranges are 0-0.25Mpa, scale division value 0.01Mpa, and 4.0 grades of precision, the error of indication should be not more than 1 scale division value.
4. retaining valve 7, operating valve 11 all adopt metallic article, and retaining valve 7 has direction signs, and operating valve 11 has the open and close location.
5. admission piece 9 adopts metallic article, is contained in connecting pipe 8 outer ends, should be suitable for being connected with the bicycle use inflator.
6. thermal resistor 4 should be selected the directly-heated type negative temperature coefficient thermistor for use, and in temperature was 15 ℃～35 ℃ scopes, the resistance of thermistor 4 varies with temperature should unidirectional significant change.The lead end of thermal resistor 4 is welded on the binding post 3, and sealing is assemblied in the air tank.
7. microprocessor (CPU) operating voltage is DC 6V, and maximum operating currenbt is not more than 50mA, the resistance variations information of should be able to treatment temperature gathering, and convert thereof into temperature variation and show that display resolution is 0.1 ℃, the error of demonstration is not more than ± and 1 ℃.
8. temperature display 1 adopts three bit digital semiconductors, and the bits per inch word size is not less than 20mm * 28mm.
Claims (2)
1. can change demonstration device in a gas acting, comprise base (10), base (10) is provided with backboard (13), air chamber (2) and air drum (5), be provided with thermistor (4) in the air drum (5), it is characterized in that: the binding post (3) of thermistor (4) links to each other with temperature display (1), temperature display (1) is arranged on the backboard (13), and air drum (5) links to each other with admission piece (9) by connecting pipe (8), and connecting pipe (8) is provided with rain glass (6).
2. can change demonstration device in the gas acting according to claim 1, it is characterized in that: connecting pipe (8) is provided with retaining valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206197326U CN201877045U (en) | 2010-11-23 | 2010-11-23 | Demonstrator for change of internal energy of air doing work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206197326U CN201877045U (en) | 2010-11-23 | 2010-11-23 | Demonstrator for change of internal energy of air doing work |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877045U true CN201877045U (en) | 2011-06-22 |
Family
ID=44164958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206197326U Expired - Fee Related CN201877045U (en) | 2010-11-23 | 2010-11-23 | Demonstrator for change of internal energy of air doing work |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877045U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050035A (en) * | 2012-12-11 | 2013-04-17 | 安徽师范大学 | Refrigeration principle type display device |
-
2010
- 2010-11-23 CN CN2010206197326U patent/CN201877045U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050035A (en) * | 2012-12-11 | 2013-04-17 | 安徽师范大学 | Refrigeration principle type display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20151123 |