CN203931281U - A kind of teaching aid - Google Patents
A kind of teaching aid Download PDFInfo
- Publication number
- CN203931281U CN203931281U CN201420261674.2U CN201420261674U CN203931281U CN 203931281 U CN203931281 U CN 203931281U CN 201420261674 U CN201420261674 U CN 201420261674U CN 203931281 U CN203931281 U CN 203931281U
- Authority
- CN
- China
- Prior art keywords
- teaching aid
- perforate
- lower casing
- upper shell
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Apparatus For Making Beverages (AREA)
Abstract
The utility model relates to a kind of teaching aid, comprise the upper-lower casing of two perforate couplings, in described lower house, be provided with the perforate that the inner well heater evaporating, upper shell is provided with communicate with the external world and for opening and closing the valve of described perforate, upper-lower casing is combined to form teaching aid body.Teaching aid of the present utility model can fully be shown inside and outside atmospheric variation and the effect producing, and the physical phenomenon such as liquid evaporation and condensation, simple in structure, naturally vividly.
Description
Technical field
The utility model relates to a kind of depression generator, relates in particular to a kind of teaching aid of showing that atmospheric pressure exists.
Background technology
Application number is that 02215709.3 Chinese patent relates to a kind of teaching aid of demonstrating atmospheric pressure principle.This teaching aid is a kettle with two mutual isolated kettle chambeies (6-1,6-2), on the kettle body communicating with kettle chamber, two of left and right respectively on handle top, have two pores (1-1,1-2), respectively there is an apopore (3-1,3-2) in two kettle chambeies, in kettle, liquid flows out by same Hu Zui (4), has respectively two water injection holes of adding a cover (2-1,2-2) at the top in two kettle chambeies.The utility model has been demonstrated atmospheric pressure principle simply, legibly, can be used for the various physics teachings of middle and primary schools.The Chinese patent that and for example application number is 201120130421.8 discloses a kind of Magdeburg hemisphere teaching aid, relates to a kind of teaching aid, provides a kind of without air extractor, Magdeburg hemisphere teaching aid simple in structure, easy to operate, security is good.Be provided with left sucker, left bolt, left ring nut, Zola's hand, right sucker, right bolt, right ring nut and right handle; Left bolt one end is fixed in left sucker top, and the left bolt other end and left ring nut are spirally connected, and Zola's hand is connected with left ring nut, right bolt one end is fixed in right sucker top, the right bolt other end and right ring nut are spirally connected, and right handle is connected with left ring nut, and left sucker and right sucker are involutory.These two kinds of teaching aids all exist demonstration single, defect not intuitively.
Summary of the invention
The utility model object is to provide a kind of teaching aid, is to utilize the method for negative pressure of producing in teaching aid, proves that the atmospheric pressure in teaching aid is less than the atmospheric pressure of teaching aid outside, and the liquid suction function of negative pressure is demonstrated in the folding comparison of teaching aid simultaneously.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: a kind of teaching aid, comprise the upper-lower casing of two perforate couplings, in described lower house, be provided with and make the inner well heater evaporating, upper shell is provided with the perforate that communicates with the external world and for opening and closing the valve of described perforate, upper-lower casing is combined to form teaching aid body.The utility model adds liquid in housing, heats by well heater, makes the intrinsic liquid evaporation of teaching aid, after vaporizing liquid, from housing is discharged in perforate, then closes well heater and valve cooling teaching aid body, has just formed negative pressure in housing.The teaching aid body that this two housings are combined to form, in the time that liquid evaporation sprays by perforate, just proves that the internal pressure of teaching aid body is greater than outside atmospheric pressure, and therefore steam will outwards discharge, and reduces inside and outside pressure reduction; When well heater stops heating valve-off, teaching aid body is slowly cooling, due to condensing of steam inside, airborne molecule content will sharply reduce, and the inner atmosphere of teaching aid body is pressed and will be reduced, form negative pressure, although at this moment two housings are not fixedly connected with, be separately more difficult, be filled with air unless opened valve, remove negative pressure state, this is just enough to demonstrate atmospheric existence and power to student; This teaching aid body with negative pressure, perforate alignment liquid, opens valve, and liquid will be drawn in teaching aid body automatically, the result of external pressure effect that Here it is.This teaching aid can also be shown the evaporation of liquid and the physical phenomenon that condensation produces to student simultaneously.Very lively, directly perceived.
As preferably, the valve on described upper shell is connected with conduit.
As preferably, on described upper shell, tensimeter is installed.
As preferably, described upper shell is that transparent material is made.
As preferably, described lower house is that transparent material is made.
As preferably, described upper-lower casing is equipped with draw ring.
As preferably, described liquid is water.
As preferably, outside described lower house, be provided with water jacket, water jacket has water inlet and water delivering orifice.
In order better to seal teaching aid body, as preferably, between described upper-lower casing, be provided with seal.
The beneficial effect that the utility model brings is, teaching aid of the present utility model can fully be shown inside and outside atmospheric variation and the effect producing, and the physical phenomenon such as liquid evaporation and condensation, simple in structure, naturally vividly.
Brief description of the drawings
Accompanying drawing 1 is a kind of structural representation of the present utility model;
Accompanying drawing 2 is another kind of structural representations of the present utility model;
Label declaration: 1-1, upper shell; 1-2, lower house; 2, well heater; 3, conduit; 4, valve; 7, draw ring; 8, O-ring seal; 9, water jacket; 10, tensimeter.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: as shown in Figure 1, upper shell 1-1 is U-shaped housing, and upper shell 1-1 is transparent material manufacture, and draw ring 7 is installed on upper shell 1-1, and there is conduit 3 on the side of draw ring 7, and conduit 3 is provided with valve 4; Lower house 1-2 is tubular shell, and lower house 1-2 is transparent material manufacture, and lower house 1-2 inner bottom is provided with electric heater, and lower house 1-2 bottom is provided with draw ring 7, and upper shell 1-1 and lower house 1-2 junction are provided with O-ring seal 8, has formed the teaching aid body of sealing.
The negative pressure formation method of the present embodiment, comprises the following steps:
1, open valve 4, in teaching aid body, inject a certain amount of water;
2, keep valve 4 to open, housing inner chamber is communicated with the external world, and start well heater 2, heating water a period of time is until there is water vapor to emerge;
3, close well heater 2 and valve 4, by air cooling, make the air of enclosure interior cooling, thereby teaching aid body interior just progressively forms negative pressure.Although upper shell 1-1 is not fixedly connected with lower house 1-2, along with the decline of teaching aid body temperature, want to pull open upper-lower casing just more and more difficult.
Embodiment 2: as shown in Figure 2, upper-lower casing shape is identical with embodiment 1, difference is that upper-lower casing is metal material manufacture, and tensimeter 10 is installed on upper shell 1-1, and lower house 1-2 outside is provided with water jacket 9, and other is identical with embodiment 1, repeats no more here.
Due to tensimeter 10 and water jacket 9 being installed, student can see the variation of internal pressure more intuitively like this, by water jacket 9 water flowing coolings, makes the temperature variation of teaching aid body faster, is beneficial to teaching demonstration.This teaching aid body with negative pressure, conduit 3 alignment liquids, opens valve 4, and liquid will be drawn in teaching aid body automatically, the result of external pressure effect that Here it is.This teaching aid can also be shown the evaporation of liquid and the physical phenomenon that condensation produces to student simultaneously.Very lively, directly perceived.
Below be only described with regard to the utility model preferred embodiment, but can not be interpreted as it is the restriction to the utility model protection domain.The utility model is not only confined to above embodiment, and its concrete structure or shape allow to change.In a word, protection domain of the present utility model should comprise the apparent conversion of those corresponding those of ordinary skill in the art or substitute and remodeling.
Claims (9)
1. a teaching aid, comprise the upper-lower casing of two perforate couplings, it is characterized in that: in described lower house, be provided with the perforate that the inner well heater evaporating, described upper shell is provided with communicate with the external world and for opening and closing the valve of described perforate, upper-lower casing is combined to form teaching aid body.
2. a kind of teaching aid according to claim 1, is characterized in that, the valve on described upper shell is connected with conduit.
3. a kind of teaching aid according to claim 2, is characterized in that, described upper-lower casing is equipped with draw ring.
4. a kind of teaching aid according to claim 1, is characterized in that, between described upper-lower casing, is provided with seal.
5. a kind of teaching aid according to claim 1, is characterized in that, described liquid is water.
6. a kind of teaching aid according to claim 5, is characterized in that, on described upper shell, tensimeter is installed.
7. a kind of teaching aid according to claim 1, is characterized in that, described lower house outside is provided with water jacket, and water jacket has water inlet and water delivering orifice.
8. according to a kind of teaching aid described in claim 1 or 2 or 3, it is characterized in that, described upper shell is that transparent material is made.
9. according to a kind of teaching aid described in claim 1 or 3, it is characterized in that, described lower house is that transparent material is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420261674.2U CN203931281U (en) | 2014-05-22 | 2014-05-22 | A kind of teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420261674.2U CN203931281U (en) | 2014-05-22 | 2014-05-22 | A kind of teaching aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203931281U true CN203931281U (en) | 2014-11-05 |
Family
ID=51827056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420261674.2U Expired - Fee Related CN203931281U (en) | 2014-05-22 | 2014-05-22 | A kind of teaching aid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203931281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700693A (en) * | 2014-05-22 | 2015-06-10 | 宁波职业技术学院 | Teaching tool |
-
2014
- 2014-05-22 CN CN201420261674.2U patent/CN203931281U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700693A (en) * | 2014-05-22 | 2015-06-10 | 宁波职业技术学院 | Teaching tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203931281U (en) | A kind of teaching aid | |
| CN204318405U (en) | A kind of Steam Recovery condensing unit of steam cooking device | |
| CN104700693A (en) | Teaching tool | |
| CN204073489U (en) | A kind of efficient energy-saving extractor | |
| CN203498355U (en) | Rose essential oil condensing equipment | |
| CN104690043A (en) | Negative pressure generation method and negative pressure generation device | |
| CN207468568U (en) | A kind of forced-ventilated plants essential oil extraction equipment | |
| CN203846010U (en) | Household wine-making device | |
| CN204337827U (en) | Multi-function extractor | |
| CN203936082U (en) | Multifunctional negative-pressure generating means | |
| CN204981817U (en) | Volatile oil extraction device with multilayer partition plate | |
| CN204411756U (en) | A kind of Novel visual sieve plate distillation column teaching experimental equipment | |
| CN203922794U (en) | A kind of ultraviolet sterilizer | |
| CN103981049B (en) | Family expenses alcoholic device | |
| CN203319726U (en) | Dual-purpose distiller | |
| CN202777913U (en) | Multifunctional extraction pot with bottom heater | |
| CN207898692U (en) | A kind of steam sterilization cabinet | |
| CN204351622U (en) | The water dispenser that a kind of carrying vapour is eliminated | |
| CN201401855Y (en) | Atmospheric steam heating device | |
| CN203869293U (en) | Instant heating device | |
| CN210645157U (en) | Reboiler of ethanol recovery tower for preparing N, N-dimethylamino ethyl acrylate | |
| CN203458819U (en) | Distillation retort capable of recycling fruit aromas and pigments | |
| CN205245162U (en) | From alcohol burner of taking asbestos gauge | |
| CN203980694U (en) | The interim water storage device of a kind of shower | |
| CN204699416U (en) | A kind of novel circulation-type evaporimeter |
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: 20141105 Termination date: 20190522 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |