CN202502657U - Atmospheric pressure demonstrator with variable area - Google Patents
Atmospheric pressure demonstrator with variable area Download PDFInfo
- Publication number
- CN202502657U CN202502657U CN2012200860733U CN201220086073U CN202502657U CN 202502657 U CN202502657 U CN 202502657U CN 2012200860733 U CN2012200860733 U CN 2012200860733U CN 201220086073 U CN201220086073 U CN 201220086073U CN 202502657 U CN202502657 U CN 202502657U
- Authority
- CN
- China
- Prior art keywords
- cavity
- atmospheric pressure
- variable area
- demonstration device
- air
- 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
Images
Landscapes
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The utility model discloses an atmospheric pressure demonstrator with a variable area, which comprises two half symmetrical cavities and an air extracting tube component used for extracting air from the cavities. Each half cavity is provided with a contact plane, and the contact planes of the two half cavities attach to each other. A closed space is formed in the two half cavities when the contact planes of the two half cavities attach to each other. An air extracting mouth which extends from the inner part to the outer part of the cavity is arranged on the surface of the cavity. The inner part of the cavity is provided with grooves and sealing rubber rings which are filled in the grooves and matched with the grooves. A pulling component is arranged on the outer part of a disk. The atmospheric pressure demonstrator disclosed by the utility model has the advantages of simple structure, easy manufacture, small size, light weight, convenient carrying, energy conservation, and safe and reliable usage. A one-way valve can close the demonstrating space automatically after the air is extracted, thereby being simple and convenient in operation. The size of an area can be changed by placing sealing rubber rings with different diameters when the atmospheric pressure demonstrator is used, so that the relationship between a tensile force and a stressed area when the atmospheric pressure and the pressure are kept constant can be demonstrated only by using an injector to extract the air without a need of an air extractor.
Description
Technical field
The utility model relates to a kind of atmospheric pressure demonstration device of variable area.
Background technology
The atmospheric pressure demonstration is one of important content of physics teaching in secondary school; What the simulation Magdeburg hemispheres in the classroom, middle school was tested general usefulness is Magdeburg hemispheres made of iron; But accomplish to make the two hemispheres good seal not too easy; Often cause the failure of an experiment, and will use pumping with exhaust blower, therefore carry all cumbersome with experimental implementation.
[1](publishing house of the difficult experiment of the triumphant middle school of Luo Xing physics monographic study Guangxi Normal University 1998. 64.)
Reflect according to most teachers, make the atmospheric pressure lecture experiment with present iron Magdeburg hemispheres and have following problem: 1. existing whole experiment device volume, quality are all bigger, and it is very inconvenient to take the classroom, and reliability is not high yet; 2. air pump must could be worked in electricity consumption, and is also inconvenient when using operation; 3. area can not change, not the relation between illustrative pressure and the lifting surface area.
The utility model content
The purpose of the utility model is to the problems referred to above, and a kind of atmospheric pressure demonstration device of variable area simple and reliable, easy to use is provided.
The purpose of the utility model realizes through following technical proposals:
A kind of atmospheric pressure demonstration device of variable area; It is characterized in that: comprise the cavity of two hemihedry and the exhaust tube assembly that gas in the cavity is extracted out; Said half and half cavity has the contact plane of mutual applying; Two inside cavity form airtight space when the contact plane of two halves cavity is fitted; Said housing surface is provided with from inside cavity and extends to the outside mouth of bleeding, and said inside cavity is provided with groove and is filled in inside grooves and sealing rubber ring that groove is adaptive, and said disk outside is provided with the pulling parts.
As preferably, said inside cavity is provided with the positioning boss that makes the two halves cavity keep concentricity.
As preferably, said pulling parts comprise and are fixed on the draw ring on the disk and are through the stay cord on the draw ring.
As preferably, the said mouth of bleeding is provided with retaining valve.
As preferably, said exhaust tube assembly comprises the emulsion tube that is enclosed within on the mouth of bleeding, the joint sleeve that emulsion tube connects, the exhaust tube that joint sleeve connects.
As preferably, said cavity is dish shape disk or hemispherical disk.
As preferably, said groove is many concentric annular grooves.
As preferably, the diameter of said many annular grooves is different.
As preferably, said cavity is a plastic chamber.
The method of application of the utility model: when after putting O-ring seal between two chambeies; Disk and rubber ring are promptly formed an enclosure space; So just can easily extract wherein air with syringe through exhaust tube because this space is very little, air is drawn out of the rear enclosed space will form certain vacuum tightness, atmospheric pressure can be blocked the backflow of air automatically through retaining valve after taking off syringe; Make the certain vacuum tightness of maintenance between being evacuated, demonstration so just can experimentize.
The beneficial effect of the utility model: it is simple in structure for this apparatus for demonstrating, make easily, little in light weight, easy to carry, the energy savings, safe and reliable of volume; Retaining valve can be at the back sealing presentation space automatically of bleeding; Simple to operation; Can change the area size of inside cavity during use through the different sealing rubber ring of placement diameter, not need air pump, only bleed and just can demonstrate atmospheric pressure and pressure one timing pulling force (pressure) and lifting surface area relation with syringe.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the front view of left half cavity body.
Fig. 3 is the side view of left half cavity body.
Fig. 4 is the front view of right half cavity.
Fig. 5 is the side view of right half cavity.
Fig. 6 is the structural representation of exhaust tube assembly.
Wherein, 1 is the left half cavity body, and 2 is right half cavity, and 3 is the exhaust tube assembly, and 4 is contact plane, and 5 is groove; 6 is sealing rubber ring, and 7 is draw ring, and 8 is stay cord, and 9 are the mouth of bleeding, and 10 is retaining valve; 31 is emulsion tube, and 32 is joint sleeve, and 33 is exhaust tube, and 34 is syringe, and 35 is positioning boss.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the utility model is further described.
As shown in the figure, a kind of atmospheric pressure demonstration device of variable area comprises the cavity 1,2 of two hemihedry and the exhaust tube assembly 3 that gas in the cavity is extracted out, and said cavity is dish shape disk or hemispherical disk.Said exhaust tube assembly comprises the emulsion tube 31 that is enclosed within on the mouth of bleeding, the joint sleeve 32 that emulsion tube connects, the exhaust tube 33 that joint sleeve connects.Said half and half cavity has the contact plane 4 of mutual applying, and two inside cavity form airtight space when the contact plane of two halves cavity is fitted, and said housing surface is provided with from inside cavity and extends to the outside mouth 9 of bleeding, and the said mouth of bleeding is provided with retaining valve 10.Said inside cavity is provided with groove 5, be filled in the adaptive sealing rubber ring 6 of inside grooves and groove and make left and right sides cavity keep the positioning boss 35 of concentricity, and said groove is many concentric annular grooves.The diameter of said many annular grooves is different.Said disk outside is provided with the pulling parts.Said pulling parts comprise the draw ring 7 that is fixed on the disk and are through the stay cord 8 on the draw ring.Said cavity is a plastic chamber.
Poly (methyl methacrylate) plate about available thick 5mm cuts into plectane, bonds with methenyl choloride or ethylene dichloride earlier, lathes after waiting to solidify and is processed into required size, adds to note placing the cushion rubber place man-hour and keep smooth, gas leakage when avoiding the use of.
Sealing rubber ring with a certain format diameter during demonstration is placed on corresponding annular groove position; Two disks are closed, note making the exhaust tube direction upwards, be enclosed within on the emulsion tube with the syringe about 100ml 34; Can bleed behind slightly firmly closed two dishes; When feeling to have big resistance after bleeding, hold syringe, pulling out looses one's grip behind the emulsion tube fast gets final product.Because the effect of atmospheric pressure is with automatic airtight demonstration device interior or exterior space at this moment, bleeding, firmly big more obturation effect is good more.Demonstration is accomplished the back as if will exit the time, and the effective have gentle hands of desirable lower pumping is gently rotated retaining valve and got final product.
Disk size is: diameter 10cm, thick about 8cm; General assembly (TW) (not containing syringe) is less than 200g; According to placing diameter in the demonstration needs device respectively is 4.5cm, three kinds of different sealing rubber rings of sectional area of 6.5cm and 9.0cm; Be provided with on the dish and the donut groove of sealing rubber ring consistent size and positioning boss in order to guaranteeing the concentricity between cushion rubber and disk and two disks, retaining valve can bleed the back automatically sealing make the certain vacuum tightness of the inner maintenance of demonstration device.
When after putting O-ring seal between two disks; Disk and sealing rubber ring are promptly formed an enclosure space; So just can easily extract wherein air with syringe through exhaust tube because this space is very little, air is drawn out of the rear enclosed space will form certain vacuum tightness, atmospheric pressure can be blocked the backflow of air automatically through retaining valve after taking off syringe; Make the certain vacuum tightness of maintenance between being evacuated, demonstration so just can experimentize.
Can know that diameter is the sealing rubber ring of 4.5cm, its area through calculating
SAbout 1.59 * 10
-3m
26.5cm
SAbout 3.32 * 10
-3m
29.0cm
SAbout 6.50 * 10
-3m
2, be approximated to the relation of 1:2:4.
According to
P=F/S(or
F=PS), the pressure difference between inside and outside the apparatus for demonstrating is 1 standard atmospheric pressure [101325Pa (N/m
2)] time, if use the sealing rubber ring of nominal diameter as 4.5cm, the general pressure that this moment, the apparatus for demonstrating surface received will have about 160N. the pressure that receives as if the cushion rubber apparatus surface with 6.5cm will have about 330N; The pressure that receives as if the cushion rubber apparatus surface with 9.0cm will have about 650N.
According to our experiment test, when placing the 4.5cm cushion rubber, if extract the air in the hemisphere with syringe; Exert oneself a little during if bleed; Can mention the above counterweight of 80N (8kg) after then bleeding, keep the same dynamics of bleeding when placing the 6.5cm cushion rubber, can mention the counterweight more than the 160N (16kg), when placing the 9.0cm cushion rubber, can mention the counterweight more than the 300N (30kg); So when extracting the air in the hemisphere with syringe; Inside and outside pressure difference is reached about 0.5 atmospheric pressure, therefore, be easy to mention respectively 6 kg, 12 kg, the above weight of 24 kg through after forming parital vacuum with the air in the syringe draw-out device. the effect of atmospheric pressure is described thus; Through the pulling force different experiments that the area difference is born, the relation of pressure and lifting surface area can also be described.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (9)
1. the atmospheric pressure demonstration device of a variable area; It is characterized in that: comprise the cavity (1,2) of two hemihedry and the exhaust tube assembly (3) that gas in the cavity is extracted out; Said half and half cavity has the contact plane (4) of mutual applying; Two inside cavity form airtight space when the contact plane of two halves cavity is fitted; Said housing surface is provided with from inside cavity and extends to the outside mouth of bleeding (9), and said inside cavity is provided with groove (5) and is filled in inside grooves and sealing rubber ring (6) that groove is adaptive, and said disk outside is provided with the pulling parts.
2. the atmospheric pressure demonstration device of variable area as claimed in claim 1 is characterized in that: said inside cavity is provided with the positioning boss (35) that makes the two halves cavity keep concentricity.
3. according to claim 1 or claim 2 the atmospheric pressure demonstration device of variable area, it is characterized in that: said pulling parts comprise the draw ring (7) that is fixed on the disk and are through the stay cord (8) on the draw ring.
4. the atmospheric pressure demonstration device of variable area as claimed in claim 3, it is characterized in that: the said mouth of bleeding is provided with retaining valve (10).
5. the atmospheric pressure demonstration device of variable area as claimed in claim 4 is characterized in that: said exhaust tube assembly comprises the emulsion tube (31) that is enclosed within on the mouth of bleeding, the joint sleeve (32) that emulsion tube connects, the exhaust tube (33) that joint sleeve connects.
6. the atmospheric pressure demonstration device of variable area as claimed in claim 5, it is characterized in that: said cavity is dish shape disk or hemispherical disk.
7. the atmospheric pressure demonstration device of variable area as claimed in claim 6, it is characterized in that: said groove is many concentric annular grooves.
8. the atmospheric pressure demonstration device of variable area as claimed in claim 7 is characterized in that: the diameter difference of said many annular grooves.
9. the atmospheric pressure demonstration device of variable area as claimed in claim 8, it is characterized in that: said cavity is a plastic chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200860733U CN202502657U (en) | 2012-03-09 | 2012-03-09 | Atmospheric pressure demonstrator with variable area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200860733U CN202502657U (en) | 2012-03-09 | 2012-03-09 | Atmospheric pressure demonstrator with variable area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202502657U true CN202502657U (en) | 2012-10-24 |
Family
ID=47039266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200860733U Expired - Fee Related CN202502657U (en) | 2012-03-09 | 2012-03-09 | Atmospheric pressure demonstrator with variable area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202502657U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487920A (en) * | 2013-09-30 | 2014-01-01 | 中国科学院西安光学精密机械研究所 | Wide field image space telecentric optical system of three-line-array three-dimensional aerial survey camera |
| CN105927831A (en) * | 2016-06-17 | 2016-09-07 | 苏州华徕光电仪器有限公司 | Optical instrument rack |
| CN114112689A (en) * | 2021-11-18 | 2022-03-01 | 宣城市健龙橡塑密封件有限公司 | Tensile strength check out test set based on rubber and plastic sealing member production system |
-
2012
- 2012-03-09 CN CN2012200860733U patent/CN202502657U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487920A (en) * | 2013-09-30 | 2014-01-01 | 中国科学院西安光学精密机械研究所 | Wide field image space telecentric optical system of three-line-array three-dimensional aerial survey camera |
| CN103487920B (en) * | 2013-09-30 | 2016-06-08 | 中国科学院西安光学精密机械研究所 | Wide field image space telecentric optical system of three-line-array three-dimensional aerial survey camera |
| CN105927831A (en) * | 2016-06-17 | 2016-09-07 | 苏州华徕光电仪器有限公司 | Optical instrument rack |
| CN114112689A (en) * | 2021-11-18 | 2022-03-01 | 宣城市健龙橡塑密封件有限公司 | Tensile strength check out test set based on rubber and plastic sealing member production system |
| CN114112689B (en) * | 2021-11-18 | 2023-07-04 | 宣城市健龙橡塑密封件有限公司 | Tensile strength detection equipment based on rubber and plastic sealing piece production system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202502657U (en) | Atmospheric pressure demonstrator with variable area | |
| MX2013011864A (en) | Toy figure display stand. | |
| CN202650338U (en) | Homemade card for English teaching | |
| CN202650350U (en) | Magdeburg hemisphere experiment demonstrator | |
| CN204614309U (en) | A kind of physics teaching sound propagation demonstrator | |
| CN202332013U (en) | Improved demonstrator for Magdeburg hemispheres test | |
| CN203941640U (en) | A kind of gradual sound insulation teaching aid | |
| CN204576943U (en) | A kind of apparatus for demonstrating proving molecule interval size | |
| CN205122042U (en) | Air current is to demonstration appearance of atmospheric pressure influence | |
| CN203300104U (en) | Energy converting experimental apparatus | |
| CN204204285U (en) | Easy bleeder Magdeburg hemispheres experimental apparatus | |
| CN203070621U (en) | Water pressure demonstration apparatus for physics teaching | |
| CN204010449U (en) | A kind of acoustics education experiment device | |
| CN203149993U (en) | Teaching appliance for simulating working principle of water pump | |
| CN203733383U (en) | Medium-removable transparent Magdeburg hemisphere | |
| CN200997209Y (en) | Mini-hydraulic rocket | |
| CN203954629U (en) | Luminous badminton | |
| CN204010446U (en) | Liquid internal pressure is with the degree of depth, variable density demonstration device | |
| CN201210361Y (en) | Torricelli's experimental demonstrator convenient for storage | |
| CN203694296U (en) | Portable micro oxygen supply device | |
| CN210488983U (en) | Improved sound propagation condition demonstration device | |
| CN210223211U (en) | Higher mathematics circular motion instantaneous acceleration demonstration teaching aid | |
| CN203422874U (en) | Long tail type Cartesian diver | |
| CN204718849U (en) | Experiment of Analytical Chemistry gas sampling assembly | |
| CN202795846U (en) | Thermodynamics demonstration tube |
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: 20121024 Termination date: 20150309 |
|
| EXPY | Termination of patent right or utility model |