Magdeburg hemisphere experiment teaching aid

Abstract

The utility model discloses a Magdeburg hemisphere experiment teaching aid which comprises a first sealing cavity and a second sealing cavity, a detachable structure is arranged between the first sealing cavity and the second sealing cavity, and a sealing ring is arranged between the first sealing cavity and the second sealing cavity. Steel plates are arranged on the inner sides and the outer sides of the first sealing cavity and the second sealing cavity, screws are arranged on the steel plates on the two sides in a penetrating mode, nuts are arranged on the screws on the outer side faces of the first sealing cavity and the second sealing cavity to fix the steel plates on the inner sides and the outer sides, and pull rings are arranged at the ends of the screws on the outer sides. According to the utility model, the atmospheric pressure experiment can be realized in various modes, the student participation degree is high, the experiment effect is high, and the safety is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to air pressure teaching aid technical field, concretely relates to madenburg hemispherical experiment teaching aid. BACKGROUND

[0002] Madenburg hemispherical experiment shows that the existence of atmospheric pressure, and atmospheric pressure is relatively big. The existing experimental teaching aid is heavy, and the existing teaching aid cannot observe the internal condition of the experimental teaching aid, and the student participation is not good. The existing teaching aid also has the condition of single experiment. UTILITY MODEL CONTENT

[0003] In view of the above-mentioned insufficient, the utility model discloses madenburg hemispherical experiment teaching aid, can be through the vacuum mode, also can through the ignition combustible and reduce the air pressure in teaching aid, and students can participate in the test of atmospheric pressure through pulling and other various forms, make the experiment novel and interesting, increase the experience of education and the participation of students.

[0004] The utility model discloses the following technical scheme to realize the above-mentioned purpose:

[0005] Madenburg hemispherical experiment teaching aid, including first sealed cavity and second sealed cavity, the first sealed cavity and second sealed cavity are detachable structure, the first sealed cavity and second sealed cavity are provided with sealing ring between, the cavity inboard and the outside of first sealed cavity and second sealed cavity are provided with steel sheet, the both sides steel sheet is provided with screw nail through, the screw nail on the outside of first sealed cavity and second sealed cavity is provided with the nut and fixes the steel sheet of inside and outside, the end of outside screw nail is provided with the pull ring.

[0006] Preferably, the steel plate and the first and second sealed cavities are provided with a sealing gasket to prevent air leakage between the two sealed cavities.

[0007] Preferably, the first or second sealed cavity is provided with an air valve, and the air valve is provided with an air switch to facilitate air blockage outside the cavity and pressure relief inside the cavity.

[0008] Preferably, the first sealed cavity and the second sealed cavity are symmetrical cylindrical cavity structures.

[0009] Preferably, the first and second sealed cavities are made of transparent plastic material to facilitate observation of the internal condition of the teaching aid.

[0010] Preferably, the first and second sealed cavities have a circular cross-section, and the steel plate is a circular disc.

[0011] Preferably, the inner side steel plate diameter of the first and second sealed cavities is smaller than the cavity diameter of the inner side of the first and second sealed cavities, and the outer side steel plate diameter is smaller than or equal to the inner side steel plate diameter.

[0012] Preferably, the pull ring of the first and second sealed cavities is provided with a long rope on both sides, so that students can pull and verify the existence of atmospheric pressure.

[0013] Preferably, a safety rope is arranged between the pull rings of the first and second sealed cavities, and the safety rope and the long ropes on both sides are one rope, which prevents students from being injured when pulling apart the first and second sealed cavities, and plays a buffering role.

[0014] The beneficial effects of the present application are as follows: the present application is provided with a vent valve, which facilitates pressure relief and sealing of the teaching aid, opening of the vent valve switch can facilitate air extraction operation by an air extractor, and closing of the vent valve switch can facilitate combustion of combustible materials in the first or second sealed cavity to reduce the air pressure in the two cavities; the pull ring and the rope can facilitate stretching of the first and second sealed cavities to verify the existence and size of atmospheric pressure, and students can also pull, thereby personally experiencing the effect of the experiment; the inner and outer steel plates can allow combustion of combustible materials in the first or second sealed cavity, and the teaching aid is more heat-resistant. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The preferred structure of the present application is a whole state structure diagram;

[0016] Figure 2 The preferred structure of the present application is a main view state structure diagram;

[0017] Figure 3 The preferred structure of the present application is a cavity inner side main view;

[0018] In the drawings: 1, first sealed cavity, 2, second sealed cavity, 3, steel plate, 4, nut, 5, pull ring, 6, screw, 7, vent valve, 7-1, switch. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] Referring to Figure 1 and Figure 2The utility model discloses a mad town hemisphere experiment teaching aid, including first sealed cavity and second sealed cavity, and it is detachable structure between first sealed cavity and second sealed cavity, and the joint of between first sealed cavity and second sealed cavity is provided with sealing ring, such as silica gel ring or rubber ring, and the cavity inside and outside of first sealed cavity and second sealed cavity all are provided with steel sheet, and the both sides steel sheet is provided with screw nail through, and the outside screw nail of first sealed cavity and second sealed cavity is provided with the nut and fixes the inside and outside steel sheet, and the end of outside screw nail is provided with the pull ring, need to explain, and the screw nail on the two cavity outside has the thread, and the nut is fixed through the thread screw.

[0021] As the implementable mode, the sealing pad is arranged between the steel plate and the first and second sealed cavities, such as silica gel skin, to prevent the cavity from leaking.

[0022] As the implementable mode, the air vent valve is arranged on the first or second sealed cavity in the preferred scheme, and the air vent switch is arranged on the air vent valve.

[0023] In the further preferred scheme, the first and second sealed cavities are symmetrical structures, and the first and second sealed cavities are transparent plastic materials, such as transparent acrylic plates.

[0024] Specifically, the cross section of the first and second sealed cavities is a circular structure, and the steel plate is a disc.

[0025] In the further preferred scheme, the diameter of the inside steel plate of the first and second sealed cavities is smaller than the diameter of the cavity inside the first and second sealed cavities, and the diameter of the outside steel plate is smaller than or equal to the diameter of the inside steel plate, so as to facilitate the fixation of the outside nut and the observation of the changes inside the first and second sealed cavities.

[0026] As the implementable mode, the long ropes are connected to the two sides of the pull rings of the first and second sealed cavities, and the safety rope is arranged between the pull rings of the first and second sealed cavities, and the safety rope and the long ropes on both sides are one rope, and the safety rope part plays the role of safety protection against falling.

[0027] Further, the safety rope is connected between the pull rings on the first and second sealed cavities.

[0028] Embodiment: two sealed cavities are cut by a laser cutting machine from a 10mm transparent plastic plate (acrylic), a disc (diameter 230mm, center hole 10mm) and a (outer diameter 230mm, inner diameter 200mm) ring are pasted together (acrylic special glue, and the pasting force is strong, no air leakage), with ring screws through the center hole, the two sides of the plastic plate are clamped with stainless steel plates (2.0mm thick, 120mm in diameter, 80mm overlap, sealed between them with silicone rubber, air leakage prevention), increase the strength, prevent the plastic plate from being pressed and pulled. One of the sealed cavities increases a gas valve, the gas valve interface is a quick connector, which is convenient for air pipe connection. A 11-meter-long plastic rope with a diameter of 12mm is tied on the pull ring, a safety rope is set between the two rings to serve as an insurance function. If the first and second sealed cavities are pulled apart, it prevents people from falling. Use an electric or manual air pump to pump out the air in the box, the internal air pressure decreases, and the external atmospheric pressure will tightly press the two boxes together. Five or six primary school students on each side cannot pull it open. Open the air valve, air enters the box, and the box is easily pulled open.

[0029] Another embodiment is to burn paper and other combustibles in one of the sealed cavities, slowly cover the two sealed cavities, heat the air in the cavity when the paper burns, the air expands, part of the air is discharged from the cavity, after the two cavities are closed, the oxygen in the cavity is consumed due to the burning of the paper, and the paper is extinguished due to lack of oxygen. Therefore, the experimental device is transparent and has strong intuitiveness, not only showing that atmospheric pressure exists and has a large value, but also showing the laws of thermal expansion and contraction, and that material burning requires oxygen.

[0030] One or more embodiments of the present specification are intended to cover all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. made in the spirit and principles of one or more embodiments of the present specification should be included in the protection scope of the present disclosure.

Claims

1. A Magdeburg hemispheres teaching aid, comprising a first sealed cavity (1) and a second sealed cavity (2), the first sealed cavity and the second sealed cavity are detachable, a sealing ring is arranged between the first sealed cavity and the second sealed cavity, characterized in that, steel plates (3) are arranged on the inner side and the outer side of the first sealed cavity and the second sealed cavity, screw nails (6) are arranged through the two steel plates, nuts (4) are arranged on the screw nails on the outer side of the first sealed cavity and the second sealed cavity to fix the inner and outer steel plates, pull rings (5) are arranged on the end of the screw nails on the outer side, sealing pads are arranged between the steel plates and the first and second sealed cavities, an air valve (7) is arranged on the first or second sealed cavity, and an air switch (7-1) is arranged on the air valve.

2. The Magdeburg hemispheres teaching aid according to claim 1, wherein the first sealed cavity and the second sealed cavity are cylindrical cavity structures.

3. The Magdeburg hemispheres teaching aid according to claim 1, wherein the first sealed cavity and the second sealed cavity are symmetrical structures.

4. The Magdeburg hemispheres teaching aid according to claim 1, wherein the first and second sealed cavities are transparent plastic materials.

5. The Magdeburg hemispheres teaching aid according to claim 1, wherein the steel plates are disc-shaped.

2. The Magdeburg Hemisphere Teaching Aid of claim 1, wherein, 6. The Magdeburg hemispheres teaching aid according to claim 1, wherein the diameter of the inner steel plate of the first and second sealed cavities is smaller than the diameter of the cavity on the inner side of the first and second sealed cavities, and the diameter of the outer steel plate is smaller than or equal to the diameter of the inner steel plate.

3. The Magdeburg Hemisphere Teaching Aid of claim 2, wherein:

7. The Magdeburg hemispheres teaching aid according to claim 1, wherein long ropes are arranged on both sides of the pull rings of the first and second sealed cavities.

4. The Madelbrot Hemisphere Teaching Aid according to any one of claims 1-3, wherein, 8. The Magdeburg hemispheres teaching aid according to claim 1, wherein a safety rope is arranged between the pull rings of the first and second sealed cavities, and the safety rope and the long ropes on both sides are one rope.

5. The Magdeburg Hemisphere Teaching Aid of claim 4, wherein: ​ 6. The Magdeburg Hemisphere Teaching Aid of claim 5, wherein: ​ 7. The Magdeburg Hemisphere Teaching Aid of claim 6, wherein: ​ 8. The Magdeburg Hemisphere Teaching Aid of claim 4, wherein: ​ 9. The Magdeburg Hemisphere Teaching Aid of claim 8, wherein: ​

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