CN216486928U - Device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold - Google Patents
Device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold Download PDFInfo
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- CN216486928U CN216486928U CN202121817584.3U CN202121817584U CN216486928U CN 216486928 U CN216486928 U CN 216486928U CN 202121817584 U CN202121817584 U CN 202121817584U CN 216486928 U CN216486928 U CN 216486928U
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Abstract
The utility model discloses a device for teaching cold water heating and liquid and air expansion and contraction experiment. The utility model comprises an electronic balance, an electronic digital display thermometer and an electric heating device; the electric heating device is provided with a container, the container is movably connected with a sealing piece, and an injector is arranged in the sealing piece; and a probe of the electronic digital thermometer is arranged in the container after penetrating through the sealing piece. The utility model has the advantages of small experimental error, good safety, simple operation, more visual experimental phenomenon and the like.
Description
Technical Field
The utility model relates to the technical field of teaching aids, in particular to a device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold.
Background
The second unit of the textbook of the fifth grade of science of the primary school of the textbook is 'heating cold water', and the second unit mainly comprises two parts, namely heating cold water in a plastic bag and researching the change of the water in the heating process. The experimental teaching of this class aims at requiring the teacher to guide children to analyze the change that produces after the water heating from the factor that influences the object and sink and float in water to design the experiment, observe whether weight and volume have changed after the water is heated.
In order to verify the weight and volume changes of water during heating, the second part of the teaching material of the present class was designed with two experiments: experiment one, researching the weight change of water in the heating process; in the second experiment, the volume change of water in the heating process is researched, and then the experiment proves that the weight of the water is unchanged and the volume of the water is increased in the heating process, but in the long-term experiment teaching process, many problems are found to exist when children perform experiment operation according to a teaching material method, such as:
problem 1: the pan balance is not easy to operate with standardization. When the tray balance is used, large errors of experimental data are easily caused due to human reasons such as operation and observation methods of a user.
Problem 2: the heating method of the test tube on the alcohol lamp and the potential safety hazard of the alcohol lamp exist. When the test tube is placed on the alcohol lamp for heating, the test tube clamp is required to clamp the position which is one third away from the opening of the test tube, the test tube needs to be preheated firstly, meanwhile, the outer flame of the alcohol lamp needs to be used for heating, because more children participate in the experiment, in the operation process, the children can not use the alcohol lamp to heat the test tube according to strict experiment methods and steps, and the children often can heat the test tube for too long time due to curiosity, so that potential safety hazards exist.
Problem 3: the operation of leaving the inside of the test tube free from air is difficult. The test tube is controlled not to have air inside, the test tube mouth needs to be carefully sealed when sealed with the balloon skin, the better method in the teaching process is to completely submerge the whole test tube in water, then the test tube mouth is sealed with the balloon skin in water and then is fastened with a rubber band, but in the sealing process, students often seal not well enough, and more air bubbles exist, so that the rigidness of the experiment is influenced.
Due to the problems, if the teaching is continued according to the original experiment on the teaching materials, the operation of children is complicated, the efficacy is low, and the children can not achieve the experimental teaching target in the course of a class. In order to make classroom teaching more efficient, make the experimental phenomenon more obvious and improve the security when the student operates. There is a need for improvement and innovation of experimental devices on teaching materials.
Disclosure of Invention
The utility model aims to provide a device for teaching cold water heating and liquid and air expansion and contraction with heat. The utility model has the advantages of small experimental error, good safety, simple operation, more visual experimental phenomenon and the like.
The utility model adopts the following technical scheme to realize the purpose of the utility model:
a device for heating cold water and teaching experiments on expansion with heat and contraction with cold of liquid and air comprises an electronic balance, an electronic digital display thermometer and an electric heating device; the electric heating device is provided with a container, the container is movably connected with a sealing piece, and an injector is arranged in the sealing piece; and a probe of the electronic digital thermometer is arranged in the container after penetrating through the sealing piece.
In the device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold, the electric heating device is an electric food warmer.
In the device for cold water heating and liquid and air expansion and contraction experiment teaching, the asbestos net is arranged between the electric heating device and the container.
In the device for teaching cold water heating and liquid and air thermal expansion and cold contraction experiments, the container is a conical bottle; the seal is a rubber plug.
The device for teaching cold water heating and liquid and air expansion and contraction experiment further comprises a base; the electronic balance, the electronic digital display thermometer and the electric heating device are arranged on the base.
In the aforesaid be arranged in giving cold water heating, liquid and air expend with heat and contract with cold experiment teaching's device, electron digital display thermometer includes electron digital display main part, and data line one is connected to electron digital display main part, and data line one connects data line connector one, and data line connector one connects data line connector two, and data line connector two connects data line two, and data line two connects the probe.
In the device for teaching cold water heating and liquid and air expansion and contraction with heat and cold experiments, the base is provided with the data line support; the electronic digital display main body is arranged on the base, one end of the first data line connector is arranged in the base, and the other end of the first data line connector penetrates out of the top of the base and then is fixed on the data line support.
In the aforesaid be arranged in giving cold water heating, liquid and the device of the experimental teaching of shrinkage of expend with heat and contract with cold of air, electric heating device's power cord penetrates the base back and connects the wiring board of area earth leakage protection from the top of base, and the plug of the wiring board of area earth leakage protection is located outside the base.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model changes the tray balance on the teaching material experiment into the electronic balance, so that the operation is simpler and more convenient, the experiment error caused by people can be reduced, and the experiment time can be saved.
2. The utility model replaces the alcohol lamp with a more efficient, safer and uniformly heating electric heating device, and ensures the safety of the experimental process through the wiring board of the leakage protection device.
3. The utility model changes the device of the balloon skin sealing test tube in the teaching material experiment into the device of connecting a milliliter syringe by a conical flask, the syringe has good sealing performance, the sealing performance of the syringe is also good after the head end of the syringe is connected with a rubber plug, compared with the sealing mode of binding the balloon skin by a rubber ring, the utility model has better sealing performance and simpler operation, and when water is heated and expanded, the piston of the syringe naturally moves upwards, thus the experimental phenomenon that the volume is increased after the water is heated can be obviously observed.
4. The electronic digital display thermometer is used for replacing a thermometer in a teaching material experiment, data do not need to be read from the thermometer all the time, reading errors are avoided, and observation of changes of water temperature is more visual and intuitive.
5. The device of the utility model can be repeatedly used, and compared with a teaching material, the device has no consumables such as balloon skin and the like, and is more environment-friendly.
6. According to the utility model, through the design of the electronic digital display thermometer and the injector, the temperature change and the volume change of the water heating process can be more visually expressed, and the rigor of scientific experiment teaching can be embodied.
7. The utility model can be used for experiments of heating cold water, expansion and contraction of liquid and expansion and contraction of air, and the temperature change and volume change of liquid and air can be changed into visual in the experiment process, so that the experiment is more scientific and stricter compared with the experiment of the original teaching materials.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection structure of the probe.
Reference numerals: 1-an electronic balance; 2-electronic digital display thermometer; 3-an electric heating device; 4-a container; 5-a seal; 6-a syringe; 7-a probe; 8-a base; 9-electronic digital display main body; 10-data line one; 11-data line connector one; 12-data line connector two; 13-data line two; 14-a data line holder; 15-plug.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Examples are given. A device for cold water heating, liquid and air expansion with heat and contraction with cold experiment teaching, the structure is shown in figure 1-2, comprising an electronic balance 1, an electronic digital display thermometer 2 and an electric heating device 3; a container 4 is arranged on the electric heating device 3, a sealing piece 5 is movably connected on the container 4, and an injector 6 is arranged in the sealing piece 5; the probe 7 of the electronic digital thermometer 2 is arranged in the container 4 after penetrating the sealing member 5.
The electric heating device 3 is an electric cooker.
An asbestos net is arranged between the electric heating device 3 and the container 4.
The container 4 is a conical flask; the seal 5 is a rubber plug.
Also comprises a base 8; the electronic balance 1, the electronic digital display thermometer 2 and the electric heating device 3 are arranged on the base 8.
The electronic digital display thermometer 2 comprises an electronic digital display main body 9, the electronic digital display main body 9 is connected with a first data line 10, the first data line 10 is connected with a first data line connector 11, the first data line connector 11 is connected with a second data line connector 12, the second data line connector 12 is connected with a second data line 13, and the second data line 13 is connected with the probe 7.
A data line bracket 14 is arranged on the base 8; the electronic digital display main body 9 is arranged on the base 8, one end of the first data line connector 11 is arranged in the base 8, and the other end of the first data line connector is fixed on the data line support 14 after penetrating out of the top of the base 8. The first data line connector 11 can be fixed on the data line bracket 14 through a binding belt.
The power cord of the electric heating device 3 penetrates through the base 8 from the top of the base 8 and then is connected with the wiring board with the electric leakage protection, and the plug 15 of the wiring board with the electric leakage protection is arranged outside the base 8.
All the above parts are common structures of existing products and simple manufacture, such as: the electronic balance 1, the electronic digital display thermometer 2 and the electric heating device 3 are all existing devices and can be directly used by buying; the electronic digital display thermometer 2 can be charged by a battery or can be plugged by a plug, and if the plug is arranged, the plug is plugged into a patch board with leakage protection; the data line bracket 14 can be made of wood strips or iron wires; the base 8 is made of wood board and has a hollow structure, such as a box shape.
The above description is of the structure and partial function of the device, and when experiments are actually performed, it is further preferable to perform material preparation and device fabrication according to the following method.
1. Preparation of principal Material
The material comprises: the device comprises a wood board (used for manufacturing a base), 1 electronic balance, 1 250mL conical flask (container), 1mL injector, 1 electronic digital display thermometer, 1 rubber stopper (two holes need to be drilled according to a data line of the digital thermometer and the thickness of the injector), 1 split adjustable multipurpose electric heating pot (an electric heating device), 1 piece of asbestos net, 1 weight box, 1 plug board with electric leakage protection and one water tank (used for subsequently cooling the conical flask and the asbestos net after heating) filled with cold water.
2. The main manufacturing steps of the device
(1) An electric heating device is fixed on the wood board base, and then an electronic digital display thermometer is fixed.
(2) Two holes are punched on the rubber plug according to the thickness of a data line and an injector of the electronic digital display thermometer, one end of a probe (a temperature sensor) of the electronic digital display thermometer is inserted into the rubber plug, so that the end part of the probe is positioned in the conical flask, and the position of a gap between the probe and the rubber plug hole is sealed by silica gel.
(3) In order to conveniently remove the rubber plug, an interface (a first data line connector 11 and a second data line connector 12) is arranged on a data line of the electronic digital display thermometer at a position about 10 cm away from the rubber plug, so that the data line is divided into a first data line 10 and a second data line 13 which can be connected and disconnected through the interface.
(4) The Erlenmeyer flask, rubber stopper and 1ml syringe were assembled.
(5) The plug of the split adjustable multipurpose electric food warmer is inserted into the wiring board with the electric leakage protection, and the plug of the wiring board with the electric leakage protection penetrates out of the base (the power line interface of the wiring board is preferably arranged on the base in the arrangement mode).
The resulting device is shown in FIG. 1.
After the utility model is assembled according to the structural characteristics, materials and steps, the using method and the working principle of the experiment are as follows:
experiment on heating of Water for Cooling
1. Filling the conical bottle with water, plugging the bottle opening with a processed rubber plug, inserting an injector into the upper hole of the piston, wiping off water outside the device, and paying attention to the fact that air cannot exist in the bottle during operation;
2. turning on a power switch of the electronic balance, and using tweezers to take a 10-gram standard weight to test whether the electronic balance is accurately weighed, and debugging or replacing the electronic balance if the electronic balance is not accurately weighed;
3. lightly placing the conical flask on an electronic balance, and measuring and recording the weight of the conical flask at the moment;
4. placing an asbestos net on an electric heating plate of the split adjustable multipurpose electric food warmer, placing a conical flask on the asbestos net, connecting an interface of an electronic digital display thermometer (inserting a second data line connector 12 into a first data line connector 11), and reading and recording the temperature of water and the scale of the water surface in an injector at the moment;
5. opening a switch of the split adjustable multipurpose electric food warmer to the maximum, continuously heating for two minutes, and simultaneously observing the changes of the syringe piston and the thermometer;
6. after two minutes, the switch of the split adjustable multipurpose electric food warmer is turned off, and the temperature of the launching water and the scale of the movement of the piston in the injector are recorded;
7. taking down the plug of the electronic digital display thermometer, putting the conical flask on the electronic balance again for weighing, and recording the weighing result;
8. the flask was placed in a water bath to cool for one minute, and the syringe plunger was observed for changes while the scale of plunger movement was recorded.
The following are recordings of the actual teaching of the inventors using the utility model:
1. turning on a switch of the electronic balance, lightly placing the conical flask connected with the one-milliliter syringe on the electronic balance for weighing, and recording the weight before heating;
2. the interface of the temperature sensor is connected well, and the temperature of the water and the scale of the syringe piston at the moment are recorded.
3. The conical bottle is gently placed on the electric heating plate, the heating is continued for one minute, the electric heating plate is preheated in advance in order to save teaching time, in the observation process, water expands after being heated, the piston of the injector moves upwards, and children are informed that the volume of the water is increased after being heated;
4. after heating for one minute, the temperature of the launching water and the height of the piston moving are recorded again, the interface is disconnected, the conical flask is lightly placed on the electronic balance for weighing, the weight of the heated device is recorded, and comparison between the front data and the rear data (actual data are consistent) can tell children that the weight of the water cannot change in the heating process.
Therefore, the device can well teach the course of heating cold water and draw the conclusion that the volume of the water is increased but the weight of the water is not changed in the heating process.
The recording of experimental data can be performed by the following table 1.
TABLE 1 Cold water heating experiment recording table
(Note: the conclusion of this experiment does not take into account the conditions at 0 ℃ C. and below)
Second, make the experiment of "expansion with heat and contraction with Cold of liquid
As in the experiment of heating cold water, the conical flask is filled with liquid, then the piston of the injector is pulled out, the conical flask is placed on the electric heating plate for heating, and the interface of the digital display thermometer is connected, so that the conical flask can be used for the experiment of expansion with heat and contraction with cold of liquid in the third course of the second unit.
Third, make "expansion and contraction of air" experiment
The injector is connected with an empty conical flask, then the empty conical flask is placed on the electric heating plate for heating, and meanwhile, a connector of the digital display thermometer is connected, so that the test bed can be used for experiments of expansion and contraction of air in the fourth course of the second unit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (8)
1. The utility model provides a device for giving cold water heating, liquid and air expend with heat and contract with cold experiment teaching, its characterized in that: comprises an electronic balance (1), an electronic digital display thermometer (2) and an electric heating device (3); a container (4) is arranged on the electric heating device (3), a sealing piece (5) is movably connected on the container (4), and an injector (6) is arranged in the sealing piece (5); and a probe (7) of the electronic digital thermometer (2) penetrates through the sealing element (5) and then is arranged in the container (4).
2. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 1, wherein: the electric heating device (3) is an electric cooker.
3. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 1, wherein: an asbestos net is arranged between the electric heating device (3) and the container (4).
4. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 1, wherein: the container (4) is a conical flask; the sealing element (5) is a rubber plug.
5. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 1, wherein: also comprises a base (8); the electronic balance (1), the electronic digital display thermometer (2) and the electric heating device (3) are arranged on the base (8).
6. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 5, wherein: the electronic digital display thermometer (2) comprises an electronic digital display main body (9), the electronic digital display main body (9) is connected with a first data line (10), the first data line (10) is connected with a first data line connector (11), the first data line connector (11) is connected with a second data line connector (12), the second data line connector (12) is connected with a second data line (13), and the second data line (13) is connected with a probe (7).
7. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 6, wherein: a data line bracket (14) is arranged on the base (8); the electronic digital display main body (9) is arranged on the base (8), one end of the first data line connector (11) is arranged in the base (8), and the other end of the first data line connector penetrates out of the top of the base (8) and then is fixed on the data line support (14).
8. The device for teaching cold water heating, liquid and air thermal expansion and contraction experiment according to claim 5, wherein: the power cord of electric heating device (3) penetrates base (8) back connecting band earth leakage protection's wiring board from the top of base (8), and plug (15) of the wiring board of area earth leakage protection are located outside base (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121817584.3U CN216486928U (en) | 2021-08-05 | 2021-08-05 | Device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121817584.3U CN216486928U (en) | 2021-08-05 | 2021-08-05 | Device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold |
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| Publication Number | Publication Date |
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| CN216486928U true CN216486928U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121817584.3U Active CN216486928U (en) | 2021-08-05 | 2021-08-05 | Device for experiment teaching of cold water heating, liquid and air expansion with heat and contraction with cold |
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| CN (1) | CN216486928U (en) |
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- 2021-08-05 CN CN202121817584.3U patent/CN216486928U/en active Active
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