CN210777429U - Experimental device for convection phenomenon exploration - Google Patents
Experimental device for convection phenomenon exploration Download PDFInfo
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- CN210777429U CN210777429U CN201921328638.2U CN201921328638U CN210777429U CN 210777429 U CN210777429 U CN 210777429U CN 201921328638 U CN201921328638 U CN 201921328638U CN 210777429 U CN210777429 U CN 210777429U
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- 238000010438 heat treatment Methods 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000000523 sample Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides an experimental apparatus for convection phenomenon is explored and is used, including obturator box and detection device, the obturator box is including the heating pipe that is located obturator box middle part, the heating switch is connected in the heating pipe and is located the outside of obturator box, the obturator box is located the top of heating pipe and has seted up first inspection hole, the obturator box is located the below of heating pipe and has seted up the second inspection hole, detection device is including connecting respectively in the first temperature sensor and the second temperature sensor of controller, the controller is connected with the display, the temperature-sensing probe of first temperature sensor is located first inspection hole and is in place to detect the temperature in obturator box upper portion space, the temperature-sensing probe of second temperature sensor is located the temperature that second inspection hole is in place to detect obturator box lower part space. The utility model provides an experimental apparatus for be used for specially teaching for exploring air convection phenomenon, temperature variation shows in real time, and the experimenter of being convenient for observes and takes notes.
Description
Technical Field
The utility model belongs to the technical field of experiment teaching equipment, especially, relate to an experimental apparatus is used in probing of convection phenomenon.
Background
The process of heat transfer by macroscopic flow of fluid (gas or liquid) through its parts is known. Convection is the primary means of heat transfer for fluids because the thermal conductivity of fluids is small and the amount of heat transferred by heat conduction is small.
However, the prior art does not have a convection phenomenon experimental device specially used for teaching, which is not beneficial to understanding of the nature of the convection phenomenon by students. In addition, the experimental modes in the prior art only prove that the fluid flows to the lower temperature side, and the fluid with higher temperature in the middle part can not be observed visually or proved to flow upwards more easily under the same condition, and the temperature change condition of the fluid at each part can not be seen.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide an experimental apparatus for investigation of convection phenomenon.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides an experimental apparatus for convection phenomenon is explored and is used, includes obturator box and detection device, the obturator box is including being located the heating pipe at obturator box middle part, heating switch connect in the heating pipe just is located the outside of obturator box, the obturator box is located first inspection hole has been seted up to the top of heating pipe, the obturator box is located the second inspection hole has been seted up to the below of heating pipe, detection device is including connecting respectively in the first temperature sensor and the second temperature sensor of controller, the controller is connected with the display, the temperature-sensing probe of first temperature sensor is located first inspection hole is in order to detect the temperature in obturator box upper portion space, the temperature-sensing probe of second temperature sensor is located the second inspection hole is in order to detect the temperature in obturator box lower part space.
In the experimental device for studying the convection phenomenon, the heating switch is a relay switch, a relay coil of the relay switch and a switch device are connected in series in a relay power supply loop, and a normally open contact of the relay switch and the heating pipe are connected in series in a heating pipe power supply loop.
In the experimental device for studying the convection phenomenon, the switch comprises a triode, an emitter and a collector of the triode are connected in series in a relay power supply loop, and a base of the triode is connected to the controller.
In the experimental device for exploring the convection phenomenon, the heating pipe is provided with a third temperature sensor, the third temperature sensor is connected to the controller, and the controller is connected with a temperature threshold setting button.
In the experimental device for studying the convection phenomenon, the first detection hole and the second detection hole are symmetrically arranged relative to the heating pipe.
In the experimental apparatus for exploring the convection phenomenon, the first detection hole and the second detection hole of the sealing device box are communicated through a communication pipe, an output line of the first temperature sensor penetrates through the first through hole to the outside of the sealing device box, and an output line of the second temperature sensor penetrates through the second through hole to the outside of the sealing device box.
In the experimental device for exploring the convection phenomenon, the inner wall or the outer wall of the communication pipe and the inner wall or the outer wall of the sealing device box are covered with the heat insulation layers.
In the experimental device for exploring the convection phenomenon, the heat exchange tube is coated outside the middle part of the communicating tube, the heat exchange tube is provided with an air inlet and an air outlet, the air inlet is connected with an air cooler, and the communicating tube is located at the position of the heat exchange tube without a heat insulation layer.
The utility model has the advantages that: the experiment device which is specially used for teaching and used for exploring the phenomenon of air convection is provided, the temperature change is displayed in real time, and the observation and the recording of experimenters are convenient; the structure is simple, and the experiment is convenient; it is not only possible to verify that the fluid flows to the lower temperature side, but also to visually observe that the fluid having a higher temperature in the middle portion flows upward more easily under the same conditions.
Drawings
Fig. 1 is a schematic structural diagram of an experimental apparatus for exploring convection phenomenon according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit connection between a heating switch and a heating tube EH1 according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit connection between a heating switch and a heating tube EH1 according to a second embodiment of the present invention;
fig. 4 is a circuit connection block diagram in the second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an experimental apparatus for exploring convection phenomenon in the third embodiment of the present invention.
Reference numerals: a sealing device case 1; a first detection hole 11; a second detection hole 12; a controller 2; a first temperature sensor 3; a second temperature sensor 4; a display 5; a third temperature sensor 6; a communicating pipe 7; a heat exchange pipe 8; an air inlet 81; heating tube EH 1; a relay coil KM 1; a switch S1; a transistor Q1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
As shown in fig. 1, the present embodiment discloses an experimental apparatus for exploring convection phenomenon, comprising a sealing apparatus box 1 and a detection apparatus, wherein the sealing apparatus box 1 comprises a heating pipe EH1 located at the middle of the sealing apparatus box 1, the heating pipe EH1 is connected to a heating switch, and the heating switch is located outside the sealing apparatus box 1. The sealing device box 1 is of a rectangular structure and comprises a device body and a sealing door (not shown) located on the front side of the device body, the sealing door is connected with the device body in a hinged or clamping mode, axial strips can be arranged on the inner walls of the two sides of the front side of the device body, and the two sides of the sealing door are inserted into the two axial strips from the top and move downwards to the lower end to form the sealing device box. Preferably, the inner wall or the outer wall of the sealing device box is covered with a heat preservation layer to avoid heat loss, so that the experimental effect is improved.
Furthermore, a first detecting hole 11 is formed in the sealing device box 1 above the heating pipe EH1, a second detecting hole 12 is formed in the sealing device box 1 below the heating pipe EH1, and the first detecting hole 11 and the second detecting hole 12 are symmetrically arranged with respect to the heating pipe EH 1. The detection device comprises a first temperature sensor 3 and a second temperature sensor 4 which are respectively connected to the controller 2, the controller 2 is connected with a display 5, the display 5 is used for respectively displaying the detection temperatures of the first temperature sensor 3 and the second temperature sensor 4, a temperature sensing probe of the first temperature sensor 3 is positioned at the first detection hole 11 to detect the temperature of the upper space of the sealing device box 1, and a temperature sensing probe of the second temperature sensor 4 is positioned at the second detection hole 12 to detect the temperature of the lower space of the sealing device box 1. The controller can use a PLC or a single chip microcomputer, for example, a 8751 single chip microcomputer, etc., the temperature sensor can use a temperature sensor with a model ds18b20, and the plurality of temperature sensors can be different models or the same model.
By arranging the first and second detection holes 11 and 12 symmetrically above and below the heater pipe EH1, the distances between the first and second temperature sensors 3 and 4 and the heater pipe EH1 are made to coincide, and thus the temperature change comparison between the upper and lower portions of the heater pipe EH1 can be performed more accurately.
Specifically, as shown in fig. 2, the heating switch is a relay switch, a relay coil KM1 of the relay switch and a switch S1 of the relay switch are connected in series in a relay power supply loop, and a normally open contact K1 of the relay switch and a heating pipe EH1 of the relay switch are connected in series in a heating pipe EH1 power supply loop. The relay power supply circuit of the embodiment is supplied with 5V direct current, and the heating pipe EH1 power supply circuit determines corresponding direct current power supply or alternating current power supply according to the model of the heating pipe EH 1. And closing the switch S1, heating the heating pipe EH1, opening the switch S1 and stopping heating the heating pipe EH 1.
When the experiment is performed by the experimental apparatus, it can be observed that the temperatures detected by the first temperature sensor 3 located above and the second temperature sensor 4 located below gradually increase with the continuous heating of the heating pipe EH1, so it can be known that the hot air at the heating pipe EH1 convects upward and downward at the same time, and the temperature detected by the first temperature sensor 3 is gradually greater than the temperature detected by the second temperature sensor 4, and the difference is increasingly large, that is, the upper temperature rises faster, and the lower temperature rises slower, so it can be known that the fluid with the higher middle temperature flows upward more easily.
Example two
As shown in fig. 3 and 4, the present embodiment is similar to the present embodiment, except that the switch S1 of the present embodiment includes a transistor Q1, an emitter and a collector of the transistor Q1 are connected in series in the relay power supply circuit, and a base of the transistor Q1 is connected to the controller 2. And a third temperature sensor 6 for detecting the temperature of the heating pipe EH1 is provided at the heating pipe EH1, the third temperature sensor 6 is connected to the controller 2, and a temperature threshold setting button is connected to the controller 2, and the display 5 can be used for simultaneously displaying the detected temperature of the third temperature sensor 6. The temperature threshold setting button is used to set the maximum temperature threshold and the minimum temperature threshold to keep the temperature inside the enclosure 1 within the temperature range of the maximum temperature threshold and the minimum temperature threshold, i.e., to reach a constant temperature state. When the detected temperature of the third temperature sensor 6 reaches the maximum temperature threshold, the controller 2 controls the normally open contact K1 of the relay to be disconnected, the heating pipe EH1 stops heating, the relay coil KM is powered on when the detected temperature is lower than the minimum temperature threshold, and the heating pipe EH1 continues heating. The mode that the temperature threshold setting button sets the highest temperature threshold and the lowest temperature threshold and the mode that the controller controls the heating pipe EH1 to heat or disconnect according to the detected temperature, the highest temperature threshold and the lowest temperature threshold can be realized by adopting the prior art. Here, the purpose of constant temperature is achieved by controlling the power of the heating pipe EH1, and during actual use, the purpose of constant temperature may also be achieved by controlling the power of the heating pipe EH1, for example, in the current electric oven, and the specific implementation manner is not described herein.
This embodiment can realize keeping the temperature in airtight control box 1 at a constant temperature, reaches after the constant temperature period, can see the temperature value that first temperature sensor 3 of second temperature sensor 4 detected and approach gradually, can know the lower air convection of top high temperature air simultaneously temperature below.
EXAMPLE III
As shown in fig. 5, the present embodiment is similar to the present embodiment, except that the first detection hole 11 and the second detection hole 12 of the enclosure box 1 of the present embodiment are communicated through a communication pipe 7, the output line of the first temperature sensor 3 is inserted through the first through hole to the outside of the enclosure box 1, and the output line of the second temperature sensor 4 is inserted through the second through hole to the outside of the enclosure box 1.
Similarly, the inner wall or the outer wall of communication pipe 7 is also covered with an insulating layer.
Preferably, 7 middle part outsourcing of communicating pipe has heat exchange tube 8, heat exchange tube 8 has air intake 81 and air outlet, air intake 81 is connected with the air-cooler, just communicating pipe 7 is located 8 no heat preservation settings of heat exchange tube department use air-cooler 81 to accelerate the temperature variation speed of air current in the communicating pipe, make the contrast between top temperature and the below temperature more obvious, enlarge the experiment effect, be convenient for observe and the record realization phenomenon.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the enclosure box 1 is used more herein; heating tube EH 1; a first detection hole 11; a second detection hole 12; a first temperature sensor 3; a second temperature sensor 4; a controller 2; a display 5; a relay coil KM 1; a switch S1; a transistor Q1; a third temperature sensor 6; a communicating pipe 7; a heat exchange pipe 8; the air inlet 81, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (8)
1. The experimental device for exploring the convection phenomenon is characterized by comprising a sealing device box (1) and a detection device, wherein the sealing device box (1) comprises a heating pipe (EH1) positioned in the middle of the sealing device box (1), a heating switch is connected to the heating pipe (EH1) and positioned outside the sealing device box (1), the sealing device box (1) is positioned above the heating pipe (EH1) and is provided with a first detection hole (11), the sealing device box (1) is positioned below the heating pipe (EH1) and is provided with a second detection hole (12), the detection device comprises a first temperature sensor (3) and a second temperature sensor (4) which are respectively connected to a controller (2), the controller (2) is connected with a display (5), a temperature sensing probe of the first temperature sensor (3) is positioned at the first detection hole (11) to detect the temperature of the upper space of the sealing device box (1), the temperature sensing probe of the second temperature sensor (4) is positioned at the second detection hole (12) to detect the temperature of the space at the lower part of the sealing device box (1).
2. The experimental apparatus for research on convection phenomenon according to claim 1, wherein the heating switch is a relay switch, a relay coil (KM1) of the relay switch and a switch (S1) are connected in series in a relay power supply loop, and a normally open contact (K1) of the relay switch and a heating tube (EH1) are connected in series in a heating tube (EH1) power supply loop.
3. The experimental apparatus for studying convection phenomenon of claim 2, wherein said switch (S1) comprises a transistor (Q1), an emitter and a collector of said transistor (Q1) are connected in series in a relay power supply circuit, and a base of said transistor (Q1) is connected to said controller (2).
4. The experimental apparatus for studying convection phenomenon according to claim 3, wherein the heating pipe (EH1) has a third temperature sensor (6), the third temperature sensor (6) is connected to the controller (2), and a temperature threshold setting button is connected to the controller (2).
5. The experimental apparatus for studying convection phenomenon according to claim 1, wherein the first detecting hole (11) and the second detecting hole (12) are symmetrically disposed with respect to the heating pipe (EH 1).
6. The experimental apparatus for studying convection phenomenon according to claim 5, wherein the first detecting hole (11) and the second detecting hole (12) of the enclosure box (1) are communicated through a communicating pipe (7), and the output line of the first temperature sensor (3) is inserted to the outside of the enclosure box (1) through the first via hole, and the output line of the second temperature sensor (4) is inserted to the outside of the enclosure box (1) through the second via hole.
7. The experimental apparatus for studying convection phenomenon according to claim 6, wherein the communicating pipe (7) and the inner wall or the outer wall of the enclosure box (1) are covered with an insulating layer.
8. The experimental device for studying convection phenomenon according to claim 7, wherein a heat exchange tube (8) is coated outside the middle of the communication tube (7), the heat exchange tube (8) has an air inlet (81) and an air outlet, the air inlet (81) is connected with an air cooler, and the communication tube (7) is located at the heat exchange tube (8) without an insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921328638.2U CN210777429U (en) | 2019-08-15 | 2019-08-15 | Experimental device for convection phenomenon exploration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921328638.2U CN210777429U (en) | 2019-08-15 | 2019-08-15 | Experimental device for convection phenomenon exploration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210777429U true CN210777429U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921328638.2U Expired - Fee Related CN210777429U (en) | 2019-08-15 | 2019-08-15 | Experimental device for convection phenomenon exploration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210777429U (en) |
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2019
- 2019-08-15 CN CN201921328638.2U patent/CN210777429U/en not_active Expired - Fee Related
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Granted publication date: 20200616 |