CN211857886U

CN211857886U - Heat conduction direction demonstration instrument

Info

Publication number: CN211857886U
Application number: CN202020508092.5U
Authority: CN
Inventors: 赵福来
Original assignee: NANNING BEIHULU PRIMARY SCHOOL
Current assignee: NANNING BEIHULU PRIMARY SCHOOL
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-11-03
Anticipated expiration: 2030-04-09

Abstract

The utility model discloses a heat-conduction direction demonstration appearance, it includes: the vertical plates are opposite, probe pins of a plurality of plug-in digital display thermometers are horizontally inserted between the vertical plates, and the plug-in digital display thermometers are positioned on the same plane and are uniformly arranged at intervals; the metal bar is placed on the probe pins of the plurality of inserted digital display thermometers, and a heat source is arranged below one end of the metal bar. The utility model discloses whole device simple structure, the experiment operation is also simple convenient, and the demonstration that simultaneously can also be simple swift shows heat-conduction process.

Description

Heat conduction direction demonstration instrument

Technical Field

The utility model relates to a teaching aid field. More specifically, the utility model relates to a heat-conduction direction demonstration appearance.

Background

When "how the heat transmits" study in the primary school science textbook, this textbook has designed such an experiment "do not separate certain distance on a section iron wire and just glue a match with the candle, fix the iron wire on the iron stand platform, the match all hangs down, gives the one end heating of iron wire with the alcohol burner, observes the match of which one end and drops earlier", but discovers in experimental teaching, accomplishes this experiment comparison difficulty in the classroom: 1. the match is stuck on the iron wire by the candle, and is difficult to stick stably in the sticking process; 2. the quantity of the wax used for sticking matches cannot be guaranteed to be the same for each match, and errors can occur in the experiment. 3. The test is long in use, and sometimes matches are not lost for more than ten minutes. Such experiments are difficult to be successfully completed in class, so that a demonstration instrument which can conveniently show the heat conduction process needs to be redesigned.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.

It is still another object of the present invention to provide a heat conduction direction demonstration apparatus, which is simple and fast to display the heat conduction process.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a heat conduction direction demonstrator including:

the vertical plates are opposite, probe pins of a plurality of plug-in digital display thermometers are horizontally inserted between the vertical plates, and the plug-in digital display thermometers are positioned on the same plane and are uniformly arranged at intervals;

the metal bar is placed on the probe pins of the plurality of inserted digital display thermometers, and a heat source is arranged below one end of the metal bar.

Preferably, the heat source is a candle or an alcohol lamp.

Preferably, a vertical end plate is connected between the ends of the pair of opposite vertical plates far away from the heat source, and one end of the metal rod far away from the heat source is detachably connected to the end plate.

Preferably, a threaded hole is formed in the end plate, and an external thread matched with the threaded hole is arranged at one end, far away from the heat source, of the metal rod.

Preferably, a plurality of thermistor switches are adhered to the metal bar at regular intervals along the length direction by using heat conducting glue, each thermistor and a small bulb are connected in series to form a group, and the plurality of thermistors and the small bulb group are connected in parallel between a positive electrode and a negative electrode of a battery pack.

Preferably, the battery pack is fixed on the outer wall of a vertical plate, a transparent cover plate covers the top ends of the two vertical plates, and the small bulb is fixedly arranged on the transparent cover plate.

The utility model discloses at least, include following beneficial effect: because the heat is transmitted in the metal in a heat conduction mode, the heat is expressed in a temperature form, and the heat transmission is the temperature transmission, the temperature of different positions of the metal bar can be measured simultaneously by a plurality of thermometers, and the heat conduction direction can be judged by comparing the readings.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a top view of an embodiment of the present invention;

fig. 2 is a side view of one embodiment of the present invention;

fig. 3 is a top view of another embodiment of the present invention;

fig. 4 is a circuit diagram of another embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-2, the utility model provides a heat conduction direction demonstration appearance, it includes:

a pair of opposite vertical plates 1, wherein probe pins of a plurality of plug-in digital display thermometers 3 are horizontally inserted between the vertical plates, and the plug-in digital display thermometers 3 are positioned on the same plane and are uniformly arranged at intervals;

in the embodiment, the vertical plates 1 are wood plates and have the height of 12cm, the two vertical plates 1 are vertically and oppositely fixed on a

bottom plate

2, 6 pairs of through holes are formed in the two vertical plates 1 along the horizontal straight line direction, each pair of through holes are respectively positioned on different vertical plates 1, the hole diameters are the same, the heights are the same, the positions are opposite, the distance between every two adjacent through holes on the same vertical plate 1 is 4cm, a probe pin of an inserted digital display thermometer 3 is inserted into each pair of through holes, thus the probe pins of the 6 inserted digital display thermometers 3 are positioned on the same horizontal plane and are parallel to each other, and the distance between every two adjacent probe pins is;

the metal bar 4 is placed on probe pins of the plurality of inserted digital display thermometers 3, and a heat source is arranged below one end of the metal bar 4. The metal rod 4 may be made of a relatively easily available iron or steel rod, and a candle 5 or an alcohol lamp may be used to heat the metal rod 4 below one end thereof.

Because the heat is transmitted in the metal in a heat conduction mode, the heat is expressed in the form of temperature, and the heat transmission is the temperature transmission, the temperatures of different positions of the metal rod 4 are measured simultaneously by a plurality of thermometers, and the heat conduction direction can be judged by comparing the readings.

The reason why the glass thermometer is not used here is that the glass thermometer needs a certain time to obtain the reading, when different positions are measured, a period of time is spent for observing and reading each thermometer reading, experimental errors can be caused due to the fact that the period of time is different, the digital display thermometer is inferior to the digital display thermometer, each thermometer reading can be obtained intuitively at the same time, and the result is more accurate.

In another embodiment, the heat source is a candle 5 or alcohol burner, which are more commonly used in laboratories and more readily available.

In another embodiment, a vertical end plate 6 is connected between the ends of the pair of opposite vertical plates 1 far away from the heat source, and one end of the metal rod 4 far away from the heat source is detachably connected to the end plate 6, so that the metal rod 4 can be fixed, and the metal rod 4 is prevented from rolling in the heating process to cause experiment failure.

In another embodiment, a threaded hole is formed in the end plate 6, an external thread matched with the threaded hole is formed in one end, away from the heat source, of the metal rod 4, and the metal rod 4 and the end plate 6 are fixed in a threaded connection mode, so that the metal rod is easy to process, and meanwhile, the metal rod is convenient to disassemble.

In another embodiment, as shown in fig. 3-4, a plurality of thermistor switches 7 are adhered to the metal bar 4 along the length direction at regular intervals by using heat-conducting glue, each thermistor switch 7 is connected with a small bulb 8 in series to form a group, and the plurality of thermistor switches 7 and the small bulb 8 are connected in parallel between the positive and negative electrodes of a battery pack 9.

In this embodiment, the threshold temperature of the thermistor switch 7 is 30 ℃, when the temperature transmitted to the thermistor switch 7 on the metal bar 4 is higher than 30 ℃, the thermistor switch 7 is closed, otherwise the thermistor switch 7 is opened, and the battery pack 9 is formed by connecting two batteries of No. 5 in series.

Because the temperature of the metal rod 4 close to one end of the heat source rises firstly in the heat conduction process, the thermistor switch 7 at one end of the heat source reaches the threshold temperature firstly and is closed, and the thermistor switch 7 gradually far away from the heat source sequentially reaches the threshold temperature and is closed in the heat conduction process from one end of the metal rod 4 close to the heat source to the end far away from the heat source, so that the small bulbs 8 are sequentially lighted one by one, the heat conduction process is visually expressed, and meanwhile, the experiment process is more interesting.

In another embodiment, the battery pack 9 is fixed on the outer wall of one vertical plate 1, the top ends of the two vertical plates 1 are covered with a transparent cover plate 10, and the small bulb 8 is fixedly arranged on the transparent cover plate 10, so that the transparent cover plate 10 can cover the metal rod 4, reduce heat loss on the metal rod 4, and conveniently fix the small bulb 8.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims

1. Heat conduction direction demonstration appearance, its characterized in that includes:

2. A heat conduction direction demonstrator as claimed in claim 1 wherein said heat source is a candle or alcohol burner.

3. A heat conduction direction demonstrator as claimed in claim 1 wherein a vertical end plate is connected between the ends of said pair of opposed risers remote from said heat source, said end of said metal rod remote from said heat source being removably connected to said end plate.

4. A heat conduction direction demonstrator as claimed in claim 3 wherein said end plate is provided with a threaded aperture and the end of said metal rod remote from said heat source is provided with external threads matching said threaded aperture.

5. A heat transfer direction demonstrator as claimed in claim 3 wherein said metal bar has a plurality of thermistor switches adhered thereto at regular intervals along its length by a thermally conductive adhesive, each thermistor switch being connected in series with a small bulb to form a group, the plurality of thermistor switches and the small bulb group being connected in parallel between the positive and negative electrodes of a battery pack.

6. A heat conduction direction demonstrator as claimed in claim 5 wherein said battery pack is mounted to the outer wall of a vertical plate, the top of each vertical plate being covered by a transparent cover plate, said small bulb being mounted to said transparent cover plate.