CN213424345U

CN213424345U - Specific heat capacity demonstrator

Info

Publication number: CN213424345U
Application number: CN202022294931.0U
Authority: CN
Inventors: 董占江
Original assignee: Beijing Yanshi Zhongfa Technology Co ltd
Current assignee: Beijing Yanshi Zhongfa Technology Co ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-06-11
Anticipated expiration: 2030-10-15

Abstract

The utility model discloses a specific heat capacity demonstration ware, include: a support; a housing mounted on the support; a pair of fixing clips installed on the front panel of the casing; a pair of containers for holding liquid, which are clamped on the pair of fixing clamps; a pair of heating elements inserted on a pair of containers for heating the liquid in the corresponding containers; a pair of temperature detecting elements inserted on the pair of containers for detecting the temperature of the liquid in the corresponding containers; a pair of digital display thermometers which are correspondingly connected with the pair of temperature detection elements and are used for displaying corresponding temperatures; and the power supply and control module is respectively and electrically connected with the pair of heating elements, the pair of temperature detection elements and the pair of digital display thermometers. The utility model discloses a specific heat capacity demonstration ware, simple structure, convenient operation can realize heating simultaneously two sets of different liquid, but two kinds of liquid experimental data of single experiment real-time recording, and experimental data shows in real time, and the visual observation of being convenient for saves the teaching time.

Description

Specific heat capacity demonstrator

Technical Field

The utility model relates to a teaching aid technical field especially relates to a specific heat capacity demonstration ware.

Background

In the current teaching, specific heat capacity experimental apparatus adopts the heating of alcohol burner or adopts the heating of low pressure series resistance wire, and the unable stable control of alcohol burner heating is the same in the heat that emits in the same time, and low voltage power supply series resistance wire heating is owing to adopt low voltage power supply to the resistance wire is established ties, and the heat that every resistance wire emitted is little, and it is little to lead to equipment, and heat time is long, thereby influences the experiment effect.

In addition, the temperature of the conventional specific heat capacity experimental equipment is generally measured by using a common red water thermometer or an electronic thermometer, and the red water thermometer is long in temperature confirmation time, delayed and not easy to read. The simple electronic thermometer can display the temperature in a digital mode, but only displays real-time, but cannot pause heating and simultaneously displays the experiment time of a pause point.

Moreover, the low voltage power supply that current specific heat capacity experimental facilities adopted is although safe, but equipment is small or heating time is long, has influenced the student and has watched the effect of experiment, has also increased the experimental time.

Disclosure of Invention

The utility model aims at solving the above problem, provide a specific heat capacity demonstration ware, its simple structure, convenient operation can realize heating simultaneously two sets of different liquid, but two kinds of liquid experimental data of single experiment real-time recording, and experimental data shows in real time, and the visual observation of being convenient for saves the teaching time.

In order to realize the above object of the present invention, the utility model provides a specific heat capacity demonstration ware, it includes: a support; a housing mounted on the support; a pair of fixing clips installed on the front panel of the casing; a pair of containers for holding liquid, which are clamped on the pair of fixing clamps; a pair of heating elements inserted on a pair of containers for heating the liquid in the corresponding containers; a pair of temperature detecting elements inserted on the pair of containers for detecting the temperature of the liquid in the corresponding containers; a pair of digital display thermometers which are correspondingly connected with the pair of temperature detection elements and are used for displaying corresponding temperatures; and the power supply and control module is respectively and electrically connected with the pair of heating elements, the pair of temperature detection elements and the pair of digital display thermometers.

Wherein the heating element has an annular tube with an outer diameter smaller than an inner diameter of the container.

Preferably, the heating element has a straight tube perpendicularly connected to an annular tube.

Furthermore, the heating device also comprises a container cover which is detachably arranged at the opening at the top of the container, and the container cover is provided with a first through hole for the straight pipe of the heating element to pass through.

Preferably, the container cover is further provided with a second through hole for the temperature detection element to pass through, and the second through hole is located in the center of the container cover.

Preferably, the fixing clip is a ring-shaped clip and is detachably mounted on the front panel.

Compared with the prior art, the utility model discloses a specific heat capacity demonstration has following advantage:

the utility model discloses a specific heat capacity demonstration ware, simple structure, convenient operation can realize heating simultaneously two sets of different liquid, but two kinds of liquid experimental data of real-time recording are tested to the single, but experimental data real-time display delay control, not only directly perceived, more save teaching time, can obtain the effect of doing the best and getting doubly.

The present invention will be described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a specific heat capacity demonstrator in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a heating element according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a demonstration device according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1, for the utility model provides a structure schematic diagram of specific heat capacity demonstration ware, can know by fig. 1, the utility model discloses specific heat capacity demonstration ware includes: a support; a housing mounted on the support; a pair of fixing clips installed on the front panel of the casing; a pair of containers for holding liquid, which are clamped on the pair of fixing clamps; a pair of heating elements inserted on a pair of containers for heating the liquid in the corresponding containers; a pair of temperature detecting elements inserted on the pair of containers for detecting the temperature of the liquid in the corresponding containers; a pair of digital display thermometers which are correspondingly connected with the pair of temperature detection elements and are used for displaying corresponding temperatures; and the power supply and control module is respectively and electrically connected with the pair of heating elements, the pair of temperature detection elements and the pair of digital display thermometers.

Specifically, support 1 is enclosed by the horizontal plate and a pair of curb plate that is located the horizontal plate both sides, and the casing 11 of demonstration ware is installed in the cavity that is enclosed by horizontal plate and a pair of curb plate, supports whole demonstration ware through support 1, makes the demonstration ware stand upright in the desktop, remains stable during the experiment.

A pair of fixing clips 2 are attached to a front panel of the cabinet 11, and a container 7 for containing liquid is clamped to each fixing clip 2.

The fixing clip 2 can be detachably mounted on the front panel, for example, by bolts, or can be non-detachably mounted on the front panel. When the container 7 is designed, the fixing clamp can be a ring-shaped fixing clamp, and in order to clamp the container 7, the fixing clamp 2 can be a fixing clamp with an opening. Alternatively, the fixing clip 2 may be made of rubber having a certain shrinkage property. The inner ring of the retaining clip may be dimensioned slightly smaller than the outer diameter of the container 7 in order to clamp the container 7. In the specific heat capacity experiment, along with the increase to liquid heating time in the container 7, liquid temperature increases gradually, but the fixation clamp fastening container to prevent it from droing, guarantee the experiment security.

The container 7 can be a beaker which is commonly used in a laboratory, and the two containers can contain the same or different liquids. A heating element 8 is inserted in each container 7 and is used for heating the liquid in the container 7 so as to demonstrate the specific heat capacity of the liquid through the heated temperature and time of the liquid.

In addition, a temperature detection element 5 for detecting the temperature of the liquid in the container is inserted on each container, and each temperature detection element is connected with a digital display thermometer 3 for displaying the temperature detected by the temperature detection element. Correspondingly, the pair of heating elements, the pair of temperature detecting elements and the pair of digital display thermometers are respectively and electrically connected with the power supply and the control module, the circuit of the control module is a circuit which can be realized by a person skilled in the art, and the circuit principle is shown in fig. 3.

In order to prevent the liquid in the container 7 from splashing, a container cover 9 is detachably arranged at the opening at the top of the container 7, and the container cover 9 can be arranged at the top of the container 7 in a buckling mode, can be arranged at the top of the container 7 in a plug-in mode, and can be arranged at the top of the container 7 in a threaded connection mode. The container cover 9 can be made of materials with low heat conduction, such as rubber, and can also be a wooden plug, so that the opening of the container 7 is sealed, the heat preservation effect is good, and the situation that an experimenter is scalded due to overhigh temperature of the container cover can be avoided. Preferably, adopt the rubber buffer, because the leakproofness when rubber lid and container contact is better than other materials, can effectively prevent in the experimentation that the liquid in the container overflows the container because of heating temperature is too high to cause the emergence of experimental accident condition.

In order to insert the heating element 8 and the temperature detection element 5 into the container 7, correspondingly, a first through hole and a second through hole are formed in the container cover 9, the first through hole is used for the heating element 8 to pass through, and the second through hole is used for the temperature detection element 5 to pass through.

Wherein the heating element 8 is constructed as shown in fig. 2, and comprises a ring-shaped pipe 83, and the outer diameter of the ring-shaped pipe 83 is slightly smaller than the inner diameter of the container 7, so that the ring-shaped pipe 83 can extend into the bottom of the container 7. In addition, the heating element comprises a straight tube 82 perpendicular to the plane of the annular tube 83 and fixedly connected to it at its lower end, the straight tube 82 passing through a first through hole of the container lid 9. When in design, the heating element 8 can adopt an electric heating wire, the height needs to be reasonably set, after the heating element 8 is inserted into the container 7, the annular pipe is almost contacted with the bottom of the container 7, so that when in heating, the annular pipe is uniformly contacted with the bottom of liquid in the container 7, and the annular pipe is adopted, so that the contact area of the annular pipe and the liquid is increased, and the temperature rise in the liquid is more uniform.

In addition, in order to maintain a predetermined height after the straight tube of the heating element 8 is inserted into the first through hole of the container cover 9, a cap 81 is further installed at the end of the straight tube 82, and the cap 81 has an outer diameter larger than the diameter of the first through hole and is connected to the straight tube 82 by means of insertion and screw connection.

In the design, in order to make the temperature of the heated liquid in the container detected by the temperature detection element 5 more reasonable, the second through hole on the container cover 9 is arranged at the center of the container cover 9. And the first through hole is positioned at one side of the second through hole. Therefore, the temperature detection element 5 can be positioned in the center of the annular pipe of the heating element 8 after passing through the second through hole on the container cover 9, so that the phenomenon that experimental temperature data is higher or inaccurate due to the fact that the distance between the temperature detection element 5 and the heating element is too close is effectively avoided. The temperature detecting element 5 may employ a thermometer sensor probe of the related art.

The utility model discloses a digital display thermometer 3 is for having the digital display thermometer of sensor, can show in real time and is surveyed the liquid temperature change, adopts the digital display thermometer for it is more directly perceived to observe during the temperature change. The power socket 4 on the casing connected with the power supply adopts a hidden socket, so that the safety and the convenience are improved.

In addition, a digital display timer 6 is arranged on the casing, has a delay control function, can delay and control the heating element to heat the liquid, and can directly display the heating time. In the experimental process, an experimenter can record the real-time liquid temperature at different time points, so that the real-time data can be recorded more conveniently, and the convenience of recording and the accuracy of the real-time data are basic requirements for success of the experiment and drawing of an experiment curve.

The utility model discloses a specific heat capacity demonstration ware can carry out the concurrent heating to different liquid in two containers through two heating element, and the experiment can two kinds of liquid specific heat capacity's of real-time recording relevant experimental data once, and experimental data shows not only directly perceived in real time, more saves the teaching time, has made the effect that makes a lot of effort doubly.

Below, the preparation and process of the experiment demonstration performed by the specific heat capacity demonstrator with a structure of the present invention are described.

The utility model discloses specific heat capacity demonstration ware is by digital display time-recorder accurate control, and digital display thermometer shows the temperature. The same or different liquids are compared in a unit time, and the heating process of the temperature change of the liquids for each period of time is observed for comparison.

The heating mode is that the nickel-chromium wire generates heat through current and then utilizes the heating element on the outer side to dissipate the heat, the upper end of the straight heating element pipe is fixed on the container cover and is connected with a power supply, and the annular ring pipe below the straight pipe is a main heat dissipation part. The annular pipe is positioned at the lowest part in the container, and the liquid in the container adopts a heat transfer mode from bottom to top. The relevant parameters are used as follows:

working voltage: 220V;

rated power: less than or equal to 300 watts;

digital display thermometer: the temperature ranges from minus 50 ℃ to 250 ℃, and a red digital display thermometer is arranged;

a thermometer sensor probe: the diameter is 8mm, and the length is 120 mm;

a container: 500ml beaker.

Preparation before experiment

1. To ensure that the initial temperature of the water temperature and the initial temperature of the oil temperature are the same during the experiment, 300 g of water and oil are weighed in advance and put into two beakers.

2. The experimenter should fill in forms of the starting temperature, the quality and the water temperature per minute of water and oil on the blackboard in advance so as to fill in the experiments

Recording table

Liquid name

Initial temperature

1 minute

2 minutes

3 minutes

4 minutes

5 minutes

6 minutes

300 g of water

300 g edible oil

The method comprises the following operation steps:

1. the prepared two 300 g water and oil were poured into beakers, respectively, and thermometer sensor probes were inserted into the beakers and the depths of the two probes were adjusted to a uniform depth.

2. The heating element power cord was plugged into the power jack on the back side of the tester (care was taken to have to be taken to bottom out the socket to avoid making a bad contact) and then the power cord plug was plugged into the power terminal block.

3. The starting temperatures are filled in the table. Pressing a timer 'start' key timer to start timing and respectively recording the water and oil temperature values for 1 minute and the temperature values for 2 minutes.

4. It is found through experiments that the oil temperature increases almost 2 times faster than water when consuming the same power under the same mass and time, that is, the water temperature per mass increases 1 degree and needs 1 time more heat than oil. The specific heat capacity of water is stated to be greater than that of oil.

In the experiment, the safety precautions are as follows:

the instrument supplies power at 220V, 300 g of water can reach 100 ℃ after being heated for about 6 minutes, and the oil temperature can reach about 200 ℃, so that the operation of students is forbidden, and the scalding of the students is avoided.

And secondly, dry burning is forbidden, and a power supply is not required to be switched on when no liquid exists.

Pouring out the water and the oil after the experiment is finished, and wiping the water and the oil on the pipe wall for the next use.

Although the present invention has been described in detail, the present invention is not limited thereto, and those skilled in the art can modify the principle of the present invention, and therefore, various modifications performed according to the principle of the present invention should be understood as falling into the protection scope of the present invention.

Claims

1. A specific heat capacity demonstrator, comprising:

a support;

a housing mounted on the support;

a pair of fixing clips installed on the front panel of the casing;

a pair of containers for holding liquid, which are clamped on the pair of fixing clamps;

a pair of heating elements inserted on a pair of containers for heating the liquid in the corresponding containers;

a pair of temperature detecting elements inserted on the pair of containers for detecting the temperature of the liquid in the corresponding containers;

a pair of digital display thermometers which are correspondingly connected with the pair of temperature detection elements and are used for displaying corresponding temperatures;

and the power supply and control module is respectively and electrically connected with the pair of heating elements, the pair of temperature detection elements and the pair of digital display thermometers.

2. The specific heat capacity demonstrator of claim 1, wherein said heating element has an annular tube and the outer diameter of the annular tube is less than the inner diameter of the vessel.

3. The specific heat capacity demonstrator of claim 2, wherein said heating element has a straight tube perpendicularly connected to an annular tube.

4. The specific heat capacity demonstrator of claim 3, further comprising a container cover removably mounted at said container top opening, and wherein said container cover defines a first through-hole for passing said straight tube of said heating element therethrough.

5. The specific heat capacity demonstrator of claim 4, wherein said container cover is further provided with a second through hole for passing said temperature detecting element therethrough, and said second through hole is located at the center of said container cover.

6. The specific heat capacity demonstrator of claim 1, wherein said retaining clip is a ring clip removably mounted to said front panel.