Flame reaction experimental device easy and convenient to operate

Abstract

The utility model belongs to the technical field of experiment teaching aids, and particularly relates to a flame reaction experiment device which is simple and convenient to operate. The flame reaction experimental device easy and convenient to operate comprises a base, the base comprises a fixed base and a rotating platform arranged on the fixed base, a sample groove is formed in the axis position of the rotating platform, a plurality of transparent baffles are arranged around the sample groove, the lower ends of the transparent baffles are fixed to the rotating platform, and the lower ends of the transparent baffles are fixed to the rotating platform. A gap is formed between every two adjacent baffles. According to the utility model, a specific wind tunnel device design is adopted, flame tornado is formed by 100%, the experiment difficulty is reduced, and classroom experiment display of teachers is facilitated. By adopting the flame reaction experimental device, the ornamental value of the flame reaction is enhanced through the formation of the flame tornado, and the interestingness is beneficial to motivating the learning enthusiasm of students.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental teaching aids, and particularly relates to a flame test reaction experimental device with simple operation. Background Art

[0002] The "flame test reaction" experiment is an important teacher demonstration experiment in the high school stage of the chemistry subject, and this experiment is an important supplement to the method of identifying substances. Its principle is that when a metal or a compound is burned in a colorless flame, the internal electron energy level of the substance's atoms changes, and the energy is emitted in the form of light, causing the flame to present a special color reaction. Since the flame color of each element has its characteristic spectrum, it is often used to identify whether a certain metal exists in a compound.

[0003] Teachers usually adopt Figure 1 the method shown in the figure to demonstrate and teach the flame test reaction to students. Specifically as follows: For the flame test reaction, platinum wire (nickel wire, iron wire) is usually dipped and washed in dilute hydrochloric acid, and then burned in the flame of an alcohol lamp until the color of the flame is the same as the original one. Then, the metal wire is dipped into the solution to be tested and then placed on the flame. At this time, the characteristic flame color of the elements contained in the solution to be tested can be seen.

[0004] In the prior art, there are problems in the flame test reaction experiment that the experimental phenomenon is not obvious and the operation is cumbersome, and the expected teaching effect cannot be achieved. The reasons are as follows:

[0005] (1) The flame of the alcohol lamp itself is yellow, which will affect the observation result of the experimental phenomenon. It is very difficult for students to judge that the flame color of Na + is yellow, and the purple flame of K + is very difficult to be observed, and there will be color distortion on the blue cobalt glass.

[0006] (2) The platinum wire is too thin, and the amount of solution dipped during the experiment is extremely small. The time for generating the flame color is short, and the flame range is small. It is difficult for students to observe the phenomenon, and it is very difficult for the students at the back of the classroom to observe the reaction phenomenon.

[0007] (3) When conducting a classroom demonstration experiment, the time used for the experiment cannot be too long. During the experiment, the platinum wire needs to be repeatedly cleaned and burned, which consumes a lot of classroom time. Concentrated hydrochloric acid has high volatility, which will harm the physical and mental health of teachers and students, and at the same time causes air pollution, which does not conform to the green environmental protection concept of chemical experiments.

[0008] (4) The experiment has insufficient interestingness and is difficult to mobilize the enthusiasm of students in the classroom.

[0009] In the actual teaching process, teachers often do not demonstrate the flame color reaction experiment in class because the observable time of the flame color is short, the phenomenon is not obvious, and there are potential safety hazards. It is also difficult for students to experience the fun of the flame color reaction experiment from the descriptions in textbooks and the statements of teachers.

[0010] Therefore, it is particularly important to design a flame color reaction experiment device with simple operation, obvious reaction phenomena, strong interest, portability and safety for teachers' demonstration teaching, so as to vividly display the flame color experiment phenomena and improve the experimental teaching effect. Utility Model Content

[0011] Aiming at the problems existing in the flame color reaction experiment in the prior art, such as complex operation, short flame color reaction time, small flame range, unclear phenomenon, lack of interest, and difficulty in observing the purple flame of K + The purpose of the present utility model is to provide a flame color reaction experiment device with simple operation.

[0012] The implementation process of the present utility model is as follows:

[0013] A flame color reaction experiment device with simple operation, including a base, the base includes a fixed base and a rotating platform arranged on the fixed base, a sample groove is arranged at the axial center position of the rotating platform, and a number of transparent baffles are arranged around the sample groove. The lower ends of the transparent baffles are fixed on the rotating platform, and a gap is arranged between two adjacent transparent baffles.

[0014] Further, a bearing is embedded at the axial center position of the rotating platform, and the inner ring of the bearing is connected to the fixed base through a connecting rod. After the fixed base is fixed, the rotating platform can rotate.

[0015] Further, the material of the sample groove is ceramic, quartz or corundum.

[0016] Further, the number of the transparent baffles is at least two.

[0017] Further, a slot for inserting the transparent baffle is arranged on the rotating platform, and the lower end of the transparent baffle is inserted and fixed in the slot.

[0018] Further, the positions of a number of transparent baffles are centered on the sample groove.

[0019] Further, a number of transparent baffles are arranged in a staggered manner in sequence and surround the sample groove.

[0020] Further, the shape of the transparent baffle is any one of circular arc, L-shaped or straight plate.

[0021] Further, the material of the transparent baffle is glass or quartz.

[0022] Design Concept of the Present Utility Model

[0023] The utility model simulates the formation conditions of a flame tornado by designing a specific wind tunnel device, amplifies the flame height and combustion range to enhance the interestingness and ornamental value of the experiment; by using a sample tank as a container for holding a mixture of fuel (methanol or ethanol) and the substance to be tested (solid or salt solution), the duration of the flame color reaction is extended, and the flame range is amplified to observe the purple flame of K with the naked eye. + The purple flame of is limited within a specific space by a transparent baffle, which not only ensures the safety of the flame color reaction but also does not affect the observation of the flame color.

[0024] Positive effects of the utility model:

[0025] (1) The utility model can realize the integrated and portable design of the flame color reaction device, simplify the operation process of the teacher's demonstration experiment, and broaden the conditions for carrying out the demonstration experiment.

[0026] (2) The utility model adopts a specific wind tunnel device design, and the formation of the flame tornado is 100% achieved, reducing the experimental difficulty and being beneficial to the teacher's classroom experiment demonstration.

[0027] (3) In the utility model, the transparent baffle confines the flame within a specific space, which not only ensures the safety of the flame color reaction but also does not affect the observation of the flame color.

[0028] (4) By adopting the flame color reaction experimental device described in the utility model, the ornamental value and interestingness of the flame color reaction are enhanced through the formation of the flame tornado, which is conducive to stimulating students' learning enthusiasm.

[0029] (5) The flame color reaction experimental device described in the utility model has a simple structure, is convenient and easy to assemble, and is expected to transform the flame color reaction from a teaching demonstration experiment into a student experiment, stimulating students' interest in chemistry by allowing students to complete the entire experimental process by themselves. Description of the Drawings

[0030] Figure 1 is a schematic diagram of the process of the flame color reaction demonstration experiment in the prior art;

[0031] Figure 2 is a schematic structural diagram of the flame color reaction experimental device described in Embodiment 1;

[0032] Figure 3 is a top view schematic diagram of the flame color reaction experimental device described in Embodiment 1;

[0033] Figure 4 is a cross-sectional schematic diagram of the flame color reaction experimental device described in Embodiment 1;

[0034] Figure 5 is an arrangement schematic diagram of the transparent baffle of the flame color reaction experimental device described in Embodiment 2;

[0035] Figure 6 Schematic diagram of the arrangement of the transparent baffles of the flame color reaction experimental device described in Embodiment 3;

[0036] Among them, 1 is the base, 11 is the fixed base, 12 is the rotating platform, 2 is the sample tank, 3 is the transparent baffle, 4 is the gap, and 5 is the slot. Detailed implementation manners

[0037] The present utility model will be further described below in conjunction with embodiments.

[0038] It should be noted that in the flame color reaction experimental device of the present utility model, the sample tank 2 is used to hold fuel and the analyte. The fuel can be selected from methanol or ethanol, and the analyte can be a solid or a metal salt solution. The core of the design of the present utility model is the transparent baffles 3 arranged in a staggered manner on the rotating platform 12, which has two functions: the first is to facilitate the observation of the flame color; the second is to simulate the formation conditions of the flame tornado, ensuring that after the fuel in the sample tank 2 is ignited, the flame of the flame color reaction proceeds in the form of a flame tornado, making the color reaction more obvious.

[0039] The connection manner between the sample tank 2 on the rotating platform 12 and the rotating platform 12 can be an insertion connection, welding, gluing, or other connection manners that can achieve the fixing function during the experiment.

[0040] Embodiment 1

[0041] A flame color reaction experimental device with simple operation, as shown in Figure 2-4 shown, includes a base 1, the base 1 includes a fixed base 11 and a rotating platform 12 arranged on the fixed base 11. A bearing is embedded at the axial center position of the rotating platform 12, and the inner ring of the bearing is fixedly connected to the fixed base 11 through a connecting rod. After the fixed base 11 is fixed, the rotating platform 12 can rotate. A sample tank 2 is arranged at the axial center position of the rotating platform 12, and the material of the sample tank is ceramic. Taking the sample tank 2 as the center, two transparent baffles 3 are arranged in a staggered manner around the sample tank 2. A slot 5 for inserting the transparent baffle 3 is arranged on the rotating platform 12, and the lower end of the transparent baffle 3 is inserted and fixed in the slot 5. A gap 4 is arranged between two adjacent transparent baffles 3. The shape of the transparent baffle 3 is arc-shaped. The material of the transparent baffle 3 is glass.

[0042] Embodiment 2

[0043] A flame color reaction experimental device with simple operation, including a base 1. The base 1 includes a fixed base 11 and a rotating platform 12 arranged on the fixed base 11. A bearing is embedded at the axial center position of the rotating platform 12, and the inner ring of the bearing is connected to the fixed base 11 through a connecting rod. After the fixed base 11 is fixed, the rotating platform 12 can rotate. A sample groove 2 is arranged at the axial center position of the rotating platform 12, and the material of the sample groove is corundum. Centered on the sample groove 2, two transparent baffles 3 are sequentially arranged in a staggered manner around the sample groove 2. The arrangement schematic diagram of the two transparent baffles 3 is shown in Figure 5 . A slot 5 for inserting the transparent baffle 3 is arranged on the rotating platform 12, and the lower end of the transparent baffle 3 is inserted and fixed in the slot 5. A gap 4 is arranged between two adjacent transparent baffles 3. The shape of the transparent baffle 3 is L-shaped. The material of the transparent baffle 3 is quartz.

[0044] Example 3

[0045] A flame color reaction experimental device with simple operation, including a base 1. The base 1 includes a fixed base 11 and a rotating platform 12 arranged on the fixed base 11. A bearing is embedded at the axial center position of the rotating platform 12, and the inner ring of the bearing is connected to the fixed base 11 through a connecting rod. After the fixed base 11 is fixed, the rotating platform 12 can rotate. A sample groove 2 is arranged at the axial center position of the rotating platform 12, and the material of the sample groove is quartz. Centered on the sample groove 2, six transparent baffles 3 are sequentially arranged in a staggered manner around the sample groove 2. The arrangement schematic diagram of the six transparent baffles 3 is shown in Figure 6 . A slot 5 for inserting the transparent baffle 3 is arranged on the rotating platform 12, and the lower end of the transparent baffle 3 is inserted and fixed in the slot 5. A gap 4 is arranged between two adjacent transparent baffles 3. The shape of the transparent baffle 3 is a straight plate. The material of the transparent baffle 3 is quartz.

[0046] The operation method when using the flame color reaction experimental device of the present utility model to conduct a flame color reaction demonstration experiment:

[0047] (1) Clean and dry the sample groove 2 on the rotating platform 12, place an appropriate amount of fuel (such as methanol or ethanol) in the sample groove 2, and then put the analyte (such as metal salt solution or solid) into the sample groove 2 and mix evenly with the fuel.

[0048] (2) Light the fuel in the sample groove 2 with a match, and then insert and fix the lower end of the transparent baffle 3 in the slot 5 on the rotating platform 12.

[0049] (3) Observe the flame shape, slowly rotate the rotating platform 12 until a flame tornado is formed, and then stop rotating the rotating platform 12.

[0050] (4) Observe the flame colors of different substances by replacing the analyte in the sample cell 2; prolong the duration of the flame tornado by increasing the amount of fuel in the sample cell 2.

[0051] During the flame color reaction experiment using the flame color reaction experiment device of the present utility model, it is prohibited to inject fuel into the sample cell 2. The analyte can be dropped or sprinkled from above the flame in small amounts and multiple times to enhance the flame color. It is strictly prohibited to inject fuel exceeding the safe amount into the sample cell 2. In addition, the rotation platform 12 should be rotated slowly.

[0052] The working principle of the flame color reaction experiment device of the present utility model:

[0053] Airflow will rush into the gaps of the transparent baffle 3, and the flame in the sample cell 2 provides heat. Due to the combination of strong heat and surging airflow, a rotating air vortex is formed. The air vortex is tightened, causing the flame height to continuously increase, and finally a flame tornado is formed. Due to the surging airflow during the formation of the flame tornado, the analyte mixed in the fuel is continuously entrained and evenly distributed in the flame burning range, and the electrons inside the analyte atoms absorb the flame energy, resulting in a change in energy level and finally the energy is emitted in the form of light. The characteristic color will fill the entire flame tornado, presenting a flame color reaction with a characteristic color. Due to sufficient fuel and the formation of the flame tornado, the flame color is more obvious at this time and the duration is long.

[0054] Experimental effect verification:

[0055] (I) Experimental preparation; the flame color reaction experiment device of the present utility model, absolute ethanol, potassium chloride solution, match.

[0056] (II) Experimental operation: During the experiment, the effects of different shapes of transparent baffles, the height of the transparent baffles, and the spacing between adjacent transparent baffles on the flame height were tested.

[0057] (III) Results and discussion:

[0058] Verification 1: The influence of different shapes of transparent baffles on the formation of the flame tornado

[0059] When performing a flame color reaction using an L-shaped transparent baffle, the width of the L-shaped transparent baffle is 6 cm, and the height of the L-shaped transparent baffle is 19.5 cm;

[0060] When performing a flame color reaction using triangular transparent baffles connected edge to edge without gaps, the width of each face of the triangular transparent baffle is 6 cm, and the height of the triangular transparent baffle is 19.5 cm;

[0061] When using two L-shaped transparent baffles to be arranged around the sample slot with a misalignment to leave a gap for performing a flame color reaction, the width of the two L-shaped transparent baffles is 6 cm, the height of the L-shaped transparent baffle is 19.5 cm; the gap is 1 cm;

[0062] When using two arc-shaped transparent baffles to be arranged around the sample slot with a misalignment to leave a gap for performing a flame color reaction, the width of the two arc-shaped transparent baffles is 6 cm, the height of the arc-shaped transparent baffle is 19.5 cm; the gap is 1 cm;

[0063] Comparative experiment: Operate according to the existing technology and Figure 1 the method shown.

[0064] Through experiments, it is concluded that when two arc-shaped transparent baffles or two L-shaped transparent baffles are arranged around the sample slot with a misalignment to leave a gap for performing a flame color reaction, the effect is the best, the flame color is more obvious and the duration is longer than that of the existing technology, and it is easier to observe. When using one L-shaped transparent baffle for the flame color reaction, since the flame is not restricted in the baffle area and no air vortex is formed, the flame is lower; when using triangular transparent baffles with edges connected and no gap for the flame color reaction, since no more air flow enters, the flame is lower.

[0065] Verification 2: Influence of the spacing between adjacent L-shaped transparent baffles on the formation of a flame tornado

[0066] When using two L-shaped transparent baffles to be arranged around the sample slot with a misalignment to leave a gap for performing a flame color reaction, the width of the two L-shaped transparent baffles is 6 cm, the height of the L-shaped transparent baffle is 19.5 cm; the gaps are 0.5 cm, 1 cm, and 2 cm respectively.

[0067] Through experiments, it is concluded that when the gap is 1 cm, the flame is the highest and the effect is the best. In addition, the flame will also increase without rotating the rotating platform, or the flame will also increase when fanning the flame with a fan.

[0068] Verification 3: Influence of the height of the L-shaped transparent baffle on the formation of a flame tornado

[0069] When using two L-shaped transparent baffles to be arranged around the sample slot with a misalignment to leave a gap for performing a flame color reaction, the width of the two L-shaped transparent baffles is 6 cm, the heights of the L-shaped transparent baffles are 20 cm, 18.5 cm, 17.5 cm, and 14.5 cm respectively; the gap is 1 cm.

[0070] Through experiments, it is concluded that when the height is 18.5 cm, the flame is the highest and the effect is the best.

[0071] In summary, the height of the transparent baffle is preferably 18.5 cm, the gap is preferably 1 cm, the width of the transparent baffle is preferably 7.25 cm, and the experimental effect of the flame tornado is good. In addition, the effect of fanning the air with a fan is significantly inferior to rotating the rotating platform.

[0072] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is limited to these descriptions. For those of ordinary skill in the field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope of the present utility model.

Claims

1. A flame color reaction experimental device that is easy to operate, characterized in that: The invention comprises a base (1), wherein the base (1) comprises a fixed base (11) and a rotating platform (12) arranged on the fixed base (11), a sample slot (2) is arranged at the axis position of the rotating platform (12), a plurality of transparent baffles (3) are arranged around the sample slot (2), the lower ends of the transparent baffles (3) are fixed on the rotating platform (12), and a gap (4) is arranged between two adjacent transparent baffles (3).

2. The flame color reaction experimental device according to claim 1, characterized in that: A bearing is embedded in the axis center of the rotating platform (12), and the inner ring of the bearing is connected to the fixed base (11) via a connecting rod. After the fixed base (11) is fixed, the rotating platform (12) can rotate.

3. The flame color reaction experimental device according to claim 1, characterized in that: The sample tank is made of ceramic, quartz or corundum.

4. The flame color reaction experimental device according to claim 1, characterized in that: The number of the transparent baffles (3) is at least two.

5. The flame color reaction experimental device according to claim 1, characterized in that: The rotating platform (12) is provided with a slot (5) for inserting the transparent baffle (3), and the lower end of the transparent baffle (3) is inserted and fixed in the slot (5).

6. The flame color reaction experimental device according to claim 1, characterized in that: The positions of the plurality of transparent baffles (3) are arranged with the sample slot (2) as the center.

7. The flame color reaction experimental device according to claim 1, characterized in that: A plurality of transparent baffles (3) are arranged in a staggered manner in sequence and surround the sample tank (2).

8. The flame color reaction experimental device according to claim 1, characterized in that: The transparent baffle (3) is in any one of an arc shape, an L shape or a straight plate shape.

9. The flame color reaction experimental device according to claim 1, characterized in that: The material of the transparent baffle (3) is glass or quartz.

Images