Miniature environment-friendly teaching device for chemical gas production and property inspection

Abstract

The utility model discloses a miniature environment-friendly teaching device for chemical gas production and property inspection, which comprises a vacuum blood collection tube, a vein blood collection needle, a medical three-way valve, a first injector, a second injector, a third injector and a standby injector, the vacuum blood collection tube consists of a tube body and a rubber plug, and an opening is arranged at the top of the tube body. When the chemical experiment device is used for carrying out a conventional gas-placing chemical experiment, the vacuum blood collection tube is used as a reaction device, the vein blood collection needle is used for conveying gas, related property experiments are carried out in the first injector and the second injector through connection and conversion of the medical three-way valve, and the spiral connector of the vein blood collection needle is perfectly matched with the medical three-way valve; good air tightness is guaranteed, required instruments are miniature, simple and environment-friendly, the reagent dosage is small, the experiment phenomenon is obvious, an airflow channel can be controlled, the process is simple, the effect is high, and when experiments of toxic gas preparation and property inspection are conducted, safety is high, and students can conduct manual operation by themselves.

Description

Technical Field

[0001] The utility model relates to the field of chemical experiment teaching aids, in particular to a miniature environmentally friendly chemical gas production and property testing teaching device. Background Art

[0002] At present, chemical experiments are necessary operations in college chemistry courses. Chemical experiments can help students better understand various chemical substances and reaction effects, so that students can understand and remember various chemical substances and their reactions, and learn chemistry courses better. Therefore, in order to ensure the safety of students during chemical experiments, chemical experiments usually have specially set up laboratory classrooms. Chemical gas production experiments are set up in college chemistry laboratory classrooms, such as; the preparation and property inspection of sulfur dioxide, the preparation and property inspection of ethylene, the preparation of nitrogen dioxide, and the exploration of the effects of pressure and temperature on chemical equilibrium.

[0003] Conventional chemical experiments conducted in the above laboratories require cumbersome instruments, waste reagents, and are complex processes with low results. The preparation and property testing of toxic gases are often demonstrated by teachers due to safety issues, and students are not allowed to do it themselves.

[0004] Therefore, it is necessary to design a miniature environmentally friendly chemical gas production and property testing teaching device to solve the above-mentioned problems. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a miniature environmentally friendly chemical gas production and property testing teaching device.

[0006] The utility model is realized through the following technical solutions:

[0007] A miniature environmentally friendly chemical gas production and property testing teaching device comprises a vacuum blood collection tube, a venous blood collection needle, a medical three-way valve, a first syringe, a second syringe, a third syringe and a spare syringe, wherein the vacuum blood collection tube is composed of a tube body and a rubber stopper, the top of the tube body is provided with an opening, the rubber stopper is sealingly inserted into the tube body opening, the medical three-way valve is provided with three sockets, the vacuum blood collection tube is connected to one of the sockets of the medical three-way valve through the venous blood collection needle, the needle nozzles of the first syringe and the second syringe are respectively inserted into the other two sockets of the three-way valve and are connected thereto, the first syringe, the second syringe and the venous blood collection needle can be connected to each other through the medical three-way valve, a first needle is plugged into the port of the third syringe, the first needle penetrates the rubber stopper and extends into the tube body to be connected thereto.

[0008] Preferably, the venous blood collection needle consists of a connecting hose, a second needle and a spiral connector. The second needle is fixedly connected to one end of the connecting hose, and the spiral connector is fixedly connected to the other end of the connecting hose. The spiral connector of the venous blood collection needle is inserted into one of the sockets of the medical three-way valve and connected thereto. The spiral connector and the socket of the medical three-way valve fit perfectly with each other and are matched with each other. The second needle penetrates the rubber stopper and extends into the tube body to connect thereto.

[0009] Preferably, the spare syringe has the same size as the first syringe and the second syringe, and is used to replace the first syringe and the second syringe. The needle mouth of the spare syringe can be inserted into the socket of the medical three-way valve and communicated with it.

[0010] Preferably, the spare syringe, the first syringe and the second syringe are all syringes with a capacity of 60-150 ml.

[0011] Preferably, the vacuum blood collection tube is a vacuum blood collection tube with a capacity of 5-10 ml.

[0012] Compared with the existing technology, the beneficial effects of the utility model are:

[0013] When doing conventional gas-setting chemical experiments with this chemical experiment device, the vacuum blood collection tube is used as the reaction device, the venous blood collection needle is used to transport the gas, and the relevant property experiments are carried out in the first syringe and the second syringe through the connection and conversion of the medical three-way valve. The spiral connector of the venous blood collection needle and the medical three-way valve fit perfectly, ensuring good airtightness. The required instruments are miniature, simple and environmentally friendly, and the reagent consumption is small. The experimental phenomena are obvious and the airflow channel can be controlled. The process is simple and the effect is high. When doing experiments on the preparation and property inspection of toxic gases, it is safe and students can do it by themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] In the figure: a vacuum blood collection tube 1, a tube body 1-1, a rubber stopper 1-2, a venous blood collection needle 2, a connecting hose 2-1, a second needle 2-2, a spiral connector 2-3, a medical three-way valve 3, a first syringe 4, a second syringe 5, a third syringe 6, a first needle 7, and a spare syringe 8. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0017] like Figure 1As shown, a miniature environmentally friendly chemical gas production and property inspection teaching device comprises a vacuum blood collection tube 1, a venous blood collection needle 2, a medical three-way valve 3, a first syringe 4, a second syringe 5, a third syringe 6 and a spare syringe 8. The vacuum blood collection tube 1 is composed of a tube body 1-1 and a rubber stopper 1-2. The top of the tube body 1-1 is provided with an opening, and the rubber stopper 1-2 is sealed and inserted into the opening of the tube body 1-1. The medical three-way valve 3 is provided with three sockets. The vacuum blood collection tube 1 is connected to one of the sockets of the medical three-way valve 3 through the venous blood collection needle 2. The needle nozzles of the first syringe 4 and the second syringe 5 are respectively inserted into the other two sockets of the three-way valve 3 and are connected thereto. The first syringe 4, the second syringe 5 and the venous blood collection needle 2 can be connected to each other through the medical three-way valve 3. A first needle 7 is plugged into the port of the third syringe 6. The first needle 7 penetrates the rubber stopper 1-2 and extends into the tube body 1-1 to be connected thereto.

[0018] The venous blood collection needle 2 is composed of a connecting hose 2-1, a second needle 2-2 and a spiral connector 2-3. The second needle 2-2 is fixedly connected to one end of the connecting hose 2-1, and the spiral connector 2-3 is fixedly connected to the other end of the connecting hose 2-1. The spiral connector 2-3 of the venous blood collection needle 2 is inserted into one of the sockets of the medical three-way valve 3 and connected thereto. The spiral connector 2-3 and the socket of the medical three-way valve 3 are perfectly matched and matched with each other. The second needle 2-2 penetrates the rubber stopper 1-2 and extends into the tube body 1-1 to be connected thereto.

[0019] The spare syringe 8 has the same size as the first syringe 4 and the second syringe 5 , and is used to replace the first syringe 4 and the second syringe 5 . The needle mouth of the spare syringe 8 can be inserted into the socket of the medical three-way valve 3 and communicated with it.

[0020] The spare syringe 8, the first syringe 4 and the second syringe 5 are all syringes with a capacity of 60-150 ml.

[0021] The vacuum blood collection tube 1 is a vacuum blood collection tube with a capacity of 5-10 ml.

[0022] Working principle:

[0023] The teaching device is used to perform an experiment on the preparation and property inspection of sulfur dioxide. The experimental process is as follows: first, unscrew the rubber stopper 1-2, put anhydrous sodium sulfite into the tube body 1-1, and then cover the rubber stopper 1-2. Then, acidic KMnO4 and Na2S solutions are sucked into the first syringe 4 and the second syringe 5 respectively. Then, the first syringe 4 and the second syringe 5 are plugged into the medical three-way valve 3. Then, the medical three-way valve 3 is connected to the vacuum blood collection tube 1 through the venous blood collection needle 2, and 70% sulfuric acid is sucked into the third syringe 6, and the 70% sulfuric acid sucked into the third syringe 6 is injected into the vacuum blood collection tube 1. At this time, the sulfuric acid and anhydrous sodium sulfite in the vacuum blood collection tube 1 react to produce sulfur dioxide gas. At this time, the sulfur dioxide gas produced in the vacuum blood collection tube 1 enters the medical three-way valve 3 through the venous blood collection needle 2, and then enters the first syringe 4 and the second syringe 5 containing acidic KMnO4 and Na2S solutions respectively through the medical three-way valve 3, so that the KMnO4 solution fades and the Na2S solution becomes turbid. This chemical phenomenon can be clearly observed through the transparent first syringe 4 and the second syringe 5. Based on this, the third syringe 6 containing the fuchsin solution is replaced. After a period of time, it can be observed that the fuchsin solution gradually fades. So far, the experiment of preparing sulfur dioxide and testing its properties has been completed through this teaching device.

[0024] The teaching device can also be used to conduct experiments on the preparation and property inspection of ethylene. The experimental process is as follows: first, unscrew the rubber stopper 1-2, put solid sodium hydroxide into the tube body 1-1, and then cover the rubber stopper 1-2. Then, acidic KMnO4 and bromine aqueous solution are sucked into the first syringe 4 and the second syringe 5 respectively. Then, the first syringe 4 and the second syringe 5 are plugged into the medical three-way valve 3. Then, the medical three-way valve 3 is connected to the vacuum blood collection tube 1 through the venous blood collection needle 2. 40% ethephon is sucked into the third syringe 6, and the 40% ethephon sucked into the third syringe 6 is sucked into the third syringe 6. % ethephon is injected into the vacuum blood collection tube 1, at which time the ethephon and sodium hydroxide in the vacuum blood collection tube 1 react to produce ethylene gas. At this time, the ethylene gas produced in the vacuum blood collection tube 1 enters the medical three-way valve 3 through the venous blood collection needle 2, and then enters the first syringe 4 and the second syringe 5 containing acidic KMnO4 and bromine water respectively through the medical three-way valve 3, so that both KMnO4 and bromine water fade. This chemical phenomenon can be clearly observed through the transparent first syringe 4 and the second syringe 5. At this point, the experiment of preparing and testing the properties of ethylene has been completed through this teaching device.

[0025] The teaching device can also be used to prepare nitrogen dioxide and to explore the effects of pressure and temperature on chemical equilibrium. The experimental process is as follows: first, unscrew the rubber stopper 1-2, put a copper sheet into the tube body 1-1, and then cover the rubber stopper 1-2. Then, plug the first syringe 4 and the second syringe 5 into the medical three-way valve 3. Then, connect the medical three-way valve 3 with the vacuum blood collection tube 1 through the venous blood collection needle 2, and inhale concentrated nitric acid into the third syringe 6. The concentrated nitric acid inhaled into the third syringe 6 is injected into the vacuum blood collection tube 1 containing the copper sheet. At this time, the concentrated nitric acid and the copper sheet in the vacuum blood collection tube 1 react to produce a brown-red gas NO2 gas. The NO2 gas produced in the vacuum blood collection tube 1 enters the medical three-way valve 3 through the venous blood collection needle 2, and then enters the first syringe 4 and the second syringe 5 respectively through the medical three-way valve 3. At this time, arbitrarily close the valves of the first syringe 4 and the second syringe 5 leading to the three-way valve 3, hold the medical three-way valve 3 with one hand, and push the syringe with the other hand, so that the NO2 gas in the syringe is pressurized, thereby moving the chemical equilibrium in the reverse reaction direction. Then wrap the first syringe 4 and the second syringe 5 with a cold towel and a hot towel respectively for a period of time. Then it can be observed that the chemical equilibrium in the first syringe 4 wrapped with the cold towel moves in the forward reaction direction, while the chemical equilibrium in the second syringe 5 wrapped with the hot towel moves in the reverse reaction direction. At this point, the preparation of nitrogen dioxide and the experiment of exploring the influence of pressure and temperature on chemical equilibrium have been completed through this teaching device.

[0026] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A miniature environmentally friendly chemical gas production and property testing teaching device, comprising a vacuum blood collection tube (1), a venous blood collection needle (2), a medical three-way valve (3), a first syringe (4), a second syringe (5), a third syringe (6) and a spare syringe (8), characterized in that; The vacuum blood collection tube (1) is composed of a tube body (1-1) and a rubber stopper (1-2). The top of the tube body (1-1) is provided with an opening, and the rubber stopper (1-2) is sealed and inserted into the opening of the tube body (1-1). The medical three-way valve (3) is provided with three sockets. The vacuum blood collection tube (1) is connected to one of the sockets of the medical three-way valve (3) through a venous blood collection needle (2). The needle nozzles of the first syringe (4) and the second syringe (5) are respectively inserted into the other two sockets of the three-way valve (3) and are connected thereto. The first syringe (4), the second syringe (5) and the venous blood collection needle (2) can be connected to each other through the medical three-way valve (3). The port of the third syringe (6) is plugged with a first needle (7), and the first needle (7) penetrates the rubber stopper (1-2) and extends into the tube body (1-1) to be connected thereto.

2. A miniature environmentally friendly chemical gas production and property testing teaching device according to claim 1, characterized in that: The venous blood collection needle (2) is composed of a connecting hose (2-1), a second needle (2-2) and a spiral connector (2-3); the second needle (2-2) is fixedly connected to one end of the connecting hose (2-1), and the spiral connector (2-3) is fixedly connected to the other end of the connecting hose (2-1); the spiral connector (2-3) of the venous blood collection needle (2) is inserted into one of the sockets of the medical three-way valve (3) and is connected thereto; the spiral connector (2-3) and the socket of the medical three-way valve (3) are perfectly matched and arranged to match each other; the second needle (2-2) penetrates the rubber stopper (1-2) and extends into the tube body (1-1) to be connected thereto.

3. A miniature environmentally friendly chemical gas production and property testing teaching device according to claim 1, characterized in that: The spare syringe (8) has the same size as the first syringe (4) and the second syringe (5). The spare syringe (8) is used to replace the first syringe (4) and the second syringe (5). The needle mouth of the spare syringe (8) can be inserted into the socket of the medical three-way valve (3) and communicated with it.

4. A miniature environmentally friendly chemical gas production and property testing teaching device according to claim 1, characterized in that: The spare syringe (8), the first syringe (4) and the second syringe (5) are all syringes with a capacity of 60-150 ml.

5. A miniature environmentally friendly chemical gas production and property testing teaching device according to claim 1, characterized in that: The vacuum blood collection tube (1) has a capacity of 5-10 ml.

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