Gas pressure demonstration instrument

Abstract

The utility model belongs to the technical field of experimental devices, and particularly relates to a gas pressure demonstration instrument, which comprises a power supply, a plastic cover, a motor, a turbine disc, a plastic ball and a pressure sensor, and is characterized in that the power supply is connected with the motor through a lead; a shell is arranged on the periphery of the motor, and the bottom of the plastic cover is fixed to the top of the shell. An output shaft of the motor is fixed to the turbine disc, and the outer wall of the turbine disc is in clearance fit with the inner wall of the plastic cover. The pressure sensor is fixed at the top of the inner wall of the plastic cover; a plastic ball is arranged between the turbine disc and the pressure sensor; the pressure sensor is electrically connected with an external display screen, the turbine disc is used for blowing the plastic ball, the movement of the plastic ball is used for simulating the change of gas, the pressure sensor is used for recording the gas pressure, and the abstract gas pressure intensity is converted into a visual phenomenon.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental devices, in particular to a gas pressure demonstrator. Background Art

[0002] In quality education, chemical experiments play a very important role. Among them, experiments are intuitive, in line with the cognitive characteristics of middle school students, easy to attract students, and very strict requirements for students, which makes it easier to cultivate students' rigorous scientific attitude.

[0003] In actual teaching, since gas pressure cannot be observed directly, it is more abstract to understand and more difficult to learn. The school laboratory does not have experimental equipment on the relationship between gas pressure and flow rate, which results in most students being unable to understand the knowledge point of the relationship between gas pressure and flow rate. Utility Model Content

[0004] In view of the problems existing in the background technology, the utility model provides a gas pressure demonstrator, which uses a turbine disk to blow a plastic ball, uses the movement of the plastic ball to simulate the change of gas, and uses a pressure sensor to record the air pressure, thereby converting the abstract gas pressure into an intuitive and visual phenomenon.

[0005] The technical solution of the utility model is as follows:

[0006] A gas pressure demonstrator comprises a power supply, a plastic cover, a motor, a turbine disc, a plastic ball and a pressure sensor, wherein the power supply is connected to the motor via a wire; a shell is arranged on the periphery of the motor, and the bottom of the plastic cover is fixed to the top of the shell; the output shaft of the motor is fixed to the turbine disc, and the outer wall of the turbine disc and the inner wall of the plastic cover are gap-matched; the pressure sensor is fixed to the top of the inner wall of the plastic cover; a plastic ball is arranged between the turbine disc and the pressure sensor; and the pressure sensor is electrically connected to an external display screen.

[0007] Furthermore, the plastic cover is made of transparent material.

[0008] Furthermore, the motor is a variable speed motor.

[0009] Furthermore, a partition plate is provided at the bottom of the turbine disc, the partition plate is fixed to the inner wall of the plastic cover, the partition plate is rotationally connected to the output shaft of the motor, and the partition plate is gap-matched with the turbine disc.

[0010] The utility model has the following beneficial effects:

[0011] 1. The utility model uses a turbine disk to blow a plastic ball, uses the movement of the plastic ball to simulate the change of gas, and uses a pressure sensor to record the air pressure, thereby transforming the abstract gas pressure into an intuitive and visual phenomenon.

[0012] 2. When the turbine disk of the utility model rotates, the plastic balls can fully make irregular collisions in the plastic cover, thereby simulating the irregular movement of gas molecules.

[0013] 3. The utility model detects the magnitude of the force generated by the frequent impact of the plastic ball through a pressure sensor, and uses a display screen to display the detected data, which can intuitively reflect the cause and magnitude of the pressure generated by the gas.

[0014] 4. The utility model can adjust the speed of the motor and the height of the pressure sensor. By adjusting the speed of the motor or adjusting the height of the pressure sensor, respectively observing and recording the readings of the pressure sensor, the relationship between the volume and pressure of a certain mass of gas can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] The reference numerals in the figure are as follows:

[0017] 1. Power supply; 2. Outer shell; 3. Plastic cover; 4. Motor; 5. Turbine disk; 6. Plastic ball; 7. Partition plate; 8. Pressure sensor; 9. Display screen; 10. Wire. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, the gas pressure demonstrator of this embodiment includes a power supply 1, a plastic cover 3, a motor 4, a turbine disk 5, a plastic ball 6 and a sensor 8. The power supply 1 is connected to the motor 4 through a wire 10; a shell 2 is arranged on the periphery of the motor 4, and the bottom of the plastic cover 3 is fixed to the top of the shell 2; the output shaft of the motor 4 is fixed to the turbine disk 5, and the outer wall of the turbine disk 5 and the inner wall of the plastic cover 3 are gap-matched; the sensor 8 is fixed to the top of the inner wall of the plastic cover 3; a plastic ball 6 is arranged between the turbine disk 5 and the sensor 8; the sensor 8 is electrically connected to the external display screen 9.

[0020] When the turbine disk 5 of the utility model rotates, the plastic balls 6 can make full irregular collisions in the plastic cover 3, thereby simulating the irregular movement of gas molecules. The pressure sensor 8 detects the magnitude of the force generated by the frequent collisions of the plastic balls 6, and the display screen 9 displays the detected data, which can intuitively reflect the cause and magnitude of the pressure generated by the gas.

[0021] Furthermore, the plastic cover 3 is made of transparent material.

[0022] The transparent plastic cover 3 makes it easier for the experimenter to observe the movement of the plastic ball 6 inside.

[0023] Furthermore, the motor 4 is a variable speed motor.

[0024] The utility model can adjust the speed of the motor 4 and the height of the pressure sensor 8. By adjusting the speed of the motor 4 or adjusting the height of the pressure sensor 8, respectively observing and recording the readings of the pressure sensor 8, the relationship between the volume and pressure of a certain mass of gas can be obtained.

[0025] Furthermore, a partition plate 7 is provided at the bottom of the turbine disc 5 , the partition plate 7 is fixed to the inner wall of the plastic cover 3 , the partition plate 7 is rotationally connected to the output shaft of the motor 4 , and the partition plate 7 and the turbine disc 5 are clearance-matched.

[0026] The working principle of the utility model is as follows:

[0027] 1. Put the plastic ball 6 into the plastic cover 3.

[0028] 2. Place the pressure sensor 8 flatly in the plastic cover 3 and use the power supply 1 to connect the motor 4 and the display screen 9.

[0029] 3. Lower the pressure sensor 8 to a lower position, start the motor 4, and observe the reading displayed on the display screen 9.

[0030] 4. When the rotation speed of the motor 4 is increased, it can be observed that the plastic ball 6 moves more violently and the reading of the pressure sensor 8 becomes larger.

[0031] From the above, it can be concluded that when the volume of the container remains unchanged, the greater the rotation speed of the motor 4, the more violent the movement of the plastic ball 6, and the greater the pressure on the plastic cover 3. That is, the reaction gas pressure is related to the intensity of the gas molecular movement. The more violent the molecular movement, the greater the gas pressure.

[0032] 5. The speed of motor 4 remains unchanged. Move pressure sensor 8 upward and it can be observed that the reading of pressure sensor 8 decreases.

[0033] From the above, it can be concluded that: when the speed of motor 4 remains unchanged, the larger the container volume, the smaller the gas pressure. The reaction gas pressure is related to the number of gas molecules per unit volume. The larger the container volume, the fewer molecules per unit volume, the fewer times they hit the wall, and the smaller the gas pressure.

[0034] The above experiments show that the pressure of gas is related to the intensity of the movement of gas molecules and the number of gas molecules per unit volume. In fact, the intensity of molecular movement is related to temperature. As the temperature rises, the average kinetic energy of molecules is greater, and the impact force on the wall is greater. Therefore, the higher the temperature, the more molecules per unit volume, and the greater the pressure of gas.

[0035] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gas pressure demonstrator, characterized in that: The invention comprises a power source (1), a plastic cover (3), a motor (4), a turbine disc (5), a plastic ball (6) and a pressure sensor (8), wherein the power source (1) is connected to the motor (4) via a wire (10); a housing (2) is arranged on the outer periphery of the motor (4), and the bottom of the plastic cover (3) is fixed to the top of the housing (2); the output shaft of the motor (4) is fixed to the turbine disc (5), and the outer wall of the turbine disc (5) is gap-matched with the inner wall of the plastic cover (3); the pressure sensor (8) is fixed to the top of the inner wall of the plastic cover (3); a plastic ball (6) is arranged between the turbine disc (5) and the pressure sensor (8); and the pressure sensor (8) is electrically connected to an external display screen (9).

2. A gas pressure demonstrator according to claim 1, characterized in that: The plastic cover (3) is made of transparent material.

3. A gas pressure demonstrator according to claim 1, characterized in that: The motor (4) is a variable speed motor.

4. A gas pressure demonstrator according to claim 1, characterized in that: A partition plate (7) is provided at the bottom of the turbine disc (5), the partition plate (7) is fixed to the inner wall of the plastic cover (3), the partition plate (7) is rotatably connected to the output shaft of the motor (4), and the partition plate (7) and the turbine disc (5) are clearance-matched.

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