Eddy current demonstration teaching aid suitable for teaching

Abstract

The utility model relates to the technical field of eddy current teaching, and discloses an eddy current demonstration teaching aid suitable for teaching, which comprises an eddy current generator, the eddy current generator comprises a first shell and a second shell, the first shell is a transparent shell, the second shell is a non-transparent shell, one end of the eddy current generator is connected with an eddy current adjusting mechanism, and the other end of the eddy current generator is connected with a teaching aid. A venturi tube is connected to the other end of the gas inlet pipe, and a low-temperature gas control mechanism is arranged at the end part of the venturi tube. The device has the effects that the low-temperature gas is secondarily utilized, and internal elements of the compression control manufacturing equipment can be cooled.

Description

Technical Field

[0001] This utility model relates to the field of eddy current teaching technology, and in particular to an eddy current demonstration teaching aid suitable for teaching. Background Technology

[0002] A vortex tube, also known as a vortex sheath, is a simple thermodynamic device based on the principle of vortex flow. Through its unique internal structure, it can separate compressed air or other gases into hot and cold parts, achieving either cooling or heating. Invented in the early 20th century, the vortex tube is unique in that it requires no moving parts, thus eliminating wear and tear, resulting in maintenance-free operation and a long lifespan. Furthermore, vortex tubes do not involve any chemical reactions during operation, ensuring high safety and making them particularly suitable for applications requiring precise environmental control.

[0003] Current eddy current teaching equipment typically only demonstrates the flow path and temperature gradient changes of compressed air, after which the compressed air is naturally discharged, failing to enable secondary utilization of the compressed air. Utility Model Content

[0004] The purpose of this invention is to provide a teaching aid for eddy current demonstrations that can reuse compressed air after eddy current teaching demonstrations, thereby improving energy efficiency.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: a teaching aid for eddy current demonstration, including an eddy current generator, the eddy current generator including a first shell and a second shell, the first shell being a transparent shell and the second shell being an opaque shell, one end of the eddy current generator being connected to an eddy current adjustment mechanism, and the other end being connected to a Venturi tube, the end of the Venturi tube being provided with a low-temperature gas control mechanism.

[0006] Furthermore, the eddy current generator has a hot flow tube at one end and a cold flow tube at the other end. The eddy current generator has an eddy current generating chamber in the middle. The hot flow tube, the eddy current generating chamber, and the cold flow tube are connected in sequence. The outer wall of the eddy current generating chamber has a compressed air inlet. The eddy current regulating mechanism is detachably installed at the end of the hot flow tube. The inner wall of the second outer shell corresponding to the hot flow tube is provided with a first reversible thermosensitive coating. A hollow tube is provided axially at the center of the hot flow tube. The outer wall of the hollow tube is provided with a second reversible thermosensitive coating.

[0007] Furthermore, one end of the cold flow tube extends into the vortex generating chamber and is connected to the compressed air inlet, while the other end is connected to the Venturi tube. The inner wall of the second outer shell corresponding to the cold flow tube is provided with a second reversible thermosensitive coating.

[0008] Furthermore, a fixing component is provided between the hollow tube and the hot flow tube.

[0009] Furthermore, the inner wall of the second outer shell corresponding to the heat flow pipe is provided with several flexible strips.

[0010] Furthermore, the cryogenic gas control mechanism includes a mounting box, which is coaxially disposed inside the venturi tube. The mounting box has several rotating shafts arranged circumferentially, and the two ends of the rotating shafts are rotatably connected to the mounting box and the venturi tube, respectively. Each rotating shaft is fixed with a fan blade.

[0011] Furthermore, a bevel gear is coaxially rotatably mounted inside the mounting box. Each of the rotating shafts passes through the side wall of the mounting box and extends into the interior of the mounting box. A bevel gear that meshes with the bevel gear is fixedly sleeved at one end of each rotating shaft inside the mounting box.

[0012] Furthermore, the cryogenic gas control mechanism also includes a control box, which is fixed to the outer wall of the venturi tube. One of the rotating shafts protrudes from the venturi tube and extends into the control box. The portion of the rotating shaft located inside the control box is fixedly fitted with a worm gear. A worm is inserted through the side wall of the control box. One end of the worm meshes with the worm gear for transmission, and the other end is fixed with a handle.

[0013] Furthermore, the eddy current regulating mechanism includes a sleeve and a conical block. The sleeve has a U-shaped cross-section. The open end of the sleeve is fitted onto the end of the hot flow tube. A locking element is provided between the sleeve and the hot flow tube. The conical block is fixed to the bottom wall of the sleeve. Several through holes are provided on the sleeve.

[0014] Furthermore, the surface of the conical block is provided with a second reversible thermosensitive coating.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By making half of the eddy current generator's outer shell transparent, the formation of eddy currents inside the eddy current tube can be visually displayed, improving teaching efficiency.

[0017] 2. By setting up a venturi tube and a cryogenic gas control mechanism, the cryogenic gas after the eddy current experiment can be reused. Through the cryogenic gas control structure, the injection range or injection distance of the cryogenic gas can be controlled, so that the cryogenic gas can be used to cool the components of compressed air manufacturing equipment, etc. Attached Figure Description

[0018] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0019] Figure 1 This is a schematic diagram of the structure of a vortex demonstration teaching aid suitable for teaching.

[0020] Figure 2This is a cross-sectional view of a vortex demonstration teaching aid applicable to teaching according to this utility model.

[0021] Figure 3 yes Figure 2 A magnified structural diagram of point A in the middle.

[0022] Figure 4 This is a schematic diagram of the low-temperature gas control mechanism in a vortex demonstration teaching aid applicable to teaching.

[0023] Figure 5 This is a cross-sectional view of a low-temperature gas control mechanism in a vortex demonstration teaching aid applicable to teaching, according to this utility model.

[0024] Figure 6 yes Figure 5 A magnified structural diagram at point B in the middle.

[0025] In the above figures: 1. First outer shell; 2. Second outer shell; 3. Vortex generating chamber; 4. Hot flow pipe; 5. Cold flow pipe; 6. Compressed air inlet; 7. Flexible strip; 8. Hollow tube; 9. Fixing component; 10. Locking component; 11. Conical block; 12. Sleeve; 13. Through hole; 14. Mounting box; 15. Control box; 16. Rotating shaft; 17. Fan blade; 18. Bevel gear; 19. Conical gear; 20. Worm gear; 21. Worm; 22. Handle; 23. Venturi tube. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known mechanisms and their descriptions may be omitted in the figures.

[0027] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. In the description of this application, terms such as "first", "second", etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] like Figure 1-6 As shown in the figure, this utility model embodiment proposes an eddy current demonstration teaching aid suitable for teaching, including an eddy current generator composed of a first outer shell 1 and a second outer shell 2. The first outer shell 1 is a transparent shell, and the second outer shell 2 is an opaque shell. In this embodiment, the first outer shell 1 and the second outer shell 2 are symmetrically distributed and sealed together by adhesive. By setting the first outer shell 1 and the second outer shell 2, compared with most eddy current teaching devices on the market that are made of metal integral structure, the cost of this teaching device is effectively reduced, realizing the role of low-cost teaching promotion. At the same time, the first outer shell 1 allows the internal structure of the eddy current generator to be displayed intuitively, improving teaching efficiency. The eddy current generator is hollow inside. The left end of the eddy current generator is a slender hot flow pipe 4, and the right end is a cold flow pipe 5. The middle of the eddy current generator is provided with an eddy current generating chamber 3. The connection between the hot flow pipe 4, the eddy current generating chamber 3, and the cold flow pipe 5 is all integrally formed, and the hot flow pipe 4, the eddy current generating chamber 3, and the cold flow pipe 5 are connected in sequence. A compressed air inlet is provided on the top of the outer wall of the vortex generating chamber 3, and a compressed air inlet 6 is provided through the compressed air inlet, allowing compressed air from an external air source to enter the vortex generating chamber 3. A vortex regulating mechanism is detachably connected to the left end of the hot flow pipe 4. The inner wall of the second outer shell 2 corresponding to the hot flow pipe 4 is coated with a first reversible thermosensitive coating. A hollow tube 8 is provided axially at the center of the hot flow pipe 4, with an outer diameter smaller than the inner diameter of the hot flow pipe 4. The outer wall of the hollow tube 8 is coated with a second reversible thermosensitive coating. The color-changing properties of both the first and second reversible thermosensitive coatings can respond to changes in the vortex temperature gradient inside the vortex pipe. In this embodiment, the first reversible thermosensitive coating changes color to correspond to high-temperature gas, turning orange when high-temperature gas passes through. The second reversible thermosensitive coating changes color to correspond to low-temperature gas, turning blue when low-temperature gas passes through. When the temperature returns to its original value, the colors of both coatings also return to normal, facilitating repeated teaching use.

[0029] The left end of the cold flow tube 5 extends into the vortex generating chamber 3 and mates with the compressed air inlet 6. The right end is connected to a Venturi tube 23, with a cryogenic gas control mechanism at the end of the Venturi tube 23. The inner wall of the second outer casing 2 corresponding to the cold flow tube 5 is coated with a second reversible thermosensitive coating to indicate the flow path of the cryogenic gas. In this embodiment, the compressed air inlet 6 is located at the top right end of the vortex generating chamber 3, and the compressed air inlet 6 faces the outer wall of the cold flow tube 5. When compressed air enters the vortex generating chamber 3, the compressed air is cooled by the cold air... After the outer wall of the flow tube 5 is acted upon, a vortex is formed and moves to the left; the venturi tube 23 can be integrally formed and installed at the end of the cold flow tube 5, or a threaded hole can be opened at the left end of the venturi tube 23, and the left end of the venturi tube 23 is fitted outside the right end of the cold flow tube 5. The inner diameter of the left end of the venturi tube 23 is the same as the outer diameter of the right end of the cold flow tube 5. It is then connected to the threaded hole by bolt thread and abuts against the outer wall of the cold flow tube 5, forming a locking and fixing of the venturi tube 23 and the cold flow tube 5, and making the cold flow tube 5 and the venturi tube 23 connected.

[0030] A fixing member 9 is provided between the hollow tube 8 and the hot flow tube 4. In this embodiment, the fixing member 9 is rod-shaped. The left and right ends of the hollow tube 8 are respectively connected to the hot flow tube 4 through the fixing member 9. The top end of the fixing member 9 is fixedly connected to the inner side wall of the hot flow tube 4, and the bottom end is fixedly connected to the hollow tube 8, thus supporting and fixing the hollow tube 8, so that the hollow tube 8 is suspended in the air.

[0031] The inner wall of the second outer shell 2 corresponding to the hot flow tube 4 is provided with a number of flexible strips 7. In this embodiment, the flexible strips are arranged in two rows along the circumference of the second outer shell 2. Each row of flexible strips includes a number of small flexible strips 7 distributed at equal intervals along the axial direction of the hot flow tube 4. The flexible strips 7 can rotate with the vortex, which further facilitates the intuitive demonstration to trainees of the gas splitting process of compressed air inside the vortex tube.

[0032] The eddy current regulating mechanism includes a sleeve 12 and a conical block 11. The sleeve 12 has a U-shaped cross-section, and its open end is fitted onto the end of the hot flow pipe 4. A locking element 10 is provided between the sleeve 12 and the hot flow pipe 4. The conical block 11 is fixed to the bottom wall of the sleeve 12, and several through holes 13 are provided on the sleeve 12. The surface of the conical block 11 is coated with a second reversible thermosensitive coating to indicate the flow path of the low-temperature gas. In this embodiment, the locking member 10 is a bolt. A threaded hole is opened on each of the upper and lower sides of the side wall of the sleeve 12. One end of the locking member 10 is threaded into the threaded hole and abuts against the outer wall of the heat flow pipe 4, thereby locking and fixing the heat flow pipe 4 and the sleeve 12. The tip of the conical block 11 faces the heat flow pipe 4. The conical block 11 is used to bounce the low-temperature gas that has moved to the center of the sleeve 12, causing it to return to the right along the original path. The high-temperature gas that has moved to the sleeve 12 and is close to the wall of the heat flow pipe 4 is discharged directly through the through hole 13. The conical block 11 is fixedly installed on the bottom wall of the sleeve 12 by bolts. By turning the bolts, the left and right positions of the conical block 11 can be adjusted to accommodate low-temperature gases of different temperatures, so as to achieve the ideal bounce effect.

[0033] The cryogenic gas control mechanism includes a mounting box 14, which is coaxially disposed inside the venturi tube 23. The mounting box 14 has a regular hexagonal cross-section and six rotating shafts 16 are evenly arranged circumferentially on the mounting box 14. The two ends of the rotating shafts 16 are rotatably connected to the side wall of the mounting box 14 and the side wall of the venturi tube 23 respectively through bearings. Each rotating shaft 16 is fixed with a fan blade 17. A bevel gear 18 is coaxially rotatably mounted inside the mounting box 14. Each rotating shaft 16 passes through the side wall of the mounting box 14 and extends into the interior of the mounting box 14. A bevel gear 19 that meshes with the bevel gear 18 is fixedly sleeved at one end of each rotating shaft 16 inside the mounting box 14. The cryogenic gas control mechanism also includes a control box 15, which is fixed to the top of the outer wall of the venturi tube 23. One of the rotating shafts 16 protrudes from the venturi tube 23 and extends into the control box 15. A worm gear 20 is fixedly fitted onto the portion of the rotating shaft 16 inside the control box 15. A worm 21 passes through the side wall of the control box 15. One end of the worm 21 meshes with the worm gear 20 for transmission, and the other end is fixed with a handle 22. In this embodiment, by rotating the handle 22, the worm 21 rotates, which drives the worm gear 20 and the rotating shaft 16 directly above it to rotate. The rotating shaft 16 drives one of the bevel gears 19 to rotate, which in turn drives the bevel gear 18 to rotate. The bevel gear 18 drives the other five bevel gears 19 to rotate, ultimately causing all six rotating shafts 16 and the fan blades 17 to rotate simultaneously. This achieves the effect of controlling the size of the opening at the right end of the venturi tube 23, thereby adjusting whether the passing cryogenic gas is sprayed out in a scattered or direct manner. This portion of the cryogenic gas can be used to cool the components of the compression control manufacturing equipment, thus achieving secondary utilization.

[0034] In the above embodiments, neither the first reversible thermosensitive coating nor the second reversible thermosensitive coating is shown in the figure. The first reversible thermosensitive coating may be an iodide or a cholesteric liquid crystal, etc., and the second reversible thermosensitive coating may be a cobalt chloride hexamethylenetetramine complex salt, etc.

[0035] In the above embodiments, the sleeve 12 and the venturi tube 23 can also be designed to be semi-transparent, which can fully demonstrate the entire process of compressed air generating vortex motion and improve the teaching effect.

[0036] Working principle:

[0037] The eddy current teaching device is placed horizontally, with the first outer shell 1 facing the student. An external air source introduces compressed air into the eddy current generating chamber 3 through the compressed air inlet 6, generating eddy current gas that moves towards the left end of the entire device. High-temperature gas approaches the wall of the hot flow tube 4, while low-temperature gas is located at the center of the hot flow tube 4. When the eddy current gas moves into the sleeve 12, the high-temperature gas exits through the through-hole 13, and the low-temperature gas rebounds after being bounced off the cone block 11 and returns along the same path, finally exiting through the cold flow tube 5 and the Venturi tube 23. When the high-temperature gas passes through the inner wall of the second outer shell 2 corresponding to the hot flow tube 4, Under the action of the first reversible thermosensitive coating, the inner wall of the second outer shell 2 changes color (e.g., from the initial color to orange). When the low-temperature gas passes through the inner walls of the hollow tube 8, the conical block 11, and the cold flow tube 5, under the action of the second reversible thermosensitive coating, the outer wall of the hollow tube 8, the surface of the conical block 11, and the inner wall of the cold flow tube 5 change color (e.g., from the initial color to blue). Simultaneously, the small, flexible strip 7 rotates with the vortex, facilitating a direct demonstration to trainees of the gas splitting and dynamic temperature gradient changes within the vortex tube. Finally, by rotating the handle 22, the opening size of the venturi tube 23 is controlled, thereby controlling the injection speed, injection range, and injection distance of the low-temperature gas, which can cool the internal components of the compression control manufacturing equipment.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A teaching aid for demonstrating eddy currents, characterized in that: The device includes an eddy current generator, which comprises a first housing and a second housing. The first housing is transparent and the second housing is opaque. One end of the eddy current generator is connected to an eddy current adjustment mechanism, and the other end is connected to a venturi tube. A cryogenic gas control mechanism is provided at the end of the venturi tube.

2. The eddy current demonstration teaching aid suitable for teaching according to claim 1, characterized in that: The eddy current generator has a hot flow tube at one end and a cold flow tube at the other end. The eddy current generator has an eddy current generating chamber in the middle. The hot flow tube, the eddy current generating chamber, and the cold flow tube are connected in sequence. The outer wall of the eddy current generating chamber has a compressed air inlet. The eddy current regulating mechanism is detachably installed at the end of the hot flow tube. The inner wall of the second outer shell corresponding to the hot flow tube is provided with a first reversible thermosensitive coating. A hollow tube is provided axially at the center of the hot flow tube. The outer wall of the hollow tube is provided with a second reversible thermosensitive coating.

3. The eddy current demonstration teaching aid suitable for teaching according to claim 2, characterized in that: One end of the cold flow tube extends into the vortex generating chamber and is connected to the compressed air inlet, while the other end is connected to the Venturi tube. The inner wall of the second outer shell corresponding to the cold flow tube is provided with a second reversible thermosensitive coating.

4. The eddy current demonstration teaching aid suitable for teaching according to claim 2, characterized in that: A fastener is provided between the hollow tube and the hot flow tube.

5. The eddy current demonstration teaching aid suitable for teaching according to claim 2, characterized in that: The inner wall of the second outer shell corresponding to the heat flow pipe is provided with several flexible strips.

6. The eddy current demonstration teaching aid suitable for teaching according to claim 1, characterized in that: The cryogenic gas control mechanism includes a mounting box, which is coaxially disposed inside a venturi tube. The mounting box has several rotating shafts along its circumference, and the two ends of each rotating shaft are rotatably connected to the mounting box and the venturi tube, respectively. Each rotating shaft is fixed with a fan blade.

7. A teaching aid for eddy current demonstrations according to claim 6, characterized in that: Inside the mounting box, bevel gears are coaxially rotatably mounted. Each shaft passes through the side wall of the mounting box and extends into the interior of the mounting box. At one end of each shaft inside the mounting box, a bevel gear is fixedly fitted to mesh with the bevel gear for transmission.

8. A teaching aid for eddy current demonstrations according to claim 6, characterized in that: The cryogenic gas control mechanism also includes a control box, which is fixed to the outer wall of the venturi tube. One of the rotating shafts protrudes from the venturi tube and extends into the control box. The portion of the rotating shaft located inside the control box is fixedly fitted with a worm gear. A worm is inserted through the side wall of the control box. One end of the worm meshes with the worm gear for transmission, and the other end is fixed with a handle.

9. A teaching aid for eddy current demonstrations according to claim 2, characterized in that: The eddy current regulating mechanism includes a sleeve and a conical block. The sleeve has a U-shaped cross-section. The open end of the sleeve is fitted onto the end of the hot flow tube. A locking element is provided between the sleeve and the hot flow tube. The conical block is fixed to the bottom wall of the sleeve. Several through holes are provided on the sleeve.

10. A teaching aid for eddy current demonstrations according to claim 9, characterized in that: The surface of the conical block is coated with a second reversible thermosensitive coating.

Images