Magnetic stirrer

Abstract

The utility model relates to a magnetic stirrer and belongs to the technical field of magnetic stirring, the magnetic stirrer comprises a shell, a magnetic driving piece arranged in the shell and a stirrer corresponding to the magnetic driving piece, the shell comprises a shell body and a bottom plate arranged at the bottom of the shell body, a through groove is formed in the bottom plate, and the magnetic driving piece is arranged in the shell body. And a side hole is formed in the side wall of the shell, the through groove is used for introducing cold air into the shell, and the side hole is used for discharging heat in the shell. In the working process of the magnetic stirrer, heat is generated in the shell, air in the shell flows upwards after being heated, cold air enters the shell from the through groove, penetrates through the flow guide hole, absorbs heat and then is discharged from the side hole in one side of the top of the flow guide shell, the heat emitted by the magnetic stirrer can be effectively absorbed, and the service life of the magnetic stirrer is prolonged. And the influence of heat generated by the magnetic driving part on the experiment is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic stirring, and in particular relates to a magnetic stirrer. Background Art

[0002] A magnetic stirrer is a stirring device for mixing liquids. The device has several magnetic drive components built in. The output end of the magnetic drive components has two symmetrical magnets with opposite polarities. When stirring the liquid, place the liquid container above the magnetic drive component, put a magnetic stirrer into the container, start the magnetic drive component, and the two magnets on the magnetic drive component rotate. The principle of magnetic field that like charges repel and opposite charges attract is used to drive the stirrer to rotate, thereby achieving the purpose of stirring the liquid.

[0003] Compared with traditional stirrers, magnetic stirrers do not need to set up a mechanical transmission structure inside the container, which can avoid direct contact between the power source and the liquid, reduce the noise and impact generated by the high-speed rotation of the stirring parts, and control the stirring force more accurately. Therefore, they are often used in more precise chemical experiments. Although existing magnetic stirrers can also perform multi-channel stirring, each magnetic drive part shares the same power source, and it is impossible to perform magnetic stirring at the same time for several groups of solutions with different speed requirements. In addition, the application scenarios of magnetic stirrers have high requirements for temperature control, and it is necessary to avoid abnormal fluctuations in the temperature field around the stirring liquid as much as possible. The heat dissipation capacity of existing magnetic stirrers is lacking. During the stirring process, the magnetic stirrer is prone to local overtemperature. When multiple containers are stirred at the same time, the temperature field control of the stirrer is more difficult, and the abnormal temperature changes are particularly obvious. Temperature changes are more likely to affect the accuracy of experimental results. The heat dissipation capacity of the magnetic stirrer needs to be strengthened. Utility Model Content

[0004] The purpose of the utility model is to provide a magnetic stirrer in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A magnetic stirrer comprises a shell, a magnetic driving member arranged inside the shell, and a stirring bar corresponding to the magnetic driving member, wherein the shell comprises a shell and a bottom plate arranged at the bottom of the shell, a through groove is provided on the bottom plate, and a side hole is provided on the side wall of the shell, wherein the through groove is used to introduce cold air into the shell, and the side hole is used to discharge the heat inside the shell. Two mutually symmetrical and oppositely polar magnetic components are provided on the top of the magnetic driving member of the magnetic stirrer. When the liquid needs to be stirred in the experiment, a container containing the liquid is placed on the shell, and the container is placed directly above the magnetic driving member, a stirring bar is put into the container, and the magnetic driving member is started, the magnetic driving member drives the two magnetic components to rotate, and the magnetic attraction member drives the stirring bar to rotate through the magnetic field, thereby achieving stirring of the liquid. During the operation of the magnetic stirrer, heat is generated inside the shell, the air inside the shell heats up and flows upward, the hot air is discharged outward from the side hole, and the cold air enters the shell from the through groove, thereby reducing the influence of the heat generated by the magnetic driving member when it is working on the experiment.

[0007] As a further optimization solution of the present utility model, the magnetic driving components are provided in two rows, and the side holes correspond one to one to the magnetic driving components.

[0008] As a further optimization solution of the utility model, two guide shells are fixedly provided on the top of the base plate, the two rows of magnetic drive components are respectively located inside the two guide shells, and a heat dissipation channel is formed between the through groove, the guide shell and the side hole.

[0009] As a further optimization scheme of the utility model, the through slot is located between two guide shells, a guide hole is opened on the side of the guide shell facing the through slot, and the top of the guide shell is connected to the side hole, and a circuit board is provided directly above the through slot.

[0010] As a further optimization scheme of the utility model, the circuit board is located on one side of the top of the guide hole. Two groups of heat dissipation channels are formed on both sides of the circuit board. The two groups of heat dissipation channels use the through grooves on the bottom plate as air inlets, and the side holes on the top of the shell side wall are exhaust ports of each heat dissipation channel.

[0011] As a further optimization solution of the utility model, a side groove is opened at the bottom of the shell, and the height of the bottom plate is not lower than the side groove.

[0012] As a further optimization scheme of the utility model, the magnetic driving component includes a power source fixedly arranged on the base plate, and a mounting base fixedly arranged at the output end of the power source, the mounting base is used to install the magnetic component, the power source corresponds one-to-one with the guide hole, and the connection terminal of the power source is arranged toward the guide hole.

[0013] As a further optimization solution of the utility model, fan blades are fixedly provided on the outer periphery of the mounting seat.

[0014] As a further optimization solution of the utility model, a placement groove for receiving the container is provided on the top of the shell, and an anti-slip edge is provided on the surface of the placement groove.

[0015] The beneficial effects of the utility model are:

[0016] 1) In the process of working of the magnetic stirrer, heat is generated inside the shell, and the air inside the shell flows upward after heating up, the hot air is discharged outward from the side holes, and the cold air enters the shell from the through grooves, thereby reducing the influence of the heat generated by the magnetic drive component when working on the experiment;

[0017] 2) Two groups of heat dissipation channels corresponding to the magnetic driving parts are formed between the through slot and the guide shell and the side holes of the utility model. The cold air cools the magnetic stirrer along the heat dissipation channels. The cold air entering from the through slot passes through the guide holes, passes through the wiring terminals of the circuit board and the power source, and is discharged from the side holes on one side of the top of the guide shell after being heated, which can effectively absorb the heat emitted by the magnetic stirrer;

[0018] 3) The utility model provides a fan blade on the mounting seat at the output end of the power source, which is used to provide a magnetic driving part for power. When the fan blade is working, the fan blade is driven to rotate, so that the guide shell improves the suction effect of cold air, and the cold air is concentrated into the guide hole corresponding to the heating magnetic driving part, thereby improving the temperature uniformity of the entire magnetic stirrer and further reducing the abnormal temperature fluctuation in the placement tank;

[0019] 4) Each magnetic drive component of the utility model has an independent power source. Each magnetic drive component can run at the same speed to achieve uniform stirring of each channel, avoid liquid splashing, and make the magnetic stirrer more stable; it can also achieve multi-channel differential stirring. In addition to manually setting the speed, it can also be remotely controlled by the host computer to dynamically set the speed. The host computer can control dozens of magnetic stirrers at the same time and accurately control the stirring speed of each channel of each stirrer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the shell structure of the utility model;

[0022] Figure 3 It is an exploded view of the utility model;

[0023] Figure 4 It is a schematic diagram of the internal structure of the utility model;

[0024] Figure 5 It is a cross-sectional view of the shell of the utility model.

[0025] in, Figure 2 and Figure 3 This is a schematic diagram of the magnetic stirrer after flipping 90°.

[0026] In the figure: 1. outer shell; 2. magnetic drive component; 3. circuit board; 11. shell; 12. bottom plate; 13. through groove; 14. side hole; 15. guide shell; 16. guide hole; 17. side groove; 18. placement groove; 19. anti-skid edge; 21. power source; 22. mounting seat; 23. fan blade. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0028] Example

[0029] like Figure 1-3 As shown, a magnetic stirrer comprises a shell 1 and a magnetic driving member 2 arranged inside the shell 1, and a stirring bar corresponding to the magnetic driving member 2, and the stirring bar is outside the shell 1. The shell 1 comprises a shell 11 and a bottom plate 12 arranged at the bottom of the shell 11, a through groove 13 is provided on the bottom plate 12, and the through groove 13 is in a strip shape, which is arranged along the length direction of the bottom plate 12 and is located in the middle of the bottom plate 12, and a side hole 14 is provided on the side wall of the shell 11, and the side hole 14 is located at the top of the shell 11. The magnetic driving member 2 is provided in two rows, and the side holes 14 correspond to the magnetic driving member 2 one by one. The through groove 13 is used to introduce cold air into the inside of the shell 1, and the side hole 14 is used to discharge the heat inside the shell 1. The top of the magnetic driving part 2 of the magnetic stirrer is provided with two symmetrical magnetic parts with opposite polarities. When the liquid needs to be stirred in the experiment, the container containing the liquid is placed on the shell 11, and the container is placed directly above the magnetic driving part 2. A stirrer is put into the container, and the magnetic driving part 2 is started. The magnetic driving part 2 drives the two magnetic parts to rotate, and the magnetic attraction part drives the stirrer to rotate through the magnetic field, thereby stirring the liquid. During the operation of the magnetic stirrer, heat is generated inside the shell 11, and the air inside the shell 11 flows upward after heating. The hot air is discharged from the side hole 14, and the cold air enters the shell 11 from the through groove 13, reducing the influence of the heat generated by the magnetic driving part 2 during operation on the experiment.

[0030] Specifically, the number of magnetic drive parts 2 in the housing 1 is preferably ten groups, forming a ten-channel magnetic stirrer, which can be controlled by the host computer and can also be operated independently. The host computer can distribute tasks to 256 ten-channel magnetic stirrers at most through the RS485 bus. The housing 1 of the magnetic stirrer is provided with a knob-type interactive interface, which can manually set the speed of the magnetic drive part 2 through the knob, and can also remotely control the magnetic stirrer through the host computer to dynamically set the speed of the magnetic drive part 2. Each magnetic drive part 2 has an independent power source 21, which is preferably a motor, and the motor is speed-regulated using a PID algorithm. Each magnetic drive part 2 can run at the same speed, so that the stirring bar of each channel is stirred evenly, avoiding liquid splashing, and the stirrer is more stable; it can also run at different speeds to achieve multi-channel differential stirring, and the stirring speed of each channel of each magnetic stirrer can be accurately controlled by the host computer at the same time to improve experimental efficiency and experimental accuracy.

[0031] Furthermore, if Figure 3-5 As shown, two guide shells 15 are fixedly arranged on the top of the bottom plate 12, and two rows of magnetic drive components 2 are respectively located inside the two guide shells 15, and a heat dissipation channel is formed between the through slot 13 and the guide shell 15 and the side hole 14. The through slot 13 is located between the two guide shells 15, and each guide shell 15 is provided with a group of guide holes 16 on the side facing the through slot 13, and the top of the guide shell 15 is connected to the side hole 14. A circuit board 3 is arranged just above the through slot 13, and the circuit board 2 is fixedly connected to the housing 11. A control chip for controlling the magnetic drive component 2 is arranged on the circuit board 3, and the control chip is connected to the host computer via the RS485 bus. The model of the control chip is preferably LQFP 64. The circuit board 3 is located in the area between the tops of the two groups of guide holes 16. The magnetic driving component 2 includes a power source 21 fixedly mounted on the base plate 12, and a mounting base 22 fixedly mounted at the output end of the power source 21. The mounting base 22 is used to mount a magnetic component, which is preferably a magnet. The power source 21 corresponds one-to-one to the guide hole 16, and the connection terminal of the power source 21 is arranged toward the guide hole 16.

[0032] Two groups of heat dissipation channels are formed on both sides of the circuit board 3. The two groups of heat dissipation channels use the through grooves 13 on the bottom plate 12 as air inlets, and the side holes 14 on the top of the side wall of the shell 11 are the exhaust ports of each heat dissipation channel. A side groove 17 is provided at the bottom of the shell 11, and the height of the bottom plate 12 is not lower than the side groove 17. The side grooves 17 are distributed on the front and back sides and the left and right sides of the shell 11. The cold air cools the magnetic stirrer along the heat dissipation channel. The cold air entering from the through groove 13 passes through the guide hole 16, passes through the wiring terminals of the circuit board 3 and the power source 21, and is discharged from the side hole 14 on one side of the top of the guide shell 15 after being heated, which can effectively absorb the heat emitted by the magnetic stirrer.

[0033] Preferably, if Figure 4As shown, the outer periphery of the mounting seat 22 is fixed with a fan blade 23. The magnetic drive member 2 for providing power drives the fan blade 23 to rotate while working, so that the guide shell 15 improves the suction effect of the cold air, and the cold air is concentrated into the guide hole 16 corresponding to the heated magnetic drive member 2, thereby improving the temperature uniformity of the entire magnetic stirrer and further reducing abnormal fluctuations in the temperature field. In addition, a placement groove 18 for receiving a container is provided on the top of the shell 11, and an anti-slip edge 19 is provided on the surface of the placement groove 18 to prevent the container on the placement groove 18 from being offset during the stirring process.

[0034] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A magnetic stirrer, comprising a housing (1), a magnetic driving member (2) arranged inside the housing (1), and a stirring bar corresponding to the magnetic driving member (2), characterized in that: The housing (1) comprises a shell (11) and a bottom plate (12) arranged at the bottom of the shell (11); a through groove (13) is provided on the bottom plate (12); and a side hole (14) is provided on a side wall of the shell (11); the through groove (13) is used to introduce cold air into the interior of the shell (1); and the side hole (14) is used to discharge heat from the interior of the shell (1).

2. The magnetic stirrer according to claim 1, characterized in that: The magnetic driving components (2) are provided in two rows, and the side holes (14) correspond one to one with the magnetic driving components (2).

3. The magnetic stirrer according to claim 2, characterized in that: Two guide shells (15) are fixedly arranged on the top of the bottom plate (12), and the two rows of magnetic drive components (2) are respectively located inside the two guide shells (15), and a heat dissipation channel is formed between the through groove (13), the guide shell (15) and the side hole (14).

4. The magnetic stirrer according to claim 3, characterized in that: The through slot (13) is located between two flow guide shells (15); a flow guide hole (16) is provided on one side of the flow guide shell (15) facing the through slot (13); the top of the flow guide shell (15) is connected to the side hole (14); and a circuit board (3) is provided directly above the through slot (13).

5. The magnetic stirrer according to claim 4, characterized in that: The circuit board (3) is located on one side of the top of the air guide hole (16).

6. The magnetic stirrer according to claim 4, characterized in that: The bottom of the housing (11) is provided with a side groove (17), and the height of the bottom plate (12) is not lower than the side groove (17).

7. The magnetic stirrer according to claim 4, characterized in that: The magnetic driving component (2) comprises a power source (21) fixedly arranged on a bottom plate (12), and a mounting seat (22) fixedly arranged at an output end of the power source (21), wherein the mounting seat (22) is used to mount a magnetic component, the power source (21) corresponds to the guide hole (16) one by one, and the connection terminal of the power source (21) is arranged toward the guide hole (16).

8. The magnetic stirrer according to claim 7, characterized in that: The outer periphery of the mounting seat (22) is fixedly provided with fan blades (23).

9. The magnetic stirrer according to claim 1, characterized in that: The top of the housing (11) is provided with a placement groove (18) for receiving the container, and the surface of the placement groove (18) is provided with an anti-slip edge (19).

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