A low temperature stirring device for chemical experiments

Abstract

The utility model relates to the technical field of chemical experiments, and discloses a low-temperature stirring device for chemical experiments, comprising a base, a lifting module is arranged on the base, an output end of the lifting module is connected to a fixed seat, a placement groove is arranged on the surface of the fixed seat, a reaction vessel is arranged on the placement groove, a low-temperature module is arranged at the bottom of the reaction vessel on the fixed seat, a stirring module is arranged above the reaction vessel on the base through a limit frame module, the low-temperature module comprises a semiconductor refrigeration block, a cold conduction block arranged above the semiconductor refrigeration block and a heat dissipation module arranged below the semiconductor refrigeration block, and a control module electrically connected to the low-temperature module is arranged in the base.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experiments, in particular to a low-temperature stirring device for chemical experiments. Background Art

[0002] A magnetic stirrer is a laboratory instrument used for liquid mixing. It is mainly used for stirring or simultaneously heating and stirring low-viscosity liquids or solid-liquid mixtures. Its basic principle is to use the principle of like charges repelling and opposite charges attracting in the magnetic field. The magnetic field is used to push the magnetic stirrer placed in the container to rotate in a circle, thereby achieving the purpose of stirring the liquid. In chemical experiments, some existing chemical reactions need to be carried out in a low-temperature environment. Dry ice and liquid nitrogen are mainly used on the market for low-temperature reactions. They can be used to cool reactors such as flasks, beakers and test tubes, but it is difficult to control the temperature during use. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a low-temperature stirring device for chemical experiments, which is used for realizing low-temperature reactions in chemical experiments.

[0004] The technical solution of the utility model is: a low-temperature stirring device for chemical experiments, comprising a base, a lifting module is arranged on the base, the output end of the lifting module is connected to a fixed seat, a placement groove is arranged on the surface of the fixed seat, a reaction vessel is arranged on the placement groove, a low-temperature module is arranged at the bottom of the reaction vessel of the fixed seat, the base is provided with a stirring module above the reaction vessel through a limit frame module, the low-temperature module comprises a semiconductor refrigeration block, a cooling block arranged above the semiconductor refrigeration block and a heat dissipation module arranged below the semiconductor refrigeration block, and a control module electrically connected to the low-temperature module is arranged in the base.

[0005] It can be seen from the above scheme that the control module is used to control the low-temperature module to adjust the temperature. Through input current control, high-precision temperature control of the semiconductor refrigeration plate is achieved. The lifting module is used to achieve lifting and lowering adjustment of the reaction vessel. The stirring module is used to achieve sufficient stirring of the reaction vessel to ensure its uniform temperature. The semiconductor refrigeration block is used for cooling, and the cooling block is used for heat conduction. The heat generated at the other end face of the semiconductor refrigeration plate during cooling is dissipated through the heat dissipation module.

[0006] The lifting module includes a lifting seat, a lifting motor, a transmission shaft, a first bevel gear, a second bevel gear, a screw and an adjustment seat, wherein the screw is arranged in the lifting seat, the lifting motor is arranged in the base, the output end of the lifting motor is connected to the first bevel gear through the transmission shaft, the first bevel gear is meshed with the second bevel gear, the screw is coaxially connected to the second bevel gear, the end of the screw is connected with a bearing, a nut seat is threadedly connected to the screw, the adjustment seat is fixedly connected to the nut seat, and the fixed seat is arranged on the adjustment seat. It can be seen that the lifting motor is used to drive the first bevel gear to rotate by driving the transmission shaft to rotate, the second bevel gear is meshed with the first bevel gear to realize the change of the rotation direction, the second bevel gear drives the screw to rotate, and realizes that the rotation of the nut seat on the screw is converted into the linear motion of the fixed seat, thereby realizing the lifting and lowering adjustment of the reaction vessel, and the adjustment seat is fixedly connected to the nut seat to facilitate the stability of the up and down lifting movement of the reaction vessel.

[0007] The heat dissipation module includes a heat dissipation block and a heat dissipation fan arranged below the heat dissipation block, the heat dissipation block is arranged below the semiconductor refrigeration block, a plurality of flow channels arranged at equal intervals are arranged on the heat dissipation block, a heat insulation gasket is arranged around the semiconductor refrigeration block, the heat dissipation fan is arranged at the bottom of the heat dissipation block, and a plurality of heat dissipation holes are arranged at the bottom of the fixing seat. It can be seen that the flow channel on the heat dissipation block is convenient for exchange with air to achieve rapid heat dissipation, the heat dissipation fan is used to promote air circulation and accelerate the heat dissipation rate, and the heat insulation gasket is used to keep the semiconductor refrigeration block warm and reduce the heat loss in conduction.

[0008] The control module includes a display screen and a temperature controller arranged on the base, a control button is arranged below the display screen, the temperature controller is electrically connected to the control button and the semiconductor refrigeration block respectively, and the temperature controller signal is connected to an external device. It can be seen that the control button realizes temperature control of the semiconductor refrigeration block through the temperature sensor, and the external device is connected to the temperature controller signal to realize remote control of the reaction temperature.

[0009] The limit frame module includes a limit rod, an adjustment block and a fastener, wherein the adjustment block is inserted into the limit rod, the front side of the adjustment block is connected to the stirring module, the fastener is inserted into the adjustment block, and the end of the fastener contacts the limit rod. It can be seen that the adjustment block can adjust the height of the stirring module by sliding on the limit rod, and the fastener is used to fix the adjustment block on the limit rod.

[0010] The stirring module comprises a stirring motor, a stirring seat and a stirring paddle, wherein the stirring seat is connected to the output end of the stirring motor, the stirring paddle is inserted on the stirring seat, and the stirring paddle comprises a stirring rod, a mounting head connected to the bottom of the stirring paddle, and stirring blades movably connected to both sides of the mounting head. It can be seen that the stirring motor is used to drive the stirring paddle to rotate, and the stirring paddle is detachably connected to the output end of the stirring motor through the stirring seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 It is a cross-sectional view of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the stirring module;

[0014] Figure 4 It is a structural diagram of the low temperature module. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] like Figures 1 to 4 As shown, the utility model is a low-temperature stirring device for chemical experiments, including a base 1, a lifting module 2 is arranged on the base 1, the output end of the lifting module 2 is connected to a fixed seat 3, a placement groove 31 is arranged on the surface of the fixed seat 3, a reaction vessel 4 is arranged on the placement groove 31, a low-temperature module is arranged at the bottom of the reaction vessel 4, the base 1 is provided with a stirring module above the reaction vessel 4 through a limit frame module 6, the low-temperature module includes a semiconductor refrigeration block 82, a cooling block 81 arranged above the semiconductor refrigeration block 82, and a heat dissipation module arranged below the semiconductor refrigeration block 82, and a control module electrically connected to the low-temperature module is arranged in the base 1. In this embodiment, a support seat is arranged at the four corners of the bottom of the base 1, and in another embodiment, casters for easy movement are arranged at the four corners of the bottom of the base 1, the surface of the semiconductor refrigeration block 82 needs to be coated with silicone grease, and thermal insulation cotton is arranged around the cooling block 81 in the fixed seat 3.

[0017] The lifting module 2 includes a lifting seat 20, a lifting motor 21, a transmission shaft 22, a first bevel gear 23, a second bevel gear 24, a screw 25 and an adjustment seat 27. The screw 25 is arranged in the lifting seat 20, the lifting motor 21 is arranged in the base 1, the output end of the lifting motor 21 is connected to the first bevel gear 23 through the transmission shaft 22, the first bevel gear 23 is meshed with the second bevel gear 24, the screw 25 is coaxially connected to the second bevel gear 24, the end of the screw 25 is connected to a bearing 251, a nut seat 26 is threadedly connected to the screw 25, the adjustment seat 27 is fixedly connected to the nut seat 26, and the fixed seat 3 is arranged on the adjustment seat 27. In this embodiment, sliding columns are arranged in parallel on both sides of the screw 25, the sliding columns are parallel to the screw 23, and the end of the adjustment seat 27 is connected to the fixed seat 4 after extending out of the limit groove on the lifting seat 21.

[0018] The heat dissipation module includes a heat dissipation block 83 and a heat dissipation fan 84 arranged below the heat dissipation block 83. The heat dissipation block 83 is arranged below the semiconductor refrigeration block 82. The heat dissipation block 83 is provided with a plurality of flow channels arranged at equal intervals. The semiconductor refrigeration block 82 is surrounded by thermal insulation gaskets 85. The heat dissipation fan 84 is arranged at the bottom of the heat dissipation block 83. The bottom of the fixing seat 3 is provided with a plurality of heat dissipation holes.

[0019] The control module includes a display screen 11 and a temperature controller disposed on the base 1, a control button 12 is disposed below the display screen 11, the temperature controller is electrically connected to the control button 12 and the semiconductor refrigeration block 82 respectively, and the temperature controller signal is connected to an external device. In this embodiment, a temperature sensor is inserted into the reaction vessel 4, and the temperature sensor and the display screen realize an intuitive visual display of the temperature. The external device is an electronic device such as a mobile phone, and remote temperature control is realized through the external device, which is convenient for realizing remote remote control adjustment when temperature adjustment is required in the middle of a chemical reaction.

[0020] The stirring module 7 includes a stirring motor 71, a stirring seat 72 and a stirring paddle. The stirring seat 72 is connected to the output end of the stirring motor 71. The stirring paddle is inserted on the stirring seat 72. The stirring paddle includes a stirring rod 73, a mounting head 74 connected to the bottom of the stirring paddle, and stirring blades 75 movably connected to both sides of the mounting head 74. In this embodiment, a knob 76 is provided on the stirring motor 71 for adjusting the stirring speed. The stirring blades 75 can be crossed and put together to achieve use in a small-caliber reaction vessel. After the put-together stirring paddle is placed in the reaction vessel, the put-together stirring blades 75 are unfolded after contacting the bottom wall of the reaction vessel, so that the stirring motor 71 can be rotated and driven to achieve stirring. The stirring paddle in the stirring seat 72 is easy to disassemble and replace.

[0021] The limit frame module 6 includes a limit rod 61, an adjustment block 62 and a fastener 63. The adjustment block 62 is inserted into the limit rod 61. The front side of the adjustment block 62 is connected to the stirring module 7. The fastener 63 is inserted into the adjustment block 62. The end of the fastener 63 contacts the limit rod 61. In this embodiment, the outer cover of the clamp is provided with a protective cover layer to avoid clamping the reaction instrument.

[0022] The working process of the utility model is as follows: the reaction container is placed in the reaction vessel, the lifting motor 21 drives the first bevel gear 23 to rotate, the first bevel gear 23 meshes and drives the second bevel gear 24 to mesh and transmit, the second bevel gear 24 drives the screw rod 25 to rotate, and the screw rod 25 rotates to drive the nut seat 26 to move up and down linearly, so that the fixed seat 3 drives the reaction vessel 4 to move up and down to achieve lifting and lowering, according to the required low temperature, the temperature controller controls the semiconductor refrigeration block 82 to achieve temperature adjustment, after the stirring paddles after being put together are placed in the reaction vessel 4, the stirring blades 75 put together contact the bottom wall of the reaction vessel and then unfold, the knob 76 is started, and the stirring motor 71 drives the stirring paddles to lift and lower, so as to achieve stirring in the reaction vessel 4, and the height of the stirring module 7 is adjusted by the adjustment block 62 sliding up and down on the limit rod 61, so as to achieve the relative position adjustment between the stirring module 7 and the reaction vessel 4.

[0023] Finally, it should be emphasized that the above is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low temperature stirring device for chemical experiments, characterized in that: The invention comprises a base (1), wherein a lifting module (2) is arranged on the base (1), an output end of the lifting module (2) is connected to a fixing seat (3), a surface of the fixing seat (3) is provided with a placement groove (31), a reaction vessel (4) is arranged on the placement groove (31), a low-temperature module is arranged at the bottom of the reaction vessel (4) on the fixing seat (3), a stirring module is arranged above the reaction vessel (4) on the base (1) via a limit frame module (6), the low-temperature module comprises a semiconductor refrigeration block (82), a cooling block (81) arranged above the semiconductor refrigeration block (82), and a heat dissipation module arranged below the semiconductor refrigeration block (82), and a control module electrically connected to the low-temperature module is arranged in the base (1).

2. A low temperature stirring device for chemical experiments according to claim 1, characterized in that: The lifting module (2) comprises a lifting seat (20), a lifting motor (21), a transmission shaft (22), a first bevel gear (23), a second bevel gear (24), a screw rod (25) and an adjustment seat (27); the screw rod (25) is arranged in the lifting seat (20); the lifting motor (21) is arranged in the base (1); the output end of the lifting motor (21) is connected to the first bevel gear (23) through the transmission shaft (22); the first bevel gear (23) is meshingly connected to the second bevel gear (24); the screw rod (25) is coaxially connected to the second bevel gear (24); the end of the screw rod (25) is connected to a bearing (251); a nut seat (26) is threadedly connected to the screw rod (25); the adjustment seat (27) is fixedly connected to the nut seat (26); and the fixed seat (3) is arranged on the adjustment seat (27).

3. A low temperature stirring device for chemical experiments according to claim 1, characterized in that: The heat dissipation module comprises a heat dissipation block (83) and a heat dissipation fan (84) arranged below the heat dissipation block (83); the heat dissipation block (83) is arranged below the semiconductor refrigeration block (82); a plurality of flow channels arranged at equal intervals are arranged on the heat dissipation block (83); a heat insulation gasket (85) is arranged around the semiconductor refrigeration block (82); the heat dissipation fan (84) is arranged at the bottom of the heat dissipation block (83); and a plurality of heat dissipation holes are arranged at the bottom of the fixing seat (3).

4. A low temperature stirring device for chemical experiments according to claim 1, characterized in that: The control module comprises a display screen (11) and a temperature controller arranged on the base (1); a control button (12) is arranged below the display screen (11); the temperature controller is electrically connected to the control button (12) and the semiconductor refrigeration block (82) respectively; and the temperature controller signal is connected to an external device.

5. A low temperature stirring device for chemical experiments according to claim 1, characterized in that: The limiting frame module (6) comprises a limiting rod (61), an adjusting block (62) and a fastener (63); the adjusting block (62) is inserted into the limiting rod (61); the front side of the adjusting block (62) is connected to the stirring module (7); the fastener (63) is inserted into the adjusting block (62); and the end of the fastener (63) is in contact with the limiting rod (61).

6. A low temperature stirring device for chemical experiments according to claim 1, characterized in that: The stirring module (7) comprises a stirring motor (71), a stirring seat (72) and a stirring paddle, wherein the stirring seat (72) is connected to the output end of the stirring motor (71), the stirring paddle is inserted on the stirring seat (72), and the stirring paddle comprises a stirring rod (73), a mounting head (74) connected to the bottom of the stirring paddle, and stirring plates (75) movably connected to both sides of the mounting head (74).

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