A temperature control device for a constant pressure dropping funnel
By using a temperature control device to heat and control the temperature of the constant pressure dropping funnel, the problem of reaction instability caused by temperature differences in the added liquid is solved, achieving safe and reliable temperature control and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI JIANXIN CHEM IND CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-16
AI Technical Summary
Existing constant pressure dropping funnels cause unstable reactions due to temperature differences when adding liquids, which may lead to safety hazards or a decline in product quality. Moreover, modifying all funnels is costly.
A temperature control device was designed, including a lifting mechanism, a positioning mechanism, and a heating element. The constant pressure dropping funnel is heated and its temperature is controlled by a graphene heating film and a thermistor temperature sensor. The lifting mechanism ensures that the heating element fits tightly against the side wall of the funnel, the positioning mechanism ensures uniform heating, and the thermistor monitors the temperature.
It enables flexible heat preservation and heating of the constant pressure dropping funnel, stabilizes the dropping temperature, avoids reaction instability and safety hazards, and reduces modification costs.
Smart Images
Figure CN224366359U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a temperature control device, and more particularly to a device that can control the liquid in a constant pressure dropping funnel to maintain a constant temperature, belonging to the technical field of constant pressure dropping funnel temperature control equipment. Background Technology
[0002] In many fields such as chemical synthesis, pharmaceuticals, and fine chemicals, constant-pressure dropping funnels are common experimental and production equipment. They are mainly used to achieve precise addition of liquid reagents, ensuring that chemical reactions proceed smoothly according to predetermined rates and conditions, thereby guaranteeing reaction conversion, selectivity, and product quality. Traditional constant-pressure dropping funnels typically only have basic dropping functions and have a relatively simple structure, mainly consisting of a glass funnel body, a dropping control device, and connecting pipes. However, in practical applications, many chemical reactions have stringent requirements for reaction temperature, and the temperature of the added liquid often directly affects the entire reaction system. Thermodynamic equilibrium and kinetic processes; when the temperature of the liquid added dropwise from a conventional constant-pressure dropping funnel differs significantly from the temperature of the reaction system, it can instantly alter the local temperature conditions of the reaction. For example, in some exothermic reactions, the rapid addition of a low-temperature liquid can cause an instantaneous acceleration of the reaction, resulting in drastic temperature fluctuations, leading to local overheating, an increase in side reactions, and even potential safety hazards due to uncontrolled reaction, such as material splashing, equipment damage, or even the risk of fire and explosion. In some temperature-sensitive organic synthesis reactions, even small temperature deviations can lead to a significant decrease in the yield of the target product, substandard product purity, and increased difficulty and cost of subsequent separation and purification. Furthermore, for some liquid reagents containing easily crystallizing or high-viscosity components, if the dropping funnel is not kept warm, the liquid may crystallize or its viscosity may increase sharply as the ambient temperature decreases or the mixture is left to stand for a long time. This will seriously hinder the smooth dropping process, causing unstable dropping speed or even clogging of the dropping channel. Once the dropping is interrupted or the speed is out of control, the entire chemical reaction process will be disrupted. Not only will it require a lot of time and effort to readjust and restore the reaction conditions, but it may also lead to the scrapping of batches of products, greatly reducing production efficiency and economic benefits. Currently, solutions to this problem, such as those published in CN, are... Patents 213446194U (Laboratory Constant Temperature and Constant Pressure Dropping Funnel) and CN216336570U (Temperature-Controllable Constant Pressure Dropping Funnel) both modify the constant pressure dropping funnel body, moving away from the conventional funnel structure. Instead, they feature an outer casing around the funnel body, filled with circulating water for insulation or heating. Since constant pressure dropping funnels come in various sizes and specifications, modifying all of them is impractical and costly. Therefore, a device is needed that can directly heat the sidewalls of existing conventional constant pressure dropping funnels, thereby saving production costs and improving usability. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a temperature control device suitable for constant pressure dropping funnels, which can flexibly and effectively perform heat preservation and heating treatment on constant pressure dropping funnels.
[0004] The problem described in this utility model is solved by the following technical solution:
[0005] A temperature control device for a constant pressure dripping funnel includes a lifting mechanism, a long vertical bar, a positioning mechanism, and a heating element. The long vertical bar is mounted on the lifting mechanism. Both the positioning mechanism and the heating element are mounted on the long vertical bar, and the heating element is in contact with the positioning mechanism. The lifting mechanism includes a flat plate, adjusting components, a vertical rod, and a sleeve. There are four adjusting components, which are respectively mounted on the four corners of the flat plate. The vertical rod is mounted on the top surface of the flat plate, and the sleeve is fitted onto the vertical rod. The sleeve has threaded holes on its side wall, and bolts pass through the threaded holes on the side wall of the sleeve and press against the side wall of the vertical rod. The side wall of the sleeve is connected to the long vertical bar via a bracket, and a display screen is mounted on the bracket. The signal output terminal of the display screen is connected to the signal input terminal of the CPU.
[0006] The above-mentioned temperature control device is applicable to a constant pressure dropping funnel. The adjusting component includes a short screw and a rubber pad. The corner of the plate is provided with a threaded hole, the short screw is threadedly connected to the threaded hole of the plate, and the bottom end of the short screw is provided with a rubber pad, which presses against the experimental table.
[0007] The above-described temperature control device for a constant pressure dropping funnel includes a positioning mechanism comprising a pressure plate, a guide plate, a rubber strip, a connecting plate, and a long screw. Guide holes are provided at both the upper and lower ends of the long vertical bar, and guide plates pass through both guide holes. A pressure plate is positioned between the same ends of the two guide plates, and a rubber strip is provided on the end face of the pressure plate near the long vertical bar. A connecting plate connects the ends of the two guide plates away from the pressure plate. A threaded hole is provided at the center of the connecting plate, and the long screw and the central threaded hole of the connecting plate form a threaded connection structure. The end of the long screw is axially connected to the side wall of the long vertical bar. The axis of the long screw is parallel to the length direction of the guide plate.
[0008] The above-described temperature control device for a constant-pressure dropping funnel includes a heating element comprising a thermistor temperature sensor and a graphene heating film. The thermistor temperature sensor is disposed on the bottom end face of the long vertical strip, and its temperature-sensing contact is pressed against the side wall of the funnel body. One end of the graphene heating film is disposed on the end face of the long vertical strip away from the pressure plate, and the other end of the graphene heating film passes around the funnel body and through the gap between the rubber strip and the long vertical strip. The graphene heating film surrounds and adheres to the outer wall of the funnel body. The signal output terminal of the thermistor temperature sensor is connected to the signal input terminal of the CPU. The signal input terminal of the graphene heating film is connected to the signal output terminal of the CPU.
[0009] This invention uses a lifting mechanism to allow a long hanging bar to press against the side wall of the funnel body along the center line; a positioning mechanism to clamp the graphene heating film, ensuring that the graphene heating film can reliably surround the funnel body and heat or insulate it; and a thermistor temperature sensor to monitor the temperature of the funnel body in real time, thereby indirectly controlling the temperature of the solution inside the funnel and keeping the temperature of the solution inside the funnel within a reasonable range. Attached Figure Description
[0010] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;
[0011] Figure 2 This is a partially enlarged structural diagram of component A of this utility model;
[0012] Figure 3 This is a two-dimensional structural diagram of the present invention from a second perspective;
[0013] Figure 4 This is a partially enlarged structural diagram of the present invention, B.
[0014] The list of items labeled in the diagram is as follows: 1. Long vertical bar, 2. Flat plate, 3. Vertical pole, 4. Sleeve, 5. Short screw, 6. Rubber pad, 7. Pressure plate, 8. Guide plate, 9. Rubber strip, 10. Connecting plate, 11. Long screw, 12. Thermistor temperature sensor, 13. Graphene heating film, 14. Funnel. Detailed Implementation
[0015] See Figure 1 , 2 3 and Figure 4 The present invention includes a lifting mechanism, a long vertical bar 1, a positioning mechanism, and a heating element; the long vertical bar 1 is disposed on the lifting mechanism; the positioning mechanism and the heating element are both disposed on the long vertical bar 1, and the heating element is in contact with the positioning mechanism; the positioning mechanism can fix one end of the graphene heating film to ensure that the graphene heating film can reliably surround the funnel 14 body.
[0016] The lifting mechanism includes a plate 2, adjusting components, a vertical rod 3, and a sleeve 4. Four adjusting components are positioned at the four corners of the plate 2. Adjusting these components adjusts the tilt of the plate 2, ultimately adjusting the tilt angle of the long vertical bar 1 so that its centerline is parallel to the centerline of the funnel 14, ensuring the sidewall of the long vertical bar 1 precisely fits against the sidewall of the funnel 14. The vertical rod 3 is positioned on the top surface of the plate 2, and the sleeve 4 is fitted onto the vertical rod 3. The sleeve 4 has threaded holes on its sidewall, through which bolts press against the sidewall of the vertical rod 3. Tightening the bolts fixes the position of the sleeve 4. Adjusting the height of the sleeve 4 adjusts the height of the long vertical bar 1, thereby adjusting the height of the graphene heating film to surround the funnel 14 at a suitable position. The sidewall of the sleeve 4 is connected to the long vertical bar 1 via a bracket, which has a display screen connected to the signal input of the CPU.
[0017] The adjusting components include short screws 5 and rubber pads 6; threaded holes are provided at the corners of the plate 2, and the short screws 5 are threadedly connected to the threaded holes of the plate 2. The bottom end of the short screws 5 is provided with rubber pads 6, and the rubber pads 6 press against the experimental table; by adjusting the position of each short screw 5 individually, the tilt of the plate 2 can be adjusted, and finally the tilt angle of the long plumb line 1 is adjusted so that it can be well aligned and contacted with the side wall of the funnel 14, so that the length of the contact surface between the long plumb line and the funnel 14 is the same as the length of the long plumb line 1. The reason for adjusting the tilt angle of the long plumb line 1 is that the outer wall of the funnel 14 is arc-shaped. If the long plumb line 1 is inserted at a perpendicular angle to the funnel 14, the length of the contact area between the long plumb line 1 and the funnel 14 will be less than the length of the long plumb line 1, and the graphene heating film will not be able to properly surround the funnel 14.
[0018] The positioning mechanism includes a pressure plate 7, a guide plate 8, a rubber strip 9, a connecting plate 10, and a long screw 11. Guide holes are provided at both the upper and lower ends of the long vertical bar 1, and guide plates 8 pass through both guide holes. A pressure plate 7 is positioned between the same ends of the two guide plates 8, and a rubber strip 9 is positioned on the end face of the pressure plate 7 near the long vertical bar 1. A connecting plate 10 connects the ends of the two guide plates 8 away from the pressure plate 7. The function of the guide plate 8 is to ensure that the rubber strip 9 can smoothly approach and clamp the graphene heating film 13. A screw is positioned at the center of the connecting plate 10. The long screw 11 and the central threaded hole of the connecting plate 10 form a threaded connection structure; the end of the long screw 11 is axially connected to the side wall of the long vertical bar 1; the axis of the long screw 11 is parallel to the length direction of the guide plate 8; by rotating the long screw 11, the connecting plate 10 can be moved closer to or away from the long vertical bar 1, which in turn moves the pressure plate 7 closer to or away from the long vertical bar 1. After the rubber strip 9 on the pressure plate 7 approaches the long vertical plate 1 and presses against the graphene heating film 13, the position of the graphene heating film 13 can be restricted, so that it can reliably surround the funnel 14.
[0019] The heating element includes a thermistor temperature sensor 12 and a graphene heating film 13. The thermistor temperature sensor 12 is disposed on the bottom end face of the long vertical bar 1, and its temperature measuring contact is pressed against the side wall of the funnel 14. When the long vertical bar 1 is pressed against the funnel body, the temperature measuring contact of the thermistor temperature sensor 12 is also pressed tightly against the outer wall of the funnel, thereby monitoring the temperature of the funnel body and indirectly controlling the temperature of the solvent inside by controlling the temperature of the funnel. One end of the graphene heating film 13 is disposed on the end face of the long vertical bar 1 away from the pressure plate 7, and the other end of the graphene heating film 13 passes around the funnel 14 body. The graphene heating film 13 passes through the gap between the rubber strip 9 and the long vertical strip 1; after wrapping around the funnel 14, its movable end passes through the gap between the rubber strip 9 and the long vertical strip 1. By tightening the long screw, the rubber strip 9 can be pressed tightly against the movable end of the graphene heating film 13, ensuring that the graphene heating film 13 can reliably wrap the funnel 14 without falling off; the graphene heating film 13 surrounds and adheres to the outer wall of the funnel 14; the signal output terminal of the thermistor temperature sensor 12 is connected to the signal input terminal of the CPU; the signal input terminal of the graphene heating film 13 is connected to the signal output terminal of the CPU.
[0020] The CPU module in this invention is model 87C196KC.
[0021] Operating principle: When heating or maintaining the temperature of the solvent in funnel 14 is required, place this device on the experimental table next to the constant pressure dropping funnel. Adjust each short screw 5 so that the center line of the long pendant 1 is parallel to the center line of the funnel body, so that the side wall of the long pendant 1 is pressed against the side wall of the funnel body. Then, vertically adjust the position of the sleeve 4 so that the long pendant 1 is at the lower-middle height of the funnel body. Then, pull the graphene heating film to surround the funnel body, with the movable end of the graphene heating film passing through the gap between the long pendant 1 and the rubber pad 6. Then, rotate the long screw so that the rubber pad presses against the movable end of the graphene heating film, fixing the position of the graphene heating film to reliably surround the funnel body. Wrap the funnel body; then turn on the power, input the preset temperature range into the display screen, and the graphene heating film heats the funnel. After heating to the preset temperature, the thermistor temperature sensor senses that the temperature has reached the specified temperature range and begins to maintain the temperature, controlling the funnel temperature to remain within the preset temperature range. The funnel body transfers heat to the solvent inside, and the temperature of the funnel body gradually raises the temperature of the solvent inside. Finally, the temperature of the solvent approaches the temperature of the funnel, thus achieving the experimental purpose. After the constant pressure dropping funnel experiment is completed, turn off the power, rotate the long bolt in the opposite direction to loosen the rubber pad 6 from the graphene heating film, and remove the device.
Claims
1. A temperature control device suitable for a constant pressure dropping funnel, characterized in that: The device includes a lifting mechanism, a long vertical bar (1), a positioning mechanism, and a heating element; the long vertical bar (1) is mounted on the lifting mechanism; the positioning mechanism and the heating element are both mounted on the long vertical bar (1), and the heating element is in contact with the positioning mechanism; the lifting mechanism includes a plate (2), an adjusting component, a vertical rod (3), and a sleeve (4); there are four adjusting components, which are respectively mounted on the four corners of the plate (2); the vertical rod (3) is mounted on the top surface of the plate (2), and the sleeve (4) is mounted on the vertical rod (3). The sleeve (4) has a threaded hole on its side wall, and its bolt passes through the threaded hole on the side wall of the sleeve (4) and presses against the side wall of the vertical rod (3); the side wall of the sleeve (4) is connected to the long vertical bar (1) through a bracket, and a display screen is mounted on the bracket, and the signal output terminal of the display screen is connected to the signal input terminal of the CPU.
2. The temperature control device for a constant pressure dropping funnel according to claim 1, characterized in that: The adjustment component includes a short screw (5) and a rubber pad (6); the corner of the plate (2) is provided with a threaded hole, the short screw (5) is threadedly connected to the threaded hole of the plate (2), the bottom end of the short screw (5) is provided with a rubber pad (6), and the rubber pad (6) presses against the experimental table.
3. The temperature control device for a constant pressure dropping funnel according to claim 2, characterized in that: The positioning mechanism includes a pressure plate (7), a guide plate (8), a rubber strip (9), a connecting plate (10), and a long screw (11). The long vertical bar (1) has guide holes at both ends, and guide plates (8) pass through both guide holes. A pressure plate (7) is provided between the same ends of the two guide plates (8), and a rubber strip (9) is provided on the end face of the pressure plate (7) near the long vertical bar (1). A connecting plate (10) is connected between the ends of the two guide plates (8) away from the pressure plate (7). A threaded hole is provided at the center of the connecting plate (10), and the long screw (11) and the center threaded hole of the connecting plate (10) form a threaded connection structure. The end of the long screw (11) is axially connected to the side wall of the long vertical bar (1). The axis of the long screw (11) is parallel to the length direction of the guide plate (8).
4. The temperature control device for a constant pressure dropping funnel according to claim 3, characterized in that: The heating element includes a thermistor temperature sensor (12) and a graphene heating film (13); the thermistor temperature sensor (12) is disposed on the bottom end face of the long vertical bar (1), and its temperature measuring contact is pressed against the side wall of the funnel (14); one end of the graphene heating film (13) is disposed on the end face of the long vertical bar (1) away from the pressure plate (7), and the other end of the graphene heating film (13) passes around the funnel (14) body and passes through the gap between the rubber strip (9) and the long vertical bar (1); the graphene heating film (13) surrounds and adheres to the outer wall of the funnel (14) body; the signal output end of the thermistor temperature sensor (12) is connected to the signal input end of the CPU; the signal input end of the graphene heating film (13) is connected to the signal output end of the CPU.