Reduced-pressure rotary evaporator for chemical experiment

Abstract

The utility model relates to the technical field of decompression rotary evaporators, in particular to a decompression rotary evaporator for chemical experiments, which comprises a bath pan main body and a support frame body arranged on one side of the bath pan main body, and a distillation reaction component used for separating chemical mixtures is arranged on the support frame body. The distillation reaction assembly comprises a reaction flask arranged on the bath pot main body and a discharge pipe integrally formed at an outlet of the reaction flask, a distillation pipe is movably sealed at one end of the discharge pipe, and a condensation pipe is fixed at one end of the distillation pipe. According to the utility model, the condition that liquid in the condensation pipe cannot smoothly flow to influence the normal operation of an experiment is avoided, so that the temperature and gas pressure in the condensation pipe are more stable, steam can be quickly condensed into liquid, the condensation efficiency is improved, the stable pressure in the whole distillation process can be kept, and the distillation process is more stable; and liquid evaporation or instability of steam flow caused by pressure change is avoided.

Description

Technical Field

[0001] This utility model relates to the field of vacuum rotary evaporator technology, and in particular to a vacuum rotary evaporator for chemical experiments. Background Technology

[0002] A vacuum rotary evaporator is a common laboratory device widely used in chemistry, biology, medicine and other fields. It is mainly used to keep samples at a constant temperature for heating, reaction or culture. In the process of distilling chemical mixtures, the vapor evaporated from the flask enters the condenser through the distillation tube and condenses into liquid to form the distillate. However, due to the heating of the flask, the gas pressure inside increases, which causes a negative pressure in the condenser, making it difficult for the liquid to flow out smoothly. This results in a decrease in the condensation efficiency of the condenser and poor practicality. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a reduced-pressure rotary evaporator for chemical experiments, which solves the problem that negative pressure easily forms inside the condenser tubes of existing technologies, thus affecting the outflow of liquid.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A vacuum rotary evaporator for chemical experiments includes a bath body and a support frame disposed on one side of the bath body. The support frame is equipped with a distillation reaction assembly for separating chemical mixtures. The bath body undergoes distillation at a constant temperature. The distillation reaction assembly includes a reaction flask disposed on the bath body and a discharge pipe integrally formed at the outlet of the reaction flask. One end of the discharge pipe is movably sealed with a distillation tube, and the other end of the distillation tube is fixedly connected to a condenser tube. The bottom of the condenser tube is fixedly connected to a collection tank, and both ends of the top of the collection tank are fixedly connected to exhaust pipes. A pressure valve is fixedly attached to the top of one of the exhaust pipes, and a vent pipe is fixedly connected to the outlet end of the pressure valve. A drive mechanism is provided on the support frame to drive the discharge pipe and the reaction flask to rotate simultaneously.

[0006] Preferably, one end of the vent tube is fixedly connected to a connecting tube fixed to one end of the distillation tube.

[0007] Preferably, the driving component includes a positioning seat rotatably mounted on the discharge pipe, and a connecting seat fixedly mounted at one end of the positioning seat and detachably connected to the support frame.

[0008] Preferably, a PTFE motor is fixedly installed on the positioning seat, and the output shaft of the PTFE motor drives the discharge pipe to rotate.

[0009] Preferably, a support sleeve is fixedly provided on the top of the condenser tube, and a connecting rod that is detachably connected to the support frame is fixedly provided at one end of the support sleeve.

[0010] Preferably, the bottom of the liquid collection tank is provided with a support ring, and one end of the support ring is provided with a positioning rod that is fixed to the support frame.

[0011] This invention provides a vacuum rotary evaporator for chemical experiments, which has the following advantages compared with the prior art:

[0012] 1. This utility model maintains stable pressure inside the condenser tube during the separation of chemical mixtures by setting up a distillation reaction component, ensuring that the liquid inside the condenser tube can flow out smoothly. This avoids situations where the liquid inside the condenser tube cannot flow smoothly and affect the normal progress of the experiment, making the temperature and gas pressure inside the condenser tube more stable. The vapor can be quickly condensed into liquid, improving the condensation efficiency. At the same time, it can maintain stable pressure throughout the distillation process, making the distillation process more stable and avoiding liquid evaporation or unstable vapor flow caused by pressure changes.

[0013] 2. This utility model reduces the risk of accidents caused by unstable gas pressure by keeping the reaction flask, distillation tube, condenser and liquid collection tank under normal working pressure, thereby reducing the risk of rupture or leakage and enhancing the safety of the experiment. At the same time, avoiding negative pressure can reduce the possibility of equipment wear and damage and extend the service life of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0016] Figure 3 This is a front view of the present invention.

[0017] In the diagram: 1. Bathtub body; 2. Support frame;

[0018] 3. Distillation reaction assembly; 31. Reaction flask; 32. Discharge tube; 33. Distillation tube;

[0019] 34. Condenser coil; 341. Support sleeve; 342. Connecting rod;

[0020] 35. Liquid collecting tank; 351. Support ring; 352. Positioning rod;

[0021] 36. Exhaust pipe; 37. Pressure valve body; 38. Vent pipe;

[0022] 39. Driving component; 391. Positioning seat; 392. Connecting seat; 393. Servo motor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] The main function of a vacuum rotary evaporator in the distillation process is to provide a stable heating temperature, allowing the liquid in the mixture to evaporate at a specific temperature, thereby achieving separation. Figure 1 - Figure 3 One embodiment of this utility model is a vacuum rotary evaporator for chemical experiments, comprising a bath body 1, a support frame 2, and a distillation reaction assembly 3. The support frame 2 is disposed on one side of the bath body 1, and the bath body 1 carries out a distillation reaction at a constant temperature. The distillation reaction assembly 3 is disposed on the support frame 2 for separating chemical mixtures.

[0025] To stabilize the temperature and gas pressure within the condenser 34 and ensure smooth liquid outflow, the distillation reaction assembly 3 includes a reaction flask 31 mounted on the bath body 1 and an outlet pipe 32 integrally formed at the outlet of the reaction flask 31. One end of the outlet pipe 32 is movably sealed to a distillation tube 33, and the other end of the distillation tube 33 is fixedly connected to the condenser 34. The condenser 34 consists of an inner tube and an outer tube. Cooling water flows through the outer tube, while steam flows through the inner tube. This increases the contact area between the steam and cooling water, thereby improving heat exchange efficiency and allowing the steam to cool and condense into liquid more rapidly. The bottom of pipe 34 is fixedly connected to a liquid collecting tank 35. The top two ends of the liquid collecting tank 35 are respectively fixedly connected to exhaust pipes 36. One of the exhaust pipes 36 is fixedly connected to a pressure valve body 37. The outlet end of the pressure valve body 37 is fixedly connected to a vent pipe 38. The vent pipe 38 connects the liquid collecting tank 35 and the distillation tube 33. The exhaust pipe 36 and the vent pipe 38 are controlled by the pressure valve body 37, so that the staff can adjust the air pressure in the liquid collecting tank 35 and the distillation tube 33 according to the actual situation to ensure that the condenser tube 34, the liquid collecting tank 35 and the distillation tube 33 are under the same air pressure. One end of the vent pipe 38 is fixedly connected to a connecting pipe fixed to one end of the distillation tube 33.

[0026] A support sleeve 341 is fixedly installed at the top of the condenser tube 34. A connecting rod 342 that is detachably connected to the support frame 2 is fixedly installed at one end of the support sleeve 341 to support and fix the condenser tube 34. Disassembly is also more convenient when the condenser tube 34 needs maintenance. A support ring 351 is installed at the bottom of the liquid collection tank 35. A positioning rod 352 that is fixed to the support frame 2 is installed at one end of the support ring 351 to support and fix the liquid collection tank 35. Disassembly is also more convenient when the liquid collection tank 35 needs maintenance.

[0027] A drive unit 39 is provided on the support frame 2 to drive the discharge pipe 32 and the reaction flask 31 to rotate simultaneously. The drive unit 39 includes a positioning seat 391 rotatably mounted on the discharge pipe 32 and a connecting seat 392 fixedly mounted at one end of the positioning seat 391 and detachably connected to the support frame 2. A PTFE motor 393 is fixedly mounted on the positioning seat 391, and the output shaft of the PTFE motor 393 drives the discharge pipe 32 to rotate. The output shaft of the PTFE motor 393 drives the discharge pipe 32 to rotate, which in turn drives the reaction flask 31 to rotate on the bath body 1. When the reaction flask 31 rotates continuously, it can ensure that the substances in the reaction liquid are fully mixed, which helps to improve the reaction rate and efficiency. At the same time, the continuously rotating reaction flask 31 can enhance the heat exchange between the liquid and the heating source, ensuring that the heat is evenly transferred to the entire solution, avoiding excessively high or low local temperatures of the liquid, thereby improving the effect of distillation or reaction. It can also prevent precipitates or crystals from accumulating at the bottom of the flask, thereby maintaining the normal progress of the reaction.

[0028] The control method of the PTFE motor 393 of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply ground is also common knowledge in the art. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum rotary evaporator for chemical experiments, comprising a bath body (1) and a support frame (2) disposed on one side of the bath body (1), characterized in that: The support frame (2) is provided with a distillation reaction assembly (3) for separating chemical mixtures, and the bath body (1) carries out the distillation reaction at a constant temperature; The distillation reaction assembly (3) includes a reaction flask (31) mounted on the bath body (1) and an outlet pipe (32) integrally formed at the outlet of the reaction flask (31). One end of the outlet pipe (32) is movably sealed with a distillation tube (33), and one end of the distillation tube (33) is fixedly connected to a condenser tube (34). The bottom of the condenser tube (34) is fixedly connected to a collection tank (35), and the top two ends of the collection tank (35) are respectively fixedly connected to exhaust pipes (36). One of the exhaust pipes (36) is fixedly connected to a pressure valve body (37), and the outlet end of the pressure valve body (37) is fixedly connected to a vent pipe (38). A drive component (39) is provided on the support frame (2) to drive the outlet pipe (32) and the reaction flask (31) to rotate simultaneously.

2. The vacuum rotary evaporator for chemical experiments according to claim 1, characterized in that: One end of the vent tube (38) is fixedly connected to a connecting tube that is fixed to one end of the distillation tube (33).

3. The vacuum rotary evaporator for chemical experiments according to claim 1, characterized in that: The drive unit (39) includes a positioning seat (391) rotatably mounted on the discharge pipe (32) and a connecting seat (392) fixedly mounted at one end of the positioning seat (391) and detachably connected to the support frame (2).

4. The vacuum rotary evaporator for chemical experiments according to claim 3, characterized in that: A PTFE motor (393) is fixedly installed on the positioning seat (391), and the output shaft of the PTFE motor (393) drives the discharge pipe (32) to rotate.

5. The vacuum rotary evaporator for chemical experiments according to claim 1, characterized in that: A support sleeve (341) is fixedly installed on the top of the condenser tube (34), and a connecting rod (342) that is detachably connected to the support frame (2) is fixedly installed at one end of the support sleeve (341).

6. The vacuum rotary evaporator for chemical experiments according to claim 1, characterized in that: The bottom of the liquid collection tank (35) is provided with a support ring (351), and one end of the support ring (351) is provided with a positioning rod (352) that is fixed to the support frame (2).

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