A rotary evaporator

Abstract

The utility model provides a kind of rotary evaporator, including base, support and bath kettle being fixed on the base, evaporating flask being arranged in the bath kettle, evaporating tube is equipped on the evaporating flask, the support is rotatably connected with main shaft and is equipped with power mechanism for driving the rotation of the main shaft, the main shaft is sealed and detachably connected with the evaporating tube, synchronous connecting mechanism is equipped between the main shaft and the evaporating tube, the main shaft is equipped with the capillary purging pipe coaxial with it, one end of the capillary purging pipe extends to the evaporating flask, and the other end is connected with inert purging gas bottle by rotary joint, the evaporating tube is rotatably and sealingly connected with flow guide sleeve, the evaporating tube is equipped with branch pipe in communication with the inside of the flow guide sleeve, and the flow guide sleeve is equipped with interface pipe and is connected with condensing system. The utility model can accelerate liquid evaporation and ensure heat transfer effect, effectively reduce evaporation duration.

Description

Technical Field

[0001] This utility model relates to the field of testing and experimental instruments and equipment, and in particular to a rotary evaporator. Background Technology

[0002] Rotary evaporators are commonly used in laboratories of chemistry, biology, and pharmaceuticals for the continuous distillation of large quantities of volatile solvents under reduced pressure. By rotating the evaporating flask at a constant speed, a large, uniform thin film of solution forms on the flask wall, and the combined effect of a heating bath and a condensation system greatly improves evaporation efficiency.

[0003] As evaporation nears completion, the moisture trapped between the remaining solids is hindered by the solids, slowing down the evaporation process. This results in a lengthy final stage of evaporation, requiring further transfer to equipment such as a vacuum drying oven for thorough drying. This transfer process is cumbersome and increases the chance of the sample being exposed to air. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a rotary evaporator that improves evaporation efficiency and reduces heat loss.

[0005] According to an embodiment of this utility model, a rotary evaporator includes a base, a bracket and a bath fixed on the base, and an evaporation flask disposed in the bath. The evaporation flask is provided with an evaporation tube. A main shaft is rotatably connected to the bracket and a power mechanism for driving the main shaft to rotate is provided. The main shaft is sealed and detachably connected to the evaporation tube. A synchronous connection mechanism is provided between the main shaft and the evaporation tube. A capillary purge tube coaxial with the main shaft is provided. One end of the capillary purge tube extends into the evaporation flask, and the other end is connected to an inert purge gas bottle through a rotary joint. A flow guide sleeve is rotatably and sealed to the evaporation tube. A branch pipe communicating with the inside of the flow guide sleeve is provided on the evaporation tube. An interface pipe connected to the condensation system is provided on the flow guide sleeve.

[0006] Preferably, the bathtub has an external heat insulation layer and is equipped with an inlet pipe and an outlet pipe.

[0007] More preferably, the bathtub has a cylindrical interior, with the inlet pipe tangentially connected to it, the inlet pipe located at the bottom of the bathtub, and the outlet pipe located at the top of the bathtub.

[0008] More preferably, the end of the main shaft is fixedly provided with a sealing plug that can extend into the interior of the evaporator tube and is interference-fitted therewith. The synchronous connection mechanism includes a positioning groove provided on the end face of the main shaft and a positioning protrusion provided on the end face of the evaporator tube. The end of the main shaft is rotatably connected with an internal threaded sleeve, and an external threaded sleeve is fixedly provided on the evaporator tube.

[0009] More preferably, the branch pipes are provided in multiple parts and are evenly distributed along the circumference of the evaporator pipe.

[0010] More preferably, the evaporator tube and the guide sleeve are double-layer jacketed structures with heat insulation effect.

[0011] In a further preferred embodiment, the capillary purge tube is located inside the evaporation flask and connected to a flow divider head, and the flow divider head has multiple purge holes evenly distributed along its circumference on its side.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Through the built-in capillary purge tube and splitter head, inert gas can be continuously introduced into the evaporating liquid to form a protective atmosphere, effectively preventing oxygen-sensitive materials from deteriorating during the concentration process, improving product quality and experimental safety. Furthermore, in the final stage of evaporation, the purging action and airflow can accelerate the evaporation and discharge of liquid between solid materials, improving evaporation efficiency.

[0014] The tangential inlet design of the bath creates swirling heating, resulting in more uniform heating; the insulation structure of the evaporator tube and the guide sleeve reduces heat loss during the process, thus lowering overall energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a rotary evaporator according to the present invention.

[0016] Figure 2 This utility model Figure 1 A magnified schematic diagram of part A in the middle.

[0017] Figure 3 This utility model Figure 1 A magnified schematic diagram of part B in the middle section.

[0018] In the above attached figures: 1. Base; 2. Support; 3. Bath; 301. Insulation layer; 302. Inlet pipe; 303. Outlet pipe; 4. Evaporation flask; 401. Evaporation tube; 402. Branch pipe; 5. Main shaft; 501. Sealing plug; 6. Synchronous connection mechanism; 611. Positioning groove; 612. Positioning protrusion; 621. Internal threaded sleeve; 622. External threaded sleeve; 7. Capillary purging tube; 701. Rotary joint; 702. Flow divider; 703. Purging hole; 8. Flow guide sleeve; 801. Interface pipe. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] This utility model provides an embodiment, such as Figure 1 , Figure 2As shown, a rotary evaporator includes a base 1, a bracket 2 fixed on the base 1, a bath 3, and an evaporation flask 4 disposed in the bath 3. The evaporation flask 4 is provided with an evaporation tube 401. A main shaft 5 is rotatably connected to the bracket 2 and is provided with a power mechanism to drive the main shaft 5 to rotate. In this embodiment, the power mechanism is a motor fixed on the other side of the bracket 2. The power shaft of the motor drives the main shaft 5 to rotate through a gear transmission assembly. The main shaft 5 is sealed and detachably connected to the evaporation tube 401. A synchronous connection mechanism 6 is provided between the main shaft 5 and the evaporation tube 401. When the main shaft 5 rotates, the evaporation flask 4 is driven to rotate through the synchronous connection mechanism 6.

[0021] The main shaft 5 is equipped with a capillary purge tube 7 coaxial with it. One end of the capillary purge tube 7 extends into the evaporation flask 4, and the other end is connected to an inert purge gas bottle through a rotary joint 701. The capillary purge tube 7 is also equipped with a rotor flow meter to control the purge gas flow rate as needed. The evaporation tube 401 is rotatably and sealingly connected to a flow guide sleeve 8. The evaporation tube 401 is equipped with a branch pipe 402 that communicates with the inside of the flow guide sleeve 8. The flow guide sleeve 8 is equipped with an interface pipe 801 that connects to the condensation system.

[0022] In order to prevent heat loss and ensure heating effect, in a further embodiment, the bath pot 3 is provided with a heat insulation layer 301 to reduce heat loss, and is provided with an inlet pipe 302 and an outlet pipe 303 for continuously inputting heating medium.

[0023] To improve the heat exchange effect, in a further embodiment, the bath 3 has a cylindrical space inside, and the inlet pipe 302 is connected to it tangentially. The inlet pipe 302 is located at the bottom of the bath 3, and the outlet pipe 303 is located at the top of the bath 3. The heating medium entering the bath 3 forms a rotating and rising vortex, which can heat the evaporation flask 4 evenly and effectively.

[0024] To ensure synchronized rotation, such as Figure 2As shown, the end of the main shaft 5 is fixedly provided with a sealing plug 501 that can extend into the interior of the evaporation tube 401 and is interference-fitted with it. The sealing plug 501 is made of a high-temperature resistant and solvent-resistant elastic material, such as PTFE or rubber, to achieve radial sealing. The synchronous connection mechanism 6 includes a positioning groove 611 provided on the end face of the main shaft 5 and a positioning protrusion 612 provided on the end face of the evaporation tube 401 to achieve radial dynamic sealing. The inner threaded sleeve 621 is rotatably connected to the outside of the end of the main shaft 5 through a bearing. An outer threaded sleeve 622 is fixed on the evaporation tube 401. During installation, the positioning protrusion 612 of the evaporation tube 401 is aligned with the positioning groove 611 of the main shaft 5 and inserted, so that the sealing plug 501 enters the evaporation tube 401 to achieve sealing. Then, the inner threaded sleeve 621 is tightened to engage with the outer threaded sleeve 622, so that the evaporation flask 4 is firmly locked on the main shaft 5 to achieve synchronous rotation.

[0025] In order to facilitate the entry of steam into the condensation system, in a further embodiment, the branch pipe 402 is provided in multiple parts and is evenly distributed around the evaporation pipe 401.

[0026] To prevent premature condensation of steam, in a further embodiment, the evaporator 401 and the guide sleeve 8 are double-layered jacket structures with heat insulation effect, which effectively isolate heat exchange and prevent steam from condensing during the journey.

[0027] To ensure that the capillary purge tube 7 can purge the material at the bottom at all times during the rotation of the evaporating flask 4, in a further embodiment, such as... Figure 3 As shown, the capillary purge tube 7 is located inside the evaporation flask 4 and is connected to a flow divider 702. The flow divider 702 has a plurality of purge holes 703 evenly distributed along its circumference on its side.

[0028] Finally, it should be noted that 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 or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rotary evaporator comprising a base (1), a support (2) and a bath pan (3) fixed on the base (1), an evaporation flask (4) arranged in the bath pan (3), and an evaporation tube (401) provided on the evaporation flask (4), characterized in that, The bracket (2) is rotatably connected to a main shaft (5) and is provided with a power mechanism to drive the main shaft (5) to rotate. The main shaft (5) is sealed and detachably connected to the evaporator tube (401). A synchronous connection mechanism (6) is provided between the main shaft (5) and the evaporator tube (401). A capillary purge tube (7) is provided inside the main shaft (5) and is coaxial with it. One end of the capillary purge tube (7) extends into the evaporator flask (4), and the other end is connected to an inert purge gas bottle through a rotary joint (701). A flow guide sleeve (8) is rotatably and sealed connected to the evaporator tube (401). A branch pipe (402) communicating with the inside of the flow guide sleeve (8) is provided on the evaporator tube (401). An interface pipe (801) is provided on the flow guide sleeve (8) and connected to the condensation system.

2. A rotary evaporator according to claim 1, characterized in that The bathtub (3) has an external heat insulation layer (301) and an inlet pipe (302) and an outlet pipe (303).

3. A rotary evaporator according to claim 2, wherein The bathtub (3) has a cylindrical interior space, and the inlet pipe (302) is connected to it tangentially. The inlet pipe (302) is located at the bottom of the bathtub (3), and the outlet pipe (303) is located at the top of the bathtub (3).

4. A rotary evaporator according to claim 1, wherein The end of the main shaft (5) is fixedly provided with a sealing plug (501) that can extend into the evaporator tube (401) and is interference-fitted therewith. The synchronous connection mechanism (6) includes a positioning groove (611) provided on the end face of the main shaft (5) and a positioning protrusion (612) provided on the end face of the evaporator tube (401). The end of the main shaft (5) is rotatably connected with an internal threaded sleeve (621), and an external threaded sleeve (622) is fixedly provided on the evaporator tube (401).

5. A rotary evaporator according to claim 1, wherein The branch pipe (402) is provided in multiple parts and is evenly distributed around the evaporator pipe (401).

6. A rotary evaporator according to claim 1, wherein The evaporator tube (401) and the flow guide sleeve (8) are double-layer jacket structures with heat insulation effect.

7. A rotary evaporator according to claim 1, characterized in that, The capillary purge tube (7) is located inside the evaporation flask (4) and is connected to a splitter head (702). The side of the splitter head (702) is provided with a plurality of purge holes (703) evenly distributed along its circumference.

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