Rotary evaporator

Abstract

The utility model relates to the field of distillation separation, and provides a rotary evaporator which comprises a rack, a rotary motor, a rotary bottle and a sealing plug, the rotary motor is arranged on the rack, the rotary bottle is connected with the rotary motor through a bottle opening, and the sealing plug is arranged in a bottle neck of the rotary bottle. The connecting part of the sealing plug penetrates through the bottle neck to enter the bottle body of the rotary bottle, a blind hole is formed in the top of the sealing plug, a filtering hole is formed in the side face of the connecting part and communicated with the blind hole, and the rotary motor drives the rotary bottle to rotate. In the operation process of the rotary evaporator, floccules generated by the rotary evaporator can be prevented from entering a subsequent process.

Description

Technical Field

[0001] The utility model relates to the field of distillation separation, in particular to a rotary evaporator. Background Art

[0002] Rotary evaporators are mainly used to distill and separate organic solvents and extract the final product from them. However, when evaporating certain organic solvents, flocculent products will be produced, and these products need to be properly retained in the rotary bottle of the rotary evaporator. But the problem is that due to the fine particles of the flocculent products and the fact that the rotary evaporator uses reduced pressure evaporation technology to reduce the boiling point of the solvent, these products are easily pumped into the condenser under negative pressure.

[0003] To prevent the loss of flocs, operators currently generally fill the neck of the rotating bottle with cotton. However, this approach has two major drawbacks: first, cotton cannot be recycled, and each evaporation process consumes a certain amount of cotton, increasing costs; at the same time, cotton will absorb some flocs during the isolation process, making subsequent separation difficult. Second, cotton tends to shrink after absorbing water vapor or organic solvents, and may fall off during the continuous movement of the rotating bottle, thereby contaminating the material and affecting the accuracy of the results. Utility Model Content

[0004] The technical problem to be solved by the utility model is to solve at least one of the technical problems mentioned above.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A rotary evaporator comprises a frame, a rotary motor, a rotary bottle and a sealing plug, wherein the rotary motor is arranged on the frame, the sealing plug is arranged in the bottleneck of the rotary bottle, the connecting part of the sealing plug passes through the bottleneck of the rotary bottle and enters into the bottle body of the rotary bottle, a blind hole is opened on the top of the sealing plug, a filter hole is opened on the side of the connecting part of the sealing plug, the filter hole is connected with the blind hole, and the rotary motor drives the rotary bottle to rotate.

[0007] As a further improvement of the above technical solution, the inner diameter of the bottleneck of the rotating bottle is a, and a connecting sleeve is provided above the rotating bottle, the inner diameter of the connecting sleeve is b, and a is smaller than b. A first flange extends outward from the top of the bottleneck of the rotating bottle, and the lower end of the connecting sleeve is fixedly connected to the first flange, so that the inner wall of the connecting sleeve, the top surface of the first flange, and the top surface and inner wall of the bottleneck of the rotating bottle form a step.

[0008] As a further improvement of the above technical solution, a second flange extends outward from the top of the sealing plug, the outer diameter of the second flange is larger than the inner diameter of the bottleneck of the rotating bottle, and the second flange abuts against the first flange.

[0009] As a further improvement of the above technical solution, a protruding block is provided on the top surface of the first flange, and a notch for avoiding the protruding block is formed on the outer side surface of the second flange along the inner diameter direction.

[0010] As a further improvement of the above technical solution, a filter screen is provided on the connecting portion of the sealing plug, and the filter screen covers the filter hole.

[0011] As a further improvement of the above technical solution, the rotary evaporator also includes a connecting frame, a sealing block and a spring, the sealing block is arranged in the blind hole, the spring is arranged between the sealing block and the sealing end of the blind hole, the two ends of the spring are respectively fixedly connected to the sealing end of the blind hole and one end of the sealing block, one end of the connecting frame is fixedly connected to the other end of the sealing block, the other end of the connecting frame extends out of the blind hole, and the sealing block is used to block or open the filter hole.

[0012] As a further improvement of the above technical solution, a through hole is opened in the middle of one end surface of the sealing block, and the through hole extends along the depth direction of the rotating bottle.

[0013] As a further improvement of the above technical solution, the sealing plug is provided with a vertical slide groove, the slide groove is arranged on the inner wall of the blind hole, the slide groove extends to the opening end of the blind hole, the connecting frame is provided with a raised rib, the raised rib is inserted into the slide groove, and the raised rib and the slide groove can slide relative to each other.

[0014] As a further improvement of the above technical solution, the inner side surface of the connecting sleeve is provided with a frosted layer, the rotating motor is plugged into the inner side of the connecting sleeve, and the rotating motor drives the rotating bottle to rotate through the static friction between the rotating motor and the frosted layer.

[0015] As a further improvement of the above technical solution, the rotary evaporator also includes a lifting device and a water bath, the lifting device is arranged on the frame, the rotary motor is arranged on the lifting device, the water bath is arranged on the frame, and the water bath is arranged below the rotating bottle. The lifting device drives the rotary motor to move up and down, so that the rotating bottle on the rotary motor can enter the water bath.

[0016] The beneficial effect of the utility model is that the rotary motor is arranged on the frame, and when the rotary evaporator is in operation, the rotary motor drives the rotary bottle to rotate. The sealing plug is inserted into the mouth of the rotary bottle to ensure that the lower end of the sealing plug penetrates into the interior of the bottle body, and this penetrating part is called the connecting part. The filter hole leading to the blind hole is cleverly designed on the side of the connecting part. This design not only builds a smooth bridge between the internal and external environments of the rotary bottle, but also enables the steam in the bottle to smoothly pass through the filter hole into the blind hole during the rotary evaporation process, and then smoothly transmit downstream. It is particularly worth mentioning that the setting of the filter hole effectively blocks the escape of flocs, significantly reduces its loss during the evaporation process, and ensures the stability and purity of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axonometric view of a rotary evaporator according to one embodiment of the present utility model.

[0018] Figure 2 It is a front view of a rotating bottle according to an embodiment of the present utility model.

[0019] Figure 3 The utility model Figure 2 Axonometric section view at AA in the figure.

[0020] Figure 4 The utility model Figure 2 Axonometric section view at BB in the figure.

[0021] Figure 5 The utility model Figure 2 Left side view of the rotating bottle.

[0022] Figure 6 The utility model Figure 5 Axonometric section view at CC in .

[0023] Figure 7 It is an exploded schematic diagram of a rotating bottle, a synchronous belt, a first connecting pipe, a second connecting pipe, a first pulley and a second pulley in one embodiment of the utility model.

[0024] In the accompanying drawings: 1-rotating bottle, 11-connecting sleeve, 12-first flange, 121-raised block, 2-sealing plug, 21-second flange, 22-slide groove, 3-blind hole, 4-filter hole, 5-connecting frame, 51-raised rib, 6-sealing block, 61-through hole, 7-spring, 8-rotating motor, 81-first connecting pipe, 82-second connecting pipe, 83-synchronous belt, 84-frame body, 85-first pulley, 86-second pulley, 9-condenser, 10-water bath. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the above briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of them. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0026] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the utility model can be combined interchangeably without conflicting with each other.

[0027] Reference Figures 1 to 7 A rotary evaporator comprises a frame, a rotary motor 8, a rotary bottle 1 and a sealing plug 2, wherein the rotary motor 8 is arranged on the frame, the rotary bottle 1 is connected to the rotary motor 8 through the bottle mouth, the sealing plug 2 is arranged in the bottleneck of the rotary bottle 1, the connecting part of the sealing plug 2 passes through the bottleneck and enters into the bottle body of the rotary bottle 1, a blind hole 3 is opened on the top of the sealing plug 2, a filter hole 4 is opened on the side of the connecting part, the filter hole 4 is connected to the blind hole 3, and the rotary motor 8 drives the rotary bottle 1 to rotate.

[0028] In the art, the rotary bottle 1 in the rotary evaporator is a flask. The flask usually has a round belly and a thin neck, and its mouth is narrow, which is used to prevent the solution from splashing or reduce the evaporation of the solution. The thin neck part of the flask is generally called the bottleneck, and the round belly part of the flask is generally called the bottle body.

[0029] As can be seen from the above, the rotary motor 8 is arranged on the frame. When the rotary evaporator is in operation, the rotary motor 8 drives the rotary bottle 1 to rotate. The sealing plug 2 is inserted into the mouth of the rotary bottle 1 to ensure that the lower end of the sealing plug 2 penetrates into the bottle body. This penetrating part is called the connecting part. A filter hole 4 leading to the blind hole 3 is provided on the side of the connecting part. This design realizes the direct connection between the internal and external environments of the rotary bottle 1. During the rotary evaporation process, the steam in the bottle can enter the blind hole 3 through the filter hole 4 without hindrance. Importantly, the filter hole 4 effectively prevents the leakage of floccules, greatly reduces the material loss during the evaporation process, and ensures the reliability of the process and the purity of the product.

[0030] In order to facilitate installation and connection, in one embodiment, the inner diameter of the bottleneck of the rotating bottle 1 is a, and a connecting sleeve 11 is provided above the rotating bottle 1, and the inner diameter of the connecting sleeve 11 is b, a is smaller than b, and the top of the bottleneck of the rotating bottle 1 extends outwardly from the first flange 12, and the lower end of the connecting sleeve 11 is fixedly connected to the first flange 12, so that the inner wall of the connecting sleeve 11, the top surface of the first flange 12, and the top surface and inner wall of the bottleneck of the rotating bottle 1 form a step. During use, the connecting sleeve 11 and the first flange 12 can be used to connect the rotary motor 8 of the rotary evaporator. When connected, the first flange 12 can position and limit the rotary motor 8 of the rotary evaporator.

[0031] In order to achieve communication between the condenser 9 and the rotating bottle 1, the rotating motor 8 includes a motor body (not shown in the accompanying drawings), a first connecting pipe 81 and a synchronous belt 83. The frame includes a frame body 84 and a second connecting pipe 82. The second connecting pipe 82 is arranged on the frame body 84, and one end of the second connecting pipe 82 is connected to the condenser 9. The fixed part of the motor body is installed on the frame body 84. The first connecting pipe 81 is arranged on the frame body 84. The first connecting pipe 81 and the frame body 84 are relatively rotatably connected. The motor body drives the first connecting pipe 81 to rotate through the synchronous belt 83. When in use, the connecting sleeve 11 on the rotary evaporator is used to dock with one end of the first connecting pipe 81, and the other end of the first connecting pipe 81 is connected to the other end of the second connecting pipe 82.

[0032] Furthermore, the first connecting tube 81 is provided with a first pulley 85 which is coaxially driven with the first connecting tube 81 , and the output end of the motor body drives the second pulley 86 to rotate, and the first pulley 85 and the second pulley 86 are connected through the synchronous belt 83 .

[0033] When in use, the gas generated by evaporation in the rotating bottle 1 enters the first connecting pipe 81 through the bottle mouth of the rotating bottle 1, then enters the second connecting pipe 82, and finally enters the condenser 9 from the second connecting pipe 82.

[0034] In order to prevent the sealing plug 2 from being inserted too deeply into the bottle body of the rotating bottle 1 and causing the sealing plug 2 to be difficult to pull out, in one embodiment, a second flange 21 is extended outward from the top of the sealing plug 2, and the outer diameter of the second flange 21 is greater than the inner diameter of the bottleneck of the rotating bottle 1, and the second flange 21 abuts against the first flange 12. This design realizes the physical restriction of the insertion depth of the sealing plug 2 by setting a second flange 21 extending outward at the top of the sealing plug 2, and utilizing the characteristic that the outer diameter of the second flange 21 is greater than the inner diameter of the bottleneck of the rotating bottle 1. When the sealing plug 2 is inserted into the bottleneck of the rotating bottle 1, as the insertion depth increases, the second flange 21 will gradually approach and eventually abut against the first flange 12 at the bottleneck of the rotating bottle 1. This design prevents the sealing plug 2 from continuing to penetrate into the interior of the rotating bottle 1, thereby avoiding the problem of being difficult to pull out due to excessive insertion. Therefore, by the abutment between the first flange 12 and the second flange 21, the depth of the sealing plug 2 inserted into the rotating bottle 1 can be effectively limited.

[0035] In order to facilitate the rapid installation of the sealing plug 2 on the one hand, and to facilitate the removal of the sealing plug 2 on the other hand, in one embodiment, a protruding block 121 is provided on the top surface of the first flange 12, and a notch for avoiding the protruding block 121 is provided on the outer side surface of the second flange 21 along the inner diameter direction. When it is necessary to install, the notch on the second flange 21 is aligned with the protruding block 121 for installation, so as to quickly determine the installation angle of the sealing plug 2; when it is necessary to remove the sealing plug 2, the user can use a tool to pry the sealing plug 2 at the notch, or the protruding block 121 and the top surface of the first flange 12 are in a smooth transition, and the user drives the sealing plug 2 to rotate and use the protruding block 121 to lift the sealing plug 2. In other words, in order to achieve rapid installation and removal of the sealing plug 2, a protruding block 121 is added to the top surface of the first flange 12 as a positioning point during installation; at the same time, a notch matching the shape of the protruding block 121 is chiseled on the outer side surface of the second flange 21 along the inner diameter direction, so that the protruding block 121 can be embedded during installation. This design ensures that during installation, the installation angle of the sealing plug 2 can be quickly and accurately determined through the precise docking of the notch and the protruding block 121, thereby simplifying the installation process. During the disassembly process, the user can either use a tool to apply force at the notch to pry the sealing plug 2, or rotate the sealing plug 2 and use the smooth transition design between the protruding block 121 and the top surface of the first flange 12 to use the protruding block 121 as a lever point to lift the sealing plug 2, thereby achieving easy disassembly.

[0036] In order to further improve the filtering effect of the filter hole 4, in one embodiment, a filter screen is provided on the connection portion of the sealing plug, and the filter screen covers the filter hole 4. Preferably, the filter screen is arranged in the filter hole 4, that is, the filter screen is arranged within the depth range of the filter hole 4. Of course, the filter screen can also be arranged at either end of the filter hole 4. By arranging the filter screen on the connection portion, especially placing the filter screen directly within the depth range of the filter hole 4 or at either end of the two ends, the filtering effect at the filter hole 4 is significantly enhanced. This design can effectively prevent larger particles or impurities from entering the filter hole 4, extend the service life of the subsequent sealing plug 2, and improve the overall filtering efficiency and cleanliness. At the same time, the setting of the filter screen is also convenient for maintenance and replacement. When the filter screen is blocked or damaged, it can be quickly replaced without affecting the normal operation of the equipment. The principle of this technical solution is based on the principle of physical filtration. As a porous material, the filter screen can allow small molecules or tiny particles in a fluid (such as gas, liquid) to pass through, while intercepting larger solid particles, impurities or suspended matter. When the fluid passes through the filter hole 4, it first passes through the filter screen, and the large particles are blocked outside the filter screen, while the clean fluid continues to pass through the filter hole 4 and enters the subsequent processing flow. This mechanical screening effect is simple and effective.

[0037] After completing the evaporation, it is necessary to pull out the rotary bottle 1 on the rotary evaporator. Since the rotary evaporator generally evaporates under negative pressure, and at the same time, after the rotary bottle 1 is further naturally cooled, it is easy for the external air to quickly enter the rotary bottle 1 during the process of pulling out the rotary bottle 1, and some liquid condensed in the rotary evaporator pipeline may be brought into the rotary bottle 1. For this reason, in one embodiment, the rotary evaporator also includes a connecting frame 5, a sealing block 6 and a spring 7. The sealing block 6 is arranged in the blind hole 3, and the spring 7 is arranged between the sealing block 6 and the closed end of the blind hole 3. The two ends of the spring 7 are respectively fixedly connected to the closed end of the blind hole 3 and one end of the sealing block 6, one end of the connecting frame 5 is fixedly connected to the other end of the sealing block 6, and the other end of the connecting frame 5 extends out of the blind hole 3. The sealing block 6 is used to block or open the filter hole 4. In the process of inserting the rotary motor 8 in the rotary evaporator into the connecting sleeve 11, the rotary motor 8 moves against the connecting frame 5 toward the bottle body of the rotary bottle 1, so that the spring 7 is compressed until the rotary motor 8 abuts against the second flange 21 or the first flange 12. At this time, the sealing block 6 does not block the filter hole 4. After insertion, the static friction generated between the connecting sleeve 11 and the rotary motor 8 is used to maintain the fixation between the rotary motor 8 and the rotary bottle 1. When the rotary evaporation process is completed, the user pulls out the rotary bottle 1 on the rotary motor 8, and the spring 7 resets and moves to make the sealing block 6 block the filter hole 4. In other words, during the evaporation process, the rotary motor 8 drives the rotary bottle 1 to rotate to increase the surface area of ​​the solvent, thereby improving the evaporation efficiency. After the evaporation is completed, in order to prevent the external air from quickly entering the rotary bottle 1 and possibly bringing the liquid condensed in the pipeline into the rotary bottle 1, the rotary evaporator is designed with a special sealing mechanism. The mechanism includes a connecting frame 5, a sealing block 6 and a spring 7. The sealing block 6 is located in the blind hole 3, the spring 7 is located between the sealing block 6 and the closed end of the blind hole 3, and the two ends of the spring 7 are fixedly connected to the closed end of the blind hole 3 and one end of the sealing block 6 respectively. One end of the connecting frame 5 is fixedly connected to the other end of the sealing block 6, and the other end of the connecting frame 5 extends out of the blind hole 3. The sealing block 6 is used to block or open the filter hole 4. When the rotary motor 8 is inserted into the connecting sleeve 11, the compression and static friction of the spring 7 maintain the fixation between the rotary motor 8 and the rotary bottle 1. After the evaporation is completed, when the rotary motor 8 is pulled out, the spring 7 is reset, and the sealing block 6 blocks the filter hole 4, thereby preventing the outside air from entering.

[0038] In combination with certain embodiments, the rotary motor 8 is inserted into the connecting sleeve 11 , which can be understood as the first connecting pipe 81 is inserted into the connecting sleeve 11 .

[0039] This design ensures that after the rotary evaporator completes the evaporation work, it can effectively prevent external air and pollutants from entering the rotary bottle 1, thereby protecting the purity and accuracy of the experiment. Through the reset mechanism of the spring 7, the sealing block 6 can automatically block the filter hole 4, avoiding the phenomenon of liquid back suction caused by rapid pressure changes, thereby improving the safety and reliability of the experiment. In addition, this design simplifies the operating process, making it more convenient and quick for users to replace the rotary bottle 1.

[0040] On the one hand, in order to reduce the material cost of the sealing block 6, and on the other hand, in order to leave a deformable space on the sealing block 6, in one embodiment, a through hole 61 is provided in the middle of the end face of the sealing block 6. The through hole 61 extends along the depth direction of the rotating bottle 1. The structure is simple and convenient to set up. The through hole 61 is provided in the middle of the end face of the sealing block 6, and its purpose is to reduce the material cost of the sealing block 6. By removing material from the central part of the sealing block 6 to form the through hole 61, the amount of material required is reduced, thereby reducing the cost. In addition, the presence of the through hole 61 provides a deformable space for the sealing block 6, which means that when subjected to pressure or external force, the sealing block 6 can be deformed to a certain extent to adapt to different working conditions or compensate for dimensional errors, thereby maintaining a good sealing effect.

[0041] In order to guide the connecting frame 5, in one embodiment, a vertical slide groove 22 is provided on the sealing plug 2, and the slide groove 22 is arranged on the inner wall of the blind hole 3, and the slide groove 22 extends to the open end of the blind hole 3. A protruding rib 51 is provided on the connecting frame 5, and the protruding rib 51 is inserted into the slide groove 22, and the protruding rib 51 and the slide groove 22 can slide relative to each other. The structure is simple and convenient to set up. By setting the protruding rib 51, the connecting frame 5 can be guided. In other words, in order to accurately guide the connecting frame 5, the vertical slide groove 22 is specially designed on the sealing plug 2 in this embodiment. This slide groove 22 is cleverly arranged on the inner wall of the blind hole 3 and extends to the open end of the blind hole 3, forming a continuous guide channel. At the same time, the connecting frame 5 is provided with a matching protruding rib 51, and these protruding ribs 51 are designed to be inserted into the slide groove 22 of the sealing plug 2. Through this design, the protruding rib 51 and the slide groove 22 can slide relative to each other, thereby realizing the guiding function of the connecting frame 5. This structure ensures the accuracy and stability of the operation. In addition, this structure reduces the possibility of position deviation of the connecting frame 5 caused by improper operation or error, thereby improving the reliability and durability of the overall system.

[0042] In order to realize that the rotary motor 8 can drive the rotary bottle 1 to rotate, reduce the relative rotation between the rotary motor 8 and the rotary bottle 1, and try to make the two rotate synchronously, in one embodiment, the inner diameter of the bottleneck of the rotary bottle 1 is a, and a connecting sleeve 11 is provided above the rotary bottle 1, and the inner diameter of the connecting sleeve 11 is b, a is smaller than b, and the top of the bottleneck of the rotary bottle 1 extends outwardly with a first flange 12, and the lower end of the connecting sleeve 11 is fixedly connected to the first flange 12, so that the inner wall of the connecting sleeve 11, the top surface of the first flange 12, and the top surface and inner wall of the bottleneck of the rotary bottle 1 form a step, and the inner side surface of the connecting sleeve 11 is provided with a frosted layer, and the rotary motor 8 is plugged into the inner side of the connecting sleeve 11, and the rotary motor 8 drives the rotary bottle 1 to rotate through the static friction between the frosted layer. By setting the frosted layer, the roughness of the surface can be effectively increased, thereby increasing the maximum static friction between the frosted layer and the rotary motor 8.

[0043] In order to facilitate the operator to adjust the temperature of the rotating bottle 1, in one embodiment, the rotary evaporator further includes a lifting device and a water bath 10, the lifting device is arranged on the frame, the rotary motor 8 is arranged on the lifting device, the water bath 10 is arranged on the frame, and the water bath 10 is arranged below the rotating bottle 1. The lifting device drives the rotating motor 8 to move up and down, so that the rotating bottle 1 on the rotating motor 8 can enter the water bath 10. When in use, the lifting device can drive the rotating motor 8 to move up and down, so that the rotating bottle 1 on the rotating motor 8 can be immersed in the liquid in the water bath 10, and the temperature of the rotating bottle 1 can be adjusted by adjusting the temperature of the liquid in the water bath 10.

[0044] The lifting device is a prior art, so it will not be described in detail. For example, the lifting device can be an electric screw, a worm gear mechanism, etc. It can achieve fine adjustment of the rotating motor 8 and the rotating bottle 1 to ensure that the rotating bottle 1 can accurately enter or leave the water bath 10. The installation position of the rotating motor 8 is on the lifting device, so that it can move with the lifting device to ensure that the rotating bottle 1 can rotate stably at any set height. The temperature control system of the water bath 10 usually includes a temperature sensor, a heater or a cooler, and these components work together to maintain the temperature of the liquid in the water bath 10 within a preset range.

[0045] The preferred implementation modes of the present invention are specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A rotary evaporator, comprising a frame, a rotary motor (8), a rotary bottle (1) and a sealing plug (2), wherein the rotary motor (8) is arranged on the frame, and characterized in that: The rotary evaporator further comprises a connecting frame (5), a sealing block (6) and a spring (7); the sealing plug (2) is arranged in the bottleneck of the rotary bottle (1); the connecting portion of the sealing plug (2) passes through the bottleneck of the rotary bottle (1) and enters into the bottle body of the rotary bottle (1); a blind hole (3) is provided at the top of the sealing plug (2); a filtering hole (4) is provided at the side of the connecting portion of the sealing plug (2); the filtering hole (4) is connected to the blind hole (3); the sealing block (6) is arranged in the blind hole (3); and the spring (7) is arranged on the sealing block (6). and the sealed end of the blind hole (3), two ends of the spring (7) are respectively fixedly connected to the sealed end of the blind hole (3) and one end of the sealing block (6), one end of the connecting frame (5) is fixedly connected to the other end of the sealing block (6), the other end of the connecting frame (5) extends out of the blind hole (3), the sealing block (6) is used to block or open the filter hole (4), the rotating motor (8) drives the rotating bottle (1) to rotate, and the rotating motor (8) presses against the connecting frame (5) in the direction of the bottle body of the rotating bottle (1) so that the spring (7) is compressed.

2. The rotary evaporator according to claim 1, characterized in that The inner diameter of the neck of the rotating bottle (1) is a, a connecting sleeve (11) is provided above the rotating bottle (1), the inner diameter of the connecting sleeve (11) is b, a is smaller than b, a first flange (12) extends outward from the top of the neck of the rotating bottle (1), the lower end of the connecting sleeve (11) is fixedly connected to the first flange (12), so that the inner wall of the connecting sleeve (11), the top surface of the first flange (12) and the top surface and inner wall of the neck of the rotating bottle (1) form a step.

3. The rotary evaporator according to claim 2, characterized in that A second flange (21) extends outward from the top of the sealing plug (2); the outer diameter of the second flange (21) is greater than the inner diameter of the bottleneck of the rotating bottle (1); and the second flange (21) abuts against the first flange (12).

4. The rotary evaporator according to claim 3, characterized in that A protruding block (121) is provided on the top surface of the first flange (12), and a notch is provided on the outer side surface of the second flange (21) along the inner diameter direction for avoiding the protruding block (121).

5. The rotary evaporator according to claim 1, characterized in that A filter screen is provided on the connection portion of the sealing plug (2), and the filter screen covers the filter hole (4).

6. The rotary evaporator according to claim 1, characterized in that A through hole (61) is provided in the middle of one end surface of the sealing block (6), and the through hole (61) extends along the depth direction of the rotating bottle (1).

7. The rotary evaporator according to claim 1, characterized in that The sealing plug (2) is provided with a vertical slide groove (22), the slide groove (22) is arranged on the inner wall of the blind hole (3), the slide groove (22) extends to the opening end of the blind hole (3), and the connecting frame (5) is provided with a protruding rib (51), the protruding rib (51) is inserted into the slide groove (22), and the protruding rib (51) and the slide groove (22) can slide relative to each other.

8. The rotary evaporator according to claim 2, characterized in that The inner side surface of the connecting sleeve (11) is provided with a frosted layer, the rotating motor (8) is plugged into the inner side of the connecting sleeve (11), and the rotating motor (8) drives the rotating bottle (1) to rotate through the static friction between the rotating motor (8) and the frosted layer.

9. The rotary evaporator according to claim 1, characterized in that The rotary evaporator further comprises a lifting device and a water bath (10), wherein the lifting device is arranged on the frame, the rotary motor (8) is arranged on the lifting device, the water bath (10) is arranged on the frame, and the water bath (10) is arranged below the rotary bottle (1). The lifting device drives the rotary motor (8) to move up and down, so that the rotary bottle (1) on the rotary motor (8) can enter the water bath (10).

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