Novel rotary evaporator

Abstract

The utility model discloses a novel rotary evaporator, which belongs to the technical field of experimental equipment and comprises a water bath kettle, a fixed box arranged below the water bath kettle, a support frame, a motor, a four-way ball, a distillation bottle, a condensing device, a collecting bottle and a liquid adding valve, wherein the distillation bottle, the condensing device, the collecting bottle and the liquid adding valve are respectively communicated with the four-way ball; wherein an opening is formed in the upper portion of the fixed box, a vertical lifting barrel is arranged in the fixed box and located below the water bath kettle, a threaded rod rotationally connected with the bottom of the fixed box is arranged below the lifting barrel, the upper end of the threaded rod penetrates into the lifting barrel and is in threaded connection with the lifting barrel, and the bottom of the threaded rod is fixedly sleeved with a worm wheel; the threaded rod is connected with the driving piece through a worm gear; the technical problem that in the experiment process of an existing rotary evaporator, the water level in a water bath kettle drops, it cannot be guaranteed that a distillation flask is immersed in water, and therefore the heating evaporation efficiency of a solution in the distillation flask is reduced is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental equipment, in particular to a novel rotary evaporator. Background Art

[0002] Rotary evaporator, also known as rotary evaporator, is a commonly used laboratory equipment, consisting of a rotary motor, distillation flask, recovery bottle, water bath, condenser and other parts; it is mainly used for continuous distillation of volatile solvents under reduced pressure conditions, and is used in pharmaceutical research and development and pharmaceutical production, chemical industry, and colleges and universities' chemistry, pharmacy, materials engineering, biomolecules, food, disease control and other scientific research laboratories (concentration, extraction, drying, separation, crystallization) as an essential instrument.

[0003] The working principle of the rotary evaporator is to use a vacuum pump to put the distillation flask under vacuum conditions. The operator adds water to the water bath, then tilts the distillation flask and places it in the water bath. The distillation flask is controlled to rotate at a constant speed and heated at a constant temperature. The material in the distillation flask is diffused and evaporated by constant temperature heating. The solution in the distillation flask evaporates and turns into steam. The steam is transferred to the glass condenser through the air guide tube for cooling and is recovered in the collection bottle. When the solution in the distillation flask evaporates to a certain volume, the experiment stops.

[0004] During the experiment, the liquid in the distillation flask always needs to be immersed in the water in the water bath. However, the water in the water bath will evaporate as the heating time goes by, causing the water level in the water bath to drop, making it impossible to ensure that the distillation flask is immersed in water, thereby reducing the heating evaporation efficiency of the solution in the distillation flask. If the operator adds water to the water bath, the water temperature in the water bath will easily change, affecting the heating effect of the solution in the distillation flask and further affecting the results of the experiment. Utility Model Content

[0005] The utility model provides a novel rotary evaporator for solving the technical problem that during the experiment of the existing rotary evaporator, the water level in the water bath pot drops and the distillation flask cannot be immersed in water, thereby reducing the heating evaporation efficiency of the solution in the distillation flask.

[0006] In view of this, the utility model provides a novel rotary evaporator, comprising: a water bath, a fixed box arranged below the water bath, a support frame, a motor, a four-way ball, a distillation flask respectively connected to the four-way ball, a condensing device, a collecting flask and a liquid adding valve;

[0007] Among them, the fixed box has an opening at the top, and a vertical lifting cylinder is arranged inside the fixed box. The lifting cylinder is located below the water bath, and a threaded rod rotatably connected to the bottom of the fixed box is arranged below the lifting cylinder. The upper end of the threaded rod passes through the interior of the lifting cylinder and is threadedly connected to the lifting cylinder. A worm gear is arranged on the bottom fixed sleeve of the threaded rod, and the threaded rod is connected to the driving member through the worm gear.

[0008] Optionally, the driving member includes a worm and a motor which are arranged at the front side of the worm wheel and located at the bottom of the fixed box, the worm wheel is meshingly connected to the worm, and the output shaft of the motor is fixedly connected to the worm.

[0009] Optionally, a clamping frame is provided at the bottom of the collecting bottle, the clamping frame is fixedly connected to the supporting frame, and a rubber pad is provided on the clamping frame.

[0010] Optionally, it also includes fixing parts arranged on both sides of the fixed box, the fixing parts include a fixing seat arranged on the side wall of the fixed box, a channel is arranged in the fixing seat, a horizontal sliding rod is arranged in the channel, one end of the sliding rod extends into the fixed box and abuts against the water bath pot through the fixed block, and the other end of the sliding rod is provided with a vertical limit plate that moves along the inner wall of the channel, a screw is arranged on the outside of the channel, the screw is threadedly connected to the fixing seat, a spring is arranged in the channel, and the spring is sleeved on the outside of the sliding rod.

[0011] Optionally, a rubber pad is provided on one side of the fixing block away from the sliding rod.

[0012] Optionally, handles are provided at the top outer edges of both sides of the water bath.

[0013] It can be seen from the above technical scheme that the new rotary evaporator of the utility model has the following advantages:

[0014] The utility model provides a novel rotary evaporator, which is equipped with a motor, a worm, a worm wheel, a threaded rod and a lifting cylinder. When the motor rotates, the worm, the worm wheel and the threaded rod are driven to rotate in sequence, so that the lifting cylinder is lifted and lowered on the threaded rod, thereby adjusting the height of a water bath pot on the top of the lifting cylinder, and further adjusting the height of the liquid level in the water bath pot and the liquid level in a distillation flask, ensuring that the lower part of the distillation flask can be immersed in the water in the water bath pot, thereby preventing the water level in the water bath pot from dropping and affecting the experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a novel rotary evaporator provided in an embodiment of the utility model;

[0016] Figure 2 A cross-sectional view of the internal structure of the fixed box provided in an embodiment of the utility model;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of the structure at center A;

[0018] Figure 4 It is a top view of the worm gear connection provided in the utility model.

[0019] Wherein, the accompanying drawings are marked as follows:

[0020] 1. Water bath; 11. Handle;

[0021] 2. Fixed box; 21. Lifting cylinder; 22. Threaded rod; 23. Worm gear; 24. Worm; 25. Motor;

[0022] 31. Fixed seat; 32. Channel; 33. Sliding rod; 34. Fixed block; 35. Limiting plate; 36. Screw; 37. Spring;

[0023] 4. Support frame; 5. Motor; 6. Four-way ball; 7. Distillation flask; 8. Condensation device; 9. Collecting bottle; 91. Clamping frame; 10. Liquid filling valve. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in the technical field better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model. In the description of the embodiment of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiment of the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiment of the utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0026] For easier understanding, see Figure 1 The utility model provides an embodiment of a novel rotary evaporator, comprising: a water bath 1, a fixed box 2 arranged below the water bath 1, a support frame 4, a motor 5 placed on the support frame 4, a four-way ball 6, a distillation flask 7 respectively connected to the four-way ball 6, a condensation device 8, a collecting bottle 9 and a liquid adding valve 10;

[0027] See also Figure 2and Figure 4 , wherein the fixed box 2 has an opening at the top, and a vertical lifting cylinder 21 is arranged inside the fixed box 2. The lifting cylinder 21 is located below the water bath 1, and the lifting cylinder 21 can lift the water bath 1. A rubber layer is arranged on the top surface of the lifting cylinder 21 to increase the friction between the lifting cylinder 21 and the water bath 1. A threaded rod 22 rotatably connected to the bottom of the fixed box 2 is arranged below the lifting cylinder 21. The upper end of the threaded rod 22 penetrates into the interior of the lifting cylinder 21 and is threadedly connected to the lifting cylinder 21. A worm gear 23 is arranged on the bottom fixed sleeve of the threaded rod 22, and the threaded rod 22 is connected to the driving member through the worm gear 23; under the driving action of the driving member, the driving worm gear 23 can drive the threaded rod 22 connected thereto to rotate together, thereby driving the lifting cylinder 21 to be lifted and lowered;

[0028] The driving member includes a worm 24 disposed at the front side of the worm wheel 23 and located at the bottom of the fixed box 2. The worm wheel 23 is meshed with the worm 24. A motor 25 is disposed at the bottom of the outer side of the fixed box 2. The output shaft of the motor 25 is coaxially arranged with the worm 24. The output shaft of the motor 25 penetrates into the interior of the fixed box 2 and is fixedly connected with the worm 24.

[0029] Specifically, the motor 25 is controlled to rotate, and the rotation of the motor 25 will drive the worm 24 connected thereto to rotate, and then drive the worm wheel 23 connected to the worm 24 to rotate. Since the threaded rod 22 is sleeved on the central axis of the worm wheel 23 and is fixedly connected thereto, and the bottom end of the threaded rod 22 is rotationally connected to the fixed box 2, the threaded rod 22 and the worm wheel 23 rotate in the same direction; when the worm wheel 23 and the threaded rod 22 rotate clockwise or counterclockwise, since the lifting cylinder 21 is threadedly connected to the threaded rod 22, the lifting cylinder 21 is continuously screwed out or screwed in along the threaded rod 22, so that the lifting cylinder 21 rises or falls, and then drives the water bath 1 on the top of the lifting cylinder 21 to rise or fall, so as to adjust the height of the water bath 1;

[0030] During the experiment, if the water level in the water bath 1 drops, the lifting cylinder 21 can be raised, and the water bath 1 rises accordingly, to ensure that when the distillation flask 7 is immersed in the water in the water bath 1 again, the control motor 25 stops rotating and the lifting cylinder 21 stops rising; at the same time, a limit block is provided at the top of the threaded rod 22 to prevent the lifting cylinder 21 from being screwed out of the threaded rod 22;

[0031] A clamping frame 91 is provided at the bottom of the collecting bottle 9, and the clamping frame 91 is fixedly connected to the support frame 4. The clamping frame 91 is composed of two semi-arc clamping rods, and the two semi-arc clamping rods are arranged opposite to each other to form a hugging shape, thereby clamping the bottom of the collecting bottle 9. A rubber pad is provided on the clamping rod for better clamping.

[0032] See also Figure 2 and Figure 3In order to facilitate the fixing of the water bath 1 during the experiment, it also includes fixing parts arranged on both sides of the fixing box 2, and the fixing parts include a fixing seat 31 arranged on the side wall of the fixing box 2, a channel 32 is arranged in the fixing seat 31, a horizontal sliding rod 33 is arranged in the channel 32, one end of the sliding rod 33 extends into the fixing box 2 and abuts against the water bath 1 through a fixing block 34, a rubber pad is arranged on one side of the fixing block 34 away from the sliding rod 33, and a vertical limit plate 35 moving along the inner wall of the channel 32 is arranged at the other end of the sliding rod 33, a screw 36 is arranged on the outside of the channel 32, and the screw 36 is threadedly connected to the fixing seat 31, a spring 37 is arranged in the channel 32, and the spring 37 is sleeved on the outside of the sliding rod 33;

[0033] After adjusting the position of the water bath 1, turn the screw 36 to make it continuously screwed into the fixing seat 31. Under the pushing action of the screw 36, the limit plate 35 moves along the inner wall of the fixing seat 31 toward the water bath 1, and drives the sliding rod 33 to move in the same direction. The spring 37 is squeezed and compressed in this process, and the fixing block 34 connected to the sliding rod 33 continuously approaches the water bath 1 until it abuts against and tightens the water bath 1. After the fixing blocks 34 of the fixing members on both sides are pressed against the water bath 1, the fixing members are fixed to the water bath 1.

[0034] A handle 11 is provided at the top outer edge extension of both sides of the water bath 1. A groove is provided on the side of the handle 11. The fingers are placed in the groove to facilitate taking the water bath 1. When the water bath 1 is lowered until the bottom of the handle 11 contacts the top surface of the fixing box 2, the water bath 1 can be supported.

[0035] It should be noted that the angle between the distillation flask 7 and the water bath 1 is adjustable. This is disclosed in the prior art and the existing technology can be used without further elaboration. Therefore, the angle of the distillation flask 7 is adjusted before the experiment to ensure that the edge of the water bath 1 does not collide with the distillation flask 7 when the water bath 1 is raised and lowered.

[0036] The specific working process of the utility model is as follows: the rotary evaporator is used together with the vacuum pump, first the water bath 1 is placed on the top of the lifting cylinder 21, at this time the bottom of the handle 11 is against the top of the fixed box 2, then the distillation flask 7 and the collecting bottle 9 are installed, and the vacuum pump and the evaporator are connected; turn on the vacuum pump to ensure that a negative pressure environment is formed inside the evaporator, then open the liquid adding valve 10, use the negative pressure condition to deliver the material into the distillation flask 7, turn on the condensing device 8, and then add water to the water bath 1 to make the liquid height of the material equal to the liquid height in the water bath 1, then turn the screw 36 in the fixing part, the screw 36 is screwed inward, driving the fixing seat 31 connected to the sliding rod 33 to move in the direction close to the water bath 1, until the fixing block 34 is pressed against the water bath 1, stop turning the screw 36, and the fixing part is fixed. The water bath 1 is fixed by the parts; after turning on the water bath 1 and setting the corresponding temperature, the water bath 1 begins to heat, and finally the motor 5 is turned on to give the distillation flask 7 an appropriate speed, and the rotary evaporator begins to evaporate. Through the heating of the water bath 1, the re-condensed liquid is collected in the collecting bottle 9; after the water level in the water bath 1 drops, the liquid level in the distillation flask 7 is not flush with the liquid level of the water bath 1, at this time, the screw 36 is rotated in the opposite direction to make the screw 36 screwed outward, and the fixing block 34 releases the fixation of the water bath 1, and then the motor 25 is driven to rotate, which in turn drives the worm 24, the worm wheel 23, and the threaded rod 22 to rotate, and the lifting cylinder 21 rises, driving the water bath 1 to rise synchronously, so that the water level in the water bath 1 is flush with the liquid level of the distillation flask 7 again, ensuring that the lower part of the distillation flask 7 is immersed in the water in the water bath 1.

[0037] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A novel rotary evaporator, comprising: A water bath (1), a support frame (4), a motor (5), a four-way ball (6), and a distillation flask (7), a condensation device (8), a collecting flask (9), and a liquid adding valve (10) respectively connected to the four-way ball (6); The invention is characterized in that it further comprises a fixed box (2) arranged below the water bath (1), the top of the fixed box (2) is open, a vertical lifting cylinder (21) is arranged inside the fixed box (2), the lifting cylinder (21) is located below the water bath (1), a rubber layer is arranged on the top surface of the lifting cylinder (21) to increase the friction between the lifting cylinder (21) and the water bath (1), a threaded rod (22) is arranged below the lifting cylinder (21) and is rotatably connected to the bottom of the fixed box (2), the upper end of the threaded rod (22) passes through the inside of the lifting cylinder (21) and is threadedly connected to the lifting cylinder (21), a worm gear (23) is arranged on the bottom fixed sleeve of the threaded rod (22), and the threaded rod (22) is connected to a driving member via the worm gear (23).

2. A novel rotary evaporator according to claim 1, characterized in that, The driving member comprises a worm (24) and a motor (25) which are arranged at the front side of the worm wheel (23) and located at the bottom of the fixed box (2); the worm wheel (23) is meshingly connected with the worm (24); and the output shaft of the motor (25) is fixedly connected with the worm (24).

3. A novel rotary evaporator according to claim 1, characterized in that, A clamping frame (91) is provided at the bottom of the collecting bottle (9), the clamping frame (91) is fixedly connected to the support frame (4), and a rubber pad is provided on the clamping frame (91).

4. A novel rotary evaporator according to claim 1, characterized in that, The fixing box (2) further comprises fixing members arranged on both sides of the fixing box (2), the fixing members comprising a fixing seat (31) arranged on the side wall of the fixing box (2), a channel (32) being arranged in the fixing seat (31), a horizontal sliding rod (33) being arranged in the channel (32), one end of the sliding rod (33) extending into the fixing box (2) and abutting against the water bath (1) through a fixing block (34), the other end of the sliding rod (33) being provided with a vertical limiting plate (35) moving along the inner wall of the channel (32), a screw (36) being arranged on the outside of the channel (32), the screw (36) being threadedly connected to the fixing seat (31), a spring (37) being arranged in the channel (32), the spring (37) being sleeved on the outside of the sliding rod (33).

5. A novel rotary evaporator according to claim 4, characterized in that: A rubber pad is provided on one side of the fixing block (34) away from the sliding rod (33).

6. A novel rotary evaporator according to claim 1, characterized in that: Handles (11) are provided at the extensions of the top outer edges of both sides of the water bath pot (1).

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