Patent Description:
A rotary evaporator is extraction experiment equipment for performing reduced pressure distillation concentration on materials, is widely applied to experiments of scale concentration, drying, extraction recovery and the like of samples, and is especially used to fast distill a large amount of solvents. An existing rotary evaporator generally consists of assemblies such as a vacuum pumping device, a heating device, a condensing device, a rotating device, etc. The rotary evaporator has a main principle that through the control by electronic equipment, a flask rotates at the most suitable constant rotating speed to enable a solution to form a film, thus increasing the evaporation area. An evaporation flask is in a negative pressure state through a vacuum pump. The evaporation flask is placed in a water bath pot or an oil bath pot to be heated at a constant temperature while rotating. The heating temperature may be close to the boiling point of the solvent, so that the solution in the flask is heated and diffused at the negative pressure to be evaporated, and fast evaporation of the solvent is realized.

As for an existing common rotary evaporator (by taking RE-<NUM> manufactured by Shanghai Yarong Biochemical Instrument Factory as an example), the temperature of a heating pot, the rotating speed of a distillation flask and the height of the distillation flask in the water bath pot can be set in a use process, and an experimenter can accurately weigh the amount of feedstock before distillation. However, the amount of distillate in a collecting flask or the amount of concentrated liquid in the distillation flask corresponding to the distillation stopping time in a distillation process cannot be accurately determined, and usually depends on observation and feeling of an experimenter completely. In many cases, even if the distillation time is defined, since the time from the beginning of vacuum pumping of the distillation to the moment when the normal negative pressure level is reached through vacuum pumping each time is not exactly the same, and the sealing condition of rotary evaporator should be taken into account, the distillation stopping time point cannot be accurately determined by a simple method of defining the distillation time. Moreover, distillation flasks are generally in spherical shapes, for the liquid level height, even if a highly experienced experimenter draws a line on the flask to determine the distillation stopping time point, the distillation distillate of different samples still have an error of at least <NUM>, and this will seriously affect the judgement of a researcher doing reduced pressure distillation on the distillation end point. Especially, when the feedstock is different samples randomly collected in the natural world, various ingredient indexes of the feedstock, the distillate or the concentrated liquid need to be determined after the distillation experiment is completed, but the distillation yield of different samples, i.e., the ratio of the amount of concentrated liquid to the amount of the feedstock or the ratio of the amount of the distillate to the amount of the feedstock cannot be kept accurately consistent, so that distillation results of different samples cannot be compared. The experimenter often wants both high yield and good quality; however, the condition of high yield but low quality index of concentrated liquid or distillate, or low yield but high quality index of concentrated liquid or distillate often occurs in the practical work. These conditions cause higher judgement difficulty on the condition of more than one quality evaluation index. For the operation of the rotary evaporation, how to accurately realize quantitative control and liquid discharge of the distillate and quantitative control and liquid discharge of the concentrated liquid has important significance for comparing the quality of the concentrated liquid or the distillate of different distillation samples on the basis of ensuring the constant yield and the performance of the concentrated liquid or the distillate of the same sample at different concentration degrees.

Document <CIT> discloses an all-purpose distillation device capable of both continuous distillation and batch distillation easily and inexpensively by mounting an overflow tube and a pressure equalizing tube on the bottom flask of a boiling tower and performing atmospheric distillation or vacuum distillation utilizing the batch and continuous methods. Document <CIT> discloses a micro-concentration scale bottle includes an elliptical bottle body, a top end of the elliptical bottle body is provided with a charging port, and a bottom end of the elliptical bottle body is communicated with a transparent tube with scales.

The present invention provides a rotary evaporator capable of accurately quantifying distillate and concentrated liquid, and solves the problem about accurate quantitative control of the distillate and the concentrated liquid. The present invention adopts the technical solution according to the independent claim attached. Preferred embodiments of the invention are provided in dependent claims attached.

According to the rotary evaporator capable of accurately quantifying concentrated liquid of the present invention, the distillation flask is improved into a structure having a distillation flask liquid discharge opening formed at the bottom, and the concentrated liquid can be discharged without dismounting the distillation flask. In addition, a quantitative fine tube is disposed at the distillation flask liquid discharge opening, so that the constant subtle changes of the amount of the concentrated liquid can be intuitively observed. The first liquid discharge valve is closed immediately as soon as the amount of the concentrated liquid reaches the designed accurate amount, and the distillation is stopped simultaneously. The accurately quantified concentrated liquid can be accurately discharged to determine a distillation yield. Under the condition of consistent distillation yield, indexes for indicating the quality of the concentrated liquid, such as concentrated liquid ingredients, are determined to study and compare performance indexes of concentrated liquid of different distillation samples with the same yield and performance indexes of concentrated liquid of the same sample at different concentration degrees. At the same time, the rotary evaporator of the present invention replaces an existing water bath pot or oil bath pot with the electric heating belt as a heating assembly to heat the distillation flask. On one hand, the size of the rotary evaporator is greatly reduced, and water consumption and oil consumption for heating in the evaporation process are reduced. Additionally, the distillation flask can realize direct liquid discharge of the concentrated liquid, so that the whole rotary evaporator does not need an ascending and descending system and an angle regulating system. Assemblies of the whole rotary evaporator are reduced. The cost is reduced.

According to the rotary evaporator capable of accurately quantifying distillate of the present invention, an existing spherical collecting flask is improved into a structure having a liquid release opening at the bottom. The distillate can be discharged without dismounting the collecting flask. In addition, a metering tube is disposed at the liquid release opening, so that the constant subtle changes of the amount of the distillate can be intuitively observed. The first liquid release valve is closed immediately as soon as the distillate reaches the designed accurate amount, and the distillation is stopped simultaneously. The accurately quantified distillate can be accurately discharged to determine a distillation yield. Under the condition of consistent distillation yield, indexes indicating the quality of the distillate, such as each ingredient of the distillate, are determined to study and compare the distillate performance of different distillation samples with the same yield and the distillate performance differences of the same distillation sample at different distillation stages.

According to the rotary evaporator capable of accurately quantifying concentrated liquid and distillate of the present invention, the distillation flask and the collecting flask are further improved into structures respectively having the liquid discharge opening and the liquid release opening at the bottoms. The concentrated liquid can be discharged without dismounting the distillation flask. The distillate can be discharged without dismounting the collecting flask. At the same time, the quantitative tube is disposed at the liquid discharge opening, and the metering tube is disposed at the liquid release opening, so that the constant subtle changes of the amount of the concentrated liquid and the distillate can be intuitively observed. The first liquid discharge valve and (or) the first liquid release valve are (is) closed immediately as soon as the concentrated liquid and (or) the distillate reach (reaches) the designed accurate amount, and the distillation is stopped simultaneously. The accurately quantified concentrated liquid and (or) distillate can be accurately discharged to determine the distillation yield. Under the condition of consistent distillation yield, indexes such as ingredients of the concentrated liquid and (or) the distillate are determined to study and compare the performance of the concentrated liquid and the distillate of different distillation samples with the same yield and to study performance differences of the concentrated liquid and distillate of the same distillation sample at different concentration degrees. At the same time, the rotary evaporator of the present invention replaces an existing water (oil) bath pot with the heating belt as a heating assembly to heat the distillation flask. On one hand, the size of the rotary evaporator is greatly reduced, and water consumption and oil consumption for heating in the evaporation process are reduced. Additionally, the distillation flask can realize direct discharge of the concentrated liquid, so that the whole rotary evaporator does not need an ascending and descending system and an angle regulating system. Assemblies of the whole rotary evaporator are reduced. The cost is reduced.

In the <FIG> denotes a support frame; <NUM> denotes a distillation flask; <NUM> denotes a condenser; <NUM> denotes a collecting flask; <NUM> denotes a collecting flask liquid release opening; <NUM> denotes a first liquid release valve; <NUM> denotes a metering tube; <NUM> denotes a metering scale line; <NUM> denotes a second liquid release valve; <NUM> denotes a motor; <NUM> denotes a distillation flask liquid discharge opening; <NUM> denotes a first liquid discharge valve; <NUM> denotes a quantitative tube; <NUM> denotes a quantitative scale line; <NUM> denotes a second liquid discharge valve; <NUM> denotes an electric heating belt; <NUM> denotes a metering capacity increase unit; <NUM> denotes a quantitative capacity increase unit; <NUM> denotes a clamp; and <NUM> denotes a solution containing tray.

To make the objectives, features and advantages of the present invention more obvious and comprehensible, the present invention is further described in detail below with reference to the accompanying drawings and specific implementations.

As shown in <FIG>, a rotary evaporator capable of accurately quantifying concentrated liquid according to the present embodiment includes a support frame <NUM>. A detachable distillation flask <NUM> and a detachable condenser <NUM> are fixed on the support frame <NUM>. Liquid to be distilled is contained in the distillation flask <NUM> and is heated by a heating assembly to realize evaporation concentration. The bottom of the condenser <NUM> is connected to a collecting flask <NUM> configured to collect distillate. A motor <NUM> for controlling the distillation flask <NUM> to rotate (the rotary evaporator of the present invention may further be provided with a control panel for controlling a rotating speed of the distillation flask and a heating temperature, and the control panel is not shown in the figure), a control assembly for controlling the rotating speed and the heating temperature, a vacuum pumping assembly and the like, are further disposed on the support frame <NUM>.

According to the rotary evaporator as shown in <FIG>, a distillation flask liquid discharge opening <NUM> is formed at the bottom of the distillation flask <NUM> (subject to a work state position of the distillation flask <NUM>). The distillation flask liquid discharge opening <NUM> is formed in a liquid level bottom position of the distillation flask <NUM>, and is preferably formed in a lowest liquid level position of the distillation flask <NUM>. Additionally, a first liquid discharge valve <NUM> is further disposed at the distillation flask liquid discharge opening <NUM>, and is configured to perform liquid discharge control of the concentrated liquid and the sealing of the distillation flask <NUM>. The first liquid discharge valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

The rotary evaporator of the present embodiment further includes a concentrated liquid quantification assembly connected to the distillation flask liquid discharge opening <NUM>. The concentrated liquid quantification assembly can realize accurate quantitative control of the concentrated liquid. The concentrated liquid quantification assembly and the distillation flask liquid discharge opening <NUM> may be of an integrally formed structure or a structure connected in a sealed way through glass ground openings, and are fixed by a steel clamp <NUM> with a screw to maintain sealing performance of a system.

As shown in <FIG>, the concentrated liquid quantification assembly of the present embodiment is preferably a quantitative tube <NUM>. Quantitative scale lines <NUM> are provided on an outer wall of the quantitative tube <NUM>, and are configured to read an amount value of the concentrated liquid. A second liquid discharge valve <NUM> is disposed in a bottom position of the quantitative tube <NUM>, so as to control liquid discharge of the concentrated liquid and sealing. The quantitative tube <NUM> of the present embodiment is a metering fine tube with a cavity of a fine tubular structure, and its metering capacity is suitable to be a value in a range of <NUM> to <NUM>. Its metering scale is accurate to <NUM>, or even <NUM>. The second liquid discharge valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

As a transformable structure, according to the rotary evaporator as shown in <FIG>, a quantitative capacity increase unit <NUM> is further connected to a tail end (the end provided with the second liquid discharge valve <NUM>) of the quantitative tube <NUM> in a sealed way. The quantitative capacity increase unit <NUM> and the quantitative tube <NUM> are connected and sealed in a glass ground opening mode, and are fixed by a clamp. When the capacity of the quantitative tube <NUM> cannot meet the capacity requirement of the concentrated liquid, the quantifiable capacity of the concentrated liquid may be increased in a mode of adding the quantitative capacity increase unit <NUM>, and one-step liquid discharge of the required amount of concentrated liquid is realized on the basis. An error caused by the need of reading for many times when the liquid is discharged for many times is reduced. The metering accuracy of the concentrated liquid is favorably improved. The capacity increase of the quantitative tube <NUM> is realized through accurate metering cooperation of the quantitative capacity increase unit <NUM> and the quantitative tube <NUM>. The quantitative capacity increase units <NUM> of the present embodiment include a plurality of quantitative capacity increase units with different capacities, and are selected and replaced according to capacity requirements of the concentrated liquid. For example, the capacities of the quantitative capacity increase units <NUM> are designed into a plurality of values such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> to form one group. The proper quantitative capacity increase unit <NUM> is selected according to the required concentrated liquid capacity for one-step accurate liquid discharge of the concentrated liquid. A shape of the quantitative capacity increase unit <NUM> may select a suitable flat flask structure or a suitable bent tube connecting tube structure according to a distance from the distillation flask <NUM> to an operation platform, as long as a glass ground opening of the quantitative capacity increase unit <NUM> realizes matched sealing with a glass ground opening of the quantitative tube <NUM>. According to a structure as shown in <FIG>, as a preferable design, a certain capacity needs to be reserved outside a flask opening of the quantitative capacity increase unit <NUM>, so as to contain a solution flowing down from the quantitative tube <NUM>, and the objective is achieved by a solution containing tray <NUM> integrally formed with the quantitative capacity increase unit <NUM>.

In a structure of the rotary evaporator as shown in <FIG>, the heating assembly is configured to perform heating evaporation on the liquid to be distilled in the distillation flask <NUM>. In the present embodiment, the heating assembly is an electric heating belt <NUM> wound at an outer wall of the distillation flask <NUM>. The electric heating belt <NUM> performs heating evaporation on the liquid to be distilled in the distillation flask <NUM> through heat conduction of the flask wall of the distillation flask. Preferably, the electric heating belt <NUM> is annularly wound at the outer wall of the distillation flask <NUM>, so as to ensure heating uniformity. At the same time, a glass fiber belt is disposed outside the electric heating belt <NUM> and is used as a heat isolation material and a fixing layer to realize the heat isolation and fixation of the electric heating belt. A temperature controller sensor probe is further disposed between the electric heating belt <NUM> and the outer wall of the distillation flask <NUM>, and detects a heating temperature.

According to the rotary evaporator of the present embodiment, at the beginning of the distillation, the second liquid discharge valve <NUM> is closed, so that the inside of the distillation flask <NUM> still maintains a negative pressure state inside a distillation system. In a distillation process, the amount of the concentrated liquid is observed. The first liquid discharge valve <NUM> is closed immediately as soon as the amount of concentrated liquid reaches the designed accurate amount, and the distillation is stopped simultaneously. The determined amount of concentrated liquid is discharged after the second liquid discharge valve <NUM> is opened, is used to determine the index indicating the quality of the concentrated liquid, such as each ingredient of the concentrated liquid and calculate the yield index, and is further used to study performance differences of the concentrated liquids of the same distillation sample at different concentration degrees.

Referring to a structure shown in <FIG>, a rotary evaporator capable of accurately quantifying distillate according to the present embodiment includes a support frame <NUM>. A detachable distillation flask <NUM> and a detachable condenser <NUM> are fixed on the support frame <NUM>. Liquid to be distilled is contained in the distillation flask <NUM> and is heated to realize evaporation concentration by a heating assembly. The bottom of the condenser <NUM> is connected to a collecting flask <NUM> configured to collect the distillate. A motor <NUM> for controlling the distillation flask <NUM> to rotate (the rotary evaporator of the present invention may further be provided with a control panel for controlling a rotating speed and a heating temperature, and the control panel is not shown in the figure), an ascending and descending assembly for controlling the distillation flask <NUM> to ascend and descend, a control assembly for controlling the heating temperature and the like are further disposed on the support frame <NUM>. The heating assembly is a water (oil) bath pot disposed under the distillation flask <NUM> or an electric heating belt wound around the distillation flask <NUM>. The lower portion of the distillation flask <NUM> is in contact with heating liquid in the water bath pot, and the liquid to be distilled in the distillation flask <NUM> is heated.

According to the rotary evaporator as shown in <FIG>, a collecting flask liquid release opening <NUM> is formed at a bottom position of the collecting flask <NUM>, is formed at a liquid level bottom position of the collecting flask <NUM>, and is preferably formed at a lowest liquid level position of the collecting flask <NUM>. Additionally, a first liquid release valve <NUM> is further disposed at the collecting flask liquid release opening <NUM>, and is configured to perform liquid discharge control of the distillate and sealing. The first liquid release valve <NUM> of the collecting flask may be made from a glass material or a polytetrafluoroethylene material.

The rotary evaporator of the present embodiment further includes a distillate quantification assembly connected to the collecting flask liquid release opening <NUM>. The distillate quantification assembly can realize accurate quantitative control of the distillate. The distillate quantification assembly and the collecting flask liquid release opening <NUM> may be of an integrally formed structure or a structure connected in a sealed way through glass ground openings, and are fixed by a steel clamp with a screw to maintain sealing performance of a system.

According to the rotary evaporator as shown in <FIG>, the distillate quantification assembly of the present embodiment is preferably a metering tube <NUM> connected to the collecting flask liquid release opening <NUM> in a sealed way. Metering scale lines <NUM> are provided on an outer wall of the metering tube <NUM>, and are configured to accurately meter the distillate. A second liquid release valve <NUM> is disposed at a bottom position of the metering tube <NUM>, so as to control liquid discharge of the distillate and sealing. The metering tube <NUM> of the present embodiment is a metering fine tube with a cavity of a fine tubular structure, and its metering capacity is suitable to be a value in a range of <NUM> to10mL. Its metering scale is accurate to <NUM>, or even <NUM>. The second liquid release valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

As a transformable structure, according to the rotary evaporator as shown in <FIG>, a metering capacity increase unit <NUM> is further connected to a tail end (the end provided with the second liquid release valve <NUM>) of the metering tube <NUM> in a sealed way. The metering capacity increase unit <NUM> and the metering tube <NUM> are connected and sealed in a glass ground opening mode, and are fixed by a clamp. When the capacity of the metering tube <NUM> cannot meet the capacity requirement of the distillate, the measurable capacity of the distillate may be increased in a mode of adding the metering capacity increase unit <NUM>, and one-step liquid discharge of the required amount of distillate is realized on the basis. An error caused by the need of reading for many times when the liquid is discharged for many times is reduced. The metering accuracy of the distillate is favorably improved. The capacity increase of the metering tube <NUM> is realized through accurate metering cooperation of the metering capacity increase unit <NUM> and the metering tube <NUM>. The metering capacity increase units <NUM> of the present invention include a plurality of metering capacity increase units with different capacities, and are selected and replaced according to the capacities of the distillate. For example, the capacities of the metering capacity increase units <NUM> are designed into a plurality of values such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> to form one group. The proper metering capacity increase unit <NUM> is selected according to the required distillate capacity for one-step accurate liquid discharge. A shape of the metering capacity increase unit <NUM> may select a suitable flat flask structure or a bent tube connecting tube structure according to a distance from the collecting flask <NUM> to an operation platform, as long as the metering capacity increase unit <NUM> realizes matched sealing with a glass ground opening of the metering tube <NUM>. According to a structure as shown in <FIG>, as a preferable design, a certain capacity needs to be reserved outside a flask opening of the metering capacity increase unit <NUM> so as to contain a solution flowing down from the metering tube <NUM>, and the objective is achieved by a solution containing tray <NUM> integrally formed with the metering capacity increase unit <NUM>.

According to the rotary evaporator of the present embodiment, at the beginning of the distillation, the second liquid release valve <NUM> is closed, so that the inside of the collecting flask <NUM> still maintains a negative pressure state inside a distillation system. In a distillation process, the first liquid release valve <NUM> is closed immediately as soon as the observed amount of the distillate reaches the designed accurate amount, and the distillation is stopped simultaneously. The accurately quantified distillate is discharged after the second liquid release valve <NUM> is opened, and is used to determine the distillation yield and determine the index indicating the quality of the distillate, such as each ingredient of the distillate, and is further used to study performance differences of the distillate of the same distillation sample at different distillation stages.

As a transformable structure, according to a structure of the rotary evaporator as shown in <FIG>, a rotary evaporator capable of accurately quantifying concentrated liquid and (or) distillate according to the present embodiment includes a support frame <NUM>. A detachable distillation flask <NUM> and a detachable condenser <NUM> are fixed on the support frame <NUM>. Liquid to be distilled is contained in the distillation flask <NUM> and is heated to realize evaporation concentration by a heating assembly. The bottom of the condenser <NUM> is connected to a collecting flask <NUM> configured to collect distillate. A motor <NUM> for controlling the distillation flask <NUM> to rotate (the rotary evaporator of the present invention may further be provided with a control panel for controlling a rotating speed and a heating temperature, and the control panel is not shown in the figure), a control assembly for controlling the heating temperature and the like are further disposed on the support frame <NUM>.

According to the rotary evaporator as shown in <FIG>, a collecting flask liquid release opening <NUM> is formed at the bottom of the collecting flask <NUM>, is formed at a liquid level bottom position of the collecting flask <NUM>, and is preferably formed at a lowest liquid level position of the collecting flask <NUM>. Additionally, a first liquid release valve <NUM> is further disposed at the collecting flask liquid release opening <NUM>, and is configured to perform liquid discharge control of the distillate and sealing. The first liquid release valve <NUM> of the collecting flask may be made from a glass material or a polytetrafluoroethylene material.

According to the rotary evaporator as shown in <FIG>, the distillate quantification assembly of the present embodiment is a metering tube <NUM> connected to the collecting flask liquid release opening <NUM> in a sealed way. Metering scale lines <NUM> are provided on an outer wall of the metering tube <NUM>, and are configured to accurately meter the distillate. A second liquid release valve <NUM> is disposed at the bottom of the metering tube <NUM>, so as to control liquid discharge of the distillate and sealing. The metering tube <NUM> of the present embodiment is a metering fine tube with a cavity of a fine tubular structure, and its metering capacity is suitable to be a value in a range of <NUM> to <NUM>. Its metering scale is accurate to <NUM>, or even <NUM>. The second liquid release valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

As a transformable structure according to the rotary evaporator as shown in <FIG>, a metering capacity increase unit <NUM> is further connected to a tail end (the end provided with the second liquid release valve <NUM>) of the metering tube <NUM> in a sealed way. The metering capacity increase unit <NUM> and the metering tube <NUM> are connected and sealed in a glass ground opening mode, and are fixed by a clamp. When the capacity of the metering tube <NUM> cannot meet the capacity requirement of the distillate, the measurable capacity of the distillate may be increased in a mode of adding the metering capacity increase unit <NUM>, and one-step liquid discharge of the required amount of the distillate is realized on the basis. An error caused by the need of reading for many times when the liquid is discharged for many times is reduced. The metering accuracy of the distillate is favorably improved. The capacity increase of the metering tube <NUM> is realized through accurate metering cooperation of the metering capacity increase unit <NUM> and the metering tube <NUM>. The metering capacity increase units <NUM> of the present invention include a plurality of metering capacity increase units with different capacities, and are selected and replaced according to capacity requirements of the distillate. For example, the capacities of the metering capacity increase units <NUM> are designed into a plurality of values such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> to form one group. The proper metering capacity increase unit <NUM> is selected according to the required distillate capacity for one-step accurate liquid discharge. A shape of the metering capacity increase unit <NUM> may select a suitable flat flask structure or a bent tube connecting tube structure according to a distance from the collecting flask <NUM> to an operation platform, as long as a glass ground opening of the metering capacity increase unit <NUM> realizes matched sealing with a glass ground opening of the metering tube <NUM>. According to a structure as shown in <FIG>, as a preferable design, a certain capacity needs to be reserved outside a flask opening of the metering capacity increase unit <NUM> so as to contain a solution flowing down from the metering tube <NUM>, and the objective is achieved by a solution containing tray <NUM> integrally formed with the metering capacity increase unit <NUM>.

According to the rotary evaporator as shown in <FIG>, a distillation flask liquid discharge opening <NUM> is formed at a side wall of the bottom of the distillation flask <NUM> (subject to a work state position of the distillation flask <NUM>). The distillation flask liquid discharge opening <NUM> is formed in a liquid level bottom position of the distillation flask <NUM>, and is preferably formed in a lowest liquid level position of the distillation flask <NUM>. Additionally, a first liquid discharge valve <NUM> is further disposed at the distillation flask liquid discharge opening <NUM>, and is configured to perform liquid discharge control of the concentrated liquid and sealing. The first liquid discharge valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

The rotary evaporator of the present embodiment further includes a concentrated liquid quantification assembly connected to the distillation flask liquid discharge opening <NUM>. The concentrated liquid quantification assembly can realize quantitative control of the concentrated liquid. The concentrated liquid quantification assembly and the distillation flask liquid discharge opening <NUM> may be of an integrally formed structure or a structure connected in a sealed way through glass ground openings, and are fixed by a steel clamp with a screw to maintain sealing performance of a system.

According to the rotary evaporator as shown in <FIG>, the concentrated liquid quantification assembly of the present embodiment includes preferably a quantitative tube <NUM> connected to the distillation flask liquid discharge opening <NUM> in a sealed way. Quantitative scale lines <NUM> are provided on an outer wall of the quantitative tube <NUM>, and are configured to accurately quantify the concentrated liquid. A second liquid discharge valve <NUM> is disposed in a bottom position of the quantitative tube <NUM>, so as to control liquid discharge of the concentrated liquid and sealing. The quantitative tube <NUM> of the present embodiment is a metering fine tube with a cavity of a fine tubular structure, and its metering capacity is suitable a value in a range of <NUM> to <NUM>. Its metering scale is accurate to <NUM>, or even <NUM>. The second liquid discharge valve <NUM> may be made from a glass material or a polytetrafluoroethylene material.

As a transformable structure, according to the rotary evaporator as shown in <FIG>, a quantitative capacity increase unit <NUM> is further connected to a tail end (the end provided with the second liquid discharge valve <NUM>) of the quantitative tube <NUM> in a sealed way. The quantitative capacity increase unit <NUM> and the quantitative tube <NUM> are connected and sealed in a glass ground opening mode, and are fixed by a clamp. When the capacity of the quantitative tube <NUM> cannot meet the capacity requirement of the concentrated liquid, the quantifiable capacity of the concentrated liquid may be increased in a mode of adding the quantitative capacity increase unit <NUM>, and one-step liquid discharge of the required amount of concentrated liquid is realized on the basis. An error caused by the need of reading for many times when the liquid is discharged for many times is reduced. The metering accuracy of the concentrated liquid is favorably improved. The capacity increase of the quantitative tube <NUM> is realized through accurate metering cooperation of the quantitative capacity increase unit <NUM> and the quantitative tube <NUM>. The quantitative capacity increase units <NUM> of the present embodiment include a plurality of quantitative capacity increase units with different capacities, and are selected and replaced according to capacity requirements of the concentrated liquid. For example, the capacities of the quantitative capacity increase units <NUM> are designed into a plurality of values such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> to form one group. The proper quantitative capacity increase unit <NUM> is selected according to the required concentrated liquid capacity for one-step accurate liquid discharge of the concentrated liquid. A shape of the quantitative capacity increase unit <NUM> may select a suitable flat flask structure or a bent tube connecting tube structure according to a distance from the distillation flask <NUM> to an operation platform, as long as a glass ground opening of the quantitative capacity increase unit <NUM> realizes matched sealing with a glass ground opening of the quantitative tube <NUM>. According to a structure as shown in <FIG>, as a preferable design, a certain capacity needs to be reserved outside a flask opening of the quantitative capacity increase unit <NUM>, so as to contain a solution flowing down from the quantitative tube <NUM>, and the objective is achieved by a solution containing tray <NUM> integrally formed with the quantitative capacity increase unit <NUM>.

In a structure of the rotary evaporator as shown in <FIG>, the heating assembly is configured to perform heating evaporation on the solution to be distilled in the distillation flask <NUM>. The heating assembly of the present embodiment is an electric heating belt <NUM> disposed at an outer wall of the distillation flask <NUM>. The electric heating belt <NUM> performs heating evaporation on the liquid to be concentrated in the distillation flask <NUM> through heat conduction of the flask wall of the distillation flask <NUM>. Preferably, the electric heating belt <NUM> is wound around the outer wall of the distillation flask <NUM>, so as to ensure heating uniformity. At the same time, a glass fiber belt is disposed at an outer layer of the electric heating belt <NUM> and is used as a heat isolation material and a fixing layer to realize the heat isolation and fixation of the electric heating belt <NUM>. A temperature controller sensor probe is further disposed between the electric heating belt <NUM> and the outer wall of the distillation flask <NUM>, and detects the heating temperature.

According to the rotary evaporator of the present embodiment, the second liquid release valve <NUM> and the second liquid discharge valve <NUM> are closed at the beginning of the distillation, so that the inside of the distillation flask <NUM> and the inside of the collecting flask <NUM> still maintain a negative pressure state inside a distillation system. Constant subtle changes of the amount of the distillate and the amount of the concentrated liquid are observed during distillation. The first liquid release valve <NUM> and (or) the first liquid discharge valve <NUM> are (is) closed immediately as soon as the amount of distillate and (or) the amount of concentrated liquid reach (reaches) the designed accurate amount, and the distillation is stopped simultaneously. The accurately quantified distillate and (or) concentrated liquid are (is) discharged after the second liquid release valve <NUM> and (or) the second liquid discharge valve <NUM> are (is) opened, are (is) used to determine the distillation yield and determine the index indicating the quality of distillate or concentrated liquid, such as each ingredient of the distillate or the concentrated liquid, are(is) used to study and compare the performance of the concentrated liquid and distillate of different distillation samples on the basis of the same distillation yield, and are(is) further used to study performance differences of the distillate of the same distillation sample at different distillation stages and the concentrated liquid of the same distillation sample at different concentration degrees.

Claim 1:
An evaporator capable of accurately quantifying a concentrated liquid, comprising a support frame (<NUM>), wherein a detachable distillation flask (<NUM>) and a detachable condenser (<NUM>) are fixed on the support frame (<NUM>), the distillation flask (<NUM>) is configured to be heated through a heating assembly, and a bottom of the condenser (<NUM>) is connected to a collecting flask (<NUM>);
a distillation flask liquid discharge opening (<NUM>) is formed at the bottom of a work position of the distillation flask (<NUM>), and the distillation flask liquid discharge opening (<NUM>) is connected to a concentrated liquid quantification assembly configured to realize accurate quantitative control of the concentrated liquid;
wherein the concentrated liquid quantification assembly is a quantitative tube (<NUM>) with quantitative scale lines (<NUM>), and liquid discharge of the concentrated liquid and sealing of the distillation flask are controlled through a second liquid discharge valve (<NUM>) disposed at the bottom of the quantitative tube (<NUM>); and
a first liquid discharge valve (<NUM>) is disposed at the distillation flask liquid discharge opening (<NUM>), and configured to perform accurate discharge control of the concentrated liquid and sealing of the distillation flask;
characterized in that
the evaporator is a rotary evaporator;
the heating assembly is an electric heating belt (<NUM>) disposed at an outer wall of the distillation flask (<NUM>), and a temperature controller sensor probe is further disposed between the electric heating belt (<NUM>) and the distillation flask (<NUM>),
wherein the quantitative tube (<NUM>) is a metering fine tube with a cavity of a fine tubular structure, and its metering capacity is suitable to be a value in a range of <NUM> to <NUM>, wherein its metering scale is accurate to <NUM> or even <NUM>.