Evaporation experiment instrument

Abstract

The utility model discloses an evaporation experiment instrument, and relates to the field of chemical experiment equipment. Comprising an oil bath pan, a three-neck flask, a bent pipe, a spherical condenser pipe, an ox horn pipe, a first probe thermometer, a second probe thermometer, a support, a fixing frame, a lifting platform, a water inlet pipe, a water outlet pipe, a crystal slurry pump, a thermometer adjusting mechanism, a flat-bottom volumetric flask, a first ultrasonic liquid level sensor, a controller and a second ultrasonic liquid level sensor. The device disclosed by the utility model has the advantages that the probe of the No.2 probe thermometer is always arranged on the upper surface of mother liquor by 1-5mm along with the descending of the mother liquor in the three-neck flask, so that the accuracy and convenience of an experiment are ensured; the liquid level of the oil liquid in the oil bath pan and the liquid level of the mother liquid in the three-neck flask are just positioned on the same horizontal plane, so that crystal salt is prevented from being generated on the inner side of the bottle wall of the three-neck flask; and the phenomenon that the bottom of the three-neck flask is burnt out to cause non-uniform heating to generate explosion boiling is avoided.

Description

Technical field:

[0001] The utility model relates to the field of chemical experimental equipment, in particular to an evaporation experimental instrument. Background technology:

[0002] In the chemical production process, it is necessary to collect experimental data, so evaporation experimental equipment is usually used. Common evaporation equipment includes: an oil bath pot, two iron stands, a three-necked flask, a curved tube, a spherical condenser, a bull horn tube, a conical flask and two probe thermometers; the three-necked flask is fixed above the oil bath pot by connecting two iron stands, wherein the three-necked flask is filled with mother liquor to be evaporated, the middle bottle mouth of the three-necked flask is connected to the air inlet of the spherical condenser through a curved tube, and the liquid outlet of the spherical condenser is connected to the bottle mouth of the conical flask through a bull horn tube, wherein the bottle mouths on both sides of the three-necked flask are respectively plugged with rubber stoppers, and a probe thermometer is inserted in each rubber stopper, wherein the probe on one of the probe thermometers is inserted into the bottom of the mother liquor, and the probe on the other probe thermometer is placed on the upper surface of the mother liquor, and the temperature inside the liquid and the temperature of the gas phase on the evaporation surface of the liquid are measured respectively.

[0003] The technical defects existing in the existing technology are:

[0004] 1. During the evaporation and concentration process, the liquid level of the oil in the oil bath pot and the liquid level of the mother liquid in the three-necked flask are at the same level in the initial state. However, as the mother liquid in the three-necked flask is continuously heated, it will continue to decrease, causing the liquid level of the oil in the oil bath pot to gradually be higher than the liquid level of the mother liquid in the three-necked flask. At this time, crystallized salt will be produced on the inner side of the wall of the three-necked flask, which will also affect the temperature of the gas phase on the evaporation surface of the liquid, resulting in inaccurate experimental data measurement. Therefore, it is often necessary to manually adjust the liquid level position of the oil in the oil bath pot so that the liquid level of the oil in the oil bath pot and the liquid level of the mother liquid in the three-necked flask are at the same level, and adjust the probe on another probe thermometer to be inserted on the upper surface of the mother liquid to ensure the accuracy of the experiment, which is inconvenient to operate.

[0005] 2. During the evaporation and concentration process, as more and more crystallized salt precipitates from the bottom of the three-necked flask, it is easy to cause the three-necked flask to boil over due to uneven heating, affecting the concentration multiple and posing a safety hazard. Utility model content:

[0006] The purpose of the utility model is to provide an evaporation test instrument to solve the problems raised in the above background technology.

[0007] The utility model is implemented by the following technical solutions:

[0008] An evaporation experiment instrument comprises: an oil bath pot, a three-necked flask, a curved tube, a spherical condenser, a bull horn tube, a No. 1 probe thermometer and a No. 2 probe thermometer; the middle bottle mouth of the three-necked flask is connected to the air inlet of the spherical condenser arranged obliquely through the curved tube, the liquid outlet of the spherical condenser is installed with a bull horn tube, the bottle mouths on both sides of the three-necked flask are respectively plugged with rubber plugs, each rubber plug is inserted with a probe thermometer, the probe on the No. 1 probe thermometer is inserted into the bottom of the mother liquid, and the probe on the No. 2 probe thermometer is placed at the bottom of the mother liquid The upper surface also includes a bracket, a fixing frame, a lifting platform, a water inlet pipe, a water outlet pipe, a slurry pump, a thermometer adjustment mechanism, a flat-bottomed volumetric flask, a No. 1 ultrasonic liquid level sensor, a controller and a second ultrasonic liquid level sensor; the upper surface of the bracket is slidably provided with two symmetrically distributed fixing frames, the three-necked flask is fixedly clamped above the oil bath pot by the two fixing frames, the oil bath pot is placed on the lifting platform, and the lifting platform is fixedly arranged at the bottom of the bracket, so that the oil bath pot is vertically lifted and lowered between the bracket and the two fixing frames A water inlet pipe and a water outlet pipe are connected to the bottom of the three-necked flask, and the other ends of the water inlet pipe and the water outlet pipe are respectively connected to the water outlet and the water inlet of the slurry pump. The slurry pump is installed on one of the side walls of the fixed frame, and a thermometer adjustment mechanism is installed on the upper surface of the fixed frame close to the No. 2 probe thermometer. The No. 2 probe thermometer is fixedly clamped on the thermometer adjustment mechanism. The flat-bottomed volumetric flask is placed on the upper surface of the bracket, and the liquid outlet end of the ox horn tube is placed in the bottle mouth of the flat-bottomed volumetric flask. A vertically arranged liquid level tube is connected to one side of the top of the flat-bottomed volumetric flask. A No. 1 ultrasonic liquid level sensor is fixed at the bottle mouth of the top of the liquid level tube. The No. 1 ultrasonic liquid level sensor is electrically connected to the input end of the controller through a circuit, and the output end of the controller is electrically connected to the first drive motor of the lifting platform and the second drive motor of the thermometer adjustment mechanism, respectively. A second ultrasonic liquid level sensor is installed on the lower surface of the top of the fixed frame, which is located directly above the oil level of the oil bath pot, and the second ultrasonic liquid level sensor is electrically connected to the input end of the controller through a circuit.

[0009] Preferably, a through groove for accommodating an oil bath pot is provided on the upper surface of the bracket, and two dovetail grooves are also provided on the upper surface of the bracket along the sliding direction of the fixing frame, a dovetail plate is fixed to the bottom of the fixing frame, and a dovetail plate is slidably arranged in the dovetail groove.

[0010] Preferably, a filter screen is provided at the bottom of the three-necked flask above the inlet and outlet of the circulation pipeline.

[0011] Preferably, the fixing frame includes: a dovetail plate, which is fixed to one end of the dovetail plate close to the three-necked flask and the bottom end of the right-angle plate, an arc-shaped groove is provided on the top surface of the right-angle plate away from the end of the dovetail plate, two ribs are fixed on both sides of the middle part of the dovetail plate, the right-angle plate and the two ribs are perpendicular, a threaded through hole is provided on the dovetail plate between the two ribs, and a butterfly bolt is threadedly connected to the threaded through hole.

[0012] Preferably, the lifting platform includes four vertical rods evenly distributed and vertically fixed in the bottom of the bracket, the top ends of the four vertical rods are fixedly connected to the lower surface of the limit plate, the limit plate and the top end of the first screw are rotatably connected, the bottom end of the first screw is fixed to the output shaft of the first drive motor, the first drive motor is fixed in the bottom of the bracket and is located in the middle of the four vertical rods, a support platform is slidably arranged on the four vertical rods, the support platform is in a "mouth" structure, the center of the bottom of the support platform is threadedly connected to the first screw to move up and down, the limit plate is placed inside the support platform, and the oil bath pot is placed on the support platform.

[0013] Preferably, the thermometer adjustment mechanism includes: an A-frame fixed on the upper surface of the fixed frame, two second supports fixed on the A-frame, a second screw rotatably arranged between the two second supports, one end of the second screw being connected to the output shaft of the second drive motor, a second movable nut being threaded on the second screw, the handle of the No. 2 probe thermometer being fixed on the second movable nut, the second movable nut being in a square structure and its bottom surface being slidably fitted with the upper surface of the A-frame.

[0014] Preferably, the angle between the second probe thermometer and the surface of the mother liquid is 60°.

[0015] Preferably, a handle groove is provided on the rib plate.

[0016] Preferably, the water inlet pipe and the water outlet pipe are covered with a heat-insulating layer.

[0017] Preferably, the structural dimensions of the body of the flat-bottom volumetric flask are the same as the structural dimensions of the lower half of the body of the three-necked flask.

[0018] The utility model has the advantages that the structural dimensions of the body of the flat-bottomed volumetric flask are the same as those of the lower half of the body of the three-necked flask, ensuring that during the evaporation experiment, the height h1 of the mother liquid in the three-necked flask is equal to the height h1 of the condensate collected. 2，, a No. 1 ultrasonic liquid level sensor and a No. 2 ultrasonic liquid level sensor are used to detect the liquid level changes of the condensate collected in the flat-bottom volumetric flask and the oil in the oil bath pot respectively, and the detected liquid level change height is transmitted to the controller in the form of an electrical signal. The controller controls the first drive motor and the second drive motor separately, so that the probe of the No. 2 probe thermometer is always placed at a distance of 1-5mm from the upper surface of the mother liquid as the mother liquid in the three-necked flask descends, thereby ensuring the accuracy and convenience of the experiment; and the liquid level of the oil in the oil bath pot and the liquid level of the mother liquid in the three-necked flask are exactly at the same horizontal plane, thereby avoiding the generation of crystallized salt on the inner side of the wall of the three-necked flask; and avoiding the bottom of the three-necked flask from drying out and causing uneven heating and boiling. Description of the drawings:

[0019] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 for Figure 1 The cross-section at A in the middle;

[0021] Figure 3 It is a control flow chart of the utility model;

[0022] Figure 4 for Figure 1 The structural front view of the middle fixing frame;

[0023] Figure 5 for Figure 4 Right view of;

[0024] Figure 6 for Figure 5 A top view of

[0025] Figure 7 This is a reference diagram of the structure and liquid level changes of a three-necked flask and a flat-bottomed volumetric flask.

[0026] In the figure: 1. oil bath pot, 2. three-necked flask, 2.1. filter screen, 3. elbow, 4. spherical condenser, 5. ox-horn tube, 6. probe thermometer No. 1, 7. probe thermometer No. 2, 8. bracket, 8.1. through groove, 8.2. dovetail groove, 9. fixing frame, 9.1. dovetail plate, 9.11. threaded through hole, 9.2. right-angle plate, 9.21. arc groove, 9.3. rib plate, 9.31. handle through groove, 9.4. butterfly bolt, 10. lifting platform, 10.1. telescopic frame, 10.11. slide groove, 10.2. first support, 10.3. support plate, 10.4. first screw, 10.5. First drive motor, 10.6. First movable nut, 10.7. Limiting slider, 11. Water inlet pipe, 12. Water outlet pipe, 13. Slurry pump, 14. Thermometer adjustment mechanism, 14.1. Herringbone, 14.2. Second support, 14.3. Second screw, 14.4. Second drive motor, 14.5. Second movable nut, 15. Flat-bottomed volumetric flask, 15.1. Liquid level tube, 16. No. 1 ultrasonic liquid level sensor, 17. Controller, 18. Second ultrasonic liquid level sensor, h1. Height of mother liquid descent, h2. Height of condensate collection, h3. Height of oil level descent. Specific implementation method:

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-7 , the utility model provides a technical solution of evaporation test instrument:

[0029] An evaporation experiment instrument comprises: an oil bath pot 1, a three-necked flask 2, a curved tube 3, a spherical condenser 4, a bull horn tube 5, a first probe thermometer 6 and a second probe thermometer 7; the middle bottle mouth of the three-necked flask 2 is connected to the air inlet of the inclined spherical condenser 4 through the curved tube 3, the liquid outlet of the spherical condenser 4 is installed with the bull horn tube 5, a flat-bottomed volumetric flask 15 is placed on the upper surface of a bracket 8, and the liquid outlet end of the bull horn tube 5 is placed in the bottle mouth of the flat-bottomed volumetric flask 15, wherein the bottle mouths on both sides of the three-necked flask 2 are respectively plugged with rubber plugs, and each rubber plug is inserted with a probe thermometer, wherein the probe on the first probe thermometer 6 is inserted into the bottom of the mother liquid, and the probe on the second probe thermometer 7 is placed on the upper surface of the mother liquid, so as to measure the temperature inside the liquid and the temperature of the gas phase on the evaporation surface of the liquid respectively;

[0030] Based on the existing experimental equipment and to solve the technical defects existing in the prior art, the present application also includes a bracket 8, a fixing frame 9, a lifting platform 10, a water inlet pipe 11, a water outlet pipe 12, a slurry pump 13, a thermometer adjustment mechanism 14, a flat-bottomed volumetric flask 15, a first ultrasonic liquid level sensor 16, a controller 17 and a second ultrasonic liquid level sensor 18;

[0031] The upper surface of the bracket 8 is provided with a through groove 8.1 for accommodating the oil bath pot 1. The upper surface of the bracket 8 is also provided with two dovetail grooves 8.2 along the sliding direction of the fixing frame 9. A dovetail plate 9.1 is fixed to the bottom of the fixing frame 9. The dovetail plate 9.1 is slidably arranged in the dovetail groove 8.2. Two symmetrically distributed fixing frames 9 are slidably arranged on the upper surface of the bracket 8;

[0032] The fixing frame 9 includes: a dovetail plate 9.1 slidably arranged on the dovetail groove 8.2, the end of the dovetail plate 9.1 close to the three-necked flask 2 is fixed to the bottom end of the right-angle plate 9.2, an arc-shaped groove 9.21 is provided on the top surface of the right-angle plate 9.2 away from the dovetail plate 9.1, two ribs 9.3 are fixed on both sides of the middle part of the dovetail plate 9.1, a handle groove 9.31 is provided on the ribs 9.3, the right-angle plate 9.2 and the two ribs 9.3 are perpendicular, a threaded through hole 9.11 is provided on the dovetail plate 9.1 between the two ribs 9.3, and a butterfly bolt 9.4 is connected to the threaded through hole 9.11 to fix the fixing frame 9 on the bracket 8. The neck of the bottle mouth on both sides of the three-necked flask 2 is clamped and fitted by the arc-shaped grooves 9.21 on the two fixing frames 9, so that the three-necked flask 2 is fixedly clamped above the oil bath pot 1;

[0033] As the mother liquid in the three-necked flask 2 is continuously heated, the mother liquid in the three-necked flask 2 will be continuously reduced. In order to prevent the oil surface in the oil bath pot 1 from being higher than the mother liquid surface in the three-necked flask 2, the oil bath pot 1 is placed on a lifting platform 10, and the lifting platform 10 is fixedly arranged at the bottom of the bracket 8;

[0034] Among them, the lifting platform 10 includes: four vertical rods 10.1 evenly distributed and vertically fixed in the bottom of the bracket 8, the top ends of the four vertical rods 10.1 are fixedly connected to the lower surface of the limit plate 10.2, the limit plate 10.2 and the top end of the first screw 10.3 are rotatably connected, the bottom end of the first screw 10.3 is fixed to the output shaft of the first drive motor 10.4, the first drive motor 10.4 is fixed in the bottom of the bracket 8 and is located in the middle of the four vertical rods 10.1, and a support platform 10.5 is slidably arranged on the four vertical rods 10.1, the support platform 10.5 is in a "mouth" structure, and the center of the bottom of the support platform 10.5 is threadedly connected to the first screw 10.3 to move up and down, the limit plate 10.2 is placed inside the support platform 10.5, and the oil bath pot 1 is placed on the support platform 10.5. The first screw rod 10.3 is driven to rotate by the first driving motor 10.4, so that the oil bath pot 1 on the support platform 10.5 can be raised and lowered between the bracket 8 and the two fixing frames 9, so as to facilitate the adjustment of the position of the oil surface, so that the oil liquid level in the oil bath pot 1 and the liquid level of the mother liquid in the three-necked flask 2 are at the same horizontal plane, thereby ensuring the accuracy of the experiment.

[0035] During the evaporation and concentration process, as more and more crystallized salts are precipitated from the bottom of the three-necked flask, in order to prevent the bottom of the three-necked flask 2 from drying out and causing uneven heating and boiling, the bottom of the three-necked flask 2 is connected with an inlet pipe 11 and an outlet pipe 12, and the other ends of the inlet pipe 11 and the outlet pipe 12 are respectively connected to the outlet and inlet of the slurry pump 13. The inlet pipe 11 and the outlet pipe 12 are provided with an insulation layer to reduce the heat loss from the circulation pipeline 11, and the slurry pump 13 is installed on one of the side walls of the fixed frame 9. Under the action of the slurry pump 13, the mother liquor is continuously circulated at the bottom of the three-necked flask 2 to prevent the crystallized salt from adhering to the bottom of the flask after precipitation, resulting in uneven heating and boiling, and a filter screen 2.1 is arranged at the bottom of the three-necked flask 2 to prevent the crystallized salt from precipitating and causing blockage of the inlet pipe 11 and the outlet pipe 12.

[0036] In this scheme, a thermometer adjustment mechanism 14 is installed on the upper surface of the fixing frame 9 near the No. 2 probe thermometer 7, and the No. 2 probe thermometer 7 is fixedly clamped on the thermometer adjustment mechanism 14 to ensure that the angle between the No. 2 probe thermometer 7 and the surface of the mother liquid is 60°. Since the structural dimensions of the body of the flat-bottomed volumetric flask 15 are the same as those of the lower half of the body of the three-necked flask 2, during the evaporation experiment, the height h1 of the mother liquid in the three-necked flask 2 is equal to the height h2 of the condensate collection. According to the trigonometric function, it is obtained that: the moving distance of the No. 2 probe thermometer 7 is equal to the height h1 / sin60° of the mother liquid, which is equal to the height h2 / sin60° of the condensate collection. This facilitates the controller 17 to control the second drive motor 14.4 on the thermometer adjustment mechanism 14 to rotate and drive the moving distance of the No. 2 probe thermometer 7, so that the probe of the No. 2 probe thermometer 7 is always placed 1-5mm away from the upper surface of the mother liquid as the mother liquid in the three-necked flask 2 descends.

[0037] The thermometer adjustment mechanism 14 includes: an A-frame 14.1 fixed on the upper surface of the fixing frame 9, two second supports 14.2 fixed on the A-frame 14.1, a second screw 14.3 rotatably arranged between the two second supports 14.2, one end of the second screw 14.3 is connected to the output shaft of the second drive motor 14.4, a second movable nut 14.5 is screwed on the second screw 14.3, the handle of the No. 2 probe thermometer 7 is fixed on the second movable nut 14.5, and the second movable nut 14.5 is a square structure and its bottom surface is slidably fitted with the upper surface of the A-frame 14.1.

[0038] A vertically arranged liquid level tube 15.1 is connected to one side of the top of the flat-bottomed volumetric flask 15. A No. 1 ultrasonic liquid level sensor 16 is fixed at the top of the bottle mouth of the liquid level tube 15.1. The No. 1 ultrasonic liquid level sensor 16 is electrically connected to the input end of the controller 17 through a line. The output end of the controller 17 is electrically connected to the first drive motor 10.4 of the lifting platform 10 and the second drive motor 14.4 of the thermometer adjustment mechanism 14 respectively. A second ultrasonic liquid level sensor 18 is installed on the lower surface of the top of the fixed frame 9, which is located just above the oil level of the oil bath pot 1. The second ultrasonic liquid level sensor 18 is electrically connected to the input end of the controller 17 through a line.

[0039] The working principle is: the prerequisite for conducting the experiment is to ensure that the structural dimensions of the body of the flat-bottomed volumetric flask 15 are the same as the structural dimensions of the lower half of the body of the three-necked flask 2, so that the amount of mother liquid added to the lower half of the three-necked flask 2 is the same as the volume of the body of the flat-bottomed volumetric flask 15, and ensure that the height h1 of the mother liquid dropped in the three-necked flask 2 = the height h2 of the condensate collected; only then can subsequent experiments be carried out.

[0040] Then, the mother liquid is injected into the three-necked flask 2, and part of the mother liquid flows into the water inlet pipe 11 and the water outlet pipe 12. When the mother liquid reaches half of the body of the three-necked flask 2, the experiment is started. With continuous heating, the mother liquid in the three-necked flask 2 will continue to decrease, and the condensate collected in the flat-bottomed volumetric flask 15 will continue to increase, and condensation is a slow process. Therefore, the residual condensate content in the spherical condenser 4 connected between the two is very small and can be ignored; and the circulating mother liquid in the water inlet pipe 11 and the water outlet pipe 12 only circulates the bottom of the three-necked flask 2 to prevent the crystallized salt from being attached to the bottom of the flask after precipitation, resulting in uneven heating and boiling. The experiment itself is only an evaporation and concentration experiment of the mother liquid in the three-necked flask 2, and will not affect the height change of the mother liquid in the three-necked flask 2. The amount of circulating mother liquid in the water inlet pipe 11 and the water outlet pipe 12 is very small, so the circulating mother liquid in the water inlet pipe 11 and the water outlet pipe 12 has a negligible effect on the measurement of the experiment.

[0041] The condensate flows into the liquid level tube 15.1, and the height h2 of the condensate collected in the flat-bottom volumetric flask 15 is detected by the No. 1 ultrasonic liquid level sensor 16. The No. 1 ultrasonic liquid level sensor 16 converts the sound wave signal of the detected condensate height into an electrical signal and transmits it to the controller 17. The controller 17 controls the second drive motor 14.4 on the thermometer adjustment mechanism 14 to rotate, and drives the No. 2 probe thermometer 7 to move a distance; so that the probe of the No. 2 probe thermometer 7 is always placed at a distance of 1-5 mm from the upper surface of the mother liquid as the mother liquid in the three-necked flask 2 descends, thereby ensuring the accuracy and convenience of the experiment.

[0042] As the height h1 of the mother liquid in the three-necked flask 2 is constantly changing, and the height h1 of the mother liquid is equal to the height h2 of the condensate collection, when the mother liquid in the three-necked flask 2 is descending, the second ultrasonic level sensor 18 detects the height h3 of the oil level in the oil bath pot 1. The second ultrasonic level sensor 18 converts the acoustic wave signal of the oil level in the oil bath pot 1 into an electrical signal and transmits it to the controller 17. The controller 17 converts the height h2 of the condensate collection and the height h3 of the oil level descending into an electrical signal. 3 is used for difference comparison. When h2-h3>0, the controller 17 controls the first driving motor 10.4 on the lifting platform 10 to rotate, and drives the oil bath pot 1 on the supporting platform 10.5 to move downward through the first screw 10.3; when h2-h3=0, the controller 17 controls the first driving motor 10.4 on the lifting platform 10 to stop rotating. At this time, the liquid level of the oil in the oil bath pot 1 and the liquid level of the mother liquid in the three-necked flask 2 are exactly at the same horizontal plane, thereby avoiding the generation of crystallized salt on the inner side of the bottle wall of the three-necked flask.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An evaporation test apparatus, comprising: An oil bath pot (1), a three-necked flask (2), a curved tube (3), a spherical condenser (4), a bull horn tube (5), a first probe thermometer (6) and a second probe thermometer (7); the middle opening of the three-necked flask (2) is connected to the air inlet of the inclined spherical condenser (4) through the curved tube (3), the liquid outlet of the spherical condenser (4) is installed with a bull horn tube (5), the openings on both sides of the three-necked flask are respectively plugged with rubber plugs, each rubber plug is inserted with a probe thermometer, the probe on the first probe thermometer (6) is inserted into the bottom of the mother liquor, and the probe of the second probe thermometer (7) is placed on the upper surface of the mother liquor; The invention is characterized in that it also includes a bracket (8), a fixing frame (9), a lifting platform (10), a water inlet pipe (11), a water outlet pipe (12), a slurry pump (13), a thermometer adjustment mechanism (14), a flat-bottomed volumetric flask (15), a first ultrasonic liquid level sensor (16), a controller (17) and a second ultrasonic liquid level sensor (18); the upper surface of the bracket (8) is slidably provided with two symmetrically distributed fixing frames (9), the three-necked flask (2) is fixedly clamped above the oil bath pot (1) by the two fixing frames (9), and the oil The oil bath pot (1) is placed on a lifting platform (10), and the lifting platform (10) is fixedly arranged at the bottom of the bracket (8), so that the oil bath pot (1) can be vertically lifted and lowered between the bracket (8) and the two fixed frames (9). The bottom of the three-necked flask (2) is connected with a water inlet pipe (11) and a water outlet pipe (12), and the other ends of the water inlet pipe (11) and the water outlet pipe (12) are respectively connected to the water outlet and the water inlet of the slurry pump (13). The slurry pump (13) is installed on the side wall of one of the fixed frames (9), close to the second probe. A thermometer adjustment mechanism (14) is installed on the upper surface of the fixing frame (9) of the needle thermometer (7), the second probe thermometer (7) is fixedly clamped on the thermometer adjustment mechanism (14), the flat-bottom volumetric flask (15) is placed on the upper surface of the bracket (8), the liquid outlet end of the ox-horn tube (5) is placed in the bottle mouth of the flat-bottom volumetric flask (15), one side of the top of the flat-bottom volumetric flask (15) is connected to a vertically arranged liquid level tube (15.1), and a first ultrasonic liquid level sensor (16) is fixed at the bottle mouth of the top of the liquid level tube (15.1). The first ultrasonic liquid level sensor (16) is electrically connected to the input end of the controller (17) through a circuit, and the output end of the controller (17) is electrically connected to the first drive motor (10.4) of the lifting platform (10) and the second drive motor (14.4) of the thermometer adjustment mechanism (14) respectively. A second ultrasonic liquid level sensor (18) is installed on the lower surface of the top of the fixing frame (9) just above the oil surface of the oil bath pot (1), and the second ultrasonic liquid level sensor (18) is electrically connected to the input end of the controller (17) through a circuit.

2. An evaporation test instrument according to claim 1, characterized in that: The upper surface of the bracket (8) is provided with a through groove (8.1) for accommodating the oil bath pot (1), and the upper surface of the bracket (8) is also provided with two dovetail grooves (8.2) along the sliding direction of the fixing frame (9), a dovetail plate (9.1) is fixed to the bottom of the fixing frame (9), and a dovetail plate (9.1) is slidably arranged in the dovetail groove (8.2).

3. The evaporation test instrument according to claim 1, characterized in that: A filter screen (2.1) is arranged at the bottom of the three-necked flask (2).

4. The evaporation test instrument according to claim 1, characterized in that: The fixing frame (9) comprises a dovetail plate (9.1), one end of the dovetail plate (9.1) close to the three-necked flask (2) and the bottom end of the right-angle plate (9.2), an arc groove (9.21) is provided on the top surface of the right-angle plate (9.2) at one end away from the dovetail plate (9.1), two ribs (9.3) are fixed on both sides of the middle of the dovetail plate (9.1), the right-angle plate (9.2) and the two ribs (9.3) are perpendicular, and a threaded through hole (9.11) is provided on the dovetail plate (9.1) between the two ribs (9.3), and a butterfly bolt (9.4) is connected to the inner thread of the threaded through hole (9.11).

5. The evaporation test instrument according to claim 1, characterized in that: The lifting platform (10) comprises four vertical rods (10.1) evenly distributed and vertically fixed in the bottom of the bracket (8), the top ends of the four vertical rods (10.1) are fixedly connected to the lower surface of the limit plate (10.2), the limit plate (10.2) and the top end of the first screw (10.3) are rotatably connected, the bottom end of the first screw (10.3) is fixed to the output shaft of the first drive motor (10.4), the first drive motor (10.4) is fixed in the bottom of the bracket (8) and is located in the middle of the four vertical rods (10.1), a support platform (10.5) is slidably arranged on the four vertical rods (10.1), the support platform (10.5) is in a "mouth" structure, the center of the bottom of the support platform (10.5) is threadedly connected to the first screw (10.3) to move up and down, the limit plate (10.2) is placed inside the support platform (10.5), and the oil bath pot (1) is placed on the support platform (10.5).

6. The evaporation test instrument according to claim 1, characterized in that: The thermometer adjustment mechanism (14) comprises an A-frame (14.1) fixed on the upper surface of a fixing frame (9), two second supports (14.2) fixed on the A-frame (14.1), a second screw (14.3) rotatably arranged between the two second supports (14.2), one end of the second screw (14.3) being connected to the output shaft of a second drive motor (14.4), a second movable nut (14.5) being screwed onto the second screw (14.3), a handle of the second probe thermometer (7) being fixed on the second movable nut (14.5), the second movable nut (14.5) being in a square structure, the bottom surface of which is slidably fitted with the upper surface of the A-frame (14.1).

7. An evaporation test instrument according to claim 6, characterized in that: The angle between the second probe thermometer (7) and the surface of the mother liquid is 60°.

8. An evaporation test instrument according to claim 4, characterized in that: The rib plate (9.3) is provided with a handle through groove (9.31).

9. The evaporation test instrument according to claim 1, characterized in that: The water inlet pipe (11) and the water outlet pipe (12) are provided with a heat-insulating layer.

10. The evaporation test instrument according to claim 1, characterized in that: The structural dimensions of the body of the flat-bottomed volumetric flask (15) are the same as the structural dimensions of the lower half of the body of the three-necked flask (2).

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