CN210665397U - Device for measuring kinematic viscosity - Google Patents
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- CN210665397U CN210665397U CN201920857716.1U CN201920857716U CN210665397U CN 210665397 U CN210665397 U CN 210665397U CN 201920857716 U CN201920857716 U CN 201920857716U CN 210665397 U CN210665397 U CN 210665397U
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Abstract
The utility model relates to a kinematic viscosity measuring device, which comprises a double-bulb capillary viscometer, a sealed thermostat, a fixed jacket, a positioning platform, an automatic timing system and a suction cleaning system; the sealing constant temperature box is rotatably assembled on the positioning platform, and the double-bulb capillary viscometer is fixed in the sealing constant temperature box through the fixing jacket; the upper end openings of the main pipe and the branch pipe of the double-bulb capillary viscometer are respectively communicated with the suction cleaning system through pipelines, liquid level sensors are respectively arranged on the upper side and the lower side of an upper bulb and a lower bulb of the double-bulb capillary viscometer, and the liquid level sensors are respectively connected with an automatic timing system in a data transmission manner; therefore, the problem that the device for measuring kinematic viscosity in the prior art cannot realize automatic measurement in a wide viscosity range is solved; the utility model also provides a use method of the device for can satisfy the viscosity-temperature characteristic accurate measurement of non-transparent liquid or various colour liquid.
Description
Technical Field
The utility model relates to a measure kinematic viscosity device.
Background
Viscosity measurement is an important means for controlling production flow, ensuring production safety, evaluating product quality, medical detection and scientific research in the fields of petroleum, chemical industry, medicine, food, textile, national defense and the like. The capillary viscometer is one of the important methods for measuring kinematic viscosity, is known as the method with the highest precision in viscosity measurement, and is essential in the industries of petroleum, chemical industry, medicine and the like.
Capillary viscometers are based on the principle of relative measurement, i.e. the time required for a volume of liquid to flow through a capillary under the influence of gravity. Common capillary viscometer includes forward flow plano, uk and fen capillary viscometer, and reverse flow counter-flow capillary viscometer, and also various automatic or optimized capillary viscometer products, and most of them are optimized and deformed on the basis of these methods to improve precision or efficiency or use under certain conditions.
As the measurement range of the capillary viscometer with each specification is limited, dozens of capillary viscometers with different specifications are purchased to form a capillary viscometer group for use in actual work. The equipment cost is increased.
The capillary viscometer adopts a method of averaging by repeated measurement for many times in the working process, the forward flow capillary viscometer can perform repeated measurement after once cleaning, and has higher precision, and the reverse flow capillary viscometer needs to be cleaned after each measurement and has slightly lower precision. In particular, a counter-flow capillary viscometer is generally used for measuring the viscosity of non-transparent liquid such as petroleum products or liquid with various colors, and a forward-flow capillary viscometer is blocked by colors to sight and light. The capillary viscometer cleaning process is tedious, needs a large amount of hazardous chemicals reagents such as gasoline, petroleum ether, alcohol and the like to be repeatedly washed, increases the material cost and is not beneficial to laboratory safety.
Most of the existing automatic capillary viscometer is added with an automatic timing system and an automatic suction cleaning system on the basis of a forward capillary viscometer. The automatic timing system is mostly light and heat, photoelectricity, optical fiber sensor method, fixes the light source transmitting terminal in one side of capillary viscosimeter, and receiving end sensor original paper is fixed at the opposite side, utilizes the refraction characteristic of light to reach the timing purpose, and the equipment that non-transparent liquid or various colour liquid viscosity automated measurement need be measured at every turn to the part and wash, unable repeatability automatic measure.
In addition, the viscosity and the temperature of the fluid have a very close relationship, and the research on the viscosity-temperature characteristic of the sample has important significance. When the viscosity-temperature characteristic of a liquid sample is researched, the liquid viscosity is greatly reduced along with the increase of the temperature, the measurement range of a capillary viscometer with a single specification is limited, a plurality of capillary viscometers are often required to be used, the test is discontinuous, and the measurement error is inevitably caused.
In summary, the device for measuring kinematic viscosity in the prior art cannot realize automatic measurement in a wide viscosity range, especially accurate, automatic and wide viscosity range measurement of viscosity of non-transparent liquid or liquid with various colors.
SUMMERY OF THE UTILITY MODEL
The utility model provides a measure kinematic viscosity device for solve the unable wide viscosity scope automatic measurement problem of realizing of current measurement kinematic viscosity's device, the utility model also provides a use method of this measurement kinematic viscosity device for improve the device's measurement accuracy. In order to achieve the above object:
the utility model discloses a technical scheme that measurement kinematic viscosity device adopted specifically as follows:
a device for measuring kinematic viscosity comprises a double-bulb capillary viscometer, a sealed thermostat, a fixed jacket, a positioning platform, an automatic timing system and a suction cleaning system; the sealing constant temperature box is rotatably assembled on the positioning platform, and the double-bulb capillary viscometer is fixed in the sealing constant temperature box through the fixing jacket; the double-bulb capillary viscometer is characterized in that a main pipe of the double-bulb capillary viscometer and an upper end opening of a branch pipe are respectively communicated with the suction cleaning system through pipelines, liquid level sensors are respectively arranged on the upper side and the lower side of an upper bulb and a lower bulb of the double-bulb capillary viscometer, and the liquid level sensors are respectively connected with an automatic timing system in a data transmission mode.
The utility model discloses a measure kinematic viscosity device's beneficial effect: the structure and the corresponding connection relation of a double-ball capillary viscometer, a sealed thermostat, an automatic timing system and a suction cleaning system are reasonably arranged; the double-bulb capillary viscometer structure is adopted, the kinematic viscosity measurement in a wide viscosity range is realized in a real sense, the traditional mode of using a capillary viscometer group is replaced, the instrument cost is saved, the basic characteristics of a forward flow type capillary viscometer are reserved by the double-bulb capillary viscometer, the effectiveness and the precision are ensured in principle, and a good effect can be achieved; therefore, the problem that the device for measuring kinematic viscosity in the prior art cannot realize automatic measurement in a wide viscosity range is solved.
Further, the double-bulb capillary viscometer comprises a main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an upper bulb, a lower bulb, a capillary pipe, a suspension ball and a liquid storage ball, the inner surfaces of the joints among the components of the double-bulb capillary viscometer are in smooth circular arc transition, the central lines of the main pipe, the first branch pipe and the second branch pipe are on the same plane, the plane is a first plane, the central lines of the first branch pipe and the third branch pipe are parallel to each other, the plane is a second plane, the first plane and the second plane are vertical to each other, the middle position of the spherical surface of the liquid storage ball is provided with an overflow outlet, the tail end of the third branch pipe is in a hook shape and is communicated with the liquid storage ball overflow outlet, the upper bulb and the lower bulb are arranged on the main pipe, and the liquid level sensors respectively arranged on the lower side of the upper bulb and the upper side of the lower bulb can be the same liquid level sensor.
Has the advantages that: the double-bulb capillary viscometer comprises a main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an upper bulb, a lower bulb, a capillary pipe, a suspension ball and a liquid storage ball, wherein the inner surfaces of the joints among the parts are in smooth arc transition, so that the movement of liquid in the double-bulb capillary viscometer is facilitated; setting the first plane and the second plane as vertical planes, inclining the sealed constant temperature box parallel to the first plane from the main pipe to the direction of the first branch pipe, and keeping the overflow port of the third branch pipe in the middle of the liquid storage ball all the time in the inclining process so as not to flow into the overflow port along with the inclined sample of the instrument; the double-bulb capillary viscometer has the advantages that the structural arrangement is more reasonable, the volume of the double-bulb capillary viscometer is reduced, the constant volume of a sample in the liquid storage ball is guaranteed when the sealing thermostat is parallel to the first plane and inclines, and the measurement precision is improved.
Furthermore, the upper ball bulb and the lower ball bulb are both in an ellipsoid shape, the volume of the lower ball bulb is 3-6 times of that of the upper ball bulb, the suspension balls and the liquid storage balls are both in a spherical shape, the volume of the suspension balls and the volume of the liquid storage balls are equal to that of the lower ball bulb, the volume of the lower ball bulb is 6 times of that of the suspension balls and the liquid storage balls, and an included angle β between a connecting line of spherical centers of the suspension balls and the liquid storage balls and a horizontal plane is 15-75 degrees.
The device has the advantages that the upper bulb and the lower bulb are in an ellipsoid shape, liquid in the upper bulb and the lower bulb completely flows out when the double-bulb capillary viscometer is in an inclined rotating state, the liquid is prevented from remaining at the bottom of the upper bulb or the lower bulb, the position of the liquid storage ball center is higher than that of the suspension ball center when the suspension ball center is in a vertical state when the double-bulb capillary viscometer is in an inclined state, the position of the liquid storage ball center cannot be higher than that of the suspension ball center, liquid cannot flow into the liquid storage ball, the included angle between the connecting line of the ball centers of the suspension ball and the liquid storage ball and the horizontal plane is not smaller than the set maximum rotating angle of the sealed constant temperature box, the rotating angle of the sealed constant temperature box can be designed to be 15-60 degrees, the included angle β between the connecting line of the ball centers of the suspension ball and the liquid storage ball and the horizontal plane can be designed to be 15-75 degrees, so that the double-bulb capillary viscometer normally works in any inclined rotating state is ensured, the maximum rotating angle is set to be 60 degrees, the viscosity measurement range of the double-bulb viscometer is widest, the reasonable measurement range, the minimum included angle of the double-bulb and the liquid storage ball viscosity measurement of the double-liquid storage ball is ensured, the double-bulb is reasonably set up, the double-bulb and the capillary viscometer is reasonably set up the minimum sealed constant temperature-liquid-viscosity-.
Furthermore, the automatic measuring timing system comprises an electric bridge, a level conversion circuit, a single chip microcomputer and a digital display; the liquid level sensors respectively arranged on the upper side and the lower side of the upper bulb and the lower side of the lower bulb of the double-bulb capillary viscometer are platinum wire electrodes, one end of each platinum wire electrode is sintered in the glass tube wall of the main tube, the other end of each platinum wire electrode is provided with a binding post, and the binding posts are in conductive connection with the bridge arms of the bridge.
Has the advantages that: by reasonably arranging the structure of the automatic measuring and timing system, the automatic measuring and timing system can accurately display the signals detected by the liquid level sensor, so that the liquid levels on the upper side and the lower side of the upper bulb and the lower bulb are accurately detected; further improve the accuracy of two bulb capillary viscosimeters measurement.
Furthermore, the fixing jacket is fixed on the double-bulb capillary viscometer and is integrally mounted and dismounted on the sealed constant temperature box together with the double-bulb capillary viscometer, the electrode wiring of the automatic timing system is embedded in the fixing jacket, and the fixing jacket is made of a temperature-resistant heat-conducting material.
Has the advantages that: the fixing jacket fixes the double-bulb capillary viscometer, and an electrode circuit of the automatic timing system is embedded in the fixing jacket to form a whole, so that the double-bulb capillary viscometer is convenient to freely mount and dismount on a sealed thermostat and is ensured to be in a target position; the fixing clamping sleeves are made of temperature-resistant heat-conducting materials, and the temperature uniformity of the fluid in the double-bulb capillary viscometer is facilitated.
Further, the sealed constant temperature box comprises a box body, wherein the box body is made of heat-resistant glass; a heat insulation sleeve is arranged in the box body, an inlet pipe orifice is arranged at the lower part of the box body, an outlet pipe orifice is arranged at the upper part of the box body, a thermocouple is arranged at the bottom of the box body, and a sealing cover in threaded connection with the box body is arranged at the upper end of the box body; the sealed incubator further comprises a fixed cover arranged at the upper end of the incubator body.
Has the advantages that: a sealed constant temperature box is adopted, so that a constant temperature environment is provided, and the stability of a temperature field is better ensured; the box body is made of heat-resistant glass, so that the test process is visualized; different temperature control is finished by externally connecting a temperature control thermostatic bath, which is beneficial to realizing the accurate measurement of the relation between the viscosity and the temperature characteristic of the liquid.
Furthermore, the positioning platform comprises two A-shaped supports and a base fixedly connected with the A-shaped supports, a concentric shaft used for being assembled with the sealing thermostat in a rotating mode is arranged at the upper end of each A-shaped support, horizontal bubbles used for measuring levelness and a free height adjusting foot used for adjusting the height and the levelness of each A-shaped support are arranged on the base, and a positioning pin rod used for forming a rotating stop with the sealing thermostat is arranged on an inclined strut of each A-shaped support.
Has the advantages that: the structure of the positioning platform is reasonably arranged, so that the height and the levelness of the positioning platform can be freely adjusted, and the levelness of the horizontal bubble detection positioning platform is arranged on the base; a positioning pin rod used for forming a rotary stop with the sealed thermostat is arranged on an inclined strut of the A-shaped bracket; the sealed constant temperature box is fixed on different inclination angles by adjusting the position of the positioning pin rod.
Further, the suction cleaning system comprises a vacuum pump, a liquid pump, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve, a seventh electromagnetic valve, a sample bottle, a cleaning liquid bottle and a reagent bottle; the second electromagnetic valve and the third electromagnetic valve are three-way electromagnetic valves, the sixth electromagnetic valve is a multi-way electromagnetic valve, each electromagnetic valve is closed in a power-off state, and the pipeline is closed.
Has the advantages that: adopt the suction cleaning system of this structure can realize the thorough cleaning to two bulb capillary viscosimeters, avoid last time to measure the influence of remaining liquid to this experiment, further improve the detection accuracy of measuring kinematic viscosity device.
Furthermore, the device for measuring kinematic viscosity further comprises a control unit for realizing automatic control, wherein the control unit comprises a control panel, a controller, a logic control circuit and the like, and the control unit receives signals and sends instructions to realize the starting and stopping of the vacuum pump and the liquid pump, the opening and closing of each electromagnetic valve and the transmission of detection signals of the liquid level sensor.
Has the advantages that: through reasonable setting of the control unit structure, automatic control of the device for measuring kinematic viscosity is realized, labor intensity of experimenters is reduced, efficiency is improved, and influence caused by human factors is avoided.
The utility model discloses a technical scheme that measuring kinematic viscosity device's application method adopted specifically as follows:
(1) preparation before measurement: the positions of the double-bulb capillary viscometer in the sealed thermostat are checked, the good installation and sealing of each interface are ensured, the sealed thermostat is flexible to rotate, a positioning pin rod at the rear part of the positioning platform is adjusted to enable the thermostat to be vertical, and the free height adjusting foot at the bottom of the positioning platform is adjusted to enable bubbles at the upper part of the base to be horizontal.
(2) And (3) sample introduction: and (3) placing a sample to be detected and cleaning fluid into a corresponding sample bottle, a cleaning fluid bottle and a reagent bottle, electrifying a third electromagnetic valve to enable a pipeline to be communicated, electrifying a fifth electromagnetic valve to be opened, electrifying a sixth electromagnetic valve to enable a pipeline to be communicated, electrifying a seventh electromagnetic valve to be opened, starting a vacuum pump, enabling the sample to be detected to enter a liquid storage ball from a first branch pipe, closing the vacuum pump after working for a certain time, disconnecting the electromagnetic valve, finishing sample introduction, and enabling redundant samples to flow into a hook at the tail end of a fourth branch pipe from a liquid storage ball overflow port.
(3) Adjusting the sample amount: and the second electromagnetic valve is electrified to enable the pipeline d to be communicated, the third electromagnetic valve is electrified to enable the pipeline b to be communicated with the atmosphere, the liquid pump is started to pump out redundant samples, the liquid pump is closed and the electromagnetic valve is disconnected after working for a certain time, and the sample adjustment is finished.
(4) Keeping the temperature of the sample constant: the temperature to be measured is set, and the sealed constant temperature box is kept constant in temperature by an external constant temperature control groove.
(5) Adjusting the gradient of the double bulb capillary viscometer: and adjusting a positioning pin rod at the rear part of the positioning platform to enable the capillary tube to incline at a certain angle or to be kept vertical according to the measurement requirement.
(6) And (3) viscosity measurement: the third electromagnetic valve is electrified to the b pipeline to be communicated with the atmosphere, the fourth electromagnetic valve is electrified to be opened, the seventh electromagnetic valve is electrified to be opened, the vacuum pump is started, when the liquid level of the sample rises to the position of the first liquid level sensor, the controller receives a signal, the fifth electromagnetic valve is electrified to be opened, the vacuum pump is closed, the main pipe, the first branch pipe and the second branch pipe are communicated with the atmosphere, the liquid level of the sample automatically falls, the time difference that the sample flows through the second liquid level sensor and the third liquid level sensor, and the time difference that the sample flows through the third liquid level sensor and the fourth liquid level sensor are automatically recorded. The measurement is repeated for a plurality of times, and the measurement result is averaged.
(7) Cleaning: and the fifth electromagnetic valve is electrified and opened, the second electromagnetic valve is electrified to communicate the pipeline c, the sixth electromagnetic valve is electrified to communicate the pipeline f, the vacuum pump is started, the fourth electromagnetic valve is electrified and opened after a period of time, and the third electromagnetic valve is electrified to communicate the pipeline a.
(8) And (3) drying: and after the cleaning is finished, switching the sixth electromagnetic valve to the g pipeline to communicate with the atmosphere to dry the equipment.
The utility model discloses a measure kinematic viscosity device's application method's beneficial effect: when the method is used for measurement, the method is not limited by the color of liquid and the transparency of the liquid, and can meet the requirements of accurate, automatic and wide viscosity range measurement of the kinematic viscosity of non-transparent liquid or liquid with various colors; after the method is adopted for measurement, the cleaning is thorough, the use of a large amount of hazardous chemicals in the cleaning process is reduced, the use cost of consumables is reduced, the environment of a laboratory is improved, and the safety level of the laboratory is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the kinematic viscosity measuring device of the present invention;
FIG. 2 is a schematic structural view of a sealing incubator of an embodiment of the kinematic viscosity measuring device of the present invention;
FIG. 3 is a front view of a dual bulb capillary viscometer according to an embodiment of the kinematic viscosity measuring device of the present invention;
FIG. 4 is a partial left side view of a dual bulb capillary viscometer according to an embodiment of the kinematic viscosity measuring device of the present invention;
FIG. 5 is a schematic diagram of a suction cleaning system of an embodiment of the kinematic viscosity measurement device of the present invention;
fig. 6 is a schematic view of the angle β between the line connecting the centers of the suspension and reservoir spheres and the horizontal plane.
In the figure: 01-double bulb capillary viscometer, 02-sealed incubator, 03-fixed jacket, 04-positioning platform, 1-main pipe, 2-first branch pipe, 3-second branch pipe, 4-third branch pipe, 5-upper bulb, 6-lower bulb, 7-capillary, 8-suspension ball, 9-liquid storage ball, 10-overflow outlet, 11-first liquid level sensor, 12-second liquid level sensor, 13-third liquid level sensor, 14-fourth liquid level sensor, 15-inlet pipe orifice, 16-outlet pipe orifice, 17-heat preservation sleeve, 18-box, 19-fixed cover, 20-sealing cover, 21-thermocouple, 22-reagent bottle, 23-A type bracket, 24-concentric shaft, 25-fixed disc, 26-horizontal air bubbles, 27-free height adjusting feet, 28-positioning pin rods, 29-pipe inlet pipelines, 30-pipe outlet pipelines, 31-suction cleaning system pipelines, 32-vacuum pumps, 33-liquid pumps, 34-first electromagnetic valves, 35-second electromagnetic valves, 36-third electromagnetic valves, 37-fourth electromagnetic valves, 38-fifth electromagnetic valves, 39-sixth electromagnetic valves, 40-seventh electromagnetic valves, 41-main pipe outlet orifices, 42-first branch pipe outlet orifices, 43-second branch pipe outlet orifices, 44-third branch pipe outlet orifices, 45-sample bottles and 46-cleaning liquid bottles.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1 and 2, the device for measuring kinematic viscosity comprises a double-bulb capillary viscometer 01, a sealing incubator 02, a fixing jacket 03, a positioning platform 04, an automatic timing system and a suction cleaning system; the sealed constant temperature box 02 is rotatably assembled on the positioning platform 04; the double-bulb capillary viscometer 01 is fixed in a sealed thermostat 02 through a fixing jacket 03, a main pipe 1 of the double-bulb capillary viscometer 01 and an upper end opening of a branch pipe are respectively communicated with a suction cleaning system through a pipeline, the double-bulb capillary viscometer 01 adopts a double-bulb timing structure different from the conventional structure, double bulbs are respectively an upper bulb 5 and a lower bulb 6, liquid level sensors are respectively arranged on the upper side and the lower side of the upper bulb 5 and the lower bulb 6, the liquid level sensors arranged on the upper side of the upper bulb 5 are a first liquid level sensor 11 and a second liquid level sensor 12, and the liquid level sensor arranged on the lower side of the lower bulb 6 is a fourth liquid level sensor 14; in the embodiment, the liquid level sensors arranged on the lower side of the upper bulb 5 and the upper side of the lower bulb 6 are the same liquid level sensor, and the liquid level sensor is a third liquid level sensor 13; in other embodiments, the liquid level sensors disposed on the lower side of the upper bulb 5 and the upper side of the lower bulb 6 may not be the same liquid level sensor, that is, two liquid level sensors are respectively close to the upper bulb 5 and the lower bulb 6 to measure the liquid levels on the lower side of the upper bulb 5 and the upper side of the lower bulb 6. The first liquid level sensor 11, the second liquid level sensor 12, the third liquid level sensor 13 and the fourth liquid level sensor 14 are respectively connected with an automatic timing system in a data transmission mode. In this embodiment, the fixing jacket 03 is fixed to the double-bulb capillary viscometer 01, the double-bulb capillary viscometer 01 and the whole double-bulb capillary viscometer 01 are mounted and dismounted on the sealed incubator 02, the electrode wiring of the automatic timing system is embedded in the fixing jacket 03 to form a whole which is arranged in a modularized manner, and the fixing jacket 03 is made of a temperature-resistant heat-conducting material; in other embodiments, the fixing jacket 03 is also in a modular arrangement, and the fixing jacket 03 is made of a metal material or a heat-resistant and heat-conductive organic material.
As shown in fig. 3 and 4, the double-bulb capillary viscometer 01 comprises a main pipe 1, a first branch pipe 2, a second branch pipe 3, a third branch pipe 4, an upper bulb 5, a lower bulb 6, a capillary 7, a suspension ball 8 and a liquid storage ball 9, wherein each part of the double-bulb capillary viscometer 01 is a complete and inseparable whole, and the inner surfaces of the joints among the parts are in smooth circular arc transition. The central lines of the main pipe 1, the first branch pipe 2 and the second branch pipe 3 are all on the same plane, the plane is a first plane, the central lines of the first branch pipe 2 and the third branch pipe 4 are parallel to each other, the plane is a second plane, the first plane is perpendicular to the second plane, an overflow outlet 10 is formed in the middle of the spherical surface of the liquid storage ball 9, the tail end of the third branch pipe 4 is in a hook shape and is communicated with the overflow outlet 10 of the liquid storage ball 9, and the upper ball bulb 5 and the lower ball bulb 6 are arranged on the main pipe 1.
The double-bulb capillary viscometer 01 reserves the basic characteristics of a forward flow capillary 7 viscometer, ensures the effectiveness in principle, ensures the measurement accuracy and follows Poiseuille law.
The kinematic viscosity of the capillary 7 viscometer after kinetic energy correction and end correction is calculated from the Poiseuille law as follows:
when the outflow time t is greater than a certain value, generally t ≧ 200s, the calculation formula is simplified as:
obviously, the capillary 7 viscometer measurement range is proportional to the vertical effective height h, and inversely proportional to the capillary 7 viscometer bulb volume V.
In order to realize that the double-bulb capillary viscometer 01 can meet the purpose of measuring within a wide viscosity range, a double-bulb timing structure design with different volumes is adopted. The capillary 7 of the double-bulb capillary viscometer 01 is 2.0mm in thickness, the volume of the upper bulb 5 is designed to be 1ml, the volume of the lower bulb 6 is designed to be 5ml, and the distance from the lower end of the upper bulb 5 to the upper end of the lower bulb 6 is 2 cm.
In order to realize that the double bulb capillary viscometer 01 can meet the purpose of measuring within a wide viscosity range and enable the inclination angle of the capillary tube 7 to be adjustable so as to realize the purpose of changing the effective height h in the vertical direction, the sealing thermostat is designed to be capable of freely inclining and drives the double bulb capillary viscometer to rotate within the range of 0-60 degrees.
The volume of the suspension ball 8 is designed to be 5ml, the volume of the liquid storage ball 9 is designed to be 30ml, the upper ball bulb 5 and the lower ball bulb 6 are ellipsoidal, the suspension ball 8 and the liquid storage ball 9 are spherical, an included angle between a connecting line of the ball centers of the suspension ball 8 and the liquid storage ball 9 and the capillary tube 7 is designed to be 30 degrees, namely, the included angle β between the connecting line of the ball centers of the suspension ball 8 and the liquid storage ball 9 and a horizontal plane is 60 degrees.
When the upper bulb 5 and the double-bulb capillary viscometer 01 are adopted to be vertical, the capillary constant C is 1.0mm2/s2Because the liquid outflow time t is generally (200-600) s, the measurement range is as follows: v. of1＝C·t＝(200～600)mm2/s；
When the upper bulb 5 and the double-bulb capillary viscometer 01 are inclined at α degrees of 60 degrees, the measurement range is v2＝v1·cosα＝(100～300)mm2/s；
When the lower bulb 6 and the double-bulb capillary viscometer 01 are adopted to be vertical, the measurement range is as follows:
when the lower bulb 6 and the double-bulb capillary viscometer 01 are inclined at α degrees of 60 degrees, the measurement range is v4＝v3·cosα＝(20～60)mm2/s；
The double-bulb capillary viscometer (01) can realize (20-600) mm2Viscosity range measurement in/s.
In other embodiments, the thickness of the capillary 7 can be 1.0mm, 2.0mm, 3.0mm or 4.0mm, the volume of the upper bulb 5 is designed to be 1ml, the volume of the lower bulb 6 can be designed to be 3ml, 4ml, 5ml or 6ml, the distance from the lower end part of the upper bulb 5 to the upper end part of the lower bulb 6 is 2cm, the maximum inclination angle α of the rotary incubator is not more than 60 degrees, can be set to be 15 degrees, 45 degrees or 60 degrees, the included angle β between the connecting line of the suspension ball 8 and the center of the liquid storage ball 9 and the horizontal plane is not less than the corresponding maximum inclination angle α, can be set to be 15 degrees, 30 degrees, 45 degrees, 60 degrees or 75 degrees, namely α degrees, β degrees is not less than 15 degrees, 387 degrees is optimal, 15 degrees is β degrees, α is 30 degrees, β degrees is not less than 30 degrees, optimally, β is 30 degrees, α is 45 degrees, β degrees, not less than 45 degrees, optimally β degrees is 45 degrees, β degrees can meet design requirements, and the included angle between the.
Four liquid level sensors on the upper side and the lower side of the upper bulb 5 and the lower bulb 6 on the main pipe 1 of the double-bulb capillary viscometer 01 are all platinum wire electrodes; the four platinum wire electrodes are respectively platinum wire electrodes a, b, c and d; one end of each of the four platinum wire electrodes is sintered in the glass tube wall of the main tube 1, and the other end of each platinum wire electrode is provided with four binding posts, namely a binding post, b binding post, c binding post and d binding post; the first liquid level sensor 11 is 1.5cm above the upper end of the upper bulb 5, the second liquid level sensor 12 is 1cm above the upper end of the upper bulb 5, the third liquid level sensor 13 is located between the lower end of the upper bulb 5 and the upper end of the lower bulb 6, and the fourth liquid level sensor 14 is 1cm below the lower end of the lower bulb 6.
The automatic measuring timing system comprises an electric bridge, a level conversion circuit, a singlechip and a digital display; the terminals a, b, c and d are respectively in conductive connection with bridge arms of the bridge; when the liquid level flows through a, b, c and d, the resistance of the bridge changes, the voltage output signal of the bridge is amplified by the amplifier and then is connected to the level conversion circuit, and automatic timing is realized by the singlechip and the digital display.
The fixed jacket 03 is connected in the sealed constant temperature box 02, and the fixed jacket 03 is in threaded connection with the sealed constant temperature box 02; the sealed constant temperature box 02 comprises a box body 18, and the box body 18 is made of heat-resistant glass; a heat insulation sleeve 17 is arranged in the box body 18, the lower part of the box body 18 is provided with an inlet pipe orifice 15, the upper part of the box body 18 is provided with an outlet pipe orifice 16, the bottom of the box body is provided with a thermocouple 21, and the thermocouple is immersed in a constant temperature bath, so that the real-time monitoring of the temperature is facilitated, and the measurement error is reduced to the maximum extent; the upper end is provided with a sealing cover 20 which is in threaded connection with the box body 18; the sealed incubator 02 further comprises a fixing cover 19 provided at the upper end of the case 18. The box body 18 of the sealed constant temperature box 02 is provided with two symmetrical fixed disks 25, the sealed constant temperature box 02 needs to be externally connected with a temperature control constant temperature bath, and the temperature control constant temperature bath is separated from the sealed constant temperature box 02, so that the influence caused by vibration is avoided to the maximum extent; the tank 18 is filled with methyl silicone oil to keep the temperature of the tank 18 constant. In other embodiments, the sealed incubator 02 may adopt other structures of a cylindrical body or a tubular body with a sealing cover 20.
As shown in fig. 1, the positioning platform 04 comprises two a-type supports 23 and a base fixedly connected with the a-type supports 23, a concentric shaft for rotationally assembling with the sealed incubator 02 is arranged at the upper end of the a-type support 23, two symmetrical fixed disks 25 are fixedly connected to the outer side surface of the upper part of the box body 18 of the sealed incubator 02, concentric holes are formed in the fixed disks 25, and the concentric shafts are rotationally assembled in the concentric holes; in other embodiments, the rotational assembly between the body of the sealed incubator 02 and the positioning platform 04 may be implemented by disposing pins on the same straight line on two sides of the body of the sealed incubator 02, disposing pin holes on the positioning platform 04 for rotationally fitting with the pins, and rotationally fitting the body of the sealed incubator 02 and the positioning platform 04 through the rotational fitting between the pin holes and the pins. A horizontal bubble 26 for measuring levelness and a free height adjusting foot 27 for adjusting the height and levelness of the A-shaped bracket 23 are arranged on the base, and a positioning pin rod 28 for forming a rotary stop with the sealing thermostat 02 is arranged on an inclined strut of the A-shaped bracket 23; by adjusting the position of the positioning pin 28, the sealed oven 02 is fixed at different tilt angles.
As shown in fig. 5, the suction cleaning system includes a vacuum pump 32, a liquid pump 33, a first electromagnetic valve 34, a second electromagnetic valve 35, a third electromagnetic valve 36, a fourth electromagnetic valve 37, a fifth electromagnetic valve 38, a sixth electromagnetic valve 39, a seventh electromagnetic valve 40, a sample bottle 45, a cleaning liquid bottle 46, and a reagent bottle 22; the second electromagnetic valve 35 and the third electromagnetic valve 36 are three-way electromagnetic valves, and the sixth electromagnetic valve 39 is a multi-way electromagnetic valve, and in a power-off state, each electromagnetic valve is closed, and a pipeline is closed; the fourth solenoid valve 37 controls the main pipe outlet 41, the third solenoid valve 36 controls the first branch pipe orifice 42, the fifth solenoid valve 38 controls the second branch pipe orifice, and the second solenoid valve 35 controls the third branch pipe outlet 44. An inlet pipe orifice pipeline 29 and an outlet pipe orifice pipeline 30 of the sealed constant temperature box 02 and a suction cleaning system pipeline 31 are respectively communicated with an inlet liquid outlet fixed adapter and a suction cleaning fixed adapter arranged on the fixed disc 25.
The device for measuring the kinematic viscosity further comprises a control unit for realizing automatic control, wherein the control unit comprises a control panel, a controller, a logic control circuit and the like, receives signals and sends instructions to realize the starting and stopping of the vacuum pump 32 and the liquid pump 33, the starting and stopping of each electromagnetic valve and the transmission of detection signals of the liquid level sensor. In other embodiments, the control unit may not be provided, and manual control may be used instead of control by the control unit.
The utility model discloses a technical scheme that measuring kinematic viscosity device's application method adopted specifically as follows:
(1) preparation before measurement: the position of the double-bulb capillary viscometer 01 in the sealed thermostat 02 is checked to ensure that the installation and the sealing of each interface are good, the sealed thermostat 02 rotates flexibly, a positioning pin rod 28 at the rear part of the positioning platform 04 is adjusted to ensure that the thermostat is vertical, and the height of the bottom of the positioning platform 04 is adjusted freely by a foot 27 to ensure that bubbles at the upper part of the base are horizontal.
(2) And (3) sample introduction: the sample to be detected and the cleaning solution are placed into the corresponding sample bottle 45, the cleaning bottle 46 and the reagent bottle 22, the third electromagnetic valve 36 is electrified to enable the pipeline a to be communicated, the fifth electromagnetic valve 38 is electrified to be opened, the sixth electromagnetic valve 39 is electrified to enable the pipeline e to be communicated, the seventh electromagnetic valve 40 is electrified to be opened, the vacuum pump 32 is started, the sample to be detected enters the liquid storage ball 9 from the first branch pipe 2, after the sample to be detected works for a certain time, the vacuum pump 32 is closed, the electromagnetic valves are disconnected, and after sample introduction is finished, the redundant sample can flow into the hook at the tail end of the fourth branch pipe from the overflow port 10.
(3) Adjusting the sample amount: and the second electromagnetic valve 35 is electrified to enable the pipeline d to be communicated, the third electromagnetic valve 36 is electrified to enable the pipeline b to be communicated with the atmosphere, the liquid pump 33 is started to pump out redundant samples, the liquid pump 33 is closed after working for a certain time, the electromagnetic valves are disconnected, and sample adjustment is finished.
(4) Keeping the temperature of the sample constant: the temperature to be measured is set, and the sealed thermostat 02 is kept constant by an external constant temperature control tank.
(5) Adjusting the gradient of the double bulb capillary viscometer (01): according to the measurement requirement, the positioning pin rod 28 at the rear part of the positioning platform 04 is adjusted to enable the capillary 7 to incline a certain angle or keep vertical.
(6) And (3) viscosity measurement: the third electromagnetic valve 36 is electrified to the b pipeline to be communicated with the atmosphere, the fourth electromagnetic valve 37 is electrified and opened, the seventh electromagnetic valve 40 is electrified and opened, the vacuum pump 32 is opened, when the liquid level of the sample rises to the position of the first liquid level sensor 11, the controller receives a signal, the fifth electromagnetic valve 38 is electrified and opened, the vacuum pump 32 is closed, the main pipe 1, the first branch pipe 2 and the second branch pipe 3 are communicated with the atmosphere, the liquid level of the sample automatically falls, the time difference that the sample flows through the second liquid level sensor 12 and the third liquid level sensor 13, and the time difference that the sample flows through the third liquid level sensor 13 and the fourth liquid level sensor 14 are automatically recorded, and the motion viscosity of. The measurement is repeated for a plurality of times, and the measurement result is averaged.
Particularly, when the relation between the viscosity and the temperature characteristic of the liquid sample is measured, the viscosity of the liquid decreases along with the increase of the temperature, the temperature rising type measurement is adopted, and the four to six steps are repeated in a mode of 'upper bulb 5+ vertical' - 'upper bulb 5+ inclined' - 'lower bulb 6+ vertical' - 'lower bulb 6+ inclined', without changing the liquid sample.
(7) Cleaning: the fifth electromagnetic valve 38 is electrified and opened, the second electromagnetic valve 35 is electrified to communicate the pipeline c, the sixth electromagnetic valve 39 is electrified to communicate the pipeline f, the vacuum pump 32 is started, the fourth electromagnetic valve 37 is electrified and opened after a period of time, and the third electromagnetic valve 36 is electrified to communicate the pipeline a.
(8) And (3) drying: after the cleaning is finished, switching the sixth electromagnetic valve 39 to the g pipeline to communicate with the atmosphere for drying the equipment.
The utility model discloses in, for the same capillary viscometer as usual of accurate measurement that realizes liquid sample kinematic viscosity, kinematic viscosity measuring device need carry out the capillary constant and markd. According to the work needs, when adopting standard viscosity liquid to carry out the capillary constant calibration to this instrument under various operating modes, the ball bubble, the temperature and the inclination different value of setting all belong to the utility model discloses a protection scope.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (9)
1. A device for measuring kinematic viscosity, comprising: the device comprises a double-bulb capillary viscometer, a sealed thermostat, a fixed jacket, a positioning platform, an automatic timing system and a suction cleaning system; the sealing constant temperature box is rotatably assembled on the positioning platform, and the double-bulb capillary viscometer is fixed in the sealing constant temperature box through the fixing jacket; the double-bulb capillary viscometer is characterized in that a main pipe of the double-bulb capillary viscometer and an upper end opening of a branch pipe are respectively communicated with the suction cleaning system through pipelines, liquid level sensors are respectively arranged on the upper side and the lower side of an upper bulb and a lower bulb of the double-bulb capillary viscometer, and the liquid level sensors are respectively connected with an automatic timing system in a data transmission mode.
2. The apparatus of claim 1, wherein: the double-bulb capillary viscometer comprises a main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an upper bulb, a lower bulb, a capillary pipe, a suspension ball and a liquid storage ball, wherein the inner surfaces of joints among the components of the double-bulb capillary viscometer are in smooth arc transition, the center lines of the main pipe, the first branch pipe and the second branch pipe are on the same plane, the plane is a first plane, the center lines of the first branch pipe and the third branch pipe are parallel to each other and form a second plane, the first plane and the second plane are perpendicular to each other, an overflow outlet is formed in the middle of the spherical surface of the liquid storage ball, the tail end of the third branch pipe is in a hook shape and is communicated with the liquid storage ball overflow outlet, the upper bulb and the lower bulb are arranged on the main pipe, and liquid level sensors respectively arranged on the lower side of the upper bulb and the upper side of the lower bulb can be the.
3. The device for measuring kinematic viscosity according to claim 2, wherein the upper bulb and the lower bulb are both ellipsoidal, the volume of the lower bulb is 3-6 times of the volume of the upper bulb, the suspension ball and the liquid storage ball are both spherical, the volume of the suspension ball is equal to that of the lower bulb, the volume of the liquid storage ball is 6 times of that of the lower bulb, and an included angle β between a connecting line of the centers of the suspension ball and the liquid storage ball and a horizontal plane is 15-75 degrees.
4. The apparatus of claim 1, 2 or 3, wherein: the automatic timing system comprises an electric bridge, a level conversion circuit, a singlechip and a digital display; the upper side and the lower side of an upper bulb and a lower bulb of the double-bulb capillary viscometer are respectively provided with a liquid level sensor, the liquid level sensors are platinum wire electrodes, one end of each platinum wire electrode is sintered in the glass tube wall of the main tube, the other end of each platinum wire electrode is provided with a binding post, and the binding posts are in conductive connection with the bridge arms of the bridge.
5. The apparatus of claim 2 or 3, wherein: the double-bulb capillary viscometer is fixed by the fixing jacket, and is integrally mounted and dismounted on the sealed constant temperature box together with the double-bulb capillary viscometer, the electrode wiring of the automatic timing system is embedded in the fixing jacket, and the fixing jacket is made of a temperature-resistant heat-conducting material.
6. The apparatus of claim 1, wherein: the sealed constant temperature box comprises a box body, wherein the box body is made of heat-resistant glass; a heat insulation sleeve is arranged in the box body, an inlet pipe orifice is arranged at the lower part of the box body, an outlet pipe orifice is arranged at the upper part of the box body, a thermocouple is arranged at the bottom of the box body, and a sealing cover in threaded connection with the box body is arranged at the upper end of the box body; the sealed incubator further comprises a fixed cover arranged at the upper end of the incubator body.
7. The apparatus of claim 1, wherein: the positioning platform comprises two A-shaped supports and a base fixedly connected with the A-shaped supports, the upper ends of the A-shaped supports are provided with concentric shafts which are used for being assembled with the sealed thermostat in a rotating mode, the base is provided with horizontal bubbles which are used for measuring levelness and free height adjusting feet which are used for adjusting the height and the levelness of the A-shaped supports, and a positioning pin rod which is used for forming a rotating stop with the sealed thermostat is arranged on an inclined strut of the A-shaped supports.
8. The apparatus of claim 1, wherein: the suction cleaning system comprises a vacuum pump, a liquid pump, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve, a seventh electromagnetic valve, a sample bottle, a cleaning liquid bottle and a reagent bottle; the second electromagnetic valve and the third electromagnetic valve are three-way electromagnetic valves, the sixth electromagnetic valve is a multi-way electromagnetic valve, each electromagnetic valve is closed in a power-off state, and the pipeline is closed.
9. The apparatus of claim 1, wherein: the device for measuring the kinematic viscosity further comprises a control unit for realizing automatic control, wherein the control unit comprises a control panel, a controller and a logic control circuit, and the control unit receives signals and sends instructions to start and stop the vacuum pump and the liquid pump, start and stop each electromagnetic valve and transmit detection signals of the liquid level sensor.
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| CN201920857716.1U CN210665397U (en) | 2019-06-10 | 2019-06-10 | Device for measuring kinematic viscosity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114428038A (en) * | 2021-12-31 | 2022-05-03 | 陕西科技大学 | Experimental device for measuring liquid viscosity coefficient by falling ball method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114428038A (en) * | 2021-12-31 | 2022-05-03 | 陕西科技大学 | Experimental device for measuring liquid viscosity coefficient by falling ball method |
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