CN102721630A - Liquid-liquid isolation-type capillary viscometer - Google Patents

Abstract

The invention discloses a liquid-liquid isolation type capillary viscometer, comprising a sample bottle, a solvent bottle, a liquid-liquid isolator, capillary I, capillary II, an air bag type pneumatic pump, a control system, and a pneumatic system, wherein the capillary I, The liquid-liquid isolator and capillary II are connected sequentially, and the other end of capillary I is connected to the air bag type pneumatic pump; there is a branch on the pipeline connecting the liquid-liquid isolator and capillary II, and the sample bottle and solvent bottle are respectively connected to Branch piping connections. Compared with the traditional capillary viscometer, the liquid-liquid isolated capillary viscometer of the present invention eliminates the influence of pump fluctuation, improves the measurement accuracy, has high measurement sensitivity and stability, and is less affected by temperature. On-line measurement can be realized conveniently, and the degree of automation is high.

Description

A liquid-liquid isolated capillary viscometer

technical field

The invention relates to a liquid-liquid isolation type capillary viscometer.

Background technique

The importance of viscosity measurement in many industrial sectors and scientific research fields is well known, and it is widely used in petroleum, chemical, medical and other industries. The automatic control of the production process of medicines and drugs, the quality inspection of various petroleum products and paints, etc., all require viscosity measurement. Measuring the viscosity of blood and biological fluids in medicine has very important clinical significance. Commonly used viscosity measurement has a capillary viscometer (such as an Ostwald viscometer), and a capillary viscometer is used to measure viscosity, using a comparative method (time-sharing comparison). When using this method to measure viscosity, it is difficult to ensure that the conditions of each measurement are the same, so the accuracy is relatively low, it is greatly affected by temperature, the operation steps are cumbersome, and it is difficult to realize automation.

Contents of the invention

Aiming at the above-mentioned prior art, the present invention provides a liquid-liquid isolated capillary viscometer. The present invention adopts a scheme of simultaneous measurement with a liquid-liquid isolator (which is the key to ensure simultaneous measurement) in the middle of two capillary tubes connected in series. It solves the problem of low measurement accuracy and can realize automatic online measurement.

The present invention is achieved through the following technical solutions:

A liquid-liquid isolation type capillary viscometer, including a sample bottle, a solvent bottle, a liquid-liquid isolator, a capillary I, a capillary II, an air bag type pneumatic pump, a control system, and a pneumatic system, wherein the capillary I, the liquid-liquid isolation The other end of the capillary I is connected to the air bag type pneumatic pump; there is a branch on the pipeline connected between the liquid-liquid isolator and the capillary II, and the sample bottle and the solvent bottle are respectively connected to the branch pipeline. connect;

The two ends of the capillary I and the capillary II are respectively provided with a differential pressure sensor, and the differential pressure sensor is connected to the control system circuit through an amplification circuit;

A pneumatic valve is provided on the pipeline between the branch and capillary II;

A switching solenoid valve is provided on the pipeline between the capillary I and the liquid-liquid separator;

A switching solenoid valve is provided on the pipeline between the capillary II and the pneumatic valve;

The Hall sensors at both ends of the liquid-liquid isolator are connected to the control system circuit;

A switching solenoid valve is provided on the branch;

An elastic airbag type pneumatic pump is provided on the pipeline connecting the sample bottle and the branch, and a check valve is respectively provided on the pipelines on both sides of the elastic airbag type pneumatic pump;

The pipeline connecting the solvent bottle and the branch is provided with an elastic airbag type pneumatic pump, and the pipelines on both sides of the elastic airbag type pneumatic pump are respectively provided with a check valve;

Both the airbag-type pneumatic pump and the elastic airbag-type pneumatic pump are connected to the pneumatic system through a reversing solenoid valve;

Both the switching solenoid valve and the reversing solenoid valve are connected with the control system circuit through the driving circuit.

The liquid-liquid isolator includes a housing, and a Hall sensor is provided on both sides of the housing, and the Hall sensor is connected to the control system circuit; one side of the housing is provided with a reference liquid inlet and outlet, and the other side is provided with a sample Liquid inlet and outlet; a flexible diaphragm is arranged in the shell, and a disc-shaped magnet is arranged in the middle of the flexible diaphragm. See Figure 3.

The housing is composed of left and right parts connected by bolts, furthermore, a seal is provided at the connection.

The airbag-type pneumatic pump includes a housing, and a cavity is formed in the housing—a liquid storage chamber. An air bag is provided in the cavity (to isolate gas and liquid), and an inflation port is provided on the upper end of the housing. The inflation port is connected with the cavity. The upper end is connected, and the lower end of the shell is provided with a liquid inlet and outlet.

The housing is composed of upper and lower parts connected by bolts.

The elastic air bag type pneumatic pump includes a housing, in which a cavity is formed - a liquid storage chamber, an elastic air bag is provided in the cavity, an inflation port is provided at the upper end of the housing, the inflation port communicates with the elastic air bag, and the lower end of the housing There is a liquid inlet and outlet. The structure of the elastic air bag pneumatic pump is similar to that of the air bag air pump, the only difference is that the air bag of the elastic air bag air pump is elastic, and can shrink by itself when the gas pressure in the air bag is not high.

The housing is composed of upper and lower parts connected by bolts.

A liquid injection port is also provided on the branch road, and a one-way valve is provided at the liquid injection port.

Both the control system and the pneumatic system are conventional technologies in the prior art, and are easy to implement for those skilled in the art, and the present invention has no improvement on them, and will not be repeated here.

Working principle: Two capillary tubes are connected in series and a liquid-liquid separator is set in the middle, so that the solvent liquid and the sample liquid flow in the pipeline at the same flow rate (but do not flow through the differential pressure sensor) and cannot be mixed at the same time. Two differential pressure sensors are respectively connected to the two ends of the two capillaries. When the two liquids flow through the two capillaries, a pressure drop is generated at the two ends of the two capillaries respectively, and the pressure difference between the two ends of the two capillaries is measured by the differential pressure sensor ( The differential pressure signal is amplified by the amplifier circuit and then sent to the A/D converter and then sent to the microprocessor. The A/D converter and the microprocessor are conventional components in the control system), and then according to Poiseuille's law (P=KQη), And according to the same Q (volume flow rate) in the two capillaries, the formula can be deduced:

η _r =(1/K)(P ₂ /P ₁ );

Where: η _r is the relative viscosity, P ₁ is the pressure difference across the reference capillary, P ₂ is the pressure difference across the sample capillary, and K is the geometric constant of the capillary.

The microprocessor calculates the relative viscosity according to the formula. The formula is derived as follows:

According to Poiseuille's law: (P=KQη);

P ₁ =K ₁ Qη ₁ P ₁ : the pressure difference across the reference capillary;

P ₂ =K ₂ Qη ₂ P ₂ : the pressure difference at both ends of the sample capillary;

K ₁ =8L ₁ /лR ₁ ⁴ K ₁ : Geometric constant of the reference capillary;

K ₂ =8L ₂ /лR ₂ ⁴ K ₂ : the geometric constant of the sample capillary;

P ₂ /P ₁ =K ₂ Qη ₂ /K ₁ Qη ₁ =K ₂ η ₂ /K ₁ η ₁ =K(η ₂ /η ₁ ) K=K ₂ /K ₁ ;

η _r =1/K(P ₂ /P ₁ ) η _r =η ₂ /η ₁ (η _r : relative viscosity).

Working process: When the liquid-liquid isolator is filled with sample liquid, the solvent liquid in the air bag pneumatic pump flows into the capillary I and the liquid-liquid isolator under the action of air pressure, and the flexible diaphragm in the liquid-liquid isolator is Under the extrusion of the solvent liquid, it moves to the right and drives the sample liquid to flow to the capillary II. Due to the incompressibility of the liquid and the non-resistance transmission of the flexible diaphragm (the two liquids fill the inner cavity of the liquid-liquid separator), the two liquids are guaranteed to be in the same The flow rate flows (similar to a capacitor in a circuit). The role of the two Hall sensors is to determine where the flexible diaphragm moves to the ends.

The effect of the airbag type pneumatic pump is to send solvent into the capillary I and the liquid-liquid isolator, and simultaneously the solvent in the liquid-liquid isolator can also be sent back to the airbag type pneumatic pump (it is an original part of the present invention, when When the air pump is inflated, the liquid in the liquid storage chamber is squeezed out, and when the air is deflated, the liquid can flow back into the liquid storage chamber), which can realize the mutual flow of fluid between the air bag pneumatic pump and the liquid-liquid separator, which can Reusing the solvent provides assurance for realizing on-line automatic measurement, and can also save solvent. See Figure 4.

The function of the elastic air bag pneumatic pump is to send the sample in the sample bottle or the solvent in the solvent bottle into the liquid-liquid separator (it is an original part of the present invention, when the elastic air bag is inflated, the liquid in the liquid storage chamber is pumped out , when the elastic airbag elastically shrinks, the liquid is sucked in from the outside, and the liquid flow direction is determined by the one-way valve), which provides a guarantee for automatic liquid extraction. Due to the simple structure, it can be used for one time, and the cleaning of the pump can be omitted. See Figure 5.

The function of the switching solenoid valve is to control the flow direction of the fluid under the action of the control system, and the function of the reversing solenoid valve is to control the corresponding actions of the pneumatic system, the pneumatic pump and the pneumatic valve under the action of the control system, so as to complete automatic control such as liquid extraction and measurement. This is routine and readily accomplished by those skilled in the art.

Compared with the traditional capillary viscometer, the liquid-liquid isolation type capillary viscometer of the present invention has the following characteristics: because the liquid-liquid separator ensures that the flow velocity in the two capillaries is the same, it can calculate the viscosity (ηr) The Q item is accurately eliminated in the formula, so that the viscosity (ηr) value only depends on the pressure ratio, which can eliminate the influence of the pump fluctuation on the measurement accuracy, so that the measurement accuracy can be improved. Since the viscosity (ηr) only depends on the ratio of pressure, the detection of pressure is completed by the pressure sensor, and because the existing pressure sensor has high sensitivity and stability (the existing mature pressure sensor technology can fully meet our requirements for measurement accuracy ), therefore, we can obtain pressure parameters with high precision. Since the present invention can achieve synchronous measurement under the same temperature environment, when the viscosity (ηr) value only depends on the ratio of pressure, the influence of temperature is also eliminated, so it is less affected by temperature. Moreover, density correction is not required regardless of sample density (the density term is not included in the formula). Since the solvent can flow between the bladder-type pneumatic pump and the liquid-liquid isolator (conditions created by the liquid-liquid isolator and the bladder-type pneumatic pump), as long as the sample bottle is replaced by a liquid source for online measurement, it can be easily It is convenient to realize online automatic measurement. At present, in industrial systems such as petroleum, chemical industry, medicine, food, dyestuff, and rubber making, many process nodes urgently need automatic online and accurate monitoring of viscosity parameters as indicators to judge the extent to which various reactions are carried out and to automatically control the end of the reaction. . The implementation of this invention will bring revolutionary improvements to the production efficiency and product quality of the above-mentioned industrial systems (due to the realization of automatic on-line accurate monitoring of viscosity parameters, and then matching with existing mature automatic control equipment, it can be produced immediately. The above-mentioned related industrial systems urgently need automatic online accurate monitoring of viscosity parameters and automatic control equipment for automatic control of the production process), so the present invention has the characteristics of a high degree of automation. In addition, the present invention has the advantages of simple operation, convenient use, solvent saving, easy manufacture, simple structure, quick measurement, and low cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the measurement principle of the present invention.

Fig. 3 is a schematic structural view of the liquid-liquid separator of the present invention.

Fig. 4 is a schematic structural view of the airbag-type pneumatic pump of the present invention.

Fig. 5 is a structural schematic diagram of the elastic air bag type pneumatic pump of the present invention.

Among them, 1. Pneumatic system; 2. Reversing solenoid valve; 3. Driving circuit; 4. Amplifying circuit; 5. Control system; 6. Air bag pneumatic pump; 7. Pressure difference sensor I; 8. Pneumatic valve; Differential pressure sensor Ⅱ; 10. Manual reversing valve; 11. Liquid injection port Ⅰ; 12. Capillary Ⅰ; 13. Liquid-liquid isolator; 14. Capillary Ⅱ; ;17. Switch solenoid valve; 18. Manual liquid injector; 19. Liquid injection port II; 20. One-way valve; 21. Elastic air bag type pneumatic pump II; 22. Solvent bottle; 23. Housing; 24. Hall Sensor; 25. Flexible diaphragm; 26. Disc-shaped magnet; 27. Seal; 28. Liquid storage chamber; 29. Air bag; 30. Inflatable port; A, B, C, and D represent gas circuit connections, for example: there are two A in the figure, indicating that the two gas circuits are connected during work. g, h, J, K, and Q represent circuit connections, such as: there are two h in the figure, which represent the two circuit connections during work.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

A liquid-liquid isolation type capillary viscometer, comprising a sample bottle 15, a solvent bottle 22, a liquid-liquid isolator 13, a capillary I 12, a capillary II 14, a balloon-type pneumatic pump 6, a control system 5, and a pneumatic system 1, as shown in Figure 1 As shown, among them, the capillary I12, the liquid-liquid separator 13 and the capillary II14 are sequentially connected in pipelines, and the other end of the capillary I12 is connected with the air bag type pneumatic pump 6; There is a branch, and the sample bottle 15 and the solvent bottle 22 are respectively connected with the branch pipeline;

The two ends of the capillary I12 are provided with a differential pressure sensor I7, and the two ends of the capillary II14 are provided with a differential pressure sensor II9, and the two differential pressure sensors are respectively connected to the control system 5 through the amplifying circuit 4;

A pneumatic valve 8 is provided on the pipeline between the branch and the capillary II14;

A switching solenoid valve 17 is provided on the pipeline between the capillary I12 and the liquid-liquid separator 13;

A switching solenoid valve 17 is provided on the pipeline between the capillary II 14 and the pneumatic valve 8;

Hall sensors 24 at both ends of the liquid-liquid isolator 20 are connected to the control system 5 circuit;

A switching solenoid valve 17 is provided on the branch;

The pipeline connecting the sample bottle 15 and the branch is provided with an elastic airbag type pneumatic pump I16, and the pipelines on both sides of the elastic airbag type pneumatic pump I16 are respectively provided with a check valve 20;

The pipeline connecting the solvent bottle 22 and the branch is provided with an elastic air bag type pneumatic pump II 21, and the pipelines on both sides of the elastic air bag type air pump II 21 are respectively provided with a check valve 20;

The airbag type pneumatic pump 6 and the two elastic airbag type pneumatic pumps are all connected to the pneumatic system 1 through the reversing solenoid valve 2;

Both the switching solenoid valve 17 and the reversing solenoid valve 2 are electrically connected to the control system 5 through the driving circuit 3 .

The liquid-liquid isolator 20 includes a housing 23, each side of the housing 23 is provided with a Hall sensor 24, and the Hall sensor 24 is connected to the control system 5 circuit; the left side of the housing 23 is provided with a reference liquid inlet and outlet , the right side is provided with a sample liquid inlet and outlet; the housing 23 is provided with a flexible diaphragm 25, and the middle section of the flexible diaphragm 25 is provided with a disc-shaped magnet 26. As shown in Figure 3.

The housing 23 is composed of left and right parts connected by bolts, furthermore, a seal 27 is provided at the connection.

The air bag type pneumatic pump 6 includes a housing 23, a cavity is formed in the housing—a liquid storage chamber 28, an air bag 29 is arranged in the cavity, and an inflation port 30 is provided at the upper end of the housing 23, and the inflation port 30 is connected to the upper end of the cavity. The lower end of the housing 23 is provided with a liquid inlet and outlet 31, as shown in FIG. 4 .

The housing 23 is composed of upper and lower parts connected by bolts.

The lower end of the air bag type pneumatic pump 6 is also connected with a manual reversing valve 10, and the manual reversing valve 10 is provided with a liquid injection port I11;

The elastic air bag type pneumatic pump I16 includes a housing 23, and a cavity—a liquid storage chamber 28 is formed in the housing 23. An elastic air bag 32 is arranged in the cavity, and an inflation port 30 is provided at the upper end of the housing 23, and the inflation port 30 It communicates with the elastic air bag 32 , and the lower end of the casing 23 is provided with a liquid inlet and outlet 31 . The structure of the elastic air bag pneumatic pump I16 is similar to the air bag air pump 6, the only difference is that the air bag of the elastic air bag air pump I16 is elastic and can contract automatically when the gas pressure in the air bag is not high, as shown in Figure 5 . The structure of the elastic air bag type pneumatic pump II21 is the same as that of the elastic air bag type air pump I16.

The housing 23 is composed of upper and lower parts connected by bolts.

The branch road is also provided with a liquid injection port II 19, and a one-way valve 20 is provided at the liquid injection port 19 II. When in use, liquid can be manually injected into the liquid injection port II through the manual liquid injector 18.

Both the control system and the pneumatic system are conventional technologies in the prior art, and are easy to implement for those skilled in the art, and the present invention has no improvement on them, and will not be repeated here.

Working principle: Two capillary tubes are connected in series and a liquid-liquid separator 13 is set in the middle, so that the solvent liquid and the sample liquid flow in the pipeline at the same flow rate (but do not flow through the differential pressure sensor) and cannot be mixed at the same time . Two differential pressure sensors are respectively connected to the two ends of the two capillaries. When the two liquids flow through the two capillaries, a pressure drop is generated at the two ends of the two capillaries respectively, and the pressure difference between the two ends of the two capillaries is measured by the differential pressure sensor ( The differential pressure signal is amplified by the amplifier circuit and then sent to the A/D converter and then sent to the microprocessor. The A/D converter and the microprocessor are conventional components in the control system), and then according to Poiseuille's law (P=KQη), And according to the same Q (volume flow rate) in the two capillaries, the formula can be deduced:

η _r =(1/K)(P ₂ /P ₁ );

Wherein: η _r is the relative viscosity, P ₁ is the pressure difference across the reference capillary, P ₂ is the pressure difference across the sample capillary, and K is the geometric constant of the capillary, as shown in Figure 2.

The microprocessor calculates the relative viscosity according to the formula. The formula is derived as follows:

According to Poiseuille's law: (P=KQη);

P ₁ =K ₁ Qη ₁ P ₁ : the pressure difference at both ends of the reference capillary (capillary Ⅰ);

P ₂ =K ₂ Qη ₂ P ₂ : the pressure difference at both ends of the sample capillary (capillary II);

K ₁ =8L ₁ /лR ₁ ⁴ K ₁ : Geometric constant of the reference capillary;

K ₂ =8L ₂ /лR ₂ ⁴ K ₂ : the geometric constant of the sample capillary;

P ₂ /P ₁ =K ₂ Qη ₂ /K ₁ Qη ₁ =K ₂ η ₂ /K ₁ η ₁ =K(η ₂ /η ₁ )K=K ₂ /K ₁ ;

η _r =1/K(P ₂ /P ₁ ) η _r =η ₂ /η ₁ (η _r : relative viscosity).

Working process: when the liquid-liquid isolator 13 is filled with liquid, the solvent liquid in the balloon-type pneumatic pump 6 flows into the capillary I12 and the liquid-liquid isolator 13 under the action of air pressure, and the liquid-liquid isolator 13 The flexible diaphragm 25 moves rightward under the extrusion of the solvent liquid and drives the sample liquid to flow to the capillary II 14. Due to the incompressibility of the liquid and the non-resistance transmission of the flexible diaphragm 25 (the two liquids fill the inner cavity of the liquid-liquid separator 13), It is guaranteed that both liquids flow at the same flow rate. The function of the two Hall sensors 24 is to determine the position where the flexible diaphragm 25 moves to both ends.

The effect of bladder type pneumatic pump 6 is to send solvent into capillary I12 and liquid-liquid separator 13, and the solvent in liquid-liquid separator 13 can also be sent back in the bladder type pneumatic pump 6 simultaneously (be original invention of the present invention) Parts, when inflating the air bag 29, the liquid in the liquid storage chamber 28 is squeezed out, and the liquid can flow back into the liquid storage chamber 28 when deflated), it can realize the isolation of the fluid in the air bag type pneumatic pump 6 and the liquid-liquid The mutual flow among the devices 13 can make the solvent be used repeatedly, guarantee the realization of online automatic measurement, and save the solvent, as shown in FIG. 4 .

The effect of the elastic air bag type pneumatic pump is to send the sample in the sample bottle 15 or the solvent in the solvent bottle 22 into the liquid-liquid isolator 13 (it is an original part of the present invention, when the elastic air bag 32 is inflated, the liquid storage chamber 28 The liquid is pumped out, when the elastic airbag 32 is elastically contracted, the liquid is sucked in from the outside, and the flow direction of the liquid is determined by the one-way valve 20), which provides a guarantee for automatic liquid extraction. Due to the simple structure, it can be used at one time and saves the need for a Pump cleaning. See Figure 5.

The function of the switching solenoid valve 17 is to control the flow direction of the fluid under the action of the control system, and the reversing solenoid valve 2 controls the pneumatic system 1 and the pneumatic valve 8 to perform corresponding actions under the action of the control system 5 to complete automatic control such as liquid extraction and measurement. This is routine and readily accomplished by those skilled in the art.

Work steps:

(1) Empty the elastic air bag type pneumatic pump Ⅰ16 and elastic air bag type pneumatic pump II 21, and prepare for liquid suction at the same time: the control system 5 controls the corresponding solenoid valves (B, D) to switch on, and the pneumatic system 1 directs the elastic air bag type pneumatic pump Inflate Ⅰ16 and the elastic airbag type pneumatic pump Ⅱ21, and at the same time, the solenoid valve (k) on the branch road, the solenoid valve (Q) between the capillary Ⅱ14 and the pneumatic valve 8 is connected to discharge the gas.

(2) Empty the right chamber of the liquid-liquid isolator 13: the process is as follows: the control system 5 controls the corresponding solenoid valve (A) to be connected, the pneumatic system 1 inflates the air bag type pneumatic pump 6, and the air bag type pneumatic pump 6 is inflated. The solvent is pressed into the left chamber of the liquid-liquid isolator 13 (make the flexible diaphragm move to the right end to empty the right chamber of the liquid-liquid isolator, whether the flexible diaphragm moves to the right end is detected by the Hall sensor), and the corresponding solenoid valve (J, Q) connected to allow fluid flow.

(3) Inject the solvent into the liquid-liquid isolator 13: the process is as follows: the control system 5 controls the corresponding solenoid valves (C, D) to be connected, the pneumatic system 1 inflates the elastic air bag type pneumatic pump II 21 and the pneumatic valve 8, and at the same time The solenoid valves (J, k) of the solenoid valves (J, k) are connected to make the fluid circulate, and the solvent in the solvent bottle 22 enters the right chamber of the liquid-liquid isolator 13 under the action of the elastic airbag type pneumatic pump II21 (at the same time, the solvent in the left chamber of the liquid-liquid isolator is Squeeze back into the bladder-operated pump).

(4) Measuring the geometric constant K: the process is: the control system 5 controls the corresponding solenoid valve (A) to be turned on, the pneumatic system 1 inflates the airbag-type pneumatic pump 6, and the solvent in the airbag-type pneumatic pump 6 passes through under the action of air pressure Capillary I12 enters the left chamber of liquid-liquid separator 13, and at the same time, the solvent in the right chamber of liquid-liquid separator 13 is squeezed out and flows into capillary II14 to complete the measurement of K.

(5) Inject the sample into the liquid-liquid isolator 13: the process is as follows: the control system 5 controls the corresponding solenoid valves (B, C) to be switched on, the pneumatic system 1 inflates the elastic bladder type pneumatic pump I16 and the pneumatic valve 8, and at the same time The solenoid valves (J, k) of the valve are connected to make the fluid circulate, and the sample in the sample bottle 15 enters the right chamber of the liquid-liquid isolator 13 under the action of the elastic air bag type pneumatic pump I16, and the sampling is completed (at the same time, the liquid-liquid isolator The solvent in the left chamber is squeezed back into the bladder-operated pump).

(6) Measure the sample: the process is: the control system 5 controls the corresponding solenoid valve (A) to turn on, the pneumatic system 1 inflates the airbag pneumatic pump 6, and the solvent in the airbag pneumatic pump 6 passes through the capillary I12 under the action of air pressure. Enter the left chamber of the liquid-liquid isolator 13, while the sample in the right chamber of the liquid-liquid isolator 13 is squeezed out and flows into the capillary II14 to complete the measurement of the sample.

Claims (7)

1. isolated capillary viscosimeter of liquid-liquid; It is characterized in that: comprise sample bottle, solvent bottle, liquid-liquid isolator, kapillary I, kapillary II, gasbag-type air driven pump, control system, pneumatic system; Wherein, Kapillary I, liquid-liquid isolator are connected with kapillary II pipeline successively, and the other end of kapillary I is connected with the gasbag-type air driven pump; On liquid-liquid isolator and pipeline that the kapillary II is connected, be provided with branch road, sample bottle is connected with the branch road pipeline respectively with solvent bottle;

The two ends of said kapillary I, kapillary II are respectively equipped with a differential pressure pickup, and differential pressure pickup is connected with the control system circuit through amplifying circuit;

Pipeline between said branch road and the kapillary II is provided with operated pneumatic valve;

Pipeline between said kapillary I and liquid-liquid isolator is provided with switch electromagnetic valve;

Pipeline between said kapillary II and the pneumatic valve is provided with switch electromagnetic valve;

The Hall element at said liquid-liquid isolator two ends is connected with the control system circuit;

Said branch road is provided with switch electromagnetic valve;

The pipeline that said sample bottle is connected with branch road is provided with elastic bag formula air driven pump, respectively is provided with a retaining valve on the pipeline of elastic bag formula air driven pump both sides;

The pipeline that said solvent bottle is connected with branch road is provided with elastic bag formula air driven pump, respectively is provided with a retaining valve on the pipeline of elastic bag formula air driven pump both sides;

Said gasbag-type air driven pump, elastic bag formula air driven pump all are connected with pneumatic system through reversing solenoid valve;

Said switch electromagnetic valve all is connected with the control system circuit through driving circuit with reversing solenoid valve.

2. the isolated capillary viscosimeter of a kind of liquid-liquid according to claim 1 is characterized in that: said liquid-liquid isolator comprises housing, and the housing both sides respectively are provided with a Hall element, and Hall element is connected with the control system circuit; One side of housing is provided with the reference liquid entrance, and opposite side is provided with sample liquids and imports and exports; Be provided with flexible partition in the housing, the flexible partition stage casing is provided with disc magnet.

3. the isolated capillary viscosimeter of a kind of liquid-liquid according to claim 1; It is characterized in that: said gasbag-type air driven pump comprises housing; Cavity of formation in the housing--liquid storage cylinder, be provided with air bag in the cavity, the housing upper end is provided with inflation inlet; Inflation inlet is communicated with the cavity upper end, and the lower end of housing is provided with the liquid gateway.

4. the isolated capillary viscosimeter of a kind of liquid-liquid according to claim 1; It is characterized in that: said elastic bag formula air driven pump comprises housing; Form a cavity---liquid storage cylinder in the housing, be provided with elastic bag in the cavity, the housing upper end is provided with inflation inlet; Inflation inlet is communicated with elastic bag, and the lower end of housing is provided with the liquid gateway.

5. according to claim 2 or the isolated capillary viscosimeter of 3 or 4 described a kind of liquid-liquid, it is characterized in that: said housing is by constituting through bolted two parts.

6. the isolated capillary viscosimeter of a kind of liquid-liquid according to claim 1 is characterized in that: also be provided with liquid injection port on the said branch road, the liquid injection port place is provided with retaining valve.

7. the isolated capillary viscosimeter of a kind of liquid-liquid according to claim 1, it is characterized in that: the lower end of said gasbag-type air driven pump also is connected with the manual reverse of direction valve, and the manual reverse of direction valve is provided with liquid injection port.

Images