CN107884314B

CN107884314B - Ubbelohde viscometer

Info

Publication number: CN107884314B
Application number: CN201710856260.2A
Authority: CN
Inventors: 王震库
Original assignee: Hangzhou Zhenyue Technology Co ltd
Current assignee: Hangzhou Zhenyue Technology Co ltd
Priority date: 2017-09-21
Filing date: 2017-09-21
Publication date: 2020-05-22
Anticipated expiration: 2037-09-21
Also published as: CN107884314A

Abstract

The invention relates to the field of viscometers and discloses an Ubbelohde viscometer. The device comprises a liquid pumping and discharging pipe (3) and a measuring pipe (2), wherein a lower liquid storage ball (6) is connected below the liquid pumping and discharging pipe (3), a liquid inlet and discharging pipe (7) directly inserted into a sample bottle is communicated below the lower liquid storage ball (6), and the bottom of the measuring pipe (2) is communicated with the bottom of the lower liquid storage ball (6); one side of the measuring pipe (2) is connected with a vent pipe (1). The measuring tube (2) is sequentially connected with an upper liquid storage ball (12), a timing ball (11), a capillary tube (10) and a suspension liquid column ball (8) from top to bottom, and the suspension liquid column ball (8) is communicated with a liquid inlet and outlet tube (7) and a lower liquid storage ball (6). The viscometer has the advantages of accurate measurement, simple liquid recovery, easy automatic control, convenient cleaning and the like.

Description

Ubbelohde viscometer

Technical Field

The invention relates to the field of viscometers, in particular to a Ubbelohde viscometer.

Background

The Ubbelohde viscometer (see figure 2: traditional Ubbelohde viscometer) is mainly used for measuring the kinematic viscosity of liquid, is a gravity type capillary viscometer, measures the kinematic viscosity of the liquid according to the flowing time of a certain volume of the liquid from a capillary under the gravity drive, and compared with other U-shaped gravity viscometers, the Ubbelohde viscometer has an additional vent pipe and a suspension liquid column ball, forms a suspension liquid column during measurement so as not to be influenced by the amount of the added liquid and the liquid level in a liquid storage ball, has higher measurement precision (reaching 0.1 percent by manual measurement) than other gravity viscometers, and is widely applied. However, the three nozzles of the traditional Ubbelohde viscometer are all upward, and sample is added from the upper part and liquid is drained from the upper part. The waste liquid can pollute the whole area of three pipes when getting rid of to difficult to arrange completely, difficult sanitization still can spatter the human very unsafe, need consume a large amount of cleaning solvents during the washing, and have very high probability to wash unclean, cause the test inaccurate, be difficult to realize automatic application of sample and self-cleaning. Automated test instruments are extremely complex in construction and operation, require high corrosion resistance in materials, and are therefore very expensive. For a long time, fully automatic viscometers (including autosampler and autosurge) have been produced in only a few developed countries, and their market is monopolized by them, but with the rapid development of China, the demand is the highest worldwide. A large number of foreign exchanges flow to those developed countries. Some small and medium-sized enterprises generally cannot afford expensive full-automatic imported instruments, and the instruments are manually and semi-automatically operated, so that the enterprises are suffered from the toxicity of toxic organic solvent vapor and the complicated manual operation.

The invention patent of Chinese patent CN102809523A, entitled "a jacketed full-automatic Ubbelohde viscometer with bottom sample injection" adopts jacket design and has the advantage of bottom sample injection, but the method has the following defects that 1, the temperature influence is large when the temperature falls into a constant temperature environment each time is measured; 2. if the measurement is carried out in a lifting heat preservation mode, the measurement time is prolonged compared with the traditional measurement; 3. the structure is complex, so that the cleaning is unstable, sometimes the cleaning is difficult, and more reagents are wasted; 4. the upper expansion requires that residual liquid is remained in the container, and the container is detached and washed by liquid with higher corrosivity every week after use; 5. the automatic measurement has high failure rate and cannot meet the requirements of users; 6. temperature calibration is difficult.

Disclosure of Invention

Aiming at the defects of inconvenient cleaning, large measurement error, reagent waste and the like in the prior art, the invention provides the novel Ubbelohde viscometer which is convenient to sample, easy to clean, accurate in measurement and easy to automate.

In order to solve the technical problem, the invention is solved by the following technical scheme:

a Ubbelohde viscometer comprises a liquid pumping and discharging pipe and a measuring pipe, wherein a lower liquid storage ball is connected below the liquid pumping and discharging pipe, a liquid inlet and discharging pipe directly inserted into a sample bottle is communicated below the lower liquid storage ball, and the bottom of the measuring pipe is communicated with the bottom of the lower liquid storage ball; one side of the measuring pipe is connected with a blow-down pipe. The liquid pumping and discharging tube firstly pumps liquid to enable the liquid pumping and discharging tube to enter the lower liquid storage ball, continuously pumps bubbles in the lower liquid storage ball which can be discharged, and simultaneously has the function of uniformly stirring the liquid. And in the liquid discharging process, the liquid in the lower liquid storage ball directly flows back to the sample bottle through the liquid inlet and outlet pipe. The whole process has no sample liquid loss and is stable. And the volume of sample can be controlled to stock solution ball down to it is controllable to guarantee to carry out experimental sample liquid volume, guarantees the accuracy of experimental data.

Preferably, the liquid inlet and outlet pipe is provided with a liquid inlet and outlet channel, and the liquid inlet and outlet channel is directly inserted into the sample bottle.

Preferably, the measuring tube is connected with an upper liquid storage ball, a timing ball, a capillary tube and a suspension liquid column ball in sequence from top to bottom, and the suspension liquid column ball is communicated with the liquid inlet and outlet tube and the lower liquid storage ball.

Preferably, the inner bore radius of the capillary tube is smaller than the inner bore radius of the upper section of the measuring tube.

Preferably, one side of the measuring pipe is connected with a vent pipe, and the lower end of the vent pipe is communicated with the measuring pipe after being communicated with the suspension liquid column ball.

Preferably, an upper timing scale is arranged between the upper liquid storage ball and the timing ball, and a lower timing scale is arranged below the timing ball.

Preferably, the liquid pumping and discharging pipe is arranged on the right side of the measuring pipe, and the emptying pipe is arranged on the left side of the measuring pipe; the liquid inlet and outlet pipe is arranged below the measuring pipe and the liquid pumping and discharging pipe and is positioned between the measuring pipe and the liquid pumping and discharging pipe.

Preferably, a liquid blocking pipe is arranged in the liquid pumping and discharging pipe, the liquid blocking pipe is communicated with the liquid pumping and discharging pipe, and the liquid blocking pipe is positioned above the lower liquid storage ball. The liquid blocking pipe can retain liquid brought out by bubbles in the gas-liquid separation process in the lower liquid storage ball, so that the accuracy of the volume of a liquid sample is ensured.

Preferably, the lower liquid storage ball is provided with a liquid filling mark.

Preferably, the liquid inlet and outlet pipe is connected with a valve body for controlling the liquid to pass through, and the pipe orifice of the liquid pumping and discharging pipe is connected with a liquid pumping device and a liquid pushing device.

By adopting the technical scheme, the invention has the following beneficial effects:

1) directly draw the sample from the sample bottle, be applicable to the measurement liquid of any temperature, the sample test is finished and is finally turned back to the stoste in, all at one no loss, and the stoste can be retrieved and sealed up and keep up because the stoste does not obscure with other liquid, therefore the stoste can carry out simple purification and recycle, can reduce the emission of a lot of chemicals, accomplishes environmental protection resources are saved.

2) The liquid pumping and discharging tube realizes automatic measurement, cleaning and drying through actions of pumping, discharging, closing and opening of other tube openings and the like. Particularly, the liquid pumping and discharging pipe can carry out positive and negative pressure treatment during rinsing and emptying so as to quickly realize rinsing and emptying.

3) The cleaning solution can be recycled for many times, the use limit is always used, the cleaning solution can be cleaned (about 12ML) only by using a small amount of the cleaning solution, and the cleaning solution is very environment-friendly.

4) The invention does not change the measurement principle of the Ubbelohde viscosity at all, and compared with the traditional viscometer, the measured data is more stable and has more consistent repeatability.

5) The invention is convenient to produce and implement, only needs to absorb the customized sample amount during sample injection, and does not worry about the damage of the sample transmitted to the valve and the pump mechanism. During cleaning, the cleaning solution with the amount more than that of the sample (1 ML more) is used for extraction, and air is absorbed to generate mixing motion after the extraction so as to clean all the polluted area.

6) The invention is not customized by screw, and has no special algorithm, and the measuring and cleaning liquid can not be lost. The automatic cleaning device is a viscometer with low energy consumption, and the cleaning liquid does not need to be contacted with a human body and cannot leak out safely.

7) The test solution has small pollution area to the tube wall, is more convenient to clean and is easy to realize automation.

Drawings

FIG. 1 is a schematic diagram of the structure of a viscosity tube;

fig. 2 is a schematic view of the structure of a conventional viscometer.

The names of the parts indicated by the numerical references in the drawings are as follows: 1 emptying pipe, 2 measuring pipes, 3 pumping and discharging pipes, 4 liquid blocking pipes, 5 liquid filling marks, 6 lower liquid storage balls, 7 liquid inlet and discharging pipes, 8 suspension liquid column balls, 9 spherical covers, 10 capillary tubes, 11 timing balls, 12 upper liquid storage balls, MU lower timing scales, MO upper timing scales and 71 inlet and outlet channels.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1, an ubbelohde viscometer comprises a drainage tube 3 and a measuring tube 2, wherein a lower liquid storage ball 6 is connected below the drainage tube 3, a liquid inlet and outlet tube 7 directly inserted into a sample bottle is communicated below the lower liquid storage ball 6, and the bottom of the measuring tube 2 is communicated with the bottom of the lower liquid storage ball 6; one side of the measuring tube 2 is connected with a blow-down pipe 1. To further explain the structure of the liquid inlet/outlet tube 7, the liquid inlet/outlet tube 7 is provided with an inlet/outlet port passage 71, and the inlet/outlet port passage 71 is directly inserted into the sample bottle.

The measuring tube 2 is connected with an upper liquid storage ball 12, a timing ball 11, a capillary tube 10 and a suspension liquid column ball 8 in sequence from top to bottom, the suspension liquid column ball 8 comprises a spherical cover 9, and the suspension liquid column ball 8 is communicated with a liquid inlet and outlet tube 7 and a lower liquid storage ball 6. One side of the measuring pipe 2 is connected with a vent pipe 1, and the lower end of the vent pipe 1 is communicated with a suspension liquid column ball 8 and then communicated with the measuring pipe 2. An upper timing scale MO is arranged between the upper liquid storage ball 12 and the timing ball 11, and a lower timing scale MU is arranged below the timing ball 11; the liquid pumping and discharging pipe 3 is arranged on the right side of the measuring pipe 2, and the emptying pipe 1 is arranged on the left side of the measuring pipe 2; the liquid inlet and outlet pipe 7 is arranged below the measuring pipe 2 and the liquid discharge pipe 3 and is positioned between the measuring pipe 2 and the liquid discharge pipe 3; be provided with in the liquid drainage pipe 3 and keep off liquid pipe 4, keep off liquid pipe 4 and take out liquid pipe 3 and communicate with each other, keep off liquid pipe 4 and be located the top of stock solution ball 6 down, here keep off the structure of liquid pipe 4 and can overlap the nozzle stub in taking out liquid pipe 3, also can be the separation blade, as long as set up the opening in the middle part and can make its upside take out liquid pipe 3 and the 3 intercommunications of taking out liquid pipe of downside can. The lower liquid storage ball 6 is provided with a liquid filling mark 5. The inner bore radius of the capillary tube 10 is smaller than the inner bore radius of the upper section of the measuring tube 2.

The working principle of the viscometer is as follows: the lower part of the liquid inlet and outlet pipe 7 is connected with a valve body for controlling liquid to enter and exit, and the valve body is an electromagnetic valve which is easy to control. The liquid pumping and discharging tube is connected with a liquid pumping device and a liquid pushing device, and a liquid pumping pump and a liquid pushing pump are used. Of course, the solenoid valve could be replaced with a manual valve.

1. The emptying pipe 1 and the measuring pipe 2 are closed, the liquid pump is started to open the electromagnetic valves of the liquid pumping and discharging pipe 3 and the liquid inlet and discharging pipe 7, sample liquid enters the lower liquid storage ball 6 from the sample bottle through the liquid inlet and discharging pipe 7 and reaches the liquid filling mark 5, so that the volume stability of the extracted test liquid can be ensured, the sample liquid is stirred uniformly while air is continuously extracted to generate bubbles after extraction is completed, and the liquid blocking pipe 4 plays a role in blocking and recovering the sample liquid carried by the bubbles;

2. after the sample is subjected to constant temperature stabilization, closing an electromagnetic valve of a liquid inlet and outlet pipe 7, a liquid pumping pump of a liquid pumping and discharging pipe 3 and an electromagnetic valve, closing an emptying pipe 1, opening a measuring pipe 2, starting a liquid pushing pump to pressurize the interior of the liquid pumping and discharging pipe 3, so that sample liquid of a lower liquid storage ball 6 is pushed to an upper liquid storage ball 12 to wait for measurement;

3. and opening the emptying pipe 1, the measuring pipe 2 and the liquid pumping and discharging pipe 3, starting automatic timing by the sensor when the free falling body page of the sample passes through the upper measuring position MO, automatically stopping timing when the page passes through the lower measuring position MU, and calculating required data according to a related formula.

4. And opening the electromagnetic valve of the liquid inlet and outlet pipe 7 and the electromagnetic valve of the liquid pumping and discharging pipe 3, and returning the sample to the sample bottle through the liquid inlet and outlet pipe for sealing.

5. Go on according to above-mentioned principle during the washing, can wash safely quiet need not to think intervention can the sanitization, only need the cleaning solution that adds to add slightly more add the sample liquid, select to exceed 1ml ~ 2ml can, wash the completion back, the washing liquid is whole to retrieve to former bottle in through advancing fluid-discharge tube 7, the process environmental protection does not have the hourglass, and the operation is very simple, convenient moreover to can recycle this viscometer, the usable chemical technology of sample of retrieving purifies the recycle.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. The utility model provides an Ubbelohde viscometer, includes drainage tube (3) and surveys buret (2), its characterized in that: a lower liquid storage ball (6) is communicated below the liquid pumping and discharging pipe (3), a liquid inlet and discharging pipe (7) directly inserted into the sample bottle is communicated below the lower liquid storage ball (6), and the bottom of the measuring pipe (2) is communicated with the bottom of the lower liquid storage ball (6); one side of the measuring pipe (2) is connected with a blow-down pipe (1); the liquid inlet and outlet pipe (7) is provided with a liquid inlet and outlet channel (71), and the liquid inlet and outlet channel (71) is directly inserted into the sample bottle; the measuring tube (2) is sequentially connected with an upper liquid storage ball (12), a timing ball (11), a capillary tube (10) and a suspension liquid column ball (8) from top to bottom, and the suspension liquid column ball (8) is communicated with a liquid inlet and outlet tube (7) and a lower liquid storage ball (6); a liquid blocking pipe (4) is arranged in the liquid pumping and discharging pipe (3), the liquid blocking pipe (4) is communicated with the liquid pumping and discharging pipe (3), and the liquid blocking pipe (4) is positioned above the lower liquid storage ball (6).

2. The Ubbelohde viscometer of claim 1, wherein: the inner bore radius of the capillary tube (10) is smaller than the inner bore radius of the upper section of the measuring tube (2).

3. The Ubbelohde viscometer of claim 1, wherein: one side of the measuring pipe (2) is connected with a vent pipe (1), and the lower end of the vent pipe (1) is communicated with a suspension liquid column ball (8) and then communicated with the measuring pipe (2).

4. The Ubbelohde viscometer of claim 1, wherein: an upper timing scale is arranged between the upper liquid storage ball (12) and the timing ball (11), and a lower timing scale is arranged below the timing ball (11).

5. The Ubbelohde viscometer of claim 1, wherein: the liquid pumping and discharging pipe (3) is arranged on the right side of the measuring pipe (2), and the emptying pipe (1) is arranged on the left side of the measuring pipe (2); the liquid inlet and outlet pipe (7) is arranged below the measuring pipe (2) and the liquid pumping and discharging pipe (3) and is positioned between the measuring pipe (2) and the liquid pumping and discharging pipe (3).

6. The Ubbelohde viscometer of claim 1, wherein: the lower liquid storage ball (6) is provided with a liquid filling mark (5).

7. The Ubbelohde viscometer of claim 1, wherein: the liquid inlet and outlet pipe (7) is connected with a valve body for controlling liquid to pass through, and the pipe orifice of the liquid pumping and discharging pipe (3) is connected with a liquid pumping device and a liquid pushing device.