CN212989098U

CN212989098U - Liquid kinematic viscosity measuring device convenient to wash

Info

Publication number: CN212989098U
Application number: CN202021049122.7U
Authority: CN
Inventors: 贾丽斯; 赖立强; 唐秋丽; 于成英; 王浩楠
Original assignee: Guangxi University Xingjian College of Science and Liberal Arts
Current assignee: Guangxi University Xingjian College of Science and Liberal Arts
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-04-16
Anticipated expiration: 2030-06-09

Abstract

The utility model provides a liquid kinematic viscosity measuring device convenient to clean, which comprises a capillary tube, a first laser sensor, a second laser sensor and a timing device; the capillary tube comprises a wide tube and a narrow tube, a positive pressure tube and a negative pressure tube which are connected with the wide tube, a first plug arranged at the upper end of the wide tube, a second plug arranged at the upper end of the narrow tube, and a one-way valve and a liquid inlet which are sequentially arranged at the lower end of the capillary tube along the downward direction; the wide pipe and the narrow pipe are both straight pipes, the wide pipe and the narrow pipe are intersected, and the flow direction of the check valve is from bottom to top; the utility model discloses the structure is simplified, and the measurement process is simple, and capillary washs convenient and fast.

Description

Liquid kinematic viscosity measuring device convenient to wash

Technical Field

The utility model relates to a belong to fluid viscosity and measure technical field, especially relate to a liquid kinematic viscosity measuring device convenient to wash.

Background

The determination of the liquid viscosity coefficient is a classic routine experiment in the fluid mechanics field in the university materialization experiment, the fluid viscosity is a measure of the internal friction existing when adjacent fluid layers move at different speeds, and the liquid viscosity is measured by a glass capillary viscometer commonly used in a chemical laboratory. At present, capillary viscometers (e.g., an austenitic viscometer and an ubbelohde viscometer) are widely used for measuring the viscosity of a liquid in instrumental analysis and industrial fields. In the prior art, the viscosity measurement operation steps are complex, and the capillary tube is difficult to clean.

For example, chinese patent CN106896037A discloses an automatic measuring device of capillary viscometer of system, which comprises an ultrasonic generating device and a deslagging filtering device connected by a degassing pipeline, wherein the outlet of the deslagging filtering device is provided with a flow valve, and the flow valve is connected with the capillary viscometer; the position of the measuring ball marking of the capillary viscometer is provided with a laser sensor which is connected with a timing device.

The capillary that above-mentioned device adopted adopts traditional mode to wash, and the bottom is the U-shaped structure, and is inconvenient to wash with the brush, and measurement process is comparatively complicated.

Disclosure of Invention

The utility model provides a liquid kinematic viscosity measuring device convenient to wash, the structure is simplified, and the measurement process is simple, and the capillary washs convenient and fast.

A liquid kinematic viscosity measuring device convenient to clean comprises a capillary tube, a first laser sensor, a second laser sensor and a timing device; the capillary tube comprises a wide tube and a narrow tube, and further comprises a lower accumulator arranged on the wide tube and an upper accumulator arranged on the narrow tube, wherein a first laser sensor is arranged on the central tube wall of the upper accumulator, a second laser sensor is arranged on the tube wall below the upper accumulator, the first laser sensor and the second laser sensor are both electrically connected with the timing device, the capillary tube further comprises a positive pressure tube and a negative pressure tube which are connected with the wide tube, a first plug arranged at the upper end of the wide tube and a second plug arranged at the upper end of the narrow tube, and the lower end of the capillary tube is sequentially provided with a one-way valve and a liquid inlet along the downward direction; the wide pipe with the narrow pipe all sets up to the straight tube, the wide pipe with the narrow pipe is crossing, check valve flow direction is from up down.

The utility model discloses a two sections pipe formation capillary that the straight tube is connected, cancelled the U-shaped tubular structure, make things convenient for the brush to wash in inserting the straight tube, it is more convenient to wash.

The utility model discloses a capillary pressurization is given to just pressure pipe and negative pressure pipe, cooperates the switching of first end cap and second end cap, controls the flow of the liquid that awaits measuring, and convenient operation also conveniently controls the washing liquid and flows in the capillary when wasing, is convenient for wash.

The utility model discloses a check valve structure extracts the liquid that awaits measuring from the bottom, simple structure, and convenient operation has guaranteed that the liquid that awaits measuring can not flow the seepage

Preferably, the wide tube with the crossing angle of narrow pipe is 15 ~ 20, makes things convenient for the brush to get into the pipeline and washs at this angle scope, guarantees simultaneously that sufficient interval makes things convenient for the switching operation of first end cap and second end cap, and makes capillary compact structure, and occupation space is little.

Preferably, the positive pressure pipe is connected with the first air compressor through a first valve, the negative pressure pipe is connected with the second air compressor through a second valve, and the two pipelines are divided into two pipelines to apply positive pressure and negative pressure to the wide pipe, so that the control is more accurate.

Preferably, the first plug and the second plug are both rubber plug structures, and the structure is simple and convenient to operate.

Preferably, the first plug and the second plug are both screw plugs provided with internal threads, the upper ends of the wide pipe and the narrow pipe are both provided with external threads, when liquid with high viscosity is measured, high positive pressure and negative pressure are needed, the pipeline can be guaranteed to be good in air tightness due to the fact that the wide pipe and the narrow pipe are connected through a threaded structure, and measuring accuracy is improved.

Preferably, the upper reservoir includes two upper and lower measuring balls, the first laser sensor is disposed between the two measuring balls, and the second laser sensor is disposed below the measuring balls.

The utility model has the advantages that:

1. the two sections of tubes connected by the straight tube form the capillary tube, namely the wide tube is directly connected with the narrow tube, so that a U-shaped tube structure is omitted, the brush can be conveniently inserted into the straight tube for cleaning, and the cleaning is more convenient.

2. The measurement is convenient, the capillary tube is pressurized by adopting the positive pressure tube and the negative pressure tube, and the flow of the liquid to be measured is controlled by matching the opening and closing of the first plug and the second plug, so that the operation is convenient;

3. the washing is convenient, after the measurement, passes through the check valve from the bottom again and extracts the washing liquid, then through applying positive negative pressure repeatedly, conveniently controls the washing liquid and makes a round trip to flow in the capillary for the liquid that remains in the pipeline dilutes, is convenient for wash.

Drawings

Fig. 1 is a schematic structural diagram of a kinematic viscosity measuring device for liquid convenient to clean according to the present invention.

Fig. 2 is a diagram of the installation positions of the first laser sensor and the second laser sensor according to the present invention.

Fig. 3 is a structural diagram of a second plug according to embodiment 2 of the present invention, and fig. 4 is a schematic structural diagram of the second plug according to embodiment 3 of the present invention.

In the figure: 1-capillary tube, 101-wide tube, 102-narrow tube, 103-lower reservoir, 104-upper reservoir, 2-first laser sensor, 3-second laser sensor, 4-timing device, 5-positive pressure tube, 6-negative pressure tube, 7-first plug, 8-second plug, 9-liquid inlet, 10-one-way valve, 11-first valve, 12-second valve, 13-first air compressor, 14-second air compressor.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments, which are illustrative of the invention and are not to be construed as unduly limiting the invention.

In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply specific orientations, configurations and operations that the device or structure referred to must have, and therefore should not be construed as limiting the present invention.

Example 1:

as shown in fig. 1 and 2, a liquid kinematic viscosity measuring device convenient to clean comprises a capillary 1, a first laser sensor 2, a second laser sensor 3, a timing device 4; the capillary tube 1 comprises a wide tube 101 and a narrow tube 102, and further comprises a lower reservoir 103 arranged on the wide tube 101 and an upper reservoir 104 arranged on the narrow tube 102, wherein a first laser sensor 2 is arranged on the central tube wall of the upper reservoir 104, a second laser sensor 3 is arranged on the tube wall below the upper reservoir 104, the first laser sensor 2 and the second laser sensor 3 are both electrically connected with the timing device 4, the capillary tube further comprises a positive pressure tube 5 and a negative pressure tube 6 which are connected with the wide tube 101, a first plug 7 arranged at the upper end of the wide tube 101 and a second plug 8 arranged at the upper end of the narrow tube 102, and the lower end of the capillary tube 1 is sequentially provided with a one-way valve 10 and a liquid inlet 9 along the downward direction; the wide pipe 101 and the narrow pipe 102 are both straight pipes, the wide pipe 101 and the narrow pipe 102 are intersected, and the flow direction of the check valve 10 is from bottom to top.

The measurement method of this example is as follows:

first, the measuring device is vertically placed in a constant temperature bath, the first plug 7 and the second plug 8 are opened, and the wide pipe 101 and the narrow pipe 102 are communicated with the atmosphere.

When a sample is sucked, the liquid inlet 9 is inserted into a test tube, the second choke plug 8 hermetically seals the narrow tube 102, the first choke plug 7 is still opened to communicate the wide tube 101 with the atmosphere, and then the negative pressure tube 6 is communicated, so that liquid to be detected in the test tube is sucked into the lower reservoir 103 in the wide tube 101 through the liquid inlet 9 and the one-way valve 10 by negative pressure;

the negative pressure pipe 6 is disconnected, the first plug 7 plugs the wide pipe 101, the second plug 8 is opened to enable the narrow pipe 102 to be communicated with the atmosphere, then the positive pressure pipe 5 is connected, and positive pressure is provided to enable liquid to be measured to flow from the bottom of the capillary 1 to the upper storage and exceed the height position of the first laser sensor 2;

and (3) disconnecting the normal pressure pipe 5, opening the first plug 7 and the second plug 8, and connecting the wide pipe 101 and the narrow pipe 102 with the atmosphere, so that the liquid to be measured in the narrow pipe 102 naturally flows down under the action of gravity. Recording time points when the liquid level of the liquid to be measured descends to the positions of the first laser sensor 2 and the second laser sensor 3, transmitting the time point data to the timing device 4 by the positions of the first laser sensor 2 and the second laser sensor 3, calculating a time difference delta t by the timing device 4, repeating the steps for 3 times, and taking an average time difference value.

The kinematic viscosity of the liquid is calculated, the known viscosity of the liquid, such as water, is used as a known value, the measurement time difference of the water is measured in advance by adopting the method, then a coefficient is obtained by calculation, and the viscosity of the liquid to be measured can be obtained by multiplying the time difference delta t by the coefficient.

The whole measuring process realizes full-automatic measurement, time when measuring personnel manually record liquid flowing through a measuring point through naked eyes is not needed, and efficiency and precision are improved.

The cleaning method of the capillary tube 1 of the utility model is as follows: when cleaning, the second plug 8 is closed, the first plug 7 is opened, the negative pressure pipe 6 is connected, cleaning liquid is sucked into the wide pipe 101 from the liquid inlet 9 by negative pressure, then the negative pressure pipe 6 is disconnected, the positive pressure pipe 5 is connected, the cleaning liquid is blown into the narrow pipe 102 from the wide pipe 101 until the cleaning liquid is blown onto the upper portion of the upper reservoir 104, then the negative pressure pipe 6 is connected in a switching mode, the circulation is repeated for a plurality of times, after the liquid residues to be detected are cleaned and diluted, the positive pressure pipe 5 is connected, the cleaning liquid is blown out of the upper end of the narrow pipe 102, then dry air is continuously added into the positive pressure pipe 5, and the cleaning of the capillary 1.

In this embodiment, the capillary 1 can be removed and the brushes can be inserted into the wide tube 101 and the narrow tube 102 for cleaning, because the capillary 1 has no bent portion, the brushes can be easily inserted and the cleaning is simple.

Example 2:

as shown in FIG. 1, a liquid kinematic viscosity measuring device convenient to clean comprises a capillary 1, a first laser sensor 2, a second laser sensor 3 and a timing device 4; capillary 1 includes wide pipe 101 and narrow pipe 102, still including setting up lower reservoir 103 on the wide pipe 101 is in with the setting last reservoir 104 on the narrow pipe 102, first laser sensor 2 sets up on going up the central pipe wall of reservoir 104, second laser sensor 3 sets up on going up the pipe wall of reservoir 104 below, first laser sensor 2 and second laser sensor 3 all with timing device 4 electric connection, the utility model discloses a timing device 4 adopts the OHR-B200 series time-recorder of Fujian shunchang runing precision instruments limited production.

The embodiment also comprises a positive pressure pipe 5 and a negative pressure pipe 6 which are connected with the wide pipe 101, a first plug 7 arranged at the upper end of the wide pipe 101, a second plug 8 arranged at the upper end of the narrow pipe 102, and a one-way valve 10 and a liquid inlet 9 which are sequentially arranged at the lower end of the capillary 1 along the downward direction; the wide pipe 101 and the narrow pipe 102 are both straight pipes, the wide pipe 101 and the narrow pipe 102 are intersected, and the flow direction of the check valve 10 is from bottom to top.

The crossing angle of the wide tube 101 and the narrow tube 102 is 15-20 degrees, the range of the angle facilitates the brush to enter the pipeline for cleaning, meanwhile, enough space is guaranteed to facilitate the opening and closing operation of the first plug 7 and the second plug 8, and the capillary tube 1 is compact in structure and small in occupied space.

The positive pressure pipe 5 is connected with a first air compressor 13 through a first valve 11, the negative pressure pipe 6 is connected with a second air compressor 14 through a second valve 12, two pipelines are divided to add positive pressure and negative pressure to the wide pipe 101, and control is more accurate.

As shown in fig. 3, this embodiment is used for measuring the liquid that viscosity is less, and consequently the sealing pressure requirement to the pipe is not big, first end cap 7 with second end cap 8 is rubber buffer structure, simple structure, saves cost, convenient operation.

As shown in fig. 2, the upper reservoir 104 includes two upper and lower measuring balls, the first laser sensor 2 is disposed between the two measuring balls, and the second laser sensor 3 is disposed below the lower measuring ball.

The measurement method and the capillary 1 cleaning method of this embodiment are the same as those of embodiment 1, and are not described again.

Example 3:

as shown in fig. 4, the present embodiment is different from embodiment 2 described above in that:

this embodiment is used for measuring the great liquid of viscosity, first end cap 7 with second end cap 8 is the plug screw that is provided with interior screw thread, and the top is sealed, wide pipe 101 with narrow pipe 102 upper end all is provided with outer screw thread, guarantees sealedly through rotatory plug screw and pipe end connection, when measuring the great liquid of viscosity, needs great positive pressure and negative pressure, and it is good to adopt the gas tightness that the helicitic texture connects can guarantee the pipeline, improves measurement accuracy.

Claims

1. A liquid kinematic viscosity measuring device convenient to clean comprises a capillary tube (1), a first laser sensor (2), a second laser sensor (3) and a timing device (4); capillary (1) is including wide pipe (101) and narrow pipe (102), still including setting up lower accumulator (103) on wide pipe (101) are in with setting up last accumulator (104) on narrow pipe (102), first laser sensor (2) set up on the central pipe wall of last accumulator (104), second laser sensor (3) set up on the pipe wall of last accumulator (104) below, first laser sensor (2) and second laser sensor (3) all with timing device (4) electric connection, its characterized in that: the device is characterized by further comprising a positive pressure pipe (5) and a negative pressure pipe (6) which are connected with the wide pipe (101), a first plug (7) arranged at the upper end of the wide pipe (101), and a second plug (8) arranged at the upper end of the narrow pipe (102), wherein the lower end of the capillary pipe (1) is sequentially provided with a one-way valve (10) and a liquid inlet (9) along the downward direction; the wide pipe (101) and the narrow pipe (102) are both straight pipes, the wide pipe (101) and the narrow pipe (102) are intersected, and the flow direction of the one-way valve (10) is from bottom to top.

2. A liquid kinematic viscosity measuring device that is easy to clean, according to claim 1, characterized in that: the intersection angle of the wide pipe (101) and the narrow pipe (102) is 15-20 degrees.

3. A cleaning-facilitating kinematic viscosity measurement device for liquids according to claim 1 or 2, characterized in that: the positive pressure pipe (5) is connected with a first air compressor (13) through a first valve (11), and the negative pressure pipe (6) is connected with a second air compressor (14) through a second valve (12).

4. A cleaning-facilitating kinematic viscosity measurement device for liquids according to claim 1 or 2, characterized in that: the first plug (7) and the second plug (8) are both rubber plug structures.

5. A cleaning-facilitating kinematic viscosity measurement device for liquids according to claim 1 or 2, characterized in that: the first plug (7) and the second plug (8) are both screw plugs provided with internal threads, and the upper ends of the wide pipe (101) and the narrow pipe (102) are both provided with external threads.

6. A cleaning-facilitating kinematic viscosity measurement device for liquids according to claim 1 or 2, characterized in that: the upper accumulator (104) comprises an upper measuring ball and a lower measuring ball, the first laser sensor (2) is arranged between the two measuring balls, and the second laser sensor (3) is arranged at the lower part of the measuring ball below.