KR102034540B1 - Viscometer - Google Patents

Abstract

Viscometers are disclosed.
According to an embodiment of the present invention, a viscometer may include a first chamber through which a reference fluid of known viscosity moves from a first fluid source through a first capillary tube, and a second capillary tube having the same shape as the first capillary tube from a second fluid source. A main pipette having at least one second chamber having the same shape as the first chamber through which the measurement fluid to measure the viscosity is moved; And a pressure supply device supplying pressure to the first chamber and the second chamber.

Description

Viscometer {VISCOMETER}

The present invention relates to a viscometer, and more particularly, to a viscometer that can easily measure the viscosity of the fluid.

Viscosity of blood is an important blood rheological parameter that affects blood flow and blood circulation.

Elevated viscosity of blood is associated with several pathological conditions such as cardiovascular disease, diabetes, and Alzheimer's disease. In this condition, decreased blood flow can affect vascular complications and impaired tissue perfusion, so monitoring the viscosity of blood is clinically important for diagnosing disease and evaluating treatment response. .

As such, various viscometers have been developed for measuring the viscosity characteristics of fluids such as blood. However, the viscometer according to the prior art is bulky and expensive equipment, and the operation is very complicated.

Therefore, the demand for the viscometer which is simple in structure and can measure a viscosity correctly is increasing.

Matters described in this Background section are intended to enhance the understanding of the background of the invention, and may include matters other than the prior art already known to those skilled in the art.

The present invention has been made to solve the above problems, and an object thereof is to provide a viscometer with a simple structure and capable of accurately measuring viscosity.

Viscometer according to an embodiment of the present invention for achieving the above object is a first chamber through which a reference fluid of known viscosity moves from a first fluid source through a first capillary tube, and the first capillary tube from a second fluid source A main pipette having at least one second chamber having the same shape as the first chamber through which a measurement fluid to measure viscosity is moved through a second capillary tube having the same shape as the first pipe; And a pressure supply device supplying pressure to the first chamber and the second chamber.

A pressure supply port is formed at an upper portion of the main pipette to communicate with the first chamber and the second chamber, and the pressure supply device may supply pressure to the first chamber and the second chamber through the pressure supply port. have.

Scales may be formed on the inner side or the outer side of the main pipette corresponding to the first chamber and the second chamber at regular intervals.

Viscosity (μref) of the reference fluid, the amount of movement of the reference fluid (nref) when the positive pressure is applied to the first chamber after applying a negative pressure to the first chamber through the pressure supply device, and through the pressure supply device The controller may further include a controller configured to calculate a viscosity of the measurement fluid from a test amount ntest of the measurement fluid when a negative pressure is applied to the second chamber and then a positive pressure is applied to the second chamber.

의 수학식을 통해 상기 측정 유체의 점도를 계산하고, 여기서, μtest는 측정 유체의 점도, μref는 기준 유체의 점도, nref는 기준 유체의 이동량, 및 ntest는 측정 유체의 이동량일 수 있다.The controller

The viscosity of the measurement fluid is calculated through the equation, wherein μtest may be the viscosity of the measurement fluid, μref may be the viscosity of the reference fluid, nref may be the movement amount of the reference fluid, and ntest may be the movement amount of the measurement fluid.

The first chamber may be connected in series with the first capillary tube, and the second chamber may be connected in series with the second capillary tube.

The expansion pipette is coupled to the connector formed in the main pipette, the expansion pipe is formed to form an expansion chamber to move another measuring fluid to measure the viscosity from another fluid source through the expansion capillary tube.

The expansion chamber is formed in the same shape as the first chamber and the second chamber, the expansion capillary is formed in the same shape as the first capillary and the second capillary, the expansion chamber is the first through the connector It may be in communication with the first chamber and the second chamber.

The expansion pipette may be formed with another expansion connector for connecting with another expansion pipette.

The expansion pipette is formed with an expansion opening in communication with the expansion chamber, an expansion protrusion is formed protruding around the expansion opening, the expansion protrusion may be coupled to the connection by pressing.

Connection protrusions protrude from the periphery of the connector, threads are formed on the outer circumferential surface of the connection protrusion, and expansion pipettes are formed in communication with the expansion chamber, and expansion protrusions protrude from the expansion pipe. The expansion protrusion may be provided with an extension nut for screwing the connection protrusion and the screw.

It may further include an air chamber provided between the main pipette and the pressure supply device.

According to another embodiment of the present invention, a viscometer includes a first chamber through which a reference fluid of known viscosity moves from a first fluid source through a first capillary tube, and a measurement fluid to measure viscosity through a second capillary tube from a second fluid source A main pipette in which at least one second chamber is moved; A pressure supply device for supplying pressure to the first chamber and the second chamber; A detector configured to measure a movement amount of the fluid flowing through the first chamber and the second chamber; And a controller that calculates a viscosity of the measurement fluid based on the amount of movement of the fluid flowing through the first chamber and the second chamber sensed by the sensing unit.

A pressure supply port is formed at an upper portion of the main pipette to communicate with the first chamber and the second chamber, and the pressure supply device may supply pressure to the first chamber and the second chamber through the pressure supply port. have.

The controller may supply a viscosity (μref) of the reference fluid, a moving amount nref of the reference fluid when a positive pressure is applied to the first chamber after applying a negative pressure to the first chamber through the pressure supply device, and the pressure supply. The viscosity of the measurement fluid may be calculated from the ntest of the measurement fluid when a negative pressure is applied to the second chamber and then a positive pressure is applied to the second chamber through the device.

의 수학식을 통해 측정 유체의 점도를 계산하고, 여기서, μtest는 측정 유체의 점도, μref는 기준 유체의 점도, nref는 기준 유체의 이동량, 및 ntest는 측정 유체의 이동량일 수 있다.The controller

Calculate the viscosity of the measurement fluid through the equation, wherein μtest may be the viscosity of the measurement fluid, μref is the viscosity of the reference fluid, nref is the amount of movement of the reference fluid, and ntest is the amount of movement of the measurement fluid.

The viscosity of the measurement fluid can be calculated from the viscosity and the amount of movement of the reference fluid and the amount of movement of the measurement fluid of which the viscosity according to the embodiment of the present invention as described above is known.

In addition, since the viscosity of the measurement fluid can be measured through simple calculation, the structure of the viscometer can be easily implemented.

In addition, since the expansion pipettes can be connected in parallel so as to measure the movement amount of the plurality of measurement fluids, the viscosity of the measurement fluids can be simultaneously calculated.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a view showing the configuration of a viscometer according to an embodiment of the present invention.
2 is a view showing the configuration of a viscometer according to another embodiment of the present invention.
3 is a view showing the configuration of a viscometer according to another embodiment of the present invention.
4 is a view showing the configuration of a viscometer according to another embodiment of the present invention.
5 is a view showing the configuration of a viscometer according to another embodiment of the present invention.
6 is a view showing the configuration of a viscometer according to another embodiment of the present invention.
7 and 8 are views for explaining a method of measuring the viscosity of the fluid through a viscometer according to an embodiment of the present invention.
9 is a graph showing the relationship between the diameter of the capillary tube and ΔP.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

Hereinafter, a viscometer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a viscometer according to an embodiment of the present invention.

As shown in FIG. 1, the viscometer according to the embodiment of the present invention has a first capillary 110 and a first chamber 112 through which a reference fluid flows, and a second capillary tube through which a measurement fluid flows. 120 and a main pipette 100 in which the second chamber 122 is formed, and a pressure supply device 200 for supplying pressure to the first chamber 112 and the second chamber 122.

The first chamber 112 and the first capillary tube 110 are connected in parallel with the second chamber 122 and the second capillary tube 120. The first capillary 110 is connected in series with the first chamber 112, and the second capillary 120 is connected in series with the second chamber 122. The first capillary tube 110 and the second capillary tube 120 have the same shape, and the first chamber 112 and the second chamber 122 have the same shape.

The first capillary tube 110 and the second capillary tube 120 have a diameter small enough to allow a capillary phenomenon to occur, and the first chamber 112 and the second chamber 122 have the first capillary tube 110. ) And the diameter of the second capillary tube 120 is sufficiently large.

The first capillary 110 is connected to a first fluid source in which a reference fluid of known viscosity is stored. The second capillary tube 120 is connected to a second fluid source in which a measurement fluid to be measured is stored.

The pressure supply device 200 is formed on an upper portion of the main pipette 100 and through the pressure supply port 130 communicating with the first chamber 112 and the second chamber 122 connected in parallel. Pressure (static pressure and negative pressure) is supplied to the first chamber 112 and the second chamber 122.

The pressure supply device 200 may be a piston (eg, a syringe) that can be operated manually. However, the scope of the present invention is not limited thereto, and any device capable of applying pressure to the chambers may be used.

When a negative pressure (pressure for sucking fluid from the fluid source into the capillary tube and the chamber) is applied to the first chamber 112 and the second chamber 122 through the pressure supply device 200, the capillary tube and the chamber The fluid moves upward along.

When a positive pressure (pressure for pushing fluid filled in the chamber and the capillary to the fluid source) is applied to the first chamber 112 and the second chamber 122 through the pressure supply device 200, the capillary and the chamber The fluid moves downward along.

On the inner side or the outer side of the main pipette 100, a scale for measuring the movement amount of the reference fluid and the measurement fluid is formed at regular intervals at positions corresponding to the first chamber 112 and the second chamber 122. do.

The viscosity of the measurement fluid is a viscosity (μref) of the reference fluid, when a positive pressure is applied to the first chamber 112 after applying a negative pressure to the first chamber 112 through the pressure supply device 200 The movement amount ntest of the reference fluid and the movement amount ntest of the measurement fluid when a positive pressure is applied to the second chamber 122 after applying a negative pressure to the second chamber 122 through the pressure supply device 200. Can be calculated from The movement amount nref of the reference fluid and the movement amount ntest of the measurement fluid may be measured by reading a scale formed on the main pipette 100.

Specifically, the viscosity of the measuring fluid may be calculated from Equation 1 below.

[Equation 1]

In Equation 1, μtest is the viscosity of the measurement fluid, μref is the viscosity of the reference fluid, nref is the movement amount of the reference fluid, and ntest is the movement amount of the measurement fluid.

2 is a view showing the configuration of a viscometer according to another embodiment of the present invention.

The viscometer shown in FIG. 1 includes a first capillary tube 110 and a first chamber 112 through which a reference fluid moves, and a second capillary tube 120 and a second chamber 122 through which the measurement fluid moves. An example has been described.

However, as shown in Figure 2, the viscometer according to an embodiment of the present invention may be formed with a plurality of capillaries and chambers through which the measurement fluid flows.

That is, the embodiment shown in FIG. 2 is basically the same as the viscometer shown in FIG. 1. However, only a plurality of capillaries and a plurality of chambers through which the measurement fluid can move are formed.

3 is a view showing the configuration of a viscometer according to another embodiment of the present invention.

As shown in FIG. 3, the viscometer according to another embodiment of the present invention has the same basic configuration as the viscometer shown in FIG. 1. However, there is a difference in that an air chamber is provided between the pressure supply device 200 and the main pipette 100.

In the case of non-Newtonian fluids, the viscosity of the fluid changes with the shear rate. The shear rate changes with the volumetric flow rates of the fluid, and the volumetric flow rate changes with the pressure change.

Therefore, when the pressure supply device 200 does not supply a constant pressure to the reference fluid and the measurement fluid such as a syringe, it is not possible to accurately measure the viscosity of the non-Newtonian fluid. In order to solve this problem, by providing an air chamber between the pressure supply device 200 and the main pipette 100, the first chamber 112 and the second chamber of the main pipette 100 from the pressure supply device 200. Constant pressure may be supplied to 122.

At this time, the air chamber serves as a kind of buffer, thereby supplying a constant pressure from the pressure supply device 200 to the first chamber 112 and the second chamber 122 of the main pipette 100.

In order for the air chamber to function as a buffer, the volume V2 of the air chamber and the volume V1 to which the plunger of the syringe moves are in the first chamber 112 and the second chamber 122 of the main pipette 100. It is preferred that the fluid be set sufficiently large (e.g. 10 times) than the volume V3 at which the fluid moves.

However, if the pressure supply device 200 is operated electronically or mechanically to supply a constant pressure to the first chamber 112 and the second chamber 122 of the main pipette 100, it is not necessary to have an air chamber. .

4 is a view showing the configuration of a viscometer according to another embodiment of the present invention. 5 is a view showing the configuration of a viscometer according to another embodiment of the present invention.

4 and 5 illustrate a viscometer capable of connecting a definitive main pipette 100 having another capillary tube and another chamber through which a measurement fluid can move to the main pipette 100.

That is, the embodiment shown in FIGS. 4 and 5 is for connecting the expansion pipette 300 to the main pipette 100 shown in FIG. 1, and basically the configuration of the main pipette 100 shown in FIG. Include.

To this end, the main pipette 100 is formed with a connector 150 in communication with the first chamber 112 and the second chamber 122.

The expansion pipette 300 is connected to the connector 150. The expansion pipette 300 is formed with an expansion chamber 312 through which the measurement fluid to measure the viscosity from the fluid source through the expansion capillary 310 moves. The first chamber 112, the second chamber 122, and the expansion chamber 312 communicate with each other through the connector 150. The pressure supply device 200 may apply pressure to the first chamber 112, the second chamber 122, and the expansion chamber 312 through the pressure supply port 130. The expansion capillary tube 310 is formed in the same shape as the first capillary tube 110 and the second capillary tube 120, and the expansion chamber 312 is formed in the same shape as the first chamber 112 and the second chamber 122. do.

The structure for connecting the expansion pipette 300 to the connector 150 will be described in detail.

Referring to FIG. 4, the expansion pipette 300 is formed with an expansion hole 350 communicating with the expansion chamber 312, and an expansion protrusion 352 is formed around the expansion hole 350. In addition, the expansion protrusion 352 is press-fitted into the connector 150 to be coupled, so that the expansion pipette 300 is connected to the main pipette 100, and thus the first chamber 112 and the second chamber 122 and Expansion chambers 312 may be coupled to communicate with each other.

In addition, the expansion pipette 300 may be formed with an expansion connector 354 for connecting to another expansion pipette 300.

Referring to FIG. 5, a connection protrusion 152 ′ may protrude around the connector 150 ′, and a thread may be formed on an outer circumferential surface of the connection protrusion 152 ′.

The expansion pipette 300 may have an expansion hole 350 ′ communicating with the expansion chamber 312, and an expansion protrusion 352 ′ protruding from the expansion hole 350 ′. In addition, the expansion protrusion 352 ′ may be provided with an expansion nut 354 ′ that is screwed to the thread of the connection protrusion 152 ′.

By coupling the expansion pipette 300 to the main pipette 100 through the expansion nut 354 'provided in the expansion protrusion 352', the first chamber 112 and the second chamber 122 and expansion Chambers 312 may be coupled to communicate with each other.

In addition, the expansion pipette 300 may be formed with an expansion connector 354 ′ for connecting with another expansion pipette 300.

In this manner, by coupling the expansion pipette 300 to the main pipette 100 and sequentially coupling another expansion pipette 300 to the expansion pipette 300, the viscosity of the plurality of measurement fluids may be simultaneously measured.

6 is a view showing the configuration of a viscometer according to another embodiment of the present invention.

As shown in FIG. 6, the viscometer according to another embodiment of the present invention has a first capillary tube 110 and a first chamber 112 through which a reference fluid flows, and a second fluid through which a measurement fluid flows. A main pipette 100 having a capillary tube 120 and a second chamber 122 formed therein, a pressure supply device 200 supplying pressure to the first chamber 112 and the second chamber 122, and the first chamber The sensing unit 400 that measures the movement amount of the fluid flowing through the chamber 112 and the second chamber 122, and the movement amount of the fluid flowing through the first chamber 112 and the second chamber 122. And a controller 500 that calculates the viscosity of the measurement fluid based on that.

The configuration of the main pipette 100 and the pressure supply device 200 is the same as the main pipette 100 shown in FIG. 1. However, the viscometer according to another embodiment of the present invention has a difference in that it further includes a sensing unit 400 and a controller 500 for detecting the movement amount of the reference fluid and the measurement fluid.

The sensing unit 400 may be a sensor capable of measuring the amount of movement of the fluid. For example, the detector 400 may be a proximity sensor or an optical sensor. However, the scope of the present invention is not limited thereto.

The controller 500 may apply a positive pressure to the first chamber 112 after applying a negative pressure to the first chamber 112 through the pre-stored viscosity of the reference fluid and the pressure supply device 200. When the amount of movement of the reference fluid (nref) measured by the sensing unit 400, and the negative pressure is applied to the second chamber 122 through the pressure supply device 200, the positive pressure to the second chamber 122 When is applied, the viscosity of the measurement fluid may be calculated from the ntest of the measurement fluid measured by the sensing unit 400.

 Specifically, the controller 500 may calculate the viscosity of the measurement fluid through Equation 1.

Hereinafter, a method of calculating the viscosity of a measurement fluid through a viscometer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

7 and 8 are views for explaining a method of measuring the viscosity of the fluid through a viscometer according to an embodiment of the present invention. Hereinafter, a viscometer according to an embodiment of the present invention shown in FIG. 1 will be described as an example. Viscosity measurement method of the measurement fluid through a viscometer according to another embodiment of the present invention is also the same as the method described below.

Referring to FIGS. 7 and 8, the main pipette 100 is immersed in the reference fluid source in which the reference fluid is stored and the measurement fluid source in which the measurement fluid is stored, and the pressure of the main pipette 100 is used by the pressure supply device 200. When a negative pressure is applied to the first chamber 112 and the second chamber 122, the reference fluid moves upward along the first capillary 110 and the first chamber 112 from the reference fluid source, and the measurement fluid is measured It moves upward from the fluid source along the second capillary tube 120 and the second chamber 122.

At this time, the reference fluid moves to the position of nr1, and the measurement fluid moves to the position of nt1. Here, nr1 and nt1 can be measured from the scale formed in the main pipette 100.

When the positive pressure is applied to the first chamber 112 and the second chamber of the main pipette 100 by using the pressure supply device 200, the reference fluid is the first capillary tube 110 and the first chamber 112. Is discharged to the reference fluid source while moving downward along the and the measurement fluid is discharged to the measurement fluid source while moving downward along the second capillary tube 120 and the second chamber 122.

At this time, the reference fluid moves from the position of nr2 to the position of nr2, and the measurement fluid moves from the position of nt2 to the position of nt2. Here, nr2 and nt2 can be measured from the scale formed in the main pipette 100.

Therefore, when a negative pressure is applied to the first chamber 112 after a negative pressure is applied to the first chamber 112, the moving amount nref of the reference fluid becomes nr2, and a negative pressure is applied to the second chamber 122. Then, when a static pressure is applied to the second chamber 122, the amount ntest of the measurement fluid becomes nt2.

When the reference fluid and the measurement fluid flow through the capillaries of the main pipette 100, the volumetric flow rates Q of the reference fluid and the measurement fluid can be determined as follows.

[Equation 2]

In Equation 2, r is a capillary radius, ΔP is the pressure drop through each capillary of the smart main pipette 100, μ is the viscosity, L is the length of the capillary.

In Equation 2 above, ΔP may be defined as follows.

[Equation 3]

In Equation 3, Patm is the atmospheric pressure, Pp is the internal air pressure generated inside the chamber when a positive pressure is applied through the pressure supply device 200, Pc is a capillary pressure defined as follows.

[Equation 4]

In Equation 4, σ is the interfacial tension of the liquid and θ is the contact angle of the liquid on the capillary surface.

Since the cross section of each chamber of the main pipette 100 is formed sufficiently large compared with the cross section of each capillary tube, Pc can be ignored. Since the first chamber 112 and the second chamber 122 are formed in the same shape, and the first capillary tube 110 and the second capillary tube 120 are formed in the same shape, ΔP in each capillary is the same. .

Also, in the case of large capillaries with large cross sections of capillaries, the pressure drop through the respective chambers has a significant effect on ΔP through the capillaries in series with the respective chambers (see FIG. 9).

Therefore, the hydraulic resistance between each chamber and each capillary tube is preferably determined as follows.

[Equation 5]

Rca> 410 Rfl

In Equation 5, Rca is the hydraulic resistance of the capillary tube, Rfl is the hydraulic resistance of the chamber, the hydraulic resistance (R) is defined as in the following equation (6).

[Equation 6]

In Equation 6, r is the capillary radius, μ is the viscosity, L is the length of the capillary.

Equation 2 above may be individually applied to each capillary (the first capillary 110 and the second capillary 120). In addition, since the pressure drop and geometry are the same for both capillaries, the viscosity of the measuring fluid can be expressed by the following equation.

[Equation 7]

In Equation 7, μtest is the viscosity of the measurement fluid, μref is the viscosity of the reference fluid, nref is the movement of the reference fluid, ntest is the movement of the measurement fluid, A is the cross-sectional area of each chamber, and t is the time required for dispensing the liquid. .

Meanwhile, a pressure supply device such as a syringe which does not supply a constant pressure to the first chamber 112 and the second chamber 122 of the main pipette 100 to measure the viscosity of non-Newtonian fluids ( The case of using 200) will be described.

That is, since the viscosity of the fluid varies with the shear rate of the non-Newtonian fluid, the viscosity of the measurement fluid cannot be accurately measured unless the shear rate is constant.

The shear rate of the fluid is a function of the volume flow rate (Q) and the diameter (r) of the capillary, and can be expressed by the following equation.

[Equation 8]

As can be seen in Equation 8 above, the shear rate is determined by the volume flow rate (Q) and the diameter (r) of the capillary tube.

As can be seen from Equation 2, the volume flow rate Q is determined by the pressure drop ΔP of the capillary tube and the viscosity of the fluid. As can be seen in Equation 3, the pressure drop ΔP of the capillary tube is dependent on the air pressure generated inside the chamber through the pressure supply device 200.

Therefore, if the pressure supplied from the pressure supply device 200 is not constant, the viscosity of the measurement fluid cannot be measured accurately.

In order to solve this problem, by providing an air chamber between the pressure supply device 200 and the main pipette 100, it is possible to supply a constant pressure from the pressure supply device 200 to the chambers of the main pipette 100 This makes it possible to accurately measure the viscosity of the measurement fluid.

As described above, according to the viscometer according to the embodiment of the present invention, it is possible to accurately calculate the viscosity of unknown measurement fluid without a complicated equipment or theoretical estimation through simple calculation.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

100: main pipette
110: first capillary
112: first chamber
120: second capillary
122: second chamber
130: pressure supply port
150: connector
200: pressure supply
210: air chamber
300: extension pipette
310: expanded capillary
312: expansion chamber
350, 350 ': Expansion spout
352, 352 ': expanding protrusion
354, 345 ': expansion connector
354 ': extension nut
400: detector
500: controller

Claims (17)

The first fluid through which the reference fluid, whose viscosity is known, moves from the first fluid source through the first capillary tube, and the measurement fluid to measure viscosity through the second capillary tube having the same shape as the first capillary tube from the second fluid source, A main pipette having at least one second chamber having the same shape as the moving first chamber;
An expansion pipette coupled with a connector formed in the main pipette and having an expansion chamber through which another measurement fluid to measure viscosity from another fluid source moves through the expansion capillary; And
A pressure supply device for supplying pressure to the first chamber, the second chamber, and the expansion chamber;
Viscometer comprising a. The method of claim 1,
A pressure supply port is formed at an upper portion of the main pipette to communicate with the first chamber and the second chamber.
The pressure supply device supplies a pressure to the first chamber and the second chamber through the pressure supply port. The method of claim 1,
A viscometer is formed on the inner side or the outer side of the main pipette corresponding to the first chamber and the second chamber at intervals. The method of claim 3,
Viscosity (μref) of the reference fluid, the amount of movement of the reference fluid (nref) when the positive pressure is applied to the first chamber after applying a negative pressure to the first chamber through the pressure supply device, and through the pressure supply device A controller for calculating a viscosity of the measurement fluid from a test amount ntest of the measurement fluid when a negative pressure is applied to the second chamber and then a positive pressure is applied to the second chamber;
Viscometer further comprising. The method of claim 4, wherein
The controller

To calculate the viscosity of the measuring fluid through the equation of,
Where μtest is the viscosity of the measurement fluid, μref is the viscosity of the reference fluid, nref is the amount of movement of the reference fluid, and ntest is the amount of movement of the measurement fluid. The method of claim 2,
The first chamber is connected in series with the first capillary,
And the second chamber is connected in series with the second capillary. delete The method of claim 1,
The expansion chamber is formed in the same shape as the first chamber and the second chamber,
The expansion capillary is formed in the same shape as the first capillary and the second capillary,
And the expansion chamber is in communication with the first chamber and the second chamber through the connector. The method of claim 8,
The expansion pipette is formed with an expansion connector for connecting with another expansion pipette. The method of claim 8,
The expansion pipette is formed with an expansion port in communication with the expansion chamber,
The expansion protrusion protrudes around the expansion port,
The expansion protrusion is a viscometer coupled to the connector by pressing. The method of claim 8,
A connecting protrusion is formed protrudingly around the connector, and a thread is formed on an outer circumferential surface of the connecting protrusion.
The expansion pipette is formed with an expansion opening in communication with the expansion chamber, the expansion protrusion protrudes around the expansion opening,
The expansion protrusion is provided with an expansion nut for screwing the connection protrusion and the screw. The method of claim 1,
An air chamber provided between the main pipette and the pressure supply device;
Viscometer further comprising. A first chamber through which the reference fluid, whose viscosity is known, is moved from the first fluid source through the first capillary tube, and at least one second chamber, through which the measurement fluid intended to measure viscosity is moved, from the second fluid source through the second capillary tube; A main pipette formed;
An expansion pipette coupled with a connector formed in the main pipette and having an expansion chamber through which another measurement fluid to measure viscosity from another fluid source moves through the expansion capillary;
A pressure supply device for supplying pressure to the first chamber, the second chamber, and the expansion chamber;
A detector configured to measure a movement amount of the fluid flowing through the first chamber, the second chamber, and the expansion chamber; And
A controller for calculating a viscosity of the measurement fluid based on the amount of movement of the fluid flowing through the first chamber, the second chamber, and the expansion chamber sensed by the sensing unit;
Viscometer comprising a. The method of claim 13,
A pressure supply port is formed at an upper portion of the main pipette to communicate with the first chamber and the second chamber.
The pressure supply device supplies a pressure to the first chamber and the second chamber through the pressure supply port. The method of claim 13,
The controller
Viscosity (μref) of the reference fluid, the amount of movement of the reference fluid (nref) when the positive pressure is applied to the first chamber after applying a negative pressure to the first chamber through the pressure supply device, and through the pressure supply device And a viscosity of the measurement fluid is calculated from the ntest of the measurement fluid when a positive pressure is applied to the second chamber after applying a negative pressure to the second chamber. The method of claim 15,
The controller

Calculate the viscosity of the measured fluid through the equation
Where μtest is the viscosity of the measurement fluid, μref is the viscosity of the reference fluid, nref is the amount of movement of the reference fluid, and ntest is the amount of movement of the measurement fluid. The method of claim 13,
An air chamber provided between the main pipette and the pressure supply device;
Viscometer further comprising.

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