JPH11237326A - Viscosity-measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily measure the viscosity of a sample liquid. SOLUTION: A columnar rotator 6 is dipped into a liquid sample that is accommodated in a cylindrical sample container 12, the rotator 6 is rotated at a constant speed by a motor 3, and a detector 13 of the amount of rotary deviation and a force coil 14 are connected to a movable member 9 that is connected to the sample container 12 and is located at the upper portion. Then, a torque that is balanced with the amount of rotary deviation being detected by the detector 13 is generated in the force coil 14 by a force balance circuit, and the viscosity of the sample liquid is obtained by current that flows to the force coil 14 at this time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the viscosity of a liquid, and more particularly, to an apparatus for measuring the viscosity of a sample liquid by a torque transmitted from a rotating body to another member via the sample liquid. It is about.

[0002]

2. Description of the Related Art As a method of measuring the viscosity of a liquid, there are a method of measuring a falling speed of an object in a liquid, a method of measuring a flow velocity or a flow rate of a liquid flowing through a special passage, and a method of measuring an object falling on a liquid surface. There are various methods such as a method of measuring the degree of penetration.

[0003]

Conventionally, however, the viscosity can be measured by a simple operation such as loading a container containing the sample liquid into the measuring machine or simply immersing the measuring probe in the sample liquid. The device was not present. Therefore, the present invention aims to realize an apparatus that can easily measure the viscosity.

[0004]

According to the present invention, there is provided a viscosity measuring apparatus comprising: a rotating body rotated at a constant speed by a motor; a cylinder surrounding the rotating body with a sample liquid interposed therebetween; Detecting means such as a differential transformer for detecting the amount of rotational displacement around the body, and a force balance circuit operable to return the cylinder to a position before the displacement, and the force balance circuit A force coil for generating a magnetic force acting to return the cylinder to the position before the shift is included.

[0005] It is desirable that the motor, the rotation deviation detecting means, and the force coil are provided in a detecting portion container located above the rotating body and the cylindrical body. In this case, the rotating shaft of the motor penetrates the bottom of the detection unit container, is coupled to the rotating body, and extends downward from a movable member rotatably supported in the detection unit container. The lower end is connected to the above-mentioned cylindrical body through a window formed in the hole. The cylinder is
It can be a sample container for storing a sample liquid.

When the sample liquid is accommodated in the sample container and coupled to the legs of the movable member, the rotating body is immersed in the sample liquid. Here, when the rotating body is rotated by the motor, a torque appears in the sample container due to the rotation of the sample liquid. Therefore, if the force balance circuit is operated based on the amount of deviation detected by the rotational deviation amount detecting means, and the force coil generates a torque in a direction to cancel the deviation amount, the excitation of the force coil is performed. The magnitude of the torque can be known from the current.

[0007]

1 and 2, a rotating shaft 4 of a motor 3 supported on a bottom 2 of a detection unit container 1 extends downward through a hole 5 provided at the center of the bottom 2. As shown in FIG. In addition, a cylindrical rotating body 6 is supported at the lower end. A U-shaped movable member 9 suspended by a ridge 8 at the center of a ceiling wall 7 of the container 1
The two legs 10 and 10 extend downward through windows 11 and 11 formed in the bottom 2, and a cylindrical sample container 12 coaxially surrounding the rotating body 6 is detachably attached to the lower end thereof. ing. The upper ends of both legs 10 and 10 of the movable member 9 are
They are respectively connected to a differential transformer 13 and a force coil 14 fixed to the side wall of the container 1.

In FIG. 3, the differential transformer 13 has a fixed iron core 16 having a magnetic gap 15 and a movable iron core 17 located in the magnetic gap 15.
Excitation coils 20, 21 and detection coils 22, 23 are wound around 8, 19, respectively. Excitation coils 20 and 2
1 is connected in series in the forward direction and connected to the AC power supply 24, and the detection coils 22 and 23 are connected in series in the reverse direction to reach the input side of the amplifier 25. In addition, fixed iron core 1
6 is attached to the peripheral wall of the detection unit container 1, and the movable iron core 17 is connected to the movable member 9.

The output of the amplifier 25 is rectified by the rectifier 26, and supplied to the coils 29, 29 of the force coil 14 via the recorder 27 and the ammeter 28.
The magnetic force generated at 29 acts on the movable permanent magnet 30 of the force coil 14. The movable permanent magnet 30 is connected to the movable member 9, and the coils 29, 29 are attached to the peripheral wall of the detection unit container 1.

Referring again to FIG. 1, a mounting table 31 is disposed below the sample container 12, and the rotation of the knob 33 of the resting mechanism 32 causes the mounting table 31 to move up and down. A zero-point adjusting knob 34 is provided at the center of the upper surface of the ceiling wall 7 of the detection unit container 1, and the spring 8 is connected to the zero-point adjusting knob 34. 35, 35 are stoppers provided between the movable member 9 and the lower surface of the ceiling wall 7.

In the above-described apparatus, a liquid sample 36 is accommodated in the sample container 12, and the two
When the motor 3 is rotated, a torque is generated in the sample container 12 by the rotation of the rotating body 6, and a current balanced with the torque flows through the force coil 14. The magnitude of this torque changes according to the viscosity of the sample liquid, and the current flowing through the force coil 14 corresponds to this torque.
By the instruction at 8, the viscosity of the sample liquid can be determined.

In the above-described embodiment, the viscosity is measured while the sample liquid is contained in the cylindrical container 12. However, instead of the cylindrical container, a cylindrical body having an open bottom is used. Can be configured to be immersed in the sample liquid to measure the viscosity.

[0013]

As is clear from the above embodiments,
According to the present invention, the viscosity can be measured by a simple operation of merely loading a sample liquid in a container and loading the device, or immersing a part of the device in the sample liquid. You can also know the situation of the viscosity change every moment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an electric circuit diagram of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector container 3 Motor 4 Rotating shaft 5 Rotating body 8 Spring 9 Moving member 11 Window 12 Cylindrical body (sample container) 13 Rotational deviation detector 14 Force coil 25 Amplifier 26 Rectifier 27 Recorder 28 Ammeter 30 Force coil permanent magnet

Claims (6)

[Claims] A rotating body which is rotated at a constant speed by a motor, a cylinder surrounding the rotating body with a sample liquid interposed therebetween, a detecting means for detecting a rotational deviation amount of the cylindrical body around the rotating body, and A viscosity balance device including a force balance circuit that generates a torque in a direction to return the cylinder to a position before the displacement in response to the displacement amount signal obtained by the detection means. 2. The viscosity measuring apparatus according to claim 1, wherein said cylindrical body is a container for storing a sample liquid. 3. The viscosity measuring device according to claim 1, wherein the rotating body has a cylindrical shape with its rotation axis as a central axis. 4. The viscosity measuring device according to claim 1, wherein the cylindrical body has a cylindrical shape with a rotation axis of the rotating body as a central axis. 5. The viscosity measuring device according to claim 1, wherein said rotation deviation detecting means is a differential transformer. 6. A measuring unit container is provided above the rotating body and the cylindrical body, and the motor is disposed in the detecting unit container, and a rotation axis thereof penetrates a bottom of the detecting unit container and rotates the rotating unit. The legs of the movable member rotatably supported across the motor in the detection portion container extend through a window formed at the bottom of the detection portion container, and the lower end thereof has the cylinder. 2. The viscosity measuring device according to claim 1, wherein the body is supported, and the rotation shift amount detecting means and the force coil are interposed between the detection unit container wall and the movable member.