阅读说明：本技术 一种磁悬流体在线检测仪 (Magnetic suspension fluid on-line detector ) 是由 王健 于 2020-05-08 设计创作，主要内容包括：本发明涉及一种磁悬流体在线检测仪,包括磁悬转子电机、传感圆筒、角速度测量模块、距离测量模块以及控制模块；所述传感圆筒连接至所述磁悬转子电机的转子,部分或全部浸入待测流体内,在所述磁悬转子电机的驱动下转动；所述控制模块基于所述传感圆筒的旋转角速度、浸入待测液体中的高度以及所述磁悬转子电机的转动力矩计算液体动力粘度并输出。本发明在力传动方面,摒弃了以往传统的轴加轴承的传动方法,采用磁悬系统替代轴承,从根本上解决了因摩擦力引起环境温度变化的影响,造成的测量误差,提高了测量精度。本发明的只有传感圆筒和连杆裸露在电机壳体外部,因此可以直接放置在罐体内、化工反应釜或管道上进行测量,适用范围广,通用性好。(The invention relates to an online detector for magnetic suspension fluid, which comprises a magnetic suspension rotor motor, a sensing cylinder, an angular speed measuring module, a distance measuring module and a control module, wherein the sensing cylinder is arranged on the magnetic suspension rotor motor; the sensing cylinder is connected to a rotor of the magnetic suspension rotor motor, is partially or completely immersed in a fluid to be detected and is driven to rotate by the magnetic suspension rotor motor; and the control module calculates and outputs the hydrodynamic viscosity based on the rotation angular speed of the sensing cylinder, the height of the sensing cylinder immersed in the liquid to be measured and the rotation torque of the magnetic suspension rotor motor. In the aspect of force transmission, the traditional transmission method of adding a bearing to a shaft is abandoned, and the magnetic suspension system is adopted to replace the bearing, so that the measurement error caused by the influence of environmental temperature change caused by friction force is fundamentally solved, and the measurement precision is improved. Only the sensing cylinder and the connecting rod are exposed outside the motor shell, so that the sensor can be directly placed in a tank body, a chemical reaction kettle or a pipeline for measurement, and the sensor has wide application range and good universality.)

1. The online detector for the magnetic suspension fluid is characterized by comprising a magnetic suspension rotor motor, a sensing cylinder, an angular speed measuring module, a distance measuring module and a control module;

the rotor of the magnetic suspension rotor motor rotates in a suspension manner under the action of magnetic force;

the sensing cylinder is connected to a rotor of the magnetic suspension rotor motor, is partially or completely immersed in a fluid to be detected and is driven to rotate by the magnetic suspension rotor motor;

the angular velocity measuring module detects the rotation angular velocity of the sensing cylinder and sends the rotation angular velocity to the control module;

the distance measuring module measures the height of the sensing cylinder immersed in the fluid to be measured;

and the control module calculates and outputs viscosity based on the rotation angular speed of the sensing cylinder, the height of the sensing cylinder immersed in the fluid to be measured and the output torque of the magnetic suspension rotor motor.

2. The online magnetic suspension fluid detector of claim 1, wherein the control module calculating the viscosity η comprises:

where h is the height of the sensing cylinder immersed in the fluid to be measured, ω is the angular velocity of rotation of the sensing cylinder, R_fFor sensing the cylinder radius, R_aThe radius of the fluid container to be measured is M, and the output torque of the magnetic suspension rotor motor is M.

3. The online magnetic suspension fluid detector of claim 1, wherein the cylinder radius is smaller than 1/10 of the radius of the liquid container to be detected, and the control module calculates the viscosity η by:

where h is the height of the sensing cylinder immersed in the fluid to be measured, ω is the angular velocity of rotation of the sensing cylinder, R_fThe radius of the cylinder is, and M is the output torque of the magnetic suspension rotor motor.

4. The online magnetic suspension fluid detector according to any one of claims 1 to 3, wherein the angular velocity measuring module measures the rotational angular velocity of the rotor using an absolute value encoder to obtain the rotational angular velocity of the sensing cylinder.

5. The online magnetic suspension fluid detector according to claim 4, wherein the distance measuring module is disposed in the magnetic suspension rotor motor housing by using a laser range finder, and emits laser through a transparent window at the lower part of the magnetic suspension rotor motor housing to reflect through the fluid surface, so as to measure the distance from the fluid surface, and further calculate the height of the sensing cylinder immersed in the fluid to be detected.

6. The online magnetic suspension fluid detector according to one of claims 1 to 3, wherein the online magnetic suspension fluid detector is provided with a plurality of sensing cylinders with different specifications, and the specification of the sensing cylinder is selected according to the viscosity of the liquid to be measured and the type of the viscosity medium, so that the online magnetic suspension fluid detector can accurately measure the viscosity value of the medium in different operating environments.

Technical Field

The invention relates to the technical field of fluid detection, in particular to an online detector for magnetic suspension fluid.

Background

The online detector for magnetic suspension fluid is a sensor for detecting the characteristics of fluid medium, and aims to provide a multifunctional detector capable of simultaneously detecting the flow rate, viscosity and density of fluid according to different requirements.

The like products in the existing market adopt a motor to drive a transmission shaft to rotate or drive a cylindrical body with a certain cross section area through the rotation (vibration) of the transmission shaft by using the vibration principle, the equivalent values of the flow rate, viscosity and density of a fluid medium are detected, and the stress of the transmission shaft is also changed due to the principle of expansion caused by heat and contraction caused by the ambient temperature, so that the detected signals are multifaceted and are not real measured values; therefore, adverse factors are brought to monitoring in the production process of the product, and a large amount of operation and maintenance cost is increased for enterprises. The common problem of the similar products in the existing market is that the measurement error caused by the change of the friction force along with the temperature is not controllable, so that the product quality is unstable.

In addition, the on-line fluid detectors used in the current market all adopt a small-sized low-speed gear motor to drive two superposed disks, and a viscosity metering device is formed by a spring or an oil wire. When the motor rotates, the two disks generate a rotation angle difference under the action of the motor rotating force and the calibration viscosity liquid, the angle difference is a viscosity value, and the measurement viscosity value is calibrated according to the value of the calibration viscosity liquid and the angle difference of the disks. The drawback is that the structural features limited to it cannot be installed on industrial chemical sites, for example: in the pipeline or in the reaction kettle and in the tank body.

Disclosure of Invention

Aiming at the measurement error caused by friction force, the invention provides the magnetic suspension fluid online detector, which adopts a magnetic suspension system, wherein a transmission shaft is suspended in the middle of a bearing, so that the friction force is avoided, the problem that the space between the shaft and the bearing is influenced by the environment is fundamentally solved, and the quality of a product is greatly improved.

In order to achieve the aim, the invention provides an online detector for magnetic suspension fluid, which comprises a magnetic suspension rotor motor, a sensing cylinder, an angular velocity measuring module, a distance measuring module and a control module, wherein the sensing cylinder is arranged on the magnetic suspension rotor motor;

the rotor of the magnetic suspension rotor motor rotates in a suspension manner under the action of magnetic force;

the sensing cylinder is connected to a rotor of the magnetic suspension rotor motor, is partially or completely immersed in a fluid to be detected and is driven to rotate by the magnetic suspension rotor motor;

the angular velocity measuring module detects the rotation angular velocity of the sensing cylinder and sends the rotation angular velocity to the control module;

the distance measuring module measures the height of the sensing cylinder immersed in the fluid to be measured;

and the control module calculates and outputs viscosity based on the rotation angular speed of the sensing cylinder, the height of the sensing cylinder immersed in the fluid to be measured and the output torque of the magnetic suspension rotor motor.

Further, the control module calculating the viscosity η includes:

where h is the height of the sensing cylinder immersed in the fluid to be measured, ω is the angular velocity of rotation of the sensing cylinder, R_fFor sensing the cylinder radius, R_aThe radius of the fluid container to be measured is M, and the output torque of the magnetic suspension rotor motor is M.

Further, the cylinder radius is less than 1/10 of the radius of the liquid container to be measured, and the control module calculating the viscosity η comprises:

where h is the height of the sensing cylinder immersed in the fluid to be measured, ω is the angular velocity of rotation of the sensing cylinder, R_fThe radius of the cylinder is, and M is the output torque of the magnetic suspension rotor motor.

Further, the angular velocity measuring module adopts an absolute value encoder, measures the rotation angular velocity of the rotor to obtain the rotation angular velocity of the sensing cylinder.

Furthermore, the distance measuring module is arranged in the magnetic suspension rotor motor shell by adopting a laser range finder, and emits laser to be reflected by the fluid liquid level through a transparent window at the lower part of the magnetic suspension rotor motor shell to measure the distance from the fluid liquid level, so as to calculate the height of the sensing cylinder immersed in the fluid to be measured.

Furthermore, the online magnetic suspension fluid detector is provided with a plurality of sensing cylinders with different specifications, and the specification of the sensing cylinders is selected according to the viscosity of the measured liquid and the type of the viscosity medium, so that the online magnetic suspension fluid detector can accurately measure the viscosity value of the medium under different working environments.

The technical scheme of the invention has the following beneficial technical effects:

(1) in the aspect of force transmission, the traditional transmission method of adding a bearing to a shaft is abandoned, and the magnetic suspension system is adopted to replace the bearing, so that the measurement error caused by the influence of environmental temperature change caused by friction force is fundamentally solved, and the measurement precision is improved.

(2) The magnetic suspension rotor servo motor adopts a high-precision absolute value encoder, calculates the vector angle difference to convert the viscosity value, the vector angle difference is the inherent performance of the motor, the vector angle difference is in direct proportion to the viscosity, and the physical quantity of a measured fluid medium is accurately calculated through a control module, so that accurate measurement data are obtained.

(3) Only the sensing cylinder and the connecting rod are exposed outside the motor shell, so that the sensor can be directly placed in a tank body, a chemical reaction kettle or a pipeline for measurement, and the sensor has wide application range and good universality.

(4) The invention can simultaneously detect the viscosity of fluid according to different requirements, and further obtain the flow rate and the density through software analysis. Compared with products in the existing market, the multifunctional online measuring instrument is one-machine-one-use, and the products of our company have the function of one-machine-multiple-use and can realize the function of on-site online direct measurement.

Drawings

FIG. 1 is a schematic diagram of an online detector for magnetic suspension fluid.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The invention provides an online detector for magnetic suspension fluid, which comprises a magnetic suspension rotor motor 1, a sensing cylinder 2, an angular speed measuring module, a distance measuring module and a control module, wherein the angular speed measuring module is connected with the sensing cylinder;

the rotor of the magnetic suspension rotor motor 1 rotates in a suspension manner under the action of magnetic force;

the sensing cylinder is connected with a rotor which is fixed to the magnetic suspension rotor motor 1 through a connecting rod 4, is partially or completely immersed in a fluid 3 to be measured and is driven by the magnetic suspension rotor motor 1 to rotate;

the angular velocity measuring module detects the rotation angular velocity of the sensing cylinder 2 and sends the rotation angular velocity to the control module;

the distance measuring module measures the height of the sensing cylinder 2 immersed in the fluid to be measured;

and the control module calculates and outputs the hydrodynamic viscosity based on the rotation angular speed of the sensing cylinder, the height of the sensing cylinder immersed in the fluid to be measured and the output torque of the magnetic suspension rotor motor.

The magnetic suspension rotor motor 1 can be fixed by directly installing the magnetic suspension fluid online detector in a tank body or on a chemical reaction kettle and a pipeline, and the sensing cylinder is partially or completely immersed in the fluid to be detected 3 to be contacted with the fluid and senses the viscosity shearing force to calculate the viscosity value. The calculation formula is as follows:

in the formula:

eta-hydrodynamic viscosity, Pa · S;

h is the height of the sensing cylinder for measuring immersed in the fluid to be measured;

R_f-sensing the cylinder radius;

R_a-the radius of the fluid container to be measured;

m is viscosity torque, which is equal to the output torque of the motor;

ω -angular velocity of rotation of the sensing cylinder.

When R in FIG. 1_aFar greater than R_fThen, the formula becomes:

the invention adopts an absolute value encoder to measure the rotation angular velocity of the motor rotor, and realizes indirect measurement of the rotation angular velocity of the sensing cylinder by utilizing the fact that the rotation angular velocity of the motor rotor is equal to the rotation angular velocity of the sensing cylinder. The angular velocity of the rotor is calculated from the angular difference between the control stator pull angle and the rotor magnetic chain loop. The viscosity value is measured by using the stator variable-frequency traction angle to replace the traditional principle of disc slip. The disc rotation principle is transferred to the interior of the motor by a software technical method, no balance spring or spring leaks, only the motor shaft leaks, and the viscosity sensing small ball is driven to be in contact with the viscosity liquid to be measured.

The distance measuring module is arranged in the magnetic suspension rotor motor shell by adopting a laser range finder, and emits laser to be reflected by the fluid liquid level through a transparent window at the lower part of the magnetic suspension rotor motor shell to measure the distance from the fluid liquid level, so as to calculate the height of the sensing cylinder immersed in the liquid to be measured.

The absolute value encoder and the laser range finder are arranged in the motor shell, only the sensing cylinder and the connecting rod are exposed outside the shell, and the online fluid detector can be directly arranged in a tank body or on a chemical reaction kettle and a pipeline.

The magnetic suspension rotor motor induces a magnetic field in a rotating rotor by utilizing radial and axial magnets installed on a machine base, and suspends the rotating rotor through the interaction of the magnetic fields of a stator and a rotor, so that the mechanical problem caused by contact friction of a rotating shaft and a bearing of the traditional motor is avoided, and the rotating speed of the motor is not limited by the bearing. Two magnetic fields with the same magnetic pole can be adopted to act on the shaft, so that the shaft is suspended between the two magnetic fields.

After the working principle of the magnetic suspension shaft is adopted, the transmission shaft is suspended in the middle of the bearing, and no friction force is generated, so that the sensor is not influenced by characteristics such as temperature and the like, the measurement precision is improved by a great level, the quality of a product is greatly improved, and great economic benefits are brought to enterprises.

Further, in the actual viscosity measurement process, the specification of the measuring cylinder can be selected according to the viscosity of the measured liquid and the type of the viscosity medium by setting the proportion of the cylinders with different specifications, and the viscosity value of the medium can be more accurately measured under different use working environments by selecting the sensing cylinders with different specifications.

And the real measurement value of the viscosity is comprehensively analyzed according to the stress and the combination of the displacement variation and the current variation, so that the measurement precision, the stability and the accuracy of the viscosity value are integrally improved.

In summary, the present invention relates to an online detector for magnetic suspension fluid, which comprises a magnetic suspension rotor motor, a sensing cylinder, an angular velocity measurement module, a distance measurement module and a control module; the sensing cylinder is connected to a rotor of the magnetic suspension rotor motor, is partially or completely immersed in a fluid to be detected and is driven to rotate by the magnetic suspension rotor motor; and the control module calculates and outputs hydrodynamic viscosity based on the rotation angular speed of the sensing cylinder, the height of the sensing cylinder immersed in the liquid to be measured and the output torque of the magnetic suspension rotor motor. In the aspect of force transmission, the traditional transmission method of adding a bearing to a shaft is abandoned, and the magnetic suspension system is adopted to replace the bearing, so that the measurement error caused by the influence of environmental temperature change caused by friction force is fundamentally solved, and the measurement precision is improved. Only the sensing cylinder and the connecting rod are exposed outside the motor shell, so that the sensor can be directly placed in a tank body, a chemical reaction kettle or a pipeline for measurement, and the sensor has wide application range and good universality.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.