Cyclone turbine flowmeter and control system therefor

Details Cyclone turbine flowmeter and control system therefor Cyclone turbine flowmeter and control system therefor

1998-07-20

2001-07-10

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Using turbine

C073S861790, C073S861770, C073S861920

Reexamination Certificate

active

06257073

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cyclone turbine flowmeter for enabling to obtain a signal of flow rate by using energy of fluids, and more particularly to a cyclone turbine flowmeter and a control system therefor for extracting information about a flow rate or measuring the quantity of flow flowing in production facilities and by which signals output as a result of flow measurement are detected and monitored, thereby enabling an user to effectively perform manufacturing process controls.
2. Description of the Prior Art
Generally, a flowmeter has been used and held a key element in measuring continuously a flow rate of liquid in order to apply the results to a manufacturing process control while fluids of high purity (water, gas, oil, chemicals and medicines in a high pure state) are continuously supplied during manufacturing processes, in the various fields of industry, that is, in the fields of industry relating to semiconductor, electrical and electronics parts, aviation and space engineering, refining for oil, chemical engineering and the like.
There are many kinds of flowmeters which are used in the industrial world, and are mainly classified by functions and measuring principles of industrial flowmeters, and by whether or not energy generated by flowing fluids themselves is used.
At this location, for example, the flowmeters produced on a commercial scale may be classified into volume, area, pressure, turbine and turbulent streamline control flowmeters according to whether or not energy generated by fluid itself is used to get a signal of the quantity of flow, and the flowmeters which energy sources are separately needed are classified into ultrasonics, electronics and mass flowmeters.
Flowmeters are classified according to various kinds of measured fluids as follows.
TABLE 1
Measured fluids
Classification of flowmeters
For liquid or gas
volume flowmeter, area flowmeter, differential
pressure flowmeter, turbine flowmeter, vortex
flowmeter, ultrasonic flowmeter, mass flowmeter
(Coriolis type, thermal type, vortex-type), integrating
calorimeter
For liquid only
electronics flowmeter, open channel flowmeter
Among the above-mentioned flowmeters, the turbine-type of flowmeter is widely used. Such turbine type of flowmeter is controlled in such a manner that energy of flowing liquid is transmitted to a fan (blade) mounted to a rotor.
However, such conventional turbine type of flowmeters have the following problems caused by the fact that liquids flowing through the flowmeter stream directly into manufacturing equipments.
First, the conventional flowmeters generally lack in impacts from the outside. That is, the quantity of flow to be measured by the flowmeters is abruptly changed by outside impacts of the flowmeter bodies or by pressure change in liquids flowing within the flowmeters, and such sudden change in the amount of flowing liquids often causes to be broken in the flowmeters.
Second, the conventional flowmeters cause to enormously raise rotor's noises and measurement errors in response to a direction of installation thereof. That is, when the flowmeters are not installed in the direction designed by manufacturers, liquids flowing through the flowmeters are interfered in its flow directions because the flowmeters are simply constructed by a rotor and small sized tubes which supply liquids to the rotor, thereby causing measurement errors and raising frictional forces.
Third, the conventional flowmeters used to result in the deterioration in temperature characteristic of liquids to be measured. That is, the rotor of the flowmeters, bodies fixed to them, bearings, and the like are made of various materials, for example, metals, non-metals, teflon-type of compounds and the others, and have coefficients of thermal expansion different from each other. Thus, there is problems according to the conventional flowmeters, when temperature in environments is changed, in that rotary power of the rotors are remarkably reduced due to the repeated thermal expansion and thermal contraction, furthermore, bodies of rotational rotors themselves become separated from one another, after all.
FIG. 1
shows an operating state view applied to a ball type of a flowmeter as a detailed embodiment in the prior art. As shown in
FIG. 1
, liquids (medical supplies) which have been stored within a tank
20
pass through a flowmeter
21
, and are filtered by a filter
22
while the liquids pass through it. Thereafter, the liquids are stored in a measuring tank
23
, the stored liquids are not supplied to a circulation system of medical supplies until a predetermined amount of liquids has been reached while the liquids are stored.
Such a conventional simple system in which the ball-type of a flowmeter is installed is widely used more than 90%, a record-control type of a flowmeter is rarely used because it has various problems in a degree of precision and re-availability. Furthermore, there is a problem, in case any accident in the process happens, in that the measuring tank is necessarily needed in controlling the ratio of compounds or the amount of pure water supply in order to analyze the reason why the accident happens.
SUMMARY OF THE INVENTION
Accordingly, the present invention is provided to solve the aforementioned problem and it is an object of the present invention to provide a cyclone turbine flowmeter which deterioration of its rotational rotor resulting from pressure change in liquids to be measured is minimized and exterior impacts can be fully overcome.
Another object of the present invention is to provide a control system of a cyclone turbine flowmeter in which degree of measurement sensitivity is still maintained as a good state while energy generated in response to liquid's flowing operation is transmitted to energy such as frictional forces or noises, and at the same time, by which can precisely measure the amount of liquids by improving temperature change characteristic according to a coefficient of thermal expansion to suppress a loss in energy transmitting mechanism of liquids which appears while liquids flow within the flowmeter.
In accordance with the objects of the present invention, there is provided a cyclone turbine flowmeter having a cap and a housing, the flowmeter comprises a cyclone turbine formed with a flow path which enables flowing liquids to receive rotary power when flowing therein, a rotor rotated by the liquids passed through the flow path of the cyclone turbine, a turbine bearing manufactured so as to minimize frictional forces and at the same time, to have durability and resistance to chemicals, and a vibration isolation bearing constructed in such a manner of enclosing the turbine bearing and turbine axle to prevent vibration.
The cyclone turbine is formed with a plurality of flow channels (flow paths) inclined in an angle of predetermined degree so that liquids can pass therethrough by strong rotary power. The rotational rotor is formed on blades thereof with a plurality of grooves inclined in an angle of predetermined degree so that the rotor enables to smoothly rotate by high pressure of fluids passed through the flow paths (flow channels) of the cyclone turbine. The axle of the rotational rotor is designed so as to have the number of rotations less than that of the rotational rotor. The rotational rotor is fixedly inserted at the body thereof with a required number of magnets, or formed at a periphery of the body with a predetermined number of grooves, to detect the number of rotation.
Also, according to another embodiment of the present invention, the grooves formed on the body of the rotor is provided in the front thereof with a photo device to transmit or receive light. The size of the grooves which is flow channels of the rotor and cyclone turbine can be varied in response to the amount of flowing liquids (flow rate) which is supplied according to the work process.
In accordance with the objects of the present invention, a control system of the flowmeter comprises a sensor for detecting a va

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