JPS63120973A - Operating method for automatic control valve - Google Patents

Abstract

PURPOSE:To make the property of signal-flow in the linear relation by storing the property of control signal-flow rate in the preliminary operation, as the inverse function thereof, thereby distorting the property of input-valve opening in the real operation. CONSTITUTION:Prior to the real operation of a line system including an automatic control valve 2, the preliminary operation is performed in the change of a signal 3 in an adjustor from a minimum to a maximum so that the property of signal-flow rate of the line system including the automatic control valve 2 in the whole adjusting range is stored in a memory 9. And then, the inverse function of the property is operated by means of an inverse function operator 7 so as to be inputted into the memory of an equalizer 6. In the real operation, the property of input signal-valve opening, which makes the property of input signal-flow rate linear, is calculated with the inverse function out of the inverse function operator 7 so that a distorted signal is inputted into a positioner 4.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to an automatic control valve that is automatically fabricated based on a signal from a control section, and in particular, to an automatic control valve that receives a signal from the control section and applies the driving force necessary for operating the pulp to the pulp valve. This invention relates to a method of operating an automatic control valve that receives external force from an actuator.

(Prior Art) Conventionally, in order to control temperature, pressure, etc., a signal from a control unit operates a cutter, adjusts the opening degree of a valve body, and controls the flow rate of fluid flowing through a pipe. A self-actuating automatic control valve is known.

However, in such externally operated automatic control valves,
For the reasons described below, the signal from the regulating section input to the pulp 7 cutuator and the flow rate controlled by the valve did not exhibit linear characteristics.

In other words, Pr51 shows that the flow rate characteristic indicating the relationship between the flow rate of the valve itself and the opening degree is not linear, and secondly, the pressure difference before and after the valve body changes with the pulp opening degree and is not constant, and the way it changes depends on the pressure source. This is because they vary widely depending on characteristics, piping, and load characteristics.

In order to solve this problem, a system has been proposed in which the feedback characteristic of the positioner that positions the drive actuator of the control valve is set to be the opposite of the flow rate characteristic of the valve itself.

However, with such measures, there are a wide variety of pressure source characteristics, pipelines, and load characteristics that are related to fluctuations in differential pressure and fluctuations in differential pressure, so in reality, the flow rate of the automatic control valve and the signal of the adjustment section It was not possible to create a linear relationship. Rather,
On the contrary, there were even cases where the flow characteristics deteriorated.

(Problems to be solved by the invention) This invention solves the problem of the non-linear flow rate characteristics of the first valve itself and the differential pressure caused by the wide variety of pressure source characteristics, pipelines, and load characteristics of fjS2. The present invention is designed to appropriately deal with any of the causes and to create a linear relationship between the flow rate and the flow rate characteristics of the adjusting section.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention is to change the signal of the control part over the entire range during preliminary operation, and to control the entire piping system including the automatic control valve. In actual operation, input the input signal of node 7A with the inverse function - input so that the pulp passing flow rate becomes linear -
The present invention is characterized in that the pulp opening characteristic is distorted and the opening of the automatic control valve is controlled using the distorted signal.

(Function) Before performing the actual control operation by the automatic control valve, i$'1
A preliminary operation is performed by changing the signal of the ff15 section from the lowest to the highest, and the control signal flow rate characteristics of the piping system including the automatic control valve are stored in the memory. (Learning operation). Next, this characteristic is made into an inverse function and stored.

In actual operation, the input-pulp opening characteristic is distorted by the inverse function of the input signal of the adjustment section so that the input-pulp passing flow rate becomes linear. This distorted signal is input to the bonosilane, which drives the valve actuator to position the pulp opening in proportion to the distorted signal.

As a result, the actual characteristic and the reverse characteristic cancel each other out, and the total characteristic becomes linear, so that it becomes possible to operate the automatic control valve in a state where the signal flow rate characteristic of the adjustment WJ section is linear.

! If the pine conditions change, the learning operation may be performed again to store the inverse function of the signal flow rate characteristics of the piping system.

(Effects of the Invention) According to the present invention, since the automatic control valve can be operated under the linear flow rate characteristics of the signal flow of the adjustment section, the first and second causes, which were previously impossible, can be solved. In addition to being able to completely resolve fixed points during operation, the signal flow rate characteristics are learned during the preliminary operation prior to the actual operation, so it can be applied to any piping system, and it can also handle changes in passbook conditions. You can deal with it just by learning again. Furthermore, the inverse function can be automatically set by the inverse function calculator by simply performing a preliminary operation and inputting it into the memory, making repeated production extremely simple.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, (1) is a pipe constituting the thread path from the pressure source to the terminal pressure device, and (2) is an automatic control valve that controls the flow rate of the pipe (1), which is controlled by the signal (3) from the regulator. Automatically controlled. (4) is a bonotioner, which drives the automatic control valve (2).
) Made by! The IIJ amount is determined in response to the signal (3) of the adjustment section. Positioner (4) and valve actuator (5)
) is subjected to feedback control to ensure that the control amount of the valve opening matches the target value. An equalizer (6) is inserted before the Bozoshi 1 car (4), and the reverse rlJ math operation B described later
The input signal-valve opening characteristic that linearizes the input signal flow rate characteristic is calculated by the inverse function from at (7), and the signal distorted by this is output to Bono Synar (4), and this output Depending on the signal, the positioner (4) selects a required positioning amount and outputs a required actuation signal to the valve actuator (5).

Inverse function performance! [In (7), the key sr? 1! The signal flow characteristics provided by the signal (3) and the signal from the flow sensor (8) inserted into the pipe (1) are stored in the memory (9).
Input via .

The inverse function calculator (7), the signal (3) of the adjustment H section, the flow rate sensor (8), and the memory (D) constitute a learning function circuit, which operates as follows.

That is, prior to the actual operation of the pipeline system including the automatic control valve (2), a preliminary adjustment is performed by varying the signal (3) of the adjustment section from the minimum to the maximum, and the automatic control valve ( The signal flow characteristics of the piping system including 2) are stored in memory (9
). Next, we use the inverse function operation fl(7) to inverse l! of this characteristic. Calculate the I number and store it in the memory of the equalizer (6). This completes the learning of the signal-flow ffl characteristics of the IrI system including the automatic control valve (2).

Next, when we start the actual operation, we get the inverse function operation! Using the inverse function from (7), the input signal-pulp opening characteristic that makes the input signal flow rate characteristic linear is calculated, and the distorted signal is created by the fact that the actual characteristic and the inverse characteristic are different from each other as shown in Figure 12. Since the total is substantially linear, if this distorted signal is input to the valve 7 controller (4) and the valve 7 actuator (5) is operated, the automatic control valve (2) will have a 31
It shows a linear flow rate characteristic with respect to the signal (3) of the ffli section.

Even when temperature control is performed using a three-way valve, if the automatic control valve for cold water and the automatic control valve for hot water are made linear in the signal flow rate characteristics of the regulating section by the method of the present invention, the mixed water The flow rate can be made constant regardless of the opening degree of both valves.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the present invention, and fiS2 is a chart showing signal flow rate characteristics. (1)...Pipe line (2...F
3! ! ! llJ control valve (3)...Controller signal (4
)...Bonotioner (5)...Pulp actuator (6)...Equalizer (7)...Inverse function calculation Iso (8)...Flow rate sensor (9)...Memory patent applicant Co., Ltd. Voluntary action to amend the procedure (probably because of the Tomoe Technology Research Institute District Act) April 23, 1985 1. Cow display 1986 Patent M No. 264689 2. Name of invention Method of operating automatic control valve 3. Amendment Relationship with the case of the person who filed the patent application Address: 1 name, 2-91 Honjo Naka, Higashiosaka City, Osaka Prefecture
Tomoe Technical Research Institute 4, Representative Address: Nishiwaki Building (26), 4-1 Kojimachi, Chiyoda-ku, Tokyo
4) 7792 Specification 6, Contents of amendment (1) On page 6, 1m, 6th line of the specification, ``J'' is corrected as ``9J by the inverse function of...''.

Claims (1)

[Claims] (1) In preliminary operation, the signal of the control section is changed over the entire range to memorize the inverse function of the signal flow rate characteristics of the piping system including the automatic control valve, and during actual operation, the input signal of the control section is changed to the inverse function of the signal flow rate characteristic of the piping system including the automatic control valve. 1. A method for operating an automatic control valve, characterized in that the input-flow characteristic is distorted by a function so that it becomes linear or a given function, and the opening degree of the automatic control valve is controlled by the processed signal.