JP2002090189A - Flow characteristic measuring device and flow characteristic measuring method of valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure flow characteristic data in a short time, even in the case of a large number of valves. SOLUTION: This flow characteristic measuring device 1 of a valve 14 for measuring characteristics of a valve opening of the valve 14 for controlling the flow rate of a fluid flowing in a pipe and the flow rate is equipped with a flow measuring means 15 for executing successively adjustment of the valve opening of the valve 14 and measurement of the flow rate of the fluid in the adjusted valve opening relative to the valve opening determined beforehand, and a correlation acquisition means 7 for acquiring correlation between the valve opening and the flow rate based on each flow rate measured by the flow measuring means 15 and on each valve opening in which each flow rate is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve flow characteristic measuring apparatus for measuring characteristics of a valve opening degree and a flow rate of a valve for controlling a flow rate of a fluid such as heavy oil, gas, water or air flowing in a pipe. And a method for measuring flow characteristics.

[0002]

2. Description of the Related Art Conventionally, heavy oil, gas, water,
When acquiring flow characteristic data of a valve that controls the flow rate of a fluid such as air, manually open the valve to adjust to a desired valve opening degree, measure the flow rate at the valve opening degree, and after the measurement is completed, manually operate the valve again. The valve is opened to adjust to another valve opening, and the flow rate is measured again at the valve opening. By repeatedly performing this, data of the flow rate with respect to the valve opening is acquired, and a characteristic graph showing the relationship between the valve opening and the flow rate is created using this data, or a characteristic data table is created. .

When determining the valve opening for the target flow rate, the valve opening is obtained by using the created characteristic graph and characteristic data table as calibration data.

[0004]

However, such a conventional method for measuring the flow characteristics of a valve has the following problems.

That is, in such a conventional method for measuring the flow characteristic of a valve, if the number of valves increases, it takes a long time to acquire the flow characteristic data.
There is a problem that fluid flow control must be stopped for a long time.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a first object of the present invention is to provide a method for obtaining flow characteristic data in a short time even when the number of valves for adjusting the valve opening is large. Provided are a valve flow characteristic measuring device and a flow characteristic measuring method capable of measuring and eliminating the need to stop the flow control of a fluid for a long time to acquire the flow characteristic data of the valve. It is in.

A second object is that even when flow rate characteristic data has already been obtained, flow rate characteristic data can be newly obtained and updated to the flow rate characteristic data. Even when the flow rate measured at the valve opening deviates from the desired flow rate, the flow rate characteristic data is updated, and the desired flow rate can be easily realized by using the flow rate characteristic data. It is an object of the present invention to provide a flow rate characteristic measuring device and a flow rate characteristic measuring method for a valve.

[0008]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, according to the first aspect of the present invention, there is provided a valve flow characteristic measuring apparatus for measuring a characteristic of a valve opening degree and a flow rate of a valve for controlling a flow rate of a fluid flowing in a pipe,
Flow rate measuring means for adjusting the valve opening of the valve, and measuring the flow rate of the fluid at the adjusted valve opening degree sequentially with respect to a predetermined valve opening degree, and each flow rate measured by the flow rate measuring means and each flow rate And a correlation acquisition unit for acquiring a correlation between the valve opening and the flow rate based on each measured valve opening.

Therefore, in the valve flow characteristic measuring apparatus according to the first aspect of the present invention, by taking the above-described means, the adjustment of the valve opening of the valve and the measurement of the flow at the adjusted valve opening are performed in advance. It can be performed sequentially for the determined valve opening. Further, based on the measurement result, it is possible to acquire the flow characteristics with respect to the valve opening for each individual valve.

According to a second aspect of the present invention, in the valve flow characteristic measuring apparatus according to the first aspect of the present invention, the valve opening degree with respect to the target flow rate is calculated based on the correlation acquired by the correlation acquiring means. A calculating means.

Therefore, in the valve flow characteristic measuring apparatus according to the second aspect of the present invention, by taking the above-described means, the flow characteristic with respect to the valve opening obtained for each valve can be calculated from the characteristic with respect to the target flow. The valve opening can be calculated.

According to a third aspect of the present invention, in the valve flow characteristic measuring apparatus according to the second aspect of the present invention, the difference between the flow rate and the target flow rate at the valve opening calculated by the valve opening calculating means is a predetermined predetermined value. If the value is larger than the value, the flow rate measuring means performs the adjustment of the valve opening degree of the valve and the measurement of the flow rate at the adjusted valve opening degree again sequentially with respect to the predetermined valve opening degree, and the correlation acquiring means. Updates the correlation between the valve opening and the flow rate based on each flow rate again measured by the flow rate measuring means and each valve opening degree at which each flow rate is measured again,
The valve opening calculating means calculates again the valve opening for the target flow rate based on the correlation updated by the correlation obtaining means.

Therefore, in the valve flow characteristic measuring apparatus according to the third aspect of the present invention, by taking the above-described means, the valve opening degree calculated based on the correlation between the valve opening degree and the flow rate can be obtained. If the obtained flow rate is significantly different from the target flow rate, the correlation can be obtained again, and the flow rate can be calculated based on the obtained correlation again.

According to a fourth aspect of the present invention, there is provided a method for measuring a valve opening degree of a valve for controlling a flow rate of a fluid flowing in a pipe and a flow rate characteristic of the valve for measuring a characteristic of the flow rate. Adjusting, and measuring the flow rate of the fluid at the adjusted valve opening degree is sequentially performed for a predetermined valve opening degree, and based on the flow rate result of the fluid measured at each valve opening degree, the valve opening degree is measured. And a flow rate of the fluid, and a valve opening degree with respect to the target flow rate is calculated based on the correlation.

Therefore, in the method for measuring the flow characteristic of a valve according to the fourth aspect of the present invention, by taking the above measures, it is possible to adjust the valve opening of the valve and measure the flow at the adjusted valve opening in advance. It can be performed sequentially for the determined valve opening. Then, based on the measurement result, a flow characteristic with respect to the valve opening is obtained for each valve, and the valve opening with respect to the target flow can be calculated from the flow characteristics.

According to a fifth aspect of the present invention, in the valve flow characteristic measuring method according to the fourth aspect of the present invention, when the difference between the calculated flow rate and the target flow rate at the valve opening is larger than a predetermined value. The step of adjusting the valve opening of the valve, the step of measuring the flow rate of the fluid at the adjusted valve opening is performed again sequentially for a predetermined valve opening, the predetermined valve opening and each valve The correlation between the valve opening and the flow rate is updated based on each flow rate measured again at the opening degree, and the valve opening degree for the target flow rate is calculated again based on the updated correlation.

Therefore, in the method for measuring the flow characteristic of a valve according to the fifth aspect of the present invention, by taking the above means, it is possible to obtain the valve opening calculated on the basis of the correlation between the valve opening and the flow. If the obtained flow rate is significantly different from the target flow rate, the correlation can be obtained again, and the flow rate can be calculated based on the obtained correlation again.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a functional block diagram showing an example of the overall configuration of a valve flow characteristic measuring apparatus to which a valve flow characteristic measuring method according to an embodiment of the present invention is applied.

A flow characteristic measuring apparatus 1 according to an embodiment of the present invention comprises a valve opening adjusting section 2, a changeover switch 3, a valve selecting section 4, a flow meter selecting section 5, a storage section 6, The apparatus includes a characteristic acquisition unit 7, a valve opening calculation unit 8, and display input means (not shown).

The valve opening adjustment section 2 is a device that can set the valve opening of the control valve 14 at a plurality of points. As shown in detail in FIG.
A plurality of timer units 11 (#a to #d) and a plurality of switching units 12 (#a to #d) corresponding thereto are provided.

The automatic opening control switch 10 for valve opening receives a selection input of the control valve 14 and an operation input.
A valve opening command signal for automatically adjusting the valve opening of the selected control valve 14 is output to the timer devices 11 (#a to #d).

FIG. 3 is a schematic diagram showing an example of a screen displayed on the display input means (not shown).

The selection input of the control valve 14 to the automatic opening control switch 10 is performed by designating a valve number on a valve selection switch V shown in FIG. The operation input instruction of the valve opening automatic adjustment start switch 10 is made by pressing the start switch S shown in FIG.

Each of the timer units 11 (#a to #d) is set with a timer, and each of the switching units 12 (##
a to #d). When the selection information and the operation input signal of the control valve 14 are received from the valve opening automatic adjustment start switch 10, after the preset timer has elapsed, the switch 12 connected to each of the switches is connected.
For (#a to #d), a valve opening command signal is output.

More specifically, the valve opening automatic adjustment start switch 10 outputs a valve opening command signal for setting the valve opening of the selected control valve 14 to a% with respect to the timer A11 (#a). In the same manner, the valve opening degree is b% for the timer B11 (#b), the valve opening c% for the timer C11 (#c), and the valve opening D% (#d) for the timer D11 (#d). Opening d
% Of the valve opening command signal, and the timer set in the timer unit 11A (#a) is time A,
Similarly, the timer set for the timer unit 11B (#b) is time B, the timer set for the timer unit 11C (#c) is time C, the timer set for the timer unit 11D (#d) is time D, and Time A <time B <time C <time D
In the case of, the respective timer units 11 (#a to #d)
When a valve opening command signal is received from the valve opening automatic adjustment start switch 10, the timer A11 (#a) first sends the valve opening a% to the switch A12 (#a) after the time A. Outputs command signal.

The switch A12 (#a) is connected to the timer 11
When a valve opening command signal is received from A (#a), this signal is output to the selected control valve 14 via the changeover switch 3 and the valve selector 4 to adjust the valve opening to a%.

Next, a time B after the timer B11 (#b) receives the valve opening command signal from the valve opening automatic adjustment start switch 10, the valve is opened to the switch B12 (#b). And outputs a valve opening command signal of degree b%, and switches B12 (#
In b), when the valve opening command signal is received, this signal is output to the selected control valve 14 via the changeover switch 3 and the valve selector 4 to adjust the valve opening to b%.

In the same manner, the timer C11 (#c) is similarly switched C12 (#c) after a time C from the reception of the valve opening command signal from the valve opening automatic adjustment start switch 10.
The switch C12 (#c) receives the valve opening command signal of the valve opening c% in response to the
This signal is output to the selected control valve 14 via the changeover switch 3 and the valve selector 4, and the valve opening is adjusted to c%.

Finally, the timer D11 (#d)
Outputs a valve opening degree command signal of the valve opening degree d% to the switch D12 (#d) after a time D after receiving the valve opening degree instruction signal from the valve opening automatic adjustment start switch 10; Switch D
12 (#d), upon receiving this valve opening command signal, outputs this signal to the selected control valve 14 via the changeover switch 3 and the valve selecting section 4 to adjust the valve opening to d%.

The valve opening adjusting section 2 automatically and stepwise adjusts the valve opening of the control valve 14 at a plurality of points as described above.

The changeover switch 3 is a switch for selecting an input side of a valve opening command signal to be output to the control valve 14, whereby the valve opening command signal from the valve opening calculating section 8 is transmitted to the control valve 14. Side or a valve opening command signal from each of the switches 12 (#a to #d) of the valve opening adjusting section 2 is output to the control valve 14 side.

The valve selecting section 4 receives a valve opening command signal from each of the switches 12 (#a to #d) of the valve opening adjusting section 2 via the changeover switch 3 or a valve opening command via the changeover switch 3. The control valve 14 that is the output destination of the valve opening command signal from the degree calculation unit 8 is selected, and the valve opening command signal is output to the selected control valve 14. As a result, the desired valve opening of the control valve 14 can be adjusted. The selected control valve 14 and its valve opening command signal are also output to the flow meter selection unit 5.

The flow meter selection unit 5 receives the valve opening command signal of the control valve 14 output from the valve selection unit 4.
Further, a flow meter 15 for measuring a flow rate controlled by the control valve 14 is selected, and a flow signal measured by the selected flow meter 15 is received and output to the storage unit 6. As a result, a flow signal corresponding to the valve opening is obtained for the flow meter 15. This will be specifically described with reference to FIG.

FIG. 4 shows that the material 17 to be rolled is
FIG. 2 is a conceptual diagram showing an example of a case where the flow characteristic measuring apparatus 1 according to the present embodiment is applied to a rolling step of cooling by cooling water 20 jetted from a nozzle pipe 19 while rolling using the method.

In this rolling step, a pump 21, a flow meter 15, and a control valve 14 are provided in series in a nozzle pipe 19, and cooling water 20 flowing through the nozzle pipe 19 is supplied to the pump 2.
1, a plurality of cooling systems 22 (# 1 to #n) whose flow rate is adjusted by the control valve 14 and whose flow rate is measured by the flow meter 15 are provided.

For such a rolling step, in the flow characteristic measuring apparatus 1 of the present embodiment, the valve selecting section 4 designates one of the plurality of control valves 14 (# 1 to #n) by the display input means. The selected control valve 14 is selected, and a valve opening command signal is output to the control valve 14 to adjust the valve opening.

For example, when the control valve 14 (# 1) is selected by the valve selector 4, the valve selector 4
While outputting a valve opening command signal to the control valve 14 (# 1) to adjust the valve opening, the control valve 14 (# 1) selected by the valve selector 4 and the valve opening command signal thereof are transmitted to the control valve 14 (# 1). It is also output to the flow meter selection unit 5.

The flow meter selecting section 5 selects a flow meter 15 (# 1) for measuring a flow rate controlled by the control valve 14 (# 1) based on the information, and selects the selected flow meter 15 (# 1). 1) receives the measured flow rate signal and outputs it to the storage section 6 together with the valve opening signal at this time.

The storage unit 6 is a device for storing the valve opening information output from the flow meter selection unit 5 and the flow rate signal at the valve opening for each flow meter 15, and FIG. As shown in the configuration, a switch 24 (#a to #d), a memory 25 (#a to #d), and an overall memory 26 are provided.

The switches 24 (#a to #d) correspond to the switches 12 (#a to #d) of the valve opening adjusting section 2, respectively. The switch 24A (#a) is connected to the switch 12A.
(#A) outputs the flow signal when the valve opening degree command signal is output to the flow meter 15 selected by the flow meter selection unit 5.
From the memory A25 (#a) together with the flow meter 15, the valve opening command signal at that time, and the flow signal.
To temporarily memorize it. Similarly, the switch 24 (#b
To #d) also correspond to the respective valve opening adjustment units 2.
Are obtained from the same flow meter 15 when the switching devices 12 (#b to #d) output the valve opening command signals, and the flow meter 15 and the valve opening command signals at that time are obtained. ,
The memory 25 (#b to #d) is temporarily stored together with the flow signal.

Thus, for example, the flow meter 15 (#
The valve opening degree and the flow rate for 1) are as follows: the valve opening degree a% and the flow rate signal at that time are stored in the memory A25 (#a), and the valve opening degree b% and the flow rate signal at that time are stored in the memory B25.
By (#b), the valve opening c% and the flow signal at that time are temporarily stored in the memory C25 (#c), and the valve opening d% and the flow signal at that time are temporarily stored in the memory D25 (#d). ing.

Each of the memories 25 (#a to #d) outputs the temporarily stored data to the entire memory 26.

As a result, the overall memory 26 acquires and stores the total flow rate signal measured at each valve opening of the corresponding control valve 14 for the selected flow meter 15, and outputs the signal to the flow rate characteristic acquiring section 7. I do.

The flow characteristic acquiring unit 7 creates and stores a flow characteristic graph or a flow characteristic data table, which is a characteristic of the flow rate with respect to the valve opening, for each control valve 14 based on the information output from the overall memory 26. It is output to the valve opening calculator 8. The created flow rate characteristic graph can be displayed by the above-mentioned display input means (not shown) as illustrated in FIG. When a new flow characteristic is acquired for the control valve 14 in which the flow characteristic is already stored, as shown in the graph of FIG. It is also possible to simultaneously display the newly created flow characteristic graph G2. When updating the already stored flow rate characteristic to the newly created flow rate characteristic, as shown in FIG. 3, the write switch R provided in the display input means is turned on to turn on the flow rate characteristic data. To update.

The valve opening calculating section 8 uses the flow characteristic graph or the flow characteristic database acquired by the flow characteristic acquiring section 7 as calibration data, and adjusts each control valve 14.
Is a unit that calculates the valve opening degree with respect to the set flow rate value, and includes a flow rate setting unit 28 and a calculation unit 29.

The flow rate setting section 28 receives a selection input of the control valve 14 whose flow rate is to be adjusted and an input of a flow rate value to be adjusted. Then, the arithmetic unit 29 calculates calibration data (a flow characteristic graph or a flow characteristic database) corresponding to the control valve 14 input to the flow setting unit 28,
The valve opening of the control valve 14 is calculated from the flow value input to the flow setting unit 28, and a corresponding valve opening signal is output to the control valve 14.

When the operation unit 29 outputs the valve opening signal for the control valve 14 in this way, the changeover switch 3 outputs this signal to the valve selection unit 4 side, and the valve selection unit 4 This valve opening signal is input to the adjusted control valve 14, and the valve opening of the control valve 14 is adjusted to a designated value.

In this embodiment, the timer 1
1, a configuration including four switches 12, four switches 24, and four memories 25 has been described as an example, but the number of switches is not limited to four. If more are provided, the number of valve openings that can be set collectively for the control valve 14 can be increased. The valve opening degree does not always correspond to the number of the timer units 11, the switching units 12, the switching units 24, and the memories 25. In the case where there are four timer units 11, the switching units 12, the switching units 24, and the memories 25, respectively. Even if there is, the same adjustment valve 14
By measuring the flow rate while changing the valve opening twice each time, the valve opening can be increased to 8, for example, the valve opening can be set to 8. If the number of the timer devices 11, the switching devices 12, the switching devices 24, and the memories 25 is large, naturally, even when the valve opening number is large, the valve opening adjustment and the flow rate measurement can be efficiently performed.

Next, the operation of the valve flow characteristic measuring apparatus to which the valve flow characteristic measuring method according to the present embodiment configured as described above is applied will be described with reference to the flowcharts shown in FIGS.

First, the operation in obtaining the flow characteristics of the control valve 14 will be described with reference to the flowchart shown in FIG.

When acquiring the flow characteristic of the control valve 14, first, the valve selection switch V of the display input means is used.
The number of the control valve 14 for obtaining the flow characteristic is selected,
From the valve opening automatic adjustment start switch 10, the valve opening of the control valve 14 (for example, 25%, 50%, 75%, 100%)
% 4 points) are input. Here, a plurality of control valves 14 are selected, and each control valve 14 is selected.
Can be set to different valve opening degrees. The valve opening degrees thus input are output to the timer devices 11 (#a to #d) as valve opening command signals, respectively (S
1).

The start switch S of the display input means is pressed, and an instruction to start an automatic valve opening adjustment operation is issued (S2).
First, the valve opening of the first selected control valve 14 is set to a% (25%) with respect to the timer A11 (#a).
A valve opening command signal is output. Similarly, the valve opening b% (50%) for the timer B11 (#b) and the valve opening c% for the timer C11 (#c). (75%)
Of the valve opening d% (1
00%) is output (S
3).

Then, the valve opening automatic adjustment start switch 10
, A time A after the valve opening command signal is transmitted to each timer 11, the valve opening a% (25%) from the timer A11 (#a) to the switch A12 (#a).
Is output to the first selected control valve 14 via the changeover switch 3 and the valve selection unit 4, and the valve opening is set to a% (25%). It is adjusted (S4).

At this time, the control valve 1 output from the valve selecting section 4 is supplied from the valve selecting section 4 to the flow meter selecting section 5.
A valve number and a valve opening command signal of No. 4 are output. Based on this, the first selected regulating valve 14
The flowmeter 15 for measuring the flow rate controlled by the flowmeter 15 is selected by the flowmeter selection unit 5 and the flowmeter 15
Is obtained (S5).

In this way, the flow meter selecting section 5 obtains the valve opening a% (25%) of the selected control valve 14 and the flow rate data at that valve opening. These data are further sent from the flow meter selection unit 5 to the storage unit 6. The flow rate data based on the valve opening degree command signal from the switching unit A12 (#a) of the valve opening degree adjustment unit 2 is taken into the memory A25 (#a) via the switching unit A24 (#a), and furthermore, the entire memory 26 and stored together with the valve number and the valve opening command signal (S6).

When the time B has passed since the valve opening command signal was transmitted from the valve opening automatic adjustment start switch 10, this time, the timer B11 (#b) is switched to the switch B12 (#).
b), a valve opening command signal of a valve opening b% (50%) is output.
Via the control valve 14 which is likewise selected first
And the valve opening is adjusted to b% (50%) (S
7: No → S4).

Then, the above-described steps S5 and S5
As described in 6, the flow meter selection unit 5 acquires the valve opening b% (50%) of the selected control valve 14 and the flow rate data at the valve opening, and obtains the valve number and the valve opening command. It is stored in the overall memory 26 together with the signal (S5, S5
6).

Further, when the time C has passed since the valve opening command signal was transmitted from the valve opening automatic adjustment start switch 10, the timer C11 (#c) switches to the switch C12 (#).
In response to c), a valve opening command signal having a valve opening c% (75%) is output, and the valve opening is adjusted to c% (75%), and as described in steps S5 and S6 described above. , The valve opening c% (75%) of the control valve 14 and the flow rate data at the valve opening are acquired and stored in the overall memory 26 together with the valve number and the valve opening command signal (S7: No)
→ S4, S5, S6).

The flow data is obtained for all the valve openings set in step S1, and this is repeated until the flow data is stored in the overall memory 26, and the acquisition and storage of the flow data for all the set valve openings are completed (S7: If Yes, the flow characteristic acquisition unit 7 performs a flow characteristic graph (correlation between the valve opening degree and the flow rate) for the first selected control valve 14 based on the information stored in the overall memory 26. A graph) or a flow characteristic data table is created (S8).

If a plurality of control valves 14 are selected in step S1 (S9: No), step S
By repeating the processing from 3 to step S8, a flow characteristic graph or a flow characteristic table is created for all the selected control valves 14, and output to the valve opening calculator 8.

When a new flow characteristic is obtained for the control valve 14 for which the flow characteristic has already been stored, it is already stored by the display input means as shown in the graph of FIG. Flow characteristic graph (old) G1
And the newly created flow characteristic graph G2 can be displayed at the same time.

As described above, when comparing the old and new flow characteristic graphs and updating the old flow characteristic to the new flow characteristic, the write switch R provided in the display input means is turned on to obtain the flow characteristic data. Is updated.

Next, the operation in the case of calculating the valve opening for the desired flow rate based on the flow rate characteristics thus obtained will be described with reference to the flowchart shown in FIG.

When a desired flow rate is realized by adjusting the valve opening of the control valve 14, first, the flow rate setting unit 2
In step 8, a selection input of a control valve 14 whose flow rate is to be adjusted and a desired flow value are input (S11).

The calculation unit 29 uses the flow rate characteristic graph or the flow rate characteristic database corresponding to the control valve 14 input to the flow rate setting unit 28 as calibration data, and determines the valve of the control valve 14 from the input flow rate value. An opening is calculated (S12).

When the valve number of the target control valve 14 and the valve opening information calculated in step S12 are input to the valve selecting section 4 via the changeover switch 3, the valve selecting section 4 Then, a valve opening command signal is output to the target control valve 14, and the valve opening of the control valve 14 is adjusted to the valve opening calculated in step S12 (S13).

The processes from step S11 to step S13 are performed until all the designated control valves 14 are performed. If the process has been performed for all the specified control valves 14 (S14: Yes), the valve opening adjustment process is performed. Complete.

As described above, in the valve flow characteristic measuring device to which the valve flow characteristic measuring method according to the present embodiment is applied, a plurality of timer devices 11 and a switch 12,
Each of the timer units 11 and the switching unit 12 continuously adjusts the valve opening degree of the control valve 14 at a plurality of predetermined intervals, and can measure the flow rate at the valve opening degree during the interval.

Further, each flow rate measured at the adjusted valve opening is stored in the switch 24 of the storage unit 6 provided corresponding to each switch 12 of the valve opening adjusting unit 2.
Are acquired, and by integrating the flow rates obtained by all the switches 24, the characteristic data of the flow rate with respect to the valve opening can be easily obtained in a short time.

As a result, even when the number of valve openings to be measured and the number of control valves 14 are large, the flow characteristic data can be measured in a short time.

Thus, even when the flow characteristic data of the control valve 14 is obtained, it is not necessary to stop the flow control of the fluid for a long time.

Even if the flow characteristic data has already been acquired, the flow characteristic data can be updated to the newly acquired flow characteristic data, so that the flow rate at the adjusted valve opening degree deviates from the desired flow rate. In such a case, the desired flow rate can be easily realized by updating the flow rate characteristic data and using the latest flow rate characteristic data.

As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. However, the present invention is not limited to such a configuration. Within the scope of the invented technical concept described in the claims, those skilled in the art will be able to conceive various modified examples and modified examples, and these modified examples and modified examples are also within the technical scope of the present invention. It is understood that it belongs to.

[0076]

As described above, according to the present invention,
Even if the number of valves for adjusting the valve opening is large,
Flow characteristic data can be measured in a short time.

As a result, it is possible to realize a valve flow characteristic measuring device and a flow characteristic measuring method which do not need to stop the flow control of the fluid for a long time in order to acquire the flow characteristic data of the valve.

Further, according to the present invention, even when the flow characteristic data has already been acquired, it is possible to newly acquire the flow characteristic data and update the flow characteristic data.

As a result, even if the flow rate measured at the adjusted valve opening deviates from the desired flow rate, the flow rate characteristic data is updated, and the desired flow rate characteristic data is used. A valve flow characteristic measuring device and a flow characteristic measuring method capable of easily realizing a flow rate can be realized.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an example of an overall configuration of a valve flow characteristic measuring apparatus to which a valve flow characteristic measuring method according to an embodiment of the present invention is applied.

FIG. 2 is a conceptual diagram showing a detailed configuration example of a changeover switch, a valve opening adjustment unit, and a valve opening calculation unit;

FIG. 3 is a schematic diagram showing an example of a screen displayed on a display input unit.

FIG. 4 is a conceptual diagram showing an example of a rolling process to which the flow characteristic measuring apparatus according to the embodiment of the present invention is applied.

FIG. 5 is a conceptual diagram showing a detailed configuration example of a storage unit.

FIG. 6 is a flowchart showing an operation when acquiring a flow characteristic of a control valve;

FIG. 7 is a flowchart showing an operation when calculating a valve opening degree with respect to a desired flow rate;

[Explanation of symbols]

 V: Valve selection switch S: Start switch G1: Flow characteristic graph (old) G2: Flow characteristic graph (new) R: Write switch 1: Flow characteristic measuring device 2: Valve opening degree adjustment unit 3: Changeover switch 4: Valve selection Unit 5: Flowmeter selection unit 6: Storage unit 7: Flow characteristic acquisition unit 8: Valve opening calculation unit 10 ... Valve opening automatic adjustment start switch 11: Timer unit 12, 24 ... Switch 14 ... Adjustment valve 15 ... Flow 17: Rolled material 18: Roll roll 19 ... Nozzle pipe 20 ... Cooling water 21 ... Pump 22 ... Cooling system 25 ... Memory 26 ... Overall memory 28 ... Flow rate setting unit 29 ... Calculation unit

Claims (5)

[Claims] An apparatus for measuring a valve opening degree of a valve for controlling a flow rate of a fluid flowing in a pipe and a flow rate characteristic of the valve, the valve opening degree of the valve being adjusted, and Measurement of the flow rate of the fluid at the adjusted valve opening degree, flow rate measurement means for sequentially performing a predetermined valve opening degree, each flow rate measured by the flow rate measurement means and each flow rate measured by the flow rate measurement means A flow rate characteristic measuring device for a valve, comprising: correlation acquisition means for acquiring a correlation between the valve opening degree and the flow rate based on the valve opening degree. 2. The valve flow characteristic measuring device according to claim 1, further comprising a valve opening calculating unit that calculates a valve opening with respect to a target flow rate based on the correlation acquired by the correlation acquiring unit. A flow rate characteristic measuring device for a valve. 3. The flow rate characteristic measuring device for a valve according to claim 2, wherein the difference between the flow rate and the target flow rate at the valve opening calculated by the valve opening calculating means is a predetermined value. If is also large, the flow rate measuring means adjusts the valve opening degree of the valve, and measures the flow rate at the adjusted valve opening degree again sequentially with respect to the predetermined valve opening degree, Correlation acquisition means, based on each flow rate measured again by the flow rate measurement means and each valve opening degree each flow rate is measured again, updates the correlation between the valve opening degree and the flow rate, The valve flow rate characteristic measuring apparatus, wherein the valve opening degree calculating means calculates the valve opening degree with respect to the target flow rate again based on the correlation updated by the correlation obtaining means. 4. A method of measuring a valve opening degree of a valve for controlling a flow rate of a fluid flowing in a pipe and a characteristic of the flow rate of the valve, wherein the valve opening degree of the valve is adjusted, The step of measuring the flow rate of the fluid at the adjusted valve opening degree is sequentially performed for a predetermined valve opening degree, and based on the flow rate result of the fluid measured at each valve opening degree, the valve opening degree is measured. A flow rate of said fluid is obtained, and a valve opening degree with respect to a target flow rate is calculated based on the correlation. 5. The flow rate characteristic measuring method for a valve according to claim 4, wherein a difference between the flow rate and the target flow rate at the calculated valve opening is larger than a predetermined value. Adjusting the valve opening of the valve, the step of measuring the flow rate of the fluid at the adjusted valve opening, again and again sequentially for the predetermined valve opening, the predetermined valve opening,
Based on each flow rate measured again at each valve opening degree, the correlation between the valve opening degree and the flow rate is updated, and based on the updated correlation, the valve opening degree for the target flow rate is updated. A method for measuring flow characteristics of a valve, wherein the calculation is performed again.