JPS6024420A - Flow-rate measuring device - Google Patents

Abstract

PURPOSE:To save cable installing costs and to eliminate a noise problem, by receiving the signals from a flow-rate-signal generator and a temperature measuring device, and providing a control device, which computes the value that is converted into the flow rate at a specified temperature, in the vicinity of a flowmeter. CONSTITUTION:Signals from a flowmeter 2 and a flow-rate pulse generator 4 and a signal from a temperature sensor 3 are inputted to a control device 5. A volume-converting-factor table is stored in the control device 5 in advance. The specific gravity of oil, which is measured by setting dials 6 and 7 and the correcting value of the instrumental error of the flowmeter are inputted in the control device. The converted volume is selected based on the signal from the sensor 3 and the specific gravity that is inputted before. The signal from the flow- rate generator 4 is corrected by the corrected value of the instrumental error that is inputted before. The computation is performed by the control device 5 and the flow rate is displayed on a display device 9. When the control device 5 is provided in the oil feeding site, cable working costs are a saved, noises are not generated, and the possibility of the breakout of fire can be prevented since the device is enclosed in an explosion-proof chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate measuring device installed at oil supply sites such as oil depots and oil refineries.

Mechanical and electrical types are used as flow rate measuring devices having a temperature correction function. In the case of a mechanical type, there is no need for explosion-proof measures, but since the bellows uses gears, etc., the minute amount of m* curvature is not transmitted accurately, making it impossible to accurately measure the temperature-corrected flow a.

In addition, in the case of an electric type, the temperature correction of the flow rate is accurate, but since electricity is used, conventionally, in order to measure the flow rate of flammable liquids such as petroleum, it has been necessary to install a A flow rate pulse transmitter that sends a flow rate pulse based on the measured flow rate and a Onmaro sensor that detects the temperature of the fluid are installed, and a control device, a ratio setting device, and an instrument error meter are installed in an office far from the refueling site.
It is equipped with a flow rate display needle after adjustment and temperature correction.

The outline of its operation is as follows.

A volume conversion coefficient table defined by JIS K-2249 is stored in the control device. Then, the specific gravity of the oil to be measured is input to the control device, and the flow rate of flow reduction is actually measured and the instrumental error correction value is input to the control device.

Next, the oil flow rate and the temperature signal detected by the dry skin sensor are input to the control device, and the volume II4I4 calculation table Mid) is selected based on the temperature signal and the specific gravity input earlier, and the temperature correction function is activated. Calculated.

Then, the signal from the flow rate pulse transmitter of the flowmeter is corrected by the previously input instrumental error correction value, and the temperature-corrected flow rate is calculated and displayed using the temperature correction coefficient, and the batch counter etc. will be communicated to.

By the way, as mentioned above, the conventional electrical type flow i measurement device that determines the temperature correction coefficient has the control device etc. installed in the office, so it may be somewhat large, and it may not have an explosion-proof structure. You don't have to.

For this reason, the temperature display from the temperature hinge, the display of the instrumental error correction value, the display of the set specific gravity, the display of the calculated temperature correction coefficient, etc., have been displayed using a CRT or a separate display meter. Note that the specific gravity setting and instrumental error adjustment are performed using a numeric keypad switch, etc.

However, in the case of the conventional method where the control device is installed in the office, the flow rate signal from the old flow rate pulse transmitter installed at the refueling site and the temperature signal from the temperature sensor are sent to the control device installed in the office using cables etc. There are problems in that the cable must be connected to a device, cable construction is troublesome, and it is susceptible to noise.

Therefore, an object of the present invention is to install an I11 control device at a refueling site, thereby solving the problems of the conventional Keboul] cost and noise.
To provide a flow rate measuring device that can be easily replaced with a flow cylinder with a temperature correction function of the II type.

According to the present invention, there is provided a flow rate signal transmitter that emits a flow rate signal based on the flow rate measured by the flow meter and the flow meter, a temperature measuring device that measures the thirst of the fluid, and a flow rate signal transmitter and a temperature measuring device. The flow signal transmitter and the control device are equipped with a control Tll device that calculates a value converted into a flow rate at a predetermined temperature based on the signal received by the control device, and a display “1” that displays the integrated flow rate calculated by the control device. A flow measuring device installed nearby is provided.

The following is a detailed description of the invention with reference to the drawings.

FIG. 1 shows an example in which each configuration of a flow rate measuring device according to the present invention is divided into blocks, and includes an oil supply pipe 1A provided between an oil storage tank (not shown) and a discharge nozzle (also not shown); A connecting pipe 1C equipped with a flow rate measuring device (described later) is connected between 1B and 1B, and the connecting pipe 1G
A flow meter 2 for measuring the flow rate of oil flowing inside the pipe and a temperature sensor 3 which is a measuring device for measuring the temperature of the oil are provided. A flow rate pulse transmitter 4 serving as a signal transmitter is provided for the flow driven by the flow meter 2, and a flow rate signal from the flow rate pulse transmitter 4 is inputted to the control device 5 as a pulse signal. Also, the temperature signal from the thermal sensor 3 is controlled in the same way! ! He was fired in the 5th place.

A volume conversion coefficient table defined by JISK-2249 is stored in advance in the control device 15. Further, as will be described later, the specific gravity of the oil to be measured through the setting die 7 and the instrumental error correction value of the flowmeter are respectively input into the device 5. Based on the oil flow 1, the temperature signal from the oil tanker 3, and the previously input specific gravity, the conversion volume is selected from the volume@conversion coefficient table, and the temperature correction coefficient is calculated by the control device 5. Further, the flow rate signal from the flow rate pulse transmitter 4 is corrected by the previously input instrumental error correction value, and the temperature-corrected flow rate is calculated by the control device 5 using that value and the temperature correction coefficient, and the integrated flow rate is displayed on the display meter 9. The corrected pulses are then output to a batch counter (not shown) or the like. Further, various memory values such as set specific gravity and instrumental error correction value set using the setting dial are displayed on a memory value table 10 by using a memory value change button 8, which will be described later.

Note that if it is not necessary to constantly display the cumulative flow rate, the cumulative flow rate may be displayed on the display meter 10 by pressing and switching the button 8 without using the display meter 9.

and a flow rate pulse transmitter 4, a control device 5, and a display meter 9.1.
0 is housed in an explosion-proof box 11.

When implementing the present invention, the following points are put into each line and actual tM is performed.

11) Since it is installed at the liquid supply site, it should be made smaller. For this reason, (a) various display meters are essentially shared.

(b) Turn the specific gravity setting dial to 6Δ as shown in Figure 2.
, 6B, and 6G, and the specific gravity can be set up to four digits using the three specific gravity setting dials 6A, 6B, and 6C. Oil measured at this flow rate H1 (crude oil, refined oil, LP)
G, etc.> takes advantage of the fact that there is no specific gravity greater than 1°2, and there is no specific gravity less than 0 or 5. Also setting dials 6A, 6B, 6G
A general rotary switch 16 with 10 contacts is used as the switch set by .

In order to be able to set up to 4 digits with the 3 specific gravity setting dials, the setting dial 6A which is 1/10 is used as J in the table below. "0" is rl, oI, I
'll is f"1.1-1, [°5] is ro, 5J, "6
" is set to ro, 6J, and below r9J is set to [0,9J, so that the underlined numerical value is displayed.

Scale Table 0 1.0 0.0 1 1.1 0.1 2 1.2 0.2 3 1.3 0.3 4 1.4 0.4 5 1.5 0.5 6 1.6 0 .6 7 1.7 0.7 8 1.8 0.8 9 1.9 0.9 (This table will be explained later) (c) The instrument difference adjustment dial is located on dial 7 as shown in Figure 2. One.

This instrumental error adjustment die self uses a normal type with 10 contacts, and in order to widen the adjustment range of instrumental error, it is fine where the instrumental error is small and coarse where the instrumental error is large. As a result,
Good first part; t li! j IQ is well corrected for instrumental errors, and those with poor spermatozoa are corrected to the extent that they are bad.

(d) The display change switch 4 for displaying various memory values on the display [110] is one of the switches 17 that are opened and closed by the push button 8 as shown in FIG. 2, and the control device counts the number of presses. to display various memory values.

(2) Measures should be taken to prevent changes to set values due to mischief or erroneous operation on site. For this reason, each setting dial
Do 2O and seal.

FIGS. 3 and 4 show the outline of the flow rate measurement work carried out according to the present invention. A flow meter 2 (see FIG. 1) is installed in the connecting pipe 1C which is flange-connected between the oil supply pipes 1A and 1B. The flow meter 2 is provided with an indicator 12 that indicates the flow rate before correction and a temperature sensor 3.
It is equipped with 4. Further, an explosion-proof box 11 is attached to the flowmeter 2, and a flow rate pulse transmitter 4 operated by the flowmeter 2 and a control device 5 equipped with a microcomputer that performs operations in the manner described above are provided in the box. There is.

The control device 5 has specific gravity setting dials 6A, 6 shown in FIG.
816C (hereinafter simply indicated by the symbol @6 if there is no need to distinguish between them), Instrument difference adjustment dial A full 7, display of various memory values (setting specific gravity, instrumental error correction value, etc.) Display change to i't 10 The button 8, the corrected flow rate display 19, and the memory numerical display meter 10 are connected to each other.Then, the flow rate pulse transmitter 4, the control device 5, the specific gravity setting Daicel 6, and the rotary switch for the instrumental difference adjustment dial 7 are connected. 16.16', 16.1
6, memory value change button switch 17, flow rate display meter 9,
A memory numerical display meter 10 and the like are housed in a field protection box 11.

FIG. 5 shows an example of how the specific gravity setting dial 6, instrumental difference adjustment dial 7, and memory value change button 8 are covered and sealed. llR by ~20? M2 that can
The bolt 20 is sealed with a wire 15. A hole is made in the swallow part corresponding to the memory value change button 8, and a screw swallow 18 is screwed into the hole, and the screw cap 18 is not sealed. Therefore, when displaying various memory values, the screw cap 18 can be removed and the memory values can be displayed without removing the M17.

Therefore, the specific gravity setting dials 6A, 6B, 6C: and the instrumental difference adjustment dial 7 are set in advance during flow rate measurement work. For example, in the case of heavy oil with a ratio ■ of 1.057, set the setting dial 6A to "0" and set the setting dial 6B to "
5" and the setting dial 6C to "7". Also, when setting oil with ratio fio, 728, set the setting dial 6A to [7], and set the setting dial 6B to "2".
” and set the setting dial 6C to “8”. Setting Daicel 6A is as shown in the table above.
2[,1゛3'' and ``4j are not normally used.

The reason for this is that oils with a specific gravity of 1.2 or more and 0.5 or less cannot be used practically.

With these three setting dials, the specific gravity is 1/100.
It can be set up to the 0 digit.

The instrument error adjustment die full 7 has a log scale, and by doing so, as described above, the areas where the instrumental error is small are fine and the areas where the instrumental error is large are coarse. This is also set after detecting the instrumental error with the ml meter. Note that the X mark in the figure is a contact point for the dummy pulse. .

When the settings of each specific gravity setting dial and the instrumental difference adjustment dial 7 are completed in this way, the lid 19 is closed and sealed with the wire 15, so that the set values cannot be changed. These set values and other memory values are displayed on display 8110 by pressing button 8. For example, if you press button 8, the set specific gravity will be displayed, if you press it once again, the set value of the instrument difference will be displayed, and if you press it one more time, other memory values will be displayed, and if you press it several times, it will return to the previous setting. It looks like this.

This button 8 can be easily operated by removing the lid 18.

The switches 16 and 17 are located inside the explosion-proof box 11, and the dials 6 and 7 and buttons 8, which are their actuators, are located outside the box 11, so when setting them, they are located outside the box 11. , there is no need to open the box 11 when setting them, and therefore there is no danger even if the setting operations are performed on site.

As explained above, the present invention provides a flow rate signal transmitter, a temperature measuring device for measuring the temperature of the fluid, a flow rate signal transmitter, and a temperature trace measuring device in response to signals from The control device that calculates the value converted to flow rate is installed near the flow foot screen 1 along with the display word 1 that displays the flow rate set by the fril control device. This eliminates the need for cable work, etc., and eliminates noise problems. Furthermore, if the flow rate signal transmitter and control device are housed in an explosion-proof box, there is no risk of fire occurring from these devices that use electricity.

[Brief explanation of drawings]

FIG. 1 is a piping and wiring diagram showing a block diagram of an outflow measuring device embodying the present invention. FIG. 2 is a front view of a specific gravity setting dial, an instrumental difference adjustment dial, and a memory value changing button used in a flow rate measuring device according to an embodiment of the present invention. 3 and 4 are external views of a flow system measuring device embodying the present invention, with FIG. 3 being a front view and FIG. 4 being a side view. FIG. 5 is a longitudinal cross-sectional view partially showing a side view of a lid covering a specific gravity setting dial, an instrumental difference adjustment dial, and a memory value changing button used in a flow rate measuring device according to an embodiment of the present invention. IA, IB...Oil supply pipe 1C...Connecting pipe 2...
- Flow meter 3... Temperature sensor 4... Flow rate pulse transmitter 5... 1ilJ all device 6... Specific gravity setting dial 7... Instrument difference adjustment dial 8... Memory value change button 9. ...Flowmeter display meter 10...Various menu numerical display meters 11...Explosion-proof box 12...Display for displaying the operating status of the flowmeter 81 Fig. 1 Fig. 5 Fig. 2

Claims (1)

[Claims] A flow rate signal transmitter that emits a flow rate signal based on the 8iE amount measured by the flowmeter, a temperature measuring device that measures the dryness of the fluid, and a 1jlt amount signal transmitter that receives signals from the temperature measuring device. It has a control device that extracts l111, which is converted into a flow rate at a predetermined temperature, and a display meter that displays the flow rate calculated by the vj control device, and the flow signal transmitter and the control device are located near the flow meter. A flow rate measuring device characterized by being installed.