JP2002228533A - Measuring device and measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of stagnation of a fluid to be measured caused by stagnation of the fluid generated in the cylinder of the inside face in the radial direction of a measuring conduit branched in the middle of a pipe to be measured in a conventional pressure measuring instrument. SOLUTION: This pressure measuring instrument is equipped with a pressure sensitive block 2 wherein the fluid flows inside, having a thin-walled part 3 having the thinner thickness than the thickness of other parts, and a strain gage 5 installed on the different side from the flowing side of the fluid in the thin-walled part 3, for detecting the deformation quantity of the thin-walled part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device and a measuring system for measuring, for example, the pressure of a fluid flowing in a piping path.

[0002]

2. Description of the Related Art As a conventional pressure measuring device for detecting the pressure of a fluid flowing in a tubular pipe, as shown in FIGS.
A pressure detector f such as a Bourdon tube pressure gauge having a pressure receiving portion e such as a diaphragm for detecting the pressure of a fluid d to be measured, and a pressure gauge f utilizing a semiconductor gauge is provided in a measurement conduit c branched in the middle of the measurement. Attaching was common. FIG. 15 is a schematic diagram for explaining a conventional sanitary pipe connection type pressure measuring device, and FIG. 16 is a schematic diagram for explaining a conventional general screw-in type pressure measuring device.

[0003]

However, in the configuration for detecting the pressure of the fluid d to be measured as described above, the inside of the cylinder g on the radially inner surface of the measuring pipe c branching in the middle of the pipe b to be measured. Fluid stagnates and the measured fluid d stays.

[0004] For example, when the fluid d to be measured is food such as milk, ketchup, mayonnaise, etc., the fluid d to be measured stays in the cylinder g and is left as it is for a long time. It rots and becomes a factor of generating bacteria and the like. For this reason, the pipe to be measured b is frequently removed from the front and rear pipes a, and the pipe to be measured b and the in-cylinder g of the measuring pipe c are removed.
Had to be washed.

[0005] Also, when the fluid d to be measured is a paint used for decoration or the like, as described above, the fluid stagnates in the cylinder g, and the fluid d to be measured stays. For this reason,
If the color of the paint is changed and the liquid is sent, the color of the paint currently sent may be mixed with the color of the paint sent last time.

The fluid d to be measured is a paint in which ceramic particles and a binder and an organic solvent are mixed and dispersed for use in the field of electronic equipment and battery manufacturing, or a positive electrode and a negative electrode active material which are indispensable for the construction of a battery. Is mixed and dispersed with water or an organic solvent together with a binder, as described above, the paint stagnates in the cylinder g, and the fluid d to be measured stays. As the liquid sending time becomes longer, particles (so-called solids) contained in the coating material gradually remain in the cylinder g, and water or an organic solvent as a solvent and binders flow.
For this reason, in the staying portion, the concentration of water or an organic solvent serving as a solvent contained in the coating material is lower than the concentration at the time of forming the coating material, and the solid content increases in a gel state. . As a result, the pressure measurement at the time of liquid sending may not be performed properly. In addition, in the vicinity of the measuring conduit c branching in the middle of the pipe to be measured b, turbulent flow occurs when the fluid to be measured d is fed, so that the pipe resistance tends to increase. It is considered that the measurement cannot be performed properly.

The present invention has been made in consideration of the above-described conventional problems, and provides, for example, a measuring device and a measuring system capable of measuring the pressure of a fluid without substantially inducing stagnation of the fluid sent in a pipe. The purpose is to provide.

[0008]

Means for Solving the Problems The first invention (claim 1)
Corresponds to) a tubular member in which the fluid flows inward, where the thickness of a predetermined portion is thinner than the thickness of the other portion, and on the side different from the side of the predetermined portion where the fluid flows. A measuring device provided with a detecting means for detecting an amount of deformation of the predetermined portion.

According to a second aspect of the present invention (corresponding to claim 2), the result of the detection by the detecting means is based on the pressure of the fluid and / or
Alternatively, it is the first measuring device of the present invention used for calculating the viscosity.

A third aspect of the present invention (corresponding to claim 3) is the measuring device according to the first or second aspect of the present invention, in which all or a part of the inside of the tubular member is thin-film coated with a predetermined thin film. is there.

A fourth aspect of the present invention (corresponding to claim 4) is a temperature detecting means for detecting a temperature of the predetermined fluid, which is provided on a side of the predetermined portion different from a side on which the fluid flows. It is a first or second measuring device of the present invention comprising:

According to a fifth aspect of the present invention (corresponding to claim 5), a torsion preventing groove is provided outside the tubular member to suppress deformation of the tubular member due to torsion accompanying the flow of the fluid. A first or second measuring device of the present invention.

According to a sixth aspect of the present invention (corresponding to claim 6), the present invention provides a tubular member in which a fluid flows inward, wherein a predetermined portion has a smaller thickness than other portions; A measuring device provided on a side of the portion different from the side on which the fluid flows, and detecting means for detecting an amount of deformation of the predetermined portion, and a fluid supply for supplying the fluid to the tubular member It is a measurement system provided with a device.

A seventh invention (corresponding to claim 7) is the measurement system according to the sixth invention, further comprising control means for controlling the supply based on the result of the detection.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, FIGS.
The configuration of the pressure measuring device according to the present embodiment will be described with reference to FIG. FIG. 1A is a plan view of the pressure measuring device according to the present embodiment, and FIG.
FIG. 1B is a cross-sectional view taken along line AA ′ of the pressure measuring device, and FIG.
(C) is a schematic diagram comprising a BB ′ cross-sectional view of the same pressure measuring device and an enlarged view near the thin portion 3.

The pressure measuring device according to the present embodiment is provided with a square pressure-sensitive block 2 at a predetermined position of a pipe 1 to be measured having an outer diameter and an inner diameter equivalent to that of a fluid passage pipe connected before and after. Is provided.

The external diameter of the pipe to be measured 1 is 17.3 m.
mφ, the inner diameter is 14.0 mmφ, and the external dimensions of the pressure-sensitive block 2 are 30 mm square cubes. Of course, the dimensions of the external shape are not particularly limited, and it is best to change the dimensions to optimal values based on the required implementation specifications.

As shown in FIGS. 1 (b) and 1 (c), the pressure-sensitive block 2 has a thin portion 3 formed in the liquid flowing direction. The thin portion has a thickness in the radial direction of 0.5 mm.
However, the thickness of the thin portion will be described in detail in Example 1 below.

In the pipe to be measured 1 provided before and after the pressure-sensitive block 2, two bending stress relaxation grooves 4 are provided so as to be dug. The bending stress relaxation groove 4 is provided for absorbing or relaxing a torsional stress and a bending stress applied from a pipe connected before and after the pipe 1 to be measured.

Of course, the method of manufacturing the external shape shown in FIG. 1 is not limited to a method of cutting from one material, but a method of manufacturing and assembling each part separately, or using a mold or the like. It may be manufactured by an injection molding method. In addition, it is desirable to use stainless steel which is a corrosion resistant alloy or an alloy similar thereto as the material to be used. In the first embodiment, SUS304 is used, but SUS316, SUS316L, or the like may be used.

Since a pressure measuring device for measuring a fluid pressure in a pipe is provided, it is needless to say that a means for connecting to a pipe to be measured must be provided. In the present embodiment, the means is not shown in the drawings because the focus is only on the part for measuring the pressure. However, specifically, a method for performing pipe connection by providing a rule for both ends for sanitary pipes Alternatively, there is a method in which a general flange is provided at both ends, and the flange is attached to a pipe to be measured by a mounting screw.

As shown in FIG. 1 (c), cutting is performed from the upper part of the pressure-sensitive block 2 toward the radially inner surface of the pipe 1 to be measured, instead of penetrating the inner surface of the pipe through which the liquid flows. The inner surface of the pipe is processed so as to remain as the thin portion 3.

The tubular member of the present invention is a pressure-sensitive block 2
And the detecting means of the present invention is a strain gauge 5
Corresponding to the means. The measuring device of the present invention corresponds to the pressure measuring device of the present embodiment.

Next, the operation of the pressure measuring device according to the present embodiment will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A is a schematic diagram including a plan view of the pressure measuring device provided with the strain gauge 5 in the present embodiment and an enlarged view of the vicinity of the thin portion 3, and FIG. It is BB 'sectional drawing of a measuring device.

The liquid flowing in the pipe is constantly applied with a uniform expansion force from the center of the pipe to the outer peripheral surface. This expansion force is uniformly applied to the thin portion 3, and the thin portion 3 is distorted (deformed) so as to expand outward because it is thin.

The strain gauge 5 provided on the thin portion 3 of the pressure-sensitive block 2 outputs a pressure signal indicating an outward expansion amount or a distortion amount (change amount) as an electric signal.

Here, it is desirable that the strain gauge 5 used has a gauge pattern of a uniaxial gauge, and since the strain area is small in the first embodiment, the gauge length is small. Optimal. In addition, since the resistance value of the strain gauge 5 changes depending on the temperature, it is desirable to use a self-temperature compensation type, and at the same time, use a strain gauge having characteristics matching the linear expansion coefficient of the material of the pressure-sensitive block 2. Is desirable.

Next, the output of the electric signal by the strain gauge 5 will be described in more detail with reference to FIG. 5, which is a radial cross-sectional view for explaining the mounting structure of the strain gauge 5, with reference to FIG. As described above, a lead wire provided on the strain gauge 5 and a cable 8 for outputting an electric signal to the outside are connected around the thin portion 3 by means such as soldering. The cable connection portion 6 is filled or sealed with a filler 7 (such as an epoxy-based fixing agent). By such filling or sealing, exposure to moisture in an environment of use or an atmosphere of an organic solvent was prevented, so that durability against the environment could be provided.

When the strain gauge 5 is attached to convert the above-mentioned strain amount into an electric signal, a bridge circuit is formed by the strain gauge 5 regarded as a resistor, and the change amount is efficiently extracted.

In the first embodiment, by forming a bridge circuit (Wheatstone bridge circuit), the amount of distortion is efficiently extracted as an electric signal. More specifically, a Wheatstone bridge circuit is formed by the attached strain gauge 5, a voltage of 5.000 V is applied from one end of the bridge by a reference voltage generator (not shown), and a voltmeter (not shown) is applied to the other end. ) And measure its voltage.

As a result of such voltage measurement, FIG.
As shown in (a) and (b), good results were obtained in both linearity and hysteresis. FIG. 6 (a)
FIG. 6 is an explanatory diagram for explaining a voltage measurement result of an electric signal taken out by the strain gauge 5, and FIG. 6B is a graph for explaining the voltage measurement result.

As is clear from the above description, the pressure measuring device of the present embodiment is a conventional pressure detector (FIGS. 15 and 1).
6), the pressure value can be detected immediately after the liquid is passed, and the pipe is not branched in the liquid flow pipe.
No stagnation occurs.

(Embodiment 2) Next, the configuration and operation of a pressure measuring device according to the present embodiment will be described with reference to FIG. FIG. 7 shows the second embodiment.
FIG. 3 is a sectional view in a liquid flowing direction of the pressure measuring device in FIG.

The pressure measuring device of the present embodiment has an appearance and a configuration similar to those of the pressure measuring device of the first embodiment described above.
The fluororesin 9 was coated on the thin film.

Here, the coating method may be a general coating and sintering method at a high temperature, but may be a CVD (Chemical Vapor Depos) performed at a low temperature.
It is desirable to carry out a coating treatment by a method such as the formation of a gas phase chemical reaction thin film during plasma discharge under vacuum or in a vacuum.

Although the entire surface of the pipe 1 to be measured is coated with the fluororesin 9 to a thickness of about 50 μm, the method of coating the fluororesin 9 after forming the thin-walled portion 3 requires heat treatment at a high temperature. The thin portion 3 may be cracked due to expansion and a sudden change in stress. Therefore, in the second embodiment, after forming the inner surface of the pipe 1 to be measured, the fluororesin 9 is formed, and then the thin portion 3 is formed.

Although the detection sensitivity of the strain gauge 5 attached to the thin portion 3 is several percent lower than the above-described configuration of the first embodiment, it can be compared with that of the first embodiment by performing sensitivity calibration. Pressure detection can be performed.

As is clear from the above description, the pressure measuring device of the present embodiment is a conventional pressure detector (FIGS. 15 and 1).
6), the pressure value can be detected immediately after the liquid is passed, and the pipe is not branched in the liquid flow pipe.
No stagnation occurs.

Conventionally, when a different kind of liquid is passed, the residual liquid that has been passed last time is likely to adhere to the inner surface, has poor corrosion resistance, and has a small amount of metal ions (Fe) from the inner metal surface. Etc.), which may contaminate the fluid in the tube. In the second embodiment, by coating the inner surface of the pipe 1 to be measured with the fluororesin 9, it is possible to prevent not only the adhesion of the residual liquid that has been previously passed but also the prevention of adhesion.
Further, the corrosion resistance is improved, and the occurrence of contamination of the fluid by metal ions can be eliminated.

(Embodiment 3) Next, the configuration and operation of a pressure measuring device according to the present embodiment will be described with reference to FIG. FIG. 8 shows the third embodiment.
FIG. 3 is a sectional view in a liquid flowing direction of the pressure measuring device in FIG.

The pressure measuring device according to the present embodiment has an appearance and a configuration similar to those of the pressure measuring device according to the first embodiment described above. The temperature detecting element 10 was attached adjacent to or adjacent to the same position as that of No. 5. By attaching the temperature detecting element 10 to the thin portion 3, the temperature of the fluid to be passed can be accurately detected and displayed.

A configuration in which the temperature detecting portion is protruded into the pipe is generally used. In this case, however, turbulence and resistance are likely to occur in the fluid when the liquid is passed. Moreover, stress due to turbulence and resistance accumulates in the temperature detection unit, and eventually the temperature detection unit is damaged, causing problems such as contamination in the piping or loss of the inner surface. In order to solve these problems, a temperature detecting element 10 is attached to the thin portion 3 adjacent to or adjacent to the same position as the strain gauge 5 to simultaneously detect and display the pressure value and the fluid temperature of the flowing fluid. It was made possible to manage.

As is clear from the above description, the pressure measuring device of the present embodiment is a conventional pressure detector (FIGS. 15 and 1).
6), the pressure value can be detected immediately after the liquid is passed, and the pipe is not branched in the liquid flow pipe.
No stagnation occurs.

In addition, unlike the prior art, it is not necessary to adopt a configuration in which the temperature of the flowing fluid is detected by a sensor of another system.
According to the configuration of the third embodiment, since the temperature can be detected simultaneously with the pressure, the length of the liquid passage pipe can be shortened, and efficient liquid supply management can be performed.

(Embodiment 4) Next, the configuration and operation of a coating system according to the present embodiment will be described with reference to FIG. FIG. 9 shows Embodiment 4 of the present invention.
1 is a configuration diagram of a coating system in FIG.

The coating system of the present embodiment has a pressure measuring device 14 having the same configuration as the above-described pressure measuring device of the present embodiment immediately before the coating nozzle 15.

In the following, the operation of the coating system according to the present embodiment will be described, taking as an example a coating process for forming a battery electrode plate or a color filter, and manufacturing a ceramic sheet or the like used in connection with electronic components.

Using the pump 12, the paint in the supply tank 11 is supplied and fed into the pipe 13, and the paint is discharged in a uniform curtain shape in the width direction from the discharge slit 16 of the coating nozzle 15 provided at the tip of the pipe. I do.

However, the paint used for manufacturing the battery electrode plate has a different material and viscosity depending on the polarity of the electrode plate. Water or an organic solvent is generally used as a solvent for forming a paint. Particularly, in the case of a paint using an organic solvent as a solvent, the volatility may increase depending on the solvent composition. Then, such a volatilizing action tends to cause a change in the viscosity of the paint.

In such a case, as shown in FIG. 10 which is a graph showing the change of the discharge amount with time for explaining the lower limit value of the discharge amount, the discharge amount of the pump 12 is changed after a lapse of a predetermined time.
In some cases, point A (a point at which a so-called discharge amount lower limit is given) is reached, and a desired discharge amount cannot be obtained.

Therefore, as shown in FIG. 9, the discharge amount rotation speed of the pump 12 is set from the set value input 17, and the controller (C
PU) 18, through an output signal converter 19,
The pump controller 20 instructs the pump 12 on the number of revolutions of the discharge amount of the pump 12 corresponding to the set value.

More specifically, the discharged paint passes through the inside of the pipe 13 and is uniformly discharged in the width direction in a curtain shape from the discharge slit 16 of the application nozzle 15 as described above.

The pressure measuring device 14 provided immediately before the application nozzle 15 displays the pressure of the paint while the liquid is being fed stably on the pressure display 21. This pressure value is based on the input signal A / D.
The signal is fed back from the converter 22 to the controller (CPU) 18. Then, the set value of the discharge rotation speed input from the set value input 17 and the measured pressure value from the pressure display 21 are matched in the controller (CPU) 18 and stored.
The thus-measured pressure value and the set value of the number of rotations of the discharge, which are matched as described above, become reference values in the coating process.

When the viscosity of the paint in the supply tank 11 changes due to factors such as evaporation of the solvent, the discharge amount of the paint sent from the pump 12 tends to gradually decrease.
When such a decrease in the discharge amount occurs, (1) when the pressure measuring device 14 recognizes the decrease in the discharge amount from the detected pressure value, the pressure measurement device 14 displays the pressure value on the pressure display 21 and the input signal A / D converter 22. (2) The controller (CPU) 18 adjusts the feedback pressure value to the reference value after the feedback pressure value matches the stored reference value. Sends a control command to the pump controller 20 via the output signal converter 19, and (3) the pump controller 20 controls the pump 12 based on the control command.
(4) As shown in FIG. 11, a pressure change in the range B is induced, and the pressure value is returned to the discharge amount set value serving as the reference value. FIG.
FIG. 1 is a graph of a change in the discharge amount over time for explaining feedback control of the coating system according to the present embodiment.

As is apparent from the above description, the coating system of the present embodiment is such that a coating material using a highly volatile organic solvent used for manufacturing an electrode plate of a battery changes to a high viscosity even if it has a high viscosity. Even if the discharge amount decreases, it is possible to perform quantitative application. Further, as described above, since there is no unevenness on the inner surface of the pipe 1 to be measured of the pressure measuring device, not only there is no pressure loss due to pipe resistance, but also hardly any solidification of the paint due to stagnation or the like.

(Fifth Embodiment) In the fifth embodiment, it will be described that the above-described pressure measuring device in the present embodiment can also be used as a viscometer for detecting the viscosity of a flowing fluid.

More specifically, the strain gauge 5 in the above-described pressure measuring device according to the present embodiment is configured as shown in FIG.
As shown in (a) and (b), a constant output is given for the rating. Therefore, as shown in FIG. 12, which is a graph for explaining a calibration method from the rated voltage to the display value, the display value B for the output is changed to, for example, a pressure value of 1.0MPa.
In the case of “a”, the output of the strain gauge 5 is in a proportional relationship such that 1.5 mV is output for 1 V. By utilizing this relationship, the output voltage from the strain gauge 5 is 0 mV
/ V, the display on the display of the pressure gauge is 0 MPa, and when the output voltage is 0.75 mV / V, which is half, the display on the display is 0.5 MPa. When the output voltage is 1.5 mV / V, the display on the display is Calibrate the display so that the reading is 1.0 MPa.

Next, in order to determine the measuring line, the change in viscosity is proportional to the change in pressure at the time of liquid feeding, and it is assumed that liquid feeding is performed at a constant flow rate. Perform the same calibration as for the displayed value. That is, as shown in FIG. 13 which is a graph for explaining a method of calibrating the liquid sending pressure to the viscosity value, the calibration is performed from the liquid sending pressure to the viscosity value. In FIG. 13, the horizontal axis represents the pressure value of the fluid, and the vertical axis represents the viscosity value of the fluid.
In the case of, the displayed viscosity value is 500 mPa · sec,
At 1.0 MPa, the displayed viscosity value is 1000 mPa ·
sec.

In this way, the pressure measuring device can be used as an in-line viscometer.

(Embodiment 6) Next, the configuration and operation of a pressure measuring device according to this embodiment will be described with reference to FIG. FIG. 14 is a perspective view of the pressure measuring device according to the sixth embodiment.

The pressure measuring device of the present embodiment has an appearance and a configuration similar to those of the above-described pressure measuring device of the first embodiment. As shown in FIG. 14, a twist preventing groove 23 is provided. By providing such a torsion preventing groove, it is possible to prevent vibration or bending / torsion stress transmitted from the pipes connected before and after, and to appropriately detect the pressure value of the flowing fluid.

In FIG. 14, the outer surface of the pressure-sensitive block 2 is provided with a twist preventing groove 23 having a width of 5 mm and a depth of 3 mm.
Seven grooves having dimensions of mm are provided. However, the present invention is not limited to this, and the twist preventing groove may have (1) an arbitrary size, and (2) the shape thereof is not limited to a so-called groove shape. It may have a rib shape or the like. Further, in FIG. 14, two bending stress relaxation grooves 4 are provided on the outer surface of the pipe 1 to be measured at the front and rear, respectively. Needless to say, it is possible to reduce the influence of torsional / bending stress and vibration transmitted from the fluid and measure the fluid pressure more accurately.

[0064]

(Example 1) In Example 1, the pressure measuring device (FIG. 1 (a) to FIG.
(C)), and the flowing fluid is:
An organic solvent-based paint in which a positive electrode or a negative electrode active material used for forming an electrode plate of a battery was mixed and dispersed was used.

As described above, when the battery active material paint is passed through the pipe 1 to be measured, the inside diameter of the pipe 1 to be measured is the same as the inside diameter and the shape of the pipe (not shown) connected front and rear. The fluid resistance during the passage is eliminated. Further, since there is no uneven shape in the pressure measurement portion, even when the viscosity is high as in the case of a battery active material paint, no liquid flow resistance is generated.

In the first embodiment, the thickness of the thin portion 3 (FIG. 1)
(See (c)) is 0.5 mm. Although it is possible to make it thinner than this, it was set to 0.5 mm so as not to be damaged by repeated use. This portion functions as a diaphragm or the like provided on the detection tip surface of the pressure detector.

As described above, since the thin portion 3 is formed in a part of the pipe path, the thin portion 3 generates a distortion due to the fluid expansion effect at the time of liquid passage, and the strain gauge 5 detects the distortion. The strain value detected by the strain gauge 5 provided in the thin portion 3 was converted into a pressure value, which could be used as a pressure gauge.

By adopting the above-described pressure measuring device, since the inner diameter of the piping connected before and after is the same, almost no fluid resistance and turbulent flow can be achieved.

In the process of coating and manufacturing the battery electrode plate, the battery active material paint which was fed into the pipe by a pump or the like was very likely to adhere to the inner surface of the pipe. Further, the concentration of the paint adhered to the inner surface was somewhat high in the solid content, and a film was sometimes formed on the inner surface of the pipe with the passage of time. For this reason, in the conventional configuration (see FIGS. 15 and 16), stagnation is easily generated in the measuring conduit, and the battery active material and the like are retained, and the pressure is eventually blocked so that the pressure cannot be detected. . With the configuration of the first embodiment, the fluid of the battery active material paint having high viscosity is formed as a film on the inner surface of the pipe, but there is no place where stagnation and stagnation occur, and even if a film is formed. However, since the expansion action of the fluid was generated, the pressure could be detected without any problem even after a lapse of time.

In the maintenance of the piping, since there is no protrusion on the inner surface and the diameter of the piping is the same as before and after, it can be easily cleaned with a brush or the like even when the piping is connected or disassembled. This greatly improved workability during maintenance.

(Embodiment 2) In this embodiment 2, the above-described pressure measuring device (see FIG. 7) of the embodiment 2 is used, and the fluororesin 9 is coated on the entire surface of the pipe through which the liquid flows. It is coated with a thickness of about 50 μm.

As described above, the formation of the thin portion 3 to which the strain gauge 5 is attached is performed by forming a film of the fluororesin 9 on the inner surface of the pipe at a high temperature of several 100 ° C. due to a sudden stress change such as thermal expansion. However, since there is a problem that the thin portion 3 is deformed or cracked, it is performed in a subsequent step. That is, after the liquid-passing pipe is penetrated, the fluorine-based resin 9 is formed on the inner surface of the pipe, and then the thin portion 3 is formed. Although the detection sensitivity of the strain gauge 5 provided in the thin portion 3 is several percent lower than the configuration of the first embodiment, the sensitivity can be calibrated to perform pressure detection comparable to that of the first embodiment.

With the configuration of the pressure measuring device described above, the pressure value can be detected immediately after the passage of liquid compared with the conventional pressure detector, and the structure is not branched in the liquid passage pipe. There is no piping resistance and no liquid retention or stagnation.

Further, when a different kind of liquid or paint is passed, the residual liquid, which is a component of the paint that has passed last time, can be prevented from adhering to the inner surface. Of course, some residual liquid may be left on the inner surface of the pipe in the form of drops, but if you push out with the intention of discarding a few percent of the newly flowing paint, you can replace it with new paint components in a short time Can be completed. In addition,
When there was no fluorocarbon resin 9 film, as described above, a new paint was allowed to pass through, and the paint components could not be replaced in a short time by extrusion, which required a large amount of new paint and work time. . Therefore, in this embodiment, the work time and the loss of the paint, that is, the material, can be significantly reduced.

Further, when the fluorine resin 9 film is not provided as in the conventional case, not only the corrosion resistance is poor, but also metal ions (Fe and the like) are slightly precipitated from the inner metal surface, which may contaminate the fluid in the pipe. There was also. By coating the inner surface of the pipe 1 to be measured with the fluorine-based resin 9 as in Example 2, it was possible to improve both the corrosion resistance and prevent the contamination of the fluid by metal ions.

(Embodiment 3) In this embodiment 3, the above-mentioned pressure measuring device (see FIG. 8) of the embodiment 3 is used, and the same position as the strain gauge 5 provided on the thin portion 3 or The temperature detecting element 10 was fixed at an adjacent position.

As described above, by installing the temperature detecting element 10 in the thin portion 3, it was possible to accurately and constantly detect and display the temperature of the fluid flowing therethrough. In addition, there is a configuration in which a rod-shaped temperature detection unit is protruded into the pipe, for example. In this case, however, turbulence such as Karman vortex and flow resistance are likely to occur in the fluid when the liquid flows. The stress due to this turbulence and flow resistance is accumulated in the temperature detection unit,
In some cases, the temperature detector was damaged, causing problems such as contamination of the piping or loss of the inner surface. In order to solve such a problem, in the third embodiment, the temperature detecting element 10 is provided in the thin portion 3 adjacent to or adjacent to the strain gauge 5 at the same position, and the pressure value and the fluid pressure of the fluid passing therethrough are provided. Temperature can be detected and displayed at the same time and managed.

With the configuration of the pressure measuring device described above, not only can the pressure value be detected immediately after the flow of liquid compared with the conventional pressure detector, but also the turbulent flow Tubing resistance and liquid stagnation / stagnation can be eliminated.

Further, since the element 10 for detecting the temperature is provided at the same position as the strain gauge 5 for detecting the pressure, the same pressure and temperature can be detected and displayed. And temperature can be managed in a time-series manner. Therefore, when constant temperature control is required, such as when heating a paint or a fluid, it can be used as a very effective measuring instrument. By adopting a configuration in which the on-site temperature and the fluid pressure at that time can be managed collectively, the piping route can be shortened, and the piping resistance can be further reduced.

(Embodiment 4) In Embodiment 4, the application system (see FIG. 9) in Embodiment 4 described above is used, and it is used for forming a battery electrode plate or a color filter and for electronic components. A coating process for manufacturing a ceramic sheet or the like will be described.

The pump 12 used was a mono pump. Although the supply tank 11 has an open-to-atmosphere shape, it may be a sealed tank or may be configured to supply paint continuously or intermittently from the outside. In the fourth embodiment, a sequential supply tank that is open to the atmosphere is used.

As described above, the paint in the supply tank 11 is discharged by the pump 12 through the pipe 13 from the discharge slit 16 of the coating nozzle 15 provided at the tip of the pipe in a uniform curtain shape in the width direction. The pressure measuring device described above was provided immediately before the application nozzle 15.

Hereinafter, the case where the paint is an active material paint used for a battery will be described more specifically.

The battery active material paint depends on the polarity of the electrode plate.
The materials and viscosities are different. In other words, it is common to use water or an organic solvent as the solvent for coating,
Particularly, in the case of a paint using an organic solvent as a solvent, the solid content concentration in the paint may increase due to the volatilizing action depending on the solvent composition. For this reason, the actual viscosity value may be higher than the viscosity value at the time when the coating material is formed.

As described above, due to the increase in the viscosity of the paint, the discharge amount of the pump 12 decreases with respect to the discharge amount set value in time series as shown in FIG.
Eventually, the discharge amount reaches the point A, which is the lower limit region of the discharge amount, and the desired discharge amount cannot be obtained. Therefore, the discharge amount and the coating film thickness tend to decrease from the desired numerical values, and the film thickness distribution in the long direction is inclined Resulting in. For this reason, it can be said that the production yield may be significantly reduced.

Therefore, as shown in FIG. 9, the operator sets the discharge amount rotation speed of the pump 12 from the set value input 17 and outputs the pump signal from the output signal converter 19 via the controller (CPU) 18. The control device 20 causes the pump 12 to operate at a discharge speed corresponding to the set value. The discharged paint passes through the pipe 13 and is discharged uniformly from the discharge slit 16 of the application nozzle 15 in a curtain shape in the width direction.

The pressure of the paint being fed is displayed on a pressure indicator 21 by a pressure measuring device 14 provided immediately before the application nozzle 15, and this pressure value is used as the input signal A / D converter 2.
2 is fed back to the controller (CPU) 18.

The set value of the discharge rotation speed input from the set value input 17 and the measured pressure value from the pressure indicator 21 are stored in the controller (CPU) 18 after being matched. In this way, the matched measured pressure value and the set value of the number of rotations of the discharge are the reference values.

When the viscosity of the paint in the supply tank 11 increases due to factors such as evaporation of the solvent, the discharge amount of the paint sent from the pump 12 tends to gradually decrease as shown in FIG.

When a decrease in the discharge amount occurs, the pressure measuring device 14 (see FIG. 9) recognizes the decrease in the discharge amount by detecting the pressure value, and feeds back the detected pressure value to the controller (CPU) 18. The controller (CPU) 18 matches the fed back pressure value with the stored reference value, and then sends a control command to the pump control device 20 so as to become the reference value. Then, the pump control device 20 controls the rotation speed of the discharge amount of the pump 12, and returns to the discharge amount serving as the reference value by the control in the B range (see FIG. 11).

By the coating system having the above-described pressure measuring device and feedback control structure, a paint using a highly volatile organic solvent as a solvent, which is used in a manufacturing process of a specific battery electrode plate or for forming a dielectric layer and a ceramic sheet, is used. Even so, application stability can be maintained. This is because the optimum control of the pump 12 is performed in a timely manner even if the viscosity of the paint is significantly generated due to the surrounding environment or the influence of the separation of the solid matter from the solvent and the discharge amount is reduced.

The pressure measuring device 1 used in the fourth embodiment
4 has the same configuration as that of the first embodiment, and therefore has no irregularities on the inner surface of the pipe 1 to be measured. Therefore, not only pressure loss due to pipe resistance does not occur, but also paint stagnation and stagnation do not occur. Therefore, the pressure can be detected with high sensitivity, and the pump 1
2 could be controlled appropriately.

Example 5 In Example 5, as in Embodiment 5 described above, a pressure measuring device is used as a viscometer. In addition, the strain gauge 5 is shown in FIG.
As shown in (b), a constant output is given for the rating.

As shown in FIG. 12, when the display value B with respect to the output is, for example, a pressure value of 1.0 MPa, the output of the strain gauge 5 has a proportional relationship of outputting 1.5 mV for 1 V. . Utilizing this relationship, when the output voltage from the strain gauge 5 is 0 mV / V, the display on the display of the pressure gauge is 0 MPa, and when the output voltage is half, 0.75 mV / V, the display on the display is 0.5 MPa, 1.5 mV / V
At this time, the display is calibrated so that the display on the display is set to 1.0 MPa.

Next, re-calibration is performed so as to display the viscosity value by applying this calibration method.

More specifically, for example, the flow rate is fixed at 10 l / min, and (1) the viscosity is 1000 mP.
a · sec calibration liquid is fed, and the pressure display value at this time is adjusted to 1000 mPa, and (2) the viscosity is 500 mPa · s.
ec calibration fluid is sent, and the indicated pressure value at this time is 500
Adjust to mPa. In addition, when the flow rate is changed, it is necessary to adjust the pressure display value by sending such a calibration solution each time and accumulate data (in short, the viscosity is determined by the solid content in the solution and the resin content). Because it is determined by the ratio,
Since the difference in viscosity means the difference in volume density, it is a great premise that calibration is performed under the condition of constant flow rate).

Thereafter, as in the case of calibrating the strain gauge 5 shown in FIG. 12, as shown in FIG. 13, the horizontal axis represents the pressure value of the fluid, and the vertical axis represents the viscosity of the fluid. 5
At the time of MPa, the displayed viscosity value is 500 mPa · sec.
When the pressure is 1.0 MPa, the displayed viscosity value is 100
Calibration is performed so as to be 0 mPa · sec. By such calibration, the viscosity and pressure of the fluid flowing through the pipe are measured.

The change in viscosity is proportional to the change in pressure at the time of liquid sending, and when the fluid is sent at a constant flow rate, the fluid viscosity can be measured in this manner. In this case, the relationship between the viscosity and the pressure of the fluid to be sent is examined in more detail, accumulated, and compiled into a database, whereby a wide range of fluid viscosity can be managed.

(Embodiment 6) In Embodiment 6, the pressure measuring device (see FIG. 14) in Embodiment 6 described above is used. A total of seven torsion preventing grooves 23 are formed in parallel with.
For this reason, it becomes difficult for the strain gauge 5 to detect a torsion that acts in a circumferential direction outside the pipe from a pipe (not shown) connected before and after.

The material for forming the pressure measuring device of the sixth embodiment is a general SUS304.
Alternatively, 303 or 316L may be used.

A bending stress relaxation groove 4 is provided on the external appearance of the pipe 1 to be measured. The bending stress relieving groove 4 is provided to absorb a bending stress added from a vibration transmitted from a pipe connected before and after (not shown) or a pipe's own weight due to connection. Of course, the groove depth, width, number of grooves formed, and the like are not particularly limited.

In a small-scale plant or a small-scale production site at a research / development level, there is a situation in which a worker hardly installs a column having an adjuster function for balancing each pipe. That is, since it is determined that the distance and the amount of routing of the pipe connection are small, there is often no support for the adjuster function. Even in such a case, the external configuration of the pressure measuring device described above enables the bending stress generated from the vibration due to the pump or liquid sending means transmitted from the piping connected before and after, or the accumulated weight due to the piping connection, Concentration of torsional stress due to unevenness can be prevented.

As described above, by adopting the external shape of the present embodiment, the strain gauge 5 for detecting pressure can accurately and appropriately detect the pressure value of the fluid flowing therethrough.

As described above, according to the present invention, for example, at least one wall thickness is directed radially inward from the outer surface of the tubular pipe having a circular cross section, and the inner surface of the liquid is left thin.
A strain gauge is attached to the thin portion to serve as a pressure receiving portion, and a fluid expansion amount caused when a liquid fluid flows through the tubular pipe is added to the thin portion by the strain gauge attached to the thin portion. A pressure measuring device that detects stress strain, converts the strain change amount into a pressure numerical value, and measures the pressure of the fluid.

Further, according to the present invention, for example, in the above-described pressure measuring device, the pressure receiving portion provided at a predetermined portion of the radially inner surface through which the liquid fluid flows has no step, and the pressure measuring device includes the pressure receiving portion. The inner surface in the radial direction,
And a thin film coating with at least one or more fluorine-based resin such as ethylene tetrafluoride-ethylene copolymer resin, and capable of measuring without accumulation of liquid and air.

The present invention also relates to, for example, the above-described pressure measuring device, which is provided adjacent to or adjacent to a strain gauge attached to a portion in which at least one wall thickness is reduced from a pipe outer surface to a radially inner side. A pressure measuring device, wherein a temperature detecting element is mounted to measure a liquid temperature simultaneously with an amount of fluid expansion when a liquid fluid flows.

Further, according to the present invention, for example, in the above-described pressure measuring device, a configuration is such that a fixed amount of fluid is caused to flow through a pipe route by a fluid sending device, and a fluid pressure change amount during fluid passing is sent. A pressure measuring device having a function of detecting a change in a liquid amount, feeding back the change amount to a liquid supply unit, and performing a correction control to a predetermined liquid passing pressure.

Further, according to the present invention, for example, in the above-described pressure measuring device, the liquid fluid flows in a fixed amount through the piping path, and the expansion amount at the time of the liquid flowing due to the viscosity change of the liquid fluid is detected. The pressure measuring device is characterized in that the measured value of the expansion amount is converted into the viscosity value of the fluid, and the fluid pressure and the viscosity are simultaneously measured.

Further, according to the present invention, for example, in the above-mentioned pressure measuring device,
At least one wall thickness is directed radially inward, the inner surface of the liquid flow is left thin in a concave shape, and a strain gauge is attached to the thin portion. At least one recessed groove or protruding rib is provided in the same direction as the traveling direction to make it less susceptible to torsional / bending stress and vibration transmitted from the piping path, and the accuracy of fluid pressure measurement is improved. It is a pressure measuring device.

In the above-described embodiment, the bending stress relaxation grooves 4 are provided two by two. However, it is desirable to increase or decrease the number of the bending stress grooves depending on the installation conditions and to select an optimum number.

Further, in order to further improve the detection sensitivity of a later-described strain gauge 5 attached to the thin portion 3, as shown in FIGS. 2A and 2B, for example, as shown in FIGS. A key groove (which is a groove formed by a convex portion viewed from the inner side of the liquid passage in FIG. 2B) is provided on the surface corresponding to the detection to increase the detection area, and FIG. 3A and FIG. As shown in the figure, special processing may be performed, such as making the surface equivalent to the detection of the inner surface of the liquid flow as flat as the surface on which the strain gauge 5 is attached. FIG. 2A is a sectional view in the liquid flow direction of a pressure measuring device in which a key groove is provided on the surface corresponding to the detection of the inner surface of the liquid flowing direction, and FIG. It is sectional drawing. FIG. 3A is a cross-sectional view in the liquid flowing direction of a pressure measuring device in which a surface equivalent to the inner surface of the liquid flowing is processed into a flat surface equivalent to the surface to which the strain gauge 5 is attached, and FIG. It is a radial cross section of a measuring device.

Further, in the present embodiment described above, two strain gauges 5 are provided in the thin portion 3, but the sensitivity can be improved by using four or more strain gauges.

Further, in the above-described embodiment, the surface shape forming the thin portion 3 of the pressure-sensitive block 2 is circular. It does not do.

The coating process on the inner surface of the pipe is as follows:
The coating material is not limited to the fluorine-based resin 9 and may be any coating material that can suppress or prevent metal ions precipitated from the inner surface of the pipe and can cope with abrasion or corrosion due to contact with a flowing fluid. For example, DLC (diamond-like carbon) that can be a coating material that can respond to wear or corrosion
However, there is no problem. In recent years, at room temperature of 20 to 6
Since a technique capable of performing coating at about 0 ° C. has been established, a method of coating a DLC film on the inner surface of a pipe is also good.

Further, the calculation of the pressure according to the present invention is always performed in the above-described embodiment. However, the present invention is not limited to this, and the calculation of the pressure of the present invention may not be performed. In short, the pressure and / or viscosity of the fluid of the present invention may be calculated based on the result of detecting the amount of deformation of the predetermined portion of the present invention.

Further, the fluid under pressure according to the present invention is a liquid in the above-described embodiment. However, the present invention is not limited to this, and the fluid of the present invention may be a gas.

As is clear from the above description, the present invention is characterized in that when a fluid is fed into a pipe, there is no unevenness on the entire inner surface and the inner diameter of the pipe to be measured is the same as the inner diameter of the front and rear liquid sending pipes. Therefore, the pressure of the fluid can be constantly measured without causing pressure loss. In addition, since there is no need to provide a branched conduit for measuring the pressure of the fluid in a part of the piping route, it is possible to eliminate the stagnation and stagnation of the fluid as a result, and to make it the same as the inner diameter of the liquid supply piping. The resistance to the fluid from the fluid can be completely eliminated. Since there is no stagnation or stagnation, it is possible to prevent foreign matter or solid matter from being mixed in the paint or fluid, and it is possible to eliminate factors causing rot and bacteria even when the liquid supply is stopped. In the cleaning of the inside of the pipe, the part corresponding to the pressure detection is also the same straight pipe as the inner diameter of the liquid sending pipe, so that the running water can be easily washed while the pipe is connected, greatly improving workability. be able to.

[0118]

As is apparent from the above description,
The present invention has an advantage in that the pressure of a fluid can be measured, for example, without inducing the stagnation of the fluid sent in the pipe.

[Brief description of the drawings]

FIG. 1 is a plan view (FIG. 1A) and a cross-sectional view taken along the line AA ′ (FIG. 1) of a pressure measuring device according to a first embodiment of the present invention.
(B)), and a schematic diagram including a cross-sectional view taken along the line BB ′ and an enlarged view in the vicinity of the thin portion 3 (FIG. 1C).

FIG. 2 is a cross-sectional view (FIG. 2 (a)) and a radial cross-sectional view (FIG. 2 (a)) of a pressure measuring device according to the present invention in which a key groove is provided on a surface corresponding to the detection of the inner surface of liquid flow 2 (b))

FIG. 3 is a sectional view (FIG. 3 (a)) and a diameter of a pressure measuring device according to the present invention in which a surface equivalent to the inner surface of the liquid passage is processed into a flat surface equivalent to the surface to which the strain gauge 5 is attached. Directional sectional view (FIG. 3 (b))

FIG. 4 shows strain gauge 5 according to the first embodiment of the present invention.
Is a schematic diagram (FIG. 4 (a)) of a pressure measuring device provided with a flat view and an enlarged view of the vicinity of the thin portion 3;
B ′ sectional view (FIG. 4B)

FIG. 5 shows a strain gauge 5 according to the first embodiment of the present invention.
Sectional view in radial direction for explaining the mounting configuration

FIG. 6 shows strain gauge 5 according to the first embodiment of the present invention.
(FIG. 6 (a)) and a graph (FIG. 6 (b)) for explaining the voltage measurement result of the electric signal taken out by FIG.

FIG. 7 is a sectional view of a pressure measuring device according to a second embodiment of the present invention in a liquid flowing direction.

FIG. 8 is a sectional view of a pressure measuring device in a liquid flowing direction according to a third embodiment of the present invention.

FIG. 9 is a configuration diagram of a coating system according to a fourth embodiment of the present invention.

FIG. 10 is a graph showing a change in discharge amount over time for explaining a discharge amount lower limit value.

FIG. 11 is a graph showing a change in discharge amount over time for explaining feedback control of a coating system according to Embodiment 4 of the present invention.

FIG. 12 is a graph for explaining a method of calibrating from a rated voltage to a display value when a pressure measuring device is used as a viscometer in Embodiment 5 of the present invention.

FIG. 13 is a graph for explaining a method of calibrating a liquid sending pressure to a viscosity value when a pressure measuring device is used as a viscometer according to a fifth embodiment of the present invention.

FIG. 14 is a perspective view of a pressure measuring device according to a sixth embodiment of the present invention.

FIG. 15 is a schematic diagram for explaining a conventional sanitary piping connection type pressure measuring device.

FIG. 16 is a schematic diagram for explaining a conventional general screw-in type pressure measuring device.

[Explanation of symbols]

 Reference Signs List 1 pipe to be measured 2 pressure-sensitive block 3 thin part 4 bending stress relaxation groove 5 strain gauge 6 cable connection part 7 filler 8 cable 9 fluororesin 10 temperature detecting element 11 supply tank 12 pump 13 piping 14 pressure measuring device 15 coating Nozzle 16 Discharge slit 23 Twist prevention groove a Pipe b Measurement pipe c Measurement pipe d Measurement fluid e Thickness f Pressure detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsuharu Wakabayashi 3-9 Susukino-cho, Sagamihara-shi, Kanagawa Prefecture Inside Tandti Co., Ltd. (72) Satoru Onuki 3-9 Susukino-cho, Sagamihara-shi, Kanagawa Prefecture Tandti Co., Ltd. F term (reference) 2F055 AA39 BB20 CC14 DD20 EE11 FF38 FF49 HH05 HH11 2F056 CA08

Claims (7)

[Claims] 1. A tubular member in which a fluid flows inward and a predetermined portion has a smaller thickness than other portions, and a tubular member on a side different from a side of the predetermined portion where the fluid flows. A measuring device provided with a detecting unit provided for detecting an amount of deformation of the predetermined portion. 2. The measuring device according to claim 1, wherein a result of the detection by the detection unit is used to calculate a pressure and / or a viscosity of the fluid. 3. The measuring apparatus according to claim 1, wherein the whole or a part of the inside of the tubular member is thin-film coated with a predetermined thin film. 4. The measuring device according to claim 1, further comprising a temperature detecting unit provided on a side of the predetermined portion different from a side on which the fluid flows, for detecting a temperature of the predetermined fluid. . 5. The measuring device according to claim 1, wherein a torsion preventing groove for suppressing deformation of the tubular member due to torsion accompanying the flow of the fluid is provided outside the tubular member. 6. A tubular member in which a fluid flows inward, wherein a predetermined portion has a smaller thickness than other portions, and
A measuring device provided on a side of the predetermined portion different from the side on which the fluid flows, and a detection unit for detecting an amount of deformation of the predetermined portion; and for supplying the fluid to the tubular member. Measurement system provided with a fluid supply device. 7. The measurement system according to claim 6, further comprising control means for controlling the supply based on a result of the detection.