WO2003078934A1 - Procede de mesure de debit et debitmetre, ensemble section de mesure de debit utilise pour ceux-ci et unite de mesure de debit les utilisant, et dispositif d'inspection de fuite de canalisations utilisant un debitmetre - Google Patents
Procede de mesure de debit et debitmetre, ensemble section de mesure de debit utilise pour ceux-ci et unite de mesure de debit les utilisant, et dispositif d'inspection de fuite de canalisations utilisant un debitmetre Download PDFInfo
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- WO2003078934A1 WO2003078934A1 PCT/JP2003/003251 JP0303251W WO03078934A1 WO 2003078934 A1 WO2003078934 A1 WO 2003078934A1 JP 0303251 W JP0303251 W JP 0303251W WO 03078934 A1 WO03078934 A1 WO 03078934A1
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- Prior art keywords
- flow rate
- flow
- value
- corresponding output
- temperature sensing
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6847—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow where sensing or heating elements are not disturbing the fluid flow, e.g. elements mounted outside the flow duct
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
- G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
- G01F1/692—Thin-film arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
- G01F1/699—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters by control of a separate heating or cooling element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F7/00—Volume-flow measuring devices with two or more measuring ranges; Compound meters
Definitions
- the present invention relates to a fluid flow sensing technology, and more particularly to a method for measuring a flow rate of a fluid flowing through a flow passage and a flow meter used for the method.
- the present invention particularly relates to a flow rate measuring unit package for measuring a flow rate of a fluid flowing through a flow passage and a flow rate measuring unit using the same.
- the present invention relates to an apparatus for inspecting leakage of liquid from piping using a flow meter.
- the leak inspection apparatus of the present invention is suitably used, for example, for inspecting liquid leakage in a fuel oil tank such as a petroleum tank buried underground or a pipe for drawing liquid from a tank of various liquid chemicals. Background art
- flow rate sensors for measuring the flow rate (or flow rate) of various fluids, especially liquids, have been used, but because they are easy to reduce the cost. So-called thermal (especially indirectly heated) flow sensors are used.
- This indirectly heated flow sensor uses a sensor chip, which is formed by laminating a thin-film heating element and a thin-film temperature sensing element on a substrate via an insulating layer by using thin-film technology, with the fluid in the piping as a fluid flow passage. What is arrange
- positioned so that heat transfer is possible between is used.
- the temperature sensor is heated to change the electrical characteristics of the temperature sensor, such as the value of the electric resistance. This change in the electric resistance value (based on the temperature rise of the temperature sensing element) changes according to the flow rate (flow velocity) of the fluid flowing in the pipe.
- thermosensor This is because a part of the calorific value of the heating element is transmitted into the fluid, and the amount of heat diffused into the fluid changes according to the flow rate (velocity) of the fluid. This is because the amount of heat supplied changes, and the electrical resistance value of the thermosensor changes.
- the change in the electrical resistance of this thermosensor It also depends on the temperature of the body.Therefore, a temperature sensing element for temperature sensing should be incorporated in the electric circuit that measures the change in the electric resistance of the thermosensitive body, and the change in the measured flow rate due to the temperature of the fluid It is also done to reduce as much as possible.
- Such an indirectly heated flow sensor using a thin-film element is described in, for example, Japanese Patent Application Laid-Open No. H11-118566.
- an electric circuit including a bridge circuit is used to obtain an electric output corresponding to the flow rate of the fluid.
- thermosensitive body As a flow sensor, a fluid is heated by a heat source placed at a specific position in the pipe, and a thermosensitive body is placed at an appropriate distance upstream and downstream of the heat source position with respect to fluid flow in the pipe, There is a two-point temperature difference detection type that measures the fluid flow rate based on the detected temperature difference between the upstream temperature sensor and the downstream temperature sensor that occurs when the fluid inside flows.
- this sensor is used for the above oil leak detection, the change in the output of the electric circuit with respect to the change in the flow rate becomes small when the flow rate value becomes, for example, 3 milliliters or more.
- the error increases in the region (that is, the ratio of the flow rate difference that can be distinguished during measurement increases, and the sensitivity decreases).
- Conventionally used methods for such pipe inspection include a method in which a gas such as air or a liquid such as water is pressurized and injected into the pipe while the pipe is sealed, and the pressure is reduced after a predetermined time has elapsed. There is one that detects the presence or absence of On the other hand, in some cases, the pressure in the tank is reduced while the pipe is sealed, and the presence or absence of an increase in pressure after a predetermined time has elapsed is detected.
- a gas such as air or a liquid such as water
- the pressure in the tank is reduced while the pipe is sealed, and the presence or absence of an increase in pressure after a predetermined time has elapsed is detected.
- the present invention provides a flow measurement method and a flow meter capable of performing flow measurement with good accuracy and sensitivity over a wide flow range from a very small flow region to a relatively large flow region. It is the purpose.
- a method for measuring a flow rate of a fluid in a fluid flow passage wherein a flow rate of the fluid is measured by an indirectly controlled temperature control type flow rate measurement in a high flow rate area larger than a predetermined boundary flow rate area with respect to the flow rate value.
- the flow rate value obtained as a measured value is taken as the measured value, and the low flow rate area smaller than the boundary flow rate area is obtained by two fixed point temperature difference detection type flow measurement.
- the flow rate value obtained by the indirect heat constant temperature control type flow rate measurement or the flow rate value obtained by the two-point temperature difference detection type flow rate measurement is not used for the boundary flow rate region.
- D a flow measuring method, wherein the measuring unit for the indirectly heated constant temperature control type flow rate measurement is used as a heat source for heating the fluid in the fluid flow path in the fixed point temperature difference detection type flow rate measurement;
- the boundary flow rate region includes only one specific flow rate value.
- the flow rate of the fluid is measured by the indirect heat constant temperature control type flow rate measurement, and when the obtained flow rate value belongs to the high flow rate area, or the high flow rate area and the boundary flow rate area. If it belongs to any of the above, the flow rate value is not a measured value. Otherwise, the flow rate of the fluid is measured by the two-point temperature difference detection type flow measurement, and the obtained flow rate value is used as the measured value.
- the flow rate of the fluid is first measured by the two-point temperature difference detection type flow measurement, and when the obtained flow rate value belongs to the low flow rate area or when the low flow rate area and When the flow rate belongs to any of the boundary flow rate areas, the flow rate value is regarded as a measured value, otherwise, the flow rate of the fluid is measured by the indirect heating constant temperature control type flow rate measurement, and the obtained flow rate value is measured. Value.
- the indirectly heated constant-temperature control type flow rate measurement unit has a heating element and a first temperature sensing element disposed adjacent to the heating element, and the heating element is based on the detected temperature of the first temperature sensing element. Receiving the feedback control, obtaining the first flow rate corresponding output based on the state of the feedback control;
- the two-point temperature difference detection type flow rate measuring unit is related to a fluid flow direction in the fluid flow passage.
- a second temperature sensing element and a third temperature sensing element arranged respectively on the upstream side and the downstream side of the indirect heat constant temperature control type flow rate measurement unit, and the detection temperature of the second temperature sensing element And the second flow rate corresponding output is obtained based on the difference between the flow rate and the detected temperature of the third thermosensitive element.
- a flow rate meter which outputs a flow rate value obtained based on the first flow rate corresponding output or a flow rate value obtained based on the second flow rate corresponding output as the measured value for the boundary flow rate region,
- the boundary flow rate region includes only one specific flow rate value.
- the arithmetic unit performs the first The flow rate value obtained based on the output corresponding to the flow rate is defined as a measured value, and at other times, the flow rate value obtained based on the output corresponding to the second flow rate is defined as the measured value.
- the calculation unit may firstly correspond to a time when the second flow rate corresponding output corresponds to the low flow rate area or to any of the low flow rate halo area and the boundary flow rate area. At times, the flow rate value obtained based on the second flow rate corresponding output is a measured value, and at other times, the flow rate value obtained based on the first flow rate corresponding output is a measured value.
- each of the heating element and the first temperature sensing element is in the form of a conductive thin film, and is laminated via an electrically insulating thin film.
- the first flow rate corresponding output is obtained from a detection circuit including the heating element, the first temperature sensing element, and a temperature sensing element for temperature compensation.
- the present invention provides a flow rate measurement unit package used for flow rate measurement and a flow rate measurement unit package capable of performing flow rate measurement with good accuracy and sensitivity over a wide flow rate range from a very small flow rate range to a relatively large flow rate range.
- a flow measurement unit using P It is intended to provide brutality.
- a flow measurement unit package for measuring a flow rate of a fluid in a fluid flow passage comprising: an indirectly heated constant temperature control type flow measurement unit and a two-point temperature difference detection type flow measurement unit attached to the fluid flow passage.
- the two fixed-point temperature difference detection type flow measuring units are upstream temperature sensing units and downstream units respectively disposed on the upstream side and the downstream side of the indirectly heated constant temperature control type flow measuring unit with respect to the fluid flow direction in the fluid flow passage. It consists of a side temperature sensor,
- the indirectly heated constant-temperature control type flow rate measuring unit has a heating element and a first temperature sensing element disposed adjacent to the heating element, and the upstream temperature sensing section has a second temperature sensing element.
- the downstream temperature sensing part has a third temperature sensing element,
- a first wiring section for electrical connection with the heating element and the first temperature sensing element is connected to the indirect heat constant temperature control type flow rate measurement section, and the upstream side temperature sensing section is connected to the first wiring section.
- a second wiring portion for electrical connection with a second temperature sensing element is connected, and a third temperature sensing portion for electrical connection with the third temperature sensing element is connected to the downstream temperature sensing portion.
- each of the first wiring portion, the second wiring portion, and the third wiring portion is formed using a flexible wiring board.
- the indirectly heated constant temperature control type flow rate measuring unit, the upstream temperature sensing unit, the downstream temperature sensing unit, and the part of the fluid flow passage to which these are attached are in a casing. Is housed in In one embodiment of the present invention, a first terminal, a second terminal, and a third terminal constituting the first wiring portion, the second wiring portion, and the third wiring portion project from the casing. Has been established.
- a temperature sensing portion having a temperature compensation temperature sensing element is accommodated in the casing, and a heat transfer member extending outside the casing is connected to the temperature sensing portion.
- the casing is provided with a fourth terminal that constitutes a fourth wiring portion for electrical connection with the temperature compensation thermosensitive body.
- the heating element and the first temperature sensing element each have a thin film shape that can be energized. It is laminated via an electrically insulating thin film.
- a flow measuring unit comprising: the flow measuring unit package as described above; a unit board for mounting the flow measuring unit package; and a flow measuring circuit element mounted on the unit board.
- the flow measurement circuit element includes an analog circuit element, and the analog circuit element controls the heating element based on a detected temperature of the first temperature sensing element, A first output corresponding to the flow rate is obtained based on the state of the feedback control, and a second output corresponding to the flow rate is obtained based on a difference between the detected temperature of the second thermosensor and the detected temperature of the third thermosensor.
- the flow measurement circuit element further includes a digital circuit element, and the digital circuit element obtains a flow measurement value based on the first flow corresponding output and the second flow corresponding output.
- the calculation unit outputs a flow value obtained based on the first flow corresponding output as a measured value for a high flow area larger than a predetermined boundary flow area with respect to the value of the flow rate. For a low flow rate area smaller than the boundary flow rate area, a flow rate value obtained based on the second flow rate corresponding output is output as a measured value, and for the boundary flow rate area, a flow rate value based on the first flow rate corresponding output is output. The obtained flow rate value or the flow rate value obtained based on the second flow rate corresponding output is output as a measured value.
- the boundary flow rate region includes only one specific flow rate value.
- the arithmetic unit performs the first The flow rate value obtained based on the flow rate corresponding output of the above is not a measured value, otherwise, the flow rate value obtained based on the second flow rate corresponding output is not a measured value, or first, the second flow rate corresponding output
- the flow rate value obtained based on the second flow rate corresponding output is not a measured value, otherwise, The said ⁇ 51
- the flow value obtained based on the output corresponding to flow rate 1 is used as the measured value.
- An internal pipe system having a connection end for communicating with the pipe to be measured and having a liquid discharge end, a tank for a temporarily stored pressurized liquid connected to the internal pipe system, A pump and a flow meter sequentially arranged in a path from the temporarily stored pressurized liquid tank to the connection end,
- the internal piping system is configured to transfer a liquid from the pipe to be measured to the temporarily stored pressurized liquid reservoir through the connection end and without passing through the flow meter by the pump.
- the flowmeter measures the liquid pressure in the portion of the second path from the pump to the connection end when the liquid pressure is increased by liquid pumping by the pump.
- a pipe leakage inspection device which inspects liquid leakage from the pipe to be measured based on the detected liquid flow rate;
- the internal piping system may further include the pump and the flow rate when a fluid pressure in a portion from the pump to the connection end in the second path exceeds a set value.
- a fourth path for returning the liquid from the portion between the pressure meter and the temporary storage pressurized liquid tank can be formed.
- the internal piping system may further include a fifth path that releases at least a part of the hydraulic pressure in the second path from the flow meter to the connection end. Can be formed. Further, in one embodiment of the present invention,
- the flowmeter is an indirectly controlled constant temperature control type flow measurement unit and a two-point temperature difference detection type flow measurement unit disposed facing the fluid flow passage forming the internal piping system, and the indirectly heated constant temperature control type flow measurement unit. And a calculation unit that obtains a measured value based on a second flow rate corresponding output obtained by using the first flow rate corresponding output obtained by using the second fixed point temperature difference detection type flow rate measuring unit.
- the indirectly heated constant-temperature control type flow rate measurement unit has a heating element and a first temperature sensing element disposed adjacent to the heating element, and the heating element is based on a detected temperature of the first temperature sensing element. Receiving the feedback control, obtaining the first flow rate corresponding output based on the state of the feedback control;
- the two-fixed-point temperature difference detection type flow measurement unit is configured to include a second temperature sensing element and a second temperature sensing element disposed on the upstream and downstream sides of the indirectly heated constant temperature control type flow measurement unit with respect to the fluid flow direction in the fluid flow passage.
- the second flow rate corresponding output is obtained based on the difference between the detected temperature of the second thermosensitive body and the detected temperature of the third thermosensitive body.
- the section outputs a flow rate value obtained based on the first flow rate corresponding output as a measured value for a high flow rate area larger than a predetermined boundary flow rate area with respect to the flow rate value, and a low flow rate smaller than the boundary flow rate area.
- the flow rate value obtained based on the second flow rate corresponding output is output as a measurement value
- the flow rate value obtained based on the first flow rate corresponding output or the second flow rate corresponding value is obtained. Obtained based on output And it outputs the amount value as a measured value.
- the boundary flow rate region includes only one specific flow rate value.
- the arithmetic unit performs the first The flow rate value obtained based on the output corresponding to the flow rate is defined as a measured value, and at other times, the flow rate value obtained based on the output corresponding to the second flow rate is defined as the measured value.
- the second flow rate corresponding output corresponds to the low flow rate area or corresponds to any of the low flow rate area and the boundary flow rate area
- Flow rate obtained based on the second flow rate corresponding output The value is taken as the measured value, otherwise, the flow value obtained based on the first output corresponding to the flow is taken as the measured value.
- each of the heating element and the first temperature sensing element is in the form of a conductive thin film, and is laminated via an electrically insulating thin film.
- the first flow rate corresponding output is obtained from a detection circuit including the heating element, the first temperature sensing element, and a temperature sensing element for temperature compensation.
- FIG. 1 is a schematic cross-sectional view for explaining one embodiment of a flow meter according to the present invention used for carrying out the flow measuring method according to the present invention.
- FIG. 2 is a partial perspective view showing the structure of the flow meter of FIG.
- FIG. 3 is a partial cross-sectional view of FIG.
- FIG. 4 is a partial cross-sectional view of FIG.
- FIG. 5 is a block diagram showing a flow measurement system of the flow meter of FIG.
- FIG. 6 is a diagram showing a circuit configuration for flow rate detection of the flow meter of FIG.
- FIG. 7 is a diagram showing an example of a calibration curve for conversion of Vh.
- FIG. 8 is a diagram showing an example of a calibration curve for conversion of Vout.
- FIG. 9 is a schematic diagram showing an embodiment of a flow rate measuring method and a liquid leak monitoring system using a flow meter according to the present invention.
- FIG. 10 is a partially omitted perspective view showing an embodiment of a flow rate measuring unit package according to the present invention.
- FIG. 11A is a plan view of the flow measuring unit package of FIG.
- FIG. 11B is a front view of the flow measurement unit package of FIG.
- FIG. 12A is a cross-sectional view of the flow measurement unit package of FIG.
- FIG. 12B is a vertical cross-sectional view of the flow measurement unit package of FIG.
- FIG. 13A is a plan view showing an embodiment of the flow rate measurement unit package according to the present invention.
- FIG. 13B is a front view showing an embodiment of a flow fi measurement unit package according to the present invention. You.
- FIG. 14A is a cross-sectional view of the flow measurement unit package shown in Figs. 13A and 13B.
- Fig. 14B is a vertical cross-sectional view of the flow measurement unit package shown in Figs. 13A and 13B.
- FIG. 15 is a perspective view showing an embodiment of a flow rate measuring unit according to the present invention.
- FIG. 16A is a plan view of the flow measurement unit of FIG.
- FIG. 16B is a front view of the flow measurement unit of FIG.
- FIG. 16C is a side view of the flow measurement unit of FIG.
- FIG. 17 is a perspective view showing an embodiment of the flow measurement unit according to the present invention.
- FIG. 18A is a plan view of the flow measurement unit of FIG.
- FIG. 18B is a front view of the flow measurement unit of FIG.
- FIG. 18C is a side view of the flow measurement unit of FIG.
- FIG. 19 is a perspective view showing an embodiment of the flow measurement unit according to the present invention.
- FIG. 2OA is a plan view of the flow measurement unit of FIG.
- FIG. 20B is a front view of the flow measurement unit of FIG.
- FIG. 20C is a side view of the flow measurement unit of FIG.
- FIG. 21 is a cross-sectional view showing an embodiment in which the flow measuring unit package according to the present invention is incorporated into a flow meter.
- FIG. 22 is a sectional view showing an embodiment in which the flow measurement unit according to the present invention is incorporated in a flow meter.
- FIG. 23 is a diagram showing an embodiment of the pipe leakage inspection device according to the present invention.
- FIG. 24 is a diagram for explaining the operation of the device of FIG.
- FIG. 25 is a diagram for explaining the operation of the device of FIG.
- FIG. 26 is a diagram for explaining the operation of the device of FIG.
- FIG. 27 is a diagram for explaining the operation of the device in FIG.
- FIG. 28 is a diagram showing an embodiment of the pipe leakage inspection device according to the present invention.
- FIG. 29 is a diagram for explaining the operation of the device of FIG.
- FIG. 30 is a diagram for explaining the operation of the device of FIG.
- FIG. 31 is a diagram for explaining the operation of the device of FIG.
- FIG. 32 is a diagram for explaining the operation of the device in FIG.
- FIG. 33 is a diagram showing an embodiment of a pipe leakage inspection device according to the present invention.
- FIG. 34 is a diagram for explaining the operation of the device of FIG.
- FIG. 35 is a diagram for explaining the operation of the device of FIG.
- FIG. 36 is a diagram for explaining the operation of the device in FIG.
- FIG. 37 is a diagram for explaining the operation of the apparatus in FIG.
- FIG. 38 is a diagram showing an embodiment of the pipe leakage inspection device according to the present invention.
- FIG. 39 is a diagram for explaining the operation of the device in FIG.
- FIG. 40 is a diagram for explaining the operation of the device in FIG.
- FIG. 41 is a diagram for explaining the operation of the device of FIG.
- FIG. 42 is a diagram for explaining the operation of the device of FIG.
- FIG. 43 is a schematic cross-sectional view for explaining one embodiment of a flow meter used in the pipe leakage inspection device according to the present invention.
- FIG. 44 is a schematic diagram showing an embodiment of a liquid leakage monitoring system using the pipe leakage inspection device according to the present invention.
- FIG. 1 is a schematic cross-sectional view for explaining an embodiment of a flow meter according to the present invention used for carrying out the flow measuring method according to the present invention
- FIG. 2 is a partial perspective view showing the structure thereof. 4 is a partial cross-sectional view
- FIG. 5 is a block diagram showing a flow rate measuring system of the present embodiment
- FIG. 6 is a diagram showing a circuit configuration for detecting the flow rate.
- This embodiment is used for detecting leakage of a liquid in a tank from a tank.
- the liquid in the tank eg, gasoline, light oil or kerosene or other flammable liquid
- the liquid in the tank eg, gasoline, light oil or kerosene or other flammable liquid
- the measuring tube 12 has an upper end opening in the atmosphere and a lower end opening in the liquid 2 in the tank.
- a position slightly above the lower end A measurement capillary 14 extending in the direction is provided, and the liquid 2 in the tank flows through the measurement capillary 14.
- the measurement thin tube 14 is used as a fluid flow passage, and when leakage of the liquid 2 in the tank occurs, replenishment of the liquid into the tank or pumping out of the liquid from the tank is performed. Under the condition not shown, the liquid level of the liquid 2 in the tank is lower than the liquid level in the measuring tube 12 as shown in the figure, and the liquid flows downward in the measuring thin tube 14 based on this.
- the cross-sectional area of the measuring thin tube 14 must be set sufficiently smaller than the cross-sectional area of the measuring tube 12 (for example, 1 Z 50 or less, 1 Z 100 or less, and further 1/300 or less). Thus, even in the case of a slight liquid leak, a liquid flow capable of measuring the flow rate can be generated in the measurement capillary 14.
- an indirectly heated constant-temperature control type flow measurement unit 16 and a two-point temperature difference detection type flow measurement unit 18 are arranged facing the measurement thin tube 14.
- the two fixed-point temperature difference detection type flow measurement units 18 are disposed above and below the indirectly heated constant temperature control type flow measurement unit 16, respectively, and have temperature sensing parts 18 a and 18 b. Further, a temperature sensing section 20 for detecting the temperature of the liquid in the measurement tube 12 is provided.
- the indirect heat constant temperature control type flow rate measuring section 16 includes a heat transfer member 161 arranged in contact with the outer surface of the measurement thin tube 14 and a thin film thermosensitive element (first section) joined to the heat transfer member 161. 1) and a thin-film heating element 163 laminated on the thin-film thermosensitive element 162 via an electrically insulating thin film 164.
- the thin-film temperature sensing element 16 2 and the thin-film heating element 16 3 are each formed in a required pattern, and wiring 16 2 ′ and 16 3 ′ are connected to the electrodes for energizing them. ing.
- the heat transfer member 16 1 is made of, for example, a metal or alloy having a thickness of about 0.2 mm and a width of about 2 mm.
- the thin-film thermosensitive element 16 2, the electrically insulating thin-film 16 4, and the thin-film heating element 16 3 are formed by depositing and forming on a supporting substrate arranged on the side of the thin-film heating element 16 3. It may be joined together with the supporting substrate so that the thin-film temperature sensing element 16 2 faces the heat transfer member 16 1.
- a rectangular substrate having a thickness of about 0.4 mm and a size of about 2 mm square made of, for example, silicon or alumina can be used.
- the wirings 16 2 ′ and 16 3 ′ are connected to wirings (not shown) formed on a wiring board 24 such as a flexible wiring board.
- the heat transfer member 16 1, the thin film temperature sensor 16 2, the electrically insulating thin film 16 4, the thin film heating element 16 3, and the wiring 16 2 ′ and 16 3 ′ are part of the wiring board 24.
- a part of the measuring thin tube 14 is sealed by a sealing member 22 made of a synthetic resin.
- the measuring thin tube 14 extends through one of the temperature sensing portions 18a of the two-point temperature difference detection type flow rate measuring portion.
- the temperature sensing part 18a is composed of a heat transfer member 18 1 arranged in contact with the outer surface of the measuring thin tube 14 and a thin film temperature sensing element (the second temperature sensing member) joined to the heat transfer member 18 1 Body) 18 2.
- the thin-film temperature sensing element 18 2 is formed in a required pattern, and a wiring 18 2 ′ is connected to an electrode for energizing the thin-film temperature sensing element 18 2.
- the heat transfer member 181, like the heat transfer member 161 is made of, for example, a metal or alloy having a thickness of about 0.2 mm and a width of about 2 mm.
- the thin-film temperature sensing element 182 was formed on the supporting substrate as described above, and was joined together with the supporting substrate such that the thin-film temperature sensing element 182 faced the heat transfer member 181. It may be.
- the wiring 18 2 ′ is connected to a wiring (not shown) formed on the wiring board 24.
- the heat transfer member 18 1, the thin-film temperature sensing element 18 2 and the wiring 18 2 ′ are sealed together with a part of the wiring board 20 and a part of the measuring thin tube 14 by a sealing member 23 made of synthetic resin. It has been.
- the other temperature sensing part 18 b of the two fixed point temperature difference detection type flow measurement part also has the same configuration as the temperature sensing part 18 a, and a part of the wiring board 24 and the measurement thin tube 14. Together with a part, it is sealed by a sealing member made of synthetic resin.
- a sealing member made of synthetic resin.
- the thin film temperature sensing element that functions as the second temperature sensing element in the temperature sensing section 18a functions as the third temperature sensing element in the temperature sensing section 18b '.
- the first detection circuit 30 of FIG. 5 is configured.
- the second detection circuit 32 in FIG. 5 is configured to include the temperature sensing element.
- flow value output an output corresponding to the flow value of the indirectly heated constant temperature control type flow measurement (hereinafter referred to as “flow value output” or “flow corresponding output”) Vh is output, and from the second detection circuit 32, two fixed points are output.
- a DC voltage input Vin from a power supply circuit (not shown) is supplied to the bridge circuit 40.
- the bridge circuit 40 includes a temperature sensing part R f including a thin film temperature sensing element 16 2, a temperature sensing part 20 (R c) including a thin film temperature sensing element for temperature compensation, and a thermostat ⁇ R, R 1 and a variable resistor R 2.
- the potentials Va and Vb at points a and b of the bridge circuit 40 are input to the differential amplifier circuit 42.
- the differential amplifier circuit 42 preferably includes a variable resistor, an integrating circuit, and the like for adjusting the response characteristics of the feedback control described below.
- the input V in is supplied to the thin-film heating element 163 via a transistor 44 for controlling a current supplied to the heating section Rh including the thin-film heating element 163.
- the output of the differential amplifier circuit 42 is input to the control input terminal (gate) of the transistor 44. That is, in the indirect heat constant temperature control type flow rate measuring section 16, the thin film heating element 16 3 is affected by the heat absorbed by the liquid via the heat transfer member 16 1 based on the heat generated by the thin film heating element 16 3, and the thin film thermosensitive element 16 2 Is performed. As a result of the temperature sensing, a difference between the potentials Va and Vb at points a and b of the bridge circuit 40 shown in FIG. 6 is obtained.
- the value of (V a -V b) changes when the temperature of the thermosensor 162 changes according to the flow rate of the fluid.
- the value of (V a -V b) can be obtained in the case of a desired fluid flow rate as a reference.
- the value can be zero.
- the output of the differential amplifier circuit 42 is constant (a value corresponding to the reference flow rate), and the resistance value of the transistor 44 is also constant.
- the partial pressure applied to the thin-film heating element 163 also becomes constant, and the voltage output Vh at this time indicates the reference flow rate.
- the output of the differential amplifier circuit 42 changes in polarity (depending on the positive / negative of the resistance-temperature characteristic of the thermosensitive element 16 2) and size according to the value of (V a-V b). Then, the output of the differential amplifier circuit 42 changes accordingly.
- thermosensitive element 16 2 When the fluid flow rate increases, the temperature of the thermosensitive element 16 2 decreases, and the differential amplifier circuit 42 increases the amount of heat generated by the thin-film heating element 16 3 (that is, increases the power). A control input is applied to the gate of the transistor 44 so as to decrease the resistance of the transistor 44.
- the differential amplifier circuit reduces the amount of heat generated by the thin film heating element 16 3 (that is, reduces the power). From 42, a control input for increasing the resistance value of the transistor 44 is made to the gate of the transistor 44.
- the feedback of the heat generated by the thin film heating element 162 is controlled so that the temperature detected by the temperature sensing element 162 becomes the target value regardless of the change in the fluid flow rate. Since the voltage applied to the thin-film heating element 162 at that time corresponds to the fluid flow rate, it is taken out as a flow rate value output Vh.
- the indirectly heated constant-temperature control type flow measurement is performed.
- the heating element and the first temperature sensing element are arranged adjacent to each other, and the heating element detects the temperature of the first temperature sensing element (actually, it corresponds to the detection temperature.
- Feedback control based on the detected electrical characteristics), and obtains the first output corresponding to the flow rate from the state of the feedback control.
- the DC voltage input Vin is supplied to the bridge circuit 46.
- the bridge circuit 46 includes a temperature sensing section 18 a (T 1) including a thin film temperature sensing element 18 2, a temperature sensing section 18 b (T 2) including a thin film temperature sensing element, a resistor R 3, It comprises a variable resistor R4.
- the potentials Vc and Vd at the points c and d of the bridge circuit 46 are input to the differential amplifier circuit 48.
- the thin-film heating element 16 3 generates heat, and a part of the heat is transmitted to the liquid via the heat transfer member 16 1, This is used as a heat source for heating the liquid.
- Control is performed so that the temperature of the thin-film thermosensor (first thermosensor) 16 2 becomes a predetermined value, and this temperature can be set lower than the temperature at which ignition of the liquid occurs depending on the liquid. Therefore, it can be applied to the measurement of the flow rate of flammable fluid.
- the detection temperature of the temperature-sensitive part 18a and the detection temperature of the temperature-sensitive part 18b are the same, but when the liquid flows, the influence of the liquid heating by the heat source is higher than the upstream side. Since the temperature is strongly generated on the downstream side, the temperature detected by the temperature sensing section 18a and the temperature detected by the temperature sensing section 18b become different. Since the voltage output corresponding to the difference between the temperature detected by the temperature sensing section 18a and the temperature detected by the temperature sensing section 18b corresponds to the fluid flow rate, it is set as the flow rate value output Vout.
- the two-point temperature difference detection type flow measurement is performed.
- the two-point temperature difference detection type flow measurement referred to in the present invention is detected by a second temperature sensing element and a third temperature sensing element disposed on the upstream side and the downstream side of the indirectly heated constant temperature control type flow measurement unit, respectively.
- the one that obtains the second flow rate output based on the temperature difference (actually, the difference in electrical characteristics detected in response to the detected temperature difference).
- FIG. 7 shows an example of a calibration curve for Vh conversion
- FIG. 8 shows an example of a calibration curve for Vout conversion.
- an area where the flow value is equal to or more than F1 and equal to or less than F2 is determined in advance as a boundary flow rate area.
- the flow values F 1 and F 2 for setting the upper and lower limits of the boundary flow region are, for example, 1 milliliter / h (mL / h) to 2 milliliter h (mL / h) Can be set to a value within the range.
- the region where the flow value is less than F1 is defined as the low flow region, and the region where the flow value exceeds F2 is defined as the high flow region.
- the output corresponding to the flow value F1 is Vhi
- the output corresponding to the flow value F2 is Vh2.
- the output corresponding to the flow value F 1 is V out 1
- the output corresponding to the flow value F 2 is V out 2. I do.
- the calculation unit 34 outputs a flow rate value obtained based on the first flow rate corresponding output Vh as a measured value for the high flow rate area, and obtains a flow rate value based on the second flow rate corresponding output V 0 ut for the low flow rate area.
- the flow rate value obtained based on the first flow rate corresponding output Vh or the flow rate value obtained based on the second flow rate corresponding output Vout is output as a measured value for the boundary flow rate region. .
- the flow rate of the fluid is measured by the indirect heating constant temperature control type flow rate measurement (that is, the flow rate value obtained based on the first flow rate corresponding output Vh), and the obtained flow rate value is determined in the high flow rate region. (I.e., when the output Vh exceeds Vh2), the flow rate value is output as a measured value. Otherwise, the flow rate of the fluid is measured by a two-point temperature difference detection type flow measurement (i.e., The flow value obtained based on the second flow output Vout is obtained), and the obtained flow value is used as the measured value.
- the indirect heating constant temperature control type flow rate measurement that is, the flow rate value obtained based on the first flow rate corresponding output Vh
- the obtained flow rate value is determined in the high flow rate region.
- the flow rate value is output as a measured value.
- the flow rate of the fluid is measured by a two-point temperature difference detection type flow measurement (i.e., The flow value obtained based on the second flow output Vout is obtained), and the obtained flow value is used
- the flow rate value obtained based on the first flow rate corresponding output Vh belongs to either the flow rate area or the boundary flow rate area (that is, when the output Vh is equal to or more than Vhl)
- the flow rate value is The output value may be output as a measured value, and at other times, the flow value obtained based on the second flow-corresponding output V out may be used as the measured value.
- the flow rate of the fluid is first measured by a two-point temperature difference detection type flow measurement (immediately, the flow value obtained based on the second flow output Vout is obtained), and the obtained flow value is a low flow rate.
- the flow rate value When it belongs to the region (that is, when the output Vout is less than Vout1), the flow rate value is output as a measurement value, and at other times, the flow rate of the fluid is measured by the indirectly heated constant temperature control type flow measurement (ie, The flow value obtained based on the first flow output Vh is obtained), and the obtained flow value is used as the measured value.
- the flow rate value obtained based on the second flow rate corresponding output V out belongs to either the low flow rate area or the boundary flow rate area (that is, when the output V out is equal to or less than V out 2)
- the flow value may be output as a measurement value, and at other times, the flow value obtained based on the first flow output V may be used as the measurement value.
- the boundary flow area may be composed of only one specific flow value.
- This specific flow rate value corresponds to the case where the above F1 and F2 match, and the above description is directly applicable.
- the flow rate (instantaneous flow rate) output from the calculation unit 34 And the integrated flow rate can be calculated.
- the obtained values of the instantaneous flow rate and the integrated flow rate can be displayed as appropriate, can be stored in the memory as appropriate, and can be transmitted to a required external device via an appropriate communication line. it can.
- the flow rate measurement is performed as described above. Based on the flow rate measurement value output from the calculation unit 34 as a result of the flow rate measurement, if the flow rate measurement value exceeds the measurement error, it is determined that the liquid in the tank has leaked. Leaks are detected. This leak detection is preferably performed, for example, at night or the like under the condition that the liquid is not refilled into the tank or the liquid is not pumped out of the tank.
- FIG. 9 shows an embodiment of a liquid leakage monitoring system that utilizes the above-described detection of liquid leakage in a tank and further includes detection of leakage in a piping system.
- FIG. 9 shows a state in which the measuring tube 12 is inserted downward from the measuring port of the underground tank to the liquid 2 in the tank.
- a communication hole (not shown) with the outside air is formed in the upper part of the measurement tube 12.
- a tank leak detection device including the first detection circuit 30, the second detection circuit 32, and the calculation unit 3 is disposed above the measurement tube 12.
- a buried pipe through which the liquid pumped from the tank flows is connected to the tank, and a pipe leak detection device for detecting leakage of the liquid from the pipe is attached.
- the flow measurement method and flow meter according to the present invention as described above can be used.
- the above-mentioned tank leak detecting device and pipe leak detecting device are connected to an individual monitor device installed for each tank so that signals can be transmitted / received through a wired or wireless internal communication means.
- the individual monitoring device will periodically (for example, once a day) inquire each of the tank leak detection device and the pipe leak detection device about the detection result (whether or not there is a leak, and its degree [flow rate], etc.).
- the leak data obtained from the leak detection device is stored in the memory of the individual monitor device.
- the data stored in this memory consists of a part indicating the result of tank leak detection and a part indicating the result of pipe leak detection.
- the above-mentioned individual monitor device is capable of transmitting and receiving signals via a centralized monitor device provided for a plurality of tanks and communication means via a telephone line, the Internet or a dedicated line. From the centralized monitoring device, each individual monitor Then, the above detection result stored in the memory of the individual monitor device is queried as needed. The leaked data obtained from the individual monitor device is stored in the memory of the central monitor device, and is output by displaying and printing as appropriate. The data stored in this memory is the identification number of each individual monitor (or the underground tank monitored by the individual monitor), the corresponding tank leak detection result, and the pipe leak detection. And a part indicating the result.
- the individual monitoring device will be placed in the same location as or near the tank, for example, in a gas station, facility management office, or guardhouse. Note that the functions of the individual monitor device described above for a plurality of tanks may be combined into one composite monitor device. Further, the leakage data stored in the individual monitor device or the composite monitor device can be directly read out from the monitor device and displayed. On the other hand, the centralized monitoring device can be placed at a location independent of the location of each tank, such as a centralized control center or a public inspection organization.
- the flow measuring unit package and the flow measuring unit according to the present invention can be used in the flow meter described with reference to FIGS. 1 to 9 described above.
- the temperature sensing part 18a is the upstream temperature sensing part
- the temperature sensing part 18b is the downstream temperature sensing part.
- an analog circuit is configured including the first detection circuit 30 and the second detection circuit 32.
- the flow value outputs Vh and Vout of the analog circuit are input to the calculation unit 34 shown in FIG.
- a digital circuit is configured including the operation unit 34.
- FIG. 10 is a partially omitted perspective view showing still another embodiment of the flow rate measuring unit package according to the present invention
- FIGS. 11A and 11B are a plan view and a front view, respectively.
- 2A and FIG. 12B are a horizontal sectional view and a vertical sectional view, respectively.
- the part of the indirectly heated constant temperature control type flow measurement unit 16, the upstream temperature sensing unit 18a, the downstream temperature sensing unit 18b, and the fluid flow passage 14 to which these are attached are —Things are housed in 100.
- a first wiring portion electrically connected to the thin-film heating element 163 and the thin-film temperature sensing element 162 of the indirectly heated constant temperature control type flow rate measuring section # 6 is formed.
- the first terminal 1 16 protrudes outward.
- the casing 100 is electrically connected to the thin-film temperature sensor 18 2 of the upstream temperature sensor 18 a.
- the second terminal 118a constituting the second wiring portion is protruded toward the outside, and likewise electrically connects to the thin-film temperature sensing element of the downstream temperature sensing portion 18b.
- a third terminal 118b constituting the connected third wiring portion is protruded outward.
- a temperature sensing part 20 having a temperature sensing element for temperature compensation is accommodated in the casing 100, and the heat sensing member 20 extends outside the casing 100. 2 0 1 is connected.
- the temperature-sensitive portion 20 is such that the heat transfer member extends into the liquid in order to detect the temperature of the liquid as the environmental temperature. 20 detects the ambient temperature around the casing 100 as the environmental temperature.
- the casing 100 has a fourth terminal 120 ′ that constitutes a fourth wiring portion electrically connected to the temperature-sensing temperature sensing element and protrudes outward. In this embodiment, as shown in FIG.
- the first terminal to the fourth terminal are respectively connected to the indirectly heated constant-temperature control type flow measuring unit 16 and the upstream side temperature sensing unit 1 by a bonding wire.
- 8 a connected to a predetermined thin-film heating element or thin-film heating element of the downstream-side temperature sensing section 18 b and the temperature sensing section 20.
- FIGS. 13A and 13B are a plan view and a front view, respectively, showing still another embodiment of the flow measuring unit package according to the present invention
- FIGS. 14A and 14B are cross-sectional views, respectively. It is a figure and a longitudinal cross-sectional view.
- the present embodiment is different from the above-described embodiments of FIGS. 10 to 12B in that the present embodiment does not include the temperature sensing section 20, the heat transfer member 201, and the fourth terminal 120.
- a spare terminal 130 for mounting a flow rate measuring unit to be described later on a unit substrate is provided. It is possible to use some of the spare terminals 130 for wiring.
- FIG. 15 is a perspective view showing an embodiment of the flow rate measuring unit according to the present invention
- FIGS. 168, 168 and 16 ⁇ are a plan view, a front view and a side view, respectively.
- the first to fourth terminals are arranged in parallel with the unit board 220 on which the required circuit is formed by mounting the flow rate measuring package 200 of FIGS. 10 to 12B.
- the unit board 220 is attached to the unit board 220, and the analog circuit element 222 constituting the flow rate measuring circuit element is further attached to the unit board 220.
- the first detection circuit 30 and the second detection circuit 32 shown in FIGS. 5 and 6 are formed.
- the flow rate measurement circuit element may further include a digital circuit element forming the calculation section 34 shown in FIG.
- FIG. 17 is a perspective view showing still another embodiment of the flow measurement unit according to the present invention
- FIGS. 18A, 18B and 18C are a plan view, a front view and a side view, respectively. It is.
- the flow rate measurement unit package 200 is attached to the unit substrate 220 so that the first to fourth terminals are perpendicular to the unit substrate 220. However, it differs from the flow measurement unit shown in Figs.
- FIG. 19 is a perspective view showing still another embodiment of the flow rate measuring unit according to the present invention, and FIG. 20A, FIG. 20B and FIG. It is a side view.
- the flow measurement unit package 200 shown in FIGS. 13A to 14B is used as the flow measurement unit package 200, and the flow measurement unit shown in FIGS. 15 to 18C is used.
- the flow measurement unit package 200 shown in FIGS. 13A to 14B is used as the flow measurement unit package 200
- the flow measurement unit shown in FIGS. 15 to 18C is used.
- FIG. 21 is a cross-sectional view showing one embodiment of the incorporation of the flow measuring unit package according to the present invention into a flow meter.
- a flow rate measurement unit package similar to the embodiment of FIG. 2 is used except for the shape of the wiring board 24. Open end members 15a and 15b are attached to the upper and lower ends of the fluid flow passage 14, respectively.
- the wiring board 24 is connected to the wiring board 25, and the wiring of the wiring board 25 is connected to the wiring in the wiring housing part 25 ′.
- the wiring in the wiring housing 25 ′ is connected to the detection circuits 30 and 32 shown in FIGS.
- FIG. 22 is a sectional view showing still another embodiment of the incorporation of the flow measurement unit according to the present invention into a flow meter.
- the flow measurement unit of the embodiment shown in FIGS. 19 to 20C is used.
- the wiring of the unit board 220 is connected to the wiring in the wiring housing 25 ′.
- the wiring in the wiring housing part 25 ' is connected to the calculation part 34 shown in FIG.
- FIG. 23 is a diagram showing an embodiment of a pipe leakage inspection device according to the present invention.
- an underground tank 1 for a liquid for example, gasoline, light oil or kerosene or other flammable liquid
- a check valve 6 and a shutoff valve 8 are interposed in the piping, At this time, the shut-off valve is opened, and the liquid is transferred upward through the check valve 6 by a pump (not shown) arranged above (downstream in the liquid pumping direction). .
- the section of the pipe 4 from the check valve 6 to the closing valve 8 is the inspection section 7, and this section corresponds to the pipe to be measured in the present invention.
- the pipe 7 to be measured is buried underground, and a branch portion is provided in the middle thereof, and a connection end 5 for connection to a leak inspection device is formed in the branch portion.
- the leakage inspection device 50 of the present embodiment has an internal piping system as illustrated.
- the internal piping system has a connection end 52 for communicating with the pipe 7 to be measured and a liquid discharge end 54.
- the inspection device 50 includes a temporarily stored pressurized liquid tank 56 connected to the internal piping system, and a path from the temporarily stored pressurized liquid tank 56 to the connection end 52 in the internal piping system.
- a pump 58 and a flow meter 60 arranged in order.
- the pump 58 is a gear pump capable of reverse feeding.
- the internal piping system consists of three components: a three-way solenoid valve, a check valve to protect the flow meter, a pressure sensor and four solenoid valves (three of them are normally closed [NC] and the other is one). Has normally open [NO]).
- connection end 5 2 of the inspection device Prior to the inspection, the connection end 5 2 of the inspection device is connected to the connection end 5 of the pipe to be measured, and the connection end 52 is connected to the pipe 7 to be measured. This connection state may be maintained at all times.
- a pipe will be installed between the liquid discharge end 54 of the inspection device and the underground tank 1.
- FIG. 24 shows the liquid supply operation.
- OPEN / CLOSE open / close state
- the pump 58 reverse liquid feed operation
- the piping 7 to be measured passes through the connection terminals 5, 52 and The liquid is transferred to the temporarily stored pressurized liquid tank 56 without passing through the flow meter 60 and the three-way solenoid valve, and the liquid for leak inspection is stored in the temporarily stored pressurized liquid tank 56.
- This liquid transfer path is the first path.
- FIG. 25 shows the pressurizing operation during a leak test.
- the liquid is pumped from the tank 56 through the three-way solenoid valve, the flow meter 60 and the connection terminals 52, 5 to the pipe 7 to be measured. This liquid transfer path is the second path.
- the pump 5 When the pressure sensor detects that the fluid pressure in the portion from the pump 58 to the connection end 52 in the second path exceeds a set value (for example, 20 kPa), the pump 5 The three-way solenoid valve located between 8 and the flow meter 60 is opened to the NC side, and a path (fourth path) for returning the liquid to the temporarily stored pressurized liquid tank 56 is formed. The operation of such a three-way solenoid valve is controlled based on a command from a CPU in the flow meter 60 to which a signal of a set pressure value excess is input from a pressure sensor.
- a set value for example, 20 kPa
- Figure 26 shows the pressure relief operation at the end of the test.
- the pump 58 By stopping the operation of the pump 58 and setting the open / close state of the four solenoid valves as shown in the figure, at least a part of the portion from the flow meter 60 to the connection end 52 in the second path ( Release the liquid pressure (downstream from the check valve for flow meter protection) and return a part of the liquid to the temporarily stored pressurized liquid tank 56.
- This liquid transfer path is the fifth path.
- Figure 27 shows the drainage operation after the end of the test.
- the open / close state of the four solenoid valves is set as shown in the figure, and the pump 58 is actuated (progressive liquid operation) to pass from the temporarily stored pressurized liquid tank 56 through the three-way solenoid valve and the flow meter 60. Further, the liquid is transferred to the liquid discharge end 54 through another parallel path, and the liquid is returned to the underground tank 1. This liquid transfer path is the third path.
- FIG. 28 is a diagram showing still another embodiment of the pipe leakage inspection device according to the present invention. ⁇ This embodiment differs from the embodiment of FIGS. 23 to 27 in that a three-way solenoid valve is used instead of a three-way solenoid valve. The difference is that a three-way solenoid valve is used instead of one solenoid valve.
- FIG. 29 shows the liquid supply operation. This operation is equivalent to that described with reference to FIG.
- FIG. 30 shows the pressurizing operation at the time of leakage inspection. This operation is substantially the same as that described with reference to FIG. 25, except that the hydraulic pressure in the second path from the pump 58 to the connection end 52 becomes equal to the set value of the pressure-regulating check valve (for example, When the pressure exceeds 20 kPa), the pressure check valve opens to form a path (fourth path) for returning the liquid to the temporarily stored pressurized liquid ink nozzle 56.
- the pressure-regulating check valve for example, When the pressure exceeds 20 kPa
- the pressure check valve opens to form a path (fourth path) for returning the liquid to the temporarily stored pressurized liquid ink nozzle 56.
- FIG. 31 shows the pressure relief operation at the end of the test. This operation is equivalent to that described with reference to FIG.
- Figure 32 shows the drainage operation after the end of the test. This operation is equivalent to that described with reference to Figure 27.
- FIG. 33 is a view showing still another embodiment of the pipe leakage inspection device according to the present invention.
- an electromagnetic pump that cannot be fed back is used as the pump 58 ′, and the internal piping is used.
- the system uses two solenoid valves and three three-way solenoid valves.
- FIG. 34 shows the liquid supply operation.
- the first path is formed through three three-way solenoid valves.
- Figure 35 shows the pressurizing operation during the leak inspection.
- the second path is formed through two three-way solenoid valves, and the fourth path is formed through one three-way solenoid valve.
- Figure 36 shows the pressure relief operation at the end of the test.
- the fifth path is formed through one three-way solenoid valve.
- Figure 37 shows the drainage operation after the end of the test.
- the third path is formed without passing through the flow meter 60 and through three three-way solenoid valves.
- FIG. 38 is a diagram showing still another embodiment of the pipe leakage inspection device according to the present invention. ⁇ This embodiment is different from the embodiment of FIGS. 33 to 37 in that a check valve for pressure regulation is added. What they did was different.
- the operation of the leak inspection apparatus according to the present embodiment will be described with reference to FIGS. 39 to 42 together with the functions of the internal piping system. However, here, the points different from the embodiment of FIGS. 33 to 37 will be mainly described.
- FIG. 39 shows the liquid supply operation. This operation is equivalent to that described with reference to FIG.
- FIG. 40 shows the pressurizing operation at the time of leakage inspection.
- the second path is equivalent to that of FIG. 35, but the fourth path is formed through a check valve for pressure regulation.
- Figure 41 shows the pressure relief operation at the end of the test. This operation is equivalent to that described with reference to FIG.
- Figure 42 shows the drainage operation after the end of the test. This operation is equivalent to that described with reference to Figure 37.
- the inspection apparatus itself takes in the liquid transferred in the pipe to be measured and uses it as the pressurized liquid to perform the pressurized inspection. There is no need to extract the liquid from the pipe to be measured beforehand, store it in another place, return it after the inspection, or introduce gas or liquid for the inspection, which significantly reduces the inspection work.
- an inspection device can be connected to the connection end of the pipe to be measured at all times, continuous inspection is easy, and early detection of leakage is possible.
- the flow meter 60 Although there is no particular limitation on the flow meter 60, a flow meter capable of measuring a small amount is preferable. Examples of the flow meter that can accurately measure a minute flow rate to a relatively large flow rate are the same as those described with reference to FIGS. 1 to 9 described above.
- FIG. 43 is a schematic sectional view for explaining one embodiment of the flow meter 60.
- This flow meter 60 is structurally equivalent to that of FIG. 1 described above, and the description of FIGS. 1 to 8 is directly applicable.
- a measuring thin tube 14 is provided in a cylindrical measuring tube 12, and a liquid (fluid) flows through the measuring thin tube 14.
- the measuring thin tube 14 is used as a fluid flow passage constituting an internal piping system. If leakage of the liquid from the piping 7 to be measured occurs, a predetermined Pressurized state After the realization, the liquid flows in the measuring capillary 14 in the direction of the arrow.
- the flow rate is measured in the same manner as described with reference to FIGS. 1 to 8, and if the measured flow rate exceeds the measurement error based on the flow rate Leak detection is performed to determine that there is leakage of liquid in the measurement pipe.
- This leak detection is preferably performed, for example, at night or the like when the liquid is not refilled into the tank or the liquid is not pumped out of the tank.
- Fig. 44 shows an embodiment of a liquid leak monitoring system that uses the above-mentioned pipe leak detection and also includes underground tank leak detection.
- Fig. 44 shows a state in which the tank leak detection device (tank leak inspection device) 1 1 2 is inserted downward from the measuring port in the basement evening to the liquid 2 in the tank. In this evening leak detection device, the flow meter as described above can be used.
- a pipe leak detection device (pipe leak inspection device) 50 for detecting leakage of liquid from the pipe 7 to be measured is provided.
- the above-mentioned tank leak detecting device and pipe leak detecting device are connected to individual monitor devices installed for each tank so that signals can be transmitted and received by internal communication means by wire or wireless. This connection is made, for example, via an I / O interface provided in a pipe leak detection device or the like, as shown in FIG. From an individual monitor, the results of inspection (inspection) of the tank leak detector and the pipe leak detector at regular intervals (for example, once a day) (existence and degree of leakage, ] Etc.).
- the leak data obtained from the leak detection device is stored in the memory of the individual monitor-device.
- the data stored in the memory 1 includes a portion indicating the result of tank leak detection and a portion indicating the result of pipe leak detection.
- the items described with reference to FIG. 9 above apply. Industrial applicability
- a flow measurement method and a flow meter capable of performing flow measurement with good accuracy and sensitivity over a wide flow range from a very small flow region to a relatively large flow region Is provided.
- the fluid Provided is a flow measurement method and a flow meter with sufficiently reduced danger of fire due to ignition even when the liquid is a flammable liquid such as fuel oil. Therefore, it is possible to easily and accurately detect even a small amount of fluid leakage safely using the flow rate measuring method and the flow meter according to the present invention.
- a flow measurement unit package and a flow measurement unit are provided.
- a pipe leak inspection device capable of easily and accurately detecting even a minute leak. Further, according to the present invention, it is possible to easily and efficiently perform a leak test while leaving a liquid that can be transferred through the pipe in the pipe and using the liquid as a pressurized liquid. An inspection device is provided.
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Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2004-7013477A KR20040097136A (ko) | 2002-03-20 | 2003-03-18 | 유량 측정 방법 및 유량계, 그것에 사용하는 유량 측정부패키지 및 그것을 사용한 유량 측정 유닛, 그리고유량계를 사용한 배관 누출 검사장치 |
US10/508,095 US6973827B2 (en) | 2002-03-20 | 2003-03-18 | Flow rate measuring method and flowmeter, flow rate measuring section package used for them and flow rate measuring unit using them, and piping leakage inspection device using flowmeter |
EP03744524A EP1491866A4 (en) | 2002-03-20 | 2003-03-18 | FLOW SPEED MEASURING METHOD AND FLOWMETER, FLOW SPEED MEASUREMENT CIRCUIT HOUSING USED, AND FLOW SPEED MEASURING UNIT THEREFOR AND FLUSH TESTING DEVICE WITH FLOWMETER |
US11/198,799 US7028533B2 (en) | 2002-03-20 | 2005-08-05 | Flow rate measuring method and flowmeter, flow rate measuring section package used for them and flow rate measuring unit using them, and piping leakage inspection device using flowmeter |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2002-079180 | 2002-03-20 | ||
JP2002079180A JP2003279395A (ja) | 2002-03-20 | 2002-03-20 | 流量測定方法及び流量計 |
JP2002-083412 | 2002-03-25 | ||
JP2002083412A JP2003279437A (ja) | 2002-03-25 | 2002-03-25 | 配管の漏洩検査装置 |
JP2002-105336 | 2002-04-08 | ||
JP2002105336A JP4125030B2 (ja) | 2002-04-08 | 2002-04-08 | 流量測定部パッケージ及びそれを用いた流量測定ユニット |
Related Child Applications (2)
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US10508095 A-371-Of-International | 2003-03-18 | ||
US11/198,799 Division US7028533B2 (en) | 2002-03-20 | 2005-08-05 | Flow rate measuring method and flowmeter, flow rate measuring section package used for them and flow rate measuring unit using them, and piping leakage inspection device using flowmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003078934A1 true WO2003078934A1 (fr) | 2003-09-25 |
Family
ID=28046109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/003251 WO2003078934A1 (fr) | 2002-03-20 | 2003-03-18 | Procede de mesure de debit et debitmetre, ensemble section de mesure de debit utilise pour ceux-ci et unite de mesure de debit les utilisant, et dispositif d'inspection de fuite de canalisations utilisant un debitmetre |
Country Status (5)
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US (2) | US6973827B2 (ja) |
EP (1) | EP1491866A4 (ja) |
KR (1) | KR20040097136A (ja) |
CN (1) | CN1643344A (ja) |
WO (1) | WO2003078934A1 (ja) |
Cited By (3)
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WO2005043104A1 (ja) * | 2003-10-31 | 2005-05-12 | Mitsui Mining & Smelting Co., Ltd. | タンク内液体の漏れ検知装置 |
CN109741843A (zh) * | 2018-12-13 | 2019-05-10 | 中核北方核燃料元件有限公司 | 一种核燃料组件流量检测装置 |
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JP2019035640A (ja) * | 2017-08-14 | 2019-03-07 | アズビル株式会社 | 熱式流量計 |
CN107796456B (zh) * | 2017-10-16 | 2020-02-18 | 东南大学 | 一种基于双检测模式的宽量程流量传感器及测量方法 |
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CN116066764A (zh) * | 2023-02-22 | 2023-05-05 | 河北君业科技股份有限公司 | 一种热力管道泄漏检测定位方法 |
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US6161423A (en) * | 1998-03-20 | 2000-12-19 | Unisia Jecs Corporation | Apparatus and method for diagnosing leaks of fuel vapor treatment unit |
DE29906451U1 (de) * | 1999-04-12 | 2000-09-14 | Busch Dieter & Co Prueftech | Vorrichtung zum Messen der Durchflußrate eines Mediums durch eine Leitung |
JP4050857B2 (ja) * | 1999-04-27 | 2008-02-20 | 矢崎総業株式会社 | 流体判別装置及び流量計測装置 |
US6208254B1 (en) * | 1999-09-15 | 2001-03-27 | Fluid Components Intl | Thermal dispersion mass flow rate and liquid level switch/transmitter |
US6269678B1 (en) * | 2000-02-22 | 2001-08-07 | Vaporless Manufacturing Inc. | Leak detector |
JP3820168B2 (ja) * | 2002-03-15 | 2006-09-13 | オリンパス株式会社 | リークテスタ |
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- 2003-03-18 WO PCT/JP2003/003251 patent/WO2003078934A1/ja not_active Application Discontinuation
- 2003-03-18 CN CNA038065290A patent/CN1643344A/zh active Pending
- 2003-03-18 EP EP03744524A patent/EP1491866A4/en not_active Withdrawn
- 2003-03-18 KR KR10-2004-7013477A patent/KR20040097136A/ko not_active Application Discontinuation
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2005
- 2005-08-05 US US11/198,799 patent/US7028533B2/en not_active Expired - Lifetime
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005043104A1 (ja) * | 2003-10-31 | 2005-05-12 | Mitsui Mining & Smelting Co., Ltd. | タンク内液体の漏れ検知装置 |
US7334455B2 (en) | 2003-10-31 | 2008-02-26 | Mitsui Mining & Smelting Co., Ltd. | Leak detector of liquid in tank |
EP3597326A4 (en) * | 2017-03-17 | 2020-11-11 | Sintokogio, Ltd. | FOUNDRY SAND BIN FEEDING DEVICE AND BIN FEEDING PROCESS |
CN109741843A (zh) * | 2018-12-13 | 2019-05-10 | 中核北方核燃料元件有限公司 | 一种核燃料组件流量检测装置 |
Also Published As
Publication number | Publication date |
---|---|
US20050155421A1 (en) | 2005-07-21 |
US7028533B2 (en) | 2006-04-18 |
EP1491866A1 (en) | 2004-12-29 |
KR20040097136A (ko) | 2004-11-17 |
CN1643344A (zh) | 2005-07-20 |
US20060005620A1 (en) | 2006-01-12 |
US6973827B2 (en) | 2005-12-13 |
EP1491866A4 (en) | 2006-06-07 |
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