JP2012083260A - Method of installing air velocity measuring device and air velocity measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce bedewing in the vicinity of an ultrasonic transmitter and an ultrasonic receiver in an air velocity measuring device which detects an air velocity within piping.SOLUTION: An air velocity measuring device 1 includes: a vortex generator 24 which generates a Karman vortex in a fluid flowing inside piping 130; an ultrasonic transmitter 20 disposed at a downstream side of the vortex generator 24; and an ultrasonic receiver 22 which is disposed while being spaced apart from the ultrasonic transmitter 20 at a predetermined interval oppositely with the vortex generator 24 therebetween. The air velocity measuring device 1 counts the number of Karman vortexes passed between the ultrasonic transmitter 20 and the ultrasonic receiver 22 on the basis of a reception signal of the ultrasonic receiver 22 and measures an air velocity from the counted number of Karman vortexes. When installing the air velocity measuring device 1 in the piping 130, the ultrasonic transmitter 20 and the ultrasonic receiver 22 are tilted in a perpendicular direction and the ultrasonic transmitter 20 and the ultrasonic receiver 22 are opposed at a right angle to a moving direction of the fluid flowing in the piping 130.

Description

  The present invention relates to an installation method of a wind speed measuring device for detecting the wind speed of exhaust gas sent to an exhaust pipe and a wind speed measuring device.

  Conventionally, exhaust gas generated from a facility of a nuclear power plant is discharged through an exhaust pipe after removing harmful components. The pipe for sending the exhaust gas to the exhaust pipe is provided with a wind speed measuring device, and the presence or absence of abnormality in the piping system is managed by measuring the moving speed of the exhaust gas with this wind speed measuring device.

  Conventionally, as this type of wind speed measuring apparatus, an ultrasonic vortex flow meter as shown in Patent Document 1, that is, a vortex generator for generating Karman vortices in a fluid flowing in a measurement pipe, and vortex generation An ultrasonic transmitter and an ultrasonic receiver arranged opposite to each other on the downstream side of the body, and a signal obtained by modulating a signal transmitted from the ultrasonic transmitter by the Karman vortex is received by the ultrasonic receiver. An ultrasonic vortex flowmeter is used to measure the flow rate.

JP 2005-308630 A

  However, in the ultrasonic vortex flowmeter shown in Patent Document 1, if water droplets adhere to at least one of the ultrasonic transmitter and the ultrasonic receiver, the measurement error of the instrument becomes large and the measurement accuracy of the Karman vortex may be reduced. There is. In particular, if the temperature decreases in a state where a large amount of moisture is contained in the exhaust gas generated from the power generation facility, there is a possibility that condensed water adheres to the ultrasonic transmitter and the ultrasonic receiver.

  An object of the present invention is to solve such problems and to provide a wind speed measuring device installation method and a wind speed measuring device that realizes reduction of condensed water near an ultrasonic transmitter and an ultrasonic receiver. To do.

  In order to achieve the above object, the present invention has the following configuration.

  (1) A vortex generator that generates Karman vortices in a fluid flowing in a pipe, an ultrasonic transmitter disposed on the downstream side of the vortex generator, and a predetermined interval between the ultrasonic transmitter and the vortex The Karman vortex that has passed between the ultrasonic transmitter and the ultrasonic receiver based on a reception signal of the ultrasonic receiver. When the ultrasonic vortex flowmeter for measuring the fluid flow rate from the Karman vortex count number is installed in the pipe, the ultrasonic transmitter and the ultrasonic receiver are arranged in the vertical direction. The installation method of the wind velocity measuring device is characterized in that the ultrasonic transmitter and the ultrasonic receiver are opposed to each other at right angles to the moving direction of the fluid flowing in the pipe.

  According to (1), since the ultrasonic transmitter and the ultrasonic receiver are inclined with respect to the vertical direction, the condensed water is inclined when the condensed water is generated in the ultrasonic transmitter and the ultrasonic receiver. Will fall along. Thereby, it becomes possible to reduce the dew condensation water near the ultrasonic transmitter and the ultrasonic receiver.

  (2) The installation method of the wind speed measuring device according to (1), wherein a water repellent agent is applied to the ultrasonic transmitter and its periphery and the ultrasonic receiver and its periphery.

  According to (2), when the water repellent is applied to the ultrasonic transmitter and its periphery and the ultrasonic receiver and its periphery, the dew condensation water adhering to the region where the water repellent is applied becomes slippery. Therefore, the ultrasonic transmitter and its surroundings, and the condensed water generated in the ultrasonic receiver and its surroundings easily fall along the inclination.

  (3) A vortex generator that generates Karman vortices in the fluid flowing in the pipe, an ultrasonic transmitter disposed on the downstream side of the vortex generator, and an opposing arrangement with a predetermined interval between the ultrasonic transmitters And counting the number of Karman vortices that have passed between the ultrasonic transmitter and the ultrasonic receiver based on the received signal of the ultrasonic receiver and the ultrasonic receiver, Flow velocity measuring means for measuring the flow velocity of the fluid from the number of counts, air jetting means for jetting air toward the ultrasonic transmitter and the ultrasonic receiver, and ultrasonic transmission based on the ultrasonic receiver A wind speed measuring apparatus comprising: an ejection control unit that drives the air ejection unit when it is determined whether or not condensation has occurred in the air conditioner and the ultrasonic receiver.

  According to (3), when dew condensation water is generated in the ultrasonic transmitter and the ultrasonic receiver, the air blowing means blows out air toward the ultrasonic transmitter and the ultrasonic receiver, thereby causing dew condensation. Water is blown away. Thereby, the dew condensation water in an ultrasonic transmitter and the said ultrasonic receiver can be reduced.

  (4) The wind speed measuring device according to (3), wherein a water repellent agent is applied to the ultrasonic transmitter and its periphery and the ultrasonic receiver and its periphery.

  According to (4), when the water repellent is applied to the ultrasonic transmitter and its periphery and the ultrasonic receiver and its periphery, the condensed water adhering to the area where the water repellent is applied becomes slippery. Therefore, the dew condensation water is easily blown away by the air ejected from the air ejection means.

  (5) A vortex generator that generates Karman vortices in the fluid flowing in the pipe, an ultrasonic transmitter disposed downstream of the vortex generator, and a predetermined interval between the ultrasonic transmitters And counting the number of Karman vortices that have passed between the ultrasonic transmitter and the ultrasonic receiver based on the received signal of the ultrasonic receiver and the ultrasonic receiver, A flow velocity measuring means for measuring the flow velocity of the fluid from the count number, a heating means for heating the ultrasonic transmitter and the ultrasonic receiver, a dew point temperature in the pipe is obtained, and the ultrasonic transmitter and A wind speed measuring apparatus comprising: a heating control unit that drives a heating unit so that a temperature of the ultrasonic receiver is higher than the dew point temperature.

  According to (5), the heating device is controlled so that the temperature of the ultrasonic transmitter and the ultrasonic receiver becomes higher than the dew point temperature in the pipe, whereby the ultrasonic transmitter and the ultrasonic wave are controlled. Generation of condensed water in the receiver can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the dew condensation water near an ultrasonic transmitter and an ultrasonic receiver, and it becomes possible to provide the wind speed measuring apparatus which can measure a wind speed more correctly.

It is explanatory drawing which shows the system configuration | structure of the nuclear power plant provided with the wind speed measuring apparatus of embodiment of this invention. It is a side view which shows the structure of the wind speed measuring apparatus of 1st Embodiment of this invention. It is a front view which shows the external appearance of a wind speed detection part. It is a side view which shows the principal part structure of a wind speed detection part. It is an external view which shows the state which attached the wind speed measuring apparatus to piping. It is explanatory drawing which shows the state in the piping of FIG. It is a block diagram which shows the electrical structure of a wind speed measuring apparatus. It is explanatory drawing which shows schematic structure of the wind speed measuring apparatus of 2nd Embodiment of this invention. It is a block diagram which shows the electrical constitution of the wind speed measuring apparatus of 2nd Embodiment of this invention. It is explanatory drawing which shows schematic structure of the wind speed measuring apparatus of 3rd Embodiment of this invention. It is a block diagram which shows the electrical constitution of the wind speed measuring apparatus of 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a system configuration of a nuclear power plant provided with a wind speed measuring device according to an embodiment of the present invention. The nuclear power plant includes a nuclear reactor facility 100, a turbine building 110, an exhaust pipe 150, and the like. A nuclear reactor 102 is provided in the nuclear reactor facility 100. The turbine building 110 is provided with a turbine 112 and a condenser 114. Then, water is supplied to the nuclear reactor 102, and the water is heated by the nuclear reactor 102 to generate steam. Steam generated in the nuclear reactor facility 100 is supplied to the turbine building 110 and rotates a turbine 112 by the power of the steam, thereby rotating a generator (not shown) connected to the turbine 112. Thereby, power generation is performed. The steam that has passed through the turbine 112 is returned to water by the condenser 114 and is supplied again to the nuclear reactor 102 by a water supply pump (not shown).

  A piping 104 is connected to the nuclear reactor facility 100, and a filter 120 is connected to the piping 104. Further, a pipe 106 is connected to the filter 120, and a pipe 130 that is directly connected to the exhaust pipe 150 is connected to the pipe 106. Further, a pipe 116 is connected to the turbine building 110, and a filter 122 is connected to the pipe 116. Further, a pipe 130 is connected to the filter 122.

  Further, the wind speed measuring device 1 is installed in the pipe 130. Here, the pipe 106 and the pipe 130 merge on the downstream side of the wind speed measuring device 1.

  The exhaust gas from the nuclear reactor facility 100 is sent to the filter 120 via the pipe 104. After harmful substances are removed by the filter 120, the exhaust gas is discharged from the exhaust pipe 150 to the atmosphere through the pipe 116 and the pipe 130. The exhaust gas from the turbine building 110 is sent to the filter 122 via the pipe 116. The exhaust gas is sent to the exhaust pipe 150 through the pipe 130 after harmful substances are removed by the filter 122.

  Further, the flow rate of the exhaust gas before joining the pipe 104 (hereinafter referred to as wind speed) in the exhaust gas in the pipe 130 is measured by the wind speed measuring device 1 and the detection result is sent to a management room (not shown).

[First Embodiment]
FIG. 2 is a side view showing the configuration of the wind speed measuring apparatus according to the first embodiment of the present invention. The wind speed measuring device 1 includes a wind speed detection unit 10, a conversion unit 12, a probe 14, and a fixing unit 16. The wind speed detection unit 10 is provided at one end of the probe 14, and the conversion unit 12 is provided at the other end of the probe 14. The fixed portion 16 is provided at the center of the probe 14.

  The wind speed detection unit 10 will be described in detail with reference to FIG. 3, but includes an ultrasonic transmitter 20 (see FIG. 3) and an ultrasonic receiver 22 (see FIG. 3). A Karman vortex is generated and transmitted from the ultrasonic transmitter 20 (see FIG. 3) by the Karman vortex passing between the ultrasonic transmitter 20 (see FIG. 3) and the ultrasonic receiver 22 (see FIG. 3). The ultrasonic waves are modulated, and the modulated ultrasonic waves are detected by the ultrasonic receiver 22 (see FIG. 3) and output as electrical signals.

  The conversion unit 12 is equipped with a power source (not shown) for driving the wind speed detection unit 10 and a control circuit 50 (see FIG. 7) for obtaining the wind speed based on an electrical signal from the ultrasonic receiver 22. A control board (not shown) is provided. The control circuit 50 (see FIG. 7) performs control to increase the count of the counter every time the passage of the Karman vortex is detected from the electrical signal from the ultrasonic receiver 22. In other words, the control circuit 50 (see FIG. 7) performs a process of counting the number of Karman vortices. And the process which calculates | requires a wind speed based on the number of Karman vortices in predetermined time is performed.

  In the probe 14, a power supply line (not shown) for supplying power to the wind speed detection unit 10 and a lead wire (signal line for transmitting an electric signal from the wind speed detection unit 10 to the conversion unit 12 ( (Not shown).

  When the wind speed measuring device 1 is installed in the pipe 130 (see FIG. 1), the fixing unit 16 is connected to the pipe 130 (see FIG. 1) so as to maintain a sealed state.

  FIG. 3 is a front view showing the appearance of the wind speed detection unit. FIG. 4 is a side view showing the main structure of the wind speed detector. The wind speed detection unit 10 includes an ultrasonic transmitter 20, an ultrasonic receiver 22, a vortex generator 24, and a housing 26. The casing 26 is formed with an opening 26a that penetrates in a direction perpendicular to the longitudinal direction of the probe 14 and has a substantially rectangular shape when viewed from the front. Of the four side surfaces forming the opening 26a, the ultrasonic transmitter 20 and the ultrasonic receiver 22 are respectively installed on the side surfaces of the probe 14 facing the longitudinal direction. The ultrasonic transmitter 20 is fixed to the side surface close to the probe 14, and the ultrasonic receiver 22 is disposed opposite to the ultrasonic transmitter 20 with a predetermined interval. Further, in the four side surfaces forming the opening 26a, the central portions of the pair of side surfaces where the ultrasonic transmitter 20 and the ultrasonic receiver 22 are not installed are perpendicular to the longitudinal direction of the probe 14, A rod-shaped member that becomes the vortex generator 24 is disposed. The vortex generator 24 is located between the ultrasonic transmitter 20 and the ultrasonic receiver 22 when viewed from the front, as shown in FIG. 3, and as shown in FIG. When viewed, it is disposed upstream of the ultrasonic transmitter 20 and the ultrasonic receiver 22 in the direction in which the exhaust gas flows.

  Moreover, as shown in FIG. 4, in the four side surfaces forming the opening 26a, the pair of side surfaces on which the ultrasonic transmitter 20 and the ultrasonic receiver 22 are respectively installed are from the central portion toward the upstream side. The slope is widened. Here, the vortex generator 24 is installed on the upstream side in the direction in which the exhaust gas flows from the central part, and the ultrasonic transmitter 20 and the ultrasonic receiver 22 are installed on the downstream side from the central part.

  Further, a water repellent layer 30 is formed on the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22 and the periphery thereof. The water repellent layer 30 is formed by applying a water repellent. The water repellent layer 30 is desirably formed when the wind speed measuring device 1 is installed in the pipe 130. Further, a water repellent may be applied to the entire casing 26 including the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22.

  FIG. 5 is an external view showing a state in which the wind speed measuring device is attached to the pipe, and FIG. 6 is an explanatory view showing a state in the pipe of FIG. The pipe 130 is provided with an attachment portion 132 for attaching the wind speed measuring device 1, and after the wind speed detection unit 10 and the probe 14 are inserted from the attachment portion 132, the fixing portion 16 is fixed to the attachment portion 132. As a result, the wind speed detection unit 10 is positioned inside the pipe 130.

  Inside the pipe 130, the wind speed detection unit 10 is positioned such that the opening 26 a is along the axial direction of the pipe 130 as shown in FIG. 6. The probe 14 is fixed in a state where it is inclined at a predetermined angle with respect to the vertical direction. In this embodiment, it is fixed in a state where it is inclined by 45 ° with respect to the vertical direction. As a result, the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22 on which the water repellent layer 30 is formed are inclined by 45 ° with respect to the vertical direction. Further, when the wind velocity measuring device 1 is attached to the pipe 130, the ultrasonic transmitter 20 and the ultrasonic receiver 22 are perpendicular to the moving direction of the exhaust gas flowing in the pipe 130 (the direction in which FIG. 6 is viewed from the front). Opposite to.

  FIG. 7 is a block diagram showing an electrical configuration of the wind speed measuring apparatus. The control circuit 50 includes a CPU 52, a memory 54, and an external terminal 56. Further, the ultrasonic transmitter 20 and the ultrasonic receiver 22 are connected to the control circuit 50.

  The CPU 52 controls the entire wind speed measuring device 1. The memory 54 stores various programs for controlling the wind speed measuring device 1. For example, a program for executing a process for detecting Karman vortices from an electrical signal from the ultrasonic receiver 22 or a value obtained by adding 1 to a count value stored in a predetermined area of the memory 54 when a Karman vortex is detected. A program to be updated is stored. The external terminal 56 is connected to an external electronic device so that the wind speed measurement result can be output to the external electronic device.

  Next, a wind speed measuring method by the wind speed measuring apparatus 1 will be described with reference to FIGS. 4 and 7. As shown in FIG. 4, part of the exhaust gas in the pipe 130 passes through the opening 26 a of the wind speed measuring device 1. When exhaust gas passes through the vortex generator 24, the vortex generator 24 becomes an obstacle and a Karman vortex is generated, and this Karman vortex passes between the ultrasonic transmitter 20 and the ultrasonic receiver 22. At this time, the ultrasonic wave transmitted from the ultrasonic transmitter 20 toward the ultrasonic receiver 22 is modulated by the Karman vortex, and the ultrasonic receiver 22 receives the modulated ultrasonic wave. Further, the ultrasonic receiver 22 converts the received ultrasonic wave into an electric signal and transmits the electric signal to the control circuit 50 (see FIG. 7) of the conversion unit 12. In FIG. 7, the CPU 52 of the control circuit 50 detects whether or not the electrical signal of the ultrasonic receiver 22 exceeds a predetermined level, and when it is determined that it has exceeded, a predetermined area of the memory 54 that functions as a counter. The count value is updated to a value obtained by adding 1. Thus, the CPU 52 corresponds to a flow velocity measuring unit.

  Then, the CPU 52 obtains the wind speed based on the count value within a predetermined time, and the obtained wind speed is transmitted to the management room via the external terminal 56, and the wind speed is displayed on the monitor in the management room or is displayed on the external terminal 56. The wind speed is monitored by transmitting to an externally connected display device (not shown) and displaying the monitor on the spot.

  By the way, when the exhaust gas passing through the pipe 130 contains a large amount of moisture, when the air temperature (temperature in the pipe 130) decreases, condensed water is generated in the ultrasonic transmitter 20 and the ultrasonic receiver 22. There is a risk of adhesion. Here, according to the present embodiment, even if condensed water adheres to the ultrasonic transmitter 20 and the ultrasonic receiver 22, the water repellent layer 30 is formed on the ultrasonic transmitter 20 and the ultrasonic receiver 22. In addition, since the ultrasonic transmitter 20 and the ultrasonic receiver 22 are inclined by 45 ° with respect to the vertical direction, the condensed water flows down along the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22. It becomes like this.

  As described above, according to the first embodiment, when condensed water adheres to the ultrasonic transmitter 20 and the ultrasonic receiver 22, the condensed water moves along the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22. Since it flows down, the dew condensation water near the ultrasonic transmitter 20 and the ultrasonic receiver 22 can be reduced. As a result, it is possible to reduce the instrument measurement error due to condensation, and to improve the measurement accuracy of the Karman vortex, it is possible to obtain a reliable measurement value of the wind speed.

[Second Embodiment]
FIG. 8 is an explanatory diagram showing a schematic configuration of a wind speed measuring apparatus according to the second embodiment of the present invention. In addition, in the wind speed measuring apparatus of 2nd Embodiment shown in FIG. 8, the member same as the member in the wind speed measuring apparatus of 1st Embodiment shown in FIGS. A detailed description is omitted.

  The wind speed measuring apparatus 1 of the second embodiment shown in FIG. 8 is provided with an air purge set 60 corresponding to the air jetting means, in addition to the wind speed measuring apparatus 1 of the first embodiment shown in FIG.

  The air purge set 60 has a distal end bent at 90 °, and includes an insertion pipe 62 to be inserted into the pipe 130, a moving mechanism 64 for sliding the insertion pipe 62 along the same direction as the probe 14, and an insertion pipe 62. An air supply device 66 for supplying air is provided.

  The insertion pipe 62 is installed on the downstream side in the movement direction of the exhaust gas with respect to the attachment position of the wind speed measuring device 1 in the pipe 130. Further, the insertion tube 62 is slidable along the same direction as the probe 14, and by controlling the movement of the moving mechanism 64, as shown in FIG. It can be made to oppose the opening part 26a of the part 10, and as shown in FIG.8 (b), it can evacuate out of the piping 130. FIG.

  FIG. 9 is a block diagram showing an electrical configuration of the wind speed measuring apparatus. The control circuit 50 includes a CPU 52, a memory 54, and an external terminal 56. Further, the ultrasonic transmitter 20, the ultrasonic receiver 22, the moving mechanism 64, and the air supply device 66 are connected to the control circuit 50.

  The CPU 52 controls the entire wind speed measuring device 1. In addition to the program for controlling the wind speed measuring device 1, the memory 54 stores a program for controlling the moving mechanism 64, a program for controlling the air supply device 66, and the like.

  Next, control of the moving mechanism 64 and the air supply device 66 will be described. First, when the wind speed measuring device 1 is installed in the pipe 130 and measurement of the wind speed is started, the CPU 52 of the control circuit 50 performs initial setting, and based on the output of the ultrasonic receiver 22, the frequency and amplitude of the ultrasonic waves are set. Control to store the waveform and the like in the memory 54 is performed. Thereafter, the CPU 52 of the control circuit 50 compares the ultrasonic frequency, amplitude, waveform, etc. stored in the memory 54 with the measured value of the wind speed output from the ultrasonic receiver 22 every predetermined time, Determine the amount of attenuation. When the CPU 52 determines that the attenuation amount of the ultrasonic wave is larger than a predetermined value, the CPU 52 drives the moving mechanism 64 so that the distal end portion of the insertion tube 62 faces the opening portion 26a. Further, the CPU 52 controls the air supply device 66 to be driven to blow air from the insertion tube 62 to the opening 26a.

  Here, the air pressure from the insertion pipe 62 needs to be set to a pressure higher than the pressure due to the exhaust gas. In the present embodiment, air is blown at an air pressure of 20 to 30 kPa against exhaust gas having a flow rate of 5 m / s. In addition, after the air is blown, the CPU 52 obtains the attenuation amount of the ultrasonic wave with the distal end portion of the insertion tube 62 facing the opening portion 26a as it is.

  Then, the CPU 52 determines whether or not the attenuation amount of the ultrasonic wave is larger than a predetermined value, and when it is determined that the attenuation amount is larger than the predetermined value, the air is again returned from the insertion tube 62 to the opening 26a. Spray. If the CPU 52 does not determine that the attenuation is greater than the predetermined value, the moving mechanism 64 is driven to retract the distal end portion of the insertion tube 62. Thus, the CPU 52 corresponds to an ejection control unit.

  With this configuration, when condensed water adheres to the ultrasonic transmitter 20 and the ultrasonic receiver 22 and the reliability of the measurement value of the wind speed decreases, air is introduced from the insertion tube 62 to the opening 26a. Spray to blow away condensed water. Thereby, it becomes possible to reduce the dew condensation water near the ultrasonic transmitter and the ultrasonic receiver, and as a result, the instrument measurement error can be reduced, and the measurement accuracy of the Karman vortex is improved. It is possible to obtain a reliable measurement value of the wind speed.

  When the insertion pipe 62 is kept in the pipe 130, the insertion pipe 62 may be rotated 180 ° so that the exhaust gas does not enter the distal end portion of the insertion pipe 62.

  Further, by applying a water repellent to the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22, the dew condensation water becomes slippery on the water repellent layer 30 (see FIG. 4), so that the dew condensation is more efficiently performed. It becomes possible to blow off water.

  In addition, according to 2nd Embodiment mentioned above, although the insertion pipe 62 is installed in the moving direction downstream of waste gas with respect to the attachment position of the wind speed measuring apparatus 1 in the piping 130, it is not restricted to it, and the piping 130 The wind speed measuring device 1 may be installed on the upstream side in the exhaust gas movement direction. Thereby, since air can be blown to the opening 26a along the flow of the exhaust gas, it is possible to efficiently blow off the condensed water near the ultrasonic transmitter and the ultrasonic receiver. However, in this case, the flow of the exhaust gas is disturbed by the insertion pipe 62 on the upstream side of the ultrasonic transmitter 20 and the ultrasonic receiver 22, so that the ultrasonic transmitter 20 and the ultrasonic receiver 22 accurately Wind speed may not be measured. For this reason, after blowing air from the insertion tube 62 to the opening 26a, the insertion tube 62 is retracted out of the pipe 130, and the insertion tube 62 causes the exhaust gas flow upstream of the ultrasonic transmitter 20 and the ultrasonic receiver 22 to flow. It is necessary not to disturb.

  Further, according to the second embodiment described above, the movement mechanism 64 and the air supply device 66 are controlled by using the CPU 52 of the wind speed measuring device 1, but not limited thereto, the CPU is provided in the air purge set 60. The CPU may control the moving mechanism 64 and the air supply device 66. That is, the wind speed measuring device 1 and the air supply device 66 are electrically connected via the external terminal 56, and the measurement data of the wind speed in the wind speed measuring device 1 is transmitted to the air purge set 60. The CPU of the air purge set 60 Based on the measurement data from the measurement device 1, it may be determined whether to move the moving mechanism 64 and the air supply device 66. In this case, the air purge set 60 can be used as an externally attached option with respect to the wind speed measuring apparatus 1, and the air purge set 60 can be used in other places.

  Further, according to the second embodiment described above, when the CPU 52 does not determine that the attenuation amount of the ultrasonic wave is larger than the predetermined value, the air is automatically blown. Air may be automatically sprayed periodically, and an operation panel may be provided in the air purge set 60 so that air can be sprayed by an operator manually operating the operation panel. .

[Third Embodiment]
FIG. 10 is an explanatory diagram showing a schematic configuration of a wind speed measuring apparatus according to a third embodiment of the present invention, and FIG. 11 is a block diagram showing an electrical configuration of the wind speed measuring apparatus according to the third embodiment. In addition, in the wind speed measuring apparatus of 3rd Embodiment shown to FIG. 10, FIG. 11, the member same as the member in the wind speed measuring apparatus of 1st Embodiment shown in FIGS. 2-7, or the member of the same function is the same. The detailed description was abbreviate | omitted.

  The wind speed measuring apparatus 1 of the third embodiment shown in FIGS. 10 and 11 is further compared to the wind speed measuring apparatus 1 of the first embodiment shown in FIGS. A detector 72 and a pipe temperature detector 74 are provided.

  The heater 70 is disposed in the vicinity of the wind speed detection unit 10 in the probe 14. The temperature detector 72 is installed in the casing 26 (see FIG. 3) of the wind speed detection unit 10 and detects the temperature of the wind speed detection unit 10, particularly the temperature near the ultrasonic transmitter 20 and the ultrasonic receiver 22. It is.

  The pipe temperature detector 74 is disposed in the vicinity of the wind speed measuring device 1 in the pipe 130 and detects the temperature in the pipe 130.

  Next, an electrical configuration will be described. As shown in FIG. 11, the control circuit 50 includes a CPU 52, a memory 54, and an external terminal 56. Further, the ultrasonic transmitter 20, the ultrasonic receiver 22, the heater 70, the temperature detector 72 and the pipe temperature detector 74 are connected to the control circuit 50.

  The CPU 52 controls the entire wind speed measuring device 1. In addition to the program for controlling the wind speed measuring device 1, the memory 54 stores a program for controlling power supply to the heater 70, a table for obtaining the dew point temperature from the temperature in the pipe 130, and the like.

  Next, control of the heater 70 will be described. The CPU 52 of the control circuit 50 obtains the dew point temperature based on the detection result of the pipe temperature detector 74, and stores a temperature slightly higher than the dew point temperature as a reference temperature in a predetermined area of the memory 54. Next, the CPU 52 turns on / off the power supply to the heater 70 based on the detection result of the temperature detector 72, and executes feedback control so that the temperature of the wind speed detection unit 10 does not fall below the reference temperature. Thus, the CPU 52 corresponds to a heating control unit.

  In the third embodiment, since no condensation occurs in the wind speed detection unit 10, a water repellent agent is applied to the surfaces of the ultrasonic transmitter 20 and the ultrasonic receiver 22, and the water repellent layer 30 (FIG. 4). The operation of forming the reference) can be omitted.

  According to the third embodiment configured as described above, by controlling the heater 70, the temperature of the probe 14 and the wind speed detection unit 10 can be made higher than the dew point temperature in the pipe 130. It is possible to more reliably prevent the condensed water from adhering to the sonic transmitter 20 and the ultrasonic receiver 22.

DESCRIPTION OF SYMBOLS 1 Wind speed measuring apparatus 10 Wind speed detection part 12 Conversion part 14 Probe 16 Fixing part 20 Ultrasonic transmitter 22 Ultrasonic receiver 24 Eddy generator 26 Case 26a Opening part 30 Water-repellent layer 50 Control circuit 52 CPU
54 Memory 56 External Terminal 60 Air Purge Set 62 Insertion Pipe 64 Moving Mechanism 66 Air Supply Device 70 Heater 72 Temperature Detector 74 In-Pipe Temperature Detector 100 Reactor Facility 102 Reactor 104, 106, 116, 130 Piping 110 Turbine Building 112 Turbine 114 Condenser 120, 122 Filter 132 Mounting portion 150 Exhaust tube

Claims (5)

A vortex generator for generating Karman vortices in the fluid flowing in the pipe, an ultrasonic transmitter disposed on the downstream side of the vortex generator, and the vortex generator at a predetermined interval from the ultrasonic transmitter. And an ultrasonic receiver disposed opposite to each other, and based on a reception signal of the ultrasonic receiver, the number of the Karman vortices passed between the ultrasonic transmitter and the ultrasonic receiver is determined. When the wind speed measuring device that counts and measures the speed of the fluid from the count number of the Karman vortex is installed in the pipe,
The ultrasonic transmitter and the ultrasonic receiver are inclined with respect to the vertical direction, and the ultrasonic transmitter and the ultrasonic receiver are opposed to each other at right angles to the moving direction of the fluid flowing in the pipe. An installation method of a wind speed measuring device characterized in that:   The wind speed measuring device installation method according to claim 1, wherein a water repellent agent is applied to the ultrasonic transmitter and the periphery thereof, and the ultrasonic receiver and the periphery thereof. A vortex generator that generates Karman vortices in the fluid flowing in the pipe;
An ultrasonic transmitter disposed downstream of the vortex generator;
An ultrasonic receiver disposed opposite to the ultrasonic transmitter at a predetermined interval;
Based on the reception signal of the ultrasonic receiver, the number of the Karman vortices that have passed between the ultrasonic transmitter and the ultrasonic receiver is counted, and the velocity of the fluid is determined from the number of the Karman vortices. A flow rate measuring means for measuring;
Air ejection means for ejecting air toward the ultrasonic transmitter and the ultrasonic receiver;
And determining whether or not condensation has occurred in the ultrasonic transmitter and the ultrasonic receiver based on the ultrasonic receiver, and when it is determined that condensation has occurred, an ejection control unit that drives the air ejection unit is provided. A wind speed measuring device characterized by that.   The wind speed measuring device according to claim 3, wherein a water repellent agent is applied to the ultrasonic transmitter and its periphery, and the ultrasonic receiver and its periphery. A vortex generator that generates Karman vortices in the fluid flowing in the pipe;
An ultrasonic transmitter disposed downstream of the vortex generator;
An ultrasonic receiver disposed opposite to the ultrasonic transmitter at a predetermined interval;
Based on the reception signal of the ultrasonic receiver, the number of the Karman vortices that have passed between the ultrasonic transmitter and the ultrasonic receiver is counted, and the flow velocity of the fluid is calculated from the number of the Karman vortices. A flow rate measuring means for measuring;
Heating means for heating the ultrasonic transmitter and the ultrasonic receiver;
And a heating control means for determining a dew point temperature in the pipe and driving the heating means so that the temperatures of the ultrasonic transmitter and the ultrasonic receiver are higher than the dew point temperature. Wind speed measuring device.

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