JP6570783B2 - measuring device - Google Patents

Description

  The present invention relates to a measurement device that measures, for example, an air volume and a static pressure, and a method for determining a correction value for correcting measurement errors of a plurality of sensors attached to the measurement device.

  Conventionally, it is known to measure an air volume using a pressure sensor. For example, Patent Document 1 provides a nozzle for generating a differential pressure of air between a first chamber and a second chamber, and a differential pressure of air between the first chamber and the second chamber. And an air volume measuring device that measures the air volume based on the opening area of the nozzle and the like.

JP 2005-207832 A

  By the way, with respect to general air volume measuring devices such as the air volume measuring device disclosed in Patent Document 1, the device scale tends to increase. In general, the size of various sensors attached to the air flow measuring device is also increased in order to increase measurement accuracy. Therefore, such an air flow measuring device has a low portability, a smaller device size (compact), and an excellent portability are desired.

  However, if the size of various sensors is reduced with the reduction in the size of the air flow measurement device, the measurement accuracy of the various sensors decreases, and the measurement error of each sensor alone has a large effect on the final air flow measurement results and static pressure measurement results. Will be given.

  The present invention has been made in view of such a situation, and a technique for preventing a decrease in measurement accuracy of various sensors that may occur when the various sensors are made compact with the downsizing of the air flow measuring device. It is to provide.

  In order to solve the above problems, a measuring device according to the present invention is a measuring device that measures the air volume and static pressure of a wind flow device to be measured, and uses a plurality of sensors and measurement data from the plurality of sensors to measure the wind flow. A control device for calculating the air volume and static pressure of the device. The control device determines whether there is an error in each of the measurement data from the plurality of sensors, determines a correction value for correcting the error, and stores it in the storage device.

  The measuring device according to the present invention is a measuring device for measuring the air volume and the static pressure of the air flow device to be measured, and uses the plurality of sensors and the measurement data from the plurality of sensors to measure the air volume and the static pressure of the air flow device. And a storage device that stores a correction value for correcting the measurement degree difference between the plurality of sensors. The processor reads a correction value corresponding to each of the plurality of sensors from the storage device, corrects the measurement data from the plurality of sensors using the correction value, and uses the corrected measurement data to flow the air volume of the airflow device. And the static pressure is calculated and output.

Further features of the present invention will become apparent from the description of the present specification and the accompanying drawings. The embodiments of the present invention can be achieved and realized by elements and combinations of various elements and the following detailed description and appended claims.
It should be understood that the description herein is merely exemplary and is not intended to limit the scope of the claims or the application of the invention in any way.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the measurement precision of the various sensors which may arise when trying to make various sensors compact with the compactness of an airflow measuring apparatus can be prevented.

It is a figure which shows an example of the perspective view which looked at the measuring apparatus by embodiment of this invention from the 1st direction. It is a figure which shows an example of the perspective view which looked at the measuring apparatus by embodiment of this invention from the 2nd direction. It is a figure which shows an example of the cross-sectional explanatory drawing of the measuring apparatus by embodiment of this invention. It is a figure which shows an example of the perspective view of the aperture plate in the measuring apparatus by embodiment of this invention. It is a figure which shows the internal hardware structural example of the control apparatus in the measuring device by embodiment of this invention. It is a flowchart for demonstrating the content of the sensor correction process performed in the measuring apparatus by embodiment of this invention. It is a figure which shows an example of the display content displayed on the display part of the measuring device by embodiment of this invention. It is a figure which shows an example of the usage method of the measuring apparatus by embodiment of this invention.

  Embodiment of this invention discloses about the function (sensor correction function) which correct | amends the measured value of various sensors in the measuring apparatus which measures an air volume and a static pressure. The sensor correction function operates when the measurement device is shipped or / and when the measurement device is maintained and inspected (including the case where the measurement error of each sensor is checked in accordance with a user instruction).

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, functionally identical elements may be denoted by the same numbers. The attached drawings show specific embodiments and implementation examples based on the principle of the present invention, but these are for understanding the present invention and are not intended to limit the present invention. Not used.

  This embodiment has been described in sufficient detail for those skilled in the art to practice the present invention, but other implementations and configurations are possible without departing from the scope and spirit of the technical idea of the present invention. It is necessary to understand that the configuration and structure can be changed and various elements can be replaced. Therefore, the following description should not be interpreted as being limited to this.

  Furthermore, as will be described later, the embodiment of the present invention may be implemented by software running on a general-purpose computer, or may be implemented by dedicated hardware or a combination of software and hardware.

  In the following description, correction processing in the embodiment of the present invention will be described using correction processing as a program as a subject (operation subject). However, processing determined by the program being executed by a processor (CPU) is performed by a memory and a communication port ( Since the communication control device is used, the description may be made with the processor as the subject. Part or all of the program may be realized by dedicated hardware, or may be modularized.

<Appearance of measuring device>
FIG. 1 is a perspective view showing an appearance example of a measuring apparatus 1 according to an embodiment of the present invention, with a protective cover 12 removed.

  The measuring apparatus 1 includes a casing 10 that forms a ventilation path 4 that communicates with an intake port 2 that takes in air blown from outside and an outlet port 3 that sends out the taken air to the outside.

  A control device 20 that performs control for measuring the air volume and static pressure is attached to the upper surface of the casing 10.

  As shown in FIG. 1, a first pressure sensor (static pressure measuring pressure sensor: hereinafter, “static pressure sensor”) for measuring the pressure of air is provided on a first side surface of the casing 10 from the first direction. 5a and a second pressure sensor (differential pressure measurement pressure sensor: hereinafter referred to as “differential pressure sensor”) 5b on which the relay board 6 is mounted, and the first pressure sensor 5a has air A first valve 7a and a second valve 7b that perform adjustment to send out the air, a distributor 8 that distributes air into two flow paths, and a plurality of tubes 9a to 9f are attached.

  The first pressure sensor 5a and the second pressure sensor 5b mounted on the relay board 6 are sensors for measuring the pressure of air, and are differential pressure sensors having two input ports. Specifically, in the first pressure sensor 5a and the second pressure sensor 5b, one (upper) input port constitutes a positive input port, and the other (lower) input port constitutes a negative input port. Yes.

  In the present embodiment, the first pressure sensor 5 a and the second pressure sensor 5 b are mounted on the relay board 6, but the first pressure sensor 5 a and the second pressure sensor 5 b are not provided without the relay board 6. May be directly attached to the casing 10.

  Here, on the first side surface of the casing 10, in order to measure the pressure of the air in the ventilation path 4, there are three of the first opening 10a, the second opening 10b, and the third opening 10c. A hole is formed (see FIGS. 1 and 3).

  One end of the first tube 9a is connected to the first opening 10a, and the distributor 8 is connected to the other end of the first tube 9a.

  The distributor 8 is connected to the first tube 9a, the second tube 9b, and the first valve 7a, and the air input through the first tube 9a is input to the second tube 9b and the first valve 7a. Distributing.

  The first valve 7a has three ports, a distributor 8 and a third tube 9c are connected to the two ports, and the remaining one port is a first outside air port for taking in outside air. 11a. Then, the first valve 7a rotates the cross-shaped adjusting unit to send out air from the first opening 10a input to the third tube 9c via the distributor 8 or the third tube 9c. It is possible to adjust whether the outside air input through the first outside air port 11a is sent to 9c.

  For example, as shown in FIG. 1, when the arrow of the adjustment part in the first valve 7a faces the relay substrate 6 side or the upper side, the first valve 7a passes through the first outside air port 11a to the third tube 9c. When the arrow of the adjusting portion in the first valve 7a is directed to the distributor 8 side or the upper side, the first valve 7a is supplied to the third tube 9c via the distributor 8. The air from one opening 10a is sent out.

  The third tube 9c connected to the first valve 7a is connected to the negative input port of the first pressure sensor 5a. For this reason, either the air from the 1st opening part 10a or the external air input via the 1st external air port 11a is input into the negative | minus input port of the 1st pressure sensor 5a.

  Similarly to the first valve 7a, the second valve 7b has three ports, the second tube 9b and the fourth tube 9d are connected to the two ports, and the remaining one port is A second outside air port 11b for taking in outside air is configured. And the 2nd valve | bulb 7b sends out the air from the 1st opening part 10a input via the 2nd tube 9b to the 4th tube 9d by rotating a cross-shaped adjustment part, or 4th. It is possible to adjust whether or not the outside air inputted through the second outside air port 11b is sent out to the tube 9d.

  For example, as shown in FIG. 1, when the arrow of the adjusting portion in the second valve 7b is directed to the distributor 8 side or the upper side, the second valve 7b is connected to the fourth tube 9d via the second tube 9b. When the air from the first opening 10a inputted in this way is sent out and the arrow of the adjusting part in the second valve 7b is directed to the relay substrate 6 side or the upper side, the second valve 7b is connected to the fourth tube 9d. 2 The outside air input through the outside air port 11b is sent out.

  The fourth tube 9d connected to the second valve 7b is connected to the positive input port of the first pressure sensor 5a. For this reason, either the air from the 1st opening part 10a or the external air input via the 2nd external air port 11b is input into the plus input port of the 1st pressure sensor 5a.

  Therefore, by adjusting the first valve 7a and the second valve 7b, (1) the air from the first opening 10a is input to the positive input port of the first pressure sensor 5a, and the first pressure sensor 5a A case where external air is input to the negative input port; and (2) external air is input to the positive input port of the first pressure sensor 5a, and the negative input port of the first pressure sensor 5a is input from the first opening 10a. The case in which air is input can be selected. Note that the same air pressure can be input to the positive input port and the negative input port of the first pressure sensor 5a by adjusting the first valve 7a and the second valve 7b. The controller 20 determines that an error has occurred.

  In this way, the first valve 7a and the second valve 7b are provided, and either the air from the first opening 10a or the outside air is input to the positive input port and the negative input port of the first pressure sensor 5a. It is possible to select the air flow from the first opening 10a when measuring the air flow and static pressure of the air flow device (when receiving air from the air flow device to be measured). This is to prevent the pressure from becoming lower than the pressure of the outside air (atmospheric pressure) and the static pressure of the air through the first opening 10a from becoming negative. That is, the measurement value measured by the first pressure sensor 5a, which is a differential pressure sensor, is set to a positive value.

  One end of the fifth tube 9e is connected to the second opening 10b, and a positive input port of the second pressure sensor 5b is connected to the other end of the fifth tube 9e. . One end of a sixth tube 9f is connected to the third opening 10c, and the negative input port of the second pressure sensor 5b is connected to the other end of the sixth tube 9f.

  Therefore, air from the second opening 10b is input to the positive input port of the second pressure sensor 5b, and air from the third opening 10c is input to the negative input port of the second pressure sensor 5b. Air will be input.

  In order to protect the relay board 6 on which the first pressure sensor 5a and the second pressure sensor 5b are mounted, the distributor 8, and the plurality of tubes 9a to 9f from the outside, the first of the casing 10 is protected. A protective cover 12 is attached to the side surface. In FIG. 1, the protective cover 12 is removed to show the relay board 6 and the like.

  The protective cover 12 is provided with a cross-shaped adjusting portion in the first valve 7a and the second valve 7b so that the first valve 7a and the second valve 7b can be adjusted even when the protective cover 12 is attached to the casing 10. As the larger opening, the first adjustment opening 12a and the second adjustment opening 12b are formed. The first adjustment opening 12a is formed on the surface of the protection cover 12 that faces the adjustment portion of the first valve 7a when the protection cover 12 is attached to the casing 10, and the second adjustment opening 12b is When the protective cover 12 is attached to the casing 10, it is formed on the surface of the protective cover 12 that faces the adjustment portion of the second valve 7b.

  Further, a flange 10d for locking a connection duct 30 (see FIG. 8) to be described later is formed on the outer peripheral surface of the casing 10 on the intake port 2 side, and the measuring device 1 is carried on the upper surface of the casing 10. A handle 10e is formed to facilitate this.

  In particular, in the present embodiment, the casing 10 is made of a resin material such as nylon, polyacetal, fluorine resin, ABS resin, polyethylene, polypropylene, polycarbonate, vinyl chloride resin, phenol resin, methacrylic resin, melamine resin, urea resin, and polyurethane. It is configured and weight reduction is achieved. Note that the casing 10 has a temperature in the handle 10e and the control device 20 in consideration of cooling by blowing air from the measurement target airflow device and heating by hot air (hot air) from the measurement target airflow device. In order not to transmit, it is desirable that the resin material has a low thermal conductivity.

  In this way, the casing 10 is made of a resin material to reduce the weight, and since the handle 10e is formed on the upper surface portion of the casing 10, the measuring apparatus 1 can be easily carried.

<Opening plate (nozzle) replacement mechanism>
FIG. 2 is a perspective view showing an appearance example of the measuring apparatus 1 according to the embodiment of the present invention from a direction different from that in FIG. 1, and is a diagram for explaining an exchange mechanism of the aperture plate (nozzle) 16. is there.

  As shown in FIG. 2, on the second side surface of the casing 10 from the second direction, an opening plate 16 (see FIGS. 3 and 4), which will be described later, can be replaced. A specific opening 10f that opens the side surface of the ventilation path 4 is formed on the facing surface that faces the side surface.

  The specific opening 10f is opened to a size that allows insertion and removal of the opening plate 16 through the ventilation path 4, and the specific opening 10f is openable and slidable in a direction perpendicular to the longitudinal direction of the ventilation path 4. A portion 13 is provided.

  The opening / closing part 13 includes a base 13a and a side plate 13b that closes and closes the opening of the specific opening 10f.

  A guide rail 13c that is movably engaged with a slider (not shown) provided inside the ventilation path 4 is provided on the back surface of the base 13a, and the opening / closing part 13 is configured to be slidable. .

  Further, the side plate 13 b is provided with a side plate handle portion 13 d for grasping the opening / closing portion 13 and the opening plate 16 standing on the ventilation path 4 when the specific opening 10 f is closed. A restricting portion 13e that restricts movement in the longitudinal direction side, and an open / close latching portion that latches with the main body latching portion 13f attached to the casing 10 in order to maintain the closed state of the specific opening 10f. 13g.

  Thereby, the specific opening 10f can be opened or closed by grasping the side plate handle 13d and sliding the opening / closing part 13. When the specific opening 10f is open, it can be replaced with the opening plate 16 corresponding to the air volume of the measurement target airflow device, so that the versatility corresponding to the airflow in various ranges can be enhanced. .

  In this embodiment, the opening / closing part 13 is configured to be slidable, but one end side of the opening / closing part 13 is pivotally supported by the casing 10 and the other end side of the opening / closing part 13 is configured to be openable. It may be configured to be openable and closable.

<Internal structure of measuring device>
FIG. 3 is a diagram showing an example of the internal structure of the measuring apparatus 1 according to the embodiment of the present invention. In FIG. 3, the measuring device when a part of the casing 10 is removed in a state where the relay substrate 6, the first valve 7 a, the second valve 7 b, the distributor 8, the plurality of tubes 9 a to 9 f and the protective cover 12 are removed. One cross-section is shown.

  As shown in FIG. 3, the ventilation path 4 has a rectifying grid 14 for rectifying air taken in from the intake port 2, a first chamber 15 for taking in air that has passed through the rectifying grid 14, and a first chamber. 15 is an opening plate 16 in which an opening through which air taken in is formed is formed; a second chamber 17 that takes in air that has passed through the opening of the opening plate 16; and air for sending out the air in the ventilation path 4 to the outside An auxiliary fan 18 is provided. The first chamber 15 and the second chamber 17 are not completely closed spaces, but are open spaces formed by partitioning the ventilation path 4 with the opening plate 16. Accordingly, the ventilation path in front of the opening plate 16 (intake 2 side) can also be called the first ventilation path section, and the ventilation path in the rear of the opening plate 16 (auxiliary fan 18 side) can be called the second ventilation path section. It is.

  Further, one standing holding portion 10 g for holding the state where the opening plate 16 is erected on the air passage 4 is formed inside the casing 10.

  The rectifying grid 14 is configured in a rectangular grid shape, and is used for rectifying the air blown from the wind flow device to be measured.

  The first chamber 15 forms a space from the rectifying grid 14 to the opening plate 16, and the second chamber 17 forms a space from the opening plate 16 to the auxiliary fan 18.

  The first opening 10 a described above is formed, for example, from the intake port 2 to the rectifying grid 14, and is formed so that the pressure of air before passing through the rectifying grid 14 can be measured. The second opening 10b is formed in the first chamber 15, and is formed so that the air pressure in the first chamber 15 can be measured. The third opening 10c is formed in the second chamber 17 so that the pressure of air in the second chamber 17 can be measured.

  The auxiliary fan 18 is provided on the outlet 3 side, and sends air in the ventilation path 4 blown from the measurement target airflow device to the outside in an auxiliary manner. The auxiliary fan 18 is made of a metal fan so as to be able to cope with a large amount of air blown from the wind flow device to be measured. In order to reduce the weight, the auxiliary fan 18 may be a resin fan.

  When the air blown from the wind flow device to be measured passes through the ventilation path 4 by the auxiliary fan 18, the intention (load loss due to the shape of the ventilation path 4 itself, the length of the ventilation path 4 in the longitudinal direction, etc.) It is possible to prevent a reduction in the air volume of the air blown from the measurement target wind flow device due to the load that is not performed, and it is possible to maintain an appropriate air volume suitable for measurement. In other words, by providing the auxiliary fan 18, the measuring device 1 is used as an axial blower corresponding to the measurement target airflow device, and the ventilation path 4 of the measurement device 1 is used as the ventilation of the measurement target airflow device. It can be constructed in a pseudo manner with a road. For this reason, more accurate air volume and static pressure can be measured.

  The aperture plate 16 is for intentionally generating a pressure difference between the air pressure in the first chamber 15 and the air pressure in the second chamber 17, and as shown in FIG. A differential pressure opening 16a whose opening is narrowed in a funnel shape is formed at substantially the center.

  In the present embodiment, the differential pressure opening 16a is shaped like a funnel in which the opening becomes narrower. However, as shown in FIG. 4B, the opening plate 16 is formed in a flat plate shape and is cylindrical. The differential pressure opening 16b may be formed substantially at the center.

  Furthermore, the position where the differential pressure openings 16a and 16b are formed may be biased to a position on one end side of the opening plate 16. The shapes and positions of the differential pressure openings 16a and 16b in the opening plate 16 are appropriately optimized according to the range of air flow to be measured and the sizes and shapes of the first chamber 15 and the second chamber 17, as appropriate. Can be adopted.

  Accordingly, when the sizes of the first chamber 15 and the second chamber 17 are used as a reference, the shapes and positions of the differential pressure openings 16a and 16b in the opening plate 16 corresponding to the sizes of the chambers. Therefore, the first chamber 15 and the second chamber 17 can be made compact without making the size of the chamber unnecessarily large, and the measurement apparatus can be miniaturized.

  Further, in the present embodiment, the differential pressure opening 16a is formed in a funnel-like shape so that the opening is narrowed, and the differential pressure opening 16a is formed at the approximate center of the aperture plate 16, so that the aperture plate 16 is used as a reference. Even in this case, the size of the first chamber 15 and the second chamber 17 can be suppressed to the minimum necessary size that can stably measure the air pressure in each chamber. 15 and the second chamber 17 can be made compact.

  Returning to FIG. 3 again, the control device 20 described above includes a power supply unit 21 that stores power, a control board 22 that calculates the air volume and static pressure, and controls the auxiliary fan 18 to be driven. A display unit 23 for displaying the air volume, static pressure, and the like. The control board 22 is connected to the first pressure sensor 5a, the second pressure sensor 5b, and the auxiliary fan 18, and to the power supply unit 21 and the display unit 23. Further, an atmospheric pressure sensor 206 (see FIG. 5) for measuring atmospheric pressure and a temperature / humidity sensor 207 (see FIG. 5) for measuring temperature and humidity are attached to the control board 22. Although a temperature / humidity sensor that measures both temperature and humidity is used here, a temperature sensor and a humidity sensor may be provided separately, and the temperature may be measured by the temperature sensor and the humidity by the humidity sensor.

  The power supply unit 21 is configured to store a power supply voltage from the outside and to be controlled by the control board 22 even when the measuring apparatus 1 is carried. The power supply unit 21 does not have a function of storing a power supply voltage from the outside, and includes a power supply plug. When power is supplied from the outside through the power supply plug, the power supply unit 21 supplies power to the control device 20 and the like. May be configured to supply power.

  Various operation buttons 24 such as a power button for inputting power, a measurement start button for starting measurement, and a setting button for setting the identification number of the attached aperture plate 16 are mounted on the control board 22. The measurement person can perform various operations.

  The control board 22 is based on the measurement values measured from the first pressure sensor (static pressure sensor) 5a and the second pressure sensor (differential pressure sensor) 5b, the measurement results of the atmospheric pressure sensor 206, and the temperature / humidity sensor 207. Thus, the air volume and the static pressure are calculated, and the auxiliary fan 18 is driven. The calculation of air volume and static pressure will be described later.

<Configuration of Control Device 20>
FIG. 5 is a diagram illustrating an internal configuration example of the control device 20 provided in the measurement device 1 according to the embodiment of the present invention. As one function, the control device 20 executes a process (sensor correction process) for correcting measurement errors of various sensors.

  The control device 20 includes a power supply unit 21, an input device 201 for inputting data, a memory 202 for storing a sensor correction processing program and information, and a sensor correction processing program and information read from the memory 202, and various types of input A CPU (processor) 203 that executes the program for sensor data (measurement data by various sensors), an output device 204 for outputting a result of the sensor correction process, and a correction value as a result of the sensor correction process are accumulated. A storage device 205 for storing, an atmospheric pressure sensor 206 for measuring the ambient atmospheric pressure, and a temperature / humidity sensor 207 for measuring the ambient temperature and humidity are provided.

  The input device 201 corresponds to, for example, a keyboard, a mouse, a touch panel, a reading device that reads data from a portable memory such as a USB memory or a memory card. The input device 201 has various operation buttons 24 such as a power button for inputting power, a measurement start button for starting measurement, and a setting button for setting the identification number of the attached aperture plate 16. Is included. Further, the input device 201 may be a communication device that receives data via a network.

  The memory 202 stores a sensor correction processing unit (sensor correction processing program) 2021 that executes correction processing on various sensor data (measurement data obtained by various sensors) input to the control device 20 as programs.

  The output device 204 corresponds to, for example, a display (display unit 23), a speaker, or the like. The storage device 205 corresponds to, for example, a flash memory, and includes a correction value storage area 2051 for storing correction values for measurement data of various sensors.

<Contents of sensor correction processing>
FIG. 6 is a flowchart for explaining the contents of the sensor correction process executed in the measurement apparatus 1 according to the embodiment of the present invention. The sensor correction process is executed at the stage of shipping the measuring apparatus 1 and / or the stage of maintenance and inspection of the measuring apparatus 1. Furthermore, the correction process may be executed when the user wants to appropriately correct the measurement errors of various sensors.

(I) Steps 101 and 102
When the control device 20 (CPU 203) detects that the main power supply of the measuring device 1 is turned on (step 101), the control device 20 is in the correction mode (the function for correcting the measurement error of the sensor is turned on). Whether or not) (step 102). If the correction mode is not set (No in step 102), the process proceeds to step 103. If the correction mode is set (Yes in step 102), the process proceeds to step 104. Whether or not the correction mode is set is determined by whether or not a correction switch (mechanical switch or software switch) provided in the measuring apparatus 1 is ON. In addition, a switch that can turn on / off the correction mode may be provided for each sensor so that the user can select a sensor that enables the correction mode.

(Ii) Step 103
The control device 20 operates the measurement device 1 in a normal measurement mode for measuring air volume and static pressure. Therefore, in this case, the correction process is not executed for various sensors. However, as described above, since the sensor correction process is executed at least once when the measurement apparatus 1 is shipped, correction values for the measurement values of various sensors are held in the correction value storage area 2051 of the storage device 205. ing. For this reason, the CPU 203 reads the correction values for the various sensors from the correction value storage area 2051 and reflects the correction values in the measurement values from the various sensors to calculate the air volume and static pressure.

(Iii) Step 104 and Step 111
The sensor correction processing unit 2021 repeats the processing from step 105 to step 110 for various sensors. That is, the processing from step 105 to step 110 is sequentially performed for each of the atmospheric pressure sensor, the temperature / humidity sensor, the differential pressure sensor, and the static pressure sensor.
(Iv) Step 105
The sensor correction processing unit 2021 operates the target sensor to perform measurement, and acquires a measurement value by the sensor.

(V) Step 106
The sensor correction processing unit 2021 outputs a measurement value obtained by the sensor to an output device (for example, a display unit of a display device) 204. This step is not indispensable for calculating the correction value of the measurement error of the sensor, but visual confirmation can be made by notifying the operator (including the user) of the measurement value before correction. To do.

(Vi) Step 107
The sensor correction processing unit 2021 determines whether or not the measurement value is correct. Whether or not it is “correct” means, for example, the measured value measured and inputted by a calibrated sensor or a calibrated measuring instrument (for example, barometer, thermometer, or hygrometer) and the measured value acquired in step 106 Is determined by comparing. If the measured value is correct (Yes in step 107), the process proceeds to step 108. If the measured value is not correct (No in step 107), the process proceeds to step 109. In addition to the case where the two measurement values are the same, the case where the difference between the two measurement values is equal to or less than a predetermined value may be determined as “correct”.

(Vii) Step 108
The sensor correction processing unit 2021 stores the correction value in the correction value storage area 2051 of the storage device 205. When the correction is not performed, a value “0” may be stored, or information for invalidating the correction for the sensor at the time of measuring the air volume / static pressure may be stored.

(Viii) Step 109
The sensor correction processing unit 2021 determines a correction value for the sensor. The correction value may be determined based on, for example, a difference value (error value) between the input correct measurement value and the measurement value of the sensor acquired in step 106, or indicates a correction value corresponding to the error value. A correction value table may be prepared in advance and a correction value corresponding to the error value may be acquired.

(Ix) Step 110
The sensor correction processing unit 2021 uses the correction value determined in step 109 to generate a corrected measurement value (for example, operate the sensor again to obtain a raw measurement value, and reflect the correction value on it). A corrected measurement value is generated) and displayed on the display screen of the display device as necessary. Then, the process proceeds to step 107, and it is determined again whether the corrected measurement value is correct.

  When a series of processes from step 107 to step 109 to step 110 is executed a predetermined number of times or more, the sensor correction processing unit 2021 determines that the sensor cannot be corrected, stops the sensor correction process, You may make it notify a user or an operator that correction | amendment is impossible. In this way, the user or operator can determine whether or not the sensor should be replaced.

  For example, even if the pressure sensor is corrected k times (k = 1, 2, 3,...), If the corrected measurement value does not become 0 Pascal, an error may be detected for the pressure sensor. Even if the temperature and humidity have large errors (even if the accuracy of the temperature sensor and humidity sensor is not good), the influence on the final measurement result of the air volume and static pressure is small. On the other hand, for atmospheric pressure, the effect of errors on the measurement results of air volume and static pressure is large. For this reason, it is not necessary to correct the temperature sensor and the humidity sensor so strictly (a margin for error can be increased), but it is necessary to correct the atmospheric pressure sensor correctly. Therefore, the reference for determining whether or not the measured value is correct for various sensors (step 107) may be changed.

(X) After completion of the sensor correction process When the correction process for all sensors or the selected sensor is executed, the sensor correction process is ended, the operation of the measuring apparatus 1 is stopped, and the above correction switch is automatically activated. Or turned off by an operator or user. Therefore, unless the correction switch is turned on, the next time the main power is turned on, the operation of the measuring apparatus 1 shifts to the normal air flow measurement mode.

<Example of displaying measurement results>
FIG. 7 is a diagram illustrating an example of display contents displayed on the display unit 23 (output device 204) of the measurement apparatus 1.

  As shown in FIG. 7, the display unit 23 is configured to display the value of air flow (AIR FLOW) and static pressure (STATIC PRESSURE), and at least the identification number of the aperture plate 16 (NOZZLE). Has been.

<Calculation of air volume and static pressure>
Hereinafter, processing contents until the air volume and the static pressure are displayed on the display unit 23 will be described.

  First, for example, after the auxiliary fan 18 is operated at a predetermined number of revolutions, the second pressure sensor (differential pressure sensor) 5b is configured so that the air pressure (air is opened in the first chamber 15 through the second opening 10b). The pressure difference between the pressure of air before passing through the plate 16 and the pressure of air in the second chamber 17 through the third opening 10c (the pressure of air after the air passes through the opening plate 16). The measured differential pressure is output to the control device 20 as a second differential pressure value.

  In addition, the first pressure sensor (static pressure sensor) 5a includes the pressure of air before passing through the rectifying grid 14 via the first opening 10a and the outside air via the first outside air port 11a or the second outside air port 11b. A differential pressure (static pressure) from the atmospheric pressure is measured, and the measured differential pressure is output to the control device 20 as a first differential pressure value (static pressure value). The rectifying grid 14 is not essential for calculating the air volume and the static pressure.

Then, the CPU 203 of the control device 20 calculates the air volume using the second differential pressure value (differential pressure value) from the second pressure sensor (differential pressure sensor) 5b. The air volume is calculated based on Equation 1 shown below.
Air volume = Flow coefficient x D x (Differential pressure value) ^1/2 ... (Formula 1)
Here, the flow coefficient is a constant set for each of the aperture plates (nozzles) 16 having different aperture sizes, and D represents the aperture diameter of the aperture plates (nozzles) 16.

  Subsequently, the static pressure is determined. Since the static pressure value varies depending on temperature, humidity, and atmospheric pressure, the static pressure value obtained by actual measurement must be converted.

The CPU 203 converts the measured static pressure value into a converted static pressure value using the following Equation 2.
Converted static pressure value = Conversion coefficient x Actual measured static pressure value (Equation 2)
Here, the conversion coefficient is a constant determined by ρs / ρ. ρs is determined by the air density at 1013.25 hPa, 20 ° C., 0% RH, and is 1.20478, for example. ρ is the air density of the humid air. That is, the conversion coefficient is a coefficient determined by the ratio of the air density and humid air at 1013.25 hPa, 20 ° C., and 0% RH.

  As described above, the control device 20 calculates the converted static pressure based on the first differential pressure value (actually measured static pressure value), the calculated airflow value, the actually measured temperature, the actually measured humidity, and the actually measured atmospheric pressure value. To do.

  Then, the CPU 203 of the control device 20 outputs a display signal corresponding to the calculated air volume and static pressure values on the display unit 23 in order to display the calculated air volume and static pressure on the display unit 23. The calculated air volume and static pressure are stored in the memory 202 or the storage device 205.

  As a result, as shown in FIG. 7, the air volume and the static pressure value corresponding to the display signal input from the control board 22 are displayed on the display unit 23.

<Usage example of measuring device>
FIG. 8 is a diagram illustrating an example of a method of using the measuring device 1 when calculating the ventilation resistance based on the measurement results of the air volume and static pressure of the wind flow device 50 that is the measurement target.

  As shown in FIG. 2, the measurer releases the engagement between the main body locking portion 13f and the opening / closing locking portion 13g, and slides the opening / closing portion 13 of the measuring apparatus 1 to open the side surface of the ventilation path 4. The opening plate 16 suitable for the air volume of the wind flow device 50 to be measured is erected on the air passage 4. Then, the opening / closing part 13 is slid to close the side surface of the ventilation path 4, and the main body locking part 13f and the opening / closing locking part 13g are locked.

  Next, as shown in FIG. 8, the connection duct 30 is attached to the air blowing port 51 of the wind flow device 50 to be measured and the flange 10 d of the measuring device 1.

  Then, in the control device 20, the power button is operated to input power, and the measurement start button is operated to start measurement. Thereafter, when the calculation of the air volume and the static pressure is completed by the control board 22, the values of the air volume and the static pressure are displayed on the display unit 23.

  As described above, according to the measuring apparatus 1 of the present embodiment, various types of aperture plates corresponding to the air volume of the wind flow device to be measured are obtained by sliding the opening / closing part 13 to open the side surface of the ventilation path 4. Since it can be changed to 16, the versatility corresponding to the air volume in various ranges can be enhanced.

<Modification>
In the present embodiment, the first pressure sensor (static pressure sensor) 5a and the second pressure sensor (differential pressure sensor) 5b are configured by two pressure sensors, but the first opening portion is not used without using the differential pressure sensor. 3 of a pressure sensor for measuring the static pressure of 10a, a pressure sensor for measuring the static pressure of the second opening 10b, and a pressure sensor for measuring the static pressure of the third opening 10c. One pressure sensor may be provided.

  Furthermore, in the present embodiment, the measuring device 1 is configured by attaching the control device 20 to the casing 10 and including the control device 20, but the measuring device 1 may be configured without the control device 20. For example, the control device 20 may be configured as an external control device such as a personal computer, and the measurement values measured by the first pressure sensor 5a and the second pressure sensor 5b may be input to the external control device.

  Furthermore, in the present embodiment, the control device 20 in the measurement device 1 is configured to include the display unit 23 that displays the air volume, static pressure, and the like, but the control device 20 in the measurement device 1 does not include the display unit 23. You may comprise. For example, the control device 20 is configured to be connectable to an external display device such as an external liquid crystal monitor, and the control device 20 outputs a display signal to the external display device. You may comprise so that the value of a pressure may be displayed.

  Furthermore, in the present embodiment, the opening plate 16 erected on the ventilation path 4 is fixed at one position on the ventilation path 4 by one standing holding part 10g and the restriction part 13e. It is configured. However, the plurality of standing holding portions 10g and the restriction portions 13e are provided so that the opening plate 16 can be fixed at a plurality of positions between the second opening portion 10b and the third opening portion 10c in the ventilation path 4. You may comprise. Thereby, the magnitude | size of the 1st chamber 15 and the 2nd chamber 17 can be changed, and the versatility corresponding to the air volume of various ranges can be improved more.

  Further, in the present embodiment, the opening plate 16 erected on the ventilation path 4 is restricted so that the opening plate 16 does not move to the longitudinal direction side of the ventilation path 4 by the standing holding part 10g and the restriction part 13e. ing. However, the opening plate 16 may be configured to be movable in the longitudinal direction of the ventilation path 4 between the second opening 10 b and the third opening 10 c of the ventilation path 4. In this case, after the opening plate 16 is moved to the longitudinal direction side of the air passage 4, a lock mechanism for fixing the opening plate 16 is provided so that the position of the opening plate 16 is not shifted by the air blow by the airflow device. desirable. For example, the upright holding part 10g and the restriction part 13e may be configured to be slidable in the longitudinal direction of the air passage 4, and a lock mechanism for fixing the upright holding part 10g and the restriction part 13e may be provided. . Also by this, the magnitude | size of the 1st chamber 15 and the 2nd chamber 17 can be changed, and the versatility corresponding to the air volume of an airflow apparatus can be improved more.

<Summary>
The present embodiment discloses a measuring device that measures the air volume and static pressure of a wind flow device to be measured. In the measurement device, the control device (processor) has errors in measurement data from a plurality of sensors (various sensors such as an atmospheric pressure sensor, a temperature sensor, a humidity sensor, a differential pressure sensor, and a static pressure sensor). If there is an error, a correction value for correcting the error is determined and stored in a storage device or memory. By doing so, it is possible to prevent a decrease in measurement accuracy of various sensors that may occur when the various sensors are made compact as the measuring apparatus is made compact.

  More specifically, the control device determines whether or not there is an error by comparing the input reference measurement data with measurement data from a plurality of sensors. Thus, since the objective reference value and the measurement data are compared, it is possible to accurately determine the presence or absence of an error. The control device may determine the correction value based on the error value, or may acquire the correction value from a correction table that stores the correction value.

  The measurement apparatus of the present embodiment is structurally installed in a ventilation path having an intake port for taking in air, a delivery port for sending out the taken-in air, and the ventilation path. An opening member formed with an opening through which the taken-in air can pass, a pressure sensor for measuring the air pressure before and after passage of the opening member in the ventilation path, and the ventilation path when the opening member is installed And an opening member replacement mechanism for enabling replacement of the opening member. By adopting a configuration in which the opening member (nozzle) can be exchanged in this way, the measuring apparatus can be made compact.

  Specifically, the opening member replacement mechanism is formed by opening a part of the ventilation path, a specific opening for enabling the opening member to be replaced, and an opening / closing member for opening and closing the specific opening, It is the composition which includes. Thus, since the mechanism for exchanging the opening member (nozzle) can be realized without adopting a complicated structure, the manufacturing cost of the measuring apparatus can be suppressed.

  Furthermore, the measuring apparatus according to the present embodiment includes a plurality of sensors, a control device (processor) that calculates the air volume and static pressure of the airflow device using measurement data from the plurality of sensors, and a measurement degree difference between the plurality of sensors. And a storage device that stores correction values for correction. When actually using the measuring apparatus, the processor reads correction values corresponding to each of the plurality of sensors from the storage device, and corrects measurement data from the plurality of sensors using the correction values. Then, the processor calculates and outputs the air volume and static pressure of the airflow device using the corrected measurement data. Since the air volume and static pressure are calculated after correcting the measured values of various sensors in this way, the reduction in measurement accuracy of various sensors that can occur when the various sensors are made compact along with the compactness of the measuring device is prevented. can do.

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2 Intake port 3 Outlet 4 Ventilation path 5a 1st pressure sensor 5b 2nd pressure sensor 6 Relay board 7a 1st valve 7b 2nd valve 8 Distributor 9a-9f Tube 10 Casing 10a 1st opening part 10b 1st opening part 10b 2nd opening 10c 3rd opening 10d Flange 10e Handle 10f Specific opening 10g Standing holding part 11a 1st outside air port 11b 2nd outside air port 12 Protective cover 13 Opening and closing part 14 Rectification grid 15 1st chamber 16 Opening plate 17 Second chamber 18 Auxiliary fan 20 Control device 21 Power supply unit 22 Control board 23 Display unit 201 Input device 202 Memory 2021 Sensor correction processing unit 203 CPU
204 Output device 205 Storage device 2051 Correction value storage area 206 Atmospheric pressure sensor 207 Temperature / humidity sensor

Claims (4)

A measuring device for measuring the air volume and static pressure of a wind flow device to be measured,
Multiple sensors,
A controller that calculates the air volume and static pressure of the airflow device using measurement data from the plurality of sensors, and
The control device is a measurement device that determines whether or not there is an error in each of measurement data from the plurality of sensors, determines a correction value for correcting the error, and stores the correction value in a storage device,
Furthermore, the measuring device comprises:
A casing in which a ventilation path having an intake port for taking in air blown from the airflow device is formed;
In the ventilation path,
A rectifying grid for rectifying the air taken from the intake;
A first chamber for taking in air that has passed through the rectifying grid;
An opening plate having an opening through which air taken in by the first chamber can pass;
A second chamber for taking in air that has passed through the opening of the aperture plate;
For measuring at least a first pressure of air from the inlet to the rectifying grid, a second pressure of air in the first chamber, and a third pressure of air in the second chamber; And a pressure sensor of
In the casing, in order to be able to replace the opening plate, a specific opening that opens a side surface of the ventilation path is formed,
An opening / closing part capable of opening and closing the specific opening;
The opening / closing part is
The base,
A side plate that closes and closes the opening of the specific opening;
A guide rail provided on the back surface of the base and movably engaged with a slider provided inside the ventilation path,
The measurement device further includes a duct that forms a second ventilation path between the measurement device and the airflow device. In claim 1,
The control device determines whether or not there is the error by comparing the input reference measurement data and measurement data from the plurality of sensors. In claim 2,
The control device determines the correction value based on the error value. A measuring device for measuring the air volume and static pressure of a wind flow device to be measured,
Multiple sensors,
A processor that calculates the air volume and static pressure of the airflow device using measurement data from the plurality of sensors;
A storage device for storing correction values for correcting measurement errors of the plurality of sensors,
The processor reads the correction value corresponding to each of the plurality of sensors from the storage device, corrects measurement data from the plurality of sensors using the correction value, and uses the corrected measurement data. A measuring device that calculates and outputs the air volume and static pressure of the airflow device,
Furthermore, the measuring device comprises:
A casing in which a ventilation path having an intake port for taking in air blown from the airflow device is formed;
In the ventilation path,
A rectifying grid for rectifying the air taken from the intake;
A first chamber for taking in air that has passed through the rectifying grid;
An opening plate having an opening through which air taken in by the first chamber can pass;
A second chamber for taking in air that has passed through the opening of the aperture plate;
For measuring at least a first pressure of air from the inlet to the rectifying grid, a second pressure of air in the first chamber, and a third pressure of air in the second chamber; And a pressure sensor of
In the casing, in order to be able to replace the opening plate, a specific opening that opens a side surface of the ventilation path is formed,
An opening / closing part capable of opening and closing the specific opening;
The opening / closing part is
The base,
A side plate that closes and closes the opening of the specific opening;
A guide rail provided on the back surface of the base and movably engaged with a slider provided inside the ventilation path,
The measurement device further includes a duct that forms a second ventilation path between the measurement device and the airflow device.

Images