JP6498541B2 - measuring device - Google Patents

Description

  The present invention relates to a measuring device for measuring air volume and ventilation resistance.

  Conventionally, a measuring apparatus for measuring an air volume is known. For example, as disclosed in Patent Document 1, it is widely known that an air volume is measured from a temperature difference before and after blowing by using a temperature sensing element (thermal sensor) due to cooling by blowing.

  In order to measure the air volume, it is also known to measure the air volume using a pressure sensor. For example, as disclosed in Patent Document 2, a nozzle for generating a differential pressure of air is provided between a first chamber and a second chamber, and air between the first chamber and the second chamber is provided. The air volume can also be measured based on the differential pressure and the nozzle opening area.

JP 2004-309202 A JP 2005-207832 A

  And as it exists in patent document 1, when measuring an air volume using a temperature sensing element (thermal sensor), although a measuring apparatus can be reduced in size, only an air volume can be measured, Ventilation resistance against air volume could not be measured.

  Further, as disclosed in Patent Document 2, when measuring the air volume using a pressure sensor, the air volume and ventilation resistance can be measured, but the predetermined chamber size, nozzle opening area, etc. Can measure only the air volume within the range corresponding to the above, and devices that flow wind such as servers such as information base stations, power supply devices, measuring instruments, ventilation fans, air curtains, exhaust ducts, compressors and fans (hereinafter referred to as “wind flow devices”) It was difficult to measure the air volume and ventilation resistance in various ranges that were blown from, and the versatility was poor.

  For example, a nozzle having a large opening area is necessary when the air volume is large, and a nozzle having a small opening area is necessary when the air volume is small. This is because if a nozzle with a small opening area is used when the air volume is large, an optimum pressure difference cannot be obtained due to the vortex of the air flow returned from the nozzle, and if a nozzle with a large opening area is used when the air volume is small This is because the pressure difference between the chambers becomes a slight value, and the accuracy of measurement of the air volume and the ventilation resistance is remarkably lowered.

  Furthermore, the relationship between the size of the chamber and the position of the opening provided in the nozzle also affects the range of air volume that can be measured, and the predetermined size of the chamber and the opening provided in the nozzle. Only the air volume and ventilation resistance corresponding to the position of the part could be measured.

  The objective of this invention is invented in view of the said situation, and provides a highly versatile measuring apparatus corresponding to the air volume of various ranges as a measuring apparatus which measures an air volume and ventilation resistance.

In order to solve the above problems, a measuring apparatus according to the present invention is a measuring apparatus that includes a casing in which a ventilation passage having an intake port for taking in air blown from the outside is formed, and measures an air volume and ventilation resistance. In the ventilation path, a rectifying grid for rectifying air taken in from the intake port, a first chamber for taking in the air that has passed through the rectifying grid, and air taken in by the first chamber can pass through An opening plate in which an opening is formed, a second chamber for taking in air that has passed through the opening of the opening plate, a first pressure of air from the inlet to the rectifying grid, and the first A pressure sensor for measuring a second pressure of air in the chamber and a third pressure of air in the second chamber, and the casing is provided with the opening plate. To enable recombinant, the specific opening side of the air passage is opened is formed, characterized in that the specific opening with an openable and closable opening and closing unit.
Thereby, since the side surface of the ventilation path can be opened by the opening and closing unit and can be changed to various types of opening plates, the versatility of the measuring device for measuring the air volume and the ventilation resistance can be enhanced. Furthermore, when the size of the chamber is used as a reference, the opening area of the opening plate and the position of the opening corresponding to the size of the chamber can be determined, so that the size of the chamber is not increased more than necessary. In addition, the measuring device can be downsized.

Further, in the measuring apparatus according to the present invention, the casing is made of a resin material, the casing is connected to the pressure sensor, and the control board that calculates the air volume and the ventilation resistance is calculated by the control board. And a display unit for displaying the air volume and the ventilation resistance.
As a result, the weight of the casing is reduced, and the control board and the display unit are attached to the measuring device, so the functions related to measurement, calculation, and display are combined into one, and the lightweight measuring device is carried around. It is possible to measure the air volume and ventilation resistance of the airflow device in various places.

  Further, the measuring apparatus according to the present invention calculates an air volume on the control board based on a differential pressure between the second pressure and the third pressure measured by the pressure sensor, and calculates the calculated air volume. And ventilation resistance based on the first pressure measured by the pressure sensor.

Moreover, the measuring apparatus according to the present invention is characterized in that an auxiliary fan for sending the air in the ventilation path to the outside is provided at the outlet of the ventilation path opposite to the intake.
With this auxiliary fan, it is possible to prevent the air volume of the air blown from the wind flow device to be measured from decreasing due to unintended loads such as the shape of the ventilation path itself, and to maintain an appropriate air volume suitable for measurement Can do. For this reason, more accurate air volume and ventilation resistance can be measured.

  ADVANTAGE OF THE INVENTION According to this invention, the highly versatile measuring apparatus corresponding to the air volume of various ranges can be provided as a measuring apparatus which measures an air volume and ventilation resistance.

It is a figure which shows an example of the perspective view which looked at the measuring apparatus 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 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 of this invention. It is a figure which shows an example of the perspective view of the aperture plate in the measuring apparatus of this invention. It is a figure which shows an example of the display content displayed on the display part of the measuring apparatus of this invention. It is a figure which shows an example of the usage method of the measuring apparatus of this invention.

Embodiments according to the present invention will be described below.
FIG. 1 is a diagram showing an example of a perspective view of the measuring device 1 of the present invention as viewed from the first direction, and FIG. 2 shows the second measuring device 1 of the present invention in a second direction different from the first direction. It is a figure which shows an example of the perspective view seen from the direction.

  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 the ventilation resistance is attached to the upper surface of the casing 10.

  As shown in FIG. 1, the first side surface from the first direction in the casing 10 has a relay board 6 on which a first pressure sensor 5 a and a second pressure sensor 5 b for measuring air pressure are mounted. A first valve 7a and a second valve 7b that perform adjustment to send out air to the first pressure sensor 5a, a distributor 8 that distributes air to 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 made possible to select the air flow from the first opening 10a when measuring the air volume and ventilation resistance 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. 6) 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.

  As shown in FIG. 2, the second side surface of the casing 10 from the second direction is opposed to the side surface of the opening plate 16 so that the later-described opening plate 16 (see FIGS. 3 and 4) can be replaced. On the facing surface, a specific opening 10 f is formed by opening the side surface of the ventilation path 4.

  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.

  FIG. 3 shows a state in which a part of the casing 10 is removed in a state in which 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 from the measuring apparatus 1. It is a figure which shows an example of the cross-section explanatory drawing of the measuring apparatus.

  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.

  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 from the inlet 2 to the rectifying grid 14, and is formed so that the pressure of the 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.

  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 the power supply, a control board 22 that calculates the air volume and ventilation resistance, and controls the auxiliary fan 18 to be driven. And a display unit 23 for displaying the air volume, ventilation resistance 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.

  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.

  Further, the control board 22 is configured to calculate the air volume and the ventilation resistance according to the measurement values measured from the first pressure sensor 5a and the second pressure sensor 5b, and to drive the auxiliary fan 18.

  FIG. 5 is a diagram illustrating an example of display contents displayed on the display unit 23 of the measurement apparatus 1.

  As shown in FIG. 5, the display unit 23 is configured to display the air volume (AIR FLOW) and ventilation resistance (STATIC PRESSURE) values, and at least the identification number of the aperture plate 16 (NOZZLE). Has been.

  Thus, the outline | summary of the control until an air volume and ventilation resistance are displayed on the display part 23 is demonstrated below.

  First, the second pressure sensor 5b is a differential pressure between the air pressure in the first chamber 15 via the second opening 10b and the air pressure in the second chamber 17 via the third opening 10c. And the measured differential pressure is output to the control board 22 as a second differential pressure value.

  The control board 22 receives the second differential pressure value from the second pressure sensor 5b, so that the control board 22 is blown from the wind flow device to be measured based on the input second differential pressure value, the opening area of the opening plate 16, and the like. Calculate the air volume.

  Further, the first pressure sensor 5a is configured such that the pressure of the air before passing through the rectifying grid 14 via the first opening 10a and the atmospheric pressure of the outside air via the first outside air port 11a or the second outside air port 11b. The differential pressure (static pressure) is measured, and the measured differential pressure is output to the control board 22 as a first differential pressure value (static pressure value).

  The control board 22 receives the first differential pressure value from the first pressure sensor 5a, so that the control board 22 is blown from the measurement target airflow device based on the input first differential pressure value and the calculated airflow value. Calculate the draft resistance of the air.

  Next, the control board 22 outputs a display signal corresponding to the calculated air volume and ventilation resistance values on the display unit 23 in order to display the calculated air volume and ventilation resistance on the display unit 23.

  Thereby, as shown in FIG. 5, the air volume and the value of the ventilation resistance corresponding to the display signal input from the control board 22 are displayed on the display unit 23.

  FIG. 6 is a diagram illustrating an example of a method of using the measuring device 1 when measuring the air volume and ventilation resistance 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. 6, 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 ventilation resistance is completed by the control board 22, the values of the air volume and the ventilation resistance 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.

  In the present embodiment, the first pressure sensor 5a and the second pressure sensor 5b are configured by two differential pressure sensors, but a pressure sensor for measuring atmospheric pressure without using the differential pressure sensor, Pressure sensor for measuring the static pressure of the first opening 10a, pressure sensor for measuring the static pressure of the second opening 10b, and pressure for measuring the static pressure of the third opening 10c You may comprise with four pressure sensors with a sensor.

  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, the ventilation resistance, 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 resistance 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.

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 Controller 21 Power supply unit 22 Control board 23 Display unit

Claims (8)

A measuring device that measures the air volume and ventilation resistance of a wind flow device to be measured,
A housing constituting an air passage having an intake port for taking in air and a delivery port for sending out the taken air;
An opening member installed in the ventilation path and formed with an opening through which air taken from the intake port can pass;
A pressure sensor for measuring the pressure of air before and after passing through the opening member in the ventilation path;
An opening member replacement mechanism for forming a part of the ventilation path when the opening member is installed and enabling the opening member to be replaced;
A measuring device. In claim 1,
The opening member replacement mechanism is formed by opening a part of the ventilation path, and includes a specific opening for making the opening member replaceable, and an opening / closing member for opening and closing the specific opening. ,measuring device. In claim 1 or 2,
Further, the air volume and the ventilation resistance are calculated using measured values of the pressure of the air before and after passing through the opening member, connected to the pressure sensor, and the calculated air volume and ventilation resistance are displayed on the display unit. A measuring apparatus comprising a control unit for displaying. In claim 3 ,
Furthermore, a rectifying grid for rectifying air taken from the intake port is provided,
The pressure sensor includes a first pressure of air from the intake to the rectifying grid, a second pressure of air before passing through the opening member, and a third pressure of air after passing through the opening member. Measuring pressure,
The controller calculates the air volume based on a differential pressure between the second pressure and the third pressure, and determines the ventilation resistance based on the calculated air volume and the value of the first pressure. Measuring device to calculate. In any one of Claims 1 thru | or 4,
Furthermore, the measuring apparatus provided with the auxiliary fan provided in the said sending-out port and sending out the air of the said ventilation path to the exterior. In any one of Claims 1 thru | or 5,
The measuring device, wherein the opening member is installed in the ventilation path so as to be movable in a longitudinal direction of the ventilation path. In any one of Claims 1 thru | or 6,
The measuring device, wherein the opening of the opening member is formed in the center of the opening member in a funnel-like shape. In claim 3,
Plural kinds of opening members are prepared, and identification information is given to each of the plural kinds of opening members,
The said control part is a measuring apparatus which further displays the said identification information of the said opening member used for the measurement on the said display part.

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