JPH0576566B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to air exhaust inlets of air conditioning equipment such as air conditioning equipment, supply and exhaust equipment, etc. located in buildings such as office buildings, stores, and factories. This relates to a device that measures the flow rate of air flowing in and out from an air port.

[Conventional technology and problems]

Buildings such as office buildings, stores, and factories are designed to maintain an appropriate living environment inside the building. Air conditioning equipment such as air conditioning equipment and air supply/exhaust equipment is installed to control air flow within a reasonable range. In general, in order to secure a wide floor space, the air exhaust inlet of this air conditioner is often installed on the ceiling, and the temperature-controlled air is delivered to the ceiling by a blow-out nozzle, as shown in Figure 3. It is spread along the entire room so that it is spread evenly throughout the room.

Nowadays, energy saving is strongly positioned as an important theme in the industrial world, and naturally there is a strong desire to reduce the energy consumption of air conditioning equipment. This energy saving of air conditioning equipment can be achieved by supplying an appropriate air flow rate that matches the heat load and demand under conditions such as temperature and humidity.

Conventionally, the method for measuring air flow rate has been to provide a hole for measuring the flow velocity in a part of the duct connected to the air exhaust inlet, insert a measuring instrument (such as an anemometer) into the part, and measure the air flowing through the part. There is a method of measuring the flow rate by taking into account the cross-sectional area of the passage. However, when using this method, a straight section (space) approximately 6 times the duct diameter or more is required in front of the anemometer, and accurate flow measurement cannot be achieved unless a rectifying grid is provided over the entire surface of the anemometer. There were limitations such as difficulty, and there were problems with accuracy. Also, regarding the measurement points,
It is necessary to provide at least 10 points each in the X direction and Y direction of the duct, and even if such a measurement method is possible to accurately measure the air flow, it is difficult to use in existing air conditioning duct systems. It was inappropriate for practical use.

Furthermore, there is a method in which a wind speed measurement device consisting of one or several wind speed sensors is brought close to an air exhaust inlet of an air conditioner to measure the flow velocity of air discharged from the air outlet. However, with this method, the flat area of the anemometer's directional characteristics is narrow, the air passage area cannot be determined accurately, and the distribution of air flow is not uniform, so the measurement points are more likely to cause variations in measured values. occurs,
It is easy to include errors and it is not possible to accurately measure the amount of air blown.

In view of the problems of the prior art as described above, the inventors of the present invention have conducted various systematic experiments and theoretical analyzes in order to solve the problems. The present invention was developed by focusing on guiding the flow to the measuring section while making the flow velocity and direction as uniform as possible.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact air flow rate measuring device that can accurately and quickly measure the flow rate of air flowing in and out of an air outlet (air exhaust inlet) of an air conditioner or the like.

[Structure of the invention]

The air flow rate measurement device (hereinafter simply referred to as flow rate measurement device) at the air port of an air conditioner, etc. of the present invention includes:
A measurement unit that measures the flow velocity of air flowing in and out from the air outlet (air exhaust inlet) of an air conditioner, an acquisition unit that acquires the signal output from the measurement unit, and arithmetic processing of the signal output from the acquisition unit. A flow measuring device comprising a calculation unit, the measuring body having no outer frame and arranged to form a continuous flow of air to be measured flowing in and out from an air exhaust inlet of an air conditioner, etc. a duct provided within the duct, a space having a predetermined volume formed near the air-introducing end of the duct, and a space on the downstream side of the space in the direction of flow of the air to be measured; a flow direction adjusting means disposed substantially perpendicularly to the flow in the duct for changing or adjusting the direction of the flow of the air to be measured; and a flow direction adjusting means arranged substantially perpendicularly to the flow in the duct downstream of the flow direction adjusting means. The measurement unit includes a sensor support provided therein and a plurality of sensors placed at predetermined locations within the sensor support to detect the flow velocity of the air to be measured, and the flow direction adjusting means is configured to It has a conical or pyramid-shaped backflow prevention core with the top facing upstream of the flow, which is disposed between the measuring air introduction end and the measuring section, and approximately in the center of the duct. The device is designed to prevent backflow of air in the vicinity thereof, and the acquisition section acquires flow velocity signals from each sensor of the measurement main body, and the calculation section calculates the average flow velocity based on the signals from the acquisition section. The present invention is characterized in that the flow rate is calculated from the flow path area in the duct by calculating .

Hereinafter, the configuration of the present invention will be explained in more detail.

FIG. 1 is a perspective view showing the overall configuration of the flow rate measuring device of the present invention, and FIG. 2 is a partial sectional view of the device.

As shown in FIGS. 1 and 2, the measurement main body 7 in the present invention is used to measure the flow velocity of air flowing in and out from the air discharge inlet of an air conditioner, etc., and includes the duct 2, the space 22, the flow direction It is composed of an adjusting means 3 and a measuring section 1.

The duct 2 forms the outer frame of the measurement body, and has an upper bottom made of metal, plastics, ceramics, etc., which is arranged to form a continuous flow of air to be measured flowing in and out from the air exhaust inlet of an air conditioner, etc. It is an open empty fuselage.

The duct 2 supports the measuring section 1 and further supports the flow direction adjusting means 3 as required.

In addition, when the duct 2 is moved to the air exhaust inlet 61 of an air conditioner (not shown) to measure the flow rate of air, the duct 2 is designed to introduce air flowing in and out from the section without leaking into the duct 2. 2 flange surface 2
It is preferable to attach the sealing material 25 to 4.

Next, the space section 22 is a space having a predetermined volume, which is formed in the duct near the end of the duct where the air to be measured is introduced.

This space 22 is provided to reduce the speed of the air flowing in from the measured air introduction end 21 of the duct 2, reduce the deflection of the air flow, and reduce ventilation resistance. , to make the flow velocity distribution uniform in the measuring section 1 and its vicinity.

Next, the flow direction adjusting means 3 is disposed on the downstream side of the space 22 in the duct 2 in the direction of the flow of the air to be measured, and is disposed substantially perpendicular to the flow in the duct. To change or adjust the orientation of

The air flowing in from the measurement target air introduction end 21 of the duct 2 does not necessarily have a uniform inflow speed on a plane that includes the introduction end 21, that is, the air inflow surface, and the direction of the flow also varies. In order to accurately measure the air flow rate, it is important to make the flow velocity and direction of the air as uniform as possible before guiding it to the measuring section.

This flow direction adjusting means 3 is provided inside the duct 2 and upstream of the measuring section 1, and has the function of adjusting the flow direction of the air flowing into the section.
It has a function of preventing backflow of the introduced air in the duct 2, a function of making the flow velocity distribution in the and/or duct 2 uniform, etc.

In particular, in the present invention, as illustrated in FIG. It is a conical or pyramid-shaped core with the apex 37 facing upstream of the flow of the air to be measured, and is disposed approximately at the center of the duct 2 between the duct 2, the measuring section 1, and its vicinity. prevent backflow of air.

Next, as shown in FIGS. 1 and 2, the measuring section 1 includes a sensor support disposed downstream of the flow direction adjusting means 3 substantially at right angles to the flow of the air to be measured in the duct 2. 12 and a plurality of sensors 11 arranged at predetermined locations within the sensor support 12 to detect the flow velocity of the air to be measured. Accurately detect the flow velocity of

The sensor 11 constituting this measurement unit 1 detects that when an air conditioner is controlling the room temperature, the room temperature setting value of the air conditioner varies depending on the outside temperature or the season, and therefore the temperature of the air discharged from the air exhaust inlet also changes. Therefore, it is preferable to use a flow rate sensor whose output is not affected by air temperature, indoor temperature, etc.

In addition, in the measuring section 1, sensors 1 are installed at multiple locations.
Since the sensor 11 is arranged to detect the flow velocity at the same time, it is preferable that the sensor 11 itself has a structure that does not cause ventilation resistance.

The acquisition unit 4 in the present invention is connected to each sensor 11 of the measurement unit 1 of the measurement main body 7, and acquires signals output from each sensor.

The calculation unit 5 in the present invention is connected to the acquisition unit 4, calculates the average flow velocity based on the signal from the acquisition unit, calculates the flow rate from the flow path area in the duct 2, and discharges air from air conditioning equipment, etc. The flow rate of air flowing in and out from the inlet 61 is calculated.

Here, using the flow rate measuring device of the present invention, which consists of the measurement body 7 consisting of the measurement section 1, the duct 2, and the flow direction adjustment means 3, the acquisition section 4, and the calculation section 5,
A method for measuring the flow rate at the air vents of air conditioning equipment, etc. will be briefly described. First, measurement section 1,
The duct 2 containing the flow direction adjustment means 3 and, in some cases, the measurement body 7 containing a support for supporting them are moved to the air discharge inlet 61 of the air conditioning equipment,
The opening of the duct 2 is positioned so as to include the air exhaust inlet 61, and preferably the flange portion 22 and the like on the side of the air introduction end 21 to be measured of the duct 2 are brought into close contact with the ceiling or the like via a sealing material. Next, detect the flow velocity of the air introduced into the duct 2 and passing through the measurement part 1,
Through the acquisition section 4, the calculation section 5 calculates and processes the airflow by considering the airflow passage area, etc., and derives the flow rate of air discharged and inputted from the air opening of the air conditioner or the like.

[Operation and effects of the invention]

The flow measuring device of the present invention can accurately and quickly measure the flow rate of air flowing in and out from an air exhaust inlet of an air conditioner or the like. Further, this measuring device is lightweight, compact, and easy to carry, and can perform measurements easily.

That is, first, in a space having an appropriate volume provided between the end of the duct for introducing the air to be measured and the measurement part, the speed of the air flowing into the space is reduced, the deflection of the air flow is reduced, and Reduce ventilation resistance. Next, the direction of the air flow is changed and adjusted by the flow direction adjusting means provided upstream of the measuring section to equalize the flow velocity and flow direction of the air. At this time, in the present invention, by particularly arranging the backflow prevention core 31 as a flow direction adjustment means, it is possible to prevent the backflow of air flowing into the duct 2 at the measurement part and its vicinity, and the actual blowout air volume and measurement Since the difference in air volume can be reduced, it is possible to accurately measure the air flow rate.

Note that if the backflow prevention core 31 is not provided, backflow may occur in the center of the duct 2, as illustrated in FIG. 4, and furthermore, backflow may occur at or near the measurement section 1. This is highly possible, and in order to accurately measure the air flow rate, it is necessary to proactively arrange the backflow prevention core 31. Next, since the flow velocity of the air, which is equalized in the flow velocity distribution and the direction of flow, is detected by the measuring section, the flow rate of the air flowing in and out from the air discharge inlet can be accurately measured. In addition, the air flow rate detected by the measurement unit is collected in the acquisition unit, and the collected output signal is calculated and processed in the calculation unit, thereby making it possible to quickly measure the air flow rate. At this time, several sensors of the measuring section are arranged, and the flow rate is calculated by averaging the detected values of the flow velocity obtained from the plurality of sensors, so that more accurate flow rate measurement can be performed.

[Description of implementation]

In carrying out the present invention, the following embodiments may be adopted.

The first aspect of the present invention will be explained below using FIG. 7.

In the first aspect of the present invention, a backflow prevention core 31 and a guide vane 32 are provided as the flow direction adjustment means 3, and the guide vane 32 is connected to the measurement target air introduction end 21 of the duct 2 and the measurement part 1. It consists of a plurality of vanes 35 disposed between them and having an appropriate angle with respect to the air flow, and changes the direction of the incoming air flow so that the flow velocity of the air to be measured is uniform in the measurement part. adjust. In addition, the guide vane 32
is located between the air exhaust inlet 61 and the measurement unit 1, and the angle of the vane 35 is adjusted to match the flow direction of the air exhaust inlet 61 and the flow direction expected by the measurement unit 1, and the flow velocity of the air to be measured is adjusted. is determined so that it is uniform in the measurement unit 1.

In the first aspect, by adopting the above-mentioned configuration, the guide vane 32 is further provided, so that the flow direction of the air passing through this part can be changed and adjusted to prevent the occurrence of backflow in the measurement part and its vicinity. Furthermore, since it is possible to make the air flow velocity distribution uniform in the measuring section and its vicinity, it is possible to realize more accurate air flow rate measurement.

The second aspect of the present invention will be explained below using FIG. 8.

In the second aspect of the present invention, a backflow prevention core 31 and a flow regulating member 33 are provided as the flow direction adjusting means 3. There is a net-like body disposed between the two, and the air is adjusted by passing the air through the net-like body so that the flow velocity of the air to be measured becomes uniform. This means that when the air to be measured passes through the net-like body, if the flow velocity is partially high in the net-like body or the vicinity thereof, the air to be measured passes through the part where the ventilation resistance is lower in relation to the ventilation resistance. This is because the flow rate becomes uniform as a result.

By adopting the above-mentioned configuration, the present second aspect has the following features:
Since the flow regulator 33 is further provided, by adjusting the flow velocity and direction of the air passing through this part, the flow velocity distribution of the air in the measuring part 1 and its vicinity can be made uniform, It is possible to measure the air flow rate more accurately.

In addition, in this second embodiment, by bringing the top portion 37 of the backflow prevention core 31 as close as possible to the plane containing the measured air introduction end 21 of the duct 2, the air flow can be further made smoother. The flow velocity distribution in the measuring section 1 and its vicinity can be made more uniform.

Below, the third aspect of the present invention will be explained using the tenth aspect.

In a third aspect of the present invention, the backflow prevention core 31 and the rectifying grid 34 described in the first aspect are arranged as the flow direction adjusting means 3, and the rectifying grid 34 is arranged substantially parallel to the measuring section 1. and a rectifying grid having a plurality of rectangular parallelepiped or cube-shaped compartments having openings in the air passage direction of the section 1, wherein the flow is approximately at the center of the internal space within the plurality of compartments in the grid 34. The sensor section 11 includes at least a part of the sensor section 11 on the downstream side of the sensor section 1, and the flow of the air to be measured is rectified so that its direction is approximately parallel to the detection direction of the measurement section 1.

By adopting the above-mentioned configuration, the present third aspect has the following features:
Since the rectifying grid 34 is further provided, the flow direction of the air passing through this part can be made to be approximately parallel to the detection direction of the measuring part 1, so changes in the output value due to variations in the air flow direction can be suppressed. Therefore, measurement errors can be prevented and more accurate air flow rate measurement can be achieved.

The fourth aspect of the present invention will be explained below using FIGS. 14 to 16.

A fourth aspect of the present invention uses a small thermoelectric current meter as the sensor 11 of the measuring section 1, and the sensor consists of a U-shaped support 14 and a sensor insertion socket 15 fixed to the support. It has a hood body supported by the sensor support 12 and covering the thermocouple, its hot and cold contacts, and the heating wire, with the hood body forming an air passage, and extending at right angles to the longitudinal direction of the hood body. A heating wire is provided, so that even if there is some deviation in the approach angle of the air introduced into the measuring section 1, the hood body guides the flow of the air to be measured, so that it can flow out from the air exhaust inlet 61. The flow rate of incoming air can be measured accurately.

〔Example〕

Examples of the present invention and the embodiments of the invention described above will be described below.

Example 1 Hereinafter, the flow rate measuring device of the present invention will be explained using FIGS. 5 and 6.

This embodiment is an embodiment in which air discharged from an air discharge inlet 61 of an air conditioner (not shown) is measured, and the flow rate measurement device includes a measurement main body 7, an acquisition section (not shown), and a calculation section. (not shown), and the measurement main body 7 includes a measurement section 1 , a duct 2 , and a backflow prevention core 31 as a flow direction adjustment means 3 .

The measurement unit 1 includes a flow rate sensor 11 and a sensor support 1
2 and a signal output line 16. The sensor support 12 consists of a U-shaped support 14 and a socket 15 fixed to the support 14, and the flow rate sensor 11 is inserted into the socket 15 to form the measuring section 1. The U-shaped supports 14 are arranged in a grid pattern, and their ends are fixed to the inner wall surface of the duct 2.
Note that 20 flow rate sensors were used. In addition, the measuring section 1
was installed 200 mm downstream from the measurement target air introduction end 21 of the duct 2.

The duct 2 is a square hollow body made of rectangular parallelepiped aluminum with an open top and bottom, and the diameter of the opening is 600 mm.
×600mm. This duct 2 is provided with a sealing material 25 on the flange surface 24 of the duct 2 in order to prevent the air to be measured from leaking between the air to be measured introduction end 21 and the ceiling 63.

The flow direction adjustment means 3 connects the apex 37 to the air discharge inlet 6
It consists of a pyramid-shaped backflow prevention core 31 facing one side. This backflow prevention core 31 is made of synthetic resin, and is fixed and supported by the U-shaped support 14 of the measuring section 1 so that the bottom surface is located approximately in the center of the duct 2. The size of each side was set to 1/2.

As described above, the flow rate measuring device according to the first embodiment of the present invention has the backflow prevention core 31 disposed as described above, so that backflow of air flowing into the duct 2 at the measuring section 1 and its vicinity is prevented. This can be prevented and the flow rate measurement can be made more accurate.

Note that the top of the backflow prevention core 31 is connected to the air exhaust inlet 6.
By bringing the value even closer to 1, the air flow can be made smoother, and more accurate flow rate measurement becomes possible.

Embodiment 2 Hereinafter, a flow rate measuring device according to the first aspect of the present invention will be described with reference to FIG. 7, focusing on the differences from the above-described embodiment 1.

The flow measuring device in this embodiment has a measuring main body 7
, an acquisition section (not shown), and a calculation section (not shown)
The measurement main body 7 is composed of a measurement section 1, a duct 2, a backflow prevention core 31 as a flow direction adjustment means 3, and a guide vane 32, and is the same as in the first embodiment with the guide vane 32 added.

The measuring section 1, duct 2, and backflow prevention core 31 were configured in the same manner as in Example 1.

The guide vane 32 is provided at a position 80 mm downstream from the measured air introduction end 21 of the duct 2 in the direction of air flow, and consists of a vane 35. Three vanes from each end are fixed to the duct 2 in a louver shape, and three vanes from the other end are arranged in a louver shape to the innermost vane of the vanes fixed to the duct 2. The distance between the vanes is 50 mm, and the angle of inclination of the vanes is 25 degrees toward the center of the shaft. Further, the guide vane 32 has its end fixed to the inner wall of the duct 2.

As described above, in the flow rate measuring device according to the second embodiment of the present invention, since the backflow prevention core 31 and the guide vane 32 are provided as the flow direction adjusting means 3 as described above, the air to be measured is introduced into the end of the duct 2. The air flowing into the duct from 21 is first decelerated in the space 22 to reduce the deflection of the flow, and the guide vane 32 changes and adjusts the direction of the air flow passing through this part.
Together with the backflow prevention core 31, it is possible to prevent the backflow of air in the measurement section 1 and its vicinity,
Since the air flow velocity distribution in the measuring section and its vicinity can be made uniform, more accurate flow rate measurement can be performed compared to the first embodiment.

In addition, by adjusting the angle of the vane 35 to a more suitable angle between 15 and 50 degrees depending on the position in the duct, the direction and velocity of the air flow can be adjusted more appropriately. The effects of the second embodiment can be further achieved.

Example 3 Hereinafter, a flow rate measuring device according to the second aspect of the present invention will be explained using FIG. 8 and FIG.
I will mainly explain the differences between the two.

The flow measuring device in this embodiment has a measuring main body 7
, an acquisition section (not shown), and a calculation section (not shown)
The measuring body 7 is composed of a measuring section 1, a duct 2, a backflow prevention core 31 as a flow direction adjusting means 3, and a rectifier 33, which is the same as in the first embodiment, with the rectifier 33 added.

The measuring section 1, duct 2, and backflow prevention core 31 were configured in the same manner as in Example 1.

The flow regulator 33 is located at a position 100 mm downstream from the measured air introduction end 21 of the duct 2 in the air flow direction.
and 100mm upstream from measurement section 1 in the direction of air flow.
It is a brass mesh body with a mesh size of 60 mesh. Further, the end portion of the fluid regulator 33 is fixed to the inner wall of the duct 2.

As described above, in the flow rate measuring device according to the third embodiment of the present invention, the backflow prevention core 31 and the flow rectifier 33 are provided as the flow direction adjustment means 3 as described above. The air flowing into the duct from 21 is first decelerated in the space 22 to reduce the deflection of the flow, and the flow regulator 33 decelerates the air passing through this part to adjust the flow. This prevents the occurrence of backflow and makes the flow velocity distribution uniform in the measuring section 1 and its vicinity, so that more accurate flow rate measurement can be performed than in the first embodiment.

In this embodiment, the top 37 of the backflow prevention core 31 is shaped to be slightly closer to the downstream side in the fluid flow direction than the surface of the duct 2 that includes the air introduction end 21 to be measured, as shown in FIG. The flow regulator 33 was adapted to the shape of the backflow prevention core 31 and had a hole in the center. In addition, by configuring the inner hole end of the flow regulator 33 and the slope part of the backflow prevention core 31 to be in top contact with each other, the air flow can be made even smoother, and the effect of the third embodiment can be further enhanced. It can be played effectively.

Embodiment 4 Hereinafter, a flow measuring device according to the third aspect of the present invention will be explained with reference to FIGS. 10 and 11, focusing on the differences from Embodiment 1 described above.

The flow measuring device in this embodiment has a measuring main body 7
, an acquisition section (not shown), and a calculation section (not shown)
The measuring body 7 is composed of a measuring section 1, a duct 2, a backflow prevention core 31 serving as a flow direction adjusting means 3, and a rectifying grid 34, and is the same as in the first embodiment with a rectifying grid 34 added thereto.

The duct 2 and the backflow prevention core 31 were constructed in the same manner as in Example 1.

The rectifying grid 34 is disposed at a position 150 mm downstream in the air flow direction from the measurement target air introduction end 21 of the duct 2, and has length and width of 50 mm, as shown in FIG.
It is a cube-shaped stainless steel grid (plate thickness: 0.5 mm) with a length of 50 mm and a plurality of compartments with openings in the direction of air flow, that is, in the axial direction. This rectifying grid 34 has its end fixed to the inner wall of the duct 2.

Further, a sensor support 12 is fixed on the downstream side of the flow in the internal space in the plurality of section chambers in the rectifying grid, and the sensor 11 is mounted on the support 12 at 18
pcs are included. The detection direction of this sensor 11 and the opening direction of the rectifier grid 34 for air passage substantially match.

As described above, in the flow rate measuring device according to the fourth embodiment of the present invention, the backflow prevention core 31 and the rectifying grid 34 are provided as the flow direction adjustment means 3 as described above.
The air flowing into the duct from the measured air introduction end 21 of the duct 2 is decelerated in the space 22 to reduce the deflection of the flow, and the backflow prevention core 31
In addition, the flow direction of the air passing through the rectifying grid 34 is adjusted at the final portion including the measurement section 1 so that it becomes approximately parallel to the detection direction of the measurement section 1. Furthermore, since the flow velocity distribution in the measuring section and its vicinity can be made uniform, more accurate flow rate measurement can be performed compared to the first embodiment.

Note that by bringing the top portion 37 of the backflow prevention core 31 closer to the air discharge inlet 61, the air flow can be made even smoother, and the effects of the fourth embodiment can be further exhibited.

Embodiment 5 A flow measuring device according to all of the first to third aspects of the present invention will be described below with reference to FIGS. 12 to 22, focusing on the differences from the first embodiment described above.

This embodiment is an embodiment in which air discharged from an air discharge inlet 61 of an air conditioner (not shown) is measured, and the flow rate measurement device includes a measurement main body 7 and an acquisition unit 4.
The measurement main body 7 is composed of the measurement section 1 , the duct 2 , a backflow prevention core 31 as the flow direction adjustment means 3 , a guide vane 32 , a flow regulator 33 , and a flow regulation grid 34 .

The measurement unit 1 includes a flow rate sensor 11 and a sensor support 1
2, and a signal output line 16. The sensor support 12 consists of a U-shaped support 14 and a socket 15 fixed to the support 14, and the flow rate sensor 11 is inserted into the socket 15 to constitute the measuring section 1.
The U-shaped support 14 is provided at a position 250 mm downstream in the air flow direction from the measured air introduction end 21 of the duct 2, and the length and width of the grid are 50 mm and the length is 70 mm.
It is fixed to the downstream end in the air flow direction of a rectifying grid 34 that has a plurality of compartments having openings in the air flow direction. The flow rate sensor 11 is
A small thermoelectric anemometer was used. As shown in FIGS. 14 to 16, the flow rate sensor 11 includes a thermocouple 1
10, a hood body 1 that covers the high temperature junction 111 and low temperature junction 112 of the thermocouple 110, and the heating wire 113
14, and the hood body 114 has a heating wire 11
An air passage 115 is formed that extends through the air passage 115 in a direction transverse to the air passage 3. Note that 116 is the entrance of the air passage. As shown in FIG. 17, 24 flow rate sensors 11 are evenly provided.

Inside the square duct 2, there is a space 100 mm downstream in the air flow direction from the measured air introduction end 21 of the duct 2.
A guide vane 32 is provided at the position of the vane 3.
The axial length of vane 5 is 50 mm, and the inclination angle of vane 35 is 30 degrees toward the center with respect to the axis. Further, the end of the guide vane 32 is fixed to the inner wall of the duct 2.

A flow regulator 33 made of wire mesh (40 mesh) is installed between the guide vane 32 and the measuring section 1.

The backflow prevention core 31 was shaped like a pyramid so that air could be smoothly guided to the measuring section, and the sides of the bottom were each half the length of the opening surface of the duct.

In addition, a duct 2 including a measuring section 1 and a flow direction adjusting means 3
is supported by a support body 8 to constitute a measurement body 7, and the measurement body 7 is connected to an air exhaust inlet 61 of an air conditioner.
Move and measure. The output of the air flow velocity measured by the sensor 11 of the measurement section 1 is collected by the acquisition section 4, and is calculated and processed by the calculation section 5 to display the air flow rate.

Using this flow rate measurement device, the blowout shape was 585mm.
The flow rate of air discharged from a square air discharge inlet measuring 285 mm x 285 mm and a round air discharge inlet measuring 525 mm in diameter was measured using the experimental apparatus shown in FIG. The results are shown in FIG. In the figure, A shows the actual flow rate of the discharged air, B shows the flow rate measurement value in the case of a rectangular discharge inlet, and C shows the flow rate measurement value in the case of the round discharge inlet.

For comparison, a flow measuring device having the same configuration as the above-mentioned flow rate measuring device was used, except that it did not have the flow direction adjusting means 3 other than the rectifying grid 34, and the distance between the measurement target air introduction end of the duct 2 and the rectifying grid was 100 mm. Flow rate measurements were carried out for the case of a rectangular discharge inlet using a comparative device. The results are shown in FIG. In the figure, D shows the flow rate of the actually discharged air, and E shows the flow rate measured by the comparison device.

As is clear from FIGS. 19 and 20, it can be seen that the flow rate measuring device of this example is more accurate in flow rate measurement than the comparative device.

Next, the distance (l) between the guide vane 32 and the measured air introduction end 21 of the duct 2 was changed, and a flow rate measurement experiment was conducted for the case of a rectangular discharge inlet. The results are shown in FIG. In the figure, F is the actual flow rate of air discharged, G is the flow rate measurement value when l = 0, H is the flow rate measurement value when l = 50 mm, I is l
The flow rate measurements when = 100mm are shown. From this, it can be seen that more accurate measurement can be achieved by preferably setting l to about 50 mm or more.

Furthermore, the increase in ventilation resistance when a flow rate measuring device was attached to the fluid discharge inlet 61 was measured. The results are shown in FIG. In the figure, J indicates the relationship between the air flow rate and the pressure in the static tank when no measuring device is attached, K indicates the relationship when l = 50 mm, and L indicates the relationship between l = 50 mm.
This is shown for 100mm.

Additionally, a sensor is attached to the tip of the backflow prevention core 31 to measure the temperature and humidity of the air, and the output value detected by the sensor is input to the calculation unit and compared with the air flow rate and the indoor temperature and humidity. By doing so, it becomes possible to control the indoor environment even more precisely. In this case, a wind speed sensor that can simultaneously measure temperature and humidity may be used.

Example 6 FIG. 23 shows a type of flow rate measuring device having a backflow prevention core 31, a guide vane 32, and a rectifying grid 34 as the flow direction adjusting means 3. This device is
By employing the above-described configuration, more accurate air flow rate measurement can be performed than in the second embodiment or the fourth embodiment.

Note that by arranging the guide vanes 32 in two layers, it is possible to measure the air flow rate more accurately than in the case of one layer.

Further, as shown in FIG. 24, the guide vane 32
By making the shape of the vane 35 arcuate, the direction of air flow can be gently changed and adjusted.

Embodiment 7 FIG. 25 illustrates a flow rate measurement method using a flow rate measurement device in which the size of the opening of the duct 2 is smaller than the size of the air discharge inlet 61. In this case, the flow rate can be easily measured by attaching the adapter 26 between the measurement target air introduction end 21 of the duct 2 and the ceiling at or near the air exhaust inlet 61.

Example 8 FIG. 26 shows an example of a method for measuring the intake flow rate when indoor air is taken in from the air exhaust inlet 61. When measuring the suction flow rate, it is possible to measure by configuring a dedicated measuring device, but when using a device for measuring the discharge flow rate, an adapter duct 2 is installed between the downstream end 27 of the duct 2 and the ceiling.
8, the air flow rate can be measured relatively easily.

[Brief explanation of drawings]

Fig. 1 is a partially transparent perspective view of the flow rate measuring device of the present invention, Fig. 2 is a sectional view of the inside of the duct shown in Fig. 1, and Fig. 3 shows the flow direction of air discharged from the air discharge inlet of the air conditioner. An explanatory diagram, FIG. 4 is an explanatory diagram showing the direction of the flow of air flowing into the duct, and FIGS. 5 and 6 are diagrams showing a flow rate measuring device according to the first embodiment of the present invention, and FIG. 5 is one of them. FIG. 6 is a perspective view of the measuring section thereof, FIG. 7 is a partial cross-sectional view of a flow rate measuring device according to the second embodiment of the present invention, and FIGS. 8 and 9 are flow rate measurement devices according to the third embodiment of the present invention. 8 is a partial cross-sectional view of the device, FIG. 9 is a partial cross-sectional view of a developed example thereof, and FIGS. 10 and 11 are views showing a fourth embodiment of the present invention.
FIG. 10 is a partial sectional view of the flow rate measuring device, FIG. 11 is a perspective view of the measuring section, and FIG.
2 to 22 are views showing a flow rate measuring device according to a fifth embodiment of the present invention, in which FIG. 12 is a perspective view showing the entire device, FIG. 13 is a partial sectional view thereof, and FIG. 15 is a partially transparent perspective view showing the sensor, FIG. 16 is a perspective view of the thermocouple part of the sensor, FIG. 17 is a diagram showing the arrangement of the sensor, and FIG. 18 is a flow rate experimental device. Figure 19 is a diagram showing the flow rate measurement test results, Figure 20 is a diagram showing the flow rate measurement comparison test results, and Figure 21 is a flow rate measurement comparison test result when the guide vane position is changed. FIG. 22 is a diagram showing the ventilation resistance measurement results, FIGS. 23 and 24 are diagrams showing a flow rate measuring device according to the sixth embodiment of the present invention, and FIG. 23 is a partial sectional view thereof, and FIG. FIG. 24 is a partially cutaway sectional view of a developed example, FIG. 25 is a partially sectional view of a flow rate measuring device according to the seventh embodiment of the present invention, and FIG. 26 is a partially sectional view of a flow rate measuring device according to the eighth embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1...Measurement part, 2...Duct, 3...Flow direction adjustment means, 4...Acquisition part, 5...Calculation part, 7...Measurement main body, 11...Sensor, 12...Sensor support body,
22...Space part, 31...Backflow prevention core, 32...
...Guide vane, 33...Rectifier, 34...Rectifier grid, 61...Air discharge inlet.

Claims (1)

[Scope of Claims] 1. A measuring body that measures the flow velocity of air flowing in and out from an air outlet of an air conditioner, etc., an acquisition unit that acquires a signal output from the measurement body, and a signal output from the acquisition unit. A flow rate measuring device consisting of a calculation unit that performs calculation processing, the measurement body forming an outer frame of the measurement body and configured to form a continuous flow of air to be measured flowing in and out from an air port of an air conditioner or the like. a space formed in the duct near the air to be measured end of the duct and having a predetermined volume; and a space on the downstream side of the space in the direction of flow of the air to be measured. a flow direction adjusting means arranged substantially perpendicularly to the flow in the duct for changing or adjusting the direction of the flow of the air to be measured; and a flow direction adjusting means arranged substantially perpendicularly to the flow in the duct downstream of the flow direction adjusting means. The measurement unit includes a sensor support provided therein and a plurality of sensors provided at predetermined locations within the sensor support to detect the flow velocity of the air to be measured, and the flow direction adjustment means is configured to A conical or pyramidal backflow prevention core is disposed between the measuring air introduction end and the measuring section, and approximately in the center of the duct, and the top thereof faces upstream of the flow. The device is designed to prevent backflow of air in the vicinity thereof, and the acquisition section acquires flow velocity signals from each sensor of the measurement main body, and the calculation section calculates the average flow velocity based on the signals from the acquisition section. An air flow measuring device at an air port of an air conditioner, etc., characterized in that the air flow rate is calculated from the flow path area in the duct by calculating. 2. The flow direction adjustment means is disposed between the measurement target air introduction end of the duct and the measurement unit, has a vane having an appropriate angle with respect to the air flow, and has a vane that is arranged at an appropriate angle with respect to the air flow so that the flow velocity of the measurement target air is adjusted at the measurement unit. An air flow measuring device at an air port of an air conditioner or the like according to claim 1, characterized in that the device comprises a guide vane that adjusts the air flow to be uniform. 3. The flow direction adjustment means further includes a net-like flow regulator between the measurement target air introduction end of the duct and the measuring section, and makes the flow distribution uniform by passing the air through the mesh-like flow regulator. An air flow measuring device at an air port of an air conditioner or the like according to claim 1. 4. The flow direction adjusting means has a rectifying grid having a plurality of rectangular parallelepiped or cubic compartments having openings in the air passage direction and approximately parallel to the measuring section, and rectifies the flow of the air to be measured. 2. The air flow rate measuring device at an air port of an air conditioner or the like according to claim 1, wherein the direction of the measuring portion is substantially parallel to the detection direction of the measuring section. 5. The sensor support of the measuring section consists of a U-shaped support and a sensor insertion socket fixed to the support, and the U-shaped support controls the flow of the internal space in the plurality of compartments in the rectifying grid. An air flow measuring device at an air port of an air conditioner or the like according to claim 4, wherein the device is fixed to a downstream end. 6. The sensor support of the measuring section consists of a U-shaped support and a sensor insertion socket fixed to the support, and the U-shaped support is arranged in parallel or in a grid pattern, and its ends are connected to the duct. An air flow measuring device at an air port of an air conditioner or the like according to claim 1, wherein the device is fixed to an inner wall surface. 7. The sensor of the measurement part is a small thermoelectric current meter, and the current meter has a hood body that covers a thermocouple, a high-temperature contact and a low-temperature contact of the thermocouple, and a heating wire,
An air flow rate at an air port of an air conditioner or the like according to claim 6, wherein an air passage is formed from the hood body, and a heating wire is disposed at right angles to the longitudinal direction of the hood body. measuring device.