JP2006194572A - Air capacity unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air capacity unit accurately controllable hardly influenced by turbulent air current in a duct, particularly drift, and swirling flow liable to occur in the case of a circular duct. <P>SOLUTION: A casing of the air capacity unit is provided therein with an air speed sensor for detecting the speed of air flow in a casing; an opening/closing blade for opening/closing the inside of the casing around a shaft; an opening/closing device for driving the opening/closing blade, and an air current straightening means upstream of the air speed sensor. The air current straightening means comprises an air current straightening body for straightening the swirling flow formed in the duct, temporarily in the axial direction of the casing, and a drift straightening body of doughnut shape for straightening the drift formed in the duct, and supplies the straightened air current to the downstream air speed sensor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air volume unit that detects a wind speed in a duct for air conditioning by a sensor, converts the detected value into a control signal, and performs operation control. In particular, even if the air flow in the duct is disturbed, It relates to an air volume unit that can be controlled.

  Conventional wind speed units mainly employ a propeller system or a thermistor system as a wind speed sensor for detecting the wind speed in the duct. The thermistor type wind speed sensor is highly accurate in detecting the wind speed and can accurately control the air volume unit. However, since the structure of the wind speed sensor is fine, it is difficult to impart impact resistance. On the other hand, since the propeller type wind speed sensor has a simple structure and is easy to manufacture, it is frequently used in an air volume unit (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 2-34931 (FIG. 3)

  The variable air volume device 32 described in Patent Document 1 is equipped with a propeller type air volume sensor 36, converts the wind speed detected by the air volume sensor 36 into a control signal for the damper, and a damper 37 so as to match the required air volume of the occupant. Is controlled. However, wind speed sensors can accurately detect the wind speed if the airflow is stable (not disturbed), but air conditioning ducts in general buildings such as office buildings vary depending on the structure of the building. In the case where the duct upstream of the air flow unit is composed of a large number of bent parts and branching parts, the air flow in the air conditioning duct is disturbed such as uneven flow, and a stable air flow passes through the air flow unit. There are many sites that are rare. Also, in the case of air conditioning ducts with a round cross-section, a swirl flow along the inner wall of the duct is likely to occur, a strong swirl flow along the inner wall of the duct, and almost no airflow at the axial center of the duct Thus, depending on the turning direction of the airflow, the wind speed sensor may not rotate at all, and the air volume unit cannot be controlled well, causing trouble.

  The problem to be solved by the present invention is an air volume unit capable of eliminating the influence of a swirling flow that is likely to occur when the air flow in the duct is disturbed, particularly when the cross-sectional shape is a circular duct, and capable of stable control. Is to provide.

  The air volume unit of the present invention includes a casing that is connected to an air conditioning duct and forms a flow path therein, an opening and closing blade that opens and closes the flow path in the casing, and a wind speed sensor upstream of the opening and closing blade, An air flow correcting means for temporarily correcting the turbulence of the air flow in the air conditioning duct and generating a corrected air flow area on the downstream side is provided at least on the upstream side of the wind speed sensor.

  The wind speed sensor may be provided on a projection surface of the airflow correction means when projected on the casing cross section.

  Moreover, the said airflow correction means is a shape which partitions the said casing cross section into a some area | region.

  Further, the wind speed sensor is arranged in one area of the casing cross section partitioned into a plurality of areas by the air flow correcting means.

Further, the airflow correction means is constituted by a thin plate.

  Further, the distance between the downstream end of the airflow correction means and the upstream end of the wind speed sensor is set within a range of 3 to 40 mm.

  The length of the airflow correction means in the casing axial direction is set in a range of 15 to 40% of the casing diameter.

  The airflow correction means further includes a drift correction body for correcting drift.

  Moreover, the said drift correction body consists of a throttle member which restrict | squeezes the cross-sectional area of a casing to 50 to 80%.

  The present invention has the following effects.

  The air volume unit of the present invention includes a casing that is connected to an air conditioning duct and forms a flow path therein, an opening and closing blade that opens and closes the flow path in the casing, and a wind speed sensor upstream of the opening and closing blade, Since the airflow correction means that temporarily corrects the turbulence of the airflow in the air conditioning duct and generates a corrected airflow area on the downstream side is provided at least on the upstream side of the wind speed sensor, the airflow in the duct has passed through the airflow correction means. Later, it will be temporarily corrected in the direction along the casing axial direction, and the corrected airflow will be reliably supplied to the wind speed sensor disposed downstream, so that the wind speed sensor can accurately detect the wind speed in the duct. Thus, the stable air volume unit can be controlled.

  Further, when the wind speed sensor is projected on the casing cross section, the wind speed sensor is disposed in the airflow correction area formed on the downstream side of the airflow correction means if provided on the projection surface of the airflow correction means. Since the airflow corrected by the airflow correction means is always supplied to the wind speed sensor, stable wind speed detection is possible.

  Moreover, if the said airflow correction means is made into the shape which partitions the said casing cross section into a some area | region, the stable correction airflow can be obtained for every zone, and the freedom degree of a wind speed sensor arrangement | positioning increases. Further, when the airflow correction means is fixed inside the casing, the airflow correction means is fixed at a plurality of locations inside the casing, so that not only the airflow correction means is structurally stable but also the effect of reinforcing the casing itself is obtained.

  If the wind speed sensor is arranged in one area of the casing cross section partitioned into a plurality of areas by the air flow correction means, it is difficult to be affected by the air current flowing in other areas in different states. Stable operation can be ensured.

  Further, if the airflow correction means is made of a thin plate, the airflow correction means can be easily processed and has a simple structure. Furthermore, pressure loss can be suppressed, and airflow in the duct can be corrected without impairing the original performance of the air volume unit.

  In addition, if the distance between the downstream end of the airflow correction means and the upstream end of the wind speed sensor is set within a range of 3 to 40 mm, the state where the wind speed sensor is disposed in the airflow correction area generated downstream of the airflow correction means Thus, the temporarily corrected airflow in the duct is reliably supplied to the wind speed sensor, and further stable detection of the wind speed in the duct is possible.

Further, if the length of the airflow correction means in the casing axial direction is set within a range of 15 to 40% of the casing diameter, an airflow correction area generated on the downstream side of the airflow correction means can be secured. Even when the correction means is provided in the airflow unit main body, an airflow correction area can be secured in the casing of the airflow unit without increasing the axial dimension of the casing.
Even in the case where the casing cross-sectional shape of the airflow unit is rectangular, the same effect can be obtained by converting the vertical dimension and the horizontal dimension of the casing into the equivalent diameter.

  In addition, if the drift correction body for correcting drift is further provided as the airflow correction means, the drift flowing in a state of sticking to a part of the inner wall of the duct is once separated from the inner wall of the duct and then supplied downstream. The airflow in the duct is concentrated on the axial center side, the drift component is eliminated, and the corrected airflow with increased flow velocity is supplied to the wind speed sensor, and the correction area generated downstream of the airflow correction means is wide (especially in the axial direction). The wind speed sensor can perform more stable detection.

  In addition, if the flow straightening body is a throttle member that restricts the cross-sectional area of the casing to 50 to 80%, the increase in pressure loss due to the provision of the flow straightening body is kept to the minimum while sticking to the inner wall of the duct. The effect of attracting the flowing drift toward the duct axis side is certain. For this reason, a more stable airflow correction area can be obtained, and a corrected airflow in which the wind speed is increased immediately before the wind speed sensor is generated, so that the detection operation by the wind speed sensor can be accurately performed even in the case of a low air volume.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an air volume unit according to a first embodiment of the present invention, FIG. 2 is a side view of the air volume unit shown in FIG. 1, and FIG. 3 is an installation of the air volume unit shown in FIG. FIG. 4 is a schematic cross-sectional view showing a state in which the swirling flow flowing inside is corrected, FIG. 4 is a schematic front view showing a state in which the swirling flow flowing inside the air volume unit is corrected, and FIG. The front view which shows the state which is flowing, (b) is a front view which shows the state in which the left turning flow is flowing.

  As shown in FIGS. 1 to 4, the air volume unit 10 of the present embodiment is connected to a duct 22, and a propeller type wind speed sensor that detects a wind speed of an air flow flowing in the casing 11 in a cylindrical casing 11. 12, an opening / closing blade 14 for opening / closing the inside of the casing 11 around the shaft 13, an opening / closing device 15 for driving the opening / closing blade 14, and an upstream side of the wind speed sensor 12 in the casing 11 as swirl flow mainly as an airflow correction means. And a thin plate-like airflow correction body 16 for correction, which is a part on the cross section of the casing 11 and is provided in a posture passing through the axis of the casing 11 and parallel to the axis. The airflow correction body 16 is arranged in a posture in which the cross section of the casing 11 is equally divided into two regions, and both ends thereof are fixed to the inner wall of the casing 11 by fixing means such as screws. For this reason, since the pressure loss of the airflow unit does not increase, the airflow correction body 16 can be provided in the airflow unit 10 without impairing the original performance.

  The wind speed sensor is a sensor casing that incorporates a propeller 17 that rotates by receiving an airflow in the axial direction of the casing 11, and a bearing (not shown) that rotatably supports a rotating shaft (not shown) of the propeller 17 on the leeward side of the propeller 17. 18 and a non-contact detection unit (not shown) provided in the sensor casing 18 for detecting the rotation speed of the propeller 17, and the rotation of the propeller 17 in a state surrounding the outer periphery of the windward tip end portion of the sensor casing 18. And a cap-shaped hub 19 provided at the center. In the present embodiment, the propeller 17 includes four blades arranged at intervals of 90 degrees. The propeller 17 and the hub 19 and the sensor casing 18 are made of synthetic resin, and the propeller 17 and the hub 19 are integrally formed. The non-contact type detection unit uses a Hall element, and the bearing uses a ball bearing. On both sides of the sensor casing 18, mounting tools 20 for fixing the wind speed sensor 12 to the casing 11 are mounted.

  A propeller 17 that rotates in response to an airflow flowing in one direction detects a change in a magnetic field caused by a magnet that rotates with the propeller shaft by a detection unit disposed in the sensor casing 18, and the detection signal is transmitted via the wiring 21. The signal is transmitted to the opening / closing device 15, and the driving force is transmitted from the opening / closing device 15 to the shaft 13 to open / close the opening / closing blade 14 in the casing 11.

  Note that the longer the dimension of the airflow straightening body 16 in the direction along the axis of the casing 11 is, the more reliable the airflow straightening effect can be obtained. However, in this embodiment, the diameter of the casing 11 is 200 mm and the dimension in the axial direction is 450 mm. The plate thickness is set to 1.6 mm and the width is set to 60 mm. For this reason, a necessary and sufficient effect can be acquired only by adding an airflow correction body to the existing air volume unit, without increasing the dimension of the casing in the axial direction. The wind speed sensor 12 is provided in a position parallel to the axis of the casing 11 and at a position where the center of the casing 11 and the downstream end of the airflow correction body 16 and the upstream end of the wind speed sensor 12 are 15 mm.

  Since the duct 22 is arranged in the space behind the ceiling of the building and passes through a large number of bent portions and branch portions from the air conditioning machine room to each living room, the air flowing in the duct 22 is affected by the bent portion of the duct and the like. Disturbance of airflow such as uneven flow occurs, and particularly in the case of a duct having a circular cross section, the disturbance of the airflow is often a swirl flow.

  The right swirl flow 23 flowing while swirling clockwise in the casing 11 of the air volume unit 10 collides with both surfaces of the airflow correction body 16 provided upstream of the wind speed sensor 12, and is temporarily in the axial direction of the casing 11. Is corrected to become a corrected airflow 24. Similarly, immediately after the airflow corrector 16, the corrected airflow 24 flows in the axial direction of the casing 11, and the upper surface of the airflow corrector 16 has an airflow correction area A that is closer to the right side of the cross section and the lower surface is closer to the left side of the cross section. The correction areas B are formed, and each airflow correction area is continuously formed downstream of the airflow correction body 16. In the present embodiment, the wind speed sensor 12 is provided in the center of the casing 11 and at a position where the distance between the downstream end of the airflow correction body 16 and the upstream end of the wind speed sensor 12 is 15 mm. When projected on the cross section, a part of the wind speed sensor 12 is disposed in the airflow correction areas A and B, and the corrected airflow 24 flows through the wind speed sensor 12 and the propeller 17 rotates stably. Therefore, an accurate control signal can be transmitted to the opening / closing device 15 and the air volume unit 10 can be controlled accurately. Further, the corrected airflow 24 that has passed through the wind speed sensor 12 passes through the airflow correction areas A and B, gradually returns to the swirl flow, and flows downstream, but part of the wind speed sensor 12 is in the airflow correction areas A and B. Since they are in a state of being arranged, there is no problem in the operation of the wind speed sensor 12.

  As shown in FIG. 4B, when the left swirl flow 25 flows in the casing 11 of the air volume unit 10, the cross-sectional view is shown on the upper surface of the airflow correction body 16, contrary to the right swirl flow 23 described above. An airflow correction area C that is closer to the left side and an airflow correction area D that is closer to the right side in the cross-sectional view are formed on the lower surface. In the present embodiment, since the wind speed sensor 12 is provided in the center of the casing 11 in a posture parallel to the axis of the casing 11, even when the right swirl flow 23 or the left swirl flow 25 flows in the casing, the cross section of the casing 11. When projected from above, the wind speed sensor 12 is placed in the airflow correction area, and is not affected by the swirling direction of the airflow. In addition, since a windmill-type wind speed sensor is used, the area where the airflow corrector and the windspeed sensor overlap when projected on the casing cross section increases, which increases design freedom and simplifies the structure. This makes it easy to manufacture and allows easy maintenance.

  Further, if the wind speed sensor 12 is arranged so that the center of the airflow correction body 16 is positioned on the cross section of the airflow correction body 16 on the cross section of the casing 11, the airflow sensor 12 is not affected by the turning direction of the airflow as described above. You may provide in the cross section of the body 16 and the position close | similar to the switchgear 15 side, or the position near the inner wall of the casing 11 of the airflow correction area A or the airflow correction area B.

  Next, with reference to FIGS. 5-8, the air volume unit which is the 2nd Embodiment of this invention is demonstrated. FIG. 5 is a front view showing an air volume unit according to the second embodiment of the present invention, FIG. 6 is a side view of the air volume unit shown in FIG. 5, and FIG. 7 is an installation of the air volume unit shown in FIG. FIG. 8 is a schematic cross-sectional view showing a state in which the rightward swirling flow flowing inside is corrected, FIG. 8 is a schematic front view showing a state in which the swirling flow flowing inside the air volume unit is corrected, and FIG. The front view which shows the state which is flowing, (b) is a front view which shows the state in which the left turning flow is flowing. 5 to 8, the portions denoted by the same reference numerals as those in FIGS. 1 to 4 are portions exhibiting the same functions and effects as those in the first embodiment, and thus the description thereof is omitted.

  As shown in FIGS. 5 to 8, the air volume unit 110 of the present embodiment mainly includes two thin plates 116 a in the casing 111 and upstream of the wind speed sensor 12 as airflow correction means for correcting the swirling flow. , 116b in parallel with the axis of the casing 111 and a cross-shaped airflow correction body 116. The airflow straightening body 116 is a part of the cross section of the casing 111 and is arranged so that the intersection of the two thin plates 116a and 116b coincides with the axis of the casing 111. The casing 111 cross section is based on the axis. It is fixed to the inner wall of the casing 111 so as to be divided into four equal parts. For this reason, since the pressure loss of the airflow unit does not increase, the airflow correction body 116 can be provided in the airflow unit 110 without impairing the original performance of the airflow unit.

  Since the casing 111 has a larger diameter than that of the first embodiment, specifically set to 350 mm, it can process a larger air volume than the air volume unit 10 of the first embodiment. As the airflow correction means, a single-letter airflow correction body can be adopted as in the first embodiment, but at least the width of the airflow correction body needs to be extended, and the airflow unit 110 has a dimension in the axial direction. In addition to being large, there is a possibility that the diameter of the casing is large and the strength of the casing is insufficient. In the present embodiment, the airflow straightening body 116 is configured by combining two thin plates 116 a and 116 b having a plate thickness of 1.6 mm and a width of 60 mm, and is fixed in a posture in which the cross section of the casing 111 is divided into four equal parts. There is no need to increase the size of the direction. Further, with the above-described configuration, the casing 111 can be reinforced and the wind speed sensor 12 can be protected.

  Further, when the wind speed sensor 12 is projected on the cross section of the casing 111, the wind speed sensor may be practically used if the wind speed sensor is on or near the projection surface of the airflow correction means. 12 is a crest 117 formed by the two plates 116a and 116b of the airflow correction body 116, and the distance between the downstream end of the airflow correction body 116 and the upstream end of the wind speed sensor 12 is 15 mm. It was.

  The right swirl flow 123 that flows while swirling clockwise in the casing 111 of the air volume unit 110 flows in a strong swirl flow along a portion along the inner wall of the casing 111 and hardly flows in the axial center portion. The strong airflow along the inner wall of the casing 111 is temporarily corrected in the axial center portion and in the axial direction to become a corrected airflow 124. The flow of the portion along the inner wall of the casing 111 is not completely stabilized even after being corrected, and the airflow in the axial center portion is more stable.

  Similarly, airflow correction areas E, F, G, and H by the corrected airflow 124 are formed immediately after the airflow correction body 116, and each airflow correction area is also continuously formed in the downstream area of the airflow correction body 116. It will be. In the present embodiment, the wind speed sensor 12 is provided at a position 40 mm away from the center in the casing 111 and at a position where the distance between the downstream end of the airflow correction body 116 and the upstream end of the wind speed sensor 12 is 15 mm. ), A part of the wind speed sensor 12 is disposed in the airflow correction area F, and the correction airflow 124 flows through the wind speed sensor 12 and the propeller 17 rotates stably. To do. Further, the corrected airflow 124 that has passed through the wind speed sensor 12 passes through the airflow correction areas E, F, G, and H and gradually returns to the swirl flow, but a part of the wind speed sensor 12 is disposed in the airflow correction area F. Therefore, the operation of the wind speed sensor 12 is not hindered as described above.

  Further, as shown in FIG. 8B, when the left swirl flow 125 flows in the casing 111 of the air volume unit 110, the air flow correction areas E, F, G, H are opposite to the right swirl flow 123 described above. The airflow correction areas I, J, K, and L are formed on the opposite surface side. The wind speed sensor 12 is provided at the same place as that in the case of the right swirl flow described above. Even when the right swirl flow 123 or the left swirl flow 125 flows in the casing, the air flow straightening region 116 also has a mountain flow 117 in the air flow straightening region. When the projection is viewed on the cross section of the casing 111, a part of the wind speed sensor 12 is disposed in the airflow correction area, so that it is not affected by the turning direction of the airflow.

  Further, since the airflow correction body 116 divides the cross section of the casing 111 into a plurality of regions and the wind speed sensor 12 is provided in the mountain portion 117, the airflow correction body 116 is not affected by the swirling flow having different states for each of the plurality of zones, and is stable. It can be controlled and is particularly suitable for an air volume unit connected to a large-diameter duct.

  Next, with reference to FIGS. 9-11, the airflow unit which is the 3rd Embodiment of this invention is demonstrated. FIG. 9 is a front view showing an air volume unit according to the third embodiment of the present invention, FIG. 10 is a side view of the air volume unit shown in FIG. 9, and FIG. 11 is an installation of the air volume unit shown in FIG. It is a cross-sectional schematic diagram which shows the state which is correcting the turbulent airflow (especially drift) which flows through the inside. 9 to 11, the portions denoted by the same reference numerals as those in FIGS. 1 to 8 are portions exhibiting the same functions and effects as those in the first embodiment and the second embodiment. Omitted.

  As shown in FIGS. 9 to 11, the air volume unit 210 of the present embodiment is a part of the cross section of the casing 211 as an airflow correction means for correcting the airflow in the duct, as in the second embodiment. An airflow correction body 212 for correcting a swirling flow is configured by combining two thin plates 212 a and 212 b having a plate thickness of 1.6 mm and a width of 60 mm in a cross shape, and the intersection of the thin plates is made to coincide with the axis of the casing 211. The casing 211 is fixed to the inner wall of the casing 211 in a posture that divides the transverse section into four equal parts. On the upstream side of the airflow straightening body 212, as a means for correcting the drift that flows by sticking to a part of the inner wall of the duct 213, a donut-shaped throttle member 214 having a concentric opening on the axis of the casing 211 is further provided. The forcing means 215 is configured. In this embodiment, the outer diameter of the throttle member 214 is set to 300 mm and the inner diameter is set to 250 mm with respect to the diameter of the casing 211, and the casing 211 is provided in the casing 211 in a state of being in close contact with the upstream side of the airflow correction body 212. Further, the wind speed sensor 12 is positioned on the axial center of the casing 211.

  The drift 216 including the swirling component that occurs immediately after the bent portion upstream of the airflow unit 210 and flows along a part of the inner wall of the duct 213 is first corrected from the inner wall side of the casing 211 to the axial center side by the throttle member 214. Is done. Then, when passing through the airflow correction body 212 provided immediately after, the drift 216 including the swirl component further generates a correction airflow 217 that is temporarily corrected in the axial center direction and the axial direction downstream of the airflow correction body 212. By doing so, an airflow correction area M by the corrected airflow 217 can be obtained in the downstream area of the airflow correction means 215, and a part of the wind speed sensor 12 is included in this airflow correction area M. Since the stabilized airflow 217 is supplied to the wind speed sensor 12, the wind speed can be detected stably. Further, since the flow path is throttled by the throttle member 214 and the wind speed of the corrected airflow 217 after passing through the throttle member 214 increases, the wind speed can be stably detected even at a low air volume. Further, the corrected airflow 217 that has passed through the wind speed sensor 12 gradually loses stability after passing through the airflow correction area M. However, as long as a part of the wind speed sensor 12 is disposed in the airflow correction area M, the above-described correction Similarly, the wind speed detection by the wind speed sensor 12 is not hindered.

  In the present embodiment, the airflow correction body 212 is in close contact with the upstream side of the throttle member 214. However, the present invention is not limited to this, and a slight clearance is provided between the throttle member 214 and the airflow correction body 212. Even the one provided or the one provided with the throttle member 214 on the downstream side of the airflow correction body 212 has the same effect as this embodiment.

  Further, even when the drift 216 does not include a swirl component, if the airflow correction means 215 of this embodiment is used, the drift component of the airflow is corrected, and the corrected drift 216 is rectified and stabilized in the wind speed sensor. 12, the wind speed detection by the wind speed sensor 12 is further stabilized. Furthermore, if the airflow correction means composed only of the throttle member 214 is used without the airflow correction body 212, an airflow correction area can be generated in the downstream area with a simple structure of the airflow correction means, and the wind speed sensor 12 is stable. Can be supplied.

  In the present embodiment, the airflow correction body 116 is installed in a posture that is divided into four equal parts with respect to the axis of the casing 111, and the wind speed sensor 12 is provided in the mountain portion 117. However, the present invention is not limited to this. A thin plate provided in parallel on the cross section of the casing, or provided in a lattice shape to divide the cross section into a plurality of parts, or a porous body such as punching or wire mesh provided in a partial area on the casing cross section. Even if it exists, the effect similar to the above-mentioned is acquired.

  Moreover, although the air volume unit which employ | adopted the windmill type wind speed sensor was demonstrated in embodiment, it is not limited to this, Thermistor type wind speed sensor and the wind speed sensor of another system can be employ | adopted.

  Further, in the first to third embodiments, the description has been given of the case where the airflow correction means is incorporated in the casing of the airflow unit. However, the present invention is not limited to this. The airflow correction body can also be provided upstream of the wind speed sensor so as to be integrated with the wind speed sensor. Further, the airflow correction means can be separated from the airflow unit main body and assembled on site. For example, an airflow correction means comprising a swirl flow correction body and a drift correction body in a casing having the same diameter as the casing of the airflow unit can be connected to the airflow unit and attached to the duct during construction on site. For this reason, when the duct layout is changed, such as during refurbishment work, or by adding airflow correction means to the existing airflow unit in an area where the airflow is disturbed, such as immediately after a bent part, Adverse effects can be eliminated.

  The air volume unit of the present invention can be widely used as an air volume control means in various air blowing paths of an air conditioning duct constituting an air conditioning facility.

It is a front view which shows the air volume unit which is the 1st Embodiment of this invention. It is a side view of the air volume unit shown in FIG. It is a cross-sectional schematic diagram which shows the state which installs the airflow unit shown in FIG. 1 in the duct for an air conditioning, and the swirl | flow flows inside. It is a front schematic diagram which shows the state which is correcting the swirl flow which flows into the inside of an air volume unit, (a) is a front view which shows the state in which the right turning flow is flowing, (b) is the state in which the left turning flow is flowing. FIG. It is a front view which shows the air volume unit which is the 2nd Embodiment of this invention. It is a side view of the air volume unit shown in FIG. It is a cross-sectional schematic diagram which shows the state which installs the airflow unit shown in FIG. It is a front schematic diagram which shows the state which is correcting the swirl flow which flows into the inside of an air volume unit, (a) is a front view which shows the state in which the right turning flow is flowing, (b) is the state in which the left turning flow is flowing. FIG. It is a front view which shows the air volume unit which is the 3rd Embodiment of this invention. FIG. 10 is a side view of the air volume unit shown in FIG. 9. It is a cross-sectional schematic diagram which shows the state which installs the airflow unit shown in FIG. 9 in the air-conditioning duct, and corrects the turbulent airflow (especially drift) which flows through the inside.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110 Air volume unit 11, 111 Casing 12 Air speed sensor 13, 113 Shaft 14, 114 Opening / closing blade 15 Opening / closing device 16, 116 Airflow correction plate 17 Propeller 18 Sensor casing 19 Hub 20, 120 Ducting equipment 21 Wiring 22, 122 Duct 23, 123 Right swirl flow 24, 124 Straight air flow 25, 125 Left swirl flow 116 Air flow straightening body 116a, 116b Thin plate 117 Mountain A, B, C, D, E, F, G, H, I, J, K, L, M Airflow correction area

Claims (9)

  An air flow unit comprising: a casing that is connected to an air conditioning duct and forms a flow path therein; an opening and closing blade that opens and closes the flow path in the casing; and a wind speed sensor upstream of the opening and closing blade. An airflow unit characterized in that an airflow correction means for temporarily correcting turbulence in the airflow and generating a corrected airflow region downstream thereof is provided at least upstream of the wind speed sensor.   2. The air volume unit according to claim 1, wherein the wind speed sensor is provided on a projection surface of the airflow correction means when projected on the casing cross section.   3. The air volume unit according to claim 1, wherein the airflow correction means has a shape that partitions the casing cross section into a plurality of regions.   4. The air volume unit according to claim 3, wherein the wind speed sensor is arranged in one area of the casing cross section partitioned into a plurality of areas by the air flow correcting means. 5. The air volume unit according to claim 1, wherein the air flow correcting means is made of a thin plate.   6. The air volume unit according to claim 1, wherein a distance between a downstream end of the airflow correction means and an upstream end of the wind speed sensor is set within a range of 3 to 40 mm.   The airflow unit according to any one of claims 1 to 6, wherein the length of the airflow correction means in the casing axial direction is set within a range of 15 to 40% of a casing diameter.   The airflow unit according to any one of claims 1 to 7, wherein the airflow correction means further includes a drift correction body for correcting drift. The air flow unit according to claim 8, wherein the drift correction body includes a throttle member that restricts a cross-sectional area of the casing to 50 to 80%.

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