JP2008032261A - Air conditioner and ventilating duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner of a simple structure capable of reducing dispersion in supply wind velocities and wind volumes of the air from each of supply openings of a ventilating duct, and to provide the ventilating duct suitably applied to supply a gas for air conditioning. <P>SOLUTION: This air conditioner 10 includes a rectifying cylinder 13 having a spiral rectifying means 20 for applying spiral swirling force to the distributed airflow on its inner face, between a blower 11 and the ventilating duct 12. As the distributed airflow flows in the ventilating duct 12 while spirally swirled by the rectifying means 20 on the inner face of the rectifying cylinder 13 when the distributed airflow from the blower 11 passes through the rectifying cylinder 13, the difference in flow velocities between an upstream side and a downstream side in the ventilating duct 12 is reduced, and the difference in the supplying wind velocities/wind volumes of the conditioned air from each of the supply openings 14 of the ventilating duct 12 can be reduced. Thus equipment costs and adjustment costs can be reduced, and further running costs can be reduced by reducing consumption of energy by the blower 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner that blows air from a plurality of air outlets formed in a ventilation duct by blowing air to the ventilation duct.

  When air conditioning is performed by blowing air that has been adjusted in temperature and humidity, such as factories, gymnasiums, and greenhouses for crop cultivation, air conditioning is performed on a long ventilation duct placed in a wide space for air conditioning. Air is blowing. Many ventilation ducts are mounted substantially horizontally on the upper part of the wall surface (eave part) and the ceiling part, and are provided with a plurality of outlets at intervals in the duct axial direction. In this ventilation duct, a blower is connected to one end, and air is blown out from each outlet by blowing air from the blower into the ventilation duct.

  When a blower is connected to one end of the ventilation duct and the cooling / heating air is blown from the blower to the ventilation duct, the ventilation dynamic pressure in the duct is higher in the upstream where the blower is located and lower in the downstream. For this reason, the blown air velocity / air volume from the upstream air outlet becomes larger than the blown air velocity / air volume from the downstream air outlet. Such variations in wind speed and air volume from a plurality of air outlets arranged in the duct axial direction of the ventilation duct become more prominent as the overall length of the ventilation duct becomes longer.

  Variations in the individual blown air speeds and air volumes from the plurality of air outlets are not considered as a significant problem when air-conditioning the entire room such as a gymnasium. However, when the growth is promoted by blowing individually conditioned winds to a plurality of cultivated crops of the same type in a greenhouse such as a nursery house, the above-mentioned variation in blowing wind speed and air volume is caused by variations in crop growth and quality. It appears. For example, in greenhouse cultivation, air conditioning that blows a gentle breeze of approximately 0.5 m / s or less is effective in order to prevent differences in pollination and growth of individual cultivated crops. However, when a slight wind of 0.5 m / s is generated on the downstream side of the ventilation duct, it greatly exceeds 0.5 m / s on the upstream side of the ventilation duct and inhibits the growth of cultivated crops on the upstream side. It might be. On the other hand, when a gentle breeze of 0.5 m / s is generated on the upstream side, the breeze is significantly lower than 0.5 m / s on the downstream side of the ventilation duct, and the growth of cultivated crops may vary greatly in the house. .

  Also, in the case where product management is performed by blowing individually air-conditioned air-conditioning air of a plurality of industrial products that are easily affected by temperature and humidity, the above variations appear as product quality variations.

Therefore, in order to uniformize the air speed and air volume of the cooling / heating air blown out from a plurality of air outlets scattered in the duct axial direction of the ventilation duct, generally, valves and orifices (for example, patents) A wind speed / air volume adjusting means such as a literature 1) or a damper (for example, see Patent Literature 2) is attached and adjusted individually.
JP 2001-027444 A JP 07-269930 A

  The wind speed / air volume adjusting means has a complicated outlet structure, and it is necessary to individually adjust a plurality of outlets. In addition, since adjustment of individual air outlets affects adjustment of other air outlets, there are problems such as an increase in equipment costs and adjustment costs of the entire air conditioning equipment, and a long time for adjustment. Also, when increasing the amount of air sent from the blower to the ventilation duct so that adjustment by the wind speed and air volume adjustment means provided at each of the plurality of air outlets can be facilitated, a large and expensive blower with a large capacity is required, As the cost increases, a large capacity blower has a problem that the energy consumption increases and the running cost of the air conditioner increases.

  The air conditioner according to the present invention has a blower and a ventilation duct for flowing a blown airflow from the blower in the axial direction of the fan, and the blown airflow is targeted for air conditioning from a plurality of outlets scattered in the axial direction of the ventilation duct. In the air conditioner that blows out, the ventilation duct is provided with a rectifying cylinder on the inlet side, which has rectifying means on the inner surface for rectifying by applying a spiral turning force to the air flow.

  The flow straightening tube may be integrated with the ventilation duct or may be a separate body from the ventilation duct. The rectifying means on the inner surface of the rectifying cylinder may be a protrusion that spirally extends from one end of the rectifying cylinder to the other end, for example.

  According to the present invention, when the blast airflow from the blower flows into and passes through the inlet of the ventilation duct, the blast airflow is swirled by the rectifying cylinder on the inlet side and flows into the ventilation duct in a spiral shape. As a result, the difference in the flow velocity between the upstream side and the downstream side in the ventilation duct can be reduced, and the difference in the blown air velocity / air volume of the conditioned air from each outlet of the ventilation duct can be reduced. Therefore, there is no need to provide special wind speed / air volume adjusting means for each of the plurality of air outlets of the ventilation duct, and the labor for adjusting the air speed / air volume for each air outlet can be saved, and the equipment cost and adjustment cost can be reduced. . In addition, even if the amount of air blown upstream is kept low, the blown air speed / air amount of the conditioned air from the downstream air outlet does not drop so much, and the difference from the upstream air outlet can be reduced. Can be reduced. For this reason, the energy consumption of a fan can be suppressed and a running cost can be reduced.

  Moreover, the ventilation duct provided with the rectification | straightening pipe | tube on the entrance side is easy for application uses other than an air conditioning. For example, if a ventilation duct is used for the intake pipe of an engine, the loss of dynamic pressure of the gas flowing in the pipe is reduced, and air can be efficiently taken in and fuel efficiency is reduced.

  Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an air conditioner that blows breeze of air conditioning air on a plurality of cultivated crops 4 of the same type in a greenhouse 1 of soil cultivation such as a nursery house. The greenhouse 1 has a basket 3 in which a plurality of cultivated crops 4 are planted in a large room of several ha. The plurality of ridges 3 are arranged in parallel at equal intervals, and the cultivated crop 4 is planted in each of the plurality of ridges 3.

  The ventilation system 10 shown in this air conditioner includes a blower 11, a ventilation duct 12, a rectifying cylinder 13 that constitutes an inlet portion of the ventilation duct 12, and a blower outlet 14 that is dotted in the axial direction at the bottom of the ventilation duct 12. I have. The ventilation duct 12 allows the airflow from the blower 11 to flow through a flow path having a required length, and a rectifying cylinder 13 having a predetermined length is connected to the inlet side into which the airflow flows. In this embodiment, the ventilation duct 12 is a cylinder which has the glass wool heat insulating material 16 and the surface material 17 of an aluminum foil, as shown in FIG.

  As shown in FIG. 1, the ventilation duct 12 is installed substantially horizontally with the ridge 3 immediately above each of the plurality of ridges 3. The ventilation duct 12 is suspended from the ceiling of the greenhouse 1 by a hanging tool 21. Each ventilation duct 12 is provided with a plurality of outlets 14 at intervals in the axial direction of the duct. As shown in FIG. 3, the plurality of ventilation ducts 12 are each connected to a common blower 11 via a rectifying cylinder 13. An end portion (exit side) opposite to the blower 11 of each ventilation duct 12 is opened, and a flexible duct 12 ′ is connected to the end side of the adjacent ventilation duct 12 so that the adjacent ducts communicate with each other. Loop loops or connecting common ventilation ducts to form loop ducts.

  As shown in FIG. 4, the rectifying cylinder 13 has rectifying means 20 on the inner surface that rectifies the airflow A from the blower 11 so as to apply a spiral turning force. In this embodiment, the rectifying cylinder 13 is a circular glass wool duct having the same size as the ventilation duct 12 as shown in FIG. The rectifying means 20 on the inner surface of the rectifying cylinder 13 is constituted by a spiral protrusion 20a. The protrusion 20 a is a spiral plate that spirally extends from one opening end of the rectifying cylinder 13 to the other opening end, and is fixed to the inner peripheral surface of the rectifying cylinder 13.

  Although the ventilation duct 12 and the rectifying cylinder 13 can be manufactured separately, one long glass wool duct is manufactured, the inlet side end portion is manufactured in a rectifying cylinder structure, and the rest is directly used as the ventilation duct 12. May be used as If manufactured in this way, it is possible to save the trouble of connecting the rectifying cylinder 13 and the ventilation duct 12 manufactured separately, and a special member for connection can be omitted, and the manufacturing cost and construction cost of the duct can be reduced.

  Next, the air conditioning operation procedure of the flow straightening cylinder 13 will be described. The blower 11 blows air that is air-conditioned in the rectifying cylinder 13. The blown airflow A from the blower 11 flows into the circular flow straightening tube 13 as shown in FIGS. The airflow outside the blast airflow A flowing near the inner surface of the rectifying cylinder 13 in the axial direction of the airflow is rectified in the direction of vortex when flowing along the spiral projection 20a, and is fed into the ventilation duct 12 as it is. Is done.

  Thus, the blast airflow A is rectified in a spiral shape in the rectifying cylinder 13 and travels in the ventilation duct 12 in the axial direction of the duct. The spiral blast airflow B traveling through the ventilation duct 12 is swirled by the outer region airflow, so that the dynamic pressure of the outer region airflow is higher than the central portion and flows at a stable dynamic pressure. Proceeds smoothly with low air resistance. As a result, the air flows from the upstream side to the downstream side of the ventilation duct 12 with approximately the same average dynamic pressure, and is blown out from each of the plurality of outlets 14 at a uniform wind speed and volume. This is also clear from the fact that a stable blown wind speed can be obtained even when the wind speed at the center of the ventilation duct 12 approaches zero. In addition, since the end side of the adjacent ventilation duct 12 is communicated with the flexible duct 12 ′ to form a loop duct configuration, a decrease in the blowing air speed near the end is avoided, and the downstream side is evenly distributed from the outlet 14. It can secure a good wind speed and volume.

  In addition, even if the amount of air blown upstream is kept small compared to the prior art, the blown air speed / air volume of the conditioned air from the downstream air outlet does not drop so much, and the difference from the upstream air outlet can be reduced. The amount of air blown from the blower can be reduced. For this reason, the energy consumption of a fan can be suppressed and a running cost can be reduced.

  As described above, the total length of the rectifying cylinder 13 for feeding the spiral airflow B to the ventilation duct 12 is substantially effective about 1.5 to 2 times the inner diameter of the rectifying cylinder 13. That is, if the total length of the rectifying cylinder 13 is set to be smaller than 1.5 times the inner diameter, a sufficient turning force cannot be applied. Further, as the total length of the rectifying cylinder 13 is increased to twice or more of the inner diameter, the contact resistance due to the spiral protrusion increases and the turning force decreases.

  FIG. 7 shows the contents of a test for testing the effect of attaching the flow straightening cylinder 13 to the ventilation duct 12. In order to give the air flow to the inner peripheral surface of the ventilation duct 12 in the rectifying cylinder 13, a spiral projection 20a is fixed to the inner peripheral surface. The ventilation duct 12 is a duct having a total length of about 20 m, which is a circular straight pipe having an inner diameter of 100 mm using glass wool as a heat insulating material. The ventilation duct 12 was formed by providing circular outlets with a diameter of 30 mm at 52 locations × 2 holes at equal intervals (35 cm) in the axial direction.

  In the test, in the ventilation duct 12A attached with the rectifying cylinder 13 and the ventilation duct 12B attached directly to the blower 11 without attaching the rectifying cylinder 13, the blowing wind speed from the outlet 14 at the same position was compared. In addition, a blower with a constant air volume is used and the air volume is not adjusted.

  As a result, when the rectifying cylinder 13 is installed, the fluctuation width of the blown air speed from No. 2 to 52 upstream of the air duct 12 is 0.7 to 0.1 m / s when the rectifying cylinder 13 is not provided. Was able to stabilize the blowing wind speed at 0.2 to 0.1 m / s.

  In addition, when the rectifying cylinder 13 is installed, it is not necessary to provide a special wind speed / air volume adjusting means at each air outlet 14, the structure of each air outlet 14 is simplified, and equipment costs and adjustment costs can be reduced. At the same time, since the pressure loss due to the air blowing is small, the air blowing power can be reduced.

  In this manner, by attaching the flow straightening cylinder 13, it is possible to blow air substantially uniformly from each of the air outlets 14 with a small amount of blown air. In greenhouse cultivation, since air conditioning with a slight wind of 0.5 m / s or less and less variation is effective for each cultivated crop 4, plants are cultivated as shown in FIG. It is suitable for use in the greenhouse 1 to be used.

  The air conditioner according to one embodiment of the present invention has been described above. However, the air conditioner according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. Of course, it can be added.

  The ventilation duct used for the air conditioner can be diverted to other applications in a state where a flow straightening tube having a flow straightening means is connected to the inner surface. For example, when used in an intake pipe or exhaust pipe of an engine, a loss of dynamic pressure of gas flowing through the intake pipe or exhaust pipe is reduced, so that air can be efficiently taken in and exhausted to reduce fuel consumption.

It is a side view which shows the air-conditioner which concerns on one Embodiment of this invention. It is sectional drawing of the ventilation duct in the apparatus of FIG. It is a top view of the ventilation system in the apparatus of FIG. It is a perspective view of the inlet side rectification | straightening pipe | tube of the ventilation duct in the apparatus of FIG. It is a perspective view of the ventilation duct in the apparatus of FIG. It is a bird's-eye view which shows the cross section of the rectification | straightening cylinder of FIG. It is an experimental data figure for demonstrating the content of the effect confirmation test of the air conditioner which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Greenhouse 10 Ventilation system 11 Blower 12 Ventilation duct 13 Rectification cylinder 14 Air outlet 20 Rectification means 20a Projection

Claims (7)

In the air conditioner that has a blower and a ventilation duct that flows the blown airflow from the blower in the axial direction of the fan, and blows out the blown airflow to the air-conditioning target from a plurality of outlets that are scattered in the axial direction of the ventilation duct.
The air-conditioning apparatus according to claim 1, wherein the ventilation duct includes a rectifying cylinder having an inner surface of a rectification unit that rectifies the blast airflow by applying a spiral turning force to the blast airflow.   The air conditioner according to claim 1, wherein the rectifying means is a protrusion formed on an inner surface of the rectifying cylinder.   The air conditioner according to claim 2, wherein the protrusion extends spirally from one open end to the other open end of the inner surface of the flow straightening cylinder.   The air conditioner according to any one of claims 1 to 3, wherein the rectifying cylinder has an axial total length of 1.5 to 2.0 times an inner diameter.   5. The air conditioner according to claim 1, wherein terminal ends of the plurality of ventilation ducts, each connected to the blower, each having the rectifying cylinder, communicate with each other.   A ventilation duct for flowing gas in the duct axial direction, and integrally provided with a rectification cylinder having rectification means on the inner surface for imparting a swirling force to the inflowing gas and rectifying on the inlet side of the ventilation duct. Ventilation duct characterized by that.   The ventilation duct according to claim 6, wherein the rectifying means is a spiral projection.

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