JPH0712720Y2 - Coanda fluid suction device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a Coanda type fluid suction device, which can be used for an indoor suction part of an air conditioner or the like, and is a dust collecting filter device such as an air cleaner or a vacuum cleaner. It can be used as a suction part.

[Conventional technology]

2. Description of the Related Art Conventionally, in a ventilator for ventilating a room, outside air is supplied while sucking out room air. Further, in an air conditioner that adjusts the temperature and humidity in the room, an air purifier that purifies the air in the room, etc., the air is sucked from the room and discharged to the outside while supplying the outside air to perform ventilation, Alternatively, the sucked indoor air may be passed through a heat exchanger or a dust collection filter as appropriate and then returned to the room for circulation to adjust the indoor temperature and humidity, or to filter airborne dust and other contaminants for cleaning. Is being made.

In sucking such air, generally, a suction port is provided on the ceiling or wall surface in the room, and a negative pressure is generated on the opening surface of the suction port by a pump connected to this duct through a ventilation pipe. The atmosphere of is being sucked.

Further, such a device for sucking air is also used, for example, in a suction part of a household vacuum cleaner, and in such a vacuum cleaner, a pump or the like in the main body sucks air from a suction port, The air on the floor is sucked up by bringing the mouth close to the floor, and the dust on the floor is also sucked up and captured by the dust collecting filter.

[Problems to be solved by the invention]

However, as described above, in the suction portion or the like that directly uses the exhaust operation of the pump or the like to decompress and suction, the suction flow rate depends exclusively on the mechanical capacity of the pump itself,
It is difficult to improve the operating efficiency during suction unless the operating efficiency of the pump itself is increased.

Further, a pump or the like as a drive source for decompression is rarely provided directly at the suction port, and since it is generally connected through a ventilation pipe or the like, pulsation is likely to occur at this portion, and it is generally used as the pump or the like. In addition to the positive displacement type mechanical pump, there is a problem in that even a turbine type pump or the like causes a loss due to turbulent flow, which hinders a smooth flow and impairs suction efficiency.

Further, as described above, when trying to suck air by negative pressure at the suction port, the part that directly generates the suction force is limited to the opening surface of the suction port, it does not work to the distant part, and the suction There is a problem that high suction efficiency cannot be obtained because it depends on the suction action due to the transmission of the negative pressure associated with the suction in the vicinity of the mouth.

An object of the present invention is to provide a Coanda type fluid suction device which has a high suction efficiency of an external fluid, a stable suction flow, and a large suction force action range.

[Means for solving problems]

SUMMARY OF THE INVENTION The present invention is directed to a drive fluid supply port, which is opened substantially continuously in the circumferential direction at one end of a flow guide tube having a substantially circular cross-section, and which can inject a drive fluid supplied from the outside inward in a radial direction, and a drive fluid supply port. Drive fluid deflection surface formed so as to continuously bulge inward from the inner wall surface of the flow guide tube side and be smoothly curved to be continuous with the inner wall surface of the flow guide tube, and the drive fluid supply port. A decompression chamber formed in a substantially cylindrical shape on the opposite side of the driving fluid deflection surface, and a plurality of external fluid suction ports arranged on the peripheral surface of the decompression chamber and each communicating the inside and outside of the decompression chamber, External fluid deflecting means formed at each external fluid suction port and capable of inducing a flow of an external fluid flowing from each of the external fluid intake ports as the pressure in the depressurizing chamber is reduced and deflecting the fluid in a constant swirling direction along the circumferential direction of the depressurizing chamber. It is provided to configure a Coanda type fluid suction device.

[Action]

In the present invention configured as described above, a driving fluid such as compressed air is jetted from the driving fluid supply port, and the jet flow is called a Coanda effect (also called a wall effect) on the driving fluid deflecting surface.
If there is a wall surface on one side of the straight jet, it is deflected by negative pressure on that side and the jet is deflected and sent into the guide pipe, and the fluid in the decompression chamber that comes into contact with this jet is sucked. Then, the suction efficiency is improved by sucking a large amount of external fluid such as outside air from each external fluid suction port through the external fluid suction port due to the reduced pressure caused by the suction inside the depressurization chamber. Further, the external fluid deflecting means of each external fluid suction port generates a swirling flow in the decompression chamber as a flow of the inflowing outside air uniformly eccentric with respect to the central axis. Stabilizes the flow in the decompression chamber and prevents a decrease in suction efficiency. Further, by this swirling flow, a so-called toppled negative pressure core is formed along the central axis in the decompression chamber, and the suction force is generated in a wide area facing the negative pressure core to expand the action range of the suction force. It is possible to achieve the above object.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1 and FIG. 2, the present embodiment applies the Coanda type fluid suction device 10 of the present invention to the indoor side intake portion 3 for air conditioning installed on the ceiling 2 of the living room 1. There, compressed air as a driving fluid is supplied from the pressurizing pipe 4 to be operated, and the air in the living room 1 which is an external fluid is sucked into the intake pipe 5
The incandescent lamp 11 is provided in the lower part and also serves as a lighting device.

The Coanda type fluid suction device 10 is formed into a substantially cylindrical shape, and is inserted into the opening 2A provided in the ceiling 2 from the living room 1 side, and the surrounding support 10A is screwed and fixed to the ceiling 2. In addition, an upper portion, that is, a portion hidden by the ceiling 2 is provided with a flow guide pipe 12, and an upper end of the flow guide pipe 12 is connected to an air conditioning equipment body (not shown) via an intake pipe 5.

Further, around the lower end of the flow guide pipe 12, a substantially slit-shaped drive fluid supply port 13 which is continuous in the circumferential direction and linearly extends toward the outer circumference is provided, and compressed air supplied from the outer circumference side is provided. The pressure is made uniform by the flow resistance of the linear slit-shaped portion, and the flow is evenly ejected toward the inner peripheral side.

The substantially donut-shaped accumulator tank 14 provided on the outer periphery of the drive fluid supply port 13 equalizes the pressure of the compressed air supplied from a compressed air supply source (not shown) via the pressurizing pipe 4, and then the drive fluid supply port 13 The pressure equalization weir 14A is provided inside the drive fluid supply port 13 at a predetermined interval, and the supplied compressed air is flow resistance due to the flow resistance in the interval between the pressure equalization weir 14A and the inner wall of the accumulator tank 14. The pressure distribution in the circumferential direction is made uniform, and then the pressure distribution is sent to the driving fluid supply port 13.

Further, a drive fluid deflecting surface 15 connected to the flow guide tube 12 is provided on the inner periphery of the drive fluid supply port 13, and the drive fluid deflecting surface 15 is
It is continuously bulged inward from the inner wall surface of the drive fluid supply port 13, is smoothly curved so that its cross section is substantially arcuate, and is continuously connected to the inner wall surface of the lower end side of the flow guide tube 12, The jet of compressed air from the fluid supply port 13 is configured to be deflected toward the flow guide tube 12 along the driving fluid deflection surface 15 by the Coanda effect.

Further, a substantially cylindrical decompression chamber 17 is attached on the same axis of the drive fluid supply port 13 on the side opposite to the flow guide pipe 12 via a communication pipe 16 formed in a so-called bell shape. The air in the decompression chamber 17 is drawn into the jet flow flowing along the driving fluid deflection surface 15 and sucked, and the jet pipe is introduced together with the jet flow.
It is configured to be introduced within 12.

Here, the lower end of the decompression chamber 17 is closed by a bottom plate 18, and the bottom plate 18 is formed of a heat transfer material into a substantially bell shape.
The heat generated by the incandescent lamp 11 placed in the recess on the lower surface
The incandescent lamp 11 and the bottom plate 18 are configured to be capable of being transmitted to the inside of the decompression chamber 17, and constitute a heating means. Are formed.

The external fluid suction port 19 forms a substantially U-shaped cut 19A that is convex in the circumferential direction of the decompression chamber 17 and extends in the central axis direction on the circumferential surface of the decompression chamber 17, and is surrounded by this cut. Convex part 1
9B is opened by bending the inside of the decompression chamber 17, and as shown in FIG. 3, the bending angle and the bending direction of each convex portion 19B are aligned in a constant turning direction along the circumferential direction. ing. Here, the external fluid deflecting means is constituted by the inclined convex portion 19B, and the external air flow passing through each external fluid suction port 19 is made uniform with respect to the central axis of the decompression chamber 17 by the convex portion 19B. It is configured to be eccentric.

In this embodiment having such a configuration, the jet of compressed air jetted from the driving fluid supply port 13
Bend along 15. The jet flow along the drive fluid deflection surface 15 is sent toward the flow guide tube 12 and is adiabatically expanded and decompressed in accordance with the deflection, so that the jet flow becomes a high-speed jet flow at a speed of sound called so-called Prandtl-Meyer flow. Therefore, a negative pressure is generated on the side of the communication pipe 16 by the suction effect of the surface of the high-speed jet, and the outside air, that is, the air in the living room 1 is sucked in through the decompression chamber 17 and the external fluid suction port 19.

On the other hand, in the decompression chamber 17, as shown in FIG. 3, the convex portion 19B of the external fluid suction port 19 is formed in a constant swirling direction along the circumferential direction, so that the decompression chamber from the external fluid suction port 19 is
The flow of outside air ejected into the inside of the decompression chamber 17 is uniformly eccentric from the central axis, and a swirling flow around the central axis is formed inside the decompression chamber 17. Here, the pressure inside the decompression chamber 17 is low in the vicinity of the center due to the centrifugal force of the swirling flow, the air is sucked into the communication pipe 16 at the upper portion, and the bottom plate 18 at the lower portion.
And the rising airflow is generated by the heat siphon effect due to the heat generation of the incandescent lamp 11.
As shown in the figure, a negative pressure core 20 rising from the surface of the bottom plate 18 is formed in a so-called torch shape.
20 creates a stable suction flow.

According to this embodiment, the following effects can be obtained.

That is, a suction force is generated by the effect of entrainment of the jet of compressed air from the driving fluid supply port 12 flowing along the driving fluid deflecting surface 15, and the decompression chamber 17 is decompressed and the external fluid suction port 19 is generated.
Since the outside air is sucked from the outside, a large amount of outside air can be sucked in compared with the compressed air supplied to the driving fluid supply port 12.

Further, when generating the suction force, since a mechanical operation part such as a conventional mechanical pump is not used, the operation efficiency is high, and the durability and maintainability can be improved, and
The size can be reduced or the structure can be simplified, and the manufacturing can be made easy and inexpensive.

Furthermore, since the flow along the drive fluid deflecting surface 15 that generates the suction force can be made a continuous steady flow, pulsation does not occur in the communication pipe 16 or the decompression chamber 17 into which the outside air is introduced by the negative pressure, and the suction is performed. The efficiency can be increased.

Further, the external fluid suction port 19 has a constant inclination in the depressurization chamber 17 due to the inclination of the convex portion 19B in the swirling direction so that the flow of the outside air flowing into the depressurization chamber 17 from each is uniformly eccentric with respect to the central axis. It is possible to generate a swirling flow around the central axis, stabilize the flow accompanying suction in the decompression chamber 17, and improve suction efficiency.

Further, the swirling flow in the decompression chamber 17 can form a negative-pressure core 20 in the shape of a spiral along the central axis in the decompression chamber 17, and generate a suction force in a wide area facing the negative-pressure core 20. By doing so, the working range of the suction force that extends to the outside through the external fluid suction port 19 can be expanded.

Further, the negative pressure core 20 has a bottom plate 18 generated by the heat generated by the incandescent lamp 11.
Since it is assisted by the ascending air current due to the heat siphon effect and the suction flow due to the Coanda effect that is the source power is stable, it can be easily and surely formed and a strong suction force can be generated.

The present invention is not limited to the above embodiment,
The following modifications are also included.

That is, the opening radius of the flow guiding tube 12 following the driving fluid deflecting surface 15 may be changed to an arbitrary value, but this opening radius is R, the cross-sectional curvature radius of the driving fluid deflecting surface 15 is r, and the opening radius R is
If it is smaller than 0.1r, the jets flowing along the driving fluid deflecting surface 15 join together near the center and are choked, so that it is difficult for the outside air to be drawn into the vicinity of the center, and the suction efficiency of the external fluid from the communication pipe 16 Is reduced. Also, the opening radius R is
When it is larger than 10r, the flow velocity near the center of the jet flow along the driving fluid deflection surface 15 is reduced, and the suction efficiency from the communication pipe 16 is also reduced. Therefore, the opening radius R is 0.1r <R <10r
It is desirable to be within the range.

Further, the shape of the driving fluid deflecting surface 15 is not limited to a curved surface having a substantially arcuate cross section, and may be a curved surface having another shape. In short, the driving fluid deflecting surface 15 continuously bulges from the inner wall surface of the driving fluid supply port 13 and forms a flow guiding tube. If the curved surface is continuous with the inner wall surface of 12, the Coanda effect can be generated and the driving fluid can be deflected. For example, by using a diffusion curved surface used for a supersonic three-dimensional nozzle or the like, the flow guiding effect and the acceleration can be achieved. Although it can be obtained, it is easy to manufacture if it has a substantially arc-shaped cross section as in the above embodiment.

Further, providing the pressure accumulating tank 14 and the pressure equalizing weir 14A on the outer periphery of the driving fluid supply port 12 is not essential to the present invention and can be omitted as appropriate, but the flow along the driving fluid deflecting surface 15 that generates the suction force is In order to keep the balance in the circumferential direction, it is desirable to make the circumferential pressure of the compressed air or the like supplied to the drive fluid supply port 12 uniform as in the above embodiment.

On the other hand, the decompression chamber 17 is not limited to a cylindrical shape, and may be a hollow cylindrical body having a polygonal cross section, but considering the stability of the swirling flow formed inside, as shown in FIG. The cross-sectional shape is preferably a point symmetric figure such as a regular polygon or a circle.

In FIG. 4, when the decompression chamber 17 has a polygonal cross section,
If the substantially U-shaped external fluid suction port 19 is formed in the vicinity of the apex portion of the polygon on each peripheral surface 17A, that is, in the vicinity of the ridge line 17B, the open surface protrudes to the outside, so that the outside air to be sucked in can be introduced efficiently. At the same time, if the substantially U-shaped convex portion 19B is formed along the adjacent circumferential surface 17A as the external fluid deflecting means, the depressurizing chamber 17 can be effectively regulated by controlling the inflowing flow direction.
A reliable swirl flow can be formed inside.

Further, the external fluid suction port 19 and the external fluid deflecting means are
The rectangular opening 19C is formed not only on the peripheral surface 17A of the decompression chamber 17 by the substantially U-shaped cut 19A but also on the peripheral surface 17A as shown in FIG. , This opening 19C
The external fluid deflecting means may be formed by attaching a separate flow guide member 19D or the like from the back side or the front side.

Further, the external fluid suction port 19 is not limited to one that continuously opens in the central axis direction of the decompression chamber 17, but as shown in FIG.
19E may be arranged in the central axis direction, or such small holes 19E may be evenly distributed on the peripheral surface 17A, and may be appropriately selected for implementation. In this case, the external fluid deflecting means can be configured for each of the small holes 19E by inclining the penetrating axis of the small holes 19E so as to be along a certain turning direction.

Further, it is not essential for the present invention to provide the incandescent lamp 11 at the bottom of the decompression chamber 17 and use the Coanda type fluid suction device 10 as illumination, and the incandescent lamp 11 may be omitted as appropriate.
According to the above-mentioned embodiment, it is possible to easily construct the ceiling 2 portion of the living room 1 without separately providing illumination, and to easily form the negative pressure core 20 by the heat siphon effect.

Further, the heating means for obtaining the heat siphon effect is not limited to the incandescent lamp 11, and other heat sources may be used, for example, a panel heater or the like may be attached to the inner surface of the bottom plate 18, but at this time, It is desirable that the depressurization chamber 17 has a flat surface without irregularities so as not to disturb the swirling flow in the decompression chamber 17.

Further, it is not essential to form the bottom plate 18 into a substantially bell shape, and it may have a normal flat plate shape when the incandescent lamp 11 is not used. In short, the decompression chamber 17 is closed to reduce the pressure inside the decompression chamber 17. As long as it can maintain.

Further, the bottom plate 18 is not essential to the present invention. For example, as shown in FIG. 7, the suction portion of the cleaner for sucking dust and the like on the floor surface 6 of the living room 1 by the Coanda type fluid suction device 10 together with the ambient air. When used as 7, the bottom side of the decompression chamber 17 is left open, and the opening 17D on the bottom side is closed by the floor surface 3 of the living room 1 or the like to generate the negative pressure core 20 with the decompression chamber 17 as a closed space. It is also possible to configure the decompression chamber 17 which is closed for use and whose inside can be decompressed.

Further, the Coanda type fluid suction device 10 of the present invention is the ceiling 2 of the living room 1 as the suction part of the air conditioner as in the above embodiment.
However, the upper and lower sides described in the above embodiments are arbitrary, and the shape of the details or the support structure may be appropriately selected for implementation.

Further, by appropriately selecting the driving fluid and the external fluid, it can be applied to various applications other than the air conditioner and the vacuum cleaner. Furthermore, the size of the decompression chamber 17 is also arbitrary, and for example, the longitudinally slit-shaped external fluid suction ports may be provided in the four corners of the living room 1 to make the living room 1 itself a decompressing chamber, and the internal air can be efficiently exhausted. It can be applied to smoking rooms or clean rooms.

[Effect of device]

As described above, according to the Coanda type fluid suction device of the present invention, the suction efficiency of the external fluid can be increased, the suction flow can be stabilized, and the action range of the suction force can be increased. As described above, an excellent suction operation can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the embodiment, FIG. 2 is a sectional view showing the embodiment, and FIG. 3 is III- of FIG. Sectional view showing line III, FIG. 4 is a sectional view corresponding to FIG. 3 showing a modification of the present invention, and FIG.
FIG. 6 and FIG. 6 are perspective views showing different modifications of the present invention, and FIG. 7 is a side view showing still another modification of the present invention. 1 ... Suction part of air conditioner, 7 ... Suction part of cleaner, 10 ...
Coanda type fluid suction device, 11 ... Incandescent lamp also serving as heating means, 12 ... Flow pipe, 13 ... Drive fluid supply port, 15 ... Drive fluid deflecting surface, 16 ... Communication pipe, 17 ... Decompression chamber, 18 ... Bottom plate, 19 ... External fluid suction port, 19B, 19D ... Projection and flow guide member that are external fluid deflection means, 20 ... Negative pressure core.

Claims (1)

[Scope of utility model registration request] 1. A drive fluid supply port, which is opened substantially continuously in the circumferential direction at one end of a flow guide tube having a substantially circular cross section and which is capable of injecting a drive fluid supplied from the outside inward in a radial direction, and the drive flow. A drive fluid deflecting surface that is formed so as to continuously bulge inward from the inner wall surface of the other supply port on the side of the flow guide tube and be smoothly curved so as to be continuous with the inner wall surface of the flow guide tube; A decompression chamber formed in a substantially cylindrical shape on the opposite side of the drive fluid deflection surface of the supply port, and a plurality of external fluid suction ports arranged on the peripheral surface of the decompression chamber and each communicating between the inside and outside of the decompression chamber. And an external fluid deflecting means that is formed at each external fluid suction port and that guides a flow of external fluid that flows from each of the external fluid intake ports as the pressure in the decompression chamber is reduced and that can be deflected in a constant swirling direction along the circumferential direction of the decompression chamber. And a Coanda type fluid suction device.