JP2011080759A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a range and a side wind physical strength of an air flow without increasing a blowout initial speed. <P>SOLUTION: The blower is composed of directing air flow outlets 1a of a plurality of cross flow blowers 1 in mutually the same direction, and disposing the cross flow blowers 1 side by side in the direction orthogonal to the extending direction of axes C of impellers of the cross flow blowers 1 and orthogonal to the facing direction of the air flow outlets 1a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air blower suitable for use in an air curtain or the like, and more particularly, to an air blower having a large airflow reach, low noise, and high crosswind resistance.

  In general, in a large space, the reaching distance of the downdraft from the air curtain blower differs depending on whether the space temperature is uniform or non-uniform. When the space temperature is uniform, the reaching distance of the blown-down airflow is almost the same as that of the horizontal blowout, but if there is a temperature difference between the ceiling and the floor, the larger the temperature difference, the larger the airflow The reach is small. Further, when the temperature difference is the same, the reach distance of the blown-down airflow is proportional to the magnitude of the initial blowout speed (see Non-Patent Document 1).

The room temperature is distributed in a “layer” shape due to the mass difference of the air and becomes the highest temperature near the ceiling.
Therefore, in a factory with a high ceiling height, the downdraft from the air curtain blower does not sufficiently reach the floor, and the indoor warm air and the outdoor cold air are easily exchanged through the opening. This is the biggest cause of reduced heating effect in factories with high ceilings.

Moreover, when installing an air curtain actually, a thing with a large cross wind proof strength is requested | required in many cases. Here, as shown in FIG. 9, the cross wind resistance is the same as the outside wind speed (cross wind) that hits the opening OP where the air curtain is installed, and the blowout wind speed (initial speed) v ₁ [m / s] of the air curtain, The relationship between the lateral wind proof strength = the external wind speed v ₀ [m / s] hitting the opening OP and the blowout air volume Q [m ³ / (m ² · s)] of the air curtain per unit area of the opening OP is as follows: It is represented by Formula (1).
v ₀ ² = Q × v ₁ (1)

On the other hand, the blowout air volume Q per unit area of the opening OP, the blower outlet opening area (m ² ) A, the blower outlet opening width (m) W of the blower, and the blower opening length of the blower Sa (m)
= The relationship between the length (m) L of the opening OP and the height (m) H of the opening OP is expressed by the following equation (2).
It is represented by
Q = (v ₁ × L × W) / (L × H) = (v ₁ × W) / H (2)

Since the height H of the opening OP is a determined numerical value, if it is set as a constant K, from the above formulas (1) and (2),
v ₀ ² = (v ₁ ² × W) / K (3)
Is obtained.

Therefore, from the above equation (3), in order to increase the cross wind resistance, it is necessary to increase the blowing speed (initial speed) v ₁ of the air curtain or increase the outlet opening width W of the blower. I understand.

The third edition of the Mechanical Engineering Handbook published by the Japan Society of Mechanical Engineers in 1989 Application, B8, Chapter 2, Air conditioning, B8-41, left column

  However, if the initial blowout speed from the blower outlet of the blower is increased in order to solve the above problem, the reach distance and the cross wind resistance increase, but there is a problem that noise is generated from the blower and the blower itself. There is also a problem that the airflow of the air curtain becomes an obstacle for people passing through the opening where the air curtain is installed. Further, when trying to increase the initial blowing speed from the blower outlet of the blower, a large blower is required, which causes a problem that a large occupied space is taken near the ceiling or the like.

  Thus, as a result of the inventor's research on this problem, it has been found that the same effect can be obtained as increasing the initial blowing speed if the velocity attenuation of the airflow is reduced.

  The present invention aims to advantageously solve the above-mentioned problems in view of the above knowledge, and the air blower of the present invention directs the air flow outlets of a plurality of cross-flow fans in the same direction. Thus, they are arranged side by side in a direction perpendicular to the extending direction of the axis of the impeller of the once-through fan and perpendicular to the direction of the air flow outlet.

  As described above, the airflow outlets of the plurality of once-through fans are directed in the same direction, orthogonal to the direction in which the axis of the impeller of those once-through fans extends, and orthogonal to the direction of the air outlet The airflows blown out from the airflow outlets of those once-through fans overlap each other in the direction perpendicular to the direction of the airflow outlets and the direction of the extension of the impeller axis of the once-through fan. A thick airflow is formed in the core portion inside the surface layer portion.

  By the way, the airflow (jet) blown out from the airflow outlet is attracted to the surrounding air and the air volume increases as the distance from the airflow outlet increases, but the wind speed attenuates. The attraction action is proportional to the surface area of the jet, and the greater the surface area, the greater the amount of attraction air. Therefore, even if the surface area of the jet is the same, the amount of the core part is larger, that is, the air flow with a thicker core part reduces the wind speed attenuation of the core part while maintaining the induced air volume. And if wind speed attenuation decreases, the reach | attainment distance of an airflow will become large correspondingly.

  Therefore, according to the blower of the present invention, the reach distance of the airflow can be increased without increasing the initial blowout speed, so that no noise is generated from the blower outlet and the blower itself, and for those who pass through the opening. The air curtain can reach the floor from the ceiling to the floor sufficiently in a factory with a high ceiling without obstructing the air flow of the air curtain and taking up a large space near the top with a large air blower. , Can increase the heating effect.

  In addition, according to the blower of the present invention, since the core portion forms a thick air flow, which is the same as when the blower opening width is increased, the cross wind resistance can be increased without increasing the initial blow speed.

It is a perspective view which shows one Example of the air blower of this invention. (A), (b) is explanatory drawing which shows the airflow blower outlet of the conventional air blower and the air blower of the said Example, respectively. (A), (b) is explanatory drawing which compares and shows the attracting effect of the airflow of the conventional air blower and the air blower of the said Example. (A), (b), (c), (d) contrasts the airflow attenuation state of the conventional blower, the blower of the above embodiment, and the blower of the other two types of embodiments of the present invention. It is explanatory drawing typically shown. (A), (b) is explanatory drawing which each shows the airflow blower outlet of the air blower of the other Example of this invention shown in FIG.4 (c), and the further another Example of this invention. (A), (b) is explanatory drawing which compares and shows the condition of the airflow of the conventional air blower and the air blower of another Example of this invention. (A), (b) is explanatory drawing which compares and shows the condition of the airflow of the conventional air blower and the air blower of another Example of this invention. (A), (b) is explanatory drawing which compares and shows the condition of the airflow of the conventional air blower and the air blower of another Example of this invention. It is a basic diagram which shows the opening part which installs an air curtain, and the installation condition of an air curtain.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the blower according to the present invention, and FIGS. 2A and 2B show air flow outlets of the conventional blower and the blower of the above embodiment, respectively. 3 (a) and 3 (b) are explanatory views showing the airflow attracting action of the conventional blower and the blower of the above embodiment in comparison with each other, and FIG. 4 (a), (b), ( c) and (d) are explanatory views schematically showing the airflow attenuation state of the conventional blower device, the blower device of the above embodiment, and the blower device of the other two types of embodiments of the present invention in comparison. 5 (a) and 5 (b) are explanatory views respectively showing the air flow outlets of the air blower of another embodiment of the present invention shown in FIG. 4 (c) and still another embodiment of the present invention. The code | symbol 1 in a figure shows the once-through fan which comprises an air blower.

  As shown in FIG. 2 (b), the air blower of the embodiment shown in FIG. 1 has two cross-flow fans (for example, a product name long fan sold by the applicant of the present application) 1 in close contact with each other. The air flow outlets 1a of the cross-flow blowers 1 are directed in the same direction (downward in FIG. 2B), orthogonal to the extending direction of the axis C of the impellers of the cross-flow blowers 1 and the air flow outlets 1a. They are arranged in close contact with each other in a direction orthogonal to the direction in which they face (the left-right direction in FIG. 2B).

  According to the air blower of this embodiment, as shown in FIG. 1, the intake air 4 is introduced into the cross flow blower 1 from the side surfaces of the cross flow blowers 1 by the rotation of the impellers in the two cross flow blowers 1, As shown in FIG. 2B, the air is blown out from the air flow outlets 1a directed in the same direction as the single blown air flows 2, respectively, and the single blown air flows 2 are directed to the air flow outlets 1a. 1 and in the direction perpendicular to the direction of extension of the axis C of the once-through fan 1 (the left-right direction in FIG. 2B) overlap each other to form a composite blown airflow 3, as shown in FIG.

  As shown in FIG. 3A, the single blown air flow 2 from one cross-flow blower 1 constituting the conventional blower is thin, so that the air flow is increased while the induced air flow 2a is involved from the outside to increase the air volume. Since the wind speed is attenuated before it is far from the air outlet 1a, the arrival distance will not increase so much unless the initial blow speed is increased, but the combined blow from the two cross-flow fans 1 constituting the blower of this embodiment. As shown in FIG. 3B, the air flow 3 is generally thick, so the core portion 3c inside the surface portion has a thick increasing core portion 3d, and the surface portion of the jet is the induced air 3a. Is increased from the outside without causing the wind speed to decelerate due to the influence of the induced wind 3a from the outside, and then the wind speed is influenced by the inside attracting wind 3b. The damping core portion 3e to decelerate. Therefore, even if the synthetic blown air flow 3 has the same surface area as that of the single blown air flow 2, the arrival distance of the air flow is increased by a small amount of wind speed attenuation.

  Therefore, if the air blower of this embodiment is provided in the vicinity of the ceiling and the air curtain is formed by the downward blowing airflow therefrom, the reach distance of the airflow can be increased without increasing the initial blowing speed. The ceiling height does not generate noise from the blower itself, the airflow of the air curtain does not get in the way for people passing through the opening, and the large blower does not take up a large space near the top. It is possible to sufficiently reach the air curtain from the vicinity of the ceiling to the floor in a high factory, and the heating effect can be enhanced.

  Moreover, according to the blower of this embodiment, as shown in FIG. 2 (b), unlike the blower opening width w of one cross-flow blower 1 constituting the conventional blower shown in FIG. 2 (a). Since the outlet opening width W of the two once-through fans 1 is w × 2, the core portion 3a forms a thick blown air flow 3, so that the cross wind resistance can be increased without increasing the blow initial velocity. it can.

  By the way, compared with the conventional air blower shown in FIG. 4A, in this invention, as the number of once-through fans 1 increases, the thickness of the core portion 3a becomes smaller as shown in FIGS. 4B to 4D. As the speed increases, the amount of wind speed attenuation of the combined blown airflow 3 decreases, and the airflow arrival distance is extended. 4 (b) shows the configuration of the above embodiment with two cross-flow fans 1, and FIGS. 4 (c) and 4 (d) show the configurations of three and five other cross-flow fans 1. ing.

  Fig.5 (a) shows the example of a specific arrangement | positioning of the three flow-through fans 1 of the Example shown in FIG.4 (c), FIG.5 (b) shows the four flow-through of another Example. The example of the specific arrangement | positioning of the air blower 1 is shown, According to these arrangement | positioning, without the inlet port of the once-through fan 1 which takes in the intake air 4 being obstruct | occluded by the other once-through fan 1, By placing the blower 1 in close contact, the same effect as in the previous embodiment can be obtained.

  FIG. 6 shows, as still another embodiment of the blower according to the present invention, a set of blowers configured by arranging a plurality of cross-flow blowers in a predetermined direction for conveying a large space such as an indoor parking lot or a factory. The aligned ductless gas transfer system is shown in contrast to the conventional ductless gas transfer system in which the single flow-through fans are aligned in a predetermined direction. FIG. 6 (a) shows each flow-through fan 1 one by one. The air in the space S is sequentially arranged in the predetermined direction in the space S by the air flow 2 that is aligned in the direction toward the predetermined direction (rightward in the figure) with an interval in that direction and blown out from the air flow outlet of the cross-flow blower 1. FIG. 6B shows a ductless gas transport system for transporting, in the space S, a set of air blowers composed of, for example, two cross-flow fans 1 arranged in a horizontal direction in a predetermined direction (right in the figure). At an interval in that direction Side surfaces respectively showing the ductless gas transfer system of the above-described embodiment in which a plurality of sets are aligned and the air in the space S is sequentially transferred in the predetermined direction by the combined blowing air flow 3 blown out from the air flow outlet of each set of cross-flow blowers 1 FIG.

  As shown in FIG. 6, in the ductless gas transfer system of this embodiment, each set of once-through fans 1 sends an air flow farther than the conventional one-way fan 1, so that the installation interval of the once-through fans 1 is wider than before. Thus, the degree of freedom of arrangement of the once-through fan 1 can be increased, and when the installation interval of the once-through fan 1 is made the same as that of the prior art, the ventilation efficiency can be increased as compared with the conventional case.

  FIG. 7 shows, as still another embodiment of the blower of the present invention, a plurality of units for zoning (partition) of a large space such as an atrium, a hall, a gymnasium and the like and for stirring for equalizing the temperature in the partitioned space. FIG. 7 (a) shows a circulator formed by arranging a set of blower devices arranged side by side on a ceiling, for example, in comparison with a conventional circulator formed by using a cross flow blower. Conventionally, each cross-flow fan 1 is provided downward on the ceiling in the space S, and the space S is partitioned by the air flow 2 blown downward from the air flow outlet of the cross-flow fan 1 and the air in the partitioned space is stirred. FIG. 7B shows a circulator of FIG. 7B, in which, for example, a set of air blowers configured by horizontally arranging, for example, two cross-flow fans 1 side by side is provided downward on the ceiling, for example, in the space S. Along with partitioning the space S in Synthesis balloon stream 3 blown downward from the airflow outlet of the cross-flow fan 1 of the circulator of the above embodiments for stirring the air of the partitions in a space which is a side view showing respectively.

  As shown in FIG. 7, in the circulator of this embodiment, each pair of once-through fans 1 sends an air flow closer to the floor than one conventional once-through fan 1, so that the space S is more effectively partitioned than the conventional circulator. The air in the partitioned space can be stirred more efficiently than a conventional circulator.

  FIG. 8 shows, as still another embodiment of the air blower of the present invention, a set of air blowers in which a plurality of cross-flow blowers are arranged side by side for countermeasures against radiant heat, cold draft and dew condensation in the perimeter zone near the indoor window. FIG. 8A shows an air barrier formed by being arranged inside the lower end of the window in comparison with an air barrier formed by using a conventional cross-flow fan. FIG. 8A shows a single cross-flow fan 1. An airflow 2 is provided in the pericounter PC close to the lower end of the window in the space S inside the window WW, and the airflow 2 taken in from the air inlet IP and blown upward from the airflow outlet of the cross-flow fan 1 A conventional air barrier that prevents radiant heat, cold draft, and condensation in the perimeter zone between the blind B and the window WW by sending upward along the WW and discharging from the air outlet DP, FIG. b) shows, for example, a set of air blowers configured by horizontally arranging, for example, two cross-flow fans 1 arranged horizontally, upward in the peri counter PC in the space S inside the window WW, near the lower end of the window. The blind blow B is provided by sending the synthetic blown air flow 3 taken in from the air suction port IP and blown upward from the air flow blowout port of the once-through blower 1 along the window WW and discharged from the air discharge port DP. It is a side view which shows the air barrier of the said Example which prevents the radiant heat of the perimeter zone between the windows WW, a cold draft, and dew condensation, respectively.

  As shown in FIG. 8, the air barrier of this embodiment is more efficient than the conventional air barrier because each set of cross-flow fans 1 sends an air flow closer to the ceiling than one conventional cross-flow fan 1. Ventilation can be used to more effectively prevent radiant heat, cold draft and condensation in the perimeter zone.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, a single air blower is configured. The number of cross-flow fans 1 may be further increased, and a plurality of cross-flow fans 1 are arranged with a gap therebetween and only the air flow outlets 1a of these cross-flow fans 1 are extended so as to approach each other. You may make it close mutually. Furthermore, the air blower of the present invention may be provided vertically on the side wall instead of near the ceiling to form an air curtain, or may be used for applications other than the above-described air curtain, ductless air blowing system, and air barrier formation. .

  Thus, according to the air blower of the present invention, the reach distance of the air flow can be increased without increasing the initial blow speed, so that no noise is generated from the air outlet and the air blower itself, and air is passed to the person passing through the opening. The air curtain can reach the floor from the ceiling to the floor sufficiently in a factory with a high ceiling without the airflow of the curtain getting in the way and without taking up a large space near the top with a large air blower. Heating effect can be enhanced.

  In addition, according to the blower of the present invention, since the core portion forms a thick air flow, which is the same as when the blower opening width is increased, the cross wind resistance can be increased without increasing the initial blow speed.

1
Cross-flow fan 1a Air outlet 2
Single blowout airflow 3
Synthetic blowout air 3a Attracting wind (external)
3b Invitation wind (inside)
3c Core part 3d Increase core part 3e Decay core part 4
Intake B
Blind DP Air outlet H
Opening height IP Air inlet L
Opening length (Air curtain blowing length)
OP opening PC Pericounter S
Space v ₀ crosswind w
Airflow outlet thickness W
Outlet airflow thickness (air curtain blowing width)
WW window

Claims (3)

  The air flow outlets of a plurality of cross-flow fans are arranged in the same direction and arranged side by side in a direction orthogonal to the direction in which the axis of the impeller of the cross-flow fan extends and to the direction of the air flow outlet. A blower.   The air blower according to claim 1, wherein an air curtain that blocks an opening is formed by an air flow blown from an air flow outlet of the plurality of once-through fans. The blower according to claim 2, wherein the blower is installed above the opening.

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