JP6789137B2 - Blower - Google Patents

Description

The present invention relates to a blower that blows air.

A blower that generates a band-shaped air flow may be used for the purpose of reducing the load on the air conditioner. In this case, the blower is installed so that the band-shaped air flow generated from the blower covers the entrance and exit of the building. The band-shaped air flow that covers the entrance and exit of the building functions as an air curtain that prevents outside air from entering the inside of the building and indoor air from leaking to the outside of the building. As a result, the load on the air conditioner is reduced. Patent Document 1 discloses a blower that generates a band-shaped air flow by using an axial flow impeller.

Japanese Unexamined Patent Publication No. 6-313603

The entrance and exit of a building may be enlarged depending on the size or use of the building. For example, in a warehouse that stores food, it is necessary to increase the height of the doorway in order to carry in and out many things at once. When a blower is installed above the doorway and air is blown downward to cover the doorway with a band-shaped air flow, the air blown from the blower to bring the airflow below the doorway. Need to increase the speed of. In order to increase the speed of the air blown from the blower, it is necessary to increase the rotation speed of the impeller or increase the outer diameter of the impeller.

However, the upper limit of the electric motor that rotates the impeller may be determined by the frequency of the AC power supply, and the desired rotation speed may not be obtained. Further, if the outer diameter of the impeller is increased, the size of the blower becomes large.

The present invention has been made in view of the above, and an object of the present invention is to obtain a blower capable of increasing the speed of the band-shaped air flow to be blown out while suppressing the increase in size.

In order to solve the above-mentioned problems and achieve the object, in the blower according to the present invention, a plurality of air passages extending in the first direction connecting the suction port and the air outlet have a first direction perpendicular to the first direction. It includes a box-shaped housing formed side by side in two directions, and an electric motor provided in each of the air passages and equipped with an impeller that generates an air flow from the suction port to the air outlet in the air passage. The air outlets extend along the second direction and straddle a plurality of air passages, and are formed side by side in a third direction perpendicular to the first direction and the second direction. The blower is provided between the air outlets, and when viewed along the second direction, the outer bulge portion whose width becomes narrower along the third direction as the distance from the air outlet in the airflow direction is increased. It is characterized by further preparation.

According to the blower according to the present invention, it is possible to increase the speed of the band-shaped air flow to be blown out while suppressing the increase in size.

The figure which looked at the blower which concerns on Embodiment 1 of this invention from the outlet side Cross-sectional view parallel to the air flow direction of the blower according to the first embodiment The figure which looked at the blower which concerns on Embodiment 1 from the suction port side Schematic diagram when the blower according to the first embodiment is used for an air curtain. Schematic diagram when the blower according to the first embodiment is used for air transportation. Schematic diagram when the blower according to the first embodiment is used for circulation. Schematic diagram when the blower according to the first embodiment is used for generating cool breeze.

The blower according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a view of the blower 100 according to the first embodiment of the present invention as viewed from the outlet 3 side. FIG. 2 is a cross-sectional view parallel to the direction from the suction port 2 of the blower 100 according to the first embodiment toward the air outlet 3. FIG. 3 is a view of the blower 100 according to the first embodiment as viewed from the suction port 2 side. In the following description, the direction indicated by the arrow X parallel to the direction from the suction port 2 to the air outlet 3 is set. Further, the direction indicated by the arrow Y perpendicular to the direction indicated by the arrow X is set. Further, the direction indicated by the arrow Z perpendicular to the direction indicated by the arrow X and the direction indicated by the arrow Y is set. The direction indicated by the arrow X is the first direction, the direction indicated by the arrow Y is the second direction, and the direction indicated by the arrow Z is the third direction. FIG. 2 can be rephrased as a cross-sectional view of the blower 100 viewed along the direction indicated by the arrow Y. The blower 100 according to the first embodiment aims to increase the blowing wind speed while suppressing the increase in size.

[Configuration description]
The blower 100 includes a box-shaped housing 1 forming an outer shell and an electric motor 6 provided in the housing 1. The housing 1 is formed in the shape of a rectangular parallelepiped box whose longitudinal direction is the direction indicated by the arrow Y. Inside the housing 1, a plurality of air passages 4 that communicate the suction port 2 and the air outlet 3 are formed. The air passage 4 extends along the direction indicated by the arrow X. The plurality of air passages 4 are formed so as to be arranged at equal intervals in the direction indicated by the arrow Y. The shape of the air passage 4 is a cylindrical shape. In the present embodiment, an example in which five air passages 4 are formed is shown, but the present invention is not limited to this, and the number may be four or less, or six or more. The air taken into the housing 1 from the suction port 2 flows into each air passage 4 and is blown out from the air outlet 3.

Each air passage 4 is provided with an electric motor 6 having an impeller 5. The impeller 5 rotates about a rotation shaft 5a parallel to the direction indicated by the arrow X to generate an air flow from the suction port 2 toward the air outlet 3 in the air passage 4. The electric motor 6 rotates the impeller 5 around the rotation shaft 5a. Although not shown, the electric motor 6 has, for example, a rotatable shaft to which the impeller 5 is connected, a stator around which a winding is wound, a rotor connected to the shaft, and a bearing that rotatably supports the shaft. And so on. The electric motor 6 is provided in each air passage 4 and is locked to a stationary blade 15 that also serves as an electric motor holding portion. One end of the stationary blade 15 is connected to the electric motor 6, and the other end is connected to each air passage 4.

The impeller 5 exemplified in the first embodiment is an axial flow impeller. That is, the impeller 5 has a boss portion 5A connected to the shaft of the electric motor 6 and a plurality of blade portions 5B formed so as to extend radially from the boss portion 5A.

The suction port 2 extends along the direction indicated by the arrow Y with respect to the housing 1, and is formed so as to straddle the plurality of air passages 4. In a certain section of the wall surface of the air passage 4 from the end on the suction port 2 side to the downstream side, a diameter-reduced portion 21A whose diameter is reduced from the upstream side to the downstream side is formed. The reduced diameter portion 21A functions as a bell mouth. In the following description, the term upstream or downstream means upstream or downstream with respect to the flow of airflow in the air passage 4.

The suction port 2 is provided with a protective guard 8 configured in a grid pattern. The protective guard 8 is provided to prevent foreign matter from entering each air passage 4, prevent injuries caused by fingers or the like coming into contact with the blades, and prevent parts such as the blades from scattering in the unlikely event that the blades or the like come off. ing. In the first embodiment, the protective guard 8 is described as being formed by arranging wires in a grid pattern, but the present invention is not limited to this, and the protective guard 8 may be made of a net or a metal. It may be made of a punching metal obtained by forming a plurality of holes in a plate material. Even if the protective guard 8 is configured by using a net, punching metal, or the like, airflow can be passed through, and the above-mentioned foreign matter intrusion prevention, injury prevention, and scattering prevention of parts such as blades can be achieved.

The air outlet 3 is formed on the side of the housing 1 facing the formation surface of the suction port 2. The air outlet 3 is formed in a band shape extending along the direction indicated by the arrow Y, and is formed so as to straddle the plurality of air passages 4. That is, the respective airflows that have passed through the plurality of air passages 4 are collectively blown out from the outlet 3 as a band-shaped airflow. A plurality of outlets 3 are formed in the housing 1, and the outlets 3 are formed side by side in the direction indicated by the arrow Z at intervals from each other. In the first embodiment, two outlets 3 serving as an outlet 3A and an outlet 3B are formed, and the outlet 3A and the outlet 3B sandwich a plane including a plurality of rotation shafts 5a. It is formed symmetrically.

The air passage 4 is formed with a nozzle portion 9 whose cross-sectional area gradually decreases from the suction port 2 side to the air outlet 3 side on the downstream side of the electric motor 6. The nozzle portion 9 includes a nozzle inclined portion 9A and a nozzle flat portion 9B. The nozzle inclined portion 9A is formed in an inclined shape so as to narrow the air passage 4 evenly around the rotation axis 5a of the impeller 5 in the direction indicated by the arrow Z and gradually reduce the cross-sectional area of the air passage 4. Is. On the other hand, the nozzle flat portion 9B is formed parallel to the rotation shaft 5a of the impeller 5 and is connected to the air outlet 3 of the housing 1. That is, the nozzle flat portion 9B is a parallel portion in which a certain section from the end portion on the air outlet 3 side toward the impeller 5 is parallel to the rotation shaft 5a.

A bulging portion 7 extending in the direction indicated by the arrow Y is provided between the outlets 3 formed side by side in the direction indicated by the arrow Z. The bulging portion 7 has an outer bulging portion 7C provided on the downstream side of the outlet 3 and an inner bulging portion 7A provided on the upstream side of the outlet 3.

When viewed along the arrow Y, the outer bulging portion 7C has a narrower width along the direction indicated by the arrow Z as the distance from the outlet 3 in the airflow direction is increased. The outer bulging portion 7C has a triangular shape having an apex 7D on the downstream side and a base on the upstream side as a whole. Of the outer bulging portions 7C, the surfaces 7E facing both sides along the direction indicated by the arrow Z when viewed along the direction indicated by the arrow Y are curved surfaces each of which is convex along the direction indicated by the arrow Z. It has become.

When viewed along the direction indicated by the arrow Y, the inner bulging portion 7A becomes narrower in the direction indicated by the arrow Z as the distance from the outlet 3 toward the motor 6 side increases. The inner bulging portion 7A faces the nozzle flat portion 9B of the air passage 4, and the opposing portion 7B is parallel to the nozzle flat portion 9B. The bulging portion 7 is formed as a whole in a symmetrical shape with a plane including a plurality of rotation axes 5a interposed therebetween. The facing portion 7B and the surface 7E are smoothly connected.

Since the impeller 5 of the blower 100 is driven by the electric motor 6, the flow flowing out from the impeller 5 has a turning speed component in the same direction as the rotation direction of the impeller 5. This turning speed component is recovered as static pressure by the stationary blade 15 inclined to the side opposite to the rotation direction of the impeller 5, and the flow passing through the stationary blade 15 is substantially parallel to the direction along the rotation axis 5a of the impeller 5. It becomes. Therefore, in the blower 100, the swirling velocity component in the flow discharged from the air outlet 3 is also reduced, and a stable band-shaped airflow can be generated.

[Operation description]
The blower 100 configured in this way is attached to the wall surface, ceiling, or the like of the building by the attachment legs 10 provided at both ends of the housing 1. As the impeller 5 rotates, air flows into the blower 100 through the gap of the slit of the protective guard 8 as shown by the arrow in FIG. This airflow flows into each air passage 4 from each suction port 2. The airflow flowing into each air passage 4 is subjected to static pressure and dynamic pressure by the impeller 5. The airflow that has passed through the impeller 5 is divided into two hands by the action of the bulging portion 7 and the nozzle portion 9 after the swirling speed component is recovered as a static pressure when passing through the stationary blade 15.

The airflow divided into two hands blows out from the outlet 3 and flows along the surface 7E. Since the surface 7E is formed on a convex curved surface, the airflow curves along the surface 7E due to the Coanda effect, merges with the flow from the other outlet 3 near the apex 7D, and the direction indicated by the arrow Y. It is discharged into the air-conditioned space as a band-shaped airflow F extending to. By merging the airflows, the wind speed increases from the wind speed of the airflow before merging. Further, since the surface 7E is formed by a convex curved surface, the blowout flow is curved toward the center of the bulge portion 7 due to the Coanda effect, so that the position where the flows divided into two hands merge should be brought closer to the blowout port 3. Can be done. As the merging position approaches the outlet 3, the attenuation of the velocity of the airflow before merging becomes smaller, and the flow velocity of the airflow after merging can be further increased. As a result, the blower 100 can be used for an air curtain that can accommodate a large entrance and exit, or for a circulation that agitates the air in a large space.

[Installation example of blower 100]
FIG. 4 is a schematic view when the blower 100 according to the first embodiment is used for an air curtain. As shown in FIG. 4, the blower 100 is installed in an upper horizontal frame of a three-sided frame such as an entrance / exit 50a of a building 50 so that the air outlet 3 faces downward. The blower 100 can be used as an air curtain that blocks the flow of air entering and exiting from the inlet / outlet 50a of the building 50 by the band-shaped airflow F1 blown out from the outlet 3. For example, in the case of heating and cooling inside a building, it is possible to prevent the cold air and warm air inside the building from escaping to the outside of the building, and it is possible to prevent the cooling and heating efficiency from being reduced.

FIG. 5 is a schematic view when the blower 100 according to the first embodiment is used for air transportation. As shown in FIG. 5, the blower 100 is installed on, for example, a ceiling surface, a wall surface, or the like in the building 50. The blower 100 can be used to convey the fresh outside air taken into the room by the ventilation fan 17A installed on the wall surface of the building 50 as a band-shaped airflow F2 toward the ventilation fan 17B for exhaust on the opposite wall surface. it can.

FIG. 6 is a schematic view when the blower 100 according to the first embodiment is used for circulation. As shown in FIG. 6, the blower 100 is installed, for example, on a ceiling surface, a wall surface, or the like in a building 50 in which an air conditioner 18 is provided. The blower 100 can be used for circulation for agitating the conditioned air blown from the air conditioner 18 into the building 50 by discharging the band-shaped airflow F3.

FIG. 7 is a schematic view when the blower 100 according to the first embodiment is used for generating cool breeze. As shown in FIG. 7, the blower 100 is installed on the ceiling surface or wall surface of the building 50, and is a blower that generates a cool breeze that gives a feeling of cool breeze by applying a band-shaped air flow F4 to a person inside the building 50. Can be used.

[Effect of the blower 100 according to the first embodiment]
The blower 100 according to the first embodiment smoothly divides the airflow generated by the rotation of the impeller 5 into the airflow toward the two outlets 3 by the inner bulging portion 7A, and blows the divided airflow. It can be smoothly merged by the external bulging portion 7C downstream from the outlet 3. Further, since the surface 7E of the external bulging portion 7C is formed of a convex curved surface, as described above, the velocity of the airflow after merging can be increased by the Coanda effect. Therefore, when the blower 100 is used as an air curtain, the air blocking ability can be improved. Further, when the blower 100 is used for air transport, air can be transported farther. Further, when the blower 100 is used for circulation purposes, the reach of the airflow can be made larger, so that the air in the building can be agitated more efficiently. Further, when the blower 100 is used for generating cool breeze, a feeling of cool breeze can be given to the user.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 housing, 2 suction port, 3 outlet, 4 air passage, 5 impeller, 5a rotating shaft, 6 electric motor, 7 bulging part, 7A inner bulging part, 7B facing part, 7C outer bulging part, 7D apex , 7E surface, 9 nozzle part, 9A nozzle inclined part, 9B nozzle flat part, 100 blower.

Claims (5)

A box-shaped housing formed by arranging a plurality of air passages extending in the first direction connecting the suction port and the air outlet in a second direction perpendicular to the first direction.
An electric motor provided in each of the air passages and equipped with an impeller that generates an air flow from the suction port to the air outlet in the air passage.
The electric motor is fixed to the air passage, and is provided with a stationary blade that is inclined in the direction opposite to the rotation direction of the impeller .
The impeller is attached to the suction port side of the electric motor.
The outlet extends along the second direction, straddles the plurality of air passages, and is formed side by side in a third direction perpendicular to the first direction and the second direction.
An outer bulge that is provided between the outlets and, when viewed along the second direction, narrows in width along the third direction as the distance from the outlet in the airflow outlet direction increases. A blower characterized by further provision. Further, an inner bulge that is provided between the outlets and whose width becomes narrower along the third direction as the distance from the outlet toward the motor is increased when viewed along the second direction. The blower according to claim 1, wherein the blower is provided. Claim 1 or claim 1, wherein the outer bulging portion is formed of a curved surface having convex surfaces facing both sides along the third direction when viewed along the second direction. The blower according to 2. The impeller is an axial flow impeller having a rotation axis parallel to the first direction.
One of claims 1 to 3, wherein a certain section of the air passage from the end on the air outlet side toward the impeller is a parallel portion parallel to the rotation axis. The blower described. The blower according to claim 4, wherein the inner bulging portion has a portion facing the parallel portion parallel to the rotation axis when viewed along the second direction.

Images