JP7169211B2 - Suction device and suction method - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a suction device and a suction method.

2. Description of the Related Art Conventionally, suction devices for sucking objects to be sucked (for example, fumes, oily smoke, dust, etc.) are known. For example, Patent Literature 1 discloses an air intake/blower device configured to form an air curtain surrounding a suction port and an object to be sucked.

JP-A-2001-27437

By the way, when air for forming an air curtain is discharged from the discharge ports arranged around the suction port, there is a short circuit of the air flow in which part or most of the discharged air goes directly to the suction port instead of the object to be suctioned. can occur. If such a short circuit occurs, in addition to the reduction in suction efficiency, there is a possibility that the air curtain will not be properly formed and the object to be sucked will be diffused. In this regard, Patent Literature 1 does not disclose knowledge about the influence of the short circuit as described above and a configuration for suppressing the influence.

In view of the circumstances described above, at least one embodiment of the present invention aims to efficiently suck an object to be sucked inside an air curtain.

(1) A suction device according to at least one embodiment of the present invention,
a suction unit having a suction port;
a first discharge portion disposed radially outside the suction port and having a first discharge port for blowing out air so as to form an air curtain around the suction port;
a second discharge part disposed between the suction port and the first discharge port and having a second discharge port for injecting air along a direction orthogonal to the radial direction of the suction port. .

According to the configuration (1) above, the jet of air ejected from the second outlet arranged closer to the suction port than the first outlet for forming the air curtain creates a swirling force on the air flow toward the suction port. can be given. Therefore, compared to a conventional suction device in which the air curtain itself is configured to rotate, for example, it is possible to efficiently turn the air toward the suction port into a tornado with less power. Since the static pressure at the center of the tornado-shaped air flow is much lower than that of the surroundings, the tornado-shaped air flow can exert a suction force to a position farther away from the suction port than when the tornado-shaped air flow is not formed. As a result, since the static pressure at the center of the air curtain becomes negative in the vicinity of the object to be sucked, the efficiency of sucking the object to be sucked can be greatly improved. Moreover, since the air blown out from the first discharge part can be prevented from forming a short circuit and an air curtain can be suitably formed, diffusion of the sucked object can be suppressed.

(2) In some embodiments, in the configuration of (1) above,
The second ejection part includes a convex part that protrudes when viewed from the surface on which the suction port is formed,
The second ejection port may extend along the suction direction of the suction portion in the convex portion.

According to the above configuration (2), by arranging the second ejection port extending along the suction direction of the suction portion on the convex portion protruding from the periphery of the suction port, the second ejection port It can have a thickness or width along the suction direction, that is, the direction of air flow toward the suction port. Thereby, the second ejection port can be formed, for example, in a slit shape extending along the suction direction. Since a planar jet can be jetted against the flow of air toward the suction port via the second discharge port along the suction direction, the air flowing toward the suction port and the second discharge port are jetted. It is possible to increase the contact area with the jet flow. Therefore, it is possible to efficiently impart a swirling force to the flow of air toward the suction port.

(3) In some embodiments, in the configuration of (2) above,
The convex portion is formed in an annular shape centering on the suction port,
The second discharge part is arranged discretely in the circumferential direction of the inner circumference of the convex part, and the plurality of the second discharge parts are arranged so as to impart a swirl force in the same direction to the air flow toward the suction port. It may have a second outlet.

According to the above configuration (3), the air flows toward the suction port from the plurality of second discharge ports discretely arranged in the circumferential direction on the inner circumference of the convex portion formed annularly around the suction port. air can be injected to impart a swirling force in the same direction to the Therefore, it is possible to more efficiently turn the air toward the suction port into a tornado and increase the turning force of the tornado-shaped air.

(4) In some embodiments, in the configuration of (3) above,
The second ejection section may be configured to eject at least part of the air ejected from the second ejection port in parallel with the formation surface of the suction port.

According to the above configuration (4), the configuration in which air is jetted from the second discharge port arranged in the convex portion allows the air to be jetted parallel to the surface on which the suction port is formed against the flow of air toward the suction port. be able to. That is, since the air can be jetted in a direction orthogonal to the flow direction of the air toward the suction port, a swirling force can be efficiently applied to the air flow toward the suction port. .

(5) In some embodiments, in the configuration of any one of (1) to (4) above,
The second ejection section may be configured to eject at least part of the air ejected from the second ejection port obliquely toward the upstream side of the air flow toward the suction port.

According to the above configuration (5), at least a part of the air jetted from the second discharge port is obliquely jetted toward the upstream side of the flow of air toward the suction port, so that the air flowing toward the suction port and the jet stream jetted from the second outlet can be increased in contact area. Therefore, it is possible to efficiently turn the air heading for the suction port into a tornado and increase the turning force of the tornado-shaped air.

(6) In some embodiments, in the configuration of any one of (1) to (5) above,
The second discharge part has a plurality of second discharge ports arranged at different positions in the circumferential direction of the suction port so as to impart a swirling force in the same direction to the air flow toward the suction port. may be

According to the above configuration (6), jets are jetted from a plurality of different directions around the suction port so as to impart a swirling force in the same direction to the air flow toward the suction port along the suction direction. can be done. Therefore, it is possible to more efficiently turn the air toward the suction port into a tornado and increase the turning force of the tornado-shaped air.

(7) In some embodiments, in the configuration of (6) above,
The second ejection parts are arranged at equal intervals so that each of the second ejection parts ejects air toward the centroid when projected onto a virtual one-dimensional coordinate axis that is parallel to the surface on which the suction port is formed and passes through the centroid of the suction port. Having the second outlet arranged,
Each of the second ejection ports may be arranged point-symmetrically with respect to the center of the suction port.

According to the configuration (7) above, when projected onto a virtual one-dimensional coordinate axis that is parallel to the surface on which the suction port is formed and passes through the centroid of the suction port, they are arranged so as to jet air toward the centroid of the suction port. By injecting air from each of the second discharge ports, it is possible to cancel the force acting on the flow of air toward the suction port from the direction perpendicular to the flow. Therefore, since the center of the air flow toward the suction port can be maintained in the vicinity of the suction port, the object to be suctioned can be sucked when the center of the air flow toward the suction port shifts or moves away from the suction port. A decrease in efficiency can be suppressed.

(8) In some embodiments, in the configuration of (6) or (7) above,
The plurality of second ejection ports may be arranged so that jets of air ejected from the respective second ejection ports do not interfere with each other.

According to the above configuration (8), it is possible to suppress the interference between the jets of air ejected from the plurality of second ejection ports. reduction in efficiency can be suppressed.

(9) In some embodiments, in the configuration of any one of (1) to (8) above,
The first discharge port may be configured to blow out the air so as not to give the air curtain a swirling component centered on the suction port.

With configuration (9) above, it is possible to suppress the air curtain from spreading outward due to the centrifugal force caused by the rotation. Therefore, it is possible to prevent the air curtain from being able to apply the dynamic pressure to the object to be sucked toward the suction port in the vicinity of the object to be sucked, thereby preventing the suction efficiency from being lowered.

(10) A suction method according to at least one embodiment of the present invention,
a step of sucking air containing an object to be sucked through a suction port;
forming an air curtain around the suction port by blowing air from a first discharge port arranged radially outside the suction port;
a step of injecting air along the radial direction from a second discharge port disposed between the suction port and the first discharge port;
It has

According to the method (10), as described in (1) above, the jet of air ejected from the second outlet arranged closer to the suction port than the first outlet for forming the air curtain causes the , a swirling force can be imparted to the air flow toward the suction port. Therefore, compared to a conventional suction device in which the air curtain itself is configured to rotate, for example, it is possible to efficiently turn the air toward the suction port into a tornado with less power. Since the static pressure at the center of the tornado-shaped air flow is much lower than that of the surroundings, the tornado-shaped air flow can exert a suction force to a position farther away from the suction port than when the tornado-shaped air flow is not formed. As a result, since the static pressure at the center of the air curtain becomes negative in the vicinity of the object to be sucked, the efficiency of sucking the object to be sucked can be greatly improved. Moreover, since the air blown out from the first discharge part can be prevented from forming a short circuit and an air curtain can be suitably formed, diffusion of the sucked object can be suppressed.

According to at least one embodiment of the present invention, the object to be sucked inside the air curtain can be efficiently sucked.

It is a figure showing roughly composition of a suction device concerning one embodiment of the present invention. FIG. 2 is a diagram schematically showing the jetting direction of air jetted from a second discharge port in one embodiment, where (A) is a cross-sectional view taken along line II-II in FIG. 1, and (B) is the formation of a suction port; It is a figure which shows the state projected on the virtual one-dimensional coordinate axis which is parallel to a surface and passes through the centroid of the suction port. It is a perspective view which shows roughly the structural example of the 2nd discharge part in one Embodiment. It is a figure which shows roughly the structure of the suction device which concerns on other embodiment. 4A is a cross-sectional view taken along the line VV in FIG. 4, and FIG. It is a figure which shows the state projected on the virtual one-dimensional coordinate axis which is parallel to a surface and passes through the centroid of the suction port. It is a figure which shows roughly the structure of the suction device which concerns on other embodiment. 7A is a cross-sectional view taken along line VII-VII in FIG. 6, and FIG. 7B is the formation of the suction port. It is a figure which shows the state projected on the virtual one-dimensional coordinate axis which is parallel to a surface and passes through the centroid of the suction port.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
Further, for example, expressions representing shapes such as a square shape and a cylindrical shape not only represent shapes such as a square shape and a cylindrical shape in a geometrically strict sense, but also within the range where the same effect can be obtained, such as uneven parts and Shapes including chamfers and the like are also represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions excluding the presence of other components.

FIG. 1 is a diagram schematically showing the configuration of a suction device according to one embodiment of the present invention. 2A and 2B are diagrams schematically showing the jetting direction of air jetted from the second outlet in one embodiment, in which (A) is a cross-sectional view taken along line II-II in FIG. 1, and (B) is a suction It is a diagram showing a state projected onto a virtual one-dimensional coordinate axis that is parallel to the mouth forming surface and passes through the centroid of the suction mouth.
As shown in FIGS. 1 and 2, a suction device 1 according to at least one embodiment of the present invention is arranged, for example, on an indoor ceiling or the like, and sucks objects (for example, fumes, oily smoke, dust, etc.) existing indoors. can be suitably used when sucking and discharging outdoors.

The suction device 1 includes a suction portion 10 having a suction port 12, and a first discharge port arranged radially outside the suction port 12 for blowing out air so as to form an air curtain 2 around the suction port 12. 22, and a second discharge port 32 disposed between the suction port 12 and the first discharge port 22 for injecting air along a direction perpendicular to the radial direction of the suction port 12. and a second ejection part 30 having

In addition to the suction port 12, the suction unit 10 includes a cylindrical suction duct 14 that communicates between an indoor space and an outdoor space, and a suction device (not shown) for creating a negative pressure inside the suction duct 14 (for example, suction (including fans, vacuum devices, etc.) and The surface 16 on which the suction port 12 is formed may be the same plane as the surface (for example, the ceiling) on which the suction device 1 is attached. The suction port 12 may be formed in a circular shape when viewed from the direction perpendicular to the forming surface 16 (for example, in plan view), as illustrated in FIG. 2, for example.
In the present disclosure, the radial direction of the suction port 12 means that the suction port 12 is circular, as illustrated in FIG. When the suction port 12 has a shape other than a circular shape, it means the radial direction of an imaginary circle centered on the centroid C of the suction port 12 . Further, the direction in which air is ejected by the second discharge portion 30 (the direction along the direction perpendicular to the radial direction of the suction port 12) is, for example, when viewed from the direction perpendicular to the surface on which the suction port 12 is formed (for example, in plan view). It may be a direction that includes a direction along the tangential line of the mouth 12 and includes a range of about ±20° in the tangential direction, for example.

In addition to the first outlet 22, the first discharge section 20 further includes a duct for sending air indoors and a blower (including, for example, a blower fan and its driving device).
The first outlet 22 may be a port for blowing out air for forming the air curtain 2, or may be a nozzle for compressing and injecting air. For example, the first discharge port 22 may be a port annularly formed around the suction port 12 or may include a plurality of nozzles annularly arranged around the suction port 12 .
The first ejection portion 20 may have a guide portion that guides the air ejected from the first ejection port 22 toward the outside in the radial direction of the suction port 12 . Such a guide portion has a base end portion inside the first discharge port 22 in the radial direction of the suction port 12 , and the suction port 12 moves away from the formation surface 16 of the suction port 12 with the base end portion as a starting point. It may have a shape including a curved surface or an inclined surface that extends radially outward. Such a guide portion may be, for example, a cone or collar member formed continuously (annularly) around the suction port 12 .

The second ejection part 30 is arranged outside the suction port 12 and inside the first ejection port 22 in the radial direction of the suction port 12 . In addition to the second discharge port 32, the second discharge part 30 includes a blower device (for example, a blower fan and its driving device) for sending air indoors (more specifically, in the space surrounded by the air curtain 2). including) further includes. The second outlet 32 may be a nozzle that jets air (compressed air) as a jet. Furthermore, the second ejection port 32 may be arranged on the same plane as the suction port 12 . By doing so, the number of parts can be suppressed and the configuration can be simplified.

According to the configuration in which the second discharge part 30 is arranged between the suction port 12 and the first discharge port 22 for forming the air curtain 2 in this way, the suction port is located closer to the suction port than the first discharge port 22 for forming the air curtain 2 . The jet of air ejected from the second discharge port 32 arranged near the suction port 12 can impart a swirling force to the air flow toward the suction port 12 . Therefore, compared to a conventional suction device in which the air curtain itself is configured to rotate, for example, it is possible to efficiently turn the air toward the suction port 12 into a tornado with less power. Since the static pressure at the center of the tornado-like air flow is much lower than that of the surroundings, the tornado-like air flow can exert a suction force to a position farther away from the suction port 12 than in the case of no tornado-like air flow. As a result, since the static pressure at the center of the air curtain 2 becomes negative in the vicinity of the object 3 to be sucked, the efficiency of sucking the object 3 to be sucked can be significantly improved. In addition, since the air blown out from the first discharge part 20 can be prevented from forming a short circuit and the air curtain 2 can be preferably formed, the space in which fumes, oily smoke, dust, etc. exist and its surroundings can be prevented. It is possible to shield the space and suppress the diffusion of the sucked object 3 .

FIG. 3 is a perspective view schematically showing a configuration example of a second ejection part in one embodiment.
In some embodiments, for example, as shown in FIG. 3 , the second ejection portion 30 includes a convex portion 40 projecting from the surface 16 on which the suction port 12 is formed, and the second ejection port 32 is located at the convex portion 40. It may extend along the suction direction S by the suction unit 10 . Such a convex portion 40 may be, for example, a convex portion 40 that protrudes downward from an indoor ceiling surface. In this case, depending on the number and arrangement of the second ejection ports 32, a plurality of protrusions 40 each having one or a plurality of the second ejection ports 32 disposed thereon may be included.

In this way, by arranging the second ejection port 32 extending along the suction direction S by the suction portion 10 on the convex portion 40 projecting from the periphery of the suction port 12, the second ejection port 32 can It can have a thickness or width along the suction direction S, that is, the direction in which air flows toward the suction port 12 . Thereby, the second ejection port 32 can be formed in a slit shape extending along the suction direction S, for example. Through the second discharge port 32 along the suction direction S, a planar jet can be jetted against the flow of air toward the suction port 12, so that the air flowing toward the suction port 12 and the second discharge The contact area with the jet jetted from the outlet 32 can be increased. Therefore, it is possible to efficiently apply a turning force to the air flow toward the suction port 12 .

In the form having the convex portion 40 , in some embodiments, for example, as shown in FIG. 3 , the convex portion 40 may be annularly formed around the suction port 12 . In this case, the second discharge portions 30 are arranged discretely in the circumferential direction of the inner circumference of the convex portion 40 and are arranged so as to impart a swirling force in the same direction to the air flow toward the suction port 12. It may have a plurality of second ejection ports 32 .
For example, the plurality of second outlets 32 may be oriented to eject air either to the right or to the left of the flow of air toward or toward the suction port 12 from each position.

In this way, according to the configuration in which a plurality of second discharge ports 32 are arranged discretely in the circumferential direction of the inner circumference of the convex portion 40 formed annularly around the suction port 12 , the air flowing toward the suction port 12 Air can be injected so as to impart a swirling force in the same direction to the flow from multiple directions. Therefore, it is possible to more efficiently turn the air toward the suction port 12 into a tornado and increase the turning force of the tornado-shaped air.

FIG. 4 is a diagram schematically showing the configuration of a suction device according to another embodiment. 5A and 5B are diagrams schematically showing the jetting direction of air jetted from the second outlet in one embodiment, where (A) is a cross-sectional view taken along line VV in FIG. 4, and (B) is a suction It is a diagram showing a state projected onto a virtual one-dimensional coordinate axis that is parallel to the mouth forming surface and passes through the centroid of the suction mouth.
In the form having the convex portion 40, in some embodiments, for example, as shown in FIGS. At least part of the air may be configured to be jetted in parallel with the formation surface 16 of the suction port 12 .
That is, the second outlet 32 may include a nozzle arranged to inject air along the forming surface 16 of the suction port 12 .

In this way, according to the configuration in which air is jetted from the second ejection port 32 arranged in the convex portion 40 in parallel with the formation surface 16 of the suction port 12 against the flow of air toward the suction port 12, the suction port Since the air can be jetted in a direction perpendicular to the flow direction (suction direction S) of the air toward the suction port 12, a swirling force is efficiently imparted to the air flow toward the suction port 12. be able to.

FIG. 6 is a diagram schematically showing the configuration of a suction device according to another embodiment. 7A and 7B are diagrams schematically showing the jetting direction of air jetted from the second discharge port in one embodiment, where (A) is a cross-sectional view of VII-VII in FIG. 6, and (B) is a suction It is a diagram showing a state projected onto a virtual one-dimensional coordinate axis that is parallel to the mouth forming surface and passes through the centroid of the suction mouth.
In some embodiments, for example, as shown in FIGS. 1, 6, and 7, the second discharge section 30 directs at least part of the air jetted from the second discharge port 32 to the air directed toward the suction port 12. It may be configured to inject obliquely toward the upstream side of the flow.
For example, when the suction device 1 is arranged on a ceiling surface indoors, the second discharge port 32 is arranged on the upstream side of the flow of air rising toward the suction port 12 along the suction direction S, that is, diagonally downward. It may be configured to inject air. In this case, the second discharge port 32 is formed, for example, in the shape of a slit extending along the radial direction of the suction port 12 or along the suction direction S, thereby preventing the flow of air toward the suction port 12 . It may be configured to be able to jet a flat jet flow.

Thus, according to the configuration in which at least part of the air jetted from the second discharge port 32 is obliquely jetted toward the upstream side of the air flow toward the suction port 12, the air toward the suction port 12 and the second It is possible to increase the contact area with the jet flow ejected from the second outlet 32 . Therefore, it is possible to efficiently turn the air toward the suction port 12 into a tornado and increase the turning force of the tornado-shaped air.

In some embodiments, for example, as shown in FIGS. It may have a plurality of said second outlets 32 arranged to impart a directional turning force.
For example, as in the case described above, the plurality of second discharge ports 32 may jet air toward either the right side or the left side of the flow of air from the suction port 12 to the suction port 12 when viewed from each position. can be oriented to

In this way, according to the configuration in which jets are jetted into the air flow toward the suction port 12 from the plurality of second discharge ports 32 arranged at different positions in the circumferential direction of the suction port 12 , the suction port 12 can be A swirling force in the same direction can be imparted to the air flow toward the suction port 12 along the suction direction S from a plurality of different directions around. Therefore, it is possible to more efficiently turn the air toward the suction port 12 into a tornado and increase the turning force of the tornado-shaped air.

In some embodiments, for example, as shown in FIGS. 2 , 5 and 7 , the second discharge part 30 has a virtual one-dimensional coordinate axis parallel to the formation surface 16 of the suction port 12 and passing through the centroid C of the suction port 12 . When projected onto X (see FIG. 2(B), FIG. 5(B) or FIG. 7(B)), a plurality of second projections arranged at equal intervals so that each jets air toward the centroid C. It may have a discharge port 32 . In this case, each of the second ejection ports 32 may be arranged point-symmetrically with respect to the center of the suction port 12 .
For example, the second ejection port 32 may include a plurality of nozzles arranged along the tangential direction of the suction port 12 (see FIG. 2(A), FIG. 5(A) or FIG. 7(A)). For example, when the opening edge of the suction port 12 is circular, these second ejection openings 32 are designed to eject air from each tangent line in the direction where the contact point between the tangent line and the opening edge exists. may be placed in Although the illustrated example discloses a configuration including a plurality of pairs (ie, four or more) of the second ejection ports 32, the configuration includes only a pair (ie, two) of the second ejection ports 32. good too. Also, the second ejection port 32 may include an odd number (eg, three) of nozzles arranged at equal intervals in the circumferential direction around the center (or the centroid C) of the suction port 12, for example.

In this way, when projected onto a virtual one-dimensional coordinate axis X parallel to the forming surface 16 of the suction port 12 and passing through the centroid C of the suction port 12 (Fig. 2(B), Fig. 5(B) or Fig. 7(B) )), each of which jets air from the pair of second discharge ports 32 arranged so as to jet air toward the centroid C, the flow of air toward the suction port 12 can cancel forces acting perpendicular to the flow. Therefore, since the center of the air flow toward the suction port 12 can be maintained in the vicinity of the suction port 12, the center of the air flow toward the suction port 12 shifts or moves away from the suction port 12, causing the suction to occur. A decrease in suction efficiency of the object 3 can be suppressed.

In some embodiments, the plurality of second outlets 32 may be arranged such that jets of air ejected from the respective second outlets 32 do not interfere with each other.
As an example of such a second ejection port 32, for example, a configuration including only one pair of the second ejection ports 32 arranged point-symmetrically with respect to the center of the suction port 12 described above may be employed.

According to the configuration for suppressing interference between the jets of air jetted from the plurality of second outlets 32 in this manner, the jets jetted from the respective second outlets 32 with respect to the air flow toward the suction port 12 Since the heated air can be made to act efficiently, it is possible to suppress a decrease in efficiency when a swirling force is applied to the flow of air toward the suction port 12 .

In some embodiments, the first outlet 22 may be configured to blow out air so as not to give the air curtain 2 a swirling component centered on the suction port 12 .
For example, the first discharge port 22 is not oriented in a direction that intersects the radial direction of an imaginary circle centered on the centroid C of the suction port 12, but vertically downward or centered on the centroid C of the suction port 12. The ejection openings may be arranged in the radial direction of the virtual circle.

According to such a configuration in which the air curtain does not rotate, it is possible to suppress the air curtain 2 from spreading outward due to the centrifugal force caused by the rotation. Therefore, it is possible to prevent the air curtain 2 from being unable to apply dynamic pressure to the object 3 to be sucked toward the suction port 12 in the vicinity of the object 3 to be sucked, thereby preventing the suction efficiency from being lowered.

Next, a suction method according to at least one embodiment of the present invention will be described.
In the suction method according to at least one embodiment of the present invention, air containing the suction target 3 is sucked through the suction port 12, and the air is blown out from the first discharge port 22 arranged radially outside the suction port 12. An air curtain is formed around the suction port, and air is jetted radially from the second discharge port 32 disposed between the suction port 12 and the first discharge port 22 .

According to such a method, as described above, the jet of air ejected from the second ejection port 32 arranged closer to the suction port 12 than the first ejection port 22 for forming the air curtain 2 causes the suction port. A swirling force can be imparted to the airflow towards 12 . Therefore, compared to a conventional suction device in which the air curtain itself is configured to rotate, for example, it is possible to efficiently turn the air toward the suction port into a tornado with less power. Since the static pressure at the center of the tornado-like air flow is much lower than that of the surroundings, the tornado-like air flow can exert a suction force to a position farther away from the suction port 12 than in the case of no tornado-like air flow. As a result, since the static pressure at the center of the air curtain 2 becomes negative in the vicinity of the object 3 to be sucked, the efficiency of sucking the object 3 to be sucked can be significantly improved. In addition, since the air blown from the first discharge part 20 can be prevented from forming a short circuit and an air curtain can be suitably formed, the diffusion of the sucked object 3 can be suppressed.

The present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

1 suction device 2 air curtain 3 object to be sucked 4 swirling flow 5 jet 10 suction part 12 suction port 14 suction duct 16 suction port formation surface 20 first discharge part 22 first discharge port 30 second discharge part 32 second discharge port 40 Convex portion C Centroid of suction port S Suction direction X Virtual one-dimensional coordinate axis

Claims (10)

a suction unit having a suction port;
One or more first discharge ports arranged radially outside the suction port and configured by an annular port annularly formed around the suction port or a plurality of nozzles annularly arranged around the suction port a first discharge part having
a second discharge portion disposed between the suction port and the first discharge port in the radial direction and having a second discharge port for injecting air along a direction orthogonal to the radial direction ;
The annular port or the first outlet formed by the plurality of nozzles is configured to blow air to form an air curtain around the suction port.
suction device. The second ejection part includes a convex part that protrudes when viewed from the surface on which the suction port is formed,
The suction device according to claim 1, wherein the second ejection port extends along the suction direction of the suction section in the convex portion. The convex portion is formed in an annular shape centering on the suction port,
The second discharge part is arranged discretely in the circumferential direction of the inner circumference of the convex part, and the plurality of the second discharge parts are arranged so as to impart a swirl force in the same direction to the air flow toward the suction port. 3. A suction device according to claim 2, comprising a second outlet. 4. The suction device according to claim 3, wherein the second ejection section is configured to eject at least part of the air ejected from the second ejection port in parallel with a surface on which the suction port is formed. The second discharge section is configured to jet at least part of the air jetted from the second discharge port obliquely toward the upstream side of the flow of air toward the suction port. 5. The suction device according to any one of 4. The second discharge part has a plurality of the second discharge ports arranged at different positions in the circumferential direction of the suction port so as to impart a swirling force in the same direction to the air flow toward the suction port. Item 6. The suction device according to any one of Items 1 to 5. Each of the second discharge parts can jet air toward the centroid when projected onto a virtual one-dimensional coordinate axis that is parallel to the surface on which the suction port is formed and passes through the centroid of the suction port. having the second ejection ports spaced apart,
7. The suction device according to claim 6, wherein each of said second ejection ports is arranged point-symmetrically with respect to the center of said suction port. The suction device according to claim 6 or 7, wherein the plurality of second ejection ports are arranged so that jets of air ejected from the respective second ejection ports do not interfere with each other. The suction device according to any one of claims 1 to 8, wherein the first discharge port is configured to blow out the air so as not to give the air curtain a swirl component centering on the suction port. . a step of sucking air containing an object to be sucked through a suction port;
One or more first discharges configured by an annular port arranged radially outwardly of the suction port and annularly formed around the suction port or a plurality of nozzles annularly arranged around the suction port Blowing air from an outlet to form an air curtain around the suction port;
a step of injecting air along a direction orthogonal to the radial direction from a second outlet disposed between the suction port and the first outlet in the radial direction;
aspiration method with

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