JP7251726B2 - Blower - Google Patents

Description

The present invention relates to blowers.

The applicant of the present application has made various proposals regarding the structure of the stator blades of this type of blower. For example, it is the invention described in JP-A-2016-217306. In brief, a wind tunnel is provided, a stationary blade is provided in this wind tunnel, an annular space is formed between the outer shell of the stationary blade and the inner surface of the wind tunnel, and a static It is a fan with stationary blades on which the blades are supported.

And this time, the fan with stationary blades has been improved. This is a proposal that the wind from the fan (rotating blade) can be efficiently introduced into the annular space because it is bent in the direction of the swirling flow of the fan.

Based on this idea, according to the results of a survey of prior art documents, the following inventions can be cited as "documents in which the shape of the stationary blade is devised to rectify the airflow".

Japanese Patent Laying-Open No. 2015-025425 is an invention in which an L-shaped groove or projection is provided as a guide portion in front of the end of the stationary blade on the outlet side (Document 1).

Further, Japanese Patent Laying-Open No. 2008-261280 includes eight inner stator vanes, eight outer stator vanes, and an annular connecting portion. By changing the size of the inner and outer stator blades, the static pressure - air volume characteristics of the axial fan have been improved. Since the housing is partitioned by the annular connecting portion, the invention relates to the fan with stationary blades of JP-A-2016-217306.

Furthermore, Japanese Patent Application Laid-Open No. 2006-214419 is an invention in which both the air volume and the static pressure are increased when the number of rotating blades (moving blades) and stationary blades (stationary blades) is 7 and 8, respectively. The overview relates to the positional relationship between the moving blade and the stationary blade (Reference 3).
JP 2015-025425 A Japanese Patent Application Laid-Open No. 2008-261280 JP 2006-214419 A

Documents 1 to 3 are all inventions related to stationary blades.

In Document 1, an L-shaped groove guiding portion (51) is provided in front of the end (52) of the nozzle (50) on the outlet side (2) (intake port side 1), so that the airflow is , flow along the guide surface (53) and guide it in the direction of the outlet side (2). As a result, for example, the warping component is suppressed, and the air resistance is also reduced. As a result, the liquid is efficiently discharged to the outside from the outlet while ensuring a rectified flow toward the outlet side (2).

Further, in Document 2, the (radially outer) end of the inner stator vane (241) and the (radial inner) end of the outer stator vane (243) are connected by a connecting part (242). . In addition, the inner surface (421) of the connecting portion (242) has a normal line toward the central axis (J1) inclined toward the rotor portion (222) rather than the stator portion (221), and the connecting portion (242) is , the diameter of which gradually decreases from the intake side to the exhaust side. Therefore, the axial fan (1) obtains a sufficient air collecting effect with the outer stationary blades (243), and suppresses the obstruction of the airflow with the inner stationary blades (241). Static pressure - air volume characteristics can be improved.

Furthermore, in Document 3, the axial flow fan 1 preferably has a structure in which seven rotating blades (5) and eight stationary blades (11) are provided in a housing (3), and an impeller (7 ), a motor (9) with a rotating shaft (8), and the like. The rotating blades (5) have a curved cross-sectional shape in which the recesses open in the direction of rotation of the impeller (7). In addition, the stationary blade (11) has a cross-sectional shape when the stationary blade (11) is cut in a direction orthogonal to the axial direction, and has a curved shape in which the recess opens in the direction opposite to the rotating direction. ing. As a result, it is possible to provide an axial flow fan with a larger air volume and higher static pressure than conventional ones. Further, the present invention provides an axial flow fan capable of reducing noise more than the conventional one.

In view of the above, the present invention increases the number of supports that support the stationary blades, and has a configuration in which the plate surface of the support is curved. Adopt a structure that bends toward As a result, for example, a proposal is made to efficiently introduce the wind from the fan (rotating blades) into the annular space. A preferred example thereof is claims 1-6 .

The invention of claim 1 is a blower comprising a wind tunnel provided on the blowing side of the blower main body and a stationary blade provided inside the wind tunnel,
The stationary blade includes a cylindrical main body (10a) that accommodates the fan of the blower, and the stationary blade includes a plurality of blade plates projecting toward the center of the inner peripheral surface of the wind tunnel, A combination of outer shells suspended on the free ends of the blades ,
Between the outer peripheral surface of the outer shell and the inner peripheral surface of the wind tunnel, there is a passage through which the air from the blower flows,
The wind tunnel and the passage are provided with a suction side and a blowing side through which the air flows ,
The stationary vane provided in the wind tunnel and the support supporting the stationary vane provided in the passage are separated,
Part of the air blown out of the main body of the blower generated by the rotation of the fan can be received in the suction port on the suction side from the direction of swirling flow, is sent to the discharge side, and is sent from the discharge port on the discharge side to the outside. to be able to blow out to
The support has a plate surface through which the air flows, and the suction side of the plate surface has a bent surface that bends in a swirl direction of the blown air,
The bent surface extends from the end of the main body (10a) and forms an angle θ° with respect to the plate surface in the direction of the swirling flow,
The fan rotates clockwise when the main body of the blower is viewed from the front, and the air flows counterclockwise.

Accordingly, in claim 1, the number of supports for supporting the stationary blades is increased, and the plate surface of the support is bent. A structure that bends toward the direction of flow (as viewed by an arrow) is adopted. By adopting this structure, for example, there is a feature that the wind from the fan (rotating blades) can be efficiently introduced into the annular space described later, without the generation of turbulence (no turbulence), and very smoothly.

The invention according to claim 2 is a blower characterized in that the plate surface is straight on the blowing side.

Thus, in claim 2 , it is possible to achieve the feature of claim 1, and to provide the optimal form of the plate surface on the blowout side of the support for achieving the feature of claim 1.

The invention of claim 3 is the fan characterized in that the plate surface is formed from the suction side (10d) of the stationary blade to the blowing side of the stationary blade.

Thereby, in claim 3 , it is possible to achieve the feature of claim 1 and to provide the optimum overall configuration of each support for achieving the feature of claim 1.

The invention of claim 4 is a blower characterized in that the curved surface is formed on the suction side (10d) extending from the end of the main body (10a).

Thus, in claim 4 , it is possible to achieve the feature of claim 1, and it is possible to provide the optimal bending form of the plate surface of each support for achieving the feature of claim 1.

According to the invention of claim 5 , the fan is characterized in that the bend of the plate surface protrudes from the suction side of the passage (the side of the fan main body).

Thus, in claim 5 , it is possible to achieve the feature of claim 1, and the optimal bending form of the plate surface of each support for achieving the feature of claim 1, and the bending discharge structure on the suction side. can provide

In the sixth aspect of the present invention, the blower is an axial fan.

Thus, in claim 6 , the feature of claim 1 can be achieved, and the optimal model of the blower (fan) for achieving the feature of claim 1 can be proposed.

Front view of the whole of the present invention Overall rear view of the present invention Overall plan view of the present invention Right side view of the whole of the present invention Left side view of the whole of the present invention Front view of the stator blade of the present invention (seen from the blowing side) FIG. 2 is an enlarged perspective view of a main part schematically showing the flow of air due to bending of the plate surface of the support (support plate) provided in the wind tunnel of the present invention. FIG. 8 is a cross-sectional view schematically showing the flow of air due to the stationary blade having a curved part (suction side) of the plate surface shown in FIG. 7 in the blower of the present invention; Sectional view of a configuration in which the stator blades of the present invention are arranged in a wind tunnel Schematic diagram for explaining the flow of blown air from the fan (which becomes the intake air when viewed from the stationary blade side) due to the provision of the support plate in FIG. The perspective view which took out one sheet of the support body of this invention, and expanded it and expressed the principal part. An enlarged perspective view schematically showing the flow of air on the plate surface of a conventional support.

A preferred embodiment of the present invention will be described in order below.

The blower 1 (for example, an axial fan) shown in FIGS. 1 to 5 is a preferable example, and the main parts of its configuration are a motor 2 having a cord (not shown) and an outer peripheral surface of the motor 2. and a guard 3 (protective net) made of a wire attached to a flange (not shown) protruding from the motor 2 and a fan 5 (blade, rotor blade) supported on the output shaft 201 of the motor 2 .

In this example, the annular wire rod 300 of the guard 3 has a large diameter on the motor side and a small diameter on the anti-motor side. An example and not a limitation. Reference numeral 301 in the figure denotes a frame wire of the guard 3. As shown in FIG.

In this example, the wind tunnel 7 shown in FIGS. 3 to 5 has an annular (cylindrical) shape. It reaches the outlet 7b1 on the side 7b. In this example, the diameter of the suction side 7a>the diameter of the blowout side 7b is an example. A plurality of supports 8, 8 (brackets) are provided inside the wind tunnel 7 (inner peripheral surface 7c), and by attaching the annular outer shell 10b of the stationary blade 10 to the support 8, The stationary blade 10 is supported by the wind tunnel 7, and a tubular space passage 11 is formed between the inner peripheral surface 7c of the wind tunnel 7 and the outer peripheral surface 10b2 of the outer shell 10b constituting the stationary blade 10. It is formed. The passage 11 is cylindrical and extends from the suction side 7a of the wind tunnel 7 to the blowout side 7b. Further, the passage 11 receives a part of the wind (air blown from the fan 5) generated by the rotation of the fan 5 at the suction port 11a1 on the suction side 11a thereof, sends it to the blowing side 11b, and blows out the blowing side 11b. It blows out from the mouth 11b1 (has a sending feature). The shape of the wind tunnel 7 is similar to the annular outer shape of the guard 3 on the fan side. Alternatively, it is intended for noise reduction or the like, but is not limited.

On the other hand, most of the blowing air is in the space (suction port 10d1) between the inner peripheral surface 10b1 of the outer shell 10b of the stationary blade 10 and the outer peripheral surface 10a1 of the main body, toward the vane plate 10c, toward the suction side 10d of this space. is sent to the blowing side 10e. The air drawn in from the suction port 10d1 of the stationary blade 10 (referred to as an intake air Y) is rectified by the action of the multiple blades 10c of the stationary blade 10, and becomes, for example, a straight air flow, and is blown out. The air is blown out from the mouth 10e1.

In this example, the stationary blade 10 includes an annular (cylindrical) main body 10a having a blind plate on the blowout side, an annular outer shell body 10b (one example) having a smaller diameter than the wind tunnel 7, and an outer peripheral surface 10a1 of the main body . It is composed of several spiral blades 10c provided between the inner peripheral surface 10b1 of the outer shell 10b. Therefore, the air blown from the fan 5 flows from the suction side 10d of the stationary blade 10 to the blowing side 10e. Further, it flows from the suction side 11a of the passage 11 to the blowing side 11b. Alternatively, it flows from the suction side 8a1 of the plate surface 8a to the blowing side (no reference numeral).

The suction side 8a1 of the plate surface 8a of the support body 8 shown in FIGS. As a result, the curved surface 80 is bent toward the swirling flow direction of the intake air Y , for example. By providing the curved surface 80, the air blown from the fan 5 of the blower 1 can be efficiently taken into the wind tunnel 7, and it can contribute to reduction of pressure loss, reduction of noise generation, and the like.

7 to 10, the flow of air from the blower 1 will be described. The fan 5 rotates to generate and blow the air. For example, in FIGS. 8 and 9, much of the wind flows (is pushed) from the intake side 7a of the wind tunnel 7 toward the discharge side 7b. At this time, there are no obstacles on the inner peripheral surface 7c of the wind tunnel 7, and the blades 10c are provided, so that turbulence does not occur. Therefore, it can be expected that the rectified wind will flow smoothly (smooth air blowing), and that the wind speed will not decrease, and that it will reach a long distance. In particular, in FIG. 7, by using a large number (for example, 16) of substantially J-shaped supports 8, the bent surface 80 formed on the suction side 8a1 of the plate surface 8a of the support 8 is the same as that shown in FIG. As shown in FIG. 10, since the fan 5 is positioned closer to the suction side 7a than the stationary blade 10 and forms an angle θ° with respect to the airflow as shown in FIG. , the air flows counterclockwise as shown in FIG. This air is swirled by the rotational force of the fan 5 as shown by arrows, and the flow velocity increases toward the passage 11 (see FIGS. 8 and 9). In particular, a part of the blown air is sucked from the suction port 11a1 of the passage 11 (annular space), and at that time is received by the curved surface 80 of the plate surface 8a of the support 8 (support plate) and Thus, the presence of the passage 11 supplies the maximum amount of air from the fan 5 (this passage 11 can be utilized as a passage for the wind sent into the wind tunnel 7). These comprehensive effects can, for example, expand the field of application. For example, the angle θ° is derived from the relationship with the number of rotations of the fan 5, and even if the number of rotations is low, it can be expected to be about 5°. Therefore, this angle θ° makes a significant difference as the number of revolutions increases. For example, in addition to this comprehensive effect, the generation of noise is less than in the conventional system, and air can be blown over a long distance, thereby expanding the fields of application.

On the other hand, in the support 08 of the conventional example shown in FIG. , the air volume passing through the passage 011 decreases.

Each of the structures, features, etc., described above is an explanation of a preferred example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and structures that partially change the configuration, structures that achieve the same features and effects, etc. within the spirit of the invention fall within the scope of the present invention. is.

Reference Signs List 1 blower 2 motor 3 guard 201 output shaft 300 annular wire 301 frame wire 5 fan (blade)
7 Wind tunnel 7a Suction side 7a1 Suction port 7b Blowout side 7b1 Blowout port 7c Inner peripheral surface 8 Support body 8a Plate surface 8a1 Suction side 80 Bent surface 10 Stationary blade 10a Main body 10a1 Main body outer peripheral surface 10b Outer body 10b1 Inner periphery of outer shell Surface 10b2 Outer peripheral surface of outer shell 10c Wing plate 10d Suction side 10d1 Suction port 10e Blowing side 10e1 Blowing port 11 Passage 11a Suction side 11a1 Suction port 11b Blowing side 11b1 Blowing port Y intake air
08 support 08a vortex 011 passage

Claims (6)

A blower comprising a wind tunnel provided on the blowing side of the blower body and a stationary blade provided inside the wind tunnel,
The stationary blade includes a cylindrical main body (10a) that accommodates the fan of the blower, and the stationary blade includes a plurality of blade plates projecting toward the center of the inner peripheral surface of the wind tunnel, A combination of outer shells suspended on the free ends of the blades ,
Between the outer peripheral surface of the outer shell and the inner peripheral surface of the wind tunnel, there is a passage through which the air from the blower flows,
The wind tunnel and the passage are provided with a suction side and a blowing side through which the air flows ,
The stationary vane provided in the wind tunnel and the support supporting the stationary vane provided in the passage are separated,
Part of the air blown out of the main body of the blower generated by the rotation of the fan can be received in the suction port on the suction side from the direction of swirling flow, is sent to the discharge side, and is sent from the discharge port on the discharge side to the outside. to be able to blow out to
The support has a plate surface through which the air flows, and the suction side of the plate surface has a bent surface that bends in a swirl direction of the blown air,
The bent surface extends from the end of the main body (10a) and forms an angle θ° with respect to the plate surface in the direction of the swirling flow,
1. A blower according to claim 1, wherein said fan rotates clockwise when said blower main body is viewed from the front, and air flows in a counterclockwise direction. 2. The fan according to claim 1 , wherein the plate surface is straight on the blowing side . The fan according to claim 1, wherein the plate surface is formed from the suction side (10d) of the stationary blade to the blowing side of the stationary blade. The fan according to claim 1, wherein the curved surface is formed on the suction side (10d) extending from the end of the body (10a). 2. The fan according to claim 1 , wherein the curved surface of the plate surface protrudes from the suction side of the passage . 2. The blower according to claim 1 , wherein said blower is an axial fan .

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