Double-impeller mixed flow smoke exhaust fan

Abstract

The utility model discloses a double-impeller mixed flow smoke exhaust fan which comprises a shell, a motor is installed in the shell, a first fan blade and a second fan blade are fixed to the two ends of a driving shaft of the motor respectively and located on the two sides of the motor respectively, the first fan blade can convey air to the second fan blade, and the second fan blade can convey air to the second fan blade. The second fan blade can convey air in the opposite direction of the first fan blade, the second fan blade comprises a plurality of blades, and the area of the second fan blade is smaller than that of the first fan blade. Through the arrangement of the second fan blades, wind power compensation can be carried out on a windless space behind the motor, and the conveying distance of wind is effectively increased.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and more specifically to a double-impeller mixed-flow smoke exhaust fan. Background Art

[0002] The current exhaust fan Figure 1 As shown, most of them are composed of a housing 100, a motor 200 is installed inside the housing 100, and a fan blade 300 is installed on the shaft of the motor 200. The fan blade 300 is driven by the motor 200 to rotate, so that the air in front of the fan blade 300 is transported to the rear of the fan blade 300 to achieve a smoke exhaust effect. However, since the fan blade 300 is behind the motor 200, a windless space is formed behind the motor 200, so that a part of the wind around the motor 200 spreads toward the windless space behind the motor 200 after passing the motor 200, resulting in a cross state of wind direction behind the motor 200 ( Figure 1 The direction of the arrow in the middle is the wind direction), which greatly affects the wind transmission distance, so it is urgent to improve this. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and to provide a double-impeller mixed flow smoke exhaust fan which, by providing a second fan blade, can compensate for the windless space behind the motor and effectively increase the wind transport distance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a double-impeller mixed-flow smoke exhaust fan, comprising a shell, a motor is installed inside the shell, a first fan blade and a second fan blade are respectively fixed at both ends of a driving shaft of the motor, the first fan blade and the second fan blade are respectively located on both sides of the motor, the first fan blade can transport wind to the second fan blade, and the second fan blade can transport wind in the opposite direction of the first fan blade, the second fan blade includes a plurality of blades, and the area of ​​the second fan blade is smaller than that of the first fan blade.

[0006] Furthermore, the second fan blade includes a connecting block, the connecting block is fixedly connected to the driving shaft of the motor, and the blades are evenly fixedly connected to the circumference of the connecting block.

[0007] Furthermore, the cross section of the connection block is a regular polygon, and each plane of the connection block is connected to a blade.

[0008] Furthermore, a side surface of the connection block is provided with a limiting groove corresponding to the blade, and the blade includes a limiting block, and the limiting block is inserted into the limiting groove and fixed.

[0009] Furthermore, the limiting block is a regular polygon, and the contour of the limiting groove is consistent with the contour of the limiting block.

[0010] Furthermore, the regular polygon of the limiting block is at least a regular decagon.

[0011] Furthermore, the blade is connected to the connection block via a first bolt, each surface around the limit block is provided with a threaded hole, and one end of the first bolt is inserted into the connection block and can be threadedly connected to the threaded hole at a corresponding position.

[0012] Furthermore, an extension piece is connected to the surface of the blade, and the extension piece is connected to the blade via a second bolt.

[0013] The beneficial effects of the utility model are:

[0014] 1. When the motor is working, the second fan blade rotates behind the motor, which can solve the problem of windless space behind the motor, thereby solving the problem that the wind delivered by the first fan blade enters the windless space after passing through the motor. The second fan blade provides air supply compensation, making the air supply smoother, greatly increasing the air delivery distance, and thus improving the smoke exhaust effect;

[0015] 2. By setting regular polygonal limit blocks and limit grooves, the blades can be fixed at different angles, thereby changing the air supply direction of the second fan blade during rotation, and then better adjusting the wind compensation for the first fan blade, greatly improving the air supply distance and quality; by setting an extension piece, the overall expansion size of the second fan blade can be changed, thereby further adjusting the wind compensation for the first fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prior art;

[0017] Figure 2 is a schematic diagram of the structure of this embodiment at a first viewing angle;

[0018] Figure 3 It is a schematic diagram of the structure of the utility model at a second viewing angle;

[0019] Figure 4 It is a structural schematic diagram of the air supply mechanism;

[0020] Figure 5 This is a schematic diagram of the mechanism of the second fan blade.

[0021] Figure numerals: housing 1, motor 2, first fan blade 3, second fan blade 4, connecting block 5, limiting groove 51, blade 6, limiting block 61, threaded hole 62, first bolt 7, extension piece 8, second bolt 9. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figures 2 to 5 As shown, a double-impeller mixed flow smoke exhaust fan comprises a housing 1, a motor 2 is installed inside the housing 1, a first fan blade 3 and a second fan blade 4 are respectively fixed at both ends of the driving shaft of the motor 2, the first fan blade 3 and the second fan blade 4 share a driving shaft, that is, the motor 2 can synchronously drive the first fan blade 3 and the second fan blade 4 to rotate when working, the first fan blade 3 and the second fan blade 4 are respectively located on both sides of the motor 2, the first fan blade 3 can transport wind to the second fan blade 4, the second fan blade 4 can transport wind in the opposite direction of the first fan blade 3, and the second fan blade 4 includes a connecting block 5 and a plurality of blades 6, the connecting block 5 is fixedly connected to the driving shaft of the motor 2, the blades 6 are evenly fixedly connected to the circumference of the connecting block 5, the area of ​​the second fan blade 4 is smaller than the area of ​​the first fan blade 3, when the motor 2 is working, the second fan blade 4 rotates behind the motor 2, so as to solve the problem of the windless space behind the motor 2, thereby solving the problem that the wind transported by the first fan blade 3 enters the windless space after passing through the motor 2, and provides air supply compensation through the second fan blade 4, so that the air supply is smoother, which greatly improves the air transport distance and thus improves the smoke exhaust effect.

[0024] The side of the connecting block 5 is provided with a limiting groove 51 corresponding to the blade 6, and the blade 6 includes a limiting block 61, and the limiting block 61 is inserted into the limiting groove 51 and fixed. The blade 6 is connected to the connecting block 5 by a first bolt 7. Through this design, a detachable design of the blade 6 is realized, which facilitates the replacement of the blade 6.

[0025] The cross section of the connecting block 5 is a regular polygon, and each plane of the connecting block 5 is connected to a blade 6, that is, the number of faces of the connecting block 5 is consistent with the number of blades 6. In the utility model, the connecting block 5 is a regular pentahedron, which is equivalent to being provided with five blades 6. By providing a regular polygonal connecting block 5, the connection between the connecting block 5 and the blades 6 can be facilitated.

[0026] The limit block 61 is a regular polygon, and the contour of the limit groove 51 is consistent with the contour of the limit block 61. Specifically, the regular polygon of the limit block 61 is at least a regular decagon. In the utility model, the limit block 61 is a regular dodecahedron. By setting the regular polygonal limit block 61 and the limit groove 51, the blade 6 can be fixed at different angles, thereby changing the air supply direction of the second fan blade 4 when rotating, and then better adjusting the wind compensation for the first fan blade 3, greatly improving the air supply distance and improving the quality.

[0027] Among them, each surface around the limit block 61 is provided with a threaded hole 62, one end of the first bolt 7 is inserted into the connecting block 5 and can be threadedly connected with the threaded hole 62 at the corresponding position. When the angle of the blade 6 is adjusted, the blade 6 can be fixedly connected to the connecting block 5 through the first bolt 7, making the connection more reliable.

[0028] The surface of the blade 6 is connected with an extension piece 8, and the extension piece 8 is connected to the blade 6 via a second bolt 9. By providing the extension piece 8, the overall unfolded size of the second fan blade 4 can be changed, thereby further adjusting the wind compensation for the first fan blade 3.

[0029] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A double-impeller mixed flow smoke exhaust fan, characterized in that: The invention comprises a housing (1), wherein a motor (2) is installed inside the housing (1), and a first fan blade (3) and a second fan blade (4) are respectively fixed at both ends of a driving shaft of the motor (2), the first fan blade (3) and the second fan blade (4) are respectively located on both sides of the motor (2), the first fan blade (3) can transport wind to the second fan blade (4), and the second fan blade (4) can transport wind in the opposite direction of the first fan blade (3), the second fan blade (4) comprises a plurality of blades (6), and the area of ​​the second fan blade (4) is smaller than the area of ​​the first fan blade (3).

2. A double-impeller mixed flow smoke exhaust fan according to claim 1, characterized in that: The second fan blade (4) comprises a connecting block (5), the connecting block (5) is fixedly connected to the driving shaft of the motor (2), and the blades (6) are evenly fixedly connected to the circumference of the connecting block (5).

3. A double-impeller mixed flow smoke exhaust fan according to claim 2, characterized in that: The cross section of the connection block (5) is a regular polygon, and each plane of the connection block (5) is connected to a blade (6).

4. A double-impeller mixed flow smoke exhaust fan according to claim 3, characterized in that: A limiting groove (51) corresponding to the blade (6) is provided on the side of the connection block (5); the blade (6) comprises a limiting block (61); and the limiting block (61) is inserted into the limiting groove (51) and fixed.

5. A double-impeller mixed flow smoke exhaust fan according to claim 4, characterized in that: The limiting block (61) is a regular polygon, and the contour of the limiting groove (51) is consistent with the contour of the limiting block (61).

6. A double-impeller mixed flow smoke exhaust fan according to claim 5, characterized in that: The regular polygon of the limiting block (61) is at least a regular decagon.

7. A double-impeller mixed flow smoke exhaust fan according to claim 4, characterized in that: The blade (6) is connected to the connection block (5) via a first bolt (7); each surface of the circumferential side of the limit block (61) is provided with a threaded hole (62); one end of the first bolt (7) is inserted into the connection block (5) and can be threadedly connected to the threaded hole (62) at a corresponding position.

8. The double-impeller mixed flow smoke exhaust fan according to claim 1, characterized in that: An extension piece (8) is connected to the surface of the blade (6), and the extension piece (8) is connected to the blade (6) via a second bolt (9).

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