A plenum blower

Abstract

The utility model discloses a kind of pressure-increasing flow guide fan, which is erected between outer cylinder and fixed cylinder or outer cylinder and motor by spiral support plate, outer side fixed plate and inner side fixed plate are provided on the plate body of spiral support plate, after plate body and outer side fixed plate are welded, reinforcing plane is provided between the two for overall reinforcement, after plate body and inner side fixed plate are welded, extension is provided at windward surface gap, the extension extends to the outer diameter of motor, the above structure plugs the air-permeable gap of windward surface, avoids pressure relief in fan blade pressure-increasing stage, the airflow extruded by plate body arranged spirally can be secondly extruded, wind pressure can be effectively improved under the action of double extrusion, the structure does not need to increase driving power, noise also cannot be increased and changed.

Description

Technical Field

[0001] This utility model relates to the field of booster fan technology, specifically to a booster flow guiding fan. Background Technology

[0002] In the existing fan industry, fans that operate on the principle of axial airflow include axial flow fans, mixed flow fans, smoke exhaust fans, and mixed flow fans. When these fans are running, the rotation direction of the fan is parallel to or not at a right angle to the airflow direction.

[0003] However, while existing fans of this type have relatively stable performance during operation, they have technical drawbacks in terms of air pressure and air volume. These drawbacks are mainly reflected in the fact that these fans can only achieve low air pressure operating scenarios, and the air pressure of the fans cannot be increased within a certain range, resulting in a power output bottleneck for these fans. Current technology usually increases air pressure by increasing the rotation speed, but this adjustment method not only increases the drive power but also increases noise. Some manufacturers also increase air pressure by adjusting the number of blades, which also increases the drive power and noise.

[0004] As a research and development unit in the field of ventilation equipment, the most pressing technical problem to be solved is: how to design a fan structure that can improve the existing fan assembly structure and increase air pressure without increasing the driving power. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a booster fan that improves the fixing structure of the fan so that the existing fan fixing plate has better flow guiding function, so that it not only supports the motor, but also achieves the boosting effect.

[0006] The specific technical solution adopted in this utility model is as follows: A booster fan includes an outer cylinder, a fan, and several blades; several external fixing holes are provided on the inner wall of the outer cylinder; a spiral support plate is provided between the fan and the outer cylinder. The spiral support plate is inclined, either left-handed or right-handed. The spiral support plate includes a plate body, an outer fixing plate, and an inner fixing plate. The plate body is fixed to the outer fixing plate and the inner fixing plate as a whole. The inner fixing plate is connected to a fixing point on the outer wall of the motor or the motor fixing cylinder, and the outer fixing plate is connected to an outer fixing hole on the outer cylinder.

[0007] After the plate is welded to the outer and inner fixing plates, a reinforcing plane is provided between them. After the plate is welded to the inner fixing plate, an extension is provided at the gap on the windward side, extending to the outer diameter of the motor. This design seals the air gap on the windward side, preventing pressure loss during the fan blade pressurization phase.

[0008] The outer cylinder is provided with an outwardly expanding windproof cover at its front end. The outwardly expanding windproof cover is flared in shape. A flange reinforcement edge is provided on the outer diameter of the outwardly expanding windproof cover. The flange reinforcement edge is provided with a covering surface that fits and is fixed to the outwardly expanding windproof cover. The fan blade is fixed on the guide shield, which is conical in shape.

[0009] The outer cylinder is a modular structure, with two or more components connected by flanges. Supports are fixed at the connection points or inside the components. External fixing holes are provided on the support or the supported fixing components to fix the spiral support plate.

[0010] The beneficial effects of this utility model are as follows: With the above structural configuration, this utility model is supported by a spiral support plate between the outer cylinder and the fixed cylinder, or between the outer cylinder and the motor. The spiral support plate has an outer fixing plate and an inner fixing plate. After welding the plate to the outer fixing plate, a reinforcing plane is provided between them for overall reinforcement. After welding the plate to the inner fixing plate, an extension is provided at the gap on the windward side, extending to the outer diameter of the motor. This structure seals the air gap on the windward side, preventing pressure leakage during the fan blade pressurization stage. The spirally arranged plate can further compress the airflow squeezed by the fan blades, effectively increasing the wind pressure under the double compression effect. This structure does not require increased drive power, and the noise level remains unchanged. This structure is applicable to axial flow fans, mixed flow fans, and smoke exhaust fans. Laboratory test data shows that this modification can increase the wind pressure of fans with the same structure by 10%, making it an ideal pressurized and guided flow fan. Attached Figure Description

[0011] The structure of the device of this utility model will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the front-end three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the fan's fixed structure; Figure 3 yes Figure 2 Enlarged schematic diagram of the structure of region A in the middle; Figure 4 This is a schematic diagram of the internal cross-sectional structure of an axial flow fan; Figure 5 This is a schematic diagram of the three-dimensional structure of a mixed-flow fan; Figure 6 This is a schematic diagram of the internal cross-sectional structure of a mixed-flow fan; Figure 7 This is a schematic diagram of the internal cross-sectional structure of a mixed-flow fan; Figure 8 This is a schematic diagram of the internal cross-sectional structure of the smoke exhaust fan; 1. Outer cylinder; 11. Flange flange; 12. Outer fixing block; 13. Left side; 14. Right side; 15. Outer fixing hole; 2. Fan blade; 3. Motor; 31. Inner fixing block; 4. Draft shield; 5. Spiral support plate; 51. Inner fixing plate; 52. Inner reinforcing surface; 53. Plate body; 54. Extension; 55. Outer fixing plate; 56. Outer reinforcing surface; 6. Outwardly expanding windproof shield; 61. Flange reinforcing edge; 62. Covering surface; 63. Draft section; 7. Support component; 8. Motor fixing cylinder. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings.

[0014] Example 1: A booster fan includes an outer cylinder 1, a fan 3, and several fan blades 2. A guide shroud 4 is fixed to the end of the fan 3, and several fan blades 2 are fixed on the guide shroud 4. Multiple spiral support plates 5 are provided between the fan 3 and the outer cylinder 1. Each spiral support plate 5 includes a plate body 53, an outer fixing plate 55, and an inner fixing plate 51. The plate body 53 is fixed to the outer fixing plate 55 and the inner fixing plate 51 as a single unit. The inner fixing plate 51 is connected to an inner fixing block 31 on the outer wall of the motor 3 or the motor fixing cylinder 8. The outer fixing plate 55 is connected to an outer fixing hole on the outer cylinder 1. It should be noted that the plate body 53 of the spiral support plate 5 is arranged in an inclined spiral configuration, which can be either left-handed or right-handed. When setting these two structures, the left-handed or right-handed inclination must be in the same direction as the spiral inclination of the fan blades 2.

[0015] like Figure 1 , 2 As shown in Figures 3 and 4, when this structure is applied to an axial flow fan, the plate 53 is welded to the outer fixing plate 55 and the inner fixing plate 51 as a whole, and a reinforcing plane is provided between them. For example, an outer reinforcing surface 56 is provided between the plate 53 and the outer fixing plate 55, and an inner reinforcing surface 52 is provided between the plate 53 and the inner fixing plate 51. The function of the inner reinforcing surface 52 and the outer reinforcing surface 56 is to increase the fixing area with the plate and improve the overall stability and strength.

[0016] Furthermore, such as Figure 3As shown, after the plate 53 is welded to the inner fixing plate 51, an extension 54 is provided at the gap on the windward side, and the extension 54 extends to the outer diameter of the motor 3. This design seals the air gap on the windward side, preventing pressure loss during the pressurization stage of the fan blade 2, and can effectively improve the wind pressure intensity.

[0017] With the above structure, the spiral plate 53 can perform secondary compression of the airflow squeezed by the fan blade 2. Under the action of double compression, the wind pressure can be effectively increased. This structure does not require an increase in driving power, and the noise will not increase or change.

[0018] Example 2: Based on the structure of Example 1, such as Figure 5 , 6 As shown, when this structure is applied to a mixed-flow fan, an outward-expanding windproof shroud 6 is provided on the flange flange 11 at the front end of the outer cylinder 1. The outward-expanding windproof shroud 6 is flared, and a flange reinforcing edge 61 is provided on the outer diameter of the outward-expanding windproof shroud 6. A covering surface 62 is provided on the flange reinforcing edge 61 and is riveted and fixed to the outward-expanding windproof shroud. A guide section 63 is also provided at the rear end of the outward-expanding windproof shroud 6, extending into the interior of the outer cylinder 1 to ensure that the airflow does not leak out during transportation. The fan blade 2 is fixed on the guide shroud 4, which is conical. With this structure, the airflow first passes through the outward-expanding windproof shroud 6 to achieve external airflow convergence before entering the interior of the outer cylinder 1. After increasing the air pressure, the airflow is further expanded by the guide shroud 4 to achieve airflow in a conical shape inside the outer cylinder 1, which can increase the mixing effect while maintaining the pressure increase stability.

[0019] Example 3: Based on the above examples, such as... Figure 7 As shown, when this structure is applied to a mixed-flow fan, to improve the mixed-flow effect, the outer cylinder 1 is designed as a combined structure. In this embodiment, two components are connected by flanges. The two components are the left side part 13 and the right side part 14. A support member 7 is fixed at the connection point of the left side part 13 and the right side part 14 through the flange edge. An outer fixing block 12 is fixed on the support member 7. The outer fixing block 12 is provided with an outer fixing hole 15, which is used to fix the spiral support plate 5. At this time, the structure of the flow guide shroud 4 is set as a conical surface as in embodiment 2. This flow guide shroud 4 structure, together with the centrally protruding outer cylinder 1, fixes the mixed-flow fan and can increase pressure while stably achieving mixed-flow output.

[0020] Example 4: Based on Example 1 above, as follows Figure 7 As shown, when this structure is applied to a smoke exhaust fan, the motor 3 is fixed inside the motor fixing cylinder 8, and an inner fixing block 31 is set on the outer wall of the motor fixing cylinder 8 to fix the spiral support plate 5. It can also achieve a good pressurization effect on the smoke exhaust fan.

Claims

1. A booster fan, characterized in that: It includes an outer cylinder, a fan, and several fan blades; a spiral support plate is provided between the fan and the outer cylinder; the spiral support plate is inclined, either to the left or to the right. The spiral support plate includes a plate body, an outer fixing plate, and an inner fixing plate. The plate body is fixed to the outer fixing plate and the inner fixing plate as a whole. The inner fixing plate is connected to a fixing point on the outer wall of the motor or the motor fixing cylinder, and the outer fixing plate is connected to an outer fixing hole on the outer cylinder.

2. The booster fan according to claim 1, characterized in that: After the plate is welded to the outer fixing plate and the inner fixing plate, a reinforcing plane is provided between them; after the plate is welded to the inner fixing plate, an extension is provided at the gap on the windward side, and the extension extends to the outer diameter of the motor.

3. A booster fan according to claim 1 or 2, characterized in that: The outer cylinder is provided with an outwardly expanding windproof cover at its front end. The outwardly expanding windproof cover is flared in shape. A flange reinforcement edge is provided on the outer diameter of the outwardly expanding windproof cover. The flange reinforcement edge is provided with a covering surface that fits and is fixed to the outwardly expanding windproof cover. The fan blade is fixed on the guide shield, which is conical in shape.

4. A booster fan according to claim 1 or 2, characterized in that: The outer cylinder is a modular structure, with two or more components connected by flanges. Supports are fixed at the connection points or inside the components. External fixing holes are provided on the support or the supported fixing components to fix the spiral support plate.

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