air supply fan

Abstract

This invention provides a blower, including a duct and a fan assembly located within the duct. The fan assembly includes an impeller. The duct has a cylindrical inner wall with an annular groove extending outward along the diameter of the duct and coaxially arranged with the duct. The rotation axis of the impeller is coaxial with the annular groove, and the axial position of the impeller corresponds to the axial position of the annular groove. This invention allows for a smaller gap between the impeller and the inner wall of the cylindrical inner wall on both the inlet and outlet sides, significantly increasing the static pressure of the blower, thereby improving the air delivery distance and also increasing the air volume.

Description

Technical Field

[0001] This utility model belongs to the field of fan design technology, specifically relating to a blower. Background Technology

[0002] As livestock fans continue to evolve towards higher efficiency and lower noise, the optimized design of the duct system and fan structure has become a key aspect in improving overall performance. Traditional duct structures mostly adopt a straight-cylinder design, which, while achieving airflow guidance, often faces technical bottlenecks such as high wind resistance, uneven airflow distribution, low fan static pressure, and short air delivery distance. To address at least some of the aforementioned technical shortcomings, this utility model is proposed. Utility Model Content

[0003] Therefore, this utility model provides a blower that can overcome the shortcomings of the related technology, such as the large gap between the straight-tube blower and the blades, which leads to low static pressure and short air delivery distance.

[0004] To address the aforementioned problems, this utility model provides a blower, comprising a blower duct and a fan blade assembly located within the blower duct. The fan blade assembly includes an impeller. The blower duct has a cylindrical inner wall with an annular groove that extends outward along the diameter of the blower duct and is coaxially arranged with the blower duct. The rotation axis of the impeller is coaxially arranged with the annular groove, and the axial position of the impeller corresponds to the axial position of the annular groove.

[0005] In some embodiments, the diameter of the impeller is equal to the diameter of the cylindrical inner wall.

[0006] In some embodiments, the groove depth of the annular groove is t, where t < 10 mm.

[0007] In some embodiments, the fan assembly further includes a motor and a mounting bracket, the impeller is connected to the shaft of the motor, the mounting bracket includes a horizontal plate, both ends of the horizontal plate are fixedly connected to the inner wall of the cylindrical cylinder, and the motor is assembled on the top surface of the horizontal plate.

[0008] In some embodiments, the mounting bracket further includes a vertical plate, one end of which is fixedly connected to the bottom surface of the horizontal plate, and the other end of which is fixedly connected to the cylindrical inner wall, with the horizontal plate and the vertical plate forming a T-shape.

[0009] In some embodiments, the end of the motor near the air inlet port of the air duct is an arc surface, and the arc surface protrudes towards the side of the air inlet port of the air duct.

[0010] In some embodiments, the air inlet of the air duct is provided with an annular air guide shroud, which has a flared structure and the flow diameter of the flared structure gradually decreases in the direction of airflow.

[0011] In some embodiments, the air inlet of the duct is formed with an arc-shaped flange that gradually widens toward the annular air guide shroud, and the annular air guide shroud is detachably assembled onto the arc-shaped flange.

[0012] In some embodiments, the air outlet of the air duct is formed with a mounting flange that protrudes outward along the diameter of the air duct.

[0013] In some embodiments, the impeller includes a hub and a plurality of blades disposed on the radially outer periphery of the hub, the blades being bow-shaped blades.

[0014] The air supply fan provided by this utility model has the following beneficial effects: A convex (i.e., recessed outwards along the diameter of the duct) annular groove is provided on the cylindrical inner wall of a traditional straight duct, and the impeller of the fan assembly is positioned in the space enclosed by the annular groove. This allows for a larger outer diameter of the impeller while avoiding contact and interference with the cylindrical inner wall. Consequently, the gaps between the impeller and the inner walls of the cylindrical inner wall on both the inlet and outlet sides can be designed to be smaller. This significantly increases the static pressure of the fan, thereby increasing the air delivery distance and also improving the air volume. It is worth noting that the aforementioned annular groove can increase the static pressure of the air inside the duct, thereby improving static pressure efficiency and making the overall efficiency of the fan higher at high static pressure. The impeller diameter is designed to be equal to the diameter of the cylindrical inner wall, which maximizes the impeller diameter while ensuring smooth assembly of the impeller inside the air duct, and minimizes the gap between the impeller and the cylindrical inner wall, thus ensuring that the performance of the air supply fan is in a better state. The motor is placed on the top surface of the horizontal plate, and the two ends of the horizontal plate are fixedly connected to the cylindrical inner wall. This allows the horizontal plate to reliably assemble and fix the motor, while also providing reliable support for the opposite sides of the air duct. This improves the structural stability of the air duct and enhances its resistance to deformation, making it particularly suitable for scenarios with a large inner diameter of the air duct. Further installing vertically arranged plates on the bottom surface of the horizontal plate can improve the structural stability of the horizontal plate and effectively prevent the downward bending deformation of the middle of the horizontal plate due to excessive assembly loads of motors and impellers. It is also worth noting that the T-shape formed by the horizontal plate and the vertical plate can minimize the obstruction to the airflow, ensuring the air intake and delivery volume while making the structural layout inside the duct more reasonable and reliable. Designing the end of the motor facing the air inlet of the duct as an arc surface can reduce the resistance of the incoming airflow and improve the uniformity of airflow and the efficiency of air intake. The air outlet of the annular air guide is a small circle and the air inlet is a large circle. This design, which is larger at the front and smaller at the back along the direction of airflow introduction, can further increase the static pressure of the fluid and reduce the resistance of airflow, thereby increasing the air intake efficiency. By setting an arc-shaped flange at the air inlet of the air duct, the arc-shaped flange can serve as a connection carrier with the annular air guide shroud on the one hand, and further guide the airflow to ensure smooth air intake on the other hand. The fan blades are designed with an arc shape, which increases the sweeping area of ​​the blades. The arc shape forms a certain angle with the horizontal line. The appropriate angle can make the fan blades more efficient, further improving the air intake and air delivery efficiency of the blower. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the internal structure of the air supply fan in this embodiment of the utility model, with the air supply direction from left to right; Figure 2 yes Figure 1 The left view; Figure 3 yes Figure 1 A schematic diagram of the air duct and annular air guide in the assembled state.

[0017] The attached figures are labeled as follows: 1. Air duct; 11. Cylindrical inner wall; 111. Annular groove; 112. Arc flange; 113. Mounting flange; 21. Impeller; 211. Hub; 212. Fan blade; 22. Motor; 23. Mounting bracket; 231. Horizontal plate; 232. Vertical plate; 24. Fan blade fixing component; 3. Annular air guide cover. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0022] See also Figures 1 to 3As shown in the figure, according to an embodiment of the present invention, a blower is provided, including a blower duct 1 and a fan blade assembly (not indicated in the figure) located inside the blower duct 1. The fan blade assembly includes an impeller 21. The blower duct 1 has a cylindrical inner wall 11. The cylindrical inner wall 11 has an annular groove 111 that extends outward along the diameter direction of the blower duct 1 and is coaxially arranged with the blower duct 1. The rotation axis of the impeller 21 is coaxially arranged with the annular groove 111, and the axial position of the impeller 21 corresponds to the axial position of the annular groove 111. It is understood that at least the maximum diameter position of the impeller 21 is located within the space surrounded by the annular groove 111.

[0023] In this technical solution, an outwardly protruding (i.e., recessed outwards along the diameter of the duct 1) annular groove 111 is provided on the cylindrical inner wall 11 of a traditional straight duct. The impeller 21 of the fan assembly is positioned within the space enclosed by the annular groove 111. This allows for a larger outer diameter of the impeller 21 while avoiding contact and interference with the cylindrical inner wall 11 (diameter D). Consequently, the gaps between the impeller 21 and the inner walls of the cylindrical inner wall 11 on both the inlet and outlet sides can be designed to be smaller. This significantly increases the static pressure of the fan, thereby increasing the air delivery distance and also improving the air volume. It is worth noting that the aforementioned annular groove 111 can enhance the accumulation of air within the duct to form static pressure, thereby improving static pressure efficiency and resulting in higher overall efficiency of the fan at high static pressure.

[0024] In some embodiments, the diameter of the impeller 21 is equal to the diameter of the cylindrical inner wall 11. It is understood that the diameter of the impeller 21 is also the maximum diameter of the outer edge of the impeller 21.

[0025] In this technical solution, the diameter of the impeller 21 is designed to be equal to the diameter of the cylindrical inner wall 11. This ensures smooth assembly of the impeller 21 within the air duct 1 while maximizing the diameter of the impeller 21, thus minimizing the gap between the impeller 21 and the cylindrical inner wall 11, and ensuring that the performance of the air supply fan is in a superior state.

[0026] In some embodiments, the groove depth of the annular groove 111 is t, where t < 10 mm.

[0027] In this technical solution, the groove depth of the annular groove 111 is designed to be less than 10mm, which can ensure the working efficiency of the blower. The test results show that when the groove depth of the annular groove 111 is not less than 10mm, the working efficiency of the blower tends to decrease.

[0028] The connection between the aforementioned annular groove 111 and the cylindrical inner wall 11 is rounded. In a specific embodiment, the length of the annular groove 111 in the axial direction of the air duct 1 is consistent with the length of the fan blade 212 in the axial direction of the air duct 1.

[0029] In some embodiments, the fan assembly further includes a motor 22 and a mounting bracket 23, the impeller 21 is connected to the shaft of the motor 22, the mounting bracket 23 includes a horizontal plate 231, the two ends of the horizontal plate 231 are fixedly connected to the cylindrical inner wall 11, and the motor 22 is assembled (connected by screws) on the top surface of the horizontal plate 231.

[0030] In this technical solution, the motor 22 is placed on the top surface of the horizontal plate 231, and the two ends of the horizontal plate 231 are fixedly connected to the cylindrical inner wall 11. This allows the horizontal plate 231 to reliably assemble and fix the motor 22 while also providing reliable support to the opposite sides of the air duct 1. This improves the structural stability of the air duct 1 and enhances its resistance to deformation, making it particularly suitable for scenarios with a large inner diameter of the air duct 1.

[0031] In some embodiments, the mounting bracket 23 further includes a vertical plate 232, one end of which is fixedly connected to the bottom surface of the horizontal plate 231, and the other end of which is fixedly connected to the cylindrical inner wall 11, and the horizontal plate 231 and the vertical plate 232 form a T-shape.

[0032] In this technical solution, a vertically arranged vertical plate 232 is further provided on the bottom surface of the horizontal plate 231, which can improve the structural stability of the horizontal plate 231 and effectively prevent the phenomenon of downward bending deformation of the middle part of the horizontal plate 231 due to excessive assembly loads such as motor 22 and impeller 21. It is also worth noting that the T-shape formed by the horizontal plate 231 and the vertical plate 232 can minimize the obstruction to the airflow, ensuring the air intake and delivery volume, while making the structural arrangement inside the air duct 1 more reasonable and reliable.

[0033] The aforementioned horizontal plate 231 and vertical plate 232, as well as the horizontal plate 231 and vertical plate 232 and the cylindrical inner wall 11, can all be connected by corresponding screws with a diameter of 6~10mm to ensure the reliability of the connection.

[0034] In some embodiments, the end of the motor 22 near the air inlet of the air duct 1 is an arc surface, and the arc surface protrudes towards the air inlet of the air duct 1. In one specific embodiment, the aforementioned arc surface is a hemispherical surface. It is understood that the motor 22 has a rotating shaft (not labeled in the figure), and the aforementioned impeller 21 is fixed to the free end of the rotating shaft. In some specific embodiments, the diameter of the aforementioned rotating shaft is 20~24mm.

[0035] In this technical solution, the end of the motor 22 facing the air inlet of the air duct 1 is designed as an arc surface, which can reduce the resistance of the airflow and improve the uniformity of the airflow and the air intake efficiency.

[0036] In some embodiments, the air inlet of the air duct 1 is provided with an annular air guide shroud 3, which has a flared structure, and the diameter of the flared structure gradually decreases in the direction of airflow. See [reference needed]. Figure 1 As shown, the outer wall of the flared mouth smoothly shrinks from diameter D1 to diameter D2 along an arc with radius R.

[0037] In this technical solution, the air outlet of the annular air guide shroud 3 (i.e. Figure 1 The right end shown is a small circle, the air inlet (i.e. Figure 1 The left end shown is a large circle. This design, which is larger at the front and smaller at the back along the direction of airflow introduction, can further increase the static pressure of the fluid and reduce the resistance of airflow, thereby increasing the air intake efficiency.

[0038] In some embodiments, the air inlet of the air duct 1 has an arcuate flange 112 that gradually widens towards the annular air guide shroud 3. The annular air guide shroud 3 is detachably assembled onto the arcuate flange 112, and the radius of the aforementioned arcuate flange 112 is as follows: Figure 1 As shown in r, the aforementioned annular air guide shroud 3 can be connected to the arc flange 112 by 4 to 8 screws.

[0039] In this technical solution, an arc-shaped flange 112 is set at the air inlet of the air duct 1. The arc-shaped flange 112 can serve as a connection carrier with the annular air guide shroud 3 on the one hand, and further guide the airflow to ensure smooth air intake on the other hand.

[0040] In some specific embodiments, the wall thickness of the annular air guide shroud 3 is 5~8mm, making the structure lighter and easier to transport.

[0041] In some embodiments, the air outlet of the air duct 1 is provided with a mounting flange 113 that protrudes outward along the diameter of the air duct 1, so as to fix the air duct 1 to the external mounting carrier as a whole. It is understood that, in a specific embodiment, the aforementioned mounting flange 113 is provided with a plurality of screw holes (not shown in the figure), the screw holes having a diameter of 8~12mm, which can be used to mount the air supply fan on the wall, that is, the mounting flange 113 serves to fix the air duct 1 to the wall surface of the factory area.

[0042] In some embodiments, the impeller 21 includes a hub 211 and a plurality of fan blades 212 disposed on the radially outer periphery of the hub 211. Specifically, the impeller 21 is fitted onto the free end of the shaft of the motor 22 via the hub 211, and the hub 211 is reliably positioned axially and circumferentially by the shaft shoulder and fan blade fixing parts 24 (such as bolts). The fan blades 212 are bow-shaped fan blades. In some specific embodiments, the number of the aforementioned fan blades 212 is 3 to 7.

[0043] In this technical solution, the fan blade 212 adopts an arc-shaped fan blade, which can increase the sweeping area of ​​the fan blade. The arc-shaped fan blade forms a certain angle with the horizontal line. The appropriate angle can make the fan blade more efficient, further improving the air intake and air delivery efficiency of the blower.

[0044] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A supply air blower characterized by, The device includes a duct (1) and a fan blade assembly located within the duct (1). The fan blade assembly includes an impeller (21). The duct (1) has a cylindrical inner wall (11). The cylindrical inner wall (11) has an annular groove (111) that extends outward along the diameter of the duct (1) and is coaxially arranged with the duct (1). The rotation axis of the impeller (21) is coaxially arranged with the annular groove (111), and the axial position of the impeller (21) corresponds to the axial position of the annular groove (111).

2. The air supply fan according to claim 1, characterized in that, The diameter of the impeller (21) is equal to the diameter of the cylindrical inner wall (11).

3. The air supply fan according to claim 1, characterized in that, The groove depth of the annular groove (111) is t, where t < 10 mm.

4. The air supply fan according to claim 1, characterized in that, The fan blade assembly also includes a motor (22) and a mounting bracket (23). The impeller (21) is connected to the shaft of the motor (22). The mounting bracket (23) includes a horizontal plate (231). The two ends of the horizontal plate (231) are fixedly connected to the cylindrical inner wall (11). The motor (22) is assembled on the top surface of the horizontal plate (231).

5. The air supply fan according to claim 4, characterized in that, The mounting bracket (23) also includes a vertical plate (232), one end of which is fixedly connected to the bottom surface of the horizontal plate (231), and the other end of which is fixedly connected to the cylindrical inner wall (11), and the horizontal plate (231) and the vertical plate (232) form a T-shape.

6. The air supply fan according to claim 4, characterized in that, The end of the motor (22) near the air inlet port of the air duct (1) is an arc surface, and the arc surface protrudes towards the air inlet port of the air duct (1).

7. The air supply fan according to claim 1, characterized in that, The air inlet of the air duct (1) is provided with an annular air guide hood (3), which is a horn-shaped structure, and the flow diameter of the horn-shaped structure gradually decreases in the direction of airflow.

8. The air supply fan according to claim 7, characterized in that, The air inlet of the air duct (1) has an arc-shaped flange (112) that gradually expands toward the side of the annular air guide shroud (3), and the annular air guide shroud (3) is detachably assembled onto the arc-shaped flange (112).

9. The air supply fan according to claim 1, characterized in that, The air outlet of the air duct (1) has an installation flange (113) that protrudes outward along the diameter direction of the air duct (1).

10. The air supply fan according to claim 1, characterized in that, The impeller (21) includes a hub (211) and a plurality of blades (212) disposed on the radial outer periphery of the hub (211), wherein the blades (212) are bow-shaped blades.

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