Multi-duct multi-outlet centrifugal fan

Abstract

The application discloses a multi-air-duct and multi-air-outlet centrifugal fan, a fan volute is composed of front and rear vertical plates, multiple shunt plates which are perpendicular to the front and rear vertical plates and a volute shell plate, and the profile lines of the shunt plates and the volute shell plate meet the design principle of the inner wall spiral profile line of a traditional centrifugal fan. Different from the traditional centrifugal fan, multiple shunt plates are arranged in the fan volute cavity, multiple different centrifugal air ducts are formed by the adjacent shunt plates and the shunt plates and the volute shell plate, the shunt plates are provided with volute tongues near the impeller, wind power can smoothly flow into the air duct, and multiple air outlets are arranged in the middle and upper parts of the volute shell plate. Through the design and adjustment of the sizes of the air ducts, especially the outlet opening, the wind power can be controlled to enter the centrifugal air ducts uniformly or non-uniformly, and then the directional wind flow with large air volume and high pressure is output through the air outlets. The application can meet the requirements of different structural sizes of a wind delivery type plant protection spraying machine, and can realize the directional wind delivery requirements of large air volume and high wind pressure uniformly or non-uniformly.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal fan technology and relates to a multi-duct, multi-outlet centrifugal fan. Background Technology

[0002] Currently, the blowers used in the domestic agricultural machinery industry for wind-assisted plant protection spraying are mainly axial flow fans. Their disadvantages are that the air volume is medium and the air pressure is low, which cannot meet the application requirements of large air volume and high air pressure. If traditional centrifugal fans are used, it will lead to problems such as excessively high sprayer height, poor passability, and small air delivery angle. Moreover, it is very difficult to adjust the uniformity and adaptability of air volume and air direction, making it difficult to directly apply to the low-profile wind-assisted plant protection sprayer products required in hilly and mountainous areas. Summary of the Invention

[0003] The purpose of this invention is to provide a new type of centrifugal fan with small size, large air volume, high air pressure, large air delivery angle, multiple air ducts, multiple air outlets, and controllable air output.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a multi-duct, multi-outlet centrifugal fan, the fan comprising a volute and an impeller disposed within the volute; the volute comprising a front vertical plate, a rear vertical plate, at least two spiral diverter plates located between the front and rear vertical plates and perpendicular to the front and rear vertical plates on the outer region of the impeller, a volute outer shell plate between the outer edges of the front and rear vertical plates, and fixed supports connecting the bottoms of the front and rear vertical plates. Adjacent spiral diverter plates and the volute outer shell plate divide the fan cavity into different ducts, and multiple outlets corresponding to each duct are provided on the outer shell plate.

[0005] Furthermore, the spiral diverter plate and the volute outer shell plate gradually open outwards centrifugally along the impeller rotation direction.

[0006] Furthermore, the outer shell plate of the volute, as a component of the fan's shape, can be approximately segmented and simplified into an arc or straight shape for ease of processing and production.

[0007] Furthermore, the air outlets are arranged symmetrically on the left and right sides along the center of the fan impeller.

[0008] Furthermore, the inner diverter plates of the left and right air ducts are positioned on a straight line with the starting volute of the impeller and the center of the impeller, and the angle β between this straight line and the horizontal line ranges from 20° to 40°.

[0009] Furthermore, the outer diverter plates of the left and right air ducts extend along the spiral line and terminate near the first air outlet position of their respective air ducts. The distance between the end point of the left and right diverter plates and the outer edge of the impeller, i.e., the air duct outlet tension, is equal.

[0010] Furthermore, the distance between the end point of the outer diverter plate of the left and right air ducts and the outer edge of the impeller, i.e. the air duct outlet tension, can be set to be unequal as required.

[0011] The beneficial effects of the present invention are as follows: (1) The present invention can meet the needs of small plant protection sprayers. Under the premise of effectively controlling the size of the centrifugal fan, the air volume and air pressure of each air outlet can be adjusted according to actual needs, ensuring that the air volume and air pressure of multiple air outlets are uniform or unevenly controlled, meeting the requirements of wind-driven plant protection sprayers, and has strong applicability. (2) Through the centrifugal air duct, it can have a larger carrying capacity and a longer range, a larger coverage area, and high ventilation efficiency. Attached Figure Description

[0012] Figure 1 This is a front view of the multi-duct, multi-outlet centrifugal fan structure of the present invention; Figure 2 This is a side view of the multi-duct, multi-outlet centrifugal fan structure of the present invention; Figure 3 This is a schematic diagram of the modified structure of the straight-line volute outer shell plate of the present invention. Detailed Implementation

[0013] To make the present invention more apparent and understandable, a detailed description is provided below with reference to specific embodiments and accompanying drawings. It should be understood that these embodiments are for illustrative purposes only.

[0014] This invention provides a multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers, such as... Figure 1 , Figure 2 As shown. This embodiment uses an air-assisted sprayer as an example to further illustrate the invention. When applied to an air-assisted plant protection sprayer, the fan of the present invention includes a volute 1 and an impeller 2 disposed within the volute. The volute 1 includes a front vertical plate 3, a rear vertical plate 4, at least two spiral diverter plates 5 located between the front and rear vertical plates and perpendicular to the front and rear vertical plates on the outer region of the impeller, an arc-shaped or straight volute outer shell plate 6 between the outer edges of the front and rear vertical plates, and fixed support feet 7 connected to the bottom of the front and rear vertical plates. The spiral diverter plates 5 gradually open along the impeller rotation direction, that is, the distance between the diverter plates 5 and the outer edge of the impeller 2 increases from small to large. Adjacent diverter plates 5, diverter plates 5 and volute outer shell plate 6 divide the fan cavity into multiple different air ducts 8.

[0015] Preferably, multiple air outlets 9 are set at corresponding positions on the outer shell plate 6 of the volute, according to the number and arrangement of the plant protection sprayer nozzles.

[0016] Preferably, the air outlet 9 can be symmetrically arranged along the outer shell panel 6, and can be evenly or unevenly distributed as needed.

[0017] Preferably, to ensure symmetrical and uniform airflow from the left and right sides of the plant protection sprayer, the starting volute position of the left and right air duct splitter plate near the impeller is aligned with the center of the impeller to ensure equal airflow and pressure in both air ducts. The angle β between this straight line and the horizontal line or the bottom edge of the fixed support 7 is 20-40°.

[0018] Preferably, in order to ensure the symmetrical and uniform air output of the plant protection sprayer, the split plates of the left and right air ducts are extended along the spiral line and terminate at the position close to the first air outlet of their respective air ducts. The distance between the end point of the split plate and the outer edge of the impeller, i.e., the air duct outlet tension L1 and L2, are equal.

[0019] Preferably, in order to ensure the adaptability of the plant protection sprayer to the left and right air outlets, the distances between the end point of the split plate of the left and right air ducts and the outer edge of the impeller, i.e., the air duct outlet tensions L1 and L2, can be set to be unequal as needed.

[0020] This invention discloses a multi-duct, multi-outlet centrifugal fan. It employs a multi-duct fan casing, combined with impeller rotation, to form multiple centrifugal ducts under centrifugal force, ultimately flowing to the outlet. This achieves controllable uniform or non-uniform airflow from the sprayer, fulfilling the requirements for air delivery distance and height while meeting the sprayer's throughput requirements. Those skilled in the art can make various modifications and variations to this invention. If such modifications and variations do not deviate from the principles and techniques employed in this invention, then this invention is also intended to include these modifications and variations.

Claims

1. A multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers, the fan comprising a volute (1) and an impeller (2) disposed within the volute, the volute (1) comprising a front vertical plate (3), a rear vertical plate (4), an arc-shaped or straight volute outer shell plate (6) connecting the outer edges of the front and rear vertical plates, and fixed support feet (7) connected to the bottom of the front and rear vertical plates, characterized in that, The volute also includes multiple spiral-shaped diverter plates (5) located on the outer side of the impeller and disposed between the front and rear vertical plates. The diverter plates are perpendicular to the front and rear vertical plates, and the shape of the diverter plates is a spiral shape that gradually opens centrifugally along the rotation direction of the impeller. The adjacent diverter plates (5), the outermost diverter plate, and the outer shell plate (6) of the volute together divide the fan cavity into multiple independent air ducts (8). According to the number and arrangement of the plant protection sprayer nozzles, the outer shell plate (6) of the volute is divided into multiple independent air ducts (8). Multiple air outlets (9) are provided on the shell plate (6) at corresponding positions and are connected to the multiple air ducts (8) one by one; the starting volute position of the left and right air duct splitter plate near the impeller is set on a straight line with the center of the impeller, and the angle β between the straight line and the bottom edge of the fixed support (7) is in the range of 20°~40°; the splitter plate of the left and right air ducts extends along the spiral line and terminates at the position of the first air outlet near the air duct of its respective air duct, and the distance between the end point of the splitter plate and the outer edge of the impeller, i.e. the air duct outlet tension L1 and L2, is equal.

2. The multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers as described in claim 1, characterized in that, The multiple spiral diverter plates (5) gradually open along the rotation direction of the impeller (2), that is, the distance between the diverter plates (5) and the outer edge of the impeller (2) increases from small to large.

3. A multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers as described in claim 1, characterized in that, The outer shell plate (6) of the volute is a component of the volute shape of the fan. To facilitate processing and production, it is simplified into arc or straight sections.

4. A multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers as described in claim 1, characterized in that, The positions of the air duct (8) and the air outlet (9) are arranged symmetrically around the center of the fan impeller (2).

5. A multi-duct, multi-outlet centrifugal fan suitable for wind-assisted plant protection sprayers as described in claim 1, characterized in that, By adjusting the distance between the end point of the left and right air duct outer diverter plate (5) and the outer edge of the impeller, i.e. the air duct outlet tension L1 and L2, the airflow and air pressure of different air ducts (8) and thus different air outlets (9) can be controlled.

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