A low-noise axial flow centrifugal fan

Abstract

This utility model relates to the technical field of ventilation fans, and in particular to a low-noise axial flow centrifugal fan, which can not only guide and disperse gas to avoid the generation of eddies in the device or the impact on the shell, but also has a streamlined design inside the shell to reduce the noise during operation; it includes a support mechanism; it also includes a drive mechanism, an air intake mechanism and a flow guiding mechanism. The drive mechanism is mounted on the support mechanism and drives the air intake mechanism to rotate. The air intake mechanism is mounted on the drive mechanism and draws in air. The flow guiding mechanism is mounted on the drive mechanism and guides the airflow.

Description

Technical Field

[0001] This utility model relates to the technical field of ventilation fans, and in particular to a low-noise axial flow centrifugal ventilation fan. Background Technology

[0002] Axial flow fans and centrifugal fans are the two most common types of ventilation equipment in industrial and civil applications. Axial flow fans are characterized by large flow rates and low pressure, while centrifugal fans can provide higher pressure but have relatively smaller flow rates.

[0003] Existing axial centrifugal fans, such as the axial centrifugal fan disclosed in utility model patent application number 202121221231.7, mainly include a housing, which includes an inlet duct and an outlet duct. A drive motor and a centrifugal impeller are installed inside the housing. The inlet duct and the outlet duct are connected as one unit by a conical tube. A fixed plate is provided at the upper end of the conical tube, and the drive motor is fixed on the fixed plate. In use, the drive motor drives the centrifugal impeller to rotate through the rotating shaft. During the rotation of the centrifugal impeller, the airflow is drawn from the inlet duct into the space of the centrifugal impeller. The airflow entering the space of the centrifugal impeller is radially pushed by the blades of the centrifugal impeller into the air inlet channel composed of several adjacent guide vanes inside the conical tube under the action of centrifugal force.

[0004] However, existing axial centrifugal fans are prone to generating eddies and impacts, which affect the smoothness of the axial flow of air and are also noisy, having a significant impact on the surrounding environment. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a low-noise axial centrifugal fan that not only guides and disperses gas to avoid generating eddies or impacting the casing, but also features a streamlined design inside the casing to reduce noise during operation.

[0006] This utility model discloses a low-noise axial centrifugal fan, including a support mechanism; it also includes a drive mechanism, an air intake mechanism, and a flow guiding mechanism. The drive mechanism is mounted on the support mechanism and drives the air intake mechanism to rotate. The air intake mechanism is mounted on the drive mechanism and draws in air. The flow guiding mechanism is mounted on the drive mechanism and guides the airflow. After the operator installs the support mechanism in the working position, the drive mechanism is energized to drive the air intake mechanism to rotate. The rotation of the air intake mechanism draws in air, causing the airflow to flow backward through the support mechanism. By setting the flow guiding mechanism, the airflow is prevented from generating eddies and impacts, and the air is smoothly transported axially backward.

[0007] Preferably, the support mechanism includes a base, a housing, a conical shell, an air collector, and a connecting flange. The bottom end of the base is connected to the working surface, the bottom end of the housing is connected to the top end of the base, the conical shell is connected to the front end of the housing, the air collector is connected to the front end of the housing, and the connecting flange is installed at the rear end of the housing. The operator uses bolts to fix the base to the working surface and uses bolts to connect the connecting flange to the subsequent ventilation duct. Air enters through the air collector, and the air intake mechanism works with the conical shell to draw in air, causing the air to flow rapidly backward.

[0008] Preferably, the connection between the air collector, the cone shell, and the housing is chamfered and transitioned through a smooth arc surface; the smooth arc surface is used to guide the intake airflow to flow smoothly backward, reducing noise generation.

[0009] Preferably, the drive mechanism includes a support rod, a variable frequency motor, and a high-voltage penetrating component. The support rod is installed inside the housing, the variable frequency motor is installed on the support rod, and the high-voltage penetrating component is installed on the housing and connected to the variable frequency motor via a wire. The high-voltage penetrating component is connected to a power source and supplies power to the variable frequency motor via a wire, thereby driving the intake mechanism to rotate.

[0010] Preferably, the air intake mechanism includes a hanger, a coupling, an impeller, multiple sets of blades, and a streamlined body. The hanger is installed inside the housing, the coupling is installed on the hanger, the impeller is rotatably installed on the coupling, and the power input end of the impeller is connected to the power output end of the variable frequency motor. Multiple sets of blades are installed on the impeller, and the streamlined body is installed on the impeller. The variable frequency motor drives the impeller to rotate, and the impeller drives the multiple sets of blades to rotate and draw in air. The airflow flows into the housing through the conical shell, and the streamlined body facilitates the dispersion of the incoming airflow.

[0011] Preferably, the blade also employs a forward-curved airfoil with a large twist angle in the root to middle region and a backward-curved centrifugal airfoil in the middle to top region. The forward-curved airfoil with a large twist angle in the root to middle region efficiently draws in and accelerates air in an axial flow fan-like manner at the inlet section. The backward-curved centrifugal airfoil in the middle to top region of the blade smoothly transitions to the front axial flow section, efficiently converting the kinetic energy of the air into pressure energy and ejecting it centrifugally.

[0012] Preferably, the flow guiding mechanism includes a rectifier and multiple sets of guide plates. The rectifier is installed on the variable frequency motor, and the multiple sets of guide plates are all installed on the inner wall of the housing. By setting the rectifier and multiple sets of guide plates, it is convenient to guide the airflow in the housing and avoid the airflow from generating eddies or impacting the housing.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: After the staff installs the support mechanism in the working position, the drive mechanism is powered on to drive the suction mechanism to rotate. The rotation of the suction mechanism draws in air, causing the airflow to flow backward through the support mechanism. By setting the flow guide mechanism, the airflow is prevented from generating eddies and impacts, and it is smoothly transported axially backward. Attached Figure Description

[0014] Figure 1 This is a front view cross-sectional structural diagram of the present invention; Figure 2 This is an isometric structural diagram of the support mechanism of this utility model; Figure 3 This is a cross-sectional isometric structural diagram of the drive mechanism and intake mechanism of this utility model; Figure 4 This is a cross-sectional isometric structural diagram of the air intake mechanism of this utility model; Figure 5 This is an isometric structural diagram of the flow guiding mechanism of this utility model.

[0015] The following labels are used in the attached diagram: 01, Support mechanism; 11, Base; 12, Shell; 13, Conical shell; 14, Air collector; 15, Connecting flange; 02, Drive mechanism; 21, Support rod; 22, Variable frequency motor; 23, High-pressure penetrating component; 03, Suction mechanism; 31, Hanger; 32, Coupling; 33, Impeller; 34, Blade; 35, Streamline; 04, Guide mechanism; 41, Rectifier; 42, Guide plate. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0017] Example 1 This utility model discloses a low-noise axial flow centrifugal fan, including a support mechanism 01; it also includes a drive mechanism 02, an air intake mechanism 03, and a flow guiding mechanism 04. The drive mechanism 02 is mounted on the support mechanism 01 and drives the air intake mechanism 03 to rotate. The air intake mechanism 03 is mounted on the drive mechanism 02 and draws in air. The flow guiding mechanism 04 is mounted on the drive mechanism 02 and guides the airflow. The support mechanism 01 includes a base 11, a housing 12, a conical shell 13, an air collector 14, and a connecting flange 15. The bottom end of the base 11 is connected to the working surface, and the bottom end of the housing 12 is connected to the top end of the base 11. The conical shell 13 is connected to the front end of the housing 12, the air collector 14 is connected to the front end of the housing 12, and the connecting flange 15 is installed at the rear end of the housing 12; the connection points of the air collector 14, the conical shell 13, and the housing 12 are all chamfered and transitioned through smooth arc surfaces; the drive mechanism 02 includes a support rod 21, a variable frequency motor 22, and a high-pressure penetrating component 23. The support rod 21 is installed inside the housing 12, the variable frequency motor 22 is installed on the support rod 21, and the high-pressure penetrating component 23 is installed on the housing 12 and connected to the variable frequency motor 22 via a wire; the suction mechanism 03 includes... The system includes a hanger 31, a coupling 32, an impeller 33, multiple sets of blades 34, and a streamlined body 35. The hanger 31 is installed inside the housing 12, the coupling 32 is installed on the hanger 31, the impeller 33 is rotatably mounted on the coupling 32, and the power input end of the impeller 33 is connected to the power output end of the variable frequency motor 22. Multiple sets of blades 34 are all installed on the impeller 33, and the streamlined body 35 is also installed on the impeller 33. Furthermore, the root to middle region of the blades 34 adopts a forward-curved airfoil with a large twist angle, while the middle to top region of the blades 34 adopts a backward-curved centrifugal airfoil. During operation... First, the workers use bolts to fix the base 11 to the working surface, and use bolts to connect the connecting flange 15 to the subsequent ventilation duct. Air enters through the air collector 14, and the high-pressure penetrating component 23 is connected to the power supply. The high-pressure penetrating component 23 supplies power to the variable frequency motor 22 through the wire. The variable frequency motor 22 drives the impeller 33 to rotate, and the impeller 33 drives multiple sets of blades 34 to rotate and draw in air. The airflow flows into the housing 12 through the conical shell 13. The streamlined body 35 is set to facilitate the dispersion of the incoming airflow. The smooth arc surface is used to guide the incoming airflow to flow smoothly backward and reduce the generation of noise.

[0018] Example 2 like Figures 1 to 5As shown, this utility model discloses a low-noise axial centrifugal fan, based on embodiment 1. The flow guiding mechanism 04 includes a rectifier 41 and multiple sets of guide plates 42. The rectifier 41 is mounted on the variable frequency motor 22, and the multiple sets of guide plates 42 are all mounted on the inner wall of the housing 12. During operation, the operator first uses bolts to fix the base 11 to the working surface, and then uses bolts to connect the connecting flange 15 to the subsequent ventilation duct. Air enters through the air collector 14, and the high-pressure penetrating component 23 is connected to the power supply. 23 supplies power to the variable frequency motor 22 through wires. The variable frequency motor 22 drives the impeller 33 to rotate. The impeller 33 drives multiple sets of blades 34 to rotate and draw in air. The airflow flows into the housing 12 through the conical shell 13. The streamlined body 35 is set to facilitate the dispersion of the incoming airflow. The smooth arc surface is used to guide the incoming airflow to flow smoothly backward and reduce the generation of noise. The rectifier 41 and multiple sets of guide plates 42 are set to facilitate the guidance of the airflow in the housing 12 and avoid the airflow from generating eddies or impacting the housing 12.

[0019] The variable frequency motor 22 and high voltage penetrating component 23 of this utility model are purchased from the market. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0020] The above description is only a preferred embodiment of the present 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 the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A low-noise axial-flow centrifugal fan, comprising a support mechanism (01); characterized in that, It also includes a drive mechanism (02), an air intake mechanism (03) and a flow guide mechanism (04). The drive mechanism (02) is mounted on the support mechanism (01) and drives the air intake mechanism (03) to rotate. The air intake mechanism (03) is mounted on the drive mechanism (02) and intakes air. The flow guide mechanism (04) is mounted on the drive mechanism (02) and guides the airflow.

2. The low-noise axial centrifugal fan as described in claim 1, characterized in that, The support mechanism (01) includes a base (11), a housing (12), a conical shell (13), an air collector (14), and a connecting flange (15). The bottom end of the base (11) is connected to the working surface, the bottom end of the housing (12) is connected to the top end of the base (11), the conical shell (13) is connected to the front end of the housing (12), the air collector (14) is connected to the front end of the housing (12), and the connecting flange (15) is installed at the rear end of the housing (12).

3. A low-noise axial-flow centrifugal fan as described in claim 2, characterized in that, It also includes chamfering at the connection points of the air collector (14), the cone shell (13), and the shell (12), with smooth arc surfaces for transition.

4. A low-noise axial-flow centrifugal fan as described in claim 2, characterized in that, The drive mechanism (02) includes a support rod (21), a variable frequency motor (22) and a high voltage penetrating component (23). The support rod (21) is installed inside the housing (12), the variable frequency motor (22) is installed on the support rod (21), and the high voltage penetrating component (23) is installed on the housing (12) and connected to the variable frequency motor (22) by a wire.

5. A low-noise axial centrifugal fan as described in claim 4, characterized in that, The intake mechanism (03) includes a hanger (31), a coupling (32), an impeller (33), multiple sets of blades (34), and a streamline (35). The hanger (31) is installed inside the housing (12), the coupling (32) is installed on the hanger (31), the impeller (33) is rotatably installed on the coupling (32), and the power input end of the impeller (33) is connected to the power output end of the variable frequency motor (22). Multiple sets of blades (34) are all installed on the impeller (33), and the streamline (35) is installed on the impeller (33).

6. A low-noise axial-flow centrifugal fan as described in claim 5, characterized in that, It also includes the root to middle region of the blade (34) with a forward-curved airfoil with a large twist angle, and the middle to top region of the blade (34) with a backward-curved centrifugal airfoil.

7. A low-noise axial-flow centrifugal fan as described in claim 4, characterized in that, The flow guiding mechanism (04) includes a rectifier (41) and multiple sets of flow guide plates (42). The rectifier (41) is installed on the variable frequency motor (22), and the multiple sets of flow guide plates (42) are all installed on the inner wall of the housing (12).

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