Efficient centrifugal fan

Abstract

The utility model provides an efficient centrifugal fan, relates to the technical field of ventilation equipment, and solves the technical problem that environmental dust is easily adhered to blades of an existing centrifugal fan. The fan comprises a fan box body and an impeller for discharging gas, the box body is provided with a flow collecting cover for collecting the gas and accelerating the gas, and the impeller is provided with a front end face for supporting rotation, a rear end opening for conveying the gas to the flow collecting cover and arc-shaped fan blades for conveying and compressing the gas. The area of the front end face is larger than that of the end face of the rear port. Air flow entering from the air inlet is compressed and collected, air flow loss is reduced, the air flow speed is increased, and dust in air is prevented from being attached to or falling into the fan blades or the fan due to low flow speed and affecting operation and efficiency of the fan for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, in particular to a high-efficiency centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draft of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selection of grains; inflation and propulsion of wind tunnel wind sources and hovercraft, etc. A centrifugal fan is an air mechanical device, mainly composed of an air inlet, a centrifugal impeller, an outlet, a drive device, etc. Its working principle is to draw outside air into the impeller to accelerate the movement, and then eject it through the outlet, thereby forming a strong wind effect.

[0003] Therefore, centrifugal fans work in more complex environments, with high temperature and pressure, high dust content, flammable and explosive working conditions. Existing products have a lot of dust adhesion on the impeller during use in the steel, building materials, electricity, chemical and other industries. Dust adhesion can easily destroy the dynamic balance of the centrifugal fan impeller, causing the fan vibration to exceed the standard and causing the production line to stop, causing great losses to users.

[0004] When a fluid containing a large amount of dust passes through the centrifugal fan impeller, over a long period of time, the overly large dust particles will cause wear on the internal flow surface of the fan. Severe wear can pierce or deform the fan parts, thus affecting the safety of the fan operation. Tiny dust easily adheres to the blades, causing dust accumulation, destroying the dynamic balance of the impeller, and affecting the user's safe production.

[0005] At present, when designing and selecting fans for working conditions with high dust concentration, the designed fan working conditions can meet user needs, but the inlet and outlet installation angles of the blades and the type of the blades are prone to cause dust adhesion, and the blade installation angle and type have a great influence on the performance of the fan. Forced modifications are likely to cause insufficient fan performance.

[0006] Therefore, the patent with publication number CN116361942A proposes a dust-proof and efficient centrifugal fan impeller design optimization method. The impeller manufactured by the method can solve the problem of dust adhesion on the impeller, extend the service life of the impeller, and ensure high efficiency and energy saving. However, in actual production and sales, the calculation and selection of the impeller is based on the actual use occasion, which is costly and has low versatility in actual production. Utility Model Content

[0007] The utility model aims to provide a high-efficiency centrifugal fan to solve the technical problem that the blades of the existing centrifugal fans are easily adhered to environmental dust.

[0008] The embodiments of the present invention are implemented by the following technical solutions:

[0009] A high-efficiency centrifugal fan comprises a casing and an impeller for exhausting gas, wherein the casing is provided with a collecting hood for collecting and accelerating gas, and the impeller is provided with a front end face for supporting rotation, a rear port for conveying gas to the collecting hood, and arc-shaped blades for conveying and compressing gas, wherein the area of ​​the front end face is larger than the area of ​​the rear port end face.

[0010] Preferably, the fan blades include a plurality of groups of long fan blades connected to the rear port of the front end face and short fan blades arranged between adjacent long fan blades, and the short fan blades are connected to the front end face.

[0011] Preferably, it further comprises a driving device for driving the impeller to rotate, and the driving device is provided with a rotating shaft for transmission connection with the impeller.

[0012] Preferably, the impeller also includes a rotating seat for transmission connection with the rotating shaft.

[0013] Preferably, the box body is also provided with an air inlet for taking in air and an air outlet for exhausting air.

[0014] Preferably, the air outlet is provided with a flange for connecting to a pipeline.

[0015] Preferably, the box body further comprises fixing feet for fixing the box body and a frame for supporting the box body.

[0016] By adopting this technical solution, the airflow entering the air inlet can be compressed and collected through the structure of the collecting cover and the impeller, and the airflow loss can be reduced, the airflow velocity can be accelerated, and the dust in the air can be prevented from adhering to or settling on the fan blades or the fan due to the slow flow velocity, which will affect the operation and efficiency of the fan for a long time.

[0017] The long blades and short blades of the present application compress and concentrate the airflow into the collecting cover, while the short blades divert the airflow at the front end and concentrate the airflow at the rear end, and the cross-sectional area of ​​the rear impeller is reduced, thereby increasing the flow rate of the airflow.

[0018] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0019] The utility model compresses and gathers the airflow entering from the air inlet, reduces airflow loss, speeds up the airflow velocity, and prevents dust in the air from adhering to or settling on the fan blades or the fan due to the slow flow velocity, thereby affecting the operation and efficiency of the fan for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the top view of the high-efficiency centrifugal fan provided in Example 1 of the utility model;

[0022] Figure 2 A schematic diagram of the three-dimensional structure of a high-efficiency centrifugal fan provided in Example 1 of the utility model;

[0023] Figure 3 A schematic diagram of the impeller structure of a high-efficiency centrifugal fan provided in Example 1 of the utility model;

[0024] Icons: 1. Box body; 11. Fixed foot; 12. Frame; 13. Collector cover; 2. Air inlet; 3. Air outlet; 31. Flange; 4. Impeller; 41. Short blades; 42. Long blades; 43. Rear port; 44. Front face; 45. Rotating seat; 5. Driving device; 51. Rotating shaft. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] A high-efficiency centrifugal fan comprises a casing 1 and an impeller 4 for exhausting gas, wherein the casing 1 is provided with a collecting hood 13 for collecting and accelerating gas, and the impeller 4 is provided with a front end face 44 for supporting rotation, a rear port 43 for conveying gas to the collecting hood 13, and arc-shaped blades for conveying and compressing gas, wherein the area of ​​the front end face 44 is larger than the end face area of ​​the rear port 43.

[0032] In this embodiment, the fan blades include a plurality of groups of long fan blades 42 connected to the rear port 43 of the front end surface 44 and short fan blades 41 provided between adjacent long fan blades 42 , and the short fan blades 41 are connected to the front end surface 44 .

[0033] In this embodiment, a driving device 5 for driving the impeller 4 to rotate is further included. The driving device 5 is provided with a rotating shaft 51 for transmission connection with the impeller 4 .

[0034] In this embodiment, the impeller 4 further includes a rotating seat 45 for transmission connection with the rotating shaft 51 .

[0035] In this embodiment, the box body 1 is further provided with an air inlet 2 for air intake and an air outlet 3 for air exhaust.

[0036] In this embodiment, the air outlet 3 is provided with a flange 31 for connecting to a pipeline.

[0037] In this embodiment, the box body 1 further includes fixing legs 11 for fixing the box body 1 and a frame 12 for supporting the box body 1 .

[0038] Working principle and usage:

[0039] When in use, the airflow entering the air inlet 2 can be compressed and collected through the structure of the collecting cover 13 and the impeller 4, and the airflow loss can be reduced, the airflow velocity can be accelerated, and dust in the air can be prevented from adhering to or settling on the fan blades or the fan due to the slow flow velocity, which will affect the operation and efficiency of the fan for a long time;

[0040] The long blades 42 and the short blades 41 of the present application compress and concentrate the airflow to the collecting cover 13, while the short blades 41 divert the airflow at the front end and concentrate the airflow at the rear end, and increase the flow rate of the airflow as the cross-sectional area of ​​the rear impeller 4 decreases.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency centrifugal fan, comprising a housing (1) and an impeller (4) for exhausting gas, characterized in that: The housing (1) is provided with a collecting hood (13) for collecting and accelerating gas, the impeller (4) is provided with a front end face (44) for supporting rotation, a rear port (43) for conveying gas to the collecting hood (13), and arc-shaped blades for conveying and compressing gas, and the area of ​​the front end face (44) is larger than the end face area of ​​the rear port (43).

2. A high-efficiency centrifugal fan according to claim 1, characterized in that: The fan blades include a plurality of groups of long fan blades (42) connected to the rear port (43) of the front end surface (44) and short fan blades (41) arranged between adjacent long fan blades (42), wherein the short fan blades (41) are connected to the front end surface (44).

3. A high-efficiency centrifugal fan according to claim 1 or 2, characterized in that: It also comprises a driving device (5) for driving the impeller (4) to rotate, wherein the driving device (5) is provided with a rotating shaft (51) for transmission connection with the impeller (4).

4. A high-efficiency centrifugal fan according to claim 3, characterized in that: The impeller (4) further comprises a rotating seat (45) for transmission connection with the rotating shaft (51).

5. A high-efficiency centrifugal fan according to any one of claims 1, 2 and 4, characterized in that: The box body (1) is also provided with an air inlet (2) for taking in air and an air outlet (3) for exhausting air.

6. A high-efficiency centrifugal fan according to claim 5, characterized in that: The air outlet (3) is provided with a flange (31) for connecting to a pipeline.

7. A high-efficiency centrifugal fan according to any one of claims 1, 2 and 4, characterized in that: The box body (1) also includes fixing feet (11) for fixing the box body (1) and a frame (12) for supporting the box body (1).

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