Axial flow fan guide vane device and axial flow fan

Abstract

This utility model belongs to the field of axial flow fan technology, specifically disclosing an axial flow fan guide vane device and an axial flow fan. The guide vane device includes: an inner cylinder with multiple evenly distributed long guide vanes; long guide vanes, one end of which is connected to the inner cylinder, and the other end passes through a reinforcing ring and connects to the outer shell; a reinforcing ring with multiple evenly distributed short guide vanes; and short guide vanes, each positioned in the middle between two adjacent long guide vanes. This utility model not only perfectly matches the impeller's blade shape characteristics, resulting in good airflow performance and improved overall fan performance, but also significantly enhances the overall strength of the guide vanes through this combination of long and short guide vane design, while ensuring the overall airflow effect after exiting the impeller.

Description

Technical Field

[0001] This utility model belongs to the field of axial flow fan technology, and in particular relates to an axial flow fan guide vane device and an axial flow fan. Background Technology

[0002] Axial flow fans are widely used mechanical equipment in industrial and agricultural production and daily life, covering multiple engineering fields such as power, electricity, chemical, metallurgy, and machinery. Examples include factory workshop ventilation, warehouse ventilation and dehumidification, and tunnel ventilation in the industrial sector; building ventilation systems and building fire smoke extraction in the construction sector; and greenhouse ventilation and livestock ventilation in the agricultural sector. Many industries primarily focus on air volume, energy consumption, and cost when evaluating fan performance. To meet cost requirements and achieve high cost-effectiveness to capture market share, fan manufacturers mass-produce ordinary fans without backflow guides. However, as industries demand higher performance from industrial products, especially energy conservation, they require fans that meet air volume requirements, offer high cost-effectiveness, and improve fan efficiency. Ordinary fans without backflow guides often cannot meet these requirements.

[0003] To meet market demands, fan manufacturers have made various attempts to improve ordinary fans. Some continuously improve the performance of the motor itself to enhance the overall performance of the fan; others continuously optimize the flow performance of the impeller; while still others optimize fan performance by adding a rear air guide device. Although the methods differ, in the long run, fans with air guide devices are a future trend, and these fans often exhibit superior performance compared to their ordinary counterparts without them.

[0004] However, conventional guide vanes also have certain problems. The guide vanes in conventional guide vanes are designed to match the impeller blade shape, inlet and outlet airflow angles, etc., and are made of the same type of blade array with specific blade density. However, the design of such common guide vanes mainly considers performance improvement from the perspective of the whole machine, without considering optimization from the details. They cannot match the blade shape characteristics of the impeller well, cannot guarantee the rectification effect of the airflow after the impeller, and the overall strength of the guide vanes is low. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides an axial flow fan guide vane device and an axial flow fan, which can solve the above problems.

[0006] To achieve the above objectives, one aspect of this utility model provides an axial flow fan guide vane device, comprising:

[0007] The inner cylinder is provided with a plurality of evenly distributed long guide vanes;

[0008] A long guide vane, one end of which is connected to the inner cylinder, and the other end of which passes through the reinforcing ring and connects to the outer shell;

[0009] A reinforcing ring, wherein multiple short guide vanes are evenly distributed on the reinforcing ring;

[0010] Short guide vanes, each of which is located in the middle between two adjacent long guide vanes.

[0011] Compared with existing technologies, this application offers the following advantages: The guide vane device designed in this application includes a long guide vane, a short guide vane, and a reinforcing ring. The long guide vane passes through the reinforcing ring, and the short guide vane is mounted on the reinforcing ring. Each short guide vane is positioned in the middle between two adjacent long guide vanes. This design not only perfectly matches the impeller's blade shape characteristics, resulting in excellent airflow performance and improved overall fan performance, but also significantly enhances the overall strength of the guide vane by combining long and short guide vanes, while ensuring the overall airflow effect after exiting the impeller.

[0012] Furthermore, the guide vane device is integrally injection molded in multiple sections.

[0013] Furthermore, the guide vane device can be divided into n segments for splicing, where 1≤n≤10.

[0014] Furthermore, it also includes a flange connected to the housing for connecting other devices externally via the flange.

[0015] Furthermore, the thickness of the outer shell is H, and 20mm≤H≤200mm.

[0016] Furthermore, the inner cylinder is annular.

[0017] Furthermore, the length of the long guide vane is twice that of the short guide vane.

[0018] Another aspect of this utility model provides an axial flow fan, including a fan casing, a motor, an impeller hub, and an impeller. The impeller is installed inside the fan casing via the impeller hub and the motor. The fan also includes the aforementioned guide vane device, which is installed on the fan casing behind the impeller according to the airflow direction and is not connected to the impeller.

[0019] Furthermore, the inner cylinder size is 0 to 1.5 times the size of the impeller hub.

[0020] Furthermore, the number of long guide vanes is a, where a is a natural number, and a ≥ the number of blades of the impeller + 1. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an axial flow fan guide vane device according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of a cylindrical concave-convex groove structure;

[0024] Figure 3 This is a schematic diagram of a portion of the structure of the guide vane device installed inside the air duct.

[0025] The attached figures are labeled as follows:

[0026] 1. Outer shell; 2. Short guide vane; 3. Long guide vane; 4. Reinforcing ring; 5. Inner cylinder; 6. Flange; 7. Air duct; 8. Convex splicing surface; 9. Concave splicing surface. Detailed Implementation

[0027] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1-3 As shown, this utility model provides an axial flow fan guide vane device, comprising:

[0029] Inner cylinder 5, with multiple evenly distributed long guide vanes 3 on the inner cylinder 5;

[0030] Long guide vane 3, one end of long guide vane 3 is connected to inner cylinder 5, and the other end passes through reinforcing ring 4 and is connected to outer shell 1;

[0031] The reinforcing ring 4 has multiple evenly distributed short guide vanes 2.

[0032] Short guide vanes 2, each short guide vane 2 is located in the middle position between two adjacent long guide vanes 3.

[0033] Compared with existing technologies, this application has the following advantages: The guide vane device designed in this application includes a long guide vane 3, a short guide vane 2, and a reinforcing ring 4. The long guide vane 3 passes through the reinforcing ring 4, and the short guide vane 2 is provided on the reinforcing ring 4. Each short guide vane 2 is located in the middle position between two adjacent long guide vanes 3. This design not only matches the blade shape characteristics of the impeller well, resulting in good airflow performance and improving the overall performance of the fan, but also greatly improves the overall strength of the guide vane by combining long and short guide vanes, while ensuring the overall airflow effect after exiting the impeller.

[0034] Following the above embodiments, more specifically, the guide vane device is integrally injection molded in multiple sections.

[0035] Following the above embodiments, more specifically, as Figure 3 As shown, the guide vane device can be divided into n segments for splicing, where 1≤n≤10. The splicing method adopts a cylindrical concave-convex groove structure, and the spliced ​​parts are fixed with bolts or screws.

[0036] In one embodiment, n is 4 segments, meaning the guide vane device is divided into 4 identical segments. This allows for the production of 4 identical products using only a small mold. These 4 products are then joined together using a cylindrical groove structure and secured with bolts or screws, thus completing the guide vane device. This design significantly reduces mold-making costs, thereby lowering the overall product manufacturing cost.

[0037] Following the above embodiments, more specifically, it also includes a flange 6 connected to the housing 1 for connecting other devices externally via the flange 6. In one embodiment, such as Figure 2 As shown, other equipment can be the air duct 7. That is, the outer shell 1 can be directly inserted into the air duct 7 or connected to the air duct 7 through the flange 6.

[0038] Following the above embodiment, more specifically, the thickness of the outer shell 1 is H, and 20mm≤H≤200mm, in order to ensure a compact structure and avoid interference with the installed fans and equipment.

[0039] Following the above embodiment, more specifically, the inner cylinder 5 is annular, with the same shape as the impeller hub.

[0040] Following the above embodiment, more specifically, the length of the long guide vane 3 is twice that of the short guide vane 2 to ensure the best rectification effect.

[0041] Another aspect of this utility model provides an axial flow fan, including a fan casing 7, a motor, an impeller hub, and an impeller. The impeller is installed inside the fan casing 7 via the impeller hub and the motor. It also includes the aforementioned guide vane device, which is installed on the fan casing behind the impeller according to the airflow direction and is not connected to the impeller. It is understood that the guide vane device and the impeller are two separate structures. Compared to the conventional guide vane device in the prior art, which requires lengthening the fan casing and makes the fan an integral structure, the manufacturing cost of the fan is significantly reduced. Furthermore, the addition of the guide vane device can be considered based on the on-site performance requirements.

[0042] Following the above embodiments, more preferably, the size of the inner cylinder 5 is 0 to 1.5 times the size of the impeller hub. Specifically, the size of the annular inner cylinder 5 is the same as or slightly larger than the size of the impeller hub, so as to better match the impeller's blade shape characteristics, resulting in better airflow performance and improved overall fan performance.

[0043] Following the above embodiment, a more preferred embodiment is that the number of long guide vanes is a, where a is a natural number and a ≥ the number of blades of the impeller + 1, so as to ensure the air guiding effect.

[0044] A comparative test was conducted on fans with and without guide vanes. The fans with guide vanes showed significant improvements in airflow, power, and static pressure efficiency under different static pressure conditions; the higher the static pressure, the greater the difference in energy efficiency ratio. The static pressure typically used for this equipment is 200-250 kcal / kg. Pa Taking this static pressure as an example, under this static pressure condition, the energy efficiency ratio of the fan with guide vane device increased by 8%-22%, indicating that the guide vane device designed in this application greatly improves both the air guiding performance and the overall performance of the fan. The test data are as follows:

[0045]

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A guide vane arrangement for an axial flow fan, characterised in that, include: The inner cylinder is provided with a plurality of evenly distributed long guide vanes; A long guide vane, one end of which is connected to the inner cylinder, and the other end of which passes through the reinforcing ring and connects to the outer shell; A reinforcing ring, wherein multiple short guide vanes are evenly distributed on the reinforcing ring; Short guide vanes, each of which is located in the middle between two adjacent long guide vanes.

2. A guide vane device for an axial fan according to claim 1, characterized in that The guide vane device is integrally injection molded in multiple sections.

3. A guide vane device for an axial fan according to claim 2, characterized in that The guide vane device can be divided into n segments for splicing, where 1≤n≤10.

4. The axial flow fan guide vane device according to claim 3, characterized in that, It also includes a flange connected to the housing for connecting other devices via the flange.

5. A guide vane arrangement for an axial fan according to claim 4, characterised in that The thickness of the outer shell is H, and 20mm≤H≤200mm.

6. A guide vane arrangement for an axial fan according to claim 5, characterised in that The inner cylinder is annular.

7. A guide vane device for an axial fan according to claim 6, characterized in that The length of the long guide vane is twice that of the short guide vane.

8. An axial flow fan comprising a duct, a motor, an impeller hub and an impeller, said impeller being mounted inside said duct by means of the impeller hub, the motor, characterized in that, It also includes the guide vane device as described in any one of claims 1-7, wherein the guide vane device is installed on the air duct behind the impeller according to the airflow direction and is not connected to the impeller.

9. An axial fan as claimed in claim 8, characterised in that The inner cylinder size is 0 to 1.5 times the size of the impeller hub.

10. An axial fan as claimed in claim 9, wherein The number of long guide vanes is a, where a is a natural number, and a ≥ the number of blades of the impeller + 1.

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