Static pressure lifting type axial flow fan

Abstract

The utility model relates to the technical field of axial flow fans, and provides a static pressure lifting type axial flow fan. Comprising a combined air duct, a low-resistance plate type motor support is installed at the conical side flange end of the combined air duct, a motor is installed on a fixing ring of the low-resistance plate type motor support, an impeller is installed and locked at the position of an output shaft of the motor through a coupler in a matched mode, and a protective net cover is installed at the conical side flange end of the combined air duct. And a motor junction box is mounted on the outer side of the cylinder wall of the conical part of the combined air cylinder. According to the utility model, the motor is started to drive the impeller to rotate, as airflow passes through the conical outlet air duct, the outlet air speed is greatly reduced, the outlet dynamic pressure is reduced, and the motor mounting bracket far away from the side wall of the air duct and the large-gap protective net cover are adopted, the static pressure value of the fan is greatly increased (under the condition that the air volume is not changed); or the air volume of the fan is greatly increased (under the condition that static pressure is not changed), and the static pressure efficiency is greatly higher than that of a common fan.

Description

TECHNICAL FIELD

[0001] The utility model relates to axial flow fan technical field, especially a static pressure promotion type axial flow fan. BACKGROUND

[0002] Axial flow fan is a kind of ventilation machinery that makes gas flow along the axis and improves its pressure to achieve the purpose of conveying gas by input mechanical energy.When working, gas flows along the direction parallel to the fan shaft, that is, gas enters the fan axially, and still flows out axially after passing through impeller and other components, which is the origin of the name "axial flow".Axial flow fan can be widely applied to water-air, liquid-air, fluorine-air and oil-air equipment in the fields of wind power / photovoltaic new energy, energy storage, power transmission and transformation engineering, ship and ocean engineering, big data center, radar electronics, aerospace launch, engineering machinery, refrigeration and air conditioning, grain storage, dust explosion and other fields, for ventilating and heat dissipating various heat exchangers in the above-mentioned occasions.

[0003] Therefore, the conventional axial flow fan on the market has products with different specifications, sizes and power numbers, and its structure usually includes: fan straight air guide cylinder, electric motor is fixed in the middle through support, impeller is installed at the output shaft of electric motor and locked, protective mesh cover is installed at the air outlet end of straight air guide cylinder, and electric motor drives impeller to rotate after being powered on;the air inlet end of fan straight air guide cylinder can be installed on customer unit to form a complete unit;the performance of fan is usually matched according to the requirements of unit design personnel.The fan products with different performances can be formed by selecting appropriate impeller load and motor with corresponding power, different impeller shapes and impeller diameters to meet the selection needs of different customers.

[0004] The existing technical scheme has the following defects: although the matching scheme can select fan products that meet the general needs of users, it is inconvenient to greatly improve the static pressure value of fan or greatly increase the air volume of fan under the condition that the power consumption of motor remains unchanged.The conventional axial flow fan has the characteristics of large air volume and low static pressure, however, in actual application process, users must use higher resistance heat exchangers to reduce the cost or volume of heat exchange equipment, which leads to the need for larger static pressure value of the equipped axial flow fan.The power of ordinary axial flow fan needs to be greatly increased, the speed needs to be increased or the diameter of impeller needs to be increased to achieve this, which not only increases the cost of fan, but also often leads to the fact that there is no suitable fan product to be used. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a static pressure promotion type axial flow fan to solve the defects of the existing axial flow fan that is inconvenient to greatly improve the static pressure value of fan or greatly increase the air volume of fan under the condition that the power consumption of motor remains unchanged.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a static pressure lifting type axial flow fan, comprising a combined air duct:

[0007] The low-resistance plate type motor support is installed on the fixed ring of the low-resistance plate type motor support, the motor is installed on the fixed ring, the output shaft of the motor is matched and locked with the impeller through the shaft coupling, the protective mesh cover is installed on the conical side flange end of the combined air duct, and the motor junction box is installed on the outer side of the conical part of the combined air duct.

[0008] Preferably, the length of the linear part of the combined air duct is determined based on the height of the impeller, the effective angle of the conical part of the combined air duct is 13-30 degrees, the combined air duct is provided with a linear part and a conical part, and the outer side of the cylinder wall of the combined air duct is welded with a cylinder wall reinforcing rib.

[0009] Preferably, the low-resistance plate type motor support is arranged away from the side wall of the fan air duct.

[0010] Preferably, the protective mesh cover is a large-gap mesh cover.

[0011] Preferably, the motor and the combined air duct are centrally installed through the low-resistance plate type motor support, the impeller and the combined air duct are kept concentric, and the combined air duct and the low-resistance plate type motor support are connected through bolt locking.

[0012] The static pressure lifting type axial flow fan has the advantages that:

[0013] The combined air duct, the low-resistance plate type motor support, the motor, the impeller and the protective mesh cover are designed.

[0014] Further, the inner wall of the combined air duct is provided with the low-resistance plate type motor support, so that the side wall of the combined air duct is smooth and free of structural members that can cause airflow turbulence, and the airflow resistance at the outlet of the fan is further reduced.

[0015] Further, since the airflow greatly reduces the outlet air speed and reduces the outlet dynamic pressure through the conical outlet air duct, the fan static pressure value is greatly improved (under the condition that the air volume is unchanged), or the fan air volume is greatly improved (under the condition that the static pressure is unchanged), and the static pressure efficiency is greatly higher than the performance of the ordinary fan. The series of axial flow fans of the application have the following performance: under the condition that the motor power consumption is unchanged, the same specification fan impeller and motor are used, the fan static pressure value is greatly improved (under the condition that the air volume is unchanged, the static pressure is improved by 43% to 233%), or the fan air volume is greatly improved (under the condition that the static pressure is unchanged, the air volume is improved by 9% to 16%), the static pressure efficiency is greatly higher than the performance of the ordinary fan (the static pressure efficiency is improved by 14% to 27%), and a new breakthrough in the air dynamic performance of the fan under the condition of controllable cost is realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a partial sectional view structural schematic diagram of the utility model;

[0017] Fig. 2 It is a front view structural schematic diagram of the utility model.

[0018] The reference signs in the drawing are explained as follows: 1, combined air duct; 2, low-resistance plate type motor support; 3, impeller; 4, motor; 5, protective mesh cover; 6, cylinder wall reinforcing rib; 7, motor junction box. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Please refer to Figs. 1-2 The utility model provides a kind of static pressure lifting type axial flow fan, including 1.

[0021] Refer to Fig. 1 And Fig. 2As shown, the combined air duct 1 is provided with a low-resistance plate motor support 2 at the conical side flange end, a motor 4 is installed on the fixing ring of the low-resistance plate motor support 2, a coupling is matched and locked with an impeller 3 at the output shaft of the motor 4, a protective mesh cover 5 is installed at the conical side flange end of the combined air duct 1, a motor junction box 7 is installed outside the cylinder wall of the conical part of the combined air duct 1, the length of the straight part of the combined air duct 1 is determined based on the height of the impeller, the effective angle of the conical part of the combined air duct 1 is 13°-30°, the combined air duct 1 is provided with a straight line and a conical part, which can reduce the outlet air speed of the fan, reduce the outlet dynamic pressure, and thus realize the essential improvement of the outlet static pressure, the cylinder wall of the combined air duct 1 is welded with a cylinder wall reinforcing rib 6, which improves the structural strength of the air duct, the low-resistance plate motor support 2 is arranged on the side wall away from the fan guide air duct, which ensures that the side wall of the air duct is smooth and free of structural members that can cause airflow turbulence, further reducing the airflow resistance at the outlet of the fan, the protective mesh cover 5 adopts a large-gap mesh cover, the impeller 3 is away from the outlet of the fan and has a sufficient safety distance, so that the fan can meet the safety specifications and further reduce the airflow resistance at the outlet of the fan, the motor 4 and the combined air duct 1 are centrally installed through the low-resistance plate motor support 2, the impeller 3 and the combined air duct 1 are concentric, and the combined air duct 1 and the low-resistance plate motor support 2 are connected by bolt locking.

[0022] By starting the motor 4 to drive the impeller 3 to rotate, since the impeller 3 is away from the outlet of the fan, a large-gap protective mesh cover 5 can be adopted to further reduce the airflow resistance at the outlet of the fan while ensuring a safety distance; since the low-resistance plate motor support 2 is installed on the inner wall of the combined air duct 1, the side wall of the combined air duct 1 can be ensured to be smooth and free of structural members that can cause airflow turbulence, further reducing the airflow resistance at the outlet of the fan; since the airflow passes through the conical outlet air duct to greatly reduce the outlet air speed and reduce the outlet dynamic pressure, the static pressure value of the fan is greatly improved under the condition that the air volume remains unchanged, or the air volume of the fan is greatly improved under the condition that the static pressure remains unchanged, and the static pressure efficiency is greatly higher than that of ordinary fans.

[0023] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A static pressure lifting type axial flow fan, comprising a combined air duct (1); Characterized in that: A low-resistance plate type motor support (2) is installed at the conical side flange end of the combined air duct (1), a motor (4) is installed on the fixing ring of the low-resistance plate type motor support (2), a impeller (3) is installed and locked through a shaft coupling at the output shaft of the motor (4), a protective mesh cover (5) is installed at the conical side flange end of the combined air duct (1), and a motor junction box (7) is installed on the outer side of the cylinder wall of the conical part of the combined air duct (1).

2. A hydrostatically-lifting axial fan according to claim 1, characterized in that: The length of the straight part of the combined air duct (1) is determined based on the height of the impeller, the effective angle of the conical part of the combined air duct (1) is 13°-30°, the combined air duct (1) is arranged in a straight line + conical shape, and a cylinder wall reinforcing rib (6) is welded on the outer side of the cylinder wall of the combined air duct (1).

3. A type of aerodynamic axial flow fan of the static pressure lifting type according to claim 1, characterized in that: The low-resistance plate type motor support (2) is arranged away from the side wall of the fan air duct.

4. A hydrostatically-lifting axial fan according to claim 1, characterized in that: The protective mesh cover (5) adopts a large-gap mesh cover.

5. A hydrostatically-lifting axial fan according to claim 1, characterized in that: The motor (4) and the combined air duct (1) are centrally installed through the low-resistance plate type motor support (2), the impeller (3) and the combined air duct (1) are kept concentric, and the combined air duct (1) and the low-resistance plate type motor support (2) are connected by bolt locking.

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