Industrial cooling fan system

Abstract

The utility model discloses an industrial cooling fan system in the technical field of ventilation mechanical equipment, which comprises an air inlet current collector and an axial flow fan, the air outlet end of the axial flow fan is connected with a direct connection type symmetrical cooling system, the axial flow fan comprises a shell, a fairing and a motor, and one side, facing the fairing, of the output shaft end of the motor is in transmission connection with an impeller; the direct connection type symmetrical cooling system is provided with a flow guide fan cover extending in the length direction of a cooled object and symmetrically-arranged cooling spray pipes, and air outlets facing the cooled object are formed in the cooling spray pipes. According to the device, the impeller of the axial flow fan is driven by the motor to rotate to suck air, the entered air is discharged into the direct-connection type symmetrical cooling system in the axial direction under the pushing of the impeller blades and then is sprayed out from the air outlet to cool a cooled object, and the device has the characteristics of large air volume, low energy consumption and low noise, is stable in operation, simple in structure and convenient to operate, and is suitable for popularization and application. And the device is easy to install and daily use and maintain, and is suitable for being used in industrial production hot rolling, galvanization and color spraying cooling process links.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation machinery equipment, in particular to an industrial cooling fan system. Specifically, it is a special cooling fan system used in the cooling processes of hot rolling, galvanizing, and color spraying in industrial production. It is required to have uniform air flow, stable operation, low noise, be conveniently installed in various links of industrial production, and be suitable for maintenance control and batch installation. Background Art

[0002] There are many process links that require air cooling in the machinery industry and petrochemical fields. Traditionally, according to the system situation, the total amount of cooling air blowing required on a production line is calculated, and a single fan device is used as the air source. Then, branch pipelines are connected to the air outlets at each required process position, resulting in many problems. The most concentrated one is that the pipeline laying generally has a very poor consistency with the design scheme, resulting in a large error in the required air pressure parameters. Secondly, the pipeline design itself is very unreasonable, which will inevitably cause many losses during the process. And the entire process cooling link is concentrated on a large-power fan. The equipment is huge and heavy. Once it is damaged, basically the entire production line will stop running, and it will be difficult to repair and maintain. Coupled with the poor parameter performance of the equipment provided by many fan manufacturers, the operating area and the achievable parameter indicators are exaggerated, causing another mismatch with the design. Therefore, in practical applications, there are either unsatisfactory effects or a great waste of energy.

[0003] The Chinese Patent Database published a direct injection barrel-type centrifugal fan for process cooling, with the publication number: CN217633126U and the publication date: October 21, 2022. The device includes a casing assembly, a centrifugal impeller, an internal B5 structure motor, and a direct-connected cooling spray hole unit assembled into one body. The casing assembly consists of an outer casing, a rear guide vane, and an inner air cylinder. Both the outer casing and the inner air cylinder are set as straight cylinders. One end of the outer casing is set as an air inlet, and the air outlet at the other end is connected to the direct-connected cooling spray hole unit. The output shaft of the internal B5 structure motor is set towards the air inlet, and the centrifugal impeller is positioned and connected. The direct-connected cooling spray hole unit is provided with a diversion air hood extending along the length of the cooling object and a spray port facing the cooling object. This device is used to cool the steel plate (steel coil) that has just come out of the zinc bath in the galvanized steel plate production line. The fan is directly connected to the cooling air outlet, and several are arranged in parallel on both sides of the steel coil to form an operation unit. Each galvanized steel coil production line is equipped with 3 to 4 units.

[0004] While this arrangement of small fans with duct nozzles effectively addressed the shortcomings of traditional designs, it still had some drawbacks. First, the original small axial fans suffered from insufficient pressure and excessive noise, so a special cylindrical centrifugal fan was adopted. While this solved the pressure shortfall, its efficiency was significantly lower than that of large axial fans. Second, seasonal variations in climatic conditions necessitated control of air volume. Whether using a one-to-one inverter or multiple units controlled by an inverter, the circuit system became complex. Furthermore, the presence of high levels of metal dust and moisture in the operating environment resulted in a high failure rate. Furthermore, the fan motors all used small, sealed bearings, which had a shorter lifespan than larger motors requiring grease refills, leading to frequent downtime. Third, despite excellent manufacturing consistency for the cooling of multiple fans, when a single fan failed, the fans on either side needed to be shut down immediately to avoid temperature differences, complicating circuit control. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide an industrial cooling fan system. The unit control is controlled by a single frequency converter for a single fan, which greatly reduces the complexity of the control system circuit, reduces the incidence of electrical failures, improves the working efficiency of the fan, and reduces the energy consumption of the system.

[0006] The purpose of the present utility model is achieved as follows: an industrial cooling fan system, comprising an air inlet collector, an axial fan installed at the rear end of the air inlet collector, the air outlet end of the axial fan being connected to a direct-connected symmetrical cooling system, the axial fan comprising a casing, the air inlet end of the axial fan being provided with a fairing, the fairing being arranged toward one end of the air inlet collector, the axial fan further comprising a motor, the output shaft end of the motor being transmission-connected with an impeller toward one side of the fairing; the direct-connected symmetrical cooling system comprising a guide hood extending along the length direction of a cooling object, the guide hood being symmetrically arranged on both sides of the cooling object for diversion, and the guide hood being provided with an air outlet facing the cooling object.

[0007] When the utility model is working, the impeller of the axial flow fan is driven by the motor to rotate, and the air is sucked in from the air inlet. Under the push of the impeller blades, the incoming air is discharged axially into the direct-connected symmetrical cooling system, and then sprayed out from the air outlet to cool the cooling object. It has the characteristics of large air volume, low energy consumption and low noise, and has stable operation, simple structure, and is easy to install and maintain in daily use.

[0008] Furthermore, the air outlet is a long knife-shaped air outlet, and a plurality of air outlets are arranged at intervals on the air outlet end surface of the air guide cover.

[0009] Furthermore, the distance between two adjacent air outlets is greater than the distance between the cross sections of the air outlets.

[0010] Furthermore, the air inlet of the axial flow fan is an arc-shaped collecting air inlet with an enlarged outer diameter, and a protective net is provided at the outer end of the air inlet.

[0011] Furthermore, the number of axial flow fans is 1 or 2.

[0012] Furthermore, the axial flow fan is of large or medium size, and the blades of the impeller are of a high-efficiency airfoil-shaped structure made of cast aluminum alloy at low pressure.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] First, the multiple fans in an operating unit in the existing technology are replaced with one or two large and medium-sized axial fans. The blades of the axial fans adopt a high-efficiency airfoil-shaped structure cast by low-pressure casting of cast aluminum alloy, and an arc-shaped air inlet collector is set at the air inlet of the axial fan. Compared with the small fans used in the existing technology, the efficiency is increased by 15%, and the energy efficiency of the integrated unit is reduced by 20%.

[0015] Second, the integrated unit controls a single axial fan through a single inverter, which greatly reduces the complexity of the control system circuit, reduces the incidence of electrical failures, improves the safety and stability of the cooling fan system, and reduces maintenance costs.

[0016] Third, the drive motor of the axial flow fan adopts a high-power motor with an open bearing, which improves the working efficiency of the motor. The daily maintenance of the motor is carried out through the oiling assembly of the axial flow fan, which extends the service life of the motor.

[0017] Fourth, the cooling system of this device adopts a direct-connected symmetrical air outlet setting to ensure that both sides of the cooling object receive the same wind. Compared with the dot matrix circular hole nozzles used in the prior art, the knife-shaped air outlet in this device can greatly reduce the resistance of the airflow outlet end, avoid the generation of airflow vortexes, and help reduce system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a direct-injection cylinder-type centrifugal fan for process cooling in the prior art.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure enlarged at point A.

[0020] Figure 3 The present invention is a schematic diagram of the in-line arrangement of the cooling system of a direct-injection cylindrical centrifugal fan for process cooling in the prior art.

[0021] Figure 4 This is a schematic diagram of the structure of the utility model Figure 1 .

[0022] Figure 5 is Figure 4 an enlarged structural schematic diagram of part B in

[0023] Figure 6 a structural schematic diagram of the direct-connected symmetric cooling system of the present utility model.

[0024] Figure 7 is Figure 6 an enlarged structural schematic diagram of part C in

[0025] Figure 8 a structural schematic of the present utility model Figure 2 .

[0026] In the above figure, 1 is a protective net, 2 is an air inlet collector, 3 is a fairing, 4 is an impeller, 5 is a motor, 6 is a housing, 7 is a direct-connected symmetric cooling system, 8 is a diversion air hood, 9 is an air outlet, 10 is a cooling object, 11 is a tubular centrifugal fan, 12 is a direct injection cooling air outlet pipe, and 13 is a nozzle. Specific embodiments

[0027] Such as Figures 4 to 8 shown, an industrial cooling fan system includes an air inlet collector 2, an axial flow fan installed at the rear end of the air inlet collector 2. The air outlet end of the axial flow fan is connected to a direct-connected symmetric cooling system 7. The axial flow fan includes a housing 6. A fairing 3 is provided at the air inlet end of the axial flow fan, and the fairing 3 is arranged towards one end of the air inlet collector 2. The axial flow fan further includes a motor 5, and an impeller 4 is drivingly connected to the output shaft end of the motor 5 towards the side of the fairing 3; the direct-connected symmetric cooling system 7 includes a diversion air hood 8 extending along the length direction of the cooling object 10. The diversion air hood 8 is symmetrically arranged on both sides of the cooling object 10 for splitting the flow, and an air outlet 9 facing the cooling object 10 is provided on the diversion air hood 8.

[0028] The air outlet 9 is a long strip-shaped knife-shaped air outlet, and a plurality of them are arranged at intervals on the air outlet end face of the diversion air hood 8; the distance between adjacent two air outlets 9 is greater than the cross-sectional distance of the air outlet 9. The knife-shaped air outlet 9 reduces the resistance at the air outlet end of the air flow, avoids the generation of air flow vortices, and helps to reduce the system energy consumption.

[0029] The air inlet of the axial flow fan is an arc-shaped collector air inlet with an enlarged external diameter, and a protective net 1 is further provided at the outer end of the air inlet; through the protective net 1, sundries carried by the high-speed air flow can be prevented from entering the interior of the axial flow fan, avoiding damage to the axial flow fan, and ensuring the safe and stable operation and service life of the equipment.

[0030] One or two axial flow fans are provided. The axial flow fans are of medium and large models, and the blades of the impeller 4 are of high-efficiency airfoil structure by low-pressure casting of cast aluminum alloy; the airfoil-structured blades can push the air to flow axially, enabling the axial flow fan to generate a large air flow rate, being suitable for large-area ventilation requirements. Compared with the original small fans used, the working efficiency of the medium and large model axial flow fans can be increased by 15%.

[0031] When the utility model works, air enters from the air inlet at the front end of the air inlet collector 2. The motor 5 drives the axial flow fan to work, and the impeller 4 rotates at a high speed. The blades with airfoil structures on the impeller 4 suck in the air and push the air to flow along the axial direction, and enter the direct-connected symmetric cooling system 7. The air passes through the guide air hood 8 and is shunted to both sides of the cooling object 10, and blows out from the strip-shaped knife-shaped air outlet 9 to cool the cooling object 10 by blowing air, which can ensure that the wind forces on both sides of the cooling object 10 are the same. Compared with the dense dot matrix round hole nozzles 13 used in the prior art, the knife-shaped air outlet 9 greatly reduces the resistance at the air outlet end of the air flow, avoids the generation of air flow vortices, and helps reduce the system energy consumption.

[0032] Figures 1 to 3 The figure shows the structural schematic diagram of a direct injection barrel-shaped centrifugal fan for process cooling in the prior art. A small barrel-shaped centrifugal fan 11 is adopted, with insufficient efficiency, and multiple units need to be set up. This makes the circuit system more complex whether one-to-one frequency converter control or frequency converter control of multiple units is used to control the air volume of the control system. Coupled with the presence of a large amount of metal dust and water vapor in the operating environment, the actual operating failure rate is increased; when working, air is blown out by multiple fans. Although the consistency of the fans can be controlled, when a single fan fails, in order to avoid the occurrence of temperature difference on both sides of the cooling object caused by the continuous operation of the single-sided direct injection cooling air outlet pipe 12, the fans on the symmetric side also have to be forced to stop, which also makes the circuit control difficult and affects the overall stable operation of the unit.

[0033] In this device, multiple centrifugal fans 11 in one operation unit in the prior art are replaced by 1 or 2 medium and large-sized axial flow fans. The blades of the axial flow fans adopt a high-efficiency airfoil structure made of cast aluminum alloy by low-pressure casting. An arc-shaped air inlet collector 2 is arranged at the air inlet of the axial flow fan. Compared with the small fans used in the prior art, the efficiency is increased by 15%, and the energy efficiency of the integrated unit is decreased by 20%; after integration, the unit controls a single axial flow fan through a single frequency converter, greatly reducing the complexity of the control system circuit, reducing the incidence of electrical faults, improving the safety and stability of the cooling fan system, and reducing the maintenance cost; the drive motor 5 of the axial flow fan adopts a high-power motor with an open bearing. The working efficiency of the motor 5 is improved, and the daily maintenance of the motor 5 is implemented through the oil filling component of the axial flow fan, extending the service life of the motor 5; the cooling system of this device is a direct-connected symmetric air outlet setting, ensuring that the wind forces on both sides of the cooling object are the same. And compared with the dot matrix round hole nozzles 13 used in the prior art, the knife-shaped air outlet 9 in this device can greatly reduce the resistance at the air outlet end of the air flow, avoid the generation of air flow vortices, and help reduce the system energy consumption, and is suitable for use in the hot rolling, galvanizing, and color spraying cooling process links in industrial production.

[0034] The present utility model is not limited to the above embodiments. Based on the technical solutions disclosed by the present utility model, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. An industrial cooling fan system, characterized in that: It includes an air inlet collector and an axial flow fan installed at the rear end of the air inlet collector, the air outlet end of the axial flow fan is connected to a direct-connected symmetrical cooling system, the axial flow fan includes a casing, the air inlet end of the axial flow fan is provided with a fairing, the fairing is arranged toward one end of the air inlet collector, the axial flow fan also includes a motor, the output shaft end of the motor is connected to an impeller in a transmission manner toward one side of the fairing; the direct-connected symmetrical cooling system includes a guide air cover extending along the length direction of the cooling object, the guide air cover is symmetrically arranged on both sides of the cooling object, and the guide air cover is provided with an air outlet facing the cooling object.

2. The industrial cooling fan system according to claim 1, wherein: The air outlet is a long knife-shaped air outlet, and a plurality of air outlets are arranged at intervals on the air outlet end surface of the air guide cover.

3. An industrial cooling fan system according to claim 1, characterized in that: The distance between two adjacent air outlets is greater than the distance between the cross sections of the air outlets.

4. An industrial cooling fan system according to claim 1, characterized in that: The air inlet of the axial flow fan is an arc-shaped collecting air inlet with an enlarged outer diameter, and a protective net is provided at one end of the air inlet facing outward.

5. An industrial cooling fan system according to any one of claims 1 to 4, characterized in that: The axial flow fans are provided with 1 or 2 units.

6. An industrial cooling fan system according to any one of claims 1 to 4, characterized in that: The axial flow fan is of large or medium size, and the blades of the impeller are of a high-efficiency airfoil-shaped structure made of cast aluminum alloy at low pressure.

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