A high-efficiency and high-volume centrifugal induced fan

Abstract

The present invention discloses a high-efficiency, large-air-volume centrifugal induced fan, comprising a casing, a volute is provided in the casing, the volute is provided with an air inlet and an air outlet channel that are interconnected, a collector is provided at the air inlet, an impeller is provided in the volute, a motor for driving the impeller to rotate is installed in the casing, the volute adopts a semi-volute structure, the volute is provided with a multi-volute tongue flow guide component, and the air outlet channel of the volute is connected with a nozzle with adjustable wind direction. The present invention uses a semi-volute structure with a multi-volute tongue flow guide component to evenly separate the outlet cross-section of the fan volute, reduce airflow disturbance, and improve the efficiency of the fan. An adjustable guide vane structure is provided at the air outlet, and the induction effects such as induced air volume, ejection distance, and coverage area are improved by adjusting the deflection angle of the double-layer guide vane. The present invention has high efficiency, large coverage area, and small space occupied by equipment installation.

Description

Technical Field

[0001] The present invention relates to the technical field of fan equipment, and more specifically to a high-efficiency and large-air-volume centrifugal induced fan. Background Art

[0002] The induced fan is a ventilation device used to induce fresh air or processed air from the outside and deliver it to the required area without air ducts to achieve the best indoor airflow organization and achieve efficient and economical ventilation and ventilation effects. It is mainly used for large air volume ventilation in underground parking garages, sports and commercial venues, large factories, subway depot operation warehouses and joint maintenance warehouses. Since no ventilation ducts are used, by adjusting the operation mode of the induced fan system, the organization path of the airflow can be changed in time according to different ventilation needs or smoke exhaust requirements by using the intelligent control system, so that the whole space can be ventilated without dead corners, meeting the ventilation and fire smoke exhaust requirements.

[0003] Induction fans are usually hung on the top or both sides of the room. By changing the spatial layout, the ejected airflow produces a suction effect on the surrounding air, thereby inducing the flow of surrounding gas, and achieving the purpose of directional gas delivery through multi-stage relays. With the development of the times, the ventilation volume of the induced fans required in the project is constantly increasing, and due to the height restrictions of the installation space and the installation angle restrictions of the inlet and outlet, the traditional small-flow induced fans can no longer achieve good ventilation effects. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-efficiency, large-air-volume centrifugal induced fan having the characteristics of greater carrying air volume and longer range, large coverage area, high ventilation efficiency, and small space occupied by equipment installation.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-efficiency, large-air-volume centrifugal induced blower, comprising a casing, a volute is arranged in the casing, the volute is provided with an air inlet and an air outlet channel which are interconnected, a collector is arranged at the air inlet, an impeller is arranged in the volute, a motor for driving the impeller to rotate is installed in the casing, the volute adopts a semi-volute structure, a multi-volute tongue guide assembly is arranged in the volute, and the air outlet channel of the volute is connected with a nozzle with adjustable wind direction.

[0006] The box is fixed to the fan base by bolts, the collector is fixed to the fan volute by bolts, and the nozzle is fixed to the fan box by bolts. The motor adopts EC DC brushless variable frequency motor, which has compact structure and light weight, can reduce the size and weight of the fan. At the same time, the EC motor has the advantages of easy operation, small vibration, low noise, high speed control efficiency, good speed regulation performance, high energy saving and high efficiency. When running at low load, the energy consumption is significantly reduced. Compared with conventional motors with the same output power, the energy saving efficiency can reach more than 50%.

[0007] When the present invention is working, the motor drives the impeller to rotate and drives the airflow to enter the volute through the collector and then be ejected through the nozzle at the rear end. The use of a half volute can increase the air volume of the impeller, and the multi-volute tongue flow guide assembly can play the role of flow balancing and flow diversion, which helps to increase the air flow range and increase the induced air volume. The nozzle can adjust the air outlet direction and air volume to ensure that the fan's ejection distance, coverage area, induced air volume, etc. reach the expected values.

[0008] Furthermore, the multi-volute tongue flow guide assembly includes a plurality of volute tongues and a plurality of flow guide plates. The volute tongues are arranged along the circumference of the impeller on the projection side of the air outlet, and the flow guide plates are arranged in the volute according to the direction of the airflow out of the impeller and the flow guide direction. The plurality of volute tongues are used to uniformly discharge the airflow in the width direction. The shape of the flow guide plates is determined according to the flow field characteristics. The two sides are installed on the two side plates of the volute to evenly separate the outlet cross-section of the fan volute, and the discharged airflow can be guided to the outlet axis direction. The multi-volute tongue flow guide assembly allows the air in the volute to be evenly discharged over a width that is about twice the diameter of the impeller, reducing the secondary flow disturbance caused by the large radial size of the volute, and greatly improving the ventilation efficiency of the induced fan. In addition, the semi-volute structure with multiple volute tongue guide components can also reduce the outlet velocity of the induced fan impeller within the shortest distance and smallest space, which can not only greatly reduce the aerodynamic loss when the airflow is turned, but also greatly reduce the external dimensions of the fan volute, so that it can be installed in the fan casing without difficulty, effectively reducing the production and assembly process cost of the induced fan unit and improving production efficiency.

[0009] Furthermore, the impeller includes a wheel disc, which adopts a streamlined bowl-shaped structure. The impeller is composed of a wheel cover, blades, a wheel disc, a shaft sleeve and other components. The wheel disc adopts a streamlined bowl-shaped structure and is spin-formed by a mold. The well-designed streamlined bowl-shaped structure can not only reduce flow losses and improve the efficiency of the fan, but also reduce the noise of the fan.

[0010] Furthermore, a mounting cylinder is installed in the housing, the motor is installed inside the mounting cylinder, and the impeller is installed on the output shaft end of the motor. The mounting cylinder is connected and fixed to the fan housing by bolts, and the wheel disc adopts a streamlined bowl-shaped structure, which can make full use of the internal space of the fan impeller, wrap part of the motor size in the wheel disc, and effectively reduce the external dimensions of the induced fan equipment.

[0011] Furthermore, a motor dust cover is installed on the top of the installation cylinder to prevent impurities, foreign objects, etc. from entering the motor to cause damage and affect work efficiency.

[0012] Furthermore, the impeller is a high-efficiency centrifugal fan impeller with a large flow coefficient greater than 0.25, a high specific speed greater than 100, and a low pressure coefficient less than 0.35, which is between axial flow and conventional centrifugal impellers. It can greatly reduce the turning angle of the airflow, reduce the "pneumatic nozzle" effect, reduce flow losses, and increase the ventilation volume of the system, which is beneficial to improving the energy utilization efficiency of the system operation and meeting the needs of large air volume systems.

[0013] Furthermore, the collector is arc-shaped, and a safety net is provided at the air inlet of the collector. The collector is formed by die pressing, and the well-designed streamlined collector can accelerate the airflow therein, and ensure a uniform air intake velocity field with little pressure loss, thereby improving the efficiency of the induced fan and reducing the noise of the induced fan.

[0014] Furthermore, the nozzle adopts a double-layer adjustable guide vane structure, and the nozzle includes an outer frame, and the outer frame is provided with a main axis 1 perpendicular to its horizontal plane and a main axis 2 perpendicular to its vertical plane, respectively, and the main axis 1 and the main axis 2 are respectively connected to the inner guide vane and the outer guide vane, and the outer frame is provided with an actuator 1 and an actuator 2 for driving the inner guide vane and the outer guide vane respectively. The deflection angles of the inner guide vane and the outer guide vane are adjusted by the actuator 1 and the actuator 2 respectively, and the inner guide vane can rotate along the main axis 1 perpendicular to its horizontal plane, and the outer guide vane can rotate along the main axis 2 perpendicular to its vertical plane, thereby controlling the parameters such as the ejection distance, the coverage area, and the deflected air volume.

[0015] Furthermore, a plurality of the outer guide vanes are provided along the height direction of the outer frame, and adjacent outer guide vanes are synchronously driven by gears.

[0016] The adjustment angle of the inner guide vane is 45-135 degrees, and the adjustment angle of the outer guide vane is 0-60 degrees. For larger plants, this induced fan system can be used to adjust the angle of the inner guide vane left and right, with an adjustment angle of 45-135 degrees, so that the air volume is induced to a wider area; for higher plants, this induced fan system can be used to adjust the angle of the outer guide vane downward, with an adjustment angle of 0-60 degrees, so that the air volume is induced near the ground.

[0017] Furthermore, the nozzle is rectangular, and the height-to-width ratio of its outlet is 0.60-0.63. With this structure, the flow velocity near the ground is evenly distributed and the ventilation effect is optimal. This design can achieve the best combination of fan range, coverage area, and induced air volume.

[0018] In summary, the present invention uses a semi-volute structure with multiple volute tongue guide components to evenly separate the outlet cross-section of the fan volute, reduce airflow disturbance, and improve fan efficiency. An adjustable guide vane structure is provided at the air outlet, and the induction effects such as induced air volume, ejection distance, and coverage area are improved by adjusting the deflection angle of the double-layer guide vanes. The present invention has high efficiency, large coverage area, and small space occupied by equipment installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the volute multi-volute tongue flow guide assembly in the present invention;

[0021] Figure 3 It is a schematic diagram of the impeller structure in the present invention;

[0022] Figure 4 It is a cross-sectional view of the nozzle structure in the present invention.

[0023] Marking instructions: 1. Base; 2. Safety net; 3. Box; 4. Collector; 5. Impeller; 6. Mounting cylinder; 7. Volute; 8. Nozzle; 9. Guide plate; 10. Motor; 11. Dust cover; 12. Volute tongue; 51. Wheel cover; 52. Blade; 53. Wheel disc; 54. Bushing; 81. Inner guide vane; 82. Outer guide vane; 83. Outer frame; 84. Gear; 85. Main shaft one; 86. Actuator one. DETAILED DESCRIPTION

[0024] Reference Figures 1 to 4 The specific implementation manner of the high-efficiency and large-air-volume centrifugal induced blower of the present invention is further described.

[0025] A high-efficiency, high-volume centrifugal induced fan, such as Figure 1 As shown, it includes a base 1, a housing 3, a collector 4, an impeller 5, a volute 7, and a nozzle 8 which are arranged in sequence according to the direction of airflow movement. The housing 3 is connected and fixed to the base 1 by bolts; the collector 4 is connected and fixed to the air inlet of the volute 7 by bolts; the volute 7 is installed inside the housing 3; a motor 10 is installed inside the housing 3, and an impeller 5 is installed on the extended shaft end of the motor 10; a multi-volute tongue guide assembly is arranged inside the fan volute 7; and the nozzle 8 is connected and fixed to the housing 3 by bolts. The volute 7 adopts a semi-volute structure, and a multi-volute tongue guide assembly is arranged inside the volute 7, and the air outlet channel of the volute 7 is connected to the nozzle 8 with adjustable wind direction.

[0026] Motor 10 adopts EC brushless DC variable frequency motor, which has compact structure and light weight, and can reduce the size and weight of the fan. Meanwhile, EC motor 10 has the advantages of convenient operation, small vibration, low noise, high speed control efficiency, good speed regulation performance, high energy saving and high efficiency. When running at low load, the energy consumption is significantly reduced. Compared with conventional motors with the same output power, the energy saving efficiency can reach more than 50%.

[0027] When the present invention is working, the motor 10 drives the impeller 5 to rotate and drives the airflow to enter the volute 7 through the collector 4 and spray out through the nozzle 8 at the rear end. The use of a half volute can increase the air volume of the impeller 5, and the multi-volute tongue guide assembly can play the role of flow balancing and guiding, which helps to increase the air flow range and increase the induced air volume. The nozzle 8 can adjust the air outlet direction and air volume to ensure that the fan push distance, coverage area, induced air volume, etc. reach the expected value.

[0028] In this embodiment, the multi-volute tongue guide assembly includes a plurality of volute tongues 12 and a plurality of guide plates 9. The volute tongues 12 are arranged along the circumference of the impeller 5 on the projection side of the air outlet. The guide plates 9 are arranged in the volute 7 according to the airflow outflow from the impeller 5 and the guide direction. Figure 2 As shown, three volute tongues 12 and three guide plates 9 are provided. Multiple volute tongues 12 are used to uniformize the exhaust airflow in the width direction. The shape of the guide plate 9 is determined according to the flow field characteristics. The two sides are installed on the two side plates of the volute 7 to evenly separate the outlet cross-section of the fan volute 7, and the exhausted airflow can be guided to the outlet axis direction. The multi-volute tongue guide assembly allows the air in the volute 7 to be evenly discharged over a width about twice the diameter of the impeller 5, reducing the secondary flow disturbance caused by the large radial size of the volute 7, and greatly improving the ventilation efficiency of the induced fan. In addition, the semi-volute structure of the multi-volute tongue guide assembly can also reduce the outlet speed of the induced fan impeller 5 in the shortest distance and the smallest space, which can not only greatly reduce the aerodynamic loss when the airflow turns, but also greatly reduce the external dimensions of the fan volute 7, so that it can be installed in the fan housing 3 without difficulty, effectively reducing the production and assembly process cost of the induced fan unit and improving production efficiency.

[0029] like Figure 3 As shown, the impeller 5 includes a wheel disc 53, and the wheel disc 53 adopts a streamlined bowl-shaped structure. The impeller 5 is composed of a wheel cover 51, blades 52, a wheel disc 53, a shaft sleeve 54 and other components. The wheel disc 53 adopts a streamlined bowl-shaped structure and is formed by mold spin forming. The well-designed streamlined bowl-shaped structure can not only reduce flow losses and improve the efficiency of the fan, but also reduce the noise of the fan.

[0030] In this embodiment, preferably, a mounting cylinder 6 is installed in the housing 3, the motor 10 is installed inside the mounting cylinder 6, and the impeller 5 is installed on the output shaft end of the motor 10. The mounting cylinder 6 is connected and fixed to the fan housing 3 by bolts, and the wheel disc 53 adopts a streamlined bowl-shaped structure, which can make full use of the internal space of the fan impeller 5, and wrap part of the motor 10 size in the wheel disc 53, effectively reducing the external dimensions of the induced fan equipment.

[0031] Preferably, in this embodiment, a dust cover 11 of the motor 10 is installed on the top of the installation cylinder 6 to prevent impurities, foreign objects, etc. from entering the motor 10 to cause damage and affect the working efficiency.

[0032] Preferably, in this embodiment, the impeller 5 is a high-efficiency centrifugal fan impeller 5 with a large flow coefficient greater than 0.25, a high specific speed greater than 100, and a low pressure coefficient less than 0.35, which is between the axial flow and conventional centrifugal impellers 5. It can greatly reduce the turning angle of the airflow, reduce the "pneumatic nozzle 8" effect, reduce flow losses, and increase the ventilation volume of the system, which is beneficial to improving the energy utilization efficiency of the system operation and meeting the needs of large air volume systems.

[0033] In this embodiment, the current collector 4 is preferably in an arc shape (refer to Figure 1 The collector 4 is formed by pressing with a mold. The well-designed streamlined collector 4 can accelerate the airflow therein and ensure the uniformity of the air intake velocity field with little pressure loss. This improves the efficiency of the induced fan and reduces the noise of the induced fan.

[0034] In this embodiment, the nozzle 8 preferably adopts a double-layer adjustable guide vane structure, combined with Figure 1 and Figure 4 As shown, the nozzle 8 includes an outer frame 83, and the outer frame 83 is provided with a main shaft 1 85 perpendicular to its horizontal plane and a main shaft 2 perpendicular to its vertical plane, respectively. The main shaft 1 85 and the main shaft 2 are respectively connected to the inner guide vane 81 and the outer guide vane 82, and the outer frame 83 is provided with an actuator 1 86 and an actuator 2 for respectively driving the inner guide vane 81 and the outer guide vane 82. The deflection angles of the inner guide vane 81 and the outer guide vane 82 are adjusted by the actuator 1 86 and the actuator 2 respectively. The inner guide vane 81 can rotate along the main shaft 1 85 perpendicular to its horizontal plane, and the outer guide vane 82 can rotate along the main shaft 2 perpendicular to its vertical plane, thereby controlling the parameters such as the ejection distance, the coverage area, and the deflected air volume.

[0035] Preferably, in this embodiment, a plurality of outer guide vanes 82 are provided along the height direction of the outer frame 83 , and adjacent outer guide vanes 82 are synchronously driven via gears 84 .

[0036] The adjustment angle of the inner guide vane 81 is 45-135 degrees, and the adjustment angle of the outer guide vane 82 is 0-60 degrees. For a larger plant using this induced fan system, the angle of the inner guide vane 81 can be adjusted left and right, and the adjustment angle is 45-135 degrees, so that the air volume is induced to a wider area; for a higher plant using this induced fan system, the angle of the outer guide vane 82 can be adjusted downward, and the adjustment angle is 0-60 degrees, so that the air volume is induced near the ground.

[0037] Preferably, in this embodiment, the nozzle 8 is rectangular, and the height-to-width ratio of its outlet is 0.60-0.63. With this structure, the flow velocity near the ground is evenly distributed, and the ventilation effect is optimal. This design can achieve the best combination of fan range, coverage area, and induced air volume.

[0038] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-efficiency, large-air-volume centrifugal induced fan, characterized in that: It comprises a box body, a volute is arranged in the box body, the volute is provided with an air inlet and an air outlet channel which are interconnected, a collector is arranged at the air inlet, an impeller is arranged in the volute, a motor for driving the impeller to rotate is installed in the box body, the volute adopts a semi-volute structure, a multi-volute tongue flow guide component is arranged in the volute, and a nozzle with adjustable wind direction is connected to the air outlet channel of the volute; The multi-volute tongue flow guide assembly includes a plurality of volute tongues and a plurality of flow guide plates, wherein the volute tongues are arranged along the circumference of the impeller on the projection side of the air outlet, and the flow guide plates are arranged in the volute according to the direction of airflow out of the impeller and the flow guide direction; The nozzle adopts a double-layer adjustable guide vane structure, and the nozzle includes an outer frame, and the outer frame is provided with a main shaft 1 and a main shaft 2 which are respectively perpendicular to its horizontal plane and its vertical plane, respectively, and the main shaft 1 and the main shaft 2 are respectively connected with an inner guide vane and an outer guide vane, and the outer frame is provided with an actuator 1 and an actuator 2 which respectively drive the inner guide vane and the outer guide vane; A plurality of outer guide vanes are provided along the height direction of the outer frame, and adjacent outer guide vanes are synchronously driven by gears.

2. The high-efficiency, large-air-volume centrifugal induced blower according to claim 1 is characterized in that: The impeller comprises a wheel disc, and the wheel disc adopts a streamlined bowl-shaped structure.

3. The high-efficiency, large-air-volume centrifugal induced blower according to claim 1 is characterized in that: A mounting cylinder is installed in the box body, the motor is installed inside the mounting cylinder, and the impeller is installed on the output shaft end of the motor.

4. The high-efficiency, large-air-volume centrifugal induced blower according to claim 3 is characterized in that: A motor dust cover is installed on the top of the installation cylinder.

5. The high-efficiency, large-air-volume centrifugal induced blower according to claim 1 is characterized in that: The collector is arc-shaped, and a safety net is provided at the air inlet of the collector.

6. The high-efficiency, large-air-volume centrifugal induced blower according to claim 1, characterized in that: The nozzle is rectangular, and the height-to-width ratio of its outlet is 0.60-0.63.

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