A high-efficiency centrifugal induced fan capable of back-blowing

Abstract

The present invention discloses a high-efficiency centrifugal induced fan capable of back-blowing and automatic dust removal, comprising a fan housing, wherein both ends of the fan housing are respectively provided with an air inlet and an air outlet, and a filter, a side air inlet channel, a blowing device, and a volute are sequentially installed along the air inlet toward the air outlet, a back-blowing reserved air outlet is provided at the bottom of the fan housing, a fan flow channel switching device is provided between the side air inlet channel and the back-blowing reserved air outlet, and a valve device capable of adjusting the opening and closing of the air outlet is provided at the air outlet. The present invention changes the direction of the airflow by changing the flow channel direction inside the fan, and adopts a back-blowing dust removal cleaning method, which has the advantages of good cleaning effect, simple structure, no need to add a special small cleaning fan, convenient control, small maintenance workload, safe and reliable operation, etc. The gas is disinfected by using a disinfection device to effectively prevent the occurrence and spread of pathogens.

Description

Technical Field

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

[0002] The induced fan uses the characteristics of high-speed jets in aerodynamics, and uses the high-speed airflow with high kinetic energy to induce and stir a large amount of surrounding air and bring it to a specific target direction. It is a ventilation equipment that can induce fresh air or treated air from the outside and send it to the required area without air ducts to achieve efficient and economical ventilation and air exchange effects. It is mainly used for large-volume ventilation in warehouses such as 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 operating 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 using an intelligent control system, so that ventilation without dead ends in the entire space can be achieved to meet ventilation and fire smoke exhaust requirements.

[0003] In order to prevent the service life of the induced fan equipment from being affected by the harsh environment, the induced fans used in the project are generally required to have automatic filtering and dust removal functions. Filters are installed at the air inlet of the equipment to prevent the entry of fine particles and prevent dust from hanging on the impeller and other parts. In order to reduce the maintenance cost of the induced fan equipment, the induced fan must also have a timed dust removal function to prevent dust from accumulating on the filter and equipment and affecting the equipment.

[0004] At present, the automatic dust removal function of the axial flow induced fan in the project generally adopts the back-blowing dust removal cleaning method. The axial flow induced fan can change the direction of the airflow by changing the forward and reverse rotation of the fan impeller, thereby achieving the purpose of automatic back-blowing dust removal on the filter device.

[0005] However, in principle, centrifugal induced fans, whether they are forward impellers, backward impellers, or radial impellers, cannot achieve a change in airflow direction by changing the forward or reverse rotation of the fan impeller. In particular, centrifugal induced fans generally use backward impellers, which are prone to overload once they reverse, so it is impossible to achieve the purpose of back-blowing dust removal by simply changing the impeller direction. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a high-efficiency centrifugal induced fan capable of backblowing, which changes the direction of the airflow by changing the direction of the flow channel inside the fan, thereby achieving the purpose of automatic dust removal by backblowing.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-efficiency centrifugal induced blower with automatic dust removal and backblowing, comprising a fan casing, wherein an air inlet and an air outlet are respectively arranged at both ends of the fan casing, and a filter, a side air inlet channel, a blowing device, and a volute are sequentially installed along the air inlet toward the air outlet, a backblowing reserved air outlet is arranged at the bottom of the fan casing, a fan flow channel switching device is arranged between the side air inlet channel and the backblowing reserved air outlet, and a valve device that can adjust the opening and closing of the air outlet is arranged at the air outlet.

[0008] When the induced fan needs to be back-blown for automatic dust removal, it is only necessary to control the fan flow channel switching device to open the back-blowing reserved air port on the fan housing, close the original fan air inlet pipe, open the side air inlet channel, control the valve device to close the original fan air outlet pipe, realize the flow channel direction conversion inside the fan, and enter the back-blowing mode. Then start the fan, and the rotating impeller drives the air flow to inlet from the back-blowing reserved air port of the fan housing, enter the volute, pass through the side air inlet channel connected to the volute and the back-blowing reserved air port, and finally lead to the filter device, realizing the purpose of automatic back-blowing to remove dust from the filter.

[0009] Furthermore, the side air inlet channel includes an upper air inlet and a lower air inlet, and the fan flow channel switching device includes a sliding baffle 1 that cooperates with the upper air inlet / lower air inlet and a sliding baffle 2 that cooperates with the back-blow reserved air outlet, and the sliding baffle 1 and the sliding baffle 2 are connected by a connecting rod.

[0010] When the induced fan is working normally, the fan runs forward, the lower air inlet is open, the upper air inlet and the bottom back-blowing reserved air outlet are closed, and the air flow flows through the fan air inlet, through the lower air inlet, and flows to the air outlet to form a forward air inlet pipeline; when back-blowing dust removal is required, the sliding baffle 1 is controlled to slide downward, and the sliding baffle 2 moves in the same direction, so that the lower air inlet is closed, the upper air inlet and the bottom back-blowing reserved air outlet are opened (at the same time, the valve device at the air outlet needs to be closed), the original fan forward air inlet pipeline is closed, and the air flow enters from the back-blowing reserved air outlet and flows to the filter device through the upper air inlet, so as to achieve the purpose of automatically back-blowing to remove dust from the filter. The sliding baffle 1 and the sliding baffle 2 are connected by a connecting rod to realize the conversion of the flow direction inside the fan, so that the upper air inlet and the back-blowing reserved air outlet can be closed and opened synchronously, which is convenient to control and simple to operate.

[0011] Furthermore, the fan flow channel switching device adopts a centralized control method, and controls the movement of the sliding baffle 1 and the sliding baffle 2 through an electric actuator. In a centralized control method, the electric actuator controls the up and down movement of the sliding baffle 1 and the forward and backward movement of the sliding baffle 2 through a connecting rod, so as to control the opening and closing of the back-blowing reserved air port and the upper air inlet, and control the opening and closing of the original fan forward air inlet pipeline, thereby realizing the switching of the internal flow channel direction at the fan inlet. It has the characteristics of simple structure, flexible pipeline opening and closing, and high synchronization rate.

[0012] Furthermore, the blowing device includes a fan impeller and a motor installed in the fan housing, and the motor adopts an EC integrated high-efficiency variable frequency motor. The motor is a DC brushless maintenance-free motor with a built-in intelligent control module, with various signal input interfaces, and has the characteristics of compact structure, high speed control efficiency, high intelligence, high energy saving, high efficiency, long life, low vibration, low noise, and continuous and uninterrupted operation.

[0013] Furthermore, a collector is installed in the fan housing, and the collector is arc-shaped, spin-formed by a mold, and has a smooth and streamlined surface, which can reduce turbulence and ensure a uniform air intake velocity field, thereby improving the efficiency of the induced fan and reducing the noise of the induced fan.

[0014] Furthermore, the fan impeller adopts a high-efficiency centrifugal fan impeller with a large flow coefficient, high specific speed and low pressure coefficient, which 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.

[0015] Furthermore, a nozzle device is installed at the air outlet, and the valve device is installed at the nozzle device.

[0016] Furthermore, the nozzle device adopts an electric double-layer adjustable guide vane structure, and is provided with an inner guide vane electric air valve device and an outer guide vane electric air valve device. The inner guide vane electric air valve device can be electrically adjusted in the vertical direction, and the adjustment angle is 45-135 degrees; the outer guide vane electric air valve device can be adjusted in the horizontal direction, and the adjustment angle is 0-90 degrees. The inner guide vane electric air valve device can be electrically adjusted in the vertical direction, and the adjustment angle is 45-135 degrees, so that the air volume is induced to a wider area; the outer guide vane electric air valve device can be adjusted in the horizontal direction, and the adjustment angle is 0-90 degrees, so that the air volume is induced to near the ground; this design can achieve the best combination of fan range, coverage area, and induced air volume.

[0017] The opening angles of the inner guide vane electric air valve device and the outer guide vane electric air valve device can be adjusted steplessly, so that the appropriate control mode can be selected according to the specific working conditions; the air valve device can also be set to perform automatic swing parameterized control within a certain angle according to the working conditions. For example, the outer guide vane electric air valve device can be set to perform linear automatic sweeping swing at a parameter of 30°±15°.

[0018] Furthermore, the fan casing is a flat and long structure.

[0019] Furthermore, a disinfection device is provided inside the fan housing. The disinfection device may adopt an ultraviolet lamp or the like, and can automatically disinfect the gas when the fan is running, thereby effectively preventing the occurrence and spread of pathogens.

[0020] In summary, the present invention helps to improve the airflow range and increase the induced air volume by adopting a high-efficiency centrifugal fan impeller. By adopting the intelligent control of the nozzle device, the air outlet direction and air volume can be adjusted to ensure the induced effects such as the fan's ejection distance, coverage area, and induced air volume. The present invention has high efficiency, large coverage area, and small space occupied by equipment installation; the use of filters can effectively filter and adsorb dust in the air, prevent the entry of fine particles, and prevent dust from hanging on parts such as impellers; and by changing the direction of the flow channel inside the fan to change the direction of the airflow, the reverse wind efficiency reaches more than 80% of the normal operating air volume, and backblowing automatically removes dust on the filter, preventing dust accumulation on the filter and equipment, and eliminating the impact of dust accumulation on equipment performance.

[0021] The present invention adopts a dust removal method of back-blowing dust removal, which has the advantages of good dust removal effect, simple structure, no need to add a special small cleaning fan, convenient control, small maintenance workload, safe and reliable operation, etc. By using a disinfection device to disinfect the gas, the occurrence and spread of germs can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the flow channel direction when the present invention is running forward;

[0023] Figure 2 It is a schematic diagram of the flow channel direction during the back-blowing automatic dust removal operation of the present invention.

[0024] Label instructions: 1. Fan casing; 2. Filter; 3. Fan flow channel switching device; 4. Side air inlet channel; 5. Collector; 6. Fan impeller; 7. Motor; 8. Volute; 9. Forward air inlet duct; 10. Back-blowing reserved air outlet; 11. Disinfection device; 12. Nozzle device; 13. Inner guide vane electric air valve device; 14. Outer guide vane electric air valve device; 15. Lower air inlet; 16. Upper air inlet; 17. Baffle one; 18. Baffle two; 19. Connecting rod. DETAILED DESCRIPTION

[0025] Reference Figure 1 to Figure 2 The specific implementation of a high-efficiency centrifugal induced blower capable of backblowing according to the present invention is further described.

[0026] A high-efficiency centrifugal induced fan capable of back-blowing and automatic dust removal comprises a fan casing 1, wherein an air inlet and an air outlet are respectively arranged at both ends of the fan casing 1, and a filter 2, a side air inlet channel 4, a blowing device, and a volute 8 are sequentially installed along the air inlet toward the air outlet, a back-blowing reserved air outlet 10 is arranged at the bottom of the fan casing 1, a fan flow channel switching device 3 is arranged between the side air inlet channel 4 and the back-blowing reserved air outlet 10, and a valve device capable of adjusting the opening and closing of the air outlet is arranged at the air outlet.

[0027] When the induced fan needs to be back-blown for automatic dust removal, it is only necessary to control the fan flow channel switching device 3 to open the back-blowing reserved air port 10 on the fan housing 1, close the original fan air inlet pipeline, open the side air inlet channel 4, and control the valve device to close the original fan outlet pipeline to achieve the flow channel direction conversion inside the fan and enter the back-blowing mode. Then start the blowing device, rotate and drive the air flow to enter from the back-blowing reserved air port 10 of the fan housing 1, enter the volute 8, pass through the side air inlet channel 4 connected to the back-blowing reserved air port 10 of the volute 8, and finally lead to the filter 2 device to achieve the purpose of automatically back-blowing to remove dust from the filter 2.

[0028] Preferably, in this embodiment, the side air inlet channel 4 includes an upper air inlet 16 and a lower air inlet 15, and the fan flow channel switching device 3 includes a sliding baffle 17 cooperating with the upper air inlet 16 / lower air inlet 15 and a sliding baffle 2 18 cooperating with the back-blow reserved air outlet 10, and the sliding baffle 17 and the sliding baffle 2 18 are connected by a connecting rod 19.

[0029] When the induced fan is working normally, the fan runs forward, the lower air inlet 15 is open, the upper air inlet 16 and the bottom back-blowing reserved air outlet 10 are closed, and the air flow flows through the fan air inlet through the lower air inlet 15 to the air outlet to form a forward air inlet pipeline 9; when back-blowing dust removal is required, the sliding baffle 1 17 is controlled to slide downward, and the sliding baffle 2 18 moves forward, so that the lower air inlet 15 is closed, the upper air inlet 16 and the bottom back-blowing reserved air outlet 10 are opened (at the same time, the valve device at the air outlet needs to be closed), the original fan forward air inlet pipeline 9 is closed, and the air flow enters from the back-blowing reserved air outlet 10 and flows through the upper air inlet 16 to the filter 2 device, so as to achieve the purpose of automatically back-blowing to remove dust from the filter 2. The sliding baffle 1 17 and the sliding baffle 2 18 are connected by a connecting rod 19 to realize the conversion of the internal flow channel direction of the fan, so that the upper air inlet 16 and the back-blowing reserved air outlet 10 are synchronously closed and opened, which is convenient to control and simple to operate.

[0030] In this embodiment, the fan flow channel switching device 3 preferably adopts a centralized control mode, and controls the movement of the sliding baffle 1 17 and the sliding baffle 2 18 through an electric actuator. In a centralized control mode, the electric actuator controls the up and down movement of the sliding baffle 1 17 and the forward and backward movement of the sliding baffle 2 18 through a connecting rod 19, so as to control the opening and closing of the back-blowing reserved air port 10 and the upper air inlet 16, and control the opening and closing of the original fan forward air inlet pipeline 9, thereby realizing the switching of the internal flow channel direction at the fan air inlet. It has the characteristics of simple structure, flexible pipeline opening and closing, and high synchronization rate.

[0031] In this embodiment, the blowing device preferably includes a fan impeller 6 and a motor 7 installed in the fan housing 1, and the motor 7 adopts an EC integrated high-efficiency variable frequency motor 7. The motor 7 is a DC brushless maintenance-free motor 7 with a built-in intelligent control module, with various signal input interfaces, and has the characteristics of compact structure, high speed control efficiency, high intelligence, high energy saving, high efficiency, long life, low vibration, low noise, and continuous and uninterrupted operation.

[0032] In this embodiment, the fan housing 1 is preferably provided with a collector 5, which is arc-shaped, spin-formed by a mold, and has a smooth and streamlined surface, which can reduce turbulence and ensure a uniform air intake velocity field, thereby improving the efficiency of the induced fan and reducing the noise of the induced fan.

[0033] Preferably, in this embodiment, the fan impeller 6 adopts a high-efficiency centrifugal fan impeller 6 with a large flow coefficient, a high specific speed and a low pressure coefficient, which 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.

[0034] Preferably, in this embodiment, a nozzle device 12 is installed at the air outlet, and the valve device is installed at the nozzle device 12 .

[0035] In this embodiment, the nozzle device 12 preferably adopts an electric double-layer adjustable guide vane structure, and is provided with an inner guide vane electric air valve device 13 and an outer guide vane electric air valve device 14. The inner guide vane electric air valve device 13 can be electrically adjusted in the vertical direction, and the adjustment angle is 45-135 degrees; the outer guide vane electric air valve device 14 can be adjusted in the horizontal direction, and the adjustment angle is 0-90 degrees. The inner guide vane electric air valve device 13 can be electrically adjusted in the vertical direction, and the adjustment angle is 45-135 degrees, so that the air volume is induced to a wider area; the outer guide vane electric air valve device 14 can be adjusted in the horizontal direction, and the adjustment angle is 0-90 degrees, so that the air volume is induced to near the ground; this design can achieve the best combination of fan range, coverage area, and induced air volume.

[0036] The opening angles of the inner guide vane electric air valve device 13 and the outer guide vane electric air valve device 14 can be adjusted steplessly, so that a suitable control mode can be selected according to specific working conditions; the air valve device can also be set to perform automatic swing parameterized control within a certain angle according to the working conditions. For example, the outer guide vane electric air valve device 14 can be set to perform linear automatic air sweep swing at a parameter of 30°±15°.

[0037] Preferably, in this embodiment, the fan casing 1 is of a flat and long structure.

[0038] Preferably, in this embodiment, a disinfection device 11 is provided inside the fan housing 1. The disinfection device 11 can be provided by means of an ultraviolet lamp or the like, and can automatically disinfect the gas when the fan is running, thereby effectively preventing the occurrence and spread of germs.

[0039] 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 centrifugal induced fan capable of back-blowing and automatic dust removal, characterized in that: It includes a fan housing, wherein both ends of the fan housing are respectively provided with an air inlet and an air outlet, a filter, a side air inlet channel, a blowing device, and a volute are sequentially installed along the air inlet toward the air outlet, a back-blowing reserved air outlet is provided at the bottom of the fan housing, a fan flow channel switching device is provided between the side air inlet channel and the back-blowing reserved air outlet, and a valve device capable of adjusting the opening and closing of the air outlet is provided at the air outlet; The side air inlet channel includes an upper air inlet and a lower air inlet, and the fan flow channel switching device includes a sliding baffle plate 1 matched with the upper air inlet / lower air inlet and a sliding baffle plate 2 matched with the back-blowing reserved air outlet, and the sliding baffle plate 1 and the sliding baffle plate 2 are connected by a connecting rod; The fan flow channel switching device adopts a centralized control method, and controls the movement of the sliding baffle plate 1 and the sliding baffle plate 2 through an electric actuator; A nozzle device is installed at the air outlet, and the valve device is installed at the nozzle device; The nozzle device adopts an electric double-layer adjustable guide vane structure, and is provided with an inner guide vane electric air valve device and an outer guide vane electric air valve device. The inner guide vane electric air valve device can be electrically adjusted in the vertical direction, and the adjustment angle is 45-135 degrees. The outer guide vane electric air valve device can be adjusted in the horizontal direction, and the adjustment angle is 0-90 degrees.

2. The high-efficiency centrifugal induced blower capable of back-blowing and automatic dust removal according to claim 1 is characterized in that: The blowing device comprises a fan impeller and a motor installed in the fan housing, and the motor adopts an EC integrated high-efficiency variable frequency motor.

3. The high-efficiency centrifugal induced blower capable of back-blowing and automatic dust removal according to claim 2 is characterized in that: A collector is installed in the fan housing. The collector is arc-shaped and is formed by spin forming with a mold. The surface of the collector is smooth and streamlined.

4. The high-efficiency centrifugal induced blower capable of back-blowing and automatic dust removal according to claim 2 is characterized in that: The fan impeller adopts a high-efficiency centrifugal fan impeller with a large flow coefficient, a high specific speed and a low pressure coefficient.

5. The high-efficiency centrifugal induced blower capable of back-blowing and automatic dust removal according to claim 1 is characterized in that: The fan casing is in a flat and long structure.

6. The high-efficiency centrifugal induced blower capable of back-blowing and automatic dust removal according to claim 1 is characterized in that: A disinfection device is arranged inside the fan housing.

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