Volute type centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a volute type centrifugal fan which comprises a machine frame and a fan body, the fan body is installed on the machine frame, an inlet clock is installed on the front side of the fan body, an air door mechanism is installed on the front side of the inlet clock, and the air door mechanism comprises an installation ring and a worm and gear box. A main air door plate, a left air door plate, a right air door plate and a plurality of auxiliary air door plates are rotatably mounted in the mounting ring, connecting seats are mounted on the outer sides of the main air door plate, the left air door plate, the right air door plate and the auxiliary air door plates, and the connecting seats are jointly connected with connecting rods; air inlet filter screens are mounted on the rear sides of the main air door plate, the left air door plate, the right air door plate and the auxiliary air door plates; the fan is provided with the air door mechanism capable of adjusting the air inlet amount, the air door mechanism can be closed when the fan is in cold start, the motor load is reduced, and motor overload burning loss caused by overlarge motor starting current is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, and specifically relates to a volute centrifugal fan. Background Technique

[0002] In the production and manufacturing processes of various industries, it is necessary to use fans to achieve functions such as ventilation and air change, cooling and temperature reduction, gas transportation, and smoke exhaust and dust removal. Fans can be divided into centrifugal fans, axial fans, mixed-flow (oblique-flow) fans, and cross-flow fans according to the gas flow direction. Among them, centrifugal fans are widely used due to their high efficiency, low noise, energy conservation and environmental protection, safety and reliability, and diverse selection. The working principle of a centrifugal fan is to inhale external gas into the center of a rotating impeller. When the gas leaves the impeller blades, the flow rate increases, and the kinetic energy is converted into static pressure energy. Subsequently, the gas is sent into a pipeline or a container.

[0003] For example, the patent document CN216131108U discloses a volute centrifugal fan, which includes a volute, an air inlet cover, an impeller, and a power assembly; the cover plate is provided with a fixed knife cutter head, and the fixed knife cutter head includes a blade fixing ring and a plurality of blades. The plurality of blades are evenly distributed, and the two ends are respectively connected to the cover plate and the blade fixing ring. The blade cutting edge is inclined outward. The impeller, the output shaft, the blade fixing ring, and the air inlet pipe are coaxial; the blade fixing ring is sleeved on the impeller shaft with a gap. The impeller disc is provided with a plurality of long blades on the other side corresponding to the cover plate. The plurality of long blades are evenly distributed around the impeller shaft and are spirally unfolded along the outside of the impeller shaft. One end of the plurality of long blades close to the impeller shaft is provided with an inclined edge corresponding to the blade cutting edge of the fixed knife cutter head. The blade cutting edge and the inclined edge of the long blade form a gap shear cut; however, there are still many deficiencies in this prior art. For example, there is no damper mechanism to adjust the air intake volume. When the fan starts cold, the damper cannot be closed, which may cause the fan to be overloaded during cold start and the motor current to be too large, resulting in motor damage. Content of the Utility Model

[0004] The purpose of the utility model is to provide a volute centrifugal fan to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present utility model provides the following technical solution: A volute centrifugal fan, comprising a frame and a fan body, the fan body is installed on the frame, an inlet bell is installed on the front side of the fan body, and a damper mechanism is installed on the front side of the inlet bell. The damper mechanism includes a mounting ring and a worm and worm gear box. A main air damper plate, a left air damper plate, a right air damper plate and a plurality of auxiliary air damper plates are rotatably installed in the mounting ring. Connecting seats are installed on the outer sides of the main air damper plate, the left air damper plate, the right air damper plate and the plurality of auxiliary air damper plates. A connecting rod is commonly connected to the plurality of connecting seats. Rotating shafts are fixedly connected to the upper and lower ends of the main air damper plate, the left air damper plate, the right air damper plate and the plurality of auxiliary air damper plates. The rotating shaft at the upper end of the main air damper plate penetrates through the mounting ring and is connected to the output end of the worm and worm gear box. The input end of the worm and worm gear box is connected to a damper motor. An air inlet filter screen is installed on the rear sides of the main air damper plate, the left air damper plate, the right air damper plate and the plurality of auxiliary air damper plates.

[0006] As a further improvement to the above solution, main sealing grooves are provided at the front ends on the right sides of the main air damper plate, the left air damper plate and the plurality of auxiliary air damper plates, and auxiliary sealing grooves are provided at the rear ends on the left sides of the main air damper plate, the right air damper plate and the plurality of auxiliary air damper plates. The main sealing grooves and the auxiliary sealing grooves are cooperatively sealed.

[0007] As a further improvement to the above solution, mounting grooves are provided on the right sides of the main air damper plate, the left air damper plate and the plurality of auxiliary air damper plates. A U-shaped mounting bracket is slidably installed in the mounting grooves. A cleaning roller is rotatably installed in the U-shaped opening of the U-shaped mounting bracket. The left side of the U-shaped mounting bracket is fixedly connected to the left inner wall of the mounting groove by a plurality of springs.

[0008] As a further improvement to the above solution, an impeller assembly is provided inside the fan body. The impeller assembly includes an annular conical front disc, blades and a rear disc. The rear end of the inlet bell is sleeved inside the annular conical front disc, and a plurality of the blades are fixedly installed between the annular conical front disc and the rear disc.

[0009] As a further improvement to the above solution, a transmission shaft is provided at the rear side of the annular conical front disc. The transmission shaft penetrates through the rear side of the fan body and is connected to a driven pulley. A plurality of shaft brackets are sleeved outside the transmission shaft, and all the plurality of shaft brackets are installed on the frame.

[0010] As a further improvement to the above solution, a fan motor is provided at the lower end of the rear side of the frame. The output end of the fan motor is fixedly connected to a driving pulley. A transmission belt is commonly sleeved outside the driving pulley and the driven pulley.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] 1. The utility model installs a damper mechanism on the front side of the inlet bell. The damper mechanism includes an installation ring and a worm and worm gear box. A main damper plate, a left damper plate, a right damper plate and several auxiliary damper plates are rotatably installed in the installation ring. Connecting seats are installed on the outer sides of the main damper plate, the left damper plate, the right damper plate and several auxiliary damper plates. Several connecting seats are jointly connected with a connecting rod. The upper and lower ends of the main damper plate, the left damper plate, the right damper plate and several auxiliary damper plates are fixedly connected with rotating shafts. Main sealing grooves are provided at the front ends on the right sides of the main damper plate, the left damper plate and several auxiliary damper plates, and auxiliary sealing grooves are provided at the rear ends on the left sides of the main damper plate, the right damper plate and several auxiliary damper plates. The main sealing grooves and the auxiliary sealing grooves cooperate for sealing. The damper mechanism can control the magnitude of the air intake volume. When the fan starts up cold, closing the damper can effectively reduce the load during the motor startup, preventing the motor from being burned out due to overcurrent. The main sealing grooves and the auxiliary sealing grooves with cooperation for sealing can ensure the sealing effect.

[0013] 2. The utility model opens installation grooves on the right sides of the main damper plate, the left damper plate and several auxiliary damper plates. A U-shaped installation frame is slidably installed in the installation grooves. A cleaning roller is rotatably installed in the U-shaped opening of the U-shaped installation frame. The left side of the U-shaped installation frame is fixedly connected with the left inner wall of the installation groove by several springs. The cleaning roller can swing back and forth with the damper plate to clean the air inlet filter screen. Further, the springs press the cleaning roller on the surface of the air inlet filter screen through the U-shaped installation frame, so that there is always pressure between the cleaning roller and the air inlet filter screen, ensuring the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a three-dimensional structure schematic diagram of the first perspective of the present utility model;

[0016] Figure 2 It is a three-dimensional structure schematic diagram of the second perspective of the present utility model;

[0017] Figure 3 It is a structure schematic diagram of the combination of the inlet bell and the impeller assembly of the present utility model;

[0018] Figure 4 It is a structure schematic diagram of the first perspective of the damper mechanism of the present utility model;

[0019] Figure 5 It is a structure schematic diagram of the second perspective of the damper mechanism of the present utility model;

[0020] Figure 6Schematic structural diagram of the air damper mechanism for opening the air damper in the present utility model;

[0021] Figure 7 Exploded structural diagram of the air damper plate in the present utility model;

[0022] Figure 8 Cross-sectional view of the air damper plate cleaning the air inlet filter in the present utility model.

[0023] In the figure: 1, frame; 2, fan body; 3, inlet bell; 4, air damper mechanism; 401, mounting ring; 402, worm and worm gear box; 403, main air damper plate; 404, left air damper plate; 405, right air damper plate; 406, auxiliary air damper plate; 407, connecting seat; 408, connecting rod; 409, rotating shaft; 410, air damper motor; 411, air inlet filter; 412, main sealing groove; 413, auxiliary sealing groove; 414, mounting groove; 415, U-shaped mounting bracket; 416, cleaning roller; 5, impeller assembly; 501, annular conical front disc; 502, blade; 503, rear disc; 6, transmission shaft; 601, driven pulley; 602, shaft bracket; 7, fan motor; 701, driving pulley. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0025] A volute centrifugal fan, as Figure 1 and Figure 4 shown, includes a frame 1 and a fan body 2. The fan body 2 is installed on the frame 1. An inlet bell 3 is installed on the front side of the fan body 2. The inlet bell 3 is located at the air inlet of the fan, used to guide air to smoothly enter the fan interior, reduce air flow loss, improve the efficiency of the fan, and at the same time reduce noise. An air damper mechanism 4 is installed on the front side of the inlet bell 3. The air damper mechanism 4 can control the size of the air intake volume. Especially when the fan is cold-started, closing the air damper can effectively reduce the load during motor startup and prevent the motor from being burned out due to overcurrent. The air damper mechanism 4 includes a mounting ring 401 and a worm and worm gear box 402. A main air damper plate 403, a left air damper plate 404, a right air damper plate 405, and several auxiliary air damper plates 406 are rotatably installed in the mounting ring 401.

[0026] As Figures 4 to 7As shown, connection seats 407 are installed on the outer sides of the main air door panel 403, left air door panel 404, right air door panel 405, and several auxiliary air door panels 406. A connecting rod 408 is commonly connected to several connection seats 407. Rotating shafts 409 are fixedly connected to the upper and lower ends of the main air door panel 403, left air door panel 404, right air door panel 405, and several auxiliary air door panels 406. The number of air door panels is generally odd. The rotating shaft 409 on the main air door panel 403 is connected to the output end of the worm and worm gear box 402. The air door panels are linked through the connection seats 407 and the connecting rod 408. The rotation of the main air door panel 403 drives the rotation of other air door panels.

[0027] As Figure 1 , Figure 5 and Figure 7 shown, a main sealing groove 412 is provided at the front end on the right side of the main air door panel 403, left air door panel 404, and several auxiliary air door panels 406. A secondary sealing groove 413 is provided at the rear end on the left side of the main air door panel 403, right air door panel 405, and several auxiliary air door panels 406. When the air door mechanism 4 is closed, the main sealing groove 412 cooperates with the secondary sealing groove 413 for sealing to prevent air from entering the fan body 2 and bringing a load to the motor during cold start. The rotating shaft 409 at the upper end of the main air door panel 403 passes through the mounting ring 401 and is connected to the output end of the worm and worm gear box 402. The input end of the worm and worm gear box 402 is connected to an air door motor 410. The input end of the worm and worm gear box 402 is a worm shaft. The worm meshes with the worm gear. The worm gear shaft is the output end of the worm and worm gear box 402. The air door motor 410 drives the worm to rotate, the worm drives the worm gear to rotate, and the worm gear shaft drives the main air door panel 403 to rotate, making the opening and closing of the air door smoother. An air inlet filter screen 411 is installed at the rear side of the main air door panel 403, left air door panel 404, right air door panel 405, and several auxiliary air door panels 406. The air inlet filter screen 411 filters the air entering the fan to reduce the dust entering the fan and prevent the increase of motor power consumption caused by the accumulation of dust on the impeller.

[0028] As Figures 1 to 3 shown, an impeller assembly 5 is provided inside the fan body 2. The impeller assembly 5 includes an annular conical front disc 501, blades 502, and a rear disc 503. The rear end of the inlet bell 3 is sleeved inside the annular conical front disc 501. The inlet bell 3 smoothly guides the air into the fan, reducing the airflow loss caused by directly sucking air through the air inlet and improving the efficiency of the fan. Several blades 502 are fixedly installed between the annular conical front disc 501 and the rear disc 503. A transmission shaft 6 is provided at the rear side of the annular conical front disc 501. The transmission shaft 6 passes through the rear side of the fan body 2 and is connected to a driven pulley 601. Several shaft brackets 602 are sleeved outside the transmission shaft 6. Several shaft brackets 602 are all installed on the frame 1. A fan motor 7 is provided at the lower end of the rear side of the frame 1. The output end of the fan motor 7 is fixedly connected to a driving pulley 701. A transmission belt is commonly sleeved outside the driving pulley 701 and the driven pulley 601.

[0029] When the first embodiment works, start the damper motor 410, control the right side of the main damper plate 403 to rotate outward through the worm and worm gear box 402. The main damper plate 403 drives the right damper plate 405 and several auxiliary damper plates 406 to rotate through the connecting seat 407 and the connecting rod 408 until the main sealing groove 412 and the auxiliary sealing groove 413 are cooperatively sealed. Then turn off the damper motor 410 and start the fan motor 7. The fan motor 7 drives the impeller to rotate through the driving pulley 701, the transmission belt, the driven pulley 601 and the transmission shaft. After the fan is stably started, start the damper motor 410 again to control the opening of the damper, so that air enters the interior of the fan to be pressurized and output from the air outlet. Embodiment 2

[0030] On the basis of the first embodiment, as Figures 5 to 8 shown, the right sides of the main damper plate 403, the left damper plate 404 and several auxiliary damper plates 406 are provided with mounting grooves 414. A U-shaped mounting frame 415 is slidably mounted in the mounting groove 414. A cleaning roller 416 is rotatably mounted in the U-shaped opening of the U-shaped mounting frame 415. As the damper plate rotates, the cleaning roller 416 sweeps on the surface of the air inlet filter screen 411 to clean the dust on the air inlet filter screen 411. The left side of the U-shaped mounting frame 415 is fixedly connected to the left inner wall of the mounting groove 414 by several springs. The springs can ensure that there is pressure between the cleaning roller 416 and the air inlet filter screen 411 as the damper plate rotates, ensuring the cleaning strength.

[0031] When the second embodiment works, without shutting down the fan, start the damper motor 410 to make the damper plate swing reciprocally within a certain range. The spring pushes the U-shaped mounting frame 415 to press the cleaning roller 416 against the air inlet filter screen 411, so that there is always pressure between the cleaning roller 416 and the air inlet filter screen 411. The reciprocally swinging damper plate makes the cleaning roller 416 sweep back and forth on the air inlet filter screen 411, sweeping away the accumulated dust on the air inlet filter screen 411, ensuring smooth air intake, and avoiding the reduction of air intake caused by dust blockage, which affects the air outlet effect.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A volute type centrifugal fan, comprising a frame (1) and a fan body (2), characterized in that: The fan body (2) is mounted on the frame (1); an inlet bell (3) is mounted on the front side of the fan body (2); a damper mechanism (4) is mounted on the front side of the inlet bell (3); the damper mechanism (4) comprises a mounting ring (401) and a worm gear box (402); a main damper plate (403), a left damper plate (404), a right damper plate (405) and a plurality of auxiliary damper plates (406) are rotatably mounted in the mounting ring (401); connecting seats (407) are mounted on the outer sides of the main damper plate (403), the left damper plate (404), the right damper plate (405) and the plurality of auxiliary damper plates (406); and the plurality of connecting seats (407) are mounted on the outer sides of the main damper plate (403), the left damper plate (404), the right damper plate (405) and the plurality of auxiliary damper plates (406). 07) are commonly connected with a connecting rod (408); the upper and lower ends of the main air damper plate (403), the left air damper plate (404), the right air damper plate (405) and the plurality of auxiliary air damper plates (406) are fixedly connected with a rotating shaft (409); the upper end rotating shaft (409) of the main air damper plate (403) passes through the mounting ring (401) and is connected with the output end of the worm gear box (402); the input end of the worm gear box (402) is connected with a damper motor (410); and the rear sides of the main air damper plate (403), the left air damper plate (404), the right air damper plate (405) and the plurality of auxiliary air damper plates (406) are installed with an air inlet filter (411).

2. A volute type centrifugal fan according to claim 1, characterized in that: A main sealing groove (412) is provided at the front end of the right side of the main air damper plate (403), the left air damper plate (404) and a plurality of the auxiliary air damper plates (406); a secondary sealing groove (413) is provided at the rear end of the left side of the main air damper plate (403), the right air damper plate (405) and a plurality of the auxiliary air damper plates (406); the main sealing groove (412) cooperates with the secondary sealing groove (413) for sealing.

3. A volute type centrifugal fan according to claim 1, characterized in that: The right sides of the main air damper plate (403), the left air damper plate (404) and the plurality of auxiliary air damper plates (406) are provided with mounting grooves (414), a U-shaped mounting frame (415) is slidably mounted in the mounting grooves (414), a cleaning roller (416) is rotatably mounted in the U-shaped opening of the U-shaped mounting frame (415), and the left side of the U-shaped mounting frame (415) is fixedly connected to the left inner wall of the mounting grooves (414) by means of a plurality of springs.

4. A volute type centrifugal fan according to claim 1, characterized in that: An impeller assembly (5) is provided in the fan body (2), and the impeller assembly (5) comprises an annular conical front disc (501), blades (502) and a rear disc (503); a rear end of the inlet bell (3) is sleeved in the annular conical front disc (501), and a plurality of blades (502) are fixedly mounted between the annular conical front disc (501) and the rear disc (503).

5. A volute type centrifugal fan according to claim 4, characterized in that: A transmission shaft (6) is provided on the rear side of the annular conical front disc (501), the transmission shaft (6) passes through the rear side of the fan body (2) and is connected to a driven pulley (601), and a plurality of shaft supports (602) are provided on the outer sleeve of the transmission shaft (6), and the plurality of shaft supports (602) are all mounted on the frame (1).

6. A volute type centrifugal fan according to claim 5, characterized in that: A fan motor (7) is provided at the lower rear end of the frame (1); a driving pulley (701) is fixedly connected to the output end of the fan motor (7); and a transmission belt is provided on the outside of the driving pulley (701) and the driven pulley (601).

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