A self-filtering low-noise centrifugal fan

Abstract

The present invention discloses a self-filtering low-noise centrifugal fan, which relates to the technical field of centrifugal fans, including a centrifugal casing, an impeller mounted in the centrifugal casing, and a motor for driving the impeller to rotate; the centrifugal casing is provided with an air inlet and an air outlet; the air inlet of the centrifugal casing is provided with a noise reduction filter mechanism; the noise reduction filter mechanism includes an air inlet cylinder, a filter screen and a noise reduction grid plate; the two ends of the air inlet cylinder are respectively an air inlet end and an air outlet end, and the air outlet end of the air inlet cylinder is detachably mounted at the air inlet of the centrifugal casing; the air inlet end of the air inlet cylinder is provided with a filter screen. A plurality of noise reduction cones of the present invention can separate the air inlet end of the air inlet cylinder into a plurality of intervals, and when the outside air passes through the filter screen, it will be "separated" and enter into a plurality of intervals. Since micropores are evenly distributed on the outer wall of the noise reduction cone, the noise generated by the air flow will be reflected and absorbed in the interval to achieve the purpose of reducing noise.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to a self-filtering low-noise centrifugal fan. Background Art

[0002] Centrifugal fans are power fluid machines that use high-speed rotating impellers (centrifugal force) to work on gas media, and convert kinetic energy of gas media into potential energy (pressure energy) by changing the flow direction and flow velocity of gas media. Centrifugal fans are widely used in construction engineering, boilers, chemicals, petroleum and environmental protection industries, and have promising application prospects.

[0003] The motors dedicated to oil drilling platforms require external centrifugal fans. The existing centrifugal fans use "L-shaped air intake bellows, which do not have the function of reducing the fan overflow noise. In addition, the filter screen in the air inlet of the existing centrifugal fan is prone to accumulate a lot of dust during long-term use. If the dust is not removed in time, it is easy to affect the air intake of the centrifugal fan, thereby causing the centrifugal fan to surge. During surge, the flow and pressure of the centrifugal fan change periodically, which will produce greater noise and vibration. Summary of the invention

[0004] The object of the present invention is to provide a self-filtering low-noise centrifugal fan to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] The present invention provides a self-filtering low-noise centrifugal fan, comprising a centrifugal casing, an impeller mounted in the centrifugal casing, and a motor for driving the impeller to rotate; the centrifugal casing is provided with an air inlet and an air outlet;

[0007] The air inlet of the centrifuge housing is provided with a noise reduction filter mechanism; the noise reduction filter mechanism comprises an air inlet cylinder, a filter screen and a noise reduction grid plate;

[0008] The two ends of the air inlet cylinder are respectively an air inlet end and an air outlet end, and the air outlet end of the air inlet cylinder is detachably mounted at the air inlet of the centrifuge housing; a filter screen is mounted on the air inlet end of the air inlet cylinder;

[0009] The noise reduction grid plate is arranged in the air inlet end of the air inlet cylinder, and the noise reduction grid plate includes a plurality of coaxially arranged noise reduction cone cylinders and a reinforcing rib plate for connecting the plurality of noise reduction cone cylinders. The central axis of the noise reduction cone cylinder coincides with the central axis of the air inlet cylinder, and the small mouth end of the noise reduction cone cylinder faces the air outlet end of the air inlet cylinder. In two adjacent noise reduction cone cylinders, the diameter of the small mouth end of the outer noise reduction cone cylinder is smaller than the diameter of the large mouth end of the inner noise reduction cone cylinder, and micropores are evenly distributed on the outer wall of the noise reduction cone cylinder.

[0010] The noise reduction filtering mechanism also includes a dust removal component, which includes a rotating drum arranged at the center of the filter, a wind shield plate and a dust removal plate arranged on the outer peripheral surface of the rotating drum, the wind shield plate is located on the inner side of the filter and abuts against the filter, the dust removal plate is located on the outer side of the filter, and the wind shield plate and the dust removal plate correspond to each other, and a brush abutting against the filter is provided on the side of the dust removal plate close to the filter.

[0011] Furthermore, the diameter of the air inlet tube from the air outlet end to the air inlet end increases continuously to form a conical channel.

[0012] Furthermore, the noise reduction cone located in the innermost layer is the central cone, the small end of the central cone is sealed, the rotating drum is rotatably arranged at the large end of the central cone, a gearbox is fixedly arranged inside the central cone, the input shaft of the gearbox is extended and fixedly connected to the impeller through a connecting shaft, and the output shaft of the gearbox is connected to the rotating drum.

[0013] Furthermore, a dust removal channel connected to the drum is provided in the dust removal plate along its length direction, dust suction holes are evenly provided on one side of the dust removal channel close to the filter, and the dust removal assembly also includes an injection structure for injecting air into the drum.

[0014] Furthermore, the dust suction holes are arranged obliquely from one end of the filter screen to the other end toward the air flow direction of the dust removal channel.

[0015] Furthermore, the air injection structure includes an L-shaped tube, which is connected to the sealed end of the central cone. The L-shaped tube includes a horizontal section coaxial with the connecting shaft, and a vertical section connected to an end of the horizontal section away from the central cone, and an end of the vertical section away from the horizontal section passes through the side wall of the air inlet cylinder. The connecting shaft is located inside the horizontal section, and the connecting shaft in the horizontal section is provided with fan blades, and connecting holes are evenly arranged on one side of the rotating cylinder close to the central cone.

[0016] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0017] 1. The plurality of noise reduction cones of the present invention can separate the air inlet end of the air inlet cylinder into a plurality of sections. When the outside air passes through the filter, it will be "separated" and enter the plurality of sections. Since the outer wall of the noise reduction cone is evenly distributed with micropores, the noise generated by the air flow will be reflected and absorbed in the section to achieve the purpose of reducing noise. Secondly, the conical design of the noise reduction cone (that is, in two adjacent noise reduction cones, the diameter of the small-mouth end of the outer noise reduction cone is smaller than the diameter of the large-mouth end of the inner noise reduction cone) can also effectively reduce and block the internal noise of the centrifugal fan from propagating outward through the inlet end of the air inlet cylinder, thereby achieving the effect of silencing and reducing noise.

[0018] 2. The rotating drum of the present invention can rotate and drive the wind shield plate and the dust removal plate in a circular direction to scrape the dust on the filter screen, wherein the wind shield plate and the dust removal plate can "isolate" a part of the wind shield area in the filtering area of ​​the filter screen, that is, the outside air does not enter the air inlet tube through the wind shield area. On the one hand, it is conducive to the scraping of dust on the filter screen by the brush on the dust removal plate, and on the other hand, it prevents the dust scraped by the brush of the dust removal plate from adhering to the filter screen again due to the flow of air, so as to avoid surging of the centrifugal fan and increased noise.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0023] Figure 3 yes Figure 2 AA structural diagram;

[0024] Figure 4 It is a schematic diagram of the internal structure of the noise reduction and filtering mechanism of the present invention;

[0025] Figure 5 yes Figure 3 Schematic diagram of the local structure at B;

[0026] Figure 6 yes Figure 3 Schematic diagram of the local structure at C;

[0027] Figure 7 It is a simplified schematic diagram of dust removal of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the noise reduction filter mechanism of the present invention without the filter screen;

[0029] Fig. 9 yes Figure 8 Schematic diagram of the local structure at D.

[0030] In the figure:

[0031] 1-centrifuge casing; 11-impeller; 12-motor; 2-noise reduction and filtering mechanism; 21-air inlet; 211-air inlet end; 212-air outlet end; 22-filter; 23-noise reduction grid plate; 231-noise reduction cone; 232-reinforcement ribs; 2311-center cone; 24-dust removal assembly; 241-rotating drum; 242-wind shield; 243-dust removal plate; 2431-dust removal channel; 2432-brush; 2433-dust suction hole; 244-gearbox; 245-connecting shaft; 2461-L-shaped tube; 24611-horizontal section; 24612-vertical section; 2462-fan blades; 2463-connecting hole. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] See also Figure 1-Figure 9 The present invention provides a self-filtering low-noise centrifugal fan, comprising a centrifugal casing 1, an impeller 11 assembled in the centrifugal casing 1, and a motor 12 for driving the impeller 11 to rotate; the centrifugal casing 1 is provided with an air inlet and an air outlet; when working, the motor 12 drives the impeller 11 to rotate so that the outside air enters the centrifugal casing 1 from the air inlet and is discharged from the air outlet. The above working principle is the prior art and will not be elaborated on here.

[0034] In order to reduce the noise of the centrifugal fan during operation, Figure 2 and Figure 3 As shown, the present invention is provided with a noise reduction filter mechanism 2 at the air inlet of the centrifuge housing 1; the noise reduction filter mechanism 2 includes an air inlet cylinder 21, a filter screen 22, and a noise reduction grid plate 23, which are the main components for realizing noise reduction of the present invention.

[0035] Among them, the two ends of the air inlet cylinder 21 are respectively an air inlet end 211 and an air outlet end 212, and the air outlet end 212 of the air inlet cylinder 21 is detachably installed at the air inlet of the centrifuge housing 1; the air inlet end 211 of the air inlet cylinder 21 is installed with a filter screen 22, and when working, the filter screen 22 filters dust in the air to prevent dust from entering the centrifugal fan.

[0036] like Figure 3 , Figure 4 as well as Figure 8As shown, the noise reduction grid plate 23 is arranged in the air inlet end 211 of the air inlet cylinder 21, and the noise reduction grid plate 23 includes a plurality of coaxially arranged noise reduction cones 231 and a reinforcing rib 232 for connecting the plurality of noise reduction cones 231. The central axis of the noise reduction cone 231 coincides with the central axis of the air inlet cylinder 21, and the small end of the noise reduction cone 231 faces the air outlet end 212 of the air inlet cylinder 21. In two adjacent noise reduction cones 231, the diameter of the small end of the outer noise reduction cone 231 is smaller than the diameter of the large end of the inner noise reduction cone 231, and micropores (not shown) are evenly distributed on the outer wall of the noise reduction cone 231.

[0037] A number of noise reduction cones 231 can separate the air inlet end 211 of the air inlet cylinder 21 into a number of intervals. When the outside air passes through the filter 22, it will be "separated" and enter the several intervals. Since the outer wall of the noise reduction cone 231 is evenly distributed with micropores, the noise generated by the air flow will be reflected and absorbed in the interval to achieve the purpose of reducing noise. Secondly, the conical design of the noise reduction cone 231 (that is, in two adjacent noise reduction cones 231, the diameter of the small mouth end of the outer noise reduction cone 231 is smaller than the diameter of the large mouth end of the inner noise reduction cone 231) can also effectively reduce and block the internal noise of the centrifugal fan from propagating outward through the inlet end of the air inlet cylinder 21, thereby achieving the effect of sound elimination and noise reduction.

[0038] In order to avoid excessive impurities adhering to the filter screen 22, which may affect the air intake of the centrifugal housing 1 and cause the centrifugal fan to generate noise. Figure 5 and Fig. 9 As shown, the noise reduction filtering mechanism 2 also includes a dust removal component 24, which includes a rotating drum 241 that passes through the center of the filter 22, a wind shield 242 and a dust removal plate 243 that are arranged on the outer peripheral surface of the rotating drum 241, the wind shield 242 is located on the inner side of the filter 22 and abuts against the filter 22, the dust removal plate 243 is located on the outer side of the filter 22, and the wind shield 242 and the dust removal plate 243 correspond to each other, and a brush 2432 that abuts against the filter 22 is provided on the side of the dust removal plate 243 close to the filter 22.

[0039] When using, combine Figure 8 as well as Fig. 9 As shown, the drum 241 can rotate and drive the wind shield plate 242 and the dust removal plate 243 in a circular direction to scrape off the dust on the filter screen 22, wherein the wind shield plate 242 and the dust removal plate 243 can "isolate" a part of the wind shield area in the filtering area of ​​the filter screen 22, that is, the outside air does not enter the air inlet tube 21 through the wind shield area. On the one hand, it is beneficial for the brush 2432 on the dust removal plate 243 to scrape off the dust on the filter screen 22, and on the other hand, it prevents the dust scraped off by the brush 2432 of the dust removal plate 243 from adhering to the filter screen 22 again due to the flow of air.

[0040] like Figure 3 As shown, in a specific embodiment of the present invention, the diameter of the air inlet tube 21 from the air outlet end 212 to the air inlet end 211 increases continuously to form a conical channel.

[0041] Based on the above design, compared with the straight-cylinder air inlet structure, on the one hand, the filtering area of ​​the filter screen 22 can be increased to improve the air intake volume of the centrifugal fan; on the other hand, it can cooperate with the noise reduction grid plate 23 to make the air flow obliquely toward the air outlet end 212 of the air inlet tube 21.

[0042] like Figure 3 , Figure 6 and Figure 7 As shown, in a specific embodiment of the present invention, the innermost noise reduction cone 231 is a central cone 2311, the small end of the central cone 2311 is sealed, the rotating drum 241 is rotatably arranged at the large end of the central cone 2311, a gearbox 244 is fixedly arranged in the central cone 2311, the input shaft of the gearbox 244 is extended and fixedly connected to the impeller 11 through a connecting shaft 245, and the output shaft of the gearbox 244 is connected to the rotating drum 241. Based on the above design, when the centrifugal fan is working, the input shaft of the gearbox 244 can be synchronously rotated through the connecting shaft 245, at which time, the gearbox 244 can reduce the speed and drive the rotating drum 241 to rotate by its output end to automatically handle dust without an external drive source.

[0043] like Figure 5 , Figure 7 and Fig. 9 As shown, in a specific embodiment of the present invention, the dust removal plate 243 is provided with a dust removal channel 2431 connected to the inside of the drum 241 along its length direction, and a dust suction hole 2433 is provided on the side of the dust removal channel 2431 close to the filter screen 22, and the dust removal assembly 24 also includes an injection structure for injecting gas into the drum 241. Based on the above design, when working, gas is injected into the drum 241 by the injection structure, and the gas will flow at a high speed along the dust removal channel 2431 after entering the inside of the drum 241. During this process, the air pressure in the dust removal channel 2431 decreases, and the dust scraped by the brush 2432 of the dust removal plate 243 will enter the dust removal channel 2431 through the dust suction hole 2433 (Bernoulli principle), and finally from Fig. 9 The dust outlet of the dust removal channel 2431 shown is automatically discharged.

[0044] Furthermore, the dust suction holes 2433 are arranged obliquely from one end of the filter screen 22 to the other end toward the air flow direction of the dust removal channel 2431 .

[0045] like Figure 6As shown, in a specific embodiment of the present invention, the gas injection structure includes an L-shaped tube 2461, the L-shaped tube 2461 is connected to the sealed end of the central cone 2311, the L-shaped tube 2461 includes a horizontal section 24611 coaxial with the connecting shaft 245, and a vertical section 24612 connected to one end of the horizontal section 24611 away from the central cone 2311, combined with Figure 3 As shown, one end of the vertical section 24612 away from the horizontal section 24611 penetrates the side wall of the air inlet cylinder 21, the connecting shaft 245 is located inside the horizontal section 24611, and the connecting shaft 245 in the horizontal section 24611 is provided with fan blades 2462, and the side of the rotating cylinder 241 close to the central cone 2311 is evenly provided with connecting holes 2463. Figure 6 and Figure 7 As shown, Figure 7 The arrow indicates the direction of gas flow. Based on the above design, when working, the connecting shaft 245 can drive the fan blades 2462 to rotate, so that the outside air enters the central cone 2311 through the L-shaped tube 2461, and then enters the rotating drum 241 through the connecting hole 2463. That is, when the centrifugal fan is working, it automatically injects air into the rotating drum 241 for dust removal, without the need for an external air supply source.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-filtering low-noise centrifugal fan, comprising a centrifugal casing, an impeller mounted in the centrifugal casing, and a motor for driving the impeller to rotate; the centrifugal casing is provided with an air inlet and an air outlet; It is characterized in that The air inlet of the centrifuge housing is provided with a noise reduction filter mechanism; the noise reduction filter mechanism comprises an air inlet cylinder, a filter screen and a noise reduction grid plate; The two ends of the air inlet cylinder are respectively an air inlet end and an air outlet end, and the air outlet end of the air inlet cylinder is detachably mounted at the air inlet of the centrifuge housing; a filter screen is mounted on the air inlet end of the air inlet cylinder; The noise reduction grid plate is arranged in the air inlet end of the air inlet cylinder, and the noise reduction grid plate includes a plurality of coaxially arranged noise reduction cone cylinders and a reinforcing rib plate for connecting the plurality of noise reduction cone cylinders. The central axis of the noise reduction cone cylinder coincides with the central axis of the air inlet cylinder, and the small mouth end of the noise reduction cone cylinder faces the air outlet end of the air inlet cylinder. In two adjacent noise reduction cone cylinders, the diameter of the small mouth end of the outer noise reduction cone cylinder is smaller than the diameter of the large mouth end of the inner noise reduction cone cylinder, and micropores are evenly distributed on the outer wall of the noise reduction cone cylinder. The noise reduction filter mechanism also includes a dust removal assembly, which includes a drum penetrating the center of the filter, a windshield and a dust removal plate arranged on the outer peripheral surface of the drum, the windshield is located on the inner side of the filter and contacts the filter, the dust removal plate is located on the outer side of the filter, and the windshield and the dust removal plate correspond to each other, and a brush is arranged on the side of the dust removal plate close to the filter to contact the filter; The innermost noise reduction cone is the central cone, the small end of the central cone is sealed, the rotating drum is rotatably arranged at the large end of the central cone, a gearbox is fixedly arranged in the central cone, the input shaft of the gearbox is extended and fixedly connected to the impeller through a connecting shaft, and the output shaft of the gearbox is connected to the rotating drum; The dust removal plate is provided with a dust removal channel connected to the drum along its length direction, and dust suction holes are evenly arranged on one side of the dust removal channel close to the filter screen, and the dust removal assembly also includes an air injection structure for injecting air into the drum; The dust suction holes are arranged obliquely from one end of the filter screen to the other end toward the air flow direction of the dust removal channel; The air injection structure includes an L-shaped tube, which is connected to the sealed end of the central cone. The L-shaped tube includes a horizontal section coaxial with the connecting shaft, and a vertical section connected to an end of the horizontal section away from the central cone. The end of the vertical section away from the horizontal section passes through the side wall of the air inlet cylinder. The connecting shaft is inside the horizontal section, and the connecting shaft in the horizontal section is provided with fan blades. The side of the rotating cylinder close to the central cone is evenly provided with connecting holes.

2. The self-filtering low-noise centrifugal fan according to claim 1, characterized in that: The diameter of the air inlet tube from the air outlet end to the air inlet end increases continuously to form a conical channel.

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