Noise reduction fan current collector

Abstract

The utility model discloses a noise reduction fan current collector, which relates to the technical field of centrifugal fans, and comprises a volute, an impeller is arranged in the volute, an air inlet is arranged on the volute, a current collector is arranged in the air inlet, and the impeller, the air inlet and the current collector are coaxially arranged. The flow collector comprises a mounting seat and a hollow flow guide cylinder arranged on the mounting seat; an annular flow guide groove is formed in the outer wall of the flow guide cylinder, an annular step groove is formed in the inner wall of the flow guide cylinder, a noise reduction layer is arranged in an interlayer of the flow guide cylinder, and honeycomb holes are formed in the noise reduction layer; the flow guide grooves can disturb airflow entering the flow collector, a laminar fluid layer attached to the surface of the flow collector is damaged and changed into turbulent flow, the purpose of flow separation in advance is achieved, large vortexes are avoided, meanwhile, the noise reduction layer is arranged in the interlayer of the flow guide cylinder, honeycomb holes are formed in the noise reduction layer and can reduce the penetrating power of noise, and the noise reduction effect is improved. Aerodynamic noise can be reduced, and the tone of air inlet noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a noise-reducing fan collector. Background Art

[0002] A centrifugal fan is a machine that relies on the work of an impeller to convert electrical energy into mechanical energy, increase gas pressure and discharge gas. It is a driven fluid machine and is widely used in daily production and life. A centrifugal fan is usually composed of a motor, an impeller, a volute, a collector and other components. The collector is usually installed in the air inlet area of ​​the impeller to guide the external airflow into the fan. In order to ensure the good flow guiding effect of the collector and prevent the impeller from interfering with the collector during operation, a certain gap is maintained between the top of the impeller blade and the collector.

[0003] At present, high-speed centrifugal fans, especially high-pressure centrifugal fans, usually design the gap between the collector and the impeller to be very small (such as 2mm or even smaller), so as to reduce the pressure loss at the air inlet and improve the fan efficiency;

[0004] However, at this time, the air inlet velocity is very high, and aerodynamic noise will be generated when the airflow enters the impeller from the collector. In addition, laminar separation will occur at the tail end of the collector in the air inlet area, which will also generate noise, which is not conducive to the requirements of environmental protection and noise reduction.

[0005] Meanwhile, the current collector of the existing fan is connected to the volute of the fan by screws when in use, so that the workers need to remove the screws one by one during the installation and removal of the current collector, which makes the installation and removal time-consuming. Utility Model Content

[0006] The utility model aims to provide a noise-reducing fan collector, which has the function of noise reduction and is easy to disassemble and assemble.

[0007] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a noise-reducing fan collector, comprising a volute, an impeller is arranged in the volute, an air inlet is arranged on the volute, a collector is arranged in the air inlet, the impeller, the air inlet and the collector are coaxially arranged, the collector comprises a mounting seat, a hollow guide cylinder arranged on the mounting seat; a ring-shaped guide groove is arranged on the outer wall of the guide cylinder, a ring-shaped step groove is arranged on the inner wall of the guide cylinder, the inner diameter of the step groove increases successively along the direction of the air inlet, a noise reduction layer is arranged inside the interlayer of the guide cylinder, and honeycomb holes are arranged in the noise reduction layer.

[0008] In order to distribute and disassemble the collector, as a preferred noise reduction fan collector of the utility model, the volute is provided with mounting grooves distributed in an annular array, the inner wall of the air inlet is provided with a through hole connected to the mounting groove, a spring is provided on the side of the mounting groove away from the through hole, an L-shaped clamping block is provided at one end of the spring, the clamping block can slide in the mounting groove and the through hole, a clamping groove is provided on the outer wall of the mounting seat, one end of the clamping block is clamped in the clamping groove.

[0009] In order to limit the collector, as a noise reduction fan collector of the utility model, preferably, a screw is provided in the block, a butterfly handle is provided at one end of the screw outside the mounting groove, and a threaded hole matched with the other end of the screw is opened in the mounting groove.

[0010] In order to increase the stability of the mounting seat at the air inlet, as a preferred noise reduction fan collector of the utility model, a sealing ring is provided on the inner wall of the air inlet and is in contact with the outer wall of the mounting seat.

[0011] In order to achieve a filtering effect, as a preferred noise reduction fan collector of the utility model, a filter screen cover is arranged on the mounting seat.

[0012] In order to facilitate the disassembly and replacement of the filter screen cover, as a preferred noise reduction fan collector of the utility model, an annular groove is provided on the side of the mounting seat away from the guide tube, and the filter screen cover is arranged in the annular groove by bolts.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. The utility model provides a guide groove on the outer wall of the guide tube, which can disturb the airflow entering the collector, destroy the laminar fluid layer attached to the surface of the collector, and turn it into turbulence, so as to achieve the purpose of flow separation in advance and avoid the generation of large vortices. At the same time, a noise reduction layer is arranged inside the interlayer of the guide tube, and honeycomb holes are arranged inside the noise reduction layer. The honeycomb holes can reduce the penetration of noise, reduce aerodynamic noise, and reduce the tone of intake noise. A step groove is arranged on the inner wall of the guide tube, and the inner diameter of the step groove increases successively along the direction of the air inlet. The air outlet end of the guide tube is larger than the air inlet end, so that the incoming wind has a buffer space, and the wind that is easy to flow flows quickly, with small flow resistance, and the air intake volume is increased.

[0015] 2. The utility model opens a mounting groove on the volute, arranges a spring and a block in the mounting groove, and opens a matching slot at one end of the block. When disassembling and installing the collector, the block moves as a whole into the mounting groove. After the collector is sleeved on the air inlet, the block is snapped into the slot under the elastic force of the spring, so that the collector can be quickly disassembled and assembled, and the disassembly and assembly is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the middle current collector structure;

[0018] Figure 3 It is a structural schematic diagram of the clamping block in the utility model.

[0019] In the figure: 1. volute; 2. impeller; 3. air inlet; 4. collector; 5. mounting seat; 6. guide tube; 7. guide groove; 8. step groove; 9. noise reduction layer; 10. honeycomb hole; 11. mounting groove; 12. through hole; 13. spring; 14. block; 15. groove; 16. screw; 17. threaded hole; 18. sealing ring; 19. filter screen; 20. annular groove. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0021] See also Figures 1 to 3 A noise reduction fan collector comprises a volute 1, an impeller 2 is arranged in the volute 1, an air inlet 3 is arranged on the volute 1, a collector 4 is arranged in the air inlet 3, and the impeller 2, the air inlet 3 and the collector 4 are coaxially arranged. The collector 4 comprises a mounting seat 5, a hollow guide tube 6 arranged on the mounting seat 5; a ring-shaped guide groove 7 is arranged on the outer wall of the guide tube 6, and a ring-shaped step groove 8 is arranged on the inner wall of the guide tube 6, and the inner diameter of the step groove 8 increases successively along the direction of the air inlet 3, and a noise reduction layer 9 is arranged inside the interlayer of the guide tube 6, and a honeycomb hole 10 is arranged in the noise reduction layer 9.

[0022] In this embodiment: the impeller 2 in the volute 1 rotates, and the external wind enters the volute 1 from the air inlet 3 through the collector 4, and finally is discharged from the outlet; by providing the guide groove 7 on the outer wall of the guide tube 6, the guide groove 7 can disturb the airflow entering the collector 4, destroy the laminar fluid layer attached to the surface of the collector 4, and turn it into turbulence, so as to achieve the purpose of early flow separation and avoid the generation of large vortices. At the same time, a noise reduction layer 9 is arranged inside the interlayer of the guide tube 6, and there are honeycomb holes 10 in the noise reduction layer 9, and the honeycomb holes 10 can reduce the penetration of noise, reduce aerodynamic noise, and reduce the tone of intake noise. A step groove 8 is arranged on the inner wall of the guide tube 6, and the inner diameter of the step groove 8 increases successively along the direction of the air inlet 3. The outlet end of the guide tube 6 is larger than the inlet 3 end, so that the incoming wind has a buffer space, the wind that is easy to flow flows quickly, the flow resistance is small, and the air intake volume is increased.

[0023] As a technical optimization scheme of the utility model, the volute 1 is provided with mounting grooves 11 which are arranged in an annular pattern, the inner wall of the air inlet 3 is provided with a through hole 12 which is connected with the mounting groove 11, a spring 13 is provided on the side of the mounting groove 11 away from the through hole 12, an L-shaped clamping block 14 is provided at one end of the spring 13, and the clamping block 14 can slide in the mounting groove 11 and the through hole 12, a clamping groove 15 is provided on the outer wall of the mounting seat 5, and one end of the clamping block 14 is clamped in the clamping groove 15.

[0024] In this embodiment, the clamping block 14 is clamped into the clamping slot 15 under the elastic force of the spring 13, so that the collector 4 can be quickly disassembled and assembled, and the disassembly and assembly is simple and convenient.

[0025] As a technical optimization solution of the utility model, a screw rod 16 is connected to the clamping block 14 , a butterfly handle is provided at one end of the screw rod 16 outside the mounting groove 11 , and a threaded hole 17 matched with the other end of the screw rod 16 is opened in the mounting groove 11 .

[0026] In this embodiment: when disassembling and installing the collector 4, pull the block 14 to move the block 14 as a whole into the installation groove 11, rotate the butterfly handle on the screw 16, and fix one end of the screw 16 into the threaded hole 17. There is no need to restrict the block 14 to prevent the block 14 from moving into the air inlet 3 under the elastic force of the spring 13 and blocking the mounting seat 5 from entering the air inlet 3.

[0027] As a technical optimization solution of the present invention, a sealing ring 18 is provided on the inner wall of the air inlet 3 and is in contact with the outer wall of the mounting seat 5 .

[0028] In this embodiment, by providing the sealing ring 18, the mounting seat 5 and one side of the air inlet 3 are respectively in close contact with the outer side and the inner side of the sealing ring 18, thereby ensuring that the collector 4 is not easy to shake.

[0029] As a technical optimization solution of the present utility model, a filter screen cover 19 is provided on the mounting seat 5 .

[0030] In this embodiment, by providing a filter screen 19 , the incoming wind can be filtered to prevent dust and impurities from accumulating on the impeller 2 .

[0031] As a technical optimization solution of the utility model, an annular groove 20 is provided on a side of the mounting seat 5 away from the guide tube 6, and the filter screen cover 19 is arranged in the annular groove 20 by bolts.

[0032] In this embodiment, the filter screen cover 19 in the annular groove 20 can be disassembled, replaced and cleaned by rotating the bolt.

[0033] Working principle:

[0034] First, a guide groove 7 is provided on the outer wall of the guide tube 6. The guide groove 7 can disturb the airflow entering the collector 4, destroy the laminar fluid layer attached to the surface of the collector 4, and turn it into turbulent flow, so as to achieve the purpose of flow separation in advance and avoid the generation of large vortices. At the same time, a noise reduction layer 9 is provided inside the interlayer of the guide tube 6. The noise reduction layer 9 has honeycomb holes 10. The honeycomb holes 10 can reduce the penetration of noise, reduce aerodynamic noise, and reduce the tone of intake noise. A step groove 8 is provided on the inner wall of the guide tube 6, and the inner diameter of the step groove 8 increases successively along the direction of the air inlet 3. The air outlet end of the guide tube 6 is larger than the air inlet 3 end, so that the incoming wind has a buffer space, and the wind that is easy to flow flows quickly, with small flow resistance, thereby increasing the air intake volume;

[0035] By opening a mounting groove 11 on the volute 1, a spring 13 and a block 14 are arranged in the mounting groove 11, and a matching slot 15 is opened at one end of the block 14. When disassembling and installing the collector 4, the block 14 is moved as a whole into the mounting groove 11. After the collector 4 is sleeved on the air inlet 3, the block 14 is snapped into the slot 15 under the elastic force of the spring 13, and the collector 4 can be quickly disassembled and assembled, which is simple and convenient.

[0036] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0037] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A noise reduction fan collector, comprising a volute (1), an impeller (2) being arranged inside the volute (1), an air inlet (3) being arranged on the volute (1), a collector (4) being arranged inside the air inlet (3), the impeller (2), the air inlet (3) and the collector (4) being arranged coaxially, characterized in that: The collector (4) comprises a mounting seat (5) and a hollow flow guide cylinder (6) arranged on the mounting seat (5); a flow guide groove (7) in the form of a ring is arranged on the outer wall of the flow guide cylinder (6); a step groove (8) in the form of a ring is arranged on the inner wall of the flow guide cylinder (6); the inner diameter of the step groove (8) increases gradually along the direction of the air inlet (3); a noise reduction layer (9) is arranged inside the interlayer of the flow guide cylinder (6); and honeycomb holes (10) are arranged inside the noise reduction layer (9).

2. A noise reduction fan collector according to claim 1, characterized in that: The volute (1) is provided with mounting grooves (11) arranged in an annular pattern; the inner wall of the air inlet (3) is provided with a through hole (12) connected to the mounting groove (11); a spring (13) is provided on a side of the mounting groove (11) away from the through hole (12); one end of the spring (13) is provided with an L-shaped clamping block (14); the clamping block (14) can slide in the mounting groove (11) and the through hole (12); the outer wall of the mounting seat (5) is provided with a clamping groove (15); one end of the clamping block (14) is clamped in the clamping groove (15).

3. A noise reduction fan collector according to claim 2, characterized in that: A screw rod (16) is arranged in the clamping block (14) and connected thereto. A butterfly handle is arranged at one end of the screw rod (16) outside the mounting groove (11). A threaded hole (17) matching with the other end of the screw rod (16) is arranged in the mounting groove (11).

4. The noise reduction fan collector according to claim 1, characterized in that: A sealing ring (18) is provided on the inner wall of the air inlet (3) and is in contact with the outer wall of the mounting seat (5).

5. The noise reduction fan collector according to claim 1, characterized in that: The mounting seat (5) is provided with a filter screen cover (19).

6. A noise reduction fan collector according to claim 5, characterized in that: An annular groove (20) is provided on a side of the mounting seat (5) away from the guide tube (6), and the filter screen cover (19) is arranged in the annular groove (20) by means of bolts.

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