A low-noise type voltage transformation device

Abstract

The present invention discloses a low-noise type voltage transformer device, which includes a centrifugal fan. The centrifugal fan includes a housing and an impeller. The housing includes a lower bottom plate (1), side plates (2), and an upper cover plate (3). The impeller includes a hub (4) and fan blades (5). A first air inlet (6) is provided on the upper cover plate, and a second air inlet (7) is provided on the lower bottom plate. A plurality of support ribs (8) are provided in the second air inlet, and the inner circumference of the support ribs is connected to the motor base (9). It is characterized in that: a plurality of diversion grooves (11) are provided on the upper surface of the lower bottom plate (1), and the plurality of diversion grooves are evenly distributed in the circumferential direction and are arranged adjacent to the fan blades on this upper surface. By providing a plurality of diversion grooves on the upper surface of the lower bottom plate and evenly distributing the plurality of diversion grooves in the circumferential direction, the present invention can effectively reduce the inlet noise of the second air inlet, thereby reducing the noise level of the centrifugal fan and reducing the noise of the voltage transformer device.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of electrical or electronic voltage transformation devices, and particularly to a low-noise voltage transformation device. Background Art

[0002] Heat dissipation fans (axial fans, centrifugal fans) are widely used for heat dissipation of various electrical / electronic voltage transformation devices. The heat dissipation fans of voltage transformation devices have been fully developed towards large air volume and low noise. However, the existing centrifugal fans still have the problem of relatively large noise. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a low-noise voltage transformation device. By arranging a plurality of diversion grooves on the upper surface of the lower bottom plate of the heat dissipation fan, and the plurality of diversion grooves are evenly distributed circumferentially, the inlet noise of the second air inlet can be effectively reduced, thereby reducing the noise level of the centrifugal fan. By arranging a plurality of grooves on the horizontal part, the plurality of grooves are adjacent to and corresponding to the diversion grooves, and the plurality of grooves cooperate with the diversion grooves, the backflow can be inhibited, thereby further reducing the noise level of the centrifugal fan and reducing the noise of the voltage transformation device.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A low-noise voltage transformation device includes a centrifugal fan. The centrifugal fan includes a housing and an impeller. The impeller is installed in the housing. The housing includes a lower bottom plate (1), side plates (2), and an upper cover plate (3). The circumferentially extending side plates are arranged between the lower bottom plate and the upper cover plate. The impeller includes a hub (4) and fan blades (5). A plurality of fan blades are evenly distributed circumferentially on the outer periphery of the hub. A first air inlet (6) is arranged on the upper cover plate, a second air inlet (7) is arranged on the lower bottom plate, a plurality of support ribs (8) are arranged in the second air inlet, the inner circumference of the support ribs is connected to the motor base (9), a drive motor is arranged on the motor base and inside the hub, and an air outlet (10) is arranged on one side of the housing. It is characterized in that: a plurality of diversion grooves (11) are arranged on the upper surface of the lower bottom plate (1), the plurality of diversion grooves are evenly distributed circumferentially, and the upper surface is arranged adjacent to the fan blades.

[0006] Furthermore, the fan blade (5) includes a horizontal part (51) and an inclined part (52). The radially outer end of the inclined part is connected to the horizontal part, and the radially inner end of the inclined part is connected to the outer periphery of the hub (4); the diversion groove (11) extends radially, and the inner diameter of the diversion groove is equal to the outer diameter of the second air inlet (7), and the outer diameter of the diversion groove (11) is equal to the outer diameter of the horizontal part (51).

[0007] Further, a plurality of grooves (5) are provided on the horizontal portion (51), the plurality of grooves are linearly arranged along the horizontal portion, and the plurality of grooves are adjacent to and correspondingly arranged with the diversion channels (11).

[0008] Further, there is a gap g between the horizontal portion (51) and the upper surface of the lower bottom plate (1), the diversion channels (11) and the grooves (53) have a depth H, g > H, and g = (1.2 - 1.9)H.

[0009] Further, a baffle plate (54) is provided at one end of the inclined portion (52), the baffle plate is perpendicular to the side surface of the inclined portion, and the height by which the baffle plate (54) protrudes from the side surface is 1 - 3 times the depth H.

[0010] Further, the support rib (8) is tangent to the outer periphery of the motor base (9), and the diversion channel (11) closest to the support rib (8) is substantially parallel to the support rib, and the number of diversion channels is 2 - 8 times the number of support ribs.

[0011] A low-noise type voltage transformation device of the present invention can effectively reduce the inlet noise of the second air inlet and thus reduce the noise level of the centrifugal fan by providing a plurality of diversion channels on the upper surface of the lower bottom plate of the centrifugal fan, and the plurality of diversion channels are evenly distributed in the circumferential direction. By providing a plurality of grooves on the horizontal portion, the plurality of grooves are adjacent to and correspondingly arranged with the diversion channels, and the plurality of grooves cooperate with the diversion channels to suppress the backflow, thereby further reducing the noise level of the centrifugal fan and reducing the noise of the voltage transformation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a front view structural schematic diagram of the centrifugal fan of the low-noise type voltage transformation device of the present invention;

[0013] Figure 2 is a top view structural schematic diagram of the centrifugal fan of the low-noise type voltage transformation device of the present invention.

[0014] In the figure: lower bottom plate 1, side plate 2, upper cover plate 3, hub 4, fan blade 5, first air inlet 6, second air inlet 7, support rib 8, motor base 9, air outlet 10, diversion channel 11, horizontal portion 51, inclined portion 52, groove 53, baffle plate 54. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] As Figure 1-2 shown, a low-noise type voltage transformation device includes a centrifugal fan. The centrifugal fan includes a housing and an impeller. The impeller is installed inside the housing. The housing includes a lower bottom plate 1, side plates 2, and an upper cover plate 3. The circumferentially extending side plates 2 are disposed between the lower bottom plate 1 and the upper cover plate 3. The impeller includes a hub 4 and blades 5. A plurality of blades 5 are evenly distributed circumferentially on the outer periphery of the hub 4. A first air inlet 6 is provided on the upper cover plate 3, and a second air inlet 7 is provided on the lower bottom plate 1. A plurality of support ribs 8 are provided inside the second air inlet 7. The inner periphery of the support ribs 8 is connected to the motor base 9. A drive motor is provided on the motor base 9 and inside the hub 4. An air outlet 10 is provided on one side of the housing. It is characterized in that: a plurality of flow guide grooves 11 are provided on the upper surface of the lower bottom plate 1. The plurality of flow guide grooves 11 are evenly distributed circumferentially and are disposed adjacent to the blades 5 on this upper surface.

[0018] Further, the blade 5 includes a horizontal portion 51 and an inclined portion 52. The radially outer end of the inclined portion 52 is connected to the horizontal portion 51, and the radially inner end of the inclined portion 52 is connected to the outer periphery of the hub 4. The flow guide groove 11 extends radially, and the inner diameter of the flow guide groove 11 is equal to the outer diameter of the second air inlet 7, and the outer diameter of the flow guide groove 11 is equal to the outer diameter of the horizontal portion 51.

[0019] For the low-noise type voltage transformation device of the present invention, by providing a plurality of flow guide grooves 11 on the upper surface of the lower bottom plate 1 of the centrifugal fan, and the plurality of flow guide grooves 11 are evenly distributed circumferentially, the inlet noise of the second air inlet 7 can be effectively reduced, thereby reducing the noise level of the centrifugal fan and reducing the noise of the voltage transformation device.

[0020] Further, a plurality of grooves 5 are provided on the horizontal portion 51. The plurality of grooves 5 are linearly arranged along the horizontal portion 51. The plurality of grooves 5 are adjacent to and correspondingly arranged with the flow guide grooves 11. By providing a plurality of grooves 5 on the horizontal portion 51, the plurality of grooves 5 are adjacent to and correspondingly arranged with the flow guide grooves 11, and the plurality of grooves 5 cooperate with the flow guide grooves 11, the backflow can be suppressed, thereby further reducing the noise level of the centrifugal fan and reducing the noise of the voltage transformation device.

[0021] Further, there is a gap g between the horizontal portion 51 and the upper surface of the lower bottom plate 1. The flow guide groove 11 and the groove 53 have a depth H, and g > H, specifically g = (1.3 - 1.7)H, preferably g = 1.5H.

[0022] Further, a baffle 54 is provided at one end of the inclined portion 52. The baffle 54 is perpendicular to the side surface of the inclined portion 52, and the height by which the baffle 54 protrudes from this side surface is 1-3 times the depth H. The setting of the baffle 54 can play a role in guiding the flow and achieve the effect of assisting in noise reduction.

[0023] Further, the support rib 8 is tangent to the outer periphery of the motor base 9, and the flow guide groove 11 closest to the support rib 8 is arranged substantially parallel to the support rib 8 (including the coincidence and parallelism of the center lines), and the number of the flow guide grooves 11 is 3-6 times the number of the support ribs 8.

[0024] In a low-noise type voltage conversion device of the present invention, a plurality of flow guide grooves 11 are provided on the upper surface of the lower bottom plate 1 by means of a centrifugal fan. The plurality of flow guide grooves 11 are evenly distributed in the circumferential direction, and can effectively reduce the inlet noise of the second air inlet 7, thereby reducing the noise level of the centrifugal fan. By providing a plurality of grooves 5 on the horizontal portion 51, the plurality of grooves 5 are adjacent to and correspond to the flow guide grooves 11, and the plurality of grooves 5 cooperate with the flow guide grooves 11 to suppress the backflow, thereby further reducing the noise level of the centrifugal fan and reducing the noise of the voltage conversion device.

[0025] The above embodiments are illustrative of the present invention and not restrictive thereof. It can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise type voltage transformation device, which includes a centrifugal fan. The centrifugal fan includes a housing and an impeller. The impeller is installed inside the housing. The housing includes a lower bottom plate (1), side plates (2), and an upper cover plate (3). The circumferentially extending side plates are arranged between the lower bottom plate and the upper cover plate. The impeller includes a hub (4) and fan blades (5). A plurality of fan blades are evenly distributed circumferentially on the outer periphery of the hub. A first air inlet (6) is provided on the upper cover plate, and a second air inlet (7) is provided on the lower bottom plate. A plurality of support ribs (8) are provided inside the second air inlet. The inner circumference of the support ribs is connected to the motor base (9). A drive motor is provided on the motor base and inside the hub. An air outlet (10) is provided on one side of the housing; It is characterized in that: The upper surface of the lower bottom plate (1) is provided with a plurality of flow guiding grooves (11). The plurality of flow guiding grooves are evenly distributed circumferentially and are arranged adjacent to the fan blades on this upper surface; The fan blade (5) includes a horizontal portion (51) and an inclined portion (52). The radially outer end of the inclined portion is connected to the horizontal portion, and the radially inner end of the inclined portion is connected to the outer periphery of the hub; The flow guiding groove (11) extends radially, and the inner diameter of the flow guiding groove is equal to the outer diameter of the second air inlet (7), and the outer diameter of the flow guiding groove is equal to the outer diameter of the horizontal portion (51); A plurality of grooves (53) are provided on the horizontal portion. The plurality of grooves are linearly arranged along the horizontal portion. The plurality of grooves are adjacent to and correspond to the flow guiding groove (11).

2. The low-noise type voltage conversion device according to claim 1, wherein There is a gap g between the horizontal portion (51) and the upper surface of the lower bottom plate (1). The flow guiding groove (11) and the groove (53) have a depth H, g > H, and g = (1.2 - 1.9)H.

3. The low-noise type voltage conversion device according to claim 2, characterized in that, One end of the inclined portion (52) is provided with a baffle plate (54). The baffle plate is perpendicular to the side surface of the inclined portion. The height by which the baffle plate (54) protrudes from this side surface is 1 - 3 times the depth H.

4. A low-noise type voltage conversion device according to claim 2 or 3, characterized in that, The support rib (8) is tangent to the outer periphery of the motor base (9), and the flow guiding groove (11) closest to the support rib (8) is arranged substantially parallel to the support rib, and the number of flow guiding grooves is 2 - 8 times the number of support ribs.

Images