Fan flow channel structure

Abstract

The fan flow channel structure comprises an upper volute, a lower volute, an impeller and a flow guide structure, an inner cavity is defined by the upper volute and the lower volute, an inlet of the inner cavity is provided with a tangential air inlet, the side face of the lower volute is provided with an axial air outlet, the flow guide structure comprises a convex part and a flow guide channel, and the convex part is arranged on the inner side of the upper volute. The impeller is axially fixed to the inner cavity through the rotating shaft, one end of the impeller faces the axial air outlet, the other side of the impeller faces the protruding part, the protruding part is provided with a rotating shaft connecting area and a flow channel area, one end of the rotating shaft penetrates through the rotating shaft connecting area, and a plurality of Y-shaped flow guide channels are formed in the flow channel area and evenly distributed in the circumferential direction in the air inlet direction. In this way, backflow and leakage generated between the impeller and the flow guide ring are reduced through the convex part, the flow guide effect of airflow is improved, the Y-shaped flow guide channel is matched with the upper volute and the convex part, gas at the air outlet position of the impeller is prevented from leaking to the air inlet position of the impeller, energy loss is reduced, and noise reduction, electricity charge saving and energy consumption reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fan flow channel technical field, in particular to a fan flow channel structure. BACKGROUND

[0002] The sweeper is an automatic cleaning tool, and the fan is one of important components of the sweeper. The fan sucks in air and generates negative pressure, sucks dust and dirt into the machine, and then discharges clean air through the dust filter box. The air duct of the fan of the sweeper is used for guiding air flow in the machine, and the design of the air duct has important value for the fan in terms of noise reduction, performance improvement and energy saving. SUMMARY

[0003] The utility model discloses a fan flow channel structure that is beneficial to energy saving and noise reduction of the fan.

[0004] The utility model discloses a fan flow channel structure that is beneficial to energy saving and noise reduction of the fan.

[0005] A fan flow channel structure, comprising an upper volute, a lower volute, an impeller and a flow guide structure, the upper volute and the lower volute enclose an inner cavity, the inner cavity inlet is provided with a tangential air inlet, the lower volute side is provided with an axial air outlet, the flow guide structure comprises a convex part and a flow channel, the convex part is arranged on the inner side of the upper volute, the impeller is fixed on the inner cavity through a rotating shaft in the axial direction, one end of the impeller faces the axial air outlet, and the other side faces the convex part, the convex part is provided with a rotating shaft connecting area and a flow channel area, one end of the rotating shaft penetrates through the rotating shaft connecting area, a plurality of Y-shaped flow guide channels are arranged on the flow channel area, and the Y-shaped flow guide channels are uniformly arranged in the circumferential direction along the air inlet direction.

[0006] Further, the Y-shaped flow guide channel comprises a first flow guide channel and a second flow guide channel, one end of the first flow guide channel is flush with the edge of the convex part, the other end of the first flow guide channel is combined with the second flow guide channel, one end of the second flow guide channel is flush with the edge of the convex part, and the other end of the second flow guide channel extends to be close to the rotating shaft connecting area.

[0007] Further, the first flow guide channel is arc-shaped, the second flow guide channel comprises a first bending part and a second bending part, the first bending part and the second bending part form a wave shape, and the first flow guide channel is combined at the transition of the first bending part and the second bending part.

[0008] Further, the impeller comprises blades and two hubs, the blades are fixed between the two hubs, the lower hub faces the air outlet, and the upper hub faces the convex part.

[0009] Further, a plurality of arc-shaped through grooves are arranged on the upper hub in the circumferential direction of the upper hub surface.

[0010] Further, the impeller turning direction, the arc-shaped through slot arrangement direction and the Y-shaped flow guide arrangement direction are matched.

[0011] Further, the upper scroll shell and the lower scroll shell bottom edge are respectively provided with recessed flow guide channels.

[0012] Further, the flow guide structure and the upper scroll shell are integrally formed.

[0013] Further, the convex part convex surface is lower than the upper scroll shell shell wall top surface.

[0014] Further, the upper scroll shell bottom part rotates upward along the convex part edge from the air inlet.

[0015] The fan flow channel structure of the utility model, through setting the convex part in the upper scroll shell inside corresponding to the impeller axial direction, setting multiple Y-shaped flow guides on the convex part, the convex part reduces the backflow and leakage between the impeller and the flow guide ring, improves the flow guide effect of the airflow, the Y-shaped flow guide cooperates with the upper scroll shell and the convex part, guides the airflow flowing loss of the flow guide ring to the impeller air inlet along the Y-shaped flow guide, improves the pressure of the impeller air inlet, helps to reduce the gas leakage from the impeller air outlet to the impeller air inlet, reduces the energy loss, thereby effectively reduces the flow loss in the flow channel, reduces the influence of the separated flow, vortex, secondary flow and the like on the fan performance, realizes the noise reduction, saves the electricity fee, reduces the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and should understand that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0017] Fig. 1 It is the three-dimensional schematic diagram of fan;

[0018] Fig. 2 It is the internal structure schematic diagram of upper scroll shell;

[0019] Fig. 3 It is the internal structure schematic diagram of lower scroll shell;

[0020] Fig. 4 It is the structure schematic diagram of impeller. DETAILED DESCRIPTION

[0021] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be apparent that the scope of the present application is not limited to the embodiments set forth herein.

[0022] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the terms "vertical", "horizontal", "left", "right" and the like are merely used for the purpose of illustration and are not intended to limit the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Referring to Figs. 1 to 4 A fan flow channel structure embodiment, the flow channel structure includes upper scroll 1, lower scroll 2, impeller 3 and flow guide structure, upper scroll 1 and lower scroll 2 are enclosed into inner cavity, the inner cavity entrance is provided with tangential air inlet 11, lower scroll 2 is provided with axial air outlet 12, flow guide structure includes convex part 21 and multiple Y-shaped flow guide 22, convex part 21 is arranged in the inner side of upper scroll 1, impeller 3 is axially fixed in the inner cavity through shaft 4, one side of impeller 3 faces axial air outlet 12, the other side faces convex part 21, convex part 21 is provided with shaft connecting area 211 and flow channel area 212, one end of shaft 3 is provided through shaft connecting area 211, Y-shaped flow guide 22 is arranged on flow channel area 212, Y-shaped flow guide 22 is arranged uniformly in the circumferential direction along the air inlet direction.

[0025] The inner cavity entrance is provided with a tangential air inlet 11, the lower volute 2 is provided with an axial air outlet 12, the impeller 3 is axially fixed in the inner cavity through the shaft 4, the inner cavity surrounded by the upper and lower volutes 1 and 2 forms a flow guide ring, the air entering the air inlet 11 is sent to the impeller 3 by the flow guide ring, and the air is discharged from the air outlet 12 under the rotation of the impeller 3. The convex part 21 on the upper volute 1 is mainly designed to reduce the backflow and leakage between the impeller 3 and the flow guide ring, improve the flow guiding effect of the air flow, and the Y-shaped flow guide channel 22 cooperates with the convex part 21 to guide the air flow lost by the flow guide ring to the air inlet of the impeller 3 along the Y-shaped flow guide channel 22, thereby improving the pressure at the air inlet of the impeller 3, reducing the air leakage from the air outlet of the impeller 3 to the air inlet of the impeller 3, and reducing the energy loss.

[0026] In an embodiment of the embodiment, the Y-shaped flow guide channel 22 is designed as a junction of a first flow guide channel 221 and a second flow guide channel, one end of the first flow guide channel 221 is flush with the edge of the convex part 21, the other end is connected with the second flow guide channel, one end of the second flow guide channel is flush with the edge of the convex part 21, and the other end extends to the shaft connection area 211. The first flow guide channel 221 is arc-shaped, the second flow guide channel includes a first bend 222 and a second bend 223, the first bend 222 and the second bend 223 form a wave shape, and the transition of the first flow guide channel 221 to the first bend 222 and the second bend 223 is connected. This design is more suitable for fluid flow, effectively guides the air flow to the air inlet of the impeller 3, reduces the turbulence and vortex in the air flow, reduces noise, and reduces energy loss.

[0027] In an embodiment of the embodiment, the impeller 3 includes blades 31 and two hubs, the blades 31 are fixed between the two hubs, the lower hub 32 faces the axial air outlet 12, and the upper hub 33 faces the convex part 21. The upper hub 33 is provided with a plurality of arc-shaped through grooves 34, the arc-shaped through grooves 34 are arranged along the circumferential direction of the upper hub 33, and the direction of the arc-shaped through grooves 34 matches the direction of the Y-shaped flow guide channel 22. This scheme can further effectively and smoothly guide the air flow to the blades, thereby reducing energy consumption.

[0028] In an embodiment of the embodiment, the upper volute 1 and the lower volute 2 are each provided with a recessed flow guide channel 13, so that the gas can smoothly transition in the flow channel, reduce the direct impact on the volute wall, and reduce the impact loss.

[0029] In an embodiment of the embodiment, the flow guide structure and the upper volute 1 are integrally formed.

[0030] In an embodiment of the embodiment, the convex surface of the convex part 21 is lower than the top surface of the shell wall of the upper volute 1. The lower convex part 21 helps the air flow to be more uniformly distributed in the volute, guides the air flow to pass through the volute more smoothly, reduces the generation of vortex and dead angle, reduces the turbulence and resistance of the air flow, and thereby improves the efficiency of the fan.

[0031] In one embodiment of the embodiment, the upper scroll 1 is rotated upward from the tangential air inlet 11 along the edge of the convex portion, so that the shell mouth of the upper scroll 1 forms a step 14 in the direction of the air inlet and the non-air inlet, so that the direction and speed of the introduced air flow can be adjusted and optimized, the vortex and backflow phenomenon is reduced, thereby improving the efficiency of the fan and reducing the noise of the fan.

[0032] The above-described embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A fan flow passage structure, characterized by comprising: The application relates to a centrifugal fan, which comprises an upper volute, a lower volute, an impeller and a flow guide structure, the upper volute and the lower volute enclosing an inner cavity, the inner cavity being provided with a tangential air inlet, the lower volute being provided with an axial air outlet, the flow guide structure comprising a convex part and a flow guide channel, the convex part being arranged on the inner side of the upper volute, the impeller being fixed on the inner cavity through a rotating shaft in an axial direction, one end of the impeller being directed towards the axial air outlet, the other end being directed towards the convex part, the convex part being provided with a rotating shaft connecting area and a flow channel area, one end of the rotating shaft penetrating through the rotating shaft connecting area, the flow channel area being provided with a plurality of Y-shaped flow guide channels which are arranged uniformly in a circumferential direction along the air inlet direction.

2. The fan flow channel structure of claim 1, wherein The Y-shaped flow guide channel comprises a first flow guide channel and a second flow guide channel, one end of the first flow guide channel being flush with the edge of the convex part, the other end being connected with the second flow guide channel, one end of the second flow guide channel being flush with the edge of the convex part, the other end extending to the vicinity of the rotating shaft connecting area.

3. The fan flow channel structure of claim 2, wherein The first flow guide channel is arc-shaped, the second flow guide channel comprises a first bending part and a second bending part, the first bending part and the second bending part forming a wave shape, and the first flow guide channel is connected with the transition of the first bending part and the second bending part.

4. The fan flow channel structure of claim 1, wherein The impeller comprises blades and two hubs, the blades being fixed between the two hubs, the lower hub being directed towards the axial air outlet, and the upper hub being directed towards the convex part.

5. The fan flow channel structure of claim 4, wherein The upper hub is provided with a plurality of arc-shaped through grooves which are arranged in a circumferential direction along the surface of the upper hub.

6. The fan flow channel structure of claim 5, wherein The rotating direction of the impeller, the arrangement direction of the arc-shaped through grooves and the arrangement direction of the Y-shaped flow guide channels are matched.

7. The fan flow channel structure of claim 1, wherein The upper volute and the lower volute are respectively provided with groove flow guide channels at the bottom edges.

8. The fan flow channel structure of claim 1, wherein The flow guide structure and the upper volute are integrally formed.

9. The fan flow channel structure of claim 1, wherein The convex surface of the convex part is lower than the top surface of the shell wall of the upper volute.

10. The fan flow channel structure of claim 1, wherein The bottom of the upper volute is rotated upwards along the edge of the convex part from the tangential air inlet.

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