Novel double-suction fan impeller

Abstract

A novel double-suction fan impeller comprises two impeller covers which are oppositely arranged front and back and a circular middle disc arranged between the two impeller covers, and a plurality of blades perpendicular to the middle disc are arranged on the periphery of the middle disc. Each blade comprises a body plate, and one side of each body plate is provided with an insertion opening and connected with the middle disc in an inserted mode through the insertion opening. A concave plate is arranged on the side, away from the center of the center plate, of the body plate, one side of the concave plate is connected with the body plate, and the middle of the other side of the concave plate is concave inwards in the direction close to the center of the center plate. Side plates are further arranged on the two opposite sides of the body plate, one sides of the two side plates are connected with the body plate, and the ends, close to the circle center of the middle disc, of the other sides of the two side plates protrude outwards. The blades are integrally machined and formed, manufacturing time is saved, and cost is reduced; the special structure of the blade can slow down fluid impact and reduce impact noise; the blades and the middle disc can be clamped mutually, the protrusions and the notches which are matched with each other are arranged between the blades and the impeller cover, the blades, the middle disc and the impeller cover can be limited before welding, and the welding effect of the impeller is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan impeller technical field, concretely is a novel double suction fan impeller. BACKGROUND

[0002] The centrifugal double suction fan adopts double support structure, has high operation reliability, supplies large wind volume and the like advantages, is widely used in cement, tunnel, power station, industrial boiler and the like industries, wherein the impeller is an important component influencing the performance of the double suction fan. The patent document with the application number CN202220376113.1 discloses a kind of integral blade welding double suction type off-line fan impeller, under the premise of not changing original impeller overall structure design, using integral blade first inserts and locates and then welds fixed, realizes automatic positioning in assembly process, reduces welding process cost, improves production efficiency, blade is inserted and connected with middle disc first through spigot before welding, but its spigot can only play the positioning role before welding to blade, cannot have limiting effect, blade is prone to misplacement in welding process, affects welding effect, and there is no limiting structure when front disc and blade are welded, front disc also has misplacement risk when welding, in addition, its blade is trapezoidal structure, and edge is all straight segment, airflow in the flow effect in impeller is poor, and noise is big. CONTENT OF UTILITY MODEL

[0003] To solve the technical problems of poor positioning effect between blade and middle disc, front disc, affect welding effect, blade shape is not conducive to airflow flow and reduce noise in the above background art, the utility model provides a kind of novel double suction fan impeller.

[0004] The utility model technical scheme is as follows:

[0005] A kind of novel double suction fan impeller, including two wheel covers that are oppositely arranged, and circular middle disc is arranged between the two, the middle disc circle is equipped with several vertical blades;The blade includes body plate, one side of which is provided with an insertion port and is connected to the middle disc by the insertion port;The side of the body plate away from the center of the middle disc is provided with a concave plate, one side of the concave plate is connected to the body plate, and the other side is recessed towards the center of the middle disc;The opposite sides of the body plate are also provided with side plates, one side of the two side plates is connected to the body plate, and the other side is outwardly protruding at one end close to the center of the middle disc.

[0006] Blade realizes the quick positioning of the position relationship between the middle disc through the insertion port, facilitates the welding of the blade and the middle disc subsequently, and the blades on the two sides of the middle disc are designed as a whole, to improve the production efficiency. The concave design of the concave plate at the blade air outlet is different from the straight edge structure of the blade air outlet side in the prior art, which can reduce the instability of the fluid from the outlet of the impeller, reduce the energy impact at the outlet, and is conducive to the convergence of the fluid from the two sides of the middle disc to the outlet.

[0007] Specifically, the body plate includes two first side edges arranged oppositely, the two first side edges are connected with two side plates respectively; the body plate further includes a top edge connected with a concave plate; the body plate further includes two bottom edges arranged oppositely on two sides of the insertion port, and one end of the two bottom edges close to the insertion port is inclined towards the center of the disc. The top edge and the first side edge of the body plate are connected with the concave plate and one side of the side plate respectively, which ensures the smooth transition of each part of the blade, and the bottom edge of the body plate is inclined, that is, the edge of the blade at the inlet of the impeller is inclined, which reduces the fluid impact at the inlet of the impeller, reduces the impact noise, and improves the flow guiding efficiency of the impeller.

[0008] Further, the body plate, the concave plate and the side plate are integrally processed and formed, which saves manufacturing time and reduces labor and equipment costs.

[0009] As a preferred embodiment, the thickness of the blade away from the center of the disc is smaller than the thickness of the blade close to the center of the disc. The thickness of the blade gradually decreases from the inlet side of the impeller to the outlet side, which can reduce the vortex of adjacent blades at the outlet, improve the flow guiding efficiency.

[0010] In order to further reduce the noise generated during the operation of the impeller, a plurality of perforations are arranged symmetrically on the body plate with respect to the plane of the disc. The perforation design of the blade can improve the negative pressure performance and noise reduction performance of the impeller, and the number and arrangement of the perforations are arranged symmetrically with respect to the plane of the disc to ensure that the noise reduction performance and pressure on both sides of the disc are consistent.

[0011] In order to facilitate the connection of the cover and the blade, the side of the two covers close to the disc is provided with a notch, and the outer side of the side plate is provided with a protrusion which is clamped and fixed in the notch. Before welding the cover and the blade, the position of the cover is limited by the clamping and fitting of the protrusion and the notch, so that the displacement of the cover during welding is prevented, and the welding effect is affected.

[0012] As for the specific structure of the disc, a plurality of notches are arranged circumferentially on the edge of the disc, and a strip-shaped positioning stopper is arranged on one side of the notch, which can be inserted and fitted with the insertion port of the blade. Through the cooperation of the insertion port and the positioning stopper, the blade and the edge of the disc are cross-inserted, and the blade and the disc can be clamped after insertion, which enhances the limiting effect before welding.

[0013] Further preferably, the side of the two covers away from the disc is further provided with a reinforcing ring to enhance the overall strength of the impeller.

[0014] Through the above design, the beneficial effects of the novel double-suction fan impeller are as follows:

[0015] (1) The blade is integrally processed and formed, which saves manufacturing time and reduces labor and equipment costs.

[0016] (2), through the cooperation of the insertion interface and the positioning stop, cross insertion of the blade and the edge of the middle disc is realized, the blade and the middle disc can be clamped after insertion, and the limiting effect before welding is realized, so that the blade and the middle disc are prevented from being dislocated. Moreover, the blade and the wheel cover are provided with the protrusion and the notch matched with each other, the wheel cover is prevented from being dislocated during welding of the wheel cover, and the welding effect of the impeller is ensured.

[0017] (3), the special structure of the blade is provided, that is, the edges of the blades at the air inlet and the air outlet of the impeller are inclined, so that the fluid impact is slowed down, the impact noise is reduced, and the flow guiding efficiency of the impeller is improved. Meanwhile, the blade is provided with perforations, so that the noise during operation of the impeller is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In the drawings:

[0019] Figure 1 It is a schematic view of a novel double-suction fan impeller of the utility model;

[0020] Figure 2 It is a front view of the blade in the embodiment;

[0021] Figure 3 It is a schematic view of the middle disc in the embodiment;

[0022] Figure 4 It is a schematic view of the wheel cover in the embodiment;

[0023] Figure 5 It is a sectional view of a novel double-suction fan impeller of the utility model;

[0024] Figure 6 It is Figure 5 An enlarged view of A in the middle;

[0025] The components represented by the reference numerals in the drawings are:

[0026] 1, wheel cover; 11, first cover plate; 12, second cover plate; 2, middle disc; 21, positioning stop; 3, blade; 31, body plate; 32, insertion interface; 33, concave plate; 34, edge plate; 4, protrusion; 5, reinforcing ring. DETAILED DESCRIPTION

[0027] The exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings.

[0028] EMBODIMENT

[0029] In combination Figures 1 to 6 , the embodiment improves a novel double-suction fan impeller, which comprises two wheel covers 1 arranged opposite to each other, and a circular middle disc 2 arranged between the two wheel covers, and the middle disc 2 is provided with a plurality of blades 3 perpendicular thereto.

[0030] As a preferred embodiment, the thickness of the blade 3 away from the center of the disc 2 is smaller than the thickness of the blade 3 close to the center of the disc 2. The thickness of the blade 3 gradually decreases from the inlet side to the outlet side, which can reduce the vortex of the adjacent blade 3 at the outlet side and improve the flow guiding efficiency.

[0031] In this embodiment, the blade 3 includes a body plate 31, which is provided with a plug-in port 32 and is connected to the disc 2 through the plug-in port 32. The blade 3 is quickly positioned with the disc 2 through the plug-in port 32, which facilitates the subsequent welding of the blade 3 and the disc 2, and the blade 3 on both sides of the disc 2 is designed as a whole, which improves the manufacturing efficiency. Figure 2 In specific implementation, the length of the plug-in port 32 is not greater than 1 / 2 of the length of the blade 3 along the plug-in port 32, and is not less than 1 / 3. The plug-in range between the blade 3 and the disc 2 is improved, and the strength of the blade 3 as a whole is ensured.

[0032] In this embodiment, the side of the body plate 31 away from the center of the disc 2 is provided with a concave plate 33, one side of the concave plate 33 is connected to the body plate 31, and the other side is concave towards the center of the disc 2. The opposite sides of the body plate 31 are also provided with side plates 34, one side of the two side plates 34 is connected to the body plate 31, and the other side close to the center of the disc 2 is outwardly protruding. The concave design of the concave plate 33 at the outlet side of the blade 3 is different from the straight edge structure of the blade 3 in the prior art, which can slow down the instability of the fluid at the outlet side of the impeller, reduce the energy impact at the outlet side, and is conducive to the convergence of the fluid from both sides of the disc 2 to the outlet side.

[0033] Specifically, the body plate 31 includes two first side edges arranged oppositely, and the two first side edges are respectively connected to the two side plates 34. The body plate 31 also includes a top edge connected to the concave plate 33, and two bottom edges arranged oppositely on both sides of the plug-in port 32, and the end of the two bottom edges close to the plug-in port 32 is inclined towards the center of the disc 2. The top edge and the first side edge of the body plate 31 are respectively coincidently connected to one side of the concave plate 33 and the side plate 34, which ensures the smooth transition of the connection between the parts of the blade 3, and the bottom edge of the body plate 31 is inclined, i.e. the edge of the blade 3 at the inlet side of the impeller is inclined, which reduces the fluid impact at the inlet side of the impeller, reduces the impact noise, and improves the flow guiding efficiency of the impeller.

[0034] Further, the body plate 31, the concave plate 33 and the side plate 34 are integrally processed and formed, which saves the manufacturing time and reduces the labor and equipment costs.

[0035]

[0036] ​The special structure of the body plate 31, the concave plate 33 and the edge plate 34 can reduce the wear of the blades 3 by the fluid at the middle disc 2, the fan is more wear-resistant, and the service life is longer.

[0037] To further reduce the noise generated during the operation of the impeller, a plurality of perforations are symmetrically arranged on the body plate 31 relative to the plane of the middle disc 2, the perforation design of the blades 3 can improve the negative pressure performance and noise reduction performance of the impeller, and the number and arrangement of the perforations are symmetrically arranged relative to the plane of the middle disc 2, so as to ensure that the noise reduction performance and pressure receiving conditions on both sides of the middle disc 2 are consistent.

[0038] In combination with Figure 3 As for the specific structure of the middle disc 2, a plurality of V-shaped notches are circumferentially arranged at the edge of the middle disc 2, the notches include a first edge line parallel to the blades 3 and a second edge line parallel to the radius of the middle disc 2, and the intersection of the first edge line and the second edge line is transitioned by a circular arc. By arranging the notches at the edge of the middle disc 2, the weight of the impeller is reduced, the bearing load is reduced, the service life of the bearing is prolonged, the fan can be more safely and stably operated, the total weight is reduced, the moment of inertia of the fan is reduced, the motor can be more easily started, and the fan can consume less energy.

[0039] A strip-shaped positioning stop 21 capable of being inserted and matched with the insertion port 32 of the blade 3 is arranged at one side of the notch, i.e. the first edge line. Through the matching of the insertion port 32 and the positioning stop 21, the cross insertion of the blade 3 and the edge of the middle disc 2 is realized, and the blade 3 and the middle disc 2 after insertion can be clamped to each other, so as to enhance the limiting effect before welding. The length of the positioning stop 21 is 1 / 2 of the length of the insertion port 32, so as to ensure that there is enough clamping range between the blade 3 and the middle disc 2 after insertion, and the clamping effect is improved.

[0040] In combination with Figure 4 In order to facilitate the connection of the wheel cover 1 and the blade 3, the curvatures of the two wheel covers 1 and the blade 3 on opposite sides are matched with each other, so as to ensure that there is sufficient welding area between the blade 3 and the wheel cover 1, and one side of the two wheel covers 1 close to the middle disc 2 is provided with a recess; the outer side of the edge plate 34 is provided with a protrusion 4 which is clamped and fixed in the recess. Before welding the wheel cover 1 and the blade 3, the position of the wheel cover 1 is first limited through the clamping and matching of the protrusion 4 and the recess, so as to prevent the wheel cover 1 from being displaced during the welding process and affect the welding effect.

[0041] In combination with Figure 6 The wheel cover 1 is processed in sections and includes a first cover plate 11 in a flat shape and a second cover plate 12 in a bent shape, the first cover plate 11 and the second cover plate 12 are matched with one side of the edge plate 34 away from the body plate 31 after being welded and connected, and the recess is arranged on the first cover plate 11. Since the second cover plate 12 is arranged in a bent shape, the thickness of the second cover plate 12 is set to be slightly larger than the thickness of the first cover plate 11, so as to enhance the strength of the wheel cover 1.

[0042] Combination Figure 5 Further preferably, the two wheel covers 1 away from the side of the middle disc 2 is also provided with reinforcing ring 5, enhance the overall strength of the impeller.

[0043] Through the above design, the blade 3 is integrally formed, saves manufacturing time, reduces labor and equipment cost. Through the cooperation of the plug-in interface 32 and the positioning stop 21, the cross plug-in of the blade 3 and the edge of the middle disc 2 is realized, the blade 3 and the middle disc 2 can be clamped after plugging, play a limiting role before welding, avoid the blade 3 and the middle disc 2 occur misplacement. Moreover, the blade 3 and the wheel cover 1 are provided with the protrusion 4 and the recess which cooperate with each other, can prevent the wheel cover 1 from misplacement when welding the wheel cover 1, ensure the welding effect of the impeller. The special structure of the blade 3, that is, the edge of the blade 3 at the inlet and outlet of the impeller is inclined, can slow down the fluid impact, reduce the impact noise, improve the flow efficiency of the impeller. At the same time, the blade 3 is provided with perforation, which can further reduce the noise during the operation of the impeller.

Claims

1. A novel double-suction fan impeller, characterized in that, It includes two wheel covers (1) arranged opposite each other, and a circular central plate (2) between the two, with a number of blades (3) perpendicular to it around the central plate (2). The blade (3) includes a body plate (31), which has an insertion interface (32) on one side and is connected to the central plate (2) through the insertion interface (32); The main body plate (31) has a concave plate (33) on the side away from the center of the middle plate (2). One side of the concave plate (33) is connected to the main body plate (31), and the middle part of the other side is concave inward toward the center of the middle plate (2). The main body plate (31) is also provided with side plates (34) on both sides. One side of the two side plates (34) is connected to the main body plate (31), and the other side protrudes outward from the end near the center of the middle plate (2).

2. The novel double-suction fan impeller according to claim 1, characterized in that, The main body plate (31) includes two first side edges arranged opposite to each other, and the two first side edges are respectively connected to the two side plates (34); It also includes a top edge, which is connected to a concave plate (33); It also includes two bottom edges located on both sides of the plug-in interface (32), with the ends of the two bottom edges near the plug-in interface (32) inclined toward the center of the central plate (2).

3. The novel double-suction fan impeller according to claim 1, characterized in that, The main body plate (31), concave plate (33) and side plate (34) are integrally formed.

4. The novel double-suction fan impeller according to claim 1, characterized in that, The thickness of the blade (3) on the side away from the center of the disk (2) is less than the thickness on the side closer to the center of the disk (2).

5. The novel double-suction fan impeller according to claim 1, characterized in that, The main body plate (31) is provided with several perforations symmetrically relative to the plane where the middle plate (2) is located.

6. The novel double-suction fan impeller according to claim 1, characterized in that, The two wheel covers (1) have a notch on the side near the center plate (2); The outer side of the side plate (34) is provided with a protrusion (4) that is snapped into the notch.

7. The novel double-suction fan impeller according to claim 1, characterized in that, The middle plate (2) has several notches around its edge, and a strip-shaped positioning stop (21) is provided on one side of the notch, which can be inserted and matched with the insertion interface (32) of the blade (3).

8. The novel double-suction fan impeller according to claim 1, characterized in that, The two wheel covers (1) are also provided with a reinforcing ring (5) on the side opposite to the center plate (2).

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