Centrifugal fan impeller and centrifugal fan

Abstract

The embodiment of the invention provides a centrifugal fan impeller and a centrifugal fan, and relates to the technical field of pelletizing equipment. The centrifugal fan impeller comprises an impeller body and a wear-resistant composite steel plate, the wear-resistant composite steel plate comprises a base layer and a wear-resistant layer, the base layer is arranged on the surface of the impeller body, and the wear-resistant layer is arranged on the surface of the base layer; wherein the wear-resistant layer comprises 3%-4.5% of carbon, 25%-30% of chromium, 0.5%-1.5% of manganese and 0.5%-1.5% of silicon. By adding carbon, chromium, manganese and silicon elements into the wear-resistant layer of the wear-resistant composite steel plate and controlling the content of the corresponding elements, the elements interact and cooperate, the wear resistance, corrosion resistance and high-temperature oxidation resistance of the wear-resistant layer can be improved, the overall structural stability of the fan impeller is improved, and the service life of the fan impeller is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pelletizing equipment, in particular to a centrifugal fan impeller and a centrifugal fan. BACKGROUND

[0002] The heat-resistant centrifugal fan is an important equipment of the pellet chain kiln finished product system, which mainly functions to pump the hot flue gas in the preheating II section of the chain grate machine to the drying section of the chain grate machine to remove the moisture in the green pellets, so that the green pellets can withstand the temperature above 650 DEG C in the preheating I section. A multi-tube dust collector is installed between the preheating II section and the heat-resistant centrifugal fan to remove the dust particles in the exhaust gas and reduce the dust concentration in the exhaust gas.

[0003] With the increase of the feeding amount of the pellet chain grate machine, the dust concentration in the preheating II section increases, and the dust removal efficiency of the multi-tube dust collector decreases, which significantly increases the dust concentration in the working medium of the centrifugal fan impeller, and further aggravates the wear problem of the rotor blades. Therefore, the existing technology usually provides a wear plate on the impeller. However, the current wear plate still has the problems of insufficient wear resistance, corrosion resistance and high-temperature oxidation resistance, which affects the structural stability and service life of the fan impeller. SUMMARY

[0004] The present application relates to the technical field of pelletizing equipment, in particular to a centrifugal fan impeller and a centrifugal fan.

[0005] The embodiment of the present application is implemented as follows: In a first aspect, the present application provides a centrifugal fan impeller, comprising: an impeller body; and a wear-resistant composite steel plate, the wear-resistant composite steel plate comprising a base layer and a wear-resistant layer, the base layer being arranged on the surface of the impeller body, and the wear-resistant layer being arranged on the surface of the base layer. The carbon content of the wear-resistant layer is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%.

[0006] In an optional embodiment, the impeller body comprises a flange plate, a middle disc, an edge disc and a plurality of blades, the flange plate is used to connect with the main shaft of the centrifugal fan, the middle disc is fixedly sleeved on the outer periphery of the flange plate, and the edge disc is arranged opposite to and coaxially with the middle disc; the plurality of blades are arranged at intervals along the circumference of the middle disc, and the two ends of each blade are connected with the middle disc and the edge disc, respectively. The surface of the middle disc and the plurality of blades is provided with the wear-resistant composite steel plate.

[0007] In an optional embodiment, the base layer is arranged on the windward surface of the blade, and the wear-resistant layer is arranged on the side of the base layer away from the windward surface.

[0008] In an optional embodiment, the wear-resistant composite steel plate is arranged on both sides of the middle disc.

[0009] In an optional embodiment, the number of the edge discs is two, and the two edge discs are arranged on the opposite sides of the middle disc.

[0010] In an optional embodiment, the materials of the middle disc, the edge discs and the plurality of blades are all HG70 steel materials.

[0011] In an optional embodiment, the material of the base layer is Q345 carbon steel.

[0012] In an optional embodiment, the thickness of the base layer is 6-10 mm, and the thickness of the wear-resistant layer is 4-8 mm.

[0013] In an optional embodiment, the wear-resistant composite steel plate is provided with a plurality of plug welding holes, and the plurality of plug welding holes are arranged at intervals. The diameter of the plug welding hole is 13-15 mm, the distance between the plug welding hole close to the edge of the wear-resistant composite steel plate and the edge of the wear-resistant composite steel plate is 70-90 mm, and the distance between two adjacent plug welding holes is 100-150 mm.

[0014] In a second aspect, the present application provides a centrifugal fan, comprising the centrifugal fan impeller of any one of the preceding embodiments.

[0015] The beneficial effects of the embodiments of the present application include: The centrifugal fan impeller comprises an impeller body and a wear-resistant composite steel plate, the wear-resistant composite steel plate comprises a base layer and a wear-resistant layer, the base layer is arranged on the surface of the impeller body, and the wear-resistant layer is arranged on the surface of the base layer; wherein the carbon content of the wear-resistant layer is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%. By adding carbon, chromium, manganese and silicon elements in the wear-resistant layer of the wear-resistant composite steel plate and controlling the content of the corresponding elements, the mutual interaction of the elements can improve the wear resistance, corrosion resistance and high-temperature oxidation resistance of the wear-resistant layer, thereby improving the overall structural stability of the centrifugal fan impeller and prolonging the service life of the centrifugal fan impeller.

[0016] The centrifugal fan comprises the centrifugal fan impeller, which has all the beneficial effects of the centrifugal fan impeller. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The structural schematic diagram of the first perspective of the centrifugal fan impeller provided by the embodiments of the present application is shown in the figure. Figure 2 The structural schematic diagram of the second perspective of the centrifugal fan impeller provided by the embodiments of the present application is shown in the figure. Figure 3 The structural schematic diagram of the wear-resistant composite steel plate provided by the embodiments of the present application is shown in the figure.

[0019] Figure: 100-centrifugal fan impeller; 10-impeller body; 11-flange plate; 12-center plate; 13-edge plate; 14-blade; 141-windward surface; 15-flange; 30-wear-resistant composite steel plate; 31-base layer; 32-wear-resistant layer; 33-soldering hole; 34-clamping groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] As described in the background, with the increase of the feeding amount of the pellet chain grate, the dust content in the exhaust gas in the preheating II section increases, and the dust removal efficiency of the multi-tube dust collector decreases, which causes the dust concentration in the working medium of the centrifugal fan impeller to increase significantly, thereby exacerbating the wear problem of the rotor blades. Therefore, the existing technology usually provides a wear-resistant plate on the impeller. However, the current wear-resistant plate still has the problems of insufficient wear resistance, corrosion resistance and high-temperature oxidation resistance, which affects the structural stability and service life of the fan impeller.

[0027] Based on this, please refer to Figures 1-3 The embodiments of the present application provide a centrifugal fan impeller 100 and a centrifugal fan, which can effectively improve the above-mentioned technical problems, that is, the wear resistance, corrosion resistance and high-temperature oxidation resistance are good, which can improve the overall structural stability of the fan impeller, and prolong the service life of the fan impeller. The centrifugal fan impeller 100 and the centrifugal fan will be described in detail below.

[0028] The embodiment provides a centrifugal fan, which comprises a fan body and a centrifugal fan impeller 100 arranged in the fan body.

[0029] Please refer to Figure 1 and Figure 2 , Figure 1 The first view structural diagram of the centrifugal fan impeller 100 provided by the embodiment is shown in the figure, Figure 2 The second view structural diagram of the centrifugal fan impeller 100 provided by the embodiment is shown in the figure. In combination with Figure 1 and Figure 2 The centrifugal fan impeller 100 comprises an impeller body 10 and a wear-resistant composite steel plate 30 arranged on the surface of the impeller body 10.

[0030] Specifically, please refer to Figure 3 , Figure 3 The structural diagram of the wear-resistant composite steel plate 30 provided by the embodiment is shown in the figure. In combination with Figures 1-3 The wear-resistant composite steel plate 30 comprises a base layer 31 arranged on the surface of the impeller body 10 and a wear-resistant layer 32 arranged on the surface of the base layer 31. The carbon content of the wear-resistant layer 32 is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%.

[0031] It can be understood that, by adding carbon, chromium, manganese and silicon elements in the wear-resistant layer 32 of the wear-resistant composite steel plate 30 and controlling the content of the corresponding elements, the wear-resistant layer 32 can improve the wear resistance, corrosion resistance and high-temperature oxidation resistance of the wear-resistant layer 32, thereby improving the overall structural stability of the centrifugal fan impeller 100 and prolonging the service life of the centrifugal fan impeller 100.

[0032] It should be noted that the main material in the wear-resistant layer 32 is steel, and the remaining material elements are carbon, chromium, manganese and silicon. Specifically, by adding manganese elements and controlling the content, the wear-resistant performance of the wear-resistant layer 32 can be enhanced; meanwhile, the manganese and chromium elements are matched, and the content of the two elements is controlled, so that the high-temperature corrosion resistance of the wear-resistant layer 32 can be enhanced; and further, the silicon elements are added in the material and synergistically act with the carbon, chromium and manganese elements, so that the high-temperature oxidation resistance of the wear-resistant layer 32 can be enhanced.

[0033] According to the above description, the following compares examples with comparative examples to further illustrate the specific effect differences of the wear resistance, corrosion resistance and high-temperature oxidation resistance brought by the different elements and contents of the wear-resistant layer 32. It should be noted that in the following table, S refers to the example, and D refers to the comparative example.

[0034] Firstly, for the index of wear resistance, the wear-resistant composite steel plate 30 can be worn by a wear device for a certain period of time, and the volume loss of the wear-resistant layer 32 is detected. The smaller the loss, the better the wear resistance.

[0035]

[0036] Table 1 As shown in Table 1, the difference between the examples and the comparative examples is that the content of manganese element is different, and the contents of other elements are the same. As can be seen from Table 1, the volume loss of the wear-resistant layer 32 in examples S1-S3 is much smaller than the corresponding volume loss in comparative examples D1-D3. That is, when the content of manganese element is in the range of 0.5-1.5%, the wear-resistant layer 32 formed by the cooperation of manganese, carbon, chromium and silicon elements has better wear resistance.

[0037] Secondly, for the index of corrosion resistance, the wear-resistant composite steel plate 30 can be placed in a corrosion environment, and the time of first rust appearance of the wear-resistant layer 32 is detected. The longer the time of first rust appearance, the better the corrosion resistance.

[0038]

[0039] Table 2 As shown in Table 2, the difference between the examples and the comparative examples is that the contents of manganese and chromium elements are different, and the contents of other elements are the same. As can be seen from Table 2, the time of first rust appearance of the wear-resistant layer 32 in examples S4-S6 is much greater than the corresponding time of first rust appearance in comparative examples D4-D6. That is, when the content of manganese element is in the range of 0.5-1.5% and the content of chromium element is in the range of 25-30%, the wear-resistant layer 32 formed by the cooperation of manganese, carbon and silicon elements has better corrosion resistance.

[0040] Next, for the index of high-temperature oxidation resistance, the wear-resistant composite steel plate 30 can be placed in a high-temperature environment (for example, the temperature can be above 650°C in the first stage of chain grate preheating) for a certain period of time, and the unit area mass change of the wear-resistant layer 32 is detected. The smaller the unit area mass change, the better the high-temperature oxidation resistance.

[0041]

[0042] Table 3 See Table 3, wherein the difference between the examples and the comparative examples is that the content of silicon element is different, and the content of the remaining elements is the same. As can be seen from Table 3, the change amount of the unit area mass of the wear-resistant layer 32 in Examples S7-S9 is far less than the corresponding unit area mass change amount in Comparative Examples D7-D9. That is to say, when the content of silicon element is within the range of 0.5-1.5%, the high-temperature oxidation resistance of the wear-resistant layer 32 formed by the cooperation of silicon element, carbon, chromium and manganese is better.

[0043] It should be noted that when the content of carbon is 3-4.5%, the content of chromium is 25-30%, the content of manganese is 0.5-1.5%, and the content of silicon is 0.5-1.5%, the hardness of the wear-resistant layer 32 formed is 58-65 HRC, which can make the overall structural stability of the impeller better.

[0044] Please continue to combine Figures 1-3 , specifically, the impeller body 10 includes a flange plate 11, a middle plate 12, an edge plate 13 and a plurality of blades 14. The flange plate 11 is used to connect with the main shaft of the centrifugal fan, the middle plate 12 is fixedly sleeved on the outer periphery of the flange plate 11, and the edge plate 13 is arranged opposite and coaxially with the middle plate 12; the plurality of blades 14 are arranged at intervals along the circumferential direction of the middle plate 12, and the two ends of each blade 14 are connected with the middle plate 12 and the edge plate 13 respectively. Among them, the surfaces of the middle plate 12 and the plurality of blades 14 are provided with wear-resistant composite steel plates 30.

[0045] That is to say, the surface of the middle plate 12 is sequentially provided with a base layer 31 and a wear-resistant layer 32, and the surface of the blade 14 is also sequentially provided with a base layer 31 and a wear-resistant layer 32, which can better protect the blade 14 and the middle plate 12, thereby improving the service life of the impeller body 10.

[0046] Combine Figure 3 , in order to facilitate the installation of the blade 14 and the middle plate 12, and further improve the overall structural strength of the impeller body 10, in the embodiment, the wear-resistant composite steel plate 30 on the blade 14 is provided with a clamping groove 34 at one end close to the middle plate 12, and the clamping groove 34 is clamped and matched with the middle plate 12.

[0047] Combine Figure 1 and Figure 2 , in order to facilitate the connection of the flange plate 11 and the main shaft, the impeller body 10 further comprises a flange 15, the flange 15 is arranged on the flange plate 11, and the flange 15 is provided with a mounting hole for butt joint assembly with the main shaft.

[0048] Further, in the embodiment, the base layer 31 is arranged on the windward surface 141 of the blade 14, and the wear-resistant layer 32 is arranged on the side of the base layer 31 away from the windward surface 141. Through such arrangement, the blade 14 can be better protected during rotation, thereby improving its service life and improving the overall structural strength of the impeller body 10.

[0049] Further, in the embodiment, the wear-resistant composite steel plate 30 is arranged on the opposite sides of the middle disc 12, so that the middle disc 12 can be better protected as a whole, thereby improving the overall wear resistance, corrosion resistance and high-temperature oxidation resistance of the impeller body 10.

[0050] It should be noted that the flow channel for airflow circulation is jointly formed between the edge disc 13, the middle disc 12 and the two adjacent blades 14. Optionally, in the embodiment, the number of the edge disc 13 is two, and the two edge discs 13 are arranged on the opposite sides of the middle disc 12.

[0051] That is, the impeller body 10 in the embodiment has a double-inlet structure, and the gas can be sucked from both sides of the impeller body 10 at the same time and then discharged from the outer periphery of the impeller body 10 after converging. Of course, in other embodiments, the number of the edge disc 13 can also be one, that is, the impeller body 10 has a single-inlet structure.

[0052] Optionally, the middle disc 12, the edge disc 13 and the plurality of blades 14 are all made of steel. Specifically, in the embodiment, the middle disc 12, the edge disc 13 and the plurality of blades 14 are all made of HG70 steel, which has the characteristics of high strength, good toughness and good fatigue resistance.

[0053] It should be noted that the base layer 31 is made of carbon steel. Optionally, in the embodiment, the base layer 31 is made of Q345 carbon steel, which has the characteristics of high yield strength and good low-temperature toughness.

[0054] In addition, it should be noted that the connection mode between the middle disc 12, the edge disc 13 and the plurality of blades 14 in the embodiment is welding, and the welding rod used is J707RH high-strength steel welding rod.

[0055] Further, the wear-resistant composite steel plate 30 is installed by plug welding, and the welding wire used in the welding process is VAUTID 100T wear-resistant welding wire, which has good wear resistance below 600°C.

[0056] Please continue to combine Figure 3 The wear-resistant composite steel plate 30 is provided with a plurality of plug welding holes 33, and the plug welding holes 33 are arranged at intervals. Optionally, the diameter of the plug welding hole 33 is 13-15 mm; for example, the diameter can be 13 mm, 13.5 mm, 14 mm, 14.5 mm or 15 mm, etc.

[0057] Optionally, the distance between the plug welding hole 33 close to the edge of the wear-resistant composite steel plate 30 and the edge of the wear-resistant composite steel plate 30 is 70-90 mm; for example, the distance can be 70 mm, 75 mm, 80 mm, 85 mm or 90 mm, etc.

[0058] Optionally, the distance between two adjacent plug welding holes 33 is 100-150 mm; for example, the distance can be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, or 150 mm, etc.

[0059] It should be noted that the wear-resistant composite steel plate 30 is selected from the above parameter range, and the welding effect is better, which can further improve the overall structural stability of the centrifugal fan impeller 100.

[0060] In addition, optionally, in the embodiment, the thickness of the base layer 31 is 6-10 mm; for example, the thickness of the base layer 31 can be 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc. The thickness of the wear-resistant layer 32 is 4-8 mm, for example, the thickness of the wear-resistant layer 32 can be 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm, etc.

[0061] In summary, the embodiment of the present application provides a centrifugal fan impeller 100 and a centrifugal fan. The centrifugal fan impeller 100 includes an impeller body 10 and a wear-resistant composite steel plate 30. The wear-resistant composite steel plate 30 includes a base layer 31 and a wear-resistant layer 32. The base layer 31 is arranged on the surface of the impeller body 10, and the wear-resistant layer 32 is arranged on the surface of the base layer 31. The carbon content of the wear-resistant layer 32 is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%. By adding carbon, chromium, manganese, and silicon elements in the wear-resistant layer 32 of the wear-resistant composite steel plate 30 and controlling the content of the corresponding elements, the interaction between the elements is coordinated, which can improve the wear resistance, corrosion resistance, and high-temperature oxidation resistance of the wear-resistant layer 32, thereby improving the overall structural stability of the centrifugal fan impeller 100 and prolonging the service life of the centrifugal fan impeller 100.

[0062] The centrifugal fan includes the centrifugal fan impeller 100, which has all the functions and advantages of the centrifugal fan impeller 100.

[0063] The above only describes specific embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A centrifugal fan impeller, characterized by, The centrifugal fan impeller (100) comprises a blade body (10) and a wear-resistant composite steel plate (30), the wear-resistant composite steel plate (30) comprises a base layer (31) and a wear-resistant layer (32), the base layer (31) is arranged on the surface of the blade body (10), and the wear-resistant layer (32) is arranged on the surface of the base layer (31). The carbon content of the wear-resistant layer (32) is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%. The blade body (10) comprises a flange plate (11), a middle disc (12), an edge disc (13) and a plurality of blades (14), the flange plate (11) is used for being connected with the main shaft of the centrifugal fan, the middle disc (12) is fixedly sleeved on the outer periphery of the flange plate (11), and the edge disc (13) is arranged in a coaxial manner opposite to the middle disc (12); the plurality of blades (14) are arranged in a spaced manner along the circumference of the middle disc (12), and two ends of each blade (14) are connected with the middle disc (12) and the edge disc (13) respectively. The surface of the middle disc (12) and the plurality of blades (14) is provided with the wear-resistant composite steel plate (30).

2. The centrifugal fan impeller of claim 1, wherein The base layer (31) is arranged on the windward surface (141) of the blade (14), and the wear-resistant layer (32) is arranged on the side of the base layer (31) away from the windward surface (141). The opposite sides of the middle disc (12) are provided with the wear-resistant composite steel plate (30).

3. The centrifugal fan impeller of claim 2, wherein The number of the edge disc (13) is two, and the two edge discs (13) are arranged on the opposite sides of the middle disc (12).

4. The centrifugal fan impeller of claim 2, wherein The materials of the middle disc (12), the edge disc (13) and the plurality of blades (14) are HG70 steel materials.

5. The centrifugal fan impeller of claim 2, wherein The material of the base layer (31) is Q345 carbon steel.

6. The centrifugal fan impeller of claim 2, wherein The thickness of the base layer (31) is 6-10 mm, and the thickness of the wear-resistant layer (32) is 4-8 mm.

7. The centrifugal fan impeller of claim 1, wherein The wear-resistant composite steel plate (30) is provided with a plurality of plug welding holes (33), and the plurality of plug welding holes (33) are arranged in a spaced manner.

8. The centrifugal fan impeller of claim 1, wherein The diameter of the plug welding hole (33) is 13-15 mm; the distance between the plug welding hole (33) close to the edge of the wear-resistant composite steel plate (30) and the edge of the wear-resistant composite steel plate (30) is 70-90 mm; and the distance between two adjacent plug welding holes (33) is 100-150 mm.

9. The centrifugal fan impeller of claim 1, wherein The centrifugal fan impeller (100) comprises a blade body (10) and a wear-resistant composite steel plate (30), the wear-resistant composite steel plate (30) comprises a base layer (31) and a wear-resistant layer (32), the base layer (31) is arranged on the surface of the blade body (10), and the wear-resistant layer (32) is arranged on the surface of the base layer (31). The carbon content of the wear-resistant layer (32) is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%.

10. A centrifugal fan characterized by The blade body (10) comprises a flange plate (11), a middle disc (12), an edge disc (13) and a plurality of blades (14), the flange plate (11) is used for being connected with the main shaft of the centrifugal fan, the middle disc (12) is fixedly sleeved on the outer periphery of the flange plate (11), and the edge disc (13) is arranged in a coaxial manner opposite to the middle disc (12); the plurality of blades (14) are arranged in a spaced manner along the circumference of the middle disc (12), and two ends of each blade (14) are connected with the middle disc (12) and the edge disc (13) respectively. The surface of the middle disc (12) and the plurality of blades (14) is provided with the wear-resistant composite steel plate (30). The base layer (31) is arranged on the windward surface (141) of the blade (14), and the wear-resistant layer (32) is arranged on the side of the base layer (31) away from the windward surface (141). The opposite sides of the middle disc (12) are provided with the wear-resistant composite steel plate (30). The number of the edge disc (13) is two, and the two edge discs (13) are arranged on the opposite sides of the middle disc (12). The materials of the middle disc (12), the edge disc (13) and the plurality of blades (14) are HG70 steel materials. The material of the base layer (31) is Q345 carbon steel. The thickness of the base layer (31) is 6-10 mm, and the thickness of the wear-resistant layer (32) is 4-8 mm. The wear-resistant composite steel plate (30) is provided with a plurality of plug welding holes (33), and the plurality of plug welding holes (33) are arranged in a spaced manner. The diameter of the plug welding hole (33) is 13-15 mm; the distance between the plug welding hole (33) close to the edge of the wear-resistant composite steel plate (30) and the edge of the wear-resistant composite steel plate (30) is 70-90 mm; and the distance between two adjacent plug welding holes (33) is 100-150 mm. The centrifugal fan impeller (100) comprises a blade body (10) and a wear-resistant composite steel plate (30), the wear-resistant composite steel plate (30) comprises a base layer (31) and a wear-resistant layer (32), the base layer (31) is arranged on the surface of the blade body (10), and the wear-resistant layer (32) is arranged on the surface of the base layer (31). The carbon content of the wear-resistant layer (32) is 3-4.5%, the chromium content is 25-30%, the manganese content is 0.5-1.5%, and the silicon content is 0.5-1.5%.

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