A wear-resistant impeller for centrifugal fan

Abstract

The present invention discloses a wear-resistant impeller for a centrifugal fan, comprising a middle disk, front disks are respectively arranged on both sides of the middle disk, and blades are arranged between the front disk and the middle disk; a plurality of protrusions are arranged on the end surface where the blade contacts the middle disk, and the plurality of protrusions are spaced and distributed along the edge direction of the end surface where the blade contacts the middle disk, and a plurality of grooves corresponding to the plurality of protrusions are arranged on the middle disk; a wear-resistant composite layer is arranged on the working surface of the blade, one side of the non-working surface of the blade is welded on the middle disk, and the other side of the blade is welded on the front disk. The present invention has good wear resistance and long service life, greatly reduces the overall weight of the impeller, reduces the operating power of the impeller, and has high safety performance.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical ventilation equipment, and in particular to a wear-resistant impeller for a centrifugal fan. Background Art

[0002] Centrifugal fans are based on the principle of converting kinetic energy into potential energy. They use high-speed rotating impellers to accelerate the gas, then slow it down and change the flow direction, thereby converting kinetic energy into potential energy.

[0003] Centrifugal fans are widely used in metallurgy, steel, chemical industry, building materials and other fields. However, due to the harsh operating environment of centrifugal fans, the impellers are easily worn and damaged, which may even lead to safety accidents in serious cases. The most vulnerable parts of the impeller are the air inlet end of the blades, the blades near the center disk at the blade inlet, and the welds between the center disk and the working surface of the blades.

[0004] In order to improve the wear resistance of the blades, two methods are mainly used in the prior art: 1) using wear-resistant welding materials to continuously or intermittently weld wear-resistant materials on the air inlet end of the blade. Although this treatment method can ensure the smooth operation of the fan impeller in a short period of time, as the running time increases, the wear-resistant layer will be rapidly worn and will not play a role in protecting the blades; 2) plug welding or bolting a layer of wear-resistant plate on the original ordinary steel plate blades. Although this treatment method can ensure the long-term operation of the impeller, it greatly increases the weight of the impeller, increases the operating power, and affects the safe operation of the fan. In addition, the width of the wear-resistant plate is smaller than the width of the blade. When the dust content is relatively large, the part of the blade not covered by the wear-resistant plate is still very easy to be worn. Therefore, the blades treated by the above two methods can hardly meet the needs of users.

[0005] However, in view of the shortcomings of the existing technology, it is necessary for researchers to develop a wear-resistant impeller for centrifugal fans that has a reasonable design, simple structure, good wear resistance, and long service life, which greatly reduces the overall weight of the impeller, reduces the operating power of the impeller, and has high safety performance. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a wear-resistant impeller for centrifugal fans which has a reasonable design, simple structure, good wear resistance and long service life, greatly reduces the overall weight of the impeller, reduces the operating power of the impeller and has high safety performance.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A wear-resistant impeller for a centrifugal fan comprises a middle disk, front disks are respectively arranged on both sides of the middle disk, and blades are arranged between the front disk and the middle disk;

[0009] The invention is characterized in that a plurality of protrusions are arranged on the end surface where the blade contacts the middle disk, the plurality of protrusions are spaced apart along the edge direction of the end surface where the blade contacts the middle disk, and a plurality of grooves corresponding to the plurality of protrusions are arranged on the middle disk;

[0010] A wear-resistant composite layer is arranged on the working surface of the blade, one side of the non-working surface of the blade is welded to the middle disk, and the other side of the blade is welded to the front disk.

[0011] In a preferred embodiment of the present invention, the wear-resistant impeller for a centrifugal fan also includes a middle disk guard plate which is generally annular and is used to prevent the blades from flying off the middle disk. The inner annular surface of the middle disk guard plate is welded to the middle disk through a connecting plunger, and the outer annular surface of the middle disk guard plate is in contact with the wear-resistant composite layer at the air inlet end of the blade.

[0012] In a preferred embodiment of the present invention, a layer of wear-resistant material is built-up on the weld surface between the non-working surface of the blade and the middle disk, and a side of wear-resistant material is also built-up on the weld surface between the blade and the front disk.

[0013] In a preferred embodiment of the present invention, the wear-resistant material is an alloy containing high chromium.

[0014] In a preferred embodiment of the present invention, the height of the protrusion is 6-15 mm, and the length of the protrusion is 50-120 mm.

[0015] In a preferred embodiment of the present invention, the number of the protrusions is 2-3.

[0016] In a preferred embodiment of the present invention, the middle plate is a circular plate or a sawtooth plate.

[0017] Compared with the prior art, the present invention has multiple protrusions on the middle of the end surface where the blade contacts the middle disk, and the multiple protrusions are spaced apart along the edge direction of the end surface where the blade contacts the middle disk. The middle disk is provided with multiple grooves corresponding to the multiple protrusions one by one, and one side of the non-working surface of the blade is welded to the middle disk. This structure effectively improves the connection strength between the blade and the middle disk; another, a wear-resistant composite layer is provided on the working surface of the blade, and the wear-resistant composite layer has the same size as the working surface of the blade, which effectively improves the wear resistance and hardness of the blade, and can make the hardness of the blade above HRC60. The above structure effectively improves the wear resistance and service life of the impeller, greatly reduces the overall weight of the impeller, reduces the operating power of the impeller and improves the safety performance of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 for Figure 1 Left view of .

[0021] Figure 3 It is a schematic structural diagram of the middle plate of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the blade of the present invention. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0024] Reference Figure 1-Figure 4 As shown in the figure, a wear-resistant impeller for a centrifugal fan is shown, including a middle plate 100, front plates 200 are respectively provided on both sides of the middle plate 100, and blades 300 are provided between the front plate 200 and the middle plate 100. In this embodiment, the middle plate 100 is a circular plate or a serrated plate.

[0025] A plurality of protrusions 310 are provided on the end surface where the blade 300 contacts the middle plate 100 . The plurality of protrusions 310 are spaced apart along the edge direction of the end surface where the blade 300 contacts the middle plate 100 . A plurality of grooves 110 corresponding to the plurality of protrusions 310 are provided on the middle plate 100 .

[0026] The blade 300 adopts a protrusion 310 to cooperate with the groove 110 of the middle disk 100, which simplifies the connection structure between the blade 300 and the middle disk 100. At the same time, it cooperates with the middle disk guard plate 400 to significantly enhance the strength of the blade 300 structure, further improving the service life of the impeller.

[0027] A wear-resistant composite layer is provided on the working surface 320 of the blade 300, one side of the non-working surface 330 of the blade 300 is welded to the middle disk 100, and the other side of the blade 300 is welded to the front disk 200. This structure simplifies the impeller structure, reduces the impeller mass, reduces the impeller's moment of inertia, and improves the impeller's working efficiency. On the other hand, there is no need to remove the wear-resistant composite layer at the connection between the blade 300 and the middle disk 100, which ensures that the surface of the blade 300 is completely covered by the wear-resistant composite layer, thereby improving the wear resistance of the blade 300.

[0028] When welding the blade, the protrusion 310 is matched with the groove 110, and then one side of the non-working surface 330 of the blade 300 is welded to the middle disk 100, that is, the wear-resistant composite layer on the side of the working surface 320 of the blade 300 close to the middle disk 100 is not removed, and then the side of the blade 300 close to the front disk 200 is welded to the front disk 200. In order to improve the welding strength between the blade 300 and the front disk 200, it is necessary to remove the wear-resistant composite layer on the side of the working surface 320 of the blade 300 close to the front disk 200 before welding.

[0029] The wear-resistant impeller for the centrifugal fan also includes a center disk guard plate 400 which is generally annular and is used to prevent the blades 300 from flying off the center disk 100. The inner annular surface of the center disk guard plate 400 is welded to the center disk 100 through a connecting plunger, and the outer annular surface of the center disk guard plate 400 is in contact with the wear-resistant composite layer of the air inlet end of the blade 300. The center disk guard plate 400 can effectively prevent the blades 300 from flying off the center disk 100.

[0030] The center disk guard plate 400 is enlarged at the inlet of the blade 300, and completely covers the center disk 100 at the inlet, which effectively solves the problem of large wear at the inlet of the blade 300 and near the center disk 100 when the airflow passes through the impeller, and effectively increases the service life of the center disk 100.

[0031] A layer of wear-resistant material is welded on the weld surface between the non-working surface 330 of the blade 300 and the middle disk 100, and one side of wear-resistant material is also welded on the weld surface between the blade 300 and the front disk 200. The wear-resistant material is an alloy containing high chromium. This structure effectively improves the welding strength of the welds between the blade 300 and the middle disk 100 and between the blade 300 and the front disk 200, thereby further improving the service life of the impeller.

[0032] The protrusion 310 is a cubic structure as a whole, the height a of the protrusion is 6-15 mm, the length b of the protrusion is 50-120 mm, the number of the protrusions 310 is 2-3, and the number of the protrusions 310 in this embodiment is 3. This structure effectively improves the connection strength between the blade and the center disk.

[0033] When the dust content in the gas is 100-150g / m3 Under the conditions of the above structure, when the maximum speed of the centrifugal fan is 980rpm, the impeller wear is only 0.5mm after 3 years of continuous operation.

[0034] In summary, the present invention has multiple protrusions in the middle of the end surface where the blade contacts the middle disk, and the multiple protrusions are spaced apart along the edge direction of the end surface where the blade contacts the middle disk. The middle disk is provided with multiple grooves corresponding to the multiple protrusions one by one, and one side of the non-working surface of the blade is welded to the middle disk. This structure effectively improves the connection strength between the blade and the middle disk; another, a wear-resistant composite layer is provided on the working surface of the blade, and the wear-resistant composite layer has the same size as the working surface of the blade, which effectively improves the wear resistance and hardness of the blade, and can make the hardness of the blade above HRC60. The above structure effectively improves the wear resistance and service life of the impeller, greatly reduces the overall weight of the impeller, reduces the operating power of the impeller and improves the safety performance of the impeller.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wear-resistant impeller for a centrifugal fan, comprising a middle disk, front disks are respectively arranged on both sides of the middle disk, and blades are arranged between the front disk and the middle disk; It is characterized in that A plurality of protrusions are provided on the end surface where the blade contacts the middle disk, and the plurality of protrusions are spaced apart along the edge direction of the end surface where the blade contacts the middle disk. A plurality of grooves corresponding to the plurality of protrusions are provided on the middle disk, and the height of the protrusions is 6-15 mm, the length of the protrusions is 50-120 mm, and the number of the protrusions is 2-3; A wear-resistant composite layer is provided on the working surface of the blade, and the wear-resistant composite layer has the same size as the working surface of the blade. One side of the non-working surface of the blade is welded to the middle disk, and the other side of the blade is welded to the front disk. The wear-resistant impeller also includes a center disk guard plate which is in an overall annular shape and is used to prevent the blades from flying off the center disk. The inner annular surface of the center disk guard plate is welded to the center disk through a connecting plunger, and the outer annular surface of the center disk guard plate is in contact with the wear-resistant composite layer of the air inlet end of the blade. The center disk guard plate is enlarged at the blade inlet to completely cover the center disk at the inlet. A layer of wear-resistant material is built-up welded on the weld surface between the non-working surface of the blade and the middle disk, and a layer of wear-resistant material is also built-up welded on the weld surface between the blade and the front disk; The wear-resistant material is an alloy containing high chromium; When welding the blades, the protrusions are matched with the grooves, and then the non-working side of the blade is welded to the middle disk, that is, the wear-resistant composite layer on the working side of the blade close to the middle disk is not removed, and then the side of the blade close to the front disk is welded to the front disk. In order to improve the welding strength between the blade and the front disk, the wear-resistant composite layer on the working side of the blade close to the front disk is removed before welding.

2. The wear-resistant impeller for a centrifugal fan according to claim 1, characterized in that: The middle plate is a circular plate or a sawtooth plate.

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