Cast-weld impeller
The impeller manufactured through the cast welding process uses structures such as air guide plate, partition ring and positioning groove to solve the problem of deformation and loosening of traditional impellers at high temperatures, and achieves the stability and efficient operation of the impeller.
Patent Information
- Application Number
- CN202421664785.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-15
AI Technical Summary
Traditional gypsum die-cast impellers are prone to deform and cracking at high temperatures, especially the clamped connection structure is prone to loosening, resulting in uneven atmosphere in the furnace and seriously affecting product quality.
The impeller is manufactured using cast welding process, including the impeller base and blades. The structures such as air guide plate, partition ring and positioning groove ensure stable connection and precise installation of the blades, and improve the stability and rotational stability of the impeller.
Under long-term high temperature and high speed conditions, cast-welded impellers can maintain structural stability, avoid deformation and loosening, and ensure efficient operation of impellers and stability of product quality.
Smart Images
Figure CN222759989U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boiler equipment manufacturing, and specifically relates to a cast-welded impeller. Background Art
[0002] A centrifugal compressor is an auxiliary device that uses centrifugal force to throw gas into the diffuser behind the impeller to achieve air compression. The impeller is one of the core components of the centrifugal compressor, and its structural characteristics directly affect many of its structural characteristics.
[0003] A hoop-type closed impeller disclosed in patent CN116517878A includes: a wheel cover; an impeller connected to the wheel cover through a hoop; and a hoop including: a wheel cover side curling edge connected to the wheel cover; an impeller side curling edge connected to the impeller; and a curling connection portion connecting the wheel cover side curling edge with the impeller side curling edge. The wheel cover, hoop and impeller of the present invention can all be formed by mechanical processing, so the precision and roughness of the parts will be significantly better than traditional plaster die castings. The strength of the closed impeller is sufficient to withstand the same speed as the traditional open impeller, and the efficiency and surge margin are greatly improved compared to the traditional open impeller. In addition, compared to the closed impeller cast by gypsum die casting, the efficiency and surge margin will also be significantly improved due to the improved precision and roughness.
[0004] In the above scheme, each component of the impeller is formed by mechanical processing with high processing accuracy, and has better rotation performance at the same speed. However, as a boiler fan, it is easy to deform and crack when used at high temperature for a long time. In particular, the snap-on connection structure is very easy to loosen after deformation. Once the impeller structure has stability problems, it will cause uneven atmosphere in the furnace and seriously affect product quality. Utility Model Content
[0005] The purpose of the utility model is to provide a cast-welded impeller that can solve the above technical problems.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A cast-welded impeller comprises an impeller base and blades. An air guide disk is sleeved in the inner ring of the annular impeller base. The blades are evenly distributed on the impeller base. One side of the blades extends toward the center of the air guide disk and is connected to the air guide disk. A separator ring is arranged on the other side of the blade. The separator ring connects the blades to each other as a whole. The outer ring edge of the impeller base is flush with the separator ring in the axial direction.
[0008] In the cast-welded impeller, the blade comprises two opposite straight edges and an arc edge, the straight edges are connected to the impeller base, and at least a portion of the arc edge is connected to the separation ring.
[0009] In the cast-welded impeller, a positioning groove matching the straight edge is provided on the impeller base, a welding protrusion engaged with one end of the positioning groove is provided on the air guide plate, and the straight edge is connected to the convex surface of the welding protrusion on one side close to the air guide plate.
[0010] In the cast-welded impeller, the positioning groove is arranged in an arc shape from the outer ring edge to the inner ring edge, and the convex surface of the welding protrusion is in an arc shape opposite to the positioning groove.
[0011] In the cast-welded impeller, positioning holes are evenly formed on the separation ring, and at least a portion of the arc edge is inserted into the positioning holes.
[0012] In the cast-welded impeller, the separation ring is provided with an arc surface concave toward the center of the circle, and the arc edge is also provided with an arc edge matching with the arc surface of the separation ring.
[0013] In the cast-welded impeller, a trumpet-shaped outer arc edge is provided on the separation ring, and the outer arc edge extends toward the impeller base.
[0014] In the cast-welded impeller, the air guide disc is evenly provided with guide channels having the same number as the blades at the center of the circle, and the guide channels are separated from each other by the blades.
[0015] In the cast-welded impeller, the air guide plate is gradually raised from the edge toward the center, so that the direction of the guide channel is inclined toward the axial direction.
[0016] In the cast-welded impeller, a main shaft hole is provided at the center of the air guide disc, and a strengthening shaft hole is also provided around the main shaft hole.
[0017] The advantages of the utility model are:
[0018] The blades are evenly distributed on the impeller base and reinforced by an annular separator ring, which can ensure the stable operation of the blades during high-speed rotation. At the same time, the positioning grooves on the impeller base and the positioning holes in the separator ring ensure the position of each blade during impeller assembly so that the impeller rotation can remain stable and the installation of the blades is more efficient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0020] Figure 2 This is a schematic diagram of the structure of the air guide disc of the utility model.
[0021] Figure 3 This is a schematic diagram of the blade structure of the utility model.
[0022] Figure 4 This is a schematic diagram of the impeller base structure of the utility model.
[0023] Figure 5 This is a schematic diagram of the structure of the separator ring of the utility model.
[0024] In the figure, there are an impeller base 1, a positioning groove 11, a blade 2, a straight edge 21, an arc edge 22, an air guide plate 3, a welding protrusion 31, a guide channel 32, a main shaft hole 33, a strengthening shaft hole 34, a separation ring 4, and a positioning hole 41. DETAILED DESCRIPTION
[0025] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.
[0026] like Figure 1-Figure 5 The cast-welded impeller shown includes an impeller base 1 and blades 2. An air guide plate 3 is sleeved in the inner ring of the annular impeller base 1. The blades 2 are evenly distributed on the impeller base 1. One side of the blade 2 extends toward the center of the air guide plate 3 and is connected to the air guide plate 3. A separator ring 4 is provided on the other side of the blade 2. The separator ring 4 connects the blades 2 to each other as a whole. The outer ring edge of the impeller base 1 is flush with the separator ring 4 in the axial direction.
[0027] That is, the main components of the cast-welded impeller, such as the impeller base 1, blades 2, air guide plate 3 and separator ring 4, are made by a casting process and then welded together using a positioning structure, so that the impeller can be used under long-term high temperature and high speed without deformation and with stable performance, thereby ensuring the stable operation of the equipment.
[0028] The blades 2 are evenly distributed on the impeller base 1, and all the blades 2 are reinforced by the annular separator ring 4, which can ensure the stable operation of the blades 2 during high-speed rotation. At the same time, a positioning structure is set in the impeller base 1 and the separator ring 4 to ensure the position of each blade 2 during the impeller assembly so that the impeller rotation can remain stable and the installation of the blades 2 can be more efficient and accurate.
[0029] In this embodiment, the blade 2 includes two opposite straight edges 21 and an arc edge 22 , the straight edge 21 is connected to the impeller base 1 , and at least a portion of the arc edge 22 is connected to the separation ring 4 .
[0030] The straight edge 21 needs to be tightly connected to the flat impeller base 1 to ensure a certain connection strength and the sealing of the weld, while the shape of the arc edge 22 needs to cooperate with the air inlet to achieve a change in the diameter of the air path to increase the air pressure.
[0031] Preferably, a positioning groove 11 matching the straight edge 21 is provided on the impeller base 1, and the installer can accurately place the blades 2 at the appropriate position according to the positioning groove 11, so that each blade 2 can be distributed at a position with equal angles, making the rotation of the impeller smoother and more efficient.
[0032] The air guide plate 3 is provided with a welding protrusion 31 engaged with one end of the positioning groove 11, and the straight edge 21 is connected to the convex surface of the welding protrusion 31 near the air guide plate 3. The blade 2 needs to be extended to the air guide plate 3, and the captured airflow is sent to the position of the air guide plate 3, so that the radially moving airflow produces axial movement.
[0033] Preferably, the positioning groove 11 is arranged in an arc shape from the outer ring edge to the inner ring edge, and the convex surface of the welding protrusion 31 is in an arc shape opposite to the positioning groove 11 .
[0034] The arc-shaped positioning groove 11 forces the blade 2 to bend after being positioned, making better use of the passage of airflow, and the reverse-bent welding protrusion 31 makes the blade 2 wave-shaped, so that the airflow generates a second pressurization when passing through the reverse-bent section, thereby accelerating the movement of the airflow again.
[0035] In this embodiment, positioning holes 41 are evenly formed on the separation ring 4 , and at least a portion of the arc edge 22 is inserted into the positioning hole 41 .
[0036] Since the blade 2 is positioned in the curved positioning groove 11, one side of the arc edge 22 will produce a certain deformation, which will cause considerable trouble when welding the separation ring 4. Therefore, equally divided slots are preset on the separation ring 4, and the arc edges 22 of each blade 2 are inserted into them accordingly, so that the blade 2 remains in an equally divided state, and then welding is performed from the slots.
[0037] Preferably, the separator ring 4 is provided with an arc surface concave toward the center of the circle, and the arc edge 22 is also provided with an arc edge matching the arc surface of the separator ring 4 for fit.
[0038] The purpose of providing the concave arc surface on the separation ring 4 is to enhance the axial force strength of the separation ring 4 and ensure the stability of the air inlet composed of the separation ring 4, the impeller base 1 and the blades 2.
[0039] Preferably, a trumpet-shaped outer arc edge is provided on the separation ring 4 , and the outer arc edge extends toward the impeller base 1 .
[0040] The outer arc edge is mainly used to adjust the size and shape of the air inlet, extending toward the impeller base 1 to cover the arc edge 22 of the blade 2, preventing the blade surface at the arc edge 22 from ineffectively catching wind, thereby reducing the resistance of the impeller.
[0041] In this embodiment, the air guide disc 3 is evenly provided with guide channels 32 having the same number as the blades 2 at the center of the circle, and the guide channels 32 are separated from each other by the blades.
[0042] The guide channel 32 is formed by the welding protrusion 31 on the air guide plate 3. Since the convex surface of the welding protrusion 31 is connected to the side of the blade 2, the guide channel 32 is connected to the air inlet to form separate open air flow passages, so that the airflow that is still in radial movement can avoid converging and offsetting the flow velocity, and the airflow in each passage can be converged when axial movement occurs.
[0043] Preferably, the air guide plate 3 gradually bulges from the edge to the center, so that the direction of the guide channel 32 is inclined toward the axial direction. The inclined surface can also be a gradual cambered surface, so that the radially moving airflow can change the direction of movement more efficiently to avoid excessive loss of wind speed.
[0044] In this embodiment, a main shaft hole 33 is opened at the center of the air guide plate 3 , and a reinforcement shaft hole 34 is further arranged around the main shaft hole 33 .
[0045] Because the airflow needs to be gathered near the center of the impeller, the shaft connection part of the air guide plate 3 will not be set too large, and the corresponding drive shaft is also thinner. In order for the impeller to receive power output more efficiently, three reinforced shaft holes 34 are equally divided around the main shaft hole 33 to share the torque of the main shaft.
[0046] Among them, the air guide plate 3 is made into a uniform hollow casting, which reduces the weight of the component and avoids the overweight casting affecting the performance of the drive shaft during starting and stopping, thereby increasing the service life of the drive shaft.
[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A cast-welded impeller, comprising an impeller base (1) and blades (2), characterized in that: An air guide disk (3) is sleeved in the inner ring of the annular impeller base (1), the blades (2) are evenly distributed on the impeller base (1), one side of the blades (2) extends toward the center of the air guide disk (3) and is connected to the air guide disk (3), and a separation ring (4) is provided on the other side of the blades (2), the separation ring (4) connects the blades (2) to each other into one body, and the outer ring edge of the impeller base (1) is flush with the separation ring (4) in the axial direction.
2. The cast-welded impeller according to claim 1, characterized in that: The blade (2) comprises two opposite straight edges (21) and an arc edge (22); the straight edge (21) is connected to the impeller base (1), and at least a portion of the arc edge (22) is connected to the separation ring (4).
3. The cast-welded impeller according to claim 2, characterized in that: The impeller base (1) is provided with a positioning groove (11) matching with the straight edge (21), the air guide plate (3) is provided with a welding protrusion (31) engaged with one end of the positioning groove (11), and the straight edge (21) is connected to the convex surface of the welding protrusion (31) on one side close to the air guide plate (3).
4. The cast-welded impeller according to claim 3, characterized in that: The positioning groove (11) is arranged in an arc shape from the outer ring edge to the inner ring edge, and the convex surface of the welding protrusion (31) is in an arc shape opposite to the positioning groove (11).
5. The cast-welded impeller according to claim 2, characterized in that: Positioning holes (41) are evenly arranged on the separation ring (4), and at least a portion of the arc edge (22) is inserted into the positioning hole (41).
6. The cast-welded impeller according to claim 5, characterized in that: The separation ring (4) is provided with an arc surface which is concave inwardly toward the center of the circle, and the arc edge (22) is also provided with an arc edge which matches the arc surface of the separation ring (4) and is in close contact with the arc surface.
7. The cast-welded impeller according to claim 5, characterized in that: The separation ring (4) is provided with a trumpet-shaped outer arc edge, and the outer arc edge extends towards the impeller base (1).
8. The cast-welded impeller according to claim 1, characterized in that: The air guide disc (3) is evenly provided with guide channels (32) with the same number as the blades (2) at the center of the circle, and the guide channels (32) are separated from each other by the blades.
9. The cast-welded impeller according to claim 8, characterized in that: The air guide plate (3) gradually bulges from the edge toward the center of the circle, so that the direction of the guide channel (32) is inclined toward the axial direction.
10. The cast-welded impeller according to claim 1, characterized in that: A main shaft hole (33) is provided at the center of the air guide plate (3), and a strengthening shaft hole (34) is also provided around the main shaft hole (33).