Split impeller convenient for erosion acceleration test

Abstract

The utility model discloses a split type impeller convenient for an erosion acceleration test, a hub and blades of the split type impeller are independent parts, the blades can be made of different materials to be tested, and the impeller can be used for simultaneously carrying out the erosion acceleration test on the blades made of various materials to be tested under the same working condition. The process of the whole test is accelerated, the cycle of material service life verification is shortened, the consistency of the working conditions of the blades of the to-be-tested materials is higher, and the test result has better contrast; besides, the hub and the blades are independently machined, mutual interference of the hub and the blades in the machining process can be effectively avoided, compared with a conventional impeller which is integrally machined, the difficulty is low, multiple devices can be adopted for machining at the same time, and the machining time can be shortened; therefore, the device can effectively solve the problem of long time consumption of the erosion acceleration test of the impellers made of various materials, and achieves the effects of reducing the test cost and shortening the verification period.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing anti-wear or corrosion, and particularly relates to a split impeller convenient for erosion acceleration test. Background Art

[0002] The impeller is one of the core components of an impeller pump. To ensure the service life of the impeller, the erosion and corrosion resistance of the material used need to be considered during design, especially the blade part that is most vulnerable to erosion and corrosion. To verify the erosion resistance of the material used for the blade, the impeller with blades made of the material to be tested needs to be placed under erosion acceleration test conditions with particles or heavy metals. By conducting erosion acceleration tests on multiple materials to be tested respectively, and finally selecting the best one.

[0003] Currently, in the erosion acceleration test, a conventional impeller as shown in Figure 1 is mostly directly used. The hub 1 and the blades 2 of the impeller are of an integral structure, and the material of each blade is the same. Each impeller can only conduct an erosion acceleration test on one material to be tested. Since the blades on the impeller are generally thin and have complex curved surfaces, high requirements are imposed on the machining accuracy. Manufacturing impellers with multiple materials to be tested respectively for erosion acceleration tests not only has a high processing cost but also leads to a long verification cycle for the erosion resistance of the material, especially when the number of blades on the impeller is large. Summary of the Invention

[0004] Aiming at the above deficiencies of the prior art, the purpose of the utility model is to provide a split impeller convenient for erosion acceleration test, solve the technical problem of the long time-consuming erosion acceleration test of impellers with multiple materials, and achieve the effects of reducing the test cost and shortening the verification cycle.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A split impeller convenient for erosion acceleration test, including a hub, a plurality of blades are circumferentially distributed on the outer periphery of the hub. A plurality of connecting grooves corresponding to the plurality of blades one by one are provided on the outer circumferential surface of the hub. The root of the blade has a connecting block adapted to the corresponding connecting groove. The connecting block is located in the corresponding connecting groove and is connected to the hub.

[0007] Further, the connecting groove extends along the axial direction of the hub, and the circumferential dimension of the connecting block matches the circumferential dimension of the connecting groove to limit the circumferential movement of the connecting block.

[0008] Further, the connecting groove extends along the axial direction of the hub. One end of the connecting groove extends to the end face of the corresponding end of the hub and forms an insertion port. The connecting block can be inserted into the connecting groove along the axial direction of the hub from the insertion port. The other end of the connecting groove forms a positioning surface, and the connecting block abuts against the positioning surface.

[0009] Further, a positioning hole is axially formed in the positioning surface along the hub. One end of the connecting block facing the positioning hole is protruded to form a positioning portion adapted to the connecting hole. The positioning portion is located in the positioning hole and restricts the radial movement of the connecting block.

[0010] Further, one end of the connecting block away from the positioning surface is protruded to form an extension portion; the hub end surface where the insertion opening is located has a ring of cutting edges, and the cutting edges form a stepped surface between the hub end surface where the insertion opening is located and the outer circumferential surface of the hub. A connecting ring is provided on the stepped surface. The inner wall of the connecting ring abuts against the extension portion to restrict the radial movement of the connecting block. The end surface of the connecting ring facing the positioning surface abuts against the connecting block, and the connecting ring is connected to the hub.

[0011] Further, the surface of the connecting block away from the hub forms the outer circumferential surface of the hub corresponding to the connecting groove. The surface of the connecting block facing the hub is protruded to form a connecting portion. The circumferential dimension of the connecting portion is smaller than the circumferential dimension of the connecting block. The connecting portion extends to form a positioning portion and an extension portion at both ends in the axial direction of the hub respectively.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. For the split impeller facilitating the erosion acceleration test of the utility model, its hub and blades are all independent components. The hub and each blade are processed separately, which can effectively avoid the interference between the hub and each blade during the processing. Not only is the processing difficulty lower than that of the conventional integral processing of the impeller, but several devices can be used for simultaneous processing, shortening the processing time, which is beneficial to reducing the test cost and shortening the verification cycle.

[0014] 2. For the split impeller facilitating the erosion acceleration test of the utility model, each blade can be made of different materials to be tested. During the test, each blade is assembled and connected to the hub through the connecting block and the connecting groove to form an impeller. With this impeller, the erosion acceleration test of the blades of multiple materials to be tested can be carried out simultaneously under the same working conditions. This is not only beneficial to accelerating the overall test process and shortening the cycle of material life verification, but also the consistency of the working conditions of the blades of each material to be tested is higher, and the test results have better comparability. Description of the Drawings

[0015] Figure 1 is a three-dimensional view of the existing impeller structure in the background technology;

[0016] Figure 2 is a three-dimensional view A of the impeller structure in the embodiment;

[0017] Figure 3 is a three-dimensional view B of the impeller structure in the embodiment;

[0018] Figure 4 is a three-dimensional view A of the hub in the embodiment;

[0019] Figure 5 Stereogram B of the hub described in the embodiment;

[0020] Figure 6 Stereogram of the blade described in the embodiment;

[0021] Wherein, there are a hub 1, blades 2, connecting grooves 3, connecting blocks 4, insertion openings 5, positioning surfaces 6, positioning holes 7, positioning parts 8, extending parts 9, step surfaces 10, connecting rings 11, and connecting parts 12. Specific embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0023] Embodiment:

[0024] Please refer to Figure 2 , Figure 4 and Figure 6 , a split impeller facilitating erosion acceleration tests, comprising a hub 1, with a plurality of blades 2 circumferentially distributed on the outer periphery of the hub 1. There are a plurality of connecting grooves 3 corresponding one-to-one with the plurality of blades 2 on the outer circumferential surface of the hub 1. The root of the blade 2 has a connecting block 4 adapted to the corresponding connecting groove 3. The connecting block 4 is located in the corresponding connecting groove 3 and is connected to the hub 1. During implementation, the connecting block 4 can be welded to the hub 1 or connected to the hub 1 by screws passing through the connecting block 4. The specific form is not limited.

[0025] For the split impeller facilitating erosion acceleration tests of the present utility model, both the hub 1 and the blades 2 are independent components. Each blade 2 can be made of different materials to be tested. During the test, each blade 2 is assembled and connected to the hub 1 through the connecting block 4 and the connecting groove 3 to form an impeller. With this impeller, erosion acceleration tests on the blades 2 of multiple materials to be tested can be carried out under the same working conditions simultaneously. This not only helps to accelerate the overall test process and shorten the cycle of material life verification, but also the consistency of the working conditions of the blades 2 of each material to be tested is higher, and the test results have better comparability. In addition, the hub 1 and each blade 2 are processed separately, which can effectively avoid interference between the hub 1 and each blade 2 during the processing. This not only has a lower processing difficulty compared to the overall processing of a conventional impeller, but also several devices can be used for simultaneous processing, which helps to shorten the processing time. Therefore, the present utility model can effectively solve the problem of long time consumption for erosion acceleration tests of impellers made of multiple materials, and achieve the effects of reducing test costs and shortening the verification cycle.

[0026] Please refer to Figure 4 and Figure 5, the connecting groove 3 extends along the axial direction of the hub 1, and the circumferential dimension of the connecting block 4 matches the circumferential dimension of the connecting groove 3. In this way, the relative circumferential rotation between the connecting block 4 and the impeller is restricted by the connecting groove 3. When the impeller rotates during the erosion acceleration test, the circumferential force at the connection between the connecting block 4 and the hub 1 or the connecting piece can be reduced, which is beneficial to improving the structural stability of the split impeller.

[0027] Please refer to Figure 3 and Figure 4 , the connecting groove 3 extends along the axial direction of the hub 1. One end of the connecting groove 3 extends to the end face of the hub 1 at the corresponding end and forms an insertion opening 5. The connecting block 4 can be inserted into the connecting groove 3 along the axial direction of the hub 1 from the insertion opening 5. The other end of the connecting groove 3 forms a positioning surface 6, and the connecting block 4 abuts against the positioning surface 6. In this way, during assembly, the connecting block 4 is inserted into the connecting groove 3 along the axial direction of the hub 1 from the insertion opening 5 and abuts against the positioning surface 6, so as to realize the axial positioning and installation of the connecting block 4, which is beneficial to improving the assembly accuracy of the split impeller.

[0028] During implementation, after the connecting block 4 is axially assembled in place, the connecting block 4 can be welded and fixed to the hub 1, or the connecting block 4 can be fixedly connected to the hub 1 by screws penetrating the connecting block 4 radially. However, when using these two connection methods, when the impeller rotates during the erosion acceleration test, the connection between the connecting block 4 and the hub 1 or the connecting piece not only needs to bear the axial force, but also needs to bear the radial force of the centrifugal rotation of the blade 2. It poses a great test for the connection or the connecting piece to maintain the structural stability of the split impeller during the test. To reduce the force on the connection or the connecting piece, the connecting groove 3 can also be designed as a T-shaped groove and a stop block is connected at the insertion opening 5, so that the connecting groove 3 also restricts the radial movement of the connecting block 4 on the hub 1 and reduces the radial force on the connection between the connecting block 4 and the hub 1 or the connecting piece. However, to ensure the connection strength between the connecting block 4 and the blade 2, the circumferential dimension and axial dimension of the connecting block 4 need to be as close as possible to those of the blade 2. The blade 2 extends spirally and its circumferential dimension is relatively large. Correspondingly, the circumferential dimension of the connecting block 4 at the root of the blade 2 is large, and the bottom width of the T-shaped groove used is undoubtedly larger. Limited by the circumferential spacing of the blade 2, it may be impossible to machine T-shaped grooves distributed at circumferential intervals. Even if they are machined, the circumferential spacing between adjacent T-shaped grooves is small and the structural strength is poor.

[0029] In view of the above situation, please refer to Figure 3 and Figure 4 , in the present invention, a positioning hole 7 is axially opened on the positioning surface 6 along the axial direction of the hub 1. Please refer to Figure 6 , one end of the connecting block 4 facing the positioning hole 7 protrudes to form a positioning portion 8 adapted to the connecting hole. Please refer to Figure 3 , the positioning portion 8 is located in the positioning hole 7 and restricts the radial movement of the connecting block 4. In addition, please refer to Figure 6, one end of the connecting block 4 away from the positioning surface 6 protrudes to form an extension part 9; Please refer to Figure 4 , the end surface of the hub 1 where the insertion port 5 is located has a circumferential cutting edge, and the cutting edge forms a stepped surface 10 between the end surface of the hub 1 where the insertion port 5 is located and the outer circumferential surface of the hub 1. Please refer to Figure 2 , a connecting ring 11 is provided on the stepped surface 10. The inner wall of the connecting ring 11 abuts against the extension part 9 to limit the radial movement of the connecting block 4. The end surface of the connecting ring 11 facing the positioning surface 6 abuts against the connecting block 4, and the connecting ring 11 is connected to the hub 1;

[0030] In this way, during assembly, first insert the positioning part 8 of the connecting block 4 into the connecting groove 3 from the insertion port 5. After the positioning part 8 is inserted into the positioning hole 7 and the connecting block 4 abuts against the positioning surface 6, install the connecting ring 11 on the stepped surface 10. The end surface of the connecting ring 11 facing the positioning surface 6 abuts against the connecting block 4, and the inner wall of the connecting ring 11 abuts against the extension part 9. Finally, weld the connecting ring 11 to the hub 1 to prevent the connecting block 4 from axially moving; The connecting groove 3 restricts the circumferential movement of the connecting block 4, the positioning surface 6 and the connecting ring 11 cooperate to restrict the axial movement of the connecting block 4, the positioning hole 7 and the connecting ring 11 cooperate to restrict the radial movement of the connecting block 4, and the positioning ring transfers the radial force to the hub 1; When the impeller for the erosion acceleration test rotates, most of the force between the connecting block 4 and the hub 1 acts on the hub 1, rather than on the connection between the connecting block 4 and the hub 1 or the connecting piece, making the structure of this split impeller more stable and reliable; In addition, during design, according to the direction of the axial force on the blade 2 when the impeller rotates in the medium, the connecting ring 11 is arranged at one end in the opposite direction of the axial force, thereby reducing the axial force on the connecting ring 11 when the impeller for the erosion acceleration test rotates, and further improving the structural stability of this split impeller.

[0031] Please refer to Figure 2 and Figure 6 , the surface of the connecting block 4 away from the hub 1 forms the outer circumferential surface of the hub 1 corresponding to the connecting groove 3. The surface of the connecting block 4 facing the hub 1 protrudes to form a connecting part 12. The circumferential dimension of the connecting part 12 is smaller than the circumferential dimension of the connecting block 4. The connecting part 12 extends respectively at both ends in the axial direction of the hub 1 to form a positioning part 8 and an extension part 9; In this way, the connecting block 4 radially extends inward through the connecting part 12 with a smaller circumferential dimension, and on the premise of meeting the assembly conditions, the influence of the connecting groove 3 on the structural strength of the hub 1 is reduced.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements to the technical solutions of the present invention, without departing from the purpose and scope of the present technical solution, should be covered within the scope of the claims of the present invention.

Claims

1. A split impeller facilitating erosion acceleration test, comprising a hub, and a plurality of blades circumferentially distributed on the outer periphery of the hub, wherein: The outer circumferential surface of the hub has a plurality of connecting grooves corresponding to the plurality of blades one by one. The root of the blade has a connecting block adapted to the corresponding connecting groove. The connecting block is located in the corresponding connecting groove and is connected to the hub.

2. The split impeller for facilitating erosion acceleration test according to claim 1, wherein: The connecting groove extends along the axial direction of the hub. The circumferential dimension of the connecting block matches the circumferential dimension of the connecting groove to limit the circumferential movement of the connecting block.

3. The split impeller facilitating erosion acceleration test according to claim 1, characterized in that: The connecting groove extends along the axial direction of the hub. One end of the connecting groove extends to the end face of the hub at the corresponding end and forms an insertion opening. The connecting block can be inserted into the connecting groove along the axial direction of the hub from the insertion opening. The other end of the connecting groove forms a positioning surface, and the connecting block abuts against the positioning surface.

4. The split impeller for facilitating erosion acceleration test according to claim 3, characterized in that: The positioning surface is provided with a positioning hole along the axial direction of the hub. One end of the connecting block facing the positioning hole protrudes to form a positioning portion adapted to the connecting hole. The positioning portion is located in the positioning hole and limits the radial movement of the connecting block.

5. The split impeller for facilitating erosion acceleration test according to claim 4, characterized in that: One end of the connecting block away from the positioning surface protrudes to form an extension portion; the end face of the hub where the insertion opening is located has a circle of cutting edges. The cutting edges form a stepped surface between the end face of the hub where the insertion opening is located and the outer circumferential surface of the hub. A connecting ring is provided on the stepped surface. The inner wall of the connecting ring abuts against the extension portion to limit the radial movement of the connecting block. The end face of the connecting ring facing the positioning surface abuts against the connecting block, and the connecting ring is connected to the hub.

6. The split impeller for facilitating erosion acceleration test according to claim 5, wherein: The surface of the connecting block away from the hub forms the outer circumferential surface of the hub at the corresponding connecting groove. The surface of the connecting block facing the hub protrudes to form a connecting portion. The circumferential dimension of the connecting portion is smaller than the circumferential dimension of the connecting block. The two ends of the connecting portion in the axial direction of the hub respectively extend to form a positioning portion and an extension portion.

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