A large full-adjustable mixed-flow pump impeller dynamic balancing test device and method

Abstract

The present application belongs to the technical field of mixed flow pump, and particularly relates to a large full-adjustment mixed flow pump impeller dynamic balance test device and method. The device comprises a dynamic balancing machine, the output end of the dynamic balancing machine is connected with a universal coupling, the other end of the universal coupling is connected with a first process shaft, the other end of the first process shaft is connected with a transition ring, the hub and the piston rod of the mixed flow pump are respectively detachably connected with the transition ring; further comprising a connecting ring fixedly connected with the water discharge cone of the mixed flow pump, the connecting ring is removed by turning after the test is completed, the connecting ring is connected with a second process shaft; further comprising a first support swing frame and a second support swing frame; the position of the piston rod of the mixed flow pump has three conditions, which respectively correspond to the blade being in full opening, half opening and full closing positions. The present application provides a large full-adjustment mixed flow pump impeller dynamic balance test device and method, improves the overall rigidity and test precision, is suitable for multiple opening states of the impeller, and does not damage the impeller body structure.

Description

Technical Field

[0001] This invention belongs to the field of mixed-flow pump technology, and specifically relates to a dynamic balancing test device and method for a large-scale fully adjustable mixed-flow pump impeller. Background Technology

[0002] Due to weight variations in the impeller hub and blades during casting and machining, and the clearances in the assembly of most components, the overall center of gravity of the impeller will be eccentric. During pump operation, this eccentricity will generate an additional force on the rotating parts of the pump, increasing the oscillation of the rotating components. This leads to increased pump vibration and accelerated bearing wear, affecting the safe and stable operation of the pump.

[0003] To improve the operational stability of the water pump, a dynamic balancing test can be conducted on the rotating impeller components. By removing or adding weight, the unbalance accuracy of the rotating components can be ensured to reach G2.5.

[0004] However, existing dynamic balancing test equipment has the process shaft located on one side of the impeller, resulting in poor overall system rigidity and low test accuracy. Furthermore, the dynamic balancing test equipment is only suitable for one blade opening position and cannot perform dynamic balancing tests on the impeller at multiple opening states. The dynamic balancing device can also damage the impeller's structural integrity. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a dynamic balancing test device and method for a large-scale fully adjustable mixed flow pump impeller, which improves the overall rigidity and test accuracy, is applicable to multiple opening states of the impeller, and does not damage the impeller body structure.

[0006] The technical solution adopted in this invention is as follows: A dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller includes a dynamic balancing machine. A universal coupling is connected to the output end of the dynamic balancing machine. A first process shaft is connected to the other end of the universal coupling. A transition ring is connected to the other end of the first process shaft. The impeller hub and piston rod of the mixed-flow pump are detachably connected to the transition ring. The device also includes a connecting ring fixedly connected to the discharge cone of the mixed-flow pump. After the test, the connecting ring is machined off from the discharge cone. The connecting ring is connected to a second process shaft. Furthermore, the device includes a first support frame and a second support frame. The first process shaft is fitted into the support hole of the first support frame, and the second process shaft is fitted into the support hole of the second support frame. The piston rod of the mixed-flow pump has three possible positions, corresponding to the impeller being fully open, half-open, and fully closed, respectively.

[0007] The transition ring of this invention connects the first process shaft to the hub of the mixed-flow pump, and the connecting ring connects the second process shaft to the drain cone of the mixed-flow pump, so that both ends of the impeller are supported by the process shaft, ensuring overall rigidity and improving test accuracy.

[0008] The design of the transition ring in this invention includes the state of the blade in the fully open, half-open and fully closed positions, which improves the accuracy of the impeller dynamic balancing test structure.

[0009] In this invention, the hub and piston rod of the mixed-flow pump are detachably connected to the transition ring. After the test is completed, the connecting ring is machined off from the drain cone. Thus, this invention does not damage the impeller body structure and can be used for overall turning over during impeller assembly and testing.

[0010] As a preferred embodiment of the present invention, the transition ring includes an integrally formed outer connecting ring and an inner connecting ring. The end of the first process shaft away from the universal coupling and the end of the mixed flow pump hub away from the drain cone are both fitted with the outer connecting ring through a stop. The first process shaft and the hub of the mixed flow pump are respectively bolted to the outer connecting ring. The inner connecting ring is bolted to the piston rod of the mixed flow pump.

[0011] The reference surface of the outer connecting ring is a circular surface that mates with the hub stop. The fit between this circular surface and the hub is a transition fit, and the roundness of this circular surface should be controlled within 0.02mm. The fit between the outer connecting ring and the first process shaft is also a transition fit, and the coaxiality of the mating circular surface of the outer connecting ring and the first process shaft relative to the reference surface should be controlled within 0.02mm.

[0012] As a preferred embodiment of the present invention, the axial distance between the end face of the outer connecting ring near the hub and the end face of the inner connecting ring near the piston rod is equal to the axial distance between the end face of the hub away from the drain cone and the end face of the piston rod away from the drain cone; the piston rod has three positions, corresponding to the blades being in the fully open, half open and fully closed positions respectively.

[0013] The L value of the transition ring, which is the distance from the transition ring to the right end face of the hub mating surface, should be the distance from the left end face of the hub to the left end face of the piston rod when the blade is in the fully open, half open and fully closed positions, respectively. Various transition rings are designed according to different L values ​​to meet the dynamic balance test requirements when the blade is in different angles.

[0014] As a preferred embodiment of the present invention, the outer connecting ring is provided with a plurality of countersunk holes for bolting to the wheel hub, and the outer connecting ring is also provided with a plurality of through holes for bolting to the wheel hub and the first process shaft simultaneously.

[0015] Two types of holes are evenly distributed on the left side of the outer connecting ring. One type is a countersunk hole for the connecting bolt between the outer connecting ring and the hub. The depth of the countersunk hole should ensure that the connecting bolt does not protrude from the left end face. The other type is a through hole for the connecting ring between the outer connecting ring and the hub and the process shaft.

[0016] As a preferred embodiment of the present invention, a plurality of first bolt holes are evenly distributed at one end of the first process shaft near the transition ring, and a stop is provided at one end of the first process shaft near the transition ring, and the stop of the first process shaft is transitionally fitted with the transition ring; a first mating surface for assembly with the first support swing frame is provided on the first process shaft.

[0017] The first process shaft is assembled with the transition ring, and the fit is a transition fit. A first mating surface is provided on the first process shaft for contact with the first support frame, and the coaxiality relative to the reference surface is controlled within 0.02 mm. A connection structure for a universal coupling is provided at the left end of the first process shaft.

[0018] As a preferred embodiment of the present invention, the connecting ring is welded to the drain cone of the mixed flow pump or integrally cast with the drain cone, the connecting ring and the second process shaft are fitted by a stop, and the connecting ring is connected to the second process shaft by bolts.

[0019] The connecting ring is welded onto the drain cone structure during welding. If the drain cone is a casting, it is cast together with the drain cone body. The outer circle on the left side of the drain cone mates with the hub, with a single-sided clearance controlled between 0.01 and 0.03 mm. This circular surface serves as the reference surface. The connecting ring mates with the second process shaft using a clearance fit, with the coaxiality of this circular surface relative to the reference surface controlled within 0.02 mm.

[0020] As a preferred embodiment of the present invention, the connecting ring is provided with a plurality of mating holes; the mating holes are machined by the connecting ring and the second process shaft using a CNC machine tool after being connected, or the connecting ring and the process shaft are machined using the same boring die.

[0021] The connecting ring and the second process shaft are connected using pin bolts. The mating holes are machined together on a CNC machine tool after the connecting ring and the second process shaft are connected (or the connecting ring and the process shaft use the same boring die, ensuring the positional error of the mating holes is no greater than 0.02mm). The mating bolt holes are evenly distributed in a circumferential array, and the coaxiality error between the distribution circle of the mating holes and the stop is no greater than 0.02mm. The remaining parts of the connecting ring and the drain cone are machined as a single unit. After the dynamic balancing test is completed, the connecting ring is machined away using the outer circle of the left side of the drain cone as a reference.

[0022] As a preferred embodiment of the present invention, the second process shaft has a plurality of second bolt holes evenly distributed at one end near the connecting ring, and a stop is provided at one end of the second process shaft near the connecting ring, and the stop of the second process shaft is clearance-fitted with the connecting ring; the second process shaft is provided with a second mating surface for assembly with the second support swing frame.

[0023] The second process shaft is assembled with the connecting ring using a clearance fit. A second mating surface is provided on the second process shaft that mates with the second support frame, and the coaxiality of this surface relative to the reference surface is controlled within 0.02 mm.

[0024] As a preferred embodiment of the present invention, the hub of the mixed flow pump is provided with an annular balance groove near the flow surface, and the bottom of the balance groove is provided with a number of evenly distributed screw holes for mounting counterweights. After the counterweights are installed, the balance groove is sealed with a sealing plate.

[0025] This invention incorporates a balance groove on the left end face of the wheel hub, near the flow surface. The balance groove is machined together with the wheel hub, and its coaxiality with the stop on the left end face of the wheel hub is controlled within 0.02mm. Eight evenly distributed screw holes are arranged in an array at the bottom of the balance groove for mounting counterweights. After the counterweights are installed, a sealing plate is used to seal the balance groove. The weld on the left end face of the wheel hub must be ground smooth. After the counterweight is applied, a dynamic balance re-test is performed to prevent deviations caused by the sealing weld. If deviations occur, the sealing plate will be lightened to ensure the accuracy of the overall dynamic balance test.

[0026] A method for dynamic balancing test of a large fully adjustable mixed-flow pump impeller includes the following steps: S1: After all machining processes of the impeller components are completed, the quality meets the requirements of the design drawings, and the static balance test results meet the process requirements, preparations are made for the dynamic balance test. S2: Adjust the distance between the first support pendulum frame and the second support pendulum frame according to the assembly drawing of the dynamic balancing device; S3: Locate the center of the dynamic balancing machine's power head and the first and second support swing frames, and adjust their horizontal and axial positions. The horizontality and concentricity of the first and second support swing frames should be controlled within 0.05mm. S4: Apply lubricating oil to the contact area between the first support frame and the first process shaft, and the contact area between the second support frame and the second process shaft; S5: Assemble the transition ring with the impeller. The gap between the transition ring and the hub contact surface and the gap between the transition ring and the piston rod contact surface shall not exceed 0.02mm. S6: Assemble the assembled impeller with the first process shaft and the second process shaft. The gap between the mating surfaces of the first process shaft and the transition ring and the gap between the mating surfaces of the second process shaft and the connecting ring shall not exceed 0.02mm. The coaxiality between the first process shaft and the transition ring and the coaxiality between the second process shaft and the connecting ring shall not exceed 0.05mm. S7: Hoist the impeller dynamic balancing device onto the first and second support swing frames; S8: Check the runout of the first process shaft, the second process shaft and the outer circle of the left end of the impeller by rotating the machine. Use a frame level to measure the level of the journals at both ends of the first process shaft and the second process shaft. The levelness should be controlled within 0.03mm / m. After alignment, lower the safety frame to press the first process shaft and the second process shaft. S9: Connect the first process shaft to the power head of the dynamic balancing machine using a universal coupling, with a clearance of no more than 0.02mm. S10: Start from low speed, gradually adjust and increase speed from low speed to medium speed and high speed, and finally reach the maximum balance speed of the impeller. S11: Observe the unbalanced weight and position displayed on the screen, repeat the test 5 to 10 times, and record the unbalanced weight and position each time; S12: Stop the machine and adjust the counterweight according to the weight and position of the unbalanced weight. The counterweight block is fixed with the thread in the wheel hub balance groove. S13: Repeat steps S10 to S12 until the pump impeller reaches the balance requirement; S14: Remove the impeller dynamic balancing device, replace the transition ring, and perform dynamic balancing tests on the blades in other states. Repeat steps S5 to S11 to confirm that the dynamic balancing test results in the fully open, half-open, and fully closed positions of the blades meet the requirements. S15: Lower the impeller dynamic balancing device, install the sealing plate of the hub balancing groove, and grind the weld smooth. Repeat steps S7 to S11. If deviation occurs, grind the sealing plate to remove weight until the dynamic balancing test results meet the requirements. S16: Lift down the impeller dynamic balancing device and disassemble it, then machine and remove the connecting ring on the drain cone.

[0027] The beneficial effects of this invention are as follows: 1. The transition ring of the present invention connects the first process shaft to the hub of the mixed flow pump, and the connecting ring connects the second process shaft to the drain cone of the mixed flow pump, so that both ends of the impeller are supported by the process shaft, ensuring overall rigidity and improving test accuracy.

[0028] 2. The design of the transition ring of the present invention includes the state of the blade in the fully open, half open and fully closed positions, which improves the accuracy of the impeller dynamic balance test structure.

[0029] 3. In this invention, the hub and piston rod of the mixed-flow pump are detachably connected to the transition ring. After the test is completed, the connecting ring is machined off from the drain cone. Thus, this invention does not damage the impeller body structure and can be used for overall turning over during impeller assembly and testing. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the transition ring structure; Figure 4 It is an assembly drawing of the connecting ring and the drain cone; Figure 5 This is a schematic diagram of the structure of the first process shaft; Figure 6 This is a schematic diagram of the second process shaft; Figure 7 yes Figure 2 A magnified view of a portion of point A in the middle.

[0031] In the diagram: 1-Dynamic balancing machine; 2-Universal coupling; 3-First process shaft; 4-Transition ring; 5-Connecting ring; 6-Second process shaft; 7-First support swing frame; 8-Second support swing frame; 9-Mixed flow pump; 31-First bolt hole; 32-First mating surface; 41-Outer connecting ring; 42-Inner connecting ring; 51-Handling hole; 61-Second bolt hole; 62-Second mating surface; 91-Hub; 92-Piston rod; 93-Drain cone; 94-Blade; 411-Handling countersunk hole; 412-Handling through hole; 911-Balance groove; 912-Screw hole; 913-Sealing plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0034] like Figure 1 and Figure 2 As shown, the large-scale fully adjustable mixed-flow pump impeller dynamic balancing test device of this embodiment includes a dynamic balancing machine 1, the output end of which is connected to a universal coupling 2, the other end of which is connected to a first process shaft 3, and the other end of which is connected to a transition ring 4. The hub 91 and piston rod 92 of the mixed-flow pump 9 are detachably connected to the transition ring 4. It also includes a connecting ring 5 fixedly connected to the drain cone 93 of the mixed-flow pump 9. After the test, the connecting ring 5 is machined off from the drain cone 93. The connecting ring 5 is connected to a second process shaft 6. It also includes a first support swing frame 7 and a second support swing frame 8. The first process shaft 3 is sleeved in the support hole of the first support swing frame 7, and the second process shaft 6 is sleeved in the support hole of the second support swing frame 8. The piston rod 92 of the mixed-flow pump 9 has three positions, corresponding to the blade 94 being in the fully open, half-open, and fully closed positions, respectively.

[0035] The transition ring 4 of the present invention connects the first process shaft 3 to the hub 91 of the mixed flow pump 9, and the connecting ring 5 connects the second process shaft 6 to the drain cone 93 of the mixed flow pump 9, so that both ends of the impeller are supported by the process shaft, ensuring overall rigidity and improving test accuracy.

[0036] The design of the transition ring 4 of the present invention includes the states of the blade 94 in the fully open, half-open and fully closed positions, which improves the accuracy of the impeller dynamic balance test structure.

[0037] In this invention, the hub 91 and piston rod 92 of the mixed flow pump 9 are detachably connected to the transition ring 4. After the test is completed, the connecting ring 5 is machined off from the drain cone 93. Thus, this invention does not damage the impeller body structure and can be used for overall turning over during impeller assembly and testing.

[0038] Specifically, such as Figure 3 As shown, the transition ring 4 includes an integrally formed outer connecting ring 41 and an inner connecting ring 42. The end of the first process shaft 3 away from the universal coupling 2 and the end of the hub 91 of the mixed flow pump 9 away from the drain cone 93 are both fitted with the outer connecting ring 41 through a stop. The first process shaft 3 and the hub 91 of the mixed flow pump 9 are respectively bolted to the outer connecting ring 41. The inner connecting ring 42 is bolted to the piston rod 92 of the mixed flow pump 9.

[0039] The reference surface of the outer connecting ring 41 is a circular surface that mates with the stop of the hub 91. The mating method between this circular surface and the hub 91 is a transition fit, and the roundness of this circular surface should be controlled within 0.02mm. The mating method between the outer connecting ring 41 and the first process shaft 3 is also a transition fit, and the coaxiality of the mating circular surface of the outer connecting ring 41 and the first process shaft 3 relative to the reference surface should be controlled within 0.02mm.

[0040] It should be noted that the axial distance between the end face of the outer connecting ring 41 near the hub 91 and the end face of the inner connecting ring 42 near the piston rod 92 is equal to the axial distance between the end face of the hub 91 away from the drain cone 93 and the end face of the piston rod 92 away from the drain cone 93. The piston rod 92 has three positions, corresponding to the blade 94 being in the fully open, half-open, and fully closed positions, respectively.

[0041] The L value of the transition ring 4, which is the distance from the mating surface of the transition ring 4 to the right end face of the hub 91, should be the distance from the left end face of the hub 91 to the left end face of the piston rod 92 when the blade 94 is in the fully open, half open and fully closed positions respectively. The transition ring 4 is designed in various ways according to different L values ​​to meet the dynamic balance test requirements of the blade 94 at different angles.

[0042] As a preferred embodiment of the present invention, the outer connecting ring 41 is provided with a plurality of countersunk holes 411 for bolting to the hub 91, and the outer connecting ring 41 is also provided with a plurality of through holes 412 for bolting to the hub 91 and the first process shaft 3 simultaneously.

[0043] Two types of holes are evenly distributed on the left side of the outer connecting ring 41. One type is the countersunk hole 411 for connecting the outer connecting ring 41 and the hub 91. The depth of the countersunk hole 411 should ensure that the connecting bolt does not protrude from the left end face. The other type is the through hole 412 for connecting the outer connecting ring 41 and the hub 91 and the process shaft.

[0044] Specifically, such as Figure 5 As shown, the first process shaft 3 has a plurality of first bolt holes 31 evenly distributed at one end near the transition ring 4, and a stop is provided at one end of the first process shaft 3 near the transition ring 4. The stop of the first process shaft 3 is in transition fit with the transition ring 4. The first process shaft 3 is provided with a first mating surface 32 for assembly with the first support frame 7.

[0045] The first process shaft 3 is assembled with the transition ring 4 in a transition fit. A first mating surface 32 is provided on the first process shaft 3 for contact with the first support frame 7, and the coaxiality relative to the reference surface is controlled within 0.02 mm. A connection structure to the universal coupling 2 is provided at the left end of the first process shaft 3.

[0046] Specifically, such as Figure 4 As shown, the connecting ring 5 is welded to the drain cone 93 of the mixed flow pump 9 or cast integrally with the drain cone 93. The connecting ring 5 and the second process shaft 6 are fitted with a stop joint, and the connecting ring 5 is connected to the second process shaft 6 by bolts.

[0047] The connecting ring 5 is welded onto the drain cone 93 structural component during welding. If the drain cone 93 is a casting, it is cast together with the drain cone 93 body. The outer circle on the left side of the drain cone 93 mates with the hub 91, with the clearance on one side controlled between 0.01 and 0.03 mm. This circular surface serves as the reference surface. The connecting ring 5 mates with the second process shaft 6 using a clearance fit, with the coaxiality of this circular surface relative to the reference surface controlled within 0.02 mm.

[0048] The connecting ring 5 has a plurality of mating holes 51 evenly distributed on it; the mating holes 51 are connected to the second process shaft 6 by the connecting ring 5 and then machined by the same CNC machine tool, or the connecting ring 5 and the process shaft are machined by the same boring die.

[0049] The connection between the connecting ring 5 and the second process shaft 6 is achieved using pin bolts. The mating hole 51, after being connected to the second process shaft 6 by the connecting ring 5, is machined using a CNC machine tool (or the connecting ring 5 and the process shaft use the same boring die, ensuring the positional error of the mating hole 51 is no greater than 0.02mm). The mating bolt holes are evenly distributed in an array along the circumferential direction, and the coaxiality error between the mating hole distribution circle and the stop is no greater than 0.02mm. The remaining parts of the connecting ring 5 are machined integrally with the drain cone 93. After the dynamic balancing test is completed, the connecting ring 5 is machined away using the outer circle on the left side of the drain cone 93 as a reference.

[0050] Specifically, such as Figure 6 As shown, the second process shaft 6 has a plurality of second bolt holes 61 evenly distributed at one end near the connecting ring 5, and a stop is provided at one end of the second process shaft 6 near the connecting ring 5. The stop of the second process shaft 6 is clearance-fitted with the connecting ring 5. The second process shaft 6 is provided with a second mating surface 62 for assembly with the second support swing frame 8.

[0051] The second process shaft 6 is assembled with the connecting ring 5 in a clearance fit. The second process shaft 6 is provided with a second mating surface 62 that is compatible with the second support frame 8, and the coaxiality of the surface relative to the reference surface is controlled within 0.02 mm.

[0052] Furthermore, such as Figure 7 As shown, the hub 91 of the mixed flow pump 9 is provided with an annular balance groove 911 near the flow surface. The bottom of the balance groove 911 is provided with several evenly distributed screw holes 912 for mounting counterweights. After the counterweights are installed, the balance groove 911 is sealed with a sealing plate 913.

[0053] This invention incorporates a balance groove 911 on the left end face of the hub 91, near the flow surface. The balance groove 911 is machined together with the hub 91, and its coaxiality with the stop on the left end face of the hub 91 is controlled within 0.02 mm. Eight evenly distributed screw holes 912 are provided at the bottom of the balance groove 911 for mounting counterweights. After the counterweights are installed, a sealing plate 913 is used to seal the balance groove 911. The weld seam on the left end face of the hub 91 must be ground smooth. After the counterweight is added, a dynamic balance re-test is performed to prevent deviations caused by the sealing weld. If deviations occur, the sealing plate 913 will be lightened to ensure the accuracy of the overall dynamic balance test.

[0054] The dynamic balancing test method for the impeller of a large fully adjustable mixed-flow pump in this embodiment includes the following steps: S1: After all machining processes of the impeller components are completed, the quality meets the requirements of the design drawings, and the static balance test results meet the process requirements, preparations are made for the dynamic balance test. S2: Adjust the distance between the first support frame 7 and the second support frame 8 according to the assembly drawing of the dynamic balancing device; S3: Locate the center of the power head of the dynamic balancing machine 1 and the first support swing frame 7 and the second support swing frame 8, and adjust the horizontal and axial positions. The horizontality and concentricity of the first support swing frame 7 and the second support swing frame 8 should be controlled within 0.05mm. S4: Apply lubricating oil to the contact area between the first support frame 7 and the first process shaft 3, and the contact area between the second support frame 8 and the second process shaft 6 to reduce friction; S5: Assemble the transition ring 4 with the impeller. The gap between the transition ring 4 and the hub 91 and the gap between the transition ring 4 and the piston rod 92 are both 0mm, and locally no more than 0.02mm. S6: Assemble the assembled impeller with the first process shaft 3 and the second process shaft 6. The mating surface gap between the first process shaft 3 and the transition ring 4, and the mating surface gap between the second process shaft 6 and the connecting ring 5 are both 0mm, and locally not greater than 0.02mm. The coaxiality between the first process shaft 3 and the transition ring 4, and the coaxiality between the second process shaft 6 and the connecting ring 5 are not greater than 0.05mm. S7: Hoist the impeller dynamic balancing device onto the first support swing frame 7 and the second support swing frame 8; take care to avoid impact during hoisting to prevent damage to the sensor; S8: Check the runout of the first process shaft 3, the second process shaft 6 and the outer circle of the left end of the impeller by rotating the machine. Use a frame level to measure the level of the journals at both ends of the first process shaft 3 and the second process shaft 6. The levelness should be controlled within 0.03mm / m. After alignment, lower the safety frame to press the first process shaft 3 and the second process shaft 6. It is required that the first process shaft 3, the second process shaft 6 and the impeller do not wobble. S9: Connect the first process shaft 3 to the power head of the dynamic balancing machine 1 using the universal coupling 2. The clearance should be 0mm, and locally no more than 0.02mm. S10: Start from low speed, gradually adjust and increase speed from low speed to medium speed and high speed, and finally reach the maximum balance speed of the impeller. S11: Observe the unbalanced weight and position displayed on the screen, repeat the test 5 to 10 times, and record the unbalanced weight and position each time; S12: Stop the machine and adjust the counterweight according to the weight and position of the unbalanced weight. The counterweight block is fixed with the thread in the balance groove 911 of the hub 91. S13: Repeat steps S10 to S12 until the pump impeller reaches the balance requirement; S14: Remove the impeller dynamic balancing device, replace the transition ring 4, and perform dynamic balancing tests on the blade 94 in other states. Repeat steps S5 to S11 to confirm that the dynamic balancing test results of the blade 94 in the fully open, half-open and fully closed positions meet the requirements. S15: Lower the impeller dynamic balancing device, install and weld the sealing plate 913 of the balance groove 911 of the hub 91, and grind the weld smooth. Repeat steps S7 to S11. If there is a deviation, grind the sealing plate 913 to remove the weight until the dynamic balancing test results meet the requirements. S16: Lift down the impeller dynamic balancing device and disassemble it, then machine and remove the connecting ring 5 on the drain cone 93.

[0055] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller, characterized in that: The system includes a dynamic balancing machine (1), the output end of which is connected to a universal coupling (2), the other end of which is connected to a first process shaft (3), the other end of which is connected to a transition ring (4), and the hub (91) and piston rod (92) of the mixed flow pump (9) are detachably connected to the transition ring (4); it also includes a connecting ring (5) fixedly connected to the drain cone (93) of the mixed flow pump (9), after the test is completed, the connecting ring (5) is machined off from the drain cone (93), and the connecting ring (5) is connected to a second process shaft (6); it also includes a first support swing frame (7) and a second support swing frame (8), the first process shaft (3) is sleeved in the support hole of the first support swing frame (7), and the second process shaft (6) is sleeved in the support hole of the second support swing frame (8); the piston rod (92) of the mixed flow pump (9) has three positions, corresponding to the blade (94) being in the fully open, half open and fully closed positions respectively; The transition ring (4) includes an integrally formed outer connecting ring (41) and an inner connecting ring (42). The end of the first process shaft (3) away from the universal coupling (2) and the end of the hub (91) of the mixed flow pump (9) away from the drain cone (93) are both fitted with the outer connecting ring (41) through a stop. The first process shaft (3) and the hub (91) of the mixed flow pump (9) are respectively bolted to the outer connecting ring (41); the inner connecting ring (42) is bolted to the piston rod (92) of the mixed flow pump (9). The connecting ring (5) is welded to the drain cone (93) of the mixed flow pump (9) or cast integrally with the drain cone (93). The connecting ring (5) and the second process shaft (6) are fitted with a stop, and the connecting ring (5) is connected to the second process shaft (6) by bolts.

2. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The axial distance between the end face of the outer connecting ring (41) near the hub (91) and the end face of the inner connecting ring (42) near the piston rod (92) is equal to the axial distance between the end face of the hub (91) away from the drain cone (93) and the end face of the piston rod (92) away from the drain cone (93).

3. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The outer connecting ring (41) is evenly distributed with a number of engagement countersunk holes (411) for bolting to the hub (91), and the outer connecting ring (41) is also evenly distributed with a number of engagement through holes (412) for bolting to the hub (91) and the first process shaft (3) at the same time.

4. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The first process shaft (3) has a number of first bolt holes (31) evenly distributed at one end near the transition ring (4). The first process shaft (3) has a stop at one end near the transition ring (4). The stop of the first process shaft (3) is in transition fit with the transition ring (4). The first process shaft (3) is provided with a first mating surface (32) for assembly with the first support frame (7).

5. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The connecting ring (5) is evenly distributed with a number of mating holes (51); the mating holes (51) are connected to the second process shaft (6) by the connecting ring (5) and then machined by the same CNC machine tool, or the connecting ring (5) and the process shaft are machined by the same boring die.

6. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The second process shaft (6) has several second bolt holes (61) evenly distributed at one end near the connecting ring (5). The second process shaft (6) has a stop at one end near the connecting ring (5). The stop of the second process shaft (6) is clearance-fitted with the connecting ring (5). The second process shaft (6) is provided with a second mating surface (62) for assembly with the second support frame (8).

7. The dynamic balancing test device for a large-scale fully adjustable mixed-flow pump impeller according to claim 1, characterized in that: The hub (91) of the mixed flow pump (9) is provided with an annular balance groove (911) near the flow surface. The bottom of the balance groove (911) is provided with several evenly distributed screw holes (912) for mounting counterweights. After the counterweights are installed, the balance groove (911) is sealed with a sealing plate (913).

8. A method for dynamic balancing test of a large fully adjustable mixed-flow pump impeller, using the dynamic balancing test apparatus for a large fully adjustable mixed-flow pump impeller as described in claim 7, characterized in that: Includes the following steps: S1: After all machining processes of the impeller components are completed, the quality meets the requirements of the design drawings, and the static balance test results meet the process requirements, preparations are made for the dynamic balance test. S2: According to the assembly drawing of the dynamic balancing device, adjust the distance between the first support pendulum (7) and the second support pendulum (8); S3: Find the center of the power head of the dynamic balancing machine (1) and the first support swing frame (7) and the second support swing frame (8), and adjust the horizontal and axial positions. The horizontality and concentricity of the first support swing frame (7) and the second support swing frame (8) should be controlled within 0.05mm. S4: Apply lubricating oil to the contact area between the first support frame (7) and the first process shaft (3) and the contact area between the second support frame (8) and the second process shaft (6); S5: Assemble the transition ring (4) with the impeller. The gap between the mating surfaces of the transition ring (4) and the hub (91) and the mating surfaces of the transition ring (4) and the piston rod (92) shall not exceed 0.02 mm. S6: Assemble the assembled impeller and the first process shaft (3) and the second process shaft (6). The gap between the mating surfaces of the first process shaft (3) and the transition ring (4) and the gap between the mating surfaces of the second process shaft (6) and the connecting ring (5) shall not exceed 0.02 mm. The coaxiality between the first process shaft (3) and the transition ring (4) and the coaxiality between the second process shaft (6) and the connecting ring (5) shall not exceed 0.05 mm. S7: Hoist the impeller dynamic balancing device onto the first support swing frame (7) and the second support swing frame (8); S8: Check the runout of the first process shaft (3), the second process shaft (6) and the outer circle of the left end of the impeller by rotating the machine. Use a frame level to measure the level of the journals at both ends of the first process shaft (3) and the second process shaft (6). The levelness should be controlled within 0.03mm / m. After alignment, lower the safety frame to press the first process shaft (3) and the second process shaft (6). S9: Connect the first process shaft (3) to the power head of the dynamic balancing machine (1) using a universal coupling (2), with a clearance of no more than 0.02mm. S10: Start from low speed, gradually adjust and increase speed from low speed to medium speed and high speed, and finally reach the maximum balance speed of the impeller. S11: Observe the unbalanced weight and position displayed on the screen, repeat the test 5 to 10 times, and record the unbalanced weight and position each time; S12: Stop the machine and adjust the counterweight according to the weight and orientation of the unbalanced weight. The counterweight block is fixed with the thread in the balance groove (911) of the hub (91). S13: Repeat steps S10 to S12 until the pump impeller reaches the balance requirement; S14: Remove the impeller dynamic balancing device, replace the transition ring (4), and perform dynamic balancing tests on the blade (94) in other states. Repeat steps S5 to S11 to confirm that the dynamic balancing test results in the fully open, half-open and fully closed positions of the blade (94) meet the requirements. S15: Lower the impeller dynamic balancing device, install the sealing plate (913) of the balance groove (911) of the hub (91), and grind the weld smooth. Repeat steps S7 to S11. If there is a deviation, grind the sealing plate (913) to remove the weight until the dynamic balancing test results meet the requirements. S16: Lift down the impeller dynamic balancing device and disassemble it, then machine and remove the connecting ring (5) on the drain cone (93).

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