Vertical static balance process for pumped storage impeller

Abstract

The invention relates to the technical field of water turbine impellers, and discloses a pumping and storage impeller vertical static balance process, which comprises the following steps of: 1, mounting a positioning flange and an impeller, drawing + / -X and + / -Y by taking the center of the impeller as an original point, supporting the impeller by three dynamometers, enabling a supporting included angle alpha of the three dynamometers to be 120 degrees, enabling a dynamometer I to be positioned on a + X axis, enabling a dynamometer II to be positioned in a second quadrant, and enabling a dynamometer II to be positioned in a third quadrant; the third dynamometer is located in a third quadrant; 2, acquiring three dynamometer parameters A, B and C in sequence; step 3, calculating the unbalance amount: the unbalance amount on the X axis: X = A-(B + C) * sin30 degrees; the unbalance amount on the Y axis is Y = (B-C) * cos 30 degrees; the total unbalance G is calculated according to the unbalance on the X axis and the unbalance on the Y axis; 4, the orientation is determined, and the included angle between the orientation and the Y axis is arctan (X / Y); and step 5, the unbalance amount of the product is removed.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine impellers, and in particular to a vertical static balancing process for a pumped storage impeller. Background Art

[0002] During the manufacturing process of pumped storage turbine generator sets, there is a core component, the impeller. During the process of the unit constantly switching the rotation direction, it is subjected to the impact of high-pressure water at every moment. Before it is completed and shipped out of the factory, it needs to undergo a static balance test. The pumped storage impeller is welded together by the upper crown, lower ring, and blades. After processing, a static balance test is carried out and the weight is taken to make the unbalance of the impeller reach the design allowable value.

[0003] Chinese patent document CN104101463A discloses a method for measuring the static balance of a rotating body, which includes the following steps: (1) arranging a measuring device; (2) placing the rotating body on a pallet, and positioning a core shaft to support the rotating body and position it at the center hole of the rotating body; (3) operating a lifting drive device to drive the positioning core shaft to slowly rise; (4) operating the lifting drive device to drive the positioning core shaft to slowly descend, and the rotating body falls along with the positioning core shaft and is supported by the pallet. At this time, the weight of each part of the rotating body on the circular surface is measured by different weighing sensors, and through calculation and analysis by a controller, the imbalance amount and imbalance direction of the rotating body are displayed digitally or graphically on a display screen.

[0004] Chinese patent document CN116502361A discloses a method and system for processing static balancing of a cast crowned blade disk. A model for calculating the imbalance of a part is constructed based on basic parameters of the part, and the imbalance caused by different correction amounts of the part on the static balancing is pre-calculated based on the constructed model. Then, the changing relationship between the different imbalance amounts of the part and the correction amount is obtained, which is convenient for the subsequent measurement of the initial imbalance amount of the part to be processed, and the correction amount is obtained based on the initial imbalance amount. Then, the part is further corrected and processed, and then measured again until the imbalance amount of the part meets the preset requirements.

[0005] The prior art has the following deficiencies: in the prior art, the unbalance amount and unbalance orientation of the rotating body are calculated and analyzed by a controller, which requires the purchase of a controller and increases production costs; and other static balancing processing methods require complex steps and place high demands on technical personnel. Summary of the invention

[0006] The present invention provides a low-cost, fast and accurate pumped storage impeller vertical static balancing process for verifying and correcting the unbalance of the impeller, comprising the following steps:

[0007] Step 1. Install the positioning flange and impeller, draw ±X and ±Y with the center of the impeller as the origin, the impeller is supported by three dynamometers, the support angle α of the three dynamometers is 120°, dynamometer 1 is located on the +X axis, dynamometer 2 is located in the second quadrant, and dynamometer 3 is located in the third quadrant;

[0008] Step 2, obtaining three dynamometer parameters, namely A, B and C;

[0009] Step 3: Calculate the unbalance:

[0010] Unbalance on the X axis: X = A - (B + C) × sin30°;

[0011] Unbalance on the Y axis: Y = (B-C) × cos30°;

[0012] The total unbalance G is calculated based on the unbalance on the X-axis and Y-axis:

[0013] Step 4: Determine the orientation: the angle between it and the Y axis is arctan(X÷Y);

[0014] Step 5: Remove the unbalanced amount of the product.

[0015] Preferably, in step 5, a biased method is used to remove duplicates:

[0016] When the total unbalanced weight G exceeds the required value by 5 kg, the center of the impeller is offset from the center line of the machine tool by a certain distance L, and then turning is performed. The calculation formula for the offset during turning is as follows:

[0017]

[0018] L: eccentric distance, unit: mm

[0019] R: Radius of the weighing position, unit: mm

[0020] Rw: The radius of the unbalanced position during the test, in mm

[0021] G: unbalanced weight, unit Kg

[0022] H: turning depth, unit: mm

[0023] ρ: Product material density, unit: g / cm 3 .

[0024] Preferably, in step 5, drilling is used to remove duplication:

[0025] When the unbalanced weight exceeds the required value by 5Kg, drilling is used to remove the weight.

[0026] Determine the number of holes to be drilled N = (4·RW·G) / [π·φ2 ·R·(h-h1)·ρ·10 -6 ]

[0027] N: number of holes drilled, in units

[0028] R: Radius of the weighing position, unit: mm

[0029] Rw: The radius of the unbalanced position during the test, in mm

[0030] G: unbalanced weight, unit Kg

[0031] φ: diameter of the drill hole, in mm

[0032] h: drilling depth, unit: mm

[0033] h1: Sealing steel plate thickness, unit: mm

[0034] ρ: Product material density, unit: g / cm 3 .

[0035] Preferably, in step 6, after removing the unbalance, the static balance is checked again until the unbalance meets the design requirement.

[0036] Preferably, in step 1.1, the positioning flange and the product positioning adopt transition fit to ensure the coaxiality of the positioning flange and the product, and then ensure the coaxiality of the support point pitch circle and the product;

[0037] Step 1.2, the blind holes of the support pads on the positioning flange are of the same depth, so as to ensure that the plane formed by the three dynamometer support points is in a horizontal position.

[0038] Preferably, in step 1.3, two top screw holes need to be designed when designing the positioning flange, for use in disassembling the positioning flange after the static balance test is completed.

[0039] Preferably, in step 1.4, the pad needs to be heat treated to a hardness of HRC58-65 to ensure that it does not deform during the test.

[0040] The present invention has the following beneficial effects:

[0041] The present application can quickly and accurately check the unbalance amount and orientation of the product, and does not require the purchase of a controller to directly obtain the correction parameters by technical calculation. The entire calculation process is simple, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the installation of the pumped storage impeller of the present invention;

[0043] Figure 2 Schematic diagram of the pumped storage impeller in Example 1;

[0044] Figure 3 This is a schematic diagram of the repair position of the pumped storage impeller in Example 1;

[0045] Figure 4 A schematic diagram of the installation position of the dynamometer of the pumped storage impeller of the present invention;

[0046] Figure 5 Schematic diagram of the pumped storage impeller in Example 2;

[0047] Figure 6 This is a schematic diagram of the repair position of the pumped storage impeller in Example 2. DETAILED DESCRIPTION

[0048] The following is further described in detail through specific implementation methods:

[0049] 1. The reference numerals in the drawings of the specification include: positioning flange 1, impeller 2, supporting platform 3, dynamometer 1 4, dynamometer 2 5, dynamometer 3 6, supporting pad 7, positioning stop 8.

[0050] The overall test operation steps are as follows:

[0051] 1. Correct the plane A on the support to make it level and then press it tightly onto the ground rail;

[0052] 2. Connect and fasten the positioning flange 1 and the impeller 2 into one;

[0053] 3. Place the dynamometer at an appropriate position on the supporting platform 3;

[0054] 4. Turn on the dynamometer power supply and set the dynamometer value to zero;

[0055] 5. Slowly lift the product onto the dynamometer;

[0056] 6. Check whether the plane of the positioning flange 1 is parallel to the supporting platform 3;

[0057] 7. Wait for the dynamometer to stabilize and then read and print the dynamometer reading;

[0058] 8. Calculate the imbalance amount and orientation based on the dynamometer readings;

[0059] 9. Remove the unbalanced amount of the product;

[0060] 10. After removing the imbalance, perform static balance check again until the imbalance meets the design requirement.

[0061] Example 1

[0062] like Figure 1-4 As shown, a vertical static balancing process for a pumped storage impeller includes the following steps:

[0063] Step 1: Install the positioning flange 1 and the impeller 2. The impeller 2 is supported by three dynamometers:

[0064] 1.1. Connect and fasten the positioning flange 1 and the impeller 2 as one. The positioning flange 1 and the product positioning adopt H7 / js6 transition fit to ensure the coaxiality of the positioning flange 1 and the product, and then ensure the coaxiality of the support point pitch circle and the product;

[0065] 1.2. The blind holes of the support pad 7 on the positioning flange 1 have the same depth, so as to ensure that the plane formed by the three dynamometer support points is in a horizontal position;

[0066] 1.3. The coaxiality between the blind hole pitch circle of the support pad 7 assembled on the positioning flange 1 and the positioning stop 8 must reach 0.05mm / m to ensure the coaxiality between the support point pitch circle and the product. At the same time, the flange flatness must reach 0.05mm / m to ensure the horizontality of the product during testing;

[0067] 1.4. Two top screw holes need to be designed when designing the positioning flange 1, which are used for disassembly of the positioning flange 1 after the static balance test is completed;

[0068] 1.5. Since the dynamometer and the support pad 7 are in point contact, the pad needs to be heat treated to a hardness of HRC58-65;

[0069] 1.6. Draw ±X and ±Y with the center of the impeller 2 as the origin. The support angle α of the three dynamometers is 120°. The dynamometer 1 4 is located on the +X axis, the dynamometer 2 5 is located in the second quadrant, and the dynamometer 3 6 is located in the third quadrant.

[0070] Step 2, obtaining three dynamometer parameters, namely A, B and C;

[0071] Step 3: Calculate the unbalance:

[0072] Unbalance on the X axis: X = A - (B + C) × sin30°;

[0073] Unbalance on the Y axis: Y = (B-C) × cos30°;

[0074] The total unbalance G is calculated based on the unbalance on the X-axis and Y-axis:

[0075] Step 4: Determine the orientation: the angle between it and the Y axis is arctan(X÷Y);

[0076] Step 5: Remove the unbalanced amount of the product:

[0077] Take the biased approach to remove duplicates:

[0078] When the total unbalanced weight G exceeds the required value by 5 kg, the center of the impeller 2 is offset from the center line of the machine tool by a certain distance L, and then turning is performed. The calculation formula for the offset during turning is as follows:

[0079]

[0080] L: eccentric distance, unit: mm

[0081] R: Radius of the weighing position, unit: mm

[0082] Rw: The radius of the unbalanced position during the test, in mm

[0083] G: unbalanced weight, unit Kg

[0084] H: turning depth, unit: mm

[0085] ρ: Product material density, unit: g / cm 3 ;

[0086] Step 6: After removing the imbalance, check the static balance again until the imbalance meets the design requirement.

[0087] Example 2

[0088] like Figure 4-6 As shown, a vertical static balancing process for a pumped storage impeller includes the following steps:

[0089] Step 1: Install the positioning flange 1 and the impeller 2. The impeller 2 is supported by three dynamometers:

[0090] 1.1. Connect and fasten the positioning flange 1 and the impeller 2 as one. The positioning flange 1 and the product positioning adopt H7 / js6 transition fit to ensure the coaxiality of the positioning flange 1 and the product, and then ensure the coaxiality of the support point pitch circle and the product;

[0091] 1.2. The blind holes of the support pad 7 on the positioning flange 1 have the same depth, so as to ensure that the plane formed by the three dynamometer support points is in a horizontal position;

[0092] 1.3. The coaxiality between the blind hole pitch circle of the support pad 7 assembled on the positioning flange 1 and the positioning stop 8 must reach 0.05mm / m to ensure the coaxiality between the support point pitch circle and the product. At the same time, the flange flatness must reach 0.05mm / m to ensure the horizontality of the product during testing;

[0093] 1.4. Two top screw holes need to be designed when designing the positioning flange 1, which are used for disassembly of the positioning flange 1 after the static balance test is completed;

[0094] 1.5. Since the dynamometer and the support pad 7 are in point contact, the pad needs to be heat treated to a hardness of HRC58-65;

[0095] 1.6. Draw ±X and ±Y with the center of the impeller 2 as the origin. The support angle α of the three dynamometers is 120°. The dynamometer 1 4 is located on the +X axis, the dynamometer 2 5 is located in the second quadrant, and the dynamometer 3 6 is located in the third quadrant.

[0096] Step 2, obtaining three dynamometer parameters, namely A, B and C;

[0097] Step 3: Calculate the unbalance:

[0098] Unbalance on the X axis: X = A - (B + C) × sin30°;

[0099] Unbalance on the Y axis: Y = (B-C) × cos30°;

[0100] The total unbalance G is calculated based on the unbalance on the X-axis and Y-axis:

[0101] Step 4: Determine the orientation: the angle between it and the Y axis is arctan(X÷Y);

[0102] Step 5: Remove the unbalanced amount of the product:

[0103] In step 5, drilling is used to remove duplication:

[0104] When the unbalanced weight exceeds the required value by 5Kg, drilling is used to remove the weight.

[0105] Determine the number of holes to be drilled N = (4·RW·G) / [π·φ 2 ·R·(h-h1)·ρ·10 -6 ]

[0106] N: number of holes drilled, in units

[0107] R: Radius of the weighing position, unit: mm

[0108] Rw: The radius of the unbalanced position during the test, in mm

[0109] G: unbalanced weight, unit Kg

[0110] φ: diameter of the drill hole, in mm

[0111] h: drilling depth, unit: mm

[0112] h1: Sealing steel plate thickness, unit: mm

[0113] ρ: Product material density, unit: g / cm 3 ;

[0114] Step 6: After removing the imbalance, check the static balance again until the imbalance meets the design requirement.

[0115] A person of ordinary skill in the art is aware of all the common technical knowledge in the technical field to which the invention belongs before the filing date or the priority date, is able to obtain all the prior art in the field, and has the ability to apply conventional experimental means before that date. A person of ordinary skill in the field can improve and implement the present solution in combination with his or her own ability under the enlightenment given by the present application. Some typical well-known structures or well-known methods should not become an obstacle for a person of ordinary skill in the field to implement the present application. It should be pointed out that for a person of ordinary skill in the field, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by the present application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A vertical static balancing process for a pumped storage impeller, comprising the following steps: Step 1. Install the positioning flange and impeller, draw ±X and ±Y with the center of the impeller as the origin, the impeller is supported by three dynamometers, the support angle α of the three dynamometers is 120°, dynamometer 1 is located on the +X axis, dynamometer 2 is located in the second quadrant, and dynamometer 3 is located in the third quadrant; Step 2, obtaining three dynamometer parameters, namely A, B and C; Step 3: Calculate the unbalance: Unbalance on the X axis: X = A-(B+C)×sin30°; Unbalance on the Y axis: Y = (B-C) × cos30°; The total unbalance G is calculated based on the unbalance on the X-axis and Y-axis: Step 4: Determine the orientation: the angle between it and the Y axis is arctan(X÷Y); Step 5: Remove the unbalanced amount of the product.

2. The vertical static balancing process for pumped storage impeller according to claim 1, characterized in that: In step 5, the method of partial car is used to remove duplicates: When the total unbalanced weight G exceeds the required value by 5 kg, the center of the impeller is offset from the center line of the machine tool by a certain distance L, and then turning is performed. The calculation formula for the offset during turning is as follows: L: eccentric distance, unit: mm R: Radius of the weighing position, unit: mm Rw: The radius of the unbalanced position during the test, in mm G: unbalanced weight, unit Kg H: turning depth, unit: mm ρ: Product material density, unit: g / cm 3 . Preferably, in step 5, drilling is used to remove duplication: When the unbalanced weight exceeds the required value by 5Kg, drilling is used to remove the weight. Determine the number of holes to be drilled N = (4·RW·G) / [π·φ 2 ·R·(h-h1)·ρ·10 -6 ] N: number of holes drilled, in units R: Radius of the weighing position, unit: mm Rw: The radius of the unbalanced position during the test, in mm G: unbalanced weight, unit Kg φ: diameter of the drill hole, in mm h: drilling depth, in mm h1: Sealing steel plate thickness, unit: mm ρ: Product material density, unit: g / cm 3 .

3. The vertical static balancing process for pumped storage impeller according to claim 1, characterized in that: In step 5, drilling is used to remove duplication: When the unbalanced weight exceeds the required value by 5Kg, drilling is used to remove the weight. Determine the number of holes to be drilled N = (4·RW·G) / [π·φ 2 ·R·(h-h1)·ρ·10 -6 ] N: number of holes drilled, in units R: Radius of the weighing position, unit: mm Rw: The radius of the unbalanced position during the test, in mm G: unbalanced weight, unit Kg φ: diameter of the drill hole, in mm h: drilling depth, unit: mm h1: Sealing steel plate thickness, unit: mm ρ: Product material density, unit: g / cm 3 .

4. The vertical static balancing process for a pumped storage impeller according to any one of claims 1 to 3, characterized in that: Step 6: After removing the imbalance, check the static balance again until the imbalance meets the design requirement.

5. The vertical static balancing process for pumped storage impeller according to claim 4 is characterized in that: Step 1.1, the positioning flange and the product positioning adopt transition fit; Step 1.2, the blind hole depth of the supporting pad on the positioning flange is consistent.

6. The vertical static balancing process for pumped storage impeller according to claim 5, characterized in that: Step 1.3: Two top screw holes need to be designed when designing the positioning flange.

7. The vertical static balancing process for a pumped storage impeller according to claim 6, characterized in that: Step 1.4: The pad needs to be heat treated to a hardness of HRC58-65.

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