Static balance tool for runner of pump turbine

Abstract

The utility model discloses a static balance tool for a runner of a pump turbine. The lifting device consists of a first screw, a convex ball, a supporting sleeve, a second screw, a lifting shaft, a first bolt, a flange, a second bolt, a lifting piece, a ball seat support and a synchronous cylinder. The flange, the convex ball, the support sleeve, the hanger shaft and the like are mounted in a rotating wheel uprightly-placed state, and static balance is performed in a rotating wheel reversely-placed state; the rotating wheel is reversely supported on the synchronous cylinder piston rod, the synchronous cylinder piston rod descends, and the rotating wheel floats in high-pressure oil in the ball seat supporting concave ball through the convex ball for static balance. The utility model has the advantages of low cost, strong versatility, high efficiency and high precision.

Description

Technical Field

[0001] The utility model relates to the field of water pumps and water turbines, in particular to a static balancing tool for a water pump and water turbine runner. Background Art

[0002] The runner is the core component of a pump-turbine unit. To ensure smooth operation of the unit, the runner must be statically balanced after manufacturing to reduce the weight of the unbalanced areas. Conventional runner static balancing tools are used with the runner in an upright position. Because the outer diameter of the static balancing ball seat support or convex ball, determined based on the runner weight, is larger than the inner diameter of the runner's drain cone, to avoid interference between the inner diameter of the drain cone and the ball seat support and convex ball during static balancing, the drain cone and upper crown must be separated into two parts. The joint surface between the drain cone and the upper crown is located at a certain position along the runner's height. The drain cone does not participate in the static balancing of the runner. After the runner is balanced, the drain cone and the upper crown are welded together. Current methods weld the drain cone onto a finely machined and balanced runner. This causes deformation of the finely machined area, damage to the runner surface due to weld spatter, and a certain period of time to repair weld defects. Furthermore, the uneven weld between the drain cone and the upper crown and the misalignment of the drain cone with the runner's rotation axis due to installation deviations can adversely affect the balanced runner.

[0003] Therefore, in order to solve the above problems, it is necessary to propose a static balancing tool for a pump turbine runner. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a low-cost, highly versatile, highly efficient, and highly precise static balancing tool for pump-turbine runners. The technical solution of this utility model is as follows: it comprises a first screw, a convex ball, a support sleeve, a second screw, a suspension shaft, a first bolt, a flange, a second bolt, a suspension bracket, a ball seat support, and a synchronous cylinder. The flange is secured to the runner via the first bolt, the convex ball is secured to the support sleeve via the first screw, the suspension shaft is secured to the support sleeve via the second screw, the support sleeve is secured to the flange via the second bolt, the suspension bracket is mounted on the flange, the ball seat support is located directly below the convex ball, and the synchronous cylinder piston rod bears against the outer surface A of the runner crown.

[0005] In the above-mentioned static balancing tool for the pump turbine runner, eight first bolts are evenly distributed around the circumference; the flange and the runner are matched with a centering stop.

[0006] In the above-mentioned static balancing tool for the pump turbine runner, the first screw is a hexagon socket head screw; the convex ball and the support sleeve are matched with a centering stop.

[0007] In the above-mentioned static balancing tool for the pump turbine runner, eight second screws are evenly distributed around the circumference; the second screws are hexagonal cylindrical head screws and the cylindrical head protrudes from the crown end surface B of the runner; the hanging shaft and the support sleeve are matched with a centering stop; the first outer diameter of the hanging shaft is 2 mm smaller than the first inner diameter of the drain cone.

[0008] In the above-mentioned pump-turbine runner static balancing tool, eight second bolts are evenly distributed around the circumference; the support sleeve and the flange are matched with a centering stop.

[0009] In the above-mentioned static balancing tool for the pump turbine runner, two lifting tabs installed on the flange are evenly distributed in the circumference; the lifting tabs are connected to the flange by threads.

[0010] In the above-mentioned pump-turbine runner static balancing tool, four synchronous cylinders are evenly distributed around the circumference; the end faces of the piston rods of the four synchronous cylinders are supported at the same height on the outer side surface A of the runner; and the outer side surface A of the runner is perpendicular to the runner axis.

[0011] In the above-mentioned static balancing tool for the pump turbine runner, the second outer diameter of the ball seat support is 30 mm smaller than the second inner diameter of the support sleeve.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. When the size of the wheel to be balanced changes, only the flange needs to be replaced accordingly. The support sleeve, convex ball, ball seat support, etc. do not need to be replaced. It has strong versatility and low cost.

[0014] 2. The convex ball and the support sleeve, the support sleeve and the flange, and the flange and the runner are respectively matched with centering stoppers, which can realize the coaxial installation of the convex ball, support sleeve, flange and runner, ensure the accuracy of the static balancing result, and avoid the error of the static balancing result of the runner caused by different axes.

[0015] 3. The second screw is a hexagon socket head screw and the cylindrical head protrudes from the upper crown end surface B of the runner, which is not only compact in structure but also convenient for loosening and tightening the second screw when disassembling and assembling the hanging shaft.

[0016] 4. The hanging shaft and the support sleeve are matched with a centering stop to avoid the second screw from bearing shear stress during the flipping of the front and rear wheels of static balance, thereby improving safety and reducing the diameter of the second screw. The structure is compact, light and low in cost.

[0017] 5. The lifting hook and the flange are connected by threads. Before achieving the static balance of the runner, the lifting hook can be removed to avoid the different weights of the two lifting hooks affecting the static balance result of the runner.

[0018] 6. The end faces of the piston rods of the four synchronous cylinders are supported at the same height on the outer side A of the upper crown of the runner, and the outer side A of the upper crown of the runner is perpendicular to the axis of the runner, so that the convex ball, support sleeve, flange and axis of the runner are perpendicular during the descending process of the piston rod of the synchronous cylinder, avoiding the error of static balance result caused by the tilt of the above axis.

[0019] 7. After the unbalanced runner is floated by high-pressure oil, the runner axis will tilt due to the runner's own weight imbalance. At the same time, the flange and support sleeve coaxially installed with the runner will tilt accordingly. The second outer diameter of the ball seat support is 30mm smaller than the second inner diameter of the support sleeve. This can avoid the above-mentioned tilt causing the second inner circle of the support sleeve to contact the second outer circle of the ball seat support, thereby ensuring the accuracy of the runner's weight imbalance and orientation determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief introduction to the drawings required for the embodiments:

[0021] Figure 1 This is a schematic diagram of the wheel upright balancing tool after installation.

[0022] Figure 2 This is a P-direction schematic diagram of the wheel upright balancing tool after installation.

[0023] Figure 3 This is a Q-direction schematic diagram after the wheel upright balancing tool is installed.

[0024] Figure 4 This is a schematic diagram of the static balance of the inverted wheel.

[0025] Explanation of the numbers in the figure: 1-first screw, 2-convex ball, 3-support sleeve, 4-second screw, 5-hanging shaft, 6-first bolt, 7-flange, 8-second bolt, 9-hanging, 10-ball seat support, 11-synchronizing cylinder, 12-piston rod, 13-outer side surface A of the upper crown of the runner, 14-end surface B of the upper crown of the runner, 15-first outer circle, 16-first inner circle of the drain cone, 17-second outer circle, 18-second inner circle, 19-end surface C of the lower ring, 20-square box, 21-through hole, 22-lower end surface D, 23-upper end surface E, 24-concave ball. DETAILED DESCRIPTION

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood based on specific circumstances.

[0027] In addition, in the description of this solution, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only simplified descriptions for the convenience of describing this solution, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this solution.

[0028] like Figure 1 、 Figure 4 As shown, the utility model is composed of a first screw 1, a convex ball 2, a support sleeve 3, a second screw 4, a hanging shaft 5, a first bolt 6, a flange 7, a second bolt 8, a hanging bracket 9, a ball seat support 10, and a synchronous cylinder 11.

[0029] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the runner is being lowered with its ring end face C19 supported on a square box 20; the flange 7 is fixed to the runner by a first bolt 6; the convex ball 2 is fixed to the support sleeve 3 by a first screw 1; the hanging shaft 5 is fixed to the support sleeve 3 by a second screw 4; the assembled convex ball 2, support sleeve 3, and hanging shaft 5 are hung on the flange 7, and the support sleeve 3 is fixed to the flange 7 by a second bolt 8; the runner is turned over to an inverted position with the lower ring end face C19 facing upwards by using the through hole 21 on the hanging shaft 5 and two circumferentially distributed hanging hooks 9 installed on the flange 7; as shown Figure 2As shown, the inverted runner is lifted to the top of the ball seat support 10 through the through hole 21 on the hanging shaft 5 and dropped to the second outer circle 17 of the ball seat support 10 and penetrated into the second inner circle 18 of the support sleeve 3 and the lower end surface D22 of the support sleeve 3 is lower than the upper end surface E23 of the ball seat support 10 by 5 to 10 mm; the piston rod 12 of the synchronous cylinder 11 rises synchronously to support the outer side surface A13 of the upper crown of the runner and lifts the runner 5 mm; the position of the ball seat support 10 is adjusted to the circumferential gap between the second outer circle 17 of the ball seat support 10 and the second inner circle 18 of the support sleeve 3 is uniform; the second screw 4 is loosened, and the hanging shaft 5 is removed; the hanging ladder 9 is removed; the piston rod 12 of the synchronous cylinder 11 drops synchronously to the ball seat support 10, and the distance between the concave ball 24 and the convex ball 2 is 2 to 5 mm; 0 High-pressure oil is injected into the concave ball 24, and the piston rod 12 of the synchronous cylinder 11 drops synchronously until it is separated from the outer side surface A13 of the upper crown of the runner, and the runner is floated by the oil film between the convex ball 2 and the concave ball 24 of the ball seat support 10; the inclination of the lower ring end face C19 perpendicular to the runner axis caused by the unbalanced weight is measured, and according to the inclination, the unbalanced weight position of the runner is confirmed and the weight to be removed at the unbalanced weight is calculated; the piston rod 12 of the synchronous cylinder 11 rises synchronously to lift the runner until the oil film between the convex ball 2 and the concave ball 24 of the ball seat support 10 disappears; at the unbalanced weight position, according to the calculated weight to be removed, a weight-reducing hole is machined on the runner; the injection of high-pressure oil and the falling and floating of the runner are repeated until the weight to be removed at the unbalanced weight position calculated according to the inclination of the lower ring end face C19 of the runner is less than the allowable value, and the runner is balanced.

[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the claims and their equivalents.

Claims

1. A static balancing tool for a pump turbine runner, characterized by: The invention comprises a first screw (1), a convex ball (2), a support sleeve (3), a second screw (4), a hanging shaft (5), a first bolt (6), a flange (7), a second bolt (8), a hanging bracket (9), a ball seat support (10), and a synchronous cylinder (11). The flange (7) is fixed to the runner through the first bolt (6), the flange (7) and the runner are matched with a centering stop, the convex ball (2) is fixed to the support sleeve (3) through the first screw (1), the convex ball (2) and the support sleeve (3) are matched with a centering stop, the hanging shaft (5) is fixed to the support sleeve (3) through the second screw (4), the support sleeve (3) is fixed to the flange (7) through the second bolt (8), the support sleeve (3) and the flange (7) are matched with a centering stop, the hanging bracket (9) is installed on the flange (7), the ball seat support (10) is located directly below the convex ball (2), and the piston rod (12) of the synchronous cylinder (11) is supported on the outer side surface A (13) of the crown of the runner.

2. A pump-turbine runner static balancing tool according to claim 1, characterized in that: There are eight first bolts (6) evenly distributed around the circumference.

3. The pump-turbine runner static balancing tool according to claim 1, characterized in that: The first screw (1) is a hexagon socket head screw.

4. A pump-turbine runner static balancing tool according to claim 1, characterized in that: Eight second screws (4) are evenly distributed around the circumference; the second screws (4) are hexagonal cylindrical head screws, and the cylindrical head protrudes from the upper crown end surface B (14) of the runner; the hanging shaft (5) and the support sleeve (3) are matched with a centering stop; the diameter of the first outer circle (15) of the hanging shaft (5) is 2 mm smaller than the diameter of the first inner circle (16) of the drain cone.

5. The pump-turbine runner static balancing tool according to claim 1, characterized in that: Eight second bolts (8) are evenly distributed around the circumference.

6. The pump-turbine runner static balancing tool according to claim 1, characterized in that: The two hanging hooks (9) installed on the flange (7) are evenly distributed in the circumferential direction; the hanging hooks (9) and the flange (7) are connected by threads.

7. The pump-turbine runner static balancing tool according to claim 1, characterized in that: The four synchronous cylinders (11) are evenly distributed in the circumferential direction; the end faces of the piston rods (12) of the four synchronous cylinders (11) are supported at the same height on the outer side surface A (13) of the upper crown of the runner; and the outer side surface A (13) of the upper crown of the runner is perpendicular to the axis of the runner.

8. The pump-turbine runner static balancing tool according to claim 1, characterized in that: The diameter of the second outer circle (17) of the ball seat support (10) is 30 mm smaller than the diameter of the second inner circle (18) of the support sleeve (3).

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