Rotating wheel counterweight structure and water turbine

Abstract

The utility model provides a rotating wheel counterweight structure and a water turbine, the rotating wheel counterweight structure is applied to the water turbine, the rotating wheel counterweight structure comprises a rotating wheel, the rotating wheel comprises an upper crown, the upper crown is provided with an inner cavity, and the cavity wall of the inner cavity is provided with a to-be-counterweighted part far away from the rotating axis of the rotating wheel; and the counterweight body is arranged on the to-be-counterweighted part, and the central axis of the counterweight body is perpendicular to the rotating axis of the rotating wheel. According to the balance weight device, the to-be-balanced part is located on the cavity wall of the inner cavity of the upper crown of the rotating wheel and is far away from the rotating axis of the rotating wheel, and the balance weight body is arranged on the to-be-balanced part, so that the central axis of the balance weight body is perpendicular to the rotating axis of the rotating wheel; when the rotating wheel rotates, centrifugal force generated by rotation of the rotating wheel acts on the balance weight body in the direction perpendicular to the connecting position of the balance weight body and the to-be-balanced part, the balance weight body and the to-be-balanced part can be connected more tightly, and therefore the problem that the balance weight body falls off in the rotating process of the rotating wheel is avoided, and the use safety of the balance weight body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water turbine mechanical equipment, and in particular to a runner counterweight structure and a water turbine. Background Art

[0002] The static balancing of the runner is a necessary step in the manufacturing process of the turbine runner. The weight is counterbalanced according to the static balancing result to ensure that the unbalanced moment of the runner meets the requirements. At present, the counterbalance method used by large and medium-sized Francis runners in the upper crown cavity has problems such as low counterbalance accuracy, low counterbalance efficiency, and the counterweight block is easy to fall off during the operation of the runner. Summary of the invention

[0003] The present application provides a wheel counterweight structure, aiming to solve the technical problem that the counterweight body weld is subjected to large centrifugal force and there is a risk of falling off, and at the same time improve the counterweight accuracy and counterweight efficiency.

[0004] In order to solve the above technical problems, on the one hand, the present application provides a runner counterweight structure applied to a water turbine, comprising:

[0005] The rotating wheel comprises an upper crown, the upper crown has an inner cavity, and the cavity wall of the inner cavity has a portion to be counterweighted away from the rotation axis of the rotating wheel;

[0006] The counterweight body is arranged on the part to be counterweighted, and the central axis of the counterweight body is perpendicular to the rotation axis of the rotating wheel.

[0007] In some embodiments, the portion to be weighted is located at the farthest end of the cavity wall of the inner cavity relative to the rotation axis of the rotating wheel.

[0008] In some embodiments, the cavity wall of the inner cavity includes a first inclined surface and a second inclined surface that are inclined relative to the rotation axis of the rotating wheel and are arranged at an angle, and the portion to be counterweighted is located at the connection between the first inclined surface and the second inclined surface.

[0009] In some embodiments, the first inclined surface and the second inclined surface are smoothly transitioned at the connection between them.

[0010] In some embodiments, the counterweight body has a first surface facing the portion to be counterweighted, and an edge of the first surface is welded to the first inclined surface and the second inclined surface.

[0011] In some embodiments, the first inclined surface and the second inclined surface are symmetrically arranged relative to a plane passing through the central axis of the counterweight body and perpendicular to the rotation axis of the rotating wheel.

[0012] In some embodiments, the counterweight body includes:

[0013] A base weight block including a first surface;

[0014] The first standard counterweight block is detachably connected to a side of the basic counterweight block facing away from the first surface.

[0015] In some embodiments, the counterweight further includes:

[0016] a second standard counterweight block detachably connected between the first standard counterweight block and the base counterweight block, or detachably connected to a side of the first standard counterweight block away from the base counterweight block; and / or the geometric centers of the base counterweight block, the first standard counterweight block, and the second standard counterweight block are all located on the central axis of the counterweight; and / or the weight of the first standard counterweight block is different from the weight of the second standard counterweight block.

[0017] In some embodiments, at least four fastening holes are provided on each of the base counterweight block, the first standard counterweight block, and the second standard counterweight block.

[0018] On the other hand, the present application also provides a water turbine, which includes the above-mentioned runner counterweight structure.

[0019] In the present application, the runner includes a crown. The crown has an inner cavity, and the cavity wall of the inner cavity has a portion to be counterweighted away from the rotation axis of the runner. The present application arranges the counterweight on the portion to be counterweighted, and the central axis of the counterweight is perpendicular to the rotation axis of the runner. When the unit where the runner is located operates, the centrifugal force generated by the rotation of the runner acts on the counterweight in a direction perpendicular to the connection part between the counterweight and the portion to be counterweighted, which helps the counterweight and the portion to be counterweighted to be connected more tightly, thereby avoiding the problem of the counterweight falling off during the rotation of the runner and improving the use safety of the counterweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] In order to more comprehensively understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0022] Figure 1 is a schematic structural diagram of the runner counterweight structure provided in the embodiment of the present application;

[0023] Figure 2 is a cross-sectional view of the connection part between the base counterweight block of the runner counterweight structure provided in the embodiment of the present application and the inner cavity of the crown of the runner;

[0024] Figure 3 is another perspective view of the cross-section of the connection part between the base counterweight block of the runner counterweight structure provided in the embodiment of the present application and the inner cavity of the crown of the runner;

[0025] Figure 4 It is a schematic structural diagram of a counterweight provided in an embodiment of the present application;

[0026] Figure 5 It is a schematic structural diagram of a first standard counterweight block of a runner counterweight structure provided in an embodiment of the present application;

[0027] Figure 6 It is a schematic structural diagram of a first standard counterweight block of another runner counterweight structure provided in an embodiment of the present application;

[0028] Figure 7 It is a schematic structural diagram of a first standard counterweight block of yet another runner counterweight structure provided in an embodiment of the present application.

[0029] Explanation of reference numerals:

[0030] 1 - Counterweight, 11 - Basic counterweight block, 12 - First standard counterweight block, 13 - Second standard counterweight block, 21 - Groove, 100 - Upper crown, 101 - Inner cavity, 102 - First inclined surface, 103 - Second inclined surface, 111 - First surface, 200 - Part to be counterweighted. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0033] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that this application can be implemented without these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of this application with unnecessary details. Therefore, this application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in this application.

[0034] An embodiment of this application provides a runner weight balancing structure, which is applied to a water turbine and will be described in detail below.

[0035] Figure 1 is a schematic structural diagram of the runner weight balancing structure provided in the embodiment of this application. Refer to Figure 1 In some embodiments, the runner weight balancing structure includes a runner, and the runner includes a crown 100. The crown 100 has an inner cavity 101, and a portion to be weighted 200 that is away from the rotation axis of the runner is provided on the cavity wall of the inner cavity 101. A weight 1 is disposed on the portion to be weighted 200, and the central axis of the weight 1 is perpendicular to the rotation axis of the runner.

[0036] In the related art, a common way to balance the runner weight is to set the weight 1 on the first inclined surface 102 of the inner cavity 101 of the crown 100 of the runner. When the runner rotates, the centrifugal force acts on the weight 1 in a direction perpendicular to the rotation axis of the runner. However, the weight 1 is connected to the first inclined surface 102, and the centrifugal force received by the weight 1 is not perpendicular to the connection surface between the weight 1 and the inner cavity 101 of the crown 100. Therefore, the weight 1 will receive a component force of the centrifugal force parallel to the connection surface between the weight 1 and the inner cavity 101 of the crown 100, causing the weld between the weight 1 and the first inclined surface 102 to bear this centrifugal force component. Therefore, there is a risk of the weight 1 falling off in this weight balancing method.

[0037] In the embodiment of this application, the weight 1 is set on the portion to be weighted 200 that is away from the rotation axis of the runner on the cavity wall of the inner cavity 101 of the crown 100, and the central axis of the weight 1 is perpendicular to the rotation axis of the runner. When the runner rotates, the generated centrifugal force acts on the weight 1 in a direction perpendicular to the rotation axis of the runner. In the embodiment of this application, the central axis of the weight 1 is perpendicular to the rotation axis of the runner. Therefore, the centrifugal force will make the connection between the weight 1 and the portion to be weighted 200 tighter, thereby avoiding the weight 1 falling off during the rotation of the runner and improving the use safety of the weight.

[0038] In some embodiments, the part 200 to be counterweighted is located at the farthest end of the cavity wall of the inner cavity 101 relative to the rotation axis of the runner. Refer to Figure 1 , in the embodiments of the present application, the counterweight 1 is arranged at the rightmost end of the inner cavity 101 of the upper crown 100. When the runner rotates, the counterweight 1 will be subject to a centrifugal force, and the direction of the centrifugal force is the same as the direction of the central axis of the counterweight 1. Under the action of the centrifugal force, the counterweight 1 will tend to move away from the rotation axis. In the embodiments of the present application, the part 200 to be counterweighted is arranged at the farthest end of the cavity wall of the inner cavity 101 relative to the rotation axis of the runner. The part 200 to be counterweighted will act on the counterweight 1 a reaction force with the same magnitude and opposite direction to the centrifugal force. In this way, the centrifugal force received by the counterweight 1 will be offset, and the counterweight 1 will no longer tend to move away from the rotation axis, avoiding the problem of the counterweight 1 falling off during the rotation of the runner and improving the use safety of the counterweight.

[0039] Continue to refer to Figure 1 , in some embodiments, the cavity wall of the inner cavity 101 includes a first inclined surface 102 and a second inclined surface 103 that are inclined relative to the rotation axis of the runner and are arranged at an angle, and the part 200 to be counterweighted is located at the connection of the first inclined surface 102 and the second inclined surface 103.

[0040] In some embodiments, the first inclined surface 102 and the second inclined surface 103 of the cavity wall of the inner cavity 101 in the runner counterweight structure provided by the present application are symmetrically arranged with respect to a plane passing through the central axis of the counterweight 1 and perpendicular to the rotation axis of the runner.

[0041] When the unit where the runner is located is operating, the runner rotates. At this time, the centrifugal force of the counterweight 1 is completely transmitted to the connection part between the counterweight 1 and the part 200 to be counterweighted. In the embodiments of the present application, because the first inclined surface 102 and the second inclined surface 103 are symmetrically arranged with respect to a plane passing through the central axis of the counterweight 1 and perpendicular to the rotation axis of the runner, and the plane passing through the central axis of the counterweight 1 and perpendicular to the rotation axis of the runner is the first plane, the centrifugal forces and the reaction forces of the centrifugal forces received by the two parts of the counterweight 1 on both sides of the first plane are the same, avoiding the situation of partial loosening due to different forces on the two parts on both sides of the first plane, solving the problem of easy falling off of the counterweight 1 brought by the existing counterweight method, and improving the use safety of the counterweight.

[0042] Figure 2 is a cross-sectional view of the connection part between the counterweight of the runner counterweight structure provided in the embodiments of the present application and the inner cavity of the runner upper crown, Figure 3 is another perspective view of the cross-section of the connection part between the counterweight of the runner counterweight structure provided in the embodiments of the present application and the inner cavity of the runner upper crown.

[0043] In some embodiments, the counterweight 1 has a first surface 111 facing the portion 200 to be counterweighted, and the edge of the first surface 111 is welded to the first inclined surface 102 and the second inclined surface 103. Refer to Figure 2 and Figure 3 , in the embodiments of the present application, the welding profile of the first surface 111 of the counterweight 1 with the first inclined surface 102 and the second inclined surface 103 is elliptical.

[0044] Figure 4 is a schematic structural diagram of the counterweight provided in the embodiments of the present application. In some embodiments, the counterweight 1 in the runner counterweight structure provided by the present application includes a base counterweight block 11 and a first standard counterweight block 12. The base counterweight block 11 includes a first surface 111, and the first standard counterweight block 12 is detachably connected to the side of the base counterweight block 11 facing away from the first surface 111. Refer to Figure 4 , in the embodiments of the present application, the first standard counterweight block 12 is disposed on the left side of the base counterweight block 11.

[0045] In some embodiments, the counterweight 1 in the runner counterweight structure provided by the present application further includes a second standard counterweight block 13, and the second standard counterweight block 13 is detachably connected between the first standard counterweight block 12 and the base counterweight block 11, or is detachably connected to the side of the first standard counterweight block 12 away from the base counterweight block 11. Refer to Figure 2 , in the embodiments of the present application, the second standard counterweight block 13 is connected to the left side of the first standard counterweight block 12.

[0046] In some embodiments, in order to ensure that the counterweight 1 does not move or rotate during the operation (rotation) of the runner, which may affect the operation of the runner, in an embodiment of the present application, the geometric centers of the base counterweight block 11, the first standard counterweight block 12, and the second standard counterweight block 13 are all located on the central axis of the counterweight 1, effectively avoiding the influence of the counterweight 1 on the operation of the runner, improving the use safety of the counterweight, and thus improving the stability and safety of the runner operation, etc.

[0047] When actually counterweighting the runner, the weights of the counterweight 1 required for different runners are often different. In the related art, usually after calculating the weight of the counterweight 1 required for the runner, a counterweight 1 that meets the weight requirement is produced, and then the counterweight 1 is welded to the first inclined surface 102 of the inner cavity 101 of the upper crown 100. Although this method can meet the counterweight requirement, it is necessary to re-produce the counterweight 1 each time, wasting a lot of time in producing the counterweight 1, and the efficiency is low.

[0048] In the runner counterweight structure provided by the embodiments of the present application, the counterweight body 1 is not a single piece, but includes a basic counterweight block 11 and a first standard counterweight block 12, and / or a second standard counterweight block 13. The weight of the first standard counterweight block 12 is different from the weight of the second standard counterweight block 13. After determining the weight that needs to be counterweighted, the weight of the required counterweight body 1 can be achieved by matching the basic counterweight block 11 with different numbers of the first standard counterweight blocks 12 and / or the second standard counterweight blocks 13. Thus, only the corresponding basic counterweight block 11 needs to be designed and manufactured for different runners. Since the basic counterweight block 11 has a smaller mass and size compared to the integral-structured counterweight body 1, it is more convenient to manufacture.

[0049] Exemplarily, the weight of the first standard counterweight block 12 is 30 kg, and the weight of the second standard counterweight block 13 is 20 kg. When using the runner counterweight structure provided by the present application for counterweighting the runner, after calculating the weight of the counterweight body 1 required for the runner, the weight of the counterweight body 1 can be split. For example, if the weight of the counterweight body 1 required for a certain runner is 67 kg, then it can be split into one 30 kg, one 20 kg, and one 17 kg. In the embodiments of the present application, the weight of the first standard counterweight block 12 is 30 kg, and the weight of the second standard counterweight block 13 is 20 kg. Then the weight of the counterweight body 1 of the runner can be composed of one first standard counterweight block 12 plus one second standard counterweight block 13 and one 17 kg basic counterweight block 11. In addition, in some embodiments, according to the weight of the counterweight body 1 required by the runner, the counterweight body 1 can also only include the basic counterweight block 11 and the second standard counterweight block 13. Of course, the combination method of the first standard counterweight block 12 and the second standard counterweight block 13 in this embodiment is only an example, and other combination methods can also be used. Also, the specific structure of the counterweight body 1 is only an example and does not constitute a limitation to the present application.

[0050] In an embodiment of the present application, the runner counterweight structure further includes a third standard counterweight block, a fourth standard counterweight block, and a fifth standard counterweight block. In the embodiment of the present application, the first standard counterweight block 12, the second standard counterweight block 13, and the above-mentioned third, fourth, and fifth standard counterweight blocks are set as a series of standard counterweight blocks with decreasing weights. For example, the weight of the first standard counterweight block 12 is 30 kg, the weight of the second standard counterweight block 13 is 20 kg, the weight of the third standard counterweight block is 12 kg, the weight of the fourth standard counterweight block is 6 kg, and the weight of the fifth standard counterweight block is 3 kg. There can be multiple standard counterweight blocks of each weight. When counterweighting the runner, different specifications and quantities of standard counterweight blocks can be combined according to actual needs. For example, taking a runner with a counterweight body 1 weighing 79 kg as an example, the weight of its counterweight body 1 can be split into one 30 kg, three 12 kg, and one 13 kg. Then, the weight of the counterweight body 1 of the runner can be composed of one first standard counterweight block 12 plus three third standard counterweight blocks and one 13 kg basic counterweight block 11. Obviously, there are more than one combination way for the weight of this counterweight body 1. For example, it can also be two first standard counterweight blocks 12 plus one fourth standard counterweight block and one 13 kg basic counterweight block 11. It should be noted that in the above two combination ways of standard counterweight blocks, although the weight of the basic counterweight block 11 is greater than the weights of the fourth and fifth standard counterweight blocks, the first standard counterweight block 12 and / or the second standard counterweight block 13 and / or the third standard counterweight block and / or the fourth standard counterweight block and / or the fifth standard counterweight block need to be connected to the basic counterweight block 11. Therefore, the weight of the basic counterweight block 11 should not be designed too small, otherwise there is a possibility of deformation. The present application provides standard counterweight blocks of various different specifications, which can more conveniently match the weight of the counterweight body 1 required by the runner, avoiding the limitation of the specific weight required for counterweight due to insufficient specifications and quantities of standard counterweight blocks. Therefore, various combination ways of a series of standard counterweight blocks provided by the present application can meet different counterweight requirements and improve the versatility of the runner counterweight structure. In addition, when using a series of standard counterweight blocks provided by the embodiment of the present application for counterweight, only the basic counterweight block 11 needs to be produced. Therefore, it can also shorten the production cycle of the counterweight body 1 of the runner and the counterweight time of the runner. Obviously, the specifications, quantities, etc. of the standard counterweight blocks in the above embodiment are all examples and do not constitute a limitation to the present application.

[0051] Exemplarily, the connection manner between the first standard counterweight block 12 and the basic counterweight block 11 in the runner counterweight structure provided by the present application includes bolted connection. The connection manner between the first standard counterweight block 12 and the second standard counterweight block 13 includes bolted connection.

[0052] In this embodiment, the first standard counterweight 12 is connected to the base counterweight 11 by means of a bolted connection, and the second standard counterweight 13 is also connected to the first standard counterweight 12 by means of a bolted connection. In the related art, the connection between the counterweight body 1 and the first inclined surface 102 of the inner cavity 101 mostly uses welding. Compared with welding, the bolted connection method in the embodiment of the present application is not only simple, convenient, and fast in connection, but also more convenient during disassembly. Moreover, when using the connection method in the embodiment of the present application, the weights of the first standard counterweight 12 and the second standard counterweight 13 do not change after disassembly, and the disassembled first standard counterweight 12 and second standard counterweight 13 can be used continuously. For the welding connection method in the related art, the weight of the counterweight body 1 may change after disassembly. If it is desired to use it again, it needs to be processed and reweighed before use. Therefore, it is difficult and time-consuming to reuse it. However, using the rotating wheel counterweight structure provided by the present application can effectively improve the counterweight efficiency and save resources at the same time.

[0053] When designing the counterweight body 1, in order to avoid the counterweight body 1 affecting the operation of the rotating wheel, when fixing the first standard counterweight 12 and the second standard counterweight 13, it is necessary to consider how to set the bolt holes on the first standard counterweight 12, the second standard counterweight 13, and the base counterweight 11, such as the position and quantity of the bolt holes.

[0054] In some embodiments, at least four bolt holes are provided on each of the base counterweight 11, the first standard counterweight 12, and the second standard counterweight 13.

[0055] In some embodiments, the number of bolt holes is an even number, and the bolt holes are symmetrically distributed on both sides of the transverse axis of the first standard counterweight 12 or the second standard counterweight 13 or the base counterweight 11, and the distances between the bolt holes on the same side of the transverse axis are the same. The bolt holes are all away from the transverse axis of the first standard counterweight 12 or the second standard counterweight 13 or the base counterweight 11, and are all spaced a preset distance from the edge of the first standard counterweight 12 or the second standard counterweight 13 or the base counterweight 11. If the number of bolt holes on the same side of the transverse axis is n, where n is an integer and n≥2, when n is an even number, the bolt holes are symmetric about the longitudinal axis of the first standard counterweight 12 or the second standard counterweight 13 or the base counterweight 11. When n is an odd number, the (n + 1) / 2-th bolt hole is located on the longitudinal axis, and the remaining (n - 1) bolt holes are symmetrically arranged about the longitudinal axis.

[0056] In some embodiments, when the total thickness of the first standard counterweight block 12 and / or the second standard counterweight block 13 to be connected is greater than a preset threshold, half of the number of coupling holes are selected for connection. When the unconnected length of the coupling bolts for connecting the first standard counterweight block 12 and / or the second standard counterweight block 13 is less than the thickness of the unconnected first standard counterweight block 12 or the second standard counterweight block 13, the remaining half of the number of coupling holes are used to continue connecting the unconnected first standard counterweight block 12 and / or the second standard counterweight block 13. The selected half of the number of coupling holes are distributed on both sides of the transverse axis. At the same time, two adjacent coupling holes in the direction of the transverse axis are respectively located on both sides of the transverse axis.

[0057] When counterweighting the runner, it may be necessary to connect multiple first standard counterweight blocks 12 and / or second standard counterweight blocks 13 to the basic counterweight block 11. Multiple second standard counterweight blocks 13 may also need to be connected to the first standard counterweight block 12.

[0058] Figure 5 It is a schematic structural view of the first standard counterweight block of a runner counterweight structure provided in an embodiment of the present application. Refer to Figure 5 , in this embodiment, there are four coupling holes, namely g, h, m, and n. Taking the example of connecting six first standard counterweight blocks 12 to the basic counterweight block 11, it should be noted that in order to reduce the time required for counterweighting and save costs at the same time, the coupling bolts in the embodiments of the present application all use common standard coupling bolts and do not need to be customized. Therefore, when connecting the first standard counterweight block 12 to the basic counterweight block 11, if the total thickness of the first standard counterweight block 12 to be connected is greater than the length of the coupling bolt, not all the first standard counterweight blocks 12 to be connected can be connected. Therefore, when the total thickness of the first standard counterweight block 12 to be connected is greater than the length of the coupling bolt, only the two coupling holes g and n are used in the embodiments of the present application to fix the first standard counterweight block 12 (refer to Figure 5) When the remaining length of the coupling bolt is not enough to connect another first standard counterweight 12, the remaining two coupling holes m and h and a new coupling bolt are used to continue connecting the unconnected first standard counterweights 12. In the embodiment of the present application, the two coupling holes g and n, and the two coupling holes m and h are both located on the diagonal of the rectangle formed by the four coupling holes g, h, m, and n. Therefore, the fixing method between the first standard counterweight 12, the second standard counterweight 13, and the basic counterweight 11 provided in the embodiment of the present application can not only fix multiple first standard counterweights 12 and / or second standard counterweights 13, but also achieve the effect of being stable and not easy to fall off. In the above embodiment, taking the connection of the first standard counterweight 12 to the basic counterweight 11 as an example to illustrate the technical effects of the position and quantity of the coupling holes and the connection method provided by the present application is only an example. The position and quantity of the coupling holes in the above embodiment are also applicable to the basic counterweight 11 and the second standard counterweight 13. The above connection method of the coupling holes is also applicable to connecting the second standard counterweight 13 to the basic counterweight 11, and connecting the second standard counterweight 13 to the first standard counterweight 12.

[0059] In some embodiments, the number of coupling holes is odd, and one coupling hole is located at the center point of the first standard counterweight 12 or the second standard counterweight 13 or the basic counterweight 11. The setting method of the remaining coupling holes is the same as when the number of coupling holes is even. Figure 6 is a schematic structural view of the first standard counterweight of another runner counterweight structure provided in the embodiment of the present application. Refer to Figure 6 , in this embodiment, the number of coupling holes is five. The coupling hole k is located at the center point of the first standard counterweight 12. The remaining four coupling holes g, h, m, and n are the same as Figure 5 shown.

[0060] Figure 7 is a schematic structural view of the first standard counterweight of another runner counterweight structure provided in the embodiment of the present application. Refer to Figure 7 , in an embodiment of the present application, six coupling holes are provided on the first standard counterweight 12. These six coupling holes are distributed on both sides of the transverse axis of the first standard counterweight 12, and the distances between the three coupling holes on the same side of the transverse axis are the same. Continue to refer to Figure 7 , in the embodiment of the present application, the second of the three coupling holes on one side of the transverse axis of the first standard counterweight 12 is located on the longitudinal axis of the first standard counterweight 12, and the remaining two coupling holes are symmetric about the longitudinal axis of the first standard counterweight 12.

[0061] In this embodiment, it is still taken as an example that the basic counterweight 11 needs to be connected to six first standard counterweights 12. When the number of mating holes is six, when fixing the first standard counterweight 12 on the basic counterweight 11, three mating holes are selected for connection. These three mating holes need to be distributed on both sides of the transverse axis of the first standard counterweight 12, and two adjacent mating holes in the direction of the transverse axis of the first standard counterweight 12 are located on both sides of the transverse axis. Still refer to Figure 7 , three mating holes a, b, and c can be selected to fix the first standard counterweight 12, or three mating holes d, e, and f can be selected to fix the first standard counterweight 12. In this embodiment, three mating holes a, b, and c are used to fix the first standard counterweight 12. When the remaining length of the mating bolt is not enough to connect another first standard counterweight 12, the remaining three mating holes d, e, and f and a new mating bolt are used to continue connecting the unconnected first standard counterweights 12. In the embodiment of the present application, the three mating holes a, b, and c, and the three mating holes d, e, and f are all located at the three vertices of a triangle. Therefore, the fixing method between the first standard counterweight 12, the second standard counterweight 13, and the basic counterweight 11 provided in the embodiment of the present application can not only fix multiple first standard counterweights 12 and / or second standard counterweights 13, but also achieve the effect of being stable and not easy to fall off. The number and position of the mating holes in the above embodiment are only examples and do not constitute a limitation to the present application.

[0062] In some embodiments, the mating holes opened on the basic counterweight 11 are symmetric about the geometric center of the basic counterweight 11; the mating holes opened on the first standard counterweight 12 are symmetric about the geometric center of the first standard counterweight 12; the mating holes opened on the second standard counterweight 13 are symmetric about the geometric center of the second standard counterweight 13.

[0063] Refer to Figure 5 , in the embodiment of the present application, the mating holes opened on the basic counterweight 11, the first standard counterweight 12, and the second standard counterweight 13 are all symmetric about their respective geometric centers. When the runner runs, the counterweight 1 will not become loose due to the rotation of the runner, and the basic counterweight 11, the first standard counterweight 12, and the second standard counterweight 13 will not loosen from each other, effectively improving the use safety of the counterweight.

[0064] In some embodiments, chamfers 21 are provided on the peripheries of the first standard counterweight 12 and the second standard counterweight 13; the connection method between the first standard counterweight 12 and the second standard counterweight 13 includes welding connection using the chamfers 21. The connection method between the counterweight 1 and the part to be counterweighted 200 includes fillet welding at the periphery.

[0065] In the embodiment of the present application, chamfers 21 are provided at the edges of the first standard counterweight 12 and the second standard counterweight 13. It can be referred toFigure 5 After the first standard counterweight block 12 and the second standard counterweight block 13 are connected by stud bolts, the adjacent counterweight blocks can be welded together by using the bevels 21 opened around the first standard counterweight block 12 and the second standard counterweight block 13. This connection method is suitable for scenarios with relatively high requirements for the connection strength between the counterweight body 1 and the inner cavity wall of the upper crown 100. In addition, the welding method between the first standard counterweight block 12 and the second standard counterweight block 13 and the welding method between the basic counterweight block 11 and the part to be counterweighted 200 can both adopt the peripheral fillet welding method.

[0066] In some embodiments, the thickness of the first standard counterweight block 12 and the second standard counterweight block 13 is 20 - 30 mm, and the length of the first standard counterweight block 12 and the second standard counterweight block 13 is 300 - 500 mm.

[0067] When designing the first standard counterweight block 12 and the second standard counterweight block 13, not only the weight but also the dimensions, that is, the thickness and width, as well as the shape need to be considered. In the embodiments of the present application, the first standard counterweight block 12 and the second standard counterweight block 13 are designed as octagons (see Figure 5 ), the thickness is designed to be 20 - 30 mm, and the length is designed to be 300 - 500 mm. Designing the thickness to be 20 - 30 mm is convenient for making full use of the stud bolts to connect the first standard counterweight block 12 and / or the second standard counterweight block 13, which can enable a stud bolt to connect as many first standard counterweight blocks 12 and / or second standard counterweight blocks 13 as possible. At the same time, a thickness of 20 - 30 mm can also avoid deformation. The length is close to the size of the basic counterweight block 11, which is convenient for better opening of the stud holes and further facilitating the subsequent connection of the first standard counterweight block 12 and / or the second standard counterweight block 13.

[0068] On the other hand, the present application also provides a water turbine, which includes the above-mentioned runner counterweight structure.

[0069] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above, and details will not be repeated here.

[0070] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to the present application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to the present application. Such modifications, improvements, and corrections are proposed in the present application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of the present application.

[0071] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0072] Similarly, it should be noted that, in order to simplify the description of this application disclosure and thus help the understanding of one or more invention embodiments, in the previous description of the embodiments of this application, sometimes multiple features are grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiment are fewer than all the features of the single embodiment disclosed above.

[0073] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used for the description of embodiments are, in some examples, modified by the modifiers "about", "approximately", or "substantially". Unless otherwise stated, "about", "approximately", or "substantially" indicate that the said numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and this approximate value can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used in some embodiments of this application to confirm the breadth of their scope are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0074] The above has introduced in detail a counterweight structure provided by the embodiments of this application. Specific examples are used herein to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those skilled in the art, based on the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A runner counterweight structure, applied to a water turbine, characterized in that: include: A rotating wheel, the rotating wheel comprising an upper crown, the upper crown having an inner cavity, the cavity wall of the inner cavity having a portion to be weighted away from the rotation axis of the rotating wheel; A counterweight body is arranged on the part to be counterweighted, and the central axis of the counterweight body is perpendicular to the rotation axis of the rotating wheel.

2. The wheel counterweight structure according to claim 1, characterized in that: The portion to be weighted is located at the farthest end of the cavity wall of the inner cavity relative to the rotation axis of the rotating wheel.

3. The wheel counterweight structure according to claim 2, characterized in that: The cavity wall of the inner cavity comprises a first inclined surface and a second inclined surface which are inclined relative to the rotation axis of the rotating wheel and are arranged at an angle, and the portion to be weighted is located at the connection between the first inclined surface and the second inclined surface.

4. The wheel counterweight structure according to claim 3, characterized in that: The first inclined surface and the second inclined surface have a smooth transition at a connection point between them.

5. The wheel counterweight structure according to claim 3, characterized in that: The counterweight body has a first surface facing the portion to be counterweighted, and an edge of the first surface is welded to the first inclined surface and the second inclined surface.

6. The wheel counterweight structure according to claim 3, characterized in that: The first inclined surface and the second inclined surface are symmetrically arranged relative to a plane passing through the central axis of the counterweight body and perpendicular to the rotation axis of the rotating wheel.

7. The wheel counterweight structure according to claim 5, characterized in that: The counterweight body includes: a basic counterweight block, comprising said first surface; The first standard counterweight block is detachably connected to a side of the basic counterweight block facing away from the first surface.

8. The wheel counterweight structure according to claim 7, characterized in that: The counterweight body also includes: The second standard counterweight block is detachably connected between the first standard counterweight block and the basic counterweight block, or is detachably connected to a side of the first standard counterweight block away from the basic counterweight block; and / or the geometric center of the basic counterweight block, the geometric center of the first standard counterweight block and the geometric center of the second standard counterweight block are all located on the central axis of the counterweight body; and / or the weight of the first standard counterweight block is different from the weight of the second standard counterweight block.

9. The wheel counterweight structure according to claim 8, characterized in that: The basic counterweight block, the first standard counterweight block and the second standard counterweight block are each provided with at least four engagement holes.

10. A water turbine, characterized in that: It comprises the rotating wheel counterweight structure as claimed in any one of claims 1 to 9.

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