A telescoping slot wedge, a generator set and a method of use

Abstract

The present application relates to the technical field of generator, in particular to a telescopic slot wedge, a generator set and a use method.A telescopic slot wedge, comprising: a shell provided with a containing space, a top plate of the shell is provided with a connecting hole corresponding to the containing space; a slot wedge structure is arranged in the containing space, the slot wedge structure comprises a dove tail end adapted to extend on both sides of the shell respectively, a containing gap is left between two oppositely arranged dove tail ends, the two dove tail ends are connected through a springback piece, the dove tail end is adapted to be fitted with a dove tail groove of an iron core; a force applying piece is arranged in the connecting hole, the bottom of the force applying piece is arranged in the containing gap.The present application solves the problem that the slot wedge and the slot are loose, the slot wedge on a certain straight line in the axial direction of the stator is knocked down block by block along the axial direction by the maintenance personnel during maintenance, the problem of large workload and long time consumption in the process of removal is solved, thereby providing a telescopic slot wedge, a generator set and a use method.

Description

Technical Field

[0001] This invention relates to the field of generator technology, specifically to a telescopic slot wedge, a generator set, and a method of using it. Background Technology

[0002] The stator is the stationary part of the motor, consisting of three parts: the iron core, the stator windings, and the base. To reduce hysteresis and eddy current losses in the iron core, it is usually made of high-quality cold-rolled silicon steel sheets. The sheets are stamped with lower slots for embedding the coils and dovetail slots for placing slot wedges. The slot wedges are components that tightly fix the coils in the lower slots, and the slot wedges are connected to the slot openings by corrugated plates.

[0003] In generator sets, variable-speed generator motors and doubly-fed generators with salient-pole rotor structures, like the stator structure, also require slot wedges for fixation. After long-term operation, especially with large generators, slot wedges are prone to loosening due to thermal expansion and contraction of the spacers and corrugated plates, as well as material fatigue. Loose slot wedges can cause spark discharge in the stator bars, leading to electrolytic corrosion, and in severe cases, damage to the stator insulation or even a generator short circuit.

[0004] Existing slot wedges are often single, straight strips for fixation, secured by a mechanical connection between the wedge and the slot opening. Due to the lifespan of the corrugated plates and gaskets, they tend to loosen periodically. Once loosening occurs, maintenance is required, necessitating the repair team to modify or replace the loose wedges and gaskets associated with the unit. Both of these methods require removing the slot wedges piece by piece along a straight line along the stator's axial direction, resulting in a labor-intensive and time-consuming process. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art after the slot wedge and slot opening loosen. The maintenance personnel have to knock off the slot wedge piece by piece along a straight line on the stator axis, which is a lot of work and time-consuming in the dismantling process. Therefore, the present invention provides a telescopic slot wedge, generator set and usage method.

[0006] To address the above problems, the present invention provides a telescopic groove wedge, comprising:

[0007] The housing has a receiving space, and the top plate of the housing has a connection hole corresponding to the receiving space;

[0008] A slotted wedge structure is provided within the accommodating space. The slotted wedge structure includes a dovetail end adapted to extend from both sides of the housing, with an accommodating gap between the two oppositely arranged dovetail ends. The two dovetail ends are connected by a spring-loaded member, and the dovetail ends are adapted to fit into the dovetail groove of the iron core.

[0009] A force-applying component is inserted into the connecting hole, and the bottom of the force-applying component is located within the receiving gap.

[0010] Optionally, the shell is elongated, and the shell has a receiving space in the lateral direction. The number of slotted wedge structures corresponds one-to-one with the number of receiving spaces.

[0011] Optionally, each of the slotted wedge structures further includes two slotted wedge blocks, each of the slotted wedge blocks having a dovetail end, and the spring-loaded member being disposed between the two slotted wedge blocks.

[0012] Optionally, each slotted wedge is provided with a groove, which is either a quarter-sphere or a semi-conical shape.

[0013] Optionally, a limiting strip is provided on the side wall of the accommodating space along the length direction, and the limiting strip is in contact with the surface of the groove wedge block.

[0014] Optionally, the grooved wedge is integrally formed with the pigeon's tail end.

[0015] Optionally, the top plate has heat dissipation fins on the surface away from the receiving space, and heat dissipation vents are provided between the outer walls of adjacent receiving spaces, with the heat dissipation vents corresponding to the ventilation slots of the iron core.

[0016] A generator set further includes an iron core, the iron core having a dovetail groove, the dovetail end being adapted to the dovetail groove, and a corrugated plate being attached to the bottom surface of the groove wedge block away from the shell.

[0017] A method of using a telescopic groove wedge includes the following steps: when in a disassembled state, the force-applying member is moved upward, the force-applying member moves away from the receiving space to leave the receiving gap between the pigeon tail ends, and the rebound member provides elastic force to drive the pigeon tail ends toward the housing, so that the pigeon tail groove is separated from the pigeon tail ends.

[0018] Optionally, the following steps are included:

[0019] In the installed state, the force-applying component slowly moves toward the receiving space, and through contact with the groove, it drives the pigeon tail end to move away from the shell.

[0020] In the applied force state, the force-applying component is located within the accommodating gap so that the pigeon tail end fits into the pigeon tail groove.

[0021] The technical solution of this invention has the following advantages:

[0022] 1. The telescopic slotted wedge provided by this invention comprises a housing with a receiving space, and a connecting hole corresponding to the receiving space on the top plate of the housing; a slotted wedge structure disposed within the receiving space, the slotted wedge structure including a dovetail end adapted to extend from both sides of the housing respectively, a receiving gap between the two opposing dovetail ends, the two dovetail ends being connected by a spring-loaded component, and the dovetail ends being adapted to fit against the dovetail groove of the iron core; and a force-applying component, which passes through the connecting hole, with its bottom disposed within the receiving gap. When in the disassembly state, the force-applying component is moved upwards, moving away from the receiving space to move away from the receiving gap between the dovetail ends. The spring-loaded component provides elastic force to drive the dovetail ends toward the housing, separating the dovetail groove from the dovetail ends. By moving the force-applying component, the spring-loaded component provides elastic force to automatically drive the dovetail ends toward the housing, which has the advantage of convenient disassembly. During maintenance, any loosening can be repaired or replaced, and the corresponding housing and slotted wedge structure within the receiving space can be replaced. It eliminates the need for manual hammering to disengage the pigeon tail from the pigeon tail groove, and also eliminates the need to remove all the slot wedges along a straight line on the stator axis, effectively improving the efficiency of on-site inspection and maintenance.

[0023] 2. The telescopic groove wedge provided by the present invention has a long strip-shaped shell with a receiving space in the transverse direction of the shell. The number of groove wedge structures corresponds one-to-one with the number of receiving spaces, so that a number of groove wedge structures are set along the length direction of the shell. During maintenance, if any loosening occurs, the corresponding groove wedge structure in the shell and the receiving space can be repaired or replaced.

[0024] 3. The telescopic groove wedge provided by the present invention includes two groove wedge blocks in each groove wedge structure. Each groove wedge block is provided with a pigeon tail end. A spring-loaded component is provided between the two groove wedge blocks. The groove wedge blocks are used to connect with the pigeon tail end and the spring-loaded component respectively. The groove wedge blocks and the pigeon tail end are integrally formed for easy processing.

[0025] 4. The telescopic groove wedge provided by the present invention has a groove in each groove wedge block. The cross-section of the groove is hemispherical or semi-conical. Due to the different cross-sections of the grooves, the movement of the force-applying component can achieve the purpose of driving the groove wedge block and the pigeon tail end to move relative to the shell.

[0026] 5. The telescopic groove wedge provided by the present invention has a limiting strip on the side wall along the length direction of the accommodating space. The limiting strip is in contact with the surface of the groove wedge block to limit the groove wedge block and prevent the groove wedge block from moving up and down along the height direction of the shell.

[0027] 6. The telescopic slot wedge provided by this invention has heat dissipation fins on the surface of the top plate facing away from the receiving space. The heat dissipation fins increase the convective heat transfer capacity of the outer surface of the shell, allowing the heat of the slot wedge structure to be quickly transferred to the shell and then dissipated by the heat dissipation fins. Heat dissipation vents are provided between the outer walls of adjacent receiving spaces. The heat dissipation vents are arranged corresponding to the ventilation slots of the iron core to increase the cooling air inlet area of ​​the iron core ventilation channel and improve the heat dissipation effect of the iron core and windings.

[0028] 7. The generator set provided by the present invention further includes an iron core, the iron core is provided with a pigeon tail groove, the pigeon tail groove is adapted to the pigeon tail end so that the pigeon tail groove fixes the pigeon tail end, and a corrugated plate is attached to the bottom surface of the groove wedge block away from the shell, and the groove wedge block exerts a squeezing effect on the corrugated plate. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the telescopic groove wedge provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the connection between the slotted wedge structure and the shell provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the housing provided in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the slotted wedge structure in a disassembled state according to an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the groove wedge structure under applied force in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Connecting hole; 2. Housing; 3. Heat dissipation vent; 4. Heat dissipation fins; 5. Limiting strip; 6. Accommodating space; 7. Slot wedge block; 8. Groove; 9. Dovetail end; 10. Rebound component; 11. Force-applying component; 12. Slot wedge structure; 13. Accommodating gap. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] like Figure 1 - Figure 2 One specific embodiment of the telescopic slotted wedge shown includes: a housing 2, which is elongated and has three spaced-apart receiving spaces 6 arranged laterally, with each receiving space 6 extending through the housing 2 in the lateral direction. The top plate of the housing 2 has connecting holes 1 corresponding to the receiving spaces 6; that is, one connecting hole 1 corresponds to one receiving space 6, and each connecting hole 1 has an internal thread. Figure 1 , Figure 2 and Figure 3 As shown, four heat dissipation fins 4 are provided on the surface of the top plate opposite to the receiving space 6; that is, two heat dissipation fins 4 are provided on each side of the top plate. Heat dissipation openings 3 are provided between the outer walls of adjacent receiving spaces 6, and the heat dissipation openings 3 are corresponding to the ventilation slots of the iron core, and the heat dissipation openings 3 and ventilation slots are of the same size. Figure 3As shown, a limiting strip 5 is provided on the side wall of the accommodating space 6 along the length direction, and the limiting strip 5 is in contact with the surface of the groove wedge block 7.

[0042] As an alternative implementation, the number of accommodating spaces 6 on the same housing 2 can also be 1, 2, 4 or 5.

[0043] As an alternative implementation, the heat dissipation fins 4 on one side of the top plate can have one, three, four or even more.

[0044] The slotted wedge structure 12 is located within the receiving space 6 and is arranged in a one-to-one correspondence with the receiving space 6. For example... Figure 4 , Figure 5 As shown, each slotted wedge structure 12 includes two opposing slotted wedge blocks 7, with two spring-loaded members 10 positioned between the two slotted wedge blocks 7, and a receiving gap 13 between the two slotted wedge blocks 7. Each slotted wedge block 7 has a dovetail end 9 at its end opposite to the spring-loaded member 10, the curvature of which is equal to the dovetail groove of the iron core to ensure a proper fit and fixation. Specifically, the spring-loaded member 10 is a spring. For ease of manufacturing, one slotted wedge block 7 and one dovetail end 9 are integrally formed. Figure 4 , Figure 5 As shown, each slot wedge 7 is provided with a groove 8. The groove 8 is in the shape of a quarter sphere. That is, when two opposite slot wedges 7 are fitted together, the two grooves 8 form a hemispherical groove. The slot wedge 7 is fitted with a corrugated plate away from the bottom surface of the housing 2. The slot wedge 7 exerts a squeezing effect on the corrugated plate.

[0045] As an alternative implementation, the groove 8 can also be in other shapes such as a semi-conical shape.

[0046] As an alternative implementation, the spring element 10 can also be a rubber rod, a cylinder, etc.

[0047] As an alternative implementation, the number of spring-loaded components 10 can also be 1, 3 or even more.

[0048] The force-applying component 11 is connected to the connecting hole 1 by a threaded rotation. The force-applying component 11 includes a rotating rod and a nut. Specifically, the force-applying component 11 is a screw. It should be noted that half the diameter of the lower end of the force-applying component 11 minus half the length of the spring-loaded component 10 in its normal state equals the length of the dovetail end 9. The height of the rotating rod of the force-applying component 11 is greater than the sum of the height of the receiving space 6 and the height of the top plate, so that after the lower end of the rotating rod of the force-applying component 11 enters the receiving gap 13, the lower end of the force-applying component 11 contacts the corrugated plate and further strengthens the compression effect.

[0049] As an alternative implementation, the force-applying member 11 and the connecting hole 1 can also be fixedly connected by means of snap-fit ​​or other methods.

[0050] Example 2

[0051] A generator set includes: a housing 2, a slotted wedge structure 12, a force-applying component 11, and an iron core, wherein the iron core is provided with a pigeon tail groove, which is adapted to the pigeon tail end 9.

[0052] A method for using a telescopic slotted wedge includes the following steps:

[0053] 1) In the installation state, the force-applying component 11 slowly moves towards the receiving space 6, and through contact with the groove 8, it drives the pigeon tail end 9 to move away from the shell 2, and the spring component 10 slowly changes from the natural state to the stressed tension state.

[0054] 2) Under the applied force state, the applied force member 11 is fixed relative to the housing 2, and the lower end of the applied force member 11 is located in the accommodating gap 13, and the spring member 10 is in the stretched state so that the pigeon tail end 9 fits into the pigeon tail groove.

[0055] 3) In the disassembled state, the force-applying component 11 is moved upward, and the force-applying component 11 moves away from the receiving space 6 to leave the receiving gap 13 between the pigeon tail end 9. The rebound component 10 provides elastic force to drive the pigeon tail end 9 toward the housing 2, so that the pigeon tail groove is separated from the pigeon tail end 9.

[0056] The telescopic slot wedge provided by the present invention has the following advantages: (1) By rotating the force-applying member 11 relative to the housing 2, maintenance of the generator set only requires replacement of the slot wedges in the loose parts, without replacing all the slot wedges along a straight line along the stator axis, reducing the damage caused by maintenance and effectively improving maintenance efficiency; (2) The lower end of the force-applying member 11 and the slot wedge block 7 form a local compression on the corrugated plate; (3) The corresponding setting of the heat dissipation port 3 and the iron core ventilation slot increases the inlet area of ​​the cooling air in the iron core ventilation channel and improves the heat dissipation effect of the iron core; (4) The heat dissipation fins 4 increase the convective heat transfer capacity of the top plate surface; (5) The slot wedge block 7 has a gap between the surface facing the housing 2 and the inner wall of the housing 2, increasing the air flow channel.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A telescoping slot wedge characterized by, It includes: The shell (2) is provided with a containing space (6), and the top plate of the shell (2) is provided with a connecting hole (1) corresponding to the containing space (6); The slot wedge structure is arranged in the containing space (6), and the slot wedge structure includes a dove tail end (9) suitable for extending on both sides of the shell (2) respectively, a containing gap (13) is left between the two oppositely arranged dove tail ends (9), and the two dove tail ends (9) are connected through a resilient member (10), and the dove tail end (9) is suitable for being matched with the dove tail groove of the iron core; The force applying member (11) is arranged in the connecting hole (1), and the bottom of the force applying member (11) is arranged in the containing gap (13); The shell (2) is long strip-shaped, the containing space (6) is arranged in the transverse direction of the shell (2), and the slot wedge structure (12) is arranged in one-to-one correspondence with the containing space (6); Each slot wedge structure (12) further includes two slot wedge blocks (7), each slot wedge block (7) is provided with a dove tail end (9), and the resilient member (10) is arranged between the two slot wedge blocks (7); Each slot wedge block (7) is provided with a groove (8), and the groove (8) is a quarter spherical or half conical.

2. The telescoping slot wedge of claim 1, wherein, A limiting strip (5) is arranged on the side wall of the containing space (6) in the length direction, and the limiting strip (5) is matched with the surface of the slot wedge block (7).

3. The telescoping slot wedge of claim 1, wherein, The slot wedge block (7) and the dove tail end (9) are integrally formed.

4. The telescoping slot wedge of claim 2, wherein, The surface of the top plate away from the containing space (6) is provided with a heat dissipation fin (4), the outer walls of adjacent containing spaces (6) are provided with heat dissipation openings (3), and the heat dissipation openings (3) are arranged in correspondence with the ventilation slots of the iron core.

5. A generator set characterized by, The telescopic slot wedge of any one of claims 1-4 further includes an iron core, the iron core is provided with a dove tail groove, the dove tail end (9) is matched with the dove tail groove, and the surface of the slot wedge block (7) away from the bottom of the shell (2) is matched with a corrugated plate.

6. A method of using a telescoping slot wedge for use with the telescoping slot wedge of claim 1, wherein, It includes the following steps: When in the disassembled state, the force applying member (11) is moved upward, the force applying member (11) moves away from the containing space (6) to leave the containing gap (13) between the dove tail ends (9), and the resilient member (10) provides elastic force to drive the dove tail end (9) to move towards the shell (2), so that the dove tail groove is separated from the dove tail end (9).

7. The method of using a telescoping slot wedge of claim 6, wherein, It includes the following steps: In the installed state, the force applying member (11) slowly moves towards the containing space (6), and the dove tail end (9) is driven to move away from the shell (2) through contact with the groove (8); In the force applying state, the force applying member (11) is located in the containing gap (13), so that the dove tail end (9) is matched with the dove tail groove.

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