Generator stator core press-fitting device

Abstract

The utility model relates to a generator stator core press-fitting device. The generator stator iron core press-fitting device comprises a stator machine base, a lower tooth pressing plate, a lower pressing plate, a pre-pressing mechanism, an upper pressing plate, a pre-pressing pull rod assembly and an adjusting bolt. When the press fitting of the next section of stator iron core is carried out after the press fitting of the previous section of stator iron core is completed, only the connection between the upper pressing plate and the pre-pressing pull rod assembly needs to be disassembled, and the lower pressing plate, the pre-pressing mechanism and the upper pressing plate are taken out, so that the operation is simple and convenient. When the pre-pressing mechanism is used for applying downward pressing force to the lower pressing plate, the adjusting bolt is matched with the pre-pressing pull rod assembly and the pre-pressing mechanism to form a lever structure together with the upper pressing plate, so that the press-fitting flatness of the upper pressing plate can be adjusted according to the lever principle, and the flatness of a press-fitting iron core is improved; and the probability of sideslip of the silicon steel sheet when the pre-pressing height is very high is greatly reduced, and the press-fitting quality is greatly ensured. Therefore, the press-fitting device for the stator core of the generator has relatively high operation convenience and relatively high press-fitting quality.

Description

Technical Field

[0001] The utility model relates to the technical field of generator processing, in particular to a device for pressing a stator core of a generator. Background Art

[0002] The stator core is an important component of a hydro-generator. It is the main part of the magnetic circuit. The stator core is generally formed by stacking 0.5-mm thick sector-shaped sheets layer by layer, and is pressed and integrated by a threaded tie rod assembly and a tooth pressing plate. During operation, it is subjected to the combined action of electromagnetic force, thermal stress, and mechanical force. To ensure the pressing quality of the stator core and avoid loosening and increasing losses, the stacking factor is generally not less than 0.96.

[0003] However, in order to ensure the flatness of the pressing surface of the pre-pressing structure, the entire pressing device needs to be structurally stable during the pre-pressing process. The traditional device for pressing a stator core of a generator will increase the fixed points between the pre-pressing structure and the stator frame of the generator, which will cause complicated operation and affect the pressing efficiency. If the fixed points between the pre-pressing structure and the stator frame of the generator are reduced to simplify the operation, the flatness of the pressing surface of the pre-pressing structure in the traditional device for pressing a stator core of a generator cannot be guaranteed, resulting in an increase in the probability of side slip of the silicon steel sheets as the pre-pressing height increases, thereby affecting the pressing quality. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a device for pressing a stator core of a generator that can balance high pressing quality and high operation convenience.

[0005] A device for pressing a stator core of a generator, comprising:

[0006] A stator frame;

[0007] A lower tooth pressing plate, placed on the lower ring plate of the stator frame;

[0008] A lower pressing plate, parallel to and spaced from the lower tooth pressing plate;

[0009] A pre-pressing mechanism, placed on the lower pressing plate;

[0010] An upper pressing plate, placed on the pre-pressing mechanism; adjustment screw holes and locking through holes are spacedly arranged on the upper pressing plate; the adjustment screw holes are located outside the locking through holes;

[0011] A pre-pressing tie rod assembly, with both ends detachably locked to the locking through holes and the tensioning through holes of the lower ring plate respectively;

[0012] An adjustment bolt, with one end screwed into the adjustment screw hole and the other end abutted against the lower ring plate, the middle layer ring plate or the upper ring plate of the stator frame;

[0013] Wherein, the length of the preloading mechanism in the height direction is adjustable to adjust the distance between the lower pressing plate and the lower toothed pressing plate, and is used to apply a preset downward pressure to the lower pressing plate.

[0014] In one embodiment, the upper pressing plate includes a plurality of upper pressing sub-plates that are arranged at intervals along the circumferential direction and are fan-shaped; the locking through holes and the adjustment screw holes are arranged at intervals on each of the upper pressing sub-plates;

[0015] The lower pressing plate includes a plurality of lower pressing sub-plates that are arranged at intervals along the circumferential direction and are fan-shaped; the number of the lower pressing sub-plates is the same as that of the upper pressing sub-plates and they correspond one by one; at least one preloading mechanism is placed on each of the lower pressing plates;

[0016] The number of the preloading tie rod assemblies is the same as that of the locking through holes and they correspond one by one; the two ends of the preloading tie rod are respectively detachably locked to the corresponding locking through hole and the corresponding tension through hole on the lower ring plate.

[0017] In one embodiment, a plurality of the preloading mechanisms are placed on each of the lower pressing plates, and the plurality of preloading mechanisms are evenly distributed in the middle of the lower pressing plate.

[0018] In one embodiment, the preloading tie rod assembly includes a preloading screw, two preloading nuts and two preloading washers; the two ends of the preloading screw respectively pass through the corresponding locking through hole and the corresponding tension through hole on the lower ring plate; the two preloading washers are respectively sleeved on the two ends of the preloading screw; the two preloading nuts are respectively screwed on the two ends of the preloading screw to press the two preloading washers on the upper surface of the upper pressing plate and the lower surface of the lower ring plate respectively.

[0019] In one embodiment, a preloading tube is further included; the preloading tube is sleeved on the preloading mechanism or the preloading screw;

[0020] When the preloading tube is sleeved on the preloading mechanism, the preloading tube is vertically placed on the lower pressing plate; when the preloading tube is sleeved on the preloading screw, the preloading tube is pressed by the preloading nut on the lower surface of the lower ring plate or the upper surface of the upper pressing plate.

[0021] In one embodiment, the preloading tie rod assembly includes a first tie rod and a second tie rod; the length of the first tie rod is greater than that of the second tie rod; the two ends of the first tie rod or the second tie rod are respectively locked to the upper pressing plate and the lower ring plate.

[0022] In one embodiment, the preloading mechanism is a mechanical jack.

[0023] In one embodiment, a plurality of first avoidance notches are formed at intervals along the circumferential direction on the outer edge portion of the upper pressing plate; the first avoidance notches are used to avoid the positioning ribs or rib plates on the stator frame; a plurality of second avoidance notches are formed at intervals along the circumferential direction on the outer portion of the lower pressing plate; the second avoidance notches are used to avoid the positioning ribs or rib plates on the stator frame.

[0024] For the above generator stator core pressing device, when pressing the next section of the stator core after the previous section of the stator core pressing is completed, only the connection between the upper pressing plate and the pre-pressing pull rod assembly needs to be disassembled, and the lower pressing plate, the pre-pressing mechanism and the upper pressing plate can be taken and placed. The operation is simple and convenient. At the same time, when the pre-pressing mechanism applies a downward pressure to the lower pressing plate, the adjusting bolts that abut against the lower ring plate, the intermediate ring plate or the upper ring plate of the stator frame cooperate with the pre-pressing pull rod assembly and the pre-pressing mechanism, and together with the upper pressing plate, form a lever structure, so that the flatness of the pressing plane of the upper pressing plate can be adjusted by using the lever principle, so as to improve the flatness of the pressed core, and greatly reduce the probability of the silicon steel sheet slipping laterally when the pre-pressing height is very high, and greatly ensure the pressing quality. Therefore, the above generator stator core pressing device has both high operation simplicity and high pressing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the generator stator core pressing device in a preferred embodiment of the present invention;

[0026] Figure 2 is Figure 1 a top view of the positional relationship between the upper pressing plate and the lower pressing plate in the shown generator stator core pressing device.

[0027] Reference numerals: 100, stator core pressing device; 110, stator frame; 111, lower ring plate; 112, intermediate ring plate; 113, upper ring plate; 120, lower tooth pressing plate; 130, lower pressing plate; 131, lower sub-plate; 132, second avoidance notch; 140, pre-pressing mechanism; 150, upper pressing plate; 151, adjusting screw hole; 152, locking through hole; 153, upper sub-plate; 154, first avoidance notch; 160, pre-pressing pull rod assembly; 161, pre-pressing screw; 162, pre-pressing gasket; 163, pre-pressing nut; 170, adjusting bolt; 20, silicon steel sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model in this specification are only for the purpose of describing specific embodiments, and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can also be intermediate elements. It can also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can also be one or more intermediate elements.

[0031] In the case of using "comprising", "having", and "including" described herein, unless explicit limiting terms are used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be understood as having a quantity of one.

[0032] In addition, the drawings are not drawn to a 1:1 scale, and the relative dimensions of each element are only drawn by way of example in the drawings and not necessarily to the actual scale.

[0033] Please refer to Figure 1 , the generator stator core press-fitting device 100 in the preferred embodiment of this utility model includes a stator frame 110, a lower tooth pressing plate 120, a lower pressing plate 130, a pre-pressing mechanism 140, an upper pressing plate 150, a pre-pressing pull rod assembly 160, and an adjusting bolt 170.

[0034] Please also refer to Figure 2 , the lower tooth pressing plate 120 is placed on the lower ring plate 111 of the stator frame 110. The lower pressing plate 130 is parallel to and spaced from the lower tooth pressing plate 120. The pre-pressing mechanism 140 is placed on the lower pressing plate 130. The upper pressing plate 150 is placed on the pre-pressing mechanism 140. The upper pressing plate 150 is provided with adjusting screw holes 151 and locking through holes 152 at intervals. The adjusting screw holes 151 are located outside the locking through holes 152.

[0035] It should be noted that the outside of the locking through hole 152 refers to the position on the diameter direction of the stator frame 110, on the side of the locking through hole 152 away from the central axis of the stator frame 110.

[0036] Both ends of the preloading tie rod assembly 160 are detachably locked with the locking through holes 152 and the tensioning through holes of the lower ring plate 111 respectively. One end of the adjusting bolt 170 is screwed into the adjusting screw hole 151, and the other end abuts against the lower ring plate 111, the middle layer ring plate 112 or the upper ring plate 113 of the stator frame 110.

[0037] Among them, the length of the preloading mechanism 140 in the height direction is adjustable to adjust the distance between the lower pressing plate 130 and the lower tooth pressing plate 120, and is used to apply a downward preset pressure to the lower pressing plate 130. Specifically, the preloading mechanism 140 is a mechanical jack. Of course, in other embodiments, the preloading mechanism 140 can also be a suction cup type labor-saving wrench, an electric strut and other structures.

[0038] During use, after the previous stator core segment is press-fitted, the locking connection between the upper pressing plate 150 and the preloading tie rod assembly 160 can be disassembled, and then the preloading mechanism 140 and the lower pressing plate 130 are taken off in sequence. Then, a plurality of silicon steel sheets 20 are stacked on the previously preloaded stator core segment from bottom to top in sequence. Then, the lower pressing plate 130, the preloading mechanism 140 and the upper pressing plate 150 are stacked on the plurality of silicon steel sheets 20 in sequence from bottom to top. Then, the end of the preloading tie rod assembly 160 far from the lower ring plate 111 is locked with the upper pressing plate 150, and by turning the adjusting bolt 170, the adjusting bolt 170 is abutted against the lower ring plate 111, the middle layer ring plate 112 or the upper ring plate 113 of the stator core, and then a downward pressure is applied to the lower pressing plate 130 through the preloading mechanism 140 to press the plurality of silicon steel sheets 20 to a preset height, so as to realize the preloading work of this stator core segment.

[0039] For the above generator stator core press-fitting device 100, when the next stator core segment is press-fitted after the previous stator core segment is press-fitted, only the connection between the upper pressing plate 150 and the preloading tie rod assembly 160 needs to be disassembled, and the lower pressing plate 130, the preloading mechanism 140 and the upper pressing plate 150 are taken and placed. The operation is simple and convenient. At the same time, when the preloading mechanism 140 applies a downward pressure to the lower pressing plate 130, the adjusting bolt 170 abutted against the lower ring plate 111, the middle layer ring plate 112 or the upper ring plate 113 of the stator frame 110 cooperates with the preloading tie rod assembly 160 and the preloading mechanism 140 to form a lever structure with the upper pressing plate 150, so that the flatness of the press-fitting plane of the upper pressing plate 150 can be adjusted by using the lever principle, so as to improve the flatness of the press-fitted core, and greatly reduce the probability of side slip of the silicon steel sheets 20 when the preloading height is very high, and greatly ensure the press-fitting quality. Therefore, the above generator stator core press-fitting device 100 has both high operation simplicity and high press-fitting quality.

[0040] In some embodiments, the upper pressing plate 150 includes a plurality of upper pressing sub - plates 153 that are arranged at intervals along the circumferential direction and are fan - shaped. Locking through - holes 152 and adjusting screw holes 151 are spaced apart on each upper pressing sub - plate 153.

[0041] The lower pressing plate 130 includes a plurality of lower pressing sub - plates 131 that are arranged at intervals along the circumferential direction and are fan - shaped. The number of lower pressing sub - plates 131 is the same as that of the upper pressing sub - plates 153 and they correspond one by one. At least one pre - pressing mechanism 140 is placed on each lower pressing plate 130.

[0042] The number of pre - pressing pull - rod assemblies 160 is the same as the number of locking through - holes 152 and they correspond one by one. The two ends of the pre - pressing pull - rod are detachably locked with the corresponding locking through - holes 152 and the corresponding tensioning through - holes on the lower ring plate 111 respectively.

[0043] Each upper pressing sub - plate 153 is provided with a pre - pressing pull - rod assembly 160 and an adjusting bolt 170. Therefore, each upper pressing sub - plate 153, the pre - pressing pull - rod assembly 160 and the adjusting bolt 170 thereon, and the pre - pressing mechanism 140 below the upper pressing sub - plate 153 together form an independent lever structure. Thus, the flatness of the pressing surface of each upper pressing sub - plate 153 is adjusted by using the lever principle. That is, during the pressing process of the stator core, in the circumferential direction of the stator core, the flatness of the pressing surface of the respective upper pressing plates 150 can be adjusted by using multiple independent lever structures, realizing multi - segment independent adjustment of the flatness of the upper pressing plate 150 and also multi - segment adjustment of the flatness of the pressed core, further reducing the probability of the silicon steel sheet 20 slipping sideways when the pre - pressing height is very high, and further improving the quality stability of the stator core pressing.

[0044] Further, in some embodiments, a plurality of pre - pressing mechanisms 140 are placed on each lower pressing plate 130, and the plurality of pre - pressing mechanisms 140 are evenly distributed in the middle of the lower pressing plate 130. Specifically, two to three pre - pressing mechanisms 140 are placed at intervals along the circumferential direction of the stator frame 110 on each lower pressing plate 130.

[0045] A plurality of pre - pressing mechanisms 140 are placed between each lower pressing sub - plate 131 and the corresponding upper pressing sub - plate 153, and the plurality of pre - pressing mechanisms 140 are evenly distributed in the middle of the lower pressing sub - plate 131. When the pre - pressing mechanism 140 exerts a downward pressure on the lower pressing sub - plate 131, it is ensured that the middle parts of the lower pressing sub - plate 131 and the upper pressing sub - plate 153 are stressed and the stress is stable, so as to improve the structural stability among the upper pressing sub - plate 153, the lower pressing sub - plate 131 and the pre - pressing mechanism 140 during the pre - pressing process, further reducing the probability of the silicon steel sheet 20 slipping sideways during the pre - pressing process, and further improving the quality stability of the stator core pressing.

[0046] Further, in some embodiments, the preloading tie rod assembly 160 includes a preloading screw 161, two preloading nuts 163, and two preloading washers 162. Both ends of the preloading screw 161 are respectively inserted through the corresponding locking through holes 152 and the tension through holes corresponding to the lower ring plate 111. The two preloading washers 162 are respectively sleeved on both ends of the preloading screw 161. The two preloading nuts 163 are respectively screwed onto both ends of the preloading screw 161 to press the two preloading washers 162 against the upper surface of the upper pressing plate 150 and the lower surface of the lower ring plate 111 respectively.

[0047] When it is necessary to lock both ends of the preloading tie rod assembly 160 onto the upper pressing plate 150 and the lower ring plate 111 respectively, it is only necessary to insert both ends of the preloading screw 161 through the locking through holes 152 and the tension through holes on the lower ring plate 111 respectively, and screw two preloading nuts 163 onto both ends of the preloading screw 161 respectively to press the two preloading washers 162 against the upper surface of the upper pressing plate 150 and the lower surface of the lower ring plate 111 respectively, so as to press the stacked silicon steel sheets 20 between the lower pressing plate 130 and the lower tooth pressing plate 120. When it is necessary to disassemble and assemble the upper pressing plate 150, it is only necessary to rotate the preloading nut 163 on the upper pressing plate 150, which is simple and convenient to operate, making the operation of the generator stator core pressing device 100 simpler.

[0048] Furthermore, in some embodiments, the generator stator core pressing device 100 further includes a preloading tube (not shown in the figure). The preloading tube is sleeved on the preloading mechanism 140 or the preloading screw 161. When the preloading tube is sleeved on the preloading mechanism 140, the preloading tube is vertically placed on the lower pressing plate 130. When the preloading tube is sleeved on the preloading screw 161, the preloading tube is pressed against the lower surface of the lower ring plate 111 or the upper surface of the upper pressing plate 150 by the preloading nut 163. Specifically, the wall thickness of the preloading tube is greater than or equal to 5 millimeters.

[0049] The setting of the preloading tube is mainly used to adjust the preloading height position of the stator core. When the preloading tube is sleeved on the preloading mechanism 140, the position of the upper pressing plate 150 can be adjusted to a suitable height through the preloading tube; when the length of the preloading screw 161 is too long, the preloading tube can be sleeved on the upper end or the lower end of the threaded tie rod to lock the upper pressing plate 150 to a position with a suitable height to ensure better pressing effect of the stator core.

[0050] In some embodiments, the preloading tie rod assembly 160 includes a first tie rod (not shown in the figure) and a second tie rod (not shown in the figure). The length of the first tie rod is greater than the length of the second tie rod. Both ends of the first tie rod or the second tie rod are respectively locked to the upper pressing plate 150 and the lower ring plate 111.

[0051] When the preloading tie rod assembly 160 includes a preloading screw 161, a preloading gasket 162, and a preloading nut 163, the preloading tie rod assembly 160 includes a first screw and a second screw, and the length of the first screw is greater than that of the second screw.

[0052] During the press-fitting process of the entire stator core, a relatively large number of preloading tie rod assemblies 160 are required. During the multi-stage press-fitting process, by adaptively selecting first tie rods and second tie rods of different lengths for different stages of press-fitting work, the purpose of cost savings can be achieved.

[0053] In some embodiments, a plurality of first avoidance notches 154 are formed at intervals along the circumferential direction at the outer edge portion of the upper pressure plate 150. The first avoidance notches 154 are used to avoid the positioning ribs or rib plates on the stator frame 110. A plurality of second avoidance notches 132 are formed at intervals along the circumferential direction at the outer portion of the lower pressure plate 130. The second avoidance notches 132 are used to avoid the positioning ribs or rib plates on the stator frame 110.

[0054] In this way, the arrangement of the first avoidance notches 154 and the second avoidance notches 132 can ensure that the upper pressure plate 150 and the lower pressure plate 130 can avoid interference from the positioning ribs or rib plates, which is beneficial for the bottom surface of the lower pressure plate 130 to be fully attached to the silicon steel sheet 20. The upper pressure plate 150 can extend to the upper surface of the ring plate of the stator frame 110, realizing preloading of the stator core at each ring plate position of the stator frame 110, so that it can be applicable to the press-fitting work of the engine generator stator core with rib plates or positioning ribs on the stator frame 110, and has high applicability.

[0055] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A stator core pressing device for a generator, characterized in that, Comprising: Stator frame; Lower tooth pressing plate, placed on the lower ring plate of the stator frame; Lower pressing plate, parallel to and spaced from the lower tooth pressing plate; Preloading mechanism, placed on the lower pressing plate; Upper pressing plate, placed on the preloading mechanism; the upper pressing plate is provided with adjustment screw holes and locking through holes at intervals; the adjustment screw holes are located outside the locking through holes; Preloading tie rod assembly, with both ends detachably locked to the locking through holes and the tensioning through holes of the lower ring plate respectively; Adjustment bolt, with one end screwed into the adjustment screw hole and the other end abutted against the lower ring plate, middle layer ring plate or upper ring plate of the stator frame; Wherein, the length of the preloading mechanism in the height direction is adjustable to adjust the distance between the lower pressing plate and the lower tooth pressing plate, and is used to apply a preset downward pressure to the lower pressing plate.

2. The generator stator core pressing device according to claim 1, characterized in that The upper pressing plate includes a plurality of upper pressing sub - plates arranged at intervals in the circumferential direction and in a fan - shape; each of the upper pressing sub - plates is provided with the locking through holes and the adjustment screw holes at intervals; The lower pressing plate includes a plurality of lower pressing sub - plates arranged at intervals in the circumferential direction and in a fan - shape; the number of the lower pressing sub - plates is the same as that of the upper pressing sub - plates and they correspond one by one; at least one preloading mechanism is placed on each of the lower pressing plates; The number of the preloading tie rod assemblies is the same as that of the locking through holes and they correspond one by one; both ends of the preloading tie rod are detachably locked to the corresponding locking through holes and the corresponding tensioning through holes on the lower ring plate respectively.

3. The generator stator core pressing device according to claim 2, characterized in that, A plurality of preloading mechanisms are placed on each of the lower pressing plates, and the plurality of preloading mechanisms are evenly distributed in the middle of the lower pressing plate.

4. The generator stator core pressing device according to claim 2, wherein, The preloading tie rod assembly includes a preloading screw, two preloading nuts and two preloading washers; both ends of the preloading screw are respectively passed through the corresponding locking through holes and the corresponding tensioning through holes on the lower ring plate; the two preloading washers are respectively sleeved on both ends of the preloading screw; the two preloading nuts are respectively screwed on both ends of the preloading screw to press the two preloading washers against the upper surface of the upper pressing plate and the lower surface of the lower ring plate respectively.

5. The generator stator core pressing device according to claim 4, characterized in that, It further includes a preloading pipe; the preloading pipe is sleeved on the preloading mechanism or the preloading screw; When the preloading pipe is sleeved on the preloading mechanism, the preloading pipe is vertically placed on the lower pressing plate; when the preloading pipe is sleeved on the preloading screw, the preloading pipe is pressed by the preloading nut against the lower surface of the lower ring plate or the upper surface of the upper pressing plate.

6. The generator stator core pressing device according to claim 1, characterized in that, The preloading tie rod assembly includes a first tie rod and a second tie rod; the length of the first tie rod is greater than that of the second tie rod; both ends of the first tie rod or the second tie rod are locked to the upper pressing plate and the lower ring plate respectively.

7. The generator stator core pressing device according to claim 1, wherein The preloading mechanism is a mechanical jack.

8. The generator stator core pressing device according to claim 1, characterized in that A plurality of first avoidance notches are formed at intervals in the circumferential direction at the outer edge part of the upper pressing plate; the first avoidance notches are used to avoid the positioning ribs or rib plates on the stator frame; a plurality of second avoidance notches are formed at intervals in the circumferential direction at the outer part of the lower pressing plate; the second avoidance notches are used to avoid the positioning ribs or rib plates on the stator frame.

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