Finger pressing wind shield and stator end ventilation structure

Abstract

The utility model discloses a finger pressing wind shield and a stator end ventilation structure. The finger pressing wind shield at least comprises but is not limited to a main wind shield and a wind shield toothed plate. The wind blocking toothed plates are arranged on one side of the main wind blocking plate and are evenly arranged at intervals in the length direction of the main wind blocking plate, and gaps between the adjacent wind blocking toothed plates form spaces for avoiding winding bars; according to the scheme, in an altitude or high-voltage unit, the situation that corona is generated in a small gap between the notch cushion block and the winding bar, and insulation of the winding bar is damaged can be effectively avoided, the insulation service life of the whole unit is prolonged, and safe operation of the unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of manufacturing of hydro-generators, and particularly relates to a finger pressing wind shield and a stator end ventilation structure. Background Art

[0002] Notch pads are usually arranged between adjacent bars at the end of the stator winding of a large hydro-generator and above the finger pressing plate fingers, as Figure 5 shown. On one hand, the notch pads are tied to the bars to form an integral whole of all the bars, thereby strengthening the fixation of the bars; on the other hand, they can block the wind passing through the fingers to prevent the cooling wind from leaking through the gap between the fingers and the bars, so as to ensure the cooling air volume of the generator.

[0003] In order to ensure the firm fixation of the notch pads and the bars, a felt needs to be added to the contact surface between the notch pads and the bars during installation to eliminate the gap on the contact surface. However, in fact, this gap is often difficult to completely eliminate because the insulation thickness of the bar at the junction of the low-resistance section and the high-resistance section of the bar insulation where the notch pad is located is inconsistent, and there must be a small gap between the notch pad and the thinner insulation part.

[0004] For high-altitude or high-voltage units, the small gap between the notch pad and the bar is very likely to generate corona, thereby damaging the bar insulation, reducing the insulation life, and endangering the safe operation of the unit. Content of the Utility Model

[0005] The purpose of the utility model is to provide a finger pressing wind shield and a stator end ventilation structure for the above-mentioned deficiencies, and solve the problem that the small gap between the notch pad and the bar in the prior art is very likely to generate corona, thereby damaging the bar insulation, reducing the insulation life, and endangering the safe operation of the unit.

[0006] The utility model is realized by the following scheme:

[0007] A stator end ventilation structure includes at least but not limited to a main wind shield and a wind tooth plate; the wind tooth plate is arranged on one side of the main wind shield and is evenly spaced along the length direction of the main wind shield, and the gap between adjacent wind tooth plates forms a space for avoiding the bars.

[0008] Based on the above structure of a finger pressing wind shield, the main wind shield is an arc-shaped structure matching the radian of the end face of the stator core.

[0009] Based on the above structure of a finger pressing wind shield, the length of the wind tooth plate is not less than the width of two bars, and the end of the wind tooth plate does not protrude beyond the outermost bar.

[0010] Based on the above structure of the finger-pressing wind shield, the spacing length between adjacent wind shield teeth plates matches the thickness of the wire bar.

[0011] Based on the above structure of the finger-pressing wind shield, there is a 0.5 mm gap between the edges of the main wind shield and the wind shield teeth plates and the wire bar respectively.

[0012] Based on the above structure of the finger-pressing wind shield, the main wind shield and the wind shield teeth plates are made of insulating materials.

[0013] Based on the above structure of the finger-pressing wind shield, a plurality of first mounting holes are provided in the length direction of the main wind shield, and a plurality of second mounting holes are also provided on the wind shield teeth plates.

[0014] This solution discloses a stator end ventilation structure, which at least includes but is not limited to a shroud, an outer end wind shield and a finger-pressing wind shield; the shroud is arranged circumferentially around the inner circle of the stator core, the finger-pressing wind shield is arranged on the fingers on the stator core, and the outer end wind shield is arranged between the outside of the tooth pressing plate and the stator frame.

[0015] Based on the above stator end ventilation structure, the shroud is composed of multiple sections of arc-shaped insulating materials, and binding holes are provided on the shroud, and it is bound to the stator wire bar through binding straps.

[0016] Based on the above stator end ventilation structure, the outer end wind shield consists of multiple sections of arc-shaped angle steels to form a complete circle, and its overall cross-section is an L-shaped structure, where one right-angled side is welded to the outer circle of the pressing plate, and the other right-angled side contacts the stator frame ring plate.

[0017] To sum up, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0018] 1. In this solution for high altitude or high voltage units, it can effectively avoid the occurrence of corona between the slot wedge and the wire bar due to small gaps, damage to the insulation of the wire bar, improve the overall insulation life of the unit, and ensure the safe operation of the unit.

[0019] 2. The stator end ventilation structure proposed in this proposal cancels the slot wedge, eliminating the corona risk at the end of the stator winding of high altitude units; at the same time, a wind shield is arranged on the finger, enabling the cooling air to cool through the finger, and avoiding a large amount of leakage of the cold air from the gap between the wire bar and the finger, ensuring the cooling effect of the unit; and the wind shield adopted in this structure only needs to be bolted to the finger, compared with the binding of the slot wedge, greatly reducing the workload and working difficulty, and improving the convenience of unit installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the finger-pressing wind shield in the present utility model;

[0021] Figure 2 Schematic diagram of the assembly of the medium-voltage finger windshield in the present utility model;

[0022] Figure 3 Cross-sectional structure schematic diagram of the stator end ventilation structure in the present utility model;

[0023] Figure 4 Front view structure schematic diagram of the stator end ventilation structure in the present utility model;

[0024] Figure 5 Schematic diagram of the prior art of the present utility model;

[0025] Description of the drawings: 1. Main windshield; 2. Windshield tooth plate; 3. Conductor bar; 4. Stator core; 5. Pressing finger; 6. First mounting hole; 7. Second mounting hole; 8. Pressure plate; 9. Screen; 10. Outer end windshield; 11. Stator frame. Detailed implementation manners

[0026] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0027] Any feature disclosed in this specification (including any additional claims, abstract) can be replaced by other equivalent or similar-purpose alternative features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only an example of a series of equivalent or similar features.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model.

[0029] In addition, terms such as "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0030] Embodiment 1

[0031] As Figures 1 to 2 shown, the present utility model provides a technical solution:

[0032] A finger-pressing wind baffle, which at least includes but is not limited to a main wind baffle 1 and a wind baffle tooth plate 2; the wind baffle tooth plate 2 is arranged on one side of the main wind baffle 1 and is evenly spaced along the length direction of the main wind baffle 1, and the gap between adjacent wind baffle tooth plates 2 forms a space for avoiding the wire bar 3.

[0033] Based on the above structure, when in use, the main wind baffle 1 and the wind baffle tooth plate 2 are placed flat in the cavity between adjacent wire plates. The main wind baffle 1 blocks most of the gap between the wire bar 3 and the pressing plate 8; the wind baffle tooth plate 2 can block most of the gap between the finger press 5 and the wire bar 3. Finally, most of the areas where air leaks through this finger-pressing wind baffle are blocked, so that the flow direction of the air can only move along the specified direction; compared with using notch pads in the prior art, in this solution for high-altitude or high-voltage units, it can effectively avoid the occurrence of corona between the notch pad and the wire bar 3, damaging the insulation of the wire bar 3, improving the insulation life of the overall unit, and ensuring the safe operation of the unit.

[0034] As an example, the main wind baffle 1 is an arc-shaped structure that matches the end face radian of the stator core 4.

[0035] Based on the above structure, since the finger press 5 is arranged circumferentially around the stator core 4, by setting the main wind baffle 1 as an arc-shaped structure, it can better fit on the finger press 5 to avoid air leakage.

[0036] As an example, the length of the wind baffle tooth plate 2 is not less than the width of two wire bars 3, and the end of the wind baffle tooth plate 2 does not protrude beyond the outermost wire bar 3, and the interval length between adjacent wind baffle tooth plates 2 matches the thickness of the wire bar 3.

[0037] Based on the above structure, by specially setting the length of the wind baffle tooth plate 2, the wind baffle tooth plate 2 can exactly block most of the gap between the finger press 5 and the wire bar 3. At the same time, by specially setting the interval between adjacent wind baffle tooth plates 2, it can be quickly inserted into the interval between adjacent wire bars 3 to avoid interference.

[0038] As an example, the edges of the main wind baffle 1 and the wind baffle tooth plate 2 are respectively spaced 0.5 mm from the wire bar 3.

[0039] Based on the above structure, through the special interval setting of 0.5 mm, this gap is not too small to generate corona between the wind baffle and the wire bar 3, nor too large to cause excessive air volume leakage.

[0040] As an example, the main wind baffle 1 and the wind baffle tooth plate 2 are made of insulating materials with a certain strength. Using insulating materials can avoid affecting the internal electrical performance.

[0041] As an example, a plurality of first mounting holes 6 are provided in the longitudinal direction of the main windshield 1, and a plurality of second mounting holes 7 are also provided on the windshield tooth plate 2.

[0042] Based on the above structure, the main windshield 1 and the windshield tooth plate 2 are stably fixed on the press finger 5 through the first mounting hole 6 and the second mounting hole 7, so that the press finger windshield can perform stable windshield operation.

[0043] Embodiment 2

[0044] As Figures 3 to 4 shown, based on the above Embodiment 1, the present invention provides a technical solution:

[0045] A stator end ventilation structure, which at least includes but is not limited to a screen 9, a press finger windshield and an outer end windshield 10; the screen 9 is arranged around the inner circumferential position of the stator core 4, the press finger windshield is arranged on the press finger 5 on the stator core 4, and the outer end windshield 10 is arranged between the outside of the tooth pressing plate 8 and the stator frame 11.

[0046] Based on the above structure, the gap between adjacent wire bars 3 above the press finger 5 is closed by the screen 9, then the gap between the wire bar 3 and the press finger 5 and the pressing plate 8 is closed by the press finger windshield, and finally the gap between the stator frame 11 and the pressing plate 8 is closed by the outer end windshield 10 of the pressing plate 8, so as to form a passage with a predetermined path inside the stator core 4, ensuring that the cooling air entering the press finger 5 finally flows radially through the tooth pressing plate 8 to the stator frame 11, and finally flows to the air cooler outside the frame.

[0047] As an example, the screen 9 is composed of multiple sections of arc-shaped insulating materials, and binding holes are opened on the screen 9, and it is bound to the stator wire bar 3 through binding straps.

[0048] As an example, the outer end windshield 10 is composed of multiple sections of arc-shaped angle steels to form a complete circle, and its overall cross-section is an L-shaped structure, where one right-angled side is welded to the outer circle of the pressing plate 8, and the other right-angled side is in contact with the ring plate of the stator frame 11.

[0049] Based on the above structure, the stator end ventilation structure proposed in this proposal cancels the notch pads, eliminating the corona risk at the end of the stator winding of high-altitude units; at the same time, this structure is provided with a windshield on the press finger 5, so that the cooling air can be cooled through the press finger 5, and at the same time, it avoids a large amount of leakage of cold air from the gap between the wire bar 3 and the press finger 5, ensuring the cooling effect of the unit; and the windshield adopted by this structure only needs to be fastened to the press finger 5, compared with the binding of the notch pads, it greatly reduces the workload and working difficulty, and improves the convenience of unit installation.

[0050] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A finger-pressing wind deflector, characterized in that, It includes at least, but is not limited to, a main wind deflector and wind deflector teeth plates; the wind deflector teeth plates are arranged on one side of the main wind deflector and are evenly spaced along the length direction of the main wind deflector, and the gaps between adjacent wind deflector teeth plates form spaces for avoiding the wire bars.

2. The finger-pressing windshield according to claim 1, characterized in that: The main wind deflector is an arc-shaped structure matching the radian of the end face of the stator core.

3. The finger-pressing windshield according to claim 2, wherein: The length of the wind deflector teeth plates is not less than the width of two wire bars, and the ends of the wind deflector teeth plates do not protrude beyond the outermost wire bars.

4. The pressing finger windshield according to claim 3, characterized in that: The spacing length between adjacent wind deflector teeth plates matches the thickness of the wire bars.

5. The pressing finger windshield according to claim 4, wherein: The edges of the main wind deflector and the wind deflector teeth plates are respectively spaced 0.5 mm from the wire bars.

6. The pressing finger windshield according to claim 5, characterized in that: The main wind deflector and the wind deflector teeth plates are made of insulating materials.

7. The pressing finger windshield according to claim 6, wherein: A plurality of first mounting holes are arranged in the length direction of the main wind deflector, and a plurality of second mounting holes are also arranged on the wind deflector teeth plates.

8. A stator end ventilation structure, characterized in that: It includes at least, but is not limited to, a screen, an outer end wind deflector and a finger pressing wind deflector as described in any one of claims 1 to 7; the screen is arranged circumferentially around the inner circle of the stator core, the finger pressing wind deflector is arranged on the finger press on the stator core, and the outer end wind deflector is arranged between the outside of the tooth pressing plate and the stator frame.

9. The stator end ventilation structure according to claim 8, wherein: The screen is composed of multiple sections of arc-shaped insulating materials, and binding holes are formed in the screen, and it is bound to the stator wire bars through binding straps.

10. A stator end ventilation structure according to claim 9, characterized in that: The outer end wind deflector is composed of multiple sections of arc-shaped angle steels to form a complete circle, and its overall cross-section is an L-shaped structure, with one right-angled side welded to the outer circle of the pressing plate and the other right-angled side in contact with the ring plate of the stator frame.

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