CN111786513A - Turbine generator pivot earthing device - Google Patents
Turbine generator pivot earthing device Download PDFInfo
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- CN111786513A CN111786513A CN202010446534.2A CN202010446534A CN111786513A CN 111786513 A CN111786513 A CN 111786513A CN 202010446534 A CN202010446534 A CN 202010446534A CN 111786513 A CN111786513 A CN 111786513A
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- sliding
- rotating shaft
- locking
- turbine generator
- grounding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention discloses a turbine generator rotating shaft grounding device, comprising: the supporting mechanism is arranged beside the rotating shaft; the sliding mechanism comprises a sliding fixing part fixed on the supporting device and a sliding part in sliding fit with the sliding fixing part; and the flexible grounding piece is connected with the sliding part and can move along with the sliding part so as to realize the contact with or the separation from the rotating shaft. The grounding device for the rotating shaft of the steam turbine generator can enable the flexible grounding piece to be freely moved out or fixed at an operation position, so that the online replacement of the flexible grounding piece and the self-locking function of the device are realized.
Description
Technical Field
The invention relates to the technical field of grounding of a rotating shaft of a large-sized steam turbine generator, in particular to a grounding device of the rotating shaft of the steam turbine generator.
Background
The shaft voltage is inevitable in the operation of the steam turbine generator unit, generally the shaft voltage does not exceed a few volts or more than ten volts, but when the insulating pad loses the effect due to oil stains, damage, aging and the like, the shaft voltage is enough to break through an oil film between the shaft and the bearing to generate discharge, and a loop generated by shaft current is formed. The shaft current not only can damage the stability of an oil film and gradually degrade lubricating and cooling oil, but also can cause local burning of the bearing due to high current density of a metal contact point because the shaft current passes through the small metal contact point between the bearing and the rotating shaft and high temperature is generated instantaneously. The bearing alloy which is fused is splashed under the action of rolling force, and a small pit is burnt on the inner surface of the bearing. Finally, the bearing is damaged due to accelerated mechanical wear, and the bearing bush is burnt out in severe cases, so that the machine is forced to stop.
In order to prevent the shaft current from damaging the rotating shaft and the bearing, a grounding device is usually arranged at the steam end of the rotating shaft to ensure that the rotating shaft is reliably grounded when the unit operates, so that a release path is provided for charges on the rotating shaft, and the discharging through an oil film is avoided. The inventor knows that one implementation mode is that a combined bracket is fixed on an oil blocking cover, a brush box is arranged on the combined bracket, a carbon brush arranged in the brush box is contacted with a rotating shaft, and the rotating shaft is grounded through the carbon brush; after the unit operates for a period of time, when the carbon brush is excessively worn, the carbon brush needs to be replaced. The other implementation way known by the inventor is that the combined support is fixed on the oil blocking cover, the copper braid is arranged on the combined support, the rotating shaft is grounded through the copper braid, and in order to ensure good contact between the copper braid and the rotating shaft, the bottom end of the copper braid is also provided with the heavy object block, so that the abrasion of the copper braid is accelerated by the heavy object block, and the service life of the copper braid is shortened; after the unit operates for a period of time, when the copper braid is worn to an excessive extent, the copper braid needs to be replaced.
However, the invention recognizes that when the carbon brush or the copper braid is replaced, if the bolt or the tool falls on the rotating shaft rotating at a high speed, equipment damage or personnel injury may be caused, and if the carbon brush or the copper braid is replaced during shutdown, unplanned shutdown of the power plant may be caused, so that great economic loss is caused.
Disclosure of Invention
To the problem that above-mentioned exists, provide a turbine generator pivot earthing device, can realize that flexible ground connection spare freely shifts out from the operating position to operation safety when the guarantee is changed flexible ground connection spare.
In some embodiments, a turbine generator shaft grounding assembly comprises:
the supporting mechanism is arranged beside the rotating shaft;
the sliding mechanism comprises a sliding fixing part fixed on the supporting device and a sliding part in sliding fit with the sliding fixing part; and
and the flexible grounding piece is connected with the sliding part and can move along with the sliding part so as to realize the contact with or the separation from the rotating shaft.
In some embodiments, the supporting mechanism comprises a rotating shaft cover matched with the rotating shaft, and an operation box which is partially overlapped with the rotating shaft cover and is provided with an opening; the sliding fixing part is arranged on the inner wall of the operating box, and the moving direction of the sliding part is parallel to the radial direction of the rotating shaft.
In at least one embodiment, the shaft cover is cylindrical, and the operation box is a square box.
In some embodiments, the sliding fixing portion is a sliding groove, the sliding portion is a sliding block with a pull rod at a head end, and a grounding piece hanging frame used for connecting the flexible grounding piece is rotatably arranged on the sliding block.
In at least one embodiment, the grounding part hanger comprises a rotating plate and a connecting plate, the rotating plate is connected with the sliding block through a pin shaft and locked through a locking nut, and the connecting plate is used for installing the flexible grounding part.
In some embodiments, the above turbine generator shaft grounding device further includes a locking mechanism for locking the slip sliding portion with respect to the slip fixing portion.
In at least one embodiment, the locking mechanism comprises a locking female member arranged on the sliding groove and a locking sleeve sleeved on the pull rod and provided with a locking male member.
In at least one embodiment, the female locking member is an inflection hole formed in a groove wall of the sliding groove, the male locking member is a straight rod arranged on the locking sleeve, and the straight rod can move along an inflection path of the inflection hole by rotating or axially moving the locking sleeve along the pull rod, so that the sliding block is locked relative to the sliding groove.
In at least one embodiment, a limiting member is disposed in the sliding groove, and a spring is disposed between the limiting member and the tail end of the slider and used for clamping the straight rod in the crank-shaped hole.
In at least one embodiment, the limiting member is a limiting baffle plate with a guide rod, and the guide rod is inserted in the spring, the sliding block and the pull rod.
In at least one embodiment, an opening of the sliding groove is provided with an inward edge for preventing the sliding block from falling out of the sliding groove.
In some embodiments, the flexible ground element is a copper braid.
In some embodiments, the flexible ground member is provided in at least two pieces.
By comprehensively adopting the technical scheme, the invention can obtain the following technical effects:
1. by arranging the supporting mechanism and the sliding mechanism, when the copper braid needs to be replaced when the generator runs, the copper braid can be freely moved out from the running position and is far away from the rotating shaft rotating at a high speed, tools or parts are prevented from falling on the rotating shaft rotating at the high speed during replacement, and the safety of personnel and equipment is ensured;
2. by arranging two copper braids, when one copper braid is replaced, the rotating shaft is effectively grounded through the other copper braid, so that the safety of the rotating shaft and the bearing of the generator is ensured, and the online replacement of the copper braids is realized;
3. through set up spring and locking mechanism at the tail end of slider, change the copper pigtail back, can block the copper pigtail at the operating position firmly, realize the device auto-lock, convenient operation is swift, and ground connection is reliable moreover.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the present invention in some embodiments;
FIG. 2(a) is a front view of FIG. 1;
FIG. 2(b) is a cross-sectional view taken at A-A in FIG. 2 (a);
FIG. 2(c) is an enlarged view at D in FIG. 2 (b);
FIG. 3(a) is a schematic view of a structure in which a rotating shaft is grounded in exemplary embodiment 1;
FIG. 3(b) is a schematic view of the structure of an example embodiment 1 during replacement of a copper braid;
FIG. 4 is a schematic cross-sectional view of a skid mechanism in some embodiments;
fig. 5 is a perspective view of a glide mechanism in some embodiments.
Description of reference numerals:
the device comprises a rotating shaft 1, a rotating shaft cover 2, an operation box 3, a flexible grounding part 4, a guide rod 5, a spring 6, a pull rod 7, a locking sleeve 8, a sliding block 9, a grounding part hanger 10, a sliding chute 11, a limiting part 12, a straight rod 13 and a crank-shaped hole 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the drawings of the present invention, it should be understood that different technical features which are not mutually substituted are shown in the same drawing only for the convenience of simplifying the drawing description and reducing the number of drawings, and the embodiment described with reference to the drawings does not indicate or imply that all the technical features in the drawings are included, and thus the present invention is not to be construed as being limited thereto.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In some embodiments, a turbine generator shaft grounding assembly comprises: the supporting mechanism is arranged beside the rotating shaft 1; the sliding mechanism comprises a sliding fixing part fixed on the supporting device and a sliding part in sliding fit with the sliding fixing part; and a flexible grounding part 4 connected with the sliding part and capable of moving along with the sliding part so as to realize contact with or separation from the rotating shaft 1.
In the embodiments, by arranging the supporting mechanism and the sliding mechanism, when the flexible grounding part 4 needs to be replaced during the operation of the generator, the flexible grounding part 4 can be freely moved out of the operation position and is far away from the rotating shaft 1 rotating at a high speed, so that tools or parts are prevented from falling on the rotating shaft 1 rotating at a high speed during the replacement, and the safety of personnel and equipment is ensured.
One of the functions of the supporting mechanism is to fix the sliding mechanism, and the structural form of the supporting mechanism can be designed according to the practical application condition. In some embodiments, the supporting mechanism includes a rotating shaft cover 2 matching with the rotating shaft, and an operation box 3 partially overlapping with the rotating shaft cover 2 and provided with an opening; the sliding fixing part is arranged on the inner wall of the operation box 3, and the moving direction of the sliding part is parallel to the radial direction of the rotating shaft 1.
The shaft cover 2 serves as a protective shell of the shaft 1 in addition to realizing the basic supporting function, and prevents sundries from falling on the shaft 1 rotating at high speed. One of the functions of the operation box 3 connected with the rotating shaft cover 2 is to fix the sliding mechanism, which can also provide a containing space for the moving in and out of the flexible grounding piece 4, and the flexible grounding piece 4 can be replaced in the containing space, so that tools or parts can be prevented from scattering around during replacement, and the replacement operation is not influenced by other field mechanisms outside the containing space. In at least one embodiment, the rotating shaft cover 2 is cylindrical and is sleeved on the periphery of the rotating shaft 1, and the operation box 3 is a square box and is arranged on one side of the rotating shaft 1. The sliding mechanism is fixed on the oblique upper part of the rotating shaft 1.
The sliding part of the sliding mechanism drives the flexible grounding part 4 to move along the direction parallel to the radial direction of the rotating shaft 1, the flexible grounding part 4 can be kept in good contact with the rotating shaft 1 when being close to the rotating shaft 1, and the safe replacement of the flexible grounding part 4 can be ensured when being far away from the rotating shaft 1. In some embodiments, the sliding fixing part is a sliding groove 11, the sliding part is a sliding block 9 with a pull rod 7 at the head end, and a grounding part hanger 10 for connecting the flexible grounding part 4 is rotatably arranged on the sliding block 9.
The ground suspension 10 serves as an intermediate connection between the slider 9 and the flexible ground 4. In at least one embodiment, the grounding member hanger 10 includes a rotating plate that is pin-connected to the slider 9 and locked by a locking nut, and a connecting plate for mounting the flexible grounding member 4. In one or more embodiments, a handle is arranged on the rotating plate, and when the compression degree of the locking nut is proper, the handle can be rotated to adjust the included angle between the flexible grounding piece 4 and the connecting plate, so that the bending damage of the flexible grounding piece 4 at the connecting part with the connecting plate is reduced.
In order to stabilize the contact of the flexible grounding member 4 during normal operation of the unit, in some embodiments, the turbine generator shaft grounding device further includes a locking mechanism for locking the sliding portion with respect to the sliding fixing portion. Through setting up locking mechanism, can make the sliding part that slides fixed for the sliding part that slides, keep the position of flexible ground contact 4 unchangeable to realize the stable contact of flexible ground contact 4 and pivot 1.
The locking mechanism realizes the locking of the mechanism through the mutual matching of a male locking piece and a female locking piece. In at least one embodiment, the locking mechanism includes a female locking member disposed on the sliding slot 11 and a locking sleeve 8 disposed on the pull rod 7 and having a male locking member. In at least one embodiment, the female locking part is an elbow-shaped hole 14 on the groove wall of the sliding groove 11, the male locking part is a straight rod 13 arranged on the locking sleeve 8, and the straight rod 13 can move along the elbow-shaped path of the elbow-shaped hole 14 by rotating or axially moving the locking sleeve 8 along the pull rod 7, so that the sliding block 9 can be locked relative to the sliding groove 11.
The steam turbine generator rotating shaft grounding device has a self-locking function and can be realized by arranging the spring 6 at the tail end of the sliding block 9. In at least one embodiment, a limiting member 12 is disposed in the sliding slot 11, and a spring 6 is disposed between the limiting member 12 and the tail end of the sliding block 9, for clamping the straight rod 13 in the crank hole 14.
The stable and reliable moving track of the sliding block 9 in the sliding groove 11 is realized through an auxiliary guiding mechanism, in at least one embodiment, the limiting part 12 is a limiting baffle with a guiding rod 5, and the guiding rod 5 is inserted in the spring 6, the sliding block 9 and the pull rod 7. In one or more other embodiments, the opening of the sliding groove 11 has an inward edge for preventing the sliding block 9 from being removed from the sliding groove 11.
The flexible ground 4 is optionally a copper braid. In some embodiments, the braid is provided in at least two pieces. In at least one embodiment, two copper braids are arranged, when one copper braid is replaced, the rotating shaft 1 is effectively grounded through the other copper braid, the safety of the rotating shaft 1 and a bearing of the generator is guaranteed, and online replacement of the copper braids is achieved.
At least one exemplary embodiment is now provided in connection with the drawings, a detailed description of which is provided in the drawings not intended to limit the scope of the claimed invention, but is merely representative of exemplary embodiments provided in the invention.
A grounding device for a rotating shaft of a steam turbine generator comprises a supporting mechanism, a sliding mechanism and a flexible grounding piece.
The supporting mechanism is arranged beside the rotating shaft 1 and comprises a rotating shaft 2 matched with the rotating shaft 1 and an operating box 3 which is partially overlapped with the rotating shaft cover 2 and is provided with an opening. The rotating shaft cover 2 is cylindrical and is sleeved on the periphery of the rotating shaft 1, and the operating box 3 is a square box and is arranged on one side of the rotating shaft 1.
The sliding mechanism is arranged obliquely above the rotating shaft 1 and comprises a sliding fixing part fixed on the supporting device and a sliding part in sliding fit with the sliding fixing part. The sliding fixing part is arranged on the inner wall of the operation box 3, and the moving direction of the sliding part is parallel to the radial direction of the rotating shaft 1. The flexible grounding part 4 is connected with the sliding part and can move along with the sliding part so as to realize the contact with or the separation from the rotating shaft 1. The sliding fixing part is a sliding chute 11, the sliding part is a sliding block 9 with a pull rod 7 at the head end, and a grounding part hanging frame 10 used for connecting the flexible grounding part 4 is rotatably arranged on the sliding block 9. The grounding part hanger 10 comprises a rotating plate provided with a handle and a connecting plate used for mounting the flexible grounding part 4, and the rotating plate is connected with the sliding block 9 through a pin shaft and locked through a locking nut.
The steam turbine generator rotating shaft grounding device further comprises a locking mechanism used for locking the sliding part relative to the sliding fixing part. The locking mechanism comprises a locking female part arranged on the sliding groove 11 and a locking sleeve 8 which is sleeved on the pull rod 7 and provided with a locking male part. The female locking part is a bent hole 14 in the wall of the sliding groove 11, the male locking part is a straight rod 13 arranged on the locking sleeve 8, and the straight rod 13 can move along a bent path of the bent hole 14 by rotating or axially moving the locking sleeve 8 along the pull rod 7, so that the sliding block 9 is locked relative to the sliding groove 11. A limiting part 12 is arranged in the sliding groove 11, the limiting part 12 is a limiting baffle with a guide rod 5, the guide rod 5 is inserted in the spring 6, the sliding block 9 and the pull rod 7, a unthreaded hole is formed in the sliding block 9, the pull rod 7 is in a hollow cylindrical shape, and the diameter of the unthreaded hole and the inner diameter of the pull rod 7 are slightly larger than the outer diameter of the guide rod 5. A spring 6 is arranged between the limiting piece 12 and the tail end of the sliding block 9 and used for clamping the straight rod 13 in the cranked hole 14.
The flexible grounding piece 4 is a copper braid and is provided with two copper braids.
The working principle of the steam turbine generator rotating shaft grounding device is as follows:
as shown in fig. 3(a), when the locking mechanism is in a locking state, the spring 6 is in a compressed state, and the rotating shaft 1 is reliably grounded through a copper braid. When the copper braid needs to be replaced, the locking sleeve 8 is rotated and pushed, the straight rod 13 on the locking sleeve 8 is separated from the elbow-shaped hole 14, and the pull rod 7 is pulled outwards to drive the copper braid to be away from the rotating shaft 1, as shown in fig. 3 (b). After the replacement is completed, the locking sleeve 8 is pushed and rotated, so that the copper braid is lapped on the rotating shaft 1, and the straight rod 13 is firmly clamped in the crutch-shaped hole 14 by the elastic force of the spring 6, and the state shown in fig. 3(a) is recovered.
The present embodiment is different from exemplary embodiment 1 in that:
in this embodiment, a guide rod is not provided, but an opening of the sliding groove 11 is provided with an inward edge for preventing the sliding block 9 from being disengaged from the sliding groove 11, and a guiding function is realized.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The utility model provides a turbo generator pivot earthing device which characterized in that includes:
the supporting mechanism is arranged beside the rotating shaft;
the sliding mechanism comprises a sliding fixing part fixed on the supporting device and a sliding part in sliding fit with the sliding fixing part; and the flexible grounding piece is connected with the sliding part and can move along with the sliding part so as to realize the contact with or the separation from the rotating shaft.
2. The turbine generator shaft grounding device according to claim 1, further comprising a locking mechanism for locking the slip sliding portion with respect to the slip fixing portion.
3. The grounding device for a rotating shaft of a steam turbine generator as claimed in claim 1 or 2, wherein the supporting mechanism comprises a rotating shaft cover part matched with the rotating shaft and an operation box which is overlapped with the rotating shaft cover part and is provided with an opening; the sliding fixing part is arranged on the inner wall of the operating box, and the moving direction of the sliding part is parallel to the radial direction of the rotating shaft.
4. The grounding device for a steam turbine generator rotating shaft according to claim 1 or 2, wherein the sliding fixing portion is a sliding groove, the sliding portion is a sliding block with a pull rod at the head end, and a grounding member hanger for connecting the flexible grounding member is rotatably arranged on the sliding block.
5. The grounding device for the rotating shaft of the steam turbine generator as claimed in claim 4, wherein the grounding member hanger comprises a rotating plate and a connecting plate, the rotating plate is connected with the sliding block through a pin shaft and locked through a locking nut, and the connecting plate is used for mounting the flexible grounding member.
6. The grounding device for a steam turbine generator rotating shaft as claimed in claim 4, wherein the locking mechanism comprises a locking female member disposed on the sliding groove and a locking sleeve disposed on the pull rod and having a locking male member.
7. The grounding device for the rotating shaft of the steam turbine generator as claimed in claim 6, wherein the female locking member is a crank-shaped hole formed in a wall of the sliding groove, the male locking member is a straight rod disposed on the locking sleeve, and the straight rod can be moved along a crank-shaped path of the crank-shaped hole by rotating or axially moving the locking sleeve along the pull rod, so as to achieve the locking of the sliding block relative to the sliding groove.
8. The grounding device for a rotating shaft of a steam turbine generator as claimed in claim 7, wherein a position-limiting member is disposed in the sliding slot, and a spring is disposed between the position-limiting member and the tail end of the sliding block for clamping the straight rod in the crank-shaped hole.
9. The grounding device for a steam turbine generator rotating shaft of claim 8, wherein the limiting member is a limiting baffle plate with a guide rod, and the guide rod is inserted into the spring, the sliding block and the pull rod.
10. The grounding device for a rotating shaft of a steam turbine generator as claimed in claim 8, wherein an opening of the sliding groove is provided with an inward edge for preventing the sliding block from being removed from the sliding groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010446534.2A CN111786513B (en) | 2020-05-25 | 2020-05-25 | Turbine generator pivot earthing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010446534.2A CN111786513B (en) | 2020-05-25 | 2020-05-25 | Turbine generator pivot earthing device |
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| Publication Number | Publication Date |
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| CN111786513A true CN111786513A (en) | 2020-10-16 |
| CN111786513B CN111786513B (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010446534.2A Active CN111786513B (en) | 2020-05-25 | 2020-05-25 | Turbine generator pivot earthing device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6062847A (en) * | 1983-09-14 | 1985-04-11 | Toshiba Corp | Grounding device of rotary machine |
| CN202444381U (en) * | 2012-03-13 | 2012-09-19 | 中国神华能源股份有限公司 | Rotating shaft grounding device for generator |
| US20130032373A1 (en) * | 2011-08-05 | 2013-02-07 | Cutsforth Products, Inc. | Grounding rope guide for a dynamo-electric machine |
| CN212463026U (en) * | 2020-05-25 | 2021-02-02 | 东方电气集团东方电机有限公司 | Turbine generator pivot earthing device |
-
2020
- 2020-05-25 CN CN202010446534.2A patent/CN111786513B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6062847A (en) * | 1983-09-14 | 1985-04-11 | Toshiba Corp | Grounding device of rotary machine |
| US20130032373A1 (en) * | 2011-08-05 | 2013-02-07 | Cutsforth Products, Inc. | Grounding rope guide for a dynamo-electric machine |
| CN202444381U (en) * | 2012-03-13 | 2012-09-19 | 中国神华能源股份有限公司 | Rotating shaft grounding device for generator |
| CN212463026U (en) * | 2020-05-25 | 2021-02-02 | 东方电气集团东方电机有限公司 | Turbine generator pivot earthing device |
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| CN111786513B (en) | 2021-06-08 |
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