阅读说明：本技术 抽水蓄能电机滑环结构 (Slip ring structure of pumped storage motor ) 是由 *** 于 2020-07-28 设计创作，主要内容包括：本发明公开了一种抽水蓄能电机滑环结构,集电环在轴向设置为一个是正极环、一个负极环,正、负极环之间设置有绝缘套,两者之间处于绝缘状态,在集电环外侧配合设置碳刷；正极环、负极环外侧配合设置的碳刷为轴向分布的两层正极碳刷、负极碳刷,正极碳刷与正极环接触时形成导电通路,负极碳刷与负极环接触时形成导电通路；所述的正极碳刷、负极碳刷可自动进退,两层正极碳刷在使用时分别与正极环接触,两层负极碳刷在使用时分别与负极环接触。本发明的结构,实现发电和抽水时分别各自使用不同碳刷组,并分别与正极环和负极环接触形成各自的导电通路,能够防止发电与抽水时因转轴的转向变化使碳刷产生的向左或右偏移。(The invention discloses a slip ring structure of a pumped storage motor, wherein a collecting ring is axially provided with a positive electrode ring and a negative electrode ring, an insulating sleeve is arranged between the positive electrode ring and the negative electrode ring, the positive electrode ring and the negative electrode ring are in an insulating state, and the outer side of the collecting ring is provided with a carbon brush in a matching way; the carbon brushes arranged outside the positive electrode ring and the negative electrode ring in a matched mode are two layers of positive electrode carbon brushes and negative electrode carbon brushes which are distributed axially, a conductive path is formed when the positive electrode carbon brushes are in contact with the positive electrode ring, and a conductive path is formed when the negative electrode carbon brushes are in contact with the negative electrode ring; the positive carbon brush and the negative carbon brush can automatically advance and retreat, the two layers of positive carbon brushes are respectively contacted with the positive ring when in use, and the two layers of negative carbon brushes are respectively contacted with the negative ring when in use. The structure of the invention realizes that different carbon brush groups are respectively used during power generation and water pumping, and are respectively contacted with the positive electrode ring and the negative electrode ring to form respective conductive paths, so that the left or right deviation of the carbon brush caused by the steering change of the rotating shaft during power generation and water pumping can be prevented.)

1. A slip ring structure of a pumped storage motor comprises a collecting ring (1), wherein the collecting ring (1) is axially provided with two circular rings, one is a positive ring (11), the other is a negative ring (12), an insulating sleeve (3) is arranged between the positive ring (11) and the negative ring (12) to enable the positive ring and the negative ring to be in an insulating state, and a carbon brush (2) is arranged on the outer side of the collecting ring (1) in a matching manner; the carbon brush (2) arranged outside the positive electrode ring (11) in a matching mode is two layers of positive electrode carbon brushes (21) distributed in the axial direction, and a conductive path is formed when the positive electrode carbon brushes (21) are in contact with the positive electrode ring (11); the carbon brush (2) is arranged on the outer side of the negative pole ring (12) in a matching mode, the carbon brush (2) is two layers of negative pole carbon brushes (22) which are distributed in the axial direction, and a conductive path is formed when the negative pole carbon brushes (22) are in contact with the negative pole ring (12); the positive carbon brush (21) and the negative carbon brush (22) are movable, the two layers of positive carbon brushes (21) are respectively contacted with the positive ring (11) when in use, and the two layers of negative carbon brushes (22) are respectively contacted with the negative ring (12) when in use.

2. The slip ring structure of the pumped storage motor according to claim 1, wherein each of the positive carbon brush (21) and the negative carbon brush (22) is connected to a carbon brush moving device and is driven by the carbon brush moving device to move back and forth.

3. The pumped-storage electromechanical slip ring structure according to claim 1 or 2, characterized in that positive

The thickness of the polar ring (11) is not less than the sum of the thicknesses of the two positive carbon brushes (21).

4. The slip ring structure of the pumped storage motor according to claim 1 or 2, wherein the positive ring (11) is axially provided with a first positive ring piece (111) and a second positive ring piece (112) which are communicated with each other, and the first positive ring piece (111) and the second positive ring piece (112) respectively correspond to the thickness of one layer of positive carbon brushes (21) and are respectively in contact with one layer of positive carbon brushes (21); the negative pole ring (12) is axially provided with a first negative pole ring piece (121) and a second negative pole ring piece (122) which are communicated with each other, and the first negative pole ring piece (121) and the second negative pole ring piece (122) respectively correspond to the thickness of the layer of negative pole carbon brush (22) and are respectively contacted with the layer of negative pole carbon brush (22).

5. The slip ring structure of the pumped-storage motor according to claim 4, wherein the two positive ring segments and the two negative ring segments are connected and conducted through copper bars.

6. The slip ring structure of a pumped-storage electric machine according to claim 1 or 2, characterized in that the positive rings (11) and the negative rings (12) arranged axially and downwards are connected by a plurality of circumferentially arranged insulated screws (4) and are locked and fixed by nuts (5).

Technical Field

The invention relates to a slip ring of a hydraulic generator, in particular to a slip ring structure of a generator set of a pumped storage power station.

Background

The pumped-storage hydroelectric generating set is a 'peak shifting valley filling' type hydroelectric generating set, also called an energy storage type hydropower station. The pumped storage power station pumps water to an upper reservoir by using electric energy in the low ebb period of the electric load and discharges water to a hydropower station for generating power in a lower reservoir in the peak period of the electric load. It can convert the surplus electric energy when the load of power network is low into high-value electric energy when the load of power network is high, and is also suitable for power networkFrequency modulation、Phase modulationThe frequency and voltage of the power system are stabilized, the system is suitable for emergency standby, and the efficiency of a fire power station and a nuclear power station in the system can be improved.

The pumped storage unit of the existing pumped storage power station is provided with a single turbine structure, the steering of the unit can be changed when the pumped storage and the power generation are carried out, and the rotating directions of the rotating shafts are opposite; if the rotating direction of the rotating shaft is clockwise when power generation is set, the rotating direction of the rotating shaft is anticlockwise when water is pumped; the rotating shaft drives the collecting ring to synchronously rotate in the same direction; normally, a carbon brush of a slip ring system of the motor is in movable contact with a collector ring, and when a rotation direction of the collector ring is changed from a clockwise direction to a counterclockwise direction or from the counterclockwise direction to the clockwise direction, the carbon brush is angularly displaced along with the rotation direction of the collector ring. As shown in fig. 1, 2 and 3, with the change of the rotation direction of the collecting rings, the carbon brush 10 is changed from the direction vertical to the collecting rings 11 to be deviated to the left or right, and the leftward or right deviation angle of the carbon brush can reach 1 degree at most, and can also reach about 0.5 degree generally; because the carbon brush 10 is not in a vertical contact relationship with the collecting ring 11 after being deviated leftwards or rightwards, the contact surface between the carbon brush and the collecting ring is reduced, the resistance between the carbon brush and the collecting ring is firstly changed, and the resistance change between the carbon brush and the collecting ring is irregular and randomly changed; secondly, large abrasion is locally generated between the carbon brush and the collector ring to form a plurality of large or small abrasion surfaces, so that the contact surface between the carbon brush and the collector ring is changed disadvantageously; more seriously, the carbon brush or the slip ring may have linear contact with each other, which increases the current density, easily causes overheating of the carbon brush, and generates a sparking phenomenon, which may adversely act on the carbon brush or the slip ring, thereby accelerating the wear of the carbon brush or the slip ring, and reducing the service life of the carbon brush or the slip ring.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a water pumping energy storage motor slip ring structure which can prevent the carbon brush from shifting left or right due to the steering change of the collecting ring during power generation and water pumping and respectively use different carbon brushes during power generation and water pumping.

In order to solve the technical problems, the invention adopts the following technical scheme:

the slip ring structure of the pumped storage motor comprises a collecting ring, wherein the collecting ring is axially provided with two circular rings, one is a positive ring, the other is a negative ring, an insulating sleeve is arranged between the positive ring and the negative ring to ensure that the positive ring and the negative ring are in an insulating state, and a carbon brush is arranged outside the collecting ring in a matched manner; the carbon brushes are axially distributed and form a conductive path when contacting with the anode ring; carbon brushes are arranged on the outer sides of the negative pole rings in a matching mode, the carbon brushes are two layers of negative pole carbon brushes which are distributed axially, and a conductive path is formed when the negative pole carbon brushes are in contact with the negative pole rings; the positive carbon brush and the negative carbon brush can automatically advance and retreat, the two layers of positive carbon brushes are respectively contacted with the positive ring when in use, and the two layers of negative carbon brushes are respectively contacted with the negative ring when in use.

By adopting the structure, different carbon brush groups are respectively used during power generation and water pumping, and are respectively contacted with the positive electrode ring and the negative electrode ring to form respective conductive paths, so that the left or right deviation of the carbon brushes caused by the steering change of the rotating shaft during power generation and water pumping can be prevented.

Furthermore, each positive carbon brush and each negative carbon brush are respectively connected with a carbon brush moving device and can move in a reciprocating manner under the driving of the carbon brush moving device. Therefore, the movement of the anode carbon brush and the cathode carbon brush is conveniently, quickly and automatically controlled, and the efficiency of the whole machine is improved.

Further, the thickness of the positive electrode ring is not less than the sum of the thicknesses of the two positive electrode carbon brushes. Thus, can

So that the two positive carbon brushes maintain good contact with the positive ring.

Furthermore, the positive electrode ring is axially provided with a first positive electrode ring piece and a second positive electrode ring piece which are communicated with each other, and the first positive electrode ring piece and the second positive electrode ring piece respectively correspond to the thickness of one positive electrode carbon brush and are respectively contacted with one positive electrode carbon brush; the negative pole ring is axially provided with a first negative pole ring piece and a second negative pole ring piece which are communicated with each other, and the first negative pole ring piece and the second negative pole ring piece respectively correspond to the thickness of one negative pole carbon brush and are respectively contacted with one negative pole carbon brush.

Furthermore, the two anode ring pieces and the two cathode ring pieces are connected and conducted through copper bars.

Furthermore, the positive electrode ring and the negative electrode ring which are arranged up and down in the axial direction are connected through a plurality of insulating screw rods which are circumferentially arranged and are locked and fixed through nuts.

In a word, the slip ring structure of the pumped storage motor has the following beneficial effects:

1. different carbon brush groups are respectively used during power generation and water pumping, so that the carbon brushes can be prevented from shifting left or right due to the steering change of the rotating shaft during power generation and water pumping;

2. the number of electrified carbon brushes can be adjusted in real time;

3. the angle deviation between the carbon brush and the collecting ring is effectively prevented, the contact area between the carbon brush and the collecting ring is prevented from being reduced, and the contact area between the carbon brush and the collecting ring is ensured to be within the range of the process requirement; particularly, the unfavorable condition of linear contact between the carbon brush and the current collecting ring can be avoided;

4. the carbon brush is prevented from overheating and striking sparks, and high temperature is locally generated;

5. prevent the carbon brush wearing and tearing too fast, prolong its life.

Drawings

FIG. 1 is a schematic structural view of a carbon brush and a collector ring in a vertical state in the prior art;

fig. 2 is a schematic structural diagram of a carbon brush in a rightward offset state when the collector ring rotates clockwise in the prior art;

FIG. 3 is a schematic structural diagram of a carbon brush in a left-shifted state when a slip ring rotates counterclockwise in the prior art;

fig. 4 is a schematic view of a first embodiment of a carbon brush and slip ring matching structure according to the invention;

FIG. 5 is a schematic view showing another operation state of the first embodiment;

fig. 6 is a schematic view of a second embodiment of a carbon brush and collector ring matching structure according to the invention;

FIG. 7 is a schematic view showing the operation state of the second embodiment.

In the figure: 1-current collecting ring, 2-carbon brush, 3-insulating sleeve, 4-insulating screw rod, 5-nut, 11-positive pole ring, 12-negative pole ring, 21-positive pole carbon brush and 22-negative pole carbon brush.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

As shown in fig. 4, 5, 6, and 7, the slip ring structure of the pumped storage motor provided by the invention includes a collecting ring 1, the collecting ring 1 is axially provided with two rings, one is a positive ring 11, a second negative ring 12, an insulating sleeve 3 is provided between the positive ring 11 and the negative ring 12 to ensure that the two rings are in an insulating state, and a carbon brush 2 is provided outside the collecting ring 1 in a matching manner; the carbon brushes 2 arranged outside the positive electrode ring 11 in a matched mode are two layers of positive electrode carbon brushes 21 distributed in the axial direction, namely two positive electrode carbon brushes 21 arranged up and down in the axial direction, and a conductive path is formed when the positive electrode carbon brushes 21 are in contact with the positive electrode ring 11; the carbon brushes 2 are arranged outside the negative pole ring 12 in a matching mode, the carbon brushes 2 are two layers of negative pole carbon brushes 22 which are distributed axially, namely two negative pole carbon brushes 22 which are arranged axially up and down, and a conductive path is formed when the negative pole carbon brushes 22 are in contact with the negative pole ring 12;

the positive carbon brush 21 and the negative carbon brush 22 are movable, that is, can move forward and backward automatically, the two layers of axially distributed positive carbon brushes 21 are respectively contacted with the positive electrode ring 11 when in use, and the two layers of axially distributed positive carbon brushes 22 are respectively contacted with the negative electrode ring 12 when in use, so that a conductive path is formed.

As a further improvement, each of the positive carbon brush 21 and the negative carbon brush 22 is connected with a carbon brush moving device, and can move back and forth in a reciprocating manner under the driving of the carbon brush moving device to realize automatic advance and retreat, and each of the positive carbon brushes 21 is close to the positive electrode ring 11 and is in contact with the positive electrode ring or is far away from the positive electrode ring 11 and is out of contact with the positive electrode ring; each negative carbon brush 22 is brought into contact close to the negative electrode ring 12 or out of contact away from the negative electrode ring 12, respectively.

The positive electrode ring 11 and the negative electrode ring 12 which are arranged up and down in the axial direction are connected through a plurality of insulating screw rods 4 which are circumferentially arranged and are locked and fixed through nuts 5.

In the first embodiment shown in fig. 4 and 5, the positive electrode ring 11 corresponds to the two layers of positive electrode carbon brushes 21 in the axial direction, the negative electrode ring 12 corresponds to the two layers of negative electrode carbon brushes 22 in the axial direction, that is, the thickness of the positive electrode ring 11 is not less than (greater than or equal to) the sum of the thicknesses of the two layers of positive electrode carbon brushes 21, and the two positive electrode carbon brushes 21 are respectively in contact with the outer surfaces of the positive electrode ring 11.

As shown in fig. 6 and 7, in the second embodiment, the positive electrode ring 11 is axially disposed as two positive electrode ring pieces, namely a first positive electrode ring piece 111 and a second positive electrode ring piece 112, which are communicated with each other, and the first positive electrode ring piece 111 and the second positive electrode ring piece 112 respectively correspond to the thickness of one positive electrode carbon brush 21, and the thickness of the first positive electrode ring piece 111 and the second positive electrode ring piece 112 is not less than the thickness of one positive electrode carbon brush 21, and are respectively in contact with one positive electrode carbon brush 21; the negative electrode ring 12 is axially provided with two negative electrode ring pieces, namely a first negative electrode ring piece 121 and a second negative electrode ring piece 122, which are communicated with each other, the first negative electrode ring piece 121 and the second negative electrode ring piece 122 correspond to the thickness of the negative electrode carbon brush 22 respectively, the thickness of the first negative electrode ring piece 121 and the thickness of the second negative electrode ring piece 122 are not less than the thickness of the negative electrode carbon brush 22, and the first negative electrode ring piece and the second negative electrode ring piece are in contact with. And the two anode ring pieces and the two cathode ring pieces are connected and conducted through copper bars or directly connected and conducted.

The carbon brush moving device for driving the carbon brush to move can have various structures; the invention provides a specific structure, which is a Chinese invention patent with the patent number ZL201610650563.4, namely an automatic moving device of a carbon brush assembly of a generator, which is applied by the inventor before; or only the mechanical structure part of the automatic moving device of the carbon brush assembly of the generator is adopted, and the control part does not adopt a control structure that a temperature sensor and a current sensor are arranged on a carbon brush and respectively transmit a temperature signal and a current signal to a PLC control device, but adopts an electric control structure suitable for two working conditions of water pumping and power generation.

The working principle of the invention is as follows: aiming at different working conditions of water pumping and power generation of the motor, because the rotating directions of the rotating shaft of the motor are opposite during water pumping and power generation, in the first embodiment and the second embodiment of the invention, two layers (or more than two layers, the number of the two layers can be correspondingly increased according to the actual power of the motor and the like) of the positive carbon brush 21 and two layers of the negative carbon brushes 22 are arranged in a vertical layered manner, and the two layers can also be driven by the carbon brush moving device to move, so that one set of carbon brushes can be used during water pumping, the other set of carbon brushes can be used during power generation, the carbon brushes are effectively prevented from shifting caused by positive and negative rotation of the collector ring, the contact areas of the carbon brushes and the collector ring are prevented from being reduced, and.

The working process of the invention is as follows: aiming at different working conditions of water pumping and power generation of the motor, when the motor is in a power generation working condition, a group of carbon brushes 2 shown in the figure, namely a positive carbon brush 21 and a negative carbon brush 22 (A1 and A2 in the figure) are adopted to form a conductive path which is only matched with the collector ring in a forward rotation state (such as clockwise rotation); when the water pumping device is in a water pumping working condition, another group of carbon brushes 2 shown in the figure, namely another positive carbon brush 21 and another negative carbon brush 22 (in the figures, B1 and B2) are adopted to form a conductive loop, and the conductive loop is only matched with the collector ring in a reverse rotation state (for example, anticlockwise rotation); the carbon brush of the present invention is defined as two groups, one group being engaged with only the clockwise-rotating slip rings (a 1 and a 2), and the other group being engaged with only the counterclockwise-rotating slip rings (B1 and B2).

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.