Collector ring carbon powder blowing device and generator

Abstract

The invention relates to the technical field of generators, in particular to a collecting ring carbon powder blowing device and a generator, the collecting ring carbon powder blowing device comprises a blowing assembly and an electromagnetic valve group, the blowing assembly comprises a blowing pipe and a blowing nozzle, the blowing pipe is suitable for being installed on an oil receiver and is arranged opposite to a collecting ring, and the electromagnetic valve group is arranged on the blowing nozzle. An air inlet is formed in the peripheral surface of the purging pipe, the air inlet is suitable for being communicated with a purging source, the purging nozzle is arranged on the purging pipe and can rotate relative to the purging pipe, the purging nozzle is used for purging the collecting ring, the electromagnetic valve group comprises a first electromagnetic valve and a second electromagnetic valve, one end of the first electromagnetic valve is communicated with the purging source, and the other end of the first electromagnetic valve is communicated with the purging source. The other end of the first electromagnetic valve is communicated with the air inlet, one end of the second electromagnetic valve is connected with the purging pipe, and the other end of the second electromagnetic valve is connected with the purging sprayer. According to the collector ring carbon powder purging device provided by the embodiment of the invention, the collector ring can be conveniently purged, and the purging efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of generators, and in particular to a collector ring carbon powder blowing device and a generator. Background Art

[0002] The collector ring system is located in the collector ring chamber between the upper guide bearing and the oil receiver, and a large amount of oil mist will be generated during the operation of the two. In particular, the oil mist in the slip ring chamber of the axial-flow propeller turbine generator is large, which adheres to the rotor collector ring, busbar, mounting screw and main insulation, causing carbon powder to accumulate on the surface of the insulator of the generator slip ring system, resulting in an increase in the leakage current of the rotor main insulation and a decrease in insulation strength.

[0003] In the related technologies, an air duct is often set on the blower and insulated. The worker wears insulating gloves and moves the air duct to the top of the collector ring for purging. However, during the operation of the generator set, the collector ring is in a rotating state, which increases the difficulty of purging and the purging efficiency is low. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a carbon powder purging device for a collector ring, which facilitates purging of the collector ring and improves purging efficiency.

[0005] The embodiment of the present invention further provides a generator.

[0006] The carbon powder purging device for a collector ring according to an embodiment of the present invention comprises: a purging assembly, wherein the purging assembly comprises a purging pipe and a purging nozzle, wherein the purging pipe is suitable for being installed on an oil receiver and arranged opposite to the collector ring, an air inlet is provided on the outer peripheral surface of the purging pipe, and the air inlet is suitable for being connected to a purging source, the purging nozzle is provided on the purging pipe and is rotatable relative to the purging pipe, and the purging nozzle is used for purging the collector ring; and a solenoid valve group, wherein the solenoid valve group comprises a first solenoid valve and a second solenoid valve, wherein one end of the first solenoid valve is connected to the purging source, and the other end of the first solenoid valve is connected to the air inlet, one end of the second solenoid valve is connected to the purging pipe, and the other end of the second solenoid valve is connected to the purging nozzle.

[0007] The carbon powder blowing device for the collector ring of the embodiment of the present invention facilitates blowing of the collector ring and improves blowing efficiency.

[0008] In some embodiments, the purge tube is a purge ring tube, which is coaxially arranged with the collector ring and spaced apart from the collector ring in the axial direction of the collector ring. The purge nozzle is provided on the purge ring tube and the spraying direction of the purge nozzle is toward the collector ring.

[0009] In some embodiments, the collector ring carbon powder purging device also includes a driving member, which is connected to the purge ring tube, and the purge nozzle is hinged to the purge ring tube, and the driving member is used to drive the purge nozzle to rotate circumferentially around the purge ring tube relative to the purge ring tube.

[0010] In some embodiments, the collector ring carbon powder purging device also includes a pressure sensor, which includes a first pressure sensor and a second pressure sensor. In the flow direction of the gas, the first pressure sensor is located upstream of the first solenoid valve, and the second pressure sensor is located downstream of the first solenoid valve.

[0011] In some embodiments, the pressure sensor further includes at least one third pressure sensor, and the third pressure sensor is disposed on the purge ring tube, and the third pressure sensor is used to detect the gas pressure in the purge ring tube.

[0012] In some embodiments, the collector ring carbon powder blowing device also includes a controller, which is respectively connected to the drive member, the solenoid valve group, and the pressure sensor. The controller is used to receive and display the pressure value detected by the pressure sensor, and control the working status of the first solenoid valve, the second solenoid valve and the drive member.

[0013] In some embodiments, the collector ring carbon powder purging device also includes an air intake pipe, one end of which is connected to the purge ring pipe and communicated with the air inlet, and the other end of the air intake pipe is communicated with the purge source, and the first solenoid valve, the first pressure sensor and the second pressure sensor are all arranged on the air intake pipe.

[0014] In some embodiments, there are multiple purge nozzles, and the multiple purge nozzles are arranged at intervals in the circumferential direction of the purge ring tube.

[0015] In some embodiments, the circumferential spacing between two adjacent purge nozzles among the plurality of purge nozzles is 30cm-50cm; and / or, there are multiple second solenoid valves, and the multiple second solenoid valves are arranged one-to-one with the multiple purge nozzles.

[0016] The generator according to the embodiment of the present invention comprises the collector ring carbon powder blowing device according to any one of the above embodiments.

[0017] The generator according to the embodiment of the present invention facilitates the purging of the slip ring and improves the purging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a collector ring carbon powder purging device according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] Slip ring 100,

[0021] Purge assembly 1, purge pipe 11, air inlet 111, purge nozzle 12,

[0022] Solenoid valve group 2, first solenoid valve 21, second solenoid valve 22,

[0023] Pressure sensor 3 , first pressure sensor 31 , second pressure sensor 32 , third pressure sensor 33 , intake pipe 4 . DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] It should be noted that the single-point grounding fault of the generator rotor circuit is a common fault form of the generator, which generally does not cause harm to the generator. However, once the rotor is grounded at two points, it will not only seriously burn the rotor winding, but also distort the rotor magnetic field, aggravate the vibration of the unit, and especially the axial current may burn the bearings and the main shaft, causing the turbine blades to be magnetized and causing irreversible consequences. The single-point grounding of the generator rotor can be detected by the single-point grounding device of the generator rotor. The detection data are as follows: the generator rotor voltage is 240V, the positive rotor voltage to the ground is about 128.8V, the negative rotor voltage to the ground is about -113.2V, the rotor grounding resistance jumps between 253 and 300kΩ, the rotor grounding position is 15.8%, the leakage current 1 is -0.286mA, and the leakage current 2 is -0.124mA. From the data analysis of the above generator rotor grounding resistance and the negative rotor voltage to the ground, it is obvious that the insulation of the negative pole of the rotor is lower than that of the positive pole.

[0026] The normal value of the rotor grounding resistance is 300kΩ. When the rotor grounding resistance is less than the set value, the generator rotor grounding device sends an alarm signal. For example, the set value is 20.00kΩ.

[0027] When the generator outgoing line is grounded at one point, it is necessary to inspect the primary and secondary equipment of the generator rotor. The inspection results are as follows: the excitation system is checked for faults, the rotor grounding protection device functions normally, the positive and negative carbon brushes in the slip ring chamber operate normally, some carbon powder is accumulated on the upper surface of the negative collector ring, some carbon powder particles adhere to the metal rod and the inner surface of the sheath of the upper load-bearing tie rod of the negative collector ring, and some carbon powder adheres to the surface of the negative excitation cable. At the same time, there is oil leakage in the observation window of the No. 3 oil receiver, and the oil droplets will drip into the collector ring 100, thereby aggravating the accumulation of carbon powder. Through inspection, it was found that the wear of the negative carbon brush is greater than that of the positive electrode. Due to the irregular slideway on the surface of the negative collector ring 100, the carbon powder generated by the negative carbon brush is not only absorbed by the carbon powder dust collection device, but also accumulated on the negative collector ring 100, the sheath surface of the collector ring tightening screw, and the excitation cable.

[0028] The reasons for the above situation are as follows: carbon powder particles adhere to the metal rod of the upper load-bearing tie rod of the negative bus ring and the surface of the insulating sleeve, resulting in reduced insulation of the insulating sleeve and the insulating tube, causing the negative bus ring to be grounded and the grounding resistance of the generator rotor to be reduced. After on-site inspection, the carbon powder adhesion is not much compared with the carbon powder accumulation during the rotor grounding alarm last year. In addition, the metal rod was modified during the maintenance period this year, and an insulating tube cover was installed on the outside for protection. The insulation performance of the carbon powder has been greatly improved. Therefore, the possibility of insulation reduction here is relatively small.

[0029] There is carbon powder particle adhesion and accumulation on the support screw and insulating pad of the negative collector ring 100, resulting in the formation of a grounding loop between the negative collector ring, collector ring 100 and the main shaft, and the grounding resistance of the generator rotor is reduced. Since the generator is running, it is impossible to check the internal carbon powder accumulation. According to the previous treatment of the generator carbon powder accumulation, the oil drop point of the generator oil receiver is just above the support bolt of the negative collector ring 100, and the oil seepage flows along the support bolt of the collector ring 100 to the middle sheath. Therefore, it is judged that there is a high probability of carbon powder adhesion and accumulation on the support screw of the negative collector ring 100 and the middle sheath of the negative collector ring 100 support. Since the support screw of the collector ring 100 is connected to the rotating support plate of the main shaft, the insulating sleeve between the negative collector ring 100 and the upper end nut of the support screw is 30mm, which is close. If the carbon powder accumulation of the insulating sleeve is serious, it is easy to cause the negative collector ring 100 to form a grounding loop with the main shaft, resulting in a decrease in rotor resistance. Considering that the insulating paint at the middle sheath of the supporting bolt of the negative collector ring 100 is intact and the insulating sheath is 50mm, the negative collector ring 100 is far away from the main shaft, and it is unlikely that the negative collector ring 100 will be grounded with the main shaft due to the accumulation of carbon powder, so it is preliminarily judged that the grounding position is the nut at the upper end of the supporting screw of the negative collector ring 100. The present invention is designed based on the above findings.

[0030] The carbon powder purging device for the collector ring 100 of the embodiment of the present invention comprises a purging assembly 1 and a solenoid valve group 2. The purging assembly 1 comprises a purging pipe 11 and a purging nozzle 12. The purging pipe 11 is suitable for being installed on the oil receiver and arranged opposite to the collector ring 100. An air inlet 111 is provided on the outer peripheral surface of the purging pipe 11. The air inlet 111 is suitable for being connected to a purging source. The purging nozzle 12 is provided on the purging pipe 11 and is rotatable relative to the purging pipe 11. The purging nozzle 12 is used to purge the collector ring 100. The solenoid valve group 2 comprises a first solenoid valve 21 and a second solenoid valve 22. One end of the first solenoid valve 21 is connected to the purging source, and the other end of the first solenoid valve 21 is connected to the air inlet 111. One end of the second solenoid valve 22 is connected to the purging pipe 11, and the other end of the second solenoid valve 22 is connected to the purging nozzle 12.

[0031] Specifically, Figure 1 As shown, the purge pipe 11 is installed on the oil receiver base. When the generator is running, the collector ring 100 is in a rotating state and the oil receiver is in a stationary state. By installing the purge pipe 11 on the oil receiver base, it is convenient for the purge pipe 11 to purge the rotating collector ring 100. The purge range includes but is not limited to the insulator at the top of the collector ring 100 supporting screw and the insulating sheath of the positive and negative ring tensioning screws.

[0032] An air inlet 111 is provided on the outer peripheral surface of the purge tube 11 to facilitate the delivery of the purge gas into the purge tube 11. The purge nozzle 12 is connected to the purge tube 11 and transmits the purge gas in the purge tube 11 to the purge nozzle 12. The collector ring 100 is purged by the purge nozzle 12. During the purge process, the purge nozzle 12 is rotated relative to the purge tube 11 to achieve a larger range of purge.

[0033] By setting the first solenoid valve 21, the pressure of the purge source is monitored in real time, and by setting the second solenoid valve 22, the gas pressure in the purge pipe 11 is monitored in real time, so as to facilitate adjustment of the pressure of the purge source and the gas pressure in the purge pipe 11 to ensure the purge effect.

[0034] For example, the purge pipe 11 is fixed to the oil receiver base by welding, or the purge pipe 11 is fixed to the oil receiver base by bolts.

[0035] For example, the purge pipe 11 is a stainless steel pipe, and the purge source is maintenance gas, which can be obtained by connecting with a system for generating on-site maintenance gas.

[0036] The carbon powder purging device for the collector ring 100 in the embodiment of the present invention is configured by arranging a purging pipe 11 connected to a purging source on an oil receiver base, and arranging a purging nozzle 12 on the purging pipe 11. The purging nozzle 12 sprays purging gas to purge the collector ring 100. The purging nozzle 12 rotates relative to the purging pipe 11 to increase the purging range of the purging nozzle 12. At the same time, the pressure of the purging source is monitored in real time through the first solenoid valve 21 and the gas pressure in the blowpipe is monitored in real time through the second solenoid valve 22, so as to adjust the gas pressure in time and ensure the purging effect.

[0037] Compared with the related art in which the blower and the air duct are temporarily assembled with insulating tape, it is necessary to test the insulation performance of the blower and the air duct before purging to avoid the risk of short-circuiting and grounding of the collector ring 100. In this embodiment, no temporary assembly device is required, and through the provision of the purge tube 11 and the purge nozzle 12, there is no need to check the insulation performance of the purge tube 11 before purging the collector ring 100, and there is no risk of short-circuiting and grounding of the collector ring 100, thereby improving the purging efficiency.

[0038] Compared with the setting in the related art that requires the staff to wear insulating gloves and hold the air guide tube to extend it above the negative pole support screw bolt for purging, in this embodiment, the purging tube 11 is fixedly installed on the oil receiver base. By fixing the purging tube 11, the staff can avoid hand-held operation, thereby improving the purging accuracy, and can also purge the collector ring 100 during the rotation process, thereby realizing dynamic purging and increasing the purging range of the purging nozzle 12.

[0039] Compared with the related art that requires the setting of a blower, in this embodiment, the purge source is directly introduced into the purge tube 11, so as to avoid the problem of blower heating, improve the purge efficiency, completely solve the problem of carbon powder adhesion and accumulation of the generator collector ring 100, improve the insulation resistance of the rotor during operation, reduce the leakage current of the insulating components, and effectively prevent the generator rotor from causing a single-point grounding alarm and a two-point grounding electrical short circuit risk.

[0040] Furthermore, through the setting of the purge component 1, when the grounding resistance of the generator rotor decreases and a single-point grounding alarm is sounded, the carbon powder can be purged in time by remote control to eliminate the fault, thereby reducing the risks of mechanical damage, electric shock to personnel, and rotor electrical short circuit failure caused by manual purge.

[0041] In some embodiments, the purge tube 11 is a purge ring tube, which is coaxially arranged with the collector ring 100 and spaced apart from the collector ring 100 in the axial direction of the collector ring 100 . The purge nozzle 12 is disposed on the purge ring tube and the spraying direction of the purge nozzle 12 is toward the collector ring 100 .

[0042] Specifically, Figure 1As shown, the purge ring tube is located above the collector ring 100, and the purge ring and the collector ring 100 are arranged coaxially to ensure that the purge ring tube is located directly above the collector ring 100. The purge ring tube is convenient for the installation of the purge nozzle 12 at different angles. By directing the spray direction of the purge nozzle 12 toward the collector ring 100, it is ensured that the purge nozzle 12 can be purged directly above the collector ring 100, thereby ensuring the purging effect.

[0043] Optionally, the diameter of the purge ring tube can be determined according to the diameter of the collector ring 100, so as to achieve the purging of carbon powder and dust on different collector rings 100, and can also be used for cleaning work during unit maintenance.

[0044] In some embodiments, the carbon powder purging device of the collector ring 100 also includes a driving member, which is connected to the purge ring tube, and the purge nozzle 12 is hinged to the purge ring tube. The driving member is used to drive the purge nozzle 12 to rotate circumferentially around the purge ring tube relative to the purge ring tube, thereby changing the flow direction of the maintenance air and achieving dead-angle purging of carbon powder and dust from the generator collector ring 100.

[0045] Optionally, the driving member is a push rod, one end of which is connected to the purge ring tube, and the other end of the push rod is connected to an end of the purge nozzle 12 away from the purge ring tube. Since the purge nozzle 12 is hinged to the purge ring tube, the push rod pushes the purge nozzle 12 to rotate circumferentially around the purge ring tube, thereby increasing the purge range of the purge nozzle 12.

[0046] For example, the circumferential rotation angle range of the purge nozzle 12 around the purge ring tube is 180°, and the spraying direction of the purge nozzle 12 can be switched between the horizontal direction and the vertical direction to meet the requirements of purging carbon powder at different points in the same area of ​​the collector ring 100.

[0047] In some embodiments, the carbon powder purging device of the collector ring 100 also includes a pressure sensor 3, which includes a first pressure sensor 31 and a second pressure sensor 32. In the flow direction of the gas, the first pressure sensor 31 is located upstream of the first solenoid valve 21, and the second pressure sensor 32 is located downstream of the first solenoid valve 21.

[0048] Specifically, Figure 1 As shown, the first pressure sensor 31 is arranged at the inlet end of the first solenoid valve 21, and the first pressure sensor 31 is used to detect the pressure of the purge source. The second pressure sensor 32 is arranged at the outlet end of the first solenoid valve 21, and the second pressure sensor 32 is used to detect the gas pressure in the purge ring tube, so as to grasp the gas flow situation and adjust the gas pressure in time according to the purge demand.

[0049] In some embodiments, the pressure sensor 3 further includes at least one third pressure sensor 33 . The third pressure sensor 33 is disposed on the purge ring tube. The third pressure sensor 33 is used to detect the gas pressure in the purge ring tube.

[0050] Specifically, Figure 1 As shown, there are multiple third pressure sensors 33, for example, there are two third pressure sensors 33, the two third pressure sensors 33 are symmetrically arranged on the purge ring tube, and are arranged at intervals from the air inlet 111, one of the third pressure sensors 33 is used to detect the pressure on one side of the purge ring tube, and the other third pressure sensor 33 is used to detect the pressure on the other side of the purge ring tube. Through the setting of the third pressure sensor 33, it is convenient to obtain the gas pressure at different positions of the purge ring tube in real time.

[0051] In some embodiments, the carbon powder purging device of the collector ring 100 further includes a controller, which is respectively connected to the driving member, the solenoid valve group 2, and the pressure sensor 3. The controller is used to receive and display the pressure value detected by the pressure sensor 3, and control the working state of the first solenoid valve 21, the second solenoid valve 22, and the driving member. Through the setting of the controller, it is convenient to obtain the gas pressure, control the opening and closing of the first solenoid valve 21 and the second solenoid valve 22, and also control the purging angle of the purging nozzle 12 to achieve remote adjustment.

[0052] Optionally, the initial state of the first solenoid valve 21 and the second solenoid valve 22 is a closed state. When the collector ring 100 needs to be purged, the controller controls the first solenoid valve 21 and the second solenoid valve 22 to open to facilitate the purge gas to enter the purge pipe 11 and the purge nozzle 12.

[0053] Optionally, the pressure sensor 3 displays an analog value, and the controller supplies power to the first solenoid valve 21 , the second solenoid valve 22 and the driving element at the same time.

[0054] In some embodiments, Figure 1 As shown, the carbon powder purging device of the collector ring 100 also includes an intake pipe 4, one end of which is connected to the purge ring pipe and communicated with the air inlet 111, and the other end of the intake pipe 4 is communicated with the purge source, and the first solenoid valve 21, the first pressure sensor 31 and the second pressure sensor 32 are all arranged on the intake pipe 4. The first pressure sensor 31, the first solenoid valve 21 and the second pressure sensor 32 are arranged in sequence in the axial direction of the intake pipe 4 along the direction close to the purge ring pipe. The arrangement of the intake pipe 4 facilitates the connection between the purge ring pipe and the purge source, and facilitates the installation of the first solenoid valve 21, the first pressure sensor 31 and the second pressure sensor 32.

[0055] In some embodiments, there are multiple purge nozzles 12 , and the multiple purge nozzles 12 are spaced apart in the circumferential direction of the purge ring tube.

[0056] Specifically, Figure 1 As shown, multiple purge nozzles 12 are evenly spaced around the circumference of the purge ring tube. By setting up multiple purge nozzles 12, the negative pressure at the air inlet of the carbon powder purge device of the collector ring 100 is increased, the absorption efficiency of the carbon powder purge device of the collector ring 100 is improved, and the oil and carbon powder pollution rate of the generator slip ring system is reduced.

[0057] Optionally, there are 12 purge nozzles 12.

[0058] In some embodiments, the spacing distance between two adjacent purge nozzles 12 in the circumferential direction of the purge ring tube is 30 cm-50 cm. By limiting the spacing distance between two adjacent purge nozzles 12 in the circumferential direction of the purge ring tube, it is ensured that the purge range of the purge nozzle 12 in the circumferential direction of the purge ring tube can cover the collector ring 100, so as to achieve all-round and no-dead-angle purge of the collector ring 100.

[0059] Optionally, the spacing between two adjacent purge nozzles 12 in the circumferential direction of the purge ring tube is 40 cm.

[0060] In some embodiments, there are multiple second solenoid valves 22, and the multiple second solenoid valves 22 are arranged in a one-to-one correspondence with the multiple purge nozzles 12. Through the arrangement of the multiple second solenoid valves 22, each solenoid valve can be individually controlled to determine the opening and closing of each purge nozzle 12, thereby adjusting the working state of each purge nozzle 12.

[0061] Optionally, when the slip ring 100 is in a stationary state and a certain area of ​​the slip ring 100 needs to be purged, the partial area of ​​the slip ring 100 can be purged by opening the second solenoid valve 22 of the purging nozzle 12 corresponding to the area.

[0062] The generator according to the embodiment of the present invention comprises a carbon powder blowing device for the slip ring 100 according to any one of the above embodiments.

[0063] The generator in the embodiment of the present invention is provided with a purge pipe 11 connected to a purge source on the oil receiver base, and a purge nozzle 12 is provided on the purge pipe 11. The purge nozzle 12 sprays purge gas to purge the collector ring 100. The purge nozzle 12 rotates relative to the purge pipe 11 to increase the purge range of the purge nozzle 12. At the same time, the pressure of the purge source is monitored in real time through the first solenoid valve 21 and the gas pressure in the blowpipe is monitored in real time through the second solenoid valve 22, so as to adjust the gas pressure in time and ensure the purge effect. In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] It is to be understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A collector ring carbon powder purging device, characterized in that: include: A purge assembly, the purge assembly comprising a purge pipe and a purge nozzle, the purge pipe is suitable for being installed on the oil receiver and arranged opposite to the collector ring, an air inlet is provided on the outer peripheral surface of the purge pipe, the air inlet is suitable for being connected to a purge source, the purge nozzle is arranged on the purge pipe and is rotatable relative to the purge pipe, and the purge nozzle is used to purge the collector ring; The solenoid valve group includes a first solenoid valve and a second solenoid valve, one end of the first solenoid valve is connected to the purge source, the other end of the first solenoid valve is connected to the air inlet, one end of the second solenoid valve is connected to the purge pipe, and the other end of the second solenoid valve is connected to the purge nozzle.

2. The collector ring carbon powder purging device according to claim 1, characterized in that: The purge tube is a purge ring tube, which is coaxially arranged with the collector ring and spaced apart from the collector ring in the axial direction of the collector ring. The purge nozzle is arranged on the purge ring tube and the spraying direction of the purge nozzle is toward the collector ring.

3. The collector ring carbon powder purging device according to claim 2, characterized in that: It also includes a driving member, which is connected to the purge ring tube. The purge nozzle is hinged to the purge ring tube. The driving member is used to drive the purge nozzle to rotate around the circumference of the purge ring tube relative to the purge ring tube.

4. The collector ring carbon powder purging device according to claim 3, characterized in that: The system further comprises a pressure sensor, which comprises a first pressure sensor and a second pressure sensor. In the flow direction of the gas, the first pressure sensor is located upstream of the first solenoid valve, and the second pressure sensor is located downstream of the first solenoid valve.

5. The collector ring carbon powder purging device according to claim 4, characterized in that: The pressure sensor further includes at least one third pressure sensor, which is disposed on the purge ring tube and is used to detect the gas pressure in the purge ring tube.

6. The collector ring carbon powder purging device according to claim 5, characterized in that: It also includes a controller, which is respectively connected to the driving member, the solenoid valve group, and the pressure sensor. The controller is used to receive and display the pressure value detected by the pressure sensor and control the working status of the first solenoid valve, the second solenoid valve and the driving member.

7. The collector ring carbon powder purging device according to claim 4, characterized in that: It also includes an intake pipe, one end of which is connected to the purge ring pipe and communicated with the air inlet, and the other end of which is communicated with the purge source, and the first solenoid valve, the first pressure sensor and the second pressure sensor are all arranged on the intake pipe.

8. The collector ring carbon powder purging device according to claim 2, characterized in that: There are a plurality of purge nozzles, and the plurality of purge nozzles are arranged at intervals in the circumferential direction of the purge ring tube.

9. The collector ring carbon powder purging device according to claim 8, characterized in that: The spacing distance between two adjacent purge nozzles among the plurality of purge nozzles in the circumferential direction of the purge ring tube is 30 cm-50 cm; and / or, There are multiple second solenoid valves, and the multiple second solenoid valves are arranged in one-to-one correspondence with the multiple purge nozzles.

10. A generator, characterized in that: It comprises the collector ring carbon powder blowing device as claimed in any one of claims 1 to 9.

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