Hydro-generator set oil guide groove cover plate magnetofluid sealing comprehensive test bed

Abstract

The invention belongs to the technical field of mechanical engineering sealing, and particularly relates to a magnetofluid sealing structure of an oil guide groove cover plate of a water-turbine generator set and a comprehensive testbed. The magnetofluid sealing structure of the oil guide groove cover plate of the water-turbine generator set comprises a main shaft, a rotating shaft pole shoe assembly and a static pole shoe assembly; the rotating shaft pole shoe assembly comprises a rotating shaft pole shoe, a rotating shaft sealing boss is arranged on the lower surface of the rotating shaft pole shoe, and sealing teeth are arranged on the outer side of the rotating shaft sealing boss. The static pole shoe assembly is arranged outside the main shaft in a sleeving mode, a first ring groove and a third ring groove are formed in the upper surface of the static pole shoe assembly, magnetofluid is arranged in the first ring groove, the first ring groove is matched with the sealing teeth, the sealing teeth extend into the magnetofluid, and the third ring groove is matched with the rotating shaft sealing boss; the guide bearing oil groove cover plate of the water-turbine generator set is sealed through the magnetic fluid seal, so that the problems of oil mist overflow and main shaft abrasion are effectively solved; the comprehensive test bench is used for simulating the sealing performance of the magnetofluid seal under real working conditions.

Description

[0001] This application is a divisional application of a Chinese patent application with the application date of November 25, 2024, application number 202411688801.1, and invention title "Magnetic Fluid Sealing Structure and Comprehensive Test Bench for the Oil Guide Tank Cover of a Hydrogenerator Set". Technical Field

[0002] The present invention belongs to the technical field of mechanical engineering sealing, and particularly relates to a comprehensive test bench for the magnetic fluid sealing of the oil guide tank cover of a hydrogenerator set. Background Art

[0003] As the main equipment for hydropower generation in China, the guide bearing is a key component for the reliable operation of the shafting of a hydrogenerator set. During the operation of the unit, the oil mist formed by the loss and dispersion of the lubricating oil in the guide bearing enters key parts such as the stator core and stator bars of the unit, seriously affecting the safe and stable operation of the unit; however, at present, the sealing structures of the oil guide tank covers of hydrogenerator sets are mainly divided into two types: non-contact seals and contact seals; among them, the non-contact seal structure has poor sealing effect. After installing an oil mist absorption device, the problem of oil mist overflow is still serious; the contact seal uses polytetrafluoroethylene seals, which are extremely easy to cause wear and even scratch the rotating shaft, and the main shaft needs to be frequently repaired and the seals need to be replaced, resulting in extremely high operation and maintenance costs; at the same time, after sealing the oil guide tank cover of the hydrogenerator set, it is impossible to determine its sealing state under different working environments, and thus it is impossible to determine the sealing condition of the oil guide tank cover of the hydrogenerator set. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic liquid seal and a comprehensive test bench for the oil guide tank cover of a hydrogenerator set, which can seal the oil mist of the oil guide tank cover of the hydrogenerator set, ensure that the oil mist does not leak, and at the same time will not cause wear to the main shaft, and can detect the sealing condition of the magnetic liquid to the oil mist under different environments.

[0005] The technical solution of the present invention is as follows: A magnetic fluid sealing structure for the oil guide tank cover of a hydrogenerator set includes a main shaft, and an annular base is sleeved on the side wall of the main shaft. This magnetic fluid sealing structure further includes a rotating shaft pole shoe assembly and a static pole shoe assembly;

[0006] The rotating shaft pole shoe assembly is sleeved outside the main shaft. The rotating shaft pole shoe assembly includes four split-type rotating shaft pole shoes at equal angles. The four rotating shaft pole shoes are connected end to end to form an annular rotating shaft pole shoe assembly. An arc-shaped rotating shaft sealing boss is provided on the lower surface of each rotating shaft pole shoe, and a sealing tooth is provided on the outside of each rotating shaft sealing boss;

[0007] The static pole shoe assembly is sleeved outside the main shaft. The static pole shoe assembly is installed on the upper surface of the base. The upper surface of the annularly arranged static pole shoe assembly is provided with a first annular groove, a second annular groove and a third annular groove from outside to inside. The depths and sizes of the first annular groove, the second annular groove and the third annular groove are all different. A magnetic fluid is arranged in the first annular groove. The first annular groove is matched with a sealing tooth, and the sealing tooth extends into the interior of the magnetic fluid. The third annular groove is matched with a rotating shaft sealing boss. A placement annular groove for placing a permanent magnet is provided on the lower surface of the static pole shoe assembly. The static pole shoe assembly includes a first stationary pole shoe, a second stationary pole shoe, a third stationary pole shoe and a safety drain pole shoe connected end to end. The structures of the first stationary pole shoe, the second stationary pole shoe and the third stationary pole shoe are the same. A first channel hole is provided inside each of the first stationary pole shoe, the second stationary pole shoe and the third stationary pole shoe. A second channel hole is provided inside each of the first stationary pole shoe, the second stationary pole shoe, the third stationary pole shoe and the safety drain pole shoe. The three first channel holes and the four second channel holes are all communicated with the first annular groove. A drain channel hole is provided on the safety drain pole shoe, and one end of the drain channel hole is communicated with the second annular groove. Oil mist through holes are provided through the middle of the outer diameters of the first stationary pole shoe, the second stationary pole shoe, the third stationary pole shoe and the safety drain pole shoe. Magnetic fluid through holes are symmetrically provided on both sides of the oil mist through holes on the first stationary pole shoe, the second stationary pole shoe and the third stationary pole shoe, and the magnetic fluid through holes are respectively communicated with the first annular groove through the corresponding first channel hole or second channel hole. Magnetic fluid through holes and drain through holes are symmetrically provided on both sides of the oil mist through hole on the safety drain pole shoe. The magnetic fluid through holes on the safety drain pole shoe are communicated with the first annular groove through the second channel holes provided thereon. The drain through holes on the safety drain pole shoe are communicated with the second annular groove through the drain channel holes.

[0008] Wherein, the base includes four split base ring petals connected end to end at equal angles. An oil mist groove is provided inside each base. An oil mist internal channel is provided inside each base ring petal. One end of each oil mist internal channel is communicated with the oil mist groove, and the other end of each oil mist internal channel is communicated with the corresponding oil mist through hole.

[0009] Further, the four oil mist through holes include two oil mist detection holes and two breather valve holes. The two breather valve holes are respectively arranged at the radial two ends of the static pole shoe assembly.

[0010] Further, the seven magnetic fluid through holes include a magnetic fluid inlet, a magnetic fluid outlet, a coolant inlet, a coolant outlet and three magnetic fluid detection ports. Among them, the magnetic fluid inlet and the magnetic fluid outlet are respectively arranged at the radial two ends of the static pole shoe assembly. The coolant inlet and the coolant outlet are respectively arranged at the radial two ends of the static pole shoe assembly.

[0011] Further, one end of each of the internal oil mist channels penetrates through the outer sidewall of the base, and a plug is provided at the end of each internal oil mist channel; one end of each of the first channel holes, each of the second channel holes, and the drain channel hole penetrates through the outer sidewall of the static pole shoe assembly, and a plug is provided at the end of each of the first channel holes, each of the second channel holes, and the drain channel hole.

[0012] A comprehensive test bench for the magnetic fluid seal of the oil guiding groove cover plate of a hydro-generator set is used to detect the sealing performance between the rotating shaft pole shoe assembly and the moving pole shoe assembly in the magnetic fluid seal structure of the oil guiding groove cover plate of the above-mentioned hydro-generator set. The comprehensive test bench includes:

[0013] A support assembly, including a T-shaped table. On one side above the T-shaped table, there is a gearbox support frame, and a connection hole is provided on one side of the gearbox support frame;

[0014] A transmission system is arranged above the T-shaped table and includes a variable-frequency motor. The output end of the variable-frequency motor extends to the connection hole and is connected with a gear reduction box through an elastic coupling. The gear reduction box is arranged inside the gearbox support frame. The output shaft of the gear reduction box is connected with a torque sensor through a gearbox rotating shaft expansion sleeve. The torque sensor is connected with a diaphragm coupling through a flange connection adapter. One end of the diaphragm coupling is provided with a spline shaft expansion sleeve. Inside the spline shaft expansion sleeve, there is a spline shaft, and one end of the spline shaft is connected with the main shaft;

[0015] A bearing base is sleeved outside the main shaft. The bearing base is installed above the gearbox support frame. At the top of the bearing base, there are a base drain hole, seven first base through holes, and eight second base through holes. The first base through holes and the second base through holes are arranged at intervals. The base drain hole is arranged between the first base through holes and the second base through holes. The seven first base through holes, the eight second base through holes, and the base drain hole are evenly arranged at equal angles on the bearing base;

[0016] The oil collecting ring assembly is arranged between the main shaft and the bearing base. The oil collecting ring assembly includes a first oil collecting flap, a second oil collecting flap, a third oil collecting flap and a fourth oil collecting flap. The first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap are connected end to end to jointly form an annular oil collecting ring assembly. Oil collecting grooves are formed on the inner sides of the upper surfaces of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. Two oil collecting ring internal channels are formed inside each of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. The eight oil collecting ring internal channels are all communicated with the oil collecting grooves, and the other ends of the eight oil collecting ring internal channels are respectively communicated with the corresponding second base through holes; Two oil collecting ring through holes are respectively formed through the outer sides of the upper surfaces of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. The oil collecting ring through holes and the oil collecting ring internal channels are arranged alternately, and the oil collecting ring through holes and the oil collecting ring internal channels are evenly distributed on the annular oil collecting ring assembly. Seven of the eight oil collecting ring through holes are respectively communicated with the corresponding first base through holes, and one of the eight oil collecting ring through holes is communicated with the base drain hole;

[0017] The seal gland assembly is arranged on the top of the bearing base. The seal gland assembly includes four equally angled split seal glands. Each seal gland is provided with a gland through hole. Among them, two spaced gland through holes are respectively a dust generating device hole and a dust collecting device hole; A seal top cover is jointly connected to the tops of the four split seal glands. A leakage collection hole is formed through the middle of the seal top cover; The magneto-fluid sealing structure and the oil collecting ring assembly are both arranged inside the seal gland assembly. The three first channel holes, the four second channel holes and the drain channel hole on the static pole shoe assembly are respectively communicated with the eight oil collecting ring through holes; Among them, the drain channel hole is communicated with the base drain hole through the oil collecting ring through hole;

[0018] The heat preservation box is of a hollow structure and is arranged outside the seal gland assembly. One end of the heat preservation box is connected to the bearing base. A plurality of mounting holes are formed on the top cover of the heat preservation box. The plurality of mounting holes are respectively used for mounting a hot air inlet pipe, a hot air outlet pipe, a temperature detection pipe, a dust inlet pipe, a dust outlet pipe, a dust particle size / concentration detection pipe, a magnetic field sensor pipe and a leakage collection pipe; A magnetic field generator is arranged between the heat preservation box and the seal gland assembly. The bottom end of the magnetic field generator is connected to the bearing base;

[0019] Data acquisition system, including a magnetic field data collection part, a dust environment data collection part, an oil mist data collection part, a magnetorheological fluid data collection part, a leakage amount collection part, and a torque sensor arranged on the transmission system; the magnetic field data collection part consists of magnetic field intensity sensors, and the magnetic field sensors are installed in the cavity formed by the sealing gland and the heat preservation box through magnetic field sensor pipes; the dust data collection part consists of a dust concentration / particle size distribution sensing device and a temperature sensor, and the dust concentration / particle size distribution sensing device and the temperature sensor are respectively installed on different gland through holes by passing through the heat preservation box top cover through the dust particle size / concentration detection pipe and the temperature detection pipe; the oil mist data collection part consists of an oil mist pressure sensor, an oil mist temperature and humidity integrated sensor, and an oil mist concentration sensor, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively installed on three second base through holes on the bearing base, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively connected to the internal channel of the oil collecting ring of the oil collecting ring assembly through the second base through holes; the magnetorheological fluid data collection part consists of a magnetorheological fluid temperature sensor, a safety liquid level detection sensor, and a magnetorheological fluid viscosity sensor, and the magnetorheological fluid temperature sensor, the safety liquid level detection sensor, and the magnetorheological fluid viscosity sensor are respectively installed on three first base through holes, and the magnetorheological fluid temperature sensor, the safety liquid level detection sensor, and the magnetorheological fluid viscosity sensor are all connected to the first ring groove through the first base through holes, the oil collecting ring through holes, and the first channel holes; the leakage amount collection part includes a leakage collection container, and the leakage collection container is internally communicated with the sealing gland assembly through the leakage collection pipe on the heat preservation box and the leakage collection hole on the sealing top cover; the input end of the torque sensor is connected to the output shaft of the gear reduction box through a gearbox shaft expansion sleeve, and the output end of the torque sensor is connected to the main shaft through a flange connection adapter, a diaphragm coupling, a spline shaft expansion sleeve, and a spline shaft;

[0020] Control system, including a variable-frequency motor controller, an oil mist generator, an oil mist collection device, a dust generation device, a dust recovery device, a temperature control system, a magnetic fluid supply, replenishment and drainage automatic control system, and a magnetic fluid heat exchange system; the variable-frequency motor controller controls a variable-frequency motor installed above the T-shaped table to provide power for the rotation of the main shaft; the oil mist generator and the oil mist collection device are respectively installed on two second base through-holes, and both the oil mist generator and the oil mist collection device are connected to the oil sump through the second base hole and the internal channel of the oil collecting ring; the dust generation device and the dust recovery device respectively pass through the top cover of the heat preservation box through the dust inlet pipe and the dust outlet pipe, and are respectively installed on the dust generation device hole and the dust collection device hole; the temperature control system includes an external temperature control device, and the external temperature control device is communicated with the internal cavity of the heat preservation box through a hot air inlet pipe and a hot air outlet pipe installed on the heat preservation box; the magnetic fluid supply, replenishment and drainage automatic control system is composed of a magnetic fluid input device and a magnetic fluid recovery device, the magnetic fluid input device and the magnetic fluid recovery device are respectively installed on two of the first base through-holes, and both the magnetic fluid input device and the magnetic fluid recovery device are connected to the first annular groove through the first base through-hole, the oil collecting ring through-hole and the second channel hole; the magnetic fluid heat exchange system includes a heat exchange pipe arranged inside the first annular groove, one end of the heat exchange pipe is communicated with the first channel hole on the static pole shoe assembly, and one end of the heat exchange pipe is connected to the heat exchange inlet through the first channel hole, the oil collecting ring through-hole and the first base through-hole; the other end of the heat exchange pipe is communicated with the second channel hole on the static pole shoe assembly, and the other end of the heat exchange pipe is connected to the heat exchange outlet through the second channel hole, the oil collecting ring through-hole and the first base through-hole.

[0021] Further, the seven first base through-holes are respectively a magnetic fluid temperature hole, a magnetic fluid viscosity hole, a safety liquid level detection hole, a magnetic fluid recovery hole, a heat exchange access hole, a heat exchange outlet hole, and a magnetic fluid input hole, and the seven first base through-holes are circumferentially arranged at the top end of the bearing base; the eight second base through-holes are respectively an oil mist generation hole, an oil mist temperature and humidity connection hole, an oil mist pressure detection hole, a first breather valve hole, an oil mist collection hole, an oil mist pressure safety hole, an oil mist concentration detection hole, and a second breather valve hole, and the eight second base through-holes are circumferentially arranged at the top end of the bearing base.

[0022] Further, breather valves are provided on both the first breather valve hole and the second breather valve hole, the first breather valve hole and the second breather valve hole are respectively arranged at the radial two ends of the bearing base, the magnetic fluid input hole and the magnetic fluid recovery hole are respectively arranged at the radial two ends of the bearing base, and the heat exchange access hole and the heat exchange outlet hole are respectively arranged at the radial two ends of the bearing base.

[0023] Furthermore, the oil mist pressure sensor is disposed on the oil mist pressure detection hole. The oil mist pressure sensor detects the oil mist pressure inside the guide oil groove cover plate of the water turbine generator set through the oil mist pressure detection hole and the internal channel of the oil collecting ring. The integrated oil mist temperature and humidity sensor is disposed on the oil mist temperature and humidity connection hole. The integrated oil mist temperature and humidity sensor detects the temperature and humidity of the oil mist inside the guide oil groove cover plate of the water turbine generator set through the oil mist temperature and humidity detection hole and the internal channel of the oil collecting ring. The oil mist concentration sensor is disposed on the oil mist concentration detection hole. The oil mist concentration sensor detects the concentration of the oil mist inside the guide oil groove cover plate of the water turbine generator set through the oil mist concentration detection hole and the internal channel of the oil collecting ring. The oil mist generator is disposed on the oil mist generation hole. The oil mist generated by the oil mist generator is input into the inside of the guide oil groove cover plate of the water turbine generator set through the oil mist generation hole and the internal channel of the oil collecting ring. The oil mist collecting device is disposed on the oil mist collecting hole. The oil mist collecting device ensures that the oil mist can be discharged from the inside of the guide oil groove cover plate of the water turbine generator set through the oil mist collecting hole and the internal channel of the oil collecting ring.

[0024] The magneto-fluid temperature sensor is disposed in the magneto-fluid temperature hole. The magneto-fluid temperature sensor detects the temperature of the magneto-fluid in the first ring groove through the magneto-fluid temperature detection channel. The safety liquid level detection sensor is disposed on the safety liquid level detection hole. The safety liquid level detection sensor detects the liquid level height of the magneto-fluid in the first ring groove through the safety liquid level detection hole and the through hole of the oil collecting ring. The magneto-fluid viscosity sensor is disposed on the magneto-fluid viscosity hole. The magneto-fluid viscosity sensor detects the viscosity of the magneto-fluid in the first ring groove through the magneto-fluid viscosity detection hole and the through hole of the oil collecting ring. The magnetic liquid input device is disposed on the magneto-fluid input hole. The magnetic liquid is input into the first ring groove through the magnetic liquid input device and the magneto-fluid input hole. The magnetic liquid recovery device is disposed on the magneto-fluid recovery hole. The magnetic liquid recovery device recovers the magneto-fluid in the first ring groove through the magneto-fluid recovery hole and the through hole of the oil collecting ring. One end of the heat exchange tube in the magneto-fluid heat exchange system is communicated with the heat exchange access hole, and the coolant is input into the heat exchange tube through the heat exchange access hole. The other end of the heat exchange tube is communicated with the heat exchange outlet hole, and the coolant in the heat exchange tube is discharged through the heat exchange outlet hole.

[0025] Further, a support bearing is installed at the bottom end inside the bearing base. A protrusion is provided below the main shaft, and the main shaft is lapped on the support bearing through the protrusion. The shaft ring of the support bearing is installed on the outer peripheral surface of the main shaft. The lower end of the main shaft extends into the inside of the gearbox support frame and is connected to the spline shaft. Upper and lower shaft shoulders are provided on the main shaft. An installation groove is formed inside the bearing base, and the bottom of the installation groove corresponds to the lower shaft shoulder. A guiding bearing is provided between the main shaft and the bearing base. The inner ring of the guiding bearing is arranged on the lower shaft shoulder of the main shaft, and the outer ring of the guiding bearing is arranged in the installation groove. A guide bearing inner ring pressing ring is provided at the upper shaft shoulder of the main shaft, and the bearing inner ring pressing ring is connected to the inner ring of the guiding bearing. A bearing outer ring pressing ring is provided at the top end of the installation groove, and the bearing outer ring pressing ring is connected to the outer ring of the guiding bearing.

[0026] Further, the outer peripheral surface of the oil collecting ring assembly is in close contact with the inner peripheral surface of the bearing base, and the upper surface of the oil collecting ring assembly is close to the lower end surface of the static pole shoe assembly. An installation boss is provided on the outer peripheral surface of the static pole shoe assembly, and flange connection holes are formed in the installation boss. The static pole shoe assembly is connected to the bearing base through the flange connection holes and bolts. The base in the magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-generator unit is removed from the bottom of the static pole shoe assembly, and then the oil collecting ring assembly and the bearing base are installed on the lower end surface of the static pole shoe assembly, that is, the base in the magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-generator unit is replaced by the oil collecting ring assembly and the bearing base.

[0027] The beneficial effects of the present invention are as follows: The oil mist is sealed by the magnetic fluid in the first annular groove. The magnetic fluid sealing has advantages such as "zero leakage, low friction, long life and high reliability". Applying the magnetic fluid sealing technology to seal the oil guide groove cover plate of the hydro-generator unit can effectively solve the problems of oil mist overflow and main shaft wear, and improve the safety and reliability of the hydro-generator unit.

[0028] The comprehensive test bench can be used to simulate the effects of factors such as oil mist pressure, oil mist concentration, main shaft speed, dust concentration, ambient magnetic field strength, ambient temperature, and cooling heat exchange temperature under real working conditions on the pressure resistance of magnetic fluid sealing, magnetic fluid temperature, seal leakage amount, friction torque, and heat exchange temperature control strategy, providing a scientific design method and reliable data support for evaluating and verifying the sealing performance of magnetic fluid sealing on the upper guide bearing of the hydro-generator unit and its popularization and application. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic diagram of the magnetohydrodynamic seal structure of the upper guide oil trough cover of a hydro-generator set;

[0031] Figure 2 It is a top view of the static pole shoe assembly in the magnetohydrodynamic seal structure of the upper guide oil trough cover of a hydro-generator set;

[0032] Figure 3 It is a top view of the base in the magnetohydrodynamic seal structure of the upper guide oil trough cover of a hydro-generator set;

[0033] Figure 4 It is Figure 2 the A-A sectional view in;

[0034] Figure 5 It is Figure 2 the B-B sectional view in;

[0035] Figure 6 It is Figure 2 the C-C sectional view in;

[0036] Figure 7 It is a sectional view of the comprehensive test bench for the magnetohydrodynamic seal of the guide oil trough cover of a hydro-generator set;

[0037] Figure 8 It is a schematic diagram of the drive system structure of the comprehensive test bench for the magnetic fluid seal of the upper guide oil trough cover of a hydro-generator set.

[0038] Figure 9 It is a top view of the seal gland assembly and the magnetohydrodynamic seal structure in the comprehensive test bench for the magnetohydrodynamic seal of the guide oil trough cover of a hydro-generator set;

[0039] Figure 10 It is a top view of the oil collecting ring assembly in the comprehensive test bench for the magnetohydrodynamic seal of the upper guide oil trough cover of a hydro-generator set;

[0040] Figure 11 It is a top view of the bearing pedestal in the comprehensive test bench for the magnetohydrodynamic seal of the upper guide oil trough cover of a hydro-generator set;

[0041] Figure 12 It is Figure 10 the D-D sectional view in;

[0042] Figure 13 It is Figure 10 the E-E sectional view in;

[0043] Figure 14 It is Figure 10 the F-F sectional view in. Specific implementation manner

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "one side", "one end", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 cannot be understood as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] As Figures 1-6 shown, the magnetohydrodynamic sealing structure of the oil guiding groove cover plate of the water turbine generator set includes a main shaft 1, and an annular base 2 is sleeved on the side wall of the main shaft 1. The magnetohydrodynamic sealing structure further includes a rotating shaft pole shoe assembly 3 and a static pole shoe assembly 4.

[0047] In this embodiment, the rotating shaft pole shoe assembly 3 is sleeved outside the main shaft 1. The rotating shaft pole shoe assembly 3 includes four split-type and equally angled rotating shaft pole shoes 301. The four rotating shaft pole shoes 301 are connected end to end to form an annular rotating shaft pole shoe assembly 3. An arc-shaped rotating shaft sealing boss 302 is provided on the lower surface of each rotating shaft pole shoe 301, and a sealing tooth 303 is provided on the outside of each rotating shaft sealing boss 302.

[0048] Among them, four sets of static pole shoe assemblies 4 are sleeved outside the main shaft 1. The static pole shoe assemblies 4 are installed on the upper surface of the base 2. The upper surface of the annularly arranged static pole shoe assemblies 4 is provided with a first annular groove 401, a second annular groove 402 and a third annular groove 403 from outside to inside. The depths and sizes of the first annular groove 401, the second annular groove 402 and the third annular groove 403 are all different. A magnetorheological fluid is arranged in the first annular groove 401. The first annular groove 401 cooperates with the sealing teeth 303, and the sealing teeth 303 extend into the interior of the magnetorheological fluid. The third annular groove 403 cooperates with the rotating shaft sealing boss 302; a placement annular groove 404 for placing permanent magnets is provided on the lower surface of the static pole shoe assembly 4; the static pole shoe assembly 4 includes a first stationary pole shoe 405, a second stationary pole shoe 406, a third stationary pole shoe 407 and a safety drain pole shoe 408 connected end to end. The structures of the first stationary pole shoe 405, the second stationary pole shoe 406 and the third stationary pole shoe 407 are the same. First channel holes 409 are provided inside the first stationary pole shoe 405, the second stationary pole shoe 406 and the third stationary pole shoe 407. Second channel holes 410 are provided inside the first stationary pole shoe 405, the second stationary pole shoe 406, the third stationary pole shoe 407 and the safety drain pole shoe 408. The three first channel holes 409 and the four second channel holes 410 are all communicated with the first annular groove 401; a drain channel hole 411 is provided on the safety drain pole shoe 408, and one end of the drain channel hole 411 is communicated with the second annular groove 402; oil mist through holes 412 are provided through the middle parts of the outer diameters of the first stationary pole shoe 405, the second stationary pole shoe 406, the third stationary pole shoe 407 and the safety drain pole shoe 408. On both sides of the oil mist through holes 412 on the first stationary pole shoe 405, the second stationary pole shoe 406 and the third stationary pole shoe 407, magnetorheological fluid through holes 413 are symmetrically provided, and the magnetorheological fluid through holes 413 are respectively communicated with the first annular groove 401 through the corresponding first channel holes 409 or second channel holes 410; on both sides of the oil mist through hole 412 on the safety drain pole shoe 408, magnetorheological fluid through holes 413 and drain through holes 414 are symmetrically provided. The magnetorheological fluid through holes 413 on the safety drain pole shoe 408 are communicated with the first annular groove 401 through the second channel holes 410 provided thereon. The drain through holes 414 on the safety drain pole shoe 408 are communicated with the second annular groove 402 through the drain channel hole 411.

[0049] Specifically, the seven magnetorheological fluid through holes 413 include a magnetorheological fluid inlet 413-1, a magnetorheological fluid outlet 413-2, a coolant inlet 413-3, a coolant outlet 413-4 and three magnetorheological fluid detection ports 413-5. Among them, the magnetorheological fluid inlet 413-1 and the magnetorheological fluid outlet 413-2 are respectively arranged at the radial two ends of the static pole shoe assembly 4, and the coolant inlet 413-3 and the coolant outlet 413-4 are respectively arranged at the radial two ends of the static pole shoe assembly 4.

[0050] Based on the above embodiments, the first annular groove 401 communicates with the magnetorheological fluid through-hole 413 via the first channel hole 409 and the second channel hole 410, and the second annular groove 402 communicates with the drain through-hole 414 via the drain channel hole 411; the sealing teeth 303 extend into the magnetorheological fluid inside the first annular groove 401 to seal the oil mist inside the oil guide groove cover plate of the hydro-generator set. At the same time, a labyrinth seal is formed with the rotating shaft sealing boss 302 through the third annular groove 403, and the oil mist is buffered through the labyrinth seal and the second annular groove 402; when the oil mist enters the second annular groove 402 for buffering, some of the oil mist in the second annular groove 402 condenses into a liquid state. The liquid oil mist enters the second annular groove 402 through the third annular groove 403, and the oil mist is discharged from the static pole shoe assembly 4 through the drain channel hole 411 in the second annular groove 402 and the drain through-hole 414; when too much magnetorheological fluid is replenished in the first annular groove 401, the overflowing magnetorheological fluid overflows to the inside of the second annular groove through the step between the first annular groove 401 and the second annular groove 402, and the overflowing magnetorheological fluid is discharged from the static pole shoe assembly 4 through the drain channel hole 411 in the second annular groove 402 and the drain through-hole 414, ensuring the safety and reliability of the seal.

[0051] In this embodiment, the base 2 includes four split base ring segments 201 that are connected end to end at equal angles. An oil mist groove 202 is provided on the inner side of each base 2, and an oil mist internal channel 203 is provided inside each base ring segment 201. One end of each oil mist internal channel 203 communicates with the oil mist groove 202, and the other end of each oil mist internal channel 203 communicates with the corresponding oil mist through-hole 412.

[0052] Specifically, the four oil mist through-holes 412 include two oil mist detection holes 412-1 and two breather valve holes 412-2. The two breather valve holes 412-2 are respectively provided at the radial two ends of the static pole shoe assembly 4.

[0053] Based on the above embodiments, the two oil mist detection holes 412-1 and the two breather valve holes 412-2 respectively communicate with the oil mist groove 202 through the oil mist internal channels 203; the breather valve holes 412-2 ensure that the oil mist pressure inside the oil guide groove cover plate of the hydro-generator set is within a safe range.

[0054] In this embodiment, one end of each oil mist internal channel 203 penetrates through the outer wall of the base 2, and a plug is provided at the end of each oil mist internal channel; one end of each of the first channel hole, the second channel hole, and the drain channel hole penetrates through the outer wall of the static pole shoe assembly, and a plug is provided at the end of each of the first channel hole, the second channel hole, and the drain channel hole.

[0055] Based on the above embodiments, magnetic fluid is filled into the first annular groove 401 through the magnetic fluid inlet 413-1, and the sealing teeth 303 are inserted into the magnetic fluid in the first annular groove 401 to form a magnetic fluid seal, performing magnetic fluid seal on the oil guide groove cover plate of the hydro-generator set. At the same time, the oil mist is sealed by the labyrinth seal of the rotating shaft sealing boss 302 and the third annular groove 403, and the oil mist is buffered by the second annular groove 402, which can effectively solve the problems of oil mist overflow and wear of the main shaft, and improve the safety and reliability of the hydro-generator set.

[0056] As Figures 7-14 shown, the magnetic fluid seal comprehensive test bench for the oil guide groove cover plate of the hydro-generator set is used to detect the sealing performance of the rotating shaft pole shoe assembly 3 and the static pole shoe assembly 4 in the magnetic fluid seal structure of the oil guide groove cover plate of the hydro-generator set. The comprehensive test bench includes: a support assembly 5, a transmission system 6, a bearing base 7, an oil collecting ring assembly 8, a sealing gland assembly 9, a heat preservation box 901, a data acquisition system and a control system.

[0057] In this embodiment, as Figure 7 、 Figure 8 shown, the support assembly 5 includes a T-shaped table 501, and a gearbox support frame 502 is provided on one side above the T-shaped table 501, and a connection hole 503 is provided on one side of the gearbox support frame 502.

[0058] Among them, the transmission system 6 is arranged above the T-shaped table 501 and includes a variable frequency motor 601. The output end of the variable frequency motor 601 extends to the connection hole 503 and is connected with a gear reduction box 603 through an elastic coupling 602. The gear reduction box 603 is arranged inside the gearbox support frame 502. The output shaft of the gear reduction box 603 is connected with a torque sensor 605 through a gearbox rotating shaft expansion sleeve 604. The torque sensor 605 is connected with a diaphragm coupling 607 through a flange connection adapter 606. One end of the diaphragm coupling 607 is provided with a spline shaft expansion sleeve 608, and a spline shaft 609 is arranged inside the spline shaft expansion sleeve 608. One end of the spline shaft 609 is connected with the main shaft 1.

[0059] Based on the above embodiments, the torque sensor 605 is used to measure the torque and speed of the main shaft 1 on the comprehensive test bench, ensure that the rotation of the main shaft 1 is within a safe range, and provide control feedback to protect the main shaft 1 from the influence of abnormal working conditions; the main shaft 1 is installed on the spline shaft 609, and the main shaft 1 is driven to rotate by the variable frequency motor 601. While the main shaft 1 rotates, it drives the rotating shaft pole shoe assembly 3 to rotate, and the sealing teeth 303 on the lower surface of the rotating shaft pole shoe rotate in the first annular groove 401, and the oil guide groove cover plate of the hydro-generator set is sealed by the sealing teeth 303 and the magnetic fluid in the first annular groove 401.

[0060] In this embodiment, as Figures 10-14As shown in the figure, 7 bearing bases are sleeved outside the main shaft 1. The bearing bases 7 are installed above the gearbox support frame 502. The top of the bearing base 7 is provided with a base drain hole 703, seven first base through holes 701 and eight second base through holes 702. The first base through holes 701 and the second base through holes 702 are arranged at intervals. The base drain hole 703 is arranged between the first base through holes 701 and the second base through holes 702. The seven first base through holes 701, the eight second base through holes 702 and the base drain hole 703 are evenly arranged at equal angles on the bearing base 7.

[0061] Among them, the seven first base through holes 701 are respectively a magnetorheological fluid temperature hole 701-1, a magnetorheological fluid viscosity hole 701-2, a safety liquid level detection hole 701-3, a magnetorheological fluid recovery hole 701-4, a heat exchange access hole 701-5, a heat exchange outlet hole 701-6, and a magnetorheological fluid input hole 701-7. And the seven first base through holes 701 are circumferentially opened at the top end of the bearing base 7; the eight second base through holes 702 are respectively an oil mist generation hole 702-1, an oil mist temperature and humidity connection hole 702-2, an oil mist pressure detection hole 702-3, a first breather valve hole 702-4, an oil mist collection hole 702-5, an oil mist pressure safety hole 702-6, an oil mist concentration detection hole 702-7, and a second breather valve hole 702-8. And the eight second base through holes 702 are circumferentially opened at the top end of the bearing base 7.

[0062] Specifically, breather valves are provided on both the first breather valve hole 702-4 and the second breather valve hole 702-8. The first breather valve hole 702-4 and the second breather valve hole 702-8 are respectively arranged at the radial two ends of the bearing base 7. The magnetorheological fluid input hole 701-7 and the magnetorheological fluid recovery hole 701-4 are respectively arranged at the radial two ends of the bearing base 7. The heat exchange access hole 701-5 and the heat exchange outlet hole 701-6 are respectively arranged at the radial two ends of the bearing base 7.

[0063] A support bearing 704 is installed at the bottom end inside the bearing base 7. There is a protrusion 101 below the main shaft 1. The main shaft is lapped on the support bearing 704 through the protrusion 101. The race of the support bearing 704 is installed on the outer peripheral surface of the main shaft 1. The lower end of the main shaft 1 extends into the inside of the gearbox support frame 502 and is connected to the spline shaft 609; there are an upper shaft shoulder and a lower shaft shoulder on the main shaft 1. An installation groove is opened inside the bearing base 7, and the bottom of the installation groove corresponds to the lower shaft shoulder; a guide bearing 705 is arranged between the main shaft 1 and the bearing base 7. The inner ring of the guide bearing 705 is arranged on the lower shaft shoulder of the main shaft 1, and the outer ring of the guide bearing 705 is arranged in the installation groove; a bearing inner ring retaining ring is arranged at the upper shaft shoulder of the main shaft 1, and the bearing inner ring retaining ring is connected to the inner ring of the guide bearing; a bearing outer ring retaining ring is arranged at the top end of the installation groove, and the bearing outer ring retaining ring is connected to the outer ring of the guide bearing.

[0064] Based on the above embodiments, the bearing base 7 is supported by the transmission support frame 502; the axial load of the main shaft 1 is borne by the support bearing 704. In the axial direction, the race of the support bearing 704 is mounted on the inner peripheral surface of the bearing base 7, and the shaft ring of the support bearing 704 is mounted on the outer peripheral surface of the main shaft 1; in the vertical direction, the lower end surface of the race of the support bearing 704 is in close contact with the bearing base 7, and the upper end surface of the shaft ring of the support bearing 704 is pressed by the protrusion of the main shaft 1; the guiding bearing 705 is used to bear the radial load of the main shaft 1 and guide the main shaft 1. The inner ring of the guiding bearing 705 is press-fitted on the outer peripheral surface of the main shaft 1, and the outer ring of the guiding bearing 705 is in close contact with the inner peripheral surface of the bearing base 7; in the axial direction, the lower end of the inner ring of the guiding bearing 705 is in close contact with the lower shoulder of the main shaft 1, the lower end of the outer ring of the guiding bearing 705 is mounted in the installation groove of the bearing base 7, and the upper end of the outer ring of the guiding bearing 705 is pressed by the bearing outer ring pressing ring.

[0065] In this embodiment, an oil collecting ring assembly 8 is provided between the main shaft 1 and the bearing base 7. The oil collecting ring assembly 8 includes a first oil collecting flap 801, a second oil collecting flap 802, a third oil collecting flap 803 and a fourth oil collecting flap 804. The first oil collecting flap 801, the second oil collecting flap 802, the third oil collecting flap 803 and the fourth oil collecting flap 804 are connected end to end to jointly form an annular oil collecting ring assembly 8. Oil collecting grooves 805 are formed on the inner sides of the upper surfaces of the first oil collecting flap 801, the second oil collecting flap 802, the third oil collecting flap 803 and the fourth oil collecting flap 804. Two oil collecting ring internal channels 806 are formed inside each of the first oil collecting flap 801, the second oil collecting flap 802, the third oil collecting flap 803 and the fourth oil collecting flap 804. The eight oil collecting ring internal channels 806 are all communicated with the oil collecting grooves 805, and the other ends of the eight oil collecting ring internal channels 806 are respectively communicated with their corresponding second base through holes 702; two oil collecting ring through holes 807 are penetrated through the outer sides of the upper surfaces of the first oil collecting flap 801, the second oil collecting flap 802, the third oil collecting flap 803 and the fourth oil collecting flap 804. The oil collecting ring through holes 807 are arranged in a staggered manner with the oil collecting ring internal channels 806, and the oil collecting ring through holes 807 and the oil collecting ring internal channels 806 are evenly distributed on the annular oil collecting ring assembly 8. Seven of the eight oil collecting ring through holes 807 are respectively communicated with their corresponding first base through holes 701, and one of the eight oil collecting ring through holes 807 is communicated with the base drain hole 703.

[0066] Among them, the outer peripheral surface of the oil collecting ring assembly 8 is in close contact with the inner peripheral surface of the bearing base 7, the upper surface of the oil collecting ring assembly 8 is close to the lower end surface of the static pole shoe assembly 4. The outer peripheral surface of the static pole shoe assembly 4 is provided with an installation boss 415, and flange connection holes are formed on the installation boss 415. The static pole shoe assembly 4 is connected to the bearing base 7 through the flange connection holes and bolts.

[0067] Based on the above embodiments, the base 2 in the magnetic fluid seal structure of the oil guiding groove cover plate of the hydro-generator set is removed from the bottom of the static pole shoe assembly 4, and then the oil collecting ring assembly 8 and the bearing pedestal 7 are installed on the lower end surface of the static pole shoe assembly 4, that is, the base 2 in the magnetic fluid seal structure of the oil guiding groove cover plate of the hydro-generator set is replaced by the oil collecting ring assembly 8 and the bearing pedestal 7; the angle between each first pedestal through-hole 701 and the adjacent second pedestal through-hole 702 is 22.5 degrees; the angle between the pedestal drain hole 703 and the first pedestal holes 701 and the second pedestal holes 702 on both sides of it is 22.5 degrees.

[0068] In this embodiment, as Figure 9 shown, the seal gland assembly 9 is arranged on the top of the bearing pedestal 7. The seal gland assembly 9 includes four split and equiangular seal glands 902. Each seal gland 902 is provided with a gland through-hole 905. Among them, two spaced gland through-holes 905 are respectively the dust generating device hole 905-1 and the dust collecting device hole 905-2; the tops of the four-piece seal glands 905 are jointly connected with a seal top cover 903. A leakage collection hole 904 runs through the middle of the seal top cover 903; the magnetic fluid seal structure and the oil collecting ring assembly 8 are both arranged inside the seal gland assembly 9. The three first channel holes 409, the four second channel holes 410 and the drain channel hole 411 on the static pole shoe assembly 4 are respectively communicated with eight oil collecting ring through-holes 807; among them, the drain channel hole 411 is communicated with the pedestal drain hole 703 through the oil collecting ring through-hole 807.

[0069] Among them, the heat preservation box 901 is of a hollow structure, arranged outside the seal gland assembly 9, and one end of the heat preservation box 901 is connected with the bearing pedestal 7. The top cover of the heat preservation box 901 is provided with a plurality of mounting holes, which are respectively used for installing a hot air inlet pipe, a hot air outlet pipe, a temperature detection pipe, a dust inlet pipe, a dust outlet pipe, a dust particle size / concentration detection pipe, a magnetic field sensor pipe and a leakage collection pipe; a magnetic field generator 906 is arranged between the heat preservation box 901 and the seal gland assembly 9, and the bottom end of the magnetic field generator 906 is connected with the bearing pedestal 7.

[0070] Based on the above embodiments, the temperature of the sealed environment of the comprehensive test bench is ensured to be close to the temperature during the actual operation of the hydro-generator set through the heat preservation box 901; the influence of the magnetic field generated during the actual power generation process of the hydro-generator set on the sealing performance of the magnetic fluid seal structure of the oil guiding groove cover plate of the hydro-generator set is simulated through the magnetic field generator 906; the influence of the external environmental dust during the operation of the hydro-generator set on the magnetic fluid seal structure of the oil guiding groove cover plate of the hydro-generator set is simulated through a dust generator; the oil mist escaping from the guide bearing oil groove of the hydro-generator set is simulated through an oil mist generator.

[0071] In this embodiment, the data acquisition system includes a magnetic field data collection part, a dust environment data collection part, an oil mist data collection part, a magnetic fluid data collection part, a leakage amount collection part, and a torque sensor 605 provided on the transmission system 6; the magnetic field data collection part is composed of magnetic field intensity sensors, and the magnetic field sensors are installed in the cavity formed by the sealing gland 902 and the heat preservation box 901 through magnetic field sensor pipes; the dust data collection part is composed of a dust concentration / particle size distribution sensing device and a temperature sensor, and the dust concentration / particle size distribution sensing device and the temperature sensor are respectively installed on different gland through holes 905 by passing through the top cover of the heat preservation box 901 through a dust particle size / concentration detection pipe and a temperature detection pipe; the oil mist data collection part is composed of an oil mist pressure sensor, an oil mist temperature and humidity integrated sensor, and an oil mist concentration sensor, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively installed on three second base through holes 702 on the bearing base 7, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively connected to the internal channel 806 of the oil collecting ring of the oil collecting ring assembly 8 through the second base through hole 702; the magnetic fluid data collection part is composed of a magnetic fluid temperature sensor, a safety liquid level detection sensor, and a magnetic fluid viscosity sensor, and the magnetic fluid temperature sensor, the safety liquid level detection sensor, and the magnetic fluid viscosity sensor are respectively installed on three first base through holes 701, and the magnetic fluid temperature sensor, the safety liquid level detection sensor, and the magnetic fluid viscosity sensor are all connected to the first ring groove 401 through the first base through hole 701, the oil collecting ring through hole 807, and the first channel hole 409; the leakage amount collection part includes a leakage collection container, and the leakage collection container is internally communicated with the sealing top cover 903 through a leakage collection pipe on the heat preservation box 901 and a leakage collection hole 904; the input end of the torque sensor 605 is connected to the output shaft of the gear reduction box 603 through a gearbox rotating shaft expansion sleeve 604, and the output end of the torque sensor 605 is connected to the main shaft 1 through a flange connection adapter 606, a diaphragm coupling 607, a spline shaft expansion sleeve 608, and a spline shaft 609.

[0072] Among them, the control system includes a variable-frequency motor controller, an oil mist generator, an oil mist collection device, a dust generation device and a dust recovery device, a temperature control system, a magnetic fluid supply, replenishment and drainage automatic control system, and a magnetic fluid heat exchange system; the variable-frequency motor controller controls the variable-frequency motor 601 installed above the T-shaped table 501 to provide power for the rotation of the main shaft 1; the oil mist generator and the oil mist collection device are respectively installed on two second base through-holes 702, and both the oil mist generator and the oil mist collection device are connected to the oil sump 805 through the second base hole 702 and the internal channel 806 of the oil collection ring; the dust generation device and the dust recovery device respectively pass through the top cover of the heat preservation box 901 through the dust inlet pipe and the dust outlet pipe, and the dust generation and recovery devices are respectively installed on the dust generation device hole 905-1 and the dust collection device hole 905-2; the temperature control system includes an external temperature control device, and the external temperature control device is communicated with the internal cavity of the heat preservation box 901 through the hot air inlet pipe and the hot air outlet pipe installed on the heat preservation box 901, and the temperature control system is used to control the environmental temperature inside the sealed top cover; the magnetic fluid supply, replenishment and drainage automatic control system is composed of a magnetic fluid input device and a magnetic fluid recovery device, the magnetic fluid input device and the magnetic fluid recovery device are respectively installed on two first base through-holes 701, and both the magnetic fluid input device and the magnetic fluid recovery device are connected to the first ring groove 401 through the first base through-hole 701, the oil collection ring through-hole 807 and the second channel hole 410; the magnetic fluid heat exchange system includes a heat exchange tube arranged inside the first ring groove 401, one end of the heat exchange tube is communicated with the first channel hole 409 on the static pole shoe assembly 4, and one end of the heat exchange tube is connected to the heat exchange inlet through the first channel hole 409, the oil collection ring through-hole 807 and the first base through-hole 701; the other end of the heat exchange tube is communicated with the second channel hole 410 on the static pole shoe assembly 4, and the other end of the heat exchange tube is connected to the heat exchange outlet through the second channel hole 410, the oil collection ring through-hole 807 and the first base through-hole 701.

[0073] Based on the above embodiments, coolant is input into the heat exchange tube through the heat exchange access hole 701-5, and the coolant in the heat exchange tube flows to the other end of the diameter of the static pole shoe assembly 4, and the heat-exchanged coolant is discharged through the heat exchange outlet hole 701-6. At this time, the coolant is annularly arranged inside the first ring groove 401; the heat exchange access hole 701-5 and the heat exchange outlet hole 701-6 are distributed at both ends of the diameter of the static pole shoe assembly 4, and the heat exchange access hole 701-5 is arranged adjacent to the magnetic fluid input hole 701-7, and the heat exchange outlet hole 701-6 is arranged adjacent to the magnetic fluid recovery hole 701-4, which is convenient for the coolant in the heat exchange tube to exchange heat with the magnetic fluid in the first ring groove 401.

[0074] In this embodiment, the oil mist pressure sensor is disposed on the oil mist pressure detection hole 702-3. The oil mist pressure sensor detects the oil mist pressure inside the guide oil groove cover of the hydro-generator set through the oil mist pressure detection hole 702-3 and the internal channel 806 of the oil collecting ring. The integrated oil mist temperature and humidity sensor is disposed on the oil mist temperature and humidity connection hole 702-2. The integrated oil mist temperature and humidity sensor detects the temperature and humidity of the oil mist inside the guide oil groove cover of the hydro-generator set through the oil mist temperature and humidity detection hole 702-2. The oil mist concentration sensor is disposed on the oil mist concentration detection hole 702-7. The oil mist concentration sensor detects the concentration of the oil mist inside the guide oil groove cover of the hydro-generator set through the oil mist concentration detection hole 702-7. The oil mist generator is disposed on the oil mist generation hole 702-1. The oil mist generated by the oil mist generator is input into the inside of the guide oil groove cover of the hydro-generator set through the oil mist generation hole 702-1. The oil mist collection device is disposed on the oil mist collection hole 702-5. The oil mist collection hole 702-5 ensures that the oil mist can be discharged from the inside of the guide oil groove cover of the hydro-generator set. The oil mist discharged through the oil mist collection hole 702-5 and the oil mist entering through the oil mist generation hole 702-1 form a cycle, and an oil mist with a certain pressure, temperature and concentration is formed inside the oil groove cover of the hydro-generator set.

[0075] The magneto-fluid temperature sensor is disposed on the magneto-fluid temperature hole 701-1. The magneto-fluid temperature sensor detects the temperature of the magneto-fluid in the first ring groove 401 through the magneto-fluid temperature detection channel. The safety liquid level detection sensor is disposed on the safety liquid level detection hole 701-3. The safety liquid level detection sensor detects the liquid level height of the magneto-fluid in the first ring groove 407 through the safety liquid level detection hole 701-3. The magneto-fluid viscosity sensor is disposed on the magneto-fluid viscosity hole 701-2. The magneto-fluid viscosity sensor detects the viscosity of the magneto-fluid in the first ring groove 401 through the magneto-fluid viscosity detection hole 701-2. The magnetic liquid input device is disposed on the magneto-fluid input hole 701-7. The magnetic liquid is input into the first ring groove 401 through the magnetic liquid input device and the magneto-fluid input hole 701-7. The magnetic liquid recovery device is disposed on the magneto-fluid recovery hole 701-4. The magnetic liquid recovery device recovers the magneto-fluid in the first ring groove 401 through the magneto-fluid recovery hole 701-4. One end of the heat exchange tube in the magneto-fluid heat exchange system is communicated with the heat exchange access hole 701-5, and the coolant is input into the heat exchange tube through the heat exchange access hole 701-5. The other end of the heat exchange tube is communicated with the heat exchange outlet hole 701-6, and the coolant in the heat exchange tube is discharged through the heat exchange outlet hole 701-6.

[0076] Based on the above embodiments, the magnetic field intensity, dust concentration and particle size distribution, and temperature data inside the oil guiding trough cover of the water turbine generator unit are collected through the data acquisition system. The temperature, liquid level height, and viscosity information of the magnetic fluid are collected through the magnetic fluid data collection part. The pressure, temperature, humidity, and oil mist concentration of the oil mist are collected through the oil mist data collection part. The magnetic liquid and oil mist inside the oil guiding trough cover of the water turbine generator unit are supplemented or discharged through the control system, thereby changing the pressure of the magnetic liquid and oil mist inside the oil guiding trough cover of the water turbine generator unit.

[0077] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Hydrogenerator guide oil tank cover magnetohydrodynamic sealing comprehensive test bench, which is used to detect the sealing performance between the rotating shaft pole shoe assembly and the static pole shoe assembly in the magnetohydrodynamic sealing structure of the hydrogenerator guide oil tank cover, is characterized in that, The comprehensive test bench includes: A support assembly, including a T-shaped table, with a transmission support frame provided on one side above the T-shaped table, and a connection hole provided on one side of the transmission support frame; A transmission system, arranged above the T-shaped table, including a variable-frequency motor, the output end of the variable-frequency motor extending to the connection hole and connected with a gear reduction box through an elastic coupling. The gear reduction box is arranged inside the transmission support frame. The output shaft of the gear reduction box is connected with a torque sensor through a gearbox rotating shaft expansion sleeve. The torque sensor is connected with a diaphragm coupling through a flange connection adapter. One end of the diaphragm coupling is provided with a spline shaft expansion sleeve, and a spline shaft is arranged inside the spline shaft expansion sleeve. One end of the spline shaft is connected with the main shaft; A bearing base, sleeved outside the main shaft, the bearing base is installed above the transmission support frame. The top of the bearing base is provided with a base drain hole, seven first base through holes and eight second base through holes. The first base through holes and the second base through holes are arranged at intervals, and the base drain hole is arranged between the first base through holes and the second base through holes. The seven first base through holes, the eight second base through holes and the base drain hole are evenly arranged at equal angles on the bearing base; An oil collecting ring assembly, arranged between the main shaft and the bearing base. The oil collecting ring assembly includes a first oil collecting flap, a second oil collecting flap, a third oil collecting flap and a fourth oil collecting flap. The first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap are connected end to end to jointly form an annular oil collecting ring assembly. An oil collecting groove is provided on the inner side of the upper surface of each of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. Two oil collecting ring internal channels are provided inside each of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. The eight oil collecting ring internal channels are all communicated with the oil collecting groove, and the other ends of the eight oil collecting ring internal channels are respectively communicated with the corresponding second base through holes; Two oil collecting ring through holes are respectively provided on the outer side of the upper surface of each of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap. The oil collecting ring through holes and the oil collecting ring internal channels are arranged alternately, and the oil collecting ring through holes and the oil collecting ring internal channels are evenly distributed on the annular oil collecting ring assembly. Seven of the eight oil collecting ring through holes are respectively communicated with the corresponding first base through holes, and one of the eight oil collecting ring through holes is communicated with the base drain hole; A sealing gland assembly, arranged on the top of the bearing base. The sealing gland assembly includes four equally angled split sealing glands. Each sealing gland is provided with a gland through hole. Among them, two of the gland through holes at intervals are respectively a dust generating device hole and a dust collecting device hole; The tops of the four split sealing glands are jointly connected with a sealing top cover. A leakage collection hole is provided through the middle of the sealing top cover; The magnetic fluid sealing structure and the oil collecting ring assembly are both arranged inside the sealing gland assembly. The three first channel holes, the four second channel holes and the drain channel hole on the static pole shoe assembly are respectively communicated with the eight oil collecting ring through holes; Among them, the drain channel hole is communicated with the base drain hole through the oil collecting ring through hole; The incubator is of a hollow structure and is arranged outside the sealed gland assembly. One end of the incubator is connected to the bearing base. There are multiple mounting holes on the top cover of the incubator, and the multiple mounting holes are respectively used for mounting a hot air inlet pipe, a hot air outlet pipe, a temperature detection pipe, a dust inlet pipe, a dust outlet pipe, a dust particle size / concentration detection pipe, a magnetic field sensor pipe, and a leakage collection pipe; a magnetic field generator is arranged between the incubator and the sealed gland assembly, and the bottom end of the magnetic field generator is connected to the bearing base; The data acquisition system includes a magnetic field data collection part, a dust environment data collection part, an oil mist data collection part, a magnetofluid data collection part, a leakage amount collection part, and a torque sensor arranged on the transmission system; the magnetic field data collection part is composed of magnetic field intensity sensors, and the magnetic field sensors are installed in the cavity formed by the sealed gland and the incubator through the magnetic field sensor pipes; the dust data collection part is composed of a dust concentration / particle size distribution sensing device and a temperature sensor, and the dust concentration / particle size distribution sensing device and the temperature sensor are respectively installed on different gland through holes by passing through the incubator top cover through the dust particle size / concentration detection pipe and the temperature detection pipe; the oil mist data collection part is composed of an oil mist pressure sensor, an oil mist temperature and humidity integrated sensor, and an oil mist concentration sensor, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively installed on three second base through holes on the bearing base, and the oil mist pressure sensor, the oil mist temperature and humidity integrated sensor, and the oil mist concentration sensor are respectively connected to the internal channel of the oil collecting ring of the oil collecting ring assembly through the second base through holes; the magnetofluid data collection part is composed of a magnetofluid temperature sensor, a safety liquid level detection sensor, and a magnetofluid viscosity sensor, and the magnetofluid temperature sensor, the safety liquid level detection sensor, and the magnetofluid viscosity sensor are respectively installed on three first base through holes, and the magnetofluid temperature sensor, the safety liquid level detection sensor, and the magnetofluid viscosity sensor are all connected to the first annular groove for placing the magnetofluid opened on the static pole shoe assembly through the first base through holes, the oil collecting ring through holes, and the first channel holes; the leakage amount collection part includes a leakage collection container, and the leakage collection container is communicated with the inside of the sealed gland assembly through the leakage collection pipe on the incubator and the leakage collection hole on the sealed top cover; the input end of the torque sensor is connected to the output shaft of the gear reduction box through a gearbox rotating shaft expansion sleeve, and the output end of the torque sensor is connected to the main shaft through a flange connecting adapter, a diaphragm coupling, a spline shaft expansion sleeve, and a spline shaft; Control system, including a variable-frequency motor controller, an oil mist generator, an oil mist collection device, a dust generation device, a dust recovery device, a temperature control system, a magnetic fluid supply, replenishment and drainage automatic control system, and a magnetic fluid heat exchange system; the variable-frequency motor controller controls a variable-frequency motor installed above the T-shaped table to provide power for the rotation of the main shaft; the oil mist generator and the oil mist collection device are respectively installed on two second base through-holes, and both the oil mist generator and the oil mist collection device are connected to the oil sump through the second base holes and the internal channels of the oil collecting ring; the dust generation device and the dust recovery device respectively pass through the top cover of the heat preservation box through the dust inlet pipe and the dust outlet pipe, and are respectively installed on the dust generation device hole and the dust collection device hole; the temperature control system includes an external temperature control device, and the external temperature control device is communicated with the internal cavity of the heat preservation box through the hot air inlet pipe and the hot air outlet pipe installed on the heat preservation box; the magnetic fluid supply, replenishment and drainage automatic control system consists of a magnetic fluid input device and a magnetic fluid recovery device, the magnetic fluid input device and the magnetic fluid recovery device are respectively installed on two of the first base through-holes, and both the magnetic fluid input device and the magnetic fluid recovery device are connected to the first annular groove through the first base through-holes, the oil collecting ring through-holes and the second channel holes; the magnetic fluid heat exchange system includes a heat exchange pipe arranged inside the first annular groove, one end of the heat exchange pipe is communicated with the first channel hole on the static pole shoe assembly, and one end of the heat exchange pipe is connected to the heat exchange inlet through the first channel hole, the oil collecting ring through-hole and the first base through-hole; the other end of the heat exchange pipe is communicated with the second channel hole on the static pole shoe assembly, and the other end of the heat exchange pipe is connected to the heat exchange outlet through the second channel hole, the oil collecting ring through-hole and the first base through-hole.

2. The comprehensive test bench for the magnetic fluid seal of the oil guiding trough cover plate of the water turbine generator set according to claim 1, characterized in that, The seven first base through-holes are respectively a magnetic fluid temperature hole, a magnetic fluid viscosity hole, a safety liquid level detection hole, a magnetic fluid recovery hole, a heat exchange access hole, a heat exchange outlet hole, and a magnetic fluid input hole, and the seven first base through-holes are circumferentially arranged at the top end of the bearing base; the eight second base through-holes are respectively an oil mist generation hole, an oil mist temperature and humidity connection hole, an oil mist pressure detection hole, a first breathing valve hole, an oil mist collection hole, an oil mist pressure safety hole, an oil mist concentration detection hole, and a second breathing valve hole, and the eight second base through-holes are circumferentially arranged at the top end of the bearing base.

3. The comprehensive test bench for the magnetic fluid seal of the oil guiding trough cover plate of a hydro-generating unit according to claim 2, characterized in that Breathing valves are provided on both the first breathing valve hole and the second breathing valve hole, the first breathing valve hole and the second breathing valve hole are respectively arranged at the radial two ends of the bearing base, the magnetic fluid input hole and the magnetic fluid recovery hole are respectively arranged at the radial two ends of the bearing base, and the heat exchange access hole and the heat exchange outlet hole are respectively arranged at the radial two ends of the bearing base.

4. The comprehensive test bench for the magnetic fluid seal of the oil guide trough cover of a water turbine generator set according to claim 3, characterized in that, The oil mist pressure sensor is disposed on the oil mist pressure detection hole. The oil mist pressure sensor detects the oil mist pressure inside the guide oil groove cover plate of the water turbine generator set through the oil mist pressure detection hole and the internal channel of the oil collecting ring. The oil mist temperature and humidity integrated sensor is disposed on the oil mist temperature and humidity connection hole. The oil mist temperature and humidity integrated sensor detects the temperature and humidity of the oil mist inside the guide oil groove cover plate of the water turbine generator set through the oil mist temperature and humidity detection hole and the internal channel of the oil collecting ring. The oil mist concentration sensor is disposed on the oil mist concentration detection hole. The oil mist concentration sensor detects the concentration of the oil mist inside the guide oil groove cover plate of the water turbine generator set through the oil mist concentration detection hole and the internal channel of the oil collecting ring. The oil mist generator is disposed on the oil mist generation hole. The oil mist generated by the oil mist generator is input into the inside of the guide oil groove cover plate of the water turbine generator set through the oil mist generation hole and the internal channel of the oil collecting ring. The oil mist collection device is disposed on the oil mist collection hole. The oil mist collection device ensures that the oil mist can be discharged from the inside of the guide oil groove cover plate of the water turbine generator set through the oil mist collection hole and the internal channel of the oil collecting ring. The magneto - fluid temperature sensor is disposed in the magneto - fluid temperature hole. The magneto - fluid temperature sensor detects the temperature of the magneto - fluid in the first ring groove through the magneto - fluid temperature detection channel. The safety liquid level detection sensor is disposed on the safety liquid level detection hole. The safety liquid level detection sensor detects the liquid level height of the magneto - fluid in the first ring groove through the safety liquid level detection hole and the through - hole of the oil collecting ring. The magneto - fluid viscosity sensor is disposed on the magneto - fluid viscosity hole. The magneto - fluid viscosity sensor detects the viscosity of the magneto - fluid in the first ring groove through the magneto - fluid viscosity detection hole and the through - hole of the oil collecting ring. The magnetic liquid input device is disposed on the magneto - fluid input hole. The magnetic liquid is input into the first ring groove through the magnetic liquid input device and the magneto - fluid input hole. The magnetic liquid recovery device is disposed on the magneto - fluid recovery hole. The magnetic liquid recovery device recovers the magneto - fluid in the first ring groove through the magneto - fluid recovery hole and the through - hole of the oil collecting ring. One end of the heat - exchange tube in the magneto - fluid heat - exchange system is communicated with the heat - exchange access hole, and the coolant is input into the heat - exchange tube through the heat - exchange access hole. The other end of the heat - exchange tube is communicated with the heat - exchange outlet hole, and the coolant in the heat - exchange tube is discharged through the heat - exchange outlet hole.

5. The comprehensive test bench for the magnetic fluid seal of the oil guiding trough cover plate of a hydro-generating unit according to claim 4, characterized in that, A support bearing is installed at the bottom end inside the bearing pedestal. A protrusion is provided below the main shaft. The main shaft is lapped on the support bearing through the protrusion. The race of the support bearing is installed on the outer peripheral surface of the main shaft. The lower end of the main shaft extends into the inside of the gearbox support frame and is connected to the spline shaft. Upper and lower shaft shoulders are provided on the main shaft. An installation groove is formed inside the bearing pedestal, and the bottom of the installation groove corresponds to the lower shaft shoulder. A guiding bearing is provided between the main shaft and the bearing pedestal. The inner ring of the guiding bearing is disposed on the lower shaft shoulder of the main shaft, and the outer ring of the guiding bearing is disposed in the installation groove. A guiding bearing inner - ring pressing ring is provided at the upper shaft shoulder of the main shaft. The bearing inner - ring pressing ring is connected to the inner ring of the guiding bearing. An outer - ring pressing ring of the bearing is provided at the top end of the installation groove. The outer - ring pressing ring of the bearing is connected to the outer ring of the guiding bearing.

6. The comprehensive test bench for the magnetic fluid seal of the oil guiding trough cover plate of a water turbine generator set according to claim 5, characterized in that, The outer peripheral surface of the oil collecting ring assembly is in close contact with the inner peripheral surface of the bearing base, and the upper surface of the oil collecting ring assembly is close to the lower end surface of the static pole shoe assembly. An installation boss is provided on the outer peripheral surface of the static pole shoe assembly, and flange connection holes are formed in the installation boss. The static pole shoe assembly is connected to the bearing base through the flange connection holes and bolts.

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