Hydro-generator set oil guide groove cover plate magnetofluid sealing structure and comprehensive experiment table

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 experiment table. 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

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering seals, and in particular relates to a magnetic fluid seal structure of an oil guide groove cover plate of a hydro-turbine generator set and a comprehensive test bench. Background Art

[0002] As the main equipment for hydropower generation in my country, the guide bearing of the hydro-turbine generator set is the key component for the reliable operation of its shaft system. During the operation of the unit, the oil mist formed by the loss and escape of the guide bearing lubricating oil enters the key parts of the unit such as the stator core and stator wire rods, seriously affecting the safe and stable operation of the unit; however, at present, the sealing structure of the guide bearing oil tank cover of the hydro-turbine generator set is mainly divided into two types: non-contact sealing and contact sealing; among them, the non-contact sealing structure has poor sealing effect, and after the installation of an oil mist absorption device, the oil mist overflow problem is still serious; the contact seal adopts polytetrafluoroethylene seal, which is very easy to cause wear to the rotating shaft and even scratch the main shaft, and the main shaft needs to be repaired frequently and the seals need to be replaced, and the operation and maintenance cost is extremely high; at the same time, after the guide bearing oil tank cover of the hydro-turbine generator set is sealed, its sealing state under different working environments cannot be determined, and thus the sealing condition of the guide bearing oil tank cover of the hydro-turbine generator set cannot be determined. Summary of the invention

[0003] The purpose of the present invention is to provide a magnetic liquid seal and comprehensive test bench for an oil guide groove cover of a hydro-turbine generator set, which can seal the oil mist of the oil guide groove cover of the hydro-turbine generator set to ensure that the oil mist will not leak and will not cause wear to the main shaft, and can detect the sealing condition of the magnetic liquid on the oil mist under different environments.

[0004] The technical solution of the present invention is: a magnetic fluid sealing structure of an oil guide groove cover of a hydro-turbine generator set, comprising a main shaft, a side wall of the main shaft is sleeved with an annular base, and the magnetic fluid sealing structure also comprises: a rotating shaft pole shoe assembly and a static pole shoe assembly;

[0005] The shaft pole shoe assembly is sleeved on the outside of the main shaft, and the shaft pole shoe assembly includes four equiangular shaft pole shoes of split type, and the four shaft pole shoes are connected end to end to form a ring-shaped shaft pole shoe assembly, and the lower surface of each shaft pole shoe is provided with an arc-shaped shaft sealing boss, and the outer side of each shaft sealing boss is provided with sealing teeth;

[0006] The static pole shoe assembly is sleeved on the outside of the main shaft, and the static pole shoe assembly is installed on the upper surface of the base. The upper surface of the annular static pole shoe assembly is provided with a first ring groove, a second ring groove and a third ring groove from the outside to the inside, and the depths and sizes of the first ring groove, the second ring groove and the third ring groove are different. A magnetic fluid is arranged in the first ring groove, and the first ring groove cooperates with the sealing tooth, and the sealing tooth extends into the interior of the magnetic fluid, and the third ring groove cooperates with the sealing boss of the rotating shaft; a placement ring 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 static pole shoe, a second static pole shoe, a third static pole shoe and a safety drainage pole shoe connected end to end, the first static pole shoe, the second static pole shoe and the third static pole shoe have the same structure, the first static pole shoe, the second static pole shoe and the third static pole shoe are all provided with a first channel hole inside, and the first static pole shoe, the second static pole shoe, the third static pole shoe The pole shoe and the safety drain pole shoe are both provided with a second channel hole inside, and the three first channel holes and the four second channel holes are all connected to the first annular groove; the safety drain pole shoe is provided with a drainage channel hole, and one end of the drainage channel hole is connected to the second annular groove; the middle of the outer diameter of the first stationary pole shoe, the second stationary pole shoe, the third stationary pole shoe and the safety drain pole shoe are penetrated with an oil mist through hole, and the oil mist through holes on the first stationary pole shoe, the second stationary pole shoe and the third stationary pole shoe are symmetrically provided with magnetic fluid through holes on both sides, and the magnetic fluid through holes are respectively connected to the first annular groove through the corresponding first channel hole or the second channel hole; the oil mist through hole on the safety drain pole shoe is symmetrically provided with magnetic fluid through holes and drainage through holes on both sides, the magnetic fluid through hole on the safety drain pole shoe is connected to the first annular groove through the second channel hole provided thereon, and the drainage through hole on the safety drain pole shoe is connected to the second annular groove through the drainage channel hole;

[0007] The base comprises four base ring petals of equal angles connected end to end, an oil mist groove is provided on the inner side of each base ring petal, an internal oil mist channel is provided inside each base ring petal, one end of each internal oil mist channel is connected to the oil mist groove, and the other end of each internal oil mist channel is connected to the corresponding oil mist through hole.

[0008] Furthermore, the four oil mist through holes include two oil mist detection holes and two breathing valve holes, and the two breathing valve holes are respectively arranged at the radial ends of the static pole shoe assembly.

[0009] Furthermore, 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, wherein the magnetic fluid inlet and the magnetic fluid outlet are respectively arranged at the radial ends of the static pole shoe assembly, and the coolant inlet and the coolant outlet are respectively arranged at the radial ends of the static pole shoe assembly.

[0010] Furthermore, one end of each of the oil mist internal channels passes through the outer wall of the base, and a plug is provided at the end of each of the oil mist internal channels; one end of each of the first channel holes, each of the second channel holes and the drainage channel hole passes through the outer wall 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 drainage channel hole.

[0011] The comprehensive test bench for the magnetic fluid seal of the oil guide groove cover of the hydro-turbine generator set is used to detect the magnetic fluid seal structure of the oil guide groove cover of the hydro-turbine generator set. The comprehensive test bench includes:

[0012] The support assembly comprises a T-shaped platform, a gearbox support frame is provided on one side above the T-shaped platform, and a connecting hole is provided on one side of the gearbox support frame;

[0013] The transmission system is arranged above the T-type stage, and includes a variable frequency motor, the output end of the variable frequency motor extends to the connection hole, and is connected to 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 to a torque sensor through a gearbox shaft expansion sleeve, the torque sensor is connected to a diaphragm coupling through a flange connection adapter, one end of the diaphragm coupling is provided with a spline shaft expansion sleeve, the spline shaft expansion sleeve is provided inside a spline shaft, and one end of the spline shaft is connected to the main shaft;

[0014] A bearing base is sleeved on the outside of the main shaft, and the bearing base is installed above the gearbox support frame. The top of the bearing base is provided with a base drainage 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 drainage 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 drainage hole are evenly arranged on the bearing base at equal angles;

[0015] An oil collecting ring assembly is arranged between the main shaft and the bearing base, and 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, and 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 form a ring-shaped oil collecting ring assembly, and 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 are all provided with oil collecting grooves, and the interiors of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap are all provided with two oil collecting ring internal channels, and the eight oil collecting ring internal channels are all The oil collecting ring is connected to the oil collecting groove, and the other ends of the internal channels of the eight oil collecting rings are respectively connected to the corresponding second base through holes; the outer sides of the upper surfaces of the first oil collecting petal, the second oil collecting petal, the third oil collecting petal and the fourth oil collecting petal are penetrated with two oil collecting ring through holes, the oil collecting ring through holes and the internal channels of the oil collecting ring are staggered, and the oil collecting ring through holes and the internal channels of the oil collecting ring are evenly distributed on the annular oil collecting ring assembly, seven of the eight oil collecting ring through holes are respectively connected to the corresponding first base through holes, and one of the eight oil collecting ring through holes is connected to the base drainage hole;

[0016] The sealing gland assembly is arranged on the top of the bearing base. The sealing gland assembly includes four petal-type sealing glands with equal angles. Each sealing gland is provided with a gland through hole, wherein the two spaced gland through holes are respectively a dust generating device hole and a dust collecting device hole; the tops of the four petal sealing glands are commonly connected with a sealing top cover, and a leakage collection hole is penetrated in 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, and the three first channel holes, the four second channel holes and the drainage channel holes on the static pole shoe assembly are respectively connected with the eight oil collecting ring through holes; wherein the drainage channel hole is connected with the drainage hole of the base through the oil collecting ring through hole;

[0017] The heat preservation box is a hollow structure, which is arranged outside the sealing gland assembly, and one end of the heat preservation box is connected to the bearing base. A plurality of mounting holes are arranged on the top cover of the heat preservation box, and the plurality of mounting holes are respectively used to install 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 sealing gland assembly, and the bottom end of the magnetic field generator is connected to the bearing base;

[0018] 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 collection part and a torque sensor arranged on the transmission system; the magnetic field data collection part is composed of a magnetic field strength sensor, and the magnetic field sensor is installed in a cavity formed by a sealing gland and an insulation box through a magnetic field sensor pipeline; 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 through the dust particle size / concentration detection pipeline and the temperature detection pipeline through the insulation box top cover; 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 the three second base through holes on the bearing base, and the oil mist pressure sensor, the oil mist The integrated temperature and humidity sensor and the oil mist concentration sensor are connected to the internal channel of the oil collecting ring of the oil collecting ring assembly through the second base through hole respectively; 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, which are respectively installed on the three first base through holes, and the magnetic fluid temperature sensor, the safety liquid level detection sensor and the magnetic fluid viscosity sensor are connected to the first ring groove through the first base through hole, the oil collecting ring through hole and the first channel hole; the leakage collection part includes a leakage collection container, which is connected to the inside of the sealing gland assembly through the leakage collection pipe on the insulation 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 reducer through the gear box shaft expansion sleeve, and the output end of the torque sensor is connected to the main shaft through the flange connection adapter, the diaphragm coupling, the spline shaft expansion sleeve and the spline shaft;

[0019] The control system includes a variable frequency motor controller, an oil mist generator, an oil mist collecting device, a dust generating device, a dust recovery device, a temperature control system, a magnetic liquid supply, replenishment and drainage automatic control system, and a magnetic liquid heat exchange system; the variable frequency motor controller controls the variable frequency motor installed above the T-stage to provide power for the main shaft rotation; the oil mist generator and the oil mist collecting device are respectively installed on the two second base through holes, and the oil mist generator and the oil mist collecting device are both connected to the oil collecting tank through the second base hole and the internal channel of the oil collecting ring; the dust generating device and the dust recovery device pass through the top cover of the insulation box through the dust inlet pipe and the dust outlet pipe respectively, and are respectively installed on the dust generating device hole and the dust collecting device hole; the temperature control system includes an external temperature control device, which is connected to the dust generating device hole and the dust collecting device hole through the hot air inlet pipe installed on the insulation box and the hot air inlet pipe installed on the insulation box The air outlet pipe is connected to the internal cavity of the insulation box; the magnetic liquid supply, replenishment and drainage automatic control system consists of a magnetic liquid input device and a magnetic liquid recovery device, which are respectively installed on the two first base through holes, and the magnetic liquid input device and the magnetic liquid recovery device are both connected to the first ring groove through the first base through hole, the oil collecting ring through hole and the second channel hole; the magnetic liquid heat exchange system includes a heat exchange tube arranged inside the first ring groove, one end of the heat exchange tube is connected to the first channel hole on the static pole shoe assembly, and one end of the heat exchange tube 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 tube is connected to the second channel hole on the static pole shoe assembly, and the other end of the heat exchange tube is connected to the heat exchange outlet through the second channel hole, the oil collecting ring through hole and the first base through hole.

[0020] Furthermore, 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 opened at the top of the bearing base; the eight second base through holes are respectively an oil mist generating hole, an oil mist temperature and humidity connecting 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 opened at the top of the bearing base.

[0021] Furthermore, the first breathing valve hole and the second breathing valve hole are both provided with breathing valves, the first breathing valve hole and the second breathing valve hole are respectively arranged at the radial ends of the bearing base, the magnetic fluid input hole and the magnetic fluid recovery hole are respectively arranged at the radial ends of the bearing base, and the heat exchange access hole and the heat exchange outlet hole are respectively arranged at the radial ends of the bearing base.

[0022] Further, the oil mist pressure sensor is arranged on the oil mist pressure detection hole, and the oil mist pressure sensor detects the oil mist pressure in the oil guide groove cover plate of the hydro-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 arranged on the oil mist temperature and humidity connection hole, and the oil mist temperature and humidity integrated sensor detects the temperature and humidity of the oil mist in the oil guide groove cover plate of the hydro-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 arranged on the oil mist concentration detection hole, and the oil mist concentration sensor detects the concentration of the oil mist in the oil guide groove cover plate of the hydro-turbine generator set through the oil mist concentration detection hole and the internal channel of the oil collecting ring; the oil mist generator is arranged on the oil mist generating hole, and the oil mist generated by the oil mist generator inputs the oil mist into the interior of the oil guide groove cover plate of the hydro-turbine generator set through the oil mist generating hole and the internal channel of the oil collecting ring; the oil mist collecting device is arranged on the oil mist collecting hole, and ensures that the oil mist can be discharged from the interior of the oil guide groove cover plate of the hydro-turbine generator set through the oil mist collecting hole and the internal channel of the oil collecting ring;

[0023] The magnetic fluid temperature sensor is arranged on the magnetic fluid temperature hole, and the magnetic fluid temperature sensor detects the temperature of the magnetic fluid in the first ring groove through the magnetic fluid temperature detection channel; the safety liquid level detection sensor is arranged on the safety liquid level detection hole, and the safety liquid level detection sensor detects the liquid level height of the magnetic fluid in the first ring groove through the safety liquid level detection hole and the oil collecting ring through hole; the magnetic fluid viscosity sensor is arranged on the magnetic fluid viscosity hole, and the magnetic fluid viscosity sensor detects the viscosity of the magnetic fluid in the first ring groove through the magnetic fluid viscosity detection hole and the oil collecting ring through hole; The magnetic fluid input device is arranged on the magnetic fluid input hole, and the magnetic fluid is input into the first annular groove through the magnetic liquid input device and the magnetic fluid input hole; the magnetic liquid recovery device is arranged on the magnetic fluid recovery hole, and the magnetic liquid recovery device recovers the magnetic fluid in the first annular groove through the magnetic fluid recovery hole and the oil collecting ring through hole; one end of the heat exchange tube in the magnetic fluid heat exchange system is connected with the heat exchange access hole, and the coolant is input into the heat exchange tube through the heat exchange access hole, and the other end of the heat exchange tube is connected with the heat exchange outlet hole, and the coolant in the heat exchange tube is discharged through the heat exchange outlet hole.

[0024] Furthermore, a support bearing is installed at the bottom end of the bearing base, a protrusion is provided below the main shaft, and the main shaft is overlapped on the support bearing through the protrusion, and the shaft ring of the support bearing is installed on the outer circumferential surface of the main shaft, and the lower end of the main shaft extends to the interior of the gearbox support frame and is connected to the spline shaft; an upper shaft shoulder and a lower shaft shoulder are provided on the main shaft, and a mounting groove is opened inside the bearing base, and the bottom of the mounting groove corresponds to the lower shaft shoulder; a guide bearing is provided between the main shaft and the bearing base, and the inner ring of the guide bearing is provided on the lower shaft shoulder of the main shaft, and the outer ring of the guide bearing is provided in the mounting groove; a guide bearing inner ring pressure ring is provided at the upper shaft shoulder of the main shaft, and the bearing inner ring pressure ring is connected to the inner ring of the guide bearing; a bearing outer ring pressure ring is provided at the top of the mounting groove, and the bearing outer ring pressure ring is connected to the outer ring of the guide bearing.

[0025] Furthermore, the outer circumferential surface of the oil collecting ring assembly is tightly attached to the inner circumferential 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. The outer circumferential surface of the static pole shoe assembly is provided with a mounting boss, and the mounting boss is provided with a flange connecting hole, and the static pole shoe assembly is connected to the bearing base through the flange connecting hole and bolts.

[0026] The beneficial effects of the present invention are as follows: the oil mist is sealed by the magnetic fluid in the first ring groove, and the magnetic fluid seal has the advantages of "zero leakage, low friction, long life and high reliability". The magnetic fluid sealing technology is applied to the sealing of the oil guide groove cover plate of the hydro-turbine generator set, which can effectively solve the problems of oil mist overflow and main shaft wear, and improve the safety and reliability of the hydro-turbine generator set;

[0027] The comprehensive test bench can be used to simulate the influence of factors such as oil mist pressure, oil mist concentration, spindle speed, dust concentration, environmental magnetic field strength, ambient temperature, cooling and heat exchange temperature on the pressure resistance, magnetic fluid temperature, seal leakage, friction torque and heat exchange temperature control strategy of magnetic fluid seals under real working conditions, so as to provide scientific design methods and reliable data support for evaluating and verifying the sealing performance of magnetic fluid seals in guide bearings of hydro-turbine generator sets and their promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a schematic diagram of the magnetic fluid seal structure of the oil guide groove cover plate on the hydro-generator set;

[0030] Figure 2It is a top view of the static pole shoe assembly in the magnetic fluid seal structure of the oil guide groove cover plate of the hydro-generator set;

[0031] Figure 3 It is a top view of the base in the magnetic fluid seal structure of the oil guide groove cover plate of the hydro-generator set;

[0032] Figure 4 yes Figure 2 Middle AA section;

[0033] Figure 5 yes Figure 2 Middle BB section;

[0034] Figure 6 yes Figure 2 Middle CC section;

[0035] Figure 7 This is a cross-sectional view of the comprehensive test bench for magnetic fluid seal of the oil guide groove cover of the hydro-generator set;

[0036] Figure 8 It is a schematic diagram of the transmission system structure of the magnetic liquid seal comprehensive test bench for the upper oil guide groove cover of the hydro-turbine generator set.

[0037] Fig. 9 It is a top view of the sealing gland assembly and the magnetic fluid sealing structure in the comprehensive test bench for magnetic fluid sealing of the oil guide groove cover of the hydro-turbine generator set;

[0038] Fig.10 It is a top view of the oil collecting ring assembly in the magnetic fluid seal comprehensive test bench of the upper oil guide groove cover of the hydro-generator set;

[0039] Fig.11 This is a top view of the bearing base in the comprehensive test bench for magnetic fluid seals on the oil guide groove cover of the hydro-generator set;

[0040] Fig.12 yes Fig.10 Middle DD section;

[0041] Fig.13 yes Fig.10 Middle EE section;

[0042] Fig.14 yes Fig.10 Middle FF cross-section. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "one end", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installation", "setting", and "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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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 circumstances.

[0045] like Figure 1-6 As shown, the magnetic fluid sealing structure of the oil guide groove cover of the hydro-turbine generator set includes a main shaft 1, the side wall of the main shaft 1 is sleeved with an annular base 2, and the magnetic fluid sealing structure also includes: a rotating shaft pole shoe assembly 3 and a static pole shoe assembly 4.

[0046] In this embodiment, the shaft pole shoe assembly 3 is sleeved on the outside of the main shaft 1, and the shaft pole shoe assembly 3 includes four equiangular shaft pole shoes 301 of split petal type. The four shaft pole shoes 301 are connected end to end to form a ring-shaped shaft pole shoe assembly 3, and the lower surface of each shaft pole shoe 301 is provided with an arc-shaped shaft sealing boss 302, and the outer side of each shaft sealing boss 302 is provided with a sealing tooth 303.

[0047] Among them, the static pole shoe assembly 4 is sleeved on the outside of the main shaft 1, and the static pole shoe assembly 4 is installed on the upper surface of the base 2. The upper surface of the annular static pole shoe assembly 4 is provided with a first annular groove 401, a second annular groove 402 and a third annular groove 403 from the outside to the inside, and the depths and sizes of the first annular groove 401, the second annular groove 402 and the third annular groove 403 are different. A magnetic fluid is arranged in the first annular groove 401, the first annular groove 401 cooperates with the sealing tooth 303, the sealing tooth 303 extends into the interior of the magnetic fluid, and the third annular groove 403 cooperates with the rotating shaft sealing boss 302; the static pole shoe assembly 4 is provided with a placement annular groove 404 for placing a permanent magnet; the static pole shoe assembly 4 includes a first static pole shoe 405, a second static pole shoe 406, a third static pole shoe 407 and a safety drain pole shoe 408 connected end to end, the first static pole shoe 405, the second static pole shoe 406 and the third static pole shoe 407 have the same structure, the first static pole shoe 405, the second static pole shoe 406 and the third static pole shoe 407 are provided with a first channel hole 409 inside, the first static pole shoe 405, the second static pole shoe 406, the third static pole shoe 407 and the safety drain The pole shoe 408 is provided with a second channel hole 410 inside, and the three first channel holes 409 and the four second channel holes 410 are all connected to the first annular groove 401; the safety drain pole shoe 408 is provided with a drainage channel hole 411, and one end of the drainage channel hole 411 is connected to the second annular groove 402; 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 are all penetrated by an oil mist through hole 412 in the middle of the outer diameter, and the oil mist through holes on the first stationary pole shoe 405, the second stationary pole shoe 406 and the third stationary pole shoe 407 Magnetic fluid through holes 413 are symmetrically provided on both sides of 412, and the magnetic fluid through holes 413 are connected to the first annular groove 401 through the corresponding first channel hole 409 or the second channel hole 410 respectively; magnetic fluid through holes 413 and drainage through holes 414 are symmetrically provided on both sides of the oil mist through hole 412 on the safety drainage pole shoe 408, the magnetic fluid through hole 413 on the safety drainage pole shoe 408 is connected to the first annular groove 401 through the second channel hole 410 opened thereon, and the drainage through hole 414 on the safety drainage pole shoe 408 is connected to the second annular groove 402 through the drainage channel hole 411.

[0048] Specifically, the seven magnetic fluid through holes 413 include a magnetic fluid inlet 413-1, a magnetic fluid outlet 413-2, a coolant inlet 413-3, a coolant outlet 413-4 and three magnetic fluid detection ports 413-5, wherein the magnetic fluid inlet 413-1 and the magnetic fluid outlet 413-2 are respectively arranged at the radial 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 ends of the static pole shoe assembly 4.

[0049] Based on the above embodiment, the first annular groove 401 is connected to the magnetic fluid through hole 413 through the first channel hole 409 and the second channel hole 410, and the second annular groove 402 is connected to the drainage through hole 414 through the drainage channel hole 411; the sealing tooth 303 extends into the magnetic fluid in the first annular groove 401 to seal the oil mist in the oil guide groove cover plate of the hydro-generator set, and at the same time forms a labyrinth seal with the rotating shaft sealing boss 302 through the third annular groove 403, and buffers the oil mist through the labyrinth seal and the second annular groove 402; when the oil mist enters the second annular groove 402 for buffering, the second annular groove 402 After part of the oil mist inside is condensed into liquid, the liquid oil mist enters the second annular groove 402 through the third annular groove 403, and is discharged from the static pole shoe assembly 4 through the drainage channel hole 411 and the drainage through hole 414 in the second annular groove 402; when the magnetic fluid in the first annular groove 401 is supplemented too much, the overflowing magnetic fluid overflows to the interior of the second annular groove through the step between the first annular groove 401 and the second annular groove 402, and is discharged from the static pole shoe assembly 4 through the drainage channel hole 411 and the drainage through hole 414 in the second annular groove 402, thereby ensuring the safety and reliability of the seal.

[0050] In this embodiment, the base 2 includes four base ring petals 201 of equal angles connected end to end, an oil mist groove 202 is provided on the inner side of each base 2, an oil mist internal channel 203 is provided inside each base ring petal 201, one end of each oil mist internal channel 203 is connected to the oil mist groove, and the other end of each oil mist internal channel 203 is connected to the corresponding oil mist through hole 412.

[0051] Specifically, the four oil mist through holes 412 include two oil mist detection holes 412 - 1 and two breathing valve holes 412 - 2 , and the two breathing valve holes 412 - 2 are respectively arranged at two radial ends of the static pole shoe assembly 4 .

[0052] Based on the above embodiment, the two oil mist detection holes 412-1 and the two breathing valve holes 412-2 are connected to the oil mist groove 202 through the oil mist internal channel 203 respectively; the breathing valve hole 412-2 ensures that the oil mist pressure in the oil guide groove cover of the turbine generator set is within a safe range.

[0053] In this embodiment, one end of each oil mist internal channel 203 passes 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 holes, each of the second channel holes and the drainage channel hole passes through the outer wall 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 drainage channel hole.

[0054] Based on the above embodiment, magnetic fluid is filled into the first annular groove 401 through the magnetic fluid inlet 413-1, and the sealing tooth 303 is extended into the magnetic fluid in the first annular groove 401 to form a magnetic fluid seal, and the oil guide groove cover of the hydro-turbine generator set is sealed with magnetic fluid. At the same time, the oil mist is labyrinth-sealed through the shaft sealing boss 302 and the third annular groove 403, and the oil mist is buffered through the second annular groove 402, which can effectively solve the problems of oil mist overflow and main shaft wear, and improve the safety and reliability of the hydro-turbine generator set.

[0055] like Figure 7-14 As shown, the comprehensive test bench for the magnetic fluid seal of the oil guide groove cover of the hydro-turbine generator set is used to detect the magnetic fluid seal structure of the oil guide groove cover of the above-mentioned hydro-turbine generator set. The comprehensive test bench includes: a support component 5, a transmission system 6, a bearing base 7, an oil collecting ring component 8, a sealing gland component 9, an insulation box 901, and a data acquisition system and a control system.

[0056] In this embodiment, if Figure 7 , Figure 8 As shown, the support assembly 5 includes a T-shaped platform 501 , a gearbox support frame 502 is provided on one side above the T-shaped platform 501 , and a connecting hole 503 is provided on one side of the gearbox support frame 502 .

[0057] Among them, the transmission system 6 is arranged above the T-type stage 501, including a variable frequency motor 601, the output end of the variable frequency motor 601 extends to the connecting hole 503, and is connected to a gear reducer 603 through an elastic coupling 602, the gear reducer 603 is arranged inside the gearbox support frame 502, the output shaft of the gear reducer 603 is connected to a torque sensor 605 through a gearbox shaft expansion sleeve 604, the torque sensor 605 is connected to 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, the inside of the spline shaft expansion sleeve 608 is provided with a spline shaft 609, and one end of the spline shaft 609 is connected to the main shaft 1.

[0058] Based on the above embodiment, the torque sensor 605 is used to measure the torque and speed of the main shaft 1 on the comprehensive test bench to 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 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. When the main shaft 1 rotates, the shaft pole shoe assembly 3 is also driven to rotate. The sealing teeth 303 on the lower surface of the shaft pole shoe rotate in the first annular groove 401, and the oil guide groove cover plate of the hydro-turbine generator set is sealed by the sealing teeth 303 and the magnetic fluid in the first annular groove 401.

[0059] In this embodiment, if Figure 10-14As shown, the bearing base 7 is sleeved on the outside of the main shaft 1, and the bearing base 7 is installed above the gearbox support frame 502. The top of the bearing base 7 is provided with a base drainage 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, and the base drainage hole 703 is arranged between the first base through hole 701 and the second base through hole 702. The seven first base through holes 701, the eight second base through holes 702 and the base drainage hole 703 are evenly arranged at equal angles on the bearing base 7.

[0060] Among them, the seven first base through holes 701 are respectively a magnetic fluid temperature hole 701-1, a magnetic fluid viscosity hole 701-2, a safety liquid level detection hole 701-3, a magnetic fluid recovery hole 701-4, a heat exchange access hole 701-5, a heat exchange outlet hole 701-6, and a magnetic fluid input hole 701-7, and the seven first base through holes 701 are circumferentially opened at the top of the bearing base 7; the eight second base through holes 702 are respectively an oil mist generating hole 702-1, an oil mist temperature and humidity connecting hole 702-2, an oil mist pressure detection hole 702-3, a first breathing valve hole 702-4, an oil mist collecting hole 702-5, an oil mist pressure safety hole 702-6, an oil mist concentration detection hole 702-7, and a second breathing valve hole 702-8, and the eight second base through holes 702 are circumferentially opened at the top of the bearing base 7.

[0061] Specifically, breathing valves are provided on the first breathing valve hole 702-4 and the second breathing valve hole 702-8. The first breathing valve hole 702-4 and the second breathing valve hole 702-8 are respectively arranged at the radial ends of the bearing base 7, the magnetic fluid input hole 701-7 and the magnetic fluid recovery hole 701-4 are respectively arranged at the radial ends of the bearing base 7, and the heat exchange access hole 701-5 and the heat exchange outlet hole 701-6 are respectively arranged at the radial ends of the bearing base 7.

[0062] A support bearing 704 is installed at the bottom end of the bearing base 7, a protrusion 101 is provided below the main shaft 1, and the main shaft is overlapped on the support bearing 704 through the protrusion 101, and the shaft ring of the support bearing 704 is installed on the outer circumferential surface of the main shaft 1, and the lower end of the main shaft 1 extends to the inside of the gearbox support frame 502 and is connected to the spline shaft 609; an upper shaft shoulder and a lower shaft shoulder are provided on the main shaft 1, and a mounting groove is opened inside the bearing base 7, and the bottom of the mounting groove corresponds to the lower shaft shoulder; a guide bearing 705 is provided between the main shaft 1 and the bearing base 7, and 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 mounting groove; a bearing inner ring pressure ring is provided at the upper shaft shoulder of the main shaft 1, and the bearing inner ring pressure ring is connected to the inner ring of the guide bearing; a bearing outer ring pressure ring is provided at the top of the mounting groove, and the bearing outer ring pressure ring is connected to the outer ring of the guide bearing.

[0063] Based on the above embodiment, the bearing base 7 is supported by the gearbox support frame 502; the axial load of the main shaft 1 is borne by the support bearing 704, and in the axial direction, the seat ring of the support bearing 704 is installed on the inner circumference of the bearing base 7, and the shaft ring of the support bearing 704 is installed on the outer circumference of the main shaft 1; in the vertical direction, the lower end surface of the seat ring 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 guide 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 guide bearing 705 is installed on the outer circumference of the main shaft 1 with an interference fit, and the outer ring of the guide bearing 705 is in close contact with the inner circumference of the bearing base 7; in the axial direction, the lower end of the inner ring of the guide bearing 705 is in close contact with the lower shoulder of the main shaft 1, the lower end of the outer ring of the guide bearing 705 is installed in the mounting groove of the bearing base 7, and the upper end of the outer ring of the guide bearing 705 is pressed by the bearing outer ring pressure ring.

[0064] In this embodiment, the oil collecting ring assembly 8 is arranged between the main shaft 1 and the bearing base 7, and 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 form a ring-shaped oil collecting ring assembly 8. 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 are all provided with oil collecting grooves 805. The interiors 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 are all provided with two oil collecting ring internal channels 806, eight oil collecting ring internal channels 806 are all connected to the oil collecting groove 805, and the other ends of the eight oil collecting ring internal channels 806 are respectively connected to the corresponding second base through holes 702; 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 are penetrated by two oil collecting ring through holes 807, the oil collecting ring through holes 807 and the oil collecting ring internal channels 806 are staggered, 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 connected to the corresponding first base through holes 701, and one of the eight oil collecting ring through holes 807 is connected to the base drainage hole 703.

[0065] Among them, the outer circumference of the oil collecting ring assembly 8 is tightly attached to the inner circumference 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, and the outer circumference of the static pole shoe assembly 4 is provided with a mounting boss 415, and the mounting boss 415 is provided with a flange connecting hole, and the static pole shoe assembly 4 is connected to the bearing base 7 through the flange connecting hole and bolts.

[0066] Based on the above embodiment, the angle between each first base through hole 701 and its adjacent second base through hole 702 is 22.5 degrees; the angle between the base drainage hole 703 and the first base hole 701 and the second base hole 702 on both sides thereof is 22.5 degrees.

[0067] In this embodiment, if Fig. 9 As shown, the sealing gland assembly 9 is arranged on the top of the bearing base 7, and the sealing gland assembly 9 includes four petal-type sealing glands 902 with equal angles, and each sealing gland 902 is provided with a gland through hole 905, wherein the two spaced gland through holes 905 are respectively a dust generating device hole 905-1 and a dust collecting device hole 905-2; the tops of the four-petal sealing glands 905 are commonly connected with a sealing top cover 903, and a leakage collection hole 904 is penetrated through the middle of the sealing top cover 903; the magnetic fluid sealing structure and the oil collecting ring assembly 8 are both arranged inside the sealing gland assembly 9, and the three first channel holes 409, the four second channel holes 410 and the drainage channel hole 411 on the static pole shoe assembly 4 are respectively connected with the eight oil collecting ring through holes 807; wherein the drainage channel hole 411 is connected with the base drainage hole 703 through the oil collecting ring through hole 807.

[0068] Among them, the insulation box 901 is a hollow structure, which is arranged on the outside of the sealing cover assembly 9, and one end of the insulation box 901 is connected to the bearing base 7. A plurality of mounting holes are provided on the top cover of the insulation box 901, and the plurality of mounting holes are respectively used to install 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 provided between the insulation box 901 and the sealing cover assembly 9, and the bottom end of the magnetic field generator 906 is connected to the bearing base 7.

[0069] Based on the above embodiment, the insulation box 901 is used to ensure that the sealing environment temperature of the comprehensive test bench is close to the temperature of the actual working state of the hydro-turbine generator set; the magnetic field generator 906 is used to simulate the influence of the magnetic field generated during the actual power generation process of the hydro-turbine generator set on the sealing performance of the magnetic fluid sealing structure of the oil guide groove cover of the hydro-turbine generator set; the dust generator is used to simulate the influence of external environmental dust on the magnetic liquid sealing structure of the oil guide groove cover of the hydro-turbine generator set during the operation of the hydro-turbine generator set; the oil mist generator is used to simulate the oil mist escaping from the oil groove of the guide bearing of the hydro-turbine generator set.

[0070] 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 collection part and a torque sensor 605 arranged on the transmission system 6; the magnetic field data collection part is composed of a magnetic field strength sensor, and the magnetic field sensor is installed in the cavity formed by the sealing gland 902 and the insulation box 901 through a magnetic field sensor pipeline; 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 through dust particle size / concentration detection pipelines and temperature detection pipelines through the top cover of the insulation box 901; 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 the 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 The device is 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 the 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 connected to the oil collecting ring through the first base through hole 701, the oil collecting ring through hole 807 and the first channel hole 409. The first annular groove 401 is connected; the leakage collection part includes a leakage collection container, which is connected to the interior of the sealing cover assembly 9 through the leakage collection pipe on the insulation box 901 and the leakage collection hole 904 on the sealing top cover 903; the input end of the torque sensor 605 is connected to the output shaft of the gear reducer 603 through the gear box shaft expansion sleeve 604, and the output end of the torque sensor 605 is connected to the main shaft 1 through the flange connection adapter 606, the diaphragm coupling 607, the spline shaft expansion sleeve 608 and the spline shaft 609.

[0071] The control system includes a variable frequency motor controller, an oil mist generator, an oil mist collecting device, a dust generating device and a dust recovery device, a temperature control system, a magnetic liquid supply, replenishment and drainage automatic control system, and a magnetic liquid heat exchange system; the variable frequency motor controller controls the variable frequency motor 601 installed above the T-type stage 501 to provide power for the rotation of the main shaft 1; the oil mist generator and the oil mist collecting device are respectively installed on the two second base through holes 702, and the oil mist generator and the oil mist collecting device are connected to the oil collecting tank 805 through the second base hole 702 and the internal channel 806 of the oil collecting ring; the dust generating device and the dust recovery device pass through the top cover of the insulation box 901 through the dust inlet pipe and the dust outlet pipe respectively, and the dust generating and recovery devices are respectively installed on the dust generating device hole 905-1 and the dust collecting device hole 905-2; the temperature control system includes an external temperature control device, and the external temperature control device is connected to the insulation box 901 through the hot air inlet pipe and the hot air outlet pipe installed on the insulation box 901 1 is connected to the internal cavity, and the temperature control system is used to control the ambient temperature inside the sealed top cover; the magnetic liquid supply, replenishment and drainage automatic control system consists of a magnetic liquid input device and a magnetic liquid recovery device, which are respectively installed on the two first base through holes 701, and the magnetic liquid input device and the magnetic liquid recovery device are both connected to the first ring groove 401 through the first base through hole 701, the oil collecting ring through hole 807 and the second channel hole 410; the magnetic liquid heat exchange system includes a heat exchange tube arranged inside the first ring groove 401, one end of the heat exchange tube is connected to 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 collecting ring through hole 807 and the first base through hole 701; the other end of the heat exchange tube is connected to 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 collecting ring through hole 807 and the first base through hole 701.

[0072] Based on the above embodiment, coolant is input into the heat exchange tube through the heat exchange access hole 701-5, the coolant in the heat exchange tube flows to the other end of the diameter of the static pole shoe assembly 4, and the coolant after heat exchange is discharged through the heat exchange outlet hole 701-6. At this time, the coolant ring is arranged inside the first annular groove 401; the heat exchange access hole 701-5 and the heat exchange outlet hole 701-6 are distributed along the two ends of the diameter of the static pole shoe assembly 4, and the heat exchange access hole 701-5 is adjacent to the magnetic fluid input hole 701-7, and the heat exchange outlet hole 701-6 is adjacent to the magnetic fluid recovery hole 701-4, so as to facilitate the coolant in the heat exchange tube to exchange heat with the magnetic fluid in the first annular groove 401.

[0073] In this embodiment, the oil mist pressure sensor is arranged on the oil mist pressure detection hole 702-3, and the oil mist pressure sensor detects the oil mist pressure in the oil guide groove cover plate 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 oil mist temperature and humidity integrated sensor is arranged on the oil mist temperature and humidity connection hole 702-2, and the oil mist temperature and humidity integrated sensor detects the temperature and humidity of the oil mist in the oil guide groove cover plate of the hydro-generator set through the oil mist temperature and humidity detection hole 702-2; the oil mist concentration sensor is arranged on the oil mist concentration detection hole 702-7, and the oil mist concentration sensor detects the temperature and humidity of the oil mist in the oil guide groove cover plate of the hydro-generator set through the oil mist concentration detection hole 70 2-7 The concentration of oil mist in the oil guide groove cover of the hydro-turbine generator set is detected; the oil mist generator is arranged on the oil mist generating hole 702-1, and the oil mist generated by the oil mist generator is input into the interior of the oil guide groove cover of the hydro-turbine generator set through the oil mist generating hole 702-1; the oil mist collecting device is arranged on the oil mist collecting hole 702-5, and the oil mist can be discharged from the interior of the oil guide groove cover of the hydro-turbine generator set through the oil mist collecting hole 702-5; the oil mist discharged through the oil mist collecting hole 702-5 forms a cycle with the oil mist entering through the oil mist generating hole 702-1, so as to form oil mist of a certain pressure, temperature and concentration inside the oil groove cover of the hydro-turbine generator set.

[0074] The magnetic fluid temperature sensor is arranged on the magnetic fluid temperature hole 701-1, and the magnetic fluid temperature sensor detects the temperature of the magnetic fluid in the first annular groove 401 through the magnetic fluid temperature detection channel; the safety liquid level detection sensor is arranged on the safety liquid level detection hole 701-3, and the safety liquid level detection sensor detects the liquid level height of the magnetic fluid in the first annular groove 407 through the safety liquid level detection hole 701-3; the magnetic fluid viscosity sensor is arranged on the magnetic fluid viscosity hole 701-2, and the magnetic fluid viscosity sensor detects the viscosity of the magnetic fluid in the first annular groove 401 through the magnetic fluid viscosity detection hole 701-2; the magnetic liquid input device is arranged on the magnetic fluid The magnetic fluid is input into the first annular groove 401 through the magnetic liquid input device and the magnetic fluid input hole 701-7; the magnetic liquid recovery device is arranged on the magnetic fluid recovery hole 701-4, and the magnetic liquid recovery device recovers the magnetic fluid in the first annular groove 401 through the magnetic fluid recovery hole 701-4; one end of the heat exchange tube in the magnetic fluid heat exchange system is connected 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, and the other end of the heat exchange tube is connected 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.

[0075] Based on the above embodiments, the magnetic field strength, dust concentration, particle size distribution and temperature data in the oil guide groove cover of the hydro-turbine generator set are collected through the data acquisition system, the temperature, liquid level 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, and the magnetic liquid and oil mist in the oil guide groove cover of the hydro-turbine generator set are replenished or discharged through the control system, thereby changing the pressure of the magnetic liquid and oil mist in the oil guide groove cover of the hydro-turbine generator set.

[0076] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic fluid sealing structure for an oil guide groove cover of a hydro-turbine generator set, comprising a main shaft, a side wall of which is sleeved with an annular base, characterized in that: The magnetic fluid sealing structure also includes: a rotating shaft pole shoe assembly and a static pole shoe assembly; The shaft pole shoe assembly is sleeved on the outside of the main shaft, and the shaft pole shoe assembly includes four equiangular shaft pole shoes of split type, and the four shaft pole shoes are connected end to end to form a ring-shaped shaft pole shoe assembly, and the lower surface of each shaft pole shoe is provided with an arc-shaped shaft sealing boss, and the outer side of each shaft sealing boss is provided with sealing teeth; The static pole shoe assembly is sleeved on the outside of the main shaft, and the static pole shoe assembly is installed on the upper surface of the base. The upper surface of the annular static pole shoe assembly is provided with a first ring groove, a second ring groove and a third ring groove from the outside to the inside, and the depths and sizes of the first ring groove, the second ring groove and the third ring groove are different. A magnetic fluid is arranged in the first ring groove, and the first ring groove cooperates with the sealing tooth, and the sealing tooth extends into the interior of the magnetic fluid, and the third ring groove cooperates with the sealing boss of the rotating shaft; a placement ring 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 static pole shoe, a second static pole shoe, a third static pole shoe and a safety drainage pole shoe connected end to end, the first static pole shoe, the second static pole shoe and the third static pole shoe have the same structure, the first static pole shoe, the second static pole shoe and the third static pole shoe are all provided with a first channel hole inside, and the first static pole shoe, the second static pole shoe, the third static pole shoe The pole shoe and the safety drain pole shoe are both provided with a second channel hole inside, and the three first channel holes and the four second channel holes are all connected to the first annular groove; the safety drain pole shoe is provided with a drainage channel hole, and one end of the drainage channel hole is connected to the second annular groove; the middle of the outer diameter of the first stationary pole shoe, the second stationary pole shoe, the third stationary pole shoe and the safety drain pole shoe are penetrated with an oil mist through hole, and the oil mist through holes on the first stationary pole shoe, the second stationary pole shoe and the third stationary pole shoe are symmetrically provided with magnetic fluid through holes on both sides, and the magnetic fluid through holes are respectively connected to the first annular groove through the corresponding first channel hole or the second channel hole; the oil mist through hole on the safety drain pole shoe is symmetrically provided with magnetic fluid through holes and drainage through holes on both sides, the magnetic fluid through hole on the safety drain pole shoe is connected to the first annular groove through the second channel hole provided thereon, and the drainage through hole on the safety drain pole shoe is connected to the second annular groove through the drainage channel hole; The base comprises four base ring petals of equal angles connected end to end, an oil mist groove is provided on the inner side of each base ring petal, an internal oil mist channel is provided inside each base ring petal, one end of each internal oil mist channel is connected to the oil mist groove, and the other end of each internal oil mist channel is connected to the corresponding oil mist through hole.

2. The magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-generator set according to claim 1 is characterized in that: The four oil mist through holes include two oil mist detection holes and two breathing valve holes, and the two breathing valve holes are respectively arranged at the radial ends of the static pole shoe assembly.

3. The magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-generator set according to claim 2 is characterized in that: 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, wherein the magnetic fluid inlet and the magnetic fluid outlet are respectively arranged at the radial ends of the static pole shoe assembly, and the coolant inlet and the coolant outlet are respectively arranged at the radial ends of the static pole shoe assembly.

4. The magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-generator set according to claim 3 is characterized in that: One end of each of the oil mist internal channels passes through the outer wall of the base, and a plug is provided at the end of each of the oil mist internal channels; one end of each of the first channel holes, each of the second channel holes, and the drainage channel hole passes through the outer wall 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 drainage channel hole.

5. The comprehensive test bench for magnetic fluid seal of oil guide groove cover of hydro-turbine generator set is characterized by: Used to test the magnetic fluid sealing structure of the oil guide groove cover plate of the hydro-turbine generator set according to any one of claims 1 to 4, the comprehensive test bench comprises: The support assembly comprises a T-shaped platform, a gearbox support frame is provided on one side above the T-shaped platform, and a connecting hole is provided on one side of the gearbox support frame; The transmission system is arranged above the T-type stage, and includes a variable frequency motor, the output end of the variable frequency motor extends to the connection hole, and is connected to 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 to a torque sensor through a gearbox shaft expansion sleeve, the torque sensor is connected to a diaphragm coupling through a flange connection adapter, one end of the diaphragm coupling is provided with a spline shaft expansion sleeve, the spline shaft expansion sleeve is provided inside a spline shaft, and one end of the spline shaft is connected to the main shaft; A bearing base is sleeved on the outside of the main shaft, and the bearing base is installed above the gearbox support frame. The top of the bearing base is provided with a base drainage 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 drainage 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 drainage hole are evenly arranged on the bearing base at equal angles; An oil collecting ring assembly is arranged between the main shaft and the bearing base, and 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, and 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 form a ring-shaped oil collecting ring assembly, and 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 are all provided with oil collecting grooves, and the interiors of the first oil collecting flap, the second oil collecting flap, the third oil collecting flap and the fourth oil collecting flap are all provided with two oil collecting ring internal channels, and the eight oil collecting ring internal channels are all The oil collecting ring is connected to the oil collecting groove, and the other ends of the internal channels of the eight oil collecting rings are respectively connected to the corresponding second base through holes; the outer sides of the upper surfaces of the first oil collecting petal, the second oil collecting petal, the third oil collecting petal and the fourth oil collecting petal are penetrated with two oil collecting ring through holes, the oil collecting ring through holes and the internal channels of the oil collecting ring are staggered, and the oil collecting ring through holes and the internal channels of the oil collecting ring are evenly distributed on the annular oil collecting ring assembly, seven of the eight oil collecting ring through holes are respectively connected to the corresponding first base through holes, and one of the eight oil collecting ring through holes is connected to the base drainage hole; The sealing gland assembly is arranged on the top of the bearing base. The sealing gland assembly includes four petal-type sealing glands with equal angles. Each sealing gland is provided with a gland through hole, wherein the two spaced gland through holes are respectively a dust generating device hole and a dust collecting device hole; the tops of the four petal sealing glands are commonly connected with a sealing top cover, and a leakage collection hole is penetrated in 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, and the three first channel holes, the four second channel holes and the drainage channel holes on the static pole shoe assembly are respectively connected with the eight oil collecting ring through holes; wherein the drainage channel hole is connected with the drainage hole of the base through the oil collecting ring through hole; The heat preservation box is a hollow structure, which is arranged outside the sealing gland assembly, and one end of the heat preservation box is connected to the bearing base. A plurality of mounting holes are arranged on the top cover of the heat preservation box, and the plurality of mounting holes are respectively used to install 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 sealing 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 magnetic fluid data collection part, a leakage collection part and a torque sensor arranged on the transmission system; the magnetic field data collection part is composed of a magnetic field intensity sensor, and the magnetic field sensor is installed in a cavity formed by a sealing gland and an insulation box through a magnetic field sensor pipeline; 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 through the dust particle size / concentration detection pipeline and the temperature detection pipeline through the insulation box top cover; 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 the three second base through holes on the bearing base, and the oil mist pressure sensor, the oil mist temperature The 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 hole; 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, which are respectively installed on the three first base through holes, and the magnetic fluid temperature sensor, the safety liquid level detection sensor and the magnetic fluid viscosity sensor are connected to the first ring groove through the first base through hole, the oil collecting ring through hole and the first channel hole; the leakage collection part includes a leakage collection container, which is connected to the inside of the sealing gland assembly through the leakage collection pipe on the insulation 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 reducer through the gear box shaft expansion sleeve, and the output end of the torque sensor is connected to the main shaft through the flange connection adapter, the diaphragm coupling, the spline shaft expansion sleeve and the spline shaft; The control system includes a variable frequency motor controller, an oil mist generator, an oil mist collecting device, a dust generating device, a dust recovery device, a temperature control system, a magnetic liquid supply, replenishment and drainage automatic control system, and a magnetic liquid heat exchange system; the variable frequency motor controller controls the variable frequency motor installed above the T-stage to provide power for the main shaft rotation; the oil mist generator and the oil mist collecting device are respectively installed on the two second base through holes, and the oil mist generator and the oil mist collecting device are both connected to the oil collecting tank through the second base hole and the internal channel of the oil collecting ring; the dust generating device and the dust recovery device pass through the top cover of the insulation box through the dust inlet pipe and the dust outlet pipe respectively, and are respectively installed on the dust generating device hole and the dust collecting device hole; the temperature control system includes an external temperature control device, which is connected to the dust generating device hole and the dust collecting device hole through the hot air inlet pipe installed on the insulation box and the hot air inlet pipe installed on the insulation box The air outlet pipe is connected to the internal cavity of the insulation box; the magnetic liquid supply, replenishment and drainage automatic control system consists of a magnetic liquid input device and a magnetic liquid recovery device, which are respectively installed on the two first base through holes, and the magnetic liquid input device and the magnetic liquid recovery device are both connected to the first ring groove through the first base through hole, the oil collecting ring through hole and the second channel hole; the magnetic liquid heat exchange system includes a heat exchange tube arranged inside the first ring groove, one end of the heat exchange tube is connected to the first channel hole on the static pole shoe assembly, and one end of the heat exchange tube 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 tube is connected to the second channel hole on the static pole shoe assembly, and the other end of the heat exchange tube is connected to the heat exchange outlet through the second channel hole, the oil collecting ring through hole and the first base through hole.

6. The integrated test bench for magnetic fluid seal of oil guide groove cover of hydraulic generator set according to claim 5 is 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 opened at the top of the bearing base; the eight second base through holes are respectively an oil mist generating hole, an oil mist temperature and humidity connecting hole, an oil mist pressure detection hole, a first breathing valve hole, an oil mist collecting 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 opened at the top of the bearing base.

7. The integrated test bench for magnetic fluid seal of oil guide groove cover of hydraulic generator set according to claim 6 is characterized in that: The first breathing valve hole and the second breathing valve hole are both provided with breathing valves, and the first breathing valve hole and the second breathing valve hole are respectively arranged at the radial ends of the bearing base, the magnetic fluid input hole and the magnetic fluid recovery hole are respectively arranged at the radial ends of the bearing base, and the heat exchange access hole and the heat exchange outlet hole are respectively arranged at the radial ends of the bearing base.

8. The integrated test bench for magnetic fluid seal of oil guide groove cover of hydraulic generator set according to claim 7 is characterized in that: The oil mist pressure sensor is arranged on the oil mist pressure detection hole, and the oil mist pressure sensor detects the oil mist pressure in the oil guide groove cover plate of the 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 arranged on the oil mist temperature and humidity connection hole, and the oil mist temperature and humidity integrated sensor detects the temperature and humidity of the oil mist in the oil guide groove cover plate of the 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 arranged on the oil mist concentration detection hole, and the oil mist concentration sensor detects the concentration of the oil mist in the oil guide groove cover plate of the turbine generator set through the oil mist concentration detection hole and the internal channel of the oil collecting ring; the oil mist generator is arranged on the oil mist generating hole, and the oil mist generated by the oil mist generator inputs the oil mist into the interior of the oil guide groove cover plate of the turbine generator set through the oil mist generating hole and the internal channel of the oil collecting ring; the oil mist collecting device is arranged on the oil mist collecting hole, and ensures that the oil mist can be discharged from the interior of the oil guide groove cover plate of the turbine generator set through the oil mist collecting hole and the internal channel of the oil collecting ring; The magnetic fluid temperature sensor is arranged on the magnetic fluid temperature hole, and the magnetic fluid temperature sensor detects the temperature of the magnetic fluid in the first ring groove through the magnetic fluid temperature detection channel; the safety liquid level detection sensor is arranged on the safety liquid level detection hole, and the safety liquid level detection sensor detects the liquid level height of the magnetic fluid in the first ring groove through the safety liquid level detection hole and the oil collecting ring through hole; the magnetic fluid viscosity sensor is arranged on the magnetic fluid viscosity hole, and the magnetic fluid viscosity sensor detects the viscosity of the magnetic fluid in the first ring groove through the magnetic fluid viscosity detection hole and the oil collecting ring through hole; The magnetic fluid input device is arranged on the magnetic fluid input hole, and the magnetic fluid is input into the first annular groove through the magnetic liquid input device and the magnetic fluid input hole; the magnetic liquid recovery device is arranged on the magnetic fluid recovery hole, and the magnetic liquid recovery device recovers the magnetic fluid in the first annular groove through the magnetic fluid recovery hole and the oil collecting ring through hole; one end of the heat exchange tube in the magnetic fluid heat exchange system is connected with the heat exchange access hole, and the coolant is input into the heat exchange tube through the heat exchange access hole, and the other end of the heat exchange tube is connected with the heat exchange outlet hole, and the coolant in the heat exchange tube is discharged through the heat exchange outlet hole.

9. The integrated test bench for magnetic fluid seal of oil guide groove cover of hydraulic generator set according to claim 8 is characterized in that: A support bearing is installed at the bottom end of the bearing base, a protrusion is provided below the main shaft, and the main shaft is overlapped on the support bearing through the protrusion, and the shaft ring of the support bearing is installed on the outer circumferential surface of the main shaft, and the lower end of the main shaft extends to the inside of the gearbox support frame and is connected to the spline shaft; an upper shaft shoulder and a lower shaft shoulder are provided on the main shaft, and a mounting groove is opened inside the bearing base, and the bottom of the mounting groove corresponds to the lower shaft shoulder; a guide bearing is provided between the main shaft and the bearing base, and the inner ring of the guide bearing is arranged on the lower shaft shoulder of the main shaft, and the outer ring of the guide bearing is arranged in the mounting groove; a guide bearing inner ring pressure ring is provided at the upper shaft shoulder of the main shaft, and the bearing inner ring pressure ring is connected to the inner ring of the guide bearing; a bearing outer ring pressure ring is provided at the top of the mounting groove, and the bearing outer ring pressure ring is connected to the outer ring of the guide bearing.

10. The integrated test bench for magnetic fluid seal of oil guide groove cover of hydraulic generator set according to claim 9 is characterized in that: The outer circumferential surface of the oil collecting ring assembly is tightly attached to the inner circumferential 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. The outer circumferential surface of the static pole shoe assembly is provided with a mounting boss, and a flange connecting hole is opened on the mounting boss. The static pole shoe assembly is connected to the bearing base through the flange connecting hole and bolts.

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