A ducted high-speed differential pressure turbine expander

Abstract

The application discloses a pipeline type high-speed differential pressure turbine expander, which comprises an air inlet pipeline, an impeller chamber, a differential planetary transmission structure and an expansion pipeline section. The impeller chamber comprises an impeller left chamber and an impeller right chamber. The impeller left chamber comprises a bidirectional motor assembly, a first mounting assembly and a guide wheel assembly. The guide wheel assembly comprises guide wheel blades and a guide wheel hub body. The impeller right chamber comprises a generator assembly, a main impeller assembly and a second mounting assembly. The generator assembly is coaxially arranged at the outer edge of the main impeller assembly and simultaneously recovers energy of the impeller in a rim driving mode. The guide wheel hub body and the main impeller hub body are connected through the differential planetary transmission structure, and the rotational speed of the guide wheel and the main impeller is adjusted through control of the gear transmission ratio. The application stably integrates electric energy into a power grid, avoids shaft seal leakage, increases the flow area of medium, has the effect of vibration and noise reduction, simultaneously reduces maintenance cost and prolongs service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of axial flow turbine expander design, in particular to a pipeline type high-speed differential pressure turbine expander. BACKGROUND

[0002] At present, air separation equipment, natural gas (petroleum gas) liquefaction separation equipment and low-temperature pulverizing equipment and the like obtain cold energy mainly by means of turbine expanders. Turbine expanders are mainly divided into axial flow turbine expanders and centrifugal turbine expanders. They mainly transfer energy through the connection of impellers and rotating shafts. Most turbine expanders adopt sliding bearings. When the shaft rotates, an oil wedge is formed between the shaft neck and the bearing. The oil in the oil wedge slightly lifts the shaft, and an oil film is formed between the shaft neck and the bearing. With the rotation of the shaft neck, the oil film rotates. The change of the gap causes the thickness of the oil film to change periodically, which causes so-called "oil film vortex vibration". If the oil film is damaged, mechanical friction will occur, causing bush burning, and even causing seal damage.

[0003] The pipeline type high-speed differential pressure technology discards the form of energy transmission by shaft of the traditional turbine expander, and adopts the way of rim drive. A bidirectional motor serves as an auxiliary system to provide driving force for the guide wheel. The guide wheel is positively rotated and reversely rotated to provide a stable flow direction for the main impeller according to the load requirement. A generator serves as a main system to convert the kinetic energy of the gas into electric energy. Meanwhile, the guide wheel hub body and the main impeller hub body are connected through a differential planetary transmission device to rotate at different speeds. High-temperature high-pressure supercritical gas enters the inlet pipeline through a filter and a three-way electromagnetic valve, is accelerated in the guide wheel, and then rushes into the main impeller to make the blades rotate, thereby pushing the main impeller to do work to the outside and converting the kinetic energy of the gas into electric energy. The generator adopts a high-speed permanent magnet synchronous generator. This structure not only avoids the leakage problem of shaft seal to make the internal structure more compact, but also increases the flow area of the medium, makes the internal flow more stable, has the effect of reducing vibration and noise, reduces the maintenance cost, and prolongs the service life. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a pipeline type high-speed differential pressure turbine expander which discards the form of energy transmission by shaft of the traditional turbine expander, and adopts the way of rotation of the guide wheel and the main impeller to transfer energy.

[0005] The object of the present application can be achieved by the following technical solutions.

[0006] The pipeline type high-speed differential pressure turbine expander comprises an air inlet pipeline, an impeller chamber, a differential planetary transmission structure and a diffuser section; the air inlet pipeline is connected with one end of the impeller chamber, and the other end of the impeller chamber is fixedly connected with the diffuser section; characterized in that the impeller chamber comprises a left impeller chamber and a right impeller chamber; a guide wheel assembly, a bidirectional motor assembly and a first mounting assembly are arranged in the left impeller chamber; the guide wheel assembly comprises guide wheel blades and a guide wheel hub body; the guide wheel blades and the guide wheel hub body are coaxially arranged in the left impeller chamber; a plurality of guide wheel blades with adjustable attack angles are equidistantly arranged on the outer edge of the guide wheel hub body in the circumferential direction; one end of the guide wheel blades is connected with the guide wheel hub body, and the other end is connected with the inner wall of the bidirectional motor assembly; the bidirectional motor assembly comprises a guide wheel rotor and a guide wheel stator winding; one end of the guide wheel rotor is integrally connected with the guide wheel assembly, and the other end is connected with the guide wheel stator winding; the guide wheel stator winding is fixed by a set of symmetrically arranged fixed plates at both ends; the guide wheel stator winding and the fixed plates are fixedly arranged in an annular mounting seat; the first mounting assembly comprises an annular mounting seat and two annular support bodies; the annular support bodies are fixedly connected with the inner wall of the left impeller chamber; the annular mounting seat is fixedly connected with the inner wall of the left impeller chamber and arranged between the two annular support bodies; the bidirectional motor assembly is arranged in the annular mounting seat; a first air floating bearing for rotation of the guide wheel assembly is formed between the two annular support bodies; and a ring-shaped sealing element is arranged between the first air floating bearing and the annular support bodies; a main impeller assembly, a generator assembly and a second mounting assembly are arranged in the right impeller chamber; the main impeller assembly, the generator assembly, the second mounting assembly and the right impeller chamber are coaxially arranged; the main impeller assembly comprises main impeller blades and a main impeller hub body; one end of the main impeller blades is fixedly connected with the main impeller hub body, and the other end is connected with the inner wall of the generator assembly; the outer end of the main impeller hub body is processed into an outer gear ring; the generator assembly comprises a generator rotor and a generator stator winding; one end of the generator rotor is integrally connected with the main impeller assembly; the generator stator winding is fixedly connected with the inner wall of the right impeller chamber and arranged between two support hubs; the second mounting assembly comprises a second air floating bearing and a sealing assembly; the second air floating bearing is arranged at the axial both ends of the generator rotor; and the sealing assembly is arranged between the second air floating bearing, the stator winding and the support hub.

[0007] In the pipeline type high-speed differential pressure turbine expander, the bidirectional motor assembly serves as an auxiliary device to provide driving power for the guide wheel assembly and plays a role in frequency modulation; based on the required load, when the output load is lower or higher than the required load, the bidirectional motor controls the forward rotation or reverse rotation of the guide wheel assembly to provide a stable flow direction for the main impeller assembly, so as to realize stable output; the guide wheel blades can adjust the blade angle according to the bolts on the guide wheel hub body and the bidirectional motor assembly, which provides a non-pre-rotation inlet condition for the main impeller assembly, so that the flow of the medium is more stable.

[0008] The pipeline type high-speed differential pressure turbine expander, wherein the energy distribution between the guide wheel blades and the main impeller blades can be expressed by a reaction degree p, and the reaction degree p needs to satisfy p min < p < p max，

[0009] p min and p max can be expressed as:

[0010]

[0011] In the above formula, Ψ and is a velocity coefficient, Ψ = 0.75-0.90; β1 is a main impeller inlet angle, β1 = 60°-85°; α1 is a guide wheel outlet angle, α1 = 12°-30°; m is an auxiliary coefficient, m = 1.1-1.4; and the characteristic ratio is expressed as:

[0012]

[0013] wherein u1 is an actual impeller outer edge line speed, and c0 is a theoretical speed under turbine isentropic expansion;

[0014] The pipeline type high-speed differential pressure turbine expander, wherein the guide wheel hub body and the main impeller hub body are connected through a differential planetary transmission structure, wherein the differential planetary transmission structure adopts a planetary structure, an inner gear ring is machined in an end portion of the guide wheel hub body, an outer gear ring at an outer extension shaft end portion of the main impeller hub body is used as a sun gear of a planetary gear, three planetary gears are arranged between the inner gear ring and the sun gear and distributed along an axial direction, and a differential planetary transmission device is formed, which functions to enable high-speed rotation of the guide wheel and the main impeller under adjustable rotation speed, eliminate axial force, and improve generator efficiency. In the differential planetary transmission structure, grease lubrication is adopted, which has the advantages of not needing any additional lubrication device, being not easy to leak, and simple structure.

[0015] The pipeline type high-speed differential pressure turbine expander, wherein the bidirectional motor assembly, the guide wheel assembly, the generator assembly and the main impeller assembly are all driven by a rim driving mode to perform energy conversion; the transmission between the structures inside the above structure discards the traditional transmission form through a shaft, reduces the problems of friction, lubrication and wear in mechanical transmission, and improves the reliability and stability of the transmission.

[0016] The pipeline type high-speed differential pressure turbine expander, wherein the inlet pipeline, the impeller chamber and the diffuser pipe section are installed on the same axis.

[0017] The pipeline type high-speed differential pressure turbine expander, wherein the outer wall of the left chamber of the impeller is provided with a wire interface, and the stator winding of the inducer is electrically connected with an external power source through the wire interface.

[0018] The pipeline type high-speed differential pressure turbine expander, wherein the generator assembly is a high-speed permanent magnet synchronous generator, and the first and second air floating bearings are arc air floating bearings.

[0019] The pipeline type high-speed differential pressure turbine expander, wherein the sealing assembly is a rigid labyrinth seal or a carbon ring mechanical seal.

[0020] The present application comprises the following advantages and features:

[0021] 1. The pipeline type high-speed differential pressure turbine expander provided by the present application has few flow parts and compact internal structure, and the impeller of the turbine expander is directly connected with the rotor of the generator without a transmission shaft, thereby solving the problems of complex internal flow channel structure and large space occupation of the turbine expander caused by the direct connection of the transmission shaft and the generator rotor, avoiding the leakage of shaft seal, and increasing the flow area of the medium.

[0022] 2. The outer edge of the inducer is provided with a bidirectional motor, which serves as an auxiliary system and provides driving force for the inducer, and realizes the forward rotation or reverse rotation of the inducer according to the load requirement to provide a stable flow direction for the main impeller. Meanwhile, when the medium flow is unstable, the inducer blade angle can be adjusted according to the load requirement, which provides a non-pre-rotation inlet condition for the main impeller.

[0023] 3. The energy conversion between the bidirectional motor assembly and the inducer assembly and between the generator assembly and the main impeller assembly is realized through the rim driving mode. This structure not only makes the internal structure more compact, but also has the effects of vibration reduction and noise reduction, reduces the maintenance cost, and prolongs the service life.

[0024] 4. The inducer and the main impeller rotate in the form of differential planetary transmission structure, and the differential planetary transmission structure is arranged between the hub body of the inducer and the hub body of the main impeller, so as to realize the speed regulation between the inducer and the main impeller according to a certain transmission ratio.

[0025] 5. Compared with the existing shaftless pump and spray technology, the pipeline type high-speed differential pressure turbine expander can rotate the attack angle of the blade according to the load requirement, so as to maintain the best coordination relationship with the main impeller.

[0026] 6. The pipeline type high-speed differential pressure turbine expander has compact structure, high efficiency and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1is a structural schematic diagram of a pipeline type high-speed differential pressure turbine expander of the present application.

[0028] Figure 2 is a three-dimensional structural schematic diagram of a pipeline type high-speed differential pressure turbine expander of the present application.

[0029] Figure 3 is a structural schematic diagram of a left chamber driving device of an impeller of the present application.

[0030] Figure 4 is a structural schematic diagram of a right chamber power generation device of an impeller of the present application.

[0031] Figure 5 is a structural schematic diagram of a planetary transmission device shown in part A-A of the present application. Figure 1

[0032] Figure 6 is a structural schematic diagram of a gas bearing and partial structure of a generator of the present application.

[0033] In the figure: intake pipeline 1; impeller chamber 2; left chamber 21 of the impeller; right chamber 22 of the impeller; diffuser pipe section 3; guide vane assembly 4; guide vane blade 41; guide vane hub body 42; bidirectional motor assembly 5; guide vane rotor 51; guide vane stator winding 52; first mounting assembly 6; annular mounting seat 61; fixed plate 62; first gas bearing 63; annular sealing element 64; annular support body 65 (including two parts 65a and 65b); main impeller assembly 7; main impeller blade 71; main impeller hub body 72; generator assembly 8; generator rotor 81; generator stator winding 82; second mounting assembly 9; second gas bearing 91; gas bearing block 911; gas bearing seat 912; sealing assembly 92; trapezoidal sealing element 921; stepped sealing element 922; support hub 93 (including two parts 93a and 93b); differential planetary transmission structure 10; planetary gear 101; sun gear 102; inner gear ring 103; planet carrier 104. DETAILED DESCRIPTION

[0034] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0035] One embodiment of the present application is a pipeline type high-speed differential pressure turbine expander, the structure of which is shown in Figure 1 the figure, including an intake pipeline 1, an impeller chamber 2, a differential planetary transmission structure 10, and a diffuser pipe section 3. The intake pipeline 1 is connected to one end of the impeller chamber 2, and the other end of the impeller chamber 2 is fixedly connected to the diffuser pipe section 3. The impeller chamber 2 includes a left chamber 21 of the impeller and a right chamber 22 of the impeller. As​Figure 3 The impeller left chamber 21 is provided with a flow guide wheel assembly 4, a bidirectional motor assembly 5, and a first mounting assembly 6. The flow guide wheel assembly 4 includes flow guide wheel blades 41 and a flow guide wheel hub body 42. The flow guide wheel blades 41 and the flow guide wheel hub body 42 are coaxially arranged with the impeller left chamber 21. A plurality of attack angle adjustable flow guide wheel blades 41 are equidistantly arranged on the outer edge of the flow guide wheel hub body 42 in a circle. One end of the flow guide wheel blades 41 is connected to the flow guide wheel hub body 42, and the other end is connected to the inner wall of the bidirectional motor assembly 5. The bidirectional motor assembly 5 includes a flow guide wheel rotor 51 and a flow guide wheel stator winding 52. The flow guide wheel stator winding 52 is fixed by a set of symmetrically arranged fixed plates 62, and the flow guide wheel stator winding 52 and the fixed plates 62 are fixedly arranged in an annular mounting seat 61. The first mounting assembly 6 includes the annular mounting seat 61, the fixed plates 62, a first air floating bearing 63, an annular sealing element 64, and two annular support bodies 65 (65a and 65b). The bidirectional motor assembly 5 is mounted in the annular mounting seat 61.

[0036] As Figure 4 The impeller right chamber 22 is provided with a main impeller assembly 7, a generator assembly 8, and a second mounting assembly 9. The main impeller assembly 7, the generator assembly 8, the second mounting assembly 9, and the impeller chamber 2 are coaxially arranged. The main impeller assembly 7 includes main impeller blades 71 and an impeller hub body 72. One end of the main impeller blades 71 is fixedly connected to the impeller hub body 72, and the other end is connected to the generator assembly 8. The outer end of the impeller hub body 72 is processed into an outer gear ring. The generator assembly 8 includes a generator rotor 81 and a generator stator winding 82. The generator stator winding 82 is fixedly connected to the inner wall of the impeller right chamber 22 and is arranged between two support hubs 93 (93a and 93b). The mounting assembly 9 includes a second air floating bearing 91, a sealing assembly 92, and the support hubs 93 (93a and 93b). The generator rotor 81 is provided with the second air floating bearing 91 at both axial ends. The sealing assembly 92 is arranged between the second air floating bearing 91, the generator stator winding 82, and the support hubs 93 (93a and 93b).

[0037] The sealing assembly 92 includes a trapezoidal sealing element 921 and a stepped sealing element 922. By arranging the sealing element 92, the generator rotor 81 can always maintain good sealing performance with the generator stator winding 82 during rotation, effectively avoiding gas infiltration to affect normal driving.

[0038] One end of the inlet pipe 1 is fixedly connected to the impeller chamber 2, and the other end of the impeller chamber 2 is fixedly connected to the diffuser pipe section 3. The connection methods include but are not limited to bolt connection, welding, etc.

[0039] As Figure 5The differential planetary transmission structure 10 is used to realize the high-speed rotation of the guide vane 41 and the main vane 71 at different rotating speeds, and to balance the rotation. The differential planetary transmission structure 10 is composed of the inner gear ring 103, the sun gear 102, the planetary gears 101 and the planet carrier 104. The differential planetary transmission structure 10 is used to realize the high-speed rotation of the guide vane 41 and the main vane 71 at different rotating speeds, and to balance the rotation.

[0040] The energy distribution between the guide vane 41 and the main vane 71 can be represented by the reaction degree p, and the reaction degree p should satisfy p min <ρ<ρ max，

[0041] ρ min and p max can be represented as:

[0042]

[0043] In the above formula, Ψ and is the velocity coefficient, Ψ = 0.75-0.90; β1 is the inlet angle of the main vane, β1 = 60°-85°; α1 is the outlet angle of the guide vane, α1 = 12°-30°; the outlet angle α1 of the guide vane can be adjusted according to the required load, so that the device always operates in the high-efficiency region; m is the auxiliary coefficient, m = 1.1-1.4; the characteristic ratio u1 is represented as:

[0044]

[0045] wherein, u1 is the actual vane outer edge linear velocity, and c0 is the theoretical velocity under the isentropic expansion of the turbine;

[0046] The bidirectional motor assembly 5 is used as an auxiliary device to provide driving power for the guide vane 41 and to realize frequency modulation. According to the required load, when the output load is lower or higher than the required load, the bidirectional motor is used to control the forward rotation or reverse rotation of the guide vane 41 to provide a stable flow direction for the main vane 71, so as to realize stable output. The vane angle of the guide vane 41 can be adjusted according to the bolts on the hub body 42 and the rim of the bidirectional motor assembly 5, which is used to provide a non-pre-rotation inlet condition for the main vane 71, so as to make the flow of the medium more stable.

[0047] The two ends of the bidirectional motor and generator rotor are respectively provided with a pair of arc-shaped air floating bearings, which realize high-speed rotation of the impeller in the impeller chamber 2 and simultaneously support the impeller. Figure 6 The second air floating bearing 91 of the generator part is shown in the structural schematic view, the air floating block 911 and the air floating seat 912 are designed as a whole, the air floating block 911 is coaxially arranged with the generator rotor 81 and is uniformly distributed in the circumferential direction at the outer edge of the end portion, and the air floating seat 912 has good compression resistance and wear resistance.

[0048] After the high-speed gas is accelerated in the left chamber 21 of the impeller, the high-speed gas rushes into the right chamber 22 of the impeller to rotate the main impeller blade 71, so that the main impeller blade 71 does work to the outside. Compared with the traditional shaft turbine expander, the shaftless design greatly reduces the friction, lubrication and wear problems existing in mechanical transmission, and improves the reliability and stability of the transmission.

[0049] The tail part of the main impeller hub body 72 is designed as a water discharge cone shape, and the purpose is to guide the flow of the medium.

[0050] The working principle of the present application is as follows: after the high-speed gas passes through the gas inlet pipe, the bidirectional motor assembly 5 provides driving force for the flow guide wheel rotor 51 in the left chamber 21 of the impeller, and according to the load requirement, the flow guide wheel rotor 51 is rotated forward or reversely to provide a stable flow direction for the main impeller blade 71, so that the high-speed gas obtains stable energy, and after being accelerated by the flow guide wheel rotor 51, the high-speed gas enters the main impeller blade 71 to rotate at high speed. The main impeller blade 71 rotates to drive the generator rotor 81 to rotate, a certain excitation current is input through the excitation system, so that the generator rotor becomes a rotating magnetic field, the generator stator winding 82 cuts the magnetic lines of force to move, an induced electromotive force is generated, and an electric current is generated. Further, the kinetic energy of the gas is converted into electric energy. The connection between the flow guide wheel hub body 42 and the main impeller hub body 72 adopts a differential planetary transmission structure 10, so that the rotation speed adjustment between the flow guide wheel blade 51 and the main impeller blade 71 is realized, and the efficiency of the generator of the turbine expander is effectively improved.

[0051] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made according to the application scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A pipeline-type high-speed differential pressure turbine expander, comprising an intake pipe, an impeller chamber, a differential planetary transmission structure, and a pressure diffuser section; the intake pipe is connected to one end of the impeller chamber, and the other end of the impeller chamber is fixedly connected to the pressure diffuser section; characterized in that: The impeller chamber includes an impeller left chamber and an impeller right chamber; the impeller left chamber is provided with an inducer assembly, a bidirectional motor assembly and a first mounting assembly; the inducer assembly includes inducer blades and an inducer hub body; a plurality of inducer blades with adjustable attack angles are arranged at equal intervals along the circumference on the outer edge of the inducer hub body; the bidirectional motor assembly includes an inducer rotor and an inducer stator winding; the two ends of the inducer stator winding are fixed by a group of symmetrically arranged fixing plates, the first mounting assembly includes an annular mounting seat and two annular supports, the inducer stator winding and the fixing plate are fixedly arranged in the annular mounting seat; the annular support body is fixedly connected to the inner wall of the impeller left chamber, the annular mounting seat is fixedly connected to the inner wall of the impeller left chamber and is arranged between the two annular supports, the bidirectional motor assembly is installed in the annular mounting seat, and a first air bearing for rotating the inducer assembly is formed between the two annular supports, the inner wall of the first air bearing is in contact with the outer edges of the end faces of the two ends of the bidirectional motor, and an annular seal is provided between the outer edge of the first air bearing and the annular support body; The right impeller chamber is provided with a main impeller assembly, a generator assembly and a second mounting assembly; the main impeller assembly includes main impeller blades and a main impeller hub body, the end of the main impeller hub body extending outward is processed into an external gear ring, the generator assembly includes a generator rotor and a generator stator winding, the generator stator winding is fixedly connected to the outer wall of the right impeller chamber and is arranged between two supporting hubs, the second mounting assembly includes a second air bearing and a sealing assembly, the second air bearings are provided at both axial ends of the generator rotor, and the sealing assembly is arranged between the second air bearing, the generator stator winding and the supporting hub; The bidirectional motor assembly serves as an auxiliary device to provide driving power for the inducer assembly and plays a role in frequency modulation. Based on the required load, when the output load is lower than or higher than the required load, the bidirectional motor controls the forward or reverse rotation of the inducer assembly to provide a stable incoming flow direction for the main impeller assembly, thereby achieving stable output. The inducer blades can adjust their blade angles according to the bolts on the inducer hub body and the bidirectional motor assembly, which provides a pre-swirl-free inlet condition for the main impeller assembly, thereby making the flow of the medium more stable. The energy distribution between the guide wheel blades and the main impeller blades can be expressed by the reaction degree ρ, and the reaction degree ρ must satisfy ρ min <ρ<ρ max， ρ min and ρ max Can be expressed as: ； In the above formula, Ψ and is the speed coefficient, Ψ=0.75~0.90; β1 is the main impeller inlet angle, β1 = 60° ~ 85°; α1 is the guide wheel outlet angle, α1 = 12° ~ 30°; m is the auxiliary coefficient, m = 1.1 ~ 1.4; characteristic ratio Expressed as: ； Among them, u1 is the actual impeller outer edge linear velocity, and c0 is the theoretical velocity under turbine isentropic expansion.

2. A pipeline high-speed differential pressure turbine expander according to claim 1, characterized in that: The guide wheel hub body and the main impeller hub body are connected by a differential planetary transmission structure, wherein the differential planetary transmission structure adopts a planetary structure, an inner gear ring is processed into an inner end portion of the guide wheel hub body, and an outer gear ring at the outer end portion of the main impeller hub body extending shaft serves as the sun gear of the planetary gear. Three planetary gears distributed along the axial direction are arranged between the inner gear ring and the sun gear, so that the guide wheel and the main impeller can achieve high-speed rotation at an adjustable speed, eliminate axial force, and improve the efficiency of the generator; The differential planetary transmission structure adopts grease lubrication.

3. The pipeline high-speed differential pressure turbine expander according to claim 1, characterized in that: The bidirectional motor assembly and guide wheel assembly, generator assembly and main impeller assembly are all integrated structures. The transmission between the above structures abandons the traditional form of transmission through the shaft, and instead adopts a rim drive method, which reduces the friction, lubrication and wear problems existing in mechanical transmission and improves the reliability and stability of the transmission; the generator assembly adopts a high-speed permanent magnet synchronous generator.

4. The pipeline high-speed differential pressure turbine expander according to claim 1, characterized in that: The first and second air bearings are arc-shaped air bearings, which are evenly distributed along the circumference of the guide wheel rotor and the generator rotor. The lubricant can be taken from the medium itself; the sealing assembly adopts a rigid labyrinth seal or a carbon ring mechanical seal.

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