Motor cooling unit and generator for gas turbine

Abstract

The utility model discloses a motor cooling unit and a generator for a gas turbine. The motor cooling unit comprises a stator cooling unit and a rotor cooling unit. The stator cooling unit comprises a spiral water tank arranged on the outer ring of the casing and a water jacket sleeved on the outer ring of the casing, and a spiral water-cooling closed cavity is formed between the casing and the water jacket; the rotor cooling unit comprises n axial oil ducts arranged in the rotor and oblique oil ducts corresponding to the axial oil ducts, the n axial oil ducts are parallel to the axis direction of the rotor and are arranged in the rotor by taking the axis of the rotor as a central symmetry line, and the axial oil ducts and the rotor hollow shaft hole are communicated through the oblique oil ducts; and a rear cover plate of the motor is provided with an oil outlet and an oil inlet. According to the utility model, a stator unit spiral water channel cooling mode and a rotor unit Z-shaped oil channel are adopted, so that the cooling efficiency of the generator is improved, and the temperature rise of the generator is controlled within a specified range.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas turbine generator, specifically relates to a motor cooling unit and generator for gas turbine. BACKGROUND

[0002] The generator for gas turbine realizes the dual functions of starting and power generation by utilizing the reversible principle of motor. Before the ignition of the gas turbine, the motor drives the gas turbine to accelerate to idle speed, and then the gas turbine is ignited by oil injection, which in turn drags the motor to generate electricity, thereby converting mechanical energy into electrical energy to meet the electrical energy requirements of the equipment. The motor is widely used in various industrial and daily equipment. Since heat is generated during operation, if the heat is not dissipated in time, the motor will be overheated, which will affect the efficiency and service life of the motor, and even cause failure. The task of motor cooling is to dissipate the heat generated by internal losses of the motor, so that the temperature rise of each part of the motor is maintained within the standard specified range, and the internal temperature is homogenized. Therefore, it is necessary to cool the motor to ensure its stable operation and prolong its service life.

[0003] The existing motor cooling schemes mainly include air cooling and liquid cooling. Generally, open-type motors use air in the environment to enter the motor interior for cooling, and the cold air directly takes away the heat of the motor and discharges it to the surrounding environment. The liquid cooling system usually designs a closed water channel in the motor interior, and uses liquid circulation to take away the heat. For example, the Chinese patent "Motor, power assembly, power equipment and motor cooling method" with application number 2017711083873.3 belongs to the traditional liquid cooling method.

[0004] However, for the generator for gas turbine used in air platforms or other special requirements, it needs to have the characteristics of compact structure and light weight, which leads to serious heat generation and makes it impossible to use the traditional cooling method for cooling. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of motor cooling unit and the technical scheme of generator for gas turbine, which can greatly improve the cooling efficiency of motor, and then compress the volume and weight of generator for gas turbine.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A motor cooling unit, the motor includes a housing, a stator unit and a hollow shaft structure rotor unit, the stator core of the stator unit is fixed on the inner ring of the housing, and the motor cooling unit includes a stator cooling unit and a rotor cooling unit.

[0008] The stator cooling unit comprises a spiral water groove arranged on the outer ring of the casing and a water jacket sleeved on the outer ring of the casing, sealing rings are arranged between the two sides of the spiral water groove and the casing, so that a spiral water cooling closed cavity is formed between the casing and the water jacket, the water jacket is provided with a water inlet and a water outlet, circulating water enters the water jacket from the water inlet and flows out from the water outlet through the spiral water groove;

[0009] The rotor cooling unit comprises n axial oil channels arranged in the rotor and inclined oil channels corresponding to the axial oil channels, the n axial oil channels are parallel to the axis direction of the rotor and are symmetrically arranged in the rotor with the axis of the rotor as the center, the inclined oil channels penetrate the axial oil channels and the hollow shaft hole of the rotor, and the rear cover plate of the motor is provided with an oil outlet and an oil inlet.

[0010] In the motor cooling unit, the oil inlet port of the inclined oil channel is arranged at the tail end of the axial oil channel, and the oil outlet port is arranged at the front end of the hollow shaft hole of the rotor.

[0011] In the motor cooling unit, an annular groove is arranged at the intersection of the oil outlet port of the inclined oil channel and the oil inlet port of the axial oil channel.

[0012] In the motor cooling unit, the rotor unit comprises a rotor front half shaft, a magnetic steel and a rotor rear half shaft, the magnetic steel is arranged on the outer ring of the rotor front half shaft, and the rotor rear half shaft is sleeved on the outer circle of the magnetic steel and the rotor front half shaft.

[0013] In the motor cooling unit, the annular groove is arranged on the end face of the rotor rear half shaft.

[0014] In the motor cooling unit, the axial oil channel and the inclined oil channel are arranged in the rotor front half shaft.

[0015] In the motor cooling unit, n=6-12.

[0016] In the motor cooling unit, the front end of the casing is provided with a front end cover, the outer ring of the front end cover is sealed with the stator unit by using a sealing ring, and a non-contact labyrinth sealing unit is arranged between the inner ring of the front end cover and the rotor unit.

[0017] In the motor cooling unit, the rear end of the casing is provided with a rear end cover, the outer ring of the rear end cover is sealed with the stator unit by using a sealing ring, and a non-contact labyrinth sealing unit is arranged between the inner ring of the rear end cover and the rotor unit.

[0018] A gas turbine generator comprises a gas turbine and a motor, and the motor cooling unit.

[0019] Compared with the prior art, the motor cooling unit has the beneficial effects as follows:

[0020] 1. The motor of the utility model adopts the cooling mode of water cooling and oil cooling compound, wherein the stator unit adopts the spiral water channel water cooling structure, the high specific heat capacity and good heat conduction performance of the cooling medium water evenly radiate the motor stator heat, the potential performance of the motor is maximized, and the output power of the motor under the unit weight and volume is improved; the rotor unit adopts the "Z" type oil channel cooling structure, which uniformly takes away the heat generated by the rotor, so that the temperature rise of each part of the motor is maintained within the range of standard specifications. The utility model has the advantages of compact and simple generator structure, light weight, few parts, reliable work, convenient maintenance, improved cooling efficiency, reduced maintenance cost, prolonged motor life and met special requirements of air platform.

[0021] 2. The "Z" type oil channel cooling structure of the utility model includes a plurality of axial oil channels and inclined oil channels inside the rotor, and utilizes the hollow shaft hole as the main oil inlet channel, which not only reduces the weight of the rotor, but also uniformly cools the rotor; in addition, an annular groove is arranged at the intersection of the axial oil channel and the inclined oil channel, the cooling oil of the inclined oil channel passes through the annular groove and then enters the axial oil channel, which reduces the flow resistance at the intersection of the inclined oil channel and the axial oil channel, and the annular groove structure is also beneficial to the cooling of the end surface of the rotor, so that the entire rotor is uniformly cooled and the cooling efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the gas turbine generator of the utility model;

[0023] Figure 2 is the rotor unit cooling oil supply schematic diagram of the motor of the utility model;

[0024] Figure 3 is the stator structure diagram of the motor of the utility model;

[0025] Figure 4 is the stator unit spiral water channel water flow direction schematic diagram;

[0026] Figure 5 is the stator unit spiral water channel structure diagram;

[0027] Figure 6 is the inlet and outlet water port schematic diagram of the stator unit water cooling structure;

[0028] Figure 7 is the rotor structure diagram of the utility model;

[0029] Figure 8 is the flow direction schematic diagram of the cooling oil inside the rotor;

[0030] Figure 9 is the front half shaft 3 / 4 sectional view of the rotor;

[0031] Figure 10is a structure diagram of the rear half shaft of the rotor;

[0032] The figure marks are: 1-gas turbine input shaft; 2-first blocking ring; 3-labyrinth seal; 4-screw; 5-front pressing plate; 6-front end cover; 7-sealing ring; 8-front bearing; 9-stator unit; 10-rotor unit; 11-rear bearing; 12-rear end cover; 16-rear bearing pressing plate; 17-rear cover plate; 20-rear sealing seat; 30-oil outlet; 31-annular groove; 32-oil inlet; 33-oblique oil channel; 34-axial oil channel; 35-hollow shaft hole; 92-water jacket; 93-casing; 94-stator core; 95-stator coil; 97-water inlet; 98-water outlet; 101-rotor front half shaft; 102-second blocking ring; 103-magnetic steel; 104-rotor rear half shaft. DETAILED DESCRIPTION

[0033] As Figure 1 shown, the utility model discloses a generator for gas turbine, and the generator for gas turbine includes stator unit 9 and rotor unit 10 and first blocking ring 2, labyrinth seal 3, front pressing plate 5, front end cover 6, front bearing 8, rear bearing 11, rear end cover 12, rear pressing plate 16, rear cover plate 17, rear sealing seat 20 and a plurality of screws 4 and a plurality of sealing rings 7.

[0034] Front end cover 6 and rear end cover 12 are arranged on the both sides of stator unit 9 respectively, and stator unit 9 is fixed with front end cover 6 and rear end cover 12 through screw 4.Sealing ring 7 is arranged between stator unit 9 and front end cover 6 and rear end cover 12 respectively, and is used for the static sealing of stator unit 9 and front end cover 6 and rear end cover 12;Front end cover 6 and rear end cover 12 are arranged with front bearing chamber and rear bearing chamber respectively, rotor unit 10 is installed with front bearing and rear bearing and passes through front end cover 6 bearing seat and rear end cover 12 bearing seat, when stator coil is connected with alternating current, under the action of magnetic field, rotor unit 10 rotates, and front bearing 8 and rear bearing 11 follow the rotation. Wherein, front bearing 8 and rear bearing 11 are all lubricated by lubricating grease.

[0035] As Figures 2 to 6 shown, stator unit 9 includes sealing ring 7, water jacket 92, stator core 94 and stator coil 95; Wherein, stator coil 95 is wound on stator core 94, stator core 94 is fixed on the inner ring of casing 93, the outer ring of casing 93 is arranged with spiral water groove, and sealing ring 7 is arranged on the both sides of spiral water groove respectively; Water jacket 92 is arranged with one water inlet 97 and one water outlet 98, water jacket 92 is sleeved on the outer ring of casing 93, and the outer ring of casing 93 and water jacket 92 are sealed to form spiral water cooling closed cavity by sealing ring 7, circulating water enters from the water inlet 97 of water jacket 92, flows out from the water outlet 98 through spiral water groove, and removes the heat generated by stator coil 95 heating, so that the temperature rise of stator unit 9 is kept within the standard range.

[0036] AsFigure 2 and Figures 7 to 10 As shown in the figure, the rotor unit 10 is composed of a rotor front half shaft 101, a second blocking ring 102, a magnetic steel 103, and a rotor rear half shaft 104. The second blocking ring 102 is sleeved on the outer circle of the rotor front half shaft 101, the magnetic steel 103 is fixed on the outer circle of the rotor front half shaft 101 in a sticker manner, and the rotor rear half shaft 104 is respectively sleeved on the outer circles of the magnetic steel 103 and the rotor front half shaft 101.

[0037] The rotor unit 10 is provided with a “Z” type oil channel, which specifically includes n axial oil channels 34 arranged inside the rotor and corresponding inclined oil channels 33. The n axial oil channels 34 are parallel to the rotor axis direction and are symmetrically arranged inside the rotor with the rotor axis as the center of symmetry. The inclined oil channels 33 pass through the axial oil channels 34 and the rotor hollow shaft hole 35. The rear cover plate 17 of the motor is provided with an oil outlet 30 and an oil inlet 32, and the oil inlet 32 is opposite to the position of the rotor hollow shaft hole 35. The axial oil channels 34 and the inclined oil channels 33 are arranged inside the rotor front half shaft 101. The oil inlet port of the inclined oil channel 33 is arranged at the tail end of the axial oil channel 34, and the oil outlet port is arranged at the front end of the rotor hollow shaft hole 35. When the cooling oil flows into the rotor unit 10 through the hollow shaft hole 35 from the oil inlet 32, it flows out to the gap near the front end cover 6 through the n inclined oil channels 33 and the axial oil channels 34, and then flows out through the oil outlet 30, thereby completing the cooling of the rotor unit 10. This “Z” type oil channel cooling structure uses the hollow shaft hole as the main oil inlet channel, which not only reduces the weight of the rotor, but also makes the heat dissipation of the rotor uniform. Wherein n = 6-12.

[0038] Further, the intersection of the oil outlet port of the inclined oil channel 33 and the oil inlet port of the axial oil channel 34 is provided with an annular groove 31 arranged on the end face of the rotor rear half shaft 104. The annular groove 31 functions to make the cooling oil of the inclined oil channel pass through the annular groove and then enter the axial oil channel, thereby reducing the flow resistance at the intersection of the inclined oil channel and the axial oil channel. At the same time, the annular groove structure also facilitates the cooling of the end face of the rotor, so that the entire rotor is uniformly cooled, thereby improving the cooling efficiency.

[0039] The rotor unit 10 is internally provided with a hollow shaft hole 35, and an inner spline hole is arranged at the front end. The outer spline of the gas turbine input shaft 1 is in static connection with the inner spline of the rotor unit 10. The motor includes a motor mode and a generator mode. The motor mode is the starting stage of the gas turbine, and the motor provides power for the starting of the gas turbine. In the generator mode, the gas turbine transmits torque to the generator, so that the generator generates electric power. Figure 1 and Figure 2The hollow shaft hole 35 is sealed by the front end tight fit input shaft 1, and even if there is a small amount of leakage, it does not affect normal use. The hollow shaft hole 35 can also be made into a front end blind hole structure, and the blind hole is blocked at the front end of the intersection of the inclined oil channel 33 and the hollow shaft hole 35. This design is a conventional means in the art, and will not be described here.

[0040] Figure 1 And Figure 4 The front bearing 8 is sealed as follows: the front end cover 6 is provided with a sealing groove on the side close to the bearing, and forms a non-contact labyrinth seal with the outer circle of the rotor unit 10; the other side is provided with a non-contact labyrinth seal 3, the static ring of the front bearing 8 and the labyrinth seal 3 are sequentially installed in the front bearing seat of the front end cover 6, and are positioned by the front pressing plate 4 and fixed by the screw 4; the dynamic ring of the labyrinth seal 3 is installed on the outer circle of the front half shaft 101 of the rotor unit 10, and the first retainer 2 is used to position the labyrinth seal 3 and limit the axial displacement of the labyrinth seal 3.

[0041] The rear bearing 11 is sealed as follows: the rear end cover 12 is provided with a sealing groove on the side close to the rotor unit 10, and forms a non-contact labyrinth seal with the gap fit of the rear half shaft 104 of the rotor unit 10; the other end is provided with two sealing grooves, which are as follows: a sealing groove is arranged in the hole of the rear half shaft 104 of the rotor unit 10, the sealing seat 20 is installed on the rear pressing plate 16 and is fastened by the screw 4, and the outer circle thereof is gap fit with the rear half shaft 104 of the rotor unit 10 to form the first non-contact labyrinth seal. The rear pressing plate 16 is used for axial positioning of the rear bearing 11, and is fastened by the screw 4. A sealing groove is arranged on the rear pressing plate 16, and the outer circle of the rear half shaft 104 of the rotor unit 10 is combined to form the second non-contact labyrinth seal; the rear cover plate 17 is arranged on the rear part of the rear end cover 12, and the two are connected by the screw 4. The rear cover plate is provided with a sealing ring 7 between the rear end cover and the rear sealing seat.

[0042] The motor of the utility model adopts the cooling mode of water cooling and oil cooling, wherein the stator unit adopts the spiral water channel water cooling structure, the high specific heat capacity and good heat conduction performance of the cooling medium water uniformly radiate the motor stator heat; the rotor unit adopts the "Z" type oil channel cooling structure, uniformly takes away the heat generated by the rotor, maximizes the potential performance of the motor, improves the output power of the motor under the unit weight and volume, makes the motor structure compact and simple, and meets the special requirements of the air platform.

Claims

1. An electric machine cooling unit, said electric machine comprising a machine housing (93), a stator unit (9) and a rotor unit (10) of a hollow shaft construction, the stator core (94) of the stator unit (9) being fixed to the inner circumference of the machine housing (93), characterized in that: The motor cooling unit comprises a stator cooling unit and a rotor cooling unit. The stator cooling unit comprises a spiral water groove arranged outside the casing (93) and a water jacket (92) sleeved outside the casing (93), a sealing ring (7) is arranged between the two sides of the spiral water groove and the casing (93), so that a spiral water cooling closed cavity is formed between the casing (93) and the water jacket (92), the water jacket (92) is provided with a water inlet (97) and a water outlet (98), circulating water enters the water jacket (92) from the water inlet (97) and flows out from the water outlet (98) through the spiral water groove. The rotor cooling unit comprises n axial oil channels (34) arranged inside the rotor and corresponding inclined oil channels (33), the n axial oil channels (34) are parallel to the rotor axis direction and are symmetrically arranged inside the rotor with the rotor axis as the center, the inclined oil channels (33) penetrate the axial oil channels (34) and the rotor hollow shaft hole (35), the rear cover plate (17) of the motor is provided with an oil outlet (30) and an oil inlet (32), and the oil inlet (32) is opposite to the position of the rotor hollow shaft hole (35).

2. An electric machine cooling unit according to claim 1, characterized in that: The oil inlet port of the inclined oil channel (33) is arranged at the tail end of the axial oil channel (34), and the oil outlet port is arranged at the front end of the rotor hollow shaft hole (35).

3. A motor cooling unit according to claim 1 or 2, characterised in that: An annular groove (31) is arranged at the intersection of the oil outlet port of the inclined oil channel (33) and the oil inlet port of the axial oil channel (34).

4. A motor cooling unit according to claim 3, characterised in that: The rotor unit comprises a rotor front half shaft (101), a magnetic steel (103) and a rotor rear half shaft (104), the magnetic steel (103) is arranged outside the rotor front half shaft (101), and the rotor rear half shaft (104) is sleeved outside the magnetic steel (103) and the rotor front half shaft (101).

5. A motor cooling unit according to claim 4, characterised in that: The annular groove (31) is arranged on the end face of the rotor rear half shaft (104).

6. A motor cooling unit according to claim 4, characterised in that: The axial oil channel (34) and the inclined oil channel (33) are arranged inside the rotor front half shaft (101).

7. A motor cooling unit according to claim 1, characterized in that: n＝6-12。 8. A motor cooling unit according to claim 1, characterized in that: The front end of the casing (93) is provided with a front end cover (6), the outer circle of the front end cover (6) is sealed with the stator unit (9) by a sealing ring (7), and a non-contact labyrinth sealing unit is arranged between the inner circle of the front end cover (6) and the rotor unit (10).

9. A motor cooling unit according to claim 1, characterized in that: The rear end of the casing (93) is provided with a rear end cover (12), the outer circle of the rear end cover (12) is sealed with the stator unit (9) by a sealing ring (7), and a non-contact labyrinth sealing unit is arranged between the inner circle of the rear end cover (12) and the rotor unit (10).

10. A gas turbine generator comprising a gas turbine and an electric machine, characterized in that The motor comprises the motor cooling unit according to any one of claims 1 to 9.

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