Wide-load high-flow power generation device of thermal power generating unit

Abstract

The invention relates to the technical field of power generation devices, in particular to a wide-load large-flow power generation device of a thermal power generating unit, which comprises a base, a power generator, a middle shaft, a steam turbine, an electromagnetic ring, an electromagnetic shaft and a heat insulation back plate, the two ends of the center shaft are connected with an output shaft of the generator and an output shaft of the steam turbine respectively, the electromagnetic rings are symmetrically installed at the two ends of the base, the center shaft is located between the two electromagnetic rings, the center shaft and the electromagnetic rings are coaxial, and the electromagnetic shafts are fixedly installed at the ends of the center shaft. The two ends of the middle shaft between the generator and the turbine are respectively provided with a group of electromagnetic rings and electromagnetic shafts to form a magnetic suspension effect, coils are used for generating magnetic fields on the peripheries of the electromagnetic rings, the electromagnetic shafts are fixed on the middle shaft, the coils are used for generating the magnetic fields, and homopolar repulsion of the magnetic fields is used for floating the middle shaft, so that direct contact between the middle shaft and a bearing bush is avoided; friction between the shaft and the bearing bush is reduced, and generating efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power generation devices, in particular to a wide-load and large-flow power generation device for a thermal power unit. Background Art

[0002] With the acceleration of industrialization and urbanization, the demand for electricity continues to rise, especially during peak hours, when the grid load fluctuates significantly. Traditional coal-fired, gas-fired and other power generation devices have low efficiency and high emissions when operating at low loads, and are difficult to adapt to frequent load changes. As a result, wide-load and large-flow power generation devices have come into being.

[0003] A power generation device is a mechanical device that converts mechanical energy into electrical energy. It is driven by a water turbine, steam turbine, diesel engine or other power machinery, and converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator, which then converts it into electrical energy. A steam turbine generator is a generator driven by a steam turbine. The superheated steam generated by the boiler enters the steam turbine and expands to do work, causing the blades to rotate and drive the generator to generate electricity. The waste steam after doing work is sent back to the boiler for recycling through the condenser, circulating water pump, condensate pump, feed water heating device, etc.

[0004] The existing steam turbine generator is a complex structure, involving various process requirements. Among them, the steam turbine generator bearing is the key and difficult point of each steam turbine generator maintenance. The entire steam turbine generator intermediate shaft is divided into two sections, which are connected as a whole by a backrest wheel, and the connection deviation shall not be greater than 3 wires. Since the steam turbine generator set is operating at high speed and under high temperature and high pressure, the entire weight of the rotating shaft of the traditional steam turbine generator set is supported by the bearing. During operation, the friction is large, which reduces the overall power generation efficiency. In addition, the bearing generates heat due to its own friction during operation, and the bearing failure rate is high, which is not conducive to the long-term and stable operation of the entire generator set. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the present invention provides a wide-load and large-flow power generation device for a thermal power unit, thereby solving the problem of low conversion efficiency of a traditional steam turbine generator unit.

[0006] The technical solution adopted by the present invention to solve its technical problems is a wide-load and large-flow power generation device of a thermal power unit, including a base, a generator, a central shaft, a steam turbine, an electromagnetic ring, an electromagnetic shaft and an insulating back plate. The central shaft is rotatably installed on the base, the generator and the steam turbine are respectively installed at two ends of the base, and the two ends of the central shaft are respectively connected to the generator output shaft and the steam turbine output shaft.

[0007] The electromagnetic rings are symmetrically installed at two ends of the base, the central axis is located between the two electromagnetic rings, and the central axis is coaxial with the electromagnetic rings.

[0008] The electromagnetic shaft is fixedly installed at the end of the central shaft, and the electromagnetic shaft passes through the electromagnetic ring and the two are matched with each other by magnetic force.

[0009] The heat-insulating back plate is movably mounted on one end of the central shaft facing the steam turbine, a protective shell is fixedly mounted on the upper part of the base, the central shaft, the generator and the electromagnetic ring are all located inside the protective shell, and the heat-insulating back plate is located at the end opening of the protective shell.

[0010] Preferably, multiple groups of electromagnets with matching magnetic forces are circumferentially installed on the inner side of the electromagnetic shaft and the inner ring surface of the electromagnetic ring. The electromagnetic coil in the electromagnetic shaft is energized through a carbon brush slip ring, and the outer ring surface of the electromagnetic shaft is crisscrossed with multiple heat dissipation grooves.

[0011] Preferably, the side of the thermal insulation back plate away from the turbine is slidably inserted into the outer ring surface of the electromagnetic ring through an arrangement rod, and a circular hole groove slidingly matched with the outer wall of the central axis is provided in the middle of the thermal insulation back plate, and the outer contour circumference of the thermal insulation back plate is greater than the outer contour circumference of the electromagnetic ring.

[0012] Preferably, a temperature measuring hole is opened on one side of the middle of the electromagnetic ring, a temperature sensor is installed in the temperature measuring hole, and a spare cooling hole groove is arranged on the other side of the middle of the electromagnetic ring, and the outside of the cooling hole groove leads to the heat dissipation groove on the surface of the electromagnetic shaft.

[0013] Preferably, two groups of docking grooves are symmetrically provided at the end of the turbine output shaft and the end of the central axis opposite thereto, and a plurality of docking rods are installed between the two groups of docking grooves. The plurality of docking rods are circumferentially distributed in an inclined posture, and the adjacent spacing of the docking rods close to the turbine side is smaller than the adjacent spacing close to the central axis side.

[0014] Preferably, an air supply groove is opened in the middle part of the docking rod, an air supply ring is fixedly installed on one side close to the thermal insulation back plate, an air supply plate is hingedly installed on the outer ring surface of the air supply ring, a torsion spring is connected between the hinged end of the air supply plate and the air supply ring, the movable end of the air supply plate is designed to be open, and the inner cavity of the air supply plate is connected to the air supply groove, a permanent magnet is fixedly installed on the outer side of the movable end of the air supply plate, a permanent magnet ring is fixedly installed on the middle and lower part of the thermal insulation back plate, and the permanent magnet ring is magnetically matched with the permanent magnet.

[0015] Preferably, the docking rod is installed between the central shaft and the steam turbine with its two ends parallel and its middle part inclined. Negative pressure holes are evenly opened at one end of the middle part of the docking rod close to the steam turbine, and the axial direction of the negative pressure holes is inclined to point to the axis of the turbine output shaft.

[0016] Preferably, a heat dissipation bin is fixedly installed on the outer wall of the steam turbine, the end of the steam turbine output shaft is located inside the heat dissipation bin, a aligning shaft is fixedly connected between the end of the steam turbine output shaft and the end of the center shaft, a heat conduction groove is circumferentially opened at the end of the steam turbine output shaft, the heat conduction groove is circumferentially arranged around the aligning shaft, and heat conduction rods are evenly inserted in the heat conduction grooves, a heat dissipation fan is fixedly installed on one end of the aligning shaft close to the steam turbine, and the heat dissipation fan is located at the outlet of the heat dissipation bin.

[0017] Preferably, one end of the docking rod that is attached to the turbine output shaft is evenly provided with through holes connected to the inner cavity of the heat exhaust bin, and the through holes are located on the rear side of the heat exhaust fan, and the outer wall of the positive shaft is evenly installed with cooling rods, which are conically arranged around the front side of the heat exhaust fan.

[0018] Preferably, a grating ring is fixedly installed on one end of the central axis close to the generator, a light source emitter matching the grating ring is fixedly installed on the base, a brake pad is fixedly installed on the outer wall of the central axis adjacent to the grating ring, a brake caliper is fixedly installed on the base, and an oil pump seat matching the brake caliper is fixedly installed on the base.

[0019] Beneficial effects of the present invention:

[0020] (1) The present invention installs a group of electromagnetic rings and electromagnetic shafts at both ends of the central axis between the generator and the steam turbine to form a magnetic levitation effect. The electromagnetic ring uses a coil to generate a magnetic field on the periphery. The electromagnetic shaft is fixed on the central axis and also uses a coil to generate a magnetic field. The central axis is floated by using the principle of magnetic field repulsion of like poles to avoid direct contact between the central axis and the bearing. While reducing the degree of friction, the degree of intervention of the lubricating oil system is reduced, and the space occupied is reduced. The temperature value of the magnetic levitation area is measured in real time by a temperature sensor. When the temperature is higher than a predetermined value range, the existing air cooling component is used to pass cooling airflow into the cooling hole groove to achieve dual cooling of the electromagnetic shaft and the electromagnetic ring. The heat dissipation grooves arranged in a criss-cross pattern not only enhance the heat dissipation capacity of the electromagnetic shaft itself, but also facilitate the fluidity of the airflow in the later passive heat dissipation process, further improve the heat dissipation performance, and improve the stability of magnetic levitation.

[0021] (2) The present invention disperses the connecting parts between the central shaft and the output end of the steam turbine into a plurality of docking rods arranged circumferentially, thereby dispersing the heat from the output shaft of the steam turbine. During the continuous rotation of the central shaft, the plurality of docking rods are used to perform intermittent air intake and exhaust processes in sequence, thereby reducing the heat transfer rate and transfer area from the direction of the steam turbine. At the same time, the intermittent cooling method is used to avoid the formation of a stable negative pressure environment in the rotation path area of ​​the air supply ring, thereby avoiding the negative impact of heat accumulation.

[0022] (3) The heat-insulating back plate of the present invention is made of a material that is a poor thermal conductor. The heat-insulating back plate is placed between the steam turbine and the electromagnetic ring. Together with the use of a protective shell, a heat-insulating barrier can be formed, thereby reducing the negative impact of external environmental heat on the magnetic suspension area or the generator, and improving the operating stability of the entire unit. By converting the heat dissipation method from a single-direction shaft-to-shaft type to an shaft-to-air type, the heat dissipation space and heat dissipation channel of the hot air flow are further expanded, reducing the interference amplitude caused by heat fluctuations in the magnetic suspension area, and improving the operating stability of the entire unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the overall connection structure of the present invention; Figure 2 It is a schematic diagram of the positional relationship between the generator, the central shaft and the steam turbine of the present invention; Figure 3 It is a schematic diagram of the positional relationship between the generator and the grating ring of the present invention; Figure 4 for Figure 3 The enlarged schematic diagram at A in the middle; Figure 5 It is a schematic diagram of the positional relationship between the shaft and the steam turbine in the present invention; Figure 6 It is a schematic diagram of the positional relationship between the electromagnetic ring and the heat-insulating back plate of the present invention; Figure 7 for Figure 6 The enlarged schematic diagram of point B in FIG. Figure 8 It is a schematic diagram of the positional relationship between the heat-insulating back plate and the docking rod of the present invention; Fig. 9 for Figure 8 The enlarged schematic diagram of point C in FIG. Fig.10 It is a schematic diagram of the positional relationship between the aligning axis and the docking axis of the present invention; Fig.11 for Fig.10 The enlarged schematic diagram of point D in FIG.

[0025] In the figure: 1. Base; 2. Generator; 3. Central axis; 4. Steam turbine; 5. Electromagnetic ring; 6. Electromagnetic shaft; 7. Insulation back plate; 11. Protective shell; 8. Electromagnet; 61. Heat sink; 71. Arrangement rod; 51. Temperature measuring hole; 52. Cooling hole slot; 41. Docking rod; 72. Air supply ring; 721. Air supply sheet; 722. Permanent magnet; 73. Permanent magnet ring; 411. Negative pressure hole; 42. Heat exhaust bin; 43. Positive axis; 44. Heat conducting rod; 45. Heat exhaust fan; 431. Heat dissipation rod; 31. Grating ring; 12. Light source transmitter; 32. Brake pad; 13. Brake caliper; 14. Oil pump seat. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] The embodiment of the present invention solves the problem that the friction pressure between the bearing and the bearing bush connected by the bearing during the power generation process of the steam turbine generator set is large, which affects the power generation efficiency by providing a wide load and large flow power generation device of the thermal power set.

[0028] The existing steam turbine generator is a complex structure, involving various process requirements. Among them, the steam turbine generator bearing is the key and difficult point of each steam turbine generator overhaul. The entire steam turbine generator intermediate shaft is divided into two sections, which are connected as a whole by the backrest wheel, and the connection deviation shall not be greater than 3 wires. Since the steam turbine generator set is operating at high speed and under high temperature and high pressure, and the traditional generator shaft and bearing are connected by bearings, during operation, the friction is large, which makes the overall power generation efficiency low, and the bearing generates heat during operation, which makes it difficult for the lubricating oil to effectively enter the gap between the bearing rollers for lubrication and heat removal. The bearing failure rate is high, which is not conducive to the long-term stable operation of the entire generator set. Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention proposes a wide-load and large-flow power generation device for a thermal power unit, including a base 1, a generator 2, a central shaft 3, a steam turbine 4, an electromagnetic ring 5, an electromagnetic shaft 6 and a heat-insulating back plate 7. The central shaft 3 is rotatably mounted on the base 1, the generator 2 and the steam turbine 4 are respectively mounted at two ends of the base 1, and the two ends of the central shaft 3 are respectively connected to the output shaft of the generator 2 and the output shaft of the steam turbine 4. The present invention installs a group of electromagnetic rings 5 ​​and an electromagnetic shaft 6 at both ends of the central shaft 3 between the generator 2 and the steam turbine 4 to form a magnetic levitation effect. The electromagnetic ring 5 uses a coil on the periphery to generate a magnetic field. The electromagnetic shaft 6 is fixed on the central shaft 3. The coil is also used to generate a magnetic field. The central shaft 3 is floated by using the principle of magnetic field like poles repelling each other, thereby avoiding direct contact between the central shaft 3 and the bearing. While reducing the degree of friction, the degree of intervention of the lubricating oil system is reduced, and the space occupancy is reduced.

[0029] Furthermore, since the steam turbine generator set is operating at high speed and at high temperature and pressure, it is necessary to prevent the unit from experiencing dangerous centrifugal force, thermal stress and thermal deformation, and ensure that the safety protection device or system can be activated in time and shut down quickly in case of emergency, so as to avoid accidents such as equipment damage. Figure 3 and Figure 4As shown, the electromagnetic rings 5 ​​are symmetrically installed at both ends of the base 1, the central axis 3 is located between the two electromagnetic rings 5, and the central axis 3 is coaxial with the electromagnetic rings 5, the electromagnetic shaft 6 is fixedly installed at the end of the central axis 3, the electromagnetic shaft 6 penetrates the electromagnetic rings 5 ​​and the two are magnetically matched, a grating ring 31 is fixedly installed at one end of the central axis 3 close to the generator 2, a light source transmitter 12 matched with the grating ring 31 is fixedly installed on the base 1, a brake pad 32 is fixedly installed on the outer wall of the central axis 3 adjacent to the grating ring 31, and the base 1 A brake caliper 13 is fixedly installed, and an oil pump seat 14 matched with the brake caliper 13 is fixedly installed on the base 1. During the operation of the middle shaft 3, it drives the grating ring 31 to rotate synchronously. At this time, the rotation speed of the middle shaft 3 can be monitored in real time through the change of the shading amount of the light source transmitter 12 in the grating ring 31. When a stall or emergency occurs, the oil pump seat 14 system intervenes to make the brake caliper 13 hold the brake pad 32 tightly, thereby completing the deceleration and stop of the middle shaft 3, and further realizing the shutdown of the generator 2.

[0030] Furthermore, the electromagnetic shaft 6 and the electromagnetic ring 5 are connected to each other by magnetic force, so that the central shaft 3 is in a suspended state. In order to avoid the increase of external heat radiation causing the magnetic suspension effect to weaken or fluctuate, as shown in FIG. Figure 5 and Figure 7 As shown, the inner side of the electromagnetic shaft 6 and the inner ring surface of the electromagnetic ring 5 are circumferentially installed with multiple groups of electromagnets 8 with matched magnetic forces. The electromagnetic coil located in the electromagnetic shaft 6 is energized through a carbon brush slip ring. The outer ring surface of the electromagnetic shaft 6 is provided with multiple heat dissipation grooves 61 in a criss-cross pattern. A temperature measuring hole 51 is provided on one side of the middle of the electromagnetic ring 5, and a temperature sensor is installed in the temperature measuring hole 51. A spare cooling hole groove 52 is provided on the other side of the middle of the electromagnetic ring 5, and the outside of the cooling hole groove 52 leads to the heat dissipation groove 61 on the surface of the electromagnetic shaft 6. The temperature value of the magnetic suspension area is measured in real time by the temperature sensor. When the temperature is higher than the predetermined value range, the existing air cooling component is used to pass the cooling airflow into the cooling hole groove 52 to achieve double cooling of the electromagnetic shaft 6 and the electromagnetic ring 5. The criss-crossed heat dissipation grooves 61 not only enhance the heat dissipation capacity of the electromagnetic shaft 6 itself, but also facilitate the airflow fluidity in the later passive heat dissipation process, further improve the heat dissipation performance, and improve the magnetic suspension stability.

[0031] Furthermore, while reducing the heat conduction of the central shaft 3 itself, it is also necessary to effectively block the hot air flow or heat radiation from the direction of the steam turbine 4. For this purpose, Figure 1 , Figure 8 and Fig. 9As shown, the heat-insulating back plate 7 is movably installed at one end of the central axis 3 facing the steam turbine 4, a protective shell 11 is fixedly installed on the upper part of the base 1, the central axis 3, the generator 2 and the electromagnetic ring 5 are all located on the inner side of the protective shell 11, and the heat-insulating back plate 7 is located at the end opening position of the protective shell 11. The side of the heat-insulating back plate 7 away from the steam turbine 4 is slidably inserted into the outer ring surface of the electromagnetic ring 5 through the arrangement rod 71, and a circular hole groove that slides with the outer wall of the central axis 3 is provided in the middle of the heat-insulating back plate 7. The outer contour circumference of the heat-insulating back plate 7 is greater than the outer contour circumference of the electromagnetic ring 5. The heat-insulating back plate 7 is made of a poor thermal conductor material, so that the heat-insulating back plate 7 is between the steam turbine 4 and the electromagnetic ring 5. With the use of the protective shell 11, a heat-insulating barrier can be formed, thereby reducing the negative impact of external environmental heat on the magnetic suspension area or the generator 2, and improving the operating stability of the entire unit.

[0032] Furthermore, since the steam turbine 4 is driven by high-temperature and high-pressure steam, its working environment and temperature will have a negative impact on the magnetic levitation effect. In order to effectively dissipate and isolate the heat from the steam turbine 4, Figures 8 to 10 As shown, two groups of docking grooves are symmetrically provided at the end of the output shaft of the steam turbine 4 and the end of the central axis 3 opposite thereto, and a plurality of docking rods 41 are installed between the two groups of docking grooves. The plurality of docking rods 41 are circumferentially distributed in an inclined posture, and the adjacent spacing of the docking rods 41 on the side close to the steam turbine 4 is smaller than the adjacent spacing on the side close to the central axis 3. An air supply groove is provided in the middle of the docking rod 41, and an air supply ring 72 is fixedly installed on the side close to the thermal insulation back plate 7. An air supply piece 721 is hingedly installed on the outer ring surface of the air supply ring 72, and a torsion spring is connected between the hinged end of the air supply piece 721 and the air supply ring 72. The movable end of the air supply piece 721 is designed to be open, and the inner cavity of the air supply piece 721 is connected to the air supply groove, and a permanent magnet 722 is fixedly installed on the outer side of the movable end of the air supply piece 721, and a permanent magnet ring 73 is fixedly installed on the middle and lower part of the thermal insulation back plate 7, and the permanent magnet ring 73 and the permanent magnet 722 are magnetically matched.

[0033] By dispersing the connecting parts between the central shaft 3 and the output end of the steam turbine 4 into a plurality of docking rods 41 arranged circumferentially, the heat from the output shaft of the steam turbine 4 can be dispersed instead of concentrated, and the docking rods 41 can be installed in an inclined posture, which can further improve the spatial distribution level of heat in the process of heat transfer from the surface of the docking rods 41. The circumferential rotation of the docking rods 41 can dissipate the heat to the outside during the air flow, thereby increasing the cooling rate of the docking rods 41. When the docking rods 41 rotate, they drive the air supply ring 72 and the air supply sheet 721 to rotate synchronously. When the air supply sheet 721 moves to the middle and lower position of the heat insulation back plate 7, it is subjected to the gravity and the magnetic force between the permanent magnet ring 73 and the permanent magnet 722, so that the air supply sheet 721 gradually overcomes the torsion of the torsion spring. The force acts and tilts toward the outside of the air supply ring 72. At this time, the inner cavity of the air supply piece 721 is opened, allowing the airflow on its forward path to rush in and finally enter the air supply groove on the inner side of the docking rod 41, thereby realizing internal cooling of the docking rod 41 and further improving the cooling rate of the docking rod 41. When the air supply ring 72 moves out of the permanent magnet ring 73 area, the air supply piece 721 is folded again. At this time, the gas flow channel is closed, and this process is repeated. During the continuous rotation of the central axis 3, multiple docking rods 41 perform intermittent air intake and exhaust processes in turn, thereby reducing the heat transfer rate and transfer area from the direction of the turbine 4. At the same time, through the intermittent cooling method, the formation of a stable negative pressure environment in the rotation path area of ​​the air supply ring 72 is avoided, thereby causing the negative impact of heat accumulation.

[0034] Furthermore, in order to further improve the heat dissipation performance of the docking rod 41, as Figure 8 , Fig.10 and Fig.11 As shown, the docking rod 41 is installed between the central axis 3 and the steam turbine 4 with two parallel ends and a tilted middle portion. Negative pressure holes 411 are evenly provided at one end of the middle portion of the docking rod 4 close to the steam turbine 4, and the axial direction of the negative pressure hole 411 is tilted toward the axis of the output shaft of the steam turbine 4. When gas flow is formed in the air supply groove inside the docking rod 41, the inner pressure is reduced, and the external airflow is attracted through the negative pressure hole 411. Since the negative pressure hole 411 is tilted, the incoming cold airflow immediately flows toward the direction of the steam turbine 4, thereby slowing down the diffusion of heat from the position of the steam turbine 4 and reducing the heating rate of the docking rod 41.

[0035] Furthermore, while isolating the steam turbine 4 from outputting heat to the magnetic suspension area and the central axis 3, it is also necessary to actively dissipate the overflow heat in the direction of the steam turbine 4 in order to effectively curb the rapid accumulation and transfer of heat. Figure 6 , Fig.10 and Fig.11As shown, a heat exhaust bin 42 is fixedly installed on the outer wall of the steam turbine 4, the end of the output shaft of the steam turbine 4 is located inside the heat exhaust bin 42, a aligning shaft 43 is fixedly connected between the end of the output shaft of the steam turbine 4 and the end of the middle shaft 3, a heat conduction groove is circumferentially provided at the end of the output shaft of the steam turbine 4, the heat conduction groove is circumferentially arranged around the aligning shaft 43, and heat conduction rods 44 are evenly inserted in the heat conduction grooves, a heat exhaust fan 45 is fixedly installed at one end of the aligning shaft 4 close to the steam turbine 4, the heat exhaust fan 45 is located at the outlet position of the heat exhaust bin 42, a through hole connected to the inner cavity of the heat exhaust bin 42 is evenly provided at one end of the docking rod 41 that fits the output shaft of the steam turbine 4, and the through hole is located on the rear side of the heat exhaust fan 45, and a heat dissipation rod 431 is evenly installed on the outer wall of the aligning shaft 43, and the heat dissipation rod 431 is conical The heat conducting rods 44 are arranged around the front side of the heat exhaust fan 45. During the operation of the steam turbine 4, the heat conducting rods 44 arranged circumferentially can concentrate the heat in the front area of ​​the steam turbine 4. Through the rotation of the heat exhaust fan 45, the heat at the position of the heat conducting rods 44 is extracted outward, so that it is separated from the output shaft position of the steam turbine 4. At the same time, when the extracted hot air flow passes through the position of the heat sink 431, it is guided by the inclined posture of the heat sink 431, and the hot air flow is further dissipated to the surrounding space. This process transforms the heat dissipation method from a single-direction axis-to-axis type to an axis-to-air type, further expanding the heat dissipation space and heat dissipation channel of the hot air flow, reducing the interference amplitude caused by heat fluctuations in the magnetic suspension area, and improving the operating stability of the entire unit.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wide-load and large-flow power generation device for a thermal power unit, comprising a base (1), a generator (2), a central shaft (3) and a steam turbine (4), wherein the central shaft (3) is rotatably mounted on the base (1), the generator (2) and the steam turbine (4) are respectively mounted at two ends of the base (1), and the two ends of the central shaft (3) are respectively connected to the output shaft of the generator (2) and the output shaft of the steam turbine (4), characterized in that: Also includes: Electromagnetic rings (5), the electromagnetic rings (5) being symmetrically mounted at two ends of the base (1), the central axis (3) being located between the two electromagnetic rings (5), and the central axis (3) being coaxial with the electromagnetic rings (5); An electromagnetic shaft (6), wherein the electromagnetic shaft (6) is fixedly mounted on the end of the central shaft (3), the electromagnetic shaft (6) passes through the electromagnetic ring (5) and the two are magnetically matched; a heat-insulating back plate (7), the heat-insulating back plate (7) being movably mounted on one end of the central shaft (3) facing the steam turbine (4); a protective shell (11) being fixedly mounted on the upper portion of the base (1); the central shaft (3), the generator (2) and the electromagnetic ring (5) being all located inside the protective shell (11); and the heat-insulating back plate (7) being located at an end opening of the protective shell (11); The inner side of the electromagnetic shaft (6) and the inner ring surface of the electromagnetic ring (5) are circumferentially mounted with a plurality of sets of electromagnets (8) with matching magnetic forces. The electromagnetic coil located in the electromagnetic shaft (6) is energized via a carbon brush slip ring. The outer ring surface of the electromagnetic shaft (6) is provided with a plurality of heat dissipation grooves (61) arranged in a crisscross pattern.

2. A wide load and large flow power generation device for a thermal power unit according to claim 1, characterized in that: The side of the heat-insulating back plate (7) away from the steam turbine (4) is slidably plugged into the outer ring surface of the electromagnetic ring (5) via an arrangement rod (71); a circular hole groove that slidably cooperates with the outer wall of the central shaft (3) is provided in the middle of the heat-insulating back plate (7); and the outer contour circumference of the heat-insulating back plate (7) is greater than the outer contour circumference of the electromagnetic ring (5).

3. A wide load and large flow power generation device for a thermal power unit according to claim 2, characterized in that: A temperature measuring hole (51) is provided on one side of the middle of the electromagnetic ring (5), a temperature sensor is installed in the temperature measuring hole (51), and a spare cooling hole groove (52) is provided on the other side of the middle of the electromagnetic ring (5), and the outside of the cooling hole groove (52) leads to a heat dissipation groove (61) on the surface of the electromagnetic shaft (6).

4. A wide load and large flow power generation device for a thermal power unit according to claim 1, characterized in that: Two groups of docking grooves are symmetrically formed at the end of the steam turbine (4) output shaft and the end of the central shaft (3) opposite thereto, and a plurality of docking rods (41) are installed between the two groups of docking grooves. The plurality of docking rods (41) are circumferentially distributed in an inclined posture, and the adjacent spacing of the docking rods (41) on the side close to the steam turbine (4) is smaller than the adjacent spacing on the side close to the central shaft (3).

5. A wide load and large flow power generation device for a thermal power unit according to claim 4, characterized in that: An air supply groove is provided in the middle of the docking rod (41); an air supply ring (72) is fixedly mounted on one side close to the heat insulating back plate (7); an air supply piece (721) is hingedly mounted on the outer ring surface of the air supply ring (72); a torsion spring is connected between the hinged end of the air supply piece (721) and the air supply ring (72); the movable end of the air supply piece (721) is designed to be open; the inner cavity of the air supply piece (721) is connected to the air supply groove; a permanent magnet (722) is fixedly mounted on the outer side of the movable end of the air supply piece (721); a permanent magnet ring (73) is fixedly mounted on the middle and lower part of the heat insulating back plate (7); and the permanent magnet ring (73) and the permanent magnet (722) are magnetically matched.

6. A wide load and large flow power generation device for a thermal power unit according to claim 5, characterized in that: The docking rod (41) is installed between the central shaft (3) and the steam turbine (4) with its two ends parallel and its middle portion inclined. Negative pressure holes (411) are evenly arranged at one end of the middle portion of the docking rod (41) close to the steam turbine (4), and the axial direction of the negative pressure hole (411) is inclined to point toward the axis of the output shaft of the steam turbine (4).

7. A wide load and large flow power generation device for a thermal power unit according to claim 6, characterized in that: A heat exhaust bin (42) is fixedly mounted on the outer wall of the steam turbine (4); the end of the output shaft of the steam turbine (4) is located inside the heat exhaust bin (42); a positing shaft (43) is fixedly connected between the end of the output shaft of the steam turbine (4) and the end of the center shaft (3); a heat conduction groove is circumferentially provided at the end of the output shaft of the steam turbine (4), and heat conduction rods (44) are evenly inserted into the heat conduction groove; a heat exhaust fan (45) is fixedly mounted on one end of the positing shaft (43) close to the steam turbine (4); and the heat exhaust fan (45) is located at the outlet of the heat exhaust bin (42).

8. A wide load and large flow power generation device for a thermal power unit according to claim 7, characterized in that: One end of the docking rod (41) that is in contact with the output shaft of the steam turbine (4) is evenly provided with through holes that are in communication with the inner cavity of the heat exhaust chamber (42), and the through holes are located at the rear side of the heat exhaust fan (45). The outer wall of the aligning shaft (43) is evenly provided with cooling rods (431), and the cooling rods (431) are arranged in a cone shape around the front side of the heat exhaust fan (45).

9. A wide load and large flow power generation device for a thermal power unit according to claim 1, characterized in that: A grating ring (31) is fixedly mounted on one end of the central shaft (3) close to the generator (2); a light source emitter (12) matched with the grating ring (31) is fixedly mounted on the base (1); a brake pad (32) is fixedly mounted on the outer wall of the central shaft (3) adjacent to the grating ring (31); a brake caliper (13) is fixedly mounted on the base (1); and an oil pump seat (14) matched with the brake caliper (13) is fixedly mounted on the base (1).

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