Hydraulic generator outer circulation bearing lubricating oil heating system

Abstract

The invention discloses a hydro-generator outer circulation bearing lubricating oil heating system, and belongs to the technical field of hydro-generator set bearing lubrication. The problems that in the prior art, rapid temperature rising cannot be achieved, heating is uneven, and dry burning is caused are solved. According to the technical key points, the constant-temperature heating module, the PID controller and the interlocking system are all arranged in the outer circulation unit, and the porous ring pipe structure is arranged in a bearing oil groove; an oil inlet of the oil inlet pipeline extends into the bottom of the bearing oil groove and is connected with a cold oil input ring pipe; an oil outlet of the oil outlet pipeline extends into the bottom of the bearing oil groove and is connected with a hot oil output ring pipe; and the arrangement height of the constant-temperature heating module is lower than the lowest oil level surface of the bearing oil groove. Space in the oil groove is not occupied, maintenance is convenient, the heater achieves oil return sealing of lubricating oil gravity, and oil cut-off and dry burning of the heater are avoided; cold oil in the bearing oil groove is evenly sucked in, hot oil is evenly sprayed out, lubricating oil in the bearing oil groove is evenly heated, and the temperature stratification phenomenon is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bearing lubrication of hydroelectric generating set, in particular to a hydroelectric generator outer circulating bearing lubricating oil heating system. BACKGROUND

[0002] The environmental temperature of high-altitude hydropower stations, hydropower stations located in the north and some hydropower stations with underground powerhouses is very low in winter. When the hydroelectric generating set is started again after a long time of shutdown, the temperature of the lubricating oil in the bearing oil tank is close to the environmental temperature. At low temperature, the viscosity of the lubricating oil increases sharply, and direct start will cause difficulty in forming the lubricating oil film of the unit bearing, insufficient lubrication of the bearing shoe, rapid temperature rise, and even the possibility of burning the shoe. Therefore, the allowable starting condition of the unit in the national standard is that the temperature of the lubricating oil in the oil tank is not lower than 5 DEG C.

[0003] The existing lubricating oil heating method is to use the pit heater placed around the unit to heat the whole unit or temporarily place an electric heater in the oil tank for heating. The method of heating the whole unit to raise the temperature of the lubricating oil in the bearing oil tank has the problems of slow heating speed and low efficiency (usually time-consuming ≥ 8h); the built-in heater occupies the space in the bearing oil tank, and there are many components such as bearing shoes, oil coolers and reinforcing ribs in the oil tank, so it is difficult to find a suitable space to arrange the built-in heater, and the heater maintenance needs to empty the lubricating oil, which is time-consuming and labor-consuming; before the unit starts, the lubricating oil in the bearing oil tank is in a static state, and the fixed heater causes the lubricating oil in the bearing oil tank to be unevenly heated, and local high temperature can cause oxidation or overheating of the lubricating oil; the safety risk of setting high-power electrical equipment around the bearing oil tank of the unit is high, and the heater in the bearing oil tank is easily dry-burned if placed improperly, which can further cause a fire.

[0004] The former has the problems of slow heating speed and low efficiency; the latter has the problems of large space occupation, uneven heating, local high temperature causing oxidation or deterioration of the lubricating oil, and safety risk caused by dry burning of the heater due to improper placement.

[0005] Therefore, it is urgent to provide a hydroelectric generator outer circulating bearing lubricating oil heating system to solve the problems of slow heating speed, uneven heating and dry burning in the prior art. SUMMARY

[0006] In view of the above facts, the present application is designed to solve the problems of slow heating speed, uneven heating and dry burning in the prior art, and further designs a hydroelectric generator outer circulating bearing lubricating oil heating system.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A hydro-generator external circulation bearing lubricating oil heating system, comprising a bearing oil tank, an external circulation unit, a constant temperature heating module, a porous annular pipe structure, a dynamic temperature control system, and an interlocking system;

[0009] The external circulation unit includes an oil inlet pipeline and an oil outlet pipeline;

[0010] The multi-hole annular pipe structure includes a cold oil input annular pipe and a hot oil output annular pipe;

[0011] The dynamic temperature control system includes an inlet temperature sensor, an outlet temperature sensor, and a PID controller;

[0012] The constant temperature heating module, PID controller and interlocking system are all arranged in the external circulation unit, and the porous annular pipe structure is arranged in the bearing oil tank;

[0013] The oil inlet of the oil inlet pipeline extends into the bottom of the bearing oil tank and is connected to the cold oil input ring pipe, and the other end is connected to the constant temperature heating module; the oil outlet of the oil outlet pipeline extends into the bottom of the bearing oil tank and is connected to the hot oil output ring pipe, and the other end is connected to the constant temperature heating module;

[0014] The arrangement height of the constant temperature heating module is lower than the lowest oil level of the bearing oil tank;

[0015] The inlet temperature sensor is arranged on the oil inlet pipeline;

[0016] The outlet temperature sensor is arranged on the outer side wall of the bearing oil groove;

[0017] The PID controller receives a signal from an outlet temperature sensor and transmits the signal to a constant temperature heating module.

[0018] Furthermore: the height difference between the arrangement height of the constant temperature heating module and the lowest oil level of the bearing oil tank is not less than 0.5m, and the horizontal pipe inclination angle of the oil inlet is ≥5°.

[0019] Furthermore: the constant temperature heating module is composed of several groups of heaters, and the upper limit of the operating temperature is set to 80°C;

[0020] The heater is a series PTC ceramic heater with a power density of 8-10W / cm 3 .

[0021] The package thickness d of the heater satisfies:

[0022] d=V rms / 8+1.2;

[0023] Where, d is the package thickness in mm;

[0024] V rms is the effective value of the heater's rated voltage, in kV.

[0025] Further, the cold oil input ring is circumferentially arranged at the bottom of the bearing oil groove, and the oil suction hole is horizontally arranged outward;

[0026] The hot oil output ring is circumferentially arranged at the bottom of the bearing oil groove, and the oil injection hole is arranged upward.

[0027] Further, the oil suction hole has a diameter of 10 mm, the hole spacing is 1.4 times the diameter of the cold oil input ring, and the total opening area is ≥3 times the cross-sectional area of the cold oil input ring;

[0028] The oil injection hole has a diameter of 10 mm, the hole spacing is 1.4 times the diameter of the hot oil output ring, and the total opening area is ≥3 times the cross-sectional area of the hot oil output ring;

[0029] The oil suction hole and the oil injection hole are staggered on the circumference and have equal numbers.

[0030] Further, the inlet temperature sensor has a model of PT100 and an accuracy of ±0.1℃;

[0031] The outlet temperature sensor has a model of PT100.

[0032] Further, the oil inlet is connected to the cold oil input ring through the flange connection structure, and the oil outlet is connected to the hot oil output ring through the flange connection structure.

[0033] Further, the interlocking system includes a contactor, an oil pump motor main circuit, and a power supply circuit;

[0034] The power supply circuit is arranged at the lower left corner of the interlocking mechanism, the oil pump motor main circuit is arranged at the lower right corner of the interlocking mechanism, the oil pump motor main circuit is connected to the oil pump, the oil pump control unit is arranged at the upper right corner of the interlocking mechanism, the oil pump control unit transmits signals to the oil pump, and the contactor is between the oil pump motor main circuit and the power supply circuit.

[0035] The interlocking system adopts a mechanical interlocking structure, the contactor synchronously controls the power supply circuit of the oil pump motor main circuit and the heater, and the contactor adopts a double-contact point redundant design.

[0036] Further, the operation process of the dynamic temperature control system is as follows:

[0037] S1: The dynamic temperature control system starts;

[0038] S21: The oil pump is not running, and remains in standby state;

[0039] S22: The oil pump is running, the inlet temperature sensor and the outlet temperature sensor are read, the temperature state is judged, and the temperature setting of the PID controller is set to 20℃;

[0040] When the bearing oil groove oil temperature measured by the outlet temperature sensor is lower than the set value by 2℃ or more, the full-power heating mode is started, and the heater is operated at full power;

[0041] When the bearing oil groove oil temperature enters the set value ± 0.5℃ interval, the PID proportional-integral-derivative adjustment is started, the PID algorithm is executed, the PWM signal is output, the heating power is adjusted, and if the temperature is stable, the current power is maintained, and if the temperature is not stable, the S22 step is repeated.

[0042] When the bearing oil groove oil temperature is greater than or equal to 20℃, the emergency power-off is triggered, the interlocking system is triggered, the heater power is forcibly cut off, and the system fault alarm is triggered.

[0043] Further, the interlocking response time sequence of the interlocking system is:

[0044] A1: The oil pump control unit releases the oil pump stop signal, which takes 0ms;

[0045] A2: After receiving the oil pump stop signal, the electromagnet releases the contact separation action instruction, which will have a mechanical response delay, which takes 50ms;

[0046] A3: The main contact is separated, which takes 200ms;

[0047] A4: The electric arc generated by the contactor continues to generate, and the magnetic blowout arc is started, which takes 200ms;

[0048] A5: Arc extinguishing detection is performed, and the arc is stretched and cooled every 10ms during the arc extinguishing process until the arc energy is zero, which takes 280ms;

[0049] A6: The contactor is disconnected, the arc generated by the contactor contact separation is extinguished, the heater is powered off, no heater current is generated, and the total time consumption is 730ms.

[0050] The beneficial effects of the present application are:

[0051] 1. The outer circulation unit of the present application is physically separated from the bearing oil groove, and has a height difference of not less than 0.5m, does not occupy the space in the oil groove, realizes convenient maintenance, and the heater realizes the gravity return oil seal of the lubricating oil, avoiding the oil breakage and dry burning of the heater.

[0052] 2. The cold oil input ring pipe and the hot oil output ring pipe in the bearing oil groove of the present application are respectively provided with oil inlet holes and oil injection holes, the oil inlet holes and the oil injection holes are staggered and arranged and have different opening directions, the uniform absorption of cold oil and the uniform injection of hot oil in the bearing oil groove are realized, the lubricating oil in the bearing oil groove is uniformly heated, and the temperature stratification phenomenon is avoided.

[0053] 3. The application uses oil pump motor and heater interlock, PTC ceramic heater temperature setting, PID controller control logic, triple protection, to prevent heater overheating accidents. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a structural schematic diagram of the application;

[0055] Figure 2 is Figure 1 A view;

[0056] Figure 3 is a timing diagram of the interlocking system in the application;

[0057] Figure 4 is a flow chart of the dynamic temperature control system in the application.

[0058] In the figure: 10 - bearing oil groove, 100 - external circulation unit, 101 - oil inlet, 102 - oil outlet, 200 - constant temperature heating module, 201 - heater, 300 - porous ring tube structure, 301 - cold oil input ring tube, 302 - oil suction hole, 303 - hot oil output ring tube, 304 - oil injection hole, 305 - flange connection structure, 400 - dynamic temperature control system, 401 - inlet temperature sensor, 402 - outlet temperature sensor, 403 - PID controller, 500 - interlocking system, 501 - contactor, 502 - oil pump motor main circuit, 503 - power supply circuit. DETAILED DESCRIPTION

[0059] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should be within the scope of protection of the present application.

[0060] The terms "set", "connected", "fixed" should be understood broadly. For example, "connected" can be fixed connection, detachable connection, or integral structure; can be mechanical connection, can be direct connection, or indirect connection through intermediate medium, or internal communication between two devices, elements or components. For the person skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0062] The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0063] The water turbine generator outer circulation bearing lubricating oil heating system of the present application comprises a bearing oil tank 10, an outer circulation unit 100, a constant temperature heating module 200, a porous ring pipe structure 300, a dynamic temperature control system 400, and an interlocking system 500.

[0064] The outer circulation unit 100 comprises an oil inlet pipeline and an oil outlet pipeline.

[0065] The porous ring pipe structure 300 comprises a cold oil input ring pipe 301 and a hot oil output ring pipe 303.

[0066] The dynamic temperature control system 400 comprises an inlet temperature sensor 401, an outlet temperature sensor 402, and a PID controller 403.

[0067] The constant temperature heating module 200, the PID controller 403, and the interlocking system 500 are arranged in the outer circulation unit 100, and the porous ring pipe structure 300 is arranged in the bearing oil tank 10.

[0068] The oil inlet 101 of the oil inlet pipeline extends into the bottom of the bearing oil tank 10 and is connected to the cold oil input ring pipe 301, and the other end is connected to the constant temperature heating module 200; the oil outlet 102 of the oil outlet pipeline extends into the bottom of the bearing oil tank 10 and is connected to the hot oil output ring pipe 303, and the other end is connected to the constant temperature heating module 200.

[0069] The arrangement height of the constant temperature heating module 200 is lower than the lowest oil level surface of the bearing oil tank 10.

[0070] The inlet temperature sensor 401 is arranged on the oil inlet pipeline.

[0071] The outlet temperature sensor 402 is arranged on the outer side wall of the bearing oil tank 10.

[0072] The PID controller 403 receives the signal of the outlet temperature sensor 402 and transmits the signal to the constant temperature heating module 200.

[0073] More specifically, the height difference between the arrangement height of the constant temperature heating module 200 and the lowest oil level surface of the bearing oil tank 10 is not less than 0.5 m, and the horizontal pipeline of the oil inlet 101 has an inclination angle of ≥5°, which ensures that the constant temperature heating module 200 is full of lubricating oil in any case, guarantees that the lubricating oil forms a gravity oil return seal, and prevents the constant temperature heating module 200 from dry burning.

[0074] More specifically, the constant temperature heating module 200 is composed of several groups of heaters 201, and the upper limit of the working temperature is set to 80℃.

[0075] More specifically: the heater 201 is a series PTC ceramic heater, the power density is 8-10W / cm 3 .

[0076] More specifically: the packaging thickness d of the heater 201 satisfies:

[0077] d=V rms / 8+1.2;

[0078] Wherein, d is the packaging thickness, unit: mm;

[0079] V rms is the rated voltage effective value of the heater 201, unit: kV;

[0080] The packaging thickness of the heater 201 is related to the working voltage, which ensures that no packaging leakage occurs under any circumstances.

[0081] More specifically: the cold oil input ring pipe 301 is circumferentially arranged at the bottom of the bearing oil groove 10, and the oil suction hole 302 is horizontally and outwardly arranged.

[0082] More specifically: the hot oil output ring pipe 303 is circumferentially arranged at the bottom of the bearing oil groove 10, and the oil injection hole 304 is upwardly arranged.

[0083] More specifically: the hole diameter of the oil suction hole 302 is 10mm, the hole spacing is 1.4 times the diameter of the cold oil input ring pipe 301, and the total opening area is ≥3 times the cross-sectional area of the cold oil input ring pipe 301;

[0084] The hole diameter of the oil injection hole 304 is 10mm, the hole spacing is 1.4 times the diameter of the hot oil output ring pipe 303, and the total opening area is ≥3 times the cross-sectional area of the hot oil output ring pipe 303;

[0085] The oil suction hole 302 and the oil injection hole 304 are staggered on the circumference, and the number is equal, so as to realize the uniform suction of the cold oil in the bearing oil groove 10 and the uniform injection of the hot oil, suppress the jet interference between the injected oil flow and the suction oil flow, make the lubricating oil in the bearing oil groove 10 heated uniformly, and avoid temperature stratification phenomenon.

[0086] More specifically: the oil inlet 101 and the cold oil input ring pipe 301 are connected through the flange connection structure 305, the oil outlet 102 and the hot oil output ring pipe 303 are connected through the flange connection structure 305, when the external circulating unit 100 needs to maintain the equipment and pipeline outside the bearing oil groove 10, it is convenient to disassemble and install.

[0087] More specifically: the type of the inlet temperature sensor 401 is PT100, the precision is ±0.1℃, and the inlet temperature is monitored.

[0088] The outlet temperature sensor 402 is a PT100 model, which avoids the thermal boundary layer and monitors the lubricating oil temperature in the middle of the bearing oil groove 10.

[0089] The PID controller 403 reads the oil temperature value measured by the outlet temperature sensor 402 in the bearing oil groove 10, compares the deviation with the oil temperature set value of 20℃, and controls the heating operation power and the start-stop of the heater 201 according to the deviation through proportional-integral-derivative control.

[0090] More specifically, the thermostat heating module 200 has a temperature self-limiting function. When the temperature approaches the set temperature, the heater 201 can automatically reduce the power operation, and the Curie effect is used to passively limit the temperature to prevent the lubricating oil from deteriorating due to high temperature.

[0091] More specifically, the interlocking system 500 includes a contactor 501, an oil pump motor main circuit 502, and a power supply circuit 503.

[0092] The power supply circuit 503 is arranged at the lower left corner of the interlocking mechanism 500, the oil pump motor main circuit 502 is arranged at the lower right corner of the interlocking mechanism 500, the oil pump motor main circuit 502 is connected with the oil pump, the oil pump control unit is arranged at the upper right corner of the interlocking mechanism 500, the oil pump control unit transmits signals to the oil pump, and the contactor 501 is between the oil pump motor main circuit 502 and the power supply circuit 503.

[0093] The interlocking system 500 adopts a mechanical interlocking structure, the contactor 501 synchronously controls the power supply circuit 503 of the oil pump motor main circuit 502 and the heater 201, the contactor 501 adopts a double-contact redundant design, the interlocking response time of the interlocking system 500 is less than 1s, and the heater 201 is powered off in seconds after the oil pump stops, which ensures safety and prevents the lubricating oil from circulating in the external circulation unit 100 when the oil pump abnormally stops, causing overheating and deterioration.

[0094] More specifically, the operation process of the dynamic temperature control system 400 is as follows:

[0095] S1: The dynamic temperature control system 400 is started;

[0096] S21: The oil pump is not running, and the standby state is maintained;

[0097] S22: The oil pump is running, the inlet temperature sensor 401 and the outlet temperature sensor 402 are read, the temperature state is judged, and the temperature set value of the PID controller 403 is set to 20℃;

[0098] When the oil temperature in the bearing oil groove 10 measured by the outlet temperature sensor 402 is lower than the set value by 2℃ or more, the full-power heating mode is started, and the heater 201 is operated at full power;

[0099] When the oil temperature in the bearing oil groove 10 enters the set value ±0.5℃ interval, start the PID proportional-integral-derivative adjustment, execute the PID algorithm, output the PWM signal, adjust the heating power, if the temperature is stable, maintain the current power, if the temperature is not stable, repeat the S22 step;

[0100] When the oil temperature in the bearing oil groove 10 is ≥20℃, the emergency power-off triggers the interlocking system 500, forcibly cuts off the power supply of the heater 201, and the system fault alarm.

[0101] More specifically: the interlocking response time sequence of the interlocking system 500 is:

[0102] A1: The oil pump control unit releases the oil pump stop signal, which takes 0ms;

[0103] A2: After receiving the oil pump stop signal, the electromagnet releases the contact separation action instruction, which will have a mechanical response delay, which takes 50ms;

[0104] A3: The main contact is separated, which takes 200ms;

[0105] A4: The electric arc generated by the contactor 501 continues to generate, and the magnetic blowout arc extinguishing is started, which takes 200ms;

[0106] A5: Arc extinguishing detection is performed, and the arc is stretched and cooled every 10ms during the arc extinguishing process until the arc energy is zero, which takes 280ms;

[0107] A6: The contactor 501 is disconnected, the arc generated by the contactor 501 contact separation is extinguished, the heater 201 is powered off, and no heater current is generated, which takes a total of 730ms.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; as long as there is no structural conflict, each feature in the specific embodiments disclosed in the present application can be used in combination with any other feature, and the corresponding technical solution will not deviate from the scope of the technical solutions of the present application.

[0109] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A hydro-generator external circulation bearing lubricating oil heating system, characterized in that: It includes a bearing oil tank (10), an external circulation unit (100), a constant temperature heating module (200), a porous annular tube structure (300), a dynamic temperature control system (400), and an interlocking system (500); The external circulation unit (100) comprises an oil inlet pipeline and an oil outlet pipeline; The porous annular pipe structure (300) comprises a cold oil input annular pipe (301) and a hot oil output annular pipe (303); The dynamic temperature control system (400) includes an inlet temperature sensor (401), an outlet temperature sensor (402), and a PID controller (403); The constant temperature heating module (200), the PID controller (403), and the interlocking system (500) are all arranged in the external circulation unit (100), and the porous annular tube structure (300) is arranged in the bearing oil groove (10); The oil inlet (101) of the oil inlet pipeline extends into the bottom of the bearing oil groove (10) and is connected to the cold oil input ring pipe (301), and the other end is connected to the constant temperature heating module (200); the oil outlet (102) of the oil outlet pipeline extends into the bottom of the bearing oil groove (10) and is connected to the hot oil output ring pipe (303), and the other end is connected to the constant temperature heating module (200); The arrangement height of the constant temperature heating module (200) is lower than the lowest oil level of the bearing oil groove (10); The inlet temperature sensor (401) is arranged on the oil inlet pipeline; The outlet temperature sensor (402) is arranged on the outer side wall of the bearing oil groove (10); The PID controller (403) receives a signal from the outlet temperature sensor (402) and transmits the signal to the constant temperature heating module (200).

2. A hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The height difference between the arrangement height of the constant temperature heating module (200) and the lowest oil level of the bearing oil groove (10) is not less than 0.5 m, and the horizontal pipe inclination angle of the oil inlet (101) is ≥5°.

3. A hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The constant temperature heating module (200) is composed of a plurality of groups of heaters (201), and the upper limit of the operating temperature is set at 80°C; The heater (201) is a series PTC ceramic heater with a power density of 8-10 W / cm 3 ; The package thickness d of the heater (201) satisfies: d=V rms / 8+1.2; Where, d is the package thickness in mm; V rms is the effective value of the rated voltage of the heater (201), in kV.

4. A hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The cold oil input annular pipe (301) is circumferentially arranged at the bottom of the bearing oil groove (10), and is provided with an oil suction hole (302) horizontally outwardly; The hot oil output annular pipe (303) is circumferentially arranged at the bottom of the bearing oil groove (10) and is provided with an oil spray hole (304) upward.

5. A hydro-generator external circulation bearing lubricating oil heating system according to claim 4, characterized in that: The oil suction hole (302) has a diameter of 10 mm, a hole spacing of 1.4 times the diameter of the cold oil input ring pipe (301), and a total opening area ≥ 3 times the cross-sectional area of ​​the cold oil input ring pipe (301); The oil injection holes (304) have a diameter of 10 mm, a hole spacing of 1.4 times the diameter of the hot oil output ring pipe (303), and a total opening area ≥ 3 times the cross-sectional area of ​​the hot oil output ring pipe (303); The oil suction holes (302) and the oil injection holes (304) are staggered and arranged on the circumference, and the number is equal.

6. A hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The model of the inlet temperature sensor (401) is PT100, with an accuracy of ±0.1°C; The model of the outlet temperature sensor (402) is PT100.

7. A hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The oil inlet (101) is connected to the cold oil input ring pipe (301) via a flange connection structure (305), and the oil outlet (102) is connected to the hot oil output ring pipe (303) via a flange connection structure (305).

8. The hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The interlocking system (500) includes a contactor (501), an oil pump motor main circuit (502), and a power supply circuit (503); The power supply circuit (503) is arranged at the lower left corner of the interlocking mechanism (500), the oil pump motor main circuit (502) is arranged at the lower right corner of the interlocking mechanism (500), the oil pump motor main circuit (502) is connected to the oil pump, the oil pump control unit is arranged at the upper right corner of the interlocking mechanism (500), the oil pump control unit transmits signals to the oil pump, and the contactor (501) is between the oil pump motor main circuit (502) and the power supply circuit (503); The interlocking system (500) adopts a mechanical interlocking structure, and the contactor (501) synchronously controls the main circuit (502) of the oil pump motor and the power circuit (503) of the heater (201). The contactor (501) adopts a double-contact redundancy design.

9. The hydro-generator external circulation bearing lubricating oil heating system according to claim 1, characterized in that: The operation process of the dynamic temperature control system (400) is as follows: S1: Dynamic temperature control system (400) starts; S21: The oil pump does not run and remains in standby mode; S22: The oil pump is running, and the inlet temperature sensor (401) and the outlet temperature sensor (402) are read to determine the temperature status, and the temperature of the PID controller (403) is set to 20°C; When the oil temperature in the bearing oil tank (10) measured by the outlet temperature sensor (402) is lower than the set value by more than 2°C, the full power heating mode is turned on and the heater (201) operates at full power; When the oil temperature in the bearing oil tank (10) enters the range of ±0.5°C of the set value, the PID proportional-integral-differential adjustment is started, the PID algorithm is executed, the PWM signal is output, and the heating power is adjusted. If the temperature is stable, the current power is maintained. If the temperature is unstable, step S22 is repeated. When the oil temperature in the bearing oil tank (10) is ≥20°C, an emergency power outage is triggered, the interlock system (500) is triggered, the power supply to the heater (201) is forcibly cut off, and a system fault alarm is sounded.

10. A hydro-generator external circulation bearing lubricating oil heating system according to claim 9, characterized in that: The interlocking response timing chain of the interlocking system (500) is: A1: The oil pump control unit releases the oil pump stop signal, and the time taken is 0ms. A2: After receiving the oil pump stop signal, the electromagnet releases the contact separation action command, which causes a mechanical response delay of 50ms. A3: Main contacts separate, which takes 200ms. A4: The arc generated by the contactor (501) continues to generate, and the magnetic blowout is started, which takes 200ms; A5: Perform arc extinction detection. During the arc extinction process, the arc is stretched and cooled every 10ms until the arc energy returns to zero. This takes 280ms. A6: The contactor (501) is disconnected, the arc generated by the separation of the contactor (501) contacts is extinguished, the heater (201) is de-energized, and no heater current is generated. The total time taken is 730ms.

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