阅读说明：本技术 由永磁无刷电动机与直流电动机组成的润滑油供油系统 (Lubricating oil supply system composed of permanent magnet brushless motor and direct current motor ) 是由 史沁鹏 李�和 于 2019-07-02 设计创作，主要内容包括：本发明由永磁无刷电动机与直流电动机组成的润滑油供油系统,包括第一供油模块、第二供油模块、事故供油模块、润滑油处理模块以及润滑油出口,其特征在于,其中,第一供油模块包括第一永磁无刷直流电动机、第一驱动器、第一直流电源、第一主油泵及第一输油管道；第一永磁无刷直流电动机通过第一驱动器与第一直流电源连接；再有,第二供油模块包括第二永磁无刷直流电动机、第二驱动器、第二直流电源、第二主油泵及第二输油管道；第二永磁无刷直流电动机通过第二驱动器与第二直流电源连接；实现了对于两个主油泵的缓慢起动或停止,事故油泵的缓慢起停及快速起动,确保供油不中断,同时还可以减少对于供电系统的冲击,进一步提升经济和社会效益。(The invention relates to a lubricating oil supply system consisting of a permanent magnet brushless motor and a direct current motor, which comprises a first oil supply module, a second oil supply module, an accident oil supply module, a lubricating oil processing module and a lubricating oil outlet, and is characterized in that the first oil supply module comprises a first permanent magnet brushless direct current motor, a first driver, a first direct current power supply, a first main oil pump and a first oil pipeline; the first permanent magnet brushless direct current motor is connected with a first direct current power supply through a first driver; furthermore, the second oil supply module comprises a second permanent magnet brushless direct current motor, a second driver, a second direct current power supply, a second main oil pump and a second oil pipeline; the second permanent magnet brushless direct current motor is connected with a second direct current power supply through a second driver; the slow start or stop of the two main oil pumps and the slow start, stop and fast start of the accident oil pump are realized, the oil supply is ensured not to be interrupted, meanwhile, the impact on a power supply system can be reduced, and the economic and social benefits are further improved.)

1. Lubricating oil feeding system by permanent magnet brushless motor and direct current motor constitution, including first fuel feeding module (101), second fuel feeding module (102), accident fuel feeding module (103), lubricating oil processing module (200) and lubricating oil export (300), its characterized in that:

the first oil supply module (101) comprises a first permanent magnet brushless direct current motor (1), a first driver (4), a first direct current power supply (7), a first main oil pump (10) and a first oil pipeline (17);

the first permanent magnet brushless direct current motor (1) is connected with the first direct current power supply (7) through the first driver (4); one end of the first main oil pump (10) is connected with the first permanent magnet brushless direct current motor (1), and the other end of the first main oil pump is connected with the first oil pipeline (17);

furthermore, the second oil supply module (102) comprises a second permanent magnet brushless motor (2), a second driver (5), a second direct current power supply (8), a second main oil pump (11) and a second oil pipeline (18);

the second permanent magnet brushless direct current motor (2) is connected with the second direct current power supply (8) through the second driver (5); one end of the second main oil pump (11) is connected with the second permanent magnet brushless direct current motor (8), and the other end of the second main oil pump is connected with the second oil pipeline (18);

one end of the first oil pipeline (17) and one end of the second oil pipeline (18) are respectively connected with the lubricating oil treatment module (200); the first oil supply module (101) and the second oil supply module (102) are connected to the lubricating oil treatment module (200) in parallel through the first oil pipeline (17) and the second oil pipeline (18) respectively.

2. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 1, wherein:

the emergency oil supply system also comprises an emergency oil supply module (103) which comprises a direct-current power supply (9), a controller (6), a direct-current motor (3), an emergency oil pump (12) and an emergency oil pipeline (19);

the direct current motor (3) is connected with the third direct current power supply (9) through the controller (6); one end of the accident oil pump (12) is connected with the direct current motor (3), and the other end of the accident oil pump is connected with the accident oil pipeline (19);

one end of the accident oil conveying pipeline (19) is connected with the lubricating oil outlet (300); the accident oil supply module (103) is directly connected to the lubricating oil outlet (300) through the accident oil delivery pipe (19).

3. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the first direct current power supply (7) and the second direct current power supply (8) are the same power supply;

the third direct current power supply (9) is an independent power supply.

4. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the first direct current power supply (7), the second direct current power supply (8) and the third direct current power supply (9) are the same power supply.

5. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the rated voltage of the third direct current power supply (9) is 220V.

6. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the rated voltage of the first direct current power supply (7) is the same as that of the second direct current power supply (8).

7. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the rated voltage of the first permanent magnet brushless direct current motor (1) and the second permanent magnet brushless direct current motor (2) is 220V, and the rated voltage of the first direct current power supply (7) and the second direct current power supply (8) is 380V.

8. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the rated voltage of the first permanent magnet brushless direct current motor (1) and the second permanent magnet brushless direct current motor (2) is 380V, and the rated voltage of the first direct current power supply (7) and the second direct current power supply (8) is 530V.

9. The lubricating oil supply system composed of the permanent magnet brushless motor and the dc motor according to claim 2, wherein:

the rated voltage of the first permanent magnet brushless direct current motor (1) and the second permanent magnet brushless direct current motor (2) is 122V, and the rated voltage of the first direct current power supply (7) and the second direct current power supply (8) is 220V.

Technical Field

The invention relates to the field of thermal power generation, in particular to a lubricating oil supply system consisting of a permanent magnet brushless motor and a direct current motor.

Background

A power generating unit in a thermal power plant is a machine that rotates at high speed during power generating operation, and a large amount of oil is required for lubrication of an operation joint portion between a support bearing and a thrust bearing and a friction portion that operates at high speed. The oil supply system for supplying lubricating oil as a generator set causes serious damage to the equipment of the generator set even if a short interruption occurs, and therefore, it is necessary to ensure continuous and stable operation of the lubricating oil system.

At present, lubricating oil supply systems of generator sets in thermal power plants are mainly two types:

the system 1: 1 start/stop oil pump driven by an alternating current motor, a coaxial working oil pump of a main machine large shaft and 1 accident oil pump driven by a direct current motor are adopted during starting;

and (3) system 2: 2 oil pumps driven by AC motor for start/stop and work +1 accident oil pump driven by DC motor.

The system 1 is mainly characterized in that an oil pump driven by an alternating current motor is used during starting and stopping, a coaxial oil pump installed on a shaft of a turbogenerator is used for supplying oil during normal operation, and the oil pump driven by the direct current motor is started for supplying oil during accidents. Because the shafting mass of the generator set is very large, the inertia is very large, and when an accident occurs, the time for reducing the rated rotating speed to the state of not meeting the oil supply condition by only depending on the inertia of the generator set needs about 1 minute or more, so the starting time of the oil pump driven by the direct current motor is not very fast once the accident occurs in the system; however, the system 2 is different from the system 1, and is the same as the system 1 in normal start/stop, and also adopts an oil pump driven by an alternating current motor as a start oil pump and a stop oil pump, but still adopts an oil pump driven by an alternating current motor as a working oil pump when the generator set is in normal operation; in case of accident, because the inertia of the ac motor and the oil pump driven by the ac motor is very small, the oil pump will not provide enough lubricating oil quickly once the motor is out of power, and for this reason, the emergency oil pump driven by the dc motor must be started at a fast speed to provide lubricating oil for the generator set instead of the working oil pump in a short time, so as to ensure that the supply of lubricating oil is not interrupted, so as to prevent the shafting of the generator set from being damaged.

The starting of the direct current motor in the system 1 and the system 2 is realized by connecting a starting resistor in series in an armature loop of the direct current motor; the system 1 is only used when the requirements on the starting speed and the starting time are not strict, so that the resistance value of the used starting resistor is larger, and the starting current is relatively smaller; in the system 2, the requirement on the starting speed is very fast, and the requirement on the starting time is very short, so that the resistance value of the starting resistor connected in series is very small, and the starting current is very large; when the system 2 loses the alternating current power supply once an accident occurs in actual operation, the requirements on the starting speed and the time of an accident oil pump driven by a direct current motor are stricter, so that the operation risk is high, but for generator sets such as a combustion engine and the like, only the system 2 with high operation risk can be adopted for supplying oil based on the structure of the generator sets.

In view of the problems of the lubricating oil system of the system 2, in order to reduce the risk of oil supply interruption, a brand new lubricating oil driving mode needs to be provided, the original oil pump driving mode is improved, the reliability of the lubricating oil system is greatly improved, meanwhile, the impact on a power supply system can be reduced, the supply of lubricating oil is ensured not to be interrupted, the running stability of a generator set can be improved, the probability and risk of damage of a shafting are reduced, the running time of the generator set is prolonged, and the economic and social benefits are further improved.

Disclosure of Invention

In view of the above-mentioned deficiency of the prior art, the invention proposes the lubricating oil supply system composed of permanent magnet brushless motor and direct current motor innovatively, it has changed the system architecture that the oil pump of starting/stopping and working that is driven by 2 alternating current motors starts in the original lubricating oil system +1 accident oil pump that direct current motor drives starts, adopt the direct current power supply to connect the permanent magnet brushless motor drive through the driver when starting normally, stopping and running 2 main oil pumps, start/stop of the accident oil pump also adopts the direct current power supply to connect the direct current motor drive through the controller at the same time; therefore, the main oil pump can be slowly and gradually started and stopped, and the accident oil pump can be respectively slowly started and quickly started in different accident conditions, so that the continuous supply of lubricating oil is ensured, the shafting safety of the generator set is protected, the impact on a power supply and mechanical equipment caused by the sudden start/stop of the main oil pump and the sudden start of the accident oil pump in the process of sudden start is reduced, the generator set, the power supply and the mechanical equipment are protected, the running time of the generator set is prolonged, and the economic and social benefits are further improved.

The technical means adopted by the invention are as follows:

the invention provides a lubricating oil supply system consisting of a permanent magnet brushless motor and a direct current motor, which comprises a first oil supply module, a second oil supply module, an accident oil supply module, a lubricating oil processing module and a lubricating oil outlet, and is characterized in that the first oil supply module comprises a first permanent magnet brushless direct current motor, a first driver, a first direct current power supply, a first main oil pump and a first oil pipeline; the first permanent magnet brushless dc motor is connected to the first dc power supply through the first driver; one end of the first main oil pump is connected with the first permanent magnet brushless direct current motor, and the other end of the first main oil pump is connected with the first oil pipeline; moreover, the second oil supply module comprises a second permanent magnet brushless motor, a second driver, a second direct-current power supply, a second main oil pump and a second oil pipeline; the second permanent magnet brushless dc motor is connected to the second dc power supply through the second driver; one end of the second main oil pump is connected with the second permanent magnet brushless direct current motor, and the other end of the second main oil pump is connected with the second oil pipeline; one end of the first oil pipeline and one end of the second oil pipeline are respectively connected with the lubricating oil treatment module; the first oil supply module and the second oil supply module are respectively connected to the lubricating oil treatment module in parallel through the first oil conveying pipeline and the second oil conveying pipeline.

The lubricating oil supply system composed of the permanent magnet brushless motor and the direct current motor further has the following characteristics.

The emergency oil supply module comprises a direct-current power supply, a controller, a direct-current motor, an emergency oil pump and an emergency oil pipeline; the dc motor is connected to the third dc power supply through the controller; one end of the accident oil pump is connected with the direct current motor, and the other end of the accident oil pump is connected with the accident oil pipeline; the accident oil supply module is directly connected to the lubricating oil outlet through the accident oil pipeline.

In addition, the lubricating oil supply system consisting of the permanent magnet brushless motor and the direct current motor has the following characteristics.

The first direct current power supply and the second direct current power supply are the same power supply, and the third direct current power supply is an independent power supply; the first direct current power supply, the second direct current power supply and the third direct current power supply are the same power supply; the rated voltage of the third direct current power supply is 220V; the rated voltage of the first direct current power supply is the same as that of the second direct current power supply; the rated voltage of the first permanent magnet brushless dc motor and the second permanent magnet brushless dc motor is 220V, and the rated voltage of the first dc power supply and the second dc power supply is 380V; when the rated voltage of the first permanent magnet brushless dc motor and the second permanent magnet brushless dc motor is 380V, the rated voltage of the first dc power supply and the second dc power supply is 530V; when the rated voltage of the first permanent magnet brushless dc motor and the second permanent magnet brushless dc motor is 122V, the rated voltage of the first dc power supply and the second dc power supply is 220V.

Advantageous effects

Through the lubricating oil feeding system of the permanent magnet brushless motor and the DC motor, improve the original drive oil pump mode, the permanent magnet brushless DC motor driven by the driver and the DC motor controlled by the controller, and the DC power supply supplies power, the slow start or stop of the two main oil pumps, the slow start or stop and the quick start of the accident oil pump are realized, the reliability of the lubricating oil system is greatly improved, meanwhile, the impact on the power supply system can be reduced, the supply of the lubricating oil is ensured not to be interrupted, the running stability of the generator set can be improved, the probability and the risk of damage of a shafting of the generator set are reduced, the running time of the generator set is prolonged, and the economic and social benefits are further improved.

Drawings

Fig. 1 is a schematic structural diagram of a lubricating oil supply system composed of a permanent magnet brushless motor and a dc motor according to the present invention, in which names and connection relationships of key devices of the system structure are indicated.

Fig. 2 is a schematic structural view of a conventional lubricating oil supply system 2 (start/stop and operation oil pumps driven by 2 ac motors + accident oil pumps driven by 1 dc motor).

Description of the reference symbols:

1: a first permanent magnet brushless DC motor;

2: a second permanent magnet brushless DC motor;

3: a DC motor;

4: a first driver;

5: a second driver;

6: a controller;

7: a first direct current power supply;

8: a second direct current power supply;

9: a third DC power supply;

10: a first main oil pump;

11: a second main oil pump;

12: an emergency oil pump;

13: a first oil cooler;

14: a second oil cooler;

15: a first oil filter;

16: a second oil filter;

17: a first oil transport pipeline;

18: a second oil transport pipeline;

19: an accident oil pipeline;

101: a first oil supply module;

102: a second oil supply module;

103: an accident oil supply module;

200: a lubricating oil treatment module;

300: and a lubricating oil outlet.

Detailed Description

The following detailed description of the embodiments, structures, features and effects of the lubricant oil supply system composed of a permanent magnet brushless motor and a dc motor according to the present invention will be made with reference to the accompanying drawings, wherein:

fig. 1 is a schematic diagram showing a structure of a lubricating oil supply system composed of a permanent magnet brushless motor and a dc motor according to the present invention; as can be seen from the figure, the system comprises a first oil supply module 101, a second oil supply module 102, an accident oil supply module 103, a lubricating oil treatment module 200 and a lubricating oil outlet 300, and is characterized in that: the first oil supply module 101 includes a first permanent magnet brushless dc motor 1, a first driver 4, a first dc power supply 7, a first main oil pump 10, and a first oil pipeline 17; the first permanent magnet brushless dc motor 1 is connected to the first dc power supply 7 through the first driver 4; one end of the first main oil pump 10 is connected to the first permanent magnet brushless dc motor 1, and the other end is connected to the first oil pipeline 17; the second oil supply module 102 includes a second permanent magnet brushless motor 2, a second driver 5, a second dc power supply 8, a second main oil pump 11, and a second oil pipeline 18; the second permanent magnet brushless dc motor 2 is connected to the second dc power supply 8 via the second driver 5; one end of the second main oil pump 11 is connected to the second permanent magnet brushless dc motor 8, and the other end is connected to the second oil pipeline 18; one end of each of the first oil pipeline 17 and the second oil pipeline 18 is connected to the lubricating oil treatment module 200, and the first oil supply module 101 and the second oil supply module 102 are connected to the lubricating oil treatment module 200 through the first oil pipeline 17 and the second oil pipeline 18 in parallel; as mentioned above, the two main oil supply modules in the lubricating oil supply system, the first oil supply module 101 and the second oil supply module 102, both adopt the structure of the permanent magnet brushless dc motor with a driver, wherein the first driver 4 and the second driver 5 are respectively composed of novel power electronic accessories matched with the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 connected thereto, for example, IGBT insulated gate bipolar transistor, which can realize smooth and impact-free starting or stopping of the driving motor by controlling the gradual increase or decrease of the current by the driver; when the motor is started and enters normal operation, the driver provides a power supply with stable frequency, and the stable frequency can be power frequency or other frequencies; meanwhile, the driver adopts the flexible technology of gradually reducing the power supply current of the motor and slowly stopping when the motor stops running, so that the damage to the inverter caused by too high back electromotive force during braking of the high-speed motor is avoided; in addition, because the first permanent magnet brushless direct current motor 1 and the second permanent magnet brushless direct current motor 2 which drive the two main oil pumps respectively use the direct current power supplies of the first direct current power supply 7 and the second direct current power supply 8 for supplying power, when a generator set accident starts, even if all the generator sets of a power plant are powered off, the first main oil pump 10 and the second main oil pump 11 can still continue to operate by using the direct current power supplies without stopping, and thus continuous oil supply of a lubricating oil system is ensured.

Wherein the present invention further has the following structural features as shown in fig. 1.

The emergency oil supply system also comprises an emergency oil supply module 103, which comprises a direct-current power supply 9, a controller 6, a direct-current motor 3, an emergency oil pump 12 and an emergency oil pipeline 19; the dc motor 3 is connected to the third dc power supply 9 through the controller 6; one end of the emergency oil pump 12 is connected to the dc motor 3, and the other end is connected to the emergency oil pipeline 19; the emergency oil supply module 103 is directly connected to the lubricant outlet 300 through the emergency oil delivery pipe 19; the controller 6 adopted in the emergency oil supply module 103 as described above is composed of a novel power electronic device, and can provide 2 starting modes for the connected dc motor 3, one of which is to realize slow start and stop of the dc motor 3 by controlling the output current to slowly increase or slowly decrease, so as to reduce the impact on the equipment (including the power supply, the motor and the oil pump), and the other is that when the rapid start is required, the current output by the controller 6 can be continuously maintained at the maximum current allowed by the dc motor 3 until the motor start is completed, so that the fastest starting speed can be achieved; and in both starting modes, the controller 6 always outputs direct current.

In addition, the circuit structure of the invention also has the following characteristics.

If the first dc power supply 7 and the second dc power supply 8 are the same power supply, the third dc power supply 9 is an independent power supply; the first dc power supply 7, the second dc power supply 8, and the third dc power supply 9 may be the same power supply; the first dc power supply 7 and the second dc power supply 8 have the same rated voltage; when the rated voltage of the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 is 220V, the rated voltage of the first dc power supply 7 and the second dc power supply 8 is 380V; when the rated voltage of the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 is 380V, the rated voltage of the first dc power supply 7 and the second dc power supply 8 is 530V; when the rated voltage of the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 is 122V, the rated voltage of the first dc power supply 7 and the second dc power supply 8 is 220V. As can be seen from the voltage setting relationship between the permanent magnet brushless dc motor and the dc power supply, if the rated voltages of the first dc power supply 7 and the second dc power supply 8 are required to be the same as the rated voltage of the third dc power supply 9, the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 can only select a product with a rated voltage of 155V, which requires a special motor; if the selected dc power voltage is 380V or 530V, both the first permanent magnet brushless dc motor 1 and the second permanent magnet brushless dc motor 2 may be a general-purpose product.

The invention has the following characteristics in practical application.

When the generator set has an accident, even if the alternating current power supply is lost, the motors of the first main oil pump 10 and the second main oil pump 11 in operation still continue to operate due to the adoption of the permanent magnet brushless direct current motors driven by the direct current power supply through the driver, and the supply of lubricating oil is not interrupted, so that the motors of the accident oil pump 12 can still be slowly started by adopting a flexible technology, and the operation of the main oil pump is stopped after the start is finished, so that the oil supply system is not interrupted when the accident happens, and the impact damage caused by sudden braking of each motor, each oil pump and each power supply device can be prevented.

In the starting process of the generator set, the first main oil pump 10 or the second main oil pump 11 can be started at will, and as the generator set is started normally, slow flexible starting can be adopted, so that impact on a power supply and mechanical equipment can not be caused, and the service life of machinery can be prolonged; in the normal running process of the generator set, the other main oil pump can be started at any time by using a flexible technology, after the starting is finished, the main oil pump in the original running process is slowly stopped, so that the alternate running of the first main oil pump 10 and the second main oil pump 11 can be realized, in the alternate running process, impact is not generated on a power supply, impact is not generated on equipment, and the interruption of lubricating oil is not caused, and in the normal stopping process of a lubricating oil system, the main oil pump in the running process can be slowly stopped by using the flexible technology.

The main oil pump stops running due to reasons in operation, the direct current motor 3 of the accident oil pump 12 can be quickly started by means of the condition that a tripping signal of a power supply of the main oil pump motor and a system oil pressure drop signal form an OR, and when the direct current motor 3 driven by a controller 6 consisting of power electronic devices needs to be quickly started, a large constant current can be provided for the direct current motor 3, so that the direct current motor 3 is quickly started, the starting speed is greatly increased compared with the starting speed of the existing direct current power supply and a starting resistor which directly drive the direct current motor, the continuous supply of lubricating oil can be ensured, and the shafting safety of a generator set is more reliably ensured; after the emergency oil pump 12 is started, if the ac power supply supplying power to the dc power supply 3 still has the power supply condition, another good main oil pump can be started, and the emergency oil pump 12 is removed after the start is completed, so that the lubricating oil supplied to the generator set can still be optimally processed by the first oil cooler 13 and the first oil filter 15 or the second oil cooler 14 and the second oil filter 16 in the lubricating oil processing module 200, and thus, the quality of the certified lubricating oil with higher quality can be ensured.

The invention improves the original mode of driving the oil pump by innovatively providing the lubricating oil supply system consisting of the permanent magnet brushless motor and the direct current motor, thereby greatly improving the reliability of the lubricating oil system, simultaneously reducing the impact on the power supply system and ensuring the uninterrupted supply of the lubricating oil, thereby improving the running stability of the generator set, reducing the probability and risk of damaging a shafting, prolonging the running time of the generator set and further improving the economic and social benefits.