Alternating current lubricating oil pump and jacking oil pump control system

Abstract

The invention relates to an alternating current lubricating oil pump and top shaft oil pump control system. An instruction sending module is used for sending an instruction to a relay module; the relay module is used for completing relay action under the control of the instruction sending module; the instruction execution and feedback module is used for displaying the state of the relay after the relay acts and starting the alternating-current lubricating oil pump and the jacking oil pump. When a DCS controller is abnormal, an AC / DC oil pump is not in an automatic position or a direct-current oil pump two-position relay K45 is in a reset position, as long as an alternating-current lubricating oil pump two-position relay K91 is in a set state, an alternating-current lubricating oil pump is started, and after the alternating-current lubricating oil pump is started, when oil pressure is larger than 40%, an alternating-current jacking oil pump can be automatically started; by means of the design, the safety of the unit is guaranteed to the maximum extent, and the situation that when a control system breaks down and cannot send an instruction, and the control system loses power, the alternating current lubricating oil pump and the top shaft oil pump are started, and the unit safely runs down in a coasting mode is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to an AC lubricating oil pump and a top shaft oil pump control system. Background Art

[0002] At present, steam turbines are equipped with AC lubricating oil pumps, which have independent power supplies and are usually put into use when the main oil pump is not working. The AC lubricating oil pump is a guarantee for the safe shutdown of the steam turbine generator set. In any case, the AC lubricating oil pump must be kept in hot standby state.

[0003] In order to realize the automatic start of the AC lubricating oil pump, the existing technology starts the AC lubricating oil pump by low oil pressure. However, this starting method cannot start the AC lubricating oil pump when the DCS control system fails or the oil pump is not put into automatic operation, which poses a great risk. Therefore, it is necessary to propose a further solution to the above problem. Summary of the invention

[0004] The technical problem to be solved by the present invention is to study an AC lubricating oil pump top shaft oil pump control system, which can automatically start the AC lubricating oil pump if the DCS controller is abnormal or the AC / DC oil pump is not in the automatic position.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] An AC lubricating oil pump and a top shaft oil pump control system, comprising a command sending module, a relay module and a command execution and feedback module;

[0007] The instruction sending module is used to send instructions to the relay module;

[0008] The relay module is used to complete the relay action under the control of the command sending module;

[0009] The instruction execution and feedback module is used to display the status of the relay and start the AC lubricating oil pump and the top shaft oil pump after the relay is actuated.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the relay module includes a double-position relay K91, a relay K92, a relay K90, and a double-position relay K45.

[0012] Furthermore, the two-position relay K91 is a bistable key-locking relay.

[0013] Furthermore, the instructions sent by the instruction sending module include a reset instruction of the double-position relay K91, a setting instruction of the double-position relay K91, an AC lubricating oil pump and a top shaft oil pump no tripping instruction, and a lubricating oil pressure greater than 40% instruction.

[0014] Furthermore, the AC lubricating oil pump and the top shaft oil pump have no tripping instructions, which specifically include: the DCS controller is normal, the AC / DC lubricating oil pump is in automatic position, and the DC lubricating oil pump double-position relay K45 is set.

[0015] Furthermore, the two-position relay K91 receives the setting and resetting instructions of the AC lubricating oil pump / top shaft oil pump. When receiving the setting instruction, the auxiliary contact of the two-position relay K91 is closed, and the instruction execution and feedback module displays that the two-position relay K91 has been set.

[0016] Furthermore, in the normal state of the steam turbine generator set, the auxiliary contact of relay K92 is disconnected and the AC lubricating oil pump is not started; when the two-position relay K91 is in the set state, if the DCS controller is abnormal or the AC or DC oil pump is not in the automatic position or the DC oil pump two-position relay K45 is in the reset position, the auxiliary contact of relay K92 will be closed to start the AC lubricating oil pump; after the AC lubricating oil pump is started, the lubricating oil pressure is greater than 40%, the auxiliary contact of relay K90 is closed, and the top shaft oil pump is started.

[0017] Furthermore, the AC lubricating oil pump and the top shaft oil pump are driven by a motor M.

[0018] The beneficial effects of the present invention are as follows: when the DCS controller is abnormal, the AC / DC oil pump is not in the automatic position or the DC oil pump two-position relay K45 is in the reset position, as long as the AC lubricating oil pump two-position relay K91 is in the set state, the AC lubricating oil pump is started, and after the AC lubricating oil pump is started, when the oil pressure is greater than 40%, the AC jacking oil pump is automatically started; this design guarantees the safety of the unit to the greatest extent, and prevents the AC lubricating oil pump and the jacking oil pump from being started when the control system fails and cannot send instructions, the control system loses power, etc., so that the unit can be safely idled down. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a first schematic diagram of an AC lubricating oil pump and a top shaft oil pump control system of the present invention;

[0020] Figure 2 A second schematic diagram of an AC lubricating oil pump and a top shaft oil pump control system of the present invention;

[0021] Figure 3 This is a third schematic diagram of an AC lubricating oil pump and a top shaft oil pump control system of the present invention.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 10. Command sending module; 20. Relay module; 30. Command execution and feedback module. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] like Figures 1 to 3 As shown, Embodiment 1 of the present invention is an AC lubricating oil pump and top shaft oil pump control system, comprising a command sending module 10, a relay module 20 and a command execution and feedback module 30;

[0026] The instruction sending module 10 is used to send instructions to the relay module 20;

[0027] The relay module 20 is used to complete the relay action under the control of the instruction sending module 10;

[0028] The instruction execution and feedback module 30 is used to display the state of the relay and start the AC lubricating oil pump and the top shaft oil pump after the relay is actuated.

[0029] During specific implementation, the instruction sending module 10 may be controlled by an operator or an engineer.

[0030] Embodiment 2 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 1, the relay module 20 includes a two-position relay K91, a relay K92, a relay K90, and a two-position relay K45.

[0031] Embodiment 3 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 2, the double-position relay K91 is a bistable key-locking relay. The setting signal of the double-position relay can only be reset by a reset instruction and is not affected by the power failure of the relay.

[0032] Embodiment 4 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 3, the instructions sent by the instruction sending module 10 include a double-position relay K91 reset instruction, a double-position relay K91 setting instruction, an AC lubricating oil pump and top shaft oil pump no tripping instruction, and a lubricating oil pressure greater than 40% instruction.

[0033] Embodiment 5 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 4, the AC lubricating oil pump and the top shaft oil pump have no tripping instructions, specifically including: the DCS controller is normal, the AC / DC lubricating oil pump is in automatic position, and the DC lubricating oil pump double-position relay K45 is in position.

[0034] Embodiment 6 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 5, the double-position relay K91 receives the setting and resetting instructions of the AC lubricating oil pump / top shaft oil pump. When receiving the setting instruction, the auxiliary contact of the double-position relay K91 closes, and the instruction execution and feedback module 30 displays that the double-position relay K91 has been set.

[0035] Embodiment 7 of the present invention is an AC lubricating oil pump and top shaft oil pump control system. Based on Embodiment 6, in the normal state of the steam turbine generator set, the auxiliary contact of relay K92 is disconnected and the AC lubricating oil pump is not started; when the two-position relay K91 is in the set state, if the DCS controller is abnormal or the AC or DC oil pump is not in the automatic position or the DC oil pump two-position relay K45 is in the reset position, the auxiliary contact of relay K92 will close to start the AC lubricating oil pump; after the AC lubricating oil pump is started, the lubricating oil pressure is greater than 40%, the auxiliary contact of relay K90 is closed, and the AC top shaft oil pump is started.

[0036] Embodiment 8 of the present invention is an AC lubricating oil pump and a top shaft oil pump control system. Based on Embodiment 7, the AC lubricating oil pump and the top shaft oil pump are driven by a motor M. The AC lubricating oil pump and the top shaft oil pump can be started by driving the motor M.

[0037] When the DCS controller is abnormal, the AC / DC oil pump is not in the automatic position or the DC oil pump two-position relay K45 is in the reset position, as long as the AC lubricating oil pump two-position relay K91 is in the set state, the AC lubricating oil pump will be started. After the AC lubricating oil pump is started, when the oil pressure is greater than 40%, the AC jacking oil pump will be automatically started; this design guarantees the safety of the unit to the greatest extent, and prevents the AC lubricating oil pump and the jacking oil pump from being started when the control system fails and cannot send instructions, the control system loses power, etc., so that the unit can be safely idled down.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An AC lubricating oil pump and top shaft oil pump control system, characterized in that: It comprises an instruction sending module (10), a relay module (20) and an instruction execution and feedback module (30); The instruction sending module (10) is used to send instructions to the relay module (20); The relay module (20) is used to complete the relay action under the control of the instruction sending module (10); The instruction execution and feedback module (30) is used to display the state of the relay and start the AC lubricating oil pump and the top shaft oil pump after the relay is actuated.

2. According to claim 1, an AC lubricating oil pump and top shaft oil pump control system is characterized in that: The relay module (20) comprises a two-position relay K91, a relay K92, a relay K90 and a two-position relay K45.

3. According to claim 2, an AC lubricating oil pump and top shaft oil pump control system is characterized in that: The two-position relay K91 is a bistable key-locking relay.

4. The AC lubricating oil pump and top shaft oil pump control system according to claim 3, characterized in that: The instructions sent by the instruction sending module (10) include a reset instruction for the double-position relay K91, a setting instruction for the double-position relay K91, an AC lubricating oil pump and a top shaft oil pump no tripping instruction, and an instruction for the lubricating oil pressure being greater than 40%.

5. The AC lubricating oil pump and top shaft oil pump control system according to claim 4, characterized in that: The AC lubricating oil pump and the top shaft oil pump have no tripping instructions specifically including: the DCS controller is normal, the AC / DC lubricating oil pump is in automatic position, and the DC lubricating oil pump double-position relay K45 is in position.

6. The AC lubricating oil pump and top shaft oil pump control system according to claim 5, characterized in that: The two-position relay K91 receives the setting and resetting instructions of the AC lubricating oil pump / jacking oil pump. When receiving the setting instruction, the auxiliary contact of the two-position relay K91 is closed, and the instruction execution and feedback module (30) displays that the two-position relay K91 has been set.

7. The AC lubricating oil pump and top shaft oil pump control system according to claim 6, characterized in that: In the normal state of the steam turbine generator set, the auxiliary contacts of relay K92 are disconnected and the AC lubricating oil pump is not started; when the two-position relay K91 is in the set state, if the DCS controller is abnormal or the AC or DC oil pump is not in the automatic position or the DC oil pump two-position relay K45 is in the reset position, the auxiliary contacts of relay K92 will be closed to start the AC lubricating oil pump; after the AC lubricating oil pump is started, the lubricating oil pressure is greater than 40%, and the auxiliary contacts of relay K90 are closed, thereby starting the top shaft oil pump.

8. The AC lubricating oil pump and top shaft oil pump control system according to claim 7, characterized in that: The AC lubricating oil pump and the top shaft oil pump are driven by a motor M.

Images