Auxiliary barring control system for steam turbine of nuclear power station

Abstract

The utility model relates to an auxiliary barring control system of a nuclear power station steam turbine, which comprises a barring control module and a switching module, the switching module is divided into a first switching module, a second switching module and a third switching module, and the barring control module comprises an uplink module and a downlink module. The third switching module is responsible for controlling the on-off of the uplink module and the downlink module so as to start and stop the turning device, and the first switching module and the second switching module are cooperatively and selectively connected with the turning device so as to control the turning device to move up or down. By means of the control, the number of cooperation times of operators is remarkably reduced, operation steps are simplified, delay and maintenance cost caused by human factors are reduced, and meanwhile operation safety and economical efficiency of a power plant are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant control, in particular to a nuclear power plant steam turbine auxiliary turning control system. Background Art

[0002] During the overhaul of steam turbine generator sets, center data measurement is a crucial link, which directly determines the accuracy of machine assembly. The acquisition of center data is achieved by operating the turning device. The traditional method requires the operator to manually control the turning device to start or stop the turning device, and to move up or down. This is not only a repetitive and tedious task, but also requires constant starting, stopping, and adjusting the running direction of the turning device. Such operations are not only tedious, but also may cause errors or delays due to improper human operation. Utility Model Content

[0003] The utility model provides a nuclear power plant steam turbine auxiliary cranking control system, which solves the problems of high labor intensity and frequent operation times during the on-site manual operation of steam turbine cranking by operators.

[0004] In order to solve the above technical problems, the utility model provides a nuclear power plant steam turbine auxiliary cranking control system, comprising a cranking control module and a switching module; the switching module comprises a first switching module, a second switching module and a third switching module connected in parallel, and the cranking control module comprises an uplink module and a downlink module connected in parallel;

[0005] The output ends of the uplink module and the downlink module are respectively connected to the turning device, and the input ends are connected to the third switching module, the first switching module is connected to the uplink module and the downlink module, and the second switching module is connected to the uplink module and the downlink module;

[0006] The third switching module starts and stops the turning device by controlling the on and off of the uplink module and the downlink module; the uplink module and the downlink module are selectively connected to the turning device through the first switching module and the second switching module to control the turning device to go up or down.

[0007] In one embodiment, a power supply module is further included, wherein the power supply module includes a first power supply and a second power supply;

[0008] The first power supply converts the external power supply into a first voltage to supply power to the cranking control module; the second power supply converts the external power supply into a second voltage to supply power to the switching module.

[0009] In one embodiment, the first switching module includes a first limit switch and a first intermediate relay, the first intermediate relay includes a first coil, a first node, a second node, and a third node, wherein the first node and the second node are normally open nodes, and the third node is a normally closed node;

[0010] One end of the first limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the first coil, and the first limit switch is also connected in parallel with the first node;

[0011] The second node is connected to the uplink module, and the third node is connected to the downlink module;

[0012] The first limit switch turns on the first coil according to the input upper limit signal, thereby triggering the first node and the second node to close and the third node to open.

[0013] In one embodiment, the downlink module includes a second solenoid valve and a second connector connected in series, and an output end of the second solenoid valve is connected to the turning device.

[0014] In one embodiment, the second switching module includes a second limit switch and a second intermediate relay, the second intermediate relay includes a second coil, a fourth node, a fifth node, and a sixth node, wherein the fourth node and the sixth node are normally open nodes, and the fifth node is a normally closed node;

[0015] One end of the second limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the second coil, and the second limit switch is also connected in parallel with the fourth node;

[0016] The fifth node is connected to the uplink module, and the sixth node is connected to the downlink module;

[0017] The second limit switch connects the second coil according to the input lower limit signal, thereby triggering the fourth node and the sixth node to close and the fifth node to open.

[0018] In one embodiment, the upward module includes a first solenoid valve and a first connector connected in series, and an output end of the first solenoid valve is connected to the turning device.

[0019] In one embodiment, the third switching module includes a starting switch and a third relay, and the third relay includes a third coil and a seventh node and an eighth node; wherein the starting switch, the seventh node and the eighth node are normally open nodes;

[0020] One end of the seventh node is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the third coil, and the seventh node is also connected in parallel with the start switch;

[0021] One end of the eighth node is connected to the positive input end of the turning control module, and the other end is connected to the input ends of the uplink module and the downlink module;

[0022] The starting switch triggers the seventh node and the eighth node to close by turning on the third coil, thereby starting the turning device.

[0023] In one embodiment, the third switching module includes a stop switch, which is connected in series between the positive input terminal of the switching module and the start switch; or connected in series between the start switch and the third coil; or connected in series between the third coil and the negative input terminal of the switching module.

[0024] In one embodiment, the switching module further includes an emergency stop switch, one end of which is connected to the positive input end of the turning control module, and the other end of which is connected to the input ends of the uplink module and the downlink module.

[0025] In an embodiment, the switching module further includes a power indicator light, one end of the power indicator light is connected to the positive input end of the switching module, and the other end of the power indicator light is connected to the negative input end of the switching module.

[0026] The implementation of the utility model has the following beneficial effects: the nuclear power plant steam turbine auxiliary cranking control system of the utility model is composed of a cranking control module and a switching module, wherein the switching module is subdivided into the first, second and third switching modules, and the cranking control module includes an up and down module. The third switching module is responsible for controlling the on and off of the up and down modules to realize the remote start and stop of the cranking equipment, while the first and second switching modules cooperate to selectively connect the cranking equipment to control it to move up or down. This control significantly reduces the number of operator coordination, simplifies the operating steps, reduces delays and maintenance costs caused by human factors, and enhances the operational safety and economy of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 It is a structural block diagram of the system of the turning gear control of the utility model;

[0029] Figure 2 It is the circuit principle diagram of the switching module of the utility model;

[0030] Figure 3This is a circuit diagram of the first embodiment of the power module of the utility model;

[0031] Figure 4 This is a circuit schematic diagram of the first embodiment of the three-in-one socket of the utility model;

[0032] Figure 5 This is a circuit schematic diagram of the first embodiment of the turning gear module of the utility model;

[0033] Figure 6 It is a circuit schematic diagram of the first embodiment of the terminal block of the utility model;

[0034] Figure 7 This is a circuit diagram of the first embodiment of the aviation plug of the utility model. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "connection", "fixation", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, thus, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. can explicitly or implicitly include one or more of the features. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0037] like Figure 1As shown, the utility model provides an embodiment of a system for auxiliary turning gear control of a nuclear power plant steam turbine, including a turning gear control module and a switching module; the switching module includes a first switching module, a second switching module and a third switching module connected in parallel, and the turning gear control module includes an uplink module and a downlink module connected in parallel; the output ends of the uplink module and the downlink module are respectively connected to the turning gear device, and the input ends are connected to the third switching module, the first switching module is connected to the uplink module and the downlink module, and the second switching module is connected to the uplink module and the downlink module; the third switching module starts and stops the turning gear device by controlling the on and off of the uplink module and the downlink module; the uplink module and the downlink module are selectively connected to the turning gear device through the first switching module and the second switching module, and control the turning gear device to go up or down. Further, the switching module also includes a power indicator light, one end of the power indicator light is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module.

[0038] like Figure 2 As shown, specifically: the power indicator light is an LED indicator light, one end of which is connected to the positive input terminal of the switching module, and the other end is connected to the negative input terminal thereof, thereby forming a complete circuit loop. Specifically, the function of the LED power indicator light is to display the power status of the switching module in real time, thereby providing the operator with an intuitive and immediate visual feedback to ensure the safety and effectiveness of the operation.

[0039] like Figure 3 As shown, further, the nuclear power plant steam turbine auxiliary cranking control system also includes a power supply module, and the power supply module includes a first power supply U1 and a second power supply U2;

[0040] like Figure 4 As shown, the first power supply U1 converts the external power supply into a first voltage to power the cranking control module; the second power supply U2 converts the external power supply into a second voltage to power the switching module. The power module also includes a three-in-one socket 001BN, which is connected between the external 220VAC power supply and the first power supply and the second power supply. When the three-in-one socket 001BN is closed, the power indicator light 003LA lights up immediately, clearly indicating that the power supply has been closed and is in working condition. The first power supply converts 220V AC into 24V DC to power the switching module; the second power supply U2 converts 220V AC into 48V DC to power the cranking module, ensuring that they can work stably and reliably.

[0041] like Figure 5As shown, further, the first switching module includes a first limit switch LS1 (as an upper limit switch), a first intermediate relay 001UM, and the first intermediate relay includes a first coil, a first node 1, a second node 2, and a third node 3, wherein the first node 1 and the second node 2 are normally open nodes, and the third node 3 is a normally closed node; one end of the first limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the first coil, and the first limit switch is also connected in parallel with the first node 1; the second node 2 is connected to the uplink module, and the third node 3 is connected to the downlink module; the first limit switch connects the first coil according to the input upper limit signal, thereby triggering the first node 1 and the second node 2 to close and the third node 3 to open. In another embodiment, the first switching module also includes a first indicator light 001LA, and the first indicator light is connected in parallel with the first coil of the first intermediate relay.

[0042] The intermediate relay effectively expands the control capacity in this system, so that a larger load can be driven by a smaller control signal, thereby protecting the electrical equipment from damage caused by excessive load. Its contacts have good load-carrying capacity, which improves the accuracy and safety of control. More importantly, the application of the intermediate relay simplifies the subsequent maintenance process and improves the maintainability and reliability of the entire system.

[0043] When the turning device is not running, the second switching module and the third module are in the disconnected state, and the first limit switch LS1 is in the closed state after receiving the upper limit signal, so that the coil of the first intermediate relay 001UM is energized, the first indicator light 001LA lights up, and the first node 1 (normally open node) is closed at the same time to ensure that 001UM is continuously energized, and its second node 2 (normally open node) also remains in the closed state, ready to receive and respond to the start command.

[0044] Further, the second switching module includes a second limit switch and a second intermediate relay, the second intermediate relay includes a second coil, a fourth node 4, a fifth node 5, and a sixth node 6, wherein the fourth node 4 and the sixth node are normally open nodes, and the fifth node 5 is a normally closed node; one end of the second limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the second coil, and the second limit switch is also connected in parallel with the fourth node 4; the fifth node 5 is connected to the uplink module, and the sixth node 6 is connected to the downlink module; the second limit switch connects the second coil according to the input lower limit signal, thereby triggering the fourth node 4 and the sixth node 6 to close and the fifth node 5 to open. Further, the second switching module also includes a second indicator light 002LA, and the second indicator light is connected in parallel with the second intermediate relay coil.

[0045] Specifically, when the system receives the lower limit signal, the second limit switch LS2 is closed. This action energizes the second coil, thereby triggering the second intermediate relay 002UM to be energized. As 002UM is energized, the second indicator light 002LA lights up, providing the operator with immediate visual feedback. After 002UM is energized, its built-in third node 3 (normally open node) is closed, and at the same time, the fifth node 5 (normally open node) is also closed, while the fourth node 4 (normally closed node) is disconnected. The disconnection of the fourth node 4 (normally closed node) causes the first solenoid valve 001EV connected to the upstream module to lose power, thereby cutting off the instruction path for continuing to move upward; and the closure of the normally open node causes the second solenoid valve 002EV connected to the downstream module to be energized, starting the downward operation.

[0046] In this embodiment, the downlink module includes a second solenoid valve and a second connector connected in series, and the output end of the second solenoid valve is connected to the turning device. The uplink module includes a first solenoid valve and a first connector connected in series, and the output end of the first solenoid valve is connected to the turning device. Specifically, Figure 7 As shown, the second connector is integrated with the first connector, for example, a dual-channel aviation plug connector 003BN is used. Of course, the second connector and the first connector can also use an aviation plug connector respectively.

[0047] Furthermore, the first limit switch LS1 and the second limit switch LS2 are connected to the Figure 6 The terminal block 002BN shown is connected to receive the upper limit signal and the lower limit signal respectively.

[0048] This embodiment uses 1.5mm 2 and 2.5mm 2 The control cables of the specifications are characterized by low smoke and low halogen, as well as effective flame retardant ability, which improves the safety of the system. In addition, its excellent anti-interference performance ensures the accuracy and stability of signal transmission and meets the needs of complex electrical control environments. Terminal block 002BN serves as the signal convergence point. When terminal block 002BN receives the upper limit signal, LS1 is closed, and when terminal block 002BN receives the lower limit signal, LS2 is closed. Dual monitoring of the position or status of the equipment is realized. Terminal block 003BN is responsible for the distribution and transmission of control signals. One end is connected to the first solenoid valve, and the other end is connected to the second solenoid valve, ensuring that the control instructions can be accurately conveyed to the corresponding actuators, realizing precise control of the movement of the equipment.

[0049] Furthermore, the third switching module includes a starting switch and a third relay, and the third relay includes a third coil and a seventh node 7 and an eighth node 8; wherein the starting switch, the seventh node 7 and the eighth node 8 are normally open nodes; one end of the seventh node 7 is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the third coil, and the seventh node 7 is also connected in parallel with the starting switch; one end of the eighth node 8 is connected to the positive input end of the turning gear control module, and the other end is connected to the input ends of the uplink module and the downlink module; the starting switch triggers the closure of the seventh node 7 and the eighth node 8 by connecting the third coil, thereby starting the turning gear device.

[0050] Specifically, when the switch 001TO is started, the third coil of the third relay 003UM is energized. As the 003UM coil is energized, its built-in seventh node 7 (normally open power saving) is immediately closed, and 003UM can also remain energized. At the same time, the eighth node 8 (normally open node) of 003UM is also closed, causing the first solenoid valve 001EV connected to the upstream module to be energized. The energization of the first solenoid valve 001EV causes the device to start moving toward the upper limit.

[0051] Furthermore, the third switching module includes a stop switch, which is connected in series between the positive input terminal of the switching module and the start switch; or connected in series between the start switch and the third coil; or connected in series between the third coil and the negative input terminal of the switching module.

[0052] In one embodiment: the stop switch 002TO is located between the positive input terminal of the switching module and the start switch 001TO. When the stop switch 002TO is closed, the circuit is disconnected, causing the entire switching module (including the start switch and the third relay) to lose power. Therefore, the third intermediate relay 003UM will also lose power, and its seventh node 7 (normally open node) will be disconnected due to power loss. Since the first solenoid valve 001EV and the second solenoid valve 002EV both rely on the power provided by this node, they will also lose power, eventually causing the device to stop running.

[0053] In another embodiment: the stop switch 002TO is located between the start switch 001TO and the third coil of the third relay 003UM. When the stop switch 002TO is pressed, although the positive input terminal of the switching module is still powered, the circuit from the start switch to the third coil is cut off. Therefore, the third relay 003UM cannot be powered, and the seventh node 7 (normally open node) of its 48V circuit remains disconnected. Similarly, the first solenoid valve and the second solenoid valve stop working due to the loss of power, and the device stops running immediately.

[0054] In another embodiment, the stop switch 002TO is located between the third coil of the third relay 003UM and the negative input terminal of the switching module. Pressing the stop switch 002TO will cut off the negative connection of the third coil, causing the third relay 003UM to lose power. The subsequent results are the same as the previous two solutions: the seventh node 7 (normally open node) of the 48V loop is disconnected, the first solenoid valve and the second solenoid valve lose power, and the device stops running.

[0055] Furthermore, the switching module also includes an emergency stop switch, one end of which is connected to the positive input end of the turning gear control module, and the other end of which is connected to the input ends of the uplink module and the downlink module.

[0056] Specifically, the emergency stop switch ES1 includes at least one normally closed node. This is because under normal conditions, the node is closed, allowing current to pass through to maintain the power-on state of the solenoid valve, thereby maintaining the normal operation of the equipment. However, once an emergency occurs, the emergency stop switch ES1 is operated, and the normally closed node will be quickly disconnected, thereby cutting off the power output to the solenoid valve (001EV and 002EV). With the power supply of the solenoid valve cut off, both the upstream module and the downstream module will not be able to continue to perform the action due to the loss of driving power, so the turning device will stop running immediately. This rapid and effective cut-off mechanism is crucial to preventing the accident from expanding and protecting operators and equipment from further damage.

[0057] The utility model of the nuclear power plant steam turbine auxiliary cranking control system is composed of a cranking control module and a switching module, wherein the switching module is subdivided into the first, second and third switching modules, and the cranking control module includes an upward and downward module. The third switching module is responsible for controlling the on and off of the upward and downward modules to realize the start and stop of the cranking equipment, while the first and second switching modules cooperate to selectively connect the cranking equipment to control it to move upward or downward. This control significantly reduces the number of times the operator cooperates and simplifies the operating steps, thereby improving the measurement efficiency and shortening the overhaul period. In addition, the realization of the remote start and stop function not only improves work efficiency, but also reduces delays and maintenance costs caused by human factors, while enhancing the operating safety and economy of the power plant.

[0058] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A nuclear power plant steam turbine auxiliary cranking control system, characterized in that: It includes a cranking control module and a switching module; the switching module includes a first switching module, a second switching module and a third switching module connected in parallel, and the cranking control module includes an uplink module and a downlink module connected in parallel; The output ends of the uplink module and the downlink module are respectively connected to the turning device, and the input ends are connected to the third switching module, the first switching module is connected to the uplink module and the downlink module, and the second switching module is connected to the uplink module and the downlink module; The third switching module starts and stops the turning device by controlling the on and off of the uplink module and the downlink module; the uplink module and the downlink module are selectively connected to the turning device through the first switching module and the second switching module to control the turning device to go up or down.

2. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: Also includes a power supply module, the power supply module includes a first power supply and a second power supply; The first power supply converts the external power supply into a first voltage to supply power to the cranking control module; the second power supply converts the external power supply into a second voltage to supply power to the switching module.

3. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The first switching module includes a first limit switch and a first intermediate relay, the first intermediate relay includes a first coil, a first node, a second node, and a third node, wherein the first node and the second node are normally open nodes, and the third node is a normally closed node; One end of the first limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the first coil, and the first limit switch is also connected in parallel with the first node; The second node is connected to the uplink module, and the third node is connected to the downlink module; The first limit switch turns on the first coil according to the input upper limit signal, thereby triggering the first node and the second node to close and the third node to open.

4. The system for auxiliary turning control of a nuclear power plant steam turbine according to claim 1, characterized in that: The downlink module comprises a second solenoid valve and a second connector connected in series, and an output end of the second solenoid valve is connected to the turning device.

5. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The second switching module includes a second limit switch and a second intermediate relay, the second intermediate relay includes a second coil, a fourth node, a fifth node, and a sixth node, wherein the fourth node and the sixth node are normally open nodes, and the fifth node is a normally closed node; One end of the second limit switch is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the second coil, and the second limit switch is also connected in parallel with the fourth node; The fifth node is connected to the uplink module, and the sixth node is connected to the downlink module; The second limit switch connects the second coil according to the input lower limit signal, thereby triggering the fourth node and the sixth node to close and the fifth node to open.

6. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The upward module includes a first solenoid valve and a first connector connected in series, and an output end of the first solenoid valve is connected to the turning device.

7. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The third switching module includes a starting switch and a third relay, and the third relay includes a third coil and a seventh node and an eighth node; wherein the starting switch, the seventh node and the eighth node are normally open nodes; One end of the seventh node is connected to the positive input end of the switching module, and the other end is connected to the negative input end of the switching module through the third coil, and the seventh node is also connected in parallel with the start switch; One end of the eighth node is connected to the positive input end of the turning control module, and the other end is connected to the input ends of the uplink module and the downlink module; The starting switch triggers the seventh node and the eighth node to close by turning on the third coil, thereby starting the turning device.

8. The nuclear power plant steam turbine auxiliary cranking control system according to claim 7, characterized in that: The third switching module includes a stop switch, which is connected in series between the positive input terminal of the switching module and the start switch; or in series between the start switch and the third coil; or in series between the third coil and the negative input terminal of the switching module.

9. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The switching module further comprises an emergency stop switch, one end of which is connected to the positive input end of the turning control module, and the other end of which is connected to the input ends of the uplink module and the downlink module.

10. The nuclear power plant steam turbine auxiliary cranking control system according to claim 1, characterized in that: The switching module also includes a power indicator light, one end of which is connected to the positive input end of the switching module, and the other end of which is connected to the negative input end of the switching module.

Images