Steam turbine rotor starting device with buffering function

Abstract

The utility model discloses a steam turbine rotor starting device with a buffering function, and relates to the technical field of steam turbine control, the steam turbine rotor starting device comprises a power supply, an emergency loop unit, a soft start loop unit, an operation unit, a soft start bypass unit and a fault unit; the power source is connected with the emergency loop unit, one end of the emergency loop unit is connected to the soft start loop unit and used for controlling a steam turbine rotor to conduct soft start, the output end of the operation unit is connected with the power source, the soft start bypass unit is connected with the soft start loop unit in parallel, and the fault unit is connected with the power source in parallel. The reliability and the service life of equipment can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine control, in particular to a steam turbine rotor starting device with a buffering function. Background Art

[0002] The turbine turning device keeps the rotor at a certain speed after the turbine is shut down to ensure uniform cooling of the rotor and avoid bending and deformation of the rotor. It can also be used for impulse before starting to check whether there are abnormal conditions such as friction and collision between the moving and static parts of the turbine. Therefore, it is an important auxiliary device for the steam turbine. However, the current turbine turning device needs to be manually operated to start and stop, which increases the safety risk of the operator and cannot achieve automatic control. Utility Model Content

[0003] The embodiment of the present application solves the technical problem that is difficult to control in the prior art by providing a steam turbine rotor starting device with a buffering function.

[0004] The embodiment of the present application provides a steam turbine rotor starting device with a buffering function, comprising:

[0005] Power supply, emergency circuit unit, soft start circuit unit, operation unit, soft start bypass unit and fault unit; the power supply is connected to the emergency circuit unit, one end of the emergency circuit unit is connected to the soft start circuit unit for controlling the steam turbine rotor for soft start, the output end of the operation unit is connected to the power supply, the soft start bypass unit is connected in parallel with the soft start circuit unit, and the fault unit is connected in parallel with the power supply.

[0006] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0007] Through the design of the soft start circuit unit and the soft start bypass unit, the soft start of the turbine rotor is achieved, which effectively reduces the impact on the system during startup and improves the reliability and service life of the equipment.

[0008] The emergency circuit unit in the device allows emergency starting of the steam turbine through the emergency starting switch and related relays when the conventional power supply or main circuit fails, enhancing the emergency response capability of the system.

[0009] The design of the fault unit enables the device to give a fault indication in time through indicator lights or other signal devices when a fault occurs, so that the operator can quickly locate and handle the fault while protecting the equipment from further damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a structural schematic diagram of a steam turbine rotor starting device with a buffering function.

[0011] Figure 2 The utility model is a structural schematic diagram of a first soft start switching device of a steam turbine rotor starting device with a buffering function.

[0012] Figure 3 The utility model is a structural schematic diagram of an emergency circuit unit of a steam turbine rotor starting device with a buffering function.

[0013] Figure 4 The utility model is a structural schematic diagram of a soft start circuit unit of a steam turbine rotor starting device with a buffering function.

[0014] Figure 5 The utility model is a structural schematic diagram of an operating unit of a steam turbine rotor starting device with a buffering function.

[0015] Figure 6 The utility model is a structural schematic diagram of a soft start bypass unit of a steam turbine rotor starting device with a buffering function.

[0016] Figure 7 The utility model is a structural schematic diagram of a fault unit of a steam turbine rotor starting device with a buffering function.

[0017] In the figure: 1. first soft start switching device; 2. first intermediate relay; 3. thermal relay; 4. indicator light; 5. emergency start switch; 6. second intermediate relay; 7. second soft start switching device; 8. soft start switch; 9. current relay; 10. third intermediate relay; 11. three-phase indicator light; 101. mutual inductor; 102. bypass contactor; 103. emergency AC contactor; 104. soft start control chip; 105. motor; 106. terminal block; 107. thermal overload appliance; 108. isolating switch. DETAILED DESCRIPTION

[0018] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0019] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific implementation methods and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] like Figure 1 As shown, the present application provides a steam turbine rotor starting device with a buffering function, comprising:

[0022] Power supply, emergency circuit unit, soft start circuit unit, operation unit, soft start bypass unit and fault unit; the power supply is connected to the emergency circuit unit, one end of the emergency circuit unit is connected to the soft start circuit unit for controlling the steam turbine rotor for soft start, the output end of the operation unit is connected to the power supply, the soft start bypass unit is connected in parallel with the soft start circuit unit, and the fault unit is connected in parallel with the power supply.

[0023] like Figure 3-Figure 7 As shown, the emergency circuit unit includes a first soft start switching device 1 connected in series with the circuit, the first soft start switching device 1 is connected in series with an emergency start switch 5, the emergency start switch 5 is connected in series with a first intermediate relay 2, the input end of the emergency start switch 5 is connected in parallel with a second intermediate relay 6, the second intermediate relay 6 is connected with an indicator light 4, and the first intermediate relay 2 is connected in series with a thermal relay 3.

[0024] Preferably, one end of the soft start circuit unit is connected in series with the first soft start switching device 1. When soft start is allowed, it can be directly started through the first soft start switching device 1, and the first soft start switching device 1 is connected to the emergency circuit unit so that the corresponding problem can be avoided in time when the corresponding situation occurs; the soft start circuit unit includes a second soft start switching device 7 connected to the first soft start switching device 1, and one end of the second soft start switching device 7 is connected to a soft start switch 8.

[0025] Preferably, the operating unit includes a current relay 9 and an indicator light 4 .

[0026] Preferably, the soft start bypass unit includes a current relay 9 and a third intermediate relay 10 .

[0027] Preferably, the fault unit includes two current relays 9 and a three-phase indicator light 11 .

[0028] Preferably, Figure 2As shown, the first soft start switching device 1 includes a mutual inductor 101, a bypass contactor 102, an emergency AC contactor 103, a soft start control chip 104, a motor 105, and a terminal 106; the mutual inductor 101 is electrically connected to the input end of the soft start control chip 104, the output end of the soft start control chip 104 is electrically connected to the terminal 106, the terminal 106 is electrically connected to the motor 105, the bypass contactor 102 and the emergency AC contactor 103 are connected in parallel on both sides of the soft start control chip 104, and the emergency AC contactor 103 is electrically connected to the thermal overload device 107 and the isolating switch 108 in sequence.

[0029] When soft start is required, the emergency circuit unit can be connected to the soft start circuit unit through the first soft start switching device 1, so as to control the turbine rotor for soft start; when soft start is allowed, the starting process can be controlled by the second soft start switching device 7 and the soft start switch 8 to achieve soft start.

[0030] The transformer 101 is used to detect current or voltage signals and transmit these signals to the soft start control chip 104; the soft start control chip 104 controls the starting process of the motor 105 according to the received signal to achieve soft starting; the bypass contactor 102 and the emergency AC contactor 103 provide different circuit paths to cope with different operating requirements or fault conditions; at the initial start-up, the soft start control chip 104 will control the motor 105 to start running at a lower speed and current to reduce the impact on the power grid and mechanical system; as the motor accelerates, the soft start control chip 104 will gradually increase the speed and current of the motor until it reaches a normal operating state; if any abnormality is detected during the startup process (such as overload, short circuit, etc.), the soft start control chip 104 will immediately cut off the power supply to protect the motor and other equipment.

[0031] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steam turbine rotor starting device with a buffering function, characterized in that: include: Power supply, emergency circuit unit, soft start circuit unit, operation unit, soft start bypass unit and fault unit; the power supply is connected to the emergency circuit unit, one end of the emergency circuit unit is connected to the soft start circuit unit for controlling the steam turbine rotor for soft start, the output end of the operation unit is connected to the power supply, the soft start bypass unit is connected in parallel with the soft start circuit unit, and the fault unit is connected in parallel with the power supply.

2. A steam turbine rotor starting device with a buffering function as claimed in claim 1, characterized in that: The emergency circuit unit comprises a first soft start switching device (1) connected in series with the circuit, the first soft start switching device (1) is connected in series with an emergency start switch (5), the emergency start switch (5) is connected in series with a first intermediate relay (2), the input end of the emergency start switch (5) is connected in parallel with a second intermediate relay (6), the second intermediate relay (6) is connected with an indicator light (4), and the first intermediate relay (2) is connected in series with a thermal relay (3).

3. A steam turbine rotor starting device with a buffering function as claimed in claim 2, characterized in that: One end of the soft start circuit unit is connected in series with the first soft start switching device (1), and the soft start circuit unit also includes a second soft start switching device (7) connected to the first soft start switching device (1), and one end of the second soft start switching device (7) is connected to a soft start switch (8).

4. A steam turbine rotor starting device with a buffering function as claimed in claim 2, characterized in that: The operating unit comprises a current relay (9) and an indicator light (4).

5. A steam turbine rotor starting device with a buffering function as claimed in claim 4, characterized in that: The soft start bypass unit comprises a current relay (9) and a third intermediate relay (10).

6. A steam turbine rotor starting device with a buffering function as claimed in claim 4, characterized in that: The fault unit comprises two current relays (9) and a three-phase indicator light (11).

7. A steam turbine rotor starting device with a buffering function as claimed in claim 2, characterized in that: The first soft start switching device (1) comprises a mutual inductor (101), a bypass contactor (102), an emergency AC contactor (103), a soft start control chip (104), a motor (105), and a connection terminal (106); the mutual inductor (101) is electrically connected to an input end of the soft start control chip (104), the output end of the soft start control chip (104) is electrically connected to the connection terminal (106), the connection terminal (106) is electrically connected to the motor (105), the bypass contactor (102) and the emergency AC contactor (103) are connected in parallel on both sides of the soft start control chip (104), and the emergency AC contactor (103) is electrically connected in sequence to a thermal overload device (107) and an isolating switch (108).

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