A starting control device for a nuclear safety class diesel engine twin motor starting

Abstract

The application provides a starting control device for nuclear safety class diesel engine double-motor starting, which comprises a main motor M1 and a standby motor M2, an intermediate relay K002, a pulse relay K003, an intermediate relay K004, a main repeated starting relay K01 and a secondary repeated starting relay K02. The application can realize the sequential switching of the main motor and the standby motor by only repeatedly sending a starting signal of a diesel engine control system, and can realize the repeated starting function and avoid the meshing failure of an output gear through the discharge of a capacitor to realize control and time delay.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of diesel engine standby starting, in particular to a starting control device for nuclear safety class diesel engine double motor starting. BACKGROUND

[0002] The diesel generator set is generally a standby unit, and most of the time when starting, the power supply is lost, and the peripheral equipment is limited in operation. In order to ensure the reliability of starting, the battery is generally used to drive the electric motor to drag the diesel engine to reach the ignition speed. The nuclear safety class diesel engine has higher safety level, and puts forward more stringent requirements for the reliable and stable operation of the unit. It is usually required to have a redundant starting function, that is, after one starting mode fails, it can quickly switch to another starting mode for starting, to ensure the smooth starting of the diesel unit for power supply.

[0003] The existing diesel unit starting control mode has the following disadvantages: 1. The meshing process may fail, and the output pinion may not be correctly and completely meshed with the flywheel, and forced starting may cause the motor pinion to be toothed; 2. Double motor switching needs to increase a switching control circuit in order to switch to the standby motor for starting when the main motor fails to start. SUMMARY

[0004] In view of the problems in the prior art, the present application provides the following technical scheme:

[0005] A starting control device for nuclear safety class diesel engine double motor starting, comprising a main motor M1, a standby motor M2, a diesel engine control system, an intermediate relay K002, a pulse relay K003, an intermediate relay K004, a main repeated starting relay K01 and a vice repeated starting relay K02;

[0006] The coil of the intermediate relay K002 is connected between the positive and negative poles of the diesel engine starting signal input control end of the diesel engine control system, and the coil of the intermediate relay K004 is connected between the positive and negative poles of the starting device control end of the diesel engine control system;

[0007] The common contact 30 of the intermediate relay K002 is connected with the normally open contact 87 of the intermediate relay K004, and the normally closed contact 87a of the intermediate relay K002 is suspended;

[0008] The normally open contact 87 of the intermediate relay K002 is connected with the A1 end of the coil of the pulse relay K003, the normally open group contact 1 end of the pulse relay K003, and the normally closed group contact 5 end of the pulse relay K003, respectively, the normally open group contact 2 end of the pulse relay K003 is connected with the 50g end of the main repeated starting relay K01, and the normally closed group contact 6 end of the pulse relay K003 is connected with the 50g end of the vice repeated starting relay K02;

[0009] A2 end of coil of pulse relay K003 is connected to negative pole of battery power supply;

[0010] common contact 30 of intermediate relay K004 is connected to positive pole of battery power supply after passing through fuse F001; normally closed contact 87a of intermediate relay K004 is suspended;

[0011] positive pole of battery power supply is also connected to 30 terminal of main motor M1 and standby motor M2 respectively;

[0012] negative pole of battery power supply is also connected to 31 terminal of main motor M1 and standby motor M2, 31 terminal of main repeat starting relay K01 and auxiliary repeat starting relay K02 respectively;

[0013] 50 terminal of main motor M1 is connected to 50h terminal of main repeat starting relay K01;

[0014] 48 terminal of main motor M1 is connected to 48 terminal of main repeat starting relay K01;

[0015] 50 terminal of standby motor M2 is connected to 50h terminal of auxiliary repeat starting relay K02;

[0016] 48 terminal of standby motor M2 is connected to 48 terminal of auxiliary repeat starting relay K02.

[0017] Further, main repeat starting relay K01 and auxiliary repeat starting relay K02 are same in structure, both of which include two coils: coil LA and coil LB, each of which controls one contact, wherein coil LA controls normally open contact and coil LB controls normally closed contact;

[0018] wherein 31 terminal is connected to one end of coil LA, the other end of coil LA is connected to one end of coil LB and one end of normally closed contact respectively, the other end of normally closed contact LB is connected to one end of normally open contact LA and 50g terminal respectively, the other end of normally open contact LA is connected to 50h terminal; coil LB is connected in parallel with capacitor C1, and the other end of coil LB is connected to anode of diode D1, cathode of diode D1 is connected to 48 terminal.

[0019] Further, the battery power supply is 24V battery pack.

[0020] Further, the model of intermediate relay K002 is Changtai JD2914F.

[0021] Further, the model of pulse relay K003 is ABB E290-16-11+E292-16-11.

[0022] Further, the model of intermediate relay K004 is Changtai JD2914F.

[0023] The present application only needs to repeatedly send starting signals to realize the sequential switching of the main motor and the standby motor; the control and delay are realized by capacitor discharge, so that the repeated starting function is realized and the meshing failure of the output gear is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and serve to explain the principles of the present application. It is to be understood that other related drawings can be obtained from these drawings by a person of ordinary skill in the art without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the circuit structure of the present application;

[0026] Figure 2 It is a working timing diagram of the starting control device. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] The output gear of the starting motor generally adopts a rotary meshing mode. When the starting motor receives a starting signal, the secondary meshing relay first acts to rotate and extend the output gear to mesh with the flywheel of the diesel engine. When the output gear is meshed in place, the starting motor main output relay is turned on to make the starting motor main coil start to act to drive the diesel engine to rotate. When the diesel engine reaches the ignition speed, the atomized diesel oil in the cylinder is compressed and ignited, and the speed rapidly rises. At this time, the starting signal to the motor is withdrawn, the motor is powered off, and the output gear is retracted by the spring force and separated from the diesel engine, and the starting process is completed. According to the above starting process, the control circuit of the dual-motor starting control device of the present application is designed.

[0029] The present application mainly designs a dual-motor switching circuit, which utilizes the feature that the pulse relay maintains the original state after pulse switching to realize the circuit switching of the dual-motor.

[0030] The 48th terminal of the starting motor involved in the present application is at a high voltage of 24V when the main coil of the motor normally outputs; and is at a low voltage of 0V when the pinion is not meshed and the main coil of the starting motor is not turned on. The state of the 48th terminal can be detected to control the starting motor to start repeatedly.

[0031] As Figure 1As shown, a nuclear safety class diesel engine double motor starting starting control device, including the main motor M1 and standby motor M2, and diesel engine control system, intermediate relay K002, pulse relay K003, intermediate relay K004, main repeated starting relay K01 and vice repeated starting relay K02;

[0032] The diesel engine control system is responsible for providing control input signals and 1 diesel engine starting signal to the starting control device.

[0033] The positive and negative poles of the diesel engine starting signal input control end of the diesel engine control system are connected to the coil of the intermediate relay K002, which is used to control the diesel engine starting signal input; the positive and negative poles of the circuit power supply control end of the diesel engine control system are connected to the coil of the intermediate relay K004, which is used to control the starting device function.

[0034] The common contact 30 of the intermediate relay K002 is connected to the normally open contact 87 of the intermediate relay K004, which introduces the 24V high potential of the battery, and is used to control the K003 coil action and provide starting control power. The normally closed contact 87a of the intermediate relay K002 is suspended.

[0035] The normally open contact 87 of the intermediate relay K002 is connected to the A1 end of the coil of the pulse relay K003, the normally open group contact 1 end of the pulse relay K003, and the normally closed group contact 5 end of the pulse relay K003, respectively. The normally open group contact 2 end of the pulse relay K003 is connected to the 50g end of the main repeated starting relay K01, and the normally closed group contact 6 end of the pulse relay K003 is connected to the 50g end of the vice repeated starting relay K02; The power signal connected to the K003 coil is used to control the switching of the normally open and closed group contacts of the pulse relay when the diesel engine starting signal is input; The signals connected to the normally open and closed group contacts are respectively the starting signals of the repeated starting relays K01 and K02, which are used to control the action of the starting motor.

[0036] The A2 end of the coil of the pulse relay K003 is connected to the negative pole of the battery power supply, and forms a loop with the A1 connected to the normally open contact 87 of the intermediate relay K002, to realize the control function;

[0037] The common contact 30 of the intermediate relay K004 is connected to the positive pole of the battery power supply after passing through the fuse F001, which is used to input power to the starting action loop. The normally closed contact 87a of the intermediate relay K004 is suspended.

[0038] The positive pole of the battery power supply is also connected to the 30 terminal of the main motor M1 and the standby motor M2, respectively, to provide starting current for the starting motor main coil, and is also connected to the common contact 30 of the intermediate relay K004 through the fuse F001, to provide control current for the starting control device.

[0039] The negative pole of the battery power supply is also connected with the 31 end of the main motor M1 and the standby motor M2, the 31 end of the main repeated starting relay K01 and the auxiliary repeated starting relay K02, the negative pole of the starting motor main coil supply loop, and the coil terminal A2 of the pulse relay K003, thereby providing the negative pole of the K003 control coil.

[0040] The normally open contact of the pulse relay K003 is connected with the normally open contact of the relay K002 and the 50g terminal of the repeated starting relay K01, thereby providing a starting signal for the main starting motor.

[0041] The normally closed contact of the pulse relay K003 is connected with the normally open contact of the relay K002 and the 50g terminal of the repeated starting relay K02, thereby providing a starting signal for the standby starting motor.

[0042] The 50 end of the main motor M1 is connected with the 50h end of the main repeated starting relay K01, thereby receiving a starting command signal of the starting control system.

[0043] The 48 end of the main motor M1 is connected with the 48 end of the main repeated starting relay K01, thereby feeding back the M1 motor state and controlling the main repeated starting relay K01 to realize the repeated starting function.

[0044] The 50 end of the standby motor M2 is connected with the 50h end of the auxiliary repeated starting relay K02, thereby receiving a starting command signal of the starting control system.

[0045] The 48 end of the standby motor M2 is connected with the 48 end of the auxiliary repeated starting relay K02, thereby feeding back the M2 motor state and controlling the auxiliary repeated starting relay K02 to realize the repeated starting function.

[0046] The circuit of the application comprises two repeated starting relays for repeated starting: the main repeated starting relay K01 and the auxiliary repeated starting relay K02. Figure 1 Taking the main repeated starting relay K01 in the circuit as an example: the repeated starting relay has four ports: the 50h end, the 48 end, the 31 end and the 50g end, two coils: the coil LA and the coil LB, each coil controls one contact, wherein the coil LA controls the normally open contact and the coil LB controls the normally closed contact; one charge and discharge capacitor C1 and one protection diode.

[0047] The 31 end is connected with one end of the coil LA, the other end of the coil LA is electrically connected with one end of the coil LB and one end of the normally closed contact, the other end of the normally closed contact is connected with one end of the normally open contact and the 50g end, the other end of the normally open contact is connected with the 50h end; the coil LB is connected in parallel with the capacitor C1, the other end of the coil LB is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the 48 end.

[0048] The application controls the charging and discharging time by selecting the proper capacity of C1 capacitor in the repeated starting relay, and realizes the repeated starting of the same motor in the time of the output starting signal of the control system. If the starting is not successful in the specified time, the control system disconnects the starting signal and delays the output of the starting signal, and at this time the starting control device automatically switches to the standby motor for starting.

[0049] Further, the battery power supply is a 24V battery pack.

[0050] Further, the intermediate relay K002 is of the model of Changtai JD2914F.

[0051] Further, the pulse relay K003 is of the model of ABB E290-16-11+E292-16-11.

[0052] Further, the intermediate relay K004 is of the model of Changtai JD2914F.

[0053] Working principle:

[0054] Regarding the switching of the main and standby motors, the application fully utilizes the functional characteristics of the pulse relay K003 for switching. Specifically, first, the diesel engine control system detects whether the current diesel engine has the starting state, and when there is no alarm or fault affecting the starting, the diesel engine control system outputs the control signal to the starting device, at this time the intermediate relay K004 acts (the common contact 30 of K004 is connected with the normally open contact 87); when the diesel engine control system starts the diesel engine and inputs the diesel engine starting signal, the intermediate relay K002 acts (the common contact 30 thereof is connected with the normally open contact 87); the coil A1 terminal of the pulse relay K003 is powered through the normally open contact 87 of K002, at this time the coil acts, the normally open contact group 1, 2 of the pulse relay K003 is switched to the closed state, the control circuit of the main motor M1 is connected, and the normally closed contact group 5, 6 of the pulse relay K003 is switched to the open state, the control circuit of the standby motor M2 is disconnected. When the delay time of the starting signal control input arrives and the diesel engine is still not started, the diesel engine control system disconnects the output of the starting signal, at this time the coil of the intermediate relay K002 is powered off, the common contact 30 of the intermediate relay K002 is disconnected from the normally open contact 87 and switched to the connection with the normally closed contact 87a; the pulse relay K003 is powered off, and the state of the contact group thereof remains unchanged. When the diesel engine control system issues the starting signal again, the intermediate relay K002 acts, at this time the normally closed contact group 5, 6 of the pulse relay K003 is switched to the closed state, the control circuit of the standby motor M2 is connected, and the normally open contact group 1, 2 is switched to the open state, the control circuit of the main motor is disconnected, thus realizing the automatic switching of the main and standby starting motors.

[0055] As to the repeated starting function: the application makes full use of the output state change characteristic of the detection terminal of the starting motor, i.e. whether the 48 terminal engages in place: when the motor output gear engages in place, the 48 terminal outputs 24V+, and when the gear does not engage in place, the 48 terminal outputs negative. Specifically, the signal input control end of the diesel engine control system sends a starting signal to the intermediate relay K002 to make it turn on, the pulse relay K003 is connected through the 50g end, the coil LA in the repeated starting relay is powered to act (its controlled normally open contact is closed), the 50h end inputs 24V power+, the motor starts to work, and when the output gear engages in place, the 48 terminal is 24V+, at this time the coil LB cannot act, the 50h end always inputs starting voltage, and the motor works smoothly. When the output gear does not engage in place, the 48 terminal is negative, the positive voltage of the capacitor C1 rises, and a potential difference is formed with the 48 terminal, at this time the diode D1 is turned on, the capacitor is discharged, the coil LB acts (its controlled normally closed contact is opened), the power supply of the coil LA is disconnected, the normally open contact controlled by the coil LA is reset and disconnected, at this time the 50h end connected with the 50 end of the starting motor has no power input, the starting motor does not work, and the output gear is reset under the action of the spring force. When the capacitor C1 is discharged (about 2S), the normally closed contact controlled by the coil LB is reset and closed, at this time the coil LA connects the 24V power supply of the 50g end, the coil LA acts, the normally open contact is closed, the 24V power supply is connected to the 50h end, i.e. the 50 end of the starting motor, and the starting motor works for the next round, which realizes the repeated starting function.

[0056] As shown in the timing diagram of the starting process embodiment controlled by the application: Figure 2

[0057] 1. The main motor cannot be normally started in the first starting signal input period, the main repeated starting relay K01 repeats starting for three times, the starting signal delay is reached, and at this time the starting signal is cancelled.

[0058] 2. The control system delays and inputs the starting signal again, at this time the starting device has switched the starting circuit to the standby motor, the standby repeated starting relay K02 acts, the standby motor normally engages to drive the diesel engine to rotate at 300r / m, at this time the control system monitors that the diesel engine rotates at the normal starting success speed, and cancels the starting signal output.

[0059] The application has the advantages that when the pinion does not engage, repeated engagement starting can be realized, and the main and standby redundant motor starting control can be automatically switched.

[0060] The above only describes the preferred embodiments of the application and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.​

Claims

1. A starting control device for a nuclear safety-grade diesel engine with dual motors, characterized in that, This includes the main motor M1, the standby motor M2, the diesel engine control system, intermediate relay K002, pulse relay K003, intermediate relay K004, main repetitive start relay K01, and auxiliary repetitive start relay K02; The coil of intermediate relay K002 is connected between the positive and negative terminals of the diesel engine start signal input control terminal of the diesel engine control system, and the coil of intermediate relay K004 is connected between the positive and negative terminals of the starter control terminal of the diesel engine control system. The common contact 30 of intermediate relay K002 is connected to the normally open contact 87 of intermediate relay K004, and the normally closed contact 87a of intermediate relay K002 is left floating. The normally open contact 87 of the intermediate relay K002 is connected to the A1 terminal of the coil of the pulse relay K003, the normally open group contact 1 terminal of the pulse relay K003, and the normally closed group contact 5 terminal of the pulse relay K003. The normally open group contact 2 terminal of the pulse relay K003 is connected to the 50g terminal of the main repetitive starting relay K01, and the normally closed group contact 6 terminal of the pulse relay K003 is connected to the 50g terminal of the auxiliary repetitive starting relay K02. The A2 terminal of the pulse relay K003 coil is connected to the negative terminal of the battery power supply, forming a circuit with the A1 terminal connected to the normally open contact 87 of the intermediate relay K002 to realize the control function. The common contact 30 of intermediate relay K004 is connected to the positive terminal of the battery power supply via fuse F001; the normally closed contact 87a of intermediate relay K004 is left floating. The positive terminal of the battery power supply is also connected to the 30 terminal of the main motor M1 and the standby motor M2 respectively; The negative terminal of the battery power supply is also connected to terminal 31 of the main motor M1 and the standby motor M2, as well as terminal 31 of the main repetitive start relay K01 and the auxiliary repetitive start relay K02. The 50 terminal of the main motor M1 is connected to the 50h terminal of the main repetitive start relay K01; The 48 terminal of the main motor M1 is connected to the 48 terminal of the main repetitive start relay K01; The 50 terminal of the standby motor M2 is connected to the 50h terminal of the auxiliary repeating start relay K02; The 48 terminal of the standby motor M2 is connected to the 48 terminal of the auxiliary repeating start relay K02.

2. The starting control device for a nuclear safety-grade diesel engine with dual motor starting as described in claim 1, characterized in that, The main repetitive starting relay K01 and the auxiliary repetitive starting relay K02 have the same structure, both including two coils: coil LA and coil LB. Each coil controls one contact, where coil LA controls a normally open contact and coil LB controls a normally closed contact. Among them, terminal 31 is connected to one end of coil LA, the other end of coil LA is electrically connected to one end of coil LB and one end of normally closed contact, the other end of normally closed contact of LB is connected to one end of normally open contact of LA and terminal 50g, and the other end of normally open contact of LA is connected to terminal 50h; a capacitor C1 is connected in parallel with coil LB, and the other end of coil LB is connected to the positive terminal of diode D1, and the negative terminal of diode D1 is connected to terminal 48.

3. The starting control device for a nuclear safety-grade diesel engine with dual motor starting as described in claim 1, characterized in that, The battery power source is a 24V battery pack.

4. The starting control device for a nuclear safety-grade diesel engine with dual motor starting as described in claim 1, characterized in that, The intermediate relay K002 is model number Chint JD2914F.

5. The starting control device for a nuclear safety-grade diesel engine with dual motor starting as described in claim 1, characterized in that, The intermediate relay K004 is model number Chint JD2914F.

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