CN115395859A - High-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission - Google Patents
High-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission Download PDFInfo
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- CN115395859A CN115395859A CN202211135855.6A CN202211135855A CN115395859A CN 115395859 A CN115395859 A CN 115395859A CN 202211135855 A CN202211135855 A CN 202211135855A CN 115395859 A CN115395859 A CN 115395859A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/06—Controlling the motor in four quadrants
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/02—Details of stopping control
- H02P3/04—Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention relates to the field of high-power speed regulation, in particular to a high-reliability full-range electromechanical integrated speed regulation device based on planetary gear transmission. The speed regulating device can further improve the reliability and has linkage standby capability.
Description
Technical Field
The invention relates to the field of high-power speed regulation, in particular to a high-reliability full-range electromechanical integrated speed regulation device based on planetary gear transmission, which is suitable for the field of industrial driving speed regulation, such as the driving of equipment such as a boiler feed pump of a power station, a compressor in petrochemical and natural gas industries and the like.
Background
The electromechanical integrated planetary speed regulation device obtains good operation performance recently since the operation of individual demonstration projects, the electromechanical integrated planetary speed regulation device is used as high-power speed regulation equipment with the highest efficiency at present, the great attention is attracted to related industry fields, the reliability level can be accepted by most industrial application scenes, and higher requirements are put on the reliability in some special application occasions.
Disclosure of Invention
The invention provides a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission, which can further improve the reliability and has linkage standby capacity. The invention discloses an electromechanical integrated planetary speed regulating device, which has the application number of 202110958640.3 and is named as an electromechanical integrated planetary speed regulating device with a full-range speed regulation.
The invention is realized by adopting the following technical scheme: a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission comprises a main drive motor, a main drive end gear, a differential planetary mechanism, a speed regulating end idler gear, a speed regulating end gear, a synchronous automatic clutch, a clutch output end gear, a clutch output end idler gear, a speed regulating motor, a four-quadrant frequency converter, a main drive motor bypass switch, a service electric system, a speed regulating motor switch and a main drive motor incoming line switch, wherein an inner gear ring input shaft of the differential planetary mechanism is connected with the main drive end gear, the main drive end gear is connected with the clutch output end gear through the clutch output end idler gear, the clutch output end gear is connected with an output shaft of the synchronous automatic clutch, the main drive motor is connected with the main drive end gear, a sun gear of the differential planetary mechanism is connected with driven equipment, a planet carrier of the differential planetary mechanism is connected with the speed regulating end idler gear, and the speed regulating end idler gear is meshed with the speed regulating end gear, one end of a speed regulating end gear is connected with a speed regulating motor, an idle gear at the speed regulating end is connected with an input shaft of a synchronous automatic clutch, the synchronous automatic clutch also comprises an electromagnetic brake, a phase-shifting transformer, a solid soft start device, a phase-shifting transformer incoming line switch, a forward bypass switch of the speed regulating motor and a reverse bypass switch of the speed regulating motor, the other end of the speed regulating end gear is connected with the electromagnetic brake, wherein the phase-shifting transformer comprises a high-voltage winding of the phase-shifting transformer, a first low-voltage winding of the phase-shifting transformer and a second low-voltage winding of the phase-shifting transformer, the second low-voltage winding of the phase-shifting transformer is respectively connected with the speed regulating motor through the forward bypass switch of the speed regulating motor and the reverse bypass switch of the speed regulating motor, the first low-voltage winding of the phase-shifting transformer is connected with the input end of a four-quadrant frequency converter, the output end of the four-quadrant frequency converter is connected with the speed regulating motor through the switch of the speed regulating motor, the high-voltage winding of the phase-shifting transformer is connected with a service electric system through the phase-shifting transformer incoming line switch, one end of the solid soft starting device is connected with the station service electric system through a main drive motor incoming line switch, the other end of the solid soft starting device is connected with the main drive motor, and two ends of the solid soft starting device are connected with a main drive motor bypass switch in parallel.
The working principle is as follows: when the electromechanical integrated speed regulating device is normally started, the four-quadrant frequency converter drives the speed regulating motor to carry out variable-frequency speed regulation starting, so that the speed regulating end gear, the speed regulating end idle gear and the planet carrier are driven to increase in speed, the speed regulating end idle gear increases in speed to enable the synchronous automatic clutch to be engaged with the driving clutch output end gear, the clutch output end idle gear and the main driving end gear to increase in speed, so that the main driving motor and the inner gear ring are driven to increase in speed, the sun gear drives the driven equipment to increase in speed, when the output of the four-quadrant frequency converter reaches the reverse highest frequency, the main driving motor reaches the synchronous rotating speed corresponding to the power frequency, and the rotating speed of the driven equipment reaches the upper limit of the speed regulating rotating speed of a low-speed interval. Then, the main drive motor is started (soft grid connection) by a thyristor slope voltage mode through a solid soft start device, after the rated voltage is reached, a bypass switch of the main drive motor is switched on, the solid soft start device stops running, the output frequency of the four-quadrant frequency converter is gradually reduced, the synchronous automatic clutch is disengaged as the rotating speed of the speed regulating motor is reduced, the rotating speed of the sun wheel is increased, the driven device is driven to continuously increase the speed, the driven device enters a high-speed interval speed regulating working condition, the rotating speed is increased to the highest rotating speed as the reversing of the speed regulating motor is carried out, and the rotating speed of the driven device reaches the upper limit of the speed regulating rotating speed of the high-speed interval.
Under the working condition of speed regulation in a high-speed interval, when a four-quadrant frequency converter of the electromechanical integrated speed regulation device is tripped due to faults, a disposal method is determined according to the running rotating speed of a driven device before the faults occur. When the running speed of the driving equipment is relatively high, when the speed regulating motor runs in forward rotation at a high rotating speed, a forward bypass switch of the speed regulating motor can be interlocked to switch the speed regulating motor into power frequency running (forward rotation), and when the rotating speed of the speed regulating motor is low or the speed regulating motor fails, an electromagnetic brake can be started to stop the speed of the speed regulating motor; when the running speed of the driving equipment is relatively low, the speed regulating motor runs in a reverse mode at a high rotating speed, a reverse bypass switch of the speed regulating motor can be interlocked, and the speed regulating motor is switched to power frequency running (reverse running); when the driving equipment runs at a very low rotating speed, the speed regulating motor runs in a reverse rotation mode at a very high rotating speed without any operation, and when the speed regulating motor rises to the highest rotating speed, the synchronous automatic clutch is automatically engaged, and the driven equipment keeps running at a constant speed.
When the driven equipment is in linkage standby, the working equipment trips, the standby equipment is started in an interlocking manner, the main driving motor is started directly at full pressure to drive the whole mechatronic speed regulation device to increase the speed, the synchronous automatic clutch is engaged at the moment, the mechatronic speed regulation device is equivalent to a constant speed ratio gear box, when the main driving motor is fixed, the rotating speed of the driven equipment reaches the upper limit of a low-rotating-speed regulation range (the lower limit of a high-rotating-speed regulation range), the speed regulation motor is driven to rotate to the highest rotating speed (reverse rotation), in the speed increasing process of the main driving motor, the four-quadrant frequency converter is started synchronously, the speed regulation motor is boosted, after the main driving motor is fixed, the speed regulation motor enters a variable-frequency working state, and the driven equipment enters a high-speed interval speed regulation running state.
According to the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission, the phase-shifting transformer is replaced by the double-winding transformer or the three-winding transformer, the low-voltage winding of the double-winding transformer is provided with the middle tap, the low-voltage winding of the double-winding transformer is connected with the input end of the four-quadrant frequency converter, the middle tap of the low-voltage winding of the double-winding transformer is connected with the bypass switch of the speed regulating motor, the first low-voltage winding of the three-winding transformer is connected with the input end of the four-quadrant frequency converter, and the second low-voltage winding of the three-winding transformer is connected with the bypass switch of the speed regulating motor.
According to the high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission, the speed regulating motor is replaced by the servo motor.
According to the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission, the idle wheel at the output end of the clutch is a two-stage idle wheel at the output end of the clutch, other stages can be adopted for matching the center distance or the steering of the gear, and the idle wheel is arranged at other positions.
The transmission mechanism can comprise a speed regulating motor, a speed regulating end idler gear, a speed regulating end gear, a synchronous automatic clutch, a clutch output end gear and a clutch output end idler gear, the transmission mechanism can only comprise the speed regulating motor, the speed regulating end idler gear and the speed regulating end gear, and another set of transmission mechanism can be added on the basis of the original set of traditional mechanism.
According to the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission, the speed regulating motor is a high-speed motor, and the design frequency is greater than the power frequency (50 Hz or 60 Hz).
The invention has the beneficial effects that:
1) The invention can realize that the speed regulating motor is switched to power frequency operation under the condition of fault tripping of the four-quadrant frequency converter, and the constant-speed operation of the device is maintained.
2) The invention can realize the electromagnetic braking of the speed regulating motor and maintain the constant-speed running of the device under the condition of fault tripping of the four-quadrant frequency converter or the speed regulating motor.
3) The invention can realize a plurality of constant-speed running rotating speeds, can well match the process flow under the condition of fault tripping of the four-quadrant frequency converter or the speed regulating motor, and improves the reliability of the system.
4) The invention can realize the accident linkage standby of the driven equipment.
Drawings
FIG. 1 is a schematic diagram of a shafting structure of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 2 is a schematic diagram of an electrical system of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 3 is a power flow diagram of a low-speed working condition of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 4 is a schematic diagram of power flow of a high-speed working condition (planet carrier reversal) of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 5 is a schematic diagram of power flow of a high-speed working condition (forward rotation of a planet carrier) of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 6 is a schematic diagram of a three-winding transformer of the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
FIG. 7 is a schematic diagram of a double-winding transformer of a high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission.
In the figure: 1-main drive motor, 2-main drive end coupler, 3-main drive end gear, 4-inner gear ring, 5-planet carrier, 6-sun gear, 7-output end coupler, 8-water feed pump, 9-speed regulation end idler gear, 10-speed regulation end gear, 11-synchronous automatic clutch, 12-clutch output end gear, 13-clutch output end two-stage idler gear, 14-speed regulation end coupler, 15-speed regulation motor, 16-four quadrant frequency converter, 17-speed regulation motor reverse bypass switch, 18-main drive motor bypass switch, 19-plant power system, 20-speed regulation motor switch, 21-main drive motor inlet switch, 22-solid soft start device, 23-electromagnetic brake, 24-electromagnetic brake coupler, 25-phase-shift transformer high-voltage winding, 26-phase-shift transformer inlet switch, 27-transformer first low-voltage winding, 28-phase-shift transformer second low-voltage winding, 29-speed regulation motor forward bypass switch, 30-three-winding transformer high-voltage winding, 31-three-winding transformer first low-voltage winding, 32-three-voltage winding transformer second low-voltage winding, 33-double-low-voltage winding transformer high-voltage winding 34-double voltage winding.
Detailed Description
Example 1: a high-reliability full-range electromechanical integrated speed regulation device based on planetary gear transmission takes a boiler feed pump of a power station as an example, and comprises a main drive motor 1, a main drive end coupler 2, a main drive end gear 3, an inner gear ring 4, a planet carrier 5, a sun gear 6, an output end coupler 7, a feed pump 8, a speed regulation end idler 9, a speed regulation end gear 10, a synchronous automatic clutch 11, a clutch output end gear 12, a clutch output end two-stage idler 13, a speed regulation end coupler 14, a speed regulation motor 15, an electromagnetic brake 23 and an electromagnetic brake coupler 24, wherein the connection mode is shown in figure 1, the high-reliability full-range electromechanical integrated speed regulation device is designed according to the condition that the rotating speed of a reversing point of the planet carrier is 80.3 percent of rated rotating speed, wherein the inner gear ring 4, the planet carrier 5 and the sun gear 6 form a differential planetary mechanism, and the speed regulation end idler 9, the speed regulating end gear 10 and the planet carrier 5 form a speed regulating mechanism of the differential planetary mechanism, the speed regulating end idler 9, the synchronous automatic clutch 11, the clutch output end gear 12, the clutch output end two-stage idler 13 and the main drive end gear 3 form a main drive motor speed regulating/constant speed clutch mechanism, the speed regulating/constant speed clutch mechanism further comprises a four-quadrant frequency converter 16, a main drive motor bypass switch 18, a service electric system 19, a speed regulating motor switch 20, a main drive motor incoming line switch 21, a solid soft start device 22, a phase shifting transformer high-voltage winding 25, a phase shifting transformer incoming line switch 26, a phase shifting transformer first low-voltage winding 27 (a plurality of phase shifting transformer first low-voltage windings), a phase shifting transformer second low-voltage winding 28, a speed regulating motor forward bypass switch 29 and a speed regulating motor reverse bypass switch 17, and the connection mode is shown in fig. 2.
The device has zero starting speed and low speed interval speed regulation: the electromagnetic brake 23 is in a non-braking state, the bypass switch 18 of the main drive motor and the inlet switch 21 of the main drive motor are in an off state, the solid soft start device 22 is not started, the inlet switch 26 of the phase shift transformer is switched on, the phase shift transformer is electrified, the four-quadrant frequency converter 16 is electrified, the speed regulation motor switch 20 is switched on, the four-quadrant frequency converter 16 is started, the output frequency of the four-quadrant frequency converter 16 is gradually increased, the speed regulation motor 15 is driven to increase the speed, the speed regulation end gear 10 and the speed regulation end idler gear 9 are driven to increase the speed, the speed regulation end idler gear 9 enables the synchronous automatic clutch 11 to be connected with the drive clutch output end gear 12, the clutch output end two-stage idler gear 13 and the main drive end gear 3 to increase the speed, the main drive motor 1 and the inner gear ring 4 are driven to increase the speed, the planet carrier 5, the sun gear 6 and the water supply pump 8 are driven to increase the speed, wherein the planet carrier 5 transmits power to the speed regulation end idler gear 9 to form a closed mechanical power cycle, and at the moment, the whole electromechanical integrated speed regulation device forms a whole body to become a fixed speed ratio gear box. The speed regulating motor 15 reaches the reverse maximum rotating speed, at this time, the water feeding pump 8 reaches the upper limit of the rotating speed (53.3% rotating speed, corresponding to the frequency of the four-quadrant frequency converter 16 being-100 Hz) of the speed regulation in the low-speed interval, the rotating speed range of the water feeding pump 8 is 0% -53.3%, the power flow is as shown in figure 3, and the boundary point of the high-speed regulating range and the low-speed regulating range can be optimized according to the working condition of the driven equipment.
Switching speed regulation between a low-speed interval and a high-speed interval: when the output of the four-quadrant frequency converter 16 reaches the reverse highest frequency, the main drive motor 1 reaches the synchronous rotating speed corresponding to the power frequency, and the rotating speed of the water feed pump 8 reaches the upper limit of the speed regulating rotating speed in the low-speed interval. Then, a lead-in switch 21 of the main drive motor is switched on, the main drive motor 1 is started in a thyristor slope voltage mode through a solid state soft start device 22, after the rated voltage is reached, a bypass switch 18 of the main drive motor is switched on, the solid state soft start device 22 is out of operation, and the speed of the device is switched from a low-speed interval to a high-speed interval.
Speed regulation of working speed range of water supply pump (speed regulation in high speed interval): when the device finishes speed regulation from a low-speed interval to a high-speed interval, the device is in the lower limit of the speed regulation speed range of the high-speed interval (the planet carrier and the inner gear ring rotate in the same direction, the inner gear ring rotates at a constant speed according to a planetary differential principle, the rotation speed of the planet carrier is increased when the planet carrier and the inner gear ring rotate in the same direction, the rotation speed of the sun wheel is reduced, namely when the speed regulation motor is in the upper limit of the speed regulation range, the water supply pump is in the lower limit of the speed regulation range of the high-speed interval), the speed regulation motor 15 is in the highest rotation speed of the speed regulation range, the synchronous automatic clutch 11 is still in an engagement state, when the rotation speed of the water supply pump 8 needs to be increased, the output frequency of the four-quadrant frequency converter 16 is reduced, the rotation speed of the input end of the synchronous automatic clutch 11 is reduced, the rotation speed of the output end is unchanged, therefore, the synchronous automatic clutch 11 is disengaged, the rotation speed of the water supply pump 8 is increased, when the rotation speed of the speed regulation motor 15 rotates in a highest rotation speed range from 53.3% to 80.3% when the speed range of the high-speed interval, and the power flow is as shown in figure 4. When the speed regulating motor 15 is reversed to rotate in the forward direction until the highest rotating speed of the forward rotation (the frequency corresponding to the four-quadrant frequency converter 16 is 73.3 Hz), the rotating speed range of the water feeding pump 8 is 80.3% -100%, and the power flow is as shown in FIG. 5.
Switching speed regulation between a high-speed interval and a low-speed interval: when the rotating speed (reverse rotation) of the speed regulating motor 15 reaches the upper limit of a speed regulating range, the synchronous automatic clutch 11 is engaged, the bypass switch 18 of the main driving motor is disconnected, the main driving motor 1 enters a driven and rotating state, then the output frequency of the four-quadrant frequency converter 16 is gradually reduced, the rotating speed of the speed regulating motor 15 is reduced, and the rotating speed of the water feeding pump 8 is also synchronously reduced.
The higher load accident condition of the unit: at the moment, the speed regulating motor 15 is in a forward rotation state, the weakest link of the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission is the four-quadrant frequency converter 16, when the four-quadrant frequency converter 16 is in fault trip, the speed regulating motor switch 20 is switched off, the speed regulating motor forward bypass switch 29 is switched on in an interlocking manner, the speed regulating motor 15 is in power frequency switching operation (forward rotation), the second low-voltage winding 28 of the phase shifting transformer is directly connected with the belt [ at the moment, the load of the speed regulating motor 15 is about 60%, the power factor of the motor is not greatly changed, so under the condition of keeping the same current, the voltage of the second low-voltage winding 28 of the phase shifting transformer is about 60% of the capacity of the first low-voltage winding (a plurality of windings and connected with the four-quadrant frequency converter) 27 of the phase shifting transformer, the impact in the power frequency switching process can be reduced ], the rotating speed of the water feeding pump is 93.7% of rated rotating speed, a common unit is provided with 2 x 50% of capacity operating pumps, after one pump is switched to be operated at a fixed speed, the flow can be adjusted in a certain range, and the water feeding unit can still change the load in a certain range.
The medium load accident condition of the unit is as follows: at the moment, the speed regulating motor 15 is in a low-speed state of forward rotation or reverse rotation, when the four-quadrant frequency converter 16 or the speed regulating motor 15 is tripped due to faults, the speed regulating motor switch 20 is disconnected, the electromagnetic brake 23 is started to brake the planet carrier 5, the rotating speed of the water feeding pump is 80.3% of the rated rotating speed at the moment, a common unit is provided with operating pumps with 2 x 50% of capacity, after one pump is switched to be operated at a fixed speed, the water feeding flow can be regulated within a certain range through the other pump, and the load of the unit can still be changed within a certain range.
The lower load accident condition of the unit: at the moment, the speed regulating motor 15 is in a reverse rotation state, the weakest link of the high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission is the four-quadrant frequency converter 16, when the four-quadrant frequency converter 16 trips due to faults, the speed regulating motor switch 20 is switched off, the speed regulating motor reverse bypass switch 30 is switched on in an interlocking mode, the speed regulating motor 15 is switched to operate at a working frequency (reverse rotation), the low-voltage winding (connected with the speed regulating motor) 28 of the phase-shifting transformer is directly connected with a belt (the load of the speed regulating motor 15 is about 30 percent at the moment), the rotating speed of a water feeding pump is 66.8 percent of rated rotating speed at the moment, a common unit is provided with operating pumps with 2 multiplied by 50 percent of capacity, after one pump is switched to operate at a fixed speed, the water feeding flow can be regulated in a certain range through the other pump, and the unit can still change the load in a certain range.
When the load of the unit is extremely low (deep peak regulation state), the speed regulating motor 15 is in a high-speed state of reverse rotation, when the four-quadrant frequency converter 16 or the speed regulating motor 15 is tripped due to faults, no operation is carried out, the rotating speed of the water feeding pump is reduced, when the rotating speed is reduced to 53.3 percent of the rotating speed, the synchronous automatic clutch 11 is engaged, and the water feeding is switched to a constant-speed running state.
According to the accident working condition, the four rotating speeds of the water feeding pump, such as 93.7%, 80.3%, 66.8%, 53.3% and the like, are matched with the output of the unit according to different loads of the unit before the accident, the water feeding flow is adjusted in a certain range through the other pump, the working conditions of all the loads of the unit can be basically met, and even if the output of the water feeding pump is not well matched with the load of the unit, the thermotechnical control system of the unit can still pass the RB function, so that the unit can achieve a safe working condition.
If the unit is in single-pump operation, the four-quadrant frequency converter 16 and the speed regulating motor 15 are in failure, and the water supply flow can still be regulated by the minimum flow valve of the pump after the water supply pump is switched to constant-speed operation.
Accident linkage working condition: when the pump set is standby, the incoming line switch 26 of the phase-shifting transformer is in a switch-on state, the phase-shifting transformer is electrified, the four-quadrant frequency converter 16 is in a power-on standby state, the speed regulating motor switch 20 is in a switch-on state, the incoming line switch of the main driving motor is in a switch-on state, when a combined pump signal is sent, the bypass switch 18 of the main driving motor is interlocked, the main driving motor 1 is fully pressed and directly started to drive the inner gear ring 4 to increase the speed, so as to drive the planet carrier 5 and the sun gear 6 to increase the speed, the sun gear 6 drives the water feeding pump 8 to increase the speed, due to the resistance effect of the water feeding pump 8, the planet carrier 5 can preferentially increase the speed, so as to drive the idle gear 9 at the speed regulating end to increase the speed, when the rotating speed of the gear has the rotating speed exceeding trend of the gear 12 at the output end of the clutch, the synchronous automatic clutch 11 is engaged, at the moment, the planetary gear device becomes a constant speed ratio gear box to follow the synchronous speed increasing of the main drive motor 1, when the main drive motor 1 is in constant speed, the rotating speed of the water supply pump 8 reaches 53.3 percent of rated rotating speed, in the speed increasing process of the pump set, the four-quadrant frequency converter 16 tracks the rotating speed through an encoder arranged on the speed regulating motor 15, the four-quadrant frequency converter 16 starts to output the frequency corresponding to the synchronous rotating speed of the speed regulating motor 15, the voltage is increased according to a voltage frequency curve, the excitation process of the motor is completed, when the main drive motor 1 is in constant speed, the four-quadrant frequency converter 16 immediately starts to carry out frequency regulation, the target frequency is quickly reached, and the water supply pump 8 reaches the required output.
Example 2: as shown in fig. 6, the high-reliability full-range electromechanical integrated speed regulation device based on planetary gear transmission is different from that of embodiment 1 in that a three-winding transformer is adopted instead of a phase-shifting transformer, and the three-winding transformer is composed of a three-winding transformer high-voltage winding 30, a three-winding transformer first low-voltage winding 31 (connected with the input end of a four-quadrant frequency converter) and a three-winding transformer second low-voltage winding 32 (connected with a speed regulation motor), the four-quadrant frequency converter 16 adopts a single-stage high-voltage type instead of a cascade type, and the operation mode is the same as that of embodiment 1.
Example 3: as shown in fig. 7, the high-reliability full-range electromechanical integrated speed regulation device based on planetary gear transmission is different from the embodiment 2 in that a transformer does not adopt a three-winding transformer, but adopts a double-winding transformer with a low-voltage middle tap, and is composed of a double-winding transformer high-voltage winding 33 and a double-winding transformer low-voltage winding 34 (connected with the input end of a four-quadrant frequency converter), the middle tap of the double-winding transformer low-voltage winding is connected with a speed regulation motor, and the operation mode is the same as that of the embodiment 1.
Claims (6)
1. The high-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission comprises a main drive motor (1), a main drive end gear (3), a differential planetary mechanism, a speed regulating end idler (9), a speed regulating end gear (10), a synchronous automatic clutch (11), a clutch output end gear (12), a clutch output end idler, a speed regulating motor (15), a four-quadrant frequency converter (16), a main drive motor bypass switch (18), a service power system (19), a speed regulating motor switch (20) and a main drive motor inlet wire switch (21), wherein an inner gear ring (4) input shaft of the differential planetary mechanism is connected with the main drive end gear (3), the main drive end gear (3) is connected with the clutch output end gear (12) through the clutch output end idler, the clutch output end gear (12) is connected with an output shaft of the synchronous automatic clutch (11), the main drive motor (1) is connected with the main drive end gear (3), a sun gear (6) of the differential planetary mechanism is connected with driven equipment, a planet carrier (5) of the planetary mechanism is connected with the speed regulating end idler (9), the speed regulating end idler (9) and the speed regulating end gear (10) are meshed with the speed regulating end idler (15), and the speed regulating end input shaft of the synchronous automatic clutch (11);
the method is characterized in that: the high-voltage power station system further comprises an electromagnetic brake (23), a phase-shifting transformer, a solid soft start device (22), a phase-shifting transformer incoming line switch (26), a speed regulating motor forward bypass switch (29) and a speed regulating motor reverse bypass switch (17), the other end of the speed regulating end gear (10) is connected with the electromagnetic brake (23), the phase-shifting transformer comprises a phase-shifting transformer high-voltage winding (25), a phase-shifting transformer first low-voltage winding (27) and a phase-shifting transformer second low-voltage winding (28), the phase-shifting transformer second low-voltage winding (28) is respectively connected with the speed regulating motor reverse bypass switch (17) through the speed regulating motor forward bypass switch (29), the speed regulating motor reverse bypass switch (17) is connected with the speed regulating motor (15), the phase-shifting transformer first low-voltage winding (27) is connected with the input end of a four-quadrant frequency converter (16), the output end of the four-quadrant frequency converter (16) is connected with the speed regulating motor (15) through the speed regulating motor switch (20), the phase-shifting transformer high-voltage winding (25) is connected with a power station system (19) through the phase-shifting transformer incoming line switch (26), one end of the solid soft start device (22) is connected with the power station system (19) through a main drive motor incoming line switch (21), the other end of the main drive soft start device (1), and two bypass motor bypass switch (18) are connected with the main drive motor.
2. The high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission as claimed in claim 1, wherein: the phase-shifting transformer is replaced by a double-winding transformer or a three-winding transformer, the low-voltage winding of the double-winding transformer is provided with a middle tap, the low-voltage winding (34) of the double-winding transformer is connected with the input end of the four-quadrant frequency converter (16), the middle tap of the low-voltage winding (34) of the double-winding transformer is connected with a bypass switch of the speed regulating motor (15), the first low-voltage winding (31) of the three-winding transformer is connected with the input end of the four-quadrant frequency converter (16), and the second low-voltage winding (32) of the three-winding transformer is connected with the bypass switch of the speed regulating motor.
3. The high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission as claimed in claim 1 or 2, wherein: the speed regulating motor (15) is replaced by a servo motor.
4. The high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission according to claim 1 or 2, characterized in that: the idle gear at the output end of the clutch is a two-stage idle gear (13) at the output end of the clutch, other stages are possible for matching the center distance or the steering of the gear, and the idle gear is arranged at other positions.
5. The high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission as claimed in claim 1 or 2, wherein: the transmission mechanism can comprise a speed regulating motor, a speed regulating end idler gear, a speed regulating end gear, a synchronous automatic clutch, a clutch output end gear and a clutch output end idler gear, the transmission mechanism can also comprise only the speed regulating motor, the speed regulating end idler gear and the speed regulating end gear, and on the basis of the original set of traditional mechanism, another set of transmission mechanism can be added.
6. The high-reliability full-range electromechanical integrated speed regulating device based on the planetary gear transmission as claimed in claim 1 or 2, wherein: the speed regulating motor (15) is a high-speed motor, and the design frequency is greater than the power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211135855.6A CN115395859A (en) | 2022-09-19 | 2022-09-19 | High-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211135855.6A CN115395859A (en) | 2022-09-19 | 2022-09-19 | High-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission |
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| CN115395859A true CN115395859A (en) | 2022-11-25 |
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|---|---|---|---|
| CN202211135855.6A Pending CN115395859A (en) | 2022-09-19 | 2022-09-19 | High-reliability full-range electromechanical integrated speed regulating device based on planetary gear transmission |
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| Country | Link |
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| CN (1) | CN115395859A (en) |
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2022
- 2022-09-19 CN CN202211135855.6A patent/CN115395859A/en active Pending
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