CN210724619U - Switching control circuit for main oil pump of air blower - Google Patents
Switching control circuit for main oil pump of air blower Download PDFInfo
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- CN210724619U CN210724619U CN201921338137.2U CN201921338137U CN210724619U CN 210724619 U CN210724619 U CN 210724619U CN 201921338137 U CN201921338137 U CN 201921338137U CN 210724619 U CN210724619 U CN 210724619U
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Abstract
The utility model discloses a main oil pump switching control circuit of a blower, which comprises a main loop and a control loop connected with the main loop, wherein the main loop comprises a low-voltage circuit breaker QF1, a contactor KM, a motor cooling fan, an oil pump motor and a frequency converter; the three-phase four-wire system power supply is respectively connected with three upper ports of a low-voltage circuit breaker QF1, and three lower ports of the low-voltage circuit breaker QF1 are connected with three upper ports of the contactor KM; and three lower ports of the contactor KM are respectively connected with the input end of the frequency converter and the motor cooling fan, and the output end of the frequency converter is connected with the oil pump motor. The utility model discloses can make the electric oil pump motor need than longer dead time and can quick start when the oil pressure reduces when switching, avoid causing the unit to shut down when activestandby oil pump switches, arouse the unit to restart to cause the influence to whole process systems, reduce the time that the machine that opens of unit accomplishes the back switch.
Description
Technical Field
The utility model belongs to the technical field of air-blower control, a circuit is related to, especially an air-blower main oil pump switches control circuit.
Background
When the air blower is started and debugged, the electric oil pump firstly runs to lubricate the unit, when the starting process is finished and the unit runs at a full rotating speed, the electric oil pump is switched to the main oil pump to run, the electric oil pump stops running, the loss of electric energy in the running process is reduced, and the oil cut of a process system cannot be caused when a low-voltage power supply of the system fails, so that the reliable and safe running of key equipment can be effectively protected. The method has the defects that the method has very high requirements on the stable switching of the main and standby oil pumps, and if the main oil pump cannot be reliably switched to the running mode in the switching process, the unit cannot be normally put into operation, so that the whole process system stops running, and great economic loss is caused. Therefore, aiming at the working mode, the unit is required to run stably when being switched, the normal running of the unit cannot be influenced, and the running of the electric oil pump is controlled under the background.
Disclosure of Invention
To the defect or not enough that exist among the above-mentioned prior art, the utility model aims to provide an air-blower main oil pump switches control circuit.
In order to achieve the above object, the utility model discloses take following technical solution:
a main oil pump switching control circuit of a blower comprises a main loop and a control loop connected with the main loop, wherein the main loop consists of a low-voltage circuit breaker QF1, a contactor KM, a motor cooling fan, an oil pump motor and a frequency converter; the three-phase four-wire system power supply is respectively connected with three upper ports of a low-voltage circuit breaker QF1, and three lower ports L11, L12 and L13 of the low-voltage circuit breaker QF1 are connected with three upper ports of the contactor KM; three lower ports U1, V1 and W1 of the contactor KM are respectively connected with an input end R, S, T of a frequency converter and the motor cooling fan, and an output end U, V, W of the frequency converter is connected with the oil pump motor.
Further, the frequency converter adopts a Siemens G120 frequency converter.
Further, the control circuit comprises a micro-break switch QF2, a remote local transfer switch SA1, a manual start button SB1, an automatic start button SB10, a self-locking stop button SB2, a remote stop button SB20, a fault indicator lamp, a power indicator lamp, an operation lamp, a direct current DC24V power supply, intermediate relays KA1, KA2, KA3, KA4, KA5, KA6 and KA 7; wherein:
the input end of the micro-disconnecting switch QF2 is connected with a zero line N and an L1 phase of the three-phase four-wire system power supply, the outputs L22 and N2 of the micro-disconnecting switch QF2 provide a working power supply for the whole secondary circuit, and ten branches are connected in parallel between L22 and N2:
a first branch: the manual mode of the transfer switch SA1 is connected in series with the manual start button SB1, the manual start button SB1 is connected in series with the coil of the intermediate relay KA 1;
a second branch circuit: the automatic mode of the changeover switch SA1 is connected in series with the automatic start button SB10, the automatic start button SB10 is connected in series with the coil of the intermediate relay KA 2;
a third branch circuit: an output normally closed contact of the intermediate relay KA5 is connected in series with a normally open contact of the contactor KM, a normally open contact of the intermediate relay KA1 and a contact of the intermediate relay KA2 in parallel, then connected in series with a normally closed contact of the intermediate relay KA7 and then connected in series with a coil of the contactor KM;
a fourth branch: a normally closed contact of the intermediate relay KA4 is connected with a normally open contact of the contactor KM in series and then connected with a coil of the intermediate relay KA3 in series;
a fifth branch circuit: a normally closed contact of the intermediate relay KA5 is connected in series with the manual self-locking stop button SB2 and the automatic self-locking stop button SB20 in parallel, then is connected in series with a normally open contact of the contactor KM, and then is connected in series with a coil of the intermediate relay KA 4;
a sixth branch: a normally open contact of the intermediate relay KA4 is connected in series with a normally open contact of the intermediate relay KA6 and then connected in series with a coil of the intermediate relay KA 5;
a seventh branch: a normally open contact of the intermediate relay KA7 is connected with the fault indicator lamp in series;
an eighth branch: a power indicator lamp is arranged independently;
a ninth branch: the coil of the intermediate relay KA7 is connected with the operation lamp in parallel, N2 is connected with output terminals MA and M1 of the frequency converter, L22 is connected with one end of the coil of the intermediate relay KA7, and the other end of KA7 is connected with output terminals MC and M2 of the frequency converter;
the working power supply is supplied to the DC24V direct current power supply through L22 and N2, the output end of the DC24V direct current power supply is connected with the tenth branch circuit to supply power to the tenth branch circuit:
a tenth branch: the coil of the intermediate relay KA6 is connected to the inverter output terminals P2 and PC.
Further, the manual start button SB1 is a manual start button, and the automatic start button SB10 is an automatic start button.
Further, the intermediate relay KA1 is a manual starting relay; the intermediate relay KA2 is an automatic start relay.
Compared with the prior art, the utility model discloses an air-blower activestandby oil pump switches control circuit's advantage as follows:
1. the frequency converter is additionally arranged in the traditional main loop, and the corresponding control loop is additionally arranged, so that the electric oil pump motor can be quickly started when the oil pressure is reduced and the longer halt time is needed during switching, the phenomenon that the unit is stopped when the main oil pump and the standby oil pump are switched to cause the unit to be restarted is avoided, the influence on the whole process system is caused, and the switching time after the start of the unit is finished is shortened.
2. Because the frequency converter is added in the main loop, the utility model has the advantages of oil pump motor overload protection, open-phase protection, low voltage, overvoltage, etc.; there are current display, voltage display, etc.; accelerating start, decelerating stop, automatic or manual disconnection and searching start; the manpower is reduced, the operating personnel can conveniently control the switching process of the main and standby oil pumps, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of an electrical main circuit of the present invention;
fig. 2 is a secondary electrical schematic diagram of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed Description
According to the technical scheme, the utility model discloses an air-blower main oil pump switches control circuit, include the main loop and the control circuit who is connected with the main loop. Wherein:
as shown in fig. 1, the main loop consists of a low-voltage circuit breaker QF1, a contactor KM, a motor cooling fan, an oil pump motor and a frequency converter; wherein, three-phase four-wire system power (L1 phase, L2 phase, L3 phase, zero line N) are connected with three upper ports of the low-voltage breaker QF1 respectively, and three lower ports (L11, L12, L13) of the low-voltage breaker QF1 are connected with three upper ports of the contactor KM; three lower ports (U1, V1 and W1) of the contactor KM are respectively connected with an input end (R, S, T) of a frequency converter and a motor cooling fan, and an output end (U, V, W) of the frequency converter is connected with an oil pump motor.
In the main loop, a low-voltage circuit breaker QF1 is used for cutting off a main loop power supply; the contactor KM is used for providing a controllable power supply for the frequency converter; the motor cooling fan is used for forcibly cooling the oil pump motor after long-time speed reduction; the oil pump motor is used for supplying oil before the main oil path and the standby oil path are switched; the frequency converter is used for controlling the variable speed operation of the oil pump motor and prolonging the time for switching the main oil circuit and the standby oil circuit.
In the scheme, a frequency converter is added on the main loop, so that the utility model has the advantages of oil pump motor overload protection, open-phase protection, low voltage, overvoltage and the like; there are current display, voltage display, etc.; accelerating start, decelerating stop, automatic or manual disconnection and searching start; the manpower is reduced, the operating personnel can conveniently control the switching process of the main and standby oil pumps, and the working efficiency is improved.
Preferably, the frequency converter is a Siemens G120 frequency converter.
Preferably, the three-phase four-wire power supply is an ac 50HZ 380V three-phase four-wire power supply, and is composed of an L1 phase, an L2 phase, an L3 phase, and a neutral line N.
As shown in fig. 1 and 2, the control circuit comprises a micro-break switch QF2, a remote local transfer switch SA1, a manual start button SB1, an automatic start button SB10, a self-locking stop button SB2, a remote stop button SB20, a fault indicator lamp, a power indicator lamp, an operation lamp, a direct current DC24V power supply, intermediate relays KA1, KA2, KA3, KA4, KA5, KA6 and KA 7. Wherein:
the input end of the micro-break switch QF2 is connected with a zero line N and an L1 phase of a three-phase four-wire system power supply, the outputs L22 and N2 of the micro-break switch QF2 provide a working power supply for the whole secondary circuit, and ten branches are connected in parallel between L22 and N2:
a first branch: the manual mode of the transfer switch SA1 is connected in series with the manual start button SB1, the manual start button SB1 is connected in series with the coil of the intermediate relay KA 1;
a second branch circuit: the automatic mode of the changeover switch SA1 is connected in series with the automatic start button SB10, the automatic start button SB10 is connected in series with the coil of the intermediate relay KA 2;
a third branch circuit: an output normally closed contact of the intermediate relay KA5 is connected in series with a normally open contact of the contactor KM, a normally open contact of the intermediate relay KA1 and a contact of the intermediate relay KA2 in parallel, then connected in series with a normally closed contact of the intermediate relay KA7 and then connected in series with a coil of the contactor KM;
a fourth branch: a normally closed contact of the intermediate relay KA4 is connected with a normally open contact of the contactor KM in series and then connected with a coil of the intermediate relay KA3 in series;
a fifth branch circuit: a normally closed contact of the intermediate relay KA5 is connected in series with the manual self-locking stop button SB2 and the automatic self-locking stop button SB20 in parallel, then is connected in series with a normally open contact of the contactor KM, and then is connected in series with a coil of the intermediate relay KA 4;
a sixth branch: a normally open contact of the intermediate relay KA4 is connected in series with a normally open contact of the intermediate relay KA6 and then connected in series with a coil of the intermediate relay KA 5;
a seventh branch: a normally open contact of the intermediate relay KA7 is connected with the fault indicator lamp in series;
an eighth branch: a power indicator lamp is arranged independently;
a ninth branch: the coil of the intermediate relay KA7 is connected with the operation lamp in parallel, N2 is connected with output terminals MA and M1 of the frequency converter, L22 is connected with one end of the coil of the intermediate relay KA7, and the other end of KA7 is connected with output terminals MC and M2 of the frequency converter;
the working power supply is supplied to the DC24V direct current power supply through L22 and N2, the output end of the DC24V direct current power supply is connected with the tenth branch circuit to supply power to the tenth branch circuit:
a tenth branch: the coil of the intermediate relay KA6 is connected to the inverter output terminal P2 and PC.
Wherein, the change-over switch SA1 switches between a manual mode and an automatic mode, and the manual starting button SB1 is a manual starting button; the automatic start button SB10 is an automatic start button, namely an automatic start signal from an upper computer; the intermediate relay KA1 is a manual starting relay; the intermediate relay KA2 is an automatic starting relay; a contactor KM of the third branch circuit provides an action condition for a coil of a fourth loop intermediate relay KA 3; the contact of the intermediate relay KA3 is connected with the input point (S1 and SC) of the frequency converter to provide an action (running and stopping) instruction for the frequency converter; the intermediate relay KA4 is used as a shutdown switching relay; the intermediate relay KA5 is an extension circuit of the time delay intermediate relay KA 6; the intermediate relay KA6 is a switching delay relay; the intermediate relay KA7 is a fault relay, and when the frequency converter is in fault, the power supply of the whole circuit is cut off, so that the reliable operation of the whole unit is ensured.
The utility model discloses a circuit is used for vapour to drag start process and the switching process of air-blower system, and these two processes can all adopt two kinds of modes to control: manual mode and automatic mode.
The control method of the starting process comprises the following steps:
in the manual mode: the remote local transfer switch SA1 is switched to a first branch circuit, a start button SB1 acts, a self-locking stop button SB2 automatically resets, a coil of an intermediate relay KA1 is electrified, an output contact of the intermediate relay KA1 is connected to a coil of a contactor KM, an output contact of the contactor KM is connected to a coil of an intermediate relay KA3, an output contact of an intermediate relay KA3 is connected to a frequency converter start terminal (S1 and SC) after electrification, a circuit of a control oil pump starts to work, the frequency converter starts to accelerate, an oil pump motor runs, and a power indicator lamp is lightened.
In the automatic mode: the remote local change-over switch SA1 is switched to a second branch circuit, an automatic starting button SB10 is started to act, then the self-locking stop button SB20 is automatically reset, a coil of the intermediate relay KA2 is electrified, an output contact of the intermediate relay KA2 is connected to a coil of the contactor KM, an output contact of the contactor KM is connected to a coil of the intermediate relay KA3, an output contact of the intermediate relay KA3 is connected to a frequency converter starting terminal (S1 and SC) after electrification, a circuit of the control oil pump starts to work, the frequency converter starts to accelerate, an oil pump motor runs, and a power indicator lamp is lightened.
The control method of the switching process after successful start-up comprises the following steps:
manual switching mode: closing a self-locking stop button SB2, electrifying a coil of an intermediate relay KA4, respectively outputting two output contacts of the intermediate relay KA4 to coil circuits of the intermediate relays KA3 and KA5, electrifying the coil of the intermediate relay KA3, disconnecting the output contacts, and reducing the speed of the frequency converter until the frequency converter is stopped; after the main oil pump of the standby group is stably switched, the coil of the intermediate relay KA6 is electrified, so that the output contact of the intermediate relay KA6 is closed, the coil of the intermediate relay KA5 is electrified, the output contact of the intermediate relay KA5 is disconnected, the coil of the contactor KM is electrified, the whole circuit stops working, the power indicator lights are turned off, and the switching is completed.
Automatic switching mode: the self-locking stop signal SB20 is closed, the coil of the intermediate relay KA4 is electrified, two output contacts of the intermediate relay KA4 are respectively output to the coil circuits of the intermediate relays KA3 and KA5, the coil of the intermediate relay KA3 is electrified, the output contacts are disconnected, the frequency converter starts to reduce the speed until the oil pump motor is stopped, the frequency converter is electrified, the coil of the intermediate relay KA6 is electrified to enable the output contact of the intermediate relay KA6 to be closed, the coil of the intermediate relay KA5 is electrified, the output contact of the intermediate relay KA5 is disconnected, the coil of the contactor KM is electrified, the whole circuit stops working, the power indicator lamp is turned off, and switching is completed.
Further, in the speed reduction process of the frequency converter in the manual or automatic switching process, if the oil pressure of the steam-driven blower system is reduced to a set alarm value, the upper computer sends a starting instruction to the frequency converter, or sends a frequency converter starting instruction manually, the interior of the frequency converter executes a search starting function, and the frequency converter starts to start quickly again at the current speed, and the quick starting can be set to be 3 seconds. The restarting mode can effectively improve the oil pressure of the air blower system, ensure that the unit of the air blower system is not stopped, and save manpower.
In the starting and switching process, the intermediate relay KA7 is used for fault monitoring, when a frequency converter has a fault, a coil of the intermediate relay KA7 is electrified, and normally open and normally closed contacts which are output are respectively connected with a contactor KM loop and a fault indicator lamp loop, so that the safe operation of the equipment is ensured, and a maintenance thought is provided for maintenance of maintenance personnel.
The working principle of the utility model is as follows:
the main effect of converter is in the activestandby oil pump switching process, makes the electric oil pump have than long down time, and in the stopping process, steadily reduces the operating speed of electric oil pump, when the main oil pump pressure satisfies unit operating pressure, the electric oil pump stop work, and the main oil pump steadily works. And in the shutdown process, when the pressure of the unit is reduced to the alarm pressure, the frequency converter can quickly start the oil pump, so that the oil pressure of the unit is stable, and the unit can normally run.
The switching control circuit of the main oil pump of the blower has the functions of overload protection, phase failure protection, low voltage, overvoltage and the like of the oil pump motor; there are current display, voltage display, etc.; deceleration parking, quick starting and searching starting functions; the oil pump switching device has the advantages of simple operation, stable switching and labor saving, and achieves the purpose of stably switching the main oil pump and the standby oil pump of the unit.
Claims (5)
1. A main oil pump switching control circuit of a blower comprises a main loop and a control loop connected with the main loop, wherein the main loop consists of a low-voltage circuit breaker QF1, a contactor KM, a motor cooling fan and an oil pump motor, and is characterized by further comprising a frequency converter; the three-phase four-wire system power supply is respectively connected with three upper ports of a low-voltage circuit breaker QF1, and three lower ports L11, L12 and L13 of the low-voltage circuit breaker QF1 are connected with three upper ports of the contactor KM; three lower ports U1, V1 and W1 of the contactor KM are respectively connected with an input end R, S, T of a frequency converter and the motor cooling fan, and an output end U, V, W of the frequency converter is connected with the oil pump motor.
2. The blower main oil pump switching control circuit as set forth in claim 1, wherein said inverter is a siemens G120 inverter.
3. The blower main oil pump shift control circuit as set forth in claim 1, wherein said control circuit includes a micro-break switch QF2, a remote local transfer switch SA1, a manual start button SB1, an automatic start button SB10, a self-locking stop button SB2, a remote stop button SB20, a fault indicator lamp, a power indicator lamp, an operation lamp, a direct current DC24V power supply, an intermediate relay KA1, KA2, KA3, KA4, KA5, KA6, and KA 7; wherein:
the input end of the micro-disconnecting switch QF2 is connected with a zero line N and an L1 phase of the three-phase four-wire system power supply, the outputs L22 and N2 of the micro-disconnecting switch QF2 provide a working power supply for the whole secondary circuit, and ten branches are connected in parallel between L22 and N2:
a first branch: the manual mode of the transfer switch SA1 is connected in series with the manual start button SB1, the manual start button SB1 is connected in series with the coil of the intermediate relay KA 1;
a second branch circuit: the automatic mode of the changeover switch SA1 is connected in series with the automatic start button SB10, the automatic start button SB10 is connected in series with the coil of the intermediate relay KA 2;
a third branch circuit: an output normally closed contact of the intermediate relay KA5 is connected in series with a normally open contact of the contactor KM, a normally open contact of the intermediate relay KA1 and a contact of the intermediate relay KA2 in parallel, then connected in series with a normally closed contact of the intermediate relay KA7 and then connected in series with a coil of the contactor KM;
a fourth branch: a normally closed contact of the intermediate relay KA4 is connected with a normally open contact of the contactor KM in series and then connected with a coil of the intermediate relay KA3 in series;
a fifth branch circuit: a normally closed contact of the intermediate relay KA5 is connected in series with the manual self-locking stop button SB2 and the automatic self-locking stop button SB20 in parallel, then is connected in series with a normally open contact of the contactor KM, and then is connected in series with a coil of the intermediate relay KA 4;
a sixth branch: a normally open contact of the intermediate relay KA4 is connected in series with a normally open contact of the intermediate relay KA6 and then connected in series with a coil of the intermediate relay KA 5;
a seventh branch: a normally open contact of the intermediate relay KA7 is connected with the fault indicator lamp in series;
an eighth branch: a power indicator lamp is arranged independently;
a ninth branch: the coil of the intermediate relay KA7 is connected with the operation lamp in parallel, N2 is connected with output terminals MA and M1 of the frequency converter, L22 is connected with one end of the coil of the intermediate relay KA7, and the other end of KA7 is connected with output terminals MC and M2 of the frequency converter;
the working power supply is supplied to the DC24V direct current power supply through L22 and N2, the output end of the DC24V direct current power supply is connected with the tenth branch circuit to supply power to the tenth branch circuit:
a tenth branch: the coil of the intermediate relay KA6 is connected to the inverter output terminals P2 and PC.
4. The blower main oil pump switching control circuit as set forth in claim 3, wherein said manual start button SB1 is a manual start button, and said automatic start button SB10 is an automatic start button.
5. The blower main oil pump switching control circuit as set forth in claim 3, wherein said intermediate relay KA1 is a manual start relay; the intermediate relay KA2 is an automatic start relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921338137.2U CN210724619U (en) | 2019-08-16 | 2019-08-16 | Switching control circuit for main oil pump of air blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921338137.2U CN210724619U (en) | 2019-08-16 | 2019-08-16 | Switching control circuit for main oil pump of air blower |
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| CN210724619U true CN210724619U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921338137.2U Active CN210724619U (en) | 2019-08-16 | 2019-08-16 | Switching control circuit for main oil pump of air blower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474595A (en) * | 2019-08-16 | 2019-11-19 | 西安陕鼓动力股份有限公司 | A kind of air blower main oil pump control switching circuit and booting, method for handover control |
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2019
- 2019-08-16 CN CN201921338137.2U patent/CN210724619U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474595A (en) * | 2019-08-16 | 2019-11-19 | 西安陕鼓动力股份有限公司 | A kind of air blower main oil pump control switching circuit and booting, method for handover control |
| CN110474595B (en) * | 2019-08-16 | 2024-06-25 | 西安陕鼓动力股份有限公司 | Switching control circuit and starting-up and switching control method for main oil pump of blower |
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