CN202042882U - Circuit capable of realizing variable-frequency speed regulation and temperature protection circuit to fan - Google Patents
Circuit capable of realizing variable-frequency speed regulation and temperature protection circuit to fan Download PDFInfo
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- CN202042882U CN202042882U CN2011201598156U CN201120159815U CN202042882U CN 202042882 U CN202042882 U CN 202042882U CN 2011201598156 U CN2011201598156 U CN 2011201598156U CN 201120159815 U CN201120159815 U CN 201120159815U CN 202042882 U CN202042882 U CN 202042882U
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- frequency motor
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- Control Of Electric Motors In General (AREA)
Abstract
The utility model relates to a circuit, in particular to a circuit capable of realizing variable-frequency speed regulation and temperature protection to an axial-flow fan. The circuit comprises a variable-frequency motor control circuit, a fan control circuit, a temperature control circuit, and an alarm indication circuit. By adopting the circuit, a machine can automatically stop when the temperature of the variable-frequency motor is lowered to the lower limit after the variable-frequency motor stops, realizing automatic control and eliminating manual operation, further, the damage to windings due to quick temperature rise because a fan stops running when the variable frequency motor stops is prevented.
Description
Technical field
The utility model relates to a kind of circuit, relates in particular to a kind of circuit of realizing axial flow blower frequency control and temperature protection.
Background technology
Existing variable-frequency motor uses blower fan to carry out air blast cooling.Though the axial flow blower of import has advantages such as quiet, that the life-span is long, wind-force is strong.But the ventilation noise of air blast cooling is still very big, not environmental protection.Life-span, long the representative never damaged, and the life-span of axial flow blower is certain.And axial flow blower or stop together after variable-frequency motor stops, or, can not realize automatic control by manually stopping.When the motor of axial flow blower hinders when stopping for some reason, variable-frequency motor can't cool off.Can cause the temperature fast rise like this, when maximum temperature is damaged because of the unprotect measure later.
Summary of the invention
The purpose of this utility model just provides and a kind ofly can realize the operation of variable frequency adjustment axial flow blower and stop, thereby the velocity of rotation of Control Shaft flow fan reaches and reduces ventilation noise and saves energy, can also realize protecting simultaneously the purpose of variable-frequency motor.
The technical scheme that the utility model provides is:
Fan frequency conversion speed governing and temperature protection circuit, contactor KM1 and variable-frequency motor are connected in series, and are connected with power supply; Contactor KM2 and blower fan are connected in series, and are connected with power supply; The auxiliary contact KM3-1 of temperature upper limit relay K M3, variable-frequency motor stop button SB1, variable-frequency motor start button SB2 and contactor KM1 series connection, the auxiliary contact KM1-1 of contactor KM1 is in parallel with variable-frequency motor start button SB2, is connected with power supply at last; KM4-1 is in parallel with the auxiliary contact KM1-2 of contactor KM1 for lowest temperature relay K M4 auxiliary contact, and connected in series with contactor KM2, is connected with power supply at last; Intelligent digital measuring and controlling instrument XMT high temperature contact switch is connected with temperature upper limit relay K M3; Intelligent digital measuring and controlling instrument XMT low temperature contact switch is connected with lowest temperature relay K M4; The auxiliary contact KM3-2 of temperature upper limit relay K M3 is connected with alarm lamp EL1, is connected with power supply at last, and alarm lamp EL1 is in parallel with alarm HA; The auxiliary contact KM2-1 of contactor KM2 is connected with fan starting indicator light EL2, is connected with power supply at last; Auxiliary contact KM2-2 and the blower fan of contactor KM2 stops indicator light EL3 and is connected, and links to each other with power supply at last; The temperature sensor that is installed on the variable-frequency motor is connected with intelligent digital measuring and controlling instrument XMT.
Preferably; variable-frequency motor also is in series with variable-frequency motor overload protective device FR1; the auxiliary contact KM3-1 of temperature upper limit relay K M3, variable-frequency motor overload protective device FR1-1, variable-frequency motor stop button SB1, variable-frequency motor start button SB2 and contactor KM1 series connection; the auxiliary contact KM1-1 of contactor KM1 is in parallel with variable-frequency motor start button SB2, is connected with power supply at last.
Preferably, blower fan is also connected in series a blower fan overload protective device FR2.
Preferably, blower fan is also connected in series frequency converter, and frequency converter is connected with intelligent digital measuring and controlling instrument XMT.
The utility model is made up of variable-frequency motor control circuit, draught fan control circuit, temperature-control circuit, warning indicating circuit etc.The utility model can be implemented in variable-frequency motor stop after, the variable-frequency motor temperature drops to autostop when setting lower limit temperature, realizes that control need not manual operation automatically.Thereby prevent that variable-frequency motor from shutting down and cause temperature to raise to the damage of winding fast shutting down rear fan.
The utility model can also be realized the rotating speed and the ventilation quantity of control blower fan automatically by the control of conversion device.Frequency raises when the variable-frequency motor temperature is high, and ventilation quantity increases; Frequency reduced ventilation quantity decline when temperature was low, had realized reducing the purpose of ventilation noise and saves energy simultaneously.
The utility model is simple in structure, is convenient to transform existing equipment.
Description of drawings
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the structural representation of embodiment 2.
Three phase mains (L1, L2, L3);
N---ground wire;
QS---main switch;
FU1, FU2---major loop fuse;
FU3---control loop fuse;
KM1---contactor KM1;
KM2---contactor KM2
KM3---temperature upper limit relay;
KM4---lowest temperature relay;
FR1---variable-frequency motor overload protective device;
FR2---blower fan overload protective device;
M1---variable-frequency motor;
M2---blower fan;
KM1-1,2,3---the auxiliary contact of contactor KM1;
KM2-1---the auxiliary contact of contactor KM2;
KM3-1---temperature upper limit relay K M3 auxiliary contact;
KM4-1---lowest temperature relay K M4 auxiliary contact;
SB1---variable-frequency motor stop button;
SB2---variable-frequency motor start button;
FR1-1---variable-frequency motor overload protection auxiliary contact;
FR2-1---blower fan overload protection auxiliary contact;
EL1---alarm lamp;
EL2---fan starting indicator light;
EL3---blower fan stops indicator light;
HA---alarm; XMT---intelligent digital measuring and controlling instrument.
Embodiment
As shown in Figure 1, blower fan M2 connects three phase mains (L1, L2, L3) by blower fan overload protective device FR2, contactor KM2, major loop fuse FU2 and main switch QS.Variable-frequency motor M1 connects three power supplys (L1, L2, L3) by variable-frequency motor overload protective device FR1, contactor KM1, major loop fuse FU1 and main switch QS.Being installed in variable-frequency motor is connected with intelligent digital measuring and controlling instrument XMT with temperature sensor on the blower fan
The auxiliary contact KM3-1 of temperature upper limit relay K M3, variable-frequency motor overload protective device auxiliary contact FR1-1, variable-frequency motor stop button SB1, variable-frequency motor start button SB2 and contactor KM1 series connection; the auxiliary contact KM1-1 of contactor KM1 is in parallel with variable-frequency motor start button SB2, is connected with L1 and ground wire N at last.KM4-1 is in parallel with the auxiliary contact KM1-2 of contactor KM1 for temperature upper limit relay K M4 auxiliary contact, and connected in series with contactor KM2, is connected with L1 and ground wire N at last.Intelligent digital measuring and controlling instrument XMT high temperature contact switch is connected with temperature upper limit relay K M3, is connected with L1 and ground wire N at last.Intelligent digital measuring and controlling instrument XMT low temperature contact switch is connected with lowest temperature relay K M4, is connected with L1 and ground wire N at last.The auxiliary contact KM3-2 of temperature upper limit relay K M3 is connected with alarm lamp EL1, is connected with L1 and ground wire N at last, and alarm lamp EL1 is in parallel with alarm HA.The auxiliary contact KM2-1 of contactor KM2 is connected with fan starting indicator light EL2, is connected with L1 and ground wire N at last.Auxiliary contact KM2-2 and the blower fan of contactor KM2 stops indicator light EL3 and is connected, and is connected with L1 and ground wire N at last.
Being installed in variable-frequency motor is connected with intelligent digital measuring and controlling instrument XMT with temperature sensor on the blower fan.
Main switch QS closure, after the variable-frequency motor start button SB2 closure, contactor KM1 closure, the auxiliary contact KM1-1 of contactor KM1,2 closures, contactor KM2 closure, the auxiliary contact KM2-1 closure of contactor KM2, the auxiliary contact KM2-2 of contactor KM2 opens.Fan starting indicator light EL2 brightens, and blower fan stops indicator light EL3 and extinguishes.Variable-frequency motor M1 and blower fan M2 running.
If when the temperature of variable-frequency motor M1 was in the normal temperature range, then blower fan M1 ran well.
When the temperature of variable-frequency motor M1 is higher than normal temperature, intelligent digital measuring and controlling instrument XMT high temperature contact switch closure, temperature upper limit relay K M3 closure, the auxiliary contact KM3-1 of temperature upper limit relay K M3 opens, contactor KM1 opens, and variable-frequency motor M1 shuts down.The auxiliary contact KM3-2 closure of temperature upper limit relay K M3, alarm lamp EL1 reports to the police glittering, and alarm HA blows a whistle.
When the temperature subnormal temperature of variable-frequency motor M1, intelligent digital measuring and controlling instrument XMT low temperature contact switch closure, lowest temperature relay K M4 closure, the auxiliary contact KM4-1 of lowest temperature relay K M4 opens, and the auxiliary contact point KM1-2 of contactor KM1 opens, this moment, contactor KM2 opened, the auxiliary contact KM2-1 of contactor KM2 opens, the auxiliary contact KM2-2 closure of contactor KM2, and blower fan M2 shuts down, fan starting indicator light EL2 extinguishes, and blower fan stops indicator light EL3 and brightens.
As different from Example 1: blower fan is also connected in series frequency converter, and frequency converter is connected with intelligent digital measuring and controlling instrument XMT.
Utilize the current signal of intelligent digital measuring and controlling instrument XMT to export the control of conversion device, realize controlling automatically the rotating speed and the ventilation quantity of blower fan by the variable-frequency motor temperature.Frequency rising, ventilation quantity increase when the variable-frequency motor temperature is high; Frequency reduction, ventilation quantity descended when temperature was low, thereby realized reducing the purpose of ventilation noise and saves energy.For example: in the variable-frequency motor temperature is that the current signal of 60 measuring and controlling instrument of intelligent digital when the spending XMT outputs unit frequency of keeping watch is adjusted to 30 hertz automatically, and the ventilation quantity of this moment is less, and the ventilation noise is also lower, and power consumption is low during also than full speed running.The current signal that reaches 100 measuring and controlling instrument of intelligent digital when spending XMT outputs when temperature is that the 16MA unit frequency of keeping watch is adjusted to 45 hertz automatically, and the ventilation quantity of this moment is bigger, and the ventilation noise is also bigger.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (4)
1. fan frequency conversion speed governing and temperature protection circuit is characterized in that, contactor KM1 and variable-frequency motor are connected in series, and are connected with power supply; Contactor KM2 and blower fan are connected in series, and are connected with power supply; The auxiliary contact KM3-1 of temperature upper limit relay K M3, variable-frequency motor stop button SB1, variable-frequency motor start button SB2 and contactor KM1 series connection, the auxiliary contact KM1-1 of contactor KM1 is in parallel with variable-frequency motor start button SB2, is connected with power supply at last; KM4-1 is in parallel with the auxiliary contact KM1-2 of contactor KM1 for lowest temperature relay K M4 auxiliary contact, and connected in series with contactor KM2, is connected with power supply at last; Intelligent digital measuring and controlling instrument XMT high temperature contact switch is connected with temperature upper limit relay K M3; Intelligent digital measuring and controlling instrument XMT low temperature contact switch is connected with lowest temperature relay K M4; The auxiliary contact KM3-2 of temperature upper limit relay K M3 is connected with alarm lamp EL1, is connected with power supply at last, and alarm lamp EL1 is in parallel with alarm HA; The auxiliary contact KM2-1 of contactor KM2 is connected with fan starting indicator light EL2, is connected with power supply at last; Auxiliary contact KM2-2 and the blower fan of contactor KM2 stops indicator light EL3 and is connected, and links to each other with power supply at last; The temperature sensor that is installed in variable-frequency motor is connected with intelligent digital measuring and controlling instrument XMT.
2. according to described fan frequency conversion speed governing of claim 1 and temperature protection circuit; it is characterized in that; variable-frequency motor also is in series with variable-frequency motor overload protective device FR1; the auxiliary contact KM3-1 of temperature upper limit relay K M3, variable-frequency motor overload protective device FR1-1, variable-frequency motor stop button SB1, variable-frequency motor start button SB2 and contactor KM1 series connection; the auxiliary contact KM1-1 of contactor KM1 is in parallel with variable-frequency motor start button SB2, is connected with power supply at last.
3. according to described fan frequency conversion speed governing of claim 1 and temperature protection circuit, it is characterized in that blower fan is also connected in series blower fan overload protective device FR2.
4. according to described fan frequency conversion speed governing of claim 1 and temperature protection circuit, it is characterized in that blower fan is also connected in series frequency converter, frequency converter is connected with XMT intelligent digital measuring and controlling instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201598156U CN202042882U (en) | 2011-05-19 | 2011-05-19 | Circuit capable of realizing variable-frequency speed regulation and temperature protection circuit to fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201598156U CN202042882U (en) | 2011-05-19 | 2011-05-19 | Circuit capable of realizing variable-frequency speed regulation and temperature protection circuit to fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202042882U true CN202042882U (en) | 2011-11-16 |
Family
ID=44970307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201598156U Expired - Fee Related CN202042882U (en) | 2011-05-19 | 2011-05-19 | Circuit capable of realizing variable-frequency speed regulation and temperature protection circuit to fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202042882U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939376A (en) * | 2014-04-28 | 2014-07-23 | 王敏 | Intelligent draught fan centralized-control box for power grid |
| CN104020798A (en) * | 2014-06-25 | 2014-09-03 | 江苏海迅实业集团股份有限公司 | Temperature controller with over-temperature alarm signal output |
| CN104895820A (en) * | 2015-07-02 | 2015-09-09 | 东方日立(成都)电控设备有限公司 | Energy-saving optimization control method of moving-blade-adjustable axial flow fan variable-frequency energy-saving system |
| CN107366633A (en) * | 2017-08-16 | 2017-11-21 | 南通中船机械制造有限公司 | A kind of pressurized tank pump control unit based on motor speed |
| CN111271303A (en) * | 2020-01-22 | 2020-06-12 | 西安陕鼓通风设备有限公司 | Oil station electric control system, ventilator unit control system and control method |
| CN112928734A (en) * | 2021-01-12 | 2021-06-08 | 中国石油天然气股份有限公司 | Motor temperature protection control system and method for high-pressure water injection pump |
-
2011
- 2011-05-19 CN CN2011201598156U patent/CN202042882U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939376A (en) * | 2014-04-28 | 2014-07-23 | 王敏 | Intelligent draught fan centralized-control box for power grid |
| CN104020798A (en) * | 2014-06-25 | 2014-09-03 | 江苏海迅实业集团股份有限公司 | Temperature controller with over-temperature alarm signal output |
| CN104895820A (en) * | 2015-07-02 | 2015-09-09 | 东方日立(成都)电控设备有限公司 | Energy-saving optimization control method of moving-blade-adjustable axial flow fan variable-frequency energy-saving system |
| CN107366633A (en) * | 2017-08-16 | 2017-11-21 | 南通中船机械制造有限公司 | A kind of pressurized tank pump control unit based on motor speed |
| CN107366633B (en) * | 2017-08-16 | 2019-09-03 | 南通中船机械制造有限公司 | A kind of pressurized tank pump control unit based on motor speed |
| CN111271303A (en) * | 2020-01-22 | 2020-06-12 | 西安陕鼓通风设备有限公司 | Oil station electric control system, ventilator unit control system and control method |
| CN111271303B (en) * | 2020-01-22 | 2021-01-01 | 西安陕鼓通风设备有限公司 | Oil station electric control system, ventilator unit control system and control method |
| CN112928734A (en) * | 2021-01-12 | 2021-06-08 | 中国石油天然气股份有限公司 | Motor temperature protection control system and method for high-pressure water injection pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20130519 |