CN214314536U - Motor protection circuit for fan - Google Patents
Motor protection circuit for fan Download PDFInfo
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- CN214314536U CN214314536U CN202120369656.6U CN202120369656U CN214314536U CN 214314536 U CN214314536 U CN 214314536U CN 202120369656 U CN202120369656 U CN 202120369656U CN 214314536 U CN214314536 U CN 214314536U
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- contactor
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- protection circuit
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Abstract
The utility model provides a motor protection circuit for fan, belong to the protection circuit technical field of motor work, it includes the motor, the contactor, a power supply, stop switch, starting switch, the contactor coil, second relay and first relay, the motor passes through the contactor and is connected with the power electricity, first relay is connected with the U of motor, the second relay is connected with the V of motor, first relay contact on the first relay, the second relay contact on the second relay, stop switch, starting switch and contactor coil are from going to back series connection in proper order, and first relay contact on the first relay is connected with the W of motor, the first normally open contact of contactor contact on the contactor coil and starting switch parallel connection. Through the utility model discloses a motor protection circuit for fan can keep the three-phase balance of motor, ensures dust exhausting fan's the permanent steady operation of motor.
Description
Technical Field
The utility model relates to a protection circuit technical field of motor work specifically is a motor protection circuit for fan.
Background
The blower for dedusting and cooling tail gas generated by burning lime causes frequent kiln shutdown and maintenance due to frequent burning out of the motor, and the main reason is that the motor is burnt out due to the phase loss of a power supply for the motor as discovered by field maintenance and analysis. Referring to fig. 1, a conventional motor control loop power supply is one phase of an optional three-phase power supply, when voltages of other two-phase power supplies fail and the control loop power supply is normal, a contactor is normally closed, the motor is burnt due to unbalance of the three-phase power supply of the motor, equipment is damaged by a light person, and an accident is caused by a heavy person.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned tail gas dust removal, refrigerated fan that is used for lime to fire because the motor burns out the problem that leads to frequent kiln stopping maintenance often, the utility model provides a motor protection circuit for fan, it is the U of original motor looks and V and goes up the connection relay, and the W through relay contact control motor looks in time breaks off when U looks and V looks break down, protects the motor. The specific technical scheme is as follows:
a motor protection circuit for fan, including motor, contactor, power, stop switch, starting switch, contactor coil, second relay and first relay, the motor passes through the contactor and is connected with the power electricity, first relay is connected with the U of motor, the second relay is connected with the V of motor, first relay contact on the first relay, the second relay contact on the second relay, stop switch, starting switch and contactor coil are from going to back series connection in proper order, just first relay contact on the first relay is connected with the W of motor, the first normally open contact of contactor contact on the contactor coil and starting switch parallel connection.
The motor protection circuit for the fan further comprises a thermal overload protector, the thermal overload protector is connected between the motor and the contactor, and a contact of the thermal overload protector on the thermal overload protector is connected between the starting switch and the contactor coil.
The motor protection circuit for the fan further comprises a circuit breaker, wherein the circuit breaker is connected between the contactor and the power supply, the second relay and the first relay are connected between the circuit breaker and the contactor, the U-phase of the motor is connected with the N of the motor through the first relay, and the V-phase of the motor is connected with the N of the motor through the second relay.
The motor protection circuit for a blower described above further includes a fuse connected between the W phase of the motor and the first relay contact.
The motor protection circuit for the fan further comprises an emergency stop switch, and the emergency stop switch is connected between the fuse and the first relay contact.
The motor protection circuit for the fan further comprises an indicating branch circuit, the indicating branch circuit is connected between the first relay contact and the contactor coil in parallel, the indicating branch circuit comprises an indicating lamp and a contact of the contactor coil, and the contact of the contactor coil is connected with the indicating lamp in series.
The motor protection circuit for the fan further comprises a dust removal fan, and the dust removal fan is connected with the power output end of the motor.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a motor protection circuit for fan, it includes the motor, the contactor, a power supply, stop switch, starting switch, the contactor coil, second relay and first relay, the motor passes through the contactor and is connected with the power electricity, first relay is connected with the U of motor, the second relay is connected with the V of motor, first relay contact on the first relay, the second relay contact on the second relay, stop switch, starting switch and contactor coil are from going to back series connection in proper order, first relay contact on the first relay is connected with the W of motor, the first normally open contact of contactor contact on the contactor coil and starting switch parallel connection. The utility model discloses a motor protection circuit for fan when the U of motor looks and/or V looks break down, first relay and/or second relay outage, the disconnection of first relay contact and/or second relay contact that is connected with the W of motor through first relay and/or second relay control, the W of motor also cuts off the power supply promptly this moment mutually, and the three-phase is cut off the power supply simultaneously, keeps the three-phase balance of motor, protects the motor, prevents the motor burnout. And meanwhile, the motor of the dust removal fan can be ensured to stably run for a long time.
Drawings
FIG. 1 is a circuit diagram of a prior art motor circuit for a blower;
fig. 2 is a circuit diagram of a motor protection circuit for a fan according to the present invention;
the system comprises a motor, a thermal overload protector, a contactor, a circuit breaker, a power supply, a fuse, an emergency stop switch, a first relay contact, a second relay contact, a stop switch, a starting switch, a contactor contact, a normally open contact, a thermal overload protector contact, a contactor coil, a contactor normally closed contact, a contactor normally open contact, a first indicator light, a contactor switch, a starting switch, a contactor switch, a switch and a switch, wherein 1-the motor, the thermal overload protector, the contactor switch, the contactor, the switch, the contactor, the switch.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and examples, but the present invention is not limited to the embodiments explained below.
The utility model discloses a motor protection circuit for fan, including motor 1, contactor 3, power 5, stop switch 10, starting switch 11, contactor coil 14, second relay 19 and first relay 20, motor 1 is connected with power 5 electricity through contactor 3, first relay 20 is connected with motor 1's U, second relay 19 is connected with motor 1's V, first relay contact 8 on the first relay 20, second relay contact 9 on the second relay 19, stop switch 10, starting switch 11 and contactor coil 14 are from going to back series connection in proper order on motor 1's W is mutually, the first normally open contact 12 of contactor contact on contactor coil 14 and starting switch 11 parallel connection.
The motor protection circuit for the fan further comprises a thermal overload protector 2, the thermal overload protector 2 is connected between the motor 1 and the contactor 3, and a thermal overload protector contact 13 on the thermal overload protector 2 is connected between the starting switch 11 and the contactor coil 14.
The motor protection circuit for the blower fan further includes a circuit breaker 4, the circuit breaker 4 is connected between the contactor 3 and the power supply 5, and a second relay 19 and a first relay 20 are connected between the circuit breaker 4 and the contactor 3, the U-phase of the motor 1 is connected to N of the motor 1 through the first relay 20, and the V-phase of the motor 1 is connected to N of the motor 1 through the second relay 19.
The above-described motor protection circuit for a blower fan further includes a fuse 6, and the fuse 6 is connected between the W phase of the motor 1 and the first relay contact 8.
The motor protection circuit for the fan further comprises an emergency stop switch 7, and the emergency stop switch 7 is connected between the fuse 6 and the first relay contact 8.
The motor protection circuit for the fan further comprises an indicating branch circuit, the indicating branch circuit is connected between the first relay contact 8 and the contactor coil 14 in parallel, the indicating branch circuit comprises an indicating lamp and a contact of the contactor coil 14, and the contact of the contactor coil 14 is connected with the indicating lamp in series.
The motor protection circuit for the fan further comprises a dust removal fan, and the dust removal fan is connected with the power output end of the motor 1.
Example 1
Referring to fig. 2, the motor protection circuit of the fan in this embodiment further includes a dust removal fan, which includes a motor 1, a thermal overload protector 2, a contactor 3, a circuit breaker 4, a power supply 5, a fuse 6, an emergency stop switch 7, a stop switch 10, a start switch 11, a contactor coil 14, a second relay 19, a first relay 20, two indication branches and the dust removal fan, where the two indication branches are a first indication branch and a second indication branch, respectively, the first indication branch and the second indication branch are connected in parallel, the first indication branch includes contacts of a first indicator lamp 17 and the contactor coil 14, the contacts are third normally open contacts 16 of the contactor, the first indicator lamp 17 is connected in series with the third normally open contacts 16 of the contactor, and the first indicator lamp 17 is an operation indicator lamp; the second indicating branch comprises a second indicator light 18 and a contact of the contactor coil 14, the contact is a contactor second normally closed contact 15, the second indicator light 18 is connected with the second normally closed contact 15 in series, and the second indicator light 18 is a power indicator light; the dust removal fan is connected with the power output end of the motor 1; the motor 1, the thermal overload protector 2, the contactor 3, the breaker 4 and the power supply 5 are sequentially connected in series from front to back, the first relay 20 is connected with the U of the motor 1, the second relay 19 is connected with the V of the motor 1, the first relay 20 and the second relay 19 are both connected between the breaker 4 and the power supply 5, the U of the motor 1 is connected with the N of the motor 1 through the first relay 20, the V of the motor 1 is connected with the N of the motor 1 through the second relay 19, and the W of the motor 1 is connected with the N of the motor 1 through the fuse 6, the emergency stop switch 7, the first relay contact 8, the second relay contact 9, the stop switch 10, the start switch 11, the thermal overload protector contact 13 and the contactor coil 14 from front to back in sequence; a first relay contact 8 on a first relay 20, a second relay contact 9 on a second relay 19, a stop switch 10, a start switch 11 and a contactor coil 14 are sequentially connected in series from front to back, a contact of the contactor coil 14 is connected with the start switch 11 in parallel, the contact is a first normally open contact 12 of the contactor contact, and a thermal overload protector contact 13 on a thermal overload protector 2 is connected between the start switch 11 and the contactor coil 14 in series; the first indication branch and the second indication branch are connected in parallel between the first relay contact 8 and the contactor coil 14; the fuse 6 is connected with the emergency stop switch 7 in series, the fuse 6 is connected with the W of the motor 1, and the emergency stop switch 7 is connected with the connecting contacts of the first relay contact 8, the first indicating branch and the second indicating branch; the first relay contact 8 and the second relay contact 9 are normally open contacts.
The motor protection circuit of the embodiment further comprises a dust removal fan, and the working principle is as follows: the circuit breaker 4 is closed, the first relay 20 and the second relay 19 are electrified, the first relay contact 8 and the second relay contact 9 are closed, the starting switch 11 is closed, the contactor coil 14 is closed, the contactor contact first normally open contact 12 and the starting switch 11 form parallel connection and self locking, the contactor is closed, the motor operates, and meanwhile, the dust removal fan is driven to work; if the second normally closed contact 15 of the contactor is opened, the power indicator lamp is turned off, and if the third normally open contact 16 of the contactor is closed, the operation indicator lamp is turned on; when the motor is stopped, the stop switch 10 is pressed to cut off the loop power supply of the contactor 3, the three-phase contacts of the contactor 3 are all opened, and the motor 1 stops operating. When the U phase and/or the V phase of the motor 1 have faults, the first relay 20 and/or the second relay 19 are powered off, the first relay contact 8 and/or the second relay contact 9 connected with the W phase of the motor are controlled to be disconnected through the first relay 20 and/or the second relay 19, namely the W phase of the motor 1 is also powered off, the three phases are simultaneously powered off, the three-phase balance of the motor 1 is kept, the motor 1 is protected, and the motor 1 is prevented from being burnt. And meanwhile, the motor of the dust removal fan can be ensured to stably run for a long time.
Claims (7)
1. A motor protection circuit for a fan is characterized by comprising a motor (1), a contactor (3), a power supply (5), a stop switch (10), a start switch (11), a contactor coil (14), a second relay (19) and a first relay (20), wherein the motor (1) is electrically connected with the power supply (5) through the contactor (3), the first relay (20) is connected with a U of the motor (1), the second relay (19) is connected with a V of the motor (1), a first relay contact (8) on the first relay (20), a second relay contact (9) on the second relay (19), the stop switch (10), the start switch (11) and the contactor coil (14) are sequentially connected in series from front to back, and the first relay contact (8) on the first relay (20) is connected with the W of the motor (1), and a first normally open contact (12) of the contactor contact on the contactor coil (14) is connected with the starting switch (11) in parallel.
2. The motor protection circuit for a blower according to claim 1, further comprising a thermal overload protector (2), the thermal overload protector (2) being connected between the motor (1) and the contactor (3), and thermal overload protector contacts (13) on the thermal overload protector (2) being connected between the starter switch (11) and the contactor coil (14).
3. The motor protection circuit for a blower according to claim 2, further comprising a circuit breaker (4), wherein the circuit breaker (4) is connected between the contactor (3) and the power source (5), and the second relay (19) and the first relay (20) are connected between the circuit breaker (4) and the contactor (3), the U-phase of the motor (1) is connected to N of the motor (1) through the first relay (20), and the V-phase of the motor (1) is connected to N of the motor (1) through the second relay (19).
4. The motor protection circuit for a blower according to claim 3, characterized in that it further comprises a fuse (6), said fuse (6) being connected between the W phase of the motor (1) and the first relay contact (8).
5. The motor protection circuit for a blower according to claim 4, characterized in that it further comprises an emergency stop switch (7), said emergency stop switch (7) being connected between the fuse (6) and the first relay contact (8).
6. The motor protection circuit for a fan according to claim 5, further comprising an indication branch connected in parallel between the first relay contact (8) and the contactor coil (14), the indication branch comprising an indication lamp and a contact of the contactor coil (14), the contact of the contactor coil (14) and the indication lamp being connected in series.
7. The motor protection circuit for fans according to any of claims 1 to 6, characterized in that it further comprises a dust removal fan connected to the power take-off of the motor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120369656.6U CN214314536U (en) | 2021-02-10 | 2021-02-10 | Motor protection circuit for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120369656.6U CN214314536U (en) | 2021-02-10 | 2021-02-10 | Motor protection circuit for fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214314536U true CN214314536U (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120369656.6U Active CN214314536U (en) | 2021-02-10 | 2021-02-10 | Motor protection circuit for fan |
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| Country | Link |
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| CN (1) | CN214314536U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945148A (en) * | 2021-10-15 | 2022-01-18 | 衡阳泰豪通信车辆有限公司 | In-place detection circuit and method for vehicle-mounted lifting mechanism |
-
2021
- 2021-02-10 CN CN202120369656.6U patent/CN214314536U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945148A (en) * | 2021-10-15 | 2022-01-18 | 衡阳泰豪通信车辆有限公司 | In-place detection circuit and method for vehicle-mounted lifting mechanism |
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