CN211701092U - Fan power supply circuit - Google Patents
Fan power supply circuit Download PDFInfo
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- CN211701092U CN211701092U CN202020502077.XU CN202020502077U CN211701092U CN 211701092 U CN211701092 U CN 211701092U CN 202020502077 U CN202020502077 U CN 202020502077U CN 211701092 U CN211701092 U CN 211701092U
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- fan
- power supply
- switch
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Abstract
The utility model provides a fan supply circuit, include: the three-phase alternating current power supply is connected with the fan; the execution element is arranged between the three-phase alternating-current power supply and the fan and controls the on-off of the three-phase alternating-current power supply and the fan through switching states; the control circuit comprises a first circuit, a second circuit and a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit or the second circuit in a switching mode, and the output ends of the first circuit and the second circuit are connected with a neutral line after being connected; the first circuit and the second circuit can control the switching state of the actuating element, the first circuit is located in the distribution box, and the single-pole double-throw switch and the second circuit are located in a local control box. When the fan is overhauled, the control of supplying power to the fan can be switched through the single-pole double-throw switch in the local control box, and the safety of maintainers is guaranteed.
Description
Technical Field
The utility model relates to a building electrical technology field especially relates to a fan supply circuit.
Background
The fan is widely applied to ventilation of buildings, and the fan is generally supplied with power by a distribution box through a three-phase alternating current power supply. Because the fan is often installed in the roof of building, generally be far away from the block terminal, even not at the same floor. When the fan breaks down and needs the maintainer to overhaul, personal injury accidents can be brought to the distribution control box due to misoperation of other personnel. In order to avoid the hidden trouble, a local control box is generally required to be arranged beside the fan, an isolating switch is arranged in the local control box, and the isolating switch is used for controlling the on-off of the three-phase alternating-current power supply and the fan. When the fan fault needs to be overhauled by maintainers, the three-phase alternating current power supply can be powered off through the isolating switch in the local control box. However, since the isolating switch is generally connected in series between the three-phase ac power supply and the fan, after the field maintenance is completed, if a test operation is to be performed, the isolating switch must be turned on first, but once the isolating switch is turned on, the possibility of remote control of the distribution box exists, and thus the personal safety of the maintenance personnel cannot be completely guaranteed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fan supply circuit, when overhauing the fan, through the control of realizing the fan power supply with regard to the ground control box, prevented block terminal strange land control effectively, guarantee maintainer's safety.
In order to achieve the above object, the utility model provides a fan supply circuit, include:
the three-phase alternating current power supply is positioned in a distribution box and is connected with the fan through three phase lines and a zero line;
the execution element is arranged between the three-phase alternating-current power supply and the fan and controls the on-off of the three-phase alternating-current power supply and the fan through switching states;
the control circuit comprises a first circuit, a second circuit and a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit or the input end of the second circuit in a switching mode, and the output ends of the first circuit and the second circuit are connected with a neutral line after being connected;
the first circuit and the second circuit can control the switching state of the actuating element, the first circuit is positioned in the distribution box, and the single-pole double-throw switch and the second circuit are positioned in a local control box.
Optionally, the distribution box is connected with the zero line.
Optionally, the executive component is ac contactor, ac contactor includes main contact and coil, the main contact is established ties three-phase alternating current power supply with between the fan, the input of coil with first circuit reaches the output of second circuit is connected, the output of coil with neutral conductor connects, after the coil got electric, the main contact actuation, three-phase alternating current power supply with circular telegram between the fan, the coil outage back, the main contact disconnection, three-phase alternating current power supply with cut off the power supply between the fan.
Optionally, the ac contactor further comprises an auxiliary contact, a signal lamp is further arranged in the local control box, the signal lamp and the auxiliary contact are connected in parallel at two ends of the coil after being connected in series, when the coil is electrified, the auxiliary contact is electrified, and the signal lamp is turned on.
Optionally, a first start switch and a first stop switch are connected in series between the input end and the output end of the first circuit, the first start switch and the first stop switch are both located in the distribution box, and when the movable end of the single-pole double-throw switch is switched to the first circuit: pressing the first starting switch to electrify the coil; and pressing the first stop switch to cut off the power of the coil.
Optionally, a second start switch and a second stop switch are connected in series between the input end and the output end of the second circuit, the second start switch and the second stop switch are located in the local control box, and when the movable end of the single-pole double-throw switch is switched to the second circuit: pressing the second starting switch to electrify the coil; and pressing the second stop switch to cut off the power of the coil.
Optionally, an isolating switch is further arranged in the local control box, the isolating switch is connected in series between the three-phase alternating-current power supply and the fan, the isolating switch is pressed down, and the three-phase alternating-current power supply and the fan are powered off.
Optionally, the voltage between the input end of the control loop and the output end of the control loop is 220V.
Optionally, an air circuit breaker is further connected in series between the three-phase ac power supply and the fan.
Optionally, a stainless steel waterproof cover is further arranged above the box cover of the in-situ control box.
The utility model provides a pair of among fan supply circuit, include: the three-phase alternating current power supply is positioned in a distribution box and is connected with the fan through three phase lines; the execution element is arranged between the three-phase alternating-current power supply and the fan and controls the on-off of the three-phase alternating-current power supply and the fan through switching states; the control circuit comprises a first circuit, a second circuit and a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit or the input end of the second circuit in a switching mode, and the output ends of the first circuit and the second circuit are connected with a neutral line after being connected; the first circuit and the second circuit can control the switching state of the actuating element, the first circuit is positioned in the distribution box, and the single-pole double-throw switch and the second circuit are positioned in a local control box. When the fan is overhauled, the power supply control of the fan can be switched through the single-pole double-throw switch in the local control box, and the safety of maintainers is guaranteed.
Drawings
Fig. 1 is a circuit diagram of a fan power supply circuit provided in an embodiment of the present invention;
wherein the reference numerals are:
10-a first circuit; 20-a second circuit;
A. b, C-phase line; an N-neutral line; m-a fan; PE-zero line; KM 1-main contacts; KM 2-coil; KM 3-auxiliary contacts; KH 1-thermal element; KH 2-normally closed contact; QF-air circuit breaker; QB-load isolation switch; an FU-fuse; a K-single pole double throw switch; SS-first stop switch; SF-first start switch; GSS-second stop switch; GSF-second start switch; HG. GHG-signal light.
Detailed Description
The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
Fig. 1 is the utility model provides a fan supply circuit's circuit diagram, wherein, A, B, C corresponds the connection respectively three-phase alternating current power supply with three phase lines of fan, the N line be three-phase alternating current power supply with neutral line between the fan, the PE line is the zero line. The KM1, the KM2 and the KM3 all belong to the same AC contactor, wherein the KM1 is a main contact of the AC contactor, the KM2 is a coil of the AC contactor, and the KM3 is an auxiliary contact of the AC contactor. KH1 and KH2 both belong to the same thermal relay, KH1 is the thermal element of the thermal relay, KH2 is the normally closed contact of the thermal relay.
As shown in fig. 1, the present embodiment provides a fan power supply circuit, including:
the three-phase alternating current power supply is positioned in a distribution box and is connected with the fan M through three phase lines;
the execution element is arranged between the three-phase alternating-current power supply and the fan M and controls the on-off of the three-phase alternating-current power supply and the fan M through switching states;
the control circuit comprises a first circuit 10, a second circuit 20 and a single-pole double-throw switch K, wherein the single-pole double-throw switch K comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit 10 or the input end of the second circuit 20 in a switching mode, and the output ends of the first circuit 10 and the second circuit 20 are connected with a neutral line N;
the first circuit 10 and the second circuit 20 are both capable of controlling the switching state of the actuator, and the first circuit 10 is located in the distribution box, and the single-pole double-throw switch K and the second circuit 20 are located in a local control box.
Specifically, the three-phase alternating current power supply is electrically connected with the fan through a three-phase alternating current circuit, the neutral line N and the phase line jointly form a control loop, and the zero line PE can be connected to an equipment shell and the like, so that the electricity safety is ensured. The three-phase alternating current power supply is, for example, a three-phase alternating current generator. The distribution box and the fan M are connected with a zero line PE.
In this embodiment, the actuator is an ac contactor, and the circuit is turned on and off by switching the state of the ac contactor. The alternating current contactor has a low-voltage release protection effect and can better control the power supply of the fan M. And the AC contactor has large control capacity and is suitable for frequent operation and remote control. Of course, other actuators, such as a relay, are also possible, and the present application is not limited thereto. In this embodiment, referring to fig. 1, the ac contactor includes a main contact KM1 and a coil KM2, and the KM1 is connected in series between the three-phase ac power supply and the fan M, and is configured to control on/off between the three-phase ac power supply and the fan M. When the main contact KM1 is attracted, the three-phase alternating-current power supply is electrified with the fan M to supply power to the fan M, and otherwise, when the main contact KM1 is disconnected, the three-phase alternating-current power supply is disconnected with the fan M. An input terminal of the coil KM2 is connected to output terminals of the first circuit 10 and the second circuit 20, and an output terminal of the coil KM2 is connected to the neutral line N. When the first circuit 10 or the second circuit 20 is turned on, the coil KM2 is powered on, the main contact KM1 is attracted, and after the coil KM2 is powered off, the main contact KM1 is turned off. It can be simply understood that the first circuit 10 and the second circuit 20 are used for controlling whether the coil KM2 is powered or not, so as to control the opening and closing of the main contact KM1 of the ac contactor.
With reference to fig. 1, the ac contactor further includes an auxiliary contact KM3, a signal lamp GHG is further disposed in the local control box, the signal lamp GHG and the auxiliary contact KM3 are connected in series and then connected in parallel to two ends of the coil KM2, the coil KM2 is powered on, the auxiliary contact KM3 is powered on, and the signal lamp GHG is turned on. The auxiliary contact KM3 is a normally open contact. It can be understood that if the signal lamp GHG is turned on, it indicates that the coil KM2 is powered on, that is, the main contact KM1 is definitely attracted, at this time, the fan M normally operates, and the operating state of the fan M can be truly reflected by the signal lamp GHG. If the signal lamp GHG is not provided, once the executive component fails, whether the fan M operates normally or not cannot be intuitively known. In this embodiment, the first circuit 10 is also provided with a signal lamp HG, the signal lamp HG is located in the distribution box, and the signal lamp HG on the first circuit 10 is connected in parallel with the signal lamp GHG of the second circuit 20 and then connected in series with the auxiliary contact KM3, so as to reflect the operating state of the fan M in the distribution box.
With continued reference to fig. 1, the control loop is used to control the switching state of the actuator, and its input end may be connected to any one of A, B, C phase lines, and its output end is connected to the neutral line N. In this embodiment, the input end of the control loop is connected to the phase line a, and the output end is connected to the neutral line N. The voltage between the input end of the control loop and the output end of the control loop is 220V, and a fuse FU is further connected to the control loop in series.
With continued reference to fig. 1, the single-pole double-throw switch K may be a combination switch capable of selecting and switching between the first circuit 10 and the second circuit 20. In this embodiment, when the fan M normally works, the movable end of the single-pole double-throw switch K is connected to the first circuit 10, and since the first circuit 10 is located in the distribution box, the on-off state between the three-phase ac power supply and the fan M can be controlled by performing corresponding operations in the distribution box, so as to control the power supply to the fan M. When the fan M breaks down and needs to be overhauled, the movable end of the single-pole double-throw switch K is connected with the second circuit 20, the second circuit 20 is located in the local control box, the local control box is close to the fan M, and the on-off between the three-phase alternating-current power supply and the fan can be controlled by performing corresponding operation in the local control box. And, because the first circuit 10 is not switched on at this moment, even if misoperation occurs in the distribution box, as long as the second circuit 20 cannot be switched on, the coil KM2 of the ac contactor cannot be powered on, and then the main contact KM1 of the ac contactor is in a switched-off state, so that the three-phase ac power supply and the fan M are powered off, thereby avoiding the risk of remote control of the distribution box and ensuring the safety of maintenance personnel.
Referring to fig. 1, a first start switch SF and a first stop switch SS are connected in series to the first circuit 10, and both the first start switch SF and the first stop switch SS are located in the distribution box, when the movable end of the single-pole double-throw switch K is switched to the first circuit 10: when the first starting switch SF is pressed, the coil KM2 is electrified, the main contact KM1 is attracted, and the three-phase alternating-current power supply is electrified with the fan M; when the first stop switch SS is pressed, the coil KM2 is powered off, the main contact KM1 is disconnected, and the three-phase alternating current power supply is powered off from the fan M. In this embodiment, the first start switch SF is a normally open switch, and the first stop switch SS is a normally closed switch. When the fan M normally operates, the first starting switch SF is pressed, the first circuit 10 is switched on, the coil KM2 is powered on, the main contact KM1 is attracted, and the three-phase alternating-current power supply is electrified with the fan M and supplies power to the fan M. When the fan M needs to be turned off, the first stop switch SS is pressed, and the first circuit 10 is powered off. The first start switch SF and the first stop switch SS are convenient for the daily operation of the equipment management personnel.
Referring to fig. 1, a second start switch GSF and a second stop switch GSS are connected in series to the second circuit 20, the second start switch GSF and the second stop switch GSS are located in the local control box, and when the movable terminal of the single-pole double-throw switch K is switched to the second circuit 20: when the second starting switch GSF is pressed, the coil KM2 is electrified, the main contact KM1 is attracted, and the three-phase alternating-current power supply is electrified with the fan M; when the second stop switch GSS is pressed, the coil KM2 is deenergized, the main contact KM1 is disconnected, and the three-phase ac power supply is deenergized with the fan M. In this embodiment, the second start switch GSF is a normally open switch, and the second stop switch GSS is a normally closed switch. When the fan M breaks down and needs to be overhauled, the movable end of the single-pole double-throw switch K is firstly switched to the second circuit 20, so that the local control box masters the 'control right' of on-off between a three-phase alternating-current power supply and the fan M, the second stop switch GSS is pressed down, the second circuit 20 is powered off, the coil KM2 is powered off, the main contact KM1 is powered off, and the three-phase alternating-current power supply and the fan M are powered off so as to be convenient for safe overhauling. After the fault is repaired, the second start switch GSF is pressed to test the fan M, if it is determined that the fault of the fan M is repaired, the movable end of the single-pole double-throw switch K may be switched to the first circuit 10, and then the first start switch SF is pressed, so that the normal power supply of the fan M may be recovered.
Referring to fig. 1, an isolating switch QB is further disposed in the local control box, the isolating switch QB is connected in series between the three-phase ac power supply and the fan M, and when the isolating switch QB is pressed, the three-phase ac power supply and the fan M are powered off. The isolating switch QB is mainly used for reliably isolating the part needing power failure in the distribution box from the electrified part so as to ensure the safety of maintenance work. The contacts of the isolating switch QB are all exposed in the air, and visible disconnection points are guaranteed during maintenance. In this embodiment, the isolation switch QB is located in the box body of the local control box, and the second start switch GSF, the second stop switch GSS and the signal lamp GHG are located on the box surface of the local control box. In this embodiment, a stainless steel waterproof cover is further disposed on the top of the local control box to prevent rainwater from entering the local control box and damaging elements such as the isolating switch QB.
And an air breaker QF is also connected in series between the three-phase alternating current power supply and the fan. The air circuit breaker QF is mainly used for protecting when a circuit or electrical equipment is short-circuited, seriously overloaded and undervoltage.
With reference to fig. 1, the fan power supply circuit further includes a thermal relay, the thermal relay includes a thermal element KH1 and a normally closed contact KH2, the thermal element KH1 is connected in series between the three-phase ac power supply and the fan M, and the normally closed contact KH2 is connected in series between the output end of the coil KM2 and the neutral line N. When the motor is overloaded, the current flowing through the thermal element KH1 exceeds the setting current of the thermal relay, the resistance wire heats, the temperature rises, the main bimetallic strip bends rightwards due to different thermal expansion degrees of the two metal strips, the normally closed contact KH2 is pushed to be disconnected through the action mechanism, the control loop is disconnected, the coil KM2 is powered off, and the main contact KM1 is disconnected, so that the power supply between the three-phase alternating-current power supply and the fan M is cut off, and the overload protection of the three-phase alternating-current power supply is realized.
To sum up, the embodiment of the utility model provides a fan supply circuit, include: the three-phase alternating current power supply is positioned in a distribution box and is connected with the fan through three phase lines; the execution element is arranged between the three-phase alternating-current power supply and the fan and controls the on-off of the three-phase alternating-current power supply and the fan through switching states; the control circuit comprises a first circuit, a second circuit and a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit or the input end of the second circuit in a switching mode, and the output ends of the first circuit and the second circuit are connected with a neutral line after being connected; the first circuit and the second circuit can control the switching state of the actuating element, the first circuit is positioned in the distribution box, and the single-pole double-throw switch and the second circuit are positioned in a local control box. When the fan is overhauled, the power supply control of the fan can be switched through the single-pole double-throw switch in the local control box, and the safety of maintainers is guaranteed.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (10)
1. A fan power supply circuit, comprising:
the three-phase alternating current power supply is positioned in a distribution box and is connected with the fan through three phase lines and a zero line;
the execution element is arranged between the three-phase alternating-current power supply and the fan and controls the on-off of the three-phase alternating-current power supply and the fan through switching states;
the control circuit comprises a first circuit, a second circuit and a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and a fixed end, the fixed end is connected with any one of the three phase lines, the movable end is connected with the input end of the first circuit or the input end of the second circuit in a switching mode, and the output ends of the first circuit and the second circuit are connected with a neutral line after being connected;
the first circuit and the second circuit can control the switching state of the actuating element, the first circuit is positioned in the distribution box, and the single-pole double-throw switch and the second circuit are positioned in a local control box.
2. The fan power supply circuit of claim 1 wherein the electrical box is connected to the neutral wire.
3. The fan power supply circuit according to claim 1, wherein the actuator is an ac contactor, the ac contactor includes a main contact and a coil, the main contact is connected in series between the three-phase ac power supply and the fan, an input end of the coil is connected to output ends of the first circuit and the second circuit, an output end of the coil is connected to the neutral line, when the coil is powered on, the main contact is closed, the three-phase ac power supply and the fan are powered on, when the coil is powered off, the main contact is opened, and when the three-phase ac power supply and the fan are powered off.
4. The fan power supply circuit according to claim 3, wherein the ac contactor further comprises an auxiliary contact, a signal lamp is further disposed in the local control box, the signal lamp and the auxiliary contact are connected in series and then connected in parallel to two ends of the coil, when the coil is powered, the auxiliary contact is powered, and the signal lamp is turned on.
5. The fan power supply circuit according to claim 3, wherein a first start switch and a first stop switch are connected in series between the input end and the output end of the first circuit, the first start switch and the first stop switch are both located in the distribution box, and when the movable end of the single-pole double-throw switch is switched to the first circuit: pressing the first starting switch to electrify the coil; and pressing the first stop switch to cut off the power of the coil.
6. The fan power supply circuit according to claim 3 or 5, wherein a second start switch and a second stop switch are connected in series between the input end and the output end of the second circuit, the second start switch and the second stop switch are located in the local control box, and when the movable end of the single-pole double-throw switch is switched to the second circuit: pressing the second starting switch to electrify the coil; and pressing the second stop switch to cut off the power of the coil.
7. The fan power supply circuit according to claim 1, wherein an isolating switch is further arranged in the local control box, the isolating switch is connected in series between the three-phase alternating-current power supply and the fan, the isolating switch is pressed, and the three-phase alternating-current power supply and the fan are powered off.
8. The fan supply circuit of claim 1 wherein the voltage between the input of the control loop and the output thereof is 220V.
9. The fan power supply circuit of claim 1 wherein an air circuit breaker is further connected in series between the three-phase ac power supply and the fan.
10. The fan power supply circuit of claim 1 wherein a stainless steel waterproof cover is further disposed over the box cover of the local control box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020502077.XU CN211701092U (en) | 2020-04-08 | 2020-04-08 | Fan power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020502077.XU CN211701092U (en) | 2020-04-08 | 2020-04-08 | Fan power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211701092U true CN211701092U (en) | 2020-10-16 |
Family
ID=72782418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020502077.XU Expired - Fee Related CN211701092U (en) | 2020-04-08 | 2020-04-08 | Fan power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211701092U (en) |
-
2020
- 2020-04-08 CN CN202020502077.XU patent/CN211701092U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20201016 |