CN213402875U - Power supply switching device - Google Patents
Power supply switching device Download PDFInfo
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- CN213402875U CN213402875U CN202022694188.8U CN202022694188U CN213402875U CN 213402875 U CN213402875 U CN 213402875U CN 202022694188 U CN202022694188 U CN 202022694188U CN 213402875 U CN213402875 U CN 213402875U
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003111 delayed effect Effects 0.000 claims abstract description 4
- 239000012212 insulator Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009131 signaling function Effects 0.000 description 1
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Abstract
The application relates to a power supply switching device, which comprises a shell, wherein a circuit is arranged in the shell, and the circuit comprises a detection unit, a fault output terminal and a switching unit, wherein the detection unit is used for connecting a fault output terminal of a frequency converter and outputting a switching signal after receiving a fault signal of the frequency converter; and the switching unit is connected to the detection unit and used for controlling the output of the power frequency signal after receiving the switching signal output by the detection unit. The switching unit further comprises a delay unit, wherein the delay unit is connected to the detection unit and is used for switching to a power frequency state in a delayed mode after receiving the switching signal. The method and the device have the effect of reducing the phenomenon that the motor set stops due to the fact that the engine stops after the frequency conversion fault.
Description
Technical Field
The application relates to the field of electrical equipment, in particular to a power supply switching device.
Background
At present, motors are applied to various industries, and a plurality of high-power motors need to change the working frequency thereof through a frequency converter, so that the effects of reducing equipment power consumption, improving operation efficiency, reducing plant power consumption and saving energy are achieved.
Because the frequency converter has complex equipment structure, more parts and large heat productivity, the probability of failure in operation still exists, particularly, at the initial stage of production, the failure is relatively more, and after the frequency converter fails, the frequency converter must trip to protect the motor and the frequency converter. However, the tripping of the frequency converter means that the whole dragging system stops working, so that the machine set is stopped, and great safety threat and serious economic loss are caused.
SUMMERY OF THE UTILITY MODEL
In order to reduce the phenomenon that the motor set stops due to the fact that the engine stops after the frequency conversion fault, the power supply switching device is provided.
The application provides a power switching device adopts following technical scheme:
a power switching apparatus comprising a housing, a circuit disposed within the housing, the circuit comprising:
the detection unit is used for connecting a fault output terminal of the frequency converter and outputting a switching signal after receiving a fault signal of the frequency converter;
and the switching unit is connected to the detection unit and used for controlling the output of the power frequency signal after receiving the switching signal output by the detection unit.
Through adopting above-mentioned technical scheme, after the converter broke down in driving the motor and having moved and be, trouble output terminal on the converter can move, is connected to the detection unit on the converter trouble output terminal and detects the motor trouble after, outputs switching signal to through switching unit output power frequency signal, thereby realize switching over to power frequency signal's function after the converter broke down.
Optionally, the circuit further includes a signal indication unit, where the indication unit is connected to the detection unit and the switching unit, and is configured to send an optical signal to indicate a working state of power frequency or frequency conversion.
By adopting the technical scheme, the indicating unit can emit corresponding light to indicate the working state of the equipment.
Optionally, the circuit further comprises a control unit, and the control unit is connected with the detection unit and the switching unit and used for manually switching the power frequency or frequency conversion working state.
By adopting the technical scheme, the control unit is arranged, so that a worker can conveniently adjust the equipment to a power frequency state or a frequency conversion state, and when a detection unit or a switching unit in the circuit breaks down, the working state of the equipment can be switched by the control unit, so that the equipment can be conveniently overhauled; or the equipment can be suitable for various working occasions and has higher practicability.
Optionally, the switching unit further includes a delay unit, where the delay unit is connected to the detection unit, and is configured to delay switching to the power frequency state after receiving the switching signal.
By adopting the technical scheme, after the motor is suddenly disconnected in the running process of the frequency conversion state, the motor is switched to the power frequency state after being delayed for a certain time under the action of the delay unit, so that the phenomenon that the service life of load equipment is influenced by overlarge current impact caused by suddenly switching to the power frequency state is prevented.
Optionally, the housing is provided with at least three fixing holes.
By adopting the technical scheme, the fixing holes arranged on the shell can be fixed by bolts or screws, so that the circuit device is prevented from being damaged or misoperated by overlarge vibration in the operation process,
optionally, the housing is an insulator.
Through adopting above-mentioned technical scheme, the casing is the setting of insulator, can effectively protect staff's personal safety, prevents to touch to the casing and take place the electric shock accident in operation process.
Optionally, a fuse FU is connected in series in the circuit, one end of the fuse FU is connected to a power supply terminal, and the other end of the fuse FU is connected to the detection unit, the switching unit and the signal indication unit.
Through adopting above-mentioned technical scheme, the fuse FU that sets up in the circuit can effectively protect the components and parts in the circuit, prevents that the short circuit from appearing and causing the phenomenon that damages or the arcing causes the conflagration to take place to components and parts.
Optionally, a contactor is arranged in the housing, and a main contact of the contactor is exposed out of the housing.
By adopting the technical scheme, the contactor is used for switching on and switching off the power frequency main circuit, the contactor is arranged in the shell, wiring outside the shell can be reduced, the installation and operation environment is better, and convenience in installation and maintenance is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the frequency converter has a fault during the driving of the motor, a fault output terminal on the frequency converter can act, a detection unit connected to the fault output terminal of the frequency converter outputs a switching signal after detecting the fault of the motor, and outputs a power frequency signal through a switching unit, so that the function of switching to the power frequency signal after the frequency converter has the fault is realized;
2. fuse FU that sets up in the way can effectively protect the components and parts in the circuit, prevents to appear the short circuit and causes damage or the phenomenon that the arcing caused the conflagration to appear to components and parts, and the casing is insulating material simultaneously, can effectively protect staff's personal safety, prevents to touch to the casing and takes place the electric shock accident in operation process, improve equipment operation's security.
Drawings
Fig. 1 is a structural view of a housing provided in an embodiment of the present application.
Fig. 2 is an electrical schematic provided in an embodiment of the present application.
Description of reference numerals: 1. a housing; 2. a detection unit; 3. a switching unit; 4. an indicating unit; 5. a control unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a power supply switching device. Referring to fig. 1 and 2, the device comprises a shell 1, wherein the shell 1 is made of an insulating material and is used for reducing electric shock accidents during maintenance or manual operation; the shell 1 is provided with at least three fixing holes, and the fixing holes are used for fixing on a wall surface or a switchboard through bolts or screws; in which a circuit is arranged, which circuit comprises a detection unit 2 and a switching unit 3. The detection unit 2 is used for connecting a fault output terminal of the frequency converter and outputting a switching signal after receiving a fault signal of the frequency converter; the switching circuit is connected to the detection unit 2 and is used for outputting a power frequency driving signal after receiving the switching signal output by the detection unit 2.
In one embodiment, the detection unit 2 specifically includes an intermediate relay KA and a contactor KM1, one end of a coil of the intermediate relay KA is connected to a zero line, and the other end and one terminal connected with a phase line are exposed to the outside of the casing 1 and are used for connecting a fault output terminal of the frequency converter; one end of a coil of the contactor KM1 is connected to a zero line, the other end of the coil is connected to a phase line through a normally open contact of an intermediate relay KA connected in series, and a main contact of the contactor is exposed out of the shell 1 and used for connecting a main line and a load at the output end of the frequency converter. The switching unit 3 specifically comprises a contactor KM2 and a normally closed auxiliary contact of a contactor KM1 connected in series with the contactor KM2, one end of the switching unit 3 is connected to a zero line, the other end of the switching unit is connected to one end, deviating from the zero line, of an intermediate relay KA coil, and a main contact of the contactor KM2 is exposed out of the shell 1 and used for being connected with a mains supply and a load.
Further, the switching unit 3 further comprises a delay unit, wherein the delay unit is connected to the detection unit 2 and is used for switching to a power frequency output state in a delayed manner after receiving the switching signal. In one embodiment, the delay unit specifically comprises a delay relay KT, coils of the delay relay KT are connected to two ends of a coil of an intermediate relay KA in parallel, and an auxiliary contact of the delay relay KT is connected to a branch where a coil of a contactor KM2 is located in series.
When the wiring is installed, the output ends of the main wiring terminals of the contactors KM1 and KM2 can be connected to a load, the input end of the main terminal of the contactor KM1 can be connected to the output end of a frequency converter, and the input end of the Zhu terminal of the contactor KM2 is connected to three power supplies of commercial power. After the frequency converter breaks down and outputs a fault signal, a coil of the intermediate relay KA is connected with a phase line and is attracted, a normally closed auxiliary contact acts and is disconnected, the coil of the contactor KM1 is powered off, a main contact of the contactor KM1 is disconnected, and therefore a driving electric signal connected with the output end of the frequency converter is cut off; meanwhile, a KT coil of the time delay relay is electrified and starts timing, when the setting time is up, the auxiliary contact acts to be closed, and the coil of the contactor KM2 is connected with a power supply, so that a power frequency driving point signal can be output from the main contact of the contactor KM 2.
Furthermore, the circuit also comprises an indicating unit 4 for sending out optical signals to indicate the working state of power frequency or frequency conversion. Specifically, the indicating unit 4 comprises two indicating lamps H1-H2, wherein the indicating lamp H1 is connected to a mains supply through a normally open contact of a contactor KM1 connected in series, and when the indicating lamp H1 is on, the load is in a variable-frequency working state; the indicator lamp H2 is connected to a mains supply through a normally open contact of the contactor KM2 which is connected in series, and when the indicator lamp H2 is on, the load is in a power frequency working state.
In one embodiment, the circuit further comprises a control unit 5, and the control unit 5 is connected to the detection unit 2 and the switching unit 3 and is used for manually switching the power frequency or variable frequency working state. Specifically, the control unit 5 comprises a change-over switch, a start button SB1 and a stop button SB2, one set of nodes of the change-over switch being connected to the phase line and being connected in series with the start button SB1 and the stop button SB 2; the other end is connected to the connection point between the auxiliary contact of the time relay KT and the normally closed contact of the contactor KM1, and the other group of nodes of the change-over switch are connected to the phase line and the detection unit 2. And the two ends of the starting button SB1 are connected in parallel with a normally open contact of the contactor KM2, and the normally open contact is used for playing a self-locking role when the power frequency operation is manually adjusted.
Fuse FU has concatenated in the circuit, and fuse FU's one end is connected to the power supply terminal, and the other end is connected to detecting element 2, indicating unit 4 and change over switch. Like this, at the circuit operation in-process, all electric currents all can pass through fuse FU, can effectively protect the components and parts among the circuit, prevent the short circuit and cause the phenomenon that damages or the arcing causes the conflagration to take place to components and parts.
The implementation principle of the power switching device in the embodiment of the application is as follows: when the frequency converter drives the motor to run and is broken down in the process, the fault output terminal on the frequency converter can act, the detection unit 2 connected to the fault output terminal of the frequency converter outputs a switching signal after detecting the motor fault, and the switching unit 3 outputs a power frequency signal, so that the function of switching to the power frequency signal after the frequency converter breaks down is realized.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A power switching apparatus, characterized in that: including casing (1), be equipped with the circuit in casing (1), the circuit includes:
the detection unit (2) is used for connecting a fault output terminal of the frequency converter and outputting a switching signal after receiving a fault signal of the frequency converter;
and the switching unit (3) is connected to the detection unit (2) and is used for controlling the output of the power frequency signal after receiving the switching signal output by the detection unit (2).
2. A power switching apparatus according to claim 1, wherein: the circuit further comprises a signal indicating unit (4), wherein the indicating unit (4) is connected to the detecting unit (2) and the switching unit (3) and used for sending an optical signal to indicate the working state of power frequency or frequency conversion.
3. A power switching apparatus according to claim 1, wherein: the circuit further comprises a control unit (5), wherein the control unit (5) is connected with the detection unit (2) and the switching unit (3) and used for manually switching the power frequency or frequency conversion working state.
4. A power switching apparatus according to claim 1, wherein: the switching unit (3) further comprises a delay unit, wherein the delay unit is connected to the detection unit (2) and is used for switching to a power frequency state in a delayed mode after receiving the switching signal.
5. A power switching apparatus according to claim 1, wherein: at least three fixing holes are formed in the shell (1).
6. A power switching apparatus according to claim 1, wherein: the shell (1) is an insulator.
7. A power switching apparatus according to claim 1, wherein: fuse FU has concatenated in the circuit, fuse FU's one end is connected to the power supply terminal, and the other end is connected to detecting element (2), switch unit (3) and signal indication unit (4).
8. A power switching apparatus according to claim 1, wherein: the contactor is arranged in the shell (1), and a main contact of the contactor is exposed out of the shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694188.8U CN213402875U (en) | 2020-11-19 | 2020-11-19 | Power supply switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694188.8U CN213402875U (en) | 2020-11-19 | 2020-11-19 | Power supply switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402875U true CN213402875U (en) | 2021-06-08 |
Family
ID=76194620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022694188.8U Expired - Fee Related CN213402875U (en) | 2020-11-19 | 2020-11-19 | Power supply switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213402875U (en) |
-
2020
- 2020-11-19 CN CN202022694188.8U patent/CN213402875U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210608 Termination date: 20211119 |