CN202678938U - Motor overload protection circuit for motor-driven oil well pump - Google Patents
Motor overload protection circuit for motor-driven oil well pump Download PDFInfo
- Publication number
- CN202678938U CN202678938U CN 201220374095 CN201220374095U CN202678938U CN 202678938 U CN202678938 U CN 202678938U CN 201220374095 CN201220374095 CN 201220374095 CN 201220374095 U CN201220374095 U CN 201220374095U CN 202678938 U CN202678938 U CN 202678938U
- Authority
- CN
- China
- Prior art keywords
- motor
- contactor
- button
- phase circuit
- oil well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a motor overload protection circuit for a motor-driven oil well pump. The motor overload protection circuit comprises a three-phase circuit, wherein a motor, a fuse and a switch QS are in tandem connection in the three-phase circuit. A coil of a thermorelay FR and a normally open contact of a contactor KM are in series connection in a major loop of the three-phase circuit. A control switch subcircuit is connected between two phases of the three-phase circuit and comprises a normally closed contact of the thermorelay FR, a normally closed button SB1, a normally open button SB2, an indicator light L and a coil of the contactor KM which are connected in series. The normally open button SB2 is in parallel connection with the normally open contact of the contactor KM. The motor overload protection circuit for the motor-driven oil well pump has the advantages that due to the fact that an overload relay is installed, automatic power-off can be achieved when the three-phase circuit is overloaded so that the motor can be protected and service life is prolonged; aging of lines can be prevented effectively, and service life of the lines can be prolonged; and operation is simple and the safety factor is large due to the fact that a knife switch does not need to be operated frequently, and a press-button switch is adopted.
Description
Technical field
The utility model relates to a kind of motor overload protective circuit of Dynamoelectric oil well pump.
Background technology
In the process of producing lubricating oil, use Dynamoelectric oil well pump and extract lubricating oil out can, in general the motor switch of Dynamoelectric oil well pump adopts knife switch, is serially connected in the three-phase circuit, but because the motor switch of Dynamoelectric oil well pump is more frequent, it is excessive to add the motor power consumption, is easy to cause the plug-in strip contact slap, and the heat of generation can burn out the screw contact point, fault appears, cause the Damage by Short Circuit motor when serious, and coefficient of safety is low, and the operator is got an electric shock.
Summary of the invention
For solving above technical deficiency, the utility model provides a kind of can prolong electrical machinery life, simple to operate, the motor overload protective circuit of the Dynamoelectric oil well pump that coefficient of safety is large.
The utility model is realized by following measures:
The motor overload protective circuit of a kind of Dynamoelectric oil well pump of the present utility model; comprise three-phase circuit; be serially connected with motor in the described three-phase circuit; fuse and switch QS; also be in series with the coil of thermal relay FR and the normally opened contact of contactor KM in the described three-phase electricity major loop; wherein be connected to the control switch branch road between the two-phase on the described three-phase circuit; described control switch branch road comprises the normally-closed contact of the thermal relay FR of series connection; normally closed button SB1; often open button SB2; the coil of indicator light L and contactor KM is describedly often opened the normally opened contact that button SB2 is parallel with contactor KM.
The beneficial effects of the utility model are:
1. overload relay has been installed, can auto-breaking when the three-phase circuit excess load, the protection motor increases the service life.2. can effectively prevent aging circuit, extension wire useful life.3. without the frequent operation knife switch, adopt push-button switch, simple to operate, coefficient of safety is large.
Description of drawings
Fig. 1 is circuit catenation principle figure of the present utility model.
Embodiment
As shown in Figure 1; the motor overload protective circuit of a kind of Dynamoelectric oil well pump of the present utility model; comprise three-phase circuit; be serially connected with motor, fuse and switch QS in the three-phase circuit; also be in series with the coil of thermal relay FR and the normally opened contact of contactor KM in the three-phase electricity major loop; wherein be connected to the control switch branch road between the two-phase on the three-phase circuit; the control switch branch road comprises the normally-closed contact of the thermal relay FR of series connection, normally closed button SB1, often opens the coil of button SB2, indicator light L and contactor KM, often opens the normally opened contact that button SB2 is parallel with contactor KM.
Its operation principle is: during normal operation, the switch QS in the three-phase circuit is closed, and normally closed button SB1 is in closure state as shutdown switch, often opens button SB2 and is in off-state as starting switch, often opens the normally opened contact interlocking of button SB2 and contactor KM.When starting, press and often open button SB2, this moment indicator light L and contactor KM coil get electric, thereby indicator light L is bright, the normally opened contact of contactor KM is closed, so three-phase circuit is connected electric motor starting.When pressing normally closed button SB1, the outage of control switch branch road, the coil losing electricity of contactor KM, the normally opened contact of contactor KM disconnects, thus three-phase circuit disconnects, and motor stops.
Above-described embodiment is described to be to specify this patent; though describe by specific term in the literary composition; but can not limit with this protection range of this patent; being familiar with the personage of this technical field can be after the spirit of understanding this patent and principle change or revises it and reach equivalent purpose; and this equivalence change and modification all should be covered by the claim scope and define in the category.
Claims (1)
1. the motor overload protective circuit of a Dynamoelectric oil well pump; comprise three-phase circuit; be serially connected with motor in the described three-phase circuit; fuse and switch QS; it is characterized in that: also be in series with the coil of thermal relay FR and the normally opened contact of contactor KM in the described three-phase electricity major loop; wherein be connected to the control switch branch road between the two-phase on the described three-phase circuit; described control switch branch road comprises the normally-closed contact of the thermal relay FR of series connection; normally closed button SB1; often open button SB2; the coil of indicator light L and contactor KM is describedly often opened the normally opened contact that button SB2 is parallel with contactor KM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374095 CN202678938U (en) | 2012-07-31 | 2012-07-31 | Motor overload protection circuit for motor-driven oil well pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374095 CN202678938U (en) | 2012-07-31 | 2012-07-31 | Motor overload protection circuit for motor-driven oil well pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202678938U true CN202678938U (en) | 2013-01-16 |
Family
ID=47499813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220374095 Expired - Fee Related CN202678938U (en) | 2012-07-31 | 2012-07-31 | Motor overload protection circuit for motor-driven oil well pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202678938U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927528A (en) * | 2016-05-26 | 2016-09-07 | 淮南市宜留机械科技有限公司 | Overload and idling prevention assembly for electric oil well pump |
| CN108480409A (en) * | 2018-03-21 | 2018-09-04 | 中山中舟海洋科技有限公司 | Anti-overload cold drawing machine |
-
2012
- 2012-07-31 CN CN 201220374095 patent/CN202678938U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927528A (en) * | 2016-05-26 | 2016-09-07 | 淮南市宜留机械科技有限公司 | Overload and idling prevention assembly for electric oil well pump |
| CN108480409A (en) * | 2018-03-21 | 2018-09-04 | 中山中舟海洋科技有限公司 | Anti-overload cold drawing machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204464961U (en) | Motor overcurrent protection warning device | |
| CN201733267U (en) | Power reset self-starting device for asynchronous motor | |
| CN203617686U (en) | Simple control circuit for open-phase protection | |
| CN202678938U (en) | Motor overload protection circuit for motor-driven oil well pump | |
| CN204497717U (en) | A kind of telegram in reply auto recloser | |
| CN201937539U (en) | Star-delta automatic switching device for motor | |
| CN203645309U (en) | Three-phase motor overcurrent protection device | |
| CN102684158A (en) | Overheat delay protection device for motor | |
| CN204578070U (en) | Open-phase protection circuit of motor | |
| CN101908852A (en) | Power-saving Y-delta starter of motor | |
| CN204794028U (en) | Intellectuality ac motor protector that is just reversing | |
| CN202260395U (en) | Full-stop tripping protection circuit of transformer cooler | |
| CN204103785U (en) | Silicon rectifier draw-gear | |
| CN201478800U (en) | Interlock protection device used for high-voltage system of high-voltage motor and low pressure system of thin oil station | |
| CN204633646U (en) | A kind of disintegrating machine threephase asynchronous machine soft starting device | |
| CN202268633U (en) | Low-voltage power distribution cabinet with protection | |
| CN202474823U (en) | Integrated protection device for electromotor | |
| CN102394488A (en) | Open-phase protection circuit of motor | |
| CN202384744U (en) | Full-stop protection device for cooler of forced oil-air cooling power transformer | |
| CN200941548Y (en) | Low voltage power capacitor combined appliance having internal temp protection of capacitor | |
| CN202651758U (en) | Three-phase asynchronous alternating current motor protection circuit | |
| CN205050692U (en) | Distribution transformer on post with built -in protect function | |
| CN2826787Y (en) | Ultra under-voltage lack phase protector for three-phase electrical appliance | |
| CN203166476U (en) | Low-voltage power distribution equipment protection device | |
| CN202455043U (en) | Three-phase motor tail-end phase failure protective device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20160731 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |