CN204696662U - A kind of phase-lacking protective device of suction pump three phase electric machine - Google Patents
A kind of phase-lacking protective device of suction pump three phase electric machine Download PDFInfo
- Publication number
- CN204696662U CN204696662U CN201520439283.XU CN201520439283U CN204696662U CN 204696662 U CN204696662 U CN 204696662U CN 201520439283 U CN201520439283 U CN 201520439283U CN 204696662 U CN204696662 U CN 204696662U
- Authority
- CN
- China
- Prior art keywords
- phase
- electric machine
- suction pump
- protective device
- protective
- 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
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a kind of phase-lacking protective device of suction pump three phase electric machine, belongs to suction pump technical field.To it solve in prior art circuit in suction pump phase-defect complicated, the problem that cost is high.This suction pump phase-lacking protective device of three phase electric machine comprises protector; protector has three terminals, three protective resistances and an elastic conduction contact; the equal correspondence of each terminals is connected to one end of a protective resistance; the other end of three protective resistances is connected by Y type; the common port of three described protective resistances is connected to an elastic conduction contact; three binding posts connect three leading-out terminals of three phase electric machine respectively, and three ends of incoming cables of three phase electric machine connect three phase mains respectively.This phase-lacking protective device protected effect is good, and electric current is simple, and cost is low, and be easy to realize, practicality is high.
Description
Technical field
The utility model belongs to suction pump technical field, relates to a kind of suction pump three phase electric machine, particularly a kind of phase-lacking protective device of suction pump three phase electric machine.
Background technology
If three-phase alternating-current motor lacks to fall a phase or multi-phase operation because of various reasons, current of electric will be made sharply to increase, thus cause motor temperature to raise, finally make burn-down of electric motor.In electric-automation control system, motor phase failure runs and often depends on the overload protection be made up of thermal relay.The utility model patent that such as China national Department of Intellectual Property is authorized: a kind of motor phase failure fast tripping protection device (application number 201320291594.7).Which disclose following scheme: comprise three auxiliary relays, its three coil one end are connected respectively the three-phase electricity source accessing three phase electric machine with these three binding posts of three binding posts, and three coil other ends are connected to neutral line link altogether; Three normally opened contact series connection formation, two links of three auxiliary relays, and series connection access starting of three phases motor control circuit; Three light-emitting diodes and three current-limiting resistances, a light-emitting diode and current-limiting resistance series connection, which binding post circuit is connected to three auxiliary relay coils from parallel connection of coils is respectively.Such scheme can solve the problem that phase shortage causes electric current to increase in time, but its circuit is complicated, and electric elements are various, and cost is higher.
Summary of the invention
There are the problems referred to above for existing technology in the utility model, proposes the phase-lacking protective device of the suction pump three phase electric machine that a kind of circuit is simple, cost is low, and the phase-lacking protective device of this suction pump three phase electric machine can be cut off the electricity supply when motor phase failure runs.
The utility model is realized by following technical proposal: a kind of phase-lacking protective device of suction pump three phase electric machine, it is characterized in that, comprise protector, described protector has three terminals, three protective resistances and an elastic conduction contact, the equal correspondence of each described terminals is connected to one end of a protective resistance, the other end of three protective resistances is connected by Y type, the common port of three described protective resistances is connected to an elastic conduction contact, described three binding posts connect three leading-out terminals of three phase electric machine respectively, three ends of incoming cables of described three phase electric machine connect three phase mains respectively.
The utility model is connected with three protective resistances by elastic conduction contact; if when there is phase shortage; the protective resistance inefficacy that phase shortage is corresponding; the ER effect flowing through protector is large; when electric current exceeds rated current, the heating of elastic conduction contact increases, its generation deformation of being heated; elastic conduction contact is separated with the common port of protective resistance, thus open circuit realize defencive function.
In the phase-lacking protective device of above-mentioned a kind of suction pump three phase electric machine, the ratio range of the deformation threshold value of described elastic conduction contact and the load current value of protector is 1.4-1.6 times.
In the phase-lacking protective device of above-mentioned a kind of suction pump three phase electric machine, the ratio range of the deformation threshold value of described elastic conduction contact and the load current value of protector is 1.5.This parameter of 1.5 times can arrange different value according to the size of the deformation threshold values of flexure strip and rated current.
In the phase-lacking protective device of above-mentioned a kind of suction pump three phase electric machine, described elastic conduction contact is aluminium alloy contact.
Compared with prior art; the utility model has the following advantages: when three-phase has a phase open circuit (phase shortage); just lacked the protective resistance of that phase, the electric current I of overprotection device will become large, when the 1-1.5 times of normal current; this circuit can also normally work; when exceeding 1.5 times of normal current, the heat that electric current produces makes the flexure strip deformation disengaging of common port and the contact of common port, thus the disconnection of whole circuit is played a protective role; circuit is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the phase-lacking protective device of suction pump three phase electric machine in the present embodiment.
Embodiment
Be below specific embodiment of the utility model, and by reference to the accompanying drawings the technical solution of the utility model be further described, but the utility model is not limited to these embodiments.
As shown in Figure 1, this suction pump phase-lacking protective device of three phase electric machine comprises protector, protector has terminals A, terminals B, terminals C, protective resistance R1, protective resistance R2, protective resistance R3 and elastic conduction contact FU, terminals A is connected with one end of protective resistance R1, terminals B is connected with one end of protective resistance R2, terminals C is connected with one end of protective resistance R3, protective resistance R1, protective resistance R2 and the protective resistance R3 other end adopt Y type to be joined together to form a common port, this common port is connected to elastic conduction contact FU one end, the other end earth connection N of elastic conduction contact FU, terminals A, terminals B, terminals C connects the leading-out terminal V2 of three phase electric machine respectively, terminals U2 and terminals W2, the end of incoming cables V1 of three phase electric machine, end of incoming cables U1 is connected three phase mains L respectively with end of incoming cables W1.
It should be noted that, the elastic conduction contact FU in the present embodiment adopts aluminium alloy to make, and the ratio range of the deformation threshold value of this aluminium alloy and the load current value of protector is between 1.4-1.6 times.This parameter of 1.5 times can arrange different value according to the size of the deformation threshold values of flexure strip FU and rated current.
As a kind of preferred version, adopt the ratio range of the load current value of deformation threshold value and protector be 1.5 aluminium alloy make elastic conduction contact FU.
Operation principle of the present utility model is as follows:
When suction pump runs, if there is a phase open circuit (namely phase shortage occurring) in three-phase, that corresponding protective resistance (protective resistance R1, protective resistance R2 or protective resistance R3) lost efficacy, electric current I through protector will become large, when this electric current I is the 1-1.5 times of normal rating electric current, this circuit can also normally work, when this electric current I exceedes 1.5 times of normal rating electric current, common port is departed from because electric current increase causes the heat that elastic conduction contact FU produces to make the elastic conduction contact FU originally contacted with common port that deformation occur, thus the disconnection of whole circuit is played a protective role.
May occur there is two-phase open circuit in three-phase in addition, now, electric current I is larger, and the heat of generation is higher, and elastic conduction contact FU more easily deformation occurs and is separated with common port simultaneously.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (4)
1. the phase-lacking protective device of a suction pump three phase electric machine; it is characterized in that; comprise protector; described protector has three terminals, three protective resistances and an elastic conduction contact; the equal correspondence of each described terminals is connected to a protective resistance one end; the other end of three protective resistances is connected by Y type; the common port of three described protective resistances is connected to an elastic conduction contact; described three binding posts connect three leading-out terminals of three phase electric machine respectively, and three ends of incoming cables of described three phase electric machine connect three phase mains respectively.
2. the phase-lacking protective device of a kind of suction pump three phase electric machine as claimed in claim 1, is characterized in that, the ratio range of the deformation threshold value of described elastic conduction contact and the load current value of protector is 1.4-1.6 times.
3. the phase-lacking protective device of a kind of suction pump three phase electric machine as claimed in claim 2, is characterized in that, the ratio range of the deformation threshold value of described elastic conduction contact and the load current value of protector is 1.5.
4. the phase-lacking protective device of a kind of suction pump three phase electric machine as claimed in claim 3, is characterized in that, described elastic conduction contact is aluminium alloy contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439283.XU CN204696662U (en) | 2015-06-25 | 2015-06-25 | A kind of phase-lacking protective device of suction pump three phase electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439283.XU CN204696662U (en) | 2015-06-25 | 2015-06-25 | A kind of phase-lacking protective device of suction pump three phase electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204696662U true CN204696662U (en) | 2015-10-07 |
Family
ID=54236915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520439283.XU Expired - Fee Related CN204696662U (en) | 2015-06-25 | 2015-06-25 | A kind of phase-lacking protective device of suction pump three phase electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204696662U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183331A (en) * | 2021-12-10 | 2022-03-15 | 浙江中杭水泵股份有限公司 | Remote control system of high-efficient dredge pump |
-
2015
- 2015-06-25 CN CN201520439283.XU patent/CN204696662U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183331A (en) * | 2021-12-10 | 2022-03-15 | 浙江中杭水泵股份有限公司 | Remote control system of high-efficient dredge pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103427392B (en) | A kind of electric system protection device | |
| CN201975754U (en) | Electric leakage overcurrent protection circuit | |
| CN202839463U (en) | Relay control circuit and electric cooker | |
| CN204696662U (en) | A kind of phase-lacking protective device of suction pump three phase electric machine | |
| CN101702604A (en) | Multi-functional electric motor protecting and starting device | |
| CN201038732Y (en) | Electrical equipment protecting device | |
| CN202586265U (en) | Power system protection device | |
| CN202004451U (en) | Secondary open circuit protection device of intelligent current transformer | |
| CN201149988Y (en) | Overvoltage protector for cutting low-voltage electric network zero curve | |
| CN102130439A (en) | Leakage protection switch with virtual connection preventing function | |
| CN104953537A (en) | Overload protection switching device | |
| CN201994631U (en) | Leakage protection switch with function of preventing virtual connection | |
| CN201877781U (en) | Ground power overvoltage reversed-polarity protector of power system | |
| CN203377449U (en) | Duel temperature regulation safety socket | |
| CN201733065U (en) | Low-voltage single-phase power source overvoltage protective device | |
| CN210604804U (en) | Three-phase alternating current automatic adjustment detection circuit | |
| CN202696519U (en) | Self-coupling voltage-reducing starting cabinet | |
| CN201302585Y (en) | Electric energy meter automatic burning-prevention device | |
| CN216980451U (en) | Relay protection circuit, intelligent switch and intelligent home control system | |
| CN204886124U (en) | Prevent overload protection switching device | |
| CN203761017U (en) | Short circuit current protection device of motor protector | |
| CN204538652U (en) | A kind of low-voltage customer over-and under-voltage circuit breaker | |
| CN203242858U (en) | Safe socket assembly with over-current protection | |
| CN204304410U (en) | A kind of motor and overload protection arrangement thereof | |
| CN203747384U (en) | Phase failure protection device for three-phase motor |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20160625 |