CN2511031Y - Contactless motor protection device - Google Patents
Contactless motor protection device Download PDFInfo
- Publication number
- CN2511031Y CN2511031Y CN 01274156 CN01274156U CN2511031Y CN 2511031 Y CN2511031 Y CN 2511031Y CN 01274156 CN01274156 CN 01274156 CN 01274156 U CN01274156 U CN 01274156U CN 2511031 Y CN2511031 Y CN 2511031Y
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- CN
- China
- Prior art keywords
- relay
- normally opened
- opened contact
- ammeter
- transformer
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- 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
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Abstract
The utility model discloses a non-contact electrical protection device, which is characterized in that one end of the power supply is connected with the one end of the AC contactor coil and the input end of the transformer respectively by the normally closed contacts of the relay J3, the other end of the power supply is connected with the other end of the AC contactor coil and the other input end of the transformer respectively by the button switches. The two output ends of the transformer are connected with the two input ends of the bridge rectifier respectively; one output end of the bridge rectifier is connected with one end of the capacitance C2, relay J3, relay J2, relay J1 and variable resistor. The utility model can simultaneously replace the thermal relay and the phase-failure protective device currently used, realizes super-charge protection and phase-failure protection.
Description
Technical field:
The utility model relates to the technical field of electric motor protecting, specifically a kind of contactless electric motor protective device.
Background technology: the prior motor protective device has: thermal relay overloading protective device, phase-lacking protective device, import motor have temperature-sensitive protective device etc.Because hot protective relaying device adopts the bimetal leaf structure, it is tired that long-term overcurrent produces sheet metal, thereby reduce or lose protective effect; Phase-lacking protective device takes electric current to change by three instrument transformers, protects motor by taking off the structure device, thus sensitivity can not guarantee, and can only protect phase shortage.
Summary of the invention:
The purpose of this utility model is to provide a kind of improved contactless three phase electric machine protective device, and it can solve some defectives of existing product, makes single protective device become the kinds of protect device, and guarantees the sensitivity of product.
The technical solution of the utility model is achieved in that a kind of contactless electric motor protective device, it mainly comprises housing, be contained in the relay in the housing, ammeter and instrument transformer, it is characterized in that: an end of power supply is connected to an end of ac contactor coil and an input of transformer respectively by the normally-closed contact of relay J 3, the other end of power supply is connected to the other end of ac contactor coil and another input of transformer respectively by push-button switch, two outputs of transformer are connected with two inputs of bridge rectifier respectively, an output of bridge rectifier respectively with capacitor C 2, relay J 3, relay J 2, one end of relay J 1 is connected with a variable-resistance end; Another output of bridge rectifier is connected with normally opened contact, the other end of capacitor C 1 and the emitter of triode T2 of normally opened contact J2-2, the relay J 2-1 of the normally opened contact J1-2 of capacitor C 2, relay, relay respectively; The other end of relay J 1 is connected with the collector electrode of triode T1, triode T2 respectively, and the emitter of triode T1 is connected with the base stage of triode T2, and the base stage of triode T1 is connected with an end of the variable-resistance other end and capacitor C 1 respectively; The other end of relay J 2 is connected with an end of the normally opened contact of relay J 2-1 and the contact pilotage of deciding of ammeter respectively, the other end of relay J 3 is connected with an end of the normally opened contact of relay J 2-2, and the end of the normally opened contact J1-2 of relay is connected with ammeter pointer; One end of instrument transformer is connected with an end of ammeter coil, and the other end of instrument transformer is connected with the end of the normally opened contact J1-1 of relay, and the other end of ammeter coil is connected with the other end of the normally opened contact J1-2 of relay.
The utility model compared with prior art has following characteristics:
1. utilize two leads that pass in the mutual inductor to detect three-phase current;
2. solve original device and need be connected on defective in the main circuit, become and need not series connection and produce
Give birth to same effect;
3. designed especially in ammeter and decided contact pilotage and moving contact pin, deciding contact pilotage is not having
During the stream situation and the ammeter pointer conducting; Moving contact pin can arbitrarily be set current value,
And conducting when ammeter pointer reaches set point;
4. can utilize the multiple load of a kind of control of product.The phase current of 220V or 380V
Be connected to the one side of ac contactor coil by relay J 3 normally-closed contacts, and in addition
One mutually electricity be connected on the another side of ac contactor coil by push-button switch, hand over
The stream contactor coil gets electric adhesive and the self-locking of process normally opened contact;
5. this design has reached the purpose of the big electric current of little Current Control;
Need not and main circuit contact, by instrument transformer, delay circuit, ammeter, friendship
The stream contactor is realized the control purpose;
7. the current conditions in the testing circuit at any time can substitute the thermal relay and the open phase protector that use at present simultaneously, realizes overloading protection and open-phase protection.
Description of drawings:
Fig. 1 is the circuit diagram of the utility model one embodiment
Embodiment:
The utility model will be further described below in conjunction with drawings and Examples.
The utility model mainly comprises housing, be contained in the relay in the housing, ammeter and instrument transformer, it is characterized in that: an end of power supply is connected to an end of ac contactor coil and an input of transformer respectively by the normally-closed contact of relay J 3, the other end of power supply is connected to the other end of ac contactor coil and another input of transformer respectively by push-button switch, push-button switch adopts two switches in the enforcement, one end of K switch 1 is connected with an end of power supply, the other end of K switch 1 is connected with an end of K switch 2 and an end of contactor normally opened contact respectively, the other end of K switch 2 is connected transformer respectively with an input of end of the other end of contactor normally opened contact and ac contactor coil and transformer two outputs are connected with two inputs of bridge rectifier respectively, an output of bridge rectifier respectively with capacitor C 2, relay J 3, relay J 2, one end of relay J 1 is connected with a variable-resistance end; Another output of bridge rectifier is connected with normally opened contact, the other end of capacitor C 1 and the emitter of triode T2 of normally opened contact J2-2, the relay J 2-1 of the normally opened contact J1-2 of capacitor C 2, relay, relay respectively; The other end of relay J 1 is connected with the collector electrode of triode T1, triode T2 respectively, and the emitter of triode T1 is connected with the base stage of triode T2, and the base stage of triode T1 is connected with an end of the variable-resistance other end and capacitor C 1 respectively; The other end of relay J 2 is connected with an end of the normally opened contact of relay J 2-1 and the contact pilotage of deciding of ammeter respectively, the other end of relay J 3 is connected with an end of the normally opened contact of relay J 2-2, and the end of the normally opened contact J1-2 of relay is connected with ammeter pointer; One end of instrument transformer is connected with an end of ammeter coil, the other end of instrument transformer is connected with the end of the normally opened contact J1-1 of relay, the other end of ammeter coil is connected with the other end of the normally opened contact J1-2 of relay, present embodiment is equipped with on the surface of ammeter decides contact pilotage and moving contact pin, so that contact with the set point moving contact pin at ammeter pointer, relay coil J2 gets electric back and keeps self-locking by the adhesive of J2-1 normally opened contact, the volume size of this device among the embodiment: W * L * H (length * wide * height)=6cm * 10cm * 6cm, estimated cost is less than 45 yuan.
Dynamic process of the present utility model is: when button switch K 1, K2 send electricity, transformer gets, through transformer output 6V voltage, 6V voltage is through the bridge rectifier output dc voltage, through capacitor C 1, variable resistor R time-delay, triode T1 base stage gets, this triode conducting (delay time is through the variable resistor scalable), relay coil J1 gets electric adhesive, electric apparatus coil J1-1 normally opened contact adhesive conducting, mutual inductor coil connects, because the other end of mutual inductor coil is connected on 2 of the J1-1 normally opened contacts relay normally open contact J1-2 adhesive simultaneously; And relay normally open contact J1-2 a bit connect ammeter pointer, another point connects the negative pole of DC power supply 6V, ammeter pointer is through time-delay indication real work electric current, thus when having avoided electric motor starting to the impulse current (passing the two-phase in the three-phase electricity in the transformer iron core) of ammeter coil, pointer.When motor overload turns round, ammeter pointer contacts with the set point moving contact pin, moving contact pin with decide the end that one of contact pilotage terminates at relay J 2 coils and relay normally open contact J2-1, another termination power cathode of relay normally open contact J2-1, and relay coil J2 is got; Relay coil J2 gets electric back and keeps self-locking by normally opened contact J2-1 adhesive, makes relay J 3 coils simultaneously, by the adhesive conducting of relay J 2-2 normally opened contact, makes relay J 3 coils get electric adhesive; The negative pole of a bit succeeding electric apparatus coil of relay J 2-2 normally opened contact, another point source negative pole (relay J 3 normally-closed contacts a bit connect 220V or 380V power supply, and another point connects the one side of transformer).The ac contactor coil dead electricity discharges, thereby has protected motor.When the situation of motor in phase shortage running, current of electric strengthens rapidly and ammeter pointer is contacted with the set point moving contact pin, and repeat above-mentioned action motor is protected, owing to the design of only having taked a mutual inductor by two-phase current.So when not passing through a mutually electric phase shortage of mutual inductor; there is not electric current to pass through among the ammeter A; ammeter pointer is replied zero-bit; contact and make relay J 2 coil adhesive self-lockings and decide contact pilotage with set point; relay J 3 coil adhesives and repeat above-mentioned action; make the contactor coil dead electricity, thereby protected motor.Because the current value that the ammeter adjustable settings is measured is so can be fit to the monitoring and the protection of any current motor.
Claims (3)
1, a kind of contactless electric motor protective device, it mainly comprises housing, be contained in the relay in the housing, ammeter and instrument transformer, it is characterized in that: an end of power supply is connected to an end of ac contactor coil and an input of transformer respectively by the normally-closed contact of relay (J3), the other end of power supply is connected to the other end of ac contactor coil and another input of transformer respectively by push-button switch, two outputs of transformer are connected with two inputs of bridge rectifier respectively, an output of bridge rectifier respectively with electric capacity (C2), relay (J3), relay (J2), one end of relay (J1) is connected with a variable-resistance end; Another output of bridge rectifier is connected with the normally opened contact (J1-2) of electric capacity (C2), relay, the normally opened contact (J2-2) of relay, the normally opened contact of relay (J2-1), the other end of electric capacity (C1) and the emitter of triode (T2) respectively; The other end of relay (J1) is connected with the collector electrode of triode (T1), triode (T2) respectively, the emitter of triode (T1) is connected with the base stage of triode (T2), and the base stage of triode (T1) is connected with the end of the variable-resistance other end with electric capacity (C1) respectively; The other end of relay (J2) is connected with an end of the normally opened contact of relay (J2-1) and the contact pilotage of deciding of ammeter respectively, the other end of relay (J3) is connected with an end of the normally opened contact of relay (J2-2), and an end of the normally opened contact of relay (J1-2) is connected with ammeter pointer; One end of instrument transformer is connected with an end of ammeter coil, and the other end of instrument transformer is connected with an end of the normally opened contact of relay (J1-1), and the other end of ammeter coil is connected with the other end of the normally opened contact of relay (J1-2).
2, by the described a kind of contactless electric motor protective device of claim 1; it is characterized in that: push-button switch adopts two switches; one end of switch (K1) is connected with an end of power supply; the other end of switch (K1) is connected with an end of switch (K2) and an end of contactor normally opened contact respectively, and the other end of switch (K2) is connected with a other end and end of an ac contactor coil and input of transformer of contactor normally opened contact respectively.
3, by the described a kind of contactless electric motor protective device of claim 1, it is characterized in that: be equipped with on the surface of ammeter and decide contact pilotage and moving contact pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01274156 CN2511031Y (en) | 2001-12-12 | 2001-12-12 | Contactless motor protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01274156 CN2511031Y (en) | 2001-12-12 | 2001-12-12 | Contactless motor protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2511031Y true CN2511031Y (en) | 2002-09-11 |
Family
ID=33678875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01274156 Expired - Fee Related CN2511031Y (en) | 2001-12-12 | 2001-12-12 | Contactless motor protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2511031Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279150A (en) * | 2013-05-30 | 2013-09-04 | 苏州博涛机电设备有限公司 | Protection circuit of temperature controller output contact |
-
2001
- 2001-12-12 CN CN 01274156 patent/CN2511031Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279150A (en) * | 2013-05-30 | 2013-09-04 | 苏州博涛机电设备有限公司 | Protection circuit of temperature controller output contact |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |