CN2160984Y

CN2160984Y - Coil overheat protector used by matching with ac contactor

Info

Publication number: CN2160984Y
Application number: CN 93217001
Authority: CN
Inventors: 吕五代
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-30
Filing date: 1993-06-30
Publication date: 1994-04-06
Anticipated expiration: 2003-06-30

Abstract

The utility model discloses a coil overheat protector used by matching with an AC contactor, which can directly control the on-off of a power supply of a device under the assistance of coil temperature. Main elements of the utility model are a set of a bimetallic thermocutouts which are in mutual and in series connection; the outer surfaces of the bimetallic thermocutouts are provided with insulated protective layers made of flexible materials, etc. When the utility model is used, the insulated protective layers made of flexible materials are respectively stuck on the surfaces of protected coils. When the coil temperature is raised no matter whether the raise of the temperature is caused by the reason of phase lack or other reasons, the utility model can in time cut off the power supply to prevent the coils from being burned by overheating temperature. The utility model has the characteristics of sensitive control, reliability, simple structure, low cost, etc.

Description

Coil overheat protector used by matching with ac contactor

The utility model relates to a kind of coil overtemperature protection system that is used with A.C. contactor.

Electric equipment is in operation, and often because electric current is excessive, causes that coil temperature is too high, makes electrical equipment overheated and burn.For avoiding this class accident to take place, the way that adopts is usually, and thermal relay is installed in circuit, protector and thermostat etc. or set up protective circuit, and as at present, the excessive current flow in motor phase failure of market sale, short-circuit protector etc.These protective devices all are outside the equipment of being installed on, and use the variation of electric current in the circuit to reflect what coil temperature changed.Yet the size of current that the electric apparatus coil variations in temperature is passed through with it also has suitable difference, the temperature of coil also with ambient temperature, factors such as ventilation condition are relevant.Therefore, can not reflect sensitive, exactly that by the electric current variation coil temperature changes, also just be difficult to the overheated burnout failure of elimination coil.

When existing double-metal sheet type thermal protector uses, be it to be serially connected with the whole negative stream of disconnecting all flows through thermal protector in the operating circuit, so large-power occasions can't be used.

Task of the present utility model provides the coil overtemperature protection system that a kind of and A.C. contactor are used, and it is the control coil temperature directly, as long as coil temperature can cut off the electricity supply rapidly above allowable temperature, guaranteeing that coil is not overheated burns.

For solving above-mentioned task; the technical solution adopted in the utility model is: make a kind of thermel protection device that is used with A.C. contactor; this device is with behind one group of thermal protector polyphone; the flexible protective material of the sticking one deck insulation in outside; be flexible banded structure; there is lead-out wire at two ends, simultaneously are coated with adhesive at insulating material, and surface of pressure-sensitive adhesive is with separate paper.During use, remove separate paper, thermal protector is pasted on corresponding coil surface, every group of coil has the corresponding with it stickup of a thermal protector at least, then, reinforces with strap, irritates lacquer and solidifies.With this device serial connection in the A.C. contactor circuit.When coil temperature raise, the thermal protector temperature that adheres on it also increased, and when surpassing set point of temperature, thermal protector disconnects, and A.C. contactor is disconnected, and then coil temperature is controlled.Thermal protector in the such scheme is to adopt the bimetal leaf structure.

Such scheme can be used for alternating current motor, hands over the coil protect of all high-power electric appliance equipment such as Chinese generator and electric welding machine.

The present invention is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of the utility model embodiment

Fig. 2-the 1st, the fundamental diagram of the utility model embodiment.

Fig. 2-the 2nd, A place enlarged diagram.

As shown in Figure 1; the coil overtemperature protection system is by two, three or polylith thermal protector 1; be connected in series mutually with lead 2; it is bonding that yellow cloth silk fabric insulating tape 3 and thermal protector 1 stick with glue agent 7; adhesive sticker is applied to yellow cloth silk fabric insulating tape one side; and separate paper 5 protections are arranged, the lead-out wire 6 of protective device is pressed in the accompanying drawing 2-2 place in circuit.Thermal protector 1 is pasted on respectively on the corresponding motor winding 10, guarantees that every group of coil has at least a thermal protector to paste with it, and fastening with strap, irritate lacquer and solidify.During work, press starting switch QA, QC coil electricity at this moment, QC main contacts are connected and are made motor operation, and the QC auxiliary contact are connected and carried out self-insurance.Be in operation, if coil 10 temperature raise, thermal protector 1 temperature that then adheres on it also raises.When surpassing permissible value, thermal protector disconnects, ac contactor coil thereby outage, and main contacts disconnects, the motor stall, coil temperature no longer raises.Protected motor winding.

Overtemperature protection system is used for electric welding machine; it is the primary winding surface that the thermal protector that will need quantity is pasted on electric welding machine; fastening with strap; irritate lacquer and solidify protective device and A.C. contactor polyphone; when electric welding machine primary winding temperature was too high, thermal protector disconnected, and overtemperature protection system disconnects; A.C. contactor is cut off the electricity supply rapidly, and the electric welding machine coil is protected.

Overtemperature protection system is used for alternating current generator, is that the thermal protector that will need quantity is pasted on each corresponding coil surface respectively, guarantees that every group of coil has at least a thermal protector to paste on it.Overtemperature protection system is serially connected with in the A.C. contactor circuit.When coil temperature raise, thermal protector disconnected, and then thermel protection device disconnects, and A.C. contactor cuts off the generator output circuit rapidly.Coil temperature no longer raises.

Owing to adopted direct device by coil temperature control appliance on/off in the such scheme, made it have following advantages:

1, this device is too high for the coil temperature that any reason causes, and defencive function is arranged. Make coil obtain reliable overtemperature protection.

2, this device is when the control appliance power supply, without other conversion, so its control accuracy height is highly sensitive.

3, this apparatus structure is simple, and is easy to use, cheap.

Claims

1, the coil overtemperature protection system that is used of a kind of and A.C. contactor; it is characterized in that: it comprises one group of thermal protector; contact mutually between the thermal protector; its outside is stained with the flexible material protective layer of insulation; be flexible banded structure, protective layer one side scribbles adhesive, and thermal protector is affixed on the coil during use; and contact mutually with A.C. contactor, thermal protector can heat up simultaneously with coil.

2,, it is characterized in that said thermal protector adopts the bimetal leaf structure according to the described coil overtemperature protection system of claim 1.

3,, it is characterized in that said one group of thermal protector is made up of two, three or polylith thermal protector according to the described coil overtemperature protection system of claim 1.