CN201122558Y

CN201122558Y - Temperature current protector

Info

Publication number: CN201122558Y
Application number: CNU2007201255037U
Authority: CN
Inventors: 简·斯迪克尔
Original assignee: Sensata Technologies Inc
Current assignee: Sensata Technologies Inc
Priority date: 2007-08-17
Filing date: 2007-08-17
Publication date: 2008-09-24
Anticipated expiration: 2017-08-17

Abstract

The utility model relates to a temperature current protector, which comprises a casing, two metal sheets, a moving contact, a fixed contact and a conducting base plate. The two metal sheets are fixed at the inner side of the casing, the moving contact is arranged at the pendent tail end of the two metal sheets, the moving contact corresponds to the fixed contact fixed on the conducting base plate, one end of the conducting base plate is connected with a first outer conducting wire, and the two metal sheets are connected with a second outer conducting wire. The temperature current protector is characterized in that the conducting base plate is composed of two separating parts, and the two separating base plate parts are bridged over by utilizing a heater bridge; the fixed contact is fixed at one base plate part, thereby the two metal sheets, the moving contact, the fixed contact, the two separating base plate parts and the heater between the separating base plate parts can form a series circuit.

Description

The temperature current protector

Technical field

The utility model relates to a kind of temperature current protector, relates in particular to the electromechanical motor protector that a kind of automotive field uses.

Background technology

Common motor is with in the protector, and arc bimetal leaf is made by two kinds of permanent engagement different materials together usually; When ambient temperature raises and/or the electric power that flows through bimetal leaf when making that bimetal leaf is heated, in the bimetal leaf metal of a side than the expansion of metal of opposite side many, then bimetal leaf integral body just can be to a lateral bending song that expands fewly, cause the bimetal leaf saltus step, the moving contact of bimetal leaf separates with fixed contact, and bimetal leaf can provide good thermal stability under the overload environment like this.

Particularly, because bimetal leaf forms recess, so bimetal leaf can't be slowly crooked.When the high thermal expansion side of bimetal leaf has been gathered enough heating power, then can overcome arc resistance, make the bimetal leaf saltus step become convex.When cooling off, bimetal leaf can be returned to original recessed position through opposite process.

Summary of the invention

The purpose of this utility model is that above-mentioned traditional motor protecter is proposed to improve, and a kind of novel motor protecter is provided.

According to temperature current protector of the present utility model, comprise housing, bimetal leaf, moving contact, fixed contact and conductive soleplate, described bimetal leaf is fixed on the inboard of described housing, its end that dangles is provided with moving contact, described moving contact is corresponding with the described fixed contact on being fixed on described conductive soleplate, one end of described conductive soleplate links to each other with first outer lead, described bimetal leaf links to each other with second outer lead, it is characterized in that, described conductive soleplate is made of two divided portion, and described two bottom parts that separate utilize the heater bridge joint; Described fixed contact is fixed therein on the bottom parts, and described thus bimetal leaf, described sound contact, described two bottom parts that separate and heater electricity therebetween can constitute series circuit.

According to the utility model, described heater is a heating wire, is located immediately at described bimetal leaf below, because two parts of bridge joint conductive soleplate and be cascaded with bimetal leaf 2, thereby make the whole protecting device sensitive more to electric current.If according to circumstances suitably increase the resistance of heater, then can reduce the opening time of whole protecting device.Owing to can be bigger, for example pass through the material of heating wire and the thickness of heating wire, the selection of length in addition, can make protector of the present utility model be applicable to nearly all application conditions the scope that heater configuration is selected.

Preferably, described housing is made by electric conducting material, and described bimetal leaf links to each other with second outer lead via described housing.

Preferably, the temperature current protector also comprises the packing ring that is located between described housing and the described base plate, and described packing ring is provided with opening and passes this opening contact to allow above-mentioned sound contact; Described housing and described base plate are bonded together across described packing ring.

Preferably, described housing is provided with the edge in its both sides, and described base plate and described packing ring are provided with flank in its both sides, and the flank of described base plate is bonded together described housing and described base plate on the edge of flank bending at described housing of described packing ring.

Preferably, two separate sections of described base plate are respectively equipped with at least one perforate on its both sides flank, described housing has corresponding projection respectively in its both sides of the edge, so that above-mentioned projection is bonded in the perforate of described base plate across described packing ring when described housing and described base plate are engaged.

Preferably, described packing ring is made by the Nomex band that both sides have the color indication.

Preferably, described bimetal leaf utilizes laser welding to be fixed on described housing inboard, and its weld is formed with a plurality of Laser Welding contacts.

Preferably, described bimetal leaf utilizes insert to be fixed on described housing inboard, and described insert is provided with solder-bump so that described bimetal leaf is clipped between described housing inboard and the described insert in the side towards the shell inboard.

Preferably, described bimetal leaf is arranged on the place, concave part of described housing inboard, so that temperature correction.

Description of drawings

Fig. 1 is the decomposing schematic representation of the utility model protector.

Fig. 2 is the schematic diagram after the assembling of the utility model protector.

Fig. 3 a and Fig. 3 b illustrate the assembling schematic diagram of heater and base plate in the utility model protector.

Fig. 4 a and Fig. 4 b illustrate the schematic diagram of the band that is used to make packing ring in the protector of the utility model preferred embodiment.

Fig. 5 a and Fig. 5 b are the schematic diagrames that uses the laser welding bimetal leaf in the utility model protector.

Fig. 6 a and Fig. 6 b are the fixedly schematic diagrames of the bimetal leaf of another embodiment of the utility model.

Fig. 7 a and Fig. 7 b show the schematic diagram that the utility model protector is carried out temperature correction.

Embodiment

Fig. 1 and Fig. 2 illustrate the internal structure schematic diagram and the external structure of the utility model protector.This thermal protector comprises the base plate 8 of housing 1, bimetal leaf 2, moving contact 3, insert (slug) 4, packing ring 5, heater 6, fixed contact 7 and conduction.Conductive soleplate 8 is divided into two parts; Fixed contact 7 can utilize holder or directly be fixed on the part of conductive soleplate 8, and its heater 6 by " Z " font (being heating wire in the present embodiment) is electrically connected to another part of conductive soleplate 8, links to each other with first outer lead then; One end of housing 1 links to each other with another outer lead (second outer lead), and bimetal leaf 2 is welded on the inboard of concave part, housing 1 top by insert 4, and the moving contact 3 that is positioned at the free end that bimetal leaf 2 overhangs is relative with fixed contact 7.Above-mentioned two outer leads also can enter from the housing both sides.

Packing ring 5 is placed between housing 1 and the base plate 8, itself and base plate 8 all have the flank to upper process in both sides, so that make the flank bending of packing ring 5 and base plate 8 on the flattened edge of housing 1 both sides, realize fixing with housing, simultaneously packing ring 5 make housing 1 and base plate 8 mutually electricity isolate.Preferably housing 1 can be respectively equipped with 2 projections on its both sides of the edge, 8 two parts of base plate also can correspondingly be provided with perforate (amounting to 4) in the flank of its both sides, like this when assemble case 1 and base plate 8 flank of base plate 8 upwards the bending projection that makes housing 1 both sides penetrate perforate in base plate 8 flanks across packing ring 5 respectively, obtain stable assembling as shown in Figure 2.It is contemplated that each separate section of described base plate can be respectively equipped with more than one perforate on its both sides flank.

External structure for protector; except the above-mentioned scheme that the utility model proposes; it is also contemplated that the various schemes of using prior art; above-mentioned housing 1 can also be an encapsulating housing; comprise above-mentioned bimetal leaf 2, moving contact 3, insert 4, packing ring 5, heater 6, fixed contact 7 and conductive soleplate 8 in it, and bimetal leaf 2 is fixed on, and housing is inboard to link to each other with second outer lead directly still.

Above-mentioned packing ring 5 can use Nomex packing ring (it has made up mechanical strength and good high-temperature stability), and it can be made by the Nomex band.The Nomex band that is used to make packing ring 5 according to preferred embodiment is shown in its both sides band edge as Fig. 4 b and has been identified color, so that make final protector have color coding (shown in Fig. 4 a), is used to be convenient to installation affirmation terminal.

When the utility model product during as the protector in the motor; above-mentioned housing 1 is a metal shell, and two leads are connected in the distributing system of motor etc., and the corresponding protection device adapts to the electrical characteristic/thermal characteristics of motor etc.; when the steady running of no abnormal ground such as motor, protector is failure to actuate.Protector of the present utility model also can be used as overcurrent protector.

During the motor stabilizing running, export to another lead by base plate 8, heater 6, fixed contact 7, moving contact 3, housing 1 from the electric current of one of lead (being shown in the below) input as Fig. 3 b.Perhaps use with its opposite polarity.

When generation is unusual; the abnormal heating of the coil of motor etc. can be via base plate 8; heater 6; fixed contact 7; moving contact 3; the abnormal electrical that housing 1 and taking place flows through motor etc. when unusual fails to be convened for lack of a quorum and makes base plate 8; heater 6 and housing 14 heatings; bimetal leaf 2 these heats of induction that housing 1 is provided with below; when it reaches the default reversal temperature of bimetal leaf 2; bimetal leaf 2 action of reversing; make moving contact 3 and fixed contact 7 separately; thereby blocking-up is supplied with to the power supply of motor etc.; moving contact 3 and fixed contact 7 repeat opening and closing movement because of the action of bimetal leaf 2; thereby the structure member of motor etc. etc. is controlled at below the temperature that can cause damage, thereby plays the effect that protection motor etc. is avoided scaling loss.

Especially, shown in Fig. 3 a and 3b, heater 6 is electrically connected two parts of base plate 8, and is cascaded with bimetal leaf 2, makes the whole protecting device sensitive more to electric current.If according to circumstances suitably increase the resistance (example " Z " font heater 6 promptly in order to increase its resistance heating amount) as used herein of heater, the opening time that then can reduce the whole protecting device.Owing to can be bigger, for example pass through the material of heating wire and the thickness of heating wire, the selection of length in addition, can make protector of the present utility model be applicable to nearly all application conditions the scope that heater configuration is selected.

Shown in Fig. 5 a and 5b; the utility model protector preferably uses laser welding that bimetal leaf 2 and housing 1 are welded together; this many laser solder joint 51 is compared single as Fig. 5 a and is welded to connect and can reduces current density, and owing to does not have and divide weldering the dangerous welding procedure that can significantly simplify bimetal leaf and housing.

Fig. 6 a and Fig. 6 b show the welding fixed structure of the utility model bimetal leaf.As shown in the figure, insert 4 is provided with solder-bump 41, utilizes the solder-bump 41 of insert 4 bimetal leaf 2 to be clipped between the inboard of insert 4 and housing 1 concave part utilizing for example Laser Welding, electric resistance welding etc. bimetal leaf 2 to be welded in the process on housing 1 inboard.

Fig. 7 a and Fig. 7 b show to housing 1 apply active force make housing 1 together with its bimetallic assembly to the fixed contact prebuckling, carry out temperature correction.Particularly, the terminal prebuckling (as arrow indication among the figure) downwards by to housing 1 concave part can increase certain prestressing force to bimetal leaf 2, thereby make the operating temperature respective change of bimetal leaf.Amount of bow by control bimetal leaf 2 can make the operating temperature of bimetal leaf 2 reach needed temperature value.

According to temperature current protector of the present utility model, preferably use in automobile motor, as HVAC hair-dryer, secondary air pump and power sliding door etc.

Claims

1. temperature current protector; comprise housing, bimetal leaf, moving contact, fixed contact and conductive soleplate; described bimetal leaf is fixed on the inboard of described housing; its end that dangles is provided with moving contact; described moving contact is corresponding with the described fixed contact on being fixed on described conductive soleplate; one end of described conductive soleplate links to each other with first outer lead, and described bimetal leaf links to each other with second outer lead

It is characterized in that described conductive soleplate is made of two divided portion, described two bottom parts that separate utilize the heater bridge joint; Described fixed contact is fixed therein on the bottom parts, and described thus bimetal leaf, described sound contact, described two bottom parts that separate and heater electricity therebetween can constitute series circuit.

2. temperature current protector according to claim 1 is characterized in that described heater is a heating wire, is located immediately at described bimetal leaf below.

3. temperature current protector according to claim 1 is characterized in that described housing is made by electric conducting material, and described bimetal leaf links to each other with second outer lead via described housing.

4. temperature current protector according to claim 3 is characterized in that also comprising the packing ring that is located between described housing and the described base plate, and described packing ring is provided with opening and passes this opening contact to allow above-mentioned sound contact; Described housing and described base plate are bonded together across described packing ring.

5. temperature current protector according to claim 4; it is characterized in that; described housing is provided with the edge in its both sides; described base plate and described packing ring are provided with flank in its both sides; the flank of described base plate is bonded together described housing and described base plate on the edge of flank bending at described housing of described packing ring.

6. temperature current protector according to claim 4; it is characterized in that; two separate sections of described base plate are respectively equipped with at least one perforate on its both sides flank; described housing has corresponding projection respectively in its both sides of the edge, so that above-mentioned projection is bonded in the perforate of described base plate across described packing ring when described housing and described base plate are engaged.

7. temperature current protector according to claim 4 is characterized in that, described packing ring is made by the Nomex band that both sides have the color indication.

8. temperature current protector according to claim 1 is characterized in that, described bimetal leaf utilizes laser welding to be fixed on described housing inboard, and its weld is formed with a plurality of Laser Welding contacts.

9. temperature current protector according to claim 1; it is characterized in that; described bimetal leaf utilizes insert to be fixed on described housing inboard, and described insert is provided with solder-bump so that described bimetal leaf is clipped between described housing inboard and the described insert in the side towards the shell inboard.

10. according to arbitrary described temperature current protector among the claim 1-9, it is characterized in that described sheet metal is arranged on the place, concave part of described housing inboard, so that temperature correction.