CN1140509A

CN1140509A - Thermal cut-off

Info

Publication number: CN1140509A
Application number: CN 95191570
Authority: CN
Inventors: 沃尔特·霍尔威克
Original assignee: INTER CONTROL HERMANN KOEHLER ELEKTRIK GmbH and CO KG
Current assignee: INTER CONTROL HERMANN KOEHLER ELEKTRIK GmbH and CO KG; INTER CONTROL Hermann Koehler Electrik GmbH and Co KG
Priority date: 1994-02-10
Filing date: 1995-02-09
Publication date: 1997-01-15
Also published as: WO1995022159A1; EP0744079A1; DE4404167A1; DE4404167C2

Abstract

The invention relates to a thermal cut-off(1) which interrupts a current path passing through it when an ambient triggering temperature is exceeded, with a housing(2) from which project two contacts(3, 4) to form the current path via which a closed contact section on the inside(6) of the housing is bridged when the cut-off is not triggered, and with a heat-sensitive component(7) which, when the contacts is made, applies spring pre-tension to the moving contact(5) which, when the heat-sensitive component(7) breaks, interrupts the contact section owing to the force of a breaking spring(9) acting on it in the contact-breaking direction, in which the contact section has two fixed contacts(10, 11) side-by-side inside the housing(2), the contact surfaces(12, 13) of which are directed substantially towards the heat-sensitive component(7), and the moving contact(5) lies on the contact surfaces(12, 13) like a movably supported bridge component in relation to the two fixed contacts(10, 11) arranged side-by-side.

Description

Thermocutout

The present invention relates to a kind of described thermocutout of claim 1 preamble that has.In addition, the invention still further relates to a kind of this described method of the thermocutout of preamble section feature before of claim 1 that has of making.

As prior art, a kind of thermocutout (Prospekt " Microtemp Thermal Cutoffs ") was disclosed, it when surpassing the trip temperature value, cut off one by it current circuit and have a safeties shell, from this shell, stretch out two wiring contacts, so that constitute a current circuit, the chamber inside lap in the enclosure of these two wiring contacts by a contact-segment that when insurance does not respond, is communicated with by a mobile contact, and in contact-segment, being provided with a heat-sensitive element, it is communicated with the position current collector is imposed prestressing force by spring-loaded in the contact.When the disconnection of heat-sensitive element was mobile, this current collector was owing to the elastic force that disconnects the disconnection spring of directive effect towards contact interrupts contact-segment.

Existing thermocutout therefore need take more expensive insulation measures, and whole insurance shell is closed, so this has shortcoming because the transmission of its electric current is to be undertaken by the shell that installs.Show that in addition in the safeties in the prior art, its response time is longer relatively.

By U.S. Pat-PS4,673,909 disclosed a kind of described thermocutout of preamble section feature before of claim 1 that has.Its response characteristic accurately is subjected to very big infringement, even because inappreciable damage, for example the depression of shell or extruding all can cause the obstruction at the moving-member of safeties inner chamber, so that when reaching trip temperature, safeties can not respond at all.

The objective of the invention is to, thermocutout with the described feature of claim 1 is done following improvement, even it can and especially can be made fully automatically with plain mode, and have a kind of weak point and the response characteristic determined thus, even and response performance accurately that also can the guarantee insurance device when hull outside is subjected to mechanical load.This purpose will reach by the described feature of claim, improvement with advantage will be reached by dependent claims 2-19, and a kind of particularly advantageous of this safeties especially will illustrate by claim to a method 20 for the primacy of the assembling of automation.

Core of the present invention is that the guiding of the moving-member in safeties separates with the safeties outer wall, even so that can also can move in the clear when being subjected to mechanical load by axially movable parts.This point is guaranteed that by the looped guide element of separating this guiding piece has a high radial stability of resisting the pressure of ecto-entad owing to its loop configuration on the one hand, because this structure makes it be particularly suitable for full automatic assembling process.As annular element, necessary words can be packed into simply together with other element and be held in its parts, therefore do not need special centering measure.

In the section that the insurance shell is installed in outer casing underpart by three structures formed of part and guiding device is especially to have advantage, because form a kind of double protection for the moving-member in the chamber in the enclosure by this way.

If like that induction element is designed to be formed by the bottom of the insulating element that is pot shape basically according to claim 5, owing to holding with the transmission pin, the sleeve that is full of scolder combines, in assembling process can with plain mode realize insulating element its bottom and pin in insulating element and sleeve with respect to the aligning of insulating element, therefore corresponding each parts only need insert simply mutually.

The invention will be further described below with reference to embodiment shown in the figure:

The central longitudinal cross section of Fig. 1 safeties;

The sectional view that compresses the contact that has a change among Fig. 2 Fig. 1;

Fig. 3 is according to the view of arrow directions X among Fig. 1 and Fig. 2;

The vertical view of first kind of form of implementation of Fig. 4 holddown spring;

A sectional view of the holddown spring of second kind of form of implementation of Fig. 5;

Fig. 6 central cross-section figure as shown in Figure 1, wherein, outer casing underpart spare 24 is made up of two sections 24a and 24b.

The different forms of implementation of the bottom section of the upper-part of Fig. 7-11 pot shape.

At first at Fig. 1, described a thermocutout 1 here, it has an insurance shell 2, stretches out two

line contacts

3,4 from this shell, in order to constitute a current circuit.By these two line contacts, become a contact-segment that when insurance is not responded to, is communicated with by a current collector 5 in 6 inside laps of housing inner chamber.Has a temperature-sensitive element 7 in addition, it in advance applies power by spring-loaded to current collector 5 in the contacting position, this current collector heat-sensitive element 7 disconnect when mobile since one disconnect the elastic force that direction 8 acts on the disconnection spring 9 on the current collector along the contact and make the contact-segment disconnection.

Contact-segment comprises two adjacent

fixed contacts

10,11 that are in the insurance shell 2, and their contact-making

surface

12,13 is basically towards the direction of heat-sensitive element 7.Current collector 5 drops on the contact-making

surface

12,13 with a kind of form of bridge component of mobile support.

7 pairs of current collectors 5 of heat-sensitive element of being made up of a sleeve 14 that holds (melting) scolder and fixing transmitting element 15 within it apply a pressure component, this component will run through two

contacts

12,13 and the plane of launching sections between two fixed contacts, promptly pass in the middle of both.

As not too at length seeing among Fig. 1 and 2, that current collector is designed to is solid, rounded plate basically, on 10,11 1 sides of fixed contact dorsad of current collector 5, be provided with a holddown spring 17 that ensures its contacting pressure, it is shown specifically and is designed to star spring 18 in Fig. 4, it has avris pin 19, and these avris pin protrude from the core 20 of star spring 18 and overarch when star spring 18 is loose.By transmitting element 15 extruding, the not end 21 of star spring pin 19 is bearing on the current collector 5 core 20 of star spring 18 when the contacting position.

Provided another kind of holddown spring form of implementation by Fig. 5, at this, holddown spring is plate 22 that arch upward to both sides and that curve U-shaped when being one loose (unloading).

Can be clear that from Fig. 1 and 2 cut-out spring 9 is located at an annular, surround in the housing groove 23 of fixed

contact

10,11, realize a kind of cut-out spring 9 stabilisation thus together with the compact configuration at thermocutout middle part.

Fixed

contact

10,11 is designed to be parallel to the capitiform end of the interior connection contact of lower housing portion part 24.Connecting

contact

3 and 4 25 stretches out from the bottom side.

Transmitting element 15 is located in the director element 26 that ring forms basically in housing upper-part 27, wherein, director element 26 is formed by a bottom that is the insulating element 28 of pot shape basically, and this insulating element utilizes an annular flange flange 29 to be bearing on the upper limb 30 of housing bottom 24 and be fixing thus.

The sleeve 4 that holds scolder 31 is positioned at first chamber 32 of sealing basically at the housing upper area.Fixed

contact

10,11, current collector 5, holddown spring 17 and cut-out spring 9 are positioned at second chamber 33 at the base closed of housing central region.First chamber 32 and second chamber 33 are separated by the ringwise director element of establishing for transmitting element 15 26.

Housing upper-part 27 and lower housing portion part 24 and metal pan shape upper-part 40 overlap joints, the sleeve 14 that has a scolder 31 be attached on pot inboard of the end face of shape upper-part 40 42 41 and thus with its maintenance thermo-contact very closely.

In the zone of lower part of frame part 24, be provided with a flange 45 that the downward staged of diameter of the housing is diminished.Pot shape metal upper-part 40 its lower limbs extend to staged flange 45 and have a flanging 46 at that.

Between the inboard on the upper limb 30 of insulating element 28 and pot shape metal shell top 40, a gap 48 is arranged at the assembling terminal location, guarantee by it, a pot shape upper-part 40 is pressed onto on the melt sleeve, transmitting element is pressed onto on the holddown spring 17, and current collector 5 is contacted with fixed contact, be communicated with the position thereby can enter.

For making it firm, the end face 39 of upper-part 40 is provided with a dish type mold pressing seal, and sleeve 4 is attached on its inboard 41.

Fig. 6 is almost in full accord with Fig. 1, and just lower housing portion 24 is made up of two parts 24a and 24b, so that for some material, can guarantee a kind of better and simpler manufacturability of housing bottom 24 (a and b).

Fig. 7～11 show pot different forms of implementation of shape cover tube bottom.Have the dish type widened section 50 of the bottom section 42 that a sleeve 40 executes in the form of implementation shown in Figure 7, thermo-contact is fixed on the pedestal 54 well so that utilize clamp system 52 to realize that sleeves 40 are simple.

In the embodiment shown in fig. 8, the bottom section 42 of sleeve 40 is provided with a fixed connecting plate 56 with a hole 58, so that make the sleeve 40 can be without a doubt and other heat-sensitive element riveted and fixed for example.In addition, also can fixed connecting plate (56) be set at bilateral.

In the embodiment shown in fig. 9, sleeve 40 is provided with the extension 60 of an annular flange flange formula, and it aligns with sleeve lateral wall substantially.

In the embodiment shown in fig. 10, the bottom section of sleeve 40 is provided with a thickening layer 62.

In the embodiment shown in fig. 11, a ring flange 70 is in the interior zone of bottom section 42 and ground, end formation altogether with it.All forms of implementation shown in Fig. 7 to 11 can be used as waters foundry goods, die casting or stamping parts production, so retaining

element

50,56,60,62 and 70 is designed to and a pot shape sleeve 40 is integral itself, and guarantee the high heat conduction in a kind of sleeve district thus.

Claims

1. a thermocutout (1), it has a safeties shell (2), from this shell, stretch out two line contacts (3 that are used for constituting a current circuit, 4), these two line contacts by one when safeties do not respond, the contact-segment that is communicated with by a current collector (5) is in the inside lap of housing inner chamber, this thermocutout band has a heat-sensitive element (7), it is communicated with the position and by spring-loaded current collector (5) is applied power in advance in the contact, this current collector when the disconnection of heat-sensitive element (7) is mobile owing to an elastic force that disconnects direction (8) effect disconnection spring (9) thereon along the contact disconnects contact-segment, wherein, contact-segment has two adjacent fixed contacts (10 that are in the safeties shell (2), 11), their contact-making surface (12,13) basically towards the direction of heat-sensitive element (7), and the fixed contact of relative two the adjacent settings of current collector (5) (10,11) drop on contact-making surface (12 with a kind of form by the mobile bridge component that supports of a transmitting element (15), 13) on, it is characterized in that:

Transmitting element (15) is one and transmits pin, is directed in the hole that it separates with the housing outer wall at, independently looped guide element (26).

2. according to the described thermocutout of claim 1, it is characterized in that:

Heat-sensitive element (7) is a sleeve that fills up with scolder (14), transmits pin and is fixed in the described sleeve.

3。According to claim 1 or 2 described thermocutouts, it is characterized in that:

Safeties shell (2) is made up of three parts at least basically and is had a lower housing portion part (24) of being made up of two sections (24a, 24b), and comprise an insulated part (28) and a metal the pot shape upper-part (40), lower housing portion part (24) and insulated part (28) with two sections (24a, 24b) are overlapped.

4. according to the described thermocutout of claim 2, it is characterized in that:

Director element (26) is located in the section of lower housing portion part (24).

5. according to each described thermocutout of aforesaid right requirement, it is characterized in that:

Director element (26) is formed by the base plate of the insulated part that is pot shape basically (28).

6. according to the described thermocutout of claim 5, it is characterized in that:

Insulated part (28) utilizes an annular flange flange (29) and is supported on the upper limb of lower housing portion part.

7. according to each described thermocutout of claim, it is characterized in that:

The sleeve (14) that holds scolder (31) is located in interior first chamber (32) of sealing basically of housing upper area.

8. according to each described thermocutout of aforesaid right requirement, it is characterized in that:

Fixed contact (10,11), current collector (5), holddown spring (17) and disconnection spring (9) are located in interior second chamber (33) of sealing basically of housing central region.

9. according to claim 7 and 8 described thermocutouts, it is characterized in that:

Separate mutually by the director element (26) of the annular of establishing for transmitting element (15) first chamber (32) and second chamber (33).

10. according to each described thermocutout of aforesaid right requirement, it is characterized in that:

Sleeve (14) is attached to pot inboard of shape upper-part (40), and the opposing holddown spring (17) power and be pressed in the there.

11. each the described thermocutout according to claim is characterized in that:

Sleeve (14) is attached on the inboard (41) of end face (49) of housing upper-part (40) of pot shape.

12., it is characterized in that according to the described thermocutout of claim 11:

The end face (49) of the upper-part (40) of pot shape has the mold pressing part (50) towards housing inner chamber (6) of a dish type.

13. each the described thermocutout according to the aforesaid right requirement is characterized in that:

In the zone of lower housing portion part (24), be provided with a projection (45) that the downward staged of diameter of the housing is diminished, and the metal upper-part (40) of pot shape utilizes its lower limb to extend to this staged projection (45), and have a flanging (46) there.

14. each the described thermocutout according to the aforesaid right requirement is characterized in that:

Between the inboard (41) on the top (47) of insulated part (28) and pot shape metal top (40), a gap (48) is arranged at the assembling terminal location.

15. each the described thermocutout according to the aforesaid right requirement is characterized in that:

Current collector (5) is designed to be essentially circular slab, and if necessary, can be silver-plated on its one or both sides.

16., it is characterized in that according to the described thermocutout of claim 15:

Holddown spring is designed to have the star spring (18) of avris pin (19), and its avris pin (19) is the arch that protrudes in core (20) when the star spring unloads.

17., it is characterized in that according to the described thermocutout of claim 16:

The core (20) of star spring (18) is loaded by transmitting element (15), and the end (21) of avris pin (19) is supported on the current collector (5).

18. each the described thermocutout according to the aforesaid right requirement is characterized in that:

Holddown spring (17) is designed to the arch sheet element (22) of both sides projection when unloading.

19. each the described thermocutout according to the aforesaid right requirement is characterized in that:

Cut-out spring (9) is directed in housing groove (a 23) annular, that surround fixed contact (10,11).

20. the manufacture method with thermocutout of the described feature of claim 1, its feature can be summarized as following steps:

-the enclosure interior part of an insulation is set, at this inner part internal fixation and to have the connecting terminal that is located at distolateral fixed contact, wherein, the inner chamber of a column is arranged above this fixed contact, it with the form of an annular groove the side extend to fixed contact below;

-helical spring that a diameter the is fit to annular groove of packing into;

-the mobile contact that is garden shape basically of packing into, its overall diameter is slightly less than the interior diameter of cylindrical interior volume;

-the holddown spring of packing into, its overall diameter overall diameter with mobile contact basically is suitable;

The guiding parts of-the annular of packing into, its ring overall diameter is suitable with column vestibule interior diameter, and its ring interior diameter the diameter with a peg type transmitting element is suitable basically;

-transmitting element of peg type is connected same this transmitting element sleeve upper end, that fill up scolder that is inserted in insert annular guiding parts together;

-plug metal upper-part of pot shape and pressing total arrangement, until by the pressure that on sleeve and transmitting element, produces by pot shape upper-part holddown spring and current collector being forced together and entering closed position thus;

-especially the flanging of the feather edge by pot shape upper-part is fixed on the enclosure interior of insulation with pot shape upper-part.