DE19721159A1 - Thermally controlled electrical switch - Google Patents

Abstract

The switch (1) comprises a support (2) for a bimetallic strip (5), a contact spring (6) and a mount for a desired value adjustment device (10). The bimetallic strip has its fixed end (13) on the support and its swinging end (14) coupled to the activating end (15) of the spring via a translate (16). The bimetallic strip forms at least one, preferably two, U-shaped bends (19) along its longitudinal axis (17) towards its inner side (18). The U-bends arch (20) preferably points towards the spring.

Description

The invention relates to a thermally controlled electrical switching device, in particular a temperature controller with the other features of the waiter Concept of claim 1.

Such a thermally controlled switching device goes out, for example German Patent 37 35 334. In this state of the art is a columnar support member provided on which a bimetallic strip, a Switch contact spring and a holder drove a setpoint adjustment in the form of a rotatable spindle are attached. The bimetal strip is with its fixed end held on one side on the support element. It extends essentially in parallel to the switch contact spring and is with its swiveling end by means of a transmission tion element coupled to the actuating end of the switch contact spring. Swivels the swiveling end of the bimetal strip due to a temperature the actuating end of the switch contact spring is also pivoted, so that this can perform a snap switching movement, thereby a Movement and fixed contact can be moved relative to each other.

With the thermally controlled electrical switching device according to the state In technology, the bimetal strip is more protruding than the support element Stripes formed.  

As a further state of the art, it has already become known to have a U-shaped shape corrugated bimetallic strip to provide to bend the bimetal ver wrestle. The well-known bimetal in U shape is with reversed components provided and emerges from the brochure "métalimphy BERGHÜTTEN".

The invention further relates to a bimetallic strip, in particular for one Set used in a thermally controlled electrical switching device can be, in which the pivoting end of the bimetallic strip a switching Contact spring actuated thermally or indirectly or directly.

The invention has for its object a thermally controlled electrical switching device or an associated bimetal strip so on to form that the sensitivity or the switching behavior of the bimetal or the switching device is kept within narrow limits and the switching hysteresis is reduced.

This object is achieved by the characterizing part of patent claim 1. Advantageous developments of the invention result from the subclaims chen 2-6 or secondary claims 7-13.

The bimetallic strip is according to the invention in relation to its longitudinal extent direction in its interior, d. H. between its fastening end and its pivot end bent out in a U-shape. There must be at least one U-shaped Deflection is present, d. H. it can also be beneficial further bends may be provided. Due to the bends Switching hysteresis of such switches, which is usually 6-7 ° K 2.5-3 K reduced, which makes such switches completely new technical inputs  areas are opened. The increased sensitivity of the switching device tion or the bimetallic strip is based on the fact that the working volume of the Bimetal is increased in relation to its extension length. Within the for Available overall dimension of the bimetal will be more work volume men of the bimetal so that the overall response ver is improved.

Another advantage is that the bimetal strip due to the U-shaped Bending (s) can be made wider than in the prior art Flat stripe technique is possible. Flat stripes - they get wider trained - usually tend to cross-beam in the transverse direction bulge. This transverse curvature is active on the mobility of the bimetal Opposite end and hinders the deflection of the bimetal. As a result of the simple Chen or double waveform, which is considered the core of the invention, is now a dome-shaped transverse curvature of the bimetal strip prevents fens, so that the bimetal can respond more sensitive overall.

The at least one U-shaped bend of the bimetal that is in the thermal Controlled electrical switching device is installed with its U-arm point to the switch contact spring. This is advantageous in that then entire device in a known manner with its columnar Trä gerelement on a surface to be scanned with respect to its temperature can be screwed. The U-bends do not protrude downwards, so the Bimetal mobility is not hindered.

With two U-shaped projections protruding in the direction of the switch contact spring The intermediate, possibly U-shaped Mittelbe should lie between them rich are approximately in the main extension plane of the bimetal strip  the words of which are originally a flat bimetallic strip that is twice wavy bent upwards in the direction of the switch contact spring.

The invention is based on an embodiment in the drawing figures explained in more detail. These show:

Fig. 1 is a thermally controlled electric switching device with bimetal strip corrugated;

FIG. 2 shows a top view of the switching device according to FIG. 1.

The thermally controlled electrical switching device 1 has a Trägerele element 2 , which is constructed in a columnar manner and on an inner rivet element 3 carries insulating spacers 4 , between which parts of the carrier element 2 are held, namely a bimetallic strip 5 , a Schaltkon contact spring 6 with movement contact 7 , which acts on a fixed contact 8 as well as a holder 9 for a setpoint adjustment device 10 , which consists of a spindle 11 , into which an adjusting element 12 is screwed.

The fixed end 13 of the bimetal strip 5 is held on one side on the carrier element 2 and is coupled with its pivoting end 14 to the actuating end 15 of the switching contact spring by means of a transmission element 16 .

In the sectional drawing of FIG. 1 it can clearly be seen that the bime tall strips 5, based on its longitudinal direction 17 in its inner region 18, have two U-shaped bends 19 which point with their U-bends 20 to the switching contact spring 6 . The region 21 lying between these two U-shaped bends 19 lies approximately in the height of the main extension plane 22 of the bimetallic strip 5 shown in dashed lines.

These bends 19 increase the working volume of the bimetallic strip 5 in relation to its constant standoff length 23 from the carrier element 2 . Furthermore, there is a stiffening of the bimetallic strip 5 based on its width due to the U-shaped conditions 19 .

At its pivot end 14 , the bimetallic strip 5 is provided in a manner known per se with a bowl-like indentation 24 , into which the lower end of the transmission element 16 is inserted. The U-shaped conditions 19 are in the opposite direction, ie upward from the main extension plane 22 of the bimetallic strip 5 from the indentation 24 .

It can also be seen that the U-shaped bend 19 facing the fastening end 13 has a slot 25 in the region of the bimetal strip center.

From the top view of the thermally controlled electrical switching device 1 according to FIG. 2, it additionally emerges that from the carrier element 2 there protrude connecting contacts 26 which are conductively connected to the movement 7 and fixed contact 8 .

Reference list

1

thermally controlled electrical switching device

2nd

Carrier element

3rd

Rivet element

4th

Spacer

5

Bimetal strips

6

Switch contact

7

Movement contact

8th

Fixed contact

9

holder

10th

Setpoint adjustment

11

spindle

12th

Adjustment element

13

Fixed end

14

Swiveling end

15

Actuation end

16

Transmission element

17th

Longitudinal direction

18th

Indoor area

19th

Bends

20th

U-bend

21

Area

22

Main extension level

23

Stand-off length

24th

Indentation

25th

slot

26

Connection contact

Claims (11)

1. Thermally controlled electrical switching device ( 1 ), in particular in the form of a temperature controller, with a carrier element ( 2 ) on which a bimetallic strip ( 5 ), a switch contact spring ( 6 ) and a holder ( 9 ) for egg ne setpoint adjustment device ( 10 ) attached are, the bime tallstreifen ( 5 ) with its fixed end ( 13 ) is held on one side on the carrier element ( 2 ) and with its pivoting end ( 14 ) by means of a transmission element ( 16 ) coupled to the actuating end ( 15 ) of the switch contact spring ( 6 ), characterized in that the bimetallic strip ( 5 ) has at least one U-shaped bend ( 19 ) with respect to its longitudinal direction ( 17 ) in its inner region ( 18 ). 2. Thermal switching device according to claim 1, characterized in that the bimetallic strip ( 5 ) has at least two U-shaped bends ( 19 ). 3. Thermal switching device according to one of the preceding Ansprü surface, characterized in that the at least one U-shaped bend ( 19 ) with its U-bend ( 20 ) indicates the switching contact spring ( 6 ). 4. Thermal switching device according to one of the preceding Ansprü surface, characterized in that in two in the direction of the switching contact spring ( 6 ) projecting U-shaped bends ( 19 ) between them, optionally U-shaped region ( 21 ) approximately in the main extension plane ( 22 ) of the bime tall stripes ( 5 ). 5. Thermal switching device according to one of the preceding Ansprü surface, characterized by an increase in the working volume of the bimetal ( 5 ) based on its constant distance from the support element ( 2 ). 6. Thermal switching device according to one of the preceding Ansprü surface, characterized in that the bimetallic strip ( 5 ) is stiffened due to the at least one U-shaped bend ( 19 ) based on its width. 7. bimetallic strip ( 5 ), in particular for use in a thermal ge controlled switching device ( 1 ), in which the pivoting end ( 14 ) of the bimetallic strip ( 5 ) actuates a switching contact spring ( 6 ) directly or indirectly depending on the temperature, characterized in that the Bimetallic strip ( 5 ) between its fastening end ( 13 ) and its pivoting end ( 14 ) has at least one U-shaped bend ( 19 ) which increases its working volume with the same standing length ( 23 ). 8. Bimetallic strip according to claim 7, characterized in that between the fastening end ( 13 ) and the pivoting end ( 14 ) of the bimetallic strip ( 5 ) two U-shaped bends ( 19 ) are provided. 9. bimetallic strip according to one of claims 7 and 8, characterized in that both U-shaped bends ( 19 ) are bent in the same direction from the main plane of extension ( 22 ) of the bimetallic strip ( 5 ). 10. Bimetallic strip according to one of the preceding claims, characterized in that it has a bowl-like indentation ( 24 ) at its pivoting end ( 14 ) in a manner known per se, in which a transmission element ( 16 ) can be used and which has at least one U-shaped Bend ( 19 ) protrudes in the opposite direction from the main extension plane ( 22 ) of the bimetallic strip ( 5 ) like the indentation ( 24 ). 11. Bimetallic strip according to one of the preceding claims, characterized in that the U-shaped bend ( 19 ) facing the fastening end ( 13 ) is slotted in the region of the middle of the bimetallic strip.