DE7141802U - Device for displaying temperatures - Google Patents

Description

b «DBGM registration in D. G 71 41 802.5" Device for displaying temperatures "Note: Inter Control Hermann Köhler Elektrik GmbH & OaKG, Nbg.

Device for displaying temperatures

The innovation relates to a device for displaying at least one Temperature, in particular the cooling water temperature of motor vehicles, which essentially consists of a swiveling bimetal strip, which is in engagement with one or alternately with one movable mating contact that is also arranged in the housing.

Such devices have the disadvantage that the adjustment of the setpoint or its adjustment require a considerable amount of work. Not only must the two mating contacts with the pivot axis of the Bimetal are brought into alignment, but it must also be in a special device for the setting of each individual switching temperature Bath is immersed with the specific switching temperature and the contacts are set there.

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Verbal agreements since scfcrtftbchen confirmation Giro account Nutnferj 1 (2 40Q - (^ s ^ ^ re ^ nk Nuremberg 2,058,553

Such devices are extremely unsuitable for the automation of the adjustment process.

The task of the innovation is to provide a GeiJt to display To create at least one temperature, in particular the cooling water temperature of motor vehicles, at which these disadvantages are eliminated are urd which has the particular advantage that when one switching temperature is adjusted, the other switching temperature is adjusted at the same time.

To solve the problem according to the innovation, a device for Display of at least one temperature, in particular the cooling water temperature used by motor vehicles, consisting of a current-carrying bimetal strip, which is non-rotatable and pivotable in a housing is arranged at least approximately parallel to its longitudinal axis and depending on its temperature with or alternately with one movable mating contact, likewise arranged in the housing, is engaged, so that the distance between the bimetal and at least one mating contact for the purpose of changing the switching temperature is optionally variable and the bimetal controls the operating state of at least one electrical circuit, wherein after the previous

* hit the innovation of the or movable mating contacts as electrical conductive surfaces are formed.

Another proposal is to design the device so that the contacts of the bimetal and the adjustable countercocks are designed and arranged so that each time the one contact is set to a certain switching temperature, the other switching temperature can also be set automatically and simultaneously.

Particularly useful i.st this exemplary embodiment when after a «further proposal of the taxation for each setting the same switching temperature can be set.

Parts of rotary hollow bodies are expediently used as electrically conductive surfaces used, while the bimetal with its contacts in the cavity of the rotary hollow body parts and at a distance from their axis of symmetry is arranged, wherein the rotary hollow body parts are arranged rotatably together about an axis, which through the switching path of the bimetal and runs parallel to the axis of symmetry.

In a practical embodiment according to the innovation are electrically conductive surfaces partially cylindrical and have different diameters, while at the free end of the bimetal is arranged parallel to the switching path displaceable and lockable contact pin.

The radii of the partially cylindrical surfaces and the distance between their axis of symmetry of their rotation are so dimensioned that at all Positions of the switching path of the bimetal remains constant while the distance of the bimetal from the surfaces is variable.

But with the help of the innovation it is also possible to use part-cylindrical surfaces that have the same diameter and around a common central axis are rotatably arranged, the axis and contact edges of the bimetal in the plane of the switching path of the Bimetal and the contact edges are arranged to run at an acute angle to the axis of rotation, each of which alternates with one helical end edge of the part-cylindrical surface is in engagement, the slopes of the end edges of the electrically conductive surfaces, as well as the gradients of the contact edge, η of the bimetal are arranged and dimensioned in such a way that for all common positions of the electrically conductive surfaces the switchgear of the Bimetal constant, but the distance between the bimetal and a conductive surface! is changeable.

Essential advantages are) d> f, eKi * k ^r / that all forms of execution

T1 * n8u2 -9.3.72

the one for displaying a single or two switching temperatures can be produced and the same parts, namely in particular the Kontckte arranged on the bimetal and electrical conductive surfaces can be used

Incidentally, there is also a particular advantage in this regard when adjusting, because only a single device is required for both types of devices, namely those with one or two indicators », can be used without change.

According to the innovation, the device is particularly well suited for the automation of the adjustment process, because only one only rotary movement is required to set either only one switching temperature '.r or at the same time and automatically also two school temperatures to adjust.

Succession. : d d '^ Innovation based on execution example. ielen with Help ve h ^ matic drawings explained in more detail. Show it:

1 shows a known device for two switching temperatures,

2 shows a form of the innovation for zv / ei switching temperatures in longitudinal section _f

3 shows the exemplary embodiment according to FIG. 2 in cross section according to the ¹ line AR,

4 shows an exemplary embodiment of the innovation for the display of a single switching temperature in longitudinal section,

5 shows the embodiment according to FIG. 4 in section according to de. line C - D,

^F ".g. 6 a geometric" on.:bukf.on zur Darstelluno de- W; "rkungsw ^ i ._ .. j cKjs embodiment example..0 according to Fig. 2,

7 shows a geometric auxiliary construction for determining the curved surfaces,

8 shows a geometric auxiliary construction for determining the circular areas from the curved surfaces,

9 shows another geometric auxiliary construction for direct determination of the circular areas,

Fig. 10 is a view of a further Aus ■ Uhrungsbeispiels the innovation seen from the side,

11 the device according to the innovation according to FIG. 10 seen from above,

12 shows the device according to FIGS. 10 and 11 at different levels Settings.

The known embodiment of a temperature indicator according to FIG. 1 comprises screws 1 and 2, each of which is arranged in a particular electrically conductive tubular sleeve, and on a particular one Circuit mr'.t acoustic or visual display, for example a Warnl ^ pe 3 or 4 is, with 5 is the common ground connection of the two warning circuits, which is grounded to the lower part of the housing 30 and the electrically conductive Base 6, which is arranged in the housing 30, is connected in an electrically conductive manner is. The electrically conductive bimetal 7 is fastened in the base 6, the upper end of which can be pivoted in the letters and Orn the free upper end has a Hc'cen 8, ait for movement seal of screws 1 and 2 inclined surfaces 45 and 46. The hook

8 becomes under the influence of temperature changes of the bimetal moved back and forth between screws 1 and 2, then once the lamp 3 and unicycle the lamp 4 lights up. The upper pedestal

9 is made of insulating material.

The disadvantages of these known devices are as follows.

In the manufacture of the device according to FIG the two screws 1 and 2 in alignment with the pivot plane of the Bi-Mietallstreifens brewed iw ^ rJao ^ what expedient by twisting

n ^! ' iUZ-9.3.72

at least one of the bases 6 or 9 takes place against one another.

Changing the switching temperature, also known as "setting the setpoint", is done by moving the screws 1, 2 by means of their threads in their longitudinal direction. Done in the same way also the adjustment of the target value, which becomes necessary if during production due to any unintentional influences, How manufacturing or assembly tolerances do not reach or exceed the specified target value. That happens in particular when adjusting after immersing the device in a bath with the setpoint temperature to be set. Then the device according to FIG. 1 to set the other limit value temperature in another bath with this temperature. Must be after setting The base and screws must be secured against twisting.

The setting must be made particularly precisely because the customers atw The lower switching point of e.g. 40 C only has a tolerance of -5 C and the upper switching point of e.g. 115 C only a tolerance of -3 C. allow.

The major drawbacks of these devices are the high time required Adjusting or changing the setpoint temperature, as well as the imprecise Einstallmöglicrikeit, which causes high reject rates, and the state that both temperatures must be set one after the other.

In contrast to this, according to the innovation (Fig. 2 and 3) from a housing 19 with an external thread 20. It is in the Drawing above an electrically insulating connector 21 (Fig. 2) or 1? 1 (Fig. 4) to the housing un the longitudinal axis 37 rotatably and lockably arranged. The housing 19 has a cavity 22 in which partially cylindrical contact surfaces 23 and 24 engage (see also Fig. 4). Each contact surface has an upwardly leading out Connector 25 and 26 or, only 25 to which, similar to the well-known execution / ulg ^ äÄ £ p2ei9p8qh7iig. 1 two different or

only one warning circuit is connected.

In the space 27 between the contact surfaces 23 and 24, a bimetallic strip 28 is pivotable parallel to the plane of the drawing and is arranged non-rotatably in the base, which in turn sits non-rotatably in the housing 19. The base 29 is expediently made of electrically conductive material and is also connected in an electrically conductive manner to the inner wall of the housing 19, so that a special line between bimetal 28 and ground is superfluous.

At the upper end of the bimetal strip 28 (Fig. 2 and 3), a switching pin 32 is arranged, the contact surfaces 34 and at its free ends 35, which according to the temperature state of the bimetal strip 28 either with the contact surface 23 or the contact surface 24 are engaged, whereby the warning circuits are switched off or on.

In the practical exemplary embodiments according to FIGS. 2 to 5 it is the connecting piece together with the part-cylindrical surfaces 23 and 24 of different diameters rotatable about axis 37 in the plane of FIGS. 3 and 5, respectively. The axis of rotation 37 lies on the switching path of the Bimetal 28.

38 is the central axis of the part-cylindrical surface 23 and 39 is the central axis of the part-cylinder 24. Instead of the two central axes 38 and 39, there is the common shuttling axis 179 and if you consider that the representation according to FIG. 3 is about 10 times as large as in nature It can be seen that the slight difference in position of the axes 38 and 39 can only have a very slight influence on the accuracy of the display. In fact, this slight inaccuracy does not exceed the usual tolerance range,

All dimensions are chosen so that in every position of the electrically conductive "surface") 23 * and 24 between these

M4 78 UZ -9.3.72

pin 32 the same path is covered, while the change in position changes the path from the bimetal to a single half-shell.

In the exemplary embodiment according to FIGS. 2 and 3, the length of the Scholtstiftes 32, as well as the arrangement and design of the surface 23 designed and arranged for switching the temperature 40 C and the surface 24 for switching at the temperature 115 C.

In Figs. 4 and 5, a similar exemplary embodiment is shown as the known device of Figs. 2 and 3, namely, a temperature indicator with only a single threshold. It is basically constructed in exactly the same way as the device according to FIGS. 2 and 3. Identical parts are denoted by the same reference numerals. The only difference from the first exemplary embodiment according to the innovation is that in the exemplary embodiment according to FIGS. 4 and 5, the contact surface 24 and the connection 26 with its corresponding second warning circuit are omitted.

In Fig. 6, the geometric relationships of the device according to the innovation are shown schematically for the purpose of clarification. The solid lines correspond to the illustration of FIG. 3 and the reference symbols have also been taken from there. So again 23 and 24 mean the half-shells, of which only the inner contact surfaces are shown, while 32 denotes the switching pin and 37 the center of rotation around which the half-shells 23, 24 are rotated, the bimetal 28 with the switching pin 32 being stationary but pivotable stays.

With dashed lines are the 37 jointly rotatable contact tracks 23 'and 24 ", and you can see +. That higher switching values apply if the deflection of the bimetal 28 occurs to the right in the drawing when the temperature increases.

The geometrical condition for the function and the simple adjustment The device is, as already stated above, that the routes A-B, namely the switching path d .5 switching pin 32 in all Positions around point 37 remain the same as route G-D.

For the purpose of adjustment, however, it must still be possible to change the section A - 37 during rotation. This also follows from. Fig. 6, because the distance 37 - C is greater than the distance 37 - A. If you lay out the device so that the setpoint is between points A and E, you can turn it as described in the Correct deviations from the nominal value that arise during assembly by selecting the direction of rotation in one direction or the other.

How, on the basis of exact mathematical-geometric considerations, to Formation of the half-shells and their mutual assignment to one another and to the bimetal is explained below.

This is based on an Archimedean spiral constructed in a known manner, as shown in FIG. 7, and is based on the individual points of the spiral 1 * to 8 "on a ray that between the origin of the spiral and one of its points, e.g. 8 ', runs an equal distance on both sides and comes up this way to points t and S etc.

ο ο

The down through these points curves have the property that the distances of the curve points t _o the origin clockwise

0-0

The opposite direction always becomes larger, while the distances between the opposite points S η in the same direction of rotation become smaller, but the distances between the beam points t _g and S _g , or e.g. t and S, etc., remain constant.

If, therefore, one places the fulcrum of the display device, the half-shells arranged by means of this curve, in the

Origin of the Archimedean spiral and at the same time on the switching path of the bimetal, it is possible to adjust or change the setpoint as well as the constant switching path at the same time guaranteed for the bimetal.

Since the curve shapes determined in this way are not identical to a circular shape and therefore difficulties arise during manufacture, the curve sections are replaced by circle segments during manufacture. The following geometrical ones are known per se Construction used.

As shown in Fig. 8, the centers M and M of the two circles become determined in such a way that different points of the curve are connected to one another by chords, for example JL - B_ - C- etc., on which the perpendicular perpendiculars are established. The intersection of these The center perpendicular is then assumed to be the center of the circle, so that As can also be seen from FIG. 8, there is only a very slight difference to the mathematically exact curve shape is. In FIG. 8, the exact, mathematical course is indicated by points on the rays, while the solid curve represents the segments of a circle.

When constructing a device, in particular the part-cylindrical contact surfaces, the practical procedure is as follows. One sees a distance of the length of the switching path plus the length of the switching pin 32 attached to the bimetal 28 and halves the distance, the center of which serves as the origin of an Archimedean spiral, the gradient of which, ie, the increase in radius per degree, corresponds to the desired change in setpoint per degree. In addition to the first line, further lines running through the origin are placed on top of this, the end points of which are at the same distance in each direction from the point of intersection with the spiral. Then, as described above, the arcs are determined and the design of the device eA ^ JB ^^ ffVl ⁶¹¹ circle segments are selected and the

Bimetal sensor installed in such a way that its switching path goes through the origin De-Archimedean spiral runs. Passes through this origin also the axis of rotation for the common rotation of the contact surfaces perpendicular to the plane of the drawing in FIG. 8.

But you can also use another geometric construction achieve the same operating conditions (Fig. 9). First, two concentric semicircles 53 and are drawn around the center point 52 54, which represent the electrically conductive surfaces for which it is true that in the range of 180 on a ray through the center point 52 the distances between the various concentric circles are constant. This results from the condition concentric.

Such a device would set the same switching differential for all switching positions, but not the setting allow different switching temperatures. One therefore needs again As in the previous exemplary embodiment, an eccentric pivot point lying to the half-shells, which is mounted on the switching path of the bimetal is, while when adjusting the half-shells together around this point to be turned around. For this pivot point, the condition that the switching travel is constant in all switching positions also applies, that but when rotating the lengths of the lines between the center and the half-shell are changed in such a way that they are at a specific direction of rotation either increase or decrease, so that deviations can be made when designing the construction, starting from a nominal value can adjust up and down from this.

The geometric 0.:t for such eccentric points is obviously a Circle around the center point 52. Its radius is found by halving the distance C-H on the horizontal axis 55 according to FIG and thereby gets the center point 56. If one strikes around the center point 52, which applies to the two concentric circles 53 and 54, one Circle with the radius 52 - 56, you have the geometrical location you are looking for.

Now, as is also shown in Fig. 9, the device can be designed in such a way that that the lower setpoint is reached, for example, at point 57, i.e. in the area of the sector at the top left in FIG. 9, with, for example, 40 C. Then at a limit value difference of 75 C on the other side, namely on the half-shell 54, the Switching point 115 C reached. If you now rotate the half-shells 53 and around the point 58, the sector 58-57 becomes smaller, while it is at Rotation in the opposite direction becomes greater. The opposite is the case on the half-shell 54.

The clockwise rotation of the half-shells thus causes the lowering the switching points, while the reverse rotation causes the switching points to be raised.

Based on the device is in this construction the Gesamtdurchinesser of the two concentric circles equal to the length of Schalxweg plus Kc. (Lan ^ ₁ The common pivot point of the Haibscnalen 58, närnli <is a point on the locus and the switching path adf eii ^ m common diameter of the two concentric circles.

The embodiment according to FIGS. 10-14 has two partially cylindrical Contact surfaces 151 and 152, which are common about the axis 157 Drehb r are arranged (Fig. 10 and 11). The ones below in the drawings End faces 178 and 153 are helically wound, as shown in particular in FIGS. 10 and 12-14 schematically. The pitch of the screw threads of both cylinders is arranged in opposite directions.

In which by the Teilzyl .- 'nc. The hollow space 159 formed in 151 and 152 is arranged on the B 'v.etzll 154, with a trapezoidal square 153 connected, the switching path of which runs parallel to the drawing plane in all figures. The side surfaces K2 and "\ 6ό ve run at an acute angle I8O7 ^ f-ffc ^ J ^ 7

Dos Trapez 153 is arranged so that the larger base in Area of the free end face of the partial cylinder is arranged. By touching the end face 178 with the side face 162 of the trapezoid 153 an electrical warning circuit is closed. One only uses a partial cylinder, e.g. 151, this embodiment corresponds to the example according to FIG. 4. But the second partial cylinder 152 is also is used, η ch is the corresponding deflection of the bimetallic strip 154 in FIG. 10 after reciits and touching the front edge 158 with the side edge 163 of the trapezoid closed in another warning circle.

In FIGS. 12-14, different positions of the partial cylinders are shown and thus also the setting for different switching temperatures. FIG. 12 shows, for example, a setting of 40 ° C. switching temperature and 115 ° C. maximum temperature and the contact edge 162 rests on partial cylinder 151. The remaining switching path of the bimetal 154 or of the contact trapezoid is denoted by the reference numeral 150 153 designated. The same applies to these devices that the entire Switching travel and thus also the switching temperature difference is the same for all settings.

In Fig. 13 the device is set to lower switching temperatures shown in Fig. 14 to higher switching temperatures. This is actually the arcuate deflection of the bi-metal for simplicity as a parallel offset from the center line 157

drawn.

In response to this l'aise, the setpoint values can either be adjusted or adjusted in the same way. Both measures are easily accessible by automation , in particular because

j v / eil a simple rotary movement for simultaneous adjustment

both temperatures SKf is sufficient.

T41802 -9.3. 72

How easy it is to adjust or change the setpoint of the device after the innovation by this measure is shown below shown.

After assembling the device, the connection piece 21 is rotated so that that the contact surface 35 of the Schaltstiftös 32 as far as possible from the Contact track 24 is removed. Then the device is placed in a bath for a setpoint with a temperature of e.g. 115 C. The bimetal now adjusts to this temperature and assumes the deflection corresponding to this value, at which the contact 35 and the contact surface 24 should close,? Now you turn the connecting pipe 21 so long until the circuit is just closed. Of course, you can also start from touching both contacts and turn the contact surfaces until the circuit is just opened at the higher limit temperature. Because now the path of the switch pin 32 is constant between the two half-shells in all positions this adjustment also achieves the very important advantage that the switching point is always on the other half-shell is adjusted by the same switching temperature difference. The size of this constant temjjeratijr difference is a question of design of the device. It can be adjusted in a simple manner if the control pin 32 is replaced by another one of different length. The same is also possible on the other side with the low limit.

All features shown in the drawings and in the text and their combinations are essential to the innovation.

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Claims (9)

Nuremberg, November 22, 1971 Bu / Rei Re: DBGM registration in D. G 71 41 802.5 "Device for displaying temperatures" Note: Inter Control Hermann Koehler Elektrik GmbH & Co KG, 85 Nbg. S c h_u t z_a n_s |> _ £ _ü c h e 1. Device for displaying at least one temperature, in particular the KUhlwuäsertemperatur of motor vehicles, consisting of a current-carrying bimetallic strip, which is rotatably and pivotably arranged in a housing at least approximately parallel to its longitudinal axis and depending on its temperature with one or alternately with one each likewise arranged in the housing movable Geyankontakt is engaged, so that the distance between the bimetal and at least oinem counter-contact for the purpose of C ~ change the switching temperature, is selectively changeable and the Binetall the operating state of at least eteuert an electrical circuit, characterized in that the movable counter-contacts ( 23) or (23 and 24) or (151 and 152) are designed as electrically conductive surfaces. 2. Device in particular lach claim 1, for displaying two Temperatures, characterized in that the contacts of the bimetal (28) or (154) and the pairs arranged electrically conductive surfaces (23 and 24) or (151 and 152) such are designed and arranged that at each setting to a certain temperature simultaneously and automatically the other switching temperature can also be set. -9.3. 3. Device in particular according to claim 2, characterized by such a dimensioning and arrangement of the electrically conductive surfaces (23) and (24) or (151) and (152) relative to the bimetal (28) or (154) that the same for each setting Switching temperature difference is present. 4. Device in particular according to claims 1-3, characterized in that the electrically conductive surfaces are designed as parts of Rotationshbhlkkörern, while the bimetal (28) with its contacts in the cavity (27) of the rotary hollow body parts and at a distance from their axis of symmetry (179) is arranged, wherein the rotating body parts are arranged rotatably about an axis (37) which is through ' the switching mechanism of the bimetal (28) and runs parallel to the axis of symmetry (179) » 5. Device according to at least one of claims 1-4, characterized characterized in that the electrically conductive surfaces (23) and (24) are partially cylindrical and have different diameters and that at the free end of the bimetal (28) ^ is arranged in parallel to its switching path displaceable and lockable contact pin (32). 6. Device according to at least one of claims 1-5, characterized characterized in that the radii of the part-cylindrical surfaces (23) and (24) and the distance between their axis of symmetry (179) of their axis of rotation (37) are dimensioned such that the switching path of the bimetal is constant in all positions, during the Distance of the bimetal from the surfaces is different in different positions. 7. Device according to claims 1-4, characterized in that that the electrically conductive surfaces are partially cylindrical surfaces (151) and (152) are of the same diameter and are arranged to be rotatable about a common axis (157), the axis (157) and contact edges (162) and (163) of the bimetal (154) in the plane of the switching path of the bimetal (154) and the contact edges at an acute angle (180) to the axis (157) are arranged, each of which optionally with a helical end edge (178) or (158) of the part-cylindrical Surfaces (151) and (152) are in engagement, the slopes the front edges of the electrically conductive surfaces, as well as the slopes of the contact edges of the bimetal so arranged and are dimensioned so that the switching path of the bimetal constant, the distance, for all positions of the electrically conductive surfaces however, it is variable between a contact edge of the bimetal and an end edge of a part-cylindrical surface. 8. Apparatus according to claim 7, characterized in that the Screw threads (178) and (158) have the same and opposite slopes and that the angles (180) of the contact wires (162) and (163) are the same size and are arranged symmetrically to the axis of rotation (157). 9. The device according to at least one of claims 1-8, characterized by a motor for the purpose of adjusting the Setpoint or its steepening is temporarily engaged with the rotatable electrically conductive surfaces. Oo device according to at least one of claims 1-9, characterized by a single electrically conductive surface (23) or (24). 1. Device according to at least one of claims 1-9, characterized by a single electrically conductive surface (151 ) or (152) and a contact edge (162) or (163).