FI62426B - EFFEKTREGLERINGSANORDNING - Google Patents

Description

RÄ ^ l rBl m) ICUULUTU $ PUBLICATION /; 0/1 O £ utlAgg NI NOSSKRI FT 6242 6 C Patent rayJnrotty 10 12 1922 (45) Patent oed:! E-lat ^ T ^ (S1) K ».ik? /Int.a.3 G 05 F 1/66 FINLAND-FINLAND (M) PtMnttlhakMHN - PatMitmeknlng 7717 ^ 9 (22) Haktmlspttvf - Araeknlngidag 01.06.77 (23) AlkupUvt — Glklghatsdag 01.06.77 (41) Tullut JulklMkil - BIMt offancHg 10.12.77

PatmttP and the Registry Board ... ________ ._. . .....

V (44) Date of issue of the initial entry. -

Patent- and register-registration 'aimMom utiagd odi uti ^ kriftM pubimnd 31.08.82 (32) (33) (31) Prr * «tty« omIIcms — fagird prtorttst 09.06.76

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2625716.9 (71) E.G.0. Regeltechnik GmbH, 7519 Oberderdingen, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Karl Fischer, Oberderdingen, Robert Kicherer, Knittlingen,

Federal Republic of Germany-Förbundsrepubliken lyskland (DE) (7I +) Oy Kolster Ab (5U) Power control unit - Effektregleringsanordning

The invention relates to a power control device for controllably supplying electrical power in the form of power pulses to a consumption object, which device has a rotatably mounted bimetallic member depending on the coupled power, which acts on the quick coupling via a lever at an angle, and has a control curve and equalization metal.

Such a power control device has become known from "Conti-Elektro-Berlichte", October / December 1959, pages 285-290, in particular Fig. 3. This power control device has a bimetal with a right-angle compensating metal. In the area of the inner corner, this bimetallic metal is pivotally mounted on a pin fitted to the clutch body. The compensating metal acts on the encapsulated switch. The adjustment is effected by means of a control curve which acts on the free end of the working metal by means of a roller and a separately mounted lever and an adjusting screw. Opposite the bimetal is a mechanical coupling with two contact springs.

In structural power control, the bimetallic can, for structural reasons, have a length that is not much larger than half the size of the switch 2 6 0 4 2 6. Correspondingly, its thickness and operating distance are then smaller. Furthermore, the temperature of the bimetal immediately shifts to the compensating bimetal attached to it, so that this always operates in a relatively high temperature range and its actual function, taking into account the effects of ambient temperature, can only be solved by imperfect. Adjusting the work area by turning the working bimetal using the lever mechanism is complex and results in inaccurate reproducibility of individual sub-powers. This reproducibility is poor, especially in the critical high and low power ranges. For example, the 5% partial power required to heat on an electric hob cannot be reliably adjusted with such a device.

Furthermore, such power control devices with a rotary quick-release switch are known, for example, from German patent publication 1 640 084. In these, the working metal is immediately connected to the latch spring and the adjustment takes place via a cam plate and a lever with a stop, the distance of which to the working metal becomes set during the adjustment. This system allows only relatively thin and labile bimetals and causes difficulties in achieving leveling (not present in the print product).

The object of the invention is to provide a power control device which is simple to manufacture with a low construction height and which, despite the relatively low requirements for the accuracy of the construction, enables very good reproducibility of the power controls. In particular, the ambient temperature equalization must be solved reliably.

According to the invention, the task is solved in that the quick coupling is pivotally mounted as a unit together with a clutch bracket and unilaterally and substantially parallel to the quick coupling with a compensating metal attached to the clutch bracket, the control curve acting on the free end of the compensating metal the second bimetallic member is independently pivotable from the pivoting quick coupling / compensating bimetallic unit.

Thus, a unit of equalizing metal / quick coupler is formed, which as a whole is rotatable. The compensating metal is only very slightly affected by the temperature of the working metal and is therefore suitable for its compensating function. It is not only protected against heat but also by a quick-acting switch located parallel to it. It can be short and relatively powerful. In contrast, the working metal always remains in its position and only turns its heating 3 62426 correspondingly to its other end towards the quick coupling.

Preferably, the bimetallic member is then L-shaped, in which case the longer bimetallic branch is provided with a heating device and possibly supported by a spring-loaded adjusting screw in the housing.

According to a further feature of the invention, the alternating current device has a diode which is connected via a switch driven by the control shaft only in the high power range of the bimetallic heating device and which is disconnected in the low power range.

The device can thus have a bimetallic heating device which is relatively large and therefore also easier to control by means of the wire thickness. In the low power range, this heating works fully, so that rapid heating of the bimetal occurs, resulting in a rapid loss of total power. The low relative switching resistance thus obtained also keeps the heating of the switch limited, because the bimetallic control heating device is also connected only during the connection of the consumption object. In the high power range, on the other hand, which can start, for example, when the relative switching duration is 20%, the diode of the bimetallic heating device switches on. Thus, the bimetallic heater receives only half the alternating current and thus only half the power. Correspondingly, heat generation is lower and higher powers are more easily adjustable. Heat generation in this range would be highly undesirable because the coupling resistance in this range is also high for a bimetallic heater. Furthermore, the temperatures in the bimetal are kept low and the total heating of the switch remains low, so that the ambient temperature equalization can also be carried out advantageously.

It is particularly advantageous that the diode is arranged on the rear side remote from the operating side of the housing of the power control device to the switch immediately bypassing it. Such an embodiment keeps the diode fitting and switching costs very low and the diode is arranged in a cool outer area of the switch. The switching switch of the diode can be a simple "creep" working switch that does not need a jump mechanism on the control shaft.

Other advantages and features of the invention will become apparent from the subclaims and the accompanying description. An embodiment of the invention is in the drawing and will be explained in more detail below.

, 62426

Fig. 1 shows an embodiment of a power control device according to the invention in a plan view, seen from the operating side, with the closing cover removed.

Figure 2 is a section along the line II-II in Figure 1.

Fig. 3 shows a rear view of the power control device in Fig. 2 seen from the left.

Fig. 4 is a circuit diagram of the power control device according to Figs. 1-3.

Figures 1-3 show an embodiment of the power control device 11. It has a plastic housing part 12, which is remote from the operating side, i.e. a rear housing, which is rectangular or preferably square and has an inner notch 25. This notch is closed by a plate-shaped cover 13 with centering pins 17 placed on the side of use. engage the centering notches 16 in the housing part 12. A threaded sleeve 14 is attached to the cover 13 through which a setting shaft 15 protrudes supporting the setting knob 60 shown in Fig. 4. The setting shaft 15 protrudes into the central hole 23 of the guide piece 18, which is insulating and has a guide curve 19 and a guide curve. 20. At the end remote from the operating side of the guide piece 18 there is a bearing pin 21 projecting through the opening 24 of the rear housing part 12 and having a second engaging cam 22 on the rear side of the housing part 12.

In cooperation with the control curve 19 there is a compensating metal 26 in the form of a transfer lever, which is pressed against the control curve 19 at its front bent end by means of a spring 34. The relatively thick and rigid compensating metal is pivotally mounted at its end, by which it does not rest against the guide curve 19, by means of a pivot shaft 28. From this end, the compensating metal is connected to the coupling bracket 29 of the quick coupler 27 so that the compensating metal runs parallel to the coupling bracket 29 at a small distance therefrom. The quick coupler / compensating metal unit is thus pivotally rotatable about the shaft 28.

A clutch spring is arranged on the clutch bracket 29, which rests on a support bearing with a spring tongue bent under normal tension and subjected to buckling stress. At its free end, the latch spring supports a contact 31 which cooperates with a fixed counter contact 32 and which is fastened at its opposite end by means of an adjusting screw 33 having a circumferential groove into which the fork-shaped end of the latch spring is inserted. By welding the connection end leading to the electrical input line 35, the latch spring is connected to the output of the application 70 and to the input 68, respectively.

The quick coupler 27 drives to the bimetallic 36, which is L-shaped. This L is made entirely of bimetal and a shaft 37 is fixed to the inner corner of the L, which, like the shaft 28, is preferably fixed so that in each case the housing part 12 and the cover 13 have notches which, when the two housing parts are connected, receive shafts.

The long, heated branch 38 of the bimetallic member 36 supports a heating device 39 having a heating coil or heating coil and supplied with current through two input lines. An adjusting screw 40 is screwed to the free end of the heated leg 38, which is pressed by a spring 41 against the inner partition 42 of the housing 12.

At the end of the short leg 43 of the bimetal member 36 is a bend 44 which presses the latch spring 30 against the guide point.

The heated branch 38 of the bimetallic member 36 is partially enclosed by the partition 42 in a space 71 ventilated by ventilation slots 45.

It should be noted that the unit is a quick coupler / equalizer on the other hand and a bimetallic member. 36 on the other hand are angularly arranged and enclose a guide piece 18. A mechanical switch with a clutch slider 50 operated by a coupling cam 20 is arranged in the corner opposite this angle of the notch 25. This plastic clutch slider has the shape of a rectangular rod rounded for co-operation with and the other end side of which is acted upon by a compression spring 54. The clutch slider 50 runs approximately obliquely so that it can have the largest possible length when the space requirement is very small.

The upper and lower surfaces of the clutch slider have protrusions 51 which form support bearings for the contact arms 52, 53 which are pushed onto the clutch slider and project over it on both sides. The clutch slide 50 is preferably an insulating part so that the contact arms can be pushed on and locked in place by clicking. Each contact arm has one contact at each end.

The clutch slide 50 is guided by guides 55 having the shape of metal plates projecting transversely of the clutch slide from the bottom of the housing part 12. The device has four guides 55, of which always two opposite ones control the switch slide and partially engage it. These guides 55 support partially fixed contacts 56 and protrude through the bottom of the housing part 12 and form connecting lugs on the rear side, similar to AMP plug lugs.

Figure 3 shows the rear side of the power control device 11.

It can be seen that the switching cam 22 cooperates with a very small and lightweight switch 61 having the shape of a contact spring and made to short-circuit the diode 62. In this case, the diode with its connections 63, 6 * 4 is soldered directly to the corresponding connection contact or contact spring, and the contact spring makes a bend after the connection 63 and can short-circuit the diode 62 by touching its connection. 64.

The power control device works as follows;

Figure 1 shows a disconnected state in which the coupling cam 20 has pushed the clutch slider 50 back against the force of the compression spring 54 and thus lifted the contact arm 52 for signal contact and the contact arm 53 for disconnecting the second terminal from the respective fixed contacts.

In this position of the guide piece 18 and the setting shaft, respectively, there is a compensating metal 26 in the recess of the guide curve 19, so that locking results.

When the energy regulator is engaged (rotating the control member 18 clockwise), the engagement cam 20 is first released by a control slider 50 which, under the force of the spring 54, rests at least partially with its resilient contact arms 52, 53 so as to engage the guides 55. Thus, on the one hand, the signal contact line 66, 67 is closed and, on the other hand, the other terminal of the heating device 70, e.g. the heating plate of the electric hob, is connected.

As a result of the spring 34, the unit turns the compensating metal / quick coupling to the position corresponding to the respective position of the control curve 19. The contacts 31 and 32 are closed so that the bimetallic member 36 is heated by its heating device 39. The switch 61 is closed in the low power range, e.g. with the setting shaft in a position corresponding to power values of 5-20% of the total power. Thus, the diode 62 is bypassed at the low set power, so that the full heating power of the heating device 39 is in operation.

7 62426

Therefore, the branch 38 of the bimetallic member bends relatively quickly and, via the short branch 43 and the bending 44, presses the quick switch in its opening direction, so that after a relatively short time it opens again.

After the bimetallic member has cooled down, the quick switch 27 engages again and the operation begins again. In the upper working area, on the one hand, the unit of compensating metal / quick-release switch is more strongly turned counterclockwise and, on the other hand, the diode is operational due to the opening of switch 61. The heating device 39 is thus operated only in each case with a half current of the alternating current, i.e. with half the heating power. The bimetallic member must therefore be considerably longer and turned so far that it can open the quick coupling and thus cut off the power supply to the consumption point 70. In the case of relatively high temperatures, the bimetal also cools faster, so that a higher relative switching resistance is guaranteed.

The power control device according to the invention has numerous advantages.

Despite its clear and reliable structure, it can be manufactured at a relatively low cost and operates with relatively high coupling distances and forces. In particular, large forces are essential. They are achieved with a somewhat strong himetallic content. Preferably, due to the structure, the working metal may be approximately long and the compensating metal may be approximately short and strong. The springs 34, 41 move the whole system to a certain space by force, so that there is only one point in the device where a clearance can occur, namely the point of contact between the latch spring 30 and the bending 44 of the bimetal 36.

Formulation of the bimetallic member 36 into an L-shaped member of the bimetallic material has a further advantage. Normally, it is very difficult to align such a control member with a compensating bimetal because both bimetals operate at different temperatures. However, the bending distance of the bimetal per unit temperature decreases as the temperature rises, so that the compensation can be precisely determined for only one working range at a time. However, the bimetallic member described here has so-called double heating. The short leg 43 runs at a relatively small distance parallel to the latch spring 30. This is supplied with current through the input line 35 and is relatively thin. It therefore also heats to a certain extent as the 62426 8 current passes through it. This heat further heats the short branch 43, however, significantly only at higher powers, because otherwise the latch spring will hardly heat above room temperature. Thus, however, the negative effect of the deflection paths, which shorten with temperature, is compensated for, i.e., this negative phenomenon is counteracted.

In addition, the compensating metal is protected as far as possible against temperature. It is perpendicular to the working metal and has no conductive connection with it. By means of the partition 42 it is also protected from a very hot space. It is protected against the temperature caused by the latch spring by means of a clutch bracket 29.

This arrangement thus ensures that the compensating metal can perform what it is intended to do, namely perform equalization of different ambient temperatures and does not have to operate at a temperature substantially elevated relative to the environment.

The working metal and the unit compensating metal / quick coupler use two sides of the switch housing so that one corner is left completely free for the switch 50-56. Fitting this very small switch in the same radial plane as the other parts of the power control device makes it possible to make this device very low in construction. The depth in the direction of the adjustment axis can be, for example, less than 25 mm, so that the use of a vertical axis is also possible in very flat cooking recesses.

Diode 62 has a rather positive effect on the operation of the power control device. The central power range rarely causes difficulties in such control devices. The real difficulty is in the high and above all low power range. In current relatively high power hobs, the low power range is critical when you also want to heat the hob. It must be powered up to 5% of the total power and below it secured (100 W for a 2000 W hob). However, this requires very high powers in the bimetal, as this must react quite quickly. But these high powers in the higher power ranges not only heat the device very strongly and need energy, but they also unauthorized raise the temperatures of the bimetal. By down-adjusting the heating power of the bimetal, preferably without waste heat, by means of a 9 62426 diode, this problem can be solved simply. The high power for which the bimetallic heating device is intended is not a disadvantage, since this is generally used only with the lower active substance and the relative switching times are very small there. Thus, the heating of the control device via the heating device 39 is very small. Conversely, the diode limits the power in the high power range so that there, in the case of relatively long switching times, the heating of the switch is likewise limited. An additional advantage is the fact that the heating device 39 can be made simple. If a lower power is desired, this would cause difficulties, because the resistive wires for lower powers at the mains voltage and especially in the case of higher mains voltages would become quite thin, which would also affect operational safety.

Claims (17)

A power control device for controlling the supply of electrical power in the form of impulses to a consumption object, the device having a heated, pivotally mounted bime member which, depending on the connected power, acts on a quick switch via a lever at an angle thereto, and a control curve and a compensating metal, characterized by is pivotally mounted as a unit together with a clutch bracket (29) and unilaterally and substantially parallel to the quick coupling (27) with a compensating metal (26) attached to the clutch bracket (27), the control curve (19) acting on the free end of the compensating metal (26) when the substantially L-shaped bimetallic member (36) is independently pivotable from the pivoting quick coupler / compensating bimetal unit. Device according to Claim 1, characterized in that the longer branch (38) of the L-shaped bimetallic element (36) is provided with a heating device (39) and optionally supported by an adjusting screw (40) under the spring force (41) in the housing (12). Device according to Claim 2, characterized in that the shorter bimetallic branch (43) runs parallel to the latch spring (30) of the quick coupling (27), through which current is applied (35) to the coupling contact (31). Device according to one of the preceding claims, characterized in that the heating device (39) of the bimetal (36) is connected in parallel with the consumption object (70). Device according to one of the preceding claims, characterized in that the locking spring (30) is adjusted by means of a screw (33) forming a support remote from the contact end of the locking spring (30), which guides the locking spring (30) into the notch. Device according to one of Claims 2 to 5, characterized in that the heated bimetallic branch (38) is located at least partially in a heat-protected, optionally ventilated space (71) relative to the compensating bimetal (26) and the quick coupling (27). 11 674 2 6 Device according to one of the preceding claims, characterized in that the pivot shafts (28, 37) of the quick coupling (27) and the bimetallic element (36) are mounted at their ends on the housing parts (12, 13) to be connected. Device according to Claim 7, characterized in that the second housing part (12) has a notch (25) for receiving the main parts of the control device, which second closure part (13) closes in the same way as the cover. Device according to one of the preceding claims, characterized in that a mechanical switch (50-56) is arranged in the same plane transverse to the control axis as the quick coupling (27) and the bimetal (36) for disconnection from the mains and / or signal contact. Device according to Claim 9, characterized in that the coupling has a clutch slide (50) driven by a cam (20) connected to the control curve (19) and having transverse contact arms (52, 53). 10 62426 Device according to Claim 10, characterized in that the clutch slide (50) is located obliquely in one corner of a rectangular, preferably square, housing (12, 13). Device according to Claim 10 or 11, characterized in that a switch slide (50) of insulating material is inserted between at least four transversely opposite metal guides (55) which are located in pairs opposite one another and support or form fixed contacts (56), and protrude through the clutch housing (12) to form connecting lugs (57). Device for use with alternating current according to one of the preceding claims, characterized by a diode (62) which is connected via a switch (61) driven by the setting shaft only in the high power range of the bimetallic heating device (39) and disconnected in the low power range. Device according to Claim 13, characterized in that the switch (61) bypasses the diode (62) in the low-power range. Device according to Claim 13 or 14, characterized in that the diode (62) is arranged on the rear side remote from the operating side of the housing (12, 13) of the power control device (11) on a switch (61) immediately bypassing it. 12 62426 Device according to one of the preceding claims, characterized in that the guide piece (18) supporting the guide curve (19) has a bearing pin (21) arranged therein, which is inserted into the opening (24) of the housing part (12) remote from the drive side and that the setting shaft (15) protrudes backward into the closed central hole (23) of the guide curve and forms a second bearing for the guide piece (18). Device according to Claim 16, characterized in that the guide body (18) supports with its bearing pin a coupling cam (22) for a switch (61) which bypasses the diode (62). 62426 13