DE1903236A1 - Thermoelectric fuse device with two push buttons - Google Patents

Description

Junkers 433 PLI-Th / Fi July 20, 1970

P 19 03 236.1 (copy)

JU N K i] RS & GO. GI-IBH. in Wernau / lTeckar

Thermoelectric ignition safety device with two / one pushbuttons

Addendum to patent (patent application P 16 01 316.4)

The invention relates to a thermoelectric ignition safety device with two pushbuttons, of which the first button serves as the off button to shut off the gas supply and the second as the operating button assigned to the ignition valve, and with a locking slide that can be moved along the two button displacement paths against spring pressure across the button displacement direction, v / elcher has an opening and locking curve assigned to the off button and at least one opening curve assigned to the operating button, which cooperate with a projection arranged on each button so that the projection of the off button engages under a detent when the button is pressed after the locking slide has been moved , while the approach of the ÜQtriebstaste when it is pressed by further advancing the locking slide releases the locking of the Aua button, with the closing member of a main Lgaaveritila, which only dominates the main gas line, being guided at the free end of the pushbutton of the operating button and de A locking spring is assigned to the operating button, the free leg of which is extended by an extension which is dependent on the position of the closing elementa of the ignition safety valve

009843/0942 bad original _ ₂ "

Junkers 433

are spreadable, and that the operating button can only be pressed is when the extension of the free legs of the locking spring are spread apart, but with the off button and locked With the ignition safety valve still open, the end of the push button of the operating button when it is pressed onto the free legs of the locking spring occurs, so that the latching position is canceled via the approach to the operating button assigned to the locking slide the off button is impossible. The invention is an addition to the patent (patent application P 16 01 316.4).

According to the main patent, it was proposed that the off button for shutting off the gas supply is assigned an inlet valve arranged coaxially to the pressure ram of the Auslas te, the closing member of which is slidable relative to the pressure ram against the force of a compression spring, which is between one after the off button is clamped to the locking disc connected to the locking member and an unlocking disc secured in position on the plunger, to which at least three locking levers are assigned to the housing and are fixed approximately parallel to the plunger Attached locking disk underneath , which is released when the off button is pressed by spreading the locking lever by means of the unlocking disk. In addition, it was proposed according to the main patent that the operating button should be assigned a known locking spring in a plane located between the valve seats of the ignition safety valve and the main gas valve and parallel to the valve seats conical tip of an extension of the valve pin of the ignition safety valve which protrudes beyond the closing element of the safety valve and which rests with its free legs on the cylindrical part of the extension that adjoins the tip, and that at the end of the plunger of the operating states directed towards the closing element of the safety valve is attached, v / elcher one of the top of the

BAD ORiGINAL

00984 3/0942

Junkers 433

Has extension corresponding, conical recess and with its edge at such a distance from the cone apex of the extension of the valve pin is arranged that "when you press the operating button only then a form-fitting connection with the cone tip the extension of the valve stem comes about when the conical Tip of the extension of the valve pin through the locking spring protrudes through, but "when the ignition safety valve is still open, the edge at the base of the pressure tappet on the free legs the locking spring strikes so that over the the locking slide associated approach to the operating button, it is impossible to cancel the latched position of the off button.

It has now been found that the function of the ignition safety device when the inlet valve is in the closed position and the ignition safety valve is still open, this can be improved if the Closing member of the ignition safety valve loading closing spring can act completely independently of the restart interlock. For this purpose, a thermoelectric ignition safety device is attached with two pushbuttons of the type mentioned at the beginning, i.e. with an inlet valve assigned to the off button in one embodiment according to the main patent as well as with one of the operating buttons associated thermoelectric ignition safety valve in an im essentially with the training according to the main patent matching training provided that the extension by a cylinder pin is formed, which is directed towards the closing member of the ignition safety valve and the free legs of the Locking spring spreading spreading part and a guide part consists, which is connected to the cone with the expanding part via a tapered after the operating button and with one on its inside End provided collar guided in an axial recess of the push button of the operating button against a compression spring and is secured against falling out by a safety device, and that the free end of the pressure plunger has a radially inward direction having extending conical edge, the conicity of which corresponds to that of the cone of the cylinder pin.

BAD 009843/0942

• Junkers 433

The arrangement is such that the length of the expansion part of the cylinder pin is approximately the distance between the opposite sides of the closing element of the ignition safety valve and the locking spring corresponds to ^. Furthermore, the length of the Guide part of the cylinder pin larger than the length of the expanding part. It is also provided that the cylinder pin is secured against falling out by a snap ring or a hairpin spring is formed, which or which penetrates diametrically opposite slots, which between the free end of the Pressurization of the operating button and the one directed towards this Shoulder of the collar on the guide part of the cylinder pin on the pressure tappet are appropriate.

This training ensures that the closing member of the The closing spring assigned to the ignition safety valve has no function in the context of the restart interlock, but can act completely independently of the latter. In addition, results the further advantage that in a trained according to the invention Armature magnetic inserts of normal design can be used, as the extension of the valve stem provided according to the main patent on the closing member of the ignition safety valve by the inventive Extension is replaced, which is essentially in connection with the push button of the operating button.

The subject matter of the invention is based on an exemplary embodiment the drawing explained in more detail. Show it:

FIG. 1 shows a partial longitudinal section through a thermoelectric ignition safety device designed according to the invention in their rest position;

FIG. 2 shows a section through part of the ignition safety device according to the line II - II of Figure 1;

FIG. 3 shows a partial longitudinal section corresponding to FIG. 1 through the ignition safety device, but in de: / ignition position;

009843/0942 BATH ORIGINAL "5 -

Junkers 433

FIG. 4 shows a section through part of the ignition safety device according to the line IV - IV of Figure 3>

FIG. 5 shows a part corresponding to FIGS. 1 and 3 Longitudinal section through the ignition safety device, but in its operating position;

FIG. 6 shows a section through part of the ignition safety device according to the line VI - VI of Figure 5;

7 shows a part corresponding to FIGS. 1, 3 and 5 Longitudinal section through the ignition safety device, but in its locked position;

FIG. 8 shows a section through part of the ignition safety device according to the line VIII - VIII of FIG. 7.

As in the main patent, the thermoelectric shown in the drawing Ignition safety device housed on its own or in conjunction with others in a common housing Find control parts use. In the housing 10, an inlet valve is arranged in the same design as in the main patent, which is not shown in the drawing. The gas flowing into the further gas passage space 16 is from a thermoelectric Ignition safety valve 17 dominates over a gas passage space 18, from which ignition gas via an ignition gas inlet opening 19 are led in a known Yfeise to a pilot burner can. Likewise, a main gas valve 20 is arranged at the end of the gas passage space 18, which a gas passage space 21 with a Gas outlet opening 22 is connected downstream. The closing member 25 of the ignition safety valve 17 is a valve seat 26 and the closing member 27 of the main gas valve 20 is assigned a valve seat 28. To operate the 3 inlet valve and the ignition safety valve 17, in the same way as in the main patent two pushbuttons are provided, of which the first is all assigned to the inlet valve and thus the

- 6 009843/0942

Junkers 433

Gas supply shut-off button 31 and the second as the ignition safety valve 17 and the main gas valve .20 associated operating button 32 is used. The operating button 32 is just like the off button 31 firmly connected to a pressure tappet 34 and by a return spring 36 acted upon. The off button 31 and the operation button 32 are in a recess of a housing cap placed on the housing 10 37 out, on whose longitudinal wall located behind the keys a known locking slide is attached, its training and effect is explained in more detail in the main patent. The operating button 32 with its plunger 34 is in the same way as in the main patent in one within the gas passage space 18 between the valve seat 26 of the ignition safety valve 17 and the valve seat 28 of the main gas valve 20 located and parellelen to these valve seats level associated with a known locking spring 50, which in the ! Figures 2, 4, 6 and 8 in a larger scale Ilasstab with their details as shown in the main patent. This locking spring 50 is, however, also with free leg ends 511 and 521 as well as bends 512 and 522 are formed. The closing element 25 of the ignition valve 17 is connected via a valve pin 56 to the armature plate 57 of a magnet insert 58, which is in the end wall of the lower housing part 101 is fastened in a manner known per se by means of a screw connection 59, to which in per se is likewise known Alternatively, a thermocouple can be attached, the head of which is heated by the pilot burner. The magnet insert 58 has an electromagnet 60 with a winding 61, which is fed from the thermocouple when its head is heated, thermal current.

The extension 561 of the valve pin 56 of the ignition safety valve 17 provided according to the main patent is not present according to the invention, so that a commercially available magnet insert 5 can be used. The extension 561 of the valve pin 56 provided according to the main patent is formed according to the invention by a cylinder pin generally provided with the reference numeral 70, which in axial succession consists of a closing element 25 of the ignition safety valve 17 and the free ones

- 7 -009843/0942

Junkers 433

Legs 511 and 521 of the locking spring 50 spreading spreading part 701, a cone to be tapered after the operating button 32 702 and a guide part 703 ″, which with one on his inner end provided collar 704 in an axial recess 71 of the plunger 34 of the operating button 32 against a compression spring is slidably guided. The cylinder pin 70 is secured in the area of the axial recess 71 of the pressure ram 34 secured against falling out, which is formed by a snap ring or a hairpin spring 73. This fuse penetrates on the pressure tappet 34 diametrically opposite slots, which is attached between the free end of the pressure ram 34 and the collar 704 on the guide part 703 of the cylinder pin 70 in the V / eise are that the fuse also serves as a driver for the closing member 27 of the main gas valve 20. The axial recess 71 of the plunger 34 of the operating button 32 ends in a radial direction inwardly extending conical edge 74, the conicity of which corresponds to that of the cone 702 of the cylindrical pin 70. The length of the expansion part 701 of the cylinder pin 70 corresponds approximately to your distance between the opposite sides of the closing member 25 de3 ignition safety valve 17 and the locking spring 50. The length of the guide part 703 of the cylinder pin 70 is greater than the length of the expanding part 701.

The function of the ignition safety device is as follows:

V / enn assumed the position of rest of the device according to FIG. 1 becomes, in which both the inlet valve and the ignition safety valve 17 are in the closed position, an with the ignition safety device provided gas-heated device can be put back into operation by pressing the operating button 32. Leg impressions the operation button 32 becomes the off button 31 in the same Unlocked as with the main patent, so that at the same time the inlet valve comes into its open position, which is retained, as long as there is no transition to the by pressing the off button 31 Closed position of the inlet valve is intended. In which

- 0 009843/0942

Junkers 433

Pressing the operating button 32 is simultaneously from the pressure surge 34 of the operating button 32 from the cylinder pin 70 the Schliessglicd 25 of the ignition safety valve 17 is lifted from its valve seat 26 and at the same time the anchor plate 57 is placed on the electromagnet 60 of the magnet insert 58. This position is shown in FIG. In the rest position according to Figure 1, the free end of the expansion part 701 of the cylinder pin 70 is located between the free Legs 511 and 521 of the locking spring 50 and spreads them Free Sahenlcel apart · When pressing in the operating statec 32 is first the compression spring 72 in the recess 71 of the compression. plunger 34 compressed until the conical edge 74 of the pressure plunger 34 comes to rest on the cone 702 of the cylinder pin 70, and now the plunger 34 pushes the cylinder pin 70 in the direction of the Closing member 25 of the ignition safety valve 17 takes with it. One such The locking spring 50 does not stand in the way of movement, since the pressure ram 34 with its free end rests on the cone 702 of the cylinder pin 70 can easily slide through the free legs 511 and 521 of the locking spring 50. That by being in the open position The inlet valve located in the gas passage space 16 reached Gas can pass through the ignition safety valve 17, which is now in the open position, into the gas passage space 10, which is completed during the pressing movement of the operating button 32 by the closing member 27 of the main gas valve 20, which in the Depression of the operating button 32 from its open position into the Passes closed position. From the gas passage space 18 can over the ignition gas inlet opening 19 flow ignition gas to the pilot burner and are caused to ignite at this. As soon as that heated by the pilot burner Thermocouple supplies enough thermal current to excite the electromagnet 60 of the magnet insert 58 to a sufficient extent, so that the armature plate 57 adhere to the electromagnet 60 and thus also the closing element 25 of the ignition safety valve 17 in the open position remains, the operating button 32 can be in its outer position are left behind, the closing member 27 of the main gas valve 20 being lifted off its valve seat 28 again and thus gas in the gas passage space 21 and through the gas outlet opening 22 can flow to the main burner of the device, through which it passes

009843/0942 - 9 -

^J Junkers 433

the burning pilot flame is ignited. Thus, the operating position of the device shown in Figure 5 is reached, in which the free end of the expansion part 701 of the cylinder pin 70 again engages between the free legs 511 and 521 of the locking spring, since "when the operating button 32 is left behind, the cylinder pin 70 participates in part of the outward movement When the operating button 32 is left in its outer position, the compression spring 72 first relaxes until the hairpin spring 73, provided as a safety device, rests against the shoulder formed on the collar 704 of the cylinder pin 70 and, as the push button 32 moves further outwards, the cylinder pin 70 with it outwards pulls \ lenn the unit out of service to be set, this is done by pressing the power button 31, the inlet valve which in its closed position and the power button reaches its latched position 31st in this position while the inlet valve assumes its closed position a , however, this is ignition fuse gsventil 17 is still in the open position as long as sufficient thermal current is supplied by the thermocouple, which is no longer heated but has not yet cooled down, to hold the armature plate 57 on the electromagnet 60 of the magnet insert 58. The main gas valve 20 is also in the open position and continues to do so. Nevertheless, due to the closed division of the inlet valve, gas can no longer flow to both the pilot burner and the main burner, so that the flames on both burners go out.

If an attempt were made to restart the device in the period between pressing the off button 31 and the armature plate 57 falling off the electromagnet 60 of the magnet insert 5 &, this could result in the still open ignition safety valve 17 and the open main gas valve 20 release unburned gas to the burner. This possibility is excluded by the locking spring 50 and the cylinder pin 70. When an attempt is made to press the operating button 32, the cylinder pin 70 is displaced in the direction of the closing element 25 of the ignition safety valve 17 by the compression spring 72. First, the expansion part 701 of the cylindrical pin 70 passes through the

009843/0942

- 10 -

~ ~ Junkers 433

free legs 511 and 521 of the locking spring 50 through and after the cone 702 of the cylinder pin 70 has passed through the free legs 511 and 521, the guide part 703 of the Cylinder pin 70 between the free legs 511 and 521 of the locking spring 50, which thus have their cranked ends 512 and 522 is in abutting position in which the spacing between the free legs 511 and 521 of the locking spring 50 is smaller than the diameter of the expansion part 701 of the cylinder pin 70 or of the pressure surge 34. In this way, the am Conical edge 74 located free end of the pressure ram 34 no longer pass through the free legs 511 and 521 of the locking spring 50, but is due to the impact on these legs prevented from further inward movement. This possible inward movement of the pushbutton 32 with the plunger 34 until it hits from its free end to the legs 511 and 521 of the locking spring 50, on the other hand, is not sufficient to move the locking slide and to release the latching position of the off button 31. So it is furthermore ensures that the inlet valve is in its closed position remains and therefore no unburned gas can flow to the burners of the device. V / hen after an attempted impression the operating button 32 left them in their outer division the position shown in Figure 1 of the free end of the expansion part 701 of the cylinder pin a 70 between the legs 511 and 521 of the locking spring 50. Only when the Armature plate 57 falls off the electromagnet 60 and thus the closing link 25 of the ignition safety valve 17 in its closed position ° the device has to be started up again in the previous step described way possible.

BATH ORIGINAL

- 11 -

009843/0942

Claims (4)

Junkers 433 claims 1.JThermoelectric ignition safety device with two pushbuttons, of which the first button is used as the off ^ button to shut off the gas supply and the second operating key assigned to the ignition safety valve serves, and with one along the two key displacement paths locking slide, which can be moved against spring pressure transversely to the direction of the push-button movement and which has an overrun and locking curve and at least one of the operating button assigned. has ordered run-up curve, which with one on each Taute arranged approach cooperate, so that the approach of the off button when pressed after moving the locking slide engages under a locking lug, while the approach of the operating button when it is pressed by further moving the locking slide the locking of the off button is released, with the closing element of only one at the free end of the push button of the operating button the main gas valve dominating the main gas line is routed and a locking spring is assigned to the operating button, whose free legs can be spread apart by an extension which is dependent on the position of the closing element of the ignition safety valve and that the operating button is only to be pressed when the free legs of the locking spring are due to the extension are spread apart, but with the off button and locked with the ignition safety valve still open, the end of the push button of the operating button when it is pressed onto the free legs the locking spring strikes so that over the the locking slide associated approach to the operating button a lifting of the Einra3tateeilung the off button is impossible, addition to Patent (patent application P 16 01 316.4), thereby gekennz eichnet that the extension is formed by a cylinder pin (70), which from one after the Closing member (25) of the ignition safety valve (17) and the free legs (511, 521) of the locking spring (50) 009843/0942 - 12 ORIGINAL BATHROOM ¹² Junkers 435 spreading part (701) and a guide part (703) "which is connected to the spreading part (701) via a cone (702) that tapers towards the operating button (32) and with a collar (704) provided at its inner end in an axial recess (71) of the plunger (34) of the operating button (32) is guided displaceably against a compression spring (72) and secured against falling out by a fuse (73), and that the free end of the plunger (34) a has a radially inwardly extending conical edge (74), the conicity of which corresponds to that of the cone (702) of the cylindrical pin (70) » 2. Device according to claim 1, characterized in that that the length of the expansion part (701) of the cylinder pin (70) is approximately the distance between the opposite sides of the closing element (25) of the ignition safety valve (17) and the locking spring (50) corresponds. 3. Device according to claim 1, characterized in that that the length of the guide part (703) of the cylinder pin (70) is greater than the length of the expansion part (701). 4. Apparatus according to claim 1, characterized in that that the safeguard (73) against falling out of the cylinder pin (70) is formed by a snap ring or a hairpin spring is, which or which penetrates diametrically opposite slots that are located between the free end of the pressure ram (34) the operating button (32) and the shoulder of the collar (704) facing this on the guide part (703) of the cylindrical pin (70) are attached to the pressure tappet (34). 009843/0942 Blank page