DE187926C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- .M 187926 CLASS 47 /. GROUP

PAUL KUGEL in DÜSSELDORF. Stuffing box for shafts.

Addendum to patent 179322 of December 1, 1904.

Patented in the German Empire on July 5, 1906. • Longest duration: November 30, 1919.

The invention relates to a device which the stuffing box according to patent 179322 makes usable even if due to design or execution errors the relief is driven to over-relief. This facility can be done in a very simple way by switching on a valve, that the pressure in the relief chamber

reduced as soon as the over-relief is reached, and lets it work in full strength, as long as the relief remains within permissible limits.

The drawing shows three exemplary embodiments in longitudinal sections through the stuffing boxes shown. In all figures it is assumed that due to incorrect dimensioning of the parts in question, the stuffing box is overloaded.

The valve consists in Fig. 1 of an angle ring m, which is indirectly screwed to the housing α. The valve seat is formed by the closing ring e ^{1 of} the sleeve e. The adjustment of the valve ring m to be effected from the outside is made so that the valve is closed as soon as the rings c and d press one another, ie seal the pressure chamber to the outside. If the last-mentioned rings move away from each other as a result of over-relief, the valve is opened, ie the pressure is released from the relief chamber i . However, this eliminates the over-relief, the rings c and d come back into mutual contact, whereby the valve m is also closed. As a result, however, over-relief occurs again immediately, and the game described begins anew. In reality, the same will be very small, so that the mutual position of the rings c and d will adjust itself so that the latter act sealingly on each other with little pressure and the valve always remains open by a small amount, i.e. leaks somewhat.

The valve m can of course also be attached to the shaft b secured in its position or have any other shape and position. The only condition remains that the position of the valve and seat must be influenced by the position of the sleeve e.

The installation of a special valve can be avoided if it is possible to use two or more of the cooperating rings c and d as a valve or regulating element for the discharge of the pressure medium, which are distant from each other when over-relieved, that is, a path for the passage of the pressure medium to train the relief chamber. As shown in FIG. 2, this can be achieved immediately when the connecting channel k, which supplies the pressure medium to the relief chamber i , is not straight through but opens out to k ^{1, as shown in FIG}

that now the ring d ^l as a valve body between the seats c ¹ , c ² plays in such a way that when the ring d 'moves to the left, the pressure medium access becomes more difficult, the pressure medium outlet from the chamber i, however, is opened and enlarged. It can be seen that with normal gait the relief chamber i is directly connected to the pressure chamber through the channel k, k * and the path to the

ίο is locked outdoors. However, if over-relief occurs, the sleeve e moves to the left, and the relief chamber i is connected to the open air, ie the pressure , through the bore k ¹ and the spaces between the rings d ¹ , c ² and d ² , c ³ in chamber i is reduced. At the same time, the approach of the ring d ¹ to c ¹ results in a more or less complete blocking of the channel k ¹ from the pressure chamber, so that the pressure in chamber i can only supplement each other to a small extent or not at all.

The reduction in pressure in the

Chamber i , however, causes the bushing e to be shifted to the right again, the rings d ¹ , c ² slide against each other, the connection of the channel k, k ¹ with the open air is consequently blocked again and the pressure reduction in the chamber i is ended. The pressure medium, which occurs again with full tension, now again generates over-relief, and the processes are repeated in the manner described. In fact, a middle state will also be established here which always releases some pressure from the relief chamber and thereby regulates the relief in the desired manner.

Fig. 3 shows the arrangement again in the event that the relief chamber is located on the pressure side. The rings d ² , c ¹ and d ¹ work together here as a valve . The bore A: ² , which respectively the relief chamber i with the pressure chamber. connects with the outdoors, is influenced here in the same way as in FIG. 2 by the valve d ' ² , c ^l , d ¹ .

The play and the action of the rifle are exactly the same as in the cases of Fig. Ι and 2. The activation of the control valve accordingly eliminates the harmful Influence of a too large relief piston.

^{The grooves o 1} , o ^{2 can be} provided in order not to interrupt the flow of pressure medium even when the bushing moves too much, during which the surfaces of the rings that would otherwise not work against one another would touch.

Instead of one valve, several can be used.

Claims (1)

Patent claim: Stuffing box for shafts according to patent 179322, characterized by a valve which connects the relief chamber (i) in the event of over-relief with the open air or with a space of lower pressure and at the same time can make access of the pressure medium to the relief chamber difficult or close. 1 sheet of drawings.