DE1055366B - Appropriate safety device when a certain limit speed is reached - Google Patents

Description

GERMAN

The invention relates to a safety device which responds when a certain speed limit is reached with at least one safety regulator, the regulator body, flyweight and regulator spring has and in which the flyweight is relative to the regulator body by means of a lying in the regulator Piston 'and a pressure medium acting on this is radially movable, the pressure medium being supplied to the rotating regulator body from a stationary pressure medium source is fed from coaxially to the controller axis.

Safety regulators are attached to many machines, which release when a certain limit speed is reached and shutdown of the machine cause. The re-engaging of the controller then takes place at a considerably below normal value lying speed instead, because it is unstable controller.

To when checking the regulator these two. Initiating processes must, for example, in a steam turbine turbo generator set the machine is relieved and disconnected from the grid.

It has already been proposed to release the safety regulator by means of pressurized oil. In this way, the controller can be released at normal operating speed by reading the required oil pressure must be checked. The machine then does not have to be brought to overspeed. In order to enable the controller to re-latch, the speed must then be reduced below its normal value.

In the case of a control device of a steam turbine, one of the forwarding of the deflection movement was therefore used The pawl that serves the swing weight is used to adjust the swing weight after the test process into its latched position. However, the mechanical push in the regulator even more unfavorably than claimed by the quick-closing process that only occurs in the event of a malfunction.

The invention aims. to avoid all of the disadvantages described.

In the case of a safety device of the type described at the outset, the invention is used for this purpose the piston to be actuated with the pressure medium is designed to be double-acting, and there are two separate channels for the application of one or the other side of the piston intended. Next are for the transition of the pressure medium from the stationary pressure medium source the rotating regulator lying in the regulator axis, arranged coaxially to one another, between one another Pipes that leave an intermediate space and delimit at least a section of the said channels are present, those with one of the named relative-to-

When reaching a certain

Limiting speed responsive

Security facility

Applicant:

Escher Wyss G. mb H.,
Ravensburg

Claimed priority: '
Switzerland from December 10, 1955

Lothar Ehrlich, Zurich (Switzerland),

and Karl Friedrich Neubrand, Ravensburg,

have been named as inventors

rotatable parts are firmly connected to each other and in bores or annular spaces of the other part open, with gap seals for mutual sealing of the channels at the rotatable transition point are provided.

These measures make it possible to easily perform both the latching and the unlatching process to effect by means of pressure medium from a stationary pressure medium source and thereby practically not even taking up additional space in the regulator body.

The space requirement of the double-acting piston is practically no greater than that of the single-acting ¹ piston of the known designs. By means of the coaxial, fixed pipes protruding into the rotating regulator body in the regulator axis, two or more oil ducts can be guided separately from one another without any complicated components and, without the oil flow being noticeably hindered by the centrifugal forces, through the transition point of the parts that can rotate relative to one another.

The drawing shows an exemplary embodiment of the subject matter of the invention in a simplified representation illustrated. It shows here

1 shows an axial longitudinal section through a safety device, the two safety regulators arranged on the machine shaft and one fixed . Has distribution member for the pressure medium,

Fig. 2 is an axial longitudinal section through an individual Safety regulator.

809790/198

The safety regulator 1 with regulator body 2, flywheel 3 and regulator spring 4 has according to FIG. 2 a bolt 5 with a collar designed as a double-acting piston 6. In the regulator body 2 or in a sleeve 7 screwed to it, two cylinder chambers 8 and 9 are recessed, which are connected by channels 10 and 11 and 12 to a bore 13 and an annular channel 14 of a stationary distributor member 15, as shown in FIG. 1 is shown. A sealing system is arranged between the moving and the stationary parts. A channel 16 leads from the bore 13 to a slide 17, which has bores 18 and an annular groove 19 and is held in its end position limited by a collar 21 by a spring 20.

From the annular channel 14, a channel 22 leads to a slide 23 similar to the slide 17, which has bores 24 and an annular groove 25 and limited by a spring 26 in its by a collar 27 End position is held.

With 28 and 29 oil drains are designated. A manometer 30 is connected to the channel 22. A Channel 31 leads to a pressure oil connection 32.

In the position shown, the channel 16 is through the bores 18 of the slide 17 with the oil drain 28 connected; Likewise, the channel 22 is through the bores 24 of the slide 23 with the oil drain 29 tied together.

However, if, for example, the slide 17 is moved against the action of the spring 20, the connection becomes the bores 18 with the oil drain 28 are interrupted, and the annular groove 19 makes the connection between the channel 16 and the channel 31 and thus with the pressure oil connection 32.

If, on the other hand, the slide 23 is moved against the action of the spring 26, the connection is established the holes 24 interrupted with the oil drain 29, and the annular groove 25 provides the connection between the channel 22 and the channel 31 and thus with the pressure oil connection 32 ago.

A screw 33 allows the slide 23 to be fixed in the pressure position.

To check the safety regulator, the slide 23 is now moved by hand or by means of the screw 33 brought into pressure position so that the pressure in the channels 22,14,12,11 and in the cylinder chamber 9 gradually increases. The pressure medium exerts a force on the piston 6 which counteracts the force of the regulator spring 4. As soon as the differential force acting in the sense of the regulator spring is less than the centrifugal force of the Swingweight 3, the controller 1 disengages. The pressure prevailing at the moment of the disengagement can be read off on the manometer 30.

The slide 17 is then actuated and the cylinder space 8 is thus pressurized. The one from the pressure medium exerted on the piston 6 force is added to the force of. Regulator spring 4. As soon as the sum of the two forces exceeds the value of the centrifugal force corresponding to the disengaged swing weight, the controller 1 latches again.

In this way, the safety controller can be the normal speed without disturbance or interruption of the operation of the machine ·.

In the arrangement according to FIG. 1, in addition to the safety controller 1, there is also on the Masdiinenwelle a second safety regulator 1 'with press cylinders 8', 9 'attached, the channels 10' and 11 'on the Channels 10 and 12 are also connected to the distributor 15. The unlatching and relinking of controller 1 'is carried out in the same way as for controller 1. During the test, the Safety regulator set to a lower speed and with a further increase in the pressure of the pressure medium disengage the second controller. Also, the re-latching of the controls is then one after the other take place.

ίο It can also, for example, a second to the ring channel 14 arranged ring channel are provided, then the controller for the notching process have separate channels and operating slides, which means that the controllers can be checked independently of each other and allowed in any order. A joint is sufficient for the relinking process Activity.

While in the sealing system according to the example shown, the transition points from the stationary Distributor to the rotating safety regulator in the shaft axis and concentric to it Circular rings of different diameters are arranged, for example, is also a sealing system with these transition points in a row axial direction possible.

Claims (1)

Patent claims: 1. When a certain limit speed is reached, responding safety device with at least a safety regulator, which has regulator body, flywheel and regulator spring and in which the flyweight is relative to the regulator body by means of a piston located in the regulator and a pressure means acting on this is radially movable, the pressure means being the rotating regulator body supplied from a stationary pressure medium source coaxially to the regulator axis is, characterized in that the piston (6) is double-acting and two are separated mutually guided channels (10, 13; 11, 12, 14) for the application of one or the other Piston side are present, and that for the transition of the pressure medium from the stationary Source on the rotating regulator (1) lying in the regulator axis, arranged coaxially to one another, between each other leaving a gap free, at least a part of the mentioned · Channels . delimiting tubes are present, which with the one of said, relative to each other rotatable parts are firmly connected and in bores (10) or annular spaces (12) of the other part open, with gap seals for mutual sealing of the channels on the rotatable transition point are provided. 2. Safety device according to claim 1 with at least two safety regulators, characterized in that pressing cylinders (8, 8 '; 9, 9') of the individual safety regulators (1, Y) via common channels (10, 12) are in communication with the distributor (15). Considered publications:
German Patent No. 58o ^1077.
U.S. Patent Nos. 1,441,353, 1,662,104; Siemens-Zeitschrift, Volume 27, June 1953, Issue 4, pp. 196 and 197. 1 sheet of drawings