DE102008034321B4 - Fire protection drive - Google Patents

Abstract

Drive for a curtain (4) in the form of a smoke curtain, roller shutter, roller shutter, garage door, Feuerschutzbehanges, room divider or the like, with a drive motor (10) for rolling up the curtain (4) and with a working current brake (16) for braking the blind (4 ) when rolling, wherein a brake motor (14) is provided which is electrically connected to the working current brake (16), so that the working current brake (16) can be activated via the voltage generated during rolling of the brake motor (14), wherein the drive motor as an AC motor ( 10) and the brake motor is designed as a DC motor (14), drive motor (10) and brake motor (14) are arranged on a common shaft (12).

Description

Technical area

The The invention relates to a drive for a curtain in the form of a Smoke curtains, roller shutters, roller shutters, garage doors, fire brigade protection hangings, Room part or the like. This type of drives will be particular used in smoke protection devices, especially in a Normal position open are and are lowered in case of danger or fire, the fire protection hanging in the open state on a winding shaft is wound up.

Of the Drive has a drive motor for rolling up the curtain and a Arbeitsstrombremse for braking the curtain when unrolling.

State of the art

at Such smoke protection or fire curtains or shutters or Like. It is necessary that in the case of danger the hangings also automatically transferred to the closed position without effective electromotive drive or is rolled off. The electromotive drive is usually from a motor, in particular a tubular motor, with an electromagnetic Arbeitsstrombremse is mechanically coupled. Once the engine z. B. by smoke sensors, heat sensors or the like is actuated, the electromagnetic bleeder brake is deactivated, d. H. solved. Conversely, the working current brake is activated and thus effective, as long as the electric motor is not actuated. In the upper end position of the curtain, the working current brake in normal operation with 24 V acts and holds So that the curtain in the desired End position. In case of power failure, ie without voltage, the working current brake acts not anymore and the curtain falls by its own weight down. When the mains power fails an accumulator can also maintain the brake voltage, so that not every power failure, the curtain drops. in the Disaster, so if the entire power supply disconnected is and if the battery supply is no longer guaranteed is and / or the line connection between drive and control is interrupted is, would the curtain drain quickly because no more control function is available. Exactly for In this case, the brake is thought of as an additional braking device serves and in the true sense no holding function in the longer term enable should. As in case of danger necessarily the working current brake is disabled to the smoke protection curtain or the fire protection curtain in Closed position, there is the danger that in the event of a power failure or disruption of the Motor control an uncontrolled shutdown of the curtain in the closed position occurs, causing the curtain due to the acceleration occurring or moments damaged can be. In addition, there is also the risk of injury to the Hazardous event passing through the curtain or passing under the curtain People.

To prevent this has already been proposed ( DE 1 96 10 876 ), to provide a centrifugal friction brake, which responds at a speed above the rated speed of the winding shaft speed and ensures a controlled lowering of the curtain. This mechanical solution requires the friction brake another component, which makes the overall device more expensive.

on the other hand was used to limit the speed of DC motors in braking mode at Descent of the curtain, already proposed, defined electric resistors to be installed in the armature circuit; in that regard, please refer to VEM manual, Die Technik electrical drives, fundamentals, VEB Verlag Technik, Berlin, 7th edition, 1979, page 56 to 58 referenced. The DC drive is As a result, a generator is loaded and delivers a braking torque. In order to prevents the speed from rising to an unduly high level during regenerative operation can and the engine, z. B. by excessive centrifugal forces on the armature winding or due to excessive voltage at the noise filter, destroyed becomes. Specifically, there is a resistance across the drive motor Relaisöffnerkontakt connected in parallel with the anchor. In addition, it is parallel to the anchor a 12 volts relay connected in series with a diode. This relay can in the driveway tighten and open the normally closed contact, so that the resistance on driveway does not come into effect. On the other hand at departure, if the polarity is different, then this will Relay not actuated, so that the resistor together with the anchor has a closed Circuit forms and generates a braking torque. The different polarity or the connection or disconnection of the resistor in sequence the different polarity is most easily done by a diode.

However, the inserted armature resistors act over the entire speed range, ie, even when starting the counter torque or the inhibition of the drive increases. For applications with increasing acceleration force, such. As smoke curtains, occur strongly different load moments, which are caused by the increasing weight of the draining curtain, whereby the dimensioning of the built-in armature resistance is problematic. Here a compromise must be chosen for easy automatic starting and for limiting the maximum speed. For very large load changes, this is very difficult or not possible. The inserted armature resistance must namely dependent on the slope weight. At high curtain weights, a small resistance is used. Of course, the small resistance also impedes starting in the upper position. Thus, additional weight on the lower rail is necessary to ensure safe starting in all operating conditions. This reduces the allowable effective area of the curtain and it may not be used in the intended size. Furthermore, there is a constant acceleration of the curtain during departure, ie the maximum speed is reached at the end of the fall of the curtain. Difficult is thus the setting of a desired constant speed or speed of the curtain.

Furthermore, from the DE 43 44 424 A1 a braking device for an electric motor known, wherein on the shaft of the electric motor, a permanent-magnet generator is arranged, the output fed with switched-off electric motor, the field coil of an also connected to the shaft eddy current brake and thus causes a network-independent braking of the electric motor. Finally, out of the DE 42 23 216 A1 a safety device for electric motor, in which the electric motor operates as a generator in case of power failure and is used for emergency power supply of a control device and for performing emergency functions.

Furthermore, in the DE 196 37 039 C1 discloses a braking device for a curtain of the type mentioned, which provides an electrical connection between an electric motor and a working current brake during unwinding, so that the voltage generated by the electric motor when rolling activates the working current brake. The electric motor, which also serves to roll up the curtain on a winding shaft, is designed there as a DC motor. However, such DC motors have the disadvantage that for their operation, a transformer is required, which converts the usually present as AC voltage mains voltage into a DC voltage. Such transformers are lossy and also pose a fire risk itself.

JP 05-231081 A discloses a drive for shielding or protective devices, wherein an AC motor is provided as the drive motor. For emergency operation is disclosed as a second motor, a DC motor, which is connectable to a DC voltage source.

DE 196 105 32 A1 discloses a curtain with a sheet of temperature-resistant material wound on a winding shaft. To drive a cooperating with the winding shaft motor is provided, which is operable as a generator.

task

task The invention is thus a drive of the type mentioned develop further to the effect that the operation of such a drive Without a transformer of a mains voltage is possible and that in case of fire nevertheless a self-sufficient operation and a braked unrolling of the blind allows is.

Presentation of the invention

The Invention is solved by a drive according to claim 1.

One drive according to the invention for one Behang of the type mentioned has a drive motor for Roll up the blind on and one with a working current brake for braking the curtain when unwinding electrically connectable brake motor, so that the voltage generated by the brake motor when rolling the blind can be used to activate the working current brake.

Of the The invention is therefore based on the basic principle of separate motors for the Roll up the curtain and provide for operation of the working current brake. It became surprising found that two separate engines face a motor exactly to the respective requirements are interpretable, so that despite the additional Motors the number of required components and thus the manufacturing cost are reduced. The brake motor becomes regenerative in the event of unwinding operated, so converts mechanical energy into electrical energy around.

there the drive motor is designed as an AC motor. An AC motor can be operated with the AC mains voltage, creating a Generator is redundant. That way, first the efficiency of the drive device when pulling raised. The brake motor is preferably de-energized in the drive for rolling up the curtain, so for Running the brake motor consumes virtually no energy becomes.

Of Furthermore, the brake motor is designed as a DC motor. The Most working current brakes need to operate also DC, so through the use of a DC motor, a conversion of the current is unnecessary. In order to can save further components and reliability increase the device.

In this case, the drive motor, brake motor and / or operating current brake are particularly preferably arranged on a common shaft. The arrangement on a common shaft can be realized particularly well compact arrangements chen.

Prefers In this case, the brake motor is designed such that it has one of the operating voltage the Arbeitsstrombremse provides appropriate output voltage. Leave it the provision of series resistors or the like between the brake motor and the working current brake. It can be provided that the brake motor is an output voltage generated, which within the allowable voltage tolerances the drive current brake is or exactly the operating voltage of Drive current brake has.

Prefers is provided that drive motor, brake motor and / or break current brake are arranged in a rotationally fixed connection to each other. In the way are complex coupling devices and complex superposition gear not mandatory.

Conceivable It is also when the brake motor as part of the drive motor is trained. This can be achieved by several anchors provided in the engine, which are connected differently, be realized, where the anchors can be arranged in one or more planes of rotation.

Prefers the drive is designed as a tubular drive. Such tubular drives are standardized and are therefore drives with special dimensions and Special forms often prefers.

Further Objectives, features and advantageous applications of the invention will become apparent from the following description of an embodiment with reference to the Drawings. All form described and / or illustrated features in their meaningful combination the subject of the present invention, too independently from the claims and their remittances.

Brief description of the figures

The single figure shows a drive according to the invention for a Smoke protection curtain in a schematic representation.

embodiment

The single FIGURE shows a drive according to the invention 2 for a smoke protection curtain 4 in a schematic representation.

The drive 2 is in a pipe 6 housed, which has an output shaft 8th having, either as a winding shaft for the smoke curtain 4 is itself trained, or the rotationally fixed to a separate winding shaft of the smoke curtain 4 attachable. The output shaft 8th is via an AC motor 10 driven upwards in an open position. Not shown in the figure is a capacitor for motor operation of the drive.

The drive motor 10 works with a corresponding local mains voltage, in central Europe, ie about 230 volts, in the US about 110 volts. On the same wave 12 coming from the engine 10 is driven, sits a brake motor 14 working with DC. Continue on the wave 12 a drive current brake 16 provided, which for slowing down the rolling of the smoke curtain 4 serves. Last is a limit switch 18 provided with which the drive current brake 16 can be activated or deactivated and the drive motor 10 is turned off.

drive motor 10 , Brake motor 14 and drive current brake 16 act on the drive side with a gearbox 20 together, which output side with the output shaft 8th connected is.

The control of the drive according to the invention via a controller 22 , The control 22 is connected to a mains voltage V, with which the AC motor 10 is energized as soon as a control command for rolling up the smoke curtain 4 is delivered.

The gear 20 is usually designed as a reduction gear.

The control 22 also has the task of ensuring a safe function of the smoke protection curtain 4 to ensure. The working current brake 16 is an electromagnetic brake, which is activated when the drive motor 10 is disabled and vice versa. With de-energized drive motor 10 , for example in the upper end position in normal operation, is the working current brake 16 energized and holds the smoke screen 4 in the desired position.

In de-energized state, for example in case of prolonged power failure or the like, the working current brake 16 disabled. As a result, the smoke curtain winds 4 Due to gravity, which over the drive shaft 8th , The gear 20 and the drive shaft 12 the DC motor 14 is turned. The brake motor 14 is operated in this case as a generator and generates the operating voltage of the drive current brake 16 , for example 24 volts.

By means of the controller 22 then becomes the drive current brake 16 activated, the smoke protection curtain 4 is slowed down. If the smoke screen 4 is braked far enough, the Drive current brake 16 again without electricity, the smoke protection curtain 4 accelerates again and the process described above begins again.

The smoke protection curtain 4 is thus not lowered evenly in an emergency, but in a kind of stuttering operation. Other types of control that allow a uniform braked lowering, but also readily conceivable.

LIST OF REFERENCE NUMBERS

2

drive

4

Smoke curtain

6

pipe

8th

output shaft

10

drive motor

12

wave

14

brakemotor

16

Drive current brake

18

limit switch

20

transmission

22

control

V

mains voltage

Claims (5)

Drive for a blind ( 4 ) in the form of a smoke protection curtain, roller shutter, roller shutter, garage door, Feuerschutzbehanges, room divider or the like, with a drive motor ( 10 ) for rolling up the curtain ( 4 ) and with a working current brake ( 16 ) for slowing down the blind ( 4 ) when unrolling, with a brake motor ( 14 ) provided with the working current brake ( 16 ) is electrically connected, so that the working current brake ( 16 ) about the voltage generated during rolling of the brake motor ( 14 ) is activated, wherein the drive motor as an AC motor ( 10 ) and the brake motor as a DC motor ( 14 ) is formed, drive motor ( 10 ) and brake motor ( 14 ) on a common wave ( 12 ) are arranged. Drive according to claim 1, characterized in that the brake motor ( 14 ) one of the operating voltage of the working current brake ( 16 ) has corresponding output voltage. Drive according to one of the preceding claims, characterized in that the drive motor ( 10 ), Brake motor ( 14 ) and / or working current brake ( 16 ) are arranged in rotationally fixed connection to each other. Drive according to one of the preceding claims, characterized in that the brake motor ( 14 ) as part of the drive motor ( 10 ) is trained. Drive according to one of the preceding claims, characterized in that the drive as a tubular drive ( 2 ) is trained.

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