DE3202966A1 - Electrohydraulic drive unit for wings of doors or the like - Google Patents

Abstract

The electrohydraulic drive unit for wings of doors or the like has a piston (9) which can be displaced counter to the force of a closing spring (10) by means of a pump (2) when the solenoid valve (8) is closed, until the end position corresponding to the open position of the wing coupled to the piston (9) is reached. If the pump (2) is then stopped while the solenoid valve (8) remains closed, the closing spring (10) displaces the piston (9) due to slight leakage in the hydraulic system. As soon as this displacement has reached a predetermined slight amount, the pump (2) is briefly put into operation again, with the result that the piston (9) and the wing are once more moved into the abovementioned end position. <IMAGE>

Description

The invention relates to an electro-hydraulic

Drive unit for wings of doors or the like. with cylinder-piston unit, its inlet side with the interposition of a non-return device (e.g. non-return valve) on the pressure side of an electrically driven hydraulic pump and on the outlet side with the interposition of an electrically controllable, open in the de-energized state Solenoid valve connected to a reservoir for hydraulic fluid piston working space one drive-coupled to the wing and in the closing direction by means of a closing spring of the wing acted upon piston slidably receives, which his when closed Solenoid valve can be reached by switching on the hydraulic pump, against the force of the Closing spring pushed forward, the open end position corresponding to the open position of the sash is essentially maintained with the solenoid valve closed and the pump switched off.

With such drive units it must be taken into account that the piston its open end position with the solenoid valve closed and the pump stopped not permanently maintained unchanged, as there are minor leaks in the hydraulic system, for example the valves and piston seals, are unavoidable and lead to that the Closing spring pushes the piston over time according to the The closing direction of the sash shifts.

So if the wing or wings of a door or the like. kept open all the time are special measures to prevent a gradual closing movement necessary.

For this purpose it is known to lock the wing mechanically. However, this prevents the sash from opening in the event of a power failure Solenoid valve is automatically closed by the closing spring, as in particular is required for doors that are used to secure a building from fire For safety reasons in the event of a power failure.

It is also known to use the wing or wings in the open position to lock electrical holding magnets, which the respective wing in the de-energized Release state automatically. Apart from the additional power consumption increase the holding magnets the installation effort, After all, it is known the hydraulic pump is continuously in operation, possibly at a reduced speed to hold in order to maintain a pressure within the piston working space, which moves the piston against the force of the closing spring in the open end position can hold. With this arrangement, however, the one that drives the hydraulic pump becomes Electric motor heavily loaded, so that special cooling measures for the electric motor required are. As a rule, the hydraulic pump in such a case requires electric motors with external ventilation, so that in addition the power consumption to operate the fan and the electric motor, as well as fan noise as well as engine noises are to be accepted.

It is therefore the object of the invention to provide an electrohydraulic drive unit to create which the maintenance of the permanently open state of the sash with with minimal effort and in the event of a power failure, the Wing allowed by the closing spring.

This task is achieved by means of a signal transmitter from the piston or a member that is coupled in terms of movement shortly before reaching the open end position is operated and cooperates with a control device which the hydraulic pump starts up briefly when the piston is to be held open Wing out of its open end position beyond its position which actuates the signal transmitter in the sense of closing the wing.

According to the invention it is thus allowed that the wing is also at permanently open door or the like.

insignificantly, i.e. to a harmless and harmless degree can remove its open position before turning on the pump is postponed.

Even if the wing has only very little room to move and comparatively large tolerances in the manufacture of the hydraulic system approved, the hydraulic pump and the associated electric motor must be used keeping the sash open only very rarely (about every two hours) and be put into operation for a very short time (e.g. one to two seconds), so that the loads on the electric motor are much lower in each case remain than in normal operation, in which the wing responds to the signal of a contact sensor, For example, a motion detector that responds to the movements of passers-by in the door area, briefly is opened.

In no conceivable case does the electric motor stay switched on all the time, so that switch-on phases always follow more or less long switch-off phases, which ensures an overload of the motor even in the absence of special cooling measures impede.

A binary signal generator is preferably used, which is his assumes a state when the piston is in an area near its open end position is, and in all other positions of the piston maintains its other state.

For example, an electrical switch is suitable for this purpose, which by means of an organ coupled in terms of movement to the piston, e.g. a cam Or the like., Can be operated mechanically. Such switches are generally considered to be travel-dependent actuated switches or limit switches known and represent inexpensive series products represent.

The signal transmitter is expediently on an adjustable stop arranged, which the path of the piston or a movement coupled therewith Part adjustable limited. So if the stop to the setting one to be specified opening path of the wing, such as a door, to adapt to the respective If the situation is adjusted, the position of the signal transmitter is automatically adjusted accordingly Way changed, so that special adjustment measures on the signal transmitter during installation the drive unit is omitted.

In a particularly preferred embodiment of the invention acts the adjustable stop that is accessible and adjustable without opening the housing of the drive unit together with a stop lever which is coupled to a movement with the piston Output shaft, e.g. at the free end thereof, cannot be rotated, preferably adjustable is arranged. The other end of the output shaft is used to drive the wing, in particular a swivel wing of a door or the like.

The control unit is preferably provided with a permanently open switch on the input side and a contactor connected, the permanently open switch for opening and The door is kept open permanently, while the contactor opens it for a short time of the wing causes, for example, when a passerby comes close to each driven Door is coming. The control device switches the pump while simultaneously applying current of the thereby closing solenoid valve when the permanently open switch or the Contactor a permanent one or generate a short-term input signal, As soon as the signal transmitter is assigned to the open end position of the piston, already shortly before this position is reached, an activated signal is generated and a delay time The control device sets when this signal is switched on the pump is shut down when the solenoid valve remains closed.

If now the longer or shorter lasting input signal of the permanently open switch or the contactor ends, the control device switches the solenoid valve after a preferably adjustable hold-open time, about 20 to 30 seconds, de-energized, whereby the solenoid valve opens, so that the piston is released from the closing spring is adjusted while closing the sash. If the signal transmitter is present a signal which indicates that the solenoid valve is energized and thus is closed, no longer emits any signal assigned to the open end position, so the control device switches on the pump, the piston being actuated again of the signal transmitter is moved into its open end position. In doing so, the pump automatically after the delay time has elapsed, measured from the next release of the Open end position associated signal of the signal generator, switched off.

The following is a preferred embodiment of the invention explained with reference to the drawing. 1 shows a schematic representation of the electrohydraulic system of the drive unit, FIG. 2 is an axial view of the Output shaft of the drive unit and arranged on the output shaft with the adjustable stop and the signal transmitter interacting stop lever and FIGS. 3 to 5 are functional diagrams for explaining the control of the drive unit.

The drive unit according to the invention has an electric motor 1 drivable hydraulic pump 2, which on the suction side is connected to a reservoir 3 for hydraulic medium and on the pressure side with the interposition of a check valve 4 with the piston working chamber 5 of a cylinder-piston unit 6 is connected. The piston working space 5 can be emptied into the reservoir 3 via a reflux line 7, which by means of a The solenoid valve is open in the de-energized state, but closed in the energized state 8 is controlled.

In the piston working chamber 5, a piston 9 is arranged displaceably, which of a closing spring 10 in the direction of shown an end position is acted upon, in which a not shown, by means of an output shaft 11 with the piston 9 drivingly coupled wing of a door or the like. its closed position occupies. Serve for the driving coupling of the output shaft 11 to the piston 9 Toothings on the piston 9 and the output shaft 11.

The cylinder-piston unit 6 is on both sides of the piston 9 with hydraulic medium filled, the space 12 on the opposite side of the piston working space 5 of the piston 9 communicates with the reservoir 3 via a connecting line 13.

If pump 2 is closed, i.e. energized When the solenoid valve 8 is put into operation, it moves into the piston working space 5 pushed hydraulic medium the piston 9 from the position shown with a relatively large Speed to the right, the space 12 having two throttled connections 14 and 15 of the connecting line 13 is emptied into the reservoir 3. Once the Piston 9 passes over the connection 14, which is closer in the direction of movement, and blocks, the hydraulic medium can only via the throttled connection 15 get into the connecting line 13 and thus the reservoir 3, so that the Speed of the piston 9 due to increased throttle resistance slowed down and the opening movement of the not shown coupled to the output shaft ii Wing is dampened.

When pump 2 is stopped and the solenoid valve is de-energized, i.e. open 8, the piston 9 closes the wing at a comparatively high speed shifted to the left, the hydraulic medium from the piston working chamber 5 over two throttled connections 16 and 17 in the return line 7 and thus the reservoir 3 is displaced. As soon as the piston 9 closes the connection in this direction of movement 17 runs over and thus blocks, the hydraulic medium can reach the piston working space 5 only left via the throttled connection 16, so that due to the increased Throttle resistance the speed of movement of the piston 9 under simultaneous Damping the closing movement of the driven sash is slowed down.

Have overpressure and check valves 18 and 19 arranged in the piston only safety functions and are closed in normal operation. Over a Line 20 is an annular space 21 between the piston seals with the reservoir 3 connected for sliding lubrication of the piston path.

In particular, however, it is also via this route and the check valve 19 'hydraulic medium is sucked in and the space 12 is filled when the piston 9 is after moved left.

According to FIG. 2, a stop lever is on one end of the output shaft 11 22 non-rotatably arranged, which on a without opening a not shown Housing of the drive unit accessible and adjustable stop 23 rests, when the piston 9 is in its right end position in Fig. 1, i.e. that of the open wing assigned open end position reached; the corresponding position of the stop lever 22 is shown in dashed lines. In the opposite end position of the piston 9 takes the stop lever 22 is in its position shown by a solid line in FIG a.

To adjust the stop 23 is in the support part 24 arcuate slot 25 arranged in the retaining screws 26 or the like. laying down of the carrier part 24 can be used on the drive unit.

A switch 27 serving as a signal transmitter is arranged on the carrier part 24, which of the cam-like end of the stop lever 22 shortly before reaching it the end position limited by the stop 23 is actuated, i.e. the switch 27 generates a signal as long as the piston 9 is close to its open end position and the driven wing is fully or almost fully opened accordingly is.

To control the electric motor 1 and the pump connected to it 2 and the solenoid valve 8 is a not shown control device, which can be connected on the input side with a contactor and a permanently open switch is. The permanently open switch is actuated when the actuated by the drive unit Wing should remain open continuously while the contactor is used to open the wing can only be opened for a short time.

Ultrasonic or radar waves, for example, serve as contactors working motion detectors that detect movements, for example by passers-by or the like., react in the area of the sash or the door.

First of all, the interaction of the control unit is illustrated in FIG explained with the contactor. The time t is plotted on the abscissa.

the ordinate marked state 1 "means in curve 30 that the contactor gives an input signal to the control device, at curve 31 that the motor 1 runs, at curve 32, that a hold-open signal adjustable with respect to its duration is generated, at curve 33, that the same one on the solenoid valve 8 to keep it open Voltage is applied and at curve 34 that the switch 27 is actuated is and emits a signal.

The state "0" corresponds to the respective opposite of the state "1".

As soon as the contactor sends an input signal to the control unit, cf. Curve 30, there, the solenoid valve 8 is blocking the return line 7 below Voltage is set, see curve 33, at the same time the motor 1 is switched on, see FIG. Turn 31.

The input signal generated by the contactor (curve 30) for the control device generally has a different length of time, which for one as Contactor, for example, used motion detector of the duration of the movements corresponds in the "field of view" of the motion detector. With the temporal end of the input signal (Curve 30) the hold-open signal (curve 32) is generated, the duration of which can be pre-selected and is usually between 20 and 30 seconds.

The motor 1 switched on according to curve 31 causes the piston 9 is moved in the direction of its open end position, shortly before reaching the serving as a signal generator Switch 27 is operated. Its signal (Curve 34) has the effect that the motor only has a limited deceleration time, e.g. 1 to 2 seconds, is or remains switched on, which is certainly sufficient that the piston 9 is completely moved into its open end position.

As soon as the hold-open time, see curve 32, has expired, it will Solenoid valve 8 is de-energized, see curve 33, so that the return line 7 is opened and the closing spring 10 the piston in turn with the closure of the wing can move into the closed end position shown in FIG.

As soon as the stop lever 22 moves slightly from the stop 23 (cf. Fig. 2) removed, the switch 27 can no longer be operated, so that its Signal ends, see curve 34.

4 and 5 show the operation when the switch is permanently open again, which in the switched-on state according to curve 35 a long-lasting on the Control unit generates applied input signal. State 1 gives that again Presence of this signal again.

The processing of the signals and thus the functional sequence correspond the representation of FIG. 1. The hold-open signal according to curve 32 is, however, only at the end of the permanently open Switch generated input signal, see curve 35, generated. Thus, the solenoid valve 8 remains under for a correspondingly long time Current and thus closed, see curve 33 in FIG. 4.

4 shows the case that the permanently open switch is only for is set to permanently open for a comparatively short time, about 1 to 2 hours. During this period of time the closing spring can push the piston 9 (cf.Fig. 1) at most move only so slightly that the stop lever 22 hits the switch 27 operated without interruption.

However, if the permanently open switch is on for a much longer period of time Is set permanently open, the leaks in the hydraulic system of the drive unit are sufficient from that the closing spring 10 pushes the piston 9 (see. Fig. 1) a little further from the open end position pushes away, so that (see. Fig. 2) .the stop lever 22 no longer the switch 27 can operate. The corresponding operational sequence is shown in FIG Curves 31 to 35 are to be inserted between the intersection lines V in FIG. As soon the switch 27 is no longer actuated by the stop lever 22 (see FIG. 2) the switch 27 no longer emits a signal, see curve 34 in FIG is so now designed so that when it is present, the closed state of the solenoid valve 8 reproducing signal, see curve 33, and the signal switched off of the switch 27, see curve 34 in FIG. 5, switches on the electric motor 1, see FIG. Curve 31 so that the piston 9 and the wing coupled therewith turn into their Open end position can be brought. So that the stop lever 22 in turn actuates the Switch 27, so that its signal is present again, see curve 34 in FIG the electric motor after the delay time has elapsed, measured from the restart of the signal of the switch 27, see curve 34 in FIG.

The operating sequence described can apply to very long permanently open times repeat several times.

The control device reacts to the operating sequences described above expediently on the pulse edges when switching the input signals on or off of the contactor or the solenoid valve 8 and the signal of the switch 27 (signal generator).

Blank page

Claims (8)

Electro-hydraulic drive unit for leaves of doors or the like. Claims 1. Electro-hydraulic drive unit for leaves of doors or the like. with cylinder-piston unit, the inlet side of which is interposed a non-return device (e.g. non-return valve) to the pressure side of an electrical driven hydraulic pump and on the outlet side with the interposition of an electric controllable, in the currentless state, open solenoid valve to a hydraulic reservoir connected piston working chamber one that is drive-coupled to the wing and acted upon by means of a closing spring in the closing direction of the sash Slidably accommodates piston, which its through when the solenoid valve is closed The hydraulic pump can be switched on and pushed forward against the force of the closing spring. Open end position corresponding to the open position of the sash with the solenoid valve closed and essentially maintains the pump switched off, characterized by one of the Piston (9) or a member (11,22) coupled with it in terms of movement shortly before it is reached the open end position actuatable signal generator (27) and a cooperating therewith Control device which briefly starts the hydraulic pump (2) when the piston (9) with the wing to be kept open from its open end position via its the signal transmitter (switch 27) actuating position also in the sense of a closure of the wing moves. 2. Electro-hydraulic drive unit according to claim 1, characterized in that that the hydraulic pump (2) each for a time interval (delay time), for example for one to two seconds. 3. Electro-hydraulic drive unit according to one of claims 1 and 2, characterized in that the binary signal generator (27) is close to the open end position located piston (9) its one state and in all other positions of the piston assumes its other state. 4. Electro-hydraulic drive unit according to claim 3, characterized in that that an electrical switch (27) is arranged as a signal transmitter, which means an organ (11, 22) which is coupled in terms of movement to the piston (9) and can be actuated mechanically is. 5. Electro-hydraulic drive unit according to one of claims 3 and 4, characterized in that the signal transmitter (27) is against an adjustable stop (23) is arranged, which the path of the piston (9) or a part (11, 22) which is coupled to it in terms of movement is adjustable limited. 6. Electro-hydraulic drive unit according to claim 5, characterized in that that the accessible and adjustable without opening the housing of the drive unit Stop (23) interacts with a stop lever (22) which is connected to the piston (9) coupled Output shaft (11), e.g. a free end thereof, is arranged non-rotatable, preferably adjustable. 7. Electro-hydraulic drive unit according to one of claims 1 to 6, characterized in that with a permanently open switch for opening and keep it open and with a contactor (motion detector or the like.) for Opening and briefly keeping open control device connected on the input side the electric motor (1) of the hydraulic pump (2) with simultaneous application of current of the thereby closing solenoid valve (8) switches on when the permanently open switch or the contactor generates a permanent or short-term input signal (30,35), that the control device, the electric motor (1) and the associated hydraulic pump (2) stops when the solenoid valve (8) is energized and thus remains closed, when the signal transmitter (27) is assigned to the open end position of the piston (9), shortly before this position was reached, a signal that was switched on was generated and a Delay time from the switch-on time of this signal has expired, that the control device the solenoid valve (8) after the end of the permanent or short-term Input signal (30,35) of the permanently open switch or Contactor after a hold-open time (32), for example after 20 to 30 seconds, de-energizes and thus opens and that the control device when the Matnet valve (curve 33) is energized, the electric motor (1) of the hydraulic pump (2) switches on when the signal transmitter (27) does not have a signal assigned to the open end position (34) releases, the hydraulic pump (2) after releasing the the open end position assigned signal (34) again after the expiry of the time when this signal is switched on starting delay time is switched off. 8. Electro-hydraulic drive unit according to one of claims 1 to 7, characterized in that in a reservoir (3) for hydraulic medium Drive unit a gas-filled bladder, for example made of rubber or plastic, is arranged to compensate for volume levels of the hydraulic medium.