DE10261224B3 - Electrohydraulic door operating drive with open holding function provided by hydraulically-controlled valve with 2/2-way valve and non-return valve - Google Patents

Abstract

The door operating drive has a hydraulically-controlled valve (20) incorporated in the hydraulic circuit for providing the open holding function and provided by a 2/2-way valve with a control piston (22) and a non-return valve (23). The effective piston surface of the control piston is greater than the sealing surface of the 2/2-way valve, so that the control pressure in the open holding valve is less than the pressure in the piston space (1) of the door operating drive.

Description

The invention relates to an electrohydraulic Swing Door Operator with a hold-open function, with the execution of the hold-open function a hydraulically controlled hold-open valve in the hydraulic circuit is arranged.

Such a swing door drive is from the DE 44 23 989 A1 known. A disadvantage of this construction, however, is that it is kept open permanently against the force of the swing door drive, which places a heavy load on the motor.

It is therefore the task of the present Invention to switch an electrohydraulic swing door drive in which while keeping the electrohydraulic drive open gently or only under low load can be operated.

This object is achieved in the claim 1 specified features solved. Advantageous further developments result from the subclaims.

Due to the configuration of the Hydraulically controlled hold-open valves can permanently open the door be kept open, since only a low control pressure is required, the z. B. from a motor pump unit over a very long period of time, without the risk of overheating, and with minimal brush burn-up can be maintained. In addition, as a result of embodiment according to the invention the advantage that the swing door drive according to the invention when switched off Motor works unaffected by the hydraulic drive, so that no additional Switch valve is required. The fact that he inventive hold-open valve a 2-2-way valve, with a control piston and a check valve has backflow the hydraulic fluid be prevented from the piston space into a tank space. The 2-2-way valve is like this constructed that with a relatively low control pressure a multiple greater pressure in the piston chamber of the swing door drive can be held. In this way, the door against the spring force of the Swing door drive be kept permanently open, whereby the motor is only lightly loaded becomes. The control piston is compared to the delivery pressure controlled lower pump pressure, which results in a size control surface compared to the sealing surface of the 2-2-way valve is available. The check valve turns a hydraulic Separation of piston chamber and pump reached, so that a backflow the hydraulic fluid out of the piston chamber the check valve is prevented. This is required to use the 2-2-way valve To control the pump pressure. If the delivery pressure of the pump is lower than the pressure in the piston chamber, both areas are hydraulic separated from each other so that the 2-2-way valve using the pump can be controlled. According to the configuration according to the invention is the pressure in the piston chamber of the swing door operator several times larger than the control pressure in the hold-open valve. In this way, one with the swing door drive according to the invention provided door against the spring force of a spring contained in the rotary leaf drive be kept permanently open.

Preferably in the hydraulic circuit one as a DC motor, as an electronically commutated motor or trained as a speed controllable AC or three-phase motor Motor provided that drives a pump, because only with such motors the engine torque and the engine speed can be changed and a continuous open function with low power losses can be.

The inflow is preferably and the backflow of the hydraulic circuit separately. This reduces the number of valves required, but requires one additional hydraulic line.

In the control piston of the hold-open valve preferably a check valve integrated. According to an alternative embodiment, the check valve also be provided in a bypass to the hold-open valve.

According to an advantageous development it is provided that in the hydraulic circuit for damping the opening and / or the closing movement Throttle valves are provided.

The hold-open valve according to the invention is preferably about controlled the pressure of the pump.

Further refinements of the invention result from the following description of preferred exemplary embodiments.

Show it:

1 : A first embodiment of the swing door drive according to the invention,

2 : a second embodiment of the swing door drive according to the invention,

3 1 shows a first embodiment of a hold-open valve used in the swing door drive according to the invention,

4 : a second embodiment of the hold-open valve according to

3 .

5 : a third embodiment of the hold-open valve according to 3 .

6 : a fourth embodiment of the hold-open valve after 3 .

7 : a fifth embodiment of the Of holding valves 3 but with an additional bypass valve,

8th : a sixth embodiment of the hold-open valve according to 3 , but with an additional bypass valve.

In 1 A swing door drive according to the invention is shown according to a first embodiment. In this embodiment, the closing movement of the swing door drive is controlled via throttle valves.

The swing door drive has a piston chamber 1 on in which a piston 2 against the force of a spring 3 is movable. The piston 2 is with a toothing 4 provided with a pinion 5 combs, which cooperates with a locking mechanism, not shown, for a door, a window or the like. The gearing 4 is in the illustrated embodiment inside the piston 2 educated. As a result of movement of the piston 2 is about the gearing 4 the pinion 5 rotated.

The drive of the piston 2 takes place via a hydraulic circuit, which is connected to the piston chamber via hydraulic lines 1 connected. There is a pump in the hydraulic circuit 6 provided by an engine 7 is driven. The motor 7 is preferably designed as a direct current motor or as a speed-controllable alternating or three-phase motor, since motor torque and motor speed can be varied in a simple manner in these motor types and a continuous open function can be implemented with low power losses.

The piston 2 is with sealing washers at both ends 10 and 11 provided which sealing on an inner wall of the piston chamber 1 issue. In the sealing washers 10 and 11 are pressure relief valves to avoid destructive overpressures 12 and 13 brought in. Here is the pressure relief valve 13 only in combination with hydraulic opening damping through a throttle valve 18 necessary, otherwise in this area of the piston chamber 1 no critical overpressures can occur. It is also located in the sealing washer 10 a check valve 15 , which enables the door to be opened manually even when the drive is switched off. A check valve 14 leaves the hydraulic fluid with low loss on throttle valves when the door is opened automatically 17 over into the piston chamber 1 stream. Like the valves 12 to 18 are arranged in detail, the 1 be removed.

Thereby are in the sealing washer 10 the check valve 15 and the pressure relief valve 12 , Here is the pressure relief valve 12 spring-loaded. Furthermore, the valves 12 and 15 used anti-parallel. The same number and type of valves 13 and 16 is also in the sealing washer 11 existing, only these valves are installed in the same direction, so that an overpressure from the spring chamber into the piston 2 can escape.

• – einem 2-2-Wegeventil, welches einen Rückfluss der Hydraulikflüssigkeit vom Kolbenraum 1 in einen im Hydraulikkreislauf vorhandenen Tankraum 8 verhindert,
• – einem Steuerkolben 22, der zur Steuerung des 2-2-Wegeventiles durch einen im Vergleich zum Förderdruck der Pumpe 6 niedrigen Pumpendruck dient und
• – einem Rückschlagventil 23, welches eine hydraulische Trennung von Kolbenraum 1 und Pumpe 6 bewirkt.

There is also a hydraulically controlled hold-open valve in the hydraulic circuit 20 provided that consists of three components:

• - A 2-2-way valve, which allows the hydraulic fluid to flow back from the piston chamber 1 into a tank room in the hydraulic circuit 8th prevented
• - a control piston 22 which is used to control the 2-2-way valve by means of a compared to the delivery pressure of the pump 6 serves low pump pressure and
• - a check valve 23 , which is a hydraulic separation of the piston chamber 1 and pump 6 causes.

The 2-2-way valve is designed so that with a relatively small control pressure on the control piston 22 a pressure several times greater in the piston chamber 1 the swing door drive can be kept and the backflow of hydraulic fluid into the tank compartment 8th is prevented, so that the door, window or the like can be kept permanently open, the motor 7 is only weakly loaded. So if the delivery pressure of the pump 6 is less than the pressure in the piston chamber 1 , both areas are hydraulically separated from each other, so that with the help of the pump 6 now the 2-2-way valve through the control piston 22 can be controlled.

In order to achieve a clear position of the 2-2-way valve or a floating state, in which both the check valve 23 and the 2-2-way valve are not fully closed, either the check valve should be avoided 23 or the 2-2-way valve or both with a weak spring force by at least one spring element 26 or 27 be burdened.

The throttle valves are still in the hydraulic circuit 17 and 18 provided that serve to control the opening and closing movement and their exact arrangement of the 1 can be removed. Also the exact routing and connection of hydraulic lines 41 to 46 of the hydraulic circuit are the 1 refer to. The hydraulic lines 43 and 45 over the piston 2 controlled.

The tank room 8th z. B. formed by a hydraulic accumulator, which even with a small change in volume of the hydraulic fluid, such as can arise from temperature changes, an approximately constant low pressure on the suction side of the pump 6 causes a shaft seal on the pump to be permanently relieved. This compensation accumulator can be formed, for example, by a gas bladder, a gas bladder accumulator with an elastic membrane or bladder, a piston accumulator with or without a spring or the like.

In the 2 is a second embodiment of the swing door drive according to the invention ge shows. This embodiment differs from that in FIG 1 shown that the inflow is separated from the return flow. This has the advantage that the check valve has the same function 14 out 1 is no longer required, instead is a hydraulic line 47 required. Because with the in 2 shown drive is dispensed with a hydraulic opening damper, can also the pressure relief valve 13 out 1 omitted and through a connecting line 48 be replaced. This shows how the construction of the hydraulic lines and the arrangement of the various valves must be done 2 ,

It is located in the sealing washer 11 no check valve anymore, rather is a direct connection 48 from the piston chamber 1 to the inside of the piston 2 available. There is also a check valve 15 and a pressure relief valve 12 in the sealing washer 10 installed, which are connected anti-parallel.

In 3 is a first embodiment of the hold-open valve 20 shown. The 2-2-way valve 21 is on the in 3 left through the hydraulic line 41 with the pump 6 and on the in 3 right side through the hydraulic line 42 with the piston chamber 1 connected. An upward hydraulic line 46 leads to the tank room 8th , The control piston 22 is with a through hole 49 provided, which consists of two areas with different diameters. On the to the piston chamber 1 leading side is the diameter of the through hole 49 smaller than that on the pump 6 leading side. In the larger area of the through hole 49 is the check valve 23 arranged that in the control piston 22 is integrated.

It is also between the spool 22 and the one to the pump 6 leading side (hydraulic line 41 ) the spring element 27 arranged, which the control piston 22 to the right in 3 towards the connection of the hydraulic line 42 to the piston chamber 1 urges and in this position the hydraulic line 42 to the hydraulic line 46 closes. The check valve opens at a certain pressure 23 and the hydraulic medium can come from the hydraulic line 41 through the through hole 49 in the hydraulic bore 42 stream. The control piston 22 can by a circumferential seal 24 or sealed by an appropriate sealing fit.

In the 4 is a second alternative embodiment of the hold-open valve 20 shown. The connections 41 and 42 are the same as related to 3 explained. The difference to the embodiment according to 3 is that the check valve 23 with the spring element 26 not in the control piston 22 is integrated, but in a bypass 50 is arranged, the connection of the hydraulic line 42 to the piston chamber 1 with the hydraulic line 41 to the pump 6 combines. Inside the control piston 22 there is no through hole. Furthermore, in the alternative embodiment in 4 the closing function of the 2-2-way valve function by a separate closing body 9 realized in the form of a sphere. This has the advantage that the closing body 9 within a conical depression 53 self centered and positional tolerances between the spool 22 and the valve seat are balanced. The control piston 22 is also due to the spring element 27 towards the closing body 9 biased.

In the 5 is a third alternative embodiment of the hold-open valve 20 shown, in contrast to the embodiments according to 3 and 4 , the inflow to the piston chamber 1 through the hydraulic line 42 and the bypass 50 and the return of the hydraulic fluid separately through the hydraulic line 47 he follows.

In the 6 is a fourth alternative embodiment of the hold-open valve 20 shown, in which, in contrast to the above-described embodiments, the 2-2-way valve is designed as a slide valve. The closing body of the 2-2-way valve is formed by a cylindrical body, which is the hydraulic line 46 locks or releases depending on the switching position. The hydraulic line 46 on the one hand ends again in the space of the control piston 22 and at the same time in one of the hydraulic lines 42 upstream space 52 in which there is a piston 51 located. The piston 51 is free-floating and much smaller in diameter than the control piston 22 ,

In the 7 is a fifth alternative embodiment of the hold-open valve 20 shown with an adjustable valve 28 between hydraulic line 41 and 46 is arranged to faster pressure equalization on the control piston when the drive is switched off 22 to achieve and thereby the switching speed of the 2-2-way valve 21 to increase and. at the same time by suitable adjustment of a valve 28 limit the additional leakage that occurs during operation to an acceptable level.

In the 8th is a sixth alternative embodiment of the hold-open valve 20 shown, in contrast to the embodiment according to

7 the valve 28 is designed so that with increasing pressure in the hydraulic line 41 the additional on the valve 28 occurring leakage flow is reduced or can be completely avoided when the operating pressure is reached. A throttle body is supported for this 29 of the throttle valve 28 on a spring 31 so that when the pressure in the hydraulic line rises 41 the gap of the valve seat to the throttle body 29 is reduced or closed entirely. In this way, a short switching time of the 2-2-way valve can be achieved without having to accept an additional leakage current. The throttle body 29 stands with a setting pen 30 with a spring 32 is equipped, in operative connection.

The following is the function of the swing door drive according to the invention When opening, Keep open and close the door explained.

When the door is opened, the pump generates 6 a volume flow of hydraulic fluid flowing into the piston chamber 1 is promoted. The pump must do this 6 because of the inertia of the door and the force of the spring 3 on the piston 2 apply a correspondingly increased pressure. This increased pressure closes through the control piston 22 the 2-2-way valve and thereby prevents the pumped liquid volume from flowing out into the tank compartment 8th ,

To keep the door open, the pump pressure is reduced. Through the check valve 23 of the hydraulically controlled hold-open valve 20 becomes the pressure in the piston chamber 1 maintained and flowing back into the pump 6 prevented. The 2-2-way valve is activated by a small control pressure from the pump 6 still kept closed.

To close the door, the unit is made up of a pump 6 and engine 7 completely switched off. This also happens in the event of a power failure. This causes the pressure to drop due to leakage in the pump 6 or on the control piston 22 or on the additional valve 28 below a limit at which the 2-2-way valve opens so that the hydraulic fluid through the throttle valves 17 in the tank room 8th can drain off.

1

piston chamber

2

piston

3

feather

4

gearing

5

pinion

6

pump

7

engine

8th

tankage

9

closing body

10

sealing washer

11

sealing washer

12

Pressure relief valve

13

Pressure relief valve

14

check valve

15

check valve

16

check valve

17

throttle valve

18

throttle valve

20

Hold open valve

22

spool

23

check valve

24

seal

26

spring element

27

spring element

28

Valve

29

throttle body

30

adjusting pin

31

feather

32

feather

41

hydraulic line

42

hydraulic line

43

hydraulic line

44

hydraulic line

45

hydraulic line

46

hydraulic line

47

hydraulic line

48

connecting line

49

Through Hole

50

bypass

51

piston

52

room

53

conical deepening

Claims (13)

Electro-hydraulic swing door drive with a hold-open function, a hydraulically controlled hold-open valve being arranged in the hydraulic circuit for performing the hold-open function, characterized in that - the hold-open valve ( 20 ) a 2-2-way valve with a control spool ( 22 ) and a check valve ( 23 ), and - that an effective piston surface of the control piston ( 22 ) is larger than the sealing surface of the 2-2-way valve, so that the control pressure in the hold-open valve ( 20 ) is less than the pressure in the piston chamber ( 1 ) of the swing door drive. Electro-hydraulic swing door drive according to claim 1, characterized characterized in that the 2-2-way valve is designed as a lockable check valve is. Electro-hydraulic swing door drive according to claim 1, characterized characterized in that the 2-2-way valve is designed as a slide valve. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that either the check valve ( 23 ) or the control piston ( 22 ) of the hold-open valve ( 20 ) or both with one or more spring elements ( 26 . 27 ) are burdened. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that in the hydraulic circuit a motor designed as a DC motor, as an electronically commu tated motor or as a speed-controllable AC or three-phase motor ( 7 ) is provided, which is a pump ( 6 ) drives. Electro-hydraulic swing door drive according to one of the preceding Expectations, characterized in that the inflow and the backflow of the hydraulic circuit are separated from each other. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that in the control piston ( 22 ) of the hold-open valve ( 20 ) the check valve ( 23 ) is integrated. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that the check valve ( 23 ) in a bypass ( 50 ) is provided for the 2-2-way valve. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that in the hydraulic circuit for controlling the opening and / or closing movement, throttle valves ( 17 and 18 ) are provided. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that the hold-open valve ( 20 ) about the pressure of the pump ( 7 ) is switchable and / or controllable. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that parallel to the hold-open valve ( 20 ) a valve ( 28 ) is arranged in such a way that the leakage current on the control piston can be regulated in a targeted manner in order to adjust the switching speed of the hold-open valve 20 ) to control. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that the valve ( 28 ) one on a spring ( 31 ) acting closing body ( 29 ) so that the valve ( 28 ) closes depending on the pressure and thereby reduces the leakage current that occurs during opening. Electro-hydraulic swing door drive according to one of the preceding claims, characterized in that between a hydraulic line ( 41 ) from the pump ( 6 ) and a hydraulic line ( 46 ) leading to the tank room ( 8th ) leads a valve ( 28 ) is available.