EP2186982B1 - Door actuator - Google Patents

Description

The invention relates to a door operator for opening and / or closing a door with a closer shaft which can be coupled to the door, with at least one piston, which is in operative connection with the closer shaft and is movable within a housing, at least a first and a second pressure chamber , which are separated by the piston and filled with a damping medium, a channel arrangement, within which the damping medium between the first and the second pressure chamber in response to the movement of the piston is flowable, a throttle valve which is provided within the channel assembly to the To dampen movement of the piston, and at least one filter that protects the throttle valve from any contamination.

A generic door operator is in the DE 20 2008 005 721 U1 described. It has disadvantageously been shown that the damping medium, in particular a hydraulic oil, can contaminate. This contamination can be caused for example by abrasion on the running surfaces of the piston. This contamination can be deposited on the throttle valve, in particular at the throttle gap, whereby the degree of damping as well as the closing speed of the door can be changed in an uncontrollable manner.

In the DE 19 33 213 a door actuator is disclosed in which a filter device is provided within the housing between the piston and the channel in which the throttle valve is arranged. In practice, it has been found that in terms of compactness of a door operator, there is room for improvement, while ensuring the operation.

The object of the present invention is to develop a door operator of the type mentioned, whereby a more compact overall arrangement of the door operator is achieved and at the same time the functionality, in particular a reliable filtering is ensured.

To solve this problem, a door operator with the features of claim 1 is proposed. In the dependent claims preferred developments are carried out.

For this purpose, the invention provides that the filter and the housing form a common fluid channel, through which the damping medium can be flowed in the direction of the throttle valve. This means that a common fluid channel is created solely by the installation of the filter within the housing, which is located between the channel arrangement, in particular the throttle valve and the first or the second pressure chamber. Thus, the structure of the filter can be kept relatively simple, at the same time the assembly cost for the arrangement of the filter within the first or the second pressure chamber is low. The fluid channel is advantageously located directly on the channel arrangement, so that the flow path between the filter and the throttle valve can be kept low. Advantageously, the piston is spaced from the filter when the door is in an open position. During the closing movement takes place via a rotational movement of the closer shaft, a displacement of the piston in the direction of the filter, at the same time within the first pressure chamber located damping medium, in particular hydraulic oil, is passed through the filter. The filter has a construction such that the displaced damping medium is forced in the fluid passage and directed to the throttle valve. The displaced damping medium enters the channel arrangement to the throttle valve and is then transported through the channel arrangement in the second pressure chamber. Any dirt particles within the damping medium can be effective for the throttle valve be kept away, so that the desired damping for the closing movement of the door is always guaranteed. The throttle valve may be adjustable from the outside to adjust the flow rate of the damping medium within the channel assembly can. The door operator according to the invention can be related both to a door closer or a door opener, which has for example a door drive, in particular an electro-hydraulic motor unit.

An inventive measure provides that the filter rests against the housing, wherein the circumferential fluid channel is present between the housing and the filter surface. Expediently, the filter has an inner space which is open to the first or second pressure chamber and is separated from the circulating fluid channel by the filter surface. The interior serves as a cavity into which further components of the door operator can be installed, whereby a compact overall arrangement can be created. Thus, it may be appropriate that the interior of essential components, such as valve, piston, piston rod or spring element can be used.

In a further alternative of the invention can be provided that the filter is arranged in the first pressure chamber such that the filter is at least partially within the stroke range of the piston. Advantageously, the piston can retract and immerse during its movement within the housing in the filter, whereby the space of the overall arrangement of the door operator can be kept low, in particular further space for additional elements can be created. In this case, advantageously, the free end of the piston, which faces the filter, a smaller diameter than the diameter of the interior of the filter. In the open position of the door may be a distance between the free end of the piston and the filter, wherein in a closed position of the door, the free end of the piston is within the interior of the filter of the first pressure chamber.

It is also conceivable that the filter is arranged in the first pressure chamber such that the filter is outside the stroke range of the piston. This means that in an open position of the door, the free end of the piston has a distance from the filter, wherein in a closed position of the door, the free end of the piston always has a distance from the filter, but which is less than the distance that the piston to Filter has in the open position of the door.

It is also conceivable to arrange an additional filter in the second pressure chamber. The damping medium, which flows from the first pressure chamber through the channel arrangement during the closing operation of the door, passes into the filter arranged in the second pressure chamber. In practice, it has been shown that the damping medium can flow back from the second pressure chamber into the first pressure chamber with a small amount through the channel arrangement during the opening process of the door. Thus, it is also effectively prevented for this case that the arranged within the channel arrangement throttle valve can pollute any.

In one possible embodiment of the invention, the filter has a filter surface which circumferentially faces the housing, in particular the housing inner wall. Advantageously, in this case the filter surface is designed like a ring, which is fixed circumferentially on the housing. The housing here represents the cylinder chamber, within which the piston can be moved. In addition to the ideal use of space of the filter within the first and / or the second pressure chamber, a large total filter surface is created due to the ring-like design of the filter surface, which does not clog up even after prolonged periods of operation of the door operator with dirt particles.

In an advantageous embodiment of the invention, the circumferential filter surface of the first pressure chamber is aligned parallel to the direction of movement of the piston. The annular filter surface may in this case be circular, oval, square, rectangular or the like, wherein the geometric shape of the filter surface is adapted according to the geometry of the housing inner wall.

The filter is arranged in the first and / or in the second pressure chamber such that during the movement of the piston, a deflection of the flow direction, the damping medium takes place both in the interior of the filter and in the circumferential channel. This means that the damping medium, which is displaced by the moving piston, is pressed into the filter of the first pressure chamber and is deflected there radially outward, in a star shape to the circulating filter surface. Subsequently, the damping medium passes through the filter surface in the circumferential fluid channel, within which the damping medium in turn undergoes a deflection in the direct direction along the limiting walls to the throttle valve. From the throttle valve, the damping medium is again guided via the channel arrangement in the second pressure chamber. Thus, a deflection of the flow direction of the damping medium takes place both before filtering and after filtering.

If a flow of the damping medium from the second pressure chamber into the first pressure chamber, deflections of the flow direction of the damping medium in the additionally arranged filter of the second pressure chamber are analogous to the just described flow deflections within the filter of the first pressure chamber, but in reverse order.

In a possible embodiment of the invention, a closure element is attached to the housing, which closes the first pressure chamber to the environment, wherein the filter is rotatably arranged on the closure element is. The closure element can be, for example, a closure plug or a closure screw. It has been shown that the assembly effort can be reduced by integrating the filter on the closure element. Furthermore, the freely rotatably arranged on the closure element filter favors that during assembly of the closure element to the housing virtually no abrasion of the contact surface of the filter with the housing is formed.

Appropriately, the screw plug is screwed through a thread on the housing of the door operator, whereby the first pressure chamber is effectively closed from the environment. During the attachment of the screw plug, the filter does not rotate with the screw plug, since the filter already with its contact surface reliably against the inside of the housing positive and / or non-positively.

Advantageously, the filter surface is designed as a fabric or a fleece. The filter surface as well as the entire filter can also be designed as a sintered filter. By such a material selection of the filter surface reliable operation of the door operator can be ensured even for long periods of operation.

In a further alternative of the door operator according to the invention, the channel arrangement has a throttle channel which extends between the first and the second pressure chamber. Within the throttle channel, a throttle valve is arranged. The first part of the throttle passage extends between the circumferential fluid passage of the filter and the throttle valve. The second part of the throttle channel extends from the throttle valve to the second pressure chamber. Furthermore, it is conceivable that the filter has a plurality of circumferential channels, which are separated by a filter arranged on the sealing element, wherein at the same time the channel arrangement has a plurality of throttle valves and throttle channels, each circulating fluid channel, a throttle channel individually assigned. If multiple throttle valves are used in the door operator, these throttle valves can be effectively protected from contamination by only a common filter with different circumferential channels and filter surfaces that can be arranged parallel to each other.

The channel arrangement can run in the housing and / or in the piston. In one possible embodiment of the invention flows during the movement of the piston in the direction of the filter (closing the door), the damping medium from the first pressure chamber through the filter surface in the channel assembly, in particular in the throttle channel to the throttle valve. Subsequently, the displaced damping medium enters a further throttle channel, which opens into the second pressure chamber which is separated from the first pressure chamber by the piston. In contrast, during the opening operation of the door, a movement of the piston takes place in the direction of the second pressure chamber, at the same time the piston is removed from the filter of the first pressure chamber and thus the first pressure chamber increases in volume. At the same time flows from the second pressure chamber via a channel arrangement, which advantageously extends within the piston, the damping medium in the first pressure chamber.

In a preferred embodiment, the piston is integrated in a piston system having a first and a second piston which are movable within the housing in response to the closer shaft. In this case, the first piston separates the first pressure chamber from the second pressure chamber and the second piston separates the second pressure chamber from a third pressure chamber, the pressure chambers being connected to one another via the channel arrangement. The third pressure chamber may additionally be provided with a filter which corresponds to the filter according to the first or second pressure chamber.

A further advantageous embodiment can be achieved in that the door operator is arranged in a door frame or in a door leaf, door leaf, etc. This results in an invisible solution for the user, which fits into any design of a possible interior design.

According to an advantageous development, the closer shaft of the door operator can be in operative connection with a door frame or a door leaf, for example via a slide rail linkage or a scissors linkage. About the linkage of Schließmomentenverlauf the transmission in dependence on the mounting, z. B. on the tape or Gegenbandseite be influenced.

Further advantages, features and details of the invention will become apparent from the following description in which several embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination.

Figur 1:

eine Teilansicht eines Türbetätigers, bei dem die Tür sich in einer offenen Stellung befindet,

Figur 2:

der Türbetätiger gemäß Figur 1, bei dem sich die Tür in einer geschlossenen Stellung befindet,

Figur 3:

ein weiteres Ausführungsbeispiel eines Türbetätigers, bei dem sich die Tür in einer geschlossenen Stellung befindet,

Figur 4:

ein weiteres Ausführungsbeispiel eines Türbetätigers gemäß Figur 3,

Figur 5:

eine weitere Alternative des Türbetätigers gemäß Fig. 1,

Figur 6:

eine dreidimensionale Ansicht des Filters, der innerhalb des Türbetätigers gemäß Figur 1 bis Figur 5 angeordnet ist, und

Figur 7:

eine Schnittansicht gemäß VII-VII aus Figur 1.

Show it:

FIG. 1:

a partial view of a door operator, wherein the door is in an open position,

FIG. 2:

the door operator according to FIG. 1 in which the door is in a closed position,

FIG. 3:

another embodiment of a door operator, wherein the door is in a closed position,

FIG. 4:

a further embodiment of a door operator according to FIG. 3 .

FIG. 5:

another alternative of the door operator according to Fig. 1 .

FIG. 6:

a three-dimensional view of the filter, the inside of the door operator according to FIG. 1 to FIG. 5 is arranged, and

FIG. 7:

a sectional view according to VII-VII from FIG. 1 ,

In FIG. 1 and FIG. 2 a possible alternative embodiment of a door operator 1 is shown. The door operator 1 has a piston 11 which is linearly movable within a housing 3 along an axis 7. This piston 11 is in operative connection with a closer shaft, not shown, which is rotatable about the axis 6. This shutter shaft is in the embodiments according to FIG. 3 and FIG. 4 shown in detail. The piston 11 in this case separates a first 21 and a second pressure chamber 22, which are both filled with a damping medium 4, a hydraulic oil.

The door operator 1 further has a channel arrangement 30, within which the damping medium 4 between the first and the second pressure chamber 21, 22 in response to the movement of the piston 11 can flow. On the one hand, a throttle channel 32 is formed in the housing 3, which connects the first 21 and the second pressure chamber 22 with each other. Within the throttle channel 32, a throttle valve 31 is arranged. Furthermore, a further channel 33a extends through the piston 11, wherein the channel 33 also connects the first pressure chamber 21 with the second pressure chamber 22. Within the channel 33a is a check valve 34th

Furthermore, a closure element 5 is fixed to the housing 3, which closes the first pressure chamber 21 to the environment. Within the first pressure chamber 21, a filter 40a is arranged, which protects the throttle valve 31 from any contamination. The filter 40a is provided with a circumferential filter surface 41, which extends at a distance from the housing inner wall 3a. Another filter can also be arranged in the second pressure chamber 22, which explicitly only in the exemplary embodiments according to FIG FIG. 3 and FIG. 4 is indicated. The filter 40b off FIG. 3 and FIG. 4 substantially corresponds to the filter 40a, which according to the embodiment of FIG. 1, FIG. 2 and FIG. 5 is disposed within the first pressure chamber 21.

In all embodiments according to FIG. 1 to FIG. 5 the filter surface 41 is designed like a ring, which means that the filter surface 41 has a lateral surface which serves to filter the damping medium 4. As can be seen, the filter 40a, 40b is applied to the housing 3, in particular to the housing inner wall 3a, wherein a circumferential fluid channel 42 is present between the housing 3 and the filter surface 41. As well as special FIG. 6 illustrates, the circumferential fluid passage 42 is simultaneously bounded by two spaced, annular contact surfaces 44 on both sides. These contact surfaces 44 are also part of the filter 40a, 40b. In addition, the filter 40 a, 40 b has an inner space 43, which is open to the first 21 and the second pressure chamber 22. The filter surface 41 in this case separates the interior 43 of the filter 40a, 40b from the circulating fluid channel 42. In the embodiments shown, the filter surface 41 is designed as a fabric with a specific passage for the damping medium 4. It is also conceivable to design the filter surface 41 with a fleece or other type of material, which is suitable to effectively filter the damping medium 4 from any contamination. The contact surfaces 44 are interconnected by webs 47.

As in FIG. 1 and FIG. 2 can be seen, the throttle passage 32 extends from the circumferential fluid passage 42 to the second pressure chamber 22. The filter 40a is connected via a fastening element 8, here a screw 8, with the closure element 5, here a locking screw 5, respectively. During assembly, the screw plug 5 is inserted into the housing 3 and secured by a thread on the housing 3. The filter 40 a is rotatably arranged on the screw plug 5, so that during the attachment of the screw plug 5 on the housing 3, the contact surfaces 44 of the filter 40 a rest against the housing inner wall 3 a and do not rotate with the screw plug 5. This prevents that an unnecessary abrasion of the contact surfaces 44 during assembly of the screw plug 5 is formed.

Starting from FIG. 1 , in which the door, not shown, is in an open position, a movement of the door in the closed position via a movement of the closer shaft, not shown about its axis 6, wherein a certain force flow acts on the piston 11, thus in the direction of the filter 40 a is moved along the housing inner wall 3a of the housing 3. While the piston 11 is displaced linearly along the axis 7 on the housing inner wall 3a of the housing 3 to the screw plug 5, there is a displacement of the damping medium 4 located within the first pressure chamber 21. During the movement of the piston 11, the damping medium 4 flows into the interior space 43 , where it is deflected radially outward or star-shaped in the direction of the filter surface 41. After the passage of the damping medium 4 through the filter surface 41, a new deflection of the damping medium 4 in the direction of the throttle valve 31 takes place in the Fliudkanal 42. The damping medium 4 flows in a circular manner about the axis 7 within the Fliudkanals 42nd

The damping medium 4 flows into the throttle channel 32, through the throttle valve 31 and passes through the further throttle channel 32 in the second Pressure chamber 22. About the throttle valve 31, the movement of the piston 11 and the closing speed of the door is effectively damped. Any contamination within the damping medium 4 remain in the filter surface 41 and thus can not interfere with the operation of the throttle valve 31.

The free end 11 a of the piston 11, which faces the filter 40 a, has a smaller diameter than the diameter of the interior 43 of the filter 40 a. Thus, the piston 11 according to the embodiment in FIG. 2 move with its free end 11a in the interior 43 of the filter 40a. During the movement of the piston 11, starting from FIG. 1 in the position according to FIG. 2 prevents the check valve 34 within the piston 11 that passes through the channel 33a, the damping medium 4 from the first pressure chamber 21 into the second pressure chamber 22.

It is also conceivable that the stroke movement of the piston 11 ends in front of the filter 40 a, that means that the piston 11 does not enter into the interior 43, which in FIG. 5 is shown. In the extended position, the piston 11 is shown in dashed lines. In this embodiment, the piston 11 has a spring element 18. In the closed position of the door (see FIG. 5 ) acts on the piston 11, the spring element 18 which moves the piston 11 in the direction of the closer shaft 2 with a movement of the door in its open position. Thus, a force is exerted on the piston 11 via the spring element 18 in order to reliably move it again in the direction of the second pressure chamber 22. Of course, such an arrangement of the spring element 18 in the embodiment according to FIG. 1 and FIG. 2 applicable.

In FIG. 3 and FIG. 4 in each case a further embodiment variant of a door actuator 1 is shown, wherein the piston 11 is integrated in a piston system 10 having a first 11 and a second piston 12. Both pistons 11, 12 are linearly displaceable within the housing 3 along the housing inner wall 3 a along the axis 7. The first piston 11 separates the first pressure chamber 21 from the second pressure chamber 22. The second piston 12 separates the second pressure chamber 22 from the third pressure chamber 23. All pressure chambers 21, 22, 23 are connected to one another via the channel arrangement 30. Within the pressure chambers 21, 22, 23 is the damping medium 4. As in FIG. 3 and in FIG. 4 can be seen, the door operator 1 on a closer shaft 2, which can be coupled with a door, not shown. The closer shaft 2 is rotatably supported about the axis 6 and connected rotationally fixed to a power transmission element 13. The force transmission element 13 is in contact with the second piston 12, in particular with a first roller 14, which is rotatably mounted in the second piston 12. The second piston 12 is in operative connection with a within the third pressure chamber 23 located spring element 15, which is a compression spring 15 in the present embodiment. The force transmission element 13 is further in contact with the first piston 11, in particular with a second roller 16 which is rotatably mounted in the first piston 11.

The in FIG. 3 and FIG. 4 shown door operator 1 is in a position in which the door, not shown, is in a closed position. If the door moves into the open position, the closer shaft 2 moves about its axis 6, with the force transmission element 13 likewise being moved about the axis 6. The power transmission element 13 is designed as a Hubkurvenelement 13, wherein the closer shaft 2 and the Hubkurvenelement 13 have a common axis of rotation 6 and the Hubkurvenelement 13 is arranged eccentrically on the axis of rotation 6. Here, the Hubkurvenelement 13 on its outer contour on a curved path having different distances from the axis 6. This means that the Hubkurvenelement 13 is a kind of eccentric, which is in contact with both the first and the second piston 11, 12. Now moves the Hubkurvenelement 13 about the axis 6, the spring element 15 pushes the second piston 12 in the direction of closer shaft 2. At the same time, the first piston 11, driven by the lifting cam element 13, moves in the direction of the screw plug 5. The arrangement of the screw plug 5 including the filter 40a and its technical features corresponds to FIG Essentially the embodiments according to the embodiment in FIG. 1 and FIG. 2 , According to the description FIG. 1 and FIG. 2 is also in the embodiments according to FIG. 3 and FIG. 4 the damping medium is "filtered" through the filter 40a via the annular filter surface 41 and enters the throttle channel 32, where it flows in the direction of the throttle valve 31 and then flows back into the second pressure chamber 22 via a further throttle channel 32. As well as in FIG. 1 and FIG. 2 is shown, the first piston 11 has a channel 33a with a check valve 34, through which the damping medium 4 only flows when the first piston 11 is moved in the direction of the second pressure chamber 22 and thus the first pressure chamber 21, the damping medium 4 from the second Suction chamber 22 sucks. Furthermore, the second pressure chamber 22 is connected to the third pressure chamber 23 via a channel 33b within which a filter element is optionally located and which extends through the second piston 12.

As in FIG. 3 and FIG. 4 is shown, a further filter 40b is additionally arranged in the second pressure chamber 22. In this case, the closer shaft 2 extends through the filter 40b. While the damping medium 4 flows through the throttle channel 32 in the direction of the second pressure chamber 22, it passes into the filter 40b. In this case, the damping medium 4 initially flows into the circulating fluid channel 42 of the filter 40b, passes through the filter surface 41 and enters the interior 43 of the filter 40b, where it finally enters the second pressure chamber 22. If the first piston 11, starting from the position according to FIG. 3 and FIG. 4 in the direction of the closer shaft 2 moves (opening operation of the door), it may happen that a low volume flow through the throttle channel 32 flows from the second pressure chamber 22 into the first pressure chamber 21. The filter 40b within the second pressure chamber 22 thus prevents unwanted particles from entering the throttle valve 31 in such a case, which would result in undesired contamination. It is also conceivable that a filtering of the damping medium 4 takes place within the third pressure chamber 23, which is not explicitly shown.

The door operator 1 according to FIG. 3 and FIG. 4 is further provided with a closure means 50 which can be brought into a closed position and an open position. According to FIG. 3 and FIG. 4 the door is in the closed position, wherein at the same time the closure means 50 is in the open position. The closure means 50 is designed with a closure element 51, which in the present embodiment is a ball. The closure means 51 also has a plunger 52 which projects through an opening of a seat 53 of the closure means 50 into the first pressure chamber 21. In the illustrated open position of the closure means 50, the closure element 51 has a certain distance from the seat 53. On the opposite side of the plunger 52 of the closure element 51 is a spring element 46, which is designed as a compression spring.

The door is in its open position, the piston 11 - according to the embodiment according to FIG. 1 - A certain distance from the filter 40a. In this spaced position of the filter 40 a to the first piston 11, the closure means 50 is in its closed position, in which the closure element 51 rests on the seat 53.

One of the essential differences from the embodiment according to FIG. 1 and FIG. 2 is that the housing 3 of the door operator 1 has two throttle valves 31 arranged in parallel throttle channels 32 are. The left throttle channel 32 connects the closure means 50 with the left throttle valve 31. The right throttle passage 32 connects the right throttle valve 31 with the circulating fluid passage 42 of the filter 40 a. Now is the door in an open position, the piston 11 - according to the statements according to FIG. 1 - A certain distance from the filter 40a. Now approaches the piston 11 the filter 40a due to a corresponding rotation of the shutter shaft 2, the damping medium 4 flows only through the filter surface 41 of the filter 40a in the direction of the right throttle valve 31. While the free end 11a of the first piston 11 spaced from the closure means 50th is the closing means 50 reliably remains in its closed position, in which effectively prevents the damping medium 4 can flow into the left throttle valve 31. Only in the position in which the free end 11 a of the first piston 11 with its stop surface 17 contacts the plunger 52 and the closure member 51 moves out of the seat 53, in addition, the damping medium 4 via the left throttle valve 31 from the first pressure chamber 21 in the second pressure chamber 22 are passed. Thus, the left throttle valve 31 is protected from contamination, according to Figure 3 on the closure means 50, a corresponding additional filter 40a is arranged, which substantially corresponds to the filter 40a, which is located within the first pressure chamber 21. When the first piston 11 subsequently moves back again in the direction of the second pressure chamber 22, the spring element 46 ensures that the closure element 51 contacts the seat 53 and thus reliably reaches the closure means 50 in its closed position.

The embodiment according to FIG. 4 essentially differs from the embodiment according to FIG. 3 in that a filter 40a is used in the region of the first pressure chamber 21, which has two circumferential channels 42 which are separated from one another by a seal 45 arranged on the filter 40a. The left circumferential fluid channel 42 is here associated with the left throttle valve 31 and the right circumferential Fluid channel 42 is associated with the right throttle valve 31. The in FIG. 4 used filter 40a substantially corresponds to the described filter according to FIG. 1, FIG. 2 and FIG. 6 , wherein two ring-like circumferential filter surfaces 41 are used within a filter 40 a. Depending on the position of the piston 11, both filter surfaces 41 can be separated from one another by the closure means 50, which is integrated in the filter 40a.

Thus, the piston 11 according to all embodiments shown FIG. 1 to FIG. 5 can reliably be moved back in the direction of the axis 6, when the door is opened, an unillustrated spring element exerts a certain force on the free end 11 a of the piston 11, so that the piston 11 in the direction of the second pressure chamber 22 undergoes a movement , The spring element may, for example, be arranged in the filter 40a and, during the movement of the piston 11 in the direction of the second pressure chamber 22, ensure that the piston 11 always remains in contact with the transmission element 13. The spring element can also on the piston 11, as in FIG. 5 shown to be arranged.

Of course, the embodiment is made FIG. 5 also to the embodiments according to the FIGS. 4 and 5 obtainable, that means that the stroke movement of the piston 11 ends before the filter 40a.

The present invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of different versions of a door operator is possible, which may be designed as Gleitschienentürbetätiger, as Obertürbetätiger, as a floor door operator or as a frame door operator.

LIST OF REFERENCE NUMBERS

1

door actuators

2

closer shaft

3

casing

3a

housing inner wall

4

Damping medium, hydraulic oil

5

Closing element, screw plug

6

axis

7

axis

8th

screw

10

piston system

11

first piston

11a

free end of the first piston

12

second piston

13

Power transmission element, Hubkurvenelement

14

first role

15

spring element

16

second role

17

stop surface

18

spring element

21

first pressure chamber

22

second pressure chamber

23

third pressure chamber

30

channel arrangement

31

throttle valve

32

throttle channel

33a

Channel of the piston 11

33b

Channel of the piston 12

34

check valve

40a, 40b

filter

41

filter area

42

circulating fluid channel

43

inner space

44

contact area

45

poetry

46

spring element

47

strengthening web

50

closure means

51

Closure element, ball

52

tappet

53

Seat

Claims (24)

1. A door actuator (1) for opening and/or for closing a door with a closer shaft (2), which can be coupled to the door, including
   a housing (2),
   at least one piston (11, 12) which is in operative connection with the closer shaft (2), and displaceable within the housing (3),
   at least one first (21) and one second pressure compartments (22, 23), which are separated by means of the piston (11, 12) and are filled with a dampening medium (4),
   a channel arrangement (30), within which, depending on the movement of the piston (11, 12), the dampening medium (4) can flow between the first (21) and the second pressure compartments (22, 23),
   a throttle valve (31), which is provided within the channel arrangement (30) for dampening the movement of the piston (11, 12), and
   at least one filter (40a, 40b), which protects the throttle valve (31) from potential soiling,
   characterized in that
   the filter (40a, 40b) and the housing (3) form a common fluid channel (42) through which the dampening medium (4) can flow in the direction of the throttle valve (31), wherein the filter (40a, 40b) presents a filtering surface which circumferentially faces the housing (3), wherein the filter (40a, 40b) adjoins the housing (3), wherein the fluid channel (42) circumferentially extends between the housing (3) and the filtering surface (41).
2. The door actuator (1) according to claim 1, characterized in that the filter (40a) is disposed in such a way in the first pressure compartment (21) that the filter (40a), at least partially, is located within the stroke range of the piston (11) or outside the stroke range of the piston (11).
3. The door actuator (1) according to claim 1 or 2, characterized in that an additional filter (40b) is disposed in the second pressure compartment (22).
4. The door actuator (1) according to any of the preceding claims, characterized in that the filtering surface (41) is configured in a ring-shape, whereby, during the movement of the piston (11, 12), the dampening medium (4) flows through the filtering surface (41) and, after having passed through the filtering surface (41), simultaneously the flow direction of the dampening medium (4) is diverted.
5. The door actuator (1) according to any of the preceding claims, characterized in that the filter (40a, 40b) features an inner compartment (43), which is configured open towards the first (21) and/or second pressure compartment (22) and is separated from the circumferential fluid channel (42) by means of the filtering surface (41).
6. The door actuator (1) according to any of the preceding claims, characterized in that the filter (40a, 40b) is disposed in such a manner in the first (21) and/or second pressure compartments (22) that a diversion of the flow direction is effected both in the inner compartment (43) of the filter (40a, 40b) and in the circumferential fluid channel (42).
7. The door actuator (1) according to any of the preceding claims, characterized in that the filtering surface (41) consists of a fabric or of a non-woven.
8. The door actuator (1) according to any of the preceding claims, characterized in that the filter (40a, 40b) consists of a sintering element.
9. The door actuator (1) according to any of the preceding claims, characterized in that the channel arrangement (30) presents a throttle channel (32) which extends between the circumferential fluid channel (42) and the throttle valve (31).
10. The door actuator (1) according to any of the preceding claims, characterized in that the filter (40a) features a plurality of circumferential channels (42), which are separated from each other by a sealing (45) which is disposed at the filter (40a), wherein simultaneously the channel arrangement (30) features a plurality of throttle valves (31) and throttle channels (32), wherein one throttle channel (32) is individually associated to each circumferential fluid channel (42).
11. The door actuator (1) according to any of the preceding claims, characterized in that the channel arrangement (30) extends in the housing (3) and/or in the piston (11, 12).
12. The door actuator (1) according to any of the preceding claims, characterized in that the piston (11, 12) is incorporated into a piston system (10), which features a first (11) and a second pistons (12) which, depending on the closer shaft (2), are movable within the housing (3).
13. The door actuator (1) according to any of the preceding claims, characterized in that the first piston (11) separates the first pressure compartment (21) from the second pressure compartment (22) and the second piston (12) separates the second pressure compartment (22) from the third pressure compartment (23), wherein the pressure compartments (21, 22, 23) are connected to each other by means of the channel arrangement (30).
14. The door actuator (1) according to any of the preceding claims, characterized in that the closer shaft (2) is connected to a force transmitting element (13) in a torsion-resistant manner, which is in contact with a first roller (14), which is supported in the second piston (12) to be rotatable.
15. The door actuator (1) according to any of the preceding claims, characterized in that the second piston (12) is in operative connection with a spring element (15), which is disposed in the third pressure compartment (23).
16. The door actuator (1) according to any of the preceding claims, characterized in that the force transmitting element (13) is in contact with a second roller (16), which is supported in the first piston (12) to be rotatable.
17. The door actuator (1) according to any of the preceding claims, characterized in that the free end (11 a) of the piston (11), which end faces the filter (40a), features a smaller diameter than the diameter of the inner compartment of the filter (40a).
18. The door actuator (1) according to any of the preceding claims, characterized in that, in an opening position of the door, the free end (11 a) of the piston (11) features a distance to the filter (40a) wherein in a closing position of the door

    a) the free end (11 a) of the piston (11) is located within the inner compartment (43) of the filter (40a) or

    b) the free end (11 a) of the piston (11) features a distance to the filter (40a) which is smaller than the distance the piston (11) features to the filter (40a) when the door is in the opening position.
19. The door actuator (1) according to any of the preceding claims, characterized in that a closing screw (5), which closes off the first pressure compartment (21) with regard to the surroundings, is affixed to the housing (3), wherein the filter (40a) is rotatably disposed a the closing screw (5).
20. The door actuator (1) according to any of the preceding claims, characterized in that, in the closing position of the door, a spring element (18) acts upon the first piston (11), which element, upon movement of the door into its opening position, moves the piston (11) in the direction of the closer shaft (2).
21. The door actuator (1) according to any of the preceding claims, characterized in that the closer shaft (2) extends through the filter (40b).
22. The door actuator (1) according to any of the preceding claims, characterized in that the force transmitting element (13) is a cam-disc element (13), wherein the closer shaft (2) and the cam-disc element (13) have a common axis of rotation (6) and in that the cam-disc element (13) is eccentrically disposed at the axis of rotation (6).
23. The door actuator (1) according to any of the preceding claims, characterized in that a closing means (50) is provided, which can be brought into a closing position and an opening position, wherein, in the opening position of the door, the closing means (50) is in the closing position, and in the closing position of the door, the closing means (50) is in the opening position.
24. The door actuator (1) according to any of the preceding claims, characterized in that the filter (40a, 40b) features a mounting axis, which corresponds to the axis (6, 7) of the piston (11) and/or of the closer shaft (2), wherein the filtering surface (41) extends parallel with regard to the axis (6, 7) or is inclined by a defined angle with regard to the axis (6, 7).

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