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DE-102010022051-B4 - Door closer with magnetic directional control valve

DE102010022051B4DE 102010022051 B4DE102010022051 B4DE 102010022051B4DE-102010022051-B4

Abstract

Door closers (41), in particular swing door closers, with hold-open or free-running function, including door closers (41) a door closer housing (42), an output shaft (48) that can be connected to a door, a piston assembly (94) connected to the output shaft (48) and guided in the door closer housing (42), a closing spring (56), a piston rod (54) arranged to connect the piston assembly (94) with the closing spring (56), a hydraulic locking chamber (61) designed to block the closing spring (56), and a solenoid directional control valve (1), in particular a 3/2 solenoid directional control valve, wherein a closing damping chamber (58) is formed on one side of the piston assembly (94) facing away from the piston rod (54) between the door closer housing (42) and the piston assembly (94), and wherein the magnetic directional control valve (1) controls at least the pressures in the closing damping chamber (58) and in the blocking chamber (61).

Inventors

  • Thomas Salutzki
  • Volker Bienek

Assignees

  • DORMAKABA DEUTSCHLAND GMBH

Dates

Publication Date
20260513
Application Date
20100531
Priority Date
20091201

Claims (14)

  1. Door closers (41), in particular swing door closers, with hold-open or free-running function comprising a door closer housing (42), an output shaft (48) connectable to a door, a piston assembly (94) connected to the output shaft (48) and guided in the door closer housing (42), a closing spring (56), a piston rod (54) arranged to connect the piston assembly (94) to the closing spring (56), a hydraulic locking chamber (61) designed to block the closing spring (56), and a solenoid directional control valve (1), in particular a 3/2 solenoid directional control valve, wherein a closing damping chamber (58) is formed on a side of the piston assembly (94) facing away from the piston rod (54) between the door closer housing (42) and the piston assembly (94), and wherein the solenoid directional control valve (1) controls at least the pressures in the closing damping chamber (58) and in the locking chamber (61).
  2. Door closer after Claim 1 , characterized by a freewheel arrangement which is designed to allow translational movement of the piston assembly (94) decoupled from the closing spring (56) when the closing spring (56) is blocked.
  3. Door closer according to one of the preceding claims, characterized by a fluid-tight partition (53) arranged in the door closer housing (42) between the piston assembly (94) and the closer spring (56), wherein the piston rod (54) passes fluid-tight through the partition (53).
  4. Door closer according to one of the preceding claims, characterized by a closer spring tension piston (55) guided in the door closer housing (42) and bearing against the closer spring (56).
  5. Door closer after Claim 4 , characterized in that the locking space (61) is formed between the partition (53) and the closing spring tension piston (55).
  6. Door closer after Claim 2 , characterized in that the freewheel arrangement is designed as a sliding coupling which transmits exclusively pressure forces between the closing spring (56) and the piston assembly (94).
  7. Door closer according to one of the preceding claims, characterized in that the output shaft (48) comprises a cam-shaped rolling contour (49), in particular a cam disc, and the piston assembly (94) comprises at least one cam roller (47, 50) bearing on the rolling contour (49).
  8. Door closer according to one of the preceding claims, characterized in that a first hydraulic line, in particular a pressure line (P), leads from the locking chamber (61) to the solenoid directional control valve (1), a second line, in particular a working line (A), leads from the closing damping chamber (58) to the solenoid directional control valve (1), and a third line, in particular a tank line (T), leads from the solenoid directional control valve (1) to a tank chamber (31).
  9. Door closer after Claim 3 , characterized by an opening damping chamber (60) between the piston assembly (94) and the partition (53) or between the piston assembly (94) and the additional piston (95), and a first throttled connection (78) between the opening damping chamber (60) and the tank chamber (31).
  10. Door closer after Claim 9 , characterized by a first unthrottled connection (77) between the opening damping chamber (60) and the tank chamber (31), wherein the first throttled connection (78) is always open and the first unthrottled connection (77) is closed or open depending on the position of the piston assembly (94).
  11. Door closer after Claim 8 , characterized by at least one further throttled connection (75, 76) which is arranged between the closing damping chamber (58) and the tank chamber (31).
  12. Door slammer after one of the Claims 8 until 11 , characterized in that the solenoid directional control valve (1) in a first switching position connects the first line to the third line and blocks the second line, and in a second switching position connects the second line to the third line and blocks the first line.
  13. Door closer after one of the Claims 8 until 11 , characterized in that the solenoid directional control valve (1) connects the first line to the second line in a first switching position, and in a second switching position connects the second line to the third line and blocks the first line.
  14. Door closer according to one of the preceding claims, characterized in that the magnetic directional control valve releases the closing spring (56) in the unenergized state and allows free movement in the energized state.

Description

The invention relates to a door closer with a magnetic directional control valve. The current state of the art distinguishes between door closers and door operators. With door closers, the door must be opened manually by a person. During the opening process, energy is stored, for example, in a closer spring, and the door closer can then close the door automatically using this stored energy. In contrast, a door operator is a device that uses additional auxiliary energy, such as an electric motor and hydraulics, to open and close the door automatically. Significant differences become apparent when considering the hydraulic circuits in door operators and door closers. Door operators always contain a motor and a pump that generate the necessary hydraulic pressure. The corresponding pressure chambers are then actively pressurized with hydraulic pressure, which causes the door to open. The pressure is thus generated in the door operator by the internal components: the motor and pump. In contrast, the pressure chambers in a door closer fill through expansion of the chambers and by drawing hydraulic oil from other parts of the door closer. Here, opening the door provides the energy for the closer spring and for building up pressure in the door closer. The force and moment curves as well as the loads that occur are therefore fundamentally different for a door closer and a door drive. DE 34 23 242 C1 The figure shows a door closer featuring a closing-direction load-bearing closer shaft that guides the movable piston of a hydraulic piston-cylinder unit used for damping purposes. The pressurized chamber of the piston-cylinder unit is connected to the unpressurized chamber via a return channel with a throttling device on one side and a check valve opening towards the pressurized chamber on the other. A self-moving support element is interposed between the piston and the spring assembly. This support element can be actuated by external energy in the form of a spring preload, controlled by the door operation. However, to constantly indicate to the door user that the door leaf they are operating has a door closer and thus prevent accidents, the damping piston is continuously biased in the closing direction by a second energy storage device that exerts a lower force than the spring assembly. Further state of the art DE 10 2004 061 619 B3 , US 4 115 897 A and WO 2006/ 066 666 A1 . The object of the present invention is to provide a door closer that is very slim and cost-effective to manufacture, and therefore can also be used as an integrated door closer in, for example, a door frame or a door. Furthermore, the door closer should have a hold-open function or a free-swing function. The problem is solved by the features of the independent claims. The dependent claims relate to advantageous further developments of the invention. The problem is thus solved by a door closer, in particular a swing door closer with a hold-open or free-running function, comprising a door closer housing, an output shaft connectable to a door, a piston assembly connected to the output shaft and guided in the door closer housing, a closing spring, a piston rod arranged for connecting the piston assembly to the closing spring, and a hydraulic locking chamber designed to block the closing spring. Furthermore, the door closer comprises a solenoid directional control valve, in particular a 3/2-way solenoid directional control valve, wherein a closing damping chamber is formed between the door closer housing and the piston assembly on a side of the piston assembly facing away from the piston rod, in particular on the side of a damping piston. According to the invention, the solenoid directional control valve controls at least the pressures in the closing damping chamber and in the locking chamber. Preferably, the door closer comprises a free-swing arrangement designed to allow translational movement of the piston assembly decoupled from the closer spring when the closer spring is blocked. Alternatively, in the hold-open function, the closer spring is rigidly twisted to the piston assembly, so that blocking the closer spring simultaneously locks the piston assembly and thus the door. The solenoid valve allows the locking chamber to be hydraulically sealed. This prevents the pre-tensioned closing spring from relaxing, thus activating the door closer's free-running function. Switching the solenoid valve releases the pressure in the locking chamber, allowing the closing spring to move the piston assembly, for example in the event of a fire, and thus close the door via the output shaft. Door closers with a free-swing function are primarily used in facilities for people with physical disabilities, senior living facilities, or kindergartens, as well as for securing fire doors. They are often used in combination with a fire alarm system. The closing of these doors is ensured to prevent the spread of smoke and fire, without requiring users to constantly exert the op