Door closer for adjusting a pushing force of releasing a door kept in an open state

Abstract

A door closer is disclosed for adjusting the thrust required to release a door flap from an open position. The door closer includes a body, a valve assembly, a piston, a safety valve, and a pressure relief valve. The body has a first oil chamber with a first volume and a second oil chamber with a second volume. The piston is disposed between the first and second oil chambers and is used to block the valve assembly to adjust the first and second volumes. The pressure relief valve connects the first and second oil chambers. The pressure relief valve includes an adjusting valve and a control module. The adjusting valve is disposed in an oil passage between the first and second oil chambers. The control module is connected to the adjusting valve and obtains a change in the obstruction area of ​​the adjusting valve in the oil passage when the piston blocks the valve assembly.

Claims

1. A door closer for adjusting a thrust to release a door from an open position, the door closer comprising: a body having a first oil chamber having a first volume and a second oil chamber having a second volume; a valve assembly; a piston disposed between the first and second oil chambers for blocking a portion of the valve assembly to adjust the first and second volumes; a safety valve correspondingly disposed on the piston; and a pressure relief valve communicating with the first and second oil chambers, the pressure relief valve comprising: an adjusting valve disposed in an oil passage between the first and second oil chambers; and a control module connected to the adjusting valve, the control module switching between the safety valve and the pressure relief valve to release the thrust of the door from the open position when the piston blocks a portion of the valve assembly; The valve assembly includes a door lock control valve, a speed control valve, and a return valve. The piston system blocks the door lock control valve or the speed control valve to adjust the connection of the return valve.

2. The door closer as described in claim 1, wherein the adjusting valve is located in an oil pipe with different dimensions at both ends, one cross-sectional area of ​​the adjusting valve corresponds to one shape of the oil pipe, and the adjusting valve controls the blocking area by adjusting its position within the oil pipe.

3. The door closer as described in claim 2, wherein the cross-sectional area of ​​the adjusting valve is trapezoidal or conical.

4. The door closer as claimed in claim 2, wherein the pressure relief valve is adjusted by changing its position within the oil pipe to adjust the obstruction area when the piston blocks the door lock control valve.

5. The door closer as described in claim 1, wherein the door closer further includes an oil valve switch, and the safety valve is affected by the oil valve switch to switch to an open mode or a closed mode.

6. The door closer as claimed in claim 5, wherein the oil valve switch includes a cover, a stop member and a drive member, the cover having an oil inlet and an oil return port, the stop member being located between the oil inlet and the oil return port, and the drive member being used to control the stop member to stop at a holding pressure between the oil inlet and the oil return port.

7. The door closer as claimed in claim 6, wherein the actuating element is an electromagnet, and the oil valve switch further includes a valve seat fixed to the cover to generate magnetic attraction under the influence of the electromagnet.

8. The door closer as claimed in claim 6, wherein the oil valve switch further includes a bridging member, through which the drive member drives the stop member to block the oil inlet and the oil return.

9. The door closer as claimed in claim 7, wherein the holding pressure provided by the actuator is less than or equal to 15 percent of one of the relief values ​​of the safety valve.

10. A door closer for adjusting a thrust to release a door from an open position, the door closer comprising: a body having a first oil chamber having a first volume and a second oil chamber having a second volume; a valve assembly; a piston disposed between the first and second oil chambers for blocking a portion of the valve assembly to adjust the first and second volumes; a safety valve correspondingly disposed on the piston; and a pressure relief valve communicating with the first and second oil chambers, the pressure relief valve comprising: an adjusting valve disposed in an oil passage between the first and second oil chambers; and a control module connected to the adjusting valve, the control module switching between the safety valve and the pressure relief valve to release the thrust of the door from the open position based on a change in the blocking area of ​​the adjusting valve in the oil passage when the piston blocks a portion of the valve assembly; The door closer also includes an oil valve switch, one of the driving components of which is an electromagnet. The oil valve switch also includes a valve seat, which is fixed to one of the covers of the oil valve switch so that it is magnetically attracted by the electromagnet.

11. The door closer as claimed in claim 10, wherein the adjusting valve is located in a hydraulic pipe with different dimensions at both ends, one cross-sectional area of ​​the adjusting valve corresponds to one shape of the hydraulic pipe, and the adjusting valve controls the blocking area by adjusting its position within the hydraulic pipe.

12. The door closer as described in claim 11, wherein the cross-sectional area of ​​the adjusting valve is trapezoidal or conical.

13. The door closer as claimed in claim 11, wherein the pressure relief valve is adjusted by changing its position within the oil pipe to adjust the obstruction area when the piston blocks one of the door lock control valves of the valve assembly.

14. The door closer as described in claim 10, wherein the safety valve is switched to an open mode or a closed mode by the switching of the oil valve.

15. The door closer as claimed in claim 10, wherein the oil valve switch includes a stop member, the cover has an oil inlet and an oil return port, the stop member is located between the oil inlet and the oil return port, and the drive member is used to control the stop member to stop at a holding pressure between the oil inlet and the oil return port.

16. The door closer as claimed in claim 15, wherein the oil valve switch further includes a bridging member, through which the drive member drives the stop member to block the oil inlet and the oil return.

17. The door closer as claimed in claim 15, wherein the holding pressure provided by the actuator is less than or equal to 15 percent of one of the relief values ​​of the safety valve.

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