Electromagnetic door closing system

Abstract

An electromagnetic door closing system is installed on a door. The electromagnetic door closing system includes an electromagnetic door closer, an input power supply and an indicator. The electromagnetic door closer is suitable for being installed on the door. The electromagnetic door closer can be switched between a first state and a second state which is different from the first state. In the first state, the electromagnetic door closer can provide a force to close the door. In the second state, the electromagnetic door closer does not provide a force to close the door. The input power supply is coupled to the electromagnetic door closer to supply an input voltage. The indicator is coupled to the input power supply, and is used to indicate whether the input power supply meets a predetermined voltage range, wherein when the input power supply meets the predetermined voltage range, the electromagnetic door closer can be switched from the first state to the second state; when the input voltage does not meet the predetermined voltage range, the electromagnetic door closer cannot be switched to the second state.

Description

Technical Field

[0001] The present invention relates to an electromagnetic door closer system, and in particular to an electromagnetic door closer system capable of identifying whether a supply voltage is insufficient. Prior Art

[0002] Current electromagnetic door closers on the market all include a power switch. It's known that input voltage can drop due to series or parallel shunting in the environment. The standard input voltage for door closers is 24VDC or 240VAC. While various products can operate within a certain input voltage range without affecting the product, if a product fails, users must verify whether it's due to insufficient supply voltage or a genuine product problem. This is very inconvenient. Furthermore, in the case of insufficient supply voltage, some users may mistakenly believe the problem is due to poor product quality, which can undermine consumer trust in the product and brand. Summary of the Invention

[0003] Therefore, an object of the present invention is to provide an electromagnetic door closer system that can identify whether the power supply voltage is insufficient.

[0004] An embodiment of the present invention provides an electromagnetic door closer system installed on a door. The electromagnetic door closer system includes an electromagnetic door closer, an input power supply, and an indicator unit. The electromagnetic door closer is adapted to be installed on the door and is switchable between a first state and a second state different from the first state. In the first state, the electromagnetic door closer can provide a force to close the door, and in the second state, the electromagnetic door closer does not provide a force to close the door. The input power supply is coupled to the electromagnetic door closer to supply an input voltage to the electromagnetic door closer. The indicator unit is coupled to the input power supply to indicate whether the input voltage falls within a predetermined voltage range. When the input voltage falls within the predetermined voltage range, the electromagnetic door closer can be operated to switch from the first state to the second state. When the input voltage falls within the predetermined voltage range, the electromagnetic door closer cannot switch to the second state. Simple diagram description

[0005] FIG1 is a block diagram of an electromagnetic door closer system according to an embodiment of the present invention.

[0006] FIG2 is a block diagram of an electromagnetic door closer system according to another embodiment of the present invention.

[0007] FIG3 is a schematic diagram of the electromagnetic door closer of the electromagnetic door closer system of FIG1 and FIG2.

[0008] FIG4 is a circuit diagram of the electromagnetic door closer system in FIG1. Implementation Method

[0009] Door closers provide a safe and simple door control solution suitable for a variety of scenarios, whether they are security doors, wooden doors, or glass doors. They feature a long service life, constant return force, and adjustable closing speed, making them a convenient door control solution. Electromagnetic door closers, when powered, can maintain a door open at a specific angle or allow the user to open and close the door freely. When powered off, they offer adjustable closing speed. However, powered electromagnetic door closers can sometimes experience input voltage drops due to series or parallel shunting, affecting the electromagnetic door closer's functional state switching. Therefore, electromagnetic door closers must provide user warnings (such as lighting or beeping) when the input power voltage drops.

[0010] Figure 1 is a block diagram of an electromagnetic door closer system 10 according to an embodiment of the present invention. The electromagnetic door closer system 10 is mounted on a door and includes an electromagnetic door closer 102, an input power supply 104, and an indicator light 106 (which can be any indicator unit). The electromagnetic door closer 102 is mounted on the door and can switch between a first state and a second state, which is different from the first state. In the first state, the electromagnetic door closer 102 provides a force that causes the door to slowly close. In the second state, the electromagnetic door closer 102 does not provide a force that causes the door to slowly close. In this state, the door can open and close freely or remain open at a certain angle. The input power supply 104 is coupled to the electromagnetic door closer 102 to provide an input voltage (e.g., 24V). The indicator light 106 is coupled to the input power supply 104 to indicate whether the input voltage of the input power supply 104 is insufficient to cause the electromagnetic door closer 102 to switch from the first state to the second state. In one embodiment, the indicator light 106 illuminates continuously when the input voltage is greater than a first threshold, and flashes or turns off when the input voltage is less than the first threshold as a warning. The first threshold can be set to 20.4V (i.e., 85% of the input voltage). In another embodiment, the indicator light 106 generates different colors depending on the input voltage. For example, the indicator light 106 illuminates red when the input voltage is less than a second threshold, illuminates yellow when the input voltage is between the first and second thresholds, and illuminates green when the input voltage is greater than the first threshold. The first threshold is greater than the second threshold. When the input voltage is less than the second threshold, the electromagnetic door closer 102 cannot switch from the first state to the second state. When the input voltage is between the first and second thresholds, the electromagnetic door closer 102 may not switch from the first state to the second state. In one embodiment, the first threshold can be set to 20.4V (i.e., 85% of the input voltage), and the second threshold can be set to 16.8V (i.e., 70% of the input voltage).

[0011] Figure 2 is a block diagram of an electromagnetic door closer system 20 according to another embodiment of the present invention. The electromagnetic door closer system 10 may include a buzzer 108, coupled to the input power source 104, to indicate whether the input voltage of the input power source 104 is insufficient to switch the electromagnetic door closer 102 from the first state to the second state. In one embodiment, the buzzer 108 does not sound when the input voltage is greater than a first threshold, but sounds a warning tone when the input voltage is less than the first threshold. In another embodiment, the buzzer 108 produces different beeps depending on the magnitude of the input voltage. For example, the buzzer 108 emits a high-frequency beep when the input voltage is less than a second threshold, a low-frequency beep when the input voltage is between a first threshold and a second threshold, and no beep when the input voltage is greater than the first threshold. The first threshold is greater than the second threshold, and when the input voltage is less than the second threshold, the electromagnetic door closer 102 cannot switch from the first state to the second state. When the input voltage is between the first threshold and the second threshold, the electromagnetic door closer 102 may not switch from the first state to the second state. In one embodiment, the first threshold can be set to 20.4V (i.e., 85% of the input voltage), and the second threshold can be set to 16.8V (i.e., 70% of the input voltage). In the present invention, the indicator unit can be any indicator device and is not limited to the indicator light 106 and the buzzer 108.

[0012] In one embodiment, the electromagnetic door closer systems 10 and 20 may further include a switch coupled to the input power source 104 and the electromagnetic door closer 102 for electronically activating or deactivating the electromagnetic door closer 102. When the switch is on, the electromagnetic door closer 102 switches to a second state, thereby opening the door to a specific angle or allowing the door to open and close freely. When the switch is off, the electromagnetic door closer 102 switches to a first state, thereby providing force to slowly close the door.

[0013] Figure 3 is a schematic diagram of the electromagnetic door closer 102 of the electromagnetic door closer systems 10 and 20. In one embodiment, the electromagnetic door closer 102 further includes a hydraulic rod 302. When the switch 202 is on, the electromagnetic door closer 102 switches to a second state, thereby opening the door to a specific angle or allowing the door to open and close freely. When the switch 202 is off, the electromagnetic door closer 102 switches to a first state, at which point the hydraulic rod 302 provides force to slowly close the door. The electromagnetic door closer 102 can be either a hydraulic or pneumatic type. Hydraulic door closers use a spring to provide the restoring force to close the door, while hydraulic oil, combined with associated oil valves, can adjust the door's restoring speed. Pneumatic door closers use a pneumatic control valve to control the opening and closing of the door. Pneumatic door closers are vibration-resistant and typically include a hydraulic rod 302.

[0014] Figure 4 is a circuit diagram of an electromagnetic door closer system 10 according to an embodiment of the present invention. The electromagnetic door closer system 10 includes an electromagnetic door closer 102, an input power source 104, an indicator light 106, a switch 202, a transistor 204, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The electromagnetic door closer also includes a fifth resistor R5. A first end of the switch 202 is coupled to the input power source 104, a first end of the first resistor R1 is coupled to the second end of the switch 202, a first end of the second resistor R2 is coupled to the second end of the switch 202, a collector end of the transistor 204 is coupled to the second end of the second resistor R2, a base end of the transistor 204 is coupled to the second end of the first resistor R1, a first end of the third resistor R3 is coupled to the emitter end of the transistor 204, a first end of the indicator light 106 is coupled to the second end of the third resistor R3, a first end of the fourth resistor R4 is coupled to the second end of the indicator light 106, a first end of the fifth resistor R5 is coupled to the second end of the switch 202, a second end of the fifth resistor R5 is coupled to the second end of the fourth resistor R4, a first end of the electromagnetic door closer 102 is coupled to the second end of the switch 202, and a second end of the electromagnetic door closer 102 is coupled to the second end of the fourth resistor R4.

[0015] In one embodiment, transistor 204 may be a bipolar junction transistor (BJT), first resistor R1 may be a variable resistor, indicator light 106 may be a light-emitting diode (LED), the first end of indicator light 106 may be the anode of the LED, and the second end of indicator light 106 may be the cathode of the LED. In one embodiment, the resistance value of first resistor R1 is approximately 12k ohms to 14k ohms, the resistance value of second resistor R2 is approximately 2k ohms, the resistance value of third resistor R3 is approximately 4.6k ohms, the resistance value of fourth resistor R4 is approximately 1.5k ohms, and the resistance value of fifth resistor R5 is approximately 127 ohms. In one embodiment, "approximately" means that the deviation from the actual value is less than ±20%, preferably less than ±10%, and more preferably less than ±5%. The resistance values ​​provided in the embodiment are designed for one design; different electromagnetic door closer products may have different designed resistance values, and the present invention is not limited thereto.

[0016] In one embodiment, when the voltage of the input power source 104 is less than a first threshold and the switch 202 is turned on, the transistor 204 is not turned on, resulting in no current flowing through the indicator light 106, and the indicator light 106 being unlit. When the voltage of the input power source 104 is greater than 20.4V (e.g., 24V) and the switch 202 is turned on, the transistor 204 is turned on, causing current to flow through the indicator light 106, and the indicator light 106 to illuminate. The illumination of the indicator light 106 indicates that the input power source 104 is operating normally, while the absence of the indicator light 106 indicates that the voltage of the input power source 104 is insufficient and requires inspection to prevent the electromagnetic door closer 102 from malfunctioning.

[0017] In summary, the present invention provides an electromagnetic door closer system 10, 20 that can provide an indicator light or buzzer warning when the input voltage of the input power supply 104 does not meet a predetermined voltage range, thereby facilitating user inspection and ensuring the normal operation of the electromagnetic door closer 102.

[0018] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

[0019] 10, 20: Electromagnetic door closer system

[0020] 302: Hydraulic rod

[0021] 102: Electromagnetic door closer

[0022] 104: Input power

[0023] 106: Indicator light

[0024] 108:Buzzer

[0025] 202: Switch

[0026] 204: Transistor

[0027] R1: first resistor

[0028] R2: Second resistor

[0029] R3: The third resistor

[0030] R4: the fourth resistor

[0031] R5: The fifth resistor

Claims

1. An electromagnetic door closer system, adapted to be installed on a door, comprising: An electromagnetic door closer is suitable for installation on the door, and the electromagnetic door closer can switch between a first state and a second state different from the first state. In the first state, the electromagnetic door closer can provide a force to close the door, and in the second state, the electromagnetic door closer does not provide a force to close the door; an input power supply is coupled to the electromagnetic door closer, which is used to supply the electromagnetic door closer with an input voltage; and an indication unit is coupled to the input power supply, which is used to indicate whether the input power supply meets a predetermined voltage range, wherein when the input voltage meets the predetermined voltage range, the electromagnetic door closer can be operated to switch from the first state to the second state, and when the input voltage does not meet the predetermined voltage range, the electromagnetic door closer cannot switch to the second state.

2. The electromagnetic door closer system according to claim 1, further comprising: A switch is coupled to the input power source and the electromagnetic door closer, and is used for switching the electromagnetic door closer from the first state to the second state when the input voltage meets the predetermined voltage range.

3. The electromagnetic door closer system according to claim 2, further comprising: A first resistor, comprising: a first end, coupled to the switch; and a second end; a second resistor, comprising: a first end, coupled to the switch; and a second end; a transistor, comprising: a collector end, coupled to the second end of the second resistor; a base end, coupled to the second end of the first resistor; and an emitter end; a third resistor, comprising: a first end, coupled to the emitter end of the transistor; and a second end; a fourth resistor, comprising: a first end; and a second end, coupled to the electromagnetic door closer; and wherein the indicating unit is a light emitting diode, comprising: an anode, coupled to the second end of the third resistor; and a cathode, coupled to the first end of the fourth resistor.

4. The electromagnetic door closer system according to claim 3, wherein the electromagnetic door closer comprises: A fifth resistor includes: a first end coupled to the first end of the second resistor; and a second end coupled to the second end of the fourth resistor.

5. The electromagnetic door closer system according to claim 4, wherein the first resistor is a variable resistor having a resistance value of 12k ohms to 14k ohms.

6. The electromagnetic door closer system of claim 4, wherein the resistance value of the second resistor is approximately 2 k ohms, the resistance value of the third resistor is approximately 4.6 k ohms, the resistance value of the fourth resistor is approximately 1.5 k ohms, and the resistance value of the fifth resistor is approximately 127 ohms.

7. The electromagnetic door closer system of claim 3, wherein when the switch is turned on, if the input voltage is greater than a first threshold, the indicator unit is constantly lit, and if the input voltage is less than the first threshold, the indicator unit flashes or does not light up.

8. The electromagnetic door closer system of claim 2, wherein the electromagnetic door closer comprises a hydraulic rod, and when the switch is turned on, the electromagnetic door closer opens the door to a certain angle; when the switch is turned off, the hydraulic rod controls the door to slowly close.

9. The electromagnetic door closer system according to claim 1, wherein the indicator unit is a buzzer for emitting a sound for warning when the input voltage is less than a first threshold.

10. The electromagnetic door closer system according to claim 1, wherein the indicator unit generates light signals of different colors according to the magnitude of the input voltage.

11. An electromagnetic door closer system as described in claim 10, wherein the indicator unit lights up red when the input voltage is less than a second threshold value, lights up yellow when the input voltage is between a first threshold value and the second threshold value, and lights up green when the input voltage is greater than the first threshold value, and the first threshold value is greater than the second threshold value.

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