2results about How to "Realize automatic alarm function" patented technology

This invention discloses an anti-theft alarm fastener. By integrating a position detection module, a control module, and an alarm module into the male and female buckles of an existing magnetic fastener, it achieves real-time monitoring of the fastener's connection status and automatic alarm functions upon unauthorized separation. The control module, with its function selection button, allows the fastener to flexibly switch between at least two operating modes: alarm function off or on. This greatly improves the product's practicality and applicability, meeting diverse user needs in different situations. The position detection module uses a magnetic trigger and a Hall sensor element to form a non-contact position detection module, avoiding reliability issues caused by contact oxidation, wear, or poor contact in traditional mechanical switches. Furthermore, the mating structure of the mounting groove and positioning recess improves the accuracy and consistency of detection, effectively avoiding misjudgments or missed alarms due to positional misalignment.

The utility model discloses an EFU capable of realizing an automatic alarm function, which comprises a fan filter box body, a single-phase alternating current power supply, a switching power supply unit and a direct current fan unit are arranged in the fan filter box body, and a power supply control unit and a power supply indicating lamp are connected between the single-phase alternating current power supply and the switching power supply unit. A differential pressure sensor unit, a resistance alarm buzzer unit, a resistance differential pressure switch unit, a fault alarm buzzer unit, a fault differential pressure switch unit and a PWM (Pulse Width Modulation) speed regulator unit are connected between the switching power supply unit and the direct current fan unit; an RS pressure difference transmitter and a filter resistance detection pressure difference switch are positioned and mounted at the top of the fan filtering box body. According to the EFU capable of achieving the automatic alarm function, for an EFU draught fan without the networking function and the alarm function, the filter screen service life alarm function and the draught fan fault alarm function are achieved through the external differential pressure gauge and the differential pressure switch.