2results about How to "Simplify installation work" patented technology

This utility model belongs to the field of air conditioning technology and discloses an easy-to-install air conditioning duct, including a duct flange one. A handle is fixedly installed inside the right side of the duct flange one. A lead screw is rotatably installed on the rear side of the handle. A nut is screwed onto the outside of the lead screw. A second duct flange is fixedly installed outside the nut. This utility model connects the handle on the right side of the duct flange one to the lead screw, and the nut on the outside of the lead screw connects to the second duct flange. When the handle is rotated, the lead screw rotates, causing the nut to move along the lead screw, thereby moving the second duct flange. During installation, workers only need to operate the handle to easily adjust the distance between the two duct flanges, eliminating the need for complex tools and a large amount of manpower for forced connection, greatly improving installation efficiency. Especially in narrow or high spaces where operation is difficult, this adjustment method makes installation work easy and simple.

This invention provides a frequency-to-analog safety barrier, comprising a voltage conversion circuit, a transformer coil drive circuit, a transformer, a first AC voltage rectification and filtering circuit, a frequency signal processing circuit, a NAMUR signal processing circuit, an NPNPNP signal processing circuit, a frequency processing circuit, an MCU control circuit, a TTL output interface, an isolation chip, a square wave processing circuit, a filtering circuit, a DC output circuit, and an alarm relay. The voltage conversion circuit is connected to the transformer via the transformer coil drive circuit. The transformer supplies power to the hazardous and safe zones via the first AC voltage rectification and filtering circuit. Multiple intrinsically safe terminals in the hazardous zone are connected to the frequency processing circuit via three signal processing circuits. The frequency processing circuit outputs to the MCU control circuit. The MCU output sequentially passes through the TTL interface, the isolation chip, the square wave processing circuit, and the filtering circuit to the DC output circuit. This invention achieves frequency signal to analog quantity conversion and safety isolation, increasing system stability.