A low pressure water mist nozzle for active fire protection from water supplied with supply water pressures of 0.5 bar to 20 bars, characterized by having a separation wall (3) with multiple openings (4) of sizes 01 mm to 02, 5 mm in angles of 10 to 50 to the wall surfaces, which are followed by a cavity (8) having a centrally located outlet opening (6) in its end wall, which are located opposite the separation wall (3) containing multiple openings (4).

A method for detecting an event in or around a building. The method includes recording a baseline signal characteristic that characterizes a wireless signal transmitted between devices in or around the building during a baseline time period and recording a second signal characteristic that characterizes the wireless signal during a second time period after the baseline time period. An event in or around the building is detected in response to a determination that the second signal characteristic is abnormal relative to the baseline signal characteristic, the event degrading the wireless signal during the second time period. An alarm is triggered in response to detecting the event.

A jet injection device that incorporates nanobubbles (ultrafine bubbles) in a mist includes: a two-fluid nozzle configured from a circular nozzle outer cylinder and an air connection tube integrally and perpendicularly connected to the nozzle outer cylinder; a nanobubble generation device that supplies the nozzle outer cylinder of the two-fluid nozzle with high-pressure nanobubble water; and a compressor that supplies the air connection tube of the two-fluid nozzle with high-pressure air. The gas-injected bubble water generated from the nanobubble generation device is pressure-fed to the nozzle outer cylinder of the two-fluid nozzle, and compressed air from the compressor is pressure-fed to the air connection tube of the two-fluid nozzle. In the two-fluid nozzle, the high-pressure gas-injected bubble water and the compressed air serve as a gas-liquid fluid mixture, and are injected at a high speed in mist form from a nozzle cylinder of the two-fluid nozzle.

The invention is characterized by consisting of a body (1) with a central cavity (2) having an open inlet-port (3), and one or multiple cylindrical shaped cavities (4i), which are connected to the central cavity via one or 5 more openings (5i) with cross section areas less that the cylindrical cavity (4i), and where there is one centrally located opening (6i) in the cylindrical cavity end surfaces opposite the openings (5i) into the central cavity (2).

A method for detecting an event in or around a building. The method includes recording a baseline signal characteristic that characterizes a wireless signal transmitted between devices in or around the building during a baseline time period and recording a second signal characteristic that characterizes the wireless signal during a second time period after the baseline time period. An event in or around the building is detected in response to a determination that the second signal characteristic is abnormal relative to the baseline signal characteristic, the event degrading the wireless signal during the second time period. An alarm is triggered in response to detecting the event.

An automatic high-speed rotary atomizing device, comprising a rotary spray head with an upper portion and a lower portion, the upper portion is connected to pressurized fluid, the lower portion is connected to the upper portion by means of one or more spray nozzles (1, 3) or spray orifices via a bearing (56). The upper portion is stationary. When the pressurized fluid is sprayed out from the spray nozzle, part of kinetic energy of the pressurized fluid generates a counterforce that propels the entire lower portion of the spray head to rotate at a high speed, so as to convert most of the kinetic energy of the pressurized fluid into surface energy that facilitates atomization of water flow when the pressurized fluid hits against a slanted surface or slit of the spray nozzle or passes through an aperture thereof, thereby forming a large-scale atomized, dispersed and swirling system. This automatic high-speed rotary atomizing device has low working pressure, high rotating speed, small and homogeneous fog droplets, and therefore can be widely used in fire extinguishing, flue gas purification, city purification, greenfield watering, landscape decoration, etc.

Fire protection systems and methods of fire protection systems for protection of a stored commodity. The systems and methods included a plurality of fluid distribution devices disposed above the stored commodity and configured for selective identification and controlled actuation in response to a fire. The systems have a hydraulic demand defined by at least one of: i) a hydraulic design area having a minimum operational area of less than 768 square feet; or ii) less than twelve hydraulic design devices.

An improved nozzle for use with a fire hose having an infra-red temperature sensor that is aligned with an output of the nozzle. The sensor will detect the infrared energy produced by a fire hot spot and provide a visual indication of the energy on a display. The temperature sensor operates a thermometer and is placed in the center of the discharge nozzle allowing water to pass around the sensor. A laser is positioned next to the sensor on the outlet of the nozzle to project a high intensity visible light toward the area that the IR sensor is directed.

A spray nozzle directs fluid forwardly, perpendicularly, and rearwardly angled from a fire hose to enhance spray distribution from a single piece nozzle. The spray nozzle includes a cylindrical body having an open end and a spray end. A plurality of apertures extends through the cylindrical body to expel fluid from the spray nozzle in a roughly spherical dispersal while atomizing the fluid to enhance firefighting capability.

A spray nozzle directs fluid forwardly, perpendicularly, and rearwardly angled from a fire hose to enhance spray distribution from a single piece nozzle. The spray nozzle includes a cylindrical body having an open end and a spray end. A plurality of apertures extends through the cylindrical body to expel fluid from the spray nozzle in a roughly spherical dispersal while atomizing the fluid to enhance firefighting capability.