Full cone spray nozzle for a low pressure fire protection system

Abstract

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).

Claims

1. A fire protection system comprising: at least one low pressure water mist nozzle in operable communication with a fire protection system configured to supply water through said at least one low pressure water mist nozzle at supply water pressures of 0.5 bar to 20 bars, wherein the low pressure water mist nozzle has a housing and a single separation wall (3) having both a centrally located opening (7) and multiple openings (4) of sizes 1 mm to 2.5 mm diameter, and wherein the multiple openings are at angles of 10 to 50 to the wall surfaces, the separation wall (3) is followed by a cavity (8) having a centrally located outlet opening (6) in its end wall (5), both the centrally located opening (7) and the multiple openings (4) extend between an inlet port (2) and the cavity (8), the end wall (5) is located immediately downstream of the separation wall (3) containing both the centrally located opening (7) and the multiple openings (4), wherein a surface of the end wall (5) facing the cavity (8) is conical, wherein the end wall and the housing are monolithic, wherein a thickness of the separation wall (3) is smaller than a length defined between the separation wall and the end wall (5), wherein the centrally located outlet opening (6) of the end wall (5) has a continuous nozzle surface defining an increasing cross-sectional area, and wherein the continuous nozzle surface is curved radially outwardly relative to a longitudinal axis of the nozzle, and wherein the cavity (8) is cylindrical in its entire length between the separation wall (3) and the conical end surface (5).

2. A fire protection system in accordance with claim 1, wherein the size of the centrally located outlet opening (6) having a diameter of 1.5 mm to 3 mm.

3. A fire protection system in accordance with claim 1, wherein the nozzle housing has an outer threaded connection (1) to an agent supply pipe system of the fire protection system.

4. A fire protection system comprising: at least one low pressure water mist nozzle in operable communication with a water supply configured to supply water through said at least one low pressure water mist nozzle at supply water pressures of 0.5 bar to 20 bars, wherein the low pressure water mist nozzle has a housing and a single separation wall (3) having both a centrally located opening (7) and multiple openings (4) of sizes 1 mm to 2.5 mm diameter, and wherein the multiple openings are at angles of 10 to 50 to the wall surfaces, the separation wall (3) is followed by a cavity (8) having a centrally located outlet opening (6) in its end wall (5), both the centrally located opening (7) and the multiple openings (4) extends between an inlet port (2) and the cavity (8), the end wall is located opposite the separation wall (3) containing both the centrally located opening (7) and the multiple openings (4), wherein the at least one low pressure water mist nozzle is configured such that the separation wall is insertable into the nozzle housing through an opening opposite the end wall (5), wherein the end wall and the housing are monolithic, and wherein the centrally located outlet opening (6) of the end wall (5) has a continuous nozzle surface defining an increasing cross-sectional area, and wherein the continuous nozzle surface is curved radially outwardly relative to a longitudinal axis of the nozzle.

5. A fire protection system comprising: at least one low pressure water mist nozzle in operable communication with a water supply configured to supply water through said at least one low pressure water mist nozzle at supply water pressures of 0.5 bar to 20 bars, wherein the low pressure water mist nozzle has a housing and a single separation wall (3) having both a centrally located opening (7) and multiple openings (4) of sizes 1 mm to 2.5 mm diameter, and wherein the multiple openings are at angles of 10 to 50 to the wall surfaces, the separation wall (3) is followed by a cavity (8) having a centrally located outlet opening (6) in its end wall (5), both the centrally located opening (7) and the multiple openings (4) extends between an inlet port (2) and the cavity (8), the end wall (5) is located immediately downstream of the separation wall (3) containing both the centrally located opening (7) and the multiple openings (4), wherein the cavity (8) has a diameter and a length defined between the separation wall and the end wall, wherein the length exceeds the diameter, wherein the end wall and the housing are monolithic, and wherein the centrally located outlet opening (6) of the end wall (5) has a continuous nozzle surface defining an increasing cross-sectional area, and wherein the continuous nozzle surface is curved radially outwardly relative to a longitudinal axis of the nozzle.

Description

(1) The above mentioned problem has been solved in low pressure water mist nozzles having water deflectors surfaces, on which the kinetic water energy transform water with small supply pressures into sprays consisting of small water droplets. A problem with water mist nozzles having deflectors is that the nozzles become sensitive to physical impacts, which may displace the positions of deflector surfaces to the orifices supplying water on to the deflector surfaces. Another problem with deflector water mist nozzles is to be able to transform water sprays into a fine droplet size distribution pattern, being ideal for fire protection.

(2) The purpose of the present invention is to supply a practical solution to the above mentioned problems.

(3) The invention differs from known low pressure water mist nozzles for active fire protection by, internally in the nozzle housing, to house a swivel plate having multiple 1 mm to 2.5 mm openings in angles of 10-50 to the swivel plate surfaces, and a downstream swivel chamber having a central opening in the wall opposite the swivel plate.

(4) A variant of the invention is characterized by the outlet opening of the swivel chamber having a size of 1.5 mm to 3 mm. This allows adjustments of water flow and water distribution angle from the nozzle.

(5) Another variant of the invention is characterized by having a centrally located opening in the swivel plate. The opening makes the nozzle have full cone water distribution.

(6) A third variant of the invention is characterized in that the outlet opening of the swivel chamber has an increasing cross section diameter. Hereby the spray angle of the low pressure water mist nozzle is increased.

(7) FIG. 1 shows an example of the invention. (1) is a threaded connection to the agent supply pipe system. (2) is the agent supply inlet port. (3) is an agent swivel plate. (4) is angled openings in the agent swivel plate. (7) is a centrally located opening in the swivel plate. (5) is the nozzle housing. (8) is the agent swivel chamber and (6) is the exit opening of the swivel chamber, having an increasing cross-sectional area.

(8) The invention performs with that the agent (water) having low supply pressures at 0.5 bar to 20 bars flows through the inlet port (2) into the nozzle housing. Here the agent flows through the angled openings (4) in the swivel plate (3) which transforms the agent jets, which rotates the agent staying in the swivel chamber (8). The friction between agent jets from the angle openings (4), and agent jet from the centre opening (7), makes the agent jet from the central opening (7) rotate. The agent flows from the swivel chamber (8) through the central exit opening (6) having an increasing cross-sectional area allowing the agent to rotate through the opening. This results in a large distribution area of the agent water mist spray.