Bypass swirl-bubble atomization type low pressure water mist nozzle

Abstract

The invention relates to a novel bypass vortex-bubble atomizing type low-pressure fine-spray firefighting sprayer suitable for places such as bullet trains, belongs to the technical field of firefighting, and mainly aims to overcome the defects that current common fine-spray sprayers are small in atomizing radius, small in atomizing taper angle, insufficient in radial momentum, large in spray particles, incapable of saving water, and the like. The novel bypass vortex-bubble atomizing type low-pressure fine-spray firefighting sprayer has the advantages that gas injection holes can be closed to allow the sprayer to be used as a single water-current firefighting sprayer, a large jet flow taper angle and high water current sucking ability outside the sprayer are achieved, and a large-range atomizing space can be formed easily; water currents can be fully mixed inside the sprayer in a vortex manner by the aid of three obliquely-connected bypass tubes, water spray momentum can be radially increased favorably, and accordingly the firefighting range is expanded; the energy of the water currents is fully utilized, and water saving of the sprayer is achieved due to the fact that bypass water comes from the incoming flow of the sprayer; in addition, the sprayer using the bubble atomizing technology is efficient and energy saving.

Description

technical field [0001] The invention relates to a low-pressure water mist nozzle, in particular to a novel low-pressure fine water mist fire extinguishing nozzle. Background technique [0002] At present, for fine water mist fire extinguishing nozzles, there are few theoretical and experimental research results, and there has been no conclusion about which nozzle structure is more suitable for fire extinguishing. At present, the fogging technologies adopted by various fine water mist fire extinguishing nozzles mainly include impact effect, centrifugal effect, bubble atomization, multi-stage atomization, two-fluid atomization, ultrasonic atomization, electrostatic atomization, etc., but these fog There are also many deficiencies in the modernization methods, and the fine water mist nozzles with different working pressure levels also have their own disadvantages, specifically: [0003] 1. The nozzle flow path of the high-pressure water mist nozzle is often easily blocked, and...

AI Technical Summary

Problems solved by technology

[0005] (1). This structure greatly increases the fluid movement resistance, consumes a lot of energy, and easily leads to low water mist injection speed, and a large number of mist droplets cannot reach the surface or root of the fire plume smoothly, making the fire extinguishing effect of the fine water mist nozzle worse. Especially in low pressure water mist fire extinguishing system

[0006] (2). The structure of the swirl core is complex. Adding the swirl core increases the complexity of the structure of the nozzle body, increases the manufacturing cost, and the size of the fine water mist nozzle is small

Limited by the size of the swirl core and the difficulty of processing, the number of processed swirl core nozzles is limited, which reduces the fire extinguishing radius of this type of nozzle

[0007] (3). The equivalent size of the flow channel of the swirl core is small, and if the filtering effect of the incoming flow is not good, it is easy to cause blockage

[0008] 3. The droplet size produced by the fine water mist nozzle with metal disc and coil spring structure is often larger, and there are also disadvantages of the swirl core nozzle

[0009] 4. For the most widely used centrifugal water mist nozzles, if the centrifugal force is too large, it is likely that the axial momentum of the sprayed water mist will be insufficient and the radial momentum will be too large, resulting in uneven distribution of the characteristics of the mist field. On the premise that the spray intensity of fine water mist meets the requirements of fire extinguishing, the uniform distribution of fine water mist spray intensity is conducive to water saving and can greatly shorten the fire extinguishing time, but the situation when the centrifugal force of this kind of nozzle is too large is obviously not conducive to Creates a uniform spray intensity

[0010] 5. Traditional fine water mist nozzles often rely on the energy given by the outside world to drive the atomization, and cannot make full use of the energy of the water itself

[0011] 6. The application range of traditional fine water mist nozzles is narrow, and the nozzles cannot be flexibly converted; there are few additional accessories

[0014] Invented a new type of low-pressure fine water mist nozzle suitable for motor vehicles and other places, mainly to solve the current common fine water mist nozzles with small atomization radius, small atomization cone angle, insufficient radial momentum, large droplet particles, Deficiencies such as not saving water

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