JPS5888513A - Sprayer - Google Patents

Abstract

PURPOSE:To obtain smaller particles of liquid at a blocking member, by raising the temperature of a liquid ejected from a small hole of a nozzle toward the blocking member by a heating means. CONSTITUTION:A blocking member 3 is disposed on the downstream side of a nozzle 1 having a small hole 2 in the manner that it is located at a predetermined distance from the nozzle 1, while a liquid pressurizing pump 4 and a liquid tank 5 connected by a pipe are disposed on the upstream side of the nozzle 1. Liquid ejected from the nozzle 1 by the pump 4 is formed into either of three flow patterns, smooth flow, vibration flow and divided flow, according to the shape of the small hole 2, speed of the liquid flow, etc. The jet flow of the liquid impinges onto a blocking member 3, produces various vibration waves near the impinging point, and produces finely divided particles of liquid from the top of the vibration waves. Thus, since smaller particles of liquid can be obtained by use of the blocking member 3 and they are heated on the downstream side of the pressuring pump, it is prevented that the pressurizing pump is heated to a high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact atomization type spraying device (τ) in which a liquid is pressurized and a jet stream ejected linearly from a pore of a nozzle is applied to an impactor to crush and atomize the liquid. The purpose is to reduce fluctuations in spray particle size due to changes in liquid temperature.

In general, fine particles produced by collision tend to increase in particle size as the liquid temperature decreases, so they cannot be used in devices where changes in particle size are a problem. For example, when used in a liquid fuel combustion device, when the temperature of fuel oil decreases, the viscosity increases logarithmically, and as the viscosity increases, the liquid becomes less likely to split into fine particles after collision.

In other words, in order to overcome the increase in viscosity, particles with larger mass are more likely to be generated. Therefore, by using this collisional atomization method, large particles are generated at low temperatures, so large particles that are difficult to float in the air flow settle in the premixture, and the spray is transported to the combustion section. The amount will decrease.

The present invention eliminates these conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a nozzle having a pore 2, and a collision body 3 is disposed downstream of the nozzle 1 at a predetermined interval. A liquid pressure pump 4 and a liquid tank 5 are provided upstream of the nozzle 1 and connected by a pipe.

The straight jet flow ejected from the pressurizing pump 4 shows three types of patterns: smooth flow, turbulent flow, and split flow depending on the shape of the pores 2, jet speed, etc., and this jet flow hits the impactor 3. When the collision occurs, various vibration waves are induced in the vicinity of the collision point, and fragmented particles are generated from the tips of the vibration waves.

Therefore, in order to generate a large amount of fine particles on the collision body 3,
(1) There are two possible ways to do this: to make the vibration waves stronger, and to split the particles from the wave front of the 2Ji dynamic waves.

Therefore, lowering the viscosity of the liquid will be effective against the above two points.

That is, a low-viscosity liquid enables large wave motion without attenuating vibrational waves, and the intermolecular attraction that acts against the splitting of the wave crest is weak, so that particles can easily be split from the wave crest.

To explain the behavior in this case in detail, the wave front tends to split due to the momentum of the wave and the surface tension of the liquid, and the viscosity of the liquid opposes this. Therefore, a low-viscosity liquid not only easily splits into fine particles, but also splits into small particles with small mass, that is, small diameter particles.

The embodiment of the present invention focuses on the effect of reducing the viscosity of the liquid, and by providing a heating device 6 upstream of the nozzle 1 that heats the liquid to a certain temperature in advance to reduce the viscosity, the amount of fine particles generated can be reduced. This makes it possible to increase the average diameter, reduce the average diameter, and prevent fluctuations in spray characteristics due to fluctuations in liquid temperature.

Furthermore, the heating device 8 must not heat the liquid above its boiling point under atmospheric pressure. In other words, since the liquid in the nozzle 1 is pressurized, it remains in a liquid phase even if heated above the boiling point, but if it reaches atmospheric pressure downstream of the nozzle 1, it will boil under reduced pressure and become effectively linear. This is because the collision object cannot reach 3.

Also, according to the inventor's experiments, since the jet flow is extremely high-speed, there is almost no temperature drop up to the impactor 3, and even if the heating device 6 is provided upstream of the nozzle 1, the fine particles at the downstream impactor 3 will not decrease. It turned out to be effective for Further, the heating device 6 is a heater having positive resistance characteristics, and the heating device 6 is a heater having positive resistance characteristics.
The liquid passing through is kept constant.

As described above, the present invention uses a heating device to increase the temperature of the liquid ejected from the pores of the nozzle toward the colliding body, so it is possible to form smaller particles in the colliding body, and the liquid is heated downstream of the pressure pump. Therefore, the pressure pump does not heat up.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention. 1. Nozzle, 2. Pore, 3.
, , , , Colliding body 1.4 , , , , Pressure pump,
5 , , , , liquid tank, 6 ... heating device 0

Claims (2)

[Claims] (1) Is there liquid between the path between the nozzle that makes the liquid jetted from the pore impinge on the colliding body and the liquid pressurizing pump? Spray device equipped with a heating device. (2) The snow blowing device according to claim 1, wherein the liquid heating device is constituted by a heater having positive resistance characteristics.