JPH0576547U - Nozzle for atomizer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a nozzle for a spraying device, which does not cause dew condensation on the surface or adhesion of powder even when mounted in a device in which high humidity and powder are scattered. [Structure] At least a gas supply line (1), a gas ejection port (2), a liquid supply line (3), and a liquid ejection port (4)
In the nozzle for a spraying device consisting of the gas supply pipeline (1) and the liquid supply pipeline (3), part or all of their outer circumferences are covered by a gas supply pipeline (5) with a closed outer tube (5). 1) and the outer circumference of the liquid supply line (3) and the outer tube (5) are covered with a gap formed with a closed air layer (6).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nozzle for a spraying device having a simple structure, which does not cause the powder to adhere to the surface even when used in high humidity and when the powder is scattered.

[0002]

[Prior Art]

 When granulating powder or spray-drying a solution sample, it is necessary to atomize a liquid such as water or solution with a gas such as air in a granulator or a spray dryer. Although nozzles for atomizers are widely used, conventional nozzles for atomizers generally have a structure including at least a gas supply conduit, a gas ejection outlet, a liquid supply conduit, and a liquid ejection outlet.

On the other hand, powder is scattered at a high concentration in the granulating device or the spray drying device in which the nozzles for the spraying device are arranged, and the humidity is also high. The gas such as air passing through the gas supply pipeline in the nozzle for the spraying device arranged in the above-mentioned granulating apparatus or the liquid such as water passing through the liquid supply pipeline is higher than the internal temperature of the above-mentioned granulating apparatus. In many cases, the surface temperature of the gas supply line and the liquid supply line is lower than the internal temperature of the above-mentioned granulating device and the like.

Since conventional nozzles for sprayers do not take measures against the above-mentioned temperature difference, dew condensation occurs on the surfaces of the gas supply line and the liquid supply line, and as a result, they are re-scattered and scattered in the device. The phenomenon that the powder present adhered to the surface occurred frequently. In addition, the adhered powder fell off in a flaky form when it reached a certain thickness, and it was mixed into granular or powdered products, causing many troubles.

[0005]

[Problems to be solved by the device]

 In view of the above-mentioned conventional techniques and problems, the present invention has a high humidity and does not cause dew condensation or powder adhesion on the surface of the spray device nozzle even when used in the presence of powder scattering, and has a simple structure. An object is to provide a nozzle for a spraying device.

[0006]

[Means for Solving the Problems]

 Next, the device of the present invention devised to solve the above problems will be described. The elements of the present invention have the same reference numerals as the elements of the embodiment in order to facilitate comparison with the elements of the embodiment described later. The numbers in parentheses are added. The reason why the present invention is described in correspondence with the reference numerals of the embodiments described later is to facilitate understanding of the present invention and not to limit the scope of the invention of the present application to the embodiments.

In order to solve the above-mentioned problems, the present invention is for a spraying device comprising at least a gas supply line (1), a gas ejection port (2), a liquid supply line (3) and a liquid ejection port (4). In the nozzle, part or all of the outer circumferences of the gas supply pipeline (1) and the liquid supply pipeline (3) are the outer circumferences of the gas supply pipeline (1) and the liquid supply pipeline (2) and the outer tube (5). ) Is a nozzle for a spraying device, characterized in that it is covered with a closed outer tube (5) at the end that is spaced apart to form a closed air layer (6) between the nozzle and the outer tube.

In the present invention, the gas supply conduit (1) and the liquid supply conduit (3) [up to the gas ejection port (2) or the liquid ejection port (4)] may be independent conduits. Alternatively, the gas supply pipe line (1) and the liquid supply pipe line (3) may have a double pipe structure with the liquid supply pipe line (3) as a central part. A valve for stopping the flow of the liquid may be provided in the liquid supply pipe (3) or at a position near the liquid ejection port (4). The gas supply line (1) and the liquid supply line (3) or the outer tube (5) closed at the end of the double-pipe structure line, and the gas supply line (1) And a space for forming a closed air layer (6) between the outer circumference of the liquid supply line (3) and the outer tube (5). As a result, a closed air layer (6) is formed between the gas supply line (1) and the liquid supply line (3) and the outer tube (5), and the heat insulation effect of the air layer (6) forms the outer layer. The surface temperature of the tube is almost the same as the internal temperature of the granulator, etc., and despite its extremely simple structure, it reliably prevents dew condensation on the surface, and powder adhesion and falling off due to dew condensation are eliminated, and it frequently occurs in conventional equipment. I was able to completely prevent the trouble I had.

[0009]

【Example】

 Example A device shown in FIG. 1 was prototyped. FIG. 1 is a longitudinal sectional view showing an example of a spray nozzle of the device of the present invention. The liquid supply conduit (3) and the gas supply conduit (1) were of a double pipe structure having the liquid supply conduit (3) at the center. An air layer (6) sealed between the outer circumference of the double-pipe structure pipeline and the outer jacket (5) is provided by a jacket tube (5) having a closed end at the outer circumference of the double-pipe structure pipeline. The tube was covered with a gap to form a triple tube. The gas ejection port (2) and the liquid ejection port (4) were nozzles of a normal structure in which the liquid was supplied to the center and the gas was ejected from the outer periphery of the liquid toward the center.

The batch fluidized bed type milk powder granulator was equipped with the above-mentioned spraying device to spray water to fluidize the milk powder, thereby granulating the milk powder. Repeat the four-step cycle of "milk powder preparation", "granulation (formation of powdered milk fluidized bed and water spray from sprayer)", "preliminary drying", "discharging semi-finished product (preliminary dried product)", After continuous batch operation for 4 days (96 hours), almost no adhesion of rewound raw material milk powder to the mantle tube was observed.

[0011]

[Effect of the device]

 The effects of the present invention are as follows. (1) A nozzle for a spraying device that does not cause dew condensation or powder adhesion on the surfaces of the liquid supply line and the gas supply line. (2) Simple structure and easy maintenance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment which is an embodiment of the spraying device of the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Gas Supply Pipeline 2 Gas Jet Port 3 Liquid Supply Pipeline 4 Liquid Jet Port 5 Mantle Tube 6 Thermal Insulation Layer

Claims (1)

[Scope of utility model registration request] 1. At least a gas supply line, a gas ejection port,
In a sprayer nozzle including a liquid supply pipeline and a liquid jet outlet, a part or all of the outer circumferences of the gas supply pipeline and the liquid supply pipeline are the outer circumference of the gas supply pipeline and the liquid supply pipeline and the outer tube. Nozzle for a spraying device, characterized in that it is covered at its distal end with a gap to form a closed air layer between it and a closed outer tube.