Centrifugal jet nozzle

 

(57) Abstract:

The invention relates to a power system, in particular to nozzles for spraying liquids, and can be applied, for example, in cooling towers and other industrial facilities that require spraying water or other liquids. Peripheral channels is inclined to the longitudinal axis of the nozzle at an angle equal to 5 - 30oand variable cross-section or rectangular, or round, or oval in shape with an area decreasing in the direction of fluid between the cylindrical insert and a narrowing tapered bore mounted remote ring, inlet fitting and remote ring partially overlapping the cross-section of the channels, respectively, at their inputs and outputs, forming a loose bushing section, the area of free flow area at the inlet of each channel is equal to the area of free flow area at its output. The invention improves the quality of atomization of the liquid and injector performance. 6 C.p. f-crystals, 3 ill.

The invention relates to a power system, in particular to nozzles for spraying liquids, and can be applied, for example, in cooling towers, as well as other Premysl case, satirically cylindrical chamber with a conical bore ending in a cylindrical nozzle, savariaud insert with a Central cylindrical bore and inclined peripheral grooves.

(see and.with. USSR N 503600, IPC B 05 B 1/34, F 23 D 11/04, 1976)

The disadvantage of this injector is the low quality of atomization is supplied agent.

Closest to the present invention is a centrifugal-jet nozzle, comprising a housing, satirically cylindrical chamber with a conical bore ending in a cylindrical nozzle, flat cylindrical savariaud insert with a Central cylindrical bore and a peripheral inclined channels, inlet fitting, a supporting box.

(see RF patent N 2010613, IPC B 05 B 1/34, 1994).

The disadvantage of this injector is the low quality of atomization of the liquid due to the low turbulence coming out zavihriteljami camera stream.

The objective of the invention is to improve the quality of atomization of the liquid, the performance of the injector.

The problem is solved in that the peripheral channels is inclined to the longitudinal axis of the nozzle under UHL what Amadu, decreasing in the direction of fluid between the cylindrical insert and a narrowing tapered bore mounted remote ring, inlet fitting and remote ring partially overlapping the cross-section of the channels, respectively, at their inputs and outputs, forming a loose bushing section, the area of free flow area at the inlet of each channel is equal to the area of free flow area at its output, the ratio of the sum of squares of free flow areas of the channels to the cross-sectional area of the center hole is equal to 4.3.

The ratio of the cross-sectional area of each channel at the entrance to the cross-sectional area at the outlet is greater than 1 but less than 2.

The height h distance rings is 0,075 - 0,16 of the height of the insert.

The inner diameter d of the distance ring is 0,85 - 0,95 from diameter DCamzavihriteljami camera.

The angle of taper of the conical hole is determined by the ratio 0o< 60o.

The centerline of the channel inserts can be made either straight or helical.

This embodiment of the nozzle allows to increase the productivity of the nozzle 10-20 % for MF is erinya inclined channels determined experimentally and depends on the specified opening angle of the torch and the performance of the nozzle. The angles that are outside the defined experimentally, does not allow to obtain the desired angle of the torch raspisivaem fluid while maintaining homogeneity and uniform distribution of droplets in the spray nozzle. The angle less than 5ogives the angle of the spray close to the spray jet nozzle, i.e., no more than 15 - 20oand the angle of inclination of more than 30oleads to an increase in pressure loss with increasing angle . This, in turn, leads to a sharp decrease in the performance of the injector.

Inlet fitting, backing flat cylindrical savariaud box, at the same time reduces the cross section of the peripheral inclined channels at the entrance, and further expansion of the channels at high pressures can lead to cavitation phenomena, and this, in turn, to significant hydraulic resistance, dramatically reduce performance, especially for large heads. The equality of the areas of the free flow cross sections at the input and output of each peripheral inclined channel, you can eliminate the imbalance of fluid flow in various sections of flat cylindrical Savicheva insert.

Distanoe camera, which allows the best way to connect to the stream passing through the Central hole and inclined peripheral channels, and on the other hand, creates a turbulizing step, allowing to reduce the volume-surface diameter drops without pressure loss and the performance of the nozzle. To create uniformity filled spray nozzles optimal ratio of the sum of squares of the free flow cross-sections of the peripheral inclined channels (fto) to area (fabout) cross-section of the center hole, using well-known theoretical and experimental data is determined by the ratio 5 > fabout/ fabout> 4.

On the basis of the number of experiments empirically it was found that when the ratio of the sum of squares of the free flow cross-sections of the peripheral inclined channels to the cross-sectional area of the Central hole, equal to 4.3, dispersion is achieved when the dimensions of the average diameter of the drops of 0.5 - 0.8 mm for 90% of the total volume of liquid.

With respect to the cross-sectional area of each of the peripheral inclined channel at the entrance to the cross-sectional area at the outlet more than 1 but smaller than 2 is achieved optimally is icoty flat cylindrical Savicheva insert, and with an inner diameter of distance rings constituting 0,85 - 0,95 from diameter zavihriteljami cylindrical chamber, an optimum amount of turbulence at the outlet of the channel.

When the angle of taper of the conical holes 0o< 60ooptimum turbulization miscible flows.

The relative angle of the narrowing of the peripheral inclined channel can be determined from the formula

< / BR>
where DCam- diameter zavihriteljami cylindrical chambers;

DPCs- inner diameter of the inlet fitting;

H - the height of the flat cylindrical Savicheva insert.

Distance ring, on the one hand, creates additional volume in conical hole zavihriteljami camera, which allows the best way to connect to the stream passing through the Central hole and the peripheral inclined channels, and on the other hand, creates a turbulizing step, allowing to reduce the volume-surface diameter drops without loss of pressure and performance of the injector.

In Fig. 1 shows a nozzle, a longitudinal section; Fig. 2 - section a-a in Fig. 1; Fig. 3 - section b-B in Fig. 1.

Centrale what kind of camera 3 with the conical bore 4, passing in a cylindrical nozzle 5, a flat cylindrical savariaud box 6 with a Central cylindrical bore 7 and a peripheral inclined channels 8 cross-section or rectangular, or round, or oval shaped and the inlet fitting 9, propping up the box 6. Peripheral channels 8 is inclined to the longitudinal axis of the nozzle at an angle equal to 5 - 30oand AC-sectional area decreasing in the direction of the fluid. Between the cylindrical insert 6 and the conical hole 4 set distance ring 10, the inlet fitting 9 and the distance ring 10 are partially overlapped cross-section of the channels 8, respectively, at their inputs and outputs, creating a free flow cross-section (through which the fluid), the area of free flow area at the inlet of each channel 8 is equal to the area of free flow area at its output, the ratio of the sum of squares of the free flow cross sections of the channels 8 to the cross-sectional area of the Central hole 7 of the insert is equal to 4.3.

The ratio of the cross-sectional area of each channel 8 at the entrance to the cross-sectional area at the outlet is greater than 1 but less than 2. The height h distance ring 10 SOS the diameter DCamzavihriteljami camera 3. The angle of taper of the conical hole 4 is determined by the ratio 0o< 60o. The centerline of the channels 8 of the insert 6 can be made either straight or helical.

The nozzle operates as follows.

Liquid is supplied through the supply nozzle 9 into the working chamber 2. When a sudden expansion of the flow at the transition from free flow area at the entrance to the transverse input section of each peripheral inclined channel or rectangular, or round, or oval cross-section is formed local vortex, the turbulent flow at the inlet. A further part of the fluid passes through the peripheral inclined channels 8 flat cylindrical Savicheva insert 6, forming a rotating flow. Another part of the fluid passes through the Central hole 7 of a flat cylindrical Savicheva insert 6, forming a continuous stream, while its diameter should be slightly larger than the diameter of the internal thread, rotating in the nozzle 5. The output of inclined channels 8 on the remote ring 10 stream additionally turbulizers that improves the uniformity and quality of the spray. As a result of interaction of the rotating liquid is spun CENTR">

Distance ring 10 perform a height in the range of 1-10 mm and a wall thickness of 0.5 to 5.0 mm, Such dimensions are determined experimentally and depend on the diameter of the nozzle of the injector and its performance. Outside these dimensions the efficiency of the nozzle decreases sharply.

The invention allows to significantly improve the performance of the nozzle, creating a spray of liquid with an angle in the range 30 - 80o, i.e., to create the optimal characteristics torch for use in high-speed flow of the spray apparatus (ejection cooling tower with a different location of the nozzles, the nozzle Venturi absorbers).

1. Centrifugal jet nozzle for spraying a liquid, comprising a housing, satirically cylindrical chamber with a conical bore ending in a cylindrical nozzle, flat cylindrical savariaud insert with a Central cylindrical bore and a peripheral inclined channels, inlet fitting, supporting the insert, characterized in that the peripheral channels is inclined to the longitudinal axis of the nozzle at an angle equal to 5 - 30oand variable cross-section or rectangular, or round, or the camping tapered bore mounted remote ring, the inlet fitting and remote ring partially overlapping the cross-section of the channels, respectively, at their inputs and outputs, forming a loose bushing section, the area of free flow area at the inlet of each channel is equal to the area of free flow area at its output, the ratio of the sum of squares of free flow areas of the channels to the cross-sectional area of the center hole is equal to 4.3.

2. Nozzle under item 1, characterized in that the ratio of the cross-sectional area of each channel at the entrance to the cross-sectional area at the outlet is greater than 1 but less than 2.

3. Nozzle under item 1, characterized in that the height of the distance ring is 0,075 - 0,16 of the height of the insert.

4. Nozzle under item 1, characterized in that the inner diameter of the distance ring is 0,85 - 0,95 from diameter zavihriteljami camera.

5. Nozzle under item 1, characterized in that the angle of taper of the conical hole is determined by the ratio 0o< 60o.

6. Nozzle under item 1, characterized in that the centerline of the channel insert is made straightforward.

7. Nozzle under item 1, characterized in that the centerline of the channel insert is made of screw

 

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FIELD: oil and gas industry.

SUBSTANCE: in end piece, flow conic slit-like channel of variable section is made screwed with rotation of longitudinal axis for angle 20-60. Section at output is decreased in comparison to input in 1.5-3 times.

EFFECT: higher efficiency.

3 dwg

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