JPH11138057A - Atomizing plate for rotary atomizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a rotary atomizer to be continuously operated for a long time by reducing the grinding wear of an ejection face around a jet nozzle and improving the durability of an atomizing plate to delay its replacement time. SOLUTION: The ejection face 20h of the atomizing plate 20 is formed spherically with one point on the axial line of an output shaft on which the atomizing plate 20 is mounted, being set as a center O and the outer periphery of the ejection face 20h from the center O, as a radius. In addition, ejection nozzles 21 to be mounted into the mounting holes 20f of the atomizing plate 20 are arranged radially from the center and the outer edges of the ejection lateral end faces of the ejection nozzles 21 are mounted on the inner edges of the mounting holes 20f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprayer for a rotary atomizer used in a gas-liquid contacting device such as a combustion exhaust gas treatment device or a spray dryer used for drying and granulating processes of foodstuffs and the like.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 9-75658, for example, a combustion exhaust gas treatment apparatus is provided with a lower case of a rotary atomizer protruding into a chamber, and a combustion chamber containing harmful substances in the chamber. Introducing exhaust gas,
The output shaft of the high-speed rotation mechanism of the rotary atomizer main body protrudes from the lower end of the lower case, and the spray disk attached to the output shaft tip rotates at high speed. The harmful substance absorbent is atomized and sprayed, and the harmful substance in the exhaust gas is absorbed and removed as a reaction product in the process of bringing the absorbent into contact with exhaust gas and evaporating and solidifying the absorbent. Spray dryers for drying and granulating ceramics, foodstuffs, pharmaceuticals, etc.
A liquid or slurry-like raw material is atomized and sprayed from a spraying board, and dried by a high-temperature gas in a chamber.

[0003] This sprayer is disclosed, for example, in JP-A-7-328.
As shown in Japanese Patent No. 489, a plurality of mounting nozzles are mounted on a plurality of mounting holes opened on a disk-shaped and cylindrical discharging surface, and the mounting holes are connected to the mounting holes so that the discharging nozzles do not come off by centrifugal force. The nozzle has a conical shape in which the diameter on the inner peripheral side of the spray plate is larger than the diameter on the outer peripheral side. In addition, as a countermeasure against abrasion due to atomized substances sprayed by centrifugal force, the spraying board itself is formed of a material with high wear resistance, quenching is performed on the contact surface with the substance, and coating is applied by spraying ceramics. Or Further, the injection nozzle uses ceramics having high wear resistance.

[0004]

However, the conventional spraying pan has a plurality of mounting holes opened in the cylindrical spraying surface, and the spraying nozzle having a flat spraying end face is mounted on the spraying nozzle. When the ejection side end face of the spray nozzle is fitted with the vertical end face of the mounting hole, which is the axial direction of the spray nozzle, the left and right end faces of the spray nozzle, which is the circumferential direction of the spray board, protrude from the spray face of the spray board. When the ejection side end face of the ejection nozzle is attached to the left and right end faces of the hole so as to be coincident with each other, the upper and lower end faces of the ejection nozzle are depressed inward from the ejection face of the spray plate.

[0005] As described above, if there are irregularities around the injection nozzle on the injection surface, the atomized substance sprayed by itself or the atomized substance sprayed by the injection nozzle in front of the spraying plate in the rotation direction, or
The combined effect of the gas flow in the chamber causes the spray surface around the spray nozzle to be shaved, causing a weight imbalance with respect to the spray plate axis. In addition, a weight imbalance of the spraying board also occurs due to the reaction product adhering to the spraying board. In particular, as in the case of a combustion exhaust gas treatment apparatus, when the spraying board is rotated in a high-heat and strongly acidic atmosphere, corrosion is generated in the shaved portion and the corrosion progresses, and a hole may be formed in the spraying board.

[0006] The weight imbalance of the sprayer causes abnormal vibration of the output shaft, and when the abnormal vibration approaches the natural frequency of the output shaft, resonance occurs. To prevent damage, measures have been taken, such as providing a shaft coupling between the gearbox of the rotary atomizer and the output shaft. In addition, since the spray form around the spray nozzle is shaved, the spray form of the atomized substance cannot be kept in a steady state, so that the reaction state or the drying becomes uneven, which leads to the unevenness of the treatment or the product.

[0007] For this reason, the nebulizer must be replaced frequently, and the replacement operation is a large-scale operation of stopping the operation of the entire apparatus and removing the rotary atomizer from the chamber.

Accordingly, the present invention enables a rotary atomizer to operate continuously for a long period of time by reducing abrasion of the injection surface around the injection nozzle, improving durability of the spray plate and delaying replacement time. It is an object of the present invention to provide a rotary atomizer spray board that stabilizes the spray form of an atomized substance and increases the throughput.

[0009]

According to a first aspect of the present invention, there is provided a rotary atomizer body comprising: a plurality of mounting holes that are formed in a spray surface; In a spray plate of a rotary atomizer attached to the output shaft tip of a rotating mechanism, the shape of the spray surface is formed as a spherical surface having a center on one point on the axis of the output shaft and a radius from the center to the outer periphery of the spray surface. In addition, the injection nozzle is arranged radially from the center, and the outer edge of the injection-side end face of the injection nozzle is mounted so as to coincide with the inner edge of the mounting hole. The ejection-side end face is formed to have the same spherical shape as the shape of the ejection face. In the means of claim 3, the ejection nozzle is provided with a step in the direction of the output axis of the ejection face. Only characterized in that arranged double column,
The means of claim 4 is characterized in that the spray board is divided into a boss mounted on the output shaft and a body to which the spray nozzle is mounted. Is integrally molded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIGS. 1 to 4 show a first embodiment of the present invention, in which a gas-liquid contact device 1 has a funnel-shaped support portion 3 at an upper portion of a chamber 2,
A rotary atomizer 4 is installed on the support section 3, and a gas introduction path 5 for reacting or drying by contacting the atomized substance sprayed by the rotary atomizer 4 is provided along the support section 3 outside the support section 3. It is formed towards.

The rotary atomizer 4 is installed by mounting a mounting plate 6 on the support portion 3. The rotary atomizer 4 has a cylindrical upper case 7 detachably provided above the mounting plate 6, and a rotary atomizer 4. A main case 9 is constituted by an inverted conical lower case 8 which is detachably provided at a lower portion of the plate 6 and protrudes into the chamber 2, and a drive motor 10 is provided above the main case 9.

A speed increasing mechanism connected to the output shaft of the drive motor 10 is built in a cylindrical case 11 detachably provided in the upper case 7, and the drive motor 10 and the speed increase mechanism form a high-speed rotation mechanism. The lower case 8 has a double structure of an inner lubricating oil tank 12 and a cooling chamber 13 on the outer side of the lubricating oil tank 12. A supply pipe 14 and an air supply pipe 16 from a high-pressure air supply device 15 are provided.

The output shaft 17 of the high-speed rotating mechanism protruding from the lower portion of the cylindrical case 11 has a cylindrical portion 18 formed in the lubricating oil tank 12 and an output shaft formed in the lower case 8 below the lubricating oil tank 12. Through the hole 19 and the lower case 8
The spray board 20 is attached to the tip projecting from the lower end.

The spray board 20 is obtained by dividing a boss 20a attached to the output shaft 17 and a main body 20b detachably attached to the boss 20a. A protective cap 20c is provided at the lower center of the main body 20b. It is screwed.

The main body 20b has a jet supply chamber 20d inside.
Are formed, a plurality of injection nozzle mounting holes 20f are formed in the side wall 20e of the injection material supply chamber 20d, and a ceiling 20g whose central portion is opened inward from the side wall 20e extends to be sprayed at the ceiling 20g. It is configured to cover the upper part of the material supply chamber 20d, and is formed by integral molding such as shaving.

The outer peripheral side of the side wall 20e is a jetting surface 20h. The shape of the jetting surface 20h is such that a point on the axis of the output shaft 17 is the center O, and the outer periphery of the jetting surface 20h from the center O is a radius. The plurality of ejection nozzle mounting holes 20f have a diameter on the side of the ejected material supply chamber 20d on the ejection surface 2d.
It has a conical shape with a diameter larger than the diameter on the 0h side, and is arranged radially from the center O at equal intervals.

The outside of the bottom of the main body 20b and the outside of the protective cap 20c are formed in a streamlined manner so that a gas flow for reaction or drying introduced into the chamber 2 flows smoothly.

The injection nozzle 21 has an injection hole 21a,
It is attached to the injection nozzle mounting hole 20f, and, like the injection nozzle mounting hole 20f, has a conical shape in which the diameter of the spray supply chamber side end surface 21b is larger than the diameter of the injection side end surface 21c,
The injection-side end face 21c is formed to be flat, and the injection-side end face 21c is formed.
nozzle mounting hole 2 opening the outer edge of the nozzle c to the injection surface 20h
It is mounted in the injection nozzle mounting hole 20f so as to be aligned with the inner edge of 0f and to make the axis of the injection hole 21a orthogonal to the axis of the output shaft 17 in the horizontal direction.

As described above, the injection surface 20h of the injection plate 20 is formed into a spherical surface, and the outer edge of the injection-side end surface 21c of the injection nozzle 21 is made to coincide with the inner edge of the injection nozzle mounting hole 20f opened in the injection surface 20h. Since the ejection side end face 21c of the ejection nozzle 21 does not protrude from the ejection surface 20h of the ejection board 20 or the hollow of the ejection nozzle mounting hole 20f is formed, the ejection board 20 is rotated at high speed and atomized by centrifugal force. Even when the substance is sprayed, the spray flow of the atomized substance and the turbulence and the vortex of the gas flow in the chamber 2 do not occur, and the jet surface 20h around the jet nozzle 21 may be shaved due to a combined effect of these. Reduced.

Incidentally, the ejection side end face 21c of the ejection nozzle 21 is formed in the same spherical surface as the ejection face 20h of the ejection board 20, and the outer edge of the ejection side end face 21c of the ejection nozzle 21 coincides with the inner edge of the ejection nozzle mounting hole 20f. By mounting, the ejection surface 20h of the ejection plate 20 becomes a perfect spherical surface, which brings more effect. However, as in the above embodiment, the ejection nozzle 2
Forming the one jet-side end face 21c as a plane is easier and more cost-effective.

Further, by forming the outside of the bottom of the main body 20b of the injection plate 20 and the outside of the protective cap 20c in a streamlined manner, the processing gas flow introduced into the chamber 2 is smoothly formed along the outside of the injection plate 20. The flow and the entrainment flow due to the processing gas flow are not generated outside the injection plate 20, and the products and the like floating in the chamber 2 are prevented from adhering to the outside of the injection plate 20.

Accordingly, the weight imbalance with respect to the axis of the injection plate 20 is reduced, abnormal vibration of the output shaft 17 is less likely to occur, and damage to the output shaft 17 and bearings is reduced.
In addition, since the ejection surface 20h of the ejection plate 20 is reduced, the durability of the ejection plate 20 is improved, the replacement time can be delayed, and the long-term continuous operation of the gas-liquid contact device 1 is enabled. At the same time, the spraying form of the atomized substance can be stabilized to increase the throughput.

Further, since the spraying plate 20 is divided into the boss portion 20a and the main body 20b, the boss portion 20a and the main body 20b can be processed independently, so that the processing becomes easy and only the main body 20b which is affected by abrasion can be processed. Since an expensive material may be used, the cost can be reduced, and at the time of replacement work, only the main body 20b needs to be replaced. Moreover, by integrally molding the main body 20b, the ceiling part conventionally bolted to the side wall as a separate upper lid can be changed to the ceiling part 20g continuous with the side wall 20e, and a bolt hole is formed in the side wall 20e. Since the necessity is eliminated, the thickness of the side wall 20e can be determined in terms of strength, the side wall 20e can be minimized, the injection nozzle 31 can be shortened, the number of parts can be reduced and the weight can be reduced, and the output shaft can be reduced. 17 and bearings can be reduced.

FIG. 5 shows a second embodiment of the present invention. The spraying plate 30 has a spray surface 30a formed into a spherical surface as in the first embodiment, and the spray surface is formed on the upper surface of the spray surface 30a. A plurality of injection nozzles 31 whose holes are oriented in a horizontal direction with the axis of the hole orthogonal to the axis of the output shaft 17 are radially mounted from the center O at equal intervals, and the lower part of the injection surface 30 a between the adjacent injection nozzles 31. A plurality of injection nozzles 32 are mounted radially at equal intervals with the axis of the injection holes obliquely downward from the center O, and the injection nozzles 31 and 32 are staggered in the direction of the output axis axis of the injection surface 30a. It is arranged in a shape.

FIG. 6 shows a third embodiment of the present invention. A spraying plate 40 has a spray surface 40a formed in a spherical shape as in the first embodiment, and a spray surface is formed on the spray surface 40a. A plurality of injection nozzles 41 oriented horizontally with the axis of the hole orthogonal to the axis of the output shaft 17 are mounted at equal intervals radially from the center O, and an injection surface 40a below the injection nozzle 41 is provided.
A plurality of injection nozzles 42 are mounted radially at equal intervals with the axis of the injection holes obliquely downward from the center O, and the injection nozzles 41, 42 are arranged in two rows with a step in the direction of the output axis of the injection surface. Have been placed.

As described above, the spray surfaces 3 of the spray boards 30 and 40
0a, 40a are formed as spherical surfaces, and the injection nozzles 31, 32,
By arranging 41 and 42 in multiple rows, not only the number of injection nozzles increases but also the amount of spraying of the atomized substance increases, and the amount of spraying can be made uniform. The centrifugal force due to the high-speed rotation greatly affects the horizontal spray nozzles 31 and 41. However, the greater the supply pressure of the spray or the greater the specific gravity of the spray, the greater the inertia of the flow of the spray and the greater the centrifugal force. Overcoming, the main stream of the flow flows along the lower surface of the spray boards 30, 40, and the injection nozzles 32,
It is useful to spray the atomized substance obliquely downward of the chamber 2 because the processing amount of 42 becomes large. still,
The arrangement of the injection nozzles is not limited to the above-described second and third embodiments, but may be a combination of the staggered arrangement of the second embodiment and the two-row arrangement of the third embodiment.

FIG. 7 shows that the rotary atomizer 4 is installed at the upper part of the chamber 50, and the processing gas is introduced upward from the inlet pipe 51 provided at the middle part of the chamber 50 toward the rotary atomizer 4. The fourth embodiment of the present invention has a configuration in which the processing gas is discharged from the discharge pipe 52 and the product is taken out from the bottom of the chamber 50. In such a configuration, the present invention is similar to the above-described embodiments. In particular, the spray plate 2
Since the bottom outer side of the main body 20b and the outer side of the protective cap 20c are formed in a streamlined manner, the gas flow of the processing gas introduced from the introduction pipe 51 toward the spraying board 20 flows smoothly. And the reaction products can be reduced from adhering to the outside of the bottom of the main body 20b of the spray panel 20 and the protective cap 20c.

[0028]

As described above, according to the first aspect of the present invention, the spray atomizer of the rotary atomizer is configured such that the shape of the spraying surface of the sprayer is adjusted to one point on the axis of the output shaft to which the sprayer is attached. With the center being formed as a spherical surface whose radius is the outer circumference of the injection surface from the center, the injection nozzle mounted on the mounting hole of the spraying plate is arranged radially from the center, and the outer edge of the injection side end face of the injection nozzle is set as the inner edge of the mounting hole. Since the nozzles are mounted in alignment, the injection-side end face of the injection nozzle does not protrude from the injection surface of the injection plate, and the mounting holes do not dent.
Even if the atomizing substance is sprayed by centrifugal force by rotating the spray plate at high speed, the spray flow of the atomizing substance and the turbulence and vortex of the gas flow in the chamber do not occur, and the combined effect of these causes It is reduced that the jet surface around the nozzle is shaved,
Adhesion of reaction products to the injection plate is also reduced, weight imbalance with respect to the axis of the injection plate is reduced, abnormal vibration of the output shaft is less likely to occur, and damage to the output shaft and bearings is reduced. In addition, the durability of the spray plate is improved, the replacement time can be delayed, the long-term continuous operation of the gas-liquid contact device is possible, and the spray form of the atomized substance is stabilized to increase the throughput. Can be. According to the second aspect of the present invention, since the ejection side end face of the ejection nozzle is formed to have the same spherical shape as the shape of the ejection face, the ejection face of the ejection plate becomes a perfect spherical surface, which provides further effects.

Furthermore, in the means according to the third aspect, the injection nozzles are arranged in a double row with a step in the direction of the axis of the output shaft of the injection surface, so that the number of injection nozzles increases and the spraying amount of the atomized substance is reduced. In addition to the increase, the spray amount can be made uniform.
According to the fourth aspect of the present invention, the spraying plate is divided into a boss portion attached to the output shaft and a main body to which the spray nozzle is mounted, so that the boss portion and the main body can be processed independently, which facilitates the processing. At the same time, it is only necessary to use an expensive material only for the body affected by wear, so that cost reduction can be achieved,
At the time of replacement work, only the main body needs to be replaced. Moreover,
By integrally molding the main body, the number of parts can be reduced and the weight can be reduced, and the load on the output shaft, bearings, and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a spray board showing a first embodiment of the present invention.

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

FIG. 3 is a front view of a rotary atomizer.

FIG. 4 is a schematic diagram of a gas-liquid contact device.

FIG. 5 is a partial cross-sectional view of a spray pan showing a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view of a spray pan showing a third embodiment of the present invention.

FIG. 7 is a schematic view of a gas-liquid contact device showing a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas-liquid contact device, 2 ... Chamber, 4 ... Rotary atomizer, 17 ... Output shaft, 20 ... Spray board, 20a ... Boss part of spray board 20, 20b ... Body of spray board 20, 20f ... Injection nozzle mounting hole, 20h: injection surface, 21: injection nozzle,
21a: injection hole of injection nozzle 21, 21c: injection-side end face of injection nozzle 21, 30, 40: injection nozzle, 31, 3
2, 41, 42 ... injection nozzle

Claims (5)

[Claims] An injection nozzle is mounted on each of a plurality of mounting holes opened on an injection surface, and in a spray plate of a rotary atomizer attached to a tip end of an output shaft of a high-speed rotation mechanism of a rotary atomizer body, the shape of the injection surface is A point on the axis of the output shaft is defined as a center, and a spherical surface whose radius is the outer periphery of the injection surface from the center is formed. The injection nozzles are arranged radially from the center, and an outer edge of an injection side end surface of the injection nozzle. A rotary atomizer spraying plate, wherein the nozzle is fitted so as to match the inner edge of the mounting hole. 2. A spray plate for a rotary atomizer according to claim 1, wherein the spray-side end surface of said spray nozzle is formed in the same spherical shape as the shape of said spray surface. 3. The spray plate for a rotary atomizer according to claim 1, wherein the spray nozzles are arranged in multiple rows with a step in the axial direction of the output shaft of the spray surface. 4. The rotary according to claim 1, wherein said spray disk is divided into a boss portion attached to said output shaft and a main body to which said spray nozzle is mounted. Sprayer for atomizer. 5. A spray plate for a rotary atomizer according to claim 4, wherein a main body of said spray plate is formed integrally.