阅读说明：本技术 涂料无气喷涂用旋流式喷嘴及涂料无气喷涂方法 (Spiral-flow type nozzle for coating airless spraying and coating airless spraying method ) 是由 姜海 郑立本 杜新亮 郭金宝 付友 焦海林 王春奇 李学光 于 2019-10-14 设计创作，主要内容包括：本发明提出一种涂料无气喷涂用旋流式喷嘴及涂料无气喷涂方法,属于涂料喷涂技术领域。本涂料无气喷涂用旋流式喷嘴,直筒段侧壁的上端设置进料段,直筒段腔体与进料段腔体连通,进料段腔体的内径小于直筒段腔体的内径,进料段腔体沿着直筒段腔体的切向布置,直筒段的下端设置收缩段,收缩段腔体内径从上向下逐渐收缩,直筒段腔体与收缩段腔体连通,直筒段腔体下端开口与收缩段腔体上端开口对齐,直筒段的轴线与收缩段的轴线重合,收缩段的下端设置喷出嘴,收缩段腔体与喷出嘴连通,收缩段腔体下端开口与喷出嘴上端开口对齐。本发明的有益效果：涂料从喷出嘴的四周均匀喷出,析出涂料中空气,实现无气喷涂。(The invention provides a spiral-flow type nozzle for airless spraying of a coating and an airless spraying method of the coating, and belongs to the technical field of coating spraying. This coating is swirl nozzle for airless spraying, the upper end of straight section of thick bamboo lateral wall sets up the feed segment, straight section of thick bamboo cavity and feed segment cavity intercommunication, the internal diameter of feed segment cavity is less than the internal diameter of straight section of thick bamboo cavity, the feed segment cavity is arranged along the tangential of straight section of thick bamboo cavity, the lower extreme of straight section of thick bamboo sets up the shrink section, shrink section cavity internal diameter from the top down shrinks gradually, straight section of thick bamboo cavity and shrink section cavity intercommunication, straight section of thick bamboo cavity lower extreme opening aligns with shrink section cavity upper end opening, the axis of straight section of thick bamboo and the axis coincidence of shrink section, the lower extreme of shrink section sets up the blowout nozzle, shrink section cavity and blowout nozzle intercommunication, shrink section cavity lower extreme opening aligns with blowout nozzle upper end opening. The invention has the beneficial effects that: the coating is uniformly sprayed out from the periphery of the spraying nozzle, and air in the coating is separated out, so that airless spraying is realized.)

1. The utility model provides a coating airless is swirl nozzle for spraying which characterized in that: including the feed section, the straight section of thick bamboo section, shrink section and blowout nozzle, straight section of thick bamboo section cavity is cylindric structure, the upper end of straight section of thick bamboo section lateral wall sets up the feed section, the feed section cavity is cylindric structure, straight section of thick bamboo cavity and feed section cavity intercommunication, the internal diameter of feed section cavity is less than the internal diameter of straight section of thick bamboo cavity, the feed section cavity is arranged along the tangential of straight section of thick bamboo cavity, the lower extreme of straight section of thick bamboo section sets up the shrink section, shrink section cavity internal diameter from the top down shrinks gradually, straight section of thick bamboo cavity and shrink section cavity intercommunication, straight section of thick bamboo cavity lower extreme opening aligns with shrink section cavity upper end opening, the axis of straight section of thick bamboo coincides with the axis of shrink section, the lower extreme of shrink section sets up the blowout nozzle, shrink section cavity and blowout nozzle intercommunication, shrink section cavity lower extreme opening aligns with blowout nozzle.

2. The swirl nozzle for airless spraying of paint according to claim 1, wherein: a plurality of bulges are arranged on the inner wall of the spraying nozzle in an encircling way at equal intervals.

3. The swirl nozzle for airless spraying of paint according to claim 2, wherein: the two sides of the bulge are symmetrical cambered surfaces.

4. The swirl nozzle for airless spraying of paint according to claim 3, wherein: the cambered surface is an arc surface which is concave towards the bulge.

5. The swirl nozzle for airless spraying of paint according to claim 2, wherein: the bulges are connected into a whole and are arranged in central symmetry.

6. The swirl nozzle for airless spraying of paint according to claim 2, wherein: the number of the bulges is five, and the section of the ejection nozzle is in a five-petal plum blossom shape.

7. The swirl nozzle for airless spraying of paint according to claim 1, wherein: the contraction section cavity is of an inverted frustum-shaped structure.

8. The swirl nozzle for airless spraying of paint according to claim 1, wherein: the lower extreme of straight section of thick bamboo is provided with the assembly ear, and the upper end of shrink section is provided with down the assembly ear, and the assembly ear is as an organic whole through the bolt assembly with lower assembly ear on going up.

9. The swirl nozzle for airless spraying of paint according to claim 8, wherein: the upper assembling lugs are annular and are arranged around the straight cylinder section; the lower assembling lugs are annular and are arranged around the periphery of the contraction section; the bolts are multiple and are arranged at equal intervals around the axis of the straight cylinder section.

10. An airless paint spraying method is characterized in that: applying the swirl nozzle for airless spraying of a paint according to any one of claims 1 to 9, the method of airless spraying of a paint comprising the steps of:

step one, pressing each component of the coating into a feeding section at a set pressure, enabling the coating to enter a cavity of a straight cylinder section through the feeding section along the tangential direction of the cavity of the straight cylinder section, and enabling the coating to rotate at the upper part in the cavity of the straight cylinder section so as to enable each component of the coating to be subjected to the action of a shearing force to realize primary mixing;

secondly, under the action of gravity and centrifugal force, the coating spirally moves downwards to a contraction section in the cavity of the straight cylinder section, the shearing force applied to the coating in the cavity of the contraction section is increased, and the rotation speed of the coating is increased more and more, so that the components of the coating are mixed for the second time;

in the first step and the second step, the coating rotates along the inner walls of the cavities of the straight cylinder section and the contraction section to form a spiral downward outer rotational flow, the outer rotational flow forms a spiral upward inner rotational flow at the axis of the straight cylinder section and the axis of the contraction section after running to the contraction section, a columnar negative pressure area is formed inside the inner rotational flow, and air in the coating is separated out and enters the negative pressure area to form an air column;

and step three, the coating continues to enter the spraying nozzle along the outer rotational flow and is sprayed out from the periphery of the spraying nozzle, and the air column enters the spraying nozzle and is sprayed out from the center of the spraying nozzle.

Technical Field

The invention relates to the technical field of paint spraying, in particular to a spiral-flow type nozzle for airless paint spraying and an airless paint spraying method.

Background

The coating nozzle is used for spraying fine coating liquid particles from the nozzle under certain pressure. The existing paint nozzle is composed of a valve body, a valve core, a liquid inlet channel and a spray hole, and the flow of paint is controlled by opening and closing the valve core and the valve body. In the existing paint spray nozzle, the paint is sprayed out from a spray hole of the spray nozzle in a straight line, and the sprayed paint contains air bubbles, so that the atomization effect of the paint is poor, the spraying area is small, and the sprayed surface is uneven. In addition, the existing coating nozzle has the disadvantages of complex structure, poor assembly manufacturability and higher cost.

Disclosure of Invention

The invention aims to provide a spiral-flow type nozzle for airless spraying of a coating and an airless spraying method of the coating, which can realize uniform spraying of the coating from the periphery of a spraying nozzle, and can separate out air in the coating to realize airless spraying.

The invention provides a spiral-flow type nozzle for coating airless spraying, which comprises a feeding section, a straight cylinder section, a contraction section and a spraying nozzle, wherein a cavity of the straight cylinder section is of a cylindrical structure, the upper end of the side wall of the straight cylinder section is provided with the feeding section, a cavity of the feeding section is of a cylindrical structure, a cavity of the straight cylinder section is communicated with the cavity of the feeding section, the inner diameter of the cavity of the feeding section is smaller than that of the cavity of the straight cylinder section, the cavity of the feeding section is arranged along the tangential direction of the cavity of the straight cylinder section, the lower end of the straight cylinder section is provided with the contraction section, the inner diameter of the cavity of the contraction section is gradually contracted from top to bottom, the cavity of the straight cylinder section is communicated with the cavity of the contraction section, the opening at the lower end of the cavity of the straight cylinder section is aligned with the opening at the upper end of the cavity of the contraction section, the axis of the straight.

Further, a plurality of protrusions are arranged on the inner wall of the spraying nozzle in a surrounding mode at equal intervals.

Furthermore, two sides of the protrusion are symmetrical cambered surfaces.

Further, the cambered surface is an arc surface which is concave towards the protrusion.

Furthermore, the bulges are connected into a whole, and are arranged in central symmetry.

Furthermore, the number of the bulges is five, and the section of the ejection nozzle is in a quincuncial shape.

Further, the contraction section cavity is of an inverted frustum-shaped structure.

Furthermore, the lower end of the straight cylinder section is provided with an upper assembling lug, the upper end of the contraction section is provided with a lower assembling lug, and the upper assembling lug and the lower assembling lug are assembled into a whole through a bolt.

Furthermore, the upper assembling lug is annular and is arranged around the straight cylinder section; the lower assembling lugs are annular and are arranged around the periphery of the contraction section; the bolts are multiple and are arranged at equal intervals around the axis of the straight cylinder section.

The invention also provides an airless paint spraying method, which applies the spiral-flow type nozzle for airless paint spraying and comprises the following steps:

step one, pressing each component of the coating into a feeding section at a set pressure, enabling the coating to enter a cavity of a straight cylinder section through the feeding section along the tangential direction of the cavity of the straight cylinder section, and enabling the coating to rotate at the upper part in the cavity of the straight cylinder section so as to enable each component of the coating to be subjected to the action of a shearing force to realize primary mixing;

secondly, under the action of gravity and centrifugal force, the coating spirally moves downwards to a contraction section in the cavity of the straight cylinder section, the shearing force applied to the coating in the cavity of the contraction section is increased, and the rotation speed of the coating is increased more and more, so that the components of the coating are mixed for the second time;

in the first step and the second step, the coating rotates along the inner walls of the cavities of the straight cylinder section and the contraction section to form a spiral downward outer rotational flow, the outer rotational flow forms a spiral upward inner rotational flow at the axis of the straight cylinder section and the axis of the contraction section after running to the contraction section, a columnar negative pressure area is formed inside the inner rotational flow, and air in the coating is separated out and enters the negative pressure area to form an air column;

and step three, the coating continues to enter the spraying nozzle along the outer rotational flow and is sprayed out from the periphery of the spraying nozzle, and the air column enters the spraying nozzle and is sprayed out from the center of the spraying nozzle.

Compared with the prior art, the spiral-flow type nozzle for airless spraying of the coating and the airless spraying method of the coating have the following characteristics and advantages:

the spiral-flow type nozzle for airless spraying of the coating has the advantages of simple structure, convenience in assembly and lower cost;

the spiral-flow type nozzle for coating airless spraying and the coating airless spraying method have the advantages that after the coating sequentially passes through the feeding section, the straight cylinder section and the contraction section, air in the coating is separated out and enters the negative pressure area to form an air column, the air column enters the spraying nozzle and is sprayed out from the center of the spraying nozzle, the coating enters the spraying nozzle and is sprayed out from the periphery of the spraying nozzle, the sprayed coating is free of air doping, airless spraying is realized, the atomization effect of coating spraying is obviously improved, the spraying area is large, and the spraying surface is uniform.

The features and advantages of the present invention will become more apparent from the detailed description of the invention when taken in conjunction with the drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a swirler for airless spraying of a coating in an embodiment;

FIG. 2 is a cross-sectional view of a swirler for airless spraying of paint in an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, a preferred embodiment of a swirl nozzle for airless spraying of a paint according to the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and fig. 2, the present embodiment provides a swirl nozzle for airless spraying of paint, which comprises a feeding section 1, a straight section 2, a contracting section 3 and a nozzle 4. The feeding section 1 and the straight cylinder section 2 are integrally formed, and the contraction section 3 and the spray nozzle 4 are integrally formed.

The cavity of the straight cylinder section 2 is of a cylindrical structure, the upper end of the side wall of the straight cylinder section 2 is provided with the feeding section 1, the cavity of the feeding section 1 is of a cylindrical structure, and the cavity of the straight cylinder section 2 is communicated with the cavity of the feeding section 1. The inner diameter of the cavity of the feeding section 1 is smaller than that of the cavity of the straight cylinder section 2, and the cavity of the feeding section 1 is arranged along the tangential direction of the cavity of the straight cylinder section 2. The coating enters the cavity of the straight cylinder section 2 from the feeding section 1 along the tangential direction of the cavity of the straight cylinder section 2 and continues to rotate at the upper part in the cavity of the straight cylinder section 2, so that the components of the coating are preliminarily mixed.

The lower end of the straight cylinder section 2 is provided with an upper assembling lug, the upper end of the contraction section 3 is provided with a lower assembling lug, and the upper assembling lug and the lower assembling lug are assembled into a whole through a bolt 8 so that the lower end of the straight cylinder section 2 is assembled with the contraction section 3. Wherein, the upper assembling lug is annular and is arranged around the straight cylinder section 2; the lower assembling lugs are annular and are arranged around the contraction section 3; the bolts 8 are multiple, and the multiple bolts 8 are arranged at equal intervals around the axis of the straight cylinder section. The straight cylinder section 2 and the contraction section 3 are assembled through the upper assembly lug, the lower assembly lug and the bolt 8, so that the nozzle is convenient to disassemble, assemble and maintain.

The cavity internal diameter of shrink section 3 is from the top down and is reduced gradually, and the cavity of shrink section 3 in this embodiment is back frustum-shaped structure. The cavity of the straight cylinder section 2 is communicated with the cavity of the contraction section 3. The lower end opening of the cavity of the straight cylinder section 2 is aligned with the upper end opening of the cavity of the contraction section 3, and the axis of the straight cylinder section 2 is coincided with the axis of the contraction section 3. Under the action of gravity and centrifugal force, the coating spirally moves downwards in the cavity of the straight cylinder section 2 to the contraction section 3, and the rotation speed of the coating is increased in the cavity of the contraction section 3, so that the secondary mixing of the components of the coating is realized.

The coating rotates along the inner walls of the cavities of the straight cylinder section 2 and the contraction section 3 to form an outer spiral flow 5 in a spiral downward direction, an inner spiral flow 6 in a spiral upward direction is formed at the axial line of the straight cylinder section 2 and the axial line of the contraction section 3 after the outer spiral flow 5 runs to the contraction section 3, a columnar negative pressure area is formed inside the inner spiral flow 6, and air in the coating can be separated out and enter the negative pressure area to form an air column 9.

The lower extreme of shrink section 3 sets up blowout nozzle 4, and the cavity and the blowout nozzle 4 intercommunication of shrink section 3, the cavity lower extreme opening of shrink section 3 and 4 upper end openings of blowout nozzle align.

The paint continues to enter the nozzle 4 along the outer swirl flow 5 and is ejected from the periphery of the nozzle 4, and the air column 9 enters the nozzle 4 and is ejected from the center of the nozzle 4.

In this embodiment, a plurality of protrusions are circumferentially arranged on the inner wall of the ejection nozzle 4 at equal intervals. When the coating flows around the spraying nozzle 4, the coating is scattered by the bulges, so that the sprayed coating is more uniform. Preferably, the two sides of the bulge are symmetrical cambered surfaces, so that the bulge in the shape has a good effect of scattering the coating, and the spraying area is large; more preferably, the cambered surface is an arc surface which is concave towards the protrusion, so that the effect of scattering the paint and the spraying area are better. On the basis, the bulges are connected into a whole and are arranged in central symmetry, so that the bulges are convenient for machining.

In this embodiment, the number of the protrusions is five, and the cross section of the nozzle 4 is in a quincuncial shape, so that the optimal solution of this embodiment is that the effect of scattering the coating is the best, the sprayed coating is uniform, the spraying area is large, and the mechanical processing is convenient.

The embodiment also provides an airless paint spraying method, which is implemented by applying the spiral-flow type nozzle for airless paint spraying, and comprises the following steps:

step one, pressing the component A and the component B of the coating into a feeding section 1 by a pump at a set pressure, mixing air in the coating in the pressing process of the component A and the component B of the coating, enabling the coating to enter a cavity of a straight cylinder section 2 through the feeding section 1 along the tangential direction of the cavity of the straight cylinder section 2, and enabling the coating to rotate at the upper part in the cavity of the straight cylinder section 2 so as to enable the component A and the component B of the coating to be subjected to the action of a shearing force to realize primary mixing;

secondly, under the action of gravity and centrifugal force, the coating spirally moves downwards in the cavity of the straight cylinder section 2 to the contraction section 3, the shearing force borne by the coating is increased in the cavity of the contraction section 3, and the rotating speed (tangential speed) of the coating is increased more and more, so that the component A and the component B of the coating are secondarily mixed;

in the first step and the second step, the coating rotates along the inner walls of the cavities of the straight cylinder section 2 and the contraction section 3 to form a spiral downward outer rotational flow, the outer rotational flow forms a spiral upward inner rotational flow at the axial line of the straight cylinder section 2 and the axial line of the contraction section 3 after running to the contraction section 3, a columnar negative pressure area is formed inside the inner rotational flow, and air in the coating is separated out and enters the negative pressure area to form an air column 9;

and step three, the coating continues to enter the spraying nozzle 4 along the outer rotational flow and is sprayed out from the periphery of the spraying nozzle 4, and the air column 9 enters the spraying nozzle 4 and is sprayed out from the central position of the spraying nozzle 4 to be uniformly sprayed on the surface of the material 7 to be sprayed.

The paint airless spraying method of the embodiment applies the spiral-flow type nozzle for airless spraying of the paint of the embodiment, the paint sequentially passes through the feeding section 1, the straight cylinder section 2 and the contraction section 3, so that air in the paint is separated out and enters the negative pressure area to form the air column 9, the air column 9 enters the spray nozzle 4 and is sprayed out from the center of the spray nozzle 4, the paint enters the spray nozzle 4 and is sprayed out from the periphery of the spray nozzle 4, the sprayed paint is free of air doping, airless spraying is achieved, the atomization effect of paint spraying is remarkably improved, the spraying area is large, and the spraying surface is uniform.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.