阅读说明：本技术 一种用于粉末喷涂装置的喷嘴及粉末喷涂装置 (Nozzle for powder spraying device and powder spraying device ) 是由 张卫 于 2019-12-12 设计创作，主要内容包括：本发明提供了一种用于粉末喷涂装置的喷嘴及粉末喷涂装置,其包括外套和固定在外套内的内芯,外套与内芯之间形成供粉末通过的空腔,外套的侧壁上设有进气孔,内芯的内部沿轴向设有气流通道,气流通道与进气孔连通,内芯的底面上设有与气流通道连通的喷气口。使用时,在喷涂粉末的同时,向进气孔内通入压缩空气,压缩空气依次流经进气孔和气流通道后,从喷气口喷出,来填充因喷粉喷气在内芯底部产生的负压形成的空穴,既可以吹散内芯底部还没有来得及粘附和积累的粉末,又可以冷却内芯,防止因内芯温升导致粉末更易粘附,从而保证内芯底部不出现粘粉和积粉掉落。(The invention provides a nozzle for a powder spraying device and the powder spraying device, which comprises an outer sleeve and an inner core fixed in the outer sleeve, wherein a cavity for powder to pass through is formed between the outer sleeve and the inner core, an air inlet hole is formed in the side wall of the outer sleeve, an airflow channel is axially arranged in the inner core and communicated with the air inlet hole, and an air nozzle communicated with the airflow channel is arranged on the bottom surface of the inner core. During the use, when the spraying powder, to letting in compressed air in the inlet port, compressed air flows through inlet port and air current channel back in proper order, from the jet-propelled mouth blowout, fills because of the cavity that the negative pressure that the jet-propelled produced in the inner core bottom of dusting formed, both can blow off the inner core bottom and not reach adhesion and the powder of accumulation yet, can cool off the inner core again, prevents to lead to the powder to change the adhesion because of the inner core temperature rise to guarantee that the inner core bottom does not appear gluing powder and long-pending powder drops.)

1. The nozzle for the powder spraying device is characterized by comprising an outer sleeve and an inner core fixed in the outer sleeve, wherein a cavity for powder to pass through is formed between the outer sleeve and the inner core, an air inlet hole is formed in the side wall of the outer sleeve, an air flow channel is axially arranged inside the inner core and communicated with the air inlet hole, and an air jet communicated with the air flow channel is formed in the bottom surface of the inner core.

2. A nozzle for a powder spray coating apparatus as recited in claim 1, wherein said outer sleeve is annular and said cavity is an annular cavity, and wherein an annular nozzle opening is formed between a bottom edge of said outer sleeve and a bottom edge of said inner core in communication with said cavity, said nozzle opening surrounding said nozzle opening.

3. The nozzle for powder coating apparatus of claim 1, wherein the outer sleeve comprises a first sleeve body and a second sleeve body that are separated from each other, the first sleeve body has a first through hole at the center thereof, the second sleeve body has a second through hole at the center thereof, and the air inlet hole is formed on the sidewall of the first sleeve body or the second sleeve body;

the nozzle for the powder spraying device further comprises a centering assembly, the centering assembly comprises a positioning cylinder and a positioning core which is fixed in the positioning cylinder and is coaxially arranged with the positioning cylinder, at least one axially-through feeding channel is arranged between the positioning cylinder and the positioning core, the upper end of the positioning cylinder is coaxially connected with the first sleeve, the lower end of the positioning cylinder is coaxially connected with the second sleeve, the feeding channel is communicated with the first through hole and the second through hole, an air inlet channel communicated with the air inlet hole is arranged in the centering assembly, and the air inlet channel is not communicated with the feeding channel;

the inner core is arranged in the second through hole, the upper end of the inner core is coaxially connected with the lower end of the positioning core, the cavity is formed between the inner core and the second sleeve body and is communicated with the feeding channel, and the airflow channel is communicated with the air inlet channel.

4. A nozzle for a powder spraycoating apparatus according to claim 3, wherein the air inlet passage is provided in a radial direction of the centering block, the air inlet passage radially passes through the positioning cylinder and extends inward to a center of the positioning core, a mounting hole is provided in the center of the positioning core in an axial direction, an upper end of the mounting hole is communicated with the air inlet passage, the mounting hole extends downward to a lower end surface of the positioning core, an upper end of the inner core has a plug-in post, the plug-in post is inserted and fixed in the mounting hole, and the air flow passage extends to a top surface of the plug-in post and is communicated with the air inlet passage through the mounting hole.

5. A nozzle for a powder spraycoating apparatus according to claim 3, wherein an annular groove is provided in an outer wall of the positioning cylinder in a circumferential direction, the number of the air inlet holes is plural, the plurality of the air inlet holes are all communicated with the annular groove, the number of the air inlet passages is plural, the plurality of the air inlet passages are all communicated with the annular groove, and the plurality of the air inlet holes and the plurality of the air inlet passages are one-to-one or are arranged in a staggered manner in a radial direction.

6. A nozzle for a powder coating apparatus as set forth in claim 3, wherein said positioning cylinder and said positioning core are connected by one or more wings, and when the number of said wings is plural, the plural wings are arranged at intervals in a circumferential direction of said positioning cylinder, and the plural wings divide an annular space between said positioning cylinder and said positioning core into plural said feed passages, said feed passage passing through said positioning cylinder and said wings in a radial direction.

7. A nozzle for a powder spray coating apparatus as set forth in claim 6, wherein said wings are provided obliquely with respect to a central axis of said positioning cylinder, and when said wings are plural in number, the inclination directions of the plural wings are the same.

8. The nozzle for powder coating apparatus according to claim 3, wherein the lower portion of the second sleeve body is a first divergent portion having a flared shape whose inner diameter is divergent in a powder flow direction, the lower portion of the inner core is a second divergent portion having an outer diameter divergent in the powder flow direction, and a nozzle opening is formed between a bottom edge of the first divergent portion and a bottom edge of the second divergent portion.

9. A nozzle for a powder spray coating apparatus as set forth in claim 3, wherein a lower stepped hole is provided at a center of a lower end of the first sleeve, an upper end of the positioning cylinder is inserted and fixed in the lower stepped hole, an upper stepped hole is provided at a center of an upper end of the second sleeve, and a lower end of the positioning cylinder is inserted and fixed in the upper stepped hole.

10. A nozzle for a powder spray coating apparatus as claimed in claim 3, wherein the top of the locating core is an upwardly pointed cone that extends out of the locating cylinder and into the first through-hole.

11. A nozzle for a powder spray coating apparatus as claimed in any one of claims 1 to 10, wherein the air ejection port is a tapered hole having an inner diameter which is gradually enlarged in the direction of the air flow.

12. A nozzle for a powder spray coating device as claimed in any one of claims 1 to 10, wherein the nozzle is made of a metallic conductive material.

13. A powder spray coating device comprising a nozzle according to any one of claims 1 to 12.

Technical Field

The invention relates to the technical field of powder spraying, in particular to a nozzle for a powder spraying device and the powder spraying device.

Background

The existing nozzle for the powder spraying device is composed of an outer sleeve and an inner core fixed in the outer sleeve, the outer sleeve and the inner core are of a rotary structure, a cavity is formed between the outer sleeve and the inner core, powder with static electricity and compressed air are mixed and then enter from an upper inlet of the nozzle, and the powder is sprayed out from a nozzle at the bottom of the cavity after passing through the cavity.

The existing nozzles for powder spraying devices have the following disadvantages:

1. when powder with static electricity is sprayed out of the nozzle, compressed air is pressurized at the upper part of the nozzle and in the cavity of the nozzle, and enters the atmospheric space after being sprayed out of the nozzle, the compressed air can expand rapidly, and the compressed air is sprayed out of the nozzle and diffuses rapidly, so that negative pressure cavities are generated at the bottom of the inner core;

2. in the process of the long-time powder of spouting of nozzle for powder spraying device, because there is the friction between powder and the nozzle, can make the inner core produce the temperature rise phenomenon, the powder is tacky under the higher condition of temperature, can glue easily on the bottom surface of inner core, has aggravated the adhesion of powder.

Due to the reasons, the powder can fall off due to gravity or uncertain external force after a long time when the attached powder is too much, if the product subjected to electrostatic powder spraying is positioned below the nozzle or in the powder spraying direction, large particles formed by powder accumulation can fall on a spraying piece or are blown to the sprayed product by compressed air sprayed by the nozzle, so that the surface of the sprayed product is uneven in powder attachment, and has silts or lumps, and unqualified products are produced.

Disclosure of Invention

The invention aims to provide a nozzle for a powder spraying device and the powder spraying device, and aims to solve the problem that powder is easy to adhere to the bottom surface of a core in the prior art.

In order to achieve the purpose, the invention provides a nozzle for a powder spraying device, which comprises an outer sleeve and an inner core fixed in the outer sleeve, wherein a cavity for powder to pass through is formed between the outer sleeve and the inner core, an air inlet hole is formed in the side wall of the outer sleeve, an air flow channel is axially arranged in the inner core and is communicated with the air inlet hole, and an air jet communicated with the air flow channel is formed in the bottom surface of the inner core.

The nozzle for the powder spraying device, wherein the outer sleeve is annular, the cavity is an annular cavity, an annular spraying port communicated with the cavity is formed between the bottom edge of the outer sleeve and the bottom edge of the inner core, and the spraying port surrounds the air jet.

The nozzle for the powder spraying device is characterized in that the outer sleeve comprises a first sleeve body and a second sleeve body which are arranged in a split manner, a first through hole which is axially communicated is formed in the center of the first sleeve body, a second through hole which is axially communicated is formed in the center of the second sleeve body, and the air inlet is formed in the side wall of the first sleeve body or the side wall of the second sleeve body; the nozzle for the powder spraying device further comprises a centering assembly, the centering assembly comprises a positioning cylinder and a positioning core which is fixed in the positioning cylinder and is coaxially arranged with the positioning cylinder, at least one axially-through feeding channel is arranged between the positioning cylinder and the positioning core, the upper end of the positioning cylinder is coaxially connected with the first sleeve, the lower end of the positioning cylinder is coaxially connected with the second sleeve, the feeding channel is communicated with the first through hole and the second through hole, an air inlet channel communicated with the air inlet hole is arranged in the centering assembly, and the air inlet channel is not communicated with the feeding channel; the inner core is arranged in the second through hole, the upper end of the inner core is coaxially connected with the lower end of the positioning core, the cavity is formed between the inner core and the second sleeve body and is communicated with the feeding channel, and the airflow channel is communicated with the air inlet channel.

The nozzle for the powder spraying device is characterized in that the air inlet channel is arranged along the radial direction of the centering assembly, the air inlet channel penetrates through the positioning cylinder along the radial direction and extends inwards to the center of the positioning core, the center of the positioning core is provided with a mounting hole along the axial direction, the upper end of the mounting hole is communicated with the air inlet channel, the mounting hole extends downwards to the lower end face of the positioning core, the upper end of the inner core is provided with a plug-in post, the plug-in post is inserted and fixed in the mounting hole, and the air flow channel extends to the top face of the plug-in post and is communicated with the air inlet channel through the mounting hole.

The nozzle for the powder spraying device is characterized in that an annular groove is formed in the outer wall of the positioning cylinder along the circumferential direction, a plurality of air inlets are formed in the outer wall of the positioning cylinder, the plurality of air inlets are communicated with the annular groove, a plurality of air inlet channels are formed in the outer wall of the positioning cylinder, the plurality of air inlets are communicated with the annular groove, and the plurality of air inlets and the plurality of air inlet channels are in one-to-one correspondence or staggered arrangement in the radial direction.

The nozzle for a powder spray coating device as described above, wherein the positioning cylinder and the positioning core are connected by one or more wings, and when the number of the wings is plural, the plurality of wings are arranged at intervals in the circumferential direction of the positioning cylinder, and the plurality of wings divide an annular space between the positioning cylinder and the positioning core into the plurality of feed channels, and the air inlet channel passes through the positioning cylinder and the wings in the radial direction.

The nozzle for a powder spray coating device as described above, wherein the plurality of flaps are provided obliquely with respect to the central axis of the positioning cylinder, and when the number of flaps is plural, the inclination directions of the plurality of flaps are the same.

The nozzle for the powder spraying device is characterized in that the lower part of the second sleeve body is a horn-shaped first gradually-expanding part with the inner diameter gradually expanding along the powder flow direction, the lower part of the inner core is a second gradually-expanding part with the outer diameter gradually expanding along the powder flow direction, and a spraying port is formed between the bottom edge of the first gradually-expanding part and the bottom edge of the second gradually-expanding part.

The nozzle for the powder spraying device is characterized in that a lower step hole is formed in the center of the lower end of the first sleeve, the upper end of the positioning cylinder is inserted into and fixed in the lower step hole, an upper step hole is formed in the center of the upper end of the second sleeve, and the lower end of the positioning cylinder is inserted into and fixed in the upper step hole.

The nozzle for the powder spraying device is characterized in that the top of the positioning core is a cone with an upward tip, and the cone extends out of the positioning cylinder and into the first through hole.

The nozzle for a powder spray coating device as described above, wherein the air ejection port is a tapered hole having an inner diameter gradually expanding in the air flow direction.

The nozzle for a powder spray coating device as described above, wherein the nozzle is made of a metallic conductive material.

The invention also provides a powder spraying device which comprises the nozzle.

The nozzle for the powder spraying device and the powder spraying device have the characteristics and advantages that:

1. the nozzle for the powder spraying device and the powder spraying device of the invention have the advantages that through arranging the air inlet hole on the side wall of the outer sleeve, an air flow channel communicated with the air inlet hole is arranged in the inner core, an air jet is arranged on the bottom surface of the inner core, when the powder is sprayed, compressed air is introduced into the air inlet, and after the compressed air flows through the air inlet and the air flow channel in sequence, the powder is sprayed out from the air nozzle to fill a cavity formed by negative pressure at the bottom of the inner core due to the spraying of the powder at the material spraying port and the air at the bottom of the inner core, so that the powder which is not adhered and accumulated at the bottom of the inner core can be blown away, the inner core can be cooled, the powder is prevented from being adhered more easily due to the temperature rise of the inner core, therefore, powder sticking and powder accumulation falling at the bottom of the inner core are avoided, powder lumps generated on the sprayed product due to the falling powder accumulation are avoided, the surface powder of the sprayed product is ensured to be uniform, and the reject ratio of the sprayed product is effectively reduced;

2. according to the nozzle for the powder spraying device and the powder spraying device, the centering assembly is arranged, when the nozzle is assembled, the first sleeve body, the second sleeve body and the inner core are coaxially connected together by directly adopting the centering assembly, so that the coaxial assembly of the outer sleeve and the inner core can be realized, the bottom edge of the outer sleeve and the annular bottom edge of the inner core can be ensured to be two concentric circles, the spraying port is ensured to be a circular ring with uniform ring width, the assembly operation is simple, convenient and quick, a tool does not need to be independently manufactured for assembly, a pin shaft hole does not need to be drilled, the workload and difficulty of processing and assembly are greatly reduced, and the cost is reduced.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is an assembly schematic of one embodiment of a nozzle for a powder spray coating device of the present invention;

FIG. 2 is an exploded schematic view of the nozzle of FIG. 1 for the powder spraycoating apparatus;

FIG. 3 is a schematic view of one embodiment of a centering assembly;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a top view of the centering assembly of fig. 3.

Main element number description:

1. a jacket;

11. an air inlet; 12. a first sleeve body; 121. a first through hole; 122. a lower step hole;

13. a second sleeve body; 131. a second through hole; 132. an upper stepped bore; 133. a first diverging section;

2. an inner core;

21. an air flow channel; 22. an air jet; 23. inserting the column; 24. a second diverging section;

3. a cavity;

31. a material spraying port;

4. a centering assembly;

41. a positioning cylinder; 411. an annular groove; 42. a positioning core; 421. mounting holes; 422. a cone;

43. a feed channel; 44. an air intake passage; 45. a wing plate.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, the present invention provides a nozzle for a powder spraying device, which comprises an outer sleeve 1 and an inner core 2 fixed in the outer sleeve 1, wherein a cavity 3 for powder to pass through is formed between the outer sleeve 1 and the inner core 2, an air inlet 11 is arranged on a side wall of the outer sleeve 1, an air flow channel 21 is axially arranged inside the inner core 2, the air flow channel 21 is communicated with the air inlet 11, and an air vent 22 communicated with the air flow channel 21 is arranged on a bottom surface of the inner core 2, that is, the air inlet 11, the air flow channel 21 and the air vent 22 are sequentially communicated so as to allow gas to flow through.

When the nozzle for the powder spraying device is used for spraying powder, the powder and compressed air are mixed and then enter from the upper inlet of the outer sleeve 1, pass through the cavity 3 and then are sprayed out from the space between the bottom end of the outer sleeve 1 and the bottom end of the inner core 2, meanwhile, compressed air is introduced into the air inlet hole 11 on the side wall of the outer sleeve 1, the compressed air is ejected from the air jet port 22 on the bottom surface of the inner core 2 after sequentially flowing through the air inlet hole 11 and the air flow channel 21, the negative pressure cavity at the bottom of the inner core 2 is filled, so that not only can powder which is not adhered and accumulated at the bottom of the inner core 2 be blown away, but also the inner core 2 can be cooled, the powder is prevented from being adhered more easily due to the temperature rise of the inner core 2, thereby guarantee that the powder is glued and the long-pending powder drops in 2 bottoms of inner core, avoid producing the powder tumor on the spraying product because of the long-pending powder that drops, guarantee that spraying product surface powder is even, effectively reduce the defective rate of spraying product.

The fixing connection mode of the outer sleeve 1 and the inner core 2 may be a pin connection, and of course, other connection modes may also be used, and the invention is not limited to this.

Specifically, the outer sleeve 1 is annular, the cavity 3 is an annular cavity, an annular spraying port 31 communicated with the cavity 3 is formed between the bottom edge of the outer sleeve 1 and the bottom edge of the inner core 2, the spraying port 31 surrounds the air jet 22, and powder is sprayed out from the spraying port 31.

As shown in fig. 1 and 2, the air nozzle 22 is a tapered hole with an inner diameter gradually expanding along the airflow direction, so that the diffusion effect is better when the compressed air is sprayed out, the powder at the bottom of the inner core 2 is more easily blown away, the powder is not accumulated at the bottom of the inner core 2, and the diffusion degree of the compressed air can be controlled by controlling the size or the taper angle of the tapered hole.

As shown in fig. 1 and 2, in a preferred embodiment, the outer jacket 1 and the inner core 2 are connected by the centering assembly 4, specifically, the outer jacket 1 includes a first jacket body 12 and a second jacket body 13 which are separately arranged, the first jacket body 12 is located above the second jacket body 13, a first through hole 121 which axially penetrates is formed in the center of the first jacket body 12, a second through hole 131 which axially penetrates is formed in the center of the second jacket body 13, the air inlet hole 11 is formed in a side wall of the first jacket body 12 or a side wall of the second jacket body 13, and in fig. 1, the air inlet hole 11 is formed in a side wall of the first jacket body 12;

the nozzle further comprises a centering assembly 4, the centering assembly 4 comprises a positioning cylinder 41 and a positioning core 42 which is fixed in the positioning cylinder 41 and is coaxially arranged with the positioning cylinder 41, at least one axially-through feeding channel 43 is arranged between the positioning cylinder 41 and the positioning core 42, the upper end of the positioning cylinder 41 is coaxially connected with the first sleeve 12, the lower end of the positioning cylinder 41 is coaxially connected with the second sleeve 13, the feeding channel 43 is communicated with the first through hole 121 and the second through hole 131, an air inlet channel 44 communicated with the air inlet hole 11 is arranged in the centering assembly 4, and the air inlet channel 44 is not communicated with the feeding channel 43;

the inner core 2 is arranged in the second through hole 131, the upper end of the inner core 2 is coaxially connected with the lower end of the positioning core 42, a cavity 3 is formed between the inner core 2 and the second sleeve body 13, the cavity 3 is communicated with the feeding channel 43, and the airflow channel 21 is communicated with the air inlet channel 44.

In the embodiment, the centering assembly 4 is arranged, and when the outer sleeve 1 and the inner core 2 are assembled, the first sleeve body 12, the second sleeve body 13 and the inner core 2 are coaxially connected together by directly adopting the centering assembly 4, so that the outer sleeve 1 and the inner core 2 can be coaxially assembled and automatically centered, the bottom edge of the outer sleeve 1 and the bottom edge of the inner core 2 are ensured to be two concentric circles, the spraying port 31 is ensured to be a circular ring with uniform ring width, the assembling operation is simple, convenient and rapid, a tool does not need to be independently manufactured to coaxially assemble the outer sleeve 1 and the inner core 2, a pin shaft hole does not need to be drilled to connect the outer sleeve 1 and the inner core 2, the workload and difficulty of processing and assembling are greatly reduced, and the; in the prior art, the centering assembly 4 is not arranged, a tool structure needs to be designed and manufactured before assembly, the outer sleeve 1 and the inner core 2 are assembled by adopting the tool structure, so that the inner core 2 and the outer sleeve 1 are coaxial, and the gap spacing (ring width) of the annular seam of the nozzle is consistent, so that the manufacturing cost and the assembly difficulty are increased; in addition, when the prior art adopts pin connection, a pin hole needs to be drilled, and the pin hole is very difficult to drill because the pin hole is in a slender shape;

in addition, the air inlet 11 and the air flow passage 21 can be communicated by arranging the centering assembly 4 and the air inlet passage 44 in the centering assembly 4, so that the air inlet passage 44 is more convenient to arrange.

As shown in fig. 1, 2 and 3, further, the air inlet channel 44 is arranged along the radial direction of the centering assembly 4, the air inlet channel 44 passes through the positioning cylinder 41 along the radial direction and extends inward to the center of the positioning core 42, the center of the positioning core 42 is provided with a mounting hole 421 along the axial direction, the upper end of the mounting hole 421 is communicated with the air inlet channel 44, the mounting hole 421 extends downward to the lower end surface of the positioning core 42, that is, the mounting hole 421 is a blind hole, the upper end of the inner core 2 is provided with the insertion column 23, the insertion column 23 is inserted and fixed in the mounting hole 421, the air flow channel 21 extends to the top surface of the insertion column 23 and is communicated with the air inlet channel 44 through the mounting hole 421, by arranging the mounting hole 421, the air flow channel 21 can be communicated with the air inlet channel 44, and the positioning core 42 and the inner core 2 can be connected and assembled together, the structure is simple, the processing is convenient, the assembly operation is, and good centering and positioning are realized.

For example, the inserting column 23 is cylindrical, the mounting hole 421 is a cylindrical hole, and the inserting column 23 is in interference fit with the mounting hole 421, so that the processing and the assembly are convenient, and air leakage can be avoided. However, the present invention is not limited thereto, and the plug 23 may be fixed to the mounting hole 421 by other means, such as screwing the plug 23 and the mounting hole 421.

As shown in fig. 1 and 3, further, an annular groove 411 is circumferentially arranged on an outer wall of the positioning cylinder 41, a plurality of air inlets 11 are provided, the plurality of air inlets 11 are all communicated with the annular groove 411, the plurality of air inlet passages 44 are all communicated with the annular groove 411, the plurality of air inlets 11 and the plurality of air inlet passages 44 are in one-to-one correspondence or staggered arrangement in a radial direction, the number of the air inlets 11 and the number of the air inlet passages 44 can be the same or different, the annular groove 411 is provided to communicate the plurality of air inlets 11 and the plurality of air inlet passages 44 through the annular groove 411, each air inlet 11 and each air inlet passage 44 can be radially aligned or can be staggered without alignment, so that the assembly operation is simpler and more convenient, the assembly difficulty is further reduced, in addition, by providing the annular groove 411, the compressed air in the annular groove 411 can enter from the plurality of air inlet passages 44, the gas is mixed in the mounting hole 421 and then is ejected from the gas ejection port 22, so that the gas flow direction is more stable and the diffusion effect is better. However, the present invention is not limited to this, and the outer wall of the positioning cylinder 41 may not be provided with the annular groove 411, and when assembling, the plurality of air inlet holes 11 and the plurality of air inlet passages 44 are aligned one by one in the radial direction, so that the plurality of air inlet holes 11 and the plurality of air inlet passages 44 are respectively communicated correspondingly.

As shown in fig. 3, 4 and 5, the positioning cylinder 41 and the positioning core 42 are further connected by one or more wing plates 45, when the number of the wing plates 45 is multiple, the plurality of wing plates 45 are arranged at equal intervals along the circumferential direction of the positioning cylinder 41, the plurality of wing plates 45 divide the annular space between the positioning cylinder 41 and the positioning core 42 into a plurality of feeding channels 43, and the air inlet channel 44 passes through the positioning cylinder 41 and the wing plates 45 in the radial direction. For example, the number of the vanes 45 is two, four or six, the number of the feed channels 43 is two, four or six, and the number of the intake holes 11 is two, four or six. By arranging the wing plate 45, the air inlet channel 44 is convenient to arrange, the positioning cylinder 41 and the positioning core 42 are convenient to connect, the structure is simple, and the processing is convenient.

As shown in fig. 4, further, the wing plates 45 are pointed at both top and bottom ends to reduce resistance to the passage of powder and compressed air.

Further, the wing plates 45 are obliquely arranged relative to the central axis of the positioning cylinder 41, when the number of the wing plates 45 is multiple, the oblique directions of the wing plates 45 are the same, and the powder coating is sprayed out from the nozzle with a rotary diffusion effect in a manner similar to a circumferential array form of fan blades, so that the sprayed powder is more uniform and better atomized. For example, the angle between the wing plate 45 and the central axis of the positioning cylinder 41 is 0-60 °, and preferably, the angle between the wing plate 45 and the central axis of the positioning cylinder 41 is 15 ° or 30 °. However, the present invention is not limited thereto, and the wing plates 45 may be parallel to the central axis of the positioning cylinder 41 (as shown in fig. 4).

As shown in fig. 1, the top of the positioning core 42 is a cone 422 with an upward tip, and the cone 422 extends out of the positioning cylinder 41 and into the first through hole 121. By providing the cone 422, the powder coating material entering the first through-hole 121 can be uniformly dispersed into the feeding passage 43 in the centering block 4, and the resistance to the passage of the powder coating material and the compressed air can be reduced. Specifically, the lower portion of the positioning core 42 is a cylinder, the cone 422 is connected to the upper portion of the cylinder, the cylinder is located in the positioning cylinder 41, and the feeding passage 43 is located between the outer wall of the cylinder and the inner wall of the positioning cylinder 41. For example, the cone angle of the cone 422 is 30 ° to 90 °, and preferably, the cone angle of the cone 422 is 60 °.

As shown in fig. 1 and 2, a lower stepped hole 122 is formed in the center of the lower end of the first sleeve 12, the upper end of the positioning cylinder 41 is inserted into and fixed in the lower stepped hole 122, an upper stepped hole 132 is formed in the center of the upper end of the second sleeve 13, and the lower end of the positioning cylinder 41 is inserted into and fixed in the upper stepped hole 132. Through setting up lower step hole 122 and going up step hole 132 and come the positioning tube 41, simple structure, the processing of being convenient for, assembly operation is simple and convenient, guarantees that first sleeve body 12 and second sleeve body 13 are not become flexible not to drop with positioning tube 41 assembly back, realizes fine centering location.

For example, the lower stepped hole 122 and the upper stepped hole 132 are cylindrical holes, the lower stepped hole 122 is in interference fit with the upper end of the positioning cylinder 41, and the upper stepped hole 132 is in interference fit with the lower end of the positioning cylinder 41, so that the processing and the assembly are convenient. However, the present invention is not limited thereto, and the lower stepped hole 122 and the upper stepped hole 132 may be fixed to the positioning cylinder 41 by other means, such as screwing the lower stepped hole 122 and the upper stepped hole 132 to the positioning cylinder 41.

As shown in fig. 1 and 2, in one embodiment, the lower portion of the second sleeve 13 is a flared first diverging portion 133 with an inner diameter diverging along the powder flow direction, the lower portion of the core 2 is a second diverging portion 24 with an outer diameter diverging along the powder flow direction, the shape of the second diverging portion 24 is identical to the shape of the first diverging portion 133, and the shape of the second diverging portion 24 is umbrella-shaped, so that the core 2 can also be referred to as an umbrella-shaped cap, and the injection port 31 (or referred to as an outlet circular seam) is formed between the annular bottom edge of the first diverging portion 133 and the annular bottom edge of the second diverging portion 24. The lower part of the inner core 2 is arranged to be an umbrella-shaped structure which is gradually expanded from top to bottom, so that the powder coating entering the cavity 3 can be guided, and the powder coating can be uniformly dispersed to the lower part of the nozzle in a large area.

As shown in fig. 1 and 2, further, the bottom edge of the first divergent portion 133 is a sharp-angled structure, and the bottom edge of the second divergent portion 24 is a sharp-angled structure, so that the spraying effect is better, when the second sleeve 13 is made of a metal conductive material and is connected with an electrostatic generator, when the powder is sprayed out from the spraying port 31, the powder passes through an electric field generated at the tip of the lower end of the second sleeve 13, the powder coating is charged by the electric field, the sprayed powder atomization effect is better, the charging capability of the powder is higher, and the spraying effect is better.

As shown in fig. 1, further, the bottom edge of the second sheath 13 is higher than the bottom edge of the inner core 2, which makes the spraying effect better.

In one embodiment of the present invention, the nozzle is made of a metallic conductive material, and when the powder coating material is ejected from the nozzle while passing through an electric field generated at the tip of the lower end of the second cap 13 when the second cap 13 is connected to a high voltage output line of the electrostatic generator, the powder coating material is charged by the electric field and finally adsorbed onto the surface of the coated substrate. The nozzle of the present embodiment may also be referred to as an annular discharge nozzle, and may be used in the field of electrostatic powder spraying.

In another embodiment of the present invention, the nozzle is made of a non-metallic material, such as an inorganic non-metallic material or an organic polymer material, and the nozzle of this embodiment can be used in other spray coating fields that do not require ionization.

However, the present invention is not limited thereto, and the material of each part of the nozzle may be different, for example, only the second sleeve 13 is made of a metal conductive material, and when the second sleeve 13 is connected to an electrostatic generator, it can be used for electrostatic powder spraying, and the first sleeve 12, the inner core 2 and the centering assembly 4 are made of a non-metal conductive material.

The nozzle for the powder spraying device has the advantages that the problems of powder adhesion at the bottom of the inner core and powder accumulation and falling off can be avoided when the nozzle is used, powder nodules generated on a sprayed product due to the falling of the accumulated powder can be avoided, the surface powder of the sprayed product is ensured to be uniform, and the reject ratio of the sprayed product is effectively reduced; in addition, the inner core can be cooled, and the situation that powder is easier to adhere due to the temperature rise of the inner core is prevented.

The invention also provides a powder spraying device which comprises the nozzle.

Because the bottom of the inner core 2 of the nozzle of the powder spraying device is provided with the air jet 22, when the powder spraying device is used, airflow is sprayed out from the air jet 22, so that not only can powder which is not adhered and accumulated at the bottom of the inner core 2 be blown away, but also the inner core 2 can be cooled, the phenomenon that the powder is easy to adhere due to the temperature rise of the inner core 2 is prevented, the phenomenon that the powder is adhered and accumulated at the bottom of the inner core 2 is avoided, the generation of powder nodules on a sprayed product due to the falling of the accumulated powder is avoided, the uniformity of powder on the surface of the sprayed product is ensured, and the.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.