CN211463557U - Nozzle for powder spraying device and powder spraying device - Google Patents

Abstract

The utility model provides a nozzle and powder spraying device for powder spraying device, it includes overcoat and the inner core of fixing in the overcoat, form the cavity that supplies the powder to pass through between overcoat and the inner core, be equipped with the inlet port on the lateral wall of overcoat, the inside of inner core is equipped with the airflow channel with the inlet port intercommunication along the axial, install the impeller in the bottom of inner core, the impeller can be connected with the inner core with rotating, be formed with annular jet between impeller and the inner core, airflow channel passes through impeller and jet intercommunication, the gas that lets in the inlet port flows through in proper order and flows through behind airflow channel and the impeller from the jet blowout, gas drives the impeller rotation when flowing through the impeller. During the use, when the spraying powder, to letting in compressed air in the inlet port, compressed air spouts from the air jet behind inlet port, airflow channel and the impeller of flowing through in proper order, both can blow off the inner core bottom and not have yet reached adhesion and accumulated powder, can cool off the inner core again, guarantee that the inner core bottom does not appear gluing powder and long-pending powder drops.

Description

Nozzle for powder spraying device and powder spraying device

Technical Field

The utility model belongs to the technical field of the powder spraying technique and specifically relates to a nozzle and powder spraying device for 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a nozzle and powder spraying device for powder spraying device to solve the problem that the powder that prior art exists easily adheres on the inner core bottom surface.

In order to achieve the above object, the utility model provides a nozzle for powder spraying device, it includes the overcoat and fixes inner core in the overcoat, the overcoat with form the cavity that supplies the powder to pass through between the inner core, be equipped with the inlet port on the lateral wall of overcoat, the inside of inner core along the axial be equipped with the airflow channel of inlet port intercommunication, install the impeller in the bottom of inner core, the impeller can rotate ground with the inner core is connected, the impeller with be formed with the air jet between the inner core, the airflow channel passes through the impeller with the air jet intercommunication lets in the gas of inlet port flows through in proper order the airflow channel with follow behind the impeller the air jet blowout, gas is flowing through drive during the impeller rotates.

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

The nozzle for the powder spraying device comprises an impeller shaft and a plurality of blades, wherein the impeller shaft is rotatably connected with the inner core, the blades are fixed on the outer wall of the impeller shaft and are arranged at intervals along the circumferential direction of the impeller shaft, a shaft hole communicated with the airflow channel is axially formed in the impeller shaft, a plurality of first air outlet holes communicated with the shaft hole are formed in the side wall of the impeller shaft, and gas sprayed from the first air outlet holes is sprayed to the blades and pushes the blades to rotate.

The nozzle for powder spraying device as described above, wherein the fan blade is curved, the fan blade is inclined with respect to the radial direction of the impeller shaft, the plurality of first air outlets and the plurality of fan blades are in one-to-one correspondence, and each of the first air outlets faces the side surface of the corresponding fan blade.

The nozzle for a powder spraying device as described above, wherein the impeller further includes a bottom plate fixed to the bottom of the plurality of blades and perpendicular to the impeller axis, and the air ejection port is formed between the bottom plate and the inner core.

The nozzle for the powder spraying device is characterized in that the impeller is rotatably connected with the inner core through a mandrel, the mandrel is arranged in the bottom of the inner core and is arranged along the axial direction of the inner core, the impeller shaft is rotatably sleeved outside the mandrel, the upper end of the mandrel is fixedly connected with the inner core, the lower end of the mandrel is provided with a bearing part for supporting the impeller, a flow guide channel communicated with the air flow channel is axially arranged in the mandrel, a plurality of second air outlets communicated with the flow guide channel are formed in the side wall of the mandrel, and an annular communicating groove communicated with the first air outlets and the second air outlets is formed in the inner wall of the impeller shaft.

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

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 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 utility model also provides a powder spraying device, it includes foretell nozzle.

The utility model discloses a characteristics and advantage that is used for powder spraying device's nozzle and powder spraying device are:

1. the utility model discloses a nozzle and powder spraying device for powder spraying device, through set up the inlet port on the overcoat lateral wall, set up the air current passageway with the inlet port intercommunication in the inner core, and set up the impeller in the inner core bottom, make and form annular jet orifice between inner core and the impeller, in the time of spraying powder, let in compressed air in the inlet port, compressed air flows through the inlet port in proper order and flows through the back with the air current passageway, spout from annular jet orifice, come to fill inner core bottom and impeller bottom because the jet orifice is dusted the cavity that the negative pressure that the jet-propelled inner core bottom produced, both can blow off the inner core bottom and not reach the powder that adheres and accumulate yet, can cool off the inner core again, prevent that the inner core from causing the powder to change the adhesion because of spouting high-speed powder friction temperature; in addition, because the impeller is arranged in the inner core, the bottom surface with larger area of the inner core in the prior art is changed into a narrower annular bottom surface, namely the area of the bottom surface of the inner core is reduced, and in addition, the annular bottom surface of the inner core is close to the air nozzle, so that a negative pressure cavity generated by compressed air sprayed from the spraying port can be filled more rapidly, the compressed air is sprayed out in an umbrella shape from the annular air nozzle, and floating powder floating to the bottom surface of the impeller from the periphery can be shielded, so that the powder is difficult to accumulate on the bottom surface of the inner core and the bottom surface of the impeller; meanwhile, the air nozzle is arranged outside the impeller, and the impeller can be driven by gas to rotate, so that powder accumulation on the bottom surface of the impeller can be effectively avoided, the utility model can ensure that powder sticking and powder accumulation falling do not occur on the bottom of the inner core and the impeller, avoid powder accretion generation on a sprayed product due to the falling powder accumulation, ensure the uniform powder on the surface of the sprayed product, and effectively reduce the disqualification rate of the sprayed product;

2. the nozzle for the powder spraying device and the powder spraying device of the utility model can further ensure that the bottom of the impeller is not sticky with the powder by adopting the impeller which is made of non-metal materials and is not easy to stick the powder, thereby further ensuring that the bottom of the nozzle does not stick the powder and the accumulated powder falls;

3. the utility model discloses a nozzle and powder spraying device for powder spraying device, through setting up centering subassembly, when the assembly, directly adopt centering subassembly with the first cover body, the second cover body and inner core coaxial coupling together, just can realize the coaxial assembly of overcoat and inner core, thereby can guarantee that the bottom edge of overcoat and the annular bottom edge of inner core are two concentric circles, guarantee that the nozzle opening is the even ring of ring width, assembly operation is simple, and convenient, it is swift, need not to make the frock alone and assemble, also need not to bore and beat the round pin shaft hole, greatly reduced the work load and the degree of difficulty of processing and assembly, and low cost.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1 is an assembly schematic view 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;

fig. 6 is a top view of an embodiment of an impeller of the present invention;

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;

fig. 8 is a side view in the direction C of fig. 6.

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 installation space; 23. inserting the column; 24. a second diverging section; 25. a stepped bore;

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;

5. an impeller; 51. an impeller shaft; 511. a shaft hole; 512. a first air outlet hole; 513. a communicating groove;

52. a fan blade; 53. a base plate;

6. an air jet; 7. a mandrel; 71. a bearing part; 72. a second air outlet; 73. a flow guide channel.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will 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 of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed 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 utility model provides a nozzle for powder spraying device, it includes overcoat 1 and fixes inner core 2 in overcoat 1, form cavity 3 that supplies the powder to pass through between overcoat 1 and the inner core 2, be equipped with inlet port 11 on the lateral wall of overcoat 1, the inside of inner core 2 is equipped with airflow channel 21 along the axial, airflow channel 21 communicates with inlet port 11, install impeller 5 in the bottom of inner core 2, impeller 5 can rotate and is connected with inner core 2, be formed with air jet 6 between impeller 5 and the inner core 2, air jet 6 communicates with the space (cavity) below inner core 2, airflow channel 21 communicates with air jet 6 through impeller 5, namely inlet port 11, airflow channel 21, the impeller 5 is communicated with the gas jet 6 in sequence, the gas introduced into the gas inlet 11 flows through the gas flow channel 21 and the impeller 5 in sequence and then is jetted out from the gas jet 6, and the gas drives the impeller 5 to rotate when flowing through the impeller 5.

The utility model discloses a when nozzle for powder spraying device is used for the spraying powder, the powder gets into from the upper portion entry of overcoat 1 after mixing with compressed air, spout between overcoat 1 bottom and inner core 2 bottom after cavity 3, meanwhile, let in compressed air in the inlet port 11 on the lateral wall of overcoat 1, compressed air flows through inlet port 11 in proper order, airflow channel 21 and impeller back, spout from the air jet 6 between inner core 2 and the impeller, in order to fill the negative pressure cavity of inner core 2 bottom, thereby eliminate the cavity, both can blow off the powder that inner core 2 bottom has not reached adhesion and accumulation yet, can cool off inner core 2 again, prevent that inner core 2 from leading to the powder to change the adhesion because of the high-speed powder friction of blowout; in addition, by arranging the impeller 5 in the inner core 2, the bottom surface (such as a circular bottom surface) with a larger area of the inner core in the prior art is changed into a narrower annular bottom surface, that is, the area of the bottom surface of the inner core is reduced, and in addition, the annular bottom surface of the inner core 2 is close to the air nozzle 6, so that a negative pressure cavity generated by compressed air ejected from the material spraying opening 31 can be filled more rapidly, the compressed air is ejected from the annular air nozzle in an umbrella shape, and floating powder floating from the periphery to the bottom surface of the impeller 5 can be shielded, so that the powder is difficult to accumulate on the bottom surface of the inner core 2 and the bottom surface of the impeller; meanwhile, the air jet 6 is arranged on the outer side of the impeller 5, and the impeller 5 can be driven by gas to rotate, so that powder accumulation on the bottom surface of the impeller 5 can be effectively avoided.

Therefore, the utility model discloses can guarantee that the bottom of inner core and the bottom of impeller do not appear gluing the powder, prevent that long-pending powder from dropping, avoid producing the powder tumour on the spraying product because of long-pending powder drops, guarantee that spraying product surface powder is even, effectively reduce the disqualification rate of spraying product.

As shown in fig. 1 and 2, a truncated cone-shaped mounting space 22 is provided in the bottom of the core 2, the overall structure of the impeller 5 is substantially truncated cone-shaped, and the taper angle of the overall structure of the impeller 5 is the same as that of the mounting space 22, for example, the taper angles of both are 45 ° to 120 °. However, the present invention is not limited thereto, and the shape of the installation space 22 may be a cylinder, and correspondingly, the overall structure of the impeller 5 may also be a cylinder.

Wherein, the fixed connection mode of overcoat 1 and inner core 2 can be pin joint, certainly can also be other connection modes, the utility model discloses this not restriction.

As shown in fig. 1 and 2, in one embodiment, the outer sleeve 1 is annular, the cavity 3 is an annular cavity, an annular nozzle opening 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, powder is sprayed out from the annular nozzle opening 31, the bottom of the inner core 2 is annular, an annular gas nozzle 6 is formed between the bottom of the inner core 2 and the impeller 5, the nozzle opening 31 surrounds the gas nozzle 6, gas is sprayed out from the annular gas nozzle 6, the powder sprayed out from the nozzle opening 31 is completely isolated from the impeller 5, and the powder is effectively prevented from being adhered to the bottom surface of the impeller 5.

As shown in fig. 1, 2, 6, 7 and 8, in one embodiment, the impeller 5 includes an impeller shaft 51 rotatably connected to the core 2, and a plurality of blades 52 fixed to an outer wall of the impeller shaft 51 and arranged at intervals along a circumferential direction of the impeller shaft 51, a shaft hole 511 communicating with the air flow passage is axially provided in the impeller shaft 51, a plurality of first air outlet holes 512 communicating with the shaft hole 511 are provided in a side wall of the impeller shaft 51, and air ejected from the first air outlet holes 512 is ejected toward the blades 52 to push the blades 52 to rotate.

In the embodiment, the first air outlet 512 is arranged on the impeller shaft 51, so that the air can pass through the first air outlet and can drive the fan blades 52 to rotate, and the impeller 5 is simple, compact, novel and ingenious in structural design.

As shown in fig. 6, 7, and 8, further, the fan blade 52 is curved, for example, the cross section of the fan blade 52 is arc-shaped, the fan blade 52 is inclined with respect to the radial direction of the impeller shaft 51, the plurality of first air outlet holes 512 correspond to the plurality of fan blades 52 one by one, that is, the number of the first air outlet holes 512 is equal to the number of the fan blades 52, each first air outlet hole 512 faces the side surface of the corresponding fan blade 52, or at least a part of the area of the side surface of the fan blade 52 faces (faces) the first air outlet hole 512, so that air can be sprayed onto the side surface of the fan blade 52 from the first air outlet holes 512, and the fan blade 52 is pushed to rotate. For example, the number of the fan blades 52 and the number of the first air outlet holes 512 are both 4-8. However, the present invention is not limited thereto, and each fan blade 52 may also correspond to more than two first air outlet holes 512, so that more air is blown to each fan blade 52.

As shown in fig. 6 and 8, the vane 52 is further disposed obliquely with respect to the axial direction of the impeller shaft 51, for example, one end of the vane 52 connected to the impeller shaft 51 is inclined by 0 ° to 45 ° with respect to the axial direction of the impeller shaft 51, or an angle α between one end of the vane 52 connected to the impeller shaft 51 and the bottom plate 53 is 45 ° to 90 °.

As shown in fig. 1, 6, 7, and 8, the impeller 5 further includes a bottom plate 53 fixed to the bottom of the plurality of blades 52 and perpendicular to the impeller shaft 51, and an air outlet 6 is formed between the bottom plate 53 and the core 2, that is, the air outlet 6 is formed between the outer periphery of the bottom plate 53 and the core 2, so that the air flowing out from the first air outlet 512 is ejected to the side surface of the blade 52, passes through the space between two adjacent blades 52, and is ejected from the air outlet 6. For example, the bottom plate 53 is a flat plate, and the bottom surface of the bottom plate 53 is flush with the bottom surface of the core 2, but the present invention is not limited thereto, and the bottom surface of the bottom plate 53 may be higher or lower than the bottom surface of the core 2.

For example, the annular width W of the annular gap (i.e., the air ejection port 6) between the bottom surface of the core 2 and the bottom plate 53 of the impeller 5 is 0.5mm to 2 mm.

As shown in fig. 1, 2, 6, 7, and 8, in a specific embodiment, the impeller 5 is rotatably connected to the inner core 2 through a mandrel 7, the mandrel 7 is disposed in the bottom of the inner core 2 and disposed along the axial direction of the inner core 2, the impeller shaft 51 is rotatably sleeved outside the mandrel 7, or the impeller 5 is in clearance fit with the mandrel 7, the upper end of the mandrel 7 is fixedly connected to the inner core 2, the lower end of the mandrel 7 has a support portion 71 for supporting the impeller 5, that is, the bottom plate 53 of the impeller 5 is horizontally disposed on the support portion 71 of the mandrel 7, the inside of the mandrel 7 is axially provided with a flow guide channel 73 communicating with the airflow channel, the sidewall of the mandrel 7 is provided with a plurality of second air outlet holes 72 communicating with the flow guide channel 73, the inner wall of the impeller shaft 51 is provided with an annular communication groove 513 for communicating the plurality of first air outlet holes 512 and the plurality of second air outlet holes 72, so that the plurality of first air outlet holes 512 and the plurality of second air outlet holes 72 can be communicated with each other through the communication groove 513 even when there is . For example, the number of the second air outlet holes 72 is 2-4.

This embodiment is connected impeller 5 and inner core 2 through setting up dabber 7, simple structure, simple to operate.

As shown in fig. 1 and 2, further, the upper end of the spindle 7 is fixed to the inner core 2 in an inserting manner, for example, the upper end of the spindle 7 is in interference fit with a step hole 25 in the inner core 2, when the impeller 5 is installed, the spindle 7 is firstly sleeved outside the spindle 7, and then the spindle 7 is fixed to the inner core 2 in an inserting manner.

As shown in fig. 1 and 2, the receiving portion 71 is further formed in an inverted conical shape or a hemispherical shape, but the receiving portion 71 may be a curved rotary body. As shown in fig. 1, in an embodiment, the impeller 5 is made of a non-metal material, and since the impeller 5 is made of a non-metal material which is not easy to stick powder, the bottom of the impeller 5 is further ensured not to stick powder. For example, impeller 5 is plastic impeller 5, light in weight, and it is nimble to rotate, and is little with the relative coefficient of friction between dabber 7, is difficult for producing the temperature rise because of the friction, nevertheless the utility model discloses not so as the limit, impeller 5 can also adopt other non-metallic material such as timber to make.

Further, the mandrel 7 is made of metal materials, and the structural strength is high.

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 inserting column 23 may also be fixed with the mounting hole 421 by other methods, such as the inserting column 23 and the mounting hole 421 are connected by a screw thread.

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 6, so that the gas flow direction is more stable and the diffusion effect is better. However, the present invention is not limited to this, the outer wall of the positioning cylinder 41 may not be provided with the annular groove 411, and when assembling, the plurality of air inlets 11 and the plurality of air inlet passages 44 are aligned one by one in the radial direction, so that the plurality of air inlets 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 plate 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 also be fixed to the positioning cylinder 41 by other methods, for example, the lower stepped hole 122 and the upper stepped hole 132 are connected to the positioning cylinder 41 by threads.

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, so that the spraying effect is better.

In an embodiment of the present invention, the nozzle is made of a metal conductive material, and when the second sleeve 13 is connected to a high voltage output line of the electrostatic generator, the powder coating is charged by the electric field when passing through the electric field generated at the tip of the lower end of the second sleeve 13 when being sprayed out from the nozzle, and finally adsorbed on 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 non-metal material, such as inorganic non-metal material or organic polymer material, and the nozzle of the present embodiment can be used in other spraying fields without ionization.

However, the utility model discloses do not regard this as the limit, each partial material of nozzle also can be different, for example only the second cover body 13 is made by metal conducting material, when second cover body 13 is connected with electrostatic generator, can be used to powder electrostatic spraying, and first cover body 12, inner core 2 and centering subassembly 4 adopt non-metal conducting material to make.

The nozzle for the powder spraying device of the utility model can prevent the bottom of the inner core from sticking powder and accumulated powder from dropping, avoid the generation of powder accretion on the sprayed product due to the dropping of the accumulated powder, ensure the uniform powder on the surface of the sprayed product and effectively reduce the disqualification rate of the sprayed product; 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 utility model also provides a powder spraying device, it includes foretell nozzle.

Because the nozzle of the powder spraying device of the utility model is provided with the air jet 6, when in use, the air flow is sprayed out from the air jet 6, which can not only blow away the powder which is not adhered and accumulated at the bottom of the inner core 2, but also cool the inner core 2, and prevent the inner core 2 from being easily adhered due to the temperature rise caused by the friction of the sprayed high-speed powder; in addition, by arranging the impeller made of the non-metallic material in the inner core 2, the bottom surface (such as a circular bottom surface) with a larger area of the inner core in the prior art is changed into a narrower annular bottom surface, namely the area of the bottom surface of the inner core 2 is reduced, in addition, the annular bottom surface of the inner core 2 is close to the air nozzle, a negative pressure cavity generated by compressed air sprayed from the spraying port can be filled more rapidly, the compressed air is sprayed out in an umbrella shape from the annular air nozzle, and floating powder floating from the periphery to the bottom surface of the impeller can be shielded, so that the powder is difficult to accumulate on the bottom surfaces of the inner core 2 and the impeller 5; meanwhile, the air jet is arranged on the outer side of the impeller, and the impeller can be driven by gas to rotate, so that powder accumulation on the bottom surface of the impeller can be effectively avoided.

Consequently the utility model discloses can guarantee that 2 bottoms of inner core and impeller bottom do not appear gluing the powder and long-pending powder drops, 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 disqualification rate of spraying product.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention. Moreover, it should be noted that the components of the present invention are not limited to the above-mentioned integral application, and various technical features described in the present invention 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 of the present invention.

Claims (13)

1. The utility model provides a nozzle for powder spraying device, its characterized in that, the nozzle includes the overcoat and fixes inner core in the overcoat, the overcoat with form the cavity that supplies the powder to pass through between the inner core, be equipped with the inlet port on the lateral wall of overcoat, the inside of inner core along the axial be equipped with the airflow channel of inlet port intercommunication, install the impeller in the bottom of inner core, the impeller can rotate ground with the inner core is connected, the impeller with be formed with the air jet between the inner core, airflow channel passes through the impeller with the air jet intercommunication lets in the gas of inlet port flows through in proper order the airflow channel with follow behind the impeller the air jet blowout, gas is flowing through the drive during the impeller rotates.

2. A nozzle for a powder spray coating apparatus as recited in claim 1, wherein the outer casing is annular and the cavity is an annular cavity, an annular nozzle opening communicating with the cavity is formed between a bottom edge of the outer casing and a bottom edge of the inner core, the bottom of the inner core is annular, the annular nozzle opening is formed between the bottom of the inner core and the impeller, and the nozzle opening surrounds the nozzle opening.

3. The nozzle for a powder coating apparatus as claimed in claim 1, wherein the impeller includes an impeller shaft rotatably connected to the inner core, and a plurality of blades fixed to an outer wall of the impeller shaft and arranged at intervals in a circumferential direction of the impeller shaft, a shaft hole communicating with the air flow passage is axially provided in the impeller shaft, a plurality of first air outlet holes communicating with the shaft hole are provided in a side wall of the impeller shaft, and the air ejected from the first air outlet holes is ejected toward the blades and pushes the blades to rotate.

4. A nozzle for a powder spraycoating apparatus according to claim 3, wherein said fan blade is curved, said fan blade is inclined with respect to a radial direction of said impeller shaft, a plurality of said first air outlet holes are provided in one-to-one correspondence with a plurality of said fan blades, and each of said first air outlet holes faces a side surface of the corresponding fan blade.

5. A nozzle for a powder spray coating apparatus as set forth in claim 3 wherein said impeller further comprises a bottom plate secured to the bottom of said plurality of vanes and perpendicular to the axis of said impeller, said bottom plate and said inner core defining said air ejection port therebetween.

6. A nozzle for a powder spraycoating apparatus according to claim 3, wherein the impeller is rotatably connected to the inner core by a spindle, the spindle is disposed in a bottom of the inner core and disposed along an axial direction of the inner core, the impeller shaft is rotatably fitted outside the spindle, an upper end of the spindle is fixedly connected to the inner core, a lower end of the spindle has a support portion for supporting the impeller, a flow guide passage communicated with the air flow passage is axially disposed inside the spindle, a plurality of second air outlet holes communicated with the flow guide passage are disposed on a side wall of the spindle, and an annular communication groove for communicating the plurality of first air outlet holes and the plurality of second air outlet holes is disposed on an inner wall of the impeller shaft.

7. A nozzle for a powder spraycoating apparatus according to any one of claims 1 to 6, wherein the impeller is an impeller made of a non-metallic material.

8. The nozzle for powder coating apparatus of any one of claims 1 to 6, 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 is disposed 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.

9. A nozzle for a powder spraycoating apparatus according to claim 8, 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.

10. A nozzle for a powder spraycoating apparatus according to claim 8, 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.

11. A nozzle for a powder coating apparatus as set forth in claim 8, 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.

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

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

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