Nozzle assembly and coating spray gun

Abstract

The utility model provides a nozzle assembly and a paint spray gun, the nozzle assembly comprises an air distribution ring used for separating a main airflow hole and an auxiliary airflow hole and a nozzle piece used for spraying paint, and the air distribution ring is provided with a plurality of primary homogenization holes which are uniformly distributed along a circumference; the nozzle piece is provided with a plurality of second-stage homogenizing holes which are uniformly distributed along a circumference, and the main airflow hole, the first-stage homogenizing holes and the second-stage homogenizing holes are communicated in sequence, so that airflow flowing out of the main airflow hole can be subjected to first-stage homogenizing through the air distribution ring and the plurality of first-stage homogenizing holes in the air distribution ring; according to the spray gun, the main airflow hole is formed in the spray nozzle piece, then the second-stage homogenization is conducted on the airflow through the spray nozzle piece and the second-stage homogenization holes in the spray nozzle piece, the airflow of the main airflow hole is more evenly supplied to the gun nozzle, even under the condition that the airflow pressure is large, uniform air supply can be achieved, and therefore the more ideal atomization effect on sprayed coating can be achieved; and more uniform coating spray is formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of paint spray guns, and in particular relates to a nozzle assembly and a paint spray gun. Background Art

[0002] The paint spray gun has a gun body and a nozzle assembly mounted on the gun body. The gun body is formed with multiple channels for paint and air to flow through. The front end of the gun body is provided with a paint outlet, a main airflow outlet and a secondary airflow outlet corresponding to these channels. The nozzle assembly docks with these channels to spray out the pressurized airflow and the paint at the same time, thereby forming a paint spray. The nozzle assembly usually includes an air splitter ring, a nozzle member and an air cap with a protruding corner. The air splitter ring is used to separate the airflow flowing out of the main outlet from the airflow flowing out of the secondary airflow outlet to avoid cross-flow; the nozzle member is used to cooperate with the gun body to spray the paint; the air cap is used to provide airflow while the paint is sprayed, thereby atomizing the sprayed paint to form a spray.

[0003] In existing paint spray guns, when the air pressure of the airflow flowing out of the main airflow port or the secondary airflow port is high, the airflow will quickly pass through the channel in the nozzle assembly and mainly concentrate in front of the corresponding airflow port, causing more airflow to be ejected from one side of the ejection port, thus causing the sprayed paint spray to have an uneven atomization effect. At present, the requirements of various industries for spraying effects are constantly increasing. Therefore, a paint spray gun that can achieve a more ideal atomization effect is currently needed. Utility Model Content

[0004] The utility model is designed to solve the above problems, and aims to provide a nozzle assembly and a paint spray gun that can provide a more uniform airflow and thus achieve a better atomization effect. The utility model adopts the following technical solutions:

[0005] The utility model provides a nozzle assembly, which is arranged in a paint spray gun, the gun body of the paint spray gun has a main air flow hole, a secondary air flow hole and a paint hole, and is characterized in that it comprises: an air dividing ring, which is used to separate the main air flow hole and the secondary air flow hole; and a nozzle piece, which is used to spray the paint, wherein the air dividing ring has a plurality of primary homogenizing holes evenly distributed along a first circumference, and the plurality of primary homogenizing holes are connected to the main air flow hole, and the nozzle piece has a plurality of secondary homogenizing holes evenly distributed along a second circumference, and the plurality of secondary homogenizing holes are connected to the plurality of primary homogenizing holes.

[0006] The nozzle assembly provided by the utility model may also have such technical features, wherein the diameter of the first circle is larger than the second circle, the primary homogenizing holes and the secondary homogenizing holes are both circular through holes, the number of the primary homogenizing holes is larger than the number of the secondary homogenizing holes, and the diameter of the primary homogenizing holes is smaller than the diameter of the secondary homogenizing holes.

[0007] The nozzle assembly provided by the utility model may also have such technical features, wherein the nozzle member has a nozzle member connecting portion and a nozzle member orifice plate portion provided with the secondary homogenizing hole, the air dividing ring has a clearance hole matching the nozzle member connecting portion, a stepped hole matching the nozzle member orifice plate portion and an air dividing ring orifice plate portion provided with the primary homogenizing hole, the nozzle member connecting portion passes through the clearance hole and is connected to the front end of the gun body, the nozzle member orifice plate portion is embedded in the stepped hole, a gap is formed between the nozzle member orifice plate portion and the air dividing ring orifice plate portion, and the gap is respectively connected to the multiple primary homogenizing holes and the multiple secondary homogenizing holes.

[0008] The nozzle assembly provided by the utility model may also have such a technical feature, wherein the nozzle member connecting portion is air-tightly embedded in the clearance hole, and the nozzle member orifice plate portion is air-tightly embedded in the stepped hole.

[0009] The nozzle assembly provided by the utility model may also have such a technical feature, wherein the front end of the gun body is provided with a mounting groove, the cross-section of the mounting groove is circular, and its inner diameter is larger than the diameter of the air dividing ring, and when the air dividing ring is arranged in the mounting groove, a gap is formed between the outer peripheral edge of the air dividing ring and the mounting groove, and the gap is connected to the secondary air flow hole.

[0010] The nozzle assembly provided by the utility model may also have such a technical feature, wherein the gun body has a front end face in the shape of a circular ring, on which the outlet of the main air flow hole and the outlet of the secondary air flow hole are staggered in the circumferential direction, and the air dividing ring has a cylindrical air flow dividing portion for abutting against the front end face to separate the outlet of the main air flow hole from the outlet of the secondary air flow hole.

[0011] The nozzle assembly provided by the utility model may also have such technical features, and also includes an atomizing cap, which is mounted on the outside of the air dividing ring and the nozzle member and is used to spray out an atomizing airflow; and an atomizing cap connecting ring, which is used to detachably connect the atomizing cap to the front end of the gun body.

[0012] The nozzle assembly provided by the utility model may also have such a technical feature, wherein the atomizing cap has two protruding corners and atomizing air channels extending along the two corners respectively, and the atomizing air channels are connected to the gap.

[0013] The nozzle assembly provided by the utility model may also have such a technical feature, wherein the air dividing ring is made of copper.

[0014] The utility model provides a paint spray gun, which is characterized by comprising: a gun body; and the above-mentioned nozzle assembly, which is arranged at the front end of the gun body and is used for spraying atomized paint.

[0015] Function and effect of utility model

[0016] According to the nozzle assembly and paint spray gun of the utility model, the nozzle assembly includes an air dividing ring for separating the main and secondary air flow holes and a nozzle member for spraying paint, wherein, since the air dividing ring has a plurality of primary homogenizing holes evenly distributed along a circle, the nozzle member has a plurality of secondary homogenizing holes evenly distributed along a circle, and the main air flow hole, the primary homogenizing holes and the secondary homogenizing holes are connected in sequence, the air flow flowing out of the main air flow hole can be homogenized at the first level through the air dividing ring and the plurality of primary homogenizing holes thereon, and then the air flow can be homogenized at the second level through the nozzle member and the plurality of secondary homogenizing holes thereon, so that the air flow of the main air flow hole is more evenly supplied to the gun nozzle, and even air supply can be achieved evenly evenly evenly evenly under the condition of high air flow pressure, thereby achieving a more ideal atomization effect for the sprayed paint and forming a more uniform paint spray. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional diagram of a nozzle assembly in an embodiment of the utility model;

[0018] Figure 2 It is a structural exploded view of the nozzle assembly in the embodiment of the utility model;

[0019] Figure 3 It is a three-dimensional diagram of the gas dividing ring in the embodiment of the utility model;

[0020] Figure 4 It is a three-dimensional diagram of the gas dividing ring at different angles in the embodiment of the utility model;

[0021] Figure 5 is a cross-sectional view of the gas dividing ring in the embodiment of the utility model;

[0022] Figure 6 is a three-dimensional diagram of a nozzle member in an embodiment of the utility model;

[0023] Figure 7 It is a three-dimensional diagram of the nozzle member at different angles in the embodiment of the utility model;

[0024] Figure 8 is a cross-sectional view of a nozzle member in an embodiment of the utility model;

[0025] Fig. 9is a cross-sectional view of an air cap in an embodiment of the utility model;

[0026] Fig.10 It is a three-dimensional diagram of a spray gun in an embodiment of the utility model;

[0027] Fig.11 is a cross-sectional view of a gun body in an embodiment of the utility model;

[0028] Fig.12 It is an enlarged view of the front end of the spray gun in the embodiment of the utility model;

[0029] Fig.13 It is an orthographic projection diagram of the front end of the spray gun in the embodiment of the utility model;

[0030] Fig.14 It is a cross-sectional view of the front end of the spray gun in the embodiment of the utility model;

[0031] Fig.15 It is a schematic diagram of the airflow in the spray gun in the embodiment of the utility model.

[0032] Reference numerals:

[0033] Spray gun 100; gun body 10; main body 11; main body front end 111; inner annular protrusion 1111; inner mounting hole 1111a; outer annular protrusion 1112; mounting groove 1113; abutting end surface 1113a; main air flow inlet 1113b; secondary air flow inlet 1113c; barrel mounting hole 112; first coating material flow channel 113; material needle accommodating hole 114; air flow regulator mounting hole 115; coating material regulator mounting hole 116; main air flow channel 117; main air channel part 1171; main branch air channel part 1172; secondary air flow channel 118; secondary air channel part 1181; secondary branch air channel part 1182; handle 12; nozzle assembly 20; air dividing ring 21; stepped ring part 211; limiting ring part 212; air dividing ring orifice plate part 213; primary homogenizing hole 213a; partition part 214; partition end surface 214 a; nozzle member 22; nozzle portion 221; second paint flow channel 2211; paint spray port 2211a; nozzle connecting portion 222; annular groove 222a; nozzle member orifice plate portion 223; secondary homogenizing hole 223a; mounting fitting portion 224; conical surface 224a; nozzle limit portion 225; conical surface 225a; nozzle ring connecting member 23; air cap 24; cover-shaped portion 241; main air flow spray port 241a; corner 242; corner air flow channel 2421; corner air flow spray port 2421a; middle air flow spray port 241b; air cap connecting ring 25; first sealing ring 261; second sealing ring 262; third sealing ring 263; first air flow chamber 271; second air flow chamber 272; third air flow chamber 273; fourth air flow chamber 274; fifth air flow chamber 275; gap 276; paint needle 30. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the nozzle assembly and the spray gun of the present invention are specifically described below in conjunction with the embodiments and drawings.

[0035] <Example>

[0036] The present embodiment provides a nozzle assembly for a paint spray gun. The gun body of the paint spray gun generally has a paint hole for allowing the paint to flow out, and a primary air flow hole and a secondary air flow hole for supplying air for atomization of the paint. The nozzle assembly is used to be installed on the front end of the gun body and docked with the paint hole, the primary air flow hole and the secondary air flow hole on the gun body.

[0037] Figure 1 is a three-dimensional diagram of the nozzle assembly in this embodiment, Figure 2 is a structural exploded view of the nozzle assembly in this embodiment.

[0038] like Figure 1 and Figure 2 As shown, the nozzle assembly 20 includes an air dividing ring 21 , a nozzle member 22 , a nozzle connecting member 23 , an air cap 24 , an air cap connecting ring 25 , a first sealing ring 261 , a second sealing ring 262 and a third sealing ring 263 .

[0039] Figure 3 : is a three-dimensional diagram of the gas dividing ring in this embodiment, Figure 4 2 is a stereogram of the gas dividing ring at different angles in this embodiment. Figure 5 2 is a cross-sectional view of the gas dividing ring in this embodiment.

[0040] like Figures 3 to 5 As shown, the air dividing ring 21 is an annular element of an axisymmetric structure, which includes a stepped ring portion 211 , a limiting ring portion 212 , an air dividing ring orifice portion 213 and a partition portion 214 which are coaxially connected in sequence.

[0041] The cross section of the stepped ring portion 211 in the circumferential direction is in the shape of a step, and a circle of stepped structure is formed at the outer end of the inner circle.

[0042] The limiting ring portion 212 is generally in the shape of an annular plate, with an outer diameter larger than that of the stepped ring portion 211 and smaller than the diameter D of the mounting groove 1113 ; and an inner diameter smaller than the outer diameter of the stepped ring portion 211 and larger than the inner diameter of the stepped ring portion 211 .

[0043] The air dividing ring orifice plate portion 213 is roughly in the shape of an annular plate, and its surface direction is perpendicular to the axial direction of the air dividing ring 21. Its outer diameter is slightly larger than the outer diameter of the step ring portion 211 and smaller than the outer diameter of the limiting ring portion 212, and its inner diameter is smaller than the inner diameter of the step ring portion 211. A plurality of primary homogenizing holes 213a are provided along the circumference of the air dividing ring orifice plate portion 213, and are penetrated along the thickness direction thereof. The plurality of primary homogenizing holes 213a are all circular through holes with the same aperture, and are evenly distributed along a circumference. In this embodiment, a total of twelve primary homogenizing holes 213a are provided.

[0044] The partition part 214 is cylindrical, and its outer diameter is substantially consistent with the outer diameter of the gas dividing ring orifice part 213, and its inner diameter is larger than the inner diameter of the limiting ring part 212. The partition part 214 has a flat circular partition end face 214a at one end away from the stepped ring part 211, and the surface direction of the partition end face 214a is perpendicular to the axial direction of the gas dividing ring 21.

[0045] Since the inner diameter of the limiting ring portion 212 is larger than the inner diameter of the step ring portion 211 and larger than the inner diameter of the air dividing ring orifice plate portion 213, a circle of annular grooves is formed between the step ring portion 211 and the air dividing ring orifice plate portion 213. In the axial direction of the air dividing ring 21, the step ring portion 211 partially blocks the multiple primary homogenizing holes 213a, and the partition portion 214 does not block the multiple primary homogenizing holes 213a. In addition, chamfers are provided at the outer edges of the step ring portion 211 and the limiting ring portion 212.

[0046] In this embodiment, the material of the gas dividing ring 21 is copper, which has high strength, corrosion resistance and is easy to process.

[0047] Figure 6 is a three-dimensional diagram of the nozzle member in this embodiment, Figure 7 2 is a three-dimensional diagram of the nozzle member at different angles in this embodiment. Figure 8 is a sectional view of the nozzle member in this embodiment.

[0048] like Figures 6 to 8 As shown, the nozzle member 22 is a disc-shaped member with an axisymmetric structure, which includes a nozzle portion 221, a nozzle member connecting portion 222, a nozzle member orifice plate portion 223, a mounting matching portion 224 and a nozzle member limiting portion 225.

[0049] One end of the nozzle portion 221 is conical, and the rest is roughly cylindrical. The interior of the nozzle portion 221 has a second paint flow channel 2211 that basically corresponds to its shape. The conical end has a paint outlet 2211a that is connected to the second paint flow channel 2211. When the nozzle member 22 is installed on the front end portion 111 of the main body of the gun body 10, the first paint flow channel 113 and the second paint flow channel 2211 are spliced ​​to form a complete paint flow channel.

[0050] The nozzle member connecting portion 222 is formed on the other end of the nozzle portion 221, and its inner circle forms a circle of annular embedding groove 222a for installation.

[0051] The orifice plate portion 223 of the nozzle member is roughly in the shape of an annular plate, extending from the periphery of the middle of the nozzle portion 221, and the surface direction of the orifice plate portion 223 of the nozzle member is perpendicular to the axial direction of the nozzle member 22. The outer diameter and inner diameter of the orifice plate portion 223 of the nozzle member are respectively smaller than the outer diameter and inner diameter of the orifice plate portion 223 of the nozzle member. A plurality of secondary homogenizing holes 223a are provided along the circumference of the orifice plate portion 223 of the nozzle member, which penetrate along the thickness direction thereof. The plurality of secondary homogenizing holes 223a are all circular through holes with the same aperture, and the aperture is larger than the aperture of the primary homogenizing hole 213a, and are evenly distributed along a circumference. In this embodiment, a total of six second air holes 213a are provided.

[0052] The mounting fitting portion 224 is further extended outward from the edge of the nozzle member orifice portion 223, the thickness of the mounting fitting portion 224 is greater than the thickness of the nozzle member orifice portion 223, and the outer contour of the mounting fitting portion 224 is hexagonal, which is used to cooperate with corresponding tools (such as a hexagonal wrench) during assembly.

[0053] The nozzle member stopper 225 also extends from the periphery of the middle of the nozzle member 221 and is closer to the nozzle member connecting portion 222 than the nozzle member orifice plate portion 223. The outer diameter of the nozzle member stopper 225 is smaller than the outer diameter of the nozzle member orifice plate portion 223, and one end of the nozzle member stopper 225 close to the nozzle member connecting portion 222 has a conical surface 225a. In the axial direction of the nozzle member 22, the nozzle member stopper 225 partially blocks the second air hole 213a.

[0054] In this embodiment, the nozzle member 22 is made of stainless steel.

[0055] The nozzle connector 23 is an annular member, and has a plurality of protrusions on its outer circumference, and is used to connect the nozzle member 22 to the gun body 10. In this embodiment, the material of the nozzle connector 23 is engineering plastic.

[0056] Fig. 9 2 is a cross-sectional view of the air cap in this embodiment.

[0057] like Fig. 9 As shown, the air cap 24 includes a roughly circular cover-shaped cover portion 241 and two corner portions 242 protruding outward from both sides of the upper surface of the cover-shaped portion 241. The middle of the top surface of the cover-shaped portion 241 has a through circular hole, and the aperture of the circular hole is slightly larger than the outer diameter of the tip of the nozzle portion 221. The two corner portions 242 have extended corner airflow channels 2421, and the two corner portions 242 have corner airflow outlets 2421a connected to the corner airflow channels 2421.

[0058] The air cap connecting ring 25 is annular, with an inner ring at one end having an annular protrusion, and an inner ring at the other end having an annular protrusion and internal threads, for rotatably connecting the air cap 24 to the main body front end 111 of the gun body 10 .

[0059] The sealing rings are all rubber rings. The first sealing ring 261 is used to seal between the nozzle member 22 and the gun body 10. The second sealing ring 262 is used to seal between the gun body 10 and the air cap connecting ring 25. The third sealing ring 263 is used to seal between the air cap connecting ring 25 and the air cap 24. The circumferential cross section of the third sealing ring 263 is U-shaped.

[0060] The matching relationship between the nozzle assembly 20 and the gun body of the spray gun will be described in detail below.

[0061] Fig.10 1 is a three-dimensional diagram of the spray gun in this embodiment, Fig.11 It is a cross-sectional view of the gun body in this embodiment.

[0062] like Fig.10 and Fig.11 As shown, the spray gun 100 includes a gun body 10, a paint needle 30 and the above-mentioned nozzle assembly 20. The nozzle assembly 20 is detachably mounted on the front end of the gun body 10, and cooperates with the gun body 10 to spray the atomized paint spray. The spray gun 100 generally also includes a paint barrel mounted on the gun body 10, a discharge control wrench, and structures such as an air supply valve, a gas flow regulating valve, and a paint flow regulating valve arranged in the gun body 10, which are not shown in the figure, and these structures can adopt corresponding structures in the prior art.

[0063] The gun body 10 includes an integrally formed main body 11 and a handle 12. The main body 11 is used to spray paint, and the handle 12 is used for a user to hold. At the same time, air flow channels and paint channels are formed in the main body 11 and the handle 12 for spraying paint.

[0064] The main body 11 has a barrel mounting hole 112 , a paint flow channel 113 , a material needle accommodating hole 114 , an airflow regulating valve mounting hole 115 , a paint regulating valve mounting hole 116 , a main airflow channel 117 and a secondary airflow channel 118 .

[0065] The barrel mounting hole 112 is a circular through hole with an internal thread for mounting a paint barrel. The paint flow channel 113 is connected to the barrel mounting hole 112 for allowing the paint in the paint barrel to flow out. The main body front end portion 111 of the main body 11 is an axisymmetric structure. With respect to the axial direction of the main body front end portion 111, the paint flow channel 113 is obliquely arranged between the barrel mounting hole 112 and the main body front end portion 111.

[0066] The material needle accommodating hole 114 is used to accommodate the coating needle 30. The material needle accommodating hole 114 is also provided with a spring and other structures for positioning and resetting the coating needle 30, and the corresponding structures in the prior art can be specifically adopted.

[0067] The airflow regulating valve mounting hole 115 is a stepped hole, which is arranged on one side of the width direction of the main body 11 and is used to install a gas flow regulating valve. The gas flow regulating valve is used to adjust the flow ratio of the air entering the main airflow channel 117 and the secondary airflow channel 118, thereby adjusting the spray width of the spray gun 10.

[0068] The paint regulating valve mounting hole 116 is a circular hole with an internal thread, and is arranged on the other end of the main body 11 opposite to the front end portion 111 of the main body, and is used to install a paint flow regulating valve. The paint flow regulating valve is used to limit the maximum stroke of the paint needle 30, thereby adjusting the flow of paint sprayed when the discharge control wrench is pressed.

[0069] The main airflow channel 117 is used to provide the main airflow for the atomization of the coating, and the main airflow channel 117 includes a main airway portion (not shown in the figure) and two main branch airway portions 1172. One end of the main airway portion is connected to the airflow regulating valve mounting hole 115, and the other end is respectively connected to one end of the two main branch airway portions 1172, and the other ends of the two main branch airway portions 1172 are respectively connected to the outside. In this embodiment, the main airway portion is located on one side of the width direction of the gun body 10, and from the end of the gun body 10 having the airflow regulating valve mounting hole 115 to the front end portion 111 of the gun body, the main airway portion is inclined from one side of the width direction of the gun body 10 to the middle of the gun body 10. The inner diameters (apertures) of the two main branch airway portions 1172 are the same.

[0070] The secondary airflow channel 118 is used to provide a secondary airflow, which is used to make the sprayed atomized paint form an elliptical spray width. The spray width of the atomized paint can be adjusted by adjusting the size of the secondary airflow. The secondary airflow channel 118 includes a secondary airway portion (not shown in the figure) and two secondary branch airway portions 1182. One end of the secondary airway portion is also connected to the airflow regulating valve mounting hole 115, and the other end is respectively connected to one end of the two secondary branch airway portions 1182, and the other ends of the two secondary branch airway portions 1182 are respectively connected to the outside. In this embodiment, the secondary airway portion is located on the other side of the width direction of the gun body 10, and from the end of the gun body 10 having the airflow regulating valve mounting hole 115 to the front end portion 111 of the gun body, the secondary airway portion is inclined from the above-mentioned other side of the width direction of the gun body 10 to the middle part of the gun body 10. In the height direction of the gun body 10, the secondary airflow channel 118 is located below the main airflow channel 117 as a whole. The inner diameters of the two secondary branch airway portions 1182 are the same and smaller than the inner diameter of the main branch airway portion 1172 .

[0071] Fig.12 : is an enlarged view of the front end of the spray gun in this embodiment, Fig.13 It is an orthographic projection diagram of the front end of the spray gun in this embodiment.

[0072] like Fig.12 and Fig.13 As shown, the main body front end portion 111 of the gun body 10 has a coaxially arranged inner annular protrusion 1111 and an outer annular protrusion 1112, the inner side of the inner annular protrusion 1111 is a connected paint flow channel 113 and an inner mounting hole 1111a, and an annular mounting groove 1113 is formed between the inner annular protrusion 1111 and the outer annular protrusion 1112. The groove bottom of the mounting groove 1113 is a flat abutment end face 1113a, and the surface direction of the abutment end face 1113a is perpendicular to the axial direction of the main body front end portion 111. The outer peripheral surface of the outer annular protrusion 1112 is formed with an external thread.

[0073] Two main airflow openings 1113b and two secondary airflow openings 1113c are formed on the abutting end surface 1113a. The two main airflow openings 1113b are close to each other, both are circular, and are respectively connected to the other ends of the two main branch airway parts 1172. The two secondary airflow openings 1113c are also close to each other, both are circular, and are respectively connected to the other ends of the two secondary branch airway parts 1182, and the diameter of the secondary airflow opening 1113c is smaller than the diameter of the main airflow opening 1113b. The distance d1 from point B on the edge of the primary airflow opening 1113b (i.e., the point on the edge of the primary airflow opening 1113b that is farthest from the center of the abutting end face 1113a) to the center of the abutting end face 1113a is smaller than the distance d2 from point C on the edge of the secondary airflow opening 1113c (i.e., the point on the edge of the secondary airflow opening 1113c that is closest to the center of the abutting end face 1113a) to the center of the abutting end face 1113a. That is, on the abutting end face 1113a, the two primary airflow openings 1113b and the two secondary airflow openings 1113c are arranged at completely different circumferential radii. In this embodiment, the two main air flow inlets 1113b and the two secondary air flow inlets 1113c are both located on the side of the abutting end surface 1113a close to the handle portion 12 (the lower half of the abutting end surface 1113a in the figure), one of the main air flow inlets 1113b and one of the secondary air flow inlets 1113c are roughly located at the center axis A1 of the gun body 10, the other main air flow inlet 1113b is located on the side of the gun body 10 having the main airway portion 1171, and the other secondary air flow inlet 1113c is located on the side of the gun body 10 having the secondary airway portion 1181. In this way, the curvature of the main branch airway portion 1172 and the secondary branch airway portion 1182 can be made relatively small, and the airflow therein can flow more smoothly.

[0074] The rear end of the handle portion 12 (i.e., the end away from the main body 11) has an air inlet for connecting to a gas source, and the handle portion 12 has an air inlet channel (not shown in the figure) extending roughly along its length direction. One end of the air inlet channel is connected to the air inlet at the rear end of the handle portion 12, and the other end is respectively connected to the main air flow channel 117 and the secondary air flow channel 118, and the ratio of the gas entering from the air inlet channel to the main air flow channel 117 and the secondary air flow channel 118 can be adjusted by a gas flow regulating valve.

[0075] The paint needle 30 is used to cooperate with the nozzle member 22 to realize the spraying of the paint. In the initial state when the discharge control wrench is not pressed, the tip of the paint needle 30 is engaged with the tip of the second paint flow channel 2211, thereby preventing the paint from flowing out; when the discharge control wrench is pressed, the corresponding transmission structure drives the paint needle 30 to retreat, so that the paint can be sprayed out from the paint spray port 2211a. At the same time, when the discharge control wrench is pressed, it drives the air supply valve to connect the airflow into the channel, so that the spray gun sprays atomized paint.

[0076] Fig.14 It is a cross-sectional view of the front end of the spray gun in this embodiment.

[0077] like Fig.14 As shown, after the assembly is completed, the nozzle ring connector 23 is embedded in the inner mounting hole 1111a, and the protrusion on its outer periphery abuts against the inner mounting hole 1111a, so that the nozzle ring connector 23 is tightly embedded in the gun body.

[0078] The nozzle connection part 222 of the nozzle member 22 is embedded in the inner mounting hole 1111a, and a circle of protrusions at the front end of the nozzle ring connection member 23 is embedded in the annular groove 222a on the inner side of the nozzle member 22. The conical surface 225a of the nozzle stopper 225 of the nozzle member 22 abuts against the conical surface on the inner side of the end of the inner annular protrusion 1111, so that the nozzle member 22 is stably connected to the front end 111 of the main body. The first sealing ring 261 is sleeved on the outer periphery of the nozzle stopper 225 and is tightly attached to the front end of the inner annular protrusion 1111, thereby achieving sealing. The first paint flow channel 113, the through hole of the nozzle ring connection member 23 and the second paint flow channel 2211 constitute a complete paint flow channel.

[0079] The air dividing ring 21 is pressed between the nozzle member 22 and the main body front end portion 111 of the gun body 10. Specifically, the outer end of the stepped ring portion 211 of the air dividing ring 21 abuts against the mounting matching portion 224 of the nozzle member 22, and the inner circle of the stepped ring portion 211 abuts against the outer periphery of the nozzle member orifice plate portion 223 of the nozzle member 22; the inner circle of the air dividing ring orifice plate portion 213 of the air dividing ring 21 abuts against the outer periphery of the inner annular protrusion 1111; the partition end face 214a of the partition portion 214 of the air dividing ring 21 abuts against the abutting end face 1113a. The primary airflow port 1113b on the abutting end face 1113a is located on the inner side of the partition portion 214, and the secondary airflow port 1113c is located on the outer side of the partition portion 214, thereby being airtightly separated. An annular first airflow cavity 271 is formed between the abutting end surface 1113a and the air dividing ring orifice plate portion 213, and an annular second airflow cavity 272 is formed between the air dividing ring orifice plate portion 213 and the nozzle member orifice plate portion 223. An annular third airflow cavity 273 is formed between the abutting end surface 1113a and the limiting ring portion 212, and a circle of gap 276 communicating with the third airflow cavity 273 is provided between the outer periphery of the limiting ring portion 212 and the outer annular protrusion 1112.

[0080] The air cap 24 is sleeved on the nozzle member 22 and is rotatably connected to the front end of the gun body 10 through the air cap connecting ring 25. Specifically, the annular protrusion on the inner side of the air cap 24 abuts against the mounting matching portion 224 of the nozzle member 22, the edge of the cap-shaped portion 241 of the air cap 24 is engaged with the protrusion of the inner ring at one end of the air cap connecting ring 25, and the other end of the air cap connecting ring 25 is tightened on the outer annular protrusion 1112, and the air cap 24 can rotate relative to the air cap connecting ring 25 and the gun body 10. The second sealing ring 262 is sleeved on the outer periphery of the edge of the cap-shaped portion 241 and is tightly attached to the protrusion of the inner ring at one end of the air cap connecting ring 25, thereby achieving sealing. The third sealing ring 263 is sleeved on the outer periphery of the outer annular protrusion 1112 and is embedded in the annular groove of the inner ring of the air cap connecting ring 25, thereby achieving sealing. An annular fourth airflow chamber 274 is formed between the air cap 24 and the limiting ring portion 212 of the air dividing ring 21, and an annular fifth airflow chamber 275 is formed between the cover-like portion 241 of the air cap 24 and the outer periphery of the nozzle portion 221 and the orifice plate portion 223 of the nozzle member. A main airflow outlet 241a communicating with the fifth airflow chamber 275 is formed between the circular hole in the middle of the cover-like portion 241 and the tip of the nozzle portion 221.

[0081] Fig.15 Schematic diagram of the airflow in the spray gun in this embodiment.

[0082] like Fig.14 and Fig.15 As shown, the gas entering the gun body 10 is divided into the main air flow channel 117 and the secondary air flow channel 118 to become the main air flow F1 and the secondary air flow F2.

[0083] The main airflow F1 enters the first airflow chamber 271 from the main airflow inlet 1113b, is blocked by the air dividing ring orifice plate portion 213 and is buffered to a certain extent, and then passes through multiple first-level homogenizing holes 213a to enter the second airflow chamber 272, thereby achieving the first-level homogenization of the main airflow F1; the main airflow F1 entering the second airflow chamber 272 is again blocked by the nozzle member orifice plate portion 223, and then passes through multiple second-level homogenizing holes 223a to enter the fifth airflow chamber 274, thereby achieving the second-level homogenization of the main airflow F1; then, the main airflow F1 that has been homogenized at two levels is ejected from the main airflow outlet 241a and the middle airflow outlet 241b, and at the same time, the paint is ejected from the paint outlet 2211a of the nozzle member 22 through the paint flow channel to form an atomized paint spray.

[0084] The secondary airflow F2 enters the third airflow chamber 273 from the secondary airflow port 1113c, is blocked and buffered by the limiting ring portion 212, and then enters the fourth airflow chamber 274 through a circle of gaps 276. Since the size of the gap 276 is significantly smaller than that of the third airflow chamber 273, the secondary airflow F2 is dispersed along the circumference of the gap 276 when passing through the gap 276, and a certain degree of uniformity is achieved; furthermore, the secondary airflow F2 enters the two corner airflow channels 2421 of the air cap 24, and is ejected from multiple corner airflow outlets 2421a.

[0085] Functions and Effects of the Embodiments

[0086] According to the nozzle assembly and spray gun provided in this embodiment, the nozzle assembly includes an air dividing ring for separating the main and secondary air flow holes and a nozzle part for spraying paint, wherein, since the air dividing ring has a plurality of primary equalization holes evenly distributed along a circle, the nozzle part has a plurality of secondary equalization holes evenly distributed along a circle, and the main air flow hole, the primary equalization holes and the secondary equalization holes are connected in sequence, the air flow flowing out of the main air flow hole can be homogenized at the first level through the air dividing ring and the plurality of primary equalization holes thereon, and then the air flow can be homogenized at the second level through the nozzle part and the plurality of secondary equalization holes thereon, so that the air flow of the main air flow hole is more evenly supplied to the gun nozzle, and even air supply can be achieved evenly evenly evenly evenly under the condition of high air flow pressure, thereby achieving a more ideal atomization effect for the sprayed paint and forming a more uniform paint spray.

[0087] In the embodiment, the air dividing ring has an annular air dividing ring orifice plate portion, on which the primary equalizing hole is arranged; the nozzle member has an annular nozzle member orifice plate portion, on which the secondary equalizing hole is arranged, and the diameter of the circumference of the primary equalizing hole is larger than the diameter of the circumference of the secondary equalizing hole. Therefore, the airflow of the main air flow hole can be blocked and buffered by the air dividing ring orifice plate portion, and then the airflow is made to pass through multiple primary equalizing holes to achieve the first level of equalization. Similarly, the airflow can be blocked and buffered by the nozzle member orifice plate portion, and then the second level of equalization is achieved through multiple secondary equalizing holes, and the airflow is gathered toward the direction of the gun nozzle, thereby achieving a better airflow equalization effect and improving the utilization efficiency of the airflow energy.

[0088] Furthermore, the air dividing ring separates the main and secondary air flow holes, and a circle of smaller gap is formed between the limiting ring portion of the air dividing ring and the front end of the gun body. Therefore, the airflow flowing out of the secondary air flow port can be blocked and buffered by the limiting ring portion, and then dispersedly pass through a circle of gaps to enter the atomization cap. Therefore, the airflow flowing out of the secondary air flow port can also be uniformed, so that the atomization effect is better.

[0089] In the embodiment, the main air flow inlet and the secondary air flow inlet on the abutting end face at the front end of the gun body are arranged on completely different circumferential radii, and the air dividing ring has a circular ring-shaped partition portion, which abuts the abutting end face to achieve the separation of the main air flow inlet and the secondary air flow inlet, that is, the air dividing ring can adopt an axisymmetric structure. In this way, it is only necessary to press the air dividing ring onto the front end of the gun body, and there is no requirement for the circumferential position of the air dividing ring. The assembly of the nozzle assembly is more convenient and quick, which can save a lot of assembly time in the production process of the paint spray gun and in the process of user maintenance of the spray gun.

[0090] Furthermore, the partition part has a partition end face that is annular and perpendicular to the axial direction of the air dividing ring, and the abutting end face at the front end of the gun body is a plane, so the airtight separation of the main and secondary air flow ports can be achieved by tightly fitting the partition end face with the abutting end face, which is easy to assemble, simple in structure and highly reliable. In addition, the air dividing ring is made of copper, which has the characteristics of high strength, corrosion resistance, and easy processing. It can be used stably for a long time, and will not deteriorate or deform after long-term use, which can reduce the frequency of users replacing the air dividing ring and reduce the use cost of the spray gun.

[0091] In the embodiment, two main air inlets and two secondary air inlets are provided on the front end of the gun body, and the two main air inlets are provided on the same circular radius, and the two secondary air inlets are provided on the same circular radius. In this way, the above-mentioned air dividing ring can also be adopted in the same way to realize simple and quick assembly, and at the same time, it can avoid the enlargement of the gun body caused by setting the main and secondary air inlets on completely different circular radii while ensuring the air flow, so that the gun body can maintain a relatively small structure.

[0092] Furthermore, the main airway part of the main airway channel in the gun body and the secondary airway part of the secondary airway channel are respectively located on both sides of the gun body, one main airflow opening is located at the central axis of the gun body, and the other main airflow opening is located close to the side of the main airway part, one secondary airflow opening is located at the central axis of the gun body, and the other secondary airflow opening is close to the side of the secondary airway part. In this way, the bending degrees of the two main branch airflow channels and the two secondary branch airflow channels connected between the corresponding airway parts and the airflow openings can be relatively small, which is conducive to making the airflow flow more smoothly in the gun body and maintaining a sufficient and stable airflow volume.

[0093] The above embodiments are only used to illustrate the specific implementation of the utility model, and the utility model is not limited to the description scope of the above embodiments. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A nozzle assembly, arranged in a paint spray gun, wherein the gun body of the paint spray gun has a main air flow hole, a secondary air flow hole and a paint hole, characterized in that: include: An air dividing ring, used for separating the main air flow hole and the secondary air flow hole; as well as A nozzle member for spraying the coating material, The gas dividing ring has a plurality of primary homogenizing holes evenly distributed along the first circumference. The plurality of primary homogenizing holes are connected to the main air flow hole, The nozzle member has a plurality of secondary homogenizing holes evenly distributed along a second circumference, The plurality of secondary homogenizing holes are in communication with the plurality of primary homogenizing holes.

2. The nozzle assembly according to claim 1, characterized in that: in, The diameter of the first circle is larger than that of the second circle, The primary homogenizing hole and the secondary homogenizing hole are both circular through holes. The number of the primary homogenizing holes is greater than that of the secondary homogenizing holes, and the diameter of the primary homogenizing holes is smaller than that of the secondary homogenizing holes.

3. The nozzle assembly according to claim 1, characterized in that: in, The nozzle piece comprises a nozzle piece connecting portion and a nozzle piece orifice plate portion provided with the secondary homogenizing hole. The gas dividing ring has a clearance hole matching the nozzle member connecting portion, a stepped hole matching the nozzle member orifice plate portion, and a gas dividing ring orifice plate portion provided with the primary homogenizing hole. The nozzle member connection portion passes through the clearance hole and is connected to the front end of the gun body. The orifice plate portion of the nozzle member is embedded in the stepped hole, A gap is formed between the orifice plate portion of the nozzle member and the orifice plate portion of the gas dividing ring. The gaps are respectively connected to the plurality of primary homogenizing holes and the plurality of secondary homogenizing holes.

4. The nozzle assembly according to claim 3, characterized in that: in, The nozzle member connecting portion is airtightly embedded in the clearance hole, The orifice plate portion of the nozzle member is airtightly fitted into the stepped hole.

5. The nozzle assembly according to claim 1, characterized in that: in, The front end of the gun body has a mounting groove, The cross section of the mounting groove is circular, and its inner diameter is larger than the diameter of the gas dividing ring. When the air dividing ring is disposed in the mounting groove, a gap is formed between the outer peripheral edge of the air dividing ring and the mounting groove, and the gap is communicated with the secondary air flow hole.

6. The nozzle assembly according to claim 5, characterized in that: in, The front end has a front end surface in a circular shape. On the front end surface, the outlet of the main air flow hole and the outlet of the secondary air flow hole are staggered in the circumferential direction. The air dividing ring has a cylindrical airflow dividing portion for contacting with the front end surface to separate the outlet of the main airflow hole from the outlet of the secondary airflow hole.

7. The nozzle assembly according to claim 5, characterized in that Also includes: An atomizing cap is mounted on the outside of the gas distribution ring and the nozzle member and is used to spray an atomizing gas flow; as well as The atomizing cap connecting ring is used to detachably connect the atomizing cap to the front end of the gun body.

8. The nozzle assembly according to claim 7, characterized in that: in, The atomizing cap has two protruding corners and atomizing air channels extending along the two corners respectively. The atomizing air passage is in communication with the gap.

9. The nozzle assembly according to claim 1, characterized in that: in, The gas dividing ring is made of copper.

10. A paint spray gun, characterized in that: include: Gun body; as well as The nozzle assembly is arranged at the front end of the gun body and is used to spray atomized paint. Wherein, the nozzle assembly is the nozzle assembly described in any one of claims 1-9.

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