Low-pressure spraying structure and automobile spray gun with same

Abstract

The utility model discloses a low-pressure spraying structure and an automobile spray gun with the low-pressure spraying structure, and relates to the technical field of spray guns, the low-pressure spraying structure comprises a gun body, the gun body is provided with an air pressure channel and a coating channel, and the front side of the gun body is provided with an output cavity; the spraying cover is located on the output cavity, and the spraying cover is provided with a middle buffering cavity and spraying width holes in the side edge; the coating nozzle is located between the output cavity and the spraying cover, and the coating nozzle comprises a middle nozzle and a side flow dividing ring; the arc-shaped space formed between the nozzle hemisphere part on the coating nozzle and the middle buffer cavity on the spraying cover can play a role in storing higher atmospheric pressure and providing stable air pressure supplement, so that uniform and reliable output air pressure can be kept in a low-pressure state of spraying airflow, the spraying airflow can be ensured to scatter the coating with higher viscosity more easily, and the coating quality is improved. And the atomization effect of the coating is fine and uniform, and paint mist with a better effect is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of spray guns, in particular to a low-pressure spraying structure and an automobile spray gun having the same. Background Art

[0002] Spray guns are the primary tool used in spray painting operations. Paint liquid is mixed with compressed air and pressurized before being sprayed out to form a paint mist. However, for high-viscosity paints, such as metallic paints, primers, and topcoats commonly used in the automotive industry, current spray guns often require increased air pressure to disperse the paint and achieve atomization. However, this high-pressure spraying method can easily lead to excessive paint scattering, wasting paint and causing an unstable spray pattern, resulting in an uneven application. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the prior art. To this end, the utility model proposes a low-pressure spraying structure and an automobile spray gun having the same.

[0004] The low-pressure spraying structure according to the first embodiment of the present invention includes: a gun body, the gun body having an air pressure channel and a paint channel, an output chamber is provided on the front side of the gun body, the output ends of the air pressure channel and the paint channel are both connected to the output chamber; a spray cover is located on the output chamber, the spray cover has a middle buffer chamber and a spray width hole on the side, a paint nozzle is provided on the middle buffer chamber, the middle buffer chamber is a hemispherical concave cavity structure, the middle buffer chamber and the spray width hole are connected to the output chamber; a paint nozzle is located between the output chamber and the spray cover The paint nozzle includes an intermediate nozzle and a side diverter ring. The front and rear ends of the intermediate nozzle are respectively connected to the paint nozzle and the paint channel. The intermediate nozzle includes a front nozzle hemisphere. An arc space is defined between the nozzle hemisphere and the intermediate buffer chamber. The side diverter ring separates the output chamber into a spray channel and a spray width channel. The air in the spray channel passes through the arc space as a spray airflow. The output end of the spray airflow is located in the gap between the intermediate nozzle and the paint nozzle, and the spray width channel is connected to the spray width hole.

[0005] According to some embodiments of the present invention, the intermediate nozzle also includes a converging nozzle and a straight connecting portion, the converging nozzle is located on the front side of the hemispherical portion of the nozzle, the converging nozzle extends into the paint nozzle, the gap between the converging nozzle and the paint nozzle serves as the output end of the spray channel, the straight connecting portion is located on the rear side of the hemispherical portion of the nozzle, and the straight connecting portion is connected to the paint channel.

[0006] According to some embodiments of the present invention, the maximum cross-sectional radius of the hemispherical intermediate buffer cavity is a, the maximum cross-sectional radius of the hemispherical portion of the nozzle is b, the maximum cross-sectional arc length of the intermediate buffer cavity is x, and the maximum cross-sectional arc length of the hemispherical portion of the nozzle is y, and the values ​​of a and b are a≥1.2b, and the values ​​of x and y are x≥1.1y.

[0007] According to some embodiments of the present invention, a diversion hole is provided on the side diversion ring.

[0008] According to some embodiments of the present invention, the side diverter ring includes an inner diverter plate, a separating boss, and an outer diverter plate from the inside to the outside, the diverter hole is located on the inner diverter plate, the separating boss is used to separate the spray channel and the spray width channel, and the outer diverter plate is located between the spray width channel and the spray width hole.

[0009] According to some embodiments of the present invention, an output chamber convex ring is provided on the output chamber, and the output chamber convex ring can be connected to the side diverter ring to separate the spray shape channel from the spray width channel.

[0010] According to some embodiments of the present invention, the output cavity convex ring is provided with an output cavity convex ring conical surface, and the separating boss is provided with a separating boss rear conical surface, and the output cavity convex ring conical surface can support the separating boss rear conical surface.

[0011] According to some embodiments of the present utility model, the air pressure channel includes an air input section, an air adjustment straight section, a ejector straight section, and a spray width adjustment straight section in sequence. The air input section is provided with an air joint, the air adjustment straight section is provided with an air adjustment component, the ejector straight section is provided with an ejector, and the spray width adjustment straight section is provided with a spray width adjustment component.

[0012] According to some embodiments of the present invention, the spray width adjustment straight section is connected to the spray shape channel through a spray shape branch channel, and the spray width adjustment straight section is connected to the spray shape channel through a spray shape branch channel.

[0013] According to the low-pressure spraying structure of the embodiment of the present invention, it has at least the following technical effects: the arc-shaped space formed between the nozzle hemisphere on the paint nozzle and the middle buffer cavity on the spray cover can play the role of storing a large amount of air pressure and provide stable air pressure replenishment, so that the spray airflow can maintain a uniform and reliable output air pressure under low-pressure conditions, ensuring that the spray airflow can more easily break up paint with higher viscosity, making the paint atomization effect delicate and uniform, and forming a paint mist with better effect.

[0014] The automobile spray gun according to the second embodiment of the present utility model includes the low-pressure spraying structure according to the first embodiment of the present utility model.

[0015] The automobile spray gun according to the embodiment of the present invention has at least the following beneficial effects: the arc-shaped space formed between the nozzle hemispherical portion on the paint nozzle and the middle buffer cavity on the spray cover can store a large amount of air pressure and provide stable air pressure replenishment, so that the spray airflow can maintain a uniform and reliable output air pressure even under low pressure, ensuring that the spray airflow can more easily break up the paint with higher viscosity, making the paint atomization effect delicate and uniform, forming a paint mist with better effect, which is especially suitable for metallic paints, primers, topcoats and other paints commonly used in the automotive field.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a three-dimensional diagram of the low-pressure spraying structure of the utility model;

[0019] Figure 2 This is a structural exploded view of the low-pressure spraying structure of the utility model;

[0020] Figure 3 This is a structural cross-sectional view of the utility model at the spray cover and paint nozzle positions;

[0021] Figure 4 This is a schematic diagram of the working principle of the low-pressure spraying structure of the utility model;

[0022] Figure 5 This is a three-dimensional cross-sectional view of the low-pressure spraying structure of the utility model at one angle;

[0023] Figure 6 This is a three-dimensional cross-sectional view of the low-pressure spraying structure of the utility model from another angle;

[0024] Figure 7 It is a three-dimensional cross-sectional view of the spray cover in the utility model;

[0025] Figure 8 This is a three-dimensional cross-sectional view of the coating nozzle in the utility model;

[0026] Figure 9 It is a three-dimensional cross-sectional view of the output cavity position of the gun body in the utility model.

[0027] Reference numerals:

[0028] Gun body 100, air pressure channel 110, air input section 111, air adjustment straight section 112, ejector straight section 113, spray width adjustment straight section 114, spray shape flow channel 115, spray width flow channel 116, paint channel 120, output chamber 130, spray shape channel 131, spray width channel 132, output chamber convex ring 133, output chamber convex ring conical surface 134, air plug screw 135, trigger 140, trigger guide 141, trigger shaft 142, retaining ring 143; spray cover 200, intermediate buffer chamber 210, buffer chamber rear conical surface 211, paint nozzle 220, spray width angle 230, spray width hole 231, spray width port 232, spray cover nut ring 240, spray cover front tightening ring 250, spray cover rear tightening ring 260, spray cover retaining ring 270; paint spray Nozzle 300, middle nozzle 310, convergent nozzle 311, nozzle hemispherical portion 312, straight connecting portion 313, side diverter ring 320, inner diverter plate 321, diverter hole 322, partition boss 323, partition boss rear conical surface 324, partition boss front conical surface 325, outer diverter plate 326; air connector 400; air adjustment assembly 500; ejector pin 600, ejector pin locking nut assembly 610, ejector pin guide seat 620, ejector pin guide seat locking ring 621, paint knob guide seat assembly 630, paint knob 631, ejector pin spring 632, ejector pin spring gasket 633, air valve seat assembly 640, air valve O-ring 641, air valve 650, air valve spring 651; spray width adjustment assembly 700; paint connector 800; arc space 900. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, "a plurality" means more than two, and "greater than," "less than," "exceed," etc. are understood to exclude the number itself. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number or order of the technical features indicated.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Reference below Figure 1 and Figure 2 A low-pressure spraying structure according to an embodiment of the present invention is described.

[0034] like Figure 1 and Figure 2 As shown, the low-pressure spraying structure according to an embodiment of the present invention includes a gun body 100 , a spray cover 200 and a paint nozzle 300 .

[0035] Among them, reference Figure 3 、 Figure 4 The gun body 100 has an air pressure channel 110 and a paint channel 120, and an output cavity 130 is provided on the front side of the gun body 100. The output ends of the air pressure channel 110 and the paint channel 120 are both connected to the output cavity 130; Figure 2 、 Figure 3 The spray cover 200 is located on the output chamber 130. The spray cover 200 has a middle buffer chamber 210 and a spray width hole 231 on the side. The middle buffer chamber 210 is provided with a paint nozzle 220. The middle buffer chamber 210 is a hemispherical concave cavity structure. The middle buffer chamber 210 and the spray width hole 231 are connected to the output chamber 130. The paint nozzle 300 is located between the output chamber 130 and the spray cover 200. The paint nozzle 300 includes a middle nozzle 310 and a side diverter ring 320. The front and rear ends of the middle nozzle 310 are respectively connected to the paint nozzle 220. 0. The paint channel 120 is connected. The middle nozzle 310 includes a front nozzle hemispherical portion 312. An arc-shaped space 900 is defined between the nozzle hemispherical portion 312 and the middle buffer chamber 210. The side diverter ring 320 separates the output chamber 130 into a spray channel 131 and a spray width channel 132. The air in the spray channel 131 passes through the arc-shaped space 900 as a spray-shaped airflow. The output end of the spray-shaped airflow is located in the gap between the middle nozzle 310 and the paint nozzle 220. The spray width channel 132 is connected to the spray width hole 231.

[0036] Reference Figure 5 、 Figure 6 The gun body 100 has an air pressure channel 110 and a paint channel 120 connected to high pressure air and paint respectively. Figure 3 、 Figure 9 The front side of the gun body 100 is provided with an output chamber 130. The output ends of the air pressure channel 110 and the paint channel 120 are both connected to the output chamber 130, so that the high-pressure air flow and paint are output to the output chamber 130. The spray cover 200 and the paint nozzle 300 are installed on the output chamber 130. Figure 3 、 Figure 9 The spray cover 200 has a middle buffer cavity 210 and a spray hole 231 on the side. The middle buffer cavity 210 is provided with a paint nozzle 220. Figure 3 、 Figure 8 The paint nozzle 300 includes a middle nozzle 310 and a side diverter ring 320 . The paint passes through the middle nozzle 310 and is sprayed out from the paint nozzle 220 to form paint mist.

[0037] Reference Figure 3 、 Figure 4 The central buffer chamber 210 of the spray cap 200 is a hemispherical concave structure. The central buffer chamber 210 and the spray width hole 231 are connected to the output chamber 130. The central nozzle 310 of the paint nozzle 300 includes a front nozzle hemispherical portion 312, defining an arcuate space 900 between the nozzle hemispherical portion 312 and the central buffer chamber 210. The side flow divider 320 of the paint nozzle 300 separates the output chamber 130 into a spray channel 131 and a spray width channel 132. Air is diverted to the spray channel 131 and the spray width channel 132, forming a spray-shaped airflow and a spray width airflow, respectively. The air in the spray channel 131 passes through the arcuate space 900 as a spray-shaped airflow. The output end of the spray-shaped airflow is located in the gap between the central nozzle 310 and the paint nozzle 220. That is, the spray-shaped airflow formed in the spray channel 131 passes through the arcuate space 900 and is ejected from the output gap formed between the central nozzle 310 and the paint nozzle 220. In this way, the spray airflow passes through the arc space 900 before being sprayed out. The arc space 900 can store a large amount of air pressure and provide stable air pressure supplement for the above-mentioned output gap. In this way, the spray airflow can maintain a uniform and reliable output air pressure under low pressure, ensuring that the spray airflow can more easily break up the paint with higher viscosity, making the paint atomization effect delicate and uniform, forming a paint mist with better effect.

[0038] The spray width channel 132 is communicated with the spray width hole 231 , that is, the spray width airflow formed by the air in the spray width channel 132 is sprayed out through the spray width hole 231 .

[0039] In some embodiments of the present invention, referring to Figure 8The intermediate nozzle 310 further includes a converging nozzle 311 and a linear connection portion 313. The converging nozzle 311 is located in front of the nozzle hemispherical portion 312 and extends into the paint nozzle 220. The gap between the converging nozzle 311 and the paint nozzle 220 serves as the output end of the spray pattern channel 131. The linear connection portion 313 is located behind the nozzle hemispherical portion 312 and connects to the paint channel 120. The converging nozzle 311 is located in front of the nozzle hemispherical portion 312, allowing the paint passing through the intermediate nozzle 310 to be sprayed out of the converging nozzle 311. The converging nozzle 311 extends into the paint nozzle 220, and the gap between the converging nozzle 311 and the paint nozzle 220 serves as the output end of the spray channel 131. That is, the spray airflow formed in the spray channel 131 passes through the arc space 900, the output gap formed between the intermediate nozzle 310 and the paint nozzle 220, and is then ejected from the gap between the converging nozzle 311 and the paint nozzle 220. In this way, the ejected spray airflow can be guided, so that the airflow after ejecting the paint nozzle 220 can disperse the paint in a relatively stable airflow direction to ensure the atomization effect.

[0040] In some embodiments of the present invention, referring to Figure 4 The maximum cross-sectional radius of the hemispherical middle buffer cavity 210 is a, the maximum cross-sectional radius of the nozzle hemispherical portion 312 is b, the maximum cross-sectional arc length of the middle buffer cavity 210 is x, and the maximum cross-sectional arc length of the nozzle hemispherical portion 312 is y. The values ​​of a and b are a≥1.2b, and the values ​​of x and y are x≥1.1y. This ensures that the arc space 900 has a large enough space and has a better buffering effect, ensuring that the airflow reaching the paint nozzle 220 is more stable.

[0041] In some embodiments of the present invention, referring to Figure 8 A diversion hole 322 is provided on the side diversion ring 320 so that the spray-shaped airflow formed by the spray-shaped channel 131 can pass through the diversion hole 322 and enter the arc space 900 position.

[0042] In some specific embodiments of the present invention, a plurality of diversion holes 322 are distributed around the side diversion ring 320 to increase the amount of air flow entering the middle nozzle 310 and at the same time play a better buffering role, making the air flow more uniform and smooth.

[0043] In some embodiments of the present invention, the side diverter ring 320 includes, from inside to outside, an inner diverter plate 321, a dividing boss 323, and an outer diverter plate 326. The diverter hole 322 is located on the inner diverter plate 321. The dividing boss 323 is used to separate the spray channel 131 from the spray channel 132. The outer diverter plate 326 is located between the spray channel 132 and the spray hole 231, buffering the spray airflow passing between the spray channel 132 and the spray hole 231.

[0044] In some embodiments of the present invention, referring to Figure 7 A spray angle 230 is provided on the side of the spray cover 200 , a spray hole 231 is located in the spray angle 230 , and spray ports 232 are distributed on the spray angle 230 as output ports of the spray hole 231 .

[0045] In some embodiments of the present invention, the spray cover 200 is also provided with spray holes 231 and spray ports 232 at positions surrounding the paint spray port 220 .

[0046] In some embodiments of the present invention, the spray cap 200 and the gun body 100 are threadedly connected via a spray cap nut ring 240 , and the paint nozzle 300 is located between the output chamber 130 and the spray cap 200 , so that the paint nozzle 300 and the spray cap 200 can be installed via the spray cap nut ring 240 .

[0047] In a further embodiment of the present invention, the thread of the spray cover nut ring 240 is a three-thread structure, so that the spray cover nut ring 240 can quickly lock the spray cover 200.

[0048] In a further embodiment of the present invention, referring to Figure 2 、 Figure 7 There is a front clamping ring 250 and a rear clamping ring 260 between the spray cover 200 and the gun body 100. The front clamping ring 250 applies a forward clamping thrust to the spray cover 200, and the rear clamping ring 260 applies a backward clamping thrust to the gun body 100. This can prevent the spray cover 200 from loosening forward or backward on the gun body 100, ensuring that the spray cover 200 is installed firmly and reliably.

[0049] In a further embodiment of the present invention, a spray cover retaining ring 270 is provided at the threaded connection position between the spray cover nut ring 240 and the gun body 100 to lock the spray cover nut ring 240 and the gun body 100.

[0050] In some embodiments of the present invention, referring to Figure 3 、 Figure 9 The output chamber 130 is provided with an output chamber collar 133, which can connect to the side diverter collar 320 to separate the spray pattern channel 131 from the spray width channel 132. When the coating nozzle 300 is installed in the output chamber 130, the side diverter collar 320 of the coating nozzle 300 connects with the output chamber collar 133, separating the spray pattern channel 131 from the spray width channel 132. This ensures that the spray pattern airflow in the spray pattern channel 131 and the spray width airflow in the spray width channel 132 will not be mixed due to leakage, which would affect the airflow stability.

[0051] In a further embodiment of the present invention, an output cavity convex ring 133 is provided with an output cavity convex ring conical surface 134, and a separating boss rear conical surface 324 is provided on the separating boss 323. The output cavity convex ring conical surface 134 is capable of supporting the separating boss rear conical surface 324. That is, when the paint nozzle 300 is installed on the output cavity 130, the separating boss rear conical surface 324 on the side diverter ring 320 abuts the output cavity convex ring conical surface 134 on the output cavity convex ring 133. The cooperation between the separating boss rear conical surface 324 and the output cavity convex ring conical surface 134 can improve the sealing between the side diverter ring 320 and the output cavity convex ring 133.

[0052] In a further embodiment of the present invention, a buffer chamber rear conical surface 211 is provided at the rear edge of the middle buffer chamber 210, and a separating boss front conical surface 325 is provided on the separating boss 323. When the spray cover 200 and the paint nozzle 300 are installed on the output chamber 130, the buffer chamber rear conical surface 211 is docked with the separating boss front conical surface 325, thereby improving the sealing between the middle buffer chamber 210 and the separating boss 323.

[0053] In some embodiments of the present invention, referring to Figure 5 、 Figure 6 The air pressure channel 110 sequentially includes an air input section 111, an air-regulating straight section 112, an ejector straight section 113, and a spray width regulating straight section 114. The air input section 111 is provided with an air connector 400, the air-regulating straight section 112 is provided with an air-regulating assembly 500, the ejector straight section 113 is provided with an ejector 600, and the spray width regulating straight section 114 is provided with a spray width regulating assembly 700. Air in the air pressure channel 110 sequentially passes through the air input section 111, the air-regulating straight section 112, the ejector straight section 113, and the spray width regulating straight section 114. The air connector 400 on the air input section is used to connect to an external air source. The air-regulating assembly 500 on the air-regulating straight section 112 is used to adjust the flow rate of air passing through the air-regulating straight section 112. The ejector pin 600 serves as a switch device for the middle nozzle 310 on the paint nozzle 300. Normally, the ejector pin 600 blocks the outlet of the middle nozzle 310, preventing the paint from being sprayed out. However, when the ejector pin 600 moves and no longer blocks the outlet of the middle nozzle 310, the paint can be sprayed out.

[0054] In some embodiments of the present invention, the spray width adjustment straight section 114 is connected to the spray pattern channel 131 through a spray pattern diversion channel 115, and the spray width adjustment straight section 114 is connected to the spray pattern channel 132 through a spray pattern diversion channel 116, ensuring that the air is diverted into spray pattern airflow and spray pattern airflow.

[0055] In a further embodiment of the present invention, referring to Figure 2The output cavity 130 is provided with an air plug screw 135 for blocking redundant through holes, while the other through holes serve as spray-shape branch channels 115 or spray-width branch channels 116 .

[0056] In some embodiments of the present invention, the rear side of the ejector pin 600 is located in the ejector pin straight section 113 of the air pressure channel 110 , and the front side of the ejector pin 600 passes through the coating channel 120 and extends into the coating nozzle 220 .

[0057] In some embodiments of the present invention, a ejector pin locking nut assembly 610 is provided on the gun body 100. The front side of the ejector pin 600 passes through the ejector pin locking nut assembly 610 and extends into the paint channel 120. The ejector pin locking nut assembly 610 is used to prevent the paint from leaking out from the gap between the ejector pin 600 and the gun body 100.

[0058] In some embodiments of the present invention, an ejector pin 600 is provided with an ejector pin guide 620 for guiding the ejector pin 600 to move forward and backward.

[0059] In a further embodiment of the present invention, an ejector guide seat clamping ring 621 is provided on the ejector guide seat 620 to ensure that the connection between the ejector 600 and the ejector guide seat 620 is sufficiently stable, ensuring that the ejector 600 moves accurately and reliably.

[0060] In some embodiments of the present invention, a paint knob guide assembly 630 is provided at the rear end of the ejector pin 600. A paint knob 631 is provided on the paint knob guide assembly 630. An ejector spring 632 and an ejector spring washer 633 are provided between the paint knob guide assembly 630 and the ejector pin 600. The ejector spring 632 cooperates with the ejector spring washer 633 to apply a forward thrust to the ejector pin 600. The paint knob 631 is used to adjust the forward and backward fine-tuning movement of the paint knob guide assembly 630, thereby controlling the spring force of the ejector spring 632, which is equivalent to controlling the return force of the ejector pin 600 during forward and backward movement.

[0061] In some embodiments of the present invention, an air valve seat assembly 640 is disposed within the air-regulating linear segment 112. An air valve O-ring 641 is disposed between the outer wall of the air valve seat assembly 640 and the inner wall of the air-regulating linear segment 112. The air valve seat assembly 640 has a valve seat through-hole. An air valve 650 is disposed on the ejector pin 600, with an air valve spring 651 disposed between the air valve 650 and the air valve seat assembly 640. The air valve 650 is fixed relative to the gun body 100. The ejector pin 600 can move the air valve 650. When the ejector pin 600 drives the air valve 650 forward, the air valve 650 blocks the valve seat through-hole, effectively blocking the passage between the ejector linear segment 113 and the spray width adjustment linear segment 114. When the ejector pin 600 drives the air valve 650 backward, the air valve 650 no longer blocks the valve seat through-hole, effectively allowing communication between the ejector linear segment 113 and the spray width adjustment linear segment 114. In this way, the air valve 650 and the air valve seat assembly 640 cooperate to form a switch structure between the ejector straight section 113 and the spray width adjustment straight section 114, and are controlled by the ejector 600. The air valve spring 651 between the air valve 650 and the air valve seat assembly 640 serves as a reset structure for the air valve 650 and the air valve seat assembly 640.

[0062] In some embodiments of the present invention, a trigger 140 is provided on the gun body 100. The trigger 140 is used to control the forward and backward movement of the ejector pin 600 and serves as a switch device of the spray gun of the present invention.

[0063] It is conceivable that the trigger 140 can be controlled manually or automatically in other ways.

[0064] In a further embodiment of the present invention, the gun body 100 and the trigger 140 are connected by a trigger shaft 142, and the trigger 140 can rotate and swing along the trigger shaft 142. The trigger shaft 142 and the gun body 100 are fixed by a retaining ring 143 to prevent the trigger shaft 142 from loosening.

[0065] In a further embodiment of the present invention, the trigger 140 and the ejector pin 600 are connected via a trigger guide 141 .

[0066] The automobile spray gun according to the second embodiment of the present utility model includes the low-pressure spraying structure according to the first embodiment of the present utility model.

[0067] According to the automobile spray gun of the embodiment of the present invention, by adopting the above-mentioned low-pressure spraying structure, the arc space formed between the nozzle hemisphere on the paint nozzle and the middle buffer cavity on the spray cover can play the role of storing a large amount of air pressure and provide stable air pressure replenishment. In this way, the spray airflow can maintain a uniform and reliable output air pressure under low-pressure conditions, ensuring that the spray airflow can more easily break up the paint with higher viscosity, so that the paint atomization effect is delicate and uniform, forming a paint mist with better effect, and also adapting to the miniaturized design of the automobile spray gun, and can improve the vibration and noise of the automobile spray gun, enhance the user experience effect, and is especially suitable for metallic paints, primers, topcoats and other paints commonly used in the automotive field.

[0068] Other structures and operations of the automobile spray gun according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0069] Reference below Figure 1 、 Figure 2 、 Figure 3 The low-pressure spraying structure according to the embodiment of the present utility model is described in detail with a specific embodiment. It is worth noting that the following description is only for illustrative purposes and is not intended to limit the utility model.

[0070] like Figure 1 、 Figure 2 and Figure 3 As shown, the embodiment includes a gun body 100 , a spray cover 200 , a paint nozzle 300 , an air joint 400 , an air adjustment assembly 500 , a ejector pin 600 , a spray width adjustment assembly 700 , and a paint joint 800 .

[0071] The gun body 100 is provided with an air pressure channel 110 and a paint channel 120. The air pressure channel 110 comprises, in order, an air input section 111, an air adjustment linear section 112, an ejector linear section 113, and a spray width adjustment linear section 114. An air connector 400 is mounted on the air input section 111 of the air pressure channel 110, an air adjustment assembly 500 is mounted on the air adjustment linear section 112, and a spray width adjustment assembly 700 is mounted on the spray width adjustment linear section 114. A paint connector 800 is mounted on the paint channel 120. A trigger 140 is provided on the exterior of the gun body 100.

[0072] An output chamber 130 is provided on the front side of the gun body 100. The output chamber 130 is separated into a spray shape channel 131 and a spray width channel 132 by an output chamber convex ring 133. The spray width adjustment straight section 114 is connected to the spray shape channel 131 and the spray width channel 132 through the spray shape branch channel 115 and the spray width branch channel 116 respectively.

[0073] A spray cover 200 is provided on the output chamber 130 , and the paint nozzle 300 is located between the output chamber 130 and the spray cover 200 . The spray cover 200 is mounted on the gun body 100 via a spray cover nut ring 240 .

[0074] The spray cap 200 is equipped with a central buffer chamber 210, a paint nozzle 220, and a spray angle 230. The paint nozzle 300 includes a central nozzle 310 and a side diverter ring 320. From front to back, the central nozzle 310 includes a convergent nozzle 311, a nozzle hemispherical portion 312, and a linear connecting portion 313. The side diverter ring 320 includes, from inside to outside, an inner diverter plate 321, a separating boss 323, and an outer diverter plate 326. The inner diverter plate 321 is provided with diverter holes 322. An arc-shaped space 900 is defined between the nozzle hemispherical portion 312 and the central buffer chamber 210.

[0075] The rear side of ejector pin 600 is located within ejector straight section 113 of air pressure passage 110, while the front side of ejector pin 600 extends through paint passage 120 into paint nozzle 220. A paint knob guide assembly 630 is located on the rear side of ejector pin 600. An air valve seat assembly 640 is located within the air control straight section 112, and an air valve 650 is installed on ejector pin 600.

[0076] According to the low-pressure spraying structure of the embodiment of the present invention, at least the following effects can be achieved through such an arrangement. The arc space 900 formed between the nozzle hemispherical portion 312 and the middle buffer chamber 210 can play the role of storing a large amount of air pressure and provide stable air pressure replenishment, so that the spray airflow can maintain a uniform and reliable output air pressure under low pressure, ensuring that the spray airflow can more easily break up the paint with higher viscosity, so that the paint atomization effect is delicate and uniform, forming a paint mist with better effect; the spray cover nut ring 240 adopts a three-line thread structure, so that the spray cover nut ring 240 can quickly lock the spray cover 200 and fix the paint nozzle 300; the output chamber 130 separates the spray channel 131 and the spray width channel 132, so that the air is stably diverted to form a spray airflow and a spray width airflow respectively, thereby improving the stability of the air supply to the paint mist.

[0077] Throughout this specification, references to the terms "some embodiments" or "it is contemplated that" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0078] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low-pressure spraying structure, characterized in that: include: A gun body (100), the gun body (100) having an air pressure channel (110) and a paint channel (120), an output cavity (130) being provided on the front side of the gun body (100), and the output ends of the air pressure channel (110) and the paint channel (120) being both in communication with the output cavity (130); A spray cover (200) is located on the output chamber (130), the spray cover (200) having a middle buffer chamber (210) and spray holes (231) on the side, the middle buffer chamber (210) being provided with a paint nozzle (220), the middle buffer chamber (210) being a hemispherical concave structure, the middle buffer chamber (210), the spray holes (231) being in communication with the output chamber (130); The coating nozzle (300) is located between the output chamber (130) and the spray cover (200). The coating nozzle (300) includes a middle nozzle (310) and a side diverter ring (320). The front and rear ends of the middle nozzle (310) are respectively connected to the coating nozzle (220) and the coating channel (120). The middle nozzle (310) includes a front nozzle hemisphere (312). The nozzle hemisphere (312) is connected to the middle buffer chamber (21 0), an arc-shaped space (900) is defined between the middle nozzle (310) and the coating nozzle (220), the side flow dividing ring (320) separates the output chamber (130) into a spray channel (131) and a spray width channel (132), the air in the spray channel (131) passes through the arc-shaped space (900) as a spray-shaped airflow, the output end of the spray-shaped airflow is located in the gap between the middle nozzle (310) and the coating nozzle (220), and the spray width channel (132) is connected to the spray width hole (231).

2. The low-pressure spraying structure according to claim 1, characterized in that: The intermediate nozzle (310) further includes a convergent nozzle (311) and a straight connecting portion (313), wherein the convergent nozzle (311) is located at the front side of the nozzle hemispherical portion (312), and the convergent nozzle (311) extends into the paint nozzle (220), and the gap between the convergent nozzle (311) and the paint nozzle (220) serves as the output end of the spray channel (131), and the straight connecting portion (313) is located at the rear side of the nozzle hemispherical portion (312), and the straight connecting portion (313) is connected to the paint channel (120).

3. The low-pressure spraying structure according to claim 1, characterized in that: The maximum cross-sectional radius of the hemispherical intermediate buffer cavity (210) is a, the maximum cross-sectional radius of the hemispherical portion (312) of the nozzle is b, the maximum cross-sectional arc length of the intermediate buffer cavity (210) is x, the maximum cross-sectional arc length of the hemispherical portion (312) of the nozzle is y, and the values ​​of a and b are a≥1.2b, and the values ​​of x and y are x≥1.1y.

4. The low-pressure spraying structure according to claim 1, characterized in that: The side diverter ring (320) is provided with a diverter hole (322).

5. The low-pressure spraying structure according to claim 4, characterized in that: The side diverter ring (320) includes an inner diverter plate (321), a separation boss (323), and an outer diverter plate (326) from the inside to the outside. The diverter hole (322) is located on the inner diverter plate (321). The separation boss (323) is used to separate the spray channel (131) and the spray channel (132). The outer diverter plate (326) is located between the spray channel (132) and the spray hole (231).

6. The low-pressure spraying structure according to claim 5, characterized in that: The output cavity (130) is provided with an output cavity convex ring (133), and the output cavity convex ring (133) can be connected to the side diverter ring (320) to separate the spray shape channel (131) from the spray width channel (132).

7. The low-pressure spraying structure according to claim 6, characterized in that: The output cavity convex ring (133) is provided with an output cavity convex ring conical surface (134), and the separation boss (323) is provided with a separation boss rear conical surface (324). The output cavity convex ring conical surface (134) can support the separation boss rear conical surface (324).

8. The low-pressure spraying structure according to claim 1, characterized in that: The air pressure channel (110) comprises an air input section (111), an air adjustment straight section (112), an ejector straight section (113), and a spray width adjustment straight section (114) in sequence; the air input section (111) is provided with an air joint (400); the air adjustment straight section (112) is provided with an air adjustment component (500); the ejector straight section (113) is provided with an ejector (600); and the spray width adjustment straight section (114) is provided with a spray width adjustment component (700).

9. The low-pressure spraying structure according to claim 8, characterized in that: The spray width adjustment straight section (114) is communicated with the spray shape channel (131) via a spray shape branch channel (115), and the spray width adjustment straight section (114) is communicated with the spray width channel (132) via a spray width branch channel (116).

10. An automobile spray gun, characterized in that: The invention comprises the low-pressure spraying structure according to any one of claims 1 to 9.

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