A spray gun

Abstract

The utility model relates to a spray gun technical field, concretely relates to a spray gun. The utility model provides a spray gun, including gun body, gear position adjusting mechanism, nozzle and valve needle, the gun body is equipped with export cavity, gas passage and coating cavity, the gas passage is linked with export cavity intercommunication, the export cavity is connected with the nozzle, one end of valve needle is located in the nozzle, and the other end is equipped with gear position adjusting mechanism. The utility model discloses the knob and the limiting piece that are set, and workers or management personnel can according to the working condition, first rotate the knob to corresponding turns, then install the limiting piece, because the length of the limiting piece to the limiting part is exposed outside greater than the distance of the knob to the limiting part, therefore, when the worker uses, can limit the knob, make its angle range not exceed 360 degrees of knob, reduce coating waste, be favorable to cost management.

Description

Technical Field

[0001] This utility model relates to the field of spray gun technology, and specifically to a spray gun. Background Technology

[0002] Currently, an air spray gun includes a spray gun body, a paint valve needle, a nozzle, a trigger, and a paint knob. The spray gun body contains a valve needle, one end of which is inserted into the inner hole of the nozzle, and the other end of which is connected to the paint knob. By turning the paint knob multiple times, the relative position of the valve needle and the nozzle can be adjusted to change the amount of paint sprayed. Each counterclockwise turn of the paint knob increases the amount of paint sprayed slightly. By pulling the trigger, the position of the valve needle relative to the nozzle can be changed to spray paint.

[0003] However, for convenience and ease, workers generally tend to turn the paint flow knob counterclockwise to the maximum to obtain the maximum paint output, which leads to excessive use of paint, serious waste, and is not conducive to cost management. Utility Model Content

[0004] (a) The problem this utility model aims to solve is that, for convenience and ease, workers generally tend to turn the paint flow knob counterclockwise to the maximum to obtain the maximum paint output. However, this leads to excessive paint use and serious waste, and the paint film may be too thick, which is not conducive to quality control and cost management.

[0005] (II) Technical Solution The present invention provides a spray gun, comprising a gun body, a gear adjustment mechanism, a nozzle, and a valve needle; The gun body is provided with an outlet cavity, a gas passage, and a coating cavity, and the gas passage is connected to the outlet cavity; The nozzle is connected to the outlet cavity, and one end of the valve needle is located inside the nozzle, while the other end is provided with the gear adjustment mechanism. The gear adjustment mechanism includes a knob and a limiting member. The gun body has a limiting part, and the limiting member is detachably connected to the knob. The distance from the knob to the limiting part is less than the length of the limiting member.

[0006] According to one embodiment of the present invention, the gear adjustment mechanism further includes a dial, which is located on the side of the knob near the nozzle.

[0007] According to one embodiment of the present invention, the knob is provided with a threaded groove, the limiting member is a round rod, and one end of the round rod is screwed into the threaded groove.

[0008] According to one embodiment of the present invention, the nozzle is provided with a spray hole structure, and the side wall of the nozzle is provided with a plurality of atomizing holes, which are evenly arranged around the axis of the nozzle.

[0009] According to one embodiment of the present invention, the spray hole structure includes a first conical hole, wherein the diameter of one end of the first conical hole near the limiting portion is smaller than the diameter of the other end thereof.

[0010] According to one embodiment of the present invention, an air cap is connected to one side of the outlet cavity, and the air cap includes a connecting part and a spray angle; The spray angles are symmetrically connected to one side of the connecting part. A first cavity is provided inside the connecting part, and a second cavity connected to the first cavity is provided inside the spray angle. Multiple fan-shaped air holes are opened on the side of the two spray angles that are close to each other.

[0011] According to one embodiment of the present invention, the inclination angle of the fan-shaped air hole is between 15° and 25°.

[0012] According to one embodiment of the present invention, the gear adjustment mechanism includes a retaining ring, a spring, and a guide seat; The guide seat is located on one side of the knob and is connected to the gun body. The guide seat contains the retaining ring, and the spring is located between the retaining ring and the knob.

[0013] According to one embodiment of the present invention, the gas channel includes an inlet channel, a first channel, and a second channel that are connected to each other; An air conditioning component is provided at one end of the first flow channel, a fan width adjustment component is provided at one end of the second flow channel, and the other end of the second flow channel is connected to the outlet cavity, which is connected to the first cavity.

[0014] According to one embodiment of the present invention, a trigger is oscillatingly connected to the gun body, and the trigger is throttle-connected to the valve needle through a transmission structure.

[0015] The beneficial effects of this utility model are: With the addition of knobs and limiters, workers or managers can first turn the knob to the corresponding number of rotations according to the working conditions, and then install the limiters. Since the exposed length of the limiters to the limiters is greater than the distance between the knobs and the limiters, the knobs can be limited to a range of angles not exceeding 360 degrees when used by workers. This allows for fine-tuning of the paint amount without causing excessive paint use, reducing paint waste and facilitating cost management. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A front view structural diagram of the spray gun provided in an embodiment of this utility model; Figure 2 A cross-sectional view of the spray gun provided in an embodiment of this utility model; Figure 3 Provided for the embodiments of this utility model Figure 2 Enlarged view of section A; Figure 4 A cross-sectional view of the nozzle provided in an embodiment of this utility model; Figure 5 A cross-sectional view of the nozzle and valve needle provided in an embodiment of this utility model; Figure 6 A cross-sectional view of the gear adjustment mechanism and valve needle provided in the embodiment of this utility model.

[0018] Icons: 1. Gun body; 11. Exit chamber; 12. Paint chamber; 121. Paint hole; 13. Limiting part; 14. First flow channel; 15. Second flow channel; 2. Gear adjustment mechanism; 21. Knob; 22. Limiting part; 23. Dial; 24. Threaded groove; 25. Retaining ring; 26. Spring; 27. Guide seat; 3. Nozzle; 31. Spray hole structure; 311. First conical hole; 32. Atomizing hole; 4. Valve needle; 5. Air cap; 51. Connecting part; 52. Spray angle; 53. Fan-shaped air hole; 54. Center hole; 55. Negative pressure air hole; 6. Air conditioning assembly; 7. Fan-shaped adjustment assembly; 8. Trigger. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1-6 As shown, one embodiment of the present invention provides a spray gun, including a gun body 1, a gear adjustment mechanism 2, a nozzle 3 and a valve needle 4; The gun body 1 is provided with an outlet cavity 11, a gas passage and a coating cavity 12, and the gas passage is connected to the outlet cavity 11; A nozzle 3 is connected inside the outlet cavity 11, and one end of the valve needle 4 is located inside the nozzle 3, while the other end is equipped with a gear adjustment mechanism 2. The gear adjustment mechanism 2 includes a knob 21 and a limiting member 22. The gun body 1 has a limiting part 13. The limiting member 22 is detachably connected to the knob 21. The distance from the knob 21 to the limiting part 13 is less than the length of the limiting member 22.

[0021] With the knob 21 and the limiter 22, workers or managers can first turn the knob 21 counterclockwise to the corresponding number of turns according to the working conditions, and then install the limiter 22. Since the exposed length of the limiter 22 to the limiter 13 is greater than the distance between the knob 21 and the limiter 13, when the worker uses it, when the knob 21 is rotated clockwise or counterclockwise to a certain angle, the limiter 22 contacts the limiter 13, thereby limiting the knob 21 so that the angle range of the knob 21 does not exceed 360 degrees. This allows for fine adjustment of the amount of paint without causing excessive use of paint, reducing paint waste and facilitating cost management.

[0022] It should be noted that although the limiting component 22 can be disassembled, compared to the traditional knob which can be rotated directly, disassembling and assembling the limiting component 22 involves more steps. It is no longer as convenient as the knob 21 which can be turned many times directly. Therefore, when using it, due to the limitation of the limiting component 22, workers will no longer subconsciously adjust the spray volume directly to the maximum, thus achieving the effect of controlling the spray volume.

[0023] This spray gun can significantly reduce paint and solvent emissions, greatly saving paint usage. Actual tests show that using this spray gun increases paint utilization to 30%-40% (compared to 10%-20% with traditional spray guns), and reduces paint consumption by 25%.

[0024] According to one embodiment of this utility model, the gear adjustment mechanism 2 further includes a dial 23, which is located on the side of the knob 21 near the nozzle 3. Through the dial 23, workers can intuitively see the gear corresponding to the current single spray volume, thus saving time during fine-tuning.

[0025] According to one embodiment of this utility model, the knob 21 has a threaded groove 24, and the limiting member 22 is a round rod, one end of which is screwed into the threaded groove 24. The exposed part of the round rod has a smooth surface, making it difficult for workers to quickly disassemble the round rod by hand, reducing the convenience of manual operation, and preventing workers from always wanting to adjust the spray volume to the maximum during operation. In addition, an internal hexagonal hole is provided on the end of the round rod away from the threaded groove 24, which allows the round rod to be disassembled by turning it with a tool when a large range of spray volume needs to be adjusted.

[0026] It should be noted that a paint hole 121 is provided on one side of the paint chamber 12, which can be connected to the feed pipe so that the paint can enter the paint chamber 12.

[0027] According to one embodiment of this utility model, the nozzle 3 is provided with a spray hole structure 31, and multiple atomizing holes 32 are provided on the side wall of the nozzle 3. The multiple atomizing holes 32 are evenly arranged around the axis of the nozzle 3. The spray hole structure 31 is connected to the paint chamber 12. Since a valve needle 4 is provided in the spray hole structure 31, when the trigger 8 drives the valve needle 4 to move to the right (the right side refers to the end away from the air cap 5) through the transmission structure, an annular gap is formed between the spray hole structure 31 and the valve needle 4, and the paint in the paint chamber 12 is sprayed out through the annular gap. There are six atomizing holes 32, and the tilt angle is preferably 60°-80° (the tilt angle refers to the angle between the axis of the atomizing hole 32 and the axis of the nozzle 3), which can generate eddy shear force.

[0028] According to one embodiment of the present invention, the spray nozzle structure 31 includes a first conical hole 311, a second conical hole, and a straight hole connected in sequence. The diameter of the end of the first conical hole 311 near the limiting part 13 is smaller than the diameter of its other end (i.e., the diameter of the left end of the first conical hole 311 is larger). The small diameter end of the second conical hole has the same diameter as the small diameter end of the first conical hole 311, and the large diameter end of the second conical hole has the same diameter as the straight hole and is connected to the straight hole. The diameter of the straight hole is larger than the maximum diameter of the first conical hole 311. The front end of the valve needle 4 is conical. The front end of the valve needle 4 and the first conical hole 311 in the spray nozzle structure 31 cooperate to prevent the paint in the paint cavity 12 from being sprayed out. A central hole 54 connected to the first cavity is provided on the connecting part 51. The central hole 54 is used to accommodate the head of the nozzle 3 (i.e., the part where the first conical hole 311 is opened), and its gap is less than or equal to 0.1 mm, forming a primary atomization cavity.

[0029] According to one embodiment of the present invention, an air cap 5 is connected to one side of the outlet 11. The air cap 5 includes a connecting part 51 and a spray angle 52. One side of the connecting part 51 is symmetrically connected with a spray angle 52. The connecting part 51 is provided with a first cavity, and the spray angle 52 is provided with a second cavity that communicates with the first cavity. Multiple fan-shaped air holes 53 are opened on the side of the two spray angles 52 that are close to each other.

[0030] Each spray angle 52 is provided with two fan-shaped air holes 53. The fan-shaped air holes 53 can be straight holes or conical holes. When the fan-shaped air holes 53 are conical holes, the cross-sectional area of ​​the end of the fan-shaped air hole 53 closest to the second cavity is smaller than the cross-sectional area of ​​the other end.

[0031] It should be noted that there are two negative pressure vents 55 symmetrically connected on both sides of the central hole 54, and the Venturi effect is used to eject the coating at the negative pressure vents 55.

[0032] According to one embodiment of this utility model, the tilt angle of the fan-shaped air hole 53 is between 15° and 25°, and by cooperating with the fan width adjustment component 7, the spray width can be controlled. When the valve needle 4 is parallel to the horizontal plane, the tilt angle of the fan-shaped air hole 53 refers to the angle formed between the axis of the fan-shaped air hole 53 and the vertical plane.

[0033] According to one embodiment of the present invention, the gear adjustment mechanism 2 includes a retaining ring 25, a spring 26, and a guide seat 27; The knob 21 includes a threaded portion and a first mounting portion connected together. A limiting member 22 is screwed onto the first mounting portion. The guide seat 27 includes a second mounting portion and a third mounting portion connected together. The second mounting portion is connected inside the gun body 1, and the threaded portion of the knob 21 is screwed into the third mounting portion. The dial 23 is fitted onto the second mounting portion of the guide seat 27. The third mounting portion of the guide seat 27 and the gun body 1 cooperate to hold the dial 23 in place. The bottom ends of the dial 23 have protrusions, and the bottom of the dial 23 contacts the limiting member 13. The two protrusions cooperate to prevent the dial 23 from rotating arbitrarily during assembly. A retaining ring 25 is provided inside the guide seat 27. A spring 26 is provided between the retaining ring 25 and the knob 21. The retaining ring 25 is fixedly connected to the valve needle 4. The knob 21 has an inner cavity, and one end of the spring 26 abuts against the side wall of the inner cavity of the knob 21.

[0034] like Figure 6 As shown, spring 26 is always in a compressed state, providing a thrust to the valve needle 4 to move towards the air cap 5. One end of spring 26 abuts against the inner wall of knob 21, and the other end abuts against retaining ring 25. At this time, the valve needle 4 and nozzle 3 cooperate to prevent paint from being sprayed out. When the trigger 8 is driven, the valve needle 4 is moved to the right through the transmission structure, and spring 26 is further compressed. At this time, the right side of valve needle 4 abuts against the inner wall of knob 21, causing paint to be sprayed out from paint chamber 12 through the annular gap formed between valve needle 4 and nozzle 3. By turning knob 21, the distance between retaining ring 25 and inner wall of knob 21 can be increased, thereby increasing the annular gap between valve needle 4 and nozzle 3 and increasing the amount of paint sprayed at one time.

[0035] According to one embodiment of the present invention, the gas channel includes an inlet channel, a first channel 14, and a second channel 15 that are connected to each other; One end of the first flow channel 14 is provided with an air conditioning component 6, one end of the second flow channel 15 is provided with a fan width adjustment component 7, and the other end of the second flow channel 15 is connected to the outlet cavity 11, which is connected to the first cavity.

[0036] Compressed gas enters the second channel 15 through the first channel 14 via the inlet air passage and then enters the outlet mouth 11. It then splits into three paths from the outlet mouth 11. One path passes through the through hole at the front end of the gun body 1 and enters the second chamber of the spray angle 52 and is then ejected from the fan-shaped air hole 53. Another path is ejected from the negative pressure air hole 55 through multiple atomizing holes 32. The last path comes out from the multiple atomizing holes 32 and is ejected from the slit (high airflow slit) between the nozzle 3 and the central hole 54.

[0037] According to one embodiment of the present invention, a trigger 8 is oscillatingly connected to the gun body 1. The trigger 8 is connected to the valve needle 4 through a transmission structure. When the trigger 8 is pulled, the valve needle 4 is driven to move along its axial direction through the transmission structure. This is the prior art and will not be described in detail.

[0038] Specifically, pulling the trigger 8 causes the valve needle 4 to move backward through the transmission structure, forming an annular gap between the valve needle 4 and the nozzle 3 that allows the paint to be sprayed out. At the same time, compressed gas enters the outlet cavity 11 through the air inlet channel, the first flow channel 14 and the second flow channel 15 in sequence. The compressed gas flows through multiple fan-shaped air holes 53, generating a symmetrical stretching force on the liquid film to form a thin sheet-like liquid curtain. The compressed gas is also sprayed out from the central hole 54 and the negative pressure air hole 55 through the atomizing hole 32 to form a rotating shear field that tears the edge of the liquid film. When the high-speed airflow sweeps across the surface of the liquid film, a local low-pressure area is generated due to the Bernoulli effect, which causes the cavitation bubbles inside the paint to collapse and burst the liquid column from the inside. The instability of the gas-liquid interface amplifies and strips the surface waves of the liquid film, generating uniform droplets with a particle size of 20-50μm. The fan-shaped airflow converges 2-3 mm in front of nozzle 3, constraining droplets to move within the low-turbulence laminar core region, significantly reducing droplet collision and merging. The ejector airflow generated by the negative pressure orifice 55 adsorbs edge-dispersed droplets, improving paint utilization. It can ensure uniform compressed air flow even at lower compressed air pressures. This invention's spray gun achieves the same or even better atomization effect at lower air pressures, greatly reducing energy consumption.

[0039] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spray gun, characterized in that, It includes the gun body (1), the gear adjustment mechanism (2), the nozzle (3) and the valve needle (4); The gun body (1) is provided with an outlet cavity (11), a gas passage and a coating cavity (12), and the gas passage is connected to the outlet cavity (11); The nozzle (3) is connected inside the outlet cavity (11), and one end of the valve needle (4) is located inside the nozzle (3), while the other end is provided with the gear adjustment mechanism (2). The gear adjustment mechanism (2) includes a knob (21) and a limiting member (22). The gun body (1) has a limiting part (13). The limiting member (22) is detachably connected to the knob (21). The distance from the knob (21) to the limiting part (13) is less than the length of the limiting member (22).

2. A spray gun according to claim 1, characterized in that, The gear adjustment mechanism (2) also includes a dial (23), which is located on the side of the knob (21) near the nozzle (3).

3. A spray gun according to claim 1, characterized in that, The knob (21) has a threaded groove (24), and the limiting member (22) is a round rod, one end of which is screwed into the threaded groove (24).

4. A spray gun according to claim 1, characterized in that, The nozzle (3) is provided with a spray hole structure (31), and a plurality of atomizing holes (32) are provided on the side wall of the nozzle (3). The plurality of atomizing holes (32) are evenly arranged around the axis of the nozzle (3).

5. A spray gun according to claim 4, characterized in that, The spray nozzle structure (31) includes a first conical hole (311), the diameter of the first conical hole (311) near the limiting part (13) is smaller than the diameter of its other end.

6. A spray gun according to claim 1, characterized in that, An air cap (5) is connected to one side of the outlet (11), and the air cap (5) includes a connecting part (51) and a spray angle (52). The spray angle (52) is symmetrically connected to one side of the connecting part (51). The connecting part (51) is provided with a first cavity, and the spray angle (52) is provided with a second cavity that communicates with the first cavity. Multiple fan-shaped air holes (53) are opened on the side of the two spray angles (52) that are close to each other.

7. A spray gun according to claim 6, characterized in that, The inclination angle of the fan-shaped air hole (53) is between 15° and 25°.

8. A spray gun according to claim 2, characterized in that, The gear adjustment mechanism (2) includes a retaining ring (25), a spring (26) and a guide seat (27); The guide seat (27) is located on one side of the knob (21). The guide seat (27) is connected to the gun body (1). The guide seat (27) contains the retaining ring (25). The spring (26) is located between the retaining ring (25) and the knob (21).

9. A spray gun according to claim 6, characterized in that, The gas passage includes an inlet passage, a first flow channel (14), and a second flow channel (15) that are connected to each other. An air conditioning component (6) is provided at one end of the first flow channel (14), a fan width adjustment component (7) is provided at one end of the second flow channel (15), and the other end of the second flow channel (15) is connected to the outlet cavity (11), which is connected to the first cavity.

10. A spray gun according to claim 1, characterized in that, A trigger (8) is oscillatingly connected to the gun body (1), and the trigger (8) is connected to the valve needle (4) through a transmission structure.

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