Spray head capable of preventing aerosol from rebounding

Abstract

The utility model discloses a spray head capable of preventing aerosol from rebounding, which comprises a nozzle body arranged on a spray gun body, a coating channel arranged on the nozzle body, a coating nozzle communicated with the coating channel, a coating needle inserted into the coating nozzle, an air cover of the nozzle body screwed on the spray gun body through an air nozzle ring, and the air cover is provided with an annular part, a flat part and two angular parts. An annular opening is formed in the middle of the convex part of the flat part, the coating nozzle and the annular opening form a central air hole, and an auxiliary air hole is formed in the convex part; and each angular part is provided with three side air holes which are continuously and sequentially arranged along the spraying direction and are obliquely arranged. By arranging the three side air holes matched with the auxiliary air holes and the central air hole, air energy can be conveniently dispersed under the same pressure, so that the air pressure pointing to paint aerial fog is reduced on the premise of ensuring the air quantity, the diffusion of the paint aerial fog and the fineness of particles are ensured, and the air quality is improved. And aerosol rebounding caused by spraying the coating aerosol on the product is avoided, and meanwhile, the coating is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of spraying, especially to a spray head preventing aerosol rebound. BACKGROUND

[0002] The air spray gun is formed by compressed air injection to form negative pressure, and the paint is sprayed under the driving of compressed air, fully atomized under the impact mixing of airflow, and the paint mist is shot to the base surface to form a paint film under the driving of airflow.

[0003] However, the existing spray gun adjusts the air pressure of compressed air to make the paint achieve the effect of diffusion and fine particles during the spraying process, but using high air pressure often causes the paint aerosol to rebound to the back side to the staff, which not only affects the spraying effect, but also threatens the safety and health of the operator, and also pollutes the environment, in addition, it also causes waste of paint. Therefore, it is particularly important to develop a spray head that can prevent aerosol rebound. SUMMARY

[0004] In order to overcome the above-mentioned defects, the utility model provides a spray head preventing aerosol rebound to solve the problem of aerosol rebound generated in the spraying process of the existing spray gun.

[0005] The utility model discloses a spray head preventing aerosol rebound, including the nozzle body of being located in the front end of the spray gun body, the nozzle body has the paint channel, the middle of the paint channel leads into the paint nozzle, the paint needle inserts the paint nozzle, the air cover of the nozzle body is screwed on the spray gun body through the air nozzle ring, the air cover has the annular part of abutting at the spray gun body, the flat part is connected to the annular part, and two symmetrical settings are arranged in the flat part both ends and along the jet direction forward extension The angular part, the middle part of the flat part is equipped with the annular protruding part, the middle of the protruding part is equipped with the annular opening for the paint nozzle, and the paint nozzle and the annular opening form the annular center air hole, the protruding part is also provided with the auxiliary air hole along the jet direction through, every angular part has three side air holes along the jet direction continuous order arrangement and the communication of air channel, and every side air hole is inclined to set along the jet direction.

[0006] As a further improvement of the utility model, the two angular parts are mirror image arranged with the jet direction as the mirror image line, and each angular part has an inner wall surface arranged towards the side of the jet direction and a front end surface arranged at the front end of the inner wall surface.

[0007] The side air hole is a cylindrical through hole, and the center axes of the three side air holes on each angular part are arranged parallel to each other and extend through the inner wall surface at a specific angle relative to the jet direction.

[0008] As a further improvement of the utility model, the included angle between the central axis of the side air hole and the spraying direction ranges from 100° to 130°.

[0009] As a further improvement of the utility model, the inner wall surface is a concave surface arranged around the spraying direction, and three side air holes are arranged at the bottom of the concave surface.

[0010] As a further improvement of the utility model, the inner wall surface has a first wall surface and a second wall surface connected in sequence along the spraying direction from the outer edge of the flat portion to the front end surface;

[0011] Among them, one side air hole is arranged on the first wall surface, and the remaining two side air holes are arranged on the second wall surface.

[0012] As a further improvement of the utility model, the first wall surface is arranged to be inclined outward from back to front with respect to the spraying direction, and the second wall surface is arranged to be inclined outward from the front end of the first wall surface to the front end surface;

[0013] In addition, the inclination angle of the first wall surface with respect to the spraying direction is greater than the inclination angle of the second wall surface with respect to the spraying direction.

[0014] As a further improvement of the utility model, the paint nozzle extends forward beyond the convex portion along the spraying direction, but does not exceed the rear end of the first wall surface.

[0015] As a further improvement of the utility model, the auxiliary air hole is a cylindrical through hole, and is configured as two groups, and the two groups of auxiliary air holes are also mirror-imaged on the inner side of the two angle-shaped portions with the spraying direction as the mirror line;

[0016] Each group of auxiliary air holes is provided with three, and the three auxiliary air holes in each group are distributed in an equilateral triangle.

[0017] The utility model has the beneficial effects that by arranging three side air holes on the angle-shaped portion of the air cover, and matching with auxiliary air holes and central air holes, air energy can be dispersed under the same pressure, so that the air pressure of the paint mist is reduced under the premise of ensuring the air volume, the diffusion of the paint mist and the fine particle effect can be realized, and the paint mist is prevented from rebounding when sprayed on the product, and the effect of saving paint is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a structure schematic view of the spray gun of the utility model;

[0019] Fig. 2The exploded structural schematic view of the spray gun body and the nozzle body of the utility model;

[0020] Fig. 3 The sectional view of the nozzle body of the utility model;

[0021] Fig. 4 The utility model discloses Fig. 3 A place amplification schematic view of the utility model.

[0022] The following description is made in conjunction with the drawings:

[0023] 1, spray gun body;2, nozzle body;20, air nozzle ring;21, air cover;

[0024] 211, annular part;212, flat part;213, angular part;2131, side air hole;2132, inner wall surface;21321, first wall surface;21322, second wall surface;2133, front end face;214, convex part;2141, annular opening;2142, auxiliary air hole;215, center air hole;216, air passage;3, coating passage;4, coating nozzle;5, coating needle;6, passage;Z, spray direction. Specific implementation

[0025] The following description is made in conjunction with the drawings:

[0026] Refer to Figs. 1 to 4The utility model provides a kind of anti-mist rebounding spray head, including the nozzle body 2 being arranged in the front end of the spray gun body 1, the nozzle body 2 has cylindrical coating channel 3, the middle of the coating channel 3 is led into coating nozzle 4, hollow coating needle 5 is inserted into the coating nozzle 4, air cover 21 of the nozzle body 2 is screwed on the spray gun body 1 by means of air nozzle ring 20, generally air cover 21 and air nozzle ring 20 can be made of plastic injection molding according to production and cost demand, it can also be metal pressure casting.The air cover 21 has annular portion 211 abutting on the spray gun body 1, flat portion 212 connected to the annular portion 211, and two angular portions 213 symmetrically arranged at both ends of the flat portion 212 and extending forward along the spraying direction Z;The middle of the flat portion 212 is provided with annular protruding portion 214, the middle of the protruding portion 214 is provided with annular opening 2141 for the coating nozzle 4 to pass through, and the annular central air hole 215 is formed between the coating nozzle 4 and the annular opening 2141;The protruding portion 214 is also provided with auxiliary air hole 2142 penetrating along the spraying direction Z;Each angular portion 213 has three side air holes 2131 arranged in sequence along the spraying direction Z and communicated with air channel 216, each side air hole 2131 is inclinedly arranged along the spraying direction Z, and the side air hole 2131 is supplied with compressed air through the air channel 216.The front end of the coating nozzle 4 is in cylindrical structure and surrounded by the annular opening 2141, the annular opening 2141, the air channel 216 and the auxiliary air hole 2142 are all inputted with compressed air through channel 6, and the annular air flow discharged from the annular opening 2141 with high energy absorbs the coating from the coating nozzle 4, forming a circular beam flowing along the spraying direction Z.The air flow discharged from the side air hole 2131 points to the circular beam and flows obliquely and same direction relative to the spraying direction Z;At the same time, the air flow discharged from the auxiliary air hole 2142 also points to the circular beam and flows same direction parallel to the spraying direction Z, while the circular beam is deformed into the desired diffusion beam through multiple side air holes 2131 and auxiliary air holes 2142;It is convenient to disperse air energy under the same pressure, so as to reduce the air pressure pointing to the circular beam under the premise of ensuring air volume, that is, to ensure the diffusion of coating mist and the effect of fine particles, while avoiding the rebound of coating mist sprayed on the product, and obtaining the effect of saving coating.

[0027] Further, the two angle-shaped parts 213 are in trapezoidal configuration with closed front end and gradually reduced to the front end along the spraying direction Z, and the air passage 216 is in cylindrical shape and arranged in the angle-shaped part 213. Meanwhile, the two angle-shaped parts 213 are mirror arranged with the spraying direction Z as the mirror line, each of the angle-shaped parts 213 has an inner wall surface 2132 arranged towards the side of the spraying direction Z and a front end surface 2133 arranged at the front end of the inner wall surface 2132; the side air holes 2131 are cylindrical through holes, the central axes of the three side air holes 2131 on each of the angle-shaped parts 213 are arranged in parallel to each other and extend through the inner wall surface 2132 at a specific angle relative to the spraying direction Z. And the inner wall surface 2132 is a concave surface arranged around the spraying direction Z, and the three side air holes 2131 are arranged at the bottom of the concave surface to avoid air dispersion to the two sides of the angle-shaped part. Specifically, the included angle between the central axis of the side air hole 2131 and the spraying direction Z ranges from 100° to 130°. The included angle of the three side air holes 2131 provided in the embodiment is preferably 110°, which can make the discharged air flow converge in the same direction of the spraying direction to diffuse and refine the paint aerosol.

[0028] Further, the inner wall surface 2132 has a first wall surface 21321 and a second wall surface 21322 connected in sequence from the outer edge of the flat part 212 to the front end surface 2133 along the spraying direction Z; one side air hole 2131 is arranged on the first wall surface 21321, and the remaining two side air holes 2131 are arranged on the second wall surface 21322. The first wall surface 21321 is arranged obliquely from back to front and outward relative to the spraying direction Z, and the second wall surface 21322 is arranged obliquely from the front end of the first wall surface 21321 to the front end surface 2133 and outward; in addition, the inclination angle of the first wall surface 21321 relative to the spraying direction Z is greater than the inclination angle of the second wall surface 21322 relative to the spraying direction Z, so that the three air flow channels formed on the inner wall surface 2132 sequentially increase forward along the spraying direction, so that the air flow discharged from the three side air holes 2131 and directed to the circular beam reaches a relatively balanced air volume, ensuring that the paint aerosol presents a desired diffused beam.

[0029] Further, the paint nozzle 4 extends the protruding part 214 forward along the spraying direction Z, but does not exceed the rear end of the first wall surface 21321, when the paint nozzle 4 is installed, the annular opening 2141 extends around the paint nozzle 4 and further around the protruding part 214 to avoid paint backflow to the nozzle body.

[0030] Further, the auxiliary air holes 2142 are cylindrical through holes and are configured in two groups, and the two groups of auxiliary air holes 2142 are also mirror-imaged on the inner sides of the two angle-shaped parts 213 with the jetting direction Z as a mirror image line; each group of auxiliary air holes 2142 is provided with three, and the three auxiliary air holes 2142 in each group are in equilateral triangle distribution. In addition, the hole diameter of the auxiliary air holes 2142 is smaller than the hole diameter of the side air holes 2131, and the relatively small air flow is discharged and directed to the jetting direction, so as to compensate for the relatively concentrated annular air flow discharged by the center air hole, so as to disperse the air pressure and increase the air volume to achieve the effect of paint aerosol diffusion.

[0031] In summary, the spray head provided by the utility model can disperse air energy under the same pressure by arranging three side air holes on the glue-shaped part of the air cover, and matching auxiliary air holes and center air holes, so that the air pressure directed to the paint aerosol is reduced under the premise of ensuring the air volume, the diffusion of the paint aerosol and the fine effect of particles are ensured, and the paint aerosol is prevented from rebounding when sprayed on the product, and the effect of saving paint is obtained.

[0032] In the above description, many specific details are set forth in order to provide a thorough understanding of the utility model. However, the above description is only a preferred embodiment of the utility model, and the utility model can be implemented in many other ways different from the description, so the utility model is not limited by the above disclosed specific implementation. Meanwhile, any person skilled in the art can make many possible changes and modifications to the utility model technical scheme or modify equivalent embodiments by using the disclosed methods and technical contents without departing from the scope of the utility model technical scheme. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, all still belong to the protection scope of the utility model technical scheme.

Claims

1. An anti-mist rebounding spray head, comprising a nozzle body (2) arranged at the front end of a spray gun body (1), said nozzle body (2) having a paint channel (3) which opens in the middle into a paint nozzle (4) into which a paint needle (5) is inserted, and an air cap (21) of said nozzle body (2) being screwed to said spray gun body (1) via an air nozzle ring (20), characterized in that: The air cover (21) has an annular part (211) abutting against the gun body (1), a flat part (212) connected to the annular part (211), and two angular parts (213) symmetrically arranged at both ends of the flat part (212) and extending forward along the spraying direction (Z); the middle part of the flat part (212) is provided with an annular protruding part (214), the middle part of the protruding part (214) is provided with an annular opening (2141) for the paint nozzle (4) to pass through, and the annular opening (2141) and the paint nozzle (4) form an annular central air hole (215); the protruding part (214) is further provided with an auxiliary air hole (2142) penetrating along the spraying direction (Z); each angular part (213) has three side air holes (2131) arranged in sequence along the spraying direction (Z) and communicating with the air channel (216), and each side air hole (2131) is inclined along the spraying direction (Z).

2. The anti-aerosol bounce spray head of claim 1, wherein: The two angular parts (213) are mirror-imaged along the spraying direction (Z) as a mirror line, and each angular part (213) has an inner wall surface (2132) arranged towards one side of the spraying direction (Z) and a front end surface (2133) arranged at the front end of the inner wall surface (2132). The side air hole (2131) is a cylindrical through hole, and the central axes of the three side air holes (2131) on each angular part (213) are arranged parallel to each other and extend through the inner wall surface (2132) at a certain angle relative to the spraying direction (Z).

3. The anti-aerosol bounce spray head of claim 2, wherein: The included angle between the central axis of the side air hole (2131) and the spraying direction (Z) ranges from 100° to 130°.

4. The anti-aerosol bounce spray head of claim 2, wherein: The inner wall surface (2132) is a concave surface arranged around the spraying direction (Z), and the three side air holes (2131) are arranged at the bottom of the concave surface.

5. The anti-aerosol bounce spray head of claim 4, wherein: The inner wall surface (2132) has a first wall surface (21321) and a second wall surface (21322) connected in sequence along the spraying direction (Z) from the outer edge of the flat part (212) to the front end surface (2133); One side air hole (2131) is arranged on the first wall surface (21321), and the remaining two side air holes (2131) are arranged on the second wall surface (21322).

6. The anti-aerosol bounce spray head of claim 5, wherein: The first wall surface (21321) is inclined outward from back to front relative to the spraying direction (Z), and the second wall surface (21322) is inclined outward from the front end of the first wall surface (21321) to the front end surface (2133); In addition, the inclination angle of the first wall surface (21321) relative to the spraying direction (Z) is greater than the inclination angle of the second wall surface (21322) relative to the spraying direction (Z).

7. The anti-aerosol bounce spray head of claim 6, wherein: The paint nozzle (4) extends forward beyond the protruding part (214) along the spraying direction (Z), but does not exceed the rear end of the first wall surface (21321).

8. The anti-aerosol bounce spray head of claim 1, wherein: The auxiliary air holes (2142) are cylindrical through holes and are configured in two groups, and the two groups of auxiliary air holes (2142) are also mirror-imaged on the inner sides of the two angular portions (213) with the jet direction (Z) as the mirror image line; Each group of auxiliary air holes (2142) is provided with three, and the three auxiliary air holes (2142) in each group are distributed in an equilateral triangle.

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