Anti-backflow spray head

Abstract

The utility model discloses an anti -backflow spraying head, and this spraying head aims at solving the problem that the existing spraying head does not have the wind -proof ability, and the sprayed paint mist can drift and backflow under the action of the wind force, threatening the health of the operator. The spraying head comprises a compressed air pipe and a paint pipe, the compressed air pipe has a spraying head end and an air inlet end, an inner center pipe is fixedly sleeved in the compressed air pipe, one end of the paint pipe is located in the inner center pipe, and the other end of the paint pipe extends to the outside of the compressed air pipe. During operation, compressed air enters the atomizing air duct, paint is sprayed from the conical nozzle, and the paint mist is sprayed from the spraying port after forced shear atomization. Compressed air enters the windproof air duct to form an annular airflow wind curtain, which isolates the spraying head from external interference airflow, thereby improving the wind -proof performance of the spraying head, reducing the use amount of paint, and avoiding the threat of paint mist backflow to the health of the operator.

Description

Technical Field

[0001] This utility model belongs to the field of spray head technology, specifically relating to an anti-backflow spray head. Background Technology

[0002] In various spraying operations, the spray nozzle is a key piece of equipment, and its performance directly affects the spraying effect and quality. However, most existing spray nozzles lack wind resistance. In actual spraying environments, there are often airflows of various directions and intensities, which can seriously interfere with the spraying process. When there is wind, the sprayed paint mist will be dispersed and backflowed under the action of the wind. This not only leads to paint mist waste and increases paint consumption, but the dispersed paint mist will also permeate the working environment, polluting the surrounding air and posing a threat to the health of the operators. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an anti-backflow spray nozzle. This spray nozzle aims to solve the problem that existing nozzles do not have windproof capabilities, and the sprayed paint mist will be dispersed and backflowed under the action of wind, increasing the amount of paint used and posing a threat to the health of operators.

[0005] (2) Technical solution

[0006] To solve the above-mentioned technical problems, this utility model provides an anti-backflow spray nozzle, which includes a compressed air pipe and a paint pipe. The compressed air pipe has a nozzle end and an air inlet end. An inner central pipe is fixedly fitted inside the compressed air pipe. One end of the paint pipe is located inside the inner central pipe, and the other end of the paint pipe extends to the outside of the compressed air pipe. The end of the paint pipe inside the inner central pipe is a tapered nozzle that gradually narrows, and an annular atomizing air duct is formed between the paint pipe and the inner central pipe. An annular windproof air duct is formed between the inner central pipe and the compressed air pipe. The end of the inner central pipe near the tapered nozzle narrows inward and forms a spray nozzle. The spray nozzle is larger than the diameter of the tapered nozzle. The windproof air duct includes an air duct body and a tapered air duct that communicates with the air duct body and gradually expands outward. The tapered air duct is located at the nozzle end of the compressed air pipe.

[0007] Preferably, an outer central pipe is provided inside the windproof duct, and an annular jet duct is formed between the outer central pipe and the inner central pipe.

[0008] Furthermore, the jet duct includes a first parallel section, a bent section, and a second parallel section connected in sequence. The cross-sectional area of ​​the first parallel section is smaller than that of the second parallel section. The first parallel section is located at the nozzle end of the compressed air pipe. The inner wall of the duct body near the air inlet gradually contracts inward.

[0009] Furthermore, the axial distance between the injection port and the conical nozzle port is ≤0.5mm.

[0010] Furthermore, the conical air duct and the central axis of the compressed air pipe are inclined at an angle of 28-32°.

[0011] Furthermore, the air velocity in the atomizing duct is ≥50m / s, the air velocity in the jet duct is ≥50m / s, and the outlet air velocity in the conical duct is ≥30m / s.

[0012] Furthermore, the cavity of the atomizing air duct is 12-8mm, and the cavity of the jet air duct is 20-14mm.

[0013] Furthermore, the compressed air pipe, paint pipe, inner central pipe, and outer central pipe are concentrically arranged, and the compressed air pipe, paint pipe, inner central pipe, and outer central pipe are circumferentially fixed together by multiple support rods, and the compressed air pipe, paint pipe, inner central pipe, outer central pipe, and support rods are all 3D printed from aluminum alloy.

[0014] Furthermore, one end of the outer central tube is flush with the nozzle end of the compressed air pipe, and the other end of the outer central tube retracts into the air inlet end of the compressed air pipe.

[0015] Furthermore, the nozzle of the inner central tube protrudes beyond the nozzle end of the compressed air pipe, while the other end of the inner central tube retracts into the interior of the outer central tube.

[0016] Beneficial effects

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] When this utility model spray nozzle is working, compressed air enters the atomizing air duct between the paint tube and the inner central tube. The paint in the paint tube is sprayed out from the conical nozzle. After being atomized by forced shearing, the paint mist is sprayed out from the spray nozzle. The compressed air also enters the windproof air duct to form an annular airflow curtain, which isolates the nozzle from external interfering airflow. This can establish a relatively stable airflow environment around the nozzle, thereby improving the windproof performance of the nozzle, reducing the amount of paint used, and preventing paint mist backflow from threatening the health of the operator.

[0019] This invention retracts the outer central tube into the air inlet of the compressed air pipe, and the inner central tube into the outer central tube. By simply connecting the compressed air to the air inlet of the compressed air pipe, the compressed air can automatically enter the three air ducts to work together. Installation and fixation are very convenient. At the same time, the whole is made of aluminum alloy 3D printing, which is not only easy to process, but also lightweight. The lightweight structure can reduce the weight of the spraying equipment.

[0020] This invention features an outer central tube between the inner central tube and the compressed air tube, forming an annular jet duct. During spraying, compressed air enters the jet duct. Due to the constricted shape of the jet duct, the air pressure is converted into kinetic energy through the constriction of the duct, forming a high-speed, long-range jet. When interacting with the paint mist, some of the kinetic energy is transferred to the paint mist particles, giving the paint mist more kinetic energy. This effectively accelerates and guides the paint mist, spraying it to a greater distance for better protection and further reducing the possibility of paint mist backflow. Attached Figure Description

[0021] Figure 1 This is a front view cross-sectional structural diagram of this utility model.

[0022] Figure 2 This is a front view cross-sectional structural diagram of the increased jet channel of this utility model.

[0023] Figure 3 This is a partial structural schematic diagram of the present invention.

[0024] Figure 4 This is a schematic diagram of the conical nozzle orifice of this utility model.

[0025] Figure 5 This is a cross-sectional structural diagram of the jet air duct of this utility model.

[0026] Figure 6 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 7 This is a right-view stereoscopic structural diagram of the present invention.

[0028] Figure 8 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0029] The markings in the attached diagram are as follows: 1. Compressed air pipe; 2. Paint pipe; 3. Nozzle end; 4. Air inlet end; 5. Inner central pipe; 6. Outer central pipe; 7. Conical nozzle opening; 8. Atomizing air duct; 9. Jet air duct; 10. Windproof air duct; 11. Spray nozzle; 12. Air duct body; 13. Conical air duct; 14. Support rod; 901. First parallel section; 902. Bending section; 903. Second parallel section. Detailed Implementation

[0030] This specific embodiment is an anti-backflow spray nozzle, and its structural schematic diagram is shown below. Figures 1-8 As shown, the spray nozzle includes a compressed air pipe 1 and a paint pipe 2. The compressed air pipe 1 has a nozzle end 3 and an air inlet end 4. An inner central pipe 5 is fixed inside the compressed air pipe 1. One end of the paint pipe 2 is located inside the inner central pipe 5, and the other end of the paint pipe 2 extends to the outside of the compressed air pipe 1.

[0031] The paint pipe 2 is located inside the inner central pipe 5. One end of the paint pipe 2 is a tapered nozzle 7 that gradually narrows. An annular atomizing air duct 8 is formed between the paint pipe 2 and the inner central pipe 5. An annular windproof air duct 10 is formed between the inner central pipe 5 and the compressed air pipe 1.

[0032] The inner central tube 5, near the conical nozzle opening 7, tapers inward at one end to form a spray nozzle 11. The spray nozzle 11 is larger than the diameter of the conical nozzle opening 7. Figure 3 As shown at point A, the axial distance between the spray nozzle 11 and the conical nozzle 7 is ≤0.5mm. The windproof duct 10 includes a duct body 12 and a conical duct 13 that is connected to the duct body 12 and gradually expands outward. The conical duct 13 is located at the nozzle end 3 of the compressed air pipe 1.

[0033] like Figure 1 and Figure 2 As shown: In this embodiment, an outer central pipe 6 is provided inside the windproof duct 10, and an annular jet duct 9 is formed between the outer central pipe 6 and the inner central pipe 5; the jet duct 9 includes a first parallel section 901, a bent section 902 and a second parallel section 903 connected in sequence. The cross-sectional area of ​​the first parallel section 901 is smaller than that of the second parallel section 903. The first parallel section 901 is located at the nozzle end 3 of the compressed air pipe 1. The inner wall of the duct body 12 near the air inlet end 4 gradually contracts inward; because the shape of the jet duct 9 is designed to be contracted, that is, from the air inlet... As the cross-sectional area from the inlet to the outlet gradually decreases, the air velocity gradually increases. During this process, the air pressure can be converted into kinetic energy through the contraction of the air duct, forming a high-speed long-range jet. Since the high-speed jet air has a large momentum, when the high-speed jet air interacts with the paint mist, some of the kinetic energy is transferred to the paint mist particles, giving the paint mist more kinetic energy and effectively overcoming air resistance, thereby increasing the range of the paint mist. Thus, through the synergistic effect of the three air ducts, the fog droplets are prevented from being carried back by the airflow and causing pollution.

[0034] like Figure 2 As shown: In this embodiment, the angle between the conical air duct 13 and the central axis of the compressed air pipe 1 is 28-32°; Figure 5As shown at point B, the preferred inclination angle is 30°. This allows the conical air duct 13 to change the direction of the airflow, causing the airflow of the air curtain to spray out around the nozzle at a certain angle, thereby achieving a better protective effect and further reducing the possibility of paint mist backflow.

[0035] In this embodiment, the paint pipe 2 is Φ2mm, the air velocity of the atomizing air duct 8 is ≥50m / s, the air velocity of the jet air duct 9 is ≥50m / s, and the outlet air velocity of the conical air duct 13 is ≥30m / s; the cavity of the atomizing air duct 8 is 12-8mm, and the cavity of the jet air duct 9 is 20-14mm.

[0036] like Figure 6-8 As shown: In this embodiment, the compressed air pipe 1, paint pipe 2, inner central pipe 5, and outer central pipe 6 are arranged concentrically. The compressed air pipe 1, paint pipe 2, inner central pipe 5, and outer central pipe 6 are circumferentially fixed together by multiple support rods 14. The compressed air pipe 1, paint pipe 2, inner central pipe 5, outer central pipe 6, and support rods 14 are all 3D printed from aluminum alloy. 3D printing of aluminum alloy is not only convenient to process, but also lightweight. The lightweight structure can reduce the weight of the spraying equipment.

[0037] like Figure 2 and Figure 4 As shown: In this embodiment, one end of the outer central tube 6 is flush with the nozzle end 3 of the compressed air pipe 1, and the other end of the outer central tube 6 is retracted into the air inlet end 4 of the compressed air pipe 1; the spray port 11 of the inner central tube 5 protrudes from the nozzle end 3 of the compressed air pipe 1, and the other end of the inner central tube 5 is retracted into the interior of the outer central tube 6; in this way, after the air inlet end 4 of the compressed air pipe 1 is connected to the compressed air, the compressed air can enter the atomization air duct 8, the jet air duct 9 and the windproof air duct 10, and the spray port 11 protrudes from the nozzle end 3 of the compressed air pipe 1, without affecting the atomization and spraying of the paint.

[0038] Working Principle: During use, the air inlet 4 of compressed air pipe 1 is connected to compressed air, and the paint pipe 2 is connected to paint. When the spray nozzle is working, compressed air enters the atomizing air duct 8 between the paint pipe 2 and the inner central pipe 5. The paint in the paint pipe 2 is sprayed out from the conical nozzle 7, and after forced shearing atomization, the paint mist is sprayed out from the spray nozzle 11. At the same time, compressed air enters the jet air duct 9. Because the shape of the jet air duct 9 is designed to be constricted, that is, the cross-sectional area gradually decreases from the inlet to the outlet, the air velocity gradually increases as the cross-sectional area of ​​the jet air duct 9 decreases. In this process, the air pressure energy is converted into kinetic energy through the contraction of the air duct, forming a high-speed jet. Because the high-speed jet of air has a large momentum, when the high-speed jet of air interacts with the paint mist, part of the... The kinetic energy is then transferred to the paint mist particles, giving the paint mist more kinetic energy and effectively overcoming air resistance, thereby increasing the range of the paint mist. This allows for effective acceleration and guidance of the paint mist, enabling it to be sprayed to a greater distance, significantly increasing the nozzle's range and meeting the needs of different operating scenarios. At the same time, compressed air enters the windproof duct 10, guiding the airflow out in a specific direction and speed, forming a continuous annular airflow curtain with a certain speed and thickness around the nozzle. This isolates the nozzle from external interfering airflow, establishing a relatively stable airflow environment around the nozzle, effectively preventing external airflow from interfering with the paint mist, blocking backflow of paint mist, thereby improving the nozzle's windproof performance, reducing paint consumption, and preventing paint mist backflow from threatening the operator's health.

[0039] All technical features in this embodiment can be freely combined according to actual needs.

[0040] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An anti-backflow spray nozzle, comprising a compressed air pipe (1) and a paint pipe (2), characterized in that: The compressed air pipe (1) has a nozzle end (3) and an air inlet end (4). An inner central pipe (5) is fixed inside the compressed air pipe (1). One end of the paint pipe (2) is located inside the inner central pipe (5), and the other end of the paint pipe (2) extends to the outside of the compressed air pipe (1). The paint tube (2) has a tapered nozzle (7) that gradually narrows inside the inner central tube (5) at one end, and an annular atomizing air duct (8) is formed between the paint tube (2) and the inner central tube (5), and an annular windproof air duct (10) is formed between the inner central tube (5) and the compressed air tube (1). The inner central tube (5) has an arc that narrows inward at one end near the conical nozzle (7) to form a spray port (11). The spray port (11) is larger than the diameter of the conical nozzle (7). The windproof duct (10) includes a duct body (12) and a conical duct (13) that is connected to the duct body (12) and gradually expands outward. The conical duct (13) is located at the nozzle end (3) of the compressed air pipe (1).

2. The anti-backflow spray nozzle according to claim 1, characterized in that, The windproof duct (10) is provided with an outer central pipe (6), and an annular jet duct (9) is formed between the outer central pipe (6) and the inner central pipe (5).

3. The anti-backflow spray nozzle according to claim 2, characterized in that, The jet duct (9) includes a first parallel section (901), a bend section (902), and a second parallel section (903) connected in sequence. The first parallel section (901) has a smaller cross-sectional area than the second parallel section (903). The first parallel section (901) is located at the nozzle end (3) of the compressed air pipe (1). The inner wall of the duct body (12) near the air inlet end (4) gradually contracts inward.

4. The anti-backflow spray nozzle according to claim 3, characterized in that, The axial distance between the injection port (11) and the conical nozzle port (7) is ≤0.5mm.

5. The anti-backflow spray nozzle according to claim 4, characterized in that, The conical air duct (13) and the central axis of the compressed air pipe (1) are inclined at an angle of 28-32°.

6. The anti-backflow spray nozzle according to claim 5, characterized in that, The air velocity of the atomizing duct (8) is ≥50m / s, the air velocity of the jet duct (9) is ≥50m / s, and the outlet air velocity of the conical duct (13) is ≥30m / s.

7. The anti-backflow spray nozzle according to claim 6, characterized in that, The cavity of the atomizing air duct (8) is 12-8 mm, and the cavity of the jet air duct (9) is 20-14 mm.

8. The anti-backflow spray nozzle according to claim 7, characterized in that, The compressed air pipe (1), paint pipe (2), inner central pipe (5) and outer central pipe (6) are arranged concentrically. The compressed air pipe (1), paint pipe (2), inner central pipe (5) and outer central pipe (6) are circumferentially fixed by multiple support rods (14). The compressed air pipe (1), paint pipe (2), inner central pipe (5), outer central pipe (6) and support rods (14) are all 3D printed from aluminum alloy.

9. The anti-backflow spray nozzle according to claim 8, characterized in that, One end of the outer central tube (6) is flush with the nozzle end (3) of the compressed air pipe (1), and the other end of the outer central tube (6) is retracted into the air inlet end (4) of the compressed air pipe (1).

10. The anti-backflow spray nozzle according to claim 9, characterized in that, The nozzle (3) of the compressed air pipe (1) protrudes from the spray port (11) of the inner central tube (5), and the other end of the inner central tube (5) retracts into the interior of the outer central tube (6).

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