Two-stage atomization lacquer spraying head

Abstract

The utility model belongs to the technical field of paint spraying devices, and relates to a two-stage atomization lacquer spraying head which comprises a main conveying pipeline, an auxiliary conveying pipeline, a spraying head assembly and a lacquer storage tank, the starting ends of the main conveying pipeline and the auxiliary conveying pipeline are connected with a high-pressure air source, and the tail end of the main conveying pipeline is connected with a center pipeline of the spraying head assembly. The tail end of the auxiliary conveying pipeline is connected with a peripheral pipeline of the spray head assembly, a nozzle is formed in the tail end of the center pipeline, an annular gap opening opposite to the nozzle is formed in the tail end of the peripheral pipeline, a Venturi pipe is arranged on the main conveying pipeline, and a throat pipe of the Venturi pipe is connected with the paint storage tank. According to the two-stage atomizing Chinese lacquer spraying head provided by the utility model, thinner Chinese lacquer fog drops can be obtained, so that the spraying quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of paint spraying devices and relates to a double-stage atomizing paint spray head. Background Art

[0002] Lacquer, also known as national lacquer or raw lacquer, is a natural milky white liquid harvested from lacquer trees. Upon exposure to air, it gradually turns brown and dries to a hard film within hours. The main component of raw lacquer is urushiol, which has excellent corrosion resistance, abrasion resistance, heat resistance, and insulating properties, making it widely used.

[0003] Lacquer is typically applied by spraying. Compared to brushing, spraying offers significant advantages in terms of application efficiency, coating quality, and applicability. First, in terms of application efficiency, spraying is significantly faster than brushing. Spraying can coat large areas in a short period of time, with a single operator achieving a coating rate of 350 to 550 square meters per hour, 10 to 16 times the efficiency of brushing. This high efficiency makes spraying an ideal choice for large-scale engineering and commercial projects, significantly shortening construction schedules and reducing labor costs. Secondly, regarding coating quality, spraying creates a uniform, smooth coating, eliminating the brush marks and unevenness that can occur with brushing. The resulting sprayed coating is dense and smooth, resulting in a superior aesthetic, making it particularly suitable for applications requiring a high-quality surface finish. Furthermore, spraying allows for more precise control of coating thickness, effectively improving coating durability and adhesion. Finally, spraying excels in applicability. It can easily handle complex surfaces, including curves and uneven areas that are difficult to reach with a brush. Spraying is suitable for a variety of coating types and can meet different construction needs. Especially in situations where high decorativeness and functionality are required, the advantages of spraying are more obvious.

[0004] In view of this, there have been many attempts to spray lacquer. By fine filtering and then diluting the spray, more paint can be saved and the paint surface is more uniform and firm. Furthermore, in order to improve the spray quality and obtain a more uniform and smooth coating, it is necessary to obtain finer lacquer droplets. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a double-stage atomizing lacquer spray head, which can obtain finer lacquer mist droplets, thereby improving the spraying quality.

[0006] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0007] A two-stage atomizing lacquer spray head comprises a main delivery pipe, a secondary delivery pipe, a nozzle assembly and a paint storage tank, the starting ends of the main delivery pipe and the secondary delivery pipe are connected to a high-pressure gas source, the end of the main delivery pipe is connected to the central pipe of the nozzle assembly, the end of the secondary delivery pipe is connected to the peripheral pipe of the nozzle assembly, the end of the central pipe forms a nozzle, the end of the peripheral pipe forms an annular gap opposite to the nozzle, a Venturi tube is provided on the main delivery pipe, the throat of the Venturi tube is connected to the paint storage tank, the high-pressure gas of the main delivery pipe performs primary atomization on the lacquer in the paint storage tank when passing through the Venturi tube to form a primary atomized lacquer liquid, and the high-pressure gas of the secondary delivery pipe performs secondary atomization on the primary atomized lacquer liquid ejected from the nozzle when ejected from the annular gap to form a secondary atomized lacquer liquid.

[0008] In the above-mentioned two-stage atomizing lacquer spray head, the Venturi tube has multiple settings: it can be directly formed on the main conveying pipe, or a separate Venturi tube can be used, with its two ends connected to the main conveying pipe through connecting flanges.

[0009] In the above-mentioned two-stage atomizing lacquer spray head, the nozzle assembly includes an upper nozzle and a lower nozzle that are fixedly connected; further, the upper nozzle and the lower nozzle are fastened together by a number of fasteners such as bolts.

[0010] In the above-mentioned two-stage atomizing lacquer spray head, the lower nozzle is in a conical structure, and the peripheral pipeline includes an inlet pipeline arranged along the axial direction and a guide pipeline inclined inward from top to bottom. The inlet pipeline is arranged on the upper nozzle, and the guide pipeline is arranged on the lower nozzle, and the annular gap is connected to the guide pipeline.

[0011] In the above-mentioned two-stage atomizing lacquer spray head, a bottom ring body is provided at the bottom of the upper nozzle, and the inlet pipe and fasteners are both provided on the bottom ring body.

[0012] In the above-mentioned two-stage atomizing lacquer spray head, a nozzle core is provided in the lower nozzle, and the central pipeline axially penetrates the upper nozzle and the nozzle core; further, the nozzle is provided at the nozzle core and has a reduced diameter structure.

[0013] In the above-mentioned two-stage atomizing lacquer spray head, the upper end of the nozzle inner core is sealed to the upper nozzle through a sealing gasket, and a limiting gasket is arranged between the nozzle inner core and the lower nozzle. The inner and outer sides of the limiting gasket are respectively connected to the outer wall of the nozzle inner core and the inner wall of the lower nozzle to form a radial limiting structure.

[0014] In the above-mentioned two-stage atomizing lacquer spray head, an upper limit step is provided on the outer wall of the inner core of the nozzle, and a lower limit step is provided on the inner wall of the lower nozzle. The upper end of the limit washer conflicts with the upper limit step, and the lower end conflicts with the lower limit step to form an axial limit structure.

[0015] In the above-mentioned two-stage atomizing lacquer spray head, an inner edge ring is provided at the bottom of the lower nozzle, the upper end of the inner edge ring and the bottom of the nozzle inner core form an axial limiting structure, and the annular gap is provided on the inner edge ring and distributed radially.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides a two-stage atomizing lacquer spray head, which can achieve uniform fine-particle atomization of lacquer liquid. The utility model uses a venturi tube as the first-stage atomizer: first, the lacquer liquid is mixed with the airflow. According to the Bernoulli equation and the principle of conservation of volume, when the height remains unchanged, the flow channel suddenly narrows and the flow rate greatly increases, and the fluid obtains higher kinetic energy. The kinetic energy is converted from pressure energy. The place is in a negative pressure state, and the high-viscosity lacquer liquid in the paint storage tank is automatically sucked into the pipeline to be mixed and dispersed with the gas. The utility model uses an annular gap airflow as the second-stage atomizer: the paint liquid atomized by the first stage is sprayed out through the nozzle of the central pipeline of the nozzle assembly, and the high-speed airflow flowing out of the annular gap further tears the nozzle droplets into smaller droplets. The lacquer droplets formed by two-stage atomization can improve the spraying quality of the lacquer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 It is a cross-sectional view of the nozzle assembly of the utility model;

[0020] Figure numerals: 1. Main delivery pipeline; 2. Auxiliary delivery pipeline; 3. Nozzle assembly; 4. Paint storage tank; 5. Central pipeline; 6. Peripheral pipeline; 7. Nozzle; 8. Annular gap; 9. Venturi tube; 10. Upper nozzle; 11. Lower nozzle; 12. Inlet pipeline; 13. Diversion pipeline; 14. Nozzle core; 15. Sealing gasket; 16. Limiting gasket; 17. Upper limit step; 18. Lower limit step; 19. Inner edge ring. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-2 :

[0022] A two-stage atomizing lacquer spray head comprises a main delivery pipe, a secondary delivery pipe, a nozzle assembly and a paint storage tank, the starting ends of the main delivery pipe and the secondary delivery pipe are connected to a high-pressure gas source, the end of the main delivery pipe is connected to the central pipe of the nozzle assembly, the end of the secondary delivery pipe is connected to the peripheral pipe of the nozzle assembly, the end of the central pipe forms a nozzle, the end of the peripheral pipe forms an annular gap opposite to the nozzle, a Venturi tube is provided on the main delivery pipe, the throat of the Venturi tube is connected to the paint storage tank, the high-pressure gas of the main delivery pipe performs primary atomization on the lacquer in the paint storage tank when passing through the Venturi tube to form a primary atomized lacquer liquid, and the high-pressure gas of the secondary delivery pipe performs secondary atomization on the primary atomized lacquer liquid ejected from the nozzle when ejected from the annular gap to form a secondary atomized lacquer liquid.

[0023] Compare with Figure 1 The atomization process of this embodiment is: the main delivery pipe and the auxiliary delivery pipe are respectively connected to the high-pressure gas, and the high-pressure gas is delivered to the end along the starting end of the main delivery pipe and the auxiliary delivery pipe respectively. When the high-pressure gas in the main delivery pipe passes through the Venturi tube, it absorbs the high-viscosity paint liquid in the paint storage tank through the Venturi effect and performs the first-stage atomization on it. The first-stage atomized liquid of the lacquer continues to be transported along the main delivery pipe with the high-pressure gas, enters the central pipeline of the nozzle assembly and is ejected from the nozzle; the high-pressure gas in the auxiliary delivery pipe is transported along the auxiliary delivery pipe, enters the peripheral pipeline of the nozzle assembly and is ejected from the annular gap. The high-speed airflow ejected from the annular gap liquefies the nozzle droplets for the second stage, and further tears them into smaller droplets.

[0024] In this example, the Figure 2 The nozzle assembly includes an upper nozzle and a lower nozzle that are fixedly connected; further, the upper nozzle and the lower nozzle are fastened together by a number of fasteners such as bolts.

[0025] In this embodiment, the specific structure of the peripheral pipeline is: the lower nozzle is a conical structure, the peripheral pipeline includes an inlet pipeline arranged along the axial direction and a guide pipeline inclined inward from top to bottom, the inlet pipeline is arranged on the upper nozzle, the guide pipeline is arranged on the lower nozzle, the annular gap is connected with the guide pipeline, the inlet pipeline is connected with the auxiliary delivery pipeline, and the high-pressure gas transported by the auxiliary delivery pipeline passes through the inlet pipeline and the guide pipeline in turn and is ejected from the annular gap.

[0026] In order to further facilitate the installation of the upper nozzle and the lower nozzle and the connection of the auxiliary delivery pipeline, a bottom ring body is provided at the bottom of the upper nozzle, and the inlet pipeline and fasteners are all provided on the bottom ring body.

[0027] To facilitate the formation of the nozzle structure and enhance the spraying effect, the lower nozzle is provided with a nozzle core. The central pipeline axially penetrates the upper nozzle and the nozzle core. Furthermore, the nozzle is located in the nozzle core and has a reduced diameter structure. The nozzle core can be replaced with different models as needed to spray different specifications of paint liquid.

[0028] In order to make the inner core of the nozzle more stable, this embodiment adds a variety of sealing structures and limiting structures. Specifically: the upper end of the inner core of the nozzle is sealed with the upper nozzle through a sealing gasket, and a limiting gasket is arranged between the inner core of the nozzle and the lower nozzle. The inner and outer sides of the limiting gasket are respectively connected to the outer wall of the inner core of the nozzle and the inner wall of the lower nozzle to form a radial limiting structure.

[0029] Furthermore, an upper limit step is provided on the outer wall of the inner core of the nozzle, and a lower limit step is provided on the inner wall of the lower nozzle. The upper end of the limit washer conflicts with the upper limit step, and the lower end conflicts with the lower limit step to form an axial limit structure.

[0030] In order to better atomize the paint liquid sprayed from the nozzle by the airflow sprayed from the annular gap, an inner ring is provided at the bottom of the lower nozzle, and the upper end of the inner ring forms an axial limiting structure with the bottom of the nozzle inner core. The annular gap is provided on the inner ring and distributed radially.

[0031] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-stage atomizing lacquer spray head, characterized in that: The paint storage tank (4) comprises a main delivery pipeline (1), an auxiliary delivery pipeline (2), a nozzle assembly (3) and a paint storage tank (4), wherein the starting ends of the main delivery pipeline (1) and the auxiliary delivery pipeline (2) are connected to a high-pressure gas source, the end of the main delivery pipeline (1) is connected to a central pipeline (5) of the nozzle assembly (3), the end of the auxiliary delivery pipeline (2) is connected to a peripheral pipeline (6) of the nozzle assembly (3), the end of the central pipeline (5) forms a nozzle (7), and the end of the peripheral pipeline (6) forms a nozzle (7). ) is provided with a venturi tube (9) on the main delivery pipe (1), and the throat of the venturi tube (9) is connected to the paint storage tank (4). When the high-pressure gas of the main delivery pipe (1) passes through the venturi tube (9), the lacquer in the paint storage tank (4) is subjected to primary atomization to form a primary atomized lacquer liquid. When the high-pressure gas of the auxiliary delivery pipe (2) is ejected from the annular gap (8), the primary atomized lacquer liquid ejected from the nozzle (7) is subjected to secondary atomization to form a secondary atomized lacquer liquid.

2. The double-stage atomizing lacquer spray head according to claim 1, characterized in that: The nozzle assembly (3) comprises an upper nozzle (10) and a lower nozzle (11) which are fixedly connected.

3. The double-stage atomizing lacquer spray head according to claim 2, characterized in that: The lower nozzle (11) is in a conical structure, and the peripheral pipeline (6) includes an inlet pipeline (12) arranged along the axial direction and a guide pipeline (13) inclined inward from top to bottom. The inlet pipeline (12) is arranged on the upper nozzle (10), and the guide pipeline (13) is arranged on the lower nozzle (11). The annular gap (8) is connected to the guide pipeline (13).

4. The double-stage atomizing lacquer spray head according to claim 2, characterized in that: A nozzle inner core (14) is provided in the lower nozzle (11), and the central pipeline (5) axially penetrates the upper nozzle (10) and the nozzle inner core (14).

5. The double-stage atomizing lacquer spray head according to claim 4, characterized in that: The upper end of the nozzle inner core (14) is sealedly connected to the upper nozzle (10) via a sealing gasket (15); a limiting gasket (16) is provided between the nozzle inner core (14) and the lower nozzle (11); the inner and outer sides of the limiting gasket (16) are respectively in contact with the outer wall of the nozzle inner core (14) and the inner wall of the lower nozzle (11) to form a radial limiting structure.

6. The double-stage atomizing lacquer spray head according to claim 5, characterized in that: An upper limit step (17) is provided on the outer wall of the nozzle inner core (14), and a lower limit step (18) is provided on the inner wall of the lower nozzle (11). The upper end of the limit washer (16) contacts the upper limit step (17), and the lower end contacts the lower limit step (18) to form an axial limit structure.

7. The double-stage atomizing lacquer spray head according to claim 4, characterized in that: An inner ring (19) is provided at the bottom of the lower nozzle (11), and the upper end of the inner ring (19) and the bottom of the nozzle inner core (14) form an axial limiting structure, and the annular gap (8) is provided on the inner ring (19) and distributed radially.

Images