Multi-lance nozzle

Abstract

The application discloses a multi-nozzle spray head, which comprises an outer shell body as a spray head body, an air inlet channel and a paint inlet channel arranged on the outer shell body, and a plurality of installation grooves for installing nozzles and communicating with the air inlet channel and the paint inlet channel respectively, wherein an outer cover for fixing the nozzles in the installation grooves is further arranged in the installation grooves, the outer cover is provided with a spray hole, the nozzles are provided with a nozzle outlet for guiding paint in the paint inlet channel, and the nozzle outlet is concentrically arranged with the spray hole to form a structure for colliding high-speed airflow in the air inlet channel with paint in the nozzle outlet at the nozzle outlet to form an atomized jet. The spray head provided by the application avoids the problems of the prior art, such as the need for forming atomized air to realize an atomized shape, large paint consumption, high energy consumption of atomized air, high waste rate, and serious paint flying pollution in air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of atomizing spray heads, in particular to a multi-nozzle spray head for atomizing paint spraying. BACKGROUND

[0002] Paint spraying technology is applied in various fields of industry, from large ships and aircraft to industrial parts and artistic ornaments, all of which need to be painted for protection. However, with the innovation of technology and the increasing requirements, paint spraying technology is also constantly updated and iterated. In addition, the increasing requirements of industrial products for paint surfaces have made the drawbacks of traditional paint spraying technology, such as high paint consumption and paint pollution, gradually unacceptable. In the prior art, electrostatic spraying is a representative of industrial spraying technology. The principle of electrostatic spraying is to use a super-high-speed spinning cup to atomize paint, and then use high-speed airflow to converge the atomized paint, so that the atomized paint is sprayed onto a workpiece with static electricity in the required jet shape, thereby achieving the purpose of surface spraying. Electrostatic spraying is currently one of the best paint spraying technologies, as it provides a large amount of converging high-speed airflow that can achieve satisfactory atomization of the paint, thereby easily obtaining a very uniform paint surface. At the same time, since the workpiece has static electricity, the paint droplets can more easily adhere to the surface of the workpiece, greatly reducing the generation of flying paint, thereby reducing the waste rate of the paint surface, paint pollution in the air, and harm to the spraying personnel. However, despite the satisfactory spraying effect of electrostatic spraying, there are still some shortcomings, mainly as follows: 1. The single nozzle has a large oil discharge, and the high-pressure air required is also increased by several times. The high air pressure and fast air flow speed result in a decrease in the electrostatic effect, and the high-speed airflow can cause the airflow to bounce and flow randomly when spraying. 2. High gas consumption. In the electrostatic spraying process, the electrostatic effect is poor, and the paint application rate can only reach about 60% at most. If a single nozzle spray gun is used for low-flow spraying, the spraying efficiency will be low, and multiple spray guns are required for automatic spraying. This cannot be achieved with a manual spray gun. 3. The spinning cup needs to reach an ultra-high speed of tens of thousands of revolutions per minute, which results in high procurement and maintenance costs of the spinning cup. The spinning cup spraying will discolor when spraying metal-containing paint, and it is inconvenient to operate when spraying manually. Despite this, since there is no better alternative product, electrostatic spraying is still the representative of high-quality spraying technology and is widely used by people.

[0003] In order to pursue better paint surface effects, lower material consumption, smaller environmental pollution, and broader application scenarios, the present application provides a brand-new spraying nozzle. SUMMARY

[0004] The multi-nozzle spray head provided by the present application aims to solve one of the following problems:

[0005] 1. The problem of low paint application rate of atomized paint is solved; the present application can obtain different paint jet shapes by combining multiple nozzles under low air pressure atomization, which adapts to different paint spraying scenes.

[0006] 2. The multi-nozzle spray head provided by the present application has small gas consumption and low energy consumption; pure gas flow atomization is adopted, without the need for shaping gas flow, which greatly reduces the gas consumption.

[0007] 3. The use of multiple spray heads for uniform distribution can achieve uniform atomization and low-volume spraying, effectively solving the problem of large paint supply caused by single spray heads, which requires large air volume to achieve atomization and produces paint flying pollution.

[0008] 4. The multi-nozzle spray head provided by the present application has no wear parts, is structurally stable, and has a long service life.

[0009] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0010] The multi-nozzle spray head comprises an outer shell as a spray head body, an air inlet channel and a paint inlet channel are arranged on the outer shell, and a plurality of mounting grooves for mounting nozzles are arranged in communication with the air inlet channel and the paint inlet channel, respectively, an outer cover for fixing the nozzle in the mounting groove is further arranged in any mounting groove, the outer cover has a spray hole, the nozzle has a nozzle opening for guiding the paint in the paint inlet channel, and the nozzle opening and the spray hole are concentrically arranged to form a structure for colliding the high-speed airflow in the air inlet channel with the paint in the nozzle opening at the nozzle opening to form an atomized jet.

[0011] In order to better realize the flow regulation, pressure equalization and acceleration of the airflow, preferably, the nozzle has a first step, a second step and a third step arranged from top to bottom, a plurality of air holes for airflow passing through are arranged on the first step and the third step, the outer circumference of the second step and the inner wall of the outer cover form a slit for airflow acceleration passing through, and a nozzle paint channel for communicating the nozzle opening and the paint inlet channel is arranged inside. The use of the above structure makes the nozzle cooperate with the outer cover to form a special air flow channel, which can perform pressure equalization, flow regulation, flow channel acceleration and jet flow regulation on the high-pressure high-speed air, so that the high-speed airflow contacts the paint in the nozzle opening for atomized jet at the moment of leaving the nozzle, thereby finally achieving the technical effect of uniform spraying.

[0012] In order to effectively fix the nozzle through the outer cover, preferably, the inner wall of the outer cover is further provided with a first annular groove near one end of the outer shell, which is adapted to the outer circumference of the third step for limiting the relative position of the nozzle and the outer cover. The first annular groove and the third step form a nested clamping connection, and the outer cover and the outer shell are relatively fixed structures, so that the relative position between the outer shell, the nozzle and the outer cover can be effectively fixed by fixing the third step.

[0013] In order to make the air flow from the nozzle hole more uniform, and avoid the problem of uneven local flow rate, preferably, a second annular groove is arranged on the inner wall of the mounting groove near the bottom, and a space surrounded by the nozzle, the outer cover and the bottom of the mounting groove forms an equal pressure cavity with the second annular groove. The equal pressure cavity is the space with the largest size and the slowest flow rate during the air flow through the nozzle. The equal pressure cavity is arranged to utilize the air pressure characteristics to make the air from the multiple air holes reach the same pressure, and then advance along the outer wall of the nozzle after equalization, so that the flow rate is more uniform, and the problem of uneven atomization or jet is avoided.

[0014] In order to obtain better jet effect, avoid paint flying, and make the paint mix after atomization, further improve the atomization effect, preferably, the air holes arranged on the first step are inclined holes arranged in a circumferential array, and the inclination angles of any inclined hole are equal. The inclined hole tilts the high-speed airflow out. Since the inclined holes are arranged in a circumferential array, a high-speed rotational flow effect is formed around the nozzle. A local low pressure is generated at the outlet of the nozzle under the action of the high-speed airflow, and even reaches a near-vacuum state. It is because of this local low pressure that the paint can form a paint blasting effect during jetting. As another arrangement of the present application, the inclined holes can be replaced by the following design. Specifically, the air holes arranged on the first step are spiral holes arranged in a circumferential array.

[0015] In order to improve the atomization shape and improve the spraying uniformity, control the atomization cone shape formed by the high-speed airflow, preferably, the upper surface of the first step is arranged as a conical surface, and the inner top surface of the outer cover near the nozzle hole is also arranged as a conical surface matching the upper surface of the first step to form a gas guide structure for the high-speed airflow. It should be noted that the angle between the cross section of the conical surface and the horizontal line can be flexibly changed according to the actual application scene, but no matter what angle is used in the specific design, it follows the following rule: the angle between the cross section of the conical surface and the horizontal line is between 20 degrees and 80 degrees. The larger the atomization jet cone formed, the larger the coverage range and the shorter the effective jet distance. Conversely, the larger the angle between the cross section of the conical surface and the horizontal line, the smaller the atomization jet cone formed, the narrower the coverage range, and the longer the effective jet distance. Those skilled in the art can flexibly adjust and debug according to the actual paint / ink viscosity, airflow speed and workpiece spraying requirements to obtain the ideal technical effect.

[0016] Further preferably, the paint channel of the nozzle is an ink inlet hole near one end of the ink inlet channel, and the circumferential edge of the ink inlet hole is communicated with the ink inlet channel through a conical groove. The conical groove can better match the near-air channel with different hole diameters.

[0017] As a typical design of the present application, in order to improve the coverage of a single spraying, for flow / rotation spraying application scenarios, preferably, the plurality of nozzles mounted on the outer shell are arranged in a single column or multiple columns in an arc shape. As another improvement, the nozzles can be changed to a double column or multiple column arrangement, so that the spraying amount per unit time can be increased, and a greater spraying thickness can be obtained.

[0018] As a typical design of the present application, in order to increase the single-point spraying area or increase the paint spraying thickness per unit time, preferably, the plurality of nozzles mounted on the outer shell are arranged in a circular whole column.

[0019] Advantages:

[0020] 1. The present application can obtain different paint jet shapes when atomized at low air pressure through the combination of multiple nozzles, and adapt to different paint spraying scenarios.

[0021] 2. The present application adopts a multi-nozzle spray head, which can provide corresponding nozzle shapes for different application scenarios to meet the requirements of static spraying, mobile spraying, rotation spraying, and different paint thickness requirements, while meeting high-quality spraying, further expanding the application scenarios.

[0022] 3. The cyclone design used in the present application can realize atomization and jet convergence at the same time using a primary air flow, eliminating the need for a large amount of atmospheric convergent jet in existing electrostatic spraying, greatly saving the energy supply required for convergent air flow, and further reducing energy consumption.

[0023] 4. The present application can adjust the gun head connection structure according to different spray guns, and can be used in air atomizing spray guns or electrostatic spray guns, which is practical and has a wide range of applications. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is an exploded view of the three-nozzle spray head of the present application using a circular array.

[0026] Figure 2 is Figure 1 Reverse visual exploded view.

[0027] Figure 3 is an axonometric view of the nozzle structure.

[0028] Figure 4 isFigure 3 Reverse visual axonometric view.

[0029] Figure 5 is a schematic view of a single-row arc-shaped arrangement three-nozzle head.

[0030] Figure 6 is Figure 5 full sectional view along the sectioning symbol A-A.

[0031] Figure 7 is Figure 6 enlarged view of the structure of zone B.

[0032] Figure 8 is Figure 1 axonometric view in assembled condition.

[0033] Figure 9 is Figure 8 directional visual axonometric view.

[0034] Figure 10 is another structure axonometric view of a three-nozzle single-row head.

[0035] Figure 11 is Figure 10 reverse visual axonometric view.

[0036] Figure 12 is a structure axonometric view of a five-nozzle circular array head.

[0037] Figure 13 is Figure 12 reverse visual axonometric view.

[0038] Figure 14 is a front view of a five-nozzle single-row arc-shaped arrangement head.

[0039] Figure 15 is Figure 5 schematic view of the head in spraying condition.

[0040] Figure 16 is Figure 14 schematic view of the head in spraying condition.

[0041] In the figure: 1 - outer casing; 2 - air inlet channel; 3 - paint inlet channel; 4 - mounting recess; 41 - pressure equalization chamber; 5 - nozzle; 50 - spout; 51 - first step; 52 - inclined hole; 53 - second step; 54 - third step; 55 - air vent hole; 56 - paint inlet hole; 57 - conical groove; 6 - outer cap; 61 - outer thread; 62 - jet hole; 63 - air guide structure. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0044] It should be noted that similar reference numerals and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0045] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear in the description of the present application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] In addition, if the terms "horizontal", "vertical" and the like appear in the description of the present application, they do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0047] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Embodiment 1:

[0049] The embodiment provides a multi-nozzle spray head, and the structure is shown in the accompanying drawings Figures 1-4 As shown in the drawings, the multi-nozzle spray head comprises an outer shell 1 as a spray head body, an air inlet channel 2 and a paint inlet channel 3 are arranged on the outer shell 1, and a plurality of mounting grooves 4 for mounting nozzles 5 are arranged on the outer shell 1 and are communicated with the air inlet channel 2 and the paint inlet channel 3, respectively, an outer cover 6 for fixing the nozzle 5 in the mounting groove 4 is arranged in each mounting groove 4, the outer cover 6 has a spray hole 62, the nozzle 5 has a spray port 50 for guiding paint in the paint inlet channel 3, and the spray port 50 is coaxially arranged with the spray hole 62 to form a structure for colliding a high-speed airflow in the air inlet channel 2 with paint in the spray port 50 at the spray port 50 to form an atomized jet.

[0050] Working principle:

[0051] The air inlet channel 2 on the outer shell 1 is connected with a high-pressure air source, and the paint inlet channel 3 is connected with a paint or ink source that needs to be sprayed.

[0052] In actual spraying, the high-pressure air source enters the spray head through the air inlet channel 2 and is finally sprayed out from the spray hole 62, because the spray port 50 of the nozzle 5 is arranged in the middle of the spray hole 62, the airflow will sweep across the circumferential edge of the spray port 50, at this time, the end face of the spray port 50 is located in the conical region of the airflow intersection to form a local negative pressure area, the air pressure of the negative pressure area is determined by the airflow speed, when the airflow speed is greater, the air pressure of the negative pressure area is closer to vacuum, by using this aerodynamic principle, the ink in the spray port 50 can naturally flow out and contact with the high-speed airflow under the action of its own pressure, when the ink contacts with the high-speed airflow, the ink is atomized into a plurality of microparticles and continues to move forward with the airflow to form an atomized ink jet, so that the purpose of uniform spraying is achieved.

[0053] The advantages of the embodiment compared with the existing electrostatic spraying are as follows:

[0054] Firstly, the high-flow and high-flow-rate high-speed airflow is cancelled to constrain and rectify the ink atomized by the electrostatic rotary cup, so that the atomized ink jet changes the original path to form a required jet for spraying to achieve the expected effect. In the embodiment, the airflow atomization is adopted, so that the rectification is not needed, the air consumption is greatly reduced compared with the single-nozzle electrostatic spraying, the air pressure equipment for providing the high-flow airflow is saved, the energy consumption is greatly reduced, and the painting rate is increased by 30%.

[0055] Secondly, the multi-nozzle spray head can flexibly combine a plurality of nozzle spraying units to meet different spraying requirements, and has greater flexibility and adaptability compared with the existing single electrostatic spraying.

[0056] In order to make intuitive comparison, the actual verification test is also added in this embodiment, and the sample processed by this embodiment and the commercially available 30000r / min electrostatic rotary cup are used for spraying test comparison. The sprayed workpiece is the outer shell of the automobile rearview mirror. In order to ensure the fairness of the test comparison, a single air compressor is used for air supply in each group of air sources, the air compressor is turned on until the air compressor stops running, then the air compressor power is turned off, and the air pressure in the air tank of the air compressor is a constant value; At the same time, the amount of ink storage cup is added to the predetermined scale. Other preparations are the same as normal spraying and do not change. In order to verify the amount of flying paint, a paperboard with white paper is placed around the workpiece in a U shape before spraying to receive the flying paint.

[0057] Firstly, the electrostatic rotary cup spraying test is carried out, the rotary cup spraying is started, the number of sprayed workpieces is 4, and another workpiece is replaced immediately after the surface of the workpiece is sprayed. The actual spraying state of the electrostatic rotary cup is that when the electrostatic rotary cup sprays 4 workpieces, the ink jet is obviously scattered and cannot smoothly reach the workpiece, the air pressure drops sharply, and the preset 4 workpieces cannot be normally sprayed. The air source of the air compressor has lost pressure, and the compressed air is basically exhausted. The amount of ink storage cup decreases by 3 scale units, and the white paper on the paperboard has been sprayed with a large amount of ink, which is dark in color and reflects light. The ink attached to the positions on both sides of the workpiece is particularly thick.

[0058] Secondly, the three-nozzle spray head test of this embodiment is carried out, the spray head is started, the number of sprayed workpieces is 4, and another workpiece is replaced immediately after the surface of the workpiece is sprayed. The actual test state is that the three-nozzle spray head sprays 4 workpieces smoothly, the pressure of the air source of the air compressor is basically still at the preset pressure stop position and has not decreased obviously. The amount of ink storage cup decreases by about 1.2 scale units, and there is still ink on the white paper of the paperboard, but the ink is in a local radioactive dispersion state, and the white paper background color can be seen, which is not completely covered by the ink.

[0059] Finally, according to the above simple test comparison, it can be known that the ink consumption of this embodiment is saved by at least 50% compared with the existing electrostatic rotary cup spraying. Of course, the paint surface of the electrostatic spraying is relatively thicker, and the specific saving of the ink ratio cannot be accurately calculated, but from the amount of flying paint received by the white paper, it is obviously lower than that of the electrostatic spraying. In terms of air consumption, the advantage is much better than that of the electrostatic rotary cup. Due to the reduction of flying paint, the pollution of the paint spraying workshop will be further optimized, which can fully save the air consumption, save the ink consumption and reduce the environmental pollution, and is obviously better than the electrostatic spraying method.

[0060] Embodiment 2:

[0061] This embodiment is improved on the basis of embodiment 1. In this embodiment, the spray head of the three-nozzle spray head is combined with the spray head of the electrostatic rotary cup, and the spray head of the three-nozzle spray head is combined with the spray head of the electrostatic rotary cup. Figure 3 and Figure 4As shown, in order to better achieve the flow of air, pressure equalization and acceleration, in this embodiment, the nozzle 5 has a first step 51, a second step 53 and a third step 54 arranged from top to bottom, the first step 51 and the third step 54 are provided with a plurality of air holes 55 for air flow, the outer circumference of the second step 53 and the inner wall of the outer cover 6 form a slit for air flow acceleration, and the inner wall of the outer cover 6 is provided with a nozzle paint channel for communicating the nozzle 5 and the paint inlet channel 3. The structure of the above arrangement makes the nozzle 5 cooperate with the outer cover 6 to form a special air flow channel, as shown in the accompanying drawings Figures 5-7 As shown, the high-pressure high-speed air can be pressure equalized, flow accelerated and jet flow regulated, so that the high-speed airflow contacts the paint in the nozzle 5 for atomizing jet flow at the moment of leaving the nozzle 5, thereby achieving the technical effect of uniform spraying.

[0062] In order to effectively fix the nozzle 5 through the outer cover 6, the inner wall of the outer cover 6 is provided with a first annular groove near one end of the outer shell 1, which is adapted to the outer circumference of the third step 54 for limiting the relative position of the nozzle 5 and the outer cover 6. The first annular groove and the third step 54 form a nested clamping, and the outer cover 6 and the outer shell 1 are relatively fixed structures, so that the relative position of the outer shell 1, the nozzle 5 and the outer cover 6 can be effectively fixed by fixing the third step 54, as shown in the accompanying drawings Figure 7 As shown.

[0063] In order to make the flow rate of the air flow from the spray hole 62 more uniform and avoid the problem of uneven local flow rate, preferably, the inner wall of the mounting groove 4 is provided with a second annular groove near the bottom position, and the space surrounded by the nozzle 5, the outer cover 6 and the bottom of the mounting groove 4 forms a pressure equalizing cavity 41 with the second annular groove. The pressure equalizing cavity 41 is the position with the largest space and the slowest flow rate during the air flow through the nozzle 5. The pressure equalizing cavity 41 is used to make the air from the plurality of air holes 55 reach the same pressure by using the air pressure characteristics, and then advance along the outer wall of the nozzle 5 after pressure equalization, so that the flow rate is more uniform, and the problem of uneven atomization or jet flow caused by uneven flow rate is avoided.

[0064] In order to obtain better jet flow effect, avoid paint flying and make the paint mix after atomization, further improve the atomization effect, the air holes 55 on the first step 51 are inclined holes 52 arranged in a circumferential array, and the inclination angles of any inclined hole 52 are equal. The inclined hole 52 will tilt the high-speed airflow out, and since the inclined hole 52 is arranged in a circumferential array, a high-speed rotational flow effect will be formed around the nozzle 5, as shown in the accompanying drawings Figures 3-4 As shown, under the action of high-speed airflow, a local low pressure will be generated at the outlet of the nozzle 50, forming a burst atomization effect.

[0065] Embodiment 3:

[0066] As another configuration method of this application, the above-mentioned inclined hole 52 can be replaced by the following design: specifically, the ventilation hole 55 provided on the first step 51 is a spiral hole arranged in a circumferential array.

[0067] Example 4:

[0068] To reduce energy loss from high-speed airflow and control the shape of the atomized cone formed by the high-speed airflow, this embodiment is an improvement upon any of the above embodiments, as detailed in the appendix to the specification. Figure 7 As shown, the upper surface of the first step 51 is conical, and the inner top surface of the outer cover 6 near the nozzle 62 is also conical, matching the upper surface of the first step 51, forming an air guide structure 63 for high-speed airflow. It is worth noting that the angle between the conical cross-section and the horizontal line can be flexibly changed according to the actual application scenario. However, regardless of the specific design, the following rule applies: the angle between the conical cross-section and the horizontal line is between 20 and 80 degrees, resulting in a larger atomized jet cone, a wider coverage area, and a shorter effective jet distance; conversely, the larger the angle between the conical cross-section and the horizontal line, the smaller the atomized jet cone, the narrower the coverage area, and the longer the effective jet distance. Those skilled in the art can flexibly adjust and debug the design according to the viscosity of the paint / ink, the airflow speed, and the workpiece spraying requirements to obtain the desired technical effect.

[0069] More preferably, the end of the nozzle paint channel near the paint inlet channel 3 is a paint inlet hole 56, and the circumferential edge of the paint inlet hole 56 is connected to the paint inlet channel 3 through a conical groove 57. The conical groove 57 can better match paint inlet channels 3 with different apertures.

[0070] Example 5:

[0071] As a typical design of this application, in order to improve the coverage of a single spray, for flow / rotation spraying applications, based on any of the above embodiments, in this embodiment, the plurality of nozzles 5 mounted on the outer casing 1 are arranged in a single or multiple arc shape. As another improvement, the nozzles 5 can be changed to a double or multiple row arrangement, thereby increasing the spray volume per unit time and obtaining a greater spray thickness. See appendix for details. Figures 10-11 , Figures 14-16 As shown.

[0072] Example 6:

[0073] As a typical design of this application, in order to increase the single-point spraying area or increase the paint thickness per unit time, based on any of the above embodiments, in this embodiment, the plurality of nozzles 5 installed on the outer casing 1 are arranged in a circular row. See appendix for details. Figures 8-9 , Figures 12-13 As shown.

[0074] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Multi-jet nozzle comprising an outer casing (1) as nozzle body, characterized in that: The outer shell (1) is provided with an air inlet channel (2) and a paint inlet channel (3), and a plurality of installation grooves (4) for installing nozzles (5) are in communication with the air inlet channel (2) and the paint inlet channel (3) respectively, and any one of the installation grooves (4) is further provided with an outer cover (6) for fixing the nozzle (5) in the installation groove (4), the outer cover (6) has a spray hole (62), the nozzle (5) has a nozzle outlet (50) for guiding paint in the paint inlet channel (3), and the nozzle outlet (50) and the spray hole (62) are concentrically arranged to form a structure for colliding the high-speed airflow in the air inlet channel (2) with the paint in the nozzle outlet (50) at the nozzle outlet (50) to form an atomized jet; The nozzle (5) has a first step (51), a second step (53) and a third step (54) arranged from top to bottom, the first step (51) and the third step (54) are both provided with a plurality of air holes (55) for airflow, the outer circumference of the second step (53) and the inner wall of the outer cover (6) form a slit for accelerating airflow, and the nozzle (5) is provided with a nozzle paint channel for communicating the nozzle outlet (50) and the paint inlet channel (3); The inner wall of the installation groove (4) is provided with a second annular groove near the bottom position, and a space surrounded by the nozzle (5), the outer cover (6) and the bottom of the installation groove (4) forms an equalizing chamber (41) with the second annular groove.

2. The multi- mouthed showerhead of claim 1, wherein: The inner wall of the outer cover (6) is further provided with a first annular groove near one end of the outer shell (1), which is adapted to the outer circumference of the third step (54) for limiting the relative position of the nozzle (5) and the outer cover (6).

3. The multi- mouthed showerhead of claim 1, wherein: The air holes (55) arranged on the first step (51) are inclined holes (52) arranged in a circumferential array, and the inclination angles of any one of the inclined holes (52) are equal.

4. The multi- mouthed showerhead of claim 3, wherein: The air holes (55) arranged on the first step (51) are spiral holes arranged in a circumferential array.

5. The multi- mouthed showerhead of claim 1, wherein: The upper surface of the first step (51) is provided with a conical surface, and the inner top surface of the outer cover (6) near the spray hole (62) is also provided with a conical surface matched with the upper surface of the first step (51) to form a gas guide structure (63) for high-speed airflow.

6. The multi- mouthed showerhead of claim 1, wherein: The nozzle paint channel is provided with a paint inlet hole (56) near one end of the paint inlet channel (3), and the circumferential edge of the paint inlet hole (56) is in communication with the paint inlet channel (3) through a conical groove (57).

7. The multi- mouthed showerhead of claim 1, wherein: The plurality of nozzles (5) installed on the outer shell (1) are arranged in a single or multiple rows in an arc shape.

8. The multi- mouthed showerhead of claim 1, wherein: The plurality of nozzles (5) installed on the outer shell (1) are arranged in a circular whole row.

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