Nozzles and spray guns

Abstract

This application relates to the field of spray gun technology, and in particular to a nozzle and a spray gun. The nozzle includes multiple first channels and second channels, with the multiple first channels spaced apart. A fluid inlet is formed on one side of each first channel along the nozzle's axial direction. Second channels extend along the nozzle's axial direction. The ends of the multiple first channels away from the fluid inlet along the nozzle's axial direction are all connected to the second channels, and the ends of the second channels away from the first channels along the nozzle's axial direction form fluid outlets. Under conditions of high fluid pressure and high fluid flow, the multiple first channels divert the fluid to disperse the fluid pressure. Under conditions of low fluid pressure and low fluid flow, the arrangement of the first and second channels creates a longer atomization path, promoting the full atomization of low-flow, low-pressure fluid with the cooperation of the first and second channels. It is precisely this arrangement of the second channels and multiple first channels that allows the nozzle to adapt to fluids with different pressure and flow ranges while ensuring effective atomization.

Description

Technical Field

[0001] This application relates to the field of spray gun technology, and in particular to a nozzle and a spray gun. Background Technology

[0002] Spray guns are primarily used to atomize liquids and eject the resulting tiny droplets. In related technologies, spray gun nozzles mainly employ three types: multi-channel nozzles, single-channel nozzles, and flat-mouth nozzles. However, multi-channel nozzles suffer from low fluid pressure within each channel when the liquid flow rate is low, resulting in poor atomization. Single-channel nozzles have low pressure resistance and cannot handle high-pressure fluids. Flat-mouth nozzles have a larger diameter and can accommodate liquids with varying pressures and flow rates, but their atomization effect is still poor. Utility Model Content

[0003] Therefore, it is necessary to provide a nozzle and spray gun that can adapt to a wider range of pressure and flow rates, and can achieve good atomization effect under different pressure and flow ranges.

[0004] The nozzle includes a plurality of first channels and second channels. The plurality of first channels are spaced apart. A fluid inlet is formed on one side of the first channel along the nozzle axial direction. The second channel extends along the nozzle axial direction. The ends of the plurality of first channels away from the fluid inlet along the nozzle axial direction are all connected to the second channel. A fluid outlet is formed at the end of the second channel away from the first channel along the nozzle axial direction.

[0005] Understandably, by setting up multiple first channels, under conditions of high fluid pressure and large flow rate, the fluid can be diverted into multiple first channels to disperse the fluid pressure and create atomization within each first channel. After atomization, the fluid expands in volume, its pressure decreases, and it converges towards the second channel. The pressure within the first channel is higher than that within the second channel, allowing the fluid to be rapidly ejected from the second channel. Furthermore, under conditions of low fluid pressure and small flow rate, the arrangement of the first and second channels creates a longer atomization path, promoting thorough atomization of the low-flow-rate, low-pressure fluid with the cooperation of the first and second channels, ensuring effective atomization. In summary, it is precisely the arrangement of the second channel and multiple first channels that can adapt to fluids with different pressure and flow rate ranges while ensuring effective atomization.

[0006] In one embodiment, the plurality of first channels are divided into coaxial channels and non-axial channels. The coaxial channels are coaxially arranged with the second channels, and the axis of the non-axial channels is angularly arranged with the axis of the second channels. At least two of the non-axial channels are arranged at intervals along the circumference of the nozzle.

[0007] In one embodiment, the nozzle includes an assembly portion and a flow guide portion connected to the assembly portion, the flow guide portion extending circumferentially along the nozzle; Along the nozzle axis, the flow guide portion is gradually tapered from the assembly portion toward the fluid inlet. The flow guide portion forms a flow guide surface that is inclined relative to the nozzle axis. The flow guide surface is provided with a plurality of spaced-apart fluid inlets of the off-axis channels.

[0008] In one embodiment, the axis of the off-axis channel has an angle α with respect to the axis of the nozzle, where 30°≤α≤60°.

[0009] In one embodiment, the diameter of each of the first channels is not greater than the diameter of the second channel; and / or, the extension length of each of the first channels is greater than the extension length of the second channel.

[0010] In one embodiment, the extension length of each of the first channels is a, and the extension length of the second channels is b, where 0.2a ≤ b ≤ 0.4a.

[0011] In one embodiment, the second channel includes a gradually expanding section that forms the fluid outlet, the gradually expanding section being arranged gradually along the nozzle axis toward the fluid outlet.

[0012] In one embodiment, the inner wall of the expanding section is configured as an arcuate surface.

[0013] This application also includes a spray gun, which includes a gun body and the aforementioned nozzle. One end of the gun body along its own axial direction is provided with an air inlet and a liquid inlet spaced apart, and the other end is equipped with the aforementioned nozzle.

[0014] In one embodiment, the spray gun further includes a nozzle rod that is detachably connected between the nozzle and the gun body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A cross-sectional view of an embodiment of the nozzle provided in this application; Figure 2 A schematic diagram of the structure of an embodiment of the nozzle provided in this application; Figure 3A cross-sectional view of an embodiment of the spray gun provided in this application; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 A cross-sectional view of an embodiment of the nozzle rod in the spray gun provided in this application; Figure 6 A cross-sectional view of another embodiment of the nozzle rod in the spray gun provided in this application.

[0017] Reference numerals: 100, spray gun; 10, nozzle; 1001, fluid inlet; 1002, fluid outlet; 101, first channel; 1011, coaxial channel; 1012, non-coaxial channel; 102, second channel; 1021, expanding section; 11, assembly part; 12, flow guide part; 121, flow guide surface; 20, gun body; 201, air inlet; 202, liquid inlet; 21, first assembly groove; 30, nozzle rod; 31, first external thread; 32, second assembly groove; 40, nozzle sleeve; 50, fixing seat; 60, clamp structure; 70, joint structure; 80, gasket. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] It should be noted that when a component is referred to as being "fixed to," "set on," or "properly placed on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figure 1 and Figure 2 This application provides a nozzle 10, which includes a first channel 101 and a second channel 102. There are multiple first channels 101, which are spaced apart. A fluid inlet 1001 is formed on one side of the first channel 101 along the axial direction of the nozzle 10. The second channel 102 extends along the axial direction of the nozzle 10. The ends of the multiple first channels 101 that are away from the fluid inlet 1001 along the axial direction of the nozzle 10 are all connected to the second channel 102. The end of the second channel 102 that is away from the first channel 101 along the axial direction of the nozzle 10 forms a fluid outlet 1002.

[0024] Thus, the fluid flows from the first channel 101 to the second channel 102. When the fluid flow rate is high and the fluid pressure is high, the arrangement of multiple first channels 101 can divert the fluid to disperse the fluid pressure. The fluid in each first channel 101 atomizes into droplets, expands in volume, and decreases in pressure. At this time, the atomized fluid gathers in the second channel 102, making the pressure in the first channel 101 greater than that in the second channel 102. Under the pressure difference, the atomized fluid is rapidly ejected from the second channel 102. When the fluid flow rate is low and the fluid pressure is low, the arrangement of the first and second channels 101 extends the atomization path, prolonging the atomization time, promoting complete atomization, and ensuring the atomization effect. The atomized fluid can also be ejected from the second channel 102 under the pressure difference.

[0025] In summary, it is through the combined action of the second channel 102 and multiple first channels 101 that the nozzle 10 can adapt to fluids with different pressures and flow rates, enabling the nozzle 10 to achieve a good atomization effect on the fluid under different pressure and flow conditions.

[0026] like Figures 3 to 4 As shown, this application also provides a spray gun 100, which includes a nozzle 10 and a gun body 20. One end of the gun body 20 along its axial direction is provided with an air inlet 201 and a liquid inlet 202 spaced apart, and the other end is fitted with the nozzle 10. The air inlet 201 is used to introduce high-pressure, high-speed gas, and the liquid inlet 202 is used to introduce liquid. The high-pressure, high-speed gas can impact the liquid, causing the liquid to atomize at the nozzle 10, forming droplets that are then sprayed outwards. Through the aforementioned nozzle 10 configuration, the spray gun 100 can meet the atomization requirements of liquids with different pressures and flow rates without changing the pressure of the introduced gas, thus improving efficiency.

[0027] like Figure 1 and Figure 2 As shown, in an optional embodiment, the plurality of first channels 101 are divided into coaxial channels 1011 and non-axial channels 1012. The coaxial channel 1011 is coaxially arranged with the second channel 102, and the axis of the non-axial channel 1012 is angled to the axis of the second channel 102. At least two non-axial channels 1012 are arranged at intervals along the circumference of the nozzle 10. In this way, the fluid is divided into fluid near the axis of the nozzle 10 and fluid near the inner wall of the spray gun 100. The fluid near the axis of the nozzle 10 can flow directly into the coaxial channel 1011 along the axial direction of the nozzle 10, and then flow directly into the second channel 102 from the coaxial channel 1011. The fluid near the inner wall of the spray gun 100 can first be diverted into the non-axial channel 1012, and then converge into the second channel 102. This arrangement helps to promote uniform fluid distribution, thereby ensuring the atomization effect of the fluid in each first channel 101.

[0028] like Figure 1 and Figure 2 As shown, in an optional embodiment, the nozzle 10 includes an assembly portion 11, through which the nozzle 10 is mounted to the gun body 20. Further, the nozzle 10 also includes a flow-guiding portion 12 connected to the assembly portion 11, extending circumferentially along the nozzle 10. Along the axis of the nozzle 10, the flow-guiding portion 12 gradually tapers from the assembly portion 11 toward the fluid inlet 1001, forming a flow-guiding surface 121 inclined relative to the axis of the nozzle 10. The flow-guiding surface 121 has a plurality of spaced-apart, off-axis channels 1012 with fluid inlets 1001. Thus, the extension direction of the flow-guiding surface 121 is inclined relative to the axis of the nozzle 10 to guide fluid into the fluid inlets 1001 on the flow-guiding surface 121, improving the flow-diversion effect.

[0029] like Figure 1As shown, in a specific embodiment, the axis of the off-axis channel 1012 has an included angle α with the axis of the nozzle 10, 30°≤α≤60°, so that the fluid inlet 1001 of the off-axis channel 1012 is not too close to the axis of the nozzle 10 or the inner wall of the spray gun 100, thereby ensuring the fluid diversion effect and dispersing the fluid pressure. For example, α=30°, 45° or 60°.

[0030] In a specific embodiment, the aperture of each first channel 101 is no larger than the aperture of the second channel 102. This configuration ensures that the aperture of the first channel 101 is relatively small, thus guaranteeing sufficient atomization of the liquid. When the aperture of the second channel 102 is the same as that of the first channel 101, the atomization effect is enhanced, resulting in finer atomized droplets. When the aperture of the second channel 102 is larger than that of the first channel 101, a larger space is created to accommodate the fluid that expands in volume after atomization, thereby promoting the outward ejection of more atomized fluid.

[0031] In a specific embodiment, the extension length of each first channel 101 is greater than the extension length of the second channel 102. Thus, the first channel 101 can form a longer atomization path, promoting full atomization of the liquid, while the extension length of the second channel 102 is shorter, which is conducive to the rapid outward ejection of the atomized fluid.

[0032] like Figure 1 As shown, in a specific embodiment, the extension length of each first channel 101 is 'a', and the extension length of each second channel 102 is 'b', where 0.2a ≤ b ≤ 0.4a. This configuration ensures effective atomization within the first channel 101, while allowing the atomized fluid to be ejected quickly from the second channel 102. For example, b = 0.2a, 0.3a, or 0.4a.

[0033] like Figure 1 As shown, in a specific embodiment, the second channel 102 includes a gradually expanding section 1021, which forms a fluid outlet 1002. The gradually expanding section 1021 is arranged to gradually expand along the axis of the nozzle 10 towards the fluid outlet 1002, which facilitates the formation of a gradually increasing space along the fluid flow direction, thereby promoting the rapid outward ejection of more atomized, volume-expanding fluid. Since the gradually expanding section 1021 forms an inner wall inclined relative to the axis of the nozzle 10, it has a guiding effect on the fluid, accelerating the outward ejection speed. In addition, this arrangement also increases the outward ejection angle of the fluid, increasing the coverage area of ​​the nozzle 10.

[0034] like Figure 1As shown, in a specific embodiment, the inner wall of the expanding section 1021 is configured as an arc-shaped curved surface, which can disperse stress and reduce the influence of fluid pressure. In addition, it makes the inner wall of the expanding section 1021 smoother, reducing friction between the fluid and the expanding section 1021, enhancing the flow guidance effect, and reducing wear and erosion of the expanding section 1021 by the fluid, thus extending the service life of the nozzle 10. For example, the projection of the expanding section 1021 along the radial direction of the second channel 102 is parabolic; this is merely an example and not a limitation.

[0035] like Figure 3 As shown, in a specific embodiment, the spray gun 100 also includes a nozzle rod 30, which is detachably connected between the nozzle 10 and the gun body 20 to form a fluid flow. The detachable connection facilitates the replacement of different nozzle rods 30 to assemble different nozzles 10.

[0036] like Figure 3 and Figure 5 As shown, in a specific embodiment, the nozzle rod 30 is provided with a first external thread 31, and the gun body 20 is constructed with a first mounting groove 21. The nozzle rod 30 is inserted into the mounting groove and forms a threaded connection with the gun body 20, making assembly simple. Or, as Figure 6 As shown, the nozzle rod 30 is provided with a second mounting groove 32. At this time, the gun body 20 is provided with a second external thread. The gun body 20 is inserted into the second mounting groove 32 and forms a threaded connection with the nozzle rod 30.

[0037] like Figure 4 As shown, in a specific embodiment, the spray gun 100 further includes a nozzle sleeve 40, which is fitted over the nozzle 10 to protect it. The nozzle 10 can abut against the nozzle head rod 30, and is connected to the nozzle head rod 30 by the nozzle sleeve 40. The spray gun 100 also includes a gasket 80, which is pressed between the nozzle sleeve 40 and the nozzle 10.

[0038] like Figure 3 As shown, in a specific embodiment, the spray gun 100 also includes a fixing base 50, the gun body 20 passes through the fixing base 50 and is connected to the fixing base 50, and the fixing base 50 is used to fix the gun body 20 to the required equipment.

[0039] like Figure 3 As shown, in a specific embodiment, the spray gun 100 further includes a clamping structure 60, a connector structure 70, and a locking element. The clamping structure 60 is sleeved on the gun body 20 and connected to the fixing base 50 through the connector structure 70. When the locking element is removed, the gun body 20 can move relative to the clamping structure 60 along its own axial direction to adjust the extension length of the gun body 20. After adjustment, the clamping structure 60 is locked by the locking element passing through it and the gun body 20. For example, the locking element can be a screw or the like.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A nozzle characterized by, The nozzle includes: Multiple spaced-apart first channels form a fluid inlet on one side along the axial direction of the nozzle; The second channel extends axially along the nozzle. The ends of the plurality of first channels along the nozzle axis away from the fluid inlet are all connected to the second channel, and the ends of the second channels along the nozzle axis away from the first channels form the fluid outlet.

2. The nozzle of claim 1, wherein The plurality of first channels are divided into coaxial channels and non-axial channels. The coaxial channels are coaxially arranged with the second channels, and the axis of the non-axial channels is set at an angle to the axis of the second channels. At least two of the non-axial channels are arranged at intervals along the circumference of the nozzle.

3. The nozzle of claim 2, wherein, The nozzle includes an assembly portion and a flow guide portion connected to the assembly portion, the flow guide portion extending circumferentially along the nozzle; Along the nozzle axis, the flow guide portion is gradually tapered from the assembly portion toward the fluid inlet. The flow guide portion forms a flow guide surface that is inclined relative to the nozzle axis. The flow guide surface is provided with a plurality of spaced-apart fluid inlets of the off-axis channels.

4. The nozzle of claim 2, wherein, The axis of the off-axis channel and the axis of the nozzle have an included angle α, where 30°≤α≤60°.

5. The nozzle of claim 1, wherein The diameter of each of the first channels is not greater than the diameter of the second channel; and / or, the extension length of each of the first channels is greater than the extension length of the second channel.

6. The nozzle of claim 5, wherein, The extension length of each of the first channels is a, and the extension length of the second channels is b, where 0.2a ≤ b ≤ 0.4a.

7. The nozzle of any one of claims 1 to 6, wherein, The second channel includes a gradually expanding section that forms the fluid outlet, and the gradually expanding section is arranged along the nozzle axis toward the fluid outlet.

8. The nozzle of claim 7, wherein, The inner wall of the gradually expanding section is configured as an arc-shaped curved surface.

9. A spray gun characterized in that, The spray gun includes: The nozzle according to any one of claims 1 to 8; The gun body has an air inlet and a liquid inlet spaced apart at one end along its own axis, and the nozzle is installed at the other end.

10. The lance of claim 9, wherein, The spray gun also includes a nozzle rod, which is detachably connected between the nozzle and the gun body.

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