A spray gun capable of multi-stage atomization

Abstract

This utility model relates to a spray gun capable of multi-stage atomization, belonging to the technical field of multi-stage atomization spray guns. The multi-stage atomization spray gun includes: a spray pipe with a nozzle threadedly connected to its inner wall; and an anti-backflow mechanism, comprising two sealing gaskets slidably connected to the inner wall of the nozzle, and two mounting blocks fixedly connected to the inner wall of the nozzle, with the surface of the sealing gaskets slidably connected to the inner wall of the mounting blocks. Through the cooperation of springs, sealing gaskets, and mounting blocks, unidirectional limiting of the air holes within the nozzle is achieved, thereby preventing the solution inside the nozzle cavity from flowing into the air holes, ensuring the air intake of the nozzle cavity, and thus guaranteeing the atomization effect. The cooperation of a first sealing ring and a second sealing ring seals the connection between the nozzle and the spray pipe, preventing leakage at the connection and improving the atomization effect of the spray gun.

Description

Technical Field

[0001] This utility model relates to the field of multi-stage atomization spray gun technology, and in particular to a spray gun capable of multi-stage atomization. Background Technology

[0002] Selective catalytic reduction (SCR) denitrification technology is widely used in coal-fired boilers. This technology uses ammonia as a reducing agent. Due to safety concerns, online urea pyrolysis for ammonia production is widely used in SCR denitrification systems. In SCR denitrification systems, uniform ammonia distribution is crucial for improving denitrification efficiency. Therefore, multi-stage atomization spray guns can refine liquids such as urea solutions and ammonia water through different stages or methods, forming finer and more uniform droplets.

[0003] A search revealed that the Chinese patent "Multi-stage Atomizing Nozzle and Multi-stage Atomizing Device" (authorization announcement number CN207667856U) utilizes a multi-stage atomizing nozzle, nozzle body, guide component, impact reflector, and air cap in a coordinated manner to maintain good atomization even at high solution flow rates. The air vents surround the liquid inlet, allowing air to pass into the nozzle body, thus enabling more airflow to cut the solution within the nozzle body. This reduces the number of nozzles required; in other words, this multi-stage atomizing nozzle can replace multiple low-flow-rate solution nozzles while achieving the same excellent spray effect.

[0004] In the aforementioned application, because the vent is located around the liquid inlet, the solution flowing inside the nozzle body can easily flow into the vent, thereby affecting the amount of air that can be introduced into the nozzle body and thus affecting the spraying effect. Utility Model Content

[0005] Therefore, it is necessary to provide a spray gun capable of multi-stage atomization to address the problem that the solution flowing inside the nozzle body easily flows into the pores.

[0006] The device includes: a nozzle with a nozzle threadedly connected to its inner wall; and an anti-backflow mechanism comprising two sealing gaskets slidably connected to the inner wall of the nozzle, two mounting blocks fixedly connected to the inner wall of the nozzle, the surfaces of the sealing gaskets slidably connected to the inner walls of the mounting blocks, and springs fixedly connected to the opposite ends of the sealing gaskets and mounting blocks. Through the cooperation of the springs, sealing gaskets, and mounting blocks, unidirectional limiting of the air holes within the nozzle is achieved, thereby preventing the solution inside the nozzle cavity from flowing into the air holes, ensuring the air intake of the nozzle cavity, and thus guaranteeing the atomization effect.

[0007] In one embodiment, a first sealing ring is fixedly connected to one end of the nozzle, and a second sealing ring is fixedly connected to the inner wall of the nozzle. The surface of the first sealing ring is engaged with the inner wall of the nozzle, and the inner surface of the second sealing ring contacts the surface of the nozzle. The first and second sealing rings cooperate to seal the connection between the nozzle and the nozzle, preventing leakage and thus improving the atomization effect of the spray gun.

[0008] In one embodiment, a waterproof sleeve is fixedly connected to the opposite end of the sealing gasket and the mounting block, and the surface of the spring is located inside the waterproof sleeve. The waterproof sleeve protects the spring surface, thereby preventing the spring from being immersed in a solution.

[0009] In one embodiment, a cover is fixedly connected to the surface of the nozzle, and the inner wall of the cover is snapped onto the surface of the nozzle.

[0010] In one embodiment, a first magnetic ring is fixedly connected to the inner wall of the cover.

[0011] In one embodiment, a second magnetic ring is fixedly connected to the inner wall of the nozzle, and the first magnetic ring and the second magnetic ring are attracted to each other by opposite poles.

[0012] In one embodiment, a shielding rod is slidably connected to the inner wall of the cover, and the surface of the shielding rod is engaged with the inner wall of the nozzle. Through the cooperation of the cover, the shielding rod, the first magnetic ring, and the second magnetic ring, the nozzle is stably threadedly installed inside the nozzle, ensuring a stable connection between the nozzle and the nozzle, thereby ensuring the atomization effect.

[0013] In one embodiment, two limiting blocks are fixedly connected to the surface of the shielding rod, and the surfaces of the limiting blocks are slidably connected to the nozzle and the inner wall of the shielding rod in sequence. The limiting blocks restrict the upward movement range of the shielding rod, avoiding the risk of the shielding rod being lost.

[0014] Beneficial effects 1. By cooperating with the spring, sealing gasket and mounting block, the air hole inside the nozzle is unidirectionally limited, thereby preventing the solution inside the nozzle cavity from flowing into the air hole inside the nozzle, thus ensuring the air intake of the nozzle cavity and thus ensuring the atomization effect. 2. The first and second sealing rings work together to seal the connection between the nozzle and the spray pipe, preventing leakage and improving the atomization effect of the spray gun. Attached Figure Description

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

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the nozzle and spray head of this utility model; Figure 3 This utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This utility model Figure 2 Enlarged view of point B in the middle.

[0017] Figure label: 100. Nozzle; 200. Nozzle head; 300. Anti-backflow mechanism; 301. Sealing gasket; 302. Mounting block; 303. Spring; 304. Waterproof sleeve; 305. Second sealing ring; 306. First sealing ring; 307. Cover; 308. First magnetic ring; 309. Second magnetic ring; 310. Cover rod; 311. Limiting block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set 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 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly 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," "on top of," and "over" 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 specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0023] The following is combined Figures 1-4 This invention describes a spray gun capable of multi-stage atomization.

[0024] In one embodiment, a spray gun capable of multi-stage atomization includes: a spray pipe 100, with a nozzle 200 threadedly connected to the inner wall of the spray pipe 100; an anti-backflow mechanism 300, which includes two sealing gaskets 301 slidably connected to the inner wall of the nozzle 200, two mounting blocks 302 fixedly connected to the inner wall of the nozzle 200, the surface of the sealing gaskets 301 slidably connected to the inner wall of the mounting blocks 302, and a spring 303 fixedly connected to the opposite ends of the sealing gaskets 301 and the mounting blocks 302.

[0025] In this embodiment, when using an atomizing spray gun to atomize urea solution in the SCR denitrification system of a coal-fired boiler, the appropriate type of atomizing spray gun, such as an airflow atomizing spray gun, is selected based on factors such as the size, shape, flue gas flow rate, and temperature distribution of the coal-fired boiler. It is necessary to ensure that the spray gun is evenly distributed on the flue cross-section so that the urea solution can be evenly sprayed into the flue gas and fully mixed with the flue gas. According to the boiler's operating conditions and denitrification requirements, urea and water are mixed in a certain proportion to form a urea solution of appropriate concentration, generally between 30% and 50%. The solution is filtered before entering the spray gun. The air compressor and solution delivery pump are turned on so that the air and solution reach the set pressure and flow rate, respectively.

[0026] Depending on the type of spray gun and the denitrification requirements, adjust the air pressure and flow rate. Airflow atomizing spray guns require higher air pressure and flow rate to achieve good atomization effect. Generally, the air pressure is between 0.3-0.8 MPa, and the flow rate is matched according to the specifications of the spray gun and the solution flow rate.

[0027] Adjust the pressure and flow rate of the solution delivery pump to control the amount of urea solution injected. The solution pressure must match the air pressure to ensure atomization effect and injection angle.

[0028] By utilizing the interaction between high-speed airflow and urea solution, the solution is broken into small droplets. Inside the spray gun, the airflow and solution pass through different channels and meet at the spray gun outlet. The high-speed airflow generates strong shearing and frictional forces on the solution, tearing it into small particles. The atomized solution flows into the inner cavity of the nozzle 200.

[0029] Part of the high-speed airflow inside the nozzle 100 pushes the sealing gasket 301 away from the air hole through the air hole in the nozzle 200, causing the sealing gasket 301 to compress the spring 303, thereby allowing the high-speed airflow to flow into the inner cavity. When there is no high-speed airflow in the air hole, the elastic force of the spring 303 pushes the sealing gasket 301 to slide into the air hole to block it, preventing the solution in the inner cavity of the nozzle 200 from flowing back into the nozzle 100 through the air hole. The airflow generates strong shearing and frictional forces on the solution, tearing the solution into tiny particles for secondary atomization. The mixture of droplets and air is sprayed out through the nozzle 200, which can maintain a good atomization effect even when the solution flow rate is large. This reduces the number of nozzles required, meaning that the nozzle 200 can replace multiple small-flow solution nozzles to achieve the same good spraying effect.

[0030] like Figure 3As shown, a first sealing ring 306 is fixedly connected to one end of the nozzle 200, and a second sealing ring 305 is fixedly connected to the inner wall of the nozzle 200. The surface of the first sealing ring 306 is snapped onto the inner wall of the nozzle 100, and the inner surface of the second sealing ring 305 contacts the surface of the nozzle 100. A waterproof sleeve 304 is fixedly connected to the opposite end of the sealing gasket 301 and the mounting block 302, and the surface of the spring 303 is located inside the waterproof sleeve 304.

[0031] like Figure 4 As shown, a cover 307 is fixedly connected to the surface of the nozzle 200. The inner wall of the cover 307 is snapped onto the surface of the nozzle 100. A first magnetic ring 308 is fixedly connected to the inner wall of the cover 307. A second magnetic ring 309 is fixedly connected to the inner wall of the nozzle 100. The first magnetic ring 308 and the second magnetic ring 309 are attracted by opposite poles. A cover rod 310 is slidably connected to the inner wall of the cover 307. The surface of the cover rod 310 is snapped onto the inner wall of the nozzle 100. Two limiting blocks 311 are fixedly connected to the surface of the cover rod 310. The surfaces of the limiting blocks 311 are slidably connected to the nozzle 100 and the inner wall of the cover 307 in sequence.

[0032] Spring 303, mounting block 302 and cover 307 are all 304 stainless steel components, which have good high temperature resistance and corrosion resistance.

[0033] Both the first magnetic coil 308 and the second magnetic coil 309 are AlNiCo magnet components, which have good high-temperature resistance.

[0034] The sealing gasket 301, waterproof sleeve 304, first sealing ring 306, second sealing ring 305, cover rod 310 and limit block 311 are all perfluororubber components, which have good elasticity, corrosion resistance and high temperature resistance.

[0035] In this embodiment, the nozzle 200 is threadedly installed inside the nozzle 100, so that the surface of the first sealing ring 306 is engaged inside the nozzle 100, the surface of the nozzle 100 slides into the second sealing ring 305, so that the cover 307 slides into the surface of the nozzle 100, the first magnetic ring 308 is magnetically attracted to one end of the second magnetic ring 309, pushing the cover rod 310 down to engage inside the nozzle 100, so that the nozzle 200 is stably installed inside the nozzle 100.

[0036] Working principle: Part of the high-speed airflow in the nozzle 100 pushes the sealing gasket 301 away from the air hole in the nozzle 200 through the air hole, causing the sealing gasket 301 to squeeze the spring 303, thereby allowing the high-speed airflow to flow into the inner cavity. When there is no high-speed airflow in the air hole, the elastic force of the spring 303 pushes the sealing gasket 301 to slide into the air hole to block it, preventing the solution in the inner cavity of the nozzle 200 from flowing back into the nozzle 100 through the air hole.

[0037] It should be noted that the nozzle 100, nozzle 200, sealing gasket 301, mounting block 302, first magnetic ring 308 and second magnetic ring 309 mentioned above are all devices with relatively mature existing technology. The specific models can be selected according to actual needs, and will not be elaborated here.

[0038] 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.

[0039] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A spray gun capable of multi-stage atomization, characterized in that, include: The nozzle (100) has a nozzle (200) threadedly connected to its inner wall. An anti-backflow mechanism (300) includes two sealing gaskets (301) slidably connected to the inner wall of the nozzle (200), two mounting blocks (302) fixedly connected to the inner wall of the nozzle (200), the surface of the sealing gasket (301) slidably connected to the inner wall of the mounting block (302), and a spring (303) fixedly connected to the opposite end of the sealing gasket (301) and the mounting block (302).

2. The spray gun capable of multi-stage atomization according to claim 1, characterized in that, One end of the nozzle (200) is fixedly connected to a first sealing ring (306), and the inner wall of the nozzle (200) is fixedly connected to a second sealing ring (305). The surface of the first sealing ring (306) is snapped into the inner wall of the nozzle (100), and the inner surface of the second sealing ring (305) is in contact with the surface of the nozzle (100).

3. The spray gun capable of multi-stage atomization according to claim 1, characterized in that, The sealing gasket (301) and the mounting block (302) are fixedly connected to a waterproof sleeve (304), and the surface of the spring (303) is located inside the waterproof sleeve (304).

4. The spray gun capable of multi-stage atomization according to claim 1, characterized in that, A cover (307) is fixedly connected to the surface of the nozzle (200), and the inner wall of the cover (307) is snapped onto the surface of the nozzle (100).

5. The spray gun capable of multi-stage atomization according to claim 4, characterized in that, The inner wall of the cover (307) is fixedly connected to a first magnetic ring (308).

6. The spray gun capable of multi-stage atomization according to claim 5, characterized in that, The inner wall of the nozzle (100) is fixedly connected to a second magnetic ring (309), and the first magnetic ring (308) and the second magnetic ring (309) are attracted to each other by opposite poles.

7. The spray gun capable of multi-stage atomization according to claim 4, characterized in that, The inner wall of the cover (307) is slidably connected to a cover rod (310), and the surface of the cover rod (310) is engaged with the inner wall of the nozzle (100).

8. The spray gun capable of multi-stage atomization according to claim 7, characterized in that, The surface of the shield (310) is fixedly connected to two limiting blocks (311), and the surface of the limiting blocks (311) is slidably connected to the inner wall of the nozzle (100) and the cover (307) in sequence.

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