A filter structure within a nozzle

Abstract

The application provides a nozzle inner filtering structure, relates to the technical field of nozzles, and comprises an input filtering unit, a first conveying filtering unit, a back pressure conveying unit and a second conveying filtering unit, wherein the first waterway filtering piece and the second waterway filtering piece of the input filtering unit realize twice filtering of external water, the first airway filtering piece of the input filtering unit and the second airway filtering piece of the first conveying filtering unit realize twice filtering of external gas, the nozzle is prevented from being blocked in the use process through the filtering of impurities, the efficiency of secondary cooling is ensured, and therefore the quality of continuous casting billets is improved.

Description

Technical Field

[0001] This application relates to the field of nozzle technology, and more particularly to an internal filter structure for a nozzle. Background Technology

[0002] In the production of continuously cast billets on slab continuous casting machines, secondary cooling of the billets is typically achieved using nozzles. The effectiveness of this secondary cooling plays a crucial role in the quality of the billets. During secondary cooling, the nozzles spray water or a water-air mixture to cool the billets, ensuring rapid and uniform solidification of the billet with a liquid core and preventing cracking. Currently, most nozzles used in domestic slab continuous casting machines are simple, internally mixed, long-bodied air-water atomizing nozzles. External cooling water enters the nozzle cavity directly through a spray manifold, is atomized, and then sprayed out. However, in actual use, deposits detached from the spray manifold wall and large suspended particles can easily clog the nozzles. This not only reduces the efficiency of secondary cooling but also further affects the quality of the continuously cast billets.

[0003] Therefore, a filtration structure is urgently needed to solve the problem of nozzle clogging in slab continuous casting machines. Utility Model Content

[0004] The purpose of this application is to provide an internal filter structure for the nozzle to address the above-mentioned problems and solve the clogging problem of the nozzle in a slab continuous casting machine.

[0005] This application provides an in-nozzle filter structure, including: An input filtering unit is provided with a first space and a second space that are not interconnected, a first water filter connected to the first space, a first air filter connected to the second space, and a second water filter connected to the first space and passing through the first space and the second space in sequence. The first conveying and filtering unit has a second water filter element extending from the second space through the first conveying and filtering unit to the outside of the first conveying and filtering unit. The first conveying and filtering unit has a third space inside and a second air filter element communicating with the second space and the third space. Water is filtered once by the first water path filter from the outside, then enters the first space and undergoes a second filtration by the second water path filter; air is filtered once by the first air path filter from the outside, then enters the second space and undergoes a second filtration by the second air path filter before being output to the third space.

[0006] According to the technical solutions provided in certain embodiments of this application, the filtration structure further includes a back pressure conveying unit. The back pressure conveying unit is disposed on the side of the first conveying filtration unit away from the input filtration unit. The back pressure conveying unit has a fourth space communicating with the third space and a back pressure member communicating with the second water filter element, so that the gas is input from the third space to the fourth space, and the water filtered by the second water filter element is input into the back pressure member to maintain a stable pressure.

[0007] According to the technical solutions provided in certain embodiments of this application, the filtration structure further includes a second conveying and filtering unit. The second conveying and filtering unit is disposed on the side of the back pressure conveying unit away from the first conveying and filtering unit. The second conveying and filtering unit has a fifth space and a sixth space that are not interconnected. The fifth space is connected to the back pressure member, and the sixth space is connected to the fourth space. A third water path filter is located inside the fifth space, which is used to allow gas in the fourth space to enter the sixth space and to allow water in the back pressure member to enter the fifth space and be filtered by the third water path filter.

[0008] According to the technical solutions provided in certain embodiments of this application, the input filtration unit includes a nozzle body, and the nozzle body has a radially extending partition, which divides the interior of the nozzle body into a first space and a second space that are not interconnected; the output end of the first water filter is connected to the first space, the output end of the first air filter is connected to the second space, and both the first water filter and the first air filter have multiple filter holes for connecting to an external water source and an external air source, respectively.

[0009] According to the technical solutions provided in certain embodiments of this application, the nozzle body is a hollow shell with openings at both ends along the axial direction and an internal cavity. Two through holes communicating with the internal cavity are provided on one radial side. A grid seat is installed on each of the two through holes. The first water filter and the first air filter are respectively installed on the two grid seats. The first water filter and the first air filter are both vertical tubes with a semi-circular top and an open bottom. A first connector and a second connector are respectively installed at the bottom openings of the first water filter and the first air filter for connecting to the two grid seats respectively.

[0010] According to the technical solutions provided in certain embodiments of this application, the second water filter element sequentially passes through the first space, the partition, and the second space, and the second water filter element is sealed to the partition and the second space. A filter hole is provided on the input end of the second water filter element for communicating with the first space. The output end of the second water filter element passes through the first conveying and filtering unit and extends to the back pressure conveying unit, communicating with the input end of the back pressure element.

[0011] According to the technical solutions provided in certain embodiments of this application, the second water filter includes an input pipe, a water-blocking core, and an output pipe connected in sequence. The outer wall of the input pipe is provided with a plurality of filter holes for communicating with the first space, and the filter holes are spirally distributed on the outer wall of the input pipe. The water-blocking core is connected to the input pipe and the output pipe respectively, and is disposed at the connection between the second water filter and the partition.

[0012] According to the technical solutions provided in certain embodiments of this application, the first delivery and filtration unit includes a first outer tube, a second air path filter is disposed inside the first outer tube, the third space is formed between the first outer tube and the second air path filter, the input end of the second air path filter is connected to the second space, and the outer wall of the second air path filter is provided with filter holes so that the gas in the second space enters the third space after being filtered by the second air path filter.

[0013] According to the technical solutions provided in certain embodiments of this application, the back pressure conveying unit includes an adjusting outer tube, and the back pressure component is disposed inside the adjusting outer tube. The adjusting outer tube and the back pressure component form the fourth space. One end of the adjusting outer tube is connected to the first conveying and filtering unit, and the other end is connected to the second conveying and filtering unit, so that the third space, the fourth space, and the sixth space are connected in sequence. The output end of the back pressure component is connected to the fifth space of the second conveying and filtering unit.

[0014] According to the technical solutions provided in certain embodiments of this application, the second conveying and filtering unit includes a second outer pipe and a first inner pipe disposed inside the second outer pipe. The third water path filter is disposed inside the first inner pipe. A fifth space is formed between the first inner pipe and the third water path filter. A sixth space is formed between the second outer pipe and the first inner pipe. The third water path filter has a plurality of filter holes so that water entering the fifth space is filtered by the third water path filter.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This application forms a water channel through a first water channel filter, a first space, and a second water channel filter in the nozzle internal filtration structure; and forms an air channel through a first air channel filter, a second space, a second air channel filter, and a third space in the nozzle internal filtration structure. External water undergoes two filtrations in the water channel by passing through the first and second water channel filters, and external air undergoes two filtrations in the air channel by passing through the first and second air channel filters, thus achieving the filtration of impurities, preventing nozzle blockage during use, ensuring the efficiency of secondary cooling, and thereby improving the quality of the continuously cast billet.

[0016] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an internal filter structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of the water flow direction in an in-nozzle filter structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the gas flow direction of an in-nozzle filter structure provided in an embodiment of this application; Figure 4 A schematic diagram of the structure of the first water filter element provided in the embodiments of this application. Figure 5 A schematic diagram of the structure of the first air path filter element is provided for the embodiments of this application; Figure 6This is a schematic diagram of the structure of the input pipe of the second water filter element provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the water-retaining core provided in the embodiments of this application; Figure 8 This is a schematic diagram of the nozzle body provided in an embodiment of this application; Figure 9 A schematic diagram of the structure of the partition provided in the embodiments of this application; Figure 10 This is a schematic diagram of the structure of the second air path filter element provided in the embodiments of this application; Figure 11 This is a schematic diagram of the back pressure component provided in the embodiments of this application; Figure 12 This is a schematic diagram of the structure of the adjusting outer tube provided in an embodiment of this application; Figure 13 This is a schematic diagram of the structure of the third water channel filter provided in the embodiments of this application.

[0019] The text labels in the image represent: 1. Input filtration unit; 101. First water path filter element; 102. First air path filter element; 103. Second water path filter element; 104. Nozzle body; 105. Divider; 106. Plug; 107. PTFE gasket; 108. Sealing ring; 109. First connector; 110. Second connector; 111. Water baffle core; 111. Grille seat; 1031. Input pipe; 1032. Water baffle core; 1033. Output pipe; 2. First conveying and filtering unit; 201. Second air path filter element; 202. First outer pipe; 203. Third connector; 3. Back pressure conveying unit; 301. Back pressure component; 302. Adjusting outer tube; 303. Nut; 4. Second conveying and filtering unit; 401. Third water channel filter element; 402. Second outer pipe; 403. First inner pipe; 404. Fourth connector. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this invention.

[0021] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0022] As mentioned in the background section, in view of the problems in the prior art, this embodiment provides an internal nozzle filter structure, including: The input filter unit 1 has a first space and a second space that are not connected to each other, a first water filter 101 that is connected to the first space, a first air filter 102 that is connected to the second space, and a second water filter 103 that is connected to the first space and passes through the first space and the second space in sequence. The first conveying and filtering unit 2, the second water filter element 103 extends from the second space through the first conveying and filtering unit 2 to the outside of the first conveying and filtering unit 2, the first conveying and filtering unit 2 is provided with a third space inside, and a second air filter element 201 communicating with the second space and the third space; Water is filtered once by the first water path filter 101 from the outside, and then enters the first space for secondary filtration by the second water path filter 103; air is filtered once by the first air path filter 102 from the outside, and then enters the second space for secondary filtration by the second air path filter 201 before being output to the third space.

[0023] For details, please refer to Figure 1 , Figure 2 and Figure 3 The input filter unit 1 and the first conveying filter unit 2 are coaxially arranged, and the input filter unit 1 and the first conveying filter unit 2 are detachably connected, which facilitates the cleaning, inspection and maintenance of the input filter unit 1 and the first conveying filter unit 2.

[0024] The input filtration unit 1 is used for the input of water and air, and for the two-stage filtration of water and the one-stage filtration of air. The input filtration unit 1 has a first space and a second space that are not interconnected to form separate water and air paths, enabling independent flow and filtration of water and air. The first water path filter 101 connects the external space to the first space. External water enters the first space after being filtered to remove large particles of impurities by the first water path filter 101. One end of the second water path filter 103 is located inside the first space. Water entering the first space is then filtered by the second water path filter 103 to remove impurities with a diameter smaller than that filtered by the first water path filter 101, and then exits the input filtration unit 1 into the first conveying filtration unit 2, achieving two-stage filtration of water. The first air path filter 102 connects the external space to the second space. External air enters the second space after being filtered to remove large particles of impurities by the first air path filter 102, and is then conveyed to the first conveying filtration unit 2, achieving one-stage filtration of air.

[0025] The first delivery and filtration unit 2 is used for secondary filtration and delivery of gas and water. The first delivery and filtration unit 2 is disposed on one side of the input filtration unit 1. A third space is provided inside the first delivery and filtration unit 2. The second water filter element 103 extends through the second space through the first delivery and filtration unit 2 to the outside of the first delivery and filtration unit 2, further delivering water to the outside of the first delivery and filtration unit 2. The second gas filter element 201, through communication with both the second space and the third space, performs secondary filtration on the gas output from the second space to the first delivery and filtration unit 2 and outputs it to the third space.

[0026] This application utilizes a nozzle internal filtration structure to form a water channel through a first water channel filter, a first space, and a second water channel filter; and a nozzle internal filtration structure to form an air channel through a first air channel filter, a second space, a second air channel filter, and a third space. External water undergoes two filtrations within the water channel by passing through the first and second water channel filters, while external air undergoes two filtrations within the air channel by passing through the first and second air channel filters. This achieves the filtration of impurities, prevents nozzle clogging during use, ensures the efficiency of secondary cooling, and thus improves the quality of the continuously cast billet.

[0027] In a preferred embodiment, the filtration structure further includes a back pressure delivery unit 3, which is disposed on the side of the first delivery filtration unit 2 away from the input filtration unit 1. The back pressure delivery unit 3 has a fourth space communicating with the third space and a back pressure member 301 communicating with the second water filter 103, so that the gas is input from the third space to the fourth space and the water filtered by the second water filter 103 is input to the back pressure member 301 to maintain a stable pressure.

[0028] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 11 As shown, the back pressure conveying unit 3 is used for conveying gas and water and maintaining a stable water pressure. The back pressure conveying unit 3 is located on the side of the first conveying and filtering unit 2 away from the input filtering unit 1. The back pressure conveying unit 3 has a back pressure component 301 and a fourth space communicating with the third space. The back pressure component 301 is connected to the second water path filter 103, so that the water filtered by the second water path filter 103 flows to the back pressure component 301 to maintain a stable pressure of the inflowing water. The gas output from the third space flows through the fourth space and is output to the outside of the back pressure conveying unit 3.

[0029] In a preferred embodiment, the filtration structure further includes a second conveying and filtering unit 4, which is disposed on the side of the back pressure conveying unit 3 away from the first conveying and filtering unit 2. The second conveying and filtering unit 4 has a fifth space and a sixth space that are not interconnected. The fifth space is connected to the back pressure member 301, and the sixth space is connected to the fourth space. A third water path filter 401 is located inside the fifth space, which is used to allow gas in the fourth space to enter the sixth space and water in the back pressure member 301 to enter the fifth space and be filtered by the third water path filter 401.

[0030] Specifically, such as Figure 1 Figure 2 Figure 3 and Figure 13As shown, the second conveying and filtering unit 4 is used for three-stage filtration and conveying of water, as well as for conveying air. The second conveying and filtering unit 4 is located on the side of the back pressure conveying unit 3 away from the first conveying and filtering unit 2. The second conveying and filtering unit 4 has a fifth and a sixth space that are not interconnected to form separate water and air paths, allowing for independent flow of water and air. The fifth space is connected to the back pressure member 301, allowing water in the back pressure member 301 to flow into the fifth space. The third water path filter 401 is located inside the fifth space to perform a third-stage filtration of the water in the fifth space. The sixth space is connected to the fourth space, allowing air from the fourth space to flow into the sixth space.

[0031] In a preferred embodiment, the input filtration unit 1 includes a nozzle body 104, and the nozzle body 104 has a radially extending partition 105 inside, which divides the inside of the nozzle body 104 into a first space and a second space that are not interconnected; the output end of the first water filter 101 is connected to the first space, the output end of the first air filter 102 is connected to the second space, and both the first water filter 101 and the first air filter 102 are provided with a plurality of filter holes for connecting to an external water source and an external air source, respectively.

[0032] Specifically, such as Figure 1 , Figure 8 and Figure 9 As shown, the nozzle body 104 has an internal cavity, and the partition 105 is disposed in the internal cavity of the nozzle body 104 and can be threadedly connected to the nozzle body 104. The partition 105 can be disassembled to clean and maintain the interior of the nozzle body 104, extending the service life of the nozzle. The partition 105 divides the internal cavity of the nozzle body 104 into a first space and a second space that are not interconnected. The partition 105 has multiple symmetrically arranged air passages at the other end near the second air path filter 201, so that the gas in the second space can enter the second air path filter 201 through the air passages of the partition 105. The nozzle body 104 can be made of 304 stainless steel, and the partition 105 can be made of brass.

[0033] like Figure 1 , Figure 4 and Figure 5As shown, the output end of the first water filter 101 is connected to the first space for the flow of water filtered by the first water filter 101, and the output end of the first air filter 102 is connected to the second space for the flow of gas filtered by the first air filter 102. Both the first water filter 101 and the first air filter 102 are provided with multiple filter holes for connecting to external water sources and external air sources, respectively. The filter holes are not limited to elliptical elongated holes, round holes, square holes, rectangular holes, polygonal holes, irregular holes, or similar filter screen structures, and are used to filter impurities in external water and air. The first water filter 101 and the first air filter 102 can be made of 304 stainless steel. In addition, a screw plug 106 is installed at the end of the nozzle body 104 away from the first conveying and filtering unit 2. The nozzle body 104 and the screw plug 106 are sealed by a PTFE gasket 107. After long-term use, the screw plug 106 can be manually removed to facilitate the cleaning of impurity particles on the filter structure inside the nozzle. The screw plug 106 can be made of 304 stainless steel.

[0034] In a preferred embodiment, the nozzle body 104 is a hollow shell with openings at both ends along the axial direction and an internal cavity. It has two through holes communicating with the internal cavity along one radial side. A grid seat 111 is installed on each of the two through holes. The first water filter 101 and the first air filter 102 are respectively installed on the two grid seats 111. The first water filter 101 and the first air filter 102 are both vertical tubes with a semi-circular top and an open bottom. A first connector 109 and a second connector 110 are respectively installed at the bottom openings of the first water filter 101 and the first air filter 102 for connecting to the two grid seats 111 respectively.

[0035] Specifically, such as Figure 1 , Figure 8As shown, the nozzle body 104 is a hollow shell with openings at both ends along the axial direction. The interior is a cavity, and two through holes communicating with the internal cavity are provided on one radial side. These through holes provide mounting positions for the grid seat 111. The grid seat 111 is installed on both through holes. The first water filter 101 and the first air filter 102 are respectively installed on the two grid seats 111, ensuring a sealed connection between the through holes and the first water filter 101, and between the through holes and the first air filter 102. This ensures smooth flow of water and air media while preventing overflow during transport. A first connector 109 and a second connector 110 are also installed at the bottom openings of the first water filter 101 and the first air filter 102, respectively. This allows water passing through the first water filter 101 to enter the first space through the first connector 109, and gas passing through the first air filter 102 to enter the second space through the second connector 110. The grille seat 111 can be made of 304 stainless steel. In addition, the design of the diameter of the first connector 109 and the second connector 110 is based on increasing the water volume adjustment ratio of the nozzle to 40 times and controlling the air-water mass ratio between 0.02 and 0.07.

[0036] In a preferred embodiment, the second water filter element 103 sequentially passes through the first space, the partition 105, and the second space, and the second water filter element 103 is sealed to the partition 105 and the second space. The input end of the second water filter element 103 is provided with a filter hole for communicating with the first space, and the output end of the second water filter element 103 extends through the first conveying and filtering unit 2 to the back pressure conveying unit 3 and communicates with the input end of the back pressure element 301.

[0037] Specifically, such as Figure 1 As shown, the second water filter element 103 sequentially passes through the first space, the partition 105, and the second space. The second water filter element 103 is sealed to the partition 105 and the second space. When the second water filter element 103 passes through the partition 105, it is sealed to the partition 105 through a sealing ring 108. A filter hole is provided on the input end of the second water filter element 103 so that the water in the first space is filtered through the filter hole and then input into the second water filter element 103. The output end of the second water filter element 103 passes through the first conveying and filtering unit 2 and extends to the back pressure conveying unit 3, which is connected to the input end of the back pressure member 301 so that the water that is filtered through the filter hole and input into the second water filter element 103 flows through the first conveying and filtering unit 2 and is output to the back pressure member 301.

[0038] In a preferred embodiment, the second water filter element 103 includes an input pipe 1031, a water-blocking core 1032, and an output pipe 1033 connected in sequence. The outer wall of the input pipe 1031 is provided with a plurality of filter holes for communicating with the first space, and the filter holes are spirally distributed on the outer wall of the input pipe 1031. The water-blocking core 1032 is connected to the input pipe 1031 and the output pipe 1033 respectively, and is disposed at the connection between the second water filter element 103 and the partition 105.

[0039] Specifically, such as Figure 1 and Figure 6 As shown, the input pipe 1031, the water-blocking core 1032, and the output pipe 1033 are connected in sequence, allowing water flowing into the first space to enter through the input pipe 1031, pass through the water-blocking core 1032, and exit through the output pipe 1033. The outer wall of the input pipe 1031 is provided with multiple filter holes for communication with the first space. The filter holes are spirally distributed on the outer wall of the input pipe 1031, allowing the water in the first space to be filtered again. The filter holes are not limited to elliptical elongated holes, round holes, square holes, rectangular holes, polygonal holes, irregularly shaped holes, or similar filter screen structures. The spirally distributed filter holes can accelerate the swirling flow of water flowing into the first space and prevent the accumulation of impurities. The water-blocking core 1032 is located at the connection between the second water path filter element 103 and the partition 105, preventing leakage at the connection between the input pipe 1031 and the output pipe 1033. The output pipe 1033 extends through the first conveying and filtering unit 2 to the back pressure conveying unit 3 and connects to the input end of the back pressure component 301, so that the water output to the output pipe 1033 flows through the first conveying and filtering unit 2 and is output to the back pressure component 301. The pipe diameter design of the output pipe 1033 needs to comprehensively consider back pressure requirements and refined design standards, and at the same time, it needs to meet the flow velocity specifications under minimum and maximum flow rates, as well as the requirements for laminar and turbulent flow states. In this embodiment, the minimum Reynolds number of the water in the output pipe 1033 is set to 2300. The pipe diameter of the output pipe 1033 under different flow conditions needs to be matched and designed according to the above parameters. The output pipe 1033 is a bright inner wall pipe with a brightness accuracy of not less than 3.2 to reduce resistance. The input pipe 1031 and the water-blocking core 1032 of the second water filter component 103 can be made of brass, and the output pipe 1033 of the second water filter component 103 can be made of 304 stainless steel.

[0040] In a preferred embodiment, the first delivery and filtration unit 2 includes a first outer tube 202, and a second air path filter 201 is disposed inside the first outer tube 202. The third space is formed between the first outer tube 202 and the second air path filter 201. The input end of the second air path filter 201 is connected to the second space, and the outer wall of the second air path filter 201 is provided with filter holes so that the gas in the second space enters the third space after being filtered by the second air path filter 201.

[0041] Specifically, such as Figure 1 and Figure 10 As shown, the first outer tube 202 is a straight tube with openings on both sides. One end is connected to the nozzle body 104, and the other end is connected to the back pressure conveying unit 3 via a nut 303. The second air path filter element 201 is installed inside the first outer tube 202, forming the third space between the first outer tube 202 and the second air path filter element 201. The second air path filter element 201 is a hollow shell, and the output pipe of the second water path filter element 103 passes through the second air path filter element 201. The sidewall of the second air path filter element 201 is away from the input filter unit 1. One end of the first outer tube 202 is provided with an array of filter holes, allowing the gas in the second space to enter the third space after being filtered through these holes. The filter holes are not limited to elliptical elongated holes, round holes, square holes, rectangular holes, polygonal holes, irregularly shaped holes, or similar filter mesh structures. The diameter of the first outer tube 202 is selected based on controlling the airflow velocity in the third space to reach 60 m / s. The diameter selection of the first outer tube 202 under different flow conditions must be matched and designed according to the above parameters. Furthermore, the first outer tube 202 is a tube with a bright inner wall, and the brightness precision is not less than 3.2, in order to reduce resistance. The first outer tube 202 can be made of 304 stainless steel, and the second gas path filter element 201 can be made of brass or other high-temperature resistant materials. In addition, the third connector 203 is provided at one end of the first outer tube 202 near the back pressure conveying unit 3. The third connector 203 includes a first channel and a second channel that are not interconnected. The first channel allows the gas in the third space to flow to the fourth space. One end of the second channel is connected to the second water filter 103, and the other end is connected to the back pressure component 301, allowing the water filtered by the second water filter 103 to flow to the back pressure component 301. The third connector 203 can be made of 304 stainless steel.

[0042] In a preferred embodiment, the back pressure conveying unit 3 includes an adjusting outer tube 302, inside which the back pressure component 301 is disposed, and the fourth space is formed between the adjusting outer tube 302 and the back pressure component 301. One end of the adjusting outer tube 302 is connected to the first conveying and filtering unit 2, and the other end is connected to the second conveying and filtering unit 4, so that the third space, the fourth space, and the sixth space are sequentially connected. The output end of the back pressure component 301 is connected to the fifth space of the second conveying and filtering unit 4.

[0043] Specifically, such as Figure 1 and Figure 12 As shown, the adjusting outer tube 302 is a corrugated pipe with openings on both sides. The back pressure member 301 is disposed inside the adjusting outer tube 302, forming the fourth space between the back pressure member 301 and the adjusting outer tube 302. One end of the adjusting outer tube 302 is connected to the first outer tube 202 via a nut 303, and the other end of the adjusting outer tube 302 is connected to the second conveying and filtering unit 4 via a nut 303, so that the third space, the fourth space, and the sixth space are sequentially connected, allowing the gas to flow from the third space through the fourth space and then be output to the sixth space. The back pressure member 301 has straight pipes at both ends and a spiral pipe in the middle, with its output end connected to the fifth space, outputting water from the back pressure member 301 to the fifth space. The design of the back pressure component 301 must be based on the minimum water pressure required for the nozzle's minimum flow rate (where the minimum water pressure is typically set to 0.07 MPa, the maximum pressure to 0.7 MPa, the pressure multiplier to be 10, and the corresponding water flow rate design range to be 40 times the minimum flow rate). The back pressure component 301 is used to ensure the stability of the nozzle's working pressure under minimum flow rate conditions, ensuring that atomization and spraying can be achieved at the minimum flow rate under the drag force generated by air pressure and air volume. Its structural form is determined by the water pressure requirements corresponding to the minimum and maximum flow rates, therefore requiring targeted special design and repeated verification. The adjusting outer tube 302 can be made of a moderately flexible metal material such as brass, and the back pressure component 301 can be made of 304 stainless steel.

[0044] In a preferred embodiment, the second conveying and filtering unit 4 includes a second outer tube 402 and a first inner tube 403 disposed inside the second outer tube 402. The third water path filter element 401 is disposed inside the first inner tube 403. A fifth space is formed between the first inner tube 403 and the third water path filter element 401. A sixth space is formed between the second outer tube 402 and the first inner tube 403. The third water path filter element 401 has multiple filter holes so that water entering the fifth space is filtered by the third water path filter element 401.

[0045] Specifically, such as Figure 1 and Figure 13 As shown, the second outer pipe 402 and the first inner pipe 403 are both straight pipes open at both ends. The first inner pipe 403 is disposed inside the second outer pipe 402. The third water filter element 401 is disposed inside the first inner pipe 403. A fifth space is formed between the first inner pipe 403 and the third water filter element 401, and a sixth space is formed between the second outer pipe 402 and the first inner pipe 403. The third water filter element 401 is a hollow pipe, and an array of filters is provided on the inner wall of the third water filter element 401. The holes are used to filter the water in the input fifth space three times, and the filter holes are not limited to elliptical elongated holes, round holes, square holes, rectangular holes, polygonal holes, irregular holes or similar filter screen structures; the first inner tube 403 is provided with the fourth connector 404 at one end near the back pressure member 301, and the fourth connector is used to connect the first inner tube 403 and the back pressure member 301; the second outer tube 402, the first inner tube 403, the third water filter member 401, and the fourth connector 404 can all be made of 304 stainless steel.

[0046] This application utilizes a nozzle internal filtration structure to form a water channel through a first water path filter, a first space, a second water path filter, a back pressure component, a fifth space, and a third water path filter; and a nozzle internal filtration structure to form an air path through a first air path filter, a second space, a second air path filter, a third space, a fourth space, and a sixth space. External water undergoes three filtrations within the water path through the first, second, and third water path filters, while external air undergoes two filtrations within the air path through the first and second air path filters. This achieves the filtration of impurities, preventing nozzle clogging during use, ensuring the efficiency of secondary cooling, and thus improving the quality of the continuously cast billet. Furthermore, the use of a back pressure component ensures a stable water supply, maintaining a stable water flow even at relatively low flow rates.

[0047] To facilitate understanding by those skilled in the art, the workflow of the nozzle internal filtration structure provided in this application is as follows: External water is initially filtered by the first water path filter element 101 in the input filtration unit 1, enters the first space separated by the partition 105 within the nozzle body 104, and then sequentially passes through the input pipe 1031 (containing spiral filter holes) of the second water path filter element 103, the water-blocking core 1032, and the output pipe 1033. After being transported through the output pipe 1033 to the back pressure member 301 of the back pressure conveying unit 3 for pressure stabilization, it enters the second conveying filtration unit 4. The first inner tube 403 enters the fifth space between the first inner tube 403 and the third water filter 401, and then enters the third water filter 401 for three filtrations. The external air source enters the second space after being initially filtered by the first air filter 102, and then enters the third space after being filtered a second time by the second air filter 201 in the first conveying and filtering unit 2. It is then conveyed sequentially through the fourth space between the adjusting outer tube 302 and the back pressure component 301 in the back pressure conveying unit 3, and the sixth space between the second outer tube 402 and the first inner tube 403 in the second conveying and filtering unit 4.

[0048] This application utilizes a nozzle internal filtration structure to form a water channel through a first water path filter, a first space, a second water path filter, a back pressure component, a fifth space, and a third water path filter; and a nozzle internal filtration structure to form an air path through a first air path filter, a second space, a second air path filter, a third space, a fourth space, and a sixth space. External water undergoes three filtrations within the water path through the first, second, and third water path filters, while external air undergoes two filtrations within the air path through the first and second air path filters. This achieves the filtration of impurities, preventing nozzle clogging during use, ensuring the efficiency of secondary cooling, and thus improving the quality of the continuously cast billet. Furthermore, the use of a back pressure component ensures a stable water supply, maintaining a stable water flow even at relatively low flow rates.

[0049] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A nozzle internal filter structure, characterized in that, include: The input filter unit (1) has a first space and a second space that are not connected to each other, a first water filter (101) connected to the first space, a first air filter (102) connected to the second space, and a second water filter (103) connected to the first space and passing through the first space and the second space in sequence. The first conveying and filtering unit (2) has a second water filter element (103) extending from the second space through the first conveying and filtering unit (2) to the outside of the first conveying and filtering unit (2). The first conveying and filtering unit (2) has a third space inside and a second air filter element (201) communicating with the second space and the third space. Water is filtered once by the first water path filter (101) from the outside, and then enters the first space for secondary filtration by the second water path filter (103); air is filtered once by the first air path filter (102) from the outside, and then enters the second air path filter (201) through the second space for secondary filtration before being output to the third space.

2. The nozzle internal filtration structure according to claim 1, characterized in that, The filtration structure further includes a back pressure conveying unit (3), which is located on the side of the first conveying filtration unit (2) away from the input filtration unit (1). The back pressure conveying unit (3) has a fourth space communicating with the third space and a back pressure member (301) communicating with the second water filter (103) so that the air is input from the third space to the fourth space and the water filtered by the second water filter (103) is input into the back pressure member (301) to maintain a stable pressure.

3. The nozzle internal filtration structure according to claim 2, characterized in that, The filtration structure further includes a second conveying and filtering unit (4), which is located on the side of the back pressure conveying unit (3) away from the first conveying and filtering unit (2). The second conveying and filtering unit (4) has a fifth space and a sixth space that are not connected to each other. The fifth space is connected to the back pressure member (301), and the sixth space is connected to the fourth space. A third water path filter (401) is located inside the fifth space, which is used to allow gas in the fourth space to enter the sixth space and allow water in the back pressure member (301) to enter the fifth space and be filtered by the third water path filter (401).

4. The nozzle internal filtration structure according to claim 3, characterized in that, The input filter unit (1) includes a nozzle body (104), and the nozzle body (104) has a radially extending partition (105) inside, which divides the inside of the nozzle body (104) into a first space and a second space that are not connected to each other; the output end of the first water filter (101) is connected to the first space, and the output end of the first air filter (102) is connected to the second space, and both the first water filter (101) and the first air filter (102) are provided with multiple filter holes for connecting to external water sources and external air sources respectively.

5. The nozzle internal filtration structure according to claim 4, characterized in that, The nozzle body (104) is a hollow shell with openings at both ends along the axial direction and an internal cavity. It has two through holes communicating with the cavity along one radial side. A grid seat (111) is installed on each of the two through holes. The first water filter (101) and the first air filter (102) are respectively installed on the two grid seats (111). The first water filter (101) and the first air filter (102) are both vertical tubes with a semi-circular top and an open bottom. A first connector (109) and a second connector (110) are respectively installed at the bottom openings of the first water filter (101) and the first air filter (102) for connecting to the two grid seats (111) respectively.

6. The nozzle internal filtration structure according to claim 4, characterized in that, The second water filter element (103) passes through the first space, the partition (105) and the second space in sequence, and the second water filter element (103) is sealed to the partition (105) and the second space. The input end of the second water filter element (103) is provided with a filter hole for communicating with the first space. The output end of the second water filter element (103) passes through the first conveying filter unit (2) and extends to the back pressure conveying unit (3) and communicates with the input end of the back pressure element (301).

7. The nozzle internal filtration structure according to claim 6, characterized in that, The second water filter element (103) includes an input pipe (1031), a water-blocking core (1032), and an output pipe (1033) connected in sequence. The input pipe (1031) has a plurality of filter holes on its outer wall for communicating with the first space. The filter holes are spirally distributed on the outer wall of the input pipe (1031). The water-blocking core (1032) is connected to the input pipe (1031) and the output pipe (1033) respectively, and is located at the connection between the second water filter element (103) and the partition (105).

8. The nozzle internal filtration structure according to claim 1, characterized in that, The first delivery and filtration unit (2) includes a first outer tube (202), and a second air path filter (201) is provided inside the first outer tube (202). The third space is formed between the first outer tube (202) and the second air path filter (201). The input end of the second air path filter (201) is connected to the second space, and the outer wall of the second air path filter (201) is provided with filter holes so that the gas in the second space enters the third space after being filtered by the second air path filter (201).

9. The nozzle internal filtration structure according to claim 3, characterized in that, The back pressure conveying unit (3) includes an adjusting outer tube (302), and the back pressure component (301) is disposed inside the adjusting outer tube (302). The fourth space is formed between the adjusting outer tube (302) and the back pressure component (301). One end of the adjusting outer tube (302) is connected to the first conveying and filtering unit (2), and the other end is connected to the second conveying and filtering unit (4), so that the third space, the fourth space, and the sixth space are connected in sequence. The output end of the back pressure component (301) is connected to the fifth space of the second conveying and filtering unit (4).

10. The nozzle internal filtration structure according to claim 3, characterized in that, The second conveying and filtering unit (4) includes a second outer tube (402) and a first inner tube (403) disposed inside the second outer tube (402). The third water path filter element (401) is disposed inside the first inner tube (403). A fifth space is formed between the first inner tube (403) and the third water path filter element (401). A sixth space is formed between the second outer tube (402) and the first inner tube (403). The third water path filter element (401) has multiple filter holes so that the water entering the fifth space is filtered by the third water path filter element (401).

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