Conical solid nozzle for square and round billet continuous casting machine

Abstract

According to the conical solid nozzle for the square and round billet continuous casting machine, a mixing cavity, an air inlet cavity and a liquid inlet cavity are formed in a base body, and the air inlet cavity and the liquid inlet cavity communicate with the mixing cavity; a backflow cavity is further arranged between the liquid inlet cavity and the mixing cavity and used for increasing water supply backpressure. The sprayer is connected with the base body through a connecting assembly and internally provided with a nozzle core. The outer ring of the nozzle core is provided with uniformly distributed rotational flow grooves in the circumferential direction to form a solid spraying structure for improving the atomization uniformity; the two ends of the connecting assembly are detachably connected with the spray head and the base body correspondingly and used for communicating the nozzle core with the mixing cavity. The rotational flow grooves distributed in the circumferential direction are formed in the outer ring of the nozzle core, so that a solid spraying structure is formed, the problems that a traditional nozzle is prone to annular spraying, and no water exists in the center or little water exists in the center are effectively solved, gas-water media are fully mixed and evenly atomized, and therefore the uniformity of secondary cooling of a continuous casting billet is guaranteed, and the service life of the continuous casting billet is prolonged. And the risks of quality defects such as corner cracks and middle cracks of the casting blank are reduced.

Description

Technical Field

[0001] This application relates to the field of continuous casting machine technology, specifically to a conical solid nozzle for a square and round billet continuous casting machine. Background Technology

[0002] In the production process of square and round billet continuous casting machines, the state of secondary cooling plays a crucial role in the quality of the continuously cast billet. Deterioration of cooling uniformity and a high rate of online nozzle blockage will seriously affect secondary cooling, thereby affecting the quality of the continuously cast billet. In particular, the requirements for secondary cooling are even more stringent for continuous casting machines that mainly produce alloy steel and special steel. The online defect rate of the nozzle (blockage, solid, gas) must be strictly controlled within 2%. Otherwise, quality defects such as increased segregation, corner cracks, and intermediate cracks will occur in the continuously cast billet. At present, the problem of uneven cooling is common in the secondary cooling of domestic continuous casting machines. The main problem is that the online defect rate of the secondary cooling nozzle is higher than 5%. The core issues are nozzle blockage, nozzle ring spraying, no water or insufficient water in the middle, and deformation leading to misalignment of cooling. These are common problems in continuous casting machines equipped with ordinary simple nozzles. This will seriously restrict the increase of continuous casting machine output and the guarantee of billet quality. Therefore, the above problems urgently need to be solved. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a conical solid nozzle for a square and round billet continuous casting machine.

[0004] This application provides a conical solid nozzle for a square and round billet continuous casting machine, including... The matrix has a mixing chamber inside, as well as an air inlet chamber and a liquid inlet chamber that are respectively connected to the mixing chamber; A reflux chamber is also provided between the liquid inlet chamber and the mixing chamber to increase the back pressure of the water supply; The nozzle is connected to the base via a connecting assembly and has a nozzle core inside; The outer ring of the nozzle core is provided with uniformly arranged swirl grooves along the circumference to form a solid spray structure, which is used to improve atomization uniformity. The number of swirl channels is even, and opposite swirl channels are connected by a converging channel; The gathering groove is located on the end face of the nozzle core away from the substrate; The two ends of the connecting assembly are detachably connected to the nozzle and the base, respectively, for connecting the nozzle core and the mixing chamber.

[0005] Furthermore, The air intake chamber is coaxially arranged with the mixing chamber, located at the end of the mixing chamber away from the nozzle, and a first connecting hole is provided between the air intake chamber and the mixing chamber; The end of the air intake chamber away from the mixing chamber is an open structure, and an air intake grille is provided inside. The air intake grille is threadedly connected to the base, and the end is provided with a first interface for connecting to an external air source.

[0006] Furthermore, The end of the liquid inlet chamber away from the nozzle is an open structure, and a water inlet grille is provided inside. The water inlet grille is threadedly connected to the base, and its end is provided with a second interface for connecting to a water supply device.

[0007] Furthermore, The reflux chamber is provided with a reflux component inside, and a second connecting hole and a third connecting hole are respectively provided on both sides of the reflux component; The second connecting hole extends radially along the reflux cavity and is used to communicate with the liquid inlet cavity; The third connecting hole extends radially along the reflux cavity and is used to communicate with the mixing cavity.

[0008] Furthermore, The outer diameter of the reflux component matches the inner diameter of the reflux cavity. The outer wall is provided with a circumferentially extending serpentine flow channel groove, and the interior is provided with a coaxial flow channel hole. The starting point of the flow channel groove is connected to the second connecting hole, and the ending point is connected to the flow channel hole through the fourth connecting hole; The flow channel hole also passes through the return component and connects with the third connecting hole via the fifth connecting hole.

[0009] Furthermore, The reflux chamber is also provided with a detachable pressure cap to prevent the reflux component from leaving the reflux chamber; The gland is threadedly connected to the base body, and a sealing ring is also provided between it and the return component.

[0010] Furthermore, The connection assembly includes a first connector connected to the nozzle and a second connector connected to the substrate; The first connector and the second connector are connected by a connecting pipe and are detachably connected to the connecting pipe respectively.

[0011] Furthermore, One end of the connecting pipe is directly connected to the first connector, and the other end is connected to the second connector through a third connector. The first connector, the third connector, and the connecting pipe are all threaded connections; The second and third connectors are connected by a threaded sleeve.

[0012] Furthermore, The threaded sleeve has a variable diameter structure, with the inner diameter of the smaller diameter matching the diameter of the third connector, and the inner wall of the larger diameter having an internal thread. The third connector has an annular protrusion to prevent the threaded sleeve from disengaging from the third connector; The second connector has a matching external thread corresponding to the internal thread, for threaded connection with the threaded sleeve.

[0013] Furthermore, The nozzle is also equipped with a flow guide plate; The guide vane is located between the nozzle core and the connecting pipe.

[0014] The advantages and positive effects of this application are: This technical solution forms a solid spray structure by setting circumferentially arranged swirling grooves on the outer ring of the nozzle core. This effectively solves the problems of annular spraying and lack of water or water in the center that are common in traditional nozzles. It achieves full mixing and uniform atomization of the gas and water media, thereby ensuring the uniformity of secondary cooling of the continuous casting billet and reducing the risk of quality defects such as corner cracks and middle cracks in the billet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a conical solid nozzle for a square and round billet continuous casting machine provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the base of the conical solid nozzle for a square and round billet continuous casting machine provided in the embodiments of this application; Figure 3 This is a schematic diagram of the nozzle core of a conical solid nozzle for a square and round billet continuous casting machine provided in an embodiment of this application.

[0016] The text labels in the figure are as follows: 100-substrate; 110-mixing chamber; 120-air inlet chamber; 121-air inlet grille; 130-liquid inlet chamber; 131-water inlet grille; 140-return chamber; 141-return component; 142-cap; 143-sealing ring; 200-nozzle; 210-nozzle core; 211-swirl channel; 220-guide vane; 300-connecting pipe; 310-first connector; 320-second connector; 330-third connector; 340-threaded sleeve. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this application, the application will be described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory, and should not be used to limit the scope of protection of this application.

[0018] Please refer to Figures 1-3This embodiment provides a conical solid nozzle for a square and round billet continuous casting machine, including a base 100. The base 100 has a mixing chamber 110 and an air inlet chamber 120 and a liquid inlet chamber 130 respectively communicating with the mixing chamber 110. A reflux chamber 140 is also provided between the liquid inlet chamber 130 and the mixing chamber 110 to increase the back pressure of the water supply. A nozzle 200 is connected to the base 100 via a connecting assembly and has a nozzle core 210 inside. The outer ring of the core 210 is provided with evenly arranged swirl grooves 211 along the circumference to form a solid spray structure, which is used to improve the atomization uniformity. The number of swirl grooves 211 is even, and opposite swirl grooves 211 are connected by a converging groove. The converging groove is located on the end face of the nozzle core 210 away from the base 100. The two ends of the connecting assembly are detachably connected to the nozzle 200 and the base 100, respectively, for connecting the nozzle core 210 and the mixing chamber 110.

[0019] In this embodiment, the substrate 100 is the main support structure of the nozzle, and multiple interconnected chambers are machined inside it; among them, a mixing chamber 110 is provided, which is the main space for the initial mixing of gas and liquid media; on the substrate 100, an air inlet chamber 120 and a liquid inlet chamber 130 are respectively provided and connected to the mixing chamber 110; the air inlet chamber 120 is used to introduce the compressed gas required for atomization, and the liquid inlet chamber 130 is used to introduce cooling water.

[0020] In this embodiment, in order to optimize the water supply characteristics, a return chamber 140 is specially provided on the connection passage between the liquid inlet chamber 130 and the mixing chamber 110. The function of the return chamber 140 is to apply a certain flow resistance to the incoming cooling water, thereby increasing the back pressure of the water supply, making the water flow more stable, which helps to maintain a good atomization state within a wide flow adjustment range and avoids the phenomenon of discontinuous "breathing" of water flow.

[0021] In this embodiment, the nozzle 200 is the final spray component of the nozzle, which is installed at the outlet end of the base 100 through a set of connecting components. The core of the nozzle 200 is a nozzle core 210. The significant feature of the nozzle core 210 is that six evenly arranged swirling grooves 211 are machined along the circumferential direction on its outer circumferential surface. The geometry and spatial arrangement of these swirling grooves 211 are specially designed. Their function is not only to guide the fluid to rotate, but also to work with a specially designed converging structure to converge and shape the atomized fluid. This combination of swirling and converging design is the key to forming an ideal spray pattern. When the initially mixed gas-water two-phase flow passes through the swirling and converging action area, the fluid is fully broken up, rotated, and finally converges towards the central axis, thereby forming a solid cone-shaped spray structure with a dense center, clear edges, and uniform flow distribution. This structure effectively controls the spray angle and coverage area, fundamentally solving the problems of annular spray and cooling dead angles with little or no water in the center that are common in traditional nozzles, and significantly improving the uniformity and stability of atomization cooling.

[0022] In this embodiment, the connecting assembly is connected between the nozzle 200 and the base 100, and a flow channel is formed inside it to guide the initially mixed medium in the mixing chamber 110 of the base 100 to the nozzle core 210 of the nozzle 200. An important feature of this connecting assembly is that its two ends are detachably connected to the nozzle 200 and the base 100, respectively. This design allows the nozzle to be easily removed from the base for cleaning, inspection or replacement, which greatly facilitates maintenance and helps to ensure the long-term online integrity of the nozzle.

[0023] In a preferred embodiment, the air intake chamber 120 is coaxially arranged with the mixing chamber 110, located at the end of the mixing chamber 110 away from the nozzle 200, and a first communicating hole is provided between the air intake chamber 120 and the mixing chamber 110; the end of the air intake chamber 120 away from the mixing chamber 110 is an open structure, and an air intake grille 121 is provided inside; the air intake grille 121 is threadedly connected to the base 100, and a first interface for connecting to an external air source is provided at its end.

[0024] In this embodiment, the air inlet chamber 120 serves as an input channel for compressed gas, and its arrangement has a clear orientation and structural features. The axis of the air inlet chamber 120 is coaxial with the axis of the mixing chamber 110, ensuring that the gas can smoothly enter the mixing area along the axial direction. In terms of spatial position, the air inlet chamber 120 is located at the end of the mixing chamber 110 away from the nozzle 200, that is, it is located at the tail or rear of the base 100, so that the gas and liquid media can form a relatively reasonable flow sequence and mixing path in the mixing chamber 110.

[0025] In this embodiment, in order to transport gas from the intake chamber 120 to the mixing chamber 110, one or more first connecting holes are provided on the cavity wall or transition structure between the two; these first connecting holes constitute the necessary channel for gas to enter the mixing chamber 110.

[0026] In this embodiment, the air intake chamber 120 is designed as an open structure at its other end away from the mixing chamber 110, that is, the end facing the external air source. Inside this open end, a key filter and guide component, the air intake grille 121, is provided. The air intake grille 121 is mainly fixedly installed on the base 100 by means of threaded connection. This connection method not only ensures the firmness of the connection, but also facilitates its disassembly, cleaning or replacement.

[0027] In this embodiment, the air intake grille 121 has a dual function: firstly, its grille structure can perform preliminary filtration of the incoming compressed gas, intercepting large particulate impurities that may be carried in the gas, and preventing them from entering the internal flow channel of the nozzle and causing blockage or wear; secondly, it serves as a structural interface component; at its exposed end, a standard first interface is usually provided, which is specifically used to connect with an external gas source pipeline and is the inlet for the gas medium to enter the nozzle.

[0028] In a preferred embodiment, the end of the liquid inlet chamber 130 away from the nozzle 200 is an open structure, and a water inlet grille 131 is provided inside; the water inlet grille 131 is threadedly connected to the base 100, and a second interface for connecting to a water supply device is provided at the end.

[0029] In this embodiment, the liquid inlet chamber 130 serves as the input channel for cooling water, and its structural design aims to ensure the stability and cleanliness of the water supply. The liquid inlet chamber 130 is located on the base 100, with one end connected to the subsequent back pressure regulating unit, while the other end, that is, the end away from the nozzle 200, is designed as an open structure. This open design provides a direct and convenient interface position for the connection of the external water supply pipeline.

[0030] In this embodiment, in order to perform necessary pretreatment on the cooling water entering the nozzle, a key filter component, a water inlet grille 131, is provided inside the open-structured liquid inlet chamber 130. The water inlet grille 131 is mainly fixedly installed on the base 100 by a threaded connection. This threaded connection not only ensures the firmness and sealing of the water inlet grille 131 installation, but more importantly, it makes it detachable. When the grille needs to be cleaned due to intercepting impurities, or needs to be replaced due to long-term use, it can be easily unscrewed from the base 100, greatly simplifying the maintenance process.

[0031] In this embodiment, the core function of the inlet grille 131 is filtration; its grille structure can effectively intercept larger particulate impurities that may be contained in the cooling water, such as iron filings and scale fragments, to achieve primary purification of the cooling water before it enters the core flow channel of the nozzle; this design is directly aimed at the working condition where the secondary cooling water quality of continuous casting may be poor, and aims to reduce the entry of impurities from the source, which is the primary measure to reduce the risk of internal blockage of the nozzle and ensure its long-term stable operation.

[0032] In addition, the water inlet grille 131 has a second interface at its exposed end; this second interface is specifically designed for connection with an external water supply device and is the inlet point for the cooling water medium to enter the nozzle.

[0033] In a preferred embodiment, the reflux cavity 140 is provided with a reflux member 141 inside, and a second connecting hole and a third connecting hole are respectively provided on both sides of the reflux member 141; the second connecting hole extends radially along the reflux cavity 140 and is used to communicate with the liquid inlet cavity 130; the third connecting hole extends radially along the reflux cavity 140 and is used to communicate with the mixing cavity 110.

[0034] In this embodiment, the reflux chamber 140 is a chamber independently disposed between the liquid inlet chamber 130 and the mixing chamber 110; a key fluid control component reflux element 141 is provided inside it; the reflux element 141 is accommodated and positioned in the internal space of the reflux chamber 140.

[0035] In this embodiment, in order to achieve directional guidance and pressure regulation of water flow, important fluid channel interfaces are respectively provided on the two cavity walls of the return member 141.

[0036] Specifically, a second connecting hole is provided on one side of the return member 141, and a third connecting hole is provided on the other side.

[0037] In this embodiment, the second connecting hole extends radially along the return cavity 140; this means that the hole is perpendicular or approximately perpendicular to the axial direction of the return cavity 140; its core function is to achieve fluid communication with the liquid inlet cavity 130; the cooling water, after being initially filtered by the water inlet grille 131, enters the return component 141 area in the return cavity 140 from the liquid inlet cavity 130 through the second connecting hole, thereby completing the first turning and distribution of the water path.

[0038] Correspondingly, the third connecting hole also adopts a radially extending arrangement along the return cavity 140; the main function of this channel is to achieve fluid communication with the mixing cavity 110; the cooling water flowing through the return component 141 finally leaves the return cavity 140 through this third connecting hole and is radially injected into the mixing cavity 110, ready to be mixed with the gas.

[0039] In a preferred embodiment, the outer diameter of the return member 141 matches the inner diameter of the return cavity 140, and the outer wall is provided with a flow channel groove extending in a circumferential serpentine shape, and the interior is provided with a coaxial flow channel hole; the starting point of the flow channel groove is connected to the second connecting hole, and the ending point is connected to the flow channel hole through the fourth connecting hole; the flow channel hole also passes through the return member 141 through the fifth connecting hole and is connected to the third connecting hole.

[0040] In this embodiment, the return component 141 is an independently machined part, and its outer diameter is closely matched with the inner diameter of the return cavity 140. This matching relationship ensures that the return component 141 can be stably accommodated in the return cavity 140 and provides a precise positioning basis for its complex internal flow channels, while also facilitating the control of the water flow state within it.

[0041] In this embodiment, the unique design of the return component 141 is reflected in the flow guiding structure on its surface; on its outer ring wall, there is a flow channel groove that extends along the circumferential direction in a serpentine or similar tortuous path; this serpentine extension design significantly extends the passage path of water flow on the surface of the return component 141; at the same time, at the internal axial position of the return component 141, there is also a flow channel hole coaxial with its own axis; the surface flow channel groove and the internal flow channel hole are combined through a specific connecting structure to form a complete and optimized internal water channel.

[0042] In this embodiment, the path of the water flow is precisely designed: First, the water flow entering from the inlet chamber 130 through the second connecting hole directly connects to the starting point of the serpentine flow channel; the water flow is then forced to flow along this preset, meandering serpentine channel, undergoing multiple turns and path extensions. This process essentially increases the water flow resistance and flow rate, thereby effectively establishing the required back pressure; when the water flow reaches the preset end point of the serpentine flow channel, it does not flow out directly, but instead enters the coaxial flow channel hole inside the return member 141 from the surface through a fourth connecting hole.

[0043] In this embodiment, after the water enters the internal flow channel hole, it continues to flow axially; finally, the water passes through a fifth connecting hole through the solid part of the return member 141 and is discharged from the internal flow channel hole; the outlet end of this fifth connecting hole is configured to precisely connect with the third connecting hole leading to the mixing chamber 110.

[0044] In this embodiment, the end face of the return member 141 and the bottom of the return cavity 140 can be provided with matching spline grooves for effective positioning.

[0045] In a preferred embodiment, the reflux cavity 140 is further provided with a detachable pressure cap 142 for restricting the reflux component 141 from leaving the reflux cavity 140; the pressure cap 142 is threadedly connected to the base 100, and a sealing ring 143 is provided between the pressure cap 142 and the reflux component 141.

[0046] In this embodiment, to ensure that the return component 141 does not move axially or come out of the return cavity 140 when subjected to water pressure, a detachable pressure cap 142 is provided at the opening end or corresponding position of the return cavity 140. The core function of the pressure cap 142 is to limit the return component 141 axially, thereby preventing the return component 141 from leaving the return cavity 140 in the working state. This mechanical limitation is the key to ensuring that the internal precision flow channel can always be precisely aligned with the second and third connecting holes, maintaining unobstructed water flow and stable back pressure function.

[0047] In this embodiment, the connection between the pressure cap 142 and the base 100 adopts a reliable and easy-to-operate threaded connection method; that is, the pressure cap 142 is fixed by screwing the thread on its outer wall into the internal thread of the base 100 at the port of the return cavity 140. This connection method not only provides sufficient locking force to resist internal water pressure, but more importantly, it gives the structure complete disassembly. When it is necessary to clean the return component 141, check the flow channel or replace the sealing element, simply unscrew the pressure cap 142, making maintenance very convenient.

[0048] In this embodiment, the machining of the flow channel hole necessitates that one end of it be an open structure. By setting a sealing ring 143 between the pressure cap 142 and the return component 141, the flow channel hole can be effectively isolated and sealed.

[0049] In a preferred embodiment, the connecting assembly includes a first connector 310 connected to the nozzle 200 and a second connector 320 connected to the base 100; the first connector 310 and the second connector 320 are connected by a connecting pipe 300 and are detachably connected to the connecting pipe 300 respectively.

[0050] In this embodiment, the connection assembly mainly includes two core connection components: a first connector 310 connected to the nozzle 200 and a second connector 320 connected to the base 100. The first connector 310 is directly fixed to the inlet end of the nozzle 200, and the second connector 320 is directly fixed to the outlet end of the mixing chamber 110 on the base 100. The two serve as interfaces between the nozzle 200 and the base 100 and external connecting pipelines, respectively.

[0051] In this embodiment, in order to achieve fluid communication between the nozzle 200 and the substrate 100 and allow for a certain gap or position adjustment space between them, a hollow connecting pipe 300 is used to connect the first connector 310 and the second connector 320; the connecting pipe 300 constitutes the main channel for conveying the mixed gas-water medium from the mixing chamber 110 of the substrate 100 to the nozzle core 210 of the nozzle 200.

[0052] In this embodiment, the first connector 310 is detachably connected to the connecting pipe 300, and the second connector 320 is also detachably connected to the connecting pipe 300. This design means that the entire connection assembly can be easily disassembled from the nozzle 200 and the base 100, or the nozzle 200 or the base 100 can be disassembled and maintained separately without completely disassembling other parts.

[0053] In a preferred embodiment, one end of the connecting pipe 300 is directly connected to the first connector 310, and the other end is connected to the second connector 320 through the third connector 330; the first connector 310, the third connector 330 and the connecting pipe 300 are all threaded connections; the second connector 320 and the third connector 330 are connected through a threaded sleeve 340.

[0054] In this embodiment, one end of the connecting pipe 300 is fixed to the first connector 310 by direct connection; this means that the first connector 310 can be directly assembled to the corresponding end of the connecting pipe 300 by threaded connection, snap-fit ​​or other mechanical means to form a rigid connecting unit.

[0055] The other end of the connecting pipe 300 is indirectly connected to the second connector 320 through an independent third connector 330. Here, the third connector 330 acts as an intermediate connector, with one end connected to the connecting pipe 300 and the other end used to connect to the second connector 320.

[0056] In this embodiment, threaded connections are used between the first connector 310 and the third connector 330, as well as between the first connector 310 and the connecting pipe 300. This design ensures that the entire upstream connection section from the first connector 310 to the connecting pipe 300 and then to the third connector 330 has reliable sealing and structural rigidity, and can stably transmit the gas-water mixed medium from the mixing chamber 110.

[0057] In this embodiment, the second connector 320 and the third connector 330 are connected by an independent threaded sleeve 340; that is, the threaded sleeve 340 is a fastener that is fitted onto the mating part of the second connector 320 and the third connector 330, and the two are tightened and fixed together by tightening action, while ensuring the sealing of the mating surface.

[0058] In a preferred embodiment, the threaded sleeve 340 has a variable diameter structure, with the inner diameter of the minor diameter matching the diameter of the third connector 330, and the inner wall of the major diameter having an internal thread; the third connector 330 has an annular protrusion to restrict the threaded sleeve 340 from disengaging from the third connector 330; the second connector 320 has a matching external thread corresponding to the internal thread for threaded connection with the threaded sleeve 340.

[0059] In this embodiment, the threaded sleeve 340 is an independent fastening sleeve, and the core of its structural design lies in the adoption of a variable diameter structure.

[0060] Specifically, the threaded sleeve 340 has a smaller inner diameter at one end, forming a small-diameter section; and a larger inner diameter at the other end, forming a large-diameter section. The inner diameter of the small-diameter section matches the diameter of its mating part on the third connector 330. This matching usually means that the inner wall of the small-diameter section can be a smooth cylindrical surface, forming a tight clearance fit or transition fit with the outer cylindrical surface of the third connector 330. Its main function is to radially position and guide the third connector 330, ensuring that the two can be aligned with the central axis during assembly. Internal threads are machined on the inner wall of the large-diameter section of the threaded sleeve 340. These internal threads are the main fastening force-bearing structure.

[0061] In this embodiment, in order to prevent the threaded sleeve 340 from completely falling off and being lost from the third connector 330 during pre-assembly or disassembly, and to facilitate operation, an annular protrusion is provided on the corresponding outer wall of the third connector 330; when the small diameter section of the threaded sleeve 340 is fitted into the third connector 330, this annular protrusion acts as an axial limiting surface; as the threaded sleeve 340 is screwed toward the second connector 320, its end face will eventually abut against the protrusion, thereby effectively restricting the threaded sleeve 340 from continuing to move in the direction of disengaging from the third connector 330.

[0062] In this embodiment, the second connector 320 has an external thread on its outer wall corresponding to the internal thread of the large diameter section of the threaded sleeve 340. When it is necessary to connect the second connector 320 with the third connector 330 that has been assembled with the connecting pipe 300, simply put the threaded sleeve 340 on the third connector 330 first, and then screw the end of the second connector 320 with the external thread into the large diameter section of the threaded sleeve 340. By rotating the threaded sleeve 340 or the second connector 320, the threads of the two are engaged and tightened, thus completing the reliable connection and fastening between the second connector 320 and the third connector 330, and pressing the sealing surface between the two at the same time.

[0063] In a preferred embodiment, the nozzle 200 is further provided with a guide vane 220; the guide vane 220 is located between the nozzle core 210 and the connecting pipe 300.

[0064] In this embodiment, the nozzle 200, as the core component for achieving the final spray pattern, not only includes the nozzle core 210 with swirl groove 211 as described in claim 1, but also adds a guide vane 220 upstream of the nozzle core 210; the guide vane 220 is an independent component fixedly installed in the inner cavity of the nozzle 200.

[0065] In this embodiment, the guide vane 220 is located between the nozzle core 210 and the connecting pipe 300; more specifically, from the perspective of fluid flow direction, the gas-water two-phase flow from the connecting pipe 300, which has undergone preliminary or secondary mixing, first passes through the guide vane 220, and then reaches and enters the swirl groove 211 region of the nozzle core 210.

[0066] In this embodiment, the placement of the guide vane 220 at this position has a clear functional purpose: to adjust and pre-treat the flow of the mixed medium that is about to enter the final atomization formation stage (i.e., the nozzle core swirl groove); the design of the blade shape and angle of the guide vane 220 can guide, distribute and initially allocate the incoming flow; this helps to eliminate any flow inhomogeneity or eddies that may exist in the connecting pipe, ensuring that the mixed medium can enter each swirl groove 211 of the nozzle core 210 with a more stable and uniform flow rate and distribution state, laying a key flow condition foundation for the final formation of a uniform and stable solid cone spray.

[0067] 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 textual 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 tapered solid nozzle for a square-round bloom caster, characterized by, The utility model relates to a kind of cone solid nozzle for square billet continuous casting machine, including Base body (100), the inside of base body (100) is equipped with mixing cavity (110) and the air inlet cavity (120) and liquid inlet cavity (130) respectively with the air inlet cavity (120) and liquid inlet cavity (130) communication; The backflow cavity (140) between liquid inlet cavity (130) and mixing cavity (110) is also equipped with, for increasing water supply back pressure; Spray head (200), the spray head (200) is connected with base body (100) by connecting assembly, and inside is equipped with nozzle core (210); The outer circle of nozzle core (210) is equipped with the even arrangement of rotational flow groove (211) along circumference, forms solid spray structure, for improving atomization uniformity; The number of rotational flow groove (211) is even, and the opposite two rotational flow groove (211) are connected by converging groove; The converging groove is located on the end face of nozzle core (210) away from base body (100) one end; Two ends of connecting assembly are respectively detachably connected with spray head (200) and base body (100), for communicating nozzle core (210) and mixing cavity (110).

2. The cone solid nozzle for square billet continuous casting machine according to claim 1, wherein The air inlet cavity (120) is coaxially arranged with the mixing cavity (110), located at one end of the mixing cavity (110) away from the spray head (200), and a first communication hole is arranged between the air inlet cavity (120) and the mixing cavity (110); The end of the air inlet cavity (120) away from the mixing cavity (110) is an open structure, and an air inlet grille (121) is arranged inside the air inlet cavity (120); The air inlet grille (121) is threadedly connected with the base body (100), and a first interface for connecting with an external air source is arranged at the end of the air inlet grille (121).

3. The cone solid nozzle for square billet continuous casting machine according to claim 1, wherein The end of the liquid inlet cavity (130) away from the spray head (200) is an open structure, and a water inlet grille (131) is arranged inside the liquid inlet cavity (130); The water inlet grille (131) is threadedly connected with the base body (100), and a second interface for connecting with a water supply device is arranged at the end of the water inlet grille (131).

4. The cone solid nozzle for square billet continuous casting machine according to claim 1, wherein The backflow cavity (140) is internally provided with a backflow member (141), and a second communication hole and a third communication hole are arranged at both sides of the backflow member (141); The second communication hole extends along the radial direction of the backflow cavity (140) and is used for communicating with the liquid inlet cavity (130); The third communication hole extends along the radial direction of the backflow cavity (140) and is used for communicating with the mixing cavity (110).

5. The cone solid nozzle for square billet continuous casting machine according to claim 4, wherein The outer diameter of the backflow member (141) matches the inner diameter of the backflow cavity (140), a flow channel groove extending in a serpentine shape along the circumferential direction is arranged on the outer wall of the backflow member (141), and a coaxial flow channel hole is arranged inside the backflow member (141); The starting point of the flow channel groove is connected with the second communication hole, and the ending point of the flow channel groove is connected with the flow channel hole through a fourth communication hole; The flow channel hole is also connected with the third communication hole through a fifth communication hole penetrating through the backflow member (141).

6. The tapered solid nozzle for square billet continuous caster according to claim 5, characterized in that, a detachable gland (142) is further arranged in the backflow cavity (140) for limiting the backflow member (141) from being separated from the backflow cavity (140); the gland (142) is threadedly connected with the base body (100) and further provided with a sealing ring (143) between the gland (142) and the backflow member (141).

7. The tapered solid nozzle for square billet continuous caster according to claim 1, characterized in that, the connecting assembly comprises a first connector (310) connected with the nozzle head (200) and a second connector (320) connected with the base body (100); the first connector (310) and the second connector (320) are connected through a connecting pipe (300) and are respectively detachably connected with the connecting pipe (300).

8. The tapered solid nozzle for square billet continuous caster according to claim 7, characterized in that, one end of the connecting pipe (300) is directly connected with the first connector (310) and the other end is connected with the second connector (320) through a third connector (330); the first connector (310) and the third connector (330) are threadedly connected with the connecting pipe (300); the second connector (320) is connected with the third connector (330) through a threaded sleeve (340).

9. The tapered solid nozzle for square billet continuous caster according to claim 8, characterized in that, the threaded sleeve (340) is of a variable diameter structure, the inner diameter of the small diameter part matches the diameter of the third connector (330) and the inner wall of the large diameter part is provided with internal threads; the third connector (330) is provided with a protrusion in the shape of a ring for limiting the threaded sleeve (340) from being separated from the third connector (330); the second connector (320) is provided with matching external threads corresponding to the internal threads for threadedly connecting with the threaded sleeve (340).

10. The tapered solid nozzle for square billet continuous caster according to claim 9, characterized in that, the nozzle head (200) is further provided with a flow guide vane (220); the flow guide vane (220) is located between the nozzle core (210) and the connecting pipe (300).

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